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authorMark Murray <markm@FreeBSD.org>1999-03-14 17:13:19 +0000
committerMark Murray <markm@FreeBSD.org>1999-03-14 17:13:19 +0000
commit2aef693010b252e8cff0ce46a6ebf15b74c82219 (patch)
tree5c4b2dfe1ca36eeb731956db3380eef1053a2d03
downloadsrc-2aef693010b252e8cff0ce46a6ebf15b74c82219.tar.gz
src-2aef693010b252e8cff0ce46a6ebf15b74c82219.zip
Clean import of TCP-wrappers by Wietse Venema.vendor/tcp_wrappers/7.6
Rest of build to follow.
Notes
Notes: svn path=/vendor/tcp_wrappers/dist/; revision=44743 svn path=/vendor/tcp_wrappers/7.6/; revision=44745; tag=vendor/tcp_wrappers/7.6
-rw-r--r--contrib/tcp_wrappers/BLURB36
-rw-r--r--contrib/tcp_wrappers/Banners.Makefile70
-rw-r--r--contrib/tcp_wrappers/CHANGES451
-rw-r--r--contrib/tcp_wrappers/DISCLAIMER16
-rw-r--r--contrib/tcp_wrappers/Makefile889
-rw-r--r--contrib/tcp_wrappers/README1038
-rw-r--r--contrib/tcp_wrappers/README.IRIX54
-rw-r--r--contrib/tcp_wrappers/README.NIS207
-rw-r--r--contrib/tcp_wrappers/clean_exit.c42
-rw-r--r--contrib/tcp_wrappers/diag.c69
-rw-r--r--contrib/tcp_wrappers/environ.c224
-rw-r--r--contrib/tcp_wrappers/eval.c136
-rw-r--r--contrib/tcp_wrappers/fakelog.c62
-rw-r--r--contrib/tcp_wrappers/fix_options.c109
-rw-r--r--contrib/tcp_wrappers/fromhost.c52
-rw-r--r--contrib/tcp_wrappers/hosts_access.393
-rw-r--r--contrib/tcp_wrappers/hosts_access.5378
-rw-r--r--contrib/tcp_wrappers/hosts_access.c331
-rw-r--r--contrib/tcp_wrappers/hosts_ctl.c38
-rw-r--r--contrib/tcp_wrappers/hosts_options.5172
-rw-r--r--contrib/tcp_wrappers/inetcf.c317
-rw-r--r--contrib/tcp_wrappers/inetcf.h14
-rw-r--r--contrib/tcp_wrappers/misc.c87
-rw-r--r--contrib/tcp_wrappers/miscd.c120
-rw-r--r--contrib/tcp_wrappers/mystdarg.h19
-rw-r--r--contrib/tcp_wrappers/myvsyslog.c33
-rw-r--r--contrib/tcp_wrappers/ncr.c81
-rw-r--r--contrib/tcp_wrappers/options.c621
-rw-r--r--contrib/tcp_wrappers/patchlevel.h3
-rw-r--r--contrib/tcp_wrappers/percent_m.c43
-rw-r--r--contrib/tcp_wrappers/percent_x.c86
-rw-r--r--contrib/tcp_wrappers/printf.ck3
-rw-r--r--contrib/tcp_wrappers/ptx.c103
-rw-r--r--contrib/tcp_wrappers/refuse.c32
-rw-r--r--contrib/tcp_wrappers/rfc931.c165
-rw-r--r--contrib/tcp_wrappers/safe_finger.c196
-rw-r--r--contrib/tcp_wrappers/scaffold.c213
-rw-r--r--contrib/tcp_wrappers/scaffold.h9
-rw-r--r--contrib/tcp_wrappers/setenv.c34
-rw-r--r--contrib/tcp_wrappers/shell_cmd.c92
-rw-r--r--contrib/tcp_wrappers/socket.c235
-rw-r--r--contrib/tcp_wrappers/strcasecmp.c94
-rw-r--r--contrib/tcp_wrappers/tcpd.8178
-rw-r--r--contrib/tcp_wrappers/tcpd.c129
-rw-r--r--contrib/tcp_wrappers/tcpd.h219
-rw-r--r--contrib/tcp_wrappers/tcpdchk.866
-rw-r--r--contrib/tcp_wrappers/tcpdchk.c462
-rw-r--r--contrib/tcp_wrappers/tcpdmatch.898
-rw-r--r--contrib/tcp_wrappers/tcpdmatch.c328
-rw-r--r--contrib/tcp_wrappers/tli-sequent.c193
-rw-r--r--contrib/tcp_wrappers/tli-sequent.h13
-rw-r--r--contrib/tcp_wrappers/tli.c341
-rw-r--r--contrib/tcp_wrappers/try-from.c85
-rw-r--r--contrib/tcp_wrappers/update.c119
-rw-r--r--contrib/tcp_wrappers/vfprintf.c125
-rw-r--r--contrib/tcp_wrappers/workarounds.c308
56 files changed, 9731 insertions, 0 deletions
diff --git a/contrib/tcp_wrappers/BLURB b/contrib/tcp_wrappers/BLURB
new file mode 100644
index 000000000000..69178c1ae253
--- /dev/null
+++ b/contrib/tcp_wrappers/BLURB
@@ -0,0 +1,36 @@
+@(#) BLURB 1.28 97/03/21 19:27:18
+
+With this package you can monitor and filter incoming requests for the
+SYSTAT, FINGER, FTP, TELNET, RLOGIN, RSH, EXEC, TFTP, TALK, and other
+network services.
+
+The package provides tiny daemon wrapper programs that can be installed
+without any changes to existing software or to existing configuration
+files. The wrappers report the name of the client host and of the
+requested service; the wrappers do not exchange information with the
+client or server applications, and impose no overhead on the actual
+conversation between the client and server applications.
+
+This patch upgrades the tcp wrappers version 7.5 source code to
+version 7.6. The source-routing protection in version 7.5 was not
+as strong as it could be. And all this effort was not needed with
+modern UNIX systems that can already stop source-routed traffic in
+the kernel. Examples are 4.4BSD derivatives, Solaris 2.x, and Linux.
+
+This release does not introduce new features. Do not bother applying
+this patch when you built your version 7.x tcp wrapper without
+enabling the KILL_IP_OPTIONS compiler switch; when you can disable
+IP source routing options in the kernel; when you run a UNIX version
+that pre-dates 4.4BSD, such as SunOS 4. Such systems are unable to
+receive source-routed connections and are therefore not vulnerable
+to IP spoofing attacks with source-routed TCP connections.
+
+A complete change log is given in the CHANGES document. As always,
+problem reports and suggestions for improvement are welcome.
+
+ Wietse Venema (wietse@wzv.win.tue.nl),
+ Department of Mathematics and Computing Science,
+ Eindhoven University of Technology,
+ The Netherlands.
+
+ Currently visiting IBM T.J. Watson Research, Hawthorne NY, USA.
diff --git a/contrib/tcp_wrappers/Banners.Makefile b/contrib/tcp_wrappers/Banners.Makefile
new file mode 100644
index 000000000000..915e3dd96774
--- /dev/null
+++ b/contrib/tcp_wrappers/Banners.Makefile
@@ -0,0 +1,70 @@
+# @(#) Banners.Makefile 1.3 97/02/12 02:13:18
+#
+# Install this file as the Makefile in your directory with banner files.
+# It will convert a prototype banner text to a form that is suitable for
+# the ftp, telnet, rlogin, and other services.
+#
+# You'll have to comment out the IN definition below if your daemon
+# names don't start with `in.'.
+#
+# The prototype text should live in the banners directory, as a file with
+# the name "prototype". In the prototype text you can use %<character>
+# sequences as described in the hosts_access.5 manual page (`nroff -man'
+# format). The sequences will be expanded while the banner message is
+# sent to the client. For example:
+#
+# Hello %u@%h, what brings you here?
+#
+# Expands to: Hello username@hostname, what brings you here? Note: the
+# use of %u forces a client username lookup.
+#
+# In order to use banners, build the tcp wrapper with -DPROCESS_OPTIONS
+# and use hosts.allow rules like this:
+#
+# daemons ... : clients ... : banners /some/directory ...
+#
+# Of course, nothing prevents you from using multiple banner directories.
+# For example, one banner directory for clients that are granted service,
+# one banner directory for rejected clients, and one banner directory for
+# clients with a hostname problem.
+#
+SHELL = /bin/sh
+IN = in.
+BANNERS = $(IN)telnetd $(IN)ftpd $(IN)rlogind # $(IN)fingerd $(IN)rshd
+
+all: $(BANNERS)
+
+$(IN)telnetd: prototype
+ cp prototype $@
+ chmod 644 $@
+
+$(IN)ftpd: prototype
+ sed 's/^/220-/' prototype > $@
+ chmod 644 $@
+
+$(IN)rlogind: prototype nul
+ ( ./nul ; cat prototype ) > $@
+ chmod 644 $@
+
+# Other services: banners may interfere with normal operation
+# so they should probably be used only when refusing service.
+# In particular, banners don't work with standard rsh daemons.
+# You would have to use an rshd that has built-in tcp wrapper
+# support, for example the rshd that is part of the logdaemon
+# utilities.
+
+$(IN)fingerd: prototype
+ cp prototype $@
+ chmod 644 $@
+
+$(IN)rshd: prototype nul
+ ( ./nul ; cat prototype ) > $@
+ chmod 644 $@
+
+# In case no /dev/zero available, let's hope they have at least
+# a C compiler of some sort.
+
+nul:
+ echo 'main() { write(1,"",1); return(0); }' >nul.c
+ $(CC) $(CFLAGS) -s -o nul nul.c
+ rm -f nul.c
diff --git a/contrib/tcp_wrappers/CHANGES b/contrib/tcp_wrappers/CHANGES
new file mode 100644
index 000000000000..e68ee750e015
--- /dev/null
+++ b/contrib/tcp_wrappers/CHANGES
@@ -0,0 +1,451 @@
+Request: after building the programs, please run the `tcpdchk' wrapper
+configuration checker. See the `tcpdchk.8' manual page (`nroff -man'
+format) for instructions. `tcpdchk' automatically identifies the most
+common configuration problems, and will save you and me a lot of time.
+
+Changes per release 7.6 (Mar 1997)
+==================================
+
+- Improved the anti source-routing protection. The code in version
+7.5 was not as strong as it could be, because I tried to be compatible
+with Linux. That was a mistake. Sorry for the inconvenience.
+
+- The program no longer terminates case of a source-routed connection,
+making the IP-spoofing code more usable for long-running daemons.
+
+- When syslogging DNS hostname problems, always stop after a limited
+number of characters.
+
+Changes per release 7.5 (Feb 1997)
+==================================
+
+- Optionally refuse source-routed TCP connections requests altogether.
+Credits to Niels Provos of Universitaet Hamburg. File: fix_options.c.
+
+- Support for IRIX 6 (Lael Tucker).
+
+- Support for Amdahl UTS 2.1.5 (Richard E. Richmond).
+
+- Support for SINIX 5.42 (Klaus Nielsen).
+
+- SCO 5 now has vsyslog() (Bill Golden).
+
+- Hints and tips for dealing with IRIX inetd (Niko Makila, Aaron
+M Lee).
+
+- Support for BSD/OS (Paul Borman).
+
+- Support for Tandem (Emad Qawas).
+
+- Support for ISC (Frederick B. Cohen).
+
+- Workaround for UNICOS - it would choke on a setjmp() expression
+(Bruce Kelly). File: hosts_access.c, tcpdchk.c.
+
+- Increased the level of buffer overflow paranoia when printing
+unwanted IP options. File: fix_options.c.
+
+Changes per release 7.4 (Mar 1996)
+==================================
+
+- IRIX 5.3 (and possibly, earlier releases, too) library routines call
+the non-reentrant strtok() routine. The result is that hosts may slip
+through allow/deny filters. Workaround is to not rely on the vendor's
+strtok() routine (#ifdef LIBC_CALLS_STRTOK). Credits to Th. Eifert
+(Aachen University) for spotting this one. This fix supersedes the
+earlier workaround for a similar problem in FreeBSD 2.0.
+
+Changes per release 7.3 (Feb 1996)
+==================================
+
+- More tests added to tcpdchk and tcpdmatch: make sure that the
+REAL_DAEMON_DIR actually is a directory and not a regular file;
+detect if tcpd recursively calls itself.
+
+- Edwin Kremer found an amusing fencepost error in the xgets()
+routine: lines longer than BUFLEN characters would be garbled.
+
+- The access control routines now refuse to execute "dangerous" actions
+such as `twist' when they are called from within a resident process.
+This prevents you from shooting yourself into the foot with critical
+systems programs such as, e.g., portmap or rpcbind.
+
+- Support for Unicos 8.x (Bruce Kelly). The program now closes the
+syslog client socket before running the real daemon: Cray UNICOS
+refuses to checkpoint processes with open network ports.
+
+- Support for MachTen UNIX (Albert M.C Tam).
+
+- Support for Interactive UNIX R3.2 V4.0 (Bobby D. Wright).
+
+- Support for SCO 3.2v5.0.0 OpenServer 5 (bob@odt.handy.com)
+
+- Support for Unixware 1.x and Unixware 2.x. The old Unixware Makefile
+rule was broken. Sorry about that.
+
+- Some FreeBSD 2.0 libc routines call strtok() and severely mess up the
+allow/deny rule processing. This is very bad. Workaround: call our own
+strtok() clone (#ifdef USE_STRSEP).
+
+- The programs now log a warning when they detect that a non-existent
+banner directory is specified.
+
+- The hosts_access.3 manual page used obsolete names for the RQ_*
+constants.
+
+Changes per release 7.2 (Jan 1995)
+==================================
+
+- Added a note to the README and manpages on using the IDENT service to
+detect sequence number spoofing and other host impersonation attacks.
+
+- Portability: ConvexOS puts RPC version numbers before the daemon path
+name (Jukka Ukkonen).
+
+- Portability: the AIX compiler disliked the strchr() declaration
+in socket.c. I should have removed it when I included <string.h>.
+
+- Backwards compatibility: some people relied on the old leading dot or
+trailing dot magic in daemon process names.
+
+- Backwards compatibility: hostname lookup remains enabled when
+-DPARANOID is turned off. In order to disable hostname lookups you
+must turn off -DALWAYS_HOSTNAME.
+
+- Eliminated false complaints from the tcpdmatch/tcpdchk configuration
+checking programs about process names not in inetd.conf or about KNOWN
+username patterns.
+
+Changes per release 7.1 (Jan 1995)
+==================================
+
+- Portability: HP-UX permits you to break inetd.conf entries with
+backslash-newline.
+
+- Portability: EP/IX has no putenv() and some inetd.conf entries are
+spread out over two lines.
+
+- Portability: SCO with NIS support has no *netgrent() routines.
+
+Changes per release 7.0 (Jan 1995)
+==================================
+
+- Added a last-minute workaround for a Solaris 2.4 gethostbyname()
+foulup with multi-homed hosts in DNS through NIS mode.
+
+- Added a last-minute defense against TLI weirdness: address lookups
+apparently succeed but the result netbuf is empty (ticlts transport).
+
+- Dropped several new solutions that were in need of a problem. Beta
+testers may recognize what new features were kicked out during the last
+weeks before release 7.0 came out. Such is life.
+
+- Got rid of out the environment replacement routines, at least for
+most architectures. One should not have to replace working system
+software when all that is needed is a 4.4BSD setenv() emulator.
+
+- By popular request I have added an option to send banner messages to
+clients. There is a Banners.Makefile that gives some aid for sites that
+are going to use this feature. John C. Wingenbach did some pioneering
+work here. I used to think that banners are frivolous. Now that I had
+a personal need for them I know that banners can be useful.
+
+- At last: an extensible functional interface to the pattern matching
+engine. request_init() and request_set() accept a variable-length
+name-value argument list. The result can be passed to hosts_access().
+
+- When PARANOID mode is disabled (compile time), the wrapper does no
+hostname lookup or hostname double checks unless required by %letter
+expansions, or by access control rules that match host names. This is
+useful for sites that don't care about internet hostnames anyway.
+Inspired by the authors of the firewalls and internet security book.
+
+- When PARANOID mode is disabled (compile time), hosts with a name/name
+or name/address conflict can be matched with the PARANOID host wildcard
+pattern, so that you can take some intelligent action instead of just
+dropping clients. Like showing a banner that explains the problem.
+
+- New percent escapes: %A expands to the server address; %H expands to
+the corresponding hostname (or address if no name is available); %n and
+%N expand to the client and server hostname (or "unknown"); %s expands
+to everything we know about the server endpoint (the opposite of the %c
+sequence for client information).
+
+- Symmetry: server and client host information is now treated on equal
+footing, so that we can reuse a lot of code.
+
+- Lazy evaluation of host names, host addresses, usernames, and so on,
+to avoid doing unnecessary work.
+
+- Dropping #ifdefs for some archaic systems made the code simpler.
+
+- Dropping the FAIL pattern made the pattern matcher much simpler. Run
+the "tcpdchk" program to scan your access control files for any uses of
+this obscure language feature.
+
+- Moving host-specific pattern matching from string_match() to the
+host_match() routine made the code more accurate. Run the "tcpdchk"
+program to scan your access control files for any dependencies on
+undocumented or obscure language features that are gone.
+
+- daemon@host patterns trigger on clients that connect to a specific
+internet address. This can be useful for service providers that offer
+multiple ftp or www archives on different internet addresses, all
+belonging to one and the same host (www.foo.com, ftp.bar.com, you get
+the idea). Inspired by a discussion with Rop Gonggrijp, Cor Bosman,
+and Casper Dik, and earlier discussions with Adrian van Bloois.
+
+- The new "tcpdchk" program critcizes all your access control rules and
+inetd.conf entries. Great for spotting obscure bugs in my own hosts.xxx
+files. This program also detects hosts with name/address conflicts and
+with other DNS-related problems. See the "tcpdchk.8" manual page.
+
+- The "tcpdmatch" program replaces the poor old "try" command. The new
+program looks in your inetd.conf file and therefore produces much more
+accurate predictions. In addition, it detects hosts with name/address
+conflicts and with other DNS-related problems. See the "tcpdmatch.8"
+manual page. The inetd.conf lookup was suggested by Everett F Batey.
+
+- In the access control tables, the `=' between option name and value
+is no longer required.
+
+- Added 60-second timeout to the safe_finger command, to cover another
+potential problem. Suggested by Peter Wemm.
+
+- Andrew Maffei provided code that works with WIN-TCP on NCR System V.4
+UNIX. It reportedly works with versions 02.02.01 and 02.03.00. The code
+pops off all streams modules above the device driver, pushes the timod
+module to get at the peer address, and then restores the streams stack
+to the initial state.
+
+Changes per release 6.3 (Mar 1994)
+==================================
+
+- Keepalives option, to get rid of stuck daemons when people turn off
+their PC while still connected. Files: options.c, hosts_options.5.
+
+- Nice option, to calm down network daemons that take away too much CPU
+time. Files: options.c, hosts_options.5.
+
+- Ultrix perversion: the environ global pointer may be null. The
+environment replacement routines now check for this. File: environ.c.
+
+- Fixed a few places that still assumed the socket is on standard
+input. Fixed some error messages that did not provide access control
+file name and line number. File: options.c.
+
+- Just when I was going to release 6.2 I received code for Dynix/PTX.
+That code is specific to PTX 2.x, so I'll keep around my generic
+PTX code just in case. The difference is in the handling of UDP
+services. Files: tli_sequent.[hc].
+
+Changes per release 6.2 (Feb 1994)
+==================================
+
+- Resurrected my year-old code to reduce DNS load by appending a dot to
+the gethostbyname() argument. This feature is still experimental and it
+may go away if it causes more problems than it solves. File: socket.c.
+
+- Auxiliary code for the Pyramid, BSD universe. Karl Vogel figured out
+what was missing: yp_get_default_domain() and vfprintf(). Files:
+workarounds.c, vfprintf.c.
+
+- Improved support for Dynix/PTX. The wrapper should now be able to
+deal with all TLI over IP services. File: ptx.c.
+
+- The try command now uses the hostname that gethostbyaddr() would
+return, instead of the hostname returned by gethostbyname(). This can
+be significant on systems with NIS that have short host names in the
+hosts map. For example, gethostbyname("wzv.win.tue.nl") returns
+"wzv.win.tue.nl"; gethostbyaddr(131.155.210.17) returns "wzv", and
+that is what we should test with. File: try.c.
+
+Changes per release 6.1 (Dec 1993)
+==================================
+
+- Re-implemented all environment access routines. Most systems have
+putenv() but no setenv(), some systems have setenv() but no putenv(),
+and there are even systems that have neither setenv() nor putenv(). The
+benefit of all this is that more systems can now be treated in the same
+way. File: environ.c.
+
+- Workaround for a weird problem with DG/UX when the wrapper is run as
+nobody (i.e. fingerd). For some reason the ioctl(fd, I_FIND, "sockmod")
+call fails even with socket-based applications. The "fix" is to always
+assume sockets when the ioctl(fd, I_FIND, "timod") call fails. File:
+fromhost.c. Thanks to Paul de Vries (vries@dutentb.et.tudelft.nl) for
+helping me to figure out this one.
+
+- Implemented a workaround for Dynix/PTX and other systems with TLI
+that lack some essential support routines. Thanks to Bugs Brouillard
+(brouill@hsuseq.humboldt.edu) for the hospitality to try things out.
+The trick is to temporarily switch to the socket API to identify the
+client, and to switch back to TLI when done. It still does not work
+right for basic network services such as telnet. File: fromhost.c.
+
+- Easy-to-build procedures for SCO UNIX, ConvexOS with UltraNet, EP/IX,
+Dynix 3.2, Dynix/PTX. File: Makefile.
+
+- Variable rfc931 timeout. Files: rfc931.c, options.c, log_tcp.h, try.c.
+
+- Further simplification of the rfc931 code. File: rfc931.c.
+
+- The fromhost() interface stinks: I cannot change that, but at least
+the from_sock() and from_tli() functions now accept a file descriptor
+argument.
+
+- Fixed a buglet: fromhost() would pass a garbage file descriptor to
+the isastream() call.
+
+- On some systems the finger client program lives in /usr/bsd. File:
+safe_finger.c.
+
+Changes per release 6.0 (Sept 1993)
+===================================
+
+- Easy build procedures for common platforms (sun, ultrix, aix, hpux
+and others).
+
+- TLI support, System V.4 style (Solaris, DG/UX).
+
+- Username lookup integrated with the access control language.
+Selective username lookups are now the default (was: no username
+lookups).
+
+- A safer finger command for booby traps. This one solves a host of
+possible problems with automatic reverse fingers. Thanks, Borja Marcos
+(borjam@we.lc.ehu.es) for some inspiring discussions.
+
+- KNOWN pattern that matches hosts whose name and address are known.
+
+- Cleanup of diagnostics. Errors in access-control files are now shown
+with file name and line number.
+
+- With AIX 3.2, hostnames longer than 32 would be truncated. This
+caused hostname verification failures, so that service would be refused
+when paranoid mode was enabled. Found by: Adrian van Bloois
+(A.vanBloois@info.nic.surfnet.nl).
+
+- With some IRIX versions, remote username lookups failed because the
+fgets() library function does not handle partial read()s from sockets.
+Found by: Daniel O'Callaghan (danny@austin.unimelb.edu.au).
+
+- Added a DISCLAIMER document to help you satisfy legal departments.
+
+The extension language module has undergone major revisions and
+extensions. Thanks, John P. Rouillard (rouilj@ra.cs.umb.edu) for
+discussions, experiments, and for being a good guinea pig. The
+extensions are documented in hosts_options.5, and are enabled by
+editing the Makefile STYLE macro definition.
+
+- (Extension language) The ":" separator may now occur within options
+as long as it is protected with a backslash. A warning is issued when
+a rule ends on ":".
+
+- (Extension language) Better verification mode. When the `try' command
+is run, each option function now explains what it would do.
+
+- (Extension language) New "allow" and "deny" keywords so you can now
+have all rules within a single file. See "nroff -man hosts_options.5"
+for examples.
+
+- (Extension language) "linger" keyword to set the socket linger time
+(SO_LINGER). From: Marc Boucher <marc@cam.org>.
+
+- (Extension language) "severity" keyword to turn the logging noise up
+or down. Many sites wanted a means to shut up the program; other sites
+wanted to emphasize specific events. Adapted from code contributed
+by Dave Mitchell <D.Mitchell@dcs.shef.ac.uk>.
+
+Changes per release 5.1 (Mar 1993)
+==================================
+
+- The additional protection against source-routing attacks from hosts
+that pretend to have someone elses network address has become optional
+because it causes kernel panics with SunOS <= 4.1.3.
+
+Changes per release 5.0 (Mar 1993)
+==================================
+
+- Additional protection against source-routing attacks from hosts that
+pretend to have someone elses network address. For example, the address
+of a trusted host within your own network.
+
+- The access control language has been extended with a simple but
+powerful operator that greatly simplifies the design of rule sets (ALL:
+.foo.edu EXCEPT dialup.foo.edu). Blank lines are permitted, and long
+lines can be continued with backslash-newline.
+
+- All configurable stuff, including path names, has been moved into the
+Makefile so that you no longer have to hack source code to just
+configure the programs.
+
+- Ported to Solaris 2. TLI-based applications not yet supported.
+Several workarounds for System V bugs.
+
+- A small loophole in the netgroup lookup code was closed, and the
+remote username lookup code was made more portable.
+
+- Still more documentation. The README file now provides tutorial
+sections with introductions to client, server, inetd and syslogd.
+
+Changes per release 4.3 (Aug 1992)
+==================================
+
+- Some sites reported that connections would be rejected because
+localhost != localhost.domain. The host name checking code now
+special-cases localhost (problem reported by several sites).
+
+- The programs now report an error if an existing access control file
+cannot be opened (e.g. due to lack of privileges). Until now, the
+programs would just pretend that the access control file does not exist
+(reported by Darren Reed, avalon@coombs.anu.edu.au).
+
+- The timeout period for remote userid lookups was upped to 30 seconds,
+in order to cope with slow hosts or networks. If this is too long for
+you, adjust the TIMEOUT definition in file rfc931.c (problem reported
+by several sites).
+
+- On hosts with more than one IP network interface, remote userid
+lookups could use the IP address of the "wrong" local interface. The
+problem and its solution were discussed on the rfc931-users mailing
+list. Scott Schwartz (schwartz@cs.psu.edu) folded the fix into the
+rfc931.c module.
+
+- The result of % expansion (in shell commands) is now checked for
+stuff that may confuse the shell; it is replaced by underscores
+(problem reported by Icarus Sparry, I.Sparry@gdr.bath.ac.uk).
+
+- A portability problem was fixed that caused compile-time problems
+on a CRAY (problem reported by Michael Barnett, mikeb@rmit.edu.au).
+
+Changes per release 4.0 (Jun 1992)
+==================================
+
+1 - network daemons no longer have to live within a common directory
+2 - the access control code now uses both the host address and name
+3 - an access control pattern that supports netmasks
+4 - additional protection against forged host names
+5 - a pattern that matches hosts whose name or address lookup fails
+6 - an operator that prevents hosts or services from being matched
+7 - optional remote username lookup with the RFC 931 protocol
+8 - an optional umask to prevent the creation of world-writable files
+9 - hooks for access control language extensions
+10 - last but not least, thoroughly revised documentation.
+
+Changes per release 3.0 (Oct 1991)
+==================================
+
+Enhancements over the previous release are: support for datagram (UDP
+and RPC) services, and execution of shell commands when a (remote host,
+requested service) pair matches a pattern in the access control tables.
+
+Changes per release 2.0 (May 1991)
+==================================
+
+Enhancements over the previous release are: protection against rlogin
+and rsh attacks through compromised domain name servers, optional
+netgroup support for systems with NIS (formerly YP), and an extension
+of the wild card patterns supported by the access control files.
+
+Release 1.0 (Jan 1991)
diff --git a/contrib/tcp_wrappers/DISCLAIMER b/contrib/tcp_wrappers/DISCLAIMER
new file mode 100644
index 000000000000..42d82ca77504
--- /dev/null
+++ b/contrib/tcp_wrappers/DISCLAIMER
@@ -0,0 +1,16 @@
+/************************************************************************
+* Copyright 1995 by Wietse Venema. All rights reserved. Some individual
+* files may be covered by other copyrights.
+*
+* This material was originally written and compiled by Wietse Venema at
+* Eindhoven University of Technology, The Netherlands, in 1990, 1991,
+* 1992, 1993, 1994 and 1995.
+*
+* Redistribution and use in source and binary forms are permitted
+* provided that this entire copyright notice is duplicated in all such
+* copies.
+*
+* This software is provided "as is" and without any expressed or implied
+* warranties, including, without limitation, the implied warranties of
+* merchantibility and fitness for any particular purpose.
+************************************************************************/
diff --git a/contrib/tcp_wrappers/Makefile b/contrib/tcp_wrappers/Makefile
new file mode 100644
index 000000000000..2906c52ddf37
--- /dev/null
+++ b/contrib/tcp_wrappers/Makefile
@@ -0,0 +1,889 @@
+# @(#) Makefile 1.23 97/03/21 19:27:20
+
+what:
+ @echo
+ @echo "Usage: edit the REAL_DAEMON_DIR definition in the Makefile then:"
+ @echo
+ @echo " make sys-type"
+ @echo
+ @echo "If you are in a hurry you can try instead:"
+ @echo
+ @echo " make REAL_DAEMON_DIR=/foo/bar sys-type"
+ @echo
+ @echo "And for a version with language extensions enabled:"
+ @echo
+ @echo " make REAL_DAEMON_DIR=/foo/bar STYLE=-DPROCESS_OPTIONS sys-type"
+ @echo
+ @echo "This Makefile knows about the following sys-types:"
+ @echo
+ @echo " generic (most bsd-ish systems with sys5 compatibility)"
+ @echo " 386bsd aix alpha apollo bsdos convex-ultranet dell-gcc dgux dgux543"
+ @echo " dynix epix esix freebsd hpux irix4 irix5 irix6 isc iunix"
+ @echo " linux machten mips(untested) ncrsvr4 netbsd next osf power_unix_211"
+ @echo " ptx-2.x ptx-generic pyramid sco sco-nis sco-od2 sco-os5 sinix sunos4"
+ @echo " sunos40 sunos5 sysv4 tandem ultrix unicos7 unicos8 unixware1 unixware2"
+ @echo " uts215 uxp"
+ @echo
+ @echo "If none of these match your environment, edit the system"
+ @echo "dependencies sections in the Makefile and do a 'make other'."
+ @echo
+
+#######################################################
+# Choice between easy and advanced installation recipe.
+#
+# Advanced installation: vendor-provided daemons are left alone, and the
+# inetd configuration file is edited. In this case, the REAL_DAEMON_DIR
+# macro should reflect the actual directory with (most of) your
+# vendor-provided network daemons. These names can be found in the
+# inetd.conf file. Usually, the telnet, ftp and finger daemons all live
+# in the same directory.
+#
+# Uncomment the appropriate line if you are going to edit inetd.conf.
+#
+# Ultrix 4.x SunOS 4.x ConvexOS 10.x Dynix/ptx
+#REAL_DAEMON_DIR=/usr/etc
+#
+# SysV.4 Solaris 2.x OSF AIX
+#REAL_DAEMON_DIR=/usr/sbin
+#
+# BSD 4.4
+#REAL_DAEMON_DIR=/usr/libexec
+#
+# HP-UX SCO Unicos
+#REAL_DAEMON_DIR=/etc
+
+# Easy installation: vendor-provided network daemons are moved to "some
+# other" directory, and the tcpd wrapper fills in the "holes". For this
+# mode of operation, the REAL_DAEMON_DIR macro should be set to the "some
+# other" directory. The "..." is here for historical reasons only; you
+# should probably use some other name.
+#
+# Uncomment the appropriate line if you are going to move your daemons.
+#
+# Ultrix 4.x SunOS 4.x ConvexOS 10.x Dynix/ptx
+#REAL_DAEMON_DIR=/usr/etc/...
+#
+# SysV.4 Solaris 2.x OSF AIX
+#REAL_DAEMON_DIR=/usr/sbin/...
+#
+# BSD 4.4
+#REAL_DAEMON_DIR=/usr/libexec/...
+#
+# HP-UX SCO Unicos
+#REAL_DAEMON_DIR=/etc/...
+
+# End of mandatory section
+##########################
+
+##########################################
+# Ready-to-use system-dependent templates.
+#
+# Ready-to-use templates are available for many systems (see the "echo"
+# commands at the start of this Makefile). The templates take care of
+# all system dependencies: after editing the REAL_DAEMON_DIR definition
+# above, do a "make sunos4" (or whatever system type is appropriate).
+#
+# If your system is not listed (or something that comes close enough), you
+# have to edit the system dependencies section below and do a "make other".
+#
+# Send templates for other UNIX versions to wietse@wzv.win.tue.nl.
+
+# This is good for many BSD+SYSV hybrids with NIS (formerly YP).
+generic aix osf alpha dynix:
+ @make REAL_DAEMON_DIR=$(REAL_DAEMON_DIR) STYLE=$(STYLE) \
+ LIBS= RANLIB=ranlib ARFLAGS=rv AUX_OBJ=setenv.o \
+ NETGROUP=-DNETGROUP TLI= all
+
+# Ditto, with vsyslog
+sunos4:
+ @make REAL_DAEMON_DIR=$(REAL_DAEMON_DIR) STYLE=$(STYLE) \
+ LIBS= RANLIB=ranlib ARFLAGS=rv AUX_OBJ=setenv.o \
+ NETGROUP=-DNETGROUP VSYSLOG= TLI= all
+
+# Generic with resolver library.
+generic-resolver:
+ @make REAL_DAEMON_DIR=$(REAL_DAEMON_DIR) STYLE=$(STYLE) \
+ LIBS=-lresolv RANLIB=ranlib ARFLAGS=rv AUX_OBJ=setenv.o \
+ NETGROUP=-DNETGROUP TLI= all
+
+# The NeXT loader needs "-m" or it barfs on redefined library functions.
+next:
+ @make REAL_DAEMON_DIR=$(REAL_DAEMON_DIR) STYLE=$(STYLE) \
+ LIBS=-m RANLIB=ranlib ARFLAGS=rv AUX_OBJ=environ.o \
+ NETGROUP=-DNETGROUP TLI= all
+
+# SunOS for the 386 was frozen at release 4.0.x.
+sunos40:
+ @make REAL_DAEMON_DIR=$(REAL_DAEMON_DIR) STYLE=$(STYLE) \
+ LIBS= RANLIB=ranlib ARFLAGS=rv AUX_OBJ="setenv.o strcasecmp.o" \
+ NETGROUP=-DNETGROUP VSYSLOG= TLI= all
+
+# Ultrix is like aix, next, etc., but has miscd and setenv().
+ultrix:
+ @make REAL_DAEMON_DIR=$(REAL_DAEMON_DIR) STYLE=$(STYLE) \
+ LIBS= RANLIB=ranlib ARFLAGS=rv AUX_OBJ= \
+ NETGROUP=-DNETGROUP TLI= all miscd
+
+# This works on EP/IX 1.4.3 and will likely work on Mips (reggers@julian.uwo.ca)
+epix:
+ @make REAL_DAEMON_DIR=$(REAL_DAEMON_DIR) STYLE=$(STYLE) \
+ LIBS= RANLIB=ranlib ARFLAGS=rv AUX_OBJ=environ.o \
+ NETGROUP=-DNETGROUP TLI= SYSTYPE="-systype bsd43" all
+
+# Freebsd and linux by default have no NIS.
+386bsd netbsd bsdos:
+ @make REAL_DAEMON_DIR=$(REAL_DAEMON_DIR) STYLE=$(STYLE) \
+ LIBS= RANLIB=ranlib ARFLAGS=rv AUX_OBJ= NETGROUP= TLI= \
+ EXTRA_CFLAGS=-DSYS_ERRLIST_DEFINED VSYSLOG= all
+
+freebsd:
+ @make REAL_DAEMON_DIR=$(REAL_DAEMON_DIR) STYLE=$(STYLE) \
+ LIBS= RANLIB=ranlib ARFLAGS=rv AUX_OBJ= NETGROUP= TLI= \
+ EXTRA_CFLAGS=-DSYS_ERRLIST_DEFINED VSYSLOG= all
+
+linux:
+ @make REAL_DAEMON_DIR=$(REAL_DAEMON_DIR) STYLE=$(STYLE) \
+ LIBS= RANLIB=ranlib ARFLAGS=rv AUX_OBJ=setenv.o \
+ NETGROUP= TLI= EXTRA_CFLAGS="-DBROKEN_SO_LINGER" all
+
+# This is good for many SYSV+BSD hybrids with NIS, probably also for HP-UX 7.x.
+hpux hpux8 hpux9 hpux10:
+ @make REAL_DAEMON_DIR=$(REAL_DAEMON_DIR) STYLE=$(STYLE) \
+ LIBS= RANLIB=echo ARFLAGS=rv AUX_OBJ=setenv.o \
+ NETGROUP=-DNETGROUP TLI= all
+
+# ConvexOS-10.x with UltraNet support (ukkonen@csc.fi).
+convex-ultranet:
+ @make REAL_DAEMON_DIR=$(REAL_DAEMON_DIR) STYLE=$(STYLE) \
+ LIBS=-lulsock RANLIB=ranlib ARFLAGS=rv AUX_OBJ=environ.o \
+ NETGROUP=-DNETGROUP TLI= all
+
+# Generic support for the Dynix/PTX version of TLI.
+ptx-generic:
+ @make REAL_DAEMON_DIR=$(REAL_DAEMON_DIR) STYLE=$(STYLE) \
+ LIBS="-lsocket -linet -lnsl" RANLIB=echo ARFLAGS=rv \
+ AUX_OBJ="setenv.o strcasecmp.o ptx.o" NETGROUP= TLI=-DPTX all
+
+# With UDP support optimized for PTX 2.x (timw@sequent.com).
+ptx-2.x:
+ @make REAL_DAEMON_DIR=$(REAL_DAEMON_DIR) STYLE=$(STYLE) \
+ LIBS="-lsocket -linet -lnsl" RANLIB=echo ARFLAGS=rv \
+ AUX_OBJ="setenv.o strcasecmp.o tli-sequent.o" NETGROUP= \
+ TLI=-DTLI_SEQUENT all
+
+# IRIX 4.0.x has a special ar(1) flag.
+irix4:
+ @make REAL_DAEMON_DIR=$(REAL_DAEMON_DIR) STYLE=$(STYLE) \
+ LIBS="-lc -lsun" RANLIB=echo ARFLAGS=rvs AUX_OBJ=setenv.o \
+ NETGROUP=-DNETGROUP TLI= all
+
+# IRIX 5.2 is SYSV4 with several broken things (such as -lsocket -lnsl).
+irix5:
+ @make REAL_DAEMON_DIR=$(REAL_DAEMON_DIR) STYLE=$(STYLE) \
+ LIBS=-lsun RANLIB=echo ARFLAGS=rv VSYSLOG= \
+ NETGROUP=-DNETGROUP AUX_OBJ=setenv.o TLI= all
+
+# IRIX 6.2 (tucker@math.unc.edu). Must find a better value than 200000.
+irix6:
+ @make REAL_DAEMON_DIR=$(REAL_DAEMON_DIR) STYLE=$(STYLE) \
+ LIBS= RANLIB=echo ARFLAGS=rv VSYSLOG= \
+ NETGROUP=-DNETGROUP EXTRA_CFLAGS="-DBSD=200000" TLI= all
+
+# SunOS 5.x is another SYSV4 variant.
+sunos5:
+ @make REAL_DAEMON_DIR=$(REAL_DAEMON_DIR) STYLE=$(STYLE) \
+ LIBS="-lsocket -lnsl" RANLIB=echo ARFLAGS=rv VSYSLOG= \
+ NETGROUP=-DNETGROUP AUX_OBJ=setenv.o TLI=-DTLI \
+ BUGS="$(BUGS) -DSOLARIS_24_GETHOSTBYNAME_BUG" all
+
+# Generic SYSV40
+esix sysv4:
+ @make REAL_DAEMON_DIR=$(REAL_DAEMON_DIR) STYLE=$(STYLE) \
+ LIBS="-lsocket -lnsl" RANLIB=echo ARFLAGS=rv \
+ NETGROUP=-DNETGROUP AUX_OBJ=setenv.o TLI=-DTLI all
+
+# DG/UX 5.4.1 and 5.4.2 have an unusual inet_addr() interface.
+dgux:
+ @make REAL_DAEMON_DIR=$(REAL_DAEMON_DIR) STYLE=$(STYLE) \
+ LIBS=-lnsl RANLIB=echo ARFLAGS=rv \
+ NETGROUP=-DNETGROUP AUX_OBJ=setenv.o TLI=-DTLI \
+ BUGS="$(BUGS) -DINET_ADDR_BUG" all
+
+dgux543:
+ @make REAL_DAEMON_DIR=$(REAL_DAEMON_DIR) STYLE=$(STYLE) \
+ LIBS=-lnsl RANLIB=echo ARFLAGS=rv \
+ NETGROUP=-DNETGROUP AUX_OBJ=setenv.o TLI=-DTLI all
+
+# NCR UNIX 02.02.01 and 02.03.00 (Alex Chircop, msu@unimt.mt)
+ncrsvr4:
+ @make REAL_DAEMON_DIR=$(REAL_DAEMON_DIR) STYLE=$(STYLE) \
+ LIBS="-lresolv -lnsl -lsocket" RANLIB=echo ARFLAGS=rv \
+ AUX_OBJ="setenv.o strcasecmp.o" NETGROUP= TLI=-DTLI \
+ EXTRA_CFLAGS="" FROM_OBJ=ncr.o all
+
+# Tandem SYSV4 (eqawas@hedgehog.ac.cowan.edu.au)
+tandem:
+ @make REAL_DAEMON_DIR=$(REAL_DAEMON_DIR) STYLE=$(STYLE) \
+ LIBS="-lsocket -lnsl" RANLIB=echo ARFLAGS=rv \
+ NETGROUP= AUX_OBJ="setenv.o strcasecmp.o" TLI=-DTLI all
+
+# Amdahl UTS 2.1.5 (Richard.Richmond@bridge.bst.bls.com)
+uts215:
+ @make REAL_DAEMON_DIR=$(REAL_DAEMON_DIR) STYLE=$(STYLE) \
+ LIBS="-lsocket" RANLIB=echo \
+ ARFLAGS=rv AUX_OBJ=setenv.o NETGROUP=-DNO_NETGROUP TLI= all
+
+# UXP/DS System V.4 clone (vic@uida0.uida.es).
+uxp:
+ @make REAL_DAEMON_DIR=$(REAL_DAEMON_DIR) STYLE=$(STYLE) \
+ LIBS="-L/usr/ucblib -lsocket -lnsl -lucb" \
+ RANLIB=echo ARFLAGS=rv NETGROUP=-DNETGROUP \
+ AUX_OBJ=setenv.o TLI="-DTLI -DDRS_XTI" all
+
+# DELL System V.4 Issue 2.2 using gcc (kim@tac.nyc.ny.us, jurban@norden1.com)
+dell-gcc:
+ @make REAL_DAEMON_DIR=$(REAL_DAEMON_DIR) STYLE=$(STYLE) \
+ LIBS="-lsocket -lnsl" RANLIB=ranlib ARFLAGS=rv CC=gcc \
+ AUX_OBJ="setenv.o strcasecmp.o" TLI=-DTLI all
+
+# SCO 3.2v4.1 no frills (jedwards@sol1.solinet.net).
+sco:
+ @make REAL_DAEMON_DIR=$(REAL_DAEMON_DIR) STYLE=$(STYLE) \
+ LIBS="-lsocket -lnsl_s" RANLIB=echo ARFLAGS=rv \
+ NETGROUP= AUX_OBJ=setenv.o TLI= all
+
+# SCO OpenDesktop 2.0, release 3.2 (peter@midnight.com). Please simplify.
+sco-od2:
+ @make REAL_DAEMON_DIR=$(REAL_DAEMON_DIR) STYLE=$(STYLE) \
+ LIBS="-lrpcsvc -lrpc -lyp -lrpc -lrpcsvc -lsocket" \
+ RANLIB=echo ARFLAGS=rv AUX_OBJ=setenv.o \
+ NETGROUP=-DNETGROUP TLI= all
+
+# SCO 3.2v4.2 with TCP/IP 1.2.1 (Eduard.Vopicka@vse.cz). Please simplify.
+sco-nis:
+ @make REAL_DAEMON_DIR=$(REAL_DAEMON_DIR) STYLE=$(STYLE) \
+ LIBS="-lyp -lrpc -lsocket -lyp -lc_s -lc" \
+ RANLIB=echo ARFLAGS=rv AUX_OBJ=setenv.o \
+ NETGROUP=-DNETGROUP TLI= EXTRA_CFLAGS="-nointl -DNO_NETGRENT" all
+
+# SCO 3.2v5.0.0 OpenServer 5 (bob@odt.handy.com, bill@razorlogic.com)
+sco-os5:
+ @make REAL_DAEMON_DIR=$(REAL_DAEMON_DIR) STYLE=$(STYLE) \
+ LIBS="-lrpcsvc -lsocket" RANLIB=echo ARFLAGS=rv VSYSLOG= \
+ AUX_OBJ=setenv.o NETGROUP=-DNETGROUP TLI= all
+
+# sinix 5.42 setjmp workaround (szrzs023@ub3.ub.uni-kiel.de)
+sinix:
+ @make REAL_DAEMON_DIR=$(REAL_DAEMON_DIR) STYLE=$(STYLE) \
+ LIBS="-lsocket -lnsl -L/usr/ccs/lib -lc -L/usr/ucblib -lucb" \
+ RANLIB=echo ARFLAGS=rv AUX_OBJ=setenv.o TLI=-DTLI all
+
+# Domain SR10.4. Build under bsd, run under either sysv3 or bsd43.
+apollo:
+ @make REAL_DAEMON_DIR=$(REAL_DAEMON_DIR) STYLE=$(STYLE) \
+ LIBS= RANLIB=ranlib ARFLAGS=rv AUX_OBJ=setenv.o \
+ NETGROUP=-DNETGROUP TLI= SYSTYPE="-A run,any -A sys,any" all
+
+# Pyramid OSx 5.1, using the BSD universe.
+pyramid:
+ @make REAL_DAEMON_DIR=$(REAL_DAEMON_DIR) STYLE=$(STYLE) \
+ LIBS= RANLIB=ranlib ARFLAGS=rv AUX_OBJ="environ.o vfprintf.o" \
+ STRINGS="-Dstrchr=index -Dstrrchr=rindex -Dmemcmp=bcmp -Dno_memcpy" \
+ NETGROUP="-DNETGROUP -DUSE_GETDOMAIN" TLI= all
+
+# Untested.
+mips:
+ @echo "Warning: some definitions may be wrong."
+ make REAL_DAEMON_DIR=$(REAL_DAEMON_DIR) STYLE=$(STYLE) \
+ LIBS= RANLIB=ranlib ARFLAGS=rv AUX_OBJ=environ.o \
+ NETGROUP=-DNETGROUP TLI= SYSTYPE="-sysname bsd43" all
+
+# Cray (tested with UNICOS 7.0.4).
+unicos7:
+ @make REAL_DAEMON_DIR=$(REAL_DAEMON_DIR) STYLE=$(STYLE) \
+ LIBS=-lnet RANLIB=echo ARFLAGS=rv \
+ EXTRA_CFLAGS=-DINADDR_NONE="\"((unsigned long) -1)\"" \
+ AUX_OBJ="setenv.o strcasecmp.o" NETGROUP= TLI= all
+
+# Unicos 8.x, Cray-YMP (Bruce Kelly).
+unicos8:
+ @make REAL_DAEMON_DIR=$(REAL_DAEMON_DIR) STYLE=$(STYLE) \
+ LIBS= RANLIB=echo AR=bld ARFLAGS=rv \
+ AUX_OBJ= NETGROUP= TLI= all
+
+# Power_UNIX 2.1.1 (amantel@lerc.nasa.gov)
+power_unix_211:
+ @make REAL_DAEMON_DIR=$(REAL_DAEMON_DIR) STYLE=$(STYLE) \
+ LIBS="-lnsl -lsocket -lgen -lresolv" RANLIB=echo ARFLAGS=rv \
+ NETGROUP= AUX_OBJ=setenv.o TLI=-DTLI BUGS="$(BUGS)" all
+
+# ISC (fc@all.net)
+isc:
+ make REAL_DAEMON_DIR=$(REAL_DAEMON_DIR) STYLE=$(STYLE) \
+ LIBS="-linet -lnsl_s -ldbm" RANLIB=echo ARFLAGS=rv \
+ AUX_OBJ="setenv.o strcasecmp.o" EXTRA_CFLAGS="-DENOTCONN=ENAVAIL" \
+ NETGROUP= TLI= all
+
+# Interactive UNIX R3.2 version 4.0 (Bobby D. Wright).
+iunix:
+ make REAL_DAEMON_DIR=$(REAL_DAEMON_DIR) STYLE=$(STYLE) \
+ LIBS="-linet -lnsl_s -ldbm" RANLIB=echo ARFLAGS=rv \
+ AUX_OBJ=environ.o strcasecmp.o NETGROUP= TLI= all
+
+# RTU 6.0 on a Masscomp 5400 (ben@piglet.cr.usgs.gov). When using the
+# advanced installation, increment argv before actually looking at it.
+rtu:
+ @make REAL_DAEMON_DIR=$(REAL_DAEMON_DIR) STYLE=$(STYLE) \
+ LIBS= RANLIB=ranlib ARFLAGS=rv AUX_OBJ=environ.o \
+ NETGROUP= TLI= all
+
+# Unixware sans NIS (mc@telebase.com). Compiler dislikes strcasecmp.c.
+unixware1:
+ @make REAL_DAEMON_DIR=$(REAL_DAEMON_DIR) STYLE=$(STYLE) \
+ LIBS="-lsocket -lnsl -lc -L/usr/ucblib -lucb" RANLIB=echo ARFLAGS=rv \
+ NETGROUP=$(NETGROUP) AUX_OBJ=environ.o TLI=-DTLI all
+
+unixware2:
+ @make REAL_DAEMON_DIR=$(REAL_DAEMON_DIR) STYLE=$(STYLE) \
+ LIBS="-lsocket -lnsl -lgen -lc -L/usr/ucblib -lucb" RANLIB=echo \
+ ARFLAGS=rv NETGROUP=$(NETGROUP) AUX_OBJ=environ.o TLI=-DTLI all
+
+u6000:
+ @make REAL_DAEMON_DIR=$(REAL_DAEMON_DIR) STYLE=$(STYLE) \
+ LIBS="-lsocket -lnsl" RANLIB=echo ARFLAGS=rv \
+ NETGROUP=-DNETGROUP AUX_OBJ="setenv.o strcasecmp.o" TLI=-DTLI all
+
+# MachTen
+machten:
+ @make REAL_DAEMON_DIR=$(REAL_DAEMON_DIR) STYLE=$(STYLE) \
+ LIBS= RANLIB=ranlib ARFLAGS=rv AUX_OBJ=environ.o \
+ NETGROUP= TLI= all
+
+###############################################################
+# System dependencies: TLI (transport-level interface) support.
+#
+# Uncomment the following macro if your system has System V.4-style TLI
+# support (/usr/include/sys/timod.h, /etc/netconfig, and the netdir(3)
+# routines).
+#
+#TLI = -DTLI
+
+###############################################################################
+# System dependencies: differences between ranlib(1) and ar(1) implementations.
+#
+# Some C compilers (Ultrix 4.x) insist that ranlib(1) be run on an object
+# library; some don't care as long as the modules are in the right order;
+# some systems don't even have a ranlib(1) command. Make your choice.
+
+RANLIB = ranlib # have ranlib (BSD-ish UNIX)
+#RANLIB = echo # no ranlib (SYSV-ish UNIX)
+
+ARFLAGS = rv # most systems
+#ARFLAGS= rvs # IRIX 4.0.x
+
+AR = ar
+#AR = bld # Unicos 8.x
+
+#############################################################################
+# System dependencies: routines that are not present in the system libraries.
+#
+# If your system library does not have set/putenv() or strcasecmp(), use
+# the ones provided with this source distribution. The environ.c module
+# implements setenv(), getenv(), and putenv().
+
+AUX_OBJ= setenv.o
+#AUX_OBJ= environ.o
+#AUX_OBJ= environ.o strcasecmp.o
+
+# Uncomment the following if your C library does not provide the
+# strchr/strrchr/memcmp routines, but comes with index/rindex/bcmp.
+#
+#STRINGS= -Dstrchr=index -Dstrrchr=rindex -Dmemcmp=bcmp -Dno_memcpy
+
+#################################################################
+# System dependencies: selection of non-default object libraries.
+#
+# Most System V implementations require that you explicitly specify the
+# networking libraries. There is no general consensus, though.
+#
+#LIBS = -lsocket -lnsl # SysV.4 Solaris 2.x
+#LIBS = -lsun # IRIX
+#LIBS = -lsocket -linet -lnsl -lnfs # PTX
+#LIBS = -linet -lnsl_s -ldbm # ISC
+#LIBS = -lnet # Unicos 7
+#LIBS = -linet -lsyslog -ldbm
+#LIBS = -lsyslog -lsocket -lnsl
+
+######################################################
+# System dependencies: system-specific compiler flags.
+#
+# Apollo Domain/OS offers both bsd and sys5 environments, sometimes
+# on the same machine. If your Apollo is primarily sys5.3 and also
+# has bsd4.3, uncomment the following to build under bsd and run under
+# either environment.
+#
+#SYSTYPE= -A run,any -A sys,any
+
+# For MIPS RISC/os 4_52.p3, uncomment the following definition.
+#
+#SYSTYPE= -sysname bsd43
+
+##################################################
+# System dependencies: working around system bugs.
+#
+# -DGETPEERNAME_BUG works around a getpeername(2) bug in some versions of
+# Apollo or SYSV.4 UNIX: the wrapper would report that all UDP requests
+# come from address 0.0.0.0. The workaround does no harm on other systems.
+#
+# -DBROKEN_FGETS works around an fgets(3) bug in some System V versions
+# (IRIX): fgets() gives up too fast when reading from a network socket.
+# The workaround does no harm on other systems.
+#
+# Some UNIX systems (IRIX) make the error of calling the strtok() library
+# routine from other library routines such as, e.g., gethostbyname/addr().
+# The result is that hosts can slip through the wrapper allow/deny filters.
+# Compile with -DLIBC_CALLS_STRTOK to avoid the vendor's strtok() routine.
+# The workaround does no harm on other systems.
+#
+# DG/UX 5.4.1 comes with an inet_ntoa() function that returns a structure
+# instead of a long integer. Compile with -DINET_ADDR_BUG to work around
+# this mutant behavour. Fixed in 5.4R3.
+#
+# Solaris 2.4 gethostbyname(), in DNS through NIS mode, puts only one
+# address in the host address list; all other addresses are treated as
+# host name aliases. Compile with -DSOLARIS_24_GETHOSTBYNAME_BUG to work
+# around this. The workaround does no harm on other Solaris versions.
+
+BUGS = -DGETPEERNAME_BUG -DBROKEN_FGETS -DLIBC_CALLS_STRTOK
+#BUGS = -DGETPEERNAME_BUG -DBROKEN_FGETS -DINET_ADDR_BUG
+#BUGS = -DGETPEERNAME_BUG -DBROKEN_FGETS -DSOLARIS_24_GETHOSTBYNAME_BUG
+
+##########################################################################
+# System dependencies: whether or not your system has NIS (or YP) support.
+#
+# If your system supports NIS or YP-style netgroups, enable the following
+# macro definition. Netgroups are used only for host access control.
+#
+#NETGROUP= -DNETGROUP
+
+###############################################################
+# System dependencies: whether or not your system has vsyslog()
+#
+# If your system supports vsyslog(), comment out the following definition.
+# If in doubt leave it in, it won't harm.
+
+VSYSLOG = -Dvsyslog=myvsyslog
+
+# End of the system dependencies.
+#################################
+
+##############################
+# Start of the optional stuff.
+
+###########################################
+# Optional: Turning on language extensions
+#
+# Instead of the default access control language that is documented in
+# the hosts_access.5 document, the wrappers can be configured to
+# implement an extensible language documented in the hosts_options.5
+# document. This language is implemented by the "options.c" source
+# module, which also gives hints on how to add your own extensions.
+# Uncomment the next definition to turn on the language extensions
+# (examples: allow, deny, banners, twist and spawn).
+#
+#STYLE = -DPROCESS_OPTIONS # Enable language extensions.
+
+################################################################
+# Optional: Changing the default disposition of logfile records
+#
+# By default, logfile entries are written to the same file as used for
+# sendmail transaction logs. See your /etc/syslog.conf file for actual
+# path names of logfiles. The tutorial section in the README file
+# gives a brief introduction to the syslog daemon.
+#
+# Change the FACILITY definition below if you disagree with the default
+# disposition. Some syslog versions (including Ultrix 4.x) do not provide
+# this flexibility.
+#
+# If nothing shows up on your system, it may be that the syslog records
+# are sent to a dedicated loghost. It may also be that no syslog daemon
+# is running at all. The README file gives pointers to surrogate syslog
+# implementations for systems that have no syslog library routines or
+# no syslog daemons. When changing the syslog.conf file, remember that
+# there must be TABs between fields.
+#
+# The LOG_XXX names below are taken from the /usr/include/syslog.h file.
+
+FACILITY= LOG_MAIL # LOG_MAIL is what most sendmail daemons use
+
+# The syslog priority at which successful connections are logged.
+
+SEVERITY= LOG_INFO # LOG_INFO is normally not logged to the console
+
+###########################
+# Optional: Reduce DNS load
+#
+# When looking up the address for a host.domain name, the typical DNS
+# code will first append substrings of your own domain, so it tries
+# host.domain.your.own.domain, then host.domain.own.domain, and then
+# host.domain. The APPEND_DOT feature stops this waste of cycles. It is
+# off by default because it causes problems on sites that don't use DNS
+# and with Solaris < 2.4. APPEND_DOT will not work with hostnames taken
+# from /etc/hosts or from NIS maps. It does work with DNS through NIS.
+#
+# DOT= -DAPPEND_DOT
+
+##################################################
+# Optional: Always attempt remote username lookups
+#
+# By default, the wrappers look up the remote username only when the
+# access control rules require them to do so.
+#
+# Username lookups require that the remote host runs a daemon that
+# supports an RFC 931 like protocol. Remote user name lookups are not
+# possible for UDP-based connections, and can cause noticeable delays
+# with connections from non-UNIX PCs. On some systems, remote username
+# lookups can trigger a kernel bug, causing loss of service. The README
+# file describes how to find out if your UNIX kernel has that problem.
+#
+# Uncomment the following definition if the wrappers should always
+# attempt to get the remote user name. If this is not enabled you can
+# still do selective username lookups as documented in the hosts_access.5
+# and hosts_options.5 manual pages (`nroff -man' format).
+#
+#AUTH = -DALWAYS_RFC931
+#
+# The default username lookup timeout is 10 seconds. This may not be long
+# enough for slow hosts or networks, but is enough to irritate PC users.
+
+RFC931_TIMEOUT = 10
+
+######################################################
+# Optional: Changing the default file protection mask
+#
+# On many systems, network daemons and other system processes are started
+# with a zero umask value, so that world-writable files may be produced.
+# It is a good idea to edit your /etc/rc* files so that they begin with
+# an explicit umask setting. On our site we use `umask 022' because it
+# does not break anything yet gives adequate protection against tampering.
+#
+# The following macro specifies the default umask for processes run under
+# control of the daemon wrappers. Comment it out only if you are certain
+# that inetd and its children are started with a safe umask value.
+
+UMASK = -DDAEMON_UMASK=022
+
+#######################################
+# Optional: Turning off access control
+#
+# By default, host access control is enabled. To disable host access
+# control, comment out the following definition. Host access control
+# can also be turned off at runtime by providing no or empty access
+# control tables.
+
+ACCESS = -DHOSTS_ACCESS
+
+########################################################
+# Optional: Changing the access control table pathnames
+#
+# The HOSTS_ALLOW and HOSTS_DENY macros define where the programs will
+# look for access control information. Watch out for the quotes and
+# backslashes when you make changes.
+
+TABLES = -DHOSTS_DENY=\"/etc/hosts.deny\" -DHOSTS_ALLOW=\"/etc/hosts.allow\"
+
+####################################################
+# Optional: dealing with host name/address conflicts
+#
+# By default, the software tries to protect against hosts that claim to
+# have someone elses host name. This is relevant for network services
+# whose authentication depends on host names, such as rsh and rlogin.
+#
+# With paranoid mode on, connections will be rejected when the host name
+# does not match the host address. Connections will also be rejected when
+# the host name is available but cannot be verified.
+#
+# Comment out the following definition if you want more control over such
+# requests. When paranoid mode is off and a host name double check fails,
+# the client can be matched with the PARANOID access control pattern.
+#
+# Paranoid mode implies hostname lookup. In order to disable hostname
+# lookups altogether, see the next section.
+
+PARANOID= -DPARANOID
+
+########################################
+# Optional: turning off hostname lookups
+#
+# By default, the software always attempts to look up the client
+# hostname. With selective hostname lookups, the client hostname
+# lookup is postponed until the name is required by an access control
+# rule or by a %letter expansion.
+#
+# In order to perform selective hostname lookups, disable paranoid
+# mode (see previous section) and comment out the following definition.
+
+HOSTNAME= -DALWAYS_HOSTNAME
+
+#############################################
+# Optional: Turning on host ADDRESS checking
+#
+# Optionally, the software tries to protect against hosts that pretend to
+# have someone elses host address. This is relevant for network services
+# whose authentication depends on host names, such as rsh and rlogin,
+# because the network address is used to look up the remote host name.
+#
+# The protection is to refuse TCP connections with IP source routing
+# options.
+#
+# This feature cannot be used with SunOS 4.x because of a kernel bug in
+# the implementation of the getsockopt() system call. Kernel panics have
+# been observed for SunOS 4.1.[1-3]. Symptoms are "BAD TRAP" and "Data
+# fault" while executing the tcp_ctloutput() kernel function.
+#
+# Reportedly, Sun patch 100804-03 or 101790 fixes this for SunOS 4.1.x.
+#
+# Uncomment the following macro definition if your getsockopt() is OK.
+#
+# -DKILL_IP_OPTIONS is not needed on modern UNIX systems that can stop
+# source-routed traffic in the kernel. Examples: 4.4BSD derivatives,
+# Solaris 2.x, and Linux. See your system documentation for details.
+#
+# KILL_OPT= -DKILL_IP_OPTIONS
+
+## End configuration options
+############################
+
+# Protection against weird shells or weird make programs.
+
+SHELL = /bin/sh
+.c.o:; $(CC) $(CFLAGS) -c $*.c
+
+CFLAGS = -O -DFACILITY=$(FACILITY) $(ACCESS) $(PARANOID) $(NETGROUP) \
+ $(BUGS) $(SYSTYPE) $(AUTH) $(UMASK) \
+ -DREAL_DAEMON_DIR=\"$(REAL_DAEMON_DIR)\" $(STYLE) $(KILL_OPT) \
+ -DSEVERITY=$(SEVERITY) -DRFC931_TIMEOUT=$(RFC931_TIMEOUT) \
+ $(UCHAR) $(TABLES) $(STRINGS) $(TLI) $(EXTRA_CFLAGS) $(DOT) \
+ $(VSYSLOG) $(HOSTNAME)
+
+LIB_OBJ= hosts_access.o options.o shell_cmd.o rfc931.o eval.o \
+ hosts_ctl.o refuse.o percent_x.o clean_exit.o $(AUX_OBJ) \
+ $(FROM_OBJ) fix_options.o socket.o tli.o workarounds.o \
+ update.o misc.o diag.o percent_m.o myvsyslog.o
+
+FROM_OBJ= fromhost.o
+
+KIT = README miscd.c tcpd.c fromhost.c hosts_access.c shell_cmd.c \
+ tcpd.h tcpdmatch.c Makefile hosts_access.5 strcasecmp.c BLURB rfc931.c \
+ tcpd.8 eval.c hosts_access.3 hosts_ctl.c percent_x.c options.c \
+ clean_exit.c environ.c patchlevel.h fix_options.c workarounds.c \
+ socket.c tli.c DISCLAIMER fakelog.c safe_finger.c hosts_options.5 \
+ CHANGES try-from.c update.c ptx.c vfprintf.c tli-sequent.c \
+ tli-sequent.h misc.c diag.c ncr.c tcpdchk.c percent_m.c \
+ myvsyslog.c mystdarg.h printf.ck README.IRIX Banners.Makefile \
+ refuse.c tcpdchk.8 setenv.c inetcf.c inetcf.h scaffold.c \
+ scaffold.h tcpdmatch.8 README.NIS
+
+LIB = libwrap.a
+
+all other: config-check tcpd tcpdmatch try-from safe_finger tcpdchk
+
+# Invalidate all object files when the compiler options (CFLAGS) have changed.
+
+config-check:
+ @set +e; test -n "$(REAL_DAEMON_DIR)" || { make; exit 1; }
+ @set +e; echo $(CFLAGS) >/tmp/cflags.$$$$ ; \
+ if cmp cflags /tmp/cflags.$$$$ ; \
+ then rm /tmp/cflags.$$$$ ; \
+ else mv /tmp/cflags.$$$$ cflags ; \
+ fi >/dev/null 2>/dev/null
+
+$(LIB): $(LIB_OBJ)
+ rm -f $(LIB)
+ $(AR) $(ARFLAGS) $(LIB) $(LIB_OBJ)
+ -$(RANLIB) $(LIB)
+
+tcpd: tcpd.o $(LIB)
+ $(CC) $(CFLAGS) -o $@ tcpd.o $(LIB) $(LIBS)
+
+miscd: miscd.o $(LIB)
+ $(CC) $(CFLAGS) -o $@ miscd.o $(LIB) $(LIBS)
+
+safe_finger: safe_finger.o $(LIB)
+ $(CC) $(CFLAGS) -o $@ safe_finger.o $(LIB) $(LIBS)
+
+TCPDMATCH_OBJ = tcpdmatch.o fakelog.o inetcf.o scaffold.o
+
+tcpdmatch: $(TCPDMATCH_OBJ) $(LIB)
+ $(CC) $(CFLAGS) -o $@ $(TCPDMATCH_OBJ) $(LIB) $(LIBS)
+
+try-from: try-from.o fakelog.o $(LIB)
+ $(CC) $(CFLAGS) -o $@ try-from.o fakelog.o $(LIB) $(LIBS)
+
+TCPDCHK_OBJ = tcpdchk.o fakelog.o inetcf.o scaffold.o
+
+tcpdchk: $(TCPDCHK_OBJ) $(LIB)
+ $(CC) $(CFLAGS) -o $@ $(TCPDCHK_OBJ) $(LIB) $(LIBS)
+
+shar: $(KIT)
+ @shar $(KIT)
+
+kit: $(KIT)
+ @makekit $(KIT)
+
+files:
+ @echo $(KIT)
+
+archive:
+ $(ARCHIVE) $(KIT)
+
+clean:
+ rm -f tcpd miscd safe_finger tcpdmatch tcpdchk try-from *.[oa] core \
+ cflags
+
+tidy: clean
+ chmod -R a+r .
+ chmod 755 .
+
+# Enable all bells and whistles for linting.
+
+lint: tcpd_lint miscd_lint match_lint chk_lint
+
+tcpd_lint:
+ lint -DFACILITY=LOG_MAIL -DHOSTS_ACCESS -DPARANOID -DNETGROUP \
+ -DGETPEERNAME_BUG -DDAEMON_UMASK=022 -DSEVERITY=$(SEVERITY) \
+ $(TABLES) -DKILL_IP_OPTIONS -DPROCESS_OPTIONS \
+ -DRFC931_TIMEOUT=$(RFC931_TIMEOUT) -DALWAYS_RFC931 \
+ -DREAL_DAEMON_DIR=\"$(REAL_DAEMON_DIR)\" \
+ -Dvsyslog=myvsyslog \
+ tcpd.c fromhost.c socket.c tli.c hosts_access.c \
+ shell_cmd.c refuse.c rfc931.c eval.c percent_x.c clean_exit.c \
+ options.c setenv.c fix_options.c workarounds.c update.c misc.c \
+ diag.c myvsyslog.c percent_m.c
+
+miscd_lint:
+ lint -DFACILITY=LOG_MAIL -DHOSTS_ACCESS -DPARANOID -DNETGROUP \
+ -DGETPEERNAME_BUG -DDAEMON_UMASK=022 -DSEVERITY=$(SEVERITY) \
+ $(TABLES) -DKILL_IP_OPTIONS -DPROCESS_OPTIONS \
+ -DRFC931_TIMEOUT=$(RFC931_TIMEOUT) -DALWAYS_RFC931 \
+ -DREAL_DAEMON_DIR=\"$(REAL_DAEMON_DIR)\" \
+ -Dvsyslog=myvsyslog \
+ miscd.c fromhost.c socket.c tli.c hosts_access.c \
+ shell_cmd.c refuse.c rfc931.c eval.c percent_x.c clean_exit.c \
+ options.c setenv.c fix_options.c workarounds.c update.c misc.c \
+ diag.c myvsyslog.c percent_m.c
+
+match_lint:
+ lint -DFACILITY=LOG_MAIL -DSEVERITY=$(SEVERITY) -DHOSTS_ACCESS \
+ -DPARANOID $(TABLES) -DNETGROUP -DPROCESS_OPTIONS -DRFC931_TIMEOUT=10 \
+ -DREAL_DAEMON_DIR=\"$(REAL_DAEMON_DIR)\" \
+ -Dvsyslog=myvsyslog \
+ tcpdmatch.c hosts_access.c eval.c percent_x.c options.c workarounds.c \
+ update.c socket.c misc.c diag.c myvsyslog.c percent_m.c setenv.c \
+ inetcf.c scaffold.c
+
+chk_lint:
+ lint -DFACILITY=LOG_MAIL -DSEVERITY=$(SEVERITY) -DHOSTS_ACCESS \
+ -DPARANOID $(TABLES) -DNETGROUP -DPROCESS_OPTIONS -DRFC931_TIMEOUT=10 \
+ -DREAL_DAEMON_DIR=\"$(REAL_DAEMON_DIR)\" \
+ -Dvsyslog=myvsyslog \
+ tcpdchk.c eval.c percent_x.c options.c update.c workarounds.c \
+ setenv.c misc.c diag.c myvsyslog.c percent_m.c inetcf.c scaffold.c
+
+printfck:
+ printfck -f printf.ck \
+ tcpd.c fromhost.c socket.c tli.c hosts_access.c \
+ shell_cmd.c refuse.c rfc931.c eval.c percent_x.c clean_exit.c \
+ options.c setenv.c fix_options.c workarounds.c update.c misc.c \
+ diag.c myvsyslog.c percent_m.c >aap.c
+ lint -DFACILITY=LOG_MAIL -DHOSTS_ACCESS -DPARANOID -DNETGROUP \
+ -DGETPEERNAME_BUG -DDAEMON_UMASK=022 -DSEVERITY=$(SEVERITY) \
+ $(TABLES) -DKILL_IP_OPTIONS -DPROCESS_OPTIONS \
+ -DRFC931_TIMEOUT=$(RFC931_TIMEOUT) -DALWAYS_RFC931 \
+ -DREAL_DAEMON_DIR=\"$(REAL_DAEMON_DIR)\" -Dvsyslog=myvsyslog aap.c
+ printfck -f printf.ck \
+ tcpdchk.c eval.c percent_x.c options.c update.c workarounds.c \
+ setenv.c misc.c diag.c myvsyslog.c percent_m.c inetcf.c scaffold.c \
+ >aap.c
+ lint -DFACILITY=LOG_MAIL -DSEVERITY=$(SEVERITY) -DHOSTS_ACCESS \
+ -DPARANOID $(TABLES) -DNETGROUP -DPROCESS_OPTIONS -DRFC931_TIMEOUT=10 \
+ -Dvsyslog=myvsyslog -DREAL_DAEMON_DIR=\"$(REAL_DAEMON_DIR)\"
+
+# Internal compilation dependencies.
+
+clean_exit.o: cflags
+clean_exit.o: tcpd.h
+diag.o: cflags
+diag.o: mystdarg.h
+diag.o: tcpd.h
+environ.o: cflags
+eval.o: cflags
+eval.o: tcpd.h
+fakelog.o: cflags
+fakelog.o: mystdarg.h
+fix_options.o: cflags
+fix_options.o: tcpd.h
+fromhost.o: cflags
+fromhost.o: tcpd.h
+hosts_access.o: cflags
+hosts_access.o: tcpd.h
+hosts_ctl.o: cflags
+hosts_ctl.o: tcpd.h
+inetcf.o: cflags
+inetcf.o: inetcf.h
+inetcf.o: tcpd.h
+misc.o: cflags
+misc.o: tcpd.h
+miscd.o: cflags
+miscd.o: patchlevel.h
+miscd.o: tcpd.h
+myvsyslog.o: cflags
+myvsyslog.o: mystdarg.h
+myvsyslog.o: tcpd.h
+ncr.o: cflags
+ncr.o: tcpd.h
+options.o: cflags
+options.o: tcpd.h
+percent_m.o: cflags
+percent_m.o: mystdarg.h
+percent_x.o: cflags
+percent_x.o: tcpd.h
+ptx.o: cflags
+ptx.o: tcpd.h
+refuse.o: cflags
+refuse.o: tcpd.h
+rfc931.o: cflags
+rfc931.o: tcpd.h
+safe_finger.o: cflags
+scaffold.o: cflags
+scaffold.o: scaffold.h
+scaffold.o: tcpd.h
+setenv.o: cflags
+shell_cmd.o: cflags
+shell_cmd.o: tcpd.h
+socket.o: cflags
+socket.o: tcpd.h
+strcasecmp.o: cflags
+tcpd.o: cflags
+tcpd.o: patchlevel.h
+tcpd.o: tcpd.h
+tcpdchk.o: cflags
+tcpdchk.o: inetcf.h
+tcpdchk.o: scaffold.h
+tcpdchk.o: tcpd.h
+tcpdmatch.o: cflags
+tcpdmatch.o: scaffold.h
+tcpdmatch.o: tcpd.h
+tli-sequent.o: cflags
+tli-sequent.o: tcpd.h
+tli-sequent.o: tli-sequent.h
+tli.o: cflags
+tli.o: tcpd.h
+try-from.o: cflags
+try-from.o: tcpd.h
+update.o: cflags
+update.o: mystdarg.h
+update.o: tcpd.h
+vfprintf.o: cflags
+workarounds.o: cflags
+workarounds.o: tcpd.h
diff --git a/contrib/tcp_wrappers/README b/contrib/tcp_wrappers/README
new file mode 100644
index 000000000000..98b6b472a4d5
--- /dev/null
+++ b/contrib/tcp_wrappers/README
@@ -0,0 +1,1038 @@
+@(#) README 1.30 97/03/21 19:27:21
+
+This is the 7.6 version of the TCP/IP daemon wrapper package.
+
+Thank you for using this program. If you like it, send me a postcard.
+My postal address is at the bottom of this file.
+
+Read the BLURB file for a brief summary of what is new. The CHANGES
+file gives a complete account of differences with respect to previous
+releases.
+
+Announcements of new releases of this software are posted to Usenet
+(comp.security.unix, comp.unix.admin), to the cert-tools mailing list,
+and to a dedicated mailing list. You can subscribe to the dedicated
+mailing list by sending an email message to majordomo@wzv.win.tue.nl
+with in the body (not subject): subscribe tcp-wrappers-announce.
+
+Table of contents
+-----------------
+
+ 1 - Introduction
+ 2 - Disclaimer
+ 3 - Tutorials
+ 3.1 - How it works
+ 3.2 - Where the logging information goes
+ 4 - Features
+ 4.1 - Access control
+ 4.2 - Host name spoofing
+ 4.3 - Host address spoofing
+ 4.4 - Client username lookups
+ 4.5 - Language extensions
+ 4.6 - Multiple ftp/gopher/www archives on one host
+ 4.7 - Banner messages
+ 4.8 - Sequence number guessing
+ 5 - Other works
+ 5.1 - Related documents
+ 5.2 - Related software
+ 6 - Limitations
+ 6.1 - Known wrapper limitations
+ 6.2 - Known system software bugs
+ 7 - Configuration and installation
+ 7.1 - Easy configuration and installation
+ 7.2 - Advanced configuration and installation
+ 7.3 - Daemons with arbitrary path names
+ 7.4 - Building and testing the access control rules
+ 7.5 - Other applications
+ 8 - Acknowledgements
+
+1 - Introduction
+----------------
+
+With this package you can monitor and filter incoming requests for the
+SYSTAT, FINGER, FTP, TELNET, RLOGIN, RSH, EXEC, TFTP, TALK, and other
+network services.
+
+It supports both 4.3BSD-style sockets and System V.4-style TLI. Praise
+yourself lucky if you don't know what that means.
+
+The package provides tiny daemon wrapper programs that can be installed
+without any changes to existing software or to existing configuration
+files. The wrappers report the name of the client host and of the
+requested service; the wrappers do not exchange information with the
+client or server applications, and impose no overhead on the actual
+conversation between the client and server applications.
+
+Optional features are: access control to restrict what systems can
+connect to what network daemons; client user name lookups with the RFC
+931 etc. protocol; additional protection against hosts that pretend to
+have someone elses host name; additional protection against hosts that
+pretend to have someone elses host address.
+
+The programs are very portable. Build procedures are provided for many
+common (and not so common) environments, and guidelines are provided in
+case your environment is not among them.
+
+Requirements are that network daemons are spawned by a super server
+such as the inetd; a 4.3BSD-style socket programming interface and/or
+System V.4-style TLI programming interface; and the availability of a
+syslog(3) library and of a syslogd(8) daemon. The wrappers should run
+without modification on any system that satisfies these requirements.
+Workarounds have been implemented for several common bugs in systems
+software.
+
+What to do if this is your first encounter with the wrapper programs:
+1) read the tutorial sections for an introduction to the relevant
+concepts and terminology; 2) glance over the security feature sections
+in this document; 3) follow the installation instructions (easy or
+advanced). I recommend that you first use the default security feature
+settings. Run the wrappers for a few days to become familiar with
+their logs, before doing anything drastic such as cutting off access or
+installing booby traps.
+
+2 - Disclaimer
+--------------
+
+The wrapper programs rely on source address information obtained from
+network packets. This information is provided by the client host. It is
+not 100 percent reliable, although the wrappers do their best to expose
+forgeries.
+
+In the absence of cryptographic protection of message contents, and of
+cryptographic authentication of message originators, all data from the
+network should be treated with sound scepticism.
+
+THIS RESTRICTION IS BY NO MEANS SPECIFIC TO THE TCP/IP PROTOCOLS.
+
+3 - Tutorials
+-------------
+
+The tutorial sections give a gentle introduction to the operation of
+the wrapper programs, and introduce some of the terminology that is
+used in the remainder of the document: client, server, the inetd and
+syslogd daemons, and their configuration files.
+
+3.1 - How it works
+------------------
+
+Almost every application of the TCP/IP protocols is based on a client-
+server model. For example, when a user invokes the telnet command to
+connect to one of your systems, a telnet server process is executed on
+the target host. The telnet server process connects the user to a login
+process. A few examples of client and server programs are shown in the
+table below:
+
+ client server application
+ --------------------------------
+ telnet telnetd remote login
+ ftp ftpd file transfer
+ finger fingerd show users
+
+The usual approach is to run one single daemon process that waits for
+all kinds of incoming network connections. Whenever a connection is
+established, this daemon (usually called inetd) runs the appropriate
+server program and goes back to sleep, waiting for other connections.
+
+The wrapper programs rely on a simple, but powerful mechanism. Instead
+of directly running the desired server program, the inetd is tricked
+into running a small wrapper program. The wrapper logs the client host
+name or address and performs some additional checks. When all is well,
+the wrapper executes the desired server program and goes away.
+
+The wrapper programs have no interaction with the client user (or with
+the client process). Nor do the wrappers interact with the server
+application. This has two major advantages: 1) the wrappers are
+application-independent, so that the same program can protect many
+kinds of network services; 2) no interaction also means that the
+wrappers are invisible from outside (at least for authorized users).
+
+Another important property is that the wrapper programs are active only
+when the initial contact between client and server is established. Once
+a wrapper has done its work there is no overhead on the client-server
+conversation.
+
+The simple mechanism has one major drawback: the wrappers go away after
+the initial contact between client and server processes, so the
+wrappers are of little use with network daemons that service more than
+one client. The wrappers would only see the first client attempt to
+contact such a server. The NFS mount daemon is a typical example of a
+daemon that services requests from multiple clients. See the section on
+related software for ways to deal with such server programs.
+
+There are two ways to use the wrapper programs:
+
+1) The easy way: move network daemons to some other directory and fill
+ the resulting holes with copies of the wrapper programs. This
+ approach involves no changes to system configuration files, so there
+ is very little risk of breaking things.
+
+2) The advanced way: leave the network daemons alone and modify the
+ inetd configuration file. For example, an entry such as:
+
+ tftp dgram udp wait root /usr/etc/tcpd in.tftpd -s /tftpboot
+
+ When a tftp request arrives, inetd will run the wrapper program
+ (tcpd) with a process name `in.tftpd'. This is the name that the
+ wrapper will use when logging the request and when scanning the
+ optional access control tables. `in.tftpd' is also the name of the
+ server program that the wrapper will attempt to run when all is
+ well. Any arguments (`-s /tftpboot' in this particular example) are
+ transparently passed on to the server program.
+
+For an account of the history of the wrapper programs, with real-life
+examples, see the section below on related documents.
+
+3.2 - Where the logging information goes
+----------------------------------------
+
+The wrapper programs send their logging information to the syslog
+daemon (syslogd). The disposition of the wrapper logs is determined by
+the syslog configuration file (usually /etc/syslog.conf). Messages are
+written to files, to the console, or are forwarded to a @loghost. Some
+syslogd versions can even forward messages down a |pipeline.
+
+Older syslog implementations (still found on Ultrix systems) only
+support priority levels ranging from 9 (debug-level messages) to 0
+(alerts). All logging information of the specified priority level or
+more urgent is written to the same destination. In the syslog.conf
+file, priority levels are specified in numerical form. For example,
+
+ 8/usr/spool/mqueue/syslog
+
+causes all messages with priority 8 (informational messages), and
+anything that is more urgent, to be appended to the file
+/usr/spool/mqueue/syslog.
+
+Newer syslog implementations support message classes in addition to
+priority levels. Examples of message classes are: mail, daemon, auth
+and news. In the syslog.conf file, priority levels are specified with
+symbolic names: debug, info, notice, ..., emerg. For example,
+
+ mail.debug /var/log/syslog
+
+causes all messages of class mail with priority debug (or more urgent)
+to be appended to the /var/log/syslog file.
+
+By default, the wrapper logs go to the same place as the transaction
+logs of the sendmail daemon. The disposition can be changed by editing
+the Makefile and/or the syslog.conf file. Send a `kill -HUP' to the
+syslogd after changing its configuration file. Remember that syslogd,
+just like sendmail, insists on one or more TABs between the left-hand
+side and the right-hand side expressions in its configuration file.
+
+Solaris 2.x note: the syslog daemon depends on the m4 macro processor.
+The m4 program is installed as part of the software developer packages.
+
+Trouble shooting note: when the syslogging does not work as expected,
+run the program by hand (`syslogd -d') and see what really happens.
+
+4 - Features
+------------
+
+4.1 - Access control
+--------------------
+
+When compiled with -DHOSTS_ACCESS, the wrapper programs support a
+simple form of access control. Access can be controlled per host, per
+service, or combinations thereof. The software provides hooks for the
+execution of shell commands when an access control rule fires; this
+feature may be used to install "booby traps". For details, see the
+hosts_access.5 manual page, which is in `nroff -man' format. A later
+section describes how you can test your access control rules.
+
+Access control can also be used to connect clients to the "right"
+service. What is right may depend on the requested service, the origin
+of the request, and what host address the client connects to. Examples:
+
+(1) A gopher or www database speaks native language when contacted from
+ within the country, otherwise it speaks English.
+
+(2) A service provider offers different ftp, gopher or www services
+ with different internet hostnames from one host (section 4.6).
+
+Access control is enabled by default. It can be turned off by editing
+the Makefile, or by providing no access control tables. The install
+instructions below describe the Makefile editing process.
+
+The hosts_options.5 manual page (`nroff -man' format) documents an
+extended version of the access control language. The extensions are
+disabled by default. See the section below on language extensions.
+
+Later System V implementations provide the Transport Level Interface
+(TLI), a network programming interface that performs functions similar
+to the Berkeley socket programming interface. Like Berkeley sockets,
+TLI was designed to cover multiple protocols, not just Internet.
+
+When the wrapper discovers that the TLI interface sits on top of a
+TCP/IP or UDP/IP conversation it uses this knowledge to provide the
+same functions as with traditional socket-based applications. When
+some other protocol is used underneath TLI, the host address will be
+some universal magic cookie that may not even be usable for access
+control purposes.
+
+4.2 - Host name spoofing
+------------------------
+
+With some network applications, such as RSH or RLOGIN, the client host
+name plays an important role in the authentication process. Host name
+information can be reliable when lookups are done from a _local_ hosts
+table, provided that the client IP address can be trusted.
+
+With _distributed_ name services, authentication schemes that rely on
+host names become more problematic. The security of your system now may
+depend on some far-away DNS (domain name server) outside your own
+control.
+
+The wrapper programs verify the client host name that is returned by
+the address->name DNS server, by asking for a second opinion. To this
+end, the programs look at the name and addresses that are returned by
+the name->address DNS server, which may be an entirely different host.
+
+If any name or address discrepancies are found, or if the second DNS
+opinion is not available, the wrappers assume that one of the two name
+servers is lying, and assume that the client host pretends to have
+someone elses host name.
+
+When compiled with -DPARANOID, the wrappers will always attempt to look
+up and double check the client host name, and will always refuse
+service in case of a host name/address discrepancy. This is a
+reasonable policy for most systems.
+
+When compiled without -DPARANOID, the wrappers by default still perform
+hostname lookup. You can match hosts with a name/address discrepancy
+with the PARANOID wildcard and decide whether or not to grant service.
+
+Automatic hostname verification is enabled by default. Automatic
+hostname lookups and verification can be turned off by editing the
+Makefile. The configuration and installation section below describes
+the Makefile editing process.
+
+4.3 - Host address spoofing
+---------------------------
+
+While host name spoofing can be found out by asking a second opinion,
+it is much harder to find out that a host claims to have someone elses
+network address. And since host names are deduced from network
+addresses, address spoofing is at least as effective as name spoofing.
+
+The wrapper programs can give additional protection against hosts that
+claim to have an address that lies outside their own network. For
+example, some far-away host that claims to be a trusted host within
+your own network. Such things are possible even while the impersonated
+system is up and running.
+
+This additional protection is not an invention of my own; it has been
+present for at least five years in the BSD rsh and rlogin daemons.
+Unfortunately, that feature was added *after* 4.3 BSD came out, so that
+very few, if any, UNIX vendors have adopted it. Our site, and many
+other ones, has been running these enhanced daemons for several years,
+and without any ill effects.
+
+When the wrapper programs are compiled with -DKILL_IP_OPTIONS, the
+programs refuse to service TCP connections with IP source routing
+options. -DKILL_IP_OPTIONS is not needed on modern UNIX systems
+that can stop source-routed traffic in the kernel. Examples are
+4.4BSD derivatives, Solaris 2.x, and Linux. See your system manuals
+for details.
+
+If you are going to use this feature on SunOS 4.1.x you should apply
+patch 100804-03+ or 101790-something depending on your SunOS version.
+Otherwise you may experience "BAD TRAP" and "Data fault" panics when
+the getsockopt() system call is executed after a TCP RESET has been
+received. This is a kernel bug, it is not the fault of the wrappers.
+
+The feature is disabled by default. It can be turned on by editing the
+Makefile. The configuration and installation section below describes
+the Makefile editing process.
+
+UDP services do not benefit from this additional protection. With UDP,
+all you can be certain of is the network packet's destination address.
+
+4.4 - Client username lookups
+-----------------------------
+
+The protocol proposed in RFC 931 provides a means to obtain the client
+user name from the client host. The requirement is that the client
+host runs an RFC 931-compliant daemon. The information provided by such
+a daemon is not intended to be used for authentication purposes, but it
+can provide additional information about the owner of a TCP connection.
+
+The RFC 931 protocol has diverged into different directions (IDENT,
+TAP, RFC 1413). To add to the confusion, they all use the same network
+port. The daemon wrappers implement a common subset of the protocols.
+
+There are some limitations: the number of hosts that run an RFC 931 (or
+compatible) daemon is limited (but growing); client user name lookups
+do not work for datagram (UDP) services. More seriously, client user
+name lookups can cause noticeable delays with connections from non-UNIX
+PCs. Recent PC software seem to have fixed this (for example NCSA
+telnet). The wrappers use a 10-second timeout for RFC931 lookups, to
+accommodate slow networks and slow hosts.
+
+By default, the wrappers will do username lookup only when the access
+control rules require them to do so (via user@host client patterns, see
+the hosts_access.5 manual page) or when the username is needed for
+%<letter> expansions.
+
+You can configure the wrappers to always perform client username
+lookups, by editing the Makefile. The client username lookup timeout
+period (10 seconds default) can be changed by editing the Makefile. The
+installation sections below describe the Makefile editing process.
+
+On System V with TLI-based network services, client username lookups
+will be possible only when the underlying network protocol is TCP/IP.
+
+4.5 - Language extensions
+-------------------------
+
+The wrappers sport only a limited number of features. This is for a
+good reason: programs that run at high privilege levels must be easy to
+verify. And the smaller a program, the easier to verify. There is,
+however, a provision to add features.
+
+The options.c module provides a framework for language extensions.
+Quite a few extensions have already been implemented; they are
+documented in the hosts_options.5 document, which is in `nroff -man'
+format. Examples: changing the severity level at which a request for
+service is logged; "allow" and "deny" keywords; running a customized
+server instead of the standard one; many others.
+
+The language extensions are not enabled by default because they
+introduce an incompatible change to the access control language
+syntax. Instructions to enable the extensions are given in the
+Makefile.
+
+4.6 - Multiple ftp/gopher/www archives on one host
+--------------------------------------------------
+
+Imagine one host with multiple internet addresses. These addresses do
+not need to have the same internet hostname. Thus, it is possible to
+offer services with different internet hostnames from just one host.
+
+Service providers can use this to offer organizations a presence on the
+"net" with their own internet hostname, even when those organizations
+aren't connected to the Internet at all. To the end user it makes no
+difference, because applications use internet hostnames.
+
+There are several ways to assign multiple addresses to one machine.
+The nice way is to take an existing network interface and to assign
+additional internet addresses with the `ifconfig' command. Examples:
+
+ Solaris 2: ifconfig le0:1 <address> netmask <mask> up
+ 4.4 BSD: ifconfig en0 alias <address> netmask <mask>
+
+On other systems one has to increase the number of network interfaces:
+either with hardware interfaces, or with pseudo interfaces like SLIP or
+PPP. The interfaces do not need to be attached to anything. They just
+need to be up and to be assigned a suitable internet address and mask.
+
+With the wrapper software, `daemon@host' access control patterns can be
+used to distinguish requests by the network address that they are aimed
+at. Judicious use of the `twist' option (see the hosts_options.5 file,
+`nroff -man' format) can guide the requests to the right server. These
+can be servers that live in separate chroot areas, or servers modified
+to take additional context from the command line, or a combination.
+
+Another way is to modify gopher or www listeners so that they bind to
+only one specific network address. Multiple gopher or www servers can
+then be run side by side, each taking requests sent to its respective
+network address.
+
+4.7 - Banner messages
+---------------------
+
+Some sites are required to present an informational message to users
+before they attempt to login. Banner messages can also be useful when
+denying service: instead of simply dropping the connection a polite
+explanation is given first. Finally, banners can be used to give your
+system a more personal touch.
+
+The wrapper software provides easy-to-use tools to generate pre-login
+banners for ftp, telnet, rlogin etc. from a single prototype banner
+textfile. Details on banners and on-the-fly %<letter> expansions are
+given in the hosts_options.5 manual page (`nroff -man' format). An
+example is given in the file Banners.Makefile.
+
+In order to support banner messages the wrappers have to be built with
+language extensions enabled. See the section on language extensions.
+
+4.8 - Sequence number guessing
+------------------------------
+
+Recently, systems came under attack from intruders that exploited a
+well-known weakness in TCP/IP sequence number generators. This
+weakness allows intruders to impersonate trusted hosts. Break-ins have
+been reported via the rsh service. In fact, any network service can be
+exploited that trusts the client host name or address.
+
+A long-term solution is to stop using network services that trust the
+client host name or address, and to use data encryption instead.
+
+A short-term solution, as outlined in in CERT advisory CA-95:01, is to
+configure network routers so that they discard datagrams from "outside"
+with an "inside" source address. This approach is most fruitful when
+you do not trust any hosts outside your local network.
+
+The IDENT (RFC931 etc.) client username lookup protocol can help to
+detect host impersonation attacks. Before accepting a client request,
+the wrappers can query the client's IDENT server and find out that the
+client never sent that request.
+
+When the client host provides IDENT service, a negative IDENT lookup
+result (the client matches `UNKNOWN@host') is strong evidence of a host
+impersonation attack.
+
+A positive IDENT lookup result (the client matches `KNOWN@host') is
+less trustworthy. It is possible for an attacker to spoof both the
+client request and the IDENT lookup connection, although doing so
+should be much harder than spoofing just a client request. Another
+possibility is that the client's IDENT server is lying.
+
+Client username lookups are described in more detail in a previous
+section. Pointers to IDENT daemon software are described in the section
+on related software.
+
+5 - Other works
+---------------
+
+5.1 - Related documents
+-----------------------
+
+The war story behind the tcp wrapper tools is described in:
+
+ W.Z. Venema, "TCP WRAPPER, network monitoring, access control and
+ booby traps", UNIX Security Symposium III Proceedings (Baltimore),
+ September 1992.
+
+ ftp.win.tue.nl:/pub/security/tcp_wrapper.ps.Z (postscript)
+ ftp.win.tue.nl:/pub/security/tcp_wrapper.txt.Z (flat text)
+
+The same cracker is also described in:
+
+ W.R. Cheswick, "An Evening with Berferd, In Which a Cracker is
+ Lured, Endured, and Studied", Proceedings of the Winter USENIX
+ Conference (San Francisco), January 1992.
+
+ research.att.com:/dist/internet_security/berferd.ps
+
+An updated version of the latter paper appeared in:
+
+ W.R. Cheswick, S.M. Bellovin, "Firewalls and Internet Security",
+ Addison-Wesley, 1994.
+
+Discussions on internet firewalls are archived on ftp.greatcircle.com.
+Subscribe to the mailing list by sending a message to
+
+ majordomo@greatcircle.com
+
+With in the body (not subject): subscribe firewalls.
+
+5.2 - Related software
+----------------------
+
+Network daemons etc. with enhanced logging capabilities can generate
+massive amounts of information: our 150+ workstations generate several
+hundred kbytes each day. egrep-based filters can help to suppress some
+of the noise. A more powerful tool is the Swatch monitoring system by
+Stephen E. Hansen and E. Todd Atkins. Swatch can process log files in
+real time and can associate arbitrary actions with patterns; its
+applications are by no means restricted to security. Swatch is
+available ftp.stanford.edu, directory /general/security-tools/swatch.
+
+Socks, described in the UNIX Security III proceedings, can be used to
+control network traffic from hosts on an internal network, through a
+firewall host, to the outer world. Socks consists of a daemon that is
+run on the firewall host, and of a library with routines that redirect
+application socket calls through the firewall daemon. Socks is
+available from s1.gov in /pub/firewalls/socks.tar.Z.
+
+For a modified Socks version by Ying-Da Lee (ylee@syl.dl.nec.com) try
+ftp.nec.com, directory /pub/security/socks.cstc.
+
+Tcpr is a set of perl scripts by Paul Ziemba that enable you to run ftp
+and telnet commands across a firewall. Unlike socks it can be used with
+unmodified client software. Available from ftp.alantec.com, /pub/tcpr.
+
+The TIS firewall toolkit provides a multitude of tools to build your
+own internet firewall system. ftp.tis.com, directory /pub/firewalls.
+
+Versions of rshd and rlogind, modified to report the client user name
+in addition to the client host name, are available for anonymous ftp
+(ftp.win.tue.nl:/pub/security/logdaemon-XX.tar.Z). These programs are
+drop-in replacements for SunOS 4.x, Ultrix 4.x, SunOS 5.x and HP-UX
+9.x. This archive also contains ftpd/rexecd/login versions that support
+S/Key or SecureNet one-time passwords in addition to traditional UNIX
+reusable passwords.
+
+The securelib shared library by William LeFebvre can be used to control
+access to network daemons that are not run under control of the inetd
+or that serve more than one client, such as the NFS mount daemon that
+runs until the machine goes down. Available from eecs.nwu.edu, file
+/pub/securelib.tar.
+
+xinetd (posted to comp.sources.unix) is an inetd replacement that
+provides, among others, logging, username lookup and access control.
+However, it does not support the System V TLI services, and involves
+much more source code than the daemon wrapper programs. Available
+from ftp.uu.net, directory /usenet/comp.sources.unix.
+
+netlog from Texas A&M relies on the SunOS 4.x /dev/nit interface to
+passively watch all TCP and UDP network traffic on a network. The
+current version is on net.tamu.edu in /pub/security/TAMU.
+
+Where shared libraries or router-based packet filtering are not an
+option, an alternative portmap daemon can help to prevent hackers
+from mounting your NFS file systems using the proxy RPC facility.
+ftp.win.tue.nl:/pub/security/portmap-X.shar.Z was tested with SunOS
+4.1.X Ultrix 3.0 and Ultrix 4.x, HP-UX 8.x and some version of AIX. The
+protection is less effective than that of the securelib library because
+portmap is mostly a dictionary service.
+
+An rpcbind replacement (the Solaris 2.x moral equivalent of portmap)
+can be found on ftp.win.tue.nl in /pub/security. It prevents hackers
+from mounting your NFS file systems by using the proxy RPC facility.
+
+Source for a portable RFC 931 (TAP, IDENT, RFC 1413) daemon by Peter
+Eriksson is available from ftp.lysator.liu.se:/pub/ident/servers.
+
+Some TCP/IP implementations come without syslog library. Some come with
+the library but have no syslog daemon. A replacement can be found in
+ftp.win.tue.nl:/pub/security/surrogate-syslog.tar.Z. The fakesyslog
+library that comes with the nntp sources reportedly works well, too.
+
+6 - Limitations
+---------------
+
+6.1 - Known wrapper limitations
+-------------------------------
+
+Many UDP (and rpc/udp) daemons linger around for a while after they
+have serviced a request, just in case another request comes in. In the
+inetd configuration file these daemons are registered with the `wait'
+option. Only the request that started such a daemon will be seen by the
+wrappers. Such daemons are better protected with the securelib shared
+library (see: Related software).
+
+The wrappers do not work with RPC services over TCP. These services are
+registered as rpc/tcp in the inetd configuration file. The only non-
+trivial service that is affected by this limitation is rexd, which is
+used by the on(1) command. This is no great loss. On most systems,
+rexd is less secure than a wildcard in /etc/hosts.equiv.
+
+Some RPC requests (for example: rwall, rup, rusers) appear to come from
+the server host. What happens is that the client broadcasts its request
+to all portmap daemons on its network; each portmap daemon forwards the
+request to a daemon on its own system. As far as the rwall etc. daemons
+know, the request comes from the local host.
+
+Portmap and RPC (e.g. NIS and NFS) (in)security is a topic in itself.
+See the section in this document on related software.
+
+6.2 - Known system software bugs
+--------------------------------
+
+Workarounds have been implemented for several bugs in system software.
+They are described in the Makefile. Unfortunately, some system software
+bugs cannot be worked around. The result is loss of functionality.
+
+IRIX has so many bugs that it has its own README.IRIX file.
+
+Older ConvexOS versions come with a broken recvfrom(2) implementation.
+This makes it impossible for the daemon wrappers to look up the
+client host address (and hence, the name) in case of UDP requests.
+A patch is available for ConvexOS 10.1; later releases should be OK.
+
+With early Solaris (SunOS 5) versions, the syslog daemon will leave
+behind zombie processes when writing to logged-in users. Workaround:
+increase the syslogd threshold for logging to users, or reduce the
+wrapper's logging severity.
+
+On some systems, the optional RFC 931 etc. client username lookups may
+trigger a kernel bug. When a client host connects to your system, and
+the RFC 931 connection from your system to that client is rejected by a
+router, your kernel may drop all connections with that client. This is
+not a bug in the wrapper programs: complain to your vendor, and don't
+enable client user name lookups until the bug has been fixed.
+
+Reportedly, SunOS 4.1.1, Next 2.0a, ISC 3.0 with TCP 1.3, and AIX 3.2.2
+and later are OK.
+
+Sony News/OS 4.51, HP-UX 8-something and Ultrix 4.3 still have the bug.
+Reportedly, a fix for Ultrix is available (CXO-8919).
+
+The following procedure can be used (from outside the tue.nl domain) to
+find out if your kernel has the bug. From the system under test, do:
+
+ % ftp 131.155.70.19
+
+This command attempts to make an ftp connection to our anonymous ftp
+server (ftp.win.tue.nl). When the connection has been established, run
+the following command from the same system under test, while keeping
+the ftp connection open:
+
+ % telnet 131.155.70.19 111
+
+Do not forget the `111' at the end of the command. This telnet command
+attempts to connect to our portmap process. The telnet command should
+fail with: "host not reachable", or with a timeout error. If your ftp
+connection gets messed up, you have the bug. If the telnet command does
+not fail, please let me know a.s.a.p.!
+
+For those who care, the bug is that the BSD kernel code was not careful
+enough with incoming ICMP UNREACHABLE control messages (it ignored the
+local and remote port numbers, and therefore zapped *all* connections
+with the remote system). The bug is still present in the BSD NET/1
+source release (1989) but apparently has been fixed in BSD NET/2 (1991).
+
+7 - Configuration and installation
+----------------------------------
+
+7.1 - Easy configuration and installation
+-----------------------------------------
+
+The "easy" recipe requires no changes to existing software or
+configuration files. Basically, you move the daemons that you want to
+protect to a different directory and plug the resulting holes with
+copies of the wrapper programs.
+
+If you don't run Ultrix, you won't need the miscd wrapper program. The
+miscd daemon implements among others the SYSTAT service, which produces
+the same output as the WHO command.
+
+Type `make' and follow the instructions. The Makefile comes with
+ready-to-use templates for many common UNIX implementations (sun,
+ultrix, hp-ux, aix, irix,...).
+
+IRIX has so many bugs that it has its own README.IRIX file.
+
+When the `make' succeeds the result is five executables (six in case of
+Ultrix).
+
+You can use the `tcpdchk' program to identify the most common problems
+in your wrapper and inetd configuration files.
+
+With the `tcpdmatch' program you can examine how the wrapper would
+react to specific requests for service.
+
+The `safe_finger' command should be used when you implement booby
+traps: it gives better protection against nasty stuff that remote
+hosts may do in response to your finger probes.
+
+The `try-from' program tests the host and username lookup code. Run it
+from a remote shell command (`rsh host /some/where/try-from') and it
+should be able to figure out from what system it is being called.
+
+The tcpd program can be used to monitor the telnet, finger, ftp, exec,
+rsh, rlogin, tftp, talk, comsat and other tcp or udp services that have
+a one-to-one mapping onto executable files.
+
+The tcpd program can also be used for services that are marked as
+rpc/udp in the inetd configuration file, but not for rpc/tcp services
+such as rexd. You probably do not want to run rexd anyway. On most
+systems it is even less secure than a wildcard in /etc/hosts.equiv.
+
+With System V.4-style systems, the tcpd program can also handle TLI
+services. When TCP/IP or UDP/IP is used underneath TLI, tcpd provides
+the same functions as with socket-based applications. When some other
+protocol is used underneath TLI, functionality will be limited (no
+client username lookups, weird network address formats).
+
+Decide which services you want to monitor. Move the corresponding
+vendor-provided daemon programs to the location specified by the
+REAL_DAEMON_DIR constant in the Makefile, and fill the holes with
+copies of the tcpd program. That is, one copy of (or link to) the tcpd
+program for each service that you want to monitor. For example, to
+monitor the use of your finger service:
+
+ # mkdir REAL_DAEMON_DIR
+ # mv /usr/etc/in.fingerd REAL_DAEMON_DIR
+ # cp tcpd /usr/etc/in.fingerd
+
+The example applies to SunOS 4. With other UNIX implementations the
+network daemons live in /usr/libexec, /usr/sbin or in /etc, or have no
+"in." prefix to their names, but you get the idea.
+
+File protections: the wrapper, all files used by the wrapper, and all
+directories in the path leading to those files, should be accessible
+but not writable for unprivileged users (mode 755 or mode 555). Do not
+install the wrapper set-uid.
+
+Ultrix only: If you want to monitor the SYSTAT service, move the
+vendor-provided miscd daemon to the location specified by the
+REAL_DAEMON_DIR macro in the Makefile, and install the miscd wrapper
+at the original miscd location.
+
+In the absence of any access-control tables, the daemon wrappers
+will just maintain a record of network connections made to your system.
+
+7.2 - Advanced configuration and installation
+---------------------------------------------
+
+The advanced recipe leaves your daemon executables alone, but involves
+simple modifications to the inetd configuration file.
+
+Type `make' and follow the instructions. The Makefile comes with
+ready-to-use templates for many common UNIX implementations (sun,
+ultrix, hp-ux, aix, irix, ...).
+
+IRIX users should read the warnings in the README.IRIX file first.
+
+When the `make' succeeds the result is five executables (six in case of
+Ultrix).
+
+You can use the `tcpdchk' program to identify the most common problems
+in your wrapper and inetd configuration files.
+
+With the `tcpdmatch' program you can examine how the wrapper would
+react to specific requests for service.
+
+The `try-from' program tests the host and username lookup code. Run it
+from a remote shell command (`rsh host /some/where/try-from') and it
+should be able to figure out from what system it is being called.
+
+The `safe_finger' command should be used when you implement a booby
+trap: it gives better protection against nasty stuff that remote hosts
+may do in response to your finger probes.
+
+The tcpd program can be used to monitor the telnet, finger, ftp, exec,
+rsh, rlogin, tftp, talk, comsat and other tcp or udp services that have
+a one-to-one mapping onto executable files.
+
+With System V.4-style systems, the tcpd program can also handle TLI
+services. When TCP/IP or UDP/IP is used underneath TLI, tcpd provides
+the same functions as with socket-based applications. When some other
+protocol is used underneath TLI, functionality will be limited (no
+client username lookups, weird network address formats).
+
+The tcpd program can also be used for services that are marked as
+rpc/udp in the inetd configuration file, but not for rpc/tcp services
+such as rexd. You probably do not want to run rexd anyway. On most
+systems it is even less secure than a wildcard in /etc/hosts.equiv.
+
+Install the tcpd command in a suitable place. Apollo UNIX users will
+want to install it under a different name because the name "tcpd" is
+already taken; a suitable name would be "frontd".
+
+File protections: the wrapper, all files used by the wrapper, and all
+directories in the path leading to those files, should be accessible
+but not writable for unprivileged users (mode 755 or mode 555). Do not
+install the wrapper set-uid.
+
+Then perform the following edits on the inetd configuration file
+(usually /etc/inetd.conf or /etc/inet/inetd.conf):
+
+ finger stream tcp nowait nobody /usr/etc/in.fingerd in.fingerd
+ ^^^^^^^^^^^^^^^^^^^
+becomes:
+
+ finger stream tcp nowait nobody /usr/etc/tcpd in.fingerd
+ ^^^^^^^^^^^^^
+Send a `kill -HUP' to the inetd process to make the change effective.
+Some IRIX inetd implementations require that you first disable the
+finger service (comment out the finger service and `kill -HUP' the
+inetd) before you can turn on the modified version. Sending a HUP
+twice seems to work just as well for IRIX 5.3, 6.0, 6.0.1 and 6.1.
+
+AIX note: you may have to execute the `inetimp' command after changing
+the inetd configuration file.
+
+The example applies to SunOS 4. With other UNIX implementations the
+network daemons live in /usr/libexec, /usr/sbin, or /etc, the network
+daemons have no "in." prefix to their names, or the username field in
+the inetd configuration file may be missing.
+
+When the finger service works as expected you can perform similar
+changes for other network services. Do not forget the `kill -HUP'.
+
+The miscd daemon that comes with Ultrix implements several network
+services. It decides what to do by looking at its process name. One of
+the services is systat, which is a kind of limited finger service. If
+you want to monitor the systat service, install the miscd wrapper in a
+suitable place and update the inetd configuration file:
+
+ systat stream tcp nowait /suitable/place/miscd systatd
+
+Ultrix 4.3 allows you to specify a user id under which the daemon will
+be executed. This feature is not documented in the manual pages. Thus,
+the example would become:
+
+ systat stream tcp nowait nobody /suitable/place/miscd systatd
+
+Older Ultrix systems still run all their network daemons as root.
+
+In the absence of any access-control tables, the daemon wrappers
+will just maintain a record of network connections made to your system.
+
+7.3 - Daemons with arbitrary path names
+---------------------------------------
+
+The above tcpd examples work fine with network daemons that live in a
+common directory, but sometimes that is not practical. Having soft
+links all over your file system is not a clean solution, either.
+
+Instead you can specify, in the inetd configuration file, an absolute
+path name for the daemon process name. For example,
+
+ ntalk dgram udp wait root /usr/etc/tcpd /usr/local/lib/ntalkd
+
+When the daemon process name is an absolute path name, tcpd ignores the
+value of the REAL_DAEMON_DIR constant, and uses the last path component
+of the daemon process name for logging and for access control.
+
+7.4 - Building and testing the access control rules
+---------------------------------------------------
+
+In order to support access control the wrappers must be compiled with
+the -DHOSTS_ACCESS option. The access control policy is given in the
+form of two tables (default: /etc/hosts.allow and /etc/hosts.deny).
+Access control is disabled when there are no access control tables, or
+when the tables are empty.
+
+If you haven't used the wrappers before I recommend that you first run
+them a couple of days without any access control restrictions. The
+logfile records should give you an idea of the process names and of the
+host names that you will have to build into your access control rules.
+
+The syntax of the access control rules is documented in the file
+hosts_access.5, which is in `nroff -man' format. This is a lengthy
+document, and no-one expects you to read it right away from beginning
+to end. Instead, after reading the introductory section, skip to the
+examples at the end so that you get a general idea of the language.
+Then you can appreciate the detailed reference sections near the
+beginning of the document.
+
+The examples in the hosts_access.5 document (`nroff -man' format) show
+two specific types of access control policy: 1) mostly closed (only
+permitting access from a limited number of systems) and 2) mostly open
+(permitting access from everyone except a limited number of trouble
+makers). You will have to choose what model suits your situation best.
+Implementing a mixed policy should not be overly difficult either.
+
+Optional extensions to the access control language are described in the
+hosts_options.5 document (`nroff -man' format).
+
+The `tcpdchk' program examines all rules in your access control files
+and reports any problems it can find. `tcpdchk -v' writes to standard
+output a pretty-printed list of all rules. `tcpdchk -d' examines the
+hosts.access and hosts.allow files in the current directory. This
+program is described in the tcpdchk.8 document (`nroff -man' format).
+
+The `tcpdmatch' command can be used to try out your local access
+control files. The command syntax is:
+
+ tcpdmatch process_name hostname (e.g.: tcpdmatch in.tftpd localhost)
+
+ tcpdmatch process_name address (e.g.: tcpdmatch in.tftpd 127.0.0.1)
+
+This way you can simulate what decisions will be made, and what actions
+will be taken, when hosts connect to your own system. The program is
+described in the tcpdmatch.8 document (`nroff -man' format).
+
+Note 1: `tcpdmatch -d' will look for hosts.{allow,deny} tables in the
+current working directory. This is useful for testing new rules without
+bothering your users.
+
+Note 2: you cannot use the `tcpdmatch' command to simulate what happens
+when the local system connects to other hosts.
+
+In order to find out what process name to use, just use the service and
+watch the process name that shows up in the logfile. Alternatively,
+you can look up the name from the inetd configuration file. Coming back
+to the tftp example in the tutorial section above:
+
+ tftp dgram udp wait root /usr/etc/tcpd in.tftpd -s /tftpboot
+
+This entry causes the inetd to run the wrapper program (tcpd) with a
+process name `in.tftpd'. This is the name that the wrapper will use
+when scanning the access control tables. Therefore, `in.tftpd' is the
+process name that should be given to the `tcpdmatch' command. On your
+system the actual inetd.conf entry may differ (tftpd instead of
+in.tftpd, and no `root' field), but you get the idea.
+
+When you specify a host name, the `tcpdmatch' program will use both the
+host name and address. This way you can simulate the most common case
+where the wrappers know both the host address and the host name. The
+`tcpdmatch' program will iterate over all addresses that it can find
+for the given host name.
+
+When you specify a host address instead of a host name, the `tcpdmatch'
+program will pretend that the host name is unknown, so that you can
+simulate what happens when the wrapper is unable to look up the client
+host name.
+
+7.5 - Other applications
+------------------------
+
+The access control routines can easily be integrated with other
+programs. The hosts_access.3 manual page (`nroff -man' format)
+describes the external interface of the libwrap.a library.
+
+The tcpd program can even be used to control access to the mail
+service. This can be useful when you suspect that someone is trying
+out some obscure sendmail bug, or when a remote site is misconfigured
+and keeps hammering your mail daemon.
+
+In that case, sendmail should not be run as a stand-alone network
+listener, but it should be registered in the inetd configuration file.
+For example:
+
+ smtp stream tcp nowait root /usr/etc/tcpd /usr/lib/sendmail -bs
+
+You will still need to run one sendmail background process to handle
+queued-up outgoing mail. A command like:
+
+ /usr/lib/sendmail -q15m
+
+(no `-bd' flag) should take care of that. You cannot really prevent
+people from posting forged mail this way, because there are many
+unprotected smtp daemons on the network.
+
+8 - Acknowledgements
+--------------------
+
+Many people contributed to the evolution of the programs, by asking
+inspiring questions, by suggesting features or bugfixes, or by
+submitting source code. Nevertheless, all mistakes and bugs in the
+wrappers are my own.
+
+Thanks to Brendan Kehoe (cs.widener.edu), Heimir Sverrisson (hafro.is)
+and Dan Bernstein (kramden.acf.nyu.edu) for feedback on an early
+release of this product. The host name/address check was suggested by
+John Kimball (src.honeywell.com). Apollo's UNIX environment has some
+peculiar quirks: Willem-Jan Withagen (eb.ele.tue.nl), Pieter
+Schoenmakers (es.ele.tue.nl) and Charles S. Fuller (wccs.psc.edu)
+provided assistance. Hal R. Brand (addvax.llnl.gov) told me how to
+get the client IP address in case of datagram-oriented services, and
+suggested the optional shell command feature. Shabbir Safdar
+(mentor.cc.purdue.edu) provided a first version of a much-needed manual
+page. Granville Boman Goza, IV (sei.cmu.edu) suggested to use the
+client IP address even when the host name is available. Casper H.S.
+Dik (fwi.uva.nl) provided additional insight into DNS spoofing
+techniques. The bogus daemon feature was inspired by code from Andrew
+Macpherson (BNR Europe Ltd). Steve Bellovin (research.att.com)
+confirmed some of my suspicions about the darker sides of TCP/IP
+insecurity. Risks of automated fingers were pointed out by Borja Marcos
+(we.lc.ehu.es). Brad Plecs (jhuspo.ca.jhu.edu) was kind enough to try
+my early TLI code and to work out how DG/UX differs from Solaris.
+
+John P. Rouillard (cs.umb.edu) deserves special mention for his
+persistent, but constructive, nagging about wrong or missing things,
+and for trying out and discussing embryonic code or ideas.
+
+Last but not least, Howard Chu (hanauma.jpl.nasa.gov), Darren Reed
+(coombs.anu.edu.au), Icarus Sparry (gdr.bath.ac.uk), Scott Schwartz
+(cs.psu.edu), John A. Kunze (violet.berkeley.edu), Daniel Len Schales
+(engr.latech.edu), Chris Turbeville (cse.uta.edu), Paul Kranenburg
+(cs.few.eur.nl), Marc Boucher (cam.org), Dave Mitchell
+(dcs.shef.ac.uk), Andrew Maffei, Adrian van Bloois, Rop Gonggrijp, John
+C. Wingenbach, Everett F. Batey and many, many others provided fixes,
+code fragments, or ideas for improvements.
+
+ Wietse Venema (wietse@wzv.win.tue.nl)
+ Department of Mathematics and Computing Science
+ Eindhoven University of Technology
+ P.O. Box 513
+ 5600 MB Eindhoven
+ The Netherlands
+
+ Currently visiting IBM T.J. Watson Research, Hawthorne NY, USA.
diff --git a/contrib/tcp_wrappers/README.IRIX b/contrib/tcp_wrappers/README.IRIX
new file mode 100644
index 000000000000..56d2beafaaab
--- /dev/null
+++ b/contrib/tcp_wrappers/README.IRIX
@@ -0,0 +1,54 @@
+@(#) README.IRIX 1.2 94/12/28 18:45:58
+
+In the past few months I received several messages with questions from
+people that tried to use my tcp wrapper on IRIX 5.x. Some mysteries
+could be solved via email, and then some remained.
+
+Today I finally had a chance to do some tests on someones IRIX 5.2
+system. Here is my first-hand experience with wrapper release 6.3.
+
+(1) Inetd is broken. Normally one edits inetd.conf, sends a HUP signal
+ to inetd and that's it. With IRIX evil things happen: inetd is too
+ stupid to remember that it is already listening on a port.
+
+ In order to modify an entry in inetd.conf, first comment it out
+ with a # at the beginning of the line, kill -HUP the inetd, then
+ uncomment the inetd.conf entry and kill -HUP again.
+
+ Even with this amount of care I have seen inetd messing up, like
+ calling rusersd when I make a talk connection. Even killing and
+ restarting inetd does not solve all problems.
+
+ I find it hard to believe, it but the best thing to do with IRIX is
+ to reboot after changing inetd.conf.
+
+(2) When tcpd is built according to the irix4 Makefile rules, it
+ appears to work as expected with TCP-based services such as
+ fingerd, and with UDP-based services such as ntalk and tftp.
+
+(3) It does NOT work with RPC over UDP services such as rusersd and
+ rstatd: the wrapper hangs in the recvfrom() system call, and I
+ have spent several hours looking for ways to work around it. No
+ way. After finding that none of the applicable socket primitives
+ can be made to work (recvfrom recvmsg) I give up. So, the IRIX RPC
+ services cannot be wrapped until SGI fixes their system so that it
+ works like everyone elses code (HP Sun Dec AIX and so on).
+
+(4) I didn't even bother to try the RPC over TCP services.
+
+(5) When an IRIX 5.2 system is a NIS client, it can have problems with
+ hosts that have more than one address: the wrapper will see only
+ one address, and may complain when PARANOID mode is on. The fix is
+ to change the name service lookup order in /etc/resolv.conf so that
+ your system tries DNS before NIS (hostresorder bind nis local).
+
+(6) IRIX 5.2 is not System V.4, and it shows. Do not link with the
+ -lsocket and -lnsl libraries. They are completely broken, and the
+ wrapper will be unable to figure out the client internet address.
+ So, TLI services cannot be wrapped until SGI fixes their system so
+ that it works the way it is supposed to.
+
+I am not impressed by the quality of the IRIX system software. There
+are many things that work on almost every other system except with IRIX.
+
+ Wietse
diff --git a/contrib/tcp_wrappers/README.NIS b/contrib/tcp_wrappers/README.NIS
new file mode 100644
index 000000000000..34d39e27cf13
--- /dev/null
+++ b/contrib/tcp_wrappers/README.NIS
@@ -0,0 +1,207 @@
+@(#) README.NIS 1.2 96/02/11 17:24:52
+
+> Problem: I have several [machines] with multiple IP addresses, and
+> when they try to connect to a daemon with tcp wrapper, they are often
+> rejected. I assume this is due to the -DPARANOID option, and depends
+> on which IP address is returned first from the nameserver for a given
+> name. This behavior seems to be random, may depend on ordering in
+> the YP host map?
+
+[Note: the situation described below no longer exists. Presently, my
+internet gateway uses the same IP address on all interfaces. To avoid
+confusion I have removed the old name wzv-gw.win.tue.nl from the DNS. I
+have kept the discussion below for educational reasons].
+
+NIS was not designed to handle multi-homed hosts. With NIS, each
+address should have its own hostname. For example, wzv-gw is my
+gateway. It has two interfaces: one connected to the local ethernet,
+the other to a serial link. In the NIS it is registered as:
+
+ 131.155.210.23 wzv-gw-ether
+ 131.155.12.78 wzv-gw-slip
+
+In principle, wzv-gw could be the official name of one of these
+interfaces, or it could be an alias for both.
+
+The DNS was designed to handle multi-homed hosts. In the DNS my gateway
+is registered in zone win.tue.nl, with one name that has two A records:
+
+ wzv-gw IN A 131.155.210.23
+ IN A 131.155.12.78
+
+And of course there are PTR records in zones 210.155.131.in-addr.arpa
+and 12.155.131.in-addr.arpa that point to wzv-gw.win.tue.nl.
+
+This setup does not cause any problems. You can test your name service
+with the two programs below. This is what they say on a local NIS client
+(both client and server running SunOS 4.1.3_U1):
+
+ % gethostbyname wzv-gw
+ Hostname: wzv-gw.win.tue.nl
+ Aliases:
+ Addresses: 131.155.210.23 131.155.12.78
+
+ % gethostbyaddr 131.155.210.23
+ Hostname: wzv-gw-ether
+ Aliases:
+ Addresses: 131.155.210.23
+
+ % gethostbyaddr 131.155.12.78
+ Hostname: wzv-gw-slip
+ Aliases:
+ Addresses: 131.155.12.78
+
+Things seem less confusing when seen by a NIS client in a different
+domain (both client and server running SunOS 4.1.3_U1):
+
+ % gethostbyname wzv-gw.win.tue.nl
+ Hostname: wzv-gw.win.tue.nl
+ Aliases:
+ Addresses: 131.155.210.23 131.155.12.78
+
+ % gethostbyaddr 131.155.210.23
+ Hostname: wzv-gw.win.tue.nl
+ Aliases:
+ Addresses: 131.155.12.78 131.155.210.23
+
+ % gethostbyaddr 131.155.12.78
+ Hostname: wzv-gw.win.tue.nl
+ Aliases:
+ Addresses: 131.155.210.23 131.155.12.78
+
+Alas, Solaris 2.4 still has problems. This is what I get on a Solaris
+2.4 NIS client, with a SunOS 4.1.3_U1 NIS server:
+
+ % gethostbyname wzv-gw.win.tue.nl
+ Hostname: wzv-gw.win.tue.nl
+ Aliases: 131.155.210.23 wzv-gw.win.tue.nl
+ Addresses: 131.155.12.78
+
+The tcpd source comes with a workaround for this problem. The
+workaround is ugly and is not part of the programs attached below.
+
+
+#! /bin/sh
+# This is a shell archive. Remove anything before this line, then unpack
+# it by saving it into a file and typing "sh file". To overwrite existing
+# files, type "sh file -c". You can also feed this as standard input via
+# unshar, or by typing "sh <file", e.g.. If this archive is complete, you
+# will see the following message at the end:
+# "End of shell archive."
+# Contents: gethostbyaddr.c gethostbyname.c
+# Wrapped by wietse@wzv on Sun Jan 8 17:08:48 1995
+PATH=/bin:/usr/bin:/usr/ucb ; export PATH
+if test -f gethostbyaddr.c -a "${1}" != "-c" ; then
+ echo shar: Will not over-write existing file \"gethostbyaddr.c\"
+else
+echo shar: Extracting \"gethostbyaddr.c\" \(1073 characters\)
+sed "s/^X//" >gethostbyaddr.c <<'END_OF_gethostbyaddr.c'
+X /*
+X * gethostbyaddr tester. compile with:
+X *
+X * cc -o gethostbyaddr gethostbyaddr.c (SunOS 4.x)
+X *
+X * cc -o gethostbyaddr gethostbyaddr.c -lnsl (SunOS 5.x)
+X *
+X * run as: gethostbyaddr address
+X *
+X * Author: Wietse Venema, Eindhoven University of Technology, The Netherlands.
+X */
+X
+X#include <sys/types.h>
+X#include <sys/socket.h>
+X#include <netinet/in.h>
+X#include <arpa/inet.h>
+X#include <netdb.h>
+X#include <stdio.h>
+X
+Xmain(argc, argv)
+Xint argc;
+Xchar **argv;
+X{
+X struct hostent *hp;
+X long addr;
+X
+X if (argc != 2) {
+X fprintf(stderr, "usage: %s i.p.addres\n", argv[0]);
+X exit(1);
+X }
+X addr = inet_addr(argv[1]);
+X if (hp = gethostbyaddr((char *) &addr, sizeof(addr), AF_INET)) {
+X printf("Hostname:\t%s\n", hp->h_name);
+X printf("Aliases:\t");
+X while (hp->h_aliases[0])
+X printf("%s ", *hp->h_aliases++);
+X printf("\n");
+X printf("Addresses:\t");
+X while (hp->h_addr_list[0])
+X printf("%s ", inet_ntoa(*(struct in_addr *) * hp->h_addr_list++));
+X printf("\n");
+X exit(0);
+X }
+X fprintf(stderr, "host %s not found\n", argv[1]);
+X exit(1);
+X}
+END_OF_gethostbyaddr.c
+if test 1073 -ne `wc -c <gethostbyaddr.c`; then
+ echo shar: \"gethostbyaddr.c\" unpacked with wrong size!
+fi
+# end of overwriting check
+fi
+if test -f gethostbyname.c -a "${1}" != "-c" ; then
+ echo shar: Will not over-write existing file \"gethostbyname.c\"
+else
+echo shar: Extracting \"gethostbyname.c\" \(999 characters\)
+sed "s/^X//" >gethostbyname.c <<'END_OF_gethostbyname.c'
+X /*
+X * gethostbyname tester. compile with:
+X *
+X * cc -o gethostbyname gethostbyname.c (SunOS 4.x)
+X *
+X * cc -o gethostbyname gethostbyname.c -lnsl (SunOS 5.x)
+X *
+X * run as: gethostbyname hostname
+X *
+X * Author: Wietse Venema, Eindhoven University of Technology, The Netherlands.
+X */
+X#include <sys/types.h>
+X#include <sys/socket.h>
+X#include <netinet/in.h>
+X#include <arpa/inet.h>
+X#include <netdb.h>
+X#include <stdio.h>
+X
+Xmain(argc, argv)
+Xint argc;
+Xchar **argv;
+X{
+X struct hostent *hp;
+X
+X if (argc != 2) {
+X fprintf(stderr, "usage: %s hostname\n", argv[0]);
+X exit(1);
+X }
+X if (hp = gethostbyname(argv[1])) {
+X printf("Hostname:\t%s\n", hp->h_name);
+X printf("Aliases:\t");
+X while (hp->h_aliases[0])
+X printf("%s ", *hp->h_aliases++);
+X printf("\n");
+X printf("Addresses:\t");
+X while (hp->h_addr_list[0])
+X printf("%s ", inet_ntoa(*(struct in_addr *) * hp->h_addr_list++));
+X printf("\n");
+X exit(0);
+X } else {
+X fprintf(stderr, "host %s not found\n", argv[1]);
+X exit(1);
+X }
+X}
+END_OF_gethostbyname.c
+if test 999 -ne `wc -c <gethostbyname.c`; then
+ echo shar: \"gethostbyname.c\" unpacked with wrong size!
+fi
+# end of overwriting check
+fi
+echo shar: End of shell archive.
+exit 0
diff --git a/contrib/tcp_wrappers/clean_exit.c b/contrib/tcp_wrappers/clean_exit.c
new file mode 100644
index 000000000000..cb9d4f5080d9
--- /dev/null
+++ b/contrib/tcp_wrappers/clean_exit.c
@@ -0,0 +1,42 @@
+ /*
+ * clean_exit() cleans up and terminates the program. It should be called
+ * instead of exit() when for some reason the real network daemon will not or
+ * cannot be run. Reason: in the case of a datagram-oriented service we must
+ * discard the not-yet received data from the client. Otherwise, inetd will
+ * see the same datagram again and again, and go into a loop.
+ *
+ * Author: Wietse Venema, Eindhoven University of Technology, The Netherlands.
+ */
+
+#ifndef lint
+static char sccsid[] = "@(#) clean_exit.c 1.4 94/12/28 17:42:19";
+#endif
+
+#include <stdio.h>
+
+extern void exit();
+
+#include "tcpd.h"
+
+/* clean_exit - clean up and exit */
+
+void clean_exit(request)
+struct request_info *request;
+{
+
+ /*
+ * In case of unconnected protocols we must eat up the not-yet received
+ * data or inetd will loop.
+ */
+
+ if (request->sink)
+ request->sink(request->fd);
+
+ /*
+ * Be kind to the inetd. We already reported the problem via the syslogd,
+ * and there is no need for additional garbage in the logfile.
+ */
+
+ sleep(5);
+ exit(0);
+}
diff --git a/contrib/tcp_wrappers/diag.c b/contrib/tcp_wrappers/diag.c
new file mode 100644
index 000000000000..e0bd792c319d
--- /dev/null
+++ b/contrib/tcp_wrappers/diag.c
@@ -0,0 +1,69 @@
+ /*
+ * Routines to report various classes of problems. Each report is decorated
+ * with the current context (file name and line number), if available.
+ *
+ * tcpd_warn() reports a problem and proceeds.
+ *
+ * tcpd_jump() reports a problem and jumps.
+ *
+ * Author: Wietse Venema, Eindhoven University of Technology, The Netherlands.
+ */
+
+#ifndef lint
+static char sccsid[] = "@(#) diag.c 1.1 94/12/28 17:42:20";
+#endif
+
+/* System libraries */
+
+#include <syslog.h>
+#include <stdio.h>
+#include <setjmp.h>
+
+/* Local stuff */
+
+#include "tcpd.h"
+#include "mystdarg.h"
+
+struct tcpd_context tcpd_context;
+jmp_buf tcpd_buf;
+
+/* tcpd_diag - centralize error reporter */
+
+static void tcpd_diag(severity, tag, format, ap)
+int severity;
+char *tag;
+char *format;
+va_list ap;
+{
+ char fmt[BUFSIZ];
+
+ if (tcpd_context.file)
+ sprintf(fmt, "%s: %s, line %d: %s",
+ tag, tcpd_context.file, tcpd_context.line, format);
+ else
+ sprintf(fmt, "%s: %s", tag, format);
+ vsyslog(severity, fmt, ap);
+}
+
+/* tcpd_warn - report problem of some sort and proceed */
+
+void VARARGS(tcpd_warn, char *, format)
+{
+ va_list ap;
+
+ VASTART(ap, char *, format);
+ tcpd_diag(LOG_ERR, "warning", format, ap);
+ VAEND(ap);
+}
+
+/* tcpd_jump - report serious problem and jump */
+
+void VARARGS(tcpd_jump, char *, format)
+{
+ va_list ap;
+
+ VASTART(ap, char *, format);
+ tcpd_diag(LOG_ERR, "error", format, ap);
+ VAEND(ap);
+ longjmp(tcpd_buf, AC_ERROR);
+}
diff --git a/contrib/tcp_wrappers/environ.c b/contrib/tcp_wrappers/environ.c
new file mode 100644
index 000000000000..e7f846ddd6b7
--- /dev/null
+++ b/contrib/tcp_wrappers/environ.c
@@ -0,0 +1,224 @@
+/*
+ * Many systems have putenv() but no setenv(). Other systems have setenv()
+ * but no putenv() (MIPS). Still other systems have neither (NeXT). This is a
+ * re-implementation that hopefully ends all problems.
+ *
+ * Author: Wietse Venema, Eindhoven University of Technology, The Netherlands.
+ */
+
+#ifndef lint
+static char sccsid[] = "@(#) environ.c 1.2 94/03/23 16:09:46";
+#endif
+
+/* System libraries. */
+
+extern char **environ;
+extern char *strchr();
+extern char *strcpy();
+extern char *strncpy();
+extern char *malloc();
+extern char *realloc();
+extern int strncmp();
+extern void free();
+
+#ifdef no_memcpy
+#define memcpy(d,s,l) bcopy(s,d,l)
+#else
+extern char *memcpy();
+#endif
+
+/* Local stuff. */
+
+static int addenv(); /* append entry to environment */
+
+static int allocated = 0; /* environ is, or is not, allocated */
+
+#define DO_CLOBBER 1
+
+/* namelength - determine length of name in "name=whatever" */
+
+static int namelength(name)
+char *name;
+{
+ char *equal;
+
+ equal = strchr(name, '=');
+ return ((equal == 0) ? strlen(name) : (equal - name));
+}
+
+/* findenv - given name, locate name=value */
+
+static char **findenv(name, len)
+char *name;
+int len;
+{
+ char **envp;
+
+ for (envp = environ; envp && *envp; envp++)
+ if (strncmp(name, *envp, len) == 0 && (*envp)[len] == '=')
+ return (envp);
+ return (0);
+}
+
+/* getenv - given name, locate value */
+
+char *getenv(name)
+char *name;
+{
+ int len = namelength(name);
+ char **envp = findenv(name, len);
+
+ return (envp ? *envp + len + 1 : 0);
+}
+
+/* putenv - update or append environment (name,value) pair */
+
+int putenv(nameval)
+char *nameval;
+{
+ char *equal = strchr(nameval, '=');
+ char *value = (equal ? equal : "");
+
+ return (setenv(nameval, value, DO_CLOBBER));
+}
+
+/* unsetenv - remove variable from environment */
+
+void unsetenv(name)
+char *name;
+{
+ char **envp;
+
+ if ((envp = findenv(name, namelength(name))) != 0)
+ while (envp[0] = envp[1])
+ envp++;
+}
+
+/* setenv - update or append environment (name,value) pair */
+
+int setenv(name, value, clobber)
+char *name;
+char *value;
+int clobber;
+{
+ char *destination;
+ char **envp;
+ int l_name; /* length of name part */
+ int l_nameval; /* length of name=value */
+
+ /* Permit name= and =value. */
+
+ l_name = namelength(name);
+ envp = findenv(name, l_name);
+ if (envp != 0 && clobber == 0)
+ return (0);
+ if (*value == '=')
+ value++;
+ l_nameval = l_name + strlen(value) + 1;
+
+ /*
+ * Use available memory if the old value is long enough. Never free an
+ * old name=value entry because it may not be allocated.
+ */
+
+ destination = (envp != 0 && strlen(*envp) >= l_nameval) ?
+ *envp : malloc(l_nameval + 1);
+ if (destination == 0)
+ return (-1);
+ strncpy(destination, name, l_name);
+ destination[l_name] = '=';
+ strcpy(destination + l_name + 1, value);
+ return ((envp == 0) ? addenv(destination) : (*envp = destination, 0));
+}
+
+/* cmalloc - malloc and copy block of memory */
+
+static char *cmalloc(new_len, old, old_len)
+char *old;
+int old_len;
+{
+ char *new = malloc(new_len);
+
+ if (new != 0)
+ memcpy(new, old, old_len);
+ return (new);
+}
+
+/* addenv - append environment entry */
+
+static int addenv(nameval)
+char *nameval;
+{
+ char **envp;
+ int n_used; /* number of environment entries */
+ int l_used; /* bytes used excl. terminator */
+ int l_need; /* bytes needed incl. terminator */
+
+ for (envp = environ; envp && *envp; envp++)
+ /* void */ ;
+ n_used = envp - environ;
+ l_used = n_used * sizeof(*envp);
+ l_need = l_used + 2 * sizeof(*envp);
+
+ envp = allocated ?
+ (char **) realloc((char *) environ, l_need) :
+ (char **) cmalloc(l_need, (char *) environ, l_used);
+ if (envp == 0) {
+ return (-1);
+ } else {
+ allocated = 1;
+ environ = envp;
+ environ[n_used++] = nameval; /* add new entry */
+ environ[n_used] = 0; /* terminate list */
+ return (0);
+ }
+}
+
+#ifdef TEST
+
+ /*
+ * Stand-alone program for test purposes.
+ */
+
+/* printenv - display environment */
+
+static void printenv()
+{
+ char **envp;
+
+ for (envp = environ; envp && *envp; envp++)
+ printf("%s\n", *envp);
+}
+
+int main(argc, argv)
+int argc;
+char **argv;
+{
+ char *cp;
+ int changed = 0;
+
+ if (argc < 2) {
+ printf("usage: %s name[=value]...\n", argv[0]);
+ return (1);
+ }
+ while (--argc && *++argv) {
+ if (argv[0][0] == '-') { /* unsetenv() test */
+ unsetenv(argv[0] + 1);
+ changed = 1;
+ } else if (strchr(argv[0], '=') == 0) { /* getenv() test */
+ cp = getenv(argv[0]);
+ printf("%s: %s\n", argv[0], cp ? cp : "not found");
+ } else { /* putenv() test */
+ if (putenv(argv[0])) {
+ perror("putenv");
+ return (1);
+ }
+ changed = 1;
+ }
+ }
+ if (changed)
+ printenv();
+ return (0);
+}
+
+#endif /* TEST */
diff --git a/contrib/tcp_wrappers/eval.c b/contrib/tcp_wrappers/eval.c
new file mode 100644
index 000000000000..d68358f3b9c3
--- /dev/null
+++ b/contrib/tcp_wrappers/eval.c
@@ -0,0 +1,136 @@
+ /*
+ * Routines for controlled evaluation of host names, user names, and so on.
+ * They are, in fact, wrappers around the functions that are specific for
+ * the sockets or TLI programming interfaces. The request_info and host_info
+ * structures are used for result cacheing.
+ *
+ * These routines allows us to postpone expensive operations until their
+ * results are really needed. Examples are hostname lookups and double
+ * checks, or username lookups. Information that cannot be retrieved is
+ * given the value "unknown" ("paranoid" in case of hostname problems).
+ *
+ * When ALWAYS_HOSTNAME is off, hostname lookup is done only when required by
+ * tcpd paranoid mode, by access control patterns, or by %letter expansions.
+ *
+ * When ALWAYS_RFC931 mode is off, user lookup is done only when required by
+ * access control patterns or %letter expansions.
+ *
+ * Author: Wietse Venema, Eindhoven University of Technology, The Netherlands.
+ */
+
+#ifndef lint
+static char sccsid[] = "@(#) eval.c 1.3 95/01/30 19:51:45";
+#endif
+
+/* System libraries. */
+
+#include <stdio.h>
+#include <string.h>
+
+/* Local stuff. */
+
+#include "tcpd.h"
+
+ /*
+ * When a string has the value STRING_UNKNOWN, it means: don't bother, I
+ * tried to look up the data but it was unavailable for some reason. When a
+ * host name has the value STRING_PARANOID it means there was a name/address
+ * conflict.
+ */
+char unknown[] = STRING_UNKNOWN;
+char paranoid[] = STRING_PARANOID;
+
+/* eval_user - look up user name */
+
+char *eval_user(request)
+struct request_info *request;
+{
+ if (request->user[0] == 0) {
+ strcpy(request->user, unknown);
+ if (request->sink == 0 && request->client->sin && request->server->sin)
+ rfc931(request->client->sin, request->server->sin, request->user);
+ }
+ return (request->user);
+}
+
+/* eval_hostaddr - look up printable address */
+
+char *eval_hostaddr(host)
+struct host_info *host;
+{
+ if (host->addr[0] == 0) {
+ strcpy(host->addr, unknown);
+ if (host->request->hostaddr != 0)
+ host->request->hostaddr(host);
+ }
+ return (host->addr);
+}
+
+/* eval_hostname - look up host name */
+
+char *eval_hostname(host)
+struct host_info *host;
+{
+ if (host->name[0] == 0) {
+ strcpy(host->name, unknown);
+ if (host->request->hostname != 0)
+ host->request->hostname(host);
+ }
+ return (host->name);
+}
+
+/* eval_hostinfo - return string with host name (preferred) or address */
+
+char *eval_hostinfo(host)
+struct host_info *host;
+{
+ char *hostname;
+
+#ifndef ALWAYS_HOSTNAME /* no implicit host lookups */
+ if (host->name[0] == 0)
+ return (eval_hostaddr(host));
+#endif
+ hostname = eval_hostname(host);
+ if (HOSTNAME_KNOWN(hostname)) {
+ return (host->name);
+ } else {
+ return (eval_hostaddr(host));
+ }
+}
+
+/* eval_client - return string with as much about the client as we know */
+
+char *eval_client(request)
+struct request_info *request;
+{
+ static char both[2 * STRING_LENGTH];
+ char *hostinfo = eval_hostinfo(request->client);
+
+#ifndef ALWAYS_RFC931 /* no implicit user lookups */
+ if (request->user[0] == 0)
+ return (hostinfo);
+#endif
+ if (STR_NE(eval_user(request), unknown)) {
+ sprintf(both, "%s@%s", request->user, hostinfo);
+ return (both);
+ } else {
+ return (hostinfo);
+ }
+}
+
+/* eval_server - return string with as much about the server as we know */
+
+char *eval_server(request)
+struct request_info *request;
+{
+ static char both[2 * STRING_LENGTH];
+ char *host = eval_hostinfo(request->server);
+ char *daemon = eval_daemon(request);
+
+ if (STR_NE(host, unknown)) {
+ sprintf(both, "%s@%s", daemon, host);
+ return (both);
+ } else {
+ return (daemon);
+ }
+}
diff --git a/contrib/tcp_wrappers/fakelog.c b/contrib/tcp_wrappers/fakelog.c
new file mode 100644
index 000000000000..fa9e06e1a20d
--- /dev/null
+++ b/contrib/tcp_wrappers/fakelog.c
@@ -0,0 +1,62 @@
+ /*
+ * This module intercepts syslog() library calls and redirects their output
+ * to the standard output stream. For interactive testing.
+ *
+ * Author: Wietse Venema, Eindhoven University of Technology, The Netherlands.
+ */
+
+#ifndef lint
+static char sccsid[] = "@(#) fakelog.c 1.3 94/12/28 17:42:21";
+#endif
+
+#include <stdio.h>
+
+#include "mystdarg.h"
+
+/* openlog - dummy */
+
+/* ARGSUSED */
+
+openlog(name, logopt, facility)
+char *name;
+int logopt;
+int facility;
+{
+ /* void */
+}
+
+/* vsyslog - format one record */
+
+vsyslog(severity, fmt, ap)
+int severity;
+char *fmt;
+va_list ap;
+{
+ char buf[BUFSIZ];
+
+ vprintf(percent_m(buf, fmt), ap);
+ printf("\n");
+ fflush(stdout);
+}
+
+/* syslog - format one record */
+
+/* VARARGS */
+
+VARARGS(syslog, int, severity)
+{
+ va_list ap;
+ char *fmt;
+
+ VASTART(ap, int, severity);
+ fmt = va_arg(ap, char *);
+ vsyslog(severity, fmt, ap);
+ VAEND(ap);
+}
+
+/* closelog - dummy */
+
+closelog()
+{
+ /* void */
+}
diff --git a/contrib/tcp_wrappers/fix_options.c b/contrib/tcp_wrappers/fix_options.c
new file mode 100644
index 000000000000..b5e81b89bccb
--- /dev/null
+++ b/contrib/tcp_wrappers/fix_options.c
@@ -0,0 +1,109 @@
+ /*
+ * Routine to disable IP-level socket options. This code was taken from 4.4BSD
+ * rlogind and kernel source, but all mistakes in it are my fault.
+ *
+ * Author: Wietse Venema, Eindhoven University of Technology, The Netherlands.
+ */
+
+#ifndef lint
+static char sccsid[] = "@(#) fix_options.c 1.6 97/04/08 02:29:19";
+#endif
+
+#include <sys/types.h>
+#include <sys/param.h>
+#include <netinet/in.h>
+#include <netinet/in_systm.h>
+#include <netinet/ip.h>
+#include <netdb.h>
+#include <stdio.h>
+#include <syslog.h>
+
+#ifndef IPOPT_OPTVAL
+#define IPOPT_OPTVAL 0
+#define IPOPT_OLEN 1
+#endif
+
+#include "tcpd.h"
+
+#define BUFFER_SIZE 512 /* Was: BUFSIZ */
+
+/* fix_options - get rid of IP-level socket options */
+
+fix_options(request)
+struct request_info *request;
+{
+#ifdef IP_OPTIONS
+ unsigned char optbuf[BUFFER_SIZE / 3], *cp;
+ char lbuf[BUFFER_SIZE], *lp;
+ int optsize = sizeof(optbuf), ipproto;
+ struct protoent *ip;
+ int fd = request->fd;
+ unsigned int opt;
+ int optlen;
+ struct in_addr dummy;
+
+ if ((ip = getprotobyname("ip")) != 0)
+ ipproto = ip->p_proto;
+ else
+ ipproto = IPPROTO_IP;
+
+ if (getsockopt(fd, ipproto, IP_OPTIONS, (char *) optbuf, &optsize) == 0
+ && optsize != 0) {
+
+ /*
+ * Horror! 4.[34] BSD getsockopt() prepends the first-hop destination
+ * address to the result IP options list when source routing options
+ * are present (see <netinet/ip_var.h>), but produces no output for
+ * other IP options. Solaris 2.x getsockopt() does produce output for
+ * non-routing IP options, and uses the same format as BSD even when
+ * the space for the destination address is unused. The code below
+ * does the right thing with 4.[34]BSD derivatives and Solaris 2, but
+ * may occasionally miss source routing options on incompatible
+ * systems such as Linux. Their choice.
+ *
+ * Look for source routing options. Drop the connection when one is
+ * found. Just wiping the IP options is insufficient: we would still
+ * help the attacker by providing a real TCP sequence number, and the
+ * attacker would still be able to send packets (blind spoofing). I
+ * discussed this attack with Niels Provos, half a year before the
+ * attack was described in open mailing lists.
+ *
+ * It would be cleaner to just return a yes/no reply and let the caller
+ * decide how to deal with it. Resident servers should not terminate.
+ * However I am not prepared to make changes to internal interfaces
+ * on short notice.
+ */
+#define ADDR_LEN sizeof(dummy.s_addr)
+
+ for (cp = optbuf + ADDR_LEN; cp < optbuf + optsize; cp += optlen) {
+ opt = cp[IPOPT_OPTVAL];
+ if (opt == IPOPT_LSRR || opt == IPOPT_SSRR) {
+ syslog(LOG_WARNING,
+ "refused connect from %s with IP source routing options",
+ eval_client(request));
+ shutdown(fd, 2);
+ return;
+ }
+ if (opt == IPOPT_EOL)
+ break;
+ if (opt == IPOPT_NOP) {
+ optlen = 1;
+ } else {
+ optlen = cp[IPOPT_OLEN];
+ if (optlen <= 0) /* Do not loop! */
+ break;
+ }
+ }
+ lp = lbuf;
+ for (cp = optbuf; optsize > 0; cp++, optsize--, lp += 3)
+ sprintf(lp, " %2.2x", *cp);
+ syslog(LOG_NOTICE,
+ "connect from %s with IP options (ignored):%s",
+ eval_client(request), lbuf);
+ if (setsockopt(fd, ipproto, IP_OPTIONS, (char *) 0, optsize) != 0) {
+ syslog(LOG_ERR, "setsockopt IP_OPTIONS NULL: %m");
+ shutdown(fd, 2);
+ }
+ }
+#endif
+}
diff --git a/contrib/tcp_wrappers/fromhost.c b/contrib/tcp_wrappers/fromhost.c
new file mode 100644
index 000000000000..a46c506e7915
--- /dev/null
+++ b/contrib/tcp_wrappers/fromhost.c
@@ -0,0 +1,52 @@
+ /*
+ * On socket-only systems, fromhost() is nothing but an alias for the
+ * socket-specific sock_host() function.
+ *
+ * On systems with sockets and TLI, fromhost() determines the type of API
+ * (sockets, TLI), then invokes the appropriate API-specific routines.
+ *
+ * Diagnostics are reported through syslog(3).
+ *
+ * Author: Wietse Venema, Eindhoven University of Technology, The Netherlands.
+ */
+
+#ifndef lint
+static char sccsid[] = "@(#) fromhost.c 1.17 94/12/28 17:42:23";
+#endif
+
+#if defined(TLI) || defined(PTX) || defined(TLI_SEQUENT)
+
+/* System libraries. */
+
+#include <sys/types.h>
+#include <sys/tiuser.h>
+#include <stropts.h>
+
+/* Local stuff. */
+
+#include "tcpd.h"
+
+/* fromhost - find out what network API we should use */
+
+void fromhost(request)
+struct request_info *request;
+{
+
+ /*
+ * On systems with streams support the IP network protocol family may be
+ * accessible via more than one programming interface: Berkeley sockets
+ * and the Transport Level Interface (TLI).
+ *
+ * Thus, we must first find out what programming interface to use: sockets
+ * or TLI. On some systems, sockets are not part of the streams system,
+ * so if request->fd is not a stream we simply assume sockets.
+ */
+
+ if (ioctl(request->fd, I_FIND, "timod") > 0) {
+ tli_host(request);
+ } else {
+ sock_host(request);
+ }
+}
+
+#endif /* TLI || PTX || TLI_SEQUENT */
diff --git a/contrib/tcp_wrappers/hosts_access.3 b/contrib/tcp_wrappers/hosts_access.3
new file mode 100644
index 000000000000..1485337ff66e
--- /dev/null
+++ b/contrib/tcp_wrappers/hosts_access.3
@@ -0,0 +1,93 @@
+.TH HOSTS_ACCESS 3
+.SH NAME
+hosts_access, hosts_ctl, request_init, request_set \- access control library
+.SH SYNOPSIS
+.nf
+#include "tcpd.h"
+
+extern int allow_severity;
+extern int deny_severity;
+
+struct request_info *request_init(request, key, value, ..., 0)
+struct request_info *request;
+
+struct request_info *request_set(request, key, value, ..., 0)
+struct request_info *request;
+
+int hosts_access(request)
+struct request_info *request;
+
+int hosts_ctl(daemon, client_name, client_addr, client_user)
+char *daemon;
+char *client_name;
+char *client_addr;
+char *client_user;
+.fi
+.SH DESCRIPTION
+The routines described in this document are part of the \fIlibwrap.a\fR
+library. They implement a rule-based access control language with
+optional shell commands that are executed when a rule fires.
+.PP
+request_init() initializes a structure with information about a client
+request. request_set() updates an already initialized request
+structure. Both functions take a variable-length list of key-value
+pairs and return their first argument. The argument lists are
+terminated with a zero key value. All string-valued arguments are
+copied. The expected keys (and corresponding value types) are:
+.IP "RQ_FILE (int)"
+The file descriptor associated with the request.
+.IP "RQ_CLIENT_NAME (char *)"
+The client host name.
+.IP "RQ_CLIENT_ADDR (char *)"
+A printable representation of the client network address.
+.IP "RQ_CLIENT_SIN (struct sockaddr_in *)"
+An internal representation of the client network address and port. The
+contents of the structure are not copied.
+.IP "RQ_SERVER_NAME (char *)"
+The hostname associated with the server endpoint address.
+.IP "RQ_SERVER_ADDR (char *)"
+A printable representation of the server endpoint address.
+.IP "RQ_SERVER_SIN (struct sockaddr_in *)"
+An internal representation of the server endpoint address and port.
+The contents of the structure are not copied.
+.IP "RQ_DAEMON (char *)"
+The name of the daemon process running on the server host.
+.IP "RQ_USER (char *)"
+The name of the user on whose behalf the client host makes the request.
+.PP
+hosts_access() consults the access control tables described in the
+\fIhosts_access(5)\fR manual page. When internal endpoint information
+is available, host names and client user names are looked up on demand,
+using the request structure as a cache. hosts_access() returns zero if
+access should be denied.
+.PP
+hosts_ctl() is a wrapper around the request_init() and hosts_access()
+routines with a perhaps more convenient interface (though it does not
+pass on enough information to support automated client username
+lookups). The client host address, client host name and username
+arguments should contain valid data or STRING_UNKNOWN. hosts_ctl()
+returns zero if access should be denied.
+.PP
+The \fIallow_severity\fR and \fIdeny_severity\fR variables determine
+how accepted and rejected requests may be logged. They must be provided
+by the caller and may be modified by rules in the access control
+tables.
+.SH DIAGNOSTICS
+Problems are reported via the syslog daemon.
+.SH SEE ALSO
+hosts_access(5), format of the access control tables.
+hosts_options(5), optional extensions to the base language.
+.SH FILES
+/etc/hosts.allow, /etc/hosts.deny, access control tables.
+.SH BUGS
+hosts_access() uses the strtok() library function. This may interfere
+with other code that relies on strtok().
+.SH AUTHOR
+.na
+.nf
+Wietse Venema (wietse@wzv.win.tue.nl)
+Department of Mathematics and Computing Science
+Eindhoven University of Technology
+Den Dolech 2, P.O. Box 513,
+5600 MB Eindhoven, The Netherlands
+\" @(#) hosts_access.3 1.8 96/02/11 17:01:26
diff --git a/contrib/tcp_wrappers/hosts_access.5 b/contrib/tcp_wrappers/hosts_access.5
new file mode 100644
index 000000000000..5fe1f2969b8c
--- /dev/null
+++ b/contrib/tcp_wrappers/hosts_access.5
@@ -0,0 +1,378 @@
+.TH HOSTS_ACCESS 5
+.SH NAME
+hosts_access \- format of host access control files
+.SH DESCRIPTION
+This manual page describes a simple access control language that is
+based on client (host name/address, user name), and server (process
+name, host name/address) patterns. Examples are given at the end. The
+impatient reader is encouraged to skip to the EXAMPLES section for a
+quick introduction.
+.PP
+An extended version of the access control language is described in the
+\fIhosts_options\fR(5) document. The extensions are turned on at
+program build time by building with -DPROCESS_OPTIONS.
+.PP
+In the following text, \fIdaemon\fR is the the process name of a
+network daemon process, and \fIclient\fR is the name and/or address of
+a host requesting service. Network daemon process names are specified
+in the inetd configuration file.
+.SH ACCESS CONTROL FILES
+The access control software consults two files. The search stops
+at the first match:
+.IP \(bu
+Access will be granted when a (daemon,client) pair matches an entry in
+the \fI/etc/hosts.allow\fR file.
+.IP \(bu
+Otherwise, access will be denied when a (daemon,client) pair matches an
+entry in the \fI/etc/hosts.deny\fR file.
+.IP \(bu
+Otherwise, access will be granted.
+.PP
+A non-existing access control file is treated as if it were an empty
+file. Thus, access control can be turned off by providing no access
+control files.
+.SH ACCESS CONTROL RULES
+Each access control file consists of zero or more lines of text. These
+lines are processed in order of appearance. The search terminates when a
+match is found.
+.IP \(bu
+A newline character is ignored when it is preceded by a backslash
+character. This permits you to break up long lines so that they are
+easier to edit.
+.IP \(bu
+Blank lines or lines that begin with a `#\' character are ignored.
+This permits you to insert comments and whitespace so that the tables
+are easier to read.
+.IP \(bu
+All other lines should satisfy the following format, things between []
+being optional:
+.sp
+.ti +3
+daemon_list : client_list [ : shell_command ]
+.PP
+\fIdaemon_list\fR is a list of one or more daemon process names
+(argv[0] values) or wildcards (see below).
+.PP
+\fIclient_list\fR is a list
+of one or more host names, host addresses, patterns or wildcards (see
+below) that will be matched against the client host name or address.
+.PP
+The more complex forms \fIdaemon@host\fR and \fIuser@host\fR are
+explained in the sections on server endpoint patterns and on client
+username lookups, respectively.
+.PP
+List elements should be separated by blanks and/or commas.
+.PP
+With the exception of NIS (YP) netgroup lookups, all access control
+checks are case insensitive.
+.ne 4
+.SH PATTERNS
+The access control language implements the following patterns:
+.IP \(bu
+A string that begins with a `.\' character. A host name is matched if
+the last components of its name match the specified pattern. For
+example, the pattern `.tue.nl\' matches the host name
+`wzv.win.tue.nl\'.
+.IP \(bu
+A string that ends with a `.\' character. A host address is matched if
+its first numeric fields match the given string. For example, the
+pattern `131.155.\' matches the address of (almost) every host on the
+Eind\%hoven University network (131.155.x.x).
+.IP \(bu
+A string that begins with an `@\' character is treated as an NIS
+(formerly YP) netgroup name. A host name is matched if it is a host
+member of the specified netgroup. Netgroup matches are not supported
+for daemon process names or for client user names.
+.IP \(bu
+An expression of the form `n.n.n.n/m.m.m.m\' is interpreted as a
+`net/mask\' pair. A host address is matched if `net\' is equal to the
+bitwise AND of the address and the `mask\'. For example, the net/mask
+pattern `131.155.72.0/255.255.254.0\' matches every address in the
+range `131.155.72.0\' through `131.155.73.255\'.
+.SH WILDCARDS
+The access control language supports explicit wildcards:
+.IP ALL
+The universal wildcard, always matches.
+.IP LOCAL
+Matches any host whose name does not contain a dot character.
+.IP UNKNOWN
+Matches any user whose name is unknown, and matches any host whose name
+\fIor\fR address are unknown. This pattern should be used with care:
+host names may be unavailable due to temporary name server problems. A
+network address will be unavailable when the software cannot figure out
+what type of network it is talking to.
+.IP KNOWN
+Matches any user whose name is known, and matches any host whose name
+\fIand\fR address are known. This pattern should be used with care:
+host names may be unavailable due to temporary name server problems. A
+network address will be unavailable when the software cannot figure out
+what type of network it is talking to.
+.IP PARANOID
+Matches any host whose name does not match its address. When tcpd is
+built with -DPARANOID (default mode), it drops requests from such
+clients even before looking at the access control tables. Build
+without -DPARANOID when you want more control over such requests.
+.ne 6
+.SH OPERATORS
+.IP EXCEPT
+Intended use is of the form: `list_1 EXCEPT list_2\'; this construct
+matches anything that matches \fIlist_1\fR unless it matches
+\fIlist_2\fR. The EXCEPT operator can be used in daemon_lists and in
+client_lists. The EXCEPT operator can be nested: if the control
+language would permit the use of parentheses, `a EXCEPT b EXCEPT c\'
+would parse as `(a EXCEPT (b EXCEPT c))\'.
+.br
+.ne 6
+.SH SHELL COMMANDS
+If the first-matched access control rule contains a shell command, that
+command is subjected to %<letter> substitutions (see next section).
+The result is executed by a \fI/bin/sh\fR child process with standard
+input, output and error connected to \fI/dev/null\fR. Specify an `&\'
+at the end of the command if you do not want to wait until it has
+completed.
+.PP
+Shell commands should not rely on the PATH setting of the inetd.
+Instead, they should use absolute path names, or they should begin with
+an explicit PATH=whatever statement.
+.PP
+The \fIhosts_options\fR(5) document describes an alternative language
+that uses the shell command field in a different and incompatible way.
+.SH % EXPANSIONS
+The following expansions are available within shell commands:
+.IP "%a (%A)"
+The client (server) host address.
+.IP %c
+Client information: user@host, user@address, a host name, or just an
+address, depending on how much information is available.
+.IP %d
+The daemon process name (argv[0] value).
+.IP "%h (%H)"
+The client (server) host name or address, if the host name is
+unavailable.
+.IP "%n (%N)"
+The client (server) host name (or "unknown" or "paranoid").
+.IP %p
+The daemon process id.
+.IP %s
+Server information: daemon@host, daemon@address, or just a daemon name,
+depending on how much information is available.
+.IP %u
+The client user name (or "unknown").
+.IP %%
+Expands to a single `%\' character.
+.PP
+Characters in % expansions that may confuse the shell are replaced by
+underscores.
+.SH SERVER ENDPOINT PATTERNS
+In order to distinguish clients by the network address that they
+connect to, use patterns of the form:
+.sp
+.ti +3
+process_name@host_pattern : client_list ...
+.sp
+Patterns like these can be used when the machine has different internet
+addresses with different internet hostnames. Service providers can use
+this facility to offer FTP, GOPHER or WWW archives with internet names
+that may even belong to different organizations. See also the `twist'
+option in the hosts_options(5) document. Some systems (Solaris,
+FreeBSD) can have more than one internet address on one physical
+interface; with other systems you may have to resort to SLIP or PPP
+pseudo interfaces that live in a dedicated network address space.
+.sp
+The host_pattern obeys the same syntax rules as host names and
+addresses in client_list context. Usually, server endpoint information
+is available only with connection-oriented services.
+.SH CLIENT USERNAME LOOKUP
+When the client host supports the RFC 931 protocol or one of its
+descendants (TAP, IDENT, RFC 1413) the wrapper programs can retrieve
+additional information about the owner of a connection. Client username
+information, when available, is logged together with the client host
+name, and can be used to match patterns like:
+.PP
+.ti +3
+daemon_list : ... user_pattern@host_pattern ...
+.PP
+The daemon wrappers can be configured at compile time to perform
+rule-driven username lookups (default) or to always interrogate the
+client host. In the case of rule-driven username lookups, the above
+rule would cause username lookup only when both the \fIdaemon_list\fR
+and the \fIhost_pattern\fR match.
+.PP
+A user pattern has the same syntax as a daemon process pattern, so the
+same wildcards apply (netgroup membership is not supported). One
+should not get carried away with username lookups, though.
+.IP \(bu
+The client username information cannot be trusted when it is needed
+most, i.e. when the client system has been compromised. In general,
+ALL and (UN)KNOWN are the only user name patterns that make sense.
+.IP \(bu
+Username lookups are possible only with TCP-based services, and only
+when the client host runs a suitable daemon; in all other cases the
+result is "unknown".
+.IP \(bu
+A well-known UNIX kernel bug may cause loss of service when username
+lookups are blocked by a firewall. The wrapper README document
+describes a procedure to find out if your kernel has this bug.
+.IP \(bu
+Username lookups may cause noticeable delays for non-UNIX users. The
+default timeout for username lookups is 10 seconds: too short to cope
+with slow networks, but long enough to irritate PC users.
+.PP
+Selective username lookups can alleviate the last problem. For example,
+a rule like:
+.PP
+.ti +3
+daemon_list : @pcnetgroup ALL@ALL
+.PP
+would match members of the pc netgroup without doing username lookups,
+but would perform username lookups with all other systems.
+.SH DETECTING ADDRESS SPOOFING ATTACKS
+A flaw in the sequence number generator of many TCP/IP implementations
+allows intruders to easily impersonate trusted hosts and to break in
+via, for example, the remote shell service. The IDENT (RFC931 etc.)
+service can be used to detect such and other host address spoofing
+attacks.
+.PP
+Before accepting a client request, the wrappers can use the IDENT
+service to find out that the client did not send the request at all.
+When the client host provides IDENT service, a negative IDENT lookup
+result (the client matches `UNKNOWN@host') is strong evidence of a host
+spoofing attack.
+.PP
+A positive IDENT lookup result (the client matches `KNOWN@host') is
+less trustworthy. It is possible for an intruder to spoof both the
+client connection and the IDENT lookup, although doing so is much
+harder than spoofing just a client connection. It may also be that
+the client\'s IDENT server is lying.
+.PP
+Note: IDENT lookups don\'t work with UDP services.
+.SH EXAMPLES
+The language is flexible enough that different types of access control
+policy can be expressed with a minimum of fuss. Although the language
+uses two access control tables, the most common policies can be
+implemented with one of the tables being trivial or even empty.
+.PP
+When reading the examples below it is important to realize that the
+allow table is scanned before the deny table, that the search
+terminates when a match is found, and that access is granted when no
+match is found at all.
+.PP
+The examples use host and domain names. They can be improved by
+including address and/or network/netmask information, to reduce the
+impact of temporary name server lookup failures.
+.SH MOSTLY CLOSED
+In this case, access is denied by default. Only explicitly authorized
+hosts are permitted access.
+.PP
+The default policy (no access) is implemented with a trivial deny
+file:
+.PP
+.ne 2
+/etc/hosts.deny:
+.in +3
+ALL: ALL
+.PP
+This denies all service to all hosts, unless they are permitted access
+by entries in the allow file.
+.PP
+The explicitly authorized hosts are listed in the allow file.
+For example:
+.PP
+.ne 2
+/etc/hosts.allow:
+.in +3
+ALL: LOCAL @some_netgroup
+.br
+ALL: .foobar.edu EXCEPT terminalserver.foobar.edu
+.PP
+The first rule permits access from hosts in the local domain (no `.\'
+in the host name) and from members of the \fIsome_netgroup\fP
+netgroup. The second rule permits access from all hosts in the
+\fIfoobar.edu\fP domain (notice the leading dot), with the exception of
+\fIterminalserver.foobar.edu\fP.
+.SH MOSTLY OPEN
+Here, access is granted by default; only explicitly specified hosts are
+refused service.
+.PP
+The default policy (access granted) makes the allow file redundant so
+that it can be omitted. The explicitly non-authorized hosts are listed
+in the deny file. For example:
+.PP
+/etc/hosts.deny:
+.in +3
+ALL: some.host.name, .some.domain
+.br
+ALL EXCEPT in.fingerd: other.host.name, .other.domain
+.PP
+The first rule denies some hosts and domains all services; the second
+rule still permits finger requests from other hosts and domains.
+.SH BOOBY TRAPS
+The next example permits tftp requests from hosts in the local domain
+(notice the leading dot). Requests from any other hosts are denied.
+Instead of the requested file, a finger probe is sent to the offending
+host. The result is mailed to the superuser.
+.PP
+.ne 2
+/etc/hosts.allow:
+.in +3
+.nf
+in.tftpd: LOCAL, .my.domain
+.PP
+.ne 2
+/etc/hosts.deny:
+.in +3
+.nf
+in.tftpd: ALL: (/some/where/safe_finger -l @%h | \\
+ /usr/ucb/mail -s %d-%h root) &
+.fi
+.PP
+The safe_finger command comes with the tcpd wrapper and should be
+installed in a suitable place. It limits possible damage from data sent
+by the remote finger server. It gives better protection than the
+standard finger command.
+.PP
+The expansion of the %h (client host) and %d (service name) sequences
+is described in the section on shell commands.
+.PP
+Warning: do not booby-trap your finger daemon, unless you are prepared
+for infinite finger loops.
+.PP
+On network firewall systems this trick can be carried even further.
+The typical network firewall only provides a limited set of services to
+the outer world. All other services can be "bugged" just like the above
+tftp example. The result is an excellent early-warning system.
+.br
+.ne 4
+.SH DIAGNOSTICS
+An error is reported when a syntax error is found in a host access
+control rule; when the length of an access control rule exceeds the
+capacity of an internal buffer; when an access control rule is not
+terminated by a newline character; when the result of %<letter>
+expansion would overflow an internal buffer; when a system call fails
+that shouldn\'t. All problems are reported via the syslog daemon.
+.SH FILES
+.na
+.nf
+/etc/hosts.allow, (daemon,client) pairs that are granted access.
+/etc/hosts.deny, (daemon,client) pairs that are denied access.
+.ad
+.fi
+.SH SEE ALSO
+.nf
+tcpd(8) tcp/ip daemon wrapper program.
+tcpdchk(8), tcpdmatch(8), test programs.
+.SH BUGS
+If a name server lookup times out, the host name will not be available
+to the access control software, even though the host is registered.
+.PP
+Domain name server lookups are case insensitive; NIS (formerly YP)
+netgroup lookups are case sensitive.
+.SH AUTHOR
+.na
+.nf
+Wietse Venema (wietse@wzv.win.tue.nl)
+Department of Mathematics and Computing Science
+Eindhoven University of Technology
+Den Dolech 2, P.O. Box 513,
+5600 MB Eindhoven, The Netherlands
+\" @(#) hosts_access.5 1.20 95/01/30 19:51:46
diff --git a/contrib/tcp_wrappers/hosts_access.c b/contrib/tcp_wrappers/hosts_access.c
new file mode 100644
index 000000000000..9bdc7bcd66e9
--- /dev/null
+++ b/contrib/tcp_wrappers/hosts_access.c
@@ -0,0 +1,331 @@
+ /*
+ * This module implements a simple access control language that is based on
+ * host (or domain) names, NIS (host) netgroup names, IP addresses (or
+ * network numbers) and daemon process names. When a match is found the
+ * search is terminated, and depending on whether PROCESS_OPTIONS is defined,
+ * a list of options is executed or an optional shell command is executed.
+ *
+ * Host and user names are looked up on demand, provided that suitable endpoint
+ * information is available as sockaddr_in structures or TLI netbufs. As a
+ * side effect, the pattern matching process may change the contents of
+ * request structure fields.
+ *
+ * Diagnostics are reported through syslog(3).
+ *
+ * Compile with -DNETGROUP if your library provides support for netgroups.
+ *
+ * Author: Wietse Venema, Eindhoven University of Technology, The Netherlands.
+ */
+
+#ifndef lint
+static char sccsid[] = "@(#) hosts_access.c 1.21 97/02/12 02:13:22";
+#endif
+
+/* System libraries. */
+
+#include <sys/types.h>
+#include <sys/param.h>
+#include <netinet/in.h>
+#include <arpa/inet.h>
+#include <stdio.h>
+#include <syslog.h>
+#include <ctype.h>
+#include <errno.h>
+#include <setjmp.h>
+#include <string.h>
+
+extern char *fgets();
+extern int errno;
+
+#ifndef INADDR_NONE
+#define INADDR_NONE (-1) /* XXX should be 0xffffffff */
+#endif
+
+/* Local stuff. */
+
+#include "tcpd.h"
+
+/* Error handling. */
+
+extern jmp_buf tcpd_buf;
+
+/* Delimiters for lists of daemons or clients. */
+
+static char sep[] = ", \t\r\n";
+
+/* Constants to be used in assignments only, not in comparisons... */
+
+#define YES 1
+#define NO 0
+
+ /*
+ * These variables are globally visible so that they can be redirected in
+ * verification mode.
+ */
+
+char *hosts_allow_table = HOSTS_ALLOW;
+char *hosts_deny_table = HOSTS_DENY;
+int hosts_access_verbose = 0;
+
+ /*
+ * In a long-running process, we are not at liberty to just go away.
+ */
+
+int resident = (-1); /* -1, 0: unknown; +1: yes */
+
+/* Forward declarations. */
+
+static int table_match();
+static int list_match();
+static int server_match();
+static int client_match();
+static int host_match();
+static int string_match();
+static int masked_match();
+
+/* Size of logical line buffer. */
+
+#define BUFLEN 2048
+
+/* hosts_access - host access control facility */
+
+int hosts_access(request)
+struct request_info *request;
+{
+ int verdict;
+
+ /*
+ * If the (daemon, client) pair is matched by an entry in the file
+ * /etc/hosts.allow, access is granted. Otherwise, if the (daemon,
+ * client) pair is matched by an entry in the file /etc/hosts.deny,
+ * access is denied. Otherwise, access is granted. A non-existent
+ * access-control file is treated as an empty file.
+ *
+ * After a rule has been matched, the optional language extensions may
+ * decide to grant or refuse service anyway. Or, while a rule is being
+ * processed, a serious error is found, and it seems better to play safe
+ * and deny service. All this is done by jumping back into the
+ * hosts_access() routine, bypassing the regular return from the
+ * table_match() function calls below.
+ */
+
+ if (resident <= 0)
+ resident++;
+ verdict = setjmp(tcpd_buf);
+ if (verdict != 0)
+ return (verdict == AC_PERMIT);
+ if (table_match(hosts_allow_table, request))
+ return (YES);
+ if (table_match(hosts_deny_table, request))
+ return (NO);
+ return (YES);
+}
+
+/* table_match - match table entries with (daemon, client) pair */
+
+static int table_match(table, request)
+char *table;
+struct request_info *request;
+{
+ FILE *fp;
+ char sv_list[BUFLEN]; /* becomes list of daemons */
+ char *cl_list; /* becomes list of clients */
+ char *sh_cmd; /* becomes optional shell command */
+ int match = NO;
+ struct tcpd_context saved_context;
+
+ saved_context = tcpd_context; /* stupid compilers */
+
+ /*
+ * Between the fopen() and fclose() calls, avoid jumps that may cause
+ * file descriptor leaks.
+ */
+
+ if ((fp = fopen(table, "r")) != 0) {
+ tcpd_context.file = table;
+ tcpd_context.line = 0;
+ while (match == NO && xgets(sv_list, sizeof(sv_list), fp) != 0) {
+ if (sv_list[strlen(sv_list) - 1] != '\n') {
+ tcpd_warn("missing newline or line too long");
+ continue;
+ }
+ if (sv_list[0] == '#' || sv_list[strspn(sv_list, " \t\r\n")] == 0)
+ continue;
+ if ((cl_list = split_at(sv_list, ':')) == 0) {
+ tcpd_warn("missing \":\" separator");
+ continue;
+ }
+ sh_cmd = split_at(cl_list, ':');
+ match = list_match(sv_list, request, server_match)
+ && list_match(cl_list, request, client_match);
+ }
+ (void) fclose(fp);
+ } else if (errno != ENOENT) {
+ tcpd_warn("cannot open %s: %m", table);
+ }
+ if (match) {
+ if (hosts_access_verbose > 1)
+ syslog(LOG_DEBUG, "matched: %s line %d",
+ tcpd_context.file, tcpd_context.line);
+ if (sh_cmd) {
+#ifdef PROCESS_OPTIONS
+ process_options(sh_cmd, request);
+#else
+ char cmd[BUFSIZ];
+ shell_cmd(percent_x(cmd, sizeof(cmd), sh_cmd, request));
+#endif
+ }
+ }
+ tcpd_context = saved_context;
+ return (match);
+}
+
+/* list_match - match a request against a list of patterns with exceptions */
+
+static int list_match(list, request, match_fn)
+char *list;
+struct request_info *request;
+int (*match_fn) ();
+{
+ char *tok;
+
+ /*
+ * Process tokens one at a time. We have exhausted all possible matches
+ * when we reach an "EXCEPT" token or the end of the list. If we do find
+ * a match, look for an "EXCEPT" list and recurse to determine whether
+ * the match is affected by any exceptions.
+ */
+
+ for (tok = strtok(list, sep); tok != 0; tok = strtok((char *) 0, sep)) {
+ if (STR_EQ(tok, "EXCEPT")) /* EXCEPT: give up */
+ return (NO);
+ if (match_fn(tok, request)) { /* YES: look for exceptions */
+ while ((tok = strtok((char *) 0, sep)) && STR_NE(tok, "EXCEPT"))
+ /* VOID */ ;
+ return (tok == 0 || list_match((char *) 0, request, match_fn) == 0);
+ }
+ }
+ return (NO);
+}
+
+/* server_match - match server information */
+
+static int server_match(tok, request)
+char *tok;
+struct request_info *request;
+{
+ char *host;
+
+ if ((host = split_at(tok + 1, '@')) == 0) { /* plain daemon */
+ return (string_match(tok, eval_daemon(request)));
+ } else { /* daemon@host */
+ return (string_match(tok, eval_daemon(request))
+ && host_match(host, request->server));
+ }
+}
+
+/* client_match - match client information */
+
+static int client_match(tok, request)
+char *tok;
+struct request_info *request;
+{
+ char *host;
+
+ if ((host = split_at(tok + 1, '@')) == 0) { /* plain host */
+ return (host_match(tok, request->client));
+ } else { /* user@host */
+ return (host_match(host, request->client)
+ && string_match(tok, eval_user(request)));
+ }
+}
+
+/* host_match - match host name and/or address against pattern */
+
+static int host_match(tok, host)
+char *tok;
+struct host_info *host;
+{
+ char *mask;
+
+ /*
+ * This code looks a little hairy because we want to avoid unnecessary
+ * hostname lookups.
+ *
+ * The KNOWN pattern requires that both address AND name be known; some
+ * patterns are specific to host names or to host addresses; all other
+ * patterns are satisfied when either the address OR the name match.
+ */
+
+ if (tok[0] == '@') { /* netgroup: look it up */
+#ifdef NETGROUP
+ static char *mydomain = 0;
+ if (mydomain == 0)
+ yp_get_default_domain(&mydomain);
+ return (innetgr(tok + 1, eval_hostname(host), (char *) 0, mydomain));
+#else
+ tcpd_warn("netgroup support is disabled"); /* not tcpd_jump() */
+ return (NO);
+#endif
+ } else if (STR_EQ(tok, "KNOWN")) { /* check address and name */
+ char *name = eval_hostname(host);
+ return (STR_NE(eval_hostaddr(host), unknown) && HOSTNAME_KNOWN(name));
+ } else if (STR_EQ(tok, "LOCAL")) { /* local: no dots in name */
+ char *name = eval_hostname(host);
+ return (strchr(name, '.') == 0 && HOSTNAME_KNOWN(name));
+ } else if ((mask = split_at(tok, '/')) != 0) { /* net/mask */
+ return (masked_match(tok, mask, eval_hostaddr(host)));
+ } else { /* anything else */
+ return (string_match(tok, eval_hostaddr(host))
+ || (NOT_INADDR(tok) && string_match(tok, eval_hostname(host))));
+ }
+}
+
+/* string_match - match string against pattern */
+
+static int string_match(tok, string)
+char *tok;
+char *string;
+{
+ int n;
+
+ if (tok[0] == '.') { /* suffix */
+ n = strlen(string) - strlen(tok);
+ return (n > 0 && STR_EQ(tok, string + n));
+ } else if (STR_EQ(tok, "ALL")) { /* all: match any */
+ return (YES);
+ } else if (STR_EQ(tok, "KNOWN")) { /* not unknown */
+ return (STR_NE(string, unknown));
+ } else if (tok[(n = strlen(tok)) - 1] == '.') { /* prefix */
+ return (STRN_EQ(tok, string, n));
+ } else { /* exact match */
+ return (STR_EQ(tok, string));
+ }
+}
+
+/* masked_match - match address against netnumber/netmask */
+
+static int masked_match(net_tok, mask_tok, string)
+char *net_tok;
+char *mask_tok;
+char *string;
+{
+ unsigned long net;
+ unsigned long mask;
+ unsigned long addr;
+
+ /*
+ * Disallow forms other than dotted quad: the treatment that inet_addr()
+ * gives to forms with less than four components is inconsistent with the
+ * access control language. John P. Rouillard <rouilj@cs.umb.edu>.
+ */
+
+ if ((addr = dot_quad_addr(string)) == INADDR_NONE)
+ return (NO);
+ if ((net = dot_quad_addr(net_tok)) == INADDR_NONE
+ || (mask = dot_quad_addr(mask_tok)) == INADDR_NONE) {
+ tcpd_warn("bad net/mask expression: %s/%s", net_tok, mask_tok);
+ return (NO); /* not tcpd_jump() */
+ }
+ return ((addr & mask) == net);
+}
diff --git a/contrib/tcp_wrappers/hosts_ctl.c b/contrib/tcp_wrappers/hosts_ctl.c
new file mode 100644
index 000000000000..e57f30aaa4a4
--- /dev/null
+++ b/contrib/tcp_wrappers/hosts_ctl.c
@@ -0,0 +1,38 @@
+ /*
+ * hosts_ctl() combines common applications of the host access control
+ * library routines. It bundles its arguments then calls the hosts_access()
+ * access control checker. The host name and user name arguments should be
+ * empty strings, STRING_UNKNOWN or real data. If a match is found, the
+ * optional shell command is executed.
+ *
+ * Restriction: this interface does not pass enough information to support
+ * selective remote username lookups or selective hostname double checks.
+ *
+ * Author: Wietse Venema, Eindhoven University of Technology, The Netherlands.
+ */
+
+#ifndef lint
+static char sccsid[] = "@(#) hosts_ctl.c 1.4 94/12/28 17:42:27";
+#endif
+
+#include <stdio.h>
+
+#include "tcpd.h"
+
+/* hosts_ctl - limited interface to the hosts_access() routine */
+
+int hosts_ctl(daemon, name, addr, user)
+char *daemon;
+char *name;
+char *addr;
+char *user;
+{
+ struct request_info request;
+
+ return (hosts_access(request_init(&request,
+ RQ_DAEMON, daemon,
+ RQ_CLIENT_NAME, name,
+ RQ_CLIENT_ADDR, addr,
+ RQ_USER, user,
+ 0)));
+}
diff --git a/contrib/tcp_wrappers/hosts_options.5 b/contrib/tcp_wrappers/hosts_options.5
new file mode 100644
index 000000000000..3bd189ee0541
--- /dev/null
+++ b/contrib/tcp_wrappers/hosts_options.5
@@ -0,0 +1,172 @@
+.TH HOSTS_OPTIONS 5
+.SH NAME
+hosts_options \- host access control language extensions
+.SH DESCRIPTION
+This document describes optional extensions to the language described
+in the hosts_access(5) document. The extensions are enabled at program
+build time. For example, by editing the Makefile and turning on the
+PROCESS_OPTIONS compile-time option.
+.PP
+The extensible language uses the following format:
+.sp
+.ti +3
+daemon_list : client_list : option : option ...
+.PP
+The first two fields are described in the hosts_access(5) manual page.
+The remainder of the rules is a list of zero or more options. Any ":"
+characters within options should be protected with a backslash.
+.PP
+An option is of the form "keyword" or "keyword value". Options are
+processed in the specified order. Some options are subjected to
+%<letter> substitutions. For the sake of backwards compatibility with
+earlier versions, an "=" is permitted between keyword and value.
+.SH LOGGING
+.IP "severity mail.info"
+.IP "severity notice"
+Change the severity level at which the event will be logged. Facility
+names (such as mail) are optional, and are not supported on systems
+with older syslog implementations. The severity option can be used
+to emphasize or to ignore specific events.
+.SH ACCESS CONTROL
+.IP "allow"
+.IP "deny"
+Grant (deny) service. These options must appear at the end of a rule.
+.PP
+The \fIallow\fR and \fIdeny\fR keywords make it possible to keep all
+access control rules within a single file, for example in the
+\fIhosts.allow\fR file.
+.sp
+To permit access from specific hosts only:
+.sp
+.ne 2
+.ti +3
+ALL: .friendly.domain: ALLOW
+.ti +3
+ALL: ALL: DENY
+.sp
+To permit access from all hosts except a few trouble makers:
+.sp
+.ne 2
+.ti +3
+ALL: .bad.domain: DENY
+.ti +3
+ALL: ALL: ALLOW
+.sp
+Notice the leading dot on the domain name patterns.
+.SH RUNNING OTHER COMMANDS
+.IP "spawn shell_command"
+Execute, in a child process, the specified shell command, after
+performing the %<letter> expansions described in the hosts_access(5)
+manual page. The command is executed with stdin, stdout and stderr
+connected to the null device, so that it won\'t mess up the
+conversation with the client host. Example:
+.sp
+.nf
+.ti +3
+spawn (/some/where/safe_finger -l @%h | /usr/ucb/mail root) &
+.fi
+.sp
+executes, in a background child process, the shell command "safe_finger
+-l @%h | mail root" after replacing %h by the name or address of the
+remote host.
+.sp
+The example uses the "safe_finger" command instead of the regular
+"finger" command, to limit possible damage from data sent by the finger
+server. The "safe_finger" command is part of the daemon wrapper
+package; it is a wrapper around the regular finger command that filters
+the data sent by the remote host.
+.IP "twist shell_command"
+Replace the current process by an instance of the specified shell
+command, after performing the %<letter> expansions described in the
+hosts_access(5) manual page. Stdin, stdout and stderr are connected to
+the client process. This option must appear at the end of a rule.
+.sp
+To send a customized bounce message to the client instead of
+running the real ftp daemon:
+.sp
+.nf
+.ti +3
+in.ftpd : ... : twist /bin/echo 421 Some bounce message
+.fi
+.sp
+For an alternative way to talk to client processes, see the
+\fIbanners\fR option below.
+.sp
+To run /some/other/in.telnetd without polluting its command-line
+array or its process environment:
+.sp
+.nf
+.ti +3
+in.telnetd : ... : twist PATH=/some/other; exec in.telnetd
+.fi
+.sp
+Warning: in case of UDP services, do not twist to commands that use
+the standard I/O or the read(2)/write(2) routines to communicate with
+the client process; UDP requires other I/O primitives.
+.SH NETWORK OPTIONS
+.IP "keepalive"
+Causes the server to periodically send a message to the client. The
+connection is considered broken when the client does not respond. The
+keepalive option can be useful when users turn off their machine while
+it is still connected to a server. The keepalive option is not useful
+for datagram (UDP) services.
+.IP "linger number_of_seconds"
+Specifies how long the kernel will try to deliver not-yet delivered
+data after the server process closes a connection.
+.SH USERNAME LOOKUP
+.IP "rfc931 [ timeout_in_seconds ]"
+Look up the client user name with the RFC 931 (TAP, IDENT, RFC 1413)
+protocol. This option is silently ignored in case of services based on
+transports other than TCP. It requires that the client system runs an
+RFC 931 (IDENT, etc.) -compliant daemon, and may cause noticeable
+delays with connections from non-UNIX clients. The timeout period is
+optional. If no timeout is specified a compile-time defined default
+value is taken.
+.SH MISCELLANEOUS
+.IP "banners /some/directory"
+Look for a file in `/some/directory' with the same name as the daemon
+process (for example in.telnetd for the telnet service), and copy its
+contents to the client. Newline characters are replaced by
+carriage-return newline, and %<letter> sequences are expanded (see
+the hosts_access(5) manual page).
+.sp
+The tcp wrappers source code distribution provides a sample makefile
+(Banners.Makefile) for convenient banner maintenance.
+.sp
+Warning: banners are supported for connection-oriented (TCP) network
+services only.
+.IP "nice [ number ]"
+Change the nice value of the process (default 10). Specify a positive
+value to spend more CPU resources on other processes.
+.IP "setenv name value"
+Place a (name, value) pair into the process environment. The value is
+subjected to %<letter> expansions and may contain whitespace (but
+leading and trailing blanks are stripped off).
+.sp
+Warning: many network daemons reset their environment before spawning a
+login or shell process.
+.IP "umask 022"
+Like the umask command that is built into the shell. An umask of 022
+prevents the creation of files with group and world write permission.
+The umask argument should be an octal number.
+.IP "user nobody"
+.IP "user nobody.kmem"
+Assume the privileges of the "nobody" userid (or user "nobody", group
+"kmem"). The first form is useful with inetd implementations that run
+all services with root privilege. The second form is useful for
+services that need special group privileges only.
+.SH DIAGNOSTICS
+When a syntax error is found in an access control rule, the error
+is reported to the syslog daemon; further options will be ignored,
+and service is denied.
+.SH SEE ALSO
+hosts_access(5), the default access control language
+.SH AUTHOR
+.na
+.nf
+Wietse Venema (wietse@wzv.win.tue.nl)
+Department of Mathematics and Computing Science
+Eindhoven University of Technology
+Den Dolech 2, P.O. Box 513,
+5600 MB Eindhoven, The Netherlands
+\" @(#) hosts_options.5 1.10 94/12/28 17:42:28
diff --git a/contrib/tcp_wrappers/inetcf.c b/contrib/tcp_wrappers/inetcf.c
new file mode 100644
index 000000000000..13838db9a4cc
--- /dev/null
+++ b/contrib/tcp_wrappers/inetcf.c
@@ -0,0 +1,317 @@
+ /*
+ * Routines to parse an inetd.conf or tlid.conf file. This would be a great
+ * job for a PERL script.
+ *
+ * Author: Wietse Venema, Eindhoven University of Technology, The Netherlands.
+ */
+
+#ifndef lint
+static char sccsid[] = "@(#) inetcf.c 1.7 97/02/12 02:13:23";
+#endif
+
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <stdio.h>
+#include <errno.h>
+#include <string.h>
+
+extern int errno;
+extern void exit();
+
+#include "tcpd.h"
+#include "inetcf.h"
+
+ /*
+ * Network configuration files may live in unusual places. Here are some
+ * guesses. Shorter names follow longer ones.
+ */
+char *inet_files[] = {
+ "/private/etc/inetd.conf", /* NEXT */
+ "/etc/inet/inetd.conf", /* SYSV4 */
+ "/usr/etc/inetd.conf", /* IRIX?? */
+ "/etc/inetd.conf", /* BSD */
+ "/etc/net/tlid.conf", /* SYSV4?? */
+ "/etc/saf/tlid.conf", /* SYSV4?? */
+ "/etc/tlid.conf", /* SYSV4?? */
+ 0,
+};
+
+static void inet_chk();
+static char *base_name();
+
+ /*
+ * Structure with everything we know about a service.
+ */
+struct inet_ent {
+ struct inet_ent *next;
+ int type;
+ char name[1];
+};
+
+static struct inet_ent *inet_list = 0;
+
+static char whitespace[] = " \t\r\n";
+
+/* inet_conf - read in and examine inetd.conf (or tlid.conf) entries */
+
+char *inet_cfg(conf)
+char *conf;
+{
+ char buf[BUFSIZ];
+ FILE *fp;
+ char *service;
+ char *protocol;
+ char *user;
+ char *path;
+ char *arg0;
+ char *arg1;
+ struct tcpd_context saved_context;
+ char *percent_m();
+ int i;
+ struct stat st;
+
+ saved_context = tcpd_context;
+
+ /*
+ * The inetd.conf (or tlid.conf) information is so useful that we insist
+ * on its availability. When no file is given run a series of educated
+ * guesses.
+ */
+ if (conf != 0) {
+ if ((fp = fopen(conf, "r")) == 0) {
+ fprintf(stderr, percent_m(buf, "open %s: %m\n"), conf);
+ exit(1);
+ }
+ } else {
+ for (i = 0; inet_files[i] && (fp = fopen(inet_files[i], "r")) == 0; i++)
+ /* void */ ;
+ if (fp == 0) {
+ fprintf(stderr, "Cannot find your inetd.conf or tlid.conf file.\n");
+ fprintf(stderr, "Please specify its location.\n");
+ exit(1);
+ }
+ conf = inet_files[i];
+ check_path(conf, &st);
+ }
+
+ /*
+ * Process the file. After the 7.0 wrapper release it became clear that
+ * there are many more inetd.conf formats than the 8 systems that I had
+ * studied. EP/IX uses a two-line specification for rpc services; HP-UX
+ * permits long lines to be broken with backslash-newline.
+ */
+ tcpd_context.file = conf;
+ tcpd_context.line = 0;
+ while (xgets(buf, sizeof(buf), fp)) {
+ service = strtok(buf, whitespace); /* service */
+ if (service == 0 || *service == '#')
+ continue;
+ if (STR_NE(service, "stream") && STR_NE(service, "dgram"))
+ strtok((char *) 0, whitespace); /* endpoint */
+ protocol = strtok((char *) 0, whitespace);
+ (void) strtok((char *) 0, whitespace); /* wait */
+ if ((user = strtok((char *) 0, whitespace)) == 0)
+ continue;
+ if (user[0] == '/') { /* user */
+ path = user;
+ } else { /* path */
+ if ((path = strtok((char *) 0, whitespace)) == 0)
+ continue;
+ }
+ if (path[0] == '?') /* IRIX optional service */
+ path++;
+ if (STR_EQ(path, "internal"))
+ continue;
+ if (path[strspn(path, "-0123456789")] == 0) {
+
+ /*
+ * ConvexOS puts RPC version numbers before path names. Jukka
+ * Ukkonen <ukkonen@csc.fi>.
+ */
+ if ((path = strtok((char *) 0, whitespace)) == 0)
+ continue;
+ }
+ if ((arg0 = strtok((char *) 0, whitespace)) == 0) {
+ tcpd_warn("incomplete line");
+ continue;
+ }
+ if (arg0[strspn(arg0, "0123456789")] == 0) {
+
+ /*
+ * We're reading a tlid.conf file, the format is:
+ *
+ * ...stuff... path arg_count arguments mod_count modules
+ */
+ if ((arg0 = strtok((char *) 0, whitespace)) == 0) {
+ tcpd_warn("incomplete line");
+ continue;
+ }
+ }
+ if ((arg1 = strtok((char *) 0, whitespace)) == 0)
+ arg1 = "";
+
+ inet_chk(protocol, path, arg0, arg1);
+ }
+ fclose(fp);
+ tcpd_context = saved_context;
+ return (conf);
+}
+
+/* inet_chk - examine one inetd.conf (tlid.conf?) entry */
+
+static void inet_chk(protocol, path, arg0, arg1)
+char *protocol;
+char *path;
+char *arg0;
+char *arg1;
+{
+ char daemon[BUFSIZ];
+ struct stat st;
+ int wrap_status = WR_MAYBE;
+ char *base_name_path = base_name(path);
+ char *tcpd_proc_name = (arg0[0] == '/' ? base_name(arg0) : arg0);
+
+ /*
+ * Always warn when the executable does not exist or when it is not
+ * executable.
+ */
+ if (check_path(path, &st) < 0) {
+ tcpd_warn("%s: not found: %m", path);
+ } else if ((st.st_mode & 0100) == 0) {
+ tcpd_warn("%s: not executable", path);
+ }
+
+ /*
+ * Cheat on the miscd tests, nobody uses it anymore.
+ */
+ if (STR_EQ(base_name_path, "miscd")) {
+ inet_set(arg0, WR_YES);
+ return;
+ }
+
+ /*
+ * While we are here...
+ */
+ if (STR_EQ(tcpd_proc_name, "rexd") || STR_EQ(tcpd_proc_name, "rpc.rexd"))
+ tcpd_warn("%s may be an insecure service", tcpd_proc_name);
+
+ /*
+ * The tcpd program gets most of the attention.
+ */
+ if (STR_EQ(base_name_path, "tcpd")) {
+
+ if (STR_EQ(tcpd_proc_name, "tcpd"))
+ tcpd_warn("%s is recursively calling itself", tcpd_proc_name);
+
+ wrap_status = WR_YES;
+
+ /*
+ * Check: some sites install the wrapper set-uid.
+ */
+ if ((st.st_mode & 06000) != 0)
+ tcpd_warn("%s: file is set-uid or set-gid", path);
+
+ /*
+ * Check: some sites insert tcpd in inetd.conf, instead of replacing
+ * the daemon pathname.
+ */
+ if (arg0[0] == '/' && STR_EQ(tcpd_proc_name, base_name(arg1)))
+ tcpd_warn("%s inserted before %s", path, arg0);
+
+ /*
+ * Check: make sure files exist and are executable. On some systems
+ * the network daemons are set-uid so we cannot complain. Note that
+ * tcpd takes the basename only in case of absolute pathnames.
+ */
+ if (arg0[0] == '/') { /* absolute path */
+ if (check_path(arg0, &st) < 0) {
+ tcpd_warn("%s: not found: %m", arg0);
+ } else if ((st.st_mode & 0100) == 0) {
+ tcpd_warn("%s: not executable", arg0);
+ }
+ } else { /* look in REAL_DAEMON_DIR */
+ sprintf(daemon, "%s/%s", REAL_DAEMON_DIR, arg0);
+ if (check_path(daemon, &st) < 0) {
+ tcpd_warn("%s: not found in %s: %m",
+ arg0, REAL_DAEMON_DIR);
+ } else if ((st.st_mode & 0100) == 0) {
+ tcpd_warn("%s: not executable", daemon);
+ }
+ }
+
+ } else {
+
+ /*
+ * No tcpd program found. Perhaps they used the "simple installation"
+ * recipe. Look for a file with the same basename in REAL_DAEMON_DIR.
+ * Draw some conservative conclusions when a distinct file is found.
+ */
+ sprintf(daemon, "%s/%s", REAL_DAEMON_DIR, arg0);
+ if (STR_EQ(path, daemon)) {
+ wrap_status = WR_NOT;
+ } else if (check_path(daemon, &st) >= 0) {
+ wrap_status = WR_MAYBE;
+ } else if (errno == ENOENT) {
+ wrap_status = WR_NOT;
+ } else {
+ tcpd_warn("%s: file lookup: %m", daemon);
+ wrap_status = WR_MAYBE;
+ }
+ }
+
+ /*
+ * Alas, we cannot wrap rpc/tcp services.
+ */
+ if (wrap_status == WR_YES && STR_EQ(protocol, "rpc/tcp"))
+ tcpd_warn("%s: cannot wrap rpc/tcp services", tcpd_proc_name);
+
+ inet_set(tcpd_proc_name, wrap_status);
+}
+
+/* inet_set - remember service status */
+
+void inet_set(name, type)
+char *name;
+int type;
+{
+ struct inet_ent *ip =
+ (struct inet_ent *) malloc(sizeof(struct inet_ent) + strlen(name));
+
+ if (ip == 0) {
+ fprintf(stderr, "out of memory\n");
+ exit(1);
+ }
+ ip->next = inet_list;
+ strcpy(ip->name, name);
+ ip->type = type;
+ inet_list = ip;
+}
+
+/* inet_get - look up service status */
+
+int inet_get(name)
+char *name;
+{
+ struct inet_ent *ip;
+
+ if (inet_list == 0)
+ return (WR_MAYBE);
+
+ for (ip = inet_list; ip; ip = ip->next)
+ if (STR_EQ(ip->name, name))
+ return (ip->type);
+
+ return (-1);
+}
+
+/* base_name - compute last pathname component */
+
+static char *base_name(path)
+char *path;
+{
+ char *cp;
+
+ if ((cp = strrchr(path, '/')) != 0)
+ path = cp + 1;
+ return (path);
+}
diff --git a/contrib/tcp_wrappers/inetcf.h b/contrib/tcp_wrappers/inetcf.h
new file mode 100644
index 000000000000..0f1d77cb3d75
--- /dev/null
+++ b/contrib/tcp_wrappers/inetcf.h
@@ -0,0 +1,14 @@
+ /*
+ * @(#) inetcf.h 1.1 94/12/28 17:42:30
+ *
+ * Author: Wietse Venema, Eindhoven University of Technology, The Netherlands.
+ */
+
+extern char *inet_cfg(); /* read inetd.conf file */
+extern void inet_set(); /* remember internet service */
+extern int inet_get(); /* look up internet service */
+
+#define WR_UNKNOWN (-1) /* service unknown */
+#define WR_NOT 1 /* may not be wrapped */
+#define WR_MAYBE 2 /* may be wrapped */
+#define WR_YES 3 /* service is wrapped */
diff --git a/contrib/tcp_wrappers/misc.c b/contrib/tcp_wrappers/misc.c
new file mode 100644
index 000000000000..87a765379f43
--- /dev/null
+++ b/contrib/tcp_wrappers/misc.c
@@ -0,0 +1,87 @@
+ /*
+ * Misc routines that are used by tcpd and by tcpdchk.
+ *
+ * Author: Wietse Venema, Eindhoven University of Technology, The Netherlands.
+ */
+
+#ifndef lint
+static char sccsic[] = "@(#) misc.c 1.2 96/02/11 17:01:29";
+#endif
+
+#include <sys/types.h>
+#include <sys/param.h>
+#include <netinet/in.h>
+#include <arpa/inet.h>
+#include <stdio.h>
+#include <string.h>
+
+#include "tcpd.h"
+
+extern char *fgets();
+
+#ifndef INADDR_NONE
+#define INADDR_NONE (-1) /* XXX should be 0xffffffff */
+#endif
+
+/* xgets - fgets() with backslash-newline stripping */
+
+char *xgets(ptr, len, fp)
+char *ptr;
+int len;
+FILE *fp;
+{
+ int got;
+ char *start = ptr;
+
+ while (fgets(ptr, len, fp)) {
+ got = strlen(ptr);
+ if (got >= 1 && ptr[got - 1] == '\n') {
+ tcpd_context.line++;
+ if (got >= 2 && ptr[got - 2] == '\\') {
+ got -= 2;
+ } else {
+ return (start);
+ }
+ }
+ ptr += got;
+ len -= got;
+ ptr[0] = 0;
+ }
+ return (ptr > start ? start : 0);
+}
+
+/* split_at - break string at delimiter or return NULL */
+
+char *split_at(string, delimiter)
+char *string;
+int delimiter;
+{
+ char *cp;
+
+ if ((cp = strchr(string, delimiter)) != 0)
+ *cp++ = 0;
+ return (cp);
+}
+
+/* dot_quad_addr - convert dotted quad to internal form */
+
+unsigned long dot_quad_addr(str)
+char *str;
+{
+ int in_run = 0;
+ int runs = 0;
+ char *cp = str;
+
+ /* Count the number of runs of non-dot characters. */
+
+ while (*cp) {
+ if (*cp == '.') {
+ in_run = 0;
+ } else if (in_run == 0) {
+ in_run = 1;
+ runs++;
+ }
+ cp++;
+ }
+ return (runs == 4 ? inet_addr(str) : INADDR_NONE);
+}
diff --git a/contrib/tcp_wrappers/miscd.c b/contrib/tcp_wrappers/miscd.c
new file mode 100644
index 000000000000..1ab835c45061
--- /dev/null
+++ b/contrib/tcp_wrappers/miscd.c
@@ -0,0 +1,120 @@
+ /*
+ * Front end to the ULTRIX miscd service. The front end logs the remote host
+ * name and then invokes the real miscd daemon. Install as "/usr/etc/miscd",
+ * after renaming the real miscd daemon to the name defined with the
+ * REAL_MISCD macro.
+ *
+ * Connections and diagnostics are logged through syslog(3).
+ *
+ * The Ultrix miscd program implements (among others) the systat service, which
+ * pipes the output from who(1) to stdout. This information is potentially
+ * useful to systems crackers.
+ *
+ * Author: Wietse Venema, Eindhoven University of Technology, The Netherlands.
+ */
+
+#ifndef lint
+static char sccsid[] = "@(#) miscd.c 1.10 96/02/11 17:01:30";
+#endif
+
+/* System libraries. */
+
+#include <sys/types.h>
+#include <sys/param.h>
+#include <sys/stat.h>
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <stdio.h>
+#include <syslog.h>
+
+#ifndef MAXPATHNAMELEN
+#define MAXPATHNAMELEN BUFSIZ
+#endif
+
+#ifndef STDIN_FILENO
+#define STDIN_FILENO 0
+#endif
+
+/* Local stuff. */
+
+#include "patchlevel.h"
+#include "tcpd.h"
+
+int allow_severity = SEVERITY; /* run-time adjustable */
+int deny_severity = LOG_WARNING; /* ditto */
+
+main(argc, argv)
+int argc;
+char **argv;
+{
+ struct request_info request;
+ char path[MAXPATHNAMELEN];
+
+ /* Attempt to prevent the creation of world-writable files. */
+
+#ifdef DAEMON_UMASK
+ umask(DAEMON_UMASK);
+#endif
+
+ /*
+ * Open a channel to the syslog daemon. Older versions of openlog()
+ * require only two arguments.
+ */
+
+#ifdef LOG_MAIL
+ (void) openlog(argv[0], LOG_PID, FACILITY);
+#else
+ (void) openlog(argv[0], LOG_PID);
+#endif
+
+ /*
+ * Find out the endpoint addresses of this conversation. Host name
+ * lookups and double checks will be done on demand.
+ */
+
+ request_init(&request, RQ_DAEMON, argv[0], RQ_FILE, STDIN_FILENO, 0);
+ fromhost(&request);
+
+ /*
+ * Optionally look up and double check the remote host name. Sites
+ * concerned with security may choose to refuse connections from hosts
+ * that pretend to have someone elses host name.
+ */
+
+#ifdef PARANOID
+ if (STR_EQ(eval_hostname(request.client), paranoid))
+ refuse(&request);
+#endif
+
+ /*
+ * The BSD rlogin and rsh daemons that came out after 4.3 BSD disallow
+ * socket options at the IP level. They do so for a good reason.
+ * Unfortunately, we cannot use this with SunOS 4.1.x because the
+ * getsockopt() system call can panic the system.
+ */
+
+#ifdef KILL_IP_OPTIONS
+ fix_options(&request);
+#endif
+
+ /*
+ * Check whether this host can access the service in argv[0]. The
+ * access-control code invokes optional shell commands as specified in
+ * the access-control tables.
+ */
+
+#ifdef HOSTS_ACCESS
+ if (!hosts_access(&request))
+ refuse(&request);
+#endif
+
+ /* Report request and invoke the real daemon program. */
+
+ syslog(allow_severity, "connect from %s", eval_client(&request));
+ sprintf(path, "%s/miscd", REAL_DAEMON_DIR);
+ closelog();
+ (void) execv(path, argv);
+ syslog(LOG_ERR, "error: cannot execute %s: %m", path);
+ clean_exit(&request);
+ /* NOTREACHED */
+}
diff --git a/contrib/tcp_wrappers/mystdarg.h b/contrib/tcp_wrappers/mystdarg.h
new file mode 100644
index 000000000000..36bdf696f1a5
--- /dev/null
+++ b/contrib/tcp_wrappers/mystdarg.h
@@ -0,0 +1,19 @@
+
+ /*
+ * What follows is an attempt to unify varargs.h and stdarg.h. I'd rather
+ * have this than #ifdefs all over the code.
+ */
+
+#ifdef __STDC__
+#include <stdarg.h>
+#define VARARGS(func,type,arg) func(type arg, ...)
+#define VASTART(ap,type,name) va_start(ap,name)
+#define VAEND(ap) va_end(ap)
+#else
+#include <varargs.h>
+#define VARARGS(func,type,arg) func(va_alist) va_dcl
+#define VASTART(ap,type,name) {type name; va_start(ap); name = va_arg(ap, type)
+#define VAEND(ap) va_end(ap);}
+#endif
+
+extern char *percent_m();
diff --git a/contrib/tcp_wrappers/myvsyslog.c b/contrib/tcp_wrappers/myvsyslog.c
new file mode 100644
index 000000000000..20401f1f371b
--- /dev/null
+++ b/contrib/tcp_wrappers/myvsyslog.c
@@ -0,0 +1,33 @@
+ /*
+ * vsyslog() for sites without. In order to enable this code, build with
+ * -Dvsyslog=myvsyslog. We use a different name so that no accidents will
+ * happen when vsyslog() exists. On systems with vsyslog(), syslog() is
+ * typically implemented in terms of vsyslog().
+ *
+ * Author: Wietse Venema, Eindhoven University of Technology, The Netherlands.
+ */
+
+#ifndef lint
+static char sccsid[] = "@(#) myvsyslog.c 1.1 94/12/28 17:42:33";
+#endif
+
+#ifdef vsyslog
+
+#include <stdio.h>
+
+#include "tcpd.h"
+#include "mystdarg.h"
+
+myvsyslog(severity, format, ap)
+int severity;
+char *format;
+va_list ap;
+{
+ char fbuf[BUFSIZ];
+ char obuf[3 * STRING_LENGTH];
+
+ vsprintf(obuf, percent_m(fbuf, format), ap);
+ syslog(severity, "%s", obuf);
+}
+
+#endif
diff --git a/contrib/tcp_wrappers/ncr.c b/contrib/tcp_wrappers/ncr.c
new file mode 100644
index 000000000000..b903fb85a565
--- /dev/null
+++ b/contrib/tcp_wrappers/ncr.c
@@ -0,0 +1,81 @@
+ /*
+ * This part for NCR UNIX with is from Andrew Maffei (arm@aqua.whoi.edu). It
+ * assumes TLI throughout. In order to look up endpoint address information
+ * we must talk to the "timod" streams module. For some reason "timod" wants
+ * to sit directly on top of the device driver. Therefore we pop off all
+ * streams modules except the driver, install the "timod" module so that we
+ * can figure out network addresses, and then restore the original state.
+ */
+
+#ifndef lint
+static char sccsid[] = "@(#) ncr.c 1.1 94/12/28 17:42:34";
+#endif
+
+#include <sys/types.h>
+#include <stdio.h>
+#include <syslog.h>
+#include <sys/tiuser.h>
+#include <stropts.h>
+#include <sys/conf.h>
+
+#include "tcpd.h"
+
+#define MAX_MODULE_COUNT 10 /* XXX */
+
+/* fromhost - tear down the streams stack then rebuild it */
+
+void fromhost(request)
+struct request_info *request;
+{
+ int i;
+ int num_mod;
+ struct str_list str_list;
+ struct str_mlist mod_buffer[MAX_MODULE_COUNT];
+ int fd = request->fd;
+
+ str_list.sl_nmods = MAX_MODULE_COUNT;
+ str_list.sl_modlist = &mod_buffer[0];
+
+ /*
+ * On systems with WIN streams support we have to be careful about what
+ * is on the stream we are passed. This code POPs off all modules above
+ * the pseudo driver, pushes timod, gets the host address information,
+ * pops timod and then pushes all modules back on the stream.
+ *
+ * Some state may be lost in this process. /usr/etc/tlid seems to do special
+ * things to the stream depending on the TCP port being serviced. (not a
+ * very nice thing to do!). It is unclear what to do if this code breaks
+ * - the stream may be left in an unknown condition.
+ */
+ if ((num_mod = ioctl(fd, I_LIST, NULL)) < 0)
+ tcpd_warn("fromhost: LIST failed: %m");
+ if (ioctl(fd, I_LIST, &str_list) < 0)
+ tcpd_warn("fromhost: LIST failed: %m");
+
+ /*
+ * POP stream modules except for the driver.
+ */
+ for (i = 0; i < num_mod - 1; i++)
+ if (ioctl(fd, I_POP, 0) < 0)
+ tcpd_warn("fromhost: POP %s: %m", mod_buffer[i].l_name);
+
+ /*
+ * PUSH timod so that host address ioctls can be executed.
+ */
+ if (ioctl(fd, I_PUSH, "timod") < 0)
+ tcpd_warn("fromhost: PUSH timod: %m");
+ tli_host(request);
+
+ /*
+ * POP timod, we're done with it now.
+ */
+ if (ioctl(fd, I_POP, 0) < 0)
+ tcpd_warn("fromhost: POP timod: %m");
+
+ /*
+ * Restore stream modules.
+ */
+ for (i = num_mod - 2; i >= 0; i--)
+ if (ioctl(fd, I_PUSH, mod_buffer[i].l_name) < 0)
+ tcpd_warn("fromhost: PUSH %s: %m", mod_buffer[i].l_name);
+}
diff --git a/contrib/tcp_wrappers/options.c b/contrib/tcp_wrappers/options.c
new file mode 100644
index 000000000000..4fc6c9468732
--- /dev/null
+++ b/contrib/tcp_wrappers/options.c
@@ -0,0 +1,621 @@
+ /*
+ * General skeleton for adding options to the access control language. The
+ * features offered by this module are documented in the hosts_options(5)
+ * manual page (source file: hosts_options.5, "nroff -man" format).
+ *
+ * Notes and warnings for those who want to add features:
+ *
+ * In case of errors, abort options processing and deny access. There are too
+ * many irreversible side effects to make error recovery feasible. For
+ * example, it makes no sense to continue after we have already changed the
+ * userid.
+ *
+ * In case of errors, do not terminate the process: the routines might be
+ * called from a long-running daemon that should run forever. Instead, call
+ * tcpd_jump() which does a non-local goto back into the hosts_access()
+ * routine.
+ *
+ * In case of severe errors, use clean_exit() instead of directly calling
+ * exit(), or the inetd may loop on an UDP request.
+ *
+ * In verification mode (for example, with the "tcpdmatch" command) the
+ * "dry_run" flag is set. In this mode, an option function should just "say"
+ * what it is going to do instead of really doing it.
+ *
+ * Some option functions do not return (for example, the twist option passes
+ * control to another program). In verification mode (dry_run flag is set)
+ * such options should clear the "dry_run" flag to inform the caller of this
+ * course of action.
+ */
+
+#ifndef lint
+static char sccsid[] = "@(#) options.c 1.17 96/02/11 17:01:31";
+#endif
+
+/* System libraries. */
+
+#include <sys/types.h>
+#include <sys/param.h>
+#include <sys/socket.h>
+#include <sys/stat.h>
+#include <netinet/in.h>
+#include <netdb.h>
+#include <stdio.h>
+#include <syslog.h>
+#include <pwd.h>
+#include <grp.h>
+#include <ctype.h>
+#include <setjmp.h>
+#include <string.h>
+
+#ifndef MAXPATHNAMELEN
+#define MAXPATHNAMELEN BUFSIZ
+#endif
+
+/* Local stuff. */
+
+#include "tcpd.h"
+
+/* Options runtime support. */
+
+int dry_run = 0; /* flag set in verification mode */
+extern jmp_buf tcpd_buf; /* tcpd_jump() support */
+
+/* Options parser support. */
+
+static char whitespace_eq[] = "= \t\r\n";
+#define whitespace (whitespace_eq + 1)
+
+static char *get_field(); /* chew :-delimited field off string */
+static char *chop_string(); /* strip leading and trailing blanks */
+
+/* List of functions that implement the options. Add yours here. */
+
+static void user_option(); /* execute "user name.group" option */
+static void group_option(); /* execute "group name" option */
+static void umask_option(); /* execute "umask mask" option */
+static void linger_option(); /* execute "linger time" option */
+static void keepalive_option(); /* execute "keepalive" option */
+static void spawn_option(); /* execute "spawn command" option */
+static void twist_option(); /* execute "twist command" option */
+static void rfc931_option(); /* execute "rfc931" option */
+static void setenv_option(); /* execute "setenv name value" */
+static void nice_option(); /* execute "nice" option */
+static void severity_option(); /* execute "severity value" */
+static void allow_option(); /* execute "allow" option */
+static void deny_option(); /* execute "deny" option */
+static void banners_option(); /* execute "banners path" option */
+
+/* Structure of the options table. */
+
+struct option {
+ char *name; /* keyword name, case is ignored */
+ void (*func) (); /* function that does the real work */
+ int flags; /* see below... */
+};
+
+#define NEED_ARG (1<<1) /* option requires argument */
+#define USE_LAST (1<<2) /* option must be last */
+#define OPT_ARG (1<<3) /* option has optional argument */
+#define EXPAND_ARG (1<<4) /* do %x expansion on argument */
+
+#define need_arg(o) ((o)->flags & NEED_ARG)
+#define opt_arg(o) ((o)->flags & OPT_ARG)
+#define permit_arg(o) ((o)->flags & (NEED_ARG | OPT_ARG))
+#define use_last(o) ((o)->flags & USE_LAST)
+#define expand_arg(o) ((o)->flags & EXPAND_ARG)
+
+/* List of known keywords. Add yours here. */
+
+static struct option option_table[] = {
+ "user", user_option, NEED_ARG,
+ "group", group_option, NEED_ARG,
+ "umask", umask_option, NEED_ARG,
+ "linger", linger_option, NEED_ARG,
+ "keepalive", keepalive_option, 0,
+ "spawn", spawn_option, NEED_ARG | EXPAND_ARG,
+ "twist", twist_option, NEED_ARG | EXPAND_ARG | USE_LAST,
+ "rfc931", rfc931_option, OPT_ARG,
+ "setenv", setenv_option, NEED_ARG | EXPAND_ARG,
+ "nice", nice_option, OPT_ARG,
+ "severity", severity_option, NEED_ARG,
+ "allow", allow_option, USE_LAST,
+ "deny", deny_option, USE_LAST,
+ "banners", banners_option, NEED_ARG,
+ 0,
+};
+
+/* process_options - process access control options */
+
+void process_options(options, request)
+char *options;
+struct request_info *request;
+{
+ char *key;
+ char *value;
+ char *curr_opt;
+ char *next_opt;
+ struct option *op;
+ char bf[BUFSIZ];
+
+ for (curr_opt = get_field(options); curr_opt; curr_opt = next_opt) {
+ next_opt = get_field((char *) 0);
+
+ /*
+ * Separate the option into name and value parts. For backwards
+ * compatibility we ignore exactly one '=' between name and value.
+ */
+ curr_opt = chop_string(curr_opt);
+ if (*(value = curr_opt + strcspn(curr_opt, whitespace_eq))) {
+ if (*value != '=') {
+ *value++ = 0;
+ value += strspn(value, whitespace);
+ }
+ if (*value == '=') {
+ *value++ = 0;
+ value += strspn(value, whitespace);
+ }
+ }
+ if (*value == 0)
+ value = 0;
+ key = curr_opt;
+
+ /*
+ * Disallow missing option names (and empty option fields).
+ */
+ if (*key == 0)
+ tcpd_jump("missing option name");
+
+ /*
+ * Lookup the option-specific info and do some common error checks.
+ * Delegate option-specific processing to the specific functions.
+ */
+
+ for (op = option_table; op->name && STR_NE(op->name, key); op++)
+ /* VOID */ ;
+ if (op->name == 0)
+ tcpd_jump("bad option name: \"%s\"", key);
+ if (!value && need_arg(op))
+ tcpd_jump("option \"%s\" requires value", key);
+ if (value && !permit_arg(op))
+ tcpd_jump("option \"%s\" requires no value", key);
+ if (next_opt && use_last(op))
+ tcpd_jump("option \"%s\" must be at end", key);
+ if (value && expand_arg(op))
+ value = chop_string(percent_x(bf, sizeof(bf), value, request));
+ if (hosts_access_verbose)
+ syslog(LOG_DEBUG, "option: %s %s", key, value ? value : "");
+ (*(op->func)) (value, request);
+ }
+}
+
+/* allow_option - grant access */
+
+/* ARGSUSED */
+
+static void allow_option(value, request)
+char *value;
+struct request_info *request;
+{
+ longjmp(tcpd_buf, AC_PERMIT);
+}
+
+/* deny_option - deny access */
+
+/* ARGSUSED */
+
+static void deny_option(value, request)
+char *value;
+struct request_info *request;
+{
+ longjmp(tcpd_buf, AC_DENY);
+}
+
+/* banners_option - expand %<char>, terminate each line with CRLF */
+
+static void banners_option(value, request)
+char *value;
+struct request_info *request;
+{
+ char path[MAXPATHNAMELEN];
+ char ibuf[BUFSIZ];
+ char obuf[2 * BUFSIZ];
+ struct stat st;
+ int ch;
+ FILE *fp;
+
+ sprintf(path, "%s/%s", value, eval_daemon(request));
+ if ((fp = fopen(path, "r")) != 0) {
+ while ((ch = fgetc(fp)) == 0)
+ write(request->fd, "", 1);
+ ungetc(ch, fp);
+ while (fgets(ibuf, sizeof(ibuf) - 1, fp)) {
+ if (split_at(ibuf, '\n'))
+ strcat(ibuf, "\r\n");
+ percent_x(obuf, sizeof(obuf), ibuf, request);
+ write(request->fd, obuf, strlen(obuf));
+ }
+ fclose(fp);
+ } else if (stat(value, &st) < 0) {
+ tcpd_warn("%s: %m", value);
+ }
+}
+
+/* group_option - switch group id */
+
+/* ARGSUSED */
+
+static void group_option(value, request)
+char *value;
+struct request_info *request;
+{
+ struct group *grp;
+ struct group *getgrnam();
+
+ if ((grp = getgrnam(value)) == 0)
+ tcpd_jump("unknown group: \"%s\"", value);
+ endgrent();
+
+ if (dry_run == 0 && setgid(grp->gr_gid))
+ tcpd_jump("setgid(%s): %m", value);
+}
+
+/* user_option - switch user id */
+
+/* ARGSUSED */
+
+static void user_option(value, request)
+char *value;
+struct request_info *request;
+{
+ struct passwd *pwd;
+ struct passwd *getpwnam();
+ char *group;
+
+ if ((group = split_at(value, '.')) != 0)
+ group_option(group, request);
+ if ((pwd = getpwnam(value)) == 0)
+ tcpd_jump("unknown user: \"%s\"", value);
+ endpwent();
+
+ if (dry_run == 0 && setuid(pwd->pw_uid))
+ tcpd_jump("setuid(%s): %m", value);
+}
+
+/* umask_option - set file creation mask */
+
+/* ARGSUSED */
+
+static void umask_option(value, request)
+char *value;
+struct request_info *request;
+{
+ unsigned mask;
+ char junk;
+
+ if (sscanf(value, "%o%c", &mask, &junk) != 1 || (mask & 0777) != mask)
+ tcpd_jump("bad umask value: \"%s\"", value);
+ (void) umask(mask);
+}
+
+/* spawn_option - spawn a shell command and wait */
+
+/* ARGSUSED */
+
+static void spawn_option(value, request)
+char *value;
+struct request_info *request;
+{
+ if (dry_run == 0)
+ shell_cmd(value);
+}
+
+/* linger_option - set the socket linger time (Marc Boucher <marc@cam.org>) */
+
+/* ARGSUSED */
+
+static void linger_option(value, request)
+char *value;
+struct request_info *request;
+{
+ struct linger linger;
+ char junk;
+
+ if (sscanf(value, "%d%c", &linger.l_linger, &junk) != 1
+ || linger.l_linger < 0)
+ tcpd_jump("bad linger value: \"%s\"", value);
+ if (dry_run == 0) {
+ linger.l_onoff = (linger.l_linger != 0);
+ if (setsockopt(request->fd, SOL_SOCKET, SO_LINGER, (char *) &linger,
+ sizeof(linger)) < 0)
+ tcpd_warn("setsockopt SO_LINGER %d: %m", linger.l_linger);
+ }
+}
+
+/* keepalive_option - set the socket keepalive option */
+
+/* ARGSUSED */
+
+static void keepalive_option(value, request)
+char *value;
+struct request_info *request;
+{
+ static int on = 1;
+
+ if (dry_run == 0 && setsockopt(request->fd, SOL_SOCKET, SO_KEEPALIVE,
+ (char *) &on, sizeof(on)) < 0)
+ tcpd_warn("setsockopt SO_KEEPALIVE: %m");
+}
+
+/* nice_option - set nice value */
+
+/* ARGSUSED */
+
+static void nice_option(value, request)
+char *value;
+struct request_info *request;
+{
+ int niceval = 10;
+ char junk;
+
+ if (value != 0 && sscanf(value, "%d%c", &niceval, &junk) != 1)
+ tcpd_jump("bad nice value: \"%s\"", value);
+ if (dry_run == 0 && nice(niceval) < 0)
+ tcpd_warn("nice(%d): %m", niceval);
+}
+
+/* twist_option - replace process by shell command */
+
+static void twist_option(value, request)
+char *value;
+struct request_info *request;
+{
+ char *error;
+
+ if (dry_run != 0) {
+ dry_run = 0;
+ } else {
+ if (resident > 0)
+ tcpd_jump("twist option in resident process");
+
+ syslog(deny_severity, "twist %s to %s", eval_client(request), value);
+
+ /* Before switching to the shell, set up stdin, stdout and stderr. */
+
+#define maybe_dup2(from, to) ((from == to) ? to : (close(to), dup(from)))
+
+ if (maybe_dup2(request->fd, 0) != 0 ||
+ maybe_dup2(request->fd, 1) != 1 ||
+ maybe_dup2(request->fd, 2) != 2) {
+ error = "twist_option: dup: %m";
+ } else {
+ if (request->fd > 2)
+ close(request->fd);
+ (void) execl("/bin/sh", "sh", "-c", value, (char *) 0);
+ error = "twist_option: /bin/sh: %m";
+ }
+
+ /* Something went wrong: we MUST terminate the process. */
+
+ tcpd_warn(error);
+ clean_exit(request);
+ }
+}
+
+/* rfc931_option - look up remote user name */
+
+static void rfc931_option(value, request)
+char *value;
+struct request_info *request;
+{
+ int timeout;
+ char junk;
+
+ if (value != 0) {
+ if (sscanf(value, "%d%c", &timeout, &junk) != 1 || timeout <= 0)
+ tcpd_jump("bad rfc931 timeout: \"%s\"", value);
+ rfc931_timeout = timeout;
+ }
+ (void) eval_user(request);
+}
+
+/* setenv_option - set environment variable */
+
+/* ARGSUSED */
+
+static void setenv_option(value, request)
+char *value;
+struct request_info *request;
+{
+ char *var_value;
+
+ if (*(var_value = value + strcspn(value, whitespace)))
+ *var_value++ = 0;
+ if (setenv(chop_string(value), chop_string(var_value), 1))
+ tcpd_jump("memory allocation failure");
+}
+
+ /*
+ * The severity option goes last because it comes with a huge amount of ugly
+ * #ifdefs and tables.
+ */
+
+struct syslog_names {
+ char *name;
+ int value;
+};
+
+static struct syslog_names log_fac[] = {
+#ifdef LOG_KERN
+ "kern", LOG_KERN,
+#endif
+#ifdef LOG_USER
+ "user", LOG_USER,
+#endif
+#ifdef LOG_MAIL
+ "mail", LOG_MAIL,
+#endif
+#ifdef LOG_DAEMON
+ "daemon", LOG_DAEMON,
+#endif
+#ifdef LOG_AUTH
+ "auth", LOG_AUTH,
+#endif
+#ifdef LOG_LPR
+ "lpr", LOG_LPR,
+#endif
+#ifdef LOG_NEWS
+ "news", LOG_NEWS,
+#endif
+#ifdef LOG_UUCP
+ "uucp", LOG_UUCP,
+#endif
+#ifdef LOG_CRON
+ "cron", LOG_CRON,
+#endif
+#ifdef LOG_LOCAL0
+ "local0", LOG_LOCAL0,
+#endif
+#ifdef LOG_LOCAL1
+ "local1", LOG_LOCAL1,
+#endif
+#ifdef LOG_LOCAL2
+ "local2", LOG_LOCAL2,
+#endif
+#ifdef LOG_LOCAL3
+ "local3", LOG_LOCAL3,
+#endif
+#ifdef LOG_LOCAL4
+ "local4", LOG_LOCAL4,
+#endif
+#ifdef LOG_LOCAL5
+ "local5", LOG_LOCAL5,
+#endif
+#ifdef LOG_LOCAL6
+ "local6", LOG_LOCAL6,
+#endif
+#ifdef LOG_LOCAL7
+ "local7", LOG_LOCAL7,
+#endif
+ 0,
+};
+
+static struct syslog_names log_sev[] = {
+#ifdef LOG_EMERG
+ "emerg", LOG_EMERG,
+#endif
+#ifdef LOG_ALERT
+ "alert", LOG_ALERT,
+#endif
+#ifdef LOG_CRIT
+ "crit", LOG_CRIT,
+#endif
+#ifdef LOG_ERR
+ "err", LOG_ERR,
+#endif
+#ifdef LOG_WARNING
+ "warning", LOG_WARNING,
+#endif
+#ifdef LOG_NOTICE
+ "notice", LOG_NOTICE,
+#endif
+#ifdef LOG_INFO
+ "info", LOG_INFO,
+#endif
+#ifdef LOG_DEBUG
+ "debug", LOG_DEBUG,
+#endif
+ 0,
+};
+
+/* severity_map - lookup facility or severity value */
+
+static int severity_map(table, name)
+struct syslog_names *table;
+char *name;
+{
+ struct syslog_names *t;
+
+ for (t = table; t->name; t++)
+ if (STR_EQ(t->name, name))
+ return (t->value);
+ tcpd_jump("bad syslog facility or severity: \"%s\"", name);
+ /* NOTREACHED */
+}
+
+/* severity_option - change logging severity for this event (Dave Mitchell) */
+
+/* ARGSUSED */
+
+static void severity_option(value, request)
+char *value;
+struct request_info *request;
+{
+ char *level = split_at(value, '.');
+
+ allow_severity = deny_severity = level ?
+ severity_map(log_fac, value) | severity_map(log_sev, level) :
+ severity_map(log_sev, value);
+}
+
+/* get_field - return pointer to next field in string */
+
+static char *get_field(string)
+char *string;
+{
+ static char *last = "";
+ char *src;
+ char *dst;
+ char *ret;
+ int ch;
+
+ /*
+ * This function returns pointers to successive fields within a given
+ * string. ":" is the field separator; warn if the rule ends in one. It
+ * replaces a "\:" sequence by ":", without treating the result of
+ * substitution as field terminator. A null argument means resume search
+ * where the previous call terminated. This function destroys its
+ * argument.
+ *
+ * Work from explicit source or from memory. While processing \: we
+ * overwrite the input. This way we do not have to maintain buffers for
+ * copies of input fields.
+ */
+
+ src = dst = ret = (string ? string : last);
+ if (src[0] == 0)
+ return (0);
+
+ while (ch = *src) {
+ if (ch == ':') {
+ if (*++src == 0)
+ tcpd_warn("rule ends in \":\"");
+ break;
+ }
+ if (ch == '\\' && src[1] == ':')
+ src++;
+ *dst++ = *src++;
+ }
+ last = src;
+ *dst = 0;
+ return (ret);
+}
+
+/* chop_string - strip leading and trailing blanks from string */
+
+static char *chop_string(string)
+register char *string;
+{
+ char *start = 0;
+ char *end;
+ char *cp;
+
+ for (cp = string; *cp; cp++) {
+ if (!isspace(*cp)) {
+ if (start == 0)
+ start = cp;
+ end = cp;
+ }
+ }
+ return (start ? (end[1] = 0, start) : cp);
+}
diff --git a/contrib/tcp_wrappers/patchlevel.h b/contrib/tcp_wrappers/patchlevel.h
new file mode 100644
index 000000000000..c523265e384e
--- /dev/null
+++ b/contrib/tcp_wrappers/patchlevel.h
@@ -0,0 +1,3 @@
+#ifndef lint
+static char patchlevel[] = "@(#) patchlevel 7.6 97/03/21 19:27:23";
+#endif
diff --git a/contrib/tcp_wrappers/percent_m.c b/contrib/tcp_wrappers/percent_m.c
new file mode 100644
index 000000000000..bb11b22dd81f
--- /dev/null
+++ b/contrib/tcp_wrappers/percent_m.c
@@ -0,0 +1,43 @@
+ /*
+ * Replace %m by system error message.
+ *
+ * Author: Wietse Venema, Eindhoven University of Technology, The Netherlands.
+ */
+
+#ifndef lint
+static char sccsid[] = "@(#) percent_m.c 1.1 94/12/28 17:42:37";
+#endif
+
+#include <stdio.h>
+#include <errno.h>
+#include <string.h>
+
+extern int errno;
+#ifndef SYS_ERRLIST_DEFINED
+extern char *sys_errlist[];
+extern int sys_nerr;
+#endif
+
+#include "mystdarg.h"
+
+char *percent_m(obuf, ibuf)
+char *obuf;
+char *ibuf;
+{
+ char *bp = obuf;
+ char *cp = ibuf;
+
+ while (*bp = *cp)
+ if (*cp == '%' && cp[1] == 'm') {
+ if (errno < sys_nerr && errno > 0) {
+ strcpy(bp, sys_errlist[errno]);
+ } else {
+ sprintf(bp, "Unknown error %d", errno);
+ }
+ bp += strlen(bp);
+ cp += 2;
+ } else {
+ bp++, cp++;
+ }
+ return (obuf);
+}
diff --git a/contrib/tcp_wrappers/percent_x.c b/contrib/tcp_wrappers/percent_x.c
new file mode 100644
index 000000000000..c95a1ea4141e
--- /dev/null
+++ b/contrib/tcp_wrappers/percent_x.c
@@ -0,0 +1,86 @@
+ /*
+ * percent_x() takes a string and performs %<char> expansions. It aborts the
+ * program when the expansion would overflow the output buffer. The result
+ * of %<char> expansion may be passed on to a shell process. For this
+ * reason, characters with a special meaning to shells are replaced by
+ * underscores.
+ *
+ * Diagnostics are reported through syslog(3).
+ *
+ * Author: Wietse Venema, Eindhoven University of Technology, The Netherlands.
+ */
+
+#ifndef lint
+static char sccsid[] = "@(#) percent_x.c 1.4 94/12/28 17:42:37";
+#endif
+
+/* System libraries. */
+
+#include <stdio.h>
+#include <syslog.h>
+#include <string.h>
+
+extern void exit();
+
+/* Local stuff. */
+
+#include "tcpd.h"
+
+/* percent_x - do %<char> expansion, abort if result buffer is too small */
+
+char *percent_x(result, result_len, string, request)
+char *result;
+int result_len;
+char *string;
+struct request_info *request;
+{
+ char *bp = result;
+ char *end = result + result_len - 1; /* end of result buffer */
+ char *expansion;
+ int expansion_len;
+ static char ok_chars[] = "1234567890!@%-_=+:,./\
+abcdefghijklmnopqrstuvwxyz\
+ABCDEFGHIJKLMNOPQRSTUVWXYZ";
+ char *str = string;
+ char *cp;
+ int ch;
+
+ /*
+ * Warning: we may be called from a child process or after pattern
+ * matching, so we cannot use clean_exit() or tcpd_jump().
+ */
+
+ while (*str) {
+ if (*str == '%' && (ch = str[1]) != 0) {
+ str += 2;
+ expansion =
+ ch == 'a' ? eval_hostaddr(request->client) :
+ ch == 'A' ? eval_hostaddr(request->server) :
+ ch == 'c' ? eval_client(request) :
+ ch == 'd' ? eval_daemon(request) :
+ ch == 'h' ? eval_hostinfo(request->client) :
+ ch == 'H' ? eval_hostinfo(request->server) :
+ ch == 'n' ? eval_hostname(request->client) :
+ ch == 'N' ? eval_hostname(request->server) :
+ ch == 'p' ? eval_pid(request) :
+ ch == 's' ? eval_server(request) :
+ ch == 'u' ? eval_user(request) :
+ ch == '%' ? "%" : (tcpd_warn("unrecognized %%%c", ch), "");
+ for (cp = expansion; *(cp += strspn(cp, ok_chars)); /* */ )
+ *cp = '_';
+ expansion_len = cp - expansion;
+ } else {
+ expansion = str++;
+ expansion_len = 1;
+ }
+ if (bp + expansion_len >= end) {
+ tcpd_warn("percent_x: expansion too long: %.30s...", result);
+ sleep(5);
+ exit(0);
+ }
+ memcpy(bp, expansion, expansion_len);
+ bp += expansion_len;
+ }
+ *bp = 0;
+ return (result);
+}
diff --git a/contrib/tcp_wrappers/printf.ck b/contrib/tcp_wrappers/printf.ck
new file mode 100644
index 000000000000..d53412b7371b
--- /dev/null
+++ b/contrib/tcp_wrappers/printf.ck
@@ -0,0 +1,3 @@
+syslog 1 0
+tcpd_warn 0 0
+tcpd_jump 0 0
diff --git a/contrib/tcp_wrappers/ptx.c b/contrib/tcp_wrappers/ptx.c
new file mode 100644
index 000000000000..b9c312b82cdc
--- /dev/null
+++ b/contrib/tcp_wrappers/ptx.c
@@ -0,0 +1,103 @@
+ /*
+ * The Dynix/PTX TLI implementation is not quite compatible with System V
+ * Release 4. Some important functions are not present so we are limited to
+ * IP-based services.
+ *
+ * Diagnostics are reported through syslog(3).
+ *
+ * Author: Wietse Venema, Eindhoven University of Technology, The Netherlands.
+ */
+
+#ifndef lint
+static char sccsid[] = "@(#) ptx.c 1.3 94/12/28 17:42:38";
+#endif
+
+#ifdef PTX
+
+/* System libraries. */
+
+#include <sys/types.h>
+#include <sys/tiuser.h>
+#include <sys/socket.h>
+#include <stropts.h>
+#include <netinet/in.h>
+#include <netdb.h>
+#include <stdio.h>
+#include <syslog.h>
+
+/* Local stuff. */
+
+#include "tcpd.h"
+
+/* Forward declarations. */
+
+static void ptx_sink();
+
+/* tli_host - determine TLI endpoint info, PTX version */
+
+void tli_host(request)
+struct request_info *request;
+{
+ static struct sockaddr_in client;
+ static struct sockaddr_in server;
+
+ /*
+ * getpeerinaddr() was suggested by someone at Sequent. It seems to work
+ * with connection-oriented (TCP) services such as rlogind and telnetd,
+ * but it returns 0.0.0.0 with datagram (UDP) services. No problem: UDP
+ * needs special treatment anyway, in case we must refuse service.
+ */
+
+ if (getpeerinaddr(request->fd, &client, sizeof(client)) == 0
+ && client.sin_addr.s_addr != 0) {
+ request->client->sin = &client;
+ if (getmyinaddr(request->fd, &server, sizeof(server)) == 0) {
+ request->server->sin = &server;
+ } else {
+ tcpd_warn("warning: getmyinaddr: %m");
+ }
+ sock_methods(request);
+
+ } else {
+
+ /*
+ * Another suggestion was to temporarily switch to the socket
+ * interface, identify the endpoint addresses with socket calls, then
+ * to switch back to TLI. This seems to works OK with UDP services,
+ * which is exactly what we should be looking at right now.
+ */
+
+#define SWAP_MODULE(f, old, new) (ioctl(f, I_POP, old), ioctl(f, I_PUSH, new))
+
+ if (SWAP_MODULE(request->fd, "timod", "sockmod") != 0)
+ tcpd_warn("replace timod by sockmod: %m");
+ sock_host(request);
+ if (SWAP_MODULE(request->fd, "sockmod", "timod") != 0)
+ tcpd_warn("replace sockmod by timod: %m");
+ if (request->sink != 0)
+ request->sink = ptx_sink;
+ }
+}
+
+/* ptx_sink - absorb unreceived IP datagram */
+
+static void ptx_sink(fd)
+int fd;
+{
+ char buf[BUFSIZ];
+ struct sockaddr sa;
+ int size = sizeof(sa);
+
+ /*
+ * Eat up the not-yet received datagram. Where needed, switch to the
+ * socket programming interface.
+ */
+
+ if (ioctl(fd, I_FIND, "timod") != 0)
+ ioctl(fd, I_POP, "timod");
+ if (ioctl(fd, I_FIND, "sockmod") == 0)
+ ioctl(fd, I_PUSH, "sockmod");
+ (void) recvfrom(fd, buf, sizeof(buf), 0, &sa, &size);
+}
+
+#endif /* PTX */
diff --git a/contrib/tcp_wrappers/refuse.c b/contrib/tcp_wrappers/refuse.c
new file mode 100644
index 000000000000..ccf80300529e
--- /dev/null
+++ b/contrib/tcp_wrappers/refuse.c
@@ -0,0 +1,32 @@
+ /*
+ * refuse() reports a refused connection, and takes the consequences: in
+ * case of a datagram-oriented service, the unread datagram is taken from
+ * the input queue (or inetd would see the same datagram again and again);
+ * the program is terminated.
+ *
+ * Author: Wietse Venema, Eindhoven University of Technology, The Netherlands.
+ */
+
+#ifndef lint
+static char sccsid[] = "@(#) refuse.c 1.5 94/12/28 17:42:39";
+#endif
+
+/* System libraries. */
+
+#include <stdio.h>
+#include <syslog.h>
+
+/* Local stuff. */
+
+#include "tcpd.h"
+
+/* refuse - refuse request */
+
+void refuse(request)
+struct request_info *request;
+{
+ syslog(deny_severity, "refused connect from %s", eval_client(request));
+ clean_exit(request);
+ /* NOTREACHED */
+}
+
diff --git a/contrib/tcp_wrappers/rfc931.c b/contrib/tcp_wrappers/rfc931.c
new file mode 100644
index 000000000000..8176417b8fd6
--- /dev/null
+++ b/contrib/tcp_wrappers/rfc931.c
@@ -0,0 +1,165 @@
+ /*
+ * rfc931() speaks a common subset of the RFC 931, AUTH, TAP, IDENT and RFC
+ * 1413 protocols. It queries an RFC 931 etc. compatible daemon on a remote
+ * host to look up the owner of a connection. The information should not be
+ * used for authentication purposes. This routine intercepts alarm signals.
+ *
+ * Diagnostics are reported through syslog(3).
+ *
+ * Author: Wietse Venema, Eindhoven University of Technology, The Netherlands.
+ */
+
+#ifndef lint
+static char sccsid[] = "@(#) rfc931.c 1.10 95/01/02 16:11:34";
+#endif
+
+/* System libraries. */
+
+#include <stdio.h>
+#include <syslog.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <setjmp.h>
+#include <signal.h>
+#include <string.h>
+
+/* Local stuff. */
+
+#include "tcpd.h"
+
+#define RFC931_PORT 113 /* Semi-well-known port */
+#define ANY_PORT 0 /* Any old port will do */
+
+int rfc931_timeout = RFC931_TIMEOUT;/* Global so it can be changed */
+
+static jmp_buf timebuf;
+
+/* fsocket - open stdio stream on top of socket */
+
+static FILE *fsocket(domain, type, protocol)
+int domain;
+int type;
+int protocol;
+{
+ int s;
+ FILE *fp;
+
+ if ((s = socket(domain, type, protocol)) < 0) {
+ tcpd_warn("socket: %m");
+ return (0);
+ } else {
+ if ((fp = fdopen(s, "r+")) == 0) {
+ tcpd_warn("fdopen: %m");
+ close(s);
+ }
+ return (fp);
+ }
+}
+
+/* timeout - handle timeouts */
+
+static void timeout(sig)
+int sig;
+{
+ longjmp(timebuf, sig);
+}
+
+/* rfc931 - return remote user name, given socket structures */
+
+void rfc931(rmt_sin, our_sin, dest)
+struct sockaddr_in *rmt_sin;
+struct sockaddr_in *our_sin;
+char *dest;
+{
+ unsigned rmt_port;
+ unsigned our_port;
+ struct sockaddr_in rmt_query_sin;
+ struct sockaddr_in our_query_sin;
+ char user[256]; /* XXX */
+ char buffer[512]; /* XXX */
+ char *cp;
+ char *result = unknown;
+ FILE *fp;
+
+ /*
+ * Use one unbuffered stdio stream for writing to and for reading from
+ * the RFC931 etc. server. This is done because of a bug in the SunOS
+ * 4.1.x stdio library. The bug may live in other stdio implementations,
+ * too. When we use a single, buffered, bidirectional stdio stream ("r+"
+ * or "w+" mode) we read our own output. Such behaviour would make sense
+ * with resources that support random-access operations, but not with
+ * sockets.
+ */
+
+ if ((fp = fsocket(AF_INET, SOCK_STREAM, 0)) != 0) {
+ setbuf(fp, (char *) 0);
+
+ /*
+ * Set up a timer so we won't get stuck while waiting for the server.
+ */
+
+ if (setjmp(timebuf) == 0) {
+ signal(SIGALRM, timeout);
+ alarm(rfc931_timeout);
+
+ /*
+ * Bind the local and remote ends of the query socket to the same
+ * IP addresses as the connection under investigation. We go
+ * through all this trouble because the local or remote system
+ * might have more than one network address. The RFC931 etc.
+ * client sends only port numbers; the server takes the IP
+ * addresses from the query socket.
+ */
+
+ our_query_sin = *our_sin;
+ our_query_sin.sin_port = htons(ANY_PORT);
+ rmt_query_sin = *rmt_sin;
+ rmt_query_sin.sin_port = htons(RFC931_PORT);
+
+ if (bind(fileno(fp), (struct sockaddr *) & our_query_sin,
+ sizeof(our_query_sin)) >= 0 &&
+ connect(fileno(fp), (struct sockaddr *) & rmt_query_sin,
+ sizeof(rmt_query_sin)) >= 0) {
+
+ /*
+ * Send query to server. Neglect the risk that a 13-byte
+ * write would have to be fragmented by the local system and
+ * cause trouble with buggy System V stdio libraries.
+ */
+
+ fprintf(fp, "%u,%u\r\n",
+ ntohs(rmt_sin->sin_port),
+ ntohs(our_sin->sin_port));
+ fflush(fp);
+
+ /*
+ * Read response from server. Use fgets()/sscanf() so we can
+ * work around System V stdio libraries that incorrectly
+ * assume EOF when a read from a socket returns less than
+ * requested.
+ */
+
+ if (fgets(buffer, sizeof(buffer), fp) != 0
+ && ferror(fp) == 0 && feof(fp) == 0
+ && sscanf(buffer, "%u , %u : USERID :%*[^:]:%255s",
+ &rmt_port, &our_port, user) == 3
+ && ntohs(rmt_sin->sin_port) == rmt_port
+ && ntohs(our_sin->sin_port) == our_port) {
+
+ /*
+ * Strip trailing carriage return. It is part of the
+ * protocol, not part of the data.
+ */
+
+ if (cp = strchr(user, '\r'))
+ *cp = 0;
+ result = user;
+ }
+ }
+ alarm(0);
+ }
+ fclose(fp);
+ }
+ STRN_CPY(dest, result, STRING_LENGTH);
+}
diff --git a/contrib/tcp_wrappers/safe_finger.c b/contrib/tcp_wrappers/safe_finger.c
new file mode 100644
index 000000000000..7b8f3cd638a8
--- /dev/null
+++ b/contrib/tcp_wrappers/safe_finger.c
@@ -0,0 +1,196 @@
+ /*
+ * safe_finger - finger client wrapper that protects against nasty stuff
+ * from finger servers. Use this program for automatic reverse finger
+ * probes, not the raw finger command.
+ *
+ * Build with: cc -o safe_finger safe_finger.c
+ *
+ * The problem: some programs may react to stuff in the first column. Other
+ * programs may get upset by thrash anywhere on a line. File systems may
+ * fill up as the finger server keeps sending data. Text editors may bomb
+ * out on extremely long lines. The finger server may take forever because
+ * it is somehow wedged. The code below takes care of all this badness.
+ *
+ * Author: Wietse Venema, Eindhoven University of Technology, The Netherlands.
+ */
+
+#ifndef lint
+static char sccsid[] = "@(#) safe_finger.c 1.4 94/12/28 17:42:41";
+#endif
+
+/* System libraries */
+
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <signal.h>
+#include <stdio.h>
+#include <ctype.h>
+#include <pwd.h>
+
+extern void exit();
+
+/* Local stuff */
+
+char path[] = "PATH=/bin:/usr/bin:/usr/ucb:/usr/bsd:/etc:/usr/etc:/usr/sbin";
+
+#define TIME_LIMIT 60 /* Do not keep listinging forever */
+#define INPUT_LENGTH 100000 /* Do not keep listinging forever */
+#define LINE_LENGTH 128 /* Editors can choke on long lines */
+#define FINGER_PROGRAM "finger" /* Most, if not all, UNIX systems */
+#define UNPRIV_NAME "nobody" /* Preferred privilege level */
+#define UNPRIV_UGID 32767 /* Default uid and gid */
+
+int finger_pid;
+
+void cleanup(sig)
+int sig;
+{
+ kill(finger_pid, SIGKILL);
+ exit(0);
+}
+
+main(argc, argv)
+int argc;
+char **argv;
+{
+ int c;
+ int line_length = 0;
+ int finger_status;
+ int wait_pid;
+ int input_count = 0;
+ struct passwd *pwd;
+
+ /*
+ * First of all, let's don't run with superuser privileges.
+ */
+ if (getuid() == 0 || geteuid() == 0) {
+ if ((pwd = getpwnam(UNPRIV_NAME)) && pwd->pw_uid > 0) {
+ setgid(pwd->pw_gid);
+ setuid(pwd->pw_uid);
+ } else {
+ setgid(UNPRIV_UGID);
+ setuid(UNPRIV_UGID);
+ }
+ }
+
+ /*
+ * Redirect our standard input through the raw finger command.
+ */
+ if (putenv(path)) {
+ fprintf(stderr, "%s: putenv: out of memory", argv[0]);
+ exit(1);
+ }
+ argv[0] = FINGER_PROGRAM;
+ finger_pid = pipe_stdin(argv);
+
+ /*
+ * Don't wait forever (Peter Wemm <peter@gecko.DIALix.oz.au>).
+ */
+ signal(SIGALRM, cleanup);
+ (void) alarm(TIME_LIMIT);
+
+ /*
+ * Main filter loop.
+ */
+ while ((c = getchar()) != EOF) {
+ if (input_count++ >= INPUT_LENGTH) { /* don't listen forever */
+ fclose(stdin);
+ printf("\n\n Input truncated to %d bytes...\n", input_count - 1);
+ break;
+ }
+ if (c == '\n') { /* good: end of line */
+ putchar(c);
+ line_length = 0;
+ } else {
+ if (line_length >= LINE_LENGTH) { /* force end of line */
+ printf("\\\n");
+ line_length = 0;
+ }
+ if (line_length == 0) { /* protect left margin */
+ putchar(' ');
+ line_length++;
+ }
+ if (isascii(c) && (isprint(c) || isspace(c))) { /* text */
+ if (c == '\\') {
+ putchar(c);
+ line_length++;
+ }
+ putchar(c);
+ line_length++;
+ } else { /* quote all other thash */
+ printf("\\%03o", c & 0377);
+ line_length += 4;
+ }
+ }
+ }
+
+ /*
+ * Wait until the finger child process has terminated and account for its
+ * exit status. Which will always be zero on most systems.
+ */
+ while ((wait_pid = wait(&finger_status)) != -1 && wait_pid != finger_pid)
+ /* void */ ;
+ return (wait_pid != finger_pid || finger_status != 0);
+}
+
+/* perror_exit - report system error text and terminate */
+
+void perror_exit(text)
+char *text;
+{
+ perror(text);
+ exit(1);
+}
+
+/* pipe_stdin - pipe stdin through program (from my ANSI to OLD C converter) */
+
+int pipe_stdin(argv)
+char **argv;
+{
+ int pipefds[2];
+ int pid;
+ int i;
+ struct stat st;
+
+ /*
+ * The code that sets up the pipe requires that file descriptors 0,1,2
+ * are already open. All kinds of mysterious things will happen if that
+ * is not the case. The following loops makes sure that descriptors 0,1,2
+ * are set up properly.
+ */
+
+ for (i = 0; i < 3; i++) {
+ if (fstat(i, &st) == -1 && open("/dev/null", 2) != i)
+ perror_exit("open /dev/null");
+ }
+
+ /*
+ * Set up the pipe that interposes the command into our standard input
+ * stream.
+ */
+
+ if (pipe(pipefds))
+ perror_exit("pipe");
+
+ switch (pid = fork()) {
+ case -1: /* error */
+ perror_exit("fork");
+ /* NOTREACHED */
+ case 0: /* child */
+ (void) close(pipefds[0]); /* close reading end */
+ (void) close(1); /* connect stdout to pipe */
+ if (dup(pipefds[1]) != 1)
+ perror_exit("dup");
+ (void) close(pipefds[1]); /* close redundant fd */
+ (void) execvp(argv[0], argv);
+ perror_exit(argv[0]);
+ /* NOTREACHED */
+ default: /* parent */
+ (void) close(pipefds[1]); /* close writing end */
+ (void) close(0); /* connect stdin to pipe */
+ if (dup(pipefds[0]) != 0)
+ perror_exit("dup");
+ (void) close(pipefds[0]); /* close redundant fd */
+ return (pid);
+ }
+}
diff --git a/contrib/tcp_wrappers/scaffold.c b/contrib/tcp_wrappers/scaffold.c
new file mode 100644
index 000000000000..afce15a64e4d
--- /dev/null
+++ b/contrib/tcp_wrappers/scaffold.c
@@ -0,0 +1,213 @@
+ /*
+ * Routines for testing only. Not really industrial strength.
+ *
+ * Author: Wietse Venema, Eindhoven University of Technology, The Netherlands.
+ */
+
+#ifndef lint
+static char sccs_id[] = "@(#) scaffold.c 1.6 97/03/21 19:27:24";
+#endif
+
+/* System libraries. */
+
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <arpa/inet.h>
+#include <netdb.h>
+#include <stdio.h>
+#include <syslog.h>
+#include <setjmp.h>
+#include <string.h>
+
+#ifndef INADDR_NONE
+#define INADDR_NONE (-1) /* XXX should be 0xffffffff */
+#endif
+
+extern char *malloc();
+
+/* Application-specific. */
+
+#include "tcpd.h"
+#include "scaffold.h"
+
+ /*
+ * These are referenced by the options module and by rfc931.c.
+ */
+int allow_severity = SEVERITY;
+int deny_severity = LOG_WARNING;
+int rfc931_timeout = RFC931_TIMEOUT;
+
+/* dup_hostent - create hostent in one memory block */
+
+static struct hostent *dup_hostent(hp)
+struct hostent *hp;
+{
+ struct hostent_block {
+ struct hostent host;
+ char *addr_list[1];
+ };
+ struct hostent_block *hb;
+ int count;
+ char *data;
+ char *addr;
+
+ for (count = 0; hp->h_addr_list[count] != 0; count++)
+ /* void */ ;
+
+ if ((hb = (struct hostent_block *) malloc(sizeof(struct hostent_block)
+ + (hp->h_length + sizeof(char *)) * count)) == 0) {
+ fprintf(stderr, "Sorry, out of memory\n");
+ exit(1);
+ }
+ memset((char *) &hb->host, 0, sizeof(hb->host));
+ hb->host.h_length = hp->h_length;
+ hb->host.h_addr_list = hb->addr_list;
+ hb->host.h_addr_list[count] = 0;
+ data = (char *) (hb->host.h_addr_list + count + 1);
+
+ for (count = 0; (addr = hp->h_addr_list[count]) != 0; count++) {
+ hb->host.h_addr_list[count] = data + hp->h_length * count;
+ memcpy(hb->host.h_addr_list[count], addr, hp->h_length);
+ }
+ return (&hb->host);
+}
+
+/* find_inet_addr - find all addresses for this host, result to free() */
+
+struct hostent *find_inet_addr(host)
+char *host;
+{
+ struct in_addr addr;
+ struct hostent *hp;
+ static struct hostent h;
+ static char *addr_list[2];
+
+ /*
+ * Host address: translate it to internal form.
+ */
+ if ((addr.s_addr = dot_quad_addr(host)) != INADDR_NONE) {
+ h.h_addr_list = addr_list;
+ h.h_addr_list[0] = (char *) &addr;
+ h.h_length = sizeof(addr);
+ return (dup_hostent(&h));
+ }
+
+ /*
+ * Map host name to a series of addresses. Watch out for non-internet
+ * forms or aliases. The NOT_INADDR() is here in case gethostbyname() has
+ * been "enhanced" to accept numeric addresses. Make a copy of the
+ * address list so that later gethostbyXXX() calls will not clobber it.
+ */
+ if (NOT_INADDR(host) == 0) {
+ tcpd_warn("%s: not an internet address", host);
+ return (0);
+ }
+ if ((hp = gethostbyname(host)) == 0) {
+ tcpd_warn("%s: host not found", host);
+ return (0);
+ }
+ if (hp->h_addrtype != AF_INET) {
+ tcpd_warn("%d: not an internet host", hp->h_addrtype);
+ return (0);
+ }
+ if (STR_NE(host, hp->h_name)) {
+ tcpd_warn("%s: hostname alias", host);
+ tcpd_warn("(official name: %.*s)", STRING_LENGTH, hp->h_name);
+ }
+ return (dup_hostent(hp));
+}
+
+/* check_dns - give each address thorough workout, return address count */
+
+int check_dns(host)
+char *host;
+{
+ struct request_info request;
+ struct sockaddr_in sin;
+ struct hostent *hp;
+ int count;
+ char *addr;
+
+ if ((hp = find_inet_addr(host)) == 0)
+ return (0);
+ request_init(&request, RQ_CLIENT_SIN, &sin, 0);
+ sock_methods(&request);
+ memset((char *) &sin, 0, sizeof(sin));
+ sin.sin_family = AF_INET;
+
+ for (count = 0; (addr = hp->h_addr_list[count]) != 0; count++) {
+ memcpy((char *) &sin.sin_addr, addr, sizeof(sin.sin_addr));
+
+ /*
+ * Force host name and address conversions. Use the request structure
+ * as a cache. Detect hostname lookup problems. Any name/name or
+ * name/address conflicts will be reported while eval_hostname() does
+ * its job.
+ */
+ request_set(&request, RQ_CLIENT_ADDR, "", RQ_CLIENT_NAME, "", 0);
+ if (STR_EQ(eval_hostname(request.client), unknown))
+ tcpd_warn("host address %s->name lookup failed",
+ eval_hostaddr(request.client));
+ }
+ free((char *) hp);
+ return (count);
+}
+
+/* dummy function to intercept the real shell_cmd() */
+
+/* ARGSUSED */
+
+void shell_cmd(command)
+char *command;
+{
+ if (hosts_access_verbose)
+ printf("command: %s", command);
+}
+
+/* dummy function to intercept the real clean_exit() */
+
+/* ARGSUSED */
+
+void clean_exit(request)
+struct request_info *request;
+{
+ exit(0);
+}
+
+/* dummy function to intercept the real rfc931() */
+
+/* ARGSUSED */
+
+void rfc931(request)
+struct request_info *request;
+{
+ strcpy(request->user, unknown);
+}
+
+/* check_path - examine accessibility */
+
+int check_path(path, st)
+char *path;
+struct stat *st;
+{
+ struct stat stbuf;
+ char buf[BUFSIZ];
+
+ if (stat(path, st) < 0)
+ return (-1);
+#ifdef notdef
+ if (st->st_uid != 0)
+ tcpd_warn("%s: not owned by root", path);
+ if (st->st_mode & 020)
+ tcpd_warn("%s: group writable", path);
+#endif
+ if (st->st_mode & 002)
+ tcpd_warn("%s: world writable", path);
+ if (path[0] == '/' && path[1] != 0) {
+ strrchr(strcpy(buf, path), '/')[0] = 0;
+ (void) check_path(buf[0] ? buf : "/", &stbuf);
+ }
+ return (0);
+}
diff --git a/contrib/tcp_wrappers/scaffold.h b/contrib/tcp_wrappers/scaffold.h
new file mode 100644
index 000000000000..2273f4730b3f
--- /dev/null
+++ b/contrib/tcp_wrappers/scaffold.h
@@ -0,0 +1,9 @@
+ /*
+ * @(#) scaffold.h 1.3 94/12/31 18:19:19
+ *
+ * Author: Wietse Venema, Eindhoven University of Technology, The Netherlands.
+ */
+
+extern struct hostent *find_inet_addr();
+extern int check_dns();
+extern int check_path();
diff --git a/contrib/tcp_wrappers/setenv.c b/contrib/tcp_wrappers/setenv.c
new file mode 100644
index 000000000000..03c706280c64
--- /dev/null
+++ b/contrib/tcp_wrappers/setenv.c
@@ -0,0 +1,34 @@
+ /*
+ * Some systems do not have setenv(). This one is modeled after 4.4 BSD, but
+ * is implemented in terms of portable primitives only: getenv(), putenv()
+ * and malloc(). It should therefore be safe to use on every UNIX system.
+ *
+ * If clobber == 0, do not overwrite an existing variable.
+ *
+ * Returns nonzero if memory allocation fails.
+ *
+ * Author: Wietse Venema, Eindhoven University of Technology, The Netherlands.
+ */
+
+#ifndef lint
+static char sccsid[] = "@(#) setenv.c 1.1 93/03/07 22:47:58";
+#endif
+
+/* setenv - update or insert environment (name,value) pair */
+
+int setenv(name, value, clobber)
+char *name;
+char *value;
+int clobber;
+{
+ char *malloc();
+ char *getenv();
+ char *cp;
+
+ if (clobber == 0 && getenv(name) != 0)
+ return (0);
+ if ((cp = malloc(strlen(name) + strlen(value) + 2)) == 0)
+ return (1);
+ sprintf(cp, "%s=%s", name, value);
+ return (putenv(cp));
+}
diff --git a/contrib/tcp_wrappers/shell_cmd.c b/contrib/tcp_wrappers/shell_cmd.c
new file mode 100644
index 000000000000..62d31bc5240d
--- /dev/null
+++ b/contrib/tcp_wrappers/shell_cmd.c
@@ -0,0 +1,92 @@
+ /*
+ * shell_cmd() takes a shell command after %<character> substitutions. The
+ * command is executed by a /bin/sh child process, with standard input,
+ * standard output and standard error connected to /dev/null.
+ *
+ * Diagnostics are reported through syslog(3).
+ *
+ * Author: Wietse Venema, Eindhoven University of Technology, The Netherlands.
+ */
+
+#ifndef lint
+static char sccsid[] = "@(#) shell_cmd.c 1.5 94/12/28 17:42:44";
+#endif
+
+/* System libraries. */
+
+#include <sys/types.h>
+#include <sys/param.h>
+#include <signal.h>
+#include <stdio.h>
+#include <syslog.h>
+#include <string.h>
+
+extern void exit();
+
+/* Local stuff. */
+
+#include "tcpd.h"
+
+/* Forward declarations. */
+
+static void do_child();
+
+/* shell_cmd - execute shell command */
+
+void shell_cmd(command)
+char *command;
+{
+ int child_pid;
+ int wait_pid;
+
+ /*
+ * Most of the work is done within the child process, to minimize the
+ * risk of damage to the parent.
+ */
+
+ switch (child_pid = fork()) {
+ case -1: /* error */
+ tcpd_warn("cannot fork: %m");
+ break;
+ case 00: /* child */
+ do_child(command);
+ /* NOTREACHED */
+ default: /* parent */
+ while ((wait_pid = wait((int *) 0)) != -1 && wait_pid != child_pid)
+ /* void */ ;
+ }
+}
+
+/* do_child - exec command with { stdin, stdout, stderr } to /dev/null */
+
+static void do_child(command)
+char *command;
+{
+ char *error;
+ int tmp_fd;
+
+ /*
+ * Systems with POSIX sessions may send a SIGHUP to grandchildren if the
+ * child exits first. This is sick, sessions were invented for terminals.
+ */
+
+ signal(SIGHUP, SIG_IGN);
+
+ /* Set up new stdin, stdout, stderr, and exec the shell command. */
+
+ for (tmp_fd = 0; tmp_fd < 3; tmp_fd++)
+ (void) close(tmp_fd);
+ if (open("/dev/null", 2) != 0) {
+ error = "open /dev/null: %m";
+ } else if (dup(0) != 1 || dup(0) != 2) {
+ error = "dup: %m";
+ } else {
+ (void) execl("/bin/sh", "sh", "-c", command, (char *) 0);
+ error = "execl /bin/sh: %m";
+ }
+
+ /* Something went wrong. We MUST terminate the child process. */
+
+ tcpd_warn(error);
+ _exit(0);
+}
diff --git a/contrib/tcp_wrappers/socket.c b/contrib/tcp_wrappers/socket.c
new file mode 100644
index 000000000000..c659b166698f
--- /dev/null
+++ b/contrib/tcp_wrappers/socket.c
@@ -0,0 +1,235 @@
+ /*
+ * This module determines the type of socket (datagram, stream), the client
+ * socket address and port, the server socket address and port. In addition,
+ * it provides methods to map a transport address to a printable host name
+ * or address. Socket address information results are in static memory.
+ *
+ * The result from the hostname lookup method is STRING_PARANOID when a host
+ * pretends to have someone elses name, or when a host name is available but
+ * could not be verified.
+ *
+ * When lookup or conversion fails the result is set to STRING_UNKNOWN.
+ *
+ * Diagnostics are reported through syslog(3).
+ *
+ * Author: Wietse Venema, Eindhoven University of Technology, The Netherlands.
+ */
+
+#ifndef lint
+static char sccsid[] = "@(#) socket.c 1.15 97/03/21 19:27:24";
+#endif
+
+/* System libraries. */
+
+#include <sys/types.h>
+#include <sys/param.h>
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <netdb.h>
+#include <stdio.h>
+#include <syslog.h>
+#include <string.h>
+
+extern char *inet_ntoa();
+
+/* Local stuff. */
+
+#include "tcpd.h"
+
+/* Forward declarations. */
+
+static void sock_sink();
+
+#ifdef APPEND_DOT
+
+ /*
+ * Speed up DNS lookups by terminating the host name with a dot. Should be
+ * done with care. The speedup can give problems with lookups from sources
+ * that lack DNS-style trailing dot magic, such as local files or NIS maps.
+ */
+
+static struct hostent *gethostbyname_dot(name)
+char *name;
+{
+ char dot_name[MAXHOSTNAMELEN + 1];
+
+ /*
+ * Don't append dots to unqualified names. Such names are likely to come
+ * from local hosts files or from NIS.
+ */
+
+ if (strchr(name, '.') == 0 || strlen(name) >= MAXHOSTNAMELEN - 1) {
+ return (gethostbyname(name));
+ } else {
+ sprintf(dot_name, "%s.", name);
+ return (gethostbyname(dot_name));
+ }
+}
+
+#define gethostbyname gethostbyname_dot
+#endif
+
+/* sock_host - look up endpoint addresses and install conversion methods */
+
+void sock_host(request)
+struct request_info *request;
+{
+ static struct sockaddr_in client;
+ static struct sockaddr_in server;
+ int len;
+ char buf[BUFSIZ];
+ int fd = request->fd;
+
+ sock_methods(request);
+
+ /*
+ * Look up the client host address. Hal R. Brand <BRAND@addvax.llnl.gov>
+ * suggested how to get the client host info in case of UDP connections:
+ * peek at the first message without actually looking at its contents. We
+ * really should verify that client.sin_family gets the value AF_INET,
+ * but this program has already caused too much grief on systems with
+ * broken library code.
+ */
+
+ len = sizeof(client);
+ if (getpeername(fd, (struct sockaddr *) & client, &len) < 0) {
+ request->sink = sock_sink;
+ len = sizeof(client);
+ if (recvfrom(fd, buf, sizeof(buf), MSG_PEEK,
+ (struct sockaddr *) & client, &len) < 0) {
+ tcpd_warn("can't get client address: %m");
+ return; /* give up */
+ }
+#ifdef really_paranoid
+ memset(buf, 0 sizeof(buf));
+#endif
+ }
+ request->client->sin = &client;
+
+ /*
+ * Determine the server binding. This is used for client username
+ * lookups, and for access control rules that trigger on the server
+ * address or name.
+ */
+
+ len = sizeof(server);
+ if (getsockname(fd, (struct sockaddr *) & server, &len) < 0) {
+ tcpd_warn("getsockname: %m");
+ return;
+ }
+ request->server->sin = &server;
+}
+
+/* sock_hostaddr - map endpoint address to printable form */
+
+void sock_hostaddr(host)
+struct host_info *host;
+{
+ struct sockaddr_in *sin = host->sin;
+
+ if (sin != 0)
+ STRN_CPY(host->addr, inet_ntoa(sin->sin_addr), sizeof(host->addr));
+}
+
+/* sock_hostname - map endpoint address to host name */
+
+void sock_hostname(host)
+struct host_info *host;
+{
+ struct sockaddr_in *sin = host->sin;
+ struct hostent *hp;
+ int i;
+
+ /*
+ * On some systems, for example Solaris 2.3, gethostbyaddr(0.0.0.0) does
+ * not fail. Instead it returns "INADDR_ANY". Unfortunately, this does
+ * not work the other way around: gethostbyname("INADDR_ANY") fails. We
+ * have to special-case 0.0.0.0, in order to avoid false alerts from the
+ * host name/address checking code below.
+ */
+ if (sin != 0 && sin->sin_addr.s_addr != 0
+ && (hp = gethostbyaddr((char *) &(sin->sin_addr),
+ sizeof(sin->sin_addr), AF_INET)) != 0) {
+
+ STRN_CPY(host->name, hp->h_name, sizeof(host->name));
+
+ /*
+ * Verify that the address is a member of the address list returned
+ * by gethostbyname(hostname).
+ *
+ * Verify also that gethostbyaddr() and gethostbyname() return the same
+ * hostname, or rshd and rlogind may still end up being spoofed.
+ *
+ * On some sites, gethostbyname("localhost") returns "localhost.domain".
+ * This is a DNS artefact. We treat it as a special case. When we
+ * can't believe the address list from gethostbyname("localhost")
+ * we're in big trouble anyway.
+ */
+
+ if ((hp = gethostbyname(host->name)) == 0) {
+
+ /*
+ * Unable to verify that the host name matches the address. This
+ * may be a transient problem or a botched name server setup.
+ */
+
+ tcpd_warn("can't verify hostname: gethostbyname(%s) failed",
+ host->name);
+
+ } else if (STR_NE(host->name, hp->h_name)
+ && STR_NE(host->name, "localhost")) {
+
+ /*
+ * The gethostbyaddr() and gethostbyname() calls did not return
+ * the same hostname. This could be a nameserver configuration
+ * problem. It could also be that someone is trying to spoof us.
+ */
+
+ tcpd_warn("host name/name mismatch: %s != %.*s",
+ host->name, STRING_LENGTH, hp->h_name);
+
+ } else {
+
+ /*
+ * The address should be a member of the address list returned by
+ * gethostbyname(). We should first verify that the h_addrtype
+ * field is AF_INET, but this program has already caused too much
+ * grief on systems with broken library code.
+ */
+
+ for (i = 0; hp->h_addr_list[i]; i++) {
+ if (memcmp(hp->h_addr_list[i],
+ (char *) &sin->sin_addr,
+ sizeof(sin->sin_addr)) == 0)
+ return; /* name is good, keep it */
+ }
+
+ /*
+ * The host name does not map to the initial address. Perhaps
+ * someone has messed up. Perhaps someone compromised a name
+ * server.
+ */
+
+ tcpd_warn("host name/address mismatch: %s != %.*s",
+ inet_ntoa(sin->sin_addr), STRING_LENGTH, hp->h_name);
+ }
+ strcpy(host->name, paranoid); /* name is bad, clobber it */
+ }
+}
+
+/* sock_sink - absorb unreceived IP datagram */
+
+static void sock_sink(fd)
+int fd;
+{
+ char buf[BUFSIZ];
+ struct sockaddr_in sin;
+ int size = sizeof(sin);
+
+ /*
+ * Eat up the not-yet received datagram. Some systems insist on a
+ * non-zero source address argument in the recvfrom() call below.
+ */
+
+ (void) recvfrom(fd, buf, sizeof(buf), 0, (struct sockaddr *) & sin, &size);
+}
diff --git a/contrib/tcp_wrappers/strcasecmp.c b/contrib/tcp_wrappers/strcasecmp.c
new file mode 100644
index 000000000000..a54e82816171
--- /dev/null
+++ b/contrib/tcp_wrappers/strcasecmp.c
@@ -0,0 +1,94 @@
+/*
+ * Copyright (c) 1987 Regents of the University of California.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms are permitted
+ * provided that the above copyright notice and this paragraph are
+ * duplicated in all such forms and that any documentation,
+ * advertising materials, and other materials related to such
+ * distribution and use acknowledge that the software was developed
+ * by the University of California, Berkeley. The name of the
+ * University may not be used to endorse or promote products derived
+ * from this software without specific prior written permission.
+ * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
+ * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
+ */
+
+#if defined(LIBC_SCCS) && !defined(lint)
+static char sccsid[] = "@(#)strcasecmp.c 5.6 (Berkeley) 6/27/88";
+#endif /* LIBC_SCCS and not lint */
+
+/* Some environments don't define u_char -- WZV */
+#if 0
+#include <sys/types.h>
+#else
+typedef unsigned char u_char;
+#endif
+
+/*
+ * This array is designed for mapping upper and lower case letter
+ * together for a case independent comparison. The mappings are
+ * based upon ascii character sequences.
+ */
+static u_char charmap[] = {
+ '\000', '\001', '\002', '\003', '\004', '\005', '\006', '\007',
+ '\010', '\011', '\012', '\013', '\014', '\015', '\016', '\017',
+ '\020', '\021', '\022', '\023', '\024', '\025', '\026', '\027',
+ '\030', '\031', '\032', '\033', '\034', '\035', '\036', '\037',
+ '\040', '\041', '\042', '\043', '\044', '\045', '\046', '\047',
+ '\050', '\051', '\052', '\053', '\054', '\055', '\056', '\057',
+ '\060', '\061', '\062', '\063', '\064', '\065', '\066', '\067',
+ '\070', '\071', '\072', '\073', '\074', '\075', '\076', '\077',
+ '\100', '\141', '\142', '\143', '\144', '\145', '\146', '\147',
+ '\150', '\151', '\152', '\153', '\154', '\155', '\156', '\157',
+ '\160', '\161', '\162', '\163', '\164', '\165', '\166', '\167',
+ '\170', '\171', '\172', '\133', '\134', '\135', '\136', '\137',
+ '\140', '\141', '\142', '\143', '\144', '\145', '\146', '\147',
+ '\150', '\151', '\152', '\153', '\154', '\155', '\156', '\157',
+ '\160', '\161', '\162', '\163', '\164', '\165', '\166', '\167',
+ '\170', '\171', '\172', '\173', '\174', '\175', '\176', '\177',
+ '\200', '\201', '\202', '\203', '\204', '\205', '\206', '\207',
+ '\210', '\211', '\212', '\213', '\214', '\215', '\216', '\217',
+ '\220', '\221', '\222', '\223', '\224', '\225', '\226', '\227',
+ '\230', '\231', '\232', '\233', '\234', '\235', '\236', '\237',
+ '\240', '\241', '\242', '\243', '\244', '\245', '\246', '\247',
+ '\250', '\251', '\252', '\253', '\254', '\255', '\256', '\257',
+ '\260', '\261', '\262', '\263', '\264', '\265', '\266', '\267',
+ '\270', '\271', '\272', '\273', '\274', '\275', '\276', '\277',
+ '\300', '\341', '\342', '\343', '\344', '\345', '\346', '\347',
+ '\350', '\351', '\352', '\353', '\354', '\355', '\356', '\357',
+ '\360', '\361', '\362', '\363', '\364', '\365', '\366', '\367',
+ '\370', '\371', '\372', '\333', '\334', '\335', '\336', '\337',
+ '\340', '\341', '\342', '\343', '\344', '\345', '\346', '\347',
+ '\350', '\351', '\352', '\353', '\354', '\355', '\356', '\357',
+ '\360', '\361', '\362', '\363', '\364', '\365', '\366', '\367',
+ '\370', '\371', '\372', '\373', '\374', '\375', '\376', '\377',
+};
+
+strcasecmp(s1, s2)
+ char *s1, *s2;
+{
+ register u_char *cm = charmap,
+ *us1 = (u_char *)s1,
+ *us2 = (u_char *)s2;
+
+ while (cm[*us1] == cm[*us2++])
+ if (*us1++ == '\0')
+ return(0);
+ return(cm[*us1] - cm[*--us2]);
+}
+
+strncasecmp(s1, s2, n)
+ char *s1, *s2;
+ register int n;
+{
+ register u_char *cm = charmap,
+ *us1 = (u_char *)s1,
+ *us2 = (u_char *)s2;
+
+ while (--n >= 0 && cm[*us1] == cm[*us2++])
+ if (*us1++ == '\0')
+ return(0);
+ return(n < 0 ? 0 : cm[*us1] - cm[*--us2]);
+}
diff --git a/contrib/tcp_wrappers/tcpd.8 b/contrib/tcp_wrappers/tcpd.8
new file mode 100644
index 000000000000..351390714be1
--- /dev/null
+++ b/contrib/tcp_wrappers/tcpd.8
@@ -0,0 +1,178 @@
+.TH TCPD 8
+.SH NAME
+tcpd \- access control facility for internet services
+.SH DESCRIPTION
+.PP
+The \fItcpd\fR program can be set up to monitor incoming requests for
+\fItelnet\fR, \fIfinger\fR, \fIftp\fR, \fIexec\fR, \fIrsh\fR,
+\fIrlogin\fR, \fItftp\fR, \fItalk\fR, \fIcomsat\fR and other services
+that have a one-to-one mapping onto executable files.
+.PP
+The program supports both 4.3BSD-style sockets and System V.4-style
+TLI. Functionality may be limited when the protocol underneath TLI is
+not an internet protocol.
+.PP
+Operation is as follows: whenever a request for service arrives, the
+\fIinetd\fP daemon is tricked into running the \fItcpd\fP program
+instead of the desired server. \fItcpd\fP logs the request and does
+some additional checks. When all is well, \fItcpd\fP runs the
+appropriate server program and goes away.
+.PP
+Optional features are: pattern-based access control, client username
+lookups with the RFC 931 etc. protocol, protection against hosts that
+pretend to have someone elses host name, and protection against hosts
+that pretend to have someone elses network address.
+.SH LOGGING
+Connections that are monitored by
+.I tcpd
+are reported through the \fIsyslog\fR(3) facility. Each record contains
+a time stamp, the client host name and the name of the requested
+service. The information can be useful to detect unwanted activities,
+especially when logfile information from several hosts is merged.
+.PP
+In order to find out where your logs are going, examine the syslog
+configuration file, usually /etc/syslog.conf.
+.SH ACCESS CONTROL
+Optionally,
+.I tcpd
+supports a simple form of access control that is based on pattern
+matching. The access-control software provides hooks for the execution
+of shell commands when a pattern fires. For details, see the
+\fIhosts_access\fR(5) manual page.
+.SH HOST NAME VERIFICATION
+The authentication scheme of some protocols (\fIrlogin, rsh\fR) relies
+on host names. Some implementations believe the host name that they get
+from any random name server; other implementations are more careful but
+use a flawed algorithm.
+.PP
+.I tcpd
+verifies the client host name that is returned by the address->name DNS
+server by looking at the host name and address that are returned by the
+name->address DNS server. If any discrepancy is detected,
+.I tcpd
+concludes that it is dealing with a host that pretends to have someone
+elses host name.
+.PP
+If the sources are compiled with -DPARANOID,
+.I tcpd
+will drop the connection in case of a host name/address mismatch.
+Otherwise, the hostname can be matched with the \fIPARANOID\fR wildcard,
+after which suitable action can be taken.
+.SH HOST ADDRESS SPOOFING
+Optionally,
+.I tcpd
+disables source-routing socket options on every connection that it
+deals with. This will take care of most attacks from hosts that pretend
+to have an address that belongs to someone elses network. UDP services
+do not benefit from this protection. This feature must be turned on
+at compile time.
+.SH RFC 931
+When RFC 931 etc. lookups are enabled (compile-time option) \fItcpd\fR
+will attempt to establish the name of the client user. This will
+succeed only if the client host runs an RFC 931-compliant daemon.
+Client user name lookups will not work for datagram-oriented
+connections, and may cause noticeable delays in the case of connections
+from PCs.
+.SH EXAMPLES
+The details of using \fItcpd\fR depend on pathname information that was
+compiled into the program.
+.SH EXAMPLE 1
+This example applies when \fItcpd\fR expects that the original network
+daemons will be moved to an "other" place.
+.PP
+In order to monitor access to the \fIfinger\fR service, move the
+original finger daemon to the "other" place and install tcpd in the
+place of the original finger daemon. No changes are required to
+configuration files.
+.nf
+.sp
+.in +5
+# mkdir /other/place
+# mv /usr/etc/in.fingerd /other/place
+# cp tcpd /usr/etc/in.fingerd
+.fi
+.PP
+The example assumes that the network daemons live in /usr/etc. On some
+systems, network daemons live in /usr/sbin or in /usr/libexec, or have
+no `in.\' prefix to their name.
+.SH EXAMPLE 2
+This example applies when \fItcpd\fR expects that the network daemons
+are left in their original place.
+.PP
+In order to monitor access to the \fIfinger\fR service, perform the
+following edits on the \fIinetd\fR configuration file (usually
+\fI/etc/inetd.conf\fR or \fI/etc/inet/inetd.conf\fR):
+.nf
+.sp
+.ti +5
+finger stream tcp nowait nobody /usr/etc/in.fingerd in.fingerd
+.sp
+becomes:
+.sp
+.ti +5
+finger stream tcp nowait nobody /some/where/tcpd in.fingerd
+.sp
+.fi
+.PP
+The example assumes that the network daemons live in /usr/etc. On some
+systems, network daemons live in /usr/sbin or in /usr/libexec, the
+daemons have no `in.\' prefix to their name, or there is no userid
+field in the inetd configuration file.
+.PP
+Similar changes will be needed for the other services that are to be
+covered by \fItcpd\fR. Send a `kill -HUP\' to the \fIinetd\fR(8)
+process to make the changes effective. AIX users may also have to
+execute the `inetimp\' command.
+.SH EXAMPLE 3
+In the case of daemons that do not live in a common directory ("secret"
+or otherwise), edit the \fIinetd\fR configuration file so that it
+specifies an absolute path name for the process name field. For example:
+.nf
+.sp
+ ntalk dgram udp wait root /some/where/tcpd /usr/local/lib/ntalkd
+.sp
+.fi
+.PP
+Only the last component (ntalkd) of the pathname will be used for
+access control and logging.
+.SH BUGS
+Some UDP (and RPC) daemons linger around for a while after they have
+finished their work, in case another request comes in. In the inetd
+configuration file these services are registered with the \fIwait\fR
+option. Only the request that started such a daemon will be logged.
+.PP
+The program does not work with RPC services over TCP. These services
+are registered as \fIrpc/tcp\fR in the inetd configuration file. The
+only non-trivial service that is affected by this limitation is
+\fIrexd\fR, which is used by the \fIon(1)\fR command. This is no great
+loss. On most systems, \fIrexd\fR is less secure than a wildcard in
+/etc/hosts.equiv.
+.PP
+RPC broadcast requests (for example: \fIrwall, rup, rusers\fR) always
+appear to come from the responding host. What happens is that the
+client broadcasts the request to all \fIportmap\fR daemons on its
+network; each \fIportmap\fR daemon forwards the request to a local
+daemon. As far as the \fIrwall\fR etc. daemons know, the request comes
+from the local host.
+.SH FILES
+.PP
+The default locations of the host access control tables are:
+.PP
+/etc/hosts.allow
+.br
+/etc/hosts.deny
+.SH SEE ALSO
+.na
+.nf
+hosts_access(5), format of the tcpd access control tables.
+syslog.conf(5), format of the syslogd control file.
+inetd.conf(5), format of the inetd control file.
+.SH AUTHORS
+.na
+.nf
+Wietse Venema (wietse@wzv.win.tue.nl),
+Department of Mathematics and Computing Science,
+Eindhoven University of Technology
+Den Dolech 2, P.O. Box 513,
+5600 MB Eindhoven, The Netherlands
+\" @(#) tcpd.8 1.5 96/02/21 16:39:16
diff --git a/contrib/tcp_wrappers/tcpd.c b/contrib/tcp_wrappers/tcpd.c
new file mode 100644
index 000000000000..d865b9cce8eb
--- /dev/null
+++ b/contrib/tcp_wrappers/tcpd.c
@@ -0,0 +1,129 @@
+ /*
+ * General front end for stream and datagram IP services. This program logs
+ * the remote host name and then invokes the real daemon. For example,
+ * install as /usr/etc/{tftpd,fingerd,telnetd,ftpd,rlogind,rshd,rexecd},
+ * after saving the real daemons in the directory specified with the
+ * REAL_DAEMON_DIR macro. This arrangement requires that the network daemons
+ * are started by inetd or something similar. Connections and diagnostics
+ * are logged through syslog(3).
+ *
+ * Author: Wietse Venema, Eindhoven University of Technology, The Netherlands.
+ */
+
+#ifndef lint
+static char sccsid[] = "@(#) tcpd.c 1.10 96/02/11 17:01:32";
+#endif
+
+/* System libraries. */
+
+#include <sys/types.h>
+#include <sys/param.h>
+#include <sys/stat.h>
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <stdio.h>
+#include <syslog.h>
+#include <string.h>
+
+#ifndef MAXPATHNAMELEN
+#define MAXPATHNAMELEN BUFSIZ
+#endif
+
+#ifndef STDIN_FILENO
+#define STDIN_FILENO 0
+#endif
+
+/* Local stuff. */
+
+#include "patchlevel.h"
+#include "tcpd.h"
+
+int allow_severity = SEVERITY; /* run-time adjustable */
+int deny_severity = LOG_WARNING; /* ditto */
+
+main(argc, argv)
+int argc;
+char **argv;
+{
+ struct request_info request;
+ char path[MAXPATHNAMELEN];
+
+ /* Attempt to prevent the creation of world-writable files. */
+
+#ifdef DAEMON_UMASK
+ umask(DAEMON_UMASK);
+#endif
+
+ /*
+ * If argv[0] is an absolute path name, ignore REAL_DAEMON_DIR, and strip
+ * argv[0] to its basename.
+ */
+
+ if (argv[0][0] == '/') {
+ strcpy(path, argv[0]);
+ argv[0] = strrchr(argv[0], '/') + 1;
+ } else {
+ sprintf(path, "%s/%s", REAL_DAEMON_DIR, argv[0]);
+ }
+
+ /*
+ * Open a channel to the syslog daemon. Older versions of openlog()
+ * require only two arguments.
+ */
+
+#ifdef LOG_MAIL
+ (void) openlog(argv[0], LOG_PID, FACILITY);
+#else
+ (void) openlog(argv[0], LOG_PID);
+#endif
+
+ /*
+ * Find out the endpoint addresses of this conversation. Host name
+ * lookups and double checks will be done on demand.
+ */
+
+ request_init(&request, RQ_DAEMON, argv[0], RQ_FILE, STDIN_FILENO, 0);
+ fromhost(&request);
+
+ /*
+ * Optionally look up and double check the remote host name. Sites
+ * concerned with security may choose to refuse connections from hosts
+ * that pretend to have someone elses host name.
+ */
+
+#ifdef PARANOID
+ if (STR_EQ(eval_hostname(request.client), paranoid))
+ refuse(&request);
+#endif
+
+ /*
+ * The BSD rlogin and rsh daemons that came out after 4.3 BSD disallow
+ * socket options at the IP level. They do so for a good reason.
+ * Unfortunately, we cannot use this with SunOS 4.1.x because the
+ * getsockopt() system call can panic the system.
+ */
+
+#ifdef KILL_IP_OPTIONS
+ fix_options(&request);
+#endif
+
+ /*
+ * Check whether this host can access the service in argv[0]. The
+ * access-control code invokes optional shell commands as specified in
+ * the access-control tables.
+ */
+
+#ifdef HOSTS_ACCESS
+ if (!hosts_access(&request))
+ refuse(&request);
+#endif
+
+ /* Report request and invoke the real daemon program. */
+
+ syslog(allow_severity, "connect from %s", eval_client(&request));
+ closelog();
+ (void) execv(path, argv);
+ syslog(LOG_ERR, "error: cannot execute %s: %m", path);
+ clean_exit(&request);
+ /* NOTREACHED */
+}
diff --git a/contrib/tcp_wrappers/tcpd.h b/contrib/tcp_wrappers/tcpd.h
new file mode 100644
index 000000000000..3eecc9115997
--- /dev/null
+++ b/contrib/tcp_wrappers/tcpd.h
@@ -0,0 +1,219 @@
+ /*
+ * @(#) tcpd.h 1.5 96/03/19 16:22:24
+ *
+ * Author: Wietse Venema, Eindhoven University of Technology, The Netherlands.
+ */
+
+/* Structure to describe one communications endpoint. */
+
+#define STRING_LENGTH 128 /* hosts, users, processes */
+
+struct host_info {
+ char name[STRING_LENGTH]; /* access via eval_hostname(host) */
+ char addr[STRING_LENGTH]; /* access via eval_hostaddr(host) */
+ struct sockaddr_in *sin; /* socket address or 0 */
+ struct t_unitdata *unit; /* TLI transport address or 0 */
+ struct request_info *request; /* for shared information */
+};
+
+/* Structure to describe what we know about a service request. */
+
+struct request_info {
+ int fd; /* socket handle */
+ char user[STRING_LENGTH]; /* access via eval_user(request) */
+ char daemon[STRING_LENGTH]; /* access via eval_daemon(request) */
+ char pid[10]; /* access via eval_pid(request) */
+ struct host_info client[1]; /* client endpoint info */
+ struct host_info server[1]; /* server endpoint info */
+ void (*sink) (); /* datagram sink function or 0 */
+ void (*hostname) (); /* address to printable hostname */
+ void (*hostaddr) (); /* address to printable address */
+ void (*cleanup) (); /* cleanup function or 0 */
+ struct netconfig *config; /* netdir handle */
+};
+
+/* Common string operations. Less clutter should be more readable. */
+
+#define STRN_CPY(d,s,l) { strncpy((d),(s),(l)); (d)[(l)-1] = 0; }
+
+#define STRN_EQ(x,y,l) (strncasecmp((x),(y),(l)) == 0)
+#define STRN_NE(x,y,l) (strncasecmp((x),(y),(l)) != 0)
+#define STR_EQ(x,y) (strcasecmp((x),(y)) == 0)
+#define STR_NE(x,y) (strcasecmp((x),(y)) != 0)
+
+ /*
+ * Initially, all above strings have the empty value. Information that
+ * cannot be determined at runtime is set to "unknown", so that we can
+ * distinguish between `unavailable' and `not yet looked up'. A hostname
+ * that we do not believe in is set to "paranoid".
+ */
+
+#define STRING_UNKNOWN "unknown" /* lookup failed */
+#define STRING_PARANOID "paranoid" /* hostname conflict */
+
+extern char unknown[];
+extern char paranoid[];
+
+#define HOSTNAME_KNOWN(s) (STR_NE((s),unknown) && STR_NE((s),paranoid))
+
+#define NOT_INADDR(s) (s[strspn(s,"01234567890./")] != 0)
+
+/* Global functions. */
+
+#if defined(TLI) || defined(PTX) || defined(TLI_SEQUENT)
+extern void fromhost(); /* get/validate client host info */
+#else
+#define fromhost sock_host /* no TLI support needed */
+#endif
+
+extern int hosts_access(); /* access control */
+extern void shell_cmd(); /* execute shell command */
+extern char *percent_x(); /* do %<char> expansion */
+extern void rfc931(); /* client name from RFC 931 daemon */
+extern void clean_exit(); /* clean up and exit */
+extern void refuse(); /* clean up and exit */
+extern char *xgets(); /* fgets() on steroids */
+extern char *split_at(); /* strchr() and split */
+extern unsigned long dot_quad_addr(); /* restricted inet_addr() */
+
+/* Global variables. */
+
+extern int allow_severity; /* for connection logging */
+extern int deny_severity; /* for connection logging */
+extern char *hosts_allow_table; /* for verification mode redirection */
+extern char *hosts_deny_table; /* for verification mode redirection */
+extern int hosts_access_verbose; /* for verbose matching mode */
+extern int rfc931_timeout; /* user lookup timeout */
+extern int resident; /* > 0 if resident process */
+
+ /*
+ * Routines for controlled initialization and update of request structure
+ * attributes. Each attribute has its own key.
+ */
+
+#ifdef __STDC__
+extern struct request_info *request_init(struct request_info *,...);
+extern struct request_info *request_set(struct request_info *,...);
+#else
+extern struct request_info *request_init(); /* initialize request */
+extern struct request_info *request_set(); /* update request structure */
+#endif
+
+#define RQ_FILE 1 /* file descriptor */
+#define RQ_DAEMON 2 /* server process (argv[0]) */
+#define RQ_USER 3 /* client user name */
+#define RQ_CLIENT_NAME 4 /* client host name */
+#define RQ_CLIENT_ADDR 5 /* client host address */
+#define RQ_CLIENT_SIN 6 /* client endpoint (internal) */
+#define RQ_SERVER_NAME 7 /* server host name */
+#define RQ_SERVER_ADDR 8 /* server host address */
+#define RQ_SERVER_SIN 9 /* server endpoint (internal) */
+
+ /*
+ * Routines for delayed evaluation of request attributes. Each attribute
+ * type has its own access method. The trivial ones are implemented by
+ * macros. The other ones are wrappers around the transport-specific host
+ * name, address, and client user lookup methods. The request_info and
+ * host_info structures serve as caches for the lookup results.
+ */
+
+extern char *eval_user(); /* client user */
+extern char *eval_hostname(); /* printable hostname */
+extern char *eval_hostaddr(); /* printable host address */
+extern char *eval_hostinfo(); /* host name or address */
+extern char *eval_client(); /* whatever is available */
+extern char *eval_server(); /* whatever is available */
+#define eval_daemon(r) ((r)->daemon) /* daemon process name */
+#define eval_pid(r) ((r)->pid) /* process id */
+
+/* Socket-specific methods, including DNS hostname lookups. */
+
+extern void sock_host(); /* look up endpoint addresses */
+extern void sock_hostname(); /* translate address to hostname */
+extern void sock_hostaddr(); /* address to printable address */
+#define sock_methods(r) \
+ { (r)->hostname = sock_hostname; (r)->hostaddr = sock_hostaddr; }
+
+/* The System V Transport-Level Interface (TLI) interface. */
+
+#if defined(TLI) || defined(PTX) || defined(TLI_SEQUENT)
+extern void tli_host(); /* look up endpoint addresses etc. */
+#endif
+
+ /*
+ * Problem reporting interface. Additional file/line context is reported
+ * when available. The jump buffer (tcpd_buf) is not declared here, or
+ * everyone would have to include <setjmp.h>.
+ */
+
+#ifdef __STDC__
+extern void tcpd_warn(char *, ...); /* report problem and proceed */
+extern void tcpd_jump(char *, ...); /* report problem and jump */
+#else
+extern void tcpd_warn();
+extern void tcpd_jump();
+#endif
+
+struct tcpd_context {
+ char *file; /* current file */
+ int line; /* current line */
+};
+extern struct tcpd_context tcpd_context;
+
+ /*
+ * While processing access control rules, error conditions are handled by
+ * jumping back into the hosts_access() routine. This is cleaner than
+ * checking the return value of each and every silly little function. The
+ * (-1) returns are here because zero is already taken by longjmp().
+ */
+
+#define AC_PERMIT 1 /* permit access */
+#define AC_DENY (-1) /* deny_access */
+#define AC_ERROR AC_DENY /* XXX */
+
+ /*
+ * In verification mode an option function should just say what it would do,
+ * instead of really doing it. An option function that would not return
+ * should clear the dry_run flag to inform the caller of this unusual
+ * behavior.
+ */
+
+extern void process_options(); /* execute options */
+extern int dry_run; /* verification flag */
+
+/* Bug workarounds. */
+
+#ifdef INET_ADDR_BUG /* inet_addr() returns struct */
+#define inet_addr fix_inet_addr
+extern long fix_inet_addr();
+#endif
+
+#ifdef BROKEN_FGETS /* partial reads from sockets */
+#define fgets fix_fgets
+extern char *fix_fgets();
+#endif
+
+#ifdef RECVFROM_BUG /* no address family info */
+#define recvfrom fix_recvfrom
+extern int fix_recvfrom();
+#endif
+
+#ifdef GETPEERNAME_BUG /* claims success with UDP */
+#define getpeername fix_getpeername
+extern int fix_getpeername();
+#endif
+
+#ifdef SOLARIS_24_GETHOSTBYNAME_BUG /* lists addresses as aliases */
+#define gethostbyname fix_gethostbyname
+extern struct hostent *fix_gethostbyname();
+#endif
+
+#ifdef USE_STRSEP /* libc calls strtok() */
+#define strtok fix_strtok
+extern char *fix_strtok();
+#endif
+
+#ifdef LIBC_CALLS_STRTOK /* libc calls strtok() */
+#define strtok my_strtok
+extern char *my_strtok();
+#endif
diff --git a/contrib/tcp_wrappers/tcpdchk.8 b/contrib/tcp_wrappers/tcpdchk.8
new file mode 100644
index 000000000000..acc65e6441ad
--- /dev/null
+++ b/contrib/tcp_wrappers/tcpdchk.8
@@ -0,0 +1,66 @@
+.TH TCPDCHK 8
+.SH NAME
+tcpdchk \- tcp wrapper configuration checker
+.SH SYNOPSYS
+tcpdchk [-a] [-d] [-i inet_conf] [-v]
+.SH DESCRIPTION
+.PP
+\fItcpdchk\fR examines your tcp wrapper configuration and reports all
+potential and real problems it can find. The program examines the
+\fItcpd\fR access control files (by default, these are
+\fI/etc/hosts.allow\fR and \fI/etc/hosts.deny\fR), and compares the
+entries in these files against entries in the \fIinetd\fR or \fItlid\fR
+network configuration files.
+.PP
+\fItcpdchk\fR reports problems such as non-existent pathnames; services
+that appear in \fItcpd\fR access control rules, but are not controlled
+by \fItcpd\fR; services that should not be wrapped; non-existent host
+names or non-internet address forms; occurrences of host aliases
+instead of official host names; hosts with a name/address conflict;
+inappropriate use of wildcard patterns; inappropriate use of NIS
+netgroups or references to non-existent NIS netgroups; references to
+non-existent options; invalid arguments to options; and so on.
+.PP
+Where possible, \fItcpdchk\fR provides a helpful suggestion to fix the
+problem.
+.SH OPTIONS
+.IP -a
+Report access control rules that permit access without an explicit
+ALLOW keyword. This applies only when the extended access control
+language is enabled (build with -DPROCESS_OPTIONS).
+.IP -d
+Examine \fIhosts.allow\fR and \fIhosts.deny\fR files in the current
+directory instead of the default ones.
+.IP "-i inet_conf"
+Specify this option when \fItcpdchk\fR is unable to find your
+\fIinetd.conf\fR or \fItlid.conf\fR network configuration file, or when
+you suspect that the program uses the wrong one.
+.IP -v
+Display the contents of each access control rule. Daemon lists, client
+lists, shell commands and options are shown in a pretty-printed format;
+this makes it easier for you to spot any discrepancies between what you
+want and what the program understands.
+.SH FILES
+.PP
+The default locations of the \fItcpd\fR access control tables are:
+.PP
+/etc/hosts.allow
+.br
+/etc/hosts.deny
+.SH SEE ALSO
+.na
+.nf
+tcpdmatch(8), explain what tcpd would do in specific cases.
+hosts_access(5), format of the tcpd access control tables.
+hosts_options(5), format of the language extensions.
+inetd.conf(5), format of the inetd control file.
+tlid.conf(5), format of the tlid control file.
+.SH AUTHORS
+.na
+.nf
+Wietse Venema (wietse@wzv.win.tue.nl),
+Department of Mathematics and Computing Science,
+Eindhoven University of Technology
+Den Dolech 2, P.O. Box 513,
+5600 MB Eindhoven, The Netherlands
+\" @(#) tcpdchk.8 1.3 95/01/08 17:00:30
diff --git a/contrib/tcp_wrappers/tcpdchk.c b/contrib/tcp_wrappers/tcpdchk.c
new file mode 100644
index 000000000000..49c5c82c1b44
--- /dev/null
+++ b/contrib/tcp_wrappers/tcpdchk.c
@@ -0,0 +1,462 @@
+ /*
+ * tcpdchk - examine all tcpd access control rules and inetd.conf entries
+ *
+ * Usage: tcpdchk [-a] [-d] [-i inet_conf] [-v]
+ *
+ * -a: complain about implicit "allow" at end of rule.
+ *
+ * -d: rules in current directory.
+ *
+ * -i: location of inetd.conf file.
+ *
+ * -v: show all rules.
+ *
+ * Author: Wietse Venema, Eindhoven University of Technology, The Netherlands.
+ */
+
+#ifndef lint
+static char sccsid[] = "@(#) tcpdchk.c 1.8 97/02/12 02:13:25";
+#endif
+
+/* System libraries. */
+
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <netinet/in.h>
+#include <arpa/inet.h>
+#include <stdio.h>
+#include <syslog.h>
+#include <setjmp.h>
+#include <errno.h>
+#include <netdb.h>
+#include <string.h>
+
+extern int errno;
+extern void exit();
+extern int optind;
+extern char *optarg;
+
+#ifndef INADDR_NONE
+#define INADDR_NONE (-1) /* XXX should be 0xffffffff */
+#endif
+
+#ifndef S_ISDIR
+#define S_ISDIR(m) (((m) & S_IFMT) == S_IFDIR)
+#endif
+
+/* Application-specific. */
+
+#include "tcpd.h"
+#include "inetcf.h"
+#include "scaffold.h"
+
+ /*
+ * Stolen from hosts_access.c...
+ */
+static char sep[] = ", \t\n";
+
+#define BUFLEN 2048
+
+int resident = 0;
+int hosts_access_verbose = 0;
+char *hosts_allow_table = HOSTS_ALLOW;
+char *hosts_deny_table = HOSTS_DENY;
+extern jmp_buf tcpd_buf;
+
+ /*
+ * Local stuff.
+ */
+static void usage();
+static void parse_table();
+static void print_list();
+static void check_daemon_list();
+static void check_client_list();
+static void check_daemon();
+static void check_user();
+static int check_host();
+static int reserved_name();
+
+#define PERMIT 1
+#define DENY 0
+
+#define YES 1
+#define NO 0
+
+static int defl_verdict;
+static char *myname;
+static int allow_check;
+static char *inetcf;
+
+int main(argc, argv)
+int argc;
+char **argv;
+{
+ struct request_info request;
+ struct stat st;
+ int c;
+
+ myname = argv[0];
+
+ /*
+ * Parse the JCL.
+ */
+ while ((c = getopt(argc, argv, "adi:v")) != EOF) {
+ switch (c) {
+ case 'a':
+ allow_check = 1;
+ break;
+ case 'd':
+ hosts_allow_table = "hosts.allow";
+ hosts_deny_table = "hosts.deny";
+ break;
+ case 'i':
+ inetcf = optarg;
+ break;
+ case 'v':
+ hosts_access_verbose++;
+ break;
+ default:
+ usage();
+ /* NOTREACHED */
+ }
+ }
+ if (argc != optind)
+ usage();
+
+ /*
+ * When confusion really strikes...
+ */
+ if (check_path(REAL_DAEMON_DIR, &st) < 0) {
+ tcpd_warn("REAL_DAEMON_DIR %s: %m", REAL_DAEMON_DIR);
+ } else if (!S_ISDIR(st.st_mode)) {
+ tcpd_warn("REAL_DAEMON_DIR %s is not a directory", REAL_DAEMON_DIR);
+ }
+
+ /*
+ * Process the inet configuration file (or its moral equivalent). This
+ * information is used later to find references in hosts.allow/deny to
+ * unwrapped services, and other possible problems.
+ */
+ inetcf = inet_cfg(inetcf);
+ if (hosts_access_verbose)
+ printf("Using network configuration file: %s\n", inetcf);
+
+ /*
+ * These are not run from inetd but may have built-in access control.
+ */
+ inet_set("portmap", WR_NOT);
+ inet_set("rpcbind", WR_NOT);
+
+ /*
+ * Check accessibility of access control files.
+ */
+ (void) check_path(hosts_allow_table, &st);
+ (void) check_path(hosts_deny_table, &st);
+
+ /*
+ * Fake up an arbitrary service request.
+ */
+ request_init(&request,
+ RQ_DAEMON, "daemon_name",
+ RQ_SERVER_NAME, "server_hostname",
+ RQ_SERVER_ADDR, "server_addr",
+ RQ_USER, "user_name",
+ RQ_CLIENT_NAME, "client_hostname",
+ RQ_CLIENT_ADDR, "client_addr",
+ RQ_FILE, 1,
+ 0);
+
+ /*
+ * Examine all access-control rules.
+ */
+ defl_verdict = PERMIT;
+ parse_table(hosts_allow_table, &request);
+ defl_verdict = DENY;
+ parse_table(hosts_deny_table, &request);
+ return (0);
+}
+
+/* usage - explain */
+
+static void usage()
+{
+ fprintf(stderr, "usage: %s [-a] [-d] [-i inet_conf] [-v]\n", myname);
+ fprintf(stderr, " -a: report rules with implicit \"ALLOW\" at end\n");
+ fprintf(stderr, " -d: use allow/deny files in current directory\n");
+ fprintf(stderr, " -i: location of inetd.conf file\n");
+ fprintf(stderr, " -v: list all rules\n");
+ exit(1);
+}
+
+/* parse_table - like table_match(), but examines _all_ entries */
+
+static void parse_table(table, request)
+char *table;
+struct request_info *request;
+{
+ FILE *fp;
+ int real_verdict;
+ char sv_list[BUFLEN]; /* becomes list of daemons */
+ char *cl_list; /* becomes list of requests */
+ char *sh_cmd; /* becomes optional shell command */
+ char buf[BUFSIZ];
+ int verdict;
+ struct tcpd_context saved_context;
+
+ saved_context = tcpd_context; /* stupid compilers */
+
+ if (fp = fopen(table, "r")) {
+ tcpd_context.file = table;
+ tcpd_context.line = 0;
+ while (xgets(sv_list, sizeof(sv_list), fp)) {
+ if (sv_list[strlen(sv_list) - 1] != '\n') {
+ tcpd_warn("missing newline or line too long");
+ continue;
+ }
+ if (sv_list[0] == '#' || sv_list[strspn(sv_list, " \t\r\n")] == 0)
+ continue;
+ if ((cl_list = split_at(sv_list, ':')) == 0) {
+ tcpd_warn("missing \":\" separator");
+ continue;
+ }
+ sh_cmd = split_at(cl_list, ':');
+
+ if (hosts_access_verbose)
+ printf("\n>>> Rule %s line %d:\n",
+ tcpd_context.file, tcpd_context.line);
+
+ if (hosts_access_verbose)
+ print_list("daemons: ", sv_list);
+ check_daemon_list(sv_list);
+
+ if (hosts_access_verbose)
+ print_list("clients: ", cl_list);
+ check_client_list(cl_list);
+
+#ifdef PROCESS_OPTIONS
+ real_verdict = defl_verdict;
+ if (sh_cmd) {
+ verdict = setjmp(tcpd_buf);
+ if (verdict != 0) {
+ real_verdict = (verdict == AC_PERMIT);
+ } else {
+ dry_run = 1;
+ process_options(sh_cmd, request);
+ if (dry_run == 1 && real_verdict && allow_check)
+ tcpd_warn("implicit \"allow\" at end of rule");
+ }
+ } else if (defl_verdict && allow_check) {
+ tcpd_warn("implicit \"allow\" at end of rule");
+ }
+ if (hosts_access_verbose)
+ printf("access: %s\n", real_verdict ? "granted" : "denied");
+#else
+ if (sh_cmd)
+ shell_cmd(percent_x(buf, sizeof(buf), sh_cmd, request));
+ if (hosts_access_verbose)
+ printf("access: %s\n", defl_verdict ? "granted" : "denied");
+#endif
+ }
+ (void) fclose(fp);
+ } else if (errno != ENOENT) {
+ tcpd_warn("cannot open %s: %m", table);
+ }
+ tcpd_context = saved_context;
+}
+
+/* print_list - pretty-print a list */
+
+static void print_list(title, list)
+char *title;
+char *list;
+{
+ char buf[BUFLEN];
+ char *cp;
+ char *next;
+
+ fputs(title, stdout);
+ strcpy(buf, list);
+
+ for (cp = strtok(buf, sep); cp != 0; cp = next) {
+ fputs(cp, stdout);
+ next = strtok((char *) 0, sep);
+ if (next != 0)
+ fputs(" ", stdout);
+ }
+ fputs("\n", stdout);
+}
+
+/* check_daemon_list - criticize daemon list */
+
+static void check_daemon_list(list)
+char *list;
+{
+ char buf[BUFLEN];
+ char *cp;
+ char *host;
+ int daemons = 0;
+
+ strcpy(buf, list);
+
+ for (cp = strtok(buf, sep); cp != 0; cp = strtok((char *) 0, sep)) {
+ if (STR_EQ(cp, "EXCEPT")) {
+ daemons = 0;
+ } else {
+ daemons++;
+ if ((host = split_at(cp + 1, '@')) != 0 && check_host(host) > 1) {
+ tcpd_warn("host %s has more than one address", host);
+ tcpd_warn("(consider using an address instead)");
+ }
+ check_daemon(cp);
+ }
+ }
+ if (daemons == 0)
+ tcpd_warn("daemon list is empty or ends in EXCEPT");
+}
+
+/* check_client_list - criticize client list */
+
+static void check_client_list(list)
+char *list;
+{
+ char buf[BUFLEN];
+ char *cp;
+ char *host;
+ int clients = 0;
+
+ strcpy(buf, list);
+
+ for (cp = strtok(buf, sep); cp != 0; cp = strtok((char *) 0, sep)) {
+ if (STR_EQ(cp, "EXCEPT")) {
+ clients = 0;
+ } else {
+ clients++;
+ if (host = split_at(cp + 1, '@')) { /* user@host */
+ check_user(cp);
+ check_host(host);
+ } else {
+ check_host(cp);
+ }
+ }
+ }
+ if (clients == 0)
+ tcpd_warn("client list is empty or ends in EXCEPT");
+}
+
+/* check_daemon - criticize daemon pattern */
+
+static void check_daemon(pat)
+char *pat;
+{
+ if (pat[0] == '@') {
+ tcpd_warn("%s: daemon name begins with \"@\"", pat);
+ } else if (pat[0] == '.') {
+ tcpd_warn("%s: daemon name begins with dot", pat);
+ } else if (pat[strlen(pat) - 1] == '.') {
+ tcpd_warn("%s: daemon name ends in dot", pat);
+ } else if (STR_EQ(pat, "ALL") || STR_EQ(pat, unknown)) {
+ /* void */ ;
+ } else if (STR_EQ(pat, "FAIL")) { /* obsolete */
+ tcpd_warn("FAIL is no longer recognized");
+ tcpd_warn("(use EXCEPT or DENY instead)");
+ } else if (reserved_name(pat)) {
+ tcpd_warn("%s: daemon name may be reserved word", pat);
+ } else {
+ switch (inet_get(pat)) {
+ case WR_UNKNOWN:
+ tcpd_warn("%s: no such process name in %s", pat, inetcf);
+ inet_set(pat, WR_YES); /* shut up next time */
+ break;
+ case WR_NOT:
+ tcpd_warn("%s: service possibly not wrapped", pat);
+ inet_set(pat, WR_YES);
+ break;
+ }
+ }
+}
+
+/* check_user - criticize user pattern */
+
+static void check_user(pat)
+char *pat;
+{
+ if (pat[0] == '@') { /* @netgroup */
+ tcpd_warn("%s: user name begins with \"@\"", pat);
+ } else if (pat[0] == '.') {
+ tcpd_warn("%s: user name begins with dot", pat);
+ } else if (pat[strlen(pat) - 1] == '.') {
+ tcpd_warn("%s: user name ends in dot", pat);
+ } else if (STR_EQ(pat, "ALL") || STR_EQ(pat, unknown)
+ || STR_EQ(pat, "KNOWN")) {
+ /* void */ ;
+ } else if (STR_EQ(pat, "FAIL")) { /* obsolete */
+ tcpd_warn("FAIL is no longer recognized");
+ tcpd_warn("(use EXCEPT or DENY instead)");
+ } else if (reserved_name(pat)) {
+ tcpd_warn("%s: user name may be reserved word", pat);
+ }
+}
+
+/* check_host - criticize host pattern */
+
+static int check_host(pat)
+char *pat;
+{
+ char *mask;
+ int addr_count = 1;
+
+ if (pat[0] == '@') { /* @netgroup */
+#ifdef NO_NETGRENT
+ /* SCO has no *netgrent() support */
+#else
+#ifdef NETGROUP
+ char *machinep;
+ char *userp;
+ char *domainp;
+
+ setnetgrent(pat + 1);
+ if (getnetgrent(&machinep, &userp, &domainp) == 0)
+ tcpd_warn("%s: unknown or empty netgroup", pat + 1);
+ endnetgrent();
+#else
+ tcpd_warn("netgroup support disabled");
+#endif
+#endif
+ } else if (mask = split_at(pat, '/')) { /* network/netmask */
+ if (dot_quad_addr(pat) == INADDR_NONE
+ || dot_quad_addr(mask) == INADDR_NONE)
+ tcpd_warn("%s/%s: bad net/mask pattern", pat, mask);
+ } else if (STR_EQ(pat, "FAIL")) { /* obsolete */
+ tcpd_warn("FAIL is no longer recognized");
+ tcpd_warn("(use EXCEPT or DENY instead)");
+ } else if (reserved_name(pat)) { /* other reserved */
+ /* void */ ;
+ } else if (NOT_INADDR(pat)) { /* internet name */
+ if (pat[strlen(pat) - 1] == '.') {
+ tcpd_warn("%s: domain or host name ends in dot", pat);
+ } else if (pat[0] != '.') {
+ addr_count = check_dns(pat);
+ }
+ } else { /* numeric form */
+ if (STR_EQ(pat, "0.0.0.0") || STR_EQ(pat, "255.255.255.255")) {
+ /* void */ ;
+ } else if (pat[0] == '.') {
+ tcpd_warn("%s: network number begins with dot", pat);
+ } else if (pat[strlen(pat) - 1] != '.') {
+ check_dns(pat);
+ }
+ }
+ return (addr_count);
+}
+
+/* reserved_name - determine if name is reserved */
+
+static int reserved_name(pat)
+char *pat;
+{
+ return (STR_EQ(pat, unknown)
+ || STR_EQ(pat, "KNOWN")
+ || STR_EQ(pat, paranoid)
+ || STR_EQ(pat, "ALL")
+ || STR_EQ(pat, "LOCAL"));
+}
diff --git a/contrib/tcp_wrappers/tcpdmatch.8 b/contrib/tcp_wrappers/tcpdmatch.8
new file mode 100644
index 000000000000..ebd8c7874c3f
--- /dev/null
+++ b/contrib/tcp_wrappers/tcpdmatch.8
@@ -0,0 +1,98 @@
+.TH TCPDMATCH 8
+.SH NAME
+tcpdmatch \- tcp wrapper oracle
+.SH SYNOPSYS
+tcpdmatch [-d] [-i inet_conf] daemon client
+.sp
+tcpdmatch [-d] [-i inet_conf] daemon[@server] [user@]client
+.SH DESCRIPTION
+.PP
+\fItcpdmatch\fR predicts how the tcp wrapper would handle a specific
+request for service. Examples are given below.
+.PP
+The program examines the \fItcpd\fR access control tables (default
+\fI/etc/hosts.allow\fR and \fI/etc/hosts.deny\fR) and prints its
+conclusion. For maximal accuracy, it extracts additional information
+from your \fIinetd\fR or \fItlid\fR network configuration file.
+.PP
+When \fItcpdmatch\fR finds a match in the access control tables, it
+identifies the matched rule. In addition, it displays the optional
+shell commands or options in a pretty-printed format; this makes it
+easier for you to spot any discrepancies between what you want and what
+the program understands.
+.SH ARGUMENTS
+The following two arguments are always required:
+.IP daemon
+A daemon process name. Typically, the last component of a daemon
+executable pathname.
+.IP client
+A host name or network address, or one of the `unknown' or `paranoid'
+wildcard patterns.
+.sp
+When a client host name is specified, \fItcpdmatch\fR gives a
+prediction for each address listed for that client.
+.sp
+When a client address is specified, \fItcpdmatch\fR predicts what
+\fItcpd\fR would do when client name lookup fails.
+.PP
+Optional information specified with the \fIdaemon@server\fR form:
+.IP server
+A host name or network address, or one of the `unknown' or `paranoid'
+wildcard patterns. The default server name is `unknown'.
+.PP
+Optional information specified with the \fIuser@client\fR form:
+.IP user
+A client user identifier. Typically, a login name or a numeric userid.
+The default user name is `unknown'.
+.SH OPTIONS
+.IP -d
+Examine \fIhosts.allow\fR and \fIhosts.deny\fR files in the current
+directory instead of the default ones.
+.IP "-i inet_conf"
+Specify this option when \fItcpdmatch\fR is unable to find your
+\fIinetd.conf\fR or \fItlid.conf\fR network configuration file, or when
+you suspect that the program uses the wrong one.
+.SH EXAMPLES
+To predict how \fItcpd\fR would handle a telnet request from the local
+system:
+.sp
+.ti +5
+tcpdmatch in.telnetd localhost
+.PP
+The same request, pretending that hostname lookup failed:
+.sp
+.ti +5
+tcpdmatch in.telnetd 127.0.0.1
+.PP
+To predict what tcpd would do when the client name does not match the
+client address:
+.sp
+.ti +5
+tcpdmatch in.telnetd paranoid
+.PP
+On some systems, daemon names have no `in.' prefix, or \fItcpdmatch\fR
+may need some help to locate the inetd configuration file.
+.SH FILES
+.PP
+The default locations of the \fItcpd\fR access control tables are:
+.PP
+/etc/hosts.allow
+.br
+/etc/hosts.deny
+.SH SEE ALSO
+.na
+.nf
+tcpdchk(8), tcpd configuration checker
+hosts_access(5), format of the tcpd access control tables.
+hosts_options(5), format of the language extensions.
+inetd.conf(5), format of the inetd control file.
+tlid.conf(5), format of the tlid control file.
+.SH AUTHORS
+.na
+.nf
+Wietse Venema (wietse@wzv.win.tue.nl),
+Department of Mathematics and Computing Science,
+Eindhoven University of Technology
+Den Dolech 2, P.O. Box 513,
+5600 MB Eindhoven, The Netherlands
+\" @(#) tcpdmatch.8 1.5 96/02/11 17:01:35
diff --git a/contrib/tcp_wrappers/tcpdmatch.c b/contrib/tcp_wrappers/tcpdmatch.c
new file mode 100644
index 000000000000..b1cf75f25cee
--- /dev/null
+++ b/contrib/tcp_wrappers/tcpdmatch.c
@@ -0,0 +1,328 @@
+ /*
+ * tcpdmatch - explain what tcpd would do in a specific case
+ *
+ * usage: tcpdmatch [-d] [-i inet_conf] daemon[@host] [user@]host
+ *
+ * -d: use the access control tables in the current directory.
+ *
+ * -i: location of inetd.conf file.
+ *
+ * All errors are reported to the standard error stream, including the errors
+ * that would normally be reported via the syslog daemon.
+ *
+ * Author: Wietse Venema, Eindhoven University of Technology, The Netherlands.
+ */
+
+#ifndef lint
+static char sccsid[] = "@(#) tcpdmatch.c 1.5 96/02/11 17:01:36";
+#endif
+
+/* System libraries. */
+
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <arpa/inet.h>
+#include <netdb.h>
+#include <stdio.h>
+#include <syslog.h>
+#include <setjmp.h>
+#include <string.h>
+
+extern void exit();
+extern int optind;
+extern char *optarg;
+
+#ifndef INADDR_NONE
+#define INADDR_NONE (-1) /* XXX should be 0xffffffff */
+#endif
+
+#ifndef S_ISDIR
+#define S_ISDIR(m) (((m) & S_IFMT) == S_IFDIR)
+#endif
+
+/* Application-specific. */
+
+#include "tcpd.h"
+#include "inetcf.h"
+#include "scaffold.h"
+
+static void usage();
+static void tcpdmatch();
+
+/* The main program */
+
+int main(argc, argv)
+int argc;
+char **argv;
+{
+ struct hostent *hp;
+ char *myname = argv[0];
+ char *client;
+ char *server;
+ char *addr;
+ char *user;
+ char *daemon;
+ struct request_info request;
+ int ch;
+ char *inetcf = 0;
+ int count;
+ struct sockaddr_in server_sin;
+ struct sockaddr_in client_sin;
+ struct stat st;
+
+ /*
+ * Show what rule actually matched.
+ */
+ hosts_access_verbose = 2;
+
+ /*
+ * Parse the JCL.
+ */
+ while ((ch = getopt(argc, argv, "di:")) != EOF) {
+ switch (ch) {
+ case 'd':
+ hosts_allow_table = "hosts.allow";
+ hosts_deny_table = "hosts.deny";
+ break;
+ case 'i':
+ inetcf = optarg;
+ break;
+ default:
+ usage(myname);
+ /* NOTREACHED */
+ }
+ }
+ if (argc != optind + 2)
+ usage(myname);
+
+ /*
+ * When confusion really strikes...
+ */
+ if (check_path(REAL_DAEMON_DIR, &st) < 0) {
+ tcpd_warn("REAL_DAEMON_DIR %s: %m", REAL_DAEMON_DIR);
+ } else if (!S_ISDIR(st.st_mode)) {
+ tcpd_warn("REAL_DAEMON_DIR %s is not a directory", REAL_DAEMON_DIR);
+ }
+
+ /*
+ * Default is to specify a daemon process name. When daemon@host is
+ * specified, separate the two parts.
+ */
+ if ((server = split_at(argv[optind], '@')) == 0)
+ server = unknown;
+ if (argv[optind][0] == '/') {
+ daemon = strrchr(argv[optind], '/') + 1;
+ tcpd_warn("%s: daemon name normalized to: %s", argv[optind], daemon);
+ } else {
+ daemon = argv[optind];
+ }
+
+ /*
+ * Default is to specify a client hostname or address. When user@host is
+ * specified, separate the two parts.
+ */
+ if ((client = split_at(argv[optind + 1], '@')) != 0) {
+ user = argv[optind + 1];
+ } else {
+ client = argv[optind + 1];
+ user = unknown;
+ }
+
+ /*
+ * Analyze the inetd (or tlid) configuration file, so that we can warn
+ * the user about services that may not be wrapped, services that are not
+ * configured, or services that are wrapped in an incorrect manner. Allow
+ * for services that are not run from inetd, or that have tcpd access
+ * control built into them.
+ */
+ inetcf = inet_cfg(inetcf);
+ inet_set("portmap", WR_NOT);
+ inet_set("rpcbind", WR_NOT);
+ switch (inet_get(daemon)) {
+ case WR_UNKNOWN:
+ tcpd_warn("%s: no such process name in %s", daemon, inetcf);
+ break;
+ case WR_NOT:
+ tcpd_warn("%s: service possibly not wrapped", daemon);
+ break;
+ }
+
+ /*
+ * Check accessibility of access control files.
+ */
+ (void) check_path(hosts_allow_table, &st);
+ (void) check_path(hosts_deny_table, &st);
+
+ /*
+ * Fill in what we have figured out sofar. Use socket and DNS routines
+ * for address and name conversions. We attach stdout to the request so
+ * that banner messages will become visible.
+ */
+ request_init(&request, RQ_DAEMON, daemon, RQ_USER, user, RQ_FILE, 1, 0);
+ sock_methods(&request);
+
+ /*
+ * If a server hostname is specified, insist that the name maps to at
+ * most one address. eval_hostname() warns the user about name server
+ * problems, while using the request.server structure as a cache for host
+ * address and name conversion results.
+ */
+ if (NOT_INADDR(server) == 0 || HOSTNAME_KNOWN(server)) {
+ if ((hp = find_inet_addr(server)) == 0)
+ exit(1);
+ memset((char *) &server_sin, 0, sizeof(server_sin));
+ server_sin.sin_family = AF_INET;
+ request_set(&request, RQ_SERVER_SIN, &server_sin, 0);
+
+ for (count = 0; (addr = hp->h_addr_list[count]) != 0; count++) {
+ memcpy((char *) &server_sin.sin_addr, addr,
+ sizeof(server_sin.sin_addr));
+
+ /*
+ * Force evaluation of server host name and address. Host name
+ * conflicts will be reported while eval_hostname() does its job.
+ */
+ request_set(&request, RQ_SERVER_NAME, "", RQ_SERVER_ADDR, "", 0);
+ if (STR_EQ(eval_hostname(request.server), unknown))
+ tcpd_warn("host address %s->name lookup failed",
+ eval_hostaddr(request.server));
+ }
+ if (count > 1) {
+ fprintf(stderr, "Error: %s has more than one address\n", server);
+ fprintf(stderr, "Please specify an address instead\n");
+ exit(1);
+ }
+ free((char *) hp);
+ } else {
+ request_set(&request, RQ_SERVER_NAME, server, 0);
+ }
+
+ /*
+ * If a client address is specified, we simulate the effect of client
+ * hostname lookup failure.
+ */
+ if (dot_quad_addr(client) != INADDR_NONE) {
+ request_set(&request, RQ_CLIENT_ADDR, client, 0);
+ tcpdmatch(&request);
+ exit(0);
+ }
+
+ /*
+ * Perhaps they are testing special client hostname patterns that aren't
+ * really host names at all.
+ */
+ if (NOT_INADDR(client) && HOSTNAME_KNOWN(client) == 0) {
+ request_set(&request, RQ_CLIENT_NAME, client, 0);
+ tcpdmatch(&request);
+ exit(0);
+ }
+
+ /*
+ * Otherwise, assume that a client hostname is specified, and insist that
+ * the address can be looked up. The reason for this requirement is that
+ * in real life the client address is available (at least with IP). Let
+ * eval_hostname() figure out if this host is properly registered, while
+ * using the request.client structure as a cache for host name and
+ * address conversion results.
+ */
+ if ((hp = find_inet_addr(client)) == 0)
+ exit(1);
+ memset((char *) &client_sin, 0, sizeof(client_sin));
+ client_sin.sin_family = AF_INET;
+ request_set(&request, RQ_CLIENT_SIN, &client_sin, 0);
+
+ for (count = 0; (addr = hp->h_addr_list[count]) != 0; count++) {
+ memcpy((char *) &client_sin.sin_addr, addr,
+ sizeof(client_sin.sin_addr));
+
+ /*
+ * Force evaluation of client host name and address. Host name
+ * conflicts will be reported while eval_hostname() does its job.
+ */
+ request_set(&request, RQ_CLIENT_NAME, "", RQ_CLIENT_ADDR, "", 0);
+ if (STR_EQ(eval_hostname(request.client), unknown))
+ tcpd_warn("host address %s->name lookup failed",
+ eval_hostaddr(request.client));
+ tcpdmatch(&request);
+ if (hp->h_addr_list[count + 1])
+ printf("\n");
+ }
+ free((char *) hp);
+ exit(0);
+}
+
+/* Explain how to use this program */
+
+static void usage(myname)
+char *myname;
+{
+ fprintf(stderr, "usage: %s [-d] [-i inet_conf] daemon[@host] [user@]host\n",
+ myname);
+ fprintf(stderr, " -d: use allow/deny files in current directory\n");
+ fprintf(stderr, " -i: location of inetd.conf file\n");
+ exit(1);
+}
+
+/* Print interesting expansions */
+
+static void expand(text, pattern, request)
+char *text;
+char *pattern;
+struct request_info *request;
+{
+ char buf[BUFSIZ];
+
+ if (STR_NE(percent_x(buf, sizeof(buf), pattern, request), unknown))
+ printf("%s %s\n", text, buf);
+}
+
+/* Try out a (server,client) pair */
+
+static void tcpdmatch(request)
+struct request_info *request;
+{
+ int verdict;
+
+ /*
+ * Show what we really know. Suppress uninteresting noise.
+ */
+ expand("client: hostname", "%n", request);
+ expand("client: address ", "%a", request);
+ expand("client: username", "%u", request);
+ expand("server: hostname", "%N", request);
+ expand("server: address ", "%A", request);
+ expand("server: process ", "%d", request);
+
+ /*
+ * Reset stuff that might be changed by options handlers. In dry-run
+ * mode, extension language routines that would not return should inform
+ * us of their plan, by clearing the dry_run flag. This is a bit clumsy
+ * but we must be able to verify hosts with more than one network
+ * address.
+ */
+ rfc931_timeout = RFC931_TIMEOUT;
+ allow_severity = SEVERITY;
+ deny_severity = LOG_WARNING;
+ dry_run = 1;
+
+ /*
+ * When paranoid mode is enabled, access is rejected no matter what the
+ * access control rules say.
+ */
+#ifdef PARANOID
+ if (STR_EQ(eval_hostname(request->client), paranoid)) {
+ printf("access: denied (PARANOID mode)\n\n");
+ return;
+ }
+#endif
+
+ /*
+ * Report the access control verdict.
+ */
+ verdict = hosts_access(request);
+ printf("access: %s\n",
+ dry_run == 0 ? "delegated" :
+ verdict ? "granted" : "denied");
+}
diff --git a/contrib/tcp_wrappers/tli-sequent.c b/contrib/tcp_wrappers/tli-sequent.c
new file mode 100644
index 000000000000..8858966876a4
--- /dev/null
+++ b/contrib/tcp_wrappers/tli-sequent.c
@@ -0,0 +1,193 @@
+ /*
+ * Warning - this relies heavily on the TLI implementation in PTX 2.X and will
+ * probably not work under PTX 4.
+ *
+ * Author: Tim Wright, Sequent Computer Systems Ltd., UK.
+ *
+ * Modified slightly to conform to the new internal interfaces - Wietse
+ */
+
+#ifndef lint
+static char sccsid[] = "@(#) tli-sequent.c 1.1 94/12/28 17:42:51";
+#endif
+
+#ifdef TLI_SEQUENT
+
+/* System libraries. */
+
+#include <sys/types.h>
+#include <sys/param.h>
+#include <sys/stat.h>
+#include <sys/tiuser.h>
+#include <sys/stream.h>
+#include <sys/stropts.h>
+#include <sys/tihdr.h>
+#include <sys/timod.h>
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <stdio.h>
+#include <syslog.h>
+#include <errno.h>
+#include <string.h>
+
+extern int errno;
+extern char *sys_errlist[];
+extern int sys_nerr;
+extern int t_errno;
+extern char *t_errlist[];
+extern int t_nerr;
+
+/* Local stuff. */
+
+#include "tcpd.h"
+#include "tli-sequent.h"
+
+/* Forward declarations. */
+
+static char *tli_error();
+static void tli_sink();
+
+/* tli_host - determine endpoint info */
+
+int tli_host(request)
+struct request_info *request;
+{
+ static struct sockaddr_in client;
+ static struct sockaddr_in server;
+ struct _ti_user *tli_state_ptr;
+ union T_primitives *TSI_prim_ptr;
+ struct strpeek peek;
+ int len;
+
+ /*
+ * Use DNS and socket routines for name and address conversions.
+ */
+
+ sock_methods(request);
+
+ /*
+ * Find out the client address using getpeerinaddr(). This call is the
+ * TLI equivalent to getpeername() under Dynix/ptx.
+ */
+
+ len = sizeof(client);
+ t_sync(request->fd);
+ if (getpeerinaddr(request->fd, &client, len) < 0) {
+ tcpd_warn("can't get client address: %s", tli_error());
+ return;
+ }
+ request->client->sin = &client;
+
+ /* Call TLI utility routine to get information on endpoint */
+ if ((tli_state_ptr = _t_checkfd(request->fd)) == NULL)
+ return;
+
+ if (tli_state_ptr->ti_servtype == T_CLTS) {
+ /* UDP - may need to get address the hard way */
+ if (client.sin_addr.s_addr == 0) {
+ /* The UDP endpoint is not connected so we didn't get the */
+ /* remote address - get it the hard way ! */
+
+ /* Look at the control part of the top message on the stream */
+ /* we don't want to remove it from the stream so we use I_PEEK */
+ peek.ctlbuf.maxlen = tli_state_ptr->ti_ctlsize;
+ peek.ctlbuf.len = 0;
+ peek.ctlbuf.buf = tli_state_ptr->ti_ctlbuf;
+ /* Don't even look at the data */
+ peek.databuf.maxlen = -1;
+ peek.databuf.len = 0;
+ peek.databuf.buf = 0;
+ peek.flags = 0;
+
+ switch (ioctl(request->fd, I_PEEK, &peek)) {
+ case -1:
+ tcpd_warn("can't peek at endpoint: %s", tli_error());
+ return;
+ case 0:
+ /* No control part - we're hosed */
+ tcpd_warn("can't get UDP info: %s", tli_error());
+ return;
+ default:
+ /* FALL THROUGH */
+ ;
+ }
+ /* Can we even check the PRIM_type ? */
+ if (peek.ctlbuf.len < sizeof(long)) {
+ tcpd_warn("UDP control info garbage");
+ return;
+ }
+ TSI_prim_ptr = (union T_primitives *) peek.ctlbuf.buf;
+ if (TSI_prim_ptr->type != T_UNITDATA_IND) {
+ tcpd_warn("wrong type for UDP control info");
+ return;
+ }
+ /* Validate returned unitdata indication packet */
+ if ((peek.ctlbuf.len < sizeof(struct T_unitdata_ind)) ||
+ ((TSI_prim_ptr->unitdata_ind.OPT_length != 0) &&
+ (peek.ctlbuf.len <
+ TSI_prim_ptr->unitdata_ind.OPT_length +
+ TSI_prim_ptr->unitdata_ind.OPT_offset))) {
+ tcpd_warn("UDP control info garbaged");
+ return;
+ }
+ /* Extract the address */
+ memcpy(&client,
+ peek.ctlbuf.buf + TSI_prim_ptr->unitdata_ind.SRC_offset,
+ TSI_prim_ptr->unitdata_ind.SRC_length);
+ }
+ request->sink = tli_sink;
+ }
+ if (getmyinaddr(request->fd, &server, len) < 0)
+ tcpd_warn("can't get local address: %s", tli_error());
+ else
+ request->server->sin = &server;
+}
+
+/* tli_error - convert tli error number to text */
+
+static char *tli_error()
+{
+ static char buf[40];
+
+ if (t_errno != TSYSERR) {
+ if (t_errno < 0 || t_errno >= t_nerr) {
+ sprintf(buf, "Unknown TLI error %d", t_errno);
+ return (buf);
+ } else {
+ return (t_errlist[t_errno]);
+ }
+ } else {
+ if (errno < 0 || errno >= sys_nerr) {
+ sprintf(buf, "Unknown UNIX error %d", errno);
+ return (buf);
+ } else {
+ return (sys_errlist[errno]);
+ }
+ }
+}
+
+/* tli_sink - absorb unreceived datagram */
+
+static void tli_sink(fd)
+int fd;
+{
+ struct t_unitdata *unit;
+ int flags;
+
+ /*
+ * Something went wrong. Absorb the datagram to keep inetd from looping.
+ * Allocate storage for address, control and data. If that fails, sleep
+ * for a couple of seconds in an attempt to keep inetd from looping too
+ * fast.
+ */
+
+ if ((unit = (struct t_unitdata *) t_alloc(fd, T_UNITDATA, T_ALL)) == 0) {
+ tcpd_warn("t_alloc: %s", tli_error());
+ sleep(5);
+ } else {
+ (void) t_rcvudata(fd, unit, &flags);
+ t_free((void *) unit, T_UNITDATA);
+ }
+}
+
+#endif /* TLI_SEQUENT */
diff --git a/contrib/tcp_wrappers/tli-sequent.h b/contrib/tcp_wrappers/tli-sequent.h
new file mode 100644
index 000000000000..4474d3cdb6fa
--- /dev/null
+++ b/contrib/tcp_wrappers/tli-sequent.h
@@ -0,0 +1,13 @@
+#ifdef __STDC__
+#define __P(X) X
+#else
+#define __P(X) ()
+#endif
+
+extern int t_sync __P((int));
+extern char *t_alloc __P((int, int, int));
+extern int t_free __P((char *, int));
+extern int t_rcvudata __P((int, struct t_unitdata *, int *));
+extern int getpeerinaddr __P((int, struct sockaddr_in *, int));
+extern int getmyinaddr __P((int, struct sockaddr_in *, int));
+extern struct _ti_user *_t_checkfd __P((int));
diff --git a/contrib/tcp_wrappers/tli.c b/contrib/tcp_wrappers/tli.c
new file mode 100644
index 000000000000..14579d1cbacb
--- /dev/null
+++ b/contrib/tcp_wrappers/tli.c
@@ -0,0 +1,341 @@
+ /*
+ * tli_host() determines the type of transport (connected, connectionless),
+ * the transport address of a client host, and the transport address of a
+ * server endpoint. In addition, it provides methods to map a transport
+ * address to a printable host name or address. Socket address results are
+ * in static memory; tli structures are allocated from the heap.
+ *
+ * The result from the hostname lookup method is STRING_PARANOID when a host
+ * pretends to have someone elses name, or when a host name is available but
+ * could not be verified.
+ *
+ * Diagnostics are reported through syslog(3).
+ *
+ * Author: Wietse Venema, Eindhoven University of Technology, The Netherlands.
+ */
+
+#ifndef lint
+static char sccsid[] = "@(#) tli.c 1.15 97/03/21 19:27:25";
+#endif
+
+#ifdef TLI
+
+/* System libraries. */
+
+#include <sys/types.h>
+#include <sys/param.h>
+#include <sys/stream.h>
+#include <sys/stat.h>
+#include <sys/mkdev.h>
+#include <sys/tiuser.h>
+#include <sys/timod.h>
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <stdio.h>
+#include <syslog.h>
+#include <errno.h>
+#include <netconfig.h>
+#include <netdir.h>
+#include <string.h>
+
+extern char *nc_sperror();
+extern int errno;
+extern char *sys_errlist[];
+extern int sys_nerr;
+extern int t_errno;
+extern char *t_errlist[];
+extern int t_nerr;
+
+/* Local stuff. */
+
+#include "tcpd.h"
+
+/* Forward declarations. */
+
+static void tli_endpoints();
+static struct netconfig *tli_transport();
+static void tli_hostname();
+static void tli_hostaddr();
+static void tli_cleanup();
+static char *tli_error();
+static void tli_sink();
+
+/* tli_host - look up endpoint addresses and install conversion methods */
+
+void tli_host(request)
+struct request_info *request;
+{
+ static struct sockaddr_in client;
+ static struct sockaddr_in server;
+
+ /*
+ * If we discover that we are using an IP transport, pretend we never
+ * were here. Otherwise, use the transport-independent method and stick
+ * to generic network addresses. XXX hard-coded protocol family name.
+ */
+
+ tli_endpoints(request);
+ if ((request->config = tli_transport(request->fd)) != 0
+ && STR_EQ(request->config->nc_protofmly, "inet")) {
+ if (request->client->unit != 0) {
+ client = *(struct sockaddr_in *) request->client->unit->addr.buf;
+ request->client->sin = &client;
+ }
+ if (request->server->unit != 0) {
+ server = *(struct sockaddr_in *) request->server->unit->addr.buf;
+ request->server->sin = &server;
+ }
+ tli_cleanup(request);
+ sock_methods(request);
+ } else {
+ request->hostname = tli_hostname;
+ request->hostaddr = tli_hostaddr;
+ request->cleanup = tli_cleanup;
+ }
+}
+
+/* tli_cleanup - cleanup some dynamically-allocated data structures */
+
+static void tli_cleanup(request)
+struct request_info *request;
+{
+ if (request->config != 0)
+ freenetconfigent(request->config);
+ if (request->client->unit != 0)
+ t_free((char *) request->client->unit, T_UNITDATA);
+ if (request->server->unit != 0)
+ t_free((char *) request->server->unit, T_UNITDATA);
+}
+
+/* tli_endpoints - determine TLI client and server endpoint information */
+
+static void tli_endpoints(request)
+struct request_info *request;
+{
+ struct t_unitdata *server;
+ struct t_unitdata *client;
+ int fd = request->fd;
+ int flags;
+
+ /*
+ * Determine the client endpoint address. With unconnected services, peek
+ * at the sender address of the pending protocol data unit without
+ * popping it off the receive queue. This trick works because only the
+ * address member of the unitdata structure has been allocated.
+ *
+ * Beware of successful returns with zero-length netbufs (for example,
+ * Solaris 2.3 with ticlts transport). The netdir(3) routines can't
+ * handle that. Assume connection-less transport when TI_GETPEERNAME
+ * produces no usable result, even when t_rcvudata() is unable to figure
+ * out the peer address. Better to hang than to loop.
+ */
+
+ if ((client = (struct t_unitdata *) t_alloc(fd, T_UNITDATA, T_ADDR)) == 0) {
+ tcpd_warn("t_alloc: %s", tli_error());
+ return;
+ }
+ if (ioctl(fd, TI_GETPEERNAME, &client->addr) < 0 || client->addr.len == 0) {
+ request->sink = tli_sink;
+ if (t_rcvudata(fd, client, &flags) < 0 || client->addr.len == 0) {
+ tcpd_warn("can't get client address: %s", tli_error());
+ t_free((void *) client, T_UNITDATA);
+ return;
+ }
+ }
+ request->client->unit = client;
+
+ /*
+ * Look up the server endpoint address. This can be used for filtering on
+ * server address or name, or to look up the client user.
+ */
+
+ if ((server = (struct t_unitdata *) t_alloc(fd, T_UNITDATA, T_ADDR)) == 0) {
+ tcpd_warn("t_alloc: %s", tli_error());
+ return;
+ }
+ if (ioctl(fd, TI_GETMYNAME, &server->addr) < 0) {
+ tcpd_warn("TI_GETMYNAME: %m");
+ t_free((void *) server, T_UNITDATA);
+ return;
+ }
+ request->server->unit = server;
+}
+
+/* tli_transport - find out TLI transport type */
+
+static struct netconfig *tli_transport(fd)
+int fd;
+{
+ struct stat from_client;
+ struct stat from_config;
+ void *handlep;
+ struct netconfig *config;
+
+ /*
+ * Assuming that the network device is a clone device, we must compare
+ * the major device number of stdin to the minor device number of the
+ * devices listed in the netconfig table.
+ */
+
+ if (fstat(fd, &from_client) != 0) {
+ tcpd_warn("fstat(fd %d): %m", fd);
+ return (0);
+ }
+ if ((handlep = setnetconfig()) == 0) {
+ tcpd_warn("setnetconfig: %m");
+ return (0);
+ }
+ while (config = getnetconfig(handlep)) {
+ if (stat(config->nc_device, &from_config) == 0) {
+ if (minor(from_config.st_rdev) == major(from_client.st_rdev))
+ break;
+ }
+ }
+ if (config == 0) {
+ tcpd_warn("unable to identify transport protocol");
+ return (0);
+ }
+
+ /*
+ * Something else may clobber our getnetconfig() result, so we'd better
+ * acquire our private copy.
+ */
+
+ if ((config = getnetconfigent(config->nc_netid)) == 0) {
+ tcpd_warn("getnetconfigent(%s): %s", config->nc_netid, nc_sperror());
+ return (0);
+ }
+ return (config);
+}
+
+/* tli_hostaddr - map TLI transport address to printable address */
+
+static void tli_hostaddr(host)
+struct host_info *host;
+{
+ struct request_info *request = host->request;
+ struct netconfig *config = request->config;
+ struct t_unitdata *unit = host->unit;
+ char *uaddr;
+
+ if (config != 0 && unit != 0
+ && (uaddr = taddr2uaddr(config, &unit->addr)) != 0) {
+ STRN_CPY(host->addr, uaddr, sizeof(host->addr));
+ free(uaddr);
+ }
+}
+
+/* tli_hostname - map TLI transport address to hostname */
+
+static void tli_hostname(host)
+struct host_info *host;
+{
+ struct request_info *request = host->request;
+ struct netconfig *config = request->config;
+ struct t_unitdata *unit = host->unit;
+ struct nd_hostservlist *servlist;
+
+ if (config != 0 && unit != 0
+ && netdir_getbyaddr(config, &servlist, &unit->addr) == ND_OK) {
+
+ struct nd_hostserv *service = servlist->h_hostservs;
+ struct nd_addrlist *addr_list;
+ int found = 0;
+
+ if (netdir_getbyname(config, service, &addr_list) != ND_OK) {
+
+ /*
+ * Unable to verify that the name matches the address. This may
+ * be a transient problem or a botched name server setup. We
+ * decide to play safe.
+ */
+
+ tcpd_warn("can't verify hostname: netdir_getbyname(%.*s) failed",
+ STRING_LENGTH, service->h_host);
+
+ } else {
+
+ /*
+ * Look up the host address in the address list we just got. The
+ * comparison is done on the textual representation, because the
+ * transport address is an opaque structure that may have holes
+ * with uninitialized garbage. This approach obviously loses when
+ * the address does not have a textual representation.
+ */
+
+ char *uaddr = eval_hostaddr(host);
+ char *ua;
+ int i;
+
+ for (i = 0; found == 0 && i < addr_list->n_cnt; i++) {
+ if ((ua = taddr2uaddr(config, &(addr_list->n_addrs[i]))) != 0) {
+ found = !strcmp(ua, uaddr);
+ free(ua);
+ }
+ }
+ netdir_free((void *) addr_list, ND_ADDRLIST);
+
+ /*
+ * When the host name does not map to the initial address, assume
+ * someone has compromised a name server. More likely someone
+ * botched it, but that could be dangerous, too.
+ */
+
+ if (found == 0)
+ tcpd_warn("host name/address mismatch: %s != %.*s",
+ host->addr, STRING_LENGTH, service->h_host);
+ }
+ STRN_CPY(host->name, found ? service->h_host : paranoid,
+ sizeof(host->name));
+ netdir_free((void *) servlist, ND_HOSTSERVLIST);
+ }
+}
+
+/* tli_error - convert tli error number to text */
+
+static char *tli_error()
+{
+ static char buf[40];
+
+ if (t_errno != TSYSERR) {
+ if (t_errno < 0 || t_errno >= t_nerr) {
+ sprintf(buf, "Unknown TLI error %d", t_errno);
+ return (buf);
+ } else {
+ return (t_errlist[t_errno]);
+ }
+ } else {
+ if (errno < 0 || errno >= sys_nerr) {
+ sprintf(buf, "Unknown UNIX error %d", errno);
+ return (buf);
+ } else {
+ return (sys_errlist[errno]);
+ }
+ }
+}
+
+/* tli_sink - absorb unreceived datagram */
+
+static void tli_sink(fd)
+int fd;
+{
+ struct t_unitdata *unit;
+ int flags;
+
+ /*
+ * Something went wrong. Absorb the datagram to keep inetd from looping.
+ * Allocate storage for address, control and data. If that fails, sleep
+ * for a couple of seconds in an attempt to keep inetd from looping too
+ * fast.
+ */
+
+ if ((unit = (struct t_unitdata *) t_alloc(fd, T_UNITDATA, T_ALL)) == 0) {
+ tcpd_warn("t_alloc: %s", tli_error());
+ sleep(5);
+ } else {
+ (void) t_rcvudata(fd, unit, &flags);
+ t_free((void *) unit, T_UNITDATA);
+ }
+}
+
+#endif /* TLI */
diff --git a/contrib/tcp_wrappers/try-from.c b/contrib/tcp_wrappers/try-from.c
new file mode 100644
index 000000000000..925e144d90b1
--- /dev/null
+++ b/contrib/tcp_wrappers/try-from.c
@@ -0,0 +1,85 @@
+ /*
+ * This program can be called via a remote shell command to find out if the
+ * hostname and address are properly recognized, if username lookup works,
+ * and (SysV only) if the TLI on top of IP heuristics work.
+ *
+ * Example: "rsh host /some/where/try-from".
+ *
+ * Diagnostics are reported through syslog(3) and redirected to stderr.
+ *
+ * Author: Wietse Venema, Eindhoven University of Technology, The Netherlands.
+ */
+
+#ifndef lint
+static char sccsid[] = "@(#) try-from.c 1.2 94/12/28 17:42:55";
+#endif
+
+/* System libraries. */
+
+#include <sys/types.h>
+#include <stdio.h>
+#include <syslog.h>
+#include <string.h>
+
+#ifdef TLI
+#include <sys/tiuser.h>
+#include <stropts.h>
+#endif
+
+#ifndef STDIN_FILENO
+#define STDIN_FILENO 0
+#endif
+
+/* Local stuff. */
+
+#include "tcpd.h"
+
+int allow_severity = SEVERITY; /* run-time adjustable */
+int deny_severity = LOG_WARNING; /* ditto */
+
+main(argc, argv)
+int argc;
+char **argv;
+{
+ struct request_info request;
+ char buf[BUFSIZ];
+ char *cp;
+
+ /*
+ * Simplify the process name, just like tcpd would.
+ */
+ if ((cp = strrchr(argv[0], '/')) != 0)
+ argv[0] = cp + 1;
+
+ /*
+ * Turn on the "IP-underneath-TLI" detection heuristics.
+ */
+#ifdef TLI
+ if (ioctl(0, I_FIND, "timod") == 0)
+ ioctl(0, I_PUSH, "timod");
+#endif /* TLI */
+
+ /*
+ * Look up the endpoint information.
+ */
+ request_init(&request, RQ_DAEMON, argv[0], RQ_FILE, STDIN_FILENO, 0);
+ (void) fromhost(&request);
+
+ /*
+ * Show some results. Name and address information is looked up when we
+ * ask for it.
+ */
+
+#define EXPAND(str) percent_x(buf, sizeof(buf), str, &request)
+
+ puts(EXPAND("client address (%%a): %a"));
+ puts(EXPAND("client hostname (%%n): %n"));
+ puts(EXPAND("client username (%%u): %u"));
+ puts(EXPAND("client info (%%c): %c"));
+ puts(EXPAND("server address (%%A): %A"));
+ puts(EXPAND("server hostname (%%N): %N"));
+ puts(EXPAND("server process (%%d): %d"));
+ puts(EXPAND("server info (%%s): %s"));
+
+ return (0);
+}
diff --git a/contrib/tcp_wrappers/update.c b/contrib/tcp_wrappers/update.c
new file mode 100644
index 000000000000..a76cf2bb2375
--- /dev/null
+++ b/contrib/tcp_wrappers/update.c
@@ -0,0 +1,119 @@
+ /*
+ * Routines for controlled update/initialization of request structures.
+ *
+ * request_init() initializes its argument. Pointers and string-valued members
+ * are initialized to zero, to indicate that no lookup has been attempted.
+ *
+ * request_set() adds information to an already initialized request structure.
+ *
+ * Both functions take a variable-length name-value list.
+ *
+ * Diagnostics are reported through syslog(3).
+ *
+ * Author: Wietse Venema, Eindhoven University of Technology, The Netherlands.
+ */
+
+#ifndef lint
+static char sccsid[] = "@(#) update.c 1.1 94/12/28 17:42:56";
+#endif
+
+/* System libraries */
+
+#include <stdio.h>
+#include <syslog.h>
+#include <string.h>
+
+/* Local stuff. */
+
+#include "mystdarg.h"
+#include "tcpd.h"
+
+/* request_fill - request update engine */
+
+static struct request_info *request_fill(request, ap)
+struct request_info *request;
+va_list ap;
+{
+ int key;
+ char *ptr;
+
+ while ((key = va_arg(ap, int)) > 0) {
+ switch (key) {
+ default:
+ tcpd_warn("request_fill: invalid key: %d", key);
+ return (request);
+ case RQ_FILE:
+ request->fd = va_arg(ap, int);
+ continue;
+ case RQ_CLIENT_SIN:
+ request->client->sin = va_arg(ap, struct sockaddr_in *);
+ continue;
+ case RQ_SERVER_SIN:
+ request->server->sin = va_arg(ap, struct sockaddr_in *);
+ continue;
+
+ /*
+ * All other fields are strings with the same maximal length.
+ */
+
+ case RQ_DAEMON:
+ ptr = request->daemon;
+ break;
+ case RQ_USER:
+ ptr = request->user;
+ break;
+ case RQ_CLIENT_NAME:
+ ptr = request->client->name;
+ break;
+ case RQ_CLIENT_ADDR:
+ ptr = request->client->addr;
+ break;
+ case RQ_SERVER_NAME:
+ ptr = request->server->name;
+ break;
+ case RQ_SERVER_ADDR:
+ ptr = request->server->addr;
+ break;
+ }
+ STRN_CPY(ptr, va_arg(ap, char *), STRING_LENGTH);
+ }
+ return (request);
+}
+
+/* request_init - initialize request structure */
+
+struct request_info *VARARGS(request_init, struct request_info *, request)
+{
+ static struct request_info default_info;
+ struct request_info *r;
+ va_list ap;
+
+ /*
+ * Initialize data members. We do not assign default function pointer
+ * members, to avoid pulling in the whole socket module when it is not
+ * really needed.
+ */
+ VASTART(ap, struct request_info *, request);
+ *request = default_info;
+ request->fd = -1;
+ strcpy(request->daemon, unknown);
+ sprintf(request->pid, "%d", getpid());
+ request->client->request = request;
+ request->server->request = request;
+ r = request_fill(request, ap);
+ VAEND(ap);
+ return (r);
+}
+
+/* request_set - update request structure */
+
+struct request_info *VARARGS(request_set, struct request_info *, request)
+{
+ struct request_info *r;
+ va_list ap;
+
+ VASTART(ap, struct request_info *, request);
+ r = request_fill(request, ap);
+ VAEND(ap);
+ return (r);
+}
diff --git a/contrib/tcp_wrappers/vfprintf.c b/contrib/tcp_wrappers/vfprintf.c
new file mode 100644
index 000000000000..d6f37d59bfe8
--- /dev/null
+++ b/contrib/tcp_wrappers/vfprintf.c
@@ -0,0 +1,125 @@
+ /*
+ * vfprintf() and vprintf() clones. They will produce unexpected results
+ * when excessive dynamic ("*") field widths are specified. To be used for
+ * testing purposes only.
+ *
+ * Author: Wietse Venema, Eindhoven University of Technology, The Netherlands.
+ */
+
+#ifndef lint
+static char sccsid[] = "@(#) vfprintf.c 1.2 94/03/23 17:44:46";
+#endif
+
+#include <stdio.h>
+#include <ctype.h>
+#ifdef __STDC__
+#include <stdarg.h>
+#else
+#include <varargs.h>
+#endif
+
+/* vfprintf - print variable-length argument list to stream */
+
+int vfprintf(fp, format, ap)
+FILE *fp;
+char *format;
+va_list ap;
+{
+ char fmt[BUFSIZ]; /* format specifier */
+ register char *fmtp;
+ register char *cp;
+ int count = 0;
+
+ /*
+ * Iterate over characters in the format string, picking up arguments
+ * when format specifiers are found.
+ */
+
+ for (cp = format; *cp; cp++) {
+ if (*cp != '%') {
+ putc(*cp, fp); /* ordinary character */
+ count++;
+ } else {
+
+ /*
+ * Format specifiers are handled one at a time, since we can only
+ * deal with arguments one at a time. Try to determine the end of
+ * the format specifier. We do not attempt to fully parse format
+ * strings, since we are ging to let fprintf() do the hard work.
+ * In regular expression notation, we recognize:
+ *
+ * %-?0?([0-9]+|\*)?\.?([0-9]+|\*)?l?[a-z]
+ *
+ * which includes some combinations that do not make sense.
+ */
+
+ fmtp = fmt;
+ *fmtp++ = *cp++;
+ if (*cp == '-') /* left-adjusted field? */
+ *fmtp++ = *cp++;
+ if (*cp == '0') /* zero-padded field? */
+ *fmtp++ = *cp++;
+ if (*cp == '*') { /* dynamic field witdh */
+ sprintf(fmtp, "%d", va_arg(ap, int));
+ fmtp += strlen(fmtp);
+ cp++;
+ } else {
+ while (isdigit(*cp)) /* hard-coded field width */
+ *fmtp++ = *cp++;
+ }
+ if (*cp == '.') /* width/precision separator */
+ *fmtp++ = *cp++;
+ if (*cp == '*') { /* dynamic precision */
+ sprintf(fmtp, "%d", va_arg(ap, int));
+ fmtp += strlen(fmtp);
+ cp++;
+ } else {
+ while (isdigit(*cp)) /* hard-coded precision */
+ *fmtp++ = *cp++;
+ }
+ if (*cp == 'l') /* long whatever */
+ *fmtp++ = *cp++;
+ if (*cp == 0) /* premature end, punt */
+ break;
+ *fmtp++ = *cp; /* type (checked below) */
+ *fmtp = 0;
+
+ /* Execute the format string - let fprintf() do the hard work. */
+
+ switch (fmtp[-1]) {
+ case 's': /* string-valued argument */
+ count += fprintf(fp, fmt, va_arg(ap, char *));
+ break;
+ case 'c': /* integral-valued argument */
+ case 'd':
+ case 'u':
+ case 'o':
+ case 'x':
+ if (fmtp[-2] == 'l')
+ count += fprintf(fp, fmt, va_arg(ap, long));
+ else
+ count += fprintf(fp, fmt, va_arg(ap, int));
+ break;
+ case 'e': /* float-valued argument */
+ case 'f':
+ case 'g':
+ count += fprintf(fp, fmt, va_arg(ap, double));
+ break;
+ default: /* anything else */
+ putc(fmtp[-1], fp);
+ count++;
+ break;
+ }
+ }
+ }
+ return (count);
+}
+
+/* vprintf - print variable-length argument list to stdout */
+
+vprintf(format, ap)
+char *format;
+va_list ap;
+{
+ return (vfprintf(stdout, format, ap));
+}
diff --git a/contrib/tcp_wrappers/workarounds.c b/contrib/tcp_wrappers/workarounds.c
new file mode 100644
index 000000000000..9ffa247a90ba
--- /dev/null
+++ b/contrib/tcp_wrappers/workarounds.c
@@ -0,0 +1,308 @@
+ /*
+ * Workarounds for known system software bugs. This module provides wrappers
+ * around library functions and system calls that are known to have problems
+ * on some systems. Most of these workarounds won't do any harm on regular
+ * systems.
+ *
+ * Author: Wietse Venema, Eindhoven University of Technology, The Netherlands.
+ */
+
+#ifndef lint
+char sccsid[] = "@(#) workarounds.c 1.6 96/03/19 16:22:25";
+#endif
+
+#include <sys/types.h>
+#include <sys/param.h>
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <arpa/inet.h>
+#include <netdb.h>
+#include <errno.h>
+#include <stdio.h>
+#include <syslog.h>
+#include <string.h>
+
+extern int errno;
+
+#include "tcpd.h"
+
+ /*
+ * Some AIX versions advertise a too small MAXHOSTNAMELEN value (32).
+ * Result: long hostnames would be truncated, and connections would be
+ * dropped because of host name verification failures. Adrian van Bloois
+ * (A.vanBloois@info.nic.surfnet.nl) figured out what was the problem.
+ */
+
+#if (MAXHOSTNAMELEN < 64)
+#undef MAXHOSTNAMELEN
+#endif
+
+/* In case not defined in <sys/param.h>. */
+
+#ifndef MAXHOSTNAMELEN
+#define MAXHOSTNAMELEN 256 /* storage for host name */
+#endif
+
+ /*
+ * Some DG/UX inet_addr() versions return a struct/union instead of a long.
+ * You have this problem when the compiler complains about illegal lvalues
+ * or something like that. The following code fixes this mutant behaviour.
+ * It should not be enabled on "normal" systems.
+ *
+ * Bug reported by ben@piglet.cr.usgs.gov (Rev. Ben A. Mesander).
+ */
+
+#ifdef INET_ADDR_BUG
+
+#undef inet_addr
+
+long fix_inet_addr(string)
+char *string;
+{
+ return (inet_addr(string).s_addr);
+}
+
+#endif /* INET_ADDR_BUG */
+
+ /*
+ * With some System-V versions, the fgets() library function does not
+ * account for partial reads from e.g. sockets. The result is that fgets()
+ * gives up too soon, causing username lookups to fail. Problem first
+ * reported for IRIX 4.0.5, by Steve Kotsopoulos <steve@ecf.toronto.edu>.
+ * The following code works around the problem. It does no harm on "normal"
+ * systems.
+ */
+
+#ifdef BROKEN_FGETS
+
+#undef fgets
+
+char *fix_fgets(buf, len, fp)
+char *buf;
+int len;
+FILE *fp;
+{
+ char *cp = buf;
+ int c;
+
+ /*
+ * Copy until the buffer fills up, until EOF, or until a newline is
+ * found.
+ */
+ while (len > 1 && (c = getc(fp)) != EOF) {
+ len--;
+ *cp++ = c;
+ if (c == '\n')
+ break;
+ }
+
+ /*
+ * Return 0 if nothing was read. This is correct even when a silly buffer
+ * length was specified.
+ */
+ if (cp > buf) {
+ *cp = 0;
+ return (buf);
+ } else {
+ return (0);
+ }
+}
+
+#endif /* BROKEN_FGETS */
+
+ /*
+ * With early SunOS 5 versions, recvfrom() does not completely fill in the
+ * source address structure when doing a non-destructive read. The following
+ * code works around the problem. It does no harm on "normal" systems.
+ */
+
+#ifdef RECVFROM_BUG
+
+#undef recvfrom
+
+int fix_recvfrom(sock, buf, buflen, flags, from, fromlen)
+int sock;
+char *buf;
+int buflen;
+int flags;
+struct sockaddr *from;
+int *fromlen;
+{
+ int ret;
+
+ /* Assume that both ends of a socket belong to the same address family. */
+
+ if ((ret = recvfrom(sock, buf, buflen, flags, from, fromlen)) >= 0) {
+ if (from->sa_family == 0) {
+ struct sockaddr my_addr;
+ int my_addr_len = sizeof(my_addr);
+
+ if (getsockname(0, &my_addr, &my_addr_len)) {
+ tcpd_warn("getsockname: %m");
+ } else {
+ from->sa_family = my_addr.sa_family;
+ }
+ }
+ }
+ return (ret);
+}
+
+#endif /* RECVFROM_BUG */
+
+ /*
+ * The Apollo SR10.3 and some SYSV4 getpeername(2) versions do not return an
+ * error in case of a datagram-oriented socket. Instead, they claim that all
+ * UDP requests come from address 0.0.0.0. The following code works around
+ * the problem. It does no harm on "normal" systems.
+ */
+
+#ifdef GETPEERNAME_BUG
+
+#undef getpeername
+
+int fix_getpeername(sock, sa, len)
+int sock;
+struct sockaddr *sa;
+int *len;
+{
+ int ret;
+ struct sockaddr_in *sin = (struct sockaddr_in *) sa;
+
+ if ((ret = getpeername(sock, sa, len)) >= 0
+ && sa->sa_family == AF_INET
+ && sin->sin_addr.s_addr == 0) {
+ errno = ENOTCONN;
+ return (-1);
+ } else {
+ return (ret);
+ }
+}
+
+#endif /* GETPEERNAME_BUG */
+
+ /*
+ * According to Karl Vogel (vogelke@c-17igp.wpafb.af.mil) some Pyramid
+ * versions have no yp_default_domain() function. We use getdomainname()
+ * instead.
+ */
+
+#ifdef USE_GETDOMAIN
+
+int yp_get_default_domain(ptr)
+char **ptr;
+{
+ static char mydomain[MAXHOSTNAMELEN];
+
+ *ptr = mydomain;
+ return (getdomainname(mydomain, MAXHOSTNAMELEN));
+}
+
+#endif /* USE_GETDOMAIN */
+
+#ifndef INADDR_NONE
+#define INADDR_NONE 0xffffffff
+#endif
+
+ /*
+ * Solaris 2.4 gethostbyname() has problems with multihomed hosts. When
+ * doing DNS through NIS, only one host address ends up in the address list.
+ * All other addresses end up in the hostname alias list, interspersed with
+ * copies of the official host name. This would wreak havoc with tcpd's
+ * hostname double checks. Below is a workaround that should do no harm when
+ * accidentally left in. A side effect of the workaround is that address
+ * list members are no longer properly aligned for structure access.
+ */
+
+#ifdef SOLARIS_24_GETHOSTBYNAME_BUG
+
+#undef gethostbyname
+
+struct hostent *fix_gethostbyname(name)
+char *name;
+{
+ struct hostent *hp;
+ struct in_addr addr;
+ char **o_addr_list;
+ char **o_aliases;
+ char **n_addr_list;
+ int broken_gethostbyname = 0;
+
+ if ((hp = gethostbyname(name)) && !hp->h_addr_list[1] && hp->h_aliases[1]) {
+ for (o_aliases = n_addr_list = hp->h_aliases; *o_aliases; o_aliases++) {
+ if ((addr.s_addr = inet_addr(*o_aliases)) != INADDR_NONE) {
+ memcpy(*n_addr_list++, (char *) &addr, hp->h_length);
+ broken_gethostbyname = 1;
+ }
+ }
+ if (broken_gethostbyname) {
+ o_addr_list = hp->h_addr_list;
+ memcpy(*n_addr_list++, *o_addr_list, hp->h_length);
+ *n_addr_list = 0;
+ hp->h_addr_list = hp->h_aliases;
+ hp->h_aliases = o_addr_list + 1;
+ }
+ }
+ return (hp);
+}
+
+#endif /* SOLARIS_24_GETHOSTBYNAME_BUG */
+
+ /*
+ * Horror! Some FreeBSD 2.0 libc routines call strtok(). Since tcpd depends
+ * heavily on strtok(), strange things may happen. Workaround: use our
+ * private strtok(). This has been fixed in the meantime.
+ */
+
+#ifdef USE_STRSEP
+
+char *fix_strtok(buf, sep)
+char *buf;
+char *sep;
+{
+ static char *state;
+ char *result;
+
+ if (buf)
+ state = buf;
+ while ((result = strsep(&state, sep)) && result[0] == 0)
+ /* void */ ;
+ return (result);
+}
+
+#endif /* USE_STRSEP */
+
+ /*
+ * IRIX 5.3 (and possibly earlier versions, too) library routines call the
+ * non-reentrant strtok() library routine, causing hosts to slip through
+ * allow/deny filters. Workaround: don't rely on the vendor and use our own
+ * strtok() function. FreeBSD 2.0 has a similar problem (fixed in 2.0.5).
+ */
+
+#ifdef LIBC_CALLS_STRTOK
+
+char *my_strtok(buf, sep)
+char *buf;
+char *sep;
+{
+ static char *state;
+ char *result;
+
+ if (buf)
+ state = buf;
+
+ /*
+ * Skip over separator characters and detect end of string.
+ */
+ if (*(state += strspn(state, sep)) == 0)
+ return (0);
+
+ /*
+ * Skip over non-separator characters and terminate result.
+ */
+ result = state;
+ if (*(state += strcspn(state, sep)) != 0)
+ *state++ = 0;
+ return (result);
+}
+
+#endif /* LIBC_CALLS_STRTOK */