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-
-This is a distribution of both client and server telnet. These programs
-have been compiled on:
- telnet telnetd
- 4.4 BSD-Lite x x
- 4.3 BSD Reno X X
- UNICOS 9.1 X X
- UNICOS 9.0 X X
- UNICOS 8.0 X X
- BSDI 2.0 X X
- Solaris 2.4 x x (no linemode in server)
- SunOs 4.1.4 X X (no linemode in server)
- Ultrix 4.3 X X (no linemode in server)
- Ultrix 4.1 X X (no linemode in server)
-
-In addition, previous versions have been compiled on the following
-machines, but were not available for testing this version.
- telnet telnetd
- Next1.0 X X
- UNICOS 8.3 X X
- UNICOS 7.C X X
- UNICOS 7.0 X X
- SunOs 4.0.3c X X (no linemode in server)
- 4.3 BSD X X (no linemode in server)
- DYNIX V3.0.12 X X (no linemode in server)
- Ultrix 3.1 X X (no linemode in server)
- Ultrix 4.0 X X (no linemode in server)
- SunOs 3.5 X X (no linemode in server)
- SunOs 4.1.3 X X (no linemode in server)
- Solaris 2.2 x x (no linemode in server)
- Solaris 2.3 x x (no linemode in server)
- BSDI 1.0 X X
- BSDI 1.1 X X
- DYNIX V3.0.17.9 X X (no linemode in server)
- HP-UX 8.0 x x (no linemode in server)
-
-This code should work, but there are no guarantees.
-
-May 30, 1995
-
-This release represents what is on the 4.4BSD-Lite2 release, which
-should be the final BSD release. I will continue to support of
-telnet, The code (without encryption) is available via anonymous ftp
-from ftp.cray.com, in src/telnet/telnet.YY.MM.DD.NE.tar.Z, where
-YY.MM.DD is replaced with the year, month and day of the release.
-If you can't find it at one of these places, at some point in the
-near future information about the latest releases should be available
-from ftp.borman.com.
-
-In addition, the version with the encryption code is available via
-ftp from net-dist.mit.edu, in the directory /pub/telnet. There
-is a README file there that gives further information on how
-to get the distribution.
-
-Questions, comments, bug reports and bug fixes can be sent to
-one of these addresses:
- dab@borman.com
- dab@cray.com
- dab@bsdi.com
-
-This release is mainly bug fixes and code cleanup.
-
- Replace all calls to bcopy()/bzero() with calls to
- memmove()/memset() and all calls to index()/rindex()
- with calls to strchr()/strrchr().
-
- Add some missing diagnostics for option tracing
- to telnetd.
-
- Add support for BSDI 2.0 and Solaris 2.4.
-
- Add support for UNICOS 8.0
-
- Get rid of expanded tabs and trailing white spaces.
-
- From Paul Vixie:
- Fix for telnet going into an endless spin
- when the session dies abnormally.
-
- From Jef Poskanzer:
- Changes to allow telnet to compile
- under SunOS 3.5.
-
- From Philip Guenther:
- makeutx() doesn't expand utmpx,
- use pututxline() instead.
-
- From Chris Torek:
- Add a sleep(1) before execing login
- to avoid race condition that can eat
- up the login prompt.
- Use terminal speed directly if it is
- not an encoded value.
-
- From Steve Parker:
- Fix to realloc() call. Fix for execing
- login on solaris with no user name.
-
-January 19, 1994
-
-This is a list of some of the changes since the last tar release
-of telnet/telnetd. There are probably other changes that aren't
-listed here, but this should hit a lot of the main ones.
-
- General:
- Changed #define for AUTHENTICATE to AUTHENTICATION
- Changed #define for ENCRYPT to ENCRYPTION
- Changed #define for DES_ENCRYPT to DES_ENCRYPTION
-
- Added support for SPX authentication: -DSPX
-
- Added support for Kerberos Version 5 authentication: -DKRB5
-
- Added support for ANSI C function prototypes
-
- Added support for the NEW-ENVIRON option (RFC-1572)
- including support for USERVAR.
-
- Made support for the old Environment Option (RFC-1408)
- conditional on -DOLD_ENVIRON
-
- Added #define ENV_HACK - support for RFC 1571
-
- The encryption code is removed from the public distributions.
- Domestic 4.4 BSD distributions contain the encryption code.
-
- ENV_HACK: Code to deal with systems that only implement
- the old ENVIRON option, and have reversed definitions
- of ENV_VAR and ENV_VAL. Also fixes ENV processing in
- client to handle things besides just the default set...
-
- NO_BSD_SETJMP: UNICOS configuration for
- UNICOS 6.1/6.0/5.1/5.0 systems.
-
- STREAMSPTY: Use /dev/ptmx to get a clean pty. This
- is for SVr4 derivatives (Like Solaris)
-
- UTMPX: For systems that have /etc/utmpx. This is for
- SVr4 derivatives (Like Solaris)
-
- Definitions for BSDI 1.0
-
- Definitions for 4.3 Reno and 4.4 BSD.
-
- Definitions for UNICOS 8.0 and UNICOS 7.C
-
- Definitions for Solaris 2.0
-
- Definitions for HP-UX 8.0
-
- Latest Copyright notices from Berkeley.
-
- FLOW-CONTROL: support for RFC-XXXx
-
-
- Client Specific:
-
- Fix the "send" command to not send garbage...
-
- Fix status message for "skiprc"
-
- Make sure to send NAWS after telnet has been suspended
- or an external command has been run, if the window size
- has changed.
-
- sysV88 support.
-
- Server Specific:
-
- Support flowcontrol option in non-linemode servers.
-
- -k Server supports Kludge Linemode, but will default to
- either single character mode or real Linemode support.
- The user will have to explicitly ask to switch into
- kludge linemode. ("stty extproc", or escape back to
- to telnet and say "mode line".)
-
- -u Specify the length of the hostname field in the utmp
- file. Hostname longer than this length will be put
- into the utmp file in dotted decimal notation, rather
- than putting in a truncated hostname.
-
- -U Registered hosts only. If a reverse hostname lookup
- fails, the connection will be refused.
-
- -f/-F
- Allows forwarding of credentials for KRB5.
-
-Februrary 22, 1991:
-
- Features:
-
- This version of telnet/telnetd has support for both
- the AUTHENTICATION and ENCRYPTION options. The
- AUTHENTICATION option is fairly well defined, and
- an option number has been assigned to it. The
- ENCRYPTION option is still in a state of flux; an
- option number has been assigned to, but it is still
- subject to change. The code is provided in this release
- for experimental and testing purposes.
-
- The telnet "send" command can now be used to send
- do/dont/will/wont commands, with any telnet option
- name. The rules for when do/dont/will/wont are sent
- are still followed, so just because the user requests
- that one of these be sent doesn't mean that it will
- be sent...
-
- The telnet "getstatus" command no longer requires
- that option printing be enabled to see the response
- to the "DO STATUS" command.
-
- A -n flag has been added to telnetd to disable
- keepalives.
-
- A new telnet command, "auth" has been added (if
- AUTHENTICATE is defined). It has four sub-commands,
- "status", "disable", "enable" and "help".
-
- A new telnet command, "encrypt" has been added (if
- ENCRYPT is defined). It has many sub-commands:
- "enable", "type", "start", "stop", "input",
- "-input", "output", "-output", "status", and "help".
-
- The LOGOUT option is now supported by both telnet
- and telnetd, a new command, "logout", was added
- to support this.
-
- Several new toggle options were added:
- "autoencrypt", "autodecrypt", "autologin", "authdebug",
- "encdebug", "skiprc", "verbose_encrypt"
-
- An "rlogin" interface has been added. If the program
- is named "rlogin", or the "-r" flag is given, then
- an rlogin type of interface will be used.
- ~. Terminates the session
- ~<susp> Suspend the session
- ~^] Escape to telnet command mode
- ~~ Pass through the ~.
- BUG: If you type the rlogin escape character
- in the middle of a line while in rlogin
- mode, you cannot erase it or any characters
- before it. Hopefully this can be fixed
- in a future release...
-
- General changes:
-
- A "libtelnet.a" has now been created. This libraray
- contains code that is common to both telnet and
- telnetd. This is also where library routines that
- are needed, but are not in the standard C library,
- are placed.
-
- The makefiles have been re-done. All of the site
- specific configuration information has now been put
- into a single "Config.generic" file, in the top level
- directory. Changing this one file will take care of
- all three subdirectories. Also, to add a new/local
- definition, a "Config.local" file may be created
- at the top level; if that file exists, the subdirectories
- will use that file instead of "Config.generic".
-
- Many 1-2 line functions in commands.c have been
- removed, and just inserted in-line, or replaced
- with a macro.
-
- Bug Fixes:
-
- The non-termio code in both telnet and telnetd was
- setting/clearing CTLECH in the sg_flags word. This
- was incorrect, and has been changed to set/clear the
- LCTLECH bit in the local mode word.
-
- The SRCRT #define has been removed. If IP_OPTIONS
- and IPPROTO_IP are defined on the system, then the
- source route code is automatically enabled.
-
- The NO_GETTYTAB #define has been removed; there
- is a compatability routine that can be built into
- libtelnet to achive the same results.
-
- The server, telnetd, has been switched to use getopt()
- for parsing the argument list.
-
- The code for getting the input/output speeds via
- cfgetispeed()/cfgetospeed() was still not quite
- right in telnet. Posix says if the ispeed is 0,
- then it is really equal to the ospeed.
-
- The suboption processing code in telnet now has
- explicit checks to make sure that we received
- the entire suboption (telnetd was already doing this).
-
- The telnet code for processing the terminal type
- could cause a core dump if an existing connection
- was closed, and a new connection opened without
- exiting telnet.
-
- Telnetd was doing a TCSADRAIN when setting the new
- terminal settings; This is not good, because it means
- that the tcsetattr() will hang waiting for output to
- drain, and telnetd is the only one that will drain
- the output... The fix is to use TCSANOW which does
- not wait.
-
- Telnetd was improperly setting/clearing the ISTRIP
- flag in the c_lflag field, it should be using the
- c_iflag field.
-
- When the child process of telnetd was opening the
- slave side of the pty, it was re-setting the EXTPROC
- bit too early, and some of the other initialization
- code was wiping it out. This would cause telnetd
- to go out of linemode and into single character mode.
-
- One instance of leaving linemode in telnetd forgot
- to send a WILL ECHO to the client, the net result
- would be that the user would see double character
- echo.
-
- If the MODE was being changed several times very
- quickly, telnetd could get out of sync with the
- state changes and the returning acks; and wind up
- being left in the wrong state.
-
-September 14, 1990:
-
- Switch the client to use getopt() for parsing the
- argument list. The 4.3Reno getopt.c is included for
- systems that don't have getopt().
-
- Use the posix _POSIX_VDISABLE value for what value
- to use when disabling special characters. If this
- is undefined, it defaults to 0x3ff.
-
- For non-termio systems, TIOCSETP was being used to
- change the state of the terminal. This causes the
- input queue to be flushed, which we don't want. This
- is now changed to TIOCSETN.
-
- Take out the "#ifdef notdef" around the code in the
- server that generates a "sync" when the pty oputput
- is flushed. The potential problem is that some older
- telnet clients may go into an infinate loop when they
- receive a "sync", if so, the server can be compiled
- with "NO_URGENT" defined.
-
- Fix the client where it was setting/clearing the OPOST
- bit in the c_lflag field, not the c_oflag field.
-
- Fix the client where it was setting/clearing the ISTRIP
- bit in the c_lflag field, not the c_iflag field. (On
- 4.3Reno, this is the ECHOPRT bit in the c_lflag field.)
- The client also had its interpretation of WILL BINARY
- and DO BINARY reversed.
-
- Fix a bug in client that would cause a core dump when
- attempting to remove the last environment variable.
-
- In the client, there were a few places were switch()
- was being passed a character, and if it was a negative
- value, it could get sign extended, and not match
- the 8 bit case statements. The fix is to and the
- switch value with 0xff.
-
- Add a couple more printoption() calls in the client, I
- don't think there are any more places were a telnet
- command can be received and not printed out when
- "options" is on.
-
- A new flag has been added to the client, "-a". Currently,
- this just causes the USER name to be sent across, in
- the future this may be used to signify that automatic
- authentication is requested.
-
- The USER variable is now only sent by the client if
- the "-a" or "-l user" options are explicity used, or
- if the user explicitly asks for the "USER" environment
- variable to be exported. In the server, if it receives
- the "USER" environment variable, it won't print out the
- banner message, so that only "Password:" will be printed.
- This makes the symantics more like rlogin, and should be
- more familiar to the user. (People are not used to
- getting a banner message, and then getting just a
- "Password:" prompt.)
-
- Re-vamp the code for starting up the child login
- process. The code was getting ugly, and it was
- hard to tell what was really going on. What we
- do now is after the fork(), in the child:
- 1) make sure we have no controlling tty
- 2) open and initialize the tty
- 3) do a setsid()/setpgrp()
- 4) makes the tty our controlling tty.
- On some systems, #2 makes the tty our controlling
- tty, and #4 is a no-op. The parent process does
- a gets rid of any controlling tty after the child
- is fork()ed.
-
- Use the strdup() library routine in telnet, instead
- of the local savestr() routine. If you don't have
- strdup(), you need to define NO_STRDUP.
-
- Add support for ^T (SIGINFO/VSTATUS), found in the
- 4.3Reno distribution. This maps to the AYT character.
- You need a 4-line bugfix in the kernel to get this
- to work properly:
-
- > *** tty_pty.c.ORG Tue Sep 11 09:41:53 1990
- > --- tty_pty.c Tue Sep 11 17:48:03 1990
- > ***************
- > *** 609,613 ****
- > if ((tp->t_lflag&NOFLSH) == 0)
- > ttyflush(tp, FREAD|FWRITE);
- > ! pgsignal(tp->t_pgrp, *(unsigned int *)data);
- > return(0);
- > }
- > --- 609,616 ----
- > if ((tp->t_lflag&NOFLSH) == 0)
- > ttyflush(tp, FREAD|FWRITE);
- > ! pgsignal(tp->t_pgrp, *(unsigned int *)data, 1);
- > ! if ((*(unsigned int *)data == SIGINFO) &&
- > ! ((tp->t_lflag&NOKERNINFO) == 0))
- > ! ttyinfo(tp);
- > return(0);
- > }
-
- The client is now smarter when setting the telnet escape
- character; it only sets it to one of VEOL and VEOL2 if
- one of them is undefined, and the other one is not already
- defined to the telnet escape character.
-
- Handle TERMIOS systems that have seperate input and output
- line speed settings imbedded in the flags.
-
- Many other minor bug fixes.
-
-June 20, 1990:
- Re-organize makefiles and source tree. The telnet/Source
- directory is now gone, and all the source that was in
- telnet/Source is now just in the telnet directory.
-
- Seperate makefile for each system are now gone. There
- are two makefiles, Makefile and Makefile.generic.
- The "Makefile" has the definitions for the various
- system, and "Makefile.generic" does all the work.
- There is a variable called "WHAT" that is used to
- specify what to make. For example, in the telnet
- directory, you might say:
- make 4.4bsd WHAT=clean
- to clean out the directory.
-
- Add support for the ENVIRON and XDISPLOC options.
- In order for the server to work, login has to have
- the "-p" option to preserve environment variables.
-
- Add the SOFT_TAB and LIT_ECHO modes in the LINEMODE support.
-
- Add the "-l user" option to command line and open command
- (This is passed through the ENVIRON option).
-
- Add the "-e" command line option, for setting the escape
- character.
-
- Add the "-D", diagnostic, option to the server. This allows
- the server to print out debug information, which is very
- useful when trying to debug a telnet that doesn't have any
- debugging ability.
-
- Turn off the literal next character when not in LINEMODE.
-
- Don't recognize ^Y locally, just pass it through.
-
- Make minor modifications for Sun4.0 and Sun4.1
-
- Add support for both FORW1 and FORW2 characters. The
- telnet escpape character is set to whichever of the
- two is not being used. If both are in use, the escape
- character is not set, so when in linemode the user will
- have to follow the escape character with a <CR> or <EOF)
- to get it passed through.
-
- Commands can now be put in single and double quotes, and
- a backslash is now an escape character. This is needed
- for allowing arbitrary strings to be assigned to environment
- variables.
-
- Switch telnetd to use macros like telnet for keeping
- track of the state of all the options.
-
- Fix telnetd's processing of options so that we always do
- the right processing of the LINEMODE option, regardless
- of who initiates the request to turn it on. Also, make
- sure that if the other side went "WILL ECHO" in response
- to our "DO ECHO", that we send a "DONT ECHO" to get the
- option turned back off!
-
- Fix the TERMIOS setting of the terminal speed to handle both
- BSD's seperate fields, and the SYSV method of CBAUD bits.
-
- Change how we deal with the other side refusing to enable
- an option. The sequence used to be: send DO option; receive
- WONT option; send DONT option. Now, the sequence is: send
- DO option; receive WONT option. Both should be valid
- according to the spec, but there has been at least one
- client implementation of telnet identified that can get
- really confused by this. (The exact sequence, from a trace
- on the server side, is (numbers are number of responses that
- we expect to get after that line...):
-
- send WILL ECHO 1 (initial request)
- send WONT ECHO 2 (server is changing state)
- recv DO ECHO 1 (first reply, ok. expect DONT ECHO next)
- send WILL ECHO 2 (server changes state again)
- recv DONT ECHO 1 (second reply, ok. expect DO ECHO next)
- recv DONT ECHO 0 (third reply, wrong answer. got DONT!!!)
- *** send WONT ECHO (send WONT to acknowledge the DONT)
- send WILL ECHO 1 (ask again to enable option)
- recv DO ECHO 0
-
- recv DONT ECHO 0
- send WONT ECHO 1
- recv DONT ECHO 0
- recv DO ECHO 1
- send WILL ECHO 0
- (and the last 5 lines loop forever)
-
- The line with the "***" is last of the WILL/DONT/WONT sequence.
- The change to the server to not generate that makes this same
- example become:
-
- send will ECHO 1
- send wont ECHO 2
- recv do ECHO 1
- send will ECHO 2
- recv dont ECHO 1
- recv dont ECHO 0
- recv do ECHO 1
- send will ECHO 0
-
- There is other option negotiation going on, and not sending
- the third part changes some of the timings, but this specific
- example no longer gets stuck in a loop. The "telnet.state"
- file has been modified to reflect this change to the algorithm.
-
- A bunch of miscellaneous bug fixes and changes to make
- lint happier.
-
- This version of telnet also has some KERBEROS stuff in
- it. This has not been tested, it uses an un-authorized
- telnet option number, and uses an out-of-date version
- of the (still being defined) AUTHENTICATION option.
- There is no support for this code, do not enable it.
-
-
-March 1, 1990:
-CHANGES/BUGFIXES SINCE LAST RELEASE:
- Some support for IP TOS has been added. Requires that the
- kernel support the IP_TOS socket option (currently this
- is only in UNICOS 6.0).
-
- Both telnet and telnetd now use the cc_t typedef. typedefs are
- included for systems that don't have it (in termios.h).
-
- SLC_SUSP was not supported properly before. It is now.
-
- IAC EOF was not translated properly in telnetd for SYSV_TERMIO
- when not in linemode. It now saves a copy of the VEOF character,
- so that when ICANON is turned off and we can't trust it anymore
- (because it is now the VMIN character) we use the saved value.
-
- There were two missing "break" commands in the linemode
- processing code in telnetd.
-
- Telnetd wasn't setting the kernel window size information
- properly. It was using the rows for both rows and columns...
-
-Questions/comments go to
- David Borman
- Cray Research, Inc.
- 655F Lone Oak Drive
- Eagan, MN 55123
- dab@cray.com.
-
-README: You are reading it.
-
-Config.generic:
- This file contains all the OS specific definitions. It
- has pre-definitions for many common system types, and is
- in standard makefile fromat. See the comments at the top
- of the file for more information.
-
-Config.local:
- This is not part of the distribution, but if this file exists,
- it is used instead of "Config.generic". This allows site
- specific configuration without having to modify the distributed
- "Config.generic" file.
-
-kern.diff:
- This file contains the diffs for the changes needed for the
- kernel to support LINEMODE is the server. These changes are
- for a 4.3BSD system. You may need to make some changes for
- your particular system.
-
- There is a new bit in the terminal state word, TS_EXTPROC.
- When this bit is set, several aspects of the terminal driver
- are disabled. Input line editing, character echo, and
- mapping of signals are all disabled. This allows the telnetd
- to turn of these functions when in linemode, but still keep
- track of what state the user wants the terminal to be in.
-
- New ioctl()s:
-
- TIOCEXT Turn on/off the TS_EXTPROC bit
- TIOCGSTATE Get t_state of tty to look at TS_EXTPROC bit
- TIOCSIG Generate a signal to processes in the
- current process group of the pty.
-
- There is a new mode for packet driver, the TIOCPKT_IOCTL bit.
- When packet mode is turned on in the pty, and the TS_EXTPROC
- bit is set, then whenever the state of the pty is changed, the
- next read on the master side of the pty will have the TIOCPKT_IOCTL
- bit set, and the data will contain the following:
- struct xx {
- struct sgttyb a;
- struct tchars b;
- struct ltchars c;
- int t_state;
- int t_flags;
- }
- This allows the process on the server side of the pty to know
- when the state of the terminal has changed, and what the new
- state is.
-
- However, if you define USE_TERMIO or SYSV_TERMIO, the code will
- expect that the structure returned in the TIOCPKT_IOCTL is
- the termio/termios structure.
-
-stty.diff:
- This file contains the changes needed for the stty(1) program
- to report on the current status of the TS_EXTPROC bit. It also
- allows the user to turn on/off the TS_EXTPROC bit. This is useful
- because it allows the user to say "stty -extproc", and the
- LINEMODE option will be automatically disabled, and saying "stty
- extproc" will re-enable the LINEMODE option.
-
-telnet.state:
- Both the client and server have code in them to deal
- with option negotiation loops. The algorithm that is
- used is described in this file.
-
-telnet:
- This directory contains the client code. No kernel changes are
- needed to use this code.
-
-telnetd:
- This directory contains the server code. If LINEMODE or KLUDGELINEMODE
- are defined, then the kernel modifications listed above are needed.
-
-libtelnet:
- This directory contains code that is common to both the client
- and the server.
-
-arpa:
- This directory has a new <arpa/telnet.h>
-
-libtelnet/Makefile.4.4:
-telnet/Makefile.4.4:
-telnetd/Makefile.4.4:
- These are the makefiles that can be used on a 4.3Reno
- system when this software is installed in /usr/src/lib/libtelnet,
- /usr/src/libexec/telnetd, and /usr/src/usr.bin/telnet.
-
-
-The following TELNET options are supported:
-
- LINEMODE:
- The LINEMODE option is supported as per RFC1116. The
- FORWARDMASK option is not currently supported.
-
- BINARY: The client has the ability to turn on/off the BINARY
- option in each direction. Turning on BINARY from
- server to client causes the LITOUT bit to get set in
- the terminal driver on both ends, turning on BINARY
- from the client to the server causes the PASS8 bit
- to get set in the terminal driver on both ends.
-
- TERMINAL-TYPE:
- This is supported as per RFC1091. On the server side,
- when a terminal type is received, termcap/terminfo
- is consulted to determine if it is a known terminal
- type. It keeps requesting terminal types until it
- gets one that it recongnizes, or hits the end of the
- list. The server side looks up the entry in the
- termcap/terminfo data base, and generates a list of
- names which it then passes one at a time to each
- request for a terminal type, duplicating the last
- entry in the list before cycling back to the beginning.
-
- NAWS: The Negotiate about Window Size, as per RFC 1073.
-
- TERMINAL-SPEED:
- Implemented as per RFC 1079
-
- TOGGLE-FLOW-CONTROL:
- Implemented as per RFC 1080
-
- TIMING-MARK:
- As per RFC 860
-
- SGA: As per RFC 858
-
- ECHO: As per RFC 857
-
- LOGOUT: As per RFC 727
-
- STATUS:
- The server will send its current status upon
- request. It does not ask for the clients status.
- The client will request the servers current status
- from the "send getstatus" command.
-
- ENVIRON:
- This option is currently being defined by the IETF
- Telnet Working Group, and an RFC has not yet been
- issued, but should be in the near future...
-
- X-DISPLAY-LOCATION:
- This functionality can be done through the ENVIRON
- option, it is added here for completeness.
-
- AUTHENTICATION:
- This option is currently being defined by the IETF
- Telnet Working Group, and an RFC has not yet been
- issued. The basic framework is pretty much decided,
- but the definitions for the specific authentication
- schemes is still in a state of flux.
-
- ENCRYPTION:
- This option is currently being defined by the IETF
- Telnet Working Group, and an RFC has not yet been
- issued. The draft RFC is still in a state of flux,
- so this code may change in the future.