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authorYoshinobu Inoue <shin@FreeBSD.org>1999-12-28 02:37:14 +0000
committerYoshinobu Inoue <shin@FreeBSD.org>1999-12-28 02:37:14 +0000
commit7d56d3747c94bb6889973c7449a57e83cc943d39 (patch)
treecd915697a1aaa5b333863b336bd5f4e0e9c24e85 /lib/libc/net/name6.c
parented63a7aaef029dd4831541f0103619792e883d6f (diff)
downloadsrc-7d56d3747c94bb6889973c7449a57e83cc943d39.tar.gz
src-7d56d3747c94bb6889973c7449a57e83cc943d39.zip
Getaddrinfo(), getnameinfo(), and etc support in libc/net.
Several udp and raw apps IPv6 support. Reviewed by: freebsd-arch, cvs-committers Obtained from: KAME project
Notes
Notes: svn path=/head/; revision=55163
Diffstat (limited to 'lib/libc/net/name6.c')
-rw-r--r--lib/libc/net/name6.c1260
1 files changed, 1260 insertions, 0 deletions
diff --git a/lib/libc/net/name6.c b/lib/libc/net/name6.c
new file mode 100644
index 000000000000..668345149c9e
--- /dev/null
+++ b/lib/libc/net/name6.c
@@ -0,0 +1,1260 @@
+/*
+ * Copyright (C) 1995, 1996, 1997, 1998, and 1999 WIDE Project.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of the project nor the names of its contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * $FreeBSD$
+ */
+/* $Id: name6.c,v 1.9 1999/10/29 03:04:26 itojun Exp $ */
+/*
+ * Atsushi Onoe <onoe@sm.sony.co.jp>
+ */
+
+/*
+ * TODO for thread safe
+ * use mutex for _hostconf, _hostconf_init.
+ * rewrite resolvers to be thread safe
+ */
+
+#include <sys/param.h>
+#include <sys/socket.h>
+#include <sys/time.h>
+#include <netinet/in.h>
+
+#include <arpa/inet.h>
+#include <arpa/nameser.h>
+
+#include <netdb.h>
+#include <resolv.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+#ifndef _PATH_HOSTS
+#define _PATH_HOSTS "/etc/hosts"
+#endif
+
+#ifndef MAXALIASES
+#define MAXALIASES 10
+#endif
+#ifndef MAXADDRS
+#define MAXADDRS 20
+#endif
+#ifndef MAXDNAME
+#define MAXDNAME 1025
+#endif
+
+#ifdef INET6
+#define ADDRLEN(af) ((af) == AF_INET6 ? sizeof(struct in6_addr) : \
+ sizeof(struct in_addr))
+#else
+#define ADDRLEN(af) sizeof(struct in_addr)
+#endif
+
+#define MAPADDR(ab, ina) \
+do { \
+ memcpy(&(ab)->map_inaddr, ina, sizeof(struct in_addr)); \
+ memset((ab)->map_zero, 0, sizeof((ab)->map_zero)); \
+ memset((ab)->map_one, 0xff, sizeof((ab)->map_one)); \
+} while (0)
+#define MAPADDRENABLED(flags) \
+ (((flags) & AI_V4MAPPED) || \
+ (((flags) & AI_V4MAPPED_CFG) && _mapped_addr_enabled()))
+
+union inx_addr {
+ struct in_addr in_addr;
+#ifdef INET6
+ struct in6_addr in6_addr;
+#endif
+ struct {
+ u_char mau_zero[10];
+ u_char mau_one[2];
+ struct in_addr mau_inaddr;
+ } map_addr_un;
+#define map_zero map_addr_un.mau_zero
+#define map_one map_addr_un.mau_one
+#define map_inaddr map_addr_un.mau_inaddr
+};
+
+static struct hostent *_hpcopy(struct hostent *hp, int *errp);
+static struct hostent *_hpaddr(int af, const char *name, void *addr, int *errp);
+static struct hostent *_hpmerge(struct hostent *hp1, struct hostent *hp2, int *errp);
+#ifdef INET6
+static struct hostent *_hpmapv6(struct hostent *hp, int *errp);
+#endif
+static struct hostent *_hpsort(struct hostent *hp);
+static struct hostent *_ghbyname(const char *name, int af, int flags, int *errp);
+static char *_hgetword(char **pp);
+static int _mapped_addr_enabled(void);
+
+static FILE *_files_open(int *errp);
+static struct hostent *_files_ghbyname(const char *name, int af, int *errp);
+static struct hostent *_files_ghbyaddr(const void *addr, int addrlen, int af, int *errp);
+static void _files_shent(int stayopen);
+static void _files_ehent(void);
+static struct hostent *_dns_ghbyname(const char *name, int af, int *errp);
+static struct hostent *_dns_ghbyaddr(const void *addr, int addrlen, int af, int *errp);
+static void _dns_shent(int stayopen);
+static void _dns_ehent(void);
+#ifdef ICMPNL
+static struct hostent *_icmp_ghbyaddr(const void *addr, int addrlen, int af, int *errp);
+#endif /* ICMPNL */
+
+/*
+ * Select order host function.
+ */
+#define MAXHOSTCONF 4
+
+#ifndef HOSTCONF
+# define HOSTCONF "/etc/host.conf"
+#endif /* !HOSTCONF */
+
+struct _hostconf {
+ struct hostent *(*byname)(const char *name, int af, int *errp);
+ struct hostent *(*byaddr)(const void *addr, int addrlen, int af, int *errp);
+};
+
+/* default order */
+static struct _hostconf _hostconf[MAXHOSTCONF] = {
+ { _dns_ghbyname, _dns_ghbyaddr },
+ { _files_ghbyname, _files_ghbyaddr },
+#ifdef ICMPNL
+ { NULL, _icmp_ghbyaddr },
+#endif /* ICMPNL */
+};
+
+static int _hostconf_init_done;
+static void _hostconf_init(void);
+
+/*
+ * Initialize hostconf structure.
+ */
+
+static void
+_hostconf_init(void)
+{
+ FILE *fp;
+ int n;
+ char *p, *line;
+ char buf[BUFSIZ];
+
+ _hostconf_init_done = 1;
+ n = 0;
+ p = HOSTCONF;
+ if ((fp = fopen(p, "r")) == NULL)
+ return;
+ while (n < MAXHOSTCONF && fgets(buf, sizeof(buf), fp)) {
+ line = buf;
+ if ((p = _hgetword(&line)) == NULL)
+ continue;
+ do {
+ if (strcmp(p, "hosts") == 0
+ || strcmp(p, "local") == 0
+ || strcmp(p, "file") == 0
+ || strcmp(p, "files") == 0) {
+ _hostconf[n].byname = _files_ghbyname;
+ _hostconf[n].byaddr = _files_ghbyaddr;
+ n++;
+ }
+ else if (strcmp(p, "dns") == 0
+ || strcmp(p, "bind") == 0) {
+ _hostconf[n].byname = _dns_ghbyname;
+ _hostconf[n].byaddr = _dns_ghbyaddr;
+ n++;
+ }
+#ifdef ICMPNL
+ else if (strcmp(p, "icmp") == 0) {
+ _hostconf[n].byname = NULL;
+ _hostconf[n].byaddr = _icmp_ghbyaddr;
+ n++;
+ }
+#endif /* ICMPNL */
+ } while ((p = _hgetword(&line)) != NULL);
+ }
+ fclose(fp);
+ if (n < 0) {
+ /* no keyword found. do not change default configuration */
+ return;
+ }
+ for (; n < MAXHOSTCONF; n++) {
+ _hostconf[n].byname = NULL;
+ _hostconf[n].byaddr = NULL;
+ }
+}
+
+/*
+ * Check if kernel supports mapped address.
+ * implementation dependent
+ */
+#ifdef __KAME__
+#include <sys/sysctl.h>
+#endif /* __KAME__ */
+
+static int
+_mapped_addr_enabled(void)
+{
+ /* implementation dependent check */
+#if defined(__KAME__) && defined(IPV6CTL_MAPPED_ADDR)
+ int mib[4];
+ size_t len;
+ int val;
+
+ mib[0] = CTL_NET;
+ mib[1] = PF_INET6;
+ mib[2] = IPPROTO_IPV6;
+ mib[3] = IPV6CTL_MAPPED_ADDR;
+ len = sizeof(val);
+ if (sysctl(mib, 4, &val, &len, 0, 0) == 0 && val != 0)
+ return 1;
+#endif /* __KAME__ && IPV6CTL_MAPPED_ADDR */
+ return 0;
+}
+
+/*
+ * Functions defined in RFC2553
+ * getipnodebyname, getipnodebyadr, freehostent
+ */
+
+static struct hostent *
+_ghbyname(const char *name, int af, int flags, int *errp)
+{
+ struct hostent *hp;
+ int i;
+
+ if (flags & AI_ADDRCONFIG) {
+ int s;
+
+ if ((s = socket(af, SOCK_DGRAM, 0)) < 0)
+ return NULL;
+ /*
+ * TODO:
+ * Note that implementation dependent test for address
+ * configuration should be done everytime called
+ * (or apropriate interval),
+ * because addresses will be dynamically assigned or deleted.
+ */
+ close(s);
+ }
+
+ for (i = 0; i < MAXHOSTCONF; i++) {
+ if (_hostconf[i].byname
+ && (hp = (*_hostconf[i].byname)(name, af, errp))
+ != NULL)
+ return hp;
+ }
+
+ return NULL;
+}
+
+struct hostent *
+getipnodebyname(const char *name, int af, int flags, int *errp)
+{
+ struct hostent *hp;
+ union inx_addr addrbuf;
+
+ if (af != AF_INET
+#ifdef INET6
+ && af != AF_INET6
+#endif
+ )
+ {
+ *errp = NO_RECOVERY;
+ return NULL;
+ }
+
+#ifdef INET6
+ /* special case for literal address */
+ if (inet_pton(AF_INET6, name, &addrbuf) == 1) {
+ if (af != AF_INET6) {
+ *errp = HOST_NOT_FOUND;
+ return NULL;
+ }
+ return _hpaddr(af, name, &addrbuf, errp);
+ }
+#endif
+ if (inet_pton(AF_INET, name, &addrbuf) == 1) {
+ if (af != AF_INET) {
+ if (MAPADDRENABLED(flags)) {
+ MAPADDR(&addrbuf, &addrbuf.in_addr);
+ } else {
+ *errp = HOST_NOT_FOUND;
+ return NULL;
+ }
+ }
+ return _hpaddr(af, name, &addrbuf, errp);
+ }
+
+ if (!_hostconf_init_done)
+ _hostconf_init();
+
+ *errp = HOST_NOT_FOUND;
+ hp = _ghbyname(name, af, flags, errp);
+
+#ifdef INET6
+ if (af == AF_INET6
+ && ((flags & AI_ALL) || hp == NULL)
+ && (MAPADDRENABLED(flags))) {
+ struct hostent *hp2 = _ghbyname(name, AF_INET, flags, errp);
+ if (hp == NULL)
+ hp = _hpmapv6(hp2, errp);
+ else {
+ if (hp2 && strcmp(hp->h_name, hp2->h_name) != 0) {
+ freehostent(hp2);
+ hp2 = NULL;
+ }
+ hp = _hpmerge(hp, hp2, errp);
+ }
+ }
+#endif
+ return _hpsort(hp);
+}
+
+struct hostent *
+getipnodebyaddr(const void *src, size_t len, int af, int *errp)
+{
+ struct hostent *hp;
+ int i;
+#ifdef INET6
+ struct in6_addr addrbuf;
+#else
+ struct in_addr addrbuf;
+#endif
+
+ *errp = HOST_NOT_FOUND;
+
+ switch (af) {
+ case AF_INET:
+ if (len != sizeof(struct in_addr)) {
+ *errp = NO_RECOVERY;
+ return NULL;
+ }
+ if ((long)src & ~(sizeof(struct in_addr) - 1)) {
+ memcpy(&addrbuf, src, len);
+ src = &addrbuf;
+ }
+ if (((struct in_addr *)src)->s_addr == 0)
+ return NULL;
+ break;
+#ifdef INET6
+ case AF_INET6:
+ if (len != sizeof(struct in6_addr)) {
+ *errp = NO_RECOVERY;
+ return NULL;
+ }
+ if ((long)src & ~(sizeof(struct in6_addr) / 2 - 1)) { /*XXX*/
+ memcpy(&addrbuf, src, len);
+ src = &addrbuf;
+ }
+ if (IN6_IS_ADDR_V4MAPPED((struct in6_addr *)src)
+ || IN6_IS_ADDR_V4COMPAT((struct in6_addr *)src)) {
+ src = (char *)src +
+ (sizeof(struct in6_addr) - sizeof(struct in_addr));
+ af = AF_INET;
+ len = sizeof(struct in_addr);
+ }
+ break;
+#endif
+ default:
+ *errp = NO_RECOVERY;
+ return NULL;
+ }
+
+ if (!_hostconf_init_done)
+ _hostconf_init();
+ for (i = 0; i < MAXHOSTCONF; i++) {
+ if (_hostconf[i].byaddr
+ && (hp = (*_hostconf[i].byaddr)(src, len, af, errp)) != NULL)
+ return hp;
+ }
+
+ return NULL;
+}
+
+void
+freehostent(struct hostent *ptr)
+{
+ free(ptr);
+}
+
+#if 0
+
+/* XXX: should be deprecated */
+struct hostent *
+getnodebyname(const char *name, int af, int flags)
+{
+ return getipnodebyname(name, af, flags, &h_errno);
+}
+
+#ifdef __warn_references
+__warn_references(getnodebyname,
+ "warning: getnodebyname() deprecated, "
+ "should use getaddrinfo() or getipnodebyname()");
+#endif
+
+struct hostent *
+getnodebyaddr(const void *src, size_t len, int af)
+{
+ return getipnodebyaddr(src, len, af, &h_errno);
+}
+
+#ifdef __warn_references
+__warn_references(getnodebyaddr,
+ "warning: getnodebyaddr() deprecated, "
+ "should use getnameinfo() or getipnodebyaddr()");
+#endif
+
+#endif
+
+/*
+ * Private utility functions
+ */
+
+/*
+ * _hpcopy: allocate and copy hostent structure
+ */
+static struct hostent *
+_hpcopy(struct hostent *hp, int *errp)
+{
+ struct hostent *nhp;
+ char *cp, **pp;
+ int size, addrsize;
+ int nalias = 0, naddr = 0;
+ int al_off;
+ int i;
+
+ if (hp == NULL)
+ return hp;
+
+ /* count size to be allocated */
+ size = sizeof(struct hostent);
+ if (hp->h_name != NULL && *hp->h_name != '\0')
+ size += strlen(hp->h_name) + 1;
+ if ((pp = hp->h_aliases) != NULL) {
+ for (i = 0; *pp != NULL; i++, pp++) {
+ if (**pp != '\0') {
+ size += strlen(*pp) + 1;
+ nalias++;
+ }
+ }
+ }
+ /* adjust alignment */
+ size = ALIGN(size);
+ al_off = size;
+ size += sizeof(char *) * (nalias + 1);
+ addrsize = ALIGN(hp->h_length);
+ if ((pp = hp->h_addr_list) != NULL) {
+ while (*pp++ != NULL)
+ naddr++;
+ }
+ size += addrsize * naddr;
+ size += sizeof(char *) * (naddr + 1);
+
+ /* copy */
+ if ((nhp = (struct hostent *)malloc(size)) == NULL) {
+ *errp = TRY_AGAIN;
+ return NULL;
+ }
+ cp = (char *)&nhp[1];
+ if (hp->h_name != NULL && *hp->h_name != '\0') {
+ nhp->h_name = cp;
+ strcpy(cp, hp->h_name);
+ cp += strlen(cp) + 1;
+ } else
+ nhp->h_name = NULL;
+ nhp->h_aliases = (char **)((char *)nhp + al_off);
+ if ((pp = hp->h_aliases) != NULL) {
+ for (i = 0; *pp != NULL; pp++) {
+ if (**pp != '\0') {
+ nhp->h_aliases[i++] = cp;
+ strcpy(cp, *pp);
+ cp += strlen(cp) + 1;
+ }
+ }
+ }
+ nhp->h_aliases[nalias] = NULL;
+ cp = (char *)&nhp->h_aliases[nalias + 1];
+ nhp->h_addrtype = hp->h_addrtype;
+ nhp->h_length = hp->h_length;
+ nhp->h_addr_list = (char **)cp;
+ if ((pp = hp->h_addr_list) != NULL) {
+ cp = (char *)&nhp->h_addr_list[naddr + 1];
+ for (i = 0; *pp != NULL; pp++) {
+ nhp->h_addr_list[i++] = cp;
+ memcpy(cp, *pp, hp->h_length);
+ cp += addrsize;
+ }
+ }
+ nhp->h_addr_list[naddr] = NULL;
+ return nhp;
+}
+
+/*
+ * _hpaddr: construct hostent structure with one address
+ */
+static struct hostent *
+_hpaddr(int af, const char *name, void *addr, int *errp)
+{
+ struct hostent *hp, hpbuf;
+ char *addrs[2];
+
+ hp = &hpbuf;
+ hp->h_name = (char *)name;
+ hp->h_aliases = NULL;
+ hp->h_addrtype = af;
+ hp->h_length = ADDRLEN(af);
+ hp->h_addr_list = addrs;
+ addrs[0] = (char *)addr;
+ addrs[1] = NULL;
+ return _hpcopy(hp, errp);
+}
+
+/*
+ * _hpmerge: merge 2 hostent structure, arguments will be freed
+ */
+static struct hostent *
+_hpmerge(struct hostent *hp1, struct hostent *hp2, int *errp)
+{
+ int i, j;
+ int naddr, nalias;
+ char **pp;
+ struct hostent *hp, hpbuf;
+ char *aliases[MAXALIASES + 1], *addrs[MAXADDRS + 1];
+ union inx_addr addrbuf[MAXADDRS];
+
+ if (hp1 == NULL)
+ return hp2;
+ if (hp2 == NULL)
+ return hp1;
+
+#define HP(i) (i == 1 ? hp1 : hp2)
+ hp = &hpbuf;
+ hp->h_name = (hp1->h_name != NULL ? hp1->h_name : hp2->h_name);
+ hp->h_aliases = aliases;
+ nalias = 0;
+ for (i = 1; i <= 2; i++) {
+ if ((pp = HP(i)->h_aliases) == NULL)
+ continue;
+ for (; nalias < MAXALIASES && *pp != NULL; pp++) {
+ /* check duplicates */
+ for (j = 0; j < nalias; j++)
+ if (strcasecmp(*pp, aliases[j]) == 0)
+ break;
+ if (j == nalias)
+ aliases[nalias++] = *pp;
+ }
+ }
+ aliases[nalias] = NULL;
+#ifdef INET6
+ if (hp1->h_length != hp2->h_length) {
+ hp->h_addrtype = AF_INET6;
+ hp->h_length = sizeof(struct in6_addr);
+ } else {
+#endif
+ hp->h_addrtype = hp1->h_addrtype;
+ hp->h_length = hp1->h_length;
+#ifdef INET6
+ }
+#endif
+ hp->h_addr_list = addrs;
+ naddr = 0;
+ for (i = 1; i <= 2; i++) {
+ if ((pp = HP(i)->h_addr_list) == NULL)
+ continue;
+ if (HP(i)->h_length == hp->h_length) {
+ while (naddr < MAXADDRS && *pp != NULL)
+ addrs[naddr++] = *pp++;
+ } else {
+ /* copy IPv4 addr as mapped IPv6 addr */
+ while (naddr < MAXADDRS && *pp != NULL) {
+ MAPADDR(&addrbuf[naddr], *pp++);
+ addrs[naddr] = (char *)&addrbuf[naddr];
+ naddr++;
+ }
+ }
+ }
+ addrs[naddr] = NULL;
+ hp = _hpcopy(hp, errp);
+ freehostent(hp1);
+ freehostent(hp2);
+ return hp;
+}
+
+/*
+ * _hpmapv6: convert IPv4 hostent into IPv4-mapped IPv6 addresses
+ */
+#ifdef INET6
+static struct hostent *
+_hpmapv6(struct hostent *hp, int *errp)
+{
+ struct hostent *hp6;
+
+ if (hp == NULL)
+ return NULL;
+ if (hp->h_addrtype == AF_INET6)
+ return hp;
+
+ /* make dummy hostent to convert IPv6 address */
+ if ((hp6 = (struct hostent *)malloc(sizeof(struct hostent))) == NULL) {
+ *errp = TRY_AGAIN;
+ return NULL;
+ }
+ hp6->h_name = NULL;
+ hp6->h_aliases = NULL;
+ hp6->h_addrtype = AF_INET6;
+ hp6->h_length = sizeof(struct in6_addr);
+ hp6->h_addr_list = NULL;
+ return _hpmerge(hp6, hp, errp);
+}
+#endif
+
+/*
+ * _hpsort: sort address by sortlist
+ */
+static struct hostent *
+_hpsort(struct hostent *hp)
+{
+ int i, j, n;
+ u_char *ap, *sp, *mp, **pp;
+ char t;
+ char order[MAXADDRS];
+ int nsort = _res.nsort;
+
+ if (hp == NULL || hp->h_addr_list[1] == NULL || nsort == 0)
+ return hp;
+ for (i = 0; (ap = (u_char *)hp->h_addr_list[i]); i++) {
+ for (j = 0; j < nsort; j++) {
+#ifdef INET6
+ if (_res_ext.sort_list[j].af != hp->h_addrtype)
+ continue;
+ sp = (u_char *)&_res_ext.sort_list[j].addr;
+ mp = (u_char *)&_res_ext.sort_list[j].mask;
+#else
+ sp = (u_char *)&_res.sort_list[j].addr;
+ mp = (u_char *)&_res.sort_list[j].mask;
+#endif
+ for (n = 0; n < hp->h_length; n++) {
+ if ((ap[n] & mp[n]) != sp[n])
+ break;
+ }
+ if (n == hp->h_length)
+ break;
+ }
+ order[i] = j;
+ }
+ n = i;
+ pp = (u_char **)hp->h_addr_list;
+ for (i = 0; i < n - 1; i++) {
+ for (j = i + 1; j < n; j++) {
+ if (order[i] > order[j]) {
+ ap = pp[i];
+ pp[i] = pp[j];
+ pp[j] = ap;
+ t = order[i];
+ order[i] = order[j];
+ order[j] = t;
+ }
+ }
+ }
+ return hp;
+}
+
+static char *
+_hgetword(char **pp)
+{
+ char c, *p, *ret;
+ const char *sp;
+ static const char sep[] = "# \t\n";
+
+ ret = NULL;
+ for (p = *pp; (c = *p) != '\0'; p++) {
+ for (sp = sep; *sp != '\0'; sp++) {
+ if (c == *sp)
+ break;
+ }
+ if (c == '#')
+ p[1] = '\0'; /* ignore rest of line */
+ if (ret == NULL) {
+ if (*sp == '\0')
+ ret = p;
+ } else {
+ if (*sp != '\0') {
+ *p++ = '\0';
+ break;
+ }
+ }
+ }
+ *pp = p;
+ if (ret == NULL || *ret == '\0')
+ return NULL;
+ return ret;
+}
+
+/*
+ * FILES (/etc/hosts)
+ */
+
+static FILE *
+_files_open(int *errp)
+{
+ FILE *fp;
+ fp = fopen(_PATH_HOSTS, "r");
+ if (fp == NULL)
+ *errp = NO_RECOVERY;
+ return fp;
+}
+
+static struct hostent *
+_files_ghbyname(const char *name, int af, int *errp)
+{
+ int match, nalias;
+ char *p, *line, *addrstr, *cname;
+ FILE *fp;
+ struct hostent *rethp, *hp, hpbuf;
+ char *aliases[MAXALIASES + 1], *addrs[2];
+ union inx_addr addrbuf;
+ char buf[BUFSIZ];
+
+ if ((fp = _files_open(errp)) == NULL)
+ return NULL;
+ rethp = hp = NULL;
+
+ while (fgets(buf, sizeof(buf), fp)) {
+ line = buf;
+ if ((addrstr = _hgetword(&line)) == NULL
+ || (cname = _hgetword(&line)) == NULL)
+ continue;
+ match = (strcasecmp(cname, name) == 0);
+ nalias = 0;
+ while ((p = _hgetword(&line)) != NULL) {
+ if (!match)
+ match = (strcasecmp(p, name) == 0);
+ if (nalias < MAXALIASES)
+ aliases[nalias++] = p;
+ }
+ if (!match)
+ continue;
+ if (inet_pton(af, addrstr, &addrbuf) != 1) {
+ *errp = NO_DATA; /* name found */
+ continue;
+ }
+ hp = &hpbuf;
+ hp->h_name = cname;
+ hp->h_aliases = aliases;
+ aliases[nalias] = NULL;
+ hp->h_addrtype = af;
+ hp->h_length = ADDRLEN(af);
+ hp->h_addr_list = addrs;
+ addrs[0] = (char *)&addrbuf;
+ addrs[1] = NULL;
+ hp = _hpcopy(hp, errp);
+ rethp = _hpmerge(rethp, hp, errp);
+ }
+ fclose(fp);
+ return rethp;
+}
+
+static struct hostent *
+_files_ghbyaddr(const void *addr, int addrlen, int af, int *errp)
+{
+ int nalias;
+ char *p, *line;
+ FILE *fp;
+ struct hostent *hp, hpbuf;
+ char *aliases[MAXALIASES + 1], *addrs[2];
+ union inx_addr addrbuf;
+ char buf[BUFSIZ];
+
+ if ((fp = _files_open(errp)) == NULL)
+ return NULL;
+ hp = NULL;
+ while (fgets(buf, sizeof(buf), fp)) {
+ line = buf;
+ if ((p = _hgetword(&line)) == NULL
+ || inet_pton(af, p, &addrbuf) != 1
+ || memcmp(addr, &addrbuf, addrlen) != 0
+ || (p = _hgetword(&line)) == NULL)
+ continue;
+ hp = &hpbuf;
+ hp->h_name = p;
+ hp->h_aliases = aliases;
+ nalias = 0;
+ while ((p = _hgetword(&line)) != NULL) {
+ if (nalias < MAXALIASES)
+ aliases[nalias++] = p;
+ }
+ aliases[nalias] = NULL;
+ hp->h_addrtype = af;
+ hp->h_length = addrlen;
+ hp->h_addr_list = addrs;
+ addrs[0] = (char *)&addrbuf;
+ addrs[1] = NULL;
+ hp = _hpcopy(hp, errp);
+ break;
+ }
+ fclose(fp);
+ return hp;
+}
+
+#ifdef DEBUG
+#define DNS_ASSERT(X) if (!(X)) { fprintf(stderr, "ASSFAIL: %s %d: %s\n", __FILE__, __LINE__, #X); goto badanswer; }
+#else
+#define DNS_ASSERT(X) if (!(X)) { goto badanswer; }
+#endif
+
+static struct hostent *
+_dns_ghbyname(const char *name, int af, int *errp)
+{
+ int n;
+ u_char answer[BUFSIZ];
+ char tbuf[MAXDNAME+1];
+ HEADER *hp;
+ u_char *cp, *eom;
+ int qtype;
+ int type, class, ancount, qdcount;
+ u_long ttl;
+ char hostbuf[BUFSIZ];
+ char *bp;
+ char *alist[MAXALIASES];
+ char *hlist[MAXADDRS];
+ struct hostent hbuf;
+ int buflen;
+ int na, nh;
+
+ if ((_res.options & RES_INIT) == 0) {
+ if (res_init() < 0) {
+ *errp = h_errno;
+ return NULL;
+ }
+ }
+ hbuf.h_aliases = alist;
+ hbuf.h_addrtype = af;
+ hbuf.h_length = ADDRLEN(af);
+ hbuf.h_addr_list = hlist;
+ na = nh = 0;
+
+#ifdef INET6
+ qtype = (af == AF_INET6 ? T_AAAA : T_A);
+#else
+ qtype = T_A;
+#endif
+ n = res_search(name, C_IN, qtype, answer, sizeof(answer));
+ if (n < 0) {
+ *errp = h_errno;
+ return NULL;
+ }
+ hp = (HEADER *)answer;
+ eom = answer + n;
+ ancount = ntohs(hp->ancount);
+ qdcount = ntohs(hp->qdcount);
+ DNS_ASSERT(qdcount == 1);
+ cp = answer + sizeof(HEADER);
+ bp = hostbuf;
+ buflen = sizeof(hostbuf);
+
+ n = dn_expand(answer, eom, cp, bp, buflen);
+ DNS_ASSERT(n >= 0);
+ cp += n + QFIXEDSZ;
+ hbuf.h_name = bp;
+ n = strlen(bp) + 1;
+ bp += n;
+ buflen -= n;
+ while (ancount-- > 0 && cp < eom) {
+ n = dn_expand(answer, eom, cp, bp, buflen);
+ DNS_ASSERT(n >= 0);
+ cp += n; /* name */
+ type = _getshort(cp);
+ cp += 2; /* type */
+ class = _getshort(cp);
+ cp += 2; /* class */
+ ttl = _getlong(cp);
+ cp += 4; /* ttl */
+ n = _getshort(cp);
+ cp += 2; /* len */
+ DNS_ASSERT(class == C_IN);
+ switch (type) {
+ case T_CNAME:
+ if (na >= MAXALIASES-1) {
+ cp += n;
+ break;
+ }
+ n = dn_expand(answer, eom, cp, tbuf, sizeof(tbuf));
+ DNS_ASSERT(n >= 0);
+ cp += n;
+ /* alias */
+ alist[na++] = bp;
+ n = strlen(bp) + 1;
+ bp += n;
+ buflen -= n;
+ /* canon */
+ n = strlen(tbuf) + 1;
+ DNS_ASSERT(n < buflen);
+ strcpy(bp, tbuf);
+ hbuf.h_name = bp;
+ bp += n;
+ buflen -= n;
+ break;
+ case T_A:
+#ifdef INET6
+ case T_AAAA:
+#endif
+ DNS_ASSERT(type == qtype);
+ bp = (char *)ALIGN(bp);
+ DNS_ASSERT(n == hbuf.h_length);
+ DNS_ASSERT(n < buflen);
+ if (nh < MAXADDRS-1) {
+ hlist[nh++] = bp;
+ memcpy(bp, cp, n);
+ bp += n;
+ buflen -= n;
+ }
+ cp += n;
+ break;
+ default:
+ DNS_ASSERT(0);
+ cp += n;
+ break;
+ }
+ }
+ if (nh == 0) {
+ badanswer:
+ *errp = NO_RECOVERY;
+ return NULL;
+ }
+ alist[na] = NULL;
+ hlist[nh] = NULL;
+ return _hpcopy(&hbuf, errp);
+}
+
+static struct hostent *
+_dns_ghbyaddr(const void *addr, int addrlen, int af, int *errp)
+{
+ int n;
+ u_char answer[BUFSIZ];
+ HEADER *hp;
+ u_char c, *cp, *eom;
+ int type, class, ancount, qdcount;
+ u_long ttl;
+ char hostbuf[BUFSIZ];
+ char *bp;
+ char *alist[MAXALIASES];
+ char *hlist[2];
+ struct hostent hbuf;
+ int buflen;
+ int na;
+#ifdef INET6
+ static const char hex[] = "0123456789abcdef";
+#endif
+
+#ifdef INET6
+ /* XXX */
+ if (af == AF_INET6 && IN6_IS_ADDR_LINKLOCAL((struct in6_addr *)addr))
+ return NULL;
+#endif
+
+ if ((_res.options & RES_INIT) == 0) {
+ if (res_init() < 0) {
+ *errp = h_errno;
+ return NULL;
+ }
+ }
+ hbuf.h_name = NULL;
+ hbuf.h_aliases = alist;
+ hbuf.h_addrtype = af;
+ hbuf.h_length = addrlen;
+ hbuf.h_addr_list = hlist;
+ hlist[0] = (char *)addr;
+ hlist[1] = NULL;
+ na = 0;
+
+ n = 0;
+ bp = hostbuf;
+ cp = (u_char *)addr+addrlen-1;
+ switch (af) {
+#ifdef INET6
+ case AF_INET6:
+ for (; n < addrlen; n++, cp--) {
+ c = *cp;
+ *bp++ = hex[c & 0xf];
+ *bp++ = '.';
+ *bp++ = hex[c >> 4];
+ *bp++ = '.';
+ }
+ strcpy(bp, "ip6.int");
+ break;
+#endif
+ default:
+ for (; n < addrlen; n++, cp--) {
+ c = *cp;
+ if (c >= 100)
+ *bp++ = '0' + c / 100;
+ if (c >= 10)
+ *bp++ = '0' + (c % 100) / 10;
+ *bp++ = '0' + c % 10;
+ *bp++ = '.';
+ }
+ strcpy(bp, "in-addr.arpa");
+ break;
+ }
+
+ n = res_query(hostbuf, C_IN, T_PTR, answer, sizeof(answer));
+ if (n < 0) {
+ *errp = h_errno;
+ return NULL;
+ }
+ hp = (HEADER *)answer;
+ eom = answer + n;
+ ancount = ntohs(hp->ancount);
+ qdcount = ntohs(hp->qdcount);
+ DNS_ASSERT(qdcount == 1);
+ cp = answer + sizeof(HEADER);
+ bp = hostbuf;
+ buflen = sizeof(hostbuf);
+
+ n = dn_expand(answer, eom, cp, bp, buflen);
+ DNS_ASSERT(n >= 0);
+ cp += n + QFIXEDSZ;
+ while (ancount-- > 0 && cp < eom) {
+ n = dn_expand(answer, eom, cp, bp, buflen);
+ DNS_ASSERT(n >= 0);
+ cp += n; /* name */
+ type = _getshort(cp);
+ cp += 2; /* type */
+ class = _getshort(cp);
+ cp += 2; /* class */
+ ttl = _getlong(cp);
+ cp += 4; /* ttl */
+ n = _getshort(cp);
+ cp += 2; /* len */
+ DNS_ASSERT(class == C_IN);
+ switch (type) {
+ case T_PTR:
+ n = dn_expand(answer, eom, cp, bp, buflen);
+ DNS_ASSERT(n >= 0);
+ cp += n;
+ if (na >= MAXALIASES-1)
+ break;
+ if (hbuf.h_name == NULL)
+ hbuf.h_name = bp;
+ else
+ alist[na++] = bp;
+ n = strlen(bp) + 1;
+ bp += n;
+ buflen -= n;
+ break;
+ case T_CNAME:
+ cp += n;
+ break;
+ default:
+ badanswer:
+ *errp = NO_RECOVERY;
+ return NULL;
+ }
+ }
+ if (hbuf.h_name == NULL) {
+ *errp = h_errno;
+ return NULL;
+ }
+ alist[na] = NULL;
+ return _hpcopy(&hbuf, errp);
+}
+
+#ifdef ICMPNL
+
+/*
+ * experimental:
+ * draft-ietf-ipngwg-icmp-namelookups-02.txt
+ * ifindex is assumed to be encoded in addr.
+ */
+#include <sys/uio.h>
+#include <netinet/ip6.h>
+#include <netinet/icmp6.h>
+
+struct _icmp_host_cache {
+ struct _icmp_host_cache *hc_next;
+ int hc_ifindex;
+ struct in6_addr hc_addr;
+ char *hc_name;
+};
+
+static char *
+_icmp_fqdn_query(const struct in6_addr *addr, int ifindex)
+{
+ int s;
+ struct icmp6_filter filter;
+ struct msghdr msg;
+ struct cmsghdr *cmsg;
+ struct in6_pktinfo *pkt;
+ char cbuf[256];
+ char buf[1024];
+ int cc;
+ struct icmp6_fqdn_query *fq;
+ struct icmp6_fqdn_reply *fr;
+ struct _icmp_host_cache *hc;
+ struct sockaddr_in6 sin6;
+ struct iovec iov;
+ fd_set s_fds, fds;
+ struct timeval tout;
+ int len;
+ char *name;
+ static int pid;
+ static struct _icmp_host_cache *hc_head;
+
+ for (hc = hc_head; hc; hc = hc->hc_next) {
+ if (hc->hc_ifindex == ifindex
+ && IN6_ARE_ADDR_EQUAL(&hc->hc_addr, addr))
+ return hc->hc_name;
+ }
+
+ if (pid == 0)
+ pid = getpid();
+
+ ICMP6_FILTER_SETBLOCKALL(&filter);
+ ICMP6_FILTER_SETPASS(ICMP6_FQDN_REPLY, &filter);
+
+ FD_ZERO(&s_fds);
+ tout.tv_sec = 0;
+ tout.tv_usec = 200000; /*XXX: 200ms*/
+
+ fq = (struct icmp6_fqdn_query *)buf;
+ fq->icmp6_fqdn_type = ICMP6_FQDN_QUERY;
+ fq->icmp6_fqdn_code = 0;
+ fq->icmp6_fqdn_cksum = 0;
+ fq->icmp6_fqdn_id = (u_short)pid;
+ fq->icmp6_fqdn_unused = 0;
+ fq->icmp6_fqdn_cookie[0] = 0;
+ fq->icmp6_fqdn_cookie[1] = 0;
+
+ memset(&sin6, 0, sizeof(sin6));
+ sin6.sin6_family = AF_INET6;
+ sin6.sin6_addr = *addr;
+
+ memset(&msg, 0, sizeof(msg));
+ msg.msg_name = (caddr_t)&sin6;
+ msg.msg_namelen = sizeof(sin6);
+ msg.msg_iov = &iov;
+ msg.msg_iovlen = 1;
+ msg.msg_control = NULL;
+ msg.msg_controllen = 0;
+ iov.iov_base = (caddr_t)buf;
+ iov.iov_len = sizeof(struct icmp6_fqdn_query);
+
+ if (ifindex) {
+ msg.msg_control = cbuf;
+ msg.msg_controllen = sizeof(cbuf);
+ cmsg = CMSG_FIRSTHDR(&msg);
+ cmsg->cmsg_len = CMSG_LEN(sizeof(struct in6_pktinfo));
+ cmsg->cmsg_level = IPPROTO_IPV6;
+ cmsg->cmsg_type = IPV6_PKTINFO;
+ pkt = (struct in6_pktinfo *)&cmsg[1];
+ memset(&pkt->ipi6_addr, 0, sizeof(struct in6_addr));
+ pkt->ipi6_ifindex = ifindex;
+ cmsg = CMSG_NXTHDR(&msg, cmsg);
+ msg.msg_controllen = (char *)cmsg - cbuf;
+ }
+
+ if ((s = socket(PF_INET6, SOCK_RAW, IPPROTO_ICMPV6)) < 0)
+ return NULL;
+ (void)setsockopt(s, IPPROTO_ICMPV6, ICMP6_FILTER,
+ (char *)&filter, sizeof(filter));
+ cc = sendmsg(s, &msg, 0);
+ if (cc < 0) {
+ close(s);
+ return NULL;
+ }
+ FD_SET(s, &s_fds);
+ for (;;) {
+ fds = s_fds;
+ if (select(s + 1, &fds, NULL, NULL, &tout) <= 0) {
+ close(s);
+ return NULL;
+ }
+ len = sizeof(sin6);
+ cc = recvfrom(s, buf, sizeof(buf), 0,
+ (struct sockaddr *)&sin6, &len);
+ if (cc <= 0) {
+ close(s);
+ return NULL;
+ }
+ if (cc < sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr))
+ continue;
+ if (!IN6_ARE_ADDR_EQUAL(addr, &sin6.sin6_addr))
+ continue;
+ fr = (struct icmp6_fqdn_reply *)(buf + sizeof(struct ip6_hdr));
+ if (fr->icmp6_fqdn_type == ICMP6_FQDN_REPLY)
+ break;
+ }
+ close(s);
+ if (fr->icmp6_fqdn_cookie[1] != 0) {
+ /* rfc1788 type */
+ name = buf + sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr) + 4;
+ len = (buf + cc) - name;
+ } else {
+ len = fr->icmp6_fqdn_namelen;
+ name = fr->icmp6_fqdn_name;
+ }
+ if (len <= 0)
+ return NULL;
+ name[len] = 0;
+
+ if ((hc = (struct _icmp_host_cache *)malloc(sizeof(*hc))) == NULL)
+ return NULL;
+ /* XXX: limit number of cached entries */
+ hc->hc_ifindex = ifindex;
+ hc->hc_addr = *addr;
+ hc->hc_name = strdup(name);
+ hc->hc_next = hc_head;
+ hc_head = hc;
+ return hc->hc_name;
+}
+
+static struct hostent *
+_icmp_ghbyaddr(const void *addr, int addrlen, int af, int *errp)
+{
+ char *hname;
+ int ifindex;
+ struct in6_addr addr6;
+
+ if (af != AF_INET6) {
+ /*
+ * Note: rfc1788 defines Who Are You for IPv4,
+ * but no one implements it.
+ */
+ return NULL;
+ }
+
+ memcpy(&addr6, addr, addrlen);
+ ifindex = (addr6.s6_addr[2] << 8) | addr6.s6_addr[3];
+ addr6.s6_addr[2] = addr6.s6_addr[3] = 0;
+
+ if (!IN6_IS_ADDR_LINKLOCAL(&addr6))
+ return NULL; /*XXX*/
+
+ if ((hname = _icmp_fqdn_query(&addr6, ifindex)) == NULL)
+ return NULL;
+ return _hpaddr(af, hname, &addr6, errp);
+}
+#endif /* ICMPNL */