1 /* $KAME: getaddrinfo.c,v 1.15 2000/07/09 04:37:24 itojun Exp $ */
4 * SPDX-License-Identifier: BSD-3-Clause
6 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
17 * 3. Neither the name of the project nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
21 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
35 * Issues to be discussed:
36 * - Return values. There are nonstandard return values defined and used
37 * in the source code. This is because RFC2553 is silent about which error
38 * code must be returned for which situation.
39 * - freeaddrinfo(NULL). RFC2553 is silent about it. XNET 5.2 says it is
40 * invalid. Current code accepts NULL to be compatible with other OSes.
43 * - The code filters out AFs that are not supported by the kernel,
44 * when globbing NULL hostname (to loopback, or wildcard). Is it the right
45 * thing to do? What is the relationship with post-RFC2553 AI_ADDRCONFIG
47 * - (post-2553) semantics of AI_ADDRCONFIG itself is too vague.
48 * (1) what should we do against numeric hostname (2) what should we do
49 * against NULL hostname (3) what is AI_ADDRCONFIG itself. AF not ready?
50 * non-loopback address configured? global address configured?
52 * OS specific notes for freebsd4:
53 * - FreeBSD supported $GAI. The code does not.
56 #include <sys/cdefs.h>
57 __FBSDID("$FreeBSD$");
59 #include "namespace.h"
60 #include <sys/param.h>
61 #include <sys/socket.h>
63 #include <netinet/in.h>
64 #include <net/if_types.h>
66 #include <sys/queue.h>
68 #include <sys/sysctl.h>
69 #include <sys/ioctl.h>
70 #include <netinet6/in6_var.h>
71 #include <netinet6/nd6.h>
73 #include <arpa/inet.h>
74 #include <arpa/nameser.h>
76 #include <rpcsvc/yp_prot.h>
77 #include <rpcsvc/ypclnt.h>
88 #include "res_config.h"
96 #include "un-namespace.h"
97 #include "netdb_private.h"
98 #include "libc_private.h"
107 static const char in_addrany[] = { 0, 0, 0, 0 };
108 static const char in_loopback[] = { 127, 0, 0, 1 };
110 static const char in6_addrany[] = {
111 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
113 static const char in6_loopback[] = {
114 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1
119 TAILQ_ENTRY(policyqueue) pc_entry;
121 struct in6_addrpolicy pc_policy;
124 TAILQ_HEAD(policyhead, policyqueue);
126 static const struct afd {
131 const char *a_addrany;
132 const char *a_loopback;
137 {PF_INET6, sizeof(struct in6_addr),
138 sizeof(struct sockaddr_in6),
139 offsetof(struct sockaddr_in6, sin6_addr),
140 in6_addrany, in6_loopback, 1},
147 {PF_INET, sizeof(struct in_addr),
148 sizeof(struct sockaddr_in),
149 offsetof(struct sockaddr_in, sin_addr),
150 in_addrany, in_loopback, 0},
151 #define sizeofmember(type, member) (sizeof(((type *)0)->member))
152 {PF_LOCAL, sizeofmember(struct sockaddr_un, sun_path),
153 sizeof(struct sockaddr_un),
154 offsetof(struct sockaddr_un, sun_path),
156 {0, 0, 0, 0, NULL, NULL, 0},
165 #define SOCKTYPE_ANY 0x02
166 #define PROTOCOL_ANY 0x04
167 #define WILD_AF(ex) ((ex)->e_wild & AF_ANY)
168 #define WILD_SOCKTYPE(ex) ((ex)->e_wild & SOCKTYPE_ANY)
169 #define WILD_PROTOCOL(ex) ((ex)->e_wild & PROTOCOL_ANY)
172 static const struct explore explore[] = {
174 { PF_INET6, SOCK_DGRAM, IPPROTO_UDP,
175 AF_ANY | SOCKTYPE_ANY | PROTOCOL_ANY },
176 { PF_INET6, SOCK_STREAM, IPPROTO_TCP,
177 AF_ANY | SOCKTYPE_ANY | PROTOCOL_ANY },
178 { PF_INET6, SOCK_STREAM, IPPROTO_SCTP,
179 AF_ANY | SOCKTYPE_ANY },
180 { PF_INET6, SOCK_SEQPACKET, IPPROTO_SCTP,
181 AF_ANY | SOCKTYPE_ANY | PROTOCOL_ANY },
182 { PF_INET6, SOCK_DGRAM, IPPROTO_UDPLITE,
183 AF_ANY | SOCKTYPE_ANY },
184 { PF_INET6, SOCK_RAW, ANY,
185 AF_ANY | PROTOCOL_ANY },
187 { PF_INET, SOCK_DGRAM, IPPROTO_UDP,
188 AF_ANY | SOCKTYPE_ANY | PROTOCOL_ANY },
189 { PF_INET, SOCK_STREAM, IPPROTO_TCP,
190 AF_ANY | SOCKTYPE_ANY | PROTOCOL_ANY },
191 { PF_INET, SOCK_STREAM, IPPROTO_SCTP,
192 AF_ANY | SOCKTYPE_ANY },
193 { PF_INET, SOCK_SEQPACKET, IPPROTO_SCTP,
194 AF_ANY | SOCKTYPE_ANY | PROTOCOL_ANY },
195 { PF_INET, SOCK_DGRAM, IPPROTO_UDPLITE,
196 AF_ANY | SOCKTYPE_ANY },
197 { PF_INET, SOCK_RAW, ANY,
198 AF_ANY | PROTOCOL_ANY },
199 { PF_LOCAL, SOCK_DGRAM, ANY,
200 AF_ANY | SOCKTYPE_ANY | PROTOCOL_ANY },
201 { PF_LOCAL, SOCK_STREAM, ANY,
202 AF_ANY | SOCKTYPE_ANY | PROTOCOL_ANY },
203 { PF_LOCAL, SOCK_SEQPACKET, ANY,
204 AF_ANY | SOCKTYPE_ANY | PROTOCOL_ANY },
214 #define AIO_SRCFLAG_DEPRECATED 0x1
218 struct sockaddr_storage aiou_ss;
219 struct sockaddr aiou_sa;
221 #define aio_srcsa aio_src_un.aiou_sa
222 u_int32_t aio_srcflag;
225 struct policyqueue *aio_srcpolicy;
226 struct policyqueue *aio_dstpolicy;
227 struct addrinfo *aio_ai;
229 int aio_initial_sequence;
232 static const ns_src default_dns_files[] = {
233 { NSSRC_FILES, NS_SUCCESS },
234 { NSSRC_DNS, NS_SUCCESS },
239 struct res_target *next;
240 const char *name; /* domain name */
241 int qclass, qtype; /* class and type of query */
242 u_char *answer; /* buffer to put answer */
243 int anslen; /* size of answer buffer */
244 int n; /* result length */
247 #define MAXPACKET (64*1024)
251 u_char buf[MAXPACKET];
254 static int str2number(const char *, int *);
255 static int explore_copy(const struct addrinfo *, const struct addrinfo *,
257 static int explore_null(const struct addrinfo *,
258 const char *, struct addrinfo **);
259 static int explore_numeric(const struct addrinfo *, const char *,
260 const char *, struct addrinfo **, const char *);
261 static int explore_numeric_scope(const struct addrinfo *, const char *,
262 const char *, struct addrinfo **);
263 static int get_canonname(const struct addrinfo *,
264 struct addrinfo *, const char *);
265 static struct addrinfo *get_ai(const struct addrinfo *,
266 const struct afd *, const char *);
267 static struct addrinfo *copy_ai(const struct addrinfo *);
268 static int get_portmatch(const struct addrinfo *, const char *);
269 static int get_port(struct addrinfo *, const char *, int);
270 static const struct afd *find_afd(int);
271 static int addrconfig(struct addrinfo *);
273 static int is_ifdisabled(char *);
275 static void set_source(struct ai_order *, struct policyhead *);
276 static int comp_dst(const void *, const void *);
278 static int ip6_str2scopeid(char *, struct sockaddr_in6 *, u_int32_t *);
280 static int gai_addr2scopetype(struct sockaddr *);
282 static int explore_fqdn(const struct addrinfo *, const char *,
283 const char *, struct addrinfo **);
285 static int reorder(struct addrinfo *);
286 static int get_addrselectpolicy(struct policyhead *);
287 static void free_addrselectpolicy(struct policyhead *);
288 static struct policyqueue *match_addrselectpolicy(struct sockaddr *,
289 struct policyhead *);
290 static int matchlen(struct sockaddr *, struct sockaddr *);
292 static struct addrinfo *getanswer(const querybuf *, int, const char *, int,
293 const struct addrinfo *, res_state);
294 #if defined(RESOLVSORT)
295 static int addr4sort(struct addrinfo *, res_state);
297 static int _dns_getaddrinfo(void *, void *, va_list);
298 static void _sethtent(FILE **);
299 static void _endhtent(FILE **);
300 static struct addrinfo *_gethtent(FILE **, const char *,
301 const struct addrinfo *);
302 static int _files_getaddrinfo(void *, void *, va_list);
304 static struct addrinfo *_yphostent(char *, const struct addrinfo *);
305 static int _yp_getaddrinfo(void *, void *, va_list);
308 static int addrinfo_id_func(char *, size_t *, va_list, void *);
309 static int addrinfo_marshal_func(char *, size_t *, void *, va_list, void *);
310 static int addrinfo_unmarshal_func(char *, size_t, void *, va_list, void *);
313 static int res_queryN(const char *, struct res_target *, res_state);
314 static int res_searchN(const char *, struct res_target *, res_state);
315 static int res_querydomainN(const char *, const char *,
316 struct res_target *, res_state);
318 /* XXX macros that make external reference is BAD. */
320 #define GET_AI(ai, afd, addr) \
322 /* external reference: pai, error, and label free */ \
323 (ai) = get_ai(pai, (afd), (addr)); \
324 if ((ai) == NULL) { \
325 error = EAI_MEMORY; \
328 } while (/*CONSTCOND*/0)
330 #define GET_PORT(ai, serv) \
332 /* external reference: error and label free */ \
333 error = get_port((ai), (serv), 0); \
336 } while (/*CONSTCOND*/0)
338 #define GET_CANONNAME(ai, str) \
340 /* external reference: pai, error and label free */ \
341 error = get_canonname(pai, (ai), (str)); \
344 } while (/*CONSTCOND*/0)
348 /* external reference: error, and label bad */ \
352 } while (/*CONSTCOND*/0)
354 #define MATCH_FAMILY(x, y, w) \
355 ((x) == (y) || (/*CONSTCOND*/(w) && ((x) == PF_UNSPEC || (y) == PF_UNSPEC)))
356 #define MATCH(x, y, w) \
357 ((x) == (y) || (/*CONSTCOND*/(w) && ((x) == ANY || (y) == ANY)))
360 freeaddrinfo(struct addrinfo *ai)
362 struct addrinfo *next;
366 free(ai->ai_canonname);
367 /* no need to free(ai->ai_addr) */
374 str2number(const char *p, int *portp)
383 v = strtoul(p, &ep, 10);
384 if (errno == 0 && ep && *ep == '\0' && v <= UINT_MAX) {
392 getaddrinfo(const char *hostname, const char *servname,
393 const struct addrinfo *hints, struct addrinfo **res)
395 struct addrinfo sentinel;
396 struct addrinfo *cur;
398 struct addrinfo ai, ai0, *afai;
399 struct addrinfo *pai;
400 const struct afd *afd;
401 const struct explore *ex;
402 struct addrinfo *afailist[nitems(afdl)];
403 struct addrinfo *afai_unspec;
407 /* ensure we return NULL on errors */
410 memset(&ai, 0, sizeof(ai));
412 memset(afailist, 0, sizeof(afailist));
415 memset(&sentinel, 0, sizeof(sentinel));
419 pai->ai_family = PF_UNSPEC;
420 pai->ai_socktype = ANY;
421 pai->ai_protocol = ANY;
423 pai->ai_canonname = NULL;
427 if (hostname == NULL && servname == NULL)
430 /* error check for hints */
431 if (hints->ai_addrlen || hints->ai_canonname ||
432 hints->ai_addr || hints->ai_next)
433 ERR(EAI_BADHINTS); /* xxx */
434 if (hints->ai_flags & ~AI_MASK)
436 switch (hints->ai_family) {
447 memcpy(pai, hints, sizeof(*pai));
450 * if both socktype/protocol are specified, check if they
451 * are meaningful combination.
453 if (pai->ai_socktype != ANY && pai->ai_protocol != ANY) {
454 for (ex = explore; ex->e_af >= 0; ex++) {
455 if (!MATCH_FAMILY(pai->ai_family, ex->e_af,
458 if (!MATCH(pai->ai_socktype, ex->e_socktype,
461 if (!MATCH(pai->ai_protocol, ex->e_protocol,
475 * RFC 3493: AI_ALL and AI_V4MAPPED are effective only against
476 * AF_INET6 query. They need to be ignored if specified in other
479 switch (pai->ai_flags & (AI_ALL | AI_V4MAPPED)) {
481 case AI_ALL | AI_V4MAPPED:
483 if (pai->ai_family != AF_INET6)
484 pai->ai_flags &= ~(AI_ALL | AI_V4MAPPED);
488 pai->ai_flags &= ~(AI_ALL | AI_V4MAPPED);
493 * check for special cases. (1) numeric servname is disallowed if
494 * socktype/protocol are left unspecified. (2) servname is disallowed
495 * for raw and other inet{,6} sockets.
497 if (MATCH_FAMILY(pai->ai_family, PF_INET, 1)
499 || MATCH_FAMILY(pai->ai_family, PF_INET6, 1)
502 ai0 = *pai; /* backup *pai */
504 if (pai->ai_family == PF_UNSPEC) {
506 pai->ai_family = PF_INET6;
508 pai->ai_family = PF_INET;
511 error = get_portmatch(pai, servname);
521 * NULL hostname, or numeric hostname.
522 * If numeric representation of AF1 can be interpreted as FQDN
523 * representation of AF2, we need to think again about the code below.
526 for (afd = afdl; afd->a_af; afd++) {
529 if (!MATCH_FAMILY(pai->ai_family, afd->a_af, 1))
532 if (pai->ai_family == PF_UNSPEC)
533 pai->ai_family = afd->a_af;
535 if (hostname == NULL) {
536 error = explore_null(pai, servname,
537 &afailist[afd - afdl]);
540 * Errors from explore_null should be unexpected and
541 * be caught to avoid returning an incomplete result.
546 error = explore_numeric_scope(pai, hostname, servname,
547 &afailist[afd - afdl]);
550 * explore_numeric_scope returns an error for address
551 * families that do not match that of hostname.
552 * Thus we should not catch the error at this moment.
556 if (!error && afailist[afd - afdl])
564 if (hostname == NULL)
565 ERR(EAI_NONAME); /* used to be EAI_NODATA */
566 if (pai->ai_flags & AI_NUMERICHOST)
569 if ((pai->ai_flags & AI_ADDRCONFIG) != 0 && !addrconfig(&ai0))
573 * hostname as alphabetical name.
576 error = explore_fqdn(pai, hostname, servname, &afai_unspec);
579 for (ex = explore; ex->e_af >= 0; ex++) {
582 if (!MATCH_FAMILY(pai->ai_family, ex->e_af, WILD_AF(ex)))
584 if (!MATCH(pai->ai_socktype, ex->e_socktype,
587 if (!MATCH(pai->ai_protocol, ex->e_protocol,
591 if (pai->ai_family == PF_UNSPEC)
592 pai->ai_family = ex->e_af;
593 if (pai->ai_socktype == ANY && ex->e_socktype != ANY)
594 pai->ai_socktype = ex->e_socktype;
595 if (pai->ai_protocol == ANY && ex->e_protocol != ANY)
596 pai->ai_protocol = ex->e_protocol;
599 * if the servname does not match socktype/protocol, ignore it.
601 if (get_portmatch(pai, servname) != 0)
607 if ((afd = find_afd(pai->ai_family)) == NULL)
609 /* XXX assumes that afd points inside afdl[] */
610 afai = afailist[afd - afdl];
615 error = explore_copy(pai, afai, &cur->ai_next);
619 while (cur && cur->ai_next)
624 * ensure we return either:
625 * - error == 0, non-NULL *res
626 * - error != 0, NULL *res
629 if (sentinel.ai_next) {
631 * If the returned entry is for an active connection,
632 * and the given name is not numeric, reorder the
633 * list, so that the application would try the list
634 * in the most efficient order. Since the head entry
635 * of the original list may contain ai_canonname and
636 * that entry may be moved elsewhere in the new list,
637 * we keep the pointer and will restore it in the new
638 * head entry. (Note that RFC3493 requires the head
639 * entry store it when requested by the caller).
641 if (hints == NULL || !(hints->ai_flags & AI_PASSIVE)) {
646 sentinel.ai_next->ai_canonname;
647 sentinel.ai_next->ai_canonname = NULL;
648 (void)reorder(&sentinel);
649 if (sentinel.ai_next->ai_canonname ==
651 sentinel.ai_next->ai_canonname
653 } else if (canonname != NULL)
657 *res = sentinel.ai_next;
664 freeaddrinfo(afai_unspec);
665 for (afd = afdl; afd->a_af; afd++) {
666 if (afailist[afd - afdl])
667 freeaddrinfo(afailist[afd - afdl]);
670 if (sentinel.ai_next)
671 freeaddrinfo(sentinel.ai_next);
677 reorder(struct addrinfo *sentinel)
679 struct addrinfo *ai, **aip;
680 struct ai_order *aio;
682 struct policyhead policyhead;
684 /* count the number of addrinfo elements for sorting. */
685 for (n = 0, ai = sentinel->ai_next; ai != NULL; ai = ai->ai_next, n++)
689 * If the number is small enough, we can skip the reordering process.
694 /* allocate a temporary array for sort and initialization of it. */
695 if ((aio = calloc(n, sizeof(*aio))) == NULL)
696 return(n); /* give up reordering */
698 /* retrieve address selection policy from the kernel */
699 TAILQ_INIT(&policyhead);
700 if (!get_addrselectpolicy(&policyhead)) {
701 /* no policy is installed into kernel, we don't sort. */
706 for (i = 0, ai = sentinel->ai_next; i < n; ai = ai->ai_next, i++) {
708 aio[i].aio_dstscope = gai_addr2scopetype(ai->ai_addr);
709 aio[i].aio_dstpolicy = match_addrselectpolicy(ai->ai_addr,
711 set_source(&aio[i], &policyhead);
712 aio[i].aio_initial_sequence = i;
715 /* perform sorting. */
716 qsort(aio, n, sizeof(*aio), comp_dst);
718 /* reorder the addrinfo chain. */
719 for (i = 0, aip = &sentinel->ai_next; i < n; i++) {
720 *aip = aio[i].aio_ai;
721 aip = &aio[i].aio_ai->ai_next;
725 /* cleanup and return */
727 free_addrselectpolicy(&policyhead);
732 get_addrselectpolicy(struct policyhead *head)
735 int mib[] = { CTL_NET, PF_INET6, IPPROTO_IPV6, IPV6CTL_ADDRCTLPOLICY };
738 struct in6_addrpolicy *pol, *ep;
740 if (sysctl(mib, nitems(mib), NULL, &l, NULL, 0) < 0)
744 if ((buf = malloc(l)) == NULL)
746 if (sysctl(mib, nitems(mib), buf, &l, NULL, 0) < 0) {
751 ep = (struct in6_addrpolicy *)(buf + l);
752 for (pol = (struct in6_addrpolicy *)buf; pol + 1 <= ep; pol++) {
753 struct policyqueue *new;
755 if ((new = malloc(sizeof(*new))) == NULL) {
756 free_addrselectpolicy(head); /* make the list empty */
759 new->pc_policy = *pol;
760 TAILQ_INSERT_TAIL(head, new, pc_entry);
771 free_addrselectpolicy(struct policyhead *head)
773 struct policyqueue *ent, *nent;
775 for (ent = TAILQ_FIRST(head); ent; ent = nent) {
776 nent = TAILQ_NEXT(ent, pc_entry);
777 TAILQ_REMOVE(head, ent, pc_entry);
782 static struct policyqueue *
783 match_addrselectpolicy(struct sockaddr *addr, struct policyhead *head)
786 struct policyqueue *ent, *bestent = NULL;
787 struct in6_addrpolicy *pol;
788 int matchlen, bestmatchlen = -1;
789 u_char *mp, *ep, *k, *p, m;
790 struct sockaddr_in6 key;
792 switch(addr->sa_family) {
794 key = *(struct sockaddr_in6 *)addr;
797 /* convert the address into IPv4-mapped IPv6 address. */
798 memset(&key, 0, sizeof(key));
799 key.sin6_family = AF_INET6;
800 key.sin6_len = sizeof(key);
802 (char *)&((struct sockaddr_in *)addr)->sin_addr,
803 (char *)&key.sin6_addr);
809 for (ent = TAILQ_FIRST(head); ent; ent = TAILQ_NEXT(ent, pc_entry)) {
810 pol = &ent->pc_policy;
813 mp = (u_char *)&pol->addrmask.sin6_addr;
814 ep = mp + 16; /* XXX: scope field? */
815 k = (u_char *)&key.sin6_addr;
816 p = (u_char *)&pol->addr.sin6_addr;
817 for (; mp < ep && *mp; mp++, k++, p++) {
820 goto next; /* not match */
821 if (m == 0xff) /* short cut for a typical case */
831 /* matched. check if this is better than the current best. */
832 if (matchlen > bestmatchlen) {
834 bestmatchlen = matchlen;
849 set_source(struct ai_order *aio, struct policyhead *ph)
851 struct addrinfo ai = *aio->aio_ai;
852 struct sockaddr_storage ss;
856 /* set unspec ("no source is available"), just in case */
857 aio->aio_srcsa.sa_family = AF_UNSPEC;
858 aio->aio_srcscope = -1;
860 switch(ai.ai_family) {
866 default: /* ignore unsupported AFs explicitly */
870 /* XXX: make a dummy addrinfo to call connect() */
871 ai.ai_socktype = SOCK_DGRAM;
872 ai.ai_protocol = IPPROTO_UDP; /* is UDP too specific? */
874 memset(&ss, 0, sizeof(ss));
875 memcpy(&ss, ai.ai_addr, ai.ai_addrlen);
876 ai.ai_addr = (struct sockaddr *)&ss;
877 get_port(&ai, "1", 0);
879 /* open a socket to get the source address for the given dst */
880 if ((s = _socket(ai.ai_family, ai.ai_socktype | SOCK_CLOEXEC,
881 ai.ai_protocol)) < 0)
882 return; /* give up */
884 if (ai.ai_family == AF_INET6) {
885 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)ai.ai_addr;
888 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr))
889 (void)_setsockopt(s, IPPROTO_IPV6, IPV6_V6ONLY,
890 (char *)&off, sizeof(off));
893 if (_connect(s, ai.ai_addr, ai.ai_addrlen) < 0)
895 srclen = ai.ai_addrlen;
896 if (_getsockname(s, &aio->aio_srcsa, &srclen) < 0) {
897 aio->aio_srcsa.sa_family = AF_UNSPEC;
900 aio->aio_srcscope = gai_addr2scopetype(&aio->aio_srcsa);
901 aio->aio_srcpolicy = match_addrselectpolicy(&aio->aio_srcsa, ph);
902 aio->aio_matchlen = matchlen(&aio->aio_srcsa, aio->aio_ai->ai_addr);
904 if (ai.ai_family == AF_INET6) {
905 struct in6_ifreq ifr6;
908 memset(&ifr6, 0, sizeof(ifr6));
909 memcpy(&ifr6.ifr_addr, ai.ai_addr, ai.ai_addrlen);
910 if (_ioctl(s, SIOCGIFAFLAG_IN6, &ifr6) == 0) {
911 flags6 = ifr6.ifr_ifru.ifru_flags6;
912 if ((flags6 & IN6_IFF_DEPRECATED))
913 aio->aio_srcflag |= AIO_SRCFLAG_DEPRECATED;
924 matchlen(struct sockaddr *src, struct sockaddr *dst)
931 switch (src->sa_family) {
934 s = (u_char *)&((struct sockaddr_in6 *)src)->sin6_addr;
935 d = (u_char *)&((struct sockaddr_in6 *)dst)->sin6_addr;
936 addrlen = sizeof(struct in6_addr);
941 s = (u_char *)&((struct sockaddr_in *)src)->sin_addr;
942 d = (u_char *)&((struct sockaddr_in *)dst)->sin_addr;
943 addrlen = sizeof(struct in_addr);
951 if ((r = (*d++ ^ *s++)) != 0) {
952 while ((r & 0x80) == 0) {
963 comp_dst(const void *arg1, const void *arg2)
965 const struct ai_order *dst1 = arg1, *dst2 = arg2;
968 * Rule 1: Avoid unusable destinations.
969 * XXX: we currently do not consider if an appropriate route exists.
971 if (dst1->aio_srcsa.sa_family != AF_UNSPEC &&
972 dst2->aio_srcsa.sa_family == AF_UNSPEC) {
975 if (dst1->aio_srcsa.sa_family == AF_UNSPEC &&
976 dst2->aio_srcsa.sa_family != AF_UNSPEC) {
980 /* Rule 2: Prefer matching scope. */
981 if (dst1->aio_dstscope == dst1->aio_srcscope &&
982 dst2->aio_dstscope != dst2->aio_srcscope) {
985 if (dst1->aio_dstscope != dst1->aio_srcscope &&
986 dst2->aio_dstscope == dst2->aio_srcscope) {
990 /* Rule 3: Avoid deprecated addresses. */
991 if (dst1->aio_srcsa.sa_family != AF_UNSPEC &&
992 dst2->aio_srcsa.sa_family != AF_UNSPEC) {
993 if (!(dst1->aio_srcflag & AIO_SRCFLAG_DEPRECATED) &&
994 (dst2->aio_srcflag & AIO_SRCFLAG_DEPRECATED)) {
997 if ((dst1->aio_srcflag & AIO_SRCFLAG_DEPRECATED) &&
998 !(dst2->aio_srcflag & AIO_SRCFLAG_DEPRECATED)) {
1003 /* Rule 4: Prefer home addresses. */
1004 /* XXX: not implemented yet */
1006 /* Rule 5: Prefer matching label. */
1008 if (dst1->aio_srcpolicy && dst1->aio_dstpolicy &&
1009 dst1->aio_srcpolicy->pc_policy.label ==
1010 dst1->aio_dstpolicy->pc_policy.label &&
1011 (dst2->aio_srcpolicy == NULL || dst2->aio_dstpolicy == NULL ||
1012 dst2->aio_srcpolicy->pc_policy.label !=
1013 dst2->aio_dstpolicy->pc_policy.label)) {
1016 if (dst2->aio_srcpolicy && dst2->aio_dstpolicy &&
1017 dst2->aio_srcpolicy->pc_policy.label ==
1018 dst2->aio_dstpolicy->pc_policy.label &&
1019 (dst1->aio_srcpolicy == NULL || dst1->aio_dstpolicy == NULL ||
1020 dst1->aio_srcpolicy->pc_policy.label !=
1021 dst1->aio_dstpolicy->pc_policy.label)) {
1026 /* Rule 6: Prefer higher precedence. */
1028 if (dst1->aio_dstpolicy &&
1029 (dst2->aio_dstpolicy == NULL ||
1030 dst1->aio_dstpolicy->pc_policy.preced >
1031 dst2->aio_dstpolicy->pc_policy.preced)) {
1034 if (dst2->aio_dstpolicy &&
1035 (dst1->aio_dstpolicy == NULL ||
1036 dst2->aio_dstpolicy->pc_policy.preced >
1037 dst1->aio_dstpolicy->pc_policy.preced)) {
1042 /* Rule 7: Prefer native transport. */
1043 /* XXX: not implemented yet */
1045 /* Rule 8: Prefer smaller scope. */
1046 if (dst1->aio_dstscope >= 0 &&
1047 dst1->aio_dstscope < dst2->aio_dstscope) {
1050 if (dst2->aio_dstscope >= 0 &&
1051 dst2->aio_dstscope < dst1->aio_dstscope) {
1056 * Rule 9: Use longest matching prefix.
1057 * We compare the match length in a same AF only.
1059 if (dst1->aio_ai->ai_addr->sa_family ==
1060 dst2->aio_ai->ai_addr->sa_family &&
1061 dst1->aio_ai->ai_addr->sa_family != AF_INET) {
1062 if (dst1->aio_matchlen > dst2->aio_matchlen) {
1065 if (dst1->aio_matchlen < dst2->aio_matchlen) {
1070 /* Rule 10: Otherwise, leave the order unchanged. */
1073 * Note that qsort is unstable; so, we can't return zero and
1074 * expect the order to be unchanged.
1075 * That also means we can't depend on the current position of
1076 * dst2 being after dst1. We must enforce the initial order
1077 * with an explicit compare on the original position.
1078 * The qsort specification requires that "When the same objects
1079 * (consisting of width bytes, irrespective of their current
1080 * positions in the array) are passed more than once to the
1081 * comparison function, the results shall be consistent with one
1083 * In other words, If A < B, then we must also return B > A.
1085 if (dst2->aio_initial_sequence < dst1->aio_initial_sequence)
1092 * Copy from scope.c.
1093 * XXX: we should standardize the functions and link them as standard
1097 gai_addr2scopetype(struct sockaddr *sa)
1100 struct sockaddr_in6 *sa6;
1102 struct sockaddr_in *sa4;
1104 switch(sa->sa_family) {
1107 sa6 = (struct sockaddr_in6 *)sa;
1108 if (IN6_IS_ADDR_MULTICAST(&sa6->sin6_addr)) {
1109 /* just use the scope field of the multicast address */
1110 return(sa6->sin6_addr.s6_addr[2] & 0x0f);
1113 * Unicast addresses: map scope type to corresponding scope
1114 * value defined for multcast addresses.
1115 * XXX: hardcoded scope type values are bad...
1117 if (IN6_IS_ADDR_LOOPBACK(&sa6->sin6_addr))
1118 return(1); /* node local scope */
1119 if (IN6_IS_ADDR_LINKLOCAL(&sa6->sin6_addr))
1120 return(2); /* link-local scope */
1121 if (IN6_IS_ADDR_SITELOCAL(&sa6->sin6_addr))
1122 return(5); /* site-local scope */
1123 return(14); /* global scope */
1128 * IPv4 pseudo scoping according to RFC 3484.
1130 sa4 = (struct sockaddr_in *)sa;
1131 /* IPv4 autoconfiguration addresses have link-local scope. */
1132 if (((u_char *)&sa4->sin_addr)[0] == 169 &&
1133 ((u_char *)&sa4->sin_addr)[1] == 254)
1135 /* Private addresses have site-local scope. */
1136 if (((u_char *)&sa4->sin_addr)[0] == 10 ||
1137 (((u_char *)&sa4->sin_addr)[0] == 172 &&
1138 (((u_char *)&sa4->sin_addr)[1] & 0xf0) == 16) ||
1139 (((u_char *)&sa4->sin_addr)[0] == 192 &&
1140 ((u_char *)&sa4->sin_addr)[1] == 168))
1141 return(14); /* XXX: It should be 5 unless NAT */
1142 /* Loopback addresses have link-local scope. */
1143 if (((u_char *)&sa4->sin_addr)[0] == 127)
1148 errno = EAFNOSUPPORT; /* is this a good error? */
1154 explore_copy(const struct addrinfo *pai, const struct addrinfo *src0,
1155 struct addrinfo **res)
1158 struct addrinfo sentinel, *cur;
1159 const struct addrinfo *src;
1162 sentinel.ai_next = NULL;
1165 for (src = src0; src != NULL; src = src->ai_next) {
1166 if (src->ai_family != pai->ai_family)
1169 cur->ai_next = copy_ai(src);
1170 if (!cur->ai_next) {
1175 cur->ai_next->ai_socktype = pai->ai_socktype;
1176 cur->ai_next->ai_protocol = pai->ai_protocol;
1180 *res = sentinel.ai_next;
1184 freeaddrinfo(sentinel.ai_next);
1190 * passive socket -> anyaddr (0.0.0.0 or ::)
1191 * non-passive socket -> localhost (127.0.0.1 or ::1)
1194 explore_null(const struct addrinfo *pai, const char *servname,
1195 struct addrinfo **res)
1198 const struct afd *afd;
1199 struct addrinfo *ai;
1205 if (pai->ai_family == PF_LOCAL)
1209 * filter out AFs that are not supported by the kernel
1212 s = _socket(pai->ai_family, SOCK_DGRAM | SOCK_CLOEXEC, 0);
1214 if (errno != EMFILE)
1219 afd = find_afd(pai->ai_family);
1223 if (pai->ai_flags & AI_PASSIVE) {
1224 GET_AI(ai, afd, afd->a_addrany);
1225 GET_PORT(ai, servname);
1227 GET_AI(ai, afd, afd->a_loopback);
1228 GET_PORT(ai, servname);
1244 explore_numeric(const struct addrinfo *pai, const char *hostname,
1245 const char *servname, struct addrinfo **res, const char *canonname)
1247 const struct afd *afd;
1248 struct addrinfo *ai, ai0;
1250 char pton[PTON_MAX], path[PATH_MAX], *p;
1253 CTASSERT(sizeofmember(struct sockaddr_un, sun_path) <= PATH_MAX);
1258 afd = find_afd(pai->ai_family);
1262 switch (afd->a_af) {
1264 if (hostname[0] != '/')
1266 if (strlen(hostname) > afd->a_addrlen)
1268 /* NUL-termination does not need to be guaranteed. */
1269 strncpy(path, hostname, afd->a_addrlen);
1274 * RFC3493 requires getaddrinfo() to accept AF_INET formats
1275 * that are accepted by inet_addr() and its family. The
1276 * accepted forms includes the "classful" one, which inet_pton
1277 * does not accept. So we need to separate the case for
1280 if (inet_aton(hostname, (struct in_addr *)pton) != 1)
1285 if (inet_pton(afd->a_af, hostname, pton) != 1) {
1286 if (pai->ai_family != AF_INET6 ||
1287 (pai->ai_flags & AI_V4MAPPED) != AI_V4MAPPED)
1289 if (inet_aton(hostname, (struct in_addr *)pton) != 1)
1291 afd = &afdl[N_INET];
1293 ai0.ai_family = AF_INET;
1300 if (pai->ai_family == afd->a_af) {
1302 GET_PORT(ai, servname);
1303 if ((pai->ai_family == AF_INET ||
1304 pai->ai_family == AF_INET6) &&
1305 (pai->ai_flags & AI_CANONNAME)) {
1307 * Set the numeric address itself as the canonical
1308 * name, based on a clarification in RFC3493.
1310 GET_CANONNAME(ai, canonname);
1314 * XXX: This should not happen since we already matched the AF
1331 * numeric hostname with scope
1334 explore_numeric_scope(const struct addrinfo *pai, const char *hostname,
1335 const char *servname, struct addrinfo **res)
1337 #if !defined(SCOPE_DELIMITER) || !defined(INET6)
1338 return explore_numeric(pai, hostname, servname, res, hostname);
1340 const struct afd *afd;
1341 struct addrinfo *cur;
1343 char *cp, *hostname2 = NULL, *scope, *addr;
1344 struct sockaddr_in6 *sin6;
1346 afd = find_afd(pai->ai_family);
1351 return explore_numeric(pai, hostname, servname, res, hostname);
1353 cp = strchr(hostname, SCOPE_DELIMITER);
1355 return explore_numeric(pai, hostname, servname, res, hostname);
1358 * Handle special case of <scoped_address><delimiter><scope id>
1360 hostname2 = strdup(hostname);
1361 if (hostname2 == NULL)
1363 /* terminate at the delimiter */
1364 hostname2[cp - hostname] = '\0';
1368 error = explore_numeric(pai, addr, servname, res, hostname);
1372 for (cur = *res; cur; cur = cur->ai_next) {
1373 if (cur->ai_family != AF_INET6)
1375 sin6 = (struct sockaddr_in6 *)(void *)cur->ai_addr;
1376 if (ip6_str2scopeid(scope, sin6, &scopeid) == -1) {
1380 return(EAI_NONAME); /* XXX: is return OK? */
1382 sin6->sin6_scope_id = scopeid;
1388 if (error && *res) {
1397 get_canonname(const struct addrinfo *pai, struct addrinfo *ai, const char *str)
1399 if ((pai->ai_flags & AI_CANONNAME) != 0) {
1400 ai->ai_canonname = strdup(str);
1401 if (ai->ai_canonname == NULL)
1407 static struct addrinfo *
1408 get_ai(const struct addrinfo *pai, const struct afd *afd, const char *addr)
1411 struct addrinfo *ai;
1413 struct in6_addr mapaddr;
1415 if (afd->a_af == AF_INET && (pai->ai_flags & AI_V4MAPPED) != 0) {
1416 afd = &afdl[N_INET6];
1417 _map_v4v6_address(addr, (char *)&mapaddr);
1418 addr = (char *)&mapaddr;
1422 ai = (struct addrinfo *)malloc(sizeof(struct addrinfo)
1423 + (afd->a_socklen));
1427 memcpy(ai, pai, sizeof(struct addrinfo));
1428 ai->ai_addr = (struct sockaddr *)(void *)(ai + 1);
1429 memset(ai->ai_addr, 0, (size_t)afd->a_socklen);
1430 ai->ai_addr->sa_len = afd->a_socklen;
1431 ai->ai_addrlen = afd->a_socklen;
1432 if (ai->ai_family == PF_LOCAL) {
1433 size_t n = strnlen(addr, afd->a_addrlen);
1435 ai->ai_addrlen -= afd->a_addrlen - n;
1436 ai->ai_addr->sa_len -= afd->a_addrlen - n;
1438 ai->ai_addr->sa_family = ai->ai_family = afd->a_af;
1439 p = (char *)(void *)(ai->ai_addr);
1440 memcpy(p + afd->a_off, addr, (size_t)afd->a_addrlen);
1444 /* XXX need to malloc() the same way we do from other functions! */
1445 static struct addrinfo *
1446 copy_ai(const struct addrinfo *pai)
1448 struct addrinfo *ai;
1451 l = sizeof(*ai) + pai->ai_addrlen;
1452 if ((ai = calloc(1, l)) == NULL)
1454 memcpy(ai, pai, sizeof(*ai));
1455 ai->ai_addr = (struct sockaddr *)(void *)(ai + 1);
1456 memcpy(ai->ai_addr, pai->ai_addr, pai->ai_addrlen);
1458 if (pai->ai_canonname) {
1459 l = strlen(pai->ai_canonname) + 1;
1460 if ((ai->ai_canonname = malloc(l)) == NULL) {
1464 strlcpy(ai->ai_canonname, pai->ai_canonname, l);
1466 /* just to make sure */
1467 ai->ai_canonname = NULL;
1476 get_portmatch(const struct addrinfo *ai, const char *servname)
1479 /* get_port does not touch first argument when matchonly == 1. */
1480 /* LINTED const cast */
1481 return get_port((struct addrinfo *)ai, servname, 1);
1485 get_port(struct addrinfo *ai, const char *servname, int matchonly)
1492 if (servname == NULL)
1494 switch (ai->ai_family) {
1496 /* AF_LOCAL ignores servname silently. */
1507 switch (ai->ai_socktype) {
1512 case SOCK_SEQPACKET:
1516 switch (ai->ai_family) {
1529 return EAI_SOCKTYPE;
1532 error = str2number(servname, &port);
1536 if (port < 0 || port > 65535)
1540 if (ai->ai_flags & AI_NUMERICSERV)
1543 switch (ai->ai_protocol) {
1553 case IPPROTO_UDPLITE:
1561 if ((sp = getservbyname(servname, proto)) == NULL)
1567 switch (ai->ai_family) {
1569 ((struct sockaddr_in *)(void *)
1570 ai->ai_addr)->sin_port = port;
1574 ((struct sockaddr_in6 *)(void *)
1575 ai->ai_addr)->sin6_port = port;
1584 static const struct afd *
1587 const struct afd *afd;
1589 if (af == PF_UNSPEC)
1591 for (afd = afdl; afd->a_af; afd++) {
1592 if (afd->a_af == af)
1599 * RFC 3493: AI_ADDRCONFIG check. Determines which address families are
1600 * configured on the local system and correlates with pai->ai_family value.
1601 * If an address family is not configured on the system, it will not be
1602 * queried for. For this purpose, loopback addresses are not considered
1603 * configured addresses.
1605 * XXX PF_UNSPEC -> PF_INET6 + PF_INET mapping needs to be in sync with
1609 addrconfig(struct addrinfo *pai)
1611 struct ifaddrs *ifaddrs, *ifa;
1612 struct sockaddr_in *sin;
1614 struct sockaddr_in6 *sin6;
1616 int seen_inet = 0, seen_inet6 = 0;
1618 if (getifaddrs(&ifaddrs) != 0)
1621 for (ifa = ifaddrs; ifa != NULL; ifa = ifa->ifa_next) {
1622 if (ifa->ifa_addr == NULL || (ifa->ifa_flags & IFF_UP) == 0)
1624 switch (ifa->ifa_addr->sa_family) {
1628 sin = (struct sockaddr_in *)(ifa->ifa_addr);
1629 if (htonl(sin->sin_addr.s_addr) == INADDR_LOOPBACK)
1637 sin6 = (struct sockaddr_in6 *)(ifa->ifa_addr);
1638 if (IN6_IS_ADDR_LOOPBACK(&sin6->sin6_addr))
1640 if ((ifa->ifa_flags & IFT_LOOP) != 0 &&
1641 IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr))
1643 if (is_ifdisabled(ifa->ifa_name))
1650 freeifaddrs(ifaddrs);
1652 switch(pai->ai_family) {
1654 return (seen_inet6);
1658 if (seen_inet == seen_inet6)
1660 pai->ai_family = seen_inet ? AF_INET : AF_INET6;
1668 is_ifdisabled(char *name)
1670 struct in6_ndireq nd;
1673 if ((fd = _socket(AF_INET6, SOCK_DGRAM | SOCK_CLOEXEC, 0)) < 0)
1675 memset(&nd, 0, sizeof(nd));
1676 strlcpy(nd.ifname, name, sizeof(nd.ifname));
1677 if (_ioctl(fd, SIOCGIFINFO_IN6, &nd) < 0) {
1682 return ((nd.ndi.flags & ND6_IFF_IFDISABLED) != 0);
1685 /* convert a string to a scope identifier. XXX: IPv6 specific */
1687 ip6_str2scopeid(char *scope, struct sockaddr_in6 *sin6, u_int32_t *scopeid)
1690 struct in6_addr *a6;
1693 a6 = &sin6->sin6_addr;
1695 /* empty scopeid portion is invalid */
1699 if (IN6_IS_ADDR_LINKLOCAL(a6) || IN6_IS_ADDR_MC_LINKLOCAL(a6) ||
1700 IN6_IS_ADDR_MC_NODELOCAL(a6)) {
1702 * We currently assume a one-to-one mapping between links
1703 * and interfaces, so we simply use interface indices for
1704 * like-local scopes.
1706 *scopeid = if_nametoindex(scope);
1712 /* still unclear about literal, allow numeric only - placeholder */
1713 if (IN6_IS_ADDR_SITELOCAL(a6) || IN6_IS_ADDR_MC_SITELOCAL(a6))
1715 if (IN6_IS_ADDR_MC_ORGLOCAL(a6))
1718 goto trynumeric; /* global */
1720 /* try to convert to a numeric id as a last resort */
1723 lscopeid = strtoul(scope, &ep, 10);
1724 *scopeid = (u_int32_t)(lscopeid & 0xffffffffUL);
1725 if (errno == 0 && ep && *ep == '\0' && *scopeid == lscopeid)
1735 addrinfo_id_func(char *buffer, size_t *buffer_size, va_list ap,
1741 const int op_id = 0; /* identifies the getaddrinfo for the cache */
1743 struct addrinfo *hints;
1746 int ai_flags, ai_family, ai_socktype, ai_protocol;
1747 size_t desired_size, size;
1749 statp = __res_state();
1750 res_options = statp->options & (RES_RECURSE | RES_DEFNAMES |
1751 RES_DNSRCH | RES_NOALIASES | RES_USE_INET6);
1753 hostname = va_arg(ap, char *);
1754 hints = va_arg(ap, struct addrinfo *);
1756 desired_size = sizeof(res_options) + sizeof(int) + sizeof(int) * 4;
1757 if (hostname != NULL) {
1758 size = strlen(hostname);
1759 desired_size += size + 1;
1763 if (desired_size > *buffer_size) {
1764 *buffer_size = desired_size;
1769 ai_flags = ai_family = ai_socktype = ai_protocol = 0;
1771 ai_flags = hints->ai_flags;
1772 ai_family = hints->ai_family;
1773 ai_socktype = hints->ai_socktype;
1774 ai_protocol = hints->ai_protocol;
1778 memcpy(p, &res_options, sizeof(res_options));
1779 p += sizeof(res_options);
1781 memcpy(p, &op_id, sizeof(int));
1784 memcpy(p, &ai_flags, sizeof(int));
1787 memcpy(p, &ai_family, sizeof(int));
1790 memcpy(p, &ai_socktype, sizeof(int));
1793 memcpy(p, &ai_protocol, sizeof(int));
1796 if (hostname != NULL)
1797 memcpy(p, hostname, size);
1799 *buffer_size = desired_size;
1800 return (NS_SUCCESS);
1804 addrinfo_marshal_func(char *buffer, size_t *buffer_size, void *retval,
1805 va_list ap, void *cache_mdata)
1807 struct addrinfo *ai, *cai;
1809 size_t desired_size, size, ai_size;
1811 ai = *((struct addrinfo **)retval);
1813 desired_size = sizeof(size_t);
1815 for (cai = ai; cai != NULL; cai = cai->ai_next) {
1816 desired_size += sizeof(struct addrinfo) + cai->ai_addrlen;
1817 if (cai->ai_canonname != NULL)
1818 desired_size += sizeof(size_t) +
1819 strlen(cai->ai_canonname);
1823 if (desired_size > *buffer_size) {
1824 /* this assignment is here for future use */
1826 *buffer_size = desired_size;
1830 memset(buffer, 0, desired_size);
1833 memcpy(p, &ai_size, sizeof(size_t));
1834 p += sizeof(size_t);
1835 for (cai = ai; cai != NULL; cai = cai->ai_next) {
1836 memcpy(p, cai, sizeof(struct addrinfo));
1837 p += sizeof(struct addrinfo);
1839 memcpy(p, cai->ai_addr, cai->ai_addrlen);
1840 p += cai->ai_addrlen;
1842 if (cai->ai_canonname != NULL) {
1843 size = strlen(cai->ai_canonname);
1844 memcpy(p, &size, sizeof(size_t));
1845 p += sizeof(size_t);
1847 memcpy(p, cai->ai_canonname, size);
1852 return (NS_SUCCESS);
1856 addrinfo_unmarshal_func(char *buffer, size_t buffer_size, void *retval,
1857 va_list ap, void *cache_mdata)
1859 struct addrinfo new_ai, *result, *sentinel, *lasts;
1862 size_t ai_size, ai_i, size;
1865 memcpy(&ai_size, p, sizeof(size_t));
1866 p += sizeof(size_t);
1870 for (ai_i = 0; ai_i < ai_size; ++ai_i) {
1871 memcpy(&new_ai, p, sizeof(struct addrinfo));
1872 p += sizeof(struct addrinfo);
1873 size = new_ai.ai_addrlen + sizeof(struct addrinfo) +
1876 sentinel = calloc(1, size);
1878 memcpy(sentinel, &new_ai, sizeof(struct addrinfo));
1879 sentinel->ai_addr = (struct sockaddr *)_ALIGN((char *)sentinel +
1880 sizeof(struct addrinfo));
1882 memcpy(sentinel->ai_addr, p, new_ai.ai_addrlen);
1883 p += new_ai.ai_addrlen;
1885 if (new_ai.ai_canonname != NULL) {
1886 memcpy(&size, p, sizeof(size_t));
1887 p += sizeof(size_t);
1889 sentinel->ai_canonname = calloc(1, size + 1);
1891 memcpy(sentinel->ai_canonname, p, size);
1895 if (result == NULL) {
1899 lasts->ai_next = sentinel;
1904 *((struct addrinfo **)retval) = result;
1905 return (NS_SUCCESS);
1907 #endif /* NS_CACHING */
1910 * FQDN hostname, DNS lookup
1913 explore_fqdn(const struct addrinfo *pai, const char *hostname,
1914 const char *servname, struct addrinfo **res)
1916 struct addrinfo *result;
1917 struct addrinfo *cur;
1921 static const nss_cache_info cache_info =
1922 NS_COMMON_CACHE_INFO_INITIALIZER(
1923 hosts, NULL, addrinfo_id_func, addrinfo_marshal_func,
1924 addrinfo_unmarshal_func);
1926 static const ns_dtab dtab[] = {
1927 NS_FILES_CB(_files_getaddrinfo, NULL)
1928 { NSSRC_DNS, _dns_getaddrinfo, NULL }, /* force -DHESIOD */
1929 NS_NIS_CB(_yp_getaddrinfo, NULL)
1931 NS_CACHE_CB(&cache_info)
1939 * if the servname does not match socktype/protocol, ignore it.
1941 if (get_portmatch(pai, servname) != 0)
1944 switch (_nsdispatch(&result, dtab, NSDB_HOSTS, "getaddrinfo",
1945 default_dns_files, hostname, pai)) {
1957 for (cur = result; cur; cur = cur->ai_next) {
1958 GET_PORT(cur, servname);
1959 /* canonname should be filled already */
1970 freeaddrinfo(result);
1975 static const char AskedForGot[] =
1976 "gethostby*.getanswer: asked for \"%s\", got \"%s\"";
1979 static struct addrinfo *
1980 getanswer(const querybuf *answer, int anslen, const char *qname, int qtype,
1981 const struct addrinfo *pai, res_state res)
1983 struct addrinfo sentinel, *cur;
1985 const struct afd *afd;
1992 int type, class, ancount, qdcount;
1993 int haveanswer, had_error;
1994 char tbuf[MAXDNAME];
1995 int (*name_ok)(const char *);
1996 char hostbuf[8*1024];
1998 memset(&sentinel, 0, sizeof(sentinel));
2002 eom = answer->buf + anslen;
2006 case T_ANY: /*use T_ANY only for T_A/T_AAAA lookup*/
2010 return (NULL); /* XXX should be abort(); */
2013 * find first satisfactory answer
2016 ancount = ntohs(hp->ancount);
2017 qdcount = ntohs(hp->qdcount);
2019 ep = hostbuf + sizeof hostbuf;
2020 cp = answer->buf + HFIXEDSZ;
2022 RES_SET_H_ERRNO(res, NO_RECOVERY);
2025 n = dn_expand(answer->buf, eom, cp, bp, ep - bp);
2026 if ((n < 0) || !(*name_ok)(bp)) {
2027 RES_SET_H_ERRNO(res, NO_RECOVERY);
2031 if (qtype == T_A || qtype == T_AAAA || qtype == T_ANY) {
2032 /* res_send() has already verified that the query name is the
2033 * same as the one we sent; this just gets the expanded name
2034 * (i.e., with the succeeding search-domain tacked on).
2036 n = strlen(bp) + 1; /* for the \0 */
2037 if (n >= MAXHOSTNAMELEN) {
2038 RES_SET_H_ERRNO(res, NO_RECOVERY);
2043 /* The qname can be abbreviated, but h_name is now absolute. */
2048 while (ancount-- > 0 && cp < eom && !had_error) {
2049 n = dn_expand(answer->buf, eom, cp, bp, ep - bp);
2050 if ((n < 0) || !(*name_ok)(bp)) {
2055 type = _getshort(cp);
2056 cp += INT16SZ; /* type */
2057 class = _getshort(cp);
2058 cp += INT16SZ + INT32SZ; /* class, TTL */
2060 cp += INT16SZ; /* len */
2061 if (class != C_IN) {
2062 /* XXX - debug? syslog? */
2064 continue; /* XXX - had_error++ ? */
2066 if ((qtype == T_A || qtype == T_AAAA || qtype == T_ANY) &&
2068 n = dn_expand(answer->buf, eom, cp, tbuf, sizeof tbuf);
2069 if ((n < 0) || !(*name_ok)(tbuf)) {
2074 /* Get canonical name. */
2075 n = strlen(tbuf) + 1; /* for the \0 */
2076 if (n > ep - bp || n >= MAXHOSTNAMELEN) {
2080 strlcpy(bp, tbuf, ep - bp);
2085 if (qtype == T_ANY) {
2086 if (!(type == T_A || type == T_AAAA)) {
2090 } else if (type != qtype) {
2092 if (type != T_KEY && type != T_SIG &&
2094 syslog(LOG_NOTICE|LOG_AUTH,
2095 "gethostby*.getanswer: asked for \"%s %s %s\", got type \"%s\"",
2096 qname, p_class(C_IN), p_type(qtype),
2100 continue; /* XXX - had_error++ ? */
2105 if (strcasecmp(canonname, bp) != 0) {
2107 syslog(LOG_NOTICE|LOG_AUTH,
2108 AskedForGot, canonname, bp);
2111 continue; /* XXX - had_error++ ? */
2113 if (type == T_A && n != INADDRSZ) {
2117 if (type == T_AAAA && n != IN6ADDRSZ) {
2121 #ifdef FILTER_V4MAPPED
2122 if (type == T_AAAA) {
2123 struct in6_addr in6;
2124 memcpy(&in6, cp, sizeof(in6));
2125 if (IN6_IS_ADDR_V4MAPPED(&in6)) {
2135 nn = strlen(bp) + 1; /* for the \0 */
2139 /* don't overwrite pai */
2141 ai.ai_family = (type == T_A) ? AF_INET : AF_INET6;
2142 afd = find_afd(ai.ai_family);
2147 cur->ai_next = get_ai(&ai, afd, (const char *)cp);
2148 if (cur->ai_next == NULL)
2150 while (cur && cur->ai_next)
2161 #if defined(RESOLVSORT)
2163 * We support only IPv4 address for backward
2164 * compatibility against gethostbyname(3).
2166 if (res->nsort && qtype == T_A) {
2167 if (addr4sort(&sentinel, res) < 0) {
2168 freeaddrinfo(sentinel.ai_next);
2169 RES_SET_H_ERRNO(res, NO_RECOVERY);
2173 #endif /*RESOLVSORT*/
2175 (void)get_canonname(pai, sentinel.ai_next, qname);
2177 (void)get_canonname(pai, sentinel.ai_next, canonname);
2178 RES_SET_H_ERRNO(res, NETDB_SUCCESS);
2179 return sentinel.ai_next;
2183 * We could have walked a CNAME chain, but the ultimate target
2184 * may not have what we looked for.
2186 RES_SET_H_ERRNO(res, ntohs(hp->ancount) > 0 ? NO_DATA : NO_RECOVERY);
2192 struct addrinfo *ai;
2197 addr4sort(struct addrinfo *sentinel, res_state res)
2199 struct addrinfo *ai;
2200 struct addr_ptr *addrs, addr;
2201 struct sockaddr_in *sin;
2208 for (ai = sentinel->ai_next; ai; ai = ai->ai_next)
2211 return 0; /* We don't need sorting. */
2212 if ((addrs = malloc(sizeof(struct addr_ptr) * naddrs)) == NULL)
2215 for (ai = sentinel->ai_next; ai; ai = ai->ai_next) {
2216 sin = (struct sockaddr_in *)ai->ai_addr;
2217 for (j = 0; (unsigned)j < res->nsort; j++) {
2218 if (res->sort_list[j].addr.s_addr ==
2219 (sin->sin_addr.s_addr & res->sort_list[j].mask))
2224 if (needsort == 0 && i > 0 && j < addrs[i - 1].aval)
2233 while (needsort < naddrs) {
2234 for (j = needsort - 1; j >= 0; j--) {
2235 if (addrs[j].aval > addrs[j+1].aval) {
2237 addrs[j] = addrs[j + 1];
2238 addrs[j + 1] = addr;
2246 for (i = 0; i < naddrs; ++i) {
2247 ai->ai_next = addrs[i].ai;
2254 #endif /*RESOLVSORT*/
2258 _dns_getaddrinfo(void *rv, void *cb_data, va_list ap)
2260 struct addrinfo *ai, ai0;
2261 querybuf *buf, *buf2;
2262 const char *hostname;
2263 const struct addrinfo *pai;
2264 struct addrinfo sentinel, *cur;
2265 struct res_target q, q2;
2270 hostname = va_arg(ap, char *);
2271 pai = va_arg(ap, const struct addrinfo *);
2273 memset(&q, 0, sizeof(q));
2274 memset(&q2, 0, sizeof(q2));
2275 memset(&sentinel, 0, sizeof(sentinel));
2278 res = __res_state();
2280 buf = malloc(sizeof(*buf));
2282 RES_SET_H_ERRNO(res, NETDB_INTERNAL);
2285 buf2 = malloc(sizeof(*buf2));
2288 RES_SET_H_ERRNO(res, NETDB_INTERNAL);
2292 if (pai->ai_family == AF_INET6 &&
2293 (pai->ai_flags & AI_V4MAPPED) == AI_V4MAPPED) {
2295 ai0.ai_family = AF_UNSPEC;
2299 switch (pai->ai_family) {
2304 q.answer = buf->buf;
2305 q.anslen = sizeof(buf->buf);
2310 q2.answer = buf2->buf;
2311 q2.anslen = sizeof(buf2->buf);
2317 q.answer = buf->buf;
2318 q.anslen = sizeof(buf->buf);
2324 q.answer = buf->buf;
2325 q.anslen = sizeof(buf->buf);
2333 if ((res->options & RES_INIT) == 0 && res_ninit(res) == -1) {
2334 RES_SET_H_ERRNO(res, NETDB_INTERNAL);
2340 if (res_searchN(hostname, &q, res) < 0) {
2347 ai = getanswer(buf2, q2.n, q2.name, q2.qtype, pai, res);
2350 while (cur && cur->ai_next)
2354 if (ai == NULL || pai->ai_family != AF_UNSPEC ||
2355 (pai->ai_flags & (AI_ALL | AI_V4MAPPED)) != AI_V4MAPPED) {
2356 ai = getanswer(buf, q.n, q.name, q.qtype, pai, res);
2362 if (sentinel.ai_next == NULL)
2363 switch (res->res_h_errno) {
2364 case HOST_NOT_FOUND:
2372 *((struct addrinfo **)rv) = sentinel.ai_next;
2377 _sethtent(FILE **hostf)
2380 *hostf = fopen(_PATH_HOSTS, "re");
2386 _endhtent(FILE **hostf)
2389 (void) fclose(*hostf);
2394 static struct addrinfo *
2395 _gethtent(FILE **hostf, const char *name, const struct addrinfo *pai)
2398 char *cp, *tname, *cname;
2399 struct addrinfo hints, *res0, *res;
2402 char hostbuf[8*1024];
2404 if (!*hostf && !(*hostf = fopen(_PATH_HOSTS, "re")))
2407 if (!(p = fgets(hostbuf, sizeof hostbuf, *hostf)))
2411 cp = strpbrk(p, "#\n");
2414 if (!(cp = strpbrk(p, " \t")))
2419 /* if this is not something we're looking for, skip it. */
2421 if (*cp == ' ' || *cp == '\t') {
2428 if ((cp = strpbrk(cp, " \t")) != NULL)
2430 if (strcasecmp(name, tname) == 0)
2436 /* we should not glob socktype/protocol here */
2437 memset(&hints, 0, sizeof(hints));
2438 hints.ai_family = pai->ai_family;
2439 hints.ai_socktype = SOCK_DGRAM;
2440 hints.ai_protocol = 0;
2441 hints.ai_flags = AI_NUMERICHOST;
2442 if (pai->ai_family == AF_INET6 &&
2443 (pai->ai_flags & AI_V4MAPPED) == AI_V4MAPPED)
2444 hints.ai_flags |= AI_V4MAPPED;
2445 error = getaddrinfo(addr, "0", &hints, &res0);
2448 #ifdef FILTER_V4MAPPED
2449 /* XXX should check all items in the chain */
2450 if (res0->ai_family == AF_INET6 &&
2451 IN6_IS_ADDR_V4MAPPED(&((struct sockaddr_in6 *)res0->ai_addr)->sin6_addr)) {
2456 for (res = res0; res; res = res->ai_next) {
2458 res->ai_flags = pai->ai_flags;
2459 res->ai_socktype = pai->ai_socktype;
2460 res->ai_protocol = pai->ai_protocol;
2462 if (pai->ai_flags & AI_CANONNAME) {
2463 if (get_canonname(pai, res, cname) != 0) {
2472 static struct addrinfo *
2473 _getht(FILE **hostf, const char *name, const struct addrinfo *pai,
2474 struct addrinfo *cur)
2478 while ((p = _gethtent(hostf, name, pai)) != NULL) {
2480 while (cur && cur->ai_next)
2488 _files_getaddrinfo(void *rv, void *cb_data, va_list ap)
2491 const struct addrinfo *pai;
2492 struct addrinfo sentinel, *cur;
2495 name = va_arg(ap, char *);
2496 pai = va_arg(ap, struct addrinfo *);
2498 memset(&sentinel, 0, sizeof(sentinel));
2502 if (pai->ai_family == AF_INET6 &&
2503 (pai->ai_flags & (AI_ALL | AI_V4MAPPED)) == AI_V4MAPPED) {
2504 struct addrinfo ai0 = *pai;
2506 ai0.ai_flags &= ~AI_V4MAPPED;
2507 cur = _getht(&hostf, name, &ai0, cur);
2508 if (sentinel.ai_next == NULL) {
2510 ai0.ai_flags |= AI_V4MAPPED;
2511 cur = _getht(&hostf, name, &ai0, cur);
2514 cur = _getht(&hostf, name, pai, cur);
2517 *((struct addrinfo **)rv) = sentinel.ai_next;
2518 if (sentinel.ai_next == NULL)
2525 static struct addrinfo *
2526 _yphostent(char *line, const struct addrinfo *pai)
2528 struct addrinfo sentinel, *cur;
2529 struct addrinfo hints, *res, *res0;
2532 const char *addr, *canonname;
2536 addr = canonname = NULL;
2538 memset(&sentinel, 0, sizeof(sentinel));
2542 /* terminate line */
2543 cp = strchr(p, '\n');
2550 cp = strpbrk(p, " \t");
2552 if (canonname == NULL)
2562 if (*cp == ' ' || *cp == '\t') {
2568 if ((cp = strpbrk(cp, " \t")) != NULL)
2573 hints.ai_flags = AI_NUMERICHOST;
2574 if (pai->ai_family == AF_INET6 &&
2575 (pai->ai_flags & AI_V4MAPPED) == AI_V4MAPPED)
2576 hints.ai_flags |= AI_V4MAPPED;
2577 error = getaddrinfo(addr, NULL, &hints, &res0);
2579 for (res = res0; res; res = res->ai_next) {
2581 res->ai_flags = pai->ai_flags;
2583 if (pai->ai_flags & AI_CANONNAME)
2584 (void)get_canonname(pai, res, canonname);
2589 cur->ai_next = res0;
2590 while (cur && cur->ai_next)
2600 return sentinel.ai_next;
2605 _yp_getaddrinfo(void *rv, void *cb_data, va_list ap)
2607 struct addrinfo sentinel, *cur;
2608 struct addrinfo *ai = NULL;
2612 const struct addrinfo *pai;
2615 if (_yp_check(&ypdomain) == 0)
2618 name = va_arg(ap, char *);
2619 pai = va_arg(ap, const struct addrinfo *);
2621 memset(&sentinel, 0, sizeof(sentinel));
2624 /* ipnodes.byname can hold both IPv4/v6 */
2625 r = yp_match(ypdomain, "ipnodes.byname", name,
2626 (int)strlen(name), &ypbuf, &ypbuflen);
2628 ai = _yphostent(ypbuf, pai);
2631 while (cur && cur->ai_next)
2638 struct sockaddr_in6 *sin6;
2640 switch (ai->ai_family) {
2644 sin6 = (struct sockaddr_in6 *)ai->ai_addr;
2645 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr))
2651 /* hosts.byname is only for IPv4 (Solaris8) */
2652 if (pai->ai_family == AF_UNSPEC || pai->ai_family == AF_INET ||
2653 ((pai->ai_family == AF_INET6 &&
2654 (pai->ai_flags & AI_V4MAPPED) == AI_V4MAPPED) &&
2655 (ai == NULL || (pai->ai_flags & AI_ALL) == AI_ALL))) {
2656 r = yp_match(ypdomain, "hosts.byname", name,
2657 (int)strlen(name), &ypbuf, &ypbuflen);
2659 struct addrinfo ai4;
2662 if (pai->ai_family == AF_UNSPEC)
2663 ai4.ai_family = AF_INET;
2664 ai = _yphostent(ypbuf, &ai4);
2667 while (cur && cur->ai_next)
2675 if (sentinel.ai_next == NULL) {
2676 RES_SET_H_ERRNO(__res_state(), HOST_NOT_FOUND);
2679 *((struct addrinfo **)rv) = sentinel.ai_next;
2684 /* resolver logic */
2687 * Formulate a normal query, send, and await answer.
2688 * Returned answer is placed in supplied buffer "answer".
2689 * Perform preliminary check of answer, returning success only
2690 * if no error is indicated and the answer count is nonzero.
2691 * Return the size of the response on success, -1 on error.
2692 * Error number is left in h_errno.
2694 * Caller must parse answer and determine whether it answers the question.
2697 res_queryN(const char *name, struct res_target *target, res_state res)
2703 struct res_target *t;
2710 buf = malloc(MAXPACKET);
2712 RES_SET_H_ERRNO(res, NETDB_INTERNAL);
2716 for (t = target; t; t = t->next) {
2721 hp = (HEADER *)(void *)t->answer;
2723 /* make it easier... */
2729 oflags = res->_flags;
2732 hp->rcode = NOERROR; /* default */
2735 if (res->options & RES_DEBUG)
2736 printf(";; res_query(%s, %d, %d)\n", name, class, type);
2739 n = res_nmkquery(res, QUERY, name, class, type, NULL, 0, NULL,
2741 if (n > 0 && (res->_flags & RES_F_EDNS0ERR) == 0 &&
2742 (res->options & (RES_USE_EDNS0|RES_USE_DNSSEC)) != 0U)
2743 n = res_nopt(res, n, buf, MAXPACKET, anslen);
2746 if (res->options & RES_DEBUG)
2747 printf(";; res_query: mkquery failed\n");
2750 RES_SET_H_ERRNO(res, NO_RECOVERY);
2753 n = res_nsend(res, buf, n, answer, anslen);
2756 * if the query choked with EDNS0, retry
2759 if ((res->options & (RES_USE_EDNS0|RES_USE_DNSSEC))
2761 ((oflags ^ res->_flags) & RES_F_EDNS0ERR) != 0) {
2762 res->_flags |= RES_F_EDNS0ERR;
2763 if (res->options & RES_DEBUG)
2764 printf(";; res_nquery: retry without EDNS0\n");
2767 rcode = hp->rcode; /* record most recent error */
2769 if (res->options & RES_DEBUG)
2770 printf(";; res_query: send error\n");
2776 hp->rcode = FORMERR; /* XXX not very informative */
2777 if (hp->rcode != NOERROR || ntohs(hp->ancount) == 0) {
2778 rcode = hp->rcode; /* record most recent error */
2780 if (res->options & RES_DEBUG)
2781 printf(";; rcode = %u, ancount=%u\n", hp->rcode,
2782 ntohs(hp->ancount));
2787 ancount += ntohs(hp->ancount);
2797 RES_SET_H_ERRNO(res, HOST_NOT_FOUND);
2800 RES_SET_H_ERRNO(res, TRY_AGAIN);
2803 RES_SET_H_ERRNO(res, NO_DATA);
2809 RES_SET_H_ERRNO(res, NO_RECOVERY);
2818 * Formulate a normal query, send, and retrieve answer in supplied buffer.
2819 * Return the size of the response on success, -1 on error.
2820 * If enabled, implement search rules until answer or unrecoverable failure
2821 * is detected. Error code, if any, is left in h_errno.
2824 res_searchN(const char *name, struct res_target *target, res_state res)
2826 const char *cp, * const *domain;
2827 HEADER *hp = (HEADER *)(void *)target->answer; /*XXX*/
2829 int trailing_dot, ret, saved_herrno;
2830 int got_nodata = 0, got_servfail = 0, root_on_list = 0;
2831 int tried_as_is = 0;
2833 char abuf[MAXDNAME];
2836 RES_SET_H_ERRNO(res, HOST_NOT_FOUND); /* default, if we never query */
2838 for (cp = name; *cp; cp++)
2839 dots += (*cp == '.');
2841 if (cp > name && *--cp == '.')
2845 * if there aren't any dots, it could be a user-level alias
2848 (cp = res_hostalias(res, name, abuf, sizeof(abuf))) != NULL)
2849 return (res_queryN(cp, target, res));
2852 * If there are enough dots in the name, let's just give it a
2853 * try 'as is'. The threshold can be set with the "ndots" option.
2854 * Also, query 'as is', if there is a trailing dot in the name.
2857 if (dots >= res->ndots || trailing_dot) {
2858 ret = res_querydomainN(name, NULL, target, res);
2859 if (ret > 0 || trailing_dot)
2861 if (errno == ECONNREFUSED) {
2862 RES_SET_H_ERRNO(res, TRY_AGAIN);
2865 switch (res->res_h_errno) {
2867 case HOST_NOT_FOUND:
2870 if (hp->rcode == SERVFAIL)
2876 saved_herrno = res->res_h_errno;
2881 * We do at least one level of search if
2882 * - there is no dot and RES_DEFNAME is set, or
2883 * - there is at least one dot, there is no trailing dot,
2884 * and RES_DNSRCH is set.
2886 if ((!dots && (res->options & RES_DEFNAMES)) ||
2887 (dots && !trailing_dot && (res->options & RES_DNSRCH))) {
2890 for (domain = (const char * const *)res->dnsrch;
2895 if (domain[0][0] == '\0' ||
2896 (domain[0][0] == '.' && domain[0][1] == '\0'))
2899 if (root_on_list && tried_as_is)
2902 ret = res_querydomainN(name, *domain, target, res);
2907 * If no server present, give up.
2908 * If name isn't found in this domain,
2909 * keep trying higher domains in the search list
2910 * (if that's enabled).
2911 * On a NO_DATA error, keep trying, otherwise
2912 * a wildcard entry of another type could keep us
2913 * from finding this entry higher in the domain.
2914 * If we get some other error (negative answer or
2915 * server failure), then stop searching up,
2916 * but try the input name below in case it's
2919 if (errno == ECONNREFUSED) {
2920 RES_SET_H_ERRNO(res, TRY_AGAIN);
2924 switch (res->res_h_errno) {
2928 case HOST_NOT_FOUND:
2933 if (hp->rcode == SERVFAIL) {
2934 /* try next search element, if any */
2939 /* anything else implies that we're done */
2943 * if we got here for some reason other than DNSRCH,
2944 * we only wanted one iteration of the loop, so stop.
2946 if (!(res->options & RES_DNSRCH))
2951 switch (res->res_h_errno) {
2953 case HOST_NOT_FOUND:
2956 if (hp->rcode == SERVFAIL)
2964 * If the query has not already been tried as is then try it
2965 * unless RES_NOTLDQUERY is set and there were no dots.
2967 if ((dots || !searched || !(res->options & RES_NOTLDQUERY)) &&
2968 !(tried_as_is || root_on_list)) {
2969 ret = res_querydomainN(name, NULL, target, res);
2975 * if we got here, we didn't satisfy the search.
2976 * if we did an initial full query, return that query's h_errno
2977 * (note that we wouldn't be here if that query had succeeded).
2978 * else if we ever got a nodata, send that back as the reason.
2979 * else send back meaningless h_errno, that being the one from
2980 * the last DNSRCH we did.
2983 if (saved_herrno != -1)
2984 RES_SET_H_ERRNO(res, saved_herrno);
2985 else if (got_nodata)
2986 RES_SET_H_ERRNO(res, NO_DATA);
2987 else if (got_servfail)
2988 RES_SET_H_ERRNO(res, TRY_AGAIN);
2993 * Perform a call on res_query on the concatenation of name and domain,
2994 * removing a trailing dot from name if domain is NULL.
2997 res_querydomainN(const char *name, const char *domain,
2998 struct res_target *target, res_state res)
3000 char nbuf[MAXDNAME];
3001 const char *longname = nbuf;
3005 if (res->options & RES_DEBUG)
3006 printf(";; res_querydomain(%s, %s)\n",
3007 name, domain?domain:"<Nil>");
3009 if (domain == NULL) {
3011 * Check for trailing '.';
3012 * copy without '.' if present.
3015 if (n >= MAXDNAME) {
3016 RES_SET_H_ERRNO(res, NO_RECOVERY);
3019 if (n > 0 && name[--n] == '.') {
3020 strncpy(nbuf, name, n);
3027 if (n + d + 1 >= MAXDNAME) {
3028 RES_SET_H_ERRNO(res, NO_RECOVERY);
3031 snprintf(nbuf, sizeof(nbuf), "%s.%s", name, domain);
3033 return (res_queryN(longname, target, res));