1 /* $KAME: getaddrinfo.c,v 1.15 2000/07/09 04:37:24 itojun Exp $ */
4 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the project nor the names of its contributors
16 * may be used to endorse or promote products derived from this software
17 * without specific prior written permission.
19 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 * "#ifdef FAITH" part is local hack for supporting IPv4-v6 translator.
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 - SEGV on freeaddrinfo(NULL)
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/types.h>
61 #include <sys/param.h>
62 #include <sys/socket.h>
64 #include <netinet/in.h>
65 #include <net/if_types.h>
67 #include <sys/queue.h>
69 #include <net/if_var.h>
70 #include <sys/sysctl.h>
71 #include <sys/ioctl.h>
72 #include <netinet6/in6_var.h>
73 #include <netinet6/nd6.h>
75 #include <arpa/inet.h>
76 #include <arpa/nameser.h>
78 #include <rpcsvc/yp_prot.h>
79 #include <rpcsvc/ypclnt.h>
90 #include "res_config.h"
98 #include "un-namespace.h"
99 #include "netdb_private.h"
100 #include "libc_private.h"
105 #if defined(__KAME__) && defined(INET6)
113 static const char in_addrany[] = { 0, 0, 0, 0 };
114 static const char in_loopback[] = { 127, 0, 0, 1 };
116 static const char in6_addrany[] = {
117 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
119 static const char in6_loopback[] = {
120 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1
125 TAILQ_ENTRY(policyqueue) pc_entry;
127 struct in6_addrpolicy pc_policy;
130 TAILQ_HEAD(policyhead, policyqueue);
132 static const struct afd {
137 const char *a_addrany;
138 const char *a_loopback;
143 {PF_INET6, sizeof(struct in6_addr),
144 sizeof(struct sockaddr_in6),
145 offsetof(struct sockaddr_in6, sin6_addr),
146 in6_addrany, in6_loopback, 1},
151 {PF_INET, sizeof(struct in_addr),
152 sizeof(struct sockaddr_in),
153 offsetof(struct sockaddr_in, sin_addr),
154 in_addrany, in_loopback, 0},
155 {0, 0, 0, 0, NULL, NULL, 0},
163 #define WILD_AF(ex) ((ex)->e_wild & 0x01)
164 #define WILD_SOCKTYPE(ex) ((ex)->e_wild & 0x02)
165 #define WILD_PROTOCOL(ex) ((ex)->e_wild & 0x04)
168 static const struct explore explore[] = {
170 { PF_LOCAL, ANY, ANY, 0x01 },
173 { PF_INET6, SOCK_DGRAM, IPPROTO_UDP, 0x07 },
174 { PF_INET6, SOCK_STREAM, IPPROTO_TCP, 0x07 },
175 { PF_INET6, SOCK_STREAM, IPPROTO_SCTP, 0x03 },
176 { PF_INET6, SOCK_SEQPACKET, IPPROTO_SCTP, 0x07 },
177 { PF_INET6, SOCK_DGRAM, IPPROTO_UDPLITE, 0x03 },
178 { PF_INET6, SOCK_RAW, ANY, 0x05 },
180 { PF_INET, SOCK_DGRAM, IPPROTO_UDP, 0x07 },
181 { PF_INET, SOCK_STREAM, IPPROTO_TCP, 0x07 },
182 { PF_INET, SOCK_STREAM, IPPROTO_SCTP, 0x03 },
183 { PF_INET, SOCK_SEQPACKET, IPPROTO_SCTP, 0x07 },
184 { PF_INET, SOCK_DGRAM, IPPROTO_UDPLITE, 0x03 },
185 { PF_INET, SOCK_RAW, ANY, 0x05 },
195 #define AIO_SRCFLAG_DEPRECATED 0x1
199 struct sockaddr_storage aiou_ss;
200 struct sockaddr aiou_sa;
202 #define aio_srcsa aio_src_un.aiou_sa
203 u_int32_t aio_srcflag;
206 struct policyqueue *aio_srcpolicy;
207 struct policyqueue *aio_dstpolicy;
208 struct addrinfo *aio_ai;
210 int aio_initial_sequence;
213 static const ns_src default_dns_files[] = {
214 { NSSRC_FILES, NS_SUCCESS },
215 { NSSRC_DNS, NS_SUCCESS },
220 struct res_target *next;
221 const char *name; /* domain name */
222 int qclass, qtype; /* class and type of query */
223 u_char *answer; /* buffer to put answer */
224 int anslen; /* size of answer buffer */
225 int n; /* result length */
228 #define MAXPACKET (64*1024)
232 u_char buf[MAXPACKET];
235 static int str2number(const char *, int *);
236 static int explore_copy(const struct addrinfo *, const struct addrinfo *,
238 static int explore_null(const struct addrinfo *,
239 const char *, struct addrinfo **);
240 static int explore_numeric(const struct addrinfo *, const char *,
241 const char *, struct addrinfo **, const char *);
242 static int explore_numeric_scope(const struct addrinfo *, const char *,
243 const char *, struct addrinfo **);
244 static int get_canonname(const struct addrinfo *,
245 struct addrinfo *, const char *);
246 static struct addrinfo *get_ai(const struct addrinfo *,
247 const struct afd *, const char *);
248 static struct addrinfo *copy_ai(const struct addrinfo *);
249 static int get_portmatch(const struct addrinfo *, const char *);
250 static int get_port(struct addrinfo *, const char *, int);
251 static const struct afd *find_afd(int);
252 static int addrconfig(struct addrinfo *);
254 static int is_ifdisabled(char *);
256 static void set_source(struct ai_order *, struct policyhead *);
257 static int comp_dst(const void *, const void *);
259 static int ip6_str2scopeid(char *, struct sockaddr_in6 *, u_int32_t *);
261 static int gai_addr2scopetype(struct sockaddr *);
263 static int explore_fqdn(const struct addrinfo *, const char *,
264 const char *, struct addrinfo **);
266 static int reorder(struct addrinfo *);
267 static int get_addrselectpolicy(struct policyhead *);
268 static void free_addrselectpolicy(struct policyhead *);
269 static struct policyqueue *match_addrselectpolicy(struct sockaddr *,
270 struct policyhead *);
271 static int matchlen(struct sockaddr *, struct sockaddr *);
273 static struct addrinfo *getanswer(const querybuf *, int, const char *, int,
274 const struct addrinfo *, res_state);
275 #if defined(RESOLVSORT)
276 static int addr4sort(struct addrinfo *, res_state);
278 static int _dns_getaddrinfo(void *, void *, va_list);
279 static void _sethtent(FILE **);
280 static void _endhtent(FILE **);
281 static struct addrinfo *_gethtent(FILE **, const char *,
282 const struct addrinfo *);
283 static int _files_getaddrinfo(void *, void *, va_list);
285 static struct addrinfo *_yphostent(char *, const struct addrinfo *);
286 static int _yp_getaddrinfo(void *, void *, va_list);
289 static int addrinfo_id_func(char *, size_t *, va_list, void *);
290 static int addrinfo_marshal_func(char *, size_t *, void *, va_list, void *);
291 static int addrinfo_unmarshal_func(char *, size_t, void *, va_list, void *);
294 static int res_queryN(const char *, struct res_target *, res_state);
295 static int res_searchN(const char *, struct res_target *, res_state);
296 static int res_querydomainN(const char *, const char *,
297 struct res_target *, res_state);
299 /* XXX macros that make external reference is BAD. */
301 #define GET_AI(ai, afd, addr) \
303 /* external reference: pai, error, and label free */ \
304 (ai) = get_ai(pai, (afd), (addr)); \
305 if ((ai) == NULL) { \
306 error = EAI_MEMORY; \
309 } while (/*CONSTCOND*/0)
311 #define GET_PORT(ai, serv) \
313 /* external reference: error and label free */ \
314 error = get_port((ai), (serv), 0); \
317 } while (/*CONSTCOND*/0)
319 #define GET_CANONNAME(ai, str) \
321 /* external reference: pai, error and label free */ \
322 error = get_canonname(pai, (ai), (str)); \
325 } while (/*CONSTCOND*/0)
329 /* external reference: error, and label bad */ \
333 } while (/*CONSTCOND*/0)
335 #define MATCH_FAMILY(x, y, w) \
336 ((x) == (y) || (/*CONSTCOND*/(w) && ((x) == PF_UNSPEC || (y) == PF_UNSPEC)))
337 #define MATCH(x, y, w) \
338 ((x) == (y) || (/*CONSTCOND*/(w) && ((x) == ANY || (y) == ANY)))
341 freeaddrinfo(struct addrinfo *ai)
343 struct addrinfo *next;
347 if (ai->ai_canonname)
348 free(ai->ai_canonname);
349 /* no need to free(ai->ai_addr) */
356 str2number(const char *p, int *portp)
365 v = strtoul(p, &ep, 10);
366 if (errno == 0 && ep && *ep == '\0' && v <= UINT_MAX) {
374 getaddrinfo(const char *hostname, const char *servname,
375 const struct addrinfo *hints, struct addrinfo **res)
377 struct addrinfo sentinel;
378 struct addrinfo *cur;
380 struct addrinfo ai, ai0, *afai;
381 struct addrinfo *pai;
382 const struct afd *afd;
383 const struct explore *ex;
384 struct addrinfo *afailist[sizeof(afdl)/sizeof(afdl[0])];
385 struct addrinfo *afai_unspec;
389 /* ensure we return NULL on errors */
392 memset(&ai, 0, sizeof(ai));
394 memset(afailist, 0, sizeof(afailist));
397 memset(&sentinel, 0, sizeof(sentinel));
401 pai->ai_family = PF_UNSPEC;
402 pai->ai_socktype = ANY;
403 pai->ai_protocol = ANY;
405 pai->ai_canonname = NULL;
409 if (hostname == NULL && servname == NULL)
412 /* error check for hints */
413 if (hints->ai_addrlen || hints->ai_canonname ||
414 hints->ai_addr || hints->ai_next)
415 ERR(EAI_BADHINTS); /* xxx */
416 if (hints->ai_flags & ~AI_MASK)
418 switch (hints->ai_family) {
428 memcpy(pai, hints, sizeof(*pai));
431 * if both socktype/protocol are specified, check if they
432 * are meaningful combination.
434 if (pai->ai_socktype != ANY && pai->ai_protocol != ANY) {
435 for (ex = explore; ex->e_af >= 0; ex++) {
436 if (!MATCH_FAMILY(pai->ai_family, ex->e_af,
439 if (!MATCH(pai->ai_socktype, ex->e_socktype,
442 if (!MATCH(pai->ai_protocol, ex->e_protocol,
456 * RFC 3493: AI_ALL and AI_V4MAPPED are effective only against
457 * AF_INET6 query. They need to be ignored if specified in other
460 switch (pai->ai_flags & (AI_ALL | AI_V4MAPPED)) {
462 case AI_ALL | AI_V4MAPPED:
464 if (pai->ai_family != AF_INET6)
465 pai->ai_flags &= ~(AI_ALL | AI_V4MAPPED);
469 pai->ai_flags &= ~(AI_ALL | AI_V4MAPPED);
474 * check for special cases. (1) numeric servname is disallowed if
475 * socktype/protocol are left unspecified. (2) servname is disallowed
476 * for raw and other inet{,6} sockets.
478 if (MATCH_FAMILY(pai->ai_family, PF_INET, 1)
480 || MATCH_FAMILY(pai->ai_family, PF_INET6, 1)
483 ai0 = *pai; /* backup *pai */
485 if (pai->ai_family == PF_UNSPEC) {
487 pai->ai_family = PF_INET6;
489 pai->ai_family = PF_INET;
492 error = get_portmatch(pai, servname);
502 * NULL hostname, or numeric hostname.
503 * If numeric representation of AF1 can be interpreted as FQDN
504 * representation of AF2, we need to think again about the code below.
507 for (afd = afdl; afd->a_af; afd++) {
510 if (!MATCH_FAMILY(pai->ai_family, afd->a_af, 1))
513 if (pai->ai_family == PF_UNSPEC)
514 pai->ai_family = afd->a_af;
516 if (hostname == NULL) {
517 error = explore_null(pai, servname,
518 &afailist[afd - afdl]);
521 * Errors from explore_null should be unexpected and
522 * be caught to avoid returning an incomplete result.
527 error = explore_numeric_scope(pai, hostname, servname,
528 &afailist[afd - afdl]);
531 * explore_numeric_scope returns an error for address
532 * families that do not match that of hostname.
533 * Thus we should not catch the error at this moment.
537 if (!error && afailist[afd - afdl])
545 if (hostname == NULL)
546 ERR(EAI_NONAME); /* used to be EAI_NODATA */
547 if (pai->ai_flags & AI_NUMERICHOST)
550 if ((pai->ai_flags & AI_ADDRCONFIG) != 0 && !addrconfig(&ai0))
554 * hostname as alphabetical name.
557 error = explore_fqdn(pai, hostname, servname, &afai_unspec);
560 for (ex = explore; ex->e_af >= 0; ex++) {
563 if (!MATCH_FAMILY(pai->ai_family, ex->e_af, WILD_AF(ex)))
565 if (!MATCH(pai->ai_socktype, ex->e_socktype,
568 if (!MATCH(pai->ai_protocol, ex->e_protocol,
572 if (pai->ai_family == PF_UNSPEC)
573 pai->ai_family = ex->e_af;
574 if (pai->ai_socktype == ANY && ex->e_socktype != ANY)
575 pai->ai_socktype = ex->e_socktype;
576 if (pai->ai_protocol == ANY && ex->e_protocol != ANY)
577 pai->ai_protocol = ex->e_protocol;
580 * if the servname does not match socktype/protocol, ignore it.
582 if (get_portmatch(pai, servname) != 0)
588 if ((afd = find_afd(pai->ai_family)) == NULL)
590 /* XXX assumes that afd points inside afdl[] */
591 afai = afailist[afd - afdl];
596 error = explore_copy(pai, afai, &cur->ai_next);
600 while (cur && cur->ai_next)
605 * ensure we return either:
606 * - error == 0, non-NULL *res
607 * - error != 0, NULL *res
610 if (sentinel.ai_next) {
612 * If the returned entry is for an active connection,
613 * and the given name is not numeric, reorder the
614 * list, so that the application would try the list
615 * in the most efficient order. Since the head entry
616 * of the original list may contain ai_canonname and
617 * that entry may be moved elsewhere in the new list,
618 * we keep the pointer and will restore it in the new
619 * head entry. (Note that RFC3493 requires the head
620 * entry store it when requested by the caller).
622 if (hints == NULL || !(hints->ai_flags & AI_PASSIVE)) {
627 sentinel.ai_next->ai_canonname;
628 sentinel.ai_next->ai_canonname = NULL;
629 (void)reorder(&sentinel);
630 if (sentinel.ai_next->ai_canonname ==
632 sentinel.ai_next->ai_canonname
634 } else if (canonname != NULL)
638 *res = sentinel.ai_next;
645 freeaddrinfo(afai_unspec);
646 for (afd = afdl; afd->a_af; afd++) {
647 if (afailist[afd - afdl])
648 freeaddrinfo(afailist[afd - afdl]);
651 if (sentinel.ai_next)
652 freeaddrinfo(sentinel.ai_next);
658 reorder(struct addrinfo *sentinel)
660 struct addrinfo *ai, **aip;
661 struct ai_order *aio;
663 struct policyhead policyhead;
665 /* count the number of addrinfo elements for sorting. */
666 for (n = 0, ai = sentinel->ai_next; ai != NULL; ai = ai->ai_next, n++)
670 * If the number is small enough, we can skip the reordering process.
675 /* allocate a temporary array for sort and initialization of it. */
676 if ((aio = calloc(n, sizeof(*aio))) == NULL)
677 return(n); /* give up reordering */
679 /* retrieve address selection policy from the kernel */
680 TAILQ_INIT(&policyhead);
681 if (!get_addrselectpolicy(&policyhead)) {
682 /* no policy is installed into kernel, we don't sort. */
687 for (i = 0, ai = sentinel->ai_next; i < n; ai = ai->ai_next, i++) {
689 aio[i].aio_dstscope = gai_addr2scopetype(ai->ai_addr);
690 aio[i].aio_dstpolicy = match_addrselectpolicy(ai->ai_addr,
692 set_source(&aio[i], &policyhead);
693 aio[i].aio_initial_sequence = i;
696 /* perform sorting. */
697 qsort(aio, n, sizeof(*aio), comp_dst);
699 /* reorder the addrinfo chain. */
700 for (i = 0, aip = &sentinel->ai_next; i < n; i++) {
701 *aip = aio[i].aio_ai;
702 aip = &aio[i].aio_ai->ai_next;
706 /* cleanup and return */
708 free_addrselectpolicy(&policyhead);
713 get_addrselectpolicy(struct policyhead *head)
716 int mib[] = { CTL_NET, PF_INET6, IPPROTO_IPV6, IPV6CTL_ADDRCTLPOLICY };
719 struct in6_addrpolicy *pol, *ep;
721 if (sysctl(mib, sizeof(mib) / sizeof(mib[0]), NULL, &l, NULL, 0) < 0)
725 if ((buf = malloc(l)) == NULL)
727 if (sysctl(mib, sizeof(mib) / sizeof(mib[0]), buf, &l, NULL, 0) < 0) {
732 ep = (struct in6_addrpolicy *)(buf + l);
733 for (pol = (struct in6_addrpolicy *)buf; pol + 1 <= ep; pol++) {
734 struct policyqueue *new;
736 if ((new = malloc(sizeof(*new))) == NULL) {
737 free_addrselectpolicy(head); /* make the list empty */
740 new->pc_policy = *pol;
741 TAILQ_INSERT_TAIL(head, new, pc_entry);
752 free_addrselectpolicy(struct policyhead *head)
754 struct policyqueue *ent, *nent;
756 for (ent = TAILQ_FIRST(head); ent; ent = nent) {
757 nent = TAILQ_NEXT(ent, pc_entry);
758 TAILQ_REMOVE(head, ent, pc_entry);
763 static struct policyqueue *
764 match_addrselectpolicy(struct sockaddr *addr, struct policyhead *head)
767 struct policyqueue *ent, *bestent = NULL;
768 struct in6_addrpolicy *pol;
769 int matchlen, bestmatchlen = -1;
770 u_char *mp, *ep, *k, *p, m;
771 struct sockaddr_in6 key;
773 switch(addr->sa_family) {
775 key = *(struct sockaddr_in6 *)addr;
778 /* convert the address into IPv4-mapped IPv6 address. */
779 memset(&key, 0, sizeof(key));
780 key.sin6_family = AF_INET6;
781 key.sin6_len = sizeof(key);
783 (char *)&((struct sockaddr_in *)addr)->sin_addr,
784 (char *)&key.sin6_addr);
790 for (ent = TAILQ_FIRST(head); ent; ent = TAILQ_NEXT(ent, pc_entry)) {
791 pol = &ent->pc_policy;
794 mp = (u_char *)&pol->addrmask.sin6_addr;
795 ep = mp + 16; /* XXX: scope field? */
796 k = (u_char *)&key.sin6_addr;
797 p = (u_char *)&pol->addr.sin6_addr;
798 for (; mp < ep && *mp; mp++, k++, p++) {
801 goto next; /* not match */
802 if (m == 0xff) /* short cut for a typical case */
812 /* matched. check if this is better than the current best. */
813 if (matchlen > bestmatchlen) {
815 bestmatchlen = matchlen;
830 set_source(struct ai_order *aio, struct policyhead *ph)
832 struct addrinfo ai = *aio->aio_ai;
833 struct sockaddr_storage ss;
837 /* set unspec ("no source is available"), just in case */
838 aio->aio_srcsa.sa_family = AF_UNSPEC;
839 aio->aio_srcscope = -1;
841 switch(ai.ai_family) {
847 default: /* ignore unsupported AFs explicitly */
851 /* XXX: make a dummy addrinfo to call connect() */
852 ai.ai_socktype = SOCK_DGRAM;
853 ai.ai_protocol = IPPROTO_UDP; /* is UDP too specific? */
855 memset(&ss, 0, sizeof(ss));
856 memcpy(&ss, ai.ai_addr, ai.ai_addrlen);
857 ai.ai_addr = (struct sockaddr *)&ss;
858 get_port(&ai, "1", 0);
860 /* open a socket to get the source address for the given dst */
861 if ((s = _socket(ai.ai_family, ai.ai_socktype | SOCK_CLOEXEC,
862 ai.ai_protocol)) < 0)
863 return; /* give up */
865 if (ai.ai_family == AF_INET6) {
866 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)ai.ai_addr;
869 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr))
870 (void)_setsockopt(s, IPPROTO_IPV6, IPV6_V6ONLY,
871 (char *)&off, sizeof(off));
874 if (_connect(s, ai.ai_addr, ai.ai_addrlen) < 0)
876 srclen = ai.ai_addrlen;
877 if (_getsockname(s, &aio->aio_srcsa, &srclen) < 0) {
878 aio->aio_srcsa.sa_family = AF_UNSPEC;
881 aio->aio_srcscope = gai_addr2scopetype(&aio->aio_srcsa);
882 aio->aio_srcpolicy = match_addrselectpolicy(&aio->aio_srcsa, ph);
883 aio->aio_matchlen = matchlen(&aio->aio_srcsa, aio->aio_ai->ai_addr);
885 if (ai.ai_family == AF_INET6) {
886 struct in6_ifreq ifr6;
889 memset(&ifr6, 0, sizeof(ifr6));
890 memcpy(&ifr6.ifr_addr, ai.ai_addr, ai.ai_addrlen);
891 if (_ioctl(s, SIOCGIFAFLAG_IN6, &ifr6) == 0) {
892 flags6 = ifr6.ifr_ifru.ifru_flags6;
893 if ((flags6 & IN6_IFF_DEPRECATED))
894 aio->aio_srcflag |= AIO_SRCFLAG_DEPRECATED;
905 matchlen(struct sockaddr *src, struct sockaddr *dst)
912 switch (src->sa_family) {
915 s = (u_char *)&((struct sockaddr_in6 *)src)->sin6_addr;
916 d = (u_char *)&((struct sockaddr_in6 *)dst)->sin6_addr;
917 addrlen = sizeof(struct in6_addr);
922 s = (u_char *)&((struct sockaddr_in *)src)->sin_addr;
923 d = (u_char *)&((struct sockaddr_in *)dst)->sin_addr;
924 addrlen = sizeof(struct in_addr);
932 if ((r = (*d++ ^ *s++)) != 0) {
933 while ((r & 0x80) == 0) {
944 comp_dst(const void *arg1, const void *arg2)
946 const struct ai_order *dst1 = arg1, *dst2 = arg2;
949 * Rule 1: Avoid unusable destinations.
950 * XXX: we currently do not consider if an appropriate route exists.
952 if (dst1->aio_srcsa.sa_family != AF_UNSPEC &&
953 dst2->aio_srcsa.sa_family == AF_UNSPEC) {
956 if (dst1->aio_srcsa.sa_family == AF_UNSPEC &&
957 dst2->aio_srcsa.sa_family != AF_UNSPEC) {
961 /* Rule 2: Prefer matching scope. */
962 if (dst1->aio_dstscope == dst1->aio_srcscope &&
963 dst2->aio_dstscope != dst2->aio_srcscope) {
966 if (dst1->aio_dstscope != dst1->aio_srcscope &&
967 dst2->aio_dstscope == dst2->aio_srcscope) {
971 /* Rule 3: Avoid deprecated addresses. */
972 if (dst1->aio_srcsa.sa_family != AF_UNSPEC &&
973 dst2->aio_srcsa.sa_family != AF_UNSPEC) {
974 if (!(dst1->aio_srcflag & AIO_SRCFLAG_DEPRECATED) &&
975 (dst2->aio_srcflag & AIO_SRCFLAG_DEPRECATED)) {
978 if ((dst1->aio_srcflag & AIO_SRCFLAG_DEPRECATED) &&
979 !(dst2->aio_srcflag & AIO_SRCFLAG_DEPRECATED)) {
984 /* Rule 4: Prefer home addresses. */
985 /* XXX: not implemented yet */
987 /* Rule 5: Prefer matching label. */
989 if (dst1->aio_srcpolicy && dst1->aio_dstpolicy &&
990 dst1->aio_srcpolicy->pc_policy.label ==
991 dst1->aio_dstpolicy->pc_policy.label &&
992 (dst2->aio_srcpolicy == NULL || dst2->aio_dstpolicy == NULL ||
993 dst2->aio_srcpolicy->pc_policy.label !=
994 dst2->aio_dstpolicy->pc_policy.label)) {
997 if (dst2->aio_srcpolicy && dst2->aio_dstpolicy &&
998 dst2->aio_srcpolicy->pc_policy.label ==
999 dst2->aio_dstpolicy->pc_policy.label &&
1000 (dst1->aio_srcpolicy == NULL || dst1->aio_dstpolicy == NULL ||
1001 dst1->aio_srcpolicy->pc_policy.label !=
1002 dst1->aio_dstpolicy->pc_policy.label)) {
1007 /* Rule 6: Prefer higher precedence. */
1009 if (dst1->aio_dstpolicy &&
1010 (dst2->aio_dstpolicy == NULL ||
1011 dst1->aio_dstpolicy->pc_policy.preced >
1012 dst2->aio_dstpolicy->pc_policy.preced)) {
1015 if (dst2->aio_dstpolicy &&
1016 (dst1->aio_dstpolicy == NULL ||
1017 dst2->aio_dstpolicy->pc_policy.preced >
1018 dst1->aio_dstpolicy->pc_policy.preced)) {
1023 /* Rule 7: Prefer native transport. */
1024 /* XXX: not implemented yet */
1026 /* Rule 8: Prefer smaller scope. */
1027 if (dst1->aio_dstscope >= 0 &&
1028 dst1->aio_dstscope < dst2->aio_dstscope) {
1031 if (dst2->aio_dstscope >= 0 &&
1032 dst2->aio_dstscope < dst1->aio_dstscope) {
1037 * Rule 9: Use longest matching prefix.
1038 * We compare the match length in a same AF only.
1040 if (dst1->aio_ai->ai_addr->sa_family ==
1041 dst2->aio_ai->ai_addr->sa_family &&
1042 dst1->aio_ai->ai_addr->sa_family != AF_INET) {
1043 if (dst1->aio_matchlen > dst2->aio_matchlen) {
1046 if (dst1->aio_matchlen < dst2->aio_matchlen) {
1051 /* Rule 10: Otherwise, leave the order unchanged. */
1054 * Note that qsort is unstable; so, we can't return zero and
1055 * expect the order to be unchanged.
1056 * That also means we can't depend on the current position of
1057 * dst2 being after dst1. We must enforce the initial order
1058 * with an explicit compare on the original position.
1059 * The qsort specification requires that "When the same objects
1060 * (consisting of width bytes, irrespective of their current
1061 * positions in the array) are passed more than once to the
1062 * comparison function, the results shall be consistent with one
1064 * In other words, If A < B, then we must also return B > A.
1066 if (dst2->aio_initial_sequence < dst1->aio_initial_sequence)
1073 * Copy from scope.c.
1074 * XXX: we should standardize the functions and link them as standard
1078 gai_addr2scopetype(struct sockaddr *sa)
1081 struct sockaddr_in6 *sa6;
1083 struct sockaddr_in *sa4;
1085 switch(sa->sa_family) {
1088 sa6 = (struct sockaddr_in6 *)sa;
1089 if (IN6_IS_ADDR_MULTICAST(&sa6->sin6_addr)) {
1090 /* just use the scope field of the multicast address */
1091 return(sa6->sin6_addr.s6_addr[2] & 0x0f);
1094 * Unicast addresses: map scope type to corresponding scope
1095 * value defined for multcast addresses.
1096 * XXX: hardcoded scope type values are bad...
1098 if (IN6_IS_ADDR_LOOPBACK(&sa6->sin6_addr))
1099 return(1); /* node local scope */
1100 if (IN6_IS_ADDR_LINKLOCAL(&sa6->sin6_addr))
1101 return(2); /* link-local scope */
1102 if (IN6_IS_ADDR_SITELOCAL(&sa6->sin6_addr))
1103 return(5); /* site-local scope */
1104 return(14); /* global scope */
1109 * IPv4 pseudo scoping according to RFC 3484.
1111 sa4 = (struct sockaddr_in *)sa;
1112 /* IPv4 autoconfiguration addresses have link-local scope. */
1113 if (((u_char *)&sa4->sin_addr)[0] == 169 &&
1114 ((u_char *)&sa4->sin_addr)[1] == 254)
1116 /* Private addresses have site-local scope. */
1117 if (((u_char *)&sa4->sin_addr)[0] == 10 ||
1118 (((u_char *)&sa4->sin_addr)[0] == 172 &&
1119 (((u_char *)&sa4->sin_addr)[1] & 0xf0) == 16) ||
1120 (((u_char *)&sa4->sin_addr)[0] == 192 &&
1121 ((u_char *)&sa4->sin_addr)[1] == 168))
1122 return(14); /* XXX: It should be 5 unless NAT */
1123 /* Loopback addresses have link-local scope. */
1124 if (((u_char *)&sa4->sin_addr)[0] == 127)
1129 errno = EAFNOSUPPORT; /* is this a good error? */
1135 explore_copy(const struct addrinfo *pai, const struct addrinfo *src0,
1136 struct addrinfo **res)
1139 struct addrinfo sentinel, *cur;
1140 const struct addrinfo *src;
1143 sentinel.ai_next = NULL;
1146 for (src = src0; src != NULL; src = src->ai_next) {
1147 if (src->ai_family != pai->ai_family)
1150 cur->ai_next = copy_ai(src);
1151 if (!cur->ai_next) {
1156 cur->ai_next->ai_socktype = pai->ai_socktype;
1157 cur->ai_next->ai_protocol = pai->ai_protocol;
1161 *res = sentinel.ai_next;
1165 freeaddrinfo(sentinel.ai_next);
1171 * passive socket -> anyaddr (0.0.0.0 or ::)
1172 * non-passive socket -> localhost (127.0.0.1 or ::1)
1175 explore_null(const struct addrinfo *pai, const char *servname,
1176 struct addrinfo **res)
1179 const struct afd *afd;
1180 struct addrinfo *ai;
1187 * filter out AFs that are not supported by the kernel
1190 s = _socket(pai->ai_family, SOCK_DGRAM | SOCK_CLOEXEC, 0);
1192 if (errno != EMFILE)
1197 afd = find_afd(pai->ai_family);
1201 if (pai->ai_flags & AI_PASSIVE) {
1202 GET_AI(ai, afd, afd->a_addrany);
1203 GET_PORT(ai, servname);
1205 GET_AI(ai, afd, afd->a_loopback);
1206 GET_PORT(ai, servname);
1222 explore_numeric(const struct addrinfo *pai, const char *hostname,
1223 const char *servname, struct addrinfo **res, const char *canonname)
1225 const struct afd *afd;
1226 struct addrinfo *ai, ai0;
1228 char pton[PTON_MAX];
1233 afd = find_afd(pai->ai_family);
1237 switch (afd->a_af) {
1240 * RFC3493 requires getaddrinfo() to accept AF_INET formats
1241 * that are accepted by inet_addr() and its family. The
1242 * accepted forms includes the "classful" one, which inet_pton
1243 * does not accept. So we need to separate the case for
1246 if (inet_aton(hostname, (struct in_addr *)pton) != 1 ||
1247 hostname[strspn(hostname, "0123456789.xabcdefXABCDEF")] != '\0')
1251 if (inet_pton(afd->a_af, hostname, pton) != 1) {
1252 if (pai->ai_family != AF_INET6 ||
1253 (pai->ai_flags & AI_V4MAPPED) != AI_V4MAPPED)
1255 if (inet_aton(hostname, (struct in_addr *)pton) != 1)
1257 afd = &afdl[N_INET];
1259 ai0.ai_family = AF_INET;
1265 if (pai->ai_family == afd->a_af) {
1266 GET_AI(ai, afd, pton);
1267 GET_PORT(ai, servname);
1268 if ((pai->ai_flags & AI_CANONNAME)) {
1270 * Set the numeric address itself as the canonical
1271 * name, based on a clarification in RFC3493.
1273 GET_CANONNAME(ai, canonname);
1277 * XXX: This should not happen since we already matched the AF
1294 * numeric hostname with scope
1297 explore_numeric_scope(const struct addrinfo *pai, const char *hostname,
1298 const char *servname, struct addrinfo **res)
1300 #if !defined(SCOPE_DELIMITER) || !defined(INET6)
1301 return explore_numeric(pai, hostname, servname, res, hostname);
1303 const struct afd *afd;
1304 struct addrinfo *cur;
1306 char *cp, *hostname2 = NULL, *scope, *addr;
1307 struct sockaddr_in6 *sin6;
1309 afd = find_afd(pai->ai_family);
1314 return explore_numeric(pai, hostname, servname, res, hostname);
1316 cp = strchr(hostname, SCOPE_DELIMITER);
1318 return explore_numeric(pai, hostname, servname, res, hostname);
1321 * Handle special case of <scoped_address><delimiter><scope id>
1323 hostname2 = strdup(hostname);
1324 if (hostname2 == NULL)
1326 /* terminate at the delimiter */
1327 hostname2[cp - hostname] = '\0';
1331 error = explore_numeric(pai, addr, servname, res, hostname);
1335 for (cur = *res; cur; cur = cur->ai_next) {
1336 if (cur->ai_family != AF_INET6)
1338 sin6 = (struct sockaddr_in6 *)(void *)cur->ai_addr;
1339 if (ip6_str2scopeid(scope, sin6, &scopeid) == -1) {
1343 return(EAI_NONAME); /* XXX: is return OK? */
1345 sin6->sin6_scope_id = scopeid;
1351 if (error && *res) {
1360 get_canonname(const struct addrinfo *pai, struct addrinfo *ai, const char *str)
1362 if ((pai->ai_flags & AI_CANONNAME) != 0) {
1363 ai->ai_canonname = strdup(str);
1364 if (ai->ai_canonname == NULL)
1370 static struct addrinfo *
1371 get_ai(const struct addrinfo *pai, const struct afd *afd, const char *addr)
1374 struct addrinfo *ai;
1376 struct in6_addr faith_prefix;
1381 struct in6_addr mapaddr;
1386 * Transfrom an IPv4 addr into a special IPv6 addr format for
1387 * IPv6->IPv4 translation gateway. (only TCP is supported now)
1389 * +-----------------------------------+------------+
1390 * | faith prefix part (12 bytes) | embedded |
1391 * | | IPv4 addr part (4 bytes)
1392 * +-----------------------------------+------------+
1394 * faith prefix part is specified as ascii IPv6 addr format
1395 * in environmental variable GAI.
1396 * For FAITH to work correctly, routing to faith prefix must be
1397 * setup toward a machine where a FAITH daemon operates.
1398 * Also, the machine must enable some mechanizm
1399 * (e.g. faith interface hack) to divert those packet with
1400 * faith prefixed destination addr to user-land FAITH daemon.
1402 fp_str = getenv("GAI");
1403 if (fp_str && inet_pton(AF_INET6, fp_str, &faith_prefix) == 1 &&
1404 afd->a_af == AF_INET && pai->ai_socktype == SOCK_STREAM) {
1408 memcpy(&v4a, addr, sizeof v4a);
1409 v4a_top = v4a >> IN_CLASSA_NSHIFT;
1410 if (!IN_MULTICAST(v4a) && !IN_EXPERIMENTAL(v4a) &&
1411 v4a_top != 0 && v4a != IN_LOOPBACKNET) {
1412 afd = &afdl[N_INET6];
1413 memcpy(&faith_prefix.s6_addr[12], addr,
1414 sizeof(struct in_addr));
1421 if (afd->a_af == AF_INET && (pai->ai_flags & AI_V4MAPPED) != 0) {
1422 afd = &afdl[N_INET6];
1423 _map_v4v6_address(addr, (char *)&mapaddr);
1424 addr = (char *)&mapaddr;
1428 ai = (struct addrinfo *)malloc(sizeof(struct addrinfo)
1429 + (afd->a_socklen));
1433 memcpy(ai, pai, sizeof(struct addrinfo));
1434 ai->ai_addr = (struct sockaddr *)(void *)(ai + 1);
1435 memset(ai->ai_addr, 0, (size_t)afd->a_socklen);
1436 ai->ai_addr->sa_len = afd->a_socklen;
1437 ai->ai_addrlen = afd->a_socklen;
1438 ai->ai_addr->sa_family = ai->ai_family = afd->a_af;
1439 p = (char *)(void *)(ai->ai_addr);
1442 memcpy(p + afd->a_off, &faith_prefix, (size_t)afd->a_addrlen);
1445 memcpy(p + afd->a_off, addr, (size_t)afd->a_addrlen);
1449 /* XXX need to malloc() the same way we do from other functions! */
1450 static struct addrinfo *
1451 copy_ai(const struct addrinfo *pai)
1453 struct addrinfo *ai;
1456 l = sizeof(*ai) + pai->ai_addrlen;
1457 if ((ai = calloc(1, l)) == NULL)
1459 memcpy(ai, pai, sizeof(*ai));
1460 ai->ai_addr = (struct sockaddr *)(void *)(ai + 1);
1461 memcpy(ai->ai_addr, pai->ai_addr, pai->ai_addrlen);
1463 if (pai->ai_canonname) {
1464 l = strlen(pai->ai_canonname) + 1;
1465 if ((ai->ai_canonname = malloc(l)) == NULL) {
1469 strlcpy(ai->ai_canonname, pai->ai_canonname, l);
1471 /* just to make sure */
1472 ai->ai_canonname = NULL;
1481 get_portmatch(const struct addrinfo *ai, const char *servname)
1484 /* get_port does not touch first argument when matchonly == 1. */
1485 /* LINTED const cast */
1486 return get_port((struct addrinfo *)ai, servname, 1);
1490 get_port(struct addrinfo *ai, const char *servname, int matchonly)
1497 if (servname == NULL)
1499 switch (ai->ai_family) {
1509 switch (ai->ai_socktype) {
1514 case SOCK_SEQPACKET:
1518 switch (ai->ai_family) {
1531 return EAI_SOCKTYPE;
1534 error = str2number(servname, &port);
1538 if (port < 0 || port > 65535)
1542 if (ai->ai_flags & AI_NUMERICSERV)
1545 switch (ai->ai_protocol) {
1555 case IPPROTO_UDPLITE:
1563 if ((sp = getservbyname(servname, proto)) == NULL)
1569 switch (ai->ai_family) {
1571 ((struct sockaddr_in *)(void *)
1572 ai->ai_addr)->sin_port = port;
1576 ((struct sockaddr_in6 *)(void *)
1577 ai->ai_addr)->sin6_port = port;
1586 static const struct afd *
1589 const struct afd *afd;
1591 if (af == PF_UNSPEC)
1593 for (afd = afdl; afd->a_af; afd++) {
1594 if (afd->a_af == af)
1601 * RFC 3493: AI_ADDRCONFIG check. Determines which address families are
1602 * configured on the local system and correlates with pai->ai_family value.
1603 * If an address family is not configured on the system, it will not be
1604 * queried for. For this purpose, loopback addresses are not considered
1605 * configured addresses.
1607 * XXX PF_UNSPEC -> PF_INET6 + PF_INET mapping needs to be in sync with
1611 addrconfig(struct addrinfo *pai)
1613 struct ifaddrs *ifaddrs, *ifa;
1614 struct sockaddr_in *sin;
1616 struct sockaddr_in6 *sin6;
1618 int seen_inet = 0, seen_inet6 = 0;
1620 if (getifaddrs(&ifaddrs) != 0)
1623 for (ifa = ifaddrs; ifa != NULL; ifa = ifa->ifa_next) {
1624 if (ifa->ifa_addr == NULL || (ifa->ifa_flags & IFF_UP) == 0)
1626 switch (ifa->ifa_addr->sa_family) {
1630 sin = (struct sockaddr_in *)(ifa->ifa_addr);
1631 if (htonl(sin->sin_addr.s_addr) == INADDR_LOOPBACK)
1639 sin6 = (struct sockaddr_in6 *)(ifa->ifa_addr);
1640 if (IN6_IS_ADDR_LOOPBACK(&sin6->sin6_addr))
1642 if ((ifa->ifa_flags & IFT_LOOP) != 0 &&
1643 IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr))
1645 if (is_ifdisabled(ifa->ifa_name))
1652 freeifaddrs(ifaddrs);
1654 switch(pai->ai_family) {
1656 return (seen_inet6);
1660 if (seen_inet == seen_inet6)
1662 pai->ai_family = seen_inet ? AF_INET : AF_INET6;
1670 is_ifdisabled(char *name)
1672 struct in6_ndireq nd;
1675 if ((fd = _socket(AF_INET6, SOCK_DGRAM | SOCK_CLOEXEC, 0)) < 0)
1677 memset(&nd, 0, sizeof(nd));
1678 strlcpy(nd.ifname, name, sizeof(nd.ifname));
1679 if (_ioctl(fd, SIOCGIFINFO_IN6, &nd) < 0) {
1684 return ((nd.ndi.flags & ND6_IFF_IFDISABLED) != 0);
1687 /* convert a string to a scope identifier. XXX: IPv6 specific */
1689 ip6_str2scopeid(char *scope, struct sockaddr_in6 *sin6, u_int32_t *scopeid)
1692 struct in6_addr *a6;
1695 a6 = &sin6->sin6_addr;
1697 /* empty scopeid portion is invalid */
1701 if (IN6_IS_ADDR_LINKLOCAL(a6) || IN6_IS_ADDR_MC_LINKLOCAL(a6) ||
1702 IN6_IS_ADDR_MC_NODELOCAL(a6)) {
1704 * We currently assume a one-to-one mapping between links
1705 * and interfaces, so we simply use interface indices for
1706 * like-local scopes.
1708 *scopeid = if_nametoindex(scope);
1714 /* still unclear about literal, allow numeric only - placeholder */
1715 if (IN6_IS_ADDR_SITELOCAL(a6) || IN6_IS_ADDR_MC_SITELOCAL(a6))
1717 if (IN6_IS_ADDR_MC_ORGLOCAL(a6))
1720 goto trynumeric; /* global */
1722 /* try to convert to a numeric id as a last resort */
1725 lscopeid = strtoul(scope, &ep, 10);
1726 *scopeid = (u_int32_t)(lscopeid & 0xffffffffUL);
1727 if (errno == 0 && ep && *ep == '\0' && *scopeid == lscopeid)
1737 addrinfo_id_func(char *buffer, size_t *buffer_size, va_list ap,
1743 const int op_id = 0; /* identifies the getaddrinfo for the cache */
1745 struct addrinfo *hints;
1748 int ai_flags, ai_family, ai_socktype, ai_protocol;
1749 size_t desired_size, size;
1751 statp = __res_state();
1752 res_options = statp->options & (RES_RECURSE | RES_DEFNAMES |
1753 RES_DNSRCH | RES_NOALIASES | RES_USE_INET6);
1755 hostname = va_arg(ap, char *);
1756 hints = va_arg(ap, struct addrinfo *);
1758 desired_size = sizeof(res_options) + sizeof(int) + sizeof(int) * 4;
1759 if (hostname != NULL) {
1760 size = strlen(hostname);
1761 desired_size += size + 1;
1765 if (desired_size > *buffer_size) {
1766 *buffer_size = desired_size;
1771 ai_flags = ai_family = ai_socktype = ai_protocol = 0;
1773 ai_flags = hints->ai_flags;
1774 ai_family = hints->ai_family;
1775 ai_socktype = hints->ai_socktype;
1776 ai_protocol = hints->ai_protocol;
1780 memcpy(p, &res_options, sizeof(res_options));
1781 p += sizeof(res_options);
1783 memcpy(p, &op_id, sizeof(int));
1786 memcpy(p, &ai_flags, sizeof(int));
1789 memcpy(p, &ai_family, sizeof(int));
1792 memcpy(p, &ai_socktype, sizeof(int));
1795 memcpy(p, &ai_protocol, sizeof(int));
1798 if (hostname != NULL)
1799 memcpy(p, hostname, size);
1801 *buffer_size = desired_size;
1802 return (NS_SUCCESS);
1806 addrinfo_marshal_func(char *buffer, size_t *buffer_size, void *retval,
1807 va_list ap, void *cache_mdata)
1809 struct addrinfo *ai, *cai;
1811 size_t desired_size, size, ai_size;
1813 ai = *((struct addrinfo **)retval);
1815 desired_size = sizeof(size_t);
1817 for (cai = ai; cai != NULL; cai = cai->ai_next) {
1818 desired_size += sizeof(struct addrinfo) + cai->ai_addrlen;
1819 if (cai->ai_canonname != NULL)
1820 desired_size += sizeof(size_t) +
1821 strlen(cai->ai_canonname);
1825 if (desired_size > *buffer_size) {
1826 /* this assignment is here for future use */
1828 *buffer_size = desired_size;
1832 memset(buffer, 0, desired_size);
1835 memcpy(p, &ai_size, sizeof(size_t));
1836 p += sizeof(size_t);
1837 for (cai = ai; cai != NULL; cai = cai->ai_next) {
1838 memcpy(p, cai, sizeof(struct addrinfo));
1839 p += sizeof(struct addrinfo);
1841 memcpy(p, cai->ai_addr, cai->ai_addrlen);
1842 p += cai->ai_addrlen;
1844 if (cai->ai_canonname != NULL) {
1845 size = strlen(cai->ai_canonname);
1846 memcpy(p, &size, sizeof(size_t));
1847 p += sizeof(size_t);
1849 memcpy(p, cai->ai_canonname, size);
1854 return (NS_SUCCESS);
1858 addrinfo_unmarshal_func(char *buffer, size_t buffer_size, void *retval,
1859 va_list ap, void *cache_mdata)
1861 struct addrinfo new_ai, *result, *sentinel, *lasts;
1864 size_t ai_size, ai_i, size;
1867 memcpy(&ai_size, p, sizeof(size_t));
1868 p += sizeof(size_t);
1872 for (ai_i = 0; ai_i < ai_size; ++ai_i) {
1873 memcpy(&new_ai, p, sizeof(struct addrinfo));
1874 p += sizeof(struct addrinfo);
1875 size = new_ai.ai_addrlen + sizeof(struct addrinfo) +
1878 sentinel = calloc(1, size);
1880 memcpy(sentinel, &new_ai, sizeof(struct addrinfo));
1881 sentinel->ai_addr = (struct sockaddr *)_ALIGN((char *)sentinel +
1882 sizeof(struct addrinfo));
1884 memcpy(sentinel->ai_addr, p, new_ai.ai_addrlen);
1885 p += new_ai.ai_addrlen;
1887 if (new_ai.ai_canonname != NULL) {
1888 memcpy(&size, p, sizeof(size_t));
1889 p += sizeof(size_t);
1891 sentinel->ai_canonname = calloc(1, size + 1);
1893 memcpy(sentinel->ai_canonname, p, size);
1897 if (result == NULL) {
1901 lasts->ai_next = sentinel;
1906 *((struct addrinfo **)retval) = result;
1907 return (NS_SUCCESS);
1909 #endif /* NS_CACHING */
1912 * FQDN hostname, DNS lookup
1915 explore_fqdn(const struct addrinfo *pai, const char *hostname,
1916 const char *servname, struct addrinfo **res)
1918 struct addrinfo *result;
1919 struct addrinfo *cur;
1923 static const nss_cache_info cache_info =
1924 NS_COMMON_CACHE_INFO_INITIALIZER(
1925 hosts, NULL, addrinfo_id_func, addrinfo_marshal_func,
1926 addrinfo_unmarshal_func);
1928 static const ns_dtab dtab[] = {
1929 NS_FILES_CB(_files_getaddrinfo, NULL)
1930 { NSSRC_DNS, _dns_getaddrinfo, NULL }, /* force -DHESIOD */
1931 NS_NIS_CB(_yp_getaddrinfo, NULL)
1933 NS_CACHE_CB(&cache_info)
1941 * if the servname does not match socktype/protocol, ignore it.
1943 if (get_portmatch(pai, servname) != 0)
1946 switch (_nsdispatch(&result, dtab, NSDB_HOSTS, "getaddrinfo",
1947 default_dns_files, hostname, pai)) {
1959 for (cur = result; cur; cur = cur->ai_next) {
1960 GET_PORT(cur, servname);
1961 /* canonname should be filled already */
1972 freeaddrinfo(result);
1977 static const char AskedForGot[] =
1978 "gethostby*.getanswer: asked for \"%s\", got \"%s\"";
1981 static struct addrinfo *
1982 getanswer(const querybuf *answer, int anslen, const char *qname, int qtype,
1983 const struct addrinfo *pai, res_state res)
1985 struct addrinfo sentinel, *cur;
1987 const struct afd *afd;
1994 int type, class, ancount, qdcount;
1995 int haveanswer, had_error;
1996 char tbuf[MAXDNAME];
1997 int (*name_ok)(const char *);
1998 char hostbuf[8*1024];
2000 memset(&sentinel, 0, sizeof(sentinel));
2004 eom = answer->buf + anslen;
2008 case T_ANY: /*use T_ANY only for T_A/T_AAAA lookup*/
2012 return (NULL); /* XXX should be abort(); */
2015 * find first satisfactory answer
2018 ancount = ntohs(hp->ancount);
2019 qdcount = ntohs(hp->qdcount);
2021 ep = hostbuf + sizeof hostbuf;
2022 cp = answer->buf + HFIXEDSZ;
2024 RES_SET_H_ERRNO(res, NO_RECOVERY);
2027 n = dn_expand(answer->buf, eom, cp, bp, ep - bp);
2028 if ((n < 0) || !(*name_ok)(bp)) {
2029 RES_SET_H_ERRNO(res, NO_RECOVERY);
2033 if (qtype == T_A || qtype == T_AAAA || qtype == T_ANY) {
2034 /* res_send() has already verified that the query name is the
2035 * same as the one we sent; this just gets the expanded name
2036 * (i.e., with the succeeding search-domain tacked on).
2038 n = strlen(bp) + 1; /* for the \0 */
2039 if (n >= MAXHOSTNAMELEN) {
2040 RES_SET_H_ERRNO(res, NO_RECOVERY);
2045 /* The qname can be abbreviated, but h_name is now absolute. */
2050 while (ancount-- > 0 && cp < eom && !had_error) {
2051 n = dn_expand(answer->buf, eom, cp, bp, ep - bp);
2052 if ((n < 0) || !(*name_ok)(bp)) {
2057 type = _getshort(cp);
2058 cp += INT16SZ; /* type */
2059 class = _getshort(cp);
2060 cp += INT16SZ + INT32SZ; /* class, TTL */
2062 cp += INT16SZ; /* len */
2063 if (class != C_IN) {
2064 /* XXX - debug? syslog? */
2066 continue; /* XXX - had_error++ ? */
2068 if ((qtype == T_A || qtype == T_AAAA || qtype == T_ANY) &&
2070 n = dn_expand(answer->buf, eom, cp, tbuf, sizeof tbuf);
2071 if ((n < 0) || !(*name_ok)(tbuf)) {
2076 /* Get canonical name. */
2077 n = strlen(tbuf) + 1; /* for the \0 */
2078 if (n > ep - bp || n >= MAXHOSTNAMELEN) {
2082 strlcpy(bp, tbuf, ep - bp);
2087 if (qtype == T_ANY) {
2088 if (!(type == T_A || type == T_AAAA)) {
2092 } else if (type != qtype) {
2094 if (type != T_KEY && type != T_SIG &&
2096 syslog(LOG_NOTICE|LOG_AUTH,
2097 "gethostby*.getanswer: asked for \"%s %s %s\", got type \"%s\"",
2098 qname, p_class(C_IN), p_type(qtype),
2102 continue; /* XXX - had_error++ ? */
2107 if (strcasecmp(canonname, bp) != 0) {
2109 syslog(LOG_NOTICE|LOG_AUTH,
2110 AskedForGot, canonname, bp);
2113 continue; /* XXX - had_error++ ? */
2115 if (type == T_A && n != INADDRSZ) {
2119 if (type == T_AAAA && n != IN6ADDRSZ) {
2123 #ifdef FILTER_V4MAPPED
2124 if (type == T_AAAA) {
2125 struct in6_addr in6;
2126 memcpy(&in6, cp, sizeof(in6));
2127 if (IN6_IS_ADDR_V4MAPPED(&in6)) {
2137 nn = strlen(bp) + 1; /* for the \0 */
2141 /* don't overwrite pai */
2143 ai.ai_family = (type == T_A) ? AF_INET : AF_INET6;
2144 afd = find_afd(ai.ai_family);
2149 cur->ai_next = get_ai(&ai, afd, (const char *)cp);
2150 if (cur->ai_next == NULL)
2152 while (cur && cur->ai_next)
2163 #if defined(RESOLVSORT)
2165 * We support only IPv4 address for backward
2166 * compatibility against gethostbyname(3).
2168 if (res->nsort && qtype == T_A) {
2169 if (addr4sort(&sentinel, res) < 0) {
2170 freeaddrinfo(sentinel.ai_next);
2171 RES_SET_H_ERRNO(res, NO_RECOVERY);
2175 #endif /*RESOLVSORT*/
2177 (void)get_canonname(pai, sentinel.ai_next, qname);
2179 (void)get_canonname(pai, sentinel.ai_next, canonname);
2180 RES_SET_H_ERRNO(res, NETDB_SUCCESS);
2181 return sentinel.ai_next;
2185 * We could have walked a CNAME chain, but the ultimate target
2186 * may not have what we looked for.
2188 RES_SET_H_ERRNO(res, ntohs(hp->ancount) > 0 ? NO_DATA : NO_RECOVERY);
2194 struct addrinfo *ai;
2199 addr4sort(struct addrinfo *sentinel, res_state res)
2201 struct addrinfo *ai;
2202 struct addr_ptr *addrs, addr;
2203 struct sockaddr_in *sin;
2210 for (ai = sentinel->ai_next; ai; ai = ai->ai_next)
2213 return 0; /* We don't need sorting. */
2214 if ((addrs = malloc(sizeof(struct addr_ptr) * naddrs)) == NULL)
2217 for (ai = sentinel->ai_next; ai; ai = ai->ai_next) {
2218 sin = (struct sockaddr_in *)ai->ai_addr;
2219 for (j = 0; (unsigned)j < res->nsort; j++) {
2220 if (res->sort_list[j].addr.s_addr ==
2221 (sin->sin_addr.s_addr & res->sort_list[j].mask))
2226 if (needsort == 0 && i > 0 && j < addrs[i - 1].aval)
2235 while (needsort < naddrs) {
2236 for (j = needsort - 1; j >= 0; j--) {
2237 if (addrs[j].aval > addrs[j+1].aval) {
2239 addrs[j] = addrs[j + 1];
2240 addrs[j + 1] = addr;
2248 for (i = 0; i < naddrs; ++i) {
2249 ai->ai_next = addrs[i].ai;
2256 #endif /*RESOLVSORT*/
2260 _dns_getaddrinfo(void *rv, void *cb_data, va_list ap)
2262 struct addrinfo *ai, ai0;
2263 querybuf *buf, *buf2;
2264 const char *hostname;
2265 const struct addrinfo *pai;
2266 struct addrinfo sentinel, *cur;
2267 struct res_target q, q2;
2272 hostname = va_arg(ap, char *);
2273 pai = va_arg(ap, const struct addrinfo *);
2275 memset(&q, 0, sizeof(q));
2276 memset(&q2, 0, sizeof(q2));
2277 memset(&sentinel, 0, sizeof(sentinel));
2280 res = __res_state();
2282 buf = malloc(sizeof(*buf));
2284 RES_SET_H_ERRNO(res, NETDB_INTERNAL);
2287 buf2 = malloc(sizeof(*buf2));
2290 RES_SET_H_ERRNO(res, NETDB_INTERNAL);
2294 if (pai->ai_family == AF_INET6 &&
2295 (pai->ai_flags & AI_V4MAPPED) == AI_V4MAPPED) {
2297 ai0.ai_family = AF_UNSPEC;
2301 switch (pai->ai_family) {
2306 q.answer = buf->buf;
2307 q.anslen = sizeof(buf->buf);
2312 q2.answer = buf2->buf;
2313 q2.anslen = sizeof(buf2->buf);
2319 q.answer = buf->buf;
2320 q.anslen = sizeof(buf->buf);
2326 q.answer = buf->buf;
2327 q.anslen = sizeof(buf->buf);
2335 if ((res->options & RES_INIT) == 0 && res_ninit(res) == -1) {
2336 RES_SET_H_ERRNO(res, NETDB_INTERNAL);
2342 if (res_searchN(hostname, &q, res) < 0) {
2349 ai = getanswer(buf2, q2.n, q2.name, q2.qtype, pai, res);
2352 while (cur && cur->ai_next)
2356 if (ai == NULL || pai->ai_family != AF_UNSPEC ||
2357 (pai->ai_flags & (AI_ALL | AI_V4MAPPED)) != AI_V4MAPPED) {
2358 ai = getanswer(buf, q.n, q.name, q.qtype, pai, res);
2364 if (sentinel.ai_next == NULL)
2365 switch (res->res_h_errno) {
2366 case HOST_NOT_FOUND:
2374 *((struct addrinfo **)rv) = sentinel.ai_next;
2379 _sethtent(FILE **hostf)
2382 *hostf = fopen(_PATH_HOSTS, "re");
2388 _endhtent(FILE **hostf)
2391 (void) fclose(*hostf);
2396 static struct addrinfo *
2397 _gethtent(FILE **hostf, const char *name, const struct addrinfo *pai)
2400 char *cp, *tname, *cname;
2401 struct addrinfo hints, *res0, *res;
2404 char hostbuf[8*1024];
2406 if (!*hostf && !(*hostf = fopen(_PATH_HOSTS, "re")))
2409 if (!(p = fgets(hostbuf, sizeof hostbuf, *hostf)))
2413 cp = strpbrk(p, "#\n");
2416 if (!(cp = strpbrk(p, " \t")))
2421 /* if this is not something we're looking for, skip it. */
2423 if (*cp == ' ' || *cp == '\t') {
2430 if ((cp = strpbrk(cp, " \t")) != NULL)
2432 if (strcasecmp(name, tname) == 0)
2438 /* we should not glob socktype/protocol here */
2439 memset(&hints, 0, sizeof(hints));
2440 hints.ai_family = pai->ai_family;
2441 hints.ai_socktype = SOCK_DGRAM;
2442 hints.ai_protocol = 0;
2443 hints.ai_flags = AI_NUMERICHOST;
2444 if (pai->ai_family == AF_INET6 &&
2445 (pai->ai_flags & AI_V4MAPPED) == AI_V4MAPPED)
2446 hints.ai_flags |= AI_V4MAPPED;
2447 error = getaddrinfo(addr, "0", &hints, &res0);
2450 #ifdef FILTER_V4MAPPED
2451 /* XXX should check all items in the chain */
2452 if (res0->ai_family == AF_INET6 &&
2453 IN6_IS_ADDR_V4MAPPED(&((struct sockaddr_in6 *)res0->ai_addr)->sin6_addr)) {
2458 for (res = res0; res; res = res->ai_next) {
2460 res->ai_flags = pai->ai_flags;
2461 res->ai_socktype = pai->ai_socktype;
2462 res->ai_protocol = pai->ai_protocol;
2464 if (pai->ai_flags & AI_CANONNAME) {
2465 if (get_canonname(pai, res, cname) != 0) {
2474 static struct addrinfo *
2475 _getht(FILE **hostf, const char *name, const struct addrinfo *pai,
2476 struct addrinfo *cur)
2480 while ((p = _gethtent(hostf, name, pai)) != NULL) {
2482 while (cur && cur->ai_next)
2490 _files_getaddrinfo(void *rv, void *cb_data, va_list ap)
2493 const struct addrinfo *pai;
2494 struct addrinfo sentinel, *cur;
2497 name = va_arg(ap, char *);
2498 pai = va_arg(ap, struct addrinfo *);
2500 memset(&sentinel, 0, sizeof(sentinel));
2504 if (pai->ai_family == AF_INET6 &&
2505 (pai->ai_flags & (AI_ALL | AI_V4MAPPED)) == AI_V4MAPPED) {
2506 struct addrinfo ai0 = *pai;
2508 ai0.ai_flags &= ~AI_V4MAPPED;
2509 cur = _getht(&hostf, name, &ai0, cur);
2510 if (sentinel.ai_next == NULL) {
2512 ai0.ai_flags |= AI_V4MAPPED;
2513 cur = _getht(&hostf, name, &ai0, cur);
2516 cur = _getht(&hostf, name, pai, cur);
2519 *((struct addrinfo **)rv) = sentinel.ai_next;
2520 if (sentinel.ai_next == NULL)
2527 static struct addrinfo *
2528 _yphostent(char *line, const struct addrinfo *pai)
2530 struct addrinfo sentinel, *cur;
2531 struct addrinfo hints, *res, *res0;
2534 const char *addr, *canonname;
2538 addr = canonname = NULL;
2540 memset(&sentinel, 0, sizeof(sentinel));
2544 /* terminate line */
2545 cp = strchr(p, '\n');
2552 cp = strpbrk(p, " \t");
2554 if (canonname == NULL)
2564 if (*cp == ' ' || *cp == '\t') {
2570 if ((cp = strpbrk(cp, " \t")) != NULL)
2575 hints.ai_flags = AI_NUMERICHOST;
2576 if (pai->ai_family == AF_INET6 &&
2577 (pai->ai_flags & AI_V4MAPPED) == AI_V4MAPPED)
2578 hints.ai_flags |= AI_V4MAPPED;
2579 error = getaddrinfo(addr, NULL, &hints, &res0);
2581 for (res = res0; res; res = res->ai_next) {
2583 res->ai_flags = pai->ai_flags;
2585 if (pai->ai_flags & AI_CANONNAME)
2586 (void)get_canonname(pai, res, canonname);
2591 cur->ai_next = res0;
2592 while (cur && cur->ai_next)
2602 return sentinel.ai_next;
2607 _yp_getaddrinfo(void *rv, void *cb_data, va_list ap)
2609 struct addrinfo sentinel, *cur;
2610 struct addrinfo *ai = NULL;
2614 const struct addrinfo *pai;
2617 if (_yp_check(&ypdomain) == 0)
2620 name = va_arg(ap, char *);
2621 pai = va_arg(ap, const struct addrinfo *);
2623 memset(&sentinel, 0, sizeof(sentinel));
2626 /* ipnodes.byname can hold both IPv4/v6 */
2627 r = yp_match(ypdomain, "ipnodes.byname", name,
2628 (int)strlen(name), &ypbuf, &ypbuflen);
2630 ai = _yphostent(ypbuf, pai);
2633 while (cur && cur->ai_next)
2640 struct sockaddr_in6 *sin6;
2642 switch (ai->ai_family) {
2646 sin6 = (struct sockaddr_in6 *)ai->ai_addr;
2647 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr))
2653 /* hosts.byname is only for IPv4 (Solaris8) */
2654 if (pai->ai_family == AF_UNSPEC || pai->ai_family == AF_INET ||
2655 ((pai->ai_family == AF_INET6 &&
2656 (pai->ai_flags & AI_V4MAPPED) == AI_V4MAPPED) &&
2657 (ai == NULL || (pai->ai_flags & AI_ALL) == AI_ALL))) {
2658 r = yp_match(ypdomain, "hosts.byname", name,
2659 (int)strlen(name), &ypbuf, &ypbuflen);
2661 struct addrinfo ai4;
2664 if (pai->ai_family == AF_UNSPEC)
2665 ai4.ai_family = AF_INET;
2666 ai = _yphostent(ypbuf, &ai4);
2669 while (cur && cur->ai_next)
2677 if (sentinel.ai_next == NULL) {
2678 RES_SET_H_ERRNO(__res_state(), HOST_NOT_FOUND);
2681 *((struct addrinfo **)rv) = sentinel.ai_next;
2686 /* resolver logic */
2689 * Formulate a normal query, send, and await answer.
2690 * Returned answer is placed in supplied buffer "answer".
2691 * Perform preliminary check of answer, returning success only
2692 * if no error is indicated and the answer count is nonzero.
2693 * Return the size of the response on success, -1 on error.
2694 * Error number is left in h_errno.
2696 * Caller must parse answer and determine whether it answers the question.
2699 res_queryN(const char *name, struct res_target *target, res_state res)
2705 struct res_target *t;
2712 buf = malloc(MAXPACKET);
2714 RES_SET_H_ERRNO(res, NETDB_INTERNAL);
2718 for (t = target; t; t = t->next) {
2723 hp = (HEADER *)(void *)t->answer;
2725 /* make it easier... */
2731 oflags = res->_flags;
2734 hp->rcode = NOERROR; /* default */
2737 if (res->options & RES_DEBUG)
2738 printf(";; res_query(%s, %d, %d)\n", name, class, type);
2741 n = res_nmkquery(res, QUERY, name, class, type, NULL, 0, NULL,
2743 if (n > 0 && (res->_flags & RES_F_EDNS0ERR) == 0 &&
2744 (res->options & (RES_USE_EDNS0|RES_USE_DNSSEC)) != 0U)
2745 n = res_nopt(res, n, buf, MAXPACKET, anslen);
2748 if (res->options & RES_DEBUG)
2749 printf(";; res_query: mkquery failed\n");
2752 RES_SET_H_ERRNO(res, NO_RECOVERY);
2755 n = res_nsend(res, buf, n, answer, anslen);
2758 * if the query choked with EDNS0, retry
2761 if ((res->options & (RES_USE_EDNS0|RES_USE_DNSSEC))
2763 ((oflags ^ res->_flags) & RES_F_EDNS0ERR) != 0) {
2764 res->_flags |= RES_F_EDNS0ERR;
2765 if (res->options & RES_DEBUG)
2766 printf(";; res_nquery: retry without EDNS0\n");
2769 rcode = hp->rcode; /* record most recent error */
2771 if (res->options & RES_DEBUG)
2772 printf(";; res_query: send error\n");
2778 hp->rcode = FORMERR; /* XXX not very informative */
2779 if (hp->rcode != NOERROR || ntohs(hp->ancount) == 0) {
2780 rcode = hp->rcode; /* record most recent error */
2782 if (res->options & RES_DEBUG)
2783 printf(";; rcode = %u, ancount=%u\n", hp->rcode,
2784 ntohs(hp->ancount));
2789 ancount += ntohs(hp->ancount);
2799 RES_SET_H_ERRNO(res, HOST_NOT_FOUND);
2802 RES_SET_H_ERRNO(res, TRY_AGAIN);
2805 RES_SET_H_ERRNO(res, NO_DATA);
2811 RES_SET_H_ERRNO(res, NO_RECOVERY);
2820 * Formulate a normal query, send, and retrieve answer in supplied buffer.
2821 * Return the size of the response on success, -1 on error.
2822 * If enabled, implement search rules until answer or unrecoverable failure
2823 * is detected. Error code, if any, is left in h_errno.
2826 res_searchN(const char *name, struct res_target *target, res_state res)
2828 const char *cp, * const *domain;
2829 HEADER *hp = (HEADER *)(void *)target->answer; /*XXX*/
2831 int trailing_dot, ret, saved_herrno;
2832 int got_nodata = 0, got_servfail = 0, root_on_list = 0;
2833 int tried_as_is = 0;
2835 char abuf[MAXDNAME];
2838 RES_SET_H_ERRNO(res, HOST_NOT_FOUND); /* default, if we never query */
2840 for (cp = name; *cp; cp++)
2841 dots += (*cp == '.');
2843 if (cp > name && *--cp == '.')
2847 * if there aren't any dots, it could be a user-level alias
2850 (cp = res_hostalias(res, name, abuf, sizeof(abuf))) != NULL)
2851 return (res_queryN(cp, target, res));
2854 * If there are enough dots in the name, let's just give it a
2855 * try 'as is'. The threshold can be set with the "ndots" option.
2856 * Also, query 'as is', if there is a trailing dot in the name.
2859 if (dots >= res->ndots || trailing_dot) {
2860 ret = res_querydomainN(name, NULL, target, res);
2861 if (ret > 0 || trailing_dot)
2863 if (errno == ECONNREFUSED) {
2864 RES_SET_H_ERRNO(res, TRY_AGAIN);
2867 switch (res->res_h_errno) {
2869 case HOST_NOT_FOUND:
2872 if (hp->rcode == SERVFAIL)
2878 saved_herrno = res->res_h_errno;
2883 * We do at least one level of search if
2884 * - there is no dot and RES_DEFNAME is set, or
2885 * - there is at least one dot, there is no trailing dot,
2886 * and RES_DNSRCH is set.
2888 if ((!dots && (res->options & RES_DEFNAMES)) ||
2889 (dots && !trailing_dot && (res->options & RES_DNSRCH))) {
2892 for (domain = (const char * const *)res->dnsrch;
2897 if (domain[0][0] == '\0' ||
2898 (domain[0][0] == '.' && domain[0][1] == '\0'))
2901 if (root_on_list && tried_as_is)
2904 ret = res_querydomainN(name, *domain, target, res);
2909 * If no server present, give up.
2910 * If name isn't found in this domain,
2911 * keep trying higher domains in the search list
2912 * (if that's enabled).
2913 * On a NO_DATA error, keep trying, otherwise
2914 * a wildcard entry of another type could keep us
2915 * from finding this entry higher in the domain.
2916 * If we get some other error (negative answer or
2917 * server failure), then stop searching up,
2918 * but try the input name below in case it's
2921 if (errno == ECONNREFUSED) {
2922 RES_SET_H_ERRNO(res, TRY_AGAIN);
2926 switch (res->res_h_errno) {
2930 case HOST_NOT_FOUND:
2935 if (hp->rcode == SERVFAIL) {
2936 /* try next search element, if any */
2941 /* anything else implies that we're done */
2945 * if we got here for some reason other than DNSRCH,
2946 * we only wanted one iteration of the loop, so stop.
2948 if (!(res->options & RES_DNSRCH))
2953 switch (res->res_h_errno) {
2955 case HOST_NOT_FOUND:
2958 if (hp->rcode == SERVFAIL)
2966 * If the query has not already been tried as is then try it
2967 * unless RES_NOTLDQUERY is set and there were no dots.
2969 if ((dots || !searched || !(res->options & RES_NOTLDQUERY)) &&
2970 !(tried_as_is || root_on_list)) {
2971 ret = res_querydomainN(name, NULL, target, res);
2977 * if we got here, we didn't satisfy the search.
2978 * if we did an initial full query, return that query's h_errno
2979 * (note that we wouldn't be here if that query had succeeded).
2980 * else if we ever got a nodata, send that back as the reason.
2981 * else send back meaningless h_errno, that being the one from
2982 * the last DNSRCH we did.
2985 if (saved_herrno != -1)
2986 RES_SET_H_ERRNO(res, saved_herrno);
2987 else if (got_nodata)
2988 RES_SET_H_ERRNO(res, NO_DATA);
2989 else if (got_servfail)
2990 RES_SET_H_ERRNO(res, TRY_AGAIN);
2995 * Perform a call on res_query on the concatenation of name and domain,
2996 * removing a trailing dot from name if domain is NULL.
2999 res_querydomainN(const char *name, const char *domain,
3000 struct res_target *target, res_state res)
3002 char nbuf[MAXDNAME];
3003 const char *longname = nbuf;
3007 if (res->options & RES_DEBUG)
3008 printf(";; res_querydomain(%s, %s)\n",
3009 name, domain?domain:"<Nil>");
3011 if (domain == NULL) {
3013 * Check for trailing '.';
3014 * copy without '.' if present.
3017 if (n >= MAXDNAME) {
3018 RES_SET_H_ERRNO(res, NO_RECOVERY);
3021 if (n > 0 && name[--n] == '.') {
3022 strncpy(nbuf, name, n);
3029 if (n + d + 1 >= MAXDNAME) {
3030 RES_SET_H_ERRNO(res, NO_RECOVERY);
3033 snprintf(nbuf, sizeof(nbuf), "%s.%s", name, domain);
3035 return (res_queryN(longname, target, res));