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)
1250 if (inet_pton(afd->a_af, hostname, pton) != 1) {
1251 if (pai->ai_family != AF_INET6 ||
1252 (pai->ai_flags & AI_V4MAPPED) != AI_V4MAPPED)
1254 if (inet_aton(hostname, (struct in_addr *)pton) != 1)
1256 afd = &afdl[N_INET];
1258 ai0.ai_family = AF_INET;
1264 if (pai->ai_family == afd->a_af) {
1265 GET_AI(ai, afd, pton);
1266 GET_PORT(ai, servname);
1267 if ((pai->ai_flags & AI_CANONNAME)) {
1269 * Set the numeric address itself as the canonical
1270 * name, based on a clarification in RFC3493.
1272 GET_CANONNAME(ai, canonname);
1276 * XXX: This should not happen since we already matched the AF
1293 * numeric hostname with scope
1296 explore_numeric_scope(const struct addrinfo *pai, const char *hostname,
1297 const char *servname, struct addrinfo **res)
1299 #if !defined(SCOPE_DELIMITER) || !defined(INET6)
1300 return explore_numeric(pai, hostname, servname, res, hostname);
1302 const struct afd *afd;
1303 struct addrinfo *cur;
1305 char *cp, *hostname2 = NULL, *scope, *addr;
1306 struct sockaddr_in6 *sin6;
1308 afd = find_afd(pai->ai_family);
1313 return explore_numeric(pai, hostname, servname, res, hostname);
1315 cp = strchr(hostname, SCOPE_DELIMITER);
1317 return explore_numeric(pai, hostname, servname, res, hostname);
1320 * Handle special case of <scoped_address><delimiter><scope id>
1322 hostname2 = strdup(hostname);
1323 if (hostname2 == NULL)
1325 /* terminate at the delimiter */
1326 hostname2[cp - hostname] = '\0';
1330 error = explore_numeric(pai, addr, servname, res, hostname);
1334 for (cur = *res; cur; cur = cur->ai_next) {
1335 if (cur->ai_family != AF_INET6)
1337 sin6 = (struct sockaddr_in6 *)(void *)cur->ai_addr;
1338 if (ip6_str2scopeid(scope, sin6, &scopeid) == -1) {
1342 return(EAI_NONAME); /* XXX: is return OK? */
1344 sin6->sin6_scope_id = scopeid;
1350 if (error && *res) {
1359 get_canonname(const struct addrinfo *pai, struct addrinfo *ai, const char *str)
1361 if ((pai->ai_flags & AI_CANONNAME) != 0) {
1362 ai->ai_canonname = strdup(str);
1363 if (ai->ai_canonname == NULL)
1369 static struct addrinfo *
1370 get_ai(const struct addrinfo *pai, const struct afd *afd, const char *addr)
1373 struct addrinfo *ai;
1375 struct in6_addr faith_prefix;
1380 struct in6_addr mapaddr;
1385 * Transfrom an IPv4 addr into a special IPv6 addr format for
1386 * IPv6->IPv4 translation gateway. (only TCP is supported now)
1388 * +-----------------------------------+------------+
1389 * | faith prefix part (12 bytes) | embedded |
1390 * | | IPv4 addr part (4 bytes)
1391 * +-----------------------------------+------------+
1393 * faith prefix part is specified as ascii IPv6 addr format
1394 * in environmental variable GAI.
1395 * For FAITH to work correctly, routing to faith prefix must be
1396 * setup toward a machine where a FAITH daemon operates.
1397 * Also, the machine must enable some mechanizm
1398 * (e.g. faith interface hack) to divert those packet with
1399 * faith prefixed destination addr to user-land FAITH daemon.
1401 fp_str = getenv("GAI");
1402 if (fp_str && inet_pton(AF_INET6, fp_str, &faith_prefix) == 1 &&
1403 afd->a_af == AF_INET && pai->ai_socktype == SOCK_STREAM) {
1407 memcpy(&v4a, addr, sizeof v4a);
1408 v4a_top = v4a >> IN_CLASSA_NSHIFT;
1409 if (!IN_MULTICAST(v4a) && !IN_EXPERIMENTAL(v4a) &&
1410 v4a_top != 0 && v4a != IN_LOOPBACKNET) {
1411 afd = &afdl[N_INET6];
1412 memcpy(&faith_prefix.s6_addr[12], addr,
1413 sizeof(struct in_addr));
1420 if (afd->a_af == AF_INET && (pai->ai_flags & AI_V4MAPPED) != 0) {
1421 afd = &afdl[N_INET6];
1422 _map_v4v6_address(addr, (char *)&mapaddr);
1423 addr = (char *)&mapaddr;
1427 ai = (struct addrinfo *)malloc(sizeof(struct addrinfo)
1428 + (afd->a_socklen));
1432 memcpy(ai, pai, sizeof(struct addrinfo));
1433 ai->ai_addr = (struct sockaddr *)(void *)(ai + 1);
1434 memset(ai->ai_addr, 0, (size_t)afd->a_socklen);
1435 ai->ai_addr->sa_len = afd->a_socklen;
1436 ai->ai_addrlen = afd->a_socklen;
1437 ai->ai_addr->sa_family = ai->ai_family = afd->a_af;
1438 p = (char *)(void *)(ai->ai_addr);
1441 memcpy(p + afd->a_off, &faith_prefix, (size_t)afd->a_addrlen);
1444 memcpy(p + afd->a_off, addr, (size_t)afd->a_addrlen);
1448 /* XXX need to malloc() the same way we do from other functions! */
1449 static struct addrinfo *
1450 copy_ai(const struct addrinfo *pai)
1452 struct addrinfo *ai;
1455 l = sizeof(*ai) + pai->ai_addrlen;
1456 if ((ai = calloc(1, l)) == NULL)
1458 memcpy(ai, pai, sizeof(*ai));
1459 ai->ai_addr = (struct sockaddr *)(void *)(ai + 1);
1460 memcpy(ai->ai_addr, pai->ai_addr, pai->ai_addrlen);
1462 if (pai->ai_canonname) {
1463 l = strlen(pai->ai_canonname) + 1;
1464 if ((ai->ai_canonname = malloc(l)) == NULL) {
1468 strlcpy(ai->ai_canonname, pai->ai_canonname, l);
1470 /* just to make sure */
1471 ai->ai_canonname = NULL;
1480 get_portmatch(const struct addrinfo *ai, const char *servname)
1483 /* get_port does not touch first argument when matchonly == 1. */
1484 /* LINTED const cast */
1485 return get_port((struct addrinfo *)ai, servname, 1);
1489 get_port(struct addrinfo *ai, const char *servname, int matchonly)
1496 if (servname == NULL)
1498 switch (ai->ai_family) {
1508 switch (ai->ai_socktype) {
1513 case SOCK_SEQPACKET:
1517 switch (ai->ai_family) {
1530 return EAI_SOCKTYPE;
1533 error = str2number(servname, &port);
1537 if (port < 0 || port > 65535)
1541 if (ai->ai_flags & AI_NUMERICSERV)
1544 switch (ai->ai_protocol) {
1554 case IPPROTO_UDPLITE:
1562 if ((sp = getservbyname(servname, proto)) == NULL)
1568 switch (ai->ai_family) {
1570 ((struct sockaddr_in *)(void *)
1571 ai->ai_addr)->sin_port = port;
1575 ((struct sockaddr_in6 *)(void *)
1576 ai->ai_addr)->sin6_port = port;
1585 static const struct afd *
1588 const struct afd *afd;
1590 if (af == PF_UNSPEC)
1592 for (afd = afdl; afd->a_af; afd++) {
1593 if (afd->a_af == af)
1600 * RFC 3493: AI_ADDRCONFIG check. Determines which address families are
1601 * configured on the local system and correlates with pai->ai_family value.
1602 * If an address family is not configured on the system, it will not be
1603 * queried for. For this purpose, loopback addresses are not considered
1604 * configured addresses.
1606 * XXX PF_UNSPEC -> PF_INET6 + PF_INET mapping needs to be in sync with
1610 addrconfig(struct addrinfo *pai)
1612 struct ifaddrs *ifaddrs, *ifa;
1613 struct sockaddr_in *sin;
1615 struct sockaddr_in6 *sin6;
1617 int seen_inet = 0, seen_inet6 = 0;
1619 if (getifaddrs(&ifaddrs) != 0)
1622 for (ifa = ifaddrs; ifa != NULL; ifa = ifa->ifa_next) {
1623 if (ifa->ifa_addr == NULL || (ifa->ifa_flags & IFF_UP) == 0)
1625 switch (ifa->ifa_addr->sa_family) {
1629 sin = (struct sockaddr_in *)(ifa->ifa_addr);
1630 if (htonl(sin->sin_addr.s_addr) == INADDR_LOOPBACK)
1638 sin6 = (struct sockaddr_in6 *)(ifa->ifa_addr);
1639 if (IN6_IS_ADDR_LOOPBACK(&sin6->sin6_addr))
1641 if ((ifa->ifa_flags & IFT_LOOP) != 0 &&
1642 IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr))
1644 if (is_ifdisabled(ifa->ifa_name))
1651 freeifaddrs(ifaddrs);
1653 switch(pai->ai_family) {
1655 return (seen_inet6);
1659 if (seen_inet == seen_inet6)
1661 pai->ai_family = seen_inet ? AF_INET : AF_INET6;
1669 is_ifdisabled(char *name)
1671 struct in6_ndireq nd;
1674 if ((fd = _socket(AF_INET6, SOCK_DGRAM | SOCK_CLOEXEC, 0)) < 0)
1676 memset(&nd, 0, sizeof(nd));
1677 strlcpy(nd.ifname, name, sizeof(nd.ifname));
1678 if (_ioctl(fd, SIOCGIFINFO_IN6, &nd) < 0) {
1683 return ((nd.ndi.flags & ND6_IFF_IFDISABLED) != 0);
1686 /* convert a string to a scope identifier. XXX: IPv6 specific */
1688 ip6_str2scopeid(char *scope, struct sockaddr_in6 *sin6, u_int32_t *scopeid)
1691 struct in6_addr *a6;
1694 a6 = &sin6->sin6_addr;
1696 /* empty scopeid portion is invalid */
1700 if (IN6_IS_ADDR_LINKLOCAL(a6) || IN6_IS_ADDR_MC_LINKLOCAL(a6) ||
1701 IN6_IS_ADDR_MC_NODELOCAL(a6)) {
1703 * We currently assume a one-to-one mapping between links
1704 * and interfaces, so we simply use interface indices for
1705 * like-local scopes.
1707 *scopeid = if_nametoindex(scope);
1713 /* still unclear about literal, allow numeric only - placeholder */
1714 if (IN6_IS_ADDR_SITELOCAL(a6) || IN6_IS_ADDR_MC_SITELOCAL(a6))
1716 if (IN6_IS_ADDR_MC_ORGLOCAL(a6))
1719 goto trynumeric; /* global */
1721 /* try to convert to a numeric id as a last resort */
1724 lscopeid = strtoul(scope, &ep, 10);
1725 *scopeid = (u_int32_t)(lscopeid & 0xffffffffUL);
1726 if (errno == 0 && ep && *ep == '\0' && *scopeid == lscopeid)
1736 addrinfo_id_func(char *buffer, size_t *buffer_size, va_list ap,
1742 const int op_id = 0; /* identifies the getaddrinfo for the cache */
1744 struct addrinfo *hints;
1747 int ai_flags, ai_family, ai_socktype, ai_protocol;
1748 size_t desired_size, size;
1750 statp = __res_state();
1751 res_options = statp->options & (RES_RECURSE | RES_DEFNAMES |
1752 RES_DNSRCH | RES_NOALIASES | RES_USE_INET6);
1754 hostname = va_arg(ap, char *);
1755 hints = va_arg(ap, struct addrinfo *);
1757 desired_size = sizeof(res_options) + sizeof(int) + sizeof(int) * 4;
1758 if (hostname != NULL) {
1759 size = strlen(hostname);
1760 desired_size += size + 1;
1764 if (desired_size > *buffer_size) {
1765 *buffer_size = desired_size;
1770 ai_flags = ai_family = ai_socktype = ai_protocol = 0;
1772 ai_flags = hints->ai_flags;
1773 ai_family = hints->ai_family;
1774 ai_socktype = hints->ai_socktype;
1775 ai_protocol = hints->ai_protocol;
1779 memcpy(p, &res_options, sizeof(res_options));
1780 p += sizeof(res_options);
1782 memcpy(p, &op_id, sizeof(int));
1785 memcpy(p, &ai_flags, sizeof(int));
1788 memcpy(p, &ai_family, sizeof(int));
1791 memcpy(p, &ai_socktype, sizeof(int));
1794 memcpy(p, &ai_protocol, sizeof(int));
1797 if (hostname != NULL)
1798 memcpy(p, hostname, size);
1800 *buffer_size = desired_size;
1801 return (NS_SUCCESS);
1805 addrinfo_marshal_func(char *buffer, size_t *buffer_size, void *retval,
1806 va_list ap, void *cache_mdata)
1808 struct addrinfo *ai, *cai;
1810 size_t desired_size, size, ai_size;
1812 ai = *((struct addrinfo **)retval);
1814 desired_size = sizeof(size_t);
1816 for (cai = ai; cai != NULL; cai = cai->ai_next) {
1817 desired_size += sizeof(struct addrinfo) + cai->ai_addrlen;
1818 if (cai->ai_canonname != NULL)
1819 desired_size += sizeof(size_t) +
1820 strlen(cai->ai_canonname);
1824 if (desired_size > *buffer_size) {
1825 /* this assignment is here for future use */
1827 *buffer_size = desired_size;
1831 memset(buffer, 0, desired_size);
1834 memcpy(p, &ai_size, sizeof(size_t));
1835 p += sizeof(size_t);
1836 for (cai = ai; cai != NULL; cai = cai->ai_next) {
1837 memcpy(p, cai, sizeof(struct addrinfo));
1838 p += sizeof(struct addrinfo);
1840 memcpy(p, cai->ai_addr, cai->ai_addrlen);
1841 p += cai->ai_addrlen;
1843 if (cai->ai_canonname != NULL) {
1844 size = strlen(cai->ai_canonname);
1845 memcpy(p, &size, sizeof(size_t));
1846 p += sizeof(size_t);
1848 memcpy(p, cai->ai_canonname, size);
1853 return (NS_SUCCESS);
1857 addrinfo_unmarshal_func(char *buffer, size_t buffer_size, void *retval,
1858 va_list ap, void *cache_mdata)
1860 struct addrinfo new_ai, *result, *sentinel, *lasts;
1863 size_t ai_size, ai_i, size;
1866 memcpy(&ai_size, p, sizeof(size_t));
1867 p += sizeof(size_t);
1871 for (ai_i = 0; ai_i < ai_size; ++ai_i) {
1872 memcpy(&new_ai, p, sizeof(struct addrinfo));
1873 p += sizeof(struct addrinfo);
1874 size = new_ai.ai_addrlen + sizeof(struct addrinfo) +
1877 sentinel = calloc(1, size);
1879 memcpy(sentinel, &new_ai, sizeof(struct addrinfo));
1880 sentinel->ai_addr = (struct sockaddr *)_ALIGN((char *)sentinel +
1881 sizeof(struct addrinfo));
1883 memcpy(sentinel->ai_addr, p, new_ai.ai_addrlen);
1884 p += new_ai.ai_addrlen;
1886 if (new_ai.ai_canonname != NULL) {
1887 memcpy(&size, p, sizeof(size_t));
1888 p += sizeof(size_t);
1890 sentinel->ai_canonname = calloc(1, size + 1);
1892 memcpy(sentinel->ai_canonname, p, size);
1896 if (result == NULL) {
1900 lasts->ai_next = sentinel;
1905 *((struct addrinfo **)retval) = result;
1906 return (NS_SUCCESS);
1908 #endif /* NS_CACHING */
1911 * FQDN hostname, DNS lookup
1914 explore_fqdn(const struct addrinfo *pai, const char *hostname,
1915 const char *servname, struct addrinfo **res)
1917 struct addrinfo *result;
1918 struct addrinfo *cur;
1922 static const nss_cache_info cache_info =
1923 NS_COMMON_CACHE_INFO_INITIALIZER(
1924 hosts, NULL, addrinfo_id_func, addrinfo_marshal_func,
1925 addrinfo_unmarshal_func);
1927 static const ns_dtab dtab[] = {
1928 NS_FILES_CB(_files_getaddrinfo, NULL)
1929 { NSSRC_DNS, _dns_getaddrinfo, NULL }, /* force -DHESIOD */
1930 NS_NIS_CB(_yp_getaddrinfo, NULL)
1932 NS_CACHE_CB(&cache_info)
1940 * if the servname does not match socktype/protocol, ignore it.
1942 if (get_portmatch(pai, servname) != 0)
1945 switch (_nsdispatch(&result, dtab, NSDB_HOSTS, "getaddrinfo",
1946 default_dns_files, hostname, pai)) {
1958 for (cur = result; cur; cur = cur->ai_next) {
1959 GET_PORT(cur, servname);
1960 /* canonname should be filled already */
1971 freeaddrinfo(result);
1976 static const char AskedForGot[] =
1977 "gethostby*.getanswer: asked for \"%s\", got \"%s\"";
1980 static struct addrinfo *
1981 getanswer(const querybuf *answer, int anslen, const char *qname, int qtype,
1982 const struct addrinfo *pai, res_state res)
1984 struct addrinfo sentinel, *cur;
1986 const struct afd *afd;
1993 int type, class, ancount, qdcount;
1994 int haveanswer, had_error;
1995 char tbuf[MAXDNAME];
1996 int (*name_ok)(const char *);
1997 char hostbuf[8*1024];
1999 memset(&sentinel, 0, sizeof(sentinel));
2003 eom = answer->buf + anslen;
2007 case T_ANY: /*use T_ANY only for T_A/T_AAAA lookup*/
2011 return (NULL); /* XXX should be abort(); */
2014 * find first satisfactory answer
2017 ancount = ntohs(hp->ancount);
2018 qdcount = ntohs(hp->qdcount);
2020 ep = hostbuf + sizeof hostbuf;
2021 cp = answer->buf + HFIXEDSZ;
2023 RES_SET_H_ERRNO(res, NO_RECOVERY);
2026 n = dn_expand(answer->buf, eom, cp, bp, ep - bp);
2027 if ((n < 0) || !(*name_ok)(bp)) {
2028 RES_SET_H_ERRNO(res, NO_RECOVERY);
2032 if (qtype == T_A || qtype == T_AAAA || qtype == T_ANY) {
2033 /* res_send() has already verified that the query name is the
2034 * same as the one we sent; this just gets the expanded name
2035 * (i.e., with the succeeding search-domain tacked on).
2037 n = strlen(bp) + 1; /* for the \0 */
2038 if (n >= MAXHOSTNAMELEN) {
2039 RES_SET_H_ERRNO(res, NO_RECOVERY);
2044 /* The qname can be abbreviated, but h_name is now absolute. */
2049 while (ancount-- > 0 && cp < eom && !had_error) {
2050 n = dn_expand(answer->buf, eom, cp, bp, ep - bp);
2051 if ((n < 0) || !(*name_ok)(bp)) {
2056 type = _getshort(cp);
2057 cp += INT16SZ; /* type */
2058 class = _getshort(cp);
2059 cp += INT16SZ + INT32SZ; /* class, TTL */
2061 cp += INT16SZ; /* len */
2062 if (class != C_IN) {
2063 /* XXX - debug? syslog? */
2065 continue; /* XXX - had_error++ ? */
2067 if ((qtype == T_A || qtype == T_AAAA || qtype == T_ANY) &&
2069 n = dn_expand(answer->buf, eom, cp, tbuf, sizeof tbuf);
2070 if ((n < 0) || !(*name_ok)(tbuf)) {
2075 /* Get canonical name. */
2076 n = strlen(tbuf) + 1; /* for the \0 */
2077 if (n > ep - bp || n >= MAXHOSTNAMELEN) {
2081 strlcpy(bp, tbuf, ep - bp);
2086 if (qtype == T_ANY) {
2087 if (!(type == T_A || type == T_AAAA)) {
2091 } else if (type != qtype) {
2093 if (type != T_KEY && type != T_SIG &&
2095 syslog(LOG_NOTICE|LOG_AUTH,
2096 "gethostby*.getanswer: asked for \"%s %s %s\", got type \"%s\"",
2097 qname, p_class(C_IN), p_type(qtype),
2101 continue; /* XXX - had_error++ ? */
2106 if (strcasecmp(canonname, bp) != 0) {
2108 syslog(LOG_NOTICE|LOG_AUTH,
2109 AskedForGot, canonname, bp);
2112 continue; /* XXX - had_error++ ? */
2114 if (type == T_A && n != INADDRSZ) {
2118 if (type == T_AAAA && n != IN6ADDRSZ) {
2122 #ifdef FILTER_V4MAPPED
2123 if (type == T_AAAA) {
2124 struct in6_addr in6;
2125 memcpy(&in6, cp, sizeof(in6));
2126 if (IN6_IS_ADDR_V4MAPPED(&in6)) {
2136 nn = strlen(bp) + 1; /* for the \0 */
2140 /* don't overwrite pai */
2142 ai.ai_family = (type == T_A) ? AF_INET : AF_INET6;
2143 afd = find_afd(ai.ai_family);
2148 cur->ai_next = get_ai(&ai, afd, (const char *)cp);
2149 if (cur->ai_next == NULL)
2151 while (cur && cur->ai_next)
2162 #if defined(RESOLVSORT)
2164 * We support only IPv4 address for backward
2165 * compatibility against gethostbyname(3).
2167 if (res->nsort && qtype == T_A) {
2168 if (addr4sort(&sentinel, res) < 0) {
2169 freeaddrinfo(sentinel.ai_next);
2170 RES_SET_H_ERRNO(res, NO_RECOVERY);
2174 #endif /*RESOLVSORT*/
2176 (void)get_canonname(pai, sentinel.ai_next, qname);
2178 (void)get_canonname(pai, sentinel.ai_next, canonname);
2179 RES_SET_H_ERRNO(res, NETDB_SUCCESS);
2180 return sentinel.ai_next;
2184 * We could have walked a CNAME chain, but the ultimate target
2185 * may not have what we looked for.
2187 RES_SET_H_ERRNO(res, ntohs(hp->ancount) > 0 ? NO_DATA : NO_RECOVERY);
2193 struct addrinfo *ai;
2198 addr4sort(struct addrinfo *sentinel, res_state res)
2200 struct addrinfo *ai;
2201 struct addr_ptr *addrs, addr;
2202 struct sockaddr_in *sin;
2209 for (ai = sentinel->ai_next; ai; ai = ai->ai_next)
2212 return 0; /* We don't need sorting. */
2213 if ((addrs = malloc(sizeof(struct addr_ptr) * naddrs)) == NULL)
2216 for (ai = sentinel->ai_next; ai; ai = ai->ai_next) {
2217 sin = (struct sockaddr_in *)ai->ai_addr;
2218 for (j = 0; (unsigned)j < res->nsort; j++) {
2219 if (res->sort_list[j].addr.s_addr ==
2220 (sin->sin_addr.s_addr & res->sort_list[j].mask))
2225 if (needsort == 0 && i > 0 && j < addrs[i - 1].aval)
2234 while (needsort < naddrs) {
2235 for (j = needsort - 1; j >= 0; j--) {
2236 if (addrs[j].aval > addrs[j+1].aval) {
2238 addrs[j] = addrs[j + 1];
2239 addrs[j + 1] = addr;
2247 for (i = 0; i < naddrs; ++i) {
2248 ai->ai_next = addrs[i].ai;
2255 #endif /*RESOLVSORT*/
2259 _dns_getaddrinfo(void *rv, void *cb_data, va_list ap)
2261 struct addrinfo *ai, ai0;
2262 querybuf *buf, *buf2;
2263 const char *hostname;
2264 const struct addrinfo *pai;
2265 struct addrinfo sentinel, *cur;
2266 struct res_target q, q2;
2271 hostname = va_arg(ap, char *);
2272 pai = va_arg(ap, const struct addrinfo *);
2274 memset(&q, 0, sizeof(q));
2275 memset(&q2, 0, sizeof(q2));
2276 memset(&sentinel, 0, sizeof(sentinel));
2279 res = __res_state();
2281 buf = malloc(sizeof(*buf));
2283 RES_SET_H_ERRNO(res, NETDB_INTERNAL);
2286 buf2 = malloc(sizeof(*buf2));
2289 RES_SET_H_ERRNO(res, NETDB_INTERNAL);
2293 if (pai->ai_family == AF_INET6 &&
2294 (pai->ai_flags & AI_V4MAPPED) == AI_V4MAPPED) {
2296 ai0.ai_family = AF_UNSPEC;
2300 switch (pai->ai_family) {
2305 q.answer = buf->buf;
2306 q.anslen = sizeof(buf->buf);
2311 q2.answer = buf2->buf;
2312 q2.anslen = sizeof(buf2->buf);
2318 q.answer = buf->buf;
2319 q.anslen = sizeof(buf->buf);
2325 q.answer = buf->buf;
2326 q.anslen = sizeof(buf->buf);
2334 if ((res->options & RES_INIT) == 0 && res_ninit(res) == -1) {
2335 RES_SET_H_ERRNO(res, NETDB_INTERNAL);
2341 if (res_searchN(hostname, &q, res) < 0) {
2348 ai = getanswer(buf2, q2.n, q2.name, q2.qtype, pai, res);
2351 while (cur && cur->ai_next)
2355 if (ai == NULL || pai->ai_family != AF_UNSPEC ||
2356 (pai->ai_flags & (AI_ALL | AI_V4MAPPED)) != AI_V4MAPPED) {
2357 ai = getanswer(buf, q.n, q.name, q.qtype, pai, res);
2363 if (sentinel.ai_next == NULL)
2364 switch (res->res_h_errno) {
2365 case HOST_NOT_FOUND:
2373 *((struct addrinfo **)rv) = sentinel.ai_next;
2378 _sethtent(FILE **hostf)
2381 *hostf = fopen(_PATH_HOSTS, "re");
2387 _endhtent(FILE **hostf)
2390 (void) fclose(*hostf);
2395 static struct addrinfo *
2396 _gethtent(FILE **hostf, const char *name, const struct addrinfo *pai)
2399 char *cp, *tname, *cname;
2400 struct addrinfo hints, *res0, *res;
2403 char hostbuf[8*1024];
2405 if (!*hostf && !(*hostf = fopen(_PATH_HOSTS, "re")))
2408 if (!(p = fgets(hostbuf, sizeof hostbuf, *hostf)))
2412 cp = strpbrk(p, "#\n");
2415 if (!(cp = strpbrk(p, " \t")))
2420 /* if this is not something we're looking for, skip it. */
2422 if (*cp == ' ' || *cp == '\t') {
2429 if ((cp = strpbrk(cp, " \t")) != NULL)
2431 if (strcasecmp(name, tname) == 0)
2437 /* we should not glob socktype/protocol here */
2438 memset(&hints, 0, sizeof(hints));
2439 hints.ai_family = pai->ai_family;
2440 hints.ai_socktype = SOCK_DGRAM;
2441 hints.ai_protocol = 0;
2442 hints.ai_flags = AI_NUMERICHOST;
2443 if (pai->ai_family == AF_INET6 &&
2444 (pai->ai_flags & AI_V4MAPPED) == AI_V4MAPPED)
2445 hints.ai_flags |= AI_V4MAPPED;
2446 error = getaddrinfo(addr, "0", &hints, &res0);
2449 #ifdef FILTER_V4MAPPED
2450 /* XXX should check all items in the chain */
2451 if (res0->ai_family == AF_INET6 &&
2452 IN6_IS_ADDR_V4MAPPED(&((struct sockaddr_in6 *)res0->ai_addr)->sin6_addr)) {
2457 for (res = res0; res; res = res->ai_next) {
2459 res->ai_flags = pai->ai_flags;
2460 res->ai_socktype = pai->ai_socktype;
2461 res->ai_protocol = pai->ai_protocol;
2463 if (pai->ai_flags & AI_CANONNAME) {
2464 if (get_canonname(pai, res, cname) != 0) {
2473 static struct addrinfo *
2474 _getht(FILE **hostf, const char *name, const struct addrinfo *pai,
2475 struct addrinfo *cur)
2479 while ((p = _gethtent(hostf, name, pai)) != NULL) {
2481 while (cur && cur->ai_next)
2489 _files_getaddrinfo(void *rv, void *cb_data, va_list ap)
2492 const struct addrinfo *pai;
2493 struct addrinfo sentinel, *cur;
2496 name = va_arg(ap, char *);
2497 pai = va_arg(ap, struct addrinfo *);
2499 memset(&sentinel, 0, sizeof(sentinel));
2503 if (pai->ai_family == AF_INET6 &&
2504 (pai->ai_flags & (AI_ALL | AI_V4MAPPED)) == AI_V4MAPPED) {
2505 struct addrinfo ai0 = *pai;
2507 ai0.ai_flags &= ~AI_V4MAPPED;
2508 cur = _getht(&hostf, name, &ai0, cur);
2509 if (sentinel.ai_next == NULL) {
2511 ai0.ai_flags |= AI_V4MAPPED;
2512 cur = _getht(&hostf, name, &ai0, cur);
2515 cur = _getht(&hostf, name, pai, cur);
2518 *((struct addrinfo **)rv) = sentinel.ai_next;
2519 if (sentinel.ai_next == NULL)
2526 static struct addrinfo *
2527 _yphostent(char *line, const struct addrinfo *pai)
2529 struct addrinfo sentinel, *cur;
2530 struct addrinfo hints, *res, *res0;
2533 const char *addr, *canonname;
2537 addr = canonname = NULL;
2539 memset(&sentinel, 0, sizeof(sentinel));
2543 /* terminate line */
2544 cp = strchr(p, '\n');
2551 cp = strpbrk(p, " \t");
2553 if (canonname == NULL)
2563 if (*cp == ' ' || *cp == '\t') {
2569 if ((cp = strpbrk(cp, " \t")) != NULL)
2574 hints.ai_flags = AI_NUMERICHOST;
2575 if (pai->ai_family == AF_INET6 &&
2576 (pai->ai_flags & AI_V4MAPPED) == AI_V4MAPPED)
2577 hints.ai_flags |= AI_V4MAPPED;
2578 error = getaddrinfo(addr, NULL, &hints, &res0);
2580 for (res = res0; res; res = res->ai_next) {
2582 res->ai_flags = pai->ai_flags;
2584 if (pai->ai_flags & AI_CANONNAME)
2585 (void)get_canonname(pai, res, canonname);
2590 cur->ai_next = res0;
2591 while (cur && cur->ai_next)
2601 return sentinel.ai_next;
2606 _yp_getaddrinfo(void *rv, void *cb_data, va_list ap)
2608 struct addrinfo sentinel, *cur;
2609 struct addrinfo *ai = NULL;
2613 const struct addrinfo *pai;
2616 if (_yp_check(&ypdomain) == 0)
2619 name = va_arg(ap, char *);
2620 pai = va_arg(ap, const struct addrinfo *);
2622 memset(&sentinel, 0, sizeof(sentinel));
2625 /* ipnodes.byname can hold both IPv4/v6 */
2626 r = yp_match(ypdomain, "ipnodes.byname", name,
2627 (int)strlen(name), &ypbuf, &ypbuflen);
2629 ai = _yphostent(ypbuf, pai);
2632 while (cur && cur->ai_next)
2639 struct sockaddr_in6 *sin6;
2641 switch (ai->ai_family) {
2645 sin6 = (struct sockaddr_in6 *)ai->ai_addr;
2646 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr))
2652 /* hosts.byname is only for IPv4 (Solaris8) */
2653 if (pai->ai_family == AF_UNSPEC || pai->ai_family == AF_INET ||
2654 ((pai->ai_family == AF_INET6 &&
2655 (pai->ai_flags & AI_V4MAPPED) == AI_V4MAPPED) &&
2656 (ai == NULL || (pai->ai_flags & AI_ALL) == AI_ALL))) {
2657 r = yp_match(ypdomain, "hosts.byname", name,
2658 (int)strlen(name), &ypbuf, &ypbuflen);
2660 struct addrinfo ai4;
2663 if (pai->ai_family == AF_UNSPEC)
2664 ai4.ai_family = AF_INET;
2665 ai = _yphostent(ypbuf, &ai4);
2668 while (cur && cur->ai_next)
2676 if (sentinel.ai_next == NULL) {
2677 RES_SET_H_ERRNO(__res_state(), HOST_NOT_FOUND);
2680 *((struct addrinfo **)rv) = sentinel.ai_next;
2685 /* resolver logic */
2688 * Formulate a normal query, send, and await answer.
2689 * Returned answer is placed in supplied buffer "answer".
2690 * Perform preliminary check of answer, returning success only
2691 * if no error is indicated and the answer count is nonzero.
2692 * Return the size of the response on success, -1 on error.
2693 * Error number is left in h_errno.
2695 * Caller must parse answer and determine whether it answers the question.
2698 res_queryN(const char *name, struct res_target *target, res_state res)
2704 struct res_target *t;
2711 buf = malloc(MAXPACKET);
2713 RES_SET_H_ERRNO(res, NETDB_INTERNAL);
2717 for (t = target; t; t = t->next) {
2722 hp = (HEADER *)(void *)t->answer;
2724 /* make it easier... */
2730 oflags = res->_flags;
2733 hp->rcode = NOERROR; /* default */
2736 if (res->options & RES_DEBUG)
2737 printf(";; res_query(%s, %d, %d)\n", name, class, type);
2740 n = res_nmkquery(res, QUERY, name, class, type, NULL, 0, NULL,
2742 if (n > 0 && (res->_flags & RES_F_EDNS0ERR) == 0 &&
2743 (res->options & (RES_USE_EDNS0|RES_USE_DNSSEC)) != 0U)
2744 n = res_nopt(res, n, buf, MAXPACKET, anslen);
2747 if (res->options & RES_DEBUG)
2748 printf(";; res_query: mkquery failed\n");
2751 RES_SET_H_ERRNO(res, NO_RECOVERY);
2754 n = res_nsend(res, buf, n, answer, anslen);
2757 * if the query choked with EDNS0, retry
2760 if ((res->options & (RES_USE_EDNS0|RES_USE_DNSSEC))
2762 ((oflags ^ res->_flags) & RES_F_EDNS0ERR) != 0) {
2763 res->_flags |= RES_F_EDNS0ERR;
2764 if (res->options & RES_DEBUG)
2765 printf(";; res_nquery: retry without EDNS0\n");
2768 rcode = hp->rcode; /* record most recent error */
2770 if (res->options & RES_DEBUG)
2771 printf(";; res_query: send error\n");
2777 hp->rcode = FORMERR; /* XXX not very informative */
2778 if (hp->rcode != NOERROR || ntohs(hp->ancount) == 0) {
2779 rcode = hp->rcode; /* record most recent error */
2781 if (res->options & RES_DEBUG)
2782 printf(";; rcode = %u, ancount=%u\n", hp->rcode,
2783 ntohs(hp->ancount));
2788 ancount += ntohs(hp->ancount);
2798 RES_SET_H_ERRNO(res, HOST_NOT_FOUND);
2801 RES_SET_H_ERRNO(res, TRY_AGAIN);
2804 RES_SET_H_ERRNO(res, NO_DATA);
2810 RES_SET_H_ERRNO(res, NO_RECOVERY);
2819 * Formulate a normal query, send, and retrieve answer in supplied buffer.
2820 * Return the size of the response on success, -1 on error.
2821 * If enabled, implement search rules until answer or unrecoverable failure
2822 * is detected. Error code, if any, is left in h_errno.
2825 res_searchN(const char *name, struct res_target *target, res_state res)
2827 const char *cp, * const *domain;
2828 HEADER *hp = (HEADER *)(void *)target->answer; /*XXX*/
2830 int trailing_dot, ret, saved_herrno;
2831 int got_nodata = 0, got_servfail = 0, root_on_list = 0;
2832 int tried_as_is = 0;
2834 char abuf[MAXDNAME];
2837 RES_SET_H_ERRNO(res, HOST_NOT_FOUND); /* default, if we never query */
2839 for (cp = name; *cp; cp++)
2840 dots += (*cp == '.');
2842 if (cp > name && *--cp == '.')
2846 * if there aren't any dots, it could be a user-level alias
2849 (cp = res_hostalias(res, name, abuf, sizeof(abuf))) != NULL)
2850 return (res_queryN(cp, target, res));
2853 * If there are enough dots in the name, let's just give it a
2854 * try 'as is'. The threshold can be set with the "ndots" option.
2855 * Also, query 'as is', if there is a trailing dot in the name.
2858 if (dots >= res->ndots || trailing_dot) {
2859 ret = res_querydomainN(name, NULL, target, res);
2860 if (ret > 0 || trailing_dot)
2862 if (errno == ECONNREFUSED) {
2863 RES_SET_H_ERRNO(res, TRY_AGAIN);
2866 switch (res->res_h_errno) {
2868 case HOST_NOT_FOUND:
2871 if (hp->rcode == SERVFAIL)
2877 saved_herrno = res->res_h_errno;
2882 * We do at least one level of search if
2883 * - there is no dot and RES_DEFNAME is set, or
2884 * - there is at least one dot, there is no trailing dot,
2885 * and RES_DNSRCH is set.
2887 if ((!dots && (res->options & RES_DEFNAMES)) ||
2888 (dots && !trailing_dot && (res->options & RES_DNSRCH))) {
2891 for (domain = (const char * const *)res->dnsrch;
2896 if (domain[0][0] == '\0' ||
2897 (domain[0][0] == '.' && domain[0][1] == '\0'))
2900 if (root_on_list && tried_as_is)
2903 ret = res_querydomainN(name, *domain, target, res);
2908 * If no server present, give up.
2909 * If name isn't found in this domain,
2910 * keep trying higher domains in the search list
2911 * (if that's enabled).
2912 * On a NO_DATA error, keep trying, otherwise
2913 * a wildcard entry of another type could keep us
2914 * from finding this entry higher in the domain.
2915 * If we get some other error (negative answer or
2916 * server failure), then stop searching up,
2917 * but try the input name below in case it's
2920 if (errno == ECONNREFUSED) {
2921 RES_SET_H_ERRNO(res, TRY_AGAIN);
2925 switch (res->res_h_errno) {
2929 case HOST_NOT_FOUND:
2934 if (hp->rcode == SERVFAIL) {
2935 /* try next search element, if any */
2940 /* anything else implies that we're done */
2944 * if we got here for some reason other than DNSRCH,
2945 * we only wanted one iteration of the loop, so stop.
2947 if (!(res->options & RES_DNSRCH))
2952 switch (res->res_h_errno) {
2954 case HOST_NOT_FOUND:
2957 if (hp->rcode == SERVFAIL)
2965 * If the query has not already been tried as is then try it
2966 * unless RES_NOTLDQUERY is set and there were no dots.
2968 if ((dots || !searched || !(res->options & RES_NOTLDQUERY)) &&
2969 !(tried_as_is || root_on_list)) {
2970 ret = res_querydomainN(name, NULL, target, res);
2976 * if we got here, we didn't satisfy the search.
2977 * if we did an initial full query, return that query's h_errno
2978 * (note that we wouldn't be here if that query had succeeded).
2979 * else if we ever got a nodata, send that back as the reason.
2980 * else send back meaningless h_errno, that being the one from
2981 * the last DNSRCH we did.
2984 if (saved_herrno != -1)
2985 RES_SET_H_ERRNO(res, saved_herrno);
2986 else if (got_nodata)
2987 RES_SET_H_ERRNO(res, NO_DATA);
2988 else if (got_servfail)
2989 RES_SET_H_ERRNO(res, TRY_AGAIN);
2994 * Perform a call on res_query on the concatenation of name and domain,
2995 * removing a trailing dot from name if domain is NULL.
2998 res_querydomainN(const char *name, const char *domain,
2999 struct res_target *target, res_state res)
3001 char nbuf[MAXDNAME];
3002 const char *longname = nbuf;
3006 if (res->options & RES_DEBUG)
3007 printf(";; res_querydomain(%s, %s)\n",
3008 name, domain?domain:"<Nil>");
3010 if (domain == NULL) {
3012 * Check for trailing '.';
3013 * copy without '.' if present.
3016 if (n >= MAXDNAME) {
3017 RES_SET_H_ERRNO(res, NO_RECOVERY);
3020 if (n > 0 && name[--n] == '.') {
3021 strncpy(nbuf, name, n);
3028 if (n + d + 1 >= MAXDNAME) {
3029 RES_SET_H_ERRNO(res, NO_RECOVERY);
3032 snprintf(nbuf, sizeof(nbuf), "%s.%s", name, domain);
3034 return (res_queryN(longname, target, res));