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},
162 const char *e_protostr;
164 #define WILD_AF(ex) ((ex)->e_wild & 0x01)
165 #define WILD_SOCKTYPE(ex) ((ex)->e_wild & 0x02)
166 #define WILD_PROTOCOL(ex) ((ex)->e_wild & 0x04)
169 static const struct explore explore[] = {
171 { PF_LOCAL, ANY, ANY, NULL, 0x01 },
174 { PF_INET6, SOCK_DGRAM, IPPROTO_UDP, "udp", 0x07 },
175 { PF_INET6, SOCK_STREAM, IPPROTO_TCP, "tcp", 0x07 },
176 { PF_INET6, SOCK_STREAM, IPPROTO_SCTP, "sctp", 0x03 },
177 { PF_INET6, SOCK_SEQPACKET, IPPROTO_SCTP, "sctp", 0x07 },
178 { PF_INET6, SOCK_RAW, ANY, NULL, 0x05 },
180 { PF_INET, SOCK_DGRAM, IPPROTO_UDP, "udp", 0x07 },
181 { PF_INET, SOCK_STREAM, IPPROTO_TCP, "tcp", 0x07 },
182 { PF_INET, SOCK_STREAM, IPPROTO_SCTP, "sctp", 0x03 },
183 { PF_INET, SOCK_SEQPACKET, IPPROTO_SCTP, "sctp", 0x07 },
184 { PF_INET, SOCK_RAW, ANY, NULL, 0x05 },
185 { -1, 0, 0, NULL, 0 },
194 #define AIO_SRCFLAG_DEPRECATED 0x1
198 struct sockaddr_storage aiou_ss;
199 struct sockaddr aiou_sa;
201 #define aio_srcsa aio_src_un.aiou_sa
202 u_int32_t aio_srcflag;
205 struct policyqueue *aio_srcpolicy;
206 struct policyqueue *aio_dstpolicy;
207 struct addrinfo *aio_ai;
211 static const ns_src default_dns_files[] = {
212 { NSSRC_FILES, NS_SUCCESS },
213 { NSSRC_DNS, NS_SUCCESS },
218 struct res_target *next;
219 const char *name; /* domain name */
220 int qclass, qtype; /* class and type of query */
221 u_char *answer; /* buffer to put answer */
222 int anslen; /* size of answer buffer */
223 int n; /* result length */
226 #define MAXPACKET (64*1024)
230 u_char buf[MAXPACKET];
233 static int str2number(const char *, int *);
234 static int explore_copy(const struct addrinfo *, const struct addrinfo *,
236 static int explore_null(const struct addrinfo *,
237 const char *, struct addrinfo **);
238 static int explore_numeric(const struct addrinfo *, const char *,
239 const char *, struct addrinfo **, const char *);
240 static int explore_numeric_scope(const struct addrinfo *, const char *,
241 const char *, struct addrinfo **);
242 static int get_canonname(const struct addrinfo *,
243 struct addrinfo *, const char *);
244 static struct addrinfo *get_ai(const struct addrinfo *,
245 const struct afd *, const char *);
246 static struct addrinfo *copy_ai(const struct addrinfo *);
247 static int get_portmatch(const struct addrinfo *, const char *);
248 static int get_port(struct addrinfo *, const char *, int);
249 static const struct afd *find_afd(int);
250 static int addrconfig(struct addrinfo *);
252 static int is_ifdisabled(char *);
254 static void set_source(struct ai_order *, struct policyhead *);
255 static int comp_dst(const void *, const void *);
257 static int ip6_str2scopeid(char *, struct sockaddr_in6 *, u_int32_t *);
259 static int gai_addr2scopetype(struct sockaddr *);
261 static int explore_fqdn(const struct addrinfo *, const char *,
262 const char *, struct addrinfo **);
264 static int reorder(struct addrinfo *);
265 static int get_addrselectpolicy(struct policyhead *);
266 static void free_addrselectpolicy(struct policyhead *);
267 static struct policyqueue *match_addrselectpolicy(struct sockaddr *,
268 struct policyhead *);
269 static int matchlen(struct sockaddr *, struct sockaddr *);
271 static struct addrinfo *getanswer(const querybuf *, int, const char *, int,
272 const struct addrinfo *, res_state);
273 #if defined(RESOLVSORT)
274 static int addr4sort(struct addrinfo *, res_state);
276 static int _dns_getaddrinfo(void *, void *, va_list);
277 static void _sethtent(FILE **);
278 static void _endhtent(FILE **);
279 static struct addrinfo *_gethtent(FILE **, const char *,
280 const struct addrinfo *);
281 static int _files_getaddrinfo(void *, void *, va_list);
283 static struct addrinfo *_yphostent(char *, const struct addrinfo *);
284 static int _yp_getaddrinfo(void *, void *, va_list);
287 static int addrinfo_id_func(char *, size_t *, va_list, void *);
288 static int addrinfo_marshal_func(char *, size_t *, void *, va_list, void *);
289 static int addrinfo_unmarshal_func(char *, size_t, void *, va_list, void *);
292 static int res_queryN(const char *, struct res_target *, res_state);
293 static int res_searchN(const char *, struct res_target *, res_state);
294 static int res_querydomainN(const char *, const char *,
295 struct res_target *, res_state);
297 /* XXX macros that make external reference is BAD. */
299 #define GET_AI(ai, afd, addr) \
301 /* external reference: pai, error, and label free */ \
302 (ai) = get_ai(pai, (afd), (addr)); \
303 if ((ai) == NULL) { \
304 error = EAI_MEMORY; \
307 } while (/*CONSTCOND*/0)
309 #define GET_PORT(ai, serv) \
311 /* external reference: error and label free */ \
312 error = get_port((ai), (serv), 0); \
315 } while (/*CONSTCOND*/0)
317 #define GET_CANONNAME(ai, str) \
319 /* external reference: pai, error and label free */ \
320 error = get_canonname(pai, (ai), (str)); \
323 } while (/*CONSTCOND*/0)
327 /* external reference: error, and label bad */ \
331 } while (/*CONSTCOND*/0)
333 #define MATCH_FAMILY(x, y, w) \
334 ((x) == (y) || (/*CONSTCOND*/(w) && ((x) == PF_UNSPEC || (y) == PF_UNSPEC)))
335 #define MATCH(x, y, w) \
336 ((x) == (y) || (/*CONSTCOND*/(w) && ((x) == ANY || (y) == ANY)))
339 freeaddrinfo(struct addrinfo *ai)
341 struct addrinfo *next;
345 if (ai->ai_canonname)
346 free(ai->ai_canonname);
347 /* no need to free(ai->ai_addr) */
354 str2number(const char *p, int *portp)
363 v = strtoul(p, &ep, 10);
364 if (errno == 0 && ep && *ep == '\0' && v <= UINT_MAX) {
372 getaddrinfo(const char *hostname, const char *servname,
373 const struct addrinfo *hints, struct addrinfo **res)
375 struct addrinfo sentinel;
376 struct addrinfo *cur;
378 struct addrinfo ai, ai0, *afai;
379 struct addrinfo *pai;
380 const struct afd *afd;
381 const struct explore *ex;
382 struct addrinfo *afailist[sizeof(afdl)/sizeof(afdl[0])];
383 struct addrinfo *afai_unspec;
387 /* ensure we return NULL on errors */
390 memset(&ai, 0, sizeof(ai));
392 memset(afailist, 0, sizeof(afailist));
395 memset(&sentinel, 0, sizeof(sentinel));
399 pai->ai_family = PF_UNSPEC;
400 pai->ai_socktype = ANY;
401 pai->ai_protocol = ANY;
403 pai->ai_canonname = NULL;
407 if (hostname == NULL && servname == NULL)
410 /* error check for hints */
411 if (hints->ai_addrlen || hints->ai_canonname ||
412 hints->ai_addr || hints->ai_next)
413 ERR(EAI_BADHINTS); /* xxx */
414 if (hints->ai_flags & ~AI_MASK)
416 switch (hints->ai_family) {
426 memcpy(pai, hints, sizeof(*pai));
429 * if both socktype/protocol are specified, check if they
430 * are meaningful combination.
432 if (pai->ai_socktype != ANY && pai->ai_protocol != ANY) {
433 for (ex = explore; ex->e_af >= 0; ex++) {
434 if (!MATCH_FAMILY(pai->ai_family, ex->e_af,
437 if (!MATCH(pai->ai_socktype, ex->e_socktype,
440 if (!MATCH(pai->ai_protocol, ex->e_protocol,
454 * RFC 3493: AI_ALL and AI_V4MAPPED are effective only against
455 * AF_INET6 query. They need to be ignored if specified in other
458 switch (pai->ai_flags & (AI_ALL | AI_V4MAPPED)) {
460 case AI_ALL | AI_V4MAPPED:
462 if (pai->ai_family != AF_INET6)
463 pai->ai_flags &= ~(AI_ALL | AI_V4MAPPED);
467 pai->ai_flags &= ~(AI_ALL | AI_V4MAPPED);
472 * check for special cases. (1) numeric servname is disallowed if
473 * socktype/protocol are left unspecified. (2) servname is disallowed
474 * for raw and other inet{,6} sockets.
476 if (MATCH_FAMILY(pai->ai_family, PF_INET, 1)
478 || MATCH_FAMILY(pai->ai_family, PF_INET6, 1)
481 ai0 = *pai; /* backup *pai */
483 if (pai->ai_family == PF_UNSPEC) {
485 pai->ai_family = PF_INET6;
487 pai->ai_family = PF_INET;
490 error = get_portmatch(pai, servname);
500 * NULL hostname, or numeric hostname.
501 * If numeric representation of AF1 can be interpreted as FQDN
502 * representation of AF2, we need to think again about the code below.
505 for (afd = afdl; afd->a_af; afd++) {
508 if (!MATCH_FAMILY(pai->ai_family, afd->a_af, 1))
511 if (pai->ai_family == PF_UNSPEC)
512 pai->ai_family = afd->a_af;
514 if (hostname == NULL) {
515 error = explore_null(pai, servname,
516 &afailist[afd - afdl]);
519 * Errors from explore_null should be unexpected and
520 * be caught to avoid returning an incomplete result.
525 error = explore_numeric_scope(pai, hostname, servname,
526 &afailist[afd - afdl]);
529 * explore_numeric_scope returns an error for address
530 * families that do not match that of hostname.
531 * Thus we should not catch the error at this moment.
535 if (!error && afailist[afd - afdl])
543 if (hostname == NULL)
544 ERR(EAI_NONAME); /* used to be EAI_NODATA */
545 if (pai->ai_flags & AI_NUMERICHOST)
548 if ((pai->ai_flags & AI_ADDRCONFIG) != 0 && !addrconfig(&ai0))
552 * hostname as alphabetical name.
555 error = explore_fqdn(pai, hostname, servname, &afai_unspec);
558 for (ex = explore; ex->e_af >= 0; ex++) {
561 if (!MATCH_FAMILY(pai->ai_family, ex->e_af, WILD_AF(ex)))
563 if (!MATCH(pai->ai_socktype, ex->e_socktype,
566 if (!MATCH(pai->ai_protocol, ex->e_protocol,
570 if (pai->ai_family == PF_UNSPEC)
571 pai->ai_family = ex->e_af;
572 if (pai->ai_socktype == ANY && ex->e_socktype != ANY)
573 pai->ai_socktype = ex->e_socktype;
574 if (pai->ai_protocol == ANY && ex->e_protocol != ANY)
575 pai->ai_protocol = ex->e_protocol;
578 * if the servname does not match socktype/protocol, ignore it.
580 if (get_portmatch(pai, servname) != 0)
586 if ((afd = find_afd(pai->ai_family)) == NULL)
588 /* XXX assumes that afd points inside afdl[] */
589 afai = afailist[afd - afdl];
594 error = explore_copy(pai, afai, &cur->ai_next);
598 while (cur && cur->ai_next)
603 * ensure we return either:
604 * - error == 0, non-NULL *res
605 * - error != 0, NULL *res
608 if (sentinel.ai_next) {
610 * If the returned entry is for an active connection,
611 * and the given name is not numeric, reorder the
612 * list, so that the application would try the list
613 * in the most efficient order. Since the head entry
614 * of the original list may contain ai_canonname and
615 * that entry may be moved elsewhere in the new list,
616 * we keep the pointer and will restore it in the new
617 * head entry. (Note that RFC3493 requires the head
618 * entry store it when requested by the caller).
620 if (hints == NULL || !(hints->ai_flags & AI_PASSIVE)) {
625 sentinel.ai_next->ai_canonname;
626 sentinel.ai_next->ai_canonname = NULL;
627 (void)reorder(&sentinel);
628 if (sentinel.ai_next->ai_canonname ==
630 sentinel.ai_next->ai_canonname
632 } else if (canonname != NULL)
636 *res = sentinel.ai_next;
643 freeaddrinfo(afai_unspec);
644 for (afd = afdl; afd->a_af; afd++) {
645 if (afailist[afd - afdl])
646 freeaddrinfo(afailist[afd - afdl]);
649 if (sentinel.ai_next)
650 freeaddrinfo(sentinel.ai_next);
656 reorder(struct addrinfo *sentinel)
658 struct addrinfo *ai, **aip;
659 struct ai_order *aio;
661 struct policyhead policyhead;
663 /* count the number of addrinfo elements for sorting. */
664 for (n = 0, ai = sentinel->ai_next; ai != NULL; ai = ai->ai_next, n++)
668 * If the number is small enough, we can skip the reordering process.
673 /* allocate a temporary array for sort and initialization of it. */
674 if ((aio = malloc(sizeof(*aio) * n)) == NULL)
675 return(n); /* give up reordering */
676 memset(aio, 0, sizeof(*aio) * n);
678 /* retrieve address selection policy from the kernel */
679 TAILQ_INIT(&policyhead);
680 if (!get_addrselectpolicy(&policyhead)) {
681 /* no policy is installed into kernel, we don't sort. */
686 for (i = 0, ai = sentinel->ai_next; i < n; ai = ai->ai_next, i++) {
688 aio[i].aio_dstscope = gai_addr2scopetype(ai->ai_addr);
689 aio[i].aio_dstpolicy = match_addrselectpolicy(ai->ai_addr,
691 set_source(&aio[i], &policyhead);
694 /* perform sorting. */
695 qsort(aio, n, sizeof(*aio), comp_dst);
697 /* reorder the addrinfo chain. */
698 for (i = 0, aip = &sentinel->ai_next; i < n; i++) {
699 *aip = aio[i].aio_ai;
700 aip = &aio[i].aio_ai->ai_next;
704 /* cleanup and return */
706 free_addrselectpolicy(&policyhead);
711 get_addrselectpolicy(struct policyhead *head)
714 int mib[] = { CTL_NET, PF_INET6, IPPROTO_IPV6, IPV6CTL_ADDRCTLPOLICY };
717 struct in6_addrpolicy *pol, *ep;
719 if (sysctl(mib, sizeof(mib) / sizeof(mib[0]), NULL, &l, NULL, 0) < 0)
723 if ((buf = malloc(l)) == NULL)
725 if (sysctl(mib, sizeof(mib) / sizeof(mib[0]), buf, &l, NULL, 0) < 0) {
730 ep = (struct in6_addrpolicy *)(buf + l);
731 for (pol = (struct in6_addrpolicy *)buf; pol + 1 <= ep; pol++) {
732 struct policyqueue *new;
734 if ((new = malloc(sizeof(*new))) == NULL) {
735 free_addrselectpolicy(head); /* make the list empty */
738 new->pc_policy = *pol;
739 TAILQ_INSERT_TAIL(head, new, pc_entry);
750 free_addrselectpolicy(struct policyhead *head)
752 struct policyqueue *ent, *nent;
754 for (ent = TAILQ_FIRST(head); ent; ent = nent) {
755 nent = TAILQ_NEXT(ent, pc_entry);
756 TAILQ_REMOVE(head, ent, pc_entry);
761 static struct policyqueue *
762 match_addrselectpolicy(struct sockaddr *addr, struct policyhead *head)
765 struct policyqueue *ent, *bestent = NULL;
766 struct in6_addrpolicy *pol;
767 int matchlen, bestmatchlen = -1;
768 u_char *mp, *ep, *k, *p, m;
769 struct sockaddr_in6 key;
771 switch(addr->sa_family) {
773 key = *(struct sockaddr_in6 *)addr;
776 /* convert the address into IPv4-mapped IPv6 address. */
777 memset(&key, 0, sizeof(key));
778 key.sin6_family = AF_INET6;
779 key.sin6_len = sizeof(key);
780 key.sin6_addr.s6_addr[10] = 0xff;
781 key.sin6_addr.s6_addr[11] = 0xff;
782 memcpy(&key.sin6_addr.s6_addr[12],
783 &((struct sockaddr_in *)addr)->sin_addr, 4);
789 for (ent = TAILQ_FIRST(head); ent; ent = TAILQ_NEXT(ent, pc_entry)) {
790 pol = &ent->pc_policy;
793 mp = (u_char *)&pol->addrmask.sin6_addr;
794 ep = mp + 16; /* XXX: scope field? */
795 k = (u_char *)&key.sin6_addr;
796 p = (u_char *)&pol->addr.sin6_addr;
797 for (; mp < ep && *mp; mp++, k++, p++) {
800 goto next; /* not match */
801 if (m == 0xff) /* short cut for a typical case */
811 /* matched. check if this is better than the current best. */
812 if (matchlen > bestmatchlen) {
814 bestmatchlen = matchlen;
829 set_source(struct ai_order *aio, struct policyhead *ph)
831 struct addrinfo ai = *aio->aio_ai;
832 struct sockaddr_storage ss;
836 /* set unspec ("no source is available"), just in case */
837 aio->aio_srcsa.sa_family = AF_UNSPEC;
838 aio->aio_srcscope = -1;
840 switch(ai.ai_family) {
846 default: /* ignore unsupported AFs explicitly */
850 /* XXX: make a dummy addrinfo to call connect() */
851 ai.ai_socktype = SOCK_DGRAM;
852 ai.ai_protocol = IPPROTO_UDP; /* is UDP too specific? */
854 memset(&ss, 0, sizeof(ss));
855 memcpy(&ss, ai.ai_addr, ai.ai_addrlen);
856 ai.ai_addr = (struct sockaddr *)&ss;
857 get_port(&ai, "1", 0);
859 /* open a socket to get the source address for the given dst */
860 if ((s = _socket(ai.ai_family, ai.ai_socktype, ai.ai_protocol)) < 0)
861 return; /* give up */
863 if (ai.ai_family == AF_INET6) {
864 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)ai.ai_addr;
867 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr))
868 (void)_setsockopt(s, IPPROTO_IPV6, IPV6_V6ONLY,
869 (char *)&off, sizeof(off));
872 if (_connect(s, ai.ai_addr, ai.ai_addrlen) < 0)
874 srclen = ai.ai_addrlen;
875 if (_getsockname(s, &aio->aio_srcsa, &srclen) < 0) {
876 aio->aio_srcsa.sa_family = AF_UNSPEC;
879 aio->aio_srcscope = gai_addr2scopetype(&aio->aio_srcsa);
880 aio->aio_srcpolicy = match_addrselectpolicy(&aio->aio_srcsa, ph);
881 aio->aio_matchlen = matchlen(&aio->aio_srcsa, aio->aio_ai->ai_addr);
883 if (ai.ai_family == AF_INET6) {
884 struct in6_ifreq ifr6;
887 memset(&ifr6, 0, sizeof(ifr6));
888 memcpy(&ifr6.ifr_addr, ai.ai_addr, ai.ai_addrlen);
889 if (_ioctl(s, SIOCGIFAFLAG_IN6, &ifr6) == 0) {
890 flags6 = ifr6.ifr_ifru.ifru_flags6;
891 if ((flags6 & IN6_IFF_DEPRECATED))
892 aio->aio_srcflag |= AIO_SRCFLAG_DEPRECATED;
903 matchlen(struct sockaddr *src, struct sockaddr *dst)
910 switch (src->sa_family) {
913 s = (u_char *)&((struct sockaddr_in6 *)src)->sin6_addr;
914 d = (u_char *)&((struct sockaddr_in6 *)dst)->sin6_addr;
915 addrlen = sizeof(struct in6_addr);
920 s = (u_char *)&((struct sockaddr_in *)src)->sin_addr;
921 d = (u_char *)&((struct sockaddr_in *)dst)->sin_addr;
922 addrlen = sizeof(struct in_addr);
930 if ((r = (*d++ ^ *s++)) != 0) {
931 while (r < addrlen * 8) {
942 comp_dst(const void *arg1, const void *arg2)
944 const struct ai_order *dst1 = arg1, *dst2 = arg2;
947 * Rule 1: Avoid unusable destinations.
948 * XXX: we currently do not consider if an appropriate route exists.
950 if (dst1->aio_srcsa.sa_family != AF_UNSPEC &&
951 dst2->aio_srcsa.sa_family == AF_UNSPEC) {
954 if (dst1->aio_srcsa.sa_family == AF_UNSPEC &&
955 dst2->aio_srcsa.sa_family != AF_UNSPEC) {
959 /* Rule 2: Prefer matching scope. */
960 if (dst1->aio_dstscope == dst1->aio_srcscope &&
961 dst2->aio_dstscope != dst2->aio_srcscope) {
964 if (dst1->aio_dstscope != dst1->aio_srcscope &&
965 dst2->aio_dstscope == dst2->aio_srcscope) {
969 /* Rule 3: Avoid deprecated addresses. */
970 if (dst1->aio_srcsa.sa_family != AF_UNSPEC &&
971 dst2->aio_srcsa.sa_family != AF_UNSPEC) {
972 if (!(dst1->aio_srcflag & AIO_SRCFLAG_DEPRECATED) &&
973 (dst2->aio_srcflag & AIO_SRCFLAG_DEPRECATED)) {
976 if ((dst1->aio_srcflag & AIO_SRCFLAG_DEPRECATED) &&
977 !(dst2->aio_srcflag & AIO_SRCFLAG_DEPRECATED)) {
982 /* Rule 4: Prefer home addresses. */
983 /* XXX: not implemented yet */
985 /* Rule 5: Prefer matching label. */
987 if (dst1->aio_srcpolicy && dst1->aio_dstpolicy &&
988 dst1->aio_srcpolicy->pc_policy.label ==
989 dst1->aio_dstpolicy->pc_policy.label &&
990 (dst2->aio_srcpolicy == NULL || dst2->aio_dstpolicy == NULL ||
991 dst2->aio_srcpolicy->pc_policy.label !=
992 dst2->aio_dstpolicy->pc_policy.label)) {
995 if (dst2->aio_srcpolicy && dst2->aio_dstpolicy &&
996 dst2->aio_srcpolicy->pc_policy.label ==
997 dst2->aio_dstpolicy->pc_policy.label &&
998 (dst1->aio_srcpolicy == NULL || dst1->aio_dstpolicy == NULL ||
999 dst1->aio_srcpolicy->pc_policy.label !=
1000 dst1->aio_dstpolicy->pc_policy.label)) {
1005 /* Rule 6: Prefer higher precedence. */
1007 if (dst1->aio_dstpolicy &&
1008 (dst2->aio_dstpolicy == NULL ||
1009 dst1->aio_dstpolicy->pc_policy.preced >
1010 dst2->aio_dstpolicy->pc_policy.preced)) {
1013 if (dst2->aio_dstpolicy &&
1014 (dst1->aio_dstpolicy == NULL ||
1015 dst2->aio_dstpolicy->pc_policy.preced >
1016 dst1->aio_dstpolicy->pc_policy.preced)) {
1021 /* Rule 7: Prefer native transport. */
1022 /* XXX: not implemented yet */
1024 /* Rule 8: Prefer smaller scope. */
1025 if (dst1->aio_dstscope >= 0 &&
1026 dst1->aio_dstscope < dst2->aio_dstscope) {
1029 if (dst2->aio_dstscope >= 0 &&
1030 dst2->aio_dstscope < dst1->aio_dstscope) {
1035 * Rule 9: Use longest matching prefix.
1036 * We compare the match length in a same AF only.
1038 if (dst1->aio_ai->ai_addr->sa_family ==
1039 dst2->aio_ai->ai_addr->sa_family &&
1040 dst1->aio_ai->ai_addr->sa_family != AF_INET) {
1041 if (dst1->aio_matchlen > dst2->aio_matchlen) {
1044 if (dst1->aio_matchlen < dst2->aio_matchlen) {
1049 /* Rule 10: Otherwise, leave the order unchanged. */
1054 * Copy from scope.c.
1055 * XXX: we should standardize the functions and link them as standard
1059 gai_addr2scopetype(struct sockaddr *sa)
1062 struct sockaddr_in6 *sa6;
1064 struct sockaddr_in *sa4;
1066 switch(sa->sa_family) {
1069 sa6 = (struct sockaddr_in6 *)sa;
1070 if (IN6_IS_ADDR_MULTICAST(&sa6->sin6_addr)) {
1071 /* just use the scope field of the multicast address */
1072 return(sa6->sin6_addr.s6_addr[2] & 0x0f);
1075 * Unicast addresses: map scope type to corresponding scope
1076 * value defined for multcast addresses.
1077 * XXX: hardcoded scope type values are bad...
1079 if (IN6_IS_ADDR_LOOPBACK(&sa6->sin6_addr))
1080 return(1); /* node local scope */
1081 if (IN6_IS_ADDR_LINKLOCAL(&sa6->sin6_addr))
1082 return(2); /* link-local scope */
1083 if (IN6_IS_ADDR_SITELOCAL(&sa6->sin6_addr))
1084 return(5); /* site-local scope */
1085 return(14); /* global scope */
1090 * IPv4 pseudo scoping according to RFC 3484.
1092 sa4 = (struct sockaddr_in *)sa;
1093 /* IPv4 autoconfiguration addresses have link-local scope. */
1094 if (((u_char *)&sa4->sin_addr)[0] == 169 &&
1095 ((u_char *)&sa4->sin_addr)[1] == 254)
1097 /* Private addresses have site-local scope. */
1098 if (((u_char *)&sa4->sin_addr)[0] == 10 ||
1099 (((u_char *)&sa4->sin_addr)[0] == 172 &&
1100 (((u_char *)&sa4->sin_addr)[1] & 0xf0) == 16) ||
1101 (((u_char *)&sa4->sin_addr)[0] == 192 &&
1102 ((u_char *)&sa4->sin_addr)[1] == 168))
1103 return(14); /* XXX: It should be 5 unless NAT */
1104 /* Loopback addresses have link-local scope. */
1105 if (((u_char *)&sa4->sin_addr)[0] == 127)
1110 errno = EAFNOSUPPORT; /* is this a good error? */
1116 explore_copy(const struct addrinfo *pai, const struct addrinfo *src0,
1117 struct addrinfo **res)
1120 struct addrinfo sentinel, *cur;
1121 const struct addrinfo *src;
1124 sentinel.ai_next = NULL;
1127 for (src = src0; src != NULL; src = src->ai_next) {
1128 if (src->ai_family != pai->ai_family)
1131 cur->ai_next = copy_ai(src);
1132 if (!cur->ai_next) {
1137 cur->ai_next->ai_socktype = pai->ai_socktype;
1138 cur->ai_next->ai_protocol = pai->ai_protocol;
1142 *res = sentinel.ai_next;
1146 freeaddrinfo(sentinel.ai_next);
1152 * passive socket -> anyaddr (0.0.0.0 or ::)
1153 * non-passive socket -> localhost (127.0.0.1 or ::1)
1156 explore_null(const struct addrinfo *pai, const char *servname,
1157 struct addrinfo **res)
1160 const struct afd *afd;
1161 struct addrinfo *ai;
1168 * filter out AFs that are not supported by the kernel
1171 s = _socket(pai->ai_family, SOCK_DGRAM, 0);
1173 if (errno != EMFILE)
1178 afd = find_afd(pai->ai_family);
1182 if (pai->ai_flags & AI_PASSIVE) {
1183 GET_AI(ai, afd, afd->a_addrany);
1184 GET_PORT(ai, servname);
1186 GET_AI(ai, afd, afd->a_loopback);
1187 GET_PORT(ai, servname);
1203 explore_numeric(const struct addrinfo *pai, const char *hostname,
1204 const char *servname, struct addrinfo **res, const char *canonname)
1206 const struct afd *afd;
1207 struct addrinfo *ai, ai0;
1209 char pton[PTON_MAX];
1214 afd = find_afd(pai->ai_family);
1218 switch (afd->a_af) {
1221 * RFC3493 requires getaddrinfo() to accept AF_INET formats
1222 * that are accepted by inet_addr() and its family. The
1223 * accepted forms includes the "classful" one, which inet_pton
1224 * does not accept. So we need to separate the case for
1227 if (inet_aton(hostname, (struct in_addr *)pton) != 1)
1231 if (inet_pton(afd->a_af, hostname, pton) != 1) {
1232 if (pai->ai_family != AF_INET6 ||
1233 (pai->ai_flags & AI_V4MAPPED) != AI_V4MAPPED)
1235 if (inet_aton(hostname, (struct in_addr *)pton) != 1)
1237 afd = &afdl[N_INET];
1239 ai0.ai_family = AF_INET;
1245 if (pai->ai_family == afd->a_af) {
1246 GET_AI(ai, afd, pton);
1247 GET_PORT(ai, servname);
1248 if ((pai->ai_flags & AI_CANONNAME)) {
1250 * Set the numeric address itself as the canonical
1251 * name, based on a clarification in RFC3493.
1253 GET_CANONNAME(ai, canonname);
1257 * XXX: This should not happen since we already matched the AF
1274 * numeric hostname with scope
1277 explore_numeric_scope(const struct addrinfo *pai, const char *hostname,
1278 const char *servname, struct addrinfo **res)
1280 #if !defined(SCOPE_DELIMITER) || !defined(INET6)
1281 return explore_numeric(pai, hostname, servname, res, hostname);
1283 const struct afd *afd;
1284 struct addrinfo *cur;
1286 char *cp, *hostname2 = NULL, *scope, *addr;
1287 struct sockaddr_in6 *sin6;
1289 afd = find_afd(pai->ai_family);
1294 return explore_numeric(pai, hostname, servname, res, hostname);
1296 cp = strchr(hostname, SCOPE_DELIMITER);
1298 return explore_numeric(pai, hostname, servname, res, hostname);
1301 * Handle special case of <scoped_address><delimiter><scope id>
1303 hostname2 = strdup(hostname);
1304 if (hostname2 == NULL)
1306 /* terminate at the delimiter */
1307 hostname2[cp - hostname] = '\0';
1311 error = explore_numeric(pai, addr, servname, res, hostname);
1315 for (cur = *res; cur; cur = cur->ai_next) {
1316 if (cur->ai_family != AF_INET6)
1318 sin6 = (struct sockaddr_in6 *)(void *)cur->ai_addr;
1319 if (ip6_str2scopeid(scope, sin6, &scopeid) == -1) {
1323 return(EAI_NONAME); /* XXX: is return OK? */
1325 sin6->sin6_scope_id = scopeid;
1331 if (error && *res) {
1340 get_canonname(const struct addrinfo *pai, struct addrinfo *ai, const char *str)
1342 if ((pai->ai_flags & AI_CANONNAME) != 0) {
1343 ai->ai_canonname = strdup(str);
1344 if (ai->ai_canonname == NULL)
1350 static struct addrinfo *
1351 get_ai(const struct addrinfo *pai, const struct afd *afd, const char *addr)
1354 struct addrinfo *ai;
1356 struct in6_addr faith_prefix;
1361 struct in6_addr mapaddr;
1366 * Transfrom an IPv4 addr into a special IPv6 addr format for
1367 * IPv6->IPv4 translation gateway. (only TCP is supported now)
1369 * +-----------------------------------+------------+
1370 * | faith prefix part (12 bytes) | embedded |
1371 * | | IPv4 addr part (4 bytes)
1372 * +-----------------------------------+------------+
1374 * faith prefix part is specified as ascii IPv6 addr format
1375 * in environmental variable GAI.
1376 * For FAITH to work correctly, routing to faith prefix must be
1377 * setup toward a machine where a FAITH daemon operates.
1378 * Also, the machine must enable some mechanizm
1379 * (e.g. faith interface hack) to divert those packet with
1380 * faith prefixed destination addr to user-land FAITH daemon.
1382 fp_str = getenv("GAI");
1383 if (fp_str && inet_pton(AF_INET6, fp_str, &faith_prefix) == 1 &&
1384 afd->a_af == AF_INET && pai->ai_socktype == SOCK_STREAM) {
1388 memcpy(&v4a, addr, sizeof v4a);
1389 v4a_top = v4a >> IN_CLASSA_NSHIFT;
1390 if (!IN_MULTICAST(v4a) && !IN_EXPERIMENTAL(v4a) &&
1391 v4a_top != 0 && v4a != IN_LOOPBACKNET) {
1392 afd = &afdl[N_INET6];
1393 memcpy(&faith_prefix.s6_addr[12], addr,
1394 sizeof(struct in_addr));
1401 if (afd->a_af == AF_INET && (pai->ai_flags & AI_V4MAPPED) != 0) {
1402 afd = &afdl[N_INET6];
1403 _map_v4v6_address(addr, (char *)&mapaddr);
1404 addr = (char *)&mapaddr;
1408 ai = (struct addrinfo *)malloc(sizeof(struct addrinfo)
1409 + (afd->a_socklen));
1413 memcpy(ai, pai, sizeof(struct addrinfo));
1414 ai->ai_addr = (struct sockaddr *)(void *)(ai + 1);
1415 memset(ai->ai_addr, 0, (size_t)afd->a_socklen);
1416 ai->ai_addr->sa_len = afd->a_socklen;
1417 ai->ai_addrlen = afd->a_socklen;
1418 ai->ai_addr->sa_family = ai->ai_family = afd->a_af;
1419 p = (char *)(void *)(ai->ai_addr);
1422 memcpy(p + afd->a_off, &faith_prefix, (size_t)afd->a_addrlen);
1425 memcpy(p + afd->a_off, addr, (size_t)afd->a_addrlen);
1429 /* XXX need to malloc() the same way we do from other functions! */
1430 static struct addrinfo *
1431 copy_ai(const struct addrinfo *pai)
1433 struct addrinfo *ai;
1436 l = sizeof(*ai) + pai->ai_addrlen;
1437 if ((ai = (struct addrinfo *)malloc(l)) == NULL)
1440 memcpy(ai, pai, sizeof(*ai));
1441 ai->ai_addr = (struct sockaddr *)(void *)(ai + 1);
1442 memcpy(ai->ai_addr, pai->ai_addr, pai->ai_addrlen);
1444 if (pai->ai_canonname) {
1445 l = strlen(pai->ai_canonname) + 1;
1446 if ((ai->ai_canonname = malloc(l)) == NULL) {
1450 strlcpy(ai->ai_canonname, pai->ai_canonname, l);
1452 /* just to make sure */
1453 ai->ai_canonname = NULL;
1462 get_portmatch(const struct addrinfo *ai, const char *servname)
1465 /* get_port does not touch first argument when matchonly == 1. */
1466 /* LINTED const cast */
1467 return get_port((struct addrinfo *)ai, servname, 1);
1471 get_port(struct addrinfo *ai, const char *servname, int matchonly)
1478 if (servname == NULL)
1480 switch (ai->ai_family) {
1490 switch (ai->ai_socktype) {
1495 case SOCK_SEQPACKET:
1499 switch (ai->ai_family) {
1512 return EAI_SOCKTYPE;
1515 error = str2number(servname, &port);
1519 if (port < 0 || port > 65535)
1523 if (ai->ai_flags & AI_NUMERICSERV)
1526 switch (ai->ai_protocol) {
1541 if ((sp = getservbyname(servname, proto)) == NULL)
1547 switch (ai->ai_family) {
1549 ((struct sockaddr_in *)(void *)
1550 ai->ai_addr)->sin_port = port;
1554 ((struct sockaddr_in6 *)(void *)
1555 ai->ai_addr)->sin6_port = port;
1564 static const struct afd *
1567 const struct afd *afd;
1569 if (af == PF_UNSPEC)
1571 for (afd = afdl; afd->a_af; afd++) {
1572 if (afd->a_af == af)
1579 * RFC 3493: AI_ADDRCONFIG check. Determines which address families are
1580 * configured on the local system and correlates with pai->ai_family value.
1581 * If an address family is not configured on the system, it will not be
1582 * queried for. For this purpose, loopback addresses are not considered
1583 * configured addresses.
1585 * XXX PF_UNSPEC -> PF_INET6 + PF_INET mapping needs to be in sync with
1589 addrconfig(struct addrinfo *pai)
1591 struct ifaddrs *ifaddrs, *ifa;
1592 struct sockaddr_in *sin;
1594 struct sockaddr_in6 *sin6;
1596 int seen_inet = 0, seen_inet6 = 0;
1598 if (getifaddrs(&ifaddrs) != 0)
1601 for (ifa = ifaddrs; ifa != NULL; ifa = ifa->ifa_next) {
1602 if (ifa->ifa_addr == NULL || (ifa->ifa_flags & IFF_UP) == 0)
1604 switch (ifa->ifa_addr->sa_family) {
1608 sin = (struct sockaddr_in *)(ifa->ifa_addr);
1609 if (htonl(sin->sin_addr.s_addr) == INADDR_LOOPBACK)
1617 sin6 = (struct sockaddr_in6 *)(ifa->ifa_addr);
1618 if (IN6_IS_ADDR_LOOPBACK(&sin6->sin6_addr))
1620 if ((ifa->ifa_flags & IFT_LOOP) != 0 &&
1621 IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr))
1623 if (is_ifdisabled(ifa->ifa_name))
1630 freeifaddrs(ifaddrs);
1632 switch(pai->ai_family) {
1634 return (seen_inet6);
1638 if (seen_inet == seen_inet6)
1640 pai->ai_family = seen_inet ? AF_INET : AF_INET6;
1648 is_ifdisabled(char *name)
1650 struct in6_ndireq nd;
1653 if ((fd = _socket(AF_INET6, SOCK_DGRAM, 0)) < 0)
1655 memset(&nd, 0, sizeof(nd));
1656 strlcpy(nd.ifname, name, sizeof(nd.ifname));
1657 if (_ioctl(fd, SIOCGIFINFO_IN6, &nd) < 0) {
1662 return ((nd.ndi.flags & ND6_IFF_IFDISABLED) != 0);
1665 /* convert a string to a scope identifier. XXX: IPv6 specific */
1667 ip6_str2scopeid(char *scope, struct sockaddr_in6 *sin6, u_int32_t *scopeid)
1670 struct in6_addr *a6;
1673 a6 = &sin6->sin6_addr;
1675 /* empty scopeid portion is invalid */
1679 if (IN6_IS_ADDR_LINKLOCAL(a6) || IN6_IS_ADDR_MC_LINKLOCAL(a6) ||
1680 IN6_IS_ADDR_MC_NODELOCAL(a6)) {
1682 * We currently assume a one-to-one mapping between links
1683 * and interfaces, so we simply use interface indices for
1684 * like-local scopes.
1686 *scopeid = if_nametoindex(scope);
1692 /* still unclear about literal, allow numeric only - placeholder */
1693 if (IN6_IS_ADDR_SITELOCAL(a6) || IN6_IS_ADDR_MC_SITELOCAL(a6))
1695 if (IN6_IS_ADDR_MC_ORGLOCAL(a6))
1698 goto trynumeric; /* global */
1700 /* try to convert to a numeric id as a last resort */
1703 lscopeid = strtoul(scope, &ep, 10);
1704 *scopeid = (u_int32_t)(lscopeid & 0xffffffffUL);
1705 if (errno == 0 && ep && *ep == '\0' && *scopeid == lscopeid)
1715 addrinfo_id_func(char *buffer, size_t *buffer_size, va_list ap,
1721 const int op_id = 0; /* identifies the getaddrinfo for the cache */
1723 struct addrinfo *hints;
1726 int ai_flags, ai_family, ai_socktype, ai_protocol;
1727 size_t desired_size, size;
1729 statp = __res_state();
1730 res_options = statp->options & (RES_RECURSE | RES_DEFNAMES |
1731 RES_DNSRCH | RES_NOALIASES | RES_USE_INET6);
1733 hostname = va_arg(ap, char *);
1734 hints = va_arg(ap, struct addrinfo *);
1736 desired_size = sizeof(res_options) + sizeof(int) + sizeof(int) * 4;
1737 if (hostname != NULL) {
1738 size = strlen(hostname);
1739 desired_size += size + 1;
1743 if (desired_size > *buffer_size) {
1744 *buffer_size = desired_size;
1749 ai_flags = ai_family = ai_socktype = ai_protocol = 0;
1751 ai_flags = hints->ai_flags;
1752 ai_family = hints->ai_family;
1753 ai_socktype = hints->ai_socktype;
1754 ai_protocol = hints->ai_protocol;
1758 memcpy(p, &res_options, sizeof(res_options));
1759 p += sizeof(res_options);
1761 memcpy(p, &op_id, sizeof(int));
1764 memcpy(p, &ai_flags, sizeof(int));
1767 memcpy(p, &ai_family, sizeof(int));
1770 memcpy(p, &ai_socktype, sizeof(int));
1773 memcpy(p, &ai_protocol, sizeof(int));
1776 if (hostname != NULL)
1777 memcpy(p, hostname, size);
1779 *buffer_size = desired_size;
1780 return (NS_SUCCESS);
1784 addrinfo_marshal_func(char *buffer, size_t *buffer_size, void *retval,
1785 va_list ap, void *cache_mdata)
1787 struct addrinfo *ai, *cai;
1789 size_t desired_size, size, ai_size;
1791 ai = *((struct addrinfo **)retval);
1793 desired_size = sizeof(size_t);
1795 for (cai = ai; cai != NULL; cai = cai->ai_next) {
1796 desired_size += sizeof(struct addrinfo) + cai->ai_addrlen;
1797 if (cai->ai_canonname != NULL)
1798 desired_size += sizeof(size_t) +
1799 strlen(cai->ai_canonname);
1803 if (desired_size > *buffer_size) {
1804 /* this assignment is here for future use */
1806 *buffer_size = desired_size;
1810 memset(buffer, 0, desired_size);
1813 memcpy(p, &ai_size, sizeof(size_t));
1814 p += sizeof(size_t);
1815 for (cai = ai; cai != NULL; cai = cai->ai_next) {
1816 memcpy(p, cai, sizeof(struct addrinfo));
1817 p += sizeof(struct addrinfo);
1819 memcpy(p, cai->ai_addr, cai->ai_addrlen);
1820 p += cai->ai_addrlen;
1822 if (cai->ai_canonname != NULL) {
1823 size = strlen(cai->ai_canonname);
1824 memcpy(p, &size, sizeof(size_t));
1825 p += sizeof(size_t);
1827 memcpy(p, cai->ai_canonname, size);
1832 return (NS_SUCCESS);
1836 addrinfo_unmarshal_func(char *buffer, size_t buffer_size, void *retval,
1837 va_list ap, void *cache_mdata)
1839 struct addrinfo new_ai, *result, *sentinel, *lasts;
1842 size_t ai_size, ai_i, size;
1845 memcpy(&ai_size, p, sizeof(size_t));
1846 p += sizeof(size_t);
1850 for (ai_i = 0; ai_i < ai_size; ++ai_i) {
1851 memcpy(&new_ai, p, sizeof(struct addrinfo));
1852 p += sizeof(struct addrinfo);
1853 size = new_ai.ai_addrlen + sizeof(struct addrinfo) +
1856 sentinel = (struct addrinfo *)malloc(size);
1857 memset(sentinel, 0, size);
1859 memcpy(sentinel, &new_ai, sizeof(struct addrinfo));
1860 sentinel->ai_addr = (struct sockaddr *)_ALIGN((char *)sentinel +
1861 sizeof(struct addrinfo));
1863 memcpy(sentinel->ai_addr, p, new_ai.ai_addrlen);
1864 p += new_ai.ai_addrlen;
1866 if (new_ai.ai_canonname != NULL) {
1867 memcpy(&size, p, sizeof(size_t));
1868 p += sizeof(size_t);
1870 sentinel->ai_canonname = (char *)malloc(size + 1);
1871 memset(sentinel->ai_canonname, 0, size + 1);
1873 memcpy(sentinel->ai_canonname, p, size);
1877 if (result == NULL) {
1881 lasts->ai_next = sentinel;
1886 *((struct addrinfo **)retval) = result;
1887 return (NS_SUCCESS);
1889 #endif /* NS_CACHING */
1892 * FQDN hostname, DNS lookup
1895 explore_fqdn(const struct addrinfo *pai, const char *hostname,
1896 const char *servname, struct addrinfo **res)
1898 struct addrinfo *result;
1899 struct addrinfo *cur;
1903 static const nss_cache_info cache_info =
1904 NS_COMMON_CACHE_INFO_INITIALIZER(
1905 hosts, NULL, addrinfo_id_func, addrinfo_marshal_func,
1906 addrinfo_unmarshal_func);
1908 static const ns_dtab dtab[] = {
1909 NS_FILES_CB(_files_getaddrinfo, NULL)
1910 { NSSRC_DNS, _dns_getaddrinfo, NULL }, /* force -DHESIOD */
1911 NS_NIS_CB(_yp_getaddrinfo, NULL)
1913 NS_CACHE_CB(&cache_info)
1921 * if the servname does not match socktype/protocol, ignore it.
1923 if (get_portmatch(pai, servname) != 0)
1926 switch (_nsdispatch(&result, dtab, NSDB_HOSTS, "getaddrinfo",
1927 default_dns_files, hostname, pai)) {
1939 for (cur = result; cur; cur = cur->ai_next) {
1940 GET_PORT(cur, servname);
1941 /* canonname should be filled already */
1952 freeaddrinfo(result);
1957 static const char AskedForGot[] =
1958 "gethostby*.getanswer: asked for \"%s\", got \"%s\"";
1961 static struct addrinfo *
1962 getanswer(const querybuf *answer, int anslen, const char *qname, int qtype,
1963 const struct addrinfo *pai, res_state res)
1965 struct addrinfo sentinel, *cur;
1967 const struct afd *afd;
1974 int type, class, ancount, qdcount;
1975 int haveanswer, had_error;
1976 char tbuf[MAXDNAME];
1977 int (*name_ok)(const char *);
1978 char hostbuf[8*1024];
1980 memset(&sentinel, 0, sizeof(sentinel));
1984 eom = answer->buf + anslen;
1988 case T_ANY: /*use T_ANY only for T_A/T_AAAA lookup*/
1992 return (NULL); /* XXX should be abort(); */
1995 * find first satisfactory answer
1998 ancount = ntohs(hp->ancount);
1999 qdcount = ntohs(hp->qdcount);
2001 ep = hostbuf + sizeof hostbuf;
2002 cp = answer->buf + HFIXEDSZ;
2004 RES_SET_H_ERRNO(res, NO_RECOVERY);
2007 n = dn_expand(answer->buf, eom, cp, bp, ep - bp);
2008 if ((n < 0) || !(*name_ok)(bp)) {
2009 RES_SET_H_ERRNO(res, NO_RECOVERY);
2013 if (qtype == T_A || qtype == T_AAAA || qtype == T_ANY) {
2014 /* res_send() has already verified that the query name is the
2015 * same as the one we sent; this just gets the expanded name
2016 * (i.e., with the succeeding search-domain tacked on).
2018 n = strlen(bp) + 1; /* for the \0 */
2019 if (n >= MAXHOSTNAMELEN) {
2020 RES_SET_H_ERRNO(res, NO_RECOVERY);
2025 /* The qname can be abbreviated, but h_name is now absolute. */
2030 while (ancount-- > 0 && cp < eom && !had_error) {
2031 n = dn_expand(answer->buf, eom, cp, bp, ep - bp);
2032 if ((n < 0) || !(*name_ok)(bp)) {
2037 type = _getshort(cp);
2038 cp += INT16SZ; /* type */
2039 class = _getshort(cp);
2040 cp += INT16SZ + INT32SZ; /* class, TTL */
2042 cp += INT16SZ; /* len */
2043 if (class != C_IN) {
2044 /* XXX - debug? syslog? */
2046 continue; /* XXX - had_error++ ? */
2048 if ((qtype == T_A || qtype == T_AAAA || qtype == T_ANY) &&
2050 n = dn_expand(answer->buf, eom, cp, tbuf, sizeof tbuf);
2051 if ((n < 0) || !(*name_ok)(tbuf)) {
2056 /* Get canonical name. */
2057 n = strlen(tbuf) + 1; /* for the \0 */
2058 if (n > ep - bp || n >= MAXHOSTNAMELEN) {
2062 strlcpy(bp, tbuf, ep - bp);
2067 if (qtype == T_ANY) {
2068 if (!(type == T_A || type == T_AAAA)) {
2072 } else if (type != qtype) {
2074 if (type != T_KEY && type != T_SIG &&
2076 syslog(LOG_NOTICE|LOG_AUTH,
2077 "gethostby*.getanswer: asked for \"%s %s %s\", got type \"%s\"",
2078 qname, p_class(C_IN), p_type(qtype),
2082 continue; /* XXX - had_error++ ? */
2087 if (strcasecmp(canonname, bp) != 0) {
2089 syslog(LOG_NOTICE|LOG_AUTH,
2090 AskedForGot, canonname, bp);
2093 continue; /* XXX - had_error++ ? */
2095 if (type == T_A && n != INADDRSZ) {
2099 if (type == T_AAAA && n != IN6ADDRSZ) {
2103 #ifdef FILTER_V4MAPPED
2104 if (type == T_AAAA) {
2105 struct in6_addr in6;
2106 memcpy(&in6, cp, sizeof(in6));
2107 if (IN6_IS_ADDR_V4MAPPED(&in6)) {
2117 nn = strlen(bp) + 1; /* for the \0 */
2121 /* don't overwrite pai */
2123 ai.ai_family = (type == T_A) ? AF_INET : AF_INET6;
2124 afd = find_afd(ai.ai_family);
2129 cur->ai_next = get_ai(&ai, afd, (const char *)cp);
2130 if (cur->ai_next == NULL)
2132 while (cur && cur->ai_next)
2143 #if defined(RESOLVSORT)
2145 * We support only IPv4 address for backward
2146 * compatibility against gethostbyname(3).
2148 if (res->nsort && qtype == T_A) {
2149 if (addr4sort(&sentinel, res) < 0) {
2150 freeaddrinfo(sentinel.ai_next);
2151 RES_SET_H_ERRNO(res, NO_RECOVERY);
2155 #endif /*RESOLVSORT*/
2157 (void)get_canonname(pai, sentinel.ai_next, qname);
2159 (void)get_canonname(pai, sentinel.ai_next, canonname);
2160 RES_SET_H_ERRNO(res, NETDB_SUCCESS);
2161 return sentinel.ai_next;
2164 RES_SET_H_ERRNO(res, NO_RECOVERY);
2170 struct addrinfo *ai;
2175 addr4sort(struct addrinfo *sentinel, res_state res)
2177 struct addrinfo *ai;
2178 struct addr_ptr *addrs, addr;
2179 struct sockaddr_in *sin;
2186 for (ai = sentinel->ai_next; ai; ai = ai->ai_next)
2189 return 0; /* We don't need sorting. */
2190 if ((addrs = malloc(sizeof(struct addr_ptr) * naddrs)) == NULL)
2193 for (ai = sentinel->ai_next; ai; ai = ai->ai_next) {
2194 sin = (struct sockaddr_in *)ai->ai_addr;
2195 for (j = 0; (unsigned)j < res->nsort; j++) {
2196 if (res->sort_list[j].addr.s_addr ==
2197 (sin->sin_addr.s_addr & res->sort_list[j].mask))
2202 if (needsort == 0 && i > 0 && j < addrs[i - 1].aval)
2211 while (needsort < naddrs) {
2212 for (j = needsort - 1; j >= 0; j--) {
2213 if (addrs[j].aval > addrs[j+1].aval) {
2215 addrs[j] = addrs[j + 1];
2216 addrs[j + 1] = addr;
2224 for (i = 0; i < naddrs; ++i) {
2225 ai->ai_next = addrs[i].ai;
2232 #endif /*RESOLVSORT*/
2236 _dns_getaddrinfo(void *rv, void *cb_data, va_list ap)
2238 struct addrinfo *ai, ai0;
2239 querybuf *buf, *buf2;
2240 const char *hostname;
2241 const struct addrinfo *pai;
2242 struct addrinfo sentinel, *cur;
2243 struct res_target q, q2;
2246 hostname = va_arg(ap, char *);
2247 pai = va_arg(ap, const struct addrinfo *);
2249 memset(&q, 0, sizeof(q));
2250 memset(&q2, 0, sizeof(q2));
2251 memset(&sentinel, 0, sizeof(sentinel));
2254 res = __res_state();
2256 buf = malloc(sizeof(*buf));
2258 RES_SET_H_ERRNO(res, NETDB_INTERNAL);
2261 buf2 = malloc(sizeof(*buf2));
2264 RES_SET_H_ERRNO(res, NETDB_INTERNAL);
2268 if (pai->ai_family == AF_INET6 &&
2269 (pai->ai_flags & AI_V4MAPPED) == AI_V4MAPPED) {
2271 ai0.ai_family = AF_UNSPEC;
2275 switch (pai->ai_family) {
2280 q.answer = buf->buf;
2281 q.anslen = sizeof(buf->buf);
2286 q2.answer = buf2->buf;
2287 q2.anslen = sizeof(buf2->buf);
2293 q.answer = buf->buf;
2294 q.anslen = sizeof(buf->buf);
2300 q.answer = buf->buf;
2301 q.anslen = sizeof(buf->buf);
2309 if ((res->options & RES_INIT) == 0 && res_ninit(res) == -1) {
2310 RES_SET_H_ERRNO(res, NETDB_INTERNAL);
2316 if (res_searchN(hostname, &q, res) < 0) {
2323 ai = getanswer(buf2, q2.n, q2.name, q2.qtype, pai, res);
2326 while (cur && cur->ai_next)
2330 if (!ai || pai->ai_family != AF_UNSPEC ||
2331 (pai->ai_flags & (AI_ALL | AI_V4MAPPED)) != AI_V4MAPPED) {
2332 ai = getanswer(buf, q.n, q.name, q.qtype, pai, res);
2338 if (sentinel.ai_next == NULL)
2339 switch (res->res_h_errno) {
2340 case HOST_NOT_FOUND:
2347 *((struct addrinfo **)rv) = sentinel.ai_next;
2352 _sethtent(FILE **hostf)
2355 *hostf = fopen(_PATH_HOSTS, "r");
2361 _endhtent(FILE **hostf)
2364 (void) fclose(*hostf);
2369 static struct addrinfo *
2370 _gethtent(FILE **hostf, const char *name, const struct addrinfo *pai)
2373 char *cp, *tname, *cname;
2374 struct addrinfo hints, *res0, *res;
2377 char hostbuf[8*1024];
2379 if (!*hostf && !(*hostf = fopen(_PATH_HOSTS, "r")))
2382 if (!(p = fgets(hostbuf, sizeof hostbuf, *hostf)))
2386 cp = strpbrk(p, "#\n");
2389 if (!(cp = strpbrk(p, " \t")))
2394 /* if this is not something we're looking for, skip it. */
2396 if (*cp == ' ' || *cp == '\t') {
2403 if ((cp = strpbrk(cp, " \t")) != NULL)
2405 if (strcasecmp(name, tname) == 0)
2411 /* we should not glob socktype/protocol here */
2412 memset(&hints, 0, sizeof(hints));
2413 hints.ai_family = pai->ai_family;
2414 hints.ai_socktype = SOCK_DGRAM;
2415 hints.ai_protocol = 0;
2416 hints.ai_flags = AI_NUMERICHOST;
2417 if (pai->ai_family == AF_INET6 &&
2418 (pai->ai_flags & AI_V4MAPPED) == AI_V4MAPPED)
2419 hints.ai_flags |= AI_V4MAPPED;
2420 error = getaddrinfo(addr, "0", &hints, &res0);
2423 #ifdef FILTER_V4MAPPED
2424 /* XXX should check all items in the chain */
2425 if (res0->ai_family == AF_INET6 &&
2426 IN6_IS_ADDR_V4MAPPED(&((struct sockaddr_in6 *)res0->ai_addr)->sin6_addr)) {
2431 for (res = res0; res; res = res->ai_next) {
2433 res->ai_flags = pai->ai_flags;
2434 res->ai_socktype = pai->ai_socktype;
2435 res->ai_protocol = pai->ai_protocol;
2437 if (pai->ai_flags & AI_CANONNAME) {
2438 if (get_canonname(pai, res, cname) != 0) {
2447 static struct addrinfo *
2448 _getht(FILE **hostf, const char *name, const struct addrinfo *pai,
2449 struct addrinfo *cur)
2453 while ((p = _gethtent(hostf, name, pai)) != NULL) {
2455 while (cur && cur->ai_next)
2463 _files_getaddrinfo(void *rv, void *cb_data, va_list ap)
2466 const struct addrinfo *pai;
2467 struct addrinfo sentinel, *cur;
2470 name = va_arg(ap, char *);
2471 pai = va_arg(ap, struct addrinfo *);
2473 memset(&sentinel, 0, sizeof(sentinel));
2477 if (pai->ai_family == AF_INET6 &&
2478 (pai->ai_flags & (AI_ALL | AI_V4MAPPED)) == AI_V4MAPPED) {
2479 struct addrinfo ai0 = *pai;
2481 ai0.ai_flags &= ~AI_V4MAPPED;
2482 cur = _getht(&hostf, name, &ai0, cur);
2483 if (sentinel.ai_next == NULL) {
2485 ai0.ai_flags |= AI_V4MAPPED;
2486 cur = _getht(&hostf, name, &ai0, cur);
2489 cur = _getht(&hostf, name, pai, cur);
2492 *((struct addrinfo **)rv) = sentinel.ai_next;
2493 if (sentinel.ai_next == NULL)
2500 static struct addrinfo *
2501 _yphostent(char *line, const struct addrinfo *pai)
2503 struct addrinfo sentinel, *cur;
2504 struct addrinfo hints, *res, *res0;
2507 const char *addr, *canonname;
2511 addr = canonname = NULL;
2513 memset(&sentinel, 0, sizeof(sentinel));
2517 /* terminate line */
2518 cp = strchr(p, '\n');
2525 cp = strpbrk(p, " \t");
2527 if (canonname == NULL)
2537 if (*cp == ' ' || *cp == '\t') {
2543 if ((cp = strpbrk(cp, " \t")) != NULL)
2548 hints.ai_flags = AI_NUMERICHOST;
2549 if (pai->ai_family == AF_INET6 &&
2550 (pai->ai_flags & AI_V4MAPPED) == AI_V4MAPPED)
2551 hints.ai_flags |= AI_V4MAPPED;
2552 error = getaddrinfo(addr, NULL, &hints, &res0);
2554 for (res = res0; res; res = res->ai_next) {
2556 res->ai_flags = pai->ai_flags;
2558 if (pai->ai_flags & AI_CANONNAME)
2559 (void)get_canonname(pai, res, canonname);
2564 cur->ai_next = res0;
2565 while (cur && cur->ai_next)
2575 return sentinel.ai_next;
2580 _yp_getaddrinfo(void *rv, void *cb_data, va_list ap)
2582 struct addrinfo sentinel, *cur;
2583 struct addrinfo *ai = NULL;
2587 const struct addrinfo *pai;
2590 if (_yp_check(&ypdomain) == 0)
2593 name = va_arg(ap, char *);
2594 pai = va_arg(ap, const struct addrinfo *);
2596 memset(&sentinel, 0, sizeof(sentinel));
2599 /* ipnodes.byname can hold both IPv4/v6 */
2600 r = yp_match(ypdomain, "ipnodes.byname", name,
2601 (int)strlen(name), &ypbuf, &ypbuflen);
2603 ai = _yphostent(ypbuf, pai);
2606 while (cur && cur->ai_next)
2613 struct sockaddr_in6 *sin6;
2615 switch (ai->ai_family) {
2619 sin6 = (struct sockaddr_in6 *)ai->ai_addr;
2620 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr))
2626 /* hosts.byname is only for IPv4 (Solaris8) */
2627 if (pai->ai_family == AF_UNSPEC || pai->ai_family == AF_INET ||
2628 ((pai->ai_family == AF_INET6 &&
2629 (pai->ai_flags & AI_V4MAPPED) == AI_V4MAPPED) &&
2630 (ai == NULL || (pai->ai_flags & AI_ALL) == AI_ALL))) {
2631 r = yp_match(ypdomain, "hosts.byname", name,
2632 (int)strlen(name), &ypbuf, &ypbuflen);
2634 struct addrinfo ai4;
2637 if (pai->ai_family == AF_UNSPEC)
2638 ai4.ai_family = AF_INET;
2639 ai = _yphostent(ypbuf, &ai4);
2642 while (cur && cur->ai_next)
2650 if (sentinel.ai_next == NULL) {
2651 RES_SET_H_ERRNO(__res_state(), HOST_NOT_FOUND);
2654 *((struct addrinfo **)rv) = sentinel.ai_next;
2659 /* resolver logic */
2662 * Formulate a normal query, send, and await answer.
2663 * Returned answer is placed in supplied buffer "answer".
2664 * Perform preliminary check of answer, returning success only
2665 * if no error is indicated and the answer count is nonzero.
2666 * Return the size of the response on success, -1 on error.
2667 * Error number is left in h_errno.
2669 * Caller must parse answer and determine whether it answers the question.
2672 res_queryN(const char *name, struct res_target *target, res_state res)
2678 struct res_target *t;
2685 buf = malloc(MAXPACKET);
2687 RES_SET_H_ERRNO(res, NETDB_INTERNAL);
2691 for (t = target; t; t = t->next) {
2696 hp = (HEADER *)(void *)t->answer;
2698 /* make it easier... */
2704 oflags = res->_flags;
2707 hp->rcode = NOERROR; /* default */
2710 if (res->options & RES_DEBUG)
2711 printf(";; res_query(%s, %d, %d)\n", name, class, type);
2714 n = res_nmkquery(res, QUERY, name, class, type, NULL, 0, NULL,
2716 if (n > 0 && (res->_flags & RES_F_EDNS0ERR) == 0 &&
2717 (res->options & (RES_USE_EDNS0|RES_USE_DNSSEC)) != 0U)
2718 n = res_nopt(res, n, buf, MAXPACKET, anslen);
2721 if (res->options & RES_DEBUG)
2722 printf(";; res_query: mkquery failed\n");
2725 RES_SET_H_ERRNO(res, NO_RECOVERY);
2728 n = res_nsend(res, buf, n, answer, anslen);
2731 * if the query choked with EDNS0, retry
2734 if ((res->options & (RES_USE_EDNS0|RES_USE_DNSSEC))
2736 ((oflags ^ res->_flags) & RES_F_EDNS0ERR) != 0) {
2737 res->_flags |= RES_F_EDNS0ERR;
2738 if (res->options & RES_DEBUG)
2739 printf(";; res_nquery: retry without EDNS0\n");
2742 rcode = hp->rcode; /* record most recent error */
2744 if (res->options & RES_DEBUG)
2745 printf(";; res_query: send error\n");
2751 hp->rcode = FORMERR; /* XXX not very informative */
2752 if (hp->rcode != NOERROR || ntohs(hp->ancount) == 0) {
2753 rcode = hp->rcode; /* record most recent error */
2755 if (res->options & RES_DEBUG)
2756 printf(";; rcode = %u, ancount=%u\n", hp->rcode,
2757 ntohs(hp->ancount));
2762 ancount += ntohs(hp->ancount);
2772 RES_SET_H_ERRNO(res, HOST_NOT_FOUND);
2775 RES_SET_H_ERRNO(res, TRY_AGAIN);
2778 RES_SET_H_ERRNO(res, NO_DATA);
2784 RES_SET_H_ERRNO(res, NO_RECOVERY);
2793 * Formulate a normal query, send, and retrieve answer in supplied buffer.
2794 * Return the size of the response on success, -1 on error.
2795 * If enabled, implement search rules until answer or unrecoverable failure
2796 * is detected. Error code, if any, is left in h_errno.
2799 res_searchN(const char *name, struct res_target *target, res_state res)
2801 const char *cp, * const *domain;
2802 HEADER *hp = (HEADER *)(void *)target->answer; /*XXX*/
2804 int trailing_dot, ret, saved_herrno;
2805 int got_nodata = 0, got_servfail = 0, root_on_list = 0;
2806 int tried_as_is = 0;
2808 char abuf[MAXDNAME];
2811 RES_SET_H_ERRNO(res, HOST_NOT_FOUND); /* default, if we never query */
2813 for (cp = name; *cp; cp++)
2814 dots += (*cp == '.');
2816 if (cp > name && *--cp == '.')
2820 * if there aren't any dots, it could be a user-level alias
2823 (cp = res_hostalias(res, name, abuf, sizeof(abuf))) != NULL)
2824 return (res_queryN(cp, target, res));
2827 * If there are enough dots in the name, let's just give it a
2828 * try 'as is'. The threshold can be set with the "ndots" option.
2829 * Also, query 'as is', if there is a trailing dot in the name.
2832 if (dots >= res->ndots || trailing_dot) {
2833 ret = res_querydomainN(name, NULL, target, res);
2834 if (ret > 0 || trailing_dot)
2836 if (errno == ECONNREFUSED) {
2837 RES_SET_H_ERRNO(res, TRY_AGAIN);
2840 switch (res->res_h_errno) {
2842 case HOST_NOT_FOUND:
2845 if (hp->rcode == SERVFAIL)
2851 saved_herrno = res->res_h_errno;
2856 * We do at least one level of search if
2857 * - there is no dot and RES_DEFNAME is set, or
2858 * - there is at least one dot, there is no trailing dot,
2859 * and RES_DNSRCH is set.
2861 if ((!dots && (res->options & RES_DEFNAMES)) ||
2862 (dots && !trailing_dot && (res->options & RES_DNSRCH))) {
2865 for (domain = (const char * const *)res->dnsrch;
2870 if (domain[0][0] == '\0' ||
2871 (domain[0][0] == '.' && domain[0][1] == '\0'))
2874 if (root_on_list && tried_as_is)
2877 ret = res_querydomainN(name, *domain, target, res);
2882 * If no server present, give up.
2883 * If name isn't found in this domain,
2884 * keep trying higher domains in the search list
2885 * (if that's enabled).
2886 * On a NO_DATA error, keep trying, otherwise
2887 * a wildcard entry of another type could keep us
2888 * from finding this entry higher in the domain.
2889 * If we get some other error (negative answer or
2890 * server failure), then stop searching up,
2891 * but try the input name below in case it's
2894 if (errno == ECONNREFUSED) {
2895 RES_SET_H_ERRNO(res, TRY_AGAIN);
2899 switch (res->res_h_errno) {
2903 case HOST_NOT_FOUND:
2908 if (hp->rcode == SERVFAIL) {
2909 /* try next search element, if any */
2914 /* anything else implies that we're done */
2918 * if we got here for some reason other than DNSRCH,
2919 * we only wanted one iteration of the loop, so stop.
2921 if (!(res->options & RES_DNSRCH))
2926 switch (res->res_h_errno) {
2928 case HOST_NOT_FOUND:
2931 if (hp->rcode == SERVFAIL)
2939 * If the query has not already been tried as is then try it
2940 * unless RES_NOTLDQUERY is set and there were no dots.
2942 if ((dots || !searched || !(res->options & RES_NOTLDQUERY)) &&
2943 !(tried_as_is || root_on_list)) {
2944 ret = res_querydomainN(name, NULL, target, res);
2950 * if we got here, we didn't satisfy the search.
2951 * if we did an initial full query, return that query's h_errno
2952 * (note that we wouldn't be here if that query had succeeded).
2953 * else if we ever got a nodata, send that back as the reason.
2954 * else send back meaningless h_errno, that being the one from
2955 * the last DNSRCH we did.
2958 if (saved_herrno != -1)
2959 RES_SET_H_ERRNO(res, saved_herrno);
2960 else if (got_nodata)
2961 RES_SET_H_ERRNO(res, NO_DATA);
2962 else if (got_servfail)
2963 RES_SET_H_ERRNO(res, TRY_AGAIN);
2968 * Perform a call on res_query on the concatenation of name and domain,
2969 * removing a trailing dot from name if domain is NULL.
2972 res_querydomainN(const char *name, const char *domain,
2973 struct res_target *target, res_state res)
2975 char nbuf[MAXDNAME];
2976 const char *longname = nbuf;
2980 if (res->options & RES_DEBUG)
2981 printf(";; res_querydomain(%s, %s)\n",
2982 name, domain?domain:"<Nil>");
2984 if (domain == NULL) {
2986 * Check for trailing '.';
2987 * copy without '.' if present.
2990 if (n >= MAXDNAME) {
2991 RES_SET_H_ERRNO(res, NO_RECOVERY);
2994 if (n > 0 && name[--n] == '.') {
2995 strncpy(nbuf, name, n);
3002 if (n + d + 1 >= MAXDNAME) {
3003 RES_SET_H_ERRNO(res, NO_RECOVERY);
3006 snprintf(nbuf, sizeof(nbuf), "%s.%s", name, domain);
3008 return (res_queryN(longname, target, res));