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);
781 (char *)&((struct sockaddr_in *)addr)->sin_addr,
782 (char *)&key.sin6_addr);
788 for (ent = TAILQ_FIRST(head); ent; ent = TAILQ_NEXT(ent, pc_entry)) {
789 pol = &ent->pc_policy;
792 mp = (u_char *)&pol->addrmask.sin6_addr;
793 ep = mp + 16; /* XXX: scope field? */
794 k = (u_char *)&key.sin6_addr;
795 p = (u_char *)&pol->addr.sin6_addr;
796 for (; mp < ep && *mp; mp++, k++, p++) {
799 goto next; /* not match */
800 if (m == 0xff) /* short cut for a typical case */
810 /* matched. check if this is better than the current best. */
811 if (matchlen > bestmatchlen) {
813 bestmatchlen = matchlen;
828 set_source(struct ai_order *aio, struct policyhead *ph)
830 struct addrinfo ai = *aio->aio_ai;
831 struct sockaddr_storage ss;
835 /* set unspec ("no source is available"), just in case */
836 aio->aio_srcsa.sa_family = AF_UNSPEC;
837 aio->aio_srcscope = -1;
839 switch(ai.ai_family) {
845 default: /* ignore unsupported AFs explicitly */
849 /* XXX: make a dummy addrinfo to call connect() */
850 ai.ai_socktype = SOCK_DGRAM;
851 ai.ai_protocol = IPPROTO_UDP; /* is UDP too specific? */
853 memset(&ss, 0, sizeof(ss));
854 memcpy(&ss, ai.ai_addr, ai.ai_addrlen);
855 ai.ai_addr = (struct sockaddr *)&ss;
856 get_port(&ai, "1", 0);
858 /* open a socket to get the source address for the given dst */
859 if ((s = _socket(ai.ai_family, ai.ai_socktype, ai.ai_protocol)) < 0)
860 return; /* give up */
862 if (ai.ai_family == AF_INET6) {
863 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)ai.ai_addr;
866 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr))
867 (void)_setsockopt(s, IPPROTO_IPV6, IPV6_V6ONLY,
868 (char *)&off, sizeof(off));
871 if (_connect(s, ai.ai_addr, ai.ai_addrlen) < 0)
873 srclen = ai.ai_addrlen;
874 if (_getsockname(s, &aio->aio_srcsa, &srclen) < 0) {
875 aio->aio_srcsa.sa_family = AF_UNSPEC;
878 aio->aio_srcscope = gai_addr2scopetype(&aio->aio_srcsa);
879 aio->aio_srcpolicy = match_addrselectpolicy(&aio->aio_srcsa, ph);
880 aio->aio_matchlen = matchlen(&aio->aio_srcsa, aio->aio_ai->ai_addr);
882 if (ai.ai_family == AF_INET6) {
883 struct in6_ifreq ifr6;
886 memset(&ifr6, 0, sizeof(ifr6));
887 memcpy(&ifr6.ifr_addr, ai.ai_addr, ai.ai_addrlen);
888 if (_ioctl(s, SIOCGIFAFLAG_IN6, &ifr6) == 0) {
889 flags6 = ifr6.ifr_ifru.ifru_flags6;
890 if ((flags6 & IN6_IFF_DEPRECATED))
891 aio->aio_srcflag |= AIO_SRCFLAG_DEPRECATED;
902 matchlen(struct sockaddr *src, struct sockaddr *dst)
909 switch (src->sa_family) {
912 s = (u_char *)&((struct sockaddr_in6 *)src)->sin6_addr;
913 d = (u_char *)&((struct sockaddr_in6 *)dst)->sin6_addr;
914 addrlen = sizeof(struct in6_addr);
919 s = (u_char *)&((struct sockaddr_in *)src)->sin_addr;
920 d = (u_char *)&((struct sockaddr_in *)dst)->sin_addr;
921 addrlen = sizeof(struct in_addr);
929 if ((r = (*d++ ^ *s++)) != 0) {
930 while (r < addrlen * 8) {
941 comp_dst(const void *arg1, const void *arg2)
943 const struct ai_order *dst1 = arg1, *dst2 = arg2;
946 * Rule 1: Avoid unusable destinations.
947 * XXX: we currently do not consider if an appropriate route exists.
949 if (dst1->aio_srcsa.sa_family != AF_UNSPEC &&
950 dst2->aio_srcsa.sa_family == AF_UNSPEC) {
953 if (dst1->aio_srcsa.sa_family == AF_UNSPEC &&
954 dst2->aio_srcsa.sa_family != AF_UNSPEC) {
958 /* Rule 2: Prefer matching scope. */
959 if (dst1->aio_dstscope == dst1->aio_srcscope &&
960 dst2->aio_dstscope != dst2->aio_srcscope) {
963 if (dst1->aio_dstscope != dst1->aio_srcscope &&
964 dst2->aio_dstscope == dst2->aio_srcscope) {
968 /* Rule 3: Avoid deprecated addresses. */
969 if (dst1->aio_srcsa.sa_family != AF_UNSPEC &&
970 dst2->aio_srcsa.sa_family != AF_UNSPEC) {
971 if (!(dst1->aio_srcflag & AIO_SRCFLAG_DEPRECATED) &&
972 (dst2->aio_srcflag & AIO_SRCFLAG_DEPRECATED)) {
975 if ((dst1->aio_srcflag & AIO_SRCFLAG_DEPRECATED) &&
976 !(dst2->aio_srcflag & AIO_SRCFLAG_DEPRECATED)) {
981 /* Rule 4: Prefer home addresses. */
982 /* XXX: not implemented yet */
984 /* Rule 5: Prefer matching label. */
986 if (dst1->aio_srcpolicy && dst1->aio_dstpolicy &&
987 dst1->aio_srcpolicy->pc_policy.label ==
988 dst1->aio_dstpolicy->pc_policy.label &&
989 (dst2->aio_srcpolicy == NULL || dst2->aio_dstpolicy == NULL ||
990 dst2->aio_srcpolicy->pc_policy.label !=
991 dst2->aio_dstpolicy->pc_policy.label)) {
994 if (dst2->aio_srcpolicy && dst2->aio_dstpolicy &&
995 dst2->aio_srcpolicy->pc_policy.label ==
996 dst2->aio_dstpolicy->pc_policy.label &&
997 (dst1->aio_srcpolicy == NULL || dst1->aio_dstpolicy == NULL ||
998 dst1->aio_srcpolicy->pc_policy.label !=
999 dst1->aio_dstpolicy->pc_policy.label)) {
1004 /* Rule 6: Prefer higher precedence. */
1006 if (dst1->aio_dstpolicy &&
1007 (dst2->aio_dstpolicy == NULL ||
1008 dst1->aio_dstpolicy->pc_policy.preced >
1009 dst2->aio_dstpolicy->pc_policy.preced)) {
1012 if (dst2->aio_dstpolicy &&
1013 (dst1->aio_dstpolicy == NULL ||
1014 dst2->aio_dstpolicy->pc_policy.preced >
1015 dst1->aio_dstpolicy->pc_policy.preced)) {
1020 /* Rule 7: Prefer native transport. */
1021 /* XXX: not implemented yet */
1023 /* Rule 8: Prefer smaller scope. */
1024 if (dst1->aio_dstscope >= 0 &&
1025 dst1->aio_dstscope < dst2->aio_dstscope) {
1028 if (dst2->aio_dstscope >= 0 &&
1029 dst2->aio_dstscope < dst1->aio_dstscope) {
1034 * Rule 9: Use longest matching prefix.
1035 * We compare the match length in a same AF only.
1037 if (dst1->aio_ai->ai_addr->sa_family ==
1038 dst2->aio_ai->ai_addr->sa_family &&
1039 dst1->aio_ai->ai_addr->sa_family != AF_INET) {
1040 if (dst1->aio_matchlen > dst2->aio_matchlen) {
1043 if (dst1->aio_matchlen < dst2->aio_matchlen) {
1048 /* Rule 10: Otherwise, leave the order unchanged. */
1053 * Copy from scope.c.
1054 * XXX: we should standardize the functions and link them as standard
1058 gai_addr2scopetype(struct sockaddr *sa)
1061 struct sockaddr_in6 *sa6;
1063 struct sockaddr_in *sa4;
1065 switch(sa->sa_family) {
1068 sa6 = (struct sockaddr_in6 *)sa;
1069 if (IN6_IS_ADDR_MULTICAST(&sa6->sin6_addr)) {
1070 /* just use the scope field of the multicast address */
1071 return(sa6->sin6_addr.s6_addr[2] & 0x0f);
1074 * Unicast addresses: map scope type to corresponding scope
1075 * value defined for multcast addresses.
1076 * XXX: hardcoded scope type values are bad...
1078 if (IN6_IS_ADDR_LOOPBACK(&sa6->sin6_addr))
1079 return(1); /* node local scope */
1080 if (IN6_IS_ADDR_LINKLOCAL(&sa6->sin6_addr))
1081 return(2); /* link-local scope */
1082 if (IN6_IS_ADDR_SITELOCAL(&sa6->sin6_addr))
1083 return(5); /* site-local scope */
1084 return(14); /* global scope */
1089 * IPv4 pseudo scoping according to RFC 3484.
1091 sa4 = (struct sockaddr_in *)sa;
1092 /* IPv4 autoconfiguration addresses have link-local scope. */
1093 if (((u_char *)&sa4->sin_addr)[0] == 169 &&
1094 ((u_char *)&sa4->sin_addr)[1] == 254)
1096 /* Private addresses have site-local scope. */
1097 if (((u_char *)&sa4->sin_addr)[0] == 10 ||
1098 (((u_char *)&sa4->sin_addr)[0] == 172 &&
1099 (((u_char *)&sa4->sin_addr)[1] & 0xf0) == 16) ||
1100 (((u_char *)&sa4->sin_addr)[0] == 192 &&
1101 ((u_char *)&sa4->sin_addr)[1] == 168))
1102 return(14); /* XXX: It should be 5 unless NAT */
1103 /* Loopback addresses have link-local scope. */
1104 if (((u_char *)&sa4->sin_addr)[0] == 127)
1109 errno = EAFNOSUPPORT; /* is this a good error? */
1115 explore_copy(const struct addrinfo *pai, const struct addrinfo *src0,
1116 struct addrinfo **res)
1119 struct addrinfo sentinel, *cur;
1120 const struct addrinfo *src;
1123 sentinel.ai_next = NULL;
1126 for (src = src0; src != NULL; src = src->ai_next) {
1127 if (src->ai_family != pai->ai_family)
1130 cur->ai_next = copy_ai(src);
1131 if (!cur->ai_next) {
1136 cur->ai_next->ai_socktype = pai->ai_socktype;
1137 cur->ai_next->ai_protocol = pai->ai_protocol;
1141 *res = sentinel.ai_next;
1145 freeaddrinfo(sentinel.ai_next);
1151 * passive socket -> anyaddr (0.0.0.0 or ::)
1152 * non-passive socket -> localhost (127.0.0.1 or ::1)
1155 explore_null(const struct addrinfo *pai, const char *servname,
1156 struct addrinfo **res)
1159 const struct afd *afd;
1160 struct addrinfo *ai;
1167 * filter out AFs that are not supported by the kernel
1170 s = _socket(pai->ai_family, SOCK_DGRAM, 0);
1172 if (errno != EMFILE)
1177 afd = find_afd(pai->ai_family);
1181 if (pai->ai_flags & AI_PASSIVE) {
1182 GET_AI(ai, afd, afd->a_addrany);
1183 GET_PORT(ai, servname);
1185 GET_AI(ai, afd, afd->a_loopback);
1186 GET_PORT(ai, servname);
1202 explore_numeric(const struct addrinfo *pai, const char *hostname,
1203 const char *servname, struct addrinfo **res, const char *canonname)
1205 const struct afd *afd;
1206 struct addrinfo *ai, ai0;
1208 char pton[PTON_MAX];
1213 afd = find_afd(pai->ai_family);
1217 switch (afd->a_af) {
1220 * RFC3493 requires getaddrinfo() to accept AF_INET formats
1221 * that are accepted by inet_addr() and its family. The
1222 * accepted forms includes the "classful" one, which inet_pton
1223 * does not accept. So we need to separate the case for
1226 if (inet_aton(hostname, (struct in_addr *)pton) != 1)
1230 if (inet_pton(afd->a_af, hostname, pton) != 1) {
1231 if (pai->ai_family != AF_INET6 ||
1232 (pai->ai_flags & AI_V4MAPPED) != AI_V4MAPPED)
1234 if (inet_aton(hostname, (struct in_addr *)pton) != 1)
1236 afd = &afdl[N_INET];
1238 ai0.ai_family = AF_INET;
1244 if (pai->ai_family == afd->a_af) {
1245 GET_AI(ai, afd, pton);
1246 GET_PORT(ai, servname);
1247 if ((pai->ai_flags & AI_CANONNAME)) {
1249 * Set the numeric address itself as the canonical
1250 * name, based on a clarification in RFC3493.
1252 GET_CANONNAME(ai, canonname);
1256 * XXX: This should not happen since we already matched the AF
1273 * numeric hostname with scope
1276 explore_numeric_scope(const struct addrinfo *pai, const char *hostname,
1277 const char *servname, struct addrinfo **res)
1279 #if !defined(SCOPE_DELIMITER) || !defined(INET6)
1280 return explore_numeric(pai, hostname, servname, res, hostname);
1282 const struct afd *afd;
1283 struct addrinfo *cur;
1285 char *cp, *hostname2 = NULL, *scope, *addr;
1286 struct sockaddr_in6 *sin6;
1288 afd = find_afd(pai->ai_family);
1293 return explore_numeric(pai, hostname, servname, res, hostname);
1295 cp = strchr(hostname, SCOPE_DELIMITER);
1297 return explore_numeric(pai, hostname, servname, res, hostname);
1300 * Handle special case of <scoped_address><delimiter><scope id>
1302 hostname2 = strdup(hostname);
1303 if (hostname2 == NULL)
1305 /* terminate at the delimiter */
1306 hostname2[cp - hostname] = '\0';
1310 error = explore_numeric(pai, addr, servname, res, hostname);
1314 for (cur = *res; cur; cur = cur->ai_next) {
1315 if (cur->ai_family != AF_INET6)
1317 sin6 = (struct sockaddr_in6 *)(void *)cur->ai_addr;
1318 if (ip6_str2scopeid(scope, sin6, &scopeid) == -1) {
1322 return(EAI_NONAME); /* XXX: is return OK? */
1324 sin6->sin6_scope_id = scopeid;
1330 if (error && *res) {
1339 get_canonname(const struct addrinfo *pai, struct addrinfo *ai, const char *str)
1341 if ((pai->ai_flags & AI_CANONNAME) != 0) {
1342 ai->ai_canonname = strdup(str);
1343 if (ai->ai_canonname == NULL)
1349 static struct addrinfo *
1350 get_ai(const struct addrinfo *pai, const struct afd *afd, const char *addr)
1353 struct addrinfo *ai;
1355 struct in6_addr faith_prefix;
1360 struct in6_addr mapaddr;
1365 * Transfrom an IPv4 addr into a special IPv6 addr format for
1366 * IPv6->IPv4 translation gateway. (only TCP is supported now)
1368 * +-----------------------------------+------------+
1369 * | faith prefix part (12 bytes) | embedded |
1370 * | | IPv4 addr part (4 bytes)
1371 * +-----------------------------------+------------+
1373 * faith prefix part is specified as ascii IPv6 addr format
1374 * in environmental variable GAI.
1375 * For FAITH to work correctly, routing to faith prefix must be
1376 * setup toward a machine where a FAITH daemon operates.
1377 * Also, the machine must enable some mechanizm
1378 * (e.g. faith interface hack) to divert those packet with
1379 * faith prefixed destination addr to user-land FAITH daemon.
1381 fp_str = getenv("GAI");
1382 if (fp_str && inet_pton(AF_INET6, fp_str, &faith_prefix) == 1 &&
1383 afd->a_af == AF_INET && pai->ai_socktype == SOCK_STREAM) {
1387 memcpy(&v4a, addr, sizeof v4a);
1388 v4a_top = v4a >> IN_CLASSA_NSHIFT;
1389 if (!IN_MULTICAST(v4a) && !IN_EXPERIMENTAL(v4a) &&
1390 v4a_top != 0 && v4a != IN_LOOPBACKNET) {
1391 afd = &afdl[N_INET6];
1392 memcpy(&faith_prefix.s6_addr[12], addr,
1393 sizeof(struct in_addr));
1400 if (afd->a_af == AF_INET && (pai->ai_flags & AI_V4MAPPED) != 0) {
1401 afd = &afdl[N_INET6];
1402 _map_v4v6_address(addr, (char *)&mapaddr);
1403 addr = (char *)&mapaddr;
1407 ai = (struct addrinfo *)malloc(sizeof(struct addrinfo)
1408 + (afd->a_socklen));
1412 memcpy(ai, pai, sizeof(struct addrinfo));
1413 ai->ai_addr = (struct sockaddr *)(void *)(ai + 1);
1414 memset(ai->ai_addr, 0, (size_t)afd->a_socklen);
1415 ai->ai_addr->sa_len = afd->a_socklen;
1416 ai->ai_addrlen = afd->a_socklen;
1417 ai->ai_addr->sa_family = ai->ai_family = afd->a_af;
1418 p = (char *)(void *)(ai->ai_addr);
1421 memcpy(p + afd->a_off, &faith_prefix, (size_t)afd->a_addrlen);
1424 memcpy(p + afd->a_off, addr, (size_t)afd->a_addrlen);
1428 /* XXX need to malloc() the same way we do from other functions! */
1429 static struct addrinfo *
1430 copy_ai(const struct addrinfo *pai)
1432 struct addrinfo *ai;
1435 l = sizeof(*ai) + pai->ai_addrlen;
1436 if ((ai = (struct addrinfo *)malloc(l)) == NULL)
1439 memcpy(ai, pai, sizeof(*ai));
1440 ai->ai_addr = (struct sockaddr *)(void *)(ai + 1);
1441 memcpy(ai->ai_addr, pai->ai_addr, pai->ai_addrlen);
1443 if (pai->ai_canonname) {
1444 l = strlen(pai->ai_canonname) + 1;
1445 if ((ai->ai_canonname = malloc(l)) == NULL) {
1449 strlcpy(ai->ai_canonname, pai->ai_canonname, l);
1451 /* just to make sure */
1452 ai->ai_canonname = NULL;
1461 get_portmatch(const struct addrinfo *ai, const char *servname)
1464 /* get_port does not touch first argument when matchonly == 1. */
1465 /* LINTED const cast */
1466 return get_port((struct addrinfo *)ai, servname, 1);
1470 get_port(struct addrinfo *ai, const char *servname, int matchonly)
1477 if (servname == NULL)
1479 switch (ai->ai_family) {
1489 switch (ai->ai_socktype) {
1494 case SOCK_SEQPACKET:
1498 switch (ai->ai_family) {
1511 return EAI_SOCKTYPE;
1514 error = str2number(servname, &port);
1518 if (port < 0 || port > 65535)
1522 if (ai->ai_flags & AI_NUMERICSERV)
1525 switch (ai->ai_protocol) {
1540 if ((sp = getservbyname(servname, proto)) == NULL)
1546 switch (ai->ai_family) {
1548 ((struct sockaddr_in *)(void *)
1549 ai->ai_addr)->sin_port = port;
1553 ((struct sockaddr_in6 *)(void *)
1554 ai->ai_addr)->sin6_port = port;
1563 static const struct afd *
1566 const struct afd *afd;
1568 if (af == PF_UNSPEC)
1570 for (afd = afdl; afd->a_af; afd++) {
1571 if (afd->a_af == af)
1578 * RFC 3493: AI_ADDRCONFIG check. Determines which address families are
1579 * configured on the local system and correlates with pai->ai_family value.
1580 * If an address family is not configured on the system, it will not be
1581 * queried for. For this purpose, loopback addresses are not considered
1582 * configured addresses.
1584 * XXX PF_UNSPEC -> PF_INET6 + PF_INET mapping needs to be in sync with
1588 addrconfig(struct addrinfo *pai)
1590 struct ifaddrs *ifaddrs, *ifa;
1591 struct sockaddr_in *sin;
1593 struct sockaddr_in6 *sin6;
1595 int seen_inet = 0, seen_inet6 = 0;
1597 if (getifaddrs(&ifaddrs) != 0)
1600 for (ifa = ifaddrs; ifa != NULL; ifa = ifa->ifa_next) {
1601 if (ifa->ifa_addr == NULL || (ifa->ifa_flags & IFF_UP) == 0)
1603 switch (ifa->ifa_addr->sa_family) {
1607 sin = (struct sockaddr_in *)(ifa->ifa_addr);
1608 if (htonl(sin->sin_addr.s_addr) == INADDR_LOOPBACK)
1616 sin6 = (struct sockaddr_in6 *)(ifa->ifa_addr);
1617 if (IN6_IS_ADDR_LOOPBACK(&sin6->sin6_addr))
1619 if ((ifa->ifa_flags & IFT_LOOP) != 0 &&
1620 IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr))
1622 if (is_ifdisabled(ifa->ifa_name))
1629 freeifaddrs(ifaddrs);
1631 switch(pai->ai_family) {
1633 return (seen_inet6);
1637 if (seen_inet == seen_inet6)
1639 pai->ai_family = seen_inet ? AF_INET : AF_INET6;
1647 is_ifdisabled(char *name)
1649 struct in6_ndireq nd;
1652 if ((fd = _socket(AF_INET6, SOCK_DGRAM, 0)) < 0)
1654 memset(&nd, 0, sizeof(nd));
1655 strlcpy(nd.ifname, name, sizeof(nd.ifname));
1656 if (_ioctl(fd, SIOCGIFINFO_IN6, &nd) < 0) {
1661 return ((nd.ndi.flags & ND6_IFF_IFDISABLED) != 0);
1664 /* convert a string to a scope identifier. XXX: IPv6 specific */
1666 ip6_str2scopeid(char *scope, struct sockaddr_in6 *sin6, u_int32_t *scopeid)
1669 struct in6_addr *a6;
1672 a6 = &sin6->sin6_addr;
1674 /* empty scopeid portion is invalid */
1678 if (IN6_IS_ADDR_LINKLOCAL(a6) || IN6_IS_ADDR_MC_LINKLOCAL(a6) ||
1679 IN6_IS_ADDR_MC_NODELOCAL(a6)) {
1681 * We currently assume a one-to-one mapping between links
1682 * and interfaces, so we simply use interface indices for
1683 * like-local scopes.
1685 *scopeid = if_nametoindex(scope);
1691 /* still unclear about literal, allow numeric only - placeholder */
1692 if (IN6_IS_ADDR_SITELOCAL(a6) || IN6_IS_ADDR_MC_SITELOCAL(a6))
1694 if (IN6_IS_ADDR_MC_ORGLOCAL(a6))
1697 goto trynumeric; /* global */
1699 /* try to convert to a numeric id as a last resort */
1702 lscopeid = strtoul(scope, &ep, 10);
1703 *scopeid = (u_int32_t)(lscopeid & 0xffffffffUL);
1704 if (errno == 0 && ep && *ep == '\0' && *scopeid == lscopeid)
1714 addrinfo_id_func(char *buffer, size_t *buffer_size, va_list ap,
1720 const int op_id = 0; /* identifies the getaddrinfo for the cache */
1722 struct addrinfo *hints;
1725 int ai_flags, ai_family, ai_socktype, ai_protocol;
1726 size_t desired_size, size;
1728 statp = __res_state();
1729 res_options = statp->options & (RES_RECURSE | RES_DEFNAMES |
1730 RES_DNSRCH | RES_NOALIASES | RES_USE_INET6);
1732 hostname = va_arg(ap, char *);
1733 hints = va_arg(ap, struct addrinfo *);
1735 desired_size = sizeof(res_options) + sizeof(int) + sizeof(int) * 4;
1736 if (hostname != NULL) {
1737 size = strlen(hostname);
1738 desired_size += size + 1;
1742 if (desired_size > *buffer_size) {
1743 *buffer_size = desired_size;
1748 ai_flags = ai_family = ai_socktype = ai_protocol = 0;
1750 ai_flags = hints->ai_flags;
1751 ai_family = hints->ai_family;
1752 ai_socktype = hints->ai_socktype;
1753 ai_protocol = hints->ai_protocol;
1757 memcpy(p, &res_options, sizeof(res_options));
1758 p += sizeof(res_options);
1760 memcpy(p, &op_id, sizeof(int));
1763 memcpy(p, &ai_flags, sizeof(int));
1766 memcpy(p, &ai_family, sizeof(int));
1769 memcpy(p, &ai_socktype, sizeof(int));
1772 memcpy(p, &ai_protocol, sizeof(int));
1775 if (hostname != NULL)
1776 memcpy(p, hostname, size);
1778 *buffer_size = desired_size;
1779 return (NS_SUCCESS);
1783 addrinfo_marshal_func(char *buffer, size_t *buffer_size, void *retval,
1784 va_list ap, void *cache_mdata)
1786 struct addrinfo *ai, *cai;
1788 size_t desired_size, size, ai_size;
1790 ai = *((struct addrinfo **)retval);
1792 desired_size = sizeof(size_t);
1794 for (cai = ai; cai != NULL; cai = cai->ai_next) {
1795 desired_size += sizeof(struct addrinfo) + cai->ai_addrlen;
1796 if (cai->ai_canonname != NULL)
1797 desired_size += sizeof(size_t) +
1798 strlen(cai->ai_canonname);
1802 if (desired_size > *buffer_size) {
1803 /* this assignment is here for future use */
1805 *buffer_size = desired_size;
1809 memset(buffer, 0, desired_size);
1812 memcpy(p, &ai_size, sizeof(size_t));
1813 p += sizeof(size_t);
1814 for (cai = ai; cai != NULL; cai = cai->ai_next) {
1815 memcpy(p, cai, sizeof(struct addrinfo));
1816 p += sizeof(struct addrinfo);
1818 memcpy(p, cai->ai_addr, cai->ai_addrlen);
1819 p += cai->ai_addrlen;
1821 if (cai->ai_canonname != NULL) {
1822 size = strlen(cai->ai_canonname);
1823 memcpy(p, &size, sizeof(size_t));
1824 p += sizeof(size_t);
1826 memcpy(p, cai->ai_canonname, size);
1831 return (NS_SUCCESS);
1835 addrinfo_unmarshal_func(char *buffer, size_t buffer_size, void *retval,
1836 va_list ap, void *cache_mdata)
1838 struct addrinfo new_ai, *result, *sentinel, *lasts;
1841 size_t ai_size, ai_i, size;
1844 memcpy(&ai_size, p, sizeof(size_t));
1845 p += sizeof(size_t);
1849 for (ai_i = 0; ai_i < ai_size; ++ai_i) {
1850 memcpy(&new_ai, p, sizeof(struct addrinfo));
1851 p += sizeof(struct addrinfo);
1852 size = new_ai.ai_addrlen + sizeof(struct addrinfo) +
1855 sentinel = (struct addrinfo *)malloc(size);
1856 memset(sentinel, 0, size);
1858 memcpy(sentinel, &new_ai, sizeof(struct addrinfo));
1859 sentinel->ai_addr = (struct sockaddr *)_ALIGN((char *)sentinel +
1860 sizeof(struct addrinfo));
1862 memcpy(sentinel->ai_addr, p, new_ai.ai_addrlen);
1863 p += new_ai.ai_addrlen;
1865 if (new_ai.ai_canonname != NULL) {
1866 memcpy(&size, p, sizeof(size_t));
1867 p += sizeof(size_t);
1869 sentinel->ai_canonname = (char *)malloc(size + 1);
1870 memset(sentinel->ai_canonname, 0, size + 1);
1872 memcpy(sentinel->ai_canonname, p, size);
1876 if (result == NULL) {
1880 lasts->ai_next = sentinel;
1885 *((struct addrinfo **)retval) = result;
1886 return (NS_SUCCESS);
1888 #endif /* NS_CACHING */
1891 * FQDN hostname, DNS lookup
1894 explore_fqdn(const struct addrinfo *pai, const char *hostname,
1895 const char *servname, struct addrinfo **res)
1897 struct addrinfo *result;
1898 struct addrinfo *cur;
1902 static const nss_cache_info cache_info =
1903 NS_COMMON_CACHE_INFO_INITIALIZER(
1904 hosts, NULL, addrinfo_id_func, addrinfo_marshal_func,
1905 addrinfo_unmarshal_func);
1907 static const ns_dtab dtab[] = {
1908 NS_FILES_CB(_files_getaddrinfo, NULL)
1909 { NSSRC_DNS, _dns_getaddrinfo, NULL }, /* force -DHESIOD */
1910 NS_NIS_CB(_yp_getaddrinfo, NULL)
1912 NS_CACHE_CB(&cache_info)
1920 * if the servname does not match socktype/protocol, ignore it.
1922 if (get_portmatch(pai, servname) != 0)
1925 switch (_nsdispatch(&result, dtab, NSDB_HOSTS, "getaddrinfo",
1926 default_dns_files, hostname, pai)) {
1938 for (cur = result; cur; cur = cur->ai_next) {
1939 GET_PORT(cur, servname);
1940 /* canonname should be filled already */
1951 freeaddrinfo(result);
1956 static const char AskedForGot[] =
1957 "gethostby*.getanswer: asked for \"%s\", got \"%s\"";
1960 static struct addrinfo *
1961 getanswer(const querybuf *answer, int anslen, const char *qname, int qtype,
1962 const struct addrinfo *pai, res_state res)
1964 struct addrinfo sentinel, *cur;
1966 const struct afd *afd;
1973 int type, class, ancount, qdcount;
1974 int haveanswer, had_error;
1975 char tbuf[MAXDNAME];
1976 int (*name_ok)(const char *);
1977 char hostbuf[8*1024];
1979 memset(&sentinel, 0, sizeof(sentinel));
1983 eom = answer->buf + anslen;
1987 case T_ANY: /*use T_ANY only for T_A/T_AAAA lookup*/
1991 return (NULL); /* XXX should be abort(); */
1994 * find first satisfactory answer
1997 ancount = ntohs(hp->ancount);
1998 qdcount = ntohs(hp->qdcount);
2000 ep = hostbuf + sizeof hostbuf;
2001 cp = answer->buf + HFIXEDSZ;
2003 RES_SET_H_ERRNO(res, NO_RECOVERY);
2006 n = dn_expand(answer->buf, eom, cp, bp, ep - bp);
2007 if ((n < 0) || !(*name_ok)(bp)) {
2008 RES_SET_H_ERRNO(res, NO_RECOVERY);
2012 if (qtype == T_A || qtype == T_AAAA || qtype == T_ANY) {
2013 /* res_send() has already verified that the query name is the
2014 * same as the one we sent; this just gets the expanded name
2015 * (i.e., with the succeeding search-domain tacked on).
2017 n = strlen(bp) + 1; /* for the \0 */
2018 if (n >= MAXHOSTNAMELEN) {
2019 RES_SET_H_ERRNO(res, NO_RECOVERY);
2024 /* The qname can be abbreviated, but h_name is now absolute. */
2029 while (ancount-- > 0 && cp < eom && !had_error) {
2030 n = dn_expand(answer->buf, eom, cp, bp, ep - bp);
2031 if ((n < 0) || !(*name_ok)(bp)) {
2036 type = _getshort(cp);
2037 cp += INT16SZ; /* type */
2038 class = _getshort(cp);
2039 cp += INT16SZ + INT32SZ; /* class, TTL */
2041 cp += INT16SZ; /* len */
2042 if (class != C_IN) {
2043 /* XXX - debug? syslog? */
2045 continue; /* XXX - had_error++ ? */
2047 if ((qtype == T_A || qtype == T_AAAA || qtype == T_ANY) &&
2049 n = dn_expand(answer->buf, eom, cp, tbuf, sizeof tbuf);
2050 if ((n < 0) || !(*name_ok)(tbuf)) {
2055 /* Get canonical name. */
2056 n = strlen(tbuf) + 1; /* for the \0 */
2057 if (n > ep - bp || n >= MAXHOSTNAMELEN) {
2061 strlcpy(bp, tbuf, ep - bp);
2066 if (qtype == T_ANY) {
2067 if (!(type == T_A || type == T_AAAA)) {
2071 } else if (type != qtype) {
2073 if (type != T_KEY && type != T_SIG &&
2075 syslog(LOG_NOTICE|LOG_AUTH,
2076 "gethostby*.getanswer: asked for \"%s %s %s\", got type \"%s\"",
2077 qname, p_class(C_IN), p_type(qtype),
2081 continue; /* XXX - had_error++ ? */
2086 if (strcasecmp(canonname, bp) != 0) {
2088 syslog(LOG_NOTICE|LOG_AUTH,
2089 AskedForGot, canonname, bp);
2092 continue; /* XXX - had_error++ ? */
2094 if (type == T_A && n != INADDRSZ) {
2098 if (type == T_AAAA && n != IN6ADDRSZ) {
2102 #ifdef FILTER_V4MAPPED
2103 if (type == T_AAAA) {
2104 struct in6_addr in6;
2105 memcpy(&in6, cp, sizeof(in6));
2106 if (IN6_IS_ADDR_V4MAPPED(&in6)) {
2116 nn = strlen(bp) + 1; /* for the \0 */
2120 /* don't overwrite pai */
2122 ai.ai_family = (type == T_A) ? AF_INET : AF_INET6;
2123 afd = find_afd(ai.ai_family);
2128 cur->ai_next = get_ai(&ai, afd, (const char *)cp);
2129 if (cur->ai_next == NULL)
2131 while (cur && cur->ai_next)
2142 #if defined(RESOLVSORT)
2144 * We support only IPv4 address for backward
2145 * compatibility against gethostbyname(3).
2147 if (res->nsort && qtype == T_A) {
2148 if (addr4sort(&sentinel, res) < 0) {
2149 freeaddrinfo(sentinel.ai_next);
2150 RES_SET_H_ERRNO(res, NO_RECOVERY);
2154 #endif /*RESOLVSORT*/
2156 (void)get_canonname(pai, sentinel.ai_next, qname);
2158 (void)get_canonname(pai, sentinel.ai_next, canonname);
2159 RES_SET_H_ERRNO(res, NETDB_SUCCESS);
2160 return sentinel.ai_next;
2164 * We could have walked a CNAME chain, but the ultimate target
2165 * may not have what we looked for.
2167 RES_SET_H_ERRNO(res, ntohs(hp->ancount) > 0 ? NO_DATA : NO_RECOVERY);
2173 struct addrinfo *ai;
2178 addr4sort(struct addrinfo *sentinel, res_state res)
2180 struct addrinfo *ai;
2181 struct addr_ptr *addrs, addr;
2182 struct sockaddr_in *sin;
2189 for (ai = sentinel->ai_next; ai; ai = ai->ai_next)
2192 return 0; /* We don't need sorting. */
2193 if ((addrs = malloc(sizeof(struct addr_ptr) * naddrs)) == NULL)
2196 for (ai = sentinel->ai_next; ai; ai = ai->ai_next) {
2197 sin = (struct sockaddr_in *)ai->ai_addr;
2198 for (j = 0; (unsigned)j < res->nsort; j++) {
2199 if (res->sort_list[j].addr.s_addr ==
2200 (sin->sin_addr.s_addr & res->sort_list[j].mask))
2205 if (needsort == 0 && i > 0 && j < addrs[i - 1].aval)
2214 while (needsort < naddrs) {
2215 for (j = needsort - 1; j >= 0; j--) {
2216 if (addrs[j].aval > addrs[j+1].aval) {
2218 addrs[j] = addrs[j + 1];
2219 addrs[j + 1] = addr;
2227 for (i = 0; i < naddrs; ++i) {
2228 ai->ai_next = addrs[i].ai;
2235 #endif /*RESOLVSORT*/
2239 _dns_getaddrinfo(void *rv, void *cb_data, va_list ap)
2241 struct addrinfo *ai, ai0;
2242 querybuf *buf, *buf2;
2243 const char *hostname;
2244 const struct addrinfo *pai;
2245 struct addrinfo sentinel, *cur;
2246 struct res_target q, q2;
2251 hostname = va_arg(ap, char *);
2252 pai = va_arg(ap, const struct addrinfo *);
2254 memset(&q, 0, sizeof(q));
2255 memset(&q2, 0, sizeof(q2));
2256 memset(&sentinel, 0, sizeof(sentinel));
2259 res = __res_state();
2261 buf = malloc(sizeof(*buf));
2263 RES_SET_H_ERRNO(res, NETDB_INTERNAL);
2266 buf2 = malloc(sizeof(*buf2));
2269 RES_SET_H_ERRNO(res, NETDB_INTERNAL);
2273 if (pai->ai_family == AF_INET6 &&
2274 (pai->ai_flags & AI_V4MAPPED) == AI_V4MAPPED) {
2276 ai0.ai_family = AF_UNSPEC;
2280 switch (pai->ai_family) {
2285 q.answer = buf->buf;
2286 q.anslen = sizeof(buf->buf);
2291 q2.answer = buf2->buf;
2292 q2.anslen = sizeof(buf2->buf);
2298 q.answer = buf->buf;
2299 q.anslen = sizeof(buf->buf);
2305 q.answer = buf->buf;
2306 q.anslen = sizeof(buf->buf);
2314 if ((res->options & RES_INIT) == 0 && res_ninit(res) == -1) {
2315 RES_SET_H_ERRNO(res, NETDB_INTERNAL);
2321 if (res_searchN(hostname, &q, res) < 0) {
2328 ai = getanswer(buf2, q2.n, q2.name, q2.qtype, pai, res);
2331 while (cur && cur->ai_next)
2335 if (ai == NULL || pai->ai_family != AF_UNSPEC ||
2336 (pai->ai_flags & (AI_ALL | AI_V4MAPPED)) != AI_V4MAPPED) {
2337 ai = getanswer(buf, q.n, q.name, q.qtype, pai, res);
2343 if (sentinel.ai_next == NULL)
2344 switch (res->res_h_errno) {
2345 case HOST_NOT_FOUND:
2353 *((struct addrinfo **)rv) = sentinel.ai_next;
2358 _sethtent(FILE **hostf)
2361 *hostf = fopen(_PATH_HOSTS, "r");
2367 _endhtent(FILE **hostf)
2370 (void) fclose(*hostf);
2375 static struct addrinfo *
2376 _gethtent(FILE **hostf, const char *name, const struct addrinfo *pai)
2379 char *cp, *tname, *cname;
2380 struct addrinfo hints, *res0, *res;
2383 char hostbuf[8*1024];
2385 if (!*hostf && !(*hostf = fopen(_PATH_HOSTS, "r")))
2388 if (!(p = fgets(hostbuf, sizeof hostbuf, *hostf)))
2392 cp = strpbrk(p, "#\n");
2395 if (!(cp = strpbrk(p, " \t")))
2400 /* if this is not something we're looking for, skip it. */
2402 if (*cp == ' ' || *cp == '\t') {
2409 if ((cp = strpbrk(cp, " \t")) != NULL)
2411 if (strcasecmp(name, tname) == 0)
2417 /* we should not glob socktype/protocol here */
2418 memset(&hints, 0, sizeof(hints));
2419 hints.ai_family = pai->ai_family;
2420 hints.ai_socktype = SOCK_DGRAM;
2421 hints.ai_protocol = 0;
2422 hints.ai_flags = AI_NUMERICHOST;
2423 if (pai->ai_family == AF_INET6 &&
2424 (pai->ai_flags & AI_V4MAPPED) == AI_V4MAPPED)
2425 hints.ai_flags |= AI_V4MAPPED;
2426 error = getaddrinfo(addr, "0", &hints, &res0);
2429 #ifdef FILTER_V4MAPPED
2430 /* XXX should check all items in the chain */
2431 if (res0->ai_family == AF_INET6 &&
2432 IN6_IS_ADDR_V4MAPPED(&((struct sockaddr_in6 *)res0->ai_addr)->sin6_addr)) {
2437 for (res = res0; res; res = res->ai_next) {
2439 res->ai_flags = pai->ai_flags;
2440 res->ai_socktype = pai->ai_socktype;
2441 res->ai_protocol = pai->ai_protocol;
2443 if (pai->ai_flags & AI_CANONNAME) {
2444 if (get_canonname(pai, res, cname) != 0) {
2453 static struct addrinfo *
2454 _getht(FILE **hostf, const char *name, const struct addrinfo *pai,
2455 struct addrinfo *cur)
2459 while ((p = _gethtent(hostf, name, pai)) != NULL) {
2461 while (cur && cur->ai_next)
2469 _files_getaddrinfo(void *rv, void *cb_data, va_list ap)
2472 const struct addrinfo *pai;
2473 struct addrinfo sentinel, *cur;
2476 name = va_arg(ap, char *);
2477 pai = va_arg(ap, struct addrinfo *);
2479 memset(&sentinel, 0, sizeof(sentinel));
2483 if (pai->ai_family == AF_INET6 &&
2484 (pai->ai_flags & (AI_ALL | AI_V4MAPPED)) == AI_V4MAPPED) {
2485 struct addrinfo ai0 = *pai;
2487 ai0.ai_flags &= ~AI_V4MAPPED;
2488 cur = _getht(&hostf, name, &ai0, cur);
2489 if (sentinel.ai_next == NULL) {
2491 ai0.ai_flags |= AI_V4MAPPED;
2492 cur = _getht(&hostf, name, &ai0, cur);
2495 cur = _getht(&hostf, name, pai, cur);
2498 *((struct addrinfo **)rv) = sentinel.ai_next;
2499 if (sentinel.ai_next == NULL)
2506 static struct addrinfo *
2507 _yphostent(char *line, const struct addrinfo *pai)
2509 struct addrinfo sentinel, *cur;
2510 struct addrinfo hints, *res, *res0;
2513 const char *addr, *canonname;
2517 addr = canonname = NULL;
2519 memset(&sentinel, 0, sizeof(sentinel));
2523 /* terminate line */
2524 cp = strchr(p, '\n');
2531 cp = strpbrk(p, " \t");
2533 if (canonname == NULL)
2543 if (*cp == ' ' || *cp == '\t') {
2549 if ((cp = strpbrk(cp, " \t")) != NULL)
2554 hints.ai_flags = AI_NUMERICHOST;
2555 if (pai->ai_family == AF_INET6 &&
2556 (pai->ai_flags & AI_V4MAPPED) == AI_V4MAPPED)
2557 hints.ai_flags |= AI_V4MAPPED;
2558 error = getaddrinfo(addr, NULL, &hints, &res0);
2560 for (res = res0; res; res = res->ai_next) {
2562 res->ai_flags = pai->ai_flags;
2564 if (pai->ai_flags & AI_CANONNAME)
2565 (void)get_canonname(pai, res, canonname);
2570 cur->ai_next = res0;
2571 while (cur && cur->ai_next)
2581 return sentinel.ai_next;
2586 _yp_getaddrinfo(void *rv, void *cb_data, va_list ap)
2588 struct addrinfo sentinel, *cur;
2589 struct addrinfo *ai = NULL;
2593 const struct addrinfo *pai;
2596 if (_yp_check(&ypdomain) == 0)
2599 name = va_arg(ap, char *);
2600 pai = va_arg(ap, const struct addrinfo *);
2602 memset(&sentinel, 0, sizeof(sentinel));
2605 /* ipnodes.byname can hold both IPv4/v6 */
2606 r = yp_match(ypdomain, "ipnodes.byname", name,
2607 (int)strlen(name), &ypbuf, &ypbuflen);
2609 ai = _yphostent(ypbuf, pai);
2612 while (cur && cur->ai_next)
2619 struct sockaddr_in6 *sin6;
2621 switch (ai->ai_family) {
2625 sin6 = (struct sockaddr_in6 *)ai->ai_addr;
2626 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr))
2632 /* hosts.byname is only for IPv4 (Solaris8) */
2633 if (pai->ai_family == AF_UNSPEC || pai->ai_family == AF_INET ||
2634 ((pai->ai_family == AF_INET6 &&
2635 (pai->ai_flags & AI_V4MAPPED) == AI_V4MAPPED) &&
2636 (ai == NULL || (pai->ai_flags & AI_ALL) == AI_ALL))) {
2637 r = yp_match(ypdomain, "hosts.byname", name,
2638 (int)strlen(name), &ypbuf, &ypbuflen);
2640 struct addrinfo ai4;
2643 if (pai->ai_family == AF_UNSPEC)
2644 ai4.ai_family = AF_INET;
2645 ai = _yphostent(ypbuf, &ai4);
2648 while (cur && cur->ai_next)
2656 if (sentinel.ai_next == NULL) {
2657 RES_SET_H_ERRNO(__res_state(), HOST_NOT_FOUND);
2660 *((struct addrinfo **)rv) = sentinel.ai_next;
2665 /* resolver logic */
2668 * Formulate a normal query, send, and await answer.
2669 * Returned answer is placed in supplied buffer "answer".
2670 * Perform preliminary check of answer, returning success only
2671 * if no error is indicated and the answer count is nonzero.
2672 * Return the size of the response on success, -1 on error.
2673 * Error number is left in h_errno.
2675 * Caller must parse answer and determine whether it answers the question.
2678 res_queryN(const char *name, struct res_target *target, res_state res)
2684 struct res_target *t;
2691 buf = malloc(MAXPACKET);
2693 RES_SET_H_ERRNO(res, NETDB_INTERNAL);
2697 for (t = target; t; t = t->next) {
2702 hp = (HEADER *)(void *)t->answer;
2704 /* make it easier... */
2710 oflags = res->_flags;
2713 hp->rcode = NOERROR; /* default */
2716 if (res->options & RES_DEBUG)
2717 printf(";; res_query(%s, %d, %d)\n", name, class, type);
2720 n = res_nmkquery(res, QUERY, name, class, type, NULL, 0, NULL,
2722 if (n > 0 && (res->_flags & RES_F_EDNS0ERR) == 0 &&
2723 (res->options & (RES_USE_EDNS0|RES_USE_DNSSEC)) != 0U)
2724 n = res_nopt(res, n, buf, MAXPACKET, anslen);
2727 if (res->options & RES_DEBUG)
2728 printf(";; res_query: mkquery failed\n");
2731 RES_SET_H_ERRNO(res, NO_RECOVERY);
2734 n = res_nsend(res, buf, n, answer, anslen);
2737 * if the query choked with EDNS0, retry
2740 if ((res->options & (RES_USE_EDNS0|RES_USE_DNSSEC))
2742 ((oflags ^ res->_flags) & RES_F_EDNS0ERR) != 0) {
2743 res->_flags |= RES_F_EDNS0ERR;
2744 if (res->options & RES_DEBUG)
2745 printf(";; res_nquery: retry without EDNS0\n");
2748 rcode = hp->rcode; /* record most recent error */
2750 if (res->options & RES_DEBUG)
2751 printf(";; res_query: send error\n");
2757 hp->rcode = FORMERR; /* XXX not very informative */
2758 if (hp->rcode != NOERROR || ntohs(hp->ancount) == 0) {
2759 rcode = hp->rcode; /* record most recent error */
2761 if (res->options & RES_DEBUG)
2762 printf(";; rcode = %u, ancount=%u\n", hp->rcode,
2763 ntohs(hp->ancount));
2768 ancount += ntohs(hp->ancount);
2778 RES_SET_H_ERRNO(res, HOST_NOT_FOUND);
2781 RES_SET_H_ERRNO(res, TRY_AGAIN);
2784 RES_SET_H_ERRNO(res, NO_DATA);
2790 RES_SET_H_ERRNO(res, NO_RECOVERY);
2799 * Formulate a normal query, send, and retrieve answer in supplied buffer.
2800 * Return the size of the response on success, -1 on error.
2801 * If enabled, implement search rules until answer or unrecoverable failure
2802 * is detected. Error code, if any, is left in h_errno.
2805 res_searchN(const char *name, struct res_target *target, res_state res)
2807 const char *cp, * const *domain;
2808 HEADER *hp = (HEADER *)(void *)target->answer; /*XXX*/
2810 int trailing_dot, ret, saved_herrno;
2811 int got_nodata = 0, got_servfail = 0, root_on_list = 0;
2812 int tried_as_is = 0;
2814 char abuf[MAXDNAME];
2817 RES_SET_H_ERRNO(res, HOST_NOT_FOUND); /* default, if we never query */
2819 for (cp = name; *cp; cp++)
2820 dots += (*cp == '.');
2822 if (cp > name && *--cp == '.')
2826 * if there aren't any dots, it could be a user-level alias
2829 (cp = res_hostalias(res, name, abuf, sizeof(abuf))) != NULL)
2830 return (res_queryN(cp, target, res));
2833 * If there are enough dots in the name, let's just give it a
2834 * try 'as is'. The threshold can be set with the "ndots" option.
2835 * Also, query 'as is', if there is a trailing dot in the name.
2838 if (dots >= res->ndots || trailing_dot) {
2839 ret = res_querydomainN(name, NULL, target, res);
2840 if (ret > 0 || trailing_dot)
2842 if (errno == ECONNREFUSED) {
2843 RES_SET_H_ERRNO(res, TRY_AGAIN);
2846 switch (res->res_h_errno) {
2848 case HOST_NOT_FOUND:
2851 if (hp->rcode == SERVFAIL)
2857 saved_herrno = res->res_h_errno;
2862 * We do at least one level of search if
2863 * - there is no dot and RES_DEFNAME is set, or
2864 * - there is at least one dot, there is no trailing dot,
2865 * and RES_DNSRCH is set.
2867 if ((!dots && (res->options & RES_DEFNAMES)) ||
2868 (dots && !trailing_dot && (res->options & RES_DNSRCH))) {
2871 for (domain = (const char * const *)res->dnsrch;
2876 if (domain[0][0] == '\0' ||
2877 (domain[0][0] == '.' && domain[0][1] == '\0'))
2880 if (root_on_list && tried_as_is)
2883 ret = res_querydomainN(name, *domain, target, res);
2888 * If no server present, give up.
2889 * If name isn't found in this domain,
2890 * keep trying higher domains in the search list
2891 * (if that's enabled).
2892 * On a NO_DATA error, keep trying, otherwise
2893 * a wildcard entry of another type could keep us
2894 * from finding this entry higher in the domain.
2895 * If we get some other error (negative answer or
2896 * server failure), then stop searching up,
2897 * but try the input name below in case it's
2900 if (errno == ECONNREFUSED) {
2901 RES_SET_H_ERRNO(res, TRY_AGAIN);
2905 switch (res->res_h_errno) {
2909 case HOST_NOT_FOUND:
2914 if (hp->rcode == SERVFAIL) {
2915 /* try next search element, if any */
2920 /* anything else implies that we're done */
2924 * if we got here for some reason other than DNSRCH,
2925 * we only wanted one iteration of the loop, so stop.
2927 if (!(res->options & RES_DNSRCH))
2932 switch (res->res_h_errno) {
2934 case HOST_NOT_FOUND:
2937 if (hp->rcode == SERVFAIL)
2945 * If the query has not already been tried as is then try it
2946 * unless RES_NOTLDQUERY is set and there were no dots.
2948 if ((dots || !searched || !(res->options & RES_NOTLDQUERY)) &&
2949 !(tried_as_is || root_on_list)) {
2950 ret = res_querydomainN(name, NULL, target, res);
2956 * if we got here, we didn't satisfy the search.
2957 * if we did an initial full query, return that query's h_errno
2958 * (note that we wouldn't be here if that query had succeeded).
2959 * else if we ever got a nodata, send that back as the reason.
2960 * else send back meaningless h_errno, that being the one from
2961 * the last DNSRCH we did.
2964 if (saved_herrno != -1)
2965 RES_SET_H_ERRNO(res, saved_herrno);
2966 else if (got_nodata)
2967 RES_SET_H_ERRNO(res, NO_DATA);
2968 else if (got_servfail)
2969 RES_SET_H_ERRNO(res, TRY_AGAIN);
2974 * Perform a call on res_query on the concatenation of name and domain,
2975 * removing a trailing dot from name if domain is NULL.
2978 res_querydomainN(const char *name, const char *domain,
2979 struct res_target *target, res_state res)
2981 char nbuf[MAXDNAME];
2982 const char *longname = nbuf;
2986 if (res->options & RES_DEBUG)
2987 printf(";; res_querydomain(%s, %s)\n",
2988 name, domain?domain:"<Nil>");
2990 if (domain == NULL) {
2992 * Check for trailing '.';
2993 * copy without '.' if present.
2996 if (n >= MAXDNAME) {
2997 RES_SET_H_ERRNO(res, NO_RECOVERY);
3000 if (n > 0 && name[--n] == '.') {
3001 strncpy(nbuf, name, n);
3008 if (n + d + 1 >= MAXDNAME) {
3009 RES_SET_H_ERRNO(res, NO_RECOVERY);
3012 snprintf(nbuf, sizeof(nbuf), "%s.%s", name, domain);
3014 return (res_queryN(longname, target, res));