1 /* $FreeBSD: src/lib/libc/net/getaddrinfo.c,v 1.87 2008/02/03 19:07:55 ume Exp $ */
2 /* $KAME: getaddrinfo.c,v 1.15 2000/07/09 04:37:24 itojun Exp $ */
5 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. Neither the name of the project nor the names of its contributors
17 * may be used to endorse or promote products derived from this software
18 * without specific prior written permission.
20 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * "#ifdef FAITH" part is local hack for supporting IPv4-v6 translator.
36 * Issues to be discussed:
37 * - Return values. There are nonstandard return values defined and used
38 * in the source code. This is because RFC2553 is silent about which error
39 * code must be returned for which situation.
40 * - freeaddrinfo(NULL). RFC2553 is silent about it. XNET 5.2 says it is
41 * invalid. current code - SEGV on freeaddrinfo(NULL)
44 * - The code filters out AFs that are not supported by the kernel,
45 * when globbing NULL hostname (to loopback, or wildcard). Is it the right
46 * thing to do? What is the relationship with post-RFC2553 AI_ADDRCONFIG
48 * - (post-2553) semantics of AI_ADDRCONFIG itself is too vague.
49 * (1) what should we do against numeric hostname (2) what should we do
50 * against NULL hostname (3) what is AI_ADDRCONFIG itself. AF not ready?
51 * non-loopback address configured? global address configured?
53 * OS specific notes for freebsd4:
54 * - FreeBSD supported $GAI. The code does not.
57 #include "namespace.h"
58 #include <sys/types.h>
59 #include <sys/param.h>
60 #include <sys/socket.h>
62 #include <netinet/in.h>
63 #include <sys/queue.h>
65 #include <net/if_var.h>
66 #include <sys/sysctl.h>
67 #include <sys/ioctl.h>
68 #include <netinet6/in6_var.h> /* XXX */
70 #include <arpa/inet.h>
71 #include <arpa/nameser.h>
73 #include <rpcsvc/yp_prot.h>
74 #include <rpcsvc/ypclnt.h>
85 #include "res_config.h"
93 #include "un-namespace.h"
94 #include "libc_private.h"
99 #if defined(__KAME__) && defined(INET6)
108 static const char in_addrany[] = { 0, 0, 0, 0 };
109 static const char in_loopback[] = { 127, 0, 0, 1 };
111 static const char in6_addrany[] = {
112 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
114 static const char in6_loopback[] = {
115 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1
120 TAILQ_ENTRY(policyqueue) pc_entry;
122 struct in6_addrpolicy pc_policy;
125 TAILQ_HEAD(policyhead, policyqueue);
127 static const struct afd {
132 const char *a_addrany;
133 const char *a_loopback;
138 {PF_INET6, sizeof(struct in6_addr),
139 sizeof(struct sockaddr_in6),
140 offsetof(struct sockaddr_in6, sin6_addr),
141 in6_addrany, in6_loopback, 1},
146 {PF_INET, sizeof(struct in_addr),
147 sizeof(struct sockaddr_in),
148 offsetof(struct sockaddr_in, sin_addr),
149 in_addrany, in_loopback, 0},
150 {0, 0, 0, 0, NULL, NULL, 0},
157 const char *e_protostr;
159 #define WILD_AF(ex) ((ex)->e_wild & 0x01)
160 #define WILD_SOCKTYPE(ex) ((ex)->e_wild & 0x02)
161 #define WILD_PROTOCOL(ex) ((ex)->e_wild & 0x04)
164 static const struct explore explore[] = {
166 { PF_LOCAL, 0, ANY, ANY, NULL, 0x01 },
169 { PF_INET6, SOCK_DGRAM, IPPROTO_UDP, "udp", 0x07 },
170 { PF_INET6, SOCK_STREAM, IPPROTO_TCP, "tcp", 0x07 },
171 { PF_INET6, SOCK_RAW, ANY, NULL, 0x05 },
173 { PF_INET, SOCK_DGRAM, IPPROTO_UDP, "udp", 0x07 },
174 { PF_INET, SOCK_STREAM, IPPROTO_TCP, "tcp", 0x07 },
175 { PF_INET, SOCK_RAW, ANY, NULL, 0x05 },
176 { PF_UNSPEC, SOCK_DGRAM, IPPROTO_UDP, "udp", 0x07 },
177 { PF_UNSPEC, SOCK_STREAM, IPPROTO_TCP, "tcp", 0x07 },
178 { PF_UNSPEC, SOCK_RAW, ANY, NULL, 0x05 },
179 { -1, 0, 0, NULL, 0 },
188 #define AIO_SRCFLAG_DEPRECATED 0x1
192 struct sockaddr_storage aiou_ss;
193 struct sockaddr aiou_sa;
195 #define aio_srcsa aio_src_un.aiou_sa
196 u_int32_t aio_srcflag;
199 struct policyqueue *aio_srcpolicy;
200 struct policyqueue *aio_dstpolicy;
201 struct addrinfo *aio_ai;
205 static const ns_src default_dns_files[] = {
206 { NSSRC_FILES, NS_SUCCESS },
207 { NSSRC_DNS, NS_SUCCESS },
212 struct res_target *next;
213 const char *name; /* domain name */
214 int qclass, qtype; /* class and type of query */
215 u_char *answer; /* buffer to put answer */
216 int anslen; /* size of answer buffer */
217 int n; /* result length */
220 #define MAXPACKET (64*1024)
224 u_char buf[MAXPACKET];
227 static int str2number(const char *, int *);
228 static int explore_null(const struct addrinfo *,
229 const char *, struct addrinfo **);
230 static int explore_numeric(const struct addrinfo *, const char *,
231 const char *, struct addrinfo **, const char *);
232 static int explore_numeric_scope(const struct addrinfo *, const char *,
233 const char *, struct addrinfo **);
234 static int get_canonname(const struct addrinfo *,
235 struct addrinfo *, const char *);
236 static struct addrinfo *get_ai(const struct addrinfo *,
237 const struct afd *, const char *);
238 static int get_portmatch(const struct addrinfo *, const char *);
239 static int get_port(struct addrinfo *, const char *, int);
240 static const struct afd *find_afd(int);
241 static int addrconfig(struct addrinfo *);
242 static void set_source(struct ai_order *, struct policyhead *);
243 static int comp_dst(const void *, const void *);
245 static int ip6_str2scopeid(char *, struct sockaddr_in6 *, u_int32_t *);
247 static int gai_addr2scopetype(struct sockaddr *);
249 static int explore_fqdn(const struct addrinfo *, const char *,
250 const char *, struct addrinfo **);
252 static int reorder(struct addrinfo *);
253 static int get_addrselectpolicy(struct policyhead *);
254 static void free_addrselectpolicy(struct policyhead *);
255 static struct policyqueue *match_addrselectpolicy(struct sockaddr *,
256 struct policyhead *);
257 static int matchlen(struct sockaddr *, struct sockaddr *);
259 static struct addrinfo *getanswer(const querybuf *, int, const char *, int,
260 const struct addrinfo *, res_state);
261 #if defined(RESOLVSORT)
262 static int addr4sort(struct addrinfo *, res_state);
264 static int _dns_getaddrinfo(void *, void *, va_list);
265 static void _sethtent(FILE **);
266 static void _endhtent(FILE **);
267 static struct addrinfo *_gethtent(FILE **, const char *,
268 const struct addrinfo *);
269 static int _files_getaddrinfo(void *, void *, va_list);
271 static struct addrinfo *_yphostent(char *, const struct addrinfo *);
272 static int _yp_getaddrinfo(void *, void *, va_list);
275 static int addrinfo_id_func(char *, size_t *, va_list, void *);
276 static int addrinfo_marshal_func(char *, size_t *, void *, va_list,
278 static int addrinfo_unmarshal_func(char *, size_t, void *, va_list,
282 static int res_queryN(const char *, struct res_target *, res_state);
283 static int res_searchN(const char *, struct res_target *, res_state);
284 static int res_querydomainN(const char *, const char *,
285 struct res_target *, res_state);
287 /* XXX macros that make external reference is BAD. */
289 #define GET_AI(ai, afd, addr) \
291 /* external reference: pai, error, and label free */ \
292 (ai) = get_ai(pai, (afd), (addr)); \
293 if ((ai) == NULL) { \
294 error = EAI_MEMORY; \
297 } while (/*CONSTCOND*/0)
299 #define GET_PORT(ai, serv) \
301 /* external reference: error and label free */ \
302 error = get_port((ai), (serv), 0); \
305 } while (/*CONSTCOND*/0)
307 #define GET_CANONNAME(ai, str) \
309 /* external reference: pai, error and label free */ \
310 error = get_canonname(pai, (ai), (str)); \
313 } while (/*CONSTCOND*/0)
317 /* external reference: error, and label bad */ \
321 } while (/*CONSTCOND*/0)
323 #define MATCH_FAMILY(x, y, w) \
324 ((x) == (y) || (/*CONSTCOND*/(w) && ((x) == PF_UNSPEC || (y) == PF_UNSPEC)))
325 #define MATCH(x, y, w) \
326 ((x) == (y) || (/*CONSTCOND*/(w) && ((x) == ANY || (y) == ANY)))
329 freeaddrinfo(struct addrinfo *ai)
331 struct addrinfo *next;
335 if (ai->ai_canonname)
336 free(ai->ai_canonname);
337 /* no need to free(ai->ai_addr) */
344 str2number(const char *p, int *portp)
353 v = strtoul(p, &ep, 10);
354 if (errno == 0 && ep && *ep == '\0' && v <= UINT_MAX) {
362 getaddrinfo(const char *hostname, const char *servname,
363 const struct addrinfo *hints, struct addrinfo **res)
365 struct addrinfo sentinel;
366 struct addrinfo *cur;
370 struct addrinfo *pai;
371 const struct explore *ex;
374 memset(&sentinel, 0, sizeof(sentinel));
378 pai->ai_family = PF_UNSPEC;
379 pai->ai_socktype = ANY;
380 pai->ai_protocol = ANY;
382 pai->ai_canonname = NULL;
386 if (hostname == NULL && servname == NULL)
389 /* error check for hints */
390 if (hints->ai_addrlen || hints->ai_canonname ||
391 hints->ai_addr || hints->ai_next)
392 ERR(EAI_BADHINTS); /* xxx */
393 if (hints->ai_flags & ~AI_MASK)
395 switch (hints->ai_family) {
405 memcpy(pai, hints, sizeof(*pai));
408 * if both socktype/protocol are specified, check if they
409 * are meaningful combination.
411 if (pai->ai_socktype != ANY && pai->ai_protocol != ANY) {
412 for (ex = explore; ex->e_af >= 0; ex++) {
413 if (pai->ai_family != ex->e_af)
415 if (ex->e_socktype == ANY)
417 if (ex->e_protocol == ANY)
419 if (pai->ai_socktype == ex->e_socktype &&
420 pai->ai_protocol != ex->e_protocol) {
428 * check for special cases. (1) numeric servname is disallowed if
429 * socktype/protocol are left unspecified. (2) servname is disallowed
430 * for raw and other inet{,6} sockets.
432 if (MATCH_FAMILY(pai->ai_family, PF_INET, 1)
434 || MATCH_FAMILY(pai->ai_family, PF_INET6, 1)
437 ai0 = *pai; /* backup *pai */
439 if (pai->ai_family == PF_UNSPEC) {
441 pai->ai_family = PF_INET6;
443 pai->ai_family = PF_INET;
446 error = get_portmatch(pai, servname);
455 /* NULL hostname, or numeric hostname */
456 for (ex = explore; ex->e_af >= 0; ex++) {
459 /* PF_UNSPEC entries are prepared for DNS queries only */
460 if (ex->e_af == PF_UNSPEC)
463 if (!MATCH_FAMILY(pai->ai_family, ex->e_af, WILD_AF(ex)))
465 if (!MATCH(pai->ai_socktype, ex->e_socktype, WILD_SOCKTYPE(ex)))
467 if (!MATCH(pai->ai_protocol, ex->e_protocol, WILD_PROTOCOL(ex)))
470 if (pai->ai_family == PF_UNSPEC)
471 pai->ai_family = ex->e_af;
472 if (pai->ai_socktype == ANY && ex->e_socktype != ANY)
473 pai->ai_socktype = ex->e_socktype;
474 if (pai->ai_protocol == ANY && ex->e_protocol != ANY)
475 pai->ai_protocol = ex->e_protocol;
477 if (hostname == NULL)
478 error = explore_null(pai, servname, &cur->ai_next);
480 error = explore_numeric_scope(pai, hostname, servname,
486 while (cur && cur->ai_next)
492 * If numreic representation of AF1 can be interpreted as FQDN
493 * representation of AF2, we need to think again about the code below.
495 if (sentinel.ai_next) {
500 if (hostname == NULL)
501 ERR(EAI_NONAME); /* used to be EAI_NODATA */
502 if (pai->ai_flags & AI_NUMERICHOST)
505 if ((pai->ai_flags & AI_ADDRCONFIG) != 0 && !addrconfig(&ai0))
509 * hostname as alphabetical name.
510 * we would like to prefer AF_INET6 than AF_INET, so we'll make a
513 for (ex = explore; ex->e_af >= 0; ex++) {
516 /* require exact match for family field */
517 if (pai->ai_family != ex->e_af)
520 if (!MATCH(pai->ai_socktype, ex->e_socktype,
521 WILD_SOCKTYPE(ex))) {
524 if (!MATCH(pai->ai_protocol, ex->e_protocol,
525 WILD_PROTOCOL(ex))) {
529 if (pai->ai_socktype == ANY && ex->e_socktype != ANY)
530 pai->ai_socktype = ex->e_socktype;
531 if (pai->ai_protocol == ANY && ex->e_protocol != ANY)
532 pai->ai_protocol = ex->e_protocol;
534 error = explore_fqdn(pai, hostname, servname, &cur->ai_next);
536 while (cur && cur->ai_next)
540 /* XXX inhibit errors if we have the result */
541 if (sentinel.ai_next)
546 * ensure we return either:
547 * - error == 0, non-NULL *res
548 * - error != 0, NULL *res
551 if (sentinel.ai_next) {
553 * If the returned entry is for an active connection,
554 * and the given name is not numeric, reorder the
555 * list, so that the application would try the list
556 * in the most efficient order. Since the head entry
557 * of the original list may contain ai_canonname and
558 * that entry may be moved elsewhere in the new list,
559 * we keep the pointer and will restore it in the new
560 * head entry. (Note that RFC3493 requires the head
561 * entry store it when requested by the caller).
563 if (hints == NULL || !(hints->ai_flags & AI_PASSIVE)) {
568 sentinel.ai_next->ai_canonname;
569 sentinel.ai_next->ai_canonname = NULL;
571 if (sentinel.ai_next->ai_canonname ==
573 sentinel.ai_next->ai_canonname
575 } else if (canonname != NULL)
579 *res = sentinel.ai_next;
586 if (sentinel.ai_next)
587 freeaddrinfo(sentinel.ai_next);
593 reorder(struct addrinfo *sentinel)
595 struct addrinfo *ai, **aip;
596 struct ai_order *aio;
598 struct policyhead policyhead;
600 /* count the number of addrinfo elements for sorting. */
601 for (n = 0, ai = sentinel->ai_next; ai != NULL; ai = ai->ai_next, n++)
605 * If the number is small enough, we can skip the reordering process.
610 /* allocate a temporary array for sort and initialization of it. */
611 if ((aio = malloc(sizeof(*aio) * n)) == NULL)
612 return(n); /* give up reordering */
613 memset(aio, 0, sizeof(*aio) * n);
615 /* retrieve address selection policy from the kernel */
616 TAILQ_INIT(&policyhead);
617 if (!get_addrselectpolicy(&policyhead)) {
618 /* no policy is installed into kernel, we don't sort. */
623 for (i = 0, ai = sentinel->ai_next; i < n; ai = ai->ai_next, i++) {
625 aio[i].aio_dstscope = gai_addr2scopetype(ai->ai_addr);
626 aio[i].aio_dstpolicy = match_addrselectpolicy(ai->ai_addr,
628 set_source(&aio[i], &policyhead);
631 /* perform sorting. */
632 qsort(aio, n, sizeof(*aio), comp_dst);
634 /* reorder the addrinfo chain. */
635 for (i = 0, aip = &sentinel->ai_next; i < n; i++) {
636 *aip = aio[i].aio_ai;
637 aip = &aio[i].aio_ai->ai_next;
641 /* cleanup and return */
643 free_addrselectpolicy(&policyhead);
648 get_addrselectpolicy(struct policyhead *head)
651 int mib[] = { CTL_NET, PF_INET6, IPPROTO_IPV6, IPV6CTL_ADDRCTLPOLICY };
654 struct in6_addrpolicy *pol, *ep;
656 if (sysctl(mib, NELEM(mib), NULL, &l, NULL, 0) < 0)
658 if ((buf = malloc(l)) == NULL)
660 if (sysctl(mib, NELEM(mib), buf, &l, NULL, 0) < 0) {
665 ep = (struct in6_addrpolicy *)(buf + l);
666 for (pol = (struct in6_addrpolicy *)buf; pol + 1 <= ep; pol++) {
667 struct policyqueue *new;
669 if ((new = malloc(sizeof(*new))) == NULL) {
670 free_addrselectpolicy(head); /* make the list empty */
673 new->pc_policy = *pol;
674 TAILQ_INSERT_TAIL(head, new, pc_entry);
685 free_addrselectpolicy(struct policyhead *head)
687 struct policyqueue *ent, *nent;
689 for (ent = TAILQ_FIRST(head); ent; ent = nent) {
690 nent = TAILQ_NEXT(ent, pc_entry);
691 TAILQ_REMOVE(head, ent, pc_entry);
696 static struct policyqueue *
697 match_addrselectpolicy(struct sockaddr *addr, struct policyhead *head)
700 struct policyqueue *ent, *bestent = NULL;
701 struct in6_addrpolicy *pol;
702 int matchlen, bestmatchlen = -1;
703 u_char *mp, *ep, *k, *p, m;
704 struct sockaddr_in6 key;
706 switch(addr->sa_family) {
708 key = *(struct sockaddr_in6 *)addr;
711 /* convert the address into IPv4-mapped IPv6 address. */
712 memset(&key, 0, sizeof(key));
713 key.sin6_family = AF_INET6;
714 key.sin6_len = sizeof(key);
715 key.sin6_addr.s6_addr[10] = 0xff;
716 key.sin6_addr.s6_addr[11] = 0xff;
717 memcpy(&key.sin6_addr.s6_addr[12],
718 &((struct sockaddr_in *)addr)->sin_addr, 4);
724 for (ent = TAILQ_FIRST(head); ent; ent = TAILQ_NEXT(ent, pc_entry)) {
725 pol = &ent->pc_policy;
728 mp = (u_char *)&pol->addrmask.sin6_addr;
729 ep = mp + 16; /* XXX: scope field? */
730 k = (u_char *)&key.sin6_addr;
731 p = (u_char *)&pol->addr.sin6_addr;
732 for (; mp < ep && *mp; mp++, k++, p++) {
735 goto next; /* not match */
736 if (m == 0xff) /* short cut for a typical case */
746 /* matched. check if this is better than the current best. */
747 if (matchlen > bestmatchlen) {
749 bestmatchlen = matchlen;
764 set_source(struct ai_order *aio, struct policyhead *ph)
766 struct addrinfo ai = *aio->aio_ai;
767 struct sockaddr_storage ss;
771 /* set unspec ("no source is available"), just in case */
772 aio->aio_srcsa.sa_family = AF_UNSPEC;
773 aio->aio_srcscope = -1;
775 switch(ai.ai_family) {
781 default: /* ignore unsupported AFs explicitly */
785 /* XXX: make a dummy addrinfo to call connect() */
786 ai.ai_socktype = SOCK_DGRAM;
787 ai.ai_protocol = IPPROTO_UDP; /* is UDP too specific? */
789 memset(&ss, 0, sizeof(ss));
790 memcpy(&ss, ai.ai_addr, ai.ai_addrlen);
791 ai.ai_addr = (struct sockaddr *)&ss;
792 get_port(&ai, "1", 0);
794 /* open a socket to get the source address for the given dst */
795 if ((s = _socket(ai.ai_family, ai.ai_socktype, ai.ai_protocol)) < 0)
796 return; /* give up */
797 if (_connect(s, ai.ai_addr, ai.ai_addrlen) < 0)
799 srclen = ai.ai_addrlen;
800 if (_getsockname(s, &aio->aio_srcsa, &srclen) < 0) {
801 aio->aio_srcsa.sa_family = AF_UNSPEC;
804 aio->aio_srcscope = gai_addr2scopetype(&aio->aio_srcsa);
805 aio->aio_srcpolicy = match_addrselectpolicy(&aio->aio_srcsa, ph);
806 aio->aio_matchlen = matchlen(&aio->aio_srcsa, aio->aio_ai->ai_addr);
808 if (ai.ai_family == AF_INET6) {
809 struct in6_ifreq ifr6;
812 /* XXX: interface name should not be hardcoded */
813 strncpy(ifr6.ifr_name, "lo0", sizeof(ifr6.ifr_name));
814 memset(&ifr6, 0, sizeof(ifr6));
815 memcpy(&ifr6.ifr_addr, ai.ai_addr, ai.ai_addrlen);
816 if (_ioctl(s, SIOCGIFAFLAG_IN6, &ifr6) == 0) {
817 flags6 = ifr6.ifr_ifru.ifru_flags6;
818 if ((flags6 & IN6_IFF_DEPRECATED))
819 aio->aio_srcflag |= AIO_SRCFLAG_DEPRECATED;
830 matchlen(struct sockaddr *src, struct sockaddr *dst)
837 switch (src->sa_family) {
840 s = (u_char *)&((struct sockaddr_in6 *)src)->sin6_addr;
841 d = (u_char *)&((struct sockaddr_in6 *)dst)->sin6_addr;
842 addrlen = sizeof(struct in6_addr);
847 s = (u_char *)&((struct sockaddr_in *)src)->sin_addr;
848 d = (u_char *)&((struct sockaddr_in *)dst)->sin_addr;
849 addrlen = sizeof(struct in_addr);
857 if ((r = (*d++ ^ *s++)) != 0) {
858 while (r < addrlen * 8) {
869 comp_dst(const void *arg1, const void *arg2)
871 const struct ai_order *dst1 = arg1, *dst2 = arg2;
874 * Rule 1: Avoid unusable destinations.
875 * XXX: we currently do not consider if an appropriate route exists.
877 if (dst1->aio_srcsa.sa_family != AF_UNSPEC &&
878 dst2->aio_srcsa.sa_family == AF_UNSPEC) {
881 if (dst1->aio_srcsa.sa_family == AF_UNSPEC &&
882 dst2->aio_srcsa.sa_family != AF_UNSPEC) {
886 /* Rule 2: Prefer matching scope. */
887 if (dst1->aio_dstscope == dst1->aio_srcscope &&
888 dst2->aio_dstscope != dst2->aio_srcscope) {
891 if (dst1->aio_dstscope != dst1->aio_srcscope &&
892 dst2->aio_dstscope == dst2->aio_srcscope) {
896 /* Rule 3: Avoid deprecated addresses. */
897 if (dst1->aio_srcsa.sa_family != AF_UNSPEC &&
898 dst2->aio_srcsa.sa_family != AF_UNSPEC) {
899 if (!(dst1->aio_srcflag & AIO_SRCFLAG_DEPRECATED) &&
900 (dst2->aio_srcflag & AIO_SRCFLAG_DEPRECATED)) {
903 if ((dst1->aio_srcflag & AIO_SRCFLAG_DEPRECATED) &&
904 !(dst2->aio_srcflag & AIO_SRCFLAG_DEPRECATED)) {
909 /* Rule 4: Prefer home addresses. */
910 /* XXX: not implemented yet */
912 /* Rule 5: Prefer matching label. */
914 if (dst1->aio_srcpolicy && dst1->aio_dstpolicy &&
915 dst1->aio_srcpolicy->pc_policy.label ==
916 dst1->aio_dstpolicy->pc_policy.label &&
917 (dst2->aio_srcpolicy == NULL || dst2->aio_dstpolicy == NULL ||
918 dst2->aio_srcpolicy->pc_policy.label !=
919 dst2->aio_dstpolicy->pc_policy.label)) {
922 if (dst2->aio_srcpolicy && dst2->aio_dstpolicy &&
923 dst2->aio_srcpolicy->pc_policy.label ==
924 dst2->aio_dstpolicy->pc_policy.label &&
925 (dst1->aio_srcpolicy == NULL || dst1->aio_dstpolicy == NULL ||
926 dst1->aio_srcpolicy->pc_policy.label !=
927 dst1->aio_dstpolicy->pc_policy.label)) {
932 /* Rule 6: Prefer higher precedence. */
934 if (dst1->aio_dstpolicy &&
935 (dst2->aio_dstpolicy == NULL ||
936 dst1->aio_dstpolicy->pc_policy.preced >
937 dst2->aio_dstpolicy->pc_policy.preced)) {
940 if (dst2->aio_dstpolicy &&
941 (dst1->aio_dstpolicy == NULL ||
942 dst2->aio_dstpolicy->pc_policy.preced >
943 dst1->aio_dstpolicy->pc_policy.preced)) {
948 /* Rule 7: Prefer native transport. */
949 /* XXX: not implemented yet */
951 /* Rule 8: Prefer smaller scope. */
952 if (dst1->aio_dstscope >= 0 &&
953 dst1->aio_dstscope < dst2->aio_dstscope) {
956 if (dst2->aio_dstscope >= 0 &&
957 dst2->aio_dstscope < dst1->aio_dstscope) {
962 * Rule 9: Use longest matching prefix.
963 * We compare the match length in a same AF only.
965 if (dst1->aio_ai->ai_addr->sa_family ==
966 dst2->aio_ai->ai_addr->sa_family) {
967 if (dst1->aio_matchlen > dst2->aio_matchlen) {
970 if (dst1->aio_matchlen < dst2->aio_matchlen) {
975 /* Rule 10: Otherwise, leave the order unchanged. */
981 * XXX: we should standardize the functions and link them as standard
985 gai_addr2scopetype(struct sockaddr *sa)
988 struct sockaddr_in6 *sa6;
990 struct sockaddr_in *sa4;
992 switch(sa->sa_family) {
995 sa6 = (struct sockaddr_in6 *)sa;
996 if (IN6_IS_ADDR_MULTICAST(&sa6->sin6_addr)) {
997 /* just use the scope field of the multicast address */
998 return(sa6->sin6_addr.s6_addr[2] & 0x0f);
1001 * Unicast addresses: map scope type to corresponding scope
1002 * value defined for multcast addresses.
1003 * XXX: hardcoded scope type values are bad...
1005 if (IN6_IS_ADDR_LOOPBACK(&sa6->sin6_addr))
1006 return(1); /* node local scope */
1007 if (IN6_IS_ADDR_LINKLOCAL(&sa6->sin6_addr))
1008 return(2); /* link-local scope */
1009 if (IN6_IS_ADDR_SITELOCAL(&sa6->sin6_addr))
1010 return(5); /* site-local scope */
1011 return(14); /* global scope */
1016 * IPv4 pseudo scoping according to RFC 3484.
1018 sa4 = (struct sockaddr_in *)sa;
1019 /* IPv4 autoconfiguration addresses have link-local scope. */
1020 if (((u_char *)&sa4->sin_addr)[0] == 169 &&
1021 ((u_char *)&sa4->sin_addr)[1] == 254)
1023 /* Private addresses have site-local scope. */
1024 if (((u_char *)&sa4->sin_addr)[0] == 10 ||
1025 (((u_char *)&sa4->sin_addr)[0] == 172 &&
1026 (((u_char *)&sa4->sin_addr)[1] & 0xf0) == 16) ||
1027 (((u_char *)&sa4->sin_addr)[0] == 192 &&
1028 ((u_char *)&sa4->sin_addr)[1] == 168))
1029 return(14); /* XXX: It should be 5 unless NAT */
1030 /* Loopback addresses have link-local scope. */
1031 if (((u_char *)&sa4->sin_addr)[0] == 127)
1036 errno = EAFNOSUPPORT; /* is this a good error? */
1043 * passive socket -> anyaddr (0.0.0.0 or ::)
1044 * non-passive socket -> localhost (127.0.0.1 or ::1)
1047 explore_null(const struct addrinfo *pai, const char *servname,
1048 struct addrinfo **res)
1051 const struct afd *afd;
1052 struct addrinfo *ai;
1059 * filter out AFs that are not supported by the kernel
1062 s = _socket(pai->ai_family, SOCK_DGRAM, 0);
1064 if (errno != EMFILE)
1070 * if the servname does not match socktype/protocol, ignore it.
1072 if (get_portmatch(pai, servname) != 0)
1075 afd = find_afd(pai->ai_family);
1079 if (pai->ai_flags & AI_PASSIVE) {
1080 GET_AI(ai, afd, afd->a_addrany);
1081 GET_PORT(ai, servname);
1083 GET_AI(ai, afd, afd->a_loopback);
1084 GET_PORT(ai, servname);
1100 explore_numeric(const struct addrinfo *pai, const char *hostname,
1101 const char *servname, struct addrinfo **res,
1102 const char *canonname)
1104 const struct afd *afd;
1105 struct addrinfo *ai;
1107 char pton[PTON_MAX];
1113 * if the servname does not match socktype/protocol, ignore it.
1115 if (get_portmatch(pai, servname) != 0)
1118 afd = find_afd(pai->ai_family);
1122 switch (afd->a_af) {
1125 * RFC3493 requires getaddrinfo() to accept AF_INET formats
1126 * that are accepted by inet_addr() and its family. The
1127 * accepted forms includes the "classful" one, which inet_pton
1128 * does not accept. So we need to separate the case for
1131 if (inet_aton(hostname, (struct in_addr *)pton) != 1)
1135 if (inet_pton(afd->a_af, hostname, pton) != 1)
1140 if (pai->ai_family == afd->a_af) {
1141 GET_AI(ai, afd, pton);
1142 GET_PORT(ai, servname);
1143 if ((pai->ai_flags & AI_CANONNAME)) {
1145 * Set the numeric address itself as the canonical
1146 * name, based on a clarification in RFC3493.
1148 GET_CANONNAME(ai, canonname);
1152 * XXX: This should not happen since we already matched the AF
1169 * numeric hostname with scope
1172 explore_numeric_scope(const struct addrinfo *pai, const char *hostname,
1173 const char *servname, struct addrinfo **res)
1175 #if !defined(SCOPE_DELIMITER) || !defined(INET6)
1176 return explore_numeric(pai, hostname, servname, res, hostname);
1178 const struct afd *afd;
1179 struct addrinfo *cur;
1181 char *cp, *hostname2 = NULL, *scope, *addr;
1182 struct sockaddr_in6 *sin6;
1185 * if the servname does not match socktype/protocol, ignore it.
1187 if (get_portmatch(pai, servname) != 0)
1190 afd = find_afd(pai->ai_family);
1195 return explore_numeric(pai, hostname, servname, res, hostname);
1197 cp = strchr(hostname, SCOPE_DELIMITER);
1199 return explore_numeric(pai, hostname, servname, res, hostname);
1202 * Handle special case of <scoped_address><delimiter><scope id>
1204 hostname2 = strdup(hostname);
1205 if (hostname2 == NULL)
1207 /* terminate at the delimiter */
1208 hostname2[cp - hostname] = '\0';
1212 error = explore_numeric(pai, addr, servname, res, hostname);
1216 for (cur = *res; cur; cur = cur->ai_next) {
1217 if (cur->ai_family != AF_INET6)
1219 sin6 = (struct sockaddr_in6 *)(void *)cur->ai_addr;
1220 if (ip6_str2scopeid(scope, sin6, &scopeid) == -1) {
1222 return(EAI_NONAME); /* XXX: is return OK? */
1224 sin6->sin6_scope_id = scopeid;
1235 get_canonname(const struct addrinfo *pai, struct addrinfo *ai, const char *str)
1237 if ((pai->ai_flags & AI_CANONNAME) != 0) {
1238 ai->ai_canonname = strdup(str);
1239 if (ai->ai_canonname == NULL)
1245 static struct addrinfo *
1246 get_ai(const struct addrinfo *pai, const struct afd *afd, const char *addr)
1249 struct addrinfo *ai;
1251 struct in6_addr faith_prefix;
1258 * Transfrom an IPv4 addr into a special IPv6 addr format for
1259 * IPv6->IPv4 translation gateway. (only TCP is supported now)
1261 * +-----------------------------------+------------+
1262 * | faith prefix part (12 bytes) | embedded |
1263 * | | IPv4 addr part (4 bytes)
1264 * +-----------------------------------+------------+
1266 * faith prefix part is specified as ascii IPv6 addr format
1267 * in environmental variable GAI.
1268 * For FAITH to work correctly, routing to faith prefix must be
1269 * setup toward a machine where a FAITH daemon operates.
1270 * Also, the machine must enable some mechanizm
1271 * (e.g. faith interface hack) to divert those packet with
1272 * faith prefixed destination addr to user-land FAITH daemon.
1274 fp_str = getenv("GAI");
1275 if (fp_str && inet_pton(AF_INET6, fp_str, &faith_prefix) == 1 &&
1276 afd->a_af == AF_INET && pai->ai_socktype == SOCK_STREAM) {
1280 memcpy(&v4a, addr, sizeof v4a);
1281 v4a_top = v4a >> IN_CLASSA_NSHIFT;
1282 if (!IN_MULTICAST(v4a) && !IN_EXPERIMENTAL(v4a) &&
1283 v4a_top != 0 && v4a != IN_LOOPBACKNET) {
1284 afd = &afdl[N_INET6];
1285 memcpy(&faith_prefix.s6_addr[12], addr,
1286 sizeof(struct in_addr));
1292 ai = (struct addrinfo *)malloc(sizeof(struct addrinfo)
1293 + (afd->a_socklen));
1297 memcpy(ai, pai, sizeof(struct addrinfo));
1298 ai->ai_addr = (struct sockaddr *)(void *)(ai + 1);
1299 memset(ai->ai_addr, 0, (size_t)afd->a_socklen);
1300 ai->ai_addr->sa_len = afd->a_socklen;
1301 ai->ai_addrlen = afd->a_socklen;
1302 ai->ai_addr->sa_family = ai->ai_family = afd->a_af;
1303 p = (char *)(void *)(ai->ai_addr);
1306 memcpy(p + afd->a_off, &faith_prefix, (size_t)afd->a_addrlen);
1309 memcpy(p + afd->a_off, addr, (size_t)afd->a_addrlen);
1314 get_portmatch(const struct addrinfo *ai, const char *servname)
1317 /* get_port does not touch first argument when matchonly == 1. */
1318 /* LINTED const cast */
1319 return get_port((struct addrinfo *)ai, servname, 1);
1323 get_port(struct addrinfo *ai, const char *servname, int matchonly)
1330 if (servname == NULL)
1332 switch (ai->ai_family) {
1342 switch (ai->ai_socktype) {
1353 return EAI_SOCKTYPE;
1356 error = str2number(servname, &port);
1360 if (port < 0 || port > 65535)
1364 if (ai->ai_flags & AI_NUMERICSERV)
1366 switch (ai->ai_socktype) {
1378 if ((sp = getservbyname(servname, proto)) == NULL)
1384 switch (ai->ai_family) {
1386 ((struct sockaddr_in *)(void *)
1387 ai->ai_addr)->sin_port = port;
1391 ((struct sockaddr_in6 *)(void *)
1392 ai->ai_addr)->sin6_port = port;
1401 static const struct afd *
1404 const struct afd *afd;
1406 if (af == PF_UNSPEC)
1408 for (afd = afdl; afd->a_af; afd++) {
1409 if (afd->a_af == af)
1416 * post-2553: AI_ADDRCONFIG check. if we use getipnodeby* as backend, backend
1417 * will take care of it.
1418 * the semantics of AI_ADDRCONFIG is not defined well. we are not sure
1419 * if the code is right or not.
1421 * XXX PF_UNSPEC -> PF_INET6 + PF_INET mapping needs to be in sync with
1425 addrconfig(struct addrinfo *pai)
1431 * Note that implementation dependent test for address
1432 * configuration should be done everytime called
1433 * (or apropriate interval),
1434 * because addresses will be dynamically assigned or deleted.
1436 af = pai->ai_family;
1437 if (af == AF_UNSPEC) {
1438 if ((s = _socket(AF_INET6, SOCK_DGRAM, 0)) < 0)
1442 if ((s = _socket(AF_INET, SOCK_DGRAM, 0)) < 0)
1448 if (af != AF_UNSPEC) {
1449 if ((s = _socket(af, SOCK_DGRAM, 0)) < 0)
1453 pai->ai_family = af;
1458 /* convert a string to a scope identifier. XXX: IPv6 specific */
1460 ip6_str2scopeid(char *scope, struct sockaddr_in6 *sin6, u_int32_t *scopeid)
1463 struct in6_addr *a6;
1466 a6 = &sin6->sin6_addr;
1468 /* empty scopeid portion is invalid */
1472 if (IN6_IS_ADDR_LINKLOCAL(a6) || IN6_IS_ADDR_MC_LINKLOCAL(a6)) {
1474 * We currently assume a one-to-one mapping between links
1475 * and interfaces, so we simply use interface indices for
1476 * like-local scopes.
1478 *scopeid = if_nametoindex(scope);
1484 /* still unclear about literal, allow numeric only - placeholder */
1485 if (IN6_IS_ADDR_SITELOCAL(a6) || IN6_IS_ADDR_MC_SITELOCAL(a6))
1487 if (IN6_IS_ADDR_MC_ORGLOCAL(a6))
1490 goto trynumeric; /* global */
1492 /* try to convert to a numeric id as a last resort */
1495 lscopeid = strtoul(scope, &ep, 10);
1496 *scopeid = (u_int32_t)(lscopeid & 0xffffffffUL);
1497 if (errno == 0 && ep && *ep == '\0' && *scopeid == lscopeid)
1507 addrinfo_id_func(char *buffer, size_t *buffer_size, va_list ap,
1508 void *cache_mdata __unused)
1513 const int op_id = 0; /* identifies the getaddrinfo for the cache */
1515 struct addrinfo *hints;
1518 int ai_flags, ai_family, ai_socktype, ai_protocol;
1519 size_t desired_size, size;
1521 statp = __res_state();
1522 res_options = statp->options & (RES_RECURSE | RES_DEFNAMES |
1523 RES_DNSRCH | RES_NOALIASES | RES_USE_INET6);
1525 hostname = va_arg(ap, char *);
1526 hints = va_arg(ap, struct addrinfo *);
1528 desired_size = sizeof(res_options) + sizeof(int) + sizeof(int) * 4;
1529 if (hostname != NULL) {
1530 size = strlen(hostname);
1531 desired_size += size + 1;
1535 if (desired_size > *buffer_size) {
1536 *buffer_size = desired_size;
1541 ai_flags = ai_family = ai_socktype = ai_protocol = 0;
1543 ai_flags = hints->ai_flags;
1544 ai_family = hints->ai_family;
1545 ai_socktype = hints->ai_socktype;
1546 ai_protocol = hints->ai_protocol;
1550 memcpy(p, &res_options, sizeof(res_options));
1551 p += sizeof(res_options);
1553 memcpy(p, &op_id, sizeof(int));
1556 memcpy(p, &ai_flags, sizeof(int));
1559 memcpy(p, &ai_family, sizeof(int));
1562 memcpy(p, &ai_socktype, sizeof(int));
1565 memcpy(p, &ai_protocol, sizeof(int));
1568 if (hostname != NULL)
1569 memcpy(p, hostname, size);
1571 *buffer_size = desired_size;
1572 return (NS_SUCCESS);
1576 addrinfo_marshal_func(char *buffer, size_t *buffer_size, void *retval,
1577 va_list ap __unused, void *cache_mdata __unused)
1579 struct addrinfo *ai, *cai;
1581 size_t desired_size, size, ai_size;
1583 ai = *((struct addrinfo **)retval);
1585 desired_size = sizeof(size_t);
1587 for (cai = ai; cai != NULL; cai = cai->ai_next) {
1588 desired_size += sizeof(struct addrinfo) + cai->ai_addrlen;
1589 if (cai->ai_canonname != NULL)
1590 desired_size += sizeof(size_t) +
1591 strlen(cai->ai_canonname);
1595 if (desired_size > *buffer_size) {
1596 /* this assignment is here for future use */
1598 *buffer_size = desired_size;
1602 memset(buffer, 0, desired_size);
1605 memcpy(p, &ai_size, sizeof(size_t));
1606 p += sizeof(size_t);
1607 for (cai = ai; cai != NULL; cai = cai->ai_next) {
1608 memcpy(p, cai, sizeof(struct addrinfo));
1609 p += sizeof(struct addrinfo);
1611 memcpy(p, cai->ai_addr, cai->ai_addrlen);
1612 p += cai->ai_addrlen;
1614 if (cai->ai_canonname != NULL) {
1615 size = strlen(cai->ai_canonname);
1616 memcpy(p, &size, sizeof(size_t));
1617 p += sizeof(size_t);
1619 memcpy(p, cai->ai_canonname, size);
1624 return (NS_SUCCESS);
1628 addrinfo_unmarshal_func(char *buffer, size_t buffer_size __unused, void *retval,
1629 va_list ap __unused, void *cache_mdata __unused)
1631 struct addrinfo new_ai, *result, *sentinel, *lasts;
1634 size_t ai_size, ai_i, size;
1637 memcpy(&ai_size, p, sizeof(size_t));
1638 p += sizeof(size_t);
1642 for (ai_i = 0; ai_i < ai_size; ++ai_i) {
1643 memcpy(&new_ai, p, sizeof(struct addrinfo));
1644 p += sizeof(struct addrinfo);
1645 size = new_ai.ai_addrlen + sizeof(struct addrinfo) +
1648 sentinel = (struct addrinfo *)malloc(size);
1649 memset(sentinel, 0, size);
1651 memcpy(sentinel, &new_ai, sizeof(struct addrinfo));
1652 sentinel->ai_addr = (struct sockaddr *)_ALIGN((char *)sentinel +
1653 sizeof(struct addrinfo));
1655 memcpy(sentinel->ai_addr, p, new_ai.ai_addrlen);
1656 p += new_ai.ai_addrlen;
1658 if (new_ai.ai_canonname != NULL) {
1659 memcpy(&size, p, sizeof(size_t));
1660 p += sizeof(size_t);
1662 sentinel->ai_canonname = (char *)malloc(size + 1);
1663 memset(sentinel->ai_canonname, 0, size + 1);
1665 memcpy(sentinel->ai_canonname, p, size);
1669 if (result == NULL) {
1673 lasts->ai_next = sentinel;
1678 *((struct addrinfo **)retval) = result;
1679 return (NS_SUCCESS);
1681 #endif /* NS_CACHING */
1684 * FQDN hostname, DNS lookup
1687 explore_fqdn(const struct addrinfo *pai, const char *hostname,
1688 const char *servname, struct addrinfo **res)
1690 struct addrinfo *result;
1691 struct addrinfo *cur;
1695 static const nss_cache_info cache_info =
1696 NS_COMMON_CACHE_INFO_INITIALIZER(
1697 hosts, NULL, addrinfo_id_func, addrinfo_marshal_func,
1698 addrinfo_unmarshal_func);
1700 static const ns_dtab dtab[] = {
1701 NS_FILES_CB(_files_getaddrinfo, NULL)
1702 { NSSRC_DNS, _dns_getaddrinfo, NULL }, /* force -DHESIOD */
1703 NS_NIS_CB(_yp_getaddrinfo, NULL)
1705 NS_CACHE_CB(&cache_info)
1713 * if the servname does not match socktype/protocol, ignore it.
1715 if (get_portmatch(pai, servname) != 0)
1718 switch (_nsdispatch(&result, dtab, NSDB_HOSTS, "getaddrinfo",
1719 default_dns_files, hostname, pai)) {
1731 for (cur = result; cur; cur = cur->ai_next) {
1732 GET_PORT(cur, servname);
1733 /* canonname should be filled already */
1744 freeaddrinfo(result);
1749 static const char AskedForGot[] =
1750 "gethostby*.getanswer: asked for \"%s\", got \"%s\"";
1753 static struct addrinfo *
1754 getanswer(const querybuf *answer, int anslen, const char *qname, int qtype,
1755 const struct addrinfo *pai, res_state res)
1757 struct addrinfo sentinel, *cur;
1759 const struct afd *afd;
1766 int type, class, ancount, qdcount;
1767 int haveanswer, had_error;
1768 char tbuf[MAXDNAME];
1769 int (*name_ok)(const char *);
1770 char hostbuf[8*1024];
1772 memset(&sentinel, 0, sizeof(sentinel));
1776 eom = answer->buf + anslen;
1780 case T_ANY: /*use T_ANY only for T_A/T_AAAA lookup*/
1784 return (NULL); /* XXX should be abort(); */
1787 * find first satisfactory answer
1790 ancount = ntohs(hp->ancount);
1791 qdcount = ntohs(hp->qdcount);
1793 ep = hostbuf + sizeof hostbuf;
1794 cp = answer->buf + HFIXEDSZ;
1796 RES_SET_H_ERRNO(res, NO_RECOVERY);
1799 n = dn_expand(answer->buf, eom, cp, bp, ep - bp);
1800 if ((n < 0) || !(*name_ok)(bp)) {
1801 RES_SET_H_ERRNO(res, NO_RECOVERY);
1805 if (qtype == T_A || qtype == T_AAAA || qtype == T_ANY) {
1806 /* res_send() has already verified that the query name is the
1807 * same as the one we sent; this just gets the expanded name
1808 * (i.e., with the succeeding search-domain tacked on).
1810 n = strlen(bp) + 1; /* for the \0 */
1811 if (n >= MAXHOSTNAMELEN) {
1812 RES_SET_H_ERRNO(res, NO_RECOVERY);
1817 /* The qname can be abbreviated, but h_name is now absolute. */
1822 while (ancount-- > 0 && cp < eom && !had_error) {
1823 n = dn_expand(answer->buf, eom, cp, bp, ep - bp);
1824 if ((n < 0) || !(*name_ok)(bp)) {
1829 type = _getshort(cp);
1830 cp += INT16SZ; /* type */
1831 class = _getshort(cp);
1832 cp += INT16SZ + INT32SZ; /* class, TTL */
1834 cp += INT16SZ; /* len */
1835 if (class != C_IN) {
1836 /* XXX - debug? syslog? */
1838 continue; /* XXX - had_error++ ? */
1840 if ((qtype == T_A || qtype == T_AAAA || qtype == T_ANY) &&
1842 n = dn_expand(answer->buf, eom, cp, tbuf, sizeof tbuf);
1843 if ((n < 0) || !(*name_ok)(tbuf)) {
1848 /* Get canonical name. */
1849 n = strlen(tbuf) + 1; /* for the \0 */
1850 if (n > ep - bp || n >= MAXHOSTNAMELEN) {
1854 strlcpy(bp, tbuf, ep - bp);
1859 if (qtype == T_ANY) {
1860 if (!(type == T_A || type == T_AAAA)) {
1864 } else if (type != qtype) {
1866 if (type != T_KEY && type != T_SIG)
1867 syslog(LOG_NOTICE|LOG_AUTH,
1868 "gethostby*.getanswer: asked for \"%s %s %s\", got type \"%s\"",
1869 qname, p_class(C_IN), p_type(qtype),
1873 continue; /* XXX - had_error++ ? */
1878 if (strcasecmp(canonname, bp) != 0) {
1880 syslog(LOG_NOTICE|LOG_AUTH,
1881 AskedForGot, canonname, bp);
1884 continue; /* XXX - had_error++ ? */
1886 if (type == T_A && n != INADDRSZ) {
1890 if (type == T_AAAA && n != IN6ADDRSZ) {
1894 #ifdef FILTER_V4MAPPED
1895 if (type == T_AAAA) {
1896 struct in6_addr in6;
1897 memcpy(&in6, cp, sizeof(in6));
1898 if (IN6_IS_ADDR_V4MAPPED(&in6)) {
1908 nn = strlen(bp) + 1; /* for the \0 */
1912 /* don't overwrite pai */
1914 ai.ai_family = (type == T_A) ? AF_INET : AF_INET6;
1915 afd = find_afd(ai.ai_family);
1920 cur->ai_next = get_ai(&ai, afd, (const char *)cp);
1921 if (cur->ai_next == NULL)
1923 while (cur && cur->ai_next)
1934 #if defined(RESOLVSORT)
1936 * We support only IPv4 address for backward
1937 * compatibility against gethostbyname(3).
1939 if (res->nsort && qtype == T_A) {
1940 if (addr4sort(&sentinel, res) < 0) {
1941 freeaddrinfo(sentinel.ai_next);
1942 RES_SET_H_ERRNO(res, NO_RECOVERY);
1946 #endif /*RESOLVSORT*/
1948 get_canonname(pai, sentinel.ai_next, qname);
1950 get_canonname(pai, sentinel.ai_next, canonname);
1951 RES_SET_H_ERRNO(res, NETDB_SUCCESS);
1952 return sentinel.ai_next;
1955 RES_SET_H_ERRNO(res, NO_RECOVERY);
1961 struct addrinfo *ai;
1966 addr4sort(struct addrinfo *sentinel, res_state res)
1968 struct addrinfo *ai;
1969 struct addr_ptr *addrs, addr;
1970 struct sockaddr_in *sin;
1977 for (ai = sentinel->ai_next; ai; ai = ai->ai_next)
1980 return 0; /* We don't need sorting. */
1981 if ((addrs = malloc(sizeof(struct addr_ptr) * naddrs)) == NULL)
1984 for (ai = sentinel->ai_next; ai; ai = ai->ai_next) {
1985 sin = (struct sockaddr_in *)ai->ai_addr;
1986 for (j = 0; (unsigned)j < res->nsort; j++) {
1987 if (res->sort_list[j].addr.s_addr ==
1988 (sin->sin_addr.s_addr & res->sort_list[j].mask))
1993 if (needsort == 0 && i > 0 && j < addrs[i - 1].aval)
2002 while (needsort < naddrs) {
2003 for (j = needsort - 1; j >= 0; j--) {
2004 if (addrs[j].aval > addrs[j+1].aval) {
2006 addrs[j] = addrs[j + 1];
2007 addrs[j + 1] = addr;
2015 for (i = 0; i < naddrs; ++i) {
2016 ai->ai_next = addrs[i].ai;
2023 #endif /*RESOLVSORT*/
2027 _dns_getaddrinfo(void *rv, void *cb_data __unused, va_list ap)
2029 struct addrinfo *ai;
2030 querybuf *buf, *buf2;
2031 const char *hostname;
2032 const struct addrinfo *pai;
2033 struct addrinfo sentinel, *cur;
2034 struct res_target q, q2;
2037 hostname = va_arg(ap, char *);
2038 pai = va_arg(ap, const struct addrinfo *);
2040 memset(&q, 0, sizeof(q));
2041 memset(&q2, 0, sizeof(q2));
2042 memset(&sentinel, 0, sizeof(sentinel));
2045 buf = malloc(sizeof(*buf));
2047 h_errno = NETDB_INTERNAL;
2050 buf2 = malloc(sizeof(*buf2));
2053 h_errno = NETDB_INTERNAL;
2057 switch (pai->ai_family) {
2062 q.answer = buf->buf;
2063 q.anslen = sizeof(buf->buf);
2068 q2.answer = buf2->buf;
2069 q2.anslen = sizeof(buf2->buf);
2075 q.answer = buf->buf;
2076 q.anslen = sizeof(buf->buf);
2082 q.answer = buf->buf;
2083 q.anslen = sizeof(buf->buf);
2091 res = __res_state();
2092 if ((res->options & RES_INIT) == 0 && res_ninit(res) == -1) {
2093 RES_SET_H_ERRNO(res, NETDB_INTERNAL);
2099 if (res_searchN(hostname, &q, res) < 0) {
2106 ai = getanswer(buf2, q2.n, q2.name, q2.qtype, pai, res);
2109 while (cur && cur->ai_next)
2113 ai = getanswer(buf, q.n, q.name, q.qtype, pai, res);
2118 if (sentinel.ai_next == NULL)
2119 switch (res->res_h_errno) {
2120 case HOST_NOT_FOUND:
2127 *((struct addrinfo **)rv) = sentinel.ai_next;
2132 _sethtent(FILE **hostf)
2135 *hostf = fopen(_PATH_HOSTS, "r");
2141 _endhtent(FILE **hostf)
2149 static struct addrinfo *
2150 _gethtent(FILE **hostf, const char *name, const struct addrinfo *pai)
2153 char *cp, *tname, *cname;
2154 struct addrinfo hints, *res0, *res;
2157 char hostbuf[8*1024];
2159 if (!*hostf && !(*hostf = fopen(_PATH_HOSTS, "r")))
2162 if (!(p = fgets(hostbuf, sizeof hostbuf, *hostf)))
2166 cp = strpbrk(p, "#\n");
2169 if (!(cp = strpbrk(p, " \t")))
2174 /* if this is not something we're looking for, skip it. */
2176 if (*cp == ' ' || *cp == '\t') {
2183 if ((cp = strpbrk(cp, " \t")) != NULL)
2185 if (strcasecmp(name, tname) == 0)
2191 /* we should not glob socktype/protocol here */
2192 memset(&hints, 0, sizeof(hints));
2193 hints.ai_family = pai->ai_family;
2194 hints.ai_socktype = SOCK_DGRAM;
2195 hints.ai_protocol = 0;
2196 hints.ai_flags = AI_NUMERICHOST;
2197 error = getaddrinfo(addr, "0", &hints, &res0);
2200 #ifdef FILTER_V4MAPPED
2201 /* XXX should check all items in the chain */
2202 if (res0->ai_family == AF_INET6 &&
2203 IN6_IS_ADDR_V4MAPPED(&((struct sockaddr_in6 *)res0->ai_addr)->sin6_addr)) {
2208 for (res = res0; res; res = res->ai_next) {
2210 res->ai_flags = pai->ai_flags;
2211 res->ai_socktype = pai->ai_socktype;
2212 res->ai_protocol = pai->ai_protocol;
2214 if (pai->ai_flags & AI_CANONNAME) {
2215 if (get_canonname(pai, res, cname) != 0) {
2226 _files_getaddrinfo(void *rv, void *cb_data __unused, va_list ap)
2229 const struct addrinfo *pai;
2230 struct addrinfo sentinel, *cur;
2234 name = va_arg(ap, char *);
2235 pai = va_arg(ap, struct addrinfo *);
2237 memset(&sentinel, 0, sizeof(sentinel));
2241 while ((p = _gethtent(&hostf, name, pai)) != NULL) {
2243 while (cur && cur->ai_next)
2248 *((struct addrinfo **)rv) = sentinel.ai_next;
2249 if (sentinel.ai_next == NULL)
2256 static struct addrinfo *
2257 _yphostent(char *line, const struct addrinfo *pai)
2259 struct addrinfo sentinel, *cur;
2260 struct addrinfo hints, *res, *res0;
2263 const char *addr, *canonname;
2267 addr = canonname = NULL;
2269 memset(&sentinel, 0, sizeof(sentinel));
2273 /* terminate line */
2274 cp = strchr(p, '\n');
2281 cp = strpbrk(p, " \t");
2283 if (canonname == NULL)
2293 if (*cp == ' ' || *cp == '\t') {
2299 if ((cp = strpbrk(cp, " \t")) != NULL)
2304 hints.ai_flags = AI_NUMERICHOST;
2305 error = getaddrinfo(addr, NULL, &hints, &res0);
2307 for (res = res0; res; res = res->ai_next) {
2309 res->ai_flags = pai->ai_flags;
2311 if (pai->ai_flags & AI_CANONNAME)
2312 get_canonname(pai, res, canonname);
2317 cur->ai_next = res0;
2318 while (cur && cur->ai_next)
2328 return sentinel.ai_next;
2333 _yp_getaddrinfo(void *rv, void *cb_data __unused, va_list ap)
2335 struct addrinfo sentinel, *cur;
2336 struct addrinfo *ai = NULL;
2340 const struct addrinfo *pai;
2343 if (_yp_check(&ypdomain) == 0)
2346 name = va_arg(ap, char *);
2347 pai = va_arg(ap, const struct addrinfo *);
2349 memset(&sentinel, 0, sizeof(sentinel));
2352 /* hosts.byname is only for IPv4 (Solaris8) */
2353 if (pai->ai_family == PF_UNSPEC || pai->ai_family == PF_INET) {
2354 r = yp_match(ypdomain, "hosts.byname", name,
2355 (int)strlen(name), &ypbuf, &ypbuflen);
2357 struct addrinfo ai4;
2360 ai4.ai_family = AF_INET;
2361 ai = _yphostent(ypbuf, &ai4);
2364 while (cur && cur->ai_next)
2371 /* ipnodes.byname can hold both IPv4/v6 */
2372 r = yp_match(ypdomain, "ipnodes.byname", name,
2373 (int)strlen(name), &ypbuf, &ypbuflen);
2375 ai = _yphostent(ypbuf, pai);
2381 if (sentinel.ai_next == NULL) {
2382 RES_SET_H_ERRNO(__res_state(), HOST_NOT_FOUND);
2385 *((struct addrinfo **)rv) = sentinel.ai_next;
2390 /* resolver logic */
2393 * Formulate a normal query, send, and await answer.
2394 * Returned answer is placed in supplied buffer "answer".
2395 * Perform preliminary check of answer, returning success only
2396 * if no error is indicated and the answer count is nonzero.
2397 * Return the size of the response on success, -1 on error.
2398 * Error number is left in h_errno.
2400 * Caller must parse answer and determine whether it answers the question.
2403 res_queryN(const char *name, struct res_target *target, res_state res)
2409 struct res_target *t;
2416 buf = malloc(MAXPACKET);
2418 RES_SET_H_ERRNO(res, NETDB_INTERNAL);
2422 for (t = target; t; t = t->next) {
2427 hp = (HEADER *)(void *)t->answer;
2429 /* make it easier... */
2435 oflags = res->_flags;
2438 hp->rcode = NOERROR; /* default */
2441 if (res->options & RES_DEBUG)
2442 printf(";; res_query(%s, %d, %d)\n", name, class, type);
2445 n = res_nmkquery(res, QUERY, name, class, type, NULL, 0, NULL,
2447 if (n > 0 && (res->_flags & RES_F_EDNS0ERR) == 0 &&
2448 (res->options & (RES_USE_EDNS0|RES_USE_DNSSEC)) != 0U)
2449 n = res_nopt(res, n, buf, MAXPACKET, anslen);
2452 if (res->options & RES_DEBUG)
2453 printf(";; res_query: mkquery failed\n");
2456 RES_SET_H_ERRNO(res, NO_RECOVERY);
2459 n = res_nsend(res, buf, n, answer, anslen);
2462 * if the query choked with EDNS0, retry
2465 if ((res->options & (RES_USE_EDNS0|RES_USE_DNSSEC))
2467 ((oflags ^ res->_flags) & RES_F_EDNS0ERR) != 0) {
2468 res->_flags |= RES_F_EDNS0ERR;
2469 if (res->options & RES_DEBUG)
2470 printf(";; res_nquery: retry without EDNS0\n");
2473 rcode = hp->rcode; /* record most recent error */
2475 if (res->options & RES_DEBUG)
2476 printf(";; res_query: send error\n");
2482 hp->rcode = FORMERR; /* XXX not very informative */
2483 if (hp->rcode != NOERROR || ntohs(hp->ancount) == 0) {
2484 rcode = hp->rcode; /* record most recent error */
2486 if (res->options & RES_DEBUG)
2487 printf(";; rcode = %u, ancount=%u\n", hp->rcode,
2488 ntohs(hp->ancount));
2493 ancount += ntohs(hp->ancount);
2503 RES_SET_H_ERRNO(res, HOST_NOT_FOUND);
2506 RES_SET_H_ERRNO(res, TRY_AGAIN);
2509 RES_SET_H_ERRNO(res, NO_DATA);
2515 RES_SET_H_ERRNO(res, NO_RECOVERY);
2524 * Formulate a normal query, send, and retrieve answer in supplied buffer.
2525 * Return the size of the response on success, -1 on error.
2526 * If enabled, implement search rules until answer or unrecoverable failure
2527 * is detected. Error code, if any, is left in h_errno.
2530 res_searchN(const char *name, struct res_target *target, res_state res)
2532 const char *cp, * const *domain;
2533 HEADER *hp = (HEADER *)(void *)target->answer; /*XXX*/
2535 int trailing_dot, ret, saved_herrno;
2536 int got_nodata = 0, got_servfail = 0, root_on_list = 0;
2537 int tried_as_is = 0;
2539 char abuf[MAXDNAME];
2542 RES_SET_H_ERRNO(res, HOST_NOT_FOUND); /* default, if we never query */
2544 for (cp = name; *cp; cp++)
2545 dots += (*cp == '.');
2547 if (cp > name && *--cp == '.')
2551 * if there aren't any dots, it could be a user-level alias
2554 (cp = res_hostalias(res, name, abuf, sizeof(abuf))) != NULL)
2555 return (res_queryN(cp, target, res));
2558 * If there are enough dots in the name, let's just give it a
2559 * try 'as is'. The threshold can be set with the "ndots" option.
2560 * Also, query 'as is', if there is a trailing dot in the name.
2563 if (dots >= res->ndots || trailing_dot) {
2564 ret = res_querydomainN(name, NULL, target, res);
2565 if (ret > 0 || trailing_dot)
2567 if (errno == ECONNREFUSED) {
2568 RES_SET_H_ERRNO(res, TRY_AGAIN);
2571 switch (res->res_h_errno) {
2573 case HOST_NOT_FOUND:
2576 if (hp->rcode == SERVFAIL)
2582 saved_herrno = res->res_h_errno;
2587 * We do at least one level of search if
2588 * - there is no dot and RES_DEFNAME is set, or
2589 * - there is at least one dot, there is no trailing dot,
2590 * and RES_DNSRCH is set.
2592 if ((!dots && (res->options & RES_DEFNAMES)) ||
2593 (dots && !trailing_dot && (res->options & RES_DNSRCH))) {
2596 for (domain = (const char * const *)res->dnsrch;
2601 if (domain[0][0] == '\0' ||
2602 (domain[0][0] == '.' && domain[0][1] == '\0'))
2605 if (root_on_list && tried_as_is)
2608 ret = res_querydomainN(name, *domain, target, res);
2613 * If no server present, give up.
2614 * If name isn't found in this domain,
2615 * keep trying higher domains in the search list
2616 * (if that's enabled).
2617 * On a NO_DATA error, keep trying, otherwise
2618 * a wildcard entry of another type could keep us
2619 * from finding this entry higher in the domain.
2620 * If we get some other error (negative answer or
2621 * server failure), then stop searching up,
2622 * but try the input name below in case it's
2625 if (errno == ECONNREFUSED) {
2626 RES_SET_H_ERRNO(res, TRY_AGAIN);
2630 switch (res->res_h_errno) {
2634 case HOST_NOT_FOUND:
2639 if (hp->rcode == SERVFAIL) {
2640 /* try next search element, if any */
2645 /* anything else implies that we're done */
2649 * if we got here for some reason other than DNSRCH,
2650 * we only wanted one iteration of the loop, so stop.
2652 if (!(res->options & RES_DNSRCH))
2657 switch (res->res_h_errno) {
2659 case HOST_NOT_FOUND:
2662 if (hp->rcode == SERVFAIL)
2670 * If the query has not already been tried as is then try it
2671 * unless RES_NOTLDQUERY is set and there were no dots.
2673 if ((dots || !searched || !(res->options & RES_NOTLDQUERY)) &&
2674 !(tried_as_is || root_on_list)) {
2675 ret = res_querydomainN(name, NULL, target, res);
2681 * if we got here, we didn't satisfy the search.
2682 * if we did an initial full query, return that query's h_errno
2683 * (note that we wouldn't be here if that query had succeeded).
2684 * else if we ever got a nodata, send that back as the reason.
2685 * else send back meaningless h_errno, that being the one from
2686 * the last DNSRCH we did.
2689 if (saved_herrno != -1)
2690 RES_SET_H_ERRNO(res, saved_herrno);
2691 else if (got_nodata)
2692 RES_SET_H_ERRNO(res, NO_DATA);
2693 else if (got_servfail)
2694 RES_SET_H_ERRNO(res, TRY_AGAIN);
2699 * Perform a call on res_query on the concatenation of name and domain,
2700 * removing a trailing dot from name if domain is NULL.
2703 res_querydomainN(const char *name, const char *domain,
2704 struct res_target *target, res_state res)
2706 char nbuf[MAXDNAME];
2707 const char *longname = nbuf;
2711 if (res->options & RES_DEBUG)
2712 printf(";; res_querydomain(%s, %s)\n",
2713 name, domain?domain:"<Nil>");
2715 if (domain == NULL) {
2717 * Check for trailing '.';
2718 * copy without '.' if present.
2721 if (n >= MAXDNAME) {
2722 RES_SET_H_ERRNO(res, NO_RECOVERY);
2725 if (n > 0 && name[--n] == '.') {
2726 strncpy(nbuf, name, n);
2733 if (n + d + 1 >= MAXDNAME) {
2734 RES_SET_H_ERRNO(res, NO_RECOVERY);
2737 snprintf(nbuf, sizeof(nbuf), "%s.%s", name, domain);
2739 return (res_queryN(longname, target, res));