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 <sys/queue.h>
67 #include <net/if_var.h>
68 #include <sys/sysctl.h>
69 #include <sys/ioctl.h>
70 #include <netinet6/in6_var.h> /* XXX */
72 #include <arpa/inet.h>
73 #include <arpa/nameser.h>
75 #include <rpcsvc/yp_prot.h>
76 #include <rpcsvc/ypclnt.h>
87 #include "res_config.h"
95 #include "un-namespace.h"
96 #include "libc_private.h"
101 #if defined(__KAME__) && defined(INET6)
109 static const char in_addrany[] = { 0, 0, 0, 0 };
110 static const char in_loopback[] = { 127, 0, 0, 1 };
112 static const char in6_addrany[] = {
113 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
115 static const char in6_loopback[] = {
116 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1
121 TAILQ_ENTRY(policyqueue) pc_entry;
123 struct in6_addrpolicy pc_policy;
126 TAILQ_HEAD(policyhead, policyqueue);
128 static const struct afd {
133 const char *a_addrany;
134 const char *a_loopback;
139 {PF_INET6, sizeof(struct in6_addr),
140 sizeof(struct sockaddr_in6),
141 offsetof(struct sockaddr_in6, sin6_addr),
142 in6_addrany, in6_loopback, 1},
147 {PF_INET, sizeof(struct in_addr),
148 sizeof(struct sockaddr_in),
149 offsetof(struct sockaddr_in, sin_addr),
150 in_addrany, in_loopback, 0},
151 {0, 0, 0, 0, NULL, NULL, 0},
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, ANY, ANY, 0x01 },
169 { PF_INET6, SOCK_DGRAM, IPPROTO_UDP, 0x07 },
170 { PF_INET6, SOCK_STREAM, IPPROTO_TCP, 0x07 },
171 { PF_INET6, SOCK_STREAM, IPPROTO_SCTP, 0x03 },
172 { PF_INET6, SOCK_SEQPACKET, IPPROTO_SCTP, 0x07 },
173 { PF_INET6, SOCK_RAW, ANY, 0x05 },
175 { PF_INET, SOCK_DGRAM, IPPROTO_UDP, 0x07 },
176 { PF_INET, SOCK_STREAM, IPPROTO_TCP, 0x07 },
177 { PF_INET, SOCK_STREAM, IPPROTO_SCTP, 0x03 },
178 { PF_INET, SOCK_SEQPACKET, IPPROTO_SCTP, 0x07 },
179 { PF_INET, SOCK_RAW, ANY, 0x05 },
189 #define AIO_SRCFLAG_DEPRECATED 0x1
193 struct sockaddr_storage aiou_ss;
194 struct sockaddr aiou_sa;
196 #define aio_srcsa aio_src_un.aiou_sa
197 u_int32_t aio_srcflag;
200 struct policyqueue *aio_srcpolicy;
201 struct policyqueue *aio_dstpolicy;
202 struct addrinfo *aio_ai;
206 static const ns_src default_dns_files[] = {
207 { NSSRC_FILES, NS_SUCCESS },
208 { NSSRC_DNS, NS_SUCCESS },
213 struct res_target *next;
214 const char *name; /* domain name */
215 int qclass, qtype; /* class and type of query */
216 u_char *answer; /* buffer to put answer */
217 int anslen; /* size of answer buffer */
218 int n; /* result length */
221 #define MAXPACKET (64*1024)
225 u_char buf[MAXPACKET];
228 static int str2number(const char *, int *);
229 static int explore_copy(const struct addrinfo *, const struct addrinfo *,
231 static int explore_null(const struct addrinfo *,
232 const char *, struct addrinfo **);
233 static int explore_numeric(const struct addrinfo *, const char *,
234 const char *, struct addrinfo **, const char *);
235 static int explore_numeric_scope(const struct addrinfo *, const char *,
236 const char *, struct addrinfo **);
237 static int get_canonname(const struct addrinfo *,
238 struct addrinfo *, const char *);
239 static struct addrinfo *get_ai(const struct addrinfo *,
240 const struct afd *, const char *);
241 static struct addrinfo *copy_ai(const struct addrinfo *);
242 static int get_portmatch(const struct addrinfo *, const char *);
243 static int get_port(struct addrinfo *, const char *, int);
244 static const struct afd *find_afd(int);
245 static int addrconfig(struct addrinfo *);
246 static void set_source(struct ai_order *, struct policyhead *);
247 static int comp_dst(const void *, const void *);
249 static int ip6_str2scopeid(char *, struct sockaddr_in6 *, u_int32_t *);
251 static int gai_addr2scopetype(struct sockaddr *);
253 static int explore_fqdn(const struct addrinfo *, const char *,
254 const char *, struct addrinfo **);
256 static int reorder(struct addrinfo *);
257 static int get_addrselectpolicy(struct policyhead *);
258 static void free_addrselectpolicy(struct policyhead *);
259 static struct policyqueue *match_addrselectpolicy(struct sockaddr *,
260 struct policyhead *);
261 static int matchlen(struct sockaddr *, struct sockaddr *);
263 static struct addrinfo *getanswer(const querybuf *, int, const char *, int,
264 const struct addrinfo *, res_state);
265 #if defined(RESOLVSORT)
266 static int addr4sort(struct addrinfo *, res_state);
268 static int _dns_getaddrinfo(void *, void *, va_list);
269 static void _sethtent(FILE **);
270 static void _endhtent(FILE **);
271 static struct addrinfo *_gethtent(FILE **, const char *,
272 const struct addrinfo *);
273 static int _files_getaddrinfo(void *, void *, va_list);
275 static struct addrinfo *_yphostent(char *, const struct addrinfo *);
276 static int _yp_getaddrinfo(void *, void *, va_list);
279 static int addrinfo_id_func(char *, size_t *, va_list, void *);
280 static int addrinfo_marshal_func(char *, size_t *, void *, va_list, void *);
281 static int addrinfo_unmarshal_func(char *, size_t, void *, va_list, void *);
284 static int res_queryN(const char *, struct res_target *, res_state);
285 static int res_searchN(const char *, struct res_target *, res_state);
286 static int res_querydomainN(const char *, const char *,
287 struct res_target *, res_state);
289 /* XXX macros that make external reference is BAD. */
291 #define GET_AI(ai, afd, addr) \
293 /* external reference: pai, error, and label free */ \
294 (ai) = get_ai(pai, (afd), (addr)); \
295 if ((ai) == NULL) { \
296 error = EAI_MEMORY; \
299 } while (/*CONSTCOND*/0)
301 #define GET_PORT(ai, serv) \
303 /* external reference: error and label free */ \
304 error = get_port((ai), (serv), 0); \
307 } while (/*CONSTCOND*/0)
309 #define GET_CANONNAME(ai, str) \
311 /* external reference: pai, error and label free */ \
312 error = get_canonname(pai, (ai), (str)); \
315 } while (/*CONSTCOND*/0)
319 /* external reference: error, and label bad */ \
323 } while (/*CONSTCOND*/0)
325 #define MATCH_FAMILY(x, y, w) \
326 ((x) == (y) || (/*CONSTCOND*/(w) && ((x) == PF_UNSPEC || (y) == PF_UNSPEC)))
327 #define MATCH(x, y, w) \
328 ((x) == (y) || (/*CONSTCOND*/(w) && ((x) == ANY || (y) == ANY)))
331 freeaddrinfo(struct addrinfo *ai)
333 struct addrinfo *next;
337 if (ai->ai_canonname)
338 free(ai->ai_canonname);
339 /* no need to free(ai->ai_addr) */
346 str2number(const char *p, int *portp)
355 v = strtoul(p, &ep, 10);
356 if (errno == 0 && ep && *ep == '\0' && v <= UINT_MAX) {
364 getaddrinfo(const char *hostname, const char *servname,
365 const struct addrinfo *hints, struct addrinfo **res)
367 struct addrinfo sentinel;
368 struct addrinfo *cur;
370 struct addrinfo ai, ai0, *afai;
371 struct addrinfo *pai;
372 const struct afd *afd;
373 const struct explore *ex;
374 struct addrinfo *afailist[sizeof(afdl)/sizeof(afdl[0])];
375 struct addrinfo *afai_unspec;
379 /* ensure we return NULL on errors */
382 memset(&ai, 0, sizeof(ai));
384 memset(afailist, 0, sizeof(afailist));
387 memset(&sentinel, 0, sizeof(sentinel));
391 pai->ai_family = PF_UNSPEC;
392 pai->ai_socktype = ANY;
393 pai->ai_protocol = ANY;
395 pai->ai_canonname = NULL;
399 if (hostname == NULL && servname == NULL)
402 /* error check for hints */
403 if (hints->ai_addrlen || hints->ai_canonname ||
404 hints->ai_addr || hints->ai_next)
405 ERR(EAI_BADHINTS); /* xxx */
406 if (hints->ai_flags & ~AI_MASK)
408 switch (hints->ai_family) {
418 memcpy(pai, hints, sizeof(*pai));
421 * if both socktype/protocol are specified, check if they
422 * are meaningful combination.
424 if (pai->ai_socktype != ANY && pai->ai_protocol != ANY) {
425 for (ex = explore; ex->e_af >= 0; ex++) {
426 if (!MATCH_FAMILY(pai->ai_family, ex->e_af,
429 if (!MATCH(pai->ai_socktype, ex->e_socktype,
432 if (!MATCH(pai->ai_protocol, ex->e_protocol,
446 * check for special cases. (1) numeric servname is disallowed if
447 * socktype/protocol are left unspecified. (2) servname is disallowed
448 * for raw and other inet{,6} sockets.
450 if (MATCH_FAMILY(pai->ai_family, PF_INET, 1)
452 || MATCH_FAMILY(pai->ai_family, PF_INET6, 1)
455 ai0 = *pai; /* backup *pai */
457 if (pai->ai_family == PF_UNSPEC) {
459 pai->ai_family = PF_INET6;
461 pai->ai_family = PF_INET;
464 error = get_portmatch(pai, servname);
474 * NULL hostname, or numeric hostname.
475 * If numeric representation of AF1 can be interpreted as FQDN
476 * representation of AF2, we need to think again about the code below.
479 for (afd = afdl; afd->a_af; afd++) {
482 if (!MATCH_FAMILY(pai->ai_family, afd->a_af, 1))
485 if (pai->ai_family == PF_UNSPEC)
486 pai->ai_family = afd->a_af;
488 if (hostname == NULL) {
489 error = explore_null(pai, servname,
490 &afailist[afd - afdl]);
493 * Errors from explore_null should be unexpected and
494 * be caught to avoid returning an incomplete result.
499 error = explore_numeric_scope(pai, hostname, servname,
500 &afailist[afd - afdl]);
503 * explore_numeric_scope returns an error for address
504 * families that do not match that of hostname.
505 * Thus we should not catch the error at this moment.
509 if (!error && afailist[afd - afdl])
517 if (hostname == NULL)
518 ERR(EAI_NONAME); /* used to be EAI_NODATA */
519 if (pai->ai_flags & AI_NUMERICHOST)
522 if ((pai->ai_flags & AI_ADDRCONFIG) != 0 && !addrconfig(&ai0))
526 * hostname as alphabetical name.
529 error = explore_fqdn(pai, hostname, servname, &afai_unspec);
532 for (ex = explore; ex->e_af >= 0; ex++) {
535 if (!MATCH_FAMILY(pai->ai_family, ex->e_af, WILD_AF(ex)))
537 if (!MATCH(pai->ai_socktype, ex->e_socktype,
540 if (!MATCH(pai->ai_protocol, ex->e_protocol,
544 if (pai->ai_family == PF_UNSPEC)
545 pai->ai_family = ex->e_af;
546 if (pai->ai_socktype == ANY && ex->e_socktype != ANY)
547 pai->ai_socktype = ex->e_socktype;
548 if (pai->ai_protocol == ANY && ex->e_protocol != ANY)
549 pai->ai_protocol = ex->e_protocol;
552 * if the servname does not match socktype/protocol, ignore it.
554 if (get_portmatch(pai, servname) != 0)
560 if ((afd = find_afd(pai->ai_family)) == NULL)
562 /* XXX assumes that afd points inside afdl[] */
563 afai = afailist[afd - afdl];
568 error = explore_copy(pai, afai, &cur->ai_next);
572 while (cur && cur->ai_next)
577 * ensure we return either:
578 * - error == 0, non-NULL *res
579 * - error != 0, NULL *res
582 if (sentinel.ai_next) {
584 * If the returned entry is for an active connection,
585 * and the given name is not numeric, reorder the
586 * list, so that the application would try the list
587 * in the most efficient order. Since the head entry
588 * of the original list may contain ai_canonname and
589 * that entry may be moved elsewhere in the new list,
590 * we keep the pointer and will restore it in the new
591 * head entry. (Note that RFC3493 requires the head
592 * entry store it when requested by the caller).
594 if (hints == NULL || !(hints->ai_flags & AI_PASSIVE)) {
599 sentinel.ai_next->ai_canonname;
600 sentinel.ai_next->ai_canonname = NULL;
601 (void)reorder(&sentinel);
602 if (sentinel.ai_next->ai_canonname ==
604 sentinel.ai_next->ai_canonname
606 } else if (canonname != NULL)
610 *res = sentinel.ai_next;
617 freeaddrinfo(afai_unspec);
618 for (afd = afdl; afd->a_af; afd++) {
619 if (afailist[afd - afdl])
620 freeaddrinfo(afailist[afd - afdl]);
623 if (sentinel.ai_next)
624 freeaddrinfo(sentinel.ai_next);
630 reorder(struct addrinfo *sentinel)
632 struct addrinfo *ai, **aip;
633 struct ai_order *aio;
635 struct policyhead policyhead;
637 /* count the number of addrinfo elements for sorting. */
638 for (n = 0, ai = sentinel->ai_next; ai != NULL; ai = ai->ai_next, n++)
642 * If the number is small enough, we can skip the reordering process.
647 /* allocate a temporary array for sort and initialization of it. */
648 if ((aio = malloc(sizeof(*aio) * n)) == NULL)
649 return(n); /* give up reordering */
650 memset(aio, 0, sizeof(*aio) * n);
652 /* retrieve address selection policy from the kernel */
653 TAILQ_INIT(&policyhead);
654 if (!get_addrselectpolicy(&policyhead)) {
655 /* no policy is installed into kernel, we don't sort. */
660 for (i = 0, ai = sentinel->ai_next; i < n; ai = ai->ai_next, i++) {
662 aio[i].aio_dstscope = gai_addr2scopetype(ai->ai_addr);
663 aio[i].aio_dstpolicy = match_addrselectpolicy(ai->ai_addr,
665 set_source(&aio[i], &policyhead);
668 /* perform sorting. */
669 qsort(aio, n, sizeof(*aio), comp_dst);
671 /* reorder the addrinfo chain. */
672 for (i = 0, aip = &sentinel->ai_next; i < n; i++) {
673 *aip = aio[i].aio_ai;
674 aip = &aio[i].aio_ai->ai_next;
678 /* cleanup and return */
680 free_addrselectpolicy(&policyhead);
685 get_addrselectpolicy(struct policyhead *head)
688 int mib[] = { CTL_NET, PF_INET6, IPPROTO_IPV6, IPV6CTL_ADDRCTLPOLICY };
691 struct in6_addrpolicy *pol, *ep;
693 if (sysctl(mib, sizeof(mib) / sizeof(mib[0]), NULL, &l, NULL, 0) < 0)
697 if ((buf = malloc(l)) == NULL)
699 if (sysctl(mib, sizeof(mib) / sizeof(mib[0]), buf, &l, NULL, 0) < 0) {
704 ep = (struct in6_addrpolicy *)(buf + l);
705 for (pol = (struct in6_addrpolicy *)buf; pol + 1 <= ep; pol++) {
706 struct policyqueue *new;
708 if ((new = malloc(sizeof(*new))) == NULL) {
709 free_addrselectpolicy(head); /* make the list empty */
712 new->pc_policy = *pol;
713 TAILQ_INSERT_TAIL(head, new, pc_entry);
724 free_addrselectpolicy(struct policyhead *head)
726 struct policyqueue *ent, *nent;
728 for (ent = TAILQ_FIRST(head); ent; ent = nent) {
729 nent = TAILQ_NEXT(ent, pc_entry);
730 TAILQ_REMOVE(head, ent, pc_entry);
735 static struct policyqueue *
736 match_addrselectpolicy(struct sockaddr *addr, struct policyhead *head)
739 struct policyqueue *ent, *bestent = NULL;
740 struct in6_addrpolicy *pol;
741 int matchlen, bestmatchlen = -1;
742 u_char *mp, *ep, *k, *p, m;
743 struct sockaddr_in6 key;
745 switch(addr->sa_family) {
747 key = *(struct sockaddr_in6 *)addr;
750 /* convert the address into IPv4-mapped IPv6 address. */
751 memset(&key, 0, sizeof(key));
752 key.sin6_family = AF_INET6;
753 key.sin6_len = sizeof(key);
754 key.sin6_addr.s6_addr[10] = 0xff;
755 key.sin6_addr.s6_addr[11] = 0xff;
756 memcpy(&key.sin6_addr.s6_addr[12],
757 &((struct sockaddr_in *)addr)->sin_addr, 4);
763 for (ent = TAILQ_FIRST(head); ent; ent = TAILQ_NEXT(ent, pc_entry)) {
764 pol = &ent->pc_policy;
767 mp = (u_char *)&pol->addrmask.sin6_addr;
768 ep = mp + 16; /* XXX: scope field? */
769 k = (u_char *)&key.sin6_addr;
770 p = (u_char *)&pol->addr.sin6_addr;
771 for (; mp < ep && *mp; mp++, k++, p++) {
774 goto next; /* not match */
775 if (m == 0xff) /* short cut for a typical case */
785 /* matched. check if this is better than the current best. */
786 if (matchlen > bestmatchlen) {
788 bestmatchlen = matchlen;
803 set_source(struct ai_order *aio, struct policyhead *ph)
805 struct addrinfo ai = *aio->aio_ai;
806 struct sockaddr_storage ss;
810 /* set unspec ("no source is available"), just in case */
811 aio->aio_srcsa.sa_family = AF_UNSPEC;
812 aio->aio_srcscope = -1;
814 switch(ai.ai_family) {
820 default: /* ignore unsupported AFs explicitly */
824 /* XXX: make a dummy addrinfo to call connect() */
825 ai.ai_socktype = SOCK_DGRAM;
826 ai.ai_protocol = IPPROTO_UDP; /* is UDP too specific? */
828 memset(&ss, 0, sizeof(ss));
829 memcpy(&ss, ai.ai_addr, ai.ai_addrlen);
830 ai.ai_addr = (struct sockaddr *)&ss;
831 get_port(&ai, "1", 0);
833 /* open a socket to get the source address for the given dst */
834 if ((s = _socket(ai.ai_family, ai.ai_socktype | SOCK_CLOEXEC,
835 ai.ai_protocol)) < 0)
836 return; /* give up */
837 if (_connect(s, ai.ai_addr, ai.ai_addrlen) < 0)
839 srclen = ai.ai_addrlen;
840 if (_getsockname(s, &aio->aio_srcsa, &srclen) < 0) {
841 aio->aio_srcsa.sa_family = AF_UNSPEC;
844 aio->aio_srcscope = gai_addr2scopetype(&aio->aio_srcsa);
845 aio->aio_srcpolicy = match_addrselectpolicy(&aio->aio_srcsa, ph);
846 aio->aio_matchlen = matchlen(&aio->aio_srcsa, aio->aio_ai->ai_addr);
848 if (ai.ai_family == AF_INET6) {
849 struct in6_ifreq ifr6;
852 memset(&ifr6, 0, sizeof(ifr6));
853 memcpy(&ifr6.ifr_addr, ai.ai_addr, ai.ai_addrlen);
854 if (_ioctl(s, SIOCGIFAFLAG_IN6, &ifr6) == 0) {
855 flags6 = ifr6.ifr_ifru.ifru_flags6;
856 if ((flags6 & IN6_IFF_DEPRECATED))
857 aio->aio_srcflag |= AIO_SRCFLAG_DEPRECATED;
868 matchlen(struct sockaddr *src, struct sockaddr *dst)
875 switch (src->sa_family) {
878 s = (u_char *)&((struct sockaddr_in6 *)src)->sin6_addr;
879 d = (u_char *)&((struct sockaddr_in6 *)dst)->sin6_addr;
880 addrlen = sizeof(struct in6_addr);
885 s = (u_char *)&((struct sockaddr_in *)src)->sin_addr;
886 d = (u_char *)&((struct sockaddr_in *)dst)->sin_addr;
887 addrlen = sizeof(struct in_addr);
895 if ((r = (*d++ ^ *s++)) != 0) {
896 while (r < addrlen * 8) {
907 comp_dst(const void *arg1, const void *arg2)
909 const struct ai_order *dst1 = arg1, *dst2 = arg2;
912 * Rule 1: Avoid unusable destinations.
913 * XXX: we currently do not consider if an appropriate route exists.
915 if (dst1->aio_srcsa.sa_family != AF_UNSPEC &&
916 dst2->aio_srcsa.sa_family == AF_UNSPEC) {
919 if (dst1->aio_srcsa.sa_family == AF_UNSPEC &&
920 dst2->aio_srcsa.sa_family != AF_UNSPEC) {
924 /* Rule 2: Prefer matching scope. */
925 if (dst1->aio_dstscope == dst1->aio_srcscope &&
926 dst2->aio_dstscope != dst2->aio_srcscope) {
929 if (dst1->aio_dstscope != dst1->aio_srcscope &&
930 dst2->aio_dstscope == dst2->aio_srcscope) {
934 /* Rule 3: Avoid deprecated addresses. */
935 if (dst1->aio_srcsa.sa_family != AF_UNSPEC &&
936 dst2->aio_srcsa.sa_family != AF_UNSPEC) {
937 if (!(dst1->aio_srcflag & AIO_SRCFLAG_DEPRECATED) &&
938 (dst2->aio_srcflag & AIO_SRCFLAG_DEPRECATED)) {
941 if ((dst1->aio_srcflag & AIO_SRCFLAG_DEPRECATED) &&
942 !(dst2->aio_srcflag & AIO_SRCFLAG_DEPRECATED)) {
947 /* Rule 4: Prefer home addresses. */
948 /* XXX: not implemented yet */
950 /* Rule 5: Prefer matching label. */
952 if (dst1->aio_srcpolicy && dst1->aio_dstpolicy &&
953 dst1->aio_srcpolicy->pc_policy.label ==
954 dst1->aio_dstpolicy->pc_policy.label &&
955 (dst2->aio_srcpolicy == NULL || dst2->aio_dstpolicy == NULL ||
956 dst2->aio_srcpolicy->pc_policy.label !=
957 dst2->aio_dstpolicy->pc_policy.label)) {
960 if (dst2->aio_srcpolicy && dst2->aio_dstpolicy &&
961 dst2->aio_srcpolicy->pc_policy.label ==
962 dst2->aio_dstpolicy->pc_policy.label &&
963 (dst1->aio_srcpolicy == NULL || dst1->aio_dstpolicy == NULL ||
964 dst1->aio_srcpolicy->pc_policy.label !=
965 dst1->aio_dstpolicy->pc_policy.label)) {
970 /* Rule 6: Prefer higher precedence. */
972 if (dst1->aio_dstpolicy &&
973 (dst2->aio_dstpolicy == NULL ||
974 dst1->aio_dstpolicy->pc_policy.preced >
975 dst2->aio_dstpolicy->pc_policy.preced)) {
978 if (dst2->aio_dstpolicy &&
979 (dst1->aio_dstpolicy == NULL ||
980 dst2->aio_dstpolicy->pc_policy.preced >
981 dst1->aio_dstpolicy->pc_policy.preced)) {
986 /* Rule 7: Prefer native transport. */
987 /* XXX: not implemented yet */
989 /* Rule 8: Prefer smaller scope. */
990 if (dst1->aio_dstscope >= 0 &&
991 dst1->aio_dstscope < dst2->aio_dstscope) {
994 if (dst2->aio_dstscope >= 0 &&
995 dst2->aio_dstscope < dst1->aio_dstscope) {
1000 * Rule 9: Use longest matching prefix.
1001 * We compare the match length in a same AF only.
1003 if (dst1->aio_ai->ai_addr->sa_family ==
1004 dst2->aio_ai->ai_addr->sa_family) {
1005 if (dst1->aio_matchlen > dst2->aio_matchlen) {
1008 if (dst1->aio_matchlen < dst2->aio_matchlen) {
1013 /* Rule 10: Otherwise, leave the order unchanged. */
1018 * Copy from scope.c.
1019 * XXX: we should standardize the functions and link them as standard
1023 gai_addr2scopetype(struct sockaddr *sa)
1026 struct sockaddr_in6 *sa6;
1028 struct sockaddr_in *sa4;
1030 switch(sa->sa_family) {
1033 sa6 = (struct sockaddr_in6 *)sa;
1034 if (IN6_IS_ADDR_MULTICAST(&sa6->sin6_addr)) {
1035 /* just use the scope field of the multicast address */
1036 return(sa6->sin6_addr.s6_addr[2] & 0x0f);
1039 * Unicast addresses: map scope type to corresponding scope
1040 * value defined for multcast addresses.
1041 * XXX: hardcoded scope type values are bad...
1043 if (IN6_IS_ADDR_LOOPBACK(&sa6->sin6_addr))
1044 return(1); /* node local scope */
1045 if (IN6_IS_ADDR_LINKLOCAL(&sa6->sin6_addr))
1046 return(2); /* link-local scope */
1047 if (IN6_IS_ADDR_SITELOCAL(&sa6->sin6_addr))
1048 return(5); /* site-local scope */
1049 return(14); /* global scope */
1054 * IPv4 pseudo scoping according to RFC 3484.
1056 sa4 = (struct sockaddr_in *)sa;
1057 /* IPv4 autoconfiguration addresses have link-local scope. */
1058 if (((u_char *)&sa4->sin_addr)[0] == 169 &&
1059 ((u_char *)&sa4->sin_addr)[1] == 254)
1061 /* Private addresses have site-local scope. */
1062 if (((u_char *)&sa4->sin_addr)[0] == 10 ||
1063 (((u_char *)&sa4->sin_addr)[0] == 172 &&
1064 (((u_char *)&sa4->sin_addr)[1] & 0xf0) == 16) ||
1065 (((u_char *)&sa4->sin_addr)[0] == 192 &&
1066 ((u_char *)&sa4->sin_addr)[1] == 168))
1067 return(14); /* XXX: It should be 5 unless NAT */
1068 /* Loopback addresses have link-local scope. */
1069 if (((u_char *)&sa4->sin_addr)[0] == 127)
1074 errno = EAFNOSUPPORT; /* is this a good error? */
1080 explore_copy(const struct addrinfo *pai, const struct addrinfo *src0,
1081 struct addrinfo **res)
1084 struct addrinfo sentinel, *cur;
1085 const struct addrinfo *src;
1088 sentinel.ai_next = NULL;
1091 for (src = src0; src != NULL; src = src->ai_next) {
1092 if (src->ai_family != pai->ai_family)
1095 cur->ai_next = copy_ai(src);
1096 if (!cur->ai_next) {
1101 cur->ai_next->ai_socktype = pai->ai_socktype;
1102 cur->ai_next->ai_protocol = pai->ai_protocol;
1106 *res = sentinel.ai_next;
1110 freeaddrinfo(sentinel.ai_next);
1116 * passive socket -> anyaddr (0.0.0.0 or ::)
1117 * non-passive socket -> localhost (127.0.0.1 or ::1)
1120 explore_null(const struct addrinfo *pai, const char *servname,
1121 struct addrinfo **res)
1124 const struct afd *afd;
1125 struct addrinfo *ai;
1132 * filter out AFs that are not supported by the kernel
1135 s = _socket(pai->ai_family, SOCK_DGRAM | SOCK_CLOEXEC, 0);
1137 if (errno != EMFILE)
1142 afd = find_afd(pai->ai_family);
1146 if (pai->ai_flags & AI_PASSIVE) {
1147 GET_AI(ai, afd, afd->a_addrany);
1148 GET_PORT(ai, servname);
1150 GET_AI(ai, afd, afd->a_loopback);
1151 GET_PORT(ai, servname);
1167 explore_numeric(const struct addrinfo *pai, const char *hostname,
1168 const char *servname, struct addrinfo **res, const char *canonname)
1170 const struct afd *afd;
1171 struct addrinfo *ai;
1173 char pton[PTON_MAX];
1178 afd = find_afd(pai->ai_family);
1182 switch (afd->a_af) {
1185 * RFC3493 requires getaddrinfo() to accept AF_INET formats
1186 * that are accepted by inet_addr() and its family. The
1187 * accepted forms includes the "classful" one, which inet_pton
1188 * does not accept. So we need to separate the case for
1191 if (inet_aton(hostname, (struct in_addr *)pton) != 1)
1195 if (inet_pton(afd->a_af, hostname, pton) != 1)
1200 if (pai->ai_family == afd->a_af) {
1201 GET_AI(ai, afd, pton);
1202 GET_PORT(ai, servname);
1203 if ((pai->ai_flags & AI_CANONNAME)) {
1205 * Set the numeric address itself as the canonical
1206 * name, based on a clarification in RFC3493.
1208 GET_CANONNAME(ai, canonname);
1212 * XXX: This should not happen since we already matched the AF
1229 * numeric hostname with scope
1232 explore_numeric_scope(const struct addrinfo *pai, const char *hostname,
1233 const char *servname, struct addrinfo **res)
1235 #if !defined(SCOPE_DELIMITER) || !defined(INET6)
1236 return explore_numeric(pai, hostname, servname, res, hostname);
1238 const struct afd *afd;
1239 struct addrinfo *cur;
1241 char *cp, *hostname2 = NULL, *scope, *addr;
1242 struct sockaddr_in6 *sin6;
1244 afd = find_afd(pai->ai_family);
1249 return explore_numeric(pai, hostname, servname, res, hostname);
1251 cp = strchr(hostname, SCOPE_DELIMITER);
1253 return explore_numeric(pai, hostname, servname, res, hostname);
1256 * Handle special case of <scoped_address><delimiter><scope id>
1258 hostname2 = strdup(hostname);
1259 if (hostname2 == NULL)
1261 /* terminate at the delimiter */
1262 hostname2[cp - hostname] = '\0';
1266 error = explore_numeric(pai, addr, servname, res, hostname);
1270 for (cur = *res; cur; cur = cur->ai_next) {
1271 if (cur->ai_family != AF_INET6)
1273 sin6 = (struct sockaddr_in6 *)(void *)cur->ai_addr;
1274 if (ip6_str2scopeid(scope, sin6, &scopeid) == -1) {
1278 return(EAI_NONAME); /* XXX: is return OK? */
1280 sin6->sin6_scope_id = scopeid;
1286 if (error && *res) {
1295 get_canonname(const struct addrinfo *pai, struct addrinfo *ai, const char *str)
1297 if ((pai->ai_flags & AI_CANONNAME) != 0) {
1298 ai->ai_canonname = strdup(str);
1299 if (ai->ai_canonname == NULL)
1305 static struct addrinfo *
1306 get_ai(const struct addrinfo *pai, const struct afd *afd, const char *addr)
1309 struct addrinfo *ai;
1311 struct in6_addr faith_prefix;
1318 * Transfrom an IPv4 addr into a special IPv6 addr format for
1319 * IPv6->IPv4 translation gateway. (only TCP is supported now)
1321 * +-----------------------------------+------------+
1322 * | faith prefix part (12 bytes) | embedded |
1323 * | | IPv4 addr part (4 bytes)
1324 * +-----------------------------------+------------+
1326 * faith prefix part is specified as ascii IPv6 addr format
1327 * in environmental variable GAI.
1328 * For FAITH to work correctly, routing to faith prefix must be
1329 * setup toward a machine where a FAITH daemon operates.
1330 * Also, the machine must enable some mechanizm
1331 * (e.g. faith interface hack) to divert those packet with
1332 * faith prefixed destination addr to user-land FAITH daemon.
1334 fp_str = getenv("GAI");
1335 if (fp_str && inet_pton(AF_INET6, fp_str, &faith_prefix) == 1 &&
1336 afd->a_af == AF_INET && pai->ai_socktype == SOCK_STREAM) {
1340 memcpy(&v4a, addr, sizeof v4a);
1341 v4a_top = v4a >> IN_CLASSA_NSHIFT;
1342 if (!IN_MULTICAST(v4a) && !IN_EXPERIMENTAL(v4a) &&
1343 v4a_top != 0 && v4a != IN_LOOPBACKNET) {
1344 afd = &afdl[N_INET6];
1345 memcpy(&faith_prefix.s6_addr[12], addr,
1346 sizeof(struct in_addr));
1352 ai = (struct addrinfo *)malloc(sizeof(struct addrinfo)
1353 + (afd->a_socklen));
1357 memcpy(ai, pai, sizeof(struct addrinfo));
1358 ai->ai_addr = (struct sockaddr *)(void *)(ai + 1);
1359 memset(ai->ai_addr, 0, (size_t)afd->a_socklen);
1360 ai->ai_addr->sa_len = afd->a_socklen;
1361 ai->ai_addrlen = afd->a_socklen;
1362 ai->ai_addr->sa_family = ai->ai_family = afd->a_af;
1363 p = (char *)(void *)(ai->ai_addr);
1366 memcpy(p + afd->a_off, &faith_prefix, (size_t)afd->a_addrlen);
1369 memcpy(p + afd->a_off, addr, (size_t)afd->a_addrlen);
1373 /* XXX need to malloc() the same way we do from other functions! */
1374 static struct addrinfo *
1375 copy_ai(const struct addrinfo *pai)
1377 struct addrinfo *ai;
1380 l = sizeof(*ai) + pai->ai_addrlen;
1381 if ((ai = (struct addrinfo *)malloc(l)) == NULL)
1384 memcpy(ai, pai, sizeof(*ai));
1385 ai->ai_addr = (struct sockaddr *)(void *)(ai + 1);
1386 memcpy(ai->ai_addr, pai->ai_addr, pai->ai_addrlen);
1388 if (pai->ai_canonname) {
1389 l = strlen(pai->ai_canonname) + 1;
1390 if ((ai->ai_canonname = malloc(l)) == NULL) {
1394 strlcpy(ai->ai_canonname, pai->ai_canonname, l);
1396 /* just to make sure */
1397 ai->ai_canonname = NULL;
1406 get_portmatch(const struct addrinfo *ai, const char *servname)
1409 /* get_port does not touch first argument when matchonly == 1. */
1410 /* LINTED const cast */
1411 return get_port((struct addrinfo *)ai, servname, 1);
1415 get_port(struct addrinfo *ai, const char *servname, int matchonly)
1422 if (servname == NULL)
1424 switch (ai->ai_family) {
1434 switch (ai->ai_socktype) {
1439 case SOCK_SEQPACKET:
1443 switch (ai->ai_family) {
1456 return EAI_SOCKTYPE;
1459 error = str2number(servname, &port);
1463 if (port < 0 || port > 65535)
1467 if (ai->ai_flags & AI_NUMERICSERV)
1470 switch (ai->ai_protocol) {
1485 if ((sp = getservbyname(servname, proto)) == NULL)
1491 switch (ai->ai_family) {
1493 ((struct sockaddr_in *)(void *)
1494 ai->ai_addr)->sin_port = port;
1498 ((struct sockaddr_in6 *)(void *)
1499 ai->ai_addr)->sin6_port = port;
1508 static const struct afd *
1511 const struct afd *afd;
1513 if (af == PF_UNSPEC)
1515 for (afd = afdl; afd->a_af; afd++) {
1516 if (afd->a_af == af)
1523 * post-2553: AI_ADDRCONFIG check. if we use getipnodeby* as backend, backend
1524 * will take care of it.
1525 * the semantics of AI_ADDRCONFIG is not defined well. we are not sure
1526 * if the code is right or not.
1528 * XXX PF_UNSPEC -> PF_INET6 + PF_INET mapping needs to be in sync with
1532 addrconfig(struct addrinfo *pai)
1538 * Note that implementation dependent test for address
1539 * configuration should be done everytime called
1540 * (or apropriate interval),
1541 * because addresses will be dynamically assigned or deleted.
1543 af = pai->ai_family;
1544 if (af == AF_UNSPEC) {
1545 if ((s = _socket(AF_INET6, SOCK_DGRAM | SOCK_CLOEXEC, 0)) < 0)
1549 if ((s = _socket(AF_INET, SOCK_DGRAM | SOCK_CLOEXEC,
1556 if (af != AF_UNSPEC) {
1557 if ((s = _socket(af, SOCK_DGRAM | SOCK_CLOEXEC, 0)) < 0)
1561 pai->ai_family = af;
1566 /* convert a string to a scope identifier. XXX: IPv6 specific */
1568 ip6_str2scopeid(char *scope, struct sockaddr_in6 *sin6, u_int32_t *scopeid)
1571 struct in6_addr *a6;
1574 a6 = &sin6->sin6_addr;
1576 /* empty scopeid portion is invalid */
1580 if (IN6_IS_ADDR_LINKLOCAL(a6) || IN6_IS_ADDR_MC_LINKLOCAL(a6) ||
1581 IN6_IS_ADDR_MC_NODELOCAL(a6)) {
1583 * We currently assume a one-to-one mapping between links
1584 * and interfaces, so we simply use interface indices for
1585 * like-local scopes.
1587 *scopeid = if_nametoindex(scope);
1593 /* still unclear about literal, allow numeric only - placeholder */
1594 if (IN6_IS_ADDR_SITELOCAL(a6) || IN6_IS_ADDR_MC_SITELOCAL(a6))
1596 if (IN6_IS_ADDR_MC_ORGLOCAL(a6))
1599 goto trynumeric; /* global */
1601 /* try to convert to a numeric id as a last resort */
1604 lscopeid = strtoul(scope, &ep, 10);
1605 *scopeid = (u_int32_t)(lscopeid & 0xffffffffUL);
1606 if (errno == 0 && ep && *ep == '\0' && *scopeid == lscopeid)
1616 addrinfo_id_func(char *buffer, size_t *buffer_size, va_list ap,
1622 const int op_id = 0; /* identifies the getaddrinfo for the cache */
1624 struct addrinfo *hints;
1627 int ai_flags, ai_family, ai_socktype, ai_protocol;
1628 size_t desired_size, size;
1630 statp = __res_state();
1631 res_options = statp->options & (RES_RECURSE | RES_DEFNAMES |
1632 RES_DNSRCH | RES_NOALIASES | RES_USE_INET6);
1634 hostname = va_arg(ap, char *);
1635 hints = va_arg(ap, struct addrinfo *);
1637 desired_size = sizeof(res_options) + sizeof(int) + sizeof(int) * 4;
1638 if (hostname != NULL) {
1639 size = strlen(hostname);
1640 desired_size += size + 1;
1644 if (desired_size > *buffer_size) {
1645 *buffer_size = desired_size;
1650 ai_flags = ai_family = ai_socktype = ai_protocol = 0;
1652 ai_flags = hints->ai_flags;
1653 ai_family = hints->ai_family;
1654 ai_socktype = hints->ai_socktype;
1655 ai_protocol = hints->ai_protocol;
1659 memcpy(p, &res_options, sizeof(res_options));
1660 p += sizeof(res_options);
1662 memcpy(p, &op_id, sizeof(int));
1665 memcpy(p, &ai_flags, sizeof(int));
1668 memcpy(p, &ai_family, sizeof(int));
1671 memcpy(p, &ai_socktype, sizeof(int));
1674 memcpy(p, &ai_protocol, sizeof(int));
1677 if (hostname != NULL)
1678 memcpy(p, hostname, size);
1680 *buffer_size = desired_size;
1681 return (NS_SUCCESS);
1685 addrinfo_marshal_func(char *buffer, size_t *buffer_size, void *retval,
1686 va_list ap, void *cache_mdata)
1688 struct addrinfo *ai, *cai;
1690 size_t desired_size, size, ai_size;
1692 ai = *((struct addrinfo **)retval);
1694 desired_size = sizeof(size_t);
1696 for (cai = ai; cai != NULL; cai = cai->ai_next) {
1697 desired_size += sizeof(struct addrinfo) + cai->ai_addrlen;
1698 if (cai->ai_canonname != NULL)
1699 desired_size += sizeof(size_t) +
1700 strlen(cai->ai_canonname);
1704 if (desired_size > *buffer_size) {
1705 /* this assignment is here for future use */
1707 *buffer_size = desired_size;
1711 memset(buffer, 0, desired_size);
1714 memcpy(p, &ai_size, sizeof(size_t));
1715 p += sizeof(size_t);
1716 for (cai = ai; cai != NULL; cai = cai->ai_next) {
1717 memcpy(p, cai, sizeof(struct addrinfo));
1718 p += sizeof(struct addrinfo);
1720 memcpy(p, cai->ai_addr, cai->ai_addrlen);
1721 p += cai->ai_addrlen;
1723 if (cai->ai_canonname != NULL) {
1724 size = strlen(cai->ai_canonname);
1725 memcpy(p, &size, sizeof(size_t));
1726 p += sizeof(size_t);
1728 memcpy(p, cai->ai_canonname, size);
1733 return (NS_SUCCESS);
1737 addrinfo_unmarshal_func(char *buffer, size_t buffer_size, void *retval,
1738 va_list ap, void *cache_mdata)
1740 struct addrinfo new_ai, *result, *sentinel, *lasts;
1743 size_t ai_size, ai_i, size;
1746 memcpy(&ai_size, p, sizeof(size_t));
1747 p += sizeof(size_t);
1751 for (ai_i = 0; ai_i < ai_size; ++ai_i) {
1752 memcpy(&new_ai, p, sizeof(struct addrinfo));
1753 p += sizeof(struct addrinfo);
1754 size = new_ai.ai_addrlen + sizeof(struct addrinfo) +
1757 sentinel = (struct addrinfo *)malloc(size);
1758 memset(sentinel, 0, size);
1760 memcpy(sentinel, &new_ai, sizeof(struct addrinfo));
1761 sentinel->ai_addr = (struct sockaddr *)_ALIGN((char *)sentinel +
1762 sizeof(struct addrinfo));
1764 memcpy(sentinel->ai_addr, p, new_ai.ai_addrlen);
1765 p += new_ai.ai_addrlen;
1767 if (new_ai.ai_canonname != NULL) {
1768 memcpy(&size, p, sizeof(size_t));
1769 p += sizeof(size_t);
1771 sentinel->ai_canonname = (char *)malloc(size + 1);
1772 memset(sentinel->ai_canonname, 0, size + 1);
1774 memcpy(sentinel->ai_canonname, p, size);
1778 if (result == NULL) {
1782 lasts->ai_next = sentinel;
1787 *((struct addrinfo **)retval) = result;
1788 return (NS_SUCCESS);
1790 #endif /* NS_CACHING */
1793 * FQDN hostname, DNS lookup
1796 explore_fqdn(const struct addrinfo *pai, const char *hostname,
1797 const char *servname, struct addrinfo **res)
1799 struct addrinfo *result;
1800 struct addrinfo *cur;
1804 static const nss_cache_info cache_info =
1805 NS_COMMON_CACHE_INFO_INITIALIZER(
1806 hosts, NULL, addrinfo_id_func, addrinfo_marshal_func,
1807 addrinfo_unmarshal_func);
1809 static const ns_dtab dtab[] = {
1810 NS_FILES_CB(_files_getaddrinfo, NULL)
1811 { NSSRC_DNS, _dns_getaddrinfo, NULL }, /* force -DHESIOD */
1812 NS_NIS_CB(_yp_getaddrinfo, NULL)
1814 NS_CACHE_CB(&cache_info)
1822 * if the servname does not match socktype/protocol, ignore it.
1824 if (get_portmatch(pai, servname) != 0)
1827 switch (_nsdispatch(&result, dtab, NSDB_HOSTS, "getaddrinfo",
1828 default_dns_files, hostname, pai)) {
1840 for (cur = result; cur; cur = cur->ai_next) {
1841 GET_PORT(cur, servname);
1842 /* canonname should be filled already */
1853 freeaddrinfo(result);
1858 static const char AskedForGot[] =
1859 "gethostby*.getanswer: asked for \"%s\", got \"%s\"";
1862 static struct addrinfo *
1863 getanswer(const querybuf *answer, int anslen, const char *qname, int qtype,
1864 const struct addrinfo *pai, res_state res)
1866 struct addrinfo sentinel, *cur;
1868 const struct afd *afd;
1875 int type, class, ancount, qdcount;
1876 int haveanswer, had_error;
1877 char tbuf[MAXDNAME];
1878 int (*name_ok)(const char *);
1879 char hostbuf[8*1024];
1881 memset(&sentinel, 0, sizeof(sentinel));
1885 eom = answer->buf + anslen;
1889 case T_ANY: /*use T_ANY only for T_A/T_AAAA lookup*/
1893 return (NULL); /* XXX should be abort(); */
1896 * find first satisfactory answer
1899 ancount = ntohs(hp->ancount);
1900 qdcount = ntohs(hp->qdcount);
1902 ep = hostbuf + sizeof hostbuf;
1903 cp = answer->buf + HFIXEDSZ;
1905 RES_SET_H_ERRNO(res, NO_RECOVERY);
1908 n = dn_expand(answer->buf, eom, cp, bp, ep - bp);
1909 if ((n < 0) || !(*name_ok)(bp)) {
1910 RES_SET_H_ERRNO(res, NO_RECOVERY);
1914 if (qtype == T_A || qtype == T_AAAA || qtype == T_ANY) {
1915 /* res_send() has already verified that the query name is the
1916 * same as the one we sent; this just gets the expanded name
1917 * (i.e., with the succeeding search-domain tacked on).
1919 n = strlen(bp) + 1; /* for the \0 */
1920 if (n >= MAXHOSTNAMELEN) {
1921 RES_SET_H_ERRNO(res, NO_RECOVERY);
1926 /* The qname can be abbreviated, but h_name is now absolute. */
1931 while (ancount-- > 0 && cp < eom && !had_error) {
1932 n = dn_expand(answer->buf, eom, cp, bp, ep - bp);
1933 if ((n < 0) || !(*name_ok)(bp)) {
1938 type = _getshort(cp);
1939 cp += INT16SZ; /* type */
1940 class = _getshort(cp);
1941 cp += INT16SZ + INT32SZ; /* class, TTL */
1943 cp += INT16SZ; /* len */
1944 if (class != C_IN) {
1945 /* XXX - debug? syslog? */
1947 continue; /* XXX - had_error++ ? */
1949 if ((qtype == T_A || qtype == T_AAAA || qtype == T_ANY) &&
1951 n = dn_expand(answer->buf, eom, cp, tbuf, sizeof tbuf);
1952 if ((n < 0) || !(*name_ok)(tbuf)) {
1957 /* Get canonical name. */
1958 n = strlen(tbuf) + 1; /* for the \0 */
1959 if (n > ep - bp || n >= MAXHOSTNAMELEN) {
1963 strlcpy(bp, tbuf, ep - bp);
1968 if (qtype == T_ANY) {
1969 if (!(type == T_A || type == T_AAAA)) {
1973 } else if (type != qtype) {
1975 if (type != T_KEY && type != T_SIG &&
1977 syslog(LOG_NOTICE|LOG_AUTH,
1978 "gethostby*.getanswer: asked for \"%s %s %s\", got type \"%s\"",
1979 qname, p_class(C_IN), p_type(qtype),
1983 continue; /* XXX - had_error++ ? */
1988 if (strcasecmp(canonname, bp) != 0) {
1990 syslog(LOG_NOTICE|LOG_AUTH,
1991 AskedForGot, canonname, bp);
1994 continue; /* XXX - had_error++ ? */
1996 if (type == T_A && n != INADDRSZ) {
2000 if (type == T_AAAA && n != IN6ADDRSZ) {
2004 #ifdef FILTER_V4MAPPED
2005 if (type == T_AAAA) {
2006 struct in6_addr in6;
2007 memcpy(&in6, cp, sizeof(in6));
2008 if (IN6_IS_ADDR_V4MAPPED(&in6)) {
2018 nn = strlen(bp) + 1; /* for the \0 */
2022 /* don't overwrite pai */
2024 ai.ai_family = (type == T_A) ? AF_INET : AF_INET6;
2025 afd = find_afd(ai.ai_family);
2030 cur->ai_next = get_ai(&ai, afd, (const char *)cp);
2031 if (cur->ai_next == NULL)
2033 while (cur && cur->ai_next)
2044 #if defined(RESOLVSORT)
2046 * We support only IPv4 address for backward
2047 * compatibility against gethostbyname(3).
2049 if (res->nsort && qtype == T_A) {
2050 if (addr4sort(&sentinel, res) < 0) {
2051 freeaddrinfo(sentinel.ai_next);
2052 RES_SET_H_ERRNO(res, NO_RECOVERY);
2056 #endif /*RESOLVSORT*/
2058 (void)get_canonname(pai, sentinel.ai_next, qname);
2060 (void)get_canonname(pai, sentinel.ai_next, canonname);
2061 RES_SET_H_ERRNO(res, NETDB_SUCCESS);
2062 return sentinel.ai_next;
2065 RES_SET_H_ERRNO(res, NO_RECOVERY);
2071 struct addrinfo *ai;
2076 addr4sort(struct addrinfo *sentinel, res_state res)
2078 struct addrinfo *ai;
2079 struct addr_ptr *addrs, addr;
2080 struct sockaddr_in *sin;
2087 for (ai = sentinel->ai_next; ai; ai = ai->ai_next)
2090 return 0; /* We don't need sorting. */
2091 if ((addrs = malloc(sizeof(struct addr_ptr) * naddrs)) == NULL)
2094 for (ai = sentinel->ai_next; ai; ai = ai->ai_next) {
2095 sin = (struct sockaddr_in *)ai->ai_addr;
2096 for (j = 0; (unsigned)j < res->nsort; j++) {
2097 if (res->sort_list[j].addr.s_addr ==
2098 (sin->sin_addr.s_addr & res->sort_list[j].mask))
2103 if (needsort == 0 && i > 0 && j < addrs[i - 1].aval)
2112 while (needsort < naddrs) {
2113 for (j = needsort - 1; j >= 0; j--) {
2114 if (addrs[j].aval > addrs[j+1].aval) {
2116 addrs[j] = addrs[j + 1];
2117 addrs[j + 1] = addr;
2125 for (i = 0; i < naddrs; ++i) {
2126 ai->ai_next = addrs[i].ai;
2133 #endif /*RESOLVSORT*/
2137 _dns_getaddrinfo(void *rv, void *cb_data, va_list ap)
2139 struct addrinfo *ai;
2140 querybuf *buf, *buf2;
2141 const char *hostname;
2142 const struct addrinfo *pai;
2143 struct addrinfo sentinel, *cur;
2144 struct res_target q, q2;
2147 hostname = va_arg(ap, char *);
2148 pai = va_arg(ap, const struct addrinfo *);
2150 memset(&q, 0, sizeof(q));
2151 memset(&q2, 0, sizeof(q2));
2152 memset(&sentinel, 0, sizeof(sentinel));
2155 buf = malloc(sizeof(*buf));
2157 RES_SET_H_ERRNO(res, NETDB_INTERNAL);
2160 buf2 = malloc(sizeof(*buf2));
2163 RES_SET_H_ERRNO(res, NETDB_INTERNAL);
2167 switch (pai->ai_family) {
2172 q.answer = buf->buf;
2173 q.anslen = sizeof(buf->buf);
2178 q2.answer = buf2->buf;
2179 q2.anslen = sizeof(buf2->buf);
2185 q.answer = buf->buf;
2186 q.anslen = sizeof(buf->buf);
2192 q.answer = buf->buf;
2193 q.anslen = sizeof(buf->buf);
2201 res = __res_state();
2202 if ((res->options & RES_INIT) == 0 && res_ninit(res) == -1) {
2203 RES_SET_H_ERRNO(res, NETDB_INTERNAL);
2209 if (res_searchN(hostname, &q, res) < 0) {
2216 ai = getanswer(buf2, q2.n, q2.name, q2.qtype, pai, res);
2219 while (cur && cur->ai_next)
2223 ai = getanswer(buf, q.n, q.name, q.qtype, pai, res);
2228 if (sentinel.ai_next == NULL)
2229 switch (res->res_h_errno) {
2230 case HOST_NOT_FOUND:
2237 *((struct addrinfo **)rv) = sentinel.ai_next;
2242 _sethtent(FILE **hostf)
2245 *hostf = fopen(_PATH_HOSTS, "re");
2251 _endhtent(FILE **hostf)
2254 (void) fclose(*hostf);
2259 static struct addrinfo *
2260 _gethtent(FILE **hostf, const char *name, const struct addrinfo *pai)
2263 char *cp, *tname, *cname;
2264 struct addrinfo hints, *res0, *res;
2267 char hostbuf[8*1024];
2269 if (!*hostf && !(*hostf = fopen(_PATH_HOSTS, "re")))
2272 if (!(p = fgets(hostbuf, sizeof hostbuf, *hostf)))
2276 cp = strpbrk(p, "#\n");
2279 if (!(cp = strpbrk(p, " \t")))
2284 /* if this is not something we're looking for, skip it. */
2286 if (*cp == ' ' || *cp == '\t') {
2293 if ((cp = strpbrk(cp, " \t")) != NULL)
2295 if (strcasecmp(name, tname) == 0)
2301 /* we should not glob socktype/protocol here */
2302 memset(&hints, 0, sizeof(hints));
2303 hints.ai_family = pai->ai_family;
2304 hints.ai_socktype = SOCK_DGRAM;
2305 hints.ai_protocol = 0;
2306 hints.ai_flags = AI_NUMERICHOST;
2307 error = getaddrinfo(addr, "0", &hints, &res0);
2310 #ifdef FILTER_V4MAPPED
2311 /* XXX should check all items in the chain */
2312 if (res0->ai_family == AF_INET6 &&
2313 IN6_IS_ADDR_V4MAPPED(&((struct sockaddr_in6 *)res0->ai_addr)->sin6_addr)) {
2318 for (res = res0; res; res = res->ai_next) {
2320 res->ai_flags = pai->ai_flags;
2321 res->ai_socktype = pai->ai_socktype;
2322 res->ai_protocol = pai->ai_protocol;
2324 if (pai->ai_flags & AI_CANONNAME) {
2325 if (get_canonname(pai, res, cname) != 0) {
2336 _files_getaddrinfo(void *rv, void *cb_data, va_list ap)
2339 const struct addrinfo *pai;
2340 struct addrinfo sentinel, *cur;
2344 name = va_arg(ap, char *);
2345 pai = va_arg(ap, struct addrinfo *);
2347 memset(&sentinel, 0, sizeof(sentinel));
2351 while ((p = _gethtent(&hostf, name, pai)) != NULL) {
2353 while (cur && cur->ai_next)
2358 *((struct addrinfo **)rv) = sentinel.ai_next;
2359 if (sentinel.ai_next == NULL)
2366 static struct addrinfo *
2367 _yphostent(char *line, const struct addrinfo *pai)
2369 struct addrinfo sentinel, *cur;
2370 struct addrinfo hints, *res, *res0;
2373 const char *addr, *canonname;
2377 addr = canonname = NULL;
2379 memset(&sentinel, 0, sizeof(sentinel));
2383 /* terminate line */
2384 cp = strchr(p, '\n');
2391 cp = strpbrk(p, " \t");
2393 if (canonname == NULL)
2403 if (*cp == ' ' || *cp == '\t') {
2409 if ((cp = strpbrk(cp, " \t")) != NULL)
2414 hints.ai_flags = AI_NUMERICHOST;
2415 error = getaddrinfo(addr, NULL, &hints, &res0);
2417 for (res = res0; res; res = res->ai_next) {
2419 res->ai_flags = pai->ai_flags;
2421 if (pai->ai_flags & AI_CANONNAME)
2422 (void)get_canonname(pai, res, canonname);
2427 cur->ai_next = res0;
2428 while (cur && cur->ai_next)
2438 return sentinel.ai_next;
2443 _yp_getaddrinfo(void *rv, void *cb_data, va_list ap)
2445 struct addrinfo sentinel, *cur;
2446 struct addrinfo *ai = NULL;
2450 const struct addrinfo *pai;
2453 if (_yp_check(&ypdomain) == 0)
2456 name = va_arg(ap, char *);
2457 pai = va_arg(ap, const struct addrinfo *);
2459 memset(&sentinel, 0, sizeof(sentinel));
2462 /* hosts.byname is only for IPv4 (Solaris8) */
2463 if (pai->ai_family == PF_UNSPEC || pai->ai_family == PF_INET) {
2464 r = yp_match(ypdomain, "hosts.byname", name,
2465 (int)strlen(name), &ypbuf, &ypbuflen);
2467 struct addrinfo ai4;
2470 ai4.ai_family = AF_INET;
2471 ai = _yphostent(ypbuf, &ai4);
2474 while (cur && cur->ai_next)
2481 /* ipnodes.byname can hold both IPv4/v6 */
2482 r = yp_match(ypdomain, "ipnodes.byname", name,
2483 (int)strlen(name), &ypbuf, &ypbuflen);
2485 ai = _yphostent(ypbuf, pai);
2491 if (sentinel.ai_next == NULL) {
2492 RES_SET_H_ERRNO(__res_state(), HOST_NOT_FOUND);
2495 *((struct addrinfo **)rv) = sentinel.ai_next;
2500 /* resolver logic */
2503 * Formulate a normal query, send, and await answer.
2504 * Returned answer is placed in supplied buffer "answer".
2505 * Perform preliminary check of answer, returning success only
2506 * if no error is indicated and the answer count is nonzero.
2507 * Return the size of the response on success, -1 on error.
2508 * Error number is left in h_errno.
2510 * Caller must parse answer and determine whether it answers the question.
2513 res_queryN(const char *name, struct res_target *target, res_state res)
2519 struct res_target *t;
2526 buf = malloc(MAXPACKET);
2528 RES_SET_H_ERRNO(res, NETDB_INTERNAL);
2532 for (t = target; t; t = t->next) {
2537 hp = (HEADER *)(void *)t->answer;
2539 /* make it easier... */
2545 oflags = res->_flags;
2548 hp->rcode = NOERROR; /* default */
2551 if (res->options & RES_DEBUG)
2552 printf(";; res_query(%s, %d, %d)\n", name, class, type);
2555 n = res_nmkquery(res, QUERY, name, class, type, NULL, 0, NULL,
2557 if (n > 0 && (res->_flags & RES_F_EDNS0ERR) == 0 &&
2558 (res->options & (RES_USE_EDNS0|RES_USE_DNSSEC)) != 0U)
2559 n = res_nopt(res, n, buf, MAXPACKET, anslen);
2562 if (res->options & RES_DEBUG)
2563 printf(";; res_query: mkquery failed\n");
2566 RES_SET_H_ERRNO(res, NO_RECOVERY);
2569 n = res_nsend(res, buf, n, answer, anslen);
2572 * if the query choked with EDNS0, retry
2575 if ((res->options & (RES_USE_EDNS0|RES_USE_DNSSEC))
2577 ((oflags ^ res->_flags) & RES_F_EDNS0ERR) != 0) {
2578 res->_flags |= RES_F_EDNS0ERR;
2579 if (res->options & RES_DEBUG)
2580 printf(";; res_nquery: retry without EDNS0\n");
2583 rcode = hp->rcode; /* record most recent error */
2585 if (res->options & RES_DEBUG)
2586 printf(";; res_query: send error\n");
2592 hp->rcode = FORMERR; /* XXX not very informative */
2593 if (hp->rcode != NOERROR || ntohs(hp->ancount) == 0) {
2594 rcode = hp->rcode; /* record most recent error */
2596 if (res->options & RES_DEBUG)
2597 printf(";; rcode = %u, ancount=%u\n", hp->rcode,
2598 ntohs(hp->ancount));
2603 ancount += ntohs(hp->ancount);
2613 RES_SET_H_ERRNO(res, HOST_NOT_FOUND);
2616 RES_SET_H_ERRNO(res, TRY_AGAIN);
2619 RES_SET_H_ERRNO(res, NO_DATA);
2625 RES_SET_H_ERRNO(res, NO_RECOVERY);
2634 * Formulate a normal query, send, and retrieve answer in supplied buffer.
2635 * Return the size of the response on success, -1 on error.
2636 * If enabled, implement search rules until answer or unrecoverable failure
2637 * is detected. Error code, if any, is left in h_errno.
2640 res_searchN(const char *name, struct res_target *target, res_state res)
2642 const char *cp, * const *domain;
2643 HEADER *hp = (HEADER *)(void *)target->answer; /*XXX*/
2645 int trailing_dot, ret, saved_herrno;
2646 int got_nodata = 0, got_servfail = 0, root_on_list = 0;
2647 int tried_as_is = 0;
2649 char abuf[MAXDNAME];
2652 RES_SET_H_ERRNO(res, HOST_NOT_FOUND); /* default, if we never query */
2654 for (cp = name; *cp; cp++)
2655 dots += (*cp == '.');
2657 if (cp > name && *--cp == '.')
2661 * if there aren't any dots, it could be a user-level alias
2664 (cp = res_hostalias(res, name, abuf, sizeof(abuf))) != NULL)
2665 return (res_queryN(cp, target, res));
2668 * If there are enough dots in the name, let's just give it a
2669 * try 'as is'. The threshold can be set with the "ndots" option.
2670 * Also, query 'as is', if there is a trailing dot in the name.
2673 if (dots >= res->ndots || trailing_dot) {
2674 ret = res_querydomainN(name, NULL, target, res);
2675 if (ret > 0 || trailing_dot)
2677 if (errno == ECONNREFUSED) {
2678 RES_SET_H_ERRNO(res, TRY_AGAIN);
2681 switch (res->res_h_errno) {
2683 case HOST_NOT_FOUND:
2686 if (hp->rcode == SERVFAIL)
2692 saved_herrno = res->res_h_errno;
2697 * We do at least one level of search if
2698 * - there is no dot and RES_DEFNAME is set, or
2699 * - there is at least one dot, there is no trailing dot,
2700 * and RES_DNSRCH is set.
2702 if ((!dots && (res->options & RES_DEFNAMES)) ||
2703 (dots && !trailing_dot && (res->options & RES_DNSRCH))) {
2706 for (domain = (const char * const *)res->dnsrch;
2711 if (domain[0][0] == '\0' ||
2712 (domain[0][0] == '.' && domain[0][1] == '\0'))
2715 if (root_on_list && tried_as_is)
2718 ret = res_querydomainN(name, *domain, target, res);
2723 * If no server present, give up.
2724 * If name isn't found in this domain,
2725 * keep trying higher domains in the search list
2726 * (if that's enabled).
2727 * On a NO_DATA error, keep trying, otherwise
2728 * a wildcard entry of another type could keep us
2729 * from finding this entry higher in the domain.
2730 * If we get some other error (negative answer or
2731 * server failure), then stop searching up,
2732 * but try the input name below in case it's
2735 if (errno == ECONNREFUSED) {
2736 RES_SET_H_ERRNO(res, TRY_AGAIN);
2740 switch (res->res_h_errno) {
2744 case HOST_NOT_FOUND:
2749 if (hp->rcode == SERVFAIL) {
2750 /* try next search element, if any */
2755 /* anything else implies that we're done */
2759 * if we got here for some reason other than DNSRCH,
2760 * we only wanted one iteration of the loop, so stop.
2762 if (!(res->options & RES_DNSRCH))
2767 switch (res->res_h_errno) {
2769 case HOST_NOT_FOUND:
2772 if (hp->rcode == SERVFAIL)
2780 * If the query has not already been tried as is then try it
2781 * unless RES_NOTLDQUERY is set and there were no dots.
2783 if ((dots || !searched || !(res->options & RES_NOTLDQUERY)) &&
2784 !(tried_as_is || root_on_list)) {
2785 ret = res_querydomainN(name, NULL, target, res);
2791 * if we got here, we didn't satisfy the search.
2792 * if we did an initial full query, return that query's h_errno
2793 * (note that we wouldn't be here if that query had succeeded).
2794 * else if we ever got a nodata, send that back as the reason.
2795 * else send back meaningless h_errno, that being the one from
2796 * the last DNSRCH we did.
2799 if (saved_herrno != -1)
2800 RES_SET_H_ERRNO(res, saved_herrno);
2801 else if (got_nodata)
2802 RES_SET_H_ERRNO(res, NO_DATA);
2803 else if (got_servfail)
2804 RES_SET_H_ERRNO(res, TRY_AGAIN);
2809 * Perform a call on res_query on the concatenation of name and domain,
2810 * removing a trailing dot from name if domain is NULL.
2813 res_querydomainN(const char *name, const char *domain,
2814 struct res_target *target, res_state res)
2816 char nbuf[MAXDNAME];
2817 const char *longname = nbuf;
2821 if (res->options & RES_DEBUG)
2822 printf(";; res_querydomain(%s, %s)\n",
2823 name, domain?domain:"<Nil>");
2825 if (domain == NULL) {
2827 * Check for trailing '.';
2828 * copy without '.' if present.
2831 if (n >= MAXDNAME) {
2832 RES_SET_H_ERRNO(res, NO_RECOVERY);
2835 if (n > 0 && name[--n] == '.') {
2836 strncpy(nbuf, name, n);
2843 if (n + d + 1 >= MAXDNAME) {
2844 RES_SET_H_ERRNO(res, NO_RECOVERY);
2847 snprintf(nbuf, sizeof(nbuf), "%s.%s", name, domain);
2849 return (res_queryN(longname, target, res));