1 /* $KAME: getaddrinfo.c,v 1.15 2000/07/09 04:37:24 itojun Exp $ */
4 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the project nor the names of its contributors
16 * may be used to endorse or promote products derived from this software
17 * without specific prior written permission.
19 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 * "#ifdef FAITH" part is local hack for supporting IPv4-v6 translator.
35 * Issues to be discussed:
36 * - Return values. There are nonstandard return values defined and used
37 * in the source code. This is because RFC2553 is silent about which error
38 * code must be returned for which situation.
39 * - freeaddrinfo(NULL). RFC2553 is silent about it. XNET 5.2 says it is
40 * invalid. current code - SEGV on freeaddrinfo(NULL)
43 * - The code filters out AFs that are not supported by the kernel,
44 * when globbing NULL hostname (to loopback, or wildcard). Is it the right
45 * thing to do? What is the relationship with post-RFC2553 AI_ADDRCONFIG
47 * - (post-2553) semantics of AI_ADDRCONFIG itself is too vague.
48 * (1) what should we do against numeric hostname (2) what should we do
49 * against NULL hostname (3) what is AI_ADDRCONFIG itself. AF not ready?
50 * non-loopback address configured? global address configured?
52 * OS specific notes for freebsd4:
53 * - FreeBSD supported $GAI. The code does not.
56 #include <sys/cdefs.h>
57 __FBSDID("$FreeBSD$");
59 #include "namespace.h"
60 #include <sys/types.h>
61 #include <sys/param.h>
62 #include <sys/socket.h>
64 #include <netinet/in.h>
65 #include <net/if_types.h>
67 #include <sys/queue.h>
69 #include <net/if_var.h>
70 #include <sys/sysctl.h>
71 #include <sys/ioctl.h>
72 #include <netinet6/in6_var.h>
73 #include <netinet6/nd6.h>
75 #include <arpa/inet.h>
76 #include <arpa/nameser.h>
78 #include <rpcsvc/yp_prot.h>
79 #include <rpcsvc/ypclnt.h>
90 #include "res_config.h"
98 #include "un-namespace.h"
99 #include "libc_private.h"
104 #if defined(__KAME__) && defined(INET6)
112 static const char in_addrany[] = { 0, 0, 0, 0 };
113 static const char in_loopback[] = { 127, 0, 0, 1 };
115 static const char in6_addrany[] = {
116 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
118 static const char in6_loopback[] = {
119 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1
124 TAILQ_ENTRY(policyqueue) pc_entry;
126 struct in6_addrpolicy pc_policy;
129 TAILQ_HEAD(policyhead, policyqueue);
131 static const struct afd {
136 const char *a_addrany;
137 const char *a_loopback;
142 {PF_INET6, sizeof(struct in6_addr),
143 sizeof(struct sockaddr_in6),
144 offsetof(struct sockaddr_in6, sin6_addr),
145 in6_addrany, in6_loopback, 1},
150 {PF_INET, sizeof(struct in_addr),
151 sizeof(struct sockaddr_in),
152 offsetof(struct sockaddr_in, sin_addr),
153 in_addrany, in_loopback, 0},
154 {0, 0, 0, 0, NULL, NULL, 0},
161 const char *e_protostr;
163 #define WILD_AF(ex) ((ex)->e_wild & 0x01)
164 #define WILD_SOCKTYPE(ex) ((ex)->e_wild & 0x02)
165 #define WILD_PROTOCOL(ex) ((ex)->e_wild & 0x04)
168 static const struct explore explore[] = {
170 { PF_LOCAL, ANY, ANY, NULL, 0x01 },
173 { PF_INET6, SOCK_DGRAM, IPPROTO_UDP, "udp", 0x07 },
174 { PF_INET6, SOCK_STREAM, IPPROTO_TCP, "tcp", 0x07 },
175 { PF_INET6, SOCK_STREAM, IPPROTO_SCTP, "sctp", 0x03 },
176 { PF_INET6, SOCK_SEQPACKET, IPPROTO_SCTP, "sctp", 0x07 },
177 { PF_INET6, SOCK_RAW, ANY, NULL, 0x05 },
179 { PF_INET, SOCK_DGRAM, IPPROTO_UDP, "udp", 0x07 },
180 { PF_INET, SOCK_STREAM, IPPROTO_TCP, "tcp", 0x07 },
181 { PF_INET, SOCK_STREAM, IPPROTO_SCTP, "sctp", 0x03 },
182 { PF_INET, SOCK_SEQPACKET, IPPROTO_SCTP, "sctp", 0x07 },
183 { PF_INET, SOCK_RAW, ANY, NULL, 0x05 },
184 { -1, 0, 0, NULL, 0 },
193 #define AIO_SRCFLAG_DEPRECATED 0x1
197 struct sockaddr_storage aiou_ss;
198 struct sockaddr aiou_sa;
200 #define aio_srcsa aio_src_un.aiou_sa
201 u_int32_t aio_srcflag;
204 struct policyqueue *aio_srcpolicy;
205 struct policyqueue *aio_dstpolicy;
206 struct addrinfo *aio_ai;
210 static const ns_src default_dns_files[] = {
211 { NSSRC_FILES, NS_SUCCESS },
212 { NSSRC_DNS, NS_SUCCESS },
217 struct res_target *next;
218 const char *name; /* domain name */
219 int qclass, qtype; /* class and type of query */
220 u_char *answer; /* buffer to put answer */
221 int anslen; /* size of answer buffer */
222 int n; /* result length */
225 #define MAXPACKET (64*1024)
229 u_char buf[MAXPACKET];
232 static int str2number(const char *, int *);
233 static int explore_copy(const struct addrinfo *, const struct addrinfo *,
235 static int explore_null(const struct addrinfo *,
236 const char *, struct addrinfo **);
237 static int explore_numeric(const struct addrinfo *, const char *,
238 const char *, struct addrinfo **, const char *);
239 static int explore_numeric_scope(const struct addrinfo *, const char *,
240 const char *, struct addrinfo **);
241 static int get_canonname(const struct addrinfo *,
242 struct addrinfo *, const char *);
243 static struct addrinfo *get_ai(const struct addrinfo *,
244 const struct afd *, const char *);
245 static struct addrinfo *copy_ai(const struct addrinfo *);
246 static int get_portmatch(const struct addrinfo *, const char *);
247 static int get_port(struct addrinfo *, const char *, int);
248 static const struct afd *find_afd(int);
249 static int addrconfig(struct addrinfo *);
251 static int is_ifdisabled(char *);
253 static void set_source(struct ai_order *, struct policyhead *);
254 static int comp_dst(const void *, const void *);
256 static int ip6_str2scopeid(char *, struct sockaddr_in6 *, u_int32_t *);
258 static int gai_addr2scopetype(struct sockaddr *);
260 static int explore_fqdn(const struct addrinfo *, const char *,
261 const char *, struct addrinfo **);
263 static int reorder(struct addrinfo *);
264 static int get_addrselectpolicy(struct policyhead *);
265 static void free_addrselectpolicy(struct policyhead *);
266 static struct policyqueue *match_addrselectpolicy(struct sockaddr *,
267 struct policyhead *);
268 static int matchlen(struct sockaddr *, struct sockaddr *);
270 static struct addrinfo *getanswer(const querybuf *, int, const char *, int,
271 const struct addrinfo *, res_state);
272 #if defined(RESOLVSORT)
273 static int addr4sort(struct addrinfo *, res_state);
275 static int _dns_getaddrinfo(void *, void *, va_list);
276 static void _sethtent(FILE **);
277 static void _endhtent(FILE **);
278 static struct addrinfo *_gethtent(FILE **, const char *,
279 const struct addrinfo *);
280 static int _files_getaddrinfo(void *, void *, va_list);
282 static struct addrinfo *_yphostent(char *, const struct addrinfo *);
283 static int _yp_getaddrinfo(void *, void *, va_list);
286 static int addrinfo_id_func(char *, size_t *, va_list, void *);
287 static int addrinfo_marshal_func(char *, size_t *, void *, va_list, void *);
288 static int addrinfo_unmarshal_func(char *, size_t, void *, va_list, void *);
291 static int res_queryN(const char *, struct res_target *, res_state);
292 static int res_searchN(const char *, struct res_target *, res_state);
293 static int res_querydomainN(const char *, const char *,
294 struct res_target *, res_state);
296 /* XXX macros that make external reference is BAD. */
298 #define GET_AI(ai, afd, addr) \
300 /* external reference: pai, error, and label free */ \
301 (ai) = get_ai(pai, (afd), (addr)); \
302 if ((ai) == NULL) { \
303 error = EAI_MEMORY; \
306 } while (/*CONSTCOND*/0)
308 #define GET_PORT(ai, serv) \
310 /* external reference: error and label free */ \
311 error = get_port((ai), (serv), 0); \
314 } while (/*CONSTCOND*/0)
316 #define GET_CANONNAME(ai, str) \
318 /* external reference: pai, error and label free */ \
319 error = get_canonname(pai, (ai), (str)); \
322 } while (/*CONSTCOND*/0)
326 /* external reference: error, and label bad */ \
330 } while (/*CONSTCOND*/0)
332 #define MATCH_FAMILY(x, y, w) \
333 ((x) == (y) || (/*CONSTCOND*/(w) && ((x) == PF_UNSPEC || (y) == PF_UNSPEC)))
334 #define MATCH(x, y, w) \
335 ((x) == (y) || (/*CONSTCOND*/(w) && ((x) == ANY || (y) == ANY)))
338 freeaddrinfo(struct addrinfo *ai)
340 struct addrinfo *next;
344 if (ai->ai_canonname)
345 free(ai->ai_canonname);
346 /* no need to free(ai->ai_addr) */
353 str2number(const char *p, int *portp)
362 v = strtoul(p, &ep, 10);
363 if (errno == 0 && ep && *ep == '\0' && v <= UINT_MAX) {
371 getaddrinfo(const char *hostname, const char *servname,
372 const struct addrinfo *hints, struct addrinfo **res)
374 struct addrinfo sentinel;
375 struct addrinfo *cur;
377 struct addrinfo ai, ai0, *afai;
378 struct addrinfo *pai;
379 const struct afd *afd;
380 const struct explore *ex;
381 struct addrinfo *afailist[sizeof(afdl)/sizeof(afdl[0])];
382 struct addrinfo *afai_unspec;
386 /* ensure we return NULL on errors */
389 memset(&ai, 0, sizeof(ai));
391 memset(afailist, 0, sizeof(afailist));
394 memset(&sentinel, 0, sizeof(sentinel));
398 pai->ai_family = PF_UNSPEC;
399 pai->ai_socktype = ANY;
400 pai->ai_protocol = ANY;
402 pai->ai_canonname = NULL;
406 if (hostname == NULL && servname == NULL)
409 /* error check for hints */
410 if (hints->ai_addrlen || hints->ai_canonname ||
411 hints->ai_addr || hints->ai_next)
412 ERR(EAI_BADHINTS); /* xxx */
413 if (hints->ai_flags & ~AI_MASK)
415 switch (hints->ai_family) {
425 memcpy(pai, hints, sizeof(*pai));
428 * if both socktype/protocol are specified, check if they
429 * are meaningful combination.
431 if (pai->ai_socktype != ANY && pai->ai_protocol != ANY) {
432 for (ex = explore; ex->e_af >= 0; ex++) {
433 if (!MATCH_FAMILY(pai->ai_family, ex->e_af,
436 if (!MATCH(pai->ai_socktype, ex->e_socktype,
439 if (!MATCH(pai->ai_protocol, ex->e_protocol,
453 * check for special cases. (1) numeric servname is disallowed if
454 * socktype/protocol are left unspecified. (2) servname is disallowed
455 * for raw and other inet{,6} sockets.
457 if (MATCH_FAMILY(pai->ai_family, PF_INET, 1)
459 || MATCH_FAMILY(pai->ai_family, PF_INET6, 1)
462 ai0 = *pai; /* backup *pai */
464 if (pai->ai_family == PF_UNSPEC) {
466 pai->ai_family = PF_INET6;
468 pai->ai_family = PF_INET;
471 error = get_portmatch(pai, servname);
481 * NULL hostname, or numeric hostname.
482 * If numeric representation of AF1 can be interpreted as FQDN
483 * representation of AF2, we need to think again about the code below.
486 for (afd = afdl; afd->a_af; afd++) {
489 if (!MATCH_FAMILY(pai->ai_family, afd->a_af, 1))
492 if (pai->ai_family == PF_UNSPEC)
493 pai->ai_family = afd->a_af;
495 if (hostname == NULL) {
496 error = explore_null(pai, servname,
497 &afailist[afd - afdl]);
500 * Errors from explore_null should be unexpected and
501 * be caught to avoid returning an incomplete result.
506 error = explore_numeric_scope(pai, hostname, servname,
507 &afailist[afd - afdl]);
510 * explore_numeric_scope returns an error for address
511 * families that do not match that of hostname.
512 * Thus we should not catch the error at this moment.
516 if (!error && afailist[afd - afdl])
524 if (hostname == NULL)
525 ERR(EAI_NONAME); /* used to be EAI_NODATA */
526 if (pai->ai_flags & AI_NUMERICHOST)
529 if ((pai->ai_flags & AI_ADDRCONFIG) != 0 && !addrconfig(&ai0))
533 * hostname as alphabetical name.
536 error = explore_fqdn(pai, hostname, servname, &afai_unspec);
539 for (ex = explore; ex->e_af >= 0; ex++) {
542 if (!MATCH_FAMILY(pai->ai_family, ex->e_af, WILD_AF(ex)))
544 if (!MATCH(pai->ai_socktype, ex->e_socktype,
547 if (!MATCH(pai->ai_protocol, ex->e_protocol,
551 if (pai->ai_family == PF_UNSPEC)
552 pai->ai_family = ex->e_af;
553 if (pai->ai_socktype == ANY && ex->e_socktype != ANY)
554 pai->ai_socktype = ex->e_socktype;
555 if (pai->ai_protocol == ANY && ex->e_protocol != ANY)
556 pai->ai_protocol = ex->e_protocol;
559 * if the servname does not match socktype/protocol, ignore it.
561 if (get_portmatch(pai, servname) != 0)
567 if ((afd = find_afd(pai->ai_family)) == NULL)
569 /* XXX assumes that afd points inside afdl[] */
570 afai = afailist[afd - afdl];
575 error = explore_copy(pai, afai, &cur->ai_next);
579 while (cur && cur->ai_next)
584 * ensure we return either:
585 * - error == 0, non-NULL *res
586 * - error != 0, NULL *res
589 if (sentinel.ai_next) {
591 * If the returned entry is for an active connection,
592 * and the given name is not numeric, reorder the
593 * list, so that the application would try the list
594 * in the most efficient order. Since the head entry
595 * of the original list may contain ai_canonname and
596 * that entry may be moved elsewhere in the new list,
597 * we keep the pointer and will restore it in the new
598 * head entry. (Note that RFC3493 requires the head
599 * entry store it when requested by the caller).
601 if (hints == NULL || !(hints->ai_flags & AI_PASSIVE)) {
606 sentinel.ai_next->ai_canonname;
607 sentinel.ai_next->ai_canonname = NULL;
608 (void)reorder(&sentinel);
609 if (sentinel.ai_next->ai_canonname ==
611 sentinel.ai_next->ai_canonname
613 } else if (canonname != NULL)
617 *res = sentinel.ai_next;
624 freeaddrinfo(afai_unspec);
625 for (afd = afdl; afd->a_af; afd++) {
626 if (afailist[afd - afdl])
627 freeaddrinfo(afailist[afd - afdl]);
630 if (sentinel.ai_next)
631 freeaddrinfo(sentinel.ai_next);
637 reorder(struct addrinfo *sentinel)
639 struct addrinfo *ai, **aip;
640 struct ai_order *aio;
642 struct policyhead policyhead;
644 /* count the number of addrinfo elements for sorting. */
645 for (n = 0, ai = sentinel->ai_next; ai != NULL; ai = ai->ai_next, n++)
649 * If the number is small enough, we can skip the reordering process.
654 /* allocate a temporary array for sort and initialization of it. */
655 if ((aio = malloc(sizeof(*aio) * n)) == NULL)
656 return(n); /* give up reordering */
657 memset(aio, 0, sizeof(*aio) * n);
659 /* retrieve address selection policy from the kernel */
660 TAILQ_INIT(&policyhead);
661 if (!get_addrselectpolicy(&policyhead)) {
662 /* no policy is installed into kernel, we don't sort. */
667 for (i = 0, ai = sentinel->ai_next; i < n; ai = ai->ai_next, i++) {
669 aio[i].aio_dstscope = gai_addr2scopetype(ai->ai_addr);
670 aio[i].aio_dstpolicy = match_addrselectpolicy(ai->ai_addr,
672 set_source(&aio[i], &policyhead);
675 /* perform sorting. */
676 qsort(aio, n, sizeof(*aio), comp_dst);
678 /* reorder the addrinfo chain. */
679 for (i = 0, aip = &sentinel->ai_next; i < n; i++) {
680 *aip = aio[i].aio_ai;
681 aip = &aio[i].aio_ai->ai_next;
685 /* cleanup and return */
687 free_addrselectpolicy(&policyhead);
692 get_addrselectpolicy(struct policyhead *head)
695 int mib[] = { CTL_NET, PF_INET6, IPPROTO_IPV6, IPV6CTL_ADDRCTLPOLICY };
698 struct in6_addrpolicy *pol, *ep;
700 if (sysctl(mib, sizeof(mib) / sizeof(mib[0]), NULL, &l, NULL, 0) < 0)
704 if ((buf = malloc(l)) == NULL)
706 if (sysctl(mib, sizeof(mib) / sizeof(mib[0]), buf, &l, NULL, 0) < 0) {
711 ep = (struct in6_addrpolicy *)(buf + l);
712 for (pol = (struct in6_addrpolicy *)buf; pol + 1 <= ep; pol++) {
713 struct policyqueue *new;
715 if ((new = malloc(sizeof(*new))) == NULL) {
716 free_addrselectpolicy(head); /* make the list empty */
719 new->pc_policy = *pol;
720 TAILQ_INSERT_TAIL(head, new, pc_entry);
731 free_addrselectpolicy(struct policyhead *head)
733 struct policyqueue *ent, *nent;
735 for (ent = TAILQ_FIRST(head); ent; ent = nent) {
736 nent = TAILQ_NEXT(ent, pc_entry);
737 TAILQ_REMOVE(head, ent, pc_entry);
742 static struct policyqueue *
743 match_addrselectpolicy(struct sockaddr *addr, struct policyhead *head)
746 struct policyqueue *ent, *bestent = NULL;
747 struct in6_addrpolicy *pol;
748 int matchlen, bestmatchlen = -1;
749 u_char *mp, *ep, *k, *p, m;
750 struct sockaddr_in6 key;
752 switch(addr->sa_family) {
754 key = *(struct sockaddr_in6 *)addr;
757 /* convert the address into IPv4-mapped IPv6 address. */
758 memset(&key, 0, sizeof(key));
759 key.sin6_family = AF_INET6;
760 key.sin6_len = sizeof(key);
761 key.sin6_addr.s6_addr[10] = 0xff;
762 key.sin6_addr.s6_addr[11] = 0xff;
763 memcpy(&key.sin6_addr.s6_addr[12],
764 &((struct sockaddr_in *)addr)->sin_addr, 4);
770 for (ent = TAILQ_FIRST(head); ent; ent = TAILQ_NEXT(ent, pc_entry)) {
771 pol = &ent->pc_policy;
774 mp = (u_char *)&pol->addrmask.sin6_addr;
775 ep = mp + 16; /* XXX: scope field? */
776 k = (u_char *)&key.sin6_addr;
777 p = (u_char *)&pol->addr.sin6_addr;
778 for (; mp < ep && *mp; mp++, k++, p++) {
781 goto next; /* not match */
782 if (m == 0xff) /* short cut for a typical case */
792 /* matched. check if this is better than the current best. */
793 if (matchlen > bestmatchlen) {
795 bestmatchlen = matchlen;
810 set_source(struct ai_order *aio, struct policyhead *ph)
812 struct addrinfo ai = *aio->aio_ai;
813 struct sockaddr_storage ss;
817 /* set unspec ("no source is available"), just in case */
818 aio->aio_srcsa.sa_family = AF_UNSPEC;
819 aio->aio_srcscope = -1;
821 switch(ai.ai_family) {
827 default: /* ignore unsupported AFs explicitly */
831 /* XXX: make a dummy addrinfo to call connect() */
832 ai.ai_socktype = SOCK_DGRAM;
833 ai.ai_protocol = IPPROTO_UDP; /* is UDP too specific? */
835 memset(&ss, 0, sizeof(ss));
836 memcpy(&ss, ai.ai_addr, ai.ai_addrlen);
837 ai.ai_addr = (struct sockaddr *)&ss;
838 get_port(&ai, "1", 0);
840 /* open a socket to get the source address for the given dst */
841 if ((s = _socket(ai.ai_family, ai.ai_socktype, ai.ai_protocol)) < 0)
842 return; /* give up */
843 if (_connect(s, ai.ai_addr, ai.ai_addrlen) < 0)
845 srclen = ai.ai_addrlen;
846 if (_getsockname(s, &aio->aio_srcsa, &srclen) < 0) {
847 aio->aio_srcsa.sa_family = AF_UNSPEC;
850 aio->aio_srcscope = gai_addr2scopetype(&aio->aio_srcsa);
851 aio->aio_srcpolicy = match_addrselectpolicy(&aio->aio_srcsa, ph);
852 aio->aio_matchlen = matchlen(&aio->aio_srcsa, aio->aio_ai->ai_addr);
854 if (ai.ai_family == AF_INET6) {
855 struct in6_ifreq ifr6;
858 memset(&ifr6, 0, sizeof(ifr6));
859 memcpy(&ifr6.ifr_addr, ai.ai_addr, ai.ai_addrlen);
860 if (_ioctl(s, SIOCGIFAFLAG_IN6, &ifr6) == 0) {
861 flags6 = ifr6.ifr_ifru.ifru_flags6;
862 if ((flags6 & IN6_IFF_DEPRECATED))
863 aio->aio_srcflag |= AIO_SRCFLAG_DEPRECATED;
874 matchlen(struct sockaddr *src, struct sockaddr *dst)
881 switch (src->sa_family) {
884 s = (u_char *)&((struct sockaddr_in6 *)src)->sin6_addr;
885 d = (u_char *)&((struct sockaddr_in6 *)dst)->sin6_addr;
886 addrlen = sizeof(struct in6_addr);
891 s = (u_char *)&((struct sockaddr_in *)src)->sin_addr;
892 d = (u_char *)&((struct sockaddr_in *)dst)->sin_addr;
893 addrlen = sizeof(struct in_addr);
901 if ((r = (*d++ ^ *s++)) != 0) {
902 while (r < addrlen * 8) {
913 comp_dst(const void *arg1, const void *arg2)
915 const struct ai_order *dst1 = arg1, *dst2 = arg2;
918 * Rule 1: Avoid unusable destinations.
919 * XXX: we currently do not consider if an appropriate route exists.
921 if (dst1->aio_srcsa.sa_family != AF_UNSPEC &&
922 dst2->aio_srcsa.sa_family == AF_UNSPEC) {
925 if (dst1->aio_srcsa.sa_family == AF_UNSPEC &&
926 dst2->aio_srcsa.sa_family != AF_UNSPEC) {
930 /* Rule 2: Prefer matching scope. */
931 if (dst1->aio_dstscope == dst1->aio_srcscope &&
932 dst2->aio_dstscope != dst2->aio_srcscope) {
935 if (dst1->aio_dstscope != dst1->aio_srcscope &&
936 dst2->aio_dstscope == dst2->aio_srcscope) {
940 /* Rule 3: Avoid deprecated addresses. */
941 if (dst1->aio_srcsa.sa_family != AF_UNSPEC &&
942 dst2->aio_srcsa.sa_family != AF_UNSPEC) {
943 if (!(dst1->aio_srcflag & AIO_SRCFLAG_DEPRECATED) &&
944 (dst2->aio_srcflag & AIO_SRCFLAG_DEPRECATED)) {
947 if ((dst1->aio_srcflag & AIO_SRCFLAG_DEPRECATED) &&
948 !(dst2->aio_srcflag & AIO_SRCFLAG_DEPRECATED)) {
953 /* Rule 4: Prefer home addresses. */
954 /* XXX: not implemented yet */
956 /* Rule 5: Prefer matching label. */
958 if (dst1->aio_srcpolicy && dst1->aio_dstpolicy &&
959 dst1->aio_srcpolicy->pc_policy.label ==
960 dst1->aio_dstpolicy->pc_policy.label &&
961 (dst2->aio_srcpolicy == NULL || dst2->aio_dstpolicy == NULL ||
962 dst2->aio_srcpolicy->pc_policy.label !=
963 dst2->aio_dstpolicy->pc_policy.label)) {
966 if (dst2->aio_srcpolicy && dst2->aio_dstpolicy &&
967 dst2->aio_srcpolicy->pc_policy.label ==
968 dst2->aio_dstpolicy->pc_policy.label &&
969 (dst1->aio_srcpolicy == NULL || dst1->aio_dstpolicy == NULL ||
970 dst1->aio_srcpolicy->pc_policy.label !=
971 dst1->aio_dstpolicy->pc_policy.label)) {
976 /* Rule 6: Prefer higher precedence. */
978 if (dst1->aio_dstpolicy &&
979 (dst2->aio_dstpolicy == NULL ||
980 dst1->aio_dstpolicy->pc_policy.preced >
981 dst2->aio_dstpolicy->pc_policy.preced)) {
984 if (dst2->aio_dstpolicy &&
985 (dst1->aio_dstpolicy == NULL ||
986 dst2->aio_dstpolicy->pc_policy.preced >
987 dst1->aio_dstpolicy->pc_policy.preced)) {
992 /* Rule 7: Prefer native transport. */
993 /* XXX: not implemented yet */
995 /* Rule 8: Prefer smaller scope. */
996 if (dst1->aio_dstscope >= 0 &&
997 dst1->aio_dstscope < dst2->aio_dstscope) {
1000 if (dst2->aio_dstscope >= 0 &&
1001 dst2->aio_dstscope < dst1->aio_dstscope) {
1006 * Rule 9: Use longest matching prefix.
1007 * We compare the match length in a same AF only.
1009 if (dst1->aio_ai->ai_addr->sa_family ==
1010 dst2->aio_ai->ai_addr->sa_family &&
1011 dst1->aio_ai->ai_addr->sa_family != AF_INET) {
1012 if (dst1->aio_matchlen > dst2->aio_matchlen) {
1015 if (dst1->aio_matchlen < dst2->aio_matchlen) {
1020 /* Rule 10: Otherwise, leave the order unchanged. */
1025 * Copy from scope.c.
1026 * XXX: we should standardize the functions and link them as standard
1030 gai_addr2scopetype(struct sockaddr *sa)
1033 struct sockaddr_in6 *sa6;
1035 struct sockaddr_in *sa4;
1037 switch(sa->sa_family) {
1040 sa6 = (struct sockaddr_in6 *)sa;
1041 if (IN6_IS_ADDR_MULTICAST(&sa6->sin6_addr)) {
1042 /* just use the scope field of the multicast address */
1043 return(sa6->sin6_addr.s6_addr[2] & 0x0f);
1046 * Unicast addresses: map scope type to corresponding scope
1047 * value defined for multcast addresses.
1048 * XXX: hardcoded scope type values are bad...
1050 if (IN6_IS_ADDR_LOOPBACK(&sa6->sin6_addr))
1051 return(1); /* node local scope */
1052 if (IN6_IS_ADDR_LINKLOCAL(&sa6->sin6_addr))
1053 return(2); /* link-local scope */
1054 if (IN6_IS_ADDR_SITELOCAL(&sa6->sin6_addr))
1055 return(5); /* site-local scope */
1056 return(14); /* global scope */
1061 * IPv4 pseudo scoping according to RFC 3484.
1063 sa4 = (struct sockaddr_in *)sa;
1064 /* IPv4 autoconfiguration addresses have link-local scope. */
1065 if (((u_char *)&sa4->sin_addr)[0] == 169 &&
1066 ((u_char *)&sa4->sin_addr)[1] == 254)
1068 /* Private addresses have site-local scope. */
1069 if (((u_char *)&sa4->sin_addr)[0] == 10 ||
1070 (((u_char *)&sa4->sin_addr)[0] == 172 &&
1071 (((u_char *)&sa4->sin_addr)[1] & 0xf0) == 16) ||
1072 (((u_char *)&sa4->sin_addr)[0] == 192 &&
1073 ((u_char *)&sa4->sin_addr)[1] == 168))
1074 return(14); /* XXX: It should be 5 unless NAT */
1075 /* Loopback addresses have link-local scope. */
1076 if (((u_char *)&sa4->sin_addr)[0] == 127)
1081 errno = EAFNOSUPPORT; /* is this a good error? */
1087 explore_copy(const struct addrinfo *pai, const struct addrinfo *src0,
1088 struct addrinfo **res)
1091 struct addrinfo sentinel, *cur;
1092 const struct addrinfo *src;
1095 sentinel.ai_next = NULL;
1098 for (src = src0; src != NULL; src = src->ai_next) {
1099 if (src->ai_family != pai->ai_family)
1102 cur->ai_next = copy_ai(src);
1103 if (!cur->ai_next) {
1108 cur->ai_next->ai_socktype = pai->ai_socktype;
1109 cur->ai_next->ai_protocol = pai->ai_protocol;
1113 *res = sentinel.ai_next;
1117 freeaddrinfo(sentinel.ai_next);
1123 * passive socket -> anyaddr (0.0.0.0 or ::)
1124 * non-passive socket -> localhost (127.0.0.1 or ::1)
1127 explore_null(const struct addrinfo *pai, const char *servname,
1128 struct addrinfo **res)
1131 const struct afd *afd;
1132 struct addrinfo *ai;
1139 * filter out AFs that are not supported by the kernel
1142 s = _socket(pai->ai_family, SOCK_DGRAM, 0);
1144 if (errno != EMFILE)
1149 afd = find_afd(pai->ai_family);
1153 if (pai->ai_flags & AI_PASSIVE) {
1154 GET_AI(ai, afd, afd->a_addrany);
1155 GET_PORT(ai, servname);
1157 GET_AI(ai, afd, afd->a_loopback);
1158 GET_PORT(ai, servname);
1174 explore_numeric(const struct addrinfo *pai, const char *hostname,
1175 const char *servname, struct addrinfo **res, const char *canonname)
1177 const struct afd *afd;
1178 struct addrinfo *ai;
1180 char pton[PTON_MAX];
1185 afd = find_afd(pai->ai_family);
1189 switch (afd->a_af) {
1192 * RFC3493 requires getaddrinfo() to accept AF_INET formats
1193 * that are accepted by inet_addr() and its family. The
1194 * accepted forms includes the "classful" one, which inet_pton
1195 * does not accept. So we need to separate the case for
1198 if (inet_aton(hostname, (struct in_addr *)pton) != 1)
1202 if (inet_pton(afd->a_af, hostname, pton) != 1)
1207 if (pai->ai_family == afd->a_af) {
1208 GET_AI(ai, afd, pton);
1209 GET_PORT(ai, servname);
1210 if ((pai->ai_flags & AI_CANONNAME)) {
1212 * Set the numeric address itself as the canonical
1213 * name, based on a clarification in RFC3493.
1215 GET_CANONNAME(ai, canonname);
1219 * XXX: This should not happen since we already matched the AF
1236 * numeric hostname with scope
1239 explore_numeric_scope(const struct addrinfo *pai, const char *hostname,
1240 const char *servname, struct addrinfo **res)
1242 #if !defined(SCOPE_DELIMITER) || !defined(INET6)
1243 return explore_numeric(pai, hostname, servname, res, hostname);
1245 const struct afd *afd;
1246 struct addrinfo *cur;
1248 char *cp, *hostname2 = NULL, *scope, *addr;
1249 struct sockaddr_in6 *sin6;
1251 afd = find_afd(pai->ai_family);
1256 return explore_numeric(pai, hostname, servname, res, hostname);
1258 cp = strchr(hostname, SCOPE_DELIMITER);
1260 return explore_numeric(pai, hostname, servname, res, hostname);
1263 * Handle special case of <scoped_address><delimiter><scope id>
1265 hostname2 = strdup(hostname);
1266 if (hostname2 == NULL)
1268 /* terminate at the delimiter */
1269 hostname2[cp - hostname] = '\0';
1273 error = explore_numeric(pai, addr, servname, res, hostname);
1277 for (cur = *res; cur; cur = cur->ai_next) {
1278 if (cur->ai_family != AF_INET6)
1280 sin6 = (struct sockaddr_in6 *)(void *)cur->ai_addr;
1281 if (ip6_str2scopeid(scope, sin6, &scopeid) == -1) {
1285 return(EAI_NONAME); /* XXX: is return OK? */
1287 sin6->sin6_scope_id = scopeid;
1293 if (error && *res) {
1302 get_canonname(const struct addrinfo *pai, struct addrinfo *ai, const char *str)
1304 if ((pai->ai_flags & AI_CANONNAME) != 0) {
1305 ai->ai_canonname = strdup(str);
1306 if (ai->ai_canonname == NULL)
1312 static struct addrinfo *
1313 get_ai(const struct addrinfo *pai, const struct afd *afd, const char *addr)
1316 struct addrinfo *ai;
1318 struct in6_addr faith_prefix;
1325 * Transfrom an IPv4 addr into a special IPv6 addr format for
1326 * IPv6->IPv4 translation gateway. (only TCP is supported now)
1328 * +-----------------------------------+------------+
1329 * | faith prefix part (12 bytes) | embedded |
1330 * | | IPv4 addr part (4 bytes)
1331 * +-----------------------------------+------------+
1333 * faith prefix part is specified as ascii IPv6 addr format
1334 * in environmental variable GAI.
1335 * For FAITH to work correctly, routing to faith prefix must be
1336 * setup toward a machine where a FAITH daemon operates.
1337 * Also, the machine must enable some mechanizm
1338 * (e.g. faith interface hack) to divert those packet with
1339 * faith prefixed destination addr to user-land FAITH daemon.
1341 fp_str = getenv("GAI");
1342 if (fp_str && inet_pton(AF_INET6, fp_str, &faith_prefix) == 1 &&
1343 afd->a_af == AF_INET && pai->ai_socktype == SOCK_STREAM) {
1347 memcpy(&v4a, addr, sizeof v4a);
1348 v4a_top = v4a >> IN_CLASSA_NSHIFT;
1349 if (!IN_MULTICAST(v4a) && !IN_EXPERIMENTAL(v4a) &&
1350 v4a_top != 0 && v4a != IN_LOOPBACKNET) {
1351 afd = &afdl[N_INET6];
1352 memcpy(&faith_prefix.s6_addr[12], addr,
1353 sizeof(struct in_addr));
1359 ai = (struct addrinfo *)malloc(sizeof(struct addrinfo)
1360 + (afd->a_socklen));
1364 memcpy(ai, pai, sizeof(struct addrinfo));
1365 ai->ai_addr = (struct sockaddr *)(void *)(ai + 1);
1366 memset(ai->ai_addr, 0, (size_t)afd->a_socklen);
1367 ai->ai_addr->sa_len = afd->a_socklen;
1368 ai->ai_addrlen = afd->a_socklen;
1369 ai->ai_addr->sa_family = ai->ai_family = afd->a_af;
1370 p = (char *)(void *)(ai->ai_addr);
1373 memcpy(p + afd->a_off, &faith_prefix, (size_t)afd->a_addrlen);
1376 memcpy(p + afd->a_off, addr, (size_t)afd->a_addrlen);
1380 /* XXX need to malloc() the same way we do from other functions! */
1381 static struct addrinfo *
1382 copy_ai(const struct addrinfo *pai)
1384 struct addrinfo *ai;
1387 l = sizeof(*ai) + pai->ai_addrlen;
1388 if ((ai = (struct addrinfo *)malloc(l)) == NULL)
1391 memcpy(ai, pai, sizeof(*ai));
1392 ai->ai_addr = (struct sockaddr *)(void *)(ai + 1);
1393 memcpy(ai->ai_addr, pai->ai_addr, pai->ai_addrlen);
1395 if (pai->ai_canonname) {
1396 l = strlen(pai->ai_canonname) + 1;
1397 if ((ai->ai_canonname = malloc(l)) == NULL) {
1401 strlcpy(ai->ai_canonname, pai->ai_canonname, l);
1403 /* just to make sure */
1404 ai->ai_canonname = NULL;
1413 get_portmatch(const struct addrinfo *ai, const char *servname)
1416 /* get_port does not touch first argument when matchonly == 1. */
1417 /* LINTED const cast */
1418 return get_port((struct addrinfo *)ai, servname, 1);
1422 get_port(struct addrinfo *ai, const char *servname, int matchonly)
1429 if (servname == NULL)
1431 switch (ai->ai_family) {
1441 switch (ai->ai_socktype) {
1446 case SOCK_SEQPACKET:
1450 switch (ai->ai_family) {
1463 return EAI_SOCKTYPE;
1466 error = str2number(servname, &port);
1470 if (port < 0 || port > 65535)
1474 if (ai->ai_flags & AI_NUMERICSERV)
1477 switch (ai->ai_protocol) {
1492 if ((sp = getservbyname(servname, proto)) == NULL)
1498 switch (ai->ai_family) {
1500 ((struct sockaddr_in *)(void *)
1501 ai->ai_addr)->sin_port = port;
1505 ((struct sockaddr_in6 *)(void *)
1506 ai->ai_addr)->sin6_port = port;
1515 static const struct afd *
1518 const struct afd *afd;
1520 if (af == PF_UNSPEC)
1522 for (afd = afdl; afd->a_af; afd++) {
1523 if (afd->a_af == af)
1530 * post-2553: AI_ADDRCONFIG check. Determines which address families are
1531 * configured on the local system and correlates with pai->ai_family value.
1532 * If an address family is not configured on the system, it will not be
1533 * queried for. For this purpose, loopback addresses are not considered
1534 * configured addresses.
1536 * XXX PF_UNSPEC -> PF_INET6 + PF_INET mapping needs to be in sync with
1540 addrconfig(struct addrinfo *pai)
1542 struct ifaddrs *ifaddrs, *ifa;
1543 int seen_inet = 0, seen_inet6 = 0;
1545 if (getifaddrs(&ifaddrs) != 0)
1548 for (ifa = ifaddrs; ifa != NULL; ifa = ifa->ifa_next) {
1549 if (ifa->ifa_addr == NULL || (ifa->ifa_flags & IFF_UP) == 0)
1551 if ((ifa->ifa_flags & IFT_LOOP) != 0)
1553 switch (ifa->ifa_addr->sa_family) {
1559 if (!seen_inet6 && !is_ifdisabled(ifa->ifa_name))
1565 freeifaddrs(ifaddrs);
1567 switch(pai->ai_family) {
1573 if (seen_inet == seen_inet6)
1575 pai->ai_family = seen_inet ? AF_INET : AF_INET6;
1583 is_ifdisabled(char *name)
1585 struct in6_ndireq nd;
1588 if ((fd = _socket(AF_INET6, SOCK_DGRAM, 0)) < 0)
1590 memset(&nd, 0, sizeof(nd));
1591 strlcpy(nd.ifname, name, sizeof(nd.ifname));
1592 if (_ioctl(fd, SIOCGIFINFO_IN6, &nd) < 0) {
1597 return ((nd.ndi.flags & ND6_IFF_IFDISABLED) != 0);
1600 /* convert a string to a scope identifier. XXX: IPv6 specific */
1602 ip6_str2scopeid(char *scope, struct sockaddr_in6 *sin6, u_int32_t *scopeid)
1605 struct in6_addr *a6;
1608 a6 = &sin6->sin6_addr;
1610 /* empty scopeid portion is invalid */
1614 if (IN6_IS_ADDR_LINKLOCAL(a6) || IN6_IS_ADDR_MC_LINKLOCAL(a6) ||
1615 IN6_IS_ADDR_MC_NODELOCAL(a6)) {
1617 * We currently assume a one-to-one mapping between links
1618 * and interfaces, so we simply use interface indices for
1619 * like-local scopes.
1621 *scopeid = if_nametoindex(scope);
1627 /* still unclear about literal, allow numeric only - placeholder */
1628 if (IN6_IS_ADDR_SITELOCAL(a6) || IN6_IS_ADDR_MC_SITELOCAL(a6))
1630 if (IN6_IS_ADDR_MC_ORGLOCAL(a6))
1633 goto trynumeric; /* global */
1635 /* try to convert to a numeric id as a last resort */
1638 lscopeid = strtoul(scope, &ep, 10);
1639 *scopeid = (u_int32_t)(lscopeid & 0xffffffffUL);
1640 if (errno == 0 && ep && *ep == '\0' && *scopeid == lscopeid)
1650 addrinfo_id_func(char *buffer, size_t *buffer_size, va_list ap,
1656 const int op_id = 0; /* identifies the getaddrinfo for the cache */
1658 struct addrinfo *hints;
1661 int ai_flags, ai_family, ai_socktype, ai_protocol;
1662 size_t desired_size, size;
1664 statp = __res_state();
1665 res_options = statp->options & (RES_RECURSE | RES_DEFNAMES |
1666 RES_DNSRCH | RES_NOALIASES | RES_USE_INET6);
1668 hostname = va_arg(ap, char *);
1669 hints = va_arg(ap, struct addrinfo *);
1671 desired_size = sizeof(res_options) + sizeof(int) + sizeof(int) * 4;
1672 if (hostname != NULL) {
1673 size = strlen(hostname);
1674 desired_size += size + 1;
1678 if (desired_size > *buffer_size) {
1679 *buffer_size = desired_size;
1684 ai_flags = ai_family = ai_socktype = ai_protocol = 0;
1686 ai_flags = hints->ai_flags;
1687 ai_family = hints->ai_family;
1688 ai_socktype = hints->ai_socktype;
1689 ai_protocol = hints->ai_protocol;
1693 memcpy(p, &res_options, sizeof(res_options));
1694 p += sizeof(res_options);
1696 memcpy(p, &op_id, sizeof(int));
1699 memcpy(p, &ai_flags, sizeof(int));
1702 memcpy(p, &ai_family, sizeof(int));
1705 memcpy(p, &ai_socktype, sizeof(int));
1708 memcpy(p, &ai_protocol, sizeof(int));
1711 if (hostname != NULL)
1712 memcpy(p, hostname, size);
1714 *buffer_size = desired_size;
1715 return (NS_SUCCESS);
1719 addrinfo_marshal_func(char *buffer, size_t *buffer_size, void *retval,
1720 va_list ap, void *cache_mdata)
1722 struct addrinfo *ai, *cai;
1724 size_t desired_size, size, ai_size;
1726 ai = *((struct addrinfo **)retval);
1728 desired_size = sizeof(size_t);
1730 for (cai = ai; cai != NULL; cai = cai->ai_next) {
1731 desired_size += sizeof(struct addrinfo) + cai->ai_addrlen;
1732 if (cai->ai_canonname != NULL)
1733 desired_size += sizeof(size_t) +
1734 strlen(cai->ai_canonname);
1738 if (desired_size > *buffer_size) {
1739 /* this assignment is here for future use */
1741 *buffer_size = desired_size;
1745 memset(buffer, 0, desired_size);
1748 memcpy(p, &ai_size, sizeof(size_t));
1749 p += sizeof(size_t);
1750 for (cai = ai; cai != NULL; cai = cai->ai_next) {
1751 memcpy(p, cai, sizeof(struct addrinfo));
1752 p += sizeof(struct addrinfo);
1754 memcpy(p, cai->ai_addr, cai->ai_addrlen);
1755 p += cai->ai_addrlen;
1757 if (cai->ai_canonname != NULL) {
1758 size = strlen(cai->ai_canonname);
1759 memcpy(p, &size, sizeof(size_t));
1760 p += sizeof(size_t);
1762 memcpy(p, cai->ai_canonname, size);
1767 return (NS_SUCCESS);
1771 addrinfo_unmarshal_func(char *buffer, size_t buffer_size, void *retval,
1772 va_list ap, void *cache_mdata)
1774 struct addrinfo new_ai, *result, *sentinel, *lasts;
1777 size_t ai_size, ai_i, size;
1780 memcpy(&ai_size, p, sizeof(size_t));
1781 p += sizeof(size_t);
1785 for (ai_i = 0; ai_i < ai_size; ++ai_i) {
1786 memcpy(&new_ai, p, sizeof(struct addrinfo));
1787 p += sizeof(struct addrinfo);
1788 size = new_ai.ai_addrlen + sizeof(struct addrinfo) +
1791 sentinel = (struct addrinfo *)malloc(size);
1792 memset(sentinel, 0, size);
1794 memcpy(sentinel, &new_ai, sizeof(struct addrinfo));
1795 sentinel->ai_addr = (struct sockaddr *)_ALIGN((char *)sentinel +
1796 sizeof(struct addrinfo));
1798 memcpy(sentinel->ai_addr, p, new_ai.ai_addrlen);
1799 p += new_ai.ai_addrlen;
1801 if (new_ai.ai_canonname != NULL) {
1802 memcpy(&size, p, sizeof(size_t));
1803 p += sizeof(size_t);
1805 sentinel->ai_canonname = (char *)malloc(size + 1);
1806 memset(sentinel->ai_canonname, 0, size + 1);
1808 memcpy(sentinel->ai_canonname, p, size);
1812 if (result == NULL) {
1816 lasts->ai_next = sentinel;
1821 *((struct addrinfo **)retval) = result;
1822 return (NS_SUCCESS);
1824 #endif /* NS_CACHING */
1827 * FQDN hostname, DNS lookup
1830 explore_fqdn(const struct addrinfo *pai, const char *hostname,
1831 const char *servname, struct addrinfo **res)
1833 struct addrinfo *result;
1834 struct addrinfo *cur;
1838 static const nss_cache_info cache_info =
1839 NS_COMMON_CACHE_INFO_INITIALIZER(
1840 hosts, NULL, addrinfo_id_func, addrinfo_marshal_func,
1841 addrinfo_unmarshal_func);
1843 static const ns_dtab dtab[] = {
1844 NS_FILES_CB(_files_getaddrinfo, NULL)
1845 { NSSRC_DNS, _dns_getaddrinfo, NULL }, /* force -DHESIOD */
1846 NS_NIS_CB(_yp_getaddrinfo, NULL)
1848 NS_CACHE_CB(&cache_info)
1856 * if the servname does not match socktype/protocol, ignore it.
1858 if (get_portmatch(pai, servname) != 0)
1861 switch (_nsdispatch(&result, dtab, NSDB_HOSTS, "getaddrinfo",
1862 default_dns_files, hostname, pai)) {
1874 for (cur = result; cur; cur = cur->ai_next) {
1875 GET_PORT(cur, servname);
1876 /* canonname should be filled already */
1887 freeaddrinfo(result);
1892 static const char AskedForGot[] =
1893 "gethostby*.getanswer: asked for \"%s\", got \"%s\"";
1896 static struct addrinfo *
1897 getanswer(const querybuf *answer, int anslen, const char *qname, int qtype,
1898 const struct addrinfo *pai, res_state res)
1900 struct addrinfo sentinel, *cur;
1902 const struct afd *afd;
1909 int type, class, ancount, qdcount;
1910 int haveanswer, had_error;
1911 char tbuf[MAXDNAME];
1912 int (*name_ok)(const char *);
1913 char hostbuf[8*1024];
1915 memset(&sentinel, 0, sizeof(sentinel));
1919 eom = answer->buf + anslen;
1923 case T_ANY: /*use T_ANY only for T_A/T_AAAA lookup*/
1927 return (NULL); /* XXX should be abort(); */
1930 * find first satisfactory answer
1933 ancount = ntohs(hp->ancount);
1934 qdcount = ntohs(hp->qdcount);
1936 ep = hostbuf + sizeof hostbuf;
1937 cp = answer->buf + HFIXEDSZ;
1939 RES_SET_H_ERRNO(res, NO_RECOVERY);
1942 n = dn_expand(answer->buf, eom, cp, bp, ep - bp);
1943 if ((n < 0) || !(*name_ok)(bp)) {
1944 RES_SET_H_ERRNO(res, NO_RECOVERY);
1948 if (qtype == T_A || qtype == T_AAAA || qtype == T_ANY) {
1949 /* res_send() has already verified that the query name is the
1950 * same as the one we sent; this just gets the expanded name
1951 * (i.e., with the succeeding search-domain tacked on).
1953 n = strlen(bp) + 1; /* for the \0 */
1954 if (n >= MAXHOSTNAMELEN) {
1955 RES_SET_H_ERRNO(res, NO_RECOVERY);
1960 /* The qname can be abbreviated, but h_name is now absolute. */
1965 while (ancount-- > 0 && cp < eom && !had_error) {
1966 n = dn_expand(answer->buf, eom, cp, bp, ep - bp);
1967 if ((n < 0) || !(*name_ok)(bp)) {
1972 type = _getshort(cp);
1973 cp += INT16SZ; /* type */
1974 class = _getshort(cp);
1975 cp += INT16SZ + INT32SZ; /* class, TTL */
1977 cp += INT16SZ; /* len */
1978 if (class != C_IN) {
1979 /* XXX - debug? syslog? */
1981 continue; /* XXX - had_error++ ? */
1983 if ((qtype == T_A || qtype == T_AAAA || qtype == T_ANY) &&
1985 n = dn_expand(answer->buf, eom, cp, tbuf, sizeof tbuf);
1986 if ((n < 0) || !(*name_ok)(tbuf)) {
1991 /* Get canonical name. */
1992 n = strlen(tbuf) + 1; /* for the \0 */
1993 if (n > ep - bp || n >= MAXHOSTNAMELEN) {
1997 strlcpy(bp, tbuf, ep - bp);
2002 if (qtype == T_ANY) {
2003 if (!(type == T_A || type == T_AAAA)) {
2007 } else if (type != qtype) {
2009 if (type != T_KEY && type != T_SIG &&
2011 syslog(LOG_NOTICE|LOG_AUTH,
2012 "gethostby*.getanswer: asked for \"%s %s %s\", got type \"%s\"",
2013 qname, p_class(C_IN), p_type(qtype),
2017 continue; /* XXX - had_error++ ? */
2022 if (strcasecmp(canonname, bp) != 0) {
2024 syslog(LOG_NOTICE|LOG_AUTH,
2025 AskedForGot, canonname, bp);
2028 continue; /* XXX - had_error++ ? */
2030 if (type == T_A && n != INADDRSZ) {
2034 if (type == T_AAAA && n != IN6ADDRSZ) {
2038 #ifdef FILTER_V4MAPPED
2039 if (type == T_AAAA) {
2040 struct in6_addr in6;
2041 memcpy(&in6, cp, sizeof(in6));
2042 if (IN6_IS_ADDR_V4MAPPED(&in6)) {
2052 nn = strlen(bp) + 1; /* for the \0 */
2056 /* don't overwrite pai */
2058 ai.ai_family = (type == T_A) ? AF_INET : AF_INET6;
2059 afd = find_afd(ai.ai_family);
2064 cur->ai_next = get_ai(&ai, afd, (const char *)cp);
2065 if (cur->ai_next == NULL)
2067 while (cur && cur->ai_next)
2078 #if defined(RESOLVSORT)
2080 * We support only IPv4 address for backward
2081 * compatibility against gethostbyname(3).
2083 if (res->nsort && qtype == T_A) {
2084 if (addr4sort(&sentinel, res) < 0) {
2085 freeaddrinfo(sentinel.ai_next);
2086 RES_SET_H_ERRNO(res, NO_RECOVERY);
2090 #endif /*RESOLVSORT*/
2092 (void)get_canonname(pai, sentinel.ai_next, qname);
2094 (void)get_canonname(pai, sentinel.ai_next, canonname);
2095 RES_SET_H_ERRNO(res, NETDB_SUCCESS);
2096 return sentinel.ai_next;
2099 RES_SET_H_ERRNO(res, NO_RECOVERY);
2105 struct addrinfo *ai;
2110 addr4sort(struct addrinfo *sentinel, res_state res)
2112 struct addrinfo *ai;
2113 struct addr_ptr *addrs, addr;
2114 struct sockaddr_in *sin;
2121 for (ai = sentinel->ai_next; ai; ai = ai->ai_next)
2124 return 0; /* We don't need sorting. */
2125 if ((addrs = malloc(sizeof(struct addr_ptr) * naddrs)) == NULL)
2128 for (ai = sentinel->ai_next; ai; ai = ai->ai_next) {
2129 sin = (struct sockaddr_in *)ai->ai_addr;
2130 for (j = 0; (unsigned)j < res->nsort; j++) {
2131 if (res->sort_list[j].addr.s_addr ==
2132 (sin->sin_addr.s_addr & res->sort_list[j].mask))
2137 if (needsort == 0 && i > 0 && j < addrs[i - 1].aval)
2146 while (needsort < naddrs) {
2147 for (j = needsort - 1; j >= 0; j--) {
2148 if (addrs[j].aval > addrs[j+1].aval) {
2150 addrs[j] = addrs[j + 1];
2151 addrs[j + 1] = addr;
2159 for (i = 0; i < naddrs; ++i) {
2160 ai->ai_next = addrs[i].ai;
2167 #endif /*RESOLVSORT*/
2171 _dns_getaddrinfo(void *rv, void *cb_data, va_list ap)
2173 struct addrinfo *ai;
2174 querybuf *buf, *buf2;
2175 const char *hostname;
2176 const struct addrinfo *pai;
2177 struct addrinfo sentinel, *cur;
2178 struct res_target q, q2;
2181 hostname = va_arg(ap, char *);
2182 pai = va_arg(ap, const struct addrinfo *);
2184 memset(&q, 0, sizeof(q));
2185 memset(&q2, 0, sizeof(q2));
2186 memset(&sentinel, 0, sizeof(sentinel));
2189 buf = malloc(sizeof(*buf));
2191 RES_SET_H_ERRNO(res, NETDB_INTERNAL);
2194 buf2 = malloc(sizeof(*buf2));
2197 RES_SET_H_ERRNO(res, NETDB_INTERNAL);
2201 switch (pai->ai_family) {
2206 q.answer = buf->buf;
2207 q.anslen = sizeof(buf->buf);
2212 q2.answer = buf2->buf;
2213 q2.anslen = sizeof(buf2->buf);
2219 q.answer = buf->buf;
2220 q.anslen = sizeof(buf->buf);
2226 q.answer = buf->buf;
2227 q.anslen = sizeof(buf->buf);
2235 res = __res_state();
2236 if ((res->options & RES_INIT) == 0 && res_ninit(res) == -1) {
2237 RES_SET_H_ERRNO(res, NETDB_INTERNAL);
2243 if (res_searchN(hostname, &q, res) < 0) {
2250 ai = getanswer(buf2, q2.n, q2.name, q2.qtype, pai, res);
2253 while (cur && cur->ai_next)
2257 ai = getanswer(buf, q.n, q.name, q.qtype, pai, res);
2262 if (sentinel.ai_next == NULL)
2263 switch (res->res_h_errno) {
2264 case HOST_NOT_FOUND:
2271 *((struct addrinfo **)rv) = sentinel.ai_next;
2276 _sethtent(FILE **hostf)
2279 *hostf = fopen(_PATH_HOSTS, "r");
2285 _endhtent(FILE **hostf)
2288 (void) fclose(*hostf);
2293 static struct addrinfo *
2294 _gethtent(FILE **hostf, const char *name, const struct addrinfo *pai)
2297 char *cp, *tname, *cname;
2298 struct addrinfo hints, *res0, *res;
2301 char hostbuf[8*1024];
2303 if (!*hostf && !(*hostf = fopen(_PATH_HOSTS, "r")))
2306 if (!(p = fgets(hostbuf, sizeof hostbuf, *hostf)))
2310 cp = strpbrk(p, "#\n");
2313 if (!(cp = strpbrk(p, " \t")))
2318 /* if this is not something we're looking for, skip it. */
2320 if (*cp == ' ' || *cp == '\t') {
2327 if ((cp = strpbrk(cp, " \t")) != NULL)
2329 if (strcasecmp(name, tname) == 0)
2335 /* we should not glob socktype/protocol here */
2336 memset(&hints, 0, sizeof(hints));
2337 hints.ai_family = pai->ai_family;
2338 hints.ai_socktype = SOCK_DGRAM;
2339 hints.ai_protocol = 0;
2340 hints.ai_flags = AI_NUMERICHOST;
2341 error = getaddrinfo(addr, "0", &hints, &res0);
2344 #ifdef FILTER_V4MAPPED
2345 /* XXX should check all items in the chain */
2346 if (res0->ai_family == AF_INET6 &&
2347 IN6_IS_ADDR_V4MAPPED(&((struct sockaddr_in6 *)res0->ai_addr)->sin6_addr)) {
2352 for (res = res0; res; res = res->ai_next) {
2354 res->ai_flags = pai->ai_flags;
2355 res->ai_socktype = pai->ai_socktype;
2356 res->ai_protocol = pai->ai_protocol;
2358 if (pai->ai_flags & AI_CANONNAME) {
2359 if (get_canonname(pai, res, cname) != 0) {
2370 _files_getaddrinfo(void *rv, void *cb_data, va_list ap)
2373 const struct addrinfo *pai;
2374 struct addrinfo sentinel, *cur;
2378 name = va_arg(ap, char *);
2379 pai = va_arg(ap, struct addrinfo *);
2381 memset(&sentinel, 0, sizeof(sentinel));
2385 while ((p = _gethtent(&hostf, name, pai)) != NULL) {
2387 while (cur && cur->ai_next)
2392 *((struct addrinfo **)rv) = sentinel.ai_next;
2393 if (sentinel.ai_next == NULL)
2400 static struct addrinfo *
2401 _yphostent(char *line, const struct addrinfo *pai)
2403 struct addrinfo sentinel, *cur;
2404 struct addrinfo hints, *res, *res0;
2407 const char *addr, *canonname;
2411 addr = canonname = NULL;
2413 memset(&sentinel, 0, sizeof(sentinel));
2417 /* terminate line */
2418 cp = strchr(p, '\n');
2425 cp = strpbrk(p, " \t");
2427 if (canonname == NULL)
2437 if (*cp == ' ' || *cp == '\t') {
2443 if ((cp = strpbrk(cp, " \t")) != NULL)
2448 hints.ai_flags = AI_NUMERICHOST;
2449 error = getaddrinfo(addr, NULL, &hints, &res0);
2451 for (res = res0; res; res = res->ai_next) {
2453 res->ai_flags = pai->ai_flags;
2455 if (pai->ai_flags & AI_CANONNAME)
2456 (void)get_canonname(pai, res, canonname);
2461 cur->ai_next = res0;
2462 while (cur && cur->ai_next)
2472 return sentinel.ai_next;
2477 _yp_getaddrinfo(void *rv, void *cb_data, va_list ap)
2479 struct addrinfo sentinel, *cur;
2480 struct addrinfo *ai = NULL;
2484 const struct addrinfo *pai;
2487 if (_yp_check(&ypdomain) == 0)
2490 name = va_arg(ap, char *);
2491 pai = va_arg(ap, const struct addrinfo *);
2493 memset(&sentinel, 0, sizeof(sentinel));
2496 /* hosts.byname is only for IPv4 (Solaris8) */
2497 if (pai->ai_family == PF_UNSPEC || pai->ai_family == PF_INET) {
2498 r = yp_match(ypdomain, "hosts.byname", name,
2499 (int)strlen(name), &ypbuf, &ypbuflen);
2501 struct addrinfo ai4;
2504 ai4.ai_family = AF_INET;
2505 ai = _yphostent(ypbuf, &ai4);
2508 while (cur && cur->ai_next)
2515 /* ipnodes.byname can hold both IPv4/v6 */
2516 r = yp_match(ypdomain, "ipnodes.byname", name,
2517 (int)strlen(name), &ypbuf, &ypbuflen);
2519 ai = _yphostent(ypbuf, pai);
2525 if (sentinel.ai_next == NULL) {
2526 RES_SET_H_ERRNO(__res_state(), HOST_NOT_FOUND);
2529 *((struct addrinfo **)rv) = sentinel.ai_next;
2534 /* resolver logic */
2537 * Formulate a normal query, send, and await answer.
2538 * Returned answer is placed in supplied buffer "answer".
2539 * Perform preliminary check of answer, returning success only
2540 * if no error is indicated and the answer count is nonzero.
2541 * Return the size of the response on success, -1 on error.
2542 * Error number is left in h_errno.
2544 * Caller must parse answer and determine whether it answers the question.
2547 res_queryN(const char *name, struct res_target *target, res_state res)
2553 struct res_target *t;
2560 buf = malloc(MAXPACKET);
2562 RES_SET_H_ERRNO(res, NETDB_INTERNAL);
2566 for (t = target; t; t = t->next) {
2571 hp = (HEADER *)(void *)t->answer;
2573 /* make it easier... */
2579 oflags = res->_flags;
2582 hp->rcode = NOERROR; /* default */
2585 if (res->options & RES_DEBUG)
2586 printf(";; res_query(%s, %d, %d)\n", name, class, type);
2589 n = res_nmkquery(res, QUERY, name, class, type, NULL, 0, NULL,
2591 if (n > 0 && (res->_flags & RES_F_EDNS0ERR) == 0 &&
2592 (res->options & (RES_USE_EDNS0|RES_USE_DNSSEC)) != 0U)
2593 n = res_nopt(res, n, buf, MAXPACKET, anslen);
2596 if (res->options & RES_DEBUG)
2597 printf(";; res_query: mkquery failed\n");
2600 RES_SET_H_ERRNO(res, NO_RECOVERY);
2603 n = res_nsend(res, buf, n, answer, anslen);
2606 * if the query choked with EDNS0, retry
2609 if ((res->options & (RES_USE_EDNS0|RES_USE_DNSSEC))
2611 ((oflags ^ res->_flags) & RES_F_EDNS0ERR) != 0) {
2612 res->_flags |= RES_F_EDNS0ERR;
2613 if (res->options & RES_DEBUG)
2614 printf(";; res_nquery: retry without EDNS0\n");
2617 rcode = hp->rcode; /* record most recent error */
2619 if (res->options & RES_DEBUG)
2620 printf(";; res_query: send error\n");
2626 hp->rcode = FORMERR; /* XXX not very informative */
2627 if (hp->rcode != NOERROR || ntohs(hp->ancount) == 0) {
2628 rcode = hp->rcode; /* record most recent error */
2630 if (res->options & RES_DEBUG)
2631 printf(";; rcode = %u, ancount=%u\n", hp->rcode,
2632 ntohs(hp->ancount));
2637 ancount += ntohs(hp->ancount);
2647 RES_SET_H_ERRNO(res, HOST_NOT_FOUND);
2650 RES_SET_H_ERRNO(res, TRY_AGAIN);
2653 RES_SET_H_ERRNO(res, NO_DATA);
2659 RES_SET_H_ERRNO(res, NO_RECOVERY);
2668 * Formulate a normal query, send, and retrieve answer in supplied buffer.
2669 * Return the size of the response on success, -1 on error.
2670 * If enabled, implement search rules until answer or unrecoverable failure
2671 * is detected. Error code, if any, is left in h_errno.
2674 res_searchN(const char *name, struct res_target *target, res_state res)
2676 const char *cp, * const *domain;
2677 HEADER *hp = (HEADER *)(void *)target->answer; /*XXX*/
2679 int trailing_dot, ret, saved_herrno;
2680 int got_nodata = 0, got_servfail = 0, root_on_list = 0;
2681 int tried_as_is = 0;
2683 char abuf[MAXDNAME];
2686 RES_SET_H_ERRNO(res, HOST_NOT_FOUND); /* default, if we never query */
2688 for (cp = name; *cp; cp++)
2689 dots += (*cp == '.');
2691 if (cp > name && *--cp == '.')
2695 * if there aren't any dots, it could be a user-level alias
2698 (cp = res_hostalias(res, name, abuf, sizeof(abuf))) != NULL)
2699 return (res_queryN(cp, target, res));
2702 * If there are enough dots in the name, let's just give it a
2703 * try 'as is'. The threshold can be set with the "ndots" option.
2704 * Also, query 'as is', if there is a trailing dot in the name.
2707 if (dots >= res->ndots || trailing_dot) {
2708 ret = res_querydomainN(name, NULL, target, res);
2709 if (ret > 0 || trailing_dot)
2711 if (errno == ECONNREFUSED) {
2712 RES_SET_H_ERRNO(res, TRY_AGAIN);
2715 switch (res->res_h_errno) {
2717 case HOST_NOT_FOUND:
2720 if (hp->rcode == SERVFAIL)
2726 saved_herrno = res->res_h_errno;
2731 * We do at least one level of search if
2732 * - there is no dot and RES_DEFNAME is set, or
2733 * - there is at least one dot, there is no trailing dot,
2734 * and RES_DNSRCH is set.
2736 if ((!dots && (res->options & RES_DEFNAMES)) ||
2737 (dots && !trailing_dot && (res->options & RES_DNSRCH))) {
2740 for (domain = (const char * const *)res->dnsrch;
2745 if (domain[0][0] == '\0' ||
2746 (domain[0][0] == '.' && domain[0][1] == '\0'))
2749 if (root_on_list && tried_as_is)
2752 ret = res_querydomainN(name, *domain, target, res);
2757 * If no server present, give up.
2758 * If name isn't found in this domain,
2759 * keep trying higher domains in the search list
2760 * (if that's enabled).
2761 * On a NO_DATA error, keep trying, otherwise
2762 * a wildcard entry of another type could keep us
2763 * from finding this entry higher in the domain.
2764 * If we get some other error (negative answer or
2765 * server failure), then stop searching up,
2766 * but try the input name below in case it's
2769 if (errno == ECONNREFUSED) {
2770 RES_SET_H_ERRNO(res, TRY_AGAIN);
2774 switch (res->res_h_errno) {
2778 case HOST_NOT_FOUND:
2783 if (hp->rcode == SERVFAIL) {
2784 /* try next search element, if any */
2789 /* anything else implies that we're done */
2793 * if we got here for some reason other than DNSRCH,
2794 * we only wanted one iteration of the loop, so stop.
2796 if (!(res->options & RES_DNSRCH))
2801 switch (res->res_h_errno) {
2803 case HOST_NOT_FOUND:
2806 if (hp->rcode == SERVFAIL)
2814 * If the query has not already been tried as is then try it
2815 * unless RES_NOTLDQUERY is set and there were no dots.
2817 if ((dots || !searched || !(res->options & RES_NOTLDQUERY)) &&
2818 !(tried_as_is || root_on_list)) {
2819 ret = res_querydomainN(name, NULL, target, res);
2825 * if we got here, we didn't satisfy the search.
2826 * if we did an initial full query, return that query's h_errno
2827 * (note that we wouldn't be here if that query had succeeded).
2828 * else if we ever got a nodata, send that back as the reason.
2829 * else send back meaningless h_errno, that being the one from
2830 * the last DNSRCH we did.
2833 if (saved_herrno != -1)
2834 RES_SET_H_ERRNO(res, saved_herrno);
2835 else if (got_nodata)
2836 RES_SET_H_ERRNO(res, NO_DATA);
2837 else if (got_servfail)
2838 RES_SET_H_ERRNO(res, TRY_AGAIN);
2843 * Perform a call on res_query on the concatenation of name and domain,
2844 * removing a trailing dot from name if domain is NULL.
2847 res_querydomainN(const char *name, const char *domain,
2848 struct res_target *target, res_state res)
2850 char nbuf[MAXDNAME];
2851 const char *longname = nbuf;
2855 if (res->options & RES_DEBUG)
2856 printf(";; res_querydomain(%s, %s)\n",
2857 name, domain?domain:"<Nil>");
2859 if (domain == NULL) {
2861 * Check for trailing '.';
2862 * copy without '.' if present.
2865 if (n >= MAXDNAME) {
2866 RES_SET_H_ERRNO(res, NO_RECOVERY);
2869 if (n > 0 && name[--n] == '.') {
2870 strncpy(nbuf, name, n);
2877 if (n + d + 1 >= MAXDNAME) {
2878 RES_SET_H_ERRNO(res, NO_RECOVERY);
2881 snprintf(nbuf, sizeof(nbuf), "%s.%s", name, domain);
2883 return (res_queryN(longname, target, res));