1 /* $KAME: getaddrinfo.c,v 1.14 2001/01/06 09:41:15 jinmei Exp $ */
4 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
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8 * modification, are permitted provided that the following conditions
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14 * documentation and/or other materials provided with the distribution.
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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
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21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
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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 * Issues to be discussed:
34 *\li Thread safe-ness must be checked.
35 *\li Return values. There are nonstandard return values defined and used
36 * in the source code. This is because RFC2553 is silent about which error
37 * code must be returned for which situation.
38 *\li IPv4 classful (shortened) form. RFC2553 is silent about it. XNET 5.2
39 * says to use inet_aton() to convert IPv4 numeric to binary (allows
40 * classful form as a result).
41 * current code - disallow classful form for IPv4 (due to use of inet_pton).
42 *\li freeaddrinfo(NULL). RFC2553 is silent about it. XNET 5.2 says it is
44 * current code - SEGV on freeaddrinfo(NULL)
46 *\li We use getipnodebyname() just for thread-safeness. There's no intent
47 * to let it do PF_UNSPEC (actually we never pass PF_UNSPEC to
49 *\li The code filters out AFs that are not supported by the kernel,
50 * when globbing NULL hostname (to loopback, or wildcard). Is it the right
51 * thing to do? What is the relationship with post-RFC2553 AI_ADDRCONFIG
53 *\li (post-2553) semantics of AI_ADDRCONFIG itself is too vague.
54 * (1) what should we do against numeric hostname (2) what should we do
55 * against NULL hostname (3) what is AI_ADDRCONFIG itself. AF not ready?
56 * non-loopback address configured? global address configured?
57 * \par Additional Issue:
58 * To avoid search order issue, we have a big amount of code duplicate
59 * from gethnamaddr.c and some other places. The issues that there's no
60 * lower layer function to lookup "IPv4 or IPv6" record. Calling
61 * gethostbyname2 from getaddrinfo will end up in wrong search order, as
63 * \li The code makes use of following calls when asked to resolver with
64 * ai_family = PF_UNSPEC:
65 *\code getipnodebyname(host, AF_INET6);
66 * getipnodebyname(host, AF_INET);
68 * \li This will result in the following queries if the node is configure to
69 * prefer /etc/hosts than DNS:
71 * lookup /etc/hosts for IPv6 address
72 * lookup DNS for IPv6 address
73 * lookup /etc/hosts for IPv4 address
74 * lookup DNS for IPv4 address
76 * which may not meet people's requirement.
77 * \li The right thing to happen is to have underlying layer which does
78 * PF_UNSPEC lookup (lookup both) and return chain of addrinfos.
79 * This would result in a bit of code duplicate with _dns_ghbyname() and
83 #include "port_before.h"
85 #include <sys/types.h>
86 #include <sys/param.h>
87 #include <sys/socket.h>
90 #include <netinet/in.h>
92 #include <arpa/inet.h>
93 #include <arpa/nameser.h>
108 #include <isc/assertions.h>
110 #include "port_after.h"
112 #include "irs_data.h"
119 static const char in_addrany[] = { 0, 0, 0, 0 };
120 static const char in6_addrany[] = {
121 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
123 static const char in_loopback[] = { 127, 0, 0, 1 };
124 static const char in6_loopback[] = {
125 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1
128 static const struct afd {
133 const char *a_addrany;
134 const char *a_loopback;
137 {PF_INET6, sizeof(struct in6_addr),
138 sizeof(struct sockaddr_in6),
139 offsetof(struct sockaddr_in6, sin6_addr),
140 in6_addrany, in6_loopback, 1},
141 {PF_INET, sizeof(struct in_addr),
142 sizeof(struct sockaddr_in),
143 offsetof(struct sockaddr_in, sin_addr),
144 in_addrany, in_loopback, 0},
145 {0, 0, 0, 0, NULL, NULL, 0},
152 const char *e_protostr;
154 #define WILD_AF(ex) ((ex)->e_wild & 0x01)
155 #define WILD_SOCKTYPE(ex) ((ex)->e_wild & 0x02)
156 #define WILD_PROTOCOL(ex) ((ex)->e_wild & 0x04)
159 static const struct explore explore[] = {
161 { PF_LOCAL, 0, ANY, ANY, NULL, 0x01 },
163 { PF_INET6, SOCK_DGRAM, IPPROTO_UDP, "udp", 0x07 },
164 { PF_INET6, SOCK_STREAM, IPPROTO_TCP, "tcp", 0x07 },
165 { PF_INET6, SOCK_RAW, ANY, NULL, 0x05 },
166 { PF_INET, SOCK_DGRAM, IPPROTO_UDP, "udp", 0x07 },
167 { PF_INET, SOCK_STREAM, IPPROTO_TCP, "tcp", 0x07 },
168 { PF_INET, SOCK_RAW, ANY, NULL, 0x05 },
169 { -1, 0, 0, NULL, 0 },
174 static int str_isnumber __P((const char *));
175 static int explore_fqdn __P((const struct addrinfo *, const char *,
176 const char *, struct addrinfo **));
177 static int explore_copy __P((const struct addrinfo *, const struct addrinfo *,
178 struct addrinfo **));
179 static int explore_null __P((const struct addrinfo *,
180 const char *, struct addrinfo **));
181 static int explore_numeric __P((const struct addrinfo *, const char *,
182 const char *, struct addrinfo **));
183 static int explore_numeric_scope __P((const struct addrinfo *, const char *,
184 const char *, struct addrinfo **));
185 static int get_canonname __P((const struct addrinfo *,
186 struct addrinfo *, const char *));
187 static struct addrinfo *get_ai __P((const struct addrinfo *,
188 const struct afd *, const char *));
189 static struct addrinfo *copy_ai __P((const struct addrinfo *));
190 static int get_portmatch __P((const struct addrinfo *, const char *));
191 static int get_port __P((const struct addrinfo *, const char *, int));
192 static const struct afd *find_afd __P((int));
193 static int addrconfig __P((int));
194 static int ip6_str2scopeid __P((char *, struct sockaddr_in6 *,
195 u_int32_t *scopeidp));
196 static struct net_data *init __P((void));
198 struct addrinfo *hostent2addrinfo __P((struct hostent *,
199 const struct addrinfo *));
200 struct addrinfo *addr2addrinfo __P((const struct addrinfo *,
204 static const char *ai_errlist[] = {
206 "Address family for hostname not supported", /*%< EAI_ADDRFAMILY */
207 "Temporary failure in name resolution", /*%< EAI_AGAIN */
208 "Invalid value for ai_flags", /*%< EAI_BADFLAGS */
209 "Non-recoverable failure in name resolution", /*%< EAI_FAIL */
210 "ai_family not supported", /*%< EAI_FAMILY */
211 "Memory allocation failure", /*%< EAI_MEMORY */
212 "No address associated with hostname", /*%< EAI_NODATA */
213 "hostname nor servname provided, or not known", /*%< EAI_NONAME */
214 "servname not supported for ai_socktype", /*%< EAI_SERVICE */
215 "ai_socktype not supported", /*%< EAI_SOCKTYPE */
216 "System error returned in errno", /*%< EAI_SYSTEM */
217 "Invalid value for hints", /*%< EAI_BADHINTS */
218 "Resolved protocol is unknown", /*%< EAI_PROTOCOL */
219 "Unknown error", /*%< EAI_MAX */
223 /* XXX macros that make external reference is BAD. */
225 #define GET_AI(ai, afd, addr) \
227 /* external reference: pai, error, and label free */ \
228 (ai) = get_ai(pai, (afd), (addr)); \
229 if ((ai) == NULL) { \
230 error = EAI_MEMORY; \
233 } while (/*CONSTCOND*/0)
235 #define GET_PORT(ai, serv) \
237 /* external reference: error and label free */ \
238 error = get_port((ai), (serv), 0); \
241 } while (/*CONSTCOND*/0)
243 #define GET_CANONNAME(ai, str) \
245 /* external reference: pai, error and label free */ \
246 error = get_canonname(pai, (ai), (str)); \
249 } while (/*CONSTCOND*/0)
252 #define SETERROR(err) \
254 /* external reference: error, and label bad */ \
258 } while (/*CONSTCOND*/0)
260 #define SETERROR(err) \
262 /* external reference: error, and label bad */ \
264 if (error == error) \
266 } while (/*CONSTCOND*/0)
270 #define MATCH_FAMILY(x, y, w) \
271 ((x) == (y) || (/*CONSTCOND*/(w) && ((x) == PF_UNSPEC || (y) == PF_UNSPEC)))
272 #define MATCH(x, y, w) \
273 ((x) == (y) || (/*CONSTCOND*/(w) && ((x) == ANY || (y) == ANY)))
275 #if 0 /*%< bind8 has its own version */
280 if (ecode < 0 || ecode > EAI_MAX)
282 return ai_errlist[ecode];
290 struct addrinfo *next;
294 if (ai->ai_canonname)
295 free(ai->ai_canonname);
296 /* no need to free(ai->ai_addr) */
312 (void)strtoul(p, &ep, 10);
313 if (errno == 0 && ep && *ep == '\0')
320 getaddrinfo(hostname, servname, hints, res)
321 const char *hostname, *servname;
322 const struct addrinfo *hints;
323 struct addrinfo **res;
325 struct addrinfo sentinel;
326 struct addrinfo *cur;
328 struct addrinfo ai, ai0, *afai = NULL;
329 struct addrinfo *pai;
330 const struct explore *ex;
332 memset(&sentinel, 0, sizeof(sentinel));
336 pai->ai_family = PF_UNSPEC;
337 pai->ai_socktype = ANY;
338 pai->ai_protocol = ANY;
339 #if defined(sun) && defined(_SOCKLEN_T) && defined(__sparcv9)
341 * clear _ai_pad to preserve binary
342 * compatibility with previously compiled 64-bit
343 * applications in a pre-SUSv3 environment by
344 * guaranteeing the upper 32-bits are empty.
349 pai->ai_canonname = NULL;
353 if (hostname == NULL && servname == NULL)
356 /* error check for hints */
357 if (hints->ai_addrlen || hints->ai_canonname ||
358 hints->ai_addr || hints->ai_next)
359 SETERROR(EAI_BADHINTS); /*%< xxx */
360 if (hints->ai_flags & ~AI_MASK)
361 SETERROR(EAI_BADFLAGS);
362 switch (hints->ai_family) {
368 SETERROR(EAI_FAMILY);
370 memcpy(pai, hints, sizeof(*pai));
372 #if defined(sun) && defined(_SOCKLEN_T) && defined(__sparcv9)
374 * We need to clear _ai_pad to preserve binary
375 * compatibility. See prior comment.
380 * if both socktype/protocol are specified, check if they
381 * are meaningful combination.
383 if (pai->ai_socktype != ANY && pai->ai_protocol != ANY) {
384 for (ex = explore; ex->e_af >= 0; ex++) {
385 if (pai->ai_family != ex->e_af)
387 if (ex->e_socktype == ANY)
389 if (ex->e_protocol == ANY)
391 if (pai->ai_socktype == ex->e_socktype &&
392 pai->ai_protocol != ex->e_protocol) {
393 SETERROR(EAI_BADHINTS);
400 * post-2553: AI_ALL and AI_V4MAPPED are effective only against
401 * AF_INET6 query. They needs to be ignored if specified in other
404 switch (pai->ai_flags & (AI_ALL | AI_V4MAPPED)) {
406 case AI_ALL | AI_V4MAPPED:
407 if (pai->ai_family != AF_INET6)
408 pai->ai_flags &= ~(AI_ALL | AI_V4MAPPED);
413 SETERROR(EAI_BADFLAGS);
415 pai->ai_flags &= ~(AI_ALL | AI_V4MAPPED);
421 * check for special cases. (1) numeric servname is disallowed if
422 * socktype/protocol are left unspecified. (2) servname is disallowed
423 * for raw and other inet{,6} sockets.
425 if (MATCH_FAMILY(pai->ai_family, PF_INET, 1)
427 || MATCH_FAMILY(pai->ai_family, PF_INET6, 1)
430 ai0 = *pai; /* backup *pai */
432 if (pai->ai_family == PF_UNSPEC) {
434 pai->ai_family = PF_INET6;
436 pai->ai_family = PF_INET;
439 error = get_portmatch(pai, servname);
448 /* NULL hostname, or numeric hostname */
449 for (ex = explore; ex->e_af >= 0; ex++) {
452 if (!MATCH_FAMILY(pai->ai_family, ex->e_af, WILD_AF(ex)))
454 if (!MATCH(pai->ai_socktype, ex->e_socktype, WILD_SOCKTYPE(ex)))
456 if (!MATCH(pai->ai_protocol, ex->e_protocol, WILD_PROTOCOL(ex)))
459 if (pai->ai_family == PF_UNSPEC)
460 pai->ai_family = ex->e_af;
461 if (pai->ai_socktype == ANY && ex->e_socktype != ANY)
462 pai->ai_socktype = ex->e_socktype;
463 if (pai->ai_protocol == ANY && ex->e_protocol != ANY)
464 pai->ai_protocol = ex->e_protocol;
467 * if the servname does not match socktype/protocol, ignore it.
469 if (get_portmatch(pai, servname) != 0)
472 if (hostname == NULL) {
474 * filter out AFs that are not supported by the kernel
477 if (!addrconfig(pai->ai_family))
479 error = explore_null(pai, servname, &cur->ai_next);
481 error = explore_numeric_scope(pai, hostname, servname,
487 while (cur && cur->ai_next)
493 * If numreic representation of AF1 can be interpreted as FQDN
494 * representation of AF2, we need to think again about the code below.
496 if (sentinel.ai_next)
499 if (pai->ai_flags & AI_NUMERICHOST)
500 SETERROR(EAI_NONAME);
501 if (hostname == NULL)
502 SETERROR(EAI_NONAME);
505 * hostname as alphabetical name.
506 * We'll make sure that
507 * - if returning addrinfo list is empty, return non-zero error
508 * value (already known one or EAI_NONAME).
510 * + if we haven't had any errors, return 0 (i.e. success).
511 * + if we've had an error, free the list and return the error.
512 * without any assumption on the behavior of explore_fqdn().
515 /* first, try to query DNS for all possible address families. */
517 error = explore_fqdn(pai, hostname, servname, &afai);
524 error = EAI_NONAME; /*%< we've had no errors. */
529 * we would like to prefer AF_INET6 than AF_INET, so we'll make an
532 for (ex = explore; ex->e_af >= 0; ex++) {
535 if (pai->ai_family == PF_UNSPEC)
536 pai->ai_family = ex->e_af;
538 if (!MATCH_FAMILY(pai->ai_family, ex->e_af, WILD_AF(ex)))
540 if (!MATCH(pai->ai_socktype, ex->e_socktype,
541 WILD_SOCKTYPE(ex))) {
544 if (!MATCH(pai->ai_protocol, ex->e_protocol,
545 WILD_PROTOCOL(ex))) {
551 * If AI_ADDRCONFIG is specified, check if we are
552 * expected to return the address family or not.
554 if ((pai->ai_flags & AI_ADDRCONFIG) != 0 &&
555 !addrconfig(pai->ai_family))
559 if (pai->ai_family == PF_UNSPEC)
560 pai->ai_family = ex->e_af;
561 if (pai->ai_socktype == ANY && ex->e_socktype != ANY)
562 pai->ai_socktype = ex->e_socktype;
563 if (pai->ai_protocol == ANY && ex->e_protocol != ANY)
564 pai->ai_protocol = ex->e_protocol;
567 * if the servname does not match socktype/protocol, ignore it.
569 if (get_portmatch(pai, servname) != 0)
572 if ((error = explore_copy(pai, afai, &cur->ai_next)) != 0) {
577 while (cur && cur->ai_next)
581 freeaddrinfo(afai); /*%< afai must not be NULL at this point. */
583 if (sentinel.ai_next) {
585 *res = sentinel.ai_next;
589 * All the process succeeded, but we've had an empty list.
590 * This can happen if the given hints do not match our
598 if (sentinel.ai_next)
599 freeaddrinfo(sentinel.ai_next);
605 * FQDN hostname, DNS lookup
608 explore_fqdn(pai, hostname, servname, res)
609 const struct addrinfo *pai;
610 const char *hostname;
611 const char *servname;
612 struct addrinfo **res;
614 struct addrinfo *result;
615 struct addrinfo *cur;
616 struct net_data *net_data = init();
619 char tmp[NS_MAXDNAME];
622 INSIST(res != NULL && *res == NULL);
625 * if the servname does not match socktype/protocol, ignore it.
627 if (get_portmatch(pai, servname) != 0)
630 if (!net_data || !(ho = net_data->ho))
632 #if 0 /*%< XXX (notyet) */
633 if (net_data->ho_stayopen && net_data->ho_last &&
634 net_data->ho_last->h_addrtype == af) {
635 if (ns_samename(name, net_data->ho_last->h_name) == 1)
636 return (net_data->ho_last);
637 for (hap = net_data->ho_last->h_aliases; hap && *hap; hap++)
638 if (ns_samename(name, *hap) == 1)
639 return (net_data->ho_last);
642 if (!strchr(hostname, '.') &&
643 (cp = res_hostalias(net_data->res, hostname,
646 result = (*ho->addrinfo)(ho, hostname, pai);
647 if (!net_data->ho_stayopen) {
650 if (result == NULL) {
668 case NETDB_SUCCESS: /*%< should be impossible... */
675 for (cur = result; cur; cur = cur->ai_next) {
676 GET_PORT(cur, servname); /*%< XXX: redundant lookups... */
677 /* canonname should already be filled. */
686 freeaddrinfo(result);
691 explore_copy(pai, src0, res)
692 const struct addrinfo *pai; /*%< seed */
693 const struct addrinfo *src0; /*%< source */
694 struct addrinfo **res;
697 struct addrinfo sentinel, *cur;
698 const struct addrinfo *src;
701 sentinel.ai_next = NULL;
704 for (src = src0; src != NULL; src = src->ai_next) {
705 if (src->ai_family != pai->ai_family)
708 cur->ai_next = copy_ai(src);
714 cur->ai_next->ai_socktype = pai->ai_socktype;
715 cur->ai_next->ai_protocol = pai->ai_protocol;
719 *res = sentinel.ai_next;
723 freeaddrinfo(sentinel.ai_next);
729 * passive socket -> anyaddr (0.0.0.0 or ::)
730 * non-passive socket -> localhost (127.0.0.1 or ::1)
733 explore_null(pai, servname, res)
734 const struct addrinfo *pai;
735 const char *servname;
736 struct addrinfo **res;
738 const struct afd *afd;
739 struct addrinfo *cur;
740 struct addrinfo sentinel;
744 sentinel.ai_next = NULL;
747 afd = find_afd(pai->ai_family);
751 if (pai->ai_flags & AI_PASSIVE) {
752 GET_AI(cur->ai_next, afd, afd->a_addrany);
754 * GET_CANONNAME(cur->ai_next, "anyaddr");
756 GET_PORT(cur->ai_next, servname);
758 GET_AI(cur->ai_next, afd, afd->a_loopback);
760 * GET_CANONNAME(cur->ai_next, "localhost");
762 GET_PORT(cur->ai_next, servname);
766 *res = sentinel.ai_next;
770 if (sentinel.ai_next)
771 freeaddrinfo(sentinel.ai_next);
779 explore_numeric(pai, hostname, servname, res)
780 const struct addrinfo *pai;
781 const char *hostname;
782 const char *servname;
783 struct addrinfo **res;
785 const struct afd *afd;
786 struct addrinfo *cur;
787 struct addrinfo sentinel;
792 sentinel.ai_next = NULL;
795 afd = find_afd(pai->ai_family);
800 #if 0 /*X/Open spec*/
802 if (inet_aton(hostname, (struct in_addr *)pton) == 1) {
803 if (pai->ai_family == afd->a_af ||
804 pai->ai_family == PF_UNSPEC /*?*/) {
805 GET_AI(cur->ai_next, afd, pton);
806 GET_PORT(cur->ai_next, servname);
810 SETERROR(EAI_FAMILY); /*xxx*/
815 if (inet_pton(afd->a_af, hostname, pton) == 1) {
816 if (pai->ai_family == afd->a_af ||
817 pai->ai_family == PF_UNSPEC /*?*/) {
818 GET_AI(cur->ai_next, afd, pton);
819 GET_PORT(cur->ai_next, servname);
823 SETERROR(EAI_FAMILY); /*xxx*/
828 *res = sentinel.ai_next;
833 if (sentinel.ai_next)
834 freeaddrinfo(sentinel.ai_next);
839 * numeric hostname with scope
842 explore_numeric_scope(pai, hostname, servname, res)
843 const struct addrinfo *pai;
844 const char *hostname;
845 const char *servname;
846 struct addrinfo **res;
848 #ifndef SCOPE_DELIMITER
849 return explore_numeric(pai, hostname, servname, res);
851 const struct afd *afd;
852 struct addrinfo *cur;
854 char *cp, *hostname2 = NULL, *scope, *addr;
855 struct sockaddr_in6 *sin6;
857 afd = find_afd(pai->ai_family);
862 return explore_numeric(pai, hostname, servname, res);
864 cp = strchr(hostname, SCOPE_DELIMITER);
866 return explore_numeric(pai, hostname, servname, res);
869 * Handle special case of <scoped_address><delimiter><scope id>
871 hostname2 = strdup(hostname);
872 if (hostname2 == NULL)
874 /* terminate at the delimiter */
875 hostname2[cp - hostname] = '\0';
879 error = explore_numeric(pai, addr, servname, res);
881 u_int32_t scopeid = 0;
883 for (cur = *res; cur; cur = cur->ai_next) {
884 if (cur->ai_family != AF_INET6)
886 sin6 = (struct sockaddr_in6 *)(void *)cur->ai_addr;
887 if (!ip6_str2scopeid(scope, sin6, &scopeid)) {
889 return(EAI_NONAME); /*%< XXX: is return OK? */
891 #ifdef HAVE_SIN6_SCOPE_ID
892 sin6->sin6_scope_id = scopeid;
904 get_canonname(pai, ai, str)
905 const struct addrinfo *pai;
909 if ((pai->ai_flags & AI_CANONNAME) != 0) {
910 ai->ai_canonname = (char *)malloc(strlen(str) + 1);
911 if (ai->ai_canonname == NULL)
913 strcpy(ai->ai_canonname, str);
918 static struct addrinfo *
919 get_ai(pai, afd, addr)
920 const struct addrinfo *pai;
921 const struct afd *afd;
927 ai = (struct addrinfo *)malloc(sizeof(struct addrinfo)
932 memcpy(ai, pai, sizeof(struct addrinfo));
933 ai->ai_addr = (struct sockaddr *)(void *)(ai + 1);
934 memset(ai->ai_addr, 0, (size_t)afd->a_socklen);
936 ai->ai_addr->sa_len = afd->a_socklen;
938 ai->ai_addrlen = afd->a_socklen;
939 ai->ai_addr->sa_family = ai->ai_family = afd->a_af;
940 p = (char *)(void *)(ai->ai_addr);
941 memcpy(p + afd->a_off, addr, (size_t)afd->a_addrlen);
945 /* XXX need to malloc() the same way we do from other functions! */
946 static struct addrinfo *
948 const struct addrinfo *pai;
953 l = sizeof(*ai) + pai->ai_addrlen;
954 if ((ai = (struct addrinfo *)malloc(l)) == NULL)
957 memcpy(ai, pai, sizeof(*ai));
958 ai->ai_addr = (struct sockaddr *)(void *)(ai + 1);
959 memcpy(ai->ai_addr, pai->ai_addr, pai->ai_addrlen);
961 if (pai->ai_canonname) {
962 l = strlen(pai->ai_canonname) + 1;
963 if ((ai->ai_canonname = malloc(l)) == NULL) {
967 strcpy(ai->ai_canonname, pai->ai_canonname); /* (checked) */
969 /* just to make sure */
970 ai->ai_canonname = NULL;
979 get_portmatch(const struct addrinfo *ai, const char *servname) {
981 /* get_port does not touch first argument. when matchonly == 1. */
982 /* LINTED const cast */
983 return get_port((const struct addrinfo *)ai, servname, 1);
987 get_port(const struct addrinfo *ai, const char *servname, int matchonly) {
993 if (servname == NULL)
995 switch (ai->ai_family) {
1005 switch (ai->ai_socktype) {
1013 switch (ai->ai_family) {
1026 return EAI_SOCKTYPE;
1029 if (str_isnumber(servname)) {
1032 port = atoi(servname);
1033 if (port < 0 || port > 65535)
1037 switch (ai->ai_socktype) {
1049 if ((sp = getservbyname(servname, proto)) == NULL)
1055 switch (ai->ai_family) {
1057 ((struct sockaddr_in *)(void *)
1058 ai->ai_addr)->sin_port = port;
1061 ((struct sockaddr_in6 *)(void *)
1062 ai->ai_addr)->sin6_port = port;
1070 static const struct afd *
1074 const struct afd *afd;
1076 if (af == PF_UNSPEC)
1078 for (afd = afdl; afd->a_af; afd++) {
1079 if (afd->a_af == af)
1086 * post-2553: AI_ADDRCONFIG check. if we use getipnodeby* as backend, backend
1087 * will take care of it.
1088 * the semantics of AI_ADDRCONFIG is not defined well. we are not sure
1089 * if the code is right or not.
1098 s = socket(af, SOCK_DGRAM, 0);
1100 if (errno != EMFILE)
1107 /* convert a string to a scope identifier. XXX: IPv6 specific */
1109 ip6_str2scopeid(char *scope, struct sockaddr_in6 *sin6,
1110 u_int32_t *scopeidp)
1114 struct in6_addr *a6 = &sin6->sin6_addr;
1117 /* empty scopeid portion is invalid */
1121 #ifdef USE_IFNAMELINKID
1122 if (IN6_IS_ADDR_LINKLOCAL(a6) || IN6_IS_ADDR_MC_LINKLOCAL(a6) ||
1123 IN6_IS_ADDR_MC_NODELOCAL(a6)) {
1125 * Using interface names as link indices can be allowed
1126 * only when we can assume a one-to-one mappings between
1127 * links and interfaces. See comments in getnameinfo.c.
1129 scopeid = if_nametoindex(scope);
1132 *scopeidp = scopeid;
1137 /* still unclear about literal, allow numeric only - placeholder */
1138 if (IN6_IS_ADDR_SITELOCAL(a6) || IN6_IS_ADDR_MC_SITELOCAL(a6))
1140 if (IN6_IS_ADDR_MC_ORGLOCAL(a6))
1143 goto trynumeric; /*%< global */
1144 /* try to convert to a numeric id as a last resort */
1147 lscopeid = strtoul(scope, &ep, 10);
1148 scopeid = lscopeid & 0xffffffff;
1149 if (errno == 0 && ep && *ep == '\0' && scopeid == lscopeid) {
1150 *scopeidp = scopeid;
1157 hostent2addrinfo(hp, pai)
1159 const struct addrinfo *pai;
1161 int i, af, error = 0;
1162 char **aplist = NULL, *ap;
1163 struct addrinfo sentinel, *cur;
1164 const struct afd *afd;
1166 af = hp->h_addrtype;
1167 if (pai->ai_family != AF_UNSPEC && af != pai->ai_family)
1174 aplist = hp->h_addr_list;
1176 memset(&sentinel, 0, sizeof(sentinel));
1179 for (i = 0; (ap = aplist[i]) != NULL; i++) {
1180 #if 0 /*%< the trick seems too much */
1181 af = hp->h_addr_list;
1182 if (af == AF_INET6 &&
1183 IN6_IS_ADDR_V4MAPPED((struct in6_addr *)ap)) {
1185 ap = ap + sizeof(struct in6_addr)
1186 - sizeof(struct in_addr);
1193 GET_AI(cur->ai_next, afd, ap);
1195 /* GET_PORT(cur->ai_next, servname); */
1196 if ((pai->ai_flags & AI_CANONNAME) != 0) {
1198 * RFC2553 says that ai_canonname will be set only for
1199 * the first element. we do it for all the elements,
1200 * just for convenience.
1202 GET_CANONNAME(cur->ai_next, hp->h_name);
1204 while (cur->ai_next) /*%< no need to loop, actually. */
1210 freeaddrinfo(cur->ai_next);
1211 cur->ai_next = NULL;
1212 /* continue, without tht pointer CUR advanced. */
1215 return(sentinel.ai_next);
1219 addr2addrinfo(pai, cp)
1220 const struct addrinfo *pai;
1223 const struct afd *afd;
1225 afd = find_afd(pai->ai_family);
1229 return(get_ai(pai, afd, cp));
1232 static struct net_data *
1235 struct net_data *net_data;
1237 if (!(net_data = net_data_init(NULL)))
1239 if (!net_data->ho) {
1240 net_data->ho = (*net_data->irs->ho_map)(net_data->irs);
1241 if (!net_data->ho || !net_data->res) {
1244 if (net_data && net_data->res)
1245 RES_SET_H_ERRNO(net_data->res, NETDB_INTERNAL);
1249 (*net_data->ho->res_set)(net_data->ho, net_data->res, NULL);