1 /* $KAME: getaddrinfo.c,v 1.14 2001/01/06 09:41:15 jinmei Exp $ */
2
3 /*
4 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
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.
18 *
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
29 * SUCH DAMAGE.
30 */
31
32 /*! \file
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
43 * invalid.
44 * current code - SEGV on freeaddrinfo(NULL)
45 * Note:
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
48 * getipnodebyname().
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
52 * in ai_flags?
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
62 * follows:
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);
67 *\endcode
68 * \li This will result in the following queries if the node is configure to
69 * prefer /etc/hosts than DNS:
70 *\code
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
75 *\endcode
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
80 * friends.
81 */
82
83 #include "port_before.h"
84
85 #include <sys/types.h>
86 #include <sys/param.h>
87 #include <sys/socket.h>
88
89 #include <net/if.h>
90 #include <netinet/in.h>
91
92 #include <arpa/inet.h>
93 #include <arpa/nameser.h>
94
95 #include <netdb.h>
96 #include <resolv.h>
97 #include <string.h>
98 #include <stdlib.h>
99 #include <stddef.h>
100 #include <ctype.h>
101 #include <unistd.h>
102 #include <stdio.h>
103 #include <errno.h>
104
105 #include <stdarg.h>
106
107 #include <irs.h>
108 #include <isc/assertions.h>
109
110 #include "port_after.h"
111
112 #include "irs_data.h"
113
114 #define SUCCESS 0
115 #define ANY 0
116 #define YES 1
117 #define NO 0
118
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
122 };
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
126 };
127
128 static const struct afd {
129 int a_af;
130 int a_addrlen;
131 int a_socklen;
132 int a_off;
133 const char *a_addrany;
134 const char *a_loopback;
135 int a_scoped;
136 } afdl [] = {
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},
146 };
147
148 struct explore {
149 int e_af;
150 int e_socktype;
151 int e_protocol;
152 const char *e_protostr;
153 int e_wild;
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)
157 };
158
159 static const struct explore explore[] = {
160 #if 0
161 { PF_LOCAL, 0, ANY, ANY, NULL, 0x01 },
162 #endif
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 },
170 };
171
172 #define PTON_MAX 16
173
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));
197
198 struct addrinfo *hostent2addrinfo __P((struct hostent *,
199 const struct addrinfo *));
200 struct addrinfo *addr2addrinfo __P((const struct addrinfo *,
201 const char *));
202
203 #if 0
204 static const char *ai_errlist[] = {
205 "Success",
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 */
220 };
221 #endif
222
223 /* XXX macros that make external reference is BAD. */
224
225 #define GET_AI(ai, afd, addr) \
226 do { \
227 /* external reference: pai, error, and label free */ \
228 (ai) = get_ai(pai, (afd), (addr)); \
229 if ((ai) == NULL) { \
230 error = EAI_MEMORY; \
231 goto free; \
232 } \
233 } while (/*CONSTCOND*/0)
234
235 #define GET_PORT(ai, serv) \
236 do { \
237 /* external reference: error and label free */ \
238 error = get_port((ai), (serv), 0); \
239 if (error != 0) \
240 goto free; \
241 } while (/*CONSTCOND*/0)
242
243 #define GET_CANONNAME(ai, str) \
244 do { \
245 /* external reference: pai, error and label free */ \
246 error = get_canonname(pai, (ai), (str)); \
247 if (error != 0) \
248 goto free; \
249 } while (/*CONSTCOND*/0)
250
251 #ifndef SOLARIS2
252 #define SETERROR(err) \
253 do { \
254 /* external reference: error, and label bad */ \
255 error = (err); \
256 goto bad; \
257 /*NOTREACHED*/ \
258 } while (/*CONSTCOND*/0)
259 #else
260 #define SETERROR(err) \
261 do { \
262 /* external reference: error, and label bad */ \
263 error = (err); \
264 if (error == error) \
265 goto bad; \
266 } while (/*CONSTCOND*/0)
267 #endif
268
269
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)))
274
275 #if 0 /*%< bind8 has its own version */
276 char *
277 gai_strerror(ecode)
278 int ecode;
279 {
280 if (ecode < 0 || ecode > EAI_MAX)
281 ecode = EAI_MAX;
282 return ai_errlist[ecode];
283 }
284 #endif
285
286 void
freeaddrinfo(ai)287 freeaddrinfo(ai)
288 struct addrinfo *ai;
289 {
290 struct addrinfo *next;
291
292 do {
293 next = ai->ai_next;
294 if (ai->ai_canonname)
295 free(ai->ai_canonname);
296 /* no need to free(ai->ai_addr) */
297 free(ai);
298 ai = next;
299 } while (ai);
300 }
301
302 static int
str_isnumber(p)303 str_isnumber(p)
304 const char *p;
305 {
306 char *ep;
307
308 if (*p == '\0')
309 return NO;
310 ep = NULL;
311 errno = 0;
312 (void)strtoul(p, &ep, 10);
313 if (errno == 0 && ep && *ep == '\0')
314 return YES;
315 else
316 return NO;
317 }
318
319 int
getaddrinfo(hostname,servname,hints,res)320 getaddrinfo(hostname, servname, hints, res)
321 const char *hostname, *servname;
322 const struct addrinfo *hints;
323 struct addrinfo **res;
324 {
325 struct addrinfo sentinel;
326 struct addrinfo *cur;
327 int error = 0;
328 struct addrinfo ai, ai0, *afai = NULL;
329 struct addrinfo *pai;
330 const struct explore *ex;
331
332 memset(&sentinel, 0, sizeof(sentinel));
333 cur = &sentinel;
334 pai = &ai;
335 pai->ai_flags = 0;
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)
340 /*
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.
345 */
346 pai->_ai_pad = 0;
347 #endif
348 pai->ai_addrlen = 0;
349 pai->ai_canonname = NULL;
350 pai->ai_addr = NULL;
351 pai->ai_next = NULL;
352
353 if (hostname == NULL && servname == NULL)
354 return EAI_NONAME;
355 if (hints) {
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) {
363 case PF_UNSPEC:
364 case PF_INET:
365 case PF_INET6:
366 break;
367 default:
368 SETERROR(EAI_FAMILY);
369 }
370 memcpy(pai, hints, sizeof(*pai));
371
372 #if defined(sun) && defined(_SOCKLEN_T) && defined(__sparcv9)
373 /*
374 * We need to clear _ai_pad to preserve binary
375 * compatibility. See prior comment.
376 */
377 pai->_ai_pad = 0;
378 #endif
379 /*
380 * if both socktype/protocol are specified, check if they
381 * are meaningful combination.
382 */
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)
386 continue;
387 if (ex->e_socktype == ANY)
388 continue;
389 if (ex->e_protocol == ANY)
390 continue;
391 if (pai->ai_socktype == ex->e_socktype &&
392 pai->ai_protocol != ex->e_protocol) {
393 SETERROR(EAI_BADHINTS);
394 }
395 }
396 }
397 }
398
399 /*
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
402 * occassions.
403 */
404 switch (pai->ai_flags & (AI_ALL | AI_V4MAPPED)) {
405 case AI_V4MAPPED:
406 case AI_ALL | AI_V4MAPPED:
407 if (pai->ai_family != AF_INET6)
408 pai->ai_flags &= ~(AI_ALL | AI_V4MAPPED);
409 break;
410 case AI_ALL:
411 #if 1
412 /* illegal */
413 SETERROR(EAI_BADFLAGS);
414 #else
415 pai->ai_flags &= ~(AI_ALL | AI_V4MAPPED);
416 break;
417 #endif
418 }
419
420 /*
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.
424 */
425 if (MATCH_FAMILY(pai->ai_family, PF_INET, 1)
426 #ifdef PF_INET6
427 || MATCH_FAMILY(pai->ai_family, PF_INET6, 1)
428 #endif
429 ) {
430 ai0 = *pai; /* backup *pai */
431
432 if (pai->ai_family == PF_UNSPEC) {
433 #ifdef PF_INET6
434 pai->ai_family = PF_INET6;
435 #else
436 pai->ai_family = PF_INET;
437 #endif
438 }
439 error = get_portmatch(pai, servname);
440 if (error)
441 SETERROR(error);
442
443 *pai = ai0;
444 }
445
446 ai0 = *pai;
447
448 /* NULL hostname, or numeric hostname */
449 for (ex = explore; ex->e_af >= 0; ex++) {
450 *pai = ai0;
451
452 if (!MATCH_FAMILY(pai->ai_family, ex->e_af, WILD_AF(ex)))
453 continue;
454 if (!MATCH(pai->ai_socktype, ex->e_socktype, WILD_SOCKTYPE(ex)))
455 continue;
456 if (!MATCH(pai->ai_protocol, ex->e_protocol, WILD_PROTOCOL(ex)))
457 continue;
458
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;
465
466 /*
467 * if the servname does not match socktype/protocol, ignore it.
468 */
469 if (get_portmatch(pai, servname) != 0)
470 continue;
471
472 if (hostname == NULL) {
473 /*
474 * filter out AFs that are not supported by the kernel
475 * XXX errno?
476 */
477 if (!addrconfig(pai->ai_family))
478 continue;
479 error = explore_null(pai, servname, &cur->ai_next);
480 } else
481 error = explore_numeric_scope(pai, hostname, servname,
482 &cur->ai_next);
483
484 if (error)
485 goto free;
486
487 while (cur && cur->ai_next)
488 cur = cur->ai_next;
489 }
490
491 /*
492 * XXX
493 * If numreic representation of AF1 can be interpreted as FQDN
494 * representation of AF2, we need to think again about the code below.
495 */
496 if (sentinel.ai_next)
497 goto good;
498
499 if (pai->ai_flags & AI_NUMERICHOST)
500 SETERROR(EAI_NONAME);
501 if (hostname == NULL)
502 SETERROR(EAI_NONAME);
503
504 /*
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).
509 * - otherwise,
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().
513 */
514
515 /* first, try to query DNS for all possible address families. */
516 *pai = ai0;
517 error = explore_fqdn(pai, hostname, servname, &afai);
518 if (error) {
519 if (afai != NULL)
520 freeaddrinfo(afai);
521 goto free;
522 }
523 if (afai == NULL) {
524 error = EAI_NONAME; /*%< we've had no errors. */
525 goto free;
526 }
527
528 /*
529 * we would like to prefer AF_INET6 than AF_INET, so we'll make an
530 * outer loop by AFs.
531 */
532 for (ex = explore; ex->e_af >= 0; ex++) {
533 *pai = ai0;
534
535 if (pai->ai_family == PF_UNSPEC)
536 pai->ai_family = ex->e_af;
537
538 if (!MATCH_FAMILY(pai->ai_family, ex->e_af, WILD_AF(ex)))
539 continue;
540 if (!MATCH(pai->ai_socktype, ex->e_socktype,
541 WILD_SOCKTYPE(ex))) {
542 continue;
543 }
544 if (!MATCH(pai->ai_protocol, ex->e_protocol,
545 WILD_PROTOCOL(ex))) {
546 continue;
547 }
548
549 #ifdef AI_ADDRCONFIG
550 /*
551 * If AI_ADDRCONFIG is specified, check if we are
552 * expected to return the address family or not.
553 */
554 if ((pai->ai_flags & AI_ADDRCONFIG) != 0 &&
555 !addrconfig(pai->ai_family))
556 continue;
557 #endif
558
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;
565
566 /*
567 * if the servname does not match socktype/protocol, ignore it.
568 */
569 if (get_portmatch(pai, servname) != 0)
570 continue;
571
572 if ((error = explore_copy(pai, afai, &cur->ai_next)) != 0) {
573 freeaddrinfo(afai);
574 goto free;
575 }
576
577 while (cur && cur->ai_next)
578 cur = cur->ai_next;
579 }
580
581 freeaddrinfo(afai); /*%< afai must not be NULL at this point. */
582
583 if (sentinel.ai_next) {
584 good:
585 *res = sentinel.ai_next;
586 return(SUCCESS);
587 } else {
588 /*
589 * All the process succeeded, but we've had an empty list.
590 * This can happen if the given hints do not match our
591 * candidates.
592 */
593 error = EAI_NONAME;
594 }
595
596 free:
597 bad:
598 if (sentinel.ai_next)
599 freeaddrinfo(sentinel.ai_next);
600 *res = NULL;
601 return(error);
602 }
603
604 /*%
605 * FQDN hostname, DNS lookup
606 */
607 static int
explore_fqdn(pai,hostname,servname,res)608 explore_fqdn(pai, hostname, servname, res)
609 const struct addrinfo *pai;
610 const char *hostname;
611 const char *servname;
612 struct addrinfo **res;
613 {
614 struct addrinfo *result;
615 struct addrinfo *cur;
616 struct net_data *net_data = init();
617 struct irs_ho *ho;
618 int error = 0;
619 char tmp[NS_MAXDNAME];
620 const char *cp;
621
622 INSIST(res != NULL && *res == NULL);
623
624 /*
625 * if the servname does not match socktype/protocol, ignore it.
626 */
627 if (get_portmatch(pai, servname) != 0)
628 return(0);
629
630 if (!net_data || !(ho = net_data->ho))
631 return(0);
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);
640 }
641 #endif
642 if (!strchr(hostname, '.') &&
643 (cp = res_hostalias(net_data->res, hostname,
644 tmp, sizeof(tmp))))
645 hostname = cp;
646 result = (*ho->addrinfo)(ho, hostname, pai);
647 if (!net_data->ho_stayopen) {
648 (*ho->minimize)(ho);
649 }
650 if (result == NULL) {
651 int e = h_errno;
652
653 switch(e) {
654 case NETDB_INTERNAL:
655 error = EAI_SYSTEM;
656 break;
657 case TRY_AGAIN:
658 error = EAI_AGAIN;
659 break;
660 case NO_RECOVERY:
661 error = EAI_FAIL;
662 break;
663 case HOST_NOT_FOUND:
664 case NO_DATA:
665 error = EAI_NONAME;
666 break;
667 default:
668 case NETDB_SUCCESS: /*%< should be impossible... */
669 error = EAI_NONAME;
670 break;
671 }
672 goto free;
673 }
674
675 for (cur = result; cur; cur = cur->ai_next) {
676 GET_PORT(cur, servname); /*%< XXX: redundant lookups... */
677 /* canonname should already be filled. */
678 }
679
680 *res = result;
681
682 return(0);
683
684 free:
685 if (result)
686 freeaddrinfo(result);
687 return error;
688 }
689
690 static int
explore_copy(pai,src0,res)691 explore_copy(pai, src0, res)
692 const struct addrinfo *pai; /*%< seed */
693 const struct addrinfo *src0; /*%< source */
694 struct addrinfo **res;
695 {
696 int error;
697 struct addrinfo sentinel, *cur;
698 const struct addrinfo *src;
699
700 error = 0;
701 sentinel.ai_next = NULL;
702 cur = &sentinel;
703
704 for (src = src0; src != NULL; src = src->ai_next) {
705 if (src->ai_family != pai->ai_family)
706 continue;
707
708 cur->ai_next = copy_ai(src);
709 if (!cur->ai_next) {
710 error = EAI_MEMORY;
711 goto fail;
712 }
713
714 cur->ai_next->ai_socktype = pai->ai_socktype;
715 cur->ai_next->ai_protocol = pai->ai_protocol;
716 cur = cur->ai_next;
717 }
718
719 *res = sentinel.ai_next;
720 return 0;
721
722 fail:
723 freeaddrinfo(sentinel.ai_next);
724 return error;
725 }
726
727 /*%
728 * hostname == NULL.
729 * passive socket -> anyaddr (0.0.0.0 or ::)
730 * non-passive socket -> localhost (127.0.0.1 or ::1)
731 */
732 static int
explore_null(pai,servname,res)733 explore_null(pai, servname, res)
734 const struct addrinfo *pai;
735 const char *servname;
736 struct addrinfo **res;
737 {
738 const struct afd *afd;
739 struct addrinfo *cur;
740 struct addrinfo sentinel;
741 int error;
742
743 *res = NULL;
744 sentinel.ai_next = NULL;
745 cur = &sentinel;
746
747 afd = find_afd(pai->ai_family);
748 if (afd == NULL)
749 return 0;
750
751 if (pai->ai_flags & AI_PASSIVE) {
752 GET_AI(cur->ai_next, afd, afd->a_addrany);
753 /* xxx meaningless?
754 * GET_CANONNAME(cur->ai_next, "anyaddr");
755 */
756 GET_PORT(cur->ai_next, servname);
757 } else {
758 GET_AI(cur->ai_next, afd, afd->a_loopback);
759 /* xxx meaningless?
760 * GET_CANONNAME(cur->ai_next, "localhost");
761 */
762 GET_PORT(cur->ai_next, servname);
763 }
764 cur = cur->ai_next;
765
766 *res = sentinel.ai_next;
767 return 0;
768
769 free:
770 if (sentinel.ai_next)
771 freeaddrinfo(sentinel.ai_next);
772 return error;
773 }
774
775 /*%
776 * numeric hostname
777 */
778 static int
explore_numeric(pai,hostname,servname,res)779 explore_numeric(pai, hostname, servname, res)
780 const struct addrinfo *pai;
781 const char *hostname;
782 const char *servname;
783 struct addrinfo **res;
784 {
785 const struct afd *afd;
786 struct addrinfo *cur;
787 struct addrinfo sentinel;
788 int error;
789 char pton[PTON_MAX];
790
791 *res = NULL;
792 sentinel.ai_next = NULL;
793 cur = &sentinel;
794
795 afd = find_afd(pai->ai_family);
796 if (afd == NULL)
797 return 0;
798
799 switch (afd->a_af) {
800 #if 0 /*X/Open spec*/
801 case AF_INET:
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);
807 while (cur->ai_next)
808 cur = cur->ai_next;
809 } else
810 SETERROR(EAI_FAMILY); /*xxx*/
811 }
812 break;
813 #endif
814 default:
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);
820 while (cur->ai_next)
821 cur = cur->ai_next;
822 } else
823 SETERROR(EAI_FAMILY); /*xxx*/
824 }
825 break;
826 }
827
828 *res = sentinel.ai_next;
829 return 0;
830
831 free:
832 bad:
833 if (sentinel.ai_next)
834 freeaddrinfo(sentinel.ai_next);
835 return error;
836 }
837
838 /*%
839 * numeric hostname with scope
840 */
841 static int
explore_numeric_scope(pai,hostname,servname,res)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;
847 {
848 #ifndef SCOPE_DELIMITER
849 return explore_numeric(pai, hostname, servname, res);
850 #else
851 const struct afd *afd;
852 struct addrinfo *cur;
853 int error;
854 char *cp, *hostname2 = NULL, *scope, *addr;
855 struct sockaddr_in6 *sin6;
856
857 afd = find_afd(pai->ai_family);
858 if (afd == NULL)
859 return 0;
860
861 if (!afd->a_scoped)
862 return explore_numeric(pai, hostname, servname, res);
863
864 cp = strchr(hostname, SCOPE_DELIMITER);
865 if (cp == NULL)
866 return explore_numeric(pai, hostname, servname, res);
867
868 /*
869 * Handle special case of <scoped_address><delimiter><scope id>
870 */
871 hostname2 = strdup(hostname);
872 if (hostname2 == NULL)
873 return EAI_MEMORY;
874 /* terminate at the delimiter */
875 hostname2[cp - hostname] = '\0';
876 addr = hostname2;
877 scope = cp + 1;
878
879 error = explore_numeric(pai, addr, servname, res);
880 if (error == 0) {
881 u_int32_t scopeid = 0;
882
883 for (cur = *res; cur; cur = cur->ai_next) {
884 if (cur->ai_family != AF_INET6)
885 continue;
886 sin6 = (struct sockaddr_in6 *)(void *)cur->ai_addr;
887 if (!ip6_str2scopeid(scope, sin6, &scopeid)) {
888 free(hostname2);
889 return(EAI_NONAME); /*%< XXX: is return OK? */
890 }
891 #ifdef HAVE_SIN6_SCOPE_ID
892 sin6->sin6_scope_id = scopeid;
893 #endif
894 }
895 }
896
897 free(hostname2);
898
899 return error;
900 #endif
901 }
902
903 static int
get_canonname(pai,ai,str)904 get_canonname(pai, ai, str)
905 const struct addrinfo *pai;
906 struct addrinfo *ai;
907 const char *str;
908 {
909 if ((pai->ai_flags & AI_CANONNAME) != 0) {
910 ai->ai_canonname = (char *)malloc(strlen(str) + 1);
911 if (ai->ai_canonname == NULL)
912 return EAI_MEMORY;
913 strcpy(ai->ai_canonname, str);
914 }
915 return 0;
916 }
917
918 static struct addrinfo *
get_ai(pai,afd,addr)919 get_ai(pai, afd, addr)
920 const struct addrinfo *pai;
921 const struct afd *afd;
922 const char *addr;
923 {
924 char *p;
925 struct addrinfo *ai;
926
927 ai = (struct addrinfo *)malloc(sizeof(struct addrinfo)
928 + (afd->a_socklen));
929 if (ai == NULL)
930 return NULL;
931
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);
935 #ifdef HAVE_SA_LEN
936 ai->ai_addr->sa_len = afd->a_socklen;
937 #endif
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);
942 return ai;
943 }
944
945 /* XXX need to malloc() the same way we do from other functions! */
946 static struct addrinfo *
copy_ai(pai)947 copy_ai(pai)
948 const struct addrinfo *pai;
949 {
950 struct addrinfo *ai;
951 size_t l;
952
953 l = sizeof(*ai) + pai->ai_addrlen;
954 if ((ai = (struct addrinfo *)malloc(l)) == NULL)
955 return NULL;
956 memset(ai, 0, l);
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);
960
961 if (pai->ai_canonname) {
962 l = strlen(pai->ai_canonname) + 1;
963 if ((ai->ai_canonname = malloc(l)) == NULL) {
964 free(ai);
965 return NULL;
966 }
967 strcpy(ai->ai_canonname, pai->ai_canonname); /* (checked) */
968 } else {
969 /* just to make sure */
970 ai->ai_canonname = NULL;
971 }
972
973 ai->ai_next = NULL;
974
975 return ai;
976 }
977
978 static int
get_portmatch(const struct addrinfo * ai,const char * servname)979 get_portmatch(const struct addrinfo *ai, const char *servname) {
980
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);
984 }
985
986 static int
get_port(const struct addrinfo * ai,const char * servname,int matchonly)987 get_port(const struct addrinfo *ai, const char *servname, int matchonly) {
988 const char *proto;
989 struct servent *sp;
990 int port;
991 int allownumeric;
992
993 if (servname == NULL)
994 return 0;
995 switch (ai->ai_family) {
996 case AF_INET:
997 #ifdef AF_INET6
998 case AF_INET6:
999 #endif
1000 break;
1001 default:
1002 return 0;
1003 }
1004
1005 switch (ai->ai_socktype) {
1006 case SOCK_RAW:
1007 return EAI_SERVICE;
1008 case SOCK_DGRAM:
1009 case SOCK_STREAM:
1010 allownumeric = 1;
1011 break;
1012 case ANY:
1013 switch (ai->ai_family) {
1014 case AF_INET:
1015 #ifdef AF_INET6
1016 case AF_INET6:
1017 #endif
1018 allownumeric = 1;
1019 break;
1020 default:
1021 allownumeric = 0;
1022 break;
1023 }
1024 break;
1025 default:
1026 return EAI_SOCKTYPE;
1027 }
1028
1029 if (str_isnumber(servname)) {
1030 if (!allownumeric)
1031 return EAI_SERVICE;
1032 port = atoi(servname);
1033 if (port < 0 || port > 65535)
1034 return EAI_SERVICE;
1035 port = htons(port);
1036 } else {
1037 switch (ai->ai_socktype) {
1038 case SOCK_DGRAM:
1039 proto = "udp";
1040 break;
1041 case SOCK_STREAM:
1042 proto = "tcp";
1043 break;
1044 default:
1045 proto = NULL;
1046 break;
1047 }
1048
1049 if ((sp = getservbyname(servname, proto)) == NULL)
1050 return EAI_SERVICE;
1051 port = sp->s_port;
1052 }
1053
1054 if (!matchonly) {
1055 switch (ai->ai_family) {
1056 case AF_INET:
1057 ((struct sockaddr_in *)(void *)
1058 ai->ai_addr)->sin_port = port;
1059 break;
1060 case AF_INET6:
1061 ((struct sockaddr_in6 *)(void *)
1062 ai->ai_addr)->sin6_port = port;
1063 break;
1064 }
1065 }
1066
1067 return 0;
1068 }
1069
1070 static const struct afd *
find_afd(af)1071 find_afd(af)
1072 int af;
1073 {
1074 const struct afd *afd;
1075
1076 if (af == PF_UNSPEC)
1077 return NULL;
1078 for (afd = afdl; afd->a_af; afd++) {
1079 if (afd->a_af == af)
1080 return afd;
1081 }
1082 return NULL;
1083 }
1084
1085 /*%
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.
1090 */
1091 static int
addrconfig(af)1092 addrconfig(af)
1093 int af;
1094 {
1095 int s;
1096
1097 /* XXX errno */
1098 s = socket(af, SOCK_DGRAM, 0);
1099 if (s < 0) {
1100 if (errno != EMFILE)
1101 return 0;
1102 } else
1103 close(s);
1104 return 1;
1105 }
1106
1107 /* convert a string to a scope identifier. XXX: IPv6 specific */
1108 static int
ip6_str2scopeid(char * scope,struct sockaddr_in6 * sin6,u_int32_t * scopeidp)1109 ip6_str2scopeid(char *scope, struct sockaddr_in6 *sin6,
1110 u_int32_t *scopeidp)
1111 {
1112 u_int32_t scopeid;
1113 u_long lscopeid;
1114 struct in6_addr *a6 = &sin6->sin6_addr;
1115 char *ep;
1116
1117 /* empty scopeid portion is invalid */
1118 if (*scope == '\0')
1119 return (0);
1120
1121 #ifdef USE_IFNAMELINKID
1122 if (IN6_IS_ADDR_LINKLOCAL(a6) || IN6_IS_ADDR_MC_LINKLOCAL(a6) ||
1123 IN6_IS_ADDR_MC_NODELOCAL(a6)) {
1124 /*
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.
1128 */
1129 scopeid = if_nametoindex(scope);
1130 if (scopeid == 0)
1131 goto trynumeric;
1132 *scopeidp = scopeid;
1133 return (1);
1134 }
1135 #endif
1136
1137 /* still unclear about literal, allow numeric only - placeholder */
1138 if (IN6_IS_ADDR_SITELOCAL(a6) || IN6_IS_ADDR_MC_SITELOCAL(a6))
1139 goto trynumeric;
1140 if (IN6_IS_ADDR_MC_ORGLOCAL(a6))
1141 goto trynumeric;
1142 else
1143 goto trynumeric; /*%< global */
1144 /* try to convert to a numeric id as a last resort */
1145 trynumeric:
1146 errno = 0;
1147 lscopeid = strtoul(scope, &ep, 10);
1148 scopeid = lscopeid & 0xffffffff;
1149 if (errno == 0 && ep && *ep == '\0' && scopeid == lscopeid) {
1150 *scopeidp = scopeid;
1151 return (1);
1152 } else
1153 return (0);
1154 }
1155
1156 struct addrinfo *
hostent2addrinfo(hp,pai)1157 hostent2addrinfo(hp, pai)
1158 struct hostent *hp;
1159 const struct addrinfo *pai;
1160 {
1161 int i, af, error = 0;
1162 char **aplist = NULL, *ap;
1163 struct addrinfo sentinel, *cur;
1164 const struct afd *afd;
1165
1166 af = hp->h_addrtype;
1167 if (pai->ai_family != AF_UNSPEC && af != pai->ai_family)
1168 return(NULL);
1169
1170 afd = find_afd(af);
1171 if (afd == NULL)
1172 return(NULL);
1173
1174 aplist = hp->h_addr_list;
1175
1176 memset(&sentinel, 0, sizeof(sentinel));
1177 cur = &sentinel;
1178
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)) {
1184 af = AF_INET;
1185 ap = ap + sizeof(struct in6_addr)
1186 - sizeof(struct in_addr);
1187 }
1188 afd = find_afd(af);
1189 if (afd == NULL)
1190 continue;
1191 #endif /* 0 */
1192
1193 GET_AI(cur->ai_next, afd, ap);
1194
1195 /* GET_PORT(cur->ai_next, servname); */
1196 if ((pai->ai_flags & AI_CANONNAME) != 0) {
1197 /*
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.
1201 */
1202 GET_CANONNAME(cur->ai_next, hp->h_name);
1203 }
1204 while (cur->ai_next) /*%< no need to loop, actually. */
1205 cur = cur->ai_next;
1206 continue;
1207
1208 free:
1209 if (cur->ai_next)
1210 freeaddrinfo(cur->ai_next);
1211 cur->ai_next = NULL;
1212 /* continue, without tht pointer CUR advanced. */
1213 }
1214
1215 return(sentinel.ai_next);
1216 }
1217
1218 struct addrinfo *
addr2addrinfo(pai,cp)1219 addr2addrinfo(pai, cp)
1220 const struct addrinfo *pai;
1221 const char *cp;
1222 {
1223 const struct afd *afd;
1224
1225 afd = find_afd(pai->ai_family);
1226 if (afd == NULL)
1227 return(NULL);
1228
1229 return(get_ai(pai, afd, cp));
1230 }
1231
1232 static struct net_data *
init()1233 init()
1234 {
1235 struct net_data *net_data;
1236
1237 if (!(net_data = net_data_init(NULL)))
1238 goto error;
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) {
1242 error:
1243 errno = EIO;
1244 if (net_data && net_data->res)
1245 RES_SET_H_ERRNO(net_data->res, NETDB_INTERNAL);
1246 return (NULL);
1247 }
1248
1249 (*net_data->ho->res_set)(net_data->ho, net_data->res, NULL);
1250 }
1251
1252 return (net_data);
1253 }
1254