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Remove unneeded .Pp before .Rs in various manual pages.
[dragonfly.git] / lib / libc / net / getaddrinfo.c
blob7b64c10bbda947542178b834ad4e543ca59ba3c0
1 /* $FreeBSD: src/lib/libc/net/getaddrinfo.c,v 1.87 2008/02/03 19:07:55 ume Exp $ */
2 /* $DragonFly: src/lib/libc/net/getaddrinfo.c,v 1.9 2008/10/04 22:38:42 swildner Exp $ */
3 /* $KAME: getaddrinfo.c,v 1.15 2000/07/09 04:37:24 itojun Exp $ */
4
5 /*
6 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
7 * All rights reserved.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
17 * 3. Neither the name of the project nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 */
33
34 /*
35 * "#ifdef FAITH" part is local hack for supporting IPv4-v6 translator.
36 *
37 * Issues to be discussed:
38 * - Return values. There are nonstandard return values defined and used
39 * in the source code. This is because RFC2553 is silent about which error
40 * code must be returned for which situation.
41 * - freeaddrinfo(NULL). RFC2553 is silent about it. XNET 5.2 says it is
42 * invalid. current code - SEGV on freeaddrinfo(NULL)
43 *
44 * Note:
45 * - The code filters out AFs that are not supported by the kernel,
46 * when globbing NULL hostname (to loopback, or wildcard). Is it the right
47 * thing to do? What is the relationship with post-RFC2553 AI_ADDRCONFIG
48 * in ai_flags?
49 * - (post-2553) semantics of AI_ADDRCONFIG itself is too vague.
50 * (1) what should we do against numeric hostname (2) what should we do
51 * against NULL hostname (3) what is AI_ADDRCONFIG itself. AF not ready?
52 * non-loopback address configured? global address configured?
53 *
54 * OS specific notes for freebsd4:
55 * - FreeBSD supported $GAI. The code does not.
56 */
57
58 #include "namespace.h"
59 #include <sys/types.h>
60 #include <sys/param.h>
61 #include <sys/socket.h>
62 #include <net/if.h>
63 #include <netinet/in.h>
64 #include <sys/queue.h>
65 #ifdef INET6
66 #include <net/if_var.h>
67 #include <sys/sysctl.h>
68 #include <sys/ioctl.h>
69 #include <netinet6/in6_var.h> /* XXX */
70 #endif
71 #include <arpa/inet.h>
72 #include <arpa/nameser.h>
73 #include <rpc/rpc.h>
74 #include <rpcsvc/yp_prot.h>
75 #include <rpcsvc/ypclnt.h>
76 #include <netdb.h>
77 #include <resolv.h>
78 #include <string.h>
79 #include <stdlib.h>
80 #include <stddef.h>
81 #include <ctype.h>
82 #include <unistd.h>
83 #include <stdio.h>
84 #include <errno.h>
85
86 #include "res_config.h"
87
88 #ifdef DEBUG
89 #include <syslog.h>
90 #endif
91
92 #include <stdarg.h>
93 #include <nsswitch.h>
94 #include "un-namespace.h"
95 #include "libc_private.h"
96 #ifdef NS_CACHING
97 #include "nscache.h"
98 #endif
99
100 #if defined(__KAME__) && defined(INET6)
101 # define FAITH
102 #endif
103
104 #define SUCCESS 0
105 #define ANY 0
106 #define YES 1
107 #define NO 0
108
109 static const char in_addrany[] = { 0, 0, 0, 0 };
110 static const char in_loopback[] = { 127, 0, 0, 1 };
111 #ifdef INET6
112 static const char in6_addrany[] = {
113 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
114 };
115 static const char in6_loopback[] = {
116 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1
117 };
118 #endif
119
120 struct policyqueue {
121 TAILQ_ENTRY(policyqueue) pc_entry;
122 #ifdef INET6
123 struct in6_addrpolicy pc_policy;
124 #endif
125 };
126 TAILQ_HEAD(policyhead, policyqueue);
127
128 static const struct afd {
129 int a_af;
130 int a_addrlen;
131 socklen_t a_socklen;
132 int a_off;
133 const char *a_addrany;
134 const char *a_loopback;
135 int a_scoped;
136 } afdl [] = {
137 #ifdef INET6
138 #define N_INET6 0
139 {PF_INET6, sizeof(struct in6_addr),
140 sizeof(struct sockaddr_in6),
141 offsetof(struct sockaddr_in6, sin6_addr),
142 in6_addrany, in6_loopback, 1},
143 #define N_INET 1
144 #else
145 #define N_INET 0
146 #endif
147 {PF_INET, sizeof(struct in_addr),
148 sizeof(struct sockaddr_in),
149 offsetof(struct sockaddr_in, sin_addr),
150 in_addrany, in_loopback, 0},
151 {0, 0, 0, 0, NULL, NULL, 0},
152 };
153
154 struct explore {
155 int e_af;
156 int e_socktype;
157 int e_protocol;
158 const char *e_protostr;
159 int e_wild;
160 #define WILD_AF(ex) ((ex)->e_wild & 0x01)
161 #define WILD_SOCKTYPE(ex) ((ex)->e_wild & 0x02)
162 #define WILD_PROTOCOL(ex) ((ex)->e_wild & 0x04)
163 };
164
165 static const struct explore explore[] = {
166 #if 0
167 { PF_LOCAL, 0, ANY, ANY, NULL, 0x01 },
168 #endif
169 #ifdef INET6
170 { PF_INET6, SOCK_DGRAM, IPPROTO_UDP, "udp", 0x07 },
171 { PF_INET6, SOCK_STREAM, IPPROTO_TCP, "tcp", 0x07 },
172 { PF_INET6, SOCK_RAW, ANY, NULL, 0x05 },
173 #endif
174 { PF_INET, SOCK_DGRAM, IPPROTO_UDP, "udp", 0x07 },
175 { PF_INET, SOCK_STREAM, IPPROTO_TCP, "tcp", 0x07 },
176 { PF_INET, SOCK_RAW, ANY, NULL, 0x05 },
177 { PF_UNSPEC, SOCK_DGRAM, IPPROTO_UDP, "udp", 0x07 },
178 { PF_UNSPEC, SOCK_STREAM, IPPROTO_TCP, "tcp", 0x07 },
179 { PF_UNSPEC, SOCK_RAW, ANY, NULL, 0x05 },
180 { -1, 0, 0, NULL, 0 },
181 };
182
183 #ifdef INET6
184 #define PTON_MAX 16
185 #else
186 #define PTON_MAX 4
187 #endif
188
189 #define AIO_SRCFLAG_DEPRECATED 0x1
190
191 struct ai_order {
192 union {
193 struct sockaddr_storage aiou_ss;
194 struct sockaddr aiou_sa;
195 } aio_src_un;
196 #define aio_srcsa aio_src_un.aiou_sa
197 u_int32_t aio_srcflag;
198 int aio_srcscope;
199 int aio_dstscope;
200 struct policyqueue *aio_srcpolicy;
201 struct policyqueue *aio_dstpolicy;
202 struct addrinfo *aio_ai;
203 int aio_matchlen;
204 };
205
206 static const ns_src default_dns_files[] = {
207 { NSSRC_FILES, NS_SUCCESS },
208 { NSSRC_DNS, NS_SUCCESS },
209 { 0 }
210 };
211
212 struct res_target {
213 struct res_target *next;
214 const char *name; /* domain name */
215 int qclass, qtype; /* class and type of query */
216 u_char *answer; /* buffer to put answer */
217 int anslen; /* size of answer buffer */
218 int n; /* result length */
219 };
220
221 #define MAXPACKET (64*1024)
222
223 typedef union {
224 HEADER hdr;
225 u_char buf[MAXPACKET];
226 } querybuf;
227
228 static int str2number(const char *, int *);
229 static int explore_null(const struct addrinfo *,
230 const char *, struct addrinfo **);
231 static int explore_numeric(const struct addrinfo *, const char *,
232 const char *, struct addrinfo **, const char *);
233 static int explore_numeric_scope(const struct addrinfo *, const char *,
234 const char *, struct addrinfo **);
235 static int get_canonname(const struct addrinfo *,
236 struct addrinfo *, const char *);
237 static struct addrinfo *get_ai(const struct addrinfo *,
238 const struct afd *, const char *);
239 static int get_portmatch(const struct addrinfo *, const char *);
240 static int get_port(struct addrinfo *, const char *, int);
241 static const struct afd *find_afd(int);
242 static int addrconfig(struct addrinfo *);
243 static void set_source(struct ai_order *, struct policyhead *);
244 static int comp_dst(const void *, const void *);
245 #ifdef INET6
246 static int ip6_str2scopeid(char *, struct sockaddr_in6 *, u_int32_t *);
247 #endif
248 static int gai_addr2scopetype(struct sockaddr *);
249
250 static int explore_fqdn(const struct addrinfo *, const char *,
251 const char *, struct addrinfo **);
252
253 static int reorder(struct addrinfo *);
254 static int get_addrselectpolicy(struct policyhead *);
255 static void free_addrselectpolicy(struct policyhead *);
256 static struct policyqueue *match_addrselectpolicy(struct sockaddr *,
257 struct policyhead *);
258 static int matchlen(struct sockaddr *, struct sockaddr *);
259
260 static struct addrinfo *getanswer(const querybuf *, int, const char *, int,
261 const struct addrinfo *, res_state);
262 #if defined(RESOLVSORT)
263 static int addr4sort(struct addrinfo *, res_state);
264 #endif
265 static int _dns_getaddrinfo(void *, void *, va_list);
266 static void _sethtent(FILE **);
267 static void _endhtent(FILE **);
268 static struct addrinfo *_gethtent(FILE **, const char *,
269 const struct addrinfo *);
270 static int _files_getaddrinfo(void *, void *, va_list);
271 #ifdef YP
272 static struct addrinfo *_yphostent(char *, const struct addrinfo *);
273 static int _yp_getaddrinfo(void *, void *, va_list);
274 #endif
275 #ifdef NS_CACHING
276 static int addrinfo_id_func(char *, size_t *, va_list, void *);
277 static int addrinfo_marshal_func(char *, size_t *, void *, va_list,
278 void *);
279 static int addrinfo_unmarshal_func(char *, size_t, void *, va_list,
280 void *);
281 #endif
282
283 static int res_queryN(const char *, struct res_target *, res_state);
284 static int res_searchN(const char *, struct res_target *, res_state);
285 static int res_querydomainN(const char *, const char *,
286 struct res_target *, res_state);
287
288 /* XXX macros that make external reference is BAD. */
289
290 #define GET_AI(ai, afd, addr) \
291 do { \
292 /* external reference: pai, error, and label free */ \
293 (ai) = get_ai(pai, (afd), (addr)); \
294 if ((ai) == NULL) { \
295 error = EAI_MEMORY; \
296 goto free; \
297 } \
298 } while (/*CONSTCOND*/0)
299
300 #define GET_PORT(ai, serv) \
301 do { \
302 /* external reference: error and label free */ \
303 error = get_port((ai), (serv), 0); \
304 if (error != 0) \
305 goto free; \
306 } while (/*CONSTCOND*/0)
307
308 #define GET_CANONNAME(ai, str) \
309 do { \
310 /* external reference: pai, error and label free */ \
311 error = get_canonname(pai, (ai), (str)); \
312 if (error != 0) \
313 goto free; \
314 } while (/*CONSTCOND*/0)
315
316 #define ERR(err) \
317 do { \
318 /* external reference: error, and label bad */ \
319 error = (err); \
320 goto bad; \
321 /*NOTREACHED*/ \
322 } while (/*CONSTCOND*/0)
323
324 #define MATCH_FAMILY(x, y, w) \
325 ((x) == (y) || (/*CONSTCOND*/(w) && ((x) == PF_UNSPEC || (y) == PF_UNSPEC)))
326 #define MATCH(x, y, w) \
327 ((x) == (y) || (/*CONSTCOND*/(w) && ((x) == ANY || (y) == ANY)))
328
329 void
330 freeaddrinfo(struct addrinfo *ai)
331 {
332 struct addrinfo *next;
333
334 do {
335 next = ai->ai_next;
336 if (ai->ai_canonname)
337 free(ai->ai_canonname);
338 /* no need to free(ai->ai_addr) */
339 free(ai);
340 ai = next;
341 } while (ai);
342 }
343
344 static int
345 str2number(const char *p, int *portp)
346 {
347 char *ep;
348 unsigned long v;
349
350 if (*p == '\0')
351 return -1;
352 ep = NULL;
353 errno = 0;
354 v = strtoul(p, &ep, 10);
355 if (errno == 0 && ep && *ep == '\0' && v <= UINT_MAX) {
356 *portp = v;
357 return 0;
358 } else
359 return -1;
360 }
361
362 int
363 getaddrinfo(const char *hostname, const char *servname,
364 const struct addrinfo *hints, struct addrinfo **res)
365 {
366 struct addrinfo sentinel;
367 struct addrinfo *cur;
368 int error = 0;
369 struct addrinfo ai;
370 struct addrinfo ai0;
371 struct addrinfo *pai;
372 const struct explore *ex;
373 int numeric = 0;
374
375 memset(&sentinel, 0, sizeof(sentinel));
376 cur = &sentinel;
377 pai = &ai;
378 pai->ai_flags = 0;
379 pai->ai_family = PF_UNSPEC;
380 pai->ai_socktype = ANY;
381 pai->ai_protocol = ANY;
382 pai->ai_addrlen = 0;
383 pai->ai_canonname = NULL;
384 pai->ai_addr = NULL;
385 pai->ai_next = NULL;
386
387 if (hostname == NULL && servname == NULL)
388 return EAI_NONAME;
389 if (hints) {
390 /* error check for hints */
391 if (hints->ai_addrlen || hints->ai_canonname ||
392 hints->ai_addr || hints->ai_next)
393 ERR(EAI_BADHINTS); /* xxx */
394 if (hints->ai_flags & ~AI_MASK)
395 ERR(EAI_BADFLAGS);
396 switch (hints->ai_family) {
397 case PF_UNSPEC:
398 case PF_INET:
399 #ifdef INET6
400 case PF_INET6:
401 #endif
402 break;
403 default:
404 ERR(EAI_FAMILY);
405 }
406 memcpy(pai, hints, sizeof(*pai));
407
408 /*
409 * if both socktype/protocol are specified, check if they
410 * are meaningful combination.
411 */
412 if (pai->ai_socktype != ANY && pai->ai_protocol != ANY) {
413 for (ex = explore; ex->e_af >= 0; ex++) {
414 if (pai->ai_family != ex->e_af)
415 continue;
416 if (ex->e_socktype == ANY)
417 continue;
418 if (ex->e_protocol == ANY)
419 continue;
420 if (pai->ai_socktype == ex->e_socktype &&
421 pai->ai_protocol != ex->e_protocol) {
422 ERR(EAI_BADHINTS);
423 }
424 }
425 }
426 }
427
428 /*
429 * check for special cases. (1) numeric servname is disallowed if
430 * socktype/protocol are left unspecified. (2) servname is disallowed
431 * for raw and other inet{,6} sockets.
432 */
433 if (MATCH_FAMILY(pai->ai_family, PF_INET, 1)
434 #ifdef PF_INET6
435 || MATCH_FAMILY(pai->ai_family, PF_INET6, 1)
436 #endif
437 ) {
438 ai0 = *pai; /* backup *pai */
439
440 if (pai->ai_family == PF_UNSPEC) {
441 #ifdef PF_INET6
442 pai->ai_family = PF_INET6;
443 #else
444 pai->ai_family = PF_INET;
445 #endif
446 }
447 error = get_portmatch(pai, servname);
448 if (error)
449 ERR(error);
450
451 *pai = ai0;
452 }
453
454 ai0 = *pai;
455
456 /* NULL hostname, or numeric hostname */
457 for (ex = explore; ex->e_af >= 0; ex++) {
458 *pai = ai0;
459
460 /* PF_UNSPEC entries are prepared for DNS queries only */
461 if (ex->e_af == PF_UNSPEC)
462 continue;
463
464 if (!MATCH_FAMILY(pai->ai_family, ex->e_af, WILD_AF(ex)))
465 continue;
466 if (!MATCH(pai->ai_socktype, ex->e_socktype, WILD_SOCKTYPE(ex)))
467 continue;
468 if (!MATCH(pai->ai_protocol, ex->e_protocol, WILD_PROTOCOL(ex)))
469 continue;
470
471 if (pai->ai_family == PF_UNSPEC)
472 pai->ai_family = ex->e_af;
473 if (pai->ai_socktype == ANY && ex->e_socktype != ANY)
474 pai->ai_socktype = ex->e_socktype;
475 if (pai->ai_protocol == ANY && ex->e_protocol != ANY)
476 pai->ai_protocol = ex->e_protocol;
477
478 if (hostname == NULL)
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 numeric = 1;
498 goto good;
499 }
500
501 if (hostname == NULL)
502 ERR(EAI_NONAME); /* used to be EAI_NODATA */
503 if (pai->ai_flags & AI_NUMERICHOST)
504 ERR(EAI_NONAME);
505
506 if ((pai->ai_flags & AI_ADDRCONFIG) != 0 && !addrconfig(&ai0))
507 ERR(EAI_FAIL);
508
509 /*
510 * hostname as alphabetical name.
511 * we would like to prefer AF_INET6 than AF_INET, so we'll make a
512 * outer loop by AFs.
513 */
514 for (ex = explore; ex->e_af >= 0; ex++) {
515 *pai = ai0;
516
517 /* require exact match for family field */
518 if (pai->ai_family != ex->e_af)
519 continue;
520
521 if (!MATCH(pai->ai_socktype, ex->e_socktype,
522 WILD_SOCKTYPE(ex))) {
523 continue;
524 }
525 if (!MATCH(pai->ai_protocol, ex->e_protocol,
526 WILD_PROTOCOL(ex))) {
527 continue;
528 }
529
530 if (pai->ai_socktype == ANY && ex->e_socktype != ANY)
531 pai->ai_socktype = ex->e_socktype;
532 if (pai->ai_protocol == ANY && ex->e_protocol != ANY)
533 pai->ai_protocol = ex->e_protocol;
534
535 error = explore_fqdn(pai, hostname, servname, &cur->ai_next);
536
537 while (cur && cur->ai_next)
538 cur = cur->ai_next;
539 }
540
541 /* XXX inhibit errors if we have the result */
542 if (sentinel.ai_next)
543 error = 0;
544
545 good:
546 /*
547 * ensure we return either:
548 * - error == 0, non-NULL *res
549 * - error != 0, NULL *res
550 */
551 if (error == 0) {
552 if (sentinel.ai_next) {
553 /*
554 * If the returned entry is for an active connection,
555 * and the given name is not numeric, reorder the
556 * list, so that the application would try the list
557 * in the most efficient order. Since the head entry
558 * of the original list may contain ai_canonname and
559 * that entry may be moved elsewhere in the new list,
560 * we keep the pointer and will restore it in the new
561 * head entry. (Note that RFC3493 requires the head
562 * entry store it when requested by the caller).
563 */
564 if (hints == NULL || !(hints->ai_flags & AI_PASSIVE)) {
565 if (!numeric) {
566 char *canonname;
567
568 canonname =
569 sentinel.ai_next->ai_canonname;
570 sentinel.ai_next->ai_canonname = NULL;
571 reorder(&sentinel);
572 if (sentinel.ai_next->ai_canonname ==
573 NULL) {
574 sentinel.ai_next->ai_canonname
575 = canonname;
576 } else if (canonname != NULL)
577 free(canonname);
578 }
579 }
580 *res = sentinel.ai_next;
581 return SUCCESS;
582 } else
583 error = EAI_FAIL;
584 }
585 free:
586 bad:
587 if (sentinel.ai_next)
588 freeaddrinfo(sentinel.ai_next);
589 *res = NULL;
590 return error;
591 }
592
593 static int
594 reorder(struct addrinfo *sentinel)
595 {
596 struct addrinfo *ai, **aip;
597 struct ai_order *aio;
598 int i, n;
599 struct policyhead policyhead;
600
601 /* count the number of addrinfo elements for sorting. */
602 for (n = 0, ai = sentinel->ai_next; ai != NULL; ai = ai->ai_next, n++)
603 ;
604
605 /*
606 * If the number is small enough, we can skip the reordering process.
607 */
608 if (n <= 1)
609 return(n);
610
611 /* allocate a temporary array for sort and initialization of it. */
612 if ((aio = malloc(sizeof(*aio) * n)) == NULL)
613 return(n); /* give up reordering */
614 memset(aio, 0, sizeof(*aio) * n);
615
616 /* retrieve address selection policy from the kernel */
617 TAILQ_INIT(&policyhead);
618 if (!get_addrselectpolicy(&policyhead)) {
619 /* no policy is installed into kernel, we don't sort. */
620 free(aio);
621 return (n);
622 }
623
624 for (i = 0, ai = sentinel->ai_next; i < n; ai = ai->ai_next, i++) {
625 aio[i].aio_ai = ai;
626 aio[i].aio_dstscope = gai_addr2scopetype(ai->ai_addr);
627 aio[i].aio_dstpolicy = match_addrselectpolicy(ai->ai_addr,
628 &policyhead);
629 set_source(&aio[i], &policyhead);
630 }
631
632 /* perform sorting. */
633 qsort(aio, n, sizeof(*aio), comp_dst);
634
635 /* reorder the addrinfo chain. */
636 for (i = 0, aip = &sentinel->ai_next; i < n; i++) {
637 *aip = aio[i].aio_ai;
638 aip = &aio[i].aio_ai->ai_next;
639 }
640 *aip = NULL;
641
642 /* cleanup and return */
643 free(aio);
644 free_addrselectpolicy(&policyhead);
645 return(n);
646 }
647
648 static int
649 get_addrselectpolicy(struct policyhead *head)
650 {
651 #ifdef INET6
652 int mib[] = { CTL_NET, PF_INET6, IPPROTO_IPV6, IPV6CTL_ADDRCTLPOLICY };
653 size_t l;
654 char *buf;
655 struct in6_addrpolicy *pol, *ep;
656
657 if (sysctl(mib, sizeof(mib) / sizeof(mib[0]), NULL, &l, NULL, 0) < 0)
658 return (0);
659 if ((buf = malloc(l)) == NULL)
660 return (0);
661 if (sysctl(mib, sizeof(mib) / sizeof(mib[0]), buf, &l, NULL, 0) < 0) {
662 free(buf);
663 return (0);
664 }
665
666 ep = (struct in6_addrpolicy *)(buf + l);
667 for (pol = (struct in6_addrpolicy *)buf; pol + 1 <= ep; pol++) {
668 struct policyqueue *new;
669
670 if ((new = malloc(sizeof(*new))) == NULL) {
671 free_addrselectpolicy(head); /* make the list empty */
672 break;
673 }
674 new->pc_policy = *pol;
675 TAILQ_INSERT_TAIL(head, new, pc_entry);
676 }
677
678 free(buf);
679 return (1);
680 #else
681 return (0);
682 #endif
683 }
684
685 static void
686 free_addrselectpolicy(struct policyhead *head)
687 {
688 struct policyqueue *ent, *nent;
689
690 for (ent = TAILQ_FIRST(head); ent; ent = nent) {
691 nent = TAILQ_NEXT(ent, pc_entry);
692 TAILQ_REMOVE(head, ent, pc_entry);
693 free(ent);
694 }
695 }
696
697 static struct policyqueue *
698 match_addrselectpolicy(struct sockaddr *addr, struct policyhead *head)
699 {
700 #ifdef INET6
701 struct policyqueue *ent, *bestent = NULL;
702 struct in6_addrpolicy *pol;
703 int matchlen, bestmatchlen = -1;
704 u_char *mp, *ep, *k, *p, m;
705 struct sockaddr_in6 key;
706
707 switch(addr->sa_family) {
708 case AF_INET6:
709 key = *(struct sockaddr_in6 *)addr;
710 break;
711 case AF_INET:
712 /* convert the address into IPv4-mapped IPv6 address. */
713 memset(&key, 0, sizeof(key));
714 key.sin6_family = AF_INET6;
715 key.sin6_len = sizeof(key);
716 key.sin6_addr.s6_addr[10] = 0xff;
717 key.sin6_addr.s6_addr[11] = 0xff;
718 memcpy(&key.sin6_addr.s6_addr[12],
719 &((struct sockaddr_in *)addr)->sin_addr, 4);
720 break;
721 default:
722 return(NULL);
723 }
724
725 for (ent = TAILQ_FIRST(head); ent; ent = TAILQ_NEXT(ent, pc_entry)) {
726 pol = &ent->pc_policy;
727 matchlen = 0;
728
729 mp = (u_char *)&pol->addrmask.sin6_addr;
730 ep = mp + 16; /* XXX: scope field? */
731 k = (u_char *)&key.sin6_addr;
732 p = (u_char *)&pol->addr.sin6_addr;
733 for (; mp < ep && *mp; mp++, k++, p++) {
734 m = *mp;
735 if ((*k & m) != *p)
736 goto next; /* not match */
737 if (m == 0xff) /* short cut for a typical case */
738 matchlen += 8;
739 else {
740 while (m >= 0x80) {
741 matchlen++;
742 m <<= 1;
743 }
744 }
745 }
746
747 /* matched. check if this is better than the current best. */
748 if (matchlen > bestmatchlen) {
749 bestent = ent;
750 bestmatchlen = matchlen;
751 }
752
753 next:
754 continue;
755 }
756
757 return(bestent);
758 #else
759 return(NULL);
760 #endif
761
762 }
763
764 static void
765 set_source(struct ai_order *aio, struct policyhead *ph)
766 {
767 struct addrinfo ai = *aio->aio_ai;
768 struct sockaddr_storage ss;
769 socklen_t srclen;
770 int s;
771
772 /* set unspec ("no source is available"), just in case */
773 aio->aio_srcsa.sa_family = AF_UNSPEC;
774 aio->aio_srcscope = -1;
775
776 switch(ai.ai_family) {
777 case AF_INET:
778 #ifdef INET6
779 case AF_INET6:
780 #endif
781 break;
782 default: /* ignore unsupported AFs explicitly */
783 return;
784 }
785
786 /* XXX: make a dummy addrinfo to call connect() */
787 ai.ai_socktype = SOCK_DGRAM;
788 ai.ai_protocol = IPPROTO_UDP; /* is UDP too specific? */
789 ai.ai_next = NULL;
790 memset(&ss, 0, sizeof(ss));
791 memcpy(&ss, ai.ai_addr, ai.ai_addrlen);
792 ai.ai_addr = (struct sockaddr *)&ss;
793 get_port(&ai, "1", 0);
794
795 /* open a socket to get the source address for the given dst */
796 if ((s = _socket(ai.ai_family, ai.ai_socktype, ai.ai_protocol)) < 0)
797 return; /* give up */
798 if (_connect(s, ai.ai_addr, ai.ai_addrlen) < 0)
799 goto cleanup;
800 srclen = ai.ai_addrlen;
801 if (_getsockname(s, &aio->aio_srcsa, &srclen) < 0) {
802 aio->aio_srcsa.sa_family = AF_UNSPEC;
803 goto cleanup;
804 }
805 aio->aio_srcscope = gai_addr2scopetype(&aio->aio_srcsa);
806 aio->aio_srcpolicy = match_addrselectpolicy(&aio->aio_srcsa, ph);
807 aio->aio_matchlen = matchlen(&aio->aio_srcsa, aio->aio_ai->ai_addr);
808 #ifdef INET6
809 if (ai.ai_family == AF_INET6) {
810 struct in6_ifreq ifr6;
811 u_int32_t flags6;
812
813 /* XXX: interface name should not be hardcoded */
814 strncpy(ifr6.ifr_name, "lo0", sizeof(ifr6.ifr_name));
815 memset(&ifr6, 0, sizeof(ifr6));
816 memcpy(&ifr6.ifr_addr, ai.ai_addr, ai.ai_addrlen);
817 if (_ioctl(s, SIOCGIFAFLAG_IN6, &ifr6) == 0) {
818 flags6 = ifr6.ifr_ifru.ifru_flags6;
819 if ((flags6 & IN6_IFF_DEPRECATED))
820 aio->aio_srcflag |= AIO_SRCFLAG_DEPRECATED;
821 }
822 }
823 #endif
824
825 cleanup:
826 _close(s);
827 return;
828 }
829
830 static int
831 matchlen(struct sockaddr *src, struct sockaddr *dst)
832 {
833 int match = 0;
834 u_char *s, *d;
835 u_char *lim, r;
836 int addrlen;
837
838 switch (src->sa_family) {
839 #ifdef INET6
840 case AF_INET6:
841 s = (u_char *)&((struct sockaddr_in6 *)src)->sin6_addr;
842 d = (u_char *)&((struct sockaddr_in6 *)dst)->sin6_addr;
843 addrlen = sizeof(struct in6_addr);
844 lim = s + addrlen;
845 break;
846 #endif
847 case AF_INET:
848 s = (u_char *)&((struct sockaddr_in *)src)->sin_addr;
849 d = (u_char *)&((struct sockaddr_in *)dst)->sin_addr;
850 addrlen = sizeof(struct in_addr);
851 lim = s + addrlen;
852 break;
853 default:
854 return(0);
855 }
856
857 while (s < lim)
858 if ((r = (*d++ ^ *s++)) != 0) {
859 while (r < addrlen * 8) {
860 match++;
861 r <<= 1;
862 }
863 break;
864 } else
865 match += 8;
866 return(match);
867 }
868
869 static int
870 comp_dst(const void *arg1, const void *arg2)
871 {
872 const struct ai_order *dst1 = arg1, *dst2 = arg2;
873
874 /*
875 * Rule 1: Avoid unusable destinations.
876 * XXX: we currently do not consider if an appropriate route exists.
877 */
878 if (dst1->aio_srcsa.sa_family != AF_UNSPEC &&
879 dst2->aio_srcsa.sa_family == AF_UNSPEC) {
880 return(-1);
881 }
882 if (dst1->aio_srcsa.sa_family == AF_UNSPEC &&
883 dst2->aio_srcsa.sa_family != AF_UNSPEC) {
884 return(1);
885 }
886
887 /* Rule 2: Prefer matching scope. */
888 if (dst1->aio_dstscope == dst1->aio_srcscope &&
889 dst2->aio_dstscope != dst2->aio_srcscope) {
890 return(-1);
891 }
892 if (dst1->aio_dstscope != dst1->aio_srcscope &&
893 dst2->aio_dstscope == dst2->aio_srcscope) {
894 return(1);
895 }
896
897 /* Rule 3: Avoid deprecated addresses. */
898 if (dst1->aio_srcsa.sa_family != AF_UNSPEC &&
899 dst2->aio_srcsa.sa_family != AF_UNSPEC) {
900 if (!(dst1->aio_srcflag & AIO_SRCFLAG_DEPRECATED) &&
901 (dst2->aio_srcflag & AIO_SRCFLAG_DEPRECATED)) {
902 return(-1);
903 }
904 if ((dst1->aio_srcflag & AIO_SRCFLAG_DEPRECATED) &&
905 !(dst2->aio_srcflag & AIO_SRCFLAG_DEPRECATED)) {
906 return(1);
907 }
908 }
909
910 /* Rule 4: Prefer home addresses. */
911 /* XXX: not implemented yet */
912
913 /* Rule 5: Prefer matching label. */
914 #ifdef INET6
915 if (dst1->aio_srcpolicy && dst1->aio_dstpolicy &&
916 dst1->aio_srcpolicy->pc_policy.label ==
917 dst1->aio_dstpolicy->pc_policy.label &&
918 (dst2->aio_srcpolicy == NULL || dst2->aio_dstpolicy == NULL ||
919 dst2->aio_srcpolicy->pc_policy.label !=
920 dst2->aio_dstpolicy->pc_policy.label)) {
921 return(-1);
922 }
923 if (dst2->aio_srcpolicy && dst2->aio_dstpolicy &&
924 dst2->aio_srcpolicy->pc_policy.label ==
925 dst2->aio_dstpolicy->pc_policy.label &&
926 (dst1->aio_srcpolicy == NULL || dst1->aio_dstpolicy == NULL ||
927 dst1->aio_srcpolicy->pc_policy.label !=
928 dst1->aio_dstpolicy->pc_policy.label)) {
929 return(1);
930 }
931 #endif
932
933 /* Rule 6: Prefer higher precedence. */
934 #ifdef INET6
935 if (dst1->aio_dstpolicy &&
936 (dst2->aio_dstpolicy == NULL ||
937 dst1->aio_dstpolicy->pc_policy.preced >
938 dst2->aio_dstpolicy->pc_policy.preced)) {
939 return(-1);
940 }
941 if (dst2->aio_dstpolicy &&
942 (dst1->aio_dstpolicy == NULL ||
943 dst2->aio_dstpolicy->pc_policy.preced >
944 dst1->aio_dstpolicy->pc_policy.preced)) {
945 return(1);
946 }
947 #endif
948
949 /* Rule 7: Prefer native transport. */
950 /* XXX: not implemented yet */
951
952 /* Rule 8: Prefer smaller scope. */
953 if (dst1->aio_dstscope >= 0 &&
954 dst1->aio_dstscope < dst2->aio_dstscope) {
955 return(-1);
956 }
957 if (dst2->aio_dstscope >= 0 &&
958 dst2->aio_dstscope < dst1->aio_dstscope) {
959 return(1);
960 }
961
962 /*
963 * Rule 9: Use longest matching prefix.
964 * We compare the match length in a same AF only.
965 */
966 if (dst1->aio_ai->ai_addr->sa_family ==
967 dst2->aio_ai->ai_addr->sa_family) {
968 if (dst1->aio_matchlen > dst2->aio_matchlen) {
969 return(-1);
970 }
971 if (dst1->aio_matchlen < dst2->aio_matchlen) {
972 return(1);
973 }
974 }
975
976 /* Rule 10: Otherwise, leave the order unchanged. */
977 return(-1);
978 }
979
980 /*
981 * Copy from scope.c.
982 * XXX: we should standardize the functions and link them as standard
983 * library.
984 */
985 static int
986 gai_addr2scopetype(struct sockaddr *sa)
987 {
988 #ifdef INET6
989 struct sockaddr_in6 *sa6;
990 #endif
991 struct sockaddr_in *sa4;
992
993 switch(sa->sa_family) {
994 #ifdef INET6
995 case AF_INET6:
996 sa6 = (struct sockaddr_in6 *)sa;
997 if (IN6_IS_ADDR_MULTICAST(&sa6->sin6_addr)) {
998 /* just use the scope field of the multicast address */
999 return(sa6->sin6_addr.s6_addr[2] & 0x0f);
1000 }
1001 /*
1002 * Unicast addresses: map scope type to corresponding scope
1003 * value defined for multcast addresses.
1004 * XXX: hardcoded scope type values are bad...
1005 */
1006 if (IN6_IS_ADDR_LOOPBACK(&sa6->sin6_addr))
1007 return(1); /* node local scope */
1008 if (IN6_IS_ADDR_LINKLOCAL(&sa6->sin6_addr))
1009 return(2); /* link-local scope */
1010 if (IN6_IS_ADDR_SITELOCAL(&sa6->sin6_addr))
1011 return(5); /* site-local scope */
1012 return(14); /* global scope */
1013 break;
1014 #endif
1015 case AF_INET:
1016 /*
1017 * IPv4 pseudo scoping according to RFC 3484.
1018 */
1019 sa4 = (struct sockaddr_in *)sa;
1020 /* IPv4 autoconfiguration addresses have link-local scope. */
1021 if (((u_char *)&sa4->sin_addr)[0] == 169 &&
1022 ((u_char *)&sa4->sin_addr)[1] == 254)
1023 return(2);
1024 /* Private addresses have site-local scope. */
1025 if (((u_char *)&sa4->sin_addr)[0] == 10 ||
1026 (((u_char *)&sa4->sin_addr)[0] == 172 &&
1027 (((u_char *)&sa4->sin_addr)[1] & 0xf0) == 16) ||
1028 (((u_char *)&sa4->sin_addr)[0] == 192 &&
1029 ((u_char *)&sa4->sin_addr)[1] == 168))
1030 return(14); /* XXX: It should be 5 unless NAT */
1031 /* Loopback addresses have link-local scope. */
1032 if (((u_char *)&sa4->sin_addr)[0] == 127)
1033 return(2);
1034 return(14);
1035 break;
1036 default:
1037 errno = EAFNOSUPPORT; /* is this a good error? */
1038 return(-1);
1039 }
1040 }
1041
1042 /*
1043 * hostname == NULL.
1044 * passive socket -> anyaddr (0.0.0.0 or ::)
1045 * non-passive socket -> localhost (127.0.0.1 or ::1)
1046 */
1047 static int
1048 explore_null(const struct addrinfo *pai, const char *servname,
1049 struct addrinfo **res)
1050 {
1051 int s;
1052 const struct afd *afd;
1053 struct addrinfo *ai;
1054 int error;
1055
1056 *res = NULL;
1057 ai = NULL;
1058
1059 /*
1060 * filter out AFs that are not supported by the kernel
1061 * XXX errno?
1062 */
1063 s = _socket(pai->ai_family, SOCK_DGRAM, 0);
1064 if (s < 0) {
1065 if (errno != EMFILE)
1066 return 0;
1067 } else
1068 _close(s);
1069
1070 /*
1071 * if the servname does not match socktype/protocol, ignore it.
1072 */
1073 if (get_portmatch(pai, servname) != 0)
1074 return 0;
1075
1076 afd = find_afd(pai->ai_family);
1077 if (afd == NULL)
1078 return 0;
1079
1080 if (pai->ai_flags & AI_PASSIVE) {
1081 GET_AI(ai, afd, afd->a_addrany);
1082 GET_PORT(ai, servname);
1083 } else {
1084 GET_AI(ai, afd, afd->a_loopback);
1085 GET_PORT(ai, servname);
1086 }
1087
1088 *res = ai;
1089 return 0;
1090
1091 free:
1092 if (ai != NULL)
1093 freeaddrinfo(ai);
1094 return error;
1095 }
1096
1097 /*
1098 * numeric hostname
1099 */
1100 static int
1101 explore_numeric(const struct addrinfo *pai, const char *hostname,
1102 const char *servname, struct addrinfo **res,
1103 const char *canonname)
1104 {
1105 const struct afd *afd;
1106 struct addrinfo *ai;
1107 int error;
1108 char pton[PTON_MAX];
1109
1110 *res = NULL;
1111 ai = NULL;
1112
1113 /*
1114 * if the servname does not match socktype/protocol, ignore it.
1115 */
1116 if (get_portmatch(pai, servname) != 0)
1117 return 0;
1118
1119 afd = find_afd(pai->ai_family);
1120 if (afd == NULL)
1121 return 0;
1122
1123 switch (afd->a_af) {
1124 case AF_INET:
1125 /*
1126 * RFC3493 requires getaddrinfo() to accept AF_INET formats
1127 * that are accepted by inet_addr() and its family. The
1128 * accepted forms includes the "classful" one, which inet_pton
1129 * does not accept. So we need to separate the case for
1130 * AF_INET.
1131 */
1132 if (inet_aton(hostname, (struct in_addr *)pton) != 1)
1133 return 0;
1134 break;
1135 default:
1136 if (inet_pton(afd->a_af, hostname, pton) != 1)
1137 return 0;
1138 break;
1139 }
1140
1141 if (pai->ai_family == afd->a_af) {
1142 GET_AI(ai, afd, pton);
1143 GET_PORT(ai, servname);
1144 if ((pai->ai_flags & AI_CANONNAME)) {
1145 /*
1146 * Set the numeric address itself as the canonical
1147 * name, based on a clarification in RFC3493.
1148 */
1149 GET_CANONNAME(ai, canonname);
1150 }
1151 } else {
1152 /*
1153 * XXX: This should not happen since we already matched the AF
1154 * by find_afd.
1155 */
1156 ERR(EAI_FAMILY);
1157 }
1158
1159 *res = ai;
1160 return 0;
1161
1162 free:
1163 bad:
1164 if (ai != NULL)
1165 freeaddrinfo(ai);
1166 return error;
1167 }
1168
1169 /*
1170 * numeric hostname with scope
1171 */
1172 static int
1173 explore_numeric_scope(const struct addrinfo *pai, const char *hostname,
1174 const char *servname, struct addrinfo **res)
1175 {
1176 #if !defined(SCOPE_DELIMITER) || !defined(INET6)
1177 return explore_numeric(pai, hostname, servname, res, hostname);
1178 #else
1179 const struct afd *afd;
1180 struct addrinfo *cur;
1181 int error;
1182 char *cp, *hostname2 = NULL, *scope, *addr;
1183 struct sockaddr_in6 *sin6;
1184
1185 /*
1186 * if the servname does not match socktype/protocol, ignore it.
1187 */
1188 if (get_portmatch(pai, servname) != 0)
1189 return 0;
1190
1191 afd = find_afd(pai->ai_family);
1192 if (afd == NULL)
1193 return 0;
1194
1195 if (!afd->a_scoped)
1196 return explore_numeric(pai, hostname, servname, res, hostname);
1197
1198 cp = strchr(hostname, SCOPE_DELIMITER);
1199 if (cp == NULL)
1200 return explore_numeric(pai, hostname, servname, res, hostname);
1201
1202 /*
1203 * Handle special case of <scoped_address><delimiter><scope id>
1204 */
1205 hostname2 = strdup(hostname);
1206 if (hostname2 == NULL)
1207 return EAI_MEMORY;
1208 /* terminate at the delimiter */
1209 hostname2[cp - hostname] = '\0';
1210 addr = hostname2;
1211 scope = cp + 1;
1212
1213 error = explore_numeric(pai, addr, servname, res, hostname);
1214 if (error == 0) {
1215 u_int32_t scopeid;
1216
1217 for (cur = *res; cur; cur = cur->ai_next) {
1218 if (cur->ai_family != AF_INET6)
1219 continue;
1220 sin6 = (struct sockaddr_in6 *)(void *)cur->ai_addr;
1221 if (ip6_str2scopeid(scope, sin6, &scopeid) == -1) {
1222 free(hostname2);
1223 return(EAI_NONAME); /* XXX: is return OK? */
1224 }
1225 sin6->sin6_scope_id = scopeid;
1226 }
1227 }
1228
1229 free(hostname2);
1230
1231 return error;
1232 #endif
1233 }
1234
1235 static int
1236 get_canonname(const struct addrinfo *pai, struct addrinfo *ai, const char *str)
1237 {
1238 if ((pai->ai_flags & AI_CANONNAME) != 0) {
1239 ai->ai_canonname = strdup(str);
1240 if (ai->ai_canonname == NULL)
1241 return EAI_MEMORY;
1242 }
1243 return 0;
1244 }
1245
1246 static struct addrinfo *
1247 get_ai(const struct addrinfo *pai, const struct afd *afd, const char *addr)
1248 {
1249 char *p;
1250 struct addrinfo *ai;
1251 #ifdef FAITH
1252 struct in6_addr faith_prefix;
1253 char *fp_str;
1254 int translate = 0;
1255 #endif
1256
1257 #ifdef FAITH
1258 /*
1259 * Transfrom an IPv4 addr into a special IPv6 addr format for
1260 * IPv6->IPv4 translation gateway. (only TCP is supported now)
1261 *
1262 * +-----------------------------------+------------+
1263 * | faith prefix part (12 bytes) | embedded |
1264 * | | IPv4 addr part (4 bytes)
1265 * +-----------------------------------+------------+
1266 *
1267 * faith prefix part is specified as ascii IPv6 addr format
1268 * in environmental variable GAI.
1269 * For FAITH to work correctly, routing to faith prefix must be
1270 * setup toward a machine where a FAITH daemon operates.
1271 * Also, the machine must enable some mechanizm
1272 * (e.g. faith interface hack) to divert those packet with
1273 * faith prefixed destination addr to user-land FAITH daemon.
1274 */
1275 fp_str = getenv("GAI");
1276 if (fp_str && inet_pton(AF_INET6, fp_str, &faith_prefix) == 1 &&
1277 afd->a_af == AF_INET && pai->ai_socktype == SOCK_STREAM) {
1278 u_int32_t v4a;
1279 u_int8_t v4a_top;
1280
1281 memcpy(&v4a, addr, sizeof v4a);
1282 v4a_top = v4a >> IN_CLASSA_NSHIFT;
1283 if (!IN_MULTICAST(v4a) && !IN_EXPERIMENTAL(v4a) &&
1284 v4a_top != 0 && v4a != IN_LOOPBACKNET) {
1285 afd = &afdl[N_INET6];
1286 memcpy(&faith_prefix.s6_addr[12], addr,
1287 sizeof(struct in_addr));
1288 translate = 1;
1289 }
1290 }
1291 #endif
1292
1293 ai = (struct addrinfo *)malloc(sizeof(struct addrinfo)
1294 + (afd->a_socklen));
1295 if (ai == NULL)
1296 return NULL;
1297
1298 memcpy(ai, pai, sizeof(struct addrinfo));
1299 ai->ai_addr = (struct sockaddr *)(void *)(ai + 1);
1300 memset(ai->ai_addr, 0, (size_t)afd->a_socklen);
1301 ai->ai_addr->sa_len = afd->a_socklen;
1302 ai->ai_addrlen = afd->a_socklen;
1303 ai->ai_addr->sa_family = ai->ai_family = afd->a_af;
1304 p = (char *)(void *)(ai->ai_addr);
1305 #ifdef FAITH
1306 if (translate == 1)
1307 memcpy(p + afd->a_off, &faith_prefix, (size_t)afd->a_addrlen);
1308 else
1309 #endif
1310 memcpy(p + afd->a_off, addr, (size_t)afd->a_addrlen);
1311 return ai;
1312 }
1313
1314 static int
1315 get_portmatch(const struct addrinfo *ai, const char *servname)
1316 {
1317
1318 /* get_port does not touch first argument when matchonly == 1. */
1319 /* LINTED const cast */
1320 return get_port((struct addrinfo *)ai, servname, 1);
1321 }
1322
1323 static int
1324 get_port(struct addrinfo *ai, const char *servname, int matchonly)
1325 {
1326 const char *proto;
1327 struct servent *sp;
1328 int port, error;
1329 int allownumeric;
1330
1331 if (servname == NULL)
1332 return 0;
1333 switch (ai->ai_family) {
1334 case AF_INET:
1335 #ifdef AF_INET6
1336 case AF_INET6:
1337 #endif
1338 break;
1339 default:
1340 return 0;
1341 }
1342
1343 switch (ai->ai_socktype) {
1344 case SOCK_RAW:
1345 return EAI_SERVICE;
1346 case SOCK_DGRAM:
1347 case SOCK_STREAM:
1348 allownumeric = 1;
1349 break;
1350 case ANY:
1351 allownumeric = 0;
1352 break;
1353 default:
1354 return EAI_SOCKTYPE;
1355 }
1356
1357 error = str2number(servname, &port);
1358 if (error == 0) {
1359 if (!allownumeric)
1360 return EAI_SERVICE;
1361 if (port < 0 || port > 65535)
1362 return EAI_SERVICE;
1363 port = htons(port);
1364 } else {
1365 if (ai->ai_flags & AI_NUMERICSERV)
1366 return EAI_NONAME;
1367 switch (ai->ai_socktype) {
1368 case SOCK_DGRAM:
1369 proto = "udp";
1370 break;
1371 case SOCK_STREAM:
1372 proto = "tcp";
1373 break;
1374 default:
1375 proto = NULL;
1376 break;
1377 }
1378
1379 if ((sp = getservbyname(servname, proto)) == NULL)
1380 return EAI_SERVICE;
1381 port = sp->s_port;
1382 }
1383
1384 if (!matchonly) {
1385 switch (ai->ai_family) {
1386 case AF_INET:
1387 ((struct sockaddr_in *)(void *)
1388 ai->ai_addr)->sin_port = port;
1389 break;
1390 #ifdef INET6
1391 case AF_INET6:
1392 ((struct sockaddr_in6 *)(void *)
1393 ai->ai_addr)->sin6_port = port;
1394 break;
1395 #endif
1396 }
1397 }
1398
1399 return 0;
1400 }
1401
1402 static const struct afd *
1403 find_afd(int af)
1404 {
1405 const struct afd *afd;
1406
1407 if (af == PF_UNSPEC)
1408 return NULL;
1409 for (afd = afdl; afd->a_af; afd++) {
1410 if (afd->a_af == af)
1411 return afd;
1412 }
1413 return NULL;
1414 }
1415
1416 /*
1417 * post-2553: AI_ADDRCONFIG check. if we use getipnodeby* as backend, backend
1418 * will take care of it.
1419 * the semantics of AI_ADDRCONFIG is not defined well. we are not sure
1420 * if the code is right or not.
1421 *
1422 * XXX PF_UNSPEC -> PF_INET6 + PF_INET mapping needs to be in sync with
1423 * _dns_getaddrinfo.
1424 */
1425 static int
1426 addrconfig(struct addrinfo *pai)
1427 {
1428 int s, af;
1429
1430 /*
1431 * TODO:
1432 * Note that implementation dependent test for address
1433 * configuration should be done everytime called
1434 * (or apropriate interval),
1435 * because addresses will be dynamically assigned or deleted.
1436 */
1437 af = pai->ai_family;
1438 if (af == AF_UNSPEC) {
1439 if ((s = _socket(AF_INET6, SOCK_DGRAM, 0)) < 0)
1440 af = AF_INET;
1441 else {
1442 _close(s);
1443 if ((s = _socket(AF_INET, SOCK_DGRAM, 0)) < 0)
1444 af = AF_INET6;
1445 else
1446 _close(s);
1447 }
1448 }
1449 if (af != AF_UNSPEC) {
1450 if ((s = _socket(af, SOCK_DGRAM, 0)) < 0)
1451 return 0;
1452 _close(s);
1453 }
1454 pai->ai_family = af;
1455 return 1;
1456 }
1457
1458 #ifdef INET6
1459 /* convert a string to a scope identifier. XXX: IPv6 specific */
1460 static int
1461 ip6_str2scopeid(char *scope, struct sockaddr_in6 *sin6, u_int32_t *scopeid)
1462 {
1463 u_long lscopeid;
1464 struct in6_addr *a6;
1465 char *ep;
1466
1467 a6 = &sin6->sin6_addr;
1468
1469 /* empty scopeid portion is invalid */
1470 if (*scope == '\0')
1471 return -1;
1472
1473 if (IN6_IS_ADDR_LINKLOCAL(a6) || IN6_IS_ADDR_MC_LINKLOCAL(a6)) {
1474 /*
1475 * We currently assume a one-to-one mapping between links
1476 * and interfaces, so we simply use interface indices for
1477 * like-local scopes.
1478 */
1479 *scopeid = if_nametoindex(scope);
1480 if (*scopeid == 0)
1481 goto trynumeric;
1482 return 0;
1483 }
1484
1485 /* still unclear about literal, allow numeric only - placeholder */
1486 if (IN6_IS_ADDR_SITELOCAL(a6) || IN6_IS_ADDR_MC_SITELOCAL(a6))
1487 goto trynumeric;
1488 if (IN6_IS_ADDR_MC_ORGLOCAL(a6))
1489 goto trynumeric;
1490 else
1491 goto trynumeric; /* global */
1492
1493 /* try to convert to a numeric id as a last resort */
1494 trynumeric:
1495 errno = 0;
1496 lscopeid = strtoul(scope, &ep, 10);
1497 *scopeid = (u_int32_t)(lscopeid & 0xffffffffUL);
1498 if (errno == 0 && ep && *ep == '\0' && *scopeid == lscopeid)
1499 return 0;
1500 else
1501 return -1;
1502 }
1503 #endif
1504
1505
1506 #ifdef NS_CACHING
1507 static int
1508 addrinfo_id_func(char *buffer, size_t *buffer_size, va_list ap,
1509 void *cache_mdata)
1510 {
1511 res_state statp;
1512 u_long res_options;
1513
1514 const int op_id = 0; /* identifies the getaddrinfo for the cache */
1515 char *hostname;
1516 struct addrinfo *hints;
1517
1518 char *p;
1519 int ai_flags, ai_family, ai_socktype, ai_protocol;
1520 size_t desired_size, size;
1521
1522 statp = __res_state();
1523 res_options = statp->options & (RES_RECURSE | RES_DEFNAMES |
1524 RES_DNSRCH | RES_NOALIASES | RES_USE_INET6);
1525
1526 hostname = va_arg(ap, char *);
1527 hints = va_arg(ap, struct addrinfo *);
1528
1529 desired_size = sizeof(res_options) + sizeof(int) + sizeof(int) * 4;
1530 if (hostname != NULL) {
1531 size = strlen(hostname);
1532 desired_size += size + 1;
1533 } else
1534 size = 0;
1535
1536 if (desired_size > *buffer_size) {
1537 *buffer_size = desired_size;
1538 return (NS_RETURN);
1539 }
1540
1541 if (hints == NULL)
1542 ai_flags = ai_family = ai_socktype = ai_protocol = 0;
1543 else {
1544 ai_flags = hints->ai_flags;
1545 ai_family = hints->ai_family;
1546 ai_socktype = hints->ai_socktype;
1547 ai_protocol = hints->ai_protocol;
1548 }
1549
1550 p = buffer;
1551 memcpy(p, &res_options, sizeof(res_options));
1552 p += sizeof(res_options);
1553
1554 memcpy(p, &op_id, sizeof(int));
1555 p += sizeof(int);
1556
1557 memcpy(p, &ai_flags, sizeof(int));
1558 p += sizeof(int);
1559
1560 memcpy(p, &ai_family, sizeof(int));
1561 p += sizeof(int);
1562
1563 memcpy(p, &ai_socktype, sizeof(int));
1564 p += sizeof(int);
1565
1566 memcpy(p, &ai_protocol, sizeof(int));
1567 p += sizeof(int);
1568
1569 if (hostname != NULL)
1570 memcpy(p, hostname, size);
1571
1572 *buffer_size = desired_size;
1573 return (NS_SUCCESS);
1574 }
1575
1576 static int
1577 addrinfo_marshal_func(char *buffer, size_t *buffer_size, void *retval,
1578 va_list ap, void *cache_mdata)
1579 {
1580 struct addrinfo *ai, *cai;
1581 char *p;
1582 size_t desired_size, size, ai_size;
1583
1584 ai = *((struct addrinfo **)retval);
1585
1586 desired_size = sizeof(size_t);
1587 ai_size = 0;
1588 for (cai = ai; cai != NULL; cai = cai->ai_next) {
1589 desired_size += sizeof(struct addrinfo) + cai->ai_addrlen;
1590 if (cai->ai_canonname != NULL)
1591 desired_size += sizeof(size_t) +
1592 strlen(cai->ai_canonname);
1593 ++ai_size;
1594 }
1595
1596 if (desired_size > *buffer_size) {
1597 /* this assignment is here for future use */
1598 errno = ERANGE;
1599 *buffer_size = desired_size;
1600 return (NS_RETURN);
1601 }
1602
1603 memset(buffer, 0, desired_size);
1604 p = buffer;
1605
1606 memcpy(p, &ai_size, sizeof(size_t));
1607 p += sizeof(size_t);
1608 for (cai = ai; cai != NULL; cai = cai->ai_next) {
1609 memcpy(p, cai, sizeof(struct addrinfo));
1610 p += sizeof(struct addrinfo);
1611
1612 memcpy(p, cai->ai_addr, cai->ai_addrlen);
1613 p += cai->ai_addrlen;
1614
1615 if (cai->ai_canonname != NULL) {
1616 size = strlen(cai->ai_canonname);
1617 memcpy(p, &size, sizeof(size_t));
1618 p += sizeof(size_t);
1619
1620 memcpy(p, cai->ai_canonname, size);
1621 p += size;
1622 }
1623 }
1624
1625 return (NS_SUCCESS);
1626 }
1627
1628 static int
1629 addrinfo_unmarshal_func(char *buffer, size_t buffer_size, void *retval,
1630 va_list ap, void *cache_mdata)
1631 {
1632 struct addrinfo new_ai, *result, *sentinel, *lasts;
1633
1634 char *p;
1635 size_t ai_size, ai_i, size;
1636
1637 p = buffer;
1638 memcpy(&ai_size, p, sizeof(size_t));
1639 p += sizeof(size_t);
1640
1641 result = NULL;
1642 lasts = NULL;
1643 for (ai_i = 0; ai_i < ai_size; ++ai_i) {
1644 memcpy(&new_ai, p, sizeof(struct addrinfo));
1645 p += sizeof(struct addrinfo);
1646 size = new_ai.ai_addrlen + sizeof(struct addrinfo) +
1647 _ALIGNBYTES;
1648
1649 sentinel = (struct addrinfo *)malloc(size);
1650 memset(sentinel, 0, size);
1651
1652 memcpy(sentinel, &new_ai, sizeof(struct addrinfo));
1653 sentinel->ai_addr = (struct sockaddr *)_ALIGN((char *)sentinel +
1654 sizeof(struct addrinfo));
1655
1656 memcpy(sentinel->ai_addr, p, new_ai.ai_addrlen);
1657 p += new_ai.ai_addrlen;
1658
1659 if (new_ai.ai_canonname != NULL) {
1660 memcpy(&size, p, sizeof(size_t));
1661 p += sizeof(size_t);
1662
1663 sentinel->ai_canonname = (char *)malloc(size + 1);
1664 memset(sentinel->ai_canonname, 0, size + 1);
1665
1666 memcpy(sentinel->ai_canonname, p, size);
1667 p += size;
1668 }
1669
1670 if (result == NULL) {
1671 result = sentinel;
1672 lasts = sentinel;
1673 } else {
1674 lasts->ai_next = sentinel;
1675 lasts = sentinel;
1676 }
1677 }
1678
1679 *((struct addrinfo **)retval) = result;
1680 return (NS_SUCCESS);
1681 }
1682 #endif /* NS_CACHING */
1683
1684 /*
1685 * FQDN hostname, DNS lookup
1686 */
1687 static int
1688 explore_fqdn(const struct addrinfo *pai, const char *hostname,
1689 const char *servname, struct addrinfo **res)
1690 {
1691 struct addrinfo *result;
1692 struct addrinfo *cur;
1693 int error = 0;
1694
1695 #ifdef NS_CACHING
1696 static const nss_cache_info cache_info =
1697 NS_COMMON_CACHE_INFO_INITIALIZER(
1698 hosts, NULL, addrinfo_id_func, addrinfo_marshal_func,
1699 addrinfo_unmarshal_func);
1700 #endif
1701 static const ns_dtab dtab[] = {
1702 NS_FILES_CB(_files_getaddrinfo, NULL)
1703 { NSSRC_DNS, _dns_getaddrinfo, NULL }, /* force -DHESIOD */
1704 NS_NIS_CB(_yp_getaddrinfo, NULL)
1705 #ifdef NS_CACHING
1706 NS_CACHE_CB(&cache_info)
1707 #endif
1708 { 0 }
1709 };
1710
1711 result = NULL;
1712
1713 /*
1714 * if the servname does not match socktype/protocol, ignore it.
1715 */
1716 if (get_portmatch(pai, servname) != 0)
1717 return 0;
1718
1719 switch (_nsdispatch(&result, dtab, NSDB_HOSTS, "getaddrinfo",
1720 default_dns_files, hostname, pai)) {
1721 case NS_TRYAGAIN:
1722 error = EAI_AGAIN;
1723 goto free;
1724 case NS_UNAVAIL:
1725 error = EAI_FAIL;
1726 goto free;
1727 case NS_NOTFOUND:
1728 error = EAI_NONAME;
1729 goto free;
1730 case NS_SUCCESS:
1731 error = 0;
1732 for (cur = result; cur; cur = cur->ai_next) {
1733 GET_PORT(cur, servname);
1734 /* canonname should be filled already */
1735 }
1736 break;
1737 }
1738
1739 *res = result;
1740
1741 return 0;
1742
1743 free:
1744 if (result)
1745 freeaddrinfo(result);
1746 return error;
1747 }
1748
1749 #ifdef DEBUG
1750 static const char AskedForGot[] =
1751 "gethostby*.getanswer: asked for \"%s\", got \"%s\"";
1752 #endif
1753
1754 static struct addrinfo *
1755 getanswer(const querybuf *answer, int anslen, const char *qname, int qtype,
1756 const struct addrinfo *pai, res_state res)
1757 {
1758 struct addrinfo sentinel, *cur;
1759 struct addrinfo ai;
1760 const struct afd *afd;
1761 char *canonname;
1762 const HEADER *hp;
1763 const u_char *cp;
1764 int n;
1765 const u_char *eom;
1766 char *bp, *ep;
1767 int type, class, ancount, qdcount;
1768 int haveanswer, had_error;
1769 char tbuf[MAXDNAME];
1770 int (*name_ok)(const char *);
1771 char hostbuf[8*1024];
1772
1773 memset(&sentinel, 0, sizeof(sentinel));
1774 cur = &sentinel;
1775
1776 canonname = NULL;
1777 eom = answer->buf + anslen;
1778 switch (qtype) {
1779 case T_A:
1780 case T_AAAA:
1781 case T_ANY: /*use T_ANY only for T_A/T_AAAA lookup*/
1782 name_ok = res_hnok;
1783 break;
1784 default:
1785 return (NULL); /* XXX should be abort(); */
1786 }
1787 /*
1788 * find first satisfactory answer
1789 */
1790 hp = &answer->hdr;
1791 ancount = ntohs(hp->ancount);
1792 qdcount = ntohs(hp->qdcount);
1793 bp = hostbuf;
1794 ep = hostbuf + sizeof hostbuf;
1795 cp = answer->buf + HFIXEDSZ;
1796 if (qdcount != 1) {
1797 RES_SET_H_ERRNO(res, NO_RECOVERY);
1798 return (NULL);
1799 }
1800 n = dn_expand(answer->buf, eom, cp, bp, ep - bp);
1801 if ((n < 0) || !(*name_ok)(bp)) {
1802 RES_SET_H_ERRNO(res, NO_RECOVERY);
1803 return (NULL);
1804 }
1805 cp += n + QFIXEDSZ;
1806 if (qtype == T_A || qtype == T_AAAA || qtype == T_ANY) {
1807 /* res_send() has already verified that the query name is the
1808 * same as the one we sent; this just gets the expanded name
1809 * (i.e., with the succeeding search-domain tacked on).
1810 */
1811 n = strlen(bp) + 1; /* for the \0 */
1812 if (n >= MAXHOSTNAMELEN) {
1813 RES_SET_H_ERRNO(res, NO_RECOVERY);
1814 return (NULL);
1815 }
1816 canonname = bp;
1817 bp += n;
1818 /* The qname can be abbreviated, but h_name is now absolute. */
1819 qname = canonname;
1820 }
1821 haveanswer = 0;
1822 had_error = 0;
1823 while (ancount-- > 0 && cp < eom && !had_error) {
1824 n = dn_expand(answer->buf, eom, cp, bp, ep - bp);
1825 if ((n < 0) || !(*name_ok)(bp)) {
1826 had_error++;
1827 continue;
1828 }
1829 cp += n; /* name */
1830 type = _getshort(cp);
1831 cp += INT16SZ; /* type */
1832 class = _getshort(cp);
1833 cp += INT16SZ + INT32SZ; /* class, TTL */
1834 n = _getshort(cp);
1835 cp += INT16SZ; /* len */
1836 if (class != C_IN) {
1837 /* XXX - debug? syslog? */
1838 cp += n;
1839 continue; /* XXX - had_error++ ? */
1840 }
1841 if ((qtype == T_A || qtype == T_AAAA || qtype == T_ANY) &&
1842 type == T_CNAME) {
1843 n = dn_expand(answer->buf, eom, cp, tbuf, sizeof tbuf);
1844 if ((n < 0) || !(*name_ok)(tbuf)) {
1845 had_error++;
1846 continue;
1847 }
1848 cp += n;
1849 /* Get canonical name. */
1850 n = strlen(tbuf) + 1; /* for the \0 */
1851 if (n > ep - bp || n >= MAXHOSTNAMELEN) {
1852 had_error++;
1853 continue;
1854 }
1855 strlcpy(bp, tbuf, ep - bp);
1856 canonname = bp;
1857 bp += n;
1858 continue;
1859 }
1860 if (qtype == T_ANY) {
1861 if (!(type == T_A || type == T_AAAA)) {
1862 cp += n;
1863 continue;
1864 }
1865 } else if (type != qtype) {
1866 #ifdef DEBUG
1867 if (type != T_KEY && type != T_SIG)
1868 syslog(LOG_NOTICE|LOG_AUTH,
1869 "gethostby*.getanswer: asked for \"%s %s %s\", got type \"%s\"",
1870 qname, p_class(C_IN), p_type(qtype),
1871 p_type(type));
1872 #endif
1873 cp += n;
1874 continue; /* XXX - had_error++ ? */
1875 }
1876 switch (type) {
1877 case T_A:
1878 case T_AAAA:
1879 if (strcasecmp(canonname, bp) != 0) {
1880 #ifdef DEBUG
1881 syslog(LOG_NOTICE|LOG_AUTH,
1882 AskedForGot, canonname, bp);
1883 #endif
1884 cp += n;
1885 continue; /* XXX - had_error++ ? */
1886 }
1887 if (type == T_A && n != INADDRSZ) {
1888 cp += n;
1889 continue;
1890 }
1891 if (type == T_AAAA && n != IN6ADDRSZ) {
1892 cp += n;
1893 continue;
1894 }
1895 #ifdef FILTER_V4MAPPED
1896 if (type == T_AAAA) {
1897 struct in6_addr in6;
1898 memcpy(&in6, cp, sizeof(in6));
1899 if (IN6_IS_ADDR_V4MAPPED(&in6)) {
1900 cp += n;
1901 continue;
1902 }
1903 }
1904 #endif
1905 if (!haveanswer) {
1906 int nn;
1907
1908 canonname = bp;
1909 nn = strlen(bp) + 1; /* for the \0 */
1910 bp += nn;
1911 }
1912
1913 /* don't overwrite pai */
1914 ai = *pai;
1915 ai.ai_family = (type == T_A) ? AF_INET : AF_INET6;
1916 afd = find_afd(ai.ai_family);
1917 if (afd == NULL) {
1918 cp += n;
1919 continue;
1920 }
1921 cur->ai_next = get_ai(&ai, afd, (const char *)cp);
1922 if (cur->ai_next == NULL)
1923 had_error++;
1924 while (cur && cur->ai_next)
1925 cur = cur->ai_next;
1926 cp += n;
1927 break;
1928 default:
1929 abort();
1930 }
1931 if (!had_error)
1932 haveanswer++;
1933 }
1934 if (haveanswer) {
1935 #if defined(RESOLVSORT)
1936 /*
1937 * We support only IPv4 address for backward
1938 * compatibility against gethostbyname(3).
1939 */
1940 if (res->nsort && qtype == T_A) {
1941 if (addr4sort(&sentinel, res) < 0) {
1942 freeaddrinfo(sentinel.ai_next);
1943 RES_SET_H_ERRNO(res, NO_RECOVERY);
1944 return NULL;
1945 }
1946 }
1947 #endif /*RESOLVSORT*/
1948 if (!canonname)
1949 get_canonname(pai, sentinel.ai_next, qname);
1950 else
1951 get_canonname(pai, sentinel.ai_next, canonname);
1952 RES_SET_H_ERRNO(res, NETDB_SUCCESS);
1953 return sentinel.ai_next;
1954 }
1955
1956 RES_SET_H_ERRNO(res, NO_RECOVERY);
1957 return NULL;
1958 }
1959
1960 #ifdef RESOLVSORT
1961 struct addr_ptr {
1962 struct addrinfo *ai;
1963 int aval;
1964 };
1965
1966 static int
1967 addr4sort(struct addrinfo *sentinel, res_state res)
1968 {
1969 struct addrinfo *ai;
1970 struct addr_ptr *addrs, addr;
1971 struct sockaddr_in *sin;
1972 int naddrs, i, j;
1973 int needsort = 0;
1974
1975 if (!sentinel)
1976 return -1;
1977 naddrs = 0;
1978 for (ai = sentinel->ai_next; ai; ai = ai->ai_next)
1979 naddrs++;
1980 if (naddrs < 2)
1981 return 0; /* We don't need sorting. */
1982 if ((addrs = malloc(sizeof(struct addr_ptr) * naddrs)) == NULL)
1983 return -1;
1984 i = 0;
1985 for (ai = sentinel->ai_next; ai; ai = ai->ai_next) {
1986 sin = (struct sockaddr_in *)ai->ai_addr;
1987 for (j = 0; (unsigned)j < res->nsort; j++) {
1988 if (res->sort_list[j].addr.s_addr ==
1989 (sin->sin_addr.s_addr & res->sort_list[j].mask))
1990 break;
1991 }
1992 addrs[i].ai = ai;
1993 addrs[i].aval = j;
1994 if (needsort == 0 && i > 0 && j < addrs[i - 1].aval)
1995 needsort = i;
1996 i++;
1997 }
1998 if (!needsort) {
1999 free(addrs);
2000 return 0;
2001 }
2002
2003 while (needsort < naddrs) {
2004 for (j = needsort - 1; j >= 0; j--) {
2005 if (addrs[j].aval > addrs[j+1].aval) {
2006 addr = addrs[j];
2007 addrs[j] = addrs[j + 1];
2008 addrs[j + 1] = addr;
2009 } else
2010 break;
2011 }
2012 needsort++;
2013 }
2014
2015 ai = sentinel;
2016 for (i = 0; i < naddrs; ++i) {
2017 ai->ai_next = addrs[i].ai;
2018 ai = ai->ai_next;
2019 }
2020 ai->ai_next = NULL;
2021 free(addrs);
2022 return 0;
2023 }
2024 #endif /*RESOLVSORT*/
2025
2026 /*ARGSUSED*/
2027 static int
2028 _dns_getaddrinfo(void *rv, void *cb_data, va_list ap)
2029 {
2030 struct addrinfo *ai;
2031 querybuf *buf, *buf2;
2032 const char *hostname;
2033 const struct addrinfo *pai;
2034 struct addrinfo sentinel, *cur;
2035 struct res_target q, q2;
2036 res_state res;
2037
2038 hostname = va_arg(ap, char *);
2039 pai = va_arg(ap, const struct addrinfo *);
2040
2041 memset(&q, 0, sizeof(q));
2042 memset(&q2, 0, sizeof(q2));
2043 memset(&sentinel, 0, sizeof(sentinel));
2044 cur = &sentinel;
2045
2046 buf = malloc(sizeof(*buf));
2047 if (!buf) {
2048 RES_SET_H_ERRNO(res, NETDB_INTERNAL);
2049 return NS_NOTFOUND;
2050 }
2051 buf2 = malloc(sizeof(*buf2));
2052 if (!buf2) {
2053 free(buf);
2054 RES_SET_H_ERRNO(res, NETDB_INTERNAL);
2055 return NS_NOTFOUND;
2056 }
2057
2058 switch (pai->ai_family) {
2059 case AF_UNSPEC:
2060 q.name = hostname;
2061 q.qclass = C_IN;
2062 q.qtype = T_A;
2063 q.answer = buf->buf;
2064 q.anslen = sizeof(buf->buf);
2065 q.next = &q2;
2066 q2.name = hostname;
2067 q2.qclass = C_IN;
2068 q2.qtype = T_AAAA;
2069 q2.answer = buf2->buf;
2070 q2.anslen = sizeof(buf2->buf);
2071 break;
2072 case AF_INET:
2073 q.name = hostname;
2074 q.qclass = C_IN;
2075 q.qtype = T_A;
2076 q.answer = buf->buf;
2077 q.anslen = sizeof(buf->buf);
2078 break;
2079 case AF_INET6:
2080 q.name = hostname;
2081 q.qclass = C_IN;
2082 q.qtype = T_AAAA;
2083 q.answer = buf->buf;
2084 q.anslen = sizeof(buf->buf);
2085 break;
2086 default:
2087 free(buf);
2088 free(buf2);
2089 return NS_UNAVAIL;
2090 }
2091
2092 res = __res_state();
2093 if ((res->options & RES_INIT) == 0 && res_ninit(res) == -1) {
2094 RES_SET_H_ERRNO(res, NETDB_INTERNAL);
2095 free(buf);
2096 free(buf2);
2097 return NS_NOTFOUND;
2098 }
2099
2100 if (res_searchN(hostname, &q, res) < 0) {
2101 free(buf);
2102 free(buf2);
2103 return NS_NOTFOUND;
2104 }
2105 /* prefer IPv6 */
2106 if (q.next) {
2107 ai = getanswer(buf2, q2.n, q2.name, q2.qtype, pai, res);
2108 if (ai) {
2109 cur->ai_next = ai;
2110 while (cur && cur->ai_next)
2111 cur = cur->ai_next;
2112 }
2113 }
2114 ai = getanswer(buf, q.n, q.name, q.qtype, pai, res);
2115 if (ai)
2116 cur->ai_next = ai;
2117 free(buf);
2118 free(buf2);
2119 if (sentinel.ai_next == NULL)
2120 switch (res->res_h_errno) {
2121 case HOST_NOT_FOUND:
2122 return NS_NOTFOUND;
2123 case TRY_AGAIN:
2124 return NS_TRYAGAIN;
2125 default:
2126 return NS_UNAVAIL;
2127 }
2128 *((struct addrinfo **)rv) = sentinel.ai_next;
2129 return NS_SUCCESS;
2130 }
2131
2132 static void
2133 _sethtent(FILE **hostf)
2134 {
2135 if (!*hostf)
2136 *hostf = fopen(_PATH_HOSTS, "r");
2137 else
2138 rewind(*hostf);
2139 }
2140
2141 static void
2142 _endhtent(FILE **hostf)
2143 {
2144 if (*hostf) {
2145 fclose(*hostf);
2146 *hostf = NULL;
2147 }
2148 }
2149
2150 static struct addrinfo *
2151 _gethtent(FILE **hostf, const char *name, const struct addrinfo *pai)
2152 {
2153 char *p;
2154 char *cp, *tname, *cname;
2155 struct addrinfo hints, *res0, *res;
2156 int error;
2157 const char *addr;
2158 char hostbuf[8*1024];
2159
2160 if (!*hostf && !(*hostf = fopen(_PATH_HOSTS, "r")))
2161 return (NULL);
2162 again:
2163 if (!(p = fgets(hostbuf, sizeof hostbuf, *hostf)))
2164 return (NULL);
2165 if (*p == '#')
2166 goto again;
2167 cp = strpbrk(p, "#\n");
2168 if (cp != NULL)
2169 *cp = '\0';
2170 if (!(cp = strpbrk(p, " \t")))
2171 goto again;
2172 *cp++ = '\0';
2173 addr = p;
2174 cname = NULL;
2175 /* if this is not something we're looking for, skip it. */
2176 while (cp && *cp) {
2177 if (*cp == ' ' || *cp == '\t') {
2178 cp++;
2179 continue;
2180 }
2181 tname = cp;
2182 if (cname == NULL)
2183 cname = cp;
2184 if ((cp = strpbrk(cp, " \t")) != NULL)
2185 *cp++ = '\0';
2186 if (strcasecmp(name, tname) == 0)
2187 goto found;
2188 }
2189 goto again;
2190
2191 found:
2192 /* we should not glob socktype/protocol here */
2193 memset(&hints, 0, sizeof(hints));
2194 hints.ai_family = pai->ai_family;
2195 hints.ai_socktype = SOCK_DGRAM;
2196 hints.ai_protocol = 0;
2197 hints.ai_flags = AI_NUMERICHOST;
2198 error = getaddrinfo(addr, "0", &hints, &res0);
2199 if (error)
2200 goto again;
2201 #ifdef FILTER_V4MAPPED
2202 /* XXX should check all items in the chain */
2203 if (res0->ai_family == AF_INET6 &&
2204 IN6_IS_ADDR_V4MAPPED(&((struct sockaddr_in6 *)res0->ai_addr)->sin6_addr)) {
2205 freeaddrinfo(res0);
2206 goto again;
2207 }
2208 #endif
2209 for (res = res0; res; res = res->ai_next) {
2210 /* cover it up */
2211 res->ai_flags = pai->ai_flags;
2212 res->ai_socktype = pai->ai_socktype;
2213 res->ai_protocol = pai->ai_protocol;
2214
2215 if (pai->ai_flags & AI_CANONNAME) {
2216 if (get_canonname(pai, res, cname) != 0) {
2217 freeaddrinfo(res0);
2218 goto again;
2219 }
2220 }
2221 }
2222 return res0;
2223 }
2224
2225 /*ARGSUSED*/
2226 static int
2227 _files_getaddrinfo(void *rv, void *cb_data, va_list ap)
2228 {
2229 const char *name;
2230 const struct addrinfo *pai;
2231 struct addrinfo sentinel, *cur;
2232 struct addrinfo *p;
2233 FILE *hostf = NULL;
2234
2235 name = va_arg(ap, char *);
2236 pai = va_arg(ap, struct addrinfo *);
2237
2238 memset(&sentinel, 0, sizeof(sentinel));
2239 cur = &sentinel;
2240
2241 _sethtent(&hostf);
2242 while ((p = _gethtent(&hostf, name, pai)) != NULL) {
2243 cur->ai_next = p;
2244 while (cur && cur->ai_next)
2245 cur = cur->ai_next;
2246 }
2247 _endhtent(&hostf);
2248
2249 *((struct addrinfo **)rv) = sentinel.ai_next;
2250 if (sentinel.ai_next == NULL)
2251 return NS_NOTFOUND;
2252 return NS_SUCCESS;
2253 }
2254
2255 #ifdef YP
2256 /*ARGSUSED*/
2257 static struct addrinfo *
2258 _yphostent(char *line, const struct addrinfo *pai)
2259 {
2260 struct addrinfo sentinel, *cur;
2261 struct addrinfo hints, *res, *res0;
2262 int error;
2263 char *p = line;
2264 const char *addr, *canonname;
2265 char *nextline;
2266 char *cp;
2267
2268 addr = canonname = NULL;
2269
2270 memset(&sentinel, 0, sizeof(sentinel));
2271 cur = &sentinel;
2272
2273 nextline:
2274 /* terminate line */
2275 cp = strchr(p, '\n');
2276 if (cp) {
2277 *cp++ = '\0';
2278 nextline = cp;
2279 } else
2280 nextline = NULL;
2281
2282 cp = strpbrk(p, " \t");
2283 if (cp == NULL) {
2284 if (canonname == NULL)
2285 return (NULL);
2286 else
2287 goto done;
2288 }
2289 *cp++ = '\0';
2290
2291 addr = p;
2292
2293 while (cp && *cp) {
2294 if (*cp == ' ' || *cp == '\t') {
2295 cp++;
2296 continue;
2297 }
2298 if (!canonname)
2299 canonname = cp;
2300 if ((cp = strpbrk(cp, " \t")) != NULL)
2301 *cp++ = '\0';
2302 }
2303
2304 hints = *pai;
2305 hints.ai_flags = AI_NUMERICHOST;
2306 error = getaddrinfo(addr, NULL, &hints, &res0);
2307 if (error == 0) {
2308 for (res = res0; res; res = res->ai_next) {
2309 /* cover it up */
2310 res->ai_flags = pai->ai_flags;
2311
2312 if (pai->ai_flags & AI_CANONNAME)
2313 get_canonname(pai, res, canonname);
2314 }
2315 } else
2316 res0 = NULL;
2317 if (res0) {
2318 cur->ai_next = res0;
2319 while (cur && cur->ai_next)
2320 cur = cur->ai_next;
2321 }
2322
2323 if (nextline) {
2324 p = nextline;
2325 goto nextline;
2326 }
2327
2328 done:
2329 return sentinel.ai_next;
2330 }
2331
2332 /*ARGSUSED*/
2333 static int
2334 _yp_getaddrinfo(void *rv, void *cb_data, va_list ap)
2335 {
2336 struct addrinfo sentinel, *cur;
2337 struct addrinfo *ai = NULL;
2338 char *ypbuf;
2339 int ypbuflen, r;
2340 const char *name;
2341 const struct addrinfo *pai;
2342 char *ypdomain;
2343
2344 if (_yp_check(&ypdomain) == 0)
2345 return NS_UNAVAIL;
2346
2347 name = va_arg(ap, char *);
2348 pai = va_arg(ap, const struct addrinfo *);
2349
2350 memset(&sentinel, 0, sizeof(sentinel));
2351 cur = &sentinel;
2352
2353 /* hosts.byname is only for IPv4 (Solaris8) */
2354 if (pai->ai_family == PF_UNSPEC || pai->ai_family == PF_INET) {
2355 r = yp_match(ypdomain, "hosts.byname", name,
2356 (int)strlen(name), &ypbuf, &ypbuflen);
2357 if (r == 0) {
2358 struct addrinfo ai4;
2359
2360 ai4 = *pai;
2361 ai4.ai_family = AF_INET;
2362 ai = _yphostent(ypbuf, &ai4);
2363 if (ai) {
2364 cur->ai_next = ai;
2365 while (cur && cur->ai_next)
2366 cur = cur->ai_next;
2367 }
2368 free(ypbuf);
2369 }
2370 }
2371
2372 /* ipnodes.byname can hold both IPv4/v6 */
2373 r = yp_match(ypdomain, "ipnodes.byname", name,
2374 (int)strlen(name), &ypbuf, &ypbuflen);
2375 if (r == 0) {
2376 ai = _yphostent(ypbuf, pai);
2377 if (ai)
2378 cur->ai_next = ai;
2379 free(ypbuf);
2380 }
2381
2382 if (sentinel.ai_next == NULL) {
2383 RES_SET_H_ERRNO(__res_state(), HOST_NOT_FOUND);
2384 return NS_NOTFOUND;
2385 }
2386 *((struct addrinfo **)rv) = sentinel.ai_next;
2387 return NS_SUCCESS;
2388 }
2389 #endif
2390
2391 /* resolver logic */
2392
2393 /*
2394 * Formulate a normal query, send, and await answer.
2395 * Returned answer is placed in supplied buffer "answer".
2396 * Perform preliminary check of answer, returning success only
2397 * if no error is indicated and the answer count is nonzero.
2398 * Return the size of the response on success, -1 on error.
2399 * Error number is left in h_errno.
2400 *
2401 * Caller must parse answer and determine whether it answers the question.
2402 */
2403 static int
2404 res_queryN(const char *name, struct res_target *target, res_state res)
2405 {
2406 u_char *buf;
2407 HEADER *hp;
2408 int n;
2409 u_int oflags;
2410 struct res_target *t;
2411 int rcode;
2412 int ancount;
2413
2414 rcode = NOERROR;
2415 ancount = 0;
2416
2417 buf = malloc(MAXPACKET);
2418 if (!buf) {
2419 RES_SET_H_ERRNO(res, NETDB_INTERNAL);
2420 return -1;
2421 }
2422
2423 for (t = target; t; t = t->next) {
2424 int class, type;
2425 u_char *answer;
2426 int anslen;
2427
2428 hp = (HEADER *)(void *)t->answer;
2429
2430 /* make it easier... */
2431 class = t->qclass;
2432 type = t->qtype;
2433 answer = t->answer;
2434 anslen = t->anslen;
2435
2436 oflags = res->_flags;
2437
2438 again:
2439 hp->rcode = NOERROR; /* default */
2440
2441 #ifdef DEBUG
2442 if (res->options & RES_DEBUG)
2443 printf(";; res_query(%s, %d, %d)\n", name, class, type);
2444 #endif
2445
2446 n = res_nmkquery(res, QUERY, name, class, type, NULL, 0, NULL,
2447 buf, MAXPACKET);
2448 if (n > 0 && (res->_flags & RES_F_EDNS0ERR) == 0 &&
2449 (res->options & (RES_USE_EDNS0|RES_USE_DNSSEC)) != 0U)
2450 n = res_nopt(res, n, buf, MAXPACKET, anslen);
2451 if (n <= 0) {
2452 #ifdef DEBUG
2453 if (res->options & RES_DEBUG)
2454 printf(";; res_query: mkquery failed\n");
2455 #endif
2456 free(buf);
2457 RES_SET_H_ERRNO(res, NO_RECOVERY);
2458 return (n);
2459 }
2460 n = res_nsend(res, buf, n, answer, anslen);
2461 if (n < 0) {
2462 /*
2463 * if the query choked with EDNS0, retry
2464 * without EDNS0
2465 */
2466 if ((res->options & (RES_USE_EDNS0|RES_USE_DNSSEC))
2467 != 0U &&
2468 ((oflags ^ res->_flags) & RES_F_EDNS0ERR) != 0) {
2469 res->_flags |= RES_F_EDNS0ERR;
2470 if (res->options & RES_DEBUG)
2471 printf(";; res_nquery: retry without EDNS0\n");
2472 goto again;
2473 }
2474 rcode = hp->rcode; /* record most recent error */
2475 #ifdef DEBUG
2476 if (res->options & RES_DEBUG)
2477 printf(";; res_query: send error\n");
2478 #endif
2479 continue;
2480 }
2481
2482 if (n > anslen)
2483 hp->rcode = FORMERR; /* XXX not very informative */
2484 if (hp->rcode != NOERROR || ntohs(hp->ancount) == 0) {
2485 rcode = hp->rcode; /* record most recent error */
2486 #ifdef DEBUG
2487 if (res->options & RES_DEBUG)
2488 printf(";; rcode = %u, ancount=%u\n", hp->rcode,
2489 ntohs(hp->ancount));
2490 #endif
2491 continue;
2492 }
2493
2494 ancount += ntohs(hp->ancount);
2495
2496 t->n = n;
2497 }
2498
2499 free(buf);
2500
2501 if (ancount == 0) {
2502 switch (rcode) {
2503 case NXDOMAIN:
2504 RES_SET_H_ERRNO(res, HOST_NOT_FOUND);
2505 break;
2506 case SERVFAIL:
2507 RES_SET_H_ERRNO(res, TRY_AGAIN);
2508 break;
2509 case NOERROR:
2510 RES_SET_H_ERRNO(res, NO_DATA);
2511 break;
2512 case FORMERR:
2513 case NOTIMP:
2514 case REFUSED:
2515 default:
2516 RES_SET_H_ERRNO(res, NO_RECOVERY);
2517 break;
2518 }
2519 return (-1);
2520 }
2521 return (ancount);
2522 }
2523
2524 /*
2525 * Formulate a normal query, send, and retrieve answer in supplied buffer.
2526 * Return the size of the response on success, -1 on error.
2527 * If enabled, implement search rules until answer or unrecoverable failure
2528 * is detected. Error code, if any, is left in h_errno.
2529 */
2530 static int
2531 res_searchN(const char *name, struct res_target *target, res_state res)
2532 {
2533 const char *cp, * const *domain;
2534 HEADER *hp = (HEADER *)(void *)target->answer; /*XXX*/
2535 u_int dots;
2536 int trailing_dot, ret, saved_herrno;
2537 int got_nodata = 0, got_servfail = 0, root_on_list = 0;
2538 int tried_as_is = 0;
2539 int searched = 0;
2540 char abuf[MAXDNAME];
2541
2542 errno = 0;
2543 RES_SET_H_ERRNO(res, HOST_NOT_FOUND); /* default, if we never query */
2544 dots = 0;
2545 for (cp = name; *cp; cp++)
2546 dots += (*cp == '.');
2547 trailing_dot = 0;
2548 if (cp > name && *--cp == '.')
2549 trailing_dot++;
2550
2551 /*
2552 * if there aren't any dots, it could be a user-level alias
2553 */
2554 if (!dots &&
2555 (cp = res_hostalias(res, name, abuf, sizeof(abuf))) != NULL)
2556 return (res_queryN(cp, target, res));
2557
2558 /*
2559 * If there are enough dots in the name, let's just give it a
2560 * try 'as is'. The threshold can be set with the "ndots" option.
2561 * Also, query 'as is', if there is a trailing dot in the name.
2562 */
2563 saved_herrno = -1;
2564 if (dots >= res->ndots || trailing_dot) {
2565 ret = res_querydomainN(name, NULL, target, res);
2566 if (ret > 0 || trailing_dot)
2567 return (ret);
2568 if (errno == ECONNREFUSED) {
2569 RES_SET_H_ERRNO(res, TRY_AGAIN);
2570 return (-1);
2571 }
2572 switch (res->res_h_errno) {
2573 case NO_DATA:
2574 case HOST_NOT_FOUND:
2575 break;
2576 case TRY_AGAIN:
2577 if (hp->rcode == SERVFAIL)
2578 break;
2579 /* FALLTHROUGH */
2580 default:
2581 return (-1);
2582 }
2583 saved_herrno = res->res_h_errno;
2584 tried_as_is++;
2585 }
2586
2587 /*
2588 * We do at least one level of search if
2589 * - there is no dot and RES_DEFNAME is set, or
2590 * - there is at least one dot, there is no trailing dot,
2591 * and RES_DNSRCH is set.
2592 */
2593 if ((!dots && (res->options & RES_DEFNAMES)) ||
2594 (dots && !trailing_dot && (res->options & RES_DNSRCH))) {
2595 int done = 0;
2596
2597 for (domain = (const char * const *)res->dnsrch;
2598 *domain && !done;
2599 domain++) {
2600 searched = 1;
2601
2602 if (domain[0][0] == '\0' ||
2603 (domain[0][0] == '.' && domain[0][1] == '\0'))
2604 root_on_list++;
2605
2606 if (root_on_list && tried_as_is)
2607 continue;
2608
2609 ret = res_querydomainN(name, *domain, target, res);
2610 if (ret > 0)
2611 return (ret);
2612
2613 /*
2614 * If no server present, give up.
2615 * If name isn't found in this domain,
2616 * keep trying higher domains in the search list
2617 * (if that's enabled).
2618 * On a NO_DATA error, keep trying, otherwise
2619 * a wildcard entry of another type could keep us
2620 * from finding this entry higher in the domain.
2621 * If we get some other error (negative answer or
2622 * server failure), then stop searching up,
2623 * but try the input name below in case it's
2624 * fully-qualified.
2625 */
2626 if (errno == ECONNREFUSED) {
2627 RES_SET_H_ERRNO(res, TRY_AGAIN);
2628 return (-1);
2629 }
2630
2631 switch (res->res_h_errno) {
2632 case NO_DATA:
2633 got_nodata++;
2634 /* FALLTHROUGH */
2635 case HOST_NOT_FOUND:
2636 /* keep trying */
2637 break;
2638 case TRY_AGAIN:
2639 got_servfail++;
2640 if (hp->rcode == SERVFAIL) {
2641 /* try next search element, if any */
2642 break;
2643 }
2644 /* FALLTHROUGH */
2645 default:
2646 /* anything else implies that we're done */
2647 done++;
2648 }
2649 /*
2650 * if we got here for some reason other than DNSRCH,
2651 * we only wanted one iteration of the loop, so stop.
2652 */
2653 if (!(res->options & RES_DNSRCH))
2654 done++;
2655 }
2656 }
2657
2658 switch (res->res_h_errno) {
2659 case NO_DATA:
2660 case HOST_NOT_FOUND:
2661 break;
2662 case TRY_AGAIN:
2663 if (hp->rcode == SERVFAIL)
2664 break;
2665 /* FALLTHROUGH */
2666 default:
2667 goto giveup;
2668 }
2669
2670 /*
2671 * If the query has not already been tried as is then try it
2672 * unless RES_NOTLDQUERY is set and there were no dots.
2673 */
2674 if ((dots || !searched || !(res->options & RES_NOTLDQUERY)) &&
2675 !(tried_as_is || root_on_list)) {
2676 ret = res_querydomainN(name, NULL, target, res);
2677 if (ret > 0)
2678 return (ret);
2679 }
2680
2681 /*
2682 * if we got here, we didn't satisfy the search.
2683 * if we did an initial full query, return that query's h_errno
2684 * (note that we wouldn't be here if that query had succeeded).
2685 * else if we ever got a nodata, send that back as the reason.
2686 * else send back meaningless h_errno, that being the one from
2687 * the last DNSRCH we did.
2688 */
2689 giveup:
2690 if (saved_herrno != -1)
2691 RES_SET_H_ERRNO(res, saved_herrno);
2692 else if (got_nodata)
2693 RES_SET_H_ERRNO(res, NO_DATA);
2694 else if (got_servfail)
2695 RES_SET_H_ERRNO(res, TRY_AGAIN);
2696 return (-1);
2697 }
2698
2699 /*
2700 * Perform a call on res_query on the concatenation of name and domain,
2701 * removing a trailing dot from name if domain is NULL.
2702 */
2703 static int
2704 res_querydomainN(const char *name, const char *domain,
2705 struct res_target *target, res_state res)
2706 {
2707 char nbuf[MAXDNAME];
2708 const char *longname = nbuf;
2709 size_t n, d;
2710
2711 #ifdef DEBUG
2712 if (res->options & RES_DEBUG)
2713 printf(";; res_querydomain(%s, %s)\n",
2714 name, domain?domain:"<Nil>");
2715 #endif
2716 if (domain == NULL) {
2717 /*
2718 * Check for trailing '.';
2719 * copy without '.' if present.
2720 */
2721 n = strlen(name);
2722 if (n >= MAXDNAME) {
2723 RES_SET_H_ERRNO(res, NO_RECOVERY);
2724 return (-1);
2725 }
2726 if (n > 0 && name[--n] == '.') {
2727 strncpy(nbuf, name, n);
2728 nbuf[n] = '\0';
2729 } else
2730 longname = name;
2731 } else {
2732 n = strlen(name);
2733 d = strlen(domain);
2734 if (n + d + 1 >= MAXDNAME) {
2735 RES_SET_H_ERRNO(res, NO_RECOVERY);
2736 return (-1);
2737 }
2738 snprintf(nbuf, sizeof(nbuf), "%s.%s", name, domain);
2739 }
2740 return (res_queryN(longname, target, res));
2741 }
DragonFly BSD