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libc/libpthread: Add clock_getcpuclockid() and pthread_getcpuclockid().
[dragonfly.git] / lib / libc / net / getaddrinfo.c
blobf64c360eabed0862d05a0e2c5b6c78020151967d
1 /* $FreeBSD: src/lib/libc/net/getaddrinfo.c,v 1.87 2008/02/03 19:07:55 ume Exp $ */
2 /* $KAME: getaddrinfo.c,v 1.15 2000/07/09 04:37:24 itojun Exp $ */
3
4 /*
5 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. Neither the name of the project nor the names of its contributors
17 * may be used to endorse or promote products derived from this software
18 * without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 */
32
33 /*
34 * "#ifdef FAITH" part is local hack for supporting IPv4-v6 translator.
35 *
36 * Issues to be discussed:
37 * - Return values. There are nonstandard return values defined and used
38 * in the source code. This is because RFC2553 is silent about which error
39 * code must be returned for which situation.
40 * - freeaddrinfo(NULL). RFC2553 is silent about it. XNET 5.2 says it is
41 * invalid. current code - SEGV on freeaddrinfo(NULL)
42 *
43 * Note:
44 * - The code filters out AFs that are not supported by the kernel,
45 * when globbing NULL hostname (to loopback, or wildcard). Is it the right
46 * thing to do? What is the relationship with post-RFC2553 AI_ADDRCONFIG
47 * in ai_flags?
48 * - (post-2553) semantics of AI_ADDRCONFIG itself is too vague.
49 * (1) what should we do against numeric hostname (2) what should we do
50 * against NULL hostname (3) what is AI_ADDRCONFIG itself. AF not ready?
51 * non-loopback address configured? global address configured?
52 *
53 * OS specific notes for freebsd4:
54 * - FreeBSD supported $GAI. The code does not.
55 */
56
57 #include "namespace.h"
58 #include <sys/types.h>
59 #include <sys/param.h>
60 #include <sys/socket.h>
61 #include <net/if.h>
62 #include <netinet/in.h>
63 #include <sys/queue.h>
64 #ifdef INET6
65 #include <net/if_var.h>
66 #include <sys/sysctl.h>
67 #include <sys/ioctl.h>
68 #include <netinet6/in6_var.h> /* XXX */
69 #endif
70 #include <arpa/inet.h>
71 #include <arpa/nameser.h>
72 #include <rpc/rpc.h>
73 #include <rpcsvc/yp_prot.h>
74 #include <rpcsvc/ypclnt.h>
75 #include <netdb.h>
76 #include <resolv.h>
77 #include <string.h>
78 #include <stdlib.h>
79 #include <stddef.h>
80 #include <ctype.h>
81 #include <unistd.h>
82 #include <stdio.h>
83 #include <errno.h>
84
85 #include "res_config.h"
86
87 #ifdef DEBUG
88 #include <syslog.h>
89 #endif
90
91 #include <stdarg.h>
92 #include <nsswitch.h>
93 #include "un-namespace.h"
94 #include "libc_private.h"
95 #ifdef NS_CACHING
96 #include "nscache.h"
97 #endif
98
99 #if defined(__KAME__) && defined(INET6)
100 # define FAITH
101 #endif
102
103 #define SUCCESS 0
104 #define ANY 0
105 #define YES 1
106 #define NO 0
107
108 static const char in_addrany[] = { 0, 0, 0, 0 };
109 static const char in_loopback[] = { 127, 0, 0, 1 };
110 #ifdef INET6
111 static const char in6_addrany[] = {
112 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
113 };
114 static const char in6_loopback[] = {
115 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1
116 };
117 #endif
118
119 struct policyqueue {
120 TAILQ_ENTRY(policyqueue) pc_entry;
121 #ifdef INET6
122 struct in6_addrpolicy pc_policy;
123 #endif
124 };
125 TAILQ_HEAD(policyhead, policyqueue);
126
127 static const struct afd {
128 int a_af;
129 int a_addrlen;
130 socklen_t a_socklen;
131 int a_off;
132 const char *a_addrany;
133 const char *a_loopback;
134 int a_scoped;
135 } afdl [] = {
136 #ifdef INET6
137 #define N_INET6 0
138 {PF_INET6, sizeof(struct in6_addr),
139 sizeof(struct sockaddr_in6),
140 offsetof(struct sockaddr_in6, sin6_addr),
141 in6_addrany, in6_loopback, 1},
142 #define N_INET 1
143 #else
144 #define N_INET 0
145 #endif
146 {PF_INET, sizeof(struct in_addr),
147 sizeof(struct sockaddr_in),
148 offsetof(struct sockaddr_in, sin_addr),
149 in_addrany, in_loopback, 0},
150 {0, 0, 0, 0, NULL, NULL, 0},
151 };
152
153 struct explore {
154 int e_af;
155 int e_socktype;
156 int e_protocol;
157 const char *e_protostr;
158 int e_wild;
159 #define WILD_AF(ex) ((ex)->e_wild & 0x01)
160 #define WILD_SOCKTYPE(ex) ((ex)->e_wild & 0x02)
161 #define WILD_PROTOCOL(ex) ((ex)->e_wild & 0x04)
162 };
163
164 static const struct explore explore[] = {
165 #if 0
166 { PF_LOCAL, 0, ANY, ANY, NULL, 0x01 },
167 #endif
168 #ifdef INET6
169 { PF_INET6, SOCK_DGRAM, IPPROTO_UDP, "udp", 0x07 },
170 { PF_INET6, SOCK_STREAM, IPPROTO_TCP, "tcp", 0x07 },
171 { PF_INET6, SOCK_RAW, ANY, NULL, 0x05 },
172 #endif
173 { PF_INET, SOCK_DGRAM, IPPROTO_UDP, "udp", 0x07 },
174 { PF_INET, SOCK_STREAM, IPPROTO_TCP, "tcp", 0x07 },
175 { PF_INET, SOCK_RAW, ANY, NULL, 0x05 },
176 { PF_UNSPEC, SOCK_DGRAM, IPPROTO_UDP, "udp", 0x07 },
177 { PF_UNSPEC, SOCK_STREAM, IPPROTO_TCP, "tcp", 0x07 },
178 { PF_UNSPEC, SOCK_RAW, ANY, NULL, 0x05 },
179 { -1, 0, 0, NULL, 0 },
180 };
181
182 #ifdef INET6
183 #define PTON_MAX 16
184 #else
185 #define PTON_MAX 4
186 #endif
187
188 #define AIO_SRCFLAG_DEPRECATED 0x1
189
190 struct ai_order {
191 union {
192 struct sockaddr_storage aiou_ss;
193 struct sockaddr aiou_sa;
194 } aio_src_un;
195 #define aio_srcsa aio_src_un.aiou_sa
196 u_int32_t aio_srcflag;
197 int aio_srcscope;
198 int aio_dstscope;
199 struct policyqueue *aio_srcpolicy;
200 struct policyqueue *aio_dstpolicy;
201 struct addrinfo *aio_ai;
202 int aio_matchlen;
203 };
204
205 static const ns_src default_dns_files[] = {
206 { NSSRC_FILES, NS_SUCCESS },
207 { NSSRC_DNS, NS_SUCCESS },
208 { 0 }
209 };
210
211 struct res_target {
212 struct res_target *next;
213 const char *name; /* domain name */
214 int qclass, qtype; /* class and type of query */
215 u_char *answer; /* buffer to put answer */
216 int anslen; /* size of answer buffer */
217 int n; /* result length */
218 };
219
220 #define MAXPACKET (64*1024)
221
222 typedef union {
223 HEADER hdr;
224 u_char buf[MAXPACKET];
225 } querybuf;
226
227 static int str2number(const char *, int *);
228 static int explore_null(const struct addrinfo *,
229 const char *, struct addrinfo **);
230 static int explore_numeric(const struct addrinfo *, const char *,
231 const char *, struct addrinfo **, const char *);
232 static int explore_numeric_scope(const struct addrinfo *, const char *,
233 const char *, struct addrinfo **);
234 static int get_canonname(const struct addrinfo *,
235 struct addrinfo *, const char *);
236 static struct addrinfo *get_ai(const struct addrinfo *,
237 const struct afd *, const char *);
238 static int get_portmatch(const struct addrinfo *, const char *);
239 static int get_port(struct addrinfo *, const char *, int);
240 static const struct afd *find_afd(int);
241 static int addrconfig(struct addrinfo *);
242 static void set_source(struct ai_order *, struct policyhead *);
243 static int comp_dst(const void *, const void *);
244 #ifdef INET6
245 static int ip6_str2scopeid(char *, struct sockaddr_in6 *, u_int32_t *);
246 #endif
247 static int gai_addr2scopetype(struct sockaddr *);
248
249 static int explore_fqdn(const struct addrinfo *, const char *,
250 const char *, struct addrinfo **);
251
252 static int reorder(struct addrinfo *);
253 static int get_addrselectpolicy(struct policyhead *);
254 static void free_addrselectpolicy(struct policyhead *);
255 static struct policyqueue *match_addrselectpolicy(struct sockaddr *,
256 struct policyhead *);
257 static int matchlen(struct sockaddr *, struct sockaddr *);
258
259 static struct addrinfo *getanswer(const querybuf *, int, const char *, int,
260 const struct addrinfo *, res_state);
261 #if defined(RESOLVSORT)
262 static int addr4sort(struct addrinfo *, res_state);
263 #endif
264 static int _dns_getaddrinfo(void *, void *, va_list);
265 static void _sethtent(FILE **);
266 static void _endhtent(FILE **);
267 static struct addrinfo *_gethtent(FILE **, const char *,
268 const struct addrinfo *);
269 static int _files_getaddrinfo(void *, void *, va_list);
270 #ifdef YP
271 static struct addrinfo *_yphostent(char *, const struct addrinfo *);
272 static int _yp_getaddrinfo(void *, void *, va_list);
273 #endif
274 #ifdef NS_CACHING
275 static int addrinfo_id_func(char *, size_t *, va_list, void *);
276 static int addrinfo_marshal_func(char *, size_t *, void *, va_list,
277 void *);
278 static int addrinfo_unmarshal_func(char *, size_t, void *, va_list,
279 void *);
280 #endif
281
282 static int res_queryN(const char *, struct res_target *, res_state);
283 static int res_searchN(const char *, struct res_target *, res_state);
284 static int res_querydomainN(const char *, const char *,
285 struct res_target *, res_state);
286
287 /* XXX macros that make external reference is BAD. */
288
289 #define GET_AI(ai, afd, addr) \
290 do { \
291 /* external reference: pai, error, and label free */ \
292 (ai) = get_ai(pai, (afd), (addr)); \
293 if ((ai) == NULL) { \
294 error = EAI_MEMORY; \
295 goto free; \
296 } \
297 } while (/*CONSTCOND*/0)
298
299 #define GET_PORT(ai, serv) \
300 do { \
301 /* external reference: error and label free */ \
302 error = get_port((ai), (serv), 0); \
303 if (error != 0) \
304 goto free; \
305 } while (/*CONSTCOND*/0)
306
307 #define GET_CANONNAME(ai, str) \
308 do { \
309 /* external reference: pai, error and label free */ \
310 error = get_canonname(pai, (ai), (str)); \
311 if (error != 0) \
312 goto free; \
313 } while (/*CONSTCOND*/0)
314
315 #define ERR(err) \
316 do { \
317 /* external reference: error, and label bad */ \
318 error = (err); \
319 goto bad; \
320 /*NOTREACHED*/ \
321 } while (/*CONSTCOND*/0)
322
323 #define MATCH_FAMILY(x, y, w) \
324 ((x) == (y) || (/*CONSTCOND*/(w) && ((x) == PF_UNSPEC || (y) == PF_UNSPEC)))
325 #define MATCH(x, y, w) \
326 ((x) == (y) || (/*CONSTCOND*/(w) && ((x) == ANY || (y) == ANY)))
327
328 void
329 freeaddrinfo(struct addrinfo *ai)
330 {
331 struct addrinfo *next;
332
333 do {
334 next = ai->ai_next;
335 if (ai->ai_canonname)
336 free(ai->ai_canonname);
337 /* no need to free(ai->ai_addr) */
338 free(ai);
339 ai = next;
340 } while (ai);
341 }
342
343 static int
344 str2number(const char *p, int *portp)
345 {
346 char *ep;
347 unsigned long v;
348
349 if (*p == '\0')
350 return -1;
351 ep = NULL;
352 errno = 0;
353 v = strtoul(p, &ep, 10);
354 if (errno == 0 && ep && *ep == '\0' && v <= UINT_MAX) {
355 *portp = v;
356 return 0;
357 } else
358 return -1;
359 }
360
361 int
362 getaddrinfo(const char *hostname, const char *servname,
363 const struct addrinfo *hints, struct addrinfo **res)
364 {
365 struct addrinfo sentinel;
366 struct addrinfo *cur;
367 int error = 0;
368 struct addrinfo ai;
369 struct addrinfo ai0;
370 struct addrinfo *pai;
371 const struct explore *ex;
372 int numeric = 0;
373
374 memset(&sentinel, 0, sizeof(sentinel));
375 cur = &sentinel;
376 pai = &ai;
377 pai->ai_flags = 0;
378 pai->ai_family = PF_UNSPEC;
379 pai->ai_socktype = ANY;
380 pai->ai_protocol = ANY;
381 pai->ai_addrlen = 0;
382 pai->ai_canonname = NULL;
383 pai->ai_addr = NULL;
384 pai->ai_next = NULL;
385
386 if (hostname == NULL && servname == NULL)
387 return EAI_NONAME;
388 if (hints) {
389 /* error check for hints */
390 if (hints->ai_addrlen || hints->ai_canonname ||
391 hints->ai_addr || hints->ai_next)
392 ERR(EAI_BADHINTS); /* xxx */
393 if (hints->ai_flags & ~AI_MASK)
394 ERR(EAI_BADFLAGS);
395 switch (hints->ai_family) {
396 case PF_UNSPEC:
397 case PF_INET:
398 #ifdef INET6
399 case PF_INET6:
400 #endif
401 break;
402 default:
403 ERR(EAI_FAMILY);
404 }
405 memcpy(pai, hints, sizeof(*pai));
406
407 /*
408 * if both socktype/protocol are specified, check if they
409 * are meaningful combination.
410 */
411 if (pai->ai_socktype != ANY && pai->ai_protocol != ANY) {
412 for (ex = explore; ex->e_af >= 0; ex++) {
413 if (pai->ai_family != ex->e_af)
414 continue;
415 if (ex->e_socktype == ANY)
416 continue;
417 if (ex->e_protocol == ANY)
418 continue;
419 if (pai->ai_socktype == ex->e_socktype &&
420 pai->ai_protocol != ex->e_protocol) {
421 ERR(EAI_BADHINTS);
422 }
423 }
424 }
425 }
426
427 /*
428 * check for special cases. (1) numeric servname is disallowed if
429 * socktype/protocol are left unspecified. (2) servname is disallowed
430 * for raw and other inet{,6} sockets.
431 */
432 if (MATCH_FAMILY(pai->ai_family, PF_INET, 1)
433 #ifdef PF_INET6
434 || MATCH_FAMILY(pai->ai_family, PF_INET6, 1)
435 #endif
436 ) {
437 ai0 = *pai; /* backup *pai */
438
439 if (pai->ai_family == PF_UNSPEC) {
440 #ifdef PF_INET6
441 pai->ai_family = PF_INET6;
442 #else
443 pai->ai_family = PF_INET;
444 #endif
445 }
446 error = get_portmatch(pai, servname);
447 if (error)
448 ERR(error);
449
450 *pai = ai0;
451 }
452
453 ai0 = *pai;
454
455 /* NULL hostname, or numeric hostname */
456 for (ex = explore; ex->e_af >= 0; ex++) {
457 *pai = ai0;
458
459 /* PF_UNSPEC entries are prepared for DNS queries only */
460 if (ex->e_af == PF_UNSPEC)
461 continue;
462
463 if (!MATCH_FAMILY(pai->ai_family, ex->e_af, WILD_AF(ex)))
464 continue;
465 if (!MATCH(pai->ai_socktype, ex->e_socktype, WILD_SOCKTYPE(ex)))
466 continue;
467 if (!MATCH(pai->ai_protocol, ex->e_protocol, WILD_PROTOCOL(ex)))
468 continue;
469
470 if (pai->ai_family == PF_UNSPEC)
471 pai->ai_family = ex->e_af;
472 if (pai->ai_socktype == ANY && ex->e_socktype != ANY)
473 pai->ai_socktype = ex->e_socktype;
474 if (pai->ai_protocol == ANY && ex->e_protocol != ANY)
475 pai->ai_protocol = ex->e_protocol;
476
477 if (hostname == NULL)
478 error = explore_null(pai, servname, &cur->ai_next);
479 else
480 error = explore_numeric_scope(pai, hostname, servname,
481 &cur->ai_next);
482
483 if (error)
484 goto free;
485
486 while (cur && cur->ai_next)
487 cur = cur->ai_next;
488 }
489
490 /*
491 * XXX
492 * If numreic representation of AF1 can be interpreted as FQDN
493 * representation of AF2, we need to think again about the code below.
494 */
495 if (sentinel.ai_next) {
496 numeric = 1;
497 goto good;
498 }
499
500 if (hostname == NULL)
501 ERR(EAI_NONAME); /* used to be EAI_NODATA */
502 if (pai->ai_flags & AI_NUMERICHOST)
503 ERR(EAI_NONAME);
504
505 if ((pai->ai_flags & AI_ADDRCONFIG) != 0 && !addrconfig(&ai0))
506 ERR(EAI_FAIL);
507
508 /*
509 * hostname as alphabetical name.
510 * we would like to prefer AF_INET6 than AF_INET, so we'll make a
511 * outer loop by AFs.
512 */
513 for (ex = explore; ex->e_af >= 0; ex++) {
514 *pai = ai0;
515
516 /* require exact match for family field */
517 if (pai->ai_family != ex->e_af)
518 continue;
519
520 if (!MATCH(pai->ai_socktype, ex->e_socktype,
521 WILD_SOCKTYPE(ex))) {
522 continue;
523 }
524 if (!MATCH(pai->ai_protocol, ex->e_protocol,
525 WILD_PROTOCOL(ex))) {
526 continue;
527 }
528
529 if (pai->ai_socktype == ANY && ex->e_socktype != ANY)
530 pai->ai_socktype = ex->e_socktype;
531 if (pai->ai_protocol == ANY && ex->e_protocol != ANY)
532 pai->ai_protocol = ex->e_protocol;
533
534 error = explore_fqdn(pai, hostname, servname, &cur->ai_next);
535
536 while (cur && cur->ai_next)
537 cur = cur->ai_next;
538 }
539
540 /* XXX inhibit errors if we have the result */
541 if (sentinel.ai_next)
542 error = 0;
543
544 good:
545 /*
546 * ensure we return either:
547 * - error == 0, non-NULL *res
548 * - error != 0, NULL *res
549 */
550 if (error == 0) {
551 if (sentinel.ai_next) {
552 /*
553 * If the returned entry is for an active connection,
554 * and the given name is not numeric, reorder the
555 * list, so that the application would try the list
556 * in the most efficient order. Since the head entry
557 * of the original list may contain ai_canonname and
558 * that entry may be moved elsewhere in the new list,
559 * we keep the pointer and will restore it in the new
560 * head entry. (Note that RFC3493 requires the head
561 * entry store it when requested by the caller).
562 */
563 if (hints == NULL || !(hints->ai_flags & AI_PASSIVE)) {
564 if (!numeric) {
565 char *canonname;
566
567 canonname =
568 sentinel.ai_next->ai_canonname;
569 sentinel.ai_next->ai_canonname = NULL;
570 reorder(&sentinel);
571 if (sentinel.ai_next->ai_canonname ==
572 NULL) {
573 sentinel.ai_next->ai_canonname
574 = canonname;
575 } else if (canonname != NULL)
576 free(canonname);
577 }
578 }
579 *res = sentinel.ai_next;
580 return SUCCESS;
581 } else
582 error = EAI_FAIL;
583 }
584 free:
585 bad:
586 if (sentinel.ai_next)
587 freeaddrinfo(sentinel.ai_next);
588 *res = NULL;
589 return error;
590 }
591
592 static int
593 reorder(struct addrinfo *sentinel)
594 {
595 struct addrinfo *ai, **aip;
596 struct ai_order *aio;
597 int i, n;
598 struct policyhead policyhead;
599
600 /* count the number of addrinfo elements for sorting. */
601 for (n = 0, ai = sentinel->ai_next; ai != NULL; ai = ai->ai_next, n++)
602 ;
603
604 /*
605 * If the number is small enough, we can skip the reordering process.
606 */
607 if (n <= 1)
608 return(n);
609
610 /* allocate a temporary array for sort and initialization of it. */
611 if ((aio = malloc(sizeof(*aio) * n)) == NULL)
612 return(n); /* give up reordering */
613 memset(aio, 0, sizeof(*aio) * n);
614
615 /* retrieve address selection policy from the kernel */
616 TAILQ_INIT(&policyhead);
617 if (!get_addrselectpolicy(&policyhead)) {
618 /* no policy is installed into kernel, we don't sort. */
619 free(aio);
620 return (n);
621 }
622
623 for (i = 0, ai = sentinel->ai_next; i < n; ai = ai->ai_next, i++) {
624 aio[i].aio_ai = ai;
625 aio[i].aio_dstscope = gai_addr2scopetype(ai->ai_addr);
626 aio[i].aio_dstpolicy = match_addrselectpolicy(ai->ai_addr,
627 &policyhead);
628 set_source(&aio[i], &policyhead);
629 }
630
631 /* perform sorting. */
632 qsort(aio, n, sizeof(*aio), comp_dst);
633
634 /* reorder the addrinfo chain. */
635 for (i = 0, aip = &sentinel->ai_next; i < n; i++) {
636 *aip = aio[i].aio_ai;
637 aip = &aio[i].aio_ai->ai_next;
638 }
639 *aip = NULL;
640
641 /* cleanup and return */
642 free(aio);
643 free_addrselectpolicy(&policyhead);
644 return(n);
645 }
646
647 static int
648 get_addrselectpolicy(struct policyhead *head)
649 {
650 #ifdef INET6
651 int mib[] = { CTL_NET, PF_INET6, IPPROTO_IPV6, IPV6CTL_ADDRCTLPOLICY };
652 size_t l;
653 char *buf;
654 struct in6_addrpolicy *pol, *ep;
655
656 if (sysctl(mib, NELEM(mib), NULL, &l, NULL, 0) < 0)
657 return (0);
658 if ((buf = malloc(l)) == NULL)
659 return (0);
660 if (sysctl(mib, NELEM(mib), buf, &l, NULL, 0) < 0) {
661 free(buf);
662 return (0);
663 }
664
665 ep = (struct in6_addrpolicy *)(buf + l);
666 for (pol = (struct in6_addrpolicy *)buf; pol + 1 <= ep; pol++) {
667 struct policyqueue *new;
668
669 if ((new = malloc(sizeof(*new))) == NULL) {
670 free_addrselectpolicy(head); /* make the list empty */
671 break;
672 }
673 new->pc_policy = *pol;
674 TAILQ_INSERT_TAIL(head, new, pc_entry);
675 }
676
677 free(buf);
678 return (1);
679 #else
680 return (0);
681 #endif
682 }
683
684 static void
685 free_addrselectpolicy(struct policyhead *head)
686 {
687 struct policyqueue *ent, *nent;
688
689 for (ent = TAILQ_FIRST(head); ent; ent = nent) {
690 nent = TAILQ_NEXT(ent, pc_entry);
691 TAILQ_REMOVE(head, ent, pc_entry);
692 free(ent);
693 }
694 }
695
696 static struct policyqueue *
697 match_addrselectpolicy(struct sockaddr *addr, struct policyhead *head)
698 {
699 #ifdef INET6
700 struct policyqueue *ent, *bestent = NULL;
701 struct in6_addrpolicy *pol;
702 int matchlen, bestmatchlen = -1;
703 u_char *mp, *ep, *k, *p, m;
704 struct sockaddr_in6 key;
705
706 switch(addr->sa_family) {
707 case AF_INET6:
708 key = *(struct sockaddr_in6 *)addr;
709 break;
710 case AF_INET:
711 /* convert the address into IPv4-mapped IPv6 address. */
712 memset(&key, 0, sizeof(key));
713 key.sin6_family = AF_INET6;
714 key.sin6_len = sizeof(key);
715 key.sin6_addr.s6_addr[10] = 0xff;
716 key.sin6_addr.s6_addr[11] = 0xff;
717 memcpy(&key.sin6_addr.s6_addr[12],
718 &((struct sockaddr_in *)addr)->sin_addr, 4);
719 break;
720 default:
721 return(NULL);
722 }
723
724 for (ent = TAILQ_FIRST(head); ent; ent = TAILQ_NEXT(ent, pc_entry)) {
725 pol = &ent->pc_policy;
726 matchlen = 0;
727
728 mp = (u_char *)&pol->addrmask.sin6_addr;
729 ep = mp + 16; /* XXX: scope field? */
730 k = (u_char *)&key.sin6_addr;
731 p = (u_char *)&pol->addr.sin6_addr;
732 for (; mp < ep && *mp; mp++, k++, p++) {
733 m = *mp;
734 if ((*k & m) != *p)
735 goto next; /* not match */
736 if (m == 0xff) /* short cut for a typical case */
737 matchlen += 8;
738 else {
739 while (m >= 0x80) {
740 matchlen++;
741 m <<= 1;
742 }
743 }
744 }
745
746 /* matched. check if this is better than the current best. */
747 if (matchlen > bestmatchlen) {
748 bestent = ent;
749 bestmatchlen = matchlen;
750 }
751
752 next:
753 continue;
754 }
755
756 return(bestent);
757 #else
758 return(NULL);
759 #endif
760
761 }
762
763 static void
764 set_source(struct ai_order *aio, struct policyhead *ph)
765 {
766 struct addrinfo ai = *aio->aio_ai;
767 struct sockaddr_storage ss;
768 socklen_t srclen;
769 int s;
770
771 /* set unspec ("no source is available"), just in case */
772 aio->aio_srcsa.sa_family = AF_UNSPEC;
773 aio->aio_srcscope = -1;
774
775 switch(ai.ai_family) {
776 case AF_INET:
777 #ifdef INET6
778 case AF_INET6:
779 #endif
780 break;
781 default: /* ignore unsupported AFs explicitly */
782 return;
783 }
784
785 /* XXX: make a dummy addrinfo to call connect() */
786 ai.ai_socktype = SOCK_DGRAM;
787 ai.ai_protocol = IPPROTO_UDP; /* is UDP too specific? */
788 ai.ai_next = NULL;
789 memset(&ss, 0, sizeof(ss));
790 memcpy(&ss, ai.ai_addr, ai.ai_addrlen);
791 ai.ai_addr = (struct sockaddr *)&ss;
792 get_port(&ai, "1", 0);
793
794 /* open a socket to get the source address for the given dst */
795 if ((s = _socket(ai.ai_family, ai.ai_socktype, ai.ai_protocol)) < 0)
796 return; /* give up */
797 if (_connect(s, ai.ai_addr, ai.ai_addrlen) < 0)
798 goto cleanup;
799 srclen = ai.ai_addrlen;
800 if (_getsockname(s, &aio->aio_srcsa, &srclen) < 0) {
801 aio->aio_srcsa.sa_family = AF_UNSPEC;
802 goto cleanup;
803 }
804 aio->aio_srcscope = gai_addr2scopetype(&aio->aio_srcsa);
805 aio->aio_srcpolicy = match_addrselectpolicy(&aio->aio_srcsa, ph);
806 aio->aio_matchlen = matchlen(&aio->aio_srcsa, aio->aio_ai->ai_addr);
807 #ifdef INET6
808 if (ai.ai_family == AF_INET6) {
809 struct in6_ifreq ifr6;
810 u_int32_t flags6;
811
812 /* XXX: interface name should not be hardcoded */
813 strncpy(ifr6.ifr_name, "lo0", sizeof(ifr6.ifr_name));
814 memset(&ifr6, 0, sizeof(ifr6));
815 memcpy(&ifr6.ifr_addr, ai.ai_addr, ai.ai_addrlen);
816 if (_ioctl(s, SIOCGIFAFLAG_IN6, &ifr6) == 0) {
817 flags6 = ifr6.ifr_ifru.ifru_flags6;
818 if ((flags6 & IN6_IFF_DEPRECATED))
819 aio->aio_srcflag |= AIO_SRCFLAG_DEPRECATED;
820 }
821 }
822 #endif
823
824 cleanup:
825 _close(s);
826 return;
827 }
828
829 static int
830 matchlen(struct sockaddr *src, struct sockaddr *dst)
831 {
832 int match = 0;
833 u_char *s, *d;
834 u_char *lim, r;
835 int addrlen;
836
837 switch (src->sa_family) {
838 #ifdef INET6
839 case AF_INET6:
840 s = (u_char *)&((struct sockaddr_in6 *)src)->sin6_addr;
841 d = (u_char *)&((struct sockaddr_in6 *)dst)->sin6_addr;
842 addrlen = sizeof(struct in6_addr);
843 lim = s + addrlen;
844 break;
845 #endif
846 case AF_INET:
847 s = (u_char *)&((struct sockaddr_in *)src)->sin_addr;
848 d = (u_char *)&((struct sockaddr_in *)dst)->sin_addr;
849 addrlen = sizeof(struct in_addr);
850 lim = s + addrlen;
851 break;
852 default:
853 return(0);
854 }
855
856 while (s < lim)
857 if ((r = (*d++ ^ *s++)) != 0) {
858 while (r < addrlen * 8) {
859 match++;
860 r <<= 1;
861 }
862 break;
863 } else
864 match += 8;
865 return(match);
866 }
867
868 static int
869 comp_dst(const void *arg1, const void *arg2)
870 {
871 const struct ai_order *dst1 = arg1, *dst2 = arg2;
872
873 /*
874 * Rule 1: Avoid unusable destinations.
875 * XXX: we currently do not consider if an appropriate route exists.
876 */
877 if (dst1->aio_srcsa.sa_family != AF_UNSPEC &&
878 dst2->aio_srcsa.sa_family == AF_UNSPEC) {
879 return(-1);
880 }
881 if (dst1->aio_srcsa.sa_family == AF_UNSPEC &&
882 dst2->aio_srcsa.sa_family != AF_UNSPEC) {
883 return(1);
884 }
885
886 /* Rule 2: Prefer matching scope. */
887 if (dst1->aio_dstscope == dst1->aio_srcscope &&
888 dst2->aio_dstscope != dst2->aio_srcscope) {
889 return(-1);
890 }
891 if (dst1->aio_dstscope != dst1->aio_srcscope &&
892 dst2->aio_dstscope == dst2->aio_srcscope) {
893 return(1);
894 }
895
896 /* Rule 3: Avoid deprecated addresses. */
897 if (dst1->aio_srcsa.sa_family != AF_UNSPEC &&
898 dst2->aio_srcsa.sa_family != AF_UNSPEC) {
899 if (!(dst1->aio_srcflag & AIO_SRCFLAG_DEPRECATED) &&
900 (dst2->aio_srcflag & AIO_SRCFLAG_DEPRECATED)) {
901 return(-1);
902 }
903 if ((dst1->aio_srcflag & AIO_SRCFLAG_DEPRECATED) &&
904 !(dst2->aio_srcflag & AIO_SRCFLAG_DEPRECATED)) {
905 return(1);
906 }
907 }
908
909 /* Rule 4: Prefer home addresses. */
910 /* XXX: not implemented yet */
911
912 /* Rule 5: Prefer matching label. */
913 #ifdef INET6
914 if (dst1->aio_srcpolicy && dst1->aio_dstpolicy &&
915 dst1->aio_srcpolicy->pc_policy.label ==
916 dst1->aio_dstpolicy->pc_policy.label &&
917 (dst2->aio_srcpolicy == NULL || dst2->aio_dstpolicy == NULL ||
918 dst2->aio_srcpolicy->pc_policy.label !=
919 dst2->aio_dstpolicy->pc_policy.label)) {
920 return(-1);
921 }
922 if (dst2->aio_srcpolicy && dst2->aio_dstpolicy &&
923 dst2->aio_srcpolicy->pc_policy.label ==
924 dst2->aio_dstpolicy->pc_policy.label &&
925 (dst1->aio_srcpolicy == NULL || dst1->aio_dstpolicy == NULL ||
926 dst1->aio_srcpolicy->pc_policy.label !=
927 dst1->aio_dstpolicy->pc_policy.label)) {
928 return(1);
929 }
930 #endif
931
932 /* Rule 6: Prefer higher precedence. */
933 #ifdef INET6
934 if (dst1->aio_dstpolicy &&
935 (dst2->aio_dstpolicy == NULL ||
936 dst1->aio_dstpolicy->pc_policy.preced >
937 dst2->aio_dstpolicy->pc_policy.preced)) {
938 return(-1);
939 }
940 if (dst2->aio_dstpolicy &&
941 (dst1->aio_dstpolicy == NULL ||
942 dst2->aio_dstpolicy->pc_policy.preced >
943 dst1->aio_dstpolicy->pc_policy.preced)) {
944 return(1);
945 }
946 #endif
947
948 /* Rule 7: Prefer native transport. */
949 /* XXX: not implemented yet */
950
951 /* Rule 8: Prefer smaller scope. */
952 if (dst1->aio_dstscope >= 0 &&
953 dst1->aio_dstscope < dst2->aio_dstscope) {
954 return(-1);
955 }
956 if (dst2->aio_dstscope >= 0 &&
957 dst2->aio_dstscope < dst1->aio_dstscope) {
958 return(1);
959 }
960
961 /*
962 * Rule 9: Use longest matching prefix.
963 * We compare the match length in a same AF only.
964 */
965 if (dst1->aio_ai->ai_addr->sa_family ==
966 dst2->aio_ai->ai_addr->sa_family) {
967 if (dst1->aio_matchlen > dst2->aio_matchlen) {
968 return(-1);
969 }
970 if (dst1->aio_matchlen < dst2->aio_matchlen) {
971 return(1);
972 }
973 }
974
975 /* Rule 10: Otherwise, leave the order unchanged. */
976 return(-1);
977 }
978
979 /*
980 * Copy from scope.c.
981 * XXX: we should standardize the functions and link them as standard
982 * library.
983 */
984 static int
985 gai_addr2scopetype(struct sockaddr *sa)
986 {
987 #ifdef INET6
988 struct sockaddr_in6 *sa6;
989 #endif
990 struct sockaddr_in *sa4;
991
992 switch(sa->sa_family) {
993 #ifdef INET6
994 case AF_INET6:
995 sa6 = (struct sockaddr_in6 *)sa;
996 if (IN6_IS_ADDR_MULTICAST(&sa6->sin6_addr)) {
997 /* just use the scope field of the multicast address */
998 return(sa6->sin6_addr.s6_addr[2] & 0x0f);
999 }
1000 /*
1001 * Unicast addresses: map scope type to corresponding scope
1002 * value defined for multcast addresses.
1003 * XXX: hardcoded scope type values are bad...
1004 */
1005 if (IN6_IS_ADDR_LOOPBACK(&sa6->sin6_addr))
1006 return(1); /* node local scope */
1007 if (IN6_IS_ADDR_LINKLOCAL(&sa6->sin6_addr))
1008 return(2); /* link-local scope */
1009 if (IN6_IS_ADDR_SITELOCAL(&sa6->sin6_addr))
1010 return(5); /* site-local scope */
1011 return(14); /* global scope */
1012 break;
1013 #endif
1014 case AF_INET:
1015 /*
1016 * IPv4 pseudo scoping according to RFC 3484.
1017 */
1018 sa4 = (struct sockaddr_in *)sa;
1019 /* IPv4 autoconfiguration addresses have link-local scope. */
1020 if (((u_char *)&sa4->sin_addr)[0] == 169 &&
1021 ((u_char *)&sa4->sin_addr)[1] == 254)
1022 return(2);
1023 /* Private addresses have site-local scope. */
1024 if (((u_char *)&sa4->sin_addr)[0] == 10 ||
1025 (((u_char *)&sa4->sin_addr)[0] == 172 &&
1026 (((u_char *)&sa4->sin_addr)[1] & 0xf0) == 16) ||
1027 (((u_char *)&sa4->sin_addr)[0] == 192 &&
1028 ((u_char *)&sa4->sin_addr)[1] == 168))
1029 return(14); /* XXX: It should be 5 unless NAT */
1030 /* Loopback addresses have link-local scope. */
1031 if (((u_char *)&sa4->sin_addr)[0] == 127)
1032 return(2);
1033 return(14);
1034 break;
1035 default:
1036 errno = EAFNOSUPPORT; /* is this a good error? */
1037 return(-1);
1038 }
1039 }
1040
1041 /*
1042 * hostname == NULL.
1043 * passive socket -> anyaddr (0.0.0.0 or ::)
1044 * non-passive socket -> localhost (127.0.0.1 or ::1)
1045 */
1046 static int
1047 explore_null(const struct addrinfo *pai, const char *servname,
1048 struct addrinfo **res)
1049 {
1050 int s;
1051 const struct afd *afd;
1052 struct addrinfo *ai;
1053 int error;
1054
1055 *res = NULL;
1056 ai = NULL;
1057
1058 /*
1059 * filter out AFs that are not supported by the kernel
1060 * XXX errno?
1061 */
1062 s = _socket(pai->ai_family, SOCK_DGRAM, 0);
1063 if (s < 0) {
1064 if (errno != EMFILE)
1065 return 0;
1066 } else
1067 _close(s);
1068
1069 /*
1070 * if the servname does not match socktype/protocol, ignore it.
1071 */
1072 if (get_portmatch(pai, servname) != 0)
1073 return 0;
1074
1075 afd = find_afd(pai->ai_family);
1076 if (afd == NULL)
1077 return 0;
1078
1079 if (pai->ai_flags & AI_PASSIVE) {
1080 GET_AI(ai, afd, afd->a_addrany);
1081 GET_PORT(ai, servname);
1082 } else {
1083 GET_AI(ai, afd, afd->a_loopback);
1084 GET_PORT(ai, servname);
1085 }
1086
1087 *res = ai;
1088 return 0;
1089
1090 free:
1091 if (ai != NULL)
1092 freeaddrinfo(ai);
1093 return error;
1094 }
1095
1096 /*
1097 * numeric hostname
1098 */
1099 static int
1100 explore_numeric(const struct addrinfo *pai, const char *hostname,
1101 const char *servname, struct addrinfo **res,
1102 const char *canonname)
1103 {
1104 const struct afd *afd;
1105 struct addrinfo *ai;
1106 int error;
1107 char pton[PTON_MAX];
1108
1109 *res = NULL;
1110 ai = NULL;
1111
1112 /*
1113 * if the servname does not match socktype/protocol, ignore it.
1114 */
1115 if (get_portmatch(pai, servname) != 0)
1116 return 0;
1117
1118 afd = find_afd(pai->ai_family);
1119 if (afd == NULL)
1120 return 0;
1121
1122 switch (afd->a_af) {
1123 case AF_INET:
1124 /*
1125 * RFC3493 requires getaddrinfo() to accept AF_INET formats
1126 * that are accepted by inet_addr() and its family. The
1127 * accepted forms includes the "classful" one, which inet_pton
1128 * does not accept. So we need to separate the case for
1129 * AF_INET.
1130 */
1131 if (inet_aton(hostname, (struct in_addr *)pton) != 1)
1132 return 0;
1133 break;
1134 default:
1135 if (inet_pton(afd->a_af, hostname, pton) != 1)
1136 return 0;
1137 break;
1138 }
1139
1140 if (pai->ai_family == afd->a_af) {
1141 GET_AI(ai, afd, pton);
1142 GET_PORT(ai, servname);
1143 if ((pai->ai_flags & AI_CANONNAME)) {
1144 /*
1145 * Set the numeric address itself as the canonical
1146 * name, based on a clarification in RFC3493.
1147 */
1148 GET_CANONNAME(ai, canonname);
1149 }
1150 } else {
1151 /*
1152 * XXX: This should not happen since we already matched the AF
1153 * by find_afd.
1154 */
1155 ERR(EAI_FAMILY);
1156 }
1157
1158 *res = ai;
1159 return 0;
1160
1161 free:
1162 bad:
1163 if (ai != NULL)
1164 freeaddrinfo(ai);
1165 return error;
1166 }
1167
1168 /*
1169 * numeric hostname with scope
1170 */
1171 static int
1172 explore_numeric_scope(const struct addrinfo *pai, const char *hostname,
1173 const char *servname, struct addrinfo **res)
1174 {
1175 #if !defined(SCOPE_DELIMITER) || !defined(INET6)
1176 return explore_numeric(pai, hostname, servname, res, hostname);
1177 #else
1178 const struct afd *afd;
1179 struct addrinfo *cur;
1180 int error;
1181 char *cp, *hostname2 = NULL, *scope, *addr;
1182 struct sockaddr_in6 *sin6;
1183
1184 /*
1185 * if the servname does not match socktype/protocol, ignore it.
1186 */
1187 if (get_portmatch(pai, servname) != 0)
1188 return 0;
1189
1190 afd = find_afd(pai->ai_family);
1191 if (afd == NULL)
1192 return 0;
1193
1194 if (!afd->a_scoped)
1195 return explore_numeric(pai, hostname, servname, res, hostname);
1196
1197 cp = strchr(hostname, SCOPE_DELIMITER);
1198 if (cp == NULL)
1199 return explore_numeric(pai, hostname, servname, res, hostname);
1200
1201 /*
1202 * Handle special case of <scoped_address><delimiter><scope id>
1203 */
1204 hostname2 = strdup(hostname);
1205 if (hostname2 == NULL)
1206 return EAI_MEMORY;
1207 /* terminate at the delimiter */
1208 hostname2[cp - hostname] = '\0';
1209 addr = hostname2;
1210 scope = cp + 1;
1211
1212 error = explore_numeric(pai, addr, servname, res, hostname);
1213 if (error == 0) {
1214 u_int32_t scopeid;
1215
1216 for (cur = *res; cur; cur = cur->ai_next) {
1217 if (cur->ai_family != AF_INET6)
1218 continue;
1219 sin6 = (struct sockaddr_in6 *)(void *)cur->ai_addr;
1220 if (ip6_str2scopeid(scope, sin6, &scopeid) == -1) {
1221 free(hostname2);
1222 return(EAI_NONAME); /* XXX: is return OK? */
1223 }
1224 sin6->sin6_scope_id = scopeid;
1225 }
1226 }
1227
1228 free(hostname2);
1229
1230 return error;
1231 #endif
1232 }
1233
1234 static int
1235 get_canonname(const struct addrinfo *pai, struct addrinfo *ai, const char *str)
1236 {
1237 if ((pai->ai_flags & AI_CANONNAME) != 0) {
1238 ai->ai_canonname = strdup(str);
1239 if (ai->ai_canonname == NULL)
1240 return EAI_MEMORY;
1241 }
1242 return 0;
1243 }
1244
1245 static struct addrinfo *
1246 get_ai(const struct addrinfo *pai, const struct afd *afd, const char *addr)
1247 {
1248 char *p;
1249 struct addrinfo *ai;
1250 #ifdef FAITH
1251 struct in6_addr faith_prefix;
1252 char *fp_str;
1253 int translate = 0;
1254 #endif
1255
1256 #ifdef FAITH
1257 /*
1258 * Transfrom an IPv4 addr into a special IPv6 addr format for
1259 * IPv6->IPv4 translation gateway. (only TCP is supported now)
1260 *
1261 * +-----------------------------------+------------+
1262 * | faith prefix part (12 bytes) | embedded |
1263 * | | IPv4 addr part (4 bytes)
1264 * +-----------------------------------+------------+
1265 *
1266 * faith prefix part is specified as ascii IPv6 addr format
1267 * in environmental variable GAI.
1268 * For FAITH to work correctly, routing to faith prefix must be
1269 * setup toward a machine where a FAITH daemon operates.
1270 * Also, the machine must enable some mechanizm
1271 * (e.g. faith interface hack) to divert those packet with
1272 * faith prefixed destination addr to user-land FAITH daemon.
1273 */
1274 fp_str = getenv("GAI");
1275 if (fp_str && inet_pton(AF_INET6, fp_str, &faith_prefix) == 1 &&
1276 afd->a_af == AF_INET && pai->ai_socktype == SOCK_STREAM) {
1277 u_int32_t v4a;
1278 u_int8_t v4a_top;
1279
1280 memcpy(&v4a, addr, sizeof v4a);
1281 v4a_top = v4a >> IN_CLASSA_NSHIFT;
1282 if (!IN_MULTICAST(v4a) && !IN_EXPERIMENTAL(v4a) &&
1283 v4a_top != 0 && v4a != IN_LOOPBACKNET) {
1284 afd = &afdl[N_INET6];
1285 memcpy(&faith_prefix.s6_addr[12], addr,
1286 sizeof(struct in_addr));
1287 translate = 1;
1288 }
1289 }
1290 #endif
1291
1292 ai = (struct addrinfo *)malloc(sizeof(struct addrinfo)
1293 + (afd->a_socklen));
1294 if (ai == NULL)
1295 return NULL;
1296
1297 memcpy(ai, pai, sizeof(struct addrinfo));
1298 ai->ai_addr = (struct sockaddr *)(void *)(ai + 1);
1299 memset(ai->ai_addr, 0, (size_t)afd->a_socklen);
1300 ai->ai_addr->sa_len = afd->a_socklen;
1301 ai->ai_addrlen = afd->a_socklen;
1302 ai->ai_addr->sa_family = ai->ai_family = afd->a_af;
1303 p = (char *)(void *)(ai->ai_addr);
1304 #ifdef FAITH
1305 if (translate == 1)
1306 memcpy(p + afd->a_off, &faith_prefix, (size_t)afd->a_addrlen);
1307 else
1308 #endif
1309 memcpy(p + afd->a_off, addr, (size_t)afd->a_addrlen);
1310 return ai;
1311 }
1312
1313 static int
1314 get_portmatch(const struct addrinfo *ai, const char *servname)
1315 {
1316
1317 /* get_port does not touch first argument when matchonly == 1. */
1318 /* LINTED const cast */
1319 return get_port((struct addrinfo *)ai, servname, 1);
1320 }
1321
1322 static int
1323 get_port(struct addrinfo *ai, const char *servname, int matchonly)
1324 {
1325 const char *proto;
1326 struct servent *sp;
1327 int port, error;
1328 int allownumeric;
1329
1330 if (servname == NULL)
1331 return 0;
1332 switch (ai->ai_family) {
1333 case AF_INET:
1334 #ifdef AF_INET6
1335 case AF_INET6:
1336 #endif
1337 break;
1338 default:
1339 return 0;
1340 }
1341
1342 switch (ai->ai_socktype) {
1343 case SOCK_RAW:
1344 return EAI_SERVICE;
1345 case SOCK_DGRAM:
1346 case SOCK_STREAM:
1347 allownumeric = 1;
1348 break;
1349 case ANY:
1350 allownumeric = 0;
1351 break;
1352 default:
1353 return EAI_SOCKTYPE;
1354 }
1355
1356 error = str2number(servname, &port);
1357 if (error == 0) {
1358 if (!allownumeric)
1359 return EAI_SERVICE;
1360 if (port < 0 || port > 65535)
1361 return EAI_SERVICE;
1362 port = htons(port);
1363 } else {
1364 if (ai->ai_flags & AI_NUMERICSERV)
1365 return EAI_NONAME;
1366 switch (ai->ai_socktype) {
1367 case SOCK_DGRAM:
1368 proto = "udp";
1369 break;
1370 case SOCK_STREAM:
1371 proto = "tcp";
1372 break;
1373 default:
1374 proto = NULL;
1375 break;
1376 }
1377
1378 if ((sp = getservbyname(servname, proto)) == NULL)
1379 return EAI_SERVICE;
1380 port = sp->s_port;
1381 }
1382
1383 if (!matchonly) {
1384 switch (ai->ai_family) {
1385 case AF_INET:
1386 ((struct sockaddr_in *)(void *)
1387 ai->ai_addr)->sin_port = port;
1388 break;
1389 #ifdef INET6
1390 case AF_INET6:
1391 ((struct sockaddr_in6 *)(void *)
1392 ai->ai_addr)->sin6_port = port;
1393 break;
1394 #endif
1395 }
1396 }
1397
1398 return 0;
1399 }
1400
1401 static const struct afd *
1402 find_afd(int af)
1403 {
1404 const struct afd *afd;
1405
1406 if (af == PF_UNSPEC)
1407 return NULL;
1408 for (afd = afdl; afd->a_af; afd++) {
1409 if (afd->a_af == af)
1410 return afd;
1411 }
1412 return NULL;
1413 }
1414
1415 /*
1416 * post-2553: AI_ADDRCONFIG check. if we use getipnodeby* as backend, backend
1417 * will take care of it.
1418 * the semantics of AI_ADDRCONFIG is not defined well. we are not sure
1419 * if the code is right or not.
1420 *
1421 * XXX PF_UNSPEC -> PF_INET6 + PF_INET mapping needs to be in sync with
1422 * _dns_getaddrinfo.
1423 */
1424 static int
1425 addrconfig(struct addrinfo *pai)
1426 {
1427 int s, af;
1428
1429 /*
1430 * TODO:
1431 * Note that implementation dependent test for address
1432 * configuration should be done everytime called
1433 * (or apropriate interval),
1434 * because addresses will be dynamically assigned or deleted.
1435 */
1436 af = pai->ai_family;
1437 if (af == AF_UNSPEC) {
1438 if ((s = _socket(AF_INET6, SOCK_DGRAM, 0)) < 0)
1439 af = AF_INET;
1440 else {
1441 _close(s);
1442 if ((s = _socket(AF_INET, SOCK_DGRAM, 0)) < 0)
1443 af = AF_INET6;
1444 else
1445 _close(s);
1446 }
1447 }
1448 if (af != AF_UNSPEC) {
1449 if ((s = _socket(af, SOCK_DGRAM, 0)) < 0)
1450 return 0;
1451 _close(s);
1452 }
1453 pai->ai_family = af;
1454 return 1;
1455 }
1456
1457 #ifdef INET6
1458 /* convert a string to a scope identifier. XXX: IPv6 specific */
1459 static int
1460 ip6_str2scopeid(char *scope, struct sockaddr_in6 *sin6, u_int32_t *scopeid)
1461 {
1462 u_long lscopeid;
1463 struct in6_addr *a6;
1464 char *ep;
1465
1466 a6 = &sin6->sin6_addr;
1467
1468 /* empty scopeid portion is invalid */
1469 if (*scope == '\0')
1470 return -1;
1471
1472 if (IN6_IS_ADDR_LINKLOCAL(a6) || IN6_IS_ADDR_MC_LINKLOCAL(a6)) {
1473 /*
1474 * We currently assume a one-to-one mapping between links
1475 * and interfaces, so we simply use interface indices for
1476 * like-local scopes.
1477 */
1478 *scopeid = if_nametoindex(scope);
1479 if (*scopeid == 0)
1480 goto trynumeric;
1481 return 0;
1482 }
1483
1484 /* still unclear about literal, allow numeric only - placeholder */
1485 if (IN6_IS_ADDR_SITELOCAL(a6) || IN6_IS_ADDR_MC_SITELOCAL(a6))
1486 goto trynumeric;
1487 if (IN6_IS_ADDR_MC_ORGLOCAL(a6))
1488 goto trynumeric;
1489 else
1490 goto trynumeric; /* global */
1491
1492 /* try to convert to a numeric id as a last resort */
1493 trynumeric:
1494 errno = 0;
1495 lscopeid = strtoul(scope, &ep, 10);
1496 *scopeid = (u_int32_t)(lscopeid & 0xffffffffUL);
1497 if (errno == 0 && ep && *ep == '\0' && *scopeid == lscopeid)
1498 return 0;
1499 else
1500 return -1;
1501 }
1502 #endif
1503
1504
1505 #ifdef NS_CACHING
1506 static int
1507 addrinfo_id_func(char *buffer, size_t *buffer_size, va_list ap,
1508 void *cache_mdata __unused)
1509 {
1510 res_state statp;
1511 u_long res_options;
1512
1513 const int op_id = 0; /* identifies the getaddrinfo for the cache */
1514 char *hostname;
1515 struct addrinfo *hints;
1516
1517 char *p;
1518 int ai_flags, ai_family, ai_socktype, ai_protocol;
1519 size_t desired_size, size;
1520
1521 statp = __res_state();
1522 res_options = statp->options & (RES_RECURSE | RES_DEFNAMES |
1523 RES_DNSRCH | RES_NOALIASES | RES_USE_INET6);
1524
1525 hostname = va_arg(ap, char *);
1526 hints = va_arg(ap, struct addrinfo *);
1527
1528 desired_size = sizeof(res_options) + sizeof(int) + sizeof(int) * 4;
1529 if (hostname != NULL) {
1530 size = strlen(hostname);
1531 desired_size += size + 1;
1532 } else
1533 size = 0;
1534
1535 if (desired_size > *buffer_size) {
1536 *buffer_size = desired_size;
1537 return (NS_RETURN);
1538 }
1539
1540 if (hints == NULL)
1541 ai_flags = ai_family = ai_socktype = ai_protocol = 0;
1542 else {
1543 ai_flags = hints->ai_flags;
1544 ai_family = hints->ai_family;
1545 ai_socktype = hints->ai_socktype;
1546 ai_protocol = hints->ai_protocol;
1547 }
1548
1549 p = buffer;
1550 memcpy(p, &res_options, sizeof(res_options));
1551 p += sizeof(res_options);
1552
1553 memcpy(p, &op_id, sizeof(int));
1554 p += sizeof(int);
1555
1556 memcpy(p, &ai_flags, sizeof(int));
1557 p += sizeof(int);
1558
1559 memcpy(p, &ai_family, sizeof(int));
1560 p += sizeof(int);
1561
1562 memcpy(p, &ai_socktype, sizeof(int));
1563 p += sizeof(int);
1564
1565 memcpy(p, &ai_protocol, sizeof(int));
1566 p += sizeof(int);
1567
1568 if (hostname != NULL)
1569 memcpy(p, hostname, size);
1570
1571 *buffer_size = desired_size;
1572 return (NS_SUCCESS);
1573 }
1574
1575 static int
1576 addrinfo_marshal_func(char *buffer, size_t *buffer_size, void *retval,
1577 va_list ap __unused, void *cache_mdata __unused)
1578 {
1579 struct addrinfo *ai, *cai;
1580 char *p;
1581 size_t desired_size, size, ai_size;
1582
1583 ai = *((struct addrinfo **)retval);
1584
1585 desired_size = sizeof(size_t);
1586 ai_size = 0;
1587 for (cai = ai; cai != NULL; cai = cai->ai_next) {
1588 desired_size += sizeof(struct addrinfo) + cai->ai_addrlen;
1589 if (cai->ai_canonname != NULL)
1590 desired_size += sizeof(size_t) +
1591 strlen(cai->ai_canonname);
1592 ++ai_size;
1593 }
1594
1595 if (desired_size > *buffer_size) {
1596 /* this assignment is here for future use */
1597 errno = ERANGE;
1598 *buffer_size = desired_size;
1599 return (NS_RETURN);
1600 }
1601
1602 memset(buffer, 0, desired_size);
1603 p = buffer;
1604
1605 memcpy(p, &ai_size, sizeof(size_t));
1606 p += sizeof(size_t);
1607 for (cai = ai; cai != NULL; cai = cai->ai_next) {
1608 memcpy(p, cai, sizeof(struct addrinfo));
1609 p += sizeof(struct addrinfo);
1610
1611 memcpy(p, cai->ai_addr, cai->ai_addrlen);
1612 p += cai->ai_addrlen;
1613
1614 if (cai->ai_canonname != NULL) {
1615 size = strlen(cai->ai_canonname);
1616 memcpy(p, &size, sizeof(size_t));
1617 p += sizeof(size_t);
1618
1619 memcpy(p, cai->ai_canonname, size);
1620 p += size;
1621 }
1622 }
1623
1624 return (NS_SUCCESS);
1625 }
1626
1627 static int
1628 addrinfo_unmarshal_func(char *buffer, size_t buffer_size __unused, void *retval,
1629 va_list ap __unused, void *cache_mdata __unused)
1630 {
1631 struct addrinfo new_ai, *result, *sentinel, *lasts;
1632
1633 char *p;
1634 size_t ai_size, ai_i, size;
1635
1636 p = buffer;
1637 memcpy(&ai_size, p, sizeof(size_t));
1638 p += sizeof(size_t);
1639
1640 result = NULL;
1641 lasts = NULL;
1642 for (ai_i = 0; ai_i < ai_size; ++ai_i) {
1643 memcpy(&new_ai, p, sizeof(struct addrinfo));
1644 p += sizeof(struct addrinfo);
1645 size = new_ai.ai_addrlen + sizeof(struct addrinfo) +
1646 _ALIGNBYTES;
1647
1648 sentinel = (struct addrinfo *)malloc(size);
1649 memset(sentinel, 0, size);
1650
1651 memcpy(sentinel, &new_ai, sizeof(struct addrinfo));
1652 sentinel->ai_addr = (struct sockaddr *)_ALIGN((char *)sentinel +
1653 sizeof(struct addrinfo));
1654
1655 memcpy(sentinel->ai_addr, p, new_ai.ai_addrlen);
1656 p += new_ai.ai_addrlen;
1657
1658 if (new_ai.ai_canonname != NULL) {
1659 memcpy(&size, p, sizeof(size_t));
1660 p += sizeof(size_t);
1661
1662 sentinel->ai_canonname = (char *)malloc(size + 1);
1663 memset(sentinel->ai_canonname, 0, size + 1);
1664
1665 memcpy(sentinel->ai_canonname, p, size);
1666 p += size;
1667 }
1668
1669 if (result == NULL) {
1670 result = sentinel;
1671 lasts = sentinel;
1672 } else {
1673 lasts->ai_next = sentinel;
1674 lasts = sentinel;
1675 }
1676 }
1677
1678 *((struct addrinfo **)retval) = result;
1679 return (NS_SUCCESS);
1680 }
1681 #endif /* NS_CACHING */
1682
1683 /*
1684 * FQDN hostname, DNS lookup
1685 */
1686 static int
1687 explore_fqdn(const struct addrinfo *pai, const char *hostname,
1688 const char *servname, struct addrinfo **res)
1689 {
1690 struct addrinfo *result;
1691 struct addrinfo *cur;
1692 int error = 0;
1693
1694 #ifdef NS_CACHING
1695 static const nss_cache_info cache_info =
1696 NS_COMMON_CACHE_INFO_INITIALIZER(
1697 hosts, NULL, addrinfo_id_func, addrinfo_marshal_func,
1698 addrinfo_unmarshal_func);
1699 #endif
1700 static const ns_dtab dtab[] = {
1701 NS_FILES_CB(_files_getaddrinfo, NULL)
1702 { NSSRC_DNS, _dns_getaddrinfo, NULL }, /* force -DHESIOD */
1703 NS_NIS_CB(_yp_getaddrinfo, NULL)
1704 #ifdef NS_CACHING
1705 NS_CACHE_CB(&cache_info)
1706 #endif
1707 { 0 }
1708 };
1709
1710 result = NULL;
1711
1712 /*
1713 * if the servname does not match socktype/protocol, ignore it.
1714 */
1715 if (get_portmatch(pai, servname) != 0)
1716 return 0;
1717
1718 switch (_nsdispatch(&result, dtab, NSDB_HOSTS, "getaddrinfo",
1719 default_dns_files, hostname, pai)) {
1720 case NS_TRYAGAIN:
1721 error = EAI_AGAIN;
1722 goto free;
1723 case NS_UNAVAIL:
1724 error = EAI_FAIL;
1725 goto free;
1726 case NS_NOTFOUND:
1727 error = EAI_NONAME;
1728 goto free;
1729 case NS_SUCCESS:
1730 error = 0;
1731 for (cur = result; cur; cur = cur->ai_next) {
1732 GET_PORT(cur, servname);
1733 /* canonname should be filled already */
1734 }
1735 break;
1736 }
1737
1738 *res = result;
1739
1740 return 0;
1741
1742 free:
1743 if (result)
1744 freeaddrinfo(result);
1745 return error;
1746 }
1747
1748 #ifdef DEBUG
1749 static const char AskedForGot[] =
1750 "gethostby*.getanswer: asked for \"%s\", got \"%s\"";
1751 #endif
1752
1753 static struct addrinfo *
1754 getanswer(const querybuf *answer, int anslen, const char *qname, int qtype,
1755 const struct addrinfo *pai, res_state res)
1756 {
1757 struct addrinfo sentinel, *cur;
1758 struct addrinfo ai;
1759 const struct afd *afd;
1760 char *canonname;
1761 const HEADER *hp;
1762 const u_char *cp;
1763 int n;
1764 const u_char *eom;
1765 char *bp, *ep;
1766 int type, class, ancount, qdcount;
1767 int haveanswer, had_error;
1768 char tbuf[MAXDNAME];
1769 int (*name_ok)(const char *);
1770 char hostbuf[8*1024];
1771
1772 memset(&sentinel, 0, sizeof(sentinel));
1773 cur = &sentinel;
1774
1775 canonname = NULL;
1776 eom = answer->buf + anslen;
1777 switch (qtype) {
1778 case T_A:
1779 case T_AAAA:
1780 case T_ANY: /*use T_ANY only for T_A/T_AAAA lookup*/
1781 name_ok = res_hnok;
1782 break;
1783 default:
1784 return (NULL); /* XXX should be abort(); */
1785 }
1786 /*
1787 * find first satisfactory answer
1788 */
1789 hp = &answer->hdr;
1790 ancount = ntohs(hp->ancount);
1791 qdcount = ntohs(hp->qdcount);
1792 bp = hostbuf;
1793 ep = hostbuf + sizeof hostbuf;
1794 cp = answer->buf + HFIXEDSZ;
1795 if (qdcount != 1) {
1796 RES_SET_H_ERRNO(res, NO_RECOVERY);
1797 return (NULL);
1798 }
1799 n = dn_expand(answer->buf, eom, cp, bp, ep - bp);
1800 if ((n < 0) || !(*name_ok)(bp)) {
1801 RES_SET_H_ERRNO(res, NO_RECOVERY);
1802 return (NULL);
1803 }
1804 cp += n + QFIXEDSZ;
1805 if (qtype == T_A || qtype == T_AAAA || qtype == T_ANY) {
1806 /* res_send() has already verified that the query name is the
1807 * same as the one we sent; this just gets the expanded name
1808 * (i.e., with the succeeding search-domain tacked on).
1809 */
1810 n = strlen(bp) + 1; /* for the \0 */
1811 if (n >= MAXHOSTNAMELEN) {
1812 RES_SET_H_ERRNO(res, NO_RECOVERY);
1813 return (NULL);
1814 }
1815 canonname = bp;
1816 bp += n;
1817 /* The qname can be abbreviated, but h_name is now absolute. */
1818 qname = canonname;
1819 }
1820 haveanswer = 0;
1821 had_error = 0;
1822 while (ancount-- > 0 && cp < eom && !had_error) {
1823 n = dn_expand(answer->buf, eom, cp, bp, ep - bp);
1824 if ((n < 0) || !(*name_ok)(bp)) {
1825 had_error++;
1826 continue;
1827 }
1828 cp += n; /* name */
1829 type = _getshort(cp);
1830 cp += INT16SZ; /* type */
1831 class = _getshort(cp);
1832 cp += INT16SZ + INT32SZ; /* class, TTL */
1833 n = _getshort(cp);
1834 cp += INT16SZ; /* len */
1835 if (class != C_IN) {
1836 /* XXX - debug? syslog? */
1837 cp += n;
1838 continue; /* XXX - had_error++ ? */
1839 }
1840 if ((qtype == T_A || qtype == T_AAAA || qtype == T_ANY) &&
1841 type == T_CNAME) {
1842 n = dn_expand(answer->buf, eom, cp, tbuf, sizeof tbuf);
1843 if ((n < 0) || !(*name_ok)(tbuf)) {
1844 had_error++;
1845 continue;
1846 }
1847 cp += n;
1848 /* Get canonical name. */
1849 n = strlen(tbuf) + 1; /* for the \0 */
1850 if (n > ep - bp || n >= MAXHOSTNAMELEN) {
1851 had_error++;
1852 continue;
1853 }
1854 strlcpy(bp, tbuf, ep - bp);
1855 canonname = bp;
1856 bp += n;
1857 continue;
1858 }
1859 if (qtype == T_ANY) {
1860 if (!(type == T_A || type == T_AAAA)) {
1861 cp += n;
1862 continue;
1863 }
1864 } else if (type != qtype) {
1865 #ifdef DEBUG
1866 if (type != T_KEY && type != T_SIG)
1867 syslog(LOG_NOTICE|LOG_AUTH,
1868 "gethostby*.getanswer: asked for \"%s %s %s\", got type \"%s\"",
1869 qname, p_class(C_IN), p_type(qtype),
1870 p_type(type));
1871 #endif
1872 cp += n;
1873 continue; /* XXX - had_error++ ? */
1874 }
1875 switch (type) {
1876 case T_A:
1877 case T_AAAA:
1878 if (strcasecmp(canonname, bp) != 0) {
1879 #ifdef DEBUG
1880 syslog(LOG_NOTICE|LOG_AUTH,
1881 AskedForGot, canonname, bp);
1882 #endif
1883 cp += n;
1884 continue; /* XXX - had_error++ ? */
1885 }
1886 if (type == T_A && n != INADDRSZ) {
1887 cp += n;
1888 continue;
1889 }
1890 if (type == T_AAAA && n != IN6ADDRSZ) {
1891 cp += n;
1892 continue;
1893 }
1894 #ifdef FILTER_V4MAPPED
1895 if (type == T_AAAA) {
1896 struct in6_addr in6;
1897 memcpy(&in6, cp, sizeof(in6));
1898 if (IN6_IS_ADDR_V4MAPPED(&in6)) {
1899 cp += n;
1900 continue;
1901 }
1902 }
1903 #endif
1904 if (!haveanswer) {
1905 int nn;
1906
1907 canonname = bp;
1908 nn = strlen(bp) + 1; /* for the \0 */
1909 bp += nn;
1910 }
1911
1912 /* don't overwrite pai */
1913 ai = *pai;
1914 ai.ai_family = (type == T_A) ? AF_INET : AF_INET6;
1915 afd = find_afd(ai.ai_family);
1916 if (afd == NULL) {
1917 cp += n;
1918 continue;
1919 }
1920 cur->ai_next = get_ai(&ai, afd, (const char *)cp);
1921 if (cur->ai_next == NULL)
1922 had_error++;
1923 while (cur && cur->ai_next)
1924 cur = cur->ai_next;
1925 cp += n;
1926 break;
1927 default:
1928 abort();
1929 }
1930 if (!had_error)
1931 haveanswer++;
1932 }
1933 if (haveanswer) {
1934 #if defined(RESOLVSORT)
1935 /*
1936 * We support only IPv4 address for backward
1937 * compatibility against gethostbyname(3).
1938 */
1939 if (res->nsort && qtype == T_A) {
1940 if (addr4sort(&sentinel, res) < 0) {
1941 freeaddrinfo(sentinel.ai_next);
1942 RES_SET_H_ERRNO(res, NO_RECOVERY);
1943 return NULL;
1944 }
1945 }
1946 #endif /*RESOLVSORT*/
1947 if (!canonname)
1948 get_canonname(pai, sentinel.ai_next, qname);
1949 else
1950 get_canonname(pai, sentinel.ai_next, canonname);
1951 RES_SET_H_ERRNO(res, NETDB_SUCCESS);
1952 return sentinel.ai_next;
1953 }
1954
1955 RES_SET_H_ERRNO(res, NO_RECOVERY);
1956 return NULL;
1957 }
1958
1959 #ifdef RESOLVSORT
1960 struct addr_ptr {
1961 struct addrinfo *ai;
1962 int aval;
1963 };
1964
1965 static int
1966 addr4sort(struct addrinfo *sentinel, res_state res)
1967 {
1968 struct addrinfo *ai;
1969 struct addr_ptr *addrs, addr;
1970 struct sockaddr_in *sin;
1971 int naddrs, i, j;
1972 int needsort = 0;
1973
1974 if (!sentinel)
1975 return -1;
1976 naddrs = 0;
1977 for (ai = sentinel->ai_next; ai; ai = ai->ai_next)
1978 naddrs++;
1979 if (naddrs < 2)
1980 return 0; /* We don't need sorting. */
1981 if ((addrs = malloc(sizeof(struct addr_ptr) * naddrs)) == NULL)
1982 return -1;
1983 i = 0;
1984 for (ai = sentinel->ai_next; ai; ai = ai->ai_next) {
1985 sin = (struct sockaddr_in *)ai->ai_addr;
1986 for (j = 0; (unsigned)j < res->nsort; j++) {
1987 if (res->sort_list[j].addr.s_addr ==
1988 (sin->sin_addr.s_addr & res->sort_list[j].mask))
1989 break;
1990 }
1991 addrs[i].ai = ai;
1992 addrs[i].aval = j;
1993 if (needsort == 0 && i > 0 && j < addrs[i - 1].aval)
1994 needsort = i;
1995 i++;
1996 }
1997 if (!needsort) {
1998 free(addrs);
1999 return 0;
2000 }
2001
2002 while (needsort < naddrs) {
2003 for (j = needsort - 1; j >= 0; j--) {
2004 if (addrs[j].aval > addrs[j+1].aval) {
2005 addr = addrs[j];
2006 addrs[j] = addrs[j + 1];
2007 addrs[j + 1] = addr;
2008 } else
2009 break;
2010 }
2011 needsort++;
2012 }
2013
2014 ai = sentinel;
2015 for (i = 0; i < naddrs; ++i) {
2016 ai->ai_next = addrs[i].ai;
2017 ai = ai->ai_next;
2018 }
2019 ai->ai_next = NULL;
2020 free(addrs);
2021 return 0;
2022 }
2023 #endif /*RESOLVSORT*/
2024
2025 /*ARGSUSED*/
2026 static int
2027 _dns_getaddrinfo(void *rv, void *cb_data __unused, va_list ap)
2028 {
2029 struct addrinfo *ai;
2030 querybuf *buf, *buf2;
2031 const char *hostname;
2032 const struct addrinfo *pai;
2033 struct addrinfo sentinel, *cur;
2034 struct res_target q, q2;
2035 res_state res;
2036
2037 hostname = va_arg(ap, char *);
2038 pai = va_arg(ap, const struct addrinfo *);
2039
2040 memset(&q, 0, sizeof(q));
2041 memset(&q2, 0, sizeof(q2));
2042 memset(&sentinel, 0, sizeof(sentinel));
2043 cur = &sentinel;
2044
2045 buf = malloc(sizeof(*buf));
2046 if (!buf) {
2047 h_errno = NETDB_INTERNAL;
2048 return NS_NOTFOUND;
2049 }
2050 buf2 = malloc(sizeof(*buf2));
2051 if (!buf2) {
2052 free(buf);
2053 h_errno = NETDB_INTERNAL;
2054 return NS_NOTFOUND;
2055 }
2056
2057 switch (pai->ai_family) {
2058 case AF_UNSPEC:
2059 q.name = hostname;
2060 q.qclass = C_IN;
2061 q.qtype = T_A;
2062 q.answer = buf->buf;
2063 q.anslen = sizeof(buf->buf);
2064 q.next = &q2;
2065 q2.name = hostname;
2066 q2.qclass = C_IN;
2067 q2.qtype = T_AAAA;
2068 q2.answer = buf2->buf;
2069 q2.anslen = sizeof(buf2->buf);
2070 break;
2071 case AF_INET:
2072 q.name = hostname;
2073 q.qclass = C_IN;
2074 q.qtype = T_A;
2075 q.answer = buf->buf;
2076 q.anslen = sizeof(buf->buf);
2077 break;
2078 case AF_INET6:
2079 q.name = hostname;
2080 q.qclass = C_IN;
2081 q.qtype = T_AAAA;
2082 q.answer = buf->buf;
2083 q.anslen = sizeof(buf->buf);
2084 break;
2085 default:
2086 free(buf);
2087 free(buf2);
2088 return NS_UNAVAIL;
2089 }
2090
2091 res = __res_state();
2092 if ((res->options & RES_INIT) == 0 && res_ninit(res) == -1) {
2093 RES_SET_H_ERRNO(res, NETDB_INTERNAL);
2094 free(buf);
2095 free(buf2);
2096 return NS_NOTFOUND;
2097 }
2098
2099 if (res_searchN(hostname, &q, res) < 0) {
2100 free(buf);
2101 free(buf2);
2102 return NS_NOTFOUND;
2103 }
2104 /* prefer IPv6 */
2105 if (q.next) {
2106 ai = getanswer(buf2, q2.n, q2.name, q2.qtype, pai, res);
2107 if (ai) {
2108 cur->ai_next = ai;
2109 while (cur && cur->ai_next)
2110 cur = cur->ai_next;
2111 }
2112 }
2113 ai = getanswer(buf, q.n, q.name, q.qtype, pai, res);
2114 if (ai)
2115 cur->ai_next = ai;
2116 free(buf);
2117 free(buf2);
2118 if (sentinel.ai_next == NULL)
2119 switch (res->res_h_errno) {
2120 case HOST_NOT_FOUND:
2121 return NS_NOTFOUND;
2122 case TRY_AGAIN:
2123 return NS_TRYAGAIN;
2124 default:
2125 return NS_UNAVAIL;
2126 }
2127 *((struct addrinfo **)rv) = sentinel.ai_next;
2128 return NS_SUCCESS;
2129 }
2130
2131 static void
2132 _sethtent(FILE **hostf)
2133 {
2134 if (!*hostf)
2135 *hostf = fopen(_PATH_HOSTS, "r");
2136 else
2137 rewind(*hostf);
2138 }
2139
2140 static void
2141 _endhtent(FILE **hostf)
2142 {
2143 if (*hostf) {
2144 fclose(*hostf);
2145 *hostf = NULL;
2146 }
2147 }
2148
2149 static struct addrinfo *
2150 _gethtent(FILE **hostf, const char *name, const struct addrinfo *pai)
2151 {
2152 char *p;
2153 char *cp, *tname, *cname;
2154 struct addrinfo hints, *res0, *res;
2155 int error;
2156 const char *addr;
2157 char hostbuf[8*1024];
2158
2159 if (!*hostf && !(*hostf = fopen(_PATH_HOSTS, "r")))
2160 return (NULL);
2161 again:
2162 if (!(p = fgets(hostbuf, sizeof hostbuf, *hostf)))
2163 return (NULL);
2164 if (*p == '#')
2165 goto again;
2166 cp = strpbrk(p, "#\n");
2167 if (cp != NULL)
2168 *cp = '\0';
2169 if (!(cp = strpbrk(p, " \t")))
2170 goto again;
2171 *cp++ = '\0';
2172 addr = p;
2173 cname = NULL;
2174 /* if this is not something we're looking for, skip it. */
2175 while (cp && *cp) {
2176 if (*cp == ' ' || *cp == '\t') {
2177 cp++;
2178 continue;
2179 }
2180 tname = cp;
2181 if (cname == NULL)
2182 cname = cp;
2183 if ((cp = strpbrk(cp, " \t")) != NULL)
2184 *cp++ = '\0';
2185 if (strcasecmp(name, tname) == 0)
2186 goto found;
2187 }
2188 goto again;
2189
2190 found:
2191 /* we should not glob socktype/protocol here */
2192 memset(&hints, 0, sizeof(hints));
2193 hints.ai_family = pai->ai_family;
2194 hints.ai_socktype = SOCK_DGRAM;
2195 hints.ai_protocol = 0;
2196 hints.ai_flags = AI_NUMERICHOST;
2197 error = getaddrinfo(addr, "0", &hints, &res0);
2198 if (error)
2199 goto again;
2200 #ifdef FILTER_V4MAPPED
2201 /* XXX should check all items in the chain */
2202 if (res0->ai_family == AF_INET6 &&
2203 IN6_IS_ADDR_V4MAPPED(&((struct sockaddr_in6 *)res0->ai_addr)->sin6_addr)) {
2204 freeaddrinfo(res0);
2205 goto again;
2206 }
2207 #endif
2208 for (res = res0; res; res = res->ai_next) {
2209 /* cover it up */
2210 res->ai_flags = pai->ai_flags;
2211 res->ai_socktype = pai->ai_socktype;
2212 res->ai_protocol = pai->ai_protocol;
2213
2214 if (pai->ai_flags & AI_CANONNAME) {
2215 if (get_canonname(pai, res, cname) != 0) {
2216 freeaddrinfo(res0);
2217 goto again;
2218 }
2219 }
2220 }
2221 return res0;
2222 }
2223
2224 /*ARGSUSED*/
2225 static int
2226 _files_getaddrinfo(void *rv, void *cb_data __unused, va_list ap)
2227 {
2228 const char *name;
2229 const struct addrinfo *pai;
2230 struct addrinfo sentinel, *cur;
2231 struct addrinfo *p;
2232 FILE *hostf = NULL;
2233
2234 name = va_arg(ap, char *);
2235 pai = va_arg(ap, struct addrinfo *);
2236
2237 memset(&sentinel, 0, sizeof(sentinel));
2238 cur = &sentinel;
2239
2240 _sethtent(&hostf);
2241 while ((p = _gethtent(&hostf, name, pai)) != NULL) {
2242 cur->ai_next = p;
2243 while (cur && cur->ai_next)
2244 cur = cur->ai_next;
2245 }
2246 _endhtent(&hostf);
2247
2248 *((struct addrinfo **)rv) = sentinel.ai_next;
2249 if (sentinel.ai_next == NULL)
2250 return NS_NOTFOUND;
2251 return NS_SUCCESS;
2252 }
2253
2254 #ifdef YP
2255 /*ARGSUSED*/
2256 static struct addrinfo *
2257 _yphostent(char *line, const struct addrinfo *pai)
2258 {
2259 struct addrinfo sentinel, *cur;
2260 struct addrinfo hints, *res, *res0;
2261 int error;
2262 char *p = line;
2263 const char *addr, *canonname;
2264 char *nextline;
2265 char *cp;
2266
2267 addr = canonname = NULL;
2268
2269 memset(&sentinel, 0, sizeof(sentinel));
2270 cur = &sentinel;
2271
2272 nextline:
2273 /* terminate line */
2274 cp = strchr(p, '\n');
2275 if (cp) {
2276 *cp++ = '\0';
2277 nextline = cp;
2278 } else
2279 nextline = NULL;
2280
2281 cp = strpbrk(p, " \t");
2282 if (cp == NULL) {
2283 if (canonname == NULL)
2284 return (NULL);
2285 else
2286 goto done;
2287 }
2288 *cp++ = '\0';
2289
2290 addr = p;
2291
2292 while (cp && *cp) {
2293 if (*cp == ' ' || *cp == '\t') {
2294 cp++;
2295 continue;
2296 }
2297 if (!canonname)
2298 canonname = cp;
2299 if ((cp = strpbrk(cp, " \t")) != NULL)
2300 *cp++ = '\0';
2301 }
2302
2303 hints = *pai;
2304 hints.ai_flags = AI_NUMERICHOST;
2305 error = getaddrinfo(addr, NULL, &hints, &res0);
2306 if (error == 0) {
2307 for (res = res0; res; res = res->ai_next) {
2308 /* cover it up */
2309 res->ai_flags = pai->ai_flags;
2310
2311 if (pai->ai_flags & AI_CANONNAME)
2312 get_canonname(pai, res, canonname);
2313 }
2314 } else
2315 res0 = NULL;
2316 if (res0) {
2317 cur->ai_next = res0;
2318 while (cur && cur->ai_next)
2319 cur = cur->ai_next;
2320 }
2321
2322 if (nextline) {
2323 p = nextline;
2324 goto nextline;
2325 }
2326
2327 done:
2328 return sentinel.ai_next;
2329 }
2330
2331 /*ARGSUSED*/
2332 static int
2333 _yp_getaddrinfo(void *rv, void *cb_data __unused, va_list ap)
2334 {
2335 struct addrinfo sentinel, *cur;
2336 struct addrinfo *ai = NULL;
2337 char *ypbuf;
2338 int ypbuflen, r;
2339 const char *name;
2340 const struct addrinfo *pai;
2341 char *ypdomain;
2342
2343 if (_yp_check(&ypdomain) == 0)
2344 return NS_UNAVAIL;
2345
2346 name = va_arg(ap, char *);
2347 pai = va_arg(ap, const struct addrinfo *);
2348
2349 memset(&sentinel, 0, sizeof(sentinel));
2350 cur = &sentinel;
2351
2352 /* hosts.byname is only for IPv4 (Solaris8) */
2353 if (pai->ai_family == PF_UNSPEC || pai->ai_family == PF_INET) {
2354 r = yp_match(ypdomain, "hosts.byname", name,
2355 (int)strlen(name), &ypbuf, &ypbuflen);
2356 if (r == 0) {
2357 struct addrinfo ai4;
2358
2359 ai4 = *pai;
2360 ai4.ai_family = AF_INET;
2361 ai = _yphostent(ypbuf, &ai4);
2362 if (ai) {
2363 cur->ai_next = ai;
2364 while (cur && cur->ai_next)
2365 cur = cur->ai_next;
2366 }
2367 free(ypbuf);
2368 }
2369 }
2370
2371 /* ipnodes.byname can hold both IPv4/v6 */
2372 r = yp_match(ypdomain, "ipnodes.byname", name,
2373 (int)strlen(name), &ypbuf, &ypbuflen);
2374 if (r == 0) {
2375 ai = _yphostent(ypbuf, pai);
2376 if (ai)
2377 cur->ai_next = ai;
2378 free(ypbuf);
2379 }
2380
2381 if (sentinel.ai_next == NULL) {
2382 RES_SET_H_ERRNO(__res_state(), HOST_NOT_FOUND);
2383 return NS_NOTFOUND;
2384 }
2385 *((struct addrinfo **)rv) = sentinel.ai_next;
2386 return NS_SUCCESS;
2387 }
2388 #endif
2389
2390 /* resolver logic */
2391
2392 /*
2393 * Formulate a normal query, send, and await answer.
2394 * Returned answer is placed in supplied buffer "answer".
2395 * Perform preliminary check of answer, returning success only
2396 * if no error is indicated and the answer count is nonzero.
2397 * Return the size of the response on success, -1 on error.
2398 * Error number is left in h_errno.
2399 *
2400 * Caller must parse answer and determine whether it answers the question.
2401 */
2402 static int
2403 res_queryN(const char *name, struct res_target *target, res_state res)
2404 {
2405 u_char *buf;
2406 HEADER *hp;
2407 int n;
2408 u_int oflags;
2409 struct res_target *t;
2410 int rcode;
2411 int ancount;
2412
2413 rcode = NOERROR;
2414 ancount = 0;
2415
2416 buf = malloc(MAXPACKET);
2417 if (!buf) {
2418 RES_SET_H_ERRNO(res, NETDB_INTERNAL);
2419 return -1;
2420 }
2421
2422 for (t = target; t; t = t->next) {
2423 int class, type;
2424 u_char *answer;
2425 int anslen;
2426
2427 hp = (HEADER *)(void *)t->answer;
2428
2429 /* make it easier... */
2430 class = t->qclass;
2431 type = t->qtype;
2432 answer = t->answer;
2433 anslen = t->anslen;
2434
2435 oflags = res->_flags;
2436
2437 again:
2438 hp->rcode = NOERROR; /* default */
2439
2440 #ifdef DEBUG
2441 if (res->options & RES_DEBUG)
2442 printf(";; res_query(%s, %d, %d)\n", name, class, type);
2443 #endif
2444
2445 n = res_nmkquery(res, QUERY, name, class, type, NULL, 0, NULL,
2446 buf, MAXPACKET);
2447 if (n > 0 && (res->_flags & RES_F_EDNS0ERR) == 0 &&
2448 (res->options & (RES_USE_EDNS0|RES_USE_DNSSEC)) != 0U)
2449 n = res_nopt(res, n, buf, MAXPACKET, anslen);
2450 if (n <= 0) {
2451 #ifdef DEBUG
2452 if (res->options & RES_DEBUG)
2453 printf(";; res_query: mkquery failed\n");
2454 #endif
2455 free(buf);
2456 RES_SET_H_ERRNO(res, NO_RECOVERY);
2457 return (n);
2458 }
2459 n = res_nsend(res, buf, n, answer, anslen);
2460 if (n < 0) {
2461 /*
2462 * if the query choked with EDNS0, retry
2463 * without EDNS0
2464 */
2465 if ((res->options & (RES_USE_EDNS0|RES_USE_DNSSEC))
2466 != 0U &&
2467 ((oflags ^ res->_flags) & RES_F_EDNS0ERR) != 0) {
2468 res->_flags |= RES_F_EDNS0ERR;
2469 if (res->options & RES_DEBUG)
2470 printf(";; res_nquery: retry without EDNS0\n");
2471 goto again;
2472 }
2473 rcode = hp->rcode; /* record most recent error */
2474 #ifdef DEBUG
2475 if (res->options & RES_DEBUG)
2476 printf(";; res_query: send error\n");
2477 #endif
2478 continue;
2479 }
2480
2481 if (n > anslen)
2482 hp->rcode = FORMERR; /* XXX not very informative */
2483 if (hp->rcode != NOERROR || ntohs(hp->ancount) == 0) {
2484 rcode = hp->rcode; /* record most recent error */
2485 #ifdef DEBUG
2486 if (res->options & RES_DEBUG)
2487 printf(";; rcode = %u, ancount=%u\n", hp->rcode,
2488 ntohs(hp->ancount));
2489 #endif
2490 continue;
2491 }
2492
2493 ancount += ntohs(hp->ancount);
2494
2495 t->n = n;
2496 }
2497
2498 free(buf);
2499
2500 if (ancount == 0) {
2501 switch (rcode) {
2502 case NXDOMAIN:
2503 RES_SET_H_ERRNO(res, HOST_NOT_FOUND);
2504 break;
2505 case SERVFAIL:
2506 RES_SET_H_ERRNO(res, TRY_AGAIN);
2507 break;
2508 case NOERROR:
2509 RES_SET_H_ERRNO(res, NO_DATA);
2510 break;
2511 case FORMERR:
2512 case NOTIMP:
2513 case REFUSED:
2514 default:
2515 RES_SET_H_ERRNO(res, NO_RECOVERY);
2516 break;
2517 }
2518 return (-1);
2519 }
2520 return (ancount);
2521 }
2522
2523 /*
2524 * Formulate a normal query, send, and retrieve answer in supplied buffer.
2525 * Return the size of the response on success, -1 on error.
2526 * If enabled, implement search rules until answer or unrecoverable failure
2527 * is detected. Error code, if any, is left in h_errno.
2528 */
2529 static int
2530 res_searchN(const char *name, struct res_target *target, res_state res)
2531 {
2532 const char *cp, * const *domain;
2533 HEADER *hp = (HEADER *)(void *)target->answer; /*XXX*/
2534 u_int dots;
2535 int trailing_dot, ret, saved_herrno;
2536 int got_nodata = 0, got_servfail = 0, root_on_list = 0;
2537 int tried_as_is = 0;
2538 int searched = 0;
2539 char abuf[MAXDNAME];
2540
2541 errno = 0;
2542 RES_SET_H_ERRNO(res, HOST_NOT_FOUND); /* default, if we never query */
2543 dots = 0;
2544 for (cp = name; *cp; cp++)
2545 dots += (*cp == '.');
2546 trailing_dot = 0;
2547 if (cp > name && *--cp == '.')
2548 trailing_dot++;
2549
2550 /*
2551 * if there aren't any dots, it could be a user-level alias
2552 */
2553 if (!dots &&
2554 (cp = res_hostalias(res, name, abuf, sizeof(abuf))) != NULL)
2555 return (res_queryN(cp, target, res));
2556
2557 /*
2558 * If there are enough dots in the name, let's just give it a
2559 * try 'as is'. The threshold can be set with the "ndots" option.
2560 * Also, query 'as is', if there is a trailing dot in the name.
2561 */
2562 saved_herrno = -1;
2563 if (dots >= res->ndots || trailing_dot) {
2564 ret = res_querydomainN(name, NULL, target, res);
2565 if (ret > 0 || trailing_dot)
2566 return (ret);
2567 if (errno == ECONNREFUSED) {
2568 RES_SET_H_ERRNO(res, TRY_AGAIN);
2569 return (-1);
2570 }
2571 switch (res->res_h_errno) {
2572 case NO_DATA:
2573 case HOST_NOT_FOUND:
2574 break;
2575 case TRY_AGAIN:
2576 if (hp->rcode == SERVFAIL)
2577 break;
2578 /* FALLTHROUGH */
2579 default:
2580 return (-1);
2581 }
2582 saved_herrno = res->res_h_errno;
2583 tried_as_is++;
2584 }
2585
2586 /*
2587 * We do at least one level of search if
2588 * - there is no dot and RES_DEFNAME is set, or
2589 * - there is at least one dot, there is no trailing dot,
2590 * and RES_DNSRCH is set.
2591 */
2592 if ((!dots && (res->options & RES_DEFNAMES)) ||
2593 (dots && !trailing_dot && (res->options & RES_DNSRCH))) {
2594 int done = 0;
2595
2596 for (domain = (const char * const *)res->dnsrch;
2597 *domain && !done;
2598 domain++) {
2599 searched = 1;
2600
2601 if (domain[0][0] == '\0' ||
2602 (domain[0][0] == '.' && domain[0][1] == '\0'))
2603 root_on_list++;
2604
2605 if (root_on_list && tried_as_is)
2606 continue;
2607
2608 ret = res_querydomainN(name, *domain, target, res);
2609 if (ret > 0)
2610 return (ret);
2611
2612 /*
2613 * If no server present, give up.
2614 * If name isn't found in this domain,
2615 * keep trying higher domains in the search list
2616 * (if that's enabled).
2617 * On a NO_DATA error, keep trying, otherwise
2618 * a wildcard entry of another type could keep us
2619 * from finding this entry higher in the domain.
2620 * If we get some other error (negative answer or
2621 * server failure), then stop searching up,
2622 * but try the input name below in case it's
2623 * fully-qualified.
2624 */
2625 if (errno == ECONNREFUSED) {
2626 RES_SET_H_ERRNO(res, TRY_AGAIN);
2627 return (-1);
2628 }
2629
2630 switch (res->res_h_errno) {
2631 case NO_DATA:
2632 got_nodata++;
2633 /* FALLTHROUGH */
2634 case HOST_NOT_FOUND:
2635 /* keep trying */
2636 break;
2637 case TRY_AGAIN:
2638 got_servfail++;
2639 if (hp->rcode == SERVFAIL) {
2640 /* try next search element, if any */
2641 break;
2642 }
2643 /* FALLTHROUGH */
2644 default:
2645 /* anything else implies that we're done */
2646 done++;
2647 }
2648 /*
2649 * if we got here for some reason other than DNSRCH,
2650 * we only wanted one iteration of the loop, so stop.
2651 */
2652 if (!(res->options & RES_DNSRCH))
2653 done++;
2654 }
2655 }
2656
2657 switch (res->res_h_errno) {
2658 case NO_DATA:
2659 case HOST_NOT_FOUND:
2660 break;
2661 case TRY_AGAIN:
2662 if (hp->rcode == SERVFAIL)
2663 break;
2664 /* FALLTHROUGH */
2665 default:
2666 goto giveup;
2667 }
2668
2669 /*
2670 * If the query has not already been tried as is then try it
2671 * unless RES_NOTLDQUERY is set and there were no dots.
2672 */
2673 if ((dots || !searched || !(res->options & RES_NOTLDQUERY)) &&
2674 !(tried_as_is || root_on_list)) {
2675 ret = res_querydomainN(name, NULL, target, res);
2676 if (ret > 0)
2677 return (ret);
2678 }
2679
2680 /*
2681 * if we got here, we didn't satisfy the search.
2682 * if we did an initial full query, return that query's h_errno
2683 * (note that we wouldn't be here if that query had succeeded).
2684 * else if we ever got a nodata, send that back as the reason.
2685 * else send back meaningless h_errno, that being the one from
2686 * the last DNSRCH we did.
2687 */
2688 giveup:
2689 if (saved_herrno != -1)
2690 RES_SET_H_ERRNO(res, saved_herrno);
2691 else if (got_nodata)
2692 RES_SET_H_ERRNO(res, NO_DATA);
2693 else if (got_servfail)
2694 RES_SET_H_ERRNO(res, TRY_AGAIN);
2695 return (-1);
2696 }
2697
2698 /*
2699 * Perform a call on res_query on the concatenation of name and domain,
2700 * removing a trailing dot from name if domain is NULL.
2701 */
2702 static int
2703 res_querydomainN(const char *name, const char *domain,
2704 struct res_target *target, res_state res)
2705 {
2706 char nbuf[MAXDNAME];
2707 const char *longname = nbuf;
2708 size_t n, d;
2709
2710 #ifdef DEBUG
2711 if (res->options & RES_DEBUG)
2712 printf(";; res_querydomain(%s, %s)\n",
2713 name, domain?domain:"<Nil>");
2714 #endif
2715 if (domain == NULL) {
2716 /*
2717 * Check for trailing '.';
2718 * copy without '.' if present.
2719 */
2720 n = strlen(name);
2721 if (n >= MAXDNAME) {
2722 RES_SET_H_ERRNO(res, NO_RECOVERY);
2723 return (-1);
2724 }
2725 if (n > 0 && name[--n] == '.') {
2726 strncpy(nbuf, name, n);
2727 nbuf[n] = '\0';
2728 } else
2729 longname = name;
2730 } else {
2731 n = strlen(name);
2732 d = strlen(domain);
2733 if (n + d + 1 >= MAXDNAME) {
2734 RES_SET_H_ERRNO(res, NO_RECOVERY);
2735 return (-1);
2736 }
2737 snprintf(nbuf, sizeof(nbuf), "%s.%s", name, domain);
2738 }
2739 return (res_queryN(longname, target, res));
2740 }
DragonFly BSD