1 | /* Host and service name lookups using Name Service Switch modules. |
2 | Copyright (C) 1996-2018 Free Software Foundation, Inc. |
3 | This file is part of the GNU C Library. |
4 | |
5 | The GNU C Library is free software; you can redistribute it and/or |
6 | modify it under the terms of the GNU Lesser General Public |
7 | License as published by the Free Software Foundation; either |
8 | version 2.1 of the License, or (at your option) any later version. |
9 | |
10 | The GNU C Library is distributed in the hope that it will be useful, |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
13 | Lesser General Public License for more details. |
14 | |
15 | You should have received a copy of the GNU Lesser General Public |
16 | License along with the GNU C Library; if not, see |
17 | <http://www.gnu.org/licenses/>. */ |
18 | |
19 | /* The Inner Net License, Version 2.00 |
20 | |
21 | The author(s) grant permission for redistribution and use in source and |
22 | binary forms, with or without modification, of the software and documentation |
23 | provided that the following conditions are met: |
24 | |
25 | 0. If you receive a version of the software that is specifically labelled |
26 | as not being for redistribution (check the version message and/or README), |
27 | you are not permitted to redistribute that version of the software in any |
28 | way or form. |
29 | 1. All terms of the all other applicable copyrights and licenses must be |
30 | followed. |
31 | 2. Redistributions of source code must retain the authors' copyright |
32 | notice(s), this list of conditions, and the following disclaimer. |
33 | 3. Redistributions in binary form must reproduce the authors' copyright |
34 | notice(s), this list of conditions, and the following disclaimer in the |
35 | documentation and/or other materials provided with the distribution. |
36 | 4. [The copyright holder has authorized the removal of this clause.] |
37 | 5. Neither the name(s) of the author(s) nor the names of its contributors |
38 | may be used to endorse or promote products derived from this software |
39 | without specific prior written permission. |
40 | |
41 | THIS SOFTWARE IS PROVIDED BY ITS AUTHORS AND CONTRIBUTORS ``AS IS'' AND ANY |
42 | EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED |
43 | WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
44 | DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE FOR ANY |
45 | DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES |
46 | (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; |
47 | LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON |
48 | ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
49 | (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS |
50 | SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
51 | |
52 | If these license terms cause you a real problem, contact the author. */ |
53 | |
54 | /* This software is Copyright 1996 by Craig Metz, All Rights Reserved. */ |
55 | |
56 | #include <assert.h> |
57 | #include <ctype.h> |
58 | #include <errno.h> |
59 | #include <ifaddrs.h> |
60 | #include <netdb.h> |
61 | #include <nss.h> |
62 | #include <resolv/resolv-internal.h> |
63 | #include <resolv/resolv_context.h> |
64 | #include <resolv/res_use_inet6.h> |
65 | #include <stdbool.h> |
66 | #include <stdio.h> |
67 | #include <stdio_ext.h> |
68 | #include <stdlib.h> |
69 | #include <string.h> |
70 | #include <stdint.h> |
71 | #include <arpa/inet.h> |
72 | #include <net/if.h> |
73 | #include <netinet/in.h> |
74 | #include <sys/socket.h> |
75 | #include <sys/stat.h> |
76 | #include <sys/types.h> |
77 | #include <sys/un.h> |
78 | #include <sys/utsname.h> |
79 | #include <unistd.h> |
80 | #include <nsswitch.h> |
81 | #include <libc-lock.h> |
82 | #include <not-cancel.h> |
83 | #include <nscd/nscd-client.h> |
84 | #include <nscd/nscd_proto.h> |
85 | #include <scratch_buffer.h> |
86 | #include <inet/net-internal.h> |
87 | |
88 | #ifdef HAVE_LIBIDN |
89 | # include <idna.h> |
90 | #endif |
91 | |
92 | struct gaih_service |
93 | { |
94 | const char *name; |
95 | int num; |
96 | }; |
97 | |
98 | struct gaih_servtuple |
99 | { |
100 | struct gaih_servtuple *next; |
101 | int socktype; |
102 | int protocol; |
103 | int port; |
104 | }; |
105 | |
106 | static const struct gaih_servtuple nullserv; |
107 | |
108 | |
109 | struct gaih_typeproto |
110 | { |
111 | int socktype; |
112 | int protocol; |
113 | uint8_t protoflag; |
114 | bool defaultflag; |
115 | char name[8]; |
116 | }; |
117 | |
118 | /* Values for `protoflag'. */ |
119 | #define GAI_PROTO_NOSERVICE 1 |
120 | #define GAI_PROTO_PROTOANY 2 |
121 | |
122 | static const struct gaih_typeproto gaih_inet_typeproto[] = |
123 | { |
124 | { 0, 0, 0, false, "" }, |
125 | { SOCK_STREAM, IPPROTO_TCP, 0, true, "tcp" }, |
126 | { SOCK_DGRAM, IPPROTO_UDP, 0, true, "udp" }, |
127 | #if defined SOCK_DCCP && defined IPPROTO_DCCP |
128 | { SOCK_DCCP, IPPROTO_DCCP, 0, false, "dccp" }, |
129 | #endif |
130 | #ifdef IPPROTO_UDPLITE |
131 | { SOCK_DGRAM, IPPROTO_UDPLITE, 0, false, "udplite" }, |
132 | #endif |
133 | #ifdef IPPROTO_SCTP |
134 | { SOCK_STREAM, IPPROTO_SCTP, 0, false, "sctp" }, |
135 | { SOCK_SEQPACKET, IPPROTO_SCTP, 0, false, "sctp" }, |
136 | #endif |
137 | { SOCK_RAW, 0, GAI_PROTO_PROTOANY|GAI_PROTO_NOSERVICE, true, "raw" }, |
138 | { 0, 0, 0, false, "" } |
139 | }; |
140 | |
141 | static const struct addrinfo default_hints = |
142 | { |
143 | .ai_flags = AI_DEFAULT, |
144 | .ai_family = PF_UNSPEC, |
145 | .ai_socktype = 0, |
146 | .ai_protocol = 0, |
147 | .ai_addrlen = 0, |
148 | .ai_addr = NULL, |
149 | .ai_canonname = NULL, |
150 | .ai_next = NULL |
151 | }; |
152 | |
153 | |
154 | static int |
155 | gaih_inet_serv (const char *servicename, const struct gaih_typeproto *tp, |
156 | const struct addrinfo *req, struct gaih_servtuple *st, |
157 | struct scratch_buffer *tmpbuf) |
158 | { |
159 | struct servent *s; |
160 | struct servent ts; |
161 | int r; |
162 | |
163 | do |
164 | { |
165 | r = __getservbyname_r (servicename, tp->name, &ts, |
166 | tmpbuf->data, tmpbuf->length, &s); |
167 | if (r != 0 || s == NULL) |
168 | { |
169 | if (r == ERANGE) |
170 | { |
171 | if (!scratch_buffer_grow (tmpbuf)) |
172 | return -EAI_MEMORY; |
173 | } |
174 | else |
175 | return -EAI_SERVICE; |
176 | } |
177 | } |
178 | while (r); |
179 | |
180 | st->next = NULL; |
181 | st->socktype = tp->socktype; |
182 | st->protocol = ((tp->protoflag & GAI_PROTO_PROTOANY) |
183 | ? req->ai_protocol : tp->protocol); |
184 | st->port = s->s_port; |
185 | |
186 | return 0; |
187 | } |
188 | |
189 | /* Convert struct hostent to a list of struct gaih_addrtuple objects. |
190 | h_name is not copied, and the struct hostent object must not be |
191 | deallocated prematurely. *RESULT must be NULL or a pointer to a |
192 | linked-list. The new addresses are appended at the end. */ |
193 | static bool |
194 | convert_hostent_to_gaih_addrtuple (const struct addrinfo *req, |
195 | int family, |
196 | struct hostent *h, |
197 | struct gaih_addrtuple **result) |
198 | { |
199 | while (*result) |
200 | result = &(*result)->next; |
201 | |
202 | /* Count the number of addresses in h->h_addr_list. */ |
203 | size_t count = 0; |
204 | for (char **p = h->h_addr_list; *p != NULL; ++p) |
205 | ++count; |
206 | |
207 | /* Report no data if no addresses are available, or if the incoming |
208 | address size is larger than what we can store. */ |
209 | if (count == 0 || h->h_length > sizeof (((struct gaih_addrtuple) {}).addr)) |
210 | return true; |
211 | |
212 | struct gaih_addrtuple *array = calloc (count, sizeof (*array)); |
213 | if (array == NULL) |
214 | return false; |
215 | |
216 | for (size_t i = 0; i < count; ++i) |
217 | { |
218 | if (family == AF_INET && req->ai_family == AF_INET6) |
219 | { |
220 | /* Perform address mapping. */ |
221 | array[i].family = AF_INET6; |
222 | memcpy(array[i].addr + 3, h->h_addr_list[i], sizeof (uint32_t)); |
223 | array[i].addr[2] = htonl (0xffff); |
224 | } |
225 | else |
226 | { |
227 | array[i].family = family; |
228 | memcpy (array[i].addr, h->h_addr_list[i], h->h_length); |
229 | } |
230 | array[i].next = array + i + 1; |
231 | } |
232 | array[0].name = h->h_name; |
233 | array[count - 1].next = NULL; |
234 | |
235 | *result = array; |
236 | return true; |
237 | } |
238 | |
239 | #define gethosts(_family, _type) \ |
240 | { \ |
241 | struct hostent th; \ |
242 | char *localcanon = NULL; \ |
243 | no_data = 0; \ |
244 | while (1) \ |
245 | { \ |
246 | status = DL_CALL_FCT (fct, (name, _family, &th, \ |
247 | tmpbuf->data, tmpbuf->length, \ |
248 | &errno, &h_errno, NULL, &localcanon)); \ |
249 | if (status != NSS_STATUS_TRYAGAIN || h_errno != NETDB_INTERNAL \ |
250 | || errno != ERANGE) \ |
251 | break; \ |
252 | if (!scratch_buffer_grow (tmpbuf)) \ |
253 | { \ |
254 | __resolv_context_enable_inet6 (res_ctx, res_enable_inet6); \ |
255 | __resolv_context_put (res_ctx); \ |
256 | result = -EAI_MEMORY; \ |
257 | goto free_and_return; \ |
258 | } \ |
259 | } \ |
260 | if (status == NSS_STATUS_NOTFOUND \ |
261 | || status == NSS_STATUS_TRYAGAIN || status == NSS_STATUS_UNAVAIL) \ |
262 | { \ |
263 | if (h_errno == NETDB_INTERNAL) \ |
264 | { \ |
265 | __resolv_context_enable_inet6 (res_ctx, res_enable_inet6); \ |
266 | __resolv_context_put (res_ctx); \ |
267 | result = -EAI_SYSTEM; \ |
268 | goto free_and_return; \ |
269 | } \ |
270 | if (h_errno == TRY_AGAIN) \ |
271 | no_data = EAI_AGAIN; \ |
272 | else \ |
273 | no_data = h_errno == NO_DATA; \ |
274 | } \ |
275 | else if (status == NSS_STATUS_SUCCESS) \ |
276 | { \ |
277 | if (!convert_hostent_to_gaih_addrtuple (req, _family, &th, &addrmem)) \ |
278 | { \ |
279 | __resolv_context_enable_inet6 (res_ctx, res_enable_inet6); \ |
280 | __resolv_context_put (res_ctx); \ |
281 | result = -EAI_SYSTEM; \ |
282 | goto free_and_return; \ |
283 | } \ |
284 | *pat = addrmem; \ |
285 | \ |
286 | if (localcanon != NULL && canon == NULL) \ |
287 | { \ |
288 | canonbuf = __strdup (localcanon); \ |
289 | if (canonbuf == NULL) \ |
290 | { \ |
291 | result = -EAI_SYSTEM; \ |
292 | goto free_and_return; \ |
293 | } \ |
294 | canon = canonbuf; \ |
295 | } \ |
296 | if (_family == AF_INET6 && *pat != NULL) \ |
297 | got_ipv6 = true; \ |
298 | } \ |
299 | } |
300 | |
301 | |
302 | typedef enum nss_status (*nss_gethostbyname4_r) |
303 | (const char *name, struct gaih_addrtuple **pat, |
304 | char *buffer, size_t buflen, int *errnop, |
305 | int *h_errnop, int32_t *ttlp); |
306 | typedef enum nss_status (*nss_gethostbyname3_r) |
307 | (const char *name, int af, struct hostent *host, |
308 | char *buffer, size_t buflen, int *errnop, |
309 | int *h_errnop, int32_t *ttlp, char **canonp); |
310 | typedef enum nss_status (*nss_getcanonname_r) |
311 | (const char *name, char *buffer, size_t buflen, char **result, |
312 | int *errnop, int *h_errnop); |
313 | |
314 | /* This function is called if a canonical name is requested, but if |
315 | the service function did not provide it. It tries to obtain the |
316 | name using getcanonname_r from the same service NIP. If the name |
317 | cannot be canonicalized, return a copy of NAME. Return NULL on |
318 | memory allocation failure. The returned string is allocated on the |
319 | heap; the caller has to free it. */ |
320 | static char * |
321 | getcanonname (service_user *nip, struct gaih_addrtuple *at, const char *name) |
322 | { |
323 | nss_getcanonname_r cfct = __nss_lookup_function (nip, "getcanonname_r" ); |
324 | char *s = (char *) name; |
325 | if (cfct != NULL) |
326 | { |
327 | char buf[256]; |
328 | if (DL_CALL_FCT (cfct, (at->name ?: name, buf, sizeof (buf), |
329 | &s, &errno, &h_errno)) != NSS_STATUS_SUCCESS) |
330 | /* If the canonical name cannot be determined, use the passed |
331 | string. */ |
332 | s = (char *) name; |
333 | } |
334 | return __strdup (name); |
335 | } |
336 | |
337 | static int |
338 | gaih_inet (const char *name, const struct gaih_service *service, |
339 | const struct addrinfo *req, struct addrinfo **pai, |
340 | unsigned int *naddrs, struct scratch_buffer *tmpbuf) |
341 | { |
342 | const struct gaih_typeproto *tp = gaih_inet_typeproto; |
343 | struct gaih_servtuple *st = (struct gaih_servtuple *) &nullserv; |
344 | struct gaih_addrtuple *at = NULL; |
345 | bool got_ipv6 = false; |
346 | const char *canon = NULL; |
347 | const char *orig_name = name; |
348 | |
349 | /* Reserve stack memory for the scratch buffer in the getaddrinfo |
350 | function. */ |
351 | size_t alloca_used = sizeof (struct scratch_buffer); |
352 | |
353 | if (req->ai_protocol || req->ai_socktype) |
354 | { |
355 | ++tp; |
356 | |
357 | while (tp->name[0] |
358 | && ((req->ai_socktype != 0 && req->ai_socktype != tp->socktype) |
359 | || (req->ai_protocol != 0 |
360 | && !(tp->protoflag & GAI_PROTO_PROTOANY) |
361 | && req->ai_protocol != tp->protocol))) |
362 | ++tp; |
363 | |
364 | if (! tp->name[0]) |
365 | { |
366 | if (req->ai_socktype) |
367 | return -EAI_SOCKTYPE; |
368 | else |
369 | return -EAI_SERVICE; |
370 | } |
371 | } |
372 | |
373 | int port = 0; |
374 | if (service != NULL) |
375 | { |
376 | if ((tp->protoflag & GAI_PROTO_NOSERVICE) != 0) |
377 | return -EAI_SERVICE; |
378 | |
379 | if (service->num < 0) |
380 | { |
381 | if (tp->name[0]) |
382 | { |
383 | st = (struct gaih_servtuple *) |
384 | alloca_account (sizeof (struct gaih_servtuple), alloca_used); |
385 | |
386 | int rc = gaih_inet_serv (service->name, tp, req, st, tmpbuf); |
387 | if (__glibc_unlikely (rc != 0)) |
388 | return rc; |
389 | } |
390 | else |
391 | { |
392 | struct gaih_servtuple **pst = &st; |
393 | for (tp++; tp->name[0]; tp++) |
394 | { |
395 | struct gaih_servtuple *newp; |
396 | |
397 | if ((tp->protoflag & GAI_PROTO_NOSERVICE) != 0) |
398 | continue; |
399 | |
400 | if (req->ai_socktype != 0 |
401 | && req->ai_socktype != tp->socktype) |
402 | continue; |
403 | if (req->ai_protocol != 0 |
404 | && !(tp->protoflag & GAI_PROTO_PROTOANY) |
405 | && req->ai_protocol != tp->protocol) |
406 | continue; |
407 | |
408 | newp = (struct gaih_servtuple *) |
409 | alloca_account (sizeof (struct gaih_servtuple), |
410 | alloca_used); |
411 | |
412 | if (gaih_inet_serv (service->name, |
413 | tp, req, newp, tmpbuf) != 0) |
414 | continue; |
415 | |
416 | *pst = newp; |
417 | pst = &(newp->next); |
418 | } |
419 | if (st == (struct gaih_servtuple *) &nullserv) |
420 | return -EAI_SERVICE; |
421 | } |
422 | } |
423 | else |
424 | { |
425 | port = htons (service->num); |
426 | goto got_port; |
427 | } |
428 | } |
429 | else |
430 | { |
431 | got_port: |
432 | |
433 | if (req->ai_socktype || req->ai_protocol) |
434 | { |
435 | st = alloca_account (sizeof (struct gaih_servtuple), alloca_used); |
436 | st->next = NULL; |
437 | st->socktype = tp->socktype; |
438 | st->protocol = ((tp->protoflag & GAI_PROTO_PROTOANY) |
439 | ? req->ai_protocol : tp->protocol); |
440 | st->port = port; |
441 | } |
442 | else |
443 | { |
444 | /* Neither socket type nor protocol is set. Return all socket types |
445 | we know about. */ |
446 | struct gaih_servtuple **lastp = &st; |
447 | for (++tp; tp->name[0]; ++tp) |
448 | if (tp->defaultflag) |
449 | { |
450 | struct gaih_servtuple *newp; |
451 | |
452 | newp = alloca_account (sizeof (struct gaih_servtuple), |
453 | alloca_used); |
454 | newp->next = NULL; |
455 | newp->socktype = tp->socktype; |
456 | newp->protocol = tp->protocol; |
457 | newp->port = port; |
458 | |
459 | *lastp = newp; |
460 | lastp = &newp->next; |
461 | } |
462 | } |
463 | } |
464 | |
465 | bool malloc_name = false; |
466 | struct gaih_addrtuple *addrmem = NULL; |
467 | char *canonbuf = NULL; |
468 | int result = 0; |
469 | |
470 | if (name != NULL) |
471 | { |
472 | at = alloca_account (sizeof (struct gaih_addrtuple), alloca_used); |
473 | at->family = AF_UNSPEC; |
474 | at->scopeid = 0; |
475 | at->next = NULL; |
476 | |
477 | #ifdef HAVE_LIBIDN |
478 | if (req->ai_flags & AI_IDN) |
479 | { |
480 | int idn_flags = 0; |
481 | if (req->ai_flags & AI_IDN_ALLOW_UNASSIGNED) |
482 | idn_flags |= IDNA_ALLOW_UNASSIGNED; |
483 | if (req->ai_flags & AI_IDN_USE_STD3_ASCII_RULES) |
484 | idn_flags |= IDNA_USE_STD3_ASCII_RULES; |
485 | |
486 | char *p = NULL; |
487 | int rc = __idna_to_ascii_lz (name, &p, idn_flags); |
488 | if (rc != IDNA_SUCCESS) |
489 | { |
490 | /* No need to jump to free_and_return here. */ |
491 | if (rc == IDNA_MALLOC_ERROR) |
492 | return -EAI_MEMORY; |
493 | if (rc == IDNA_DLOPEN_ERROR) |
494 | return -EAI_SYSTEM; |
495 | return -EAI_IDN_ENCODE; |
496 | } |
497 | /* In case the output string is the same as the input string |
498 | no new string has been allocated. */ |
499 | if (p != name) |
500 | { |
501 | name = p; |
502 | malloc_name = true; |
503 | } |
504 | } |
505 | #endif |
506 | |
507 | if (__inet_aton (name, (struct in_addr *) at->addr) != 0) |
508 | { |
509 | if (req->ai_family == AF_UNSPEC || req->ai_family == AF_INET) |
510 | at->family = AF_INET; |
511 | else if (req->ai_family == AF_INET6 && (req->ai_flags & AI_V4MAPPED)) |
512 | { |
513 | at->addr[3] = at->addr[0]; |
514 | at->addr[2] = htonl (0xffff); |
515 | at->addr[1] = 0; |
516 | at->addr[0] = 0; |
517 | at->family = AF_INET6; |
518 | } |
519 | else |
520 | { |
521 | result = -EAI_ADDRFAMILY; |
522 | goto free_and_return; |
523 | } |
524 | |
525 | if (req->ai_flags & AI_CANONNAME) |
526 | canon = name; |
527 | } |
528 | else if (at->family == AF_UNSPEC) |
529 | { |
530 | char *scope_delim = strchr (name, SCOPE_DELIMITER); |
531 | int e; |
532 | if (scope_delim == NULL) |
533 | e = inet_pton (AF_INET6, name, at->addr); |
534 | else |
535 | e = __inet_pton_length (AF_INET6, name, scope_delim - name, |
536 | at->addr); |
537 | if (e > 0) |
538 | { |
539 | if (req->ai_family == AF_UNSPEC || req->ai_family == AF_INET6) |
540 | at->family = AF_INET6; |
541 | else if (req->ai_family == AF_INET |
542 | && IN6_IS_ADDR_V4MAPPED (at->addr)) |
543 | { |
544 | at->addr[0] = at->addr[3]; |
545 | at->family = AF_INET; |
546 | } |
547 | else |
548 | { |
549 | result = -EAI_ADDRFAMILY; |
550 | goto free_and_return; |
551 | } |
552 | |
553 | if (scope_delim != NULL |
554 | && __inet6_scopeid_pton ((struct in6_addr *) at->addr, |
555 | scope_delim + 1, |
556 | &at->scopeid) != 0) |
557 | { |
558 | result = -EAI_NONAME; |
559 | goto free_and_return; |
560 | } |
561 | |
562 | if (req->ai_flags & AI_CANONNAME) |
563 | canon = name; |
564 | } |
565 | } |
566 | |
567 | if (at->family == AF_UNSPEC && (req->ai_flags & AI_NUMERICHOST) == 0) |
568 | { |
569 | struct gaih_addrtuple **pat = &at; |
570 | int no_data = 0; |
571 | int no_inet6_data = 0; |
572 | service_user *nip; |
573 | enum nss_status inet6_status = NSS_STATUS_UNAVAIL; |
574 | enum nss_status status = NSS_STATUS_UNAVAIL; |
575 | int no_more; |
576 | struct resolv_context *res_ctx = NULL; |
577 | bool res_enable_inet6 = false; |
578 | |
579 | /* If we do not have to look for IPv6 addresses or the canonical |
580 | name, use the simple, old functions, which do not support |
581 | IPv6 scope ids, nor retrieving the canonical name. */ |
582 | if (req->ai_family == AF_INET |
583 | && (req->ai_flags & AI_CANONNAME) == 0) |
584 | { |
585 | int rc; |
586 | struct hostent th; |
587 | struct hostent *h; |
588 | |
589 | while (1) |
590 | { |
591 | rc = __gethostbyname2_r (name, AF_INET, &th, |
592 | tmpbuf->data, tmpbuf->length, |
593 | &h, &h_errno); |
594 | if (rc != ERANGE || h_errno != NETDB_INTERNAL) |
595 | break; |
596 | if (!scratch_buffer_grow (tmpbuf)) |
597 | { |
598 | result = -EAI_MEMORY; |
599 | goto free_and_return; |
600 | } |
601 | } |
602 | |
603 | if (rc == 0) |
604 | { |
605 | if (h != NULL) |
606 | { |
607 | /* We found data, convert it. */ |
608 | if (!convert_hostent_to_gaih_addrtuple |
609 | (req, AF_INET, h, &addrmem)) |
610 | { |
611 | result = -EAI_MEMORY; |
612 | goto free_and_return; |
613 | } |
614 | *pat = addrmem; |
615 | } |
616 | else |
617 | { |
618 | if (h_errno == NO_DATA) |
619 | result = -EAI_NODATA; |
620 | else |
621 | result = -EAI_NONAME; |
622 | goto free_and_return; |
623 | } |
624 | } |
625 | else |
626 | { |
627 | if (h_errno == NETDB_INTERNAL) |
628 | result = -EAI_SYSTEM; |
629 | else if (h_errno == TRY_AGAIN) |
630 | result = -EAI_AGAIN; |
631 | else |
632 | /* We made requests but they turned out no data. |
633 | The name is known, though. */ |
634 | result = -EAI_NODATA; |
635 | |
636 | goto free_and_return; |
637 | } |
638 | |
639 | goto process_list; |
640 | } |
641 | |
642 | #ifdef USE_NSCD |
643 | if (__nss_not_use_nscd_hosts > 0 |
644 | && ++__nss_not_use_nscd_hosts > NSS_NSCD_RETRY) |
645 | __nss_not_use_nscd_hosts = 0; |
646 | |
647 | if (!__nss_not_use_nscd_hosts |
648 | && !__nss_database_custom[NSS_DBSIDX_hosts]) |
649 | { |
650 | /* Try to use nscd. */ |
651 | struct nscd_ai_result *air = NULL; |
652 | int err = __nscd_getai (name, &air, &h_errno); |
653 | if (air != NULL) |
654 | { |
655 | /* Transform into gaih_addrtuple list. */ |
656 | bool added_canon = (req->ai_flags & AI_CANONNAME) == 0; |
657 | char *addrs = air->addrs; |
658 | |
659 | addrmem = calloc (air->naddrs, sizeof (*addrmem)); |
660 | if (addrmem == NULL) |
661 | { |
662 | result = -EAI_MEMORY; |
663 | goto free_and_return; |
664 | } |
665 | |
666 | struct gaih_addrtuple *addrfree = addrmem; |
667 | for (int i = 0; i < air->naddrs; ++i) |
668 | { |
669 | socklen_t size = (air->family[i] == AF_INET |
670 | ? INADDRSZ : IN6ADDRSZ); |
671 | |
672 | if (!((air->family[i] == AF_INET |
673 | && req->ai_family == AF_INET6 |
674 | && (req->ai_flags & AI_V4MAPPED) != 0) |
675 | || req->ai_family == AF_UNSPEC |
676 | || air->family[i] == req->ai_family)) |
677 | { |
678 | /* Skip over non-matching result. */ |
679 | addrs += size; |
680 | continue; |
681 | } |
682 | |
683 | if (*pat == NULL) |
684 | { |
685 | *pat = addrfree++; |
686 | (*pat)->scopeid = 0; |
687 | } |
688 | uint32_t *pataddr = (*pat)->addr; |
689 | (*pat)->next = NULL; |
690 | if (added_canon || air->canon == NULL) |
691 | (*pat)->name = NULL; |
692 | else if (canonbuf == NULL) |
693 | { |
694 | canonbuf = __strdup (air->canon); |
695 | if (canonbuf == NULL) |
696 | { |
697 | result = -EAI_MEMORY; |
698 | goto free_and_return; |
699 | } |
700 | canon = (*pat)->name = canonbuf; |
701 | } |
702 | |
703 | if (air->family[i] == AF_INET |
704 | && req->ai_family == AF_INET6 |
705 | && (req->ai_flags & AI_V4MAPPED)) |
706 | { |
707 | (*pat)->family = AF_INET6; |
708 | pataddr[3] = *(uint32_t *) addrs; |
709 | pataddr[2] = htonl (0xffff); |
710 | pataddr[1] = 0; |
711 | pataddr[0] = 0; |
712 | pat = &((*pat)->next); |
713 | added_canon = true; |
714 | } |
715 | else if (req->ai_family == AF_UNSPEC |
716 | || air->family[i] == req->ai_family) |
717 | { |
718 | (*pat)->family = air->family[i]; |
719 | memcpy (pataddr, addrs, size); |
720 | pat = &((*pat)->next); |
721 | added_canon = true; |
722 | if (air->family[i] == AF_INET6) |
723 | got_ipv6 = true; |
724 | } |
725 | addrs += size; |
726 | } |
727 | |
728 | free (air); |
729 | |
730 | if (at->family == AF_UNSPEC) |
731 | { |
732 | result = -EAI_NONAME; |
733 | goto free_and_return; |
734 | } |
735 | |
736 | goto process_list; |
737 | } |
738 | else if (err == 0) |
739 | /* The database contains a negative entry. */ |
740 | goto free_and_return; |
741 | else if (__nss_not_use_nscd_hosts == 0) |
742 | { |
743 | if (h_errno == NETDB_INTERNAL && errno == ENOMEM) |
744 | result = -EAI_MEMORY; |
745 | else if (h_errno == TRY_AGAIN) |
746 | result = -EAI_AGAIN; |
747 | else |
748 | result = -EAI_SYSTEM; |
749 | |
750 | goto free_and_return; |
751 | } |
752 | } |
753 | #endif |
754 | |
755 | if (__nss_hosts_database == NULL) |
756 | no_more = __nss_database_lookup ("hosts" , NULL, |
757 | "dns [!UNAVAIL=return] files" , |
758 | &__nss_hosts_database); |
759 | else |
760 | no_more = 0; |
761 | nip = __nss_hosts_database; |
762 | |
763 | /* If we are looking for both IPv4 and IPv6 address we don't |
764 | want the lookup functions to automatically promote IPv4 |
765 | addresses to IPv6 addresses, so we use the no_inet6 |
766 | function variant. */ |
767 | res_ctx = __resolv_context_get (); |
768 | res_enable_inet6 = __resolv_context_disable_inet6 (res_ctx); |
769 | if (res_ctx == NULL) |
770 | no_more = 1; |
771 | |
772 | while (!no_more) |
773 | { |
774 | no_data = 0; |
775 | nss_gethostbyname4_r fct4 = NULL; |
776 | |
777 | /* gethostbyname4_r sends out parallel A and AAAA queries and |
778 | is thus only suitable for PF_UNSPEC. */ |
779 | if (req->ai_family == PF_UNSPEC) |
780 | fct4 = __nss_lookup_function (nip, "gethostbyname4_r" ); |
781 | |
782 | if (fct4 != NULL) |
783 | { |
784 | while (1) |
785 | { |
786 | status = DL_CALL_FCT (fct4, (name, pat, |
787 | tmpbuf->data, tmpbuf->length, |
788 | &errno, &h_errno, |
789 | NULL)); |
790 | if (status == NSS_STATUS_SUCCESS) |
791 | break; |
792 | if (status != NSS_STATUS_TRYAGAIN |
793 | || errno != ERANGE || h_errno != NETDB_INTERNAL) |
794 | { |
795 | if (h_errno == TRY_AGAIN) |
796 | no_data = EAI_AGAIN; |
797 | else |
798 | no_data = h_errno == NO_DATA; |
799 | break; |
800 | } |
801 | |
802 | if (!scratch_buffer_grow (tmpbuf)) |
803 | { |
804 | __resolv_context_enable_inet6 |
805 | (res_ctx, res_enable_inet6); |
806 | __resolv_context_put (res_ctx); |
807 | result = -EAI_MEMORY; |
808 | goto free_and_return; |
809 | } |
810 | } |
811 | |
812 | if (status == NSS_STATUS_SUCCESS) |
813 | { |
814 | assert (!no_data); |
815 | no_data = 1; |
816 | |
817 | if ((req->ai_flags & AI_CANONNAME) != 0 && canon == NULL) |
818 | canon = (*pat)->name; |
819 | |
820 | while (*pat != NULL) |
821 | { |
822 | if ((*pat)->family == AF_INET |
823 | && req->ai_family == AF_INET6 |
824 | && (req->ai_flags & AI_V4MAPPED) != 0) |
825 | { |
826 | uint32_t *pataddr = (*pat)->addr; |
827 | (*pat)->family = AF_INET6; |
828 | pataddr[3] = pataddr[0]; |
829 | pataddr[2] = htonl (0xffff); |
830 | pataddr[1] = 0; |
831 | pataddr[0] = 0; |
832 | pat = &((*pat)->next); |
833 | no_data = 0; |
834 | } |
835 | else if (req->ai_family == AF_UNSPEC |
836 | || (*pat)->family == req->ai_family) |
837 | { |
838 | pat = &((*pat)->next); |
839 | |
840 | no_data = 0; |
841 | if (req->ai_family == AF_INET6) |
842 | got_ipv6 = true; |
843 | } |
844 | else |
845 | *pat = ((*pat)->next); |
846 | } |
847 | } |
848 | |
849 | no_inet6_data = no_data; |
850 | } |
851 | else |
852 | { |
853 | nss_gethostbyname3_r fct = NULL; |
854 | if (req->ai_flags & AI_CANONNAME) |
855 | /* No need to use this function if we do not look for |
856 | the canonical name. The function does not exist in |
857 | all NSS modules and therefore the lookup would |
858 | often fail. */ |
859 | fct = __nss_lookup_function (nip, "gethostbyname3_r" ); |
860 | if (fct == NULL) |
861 | /* We are cheating here. The gethostbyname2_r |
862 | function does not have the same interface as |
863 | gethostbyname3_r but the extra arguments the |
864 | latter takes are added at the end. So the |
865 | gethostbyname2_r code will just ignore them. */ |
866 | fct = __nss_lookup_function (nip, "gethostbyname2_r" ); |
867 | |
868 | if (fct != NULL) |
869 | { |
870 | if (req->ai_family == AF_INET6 |
871 | || req->ai_family == AF_UNSPEC) |
872 | { |
873 | gethosts (AF_INET6, struct in6_addr); |
874 | no_inet6_data = no_data; |
875 | inet6_status = status; |
876 | } |
877 | if (req->ai_family == AF_INET |
878 | || req->ai_family == AF_UNSPEC |
879 | || (req->ai_family == AF_INET6 |
880 | && (req->ai_flags & AI_V4MAPPED) |
881 | /* Avoid generating the mapped addresses if we |
882 | know we are not going to need them. */ |
883 | && ((req->ai_flags & AI_ALL) || !got_ipv6))) |
884 | { |
885 | gethosts (AF_INET, struct in_addr); |
886 | |
887 | if (req->ai_family == AF_INET) |
888 | { |
889 | no_inet6_data = no_data; |
890 | inet6_status = status; |
891 | } |
892 | } |
893 | |
894 | /* If we found one address for AF_INET or AF_INET6, |
895 | don't continue the search. */ |
896 | if (inet6_status == NSS_STATUS_SUCCESS |
897 | || status == NSS_STATUS_SUCCESS) |
898 | { |
899 | if ((req->ai_flags & AI_CANONNAME) != 0 |
900 | && canon == NULL) |
901 | { |
902 | canonbuf = getcanonname (nip, at, name); |
903 | if (canonbuf == NULL) |
904 | { |
905 | __resolv_context_enable_inet6 |
906 | (res_ctx, res_enable_inet6); |
907 | __resolv_context_put (res_ctx); |
908 | result = -EAI_MEMORY; |
909 | goto free_and_return; |
910 | } |
911 | canon = canonbuf; |
912 | } |
913 | status = NSS_STATUS_SUCCESS; |
914 | } |
915 | else |
916 | { |
917 | /* We can have different states for AF_INET and |
918 | AF_INET6. Try to find a useful one for both. */ |
919 | if (inet6_status == NSS_STATUS_TRYAGAIN) |
920 | status = NSS_STATUS_TRYAGAIN; |
921 | else if (status == NSS_STATUS_UNAVAIL |
922 | && inet6_status != NSS_STATUS_UNAVAIL) |
923 | status = inet6_status; |
924 | } |
925 | } |
926 | else |
927 | { |
928 | /* Could not locate any of the lookup functions. |
929 | The NSS lookup code does not consistently set |
930 | errno, so we need to supply our own error |
931 | code here. The root cause could either be a |
932 | resource allocation failure, or a missing |
933 | service function in the DSO (so it should not |
934 | be listed in /etc/nsswitch.conf). Assume the |
935 | former, and return EBUSY. */ |
936 | status = NSS_STATUS_UNAVAIL; |
937 | __set_h_errno (NETDB_INTERNAL); |
938 | __set_errno (EBUSY); |
939 | } |
940 | } |
941 | |
942 | if (nss_next_action (nip, status) == NSS_ACTION_RETURN) |
943 | break; |
944 | |
945 | if (nip->next == NULL) |
946 | no_more = -1; |
947 | else |
948 | nip = nip->next; |
949 | } |
950 | |
951 | __resolv_context_enable_inet6 (res_ctx, res_enable_inet6); |
952 | __resolv_context_put (res_ctx); |
953 | |
954 | /* If we have a failure which sets errno, report it using |
955 | EAI_SYSTEM. */ |
956 | if ((status == NSS_STATUS_TRYAGAIN || status == NSS_STATUS_UNAVAIL) |
957 | && h_errno == NETDB_INTERNAL) |
958 | { |
959 | result = -EAI_SYSTEM; |
960 | goto free_and_return; |
961 | } |
962 | |
963 | if (no_data != 0 && no_inet6_data != 0) |
964 | { |
965 | /* If both requests timed out report this. */ |
966 | if (no_data == EAI_AGAIN && no_inet6_data == EAI_AGAIN) |
967 | result = -EAI_AGAIN; |
968 | else |
969 | /* We made requests but they turned out no data. The name |
970 | is known, though. */ |
971 | result = -EAI_NODATA; |
972 | |
973 | goto free_and_return; |
974 | } |
975 | } |
976 | |
977 | process_list: |
978 | if (at->family == AF_UNSPEC) |
979 | { |
980 | result = -EAI_NONAME; |
981 | goto free_and_return; |
982 | } |
983 | } |
984 | else |
985 | { |
986 | struct gaih_addrtuple *atr; |
987 | atr = at = alloca_account (sizeof (struct gaih_addrtuple), alloca_used); |
988 | memset (at, '\0', sizeof (struct gaih_addrtuple)); |
989 | |
990 | if (req->ai_family == AF_UNSPEC) |
991 | { |
992 | at->next = __alloca (sizeof (struct gaih_addrtuple)); |
993 | memset (at->next, '\0', sizeof (struct gaih_addrtuple)); |
994 | } |
995 | |
996 | if (req->ai_family == AF_UNSPEC || req->ai_family == AF_INET6) |
997 | { |
998 | at->family = AF_INET6; |
999 | if ((req->ai_flags & AI_PASSIVE) == 0) |
1000 | memcpy (at->addr, &in6addr_loopback, sizeof (struct in6_addr)); |
1001 | atr = at->next; |
1002 | } |
1003 | |
1004 | if (req->ai_family == AF_UNSPEC || req->ai_family == AF_INET) |
1005 | { |
1006 | atr->family = AF_INET; |
1007 | if ((req->ai_flags & AI_PASSIVE) == 0) |
1008 | atr->addr[0] = htonl (INADDR_LOOPBACK); |
1009 | } |
1010 | } |
1011 | |
1012 | { |
1013 | struct gaih_servtuple *st2; |
1014 | struct gaih_addrtuple *at2 = at; |
1015 | size_t socklen; |
1016 | sa_family_t family; |
1017 | |
1018 | /* |
1019 | buffer is the size of an unformatted IPv6 address in printable format. |
1020 | */ |
1021 | while (at2 != NULL) |
1022 | { |
1023 | /* Only the first entry gets the canonical name. */ |
1024 | if (at2 == at && (req->ai_flags & AI_CANONNAME) != 0) |
1025 | { |
1026 | if (canon == NULL) |
1027 | /* If the canonical name cannot be determined, use |
1028 | the passed in string. */ |
1029 | canon = orig_name; |
1030 | |
1031 | #ifdef HAVE_LIBIDN |
1032 | if (req->ai_flags & AI_CANONIDN) |
1033 | { |
1034 | int idn_flags = 0; |
1035 | if (req->ai_flags & AI_IDN_ALLOW_UNASSIGNED) |
1036 | idn_flags |= IDNA_ALLOW_UNASSIGNED; |
1037 | if (req->ai_flags & AI_IDN_USE_STD3_ASCII_RULES) |
1038 | idn_flags |= IDNA_USE_STD3_ASCII_RULES; |
1039 | |
1040 | char *out; |
1041 | int rc = __idna_to_unicode_lzlz (canon, &out, idn_flags); |
1042 | if (rc != IDNA_SUCCESS) |
1043 | { |
1044 | if (rc == IDNA_MALLOC_ERROR) |
1045 | result = -EAI_MEMORY; |
1046 | else if (rc == IDNA_DLOPEN_ERROR) |
1047 | result = -EAI_SYSTEM; |
1048 | else |
1049 | result = -EAI_IDN_ENCODE; |
1050 | goto free_and_return; |
1051 | } |
1052 | /* In case the output string is the same as the input |
1053 | string no new string has been allocated and we |
1054 | make a copy. */ |
1055 | if (out == canon) |
1056 | goto make_copy; |
1057 | canon = out; |
1058 | } |
1059 | else |
1060 | #endif |
1061 | { |
1062 | #ifdef HAVE_LIBIDN |
1063 | make_copy: |
1064 | #endif |
1065 | if (canonbuf != NULL) |
1066 | /* We already allocated the string using malloc, but |
1067 | the buffer is now owned by canon. */ |
1068 | canonbuf = NULL; |
1069 | else |
1070 | { |
1071 | canon = __strdup (canon); |
1072 | if (canon == NULL) |
1073 | { |
1074 | result = -EAI_MEMORY; |
1075 | goto free_and_return; |
1076 | } |
1077 | } |
1078 | } |
1079 | } |
1080 | |
1081 | family = at2->family; |
1082 | if (family == AF_INET6) |
1083 | { |
1084 | socklen = sizeof (struct sockaddr_in6); |
1085 | |
1086 | /* If we looked up IPv4 mapped address discard them here if |
1087 | the caller isn't interested in all address and we have |
1088 | found at least one IPv6 address. */ |
1089 | if (got_ipv6 |
1090 | && (req->ai_flags & (AI_V4MAPPED|AI_ALL)) == AI_V4MAPPED |
1091 | && IN6_IS_ADDR_V4MAPPED (at2->addr)) |
1092 | goto ignore; |
1093 | } |
1094 | else |
1095 | socklen = sizeof (struct sockaddr_in); |
1096 | |
1097 | for (st2 = st; st2 != NULL; st2 = st2->next) |
1098 | { |
1099 | struct addrinfo *ai; |
1100 | ai = *pai = malloc (sizeof (struct addrinfo) + socklen); |
1101 | if (ai == NULL) |
1102 | { |
1103 | free ((char *) canon); |
1104 | result = -EAI_MEMORY; |
1105 | goto free_and_return; |
1106 | } |
1107 | |
1108 | ai->ai_flags = req->ai_flags; |
1109 | ai->ai_family = family; |
1110 | ai->ai_socktype = st2->socktype; |
1111 | ai->ai_protocol = st2->protocol; |
1112 | ai->ai_addrlen = socklen; |
1113 | ai->ai_addr = (void *) (ai + 1); |
1114 | |
1115 | /* We only add the canonical name once. */ |
1116 | ai->ai_canonname = (char *) canon; |
1117 | canon = NULL; |
1118 | |
1119 | #ifdef _HAVE_SA_LEN |
1120 | ai->ai_addr->sa_len = socklen; |
1121 | #endif /* _HAVE_SA_LEN */ |
1122 | ai->ai_addr->sa_family = family; |
1123 | |
1124 | /* In case of an allocation error the list must be NULL |
1125 | terminated. */ |
1126 | ai->ai_next = NULL; |
1127 | |
1128 | if (family == AF_INET6) |
1129 | { |
1130 | struct sockaddr_in6 *sin6p = |
1131 | (struct sockaddr_in6 *) ai->ai_addr; |
1132 | |
1133 | sin6p->sin6_port = st2->port; |
1134 | sin6p->sin6_flowinfo = 0; |
1135 | memcpy (&sin6p->sin6_addr, |
1136 | at2->addr, sizeof (struct in6_addr)); |
1137 | sin6p->sin6_scope_id = at2->scopeid; |
1138 | } |
1139 | else |
1140 | { |
1141 | struct sockaddr_in *sinp = |
1142 | (struct sockaddr_in *) ai->ai_addr; |
1143 | sinp->sin_port = st2->port; |
1144 | memcpy (&sinp->sin_addr, |
1145 | at2->addr, sizeof (struct in_addr)); |
1146 | memset (sinp->sin_zero, '\0', sizeof (sinp->sin_zero)); |
1147 | } |
1148 | |
1149 | pai = &(ai->ai_next); |
1150 | } |
1151 | |
1152 | ++*naddrs; |
1153 | |
1154 | ignore: |
1155 | at2 = at2->next; |
1156 | } |
1157 | } |
1158 | |
1159 | free_and_return: |
1160 | if (malloc_name) |
1161 | free ((char *) name); |
1162 | free (addrmem); |
1163 | free (canonbuf); |
1164 | |
1165 | return result; |
1166 | } |
1167 | |
1168 | |
1169 | struct sort_result |
1170 | { |
1171 | struct addrinfo *dest_addr; |
1172 | /* Using sockaddr_storage is for now overkill. We only support IPv4 |
1173 | and IPv6 so far. If this changes at some point we can adjust the |
1174 | type here. */ |
1175 | struct sockaddr_in6 source_addr; |
1176 | uint8_t source_addr_len; |
1177 | bool got_source_addr; |
1178 | uint8_t source_addr_flags; |
1179 | uint8_t prefixlen; |
1180 | uint32_t index; |
1181 | int32_t native; |
1182 | }; |
1183 | |
1184 | struct sort_result_combo |
1185 | { |
1186 | struct sort_result *results; |
1187 | int nresults; |
1188 | }; |
1189 | |
1190 | |
1191 | #if __BYTE_ORDER == __BIG_ENDIAN |
1192 | # define htonl_c(n) n |
1193 | #else |
1194 | # define htonl_c(n) __bswap_constant_32 (n) |
1195 | #endif |
1196 | |
1197 | static const struct scopeentry |
1198 | { |
1199 | union |
1200 | { |
1201 | char addr[4]; |
1202 | uint32_t addr32; |
1203 | }; |
1204 | uint32_t netmask; |
1205 | int32_t scope; |
1206 | } default_scopes[] = |
1207 | { |
1208 | /* Link-local addresses: scope 2. */ |
1209 | { { { 169, 254, 0, 0 } }, htonl_c (0xffff0000), 2 }, |
1210 | { { { 127, 0, 0, 0 } }, htonl_c (0xff000000), 2 }, |
1211 | /* Default: scope 14. */ |
1212 | { { { 0, 0, 0, 0 } }, htonl_c (0x00000000), 14 } |
1213 | }; |
1214 | |
1215 | /* The label table. */ |
1216 | static const struct scopeentry *scopes; |
1217 | |
1218 | |
1219 | static int |
1220 | get_scope (const struct sockaddr_in6 *in6) |
1221 | { |
1222 | int scope; |
1223 | if (in6->sin6_family == PF_INET6) |
1224 | { |
1225 | if (! IN6_IS_ADDR_MULTICAST (&in6->sin6_addr)) |
1226 | { |
1227 | if (IN6_IS_ADDR_LINKLOCAL (&in6->sin6_addr) |
1228 | /* RFC 4291 2.5.3 says that the loopback address is to be |
1229 | treated like a link-local address. */ |
1230 | || IN6_IS_ADDR_LOOPBACK (&in6->sin6_addr)) |
1231 | scope = 2; |
1232 | else if (IN6_IS_ADDR_SITELOCAL (&in6->sin6_addr)) |
1233 | scope = 5; |
1234 | else |
1235 | /* XXX Is this the correct default behavior? */ |
1236 | scope = 14; |
1237 | } |
1238 | else |
1239 | scope = in6->sin6_addr.s6_addr[1] & 0xf; |
1240 | } |
1241 | else if (in6->sin6_family == PF_INET) |
1242 | { |
1243 | const struct sockaddr_in *in = (const struct sockaddr_in *) in6; |
1244 | |
1245 | size_t cnt = 0; |
1246 | while (1) |
1247 | { |
1248 | if ((in->sin_addr.s_addr & scopes[cnt].netmask) |
1249 | == scopes[cnt].addr32) |
1250 | return scopes[cnt].scope; |
1251 | |
1252 | ++cnt; |
1253 | } |
1254 | /* NOTREACHED */ |
1255 | } |
1256 | else |
1257 | /* XXX What is a good default? */ |
1258 | scope = 15; |
1259 | |
1260 | return scope; |
1261 | } |
1262 | |
1263 | |
1264 | struct prefixentry |
1265 | { |
1266 | struct in6_addr prefix; |
1267 | unsigned int bits; |
1268 | int val; |
1269 | }; |
1270 | |
1271 | |
1272 | /* The label table. */ |
1273 | static const struct prefixentry *labels; |
1274 | |
1275 | /* Default labels. */ |
1276 | static const struct prefixentry default_labels[] = |
1277 | { |
1278 | /* See RFC 3484 for the details. */ |
1279 | { { .__in6_u |
1280 | = { .__u6_addr8 = { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, |
1281 | 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01 } } |
1282 | }, 128, 0 }, |
1283 | { { .__in6_u |
1284 | = { .__u6_addr8 = { 0x20, 0x02, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, |
1285 | 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 } } |
1286 | }, 16, 2 }, |
1287 | { { .__in6_u |
1288 | = { .__u6_addr8 = { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, |
1289 | 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 } } |
1290 | }, 96, 3 }, |
1291 | { { .__in6_u |
1292 | = { .__u6_addr8 = { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, |
1293 | 0x00, 0x00, 0xff, 0xff, 0x00, 0x00, 0x00, 0x00 } } |
1294 | }, 96, 4 }, |
1295 | /* The next two entries differ from RFC 3484. We need to treat |
1296 | IPv6 site-local addresses special because they are never NATed, |
1297 | unlike site-locale IPv4 addresses. If this would not happen, on |
1298 | machines which have only IPv4 and IPv6 site-local addresses, the |
1299 | sorting would prefer the IPv6 site-local addresses, causing |
1300 | unnecessary delays when trying to connect to a global IPv6 address |
1301 | through a site-local IPv6 address. */ |
1302 | { { .__in6_u |
1303 | = { .__u6_addr8 = { 0xfe, 0xc0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, |
1304 | 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 } } |
1305 | }, 10, 5 }, |
1306 | { { .__in6_u |
1307 | = { .__u6_addr8 = { 0xfc, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, |
1308 | 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 } } |
1309 | }, 7, 6 }, |
1310 | /* Additional rule for Teredo tunnels. */ |
1311 | { { .__in6_u |
1312 | = { .__u6_addr8 = { 0x20, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, |
1313 | 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 } } |
1314 | }, 32, 7 }, |
1315 | { { .__in6_u |
1316 | = { .__u6_addr8 = { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, |
1317 | 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 } } |
1318 | }, 0, 1 } |
1319 | }; |
1320 | |
1321 | |
1322 | /* The precedence table. */ |
1323 | static const struct prefixentry *precedence; |
1324 | |
1325 | /* The default precedences. */ |
1326 | static const struct prefixentry default_precedence[] = |
1327 | { |
1328 | /* See RFC 3484 for the details. */ |
1329 | { { .__in6_u |
1330 | = { .__u6_addr8 = { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, |
1331 | 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01 } } |
1332 | }, 128, 50 }, |
1333 | { { .__in6_u |
1334 | = { .__u6_addr8 = { 0x20, 0x02, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, |
1335 | 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 } } |
1336 | }, 16, 30 }, |
1337 | { { .__in6_u |
1338 | = { .__u6_addr8 = { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, |
1339 | 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 } } |
1340 | }, 96, 20 }, |
1341 | { { .__in6_u |
1342 | = { .__u6_addr8 = { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, |
1343 | 0x00, 0x00, 0xff, 0xff, 0x00, 0x00, 0x00, 0x00 } } |
1344 | }, 96, 10 }, |
1345 | { { .__in6_u |
1346 | = { .__u6_addr8 = { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, |
1347 | 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 } } |
1348 | }, 0, 40 } |
1349 | }; |
1350 | |
1351 | |
1352 | static int |
1353 | match_prefix (const struct sockaddr_in6 *in6, |
1354 | const struct prefixentry *list, int default_val) |
1355 | { |
1356 | int idx; |
1357 | struct sockaddr_in6 in6_mem; |
1358 | |
1359 | if (in6->sin6_family == PF_INET) |
1360 | { |
1361 | const struct sockaddr_in *in = (const struct sockaddr_in *) in6; |
1362 | |
1363 | /* Construct a V4-to-6 mapped address. */ |
1364 | in6_mem.sin6_family = PF_INET6; |
1365 | in6_mem.sin6_port = in->sin_port; |
1366 | in6_mem.sin6_flowinfo = 0; |
1367 | memset (&in6_mem.sin6_addr, '\0', sizeof (in6_mem.sin6_addr)); |
1368 | in6_mem.sin6_addr.s6_addr16[5] = 0xffff; |
1369 | in6_mem.sin6_addr.s6_addr32[3] = in->sin_addr.s_addr; |
1370 | in6_mem.sin6_scope_id = 0; |
1371 | |
1372 | in6 = &in6_mem; |
1373 | } |
1374 | else if (in6->sin6_family != PF_INET6) |
1375 | return default_val; |
1376 | |
1377 | for (idx = 0; ; ++idx) |
1378 | { |
1379 | unsigned int bits = list[idx].bits; |
1380 | const uint8_t *mask = list[idx].prefix.s6_addr; |
1381 | const uint8_t *val = in6->sin6_addr.s6_addr; |
1382 | |
1383 | while (bits >= 8) |
1384 | { |
1385 | if (*mask != *val) |
1386 | break; |
1387 | |
1388 | ++mask; |
1389 | ++val; |
1390 | bits -= 8; |
1391 | } |
1392 | |
1393 | if (bits < 8) |
1394 | { |
1395 | if ((*mask & (0xff00 >> bits)) == (*val & (0xff00 >> bits))) |
1396 | /* Match! */ |
1397 | break; |
1398 | } |
1399 | } |
1400 | |
1401 | return list[idx].val; |
1402 | } |
1403 | |
1404 | |
1405 | static int |
1406 | get_label (const struct sockaddr_in6 *in6) |
1407 | { |
1408 | /* XXX What is a good default value? */ |
1409 | return match_prefix (in6, labels, INT_MAX); |
1410 | } |
1411 | |
1412 | |
1413 | static int |
1414 | get_precedence (const struct sockaddr_in6 *in6) |
1415 | { |
1416 | /* XXX What is a good default value? */ |
1417 | return match_prefix (in6, precedence, 0); |
1418 | } |
1419 | |
1420 | |
1421 | /* Find last bit set in a word. */ |
1422 | static int |
1423 | fls (uint32_t a) |
1424 | { |
1425 | uint32_t mask; |
1426 | int n; |
1427 | for (n = 0, mask = 1 << 31; n < 32; mask >>= 1, ++n) |
1428 | if ((a & mask) != 0) |
1429 | break; |
1430 | return n; |
1431 | } |
1432 | |
1433 | |
1434 | static int |
1435 | rfc3484_sort (const void *p1, const void *p2, void *arg) |
1436 | { |
1437 | const size_t idx1 = *(const size_t *) p1; |
1438 | const size_t idx2 = *(const size_t *) p2; |
1439 | struct sort_result_combo *src = (struct sort_result_combo *) arg; |
1440 | struct sort_result *a1 = &src->results[idx1]; |
1441 | struct sort_result *a2 = &src->results[idx2]; |
1442 | |
1443 | /* Rule 1: Avoid unusable destinations. |
1444 | We have the got_source_addr flag set if the destination is reachable. */ |
1445 | if (a1->got_source_addr && ! a2->got_source_addr) |
1446 | return -1; |
1447 | if (! a1->got_source_addr && a2->got_source_addr) |
1448 | return 1; |
1449 | |
1450 | |
1451 | /* Rule 2: Prefer matching scope. Only interesting if both |
1452 | destination addresses are IPv6. */ |
1453 | int a1_dst_scope |
1454 | = get_scope ((struct sockaddr_in6 *) a1->dest_addr->ai_addr); |
1455 | |
1456 | int a2_dst_scope |
1457 | = get_scope ((struct sockaddr_in6 *) a2->dest_addr->ai_addr); |
1458 | |
1459 | if (a1->got_source_addr) |
1460 | { |
1461 | int a1_src_scope = get_scope (&a1->source_addr); |
1462 | int a2_src_scope = get_scope (&a2->source_addr); |
1463 | |
1464 | if (a1_dst_scope == a1_src_scope && a2_dst_scope != a2_src_scope) |
1465 | return -1; |
1466 | if (a1_dst_scope != a1_src_scope && a2_dst_scope == a2_src_scope) |
1467 | return 1; |
1468 | } |
1469 | |
1470 | |
1471 | /* Rule 3: Avoid deprecated addresses. */ |
1472 | if (a1->got_source_addr) |
1473 | { |
1474 | if (!(a1->source_addr_flags & in6ai_deprecated) |
1475 | && (a2->source_addr_flags & in6ai_deprecated)) |
1476 | return -1; |
1477 | if ((a1->source_addr_flags & in6ai_deprecated) |
1478 | && !(a2->source_addr_flags & in6ai_deprecated)) |
1479 | return 1; |
1480 | } |
1481 | |
1482 | /* Rule 4: Prefer home addresses. */ |
1483 | if (a1->got_source_addr) |
1484 | { |
1485 | if (!(a1->source_addr_flags & in6ai_homeaddress) |
1486 | && (a2->source_addr_flags & in6ai_homeaddress)) |
1487 | return 1; |
1488 | if ((a1->source_addr_flags & in6ai_homeaddress) |
1489 | && !(a2->source_addr_flags & in6ai_homeaddress)) |
1490 | return -1; |
1491 | } |
1492 | |
1493 | /* Rule 5: Prefer matching label. */ |
1494 | if (a1->got_source_addr) |
1495 | { |
1496 | int a1_dst_label |
1497 | = get_label ((struct sockaddr_in6 *) a1->dest_addr->ai_addr); |
1498 | int a1_src_label = get_label (&a1->source_addr); |
1499 | |
1500 | int a2_dst_label |
1501 | = get_label ((struct sockaddr_in6 *) a2->dest_addr->ai_addr); |
1502 | int a2_src_label = get_label (&a2->source_addr); |
1503 | |
1504 | if (a1_dst_label == a1_src_label && a2_dst_label != a2_src_label) |
1505 | return -1; |
1506 | if (a1_dst_label != a1_src_label && a2_dst_label == a2_src_label) |
1507 | return 1; |
1508 | } |
1509 | |
1510 | |
1511 | /* Rule 6: Prefer higher precedence. */ |
1512 | int a1_prec |
1513 | = get_precedence ((struct sockaddr_in6 *) a1->dest_addr->ai_addr); |
1514 | int a2_prec |
1515 | = get_precedence ((struct sockaddr_in6 *) a2->dest_addr->ai_addr); |
1516 | |
1517 | if (a1_prec > a2_prec) |
1518 | return -1; |
1519 | if (a1_prec < a2_prec) |
1520 | return 1; |
1521 | |
1522 | |
1523 | /* Rule 7: Prefer native transport. */ |
1524 | if (a1->got_source_addr) |
1525 | { |
1526 | /* The same interface index means the same interface which means |
1527 | there is no difference in transport. This should catch many |
1528 | (most?) cases. */ |
1529 | if (a1->index != a2->index) |
1530 | { |
1531 | int a1_native = a1->native; |
1532 | int a2_native = a2->native; |
1533 | |
1534 | if (a1_native == -1 || a2_native == -1) |
1535 | { |
1536 | uint32_t a1_index; |
1537 | if (a1_native == -1) |
1538 | { |
1539 | /* If we do not have the information use 'native' as |
1540 | the default. */ |
1541 | a1_native = 0; |
1542 | a1_index = a1->index; |
1543 | } |
1544 | else |
1545 | a1_index = 0xffffffffu; |
1546 | |
1547 | uint32_t a2_index; |
1548 | if (a2_native == -1) |
1549 | { |
1550 | /* If we do not have the information use 'native' as |
1551 | the default. */ |
1552 | a2_native = 0; |
1553 | a2_index = a2->index; |
1554 | } |
1555 | else |
1556 | a2_index = 0xffffffffu; |
1557 | |
1558 | __check_native (a1_index, &a1_native, a2_index, &a2_native); |
1559 | |
1560 | /* Fill in the results in all the records. */ |
1561 | for (int i = 0; i < src->nresults; ++i) |
1562 | if (a1_index != -1 && src->results[i].index == a1_index) |
1563 | { |
1564 | assert (src->results[i].native == -1 |
1565 | || src->results[i].native == a1_native); |
1566 | src->results[i].native = a1_native; |
1567 | } |
1568 | else if (a2_index != -1 && src->results[i].index == a2_index) |
1569 | { |
1570 | assert (src->results[i].native == -1 |
1571 | || src->results[i].native == a2_native); |
1572 | src->results[i].native = a2_native; |
1573 | } |
1574 | } |
1575 | |
1576 | if (a1_native && !a2_native) |
1577 | return -1; |
1578 | if (!a1_native && a2_native) |
1579 | return 1; |
1580 | } |
1581 | } |
1582 | |
1583 | |
1584 | /* Rule 8: Prefer smaller scope. */ |
1585 | if (a1_dst_scope < a2_dst_scope) |
1586 | return -1; |
1587 | if (a1_dst_scope > a2_dst_scope) |
1588 | return 1; |
1589 | |
1590 | |
1591 | /* Rule 9: Use longest matching prefix. */ |
1592 | if (a1->got_source_addr |
1593 | && a1->dest_addr->ai_family == a2->dest_addr->ai_family) |
1594 | { |
1595 | int bit1 = 0; |
1596 | int bit2 = 0; |
1597 | |
1598 | if (a1->dest_addr->ai_family == PF_INET) |
1599 | { |
1600 | assert (a1->source_addr.sin6_family == PF_INET); |
1601 | assert (a2->source_addr.sin6_family == PF_INET); |
1602 | |
1603 | /* Outside of subnets, as defined by the network masks, |
1604 | common address prefixes for IPv4 addresses make no sense. |
1605 | So, define a non-zero value only if source and |
1606 | destination address are on the same subnet. */ |
1607 | struct sockaddr_in *in1_dst |
1608 | = (struct sockaddr_in *) a1->dest_addr->ai_addr; |
1609 | in_addr_t in1_dst_addr = ntohl (in1_dst->sin_addr.s_addr); |
1610 | struct sockaddr_in *in1_src |
1611 | = (struct sockaddr_in *) &a1->source_addr; |
1612 | in_addr_t in1_src_addr = ntohl (in1_src->sin_addr.s_addr); |
1613 | in_addr_t netmask1 = 0xffffffffu << (32 - a1->prefixlen); |
1614 | |
1615 | if ((in1_src_addr & netmask1) == (in1_dst_addr & netmask1)) |
1616 | bit1 = fls (in1_dst_addr ^ in1_src_addr); |
1617 | |
1618 | struct sockaddr_in *in2_dst |
1619 | = (struct sockaddr_in *) a2->dest_addr->ai_addr; |
1620 | in_addr_t in2_dst_addr = ntohl (in2_dst->sin_addr.s_addr); |
1621 | struct sockaddr_in *in2_src |
1622 | = (struct sockaddr_in *) &a2->source_addr; |
1623 | in_addr_t in2_src_addr = ntohl (in2_src->sin_addr.s_addr); |
1624 | in_addr_t netmask2 = 0xffffffffu << (32 - a2->prefixlen); |
1625 | |
1626 | if ((in2_src_addr & netmask2) == (in2_dst_addr & netmask2)) |
1627 | bit2 = fls (in2_dst_addr ^ in2_src_addr); |
1628 | } |
1629 | else if (a1->dest_addr->ai_family == PF_INET6) |
1630 | { |
1631 | assert (a1->source_addr.sin6_family == PF_INET6); |
1632 | assert (a2->source_addr.sin6_family == PF_INET6); |
1633 | |
1634 | struct sockaddr_in6 *in1_dst; |
1635 | struct sockaddr_in6 *in1_src; |
1636 | struct sockaddr_in6 *in2_dst; |
1637 | struct sockaddr_in6 *in2_src; |
1638 | |
1639 | in1_dst = (struct sockaddr_in6 *) a1->dest_addr->ai_addr; |
1640 | in1_src = (struct sockaddr_in6 *) &a1->source_addr; |
1641 | in2_dst = (struct sockaddr_in6 *) a2->dest_addr->ai_addr; |
1642 | in2_src = (struct sockaddr_in6 *) &a2->source_addr; |
1643 | |
1644 | int i; |
1645 | for (i = 0; i < 4; ++i) |
1646 | if (in1_dst->sin6_addr.s6_addr32[i] |
1647 | != in1_src->sin6_addr.s6_addr32[i] |
1648 | || (in2_dst->sin6_addr.s6_addr32[i] |
1649 | != in2_src->sin6_addr.s6_addr32[i])) |
1650 | break; |
1651 | |
1652 | if (i < 4) |
1653 | { |
1654 | bit1 = fls (ntohl (in1_dst->sin6_addr.s6_addr32[i] |
1655 | ^ in1_src->sin6_addr.s6_addr32[i])); |
1656 | bit2 = fls (ntohl (in2_dst->sin6_addr.s6_addr32[i] |
1657 | ^ in2_src->sin6_addr.s6_addr32[i])); |
1658 | } |
1659 | } |
1660 | |
1661 | if (bit1 > bit2) |
1662 | return -1; |
1663 | if (bit1 < bit2) |
1664 | return 1; |
1665 | } |
1666 | |
1667 | |
1668 | /* Rule 10: Otherwise, leave the order unchanged. To ensure this |
1669 | compare with the value indicating the order in which the entries |
1670 | have been received from the services. NB: no two entries can have |
1671 | the same order so the test will never return zero. */ |
1672 | return idx1 < idx2 ? -1 : 1; |
1673 | } |
1674 | |
1675 | |
1676 | static int |
1677 | in6aicmp (const void *p1, const void *p2) |
1678 | { |
1679 | struct in6addrinfo *a1 = (struct in6addrinfo *) p1; |
1680 | struct in6addrinfo *a2 = (struct in6addrinfo *) p2; |
1681 | |
1682 | return memcmp (a1->addr, a2->addr, sizeof (a1->addr)); |
1683 | } |
1684 | |
1685 | |
1686 | /* Name of the config file for RFC 3484 sorting (for now). */ |
1687 | #define GAICONF_FNAME "/etc/gai.conf" |
1688 | |
1689 | |
1690 | /* Non-zero if we are supposed to reload the config file automatically |
1691 | whenever it changed. */ |
1692 | static int gaiconf_reload_flag; |
1693 | |
1694 | /* Non-zero if gaiconf_reload_flag was ever set to true. */ |
1695 | static int gaiconf_reload_flag_ever_set; |
1696 | |
1697 | /* Last modification time. */ |
1698 | #ifdef _STATBUF_ST_NSEC |
1699 | |
1700 | static struct timespec gaiconf_mtime; |
1701 | |
1702 | static inline void |
1703 | save_gaiconf_mtime (const struct stat64 *st) |
1704 | { |
1705 | gaiconf_mtime = st->st_mtim; |
1706 | } |
1707 | |
1708 | static inline bool |
1709 | check_gaiconf_mtime (const struct stat64 *st) |
1710 | { |
1711 | return (st->st_mtim.tv_sec == gaiconf_mtime.tv_sec |
1712 | && st->st_mtim.tv_nsec == gaiconf_mtime.tv_nsec); |
1713 | } |
1714 | |
1715 | #else |
1716 | |
1717 | static time_t gaiconf_mtime; |
1718 | |
1719 | static inline void |
1720 | save_gaiconf_mtime (const struct stat64 *st) |
1721 | { |
1722 | gaiconf_mtime = st->st_mtime; |
1723 | } |
1724 | |
1725 | static inline bool |
1726 | check_gaiconf_mtime (const struct stat64 *st) |
1727 | { |
1728 | return st->st_mtime == gaiconf_mtime; |
1729 | } |
1730 | |
1731 | #endif |
1732 | |
1733 | |
1734 | libc_freeres_fn(fini) |
1735 | { |
1736 | if (labels != default_labels) |
1737 | { |
1738 | const struct prefixentry *old = labels; |
1739 | labels = default_labels; |
1740 | free ((void *) old); |
1741 | } |
1742 | |
1743 | if (precedence != default_precedence) |
1744 | { |
1745 | const struct prefixentry *old = precedence; |
1746 | precedence = default_precedence; |
1747 | free ((void *) old); |
1748 | } |
1749 | |
1750 | if (scopes != default_scopes) |
1751 | { |
1752 | const struct scopeentry *old = scopes; |
1753 | scopes = default_scopes; |
1754 | free ((void *) old); |
1755 | } |
1756 | } |
1757 | |
1758 | |
1759 | struct prefixlist |
1760 | { |
1761 | struct prefixentry entry; |
1762 | struct prefixlist *next; |
1763 | }; |
1764 | |
1765 | |
1766 | struct scopelist |
1767 | { |
1768 | struct scopeentry entry; |
1769 | struct scopelist *next; |
1770 | }; |
1771 | |
1772 | |
1773 | static void |
1774 | free_prefixlist (struct prefixlist *list) |
1775 | { |
1776 | while (list != NULL) |
1777 | { |
1778 | struct prefixlist *oldp = list; |
1779 | list = list->next; |
1780 | free (oldp); |
1781 | } |
1782 | } |
1783 | |
1784 | |
1785 | static void |
1786 | free_scopelist (struct scopelist *list) |
1787 | { |
1788 | while (list != NULL) |
1789 | { |
1790 | struct scopelist *oldp = list; |
1791 | list = list->next; |
1792 | free (oldp); |
1793 | } |
1794 | } |
1795 | |
1796 | |
1797 | static int |
1798 | prefixcmp (const void *p1, const void *p2) |
1799 | { |
1800 | const struct prefixentry *e1 = (const struct prefixentry *) p1; |
1801 | const struct prefixentry *e2 = (const struct prefixentry *) p2; |
1802 | |
1803 | if (e1->bits < e2->bits) |
1804 | return 1; |
1805 | if (e1->bits == e2->bits) |
1806 | return 0; |
1807 | return -1; |
1808 | } |
1809 | |
1810 | |
1811 | static int |
1812 | scopecmp (const void *p1, const void *p2) |
1813 | { |
1814 | const struct scopeentry *e1 = (const struct scopeentry *) p1; |
1815 | const struct scopeentry *e2 = (const struct scopeentry *) p2; |
1816 | |
1817 | if (e1->netmask > e2->netmask) |
1818 | return -1; |
1819 | if (e1->netmask == e2->netmask) |
1820 | return 0; |
1821 | return 1; |
1822 | } |
1823 | |
1824 | |
1825 | static void |
1826 | gaiconf_init (void) |
1827 | { |
1828 | struct prefixlist *labellist = NULL; |
1829 | size_t nlabellist = 0; |
1830 | bool labellist_nullbits = false; |
1831 | struct prefixlist *precedencelist = NULL; |
1832 | size_t nprecedencelist = 0; |
1833 | bool precedencelist_nullbits = false; |
1834 | struct scopelist *scopelist = NULL; |
1835 | size_t nscopelist = 0; |
1836 | bool scopelist_nullbits = false; |
1837 | |
1838 | FILE *fp = fopen (GAICONF_FNAME, "rce" ); |
1839 | if (fp != NULL) |
1840 | { |
1841 | struct stat64 st; |
1842 | if (__fxstat64 (_STAT_VER, fileno (fp), &st) != 0) |
1843 | { |
1844 | fclose (fp); |
1845 | goto no_file; |
1846 | } |
1847 | |
1848 | char *line = NULL; |
1849 | size_t linelen = 0; |
1850 | |
1851 | __fsetlocking (fp, FSETLOCKING_BYCALLER); |
1852 | |
1853 | while (!feof_unlocked (fp)) |
1854 | { |
1855 | ssize_t n = __getline (&line, &linelen, fp); |
1856 | if (n <= 0) |
1857 | break; |
1858 | |
1859 | /* Handle comments. No escaping possible so this is easy. */ |
1860 | char *cp = strchr (line, '#'); |
1861 | if (cp != NULL) |
1862 | *cp = '\0'; |
1863 | |
1864 | cp = line; |
1865 | while (isspace (*cp)) |
1866 | ++cp; |
1867 | |
1868 | char *cmd = cp; |
1869 | while (*cp != '\0' && !isspace (*cp)) |
1870 | ++cp; |
1871 | size_t cmdlen = cp - cmd; |
1872 | |
1873 | if (*cp != '\0') |
1874 | *cp++ = '\0'; |
1875 | while (isspace (*cp)) |
1876 | ++cp; |
1877 | |
1878 | char *val1 = cp; |
1879 | while (*cp != '\0' && !isspace (*cp)) |
1880 | ++cp; |
1881 | size_t val1len = cp - cmd; |
1882 | |
1883 | /* We always need at least two values. */ |
1884 | if (val1len == 0) |
1885 | continue; |
1886 | |
1887 | if (*cp != '\0') |
1888 | *cp++ = '\0'; |
1889 | while (isspace (*cp)) |
1890 | ++cp; |
1891 | |
1892 | char *val2 = cp; |
1893 | while (*cp != '\0' && !isspace (*cp)) |
1894 | ++cp; |
1895 | |
1896 | /* Ignore the rest of the line. */ |
1897 | *cp = '\0'; |
1898 | |
1899 | struct prefixlist **listp; |
1900 | size_t *lenp; |
1901 | bool *nullbitsp; |
1902 | switch (cmdlen) |
1903 | { |
1904 | case 5: |
1905 | if (strcmp (cmd, "label" ) == 0) |
1906 | { |
1907 | struct in6_addr prefix; |
1908 | unsigned long int bits; |
1909 | unsigned long int val; |
1910 | char *endp; |
1911 | |
1912 | listp = &labellist; |
1913 | lenp = &nlabellist; |
1914 | nullbitsp = &labellist_nullbits; |
1915 | |
1916 | new_elem: |
1917 | bits = 128; |
1918 | __set_errno (0); |
1919 | cp = strchr (val1, '/'); |
1920 | if (cp != NULL) |
1921 | *cp++ = '\0'; |
1922 | if (inet_pton (AF_INET6, val1, &prefix) |
1923 | && (cp == NULL |
1924 | || (bits = strtoul (cp, &endp, 10)) != ULONG_MAX |
1925 | || errno != ERANGE) |
1926 | && *endp == '\0' |
1927 | && bits <= 128 |
1928 | && ((val = strtoul (val2, &endp, 10)) != ULONG_MAX |
1929 | || errno != ERANGE) |
1930 | && *endp == '\0' |
1931 | && val <= INT_MAX) |
1932 | { |
1933 | struct prefixlist *newp = malloc (sizeof (*newp)); |
1934 | if (newp == NULL) |
1935 | { |
1936 | free (line); |
1937 | fclose (fp); |
1938 | goto no_file; |
1939 | } |
1940 | |
1941 | memcpy (&newp->entry.prefix, &prefix, sizeof (prefix)); |
1942 | newp->entry.bits = bits; |
1943 | newp->entry.val = val; |
1944 | newp->next = *listp; |
1945 | *listp = newp; |
1946 | ++*lenp; |
1947 | *nullbitsp |= bits == 0; |
1948 | } |
1949 | } |
1950 | break; |
1951 | |
1952 | case 6: |
1953 | if (strcmp (cmd, "reload" ) == 0) |
1954 | { |
1955 | gaiconf_reload_flag = strcmp (val1, "yes" ) == 0; |
1956 | if (gaiconf_reload_flag) |
1957 | gaiconf_reload_flag_ever_set = 1; |
1958 | } |
1959 | break; |
1960 | |
1961 | case 7: |
1962 | if (strcmp (cmd, "scopev4" ) == 0) |
1963 | { |
1964 | struct in6_addr prefix; |
1965 | unsigned long int bits; |
1966 | unsigned long int val; |
1967 | char *endp; |
1968 | |
1969 | bits = 32; |
1970 | __set_errno (0); |
1971 | cp = strchr (val1, '/'); |
1972 | if (cp != NULL) |
1973 | *cp++ = '\0'; |
1974 | if (inet_pton (AF_INET6, val1, &prefix)) |
1975 | { |
1976 | bits = 128; |
1977 | if (IN6_IS_ADDR_V4MAPPED (&prefix) |
1978 | && (cp == NULL |
1979 | || (bits = strtoul (cp, &endp, 10)) != ULONG_MAX |
1980 | || errno != ERANGE) |
1981 | && *endp == '\0' |
1982 | && bits >= 96 |
1983 | && bits <= 128 |
1984 | && ((val = strtoul (val2, &endp, 10)) != ULONG_MAX |
1985 | || errno != ERANGE) |
1986 | && *endp == '\0' |
1987 | && val <= INT_MAX) |
1988 | { |
1989 | struct scopelist *newp; |
1990 | new_scope: |
1991 | newp = malloc (sizeof (*newp)); |
1992 | if (newp == NULL) |
1993 | { |
1994 | free (line); |
1995 | fclose (fp); |
1996 | goto no_file; |
1997 | } |
1998 | |
1999 | newp->entry.netmask = htonl (bits != 96 |
2000 | ? (0xffffffff |
2001 | << (128 - bits)) |
2002 | : 0); |
2003 | newp->entry.addr32 = (prefix.s6_addr32[3] |
2004 | & newp->entry.netmask); |
2005 | newp->entry.scope = val; |
2006 | newp->next = scopelist; |
2007 | scopelist = newp; |
2008 | ++nscopelist; |
2009 | scopelist_nullbits |= bits == 96; |
2010 | } |
2011 | } |
2012 | else if (inet_pton (AF_INET, val1, &prefix.s6_addr32[3]) |
2013 | && (cp == NULL |
2014 | || (bits = strtoul (cp, &endp, 10)) != ULONG_MAX |
2015 | || errno != ERANGE) |
2016 | && *endp == '\0' |
2017 | && bits <= 32 |
2018 | && ((val = strtoul (val2, &endp, 10)) != ULONG_MAX |
2019 | || errno != ERANGE) |
2020 | && *endp == '\0' |
2021 | && val <= INT_MAX) |
2022 | { |
2023 | bits += 96; |
2024 | goto new_scope; |
2025 | } |
2026 | } |
2027 | break; |
2028 | |
2029 | case 10: |
2030 | if (strcmp (cmd, "precedence" ) == 0) |
2031 | { |
2032 | listp = &precedencelist; |
2033 | lenp = &nprecedencelist; |
2034 | nullbitsp = &precedencelist_nullbits; |
2035 | goto new_elem; |
2036 | } |
2037 | break; |
2038 | } |
2039 | } |
2040 | |
2041 | free (line); |
2042 | |
2043 | fclose (fp); |
2044 | |
2045 | /* Create the array for the labels. */ |
2046 | struct prefixentry *new_labels; |
2047 | if (nlabellist > 0) |
2048 | { |
2049 | if (!labellist_nullbits) |
2050 | ++nlabellist; |
2051 | new_labels = malloc (nlabellist * sizeof (*new_labels)); |
2052 | if (new_labels == NULL) |
2053 | goto no_file; |
2054 | |
2055 | int i = nlabellist; |
2056 | if (!labellist_nullbits) |
2057 | { |
2058 | --i; |
2059 | memset (&new_labels[i].prefix, '\0', sizeof (struct in6_addr)); |
2060 | new_labels[i].bits = 0; |
2061 | new_labels[i].val = 1; |
2062 | } |
2063 | |
2064 | struct prefixlist *l = labellist; |
2065 | while (i-- > 0) |
2066 | { |
2067 | new_labels[i] = l->entry; |
2068 | l = l->next; |
2069 | } |
2070 | free_prefixlist (labellist); |
2071 | |
2072 | /* Sort the entries so that the most specific ones are at |
2073 | the beginning. */ |
2074 | qsort (new_labels, nlabellist, sizeof (*new_labels), prefixcmp); |
2075 | } |
2076 | else |
2077 | new_labels = (struct prefixentry *) default_labels; |
2078 | |
2079 | struct prefixentry *new_precedence; |
2080 | if (nprecedencelist > 0) |
2081 | { |
2082 | if (!precedencelist_nullbits) |
2083 | ++nprecedencelist; |
2084 | new_precedence = malloc (nprecedencelist * sizeof (*new_precedence)); |
2085 | if (new_precedence == NULL) |
2086 | { |
2087 | if (new_labels != default_labels) |
2088 | free (new_labels); |
2089 | goto no_file; |
2090 | } |
2091 | |
2092 | int i = nprecedencelist; |
2093 | if (!precedencelist_nullbits) |
2094 | { |
2095 | --i; |
2096 | memset (&new_precedence[i].prefix, '\0', |
2097 | sizeof (struct in6_addr)); |
2098 | new_precedence[i].bits = 0; |
2099 | new_precedence[i].val = 40; |
2100 | } |
2101 | |
2102 | struct prefixlist *l = precedencelist; |
2103 | while (i-- > 0) |
2104 | { |
2105 | new_precedence[i] = l->entry; |
2106 | l = l->next; |
2107 | } |
2108 | free_prefixlist (precedencelist); |
2109 | |
2110 | /* Sort the entries so that the most specific ones are at |
2111 | the beginning. */ |
2112 | qsort (new_precedence, nprecedencelist, sizeof (*new_precedence), |
2113 | prefixcmp); |
2114 | } |
2115 | else |
2116 | new_precedence = (struct prefixentry *) default_precedence; |
2117 | |
2118 | struct scopeentry *new_scopes; |
2119 | if (nscopelist > 0) |
2120 | { |
2121 | if (!scopelist_nullbits) |
2122 | ++nscopelist; |
2123 | new_scopes = malloc (nscopelist * sizeof (*new_scopes)); |
2124 | if (new_scopes == NULL) |
2125 | { |
2126 | if (new_labels != default_labels) |
2127 | free (new_labels); |
2128 | if (new_precedence != default_precedence) |
2129 | free (new_precedence); |
2130 | goto no_file; |
2131 | } |
2132 | |
2133 | int i = nscopelist; |
2134 | if (!scopelist_nullbits) |
2135 | { |
2136 | --i; |
2137 | new_scopes[i].addr32 = 0; |
2138 | new_scopes[i].netmask = 0; |
2139 | new_scopes[i].scope = 14; |
2140 | } |
2141 | |
2142 | struct scopelist *l = scopelist; |
2143 | while (i-- > 0) |
2144 | { |
2145 | new_scopes[i] = l->entry; |
2146 | l = l->next; |
2147 | } |
2148 | free_scopelist (scopelist); |
2149 | |
2150 | /* Sort the entries so that the most specific ones are at |
2151 | the beginning. */ |
2152 | qsort (new_scopes, nscopelist, sizeof (*new_scopes), |
2153 | scopecmp); |
2154 | } |
2155 | else |
2156 | new_scopes = (struct scopeentry *) default_scopes; |
2157 | |
2158 | /* Now we are ready to replace the values. */ |
2159 | const struct prefixentry *old = labels; |
2160 | labels = new_labels; |
2161 | if (old != default_labels) |
2162 | free ((void *) old); |
2163 | |
2164 | old = precedence; |
2165 | precedence = new_precedence; |
2166 | if (old != default_precedence) |
2167 | free ((void *) old); |
2168 | |
2169 | const struct scopeentry *oldscope = scopes; |
2170 | scopes = new_scopes; |
2171 | if (oldscope != default_scopes) |
2172 | free ((void *) oldscope); |
2173 | |
2174 | save_gaiconf_mtime (&st); |
2175 | } |
2176 | else |
2177 | { |
2178 | no_file: |
2179 | free_prefixlist (labellist); |
2180 | free_prefixlist (precedencelist); |
2181 | free_scopelist (scopelist); |
2182 | |
2183 | /* If we previously read the file but it is gone now, free the |
2184 | old data and use the builtin one. Leave the reload flag |
2185 | alone. */ |
2186 | fini (); |
2187 | } |
2188 | } |
2189 | |
2190 | |
2191 | static void |
2192 | gaiconf_reload (void) |
2193 | { |
2194 | struct stat64 st; |
2195 | if (__xstat64 (_STAT_VER, GAICONF_FNAME, &st) != 0 |
2196 | || !check_gaiconf_mtime (&st)) |
2197 | gaiconf_init (); |
2198 | } |
2199 | |
2200 | |
2201 | int |
2202 | getaddrinfo (const char *name, const char *service, |
2203 | const struct addrinfo *hints, struct addrinfo **pai) |
2204 | { |
2205 | int i = 0, last_i = 0; |
2206 | int nresults = 0; |
2207 | struct addrinfo *p = NULL; |
2208 | struct gaih_service gaih_service, *pservice; |
2209 | struct addrinfo local_hints; |
2210 | |
2211 | if (name != NULL && name[0] == '*' && name[1] == 0) |
2212 | name = NULL; |
2213 | |
2214 | if (service != NULL && service[0] == '*' && service[1] == 0) |
2215 | service = NULL; |
2216 | |
2217 | if (name == NULL && service == NULL) |
2218 | return EAI_NONAME; |
2219 | |
2220 | if (hints == NULL) |
2221 | hints = &default_hints; |
2222 | |
2223 | if (hints->ai_flags |
2224 | & ~(AI_PASSIVE|AI_CANONNAME|AI_NUMERICHOST|AI_ADDRCONFIG|AI_V4MAPPED |
2225 | #ifdef HAVE_LIBIDN |
2226 | |AI_IDN|AI_CANONIDN|AI_IDN_ALLOW_UNASSIGNED |
2227 | |AI_IDN_USE_STD3_ASCII_RULES |
2228 | #endif |
2229 | |AI_NUMERICSERV|AI_ALL)) |
2230 | return EAI_BADFLAGS; |
2231 | |
2232 | if ((hints->ai_flags & AI_CANONNAME) && name == NULL) |
2233 | return EAI_BADFLAGS; |
2234 | |
2235 | struct in6addrinfo *in6ai = NULL; |
2236 | size_t in6ailen = 0; |
2237 | bool seen_ipv4 = false; |
2238 | bool seen_ipv6 = false; |
2239 | bool check_pf_called = false; |
2240 | |
2241 | if (hints->ai_flags & AI_ADDRCONFIG) |
2242 | { |
2243 | /* We might need information about what interfaces are available. |
2244 | Also determine whether we have IPv4 or IPv6 interfaces or both. We |
2245 | cannot cache the results since new interfaces could be added at |
2246 | any time. */ |
2247 | __check_pf (&seen_ipv4, &seen_ipv6, &in6ai, &in6ailen); |
2248 | check_pf_called = true; |
2249 | |
2250 | /* Now make a decision on what we return, if anything. */ |
2251 | if (hints->ai_family == PF_UNSPEC && (seen_ipv4 || seen_ipv6)) |
2252 | { |
2253 | /* If we haven't seen both IPv4 and IPv6 interfaces we can |
2254 | narrow down the search. */ |
2255 | if ((! seen_ipv4 || ! seen_ipv6) && (seen_ipv4 || seen_ipv6)) |
2256 | { |
2257 | local_hints = *hints; |
2258 | local_hints.ai_family = seen_ipv4 ? PF_INET : PF_INET6; |
2259 | hints = &local_hints; |
2260 | } |
2261 | } |
2262 | else if ((hints->ai_family == PF_INET && ! seen_ipv4) |
2263 | || (hints->ai_family == PF_INET6 && ! seen_ipv6)) |
2264 | { |
2265 | /* We cannot possibly return a valid answer. */ |
2266 | __free_in6ai (in6ai); |
2267 | return EAI_NONAME; |
2268 | } |
2269 | } |
2270 | |
2271 | if (service && service[0]) |
2272 | { |
2273 | char *c; |
2274 | gaih_service.name = service; |
2275 | gaih_service.num = strtoul (gaih_service.name, &c, 10); |
2276 | if (*c != '\0') |
2277 | { |
2278 | if (hints->ai_flags & AI_NUMERICSERV) |
2279 | { |
2280 | __free_in6ai (in6ai); |
2281 | return EAI_NONAME; |
2282 | } |
2283 | |
2284 | gaih_service.num = -1; |
2285 | } |
2286 | |
2287 | pservice = &gaih_service; |
2288 | } |
2289 | else |
2290 | pservice = NULL; |
2291 | |
2292 | struct addrinfo **end = &p; |
2293 | |
2294 | unsigned int naddrs = 0; |
2295 | if (hints->ai_family == AF_UNSPEC || hints->ai_family == AF_INET |
2296 | || hints->ai_family == AF_INET6) |
2297 | { |
2298 | struct scratch_buffer tmpbuf; |
2299 | scratch_buffer_init (&tmpbuf); |
2300 | last_i = gaih_inet (name, pservice, hints, end, &naddrs, &tmpbuf); |
2301 | scratch_buffer_free (&tmpbuf); |
2302 | |
2303 | if (last_i != 0) |
2304 | { |
2305 | freeaddrinfo (p); |
2306 | __free_in6ai (in6ai); |
2307 | |
2308 | return -last_i; |
2309 | } |
2310 | while (*end) |
2311 | { |
2312 | end = &((*end)->ai_next); |
2313 | ++nresults; |
2314 | } |
2315 | } |
2316 | else |
2317 | { |
2318 | __free_in6ai (in6ai); |
2319 | return EAI_FAMILY; |
2320 | } |
2321 | |
2322 | if (naddrs > 1) |
2323 | { |
2324 | /* Read the config file. */ |
2325 | __libc_once_define (static, once); |
2326 | __typeof (once) old_once = once; |
2327 | __libc_once (once, gaiconf_init); |
2328 | /* Sort results according to RFC 3484. */ |
2329 | struct sort_result *results; |
2330 | size_t *order; |
2331 | struct addrinfo *q; |
2332 | struct addrinfo *last = NULL; |
2333 | char *canonname = NULL; |
2334 | bool malloc_results; |
2335 | size_t alloc_size = nresults * (sizeof (*results) + sizeof (size_t)); |
2336 | |
2337 | malloc_results |
2338 | = !__libc_use_alloca (alloc_size); |
2339 | if (malloc_results) |
2340 | { |
2341 | results = malloc (alloc_size); |
2342 | if (results == NULL) |
2343 | { |
2344 | __free_in6ai (in6ai); |
2345 | return EAI_MEMORY; |
2346 | } |
2347 | } |
2348 | else |
2349 | results = alloca (alloc_size); |
2350 | order = (size_t *) (results + nresults); |
2351 | |
2352 | /* Now we definitely need the interface information. */ |
2353 | if (! check_pf_called) |
2354 | __check_pf (&seen_ipv4, &seen_ipv6, &in6ai, &in6ailen); |
2355 | |
2356 | /* If we have information about deprecated and temporary addresses |
2357 | sort the array now. */ |
2358 | if (in6ai != NULL) |
2359 | qsort (in6ai, in6ailen, sizeof (*in6ai), in6aicmp); |
2360 | |
2361 | int fd = -1; |
2362 | int af = AF_UNSPEC; |
2363 | |
2364 | for (i = 0, q = p; q != NULL; ++i, last = q, q = q->ai_next) |
2365 | { |
2366 | results[i].dest_addr = q; |
2367 | results[i].native = -1; |
2368 | order[i] = i; |
2369 | |
2370 | /* If we just looked up the address for a different |
2371 | protocol, reuse the result. */ |
2372 | if (last != NULL && last->ai_addrlen == q->ai_addrlen |
2373 | && memcmp (last->ai_addr, q->ai_addr, q->ai_addrlen) == 0) |
2374 | { |
2375 | memcpy (&results[i].source_addr, &results[i - 1].source_addr, |
2376 | results[i - 1].source_addr_len); |
2377 | results[i].source_addr_len = results[i - 1].source_addr_len; |
2378 | results[i].got_source_addr = results[i - 1].got_source_addr; |
2379 | results[i].source_addr_flags = results[i - 1].source_addr_flags; |
2380 | results[i].prefixlen = results[i - 1].prefixlen; |
2381 | results[i].index = results[i - 1].index; |
2382 | } |
2383 | else |
2384 | { |
2385 | results[i].got_source_addr = false; |
2386 | results[i].source_addr_flags = 0; |
2387 | results[i].prefixlen = 0; |
2388 | results[i].index = 0xffffffffu; |
2389 | |
2390 | /* We overwrite the type with SOCK_DGRAM since we do not |
2391 | want connect() to connect to the other side. If we |
2392 | cannot determine the source address remember this |
2393 | fact. */ |
2394 | if (fd == -1 || (af == AF_INET && q->ai_family == AF_INET6)) |
2395 | { |
2396 | if (fd != -1) |
2397 | close_retry: |
2398 | __close_nocancel_nostatus (fd); |
2399 | af = q->ai_family; |
2400 | fd = __socket (af, SOCK_DGRAM | SOCK_CLOEXEC, IPPROTO_IP); |
2401 | } |
2402 | else |
2403 | { |
2404 | /* Reset the connection. */ |
2405 | struct sockaddr sa = { .sa_family = AF_UNSPEC }; |
2406 | __connect (fd, &sa, sizeof (sa)); |
2407 | } |
2408 | |
2409 | socklen_t sl = sizeof (results[i].source_addr); |
2410 | if (fd != -1 |
2411 | && __connect (fd, q->ai_addr, q->ai_addrlen) == 0 |
2412 | && __getsockname (fd, |
2413 | (struct sockaddr *) &results[i].source_addr, |
2414 | &sl) == 0) |
2415 | { |
2416 | results[i].source_addr_len = sl; |
2417 | results[i].got_source_addr = true; |
2418 | |
2419 | if (in6ai != NULL) |
2420 | { |
2421 | /* See whether the source address is on the list of |
2422 | deprecated or temporary addresses. */ |
2423 | struct in6addrinfo tmp; |
2424 | |
2425 | if (q->ai_family == AF_INET && af == AF_INET) |
2426 | { |
2427 | struct sockaddr_in *sinp |
2428 | = (struct sockaddr_in *) &results[i].source_addr; |
2429 | tmp.addr[0] = 0; |
2430 | tmp.addr[1] = 0; |
2431 | tmp.addr[2] = htonl (0xffff); |
2432 | /* Special case for lo interface, the source address |
2433 | being possibly different than the interface |
2434 | address. */ |
2435 | if ((ntohl(sinp->sin_addr.s_addr) & 0xff000000) |
2436 | == 0x7f000000) |
2437 | tmp.addr[3] = htonl(0x7f000001); |
2438 | else |
2439 | tmp.addr[3] = sinp->sin_addr.s_addr; |
2440 | } |
2441 | else |
2442 | { |
2443 | struct sockaddr_in6 *sin6p |
2444 | = (struct sockaddr_in6 *) &results[i].source_addr; |
2445 | memcpy (tmp.addr, &sin6p->sin6_addr, IN6ADDRSZ); |
2446 | } |
2447 | |
2448 | struct in6addrinfo *found |
2449 | = bsearch (&tmp, in6ai, in6ailen, sizeof (*in6ai), |
2450 | in6aicmp); |
2451 | if (found != NULL) |
2452 | { |
2453 | results[i].source_addr_flags = found->flags; |
2454 | results[i].prefixlen = found->prefixlen; |
2455 | results[i].index = found->index; |
2456 | } |
2457 | } |
2458 | |
2459 | if (q->ai_family == AF_INET && af == AF_INET6) |
2460 | { |
2461 | /* We have to convert the address. The socket is |
2462 | IPv6 and the request is for IPv4. */ |
2463 | struct sockaddr_in6 *sin6 |
2464 | = (struct sockaddr_in6 *) &results[i].source_addr; |
2465 | struct sockaddr_in *sin |
2466 | = (struct sockaddr_in *) &results[i].source_addr; |
2467 | assert (IN6_IS_ADDR_V4MAPPED (sin6->sin6_addr.s6_addr32)); |
2468 | sin->sin_family = AF_INET; |
2469 | /* We do not have to initialize sin_port since this |
2470 | fields has the same position and size in the IPv6 |
2471 | structure. */ |
2472 | assert (offsetof (struct sockaddr_in, sin_port) |
2473 | == offsetof (struct sockaddr_in6, sin6_port)); |
2474 | assert (sizeof (sin->sin_port) |
2475 | == sizeof (sin6->sin6_port)); |
2476 | memcpy (&sin->sin_addr, |
2477 | &sin6->sin6_addr.s6_addr32[3], INADDRSZ); |
2478 | results[i].source_addr_len = sizeof (struct sockaddr_in); |
2479 | } |
2480 | } |
2481 | else if (errno == EAFNOSUPPORT && af == AF_INET6 |
2482 | && q->ai_family == AF_INET) |
2483 | /* This could mean IPv6 sockets are IPv6-only. */ |
2484 | goto close_retry; |
2485 | else |
2486 | /* Just make sure that if we have to process the same |
2487 | address again we do not copy any memory. */ |
2488 | results[i].source_addr_len = 0; |
2489 | } |
2490 | |
2491 | /* Remember the canonical name. */ |
2492 | if (q->ai_canonname != NULL) |
2493 | { |
2494 | assert (canonname == NULL); |
2495 | canonname = q->ai_canonname; |
2496 | q->ai_canonname = NULL; |
2497 | } |
2498 | } |
2499 | |
2500 | if (fd != -1) |
2501 | __close_nocancel_nostatus (fd); |
2502 | |
2503 | /* We got all the source addresses we can get, now sort using |
2504 | the information. */ |
2505 | struct sort_result_combo src |
2506 | = { .results = results, .nresults = nresults }; |
2507 | if (__glibc_unlikely (gaiconf_reload_flag_ever_set)) |
2508 | { |
2509 | __libc_lock_define_initialized (static, lock); |
2510 | |
2511 | __libc_lock_lock (lock); |
2512 | if (__libc_once_get (old_once) && gaiconf_reload_flag) |
2513 | gaiconf_reload (); |
2514 | __qsort_r (order, nresults, sizeof (order[0]), rfc3484_sort, &src); |
2515 | __libc_lock_unlock (lock); |
2516 | } |
2517 | else |
2518 | __qsort_r (order, nresults, sizeof (order[0]), rfc3484_sort, &src); |
2519 | |
2520 | /* Queue the results up as they come out of sorting. */ |
2521 | q = p = results[order[0]].dest_addr; |
2522 | for (i = 1; i < nresults; ++i) |
2523 | q = q->ai_next = results[order[i]].dest_addr; |
2524 | q->ai_next = NULL; |
2525 | |
2526 | /* Fill in the canonical name into the new first entry. */ |
2527 | p->ai_canonname = canonname; |
2528 | |
2529 | if (malloc_results) |
2530 | free (results); |
2531 | } |
2532 | |
2533 | __free_in6ai (in6ai); |
2534 | |
2535 | if (p) |
2536 | { |
2537 | *pai = p; |
2538 | return 0; |
2539 | } |
2540 | |
2541 | return last_i ? -last_i : EAI_NONAME; |
2542 | } |
2543 | libc_hidden_def (getaddrinfo) |
2544 | |
2545 | nss_interface_function (getaddrinfo) |
2546 | |
2547 | void |
2548 | freeaddrinfo (struct addrinfo *ai) |
2549 | { |
2550 | struct addrinfo *p; |
2551 | |
2552 | while (ai != NULL) |
2553 | { |
2554 | p = ai; |
2555 | ai = ai->ai_next; |
2556 | free (p->ai_canonname); |
2557 | free (p); |
2558 | } |
2559 | } |
2560 | libc_hidden_def (freeaddrinfo) |
2561 | |