/[svn]/ircd-hybrid-7.2/src/irc_getaddrinfo.c
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Contents of /ircd-hybrid-7.2/src/irc_getaddrinfo.c

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Revision 34 - (show annotations)
Sun Oct 2 21:05:51 2005 UTC (14 years ago) by lusky
File MIME type: text/x-chdr
File size: 14738 byte(s)
create 7.2 branch, we can move/rename it as needed.


1 /*
2 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. Neither the name of the project nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 */
29
30 #include "stdinc.h"
31
32 #include <stdarg.h>
33 #include "irc_getaddrinfo.h"
34 #include "ircd_defs.h"
35
36 /* $Id$ */
37
38 static const char in_addrany[] = { 0, 0, 0, 0 };
39 static const char in_loopback[] = { 127, 0, 0, 1 };
40 static const char in6_addrany[] = {
41 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
42 };
43 static const char in6_loopback[] = {
44 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1
45 };
46
47 static const struct afd {
48 int a_af;
49 int a_addrlen;
50 int a_socklen;
51 int a_off;
52 const char *a_addrany;
53 const char *a_loopback;
54 int a_scoped;
55 } afdl [] = {
56 #define N_INET6 0
57 #ifdef IPV6
58 {PF_INET6, sizeof(struct in6_addr),
59 sizeof(struct sockaddr_in6),
60 offsetof(struct sockaddr_in6, sin6_addr),
61 in6_addrany, in6_loopback, 1},
62 #endif
63 #define N_INET 1
64 {PF_INET, sizeof(struct in_addr),
65 sizeof(struct sockaddr_in),
66 offsetof(struct sockaddr_in, sin_addr),
67 in_addrany, in_loopback, 0},
68 {0, 0, 0, 0, NULL, NULL, 0},
69 };
70
71 struct explore {
72 int e_af;
73 int e_socktype;
74 int e_protocol;
75 const char *e_protostr;
76 int e_wild;
77 #define WILD_AF(ex) ((ex)->e_wild & 0x01)
78 #define WILD_SOCKTYPE(ex) ((ex)->e_wild & 0x02)
79 #define WILD_PROTOCOL(ex) ((ex)->e_wild & 0x04)
80 };
81
82 static const struct explore explore[] = {
83 #ifdef IPV6
84 { PF_INET6, SOCK_DGRAM, IPPROTO_UDP, "udp", 0x07 },
85 { PF_INET6, SOCK_STREAM, IPPROTO_TCP, "tcp", 0x07 },
86 { PF_INET6, SOCK_RAW, ANY, NULL, 0x05 },
87 #endif
88 { PF_INET, SOCK_DGRAM, IPPROTO_UDP, "udp", 0x07 },
89 { PF_INET, SOCK_STREAM, IPPROTO_TCP, "tcp", 0x07 },
90 { PF_INET, SOCK_RAW, ANY, NULL, 0x05 },
91 { PF_UNSPEC, SOCK_DGRAM, IPPROTO_UDP, "udp", 0x07 },
92 { PF_UNSPEC, SOCK_STREAM, IPPROTO_TCP, "tcp", 0x07 },
93 { PF_UNSPEC, SOCK_RAW, ANY, NULL, 0x05 },
94 { -1, 0, 0, NULL, 0 },
95 };
96
97 #define PTON_MAX 16
98
99 static int str_isnumber(const char *);
100 static int explore_null(const struct addrinfo *,
101 const char *, struct addrinfo **);
102 static int explore_numeric(const struct addrinfo *, const char *,
103 const char *, struct addrinfo **);
104 static struct addrinfo *get_ai(const struct addrinfo *,
105 const struct afd *, const char *);
106 static int get_portmatch(const struct addrinfo *, const char *);
107 static int get_port(struct addrinfo *, const char *, int);
108 static const struct afd *find_afd(int);
109 #if 0
110 /* We will need this should we ever want gai_strerror() */
111 static char *ai_errlist[] = {
112 "Success",
113 "Address family for hostname not supported", /* EAI_ADDRFAMILY */
114 "Temporary failure in name resolution", /* EAI_AGAIN */
115 "Invalid value for ai_flags", /* EAI_BADFLAGS */
116 "Non-recoverable failure in name resolution", /* EAI_FAIL */
117 "ai_family not supported", /* EAI_FAMILY */
118 "Memory allocation failure", /* EAI_MEMORY */
119 "No address associated with hostname", /* EAI_NODATA */
120 "hostname nor servname provided, or not known", /* EAI_NONAME */
121 "servname not supported for ai_socktype", /* EAI_SERVICE */
122 "ai_socktype not supported", /* EAI_SOCKTYPE */
123 "System error returned in errno", /* EAI_SYSTEM */
124 "Invalid value for hints", /* EAI_BADHINTS */
125 "Resolved protocol is unknown", /* EAI_PROTOCOL */
126 "Unknown error", /* EAI_MAX */
127 };
128 #endif
129 /* XXX macros that make external reference is BAD. */
130
131 #define GET_AI(ai, afd, addr) \
132 do { \
133 /* external reference: pai, error, and label free */ \
134 (ai) = get_ai(pai, (afd), (addr)); \
135 if ((ai) == NULL) { \
136 error = EAI_MEMORY; \
137 goto free; \
138 } \
139 } while (/*CONSTCOND*/0)
140
141 #define GET_PORT(ai, serv) \
142 do { \
143 /* external reference: error and label free */ \
144 error = get_port((ai), (serv), 0); \
145 if (error != 0) \
146 goto free; \
147 } while (/*CONSTCOND*/0)
148
149 #define ERR(err) \
150 do { \
151 /* external reference: error, and label bad */ \
152 error = (err); \
153 goto bad; \
154 /*NOTREACHED*/ \
155 } while (/*CONSTCOND*/0)
156
157 #define MATCH_FAMILY(x, y, w) \
158 ((x) == (y) || (/*CONSTCOND*/(w) && ((x) == PF_UNSPEC || (y) == PF_UNSPEC)))
159 #define MATCH(x, y, w) \
160 ((x) == (y) || (/*CONSTCOND*/(w) && ((x) == ANY || (y) == ANY)))
161
162 #if 0
163 /* We will need this should we ever want gai_strerror() */
164 char *
165 irc_gai_strerror(int ecode)
166 {
167 if (ecode < 0 || ecode > EAI_MAX)
168 ecode = EAI_MAX;
169 return ai_errlist[ecode];
170 }
171 #endif
172
173 void
174 irc_freeaddrinfo(struct addrinfo *ai)
175 {
176 struct addrinfo *next;
177
178 do {
179 next = ai->ai_next;
180 if (ai->ai_canonname)
181 free(ai->ai_canonname);
182 /* no need to free(ai->ai_addr) */
183 free(ai);
184 ai = next;
185 } while (ai);
186 }
187
188 static int
189 str_isnumber(const char *p)
190 {
191 char *ep;
192
193 if (*p == '\0')
194 return NO;
195 ep = NULL;
196 errno = 0;
197 (void)strtoul(p, &ep, 10);
198 if (errno == 0 && ep && *ep == '\0')
199 return YES;
200 else
201 return NO;
202 }
203
204 int
205 irc_getaddrinfo(const char *hostname, const char *servname,
206 const struct addrinfo *hints, struct addrinfo **res)
207 {
208 struct addrinfo sentinel;
209 struct addrinfo *cur;
210 int error = 0;
211 struct addrinfo ai;
212 struct addrinfo ai0;
213 struct addrinfo *pai;
214 const struct explore *ex;
215
216 memset(&sentinel, 0, sizeof(sentinel));
217 cur = &sentinel;
218 pai = &ai;
219 pai->ai_flags = 0;
220 pai->ai_family = PF_UNSPEC;
221 pai->ai_socktype = ANY;
222 pai->ai_protocol = ANY;
223 pai->ai_addrlen = 0;
224 pai->ai_canonname = NULL;
225 pai->ai_addr = NULL;
226 pai->ai_next = NULL;
227
228 if (hostname == NULL && servname == NULL)
229 return EAI_NONAME;
230 if (hints) {
231 /* error check for hints */
232 if (hints->ai_addrlen || hints->ai_canonname ||
233 hints->ai_addr || hints->ai_next)
234 ERR(EAI_BADHINTS); /* xxx */
235 if (hints->ai_flags & ~AI_MASK)
236 ERR(EAI_BADFLAGS);
237 switch (hints->ai_family) {
238 case PF_UNSPEC:
239 case PF_INET:
240 #ifdef IPV6
241 case PF_INET6:
242 #endif
243 break;
244 default:
245 ERR(EAI_FAMILY);
246 }
247 memcpy(pai, hints, sizeof(*pai));
248
249 /*
250 * if both socktype/protocol are specified, check if they
251 * are meaningful combination.
252 */
253 if (pai->ai_socktype != ANY && pai->ai_protocol != ANY) {
254 for (ex = explore; ex->e_af >= 0; ex++) {
255 if (pai->ai_family != ex->e_af)
256 continue;
257 if (ex->e_socktype == ANY)
258 continue;
259 if (ex->e_protocol == ANY)
260 continue;
261 if (pai->ai_socktype == ex->e_socktype &&
262 pai->ai_protocol != ex->e_protocol) {
263 ERR(EAI_BADHINTS);
264 }
265 }
266 }
267 }
268
269 /*
270 * check for special cases. (1) numeric servname is disallowed if
271 * socktype/protocol are left unspecified. (2) servname is disallowed
272 * for raw and other inet{,6} sockets.
273 */
274 if (MATCH_FAMILY(pai->ai_family, PF_INET, 1)
275 #ifdef IPV6
276 || MATCH_FAMILY(pai->ai_family, PF_INET6, 1)
277 #endif
278 ) {
279 ai0 = *pai; /* backup *pai */
280
281 if (pai->ai_family == PF_UNSPEC) {
282 #ifdef IPV6
283 pai->ai_family = PF_INET6;
284 #else
285 pai->ai_family = PF_INET;
286 #endif
287 }
288 error = get_portmatch(pai, servname);
289 if (error)
290 ERR(error);
291
292 *pai = ai0;
293 }
294
295 ai0 = *pai;
296
297 /* NULL hostname, or numeric hostname */
298 for (ex = explore; ex->e_af >= 0; ex++) {
299 *pai = ai0;
300
301 /* PF_UNSPEC entries are prepared for DNS queries only */
302 if (ex->e_af == PF_UNSPEC)
303 continue;
304
305 if (!MATCH_FAMILY(pai->ai_family, ex->e_af, WILD_AF(ex)))
306 continue;
307 if (!MATCH(pai->ai_socktype, ex->e_socktype, WILD_SOCKTYPE(ex)))
308 continue;
309 if (!MATCH(pai->ai_protocol, ex->e_protocol, WILD_PROTOCOL(ex)))
310 continue;
311
312 if (pai->ai_family == PF_UNSPEC)
313 pai->ai_family = ex->e_af;
314 if (pai->ai_socktype == ANY && ex->e_socktype != ANY)
315 pai->ai_socktype = ex->e_socktype;
316 if (pai->ai_protocol == ANY && ex->e_protocol != ANY)
317 pai->ai_protocol = ex->e_protocol;
318
319 if (hostname == NULL)
320 error = explore_null(pai, servname, &cur->ai_next);
321 else
322 error = explore_numeric(pai, hostname, servname, &cur->ai_next);
323
324 if (error)
325 goto free;
326
327 while (cur && cur->ai_next)
328 cur = cur->ai_next;
329 }
330
331 /*
332 * XXX
333 * If numreic representation of AF1 can be interpreted as FQDN
334 * representation of AF2, we need to think again about the code below.
335 */
336 if (sentinel.ai_next)
337 goto good;
338
339 if (pai->ai_flags & AI_NUMERICHOST)
340 ERR(EAI_NONAME);
341 if (hostname == NULL)
342 ERR(EAI_NODATA);
343
344 /* XXX */
345 if (sentinel.ai_next)
346 error = 0;
347
348 if (error)
349 goto free;
350 if (error == 0) {
351 if (sentinel.ai_next) {
352 good:
353 *res = sentinel.ai_next;
354 return SUCCESS;
355 } else
356 error = EAI_FAIL;
357 }
358 free:
359 bad:
360 if (sentinel.ai_next)
361 irc_freeaddrinfo(sentinel.ai_next);
362 *res = NULL;
363 return error;
364 }
365
366 /*
367 * hostname == NULL.
368 * passive socket -> anyaddr (0.0.0.0 or ::)
369 * non-passive socket -> localhost (127.0.0.1 or ::1)
370 */
371 static int
372 explore_null(const struct addrinfo *pai, const char *servname, struct addrinfo **res)
373 {
374 int s;
375 const struct afd *afd;
376 struct addrinfo *cur;
377 struct addrinfo sentinel;
378 int error;
379
380 *res = NULL;
381 sentinel.ai_next = NULL;
382 cur = &sentinel;
383
384 /*
385 * filter out AFs that are not supported by the kernel
386 * XXX errno?
387 */
388 s = socket(pai->ai_family, SOCK_DGRAM, 0);
389 if (s < 0) {
390 #ifdef _WIN32
391 errno = WSAGetLastError();
392 #endif
393 if (errno != EMFILE)
394 return 0;
395 } else
396 #ifdef _WIN32
397 closesocket(s);
398 #else
399 close(s);
400 #endif
401
402 /*
403 * if the servname does not match socktype/protocol, ignore it.
404 */
405 if (get_portmatch(pai, servname) != 0)
406 return 0;
407
408 afd = find_afd(pai->ai_family);
409 if (afd == NULL)
410 return 0;
411
412 if (pai->ai_flags & AI_PASSIVE) {
413 GET_AI(cur->ai_next, afd, afd->a_addrany);
414 GET_PORT(cur->ai_next, servname);
415 } else {
416 GET_AI(cur->ai_next, afd, afd->a_loopback);
417 GET_PORT(cur->ai_next, servname);
418 }
419 cur = cur->ai_next;
420
421 *res = sentinel.ai_next;
422 return 0;
423
424 free:
425 if (sentinel.ai_next)
426 irc_freeaddrinfo(sentinel.ai_next);
427 return error;
428 }
429
430 /*
431 * numeric hostname
432 */
433 static int
434 explore_numeric(const struct addrinfo *pai, const char *hostname,
435 const char *servname, struct addrinfo **res)
436 {
437 const struct afd *afd;
438 struct addrinfo *cur;
439 struct addrinfo sentinel;
440 int error;
441 char pton[PTON_MAX];
442
443 *res = NULL;
444 sentinel.ai_next = NULL;
445 cur = &sentinel;
446
447 /*
448 * if the servname does not match socktype/protocol, ignore it.
449 */
450 if (get_portmatch(pai, servname) != 0)
451 return 0;
452
453 afd = find_afd(pai->ai_family);
454 if (afd == NULL)
455 return 0;
456
457 switch (afd->a_af) {
458 #if 1 /*X/Open spec*/
459 case AF_INET:
460 if (inet_aton(hostname, (struct in_addr *)pton) == 1) {
461 if (pai->ai_family == afd->a_af ||
462 pai->ai_family == PF_UNSPEC /*?*/) {
463 GET_AI(cur->ai_next, afd, pton);
464 GET_PORT(cur->ai_next, servname);
465 while (cur && cur->ai_next)
466 cur = cur->ai_next;
467 } else
468 ERR(EAI_FAMILY); /*xxx*/
469 }
470 break;
471 #endif
472 default:
473 if (inet_pton(afd->a_af, hostname, pton) == 1) {
474 if (pai->ai_family == afd->a_af ||
475 pai->ai_family == PF_UNSPEC /*?*/) {
476 GET_AI(cur->ai_next, afd, pton);
477 GET_PORT(cur->ai_next, servname);
478 while (cur && cur->ai_next)
479 cur = cur->ai_next;
480 } else
481 ERR(EAI_FAMILY); /* XXX */
482 }
483 break;
484 }
485
486 *res = sentinel.ai_next;
487 return 0;
488
489 free:
490 bad:
491 if (sentinel.ai_next)
492 irc_freeaddrinfo(sentinel.ai_next);
493 return error;
494 }
495
496 static struct addrinfo *
497 get_ai(const struct addrinfo *pai, const struct afd *afd, const char *addr)
498 {
499 char *p;
500 struct addrinfo *ai;
501
502 ai = (struct addrinfo *)malloc(sizeof(struct addrinfo)
503 + (afd->a_socklen));
504 if (ai == NULL)
505 return NULL;
506
507 memcpy(ai, pai, sizeof(struct addrinfo));
508 ai->ai_addr = (struct sockaddr *)(void *)(ai + 1);
509 memset(ai->ai_addr, 0, (size_t)afd->a_socklen);
510 ai->ai_addrlen = afd->a_socklen;
511 ai->ai_addr->sa_family = ai->ai_family = afd->a_af;
512 p = (char *)(void *)(ai->ai_addr);
513 memcpy(p + afd->a_off, addr, (size_t)afd->a_addrlen);
514 return ai;
515 }
516
517 static int
518 get_portmatch(const struct addrinfo *ai, const char *servname)
519 {
520 /* get_port does not touch first argument. when matchonly == 1. */
521 /* LINTED const cast */
522 return(get_port((struct addrinfo *)ai, servname, 1));
523 }
524
525 static int
526 get_port(struct addrinfo *ai, const char *servname, int matchonly)
527 {
528 const char *proto;
529 struct servent *sp;
530 int port;
531 int allownumeric;
532
533 if (servname == NULL)
534 return 0;
535 switch (ai->ai_family) {
536 case AF_INET:
537 #ifdef AF_INET6
538 case AF_INET6:
539 #endif
540 break;
541 default:
542 return 0;
543 }
544
545 switch (ai->ai_socktype) {
546 case SOCK_RAW:
547 return EAI_SERVICE;
548 case SOCK_DGRAM:
549 case SOCK_STREAM:
550 allownumeric = 1;
551 break;
552 case ANY:
553 allownumeric = 0;
554 break;
555 default:
556 return EAI_SOCKTYPE;
557 }
558
559 if (str_isnumber(servname)) {
560 if (!allownumeric)
561 return EAI_SERVICE;
562 port = atoi(servname);
563 if (port < 0 || port > 65535)
564 return EAI_SERVICE;
565 port = htons(port);
566 } else {
567 switch (ai->ai_socktype) {
568 case SOCK_DGRAM:
569 proto = "udp";
570 break;
571 case SOCK_STREAM:
572 proto = "tcp";
573 break;
574 default:
575 proto = NULL;
576 break;
577 }
578
579 if ((sp = getservbyname(servname, proto)) == NULL)
580 return EAI_SERVICE;
581 port = sp->s_port;
582 }
583
584 if (!matchonly) {
585 switch (ai->ai_family) {
586 case AF_INET:
587 ((struct sockaddr_in *)(void *)
588 ai->ai_addr)->sin_port = port;
589 break;
590 #ifdef IPV6
591 case AF_INET6:
592 ((struct sockaddr_in6 *)(void *)
593 ai->ai_addr)->sin6_port = port;
594 break;
595 #endif
596 }
597 }
598
599 return 0;
600 }
601
602 static const struct afd *
603 find_afd(int af)
604 {
605 const struct afd *afd;
606
607 if (af == PF_UNSPEC)
608 return(NULL);
609
610 for (afd = afdl; afd->a_af; afd++)
611 {
612 if (afd->a_af == af)
613 return(afd);
614 }
615
616 return(NULL);
617 }

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