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1 | /* | |
2 | * Copyright 2016-2018 The OpenSSL Project Authors. All Rights Reserved. | |
3 | * | |
4 | * Licensed under the Apache License 2.0 (the "License"). You may not use | |
5 | * this file except in compliance with the License. You can obtain a copy | |
6 | * in the file LICENSE in the source distribution or at | |
7 | * https://www.openssl.org/source/license.html | |
8 | */ | |
9 | ||
10 | #include <assert.h> | |
11 | #include <string.h> | |
12 | ||
13 | #include "bio_lcl.h" | |
14 | #include <openssl/crypto.h> | |
15 | ||
16 | #ifndef OPENSSL_NO_SOCK | |
17 | #include <openssl/err.h> | |
18 | #include <openssl/buffer.h> | |
19 | #include "internal/thread_once.h" | |
20 | ||
21 | CRYPTO_RWLOCK *bio_lookup_lock; | |
22 | static CRYPTO_ONCE bio_lookup_init = CRYPTO_ONCE_STATIC_INIT; | |
23 | ||
24 | /* | |
25 | * Throughout this file and bio_lcl.h, the existence of the macro | |
26 | * AI_PASSIVE is used to detect the availability of struct addrinfo, | |
27 | * getnameinfo() and getaddrinfo(). If that macro doesn't exist, | |
28 | * we use our own implementation instead, using gethostbyname, | |
29 | * getservbyname and a few other. | |
30 | */ | |
31 | ||
32 | /********************************************************************** | |
33 | * | |
34 | * Address structure | |
35 | * | |
36 | */ | |
37 | ||
38 | BIO_ADDR *BIO_ADDR_new(void) | |
39 | { | |
40 | BIO_ADDR *ret = OPENSSL_zalloc(sizeof(*ret)); | |
41 | ||
42 | if (ret == NULL) { | |
43 | BIOerr(BIO_F_BIO_ADDR_NEW, ERR_R_MALLOC_FAILURE); | |
44 | return NULL; | |
45 | } | |
46 | ||
47 | ret->sa.sa_family = AF_UNSPEC; | |
48 | return ret; | |
49 | } | |
50 | ||
51 | void BIO_ADDR_free(BIO_ADDR *ap) | |
52 | { | |
53 | OPENSSL_free(ap); | |
54 | } | |
55 | ||
56 | void BIO_ADDR_clear(BIO_ADDR *ap) | |
57 | { | |
58 | memset(ap, 0, sizeof(*ap)); | |
59 | ap->sa.sa_family = AF_UNSPEC; | |
60 | } | |
61 | ||
62 | /* | |
63 | * BIO_ADDR_make - non-public routine to fill a BIO_ADDR with the contents | |
64 | * of a struct sockaddr. | |
65 | */ | |
66 | int BIO_ADDR_make(BIO_ADDR *ap, const struct sockaddr *sa) | |
67 | { | |
68 | if (sa->sa_family == AF_INET) { | |
69 | memcpy(&(ap->s_in), sa, sizeof(struct sockaddr_in)); | |
70 | return 1; | |
71 | } | |
72 | #ifdef AF_INET6 | |
73 | if (sa->sa_family == AF_INET6) { | |
74 | memcpy(&(ap->s_in6), sa, sizeof(struct sockaddr_in6)); | |
75 | return 1; | |
76 | } | |
77 | #endif | |
78 | #ifdef AF_UNIX | |
79 | if (sa->sa_family == AF_UNIX) { | |
80 | memcpy(&(ap->s_un), sa, sizeof(struct sockaddr_un)); | |
81 | return 1; | |
82 | } | |
83 | #endif | |
84 | ||
85 | return 0; | |
86 | } | |
87 | ||
88 | int BIO_ADDR_rawmake(BIO_ADDR *ap, int family, | |
89 | const void *where, size_t wherelen, | |
90 | unsigned short port) | |
91 | { | |
92 | #ifdef AF_UNIX | |
93 | if (family == AF_UNIX) { | |
94 | if (wherelen + 1 > sizeof(ap->s_un.sun_path)) | |
95 | return 0; | |
96 | memset(&ap->s_un, 0, sizeof(ap->s_un)); | |
97 | ap->s_un.sun_family = family; | |
98 | strncpy(ap->s_un.sun_path, where, sizeof(ap->s_un.sun_path) - 1); | |
99 | return 1; | |
100 | } | |
101 | #endif | |
102 | if (family == AF_INET) { | |
103 | if (wherelen != sizeof(struct in_addr)) | |
104 | return 0; | |
105 | memset(&ap->s_in, 0, sizeof(ap->s_in)); | |
106 | ap->s_in.sin_family = family; | |
107 | ap->s_in.sin_port = port; | |
108 | ap->s_in.sin_addr = *(struct in_addr *)where; | |
109 | return 1; | |
110 | } | |
111 | #ifdef AF_INET6 | |
112 | if (family == AF_INET6) { | |
113 | if (wherelen != sizeof(struct in6_addr)) | |
114 | return 0; | |
115 | memset(&ap->s_in6, 0, sizeof(ap->s_in6)); | |
116 | ap->s_in6.sin6_family = family; | |
117 | ap->s_in6.sin6_port = port; | |
118 | ap->s_in6.sin6_addr = *(struct in6_addr *)where; | |
119 | return 1; | |
120 | } | |
121 | #endif | |
122 | ||
123 | return 0; | |
124 | } | |
125 | ||
126 | int BIO_ADDR_family(const BIO_ADDR *ap) | |
127 | { | |
128 | return ap->sa.sa_family; | |
129 | } | |
130 | ||
131 | int BIO_ADDR_rawaddress(const BIO_ADDR *ap, void *p, size_t *l) | |
132 | { | |
133 | size_t len = 0; | |
134 | const void *addrptr = NULL; | |
135 | ||
136 | if (ap->sa.sa_family == AF_INET) { | |
137 | len = sizeof(ap->s_in.sin_addr); | |
138 | addrptr = &ap->s_in.sin_addr; | |
139 | } | |
140 | #ifdef AF_INET6 | |
141 | else if (ap->sa.sa_family == AF_INET6) { | |
142 | len = sizeof(ap->s_in6.sin6_addr); | |
143 | addrptr = &ap->s_in6.sin6_addr; | |
144 | } | |
145 | #endif | |
146 | #ifdef AF_UNIX | |
147 | else if (ap->sa.sa_family == AF_UNIX) { | |
148 | len = strlen(ap->s_un.sun_path); | |
149 | addrptr = &ap->s_un.sun_path; | |
150 | } | |
151 | #endif | |
152 | ||
153 | if (addrptr == NULL) | |
154 | return 0; | |
155 | ||
156 | if (p != NULL) { | |
157 | memcpy(p, addrptr, len); | |
158 | } | |
159 | if (l != NULL) | |
160 | *l = len; | |
161 | ||
162 | return 1; | |
163 | } | |
164 | ||
165 | unsigned short BIO_ADDR_rawport(const BIO_ADDR *ap) | |
166 | { | |
167 | if (ap->sa.sa_family == AF_INET) | |
168 | return ap->s_in.sin_port; | |
169 | #ifdef AF_INET6 | |
170 | if (ap->sa.sa_family == AF_INET6) | |
171 | return ap->s_in6.sin6_port; | |
172 | #endif | |
173 | return 0; | |
174 | } | |
175 | ||
176 | /*- | |
177 | * addr_strings - helper function to get host and service names | |
178 | * @ap: the BIO_ADDR that has the input info | |
179 | * @numeric: 0 if actual names should be returned, 1 if the numeric | |
180 | * representation should be returned. | |
181 | * @hostname: a pointer to a pointer to a memory area to store the | |
182 | * host name or numeric representation. Unused if NULL. | |
183 | * @service: a pointer to a pointer to a memory area to store the | |
184 | * service name or numeric representation. Unused if NULL. | |
185 | * | |
186 | * The return value is 0 on failure, with the error code in the error | |
187 | * stack, and 1 on success. | |
188 | */ | |
189 | static int addr_strings(const BIO_ADDR *ap, int numeric, | |
190 | char **hostname, char **service) | |
191 | { | |
192 | if (BIO_sock_init() != 1) | |
193 | return 0; | |
194 | ||
195 | if (1) { | |
196 | #ifdef AI_PASSIVE | |
197 | int ret = 0; | |
198 | char host[NI_MAXHOST] = "", serv[NI_MAXSERV] = ""; | |
199 | int flags = 0; | |
200 | ||
201 | if (numeric) | |
202 | flags |= NI_NUMERICHOST | NI_NUMERICSERV; | |
203 | ||
204 | if ((ret = getnameinfo(BIO_ADDR_sockaddr(ap), | |
205 | BIO_ADDR_sockaddr_size(ap), | |
206 | host, sizeof(host), serv, sizeof(serv), | |
207 | flags)) != 0) { | |
208 | # ifdef EAI_SYSTEM | |
209 | if (ret == EAI_SYSTEM) { | |
210 | ERR_raise_data(ERR_LIB_SYS, get_last_socket_error(), | |
211 | "calling getnameinfo()"); | |
212 | BIOerr(BIO_F_ADDR_STRINGS, ERR_R_SYS_LIB); | |
213 | } else | |
214 | # endif | |
215 | { | |
216 | BIOerr(BIO_F_ADDR_STRINGS, ERR_R_SYS_LIB); | |
217 | ERR_add_error_data(1, gai_strerror(ret)); | |
218 | } | |
219 | return 0; | |
220 | } | |
221 | ||
222 | /* VMS getnameinfo() has a bug, it doesn't fill in serv, which | |
223 | * leaves it with whatever garbage that happens to be there. | |
224 | * However, we initialise serv with the empty string (serv[0] | |
225 | * is therefore NUL), so it gets real easy to detect when things | |
226 | * didn't go the way one might expect. | |
227 | */ | |
228 | if (serv[0] == '\0') { | |
229 | BIO_snprintf(serv, sizeof(serv), "%d", | |
230 | ntohs(BIO_ADDR_rawport(ap))); | |
231 | } | |
232 | ||
233 | if (hostname != NULL) | |
234 | *hostname = OPENSSL_strdup(host); | |
235 | if (service != NULL) | |
236 | *service = OPENSSL_strdup(serv); | |
237 | } else { | |
238 | #endif | |
239 | if (hostname != NULL) | |
240 | *hostname = OPENSSL_strdup(inet_ntoa(ap->s_in.sin_addr)); | |
241 | if (service != NULL) { | |
242 | char serv[6]; /* port is 16 bits => max 5 decimal digits */ | |
243 | BIO_snprintf(serv, sizeof(serv), "%d", ntohs(ap->s_in.sin_port)); | |
244 | *service = OPENSSL_strdup(serv); | |
245 | } | |
246 | } | |
247 | ||
248 | if ((hostname != NULL && *hostname == NULL) | |
249 | || (service != NULL && *service == NULL)) { | |
250 | if (hostname != NULL) { | |
251 | OPENSSL_free(*hostname); | |
252 | *hostname = NULL; | |
253 | } | |
254 | if (service != NULL) { | |
255 | OPENSSL_free(*service); | |
256 | *service = NULL; | |
257 | } | |
258 | BIOerr(BIO_F_ADDR_STRINGS, ERR_R_MALLOC_FAILURE); | |
259 | return 0; | |
260 | } | |
261 | ||
262 | return 1; | |
263 | } | |
264 | ||
265 | char *BIO_ADDR_hostname_string(const BIO_ADDR *ap, int numeric) | |
266 | { | |
267 | char *hostname = NULL; | |
268 | ||
269 | if (addr_strings(ap, numeric, &hostname, NULL)) | |
270 | return hostname; | |
271 | ||
272 | return NULL; | |
273 | } | |
274 | ||
275 | char *BIO_ADDR_service_string(const BIO_ADDR *ap, int numeric) | |
276 | { | |
277 | char *service = NULL; | |
278 | ||
279 | if (addr_strings(ap, numeric, NULL, &service)) | |
280 | return service; | |
281 | ||
282 | return NULL; | |
283 | } | |
284 | ||
285 | char *BIO_ADDR_path_string(const BIO_ADDR *ap) | |
286 | { | |
287 | #ifdef AF_UNIX | |
288 | if (ap->sa.sa_family == AF_UNIX) | |
289 | return OPENSSL_strdup(ap->s_un.sun_path); | |
290 | #endif | |
291 | return NULL; | |
292 | } | |
293 | ||
294 | /* | |
295 | * BIO_ADDR_sockaddr - non-public routine to return the struct sockaddr | |
296 | * for a given BIO_ADDR. In reality, this is simply a type safe cast. | |
297 | * The returned struct sockaddr is const, so it can't be tampered with. | |
298 | */ | |
299 | const struct sockaddr *BIO_ADDR_sockaddr(const BIO_ADDR *ap) | |
300 | { | |
301 | return &(ap->sa); | |
302 | } | |
303 | ||
304 | /* | |
305 | * BIO_ADDR_sockaddr_noconst - non-public function that does the same | |
306 | * as BIO_ADDR_sockaddr, but returns a non-const. USE WITH CARE, as | |
307 | * it allows you to tamper with the data (and thereby the contents | |
308 | * of the input BIO_ADDR). | |
309 | */ | |
310 | struct sockaddr *BIO_ADDR_sockaddr_noconst(BIO_ADDR *ap) | |
311 | { | |
312 | return &(ap->sa); | |
313 | } | |
314 | ||
315 | /* | |
316 | * BIO_ADDR_sockaddr_size - non-public function that returns the size | |
317 | * of the struct sockaddr the BIO_ADDR is using. If the protocol family | |
318 | * isn't set or is something other than AF_INET, AF_INET6 or AF_UNIX, | |
319 | * the size of the BIO_ADDR type is returned. | |
320 | */ | |
321 | socklen_t BIO_ADDR_sockaddr_size(const BIO_ADDR *ap) | |
322 | { | |
323 | if (ap->sa.sa_family == AF_INET) | |
324 | return sizeof(ap->s_in); | |
325 | #ifdef AF_INET6 | |
326 | if (ap->sa.sa_family == AF_INET6) | |
327 | return sizeof(ap->s_in6); | |
328 | #endif | |
329 | #ifdef AF_UNIX | |
330 | if (ap->sa.sa_family == AF_UNIX) | |
331 | return sizeof(ap->s_un); | |
332 | #endif | |
333 | return sizeof(*ap); | |
334 | } | |
335 | ||
336 | /********************************************************************** | |
337 | * | |
338 | * Address info database | |
339 | * | |
340 | */ | |
341 | ||
342 | const BIO_ADDRINFO *BIO_ADDRINFO_next(const BIO_ADDRINFO *bai) | |
343 | { | |
344 | if (bai != NULL) | |
345 | return bai->bai_next; | |
346 | return NULL; | |
347 | } | |
348 | ||
349 | int BIO_ADDRINFO_family(const BIO_ADDRINFO *bai) | |
350 | { | |
351 | if (bai != NULL) | |
352 | return bai->bai_family; | |
353 | return 0; | |
354 | } | |
355 | ||
356 | int BIO_ADDRINFO_socktype(const BIO_ADDRINFO *bai) | |
357 | { | |
358 | if (bai != NULL) | |
359 | return bai->bai_socktype; | |
360 | return 0; | |
361 | } | |
362 | ||
363 | int BIO_ADDRINFO_protocol(const BIO_ADDRINFO *bai) | |
364 | { | |
365 | if (bai != NULL) { | |
366 | if (bai->bai_protocol != 0) | |
367 | return bai->bai_protocol; | |
368 | ||
369 | #ifdef AF_UNIX | |
370 | if (bai->bai_family == AF_UNIX) | |
371 | return 0; | |
372 | #endif | |
373 | ||
374 | switch (bai->bai_socktype) { | |
375 | case SOCK_STREAM: | |
376 | return IPPROTO_TCP; | |
377 | case SOCK_DGRAM: | |
378 | return IPPROTO_UDP; | |
379 | default: | |
380 | break; | |
381 | } | |
382 | } | |
383 | return 0; | |
384 | } | |
385 | ||
386 | /* | |
387 | * BIO_ADDRINFO_sockaddr_size - non-public function that returns the size | |
388 | * of the struct sockaddr inside the BIO_ADDRINFO. | |
389 | */ | |
390 | socklen_t BIO_ADDRINFO_sockaddr_size(const BIO_ADDRINFO *bai) | |
391 | { | |
392 | if (bai != NULL) | |
393 | return bai->bai_addrlen; | |
394 | return 0; | |
395 | } | |
396 | ||
397 | /* | |
398 | * BIO_ADDRINFO_sockaddr - non-public function that returns bai_addr | |
399 | * as the struct sockaddr it is. | |
400 | */ | |
401 | const struct sockaddr *BIO_ADDRINFO_sockaddr(const BIO_ADDRINFO *bai) | |
402 | { | |
403 | if (bai != NULL) | |
404 | return bai->bai_addr; | |
405 | return NULL; | |
406 | } | |
407 | ||
408 | const BIO_ADDR *BIO_ADDRINFO_address(const BIO_ADDRINFO *bai) | |
409 | { | |
410 | if (bai != NULL) | |
411 | return (BIO_ADDR *)bai->bai_addr; | |
412 | return NULL; | |
413 | } | |
414 | ||
415 | void BIO_ADDRINFO_free(BIO_ADDRINFO *bai) | |
416 | { | |
417 | if (bai == NULL) | |
418 | return; | |
419 | ||
420 | #ifdef AI_PASSIVE | |
421 | # ifdef AF_UNIX | |
422 | # define _cond bai->bai_family != AF_UNIX | |
423 | # else | |
424 | # define _cond 1 | |
425 | # endif | |
426 | if (_cond) { | |
427 | freeaddrinfo(bai); | |
428 | return; | |
429 | } | |
430 | #endif | |
431 | ||
432 | /* Free manually when we know that addrinfo_wrap() was used. | |
433 | * See further comment above addrinfo_wrap() | |
434 | */ | |
435 | while (bai != NULL) { | |
436 | BIO_ADDRINFO *next = bai->bai_next; | |
437 | OPENSSL_free(bai->bai_addr); | |
438 | OPENSSL_free(bai); | |
439 | bai = next; | |
440 | } | |
441 | } | |
442 | ||
443 | /********************************************************************** | |
444 | * | |
445 | * Service functions | |
446 | * | |
447 | */ | |
448 | ||
449 | /*- | |
450 | * The specs in hostserv can take these forms: | |
451 | * | |
452 | * host:service => *host = "host", *service = "service" | |
453 | * host:* => *host = "host", *service = NULL | |
454 | * host: => *host = "host", *service = NULL | |
455 | * :service => *host = NULL, *service = "service" | |
456 | * *:service => *host = NULL, *service = "service" | |
457 | * | |
458 | * in case no : is present in the string, the result depends on | |
459 | * hostserv_prio, as follows: | |
460 | * | |
461 | * when hostserv_prio == BIO_PARSE_PRIO_HOST | |
462 | * host => *host = "host", *service untouched | |
463 | * | |
464 | * when hostserv_prio == BIO_PARSE_PRIO_SERV | |
465 | * service => *host untouched, *service = "service" | |
466 | * | |
467 | */ | |
468 | int BIO_parse_hostserv(const char *hostserv, char **host, char **service, | |
469 | enum BIO_hostserv_priorities hostserv_prio) | |
470 | { | |
471 | const char *h = NULL; size_t hl = 0; | |
472 | const char *p = NULL; size_t pl = 0; | |
473 | ||
474 | if (*hostserv == '[') { | |
475 | if ((p = strchr(hostserv, ']')) == NULL) | |
476 | goto spec_err; | |
477 | h = hostserv + 1; | |
478 | hl = p - h; | |
479 | p++; | |
480 | if (*p == '\0') | |
481 | p = NULL; | |
482 | else if (*p != ':') | |
483 | goto spec_err; | |
484 | else { | |
485 | p++; | |
486 | pl = strlen(p); | |
487 | } | |
488 | } else { | |
489 | const char *p2 = strrchr(hostserv, ':'); | |
490 | p = strchr(hostserv, ':'); | |
491 | ||
492 | /*- | |
493 | * Check for more than one colon. There are three possible | |
494 | * interpretations: | |
495 | * 1. IPv6 address with port number, last colon being separator. | |
496 | * 2. IPv6 address only. | |
497 | * 3. IPv6 address only if hostserv_prio == BIO_PARSE_PRIO_HOST, | |
498 | * IPv6 address and port number if hostserv_prio == BIO_PARSE_PRIO_SERV | |
499 | * Because of this ambiguity, we currently choose to make it an | |
500 | * error. | |
501 | */ | |
502 | if (p != p2) | |
503 | goto amb_err; | |
504 | ||
505 | if (p != NULL) { | |
506 | h = hostserv; | |
507 | hl = p - h; | |
508 | p++; | |
509 | pl = strlen(p); | |
510 | } else if (hostserv_prio == BIO_PARSE_PRIO_HOST) { | |
511 | h = hostserv; | |
512 | hl = strlen(h); | |
513 | } else { | |
514 | p = hostserv; | |
515 | pl = strlen(p); | |
516 | } | |
517 | } | |
518 | ||
519 | if (p != NULL && strchr(p, ':')) | |
520 | goto spec_err; | |
521 | ||
522 | if (h != NULL && host != NULL) { | |
523 | if (hl == 0 | |
524 | || (hl == 1 && h[0] == '*')) { | |
525 | *host = NULL; | |
526 | } else { | |
527 | *host = OPENSSL_strndup(h, hl); | |
528 | if (*host == NULL) | |
529 | goto memerr; | |
530 | } | |
531 | } | |
532 | if (p != NULL && service != NULL) { | |
533 | if (pl == 0 | |
534 | || (pl == 1 && p[0] == '*')) { | |
535 | *service = NULL; | |
536 | } else { | |
537 | *service = OPENSSL_strndup(p, pl); | |
538 | if (*service == NULL) | |
539 | goto memerr; | |
540 | } | |
541 | } | |
542 | ||
543 | return 1; | |
544 | amb_err: | |
545 | BIOerr(BIO_F_BIO_PARSE_HOSTSERV, BIO_R_AMBIGUOUS_HOST_OR_SERVICE); | |
546 | return 0; | |
547 | spec_err: | |
548 | BIOerr(BIO_F_BIO_PARSE_HOSTSERV, BIO_R_MALFORMED_HOST_OR_SERVICE); | |
549 | return 0; | |
550 | memerr: | |
551 | BIOerr(BIO_F_BIO_PARSE_HOSTSERV, ERR_R_MALLOC_FAILURE); | |
552 | return 0; | |
553 | } | |
554 | ||
555 | /* addrinfo_wrap is used to build our own addrinfo "chain". | |
556 | * (it has only one entry, so calling it a chain may be a stretch) | |
557 | * It should ONLY be called when getaddrinfo() and friends | |
558 | * aren't available, OR when dealing with a non IP protocol | |
559 | * family, such as AF_UNIX | |
560 | * | |
561 | * the return value is 1 on success, or 0 on failure, which | |
562 | * only happens if a memory allocation error occurred. | |
563 | */ | |
564 | static int addrinfo_wrap(int family, int socktype, | |
565 | const void *where, size_t wherelen, | |
566 | unsigned short port, | |
567 | BIO_ADDRINFO **bai) | |
568 | { | |
569 | if ((*bai = OPENSSL_zalloc(sizeof(**bai))) == NULL) { | |
570 | BIOerr(BIO_F_ADDRINFO_WRAP, ERR_R_MALLOC_FAILURE); | |
571 | return 0; | |
572 | } | |
573 | ||
574 | (*bai)->bai_family = family; | |
575 | (*bai)->bai_socktype = socktype; | |
576 | if (socktype == SOCK_STREAM) | |
577 | (*bai)->bai_protocol = IPPROTO_TCP; | |
578 | if (socktype == SOCK_DGRAM) | |
579 | (*bai)->bai_protocol = IPPROTO_UDP; | |
580 | #ifdef AF_UNIX | |
581 | if (family == AF_UNIX) | |
582 | (*bai)->bai_protocol = 0; | |
583 | #endif | |
584 | { | |
585 | /* Magic: We know that BIO_ADDR_sockaddr_noconst is really | |
586 | just an advanced cast of BIO_ADDR* to struct sockaddr * | |
587 | by the power of union, so while it may seem that we're | |
588 | creating a memory leak here, we are not. It will be | |
589 | all right. */ | |
590 | BIO_ADDR *addr = BIO_ADDR_new(); | |
591 | if (addr != NULL) { | |
592 | BIO_ADDR_rawmake(addr, family, where, wherelen, port); | |
593 | (*bai)->bai_addr = BIO_ADDR_sockaddr_noconst(addr); | |
594 | } | |
595 | } | |
596 | (*bai)->bai_next = NULL; | |
597 | if ((*bai)->bai_addr == NULL) { | |
598 | BIO_ADDRINFO_free(*bai); | |
599 | *bai = NULL; | |
600 | return 0; | |
601 | } | |
602 | return 1; | |
603 | } | |
604 | ||
605 | DEFINE_RUN_ONCE_STATIC(do_bio_lookup_init) | |
606 | { | |
607 | if (!OPENSSL_init_crypto(0, NULL)) | |
608 | return 0; | |
609 | bio_lookup_lock = CRYPTO_THREAD_lock_new(); | |
610 | return bio_lookup_lock != NULL; | |
611 | } | |
612 | ||
613 | int BIO_lookup(const char *host, const char *service, | |
614 | enum BIO_lookup_type lookup_type, | |
615 | int family, int socktype, BIO_ADDRINFO **res) | |
616 | { | |
617 | return BIO_lookup_ex(host, service, lookup_type, family, socktype, 0, res); | |
618 | } | |
619 | ||
620 | /*- | |
621 | * BIO_lookup_ex - look up the node and service you want to connect to. | |
622 | * @node: the node you want to connect to. | |
623 | * @service: the service you want to connect to. | |
624 | * @lookup_type: declare intent with the result, client or server. | |
625 | * @family: the address family you want to use. Use AF_UNSPEC for any, or | |
626 | * AF_INET, AF_INET6 or AF_UNIX. | |
627 | * @socktype: The socket type you want to use. Can be SOCK_STREAM, SOCK_DGRAM | |
628 | * or 0 for all. | |
629 | * @protocol: The protocol to use, e.g. IPPROTO_TCP or IPPROTO_UDP or 0 for all. | |
630 | * Note that some platforms may not return IPPROTO_SCTP without | |
631 | * explicitly requesting it (i.e. IPPROTO_SCTP may not be returned | |
632 | * with 0 for the protocol) | |
633 | * @res: Storage place for the resulting list of returned addresses | |
634 | * | |
635 | * This will do a lookup of the node and service that you want to connect to. | |
636 | * It returns a linked list of different addresses you can try to connect to. | |
637 | * | |
638 | * When no longer needed you should call BIO_ADDRINFO_free() to free the result. | |
639 | * | |
640 | * The return value is 1 on success or 0 in case of error. | |
641 | */ | |
642 | int BIO_lookup_ex(const char *host, const char *service, int lookup_type, | |
643 | int family, int socktype, int protocol, BIO_ADDRINFO **res) | |
644 | { | |
645 | int ret = 0; /* Assume failure */ | |
646 | ||
647 | switch(family) { | |
648 | case AF_INET: | |
649 | #ifdef AF_INET6 | |
650 | case AF_INET6: | |
651 | #endif | |
652 | #ifdef AF_UNIX | |
653 | case AF_UNIX: | |
654 | #endif | |
655 | #ifdef AF_UNSPEC | |
656 | case AF_UNSPEC: | |
657 | #endif | |
658 | break; | |
659 | default: | |
660 | BIOerr(BIO_F_BIO_LOOKUP_EX, BIO_R_UNSUPPORTED_PROTOCOL_FAMILY); | |
661 | return 0; | |
662 | } | |
663 | ||
664 | #ifdef AF_UNIX | |
665 | if (family == AF_UNIX) { | |
666 | if (addrinfo_wrap(family, socktype, host, strlen(host), 0, res)) | |
667 | return 1; | |
668 | else | |
669 | BIOerr(BIO_F_BIO_LOOKUP_EX, ERR_R_MALLOC_FAILURE); | |
670 | return 0; | |
671 | } | |
672 | #endif | |
673 | ||
674 | if (BIO_sock_init() != 1) | |
675 | return 0; | |
676 | ||
677 | if (1) { | |
678 | #ifdef AI_PASSIVE | |
679 | int gai_ret = 0, old_ret = 0; | |
680 | struct addrinfo hints; | |
681 | ||
682 | memset(&hints, 0, sizeof(hints)); | |
683 | ||
684 | hints.ai_family = family; | |
685 | hints.ai_socktype = socktype; | |
686 | hints.ai_protocol = protocol; | |
687 | # ifdef AI_ADDRCONFIG | |
688 | # ifdef AF_UNSPEC | |
689 | if (family == AF_UNSPEC) | |
690 | # endif | |
691 | hints.ai_flags |= AI_ADDRCONFIG; | |
692 | # endif | |
693 | ||
694 | if (lookup_type == BIO_LOOKUP_SERVER) | |
695 | hints.ai_flags |= AI_PASSIVE; | |
696 | ||
697 | /* Note that |res| SHOULD be a 'struct addrinfo **' thanks to | |
698 | * macro magic in bio_lcl.h | |
699 | */ | |
700 | retry: | |
701 | switch ((gai_ret = getaddrinfo(host, service, &hints, res))) { | |
702 | # ifdef EAI_SYSTEM | |
703 | case EAI_SYSTEM: | |
704 | ERR_raise_data(ERR_LIB_SYS, get_last_socket_error(), | |
705 | "calling getaddrinfo()"); | |
706 | BIOerr(BIO_F_BIO_LOOKUP_EX, ERR_R_SYS_LIB); | |
707 | break; | |
708 | # endif | |
709 | # ifdef EAI_MEMORY | |
710 | case EAI_MEMORY: | |
711 | BIOerr(BIO_F_BIO_LOOKUP_EX, ERR_R_MALLOC_FAILURE); | |
712 | break; | |
713 | # endif | |
714 | case 0: | |
715 | ret = 1; /* Success */ | |
716 | break; | |
717 | default: | |
718 | # if defined(AI_ADDRCONFIG) && defined(AI_NUMERICHOST) | |
719 | if (hints.ai_flags & AI_ADDRCONFIG) { | |
720 | hints.ai_flags &= ~AI_ADDRCONFIG; | |
721 | hints.ai_flags |= AI_NUMERICHOST; | |
722 | old_ret = gai_ret; | |
723 | goto retry; | |
724 | } | |
725 | # endif | |
726 | BIOerr(BIO_F_BIO_LOOKUP_EX, ERR_R_SYS_LIB); | |
727 | ERR_add_error_data(1, gai_strerror(old_ret ? old_ret : gai_ret)); | |
728 | break; | |
729 | } | |
730 | } else { | |
731 | #endif | |
732 | const struct hostent *he; | |
733 | /* | |
734 | * Because struct hostent is defined for 32-bit pointers only with | |
735 | * VMS C, we need to make sure that '&he_fallback_address' and | |
736 | * '&he_fallback_addresses' are 32-bit pointers | |
737 | */ | |
738 | #if defined(OPENSSL_SYS_VMS) && defined(__DECC) | |
739 | # pragma pointer_size save | |
740 | # pragma pointer_size 32 | |
741 | #endif | |
742 | /* Windows doesn't seem to have in_addr_t */ | |
743 | #ifdef OPENSSL_SYS_WINDOWS | |
744 | static uint32_t he_fallback_address; | |
745 | static const char *he_fallback_addresses[] = | |
746 | { (char *)&he_fallback_address, NULL }; | |
747 | #else | |
748 | static in_addr_t he_fallback_address; | |
749 | static const char *he_fallback_addresses[] = | |
750 | { (char *)&he_fallback_address, NULL }; | |
751 | #endif | |
752 | static const struct hostent he_fallback = | |
753 | { NULL, NULL, AF_INET, sizeof(he_fallback_address), | |
754 | (char **)&he_fallback_addresses }; | |
755 | #if defined(OPENSSL_SYS_VMS) && defined(__DECC) | |
756 | # pragma pointer_size restore | |
757 | #endif | |
758 | ||
759 | struct servent *se; | |
760 | /* Apparently, on WIN64, s_proto and s_port have traded places... */ | |
761 | #ifdef _WIN64 | |
762 | struct servent se_fallback = { NULL, NULL, NULL, 0 }; | |
763 | #else | |
764 | struct servent se_fallback = { NULL, NULL, 0, NULL }; | |
765 | #endif | |
766 | ||
767 | if (!RUN_ONCE(&bio_lookup_init, do_bio_lookup_init)) { | |
768 | BIOerr(BIO_F_BIO_LOOKUP_EX, ERR_R_MALLOC_FAILURE); | |
769 | ret = 0; | |
770 | goto err; | |
771 | } | |
772 | ||
773 | CRYPTO_THREAD_write_lock(bio_lookup_lock); | |
774 | he_fallback_address = INADDR_ANY; | |
775 | if (host == NULL) { | |
776 | he = &he_fallback; | |
777 | switch(lookup_type) { | |
778 | case BIO_LOOKUP_CLIENT: | |
779 | he_fallback_address = INADDR_LOOPBACK; | |
780 | break; | |
781 | case BIO_LOOKUP_SERVER: | |
782 | he_fallback_address = INADDR_ANY; | |
783 | break; | |
784 | default: | |
785 | /* We forgot to handle a lookup type! */ | |
786 | assert("We forgot to handle a lookup type!" == NULL); | |
787 | BIOerr(BIO_F_BIO_LOOKUP_EX, ERR_R_INTERNAL_ERROR); | |
788 | ret = 0; | |
789 | goto err; | |
790 | } | |
791 | } else { | |
792 | he = gethostbyname(host); | |
793 | ||
794 | if (he == NULL) { | |
795 | #ifndef OPENSSL_SYS_WINDOWS | |
796 | /* | |
797 | * This might be misleading, because h_errno is used as if | |
798 | * it was errno. To minimize mixup add 1000. Underlying | |
799 | * reason for this is that hstrerror is declared obsolete, | |
800 | * not to mention that a) h_errno is not always guaranteed | |
801 | * to be meaningless; b) hstrerror can reside in yet another | |
802 | * library, linking for sake of hstrerror is an overkill; | |
803 | * c) this path is not executed on contemporary systems | |
804 | * anyway [above getaddrinfo/gai_strerror is]. We just let | |
805 | * system administrator figure this out... | |
806 | */ | |
807 | # if defined(OPENSSL_SYS_VXWORKS) | |
808 | /* h_errno doesn't exist on VxWorks */ | |
809 | ERR_raise_data(ERR_LIB_SYS, 1000, | |
810 | "calling gethostbyname()"); | |
811 | # else | |
812 | ERR_raise_data(ERR_LIB_SYS, 1000 + h_errno, | |
813 | "calling gethostbyname()"); | |
814 | # endif | |
815 | #else | |
816 | ERR_raise_data(ERR_LIB_SYS, get_last_socket_error(), | |
817 | "calling gethostbyname()"); | |
818 | #endif | |
819 | ret = 0; | |
820 | goto err; | |
821 | } | |
822 | } | |
823 | ||
824 | if (service == NULL) { | |
825 | se_fallback.s_port = 0; | |
826 | se_fallback.s_proto = NULL; | |
827 | se = &se_fallback; | |
828 | } else { | |
829 | char *endp = NULL; | |
830 | long portnum = strtol(service, &endp, 10); | |
831 | ||
832 | /* | |
833 | * Because struct servent is defined for 32-bit pointers only with | |
834 | * VMS C, we need to make sure that 'proto' is a 32-bit pointer. | |
835 | */ | |
836 | #if defined(OPENSSL_SYS_VMS) && defined(__DECC) | |
837 | # pragma pointer_size save | |
838 | # pragma pointer_size 32 | |
839 | #endif | |
840 | char *proto = NULL; | |
841 | #if defined(OPENSSL_SYS_VMS) && defined(__DECC) | |
842 | # pragma pointer_size restore | |
843 | #endif | |
844 | ||
845 | switch (socktype) { | |
846 | case SOCK_STREAM: | |
847 | proto = "tcp"; | |
848 | break; | |
849 | case SOCK_DGRAM: | |
850 | proto = "udp"; | |
851 | break; | |
852 | } | |
853 | ||
854 | if (endp != service && *endp == '\0' | |
855 | && portnum > 0 && portnum < 65536) { | |
856 | se_fallback.s_port = htons((unsigned short)portnum); | |
857 | se_fallback.s_proto = proto; | |
858 | se = &se_fallback; | |
859 | } else if (endp == service) { | |
860 | se = getservbyname(service, proto); | |
861 | ||
862 | if (se == NULL) { | |
863 | ERR_raise_data(ERR_LIB_SYS, get_last_socket_error(), | |
864 | "calling getservbyname()"); | |
865 | goto err; | |
866 | } | |
867 | } else { | |
868 | BIOerr(BIO_F_BIO_LOOKUP_EX, BIO_R_MALFORMED_HOST_OR_SERVICE); | |
869 | goto err; | |
870 | } | |
871 | } | |
872 | ||
873 | *res = NULL; | |
874 | ||
875 | { | |
876 | /* | |
877 | * Because hostent::h_addr_list is an array of 32-bit pointers with VMS C, | |
878 | * we must make sure our iterator designates the same element type, hence | |
879 | * the pointer size dance. | |
880 | */ | |
881 | #if defined(OPENSSL_SYS_VMS) && defined(__DECC) | |
882 | # pragma pointer_size save | |
883 | # pragma pointer_size 32 | |
884 | #endif | |
885 | char **addrlistp; | |
886 | #if defined(OPENSSL_SYS_VMS) && defined(__DECC) | |
887 | # pragma pointer_size restore | |
888 | #endif | |
889 | size_t addresses; | |
890 | BIO_ADDRINFO *tmp_bai = NULL; | |
891 | ||
892 | /* The easiest way to create a linked list from an | |
893 | array is to start from the back */ | |
894 | for(addrlistp = he->h_addr_list; *addrlistp != NULL; | |
895 | addrlistp++) | |
896 | ; | |
897 | ||
898 | for(addresses = addrlistp - he->h_addr_list; | |
899 | addrlistp--, addresses-- > 0; ) { | |
900 | if (!addrinfo_wrap(he->h_addrtype, socktype, | |
901 | *addrlistp, he->h_length, | |
902 | se->s_port, &tmp_bai)) | |
903 | goto addrinfo_malloc_err; | |
904 | tmp_bai->bai_next = *res; | |
905 | *res = tmp_bai; | |
906 | continue; | |
907 | addrinfo_malloc_err: | |
908 | BIO_ADDRINFO_free(*res); | |
909 | *res = NULL; | |
910 | BIOerr(BIO_F_BIO_LOOKUP_EX, ERR_R_MALLOC_FAILURE); | |
911 | ret = 0; | |
912 | goto err; | |
913 | } | |
914 | ||
915 | ret = 1; | |
916 | } | |
917 | err: | |
918 | CRYPTO_THREAD_unlock(bio_lookup_lock); | |
919 | } | |
920 | ||
921 | return ret; | |
922 | } | |
923 | ||
924 | #endif /* OPENSSL_NO_SOCK */ |