1 /*
2 * Copyright 2016-2022 The OpenSSL Project Authors. All Rights Reserved.
3 *
4 * Licensed under the OpenSSL license (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 #ifndef _GNU_SOURCE
11 # define _GNU_SOURCE
12 #endif
13
14 #include <assert.h>
15 #include <string.h>
16
17 #include "bio_local.h"
18 #include <openssl/crypto.h>
19
20 #ifndef OPENSSL_NO_SOCK
21 #include <openssl/err.h>
22 #include <openssl/buffer.h>
23 #include "internal/thread_once.h"
24
25 CRYPTO_RWLOCK *bio_lookup_lock;
26 static CRYPTO_ONCE bio_lookup_init = CRYPTO_ONCE_STATIC_INIT;
27
28 /*
29 * Throughout this file and bio_local.h, the existence of the macro
30 * AI_PASSIVE is used to detect the availability of struct addrinfo,
31 * getnameinfo() and getaddrinfo(). If that macro doesn't exist,
32 * we use our own implementation instead, using gethostbyname,
33 * getservbyname and a few other.
34 */
35
36 /**********************************************************************
37 *
38 * Address structure
39 *
40 */
41
BIO_ADDR_new(void)42 BIO_ADDR *BIO_ADDR_new(void)
43 {
44 BIO_ADDR *ret = OPENSSL_zalloc(sizeof(*ret));
45
46 if (ret == NULL) {
47 BIOerr(BIO_F_BIO_ADDR_NEW, ERR_R_MALLOC_FAILURE);
48 return NULL;
49 }
50
51 ret->sa.sa_family = AF_UNSPEC;
52 return ret;
53 }
54
BIO_ADDR_free(BIO_ADDR * ap)55 void BIO_ADDR_free(BIO_ADDR *ap)
56 {
57 OPENSSL_free(ap);
58 }
59
BIO_ADDR_clear(BIO_ADDR * ap)60 void BIO_ADDR_clear(BIO_ADDR *ap)
61 {
62 memset(ap, 0, sizeof(*ap));
63 ap->sa.sa_family = AF_UNSPEC;
64 }
65
66 /*
67 * BIO_ADDR_make - non-public routine to fill a BIO_ADDR with the contents
68 * of a struct sockaddr.
69 */
BIO_ADDR_make(BIO_ADDR * ap,const struct sockaddr * sa)70 int BIO_ADDR_make(BIO_ADDR *ap, const struct sockaddr *sa)
71 {
72 if (sa->sa_family == AF_INET) {
73 memcpy(&(ap->s_in), sa, sizeof(struct sockaddr_in));
74 return 1;
75 }
76 #ifdef AF_INET6
77 if (sa->sa_family == AF_INET6) {
78 memcpy(&(ap->s_in6), sa, sizeof(struct sockaddr_in6));
79 return 1;
80 }
81 #endif
82 #ifdef AF_UNIX
83 if (sa->sa_family == AF_UNIX) {
84 memcpy(&(ap->s_un), sa, sizeof(struct sockaddr_un));
85 return 1;
86 }
87 #endif
88
89 return 0;
90 }
91
BIO_ADDR_rawmake(BIO_ADDR * ap,int family,const void * where,size_t wherelen,unsigned short port)92 int BIO_ADDR_rawmake(BIO_ADDR *ap, int family,
93 const void *where, size_t wherelen,
94 unsigned short port)
95 {
96 #ifdef AF_UNIX
97 if (family == AF_UNIX) {
98 if (wherelen + 1 > sizeof(ap->s_un.sun_path))
99 return 0;
100 memset(&ap->s_un, 0, sizeof(ap->s_un));
101 ap->s_un.sun_family = family;
102 strncpy(ap->s_un.sun_path, where, sizeof(ap->s_un.sun_path) - 1);
103 return 1;
104 }
105 #endif
106 if (family == AF_INET) {
107 if (wherelen != sizeof(struct in_addr))
108 return 0;
109 memset(&ap->s_in, 0, sizeof(ap->s_in));
110 ap->s_in.sin_family = family;
111 ap->s_in.sin_port = port;
112 ap->s_in.sin_addr = *(struct in_addr *)where;
113 return 1;
114 }
115 #ifdef AF_INET6
116 if (family == AF_INET6) {
117 if (wherelen != sizeof(struct in6_addr))
118 return 0;
119 memset(&ap->s_in6, 0, sizeof(ap->s_in6));
120 ap->s_in6.sin6_family = family;
121 ap->s_in6.sin6_port = port;
122 ap->s_in6.sin6_addr = *(struct in6_addr *)where;
123 return 1;
124 }
125 #endif
126
127 return 0;
128 }
129
BIO_ADDR_family(const BIO_ADDR * ap)130 int BIO_ADDR_family(const BIO_ADDR *ap)
131 {
132 return ap->sa.sa_family;
133 }
134
BIO_ADDR_rawaddress(const BIO_ADDR * ap,void * p,size_t * l)135 int BIO_ADDR_rawaddress(const BIO_ADDR *ap, void *p, size_t *l)
136 {
137 size_t len = 0;
138 const void *addrptr = NULL;
139
140 if (ap->sa.sa_family == AF_INET) {
141 len = sizeof(ap->s_in.sin_addr);
142 addrptr = &ap->s_in.sin_addr;
143 }
144 #ifdef AF_INET6
145 else if (ap->sa.sa_family == AF_INET6) {
146 len = sizeof(ap->s_in6.sin6_addr);
147 addrptr = &ap->s_in6.sin6_addr;
148 }
149 #endif
150 #ifdef AF_UNIX
151 else if (ap->sa.sa_family == AF_UNIX) {
152 len = strlen(ap->s_un.sun_path);
153 addrptr = &ap->s_un.sun_path;
154 }
155 #endif
156
157 if (addrptr == NULL)
158 return 0;
159
160 if (p != NULL) {
161 memcpy(p, addrptr, len);
162 }
163 if (l != NULL)
164 *l = len;
165
166 return 1;
167 }
168
BIO_ADDR_rawport(const BIO_ADDR * ap)169 unsigned short BIO_ADDR_rawport(const BIO_ADDR *ap)
170 {
171 if (ap->sa.sa_family == AF_INET)
172 return ap->s_in.sin_port;
173 #ifdef AF_INET6
174 if (ap->sa.sa_family == AF_INET6)
175 return ap->s_in6.sin6_port;
176 #endif
177 return 0;
178 }
179
180 /*-
181 * addr_strings - helper function to get host and service names
182 * @ap: the BIO_ADDR that has the input info
183 * @numeric: 0 if actual names should be returned, 1 if the numeric
184 * representation should be returned.
185 * @hostname: a pointer to a pointer to a memory area to store the
186 * host name or numeric representation. Unused if NULL.
187 * @service: a pointer to a pointer to a memory area to store the
188 * service name or numeric representation. Unused if NULL.
189 *
190 * The return value is 0 on failure, with the error code in the error
191 * stack, and 1 on success.
192 */
addr_strings(const BIO_ADDR * ap,int numeric,char ** hostname,char ** service)193 static int addr_strings(const BIO_ADDR *ap, int numeric,
194 char **hostname, char **service)
195 {
196 if (BIO_sock_init() != 1)
197 return 0;
198
199 if (1) {
200 #ifdef AI_PASSIVE
201 int ret = 0;
202 char host[NI_MAXHOST] = "", serv[NI_MAXSERV] = "";
203 int flags = 0;
204
205 if (numeric)
206 flags |= NI_NUMERICHOST | NI_NUMERICSERV;
207
208 if ((ret = getnameinfo(BIO_ADDR_sockaddr(ap),
209 BIO_ADDR_sockaddr_size(ap),
210 host, sizeof(host), serv, sizeof(serv),
211 flags)) != 0) {
212 # ifdef EAI_SYSTEM
213 if (ret == EAI_SYSTEM) {
214 SYSerr(SYS_F_GETNAMEINFO, get_last_socket_error());
215 BIOerr(BIO_F_ADDR_STRINGS, ERR_R_SYS_LIB);
216 } else
217 # endif
218 {
219 BIOerr(BIO_F_ADDR_STRINGS, ERR_R_SYS_LIB);
220 ERR_add_error_data(1, gai_strerror(ret));
221 }
222 return 0;
223 }
224
225 /* VMS getnameinfo() has a bug, it doesn't fill in serv, which
226 * leaves it with whatever garbage that happens to be there.
227 * However, we initialise serv with the empty string (serv[0]
228 * is therefore NUL), so it gets real easy to detect when things
229 * didn't go the way one might expect.
230 */
231 if (serv[0] == '\0') {
232 BIO_snprintf(serv, sizeof(serv), "%d",
233 ntohs(BIO_ADDR_rawport(ap)));
234 }
235
236 if (hostname != NULL)
237 *hostname = OPENSSL_strdup(host);
238 if (service != NULL)
239 *service = OPENSSL_strdup(serv);
240 } else {
241 #endif
242 if (hostname != NULL)
243 *hostname = OPENSSL_strdup(inet_ntoa(ap->s_in.sin_addr));
244 if (service != NULL) {
245 char serv[6]; /* port is 16 bits => max 5 decimal digits */
246 BIO_snprintf(serv, sizeof(serv), "%d", ntohs(ap->s_in.sin_port));
247 *service = OPENSSL_strdup(serv);
248 }
249 }
250
251 if ((hostname != NULL && *hostname == NULL)
252 || (service != NULL && *service == NULL)) {
253 if (hostname != NULL) {
254 OPENSSL_free(*hostname);
255 *hostname = NULL;
256 }
257 if (service != NULL) {
258 OPENSSL_free(*service);
259 *service = NULL;
260 }
261 BIOerr(BIO_F_ADDR_STRINGS, ERR_R_MALLOC_FAILURE);
262 return 0;
263 }
264
265 return 1;
266 }
267
BIO_ADDR_hostname_string(const BIO_ADDR * ap,int numeric)268 char *BIO_ADDR_hostname_string(const BIO_ADDR *ap, int numeric)
269 {
270 char *hostname = NULL;
271
272 if (addr_strings(ap, numeric, &hostname, NULL))
273 return hostname;
274
275 return NULL;
276 }
277
BIO_ADDR_service_string(const BIO_ADDR * ap,int numeric)278 char *BIO_ADDR_service_string(const BIO_ADDR *ap, int numeric)
279 {
280 char *service = NULL;
281
282 if (addr_strings(ap, numeric, NULL, &service))
283 return service;
284
285 return NULL;
286 }
287
BIO_ADDR_path_string(const BIO_ADDR * ap)288 char *BIO_ADDR_path_string(const BIO_ADDR *ap)
289 {
290 #ifdef AF_UNIX
291 if (ap->sa.sa_family == AF_UNIX)
292 return OPENSSL_strdup(ap->s_un.sun_path);
293 #endif
294 return NULL;
295 }
296
297 /*
298 * BIO_ADDR_sockaddr - non-public routine to return the struct sockaddr
299 * for a given BIO_ADDR. In reality, this is simply a type safe cast.
300 * The returned struct sockaddr is const, so it can't be tampered with.
301 */
BIO_ADDR_sockaddr(const BIO_ADDR * ap)302 const struct sockaddr *BIO_ADDR_sockaddr(const BIO_ADDR *ap)
303 {
304 return &(ap->sa);
305 }
306
307 /*
308 * BIO_ADDR_sockaddr_noconst - non-public function that does the same
309 * as BIO_ADDR_sockaddr, but returns a non-const. USE WITH CARE, as
310 * it allows you to tamper with the data (and thereby the contents
311 * of the input BIO_ADDR).
312 */
BIO_ADDR_sockaddr_noconst(BIO_ADDR * ap)313 struct sockaddr *BIO_ADDR_sockaddr_noconst(BIO_ADDR *ap)
314 {
315 return &(ap->sa);
316 }
317
318 /*
319 * BIO_ADDR_sockaddr_size - non-public function that returns the size
320 * of the struct sockaddr the BIO_ADDR is using. If the protocol family
321 * isn't set or is something other than AF_INET, AF_INET6 or AF_UNIX,
322 * the size of the BIO_ADDR type is returned.
323 */
BIO_ADDR_sockaddr_size(const BIO_ADDR * ap)324 socklen_t BIO_ADDR_sockaddr_size(const BIO_ADDR *ap)
325 {
326 if (ap->sa.sa_family == AF_INET)
327 return sizeof(ap->s_in);
328 #ifdef AF_INET6
329 if (ap->sa.sa_family == AF_INET6)
330 return sizeof(ap->s_in6);
331 #endif
332 #ifdef AF_UNIX
333 if (ap->sa.sa_family == AF_UNIX)
334 return sizeof(ap->s_un);
335 #endif
336 return sizeof(*ap);
337 }
338
339 /**********************************************************************
340 *
341 * Address info database
342 *
343 */
344
BIO_ADDRINFO_next(const BIO_ADDRINFO * bai)345 const BIO_ADDRINFO *BIO_ADDRINFO_next(const BIO_ADDRINFO *bai)
346 {
347 if (bai != NULL)
348 return bai->bai_next;
349 return NULL;
350 }
351
BIO_ADDRINFO_family(const BIO_ADDRINFO * bai)352 int BIO_ADDRINFO_family(const BIO_ADDRINFO *bai)
353 {
354 if (bai != NULL)
355 return bai->bai_family;
356 return 0;
357 }
358
BIO_ADDRINFO_socktype(const BIO_ADDRINFO * bai)359 int BIO_ADDRINFO_socktype(const BIO_ADDRINFO *bai)
360 {
361 if (bai != NULL)
362 return bai->bai_socktype;
363 return 0;
364 }
365
BIO_ADDRINFO_protocol(const BIO_ADDRINFO * bai)366 int BIO_ADDRINFO_protocol(const BIO_ADDRINFO *bai)
367 {
368 if (bai != NULL) {
369 if (bai->bai_protocol != 0)
370 return bai->bai_protocol;
371
372 #ifdef AF_UNIX
373 if (bai->bai_family == AF_UNIX)
374 return 0;
375 #endif
376
377 switch (bai->bai_socktype) {
378 case SOCK_STREAM:
379 return IPPROTO_TCP;
380 case SOCK_DGRAM:
381 return IPPROTO_UDP;
382 default:
383 break;
384 }
385 }
386 return 0;
387 }
388
389 /*
390 * BIO_ADDRINFO_sockaddr_size - non-public function that returns the size
391 * of the struct sockaddr inside the BIO_ADDRINFO.
392 */
BIO_ADDRINFO_sockaddr_size(const BIO_ADDRINFO * bai)393 socklen_t BIO_ADDRINFO_sockaddr_size(const BIO_ADDRINFO *bai)
394 {
395 if (bai != NULL)
396 return bai->bai_addrlen;
397 return 0;
398 }
399
400 /*
401 * BIO_ADDRINFO_sockaddr - non-public function that returns bai_addr
402 * as the struct sockaddr it is.
403 */
BIO_ADDRINFO_sockaddr(const BIO_ADDRINFO * bai)404 const struct sockaddr *BIO_ADDRINFO_sockaddr(const BIO_ADDRINFO *bai)
405 {
406 if (bai != NULL)
407 return bai->bai_addr;
408 return NULL;
409 }
410
BIO_ADDRINFO_address(const BIO_ADDRINFO * bai)411 const BIO_ADDR *BIO_ADDRINFO_address(const BIO_ADDRINFO *bai)
412 {
413 if (bai != NULL)
414 return (BIO_ADDR *)bai->bai_addr;
415 return NULL;
416 }
417
BIO_ADDRINFO_free(BIO_ADDRINFO * bai)418 void BIO_ADDRINFO_free(BIO_ADDRINFO *bai)
419 {
420 if (bai == NULL)
421 return;
422
423 #ifdef AI_PASSIVE
424 # ifdef AF_UNIX
425 # define _cond bai->bai_family != AF_UNIX
426 # else
427 # define _cond 1
428 # endif
429 if (_cond) {
430 freeaddrinfo(bai);
431 return;
432 }
433 #endif
434
435 /* Free manually when we know that addrinfo_wrap() was used.
436 * See further comment above addrinfo_wrap()
437 */
438 while (bai != NULL) {
439 BIO_ADDRINFO *next = bai->bai_next;
440 OPENSSL_free(bai->bai_addr);
441 OPENSSL_free(bai);
442 bai = next;
443 }
444 }
445
446 /**********************************************************************
447 *
448 * Service functions
449 *
450 */
451
452 /*-
453 * The specs in hostserv can take these forms:
454 *
455 * host:service => *host = "host", *service = "service"
456 * host:* => *host = "host", *service = NULL
457 * host: => *host = "host", *service = NULL
458 * :service => *host = NULL, *service = "service"
459 * *:service => *host = NULL, *service = "service"
460 *
461 * in case no : is present in the string, the result depends on
462 * hostserv_prio, as follows:
463 *
464 * when hostserv_prio == BIO_PARSE_PRIO_HOST
465 * host => *host = "host", *service untouched
466 *
467 * when hostserv_prio == BIO_PARSE_PRIO_SERV
468 * service => *host untouched, *service = "service"
469 *
470 */
BIO_parse_hostserv(const char * hostserv,char ** host,char ** service,enum BIO_hostserv_priorities hostserv_prio)471 int BIO_parse_hostserv(const char *hostserv, char **host, char **service,
472 enum BIO_hostserv_priorities hostserv_prio)
473 {
474 const char *h = NULL; size_t hl = 0;
475 const char *p = NULL; size_t pl = 0;
476
477 if (*hostserv == '[') {
478 if ((p = strchr(hostserv, ']')) == NULL)
479 goto spec_err;
480 h = hostserv + 1;
481 hl = p - h;
482 p++;
483 if (*p == '\0')
484 p = NULL;
485 else if (*p != ':')
486 goto spec_err;
487 else {
488 p++;
489 pl = strlen(p);
490 }
491 } else {
492 const char *p2 = strrchr(hostserv, ':');
493 p = strchr(hostserv, ':');
494
495 /*-
496 * Check for more than one colon. There are three possible
497 * interpretations:
498 * 1. IPv6 address with port number, last colon being separator.
499 * 2. IPv6 address only.
500 * 3. IPv6 address only if hostserv_prio == BIO_PARSE_PRIO_HOST,
501 * IPv6 address and port number if hostserv_prio == BIO_PARSE_PRIO_SERV
502 * Because of this ambiguity, we currently choose to make it an
503 * error.
504 */
505 if (p != p2)
506 goto amb_err;
507
508 if (p != NULL) {
509 h = hostserv;
510 hl = p - h;
511 p++;
512 pl = strlen(p);
513 } else if (hostserv_prio == BIO_PARSE_PRIO_HOST) {
514 h = hostserv;
515 hl = strlen(h);
516 } else {
517 p = hostserv;
518 pl = strlen(p);
519 }
520 }
521
522 if (p != NULL && strchr(p, ':'))
523 goto spec_err;
524
525 if (h != NULL && host != NULL) {
526 if (hl == 0
527 || (hl == 1 && h[0] == '*')) {
528 *host = NULL;
529 } else {
530 *host = OPENSSL_strndup(h, hl);
531 if (*host == NULL)
532 goto memerr;
533 }
534 }
535 if (p != NULL && service != NULL) {
536 if (pl == 0
537 || (pl == 1 && p[0] == '*')) {
538 *service = NULL;
539 } else {
540 *service = OPENSSL_strndup(p, pl);
541 if (*service == NULL)
542 goto memerr;
543 }
544 }
545
546 return 1;
547 amb_err:
548 BIOerr(BIO_F_BIO_PARSE_HOSTSERV, BIO_R_AMBIGUOUS_HOST_OR_SERVICE);
549 return 0;
550 spec_err:
551 BIOerr(BIO_F_BIO_PARSE_HOSTSERV, BIO_R_MALFORMED_HOST_OR_SERVICE);
552 return 0;
553 memerr:
554 BIOerr(BIO_F_BIO_PARSE_HOSTSERV, ERR_R_MALLOC_FAILURE);
555 return 0;
556 }
557
558 /* addrinfo_wrap is used to build our own addrinfo "chain".
559 * (it has only one entry, so calling it a chain may be a stretch)
560 * It should ONLY be called when getaddrinfo() and friends
561 * aren't available, OR when dealing with a non IP protocol
562 * family, such as AF_UNIX
563 *
564 * the return value is 1 on success, or 0 on failure, which
565 * only happens if a memory allocation error occurred.
566 */
addrinfo_wrap(int family,int socktype,const void * where,size_t wherelen,unsigned short port,BIO_ADDRINFO ** bai)567 static int addrinfo_wrap(int family, int socktype,
568 const void *where, size_t wherelen,
569 unsigned short port,
570 BIO_ADDRINFO **bai)
571 {
572 if ((*bai = OPENSSL_zalloc(sizeof(**bai))) == NULL) {
573 BIOerr(BIO_F_ADDRINFO_WRAP, ERR_R_MALLOC_FAILURE);
574 return 0;
575 }
576
577 (*bai)->bai_family = family;
578 (*bai)->bai_socktype = socktype;
579 if (socktype == SOCK_STREAM)
580 (*bai)->bai_protocol = IPPROTO_TCP;
581 if (socktype == SOCK_DGRAM)
582 (*bai)->bai_protocol = IPPROTO_UDP;
583 #ifdef AF_UNIX
584 if (family == AF_UNIX)
585 (*bai)->bai_protocol = 0;
586 #endif
587 {
588 /* Magic: We know that BIO_ADDR_sockaddr_noconst is really
589 just an advanced cast of BIO_ADDR* to struct sockaddr *
590 by the power of union, so while it may seem that we're
591 creating a memory leak here, we are not. It will be
592 all right. */
593 BIO_ADDR *addr = BIO_ADDR_new();
594 if (addr != NULL) {
595 BIO_ADDR_rawmake(addr, family, where, wherelen, port);
596 (*bai)->bai_addr = BIO_ADDR_sockaddr_noconst(addr);
597 }
598 }
599 (*bai)->bai_next = NULL;
600 if ((*bai)->bai_addr == NULL) {
601 BIO_ADDRINFO_free(*bai);
602 *bai = NULL;
603 return 0;
604 }
605 return 1;
606 }
607
DEFINE_RUN_ONCE_STATIC(do_bio_lookup_init)608 DEFINE_RUN_ONCE_STATIC(do_bio_lookup_init)
609 {
610 if (!OPENSSL_init_crypto(0, NULL))
611 return 0;
612 bio_lookup_lock = CRYPTO_THREAD_lock_new();
613 return bio_lookup_lock != NULL;
614 }
615
BIO_lookup(const char * host,const char * service,enum BIO_lookup_type lookup_type,int family,int socktype,BIO_ADDRINFO ** res)616 int BIO_lookup(const char *host, const char *service,
617 enum BIO_lookup_type lookup_type,
618 int family, int socktype, BIO_ADDRINFO **res)
619 {
620 return BIO_lookup_ex(host, service, lookup_type, family, socktype, 0, res);
621 }
622
623 /*-
624 * BIO_lookup_ex - look up the node and service you want to connect to.
625 * @node: the node you want to connect to.
626 * @service: the service you want to connect to.
627 * @lookup_type: declare intent with the result, client or server.
628 * @family: the address family you want to use. Use AF_UNSPEC for any, or
629 * AF_INET, AF_INET6 or AF_UNIX.
630 * @socktype: The socket type you want to use. Can be SOCK_STREAM, SOCK_DGRAM
631 * or 0 for all.
632 * @protocol: The protocol to use, e.g. IPPROTO_TCP or IPPROTO_UDP or 0 for all.
633 * Note that some platforms may not return IPPROTO_SCTP without
634 * explicitly requesting it (i.e. IPPROTO_SCTP may not be returned
635 * with 0 for the protocol)
636 * @res: Storage place for the resulting list of returned addresses
637 *
638 * This will do a lookup of the node and service that you want to connect to.
639 * It returns a linked list of different addresses you can try to connect to.
640 *
641 * When no longer needed you should call BIO_ADDRINFO_free() to free the result.
642 *
643 * The return value is 1 on success or 0 in case of error.
644 */
BIO_lookup_ex(const char * host,const char * service,int lookup_type,int family,int socktype,int protocol,BIO_ADDRINFO ** res)645 int BIO_lookup_ex(const char *host, const char *service, int lookup_type,
646 int family, int socktype, int protocol, BIO_ADDRINFO **res)
647 {
648 int ret = 0; /* Assume failure */
649
650 switch(family) {
651 case AF_INET:
652 #ifdef AF_INET6
653 case AF_INET6:
654 #endif
655 #ifdef AF_UNIX
656 case AF_UNIX:
657 #endif
658 #ifdef AF_UNSPEC
659 case AF_UNSPEC:
660 #endif
661 break;
662 default:
663 BIOerr(BIO_F_BIO_LOOKUP_EX, BIO_R_UNSUPPORTED_PROTOCOL_FAMILY);
664 return 0;
665 }
666
667 #ifdef AF_UNIX
668 if (family == AF_UNIX) {
669 if (addrinfo_wrap(family, socktype, host, strlen(host), 0, res))
670 return 1;
671 else
672 BIOerr(BIO_F_BIO_LOOKUP_EX, ERR_R_MALLOC_FAILURE);
673 return 0;
674 }
675 #endif
676
677 if (BIO_sock_init() != 1)
678 return 0;
679
680 if (1) {
681 #ifdef AI_PASSIVE
682 int gai_ret = 0, old_ret = 0;
683 struct addrinfo hints;
684
685 memset(&hints, 0, sizeof(hints));
686
687 hints.ai_family = family;
688 hints.ai_socktype = socktype;
689 hints.ai_protocol = protocol;
690 # ifdef AI_ADDRCONFIG
691 # ifdef AF_UNSPEC
692 if (host != NULL && family == AF_UNSPEC)
693 # endif
694 hints.ai_flags |= AI_ADDRCONFIG;
695 # endif
696
697 if (lookup_type == BIO_LOOKUP_SERVER)
698 hints.ai_flags |= AI_PASSIVE;
699
700 /* Note that |res| SHOULD be a 'struct addrinfo **' thanks to
701 * macro magic in bio_local.h
702 */
703 # if defined(AI_ADDRCONFIG) && defined(AI_NUMERICHOST)
704 retry:
705 # endif
706 switch ((gai_ret = getaddrinfo(host, service, &hints, res))) {
707 # ifdef EAI_SYSTEM
708 case EAI_SYSTEM:
709 SYSerr(SYS_F_GETADDRINFO, get_last_socket_error());
710 BIOerr(BIO_F_BIO_LOOKUP_EX, ERR_R_SYS_LIB);
711 break;
712 # endif
713 # ifdef EAI_MEMORY
714 case EAI_MEMORY:
715 BIOerr(BIO_F_BIO_LOOKUP_EX, ERR_R_MALLOC_FAILURE);
716 break;
717 # endif
718 case 0:
719 ret = 1; /* Success */
720 break;
721 default:
722 # if defined(AI_ADDRCONFIG) && defined(AI_NUMERICHOST)
723 if (hints.ai_flags & AI_ADDRCONFIG) {
724 hints.ai_flags &= ~AI_ADDRCONFIG;
725 hints.ai_flags |= AI_NUMERICHOST;
726 old_ret = gai_ret;
727 goto retry;
728 }
729 # endif
730 BIOerr(BIO_F_BIO_LOOKUP_EX, ERR_R_SYS_LIB);
731 ERR_add_error_data(1, gai_strerror(old_ret ? old_ret : gai_ret));
732 break;
733 }
734 } else {
735 #endif
736 const struct hostent *he;
737 /*
738 * Because struct hostent is defined for 32-bit pointers only with
739 * VMS C, we need to make sure that '&he_fallback_address' and
740 * '&he_fallback_addresses' are 32-bit pointers
741 */
742 #if defined(OPENSSL_SYS_VMS) && defined(__DECC)
743 # pragma pointer_size save
744 # pragma pointer_size 32
745 #endif
746 /* Windows doesn't seem to have in_addr_t */
747 #if defined(OPENSSL_SYS_WINDOWS) || defined(OPENSSL_SYS_MSDOS)
748 static uint32_t he_fallback_address;
749 static const char *he_fallback_addresses[] =
750 { (char *)&he_fallback_address, NULL };
751 #else
752 static in_addr_t he_fallback_address;
753 static const char *he_fallback_addresses[] =
754 { (char *)&he_fallback_address, NULL };
755 #endif
756 static const struct hostent he_fallback =
757 { NULL, NULL, AF_INET, sizeof(he_fallback_address),
758 (char **)&he_fallback_addresses };
759 #if defined(OPENSSL_SYS_VMS) && defined(__DECC)
760 # pragma pointer_size restore
761 #endif
762
763 struct servent *se;
764 /* Apparently, on WIN64, s_proto and s_port have traded places... */
765 #ifdef _WIN64
766 struct servent se_fallback = { NULL, NULL, NULL, 0 };
767 #else
768 struct servent se_fallback = { NULL, NULL, 0, NULL };
769 #endif
770
771 if (!RUN_ONCE(&bio_lookup_init, do_bio_lookup_init)) {
772 BIOerr(BIO_F_BIO_LOOKUP_EX, ERR_R_MALLOC_FAILURE);
773 ret = 0;
774 goto err;
775 }
776
777 CRYPTO_THREAD_write_lock(bio_lookup_lock);
778 he_fallback_address = INADDR_ANY;
779 if (host == NULL) {
780 he = &he_fallback;
781 switch(lookup_type) {
782 case BIO_LOOKUP_CLIENT:
783 he_fallback_address = INADDR_LOOPBACK;
784 break;
785 case BIO_LOOKUP_SERVER:
786 he_fallback_address = INADDR_ANY;
787 break;
788 default:
789 /* We forgot to handle a lookup type! */
790 assert("We forgot to handle a lookup type!" == NULL);
791 BIOerr(BIO_F_BIO_LOOKUP_EX, ERR_R_INTERNAL_ERROR);
792 ret = 0;
793 goto err;
794 }
795 } else {
796 he = gethostbyname(host);
797
798 if (he == NULL) {
799 #ifndef OPENSSL_SYS_WINDOWS
800 /*
801 * This might be misleading, because h_errno is used as if
802 * it was errno. To minimize mixup add 1000. Underlying
803 * reason for this is that hstrerror is declared obsolete,
804 * not to mention that a) h_errno is not always guaranteed
805 * to be meaningless; b) hstrerror can reside in yet another
806 * library, linking for sake of hstrerror is an overkill;
807 * c) this path is not executed on contemporary systems
808 * anyway [above getaddrinfo/gai_strerror is]. We just let
809 * system administrator figure this out...
810 */
811 # if defined(OPENSSL_SYS_VXWORKS)
812 /* h_errno doesn't exist on VxWorks */
813 SYSerr(SYS_F_GETHOSTBYNAME, 1000 );
814 # else
815 SYSerr(SYS_F_GETHOSTBYNAME, 1000 + h_errno);
816 # endif
817 #else
818 SYSerr(SYS_F_GETHOSTBYNAME, WSAGetLastError());
819 #endif
820 ret = 0;
821 goto err;
822 }
823 }
824
825 if (service == NULL) {
826 se_fallback.s_port = 0;
827 se_fallback.s_proto = NULL;
828 se = &se_fallback;
829 } else {
830 char *endp = NULL;
831 long portnum = strtol(service, &endp, 10);
832
833 /*
834 * Because struct servent is defined for 32-bit pointers only with
835 * VMS C, we need to make sure that 'proto' is a 32-bit pointer.
836 */
837 #if defined(OPENSSL_SYS_VMS) && defined(__DECC)
838 # pragma pointer_size save
839 # pragma pointer_size 32
840 #endif
841 char *proto = NULL;
842 #if defined(OPENSSL_SYS_VMS) && defined(__DECC)
843 # pragma pointer_size restore
844 #endif
845
846 switch (socktype) {
847 case SOCK_STREAM:
848 proto = "tcp";
849 break;
850 case SOCK_DGRAM:
851 proto = "udp";
852 break;
853 }
854
855 if (endp != service && *endp == '\0'
856 && portnum > 0 && portnum < 65536) {
857 se_fallback.s_port = htons((unsigned short)portnum);
858 se_fallback.s_proto = proto;
859 se = &se_fallback;
860 } else if (endp == service) {
861 se = getservbyname(service, proto);
862
863 if (se == NULL) {
864 #ifndef OPENSSL_SYS_WINDOWS
865 SYSerr(SYS_F_GETSERVBYNAME, errno);
866 #else
867 SYSerr(SYS_F_GETSERVBYNAME, WSAGetLastError());
868 #endif
869 goto err;
870 }
871 } else {
872 BIOerr(BIO_F_BIO_LOOKUP_EX, BIO_R_MALFORMED_HOST_OR_SERVICE);
873 goto err;
874 }
875 }
876
877 *res = NULL;
878
879 {
880 /*
881 * Because hostent::h_addr_list is an array of 32-bit pointers with VMS C,
882 * we must make sure our iterator designates the same element type, hence
883 * the pointer size dance.
884 */
885 #if defined(OPENSSL_SYS_VMS) && defined(__DECC)
886 # pragma pointer_size save
887 # pragma pointer_size 32
888 #endif
889 char **addrlistp;
890 #if defined(OPENSSL_SYS_VMS) && defined(__DECC)
891 # pragma pointer_size restore
892 #endif
893 size_t addresses;
894 BIO_ADDRINFO *tmp_bai = NULL;
895
896 /* The easiest way to create a linked list from an
897 array is to start from the back */
898 for(addrlistp = he->h_addr_list; *addrlistp != NULL;
899 addrlistp++)
900 ;
901
902 for(addresses = addrlistp - he->h_addr_list;
903 addrlistp--, addresses-- > 0; ) {
904 if (!addrinfo_wrap(he->h_addrtype, socktype,
905 *addrlistp, he->h_length,
906 se->s_port, &tmp_bai))
907 goto addrinfo_malloc_err;
908 tmp_bai->bai_next = *res;
909 *res = tmp_bai;
910 continue;
911 addrinfo_malloc_err:
912 BIO_ADDRINFO_free(*res);
913 *res = NULL;
914 BIOerr(BIO_F_BIO_LOOKUP_EX, ERR_R_MALLOC_FAILURE);
915 ret = 0;
916 goto err;
917 }
918
919 ret = 1;
920 }
921 err:
922 CRYPTO_THREAD_unlock(bio_lookup_lock);
923 }
924
925 return ret;
926 }
927
928 #endif /* OPENSSL_NO_SOCK */
929