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_local.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
21CRYPTO_RWLOCK *bio_lookup_lock;
22static CRYPTO_ONCE bio_lookup_init = CRYPTO_ONCE_STATIC_INIT;
23
24/*
25 * Throughout this file and bio_local.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
38BIO_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
51void BIO_ADDR_free(BIO_ADDR *ap)
52{
53 OPENSSL_free(ap);
54}
55
56void 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 */
66int 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
88int 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
126int BIO_ADDR_family(const BIO_ADDR *ap)
127{
128 return ap->sa.sa_family;
129}
130
131int 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
165unsigned 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 */
189static 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
265char *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
275char *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
285char *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 */
299const 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 */
310struct 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 */
321socklen_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
342const BIO_ADDRINFO *BIO_ADDRINFO_next(const BIO_ADDRINFO *bai)
343{
344 if (bai != NULL)
345 return bai->bai_next;
346 return NULL;
347}
348
349int BIO_ADDRINFO_family(const BIO_ADDRINFO *bai)
350{
351 if (bai != NULL)
352 return bai->bai_family;
353 return 0;
354}
355
356int BIO_ADDRINFO_socktype(const BIO_ADDRINFO *bai)
357{
358 if (bai != NULL)
359 return bai->bai_socktype;
360 return 0;
361}
362
363int 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 */
390socklen_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 */
401const struct sockaddr *BIO_ADDRINFO_sockaddr(const BIO_ADDRINFO *bai)
402{
403 if (bai != NULL)
404 return bai->bai_addr;
405 return NULL;
406}
407
408const 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
415void 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 */
468int 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 */
564static 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
605DEFINE_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
613int 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 */
642int 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_local.h
699 */
700# if defined(AI_ADDRCONFIG) && defined(AI_NUMERICHOST)
701 retry:
702# endif
703 switch ((gai_ret = getaddrinfo(host, service, &hints, res))) {
704# ifdef EAI_SYSTEM
705 case EAI_SYSTEM:
706 ERR_raise_data(ERR_LIB_SYS, get_last_socket_error(),
707 "calling getaddrinfo()");
708 BIOerr(BIO_F_BIO_LOOKUP_EX, ERR_R_SYS_LIB);
709 break;
710# endif
711# ifdef EAI_MEMORY
712 case EAI_MEMORY:
713 BIOerr(BIO_F_BIO_LOOKUP_EX, ERR_R_MALLOC_FAILURE);
714 break;
715# endif
716 case 0:
717 ret = 1; /* Success */
718 break;
719 default:
720# if defined(AI_ADDRCONFIG) && defined(AI_NUMERICHOST)
721 if (hints.ai_flags & AI_ADDRCONFIG) {
722 hints.ai_flags &= ~AI_ADDRCONFIG;
723 hints.ai_flags |= AI_NUMERICHOST;
724 old_ret = gai_ret;
725 goto retry;
726 }
727# endif
728 BIOerr(BIO_F_BIO_LOOKUP_EX, ERR_R_SYS_LIB);
729 ERR_add_error_data(1, gai_strerror(old_ret ? old_ret : gai_ret));
730 break;
731 }
732 } else {
733#endif
734 const struct hostent *he;
735/*
736 * Because struct hostent is defined for 32-bit pointers only with
737 * VMS C, we need to make sure that '&he_fallback_address' and
738 * '&he_fallback_addresses' are 32-bit pointers
739 */
740#if defined(OPENSSL_SYS_VMS) && defined(__DECC)
741# pragma pointer_size save
742# pragma pointer_size 32
743#endif
744 /* Windows doesn't seem to have in_addr_t */
745#ifdef OPENSSL_SYS_WINDOWS
746 static uint32_t he_fallback_address;
747 static const char *he_fallback_addresses[] =
748 { (char *)&he_fallback_address, NULL };
749#else
750 static in_addr_t he_fallback_address;
751 static const char *he_fallback_addresses[] =
752 { (char *)&he_fallback_address, NULL };
753#endif
754 static const struct hostent he_fallback =
755 { NULL, NULL, AF_INET, sizeof(he_fallback_address),
756 (char **)&he_fallback_addresses };
757#if defined(OPENSSL_SYS_VMS) && defined(__DECC)
758# pragma pointer_size restore
759#endif
760
761 struct servent *se;
762 /* Apparently, on WIN64, s_proto and s_port have traded places... */
763#ifdef _WIN64
764 struct servent se_fallback = { NULL, NULL, NULL, 0 };
765#else
766 struct servent se_fallback = { NULL, NULL, 0, NULL };
767#endif
768
769 if (!RUN_ONCE(&bio_lookup_init, do_bio_lookup_init)) {
770 BIOerr(BIO_F_BIO_LOOKUP_EX, ERR_R_MALLOC_FAILURE);
771 ret = 0;
772 goto err;
773 }
774
775 CRYPTO_THREAD_write_lock(bio_lookup_lock);
776 he_fallback_address = INADDR_ANY;
777 if (host == NULL) {
778 he = &he_fallback;
779 switch(lookup_type) {
780 case BIO_LOOKUP_CLIENT:
781 he_fallback_address = INADDR_LOOPBACK;
782 break;
783 case BIO_LOOKUP_SERVER:
784 he_fallback_address = INADDR_ANY;
785 break;
786 default:
787 /* We forgot to handle a lookup type! */
788 assert("We forgot to handle a lookup type!" == NULL);
789 BIOerr(BIO_F_BIO_LOOKUP_EX, ERR_R_INTERNAL_ERROR);
790 ret = 0;
791 goto err;
792 }
793 } else {
794 he = gethostbyname(host);
795
796 if (he == NULL) {
797#ifndef OPENSSL_SYS_WINDOWS
798 /*
799 * This might be misleading, because h_errno is used as if
800 * it was errno. To minimize mixup add 1000. Underlying
801 * reason for this is that hstrerror is declared obsolete,
802 * not to mention that a) h_errno is not always guaranteed
803 * to be meaningless; b) hstrerror can reside in yet another
804 * library, linking for sake of hstrerror is an overkill;
805 * c) this path is not executed on contemporary systems
806 * anyway [above getaddrinfo/gai_strerror is]. We just let
807 * system administrator figure this out...
808 */
809# if defined(OPENSSL_SYS_VXWORKS)
810 /* h_errno doesn't exist on VxWorks */
811 ERR_raise_data(ERR_LIB_SYS, 1000,
812 "calling gethostbyname()");
813# else
814 ERR_raise_data(ERR_LIB_SYS, 1000 + h_errno,
815 "calling gethostbyname()");
816# endif
817#else
818 ERR_raise_data(ERR_LIB_SYS, get_last_socket_error(),
819 "calling gethostbyname()");
820#endif
821 ret = 0;
822 goto err;
823 }
824 }
825
826 if (service == NULL) {
827 se_fallback.s_port = 0;
828 se_fallback.s_proto = NULL;
829 se = &se_fallback;
830 } else {
831 char *endp = NULL;
832 long portnum = strtol(service, &endp, 10);
833
834/*
835 * Because struct servent is defined for 32-bit pointers only with
836 * VMS C, we need to make sure that 'proto' is a 32-bit pointer.
837 */
838#if defined(OPENSSL_SYS_VMS) && defined(__DECC)
839# pragma pointer_size save
840# pragma pointer_size 32
841#endif
842 char *proto = NULL;
843#if defined(OPENSSL_SYS_VMS) && defined(__DECC)
844# pragma pointer_size restore
845#endif
846
847 switch (socktype) {
848 case SOCK_STREAM:
849 proto = "tcp";
850 break;
851 case SOCK_DGRAM:
852 proto = "udp";
853 break;
854 }
855
856 if (endp != service && *endp == '\0'
857 && portnum > 0 && portnum < 65536) {
858 se_fallback.s_port = htons((unsigned short)portnum);
859 se_fallback.s_proto = proto;
860 se = &se_fallback;
861 } else if (endp == service) {
862 se = getservbyname(service, proto);
863
864 if (se == NULL) {
865 ERR_raise_data(ERR_LIB_SYS, get_last_socket_error(),
866 "calling getservbyname()");
867 goto err;
868 }
869 } else {
870 BIOerr(BIO_F_BIO_LOOKUP_EX, BIO_R_MALFORMED_HOST_OR_SERVICE);
871 goto err;
872 }
873 }
874
875 *res = NULL;
876
877 {
878/*
879 * Because hostent::h_addr_list is an array of 32-bit pointers with VMS C,
880 * we must make sure our iterator designates the same element type, hence
881 * the pointer size dance.
882 */
883#if defined(OPENSSL_SYS_VMS) && defined(__DECC)
884# pragma pointer_size save
885# pragma pointer_size 32
886#endif
887 char **addrlistp;
888#if defined(OPENSSL_SYS_VMS) && defined(__DECC)
889# pragma pointer_size restore
890#endif
891 size_t addresses;
892 BIO_ADDRINFO *tmp_bai = NULL;
893
894 /* The easiest way to create a linked list from an
895 array is to start from the back */
896 for(addrlistp = he->h_addr_list; *addrlistp != NULL;
897 addrlistp++)
898 ;
899
900 for(addresses = addrlistp - he->h_addr_list;
901 addrlistp--, addresses-- > 0; ) {
902 if (!addrinfo_wrap(he->h_addrtype, socktype,
903 *addrlistp, he->h_length,
904 se->s_port, &tmp_bai))
905 goto addrinfo_malloc_err;
906 tmp_bai->bai_next = *res;
907 *res = tmp_bai;
908 continue;
909 addrinfo_malloc_err:
910 BIO_ADDRINFO_free(*res);
911 *res = NULL;
912 BIOerr(BIO_F_BIO_LOOKUP_EX, ERR_R_MALLOC_FAILURE);
913 ret = 0;
914 goto err;
915 }
916
917 ret = 1;
918 }
919 err:
920 CRYPTO_THREAD_unlock(bio_lookup_lock);
921 }
922
923 return ret;
924}
925
926#endif /* OPENSSL_NO_SOCK */
927