crypto/bio/b_addr.c

   1 /*
   2  * Copyright 2016-2021 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 #ifndef _GNU_SOURCE
  11 # define _GNU_SOURCE
  12 #endif
  13
  14 /*
  15  * VC configurations may define UNICODE, to indicate to the C RTL that
  16  * WCHAR functions are preferred.
  17  * This affects functions like gai_strerror(), which is implemented as
  18  * an alias macro for gai_strerrorA() (which returns a const char *) or
  19  * gai_strerrorW() (which returns a const WCHAR *).  This source file
  20  * assumes POSIX declarations, so prefer the non-UNICODE definitions.
  21  */
  22 #undef UNICODE
  23
  24 #include <assert.h>
  25 #include <string.h>
  26
  27 #include "bio_local.h"
  28 #include <openssl/crypto.h>
  29
  30 #ifndef OPENSSL_NO_SOCK
  31 #include <openssl/err.h>
  32 #include <openssl/buffer.h>
  33 #include "internal/thread_once.h"
  34
  35 CRYPTO_RWLOCK *bio_lookup_lock;
  36 static CRYPTO_ONCE bio_lookup_init = CRYPTO_ONCE_STATIC_INIT;
  37
  38 /*
  39  * Throughout this file and bio_local.h, the existence of the macro
  40  * AI_PASSIVE is used to detect the availability of struct addrinfo,
  41  * getnameinfo() and getaddrinfo().  If that macro doesn't exist,
  42  * we use our own implementation instead, using gethostbyname,
  43  * getservbyname and a few other.
  44  */
  45
  46 /**********************************************************************
  47  *
  48  * Address structure
  49  *
  50  */
  51
  52 BIO_ADDR *BIO_ADDR_new(void)
  53 {
  54     BIO_ADDR *ret = OPENSSL_zalloc(sizeof(*ret));
  55
  56     if (ret == NULL) {
  57         ERR_raise(ERR_LIB_BIO, ERR_R_MALLOC_FAILURE);
  58         return NULL;
  59     }
  60
  61     ret->sa.sa_family = AF_UNSPEC;
  62     return ret;
  63 }
  64
  65 void BIO_ADDR_free(BIO_ADDR *ap)
  66 {
  67     OPENSSL_free(ap);
  68 }
  69
  70 void BIO_ADDR_clear(BIO_ADDR *ap)
  71 {
  72     memset(ap, 0, sizeof(*ap));
  73     ap->sa.sa_family = AF_UNSPEC;
  74 }
  75
  76 /*
  77  * BIO_ADDR_make - non-public routine to fill a BIO_ADDR with the contents
  78  * of a struct sockaddr.
  79  */
  80 int BIO_ADDR_make(BIO_ADDR *ap, const struct sockaddr *sa)
  81 {
  82     if (sa->sa_family == AF_INET) {
  83         memcpy(&(ap->s_in), sa, sizeof(struct sockaddr_in));
  84         return 1;
  85     }
  86 #ifdef AF_INET6
  87     if (sa->sa_family == AF_INET6) {
  88         memcpy(&(ap->s_in6), sa, sizeof(struct sockaddr_in6));
  89         return 1;
  90     }
  91 #endif
  92 #ifdef AF_UNIX
  93     if (sa->sa_family == AF_UNIX) {
  94         memcpy(&(ap->s_un), sa, sizeof(struct sockaddr_un));
  95         return 1;
  96     }
  97 #endif
  98
  99     return 0;
 100 }
 101
 102 int BIO_ADDR_rawmake(BIO_ADDR *ap, int family,
 103                      const void *where, size_t wherelen,
 104                      unsigned short port)
 105 {
 106 #ifdef AF_UNIX
 107     if (family == AF_UNIX) {
 108         if (wherelen + 1 > sizeof(ap->s_un.sun_path))
 109             return 0;
 110         memset(&ap->s_un, 0, sizeof(ap->s_un));
 111         ap->s_un.sun_family = family;
 112         strncpy(ap->s_un.sun_path, where, sizeof(ap->s_un.sun_path) - 1);
 113         return 1;
 114     }
 115 #endif
 116     if (family == AF_INET) {
 117         if (wherelen != sizeof(struct in_addr))
 118             return 0;
 119         memset(&ap->s_in, 0, sizeof(ap->s_in));
 120         ap->s_in.sin_family = family;
 121         ap->s_in.sin_port = port;
 122         ap->s_in.sin_addr = *(struct in_addr *)where;
 123         return 1;
 124     }
 125 #ifdef AF_INET6
 126     if (family == AF_INET6) {
 127         if (wherelen != sizeof(struct in6_addr))
 128             return 0;
 129         memset(&ap->s_in6, 0, sizeof(ap->s_in6));
 130         ap->s_in6.sin6_family = family;
 131         ap->s_in6.sin6_port = port;
 132         ap->s_in6.sin6_addr = *(struct in6_addr *)where;
 133         return 1;
 134     }
 135 #endif
 136
 137     return 0;
 138 }
 139
 140 int BIO_ADDR_family(const BIO_ADDR *ap)
 141 {
 142     return ap->sa.sa_family;
 143 }
 144
 145 int BIO_ADDR_rawaddress(const BIO_ADDR *ap, void *p, size_t *l)
 146 {
 147     size_t len = 0;
 148     const void *addrptr = NULL;
 149
 150     if (ap->sa.sa_family == AF_INET) {
 151         len = sizeof(ap->s_in.sin_addr);
 152         addrptr = &ap->s_in.sin_addr;
 153     }
 154 #ifdef AF_INET6
 155     else if (ap->sa.sa_family == AF_INET6) {
 156         len = sizeof(ap->s_in6.sin6_addr);
 157         addrptr = &ap->s_in6.sin6_addr;
 158     }
 159 #endif
 160 #ifdef AF_UNIX
 161     else if (ap->sa.sa_family == AF_UNIX) {
 162         len = strlen(ap->s_un.sun_path);
 163         addrptr = &ap->s_un.sun_path;
 164     }
 165 #endif
 166
 167     if (addrptr == NULL)
 168         return 0;
 169
 170     if (p != NULL) {
 171         memcpy(p, addrptr, len);
 172     }
 173     if (l != NULL)
 174         *l = len;
 175
 176     return 1;
 177 }
 178
 179 unsigned short BIO_ADDR_rawport(const BIO_ADDR *ap)
 180 {
 181     if (ap->sa.sa_family == AF_INET)
 182         return ap->s_in.sin_port;
 183 #ifdef AF_INET6
 184     if (ap->sa.sa_family == AF_INET6)
 185         return ap->s_in6.sin6_port;
 186 #endif
 187     return 0;
 188 }
 189
 190 /*-
 191  * addr_strings - helper function to get host and service names
 192  * @ap: the BIO_ADDR that has the input info
 193  * @numeric: 0 if actual names should be returned, 1 if the numeric
 194  * representation should be returned.
 195  * @hostname: a pointer to a pointer to a memory area to store the
 196  * host name or numeric representation.  Unused if NULL.
 197  * @service: a pointer to a pointer to a memory area to store the
 198  * service name or numeric representation.  Unused if NULL.
 199  *
 200  * The return value is 0 on failure, with the error code in the error
 201  * stack, and 1 on success.
 202  */
 203 static int addr_strings(const BIO_ADDR *ap, int numeric,
 204                         char **hostname, char **service)
 205 {
 206     if (BIO_sock_init() != 1)
 207         return 0;
 208
 209     if (1) {
 210 #ifdef AI_PASSIVE
 211         int ret = 0;
 212         char host[NI_MAXHOST] = "", serv[NI_MAXSERV] = "";
 213         int flags = 0;
 214
 215         if (numeric)
 216             flags |= NI_NUMERICHOST | NI_NUMERICSERV;
 217
 218         if ((ret = getnameinfo(BIO_ADDR_sockaddr(ap),
 219                                BIO_ADDR_sockaddr_size(ap),
 220                                host, sizeof(host), serv, sizeof(serv),
 221                                flags)) != 0) {
 222 # ifdef EAI_SYSTEM
 223             if (ret == EAI_SYSTEM) {
 224                 ERR_raise_data(ERR_LIB_SYS, get_last_socket_error(),
 225                                "calling getnameinfo()");
 226             } else
 227 # endif
 228             {
 229                 ERR_raise_data(ERR_LIB_BIO, ERR_R_SYS_LIB, gai_strerror(ret));
 230             }
 231             return 0;
 232         }
 233
 234         /* VMS getnameinfo() has a bug, it doesn't fill in serv, which
 235          * leaves it with whatever garbage that happens to be there.
 236          * However, we initialise serv with the empty string (serv[0]
 237          * is therefore NUL), so it gets real easy to detect when things
 238          * didn't go the way one might expect.
 239          */
 240         if (serv[0] == '\0') {
 241             BIO_snprintf(serv, sizeof(serv), "%d",
 242                          ntohs(BIO_ADDR_rawport(ap)));
 243         }
 244
 245         if (hostname != NULL)
 246             *hostname = OPENSSL_strdup(host);
 247         if (service != NULL)
 248             *service = OPENSSL_strdup(serv);
 249     } else {
 250 #endif
 251         if (hostname != NULL)
 252             *hostname = OPENSSL_strdup(inet_ntoa(ap->s_in.sin_addr));
 253         if (service != NULL) {
 254             char serv[6];        /* port is 16 bits => max 5 decimal digits */
 255             BIO_snprintf(serv, sizeof(serv), "%d", ntohs(ap->s_in.sin_port));
 256             *service = OPENSSL_strdup(serv);
 257         }
 258     }
 259
 260     if ((hostname != NULL && *hostname == NULL)
 261             || (service != NULL && *service == NULL)) {
 262         if (hostname != NULL) {
 263             OPENSSL_free(*hostname);
 264             *hostname = NULL;
 265         }
 266         if (service != NULL) {
 267             OPENSSL_free(*service);
 268             *service = NULL;
 269         }
 270         ERR_raise(ERR_LIB_BIO, ERR_R_MALLOC_FAILURE);
 271         return 0;
 272     }
 273
 274     return 1;
 275 }
 276
 277 char *BIO_ADDR_hostname_string(const BIO_ADDR *ap, int numeric)
 278 {
 279     char *hostname = NULL;
 280
 281     if (addr_strings(ap, numeric, &hostname, NULL))
 282         return hostname;
 283
 284     return NULL;
 285 }
 286
 287 char *BIO_ADDR_service_string(const BIO_ADDR *ap, int numeric)
 288 {
 289     char *service = NULL;
 290
 291     if (addr_strings(ap, numeric, NULL, &service))
 292         return service;
 293
 294     return NULL;
 295 }
 296
 297 char *BIO_ADDR_path_string(const BIO_ADDR *ap)
 298 {
 299 #ifdef AF_UNIX
 300     if (ap->sa.sa_family == AF_UNIX)
 301         return OPENSSL_strdup(ap->s_un.sun_path);
 302 #endif
 303     return NULL;
 304 }
 305
 306 /*
 307  * BIO_ADDR_sockaddr - non-public routine to return the struct sockaddr
 308  * for a given BIO_ADDR.  In reality, this is simply a type safe cast.
 309  * The returned struct sockaddr is const, so it can't be tampered with.
 310  */
 311 const struct sockaddr *BIO_ADDR_sockaddr(const BIO_ADDR *ap)
 312 {
 313     return &(ap->sa);
 314 }
 315
 316 /*
 317  * BIO_ADDR_sockaddr_noconst - non-public function that does the same
 318  * as BIO_ADDR_sockaddr, but returns a non-const.  USE WITH CARE, as
 319  * it allows you to tamper with the data (and thereby the contents
 320  * of the input BIO_ADDR).
 321  */
 322 struct sockaddr *BIO_ADDR_sockaddr_noconst(BIO_ADDR *ap)
 323 {
 324     return &(ap->sa);
 325 }
 326
 327 /*
 328  * BIO_ADDR_sockaddr_size - non-public function that returns the size
 329  * of the struct sockaddr the BIO_ADDR is using.  If the protocol family
 330  * isn't set or is something other than AF_INET, AF_INET6 or AF_UNIX,
 331  * the size of the BIO_ADDR type is returned.
 332  */
 333 socklen_t BIO_ADDR_sockaddr_size(const BIO_ADDR *ap)
 334 {
 335     if (ap->sa.sa_family == AF_INET)
 336         return sizeof(ap->s_in);
 337 #ifdef AF_INET6
 338     if (ap->sa.sa_family == AF_INET6)
 339         return sizeof(ap->s_in6);
 340 #endif
 341 #ifdef AF_UNIX
 342     if (ap->sa.sa_family == AF_UNIX)
 343         return sizeof(ap->s_un);
 344 #endif
 345     return sizeof(*ap);
 346 }
 347
 348 /**********************************************************************
 349  *
 350  * Address info database
 351  *
 352  */
 353
 354 const BIO_ADDRINFO *BIO_ADDRINFO_next(const BIO_ADDRINFO *bai)
 355 {
 356     if (bai != NULL)
 357         return bai->bai_next;
 358     return NULL;
 359 }
 360
 361 int BIO_ADDRINFO_family(const BIO_ADDRINFO *bai)
 362 {
 363     if (bai != NULL)
 364         return bai->bai_family;
 365     return 0;
 366 }
 367
 368 int BIO_ADDRINFO_socktype(const BIO_ADDRINFO *bai)
 369 {
 370     if (bai != NULL)
 371         return bai->bai_socktype;
 372     return 0;
 373 }
 374
 375 int BIO_ADDRINFO_protocol(const BIO_ADDRINFO *bai)
 376 {
 377     if (bai != NULL) {
 378         if (bai->bai_protocol != 0)
 379             return bai->bai_protocol;
 380
 381 #ifdef AF_UNIX
 382         if (bai->bai_family == AF_UNIX)
 383             return 0;
 384 #endif
 385
 386         switch (bai->bai_socktype) {
 387         case SOCK_STREAM:
 388             return IPPROTO_TCP;
 389         case SOCK_DGRAM:
 390             return IPPROTO_UDP;
 391         default:
 392             break;
 393         }
 394     }
 395     return 0;
 396 }
 397
 398 /*
 399  * BIO_ADDRINFO_sockaddr_size - non-public function that returns the size
 400  * of the struct sockaddr inside the BIO_ADDRINFO.
 401  */
 402 socklen_t BIO_ADDRINFO_sockaddr_size(const BIO_ADDRINFO *bai)
 403 {
 404     if (bai != NULL)
 405         return bai->bai_addrlen;
 406     return 0;
 407 }
 408
 409 /*
 410  * BIO_ADDRINFO_sockaddr - non-public function that returns bai_addr
 411  * as the struct sockaddr it is.
 412  */
 413 const struct sockaddr *BIO_ADDRINFO_sockaddr(const BIO_ADDRINFO *bai)
 414 {
 415     if (bai != NULL)
 416         return bai->bai_addr;
 417     return NULL;
 418 }
 419
 420 const BIO_ADDR *BIO_ADDRINFO_address(const BIO_ADDRINFO *bai)
 421 {
 422     if (bai != NULL)
 423         return (BIO_ADDR *)bai->bai_addr;
 424     return NULL;
 425 }
 426
 427 void BIO_ADDRINFO_free(BIO_ADDRINFO *bai)
 428 {
 429     if (bai == NULL)
 430         return;
 431
 432 #ifdef AI_PASSIVE
 433 # ifdef AF_UNIX
 434 #  define _cond bai->bai_family != AF_UNIX
 435 # else
 436 #  define _cond 1
 437 # endif
 438     if (_cond) {
 439         freeaddrinfo(bai);
 440         return;
 441     }
 442 #endif
 443
 444     /* Free manually when we know that addrinfo_wrap() was used.
 445      * See further comment above addrinfo_wrap()
 446      */
 447     while (bai != NULL) {
 448         BIO_ADDRINFO *next = bai->bai_next;
 449         OPENSSL_free(bai->bai_addr);
 450         OPENSSL_free(bai);
 451         bai = next;
 452     }
 453 }
 454
 455 /**********************************************************************
 456  *
 457  * Service functions
 458  *
 459  */
 460
 461 /*-
 462  * The specs in hostserv can take these forms:
 463  *
 464  * host:service         => *host = "host", *service = "service"
 465  * host:*               => *host = "host", *service = NULL
 466  * host:                => *host = "host", *service = NULL
 467  * :service             => *host = NULL, *service = "service"
 468  * *:service            => *host = NULL, *service = "service"
 469  *
 470  * in case no : is present in the string, the result depends on
 471  * hostserv_prio, as follows:
 472  *
 473  * when hostserv_prio == BIO_PARSE_PRIO_HOST
 474  * host                 => *host = "host", *service untouched
 475  *
 476  * when hostserv_prio == BIO_PARSE_PRIO_SERV
 477  * service              => *host untouched, *service = "service"
 478  *
 479  */
 480 int BIO_parse_hostserv(const char *hostserv, char **host, char **service,
 481                        enum BIO_hostserv_priorities hostserv_prio)
 482 {
 483     const char *h = NULL; size_t hl = 0;
 484     const char *p = NULL; size_t pl = 0;
 485
 486     if (*hostserv == '[') {
 487         if ((p = strchr(hostserv, ']')) == NULL)
 488             goto spec_err;
 489         h = hostserv + 1;
 490         hl = p - h;
 491         p++;
 492         if (*p == '\0')
 493             p = NULL;
 494         else if (*p != ':')
 495             goto spec_err;
 496         else {
 497             p++;
 498             pl = strlen(p);
 499         }
 500     } else {
 501         const char *p2 = strrchr(hostserv, ':');
 502         p = strchr(hostserv, ':');
 503
 504         /*-
 505          * Check for more than one colon.  There are three possible
 506          * interpretations:
 507          * 1. IPv6 address with port number, last colon being separator.
 508          * 2. IPv6 address only.
 509          * 3. IPv6 address only if hostserv_prio == BIO_PARSE_PRIO_HOST,
 510          *    IPv6 address and port number if hostserv_prio == BIO_PARSE_PRIO_SERV
 511          * Because of this ambiguity, we currently choose to make it an
 512          * error.
 513          */
 514         if (p != p2)
 515             goto amb_err;
 516
 517         if (p != NULL) {
 518             h = hostserv;
 519             hl = p - h;
 520             p++;
 521             pl = strlen(p);
 522         } else if (hostserv_prio == BIO_PARSE_PRIO_HOST) {
 523             h = hostserv;
 524             hl = strlen(h);
 525         } else {
 526             p = hostserv;
 527             pl = strlen(p);
 528         }
 529     }
 530
 531     if (p != NULL && strchr(p, ':'))
 532         goto spec_err;
 533
 534     if (h != NULL && host != NULL) {
 535         if (hl == 0
 536             || (hl == 1 && h[0] == '*')) {
 537             *host = NULL;
 538         } else {
 539             *host = OPENSSL_strndup(h, hl);
 540             if (*host == NULL)
 541                 goto memerr;
 542         }
 543     }
 544     if (p != NULL && service != NULL) {
 545         if (pl == 0
 546             || (pl == 1 && p[0] == '*')) {
 547             *service = NULL;
 548         } else {
 549             *service = OPENSSL_strndup(p, pl);
 550             if (*service == NULL)
 551                 goto memerr;
 552         }
 553     }
 554
 555     return 1;
 556  amb_err:
 557     ERR_raise(ERR_LIB_BIO, BIO_R_AMBIGUOUS_HOST_OR_SERVICE);
 558     return 0;
 559  spec_err:
 560     ERR_raise(ERR_LIB_BIO, BIO_R_MALFORMED_HOST_OR_SERVICE);
 561     return 0;
 562  memerr:
 563     ERR_raise(ERR_LIB_BIO, ERR_R_MALLOC_FAILURE);
 564     return 0;
 565 }
 566
 567 /* addrinfo_wrap is used to build our own addrinfo "chain".
 568  * (it has only one entry, so calling it a chain may be a stretch)
 569  * It should ONLY be called when getaddrinfo() and friends
 570  * aren't available, OR when dealing with a non IP protocol
 571  * family, such as AF_UNIX
 572  *
 573  * the return value is 1 on success, or 0 on failure, which
 574  * only happens if a memory allocation error occurred.
 575  */
 576 static int addrinfo_wrap(int family, int socktype,
 577                          const void *where, size_t wherelen,
 578                          unsigned short port,
 579                          BIO_ADDRINFO **bai)
 580 {
 581     if ((*bai = OPENSSL_zalloc(sizeof(**bai))) == NULL) {
 582         ERR_raise(ERR_LIB_BIO, ERR_R_MALLOC_FAILURE);
 583         return 0;
 584     }
 585
 586     (*bai)->bai_family = family;
 587     (*bai)->bai_socktype = socktype;
 588     if (socktype == SOCK_STREAM)
 589         (*bai)->bai_protocol = IPPROTO_TCP;
 590     if (socktype == SOCK_DGRAM)
 591         (*bai)->bai_protocol = IPPROTO_UDP;
 592 #ifdef AF_UNIX
 593     if (family == AF_UNIX)
 594         (*bai)->bai_protocol = 0;
 595 #endif
 596     {
 597         /* Magic: We know that BIO_ADDR_sockaddr_noconst is really
 598            just an advanced cast of BIO_ADDR* to struct sockaddr *
 599            by the power of union, so while it may seem that we're
 600            creating a memory leak here, we are not.  It will be
 601            all right. */
 602         BIO_ADDR *addr = BIO_ADDR_new();
 603         if (addr != NULL) {
 604             BIO_ADDR_rawmake(addr, family, where, wherelen, port);
 605             (*bai)->bai_addr = BIO_ADDR_sockaddr_noconst(addr);
 606         }
 607     }
 608     (*bai)->bai_next = NULL;
 609     if ((*bai)->bai_addr == NULL) {
 610         BIO_ADDRINFO_free(*bai);
 611         *bai = NULL;
 612         return 0;
 613     }
 614     return 1;
 615 }
 616
 617 DEFINE_RUN_ONCE_STATIC(do_bio_lookup_init)
 618 {
 619     bio_lookup_lock = CRYPTO_THREAD_lock_new();
 620     return bio_lookup_lock != NULL;
 621 }
 622
 623 int BIO_lookup(const char *host, const char *service,
 624                enum BIO_lookup_type lookup_type,
 625                int family, int socktype, BIO_ADDRINFO **res)
 626 {
 627     return BIO_lookup_ex(host, service, lookup_type, family, socktype, 0, res);
 628 }
 629
 630 /*-
 631  * BIO_lookup_ex - look up the node and service you want to connect to.
 632  * @node: the node you want to connect to.
 633  * @service: the service you want to connect to.
 634  * @lookup_type: declare intent with the result, client or server.
 635  * @family: the address family you want to use.  Use AF_UNSPEC for any, or
 636  *  AF_INET, AF_INET6 or AF_UNIX.
 637  * @socktype: The socket type you want to use.  Can be SOCK_STREAM, SOCK_DGRAM
 638  *  or 0 for all.
 639  * @protocol: The protocol to use, e.g. IPPROTO_TCP or IPPROTO_UDP or 0 for all.
 640  *            Note that some platforms may not return IPPROTO_SCTP without
 641  *            explicitly requesting it (i.e. IPPROTO_SCTP may not be returned
 642  *            with 0 for the protocol)
 643  * @res: Storage place for the resulting list of returned addresses
 644  *
 645  * This will do a lookup of the node and service that you want to connect to.
 646  * It returns a linked list of different addresses you can try to connect to.
 647  *
 648  * When no longer needed you should call BIO_ADDRINFO_free() to free the result.
 649  *
 650  * The return value is 1 on success or 0 in case of error.
 651  */
 652 int BIO_lookup_ex(const char *host, const char *service, int lookup_type,
 653                   int family, int socktype, int protocol, BIO_ADDRINFO **res)
 654 {
 655     int ret = 0;                 /* Assume failure */
 656
 657     switch(family) {
 658     case AF_INET:
 659 #ifdef AF_INET6
 660     case AF_INET6:
 661 #endif
 662 #ifdef AF_UNIX
 663     case AF_UNIX:
 664 #endif
 665 #ifdef AF_UNSPEC
 666     case AF_UNSPEC:
 667 #endif
 668         break;
 669     default:
 670         ERR_raise(ERR_LIB_BIO, BIO_R_UNSUPPORTED_PROTOCOL_FAMILY);
 671         return 0;
 672     }
 673
 674 #ifdef AF_UNIX
 675     if (family == AF_UNIX) {
 676         if (addrinfo_wrap(family, socktype, host, strlen(host), 0, res))
 677             return 1;
 678         else
 679             ERR_raise(ERR_LIB_BIO, ERR_R_MALLOC_FAILURE);
 680         return 0;
 681     }
 682 #endif
 683
 684     if (BIO_sock_init() != 1)
 685         return 0;
 686
 687     if (1) {
 688 #ifdef AI_PASSIVE
 689         int gai_ret = 0, old_ret = 0;
 690         struct addrinfo hints;
 691
 692         memset(&hints, 0, sizeof(hints));
 693
 694         hints.ai_family = family;
 695         hints.ai_socktype = socktype;
 696         hints.ai_protocol = protocol;
 697 # ifdef AI_ADDRCONFIG
 698 #  ifdef AF_UNSPEC
 699         if (family == AF_UNSPEC)
 700 #  endif
 701             hints.ai_flags |= AI_ADDRCONFIG;
 702 # endif
 703
 704         if (lookup_type == BIO_LOOKUP_SERVER)
 705             hints.ai_flags |= AI_PASSIVE;
 706
 707         /* Note that |res| SHOULD be a 'struct addrinfo **' thanks to
 708          * macro magic in bio_local.h
 709          */
 710 # if defined(AI_ADDRCONFIG) && defined(AI_NUMERICHOST)
 711       retry:
 712 # endif
 713         switch ((gai_ret = getaddrinfo(host, service, &hints, res))) {
 714 # ifdef EAI_SYSTEM
 715         case EAI_SYSTEM:
 716             ERR_raise_data(ERR_LIB_SYS, get_last_socket_error(),
 717                            "calling getaddrinfo()");
 718             ERR_raise(ERR_LIB_BIO, ERR_R_SYS_LIB);
 719             break;
 720 # endif
 721 # ifdef EAI_MEMORY
 722         case EAI_MEMORY:
 723             ERR_raise(ERR_LIB_BIO, ERR_R_MALLOC_FAILURE);
 724             break;
 725 # endif
 726         case 0:
 727             ret = 1;             /* Success */
 728             break;
 729         default:
 730 # if defined(AI_ADDRCONFIG) && defined(AI_NUMERICHOST)
 731             if (hints.ai_flags & AI_ADDRCONFIG) {
 732                 hints.ai_flags &= ~AI_ADDRCONFIG;
 733                 hints.ai_flags |= AI_NUMERICHOST;
 734                 old_ret = gai_ret;
 735                 goto retry;
 736             }
 737 # endif
 738             ERR_raise_data(ERR_LIB_BIO, ERR_R_SYS_LIB,
 739                            gai_strerror(old_ret ? old_ret : gai_ret));
 740             break;
 741         }
 742     } else {
 743 #endif
 744         const struct hostent *he;
 745 /*
 746  * Because struct hostent is defined for 32-bit pointers only with
 747  * VMS C, we need to make sure that '&he_fallback_address' and
 748  * '&he_fallback_addresses' are 32-bit pointers
 749  */
 750 #if defined(OPENSSL_SYS_VMS) && defined(__DECC)
 751 # pragma pointer_size save
 752 # pragma pointer_size 32
 753 #endif
 754         /* Windows doesn't seem to have in_addr_t */
 755 #ifdef OPENSSL_SYS_WINDOWS
 756         static uint32_t he_fallback_address;
 757         static const char *he_fallback_addresses[] =
 758             { (char *)&he_fallback_address, NULL };
 759 #else
 760         static in_addr_t he_fallback_address;
 761         static const char *he_fallback_addresses[] =
 762             { (char *)&he_fallback_address, NULL };
 763 #endif
 764         static const struct hostent he_fallback =
 765             { NULL, NULL, AF_INET, sizeof(he_fallback_address),
 766               (char **)&he_fallback_addresses };
 767 #if defined(OPENSSL_SYS_VMS) && defined(__DECC)
 768 # pragma pointer_size restore
 769 #endif
 770
 771         struct servent *se;
 772         /* Apparently, on WIN64, s_proto and s_port have traded places... */
 773 #ifdef _WIN64
 774         struct servent se_fallback = { NULL, NULL, NULL, 0 };
 775 #else
 776         struct servent se_fallback = { NULL, NULL, 0, NULL };
 777 #endif
 778
 779         if (!RUN_ONCE(&bio_lookup_init, do_bio_lookup_init)) {
 780             ERR_raise(ERR_LIB_BIO, ERR_R_MALLOC_FAILURE);
 781             ret = 0;
 782             goto err;
 783         }
 784
 785         if (!CRYPTO_THREAD_write_lock(bio_lookup_lock)) {
 786             ret = 0;
 787             goto err;
 788         }
 789         he_fallback_address = INADDR_ANY;
 790         if (host == NULL) {
 791             he = &he_fallback;
 792             switch(lookup_type) {
 793             case BIO_LOOKUP_CLIENT:
 794                 he_fallback_address = INADDR_LOOPBACK;
 795                 break;
 796             case BIO_LOOKUP_SERVER:
 797                 he_fallback_address = INADDR_ANY;
 798                 break;
 799             default:
 800                 /* We forgot to handle a lookup type! */
 801                 assert("We forgot to handle a lookup type!" == NULL);
 802                 ERR_raise(ERR_LIB_BIO, ERR_R_INTERNAL_ERROR);
 803                 ret = 0;
 804                 goto err;
 805             }
 806         } else {
 807             he = gethostbyname(host);
 808
 809             if (he == NULL) {
 810 #ifndef OPENSSL_SYS_WINDOWS
 811                 /*
 812                  * This might be misleading, because h_errno is used as if
 813                  * it was errno. To minimize mixup add 1000. Underlying
 814                  * reason for this is that hstrerror is declared obsolete,
 815                  * not to mention that a) h_errno is not always guaranteed
 816                  * to be meaningless; b) hstrerror can reside in yet another
 817                  * library, linking for sake of hstrerror is an overkill;
 818                  * c) this path is not executed on contemporary systems
 819                  * anyway [above getaddrinfo/gai_strerror is]. We just let
 820                  * system administrator figure this out...
 821                  */
 822 # if defined(OPENSSL_SYS_VXWORKS)
 823                 /* h_errno doesn't exist on VxWorks */
 824                 ERR_raise_data(ERR_LIB_SYS, 1000,
 825                                "calling gethostbyname()");
 826 # else
 827                 ERR_raise_data(ERR_LIB_SYS, 1000 + h_errno,
 828                                "calling gethostbyname()");
 829 # endif
 830 #else
 831                 ERR_raise_data(ERR_LIB_SYS, get_last_socket_error(),
 832                                "calling gethostbyname()");
 833 #endif
 834                 ret = 0;
 835                 goto err;
 836             }
 837         }
 838
 839         if (service == NULL) {
 840             se_fallback.s_port = 0;
 841             se_fallback.s_proto = NULL;
 842             se = &se_fallback;
 843         } else {
 844             char *endp = NULL;
 845             long portnum = strtol(service, &endp, 10);
 846
 847 /*
 848  * Because struct servent is defined for 32-bit pointers only with
 849  * VMS C, we need to make sure that 'proto' is a 32-bit pointer.
 850  */
 851 #if defined(OPENSSL_SYS_VMS) && defined(__DECC)
 852 # pragma pointer_size save
 853 # pragma pointer_size 32
 854 #endif
 855             char *proto = NULL;
 856 #if defined(OPENSSL_SYS_VMS) && defined(__DECC)
 857 # pragma pointer_size restore
 858 #endif
 859
 860             switch (socktype) {
 861             case SOCK_STREAM:
 862                 proto = "tcp";
 863                 break;
 864             case SOCK_DGRAM:
 865                 proto = "udp";
 866                 break;
 867             }
 868
 869             if (endp != service && *endp == '\0'
 870                     && portnum > 0 && portnum < 65536) {
 871                 se_fallback.s_port = htons((unsigned short)portnum);
 872                 se_fallback.s_proto = proto;
 873                 se = &se_fallback;
 874             } else if (endp == service) {
 875                 se = getservbyname(service, proto);
 876
 877                 if (se == NULL) {
 878                     ERR_raise_data(ERR_LIB_SYS, get_last_socket_error(),
 879                                    "calling getservbyname()");
 880                     goto err;
 881                 }
 882             } else {
 883                 ERR_raise(ERR_LIB_BIO, BIO_R_MALFORMED_HOST_OR_SERVICE);
 884                 goto err;
 885             }
 886         }
 887
 888         *res = NULL;
 889
 890         {
 891 /*
 892  * Because hostent::h_addr_list is an array of 32-bit pointers with VMS C,
 893  * we must make sure our iterator designates the same element type, hence
 894  * the pointer size dance.
 895  */
 896 #if defined(OPENSSL_SYS_VMS) && defined(__DECC)
 897 # pragma pointer_size save
 898 # pragma pointer_size 32
 899 #endif
 900             char **addrlistp;
 901 #if defined(OPENSSL_SYS_VMS) && defined(__DECC)
 902 # pragma pointer_size restore
 903 #endif
 904             size_t addresses;
 905             BIO_ADDRINFO *tmp_bai = NULL;
 906
 907             /* The easiest way to create a linked list from an
 908                array is to start from the back */
 909             for(addrlistp = he->h_addr_list; *addrlistp != NULL;
 910                 addrlistp++)
 911                 ;
 912
 913             for(addresses = addrlistp - he->h_addr_list;
 914                 addrlistp--, addresses-- > 0; ) {
 915                 if (!addrinfo_wrap(he->h_addrtype, socktype,
 916                                    *addrlistp, he->h_length,
 917                                    se->s_port, &tmp_bai))
 918                     goto addrinfo_malloc_err;
 919                 tmp_bai->bai_next = *res;
 920                 *res = tmp_bai;
 921                 continue;
 922              addrinfo_malloc_err:
 923                 BIO_ADDRINFO_free(*res);
 924                 *res = NULL;
 925                 ERR_raise(ERR_LIB_BIO, ERR_R_MALLOC_FAILURE);
 926                 ret = 0;
 927                 goto err;
 928             }
 929
 930             ret = 1;
 931         }
 932      err:
 933         CRYPTO_THREAD_unlock(bio_lookup_lock);
 934     }
 935
 936     return ret;
 937 }
 938
 939 #endif /* OPENSSL_NO_SOCK */