crypto/bio/b_addr.c

   1 /* ====================================================================
   2  * Copyright (c) 2015 The OpenSSL Project.  All rights reserved.
   3  *
   4  * Redistribution and use in source and binary forms, with or without
   5  * modification, are permitted provided that the following conditions
   6  * are met:
   7  *
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  *
  11  * 2. Redistributions in binary form must reproduce the above copyright
  12  *    notice, this list of conditions and the following disclaimer in
  13  *    the documentation and/or other materials provided with the
  14  *    distribution.
  15  *
  16  * 3. All advertising materials mentioning features or use of this
  17  *    software must display the following acknowledgment:
  18  *    "This product includes software developed by the OpenSSL Project
  19  *    for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
  20  *
  21  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
  22  *    endorse or promote products derived from this software without
  23  *    prior written permission. For written permission, please contact
  24  *    openssl-core@openssl.org.
  25  *
  26  * 5. Products derived from this software may not be called "OpenSSL"
  27  *    nor may "OpenSSL" appear in their names without prior written
  28  *    permission of the OpenSSL Project.
  29  *
  30  * 6. Redistributions of any form whatsoever must retain the following
  31  *    acknowledgment:
  32  *    "This product includes software developed by the OpenSSL Project
  33  *    for use in the OpenSSL Toolkit (http://www.openssl.org/)"
  34  *
  35  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
  36  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  37  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  38  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
  39  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  40  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  41  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  42  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  43  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  44  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  45  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
  46  * OF THE POSSIBILITY OF SUCH DAMAGE.
  47  * ====================================================================
  48  *
  49  * This product includes cryptographic software written by Eric Young
  50  * (eay@cryptsoft.com).  This product includes software written by Tim
  51  * Hudson (tjh@cryptsoft.com).
  52  *
  53  */
  54
  55 #include <string.h>
  56
  57 #include "bio_lcl.h"
  58
  59 #include <openssl/err.h>
  60 #include <openssl/buffer.h>
  61
  62 /*
  63  * Throughout this file and bio_lcl.h, the existence of the macro
  64  * AI_PASSIVE is used to detect the availability of struct addrinfo,
  65  * getnameinfo() and getaddrinfo().  If that macro doesn't exist,
  66  * we use our own implementation instead, using gethostbyname,
  67  * getservbyname and a few other.
  68  */
  69
  70 /**********************************************************************
  71  *
  72  * Address structure
  73  *
  74  */
  75
  76 BIO_ADDR *BIO_ADDR_new(void)
  77 {
  78     BIO_ADDR *ret = OPENSSL_zalloc(sizeof(*ret));
  79
  80     ret->sa.sa_family = AF_UNSPEC;
  81     return ret;
  82 }
  83
  84 void BIO_ADDR_free(BIO_ADDR *ap)
  85 {
  86     OPENSSL_free(ap);
  87 }
  88
  89 void BIO_ADDR_clear(BIO_ADDR *ap)
  90 {
  91     memset(ap, 0, sizeof(*ap));
  92     ap->sa.sa_family = AF_UNSPEC;
  93 }
  94
  95 /*
  96  * BIO_ADDR_make - non-public routine to fill a BIO_ADDR with the contents
  97  * of a struct sockaddr.
  98  */
  99 int BIO_ADDR_make(BIO_ADDR *ap, const struct sockaddr *sa)
 100 {
 101     if (sa->sa_family == AF_INET) {
 102         ap->sin = *(const struct sockaddr_in *)sa;
 103         return 1;
 104     }
 105 #ifdef AF_INET6
 106     if (sa->sa_family == AF_INET6) {
 107         ap->sin6 = *(const struct sockaddr_in6 *)sa;
 108         return 1;
 109     }
 110 #endif
 111 #ifdef AF_UNIX
 112     if (ap->sa.sa_family == AF_UNIX) {
 113         ap->sun = *(const struct sockaddr_un *)sa;
 114         return 1;
 115     }
 116 #endif
 117
 118     return 0;
 119 }
 120
 121 int BIO_ADDR_rawmake(BIO_ADDR *ap, int family,
 122                      const void *where, size_t wherelen,
 123                      unsigned short port)
 124 {
 125 #ifdef AF_UNIX
 126     if (family == AF_UNIX) {
 127         if (wherelen + 1 > sizeof(ap->sun.sun_path))
 128             return 0;
 129         memset(&ap->sun, 0, sizeof(ap->sun));
 130         ap->sun.sun_family = family;
 131         strncpy(ap->sun.sun_path, where, sizeof(ap->sun.sun_path) - 1);
 132         return 1;
 133     }
 134 #endif
 135     if (family == AF_INET) {
 136         if (wherelen != sizeof(struct in_addr))
 137             return 0;
 138         memset(&ap->sin, 0, sizeof(ap->sin));
 139         ap->sin.sin_family = family;
 140         ap->sin.sin_port = port;
 141         ap->sin.sin_addr = *(struct in_addr *)where;
 142         return 1;
 143     }
 144 #ifdef AF_INET6
 145     if (family == AF_INET6) {
 146         if (wherelen != sizeof(struct in6_addr))
 147             return 0;
 148         memset(&ap->sin6, 0, sizeof(ap->sin6));
 149         ap->sin6.sin6_family = family;
 150         ap->sin6.sin6_port = port;
 151         ap->sin6.sin6_addr = *(struct in6_addr *)where;
 152         return 1;
 153     }
 154 #endif
 155
 156     return 0;
 157 }
 158
 159 int BIO_ADDR_family(const BIO_ADDR *ap)
 160 {
 161     return ap->sa.sa_family;
 162 }
 163
 164 int BIO_ADDR_rawaddress(const BIO_ADDR *ap, void *p, size_t *l)
 165 {
 166     size_t len = 0;
 167     const void *addrptr = NULL;
 168
 169     if (ap->sa.sa_family == AF_INET) {
 170         len = sizeof(ap->sin.sin_addr);
 171         addrptr = &ap->sin.sin_addr;
 172     }
 173 #ifdef AF_INET6
 174     else if (ap->sa.sa_family == AF_INET6) {
 175         len = sizeof(ap->sin6.sin6_addr);
 176         addrptr = &ap->sin6.sin6_addr;
 177     }
 178 #endif
 179 #ifdef AF_UNIX
 180     else if (ap->sa.sa_family == AF_UNIX) {
 181         len = strlen(ap->sun.sun_path);
 182         addrptr = &ap->sun.sun_path;
 183     }
 184 #endif
 185
 186     if (addrptr == NULL)
 187         return 0;
 188
 189     if (p != NULL) {
 190         memcpy(p, addrptr, len);
 191     }
 192     if (l != NULL)
 193         *l = len;
 194
 195     return 1;
 196 }
 197
 198 unsigned short BIO_ADDR_rawport(const BIO_ADDR *ap)
 199 {
 200     if (ap->sa.sa_family == AF_INET)
 201         return ap->sin.sin_port;
 202 #ifdef AF_INET6
 203     if (ap->sa.sa_family == AF_INET6)
 204         return ap->sin6.sin6_port;
 205 #endif
 206     return 0;
 207 }
 208
 209 /*-
 210  * addr_strings - helper function to get host and service names
 211  * @ap: the BIO_ADDR that has the input info
 212  * @numeric: 0 if actual names should be returned, 1 if the numeric
 213  * representation should be returned.
 214  * @hostname: a pointer to a pointer to a memory area to store the
 215  * host name or numeric representation.  Unused if NULL.
 216  * @service: a pointer to a pointer to a memory area to store the
 217  * service name or numeric representation.  Unused if NULL.
 218  *
 219  * The return value is 0 on failure, with the error code in the error
 220  * stack, and 1 on success.
 221  */
 222 static int addr_strings(const BIO_ADDR *ap, int numeric,
 223                         char **hostname, char **service)
 224 {
 225     if (BIO_sock_init() != 1)
 226         return 0;
 227
 228     if (1) {
 229 #ifdef AI_PASSIVE
 230         int ret = 0;
 231         char host[NI_MAXHOST], serv[NI_MAXSERV];
 232         int flags = 0;
 233
 234         if (numeric)
 235             flags |= NI_NUMERICHOST | NI_NUMERICSERV;
 236
 237         if ((ret = getnameinfo(BIO_ADDR_sockaddr(ap),
 238                                BIO_ADDR_sockaddr_size(ap),
 239                                host, sizeof(host), serv, sizeof(serv),
 240                                flags)) != 0) {
 241 # ifdef EAI_SYSTEM
 242             if (ret == EAI_SYSTEM) {
 243                 SYSerr(SYS_F_GETNAMEINFO, get_last_socket_error());
 244                 BIOerr(BIO_F_ADDR_STRINGS, ERR_R_SYS_LIB);
 245             } else
 246 # endif
 247             {
 248                 BIOerr(BIO_F_ADDR_STRINGS, ERR_R_SYS_LIB);
 249                 ERR_add_error_data(1, gai_strerror(ret));
 250             }
 251             return 0;
 252         }
 253         if (hostname)
 254             *hostname = OPENSSL_strdup(host);
 255         if (service)
 256             *service = OPENSSL_strdup(serv);
 257     } else {
 258 #endif
 259         if (hostname)
 260             *hostname = OPENSSL_strdup(inet_ntoa(ap->sin.sin_addr));
 261         if (service) {
 262             char serv[6];        /* port is 16 bits => max 5 decimal digits */
 263             BIO_snprintf(serv, sizeof(serv), "%d", ntohs(ap->sin.sin_port));
 264             *service = OPENSSL_strdup(serv);
 265         }
 266     }
 267
 268     return 1;
 269 }
 270
 271 char *BIO_ADDR_hostname_string(const BIO_ADDR *ap, int numeric)
 272 {
 273     char *hostname = NULL;
 274
 275     if (addr_strings(ap, numeric, &hostname, NULL))
 276         return hostname;
 277
 278     return NULL;
 279 }
 280
 281 char *BIO_ADDR_service_string(const BIO_ADDR *ap, int numeric)
 282 {
 283     char *service = NULL;
 284
 285     if (addr_strings(ap, numeric, NULL, &service))
 286         return service;
 287
 288     return NULL;
 289 }
 290
 291 char *BIO_ADDR_path_string(const BIO_ADDR *ap)
 292 {
 293 #ifdef AF_UNIX
 294     if (ap->sa.sa_family == AF_UNIX)
 295         return OPENSSL_strdup(ap->sun.sun_path);
 296 #endif
 297     return NULL;
 298 }
 299
 300 /*
 301  * BIO_ADDR_sockaddr - non-public routine to return the struct sockaddr
 302  * for a given BIO_ADDR.  In reality, this is simply a type safe cast.
 303  * The returned struct sockaddr is const, so it can't be tampered with.
 304  */
 305 const struct sockaddr *BIO_ADDR_sockaddr(const BIO_ADDR *ap)
 306 {
 307     return &(ap->sa);
 308 }
 309
 310 /*
 311  * BIO_ADDR_sockaddr_noconst - non-public function that does the same
 312  * as BIO_ADDR_sockaddr, but returns a non-const.  USE WITH CARE, as
 313  * it allows you to tamper with the data (and thereby the contents
 314  * of the input BIO_ADDR).
 315  */
 316 struct sockaddr *BIO_ADDR_sockaddr_noconst(BIO_ADDR *ap)
 317 {
 318     return &(ap->sa);
 319 }
 320
 321 /*
 322  * BIO_ADDR_sockaddr_size - non-public function that returns the size
 323  * of the struct sockaddr the BIO_ADDR is using.  If the protocol family
 324  * isn't set or is something other than AF_INET, AF_INET6 or AF_UNIX,
 325  * the size of the BIO_ADDR type is returned.
 326  */
 327 socklen_t BIO_ADDR_sockaddr_size(const BIO_ADDR *ap)
 328 {
 329     if (ap->sa.sa_family == AF_INET)
 330         return sizeof(ap->sin);
 331 #ifdef AF_INET6
 332     if (ap->sa.sa_family == AF_INET6)
 333         return sizeof(ap->sin6);
 334 #endif
 335 #ifdef AF_UNIX
 336     if (ap->sa.sa_family == AF_UNIX)
 337         return sizeof(ap->sun);
 338 #endif
 339     return sizeof(*ap);
 340 }
 341
 342 /**********************************************************************
 343  *
 344  * Address info database
 345  *
 346  */
 347
 348 const BIO_ADDRINFO *BIO_ADDRINFO_next(const BIO_ADDRINFO *bai)
 349 {
 350     if (bai != NULL)
 351         return bai->bai_next;
 352     return NULL;
 353 }
 354
 355 int BIO_ADDRINFO_family(const BIO_ADDRINFO *bai)
 356 {
 357     if (bai != NULL)
 358         return bai->bai_family;
 359     return 0;
 360 }
 361
 362 int BIO_ADDRINFO_socktype(const BIO_ADDRINFO *bai)
 363 {
 364     if (bai != NULL)
 365         return bai->bai_socktype;
 366     return 0;
 367 }
 368
 369 int BIO_ADDRINFO_protocol(const BIO_ADDRINFO *bai)
 370 {
 371     if (bai != NULL)
 372         return bai->bai_protocol;
 373     return 0;
 374 }
 375
 376 /*
 377  * BIO_ADDRINFO_sockaddr_size - non-public function that returns the size
 378  * of the struct sockaddr inside the BIO_ADDRINFO.
 379  */
 380 socklen_t BIO_ADDRINFO_sockaddr_size(const BIO_ADDRINFO *bai)
 381 {
 382     if (bai != NULL)
 383         return bai->bai_addrlen;
 384     return 0;
 385 }
 386
 387 /*
 388  * BIO_ADDRINFO_sockaddr - non-public function that returns bai_addr
 389  * as the struct sockaddr it is.
 390  */
 391 const struct sockaddr *BIO_ADDRINFO_sockaddr(const BIO_ADDRINFO *bai)
 392 {
 393     if (bai != NULL)
 394         return bai->bai_addr;
 395     return NULL;
 396 }
 397
 398 const BIO_ADDR *BIO_ADDRINFO_address(const BIO_ADDRINFO *bai)
 399 {
 400     if (bai != NULL)
 401         return (BIO_ADDR *)bai->bai_addr;
 402     return NULL;
 403 }
 404
 405 void BIO_ADDRINFO_free(BIO_ADDRINFO *bai)
 406 {
 407     if (bai == NULL)
 408         return;
 409
 410 #ifdef AI_PASSIVE
 411 # ifdef AF_UNIX
 412 #  define _cond bai->bai_family != AF_UNIX
 413 # else
 414 #  define _cond 1
 415 # endif
 416     if (_cond) {
 417         freeaddrinfo(bai);
 418         return;
 419     }
 420 #endif
 421
 422     /* Free manually when we know that addrinfo_wrap() was used.
 423      * See further comment above addrinfo_wrap()
 424      */
 425     while (bai != NULL) {
 426         BIO_ADDRINFO *next = bai->bai_next;
 427         OPENSSL_free(bai->bai_addr);
 428         OPENSSL_free(bai);
 429         bai = next;
 430     }
 431 }
 432
 433 /**********************************************************************
 434  *
 435  * Service functions
 436  *
 437  */
 438
 439 /*-
 440  * The specs in hostserv can take these forms:
 441  *
 442  * host:service         => *host = "host", *service = "service"
 443  * host:*               => *host = "host", *service = NULL
 444  * host:                => *host = "host", *service = NULL
 445  * :service             => *host = NULL, *service = "service"
 446  * *:service            => *host = NULL, *service = "service"
 447  *
 448  * in case no : is present in the string, the result depends on
 449  * hostserv_prio, as follows:
 450  *
 451  * when hostserv_prio == BIO_PARSE_PRIO_HOST
 452  * host                 => *host = "host", *service untouched
 453  *
 454  * when hostserv_prio == BIO_PARSE_PRIO_SERV
 455  * service              => *host untouched, *service = "service"
 456  *
 457  */
 458 int BIO_parse_hostserv(const char *hostserv, char **host, char **service,
 459                        enum BIO_hostserv_priorities hostserv_prio)
 460 {
 461     const char *h = NULL; size_t hl = 0;
 462     const char *p = NULL; size_t pl = 0;
 463
 464     if (*hostserv == '[') {
 465         if ((p = strchr(hostserv, ']')) == NULL)
 466             goto spec_err;
 467         h = hostserv + 1;
 468         hl = p - h;
 469         p++;
 470         if (*p == '\0')
 471             p = NULL;
 472         else if (*p != ':')
 473             goto spec_err;
 474         else {
 475             p++;
 476             pl = strlen(p);
 477         }
 478     } else {
 479         const char *p2 = strrchr(hostserv, ':');
 480         p = strchr(hostserv, ':');
 481
 482         /*-
 483          * Check for more than one colon.  There are three possible
 484          * interpretations:
 485          * 1. IPv6 address with port number, last colon being separator.
 486          * 2. IPv6 address only.
 487          * 3. IPv6 address only if hostserv_prio == BIO_PARSE_PRIO_HOST,
 488          *    IPv6 address and port number if hostserv_prio == BIO_PARSE_PRIO_SERV
 489          * Because of this ambiguity, we currently choose to make it an
 490          * error.
 491          */
 492         if (p != p2)
 493             goto amb_err;
 494
 495         if (p != NULL) {
 496             h = hostserv;
 497             hl = p - h;
 498             p++;
 499             pl = strlen(p);
 500         } else if (hostserv_prio == BIO_PARSE_PRIO_HOST) {
 501             h = hostserv;
 502             hl = strlen(h);
 503         } else {
 504             p = hostserv;
 505             pl = strlen(p);
 506         }
 507     }
 508
 509     if (p != NULL && strchr(p, ':'))
 510         goto spec_err;
 511
 512     if (h != NULL && host != NULL) {
 513         if (hl == 0
 514             || (hl == 1 && h[0] == '*')) {
 515             *host = NULL;
 516         } else {
 517             *host = OPENSSL_strndup(h, hl);
 518             if (*host == NULL)
 519                 goto memerr;
 520         }
 521     }
 522     if (p != NULL && service != NULL) {
 523         if (pl == 0
 524             || (pl == 1 && p[0] == '*')) {
 525             *service = NULL;
 526         } else {
 527             *service = OPENSSL_strndup(p, pl);
 528             if (*service == NULL)
 529                 goto memerr;
 530         }
 531     }
 532
 533     return 1;
 534  amb_err:
 535     BIOerr(BIO_F_BIO_PARSE_HOSTSERV, BIO_R_AMBIGUOUS_HOST_OR_SERVICE);
 536     return 0;
 537  spec_err:
 538     BIOerr(BIO_F_BIO_PARSE_HOSTSERV, BIO_R_MALFORMED_HOST_OR_SERVICE);
 539     return 0;
 540  memerr:
 541     BIOerr(BIO_F_BIO_PARSE_HOSTSERV, ERR_R_MALLOC_FAILURE);
 542     return 0;
 543 }
 544
 545 /* addrinfo_wrap is used to build our own addrinfo "chain".
 546  * (it has only one entry, so calling it a chain may be a stretch)
 547  * It should ONLY be called when getaddrinfo() and friends
 548  * aren't available, OR when dealing with a non IP protocol
 549  * family, such as AF_UNIX
 550  *
 551  * the return value is 1 on success, or 0 on failure, which
 552  * only happens if a memory allocation error occured.
 553  */
 554 static int addrinfo_wrap(int family, int socktype,
 555                          const void *where, size_t wherelen,
 556                          unsigned short port,
 557                          BIO_ADDRINFO **bai)
 558 {
 559     OPENSSL_assert(bai != NULL);
 560
 561     *bai = OPENSSL_zalloc(sizeof(**bai));
 562     if (*bai == NULL)
 563         return 0;
 564
 565     (*bai)->bai_family = family;
 566     (*bai)->bai_socktype = socktype;
 567     if (socktype == SOCK_STREAM)
 568         (*bai)->bai_protocol = IPPROTO_TCP;
 569     if (socktype == SOCK_DGRAM)
 570         (*bai)->bai_protocol = IPPROTO_UDP;
 571 #ifdef AF_UNIX
 572     if (family == AF_UNIX)
 573         (*bai)->bai_protocol = 0;
 574 #endif
 575     {
 576         /* Magic: We know that BIO_ADDR_sockaddr_noconst is really
 577            just an advanced cast of BIO_ADDR* to struct sockaddr *
 578            by the power of union, so while it may seem that we're
 579            creating a memory leak here, we are not.  It will be
 580            all right. */
 581         BIO_ADDR *addr = BIO_ADDR_new();
 582         if (addr != NULL) {
 583             BIO_ADDR_rawmake(addr, family, where, wherelen, port);
 584             (*bai)->bai_addr = BIO_ADDR_sockaddr_noconst(addr);
 585         }
 586     }
 587     (*bai)->bai_next = NULL;
 588     if ((*bai)->bai_addr == NULL) {
 589         BIO_ADDRINFO_free(*bai);
 590         *bai = NULL;
 591         return 0;
 592     }
 593     return 1;
 594 }
 595
 596 /*-
 597  * BIO_lookup - look up the node and service you want to connect to.
 598  * @node: the node you want to connect to.
 599  * @service: the service you want to connect to.
 600  * @lookup_type: declare intent with the result, client or server.
 601  * @family: the address family you want to use.  Use AF_UNSPEC for any, or
 602  *  AF_INET, AF_INET6 or AF_UNIX.
 603  * @socktype: The socket type you want to use.  Can be SOCK_STREAM, SOCK_DGRAM
 604  *  or 0 for all.
 605  * @res: Storage place for the resulting list of returned addresses
 606  *
 607  * This will do a lookup of the node and service that you want to connect to.
 608  * It returns a linked list of different addresses you can try to connect to.
 609  *
 610  * When no longer needed you should call BIO_ADDRINFO_free() to free the result.
 611  *
 612  * The return value is 1 on success or 0 in case of error.
 613  */
 614 int BIO_lookup(const char *host, const char *service,
 615                enum BIO_lookup_type lookup_type,
 616                int family, int socktype, BIO_ADDRINFO **res)
 617 {
 618     int ret = 0;                 /* Assume failure */
 619
 620     switch(family) {
 621     case AF_INET:
 622 #ifdef AF_INET6
 623     case AF_INET6:
 624 #endif
 625 #ifdef AF_UNIX
 626     case AF_UNIX:
 627 #endif
 628 #ifdef AF_UNSPEC
 629     case AF_UNSPEC:
 630 #endif
 631         break;
 632     default:
 633         BIOerr(BIO_F_BIO_LOOKUP, BIO_R_UNSUPPORTED_PROTOCOL_FAMILY);
 634         return 0;
 635     }
 636
 637 #ifdef AF_UNIX
 638     if (family == AF_UNIX) {
 639         if (addrinfo_wrap(family, socktype, host, strlen(host), 0, res))
 640             return 1;
 641         else
 642             BIOerr(BIO_F_BIO_LOOKUP, ERR_R_MALLOC_FAILURE);
 643         return 0;
 644     }
 645 #endif
 646
 647     if (BIO_sock_init() != 1)
 648         return 0;
 649
 650     if (1) {
 651         int gai_ret = 0;
 652 #ifdef AI_PASSIVE
 653         struct addrinfo hints;
 654
 655         hints.ai_flags = 0;
 656 # ifdef AI_ADDRCONFIG
 657         hints.ai_flags = AI_ADDRCONFIG;
 658 # endif
 659         hints.ai_family = family;
 660         hints.ai_socktype = socktype;
 661         hints.ai_protocol = 0;
 662         hints.ai_addrlen = 0;
 663         hints.ai_addr = NULL;
 664         hints.ai_canonname = NULL;
 665         hints.ai_next = NULL;
 666
 667         if (lookup_type == BIO_LOOKUP_SERVER)
 668             hints.ai_flags |= AI_PASSIVE;
 669
 670         /* Note that |res| SHOULD be a 'struct addrinfo **' thanks to
 671          * macro magic in bio_lcl.h
 672          */
 673         switch ((gai_ret = getaddrinfo(host, service, &hints, res))) {
 674 # ifdef EAI_SYSTEM
 675         case EAI_SYSTEM:
 676             SYSerr(SYS_F_GETADDRINFO, get_last_socket_error());
 677             BIOerr(BIO_F_BIO_LOOKUP, ERR_R_SYS_LIB);
 678             break;
 679 # endif
 680         case 0:
 681             ret = 1;             /* Success */
 682             break;
 683         default:
 684             BIOerr(BIO_F_BIO_LOOKUP, ERR_R_SYS_LIB);
 685             ERR_add_error_data(1, gai_strerror(gai_ret));
 686             break;
 687         }
 688     } else {
 689 #endif
 690         const struct hostent *he;
 691         /* Windows doesn't seem to have in_addr_t */
 692 #ifdef OPENSSL_SYS_WINDOWS
 693         static uint32_t he_fallback_address;
 694         static const uint32_t *he_fallback_addresses[] =
 695             { &he_fallback_address, NULL };
 696 #else
 697         static in_addr_t he_fallback_address;
 698         static const in_addr_t *he_fallback_addresses[] =
 699             { &he_fallback_address, NULL };
 700 #endif
 701         static const struct hostent he_fallback =
 702             { NULL, NULL, AF_INET, sizeof(he_fallback_address),
 703               (char **)&he_fallback_addresses };
 704         struct servent *se;
 705         /* Apprently, on WIN64, s_proto and s_port have traded places... */
 706 #ifdef _WIN64
 707         struct servent se_fallback = { NULL, NULL, NULL, 0 };
 708 #else
 709         struct servent se_fallback = { NULL, NULL, 0, NULL };
 710 #endif
 711         char *proto = NULL;
 712
 713         CRYPTO_w_lock(CRYPTO_LOCK_GETHOSTBYNAME);
 714         CRYPTO_w_lock(CRYPTO_LOCK_GETSERVBYNAME);
 715         he_fallback_address = INADDR_ANY;
 716         if (host == NULL) {
 717             he = &he_fallback;
 718             switch(lookup_type) {
 719             case BIO_LOOKUP_CLIENT:
 720                 he_fallback_address = INADDR_LOOPBACK;
 721                 break;
 722             case BIO_LOOKUP_SERVER:
 723                 he_fallback_address = INADDR_ANY;
 724                 break;
 725             default:
 726                 OPENSSL_assert(("We forgot to handle a lookup type!" == 0));
 727                 break;
 728             }
 729         } else {
 730             he = gethostbyname(host);
 731
 732             if (he == NULL) {
 733 #ifndef OPENSSL_SYS_WINDOWS
 734                 BIOerr(BIO_F_BIO_LOOKUP, ERR_R_SYS_LIB);
 735                 ERR_add_error_data(1, hstrerror(h_errno));
 736 #else
 737                 SYSerr(SYS_F_GETHOSTBYNAME, WSAGetLastError());
 738 #endif
 739                 ret = 0;
 740                 goto err;
 741             }
 742         }
 743
 744         if (service == NULL) {
 745             se_fallback.s_port = 0;
 746             se_fallback.s_proto = proto;
 747             se = &se_fallback;
 748         } else {
 749             char *endp = NULL;
 750             long portnum = strtol(service, &endp, 10);
 751
 752             if (endp != service && *endp == '\0'
 753                     && portnum > 0 && portnum < 65536) {
 754                 se_fallback.s_port = htons(portnum);
 755                 se_fallback.s_proto = proto;
 756                 se = &se_fallback;
 757             } else if (endp == service) {
 758                 switch (socktype) {
 759                 case SOCK_STREAM:
 760                     proto = "tcp";
 761                     break;
 762                 case SOCK_DGRAM:
 763                     proto = "udp";
 764                     break;
 765                 }
 766                 se = getservbyname(service, proto);
 767
 768                 if (se == NULL) {
 769 #ifndef OPENSSL_SYS_WINDOWS
 770                     BIOerr(BIO_F_BIO_LOOKUP, ERR_R_SYS_LIB);
 771                     ERR_add_error_data(1, hstrerror(h_errno));
 772 #else
 773                     SYSerr(SYS_F_GETSERVBYNAME, WSAGetLastError());
 774 #endif
 775                     goto err;
 776                 }
 777             } else {
 778                 BIOerr(BIO_F_BIO_LOOKUP, BIO_R_MALFORMED_HOST_OR_SERVICE);
 779                 goto err;
 780             }
 781         }
 782
 783         *res = NULL;
 784
 785         {
 786             char **addrlistp;
 787             size_t addresses;
 788             BIO_ADDRINFO *tmp_bai = NULL;
 789
 790             /* The easiest way to create a linked list from an
 791                array is to start from the back */
 792             for(addrlistp = he->h_addr_list; *addrlistp != NULL;
 793                 addrlistp++)
 794                 ;
 795
 796             for(addresses = addrlistp - he->h_addr_list;
 797                 addrlistp--, addresses-- > 0; ) {
 798                 if (!addrinfo_wrap(he->h_addrtype, socktype,
 799                                    *addrlistp, he->h_length,
 800                                    se->s_port, &tmp_bai))
 801                     goto addrinfo_malloc_err;
 802                 tmp_bai->bai_next = *res;
 803                 *res = tmp_bai;
 804                 continue;
 805              addrinfo_malloc_err:
 806                 BIO_ADDRINFO_free(*res);
 807                 *res = NULL;
 808                 BIOerr(BIO_F_BIO_LOOKUP, ERR_R_MALLOC_FAILURE);
 809                 ret = 0;
 810                 goto err;
 811             }
 812
 813             ret = 1;
 814         }
 815      err:
 816         CRYPTO_w_unlock(CRYPTO_LOCK_GETSERVBYNAME);
 817         CRYPTO_w_unlock(CRYPTO_LOCK_GETHOSTBYNAME);
 818     }
 819
 820     return ret;
 821 }