crypto/bio/b_addr.c

   1 /*
   2  * Copyright 2016-2017 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 #include <assert.h>
  11 #include <string.h>
  12
  13 #include "bio_lcl.h"
  14 #include <openssl/crypto.h>
  15
  16 #ifndef OPENSSL_NO_SOCK
  17 #include <openssl/err.h>
  18 #include <openssl/buffer.h>
  19 #include "internal/thread_once.h"
  20
  21 CRYPTO_RWLOCK *bio_lookup_lock;
  22 static CRYPTO_ONCE bio_lookup_init = CRYPTO_ONCE_STATIC_INIT;
  23
  24 /*
  25  * Throughout this file and bio_lcl.h, the existence of the macro
  26  * AI_PASSIVE is used to detect the availability of struct addrinfo,
  27  * getnameinfo() and getaddrinfo().  If that macro doesn't exist,
  28  * we use our own implementation instead, using gethostbyname,
  29  * getservbyname and a few other.
  30  */
  31
  32 /**********************************************************************
  33  *
  34  * Address structure
  35  *
  36  */
  37
  38 BIO_ADDR *BIO_ADDR_new(void)
  39 {
  40     BIO_ADDR *ret = OPENSSL_zalloc(sizeof(*ret));
  41
  42     if (ret == NULL) {
  43         BIOerr(BIO_F_BIO_ADDR_NEW, ERR_R_MALLOC_FAILURE);
  44         return NULL;
  45     }
  46
  47     ret->sa.sa_family = AF_UNSPEC;
  48     return ret;
  49 }
  50
  51 void BIO_ADDR_free(BIO_ADDR *ap)
  52 {
  53     OPENSSL_free(ap);
  54 }
  55
  56 void BIO_ADDR_clear(BIO_ADDR *ap)
  57 {
  58     memset(ap, 0, sizeof(*ap));
  59     ap->sa.sa_family = AF_UNSPEC;
  60 }
  61
  62 /*
  63  * BIO_ADDR_make - non-public routine to fill a BIO_ADDR with the contents
  64  * of a struct sockaddr.
  65  */
  66 int BIO_ADDR_make(BIO_ADDR *ap, const struct sockaddr *sa)
  67 {
  68     if (sa->sa_family == AF_INET) {
  69         ap->s_in = *(const struct sockaddr_in *)sa;
  70         return 1;
  71     }
  72 #ifdef AF_INET6
  73     if (sa->sa_family == AF_INET6) {
  74         ap->s_in6 = *(const struct sockaddr_in6 *)sa;
  75         return 1;
  76     }
  77 #endif
  78 #ifdef AF_UNIX
  79     if (ap->sa.sa_family == AF_UNIX) {
  80         ap->s_un = *(const struct sockaddr_un *)sa;
  81         return 1;
  82     }
  83 #endif
  84
  85     return 0;
  86 }
  87
  88 int BIO_ADDR_rawmake(BIO_ADDR *ap, int family,
  89                      const void *where, size_t wherelen,
  90                      unsigned short port)
  91 {
  92 #ifdef AF_UNIX
  93     if (family == AF_UNIX) {
  94         if (wherelen + 1 > sizeof(ap->s_un.sun_path))
  95             return 0;
  96         memset(&ap->s_un, 0, sizeof(ap->s_un));
  97         ap->s_un.sun_family = family;
  98         strncpy(ap->s_un.sun_path, where, sizeof(ap->s_un.sun_path) - 1);
  99         return 1;
 100     }
 101 #endif
 102     if (family == AF_INET) {
 103         if (wherelen != sizeof(struct in_addr))
 104             return 0;
 105         memset(&ap->s_in, 0, sizeof(ap->s_in));
 106         ap->s_in.sin_family = family;
 107         ap->s_in.sin_port = port;
 108         ap->s_in.sin_addr = *(struct in_addr *)where;
 109         return 1;
 110     }
 111 #ifdef AF_INET6
 112     if (family == AF_INET6) {
 113         if (wherelen != sizeof(struct in6_addr))
 114             return 0;
 115         memset(&ap->s_in6, 0, sizeof(ap->s_in6));
 116         ap->s_in6.sin6_family = family;
 117         ap->s_in6.sin6_port = port;
 118         ap->s_in6.sin6_addr = *(struct in6_addr *)where;
 119         return 1;
 120     }
 121 #endif
 122
 123     return 0;
 124 }
 125
 126 int BIO_ADDR_family(const BIO_ADDR *ap)
 127 {
 128     return ap->sa.sa_family;
 129 }
 130
 131 int BIO_ADDR_rawaddress(const BIO_ADDR *ap, void *p, size_t *l)
 132 {
 133     size_t len = 0;
 134     const void *addrptr = NULL;
 135
 136     if (ap->sa.sa_family == AF_INET) {
 137         len = sizeof(ap->s_in.sin_addr);
 138         addrptr = &ap->s_in.sin_addr;
 139     }
 140 #ifdef AF_INET6
 141     else if (ap->sa.sa_family == AF_INET6) {
 142         len = sizeof(ap->s_in6.sin6_addr);
 143         addrptr = &ap->s_in6.sin6_addr;
 144     }
 145 #endif
 146 #ifdef AF_UNIX
 147     else if (ap->sa.sa_family == AF_UNIX) {
 148         len = strlen(ap->s_un.sun_path);
 149         addrptr = &ap->s_un.sun_path;
 150     }
 151 #endif
 152
 153     if (addrptr == NULL)
 154         return 0;
 155
 156     if (p != NULL) {
 157         memcpy(p, addrptr, len);
 158     }
 159     if (l != NULL)
 160         *l = len;
 161
 162     return 1;
 163 }
 164
 165 unsigned short BIO_ADDR_rawport(const BIO_ADDR *ap)
 166 {
 167     if (ap->sa.sa_family == AF_INET)
 168         return ap->s_in.sin_port;
 169 #ifdef AF_INET6
 170     if (ap->sa.sa_family == AF_INET6)
 171         return ap->s_in6.sin6_port;
 172 #endif
 173     return 0;
 174 }
 175
 176 /*-
 177  * addr_strings - helper function to get host and service names
 178  * @ap: the BIO_ADDR that has the input info
 179  * @numeric: 0 if actual names should be returned, 1 if the numeric
 180  * representation should be returned.
 181  * @hostname: a pointer to a pointer to a memory area to store the
 182  * host name or numeric representation.  Unused if NULL.
 183  * @service: a pointer to a pointer to a memory area to store the
 184  * service name or numeric representation.  Unused if NULL.
 185  *
 186  * The return value is 0 on failure, with the error code in the error
 187  * stack, and 1 on success.
 188  */
 189 static int addr_strings(const BIO_ADDR *ap, int numeric,
 190                         char **hostname, char **service)
 191 {
 192     if (BIO_sock_init() != 1)
 193         return 0;
 194
 195     if (1) {
 196 #ifdef AI_PASSIVE
 197         int ret = 0;
 198         char host[NI_MAXHOST] = "", serv[NI_MAXSERV] = "";
 199         int flags = 0;
 200
 201         if (numeric)
 202             flags |= NI_NUMERICHOST | NI_NUMERICSERV;
 203
 204         if ((ret = getnameinfo(BIO_ADDR_sockaddr(ap),
 205                                BIO_ADDR_sockaddr_size(ap),
 206                                host, sizeof(host), serv, sizeof(serv),
 207                                flags)) != 0) {
 208 # ifdef EAI_SYSTEM
 209             if (ret == EAI_SYSTEM) {
 210                 SYSerr(SYS_F_GETNAMEINFO, get_last_socket_error());
 211                 BIOerr(BIO_F_ADDR_STRINGS, ERR_R_SYS_LIB);
 212             } else
 213 # endif
 214             {
 215                 BIOerr(BIO_F_ADDR_STRINGS, ERR_R_SYS_LIB);
 216                 ERR_add_error_data(1, gai_strerror(ret));
 217             }
 218             return 0;
 219         }
 220
 221         /* VMS getnameinfo() has a bug, it doesn't fill in serv, which
 222          * leaves it with whatever garbage that happens to be there.
 223          * However, we initialise serv with the empty string (serv[0]
 224          * is therefore NUL), so it gets real easy to detect when things
 225          * didn't go the way one might expect.
 226          */
 227         if (serv[0] == '\0') {
 228             BIO_snprintf(serv, sizeof(serv), "%d",
 229                          ntohs(BIO_ADDR_rawport(ap)));
 230         }
 231
 232         if (hostname != NULL)
 233             *hostname = OPENSSL_strdup(host);
 234         if (service != NULL)
 235             *service = OPENSSL_strdup(serv);
 236     } else {
 237 #endif
 238         if (hostname != NULL)
 239             *hostname = OPENSSL_strdup(inet_ntoa(ap->s_in.sin_addr));
 240         if (service != NULL) {
 241             char serv[6];        /* port is 16 bits => max 5 decimal digits */
 242             BIO_snprintf(serv, sizeof(serv), "%d", ntohs(ap->s_in.sin_port));
 243             *service = OPENSSL_strdup(serv);
 244         }
 245     }
 246
 247     if ((hostname != NULL && *hostname == NULL)
 248             || (service != NULL && *service == NULL)) {
 249         if (hostname != NULL) {
 250             OPENSSL_free(*hostname);
 251             *hostname = NULL;
 252         }
 253         if (service != NULL) {
 254             OPENSSL_free(*service);
 255             *service = NULL;
 256         }
 257         BIOerr(BIO_F_ADDR_STRINGS, ERR_R_MALLOC_FAILURE);
 258         return 0;
 259     }
 260
 261     return 1;
 262 }
 263
 264 char *BIO_ADDR_hostname_string(const BIO_ADDR *ap, int numeric)
 265 {
 266     char *hostname = NULL;
 267
 268     if (addr_strings(ap, numeric, &hostname, NULL))
 269         return hostname;
 270
 271     return NULL;
 272 }
 273
 274 char *BIO_ADDR_service_string(const BIO_ADDR *ap, int numeric)
 275 {
 276     char *service = NULL;
 277
 278     if (addr_strings(ap, numeric, NULL, &service))
 279         return service;
 280
 281     return NULL;
 282 }
 283
 284 char *BIO_ADDR_path_string(const BIO_ADDR *ap)
 285 {
 286 #ifdef AF_UNIX
 287     if (ap->sa.sa_family == AF_UNIX)
 288         return OPENSSL_strdup(ap->s_un.sun_path);
 289 #endif
 290     return NULL;
 291 }
 292
 293 /*
 294  * BIO_ADDR_sockaddr - non-public routine to return the struct sockaddr
 295  * for a given BIO_ADDR.  In reality, this is simply a type safe cast.
 296  * The returned struct sockaddr is const, so it can't be tampered with.
 297  */
 298 const struct sockaddr *BIO_ADDR_sockaddr(const BIO_ADDR *ap)
 299 {
 300     return &(ap->sa);
 301 }
 302
 303 /*
 304  * BIO_ADDR_sockaddr_noconst - non-public function that does the same
 305  * as BIO_ADDR_sockaddr, but returns a non-const.  USE WITH CARE, as
 306  * it allows you to tamper with the data (and thereby the contents
 307  * of the input BIO_ADDR).
 308  */
 309 struct sockaddr *BIO_ADDR_sockaddr_noconst(BIO_ADDR *ap)
 310 {
 311     return &(ap->sa);
 312 }
 313
 314 /*
 315  * BIO_ADDR_sockaddr_size - non-public function that returns the size
 316  * of the struct sockaddr the BIO_ADDR is using.  If the protocol family
 317  * isn't set or is something other than AF_INET, AF_INET6 or AF_UNIX,
 318  * the size of the BIO_ADDR type is returned.
 319  */
 320 socklen_t BIO_ADDR_sockaddr_size(const BIO_ADDR *ap)
 321 {
 322     if (ap->sa.sa_family == AF_INET)
 323         return sizeof(ap->s_in);
 324 #ifdef AF_INET6
 325     if (ap->sa.sa_family == AF_INET6)
 326         return sizeof(ap->s_in6);
 327 #endif
 328 #ifdef AF_UNIX
 329     if (ap->sa.sa_family == AF_UNIX)
 330         return sizeof(ap->s_un);
 331 #endif
 332     return sizeof(*ap);
 333 }
 334
 335 /**********************************************************************
 336  *
 337  * Address info database
 338  *
 339  */
 340
 341 const BIO_ADDRINFO *BIO_ADDRINFO_next(const BIO_ADDRINFO *bai)
 342 {
 343     if (bai != NULL)
 344         return bai->bai_next;
 345     return NULL;
 346 }
 347
 348 int BIO_ADDRINFO_family(const BIO_ADDRINFO *bai)
 349 {
 350     if (bai != NULL)
 351         return bai->bai_family;
 352     return 0;
 353 }
 354
 355 int BIO_ADDRINFO_socktype(const BIO_ADDRINFO *bai)
 356 {
 357     if (bai != NULL)
 358         return bai->bai_socktype;
 359     return 0;
 360 }
 361
 362 int BIO_ADDRINFO_protocol(const BIO_ADDRINFO *bai)
 363 {
 364     if (bai != NULL) {
 365         if (bai->bai_protocol != 0)
 366             return bai->bai_protocol;
 367
 368 #ifdef AF_UNIX
 369         if (bai->bai_family == AF_UNIX)
 370             return 0;
 371 #endif
 372
 373         switch (bai->bai_socktype) {
 374         case SOCK_STREAM:
 375             return IPPROTO_TCP;
 376         case SOCK_DGRAM:
 377             return IPPROTO_UDP;
 378         default:
 379             break;
 380         }
 381     }
 382     return 0;
 383 }
 384
 385 /*
 386  * BIO_ADDRINFO_sockaddr_size - non-public function that returns the size
 387  * of the struct sockaddr inside the BIO_ADDRINFO.
 388  */
 389 socklen_t BIO_ADDRINFO_sockaddr_size(const BIO_ADDRINFO *bai)
 390 {
 391     if (bai != NULL)
 392         return bai->bai_addrlen;
 393     return 0;
 394 }
 395
 396 /*
 397  * BIO_ADDRINFO_sockaddr - non-public function that returns bai_addr
 398  * as the struct sockaddr it is.
 399  */
 400 const struct sockaddr *BIO_ADDRINFO_sockaddr(const BIO_ADDRINFO *bai)
 401 {
 402     if (bai != NULL)
 403         return bai->bai_addr;
 404     return NULL;
 405 }
 406
 407 const BIO_ADDR *BIO_ADDRINFO_address(const BIO_ADDRINFO *bai)
 408 {
 409     if (bai != NULL)
 410         return (BIO_ADDR *)bai->bai_addr;
 411     return NULL;
 412 }
 413
 414 void BIO_ADDRINFO_free(BIO_ADDRINFO *bai)
 415 {
 416     if (bai == NULL)
 417         return;
 418
 419 #ifdef AI_PASSIVE
 420 # ifdef AF_UNIX
 421 #  define _cond bai->bai_family != AF_UNIX
 422 # else
 423 #  define _cond 1
 424 # endif
 425     if (_cond) {
 426         freeaddrinfo(bai);
 427         return;
 428     }
 429 #endif
 430
 431     /* Free manually when we know that addrinfo_wrap() was used.
 432      * See further comment above addrinfo_wrap()
 433      */
 434     while (bai != NULL) {
 435         BIO_ADDRINFO *next = bai->bai_next;
 436         OPENSSL_free(bai->bai_addr);
 437         OPENSSL_free(bai);
 438         bai = next;
 439     }
 440 }
 441
 442 /**********************************************************************
 443  *
 444  * Service functions
 445  *
 446  */
 447
 448 /*-
 449  * The specs in hostserv can take these forms:
 450  *
 451  * host:service         => *host = "host", *service = "service"
 452  * host:*               => *host = "host", *service = NULL
 453  * host:                => *host = "host", *service = NULL
 454  * :service             => *host = NULL, *service = "service"
 455  * *:service            => *host = NULL, *service = "service"
 456  *
 457  * in case no : is present in the string, the result depends on
 458  * hostserv_prio, as follows:
 459  *
 460  * when hostserv_prio == BIO_PARSE_PRIO_HOST
 461  * host                 => *host = "host", *service untouched
 462  *
 463  * when hostserv_prio == BIO_PARSE_PRIO_SERV
 464  * service              => *host untouched, *service = "service"
 465  *
 466  */
 467 int BIO_parse_hostserv(const char *hostserv, char **host, char **service,
 468                        enum BIO_hostserv_priorities hostserv_prio)
 469 {
 470     const char *h = NULL; size_t hl = 0;
 471     const char *p = NULL; size_t pl = 0;
 472
 473     if (*hostserv == '[') {
 474         if ((p = strchr(hostserv, ']')) == NULL)
 475             goto spec_err;
 476         h = hostserv + 1;
 477         hl = p - h;
 478         p++;
 479         if (*p == '\0')
 480             p = NULL;
 481         else if (*p != ':')
 482             goto spec_err;
 483         else {
 484             p++;
 485             pl = strlen(p);
 486         }
 487     } else {
 488         const char *p2 = strrchr(hostserv, ':');
 489         p = strchr(hostserv, ':');
 490
 491         /*-
 492          * Check for more than one colon.  There are three possible
 493          * interpretations:
 494          * 1. IPv6 address with port number, last colon being separator.
 495          * 2. IPv6 address only.
 496          * 3. IPv6 address only if hostserv_prio == BIO_PARSE_PRIO_HOST,
 497          *    IPv6 address and port number if hostserv_prio == BIO_PARSE_PRIO_SERV
 498          * Because of this ambiguity, we currently choose to make it an
 499          * error.
 500          */
 501         if (p != p2)
 502             goto amb_err;
 503
 504         if (p != NULL) {
 505             h = hostserv;
 506             hl = p - h;
 507             p++;
 508             pl = strlen(p);
 509         } else if (hostserv_prio == BIO_PARSE_PRIO_HOST) {
 510             h = hostserv;
 511             hl = strlen(h);
 512         } else {
 513             p = hostserv;
 514             pl = strlen(p);
 515         }
 516     }
 517
 518     if (p != NULL && strchr(p, ':'))
 519         goto spec_err;
 520
 521     if (h != NULL && host != NULL) {
 522         if (hl == 0
 523             || (hl == 1 && h[0] == '*')) {
 524             *host = NULL;
 525         } else {
 526             *host = OPENSSL_strndup(h, hl);
 527             if (*host == NULL)
 528                 goto memerr;
 529         }
 530     }
 531     if (p != NULL && service != NULL) {
 532         if (pl == 0
 533             || (pl == 1 && p[0] == '*')) {
 534             *service = NULL;
 535         } else {
 536             *service = OPENSSL_strndup(p, pl);
 537             if (*service == NULL)
 538                 goto memerr;
 539         }
 540     }
 541
 542     return 1;
 543  amb_err:
 544     BIOerr(BIO_F_BIO_PARSE_HOSTSERV, BIO_R_AMBIGUOUS_HOST_OR_SERVICE);
 545     return 0;
 546  spec_err:
 547     BIOerr(BIO_F_BIO_PARSE_HOSTSERV, BIO_R_MALFORMED_HOST_OR_SERVICE);
 548     return 0;
 549  memerr:
 550     BIOerr(BIO_F_BIO_PARSE_HOSTSERV, ERR_R_MALLOC_FAILURE);
 551     return 0;
 552 }
 553
 554 /* addrinfo_wrap is used to build our own addrinfo "chain".
 555  * (it has only one entry, so calling it a chain may be a stretch)
 556  * It should ONLY be called when getaddrinfo() and friends
 557  * aren't available, OR when dealing with a non IP protocol
 558  * family, such as AF_UNIX
 559  *
 560  * the return value is 1 on success, or 0 on failure, which
 561  * only happens if a memory allocation error occurred.
 562  */
 563 static int addrinfo_wrap(int family, int socktype,
 564                          const void *where, size_t wherelen,
 565                          unsigned short port,
 566                          BIO_ADDRINFO **bai)
 567 {
 568     *bai = OPENSSL_zalloc(sizeof(**bai));
 569     if (*bai == NULL)
 570         return 0;
 571
 572     (*bai)->bai_family = family;
 573     (*bai)->bai_socktype = socktype;
 574     if (socktype == SOCK_STREAM)
 575         (*bai)->bai_protocol = IPPROTO_TCP;
 576     if (socktype == SOCK_DGRAM)
 577         (*bai)->bai_protocol = IPPROTO_UDP;
 578 #ifdef AF_UNIX
 579     if (family == AF_UNIX)
 580         (*bai)->bai_protocol = 0;
 581 #endif
 582     {
 583         /* Magic: We know that BIO_ADDR_sockaddr_noconst is really
 584            just an advanced cast of BIO_ADDR* to struct sockaddr *
 585            by the power of union, so while it may seem that we're
 586            creating a memory leak here, we are not.  It will be
 587            all right. */
 588         BIO_ADDR *addr = BIO_ADDR_new();
 589         if (addr != NULL) {
 590             BIO_ADDR_rawmake(addr, family, where, wherelen, port);
 591             (*bai)->bai_addr = BIO_ADDR_sockaddr_noconst(addr);
 592         }
 593     }
 594     (*bai)->bai_next = NULL;
 595     if ((*bai)->bai_addr == NULL) {
 596         BIO_ADDRINFO_free(*bai);
 597         *bai = NULL;
 598         return 0;
 599     }
 600     return 1;
 601 }
 602
 603 DEFINE_RUN_ONCE_STATIC(do_bio_lookup_init)
 604 {
 605     OPENSSL_init_crypto(0, NULL);
 606     bio_lookup_lock = CRYPTO_THREAD_lock_new();
 607     return bio_lookup_lock != NULL;
 608 }
 609
 610 int BIO_lookup(const char *host, const char *service,
 611                enum BIO_lookup_type lookup_type,
 612                int family, int socktype, BIO_ADDRINFO **res)
 613 {
 614     return BIO_lookup_ex(host, service, lookup_type, family, socktype, 0, res);
 615 }
 616
 617 /*-
 618  * BIO_lookup_ex - look up the node and service you want to connect to.
 619  * @node: the node you want to connect to.
 620  * @service: the service you want to connect to.
 621  * @lookup_type: declare intent with the result, client or server.
 622  * @family: the address family you want to use.  Use AF_UNSPEC for any, or
 623  *  AF_INET, AF_INET6 or AF_UNIX.
 624  * @socktype: The socket type you want to use.  Can be SOCK_STREAM, SOCK_DGRAM
 625  *  or 0 for all.
 626  * @protocol: The protocol to use, e.g. IPPROTO_TCP or IPPROTO_UDP or 0 for all.
 627  *            Note that some platforms may not return IPPROTO_SCTP without
 628  *            explicitly requesting it (i.e. IPPROTO_SCTP may not be returned
 629  *            with 0 for the protocol)
 630  * @res: Storage place for the resulting list of returned addresses
 631  *
 632  * This will do a lookup of the node and service that you want to connect to.
 633  * It returns a linked list of different addresses you can try to connect to.
 634  *
 635  * When no longer needed you should call BIO_ADDRINFO_free() to free the result.
 636  *
 637  * The return value is 1 on success or 0 in case of error.
 638  */
 639 int BIO_lookup_ex(const char *host, const char *service, int lookup_type,
 640                   int family, int socktype, int protocol, BIO_ADDRINFO **res)
 641 {
 642     int ret = 0;                 /* Assume failure */
 643
 644     switch(family) {
 645     case AF_INET:
 646 #ifdef AF_INET6
 647     case AF_INET6:
 648 #endif
 649 #ifdef AF_UNIX
 650     case AF_UNIX:
 651 #endif
 652 #ifdef AF_UNSPEC
 653     case AF_UNSPEC:
 654 #endif
 655         break;
 656     default:
 657         BIOerr(BIO_F_BIO_LOOKUP_EX, BIO_R_UNSUPPORTED_PROTOCOL_FAMILY);
 658         return 0;
 659     }
 660
 661 #ifdef AF_UNIX
 662     if (family == AF_UNIX) {
 663         if (addrinfo_wrap(family, socktype, host, strlen(host), 0, res))
 664             return 1;
 665         else
 666             BIOerr(BIO_F_BIO_LOOKUP_EX, ERR_R_MALLOC_FAILURE);
 667         return 0;
 668     }
 669 #endif
 670
 671     if (BIO_sock_init() != 1)
 672         return 0;
 673
 674     if (1) {
 675 #ifdef AI_PASSIVE
 676         int gai_ret = 0;
 677         struct addrinfo hints;
 678
 679         memset(&hints, 0, sizeof hints);
 680
 681         hints.ai_family = family;
 682         hints.ai_socktype = socktype;
 683         hints.ai_protocol = protocol;
 684
 685         if (lookup_type == BIO_LOOKUP_SERVER)
 686             hints.ai_flags |= AI_PASSIVE;
 687
 688         /* Note that |res| SHOULD be a 'struct addrinfo **' thanks to
 689          * macro magic in bio_lcl.h
 690          */
 691         switch ((gai_ret = getaddrinfo(host, service, &hints, res))) {
 692 # ifdef EAI_SYSTEM
 693         case EAI_SYSTEM:
 694             SYSerr(SYS_F_GETADDRINFO, get_last_socket_error());
 695             BIOerr(BIO_F_BIO_LOOKUP_EX, ERR_R_SYS_LIB);
 696             break;
 697 # endif
 698         case 0:
 699             ret = 1;             /* Success */
 700             break;
 701         default:
 702             BIOerr(BIO_F_BIO_LOOKUP_EX, ERR_R_SYS_LIB);
 703             ERR_add_error_data(1, gai_strerror(gai_ret));
 704             break;
 705         }
 706     } else {
 707 #endif
 708         const struct hostent *he;
 709 /*
 710  * Because struct hostent is defined for 32-bit pointers only with
 711  * VMS C, we need to make sure that '&he_fallback_address' and
 712  * '&he_fallback_addresses' are 32-bit pointers
 713  */
 714 #if defined(OPENSSL_SYS_VMS) && defined(__DECC)
 715 # pragma pointer_size save
 716 # pragma pointer_size 32
 717 #endif
 718         /* Windows doesn't seem to have in_addr_t */
 719 #ifdef OPENSSL_SYS_WINDOWS
 720         static uint32_t he_fallback_address;
 721         static const char *he_fallback_addresses[] =
 722             { (char *)&he_fallback_address, NULL };
 723 #else
 724         static in_addr_t he_fallback_address;
 725         static const char *he_fallback_addresses[] =
 726             { (char *)&he_fallback_address, NULL };
 727 #endif
 728         static const struct hostent he_fallback =
 729             { NULL, NULL, AF_INET, sizeof(he_fallback_address),
 730               (char **)&he_fallback_addresses };
 731 #if defined(OPENSSL_SYS_VMS) && defined(__DECC)
 732 # pragma pointer_size restore
 733 #endif
 734
 735         struct servent *se;
 736         /* Apparently, on WIN64, s_proto and s_port have traded places... */
 737 #ifdef _WIN64
 738         struct servent se_fallback = { NULL, NULL, NULL, 0 };
 739 #else
 740         struct servent se_fallback = { NULL, NULL, 0, NULL };
 741 #endif
 742
 743         if (!RUN_ONCE(&bio_lookup_init, do_bio_lookup_init)) {
 744             BIOerr(BIO_F_BIO_LOOKUP_EX, ERR_R_MALLOC_FAILURE);
 745             ret = 0;
 746             goto err;
 747         }
 748
 749         CRYPTO_THREAD_write_lock(bio_lookup_lock);
 750         he_fallback_address = INADDR_ANY;
 751         if (host == NULL) {
 752             he = &he_fallback;
 753             switch(lookup_type) {
 754             case BIO_LOOKUP_CLIENT:
 755                 he_fallback_address = INADDR_LOOPBACK;
 756                 break;
 757             case BIO_LOOKUP_SERVER:
 758                 he_fallback_address = INADDR_ANY;
 759                 break;
 760             default:
 761                 /* We forgot to handle a lookup type! */
 762                 assert("We forgot to handle a lookup type!" == NULL);
 763                 BIOerr(BIO_F_BIO_LOOKUP_EX, ERR_R_INTERNAL_ERROR);
 764                 ret = 0;
 765                 goto err;
 766             }
 767         } else {
 768             he = gethostbyname(host);
 769
 770             if (he == NULL) {
 771 #ifndef OPENSSL_SYS_WINDOWS
 772                 /*
 773                  * This might be misleading, because h_errno is used as if
 774                  * it was errno. To minimize mixup add 1000. Underlying
 775                  * reason for this is that hstrerror is declared obsolete,
 776                  * not to mention that a) h_errno is not always guaranteed
 777                  * to be meaningless; b) hstrerror can reside in yet another
 778                  * library, linking for sake of hstrerror is an overkill;
 779                  * c) this path is not executed on contemporary systems
 780                  * anyway [above getaddrinfo/gai_strerror is]. We just let
 781                  * system administrator figure this out...
 782                  */
 783                 SYSerr(SYS_F_GETHOSTBYNAME, 1000 + h_errno);
 784 #else
 785                 SYSerr(SYS_F_GETHOSTBYNAME, WSAGetLastError());
 786 #endif
 787                 ret = 0;
 788                 goto err;
 789             }
 790         }
 791
 792         if (service == NULL) {
 793             se_fallback.s_port = 0;
 794             se_fallback.s_proto = NULL;
 795             se = &se_fallback;
 796         } else {
 797             char *endp = NULL;
 798             long portnum = strtol(service, &endp, 10);
 799
 800 /*
 801  * Because struct servent is defined for 32-bit pointers only with
 802  * VMS C, we need to make sure that 'proto' is a 32-bit pointer.
 803  */
 804 #if defined(OPENSSL_SYS_VMS) && defined(__DECC)
 805 # pragma pointer_size save
 806 # pragma pointer_size 32
 807 #endif
 808             char *proto = NULL;
 809 #if defined(OPENSSL_SYS_VMS) && defined(__DECC)
 810 # pragma pointer_size restore
 811 #endif
 812
 813             switch (socktype) {
 814             case SOCK_STREAM:
 815                 proto = "tcp";
 816                 break;
 817             case SOCK_DGRAM:
 818                 proto = "udp";
 819                 break;
 820             }
 821
 822             if (endp != service && *endp == '\0'
 823                     && portnum > 0 && portnum < 65536) {
 824                 se_fallback.s_port = htons(portnum);
 825                 se_fallback.s_proto = proto;
 826                 se = &se_fallback;
 827             } else if (endp == service) {
 828                 se = getservbyname(service, proto);
 829
 830                 if (se == NULL) {
 831 #ifndef OPENSSL_SYS_WINDOWS
 832                     SYSerr(SYS_F_GETSERVBYNAME, errno);
 833 #else
 834                     SYSerr(SYS_F_GETSERVBYNAME, WSAGetLastError());
 835 #endif
 836                     goto err;
 837                 }
 838             } else {
 839                 BIOerr(BIO_F_BIO_LOOKUP_EX, BIO_R_MALFORMED_HOST_OR_SERVICE);
 840                 goto err;
 841             }
 842         }
 843
 844         *res = NULL;
 845
 846         {
 847 /*
 848  * Because hostent::h_addr_list is an array of 32-bit pointers with VMS C,
 849  * we must make sure our iterator designates the same element type, hence
 850  * the pointer size dance.
 851  */
 852 #if defined(OPENSSL_SYS_VMS) && defined(__DECC)
 853 # pragma pointer_size save
 854 # pragma pointer_size 32
 855 #endif
 856             char **addrlistp;
 857 #if defined(OPENSSL_SYS_VMS) && defined(__DECC)
 858 # pragma pointer_size restore
 859 #endif
 860             size_t addresses;
 861             BIO_ADDRINFO *tmp_bai = NULL;
 862
 863             /* The easiest way to create a linked list from an
 864                array is to start from the back */
 865             for(addrlistp = he->h_addr_list; *addrlistp != NULL;
 866                 addrlistp++)
 867                 ;
 868
 869             for(addresses = addrlistp - he->h_addr_list;
 870                 addrlistp--, addresses-- > 0; ) {
 871                 if (!addrinfo_wrap(he->h_addrtype, socktype,
 872                                    *addrlistp, he->h_length,
 873                                    se->s_port, &tmp_bai))
 874                     goto addrinfo_malloc_err;
 875                 tmp_bai->bai_next = *res;
 876                 *res = tmp_bai;
 877                 continue;
 878              addrinfo_malloc_err:
 879                 BIO_ADDRINFO_free(*res);
 880                 *res = NULL;
 881                 BIOerr(BIO_F_BIO_LOOKUP_EX, ERR_R_MALLOC_FAILURE);
 882                 ret = 0;
 883                 goto err;
 884             }
 885
 886             ret = 1;
 887         }
 888      err:
 889         CRYPTO_THREAD_unlock(bio_lookup_lock);
 890     }
 891
 892     return ret;
 893 }
 894
 895 #endif /* OPENSSL_NO_SOCK */