stdlib/ext/socket/getaddrinfo.c

   1 /*
   2  * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. Neither the name of the project nor the names of its contributors
  14  *    may be used to endorse or promote products derived from this software
  15  *    without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  */
  29
  30 /*
  31  * "#ifdef FAITH" part is local hack for supporting IPv4-v6 translator.
  32  *
  33  * Issues to be discussed:
  34  * - Thread safe-ness must be checked.
  35  * - Return values.  There are nonstandard return values defined and used
  36  *   in the source code.  This is because RFC2133 is silent about which error
  37  *   code must be returned for which situation.
  38  * - PF_UNSPEC case would be handled in getipnodebyname() with the AI_ALL flag.
  39  */
  40
  41 #include "config.h"
  42 #include <sys/types.h>
  43 #if !defined(_WIN32) && !defined(__VMS)
  44 #include <sys/param.h>
  45 #if defined(__BEOS__)
  46 # include <net/socket.h>
  47 #else
  48 # include <sys/socket.h>
  49 #endif
  50 #include <netinet/in.h>
  51 #if defined(HAVE_ARPA_INET_H)
  52 #include <arpa/inet.h>
  53 #endif
  54 #if defined(HAVE_ARPA_NAMESER_H)
  55 #include <arpa/nameser.h>
  56 #endif
  57 #include <netdb.h>
  58 #if defined(HAVE_RESOLV_H)
  59 #ifdef _SX
  60 #include <stdio.h>
  61 #endif
  62 #include <resolv.h>
  63 #endif
  64 #include <unistd.h>
  65 #elif defined(__VMS )
  66 #include <socket.h>
  67 #include <inet.h>
  68 #include <in.h>
  69 #include <netdb.h>
  70 #else
  71 #include <winsock2.h>
  72 #include <io.h>
  73 #endif
  74 #include <string.h>
  75 #include <stdio.h>
  76 #include <stdlib.h>
  77 #include <stddef.h>
  78 #include <ctype.h>
  79
  80 #ifdef SOCKS5
  81 #include <socks.h>
  82 #endif
  83
  84 #include "addrinfo.h"
  85 #include "sockport.h"
  86
  87 #if defined(__KAME__) && defined(INET6)
  88 # define FAITH
  89 #endif
  90
  91 #define SUCCESS 0
  92 #define ANY 0
  93 #define YES 1
  94 #define NO  0
  95
  96 #ifdef FAITH
  97 static int translate = NO;
  98 static struct in6_addr faith_prefix = IN6ADDR_ANY_INIT;
  99 #endif
 100
 101 static const char in_addrany[] = { 0, 0, 0, 0 };
 102 static const char in6_addrany[] = {
 103         0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
 104 };
 105 static const char in_loopback[] = { 127, 0, 0, 1 };
 106 static const char in6_loopback[] = {
 107         0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1
 108 };
 109
 110 struct sockinet {
 111         u_char  si_len;
 112         u_char  si_family;
 113         u_short si_port;
 114 };
 115
 116 static const struct afd {
 117         int a_af;
 118         int a_addrlen;
 119         int a_socklen;
 120         int a_off;
 121         const char *a_addrany;
 122         const char *a_loopback;
 123 } afdl [] = {
 124 #ifdef INET6
 125 #define N_INET6 0
 126         {PF_INET6, sizeof(struct in6_addr),
 127          sizeof(struct sockaddr_in6),
 128          offsetof(struct sockaddr_in6, sin6_addr),
 129          in6_addrany, in6_loopback},
 130 #define N_INET  1
 131 #else
 132 #define N_INET  0
 133 #endif
 134         {PF_INET, sizeof(struct in_addr),
 135          sizeof(struct sockaddr_in),
 136          offsetof(struct sockaddr_in, sin_addr),
 137          in_addrany, in_loopback},
 138         {0, 0, 0, 0, NULL, NULL},
 139 };
 140
 141 #ifdef INET6
 142 #define PTON_MAX        16
 143 #else
 144 #define PTON_MAX        4
 145 #endif
 146
 147 static int get_name __P((const char *, const struct afd *,
 148                           struct addrinfo **, char *, struct addrinfo *,
 149                           int));
 150 static int get_addr __P((const char *, int, struct addrinfo **,
 151                         struct addrinfo *, int));
 152 static int str_isnumber __P((const char *));
 153
 154 static const char *const ai_errlist[] = {
 155         "success.",
 156         "address family for hostname not supported.",   /* EAI_ADDRFAMILY */
 157         "temporary failure in name resolution.",        /* EAI_AGAIN      */
 158         "invalid value for ai_flags.",                  /* EAI_BADFLAGS   */
 159         "non-recoverable failure in name resolution.",  /* EAI_FAIL       */
 160         "ai_family not supported.",                     /* EAI_FAMILY     */
 161         "memory allocation failure.",                   /* EAI_MEMORY     */
 162         "no address associated with hostname.",         /* EAI_NODATA     */
 163         "hostname nor servname provided, or not known.",/* EAI_NONAME     */
 164         "servname not supported for ai_socktype.",      /* EAI_SERVICE    */
 165         "ai_socktype not supported.",                   /* EAI_SOCKTYPE   */
 166         "system error returned in errno.",              /* EAI_SYSTEM     */
 167         "invalid value for hints.",                     /* EAI_BADHINTS   */
 168         "resolved protocol is unknown.",                /* EAI_PROTOCOL   */
 169         "unknown error.",                               /* EAI_MAX        */
 170 };
 171
 172 #define GET_CANONNAME(ai, str) \
 173 if (pai->ai_flags & AI_CANONNAME) {\
 174         if (((ai)->ai_canonname = (char *)malloc(strlen(str) + 1)) != NULL) {\
 175                 strcpy((ai)->ai_canonname, (str));\
 176         } else {\
 177                 error = EAI_MEMORY;\
 178                 goto free;\
 179         }\
 180 }
 181
 182 #define GET_AI(ai, afd, addr, port) {\
 183         char *p;\
 184         if (((ai) = (struct addrinfo *)malloc(sizeof(struct addrinfo) +\
 185                                               ((afd)->a_socklen)))\
 186             == NULL) {\
 187                 error = EAI_MEMORY;\
 188                 goto free;\
 189         }\
 190         memcpy(ai, pai, sizeof(struct addrinfo));\
 191         (ai)->ai_addr = (struct sockaddr *)((ai) + 1);\
 192         memset((ai)->ai_addr, 0, (afd)->a_socklen);\
 193         SET_SA_LEN((ai)->ai_addr, (ai)->ai_addrlen = (afd)->a_socklen);\
 194         (ai)->ai_addr->sa_family = (ai)->ai_family = (afd)->a_af;\
 195         ((struct sockinet *)(ai)->ai_addr)->si_port = port;\
 196         p = (char *)((ai)->ai_addr);\
 197         memcpy(p + (afd)->a_off, (addr), (afd)->a_addrlen);\
 198 }
 199
 200 #define ERR(err) { error = (err); goto bad; }
 201
 202 #if defined __UCLIBC__
 203 const
 204 #endif
 205 char *
 206 gai_strerror(ecode)
 207         int ecode;
 208 {
 209         if (ecode < 0 || ecode > EAI_MAX)
 210                 ecode = EAI_MAX;
 211         return (char *)ai_errlist[ecode];
 212 }
 213
 214 void
 215 freeaddrinfo(ai)
 216         struct addrinfo *ai;
 217 {
 218         struct addrinfo *next;
 219
 220         do {
 221                 next = ai->ai_next;
 222                 if (ai->ai_canonname)
 223                         free(ai->ai_canonname);
 224                 /* no need to free(ai->ai_addr) */
 225                 free(ai);
 226         } while ((ai = next) != NULL);
 227 }
 228
 229 static int
 230 str_isnumber(p)
 231         const char *p;
 232 {
 233         char *q = (char *)p;
 234         while (*q) {
 235                 if (! isdigit(*q))
 236                         return NO;
 237                 q++;
 238         }
 239         return YES;
 240 }
 241
 242 #ifndef HAVE_INET_PTON
 243
 244 static int
 245 inet_pton(af, hostname, pton)
 246         int af;
 247         const char *hostname;
 248         void *pton;
 249 {
 250         struct in_addr in;
 251
 252 #ifdef HAVE_INET_ATON
 253         if (!inet_aton(hostname, &in))
 254             return 0;
 255 #else
 256         int d1, d2, d3, d4;
 257         char ch;
 258
 259         if (sscanf(hostname, "%d.%d.%d.%d%c", &d1, &d2, &d3, &d4, &ch) == 4 &&
 260             0 <= d1 && d1 <= 255 && 0 <= d2 && d2 <= 255 &&
 261             0 <= d3 && d3 <= 255 && 0 <= d4 && d4 <= 255) {
 262             in.s_addr = htonl(
 263                 ((long) d1 << 24) | ((long) d2 << 16) |
 264                 ((long) d3 << 8) | ((long) d4 << 0));
 265         }
 266         else {
 267             return 0;
 268         }
 269 #endif
 270         memcpy(pton, &in, sizeof(in));
 271         return 1;
 272 }
 273 #endif
 274
 275 int
 276 getaddrinfo(hostname, servname, hints, res)
 277         const char *hostname, *servname;
 278         const struct addrinfo *hints;
 279         struct addrinfo **res;
 280 {
 281         struct addrinfo sentinel;
 282         struct addrinfo *top = NULL;
 283         struct addrinfo *cur;
 284         int i, error = 0;
 285         char pton[PTON_MAX];
 286         struct addrinfo ai;
 287         struct addrinfo *pai;
 288         u_short port;
 289
 290 #ifdef FAITH
 291         static int firsttime = 1;
 292
 293         if (firsttime) {
 294                 /* translator hack */
 295                 {
 296                         char *q = getenv("GAI");
 297                         if (q && inet_pton(AF_INET6, q, &faith_prefix) == 1)
 298                                 translate = YES;
 299                 }
 300                 firsttime = 0;
 301         }
 302 #endif
 303
 304         /* initialize file static vars */
 305         sentinel.ai_next = NULL;
 306         cur = &sentinel;
 307         pai = &ai;
 308         pai->ai_flags = 0;
 309         pai->ai_family = PF_UNSPEC;
 310         pai->ai_socktype = ANY;
 311         pai->ai_protocol = ANY;
 312         pai->ai_addrlen = 0;
 313         pai->ai_canonname = NULL;
 314         pai->ai_addr = NULL;
 315         pai->ai_next = NULL;
 316         port = ANY;
 317
 318         if (hostname == NULL && servname == NULL)
 319                 return EAI_NONAME;
 320         if (hints) {
 321                 /* error check for hints */
 322                 if (hints->ai_addrlen || hints->ai_canonname ||
 323                     hints->ai_addr || hints->ai_next)
 324                         ERR(EAI_BADHINTS); /* xxx */
 325                 if (hints->ai_flags & ~AI_MASK)
 326                         ERR(EAI_BADFLAGS);
 327                 switch (hints->ai_family) {
 328                 case PF_UNSPEC:
 329                 case PF_INET:
 330 #ifdef INET6
 331                 case PF_INET6:
 332 #endif
 333                         break;
 334                 default:
 335                         ERR(EAI_FAMILY);
 336                 }
 337                 memcpy(pai, hints, sizeof(*pai));
 338                 switch (pai->ai_socktype) {
 339                 case ANY:
 340                         switch (pai->ai_protocol) {
 341                         case ANY:
 342                                 break;
 343                         case IPPROTO_UDP:
 344                                 pai->ai_socktype = SOCK_DGRAM;
 345                                 break;
 346                         case IPPROTO_TCP:
 347                                 pai->ai_socktype = SOCK_STREAM;
 348                                 break;
 349                         default:
 350 #if defined(SOCK_RAW)
 351                                 pai->ai_socktype = SOCK_RAW;
 352 #endif
 353                                 break;
 354                         }
 355                         break;
 356 #if defined(SOCK_RAW)
 357                 case SOCK_RAW:
 358                         break;
 359 #endif
 360                 case SOCK_DGRAM:
 361                         if (pai->ai_protocol != IPPROTO_UDP &&
 362                             pai->ai_protocol != ANY)
 363                                 ERR(EAI_BADHINTS);      /*xxx*/
 364                         pai->ai_protocol = IPPROTO_UDP;
 365                         break;
 366                 case SOCK_STREAM:
 367                         if (pai->ai_protocol != IPPROTO_TCP &&
 368                             pai->ai_protocol != ANY)
 369                                 ERR(EAI_BADHINTS);      /*xxx*/
 370                         pai->ai_protocol = IPPROTO_TCP;
 371                         break;
 372                 default:
 373                         ERR(EAI_SOCKTYPE);
 374                         break;
 375                 }
 376         }
 377
 378         /*
 379          * service port
 380          */
 381         if (servname) {
 382                 if (str_isnumber(servname)) {
 383                         if (pai->ai_socktype == ANY) {
 384                                 /* caller accept *ANY* socktype */
 385                                 pai->ai_socktype = SOCK_DGRAM;
 386                                 pai->ai_protocol = IPPROTO_UDP;
 387                         }
 388                         port = htons((unsigned short)atoi(servname));
 389                 } else {
 390                         struct servent *sp;
 391                         char *proto;
 392
 393                         proto = NULL;
 394                         switch (pai->ai_socktype) {
 395                         case ANY:
 396                                 proto = NULL;
 397                                 break;
 398                         case SOCK_DGRAM:
 399                                 proto = "udp";
 400                                 break;
 401                         case SOCK_STREAM:
 402                                 proto = "tcp";
 403                                 break;
 404                         default:
 405                                 fprintf(stderr, "panic!\n");
 406                                 break;
 407                         }
 408                         if ((sp = getservbyname((char*)servname, proto)) == NULL)
 409                                 ERR(EAI_SERVICE);
 410                         port = sp->s_port;
 411                         if (pai->ai_socktype == ANY)
 412                                 if (strcmp(sp->s_proto, "udp") == 0) {
 413                                         pai->ai_socktype = SOCK_DGRAM;
 414                                         pai->ai_protocol = IPPROTO_UDP;
 415                                 } else if (strcmp(sp->s_proto, "tcp") == 0) {
 416                                         pai->ai_socktype = SOCK_STREAM;
 417                                         pai->ai_protocol = IPPROTO_TCP;
 418                                 } else
 419                                         ERR(EAI_PROTOCOL);      /*xxx*/
 420                 }
 421         }
 422
 423         /*
 424          * hostname == NULL.
 425          * passive socket -> anyaddr (0.0.0.0 or ::)
 426          * non-passive socket -> localhost (127.0.0.1 or ::1)
 427          */
 428         if (hostname == NULL) {
 429                 const struct afd *afd;
 430                 int s;
 431
 432                 for (afd = &afdl[0]; afd->a_af; afd++) {
 433                         if (!(pai->ai_family == PF_UNSPEC
 434                            || pai->ai_family == afd->a_af)) {
 435                                 continue;
 436                         }
 437
 438                         /*
 439                          * filter out AFs that are not supported by the kernel
 440                          * XXX errno?
 441                          */
 442                         s = socket(afd->a_af, SOCK_DGRAM, 0);
 443                         if (s < 0)
 444                                 continue;
 445 #if defined(HAVE_CLOSESOCKET)
 446                         closesocket(s);
 447 #else
 448                         close(s);
 449 #endif
 450
 451                         if (pai->ai_flags & AI_PASSIVE) {
 452                                 GET_AI(cur->ai_next, afd, afd->a_addrany, port);
 453                                 /* xxx meaningless?
 454                                  * GET_CANONNAME(cur->ai_next, "anyaddr");
 455                                  */
 456                         } else {
 457                                 GET_AI(cur->ai_next, afd, afd->a_loopback,
 458                                         port);
 459                                 /* xxx meaningless?
 460                                  * GET_CANONNAME(cur->ai_next, "localhost");
 461                                  */
 462                         }
 463                         cur = cur->ai_next;
 464                 }
 465                 top = sentinel.ai_next;
 466                 if (top)
 467                         goto good;
 468                 else
 469                         ERR(EAI_FAMILY);
 470         }
 471
 472         /* hostname as numeric name */
 473         for (i = 0; afdl[i].a_af; i++) {
 474                 if (inet_pton(afdl[i].a_af, hostname, pton)) {
 475                         u_long v4a;
 476 #ifdef INET6
 477                         u_char pfx;
 478 #endif
 479
 480                         switch (afdl[i].a_af) {
 481                         case AF_INET:
 482                                 v4a = ((struct in_addr *)pton)->s_addr;
 483                                 if (IN_MULTICAST(v4a) || IN_EXPERIMENTAL(v4a))
 484                                         pai->ai_flags &= ~AI_CANONNAME;
 485                                 v4a >>= IN_CLASSA_NSHIFT;
 486                                 if (v4a == 0 || v4a == IN_LOOPBACKNET)
 487                                         pai->ai_flags &= ~AI_CANONNAME;
 488                                 break;
 489 #ifdef INET6
 490                         case AF_INET6:
 491 #ifdef HAVE_ADDR8
 492                                 pfx = ((struct in6_addr *)pton)->s6_addr8[0];
 493 #else
 494                                 pfx = ((struct in6_addr *)pton)->s6_addr[0];
 495 #endif
 496                                 if (pfx == 0 || pfx == 0xfe || pfx == 0xff)
 497                                         pai->ai_flags &= ~AI_CANONNAME;
 498                                 break;
 499 #endif
 500                         }
 501
 502                         if (pai->ai_family == afdl[i].a_af ||
 503                             pai->ai_family == PF_UNSPEC) {
 504                                 if (! (pai->ai_flags & AI_CANONNAME)) {
 505                                         GET_AI(top, &afdl[i], pton, port);
 506                                         goto good;
 507                                 }
 508                                 /*
 509                                  * if AI_CANONNAME and if reverse lookup
 510                                  * fail, return ai anyway to pacify
 511                                  * calling application.
 512                                  *
 513                                  * XXX getaddrinfo() is a name->address
 514                                  * translation function, and it looks strange
 515                                  * that we do addr->name translation here.
 516                                  */
 517                                 get_name(pton, &afdl[i], &top, pton, pai, port);
 518                                 goto good;
 519                         } else
 520                                 ERR(EAI_FAMILY);        /*xxx*/
 521                 }
 522         }
 523
 524         if (pai->ai_flags & AI_NUMERICHOST)
 525                 ERR(EAI_NONAME);
 526
 527         /* hostname as alphabetical name */
 528         error = get_addr(hostname, pai->ai_family, &top, pai, port);
 529         if (error == 0) {
 530                 if (top) {
 531  good:
 532                         *res = top;
 533                         return SUCCESS;
 534                 } else
 535                         error = EAI_FAIL;
 536         }
 537  free:
 538         if (top)
 539                 freeaddrinfo(top);
 540  bad:
 541         *res = NULL;
 542         return error;
 543 }
 544
 545 static int
 546 get_name(addr, afd, res, numaddr, pai, port0)
 547         const char *addr;
 548         const struct afd *afd;
 549         struct addrinfo **res;
 550         char *numaddr;
 551         struct addrinfo *pai;
 552         int port0;
 553 {
 554         u_short port = port0 & 0xffff;
 555         struct hostent *hp;
 556         struct addrinfo *cur;
 557         int error = 0;
 558 #ifdef INET6
 559         int h_error;
 560 #endif
 561
 562 #ifdef INET6
 563         hp = getipnodebyaddr(addr, afd->a_addrlen, afd->a_af, &h_error);
 564 #else
 565         hp = gethostbyaddr((char*)addr, afd->a_addrlen, AF_INET);
 566 #endif
 567         if (hp && hp->h_name && hp->h_name[0] && hp->h_addr_list[0]) {
 568                 GET_AI(cur, afd, hp->h_addr_list[0], port);
 569                 GET_CANONNAME(cur, hp->h_name);
 570         } else
 571                 GET_AI(cur, afd, numaddr, port);
 572
 573 #ifdef INET6
 574         if (hp)
 575                 freehostent(hp);
 576 #endif
 577         *res = cur;
 578         return SUCCESS;
 579  free:
 580         if (cur)
 581                 freeaddrinfo(cur);
 582 #ifdef INET6
 583         if (hp)
 584                 freehostent(hp);
 585 #endif
 586  /* bad: */
 587         *res = NULL;
 588         return error;
 589 }
 590
 591 static int
 592 get_addr(hostname, af, res, pai, port0)
 593         const char *hostname;
 594         int af;
 595         struct addrinfo **res;
 596         struct addrinfo *pai;
 597         int port0;
 598 {
 599         u_short port = port0 & 0xffff;
 600         struct addrinfo sentinel;
 601         struct hostent *hp;
 602         struct addrinfo *top, *cur;
 603         const struct afd *afd;
 604         int i, error = 0, h_error;
 605         char *ap;
 606
 607         top = NULL;
 608         sentinel.ai_next = NULL;
 609         cur = &sentinel;
 610 #ifdef INET6
 611         if (af == AF_UNSPEC) {
 612                 hp = getipnodebyname(hostname, AF_INET6,
 613                                 AI_ADDRCONFIG|AI_ALL|AI_V4MAPPED, &h_error);
 614         } else
 615                 hp = getipnodebyname(hostname, af, AI_ADDRCONFIG, &h_error);
 616 #else
 617         hp = gethostbyname((char*)hostname);
 618         h_error = h_errno;
 619 #endif
 620         if (hp == NULL) {
 621                 switch (h_error) {
 622                 case HOST_NOT_FOUND:
 623                 case NO_DATA:
 624                         error = EAI_NODATA;
 625                         break;
 626                 case TRY_AGAIN:
 627                         error = EAI_AGAIN;
 628                         break;
 629                 case NO_RECOVERY:
 630                 default:
 631                         error = EAI_FAIL;
 632                         break;
 633                 }
 634                 goto bad;
 635         }
 636
 637         if ((hp->h_name == NULL) || (hp->h_name[0] == 0) ||
 638             (hp->h_addr_list[0] == NULL))
 639                 ERR(EAI_FAIL);
 640
 641         for (i = 0; (ap = hp->h_addr_list[i]) != NULL; i++) {
 642                 switch (af) {
 643 #ifdef INET6
 644                 case AF_INET6:
 645                         afd = &afdl[N_INET6];
 646                         break;
 647 #endif
 648 #ifndef INET6
 649                 default:        /* AF_UNSPEC */
 650 #endif
 651                 case AF_INET:
 652                         afd = &afdl[N_INET];
 653                         break;
 654 #ifdef INET6
 655                 default:        /* AF_UNSPEC */
 656                         if (IN6_IS_ADDR_V4MAPPED((struct in6_addr *)ap)) {
 657                                 ap += sizeof(struct in6_addr) -
 658                                         sizeof(struct in_addr);
 659                                 afd = &afdl[N_INET];
 660                         } else
 661                                 afd = &afdl[N_INET6];
 662                         break;
 663 #endif
 664                 }
 665 #ifdef FAITH
 666                 if (translate && afd->a_af == AF_INET) {
 667                         struct in6_addr *in6;
 668
 669                         GET_AI(cur->ai_next, &afdl[N_INET6], ap, port);
 670                         in6 = &((struct sockaddr_in6 *)cur->ai_next->ai_addr)->sin6_addr;
 671                         memcpy(&in6->s6_addr32[0], &faith_prefix,
 672                             sizeof(struct in6_addr) - sizeof(struct in_addr));
 673                         memcpy(&in6->s6_addr32[3], ap, sizeof(struct in_addr));
 674                 } else
 675 #endif /* FAITH */
 676                 GET_AI(cur->ai_next, afd, ap, port);
 677                 if (cur == &sentinel) {
 678                         top = cur->ai_next;
 679                         GET_CANONNAME(top, hp->h_name);
 680                 }
 681                 cur = cur->ai_next;
 682         }
 683 #ifdef INET6
 684         freehostent(hp);
 685 #endif
 686         *res = top;
 687         return SUCCESS;
 688  free:
 689         if (top)
 690                 freeaddrinfo(top);
 691 #ifdef INET6
 692         if (hp)
 693                 freehostent(hp);
 694 #endif
 695  bad:
 696         *res = NULL;
 697         return error;
 698 }