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 "ruby/config.h"
  42 #include <sys/types.h>
  43 #ifndef _WIN32
  44 #include <sys/param.h>
  45 #if defined(__BEOS__) && !defined(__HAIKU__)
  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 #else
  66 #include <winsock2.h>
  67 #include <io.h>
  68 #endif
  69 #include <string.h>
  70 #include <stdio.h>
  71 #include <stdlib.h>
  72 #include <stddef.h>
  73 #include <ctype.h>
  74
  75 #ifdef SOCKS5
  76 #include <socks.h>
  77 #endif
  78
  79 #include "addrinfo.h"
  80 #include "sockport.h"
  81
  82 #if defined(__KAME__) && defined(INET6)
  83 # define FAITH
  84 #endif
  85
  86 #define SUCCESS 0
  87 #define ANY 0
  88 #define YES 1
  89 #define NO  0
  90
  91 #ifdef FAITH
  92 static int translate = NO;
  93 static struct in6_addr faith_prefix = IN6ADDR_ANY_INIT;
  94 #endif
  95
  96 static const char in_addrany[] = { 0, 0, 0, 0 };
  97 static const char in6_addrany[] = {
  98         0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
  99 };
 100 static const char in_loopback[] = { 127, 0, 0, 1 };
 101 static const char in6_loopback[] = {
 102         0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1
 103 };
 104
 105 struct sockinet {
 106         u_char  si_len;
 107         u_char  si_family;
 108         u_short si_port;
 109 };
 110
 111 static const struct afd {
 112         int a_af;
 113         int a_addrlen;
 114         int a_socklen;
 115         int a_off;
 116         const char *a_addrany;
 117         const char *a_loopback;
 118 } afdl [] = {
 119 #ifdef INET6
 120 #define N_INET6 0
 121         {PF_INET6, sizeof(struct in6_addr),
 122          sizeof(struct sockaddr_in6),
 123          offsetof(struct sockaddr_in6, sin6_addr),
 124          in6_addrany, in6_loopback},
 125 #define N_INET  1
 126 #else
 127 #define N_INET  0
 128 #endif
 129         {PF_INET, sizeof(struct in_addr),
 130          sizeof(struct sockaddr_in),
 131          offsetof(struct sockaddr_in, sin_addr),
 132          in_addrany, in_loopback},
 133         {0, 0, 0, 0, NULL, NULL},
 134 };
 135
 136 #ifdef INET6
 137 #define PTON_MAX        16
 138 #else
 139 #define PTON_MAX        4
 140 #endif
 141
 142 static int get_name __P((const char *, const struct afd *,
 143                           struct addrinfo **, char *, struct addrinfo *,
 144                           int));
 145 static int get_addr __P((const char *, int, struct addrinfo **,
 146                         struct addrinfo *, int));
 147 static int str_isnumber __P((const char *));
 148
 149 static const char *const ai_errlist[] = {
 150         "success.",
 151         "address family for hostname not supported.",   /* EAI_ADDRFAMILY */
 152         "temporary failure in name resolution.",        /* EAI_AGAIN      */
 153         "invalid value for ai_flags.",                  /* EAI_BADFLAGS   */
 154         "non-recoverable failure in name resolution.",  /* EAI_FAIL       */
 155         "ai_family not supported.",                     /* EAI_FAMILY     */
 156         "memory allocation failure.",                   /* EAI_MEMORY     */
 157         "no address associated with hostname.",         /* EAI_NODATA     */
 158         "hostname nor servname provided, or not known.",/* EAI_NONAME     */
 159         "servname not supported for ai_socktype.",      /* EAI_SERVICE    */
 160         "ai_socktype not supported.",                   /* EAI_SOCKTYPE   */
 161         "system error returned in errno.",              /* EAI_SYSTEM     */
 162         "invalid value for hints.",                     /* EAI_BADHINTS   */
 163         "resolved protocol is unknown.",                /* EAI_PROTOCOL   */
 164         "unknown error.",                               /* EAI_MAX        */
 165 };
 166
 167 #define GET_CANONNAME(ai, str) \
 168 if (pai->ai_flags & AI_CANONNAME) {\
 169         if (((ai)->ai_canonname = (char *)malloc(strlen(str) + 1)) != NULL) {\
 170                 strcpy((ai)->ai_canonname, (str));\
 171         } else {\
 172                 error = EAI_MEMORY;\
 173                 goto free;\
 174         }\
 175 }
 176
 177 #define GET_AI(ai, afd, addr, port) {\
 178         char *p;\
 179         if (((ai) = (struct addrinfo *)malloc(sizeof(struct addrinfo) +\
 180                                               ((afd)->a_socklen)))\
 181             == NULL) {\
 182                 error = EAI_MEMORY;\
 183                 goto free;\
 184         }\
 185         memcpy(ai, pai, sizeof(struct addrinfo));\
 186         (ai)->ai_addr = (struct sockaddr *)((ai) + 1);\
 187         memset((ai)->ai_addr, 0, (afd)->a_socklen);\
 188         SET_SA_LEN((ai)->ai_addr, (ai)->ai_addrlen = (afd)->a_socklen);\
 189         (ai)->ai_addr->sa_family = (ai)->ai_family = (afd)->a_af;\
 190         ((struct sockinet *)(ai)->ai_addr)->si_port = port;\
 191         p = (char *)((ai)->ai_addr);\
 192         memcpy(p + (afd)->a_off, (addr), (afd)->a_addrlen);\
 193 }
 194
 195 #define ERR(err) { error = (err); goto bad; }
 196
 197 #ifndef __HAIKU__
 198 #if defined __UCLIBC__
 199 const
 200 #endif
 201 char *
 202 gai_strerror(int ecode)
 203 {
 204         if (ecode < 0 || ecode > EAI_MAX)
 205                 ecode = EAI_MAX;
 206         return (char *)ai_errlist[ecode];
 207 }
 208 #endif
 209
 210 void
 211 freeaddrinfo(struct addrinfo *ai)
 212 {
 213         struct addrinfo *next;
 214
 215         do {
 216                 next = ai->ai_next;
 217                 if (ai->ai_canonname)
 218                         free(ai->ai_canonname);
 219                 /* no need to free(ai->ai_addr) */
 220                 free(ai);
 221         } while ((ai = next) != NULL);
 222 }
 223
 224 static int
 225 str_isnumber(const char *p)
 226 {
 227         char *q = (char *)p;
 228         while (*q) {
 229                 if (! isdigit(*q))
 230                         return NO;
 231                 q++;
 232         }
 233         return YES;
 234 }
 235
 236 #ifndef HAVE_INET_PTON
 237
 238 static int
 239 inet_pton(int af, const char *hostname, void *pton)
 240 {
 241         struct in_addr in;
 242
 243 #ifdef HAVE_INET_ATON
 244         if (!inet_aton(hostname, &in))
 245             return 0;
 246 #else
 247         int d1, d2, d3, d4;
 248         char ch;
 249
 250         if (sscanf(hostname, "%d.%d.%d.%d%c", &d1, &d2, &d3, &d4, &ch) == 4 &&
 251             0 <= d1 && d1 <= 255 && 0 <= d2 && d2 <= 255 &&
 252             0 <= d3 && d3 <= 255 && 0 <= d4 && d4 <= 255) {
 253             in.s_addr = htonl(
 254                 ((long) d1 << 24) | ((long) d2 << 16) |
 255                 ((long) d3 << 8) | ((long) d4 << 0));
 256         }
 257         else {
 258             return 0;
 259         }
 260 #endif
 261         memcpy(pton, &in, sizeof(in));
 262         return 1;
 263 }
 264 #endif
 265
 266 int
 267 getaddrinfo(const char *hostname, const char *servname, const struct addrinfo *hints, struct addrinfo **res)
 268 {
 269         struct addrinfo sentinel;
 270         struct addrinfo *top = NULL;
 271         struct addrinfo *cur;
 272         int i, error = 0;
 273         char pton[PTON_MAX];
 274         struct addrinfo ai;
 275         struct addrinfo *pai;
 276         u_short port;
 277
 278 #ifdef FAITH
 279         static int firsttime = 1;
 280
 281         if (firsttime) {
 282                 /* translator hack */
 283                 {
 284                         char *q = getenv("GAI");
 285                         if (q && inet_pton(AF_INET6, q, &faith_prefix) == 1)
 286                                 translate = YES;
 287                 }
 288                 firsttime = 0;
 289         }
 290 #endif
 291
 292         /* initialize file static vars */
 293         sentinel.ai_next = NULL;
 294         cur = &sentinel;
 295         pai = &ai;
 296         pai->ai_flags = 0;
 297         pai->ai_family = PF_UNSPEC;
 298         pai->ai_socktype = ANY;
 299         pai->ai_protocol = ANY;
 300         pai->ai_addrlen = 0;
 301         pai->ai_canonname = NULL;
 302         pai->ai_addr = NULL;
 303         pai->ai_next = NULL;
 304         port = ANY;
 305
 306         if (hostname == NULL && servname == NULL)
 307                 return EAI_NONAME;
 308         if (hints) {
 309                 /* error check for hints */
 310                 if (hints->ai_addrlen || hints->ai_canonname ||
 311                     hints->ai_addr || hints->ai_next)
 312                         ERR(EAI_BADHINTS); /* xxx */
 313                 if (hints->ai_flags & ~AI_MASK)
 314                         ERR(EAI_BADFLAGS);
 315                 switch (hints->ai_family) {
 316                 case PF_UNSPEC:
 317                 case PF_INET:
 318 #ifdef INET6
 319                 case PF_INET6:
 320 #endif
 321                         break;
 322                 default:
 323                         ERR(EAI_FAMILY);
 324                 }
 325                 memcpy(pai, hints, sizeof(*pai));
 326                 switch (pai->ai_socktype) {
 327                 case ANY:
 328                         switch (pai->ai_protocol) {
 329                         case ANY:
 330                                 break;
 331                         case IPPROTO_UDP:
 332                                 pai->ai_socktype = SOCK_DGRAM;
 333                                 break;
 334                         case IPPROTO_TCP:
 335                                 pai->ai_socktype = SOCK_STREAM;
 336                                 break;
 337                         default:
 338 #if defined(SOCK_RAW)
 339                                 pai->ai_socktype = SOCK_RAW;
 340 #endif
 341                                 break;
 342                         }
 343                         break;
 344 #if defined(SOCK_RAW)
 345                 case SOCK_RAW:
 346                         break;
 347 #endif
 348                 case SOCK_DGRAM:
 349                         if (pai->ai_protocol != IPPROTO_UDP &&
 350                             pai->ai_protocol != ANY)
 351                                 ERR(EAI_BADHINTS);      /*xxx*/
 352                         pai->ai_protocol = IPPROTO_UDP;
 353                         break;
 354                 case SOCK_STREAM:
 355                         if (pai->ai_protocol != IPPROTO_TCP &&
 356                             pai->ai_protocol != ANY)
 357                                 ERR(EAI_BADHINTS);      /*xxx*/
 358                         pai->ai_protocol = IPPROTO_TCP;
 359                         break;
 360                 default:
 361                         ERR(EAI_SOCKTYPE);
 362                         break;
 363                 }
 364         }
 365
 366         /*
 367          * service port
 368          */
 369         if (servname) {
 370                 if (str_isnumber(servname)) {
 371                         if (pai->ai_socktype == ANY) {
 372                                 /* caller accept *ANY* socktype */
 373                                 pai->ai_socktype = SOCK_DGRAM;
 374                                 pai->ai_protocol = IPPROTO_UDP;
 375                         }
 376                         port = htons((unsigned short)atoi(servname));
 377                 } else {
 378                         struct servent *sp;
 379                         const char *proto;
 380
 381                         proto = NULL;
 382                         switch (pai->ai_socktype) {
 383                         case ANY:
 384                                 proto = NULL;
 385                                 break;
 386                         case SOCK_DGRAM:
 387                                 proto = "udp";
 388                                 break;
 389                         case SOCK_STREAM:
 390                                 proto = "tcp";
 391                                 break;
 392                         default:
 393                                 fprintf(stderr, "panic!\n");
 394                                 break;
 395                         }
 396                         if ((sp = getservbyname((char*)servname, proto)) == NULL)
 397                                 ERR(EAI_SERVICE);
 398                         port = sp->s_port;
 399                         if (pai->ai_socktype == ANY)
 400                                 if (strcmp(sp->s_proto, "udp") == 0) {
 401                                         pai->ai_socktype = SOCK_DGRAM;
 402                                         pai->ai_protocol = IPPROTO_UDP;
 403                                 } else if (strcmp(sp->s_proto, "tcp") == 0) {
 404                                         pai->ai_socktype = SOCK_STREAM;
 405                                         pai->ai_protocol = IPPROTO_TCP;
 406                                 } else
 407                                         ERR(EAI_PROTOCOL);      /*xxx*/
 408                 }
 409         }
 410
 411         /*
 412          * hostname == NULL.
 413          * passive socket -> anyaddr (0.0.0.0 or ::)
 414          * non-passive socket -> localhost (127.0.0.1 or ::1)
 415          */
 416         if (hostname == NULL) {
 417                 const struct afd *afd;
 418                 int s;
 419
 420                 for (afd = &afdl[0]; afd->a_af; afd++) {
 421                         if (!(pai->ai_family == PF_UNSPEC
 422                            || pai->ai_family == afd->a_af)) {
 423                                 continue;
 424                         }
 425
 426                         /*
 427                          * filter out AFs that are not supported by the kernel
 428                          * XXX errno?
 429                          */
 430                         s = socket(afd->a_af, SOCK_DGRAM, 0);
 431                         if (s < 0)
 432                                 continue;
 433 #if defined(__BEOS__)
 434                         closesocket(s);
 435 #else
 436                         close(s);
 437 #endif
 438
 439                         if (pai->ai_flags & AI_PASSIVE) {
 440                                 GET_AI(cur->ai_next, afd, afd->a_addrany, port);
 441                                 /* xxx meaningless?
 442                                  * GET_CANONNAME(cur->ai_next, "anyaddr");
 443                                  */
 444                         } else {
 445                                 GET_AI(cur->ai_next, afd, afd->a_loopback,
 446                                         port);
 447                                 /* xxx meaningless?
 448                                  * GET_CANONNAME(cur->ai_next, "localhost");
 449                                  */
 450                         }
 451                         cur = cur->ai_next;
 452                 }
 453                 top = sentinel.ai_next;
 454                 if (top)
 455                         goto good;
 456                 else
 457                         ERR(EAI_FAMILY);
 458         }
 459
 460         /* hostname as numeric name */
 461         for (i = 0; afdl[i].a_af; i++) {
 462                 if (inet_pton(afdl[i].a_af, hostname, pton)) {
 463                         u_long v4a;
 464 #ifdef INET6
 465                         u_char pfx;
 466 #endif
 467
 468                         switch (afdl[i].a_af) {
 469                         case AF_INET:
 470                                 v4a = ((struct in_addr *)pton)->s_addr;
 471                                 if (IN_MULTICAST(v4a) || IN_EXPERIMENTAL(v4a))
 472                                         pai->ai_flags &= ~AI_CANONNAME;
 473                                 v4a >>= IN_CLASSA_NSHIFT;
 474                                 if (v4a == 0 || v4a == IN_LOOPBACKNET)
 475                                         pai->ai_flags &= ~AI_CANONNAME;
 476                                 break;
 477 #ifdef INET6
 478                         case AF_INET6:
 479 #ifdef HAVE_ADDR8
 480                                 pfx = ((struct in6_addr *)pton)->s6_addr8[0];
 481 #else
 482                                 pfx = ((struct in6_addr *)pton)->s6_addr[0];
 483 #endif
 484                                 if (pfx == 0 || pfx == 0xfe || pfx == 0xff)
 485                                         pai->ai_flags &= ~AI_CANONNAME;
 486                                 break;
 487 #endif
 488                         }
 489
 490                         if (pai->ai_family == afdl[i].a_af ||
 491                             pai->ai_family == PF_UNSPEC) {
 492                                 if (! (pai->ai_flags & AI_CANONNAME)) {
 493                                         GET_AI(top, &afdl[i], pton, port);
 494                                         goto good;
 495                                 }
 496                                 /*
 497                                  * if AI_CANONNAME and if reverse lookup
 498                                  * fail, return ai anyway to pacify
 499                                  * calling application.
 500                                  *
 501                                  * XXX getaddrinfo() is a name->address
 502                                  * translation function, and it looks strange
 503                                  * that we do addr->name translation here.
 504                                  */
 505                                 get_name(pton, &afdl[i], &top, pton, pai, port);
 506                                 goto good;
 507                         } else
 508                                 ERR(EAI_FAMILY);        /*xxx*/
 509                 }
 510         }
 511
 512         if (pai->ai_flags & AI_NUMERICHOST)
 513                 ERR(EAI_NONAME);
 514
 515         /* hostname as alphabetical name */
 516         error = get_addr(hostname, pai->ai_family, &top, pai, port);
 517         if (error == 0) {
 518                 if (top) {
 519  good:
 520                         *res = top;
 521                         return SUCCESS;
 522                 } else
 523                         error = EAI_FAIL;
 524         }
 525  free:
 526         if (top)
 527                 freeaddrinfo(top);
 528  bad:
 529         *res = NULL;
 530         return error;
 531 }
 532
 533 static int
 534 get_name(const char *addr, const struct afd *afd, struct addrinfo **res, char *numaddr, struct addrinfo *pai, int port0)
 535 {
 536         u_short port = port0 & 0xffff;
 537         struct hostent *hp;
 538         struct addrinfo *cur;
 539         int error = 0;
 540 #ifdef INET6
 541         int h_error;
 542 #endif
 543
 544 #ifdef INET6
 545         hp = getipnodebyaddr(addr, afd->a_addrlen, afd->a_af, &h_error);
 546 #else
 547         hp = gethostbyaddr((char*)addr, afd->a_addrlen, AF_INET);
 548 #endif
 549         if (hp && hp->h_name && hp->h_name[0] && hp->h_addr_list[0]) {
 550                 GET_AI(cur, afd, hp->h_addr_list[0], port);
 551                 GET_CANONNAME(cur, hp->h_name);
 552         } else
 553                 GET_AI(cur, afd, numaddr, port);
 554
 555 #ifdef INET6
 556         if (hp)
 557                 freehostent(hp);
 558 #endif
 559         *res = cur;
 560         return SUCCESS;
 561  free:
 562         if (cur)
 563                 freeaddrinfo(cur);
 564 #ifdef INET6
 565         if (hp)
 566                 freehostent(hp);
 567 #endif
 568  /* bad: */
 569         *res = NULL;
 570         return error;
 571 }
 572
 573 static int
 574 get_addr(const char *hostname, int af, struct addrinfo **res, struct addrinfo *pai, int port0)
 575 {
 576         u_short port = port0 & 0xffff;
 577         struct addrinfo sentinel;
 578         struct hostent *hp;
 579         struct addrinfo *top, *cur;
 580         const struct afd *afd;
 581         int i, error = 0, h_error;
 582         char *ap;
 583
 584         top = NULL;
 585         sentinel.ai_next = NULL;
 586         cur = &sentinel;
 587 #ifdef INET6
 588         if (af == AF_UNSPEC) {
 589                 hp = getipnodebyname(hostname, AF_INET6,
 590                                 AI_ADDRCONFIG|AI_ALL|AI_V4MAPPED, &h_error);
 591         } else
 592                 hp = getipnodebyname(hostname, af, AI_ADDRCONFIG, &h_error);
 593 #else
 594         hp = gethostbyname((char*)hostname);
 595         h_error = h_errno;
 596 #endif
 597         if (hp == NULL) {
 598                 switch (h_error) {
 599                 case HOST_NOT_FOUND:
 600                 case NO_DATA:
 601                         error = EAI_NODATA;
 602                         break;
 603                 case TRY_AGAIN:
 604                         error = EAI_AGAIN;
 605                         break;
 606                 case NO_RECOVERY:
 607                 default:
 608                         error = EAI_FAIL;
 609                         break;
 610                 }
 611                 goto bad;
 612         }
 613
 614         if ((hp->h_name == NULL) || (hp->h_name[0] == 0) ||
 615             (hp->h_addr_list[0] == NULL))
 616                 ERR(EAI_FAIL);
 617
 618         for (i = 0; (ap = hp->h_addr_list[i]) != NULL; i++) {
 619                 switch (af) {
 620 #ifdef INET6
 621                 case AF_INET6:
 622                         afd = &afdl[N_INET6];
 623                         break;
 624 #endif
 625 #ifndef INET6
 626                 default:        /* AF_UNSPEC */
 627 #endif
 628                 case AF_INET:
 629                         afd = &afdl[N_INET];
 630                         break;
 631 #ifdef INET6
 632                 default:        /* AF_UNSPEC */
 633                         if (IN6_IS_ADDR_V4MAPPED((struct in6_addr *)ap)) {
 634                                 ap += sizeof(struct in6_addr) -
 635                                         sizeof(struct in_addr);
 636                                 afd = &afdl[N_INET];
 637                         } else
 638                                 afd = &afdl[N_INET6];
 639                         break;
 640 #endif
 641                 }
 642 #ifdef FAITH
 643                 if (translate && afd->a_af == AF_INET) {
 644                         struct in6_addr *in6;
 645
 646                         GET_AI(cur->ai_next, &afdl[N_INET6], ap, port);
 647                         in6 = &((struct sockaddr_in6 *)cur->ai_next->ai_addr)->sin6_addr;
 648                         memcpy(&in6->s6_addr32[0], &faith_prefix,
 649                             sizeof(struct in6_addr) - sizeof(struct in_addr));
 650                         memcpy(&in6->s6_addr32[3], ap, sizeof(struct in_addr));
 651                 } else
 652 #endif /* FAITH */
 653                 GET_AI(cur->ai_next, afd, ap, port);
 654                 if (cur == &sentinel) {
 655                         top = cur->ai_next;
 656                         GET_CANONNAME(top, hp->h_name);
 657                 }
 658                 cur = cur->ai_next;
 659         }
 660 #ifdef INET6
 661         freehostent(hp);
 662 #endif
 663         *res = top;
 664         return SUCCESS;
 665  free:
 666         if (top)
 667                 freeaddrinfo(top);
 668 #ifdef INET6
 669         if (hp)
 670                 freehostent(hp);
 671 #endif
 672  bad:
 673         *res = NULL;
 674         return error;
 675 }