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ext/socket/getaddrinfo.c

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00001 /*
00002  * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
00003  * All rights reserved.
00004  *
00005  * Redistribution and use in source and binary forms, with or without
00006  * modification, are permitted provided that the following conditions
00007  * are met:
00008  * 1. Redistributions of source code must retain the above copyright
00009  *    notice, this list of conditions and the following disclaimer.
00010  * 2. Redistributions in binary form must reproduce the above copyright
00011  *    notice, this list of conditions and the following disclaimer in the
00012  *    documentation and/or other materials provided with the distribution.
00013  * 3. Neither the name of the project nor the names of its contributors
00014  *    may be used to endorse or promote products derived from this software
00015  *    without specific prior written permission.
00016  *
00017  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
00018  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
00019  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
00020  * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
00021  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
00022  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
00023  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
00024  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
00025  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
00026  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
00027  * SUCH DAMAGE.
00028  */
00029 
00030 /*
00031  * "#ifdef FAITH" part is local hack for supporting IPv4-v6 translator.
00032  *
00033  * Issues to be discussed:
00034  * - Thread safe-ness must be checked.
00035  * - Return values.  There are nonstandard return values defined and used
00036  *   in the source code.  This is because RFC2133 is silent about which error
00037  *   code must be returned for which situation.
00038  * - PF_UNSPEC case would be handled in getipnodebyname() with the AI_ALL flag.
00039  */
00040 
00041 #include "ruby/config.h"
00042 #ifdef RUBY_EXTCONF_H
00043 #include RUBY_EXTCONF_H
00044 #endif
00045 #include <sys/types.h>
00046 #ifndef _WIN32
00047 #include <sys/param.h>
00048 #if defined(__BEOS__) && !defined(__HAIKU__) && !defined(BONE)
00049 # include <net/socket.h>
00050 #else
00051 # include <sys/socket.h>
00052 #endif
00053 #include <netinet/in.h>
00054 #if defined(HAVE_ARPA_INET_H)
00055 #include <arpa/inet.h>
00056 #endif
00057 #if defined(HAVE_ARPA_NAMESER_H)
00058 #include <arpa/nameser.h>
00059 #endif
00060 #include <netdb.h>
00061 #if defined(HAVE_RESOLV_H)
00062 #ifdef _SX
00063 #include <stdio.h>
00064 #endif
00065 #include <resolv.h>
00066 #endif
00067 #include <unistd.h>
00068 #else
00069 #include <winsock2.h>
00070 #include <ws2tcpip.h>
00071 #include <io.h>
00072 #endif
00073 #include <string.h>
00074 #include <stdio.h>
00075 #include <stdlib.h>
00076 #include <stddef.h>
00077 #include <ctype.h>
00078 
00079 #ifdef SOCKS5
00080 #include <socks.h>
00081 #endif
00082 
00083 #include "addrinfo.h"
00084 #include "sockport.h"
00085 
00086 #define SUCCESS 0
00087 #define ANY 0
00088 #define YES 1
00089 #define NO  0
00090 
00091 #ifdef FAITH
00092 static int translate = NO;
00093 static struct in6_addr faith_prefix = IN6ADDR_ANY_INIT;
00094 #endif
00095 
00096 static const char in_addrany[] = { 0, 0, 0, 0 };
00097 static const char in6_addrany[] = {
00098         0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
00099 };
00100 static const char in_loopback[] = { 127, 0, 0, 1 };
00101 static const char in6_loopback[] = {
00102         0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1
00103 };
00104 
00105 struct sockinet {
00106         u_char  si_len;
00107         u_char  si_family;
00108         u_short si_port;
00109 };
00110 
00111 static const struct afd {
00112         int a_af;
00113         int a_addrlen;
00114         int a_socklen;
00115         int a_off;
00116         const char *a_addrany;
00117         const char *a_loopback;
00118 } afdl [] = {
00119 #ifdef INET6
00120 #define N_INET6 0
00121         {PF_INET6, sizeof(struct in6_addr),
00122          sizeof(struct sockaddr_in6),
00123          offsetof(struct sockaddr_in6, sin6_addr),
00124          in6_addrany, in6_loopback},
00125 #define N_INET  1
00126 #else
00127 #define N_INET  0
00128 #endif
00129         {PF_INET, sizeof(struct in_addr),
00130          sizeof(struct sockaddr_in),
00131          offsetof(struct sockaddr_in, sin_addr),
00132          in_addrany, in_loopback},
00133         {0, 0, 0, 0, NULL, NULL},
00134 };
00135 
00136 #ifdef INET6
00137 #define PTON_MAX        16
00138 #else
00139 #define PTON_MAX        4
00140 #endif
00141 
00142 static int get_name __P((const char *, const struct afd *,
00143                           struct addrinfo **, char *, struct addrinfo *,
00144                           int));
00145 static int get_addr __P((const char *, int, struct addrinfo **,
00146                         struct addrinfo *, int));
00147 static int str_isnumber __P((const char *));
00148 
00149 static const char *const ai_errlist[] = {
00150         "success.",
00151         "address family for hostname not supported.",   /* EAI_ADDRFAMILY */
00152         "temporary failure in name resolution.",        /* EAI_AGAIN      */
00153         "invalid value for ai_flags.",                  /* EAI_BADFLAGS   */
00154         "non-recoverable failure in name resolution.",  /* EAI_FAIL       */
00155         "ai_family not supported.",                     /* EAI_FAMILY     */
00156         "memory allocation failure.",                   /* EAI_MEMORY     */
00157         "no address associated with hostname.",         /* EAI_NODATA     */
00158         "hostname nor servname provided, or not known.",/* EAI_NONAME     */
00159         "servname not supported for ai_socktype.",      /* EAI_SERVICE    */
00160         "ai_socktype not supported.",                   /* EAI_SOCKTYPE   */
00161         "system error returned in errno.",              /* EAI_SYSTEM     */
00162         "invalid value for hints.",                     /* EAI_BADHINTS   */
00163         "resolved protocol is unknown.",                /* EAI_PROTOCOL   */
00164         "unknown error.",                               /* EAI_MAX        */
00165 };
00166 
00167 #define GET_CANONNAME(ai, str) \
00168 if (pai->ai_flags & AI_CANONNAME) {\
00169         if (((ai)->ai_canonname = (char *)malloc(strlen(str) + 1)) != NULL) {\
00170                 strcpy((ai)->ai_canonname, (str));\
00171         } else {\
00172                 error = EAI_MEMORY;\
00173                 goto free;\
00174         }\
00175 }
00176 
00177 #define GET_AI(ai, afd, addr, port) {\
00178         char *p;\
00179         if (((ai) = (struct addrinfo *)malloc(sizeof(struct addrinfo) +\
00180                                               ((afd)->a_socklen)))\
00181             == NULL) {\
00182                 error = EAI_MEMORY;\
00183                 goto free;\
00184         }\
00185         memcpy(ai, pai, sizeof(struct addrinfo));\
00186         (ai)->ai_addr = (struct sockaddr *)((ai) + 1);\
00187         memset((ai)->ai_addr, 0, (afd)->a_socklen);\
00188         SET_SA_LEN((ai)->ai_addr, (ai)->ai_addrlen = (afd)->a_socklen);\
00189         (ai)->ai_addr->sa_family = (ai)->ai_family = (afd)->a_af;\
00190         ((struct sockinet *)(ai)->ai_addr)->si_port = port;\
00191         p = (char *)((ai)->ai_addr);\
00192         memcpy(p + (afd)->a_off, (addr), (afd)->a_addrlen);\
00193 }
00194 
00195 #define ERR(err) { error = (err); goto bad; }
00196 
00197 #ifndef HAVE_GAI_STRERROR
00198 #ifdef GAI_STRERROR_CONST
00199 const
00200 #endif
00201 char *
00202 gai_strerror(int ecode)
00203 {
00204         if (ecode < 0 || ecode > EAI_MAX)
00205                 ecode = EAI_MAX;
00206         return (char *)ai_errlist[ecode];
00207 }
00208 #endif
00209 
00210 void
00211 freeaddrinfo(struct addrinfo *ai)
00212 {
00213         struct addrinfo *next;
00214 
00215         do {
00216                 next = ai->ai_next;
00217                 if (ai->ai_canonname)
00218                         free(ai->ai_canonname);
00219                 /* no need to free(ai->ai_addr) */
00220                 free(ai);
00221         } while ((ai = next) != NULL);
00222 }
00223 
00224 static int
00225 str_isnumber(const char *p)
00226 {
00227         char *q = (char *)p;
00228         while (*q) {
00229                 if (! isdigit(*q))
00230                         return NO;
00231                 q++;
00232         }
00233         return YES;
00234 }
00235 
00236 #ifndef HAVE_INET_PTON
00237 
00238 static int
00239 inet_pton(int af, const char *hostname, void *pton)
00240 {
00241         struct in_addr in;
00242 
00243 #ifdef HAVE_INET_ATON
00244         if (!inet_aton(hostname, &in))
00245             return 0;
00246 #else
00247         int d1, d2, d3, d4;
00248         char ch;
00249 
00250         if (sscanf(hostname, "%d.%d.%d.%d%c", &d1, &d2, &d3, &d4, &ch) == 4 &&
00251             0 <= d1 && d1 <= 255 && 0 <= d2 && d2 <= 255 &&
00252             0 <= d3 && d3 <= 255 && 0 <= d4 && d4 <= 255) {
00253             in.s_addr = htonl(
00254                 ((long) d1 << 24) | ((long) d2 << 16) |
00255                 ((long) d3 << 8) | ((long) d4 << 0));
00256         }
00257         else {
00258             return 0;
00259         }
00260 #endif
00261         memcpy(pton, &in, sizeof(in));
00262         return 1;
00263 }
00264 #endif
00265 
00266 int
00267 getaddrinfo(const char *hostname, const char *servname, const struct addrinfo *hints, struct addrinfo **res)
00268 {
00269         struct addrinfo sentinel;
00270         struct addrinfo *top = NULL;
00271         struct addrinfo *cur;
00272         int i, error = 0;
00273         char pton[PTON_MAX];
00274         struct addrinfo ai;
00275         struct addrinfo *pai;
00276         u_short port;
00277 
00278 #ifdef FAITH
00279         static int firsttime = 1;
00280 
00281         if (firsttime) {
00282                 /* translator hack */
00283                 {
00284                         char *q = getenv("GAI");
00285                         if (q && inet_pton(AF_INET6, q, &faith_prefix) == 1)
00286                                 translate = YES;
00287                 }
00288                 firsttime = 0;
00289         }
00290 #endif
00291 
00292         /* initialize file static vars */
00293         sentinel.ai_next = NULL;
00294         cur = &sentinel;
00295         pai = &ai;
00296         pai->ai_flags = 0;
00297         pai->ai_family = PF_UNSPEC;
00298         pai->ai_socktype = ANY;
00299         pai->ai_protocol = ANY;
00300         pai->ai_addrlen = 0;
00301         pai->ai_canonname = NULL;
00302         pai->ai_addr = NULL;
00303         pai->ai_next = NULL;
00304         port = ANY;
00305 
00306         if (hostname == NULL && servname == NULL)
00307                 return EAI_NONAME;
00308         if (hints) {
00309                 /* error check for hints */
00310                 if (hints->ai_addrlen || hints->ai_canonname ||
00311                     hints->ai_addr || hints->ai_next)
00312                         ERR(EAI_BADHINTS); /* xxx */
00313                 if (hints->ai_flags & ~AI_MASK)
00314                         ERR(EAI_BADFLAGS);
00315                 switch (hints->ai_family) {
00316                 case PF_UNSPEC:
00317                 case PF_INET:
00318 #ifdef INET6
00319                 case PF_INET6:
00320 #endif
00321                         break;
00322                 default:
00323                         ERR(EAI_FAMILY);
00324                 }
00325                 memcpy(pai, hints, sizeof(*pai));
00326                 switch (pai->ai_socktype) {
00327                 case ANY:
00328                         switch (pai->ai_protocol) {
00329                         case ANY:
00330                                 break;
00331                         case IPPROTO_UDP:
00332                                 pai->ai_socktype = SOCK_DGRAM;
00333                                 break;
00334                         case IPPROTO_TCP:
00335                                 pai->ai_socktype = SOCK_STREAM;
00336                                 break;
00337                         default:
00338 #if defined(SOCK_RAW)
00339                                 pai->ai_socktype = SOCK_RAW;
00340 #endif
00341                                 break;
00342                         }
00343                         break;
00344 #if defined(SOCK_RAW)
00345                 case SOCK_RAW:
00346                         break;
00347 #endif
00348                 case SOCK_DGRAM:
00349                         if (pai->ai_protocol != IPPROTO_UDP &&
00350                             pai->ai_protocol != ANY)
00351                                 ERR(EAI_BADHINTS);      /*xxx*/
00352                         pai->ai_protocol = IPPROTO_UDP;
00353                         break;
00354                 case SOCK_STREAM:
00355                         if (pai->ai_protocol != IPPROTO_TCP &&
00356                             pai->ai_protocol != ANY)
00357                                 ERR(EAI_BADHINTS);      /*xxx*/
00358                         pai->ai_protocol = IPPROTO_TCP;
00359                         break;
00360                 default:
00361                         ERR(EAI_SOCKTYPE);
00362                         break;
00363                 }
00364         }
00365 
00366         /*
00367          * service port
00368          */
00369         if (servname) {
00370                 if (str_isnumber(servname)) {
00371                         if (pai->ai_socktype == ANY) {
00372                                 /* caller accept *ANY* socktype */
00373                                 pai->ai_socktype = SOCK_DGRAM;
00374                                 pai->ai_protocol = IPPROTO_UDP;
00375                         }
00376                         port = htons((unsigned short)atoi(servname));
00377                 } else if (pai->ai_flags & AI_NUMERICSERV) {
00378                         ERR(EAI_NONAME);
00379                 } else {
00380                         struct servent *sp;
00381                         const char *proto;
00382 
00383                         proto = NULL;
00384                         switch (pai->ai_socktype) {
00385                         case ANY:
00386                                 proto = NULL;
00387                                 break;
00388                         case SOCK_DGRAM:
00389                                 proto = "udp";
00390                                 break;
00391                         case SOCK_STREAM:
00392                                 proto = "tcp";
00393                                 break;
00394                         default:
00395                                 fprintf(stderr, "panic!\n");
00396                                 break;
00397                         }
00398                         if ((sp = getservbyname((char*)servname, proto)) == NULL)
00399                                 ERR(EAI_SERVICE);
00400                         port = sp->s_port;
00401                         if (pai->ai_socktype == ANY)
00402                                 if (strcmp(sp->s_proto, "udp") == 0) {
00403                                         pai->ai_socktype = SOCK_DGRAM;
00404                                         pai->ai_protocol = IPPROTO_UDP;
00405                                 } else if (strcmp(sp->s_proto, "tcp") == 0) {
00406                                         pai->ai_socktype = SOCK_STREAM;
00407                                         pai->ai_protocol = IPPROTO_TCP;
00408                                 } else
00409                                         ERR(EAI_PROTOCOL);      /*xxx*/
00410                 }
00411         }
00412 
00413         /*
00414          * hostname == NULL.
00415          * passive socket -> anyaddr (0.0.0.0 or ::)
00416          * non-passive socket -> localhost (127.0.0.1 or ::1)
00417          */
00418         if (hostname == NULL) {
00419                 const struct afd *afd;
00420                 int s;
00421 
00422                 for (afd = &afdl[0]; afd->a_af; afd++) {
00423                         if (!(pai->ai_family == PF_UNSPEC
00424                            || pai->ai_family == afd->a_af)) {
00425                                 continue;
00426                         }
00427 
00428                         /*
00429                          * filter out AFs that are not supported by the kernel
00430                          * XXX errno?
00431                          */
00432                         s = socket(afd->a_af, SOCK_DGRAM, 0);
00433                         if (s < 0)
00434                                 continue;
00435 #if defined(__BEOS__)
00436                         closesocket(s);
00437 #else
00438                         close(s);
00439 #endif
00440 
00441                         if (pai->ai_flags & AI_PASSIVE) {
00442                                 GET_AI(cur->ai_next, afd, afd->a_addrany, port);
00443                                 /* xxx meaningless?
00444                                  * GET_CANONNAME(cur->ai_next, "anyaddr");
00445                                  */
00446                         } else {
00447                                 GET_AI(cur->ai_next, afd, afd->a_loopback,
00448                                         port);
00449                                 /* xxx meaningless?
00450                                  * GET_CANONNAME(cur->ai_next, "localhost");
00451                                  */
00452                         }
00453                         cur = cur->ai_next;
00454                 }
00455                 top = sentinel.ai_next;
00456                 if (top)
00457                         goto good;
00458                 else
00459                         ERR(EAI_FAMILY);
00460         }
00461 
00462         /* hostname as numeric name */
00463         for (i = 0; afdl[i].a_af; i++) {
00464                 if (inet_pton(afdl[i].a_af, hostname, pton)) {
00465                         u_long v4a;
00466 #ifdef INET6
00467                         u_char pfx;
00468 #endif
00469 
00470                         switch (afdl[i].a_af) {
00471                         case AF_INET:
00472                                 v4a = ((struct in_addr *)pton)->s_addr;
00473                                 if (IN_MULTICAST(v4a) || IN_EXPERIMENTAL(v4a))
00474                                         pai->ai_flags &= ~AI_CANONNAME;
00475                                 v4a >>= IN_CLASSA_NSHIFT;
00476                                 if (v4a == 0 || v4a == IN_LOOPBACKNET)
00477                                         pai->ai_flags &= ~AI_CANONNAME;
00478                                 break;
00479 #ifdef INET6
00480                         case AF_INET6:
00481                                 pfx = ((struct in6_addr *)pton)->s6_addr[0];
00482                                 if (pfx == 0 || pfx == 0xfe || pfx == 0xff)
00483                                         pai->ai_flags &= ~AI_CANONNAME;
00484                                 break;
00485 #endif
00486                         }
00487 
00488                         if (pai->ai_family == afdl[i].a_af ||
00489                             pai->ai_family == PF_UNSPEC) {
00490                                 if (! (pai->ai_flags & AI_CANONNAME)) {
00491                                         GET_AI(top, &afdl[i], pton, port);
00492                                         goto good;
00493                                 }
00494                                 /*
00495                                  * if AI_CANONNAME and if reverse lookup
00496                                  * fail, return ai anyway to pacify
00497                                  * calling application.
00498                                  *
00499                                  * XXX getaddrinfo() is a name->address
00500                                  * translation function, and it looks strange
00501                                  * that we do addr->name translation here.
00502                                  */
00503                                 get_name(pton, &afdl[i], &top, pton, pai, port);
00504                                 goto good;
00505                         } else
00506                                 ERR(EAI_FAMILY);        /*xxx*/
00507                 }
00508         }
00509 
00510         if (pai->ai_flags & AI_NUMERICHOST)
00511                 ERR(EAI_NONAME);
00512 
00513         /* hostname as alphabetical name */
00514         error = get_addr(hostname, pai->ai_family, &top, pai, port);
00515         if (error == 0) {
00516                 if (top) {
00517  good:
00518                         *res = top;
00519                         return SUCCESS;
00520                 } else
00521                         error = EAI_FAIL;
00522         }
00523  free:
00524         if (top)
00525                 freeaddrinfo(top);
00526  bad:
00527         *res = NULL;
00528         return error;
00529 }
00530 
00531 static int
00532 get_name(const char *addr, const struct afd *afd, struct addrinfo **res, char *numaddr, struct addrinfo *pai, int port0)
00533 {
00534         u_short port = port0 & 0xffff;
00535         struct hostent *hp;
00536         struct addrinfo *cur;
00537         int error = 0;
00538 #ifdef INET6
00539         int h_error;
00540 #endif
00541 
00542 #ifdef INET6
00543         hp = getipnodebyaddr(addr, afd->a_addrlen, afd->a_af, &h_error);
00544 #else
00545         hp = gethostbyaddr((char*)addr, afd->a_addrlen, AF_INET);
00546 #endif
00547         if (hp && hp->h_name && hp->h_name[0] && hp->h_addr_list[0]) {
00548                 GET_AI(cur, afd, hp->h_addr_list[0], port);
00549                 GET_CANONNAME(cur, hp->h_name);
00550         } else
00551                 GET_AI(cur, afd, numaddr, port);
00552 
00553 #ifdef INET6
00554         if (hp)
00555                 freehostent(hp);
00556 #endif
00557         *res = cur;
00558         return SUCCESS;
00559  free:
00560         if (cur)
00561                 freeaddrinfo(cur);
00562 #ifdef INET6
00563         if (hp)
00564                 freehostent(hp);
00565 #endif
00566  /* bad: */
00567         *res = NULL;
00568         return error;
00569 }
00570 
00571 static int
00572 get_addr(const char *hostname, int af, struct addrinfo **res, struct addrinfo *pai, int port0)
00573 {
00574         u_short port = port0 & 0xffff;
00575         struct addrinfo sentinel;
00576         struct hostent *hp;
00577         struct addrinfo *top, *cur;
00578         const struct afd *afd;
00579         int i, error = 0, h_error;
00580         char *ap;
00581 
00582         top = NULL;
00583         sentinel.ai_next = NULL;
00584         cur = &sentinel;
00585 #ifdef INET6
00586         if (af == AF_UNSPEC) {
00587                 hp = getipnodebyname(hostname, AF_INET6,
00588                                 AI_ADDRCONFIG|AI_ALL|AI_V4MAPPED, &h_error);
00589         } else
00590                 hp = getipnodebyname(hostname, af, AI_ADDRCONFIG, &h_error);
00591 #else
00592         hp = gethostbyname((char*)hostname);
00593         h_error = h_errno;
00594 #endif
00595         if (hp == NULL) {
00596                 switch (h_error) {
00597                 case HOST_NOT_FOUND:
00598                 case NO_DATA:
00599                         error = EAI_NODATA;
00600                         break;
00601                 case TRY_AGAIN:
00602                         error = EAI_AGAIN;
00603                         break;
00604                 case NO_RECOVERY:
00605                 default:
00606                         error = EAI_FAIL;
00607                         break;
00608                 }
00609                 goto bad;
00610         }
00611 
00612         if ((hp->h_name == NULL) || (hp->h_name[0] == 0) ||
00613             (hp->h_addr_list[0] == NULL))
00614                 ERR(EAI_FAIL);
00615 
00616         for (i = 0; (ap = hp->h_addr_list[i]) != NULL; i++) {
00617                 switch (af) {
00618 #ifdef INET6
00619                 case AF_INET6:
00620                         afd = &afdl[N_INET6];
00621                         break;
00622 #endif
00623 #ifndef INET6
00624                 default:        /* AF_UNSPEC */
00625 #endif
00626                 case AF_INET:
00627                         afd = &afdl[N_INET];
00628                         break;
00629 #ifdef INET6
00630                 default:        /* AF_UNSPEC */
00631                         if (IN6_IS_ADDR_V4MAPPED((struct in6_addr *)ap)) {
00632                                 ap += sizeof(struct in6_addr) -
00633                                         sizeof(struct in_addr);
00634                                 afd = &afdl[N_INET];
00635                         } else
00636                                 afd = &afdl[N_INET6];
00637                         break;
00638 #endif
00639                 }
00640 #ifdef FAITH
00641                 if (translate && afd->a_af == AF_INET) {
00642                         struct in6_addr *in6;
00643 
00644                         GET_AI(cur->ai_next, &afdl[N_INET6], ap, port);
00645                         in6 = &((struct sockaddr_in6 *)cur->ai_next->ai_addr)->sin6_addr;
00646                         memcpy(&in6->s6_addr, &faith_prefix,
00647                                sizeof(struct in6_addr) - sizeof(struct in_addr));
00648                         memcpy(&in6->s6_addr + sizeof(struct in_addr), ap,
00649                                sizeof(struct in_addr));
00650                 } else
00651 #endif /* FAITH */
00652                 GET_AI(cur->ai_next, afd, ap, port);
00653                 if (cur == &sentinel) {
00654                         top = cur->ai_next;
00655                         GET_CANONNAME(top, hp->h_name);
00656                 }
00657                 cur = cur->ai_next;
00658         }
00659 #ifdef INET6
00660         freehostent(hp);
00661 #endif
00662         *res = top;
00663         return SUCCESS;
00664  free:
00665         if (top)
00666                 freeaddrinfo(top);
00667 #ifdef INET6
00668         if (hp)
00669                 freehostent(hp);
00670 #endif
00671  bad:
00672         *res = NULL;
00673         return error;
00674 }
00675 

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