external/bsd/libpcap/dist/Win32/Src/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 RFC2553 is silent about which error
  37  *   code must be returned for which situation.
  38  * Note:
  39  * - We use getipnodebyname() just for thread-safeness.  There's no intent
  40  *   to let it do PF_UNSPEC (actually we never pass PF_UNSPEC to
  41  *   getipnodebyname().
  42  * - The code filters out AFs that are not supported by the kernel,
  43  *   when globbing NULL hostname (to loopback, or wildcard).  Is it the right
  44  *   thing to do?  What is the relationship with post-RFC2553 AI_ADDRCONFIG
  45  *   in ai_flags?
  46  */
  47
  48 /*
  49  * Mingw64 has its own implementation of getaddrinfo, mingw32 no
  50  */
  51 #ifndef __MINGW64__
  52
  53
  54 #ifdef HAVE_CONFIG_H
  55 #include <config.h>
  56 #endif
  57
  58 #include <pcap-stdinc.h>
  59 #if 0
  60 #include <sys/sysctl.h>
  61 #endif
  62 #ifndef __MINGW32__
  63 #include <arpa/nameser.h>
  64 #endif
  65 #include <string.h>
  66 #include <stdlib.h>
  67 #include <stddef.h>
  68 #include <ctype.h>
  69 #include <stdio.h>
  70 #include <errno.h>
  71
  72 #ifndef HAVE_PORTABLE_PROTOTYPE
  73 #include "cdecl_ext.h"
  74 #endif
  75
  76 #ifndef HAVE_U_INT32_T
  77 #include "bittypes.h"
  78 #endif
  79
  80 #ifndef HAVE_SOCKADDR_STORAGE
  81 #ifndef __MINGW32__
  82 #include "sockstorage.h"
  83 #endif
  84 #endif
  85
  86 #ifdef NEED_ADDRINFO_H
  87 #include "addrinfo.h"
  88 #ifdef WIN32
  89 #include "ip6_misc.h"
  90 #endif
  91 #endif
  92
  93
  94 #if defined(__KAME__) && defined(INET6)
  95 # define FAITH
  96 #endif
  97
  98 #define SUCCESS 0
  99 #define ANY 0
 100 #define YES 1
 101 #define NO  0
 102
 103 #ifdef FAITH
 104 static int translate = NO;
 105 static struct in6_addr faith_prefix = IN6ADDR_ANY_INIT;
 106 #endif
 107
 108 static const char in_addrany[] = { 0, 0, 0, 0 };
 109 static const char in6_addrany[] = {
 110         0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
 111 };
 112 static const char in_loopback[] = { 127, 0, 0, 1 };
 113 static const char in6_loopback[] = {
 114         0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1
 115 };
 116
 117 struct sockinet {
 118         u_char  si_len;
 119         u_char  si_family;
 120         u_short si_port;
 121         u_int32_t si_scope_id;
 122 };
 123
 124 static const struct afd {
 125         int a_af;
 126         int a_addrlen;
 127         int a_socklen;
 128         int a_off;
 129         const char *a_addrany;
 130         const char *a_loopback;
 131         int a_scoped;
 132 } afdl [] = {
 133 #ifdef INET6
 134         {PF_INET6, sizeof(struct in6_addr),
 135          sizeof(struct sockaddr_in6),
 136          offsetof(struct sockaddr_in6, sin6_addr),
 137          in6_addrany, in6_loopback, 1},
 138 #endif
 139         {PF_INET, sizeof(struct in_addr),
 140          sizeof(struct sockaddr_in),
 141          offsetof(struct sockaddr_in, sin_addr),
 142          in_addrany, in_loopback, 0},
 143         {0, 0, 0, 0, NULL, NULL, 0},
 144 };
 145
 146 struct explore {
 147         int e_af;
 148         int e_socktype;
 149         int e_protocol;
 150         const char *e_protostr;
 151         int e_wild;
 152 #define WILD_AF(ex)             ((ex)->e_wild & 0x01)
 153 #define WILD_SOCKTYPE(ex)       ((ex)->e_wild & 0x02)
 154 #define WILD_PROTOCOL(ex)       ((ex)->e_wild & 0x04)
 155 };
 156
 157 static const struct explore explore[] = {
 158 #if 0
 159         { PF_LOCAL, 0, ANY, ANY, NULL, 0x01 },
 160 #endif
 161 #ifdef INET6
 162         { PF_INET6, SOCK_DGRAM, IPPROTO_UDP, "udp", 0x07 },
 163         { PF_INET6, SOCK_STREAM, IPPROTO_TCP, "tcp", 0x07 },
 164         { PF_INET6, SOCK_RAW, ANY, NULL, 0x05 },
 165 #endif
 166         { PF_INET, SOCK_DGRAM, IPPROTO_UDP, "udp", 0x07 },
 167         { PF_INET, SOCK_STREAM, IPPROTO_TCP, "tcp", 0x07 },
 168         { PF_INET, SOCK_RAW, ANY, NULL, 0x05 },
 169         { -1, 0, 0, NULL, 0 },
 170 };
 171
 172 #ifdef INET6
 173 #define PTON_MAX        16
 174 #else
 175 #define PTON_MAX        4
 176 #endif
 177
 178
 179 static int str_isnumber __P((const char *));
 180 static int explore_fqdn __P((const struct addrinfo *, const char *,
 181         const char *, struct addrinfo **));
 182 static int explore_null __P((const struct addrinfo *, const char *,
 183         const char *, struct addrinfo **));
 184 static int explore_numeric __P((const struct addrinfo *, const char *,
 185         const char *, struct addrinfo **));
 186 static int explore_numeric_scope __P((const struct addrinfo *, const char *,
 187         const char *, struct addrinfo **));
 188 static int get_name __P((const char *, const struct afd *, struct addrinfo **,
 189         char *, const struct addrinfo *, const char *));
 190 static int get_canonname __P((const struct addrinfo *,
 191         struct addrinfo *, const char *));
 192 static struct addrinfo *get_ai __P((const struct addrinfo *,
 193         const struct afd *, const char *));
 194 static int get_portmatch __P((const struct addrinfo *, const char *));
 195 static int get_port __P((struct addrinfo *, const char *, int));
 196 static const struct afd *find_afd __P((int));
 197
 198 static char *ai_errlist[] = {
 199         "Success",
 200         "Address family for hostname not supported",    /* EAI_ADDRFAMILY */
 201         "Temporary failure in name resolution",         /* EAI_AGAIN      */
 202         "Invalid value for ai_flags",                   /* EAI_BADFLAGS   */
 203         "Non-recoverable failure in name resolution",   /* EAI_FAIL       */
 204         "ai_family not supported",                      /* EAI_FAMILY     */
 205         "Memory allocation failure",                    /* EAI_MEMORY     */
 206         "No address associated with hostname",          /* EAI_NODATA     */
 207         "hostname nor servname provided, or not known", /* EAI_NONAME     */
 208         "servname not supported for ai_socktype",       /* EAI_SERVICE    */
 209         "ai_socktype not supported",                    /* EAI_SOCKTYPE   */
 210         "System error returned in errno",               /* EAI_SYSTEM     */
 211         "Invalid value for hints",                      /* EAI_BADHINTS   */
 212         "Resolved protocol is unknown",                 /* EAI_PROTOCOL   */
 213         "Unknown error",                                /* EAI_MAX        */
 214 };
 215
 216 /* XXX macros that make external reference is BAD. */
 217
 218 #define GET_AI(ai, afd, addr) \
 219 do { \
 220         /* external reference: pai, error, and label free */ \
 221         (ai) = get_ai(pai, (afd), (addr)); \
 222         if ((ai) == NULL) { \
 223                 error = EAI_MEMORY; \
 224                 goto free; \
 225         } \
 226 } while (0)
 227
 228 #define GET_PORT(ai, serv) \
 229 do { \
 230         /* external reference: error and label free */ \
 231         error = get_port((ai), (serv), 0); \
 232         if (error != 0) \
 233                 goto free; \
 234 } while (0)
 235
 236 #define GET_CANONNAME(ai, str) \
 237 do { \
 238         /* external reference: pai, error and label free */ \
 239         error = get_canonname(pai, (ai), (str)); \
 240         if (error != 0) \
 241                 goto free; \
 242 } while (0)
 243
 244 #define ERR(err) \
 245 do { \
 246         /* external reference: error, and label bad */ \
 247         error = (err); \
 248         goto bad; \
 249 } while (0)
 250
 251 #define MATCH_FAMILY(x, y, w) \
 252         ((x) == (y) || ((w) && ((x) == PF_UNSPEC || (y) == PF_UNSPEC)))
 253 #define MATCH(x, y, w) \
 254         ((x) == (y) || ((w) && ((x) == ANY || (y) == ANY)))
 255
 256 #if  defined(DEFINE_ADDITIONAL_IPV6_STUFF)
 257 char *
 258 gai_strerror(ecode)
 259         int ecode;
 260 {
 261         if (ecode < 0 || ecode > EAI_MAX)
 262                 ecode = EAI_MAX;
 263         return ai_errlist[ecode];
 264 }
 265 #endif
 266
 267 void
 268 freeaddrinfo(ai)
 269         struct addrinfo *ai;
 270 {
 271         struct addrinfo *next;
 272
 273         do {
 274                 next = ai->ai_next;
 275                 if (ai->ai_canonname)
 276                         free(ai->ai_canonname);
 277                 /* no need to free(ai->ai_addr) */
 278                 free(ai);
 279         } while ((ai = next) != NULL);
 280 }
 281
 282 static int
 283 str_isnumber(p)
 284         const char *p;
 285 {
 286         char *q = (char *)p;
 287         while (*q) {
 288                 if (! isdigit(*q))
 289                         return NO;
 290                 q++;
 291         }
 292         return YES;
 293 }
 294
 295 int
 296 getaddrinfo(hostname, servname, hints, res)
 297         const char *hostname, *servname;
 298         const struct addrinfo *hints;
 299         struct addrinfo **res;
 300 {
 301         struct addrinfo sentinel;
 302         struct addrinfo *cur;
 303         int error = 0;
 304         struct addrinfo ai;
 305         struct addrinfo ai0;
 306         struct addrinfo *pai;
 307         const struct afd *afd;
 308         const struct explore *ex;
 309
 310 #ifdef FAITH
 311         static int firsttime = 1;
 312
 313         if (firsttime) {
 314                 /* translator hack */
 315                 char *q = getenv("GAI");
 316                 if (q && inet_pton(AF_INET6, q, &faith_prefix) == 1)
 317                         translate = YES;
 318                 firsttime = 0;
 319         }
 320 #endif
 321
 322         sentinel.ai_next = NULL;
 323         cur = &sentinel;
 324         pai = &ai;
 325         pai->ai_flags = 0;
 326         pai->ai_family = PF_UNSPEC;
 327         pai->ai_socktype = ANY;
 328         pai->ai_protocol = ANY;
 329         pai->ai_addrlen = 0;
 330         pai->ai_canonname = NULL;
 331         pai->ai_addr = NULL;
 332         pai->ai_next = NULL;
 333
 334         if (hostname == NULL && servname == NULL)
 335                 return EAI_NONAME;
 336         if (hints) {
 337                 /* error check for hints */
 338                 if (hints->ai_addrlen || hints->ai_canonname ||
 339                     hints->ai_addr || hints->ai_next)
 340                         ERR(EAI_BADHINTS); /* xxx */
 341                 if (hints->ai_flags & ~AI_MASK)
 342                         ERR(EAI_BADFLAGS);
 343                 switch (hints->ai_family) {
 344                 case PF_UNSPEC:
 345                 case PF_INET:
 346 #ifdef INET6
 347                 case PF_INET6:
 348 #endif
 349                         break;
 350                 default:
 351                         ERR(EAI_FAMILY);
 352                 }
 353                 memcpy(pai, hints, sizeof(*pai));
 354
 355                 /*
 356                  * if both socktype/protocol are specified, check if they
 357                  * are meaningful combination.
 358                  */
 359                 if (pai->ai_socktype != ANY && pai->ai_protocol != ANY) {
 360                         for (ex = explore; ex->e_af >= 0; ex++) {
 361                                 if (pai->ai_family != ex->e_af)
 362                                         continue;
 363                                 if (ex->e_socktype == ANY)
 364                                         continue;
 365                                 if (ex->e_protocol == ANY)
 366                                         continue;
 367                                 if (pai->ai_socktype == ex->e_socktype
 368                                  && pai->ai_protocol != ex->e_protocol) {
 369                                         ERR(EAI_BADHINTS);
 370                                 }
 371                         }
 372                 }
 373         }
 374
 375         /*
 376          * check for special cases.  (1) numeric servname is disallowed if
 377          * socktype/protocol are left unspecified. (2) servname is disallowed
 378          * for raw and other inet{,6} sockets.
 379          */
 380         if (MATCH_FAMILY(pai->ai_family, PF_INET, 1)
 381 #ifdef PF_INET6
 382          || MATCH_FAMILY(pai->ai_family, PF_INET6, 1)
 383 #endif
 384             ) {
 385                 ai0 = *pai;
 386
 387                 if (pai->ai_family == PF_UNSPEC) {
 388 #ifdef PF_INET6
 389                         pai->ai_family = PF_INET6;
 390 #else
 391                         pai->ai_family = PF_INET;
 392 #endif
 393                 }
 394                 error = get_portmatch(pai, servname);
 395                 if (error)
 396                         ERR(error);
 397
 398                 *pai = ai0;
 399         }
 400
 401         ai0 = *pai;
 402
 403         /* NULL hostname, or numeric hostname */
 404         for (ex = explore; ex->e_af >= 0; ex++) {
 405                 *pai = ai0;
 406
 407                 if (!MATCH_FAMILY(pai->ai_family, ex->e_af, WILD_AF(ex)))
 408                         continue;
 409                 if (!MATCH(pai->ai_socktype, ex->e_socktype, WILD_SOCKTYPE(ex)))
 410                         continue;
 411                 if (!MATCH(pai->ai_protocol, ex->e_protocol, WILD_PROTOCOL(ex)))
 412                         continue;
 413
 414                 if (pai->ai_family == PF_UNSPEC)
 415                         pai->ai_family = ex->e_af;
 416                 if (pai->ai_socktype == ANY && ex->e_socktype != ANY)
 417                         pai->ai_socktype = ex->e_socktype;
 418                 if (pai->ai_protocol == ANY && ex->e_protocol != ANY)
 419                         pai->ai_protocol = ex->e_protocol;
 420
 421                 if (hostname == NULL)
 422                         error = explore_null(pai, hostname, servname, &cur->ai_next);
 423                 else
 424                         error = explore_numeric_scope(pai, hostname, servname, &cur->ai_next);
 425
 426                 if (error)
 427                         goto free;
 428
 429                 while (cur && cur->ai_next)
 430                         cur = cur->ai_next;
 431         }
 432
 433         /*
 434          * XXX
 435          * If numreic representation of AF1 can be interpreted as FQDN
 436          * representation of AF2, we need to think again about the code below.
 437          */
 438         if (sentinel.ai_next)
 439                 goto good;
 440
 441         if (pai->ai_flags & AI_NUMERICHOST)
 442                 ERR(EAI_NONAME);
 443         if (hostname == NULL)
 444                 ERR(EAI_NONAME);
 445
 446         /*
 447          * hostname as alphabetical name.
 448          * we would like to prefer AF_INET6 than AF_INET, so we'll make a
 449          * outer loop by AFs.
 450          */
 451         for (afd = afdl; afd->a_af; afd++) {
 452                 *pai = ai0;
 453
 454                 if (!MATCH_FAMILY(pai->ai_family, afd->a_af, 1))
 455                         continue;
 456
 457                 for (ex = explore; ex->e_af >= 0; ex++) {
 458                         *pai = ai0;
 459
 460                         if (pai->ai_family == PF_UNSPEC)
 461                                 pai->ai_family = afd->a_af;
 462
 463                         if (!MATCH_FAMILY(pai->ai_family, ex->e_af, WILD_AF(ex)))
 464                                 continue;
 465                         if (!MATCH(pai->ai_socktype, ex->e_socktype,
 466                                         WILD_SOCKTYPE(ex))) {
 467                                 continue;
 468                         }
 469                         if (!MATCH(pai->ai_protocol, ex->e_protocol,
 470                                         WILD_PROTOCOL(ex))) {
 471                                 continue;
 472                         }
 473
 474                         if (pai->ai_family == PF_UNSPEC)
 475                                 pai->ai_family = ex->e_af;
 476                         if (pai->ai_socktype == ANY && ex->e_socktype != ANY)
 477                                 pai->ai_socktype = ex->e_socktype;
 478                         if (pai->ai_protocol == ANY && ex->e_protocol != ANY)
 479                                 pai->ai_protocol = ex->e_protocol;
 480
 481                         error = explore_fqdn(pai, hostname, servname,
 482                                 &cur->ai_next);
 483
 484                         while (cur && cur->ai_next)
 485                                 cur = cur->ai_next;
 486                 }
 487         }
 488
 489         /* XXX */
 490         if (sentinel.ai_next)
 491                 error = 0;
 492
 493         if (error)
 494                 goto free;
 495         if (error == 0) {
 496                 if (sentinel.ai_next) {
 497  good:
 498                         *res = sentinel.ai_next;
 499                         return SUCCESS;
 500                 } else
 501                         error = EAI_FAIL;
 502         }
 503  free:
 504  bad:
 505         if (sentinel.ai_next)
 506                 freeaddrinfo(sentinel.ai_next);
 507         *res = NULL;
 508         return error;
 509 }
 510
 511 /*
 512  * FQDN hostname, DNS lookup
 513  */
 514 static int
 515 explore_fqdn(pai, hostname, servname, res)
 516         const struct addrinfo *pai;
 517         const char *hostname;
 518         const char *servname;
 519         struct addrinfo **res;
 520 {
 521         struct hostent *hp;
 522         int h_error;
 523         int af;
 524         char **aplist = NULL, *apbuf = NULL;
 525         char *ap;
 526         struct addrinfo sentinel, *cur;
 527         int i;
 528 #ifndef USE_GETIPNODEBY
 529         int naddrs;
 530 #endif
 531         const struct afd *afd;
 532         int error;
 533
 534         *res = NULL;
 535         sentinel.ai_next = NULL;
 536         cur = &sentinel;
 537
 538         /*
 539          * Do not filter unsupported AFs here.  We need to honor content of
 540          * databases (/etc/hosts, DNS and others).  Otherwise we cannot
 541          * replace gethostbyname() by getaddrinfo().
 542          */
 543
 544         /*
 545          * if the servname does not match socktype/protocol, ignore it.
 546          */
 547         if (get_portmatch(pai, servname) != 0)
 548                 return 0;
 549
 550         afd = find_afd(pai->ai_family);
 551
 552         /*
 553          * post-RFC2553: should look at (pai->ai_flags & AI_ADDRCONFIG)
 554          * rather than hardcoding it.  we may need to add AI_ADDRCONFIG
 555          * handling code by ourselves in case we don't have getipnodebyname().
 556          */
 557 #ifdef USE_GETIPNODEBY
 558         hp = getipnodebyname(hostname, pai->ai_family, AI_ADDRCONFIG, &h_error);
 559 #else
 560 #ifdef HAVE_GETHOSTBYNAME2
 561         hp = gethostbyname2(hostname, pai->ai_family);
 562 #else
 563         if (pai->ai_family != AF_INET)
 564                 return 0;
 565         hp = gethostbyname(hostname);
 566 #ifdef HAVE_H_ERRNO
 567         h_error = h_errno;
 568 #else
 569         h_error = EINVAL;
 570 #endif
 571 #endif /*HAVE_GETHOSTBYNAME2*/
 572 #endif /*USE_GETIPNODEBY*/
 573
 574         if (hp == NULL) {
 575                 switch (h_error) {
 576                 case HOST_NOT_FOUND:
 577                 case NO_DATA:
 578                         error = EAI_NODATA;
 579                         break;
 580                 case TRY_AGAIN:
 581                         error = EAI_AGAIN;
 582                         break;
 583                 case NO_RECOVERY:
 584                 case NETDB_INTERNAL:
 585                 default:
 586                         error = EAI_FAIL;
 587                         break;
 588                 }
 589         } else if ((hp->h_name == NULL) || (hp->h_name[0] == 0)
 590                         || (hp->h_addr_list[0] == NULL)) {
 591 #ifdef USE_GETIPNODEBY
 592                 freehostent(hp);
 593 #endif
 594                 hp = NULL;
 595                 error = EAI_FAIL;
 596         }
 597
 598         if (hp == NULL)
 599                 goto free;
 600
 601 #ifdef USE_GETIPNODEBY
 602         aplist = hp->h_addr_list;
 603 #else
 604         /*
 605          * hp will be overwritten if we use gethostbyname2().
 606          * always deep copy for simplification.
 607          */
 608         for (naddrs = 0; hp->h_addr_list[naddrs] != NULL; naddrs++)
 609                 ;
 610         naddrs++;
 611         aplist = (char **)malloc(sizeof(aplist[0]) * naddrs);
 612         apbuf = (char *)malloc(hp->h_length * naddrs);
 613         if (aplist == NULL || apbuf == NULL) {
 614                 error = EAI_MEMORY;
 615                 goto free;
 616         }
 617         memset(aplist, 0, sizeof(aplist[0]) * naddrs);
 618         for (i = 0; i < naddrs; i++) {
 619                 if (hp->h_addr_list[i] == NULL) {
 620                         aplist[i] = NULL;
 621                         continue;
 622                 }
 623                 memcpy(&apbuf[i * hp->h_length], hp->h_addr_list[i],
 624                         hp->h_length);
 625                 aplist[i] = &apbuf[i * hp->h_length];
 626         }
 627 #endif
 628
 629         for (i = 0; aplist[i] != NULL; i++) {
 630                 af = hp->h_addrtype;
 631                 ap = aplist[i];
 632 #ifdef AF_INET6
 633                 if (af == AF_INET6
 634                  && IN6_IS_ADDR_V4MAPPED((struct in6_addr *)ap)) {
 635                         af = AF_INET;
 636                         ap = ap + sizeof(struct in6_addr)
 637                                 - sizeof(struct in_addr);
 638                 }
 639 #endif
 640
 641                 if (af != pai->ai_family)
 642                         continue;
 643
 644                 if ((pai->ai_flags & AI_CANONNAME) == 0) {
 645                         GET_AI(cur->ai_next, afd, ap);
 646                         GET_PORT(cur->ai_next, servname);
 647                 } else {
 648                         /*
 649                          * if AI_CANONNAME and if reverse lookup
 650                          * fail, return ai anyway to pacify
 651                          * calling application.
 652                          *
 653                          * XXX getaddrinfo() is a name->address
 654                          * translation function, and it looks
 655                          * strange that we do addr->name
 656                          * translation here.
 657                          */
 658                         get_name(ap, afd, &cur->ai_next,
 659                                 ap, pai, servname);
 660                 }
 661
 662                 while (cur && cur->ai_next)
 663                         cur = cur->ai_next;
 664         }
 665
 666         *res = sentinel.ai_next;
 667         return 0;
 668
 669 free:
 670 #ifdef USE_GETIPNODEBY
 671         if (hp)
 672                 freehostent(hp);
 673 #endif
 674         if (aplist)
 675                 free(aplist);
 676         if (apbuf)
 677                 free(apbuf);
 678         if (sentinel.ai_next)
 679                 freeaddrinfo(sentinel.ai_next);
 680         return error;
 681 }
 682
 683 /*
 684  * hostname == NULL.
 685  * passive socket -> anyaddr (0.0.0.0 or ::)
 686  * non-passive socket -> localhost (127.0.0.1 or ::1)
 687  */
 688 static int
 689 explore_null(pai, hostname, servname, res)
 690         const struct addrinfo *pai;
 691         const char *hostname;
 692         const char *servname;
 693         struct addrinfo **res;
 694 {
 695         int s;
 696         const struct afd *afd;
 697         struct addrinfo *cur;
 698         struct addrinfo sentinel;
 699         int error;
 700
 701         *res = NULL;
 702         sentinel.ai_next = NULL;
 703         cur = &sentinel;
 704
 705         /*
 706          * filter out AFs that are not supported by the kernel
 707          * XXX errno?
 708          */
 709         s = socket(pai->ai_family, SOCK_DGRAM, 0);
 710         if (s < 0) {
 711                 if (errno != EMFILE)
 712                         return 0;
 713         } else
 714                 close(s);
 715
 716         /*
 717          * if the servname does not match socktype/protocol, ignore it.
 718          */
 719         if (get_portmatch(pai, servname) != 0)
 720                 return 0;
 721
 722         afd = find_afd(pai->ai_family);
 723
 724         if (pai->ai_flags & AI_PASSIVE) {
 725                 GET_AI(cur->ai_next, afd, afd->a_addrany);
 726                 /* xxx meaningless?
 727                  * GET_CANONNAME(cur->ai_next, "anyaddr");
 728                  */
 729                 GET_PORT(cur->ai_next, servname);
 730         } else {
 731                 GET_AI(cur->ai_next, afd, afd->a_loopback);
 732                 /* xxx meaningless?
 733                  * GET_CANONNAME(cur->ai_next, "localhost");
 734                  */
 735                 GET_PORT(cur->ai_next, servname);
 736         }
 737         cur = cur->ai_next;
 738
 739         *res = sentinel.ai_next;
 740         return 0;
 741
 742 free:
 743         if (sentinel.ai_next)
 744                 freeaddrinfo(sentinel.ai_next);
 745         return error;
 746 }
 747
 748 /*
 749  * numeric hostname
 750  */
 751 static int
 752 explore_numeric(pai, hostname, servname, res)
 753         const struct addrinfo *pai;
 754         const char *hostname;
 755         const char *servname;
 756         struct addrinfo **res;
 757 {
 758         const struct afd *afd;
 759         struct addrinfo *cur;
 760         struct addrinfo sentinel;
 761         int error;
 762         char pton[PTON_MAX];
 763         int flags;
 764
 765         *res = NULL;
 766         sentinel.ai_next = NULL;
 767         cur = &sentinel;
 768
 769         /*
 770          * if the servname does not match socktype/protocol, ignore it.
 771          */
 772         if (get_portmatch(pai, servname) != 0)
 773                 return 0;
 774
 775         afd = find_afd(pai->ai_family);
 776         flags = pai->ai_flags;
 777
 778         if (inet_pton(afd->a_af, hostname, pton) == 1) {
 779                 u_int32_t v4a;
 780 #ifdef INET6
 781                 u_char pfx;
 782 #endif
 783
 784                 switch (afd->a_af) {
 785                 case AF_INET:
 786                         v4a = (u_int32_t)ntohl(((struct in_addr *)pton)->s_addr);
 787                         if (IN_MULTICAST(v4a) || IN_EXPERIMENTAL(v4a))
 788                                 flags &= ~AI_CANONNAME;
 789                         v4a >>= IN_CLASSA_NSHIFT;
 790                         if (v4a == 0 || v4a == IN_LOOPBACKNET)
 791                                 flags &= ~AI_CANONNAME;
 792                         break;
 793 #ifdef INET6
 794                 case AF_INET6:
 795                         pfx = ((struct in6_addr *)pton)->s6_addr[0];
 796                         if (pfx == 0 || pfx == 0xfe || pfx == 0xff)
 797                                 flags &= ~AI_CANONNAME;
 798                         break;
 799 #endif
 800                 }
 801
 802                 if (pai->ai_family == afd->a_af ||
 803                     pai->ai_family == PF_UNSPEC /*?*/) {
 804                         if ((flags & AI_CANONNAME) == 0) {
 805                                 GET_AI(cur->ai_next, afd, pton);
 806                                 GET_PORT(cur->ai_next, servname);
 807                         } else {
 808                                 /*
 809                                  * if AI_CANONNAME and if reverse lookup
 810                                  * fail, return ai anyway to pacify
 811                                  * calling application.
 812                                  *
 813                                  * XXX getaddrinfo() is a name->address
 814                                  * translation function, and it looks
 815                                  * strange that we do addr->name
 816                                  * translation here.
 817                                  */
 818                                 get_name(pton, afd, &cur->ai_next,
 819                                         pton, pai, servname);
 820                         }
 821                         while (cur && cur->ai_next)
 822                                 cur = cur->ai_next;
 823                 } else
 824                         ERR(EAI_FAMILY);        /*xxx*/
 825         }
 826
 827         *res = sentinel.ai_next;
 828         return 0;
 829
 830 free:
 831 bad:
 832         if (sentinel.ai_next)
 833                 freeaddrinfo(sentinel.ai_next);
 834         return error;
 835 }
 836
 837 /*
 838  * numeric hostname with scope
 839  */
 840 static int
 841 explore_numeric_scope(pai, hostname, servname, res)
 842         const struct addrinfo *pai;
 843         const char *hostname;
 844         const char *servname;
 845         struct addrinfo **res;
 846 {
 847 #ifndef SCOPE_DELIMITER
 848         return explore_numeric(pai, hostname, servname, res);
 849 #else
 850         const struct afd *afd;
 851         struct addrinfo *cur;
 852         int error;
 853         char *cp, *hostname2 = NULL;
 854         int scope;
 855         struct sockaddr_in6 *sin6;
 856
 857         /*
 858          * if the servname does not match socktype/protocol, ignore it.
 859          */
 860         if (get_portmatch(pai, servname) != 0)
 861                 return 0;
 862
 863         afd = find_afd(pai->ai_family);
 864         if (!afd->a_scoped)
 865                 return explore_numeric(pai, hostname, servname, res);
 866
 867         cp = strchr(hostname, SCOPE_DELIMITER);
 868         if (cp == NULL)
 869                 return explore_numeric(pai, hostname, servname, res);
 870
 871         /*
 872          * Handle special case of <scoped_address><delimiter><scope id>
 873          */
 874         hostname2 = strdup(hostname);
 875         if (hostname2 == NULL)
 876                 return EAI_MEMORY;
 877         /* terminate at the delimiter */
 878         hostname2[cp - hostname] = '\0';
 879
 880         cp++;
 881         switch (pai->ai_family) {
 882 #ifdef INET6
 883         case AF_INET6:
 884                 scope = if_nametoindex(cp);
 885                 if (scope == 0) {
 886                         free(hostname2);
 887                         return (EAI_NONAME);
 888                 }
 889                 break;
 890 #endif
 891         }
 892
 893         error = explore_numeric(pai, hostname2, servname, res);
 894         if (error == 0) {
 895                 for (cur = *res; cur; cur = cur->ai_next) {
 896                         if (cur->ai_family != AF_INET6)
 897                                 continue;
 898                         sin6 = (struct sockaddr_in6 *)cur->ai_addr;
 899                         if (IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr) ||
 900                             IN6_IS_ADDR_MC_LINKLOCAL(&sin6->sin6_addr))
 901                                 sin6->sin6_scope_id = scope;
 902                 }
 903         }
 904
 905         free(hostname2);
 906
 907         return error;
 908 #endif
 909 }
 910
 911 static int
 912 get_name(addr, afd, res, numaddr, pai, servname)
 913         const char *addr;
 914         const struct afd *afd;
 915         struct addrinfo **res;
 916         char *numaddr;
 917         const struct addrinfo *pai;
 918         const char *servname;
 919 {
 920         struct hostent *hp = NULL;
 921         struct addrinfo *cur = NULL;
 922         int error = 0;
 923         char *ap = NULL, *cn = NULL;
 924 #ifdef USE_GETIPNODEBY
 925         int h_error;
 926
 927         hp = getipnodebyaddr(addr, afd->a_addrlen, afd->a_af, &h_error);
 928 #else
 929         hp = gethostbyaddr(addr, afd->a_addrlen, afd->a_af);
 930 #endif
 931         if (hp && hp->h_name && hp->h_name[0] && hp->h_addr_list[0]) {
 932 #ifdef USE_GETIPNODEBY
 933                 GET_AI(cur, afd, hp->h_addr_list[0]);
 934                 GET_PORT(cur, servname);
 935                 GET_CANONNAME(cur, hp->h_name);
 936 #else
 937                 /* hp will be damaged if we use gethostbyaddr() */
 938                 if ((ap = (char *)malloc(hp->h_length)) == NULL) {
 939                         error = EAI_MEMORY;
 940                         goto free;
 941                 }
 942                 memcpy(ap, hp->h_addr_list[0], hp->h_length);
 943                 if ((cn = strdup(hp->h_name)) == NULL) {
 944                         error = EAI_MEMORY;
 945                         goto free;
 946                 }
 947
 948                 GET_AI(cur, afd, ap);
 949                 GET_PORT(cur, servname);
 950                 GET_CANONNAME(cur, cn);
 951                 free(ap); ap = NULL;
 952                 free(cn); cn = NULL;
 953 #endif
 954         } else {
 955                 GET_AI(cur, afd, numaddr);
 956                 GET_PORT(cur, servname);
 957         }
 958
 959 #ifdef USE_GETIPNODEBY
 960         if (hp)
 961                 freehostent(hp);
 962 #endif
 963         *res = cur;
 964         return SUCCESS;
 965  free:
 966         if (cur)
 967                 freeaddrinfo(cur);
 968         if (ap)
 969                 free(ap);
 970         if (cn)
 971                 free(cn);
 972 #ifdef USE_GETIPNODEBY
 973         if (hp)
 974                 freehostent(hp);
 975 #endif
 976         *res = NULL;
 977         return error;
 978 }
 979
 980 static int
 981 get_canonname(pai, ai, str)
 982         const struct addrinfo *pai;
 983         struct addrinfo *ai;
 984         const char *str;
 985 {
 986         if ((pai->ai_flags & AI_CANONNAME) != 0) {
 987                 ai->ai_canonname = strdup(str);
 988                 if (ai->ai_canonname == NULL)
 989                         return EAI_MEMORY;
 990         }
 991         return 0;
 992 }
 993
 994 static struct addrinfo *
 995 get_ai(pai, afd, addr)
 996         const struct addrinfo *pai;
 997         const struct afd *afd;
 998         const char *addr;
 999 {
1000         char *p;
1001         struct addrinfo *ai;
1002
1003         ai = (struct addrinfo *)malloc(sizeof(struct addrinfo)
1004                 + (afd->a_socklen));
1005         if (ai == NULL)
1006                 return NULL;
1007
1008         memcpy(ai, pai, sizeof(struct addrinfo));
1009         ai->ai_addr = (struct sockaddr *)(ai + 1);
1010         memset(ai->ai_addr, 0, afd->a_socklen);
1011 #ifdef HAVE_SOCKADDR_SA_LEN
1012         ai->ai_addr->sa_len = afd->a_socklen;
1013 #endif
1014         ai->ai_addrlen = afd->a_socklen;
1015         ai->ai_addr->sa_family = ai->ai_family = afd->a_af;
1016         p = (char *)(ai->ai_addr);
1017         memcpy(p + afd->a_off, addr, afd->a_addrlen);
1018         return ai;
1019 }
1020
1021 static int
1022 get_portmatch(ai, servname)
1023         const struct addrinfo *ai;
1024         const char *servname;
1025 {
1026
1027         /* get_port does not touch first argument. when matchonly == 1. */
1028         return get_port((struct addrinfo *)ai, servname, 1);
1029 }
1030
1031 static int
1032 get_port(ai, servname, matchonly)
1033         struct addrinfo *ai;
1034         const char *servname;
1035         int matchonly;
1036 {
1037         const char *proto;
1038         struct servent *sp;
1039         int port;
1040         int allownumeric;
1041
1042         if (servname == NULL)
1043                 return 0;
1044         switch (ai->ai_family) {
1045         case AF_INET:
1046 #ifdef AF_INET6
1047         case AF_INET6:
1048 #endif
1049                 break;
1050         default:
1051                 return 0;
1052         }
1053
1054         switch (ai->ai_socktype) {
1055         case SOCK_RAW:
1056                 return EAI_SERVICE;
1057         case SOCK_DGRAM:
1058         case SOCK_STREAM:
1059                 allownumeric = 1;
1060                 break;
1061         case ANY:
1062                 allownumeric = 0;
1063                 break;
1064         default:
1065                 return EAI_SOCKTYPE;
1066         }
1067
1068         if (str_isnumber(servname)) {
1069                 if (!allownumeric)
1070                         return EAI_SERVICE;
1071                 port = htons(atoi(servname));
1072                 if (port < 0 || port > 65535)
1073                         return EAI_SERVICE;
1074         } else {
1075                 switch (ai->ai_socktype) {
1076                 case SOCK_DGRAM:
1077                         proto = "udp";
1078                         break;
1079                 case SOCK_STREAM:
1080                         proto = "tcp";
1081                         break;
1082                 default:
1083                         proto = NULL;
1084                         break;
1085                 }
1086
1087                 if ((sp = getservbyname(servname, proto)) == NULL)
1088                         return EAI_SERVICE;
1089                 port = sp->s_port;
1090         }
1091
1092         if (!matchonly) {
1093                 switch (ai->ai_family) {
1094                 case AF_INET:
1095                         ((struct sockaddr_in *)ai->ai_addr)->sin_port = port;
1096                         break;
1097 #ifdef INET6
1098                 case AF_INET6:
1099                         ((struct sockaddr_in6 *)ai->ai_addr)->sin6_port = port;
1100                         break;
1101 #endif
1102                 }
1103         }
1104
1105         return 0;
1106 }
1107
1108 static const struct afd *
1109 find_afd(af)
1110         int af;
1111 {
1112         const struct afd *afd;
1113
1114         if (af == PF_UNSPEC)
1115                 return NULL;
1116         for (afd = afdl; afd->a_af; afd++) {
1117                 if (afd->a_af == af)
1118                         return afd;
1119         }
1120         return NULL;
1121 }
1122
1123
1124 #endif /*__MING64__*/