lookup.subproj/si_getaddrinfo.c

   1 /*
   2  * Copyright (c) 2008-2009 Apple Inc.  All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * This file contains Original Code and/or Modifications of Original Code
   7  * as defined in and that are subject to the Apple Public Source License
   8  * Version 2.0 (the 'License'). You may not use this file except in
   9  * compliance with the License. Please obtain a copy of the License at
  10  * http://www.opensource.apple.com/apsl/ and read it before using this
  11  * file.
  12  *
  13  * The Original Code and all software distributed under the License are
  14  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  15  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  16  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  18  * Please see the License for the specific language governing rights and
  19  * limitations under the License.
  20  *
  21  * @APPLE_LICENSE_HEADER_END@
  22  */
  23
  24 #include <netdb.h>
  25 #include <sys/types.h>
  26 #include <ctype.h>
  27 #include <stdio.h>
  28 #include <stdint.h>
  29 #include <sys/socket.h>
  30 #include <net/if.h>
  31 #include <netinet/in.h>
  32 #include <arpa/inet.h>
  33 #include <ifaddrs.h>
  34 #include <net/if.h>
  35 #include <string.h>
  36 #include <sys/param.h>
  37 #include <TargetConditionals.h>
  38 #include "netdb_async.h"
  39 #include "si_module.h"
  40
  41 #define SOCK_UNSPEC 0
  42 #define IPPROTO_UNSPEC 0
  43
  44 #define IPV6_ADDR_LEN 16
  45 #define IPV4_ADDR_LEN 4
  46
  47 #define WANT_NOTHING 0
  48 #define WANT_A4_ONLY 1
  49 #define WANT_A6_ONLY 2
  50 #define WANT_A6_PLUS_MAPPED_A4 3
  51 #define WANT_A6_OR_MAPPED_A4_IF_NO_A6 4
  52
  53 typedef struct {
  54         struct hostent host;
  55         int alias_count;
  56         int addr_count;
  57         uint64_t ttl;
  58 } build_hostent_t;
  59
  60 void
  61 freeaddrinfo(struct addrinfo *a)
  62 {
  63         struct addrinfo *next;
  64
  65         while (a != NULL)
  66         {
  67                 next = a->ai_next;
  68                 if (a->ai_addr != NULL) free(a->ai_addr);
  69                 if (a->ai_canonname != NULL) free(a->ai_canonname);
  70                 free(a);
  71                 a = next;
  72         }
  73 }
  74
  75 const char *
  76 gai_strerror(int32_t err)
  77 {
  78         switch (err)
  79         {
  80                 case EAI_ADDRFAMILY: return "Address family for nodename not supported";
  81                 case EAI_AGAIN: return "Temporary failure in name resolution";
  82                 case EAI_BADFLAGS:      return "Invalid value for ai_flags";
  83                 case EAI_FAIL: return "Non-recoverable failure in name resolution";
  84                 case EAI_FAMILY: return "ai_family not supported";
  85                 case EAI_MEMORY: return "Memory allocation failure";
  86                 case EAI_NODATA: return "No address associated with nodename";
  87                 case EAI_NONAME: return "nodename nor servname provided, or not known";
  88                 case EAI_SERVICE: return "servname not supported for ai_socktype";
  89                 case EAI_SOCKTYPE: return "ai_socktype not supported";
  90                 case EAI_SYSTEM: return "System error";
  91                 case EAI_BADHINTS: return "Bad hints";
  92                 case EAI_PROTOCOL: return "ai_protocol not supported";
  93                 case EAI_OVERFLOW: return "argument buffer overflow";
  94         }
  95
  96         return "Unknown error";
  97 }
  98
  99 /*
 100  * getnameinfo
 101  *
 102  * We handle some "trival" cases locally.  If the caller passes
 103  * NI_NUMERICHOST (only), then this call turns into a getservbyport
 104  * to get the service name + inet_pton() to create a host string.
 105  * If the caller passes NI_NUMERICSERV (only), then we zero out the port
 106  * number, complete the getnameinfo, and use printf() to create a service
 107  * string.  If the caller specifies both NI_NUMERICHOST and NI_NUMERICSERV,
 108  * we inet_ntop() and printf() and return the results.
 109  */
 110 __private_extern__ si_item_t *
 111 si_nameinfo(si_mod_t *si, const struct sockaddr *sa, int flags, uint32_t *err)
 112 {
 113         si_item_t *out = NULL;
 114         const struct sockaddr *lookup_sa;
 115         struct sockaddr_in s4;
 116         struct in_addr a4;
 117         struct in6_addr a6;
 118         const uint64_t unused = 0;
 119         void *addr = NULL;
 120         char *host = NULL;
 121         char *serv = NULL;
 122         uint32_t ifnum = 0;
 123         uint16_t port = 0;
 124
 125         int do_host_lookup = ((flags & NI_NUMERICHOST) == 0);
 126         int do_serv_lookup = ((flags & NI_NUMERICSERV) == 0);
 127
 128         /* check input */
 129         if ((si == NULL) || (sa == NULL))
 130         {
 131                 if (err != NULL) *err = SI_STATUS_EAI_FAIL;
 132                 return NULL;
 133         }
 134
 135         if (err != NULL) *err = SI_STATUS_NO_ERROR;
 136
 137         lookup_sa = sa;
 138
 139         if (sa->sa_family == AF_INET)
 140         {
 141                 struct sockaddr_in *s4 = (struct sockaddr_in *)sa;
 142                 memcpy(&a4, &s4->sin_addr, sizeof(a4));
 143                 port = s4->sin_port;
 144                 addr = &a4;
 145         }
 146         else if (sa->sa_family == AF_INET6)
 147         {
 148                 struct sockaddr_in6 *s6 = (struct sockaddr_in6 *)sa;
 149                 memcpy(&a6, &s6->sin6_addr, sizeof(a6));
 150                 port = s6->sin6_port;
 151
 152                 /* Look for link-local IPv6 scope id */
 153                 if (IN6_IS_ADDR_LINKLOCAL(&s6->sin6_addr))
 154                 {
 155                         ifnum = ntohs(a6.__u6_addr.__u6_addr16[1]);
 156                         if (ifnum == 0)
 157                         {
 158                                 ifnum = s6->sin6_scope_id;
 159                                 a6.__u6_addr.__u6_addr16[1] = htons(ifnum);
 160                         }
 161
 162                         if (ifnum != s6->sin6_scope_id &&
 163                             s6->sin6_scope_id != 0)
 164                         {
 165                                 if (err != NULL) *err = SI_STATUS_EAI_FAIL;
 166                                 return NULL;
 167                         }
 168                 }
 169
 170                 /* v4 mapped and compat addresses are converted to plain v4 */
 171                 if (IN6_IS_ADDR_V4MAPPED(&s6->sin6_addr) || IN6_IS_ADDR_V4COMPAT(&s6->sin6_addr))
 172                 {
 173                         memcpy(&a4, &s6->sin6_addr.s6_addr[12], sizeof(a4));
 174                         addr = &a4;
 175                         memset(&s4, 0, sizeof(s4));
 176                         s4.sin_len = sizeof(s4);
 177                         s4.sin_family = AF_INET;
 178                         s4.sin_port = port;
 179                         memcpy(&s4.sin_addr, &a4, sizeof(s4.sin_addr));
 180                         lookup_sa = (const struct sockaddr *)&s4;
 181                 }
 182                 else
 183                 {
 184                         addr = &a6;
 185                 }
 186         }
 187         else
 188         {
 189                 if (err != NULL) *err = SI_STATUS_EAI_FAMILY;
 190                 return NULL;
 191         }
 192
 193         if (do_host_lookup == 1)
 194         {
 195 #if 0
 196                 if ((do_serv_lookup == 1) && (si->sim_nameinfo != NULL))
 197                 {
 198                         return si->sim_nameinfo(si, lookup_sa, flags, err);
 199                 }
 200 #endif
 201                 si_item_t *item = si_host_byaddr(si, addr, lookup_sa->sa_family, NULL);
 202                 if (item != NULL)
 203                 {
 204                         struct hostent *h;
 205                         h = (struct hostent *)((uintptr_t)item + sizeof(si_item_t));
 206                         host = strdup(h->h_name);
 207                         si_item_release(item);
 208                         if (host == NULL)
 209                         {
 210                                 if (err != NULL) *err = SI_STATUS_EAI_MEMORY;
 211                                 return NULL;
 212                         }
 213                 }
 214         }
 215
 216         if ((do_serv_lookup == 1) && (port != 0))
 217         {
 218                 si_item_t *item = si_service_byport(si, port, NULL);
 219                 if (item != NULL)
 220                 {
 221                         struct servent *s;
 222                         s = (struct servent *)((uintptr_t)item + sizeof(si_item_t));
 223                         serv = strdup(s->s_name);
 224                         si_item_release(item);
 225                         if (serv == NULL)
 226                         {
 227                                 free(host);
 228                                 if (err != NULL) *err = SI_STATUS_EAI_MEMORY;
 229                                 return NULL;
 230                         }
 231                 }
 232         }
 233
 234         /*
 235          * Return numeric host name for NI_NUMERICHOST or if lookup failed, but not
 236          * if NI_NAMEREQD is specified (so that we later fail with EAI_NONAME).
 237          */
 238         if (host == NULL && (flags & NI_NAMEREQD) == 0)
 239         {
 240                 char tmp[INET6_ADDRSTRLEN + 1 + IF_NAMESIZE + 1];
 241                 tmp[0] = '\0';
 242                 if (sa->sa_family == AF_INET)
 243                 {
 244                         char buf[INET_ADDRSTRLEN];
 245                         if (inet_ntop(AF_INET, &a4, buf, sizeof(buf)) != 0)
 246                         {
 247                                 host = strdup(buf);
 248                         }
 249                 }
 250                 else if (sa->sa_family == AF_INET6)
 251                 {
 252                         char buf[INET6_ADDRSTRLEN];
 253
 254                         /* zero the embedded scope ID */
 255                         if (ifnum != 0)
 256                         {
 257                                 a6.__u6_addr.__u6_addr16[1] = 0;
 258                         }
 259
 260                         if (inet_ntop(AF_INET6, &a6, buf, sizeof(buf)) != 0)
 261                         {
 262                                 if (ifnum != 0)
 263                                 {
 264                                         char ifname[IF_NAMESIZE];
 265                                         if (if_indextoname(ifnum, ifname) != NULL)
 266                                         {
 267                                                 asprintf(&host, "%s%%%s", buf, ifname);
 268                                         }
 269                                         else
 270                                         {
 271                                                 /* ENXIO */
 272                                                 if (err != NULL) *err = SI_STATUS_EAI_FAIL;
 273                                                 return NULL;
 274                                         }
 275                                 }
 276                                 else
 277                                 {
 278                                         host = strdup(buf);
 279                                 }
 280                         }
 281                 }
 282         }
 283
 284         /* Return numeric service name for NI_NUMERICSERV or if lookup failed. */
 285         if (serv == NULL)
 286         {
 287                 asprintf(&serv, "%hu", ntohs(port));
 288         }
 289
 290         if ((host == NULL) || (serv == NULL))
 291         {
 292                 if (err != NULL)
 293                 {
 294                         if ((flags & NI_NAMEREQD) != 0)
 295                         {
 296                                 *err = SI_STATUS_EAI_NONAME;
 297                         }
 298                         else
 299                         {
 300                                 *err = SI_STATUS_EAI_MEMORY;
 301                         }
 302                 }
 303         }
 304         else
 305         {
 306                 out = (si_item_t *)LI_ils_create("L4488ss", (unsigned long)si, CATEGORY_NAMEINFO, 1, unused, unused, host, serv);
 307         }
 308
 309         free(host);
 310         free(serv);
 311         return out;
 312 }
 313
 314 static int
 315 _gai_numericserv(const char *serv, uint16_t *port)
 316 {
 317         int numeric;
 318         char *endptr;
 319         long num;
 320
 321         numeric = 0;
 322
 323         if (serv == NULL)
 324         {
 325                 if (port) *port = 0;
 326                 numeric = 1;
 327         }
 328         else
 329         {
 330                 num = strtol(serv, &endptr, 10);
 331                 if ((serv[0] != '\0') && (*endptr == '\0') && (num >= 0) && (num <= UINT16_MAX))
 332                 {
 333                         numeric = 1;
 334                         if (port != NULL) *port = (uint16_t)num;
 335                 }
 336         }
 337
 338         return numeric;
 339 }
 340
 341 __private_extern__ int
 342 _gai_serv_to_port(const char *serv, uint32_t proto, uint16_t *port)
 343 {
 344         si_item_t *item;
 345         struct servent *s;
 346         const char *protoname = NULL;
 347
 348         if (_gai_numericserv(serv, port)) return 0;
 349
 350         if (proto == IPPROTO_UDP) protoname = "udp";
 351         if (proto == IPPROTO_TCP) protoname = "tcp";
 352
 353         item = si_service_byname(si_search(), serv, protoname);
 354         if (item == NULL) return -1;
 355
 356         s = (struct servent *)((uintptr_t)item + sizeof(si_item_t));
 357         if (port) *port = ntohs(s->s_port);
 358         si_item_release(item);
 359
 360         return 0;
 361 }
 362
 363 __private_extern__ si_item_t *
 364 si_addrinfo_v4(si_mod_t *si, int32_t flags, int32_t sock, int32_t proto, uint16_t port, struct in_addr *addr, uint16_t iface, const char *cname)
 365 {
 366         socket_data_t sockdata;
 367         struct sockaddr_in *sa;
 368         int32_t len, v32;
 369         uint64_t unused;
 370
 371         unused = 0;
 372         len = sizeof(struct sockaddr_in);
 373         memset(&sockdata, 0, sizeof(socket_data_t));
 374         sa = (struct sockaddr_in *)&sockdata;
 375
 376         sa->sin_len = len;
 377         sa->sin_family = AF_INET;
 378         sa->sin_port = htons(port);
 379         memcpy(&sa->sin_addr, addr, sizeof(sa->sin_addr));
 380
 381         /* Kludge: Jam the interface number into sin_zero (4 bytes). */
 382         v32 = iface;
 383         memmove(sa->sin_zero, &v32, sizeof(uint32_t));
 384
 385         return (si_item_t *)LI_ils_create("L448844444Ss", (unsigned long)si, CATEGORY_ADDRINFO, 1, unused, unused, flags, AF_INET, sock, proto, len, sockdata, cname);
 386 }
 387
 388 __private_extern__ si_item_t *
 389 si_addrinfo_v6(si_mod_t *si, int32_t flags, int32_t sock, int32_t proto, uint16_t port, struct in6_addr *addr, uint16_t iface, const char *cname)
 390 {
 391         socket_data_t sockdata;
 392         struct sockaddr_in6 *sa;
 393         int32_t len;
 394         uint64_t unused;
 395
 396         unused = 0;
 397         len = sizeof(struct sockaddr_in6);
 398         memset(&sockdata, 0, sizeof(socket_data_t));
 399         sa = (struct sockaddr_in6 *)&sockdata;
 400
 401         sa->sin6_len = len;
 402         sa->sin6_family = AF_INET6;
 403         sa->sin6_port = htons(port);
 404         memcpy(&sa->sin6_addr, addr, sizeof(sa->sin6_addr));
 405
 406         /* sin6_scope_id is in host byte order */
 407         sa->sin6_scope_id = iface;
 408
 409         if (IN6_IS_ADDR_LINKLOCAL(&sa->sin6_addr))
 410         {
 411                 /* check for embedded scopeid */
 412                 uint16_t esid = ntohs(sa->sin6_addr.__u6_addr.__u6_addr16[1]);
 413                 if (esid != 0)
 414                 {
 415                         sa->sin6_addr.__u6_addr.__u6_addr16[1] = 0;
 416                         if (iface == 0) sa->sin6_scope_id = esid;
 417                 }
 418         }
 419
 420         return (si_item_t *)LI_ils_create("L448844444Ss", (unsigned long)si, CATEGORY_ADDRINFO, 1, unused, unused, flags, AF_INET6, sock, proto, len, sockdata, cname);
 421 }
 422
 423 __private_extern__ si_list_t *
 424 si_addrinfo_list(si_mod_t *si, int socktype, int proto, struct in_addr *a4, struct in6_addr *a6, int port, int scopeid, const char *cname4, const char *cname6)
 425 {
 426         si_item_t *item = NULL;
 427         si_list_t *out4 = NULL, *out6 = NULL;
 428         if (a4 != NULL)
 429         {
 430                 if ((proto == IPPROTO_UNSPEC) || (proto == IPPROTO_UDP))
 431                 {
 432                         item = si_addrinfo_v4(si, 0, SOCK_DGRAM, IPPROTO_UDP, port, a4, 0, cname4);
 433                         out4 = si_list_add(out4, item);
 434                         si_item_release(item);
 435                 }
 436
 437                 if ((proto == IPPROTO_UNSPEC) || (proto == IPPROTO_TCP))
 438                 {
 439                         item = si_addrinfo_v4(si, 0, SOCK_STREAM, IPPROTO_TCP, port, a4, 0, cname4);
 440                         out4 = si_list_add(out4, item);
 441                         si_item_release(item);
 442                 }
 443
 444                 if (proto == IPPROTO_ICMP)
 445                 {
 446                         item = si_addrinfo_v4(si, 0, SOCK_RAW, IPPROTO_ICMP, port, a4, 0, cname4);
 447                         out4 = si_list_add(out4, item);
 448                         si_item_release(item);
 449                 }
 450         }
 451
 452         if (a6 != NULL)
 453         {
 454                 if ((proto == IPPROTO_UNSPEC) || (proto == IPPROTO_UDP))
 455                 {
 456                         item = si_addrinfo_v6(si, 0, SOCK_DGRAM, IPPROTO_UDP, port, a6, scopeid, cname6);
 457                         out6 = si_list_add(out6, item);
 458                         si_item_release(item);
 459                 }
 460
 461                 if ((proto == IPPROTO_UNSPEC) || (proto == IPPROTO_TCP))
 462                 {
 463                         item = si_addrinfo_v6(si, 0, SOCK_STREAM, IPPROTO_TCP, port, a6, scopeid, cname6);
 464                         out6 = si_list_add(out6, item);
 465                         si_item_release(item);
 466                 }
 467
 468                 if (proto == IPPROTO_ICMPV6)
 469                 {
 470                         item = si_addrinfo_v6(si, 0, SOCK_RAW, IPPROTO_ICMPV6, port, a6, scopeid, cname6);
 471                         out6 = si_list_add(out6, item);
 472                         si_item_release(item);
 473                 }
 474         }
 475
 476         out6 = si_list_concat(out6, out4);
 477         si_list_release(out4);
 478
 479         return out6;
 480 }
 481
 482 /*
 483  * _gai_numerichost
 484  * Determines whether the given host name is a numeric IPv4 or IPv6 address,
 485  * based on the address family input value.  If the input addres family is
 486  * unspecified, a more specific value will be provided on output if possible.
 487  * Returns 1 if host name is numeric or 0 if not, or -1 on error.
 488  */
 489 static int
 490 _gai_numerichost(const char* nodename, uint32_t *family, int flags, struct in_addr *a4, struct in6_addr *a6)
 491 {
 492         int numerichost, passive;
 493
 494         numerichost = 0;
 495
 496         if (nodename == NULL)
 497         {
 498                 /* return loopback or passive addresses */
 499                 passive = (flags & AI_PASSIVE);
 500
 501                 if ((*family == AF_UNSPEC) || (*family == AF_INET))
 502                 {
 503                         if (passive) a4->s_addr = 0;
 504                         else a4->s_addr = htonl(INADDR_LOOPBACK);
 505                 }
 506
 507                 if ((*family == AF_UNSPEC) || (*family == AF_INET6))
 508                 {
 509                         memset(a6, 0, sizeof(*a6));
 510                         if (!passive) a6->__u6_addr.__u6_addr32[3] = htonl(1);
 511                 }
 512
 513                 numerichost = 1;
 514         }
 515         else
 516         {
 517                 /* numeric IPv4 host valid for AF_UNSPEC and AF_INET */
 518                 numerichost = inet_pton(AF_INET, nodename, a4);
 519                 if (numerichost == 1)
 520                 {
 521                         if (*family == AF_UNSPEC) *family = AF_INET;
 522                         else if (*family == AF_INET6) numerichost = -1;
 523                         return numerichost;
 524                 }
 525
 526                 /* numeric IPv6 host valid for AF_UNSPEC and AF_INET6 */
 527                 numerichost = inet_pton(AF_INET6, nodename, a6);
 528                 if (numerichost == 1)
 529                 {
 530                         if (*family == AF_UNSPEC) *family = AF_INET6;
 531                         else if (*family == AF_INET) numerichost = -1;
 532                         return numerichost;
 533                 }
 534         }
 535
 536         return numerichost;
 537 }
 538
 539 /* si_addrinfo_list_from_hostent
 540  * Returns an addrinfo list from IPv4 and IPv6 hostent entries
 541  */
 542 __private_extern__ si_list_t *
 543 si_addrinfo_list_from_hostent(si_mod_t *si, uint32_t socktype, uint32_t proto, uint16_t port, uint16_t scope, const struct hostent *h4, const struct hostent *h6)
 544 {
 545         int i;
 546         si_list_t *out = NULL;
 547         si_list_t *list;
 548
 549         if ((h6 != NULL) && (h6->h_addr_list != NULL))
 550         {
 551                 for (i = 0; h6->h_addr_list[i] != NULL; i++)
 552                 {
 553                         struct in6_addr a6;
 554                         memcpy(&a6, h6->h_addr_list[i], h6->h_length);
 555                         list = si_addrinfo_list(si, socktype, proto, NULL, &a6, port, scope, NULL, h6->h_name);
 556                         out = si_list_concat(out, list);
 557                         si_list_release(list);
 558                 }
 559         }
 560
 561         if ((h4 != NULL) && (h4->h_addr_list != NULL))
 562         {
 563                 for (i = 0; h4->h_addr_list[i] != NULL; i++)
 564                 {
 565                         struct in_addr a4;
 566                         memcpy(&a4, h4->h_addr_list[i], h4->h_length);
 567                         list = si_addrinfo_list(si, socktype, proto, &a4, NULL, port, 0, h4->h_name, NULL);
 568                         out = si_list_concat(out, list);
 569                         si_list_release(list);
 570                 }
 571         }
 572
 573         return out;
 574 }
 575
 576 /* _gai_simple
 577  * Simple lookup via gethostbyname2(3) mechanism.
 578  */
 579 static si_list_t *
 580 _gai_simple(si_mod_t *si, const void *nodeptr, const void *servptr, uint32_t family, uint32_t socktype, uint32_t proto, uint32_t flags, uint32_t *err)
 581 {
 582         si_item_t *h4_item = NULL, *h6_item = NULL;
 583         struct hostent *h4 = NULL, *h6 = NULL;
 584         si_list_t *out = NULL;
 585         uint16_t port;
 586
 587         if ((flags & AI_NUMERICSERV) != 0)
 588         {
 589                 port = *(uint16_t*)servptr;
 590         }
 591         else
 592         {
 593                 if (_gai_serv_to_port(servptr, proto, &port) != 0)
 594                 {
 595                         if (err) *err = SI_STATUS_EAI_NONAME;
 596                         return NULL;
 597                 }
 598         }
 599
 600         if ((flags & AI_NUMERICHOST) != 0)
 601         {
 602                 if (family == AF_INET)
 603                 {
 604                         h4_item = si_host_byaddr(si, nodeptr, AF_INET, NULL);
 605                 }
 606                 else if (family == AF_INET6)
 607                 {
 608                         h6_item = si_host_byaddr(si, nodeptr, AF_INET6, NULL);
 609                 }
 610         }
 611         else
 612         {
 613                 if ((family == AF_INET) || (family == AF_UNSPEC))
 614                 {
 615                         h4_item = si_host_byname(si, nodeptr, AF_INET, NULL);
 616                 }
 617 #if !TARGET_OS_EMBEDDED
 618                 if ((family == AF_INET6) || (family == AF_UNSPEC))
 619                 {
 620                         h6_item = si_host_byname(si, nodeptr, AF_INET6, NULL);
 621                 }
 622 #endif /* !TARGET_OS_EMBEDDED */
 623         }
 624
 625         if (h4_item != NULL)
 626         {
 627                 h4 = (struct hostent *)((uintptr_t)h4_item + sizeof(si_item_t));
 628         }
 629
 630         if (h6_item != NULL)
 631         {
 632                 h6 = (struct hostent *)((uintptr_t)h6_item + sizeof(si_item_t));
 633         }
 634
 635         out = si_addrinfo_list_from_hostent(si, socktype, proto, port, 0, h4, h6);
 636         si_item_release(h4_item);
 637         si_item_release(h6_item);
 638
 639         return out;
 640 }
 641
 642 __private_extern__ si_list_t *
 643 si_srv_byname(si_mod_t *si, const char *qname, uint32_t *err)
 644 {
 645         if (si == NULL) return 0;
 646         if (si->sim_srv_byname == NULL) return 0;
 647
 648         return si->sim_srv_byname(si, qname, err);
 649 }
 650
 651 __private_extern__ int
 652 si_wants_addrinfo(si_mod_t *si)
 653 {
 654         if (si == NULL) return 0;
 655         if (si->sim_addrinfo == NULL) return 0;
 656         if (si->sim_wants_addrinfo == NULL) return 0;
 657
 658         return si->sim_wants_addrinfo(si);
 659 }
 660
 661 static si_list_t *
 662 _gai_srv(si_mod_t *si, const char *node, const char *serv, uint32_t family, uint32_t socktype, uint32_t proto, uint32_t flags, uint32_t *err)
 663 {
 664         int i;
 665         char *qname;
 666         si_srv_t *srv;
 667         si_item_t *item;
 668
 669         si_list_t *list = NULL;
 670         si_list_t *result = NULL;
 671
 672         /* Minimum SRV priority is zero. Start below that. */
 673         int lastprio = -1;
 674         int currprio;
 675
 676         if (node == NULL || serv == NULL) return NULL;
 677
 678         asprintf(&qname, "%s.%s", serv, node);
 679         list = si_srv_byname(si, qname, err);
 680         free(qname);
 681
 682         /* Iterate the SRV records starting at lowest priority and attempt to
 683          * lookup the target host name. Returns the first successful lookup.
 684          * It's an O(n^2) algorithm but data sets are small (less than 100) and
 685          * sorting overhead is dwarfed by network I/O for each element.
 686          */
 687         while (list != NULL && result == NULL)
 688         {
 689                 /* Find the next lowest priority level. */
 690                 /* Maximum SRV priority is UINT16_MAX. Start above that. */
 691                 currprio = INT_MAX;
 692
 693                 for (i = 0; i < list->count; ++i)
 694                 {
 695                         item = list->entry[i];
 696                         srv = (si_srv_t *)((uintptr_t)item + sizeof(si_item_t));
 697
 698                         if (srv->priority > lastprio && srv->priority < currprio)
 699                         {
 700                                 currprio = srv->priority;
 701                         }
 702                 }
 703
 704                 if (currprio == INT_MAX)
 705                 {
 706                         /* All priorities have been evaluated. Done. */
 707                         break;
 708                 }
 709                 else
 710                 {
 711                         lastprio = currprio;
 712                 }
 713
 714                 /* Lookup hosts at the current priority level. Return first match. */
 715                 for (i = 0; i < list->count; ++i)
 716                 {
 717                         item = list->entry[i];
 718                         srv = (si_srv_t *)((uintptr_t)item + sizeof(si_item_t));
 719
 720                         if (srv->priority == currprio)
 721                         {
 722                                 /* So that _gai_simple expects an integer service. */
 723                                 flags |= AI_NUMERICSERV;
 724
 725                                 result = _gai_simple(si, srv->target, &srv->port, family, socktype, proto, flags, err);
 726                                 if (result)
 727                                 {
 728                                         break;
 729                                 }
 730                         }
 731                 }
 732         }
 733
 734         if (list != NULL)
 735         {
 736                 si_list_release(list);
 737         }
 738
 739         return result;
 740 }
 741
 742 __private_extern__ si_list_t *
 743 si_addrinfo(si_mod_t *si, const char *node, const char *serv, uint32_t family, uint32_t socktype, uint32_t proto, uint32_t flags, uint32_t *err)
 744 {
 745         int numerichost, numericserv = 0;
 746         const void *nodeptr = NULL, *servptr = NULL;
 747         uint16_t port;
 748         struct in_addr a4, *p4;
 749         struct in6_addr a6, *p6;
 750         const char *cname;
 751
 752         if (err != NULL) *err = SI_STATUS_NO_ERROR;
 753
 754         if (si == NULL)
 755         {
 756                 if (err != NULL) *err = SI_STATUS_EAI_FAIL;
 757                 return NULL;
 758         }
 759
 760         /* treat empty strings as NULL */
 761         if ((node != NULL) && (node[0] == '\0')) node = NULL;
 762         if ((serv != NULL) && (serv[0] == '\0')) serv = NULL;
 763
 764         /* make sure we have a query */
 765         if ((node == NULL) && (serv == NULL))
 766         {
 767                 if (err != NULL) *err = SI_STATUS_EAI_NONAME;
 768                 return NULL;
 769         }
 770
 771         /* verify family is supported */
 772         switch (family)
 773         {
 774                 case AF_UNSPEC:
 775 #if TARGET_OS_EMBEDDED
 776                         family = AF_INET;
 777 #endif
 778                 case AF_INET:
 779                 case AF_INET6:
 780                         break;
 781                 default:
 782                         if (err != NULL) *err = SI_STATUS_EAI_FAMILY;
 783                         return NULL;
 784         }
 785
 786         /* verify socket type is supported */
 787         switch (socktype)
 788         {
 789                 case SOCK_UNSPEC:
 790                 case SOCK_RAW:
 791                 case SOCK_DGRAM:
 792                 case SOCK_STREAM:
 793                         break;
 794                 default:
 795                         if (err != NULL) *err = SI_STATUS_EAI_BADHINTS;
 796                         return NULL;
 797         }
 798
 799         /* verify protocol is supported */
 800         switch (proto)
 801         {
 802                 case IPPROTO_UNSPEC:
 803                 case IPPROTO_UDP:
 804                 case IPPROTO_TCP:
 805                 case IPPROTO_ICMP:
 806                 case IPPROTO_ICMPV6:
 807                         break;
 808                 default:
 809                         if (err != NULL) *err = SI_STATUS_EAI_BADHINTS;
 810                         return NULL;
 811         }
 812
 813         /* verify socket type compatible with protocol */
 814         if (((socktype == SOCK_DGRAM) && (proto != IPPROTO_UNSPEC) && (proto != IPPROTO_UDP)) || ((socktype == SOCK_STREAM) && (proto != IPPROTO_UNSPEC) && (proto != IPPROTO_TCP)))
 815         {
 816                 if (err != NULL) *err = SI_STATUS_EAI_BADHINTS;
 817                 return NULL;
 818         }
 819
 820         memset(&a4, 0, sizeof(struct in_addr));
 821         memset(&a6, 0, sizeof(struct in6_addr));
 822
 823         /* determine the protocol if possible */
 824         if ((proto == IPPROTO_UNSPEC) && (socktype == SOCK_DGRAM)) proto = IPPROTO_UDP;
 825         if ((proto == IPPROTO_UNSPEC) && (socktype == SOCK_STREAM)) proto = IPPROTO_TCP;
 826
 827         port = 0;
 828
 829         if ((flags & AI_SRV) != 0)
 830         {
 831                 /* AI_SRV SPI */
 832                 return _gai_srv(si, node, serv, family, socktype, proto, flags, err);
 833         }
 834         else
 835         {
 836                 /* Usual service lookup */
 837                 numericserv = _gai_numericserv(serv, &port);
 838         }
 839
 840         if ((flags & AI_NUMERICSERV) && (numericserv == 0))
 841         {
 842                 /* FreeBSD returns SI_STATUS_EAI_SERVICE */
 843                 if (err != NULL) *err = SI_STATUS_EAI_NONAME;
 844                 return NULL;
 845         }
 846
 847         if (serv != NULL)
 848         {
 849                 if (numericserv == 1)
 850                 {
 851                         flags |= AI_NUMERICSERV;
 852                         servptr = &port;
 853                 }
 854                 else
 855                 {
 856                         servptr = serv;
 857                 }
 858         }
 859
 860         numerichost = _gai_numerichost(node, &family, flags, &a4, &a6);
 861         if ((numerichost == -1) || ((flags & AI_NUMERICHOST) && (numerichost == 0)))
 862         {
 863                 if (err != NULL) *err = SI_STATUS_EAI_NONAME;
 864                 return NULL;
 865         }
 866
 867         if (numerichost == 1)
 868         {
 869                 flags |= AI_NUMERICHOST;
 870                 if (family == AF_INET)
 871                 {
 872                         nodeptr = &a4;
 873                 }
 874                 else if (family == AF_INET6)
 875                 {
 876                         nodeptr = &a6;
 877                 }
 878         }
 879         else
 880         {
 881                 nodeptr = node;
 882         }
 883
 884         if ((numerichost == 1) && (numericserv == 0))
 885         {
 886                 /* only service lookup needed.  convert to port and perform a trivial getaddrinfo */
 887                 if (_gai_serv_to_port(serv, proto, &port) != 0)
 888                 {
 889                         if (err != NULL) *err = SI_STATUS_EAI_NONAME;
 890                         return NULL;
 891                 }
 892                 else
 893                 {
 894                         flags |= AI_NUMERICSERV;
 895                         servptr = &port;
 896                         numericserv = 1;
 897                 }
 898         }
 899
 900         if ((numerichost == 1) && (numericserv == 1))
 901         {
 902                 p4 = &a4;
 903                 p6 = &a6;
 904                 cname = NULL;
 905
 906                 if (family == AF_INET) p6 = NULL;
 907                 if (family == AF_INET6) p4 = NULL;
 908                 if (node == NULL) cname = "localhost";
 909
 910                 /* handle trivial questions */
 911                 return si_addrinfo_list(si, socktype, proto, p4, p6, port, 0, cname, cname);
 912         }
 913         else if ((si->sim_wants_addrinfo != NULL) && si->sim_wants_addrinfo(si))
 914         {
 915                 /* or let the current module handle the host lookups intelligently */
 916                 return si->sim_addrinfo(si, nodeptr, servptr, family, socktype, proto, flags, err);
 917         }
 918
 919         /* fall back to a default path */
 920         return _gai_simple(si, nodeptr, servptr, family, socktype, proto, flags, err);
 921 }
 922
 923 static struct addrinfo *
 924 si_item_to_addrinfo(si_item_t *item)
 925 {
 926         si_addrinfo_t *a;
 927         struct addrinfo *out;
 928
 929         if (item == NULL) return NULL;
 930
 931         a = (si_addrinfo_t *)((uintptr_t)item + sizeof(si_item_t));
 932
 933         out = (struct addrinfo *)calloc(1, sizeof(struct addrinfo));
 934         if (out == NULL) return NULL;
 935
 936         out->ai_flags = a->ai_flags;
 937         out->ai_family = a->ai_family;
 938         out->ai_socktype = a->ai_socktype;
 939         out->ai_protocol = a->ai_protocol;
 940         out->ai_addrlen = a->ai_addrlen;
 941
 942         out->ai_addr = (struct sockaddr *)calloc(1, out->ai_addrlen);
 943         if (out->ai_addr == NULL)
 944         {
 945                 free(out);
 946                 return NULL;
 947         }
 948
 949         memcpy(out->ai_addr, a->ai_addr.x, out->ai_addrlen);
 950
 951         if (a->ai_canonname != NULL)
 952         {
 953                 out->ai_canonname = strdup(a->ai_canonname);
 954                 if (out->ai_canonname == NULL)
 955                 {
 956                         free(out);
 957                         return NULL;
 958                 }
 959         }
 960
 961         return out;
 962 }
 963
 964 __private_extern__ struct addrinfo *
 965 si_list_to_addrinfo(si_list_t *list)
 966 {
 967         struct addrinfo *tail, *out;
 968         int i;
 969
 970         if (list == NULL) return NULL;
 971         if (list->count == 0) return NULL;
 972
 973         i = list->count - 1;
 974
 975         out = si_item_to_addrinfo(list->entry[i]);
 976         tail = out;
 977
 978         for (i--; i >= 0; i--)
 979         {
 980                 out = si_item_to_addrinfo(list->entry[i]);
 981                 if (out == NULL)
 982                 {
 983                         freeaddrinfo(tail);
 984                         return NULL;
 985                 }
 986
 987                 out->ai_next = tail;
 988                 tail = out;
 989         }
 990
 991         return out;
 992 }
 993
 994 /* getipnodebyname */
 995
 996 static si_item_t *
 997 make_hostent(si_mod_t *si, const char *name, struct in_addr addr)
 998 {
 999         char *addrs[2];
1000         char *aliases[1];
1001         uint64_t unused;
1002
1003         if (name == NULL) return NULL;
1004
1005         unused = 0;
1006
1007         addrs[0] = (char *)&(addr.s_addr);
1008         addrs[1] = NULL;
1009         aliases[0] = NULL;
1010
1011         return (si_item_t *)LI_ils_create("L4488s*44a", (unsigned long)si, CATEGORY_HOST_IPV4, 1, unused, unused, name, aliases, AF_INET, IPV4_ADDR_LEN, addrs);
1012 }
1013
1014 static si_item_t *
1015 make_hostent6(si_mod_t *si, const char *name, struct in6_addr addr)
1016 {
1017         char *addrs[2];
1018         char *aliases[1];
1019         uint64_t unused;
1020
1021         if (name == NULL) return NULL;
1022
1023         unused = 0;
1024
1025         addrs[0] = (char *)&(addr.__u6_addr.__u6_addr32[0]);
1026         addrs[1] = NULL;
1027         aliases[0] = NULL;
1028
1029         return (si_item_t *)LI_ils_create("L4488s*44c", (unsigned long)si, CATEGORY_HOST_IPV6, 1, unused, unused, name, aliases, AF_INET6, IPV6_ADDR_LEN, addrs);
1030 }
1031
1032 static char *
1033 lower_case(const char *s)
1034 {
1035         int i;
1036         char *t;
1037
1038         if (s == NULL) return NULL;
1039
1040         t = malloc(strlen(s) + 1);
1041
1042         for (i = 0; s[i] != '\0'; i++)
1043         {
1044                 if ((s[i] >= 'A') && (s[i] <= 'Z')) t[i] = s[i] + 32;
1045                 else t[i] = s[i];
1046         }
1047
1048         t[i] = '\0';
1049
1050         return t;
1051 }
1052
1053 static int
1054 merge_alias(const char *name, build_hostent_t *h)
1055 {
1056         int i;
1057
1058         if (name == NULL) return 0;
1059         if (h == NULL) return 0;
1060
1061         if ((h->host.h_name != NULL) && (string_equal(name, h->host.h_name))) return 0;
1062
1063         for (i = 0; i < h->alias_count; i++)
1064         {
1065                 if (string_equal(name, h->host.h_aliases[i])) return 0;
1066         }
1067
1068         if (h->alias_count == 0) h->host.h_aliases = (char **)calloc(2, sizeof(char *));
1069         else h->host.h_aliases = (char **)reallocf(h->host.h_aliases, (h->alias_count + 2) * sizeof(char *));
1070
1071         if (h->host.h_aliases == NULL)
1072         {
1073                 h->alias_count = 0;
1074                 return -1;
1075         }
1076
1077         h->host.h_aliases[h->alias_count] = lower_case(name);
1078         h->alias_count++;
1079         h->host.h_aliases[h->alias_count] = NULL;
1080
1081         return 0;
1082 }
1083
1084 static int
1085 append_addr(const char *addr, uint32_t len, build_hostent_t *h)
1086 {
1087         if (addr == NULL) return 0;
1088         if (h == NULL) return 0;
1089
1090         if (h->addr_count == 0) h->host.h_addr_list = (char **)calloc(2, sizeof(char *));
1091         else h->host.h_addr_list = (char **)reallocf(h->host.h_addr_list, (h->addr_count + 2) * sizeof(char *));
1092
1093         if (h->host.h_addr_list == NULL)
1094         {
1095                 h->addr_count = 0;
1096                 return -1;
1097         }
1098
1099         h->host.h_addr_list[h->addr_count] = malloc(len);
1100         if (h->host.h_addr_list[h->addr_count] == NULL) return -1;
1101
1102         memcpy(h->host.h_addr_list[h->addr_count], addr, len);
1103         h->addr_count++;
1104         h->host.h_addr_list[h->addr_count] = NULL;
1105
1106         return 0;
1107 }
1108
1109 static void
1110 free_build_hostent(build_hostent_t *h)
1111 {
1112         uint32_t i;
1113         char **aliases;
1114
1115         if (h == NULL) return;
1116
1117         if (h->host.h_name != NULL) free(h->host.h_name);
1118         h->host.h_name = NULL;
1119
1120         aliases = h->host.h_aliases;
1121         if (aliases != NULL)
1122         {
1123                 while (*aliases != NULL) free(*aliases++);
1124                 free(h->host.h_aliases);
1125         }
1126
1127         h->host.h_aliases = NULL;
1128
1129         if (h->host.h_addr_list != NULL)
1130         {
1131                 for (i = 0; h->host.h_addr_list[i] != NULL; i++) free(h->host.h_addr_list[i]);
1132                 free(h->host.h_addr_list);
1133         }
1134
1135         h->host.h_addr_list = NULL;
1136         free(h);
1137 }
1138
1139 __private_extern__ si_item_t *
1140 si_ipnode_byname(si_mod_t *si, const char *name, int family, int flags, uint32_t *err)
1141 {
1142         int i, status, want, if4, if6;
1143         struct ifaddrs *ifa, *ifap;
1144         struct in_addr addr4;
1145         struct in6_addr addr6;
1146         si_item_t *item4, *item6;
1147         build_hostent_t *out;
1148         struct hostent *h;
1149         uint64_t unused;
1150
1151         memset(&addr4, 0, sizeof(struct in_addr));
1152         memset(&addr6, 0, sizeof(struct in6_addr));
1153
1154         if (err != NULL) *err = 0;
1155
1156         if (family == AF_INET)
1157         {
1158                 status = inet_aton(name, &addr4);
1159                 if (status == 1)
1160                 {
1161                         /* create a host entry */
1162                         item4 = make_hostent(si, name, addr4);
1163                         if (item4 == NULL)
1164                         {
1165                                 if (err != NULL) *err = SI_STATUS_H_ERRNO_NO_RECOVERY;
1166                                 return NULL;
1167                         }
1168
1169                         return item4;
1170                 }
1171         }
1172         else if (family == AF_INET6)
1173         {
1174                 status = inet_pton(family, name, &addr6);
1175                 if (status == 1)
1176                 {
1177                         /* create a host entry */
1178                         item6 = make_hostent6(si, name, addr6);
1179                         if (item6 == NULL)
1180                         {
1181                                 if (err != NULL) *err = SI_STATUS_H_ERRNO_NO_RECOVERY;
1182                                 return NULL;
1183                         }
1184
1185                         return item6;
1186                 }
1187
1188                 status = inet_aton(name, &addr4);
1189                 if (status == 1)
1190                 {
1191                         if (!(flags & (AI_V4MAPPED | AI_V4MAPPED_CFG)))
1192                         {
1193                                 if (err != NULL) *err = SI_STATUS_H_ERRNO_HOST_NOT_FOUND;
1194                                 return NULL;
1195                         }
1196
1197                         addr6.__u6_addr.__u6_addr32[0] = 0x00000000;
1198                         addr6.__u6_addr.__u6_addr32[1] = 0x00000000;
1199                         addr6.__u6_addr.__u6_addr32[2] = htonl(0x0000ffff);
1200                         memmove(&(addr6.__u6_addr.__u6_addr32[3]), &(addr4.s_addr), IPV4_ADDR_LEN);
1201
1202                         /* create a host entry */
1203                         item6 = make_hostent6(si, name, addr6);
1204                         if (item6 == NULL)
1205                         {
1206                                 if (err != NULL) *err = SI_STATUS_H_ERRNO_NO_RECOVERY;
1207                                 return NULL;
1208                         }
1209
1210                         return item6;
1211                 }
1212         }
1213         else
1214         {
1215                 if (err != NULL) *err = SI_STATUS_H_ERRNO_NO_RECOVERY;
1216                 return NULL;
1217         }
1218
1219         /*
1220          * IF AI_ADDRCONFIG is set, we need to know what interface flavors we really have.
1221          */
1222
1223         if4 = 0;
1224         if6 = 0;
1225
1226         if (flags & AI_ADDRCONFIG)
1227         {
1228                 if (getifaddrs(&ifa) < 0)
1229                 {
1230                         if (err != NULL) *err = SI_STATUS_H_ERRNO_NO_RECOVERY;
1231                         return NULL;
1232                 }
1233
1234                 for (ifap = ifa; ifap != NULL; ifap = ifap->ifa_next)
1235                 {
1236                         if (ifap->ifa_addr == NULL) continue;
1237                         if ((ifap->ifa_flags & IFF_UP) == 0) continue;
1238                         if (ifap->ifa_addr->sa_family == AF_INET) if4++;
1239                         else if (ifap->ifa_addr->sa_family == AF_INET6) if6++;
1240                 }
1241
1242                 freeifaddrs(ifa);
1243
1244                 /* Bail out if there are no interfaces */
1245                 if ((if4 == 0) && (if6 == 0))
1246                 {
1247                         if (err != NULL) *err = SI_STATUS_H_ERRNO_NO_RECOVERY;
1248                         return NULL;
1249                 }
1250         }
1251
1252         /*
1253          * Figure out what we want.
1254          * If user asked for AF_INET, we only want V4 addresses.
1255          */
1256         want = WANT_A4_ONLY;
1257
1258         if (family == AF_INET)
1259         {
1260                 if ((flags & AI_ADDRCONFIG) && (if4 == 0))
1261                 {
1262                         if (err != NULL) *err = SI_STATUS_H_ERRNO_NO_RECOVERY;
1263                         return NULL;
1264                 }
1265         }
1266         else if (family == AF_INET6)
1267         {
1268                 /* family == AF_INET6 */
1269                 want = WANT_A6_ONLY;
1270
1271                 if (flags & (AI_V4MAPPED | AI_V4MAPPED_CFG))
1272                 {
1273                         if (flags & AI_ALL)
1274                         {
1275                                 want = WANT_A6_PLUS_MAPPED_A4;
1276                         }
1277                         else
1278                         {
1279                                 want = WANT_A6_OR_MAPPED_A4_IF_NO_A6;
1280                         }
1281                 }
1282                 else
1283                 {
1284                         if ((flags & AI_ADDRCONFIG) && (if6 == 0))
1285                         {
1286                                 if (err != NULL) *err = SI_STATUS_H_ERRNO_NO_RECOVERY;
1287                                 return NULL;
1288                         }
1289                 }
1290         }
1291         else
1292         {
1293                 if (err != NULL) *err = SI_STATUS_H_ERRNO_NO_RECOVERY;
1294                 return NULL;
1295         }
1296
1297         item6 = NULL;
1298         item4 = NULL;
1299
1300         /* fetch IPv6 data if required */
1301         if ((want == WANT_A6_ONLY) || (want == WANT_A6_OR_MAPPED_A4_IF_NO_A6) || (want == WANT_A6_PLUS_MAPPED_A4))
1302         {
1303                 item6 = si_host_byname(si, name, AF_INET6, (uint32_t *)err);
1304         }
1305
1306         /* fetch IPv4 data if required */
1307         if ((want == WANT_A4_ONLY) || (want == WANT_A6_PLUS_MAPPED_A4) || ((want == WANT_A6_OR_MAPPED_A4_IF_NO_A6) && (item6 == NULL)))
1308         {
1309                 item4 = si_host_byname(si, name, AF_INET, (uint32_t *)err);
1310         }
1311
1312         if (want == WANT_A4_ONLY)
1313         {
1314                 si_item_release(item6);
1315                 if ((item4 == NULL) && (err != NULL)) *err = SI_STATUS_H_ERRNO_HOST_NOT_FOUND;
1316                 return item4;
1317         }
1318
1319         if (want == WANT_A6_ONLY)
1320         {
1321                 si_item_release(item4);
1322                 if ((item6 == NULL) && (err != NULL)) *err = SI_STATUS_H_ERRNO_HOST_NOT_FOUND;
1323                 return item6;
1324         }
1325
1326         if ((item6 == NULL) && (item4 == NULL))
1327         {
1328                 if (err != NULL) *err = SI_STATUS_H_ERRNO_HOST_NOT_FOUND;
1329                 return NULL;
1330         }
1331
1332         /* output item will have IPv6 + mapped IPv4 addresses */
1333
1334         out = (build_hostent_t *)calloc(1, sizeof(build_hostent_t));
1335         if (out == NULL)
1336         {
1337                 si_item_release(item4);
1338                 si_item_release(item6);
1339                 if (err != NULL) *err = SI_STATUS_H_ERRNO_NO_RECOVERY;
1340                 return NULL;
1341         }
1342
1343         if (item4 != NULL)
1344         {
1345                 h = (struct hostent *)((uintptr_t)item4 + sizeof(si_item_t));
1346
1347                 out->host.h_name = lower_case(h->h_name);
1348
1349                 if (h->h_aliases != NULL)
1350                 {
1351                         for (i = 0; h->h_aliases[i] != NULL; i++) merge_alias(h->h_aliases[i], out);
1352                 }
1353
1354                 for (i = 0; h->h_addr_list[i] != 0; i++)
1355                 {
1356                         addr6.__u6_addr.__u6_addr32[0] = 0x00000000;
1357                         addr6.__u6_addr.__u6_addr32[1] = 0x00000000;
1358                         addr6.__u6_addr.__u6_addr32[2] = htonl(0x0000ffff);
1359                         memmove(&(addr6.__u6_addr.__u6_addr32[3]), h->h_addr_list[i], IPV4_ADDR_LEN);
1360                         append_addr((const char *)&addr6, IPV6_ADDR_LEN, out);
1361                 }
1362         }
1363
1364         if (item6 != NULL)
1365         {
1366                 h = (struct hostent *)((uintptr_t)item6 + sizeof(si_item_t));
1367
1368                 if (out->host.h_name == NULL) out->host.h_name = lower_case(h->h_name);
1369
1370                 if (h->h_aliases != NULL)
1371                 {
1372                         for (i = 0; h->h_aliases[i] != NULL; i++) merge_alias(h->h_aliases[i], out);
1373                 }
1374
1375                 for (i = 0; h->h_addr_list[i] != 0; i++) append_addr(h->h_addr_list[i], IPV6_ADDR_LEN, out);
1376         }
1377
1378         si_item_release(item4);
1379         si_item_release(item6);
1380
1381         unused = 0;
1382
1383         item6 = (si_item_t *)LI_ils_create("L4488s*44c", (unsigned long)si, CATEGORY_HOST_IPV6, 1, unused, unused, out->host.h_name, out->host.h_aliases, AF_INET6, IPV6_ADDR_LEN, out->host.h_addr_list);
1384
1385         free_build_hostent(out);
1386
1387         return item6;
1388 }