cups/http-addrlist.c

   1 /*
   2  * "$Id$"
   3  *
   4  *   HTTP address list routines for CUPS.
   5  *
   6  *   Copyright 2007-2013 by Apple Inc.
   7  *   Copyright 1997-2007 by Easy Software Products, all rights reserved.
   8  *
   9  *   These coded instructions, statements, and computer programs are the
  10  *   property of Apple Inc. and are protected by Federal copyright
  11  *   law.  Distribution and use rights are outlined in the file "LICENSE.txt"
  12  *   which should have been included with this file.  If this file is
  13  *   file is missing or damaged, see the license at "http://www.cups.org/".
  14  *
  15  * Contents:
  16  *
  17  *   httpAddrConnect()  - Connect to any of the addresses in the list.
  18  *   httpAddrConnect2() - Connect to any of the addresses in the list with a
  19  *                        timeout and optional cancel.
  20  *   httpAddrCopyList() - Copy an address list.
  21  *   httpAddrFreeList() - Free an address list.
  22  *   httpAddrGetList()  - Get a list of addresses for a hostname.
  23  */
  24
  25 /*
  26  * Include necessary headers...
  27  */
  28
  29 #include "cups-private.h"
  30 #ifdef HAVE_RESOLV_H
  31 #  include <resolv.h>
  32 #endif /* HAVE_RESOLV_H */
  33 #ifdef HAVE_POLL
  34 #  include <poll.h>
  35 #endif /* HAVE_POLL */
  36 #ifndef WIN32
  37 #  include <fcntl.h>
  38 #endif /* WIN32 */
  39
  40
  41 /*
  42  * 'httpAddrConnect()' - Connect to any of the addresses in the list.
  43  *
  44  * @since CUPS 1.2/OS X 10.5@
  45  */
  46
  47 http_addrlist_t *                       /* O - Connected address or NULL on failure */
  48 httpAddrConnect(
  49     http_addrlist_t *addrlist,          /* I - List of potential addresses */
  50     int             *sock)              /* O - Socket */
  51 {
  52   DEBUG_printf(("httpAddrConnect(addrlist=%p, sock=%p)", addrlist, sock));
  53
  54   return (httpAddrConnect2(addrlist, sock, 30000, NULL));
  55 }
  56
  57
  58 /*
  59  * 'httpAddrConnect2()' - Connect to any of the addresses in the list with a
  60  *                        timeout and optional cancel.
  61  *
  62  * @since CUPS 1.7/OS X 10.9@
  63  */
  64
  65 http_addrlist_t *                       /* O - Connected address or NULL on failure */
  66 httpAddrConnect2(
  67     http_addrlist_t *addrlist,          /* I - List of potential addresses */
  68     int             *sock,              /* O - Socket */
  69     int             msec,               /* I - Timeout in milliseconds */
  70     int             *cancel)            /* I - Pointer to "cancel" variable */
  71 {
  72   int                   val;            /* Socket option value */
  73 #ifdef O_NONBLOCK
  74   socklen_t             len;            /* Length of value */
  75   http_addr_t           peer;           /* Peer address */
  76   int                   flags,          /* Socket flags */
  77                         remaining;      /* Remaining timeout */
  78 #  ifdef HAVE_POLL
  79   struct pollfd         pfd;            /* Polled file descriptor */
  80 #  else
  81   fd_set                input_set,      /* select() input set */
  82                         output_set;     /* select() output set */
  83   struct timeval        timeout;        /* Timeout */
  84 #  endif /* HAVE_POLL */
  85   int                   nfds;           /* Result from select()/poll() */
  86 #endif /* O_NONBLOCK */
  87 #ifdef DEBUG
  88   char                  temp[256];      /* Temporary address string */
  89 #endif /* DEBUG */
  90
  91
  92   DEBUG_printf(("httpAddrConnect2(addrlist=%p, sock=%p, msec=%d, cancel=%p)",
  93                 addrlist, sock, msec, cancel));
  94
  95   if (!sock)
  96   {
  97     errno = EINVAL;
  98     _cupsSetError(IPP_STATUS_ERROR_INTERNAL, strerror(errno), 0);
  99     return (NULL);
 100   }
 101
 102   if (cancel && *cancel)
 103     return (NULL);
 104
 105   if (msec <= 0 || getenv("CUPS_DISABLE_ASYNC_CONNECT"))
 106     msec = INT_MAX;
 107
 108  /*
 109   * Loop through each address until we connect or run out of addresses...
 110   */
 111
 112   while (addrlist)
 113   {
 114     if (cancel && *cancel)
 115       return (NULL);
 116
 117    /*
 118     * Create the socket...
 119     */
 120
 121     DEBUG_printf(("2httpAddrConnect2: Trying %s:%d...",
 122                   httpAddrString(&(addrlist->addr), temp, sizeof(temp)),
 123                   httpAddrPort(&(addrlist->addr))));
 124
 125     if ((*sock = (int)socket(_httpAddrFamily(&(addrlist->addr)), SOCK_STREAM,
 126                              0)) < 0)
 127     {
 128      /*
 129       * Don't abort yet, as this could just be an issue with the local
 130       * system not being configured with IPv4/IPv6/domain socket enabled...
 131       */
 132
 133       addrlist = addrlist->next;
 134       continue;
 135     }
 136
 137    /*
 138     * Set options...
 139     */
 140
 141     val = 1;
 142     setsockopt(*sock, SOL_SOCKET, SO_REUSEADDR, CUPS_SOCAST &val, sizeof(val));
 143
 144 #ifdef SO_REUSEPORT
 145     val = 1;
 146     setsockopt(*sock, SOL_SOCKET, SO_REUSEPORT, CUPS_SOCAST &val, sizeof(val));
 147 #endif /* SO_REUSEPORT */
 148
 149 #ifdef SO_NOSIGPIPE
 150     val = 1;
 151     setsockopt(*sock, SOL_SOCKET, SO_NOSIGPIPE, CUPS_SOCAST &val, sizeof(val));
 152 #endif /* SO_NOSIGPIPE */
 153
 154    /*
 155     * Using TCP_NODELAY improves responsiveness, especially on systems
 156     * with a slow loopback interface...
 157     */
 158
 159     val = 1;
 160     setsockopt(*sock, IPPROTO_TCP, TCP_NODELAY, CUPS_SOCAST &val, sizeof(val));
 161
 162 #ifdef FD_CLOEXEC
 163    /*
 164     * Close this socket when starting another process...
 165     */
 166
 167     fcntl(*sock, F_SETFD, FD_CLOEXEC);
 168 #endif /* FD_CLOEXEC */
 169
 170 #ifdef O_NONBLOCK
 171    /*
 172     * Do an asynchronous connect by setting the socket non-blocking...
 173     */
 174
 175     DEBUG_printf(("httpAddrConnect2: Setting non-blocking connect()"));
 176
 177     flags = fcntl(*sock, F_GETFL, 0);
 178     if (msec != INT_MAX)
 179     {
 180       DEBUG_puts("httpAddrConnect2: Setting non-blocking connect()");
 181
 182       fcntl(*sock, F_SETFL, flags | O_NONBLOCK);
 183     }
 184 #endif /* O_NONBLOCK */
 185
 186    /*
 187     * Then connect...
 188     */
 189
 190     if (!connect(*sock, &(addrlist->addr.addr),
 191                  httpAddrLength(&(addrlist->addr))))
 192     {
 193       DEBUG_printf(("1httpAddrConnect2: Connected to %s:%d...",
 194                     httpAddrString(&(addrlist->addr), temp, sizeof(temp)),
 195                     httpAddrPort(&(addrlist->addr))));
 196
 197 #ifdef O_NONBLOCK
 198       fcntl(*sock, F_SETFL, flags);
 199 #endif /* O_NONBLOCK */
 200
 201       return (addrlist);
 202     }
 203
 204 #ifdef O_NONBLOCK
 205 #  ifdef WIN32
 206     if (WSAGetLastError() == WSAEINPROGRESS ||
 207         WSAGetLastError() == WSAEWOULDBLOCK)
 208 #  else
 209     if (errno == EINPROGRESS || errno == EWOULDBLOCK)
 210 #  endif /* WIN32 */
 211     {
 212       DEBUG_puts("1httpAddrConnect2: Finishing async connect()");
 213
 214       fcntl(*sock, F_SETFL, flags);
 215
 216       for (remaining = msec; remaining > 0; remaining -= 250)
 217       {
 218         do
 219         {
 220           if (cancel && *cancel)
 221           {
 222            /*
 223             * Close this socket and return...
 224             */
 225
 226             DEBUG_puts("1httpAddrConnect2: Canceled connect()");
 227
 228 #    ifdef WIN32
 229             closesocket(*sock);
 230 #    else
 231             close(*sock);
 232 #    endif /* WIN32 */
 233
 234             *sock = -1;
 235
 236             return (NULL);
 237           }
 238
 239 #  ifdef HAVE_POLL
 240           pfd.fd     = *sock;
 241           pfd.events = POLLIN | POLLOUT;
 242
 243           nfds = poll(&pfd, 1, remaining > 250 ? 250 : remaining);
 244
 245           DEBUG_printf(("1httpAddrConnect2: poll() returned %d (%d)", nfds,
 246                         errno));
 247
 248 #  else
 249           FD_ZERO(&input_set);
 250           FD_SET(*sock, &input_set);
 251           output_set = input_set;
 252
 253           timeout.tv_sec  = 0;
 254           timeout.tv_usec = (remaining > 250 ? 250 : remaining) * 1000;
 255
 256           nfds = select(*sock + 1, &input_set, &output_set, NULL, &timeout);
 257
 258           DEBUG_printf(("1httpAddrConnect2: select() returned %d (%d)", nfds,
 259                         errno));
 260 #  endif /* HAVE_POLL */
 261         }
 262 #  ifdef WIN32
 263         while (nfds < 0 && (WSAGetLastError() == WSAEINTR ||
 264                             WSAGetLastError() == WSAEWOULDBLOCK));
 265 #  else
 266         while (nfds < 0 && (errno == EINTR || errno == EAGAIN));
 267 #  endif /* WIN32 */
 268
 269         if (nfds > 0)
 270         {
 271           len = sizeof(peer);
 272           if (!getpeername(*sock, (struct sockaddr *)&peer, &len))
 273           {
 274             DEBUG_printf(("1httpAddrConnect2: Connected to %s:%d...",
 275                           httpAddrString(&peer, temp, sizeof(temp)),
 276                           httpAddrPort(&peer)));
 277
 278             return (addrlist);
 279           }
 280
 281           break;
 282         }
 283       }
 284     }
 285 #endif /* O_NONBLOCK */
 286
 287     DEBUG_printf(("1httpAddrConnect2: Unable to connect to %s:%d: %s",
 288                   httpAddrString(&(addrlist->addr), temp, sizeof(temp)),
 289                   httpAddrPort(&(addrlist->addr)), strerror(errno)));
 290
 291 #ifndef WIN32
 292     if (errno == EINPROGRESS)
 293       errno = ETIMEDOUT;
 294 #endif /* !WIN32 */
 295
 296    /*
 297     * Close this socket and move to the next address...
 298     */
 299
 300 #ifdef WIN32
 301     closesocket(*sock);
 302 #else
 303     close(*sock);
 304 #endif /* WIN32 */
 305
 306     *sock    = -1;
 307     addrlist = addrlist->next;
 308   }
 309
 310   if (!addrlist)
 311 #ifdef WIN32
 312     _cupsSetError(IPP_STATUS_ERROR_SERVICE_UNAVAILABLE, "Connection failed", 0);
 313 #else
 314     _cupsSetError(IPP_STATUS_ERROR_SERVICE_UNAVAILABLE, strerror(errno), 0);
 315 #endif /* WIN32 */
 316
 317   return (addrlist);
 318 }
 319
 320
 321
 322 /*
 323  * 'httpAddrCopyList()' - Copy an address list.
 324  *
 325  * @since CUPS 1.7/OS X 10.9@
 326  */
 327
 328 http_addrlist_t *                       /* O - New address list or @code NULL@ on error */
 329 httpAddrCopyList(
 330     http_addrlist_t *src)               /* I - Source address list */
 331 {
 332   http_addrlist_t       *dst = NULL,    /* First list entry */
 333                         *prev = NULL,   /* Previous list entry */
 334                         *current = NULL;/* Current list entry */
 335
 336
 337   while (src)
 338   {
 339     if ((current = malloc(sizeof(http_addrlist_t))) == NULL)
 340     {
 341       current = dst;
 342
 343       while (current)
 344       {
 345         prev    = current;
 346         current = current->next;
 347
 348         free(prev);
 349       }
 350
 351       return (NULL);
 352     }
 353
 354     memcpy(current, src, sizeof(http_addrlist_t));
 355
 356     current->next = NULL;
 357
 358     if (prev)
 359       prev->next = current;
 360     else
 361       dst = current;
 362
 363     prev = current;
 364     src  = src->next;
 365   }
 366
 367   return (dst);
 368 }
 369
 370
 371 /*
 372  * 'httpAddrFreeList()' - Free an address list.
 373  *
 374  * @since CUPS 1.2/OS X 10.5@
 375  */
 376
 377 void
 378 httpAddrFreeList(
 379     http_addrlist_t *addrlist)          /* I - Address list to free */
 380 {
 381   http_addrlist_t       *next;          /* Next address in list */
 382
 383
 384  /*
 385   * Free each address in the list...
 386   */
 387
 388   while (addrlist)
 389   {
 390     next = addrlist->next;
 391
 392     free(addrlist);
 393
 394     addrlist = next;
 395   }
 396 }
 397
 398
 399 /*
 400  * 'httpAddrGetList()' - Get a list of addresses for a hostname.
 401  *
 402  * @since CUPS 1.2/OS X 10.5@
 403  */
 404
 405 http_addrlist_t *                       /* O - List of addresses or NULL */
 406 httpAddrGetList(const char *hostname,   /* I - Hostname, IP address, or NULL for passive listen address */
 407                 int        family,      /* I - Address family or AF_UNSPEC */
 408                 const char *service)    /* I - Service name or port number */
 409 {
 410   http_addrlist_t       *first,         /* First address in list */
 411                         *addr,          /* Current address in list */
 412                         *temp;          /* New address */
 413   _cups_globals_t       *cg = _cupsGlobals();
 414                                         /* Global data */
 415
 416
 417 #ifdef DEBUG
 418   _cups_debug_printf("httpAddrGetList(hostname=\"%s\", family=AF_%s, "
 419                      "service=\"%s\")\n",
 420                      hostname ? hostname : "(nil)",
 421                      family == AF_UNSPEC ? "UNSPEC" :
 422 #  ifdef AF_LOCAL
 423                          family == AF_LOCAL ? "LOCAL" :
 424 #  endif /* AF_LOCAL */
 425 #  ifdef AF_INET6
 426                          family == AF_INET6 ? "INET6" :
 427 #  endif /* AF_INET6 */
 428                          family == AF_INET ? "INET" : "???", service);
 429 #endif /* DEBUG */
 430
 431 #ifdef HAVE_RES_INIT
 432  /*
 433   * STR #2920: Initialize resolver after failure in cups-polld
 434   *
 435   * If the previous lookup failed, re-initialize the resolver to prevent
 436   * temporary network errors from persisting.  This *should* be handled by
 437   * the resolver libraries, but apparently the glibc folks do not agree.
 438   *
 439   * We set a flag at the end of this function if we encounter an error that
 440   * requires reinitialization of the resolver functions.  We then call
 441   * res_init() if the flag is set on the next call here or in httpAddrLookup().
 442   */
 443
 444   if (cg->need_res_init)
 445   {
 446     res_init();
 447
 448     cg->need_res_init = 0;
 449   }
 450 #endif /* HAVE_RES_INIT */
 451
 452  /*
 453   * Lookup the address the best way we can...
 454   */
 455
 456   first = addr = NULL;
 457
 458 #ifdef AF_LOCAL
 459   if (hostname && hostname[0] == '/')
 460   {
 461    /*
 462     * Domain socket address...
 463     */
 464
 465     if ((first = (http_addrlist_t *)calloc(1, sizeof(http_addrlist_t))) != NULL)
 466     {
 467       first->addr.un.sun_family = AF_LOCAL;
 468       strlcpy(first->addr.un.sun_path, hostname, sizeof(first->addr.un.sun_path));
 469     }
 470   }
 471   else
 472 #endif /* AF_LOCAL */
 473   if (!hostname || _cups_strcasecmp(hostname, "localhost"))
 474   {
 475 #ifdef HAVE_GETADDRINFO
 476     struct addrinfo     hints,          /* Address lookup hints */
 477                         *results,       /* Address lookup results */
 478                         *current;       /* Current result */
 479     char                ipv6[64],       /* IPv6 address */
 480                         *ipv6zone;      /* Pointer to zone separator */
 481     int                 ipv6len;        /* Length of IPv6 address */
 482     int                 error;          /* getaddrinfo() error */
 483
 484
 485    /*
 486     * Lookup the address as needed...
 487     */
 488
 489     memset(&hints, 0, sizeof(hints));
 490     hints.ai_family   = family;
 491     hints.ai_flags    = hostname ? 0 : AI_PASSIVE;
 492     hints.ai_socktype = SOCK_STREAM;
 493
 494     if (hostname && *hostname == '[')
 495     {
 496      /*
 497       * Remove brackets from numeric IPv6 address...
 498       */
 499
 500       if (!strncmp(hostname, "[v1.", 4))
 501       {
 502        /*
 503         * Copy the newer address format which supports link-local addresses...
 504         */
 505
 506         strlcpy(ipv6, hostname + 4, sizeof(ipv6));
 507         if ((ipv6len = (int)strlen(ipv6) - 1) >= 0 && ipv6[ipv6len] == ']')
 508         {
 509           ipv6[ipv6len] = '\0';
 510           hostname      = ipv6;
 511
 512          /*
 513           * Convert "+zone" in address to "%zone"...
 514           */
 515
 516           if ((ipv6zone = strrchr(ipv6, '+')) != NULL)
 517             *ipv6zone = '%';
 518         }
 519       }
 520       else
 521       {
 522        /*
 523         * Copy the regular non-link-local IPv6 address...
 524         */
 525
 526         strlcpy(ipv6, hostname + 1, sizeof(ipv6));
 527         if ((ipv6len = (int)strlen(ipv6) - 1) >= 0 && ipv6[ipv6len] == ']')
 528         {
 529           ipv6[ipv6len] = '\0';
 530           hostname      = ipv6;
 531         }
 532       }
 533     }
 534
 535     if ((error = getaddrinfo(hostname, service, &hints, &results)) == 0)
 536     {
 537      /*
 538       * Copy the results to our own address list structure...
 539       */
 540
 541       for (current = results; current; current = current->ai_next)
 542         if (current->ai_family == AF_INET || current->ai_family == AF_INET6)
 543         {
 544          /*
 545           * Copy the address over...
 546           */
 547
 548           temp = (http_addrlist_t *)calloc(1, sizeof(http_addrlist_t));
 549           if (!temp)
 550           {
 551             httpAddrFreeList(first);
 552             _cupsSetError(IPP_STATUS_ERROR_INTERNAL, strerror(errno), 0);
 553             return (NULL);
 554           }
 555
 556           if (current->ai_family == AF_INET6)
 557             memcpy(&(temp->addr.ipv6), current->ai_addr,
 558                    sizeof(temp->addr.ipv6));
 559           else
 560             memcpy(&(temp->addr.ipv4), current->ai_addr,
 561                    sizeof(temp->addr.ipv4));
 562
 563          /*
 564           * Append the address to the list...
 565           */
 566
 567           if (!first)
 568             first = temp;
 569
 570           if (addr)
 571             addr->next = temp;
 572
 573           addr = temp;
 574         }
 575
 576      /*
 577       * Free the results from getaddrinfo()...
 578       */
 579
 580       freeaddrinfo(results);
 581     }
 582     else
 583     {
 584       if (error == EAI_FAIL)
 585         cg->need_res_init = 1;
 586
 587       _cupsSetError(IPP_STATUS_ERROR_INTERNAL, gai_strerror(error), 0);
 588     }
 589
 590 #else
 591     if (hostname)
 592     {
 593       int               i;              /* Looping vars */
 594       unsigned          ip[4];          /* IPv4 address components */
 595       const char        *ptr;           /* Pointer into hostname */
 596       struct hostent    *host;          /* Result of lookup */
 597       struct servent    *port;          /* Port number for service */
 598       int               portnum;        /* Port number */
 599
 600
 601      /*
 602       * Lookup the service...
 603       */
 604
 605       if (!service)
 606         portnum = 0;
 607       else if (isdigit(*service & 255))
 608         portnum = atoi(service);
 609       else if ((port = getservbyname(service, NULL)) != NULL)
 610         portnum = ntohs(port->s_port);
 611       else if (!strcmp(service, "http"))
 612         portnum = 80;
 613       else if (!strcmp(service, "https"))
 614         portnum = 443;
 615       else if (!strcmp(service, "ipp") || !strcmp(service, "ipps"))
 616         portnum = 631;
 617       else if (!strcmp(service, "lpd"))
 618         portnum = 515;
 619       else if (!strcmp(service, "socket"))
 620         portnum = 9100;
 621       else
 622         return (NULL);
 623
 624      /*
 625       * This code is needed because some operating systems have a
 626       * buggy implementation of gethostbyname() that does not support
 627       * IPv4 addresses.  If the hostname string is an IPv4 address, then
 628       * sscanf() is used to extract the IPv4 components.  We then pack
 629       * the components into an IPv4 address manually, since the
 630       * inet_aton() function is deprecated.  We use the htonl() macro
 631       * to get the right byte order for the address.
 632       */
 633
 634       for (ptr = hostname; isdigit(*ptr & 255) || *ptr == '.'; ptr ++);
 635
 636       if (!*ptr)
 637       {
 638        /*
 639         * We have an IPv4 address; break it up and create an IPv4 address...
 640         */
 641
 642         if (sscanf(hostname, "%u.%u.%u.%u", ip, ip + 1, ip + 2, ip + 3) == 4 &&
 643             ip[0] <= 255 && ip[1] <= 255 && ip[2] <= 255 && ip[3] <= 255)
 644         {
 645           first = (http_addrlist_t *)calloc(1, sizeof(http_addrlist_t));
 646           if (!first)
 647             return (NULL);
 648
 649           first->addr.ipv4.sin_family = AF_INET;
 650           first->addr.ipv4.sin_addr.s_addr = htonl(((((((ip[0] << 8) |
 651                                                        ip[1]) << 8) |
 652                                                      ip[2]) << 8) | ip[3]));
 653           first->addr.ipv4.sin_port = htons(portnum);
 654         }
 655       }
 656       else if ((host = gethostbyname(hostname)) != NULL &&
 657 #  ifdef AF_INET6
 658                (host->h_addrtype == AF_INET || host->h_addrtype == AF_INET6))
 659 #  else
 660                host->h_addrtype == AF_INET)
 661 #  endif /* AF_INET6 */
 662       {
 663         for (i = 0; host->h_addr_list[i]; i ++)
 664         {
 665          /*
 666           * Copy the address over...
 667           */
 668
 669           temp = (http_addrlist_t *)calloc(1, sizeof(http_addrlist_t));
 670           if (!temp)
 671           {
 672             httpAddrFreeList(first);
 673             return (NULL);
 674           }
 675
 676 #  ifdef AF_INET6
 677           if (host->h_addrtype == AF_INET6)
 678           {
 679             temp->addr.ipv6.sin6_family = AF_INET6;
 680             memcpy(&(temp->addr.ipv6.sin6_addr), host->h_addr_list[i],
 681                    sizeof(temp->addr.ipv6));
 682             temp->addr.ipv6.sin6_port = htons(portnum);
 683           }
 684           else
 685 #  endif /* AF_INET6 */
 686           {
 687             temp->addr.ipv4.sin_family = AF_INET;
 688             memcpy(&(temp->addr.ipv4.sin_addr), host->h_addr_list[i],
 689                    sizeof(temp->addr.ipv4));
 690             temp->addr.ipv4.sin_port = htons(portnum);
 691           }
 692
 693          /*
 694           * Append the address to the list...
 695           */
 696
 697           if (!first)
 698             first = temp;
 699
 700           if (addr)
 701             addr->next = temp;
 702
 703           addr = temp;
 704         }
 705       }
 706       else
 707       {
 708         if (h_errno == NO_RECOVERY)
 709           cg->need_res_init = 1;
 710
 711         _cupsSetError(IPP_STATUS_ERROR_INTERNAL, hstrerror(h_errno), 0);
 712       }
 713     }
 714 #endif /* HAVE_GETADDRINFO */
 715   }
 716
 717  /*
 718   * Detect some common errors and handle them sanely...
 719   */
 720
 721   if (!addr && (!hostname || !_cups_strcasecmp(hostname, "localhost")))
 722   {
 723     struct servent      *port;          /* Port number for service */
 724     int                 portnum;        /* Port number */
 725
 726
 727    /*
 728     * Lookup the service...
 729     */
 730
 731     if (!service)
 732       portnum = 0;
 733     else if (isdigit(*service & 255))
 734       portnum = atoi(service);
 735     else if ((port = getservbyname(service, NULL)) != NULL)
 736       portnum = ntohs(port->s_port);
 737     else if (!strcmp(service, "http"))
 738       portnum = 80;
 739     else if (!strcmp(service, "https"))
 740       portnum = 443;
 741     else if (!strcmp(service, "ipp") || !strcmp(service, "ipps"))
 742       portnum = 631;
 743     else if (!strcmp(service, "lpd"))
 744       portnum = 515;
 745     else if (!strcmp(service, "socket"))
 746       portnum = 9100;
 747     else
 748     {
 749       httpAddrFreeList(first);
 750
 751       _cupsSetError(IPP_STATUS_ERROR_INTERNAL, _("Unknown service name."), 1);
 752       return (NULL);
 753     }
 754
 755     if (hostname && !_cups_strcasecmp(hostname, "localhost"))
 756     {
 757      /*
 758       * Unfortunately, some users ignore all of the warnings in the
 759       * /etc/hosts file and delete "localhost" from it. If we get here
 760       * then we were unable to resolve the name, so use the IPv6 and/or
 761       * IPv4 loopback interface addresses...
 762       */
 763
 764 #ifdef AF_INET6
 765       if (family != AF_INET)
 766       {
 767        /*
 768         * Add [::1] to the address list...
 769         */
 770
 771         temp = (http_addrlist_t *)calloc(1, sizeof(http_addrlist_t));
 772         if (!temp)
 773         {
 774           _cupsSetError(IPP_STATUS_ERROR_INTERNAL, strerror(errno), 0);
 775           httpAddrFreeList(first);
 776           return (NULL);
 777         }
 778
 779         temp->addr.ipv6.sin6_family            = AF_INET6;
 780         temp->addr.ipv6.sin6_port              = htons(portnum);
 781 #  ifdef WIN32
 782         temp->addr.ipv6.sin6_addr.u.Byte[15]   = 1;
 783 #  else
 784         temp->addr.ipv6.sin6_addr.s6_addr32[3] = htonl(1);
 785 #  endif /* WIN32 */
 786
 787         if (!first)
 788           first = temp;
 789
 790         addr = temp;
 791       }
 792
 793       if (family != AF_INET6)
 794 #endif /* AF_INET6 */
 795       {
 796        /*
 797         * Add 127.0.0.1 to the address list...
 798         */
 799
 800         temp = (http_addrlist_t *)calloc(1, sizeof(http_addrlist_t));
 801         if (!temp)
 802         {
 803           _cupsSetError(IPP_STATUS_ERROR_INTERNAL, strerror(errno), 0);
 804           httpAddrFreeList(first);
 805           return (NULL);
 806         }
 807
 808         temp->addr.ipv4.sin_family      = AF_INET;
 809         temp->addr.ipv4.sin_port        = htons(portnum);
 810         temp->addr.ipv4.sin_addr.s_addr = htonl(0x7f000001);
 811
 812         if (!first)
 813           first = temp;
 814
 815         if (addr)
 816           addr->next = temp;
 817       }
 818     }
 819     else if (!hostname)
 820     {
 821      /*
 822       * Provide one or more passive listening addresses...
 823       */
 824
 825 #ifdef AF_INET6
 826       if (family != AF_INET)
 827       {
 828        /*
 829         * Add [::] to the address list...
 830         */
 831
 832         temp = (http_addrlist_t *)calloc(1, sizeof(http_addrlist_t));
 833         if (!temp)
 834         {
 835           _cupsSetError(IPP_STATUS_ERROR_INTERNAL, strerror(errno), 0);
 836           httpAddrFreeList(first);
 837           return (NULL);
 838         }
 839
 840         temp->addr.ipv6.sin6_family = AF_INET6;
 841         temp->addr.ipv6.sin6_port   = htons(portnum);
 842
 843         if (!first)
 844           first = temp;
 845
 846         addr = temp;
 847       }
 848
 849       if (family != AF_INET6)
 850 #endif /* AF_INET6 */
 851       {
 852        /*
 853         * Add 0.0.0.0 to the address list...
 854         */
 855
 856         temp = (http_addrlist_t *)calloc(1, sizeof(http_addrlist_t));
 857         if (!temp)
 858         {
 859           _cupsSetError(IPP_STATUS_ERROR_INTERNAL, strerror(errno), 0);
 860           httpAddrFreeList(first);
 861           return (NULL);
 862         }
 863
 864         temp->addr.ipv4.sin_family = AF_INET;
 865         temp->addr.ipv4.sin_port   = htons(portnum);
 866
 867         if (!first)
 868           first = temp;
 869
 870         if (addr)
 871           addr->next = temp;
 872       }
 873     }
 874   }
 875
 876  /*
 877   * Return the address list...
 878   */
 879
 880   return (first);
 881 }
 882
 883
 884 /*
 885  * End of "$Id$".
 886  */