cups/http-addrlist.c

   1 /*
   2  * HTTP address list routines for CUPS.
   3  *
   4  * Copyright 2007-2014 by Apple Inc.
   5  * Copyright 1997-2007 by Easy Software Products, all rights reserved.
   6  *
   7  * These coded instructions, statements, and computer programs are the
   8  * property of Apple Inc. and are protected by Federal copyright
   9  * law.  Distribution and use rights are outlined in the file "LICENSE.txt"
  10  * which should have been included with this file.  If this file is
  11  * file is missing or damaged, see the license at "http://www.cups.org/".
  12  *
  13  * This file is subject to the Apple OS-Developed Software exception.
  14  */
  15
  16 /*
  17  * Include necessary headers...
  18  */
  19
  20 #include "cups-private.h"
  21 #ifdef HAVE_RESOLV_H
  22 #  include <resolv.h>
  23 #endif /* HAVE_RESOLV_H */
  24 #ifdef HAVE_POLL
  25 #  include <poll.h>
  26 #endif /* HAVE_POLL */
  27 #ifndef WIN32
  28 #  include <fcntl.h>
  29 #endif /* WIN32 */
  30
  31
  32 /*
  33  * 'httpAddrConnect()' - Connect to any of the addresses in the list.
  34  *
  35  * @since CUPS 1.2/OS X 10.5@
  36  */
  37
  38 http_addrlist_t *                       /* O - Connected address or NULL on failure */
  39 httpAddrConnect(
  40     http_addrlist_t *addrlist,          /* I - List of potential addresses */
  41     int             *sock)              /* O - Socket */
  42 {
  43   DEBUG_printf(("httpAddrConnect(addrlist=%p, sock=%p)", (void *)addrlist, (void *)sock));
  44
  45   return (httpAddrConnect2(addrlist, sock, 30000, NULL));
  46 }
  47
  48
  49 /*
  50  * 'httpAddrConnect2()' - Connect to any of the addresses in the list with a
  51  *                        timeout and optional cancel.
  52  *
  53  * @since CUPS 1.7/OS X 10.9@
  54  */
  55
  56 http_addrlist_t *                       /* O - Connected address or NULL on failure */
  57 httpAddrConnect2(
  58     http_addrlist_t *addrlist,          /* I - List of potential addresses */
  59     int             *sock,              /* O - Socket */
  60     int             msec,               /* I - Timeout in milliseconds */
  61     int             *cancel)            /* I - Pointer to "cancel" variable */
  62 {
  63   int                   val;            /* Socket option value */
  64 #ifdef O_NONBLOCK
  65   socklen_t             len;            /* Length of value */
  66   http_addr_t           peer;           /* Peer address */
  67   int                   flags,          /* Socket flags */
  68                         remaining;      /* Remaining timeout */
  69   int                   i,              /* Looping var */
  70                         nfds,           /* Number of file descriptors */
  71                         fds[100],       /* Socket file descriptors */
  72                         result;         /* Result from select() or poll() */
  73   http_addrlist_t       *addrs[100];    /* Addresses */
  74 #  ifdef HAVE_POLL
  75   struct pollfd         pfds[100];      /* Polled file descriptors */
  76 #  else
  77   int                   max_fd = -1;    /* Highest file descriptor */
  78   fd_set                input_set,      /* select() input set */
  79                         output_set;     /* select() output set */
  80   struct timeval        timeout;        /* Timeout */
  81 #  endif /* HAVE_POLL */
  82 #endif /* O_NONBLOCK */
  83 #ifdef DEBUG
  84   char                  temp[256];      /* Temporary address string */
  85 #endif /* DEBUG */
  86
  87
  88   DEBUG_printf(("httpAddrConnect2(addrlist=%p, sock=%p, msec=%d, cancel=%p)", (void *)addrlist, (void *)sock, msec, (void *)cancel));
  89
  90   if (!sock)
  91   {
  92     errno = EINVAL;
  93     _cupsSetError(IPP_STATUS_ERROR_INTERNAL, strerror(errno), 0);
  94     return (NULL);
  95   }
  96
  97   if (cancel && *cancel)
  98     return (NULL);
  99
 100   if (msec <= 0)
 101     msec = INT_MAX;
 102
 103  /*
 104   * Loop through each address until we connect or run out of addresses...
 105   */
 106
 107   for (nfds = 0; addrlist && nfds < (int)(sizeof(fds) / sizeof(fds[0])); addrlist = addrlist->next)
 108   {
 109     if (cancel && *cancel)
 110     {
 111       while (nfds > 0)
 112       {
 113         nfds --;
 114         httpAddrClose(NULL, fds[nfds]);
 115       }
 116
 117       return (NULL);
 118     }
 119
 120    /*
 121     * Create the socket...
 122     */
 123
 124     DEBUG_printf(("2httpAddrConnect2: Trying %s:%d...", httpAddrString(&(addrlist->addr), temp, sizeof(temp)), httpAddrPort(&(addrlist->addr))));
 125
 126     if ((fds[nfds] = (int)socket(httpAddrFamily(&(addrlist->addr)), SOCK_STREAM, 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       continue;
 134     }
 135
 136    /*
 137     * Set options...
 138     */
 139
 140     val = 1;
 141     setsockopt(fds[nfds], SOL_SOCKET, SO_REUSEADDR, CUPS_SOCAST &val, sizeof(val));
 142
 143 #ifdef SO_REUSEPORT
 144     val = 1;
 145     setsockopt(fds[nfds], SOL_SOCKET, SO_REUSEPORT, CUPS_SOCAST &val, sizeof(val));
 146 #endif /* SO_REUSEPORT */
 147
 148 #ifdef SO_NOSIGPIPE
 149     val = 1;
 150     setsockopt(fds[nfds], SOL_SOCKET, SO_NOSIGPIPE, CUPS_SOCAST &val, sizeof(val));
 151 #endif /* SO_NOSIGPIPE */
 152
 153    /*
 154     * Using TCP_NODELAY improves responsiveness, especially on systems
 155     * with a slow loopback interface...
 156     */
 157
 158     val = 1;
 159     setsockopt(fds[nfds], IPPROTO_TCP, TCP_NODELAY, CUPS_SOCAST &val, sizeof(val));
 160
 161 #ifdef FD_CLOEXEC
 162    /*
 163     * Close this socket when starting another process...
 164     */
 165
 166     fcntl(fds[nfds], F_SETFD, FD_CLOEXEC);
 167 #endif /* FD_CLOEXEC */
 168
 169 #ifdef O_NONBLOCK
 170    /*
 171     * Do an asynchronous connect by setting the socket non-blocking...
 172     */
 173
 174     DEBUG_printf(("httpAddrConnect2: Setting non-blocking connect()"));
 175
 176     flags = fcntl(fds[nfds], F_GETFL, 0);
 177     fcntl(fds[nfds], F_SETFL, flags | O_NONBLOCK);
 178 #endif /* O_NONBLOCK */
 179
 180    /*
 181     * Then connect...
 182     */
 183
 184     if (!connect(fds[nfds], &(addrlist->addr.addr), (socklen_t)httpAddrLength(&(addrlist->addr))))
 185     {
 186       DEBUG_printf(("1httpAddrConnect2: Connected to %s:%d...", httpAddrString(&(addrlist->addr), temp, sizeof(temp)), httpAddrPort(&(addrlist->addr))));
 187
 188 #ifdef O_NONBLOCK
 189       fcntl(fds[nfds], F_SETFL, flags);
 190 #endif /* O_NONBLOCK */
 191
 192       *sock = fds[nfds];
 193
 194       while (nfds > 0)
 195       {
 196         nfds --;
 197         httpAddrClose(NULL, fds[nfds]);
 198       }
 199
 200       return (addrlist);
 201     }
 202
 203 #ifdef WIN32
 204     if (WSAGetLastError() != WSAEINPROGRESS && WSAGetLastError() != WSAEWOULDBLOCK)
 205 #else
 206     if (errno != EINPROGRESS && errno != EWOULDBLOCK)
 207 #endif /* WIN32 */
 208     {
 209       DEBUG_printf(("1httpAddrConnect2: Unable to connect to %s:%d: %s", httpAddrString(&(addrlist->addr), temp, sizeof(temp)), httpAddrPort(&(addrlist->addr)), strerror(errno)));
 210       httpAddrClose(NULL, fds[nfds]);
 211       continue;
 212     }
 213
 214     fcntl(fds[nfds], F_SETFL, flags);
 215
 216 #ifndef HAVE_POLL
 217     if (fds[nfds] > max_fd)
 218       max_fd = fds[nfds];
 219 #endif /* !HAVE_POLL */
 220
 221     addrs[nfds] = addrlist;
 222     nfds ++;
 223   }
 224
 225 #ifdef O_NONBLOCK
 226   DEBUG_puts("1httpAddrConnect2: Finishing async connect()");
 227
 228   for (remaining = msec; remaining > 0; remaining -= 250)
 229   {
 230     do
 231     {
 232       if (cancel && *cancel)
 233       {
 234        /*
 235         * Close this socket and return...
 236         */
 237
 238         DEBUG_puts("1httpAddrConnect2: Canceled connect()");
 239
 240         while (nfds > 0)
 241         {
 242           nfds --;
 243           httpAddrClose(NULL, fds[nfds]);
 244         }
 245
 246         *sock = -1;
 247
 248         return (NULL);
 249       }
 250
 251 #  ifdef HAVE_POLL
 252       for (i = 0; i < nfds; i ++)
 253       {
 254         pfds[i].fd     = fds[i];
 255         pfds[i].events = POLLIN | POLLOUT;
 256       }
 257
 258       result = poll(pfds, (nfds_t)nfds, remaining > 250 ? 250 : remaining);
 259
 260       DEBUG_printf(("1httpAddrConnect2: poll() returned %d (%d)", result, errno));
 261
 262 #  else
 263       FD_ZERO(&input_set);
 264       for (i = 0; i < nfds; i ++)
 265         FD_SET(fds[i], &input_set);
 266       output_set = input_set;
 267
 268       timeout.tv_sec  = 0;
 269       timeout.tv_usec = (remaining > 250 ? 250 : remaining) * 1000;
 270
 271       result = select(max_fd + 1, &input_set, &output_set, NULL, &timeout);
 272
 273       DEBUG_printf(("1httpAddrConnect2: select() returned %d (%d)", result, errno));
 274 #  endif /* HAVE_POLL */
 275     }
 276 #  ifdef WIN32
 277     while (result < 0 && (WSAGetLastError() == WSAEINTR || WSAGetLastError() == WSAEWOULDBLOCK));
 278 #  else
 279     while (result < 0 && (errno == EINTR || errno == EAGAIN));
 280 #  endif /* WIN32 */
 281
 282     if (result > 0)
 283     {
 284       for (i = 0; i < nfds; i ++)
 285       {
 286 #  ifdef HAVE_POLL
 287         DEBUG_printf(("pfds[%d].revents=%x\n", i, pfds[i].revents));
 288         if (pfds[i].revents)
 289 #  else
 290         if (FD_ISSET(fds[i], &input))
 291 #  endif /* HAVE_POLL */
 292         {
 293           *sock = fds[i];
 294           len   = sizeof(peer);
 295           if (!getpeername(fds[i], (struct sockaddr *)&peer, &len))
 296           {
 297             DEBUG_printf(("1httpAddrConnect2: Connected to %s:%d...", httpAddrString(&peer, temp, sizeof(temp)), httpAddrPort(&peer)));
 298
 299             addrlist = addrs[i];
 300           }
 301         }
 302         else
 303           httpAddrClose(NULL, fds[i]);
 304       }
 305
 306       return (addrlist);
 307     }
 308   }
 309 #endif /* O_NONBLOCK */
 310
 311   while (nfds > 0)
 312   {
 313     nfds --;
 314     httpAddrClose(NULL, fds[nfds]);
 315   }
 316
 317 #ifdef WIN32
 318   _cupsSetError(IPP_STATUS_ERROR_SERVICE_UNAVAILABLE, "Connection failed", 0);
 319 #else
 320   _cupsSetError(IPP_STATUS_ERROR_SERVICE_UNAVAILABLE, strerror(errno), 0);
 321 #endif /* WIN32 */
 322
 323   return (NULL);
 324 }
 325
 326
 327 /*
 328  * 'httpAddrCopyList()' - Copy an address list.
 329  *
 330  * @since CUPS 1.7/OS X 10.9@
 331  */
 332
 333 http_addrlist_t *                       /* O - New address list or @code NULL@ on error */
 334 httpAddrCopyList(
 335     http_addrlist_t *src)               /* I - Source address list */
 336 {
 337   http_addrlist_t       *dst = NULL,    /* First list entry */
 338                         *prev = NULL,   /* Previous list entry */
 339                         *current = NULL;/* Current list entry */
 340
 341
 342   while (src)
 343   {
 344     if ((current = malloc(sizeof(http_addrlist_t))) == NULL)
 345     {
 346       current = dst;
 347
 348       while (current)
 349       {
 350         prev    = current;
 351         current = current->next;
 352
 353         free(prev);
 354       }
 355
 356       return (NULL);
 357     }
 358
 359     memcpy(current, src, sizeof(http_addrlist_t));
 360
 361     current->next = NULL;
 362
 363     if (prev)
 364       prev->next = current;
 365     else
 366       dst = current;
 367
 368     prev = current;
 369     src  = src->next;
 370   }
 371
 372   return (dst);
 373 }
 374
 375
 376 /*
 377  * 'httpAddrFreeList()' - Free an address list.
 378  *
 379  * @since CUPS 1.2/OS X 10.5@
 380  */
 381
 382 void
 383 httpAddrFreeList(
 384     http_addrlist_t *addrlist)          /* I - Address list to free */
 385 {
 386   http_addrlist_t       *next;          /* Next address in list */
 387
 388
 389  /*
 390   * Free each address in the list...
 391   */
 392
 393   while (addrlist)
 394   {
 395     next = addrlist->next;
 396
 397     free(addrlist);
 398
 399     addrlist = next;
 400   }
 401 }
 402
 403
 404 /*
 405  * 'httpAddrGetList()' - Get a list of addresses for a hostname.
 406  *
 407  * @since CUPS 1.2/OS X 10.5@
 408  */
 409
 410 http_addrlist_t *                       /* O - List of addresses or NULL */
 411 httpAddrGetList(const char *hostname,   /* I - Hostname, IP address, or NULL for passive listen address */
 412                 int        family,      /* I - Address family or AF_UNSPEC */
 413                 const char *service)    /* I - Service name or port number */
 414 {
 415   http_addrlist_t       *first,         /* First address in list */
 416                         *addr,          /* Current address in list */
 417                         *temp;          /* New address */
 418   _cups_globals_t       *cg = _cupsGlobals();
 419                                         /* Global data */
 420
 421
 422 #ifdef DEBUG
 423   _cups_debug_printf("httpAddrGetList(hostname=\"%s\", family=AF_%s, "
 424                      "service=\"%s\")\n",
 425                      hostname ? hostname : "(nil)",
 426                      family == AF_UNSPEC ? "UNSPEC" :
 427 #  ifdef AF_LOCAL
 428                          family == AF_LOCAL ? "LOCAL" :
 429 #  endif /* AF_LOCAL */
 430 #  ifdef AF_INET6
 431                          family == AF_INET6 ? "INET6" :
 432 #  endif /* AF_INET6 */
 433                          family == AF_INET ? "INET" : "???", service);
 434 #endif /* DEBUG */
 435
 436 #ifdef HAVE_RES_INIT
 437  /*
 438   * STR #2920: Initialize resolver after failure in cups-polld
 439   *
 440   * If the previous lookup failed, re-initialize the resolver to prevent
 441   * temporary network errors from persisting.  This *should* be handled by
 442   * the resolver libraries, but apparently the glibc folks do not agree.
 443   *
 444   * We set a flag at the end of this function if we encounter an error that
 445   * requires reinitialization of the resolver functions.  We then call
 446   * res_init() if the flag is set on the next call here or in httpAddrLookup().
 447   */
 448
 449   if (cg->need_res_init)
 450   {
 451     res_init();
 452
 453     cg->need_res_init = 0;
 454   }
 455 #endif /* HAVE_RES_INIT */
 456
 457  /*
 458   * Lookup the address the best way we can...
 459   */
 460
 461   first = addr = NULL;
 462
 463 #ifdef AF_LOCAL
 464   if (hostname && hostname[0] == '/')
 465   {
 466    /*
 467     * Domain socket address...
 468     */
 469
 470     if ((first = (http_addrlist_t *)calloc(1, sizeof(http_addrlist_t))) != NULL)
 471     {
 472       addr = first;
 473       first->addr.un.sun_family = AF_LOCAL;
 474       strlcpy(first->addr.un.sun_path, hostname, sizeof(first->addr.un.sun_path));
 475     }
 476   }
 477   else
 478 #endif /* AF_LOCAL */
 479   if (!hostname || _cups_strcasecmp(hostname, "localhost"))
 480   {
 481 #ifdef HAVE_GETADDRINFO
 482     struct addrinfo     hints,          /* Address lookup hints */
 483                         *results,       /* Address lookup results */
 484                         *current;       /* Current result */
 485     char                ipv6[64],       /* IPv6 address */
 486                         *ipv6zone;      /* Pointer to zone separator */
 487     int                 ipv6len;        /* Length of IPv6 address */
 488     int                 error;          /* getaddrinfo() error */
 489
 490
 491    /*
 492     * Lookup the address as needed...
 493     */
 494
 495     memset(&hints, 0, sizeof(hints));
 496     hints.ai_family   = family;
 497     hints.ai_flags    = hostname ? 0 : AI_PASSIVE;
 498     hints.ai_socktype = SOCK_STREAM;
 499
 500     if (hostname && *hostname == '[')
 501     {
 502      /*
 503       * Remove brackets from numeric IPv6 address...
 504       */
 505
 506       if (!strncmp(hostname, "[v1.", 4))
 507       {
 508        /*
 509         * Copy the newer address format which supports link-local addresses...
 510         */
 511
 512         strlcpy(ipv6, hostname + 4, sizeof(ipv6));
 513         if ((ipv6len = (int)strlen(ipv6) - 1) >= 0 && ipv6[ipv6len] == ']')
 514         {
 515           ipv6[ipv6len] = '\0';
 516           hostname      = ipv6;
 517
 518          /*
 519           * Convert "+zone" in address to "%zone"...
 520           */
 521
 522           if ((ipv6zone = strrchr(ipv6, '+')) != NULL)
 523             *ipv6zone = '%';
 524         }
 525       }
 526       else
 527       {
 528        /*
 529         * Copy the regular non-link-local IPv6 address...
 530         */
 531
 532         strlcpy(ipv6, hostname + 1, sizeof(ipv6));
 533         if ((ipv6len = (int)strlen(ipv6) - 1) >= 0 && ipv6[ipv6len] == ']')
 534         {
 535           ipv6[ipv6len] = '\0';
 536           hostname      = ipv6;
 537         }
 538       }
 539     }
 540
 541     if ((error = getaddrinfo(hostname, service, &hints, &results)) == 0)
 542     {
 543      /*
 544       * Copy the results to our own address list structure...
 545       */
 546
 547       for (current = results; current; current = current->ai_next)
 548         if (current->ai_family == AF_INET || current->ai_family == AF_INET6)
 549         {
 550          /*
 551           * Copy the address over...
 552           */
 553
 554           temp = (http_addrlist_t *)calloc(1, sizeof(http_addrlist_t));
 555           if (!temp)
 556           {
 557             httpAddrFreeList(first);
 558             _cupsSetError(IPP_STATUS_ERROR_INTERNAL, strerror(errno), 0);
 559             return (NULL);
 560           }
 561
 562           if (current->ai_family == AF_INET6)
 563             memcpy(&(temp->addr.ipv6), current->ai_addr,
 564                    sizeof(temp->addr.ipv6));
 565           else
 566             memcpy(&(temp->addr.ipv4), current->ai_addr,
 567                    sizeof(temp->addr.ipv4));
 568
 569          /*
 570           * Append the address to the list...
 571           */
 572
 573           if (!first)
 574             first = temp;
 575
 576           if (addr)
 577             addr->next = temp;
 578
 579           addr = temp;
 580         }
 581
 582      /*
 583       * Free the results from getaddrinfo()...
 584       */
 585
 586       freeaddrinfo(results);
 587     }
 588     else
 589     {
 590       if (error == EAI_FAIL)
 591         cg->need_res_init = 1;
 592
 593       _cupsSetError(IPP_STATUS_ERROR_INTERNAL, gai_strerror(error), 0);
 594     }
 595
 596 #else
 597     if (hostname)
 598     {
 599       int               i;              /* Looping vars */
 600       unsigned          ip[4];          /* IPv4 address components */
 601       const char        *ptr;           /* Pointer into hostname */
 602       struct hostent    *host;          /* Result of lookup */
 603       struct servent    *port;          /* Port number for service */
 604       int               portnum;        /* Port number */
 605
 606
 607      /*
 608       * Lookup the service...
 609       */
 610
 611       if (!service)
 612         portnum = 0;
 613       else if (isdigit(*service & 255))
 614         portnum = atoi(service);
 615       else if ((port = getservbyname(service, NULL)) != NULL)
 616         portnum = ntohs(port->s_port);
 617       else if (!strcmp(service, "http"))
 618         portnum = 80;
 619       else if (!strcmp(service, "https"))
 620         portnum = 443;
 621       else if (!strcmp(service, "ipp") || !strcmp(service, "ipps"))
 622         portnum = 631;
 623       else if (!strcmp(service, "lpd"))
 624         portnum = 515;
 625       else if (!strcmp(service, "socket"))
 626         portnum = 9100;
 627       else
 628         return (NULL);
 629
 630      /*
 631       * This code is needed because some operating systems have a
 632       * buggy implementation of gethostbyname() that does not support
 633       * IPv4 addresses.  If the hostname string is an IPv4 address, then
 634       * sscanf() is used to extract the IPv4 components.  We then pack
 635       * the components into an IPv4 address manually, since the
 636       * inet_aton() function is deprecated.  We use the htonl() macro
 637       * to get the right byte order for the address.
 638       */
 639
 640       for (ptr = hostname; isdigit(*ptr & 255) || *ptr == '.'; ptr ++);
 641
 642       if (!*ptr)
 643       {
 644        /*
 645         * We have an IPv4 address; break it up and create an IPv4 address...
 646         */
 647
 648         if (sscanf(hostname, "%u.%u.%u.%u", ip, ip + 1, ip + 2, ip + 3) == 4 &&
 649             ip[0] <= 255 && ip[1] <= 255 && ip[2] <= 255 && ip[3] <= 255)
 650         {
 651           first = (http_addrlist_t *)calloc(1, sizeof(http_addrlist_t));
 652           if (!first)
 653             return (NULL);
 654
 655           first->addr.ipv4.sin_family = AF_INET;
 656           first->addr.ipv4.sin_addr.s_addr = htonl((((((((unsigned)ip[0] << 8) |
 657                                                        (unsigned)ip[1]) << 8) |
 658                                                      (unsigned)ip[2]) << 8) |
 659                                                    (unsigned)ip[3]));
 660           first->addr.ipv4.sin_port = htons(portnum);
 661         }
 662       }
 663       else if ((host = gethostbyname(hostname)) != NULL &&
 664 #  ifdef AF_INET6
 665                (host->h_addrtype == AF_INET || host->h_addrtype == AF_INET6))
 666 #  else
 667                host->h_addrtype == AF_INET)
 668 #  endif /* AF_INET6 */
 669       {
 670         for (i = 0; host->h_addr_list[i]; i ++)
 671         {
 672          /*
 673           * Copy the address over...
 674           */
 675
 676           temp = (http_addrlist_t *)calloc(1, sizeof(http_addrlist_t));
 677           if (!temp)
 678           {
 679             httpAddrFreeList(first);
 680             return (NULL);
 681           }
 682
 683 #  ifdef AF_INET6
 684           if (host->h_addrtype == AF_INET6)
 685           {
 686             temp->addr.ipv6.sin6_family = AF_INET6;
 687             memcpy(&(temp->addr.ipv6.sin6_addr), host->h_addr_list[i],
 688                    sizeof(temp->addr.ipv6));
 689             temp->addr.ipv6.sin6_port = htons(portnum);
 690           }
 691           else
 692 #  endif /* AF_INET6 */
 693           {
 694             temp->addr.ipv4.sin_family = AF_INET;
 695             memcpy(&(temp->addr.ipv4.sin_addr), host->h_addr_list[i],
 696                    sizeof(temp->addr.ipv4));
 697             temp->addr.ipv4.sin_port = htons(portnum);
 698           }
 699
 700          /*
 701           * Append the address to the list...
 702           */
 703
 704           if (!first)
 705             first = temp;
 706
 707           if (addr)
 708             addr->next = temp;
 709
 710           addr = temp;
 711         }
 712       }
 713       else
 714       {
 715         if (h_errno == NO_RECOVERY)
 716           cg->need_res_init = 1;
 717
 718         _cupsSetError(IPP_STATUS_ERROR_INTERNAL, hstrerror(h_errno), 0);
 719       }
 720     }
 721 #endif /* HAVE_GETADDRINFO */
 722   }
 723
 724  /*
 725   * Detect some common errors and handle them sanely...
 726   */
 727
 728   if (!addr && (!hostname || !_cups_strcasecmp(hostname, "localhost")))
 729   {
 730     struct servent      *port;          /* Port number for service */
 731     int                 portnum;        /* Port number */
 732
 733
 734    /*
 735     * Lookup the service...
 736     */
 737
 738     if (!service)
 739       portnum = 0;
 740     else if (isdigit(*service & 255))
 741       portnum = atoi(service);
 742     else if ((port = getservbyname(service, NULL)) != NULL)
 743       portnum = ntohs(port->s_port);
 744     else if (!strcmp(service, "http"))
 745       portnum = 80;
 746     else if (!strcmp(service, "https"))
 747       portnum = 443;
 748     else if (!strcmp(service, "ipp") || !strcmp(service, "ipps"))
 749       portnum = 631;
 750     else if (!strcmp(service, "lpd"))
 751       portnum = 515;
 752     else if (!strcmp(service, "socket"))
 753       portnum = 9100;
 754     else
 755     {
 756       httpAddrFreeList(first);
 757
 758       _cupsSetError(IPP_STATUS_ERROR_INTERNAL, _("Unknown service name."), 1);
 759       return (NULL);
 760     }
 761
 762     if (hostname && !_cups_strcasecmp(hostname, "localhost"))
 763     {
 764      /*
 765       * Unfortunately, some users ignore all of the warnings in the
 766       * /etc/hosts file and delete "localhost" from it. If we get here
 767       * then we were unable to resolve the name, so use the IPv6 and/or
 768       * IPv4 loopback interface addresses...
 769       */
 770
 771 #ifdef AF_INET6
 772       if (family != AF_INET)
 773       {
 774        /*
 775         * Add [::1] to the address list...
 776         */
 777
 778         temp = (http_addrlist_t *)calloc(1, sizeof(http_addrlist_t));
 779         if (!temp)
 780         {
 781           _cupsSetError(IPP_STATUS_ERROR_INTERNAL, strerror(errno), 0);
 782           httpAddrFreeList(first);
 783           return (NULL);
 784         }
 785
 786         temp->addr.ipv6.sin6_family            = AF_INET6;
 787         temp->addr.ipv6.sin6_port              = htons(portnum);
 788 #  ifdef WIN32
 789         temp->addr.ipv6.sin6_addr.u.Byte[15]   = 1;
 790 #  else
 791         temp->addr.ipv6.sin6_addr.s6_addr32[3] = htonl(1);
 792 #  endif /* WIN32 */
 793
 794         if (!first)
 795           first = temp;
 796
 797         addr = temp;
 798       }
 799
 800       if (family != AF_INET6)
 801 #endif /* AF_INET6 */
 802       {
 803        /*
 804         * Add 127.0.0.1 to the address list...
 805         */
 806
 807         temp = (http_addrlist_t *)calloc(1, sizeof(http_addrlist_t));
 808         if (!temp)
 809         {
 810           _cupsSetError(IPP_STATUS_ERROR_INTERNAL, strerror(errno), 0);
 811           httpAddrFreeList(first);
 812           return (NULL);
 813         }
 814
 815         temp->addr.ipv4.sin_family      = AF_INET;
 816         temp->addr.ipv4.sin_port        = htons(portnum);
 817         temp->addr.ipv4.sin_addr.s_addr = htonl(0x7f000001);
 818
 819         if (!first)
 820           first = temp;
 821
 822         if (addr)
 823           addr->next = temp;
 824       }
 825     }
 826     else if (!hostname)
 827     {
 828      /*
 829       * Provide one or more passive listening addresses...
 830       */
 831
 832 #ifdef AF_INET6
 833       if (family != AF_INET)
 834       {
 835        /*
 836         * Add [::] to the address list...
 837         */
 838
 839         temp = (http_addrlist_t *)calloc(1, sizeof(http_addrlist_t));
 840         if (!temp)
 841         {
 842           _cupsSetError(IPP_STATUS_ERROR_INTERNAL, strerror(errno), 0);
 843           httpAddrFreeList(first);
 844           return (NULL);
 845         }
 846
 847         temp->addr.ipv6.sin6_family = AF_INET6;
 848         temp->addr.ipv6.sin6_port   = htons(portnum);
 849
 850         if (!first)
 851           first = temp;
 852
 853         addr = temp;
 854       }
 855
 856       if (family != AF_INET6)
 857 #endif /* AF_INET6 */
 858       {
 859        /*
 860         * Add 0.0.0.0 to the address list...
 861         */
 862
 863         temp = (http_addrlist_t *)calloc(1, sizeof(http_addrlist_t));
 864         if (!temp)
 865         {
 866           _cupsSetError(IPP_STATUS_ERROR_INTERNAL, strerror(errno), 0);
 867           httpAddrFreeList(first);
 868           return (NULL);
 869         }
 870
 871         temp->addr.ipv4.sin_family = AF_INET;
 872         temp->addr.ipv4.sin_port   = htons(portnum);
 873
 874         if (!first)
 875           first = temp;
 876
 877         if (addr)
 878           addr->next = temp;
 879       }
 880     }
 881   }
 882
 883  /*
 884   * Return the address list...
 885   */
 886
 887   return (first);
 888 }