cups/http-addrlist.c

   1 /*
   2  * "$Id$"
   3  *
   4  * HTTP address list routines for CUPS.
   5  *
   6  * Copyright 2007-2014 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  * This file is subject to the Apple OS-Developed Software exception.
  16  */
  17
  18 /*
  19  * Include necessary headers...
  20  */
  21
  22 #include "cups-private.h"
  23 #ifdef HAVE_RESOLV_H
  24 #  include <resolv.h>
  25 #endif /* HAVE_RESOLV_H */
  26 #ifdef HAVE_POLL
  27 #  include <poll.h>
  28 #endif /* HAVE_POLL */
  29 #ifndef WIN32
  30 #  include <fcntl.h>
  31 #endif /* WIN32 */
  32
  33
  34 /*
  35  * 'httpAddrConnect()' - Connect to any of the addresses in the list.
  36  *
  37  * @since CUPS 1.2/OS X 10.5@
  38  */
  39
  40 http_addrlist_t *                       /* O - Connected address or NULL on failure */
  41 httpAddrConnect(
  42     http_addrlist_t *addrlist,          /* I - List of potential addresses */
  43     int             *sock)              /* O - Socket */
  44 {
  45   DEBUG_printf(("httpAddrConnect(addrlist=%p, sock=%p)", addrlist, sock));
  46
  47   return (httpAddrConnect2(addrlist, sock, 30000, NULL));
  48 }
  49
  50
  51 /*
  52  * 'httpAddrConnect2()' - Connect to any of the addresses in the list with a
  53  *                        timeout and optional cancel.
  54  *
  55  * @since CUPS 1.7/OS X 10.9@
  56  */
  57
  58 http_addrlist_t *                       /* O - Connected address or NULL on failure */
  59 httpAddrConnect2(
  60     http_addrlist_t *addrlist,          /* I - List of potential addresses */
  61     int             *sock,              /* O - Socket */
  62     int             msec,               /* I - Timeout in milliseconds */
  63     int             *cancel)            /* I - Pointer to "cancel" variable */
  64 {
  65   int                   val;            /* Socket option value */
  66 #ifdef O_NONBLOCK
  67   socklen_t             len;            /* Length of value */
  68   http_addr_t           peer;           /* Peer address */
  69   int                   flags,          /* Socket flags */
  70                         remaining;      /* Remaining timeout */
  71   int                   i,              /* Looping var */
  72                         nfds,           /* Number of file descriptors */
  73                         fds[100],       /* Socket file descriptors */
  74                         result;         /* Result from select() or poll() */
  75   http_addrlist_t       *addrs[100];    /* Addresses */
  76 #  ifdef HAVE_POLL
  77   struct pollfd         pfds[100];      /* Polled file descriptors */
  78 #  else
  79   int                   max_fd = -1;    /* Highest file descriptor */
  80   fd_set                input_set,      /* select() input set */
  81                         output_set;     /* select() output set */
  82   struct timeval        timeout;        /* Timeout */
  83 #  endif /* HAVE_POLL */
  84 #endif /* O_NONBLOCK */
  85 #ifdef DEBUG
  86   char                  temp[256];      /* Temporary address string */
  87 #endif /* DEBUG */
  88
  89
  90   DEBUG_printf(("httpAddrConnect2(addrlist=%p, sock=%p, msec=%d, cancel=%p)",
  91                 addrlist, sock, msec, cancel));
  92
  93   if (!sock)
  94   {
  95     errno = EINVAL;
  96     _cupsSetError(IPP_STATUS_ERROR_INTERNAL, strerror(errno), 0);
  97     return (NULL);
  98   }
  99
 100   if (cancel && *cancel)
 101     return (NULL);
 102
 103   if (msec <= 0)
 104     msec = INT_MAX;
 105
 106  /*
 107   * Loop through each address until we connect or run out of addresses...
 108   */
 109
 110   for (nfds = 0; addrlist && nfds < (int)(sizeof(fds) / sizeof(fds[0])); addrlist = addrlist->next)
 111   {
 112     if (cancel && *cancel)
 113     {
 114       while (nfds > 0)
 115       {
 116         nfds --;
 117         httpAddrClose(NULL, fds[nfds]);
 118       }
 119
 120       return (NULL);
 121     }
 122
 123    /*
 124     * Create the socket...
 125     */
 126
 127     DEBUG_printf(("2httpAddrConnect2: Trying %s:%d...", httpAddrString(&(addrlist->addr), temp, sizeof(temp)), httpAddrPort(&(addrlist->addr))));
 128
 129     if ((fds[nfds] = (int)socket(httpAddrFamily(&(addrlist->addr)), SOCK_STREAM, 0)) < 0)
 130     {
 131      /*
 132       * Don't abort yet, as this could just be an issue with the local
 133       * system not being configured with IPv4/IPv6/domain socket enabled...
 134       */
 135
 136       continue;
 137     }
 138
 139    /*
 140     * Set options...
 141     */
 142
 143     val = 1;
 144     setsockopt(fds[nfds], SOL_SOCKET, SO_REUSEADDR, CUPS_SOCAST &val, sizeof(val));
 145
 146 #ifdef SO_REUSEPORT
 147     val = 1;
 148     setsockopt(fds[nfds], SOL_SOCKET, SO_REUSEPORT, CUPS_SOCAST &val, sizeof(val));
 149 #endif /* SO_REUSEPORT */
 150
 151 #ifdef SO_NOSIGPIPE
 152     val = 1;
 153     setsockopt(fds[nfds], SOL_SOCKET, SO_NOSIGPIPE, CUPS_SOCAST &val, sizeof(val));
 154 #endif /* SO_NOSIGPIPE */
 155
 156    /*
 157     * Using TCP_NODELAY improves responsiveness, especially on systems
 158     * with a slow loopback interface...
 159     */
 160
 161     val = 1;
 162     setsockopt(fds[nfds], IPPROTO_TCP, TCP_NODELAY, CUPS_SOCAST &val, sizeof(val));
 163
 164 #ifdef FD_CLOEXEC
 165    /*
 166     * Close this socket when starting another process...
 167     */
 168
 169     fcntl(fds[nfds], F_SETFD, FD_CLOEXEC);
 170 #endif /* FD_CLOEXEC */
 171
 172 #ifdef O_NONBLOCK
 173    /*
 174     * Do an asynchronous connect by setting the socket non-blocking...
 175     */
 176
 177     DEBUG_printf(("httpAddrConnect2: Setting non-blocking connect()"));
 178
 179     flags = fcntl(fds[nfds], F_GETFL, 0);
 180     fcntl(fds[nfds], F_SETFL, flags | O_NONBLOCK);
 181 #endif /* O_NONBLOCK */
 182
 183    /*
 184     * Then connect...
 185     */
 186
 187     if (!connect(fds[nfds], &(addrlist->addr.addr), (socklen_t)httpAddrLength(&(addrlist->addr))))
 188     {
 189       DEBUG_printf(("1httpAddrConnect2: Connected to %s:%d...", httpAddrString(&(addrlist->addr), temp, sizeof(temp)), httpAddrPort(&(addrlist->addr))));
 190
 191 #ifdef O_NONBLOCK
 192       fcntl(fds[nfds], F_SETFL, flags);
 193 #endif /* O_NONBLOCK */
 194
 195       *sock = fds[nfds];
 196
 197       while (nfds > 0)
 198       {
 199         nfds --;
 200         httpAddrClose(NULL, fds[nfds]);
 201       }
 202
 203       return (addrlist);
 204     }
 205
 206 #ifdef WIN32
 207     if (WSAGetLastError() != WSAEINPROGRESS && WSAGetLastError() != WSAEWOULDBLOCK)
 208 #else
 209     if (errno != EINPROGRESS && errno != EWOULDBLOCK)
 210 #endif /* WIN32 */
 211     {
 212       DEBUG_printf(("1httpAddrConnect2: Unable to connect to %s:%d: %s", httpAddrString(&(addrlist->addr), temp, sizeof(temp)), httpAddrPort(&(addrlist->addr)), strerror(errno)));
 213       httpAddrClose(NULL, fds[nfds]);
 214       continue;
 215     }
 216
 217     fcntl(fds[nfds], F_SETFL, flags);
 218
 219 #ifndef HAVE_POLL
 220     if (fds[nfds] > max_fd)
 221       max_fd = fds[nfds];
 222 #endif /* !HAVE_POLL */
 223
 224     addrs[nfds] = addrlist;
 225     nfds ++;
 226   }
 227
 228 #ifdef O_NONBLOCK
 229   DEBUG_puts("1httpAddrConnect2: Finishing async connect()");
 230
 231   for (remaining = msec; remaining > 0; remaining -= 250)
 232   {
 233     do
 234     {
 235       if (cancel && *cancel)
 236       {
 237        /*
 238         * Close this socket and return...
 239         */
 240
 241         DEBUG_puts("1httpAddrConnect2: Canceled connect()");
 242
 243         while (nfds > 0)
 244         {
 245           nfds --;
 246           httpAddrClose(NULL, fds[nfds]);
 247         }
 248
 249         *sock = -1;
 250
 251         return (NULL);
 252       }
 253
 254 #  ifdef HAVE_POLL
 255       for (i = 0; i < nfds; i ++)
 256       {
 257         pfds[i].fd     = fds[i];
 258         pfds[i].events = POLLIN | POLLOUT;
 259       }
 260
 261       result = poll(pfds, (nfds_t)nfds, remaining > 250 ? 250 : remaining);
 262
 263       DEBUG_printf(("1httpAddrConnect2: poll() returned %d (%d)", result, errno));
 264
 265 #  else
 266       FD_ZERO(&input_set);
 267       for (i = 0; i < nfds; i ++)
 268         FD_SET(fds[i], &input_set);
 269       output_set = input_set;
 270
 271       timeout.tv_sec  = 0;
 272       timeout.tv_usec = (remaining > 250 ? 250 : remaining) * 1000;
 273
 274       result = select(max_fd + 1, &input_set, &output_set, NULL, &timeout);
 275
 276       DEBUG_printf(("1httpAddrConnect2: select() returned %d (%d)", result, errno));
 277 #  endif /* HAVE_POLL */
 278     }
 279 #  ifdef WIN32
 280     while (result < 0 && (WSAGetLastError() == WSAEINTR || WSAGetLastError() == WSAEWOULDBLOCK));
 281 #  else
 282     while (result < 0 && (errno == EINTR || errno == EAGAIN));
 283 #  endif /* WIN32 */
 284
 285     if (result > 0)
 286     {
 287       for (i = 0; i < nfds; i ++)
 288       {
 289 #  ifdef HAVE_POLL
 290         DEBUG_printf(("pfds[%d].revents=%x\n", i, pfds[i].revents));
 291         if (pfds[i].revents)
 292 #  else
 293         if (FD_ISSET(fds[i], &input))
 294 #  endif /* HAVE_POLL */
 295         {
 296           *sock = fds[i];
 297           len   = sizeof(peer);
 298           if (!getpeername(fds[i], (struct sockaddr *)&peer, &len))
 299           {
 300             DEBUG_printf(("1httpAddrConnect2: Connected to %s:%d...", httpAddrString(&peer, temp, sizeof(temp)), httpAddrPort(&peer)));
 301
 302             addrlist = addrs[i];
 303           }
 304         }
 305         else
 306           httpAddrClose(NULL, fds[i]);
 307       }
 308
 309       return (addrlist);
 310     }
 311   }
 312 #endif /* O_NONBLOCK */
 313
 314   while (nfds > 0)
 315   {
 316     nfds --;
 317     httpAddrClose(NULL, fds[nfds]);
 318   }
 319
 320 #ifdef WIN32
 321   _cupsSetError(IPP_STATUS_ERROR_SERVICE_UNAVAILABLE, "Connection failed", 0);
 322 #else
 323   _cupsSetError(IPP_STATUS_ERROR_SERVICE_UNAVAILABLE, strerror(errno), 0);
 324 #endif /* WIN32 */
 325
 326   return (NULL);
 327 }
 328
 329
 330 /*
 331  * 'httpAddrCopyList()' - Copy an address list.
 332  *
 333  * @since CUPS 1.7/OS X 10.9@
 334  */
 335
 336 http_addrlist_t *                       /* O - New address list or @code NULL@ on error */
 337 httpAddrCopyList(
 338     http_addrlist_t *src)               /* I - Source address list */
 339 {
 340   http_addrlist_t       *dst = NULL,    /* First list entry */
 341                         *prev = NULL,   /* Previous list entry */
 342                         *current = NULL;/* Current list entry */
 343
 344
 345   while (src)
 346   {
 347     if ((current = malloc(sizeof(http_addrlist_t))) == NULL)
 348     {
 349       current = dst;
 350
 351       while (current)
 352       {
 353         prev    = current;
 354         current = current->next;
 355
 356         free(prev);
 357       }
 358
 359       return (NULL);
 360     }
 361
 362     memcpy(current, src, sizeof(http_addrlist_t));
 363
 364     current->next = NULL;
 365
 366     if (prev)
 367       prev->next = current;
 368     else
 369       dst = current;
 370
 371     prev = current;
 372     src  = src->next;
 373   }
 374
 375   return (dst);
 376 }
 377
 378
 379 /*
 380  * 'httpAddrFreeList()' - Free an address list.
 381  *
 382  * @since CUPS 1.2/OS X 10.5@
 383  */
 384
 385 void
 386 httpAddrFreeList(
 387     http_addrlist_t *addrlist)          /* I - Address list to free */
 388 {
 389   http_addrlist_t       *next;          /* Next address in list */
 390
 391
 392  /*
 393   * Free each address in the list...
 394   */
 395
 396   while (addrlist)
 397   {
 398     next = addrlist->next;
 399
 400     free(addrlist);
 401
 402     addrlist = next;
 403   }
 404 }
 405
 406
 407 /*
 408  * 'httpAddrGetList()' - Get a list of addresses for a hostname.
 409  *
 410  * @since CUPS 1.2/OS X 10.5@
 411  */
 412
 413 http_addrlist_t *                       /* O - List of addresses or NULL */
 414 httpAddrGetList(const char *hostname,   /* I - Hostname, IP address, or NULL for passive listen address */
 415                 int        family,      /* I - Address family or AF_UNSPEC */
 416                 const char *service)    /* I - Service name or port number */
 417 {
 418   http_addrlist_t       *first,         /* First address in list */
 419                         *addr,          /* Current address in list */
 420                         *temp;          /* New address */
 421   _cups_globals_t       *cg = _cupsGlobals();
 422                                         /* Global data */
 423
 424
 425 #ifdef DEBUG
 426   _cups_debug_printf("httpAddrGetList(hostname=\"%s\", family=AF_%s, "
 427                      "service=\"%s\")\n",
 428                      hostname ? hostname : "(nil)",
 429                      family == AF_UNSPEC ? "UNSPEC" :
 430 #  ifdef AF_LOCAL
 431                          family == AF_LOCAL ? "LOCAL" :
 432 #  endif /* AF_LOCAL */
 433 #  ifdef AF_INET6
 434                          family == AF_INET6 ? "INET6" :
 435 #  endif /* AF_INET6 */
 436                          family == AF_INET ? "INET" : "???", service);
 437 #endif /* DEBUG */
 438
 439 #ifdef HAVE_RES_INIT
 440  /*
 441   * STR #2920: Initialize resolver after failure in cups-polld
 442   *
 443   * If the previous lookup failed, re-initialize the resolver to prevent
 444   * temporary network errors from persisting.  This *should* be handled by
 445   * the resolver libraries, but apparently the glibc folks do not agree.
 446   *
 447   * We set a flag at the end of this function if we encounter an error that
 448   * requires reinitialization of the resolver functions.  We then call
 449   * res_init() if the flag is set on the next call here or in httpAddrLookup().
 450   */
 451
 452   if (cg->need_res_init)
 453   {
 454     res_init();
 455
 456     cg->need_res_init = 0;
 457   }
 458 #endif /* HAVE_RES_INIT */
 459
 460  /*
 461   * Lookup the address the best way we can...
 462   */
 463
 464   first = addr = NULL;
 465
 466 #ifdef AF_LOCAL
 467   if (hostname && hostname[0] == '/')
 468   {
 469    /*
 470     * Domain socket address...
 471     */
 472
 473     if ((first = (http_addrlist_t *)calloc(1, sizeof(http_addrlist_t))) != NULL)
 474     {
 475       addr = first;
 476       first->addr.un.sun_family = AF_LOCAL;
 477       strlcpy(first->addr.un.sun_path, hostname, sizeof(first->addr.un.sun_path));
 478     }
 479   }
 480   else
 481 #endif /* AF_LOCAL */
 482   if (!hostname || _cups_strcasecmp(hostname, "localhost"))
 483   {
 484 #ifdef HAVE_GETADDRINFO
 485     struct addrinfo     hints,          /* Address lookup hints */
 486                         *results,       /* Address lookup results */
 487                         *current;       /* Current result */
 488     char                ipv6[64],       /* IPv6 address */
 489                         *ipv6zone;      /* Pointer to zone separator */
 490     int                 ipv6len;        /* Length of IPv6 address */
 491     int                 error;          /* getaddrinfo() error */
 492
 493
 494    /*
 495     * Lookup the address as needed...
 496     */
 497
 498     memset(&hints, 0, sizeof(hints));
 499     hints.ai_family   = family;
 500     hints.ai_flags    = hostname ? 0 : AI_PASSIVE;
 501     hints.ai_socktype = SOCK_STREAM;
 502
 503     if (hostname && *hostname == '[')
 504     {
 505      /*
 506       * Remove brackets from numeric IPv6 address...
 507       */
 508
 509       if (!strncmp(hostname, "[v1.", 4))
 510       {
 511        /*
 512         * Copy the newer address format which supports link-local addresses...
 513         */
 514
 515         strlcpy(ipv6, hostname + 4, sizeof(ipv6));
 516         if ((ipv6len = (int)strlen(ipv6) - 1) >= 0 && ipv6[ipv6len] == ']')
 517         {
 518           ipv6[ipv6len] = '\0';
 519           hostname      = ipv6;
 520
 521          /*
 522           * Convert "+zone" in address to "%zone"...
 523           */
 524
 525           if ((ipv6zone = strrchr(ipv6, '+')) != NULL)
 526             *ipv6zone = '%';
 527         }
 528       }
 529       else
 530       {
 531        /*
 532         * Copy the regular non-link-local IPv6 address...
 533         */
 534
 535         strlcpy(ipv6, hostname + 1, sizeof(ipv6));
 536         if ((ipv6len = (int)strlen(ipv6) - 1) >= 0 && ipv6[ipv6len] == ']')
 537         {
 538           ipv6[ipv6len] = '\0';
 539           hostname      = ipv6;
 540         }
 541       }
 542     }
 543
 544     if ((error = getaddrinfo(hostname, service, &hints, &results)) == 0)
 545     {
 546      /*
 547       * Copy the results to our own address list structure...
 548       */
 549
 550       for (current = results; current; current = current->ai_next)
 551         if (current->ai_family == AF_INET || current->ai_family == AF_INET6)
 552         {
 553          /*
 554           * Copy the address over...
 555           */
 556
 557           temp = (http_addrlist_t *)calloc(1, sizeof(http_addrlist_t));
 558           if (!temp)
 559           {
 560             httpAddrFreeList(first);
 561             _cupsSetError(IPP_STATUS_ERROR_INTERNAL, strerror(errno), 0);
 562             return (NULL);
 563           }
 564
 565           if (current->ai_family == AF_INET6)
 566             memcpy(&(temp->addr.ipv6), current->ai_addr,
 567                    sizeof(temp->addr.ipv6));
 568           else
 569             memcpy(&(temp->addr.ipv4), current->ai_addr,
 570                    sizeof(temp->addr.ipv4));
 571
 572          /*
 573           * Append the address to the list...
 574           */
 575
 576           if (!first)
 577             first = temp;
 578
 579           if (addr)
 580             addr->next = temp;
 581
 582           addr = temp;
 583         }
 584
 585      /*
 586       * Free the results from getaddrinfo()...
 587       */
 588
 589       freeaddrinfo(results);
 590     }
 591     else
 592     {
 593       if (error == EAI_FAIL)
 594         cg->need_res_init = 1;
 595
 596       _cupsSetError(IPP_STATUS_ERROR_INTERNAL, gai_strerror(error), 0);
 597     }
 598
 599 #else
 600     if (hostname)
 601     {
 602       int               i;              /* Looping vars */
 603       unsigned          ip[4];          /* IPv4 address components */
 604       const char        *ptr;           /* Pointer into hostname */
 605       struct hostent    *host;          /* Result of lookup */
 606       struct servent    *port;          /* Port number for service */
 607       int               portnum;        /* Port number */
 608
 609
 610      /*
 611       * Lookup the service...
 612       */
 613
 614       if (!service)
 615         portnum = 0;
 616       else if (isdigit(*service & 255))
 617         portnum = atoi(service);
 618       else if ((port = getservbyname(service, NULL)) != NULL)
 619         portnum = ntohs(port->s_port);
 620       else if (!strcmp(service, "http"))
 621         portnum = 80;
 622       else if (!strcmp(service, "https"))
 623         portnum = 443;
 624       else if (!strcmp(service, "ipp") || !strcmp(service, "ipps"))
 625         portnum = 631;
 626       else if (!strcmp(service, "lpd"))
 627         portnum = 515;
 628       else if (!strcmp(service, "socket"))
 629         portnum = 9100;
 630       else
 631         return (NULL);
 632
 633      /*
 634       * This code is needed because some operating systems have a
 635       * buggy implementation of gethostbyname() that does not support
 636       * IPv4 addresses.  If the hostname string is an IPv4 address, then
 637       * sscanf() is used to extract the IPv4 components.  We then pack
 638       * the components into an IPv4 address manually, since the
 639       * inet_aton() function is deprecated.  We use the htonl() macro
 640       * to get the right byte order for the address.
 641       */
 642
 643       for (ptr = hostname; isdigit(*ptr & 255) || *ptr == '.'; ptr ++);
 644
 645       if (!*ptr)
 646       {
 647        /*
 648         * We have an IPv4 address; break it up and create an IPv4 address...
 649         */
 650
 651         if (sscanf(hostname, "%u.%u.%u.%u", ip, ip + 1, ip + 2, ip + 3) == 4 &&
 652             ip[0] <= 255 && ip[1] <= 255 && ip[2] <= 255 && ip[3] <= 255)
 653         {
 654           first = (http_addrlist_t *)calloc(1, sizeof(http_addrlist_t));
 655           if (!first)
 656             return (NULL);
 657
 658           first->addr.ipv4.sin_family = AF_INET;
 659           first->addr.ipv4.sin_addr.s_addr = htonl((((((((unsigned)ip[0] << 8) |
 660                                                        (unsigned)ip[1]) << 8) |
 661                                                      (unsigned)ip[2]) << 8) |
 662                                                    (unsigned)ip[3]));
 663           first->addr.ipv4.sin_port = htons(portnum);
 664         }
 665       }
 666       else if ((host = gethostbyname(hostname)) != NULL &&
 667 #  ifdef AF_INET6
 668                (host->h_addrtype == AF_INET || host->h_addrtype == AF_INET6))
 669 #  else
 670                host->h_addrtype == AF_INET)
 671 #  endif /* AF_INET6 */
 672       {
 673         for (i = 0; host->h_addr_list[i]; i ++)
 674         {
 675          /*
 676           * Copy the address over...
 677           */
 678
 679           temp = (http_addrlist_t *)calloc(1, sizeof(http_addrlist_t));
 680           if (!temp)
 681           {
 682             httpAddrFreeList(first);
 683             return (NULL);
 684           }
 685
 686 #  ifdef AF_INET6
 687           if (host->h_addrtype == AF_INET6)
 688           {
 689             temp->addr.ipv6.sin6_family = AF_INET6;
 690             memcpy(&(temp->addr.ipv6.sin6_addr), host->h_addr_list[i],
 691                    sizeof(temp->addr.ipv6));
 692             temp->addr.ipv6.sin6_port = htons(portnum);
 693           }
 694           else
 695 #  endif /* AF_INET6 */
 696           {
 697             temp->addr.ipv4.sin_family = AF_INET;
 698             memcpy(&(temp->addr.ipv4.sin_addr), host->h_addr_list[i],
 699                    sizeof(temp->addr.ipv4));
 700             temp->addr.ipv4.sin_port = htons(portnum);
 701           }
 702
 703          /*
 704           * Append the address to the list...
 705           */
 706
 707           if (!first)
 708             first = temp;
 709
 710           if (addr)
 711             addr->next = temp;
 712
 713           addr = temp;
 714         }
 715       }
 716       else
 717       {
 718         if (h_errno == NO_RECOVERY)
 719           cg->need_res_init = 1;
 720
 721         _cupsSetError(IPP_STATUS_ERROR_INTERNAL, hstrerror(h_errno), 0);
 722       }
 723     }
 724 #endif /* HAVE_GETADDRINFO */
 725   }
 726
 727  /*
 728   * Detect some common errors and handle them sanely...
 729   */
 730
 731   if (!addr && (!hostname || !_cups_strcasecmp(hostname, "localhost")))
 732   {
 733     struct servent      *port;          /* Port number for service */
 734     int                 portnum;        /* Port number */
 735
 736
 737    /*
 738     * Lookup the service...
 739     */
 740
 741     if (!service)
 742       portnum = 0;
 743     else if (isdigit(*service & 255))
 744       portnum = atoi(service);
 745     else if ((port = getservbyname(service, NULL)) != NULL)
 746       portnum = ntohs(port->s_port);
 747     else if (!strcmp(service, "http"))
 748       portnum = 80;
 749     else if (!strcmp(service, "https"))
 750       portnum = 443;
 751     else if (!strcmp(service, "ipp") || !strcmp(service, "ipps"))
 752       portnum = 631;
 753     else if (!strcmp(service, "lpd"))
 754       portnum = 515;
 755     else if (!strcmp(service, "socket"))
 756       portnum = 9100;
 757     else
 758     {
 759       httpAddrFreeList(first);
 760
 761       _cupsSetError(IPP_STATUS_ERROR_INTERNAL, _("Unknown service name."), 1);
 762       return (NULL);
 763     }
 764
 765     if (hostname && !_cups_strcasecmp(hostname, "localhost"))
 766     {
 767      /*
 768       * Unfortunately, some users ignore all of the warnings in the
 769       * /etc/hosts file and delete "localhost" from it. If we get here
 770       * then we were unable to resolve the name, so use the IPv6 and/or
 771       * IPv4 loopback interface addresses...
 772       */
 773
 774 #ifdef AF_INET6
 775       if (family != AF_INET)
 776       {
 777        /*
 778         * Add [::1] to the address list...
 779         */
 780
 781         temp = (http_addrlist_t *)calloc(1, sizeof(http_addrlist_t));
 782         if (!temp)
 783         {
 784           _cupsSetError(IPP_STATUS_ERROR_INTERNAL, strerror(errno), 0);
 785           httpAddrFreeList(first);
 786           return (NULL);
 787         }
 788
 789         temp->addr.ipv6.sin6_family            = AF_INET6;
 790         temp->addr.ipv6.sin6_port              = htons(portnum);
 791 #  ifdef WIN32
 792         temp->addr.ipv6.sin6_addr.u.Byte[15]   = 1;
 793 #  else
 794         temp->addr.ipv6.sin6_addr.s6_addr32[3] = htonl(1);
 795 #  endif /* WIN32 */
 796
 797         if (!first)
 798           first = temp;
 799
 800         addr = temp;
 801       }
 802
 803       if (family != AF_INET6)
 804 #endif /* AF_INET6 */
 805       {
 806        /*
 807         * Add 127.0.0.1 to the address list...
 808         */
 809
 810         temp = (http_addrlist_t *)calloc(1, sizeof(http_addrlist_t));
 811         if (!temp)
 812         {
 813           _cupsSetError(IPP_STATUS_ERROR_INTERNAL, strerror(errno), 0);
 814           httpAddrFreeList(first);
 815           return (NULL);
 816         }
 817
 818         temp->addr.ipv4.sin_family      = AF_INET;
 819         temp->addr.ipv4.sin_port        = htons(portnum);
 820         temp->addr.ipv4.sin_addr.s_addr = htonl(0x7f000001);
 821
 822         if (!first)
 823           first = temp;
 824
 825         if (addr)
 826           addr->next = temp;
 827       }
 828     }
 829     else if (!hostname)
 830     {
 831      /*
 832       * Provide one or more passive listening addresses...
 833       */
 834
 835 #ifdef AF_INET6
 836       if (family != AF_INET)
 837       {
 838        /*
 839         * Add [::] to the address list...
 840         */
 841
 842         temp = (http_addrlist_t *)calloc(1, sizeof(http_addrlist_t));
 843         if (!temp)
 844         {
 845           _cupsSetError(IPP_STATUS_ERROR_INTERNAL, strerror(errno), 0);
 846           httpAddrFreeList(first);
 847           return (NULL);
 848         }
 849
 850         temp->addr.ipv6.sin6_family = AF_INET6;
 851         temp->addr.ipv6.sin6_port   = htons(portnum);
 852
 853         if (!first)
 854           first = temp;
 855
 856         addr = temp;
 857       }
 858
 859       if (family != AF_INET6)
 860 #endif /* AF_INET6 */
 861       {
 862        /*
 863         * Add 0.0.0.0 to the address list...
 864         */
 865
 866         temp = (http_addrlist_t *)calloc(1, sizeof(http_addrlist_t));
 867         if (!temp)
 868         {
 869           _cupsSetError(IPP_STATUS_ERROR_INTERNAL, strerror(errno), 0);
 870           httpAddrFreeList(first);
 871           return (NULL);
 872         }
 873
 874         temp->addr.ipv4.sin_family = AF_INET;
 875         temp->addr.ipv4.sin_port   = htons(portnum);
 876
 877         if (!first)
 878           first = temp;
 879
 880         if (addr)
 881           addr->next = temp;
 882       }
 883     }
 884   }
 885
 886  /*
 887   * Return the address list...
 888   */
 889
 890   return (first);
 891 }
 892
 893
 894 /*
 895  * End of "$Id$".
 896  */