cups/http-addr.c

   1 /*
   2  * "$Id$"
   3  *
   4  * HTTP address routines for CUPS.
   5  *
   6  * Copyright 2007-2014 by Apple Inc.
   7  * Copyright 1997-2006 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
  16 /*
  17  * Include necessary headers...
  18  */
  19
  20 #include "cups-private.h"
  21 #include <sys/stat.h>
  22 #ifdef HAVE_RESOLV_H
  23 #  include <resolv.h>
  24 #endif /* HAVE_RESOLV_H */
  25 #ifdef __APPLE__
  26 #  include <CoreFoundation/CoreFoundation.h>
  27 #  include <SystemConfiguration/SystemConfiguration.h>
  28 #endif /* __APPLE__ */
  29
  30
  31 /*
  32  * 'httpAddrAny()' - Check for the "any" address.
  33  *
  34  * @since CUPS 1.2/OS X 10.5@
  35  */
  36
  37 int                                     /* O - 1 if "any", 0 otherwise */
  38 httpAddrAny(const http_addr_t *addr)    /* I - Address to check */
  39 {
  40   if (!addr)
  41     return (0);
  42
  43 #ifdef AF_INET6
  44   if (addr->addr.sa_family == AF_INET6 &&
  45       IN6_IS_ADDR_UNSPECIFIED(&(addr->ipv6.sin6_addr)))
  46     return (1);
  47 #endif /* AF_INET6 */
  48
  49   if (addr->addr.sa_family == AF_INET &&
  50       ntohl(addr->ipv4.sin_addr.s_addr) == 0x00000000)
  51     return (1);
  52
  53   return (0);
  54 }
  55
  56
  57 /*
  58  * 'httpAddrClose()' - Close a socket created by @link httpAddrConnect@ or
  59  *                     @link httpAddrListen@.
  60  *
  61  * Pass @code NULL@ for sockets created with @link httpAddrConnect@ and the
  62  * listen address for sockets created with @link httpAddrListen@. This will
  63  * ensure that domain sockets are removed when closed.
  64  *
  65  * @since CUPS 2.0@
  66  */
  67
  68 int                                             /* O - 0 on success, -1 on failure */
  69 httpAddrClose(http_addr_t *addr,                /* I - Listen address or @code NULL@ */
  70               int         fd)                   /* I - Socket file descriptor */
  71 {
  72 #ifdef WIN32
  73   if (closesocket(fd))
  74 #else
  75   if (close(fd))
  76 #endif /* WIN32 */
  77     return (-1);
  78
  79 #ifdef AF_LOCAL
  80   if (addr && addr->addr.sa_family == AF_LOCAL)
  81     return (unlink(addr->un.sun_path));
  82 #endif /* AF_LOCAL */
  83
  84   return (0);
  85 }
  86
  87
  88 /*
  89  * 'httpAddrEqual()' - Compare two addresses.
  90  *
  91  * @since CUPS 1.2/OS X 10.5@
  92  */
  93
  94 int                                             /* O - 1 if equal, 0 if not */
  95 httpAddrEqual(const http_addr_t *addr1,         /* I - First address */
  96               const http_addr_t *addr2)         /* I - Second address */
  97 {
  98   if (!addr1 && !addr2)
  99     return (1);
 100
 101   if (!addr1 || !addr2)
 102     return (0);
 103
 104   if (addr1->addr.sa_family != addr2->addr.sa_family)
 105     return (0);
 106
 107 #ifdef AF_LOCAL
 108   if (addr1->addr.sa_family == AF_LOCAL)
 109     return (!strcmp(addr1->un.sun_path, addr2->un.sun_path));
 110 #endif /* AF_LOCAL */
 111
 112 #ifdef AF_INET6
 113   if (addr1->addr.sa_family == AF_INET6)
 114     return (!memcmp(&(addr1->ipv6.sin6_addr), &(addr2->ipv6.sin6_addr), 16));
 115 #endif /* AF_INET6 */
 116
 117   return (addr1->ipv4.sin_addr.s_addr == addr2->ipv4.sin_addr.s_addr);
 118 }
 119
 120
 121 /*
 122  * 'httpAddrLength()' - Return the length of the address in bytes.
 123  *
 124  * @since CUPS 1.2/OS X 10.5@
 125  */
 126
 127 int                                     /* O - Length in bytes */
 128 httpAddrLength(const http_addr_t *addr) /* I - Address */
 129 {
 130   if (!addr)
 131     return (0);
 132
 133 #ifdef AF_INET6
 134   if (addr->addr.sa_family == AF_INET6)
 135     return (sizeof(addr->ipv6));
 136   else
 137 #endif /* AF_INET6 */
 138 #ifdef AF_LOCAL
 139   if (addr->addr.sa_family == AF_LOCAL)
 140     return ((int)(offsetof(struct sockaddr_un, sun_path) + strlen(addr->un.sun_path) + 1));
 141   else
 142 #endif /* AF_LOCAL */
 143   if (addr->addr.sa_family == AF_INET)
 144     return (sizeof(addr->ipv4));
 145   else
 146     return (0);
 147
 148 }
 149
 150
 151 /*
 152  * 'httpAddrListen()' - Create a listening socket bound to the specified
 153  *                      address and port.
 154  *
 155  * @since CUPS 1.7/OS X 10.9@
 156  */
 157
 158 int                                     /* O - Socket or -1 on error */
 159 httpAddrListen(http_addr_t *addr,       /* I - Address to bind to */
 160                int         port)        /* I - Port number to bind to */
 161 {
 162   int           fd = -1,                /* Socket */
 163                 val,                    /* Socket value */
 164                 status;                 /* Bind status */
 165
 166
 167  /*
 168   * Range check input...
 169   */
 170
 171   if (!addr || port < 0)
 172     return (-1);
 173
 174  /*
 175   * Create the socket and set options...
 176   */
 177
 178   if ((fd = socket(addr->addr.sa_family, SOCK_STREAM, 0)) < 0)
 179   {
 180     _cupsSetHTTPError(HTTP_STATUS_ERROR);
 181     return (-1);
 182   }
 183
 184   val = 1;
 185   setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, CUPS_SOCAST &val, sizeof(val));
 186
 187 #ifdef IPV6_V6ONLY
 188   if (addr->addr.sa_family == AF_INET6)
 189     setsockopt(fd, IPPROTO_IPV6, IPV6_V6ONLY, CUPS_SOCAST &val, sizeof(val));
 190 #endif /* IPV6_V6ONLY */
 191
 192  /*
 193   * Bind the socket...
 194   */
 195
 196 #ifdef AF_LOCAL
 197   if (addr->addr.sa_family == AF_LOCAL)
 198   {
 199     mode_t      mask;                   /* Umask setting */
 200
 201    /*
 202     * Remove any existing domain socket file...
 203     */
 204
 205     unlink(addr->un.sun_path);
 206
 207    /*
 208     * Save the current umask and set it to 0 so that all users can access
 209     * the domain socket...
 210     */
 211
 212     mask = umask(0);
 213
 214    /*
 215     * Bind the domain socket...
 216     */
 217
 218     status = bind(fd, (struct sockaddr *)addr, (socklen_t)httpAddrLength(addr));
 219
 220    /*
 221     * Restore the umask and fix permissions...
 222     */
 223
 224     umask(mask);
 225     chmod(addr->un.sun_path, 0140777);
 226   }
 227   else
 228 #endif /* AF_LOCAL */
 229   {
 230     _httpAddrSetPort(addr, port);
 231
 232     status = bind(fd, (struct sockaddr *)addr, (socklen_t)httpAddrLength(addr));
 233   }
 234
 235   if (status)
 236   {
 237     _cupsSetHTTPError(HTTP_STATUS_ERROR);
 238
 239     close(fd);
 240
 241     return (-1);
 242   }
 243
 244  /*
 245   * Listen...
 246   */
 247
 248   if (listen(fd, 5))
 249   {
 250     _cupsSetHTTPError(HTTP_STATUS_ERROR);
 251
 252     close(fd);
 253
 254     return (-1);
 255   }
 256
 257  /*
 258   * Close on exec...
 259   */
 260
 261 #ifndef WIN32
 262   fcntl(fd, F_SETFD, fcntl(fd, F_GETFD) | FD_CLOEXEC);
 263 #endif /* !WIN32 */
 264
 265 #ifdef SO_NOSIGPIPE
 266  /*
 267   * Disable SIGPIPE for this socket.
 268   */
 269
 270   val = 1;
 271   setsockopt(fd, SOL_SOCKET, SO_NOSIGPIPE, CUPS_SOCAST &val, sizeof(val));
 272 #endif /* SO_NOSIGPIPE */
 273
 274   return (fd);
 275 }
 276
 277
 278 /*
 279  * 'httpAddrLocalhost()' - Check for the local loopback address.
 280  *
 281  * @since CUPS 1.2/OS X 10.5@
 282  */
 283
 284 int                                     /* O - 1 if local host, 0 otherwise */
 285 httpAddrLocalhost(
 286     const http_addr_t *addr)            /* I - Address to check */
 287 {
 288   if (!addr)
 289     return (1);
 290
 291 #ifdef AF_INET6
 292   if (addr->addr.sa_family == AF_INET6 &&
 293       IN6_IS_ADDR_LOOPBACK(&(addr->ipv6.sin6_addr)))
 294     return (1);
 295 #endif /* AF_INET6 */
 296
 297 #ifdef AF_LOCAL
 298   if (addr->addr.sa_family == AF_LOCAL)
 299     return (1);
 300 #endif /* AF_LOCAL */
 301
 302   if (addr->addr.sa_family == AF_INET &&
 303       (ntohl(addr->ipv4.sin_addr.s_addr) & 0xff000000) == 0x7f000000)
 304     return (1);
 305
 306   return (0);
 307 }
 308
 309
 310 /*
 311  * 'httpAddrLookup()' - Lookup the hostname associated with the address.
 312  *
 313  * @since CUPS 1.2/OS X 10.5@
 314  */
 315
 316 char *                                  /* O - Host name */
 317 httpAddrLookup(
 318     const http_addr_t *addr,            /* I - Address to lookup */
 319     char              *name,            /* I - Host name buffer */
 320     int               namelen)          /* I - Size of name buffer */
 321 {
 322   _cups_globals_t       *cg = _cupsGlobals();
 323                                         /* Global data */
 324
 325
 326   DEBUG_printf(("httpAddrLookup(addr=%p, name=%p, namelen=%d)", addr, name,
 327                 namelen));
 328
 329  /*
 330   * Range check input...
 331   */
 332
 333   if (!addr || !name || namelen <= 2)
 334   {
 335     if (name && namelen >= 1)
 336       *name = '\0';
 337
 338     return (NULL);
 339   }
 340
 341 #ifdef AF_LOCAL
 342   if (addr->addr.sa_family == AF_LOCAL)
 343   {
 344     strlcpy(name, addr->un.sun_path, (size_t)namelen);
 345     return (name);
 346   }
 347 #endif /* AF_LOCAL */
 348
 349  /*
 350   * Optimize lookups for localhost/loopback addresses...
 351   */
 352
 353   if (httpAddrLocalhost(addr))
 354   {
 355     strlcpy(name, "localhost", (size_t)namelen);
 356     return (name);
 357   }
 358
 359 #ifdef HAVE_RES_INIT
 360  /*
 361   * STR #2920: Initialize resolver after failure in cups-polld
 362   *
 363   * If the previous lookup failed, re-initialize the resolver to prevent
 364   * temporary network errors from persisting.  This *should* be handled by
 365   * the resolver libraries, but apparently the glibc folks do not agree.
 366   *
 367   * We set a flag at the end of this function if we encounter an error that
 368   * requires reinitialization of the resolver functions.  We then call
 369   * res_init() if the flag is set on the next call here or in httpAddrLookup().
 370   */
 371
 372   if (cg->need_res_init)
 373   {
 374     res_init();
 375
 376     cg->need_res_init = 0;
 377   }
 378 #endif /* HAVE_RES_INIT */
 379
 380 #ifdef HAVE_GETNAMEINFO
 381   {
 382    /*
 383     * STR #2486: httpAddrLookup() fails when getnameinfo() returns EAI_AGAIN
 384     *
 385     * FWIW, I think this is really a bug in the implementation of
 386     * getnameinfo(), but falling back on httpAddrString() is easy to
 387     * do...
 388     */
 389
 390     int error = getnameinfo(&addr->addr, (socklen_t)httpAddrLength(addr), name, (socklen_t)namelen, NULL, 0, 0);
 391
 392     if (error)
 393     {
 394       if (error == EAI_FAIL)
 395         cg->need_res_init = 1;
 396
 397       return (httpAddrString(addr, name, namelen));
 398     }
 399   }
 400 #else
 401   {
 402     struct hostent      *host;                  /* Host from name service */
 403
 404
 405 #  ifdef AF_INET6
 406     if (addr->addr.sa_family == AF_INET6)
 407       host = gethostbyaddr((char *)&(addr->ipv6.sin6_addr),
 408                            sizeof(struct in_addr), AF_INET6);
 409     else
 410 #  endif /* AF_INET6 */
 411     host = gethostbyaddr((char *)&(addr->ipv4.sin_addr),
 412                          sizeof(struct in_addr), AF_INET);
 413
 414     if (host == NULL)
 415     {
 416      /*
 417       * No hostname, so return the raw address...
 418       */
 419
 420       if (h_errno == NO_RECOVERY)
 421         cg->need_res_init = 1;
 422
 423       return (httpAddrString(addr, name, namelen));
 424     }
 425
 426     strlcpy(name, host->h_name, (size_t)namelen);
 427   }
 428 #endif /* HAVE_GETNAMEINFO */
 429
 430   DEBUG_printf(("1httpAddrLookup: returning \"%s\"...", name));
 431
 432   return (name);
 433 }
 434
 435
 436 /*
 437  * 'httpAddrFamily()' - Get the address family of an address.
 438  */
 439
 440 int                                     /* O - Address family */
 441 httpAddrFamily(http_addr_t *addr)       /* I - Address */
 442 {
 443   if (addr)
 444     return (addr->addr.sa_family);
 445   else
 446     return (0);
 447 }
 448
 449
 450 /*
 451  * 'httpAddrPort()' - Get the port number associated with an address.
 452  *
 453  * @since CUPS 1.7/OS X 10.9@
 454  */
 455
 456 int                                     /* O - Port number */
 457 httpAddrPort(http_addr_t *addr)         /* I - Address */
 458 {
 459   if (!addr)
 460     return (-1);
 461 #ifdef AF_INET6
 462   else if (addr->addr.sa_family == AF_INET6)
 463     return (ntohs(addr->ipv6.sin6_port));
 464 #endif /* AF_INET6 */
 465   else if (addr->addr.sa_family == AF_INET)
 466     return (ntohs(addr->ipv4.sin_port));
 467   else
 468     return (0);
 469 }
 470
 471
 472 /*
 473  * '_httpAddrSetPort()' - Set the port number associated with an address.
 474  */
 475
 476 void
 477 _httpAddrSetPort(http_addr_t *addr,     /* I - Address */
 478                  int         port)      /* I - Port */
 479 {
 480   if (!addr || port <= 0)
 481     return;
 482
 483 #ifdef AF_INET6
 484   if (addr->addr.sa_family == AF_INET6)
 485     addr->ipv6.sin6_port = htons(port);
 486   else
 487 #endif /* AF_INET6 */
 488   if (addr->addr.sa_family == AF_INET)
 489     addr->ipv4.sin_port = htons(port);
 490 }
 491
 492
 493 /*
 494  * 'httpAddrString()' - Convert an address to a numeric string.
 495  *
 496  * @since CUPS 1.2/OS X 10.5@
 497  */
 498
 499 char *                                  /* O - Numeric address string */
 500 httpAddrString(const http_addr_t *addr, /* I - Address to convert */
 501                char              *s,    /* I - String buffer */
 502                int               slen)  /* I - Length of string */
 503 {
 504   DEBUG_printf(("httpAddrString(addr=%p, s=%p, slen=%d)", addr, s, slen));
 505
 506  /*
 507   * Range check input...
 508   */
 509
 510   if (!addr || !s || slen <= 2)
 511   {
 512     if (s && slen >= 1)
 513       *s = '\0';
 514
 515     return (NULL);
 516   }
 517
 518 #ifdef AF_LOCAL
 519   if (addr->addr.sa_family == AF_LOCAL)
 520   {
 521     if (addr->un.sun_path[0] == '/')
 522       strlcpy(s, addr->un.sun_path, (size_t)slen);
 523     else
 524       strlcpy(s, "localhost", (size_t)slen);
 525   }
 526   else
 527 #endif /* AF_LOCAL */
 528   if (addr->addr.sa_family == AF_INET)
 529   {
 530     unsigned temp;                      /* Temporary address */
 531
 532     temp = ntohl(addr->ipv4.sin_addr.s_addr);
 533
 534     snprintf(s, (size_t)slen, "%d.%d.%d.%d", (temp >> 24) & 255,
 535              (temp >> 16) & 255, (temp >> 8) & 255, temp & 255);
 536   }
 537 #ifdef AF_INET6
 538   else if (addr->addr.sa_family == AF_INET6)
 539   {
 540     char        *sptr,                  /* Pointer into string */
 541                 temps[64];              /* Temporary string for address */
 542
 543 #  ifdef HAVE_GETNAMEINFO
 544     if (getnameinfo(&addr->addr, (socklen_t)httpAddrLength(addr), temps, sizeof(temps), NULL, 0, NI_NUMERICHOST))
 545     {
 546      /*
 547       * If we get an error back, then the address type is not supported
 548       * and we should zero out the buffer...
 549       */
 550
 551       s[0] = '\0';
 552
 553       return (NULL);
 554     }
 555     else if ((sptr = strchr(temps, '%')) != NULL)
 556     {
 557      /*
 558       * Convert "%zone" to "+zone" to match URI form...
 559       */
 560
 561       *sptr = '+';
 562     }
 563
 564 #  else
 565     int         i;                      /* Looping var */
 566     unsigned    temp;                   /* Current value */
 567     const char  *prefix;                /* Prefix for address */
 568
 569
 570     prefix = "";
 571     for (sptr = temps, i = 0; i < 4 && addr->ipv6.sin6_addr.s6_addr32[i]; i ++)
 572     {
 573       temp = ntohl(addr->ipv6.sin6_addr.s6_addr32[i]);
 574
 575       snprintf(sptr, sizeof(temps) - (size_t)(sptr - temps), "%s%x", prefix, (temp >> 16) & 0xffff);
 576       prefix = ":";
 577       sptr += strlen(sptr);
 578
 579       temp &= 0xffff;
 580
 581       if (temp || i == 3 || addr->ipv6.sin6_addr.s6_addr32[i + 1])
 582       {
 583         snprintf(sptr, sizeof(temps) - (size_t)(sptr - temps), "%s%x", prefix, temp);
 584         sptr += strlen(sptr);
 585       }
 586     }
 587
 588     if (i < 4)
 589     {
 590       while (i < 4 && !addr->ipv6.sin6_addr.s6_addr32[i])
 591         i ++;
 592
 593       if (i < 4)
 594       {
 595         snprintf(sptr, sizeof(temps) - (size_t)(sptr - temps), "%s:", prefix);
 596         prefix = ":";
 597         sptr += strlen(sptr);
 598
 599         for (; i < 4; i ++)
 600         {
 601           temp = ntohl(addr->ipv6.sin6_addr.s6_addr32[i]);
 602
 603           if ((temp & 0xffff0000) ||
 604               (i > 0 && addr->ipv6.sin6_addr.s6_addr32[i - 1]))
 605           {
 606             snprintf(sptr, sizeof(temps) - (size_t)(sptr - temps), "%s%x", prefix, (temp >> 16) & 0xffff);
 607             sptr += strlen(sptr);
 608           }
 609
 610           snprintf(sptr, sizeof(temps) - (size_t)(sptr - temps), "%s%x", prefix, temp & 0xffff);
 611           sptr += strlen(sptr);
 612         }
 613       }
 614       else if (sptr == s)
 615       {
 616        /*
 617         * Empty address...
 618         */
 619
 620         strlcpy(temps, "::", sizeof(temps));
 621       }
 622       else
 623       {
 624        /*
 625         * Empty at end...
 626         */
 627
 628         strlcpy(sptr, "::", sizeof(temps) - (size_t)(sptr - temps));
 629       }
 630     }
 631 #  endif /* HAVE_GETNAMEINFO */
 632
 633    /*
 634     * Add "[v1." and "]" around IPv6 address to convert to URI form.
 635     */
 636
 637     snprintf(s, (size_t)slen, "[v1.%s]", temps);
 638   }
 639 #endif /* AF_INET6 */
 640   else
 641     strlcpy(s, "UNKNOWN", (size_t)slen);
 642
 643   DEBUG_printf(("1httpAddrString: returning \"%s\"...", s));
 644
 645   return (s);
 646 }
 647
 648
 649 /*
 650  * 'httpGetAddress()' - Get the address of the connected peer of a connection.
 651  *
 652  * Returns @code NULL@ if the socket is currently unconnected.
 653  *
 654  * @since CUPS 2.0@
 655  */
 656
 657 http_addr_t *                           /* O - Connected address or @code NULL@ */
 658 httpGetAddress(http_t *http)            /* I - HTTP connection */
 659 {
 660   if (http)
 661     return (http->hostaddr);
 662   else
 663     return (NULL);
 664 }
 665
 666
 667 /*
 668  * 'httpGetHostByName()' - Lookup a hostname or IPv4 address, and return
 669  *                         address records for the specified name.
 670  *
 671  * @deprecated@
 672  */
 673
 674 struct hostent *                        /* O - Host entry */
 675 httpGetHostByName(const char *name)     /* I - Hostname or IP address */
 676 {
 677   const char            *nameptr;       /* Pointer into name */
 678   unsigned              ip[4];          /* IP address components */
 679   _cups_globals_t       *cg = _cupsGlobals();
 680                                         /* Pointer to library globals */
 681
 682
 683   DEBUG_printf(("httpGetHostByName(name=\"%s\")", name));
 684
 685  /*
 686   * Avoid lookup delays and configuration problems when connecting
 687   * to the localhost address...
 688   */
 689
 690   if (!strcmp(name, "localhost"))
 691     name = "127.0.0.1";
 692
 693  /*
 694   * This function is needed because some operating systems have a
 695   * buggy implementation of gethostbyname() that does not support
 696   * IP addresses.  If the first character of the name string is a
 697   * number, then sscanf() is used to extract the IP components.
 698   * We then pack the components into an IPv4 address manually,
 699   * since the inet_aton() function is deprecated.  We use the
 700   * htonl() macro to get the right byte order for the address.
 701   *
 702   * We also support domain sockets when supported by the underlying
 703   * OS...
 704   */
 705
 706 #ifdef AF_LOCAL
 707   if (name[0] == '/')
 708   {
 709    /*
 710     * A domain socket address, so make an AF_LOCAL entry and return it...
 711     */
 712
 713     cg->hostent.h_name      = (char *)name;
 714     cg->hostent.h_aliases   = NULL;
 715     cg->hostent.h_addrtype  = AF_LOCAL;
 716     cg->hostent.h_length    = (int)strlen(name) + 1;
 717     cg->hostent.h_addr_list = cg->ip_ptrs;
 718     cg->ip_ptrs[0]          = (char *)name;
 719     cg->ip_ptrs[1]          = NULL;
 720
 721     DEBUG_puts("1httpGetHostByName: returning domain socket address...");
 722
 723     return (&cg->hostent);
 724   }
 725 #endif /* AF_LOCAL */
 726
 727   for (nameptr = name; isdigit(*nameptr & 255) || *nameptr == '.'; nameptr ++);
 728
 729   if (!*nameptr)
 730   {
 731    /*
 732     * We have an IPv4 address; break it up and provide the host entry
 733     * to the caller.
 734     */
 735
 736     if (sscanf(name, "%u.%u.%u.%u", ip, ip + 1, ip + 2, ip + 3) != 4)
 737       return (NULL);                    /* Must have 4 numbers */
 738
 739     if (ip[0] > 255 || ip[1] > 255 || ip[2] > 255 || ip[3] > 255)
 740       return (NULL);                    /* Invalid byte ranges! */
 741
 742     cg->ip_addr = htonl((((((((unsigned)ip[0] << 8) | (unsigned)ip[1]) << 8) |
 743                            (unsigned)ip[2]) << 8) |
 744                          (unsigned)ip[3]));
 745
 746    /*
 747     * Fill in the host entry and return it...
 748     */
 749
 750     cg->hostent.h_name      = (char *)name;
 751     cg->hostent.h_aliases   = NULL;
 752     cg->hostent.h_addrtype  = AF_INET;
 753     cg->hostent.h_length    = 4;
 754     cg->hostent.h_addr_list = cg->ip_ptrs;
 755     cg->ip_ptrs[0]          = (char *)&(cg->ip_addr);
 756     cg->ip_ptrs[1]          = NULL;
 757
 758     DEBUG_puts("1httpGetHostByName: returning IPv4 address...");
 759
 760     return (&cg->hostent);
 761   }
 762   else
 763   {
 764    /*
 765     * Use the gethostbyname() function to get the IPv4 address for
 766     * the name...
 767     */
 768
 769     DEBUG_puts("1httpGetHostByName: returning domain lookup address(es)...");
 770
 771     return (gethostbyname(name));
 772   }
 773 }
 774
 775
 776 /*
 777  * 'httpGetHostname()' - Get the FQDN for the connection or local system.
 778  *
 779  * When "http" points to a connected socket, return the hostname or
 780  * address that was used in the call to httpConnect() or httpConnectEncrypt(),
 781  * or the address of the client for the connection from httpAcceptConnection().
 782  * Otherwise, return the FQDN for the local system using both gethostname()
 783  * and gethostbyname() to get the local hostname with domain.
 784  *
 785  * @since CUPS 1.2/OS X 10.5@
 786  */
 787
 788 const char *                            /* O - FQDN for connection or system */
 789 httpGetHostname(http_t *http,           /* I - HTTP connection or NULL */
 790                 char   *s,              /* I - String buffer for name */
 791                 int    slen)            /* I - Size of buffer */
 792 {
 793   if (http)
 794   {
 795     if (!s || slen <= 1)
 796     {
 797       if (http->hostname[0] == '/')
 798         return ("localhost");
 799       else
 800         return (http->hostname);
 801     }
 802     else if (http->hostname[0] == '/')
 803       strlcpy(s, "localhost", (size_t)slen);
 804     else
 805       strlcpy(s, http->hostname, (size_t)slen);
 806   }
 807   else
 808   {
 809    /*
 810     * Get the hostname...
 811     */
 812
 813     if (!s || slen <= 1)
 814       return (NULL);
 815
 816     if (gethostname(s, (size_t)slen) < 0)
 817       strlcpy(s, "localhost", (size_t)slen);
 818
 819     if (!strchr(s, '.'))
 820     {
 821 #ifdef HAVE_SCDYNAMICSTORECOPYCOMPUTERNAME
 822      /*
 823       * The hostname is not a FQDN, so use the local hostname from the
 824       * SystemConfiguration framework...
 825       */
 826
 827       SCDynamicStoreRef sc = SCDynamicStoreCreate(kCFAllocatorDefault,
 828                                                   CFSTR("libcups"), NULL, NULL);
 829                                         /* System configuration data */
 830       CFStringRef       local = sc ? SCDynamicStoreCopyLocalHostName(sc) : NULL;
 831                                         /* Local host name */
 832       char              localStr[1024]; /* Local host name C string */
 833
 834       if (local && CFStringGetCString(local, localStr, sizeof(localStr),
 835                                       kCFStringEncodingUTF8))
 836       {
 837        /*
 838         * Append ".local." to the hostname we get...
 839         */
 840
 841         snprintf(s, (size_t)slen, "%s.local.", localStr);
 842       }
 843
 844       if (local)
 845         CFRelease(local);
 846       if (sc)
 847         CFRelease(sc);
 848
 849 #else
 850      /*
 851       * The hostname is not a FQDN, so look it up...
 852       */
 853
 854       struct hostent    *host;          /* Host entry to get FQDN */
 855
 856       if ((host = gethostbyname(s)) != NULL && host->h_name)
 857       {
 858        /*
 859         * Use the resolved hostname...
 860         */
 861
 862         strlcpy(s, host->h_name, (size_t)slen);
 863       }
 864 #endif /* HAVE_SCDYNAMICSTORECOPYCOMPUTERNAME */
 865     }
 866   }
 867
 868  /*
 869   * Return the hostname with as much domain info as we have...
 870   */
 871
 872   return (s);
 873 }
 874
 875
 876 /*
 877  * 'httpResolveHostname()' - Resolve the hostname of the HTTP connection
 878  *                           address.
 879  *
 880  * @since CUPS 2.0@
 881  */
 882
 883 const char *                            /* O - Resolved hostname or @code NULL@ */
 884 httpResolveHostname(http_t *http,       /* I - HTTP connection */
 885                     char   *buffer,     /* I - Hostname buffer */
 886                     size_t bufsize)     /* I - Size of buffer */
 887 {
 888   if (!http)
 889     return (NULL);
 890
 891   if (isdigit(http->hostname[0] & 255) || http->hostname[0] == '[')
 892   {
 893     char        temp[1024];             /* Temporary string */
 894
 895     if (httpAddrLookup(http->hostaddr, temp, sizeof(temp)))
 896       strlcpy(http->hostname, temp, sizeof(http->hostname));
 897     else
 898       return (NULL);
 899   }
 900
 901   if (buffer)
 902   {
 903     if (http->hostname[0] == '/')
 904       strlcpy(buffer, "localhost", bufsize);
 905     else
 906       strlcpy(buffer, http->hostname, bufsize);
 907
 908     return (buffer);
 909   }
 910   else if (http->hostname[0] == '/')
 911     return ("localhost");
 912   else
 913     return (http->hostname);
 914 }
 915
 916
 917 /*
 918  * End of "$Id$".
 919  */