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  * 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 #include <sys/stat.h>
  24 #ifdef HAVE_RESOLV_H
  25 #  include <resolv.h>
  26 #endif /* HAVE_RESOLV_H */
  27 #ifdef __APPLE__
  28 #  include <CoreFoundation/CoreFoundation.h>
  29 #  include <SystemConfiguration/SystemConfiguration.h>
  30 #endif /* __APPLE__ */
  31
  32
  33 /*
  34  * 'httpAddrAny()' - Check for the "any" address.
  35  *
  36  * @since CUPS 1.2/OS X 10.5@
  37  */
  38
  39 int                                     /* O - 1 if "any", 0 otherwise */
  40 httpAddrAny(const http_addr_t *addr)    /* I - Address to check */
  41 {
  42   if (!addr)
  43     return (0);
  44
  45 #ifdef AF_INET6
  46   if (addr->addr.sa_family == AF_INET6 &&
  47       IN6_IS_ADDR_UNSPECIFIED(&(addr->ipv6.sin6_addr)))
  48     return (1);
  49 #endif /* AF_INET6 */
  50
  51   if (addr->addr.sa_family == AF_INET &&
  52       ntohl(addr->ipv4.sin_addr.s_addr) == 0x00000000)
  53     return (1);
  54
  55   return (0);
  56 }
  57
  58
  59 /*
  60  * 'httpAddrClose()' - Close a socket created by @link httpAddrConnect@ or
  61  *                     @link httpAddrListen@.
  62  *
  63  * Pass @code NULL@ for sockets created with @link httpAddrConnect@ and the
  64  * listen address for sockets created with @link httpAddrListen@. This will
  65  * ensure that domain sockets are removed when closed.
  66  *
  67  * @since CUPS 2.0/OS 10.10@
  68  */
  69
  70 int                                             /* O - 0 on success, -1 on failure */
  71 httpAddrClose(http_addr_t *addr,                /* I - Listen address or @code NULL@ */
  72               int         fd)                   /* I - Socket file descriptor */
  73 {
  74 #ifdef WIN32
  75   if (closesocket(fd))
  76 #else
  77   if (close(fd))
  78 #endif /* WIN32 */
  79     return (-1);
  80
  81 #ifdef AF_LOCAL
  82   if (addr && addr->addr.sa_family == AF_LOCAL)
  83     return (unlink(addr->un.sun_path));
  84 #endif /* AF_LOCAL */
  85
  86   return (0);
  87 }
  88
  89
  90 /*
  91  * 'httpAddrEqual()' - Compare two addresses.
  92  *
  93  * @since CUPS 1.2/OS X 10.5@
  94  */
  95
  96 int                                             /* O - 1 if equal, 0 if not */
  97 httpAddrEqual(const http_addr_t *addr1,         /* I - First address */
  98               const http_addr_t *addr2)         /* I - Second address */
  99 {
 100   if (!addr1 && !addr2)
 101     return (1);
 102
 103   if (!addr1 || !addr2)
 104     return (0);
 105
 106   if (addr1->addr.sa_family != addr2->addr.sa_family)
 107     return (0);
 108
 109 #ifdef AF_LOCAL
 110   if (addr1->addr.sa_family == AF_LOCAL)
 111     return (!strcmp(addr1->un.sun_path, addr2->un.sun_path));
 112 #endif /* AF_LOCAL */
 113
 114 #ifdef AF_INET6
 115   if (addr1->addr.sa_family == AF_INET6)
 116     return (!memcmp(&(addr1->ipv6.sin6_addr), &(addr2->ipv6.sin6_addr), 16));
 117 #endif /* AF_INET6 */
 118
 119   return (addr1->ipv4.sin_addr.s_addr == addr2->ipv4.sin_addr.s_addr);
 120 }
 121
 122
 123 /*
 124  * 'httpAddrLength()' - Return the length of the address in bytes.
 125  *
 126  * @since CUPS 1.2/OS X 10.5@
 127  */
 128
 129 int                                     /* O - Length in bytes */
 130 httpAddrLength(const http_addr_t *addr) /* I - Address */
 131 {
 132   if (!addr)
 133     return (0);
 134
 135 #ifdef AF_INET6
 136   if (addr->addr.sa_family == AF_INET6)
 137     return (sizeof(addr->ipv6));
 138   else
 139 #endif /* AF_INET6 */
 140 #ifdef AF_LOCAL
 141   if (addr->addr.sa_family == AF_LOCAL)
 142     return ((int)(offsetof(struct sockaddr_un, sun_path) + strlen(addr->un.sun_path) + 1));
 143   else
 144 #endif /* AF_LOCAL */
 145   if (addr->addr.sa_family == AF_INET)
 146     return (sizeof(addr->ipv4));
 147   else
 148     return (0);
 149
 150 }
 151
 152
 153 /*
 154  * 'httpAddrListen()' - Create a listening socket bound to the specified
 155  *                      address and port.
 156  *
 157  * @since CUPS 1.7/OS X 10.9@
 158  */
 159
 160 int                                     /* O - Socket or -1 on error */
 161 httpAddrListen(http_addr_t *addr,       /* I - Address to bind to */
 162                int         port)        /* I - Port number to bind to */
 163 {
 164   int           fd = -1,                /* Socket */
 165                 val,                    /* Socket value */
 166                 status;                 /* Bind status */
 167
 168
 169  /*
 170   * Range check input...
 171   */
 172
 173   if (!addr || port < 0)
 174     return (-1);
 175
 176  /*
 177   * Create the socket and set options...
 178   */
 179
 180   if ((fd = socket(addr->addr.sa_family, SOCK_STREAM, 0)) < 0)
 181   {
 182     _cupsSetHTTPError(HTTP_STATUS_ERROR);
 183     return (-1);
 184   }
 185
 186   val = 1;
 187   setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, CUPS_SOCAST &val, sizeof(val));
 188
 189 #ifdef IPV6_V6ONLY
 190   if (addr->addr.sa_family == AF_INET6)
 191     setsockopt(fd, IPPROTO_IPV6, IPV6_V6ONLY, CUPS_SOCAST &val, sizeof(val));
 192 #endif /* IPV6_V6ONLY */
 193
 194  /*
 195   * Bind the socket...
 196   */
 197
 198 #ifdef AF_LOCAL
 199   if (addr->addr.sa_family == AF_LOCAL)
 200   {
 201     mode_t      mask;                   /* Umask setting */
 202
 203    /*
 204     * Remove any existing domain socket file...
 205     */
 206
 207     unlink(addr->un.sun_path);
 208
 209    /*
 210     * Save the current umask and set it to 0 so that all users can access
 211     * the domain socket...
 212     */
 213
 214     mask = umask(0);
 215
 216    /*
 217     * Bind the domain socket...
 218     */
 219
 220     status = bind(fd, (struct sockaddr *)addr, (socklen_t)httpAddrLength(addr));
 221
 222    /*
 223     * Restore the umask and fix permissions...
 224     */
 225
 226     umask(mask);
 227     chmod(addr->un.sun_path, 0140777);
 228   }
 229   else
 230 #endif /* AF_LOCAL */
 231   {
 232     _httpAddrSetPort(addr, port);
 233
 234     status = bind(fd, (struct sockaddr *)addr, (socklen_t)httpAddrLength(addr));
 235   }
 236
 237   if (status)
 238   {
 239     _cupsSetHTTPError(HTTP_STATUS_ERROR);
 240
 241     close(fd);
 242
 243     return (-1);
 244   }
 245
 246  /*
 247   * Listen...
 248   */
 249
 250   if (listen(fd, 5))
 251   {
 252     _cupsSetHTTPError(HTTP_STATUS_ERROR);
 253
 254     close(fd);
 255
 256     return (-1);
 257   }
 258
 259  /*
 260   * Close on exec...
 261   */
 262
 263 #ifndef WIN32
 264   fcntl(fd, F_SETFD, fcntl(fd, F_GETFD) | FD_CLOEXEC);
 265 #endif /* !WIN32 */
 266
 267 #ifdef SO_NOSIGPIPE
 268  /*
 269   * Disable SIGPIPE for this socket.
 270   */
 271
 272   val = 1;
 273   setsockopt(fd, SOL_SOCKET, SO_NOSIGPIPE, CUPS_SOCAST &val, sizeof(val));
 274 #endif /* SO_NOSIGPIPE */
 275
 276   return (fd);
 277 }
 278
 279
 280 /*
 281  * 'httpAddrLocalhost()' - Check for the local loopback address.
 282  *
 283  * @since CUPS 1.2/OS X 10.5@
 284  */
 285
 286 int                                     /* O - 1 if local host, 0 otherwise */
 287 httpAddrLocalhost(
 288     const http_addr_t *addr)            /* I - Address to check */
 289 {
 290   if (!addr)
 291     return (1);
 292
 293 #ifdef AF_INET6
 294   if (addr->addr.sa_family == AF_INET6 &&
 295       IN6_IS_ADDR_LOOPBACK(&(addr->ipv6.sin6_addr)))
 296     return (1);
 297 #endif /* AF_INET6 */
 298
 299 #ifdef AF_LOCAL
 300   if (addr->addr.sa_family == AF_LOCAL)
 301     return (1);
 302 #endif /* AF_LOCAL */
 303
 304   if (addr->addr.sa_family == AF_INET &&
 305       (ntohl(addr->ipv4.sin_addr.s_addr) & 0xff000000) == 0x7f000000)
 306     return (1);
 307
 308   return (0);
 309 }
 310
 311
 312 /*
 313  * 'httpAddrLookup()' - Lookup the hostname associated with the address.
 314  *
 315  * @since CUPS 1.2/OS X 10.5@
 316  */
 317
 318 char *                                  /* O - Host name */
 319 httpAddrLookup(
 320     const http_addr_t *addr,            /* I - Address to lookup */
 321     char              *name,            /* I - Host name buffer */
 322     int               namelen)          /* I - Size of name buffer */
 323 {
 324   _cups_globals_t       *cg = _cupsGlobals();
 325                                         /* Global data */
 326
 327
 328   DEBUG_printf(("httpAddrLookup(addr=%p, name=%p, namelen=%d)", addr, name,
 329                 namelen));
 330
 331  /*
 332   * Range check input...
 333   */
 334
 335   if (!addr || !name || namelen <= 2)
 336   {
 337     if (name && namelen >= 1)
 338       *name = '\0';
 339
 340     return (NULL);
 341   }
 342
 343 #ifdef AF_LOCAL
 344   if (addr->addr.sa_family == AF_LOCAL)
 345   {
 346     strlcpy(name, addr->un.sun_path, (size_t)namelen);
 347     return (name);
 348   }
 349 #endif /* AF_LOCAL */
 350
 351  /*
 352   * Optimize lookups for localhost/loopback addresses...
 353   */
 354
 355   if (httpAddrLocalhost(addr))
 356   {
 357     strlcpy(name, "localhost", (size_t)namelen);
 358     return (name);
 359   }
 360
 361 #ifdef HAVE_RES_INIT
 362  /*
 363   * STR #2920: Initialize resolver after failure in cups-polld
 364   *
 365   * If the previous lookup failed, re-initialize the resolver to prevent
 366   * temporary network errors from persisting.  This *should* be handled by
 367   * the resolver libraries, but apparently the glibc folks do not agree.
 368   *
 369   * We set a flag at the end of this function if we encounter an error that
 370   * requires reinitialization of the resolver functions.  We then call
 371   * res_init() if the flag is set on the next call here or in httpAddrLookup().
 372   */
 373
 374   if (cg->need_res_init)
 375   {
 376     res_init();
 377
 378     cg->need_res_init = 0;
 379   }
 380 #endif /* HAVE_RES_INIT */
 381
 382 #ifdef HAVE_GETNAMEINFO
 383   {
 384    /*
 385     * STR #2486: httpAddrLookup() fails when getnameinfo() returns EAI_AGAIN
 386     *
 387     * FWIW, I think this is really a bug in the implementation of
 388     * getnameinfo(), but falling back on httpAddrString() is easy to
 389     * do...
 390     */
 391
 392     int error = getnameinfo(&addr->addr, (socklen_t)httpAddrLength(addr), name, (socklen_t)namelen, NULL, 0, 0);
 393
 394     if (error)
 395     {
 396       if (error == EAI_FAIL)
 397         cg->need_res_init = 1;
 398
 399       return (httpAddrString(addr, name, namelen));
 400     }
 401   }
 402 #else
 403   {
 404     struct hostent      *host;                  /* Host from name service */
 405
 406
 407 #  ifdef AF_INET6
 408     if (addr->addr.sa_family == AF_INET6)
 409       host = gethostbyaddr((char *)&(addr->ipv6.sin6_addr),
 410                            sizeof(struct in_addr), AF_INET6);
 411     else
 412 #  endif /* AF_INET6 */
 413     host = gethostbyaddr((char *)&(addr->ipv4.sin_addr),
 414                          sizeof(struct in_addr), AF_INET);
 415
 416     if (host == NULL)
 417     {
 418      /*
 419       * No hostname, so return the raw address...
 420       */
 421
 422       if (h_errno == NO_RECOVERY)
 423         cg->need_res_init = 1;
 424
 425       return (httpAddrString(addr, name, namelen));
 426     }
 427
 428     strlcpy(name, host->h_name, (size_t)namelen);
 429   }
 430 #endif /* HAVE_GETNAMEINFO */
 431
 432   DEBUG_printf(("1httpAddrLookup: returning \"%s\"...", name));
 433
 434   return (name);
 435 }
 436
 437
 438 /*
 439  * 'httpAddrFamily()' - Get the address family of an address.
 440  */
 441
 442 int                                     /* O - Address family */
 443 httpAddrFamily(http_addr_t *addr)       /* I - Address */
 444 {
 445   if (addr)
 446     return (addr->addr.sa_family);
 447   else
 448     return (0);
 449 }
 450
 451
 452 /*
 453  * 'httpAddrPort()' - Get the port number associated with an address.
 454  *
 455  * @since CUPS 1.7/OS X 10.9@
 456  */
 457
 458 int                                     /* O - Port number */
 459 httpAddrPort(http_addr_t *addr)         /* I - Address */
 460 {
 461   if (!addr)
 462     return (-1);
 463 #ifdef AF_INET6
 464   else if (addr->addr.sa_family == AF_INET6)
 465     return (ntohs(addr->ipv6.sin6_port));
 466 #endif /* AF_INET6 */
 467   else if (addr->addr.sa_family == AF_INET)
 468     return (ntohs(addr->ipv4.sin_port));
 469   else
 470     return (0);
 471 }
 472
 473
 474 /*
 475  * '_httpAddrSetPort()' - Set the port number associated with an address.
 476  */
 477
 478 void
 479 _httpAddrSetPort(http_addr_t *addr,     /* I - Address */
 480                  int         port)      /* I - Port */
 481 {
 482   if (!addr || port <= 0)
 483     return;
 484
 485 #ifdef AF_INET6
 486   if (addr->addr.sa_family == AF_INET6)
 487     addr->ipv6.sin6_port = htons(port);
 488   else
 489 #endif /* AF_INET6 */
 490   if (addr->addr.sa_family == AF_INET)
 491     addr->ipv4.sin_port = htons(port);
 492 }
 493
 494
 495 /*
 496  * 'httpAddrString()' - Convert an address to a numeric string.
 497  *
 498  * @since CUPS 1.2/OS X 10.5@
 499  */
 500
 501 char *                                  /* O - Numeric address string */
 502 httpAddrString(const http_addr_t *addr, /* I - Address to convert */
 503                char              *s,    /* I - String buffer */
 504                int               slen)  /* I - Length of string */
 505 {
 506   DEBUG_printf(("httpAddrString(addr=%p, s=%p, slen=%d)", addr, s, slen));
 507
 508  /*
 509   * Range check input...
 510   */
 511
 512   if (!addr || !s || slen <= 2)
 513   {
 514     if (s && slen >= 1)
 515       *s = '\0';
 516
 517     return (NULL);
 518   }
 519
 520 #ifdef AF_LOCAL
 521   if (addr->addr.sa_family == AF_LOCAL)
 522   {
 523     if (addr->un.sun_path[0] == '/')
 524       strlcpy(s, addr->un.sun_path, (size_t)slen);
 525     else
 526       strlcpy(s, "localhost", (size_t)slen);
 527   }
 528   else
 529 #endif /* AF_LOCAL */
 530   if (addr->addr.sa_family == AF_INET)
 531   {
 532     unsigned temp;                      /* Temporary address */
 533
 534     temp = ntohl(addr->ipv4.sin_addr.s_addr);
 535
 536     snprintf(s, (size_t)slen, "%d.%d.%d.%d", (temp >> 24) & 255,
 537              (temp >> 16) & 255, (temp >> 8) & 255, temp & 255);
 538   }
 539 #ifdef AF_INET6
 540   else if (addr->addr.sa_family == AF_INET6)
 541   {
 542     char        *sptr,                  /* Pointer into string */
 543                 temps[64];              /* Temporary string for address */
 544
 545 #  ifdef HAVE_GETNAMEINFO
 546     if (getnameinfo(&addr->addr, (socklen_t)httpAddrLength(addr), temps, sizeof(temps), NULL, 0, NI_NUMERICHOST))
 547     {
 548      /*
 549       * If we get an error back, then the address type is not supported
 550       * and we should zero out the buffer...
 551       */
 552
 553       s[0] = '\0';
 554
 555       return (NULL);
 556     }
 557     else if ((sptr = strchr(temps, '%')) != NULL)
 558     {
 559      /*
 560       * Convert "%zone" to "+zone" to match URI form...
 561       */
 562
 563       *sptr = '+';
 564     }
 565
 566 #  else
 567     int         i;                      /* Looping var */
 568     unsigned    temp;                   /* Current value */
 569     const char  *prefix;                /* Prefix for address */
 570
 571
 572     prefix = "";
 573     for (sptr = temps, i = 0; i < 4 && addr->ipv6.sin6_addr.s6_addr32[i]; i ++)
 574     {
 575       temp = ntohl(addr->ipv6.sin6_addr.s6_addr32[i]);
 576
 577       snprintf(sptr, sizeof(temps) - (size_t)(sptr - temps), "%s%x", prefix, (temp >> 16) & 0xffff);
 578       prefix = ":";
 579       sptr += strlen(sptr);
 580
 581       temp &= 0xffff;
 582
 583       if (temp || i == 3 || addr->ipv6.sin6_addr.s6_addr32[i + 1])
 584       {
 585         snprintf(sptr, sizeof(temps) - (size_t)(sptr - temps), "%s%x", prefix, temp);
 586         sptr += strlen(sptr);
 587       }
 588     }
 589
 590     if (i < 4)
 591     {
 592       while (i < 4 && !addr->ipv6.sin6_addr.s6_addr32[i])
 593         i ++;
 594
 595       if (i < 4)
 596       {
 597         snprintf(sptr, sizeof(temps) - (size_t)(sptr - temps), "%s:", prefix);
 598         prefix = ":";
 599         sptr += strlen(sptr);
 600
 601         for (; i < 4; i ++)
 602         {
 603           temp = ntohl(addr->ipv6.sin6_addr.s6_addr32[i]);
 604
 605           if ((temp & 0xffff0000) ||
 606               (i > 0 && addr->ipv6.sin6_addr.s6_addr32[i - 1]))
 607           {
 608             snprintf(sptr, sizeof(temps) - (size_t)(sptr - temps), "%s%x", prefix, (temp >> 16) & 0xffff);
 609             sptr += strlen(sptr);
 610           }
 611
 612           snprintf(sptr, sizeof(temps) - (size_t)(sptr - temps), "%s%x", prefix, temp & 0xffff);
 613           sptr += strlen(sptr);
 614         }
 615       }
 616       else if (sptr == s)
 617       {
 618        /*
 619         * Empty address...
 620         */
 621
 622         strlcpy(temps, "::", sizeof(temps));
 623       }
 624       else
 625       {
 626        /*
 627         * Empty at end...
 628         */
 629
 630         strlcpy(sptr, "::", sizeof(temps) - (size_t)(sptr - temps));
 631       }
 632     }
 633 #  endif /* HAVE_GETNAMEINFO */
 634
 635    /*
 636     * Add "[v1." and "]" around IPv6 address to convert to URI form.
 637     */
 638
 639     snprintf(s, (size_t)slen, "[v1.%s]", temps);
 640   }
 641 #endif /* AF_INET6 */
 642   else
 643     strlcpy(s, "UNKNOWN", (size_t)slen);
 644
 645   DEBUG_printf(("1httpAddrString: returning \"%s\"...", s));
 646
 647   return (s);
 648 }
 649
 650
 651 /*
 652  * 'httpGetAddress()' - Get the address of the connected peer of a connection.
 653  *
 654  * Returns @code NULL@ if the socket is currently unconnected.
 655  *
 656  * @since CUPS 2.0/OS 10.10@
 657  */
 658
 659 http_addr_t *                           /* O - Connected address or @code NULL@ */
 660 httpGetAddress(http_t *http)            /* I - HTTP connection */
 661 {
 662   if (http)
 663     return (http->hostaddr);
 664   else
 665     return (NULL);
 666 }
 667
 668
 669 /*
 670  * 'httpGetHostByName()' - Lookup a hostname or IPv4 address, and return
 671  *                         address records for the specified name.
 672  *
 673  * @deprecated@
 674  */
 675
 676 struct hostent *                        /* O - Host entry */
 677 httpGetHostByName(const char *name)     /* I - Hostname or IP address */
 678 {
 679   const char            *nameptr;       /* Pointer into name */
 680   unsigned              ip[4];          /* IP address components */
 681   _cups_globals_t       *cg = _cupsGlobals();
 682                                         /* Pointer to library globals */
 683
 684
 685   DEBUG_printf(("httpGetHostByName(name=\"%s\")", name));
 686
 687  /*
 688   * Avoid lookup delays and configuration problems when connecting
 689   * to the localhost address...
 690   */
 691
 692   if (!strcmp(name, "localhost"))
 693     name = "127.0.0.1";
 694
 695  /*
 696   * This function is needed because some operating systems have a
 697   * buggy implementation of gethostbyname() that does not support
 698   * IP addresses.  If the first character of the name string is a
 699   * number, then sscanf() is used to extract the IP components.
 700   * We then pack the components into an IPv4 address manually,
 701   * since the inet_aton() function is deprecated.  We use the
 702   * htonl() macro to get the right byte order for the address.
 703   *
 704   * We also support domain sockets when supported by the underlying
 705   * OS...
 706   */
 707
 708 #ifdef AF_LOCAL
 709   if (name[0] == '/')
 710   {
 711    /*
 712     * A domain socket address, so make an AF_LOCAL entry and return it...
 713     */
 714
 715     cg->hostent.h_name      = (char *)name;
 716     cg->hostent.h_aliases   = NULL;
 717     cg->hostent.h_addrtype  = AF_LOCAL;
 718     cg->hostent.h_length    = (int)strlen(name) + 1;
 719     cg->hostent.h_addr_list = cg->ip_ptrs;
 720     cg->ip_ptrs[0]          = (char *)name;
 721     cg->ip_ptrs[1]          = NULL;
 722
 723     DEBUG_puts("1httpGetHostByName: returning domain socket address...");
 724
 725     return (&cg->hostent);
 726   }
 727 #endif /* AF_LOCAL */
 728
 729   for (nameptr = name; isdigit(*nameptr & 255) || *nameptr == '.'; nameptr ++);
 730
 731   if (!*nameptr)
 732   {
 733    /*
 734     * We have an IPv4 address; break it up and provide the host entry
 735     * to the caller.
 736     */
 737
 738     if (sscanf(name, "%u.%u.%u.%u", ip, ip + 1, ip + 2, ip + 3) != 4)
 739       return (NULL);                    /* Must have 4 numbers */
 740
 741     if (ip[0] > 255 || ip[1] > 255 || ip[2] > 255 || ip[3] > 255)
 742       return (NULL);                    /* Invalid byte ranges! */
 743
 744     cg->ip_addr = htonl((((((((unsigned)ip[0] << 8) | (unsigned)ip[1]) << 8) |
 745                            (unsigned)ip[2]) << 8) |
 746                          (unsigned)ip[3]));
 747
 748    /*
 749     * Fill in the host entry and return it...
 750     */
 751
 752     cg->hostent.h_name      = (char *)name;
 753     cg->hostent.h_aliases   = NULL;
 754     cg->hostent.h_addrtype  = AF_INET;
 755     cg->hostent.h_length    = 4;
 756     cg->hostent.h_addr_list = cg->ip_ptrs;
 757     cg->ip_ptrs[0]          = (char *)&(cg->ip_addr);
 758     cg->ip_ptrs[1]          = NULL;
 759
 760     DEBUG_puts("1httpGetHostByName: returning IPv4 address...");
 761
 762     return (&cg->hostent);
 763   }
 764   else
 765   {
 766    /*
 767     * Use the gethostbyname() function to get the IPv4 address for
 768     * the name...
 769     */
 770
 771     DEBUG_puts("1httpGetHostByName: returning domain lookup address(es)...");
 772
 773     return (gethostbyname(name));
 774   }
 775 }
 776
 777
 778 /*
 779  * 'httpGetHostname()' - Get the FQDN for the connection or local system.
 780  *
 781  * When "http" points to a connected socket, return the hostname or
 782  * address that was used in the call to httpConnect() or httpConnectEncrypt(),
 783  * or the address of the client for the connection from httpAcceptConnection().
 784  * Otherwise, return the FQDN for the local system using both gethostname()
 785  * and gethostbyname() to get the local hostname with domain.
 786  *
 787  * @since CUPS 1.2/OS X 10.5@
 788  */
 789
 790 const char *                            /* O - FQDN for connection or system */
 791 httpGetHostname(http_t *http,           /* I - HTTP connection or NULL */
 792                 char   *s,              /* I - String buffer for name */
 793                 int    slen)            /* I - Size of buffer */
 794 {
 795   if (http)
 796   {
 797     if (!s || slen <= 1)
 798     {
 799       if (http->hostname[0] == '/')
 800         return ("localhost");
 801       else
 802         return (http->hostname);
 803     }
 804     else if (http->hostname[0] == '/')
 805       strlcpy(s, "localhost", (size_t)slen);
 806     else
 807       strlcpy(s, http->hostname, (size_t)slen);
 808   }
 809   else
 810   {
 811    /*
 812     * Get the hostname...
 813     */
 814
 815     if (!s || slen <= 1)
 816       return (NULL);
 817
 818     if (gethostname(s, (size_t)slen) < 0)
 819       strlcpy(s, "localhost", (size_t)slen);
 820
 821     if (!strchr(s, '.'))
 822     {
 823 #ifdef HAVE_SCDYNAMICSTORECOPYCOMPUTERNAME
 824      /*
 825       * The hostname is not a FQDN, so use the local hostname from the
 826       * SystemConfiguration framework...
 827       */
 828
 829       SCDynamicStoreRef sc = SCDynamicStoreCreate(kCFAllocatorDefault,
 830                                                   CFSTR("libcups"), NULL, NULL);
 831                                         /* System configuration data */
 832       CFStringRef       local = sc ? SCDynamicStoreCopyLocalHostName(sc) : NULL;
 833                                         /* Local host name */
 834       char              localStr[1024]; /* Local host name C string */
 835
 836       if (local && CFStringGetCString(local, localStr, sizeof(localStr),
 837                                       kCFStringEncodingUTF8))
 838       {
 839        /*
 840         * Append ".local." to the hostname we get...
 841         */
 842
 843         snprintf(s, (size_t)slen, "%s.local.", localStr);
 844       }
 845
 846       if (local)
 847         CFRelease(local);
 848       if (sc)
 849         CFRelease(sc);
 850
 851 #else
 852      /*
 853       * The hostname is not a FQDN, so look it up...
 854       */
 855
 856       struct hostent    *host;          /* Host entry to get FQDN */
 857
 858       if ((host = gethostbyname(s)) != NULL && host->h_name)
 859       {
 860        /*
 861         * Use the resolved hostname...
 862         */
 863
 864         strlcpy(s, host->h_name, (size_t)slen);
 865       }
 866 #endif /* HAVE_SCDYNAMICSTORECOPYCOMPUTERNAME */
 867     }
 868   }
 869
 870  /*
 871   * Return the hostname with as much domain info as we have...
 872   */
 873
 874   return (s);
 875 }
 876
 877
 878 /*
 879  * 'httpResolveHostname()' - Resolve the hostname of the HTTP connection
 880  *                           address.
 881  *
 882  * @since CUPS 2.0/OS 10.10@
 883  */
 884
 885 const char *                            /* O - Resolved hostname or @code NULL@ */
 886 httpResolveHostname(http_t *http,       /* I - HTTP connection */
 887                     char   *buffer,     /* I - Hostname buffer */
 888                     size_t bufsize)     /* I - Size of buffer */
 889 {
 890   if (!http)
 891     return (NULL);
 892
 893   if (isdigit(http->hostname[0] & 255) || http->hostname[0] == '[')
 894   {
 895     char        temp[1024];             /* Temporary string */
 896
 897     if (httpAddrLookup(http->hostaddr, temp, sizeof(temp)))
 898       strlcpy(http->hostname, temp, sizeof(http->hostname));
 899     else
 900       return (NULL);
 901   }
 902
 903   if (buffer)
 904   {
 905     if (http->hostname[0] == '/')
 906       strlcpy(buffer, "localhost", bufsize);
 907     else
 908       strlcpy(buffer, http->hostname, bufsize);
 909
 910     return (buffer);
 911   }
 912   else if (http->hostname[0] == '/')
 913     return ("localhost");
 914   else
 915     return (http->hostname);
 916 }
 917
 918
 919 /*
 920  * End of "$Id$".
 921  */