cups/http-addr.c

   1 /*
   2  * HTTP address routines for CUPS.
   3  *
   4  * Copyright 2007-2014 by Apple Inc.
   5  * Copyright 1997-2006 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  * 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 #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/macOS 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 httpAddrConnect2@ and the
  62  * listen address for sockets created with @link httpAddrListen@.  This function
  63  * ensures that domain sockets are removed when closed.
  64  *
  65  * @since CUPS 2.0/OS 10.10@
  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/macOS 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/macOS 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/macOS 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/macOS 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/macOS 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)", (void *)addr, (void *)name, namelen));
 327
 328  /*
 329   * Range check input...
 330   */
 331
 332   if (!addr || !name || namelen <= 2)
 333   {
 334     if (name && namelen >= 1)
 335       *name = '\0';
 336
 337     return (NULL);
 338   }
 339
 340 #ifdef AF_LOCAL
 341   if (addr->addr.sa_family == AF_LOCAL)
 342   {
 343     strlcpy(name, addr->un.sun_path, (size_t)namelen);
 344     return (name);
 345   }
 346 #endif /* AF_LOCAL */
 347
 348  /*
 349   * Optimize lookups for localhost/loopback addresses...
 350   */
 351
 352   if (httpAddrLocalhost(addr))
 353   {
 354     strlcpy(name, "localhost", (size_t)namelen);
 355     return (name);
 356   }
 357
 358 #ifdef HAVE_RES_INIT
 359  /*
 360   * STR #2920: Initialize resolver after failure in cups-polld
 361   *
 362   * If the previous lookup failed, re-initialize the resolver to prevent
 363   * temporary network errors from persisting.  This *should* be handled by
 364   * the resolver libraries, but apparently the glibc folks do not agree.
 365   *
 366   * We set a flag at the end of this function if we encounter an error that
 367   * requires reinitialization of the resolver functions.  We then call
 368   * res_init() if the flag is set on the next call here or in httpAddrLookup().
 369   */
 370
 371   if (cg->need_res_init)
 372   {
 373     res_init();
 374
 375     cg->need_res_init = 0;
 376   }
 377 #endif /* HAVE_RES_INIT */
 378
 379 #ifdef HAVE_GETNAMEINFO
 380   {
 381    /*
 382     * STR #2486: httpAddrLookup() fails when getnameinfo() returns EAI_AGAIN
 383     *
 384     * FWIW, I think this is really a bug in the implementation of
 385     * getnameinfo(), but falling back on httpAddrString() is easy to
 386     * do...
 387     */
 388
 389     int error = getnameinfo(&addr->addr, (socklen_t)httpAddrLength(addr), name, (socklen_t)namelen, NULL, 0, 0);
 390
 391     if (error)
 392     {
 393       if (error == EAI_FAIL)
 394         cg->need_res_init = 1;
 395
 396       return (httpAddrString(addr, name, namelen));
 397     }
 398   }
 399 #else
 400   {
 401     struct hostent      *host;                  /* Host from name service */
 402
 403
 404 #  ifdef AF_INET6
 405     if (addr->addr.sa_family == AF_INET6)
 406       host = gethostbyaddr((char *)&(addr->ipv6.sin6_addr),
 407                            sizeof(struct in_addr), AF_INET6);
 408     else
 409 #  endif /* AF_INET6 */
 410     host = gethostbyaddr((char *)&(addr->ipv4.sin_addr),
 411                          sizeof(struct in_addr), AF_INET);
 412
 413     if (host == NULL)
 414     {
 415      /*
 416       * No hostname, so return the raw address...
 417       */
 418
 419       if (h_errno == NO_RECOVERY)
 420         cg->need_res_init = 1;
 421
 422       return (httpAddrString(addr, name, namelen));
 423     }
 424
 425     strlcpy(name, host->h_name, (size_t)namelen);
 426   }
 427 #endif /* HAVE_GETNAMEINFO */
 428
 429   DEBUG_printf(("1httpAddrLookup: returning \"%s\"...", name));
 430
 431   return (name);
 432 }
 433
 434
 435 /*
 436  * 'httpAddrFamily()' - Get the address family of an address.
 437  */
 438
 439 int                                     /* O - Address family */
 440 httpAddrFamily(http_addr_t *addr)       /* I - Address */
 441 {
 442   if (addr)
 443     return (addr->addr.sa_family);
 444   else
 445     return (0);
 446 }
 447
 448
 449 /*
 450  * 'httpAddrPort()' - Get the port number associated with an address.
 451  *
 452  * @since CUPS 1.7/macOS 10.9@
 453  */
 454
 455 int                                     /* O - Port number */
 456 httpAddrPort(http_addr_t *addr)         /* I - Address */
 457 {
 458   if (!addr)
 459     return (-1);
 460 #ifdef AF_INET6
 461   else if (addr->addr.sa_family == AF_INET6)
 462     return (ntohs(addr->ipv6.sin6_port));
 463 #endif /* AF_INET6 */
 464   else if (addr->addr.sa_family == AF_INET)
 465     return (ntohs(addr->ipv4.sin_port));
 466   else
 467     return (0);
 468 }
 469
 470
 471 /*
 472  * '_httpAddrSetPort()' - Set the port number associated with an address.
 473  */
 474
 475 void
 476 _httpAddrSetPort(http_addr_t *addr,     /* I - Address */
 477                  int         port)      /* I - Port */
 478 {
 479   if (!addr || port <= 0)
 480     return;
 481
 482 #ifdef AF_INET6
 483   if (addr->addr.sa_family == AF_INET6)
 484     addr->ipv6.sin6_port = htons(port);
 485   else
 486 #endif /* AF_INET6 */
 487   if (addr->addr.sa_family == AF_INET)
 488     addr->ipv4.sin_port = htons(port);
 489 }
 490
 491
 492 /*
 493  * 'httpAddrString()' - Convert an address to a numeric string.
 494  *
 495  * @since CUPS 1.2/macOS 10.5@
 496  */
 497
 498 char *                                  /* O - Numeric address string */
 499 httpAddrString(const http_addr_t *addr, /* I - Address to convert */
 500                char              *s,    /* I - String buffer */
 501                int               slen)  /* I - Length of string */
 502 {
 503   DEBUG_printf(("httpAddrString(addr=%p, s=%p, slen=%d)", (void *)addr, (void *)s, slen));
 504
 505  /*
 506   * Range check input...
 507   */
 508
 509   if (!addr || !s || slen <= 2)
 510   {
 511     if (s && slen >= 1)
 512       *s = '\0';
 513
 514     return (NULL);
 515   }
 516
 517 #ifdef AF_LOCAL
 518   if (addr->addr.sa_family == AF_LOCAL)
 519   {
 520     if (addr->un.sun_path[0] == '/')
 521       strlcpy(s, addr->un.sun_path, (size_t)slen);
 522     else
 523       strlcpy(s, "localhost", (size_t)slen);
 524   }
 525   else
 526 #endif /* AF_LOCAL */
 527   if (addr->addr.sa_family == AF_INET)
 528   {
 529     unsigned temp;                      /* Temporary address */
 530
 531     temp = ntohl(addr->ipv4.sin_addr.s_addr);
 532
 533     snprintf(s, (size_t)slen, "%d.%d.%d.%d", (temp >> 24) & 255,
 534              (temp >> 16) & 255, (temp >> 8) & 255, temp & 255);
 535   }
 536 #ifdef AF_INET6
 537   else if (addr->addr.sa_family == AF_INET6)
 538   {
 539     char        *sptr,                  /* Pointer into string */
 540                 temps[64];              /* Temporary string for address */
 541
 542 #  ifdef HAVE_GETNAMEINFO
 543     if (getnameinfo(&addr->addr, (socklen_t)httpAddrLength(addr), temps, sizeof(temps), NULL, 0, NI_NUMERICHOST))
 544     {
 545      /*
 546       * If we get an error back, then the address type is not supported
 547       * and we should zero out the buffer...
 548       */
 549
 550       s[0] = '\0';
 551
 552       return (NULL);
 553     }
 554     else if ((sptr = strchr(temps, '%')) != NULL)
 555     {
 556      /*
 557       * Convert "%zone" to "+zone" to match URI form...
 558       */
 559
 560       *sptr = '+';
 561     }
 562
 563 #  else
 564     int         i;                      /* Looping var */
 565     unsigned    temp;                   /* Current value */
 566     const char  *prefix;                /* Prefix for address */
 567
 568
 569     prefix = "";
 570     for (sptr = temps, i = 0; i < 4 && addr->ipv6.sin6_addr.s6_addr32[i]; i ++)
 571     {
 572       temp = ntohl(addr->ipv6.sin6_addr.s6_addr32[i]);
 573
 574       snprintf(sptr, sizeof(temps) - (size_t)(sptr - temps), "%s%x", prefix, (temp >> 16) & 0xffff);
 575       prefix = ":";
 576       sptr += strlen(sptr);
 577
 578       temp &= 0xffff;
 579
 580       if (temp || i == 3 || addr->ipv6.sin6_addr.s6_addr32[i + 1])
 581       {
 582         snprintf(sptr, sizeof(temps) - (size_t)(sptr - temps), "%s%x", prefix, temp);
 583         sptr += strlen(sptr);
 584       }
 585     }
 586
 587     if (i < 4)
 588     {
 589       while (i < 4 && !addr->ipv6.sin6_addr.s6_addr32[i])
 590         i ++;
 591
 592       if (i < 4)
 593       {
 594         snprintf(sptr, sizeof(temps) - (size_t)(sptr - temps), "%s:", prefix);
 595         prefix = ":";
 596         sptr += strlen(sptr);
 597
 598         for (; i < 4; i ++)
 599         {
 600           temp = ntohl(addr->ipv6.sin6_addr.s6_addr32[i]);
 601
 602           if ((temp & 0xffff0000) ||
 603               (i > 0 && addr->ipv6.sin6_addr.s6_addr32[i - 1]))
 604           {
 605             snprintf(sptr, sizeof(temps) - (size_t)(sptr - temps), "%s%x", prefix, (temp >> 16) & 0xffff);
 606             sptr += strlen(sptr);
 607           }
 608
 609           snprintf(sptr, sizeof(temps) - (size_t)(sptr - temps), "%s%x", prefix, temp & 0xffff);
 610           sptr += strlen(sptr);
 611         }
 612       }
 613       else if (sptr == s)
 614       {
 615        /*
 616         * Empty address...
 617         */
 618
 619         strlcpy(temps, "::", sizeof(temps));
 620       }
 621       else
 622       {
 623        /*
 624         * Empty at end...
 625         */
 626
 627         strlcpy(sptr, "::", sizeof(temps) - (size_t)(sptr - temps));
 628       }
 629     }
 630 #  endif /* HAVE_GETNAMEINFO */
 631
 632    /*
 633     * Add "[v1." and "]" around IPv6 address to convert to URI form.
 634     */
 635
 636     snprintf(s, (size_t)slen, "[v1.%s]", temps);
 637   }
 638 #endif /* AF_INET6 */
 639   else
 640     strlcpy(s, "UNKNOWN", (size_t)slen);
 641
 642   DEBUG_printf(("1httpAddrString: returning \"%s\"...", s));
 643
 644   return (s);
 645 }
 646
 647
 648 /*
 649  * 'httpGetAddress()' - Get the address of the connected peer of a connection.
 650  *
 651  * For connections created with @link httpConnect2@, the address is for the
 652  * server.  For connections created with @link httpAccept@, the address is for
 653  * the client.
 654  *
 655  * Returns @code NULL@ if the socket is currently unconnected.
 656  *
 657  * @since CUPS 2.0/OS 10.10@
 658  */
 659
 660 http_addr_t *                           /* O - Connected address or @code NULL@ */
 661 httpGetAddress(http_t *http)            /* I - HTTP connection */
 662 {
 663   if (http)
 664     return (http->hostaddr);
 665   else
 666     return (NULL);
 667 }
 668
 669
 670 /*
 671  * 'httpGetHostByName()' - Lookup a hostname or IPv4 address, and return
 672  *                         address records for the specified name.
 673  *
 674  * @deprecated@ @exclude all@
 675  */
 676
 677 struct hostent *                        /* O - Host entry */
 678 httpGetHostByName(const char *name)     /* I - Hostname or IP address */
 679 {
 680   const char            *nameptr;       /* Pointer into name */
 681   unsigned              ip[4];          /* IP address components */
 682   _cups_globals_t       *cg = _cupsGlobals();
 683                                         /* Pointer to library globals */
 684
 685
 686   DEBUG_printf(("httpGetHostByName(name=\"%s\")", name));
 687
 688  /*
 689   * Avoid lookup delays and configuration problems when connecting
 690   * to the localhost address...
 691   */
 692
 693   if (!strcmp(name, "localhost"))
 694     name = "127.0.0.1";
 695
 696  /*
 697   * This function is needed because some operating systems have a
 698   * buggy implementation of gethostbyname() that does not support
 699   * IP addresses.  If the first character of the name string is a
 700   * number, then sscanf() is used to extract the IP components.
 701   * We then pack the components into an IPv4 address manually,
 702   * since the inet_aton() function is deprecated.  We use the
 703   * htonl() macro to get the right byte order for the address.
 704   *
 705   * We also support domain sockets when supported by the underlying
 706   * OS...
 707   */
 708
 709 #ifdef AF_LOCAL
 710   if (name[0] == '/')
 711   {
 712    /*
 713     * A domain socket address, so make an AF_LOCAL entry and return it...
 714     */
 715
 716     cg->hostent.h_name      = (char *)name;
 717     cg->hostent.h_aliases   = NULL;
 718     cg->hostent.h_addrtype  = AF_LOCAL;
 719     cg->hostent.h_length    = (int)strlen(name) + 1;
 720     cg->hostent.h_addr_list = cg->ip_ptrs;
 721     cg->ip_ptrs[0]          = (char *)name;
 722     cg->ip_ptrs[1]          = NULL;
 723
 724     DEBUG_puts("1httpGetHostByName: returning domain socket address...");
 725
 726     return (&cg->hostent);
 727   }
 728 #endif /* AF_LOCAL */
 729
 730   for (nameptr = name; isdigit(*nameptr & 255) || *nameptr == '.'; nameptr ++);
 731
 732   if (!*nameptr)
 733   {
 734    /*
 735     * We have an IPv4 address; break it up and provide the host entry
 736     * to the caller.
 737     */
 738
 739     if (sscanf(name, "%u.%u.%u.%u", ip, ip + 1, ip + 2, ip + 3) != 4)
 740       return (NULL);                    /* Must have 4 numbers */
 741
 742     if (ip[0] > 255 || ip[1] > 255 || ip[2] > 255 || ip[3] > 255)
 743       return (NULL);                    /* Invalid byte ranges! */
 744
 745     cg->ip_addr = htonl((((((((unsigned)ip[0] << 8) | (unsigned)ip[1]) << 8) |
 746                            (unsigned)ip[2]) << 8) |
 747                          (unsigned)ip[3]));
 748
 749    /*
 750     * Fill in the host entry and return it...
 751     */
 752
 753     cg->hostent.h_name      = (char *)name;
 754     cg->hostent.h_aliases   = NULL;
 755     cg->hostent.h_addrtype  = AF_INET;
 756     cg->hostent.h_length    = 4;
 757     cg->hostent.h_addr_list = cg->ip_ptrs;
 758     cg->ip_ptrs[0]          = (char *)&(cg->ip_addr);
 759     cg->ip_ptrs[1]          = NULL;
 760
 761     DEBUG_puts("1httpGetHostByName: returning IPv4 address...");
 762
 763     return (&cg->hostent);
 764   }
 765   else
 766   {
 767    /*
 768     * Use the gethostbyname() function to get the IPv4 address for
 769     * the name...
 770     */
 771
 772     DEBUG_puts("1httpGetHostByName: returning domain lookup address(es)...");
 773
 774     return (gethostbyname(name));
 775   }
 776 }
 777
 778
 779 /*
 780  * 'httpGetHostname()' - Get the FQDN for the connection or local system.
 781  *
 782  * When "http" points to a connected socket, return the hostname or
 783  * address that was used in the call to httpConnect() or httpConnectEncrypt(),
 784  * or the address of the client for the connection from httpAcceptConnection().
 785  * Otherwise, return the FQDN for the local system using both gethostname()
 786  * and gethostbyname() to get the local hostname with domain.
 787  *
 788  * @since CUPS 1.2/macOS 10.5@
 789  */
 790
 791 const char *                            /* O - FQDN for connection or system */
 792 httpGetHostname(http_t *http,           /* I - HTTP connection or NULL */
 793                 char   *s,              /* I - String buffer for name */
 794                 int    slen)            /* I - Size of buffer */
 795 {
 796   if (http)
 797   {
 798     if (!s || slen <= 1)
 799     {
 800       if (http->hostname[0] == '/')
 801         return ("localhost");
 802       else
 803         return (http->hostname);
 804     }
 805     else if (http->hostname[0] == '/')
 806       strlcpy(s, "localhost", (size_t)slen);
 807     else
 808       strlcpy(s, http->hostname, (size_t)slen);
 809   }
 810   else
 811   {
 812    /*
 813     * Get the hostname...
 814     */
 815
 816     if (!s || slen <= 1)
 817       return (NULL);
 818
 819     if (gethostname(s, (size_t)slen) < 0)
 820       strlcpy(s, "localhost", (size_t)slen);
 821
 822     if (!strchr(s, '.'))
 823     {
 824 #ifdef HAVE_SCDYNAMICSTORECOPYCOMPUTERNAME
 825      /*
 826       * The hostname is not a FQDN, so use the local hostname from the
 827       * SystemConfiguration framework...
 828       */
 829
 830       SCDynamicStoreRef sc = SCDynamicStoreCreate(kCFAllocatorDefault,
 831                                                   CFSTR("libcups"), NULL, NULL);
 832                                         /* System configuration data */
 833       CFStringRef       local = sc ? SCDynamicStoreCopyLocalHostName(sc) : NULL;
 834                                         /* Local host name */
 835       char              localStr[1024]; /* Local host name C string */
 836
 837       if (local && CFStringGetCString(local, localStr, sizeof(localStr),
 838                                       kCFStringEncodingUTF8))
 839       {
 840        /*
 841         * Append ".local." to the hostname we get...
 842         */
 843
 844         snprintf(s, (size_t)slen, "%s.local.", localStr);
 845       }
 846
 847       if (local)
 848         CFRelease(local);
 849       if (sc)
 850         CFRelease(sc);
 851
 852 #else
 853      /*
 854       * The hostname is not a FQDN, so look it up...
 855       */
 856
 857       struct hostent    *host;          /* Host entry to get FQDN */
 858
 859       if ((host = gethostbyname(s)) != NULL && host->h_name)
 860       {
 861        /*
 862         * Use the resolved hostname...
 863         */
 864
 865         strlcpy(s, host->h_name, (size_t)slen);
 866       }
 867 #endif /* HAVE_SCDYNAMICSTORECOPYCOMPUTERNAME */
 868     }
 869
 870    /*
 871     * Make sure .local hostnames end with a period...
 872     */
 873
 874     if (strlen(s) > 6 && !strcmp(s + strlen(s) - 6, ".local"))
 875       strlcat(s, ".", (size_t)slen);
 876   }
 877
 878  /*
 879   * Convert the hostname to lowercase as needed...
 880   */
 881
 882   if (s[0] != '/')
 883   {
 884     char        *ptr;                   /* Pointer into string */
 885
 886     for (ptr = s; *ptr; ptr ++)
 887       *ptr = (char)_cups_tolower((int)*ptr);
 888   }
 889
 890  /*
 891   * Return the hostname with as much domain info as we have...
 892   */
 893
 894   return (s);
 895 }
 896
 897
 898 /*
 899  * 'httpResolveHostname()' - Resolve the hostname of the HTTP connection
 900  *                           address.
 901  *
 902  * @since CUPS 2.0/OS 10.10@
 903  */
 904
 905 const char *                            /* O - Resolved hostname or @code NULL@ */
 906 httpResolveHostname(http_t *http,       /* I - HTTP connection */
 907                     char   *buffer,     /* I - Hostname buffer */
 908                     size_t bufsize)     /* I - Size of buffer */
 909 {
 910   if (!http)
 911     return (NULL);
 912
 913   if (isdigit(http->hostname[0] & 255) || http->hostname[0] == '[')
 914   {
 915     char        temp[1024];             /* Temporary string */
 916
 917     if (httpAddrLookup(http->hostaddr, temp, sizeof(temp)))
 918       strlcpy(http->hostname, temp, sizeof(http->hostname));
 919     else
 920       return (NULL);
 921   }
 922
 923   if (buffer)
 924   {
 925     if (http->hostname[0] == '/')
 926       strlcpy(buffer, "localhost", bufsize);
 927     else
 928       strlcpy(buffer, http->hostname, bufsize);
 929
 930     return (buffer);
 931   }
 932   else if (http->hostname[0] == '/')
 933     return ("localhost");
 934   else
 935     return (http->hostname);
 936 }