cups/ppd-util.c

   1 /*
   2  * PPD utilities for CUPS.
   3  *
   4  * Copyright © 2007-2018 by Apple Inc.
   5  * Copyright © 1997-2006 by Easy Software Products.
   6  *
   7  * Licensed under Apache License v2.0.  See the file "LICENSE" for more
   8  * information.
   9  */
  10
  11 /*
  12  * Include necessary headers...
  13  */
  14
  15 #include "cups-private.h"
  16 #include "ppd-private.h"
  17 #include <fcntl.h>
  18 #include <sys/stat.h>
  19 #if defined(WIN32) || defined(__EMX__)
  20 #  include <io.h>
  21 #else
  22 #  include <unistd.h>
  23 #endif /* WIN32 || __EMX__ */
  24
  25
  26 /*
  27  * Local functions...
  28  */
  29
  30 static int      cups_get_printer_uri(http_t *http, const char *name,
  31                                      char *host, int hostsize, int *port,
  32                                      char *resource, int resourcesize,
  33                                      int depth);
  34
  35
  36 /*
  37  * 'cupsGetPPD()' - Get the PPD file for a printer on the default server.
  38  *
  39  * For classes, @code cupsGetPPD@ returns the PPD file for the first printer
  40  * in the class.
  41  *
  42  * The returned filename is stored in a static buffer and is overwritten with
  43  * each call to @code cupsGetPPD@ or @link cupsGetPPD2@.  The caller "owns" the
  44  * file that is created and must @code unlink@ the returned filename.
  45  */
  46
  47 const char *                            /* O - Filename for PPD file */
  48 cupsGetPPD(const char *name)            /* I - Destination name */
  49 {
  50   _ppd_globals_t *pg = _ppdGlobals();   /* Pointer to library globals */
  51   time_t        modtime = 0;            /* Modification time */
  52
  53
  54  /*
  55   * Return the PPD file...
  56   */
  57
  58   pg->ppd_filename[0] = '\0';
  59
  60   if (cupsGetPPD3(CUPS_HTTP_DEFAULT, name, &modtime, pg->ppd_filename,
  61                   sizeof(pg->ppd_filename)) == HTTP_STATUS_OK)
  62     return (pg->ppd_filename);
  63   else
  64     return (NULL);
  65 }
  66
  67
  68 /*
  69  * 'cupsGetPPD2()' - Get the PPD file for a printer from the specified server.
  70  *
  71  * For classes, @code cupsGetPPD2@ returns the PPD file for the first printer
  72  * in the class.
  73  *
  74  * The returned filename is stored in a static buffer and is overwritten with
  75  * each call to @link cupsGetPPD@ or @code cupsGetPPD2@.  The caller "owns" the
  76  * file that is created and must @code unlink@ the returned filename.
  77  *
  78  * @since CUPS 1.1.21/macOS 10.4@
  79  */
  80
  81 const char *                            /* O - Filename for PPD file */
  82 cupsGetPPD2(http_t     *http,           /* I - Connection to server or @code CUPS_HTTP_DEFAULT@ */
  83             const char *name)           /* I - Destination name */
  84 {
  85   _ppd_globals_t *pg = _ppdGlobals();   /* Pointer to library globals */
  86   time_t        modtime = 0;            /* Modification time */
  87
  88
  89   pg->ppd_filename[0] = '\0';
  90
  91   if (cupsGetPPD3(http, name, &modtime, pg->ppd_filename,
  92                   sizeof(pg->ppd_filename)) == HTTP_STATUS_OK)
  93     return (pg->ppd_filename);
  94   else
  95     return (NULL);
  96 }
  97
  98
  99 /*
 100  * 'cupsGetPPD3()' - Get the PPD file for a printer on the specified
 101  *                   server if it has changed.
 102  *
 103  * The "modtime" parameter contains the modification time of any
 104  * locally-cached content and is updated with the time from the PPD file on
 105  * the server.
 106  *
 107  * The "buffer" parameter contains the local PPD filename.  If it contains
 108  * the empty string, a new temporary file is created, otherwise the existing
 109  * file will be overwritten as needed.  The caller "owns" the file that is
 110  * created and must @code unlink@ the returned filename.
 111  *
 112  * On success, @code HTTP_STATUS_OK@ is returned for a new PPD file and
 113  * @code HTTP_STATUS_NOT_MODIFIED@ if the existing PPD file is up-to-date.  Any other
 114  * status is an error.
 115  *
 116  * For classes, @code cupsGetPPD3@ returns the PPD file for the first printer
 117  * in the class.
 118  *
 119  * @since CUPS 1.4/macOS 10.6@
 120  */
 121
 122 http_status_t                           /* O  - HTTP status */
 123 cupsGetPPD3(http_t     *http,           /* I  - HTTP connection or @code CUPS_HTTP_DEFAULT@ */
 124             const char *name,           /* I  - Destination name */
 125             time_t     *modtime,        /* IO - Modification time */
 126             char       *buffer,         /* I  - Filename buffer */
 127             size_t     bufsize)         /* I  - Size of filename buffer */
 128 {
 129   int           http_port;              /* Port number */
 130   char          http_hostname[HTTP_MAX_HOST];
 131                                         /* Hostname associated with connection */
 132   http_t        *http2;                 /* Alternate HTTP connection */
 133   int           fd;                     /* PPD file */
 134   char          localhost[HTTP_MAX_URI],/* Local hostname */
 135                 hostname[HTTP_MAX_URI], /* Hostname */
 136                 resource[HTTP_MAX_URI]; /* Resource name */
 137   int           port;                   /* Port number */
 138   http_status_t status;                 /* HTTP status from server */
 139   char          tempfile[1024] = "";    /* Temporary filename */
 140   _cups_globals_t *cg = _cupsGlobals(); /* Pointer to library globals */
 141
 142
 143  /*
 144   * Range check input...
 145   */
 146
 147   DEBUG_printf(("cupsGetPPD3(http=%p, name=\"%s\", modtime=%p(%d), buffer=%p, "
 148                 "bufsize=%d)", http, name, modtime,
 149                 modtime ? (int)*modtime : 0, buffer, (int)bufsize));
 150
 151   if (!name)
 152   {
 153     DEBUG_puts("2cupsGetPPD3: No printer name, returning NULL.");
 154     _cupsSetError(IPP_STATUS_ERROR_INTERNAL, _("No printer name"), 1);
 155     return (HTTP_STATUS_NOT_ACCEPTABLE);
 156   }
 157
 158   if (!modtime)
 159   {
 160     DEBUG_puts("2cupsGetPPD3: No modtime, returning NULL.");
 161     _cupsSetError(IPP_STATUS_ERROR_INTERNAL, _("No modification time"), 1);
 162     return (HTTP_STATUS_NOT_ACCEPTABLE);
 163   }
 164
 165   if (!buffer || bufsize <= 1)
 166   {
 167     DEBUG_puts("2cupsGetPPD3: No filename buffer, returning NULL.");
 168     _cupsSetError(IPP_STATUS_ERROR_INTERNAL, _("Bad filename buffer"), 1);
 169     return (HTTP_STATUS_NOT_ACCEPTABLE);
 170   }
 171
 172 #ifndef WIN32
 173  /*
 174   * See if the PPD file is available locally...
 175   */
 176
 177   if (http)
 178     httpGetHostname(http, hostname, sizeof(hostname));
 179   else
 180   {
 181     strlcpy(hostname, cupsServer(), sizeof(hostname));
 182     if (hostname[0] == '/')
 183       strlcpy(hostname, "localhost", sizeof(hostname));
 184   }
 185
 186   if (!_cups_strcasecmp(hostname, "localhost"))
 187   {
 188     char        ppdname[1024];          /* PPD filename */
 189     struct stat ppdinfo;                /* PPD file information */
 190
 191
 192     snprintf(ppdname, sizeof(ppdname), "%s/ppd/%s.ppd", cg->cups_serverroot,
 193              name);
 194     if (!stat(ppdname, &ppdinfo) && !access(ppdname, R_OK))
 195     {
 196      /*
 197       * OK, the file exists and is readable, use it!
 198       */
 199
 200       if (buffer[0])
 201       {
 202         DEBUG_printf(("2cupsGetPPD3: Using filename \"%s\".", buffer));
 203
 204         unlink(buffer);
 205
 206         if (symlink(ppdname, buffer) && errno != EEXIST)
 207         {
 208           _cupsSetError(IPP_STATUS_ERROR_INTERNAL, NULL, 0);
 209
 210           return (HTTP_STATUS_SERVER_ERROR);
 211         }
 212       }
 213       else
 214       {
 215         int             tries;          /* Number of tries */
 216         const char      *tmpdir;        /* TMPDIR environment variable */
 217         struct timeval  curtime;        /* Current time */
 218
 219
 220 #ifdef __APPLE__
 221        /*
 222         * On macOS and iOS, the TMPDIR environment variable is not always the best
 223         * location to place temporary files due to sandboxing.  Instead, the confstr
 224         * function should be called to get the proper per-user, per-process TMPDIR
 225         * value.  Currently this only happens if TMPDIR is not set or is set to
 226         * "/Users/...".
 227         */
 228
 229         char            tmppath[1024];  /* Temporary directory */
 230
 231         if ((tmpdir = getenv("TMPDIR")) != NULL && !strncmp(tmpdir, "/Users/", 7)))
 232           tmpdir = NULL;
 233
 234         if (!tmpdir)
 235         {
 236           if (confstr(_CS_DARWIN_USER_TEMP_DIR, tmppath, sizeof(tmppath)))
 237             tmpdir = tmppath;
 238           else
 239             tmpdir = "/private/tmp";            /* This should never happen */
 240         }
 241 #else
 242        /*
 243         * Previously we put root temporary files in the default CUPS temporary
 244         * directory under /var/spool/cups.  However, since the scheduler cleans
 245         * out temporary files there and runs independently of the user apps, we
 246         * don't want to use it unless specifically told to by cupsd.
 247         */
 248
 249         if ((tmpdir = getenv("TMPDIR")) == NULL)
 250           tmpdir = "/tmp";
 251 #endif /* __APPLE__ */
 252
 253         DEBUG_printf(("2cupsGetPPD3: tmpdir=\"%s\".", tmpdir));
 254
 255        /*
 256         * Make the temporary name using the specified directory...
 257         */
 258
 259         tries = 0;
 260
 261         do
 262         {
 263          /*
 264           * Get the current time of day...
 265           */
 266
 267           gettimeofday(&curtime, NULL);
 268
 269          /*
 270           * Format a string using the hex time values...
 271           */
 272
 273           snprintf(buffer, bufsize, "%s/%08lx%05lx", tmpdir,
 274                    (unsigned long)curtime.tv_sec,
 275                    (unsigned long)curtime.tv_usec);
 276
 277          /*
 278           * Try to make a symlink...
 279           */
 280
 281           if (!symlink(ppdname, buffer))
 282             break;
 283
 284           DEBUG_printf(("2cupsGetPPD3: Symlink \"%s\" to \"%s\" failed: %s", ppdname, buffer, strerror(errno)));
 285
 286           tries ++;
 287         }
 288         while (tries < 1000);
 289
 290         if (tries >= 1000)
 291         {
 292           DEBUG_puts("2cupsGetPPD3: Unable to symlink after 1000 tries, returning error.");
 293
 294           _cupsSetError(IPP_STATUS_ERROR_INTERNAL, NULL, 0);
 295
 296           return (HTTP_STATUS_SERVER_ERROR);
 297         }
 298       }
 299
 300       if (*modtime >= ppdinfo.st_mtime)
 301       {
 302         DEBUG_printf(("2cupsGetPPD3: Returning not-modified, filename=\"%s\".", buffer));
 303         return (HTTP_STATUS_NOT_MODIFIED);
 304       }
 305       else
 306       {
 307         DEBUG_printf(("2cupsGetPPD3: Returning ok, filename=\"%s\", modtime=%ld.", buffer, (long)ppdinfo.st_mtime));
 308         *modtime = ppdinfo.st_mtime;
 309         return (HTTP_STATUS_OK);
 310       }
 311     }
 312   }
 313 #endif /* !WIN32 */
 314
 315  /*
 316   * Try finding a printer URI for this printer...
 317   */
 318
 319   DEBUG_puts("2cupsGetPPD3: Unable to access local file, copying...");
 320
 321   if (!http)
 322   {
 323     if ((http = _cupsConnect()) == NULL)
 324     {
 325       DEBUG_puts("2cupsGetPPD3: Unable to connect to scheduler.");
 326       return (HTTP_STATUS_SERVICE_UNAVAILABLE);
 327     }
 328   }
 329
 330   if (!cups_get_printer_uri(http, name, hostname, sizeof(hostname), &port, resource, sizeof(resource), 0))
 331   {
 332     DEBUG_puts("2cupsGetPPD3: Unable to get printer URI.");
 333     return (HTTP_STATUS_NOT_FOUND);
 334   }
 335
 336   DEBUG_printf(("2cupsGetPPD3: Printer hostname=\"%s\", port=%d", hostname, port));
 337
 338   if (cupsServer()[0] == '/' && !_cups_strcasecmp(hostname, "localhost") && port == ippPort())
 339   {
 340    /*
 341     * Redirect localhost to domain socket...
 342     */
 343
 344     strlcpy(hostname, cupsServer(), sizeof(hostname));
 345     port = 0;
 346
 347     DEBUG_printf(("2cupsGetPPD3: Redirecting to \"%s\".", hostname));
 348   }
 349
 350  /*
 351   * Remap local hostname to localhost...
 352   */
 353
 354   httpGetHostname(NULL, localhost, sizeof(localhost));
 355
 356   DEBUG_printf(("2cupsGetPPD3: Local hostname=\"%s\"", localhost));
 357
 358   if (!_cups_strcasecmp(localhost, hostname))
 359     strlcpy(hostname, "localhost", sizeof(hostname));
 360
 361  /*
 362   * Get the hostname and port number we are connected to...
 363   */
 364
 365   httpGetHostname(http, http_hostname, sizeof(http_hostname));
 366   http_port = httpAddrPort(http->hostaddr);
 367
 368   DEBUG_printf(("2cupsGetPPD3: Connection hostname=\"%s\", port=%d",
 369                 http_hostname, http_port));
 370
 371  /*
 372   * Reconnect to the correct server as needed...
 373   */
 374
 375   if (!_cups_strcasecmp(http_hostname, hostname) && port == http_port)
 376     http2 = http;
 377   else if ((http2 = httpConnect2(hostname, port, NULL, AF_UNSPEC,
 378                                  cupsEncryption(), 1, 30000, NULL)) == NULL)
 379   {
 380     DEBUG_puts("2cupsGetPPD3: Unable to connect to server");
 381
 382     return (HTTP_STATUS_SERVICE_UNAVAILABLE);
 383   }
 384
 385  /*
 386   * Get a temp file...
 387   */
 388
 389   if (buffer[0])
 390     fd = open(buffer, O_CREAT | O_TRUNC | O_WRONLY, 0600);
 391   else
 392     fd = cupsTempFd(tempfile, sizeof(tempfile));
 393
 394   if (fd < 0)
 395   {
 396    /*
 397     * Can't open file; close the server connection and return NULL...
 398     */
 399
 400     _cupsSetError(IPP_STATUS_ERROR_INTERNAL, NULL, 0);
 401
 402     if (http2 != http)
 403       httpClose(http2);
 404
 405     return (HTTP_STATUS_SERVER_ERROR);
 406   }
 407
 408  /*
 409   * And send a request to the HTTP server...
 410   */
 411
 412   strlcat(resource, ".ppd", sizeof(resource));
 413
 414   if (*modtime > 0)
 415     httpSetField(http2, HTTP_FIELD_IF_MODIFIED_SINCE,
 416                  httpGetDateString(*modtime));
 417
 418   status = cupsGetFd(http2, resource, fd);
 419
 420   close(fd);
 421
 422  /*
 423   * See if we actually got the file or an error...
 424   */
 425
 426   if (status == HTTP_STATUS_OK)
 427   {
 428     *modtime = httpGetDateTime(httpGetField(http2, HTTP_FIELD_DATE));
 429
 430     if (tempfile[0])
 431       strlcpy(buffer, tempfile, bufsize);
 432   }
 433   else if (status != HTTP_STATUS_NOT_MODIFIED)
 434   {
 435     _cupsSetHTTPError(status);
 436
 437     if (buffer[0])
 438       unlink(buffer);
 439     else if (tempfile[0])
 440       unlink(tempfile);
 441   }
 442   else if (tempfile[0])
 443     unlink(tempfile);
 444
 445   if (http2 != http)
 446     httpClose(http2);
 447
 448  /*
 449   * Return the PPD file...
 450   */
 451
 452   DEBUG_printf(("2cupsGetPPD3: Returning status %d", status));
 453
 454   return (status);
 455 }
 456
 457
 458 /*
 459  * 'cupsGetServerPPD()' - Get an available PPD file from the server.
 460  *
 461  * This function returns the named PPD file from the server.  The
 462  * list of available PPDs is provided by the IPP @code CUPS_GET_PPDS@
 463  * operation.
 464  *
 465  * You must remove (unlink) the PPD file when you are finished with
 466  * it. The PPD filename is stored in a static location that will be
 467  * overwritten on the next call to @link cupsGetPPD@, @link cupsGetPPD2@,
 468  * or @link cupsGetServerPPD@.
 469  *
 470  * @since CUPS 1.3/macOS 10.5@
 471  */
 472
 473 char *                                  /* O - Name of PPD file or @code NULL@ on error */
 474 cupsGetServerPPD(http_t     *http,      /* I - Connection to server or @code CUPS_HTTP_DEFAULT@ */
 475                  const char *name)      /* I - Name of PPD file ("ppd-name") */
 476 {
 477   int                   fd;             /* PPD file descriptor */
 478   ipp_t                 *request;       /* IPP request */
 479   _ppd_globals_t        *pg = _ppdGlobals();
 480                                         /* Pointer to library globals */
 481
 482
 483  /*
 484   * Range check input...
 485   */
 486
 487   if (!name)
 488   {
 489     _cupsSetError(IPP_STATUS_ERROR_INTERNAL, _("No PPD name"), 1);
 490
 491     return (NULL);
 492   }
 493
 494   if (!http)
 495     if ((http = _cupsConnect()) == NULL)
 496       return (NULL);
 497
 498  /*
 499   * Get a temp file...
 500   */
 501
 502   if ((fd = cupsTempFd(pg->ppd_filename, sizeof(pg->ppd_filename))) < 0)
 503   {
 504    /*
 505     * Can't open file; close the server connection and return NULL...
 506     */
 507
 508     _cupsSetError(IPP_STATUS_ERROR_INTERNAL, NULL, 0);
 509
 510     return (NULL);
 511   }
 512
 513  /*
 514   * Get the PPD file...
 515   */
 516
 517   request = ippNewRequest(IPP_OP_CUPS_GET_PPD);
 518   ippAddString(request, IPP_TAG_OPERATION, IPP_TAG_NAME, "ppd-name", NULL,
 519                name);
 520
 521   ippDelete(cupsDoIORequest(http, request, "/", -1, fd));
 522
 523   close(fd);
 524
 525   if (cupsLastError() != IPP_STATUS_OK)
 526   {
 527     unlink(pg->ppd_filename);
 528     return (NULL);
 529   }
 530   else
 531     return (pg->ppd_filename);
 532 }
 533
 534
 535 /*
 536  * 'cups_get_printer_uri()' - Get the printer-uri-supported attribute for the
 537  *                            first printer in a class.
 538  */
 539
 540 static int                              /* O - 1 on success, 0 on failure */
 541 cups_get_printer_uri(
 542     http_t     *http,                   /* I - Connection to server */
 543     const char *name,                   /* I - Name of printer or class */
 544     char       *host,                   /* I - Hostname buffer */
 545     int        hostsize,                /* I - Size of hostname buffer */
 546     int        *port,                   /* O - Port number */
 547     char       *resource,               /* I - Resource buffer */
 548     int        resourcesize,            /* I - Size of resource buffer */
 549     int        depth)                   /* I - Depth of query */
 550 {
 551   int           i;                      /* Looping var */
 552   int           http_port;              /* Port number */
 553   http_t        *http2;                 /* Alternate HTTP connection */
 554   ipp_t         *request,               /* IPP request */
 555                 *response;              /* IPP response */
 556   ipp_attribute_t *attr;                /* Current attribute */
 557   char          uri[HTTP_MAX_URI],      /* printer-uri attribute */
 558                 scheme[HTTP_MAX_URI],   /* Scheme name */
 559                 username[HTTP_MAX_URI], /* Username:password */
 560                 classname[255],         /* Temporary class name */
 561                 http_hostname[HTTP_MAX_HOST];
 562                                         /* Hostname associated with connection */
 563   static const char * const requested_attrs[] =
 564                 {                       /* Requested attributes */
 565                   "device-uri",
 566                   "member-uris",
 567                   "printer-uri-supported",
 568                   "printer-type"
 569                 };
 570
 571
 572   DEBUG_printf(("4cups_get_printer_uri(http=%p, name=\"%s\", host=%p, hostsize=%d, resource=%p, resourcesize=%d, depth=%d)", http, name, host, hostsize, resource, resourcesize, depth));
 573
 574  /*
 575   * Setup the printer URI...
 576   */
 577
 578   if (httpAssembleURIf(HTTP_URI_CODING_ALL, uri, sizeof(uri), "ipp", NULL, "localhost", 0, "/printers/%s", name) < HTTP_URI_STATUS_OK)
 579   {
 580     _cupsSetError(IPP_STATUS_ERROR_INTERNAL, _("Unable to create printer-uri"), 1);
 581
 582     *host     = '\0';
 583     *resource = '\0';
 584
 585     return (0);
 586   }
 587
 588   DEBUG_printf(("5cups_get_printer_uri: printer-uri=\"%s\"", uri));
 589
 590  /*
 591   * Get the hostname and port number we are connected to...
 592   */
 593
 594   httpGetHostname(http, http_hostname, sizeof(http_hostname));
 595   http_port = httpAddrPort(http->hostaddr);
 596
 597   DEBUG_printf(("5cups_get_printer_uri: http_hostname=\"%s\"", http_hostname));
 598
 599  /*
 600   * Build an IPP_GET_PRINTER_ATTRIBUTES request, which requires the following
 601   * attributes:
 602   *
 603   *    attributes-charset
 604   *    attributes-natural-language
 605   *    printer-uri
 606   *    requested-attributes
 607   */
 608
 609   request = ippNewRequest(IPP_OP_GET_PRINTER_ATTRIBUTES);
 610
 611   ippAddString(request, IPP_TAG_OPERATION, IPP_TAG_URI, "printer-uri", NULL, uri);
 612
 613   ippAddStrings(request, IPP_TAG_OPERATION, IPP_TAG_KEYWORD, "requested-attributes", sizeof(requested_attrs) / sizeof(requested_attrs[0]), NULL, requested_attrs);
 614
 615  /*
 616   * Do the request and get back a response...
 617   */
 618
 619   snprintf(resource, (size_t)resourcesize, "/printers/%s", name);
 620
 621   if ((response = cupsDoRequest(http, request, resource)) != NULL)
 622   {
 623     const char *device_uri = NULL;      /* device-uri value */
 624
 625     if ((attr = ippFindAttribute(response, "device-uri", IPP_TAG_URI)) != NULL)
 626     {
 627       device_uri = attr->values[0].string.text;
 628       DEBUG_printf(("5cups_get_printer_uri: device-uri=\"%s\"", device_uri));
 629     }
 630
 631     if (device_uri &&
 632         (((!strncmp(device_uri, "ipp://", 6) || !strncmp(device_uri, "ipps://", 7)) &&
 633           (strstr(device_uri, "/printers/") != NULL || strstr(device_uri, "/classes/") != NULL)) ||
 634          ((strstr(device_uri, "._ipp.") != NULL || strstr(device_uri, "._ipps.") != NULL) &&
 635           !strcmp(device_uri + strlen(device_uri) - 5, "/cups"))))
 636     {
 637      /*
 638       * Statically-configured shared printer.
 639       */
 640
 641       httpSeparateURI(HTTP_URI_CODING_ALL, _httpResolveURI(device_uri, uri, sizeof(uri), _HTTP_RESOLVE_DEFAULT, NULL, NULL), scheme, sizeof(scheme), username, sizeof(username), host, hostsize, port, resource, resourcesize);
 642       ippDelete(response);
 643
 644       DEBUG_printf(("5cups_get_printer_uri: Resolved to host=\"%s\", port=%d, resource=\"%s\"", host, *port, resource));
 645       return (1);
 646     }
 647     else if ((attr = ippFindAttribute(response, "member-uris", IPP_TAG_URI)) != NULL)
 648     {
 649      /*
 650       * Get the first actual printer name in the class...
 651       */
 652
 653       DEBUG_printf(("5cups_get_printer_uri: Got member-uris with %d values.", ippGetCount(attr)));
 654
 655       for (i = 0; i < attr->num_values; i ++)
 656       {
 657         DEBUG_printf(("5cups_get_printer_uri: member-uris[%d]=\"%s\"", i, ippGetString(attr, i, NULL)));
 658
 659         httpSeparateURI(HTTP_URI_CODING_ALL, attr->values[i].string.text, scheme, sizeof(scheme), username, sizeof(username), host, hostsize, port, resource, resourcesize);
 660         if (!strncmp(resource, "/printers/", 10))
 661         {
 662          /*
 663           * Found a printer!
 664           */
 665
 666           ippDelete(response);
 667
 668           DEBUG_printf(("5cups_get_printer_uri: Found printer member with host=\"%s\", port=%d, resource=\"%s\"", host, *port, resource));
 669           return (1);
 670         }
 671       }
 672
 673      /*
 674       * No printers in this class - try recursively looking for a printer,
 675       * but not more than 3 levels deep...
 676       */
 677
 678       if (depth < 3)
 679       {
 680         for (i = 0; i < attr->num_values; i ++)
 681         {
 682           httpSeparateURI(HTTP_URI_CODING_ALL, attr->values[i].string.text,
 683                           scheme, sizeof(scheme), username, sizeof(username),
 684                           host, hostsize, port, resource, resourcesize);
 685           if (!strncmp(resource, "/classes/", 9))
 686           {
 687            /*
 688             * Found a class!  Connect to the right server...
 689             */
 690
 691             if (!_cups_strcasecmp(http_hostname, host) && *port == http_port)
 692               http2 = http;
 693             else if ((http2 = httpConnect2(host, *port, NULL, AF_UNSPEC, cupsEncryption(), 1, 30000, NULL)) == NULL)
 694             {
 695               DEBUG_puts("8cups_get_printer_uri: Unable to connect to server");
 696
 697               continue;
 698             }
 699
 700            /*
 701             * Look up printers on that server...
 702             */
 703
 704             strlcpy(classname, resource + 9, sizeof(classname));
 705
 706             cups_get_printer_uri(http2, classname, host, hostsize, port,
 707                                  resource, resourcesize, depth + 1);
 708
 709            /*
 710             * Close the connection as needed...
 711             */
 712
 713             if (http2 != http)
 714               httpClose(http2);
 715
 716             if (*host)
 717               return (1);
 718           }
 719         }
 720       }
 721     }
 722     else if ((attr = ippFindAttribute(response, "printer-uri-supported", IPP_TAG_URI)) != NULL)
 723     {
 724       httpSeparateURI(HTTP_URI_CODING_ALL, _httpResolveURI(attr->values[0].string.text, uri, sizeof(uri), _HTTP_RESOLVE_DEFAULT, NULL, NULL), scheme, sizeof(scheme), username, sizeof(username), host, hostsize, port, resource, resourcesize);
 725       ippDelete(response);
 726
 727       DEBUG_printf(("5cups_get_printer_uri: Resolved to host=\"%s\", port=%d, resource=\"%s\"", host, *port, resource));
 728
 729       if (!strncmp(resource, "/classes/", 9))
 730       {
 731         _cupsSetError(IPP_STATUS_ERROR_INTERNAL, _("No printer-uri found for class"), 1);
 732
 733         *host     = '\0';
 734         *resource = '\0';
 735
 736         DEBUG_puts("5cups_get_printer_uri: Not returning class.");
 737         return (0);
 738       }
 739
 740       return (1);
 741     }
 742
 743     ippDelete(response);
 744   }
 745
 746   if (cupsLastError() != IPP_STATUS_ERROR_NOT_FOUND)
 747     _cupsSetError(IPP_STATUS_ERROR_INTERNAL, _("No printer-uri found"), 1);
 748
 749   *host     = '\0';
 750   *resource = '\0';
 751
 752   DEBUG_puts("5cups_get_printer_uri: Printer URI not found.");
 753   return (0);
 754 }