예제 #1
0
static void 
_post_send (GtkCupsRequest *request)
{
  gchar length[255];
  struct stat data_info;

  GTK_NOTE (PRINTING,
            g_print ("CUPS Backend: %s\n", G_STRFUNC));

  request->poll_state = GTK_CUPS_HTTP_WRITE;

  if (request->data_io != NULL)
    {
      fstat (g_io_channel_unix_get_fd (request->data_io), &data_info);
      sprintf (length, "%lu", (unsigned long) (ippLength (request->ipp_request) + data_info.st_size));
    }
  else
    sprintf (length, "%lu", (unsigned long) ippLength (request->ipp_request));
	
  httpClearFields (request->http);
  httpSetField (request->http, HTTP_FIELD_CONTENT_LENGTH, length);
  httpSetField (request->http, HTTP_FIELD_CONTENT_TYPE, "application/ipp");
#ifdef HAVE_HTTPGETAUTHSTRING
  httpSetField (request->http, HTTP_FIELD_AUTHORIZATION, httpGetAuthString (request->http));
#else
#ifdef HAVE_HTTP_AUTHSTRING
  httpSetField (request->http, HTTP_FIELD_AUTHORIZATION, request->http->authstring);
#endif
#endif

  if (httpPost (request->http, request->resource))
    {
      if (httpReconnect (request->http))
        {
          request->state = GTK_CUPS_POST_DONE;
          request->poll_state = GTK_CUPS_HTTP_IDLE;

          /* TODO: should add a status or error code for failed post */
          gtk_cups_result_set_error (request->result,
                                     GTK_CUPS_ERROR_GENERAL,
                                     0,
                                     0,
                                     "Failed Post");
        }

      request->attempts++;
      return;    
    }
        
    request->attempts = 0;

    request->state = GTK_CUPS_POST_WRITE_REQUEST;
    ippSetState (request->ipp_request, IPP_IDLE);
}
예제 #2
0
파일: request.c 프로젝트: jelmer/cups
ipp_t *					/* O - Response data */
cupsDoIORequest(http_t     *http,	/* I - Connection to server or @code CUPS_HTTP_DEFAULT@ */
                ipp_t      *request,	/* I - IPP request */
                const char *resource,	/* I - HTTP resource for POST */
		int        infile,	/* I - File to read from or -1 for none */
		int        outfile)	/* I - File to write to or -1 for none */
{
  ipp_t		*response = NULL;	/* IPP response data */
  size_t	length = 0;		/* Content-Length value */
  http_status_t	status;			/* Status of HTTP request */
  struct stat	fileinfo;		/* File information */
  int		bytes;			/* Number of bytes read/written */
  char		buffer[32768];		/* Output buffer */


  DEBUG_printf(("cupsDoIORequest(http=%p, request=%p(%s), resource=\"%s\", "
                "infile=%d, outfile=%d)", http, request,
		request ? ippOpString(request->request.op.operation_id) : "?",
		resource, infile, outfile));

 /*
  * Range check input...
  */

  if (!request || !resource)
  {
    ippDelete(request);

    _cupsSetError(IPP_STATUS_ERROR_INTERNAL, strerror(EINVAL), 0);

    return (NULL);
  }

 /*
  * Get the default connection as needed...
  */

  if (!http)
    if ((http = _cupsConnect()) == NULL)
    {
      ippDelete(request);

      return (NULL);
    }

 /*
  * See if we have a file to send...
  */

  if (infile >= 0)
  {
    if (fstat(infile, &fileinfo))
    {
     /*
      * Can't get file information!
      */

      _cupsSetError(errno == EBADF ? IPP_STATUS_ERROR_NOT_FOUND : IPP_STATUS_ERROR_NOT_AUTHORIZED,
                    NULL, 0);

      ippDelete(request);

      return (NULL);
    }

#ifdef WIN32
    if (fileinfo.st_mode & _S_IFDIR)
#else
    if (S_ISDIR(fileinfo.st_mode))
#endif /* WIN32 */
    {
     /*
      * Can't send a directory...
      */

      ippDelete(request);

      _cupsSetError(IPP_STATUS_ERROR_NOT_POSSIBLE, strerror(EISDIR), 0);

      return (NULL);
    }

#ifndef WIN32
    if (!S_ISREG(fileinfo.st_mode))
      length = 0;			/* Chunk when piping */
    else
#endif /* !WIN32 */
    length = ippLength(request) + fileinfo.st_size;
  }
  else
    length = ippLength(request);

  DEBUG_printf(("2cupsDoIORequest: Request length=%ld, total length=%ld",
                (long)ippLength(request), (long)length));

 /*
  * Clear any "Local" authentication data since it is probably stale...
  */

  if (http->authstring && !strncmp(http->authstring, "Local ", 6))
    httpSetAuthString(http, NULL, NULL);

 /*
  * Loop until we can send the request without authorization problems.
  */

  while (response == NULL)
  {
    DEBUG_puts("2cupsDoIORequest: setup...");

   /*
    * Send the request...
    */

    status = cupsSendRequest(http, request, resource, length);

    DEBUG_printf(("2cupsDoIORequest: status=%d", status));

    if (status == HTTP_STATUS_CONTINUE && request->state == IPP_STATE_DATA && infile >= 0)
    {
      DEBUG_puts("2cupsDoIORequest: file write...");

     /*
      * Send the file with the request...
      */

#ifndef WIN32
      if (S_ISREG(fileinfo.st_mode))
#endif /* WIN32 */
      lseek(infile, 0, SEEK_SET);

      while ((bytes = (int)read(infile, buffer, sizeof(buffer))) > 0)
      {
        if ((status = cupsWriteRequestData(http, buffer, bytes))
                != HTTP_STATUS_CONTINUE)
	  break;
      }
    }

   /*
    * Get the server's response...
    */

    if (status != HTTP_STATUS_ERROR)
    {
      response = cupsGetResponse(http, resource);
      status   = httpGetStatus(http);
    }

    DEBUG_printf(("2cupsDoIORequest: status=%d", status));

    if (status == HTTP_STATUS_ERROR ||
        (status >= HTTP_STATUS_BAD_REQUEST && status != HTTP_STATUS_UNAUTHORIZED &&
	 status != HTTP_STATUS_UPGRADE_REQUIRED))
    {
      _cupsSetHTTPError(status);
      break;
    }

    if (response && outfile >= 0)
    {
     /*
      * Write trailing data to file...
      */

      while ((bytes = (int)httpRead2(http, buffer, sizeof(buffer))) > 0)
	if (write(outfile, buffer, bytes) < bytes)
	  break;
    }

    if (http->state != HTTP_STATE_WAITING)
    {
     /*
      * Flush any remaining data...
      */

      httpFlush(http);
    }
  }

 /*
  * Delete the original request and return the response...
  */

  ippDelete(request);

  return (response);
}
예제 #3
0
파일: testipp.c 프로젝트: lanceit/cups
int				/* O - Exit status */
main(int  argc,			/* I - Number of command-line arguments */
     char *argv[])		/* I - Command-line arguments */
{
  _ippdata_t	data;		/* IPP buffer */
  ipp_uchar_t	buffer[8192];	/* Write buffer data */
  ipp_t		*cols[2],	/* Collections */
		*size;		/* media-size collection */
  ipp_t		*request;	/* Request */
  ipp_attribute_t *media_col,	/* media-col attribute */
		*media_size,	/* media-size attribute */
		*attr;		/* Other attribute */
  ipp_state_t	state;		/* State */
  size_t	length;		/* Length of data */
  cups_file_t	*fp;		/* File pointer */
  size_t	i;		/* Looping var */
  int		status;		/* Status of tests (0 = success, 1 = fail) */
#ifdef DEBUG
  const char	*name;		/* Option name */
#endif /* DEBUG */


  status = 0;

  if (argc == 1)
  {
   /*
    * Test request generation code...
    */

    printf("Create Sample Request: ");

    request = ippNew();
    request->request.op.version[0]   = 0x01;
    request->request.op.version[1]   = 0x01;
    request->request.op.operation_id = IPP_OP_PRINT_JOB;
    request->request.op.request_id   = 1;

    ippAddString(request, IPP_TAG_OPERATION, IPP_TAG_CHARSET,
        	 "attributes-charset", NULL, "utf-8");
    ippAddString(request, IPP_TAG_OPERATION, IPP_TAG_LANGUAGE,
        	 "attributes-natural-language", NULL, "en");
    ippAddString(request, IPP_TAG_OPERATION, IPP_TAG_URI,
        	 "printer-uri", NULL, "ipp://localhost/printers/foo");

    cols[0] = ippNew();
    size    = ippNew();
    ippAddInteger(size, IPP_TAG_ZERO, IPP_TAG_INTEGER, "x-dimension", 21590);
    ippAddInteger(size, IPP_TAG_ZERO, IPP_TAG_INTEGER, "y-dimension", 27940);
    ippAddCollection(cols[0], IPP_TAG_JOB, "media-size", size);
    ippDelete(size);
    ippAddString(cols[0], IPP_TAG_JOB, IPP_TAG_KEYWORD, "media-color", NULL,
                 "blue");
    ippAddString(cols[0], IPP_TAG_JOB, IPP_TAG_KEYWORD, "media-type", NULL,
                 "plain");

    cols[1] = ippNew();
    size    = ippNew();
    ippAddInteger(size, IPP_TAG_ZERO, IPP_TAG_INTEGER, "x-dimension", 21000);
    ippAddInteger(size, IPP_TAG_ZERO, IPP_TAG_INTEGER, "y-dimension", 29700);
    ippAddCollection(cols[1], IPP_TAG_JOB, "media-size", size);
    ippDelete(size);
    ippAddString(cols[1], IPP_TAG_JOB, IPP_TAG_KEYWORD, "media-color", NULL,
                 "plaid");
    ippAddString(cols[1], IPP_TAG_JOB, IPP_TAG_KEYWORD, "media-type", NULL,
		 "glossy");

    ippAddCollections(request, IPP_TAG_JOB, "media-col", 2,
                      (const ipp_t **)cols);
    ippDelete(cols[0]);
    ippDelete(cols[1]);

    length = ippLength(request);
    if (length != sizeof(collection))
    {
      printf("FAIL - wrong ippLength(), %d instead of %d bytes!\n",
             (int)length, (int)sizeof(collection));
      status = 1;
    }
    else
      puts("PASS");

   /*
    * Write test #1...
    */

    printf("Write Sample to Memory: ");

    data.wused   = 0;
    data.wsize   = sizeof(buffer);
    data.wbuffer = buffer;

    while ((state = ippWriteIO(&data, (ipp_iocb_t)write_cb, 1, NULL,
                               request)) != IPP_STATE_DATA)
      if (state == IPP_STATE_ERROR)
	break;

    if (state != IPP_STATE_DATA)
    {
      printf("FAIL - %d bytes written.\n", (int)data.wused);
      status = 1;
    }
    else if (data.wused != sizeof(collection))
    {
      printf("FAIL - wrote %d bytes, expected %d bytes!\n", (int)data.wused,
             (int)sizeof(collection));
      hex_dump("Bytes Written", data.wbuffer, data.wused);
      hex_dump("Baseline", collection, sizeof(collection));
      status = 1;
    }
    else if (memcmp(data.wbuffer, collection, data.wused))
    {
      for (i = 0; i < data.wused; i ++)
        if (data.wbuffer[i] != collection[i])
	  break;

      printf("FAIL - output does not match baseline at 0x%04x!\n", (unsigned)i);
      hex_dump("Bytes Written", data.wbuffer, data.wused);
      hex_dump("Baseline", collection, sizeof(collection));
      status = 1;
    }
    else
      puts("PASS");

    ippDelete(request);

   /*
    * Read the data back in and confirm...
    */

    printf("Read Sample from Memory: ");

    request     = ippNew();
    data.rpos = 0;

    while ((state = ippReadIO(&data, (ipp_iocb_t)read_cb, 1, NULL,
                              request)) != IPP_STATE_DATA)
      if (state == IPP_STATE_ERROR)
	break;

    length = ippLength(request);

    if (state != IPP_STATE_DATA)
    {
      printf("FAIL - %d bytes read.\n", (int)data.rpos);
      status = 1;
    }
    else if (data.rpos != data.wused)
    {
      printf("FAIL - read %d bytes, expected %d bytes!\n", (int)data.rpos,
             (int)data.wused);
      print_attributes(request, 8);
      status = 1;
    }
    else if (length != sizeof(collection))
    {
      printf("FAIL - wrong ippLength(), %d instead of %d bytes!\n",
             (int)length, (int)sizeof(collection));
      print_attributes(request, 8);
      status = 1;
    }
    else
      puts("PASS");

    fputs("ippFindAttribute(media-col): ", stdout);
    if ((media_col = ippFindAttribute(request, "media-col",
                                      IPP_TAG_BEGIN_COLLECTION)) == NULL)
    {
      if ((media_col = ippFindAttribute(request, "media-col",
                                        IPP_TAG_ZERO)) == NULL)
        puts("FAIL (not found)");
      else
        printf("FAIL (wrong type - %s)\n", ippTagString(media_col->value_tag));

      status = 1;
    }
    else if (media_col->num_values != 2)
    {
      printf("FAIL (wrong count - %d)\n", media_col->num_values);
      status = 1;
    }
    else
      puts("PASS");

    if (media_col)
    {
      fputs("ippFindAttribute(media-size 1): ", stdout);
      if ((media_size = ippFindAttribute(media_col->values[0].collection,
					 "media-size",
					 IPP_TAG_BEGIN_COLLECTION)) == NULL)
      {
	if ((media_size = ippFindAttribute(media_col->values[0].collection,
					   "media-col",
					   IPP_TAG_ZERO)) == NULL)
	  puts("FAIL (not found)");
	else
	  printf("FAIL (wrong type - %s)\n",
	         ippTagString(media_size->value_tag));

	status = 1;
      }
      else
      {
	if ((attr = ippFindAttribute(media_size->values[0].collection,
				     "x-dimension", IPP_TAG_INTEGER)) == NULL)
	{
	  if ((attr = ippFindAttribute(media_size->values[0].collection,
				       "x-dimension", IPP_TAG_ZERO)) == NULL)
	    puts("FAIL (missing x-dimension)");
	  else
	    printf("FAIL (wrong type for x-dimension - %s)\n",
		   ippTagString(attr->value_tag));

	  status = 1;
	}
	else if (attr->values[0].integer != 21590)
	{
	  printf("FAIL (wrong value for x-dimension - %d)\n",
		 attr->values[0].integer);
	  status = 1;
	}
	else if ((attr = ippFindAttribute(media_size->values[0].collection,
					  "y-dimension",
					  IPP_TAG_INTEGER)) == NULL)
	{
	  if ((attr = ippFindAttribute(media_size->values[0].collection,
				       "y-dimension", IPP_TAG_ZERO)) == NULL)
	    puts("FAIL (missing y-dimension)");
	  else
	    printf("FAIL (wrong type for y-dimension - %s)\n",
		   ippTagString(attr->value_tag));

	  status = 1;
	}
	else if (attr->values[0].integer != 27940)
	{
	  printf("FAIL (wrong value for y-dimension - %d)\n",
		 attr->values[0].integer);
	  status = 1;
	}
	else
	  puts("PASS");
      }

      fputs("ippFindAttribute(media-size 2): ", stdout);
      if ((media_size = ippFindAttribute(media_col->values[1].collection,
					 "media-size",
					 IPP_TAG_BEGIN_COLLECTION)) == NULL)
      {
	if ((media_size = ippFindAttribute(media_col->values[1].collection,
					   "media-col",
					   IPP_TAG_ZERO)) == NULL)
	  puts("FAIL (not found)");
	else
	  printf("FAIL (wrong type - %s)\n",
	         ippTagString(media_size->value_tag));

	status = 1;
      }
      else
      {
	if ((attr = ippFindAttribute(media_size->values[0].collection,
				     "x-dimension",
				     IPP_TAG_INTEGER)) == NULL)
	{
	  if ((attr = ippFindAttribute(media_size->values[0].collection,
				       "x-dimension", IPP_TAG_ZERO)) == NULL)
	    puts("FAIL (missing x-dimension)");
	  else
	    printf("FAIL (wrong type for x-dimension - %s)\n",
		   ippTagString(attr->value_tag));

	  status = 1;
	}
	else if (attr->values[0].integer != 21000)
	{
	  printf("FAIL (wrong value for x-dimension - %d)\n",
		 attr->values[0].integer);
	  status = 1;
	}
	else if ((attr = ippFindAttribute(media_size->values[0].collection,
					  "y-dimension",
					  IPP_TAG_INTEGER)) == NULL)
	{
	  if ((attr = ippFindAttribute(media_size->values[0].collection,
				       "y-dimension", IPP_TAG_ZERO)) == NULL)
	    puts("FAIL (missing y-dimension)");
	  else
	    printf("FAIL (wrong type for y-dimension - %s)\n",
		   ippTagString(attr->value_tag));

	  status = 1;
	}
	else if (attr->values[0].integer != 29700)
	{
	  printf("FAIL (wrong value for y-dimension - %d)\n",
		 attr->values[0].integer);
	  status = 1;
	}
	else
	  puts("PASS");
      }
    }

   /*
    * Test hierarchical find...
    */

    fputs("ippFindAttribute(media-col/media-size/x-dimension): ", stdout);
    if ((attr = ippFindAttribute(request, "media-col/media-size/x-dimension", IPP_TAG_INTEGER)) != NULL)
    {
      if (ippGetInteger(attr, 0) != 21590)
      {
        printf("FAIL (wrong value for x-dimension - %d)\n", ippGetInteger(attr, 0));
        status = 1;
      }
      else
        puts("PASS");
    }
    else
    {
      puts("FAIL (not found)");
      status = 1;
    }

    fputs("ippFindNextAttribute(media-col/media-size/x-dimension): ", stdout);
    if ((attr = ippFindNextAttribute(request, "media-col/media-size/x-dimension", IPP_TAG_INTEGER)) != NULL)
    {
      if (ippGetInteger(attr, 0) != 21000)
      {
        printf("FAIL (wrong value for x-dimension - %d)\n", ippGetInteger(attr, 0));
        status = 1;
      }
      else
        puts("PASS");
    }
    else
    {
      puts("FAIL (not found)");
      status = 1;
    }

    fputs("ippFindNextAttribute(media-col/media-size/x-dimension) again: ", stdout);
    if ((attr = ippFindNextAttribute(request, "media-col/media-size/x-dimension", IPP_TAG_INTEGER)) != NULL)
    {
      printf("FAIL (got %d, expected nothing)\n", ippGetInteger(attr, 0));
      status = 1;
    }
    else
      puts("PASS");

    ippDelete(request);

   /*
    * Read the mixed data and confirm we converted everything to rangeOfInteger
    * values...
    */

    printf("Read Mixed integer/rangeOfInteger from Memory: ");

    request = ippNew();
    data.rpos    = 0;
    data.wused   = sizeof(mixed);
    data.wsize   = sizeof(mixed);
    data.wbuffer = mixed;

    while ((state = ippReadIO(&data, (ipp_iocb_t)read_cb, 1, NULL,
                              request)) != IPP_STATE_DATA)
      if (state == IPP_STATE_ERROR)
	break;

    length = ippLength(request);

    if (state != IPP_STATE_DATA)
    {
      printf("FAIL - %d bytes read.\n", (int)data.rpos);
      status = 1;
    }
    else if (data.rpos != sizeof(mixed))
    {
      printf("FAIL - read %d bytes, expected %d bytes!\n", (int)data.rpos,
             (int)sizeof(mixed));
      print_attributes(request, 8);
      status = 1;
    }
    else if (length != (sizeof(mixed) + 4))
    {
      printf("FAIL - wrong ippLength(), %d instead of %d bytes!\n",
             (int)length, (int)sizeof(mixed) + 4);
      print_attributes(request, 8);
      status = 1;
    }
    else
      puts("PASS");

    fputs("ippFindAttribute(notify-lease-duration-supported): ", stdout);
    if ((attr = ippFindAttribute(request, "notify-lease-duration-supported",
                                 IPP_TAG_ZERO)) == NULL)
    {
      puts("FAIL (not found)");
      status = 1;
    }
    else if (attr->value_tag != IPP_TAG_RANGE)
    {
      printf("FAIL (wrong type - %s)\n", ippTagString(attr->value_tag));
      status = 1;
    }
    else if (attr->num_values != 2)
    {
      printf("FAIL (wrong count - %d)\n", attr->num_values);
      status = 1;
    }
    else if (attr->values[0].range.lower != 1 ||
             attr->values[0].range.upper != 1 ||
             attr->values[1].range.lower != 16 ||
             attr->values[1].range.upper != 32)
    {
      printf("FAIL (wrong values - %d,%d and %d,%d)\n",
             attr->values[0].range.lower,
             attr->values[0].range.upper,
             attr->values[1].range.lower,
             attr->values[1].range.upper);
      status = 1;
    }
    else
      puts("PASS");

    ippDelete(request);

#ifdef DEBUG
   /*
    * Test that private option array is sorted...
    */

    fputs("_ippCheckOptions: ", stdout);
    if ((name = _ippCheckOptions()) == NULL)
      puts("PASS");
    else
    {
      printf("FAIL (\"%s\" out of order)\n", name);
      status = 1;
    }
#endif /* DEBUG */

   /*
    * Test _ippFindOption() private API...
    */

    fputs("_ippFindOption(\"printer-type\"): ", stdout);
    if (_ippFindOption("printer-type"))
      puts("PASS");
    else
    {
      puts("FAIL");
      status = 1;
    }

   /*
    * Summarize...
    */

    putchar('\n');

    if (status)
      puts("Core IPP tests failed.");
    else
      puts("Core IPP tests passed.");
  }
  else
  {
   /*
    * Read IPP files...
    */

    for (i = 1; i < (size_t)argc; i ++)
    {
      if ((fp = cupsFileOpen(argv[i], "r")) == NULL)
      {
	printf("Unable to open \"%s\" - %s\n", argv[i], strerror(errno));
	status = 1;
	continue;
      }

      request = ippNew();
      while ((state = ippReadIO(fp, (ipp_iocb_t)cupsFileRead, 1, NULL,
                                request)) == IPP_STATE_ATTRIBUTE);

      if (state != IPP_STATE_DATA)
      {
	printf("Error reading IPP message from \"%s\"!\n", argv[i]);
	status = 1;
      }
      else
      {
	printf("\n%s:\n", argv[i]);
	print_attributes(request, 4);
      }

      ippDelete(request);
      cupsFileClose(fp);
    }
  }

  return (status);
}
예제 #4
0
파일: getdevices.c 프로젝트: OdyX/cups
ipp_status_t				/* O - Request status - @code IPP_OK@ on success. */
cupsGetDevices(
    http_t           *http,		/* I - Connection to server or @code CUPS_HTTP_DEFAULT@ */
    int              timeout,		/* I - Timeout in seconds or @code CUPS_TIMEOUT_DEFAULT@ */
    const char       *include_schemes,	/* I - Comma-separated URI schemes to include or @code CUPS_INCLUDE_ALL@ */
    const char       *exclude_schemes,	/* I - Comma-separated URI schemes to exclude or @code CUPS_EXCLUDE_NONE@ */
    cups_device_cb_t callback,		/* I - Callback function */
    void             *user_data)	/* I - User data pointer */
{
  ipp_t		*request,		/* CUPS-Get-Devices request */
		*response;		/* CUPS-Get-Devices response */
  ipp_attribute_t *attr;		/* Current attribute */
  const char	*device_class,		/* device-class value */
		*device_id,		/* device-id value */
		*device_info,		/* device-info value */
		*device_location,	/* device-location value */
		*device_make_and_model,	/* device-make-and-model value */
		*device_uri;		/* device-uri value */
  int		blocking;		/* Current blocking-IO mode */
  cups_option_t	option;			/* in/exclude-schemes option */
  http_status_t	status;			/* HTTP status of request */
  ipp_state_t	state;			/* IPP response state */


 /*
  * Range check input...
  */

  DEBUG_printf(("cupsGetDevices(http=%p, timeout=%d, include_schemes=\"%s\", exclude_schemes=\"%s\", callback=%p, user_data=%p)", (void *)http, timeout, include_schemes, exclude_schemes, (void *)callback, user_data));

  if (!callback)
    return (IPP_STATUS_ERROR_INTERNAL);

  if (!http)
    http = _cupsConnect();

  if (!http)
    return (IPP_STATUS_ERROR_SERVICE_UNAVAILABLE);

 /*
  * Create a CUPS-Get-Devices request...
  */

  request = ippNewRequest(IPP_OP_CUPS_GET_DEVICES);

  if (timeout > 0)
    ippAddInteger(request, IPP_TAG_OPERATION, IPP_TAG_INTEGER, "timeout",
                  timeout);

  if (include_schemes)
  {
    option.name  = "include-schemes";
    option.value = (char *)include_schemes;

    cupsEncodeOptions2(request, 1, &option, IPP_TAG_OPERATION);
  }

  if (exclude_schemes)
  {
    option.name  = "exclude-schemes";
    option.value = (char *)exclude_schemes;

    cupsEncodeOptions2(request, 1, &option, IPP_TAG_OPERATION);
  }

 /*
  * Send the request and do any necessary authentication...
  */

  do
  {
    DEBUG_puts("2cupsGetDevices: Sending request...");
    status = cupsSendRequest(http, request, "/", ippLength(request));

    DEBUG_puts("2cupsGetDevices: Waiting for response status...");
    while (status == HTTP_STATUS_CONTINUE)
      status = httpUpdate(http);

    if (status != HTTP_STATUS_OK)
    {
      httpFlush(http);

      if (status == HTTP_STATUS_UNAUTHORIZED)
      {
       /*
	* See if we can do authentication...
	*/

	DEBUG_puts("2cupsGetDevices: Need authorization...");

	if (!cupsDoAuthentication(http, "POST", "/"))
	  httpReconnect2(http, 30000, NULL);
	else
	{
	  status = HTTP_STATUS_CUPS_AUTHORIZATION_CANCELED;
	  break;
	}
      }

#ifdef HAVE_SSL
      else if (status == HTTP_STATUS_UPGRADE_REQUIRED)
      {
       /*
	* Force a reconnect with encryption...
	*/

	DEBUG_puts("2cupsGetDevices: Need encryption...");

	if (!httpReconnect2(http, 30000, NULL))
	  httpEncryption(http, HTTP_ENCRYPTION_REQUIRED);
      }
#endif /* HAVE_SSL */
    }
  }
  while (status == HTTP_STATUS_UNAUTHORIZED ||
         status == HTTP_STATUS_UPGRADE_REQUIRED);

  DEBUG_printf(("2cupsGetDevices: status=%d", status));

  ippDelete(request);

  if (status != HTTP_STATUS_OK)
  {
    _cupsSetHTTPError(status);
    return (cupsLastError());
  }

 /*
  * Read the response in non-blocking mode...
  */

  blocking = httpGetBlocking(http);
  httpBlocking(http, 0);

  response              = ippNew();
  device_class          = NULL;
  device_id             = NULL;
  device_info           = NULL;
  device_location       = "";
  device_make_and_model = NULL;
  device_uri            = NULL;
  attr                  = NULL;

  DEBUG_puts("2cupsGetDevices: Reading response...");

  do
  {
    if ((state = ippRead(http, response)) == IPP_STATE_ERROR)
      break;

    DEBUG_printf(("2cupsGetDevices: state=%d, response->last=%p", state, (void *)response->last));

    if (!response->attrs)
      continue;

    while (attr != response->last)
    {
      if (!attr)
	attr = response->attrs;
      else
        attr = attr->next;

      DEBUG_printf(("2cupsGetDevices: attr->name=\"%s\", attr->value_tag=%d",
                    attr->name, attr->value_tag));

      if (!attr->name)
      {
        if (device_class && device_id && device_info && device_make_and_model &&
	    device_uri)
          (*callback)(device_class, device_id, device_info,
	              device_make_and_model, device_uri, device_location,
		      user_data);

	device_class          = NULL;
	device_id             = NULL;
	device_info           = NULL;
	device_location       = "";
	device_make_and_model = NULL;
	device_uri            = NULL;
      }
      else if (!strcmp(attr->name, "device-class") &&
               attr->value_tag == IPP_TAG_KEYWORD)
        device_class = attr->values[0].string.text;
      else if (!strcmp(attr->name, "device-id") &&
               attr->value_tag == IPP_TAG_TEXT)
        device_id = attr->values[0].string.text;
      else if (!strcmp(attr->name, "device-info") &&
               attr->value_tag == IPP_TAG_TEXT)
        device_info = attr->values[0].string.text;
      else if (!strcmp(attr->name, "device-location") &&
               attr->value_tag == IPP_TAG_TEXT)
        device_location = attr->values[0].string.text;
      else if (!strcmp(attr->name, "device-make-and-model") &&
               attr->value_tag == IPP_TAG_TEXT)
        device_make_and_model = attr->values[0].string.text;
      else if (!strcmp(attr->name, "device-uri") &&
               attr->value_tag == IPP_TAG_URI)
        device_uri = attr->values[0].string.text;
    }
  }
  while (state != IPP_STATE_DATA);

  DEBUG_printf(("2cupsGetDevices: state=%d, response->last=%p", state, (void *)response->last));

  if (device_class && device_id && device_info && device_make_and_model &&
      device_uri)
    (*callback)(device_class, device_id, device_info,
		device_make_and_model, device_uri, device_location, user_data);

 /*
  * Set the IPP status and return...
  */

  httpBlocking(http, blocking);
  httpFlush(http);

  if (status == HTTP_STATUS_ERROR)
    _cupsSetError(IPP_STATUS_ERROR_INTERNAL, strerror(http->error), 0);
  else
  {
    attr = ippFindAttribute(response, "status-message", IPP_TAG_TEXT);

    DEBUG_printf(("cupsGetDevices: status-code=%s, status-message=\"%s\"",
		  ippErrorString(response->request.status.status_code),
		  attr ? attr->values[0].string.text : ""));

    _cupsSetError(response->request.status.status_code,
		  attr ? attr->values[0].string.text :
		      ippErrorString(response->request.status.status_code), 0);
  }

  ippDelete(response);

  return (cupsLastError());
}