static int add_file()

in scheduler/ipp.c [37:689]


static int	add_file(cupsd_client_t *con, cupsd_job_t *job,
		         mime_type_t *filetype, int compression);
static cupsd_job_t *add_job(cupsd_client_t *con, cupsd_printer_t *printer,
			    mime_type_t *filetype);
static void	add_job_subscriptions(cupsd_client_t *con, cupsd_job_t *job);
static void	add_job_uuid(cupsd_job_t *job);
static void	add_printer(cupsd_client_t *con, ipp_attribute_t *uri);
static void	add_printer_state_reasons(cupsd_client_t *con,
		                          cupsd_printer_t *p);
static void	add_queued_job_count(cupsd_client_t *con, cupsd_printer_t *p);
static void	apply_printer_defaults(cupsd_printer_t *printer,
				       cupsd_job_t *job);
static void	authenticate_job(cupsd_client_t *con, ipp_attribute_t *uri);
static void	cancel_all_jobs(cupsd_client_t *con, ipp_attribute_t *uri);
static void	cancel_job(cupsd_client_t *con, ipp_attribute_t *uri);
static void	cancel_subscription(cupsd_client_t *con, int id);
static int	check_rss_recipient(const char *recipient);
static int	check_quotas(cupsd_client_t *con, cupsd_printer_t *p);
static void	close_job(cupsd_client_t *con, ipp_attribute_t *uri);
static void	copy_attrs(ipp_t *to, ipp_t *from, cups_array_t *ra,
		           ipp_tag_t group, int quickcopy,
			   cups_array_t *exclude);
static int	copy_banner(cupsd_client_t *con, cupsd_job_t *job,
		            const char *name);
static int	copy_file(const char *from, const char *to, mode_t mode);
static int	copy_model(cupsd_client_t *con, const char *from,
		           const char *to);
static void	copy_job_attrs(cupsd_client_t *con,
		               cupsd_job_t *job,
			       cups_array_t *ra, cups_array_t *exclude);
static void	copy_printer_attrs(cupsd_client_t *con,
		                   cupsd_printer_t *printer,
				   cups_array_t *ra);
static void	copy_subscription_attrs(cupsd_client_t *con,
		                        cupsd_subscription_t *sub,
					cups_array_t *ra,
					cups_array_t *exclude);
static void	create_job(cupsd_client_t *con, ipp_attribute_t *uri);
static void	*create_local_bg_thread(cupsd_printer_t *printer);
static void	create_local_printer(cupsd_client_t *con);
static cups_array_t *create_requested_array(ipp_t *request);
static void	create_subscriptions(cupsd_client_t *con, ipp_attribute_t *uri);
static void	delete_printer(cupsd_client_t *con, ipp_attribute_t *uri);
static void	get_default(cupsd_client_t *con);
static void	get_devices(cupsd_client_t *con);
static void	get_document(cupsd_client_t *con, ipp_attribute_t *uri);
static void	get_jobs(cupsd_client_t *con, ipp_attribute_t *uri);
static void	get_job_attrs(cupsd_client_t *con, ipp_attribute_t *uri);
static void	get_notifications(cupsd_client_t *con);
static void	get_ppd(cupsd_client_t *con, ipp_attribute_t *uri);
static void	get_ppds(cupsd_client_t *con);
static void	get_printers(cupsd_client_t *con, int type);
static void	get_printer_attrs(cupsd_client_t *con, ipp_attribute_t *uri);
static void	get_printer_supported(cupsd_client_t *con, ipp_attribute_t *uri);
static void	get_subscription_attrs(cupsd_client_t *con, int sub_id);
static void	get_subscriptions(cupsd_client_t *con, ipp_attribute_t *uri);
static const char *get_username(cupsd_client_t *con);
static void	hold_job(cupsd_client_t *con, ipp_attribute_t *uri);
static void	hold_new_jobs(cupsd_client_t *con, ipp_attribute_t *uri);
static void	move_job(cupsd_client_t *con, ipp_attribute_t *uri);
static int	ppd_parse_line(const char *line, char *option, int olen,
		               char *choice, int clen);
static void	print_job(cupsd_client_t *con, ipp_attribute_t *uri);
static void	read_job_ticket(cupsd_client_t *con);
static void	reject_jobs(cupsd_client_t *con, ipp_attribute_t *uri);
static void	release_held_new_jobs(cupsd_client_t *con,
		                      ipp_attribute_t *uri);
static void	release_job(cupsd_client_t *con, ipp_attribute_t *uri);
static void	renew_subscription(cupsd_client_t *con, int sub_id);
static void	restart_job(cupsd_client_t *con, ipp_attribute_t *uri);
static void	save_auth_info(cupsd_client_t *con, cupsd_job_t *job,
		               ipp_attribute_t *auth_info);
static void	send_document(cupsd_client_t *con, ipp_attribute_t *uri);
static void	send_http_error(cupsd_client_t *con, http_status_t status,
		                cupsd_printer_t *printer);
static void	send_ipp_status(cupsd_client_t *con, ipp_status_t status, const char *message, ...) _CUPS_FORMAT(3, 4);
static void	set_default(cupsd_client_t *con, ipp_attribute_t *uri);
static void	set_job_attrs(cupsd_client_t *con, ipp_attribute_t *uri);
static void	set_printer_attrs(cupsd_client_t *con, ipp_attribute_t *uri);
static int	set_printer_defaults(cupsd_client_t *con, cupsd_printer_t *printer);
static void	start_printer(cupsd_client_t *con, ipp_attribute_t *uri);
static void	stop_printer(cupsd_client_t *con, ipp_attribute_t *uri);
static void	url_encode_attr(ipp_attribute_t *attr, char *buffer, size_t bufsize);
static char	*url_encode_string(const char *s, char *buffer, size_t bufsize);
static int	user_allowed(cupsd_printer_t *p, const char *username);
static void	validate_job(cupsd_client_t *con, ipp_attribute_t *uri);
static int	validate_name(const char *name);
static int	validate_user(cupsd_job_t *job, cupsd_client_t *con, const char *owner, char *username, size_t userlen);


/*
 * 'cupsdProcessIPPRequest()' - Process an incoming IPP request.
 */

int					/* O - 1 on success, 0 on failure */
cupsdProcessIPPRequest(
    cupsd_client_t *con)		/* I - Client connection */
{
  ipp_tag_t		group;		/* Current group tag */
  ipp_attribute_t	*attr;		/* Current attribute */
  ipp_attribute_t	*charset;	/* Character set attribute */
  ipp_attribute_t	*language;	/* Language attribute */
  ipp_attribute_t	*uri = NULL;	/* Printer or job URI attribute */
  ipp_attribute_t	*username;	/* requesting-user-name attr */
  int			sub_id;		/* Subscription ID */
  int			valid = 1;	/* Valid request? */


  cupsdLogMessage(CUPSD_LOG_DEBUG2, "cupsdProcessIPPRequest(%p[%d]): operation_id=%04x(%s)", con, con->number, con->request->request.op.operation_id, ippOpString(con->request->request.op.operation_id));

  if (LogLevel >= CUPSD_LOG_DEBUG2)
  {
    for (group = IPP_TAG_ZERO, attr = ippFirstAttribute(con->request); attr; attr = ippNextAttribute(con->request))
    {
      const char  *name;                /* Attribute name */
      char        value[1024];          /* Attribute value */

      if (group != ippGetGroupTag(attr))
      {
        group = ippGetGroupTag(attr);
        if (group != IPP_TAG_ZERO)
          cupsdLogMessage(CUPSD_LOG_DEBUG2, "cupsdProcessIPPRequest: %s", ippTagString(group));
      }

      if ((name = ippGetName(attr)) == NULL)
        continue;

      ippAttributeString(attr, value, sizeof(value));

      cupsdLogMessage(CUPSD_LOG_DEBUG2, "cupsdProcessIPPRequest: %s %s%s '%s'", name, ippGetCount(attr) > 1 ? "1setOf " : "", ippTagString(ippGetValueTag(attr)), value);
    }
  }

 /*
  * First build an empty response message for this request...
  */

  con->response = ippNew();

  con->response->request.status.version[0] = con->request->request.op.version[0];
  con->response->request.status.version[1] = con->request->request.op.version[1];
  con->response->request.status.request_id = con->request->request.op.request_id;

 /*
  * Then validate the request header and required attributes...
  */

  if (con->request->request.any.version[0] != 1 && con->request->request.any.version[0] != 2)
  {
   /*
    * Return an error, since we only support IPP 1.x and 2.x.
    */

    cupsdAddEvent(CUPSD_EVENT_SERVER_AUDIT, NULL, NULL, "%04X %s Bad request version number %d.%d.", IPP_STATUS_ERROR_VERSION_NOT_SUPPORTED, con->http->hostname, con->request->request.any.version[0], con->request->request.any.version[1]);

    send_ipp_status(con, IPP_STATUS_ERROR_VERSION_NOT_SUPPORTED, _("Bad request version number %d.%d."), con->request->request.any.version[0], con->request->request.any.version[1]);
  }
  else if (con->request->request.any.request_id < 1)
  {
   /*
    * Return an error, since request IDs must be between 1 and 2^31-1
    */

    cupsdAddEvent(CUPSD_EVENT_SERVER_AUDIT, NULL, NULL, "%04X %s Bad request ID %d.", IPP_STATUS_ERROR_BAD_REQUEST, con->http->hostname, con->request->request.any.request_id);

    send_ipp_status(con, IPP_STATUS_ERROR_BAD_REQUEST, _("Bad request ID %d."), con->request->request.any.request_id);
  }
  else if (!con->request->attrs)
  {
    cupsdAddEvent(CUPSD_EVENT_SERVER_AUDIT, NULL, NULL, "%04X %s No attributes in request.", IPP_STATUS_ERROR_BAD_REQUEST, con->http->hostname);

    send_ipp_status(con, IPP_STATUS_ERROR_BAD_REQUEST, _("No attributes in request."));
  }
  else
  {
   /*
    * Make sure that the attributes are provided in the correct order and
    * don't repeat groups...
    */

    for (attr = con->request->attrs, group = attr->group_tag;
	 attr;
	 attr = attr->next)
      if (attr->group_tag < group && attr->group_tag != IPP_TAG_ZERO)
      {
       /*
	* Out of order; return an error...
	*/

	cupsdAddEvent(CUPSD_EVENT_SERVER_AUDIT, NULL, NULL, "%04X %s Attribute groups are out of order", IPP_STATUS_ERROR_BAD_REQUEST, con->http->hostname);

	send_ipp_status(con, IPP_STATUS_ERROR_BAD_REQUEST, _("Attribute groups are out of order (%x < %x)."), attr->group_tag, group);
	break;
      }
      else
	group = attr->group_tag;

    if (!attr)
    {
     /*
      * Then make sure that the first three attributes are:
      *
      *     attributes-charset
      *     attributes-natural-language
      *     printer-uri/job-uri
      */

      attr = con->request->attrs;
      if (attr && attr->name && !strcmp(attr->name, "attributes-charset") && (attr->value_tag & IPP_TAG_MASK) == IPP_TAG_CHARSET && attr->group_tag == IPP_TAG_OPERATION)
	charset = attr;
      else
	charset = NULL;

      if (attr)
        attr = attr->next;

      if (attr && attr->name && !strcmp(attr->name, "attributes-natural-language") && (attr->value_tag & IPP_TAG_MASK) == IPP_TAG_LANGUAGE && attr->group_tag == IPP_TAG_OPERATION)
      {
	language = attr;

       /*
        * Reset language for this request if different from Accept-Language.
        */

	if (!con->language ||
	    strcmp(attr->values[0].string.text, con->language->language))
	{
	  cupsLangFree(con->language);
	  con->language = cupsLangGet(attr->values[0].string.text);
	}
      }
      else
	language = NULL;

      if ((attr = ippFindAttribute(con->request, "printer-uri", IPP_TAG_URI)) != NULL && attr->group_tag == IPP_TAG_OPERATION)
	uri = attr;
      else if ((attr = ippFindAttribute(con->request, "job-uri", IPP_TAG_URI)) != NULL && attr->group_tag == IPP_TAG_OPERATION)
	uri = attr;
      else if (con->request->request.op.operation_id == CUPS_GET_PPD && (attr = ippFindAttribute(con->request, "ppd-name", IPP_TAG_NAME)) != NULL && attr->group_tag == IPP_TAG_OPERATION)
        uri = attr;
      else
	uri = NULL;

      if (charset)
	ippAddString(con->response, IPP_TAG_OPERATION, IPP_TAG_CHARSET, "attributes-charset", NULL, charset->values[0].string.text);
      else
	ippAddString(con->response, IPP_TAG_OPERATION, IPP_TAG_CHARSET, "attributes-charset", NULL, "utf-8");

      if (language)
	ippAddString(con->response, IPP_TAG_OPERATION, IPP_TAG_LANGUAGE, "attributes-natural-language", NULL, language->values[0].string.text);
      else
	ippAddString(con->response, IPP_TAG_OPERATION, IPP_TAG_LANGUAGE, "attributes-natural-language", NULL, DefaultLanguage);

      if (charset && _cups_strcasecmp(charset->values[0].string.text, "us-ascii") && _cups_strcasecmp(charset->values[0].string.text, "utf-8"))
      {
       /*
        * Bad character set...
	*/

        cupsdLogMessage(CUPSD_LOG_ERROR, "Unsupported character set \"%s\"",
	                charset->values[0].string.text);
	cupsdAddEvent(CUPSD_EVENT_SERVER_AUDIT, NULL, NULL, "%04X %s Unsupported attributes-charset value \"%s\".", IPP_STATUS_ERROR_CHARSET, con->http->hostname, charset->values[0].string.text);
	send_ipp_status(con, IPP_STATUS_ERROR_CHARSET, _("Unsupported character set \"%s\"."), charset->values[0].string.text);
      }
      else if (!charset || !language ||
	       (!uri &&
	        con->request->request.op.operation_id != CUPS_GET_DEFAULT &&
	        con->request->request.op.operation_id != CUPS_GET_PRINTERS &&
	        con->request->request.op.operation_id != CUPS_GET_CLASSES &&
	        con->request->request.op.operation_id != CUPS_GET_DEVICES &&
	        con->request->request.op.operation_id != CUPS_GET_PPDS))
      {
       /*
	* Return an error, since attributes-charset,
	* attributes-natural-language, and printer-uri/job-uri are required
	* for all operations.
	*/

        if (!charset)
	{
	  cupsdLogMessage(CUPSD_LOG_ERROR, "Missing attributes-charset attribute.");

	  cupsdAddEvent(CUPSD_EVENT_SERVER_AUDIT, NULL, NULL, "%04X %s Missing attributes-charset attribute.", IPP_STATUS_ERROR_BAD_REQUEST, con->http->hostname);
        }

        if (!language)
	{
	  cupsdLogMessage(CUPSD_LOG_ERROR,
	                  "Missing attributes-natural-language attribute.");

	  cupsdAddEvent(CUPSD_EVENT_SERVER_AUDIT, NULL, NULL, "%04X %s Missing attributes-natural-language attribute.", IPP_STATUS_ERROR_BAD_REQUEST, con->http->hostname);
        }

        if (!uri)
	{
	  cupsdLogMessage(CUPSD_LOG_ERROR, "Missing printer-uri, job-uri, or ppd-name attribute.");

	  cupsdAddEvent(CUPSD_EVENT_SERVER_AUDIT, NULL, NULL, "%04X %s Missing printer-uri, job-uri, or ppd-name attribute.", IPP_STATUS_ERROR_BAD_REQUEST, con->http->hostname);
        }

	cupsdLogMessage(CUPSD_LOG_DEBUG, "Request attributes follow...");

	for (attr = con->request->attrs; attr; attr = attr->next)
	  cupsdLogMessage(CUPSD_LOG_DEBUG,
	        	  "attr \"%s\": group_tag = %x, value_tag = %x",
	        	  attr->name ? attr->name : "(null)", attr->group_tag,
			  attr->value_tag);

	cupsdLogMessage(CUPSD_LOG_DEBUG, "End of attributes...");

	send_ipp_status(con, IPP_BAD_REQUEST,
	                _("Missing required attributes."));
      }
      else
      {
       /*
	* OK, all the checks pass so far; validate "requesting-user-name"
	* attribute value...
	*/

        if ((username = ippFindAttribute(con->request, "requesting-user-name", IPP_TAG_ZERO)) != NULL)
        {
         /*
          * Validate "requesting-user-name"...
          */

          if (username->group_tag != IPP_TAG_OPERATION && StrictConformance)
          {
	    cupsdAddEvent(CUPSD_EVENT_SERVER_AUDIT, NULL, NULL, "%04X %s \"requesting-user-name\" attribute in wrong group.", IPP_STATUS_ERROR_BAD_REQUEST, con->http->hostname);
	    send_ipp_status(con, IPP_STATUS_ERROR_BAD_REQUEST, _("\"requesting-user-name\" attribute in wrong group."));
	    valid = 0;
          }
          else if (username->value_tag != IPP_TAG_NAME && username->value_tag != IPP_TAG_NAMELANG)
          {
	    cupsdAddEvent(CUPSD_EVENT_SERVER_AUDIT, NULL, NULL, "%04X %s \"requesting-user-name\" attribute with wrong syntax.", IPP_STATUS_ERROR_ATTRIBUTES_OR_VALUES, con->http->hostname);
	    send_ipp_status(con, IPP_STATUS_ERROR_ATTRIBUTES_OR_VALUES, _("\"requesting-user-name\" attribute with wrong syntax."));
	    if ((attr = ippCopyAttribute(con->response, username, 0)) != NULL)
	      attr->group_tag = IPP_TAG_UNSUPPORTED_GROUP;
	    valid = 0;
          }
          else if (!ippValidateAttribute(username))
          {
	    cupsdAddEvent(CUPSD_EVENT_SERVER_AUDIT, NULL, NULL, "%04X %s \"requesting-user-name\" attribute with bad value.", IPP_STATUS_ERROR_ATTRIBUTES_OR_VALUES, con->http->hostname);

            if (StrictConformance)
            {
             /*
              * Throw an error...
              */

	      send_ipp_status(con, IPP_STATUS_ERROR_ATTRIBUTES_OR_VALUES, _("\"requesting-user-name\" attribute with wrong syntax."));
              if ((attr = ippCopyAttribute(con->response, username, 0)) != NULL)
                attr->group_tag = IPP_TAG_UNSUPPORTED_GROUP;
	      valid = 0;
	    }
	    else
	    {
	     /*
	      * Map bad "requesting-user-name" to 'anonymous'...
	      */

              ippSetString(con->request, &username, 0, "anonymous");
	    }
          }
          else if (!strcmp(username->values[0].string.text, "root") && _cups_strcasecmp(con->http->hostname, "localhost") && strcmp(con->username, "root"))
	  {
	   /*
	    * Remote unauthenticated user masquerading as local root...
	    */

            ippSetString(con->request, &username, 0, RemoteRoot);
	  }
	}

        if ((attr = ippFindAttribute(con->request, "notify-subscription-id", IPP_TAG_INTEGER)) != NULL)
	  sub_id = attr->values[0].integer;
	else
	  sub_id = 0;

        if (valid)
        {
	 /*
	  * Try processing the operation...
	  */

	  if (uri)
	    cupsdLogMessage(CUPSD_LOG_DEBUG, "%s %s", ippOpString(con->request->request.op.operation_id), uri->values[0].string.text);
	  else
	    cupsdLogMessage(CUPSD_LOG_DEBUG, "%s", ippOpString(con->request->request.op.operation_id));

	  switch (con->request->request.op.operation_id)
	  {
	    case IPP_OP_PRINT_JOB :
		print_job(con, uri);
		break;

	    case IPP_OP_VALIDATE_JOB :
		validate_job(con, uri);
		break;

	    case IPP_OP_CREATE_JOB :
		create_job(con, uri);
		break;

	    case IPP_OP_SEND_DOCUMENT :
		send_document(con, uri);
		break;

	    case IPP_OP_CANCEL_JOB :
		cancel_job(con, uri);
		break;

	    case IPP_OP_GET_JOB_ATTRIBUTES :
		get_job_attrs(con, uri);
		break;

	    case IPP_OP_GET_JOBS :
		get_jobs(con, uri);
		break;

	    case IPP_OP_GET_PRINTER_ATTRIBUTES :
		get_printer_attrs(con, uri);
		break;

	    case IPP_OP_GET_PRINTER_SUPPORTED_VALUES :
		get_printer_supported(con, uri);
		break;

	    case IPP_OP_HOLD_JOB :
		hold_job(con, uri);
		break;

	    case IPP_OP_RELEASE_JOB :
		release_job(con, uri);
		break;

	    case IPP_OP_RESTART_JOB :
		restart_job(con, uri);
		break;

	    case IPP_OP_PAUSE_PRINTER :
		stop_printer(con, uri);
		break;

	    case IPP_OP_RESUME_PRINTER :
		start_printer(con, uri);
		break;

	    case IPP_OP_PURGE_JOBS :
	    case IPP_OP_CANCEL_JOBS :
	    case IPP_OP_CANCEL_MY_JOBS :
		cancel_all_jobs(con, uri);
		break;

	    case IPP_OP_SET_JOB_ATTRIBUTES :
		set_job_attrs(con, uri);
		break;

	    case IPP_OP_SET_PRINTER_ATTRIBUTES :
		set_printer_attrs(con, uri);
		break;

	    case IPP_OP_HOLD_NEW_JOBS :
		hold_new_jobs(con, uri);
		break;

	    case IPP_OP_RELEASE_HELD_NEW_JOBS :
		release_held_new_jobs(con, uri);
		break;

	    case IPP_OP_CLOSE_JOB :
		close_job(con, uri);
		break;

	    case IPP_OP_CUPS_GET_DEFAULT :
		get_default(con);
		break;

	    case IPP_OP_CUPS_GET_PRINTERS :
		get_printers(con, 0);
		break;

	    case IPP_OP_CUPS_GET_CLASSES :
		get_printers(con, CUPS_PRINTER_CLASS);
		break;

	    case IPP_OP_CUPS_ADD_MODIFY_PRINTER :
		add_printer(con, uri);
		break;

	    case IPP_OP_CUPS_DELETE_PRINTER :
		delete_printer(con, uri);
		break;

	    case IPP_OP_CUPS_ADD_MODIFY_CLASS :
		add_class(con, uri);
		break;

	    case IPP_OP_CUPS_DELETE_CLASS :
		delete_printer(con, uri);
		break;

	    case IPP_OP_CUPS_ACCEPT_JOBS :
	    case IPP_OP_ENABLE_PRINTER :
		accept_jobs(con, uri);
		break;

	    case IPP_OP_CUPS_REJECT_JOBS :
	    case IPP_OP_DISABLE_PRINTER :
		reject_jobs(con, uri);
		break;

	    case IPP_OP_CUPS_SET_DEFAULT :
		set_default(con, uri);
		break;

	    case IPP_OP_CUPS_GET_DEVICES :
		get_devices(con);
		break;

	    case IPP_OP_CUPS_GET_DOCUMENT :
		get_document(con, uri);
		break;

	    case IPP_OP_CUPS_GET_PPD :
		get_ppd(con, uri);
		break;

	    case IPP_OP_CUPS_GET_PPDS :
		get_ppds(con);
		break;

	    case IPP_OP_CUPS_MOVE_JOB :
		move_job(con, uri);
		break;

	    case IPP_OP_CUPS_AUTHENTICATE_JOB :
		authenticate_job(con, uri);
		break;

	    case IPP_OP_CREATE_PRINTER_SUBSCRIPTIONS :
	    case IPP_OP_CREATE_JOB_SUBSCRIPTIONS :
		create_subscriptions(con, uri);
		break;

	    case IPP_OP_GET_SUBSCRIPTION_ATTRIBUTES :
		get_subscription_attrs(con, sub_id);
		break;

	    case IPP_OP_GET_SUBSCRIPTIONS :
		get_subscriptions(con, uri);
		break;

	    case IPP_OP_RENEW_SUBSCRIPTION :
		renew_subscription(con, sub_id);
		break;

	    case IPP_OP_CANCEL_SUBSCRIPTION :
		cancel_subscription(con, sub_id);
		break;

	    case IPP_OP_GET_NOTIFICATIONS :
		get_notifications(con);
		break;

	    case IPP_OP_CUPS_CREATE_LOCAL_PRINTER :
		create_local_printer(con);
		break;

	    default :
		cupsdAddEvent(CUPSD_EVENT_SERVER_AUDIT, NULL, NULL, "%04X %s Operation %04X (%s) not supported.", IPP_STATUS_ERROR_OPERATION_NOT_SUPPORTED, con->http->hostname, con->request->request.op.operation_id, ippOpString(con->request->request.op.operation_id));

		send_ipp_status(con, IPP_STATUS_ERROR_OPERATION_NOT_SUPPORTED, _("%s not supported."), ippOpString(con->request->request.op.operation_id));
		break;
	  }
	}
      }
    }
  }

  if (con->response)
  {
   /*
    * Sending data from the scheduler...
    */

    cupsdLogClient(con, con->response->request.status.status_code >= IPP_STATUS_ERROR_BAD_REQUEST && con->response->request.status.status_code != IPP_STATUS_ERROR_NOT_FOUND ? CUPSD_LOG_ERROR : CUPSD_LOG_DEBUG, "Returning IPP %s for %s (%s) from %s.",  ippErrorString(con->response->request.status.status_code), ippOpString(con->request->request.op.operation_id), uri ? uri->values[0].string.text : "no URI", con->http->hostname);

    httpClearFields(con->http);

#ifdef CUPSD_USE_CHUNKING
   /*
    * Because older versions of CUPS (1.1.17 and older) and some IPP
    * clients do not implement chunking properly, we cannot use
    * chunking by default.  This may become the default in future
    * CUPS releases, or we might add a configuration directive for
    * it.
    */

    if (con->http->version == HTTP_1_1)
    {
      cupsdLogClient(con, CUPSD_LOG_DEBUG, "Transfer-Encoding: chunked");
      cupsdSetLength(con->http, 0);
    }
    else
#endif /* CUPSD_USE_CHUNKING */
    {
      size_t	length;			/* Length of response */


      length = ippLength(con->response);

      if (con->file >= 0 && !con->pipe_pid)
      {
	struct stat	fileinfo;	/* File information */

	if (!fstat(con->file, &fileinfo))
	  length += (size_t)fileinfo.st_size;
      }

      cupsdLogClient(con, CUPSD_LOG_DEBUG, "Content-Length: " CUPS_LLFMT, CUPS_LLCAST length);
      httpSetLength(con->http, length);
    }

    if (cupsdSendHeader(con, HTTP_OK, "application/ipp", CUPSD_AUTH_NONE))
    {
     /*
      * Tell the caller the response header was sent successfully...
      */

      cupsdAddSelect(httpGetFd(con->http), (cupsd_selfunc_t)cupsdReadClient, (cupsd_selfunc_t)cupsdWriteClient, con);

      return (1);
    }
    else
    {
     /*
      * Tell the caller the response header could not be sent...
      */

      return (0);
    }
  }
  else
  {
   /*
    * Sending data from a subprocess like cups-deviced; tell the caller
    * everything is A-OK so far...
    */

    return (1);
  }
}