C++ dbus_message_new_error函数代码示例

static DBusMessage * properties_handler(DBusMessage *message,
					struct wpa_dbus_object_desc *obj_dsc)
{
	DBusMessageIter iter;
	char *interface;
	const char *method;

	method = dbus_message_get_member(message);
	dbus_message_iter_init(message, &iter);

	if (!os_strncmp(WPA_DBUS_PROPERTIES_GET, method,
			WPAS_DBUS_METHOD_SIGNAL_PROP_MAX) ||
	    !os_strncmp(WPA_DBUS_PROPERTIES_SET, method,
			WPAS_DBUS_METHOD_SIGNAL_PROP_MAX) ||
	    !os_strncmp(WPA_DBUS_PROPERTIES_GETALL, method,
			WPAS_DBUS_METHOD_SIGNAL_PROP_MAX)) {
		/* First argument: interface name (DBUS_TYPE_STRING) */
		if (dbus_message_iter_get_arg_type(&iter) != DBUS_TYPE_STRING)
		{
			return dbus_message_new_error(message,
						      DBUS_ERROR_INVALID_ARGS,
						      NULL);
		}

		dbus_message_iter_get_basic(&iter, &interface);

		if (!os_strncmp(WPA_DBUS_PROPERTIES_GETALL, method,
				WPAS_DBUS_METHOD_SIGNAL_PROP_MAX)) {
			/* GetAll */
			return properties_get_all(message, interface, obj_dsc);
		}
		/* Get or Set */
		return properties_get_or_set(message, &iter, interface,
					     obj_dsc);
	}
	return dbus_message_new_error(message, DBUS_ERROR_UNKNOWN_METHOD,
				      NULL);
}

static DBusHandlerResult
handle_run_hello_from_self (DBusConnection     *connection,
                                               DBusMessage        *message)
{
  DBusError error;
  DBusMessage *reply, *self_message;
  DBusPendingCall *pcall;
  char *s;

  dbus_error_init (&error);
  
  if (!dbus_message_get_args (message,
                              &error,
                              DBUS_TYPE_STRING, &s,
                              DBUS_TYPE_INVALID))
    {
      reply = dbus_message_new_error (message,
                                      error.name,
                                      error.message);

      if (reply == NULL)
        die ("No memory\n");

      if (!dbus_connection_send (connection, reply, NULL))
        die ("No memory\n");

      dbus_message_unref (reply);

      return DBUS_HANDLER_RESULT_NOT_YET_HANDLED;
    }
    printf ("Sending HelloFromSelf\n");

 self_message = dbus_message_new_method_call ("org.freedesktop.DBus.GLib.TestEchoService",
                                          "/org/freedesktop/DBus/GLib/TestSuite",
                                          "org.freedesktop.DBus.GLib.TestSuite",
                                          "HelloFromSelf");
  
  if (self_message == NULL)
    die ("No memory");
  
  if (!dbus_connection_send_with_reply (connection, self_message, &pcall, -1))
    die("No memory");
  
  dbus_message_ref (message);
  if (!dbus_pending_call_set_notify (pcall, check_hello_from_self_reply, (void *)message, NULL))
    die("No memory");
    
  printf ("Sent HelloFromSelf\n");
  return DBUS_HANDLER_RESULT_HANDLED;
}

static DBusHandlerResult
handle_echo (DBusConnection     *connection,
             DBusMessage        *message)
{
  DBusError error;
  DBusMessage *reply;
  char *s;

  _dbus_verbose ("sending reply to Echo method\n");
  
  dbus_error_init (&error);
  
  if (!dbus_message_get_args (message,
                              &error,
                              DBUS_TYPE_STRING, &s,
                              DBUS_TYPE_INVALID))
    {
      reply = dbus_message_new_error (message,
                                      error.name,
                                      error.message);

      if (reply == NULL)
        die ("No memory\n");

      if (!dbus_connection_send (connection, reply, NULL))
        die ("No memory\n");

      dbus_message_unref (reply);

      return DBUS_HANDLER_RESULT_NOT_YET_HANDLED;
    }

  reply = dbus_message_new_method_return (message);
  if (reply == NULL)
    die ("No memory\n");
  
  if (!dbus_message_append_args (reply,
                                 DBUS_TYPE_STRING, &s,
                                 DBUS_TYPE_INVALID))
    die ("No memory");
  
  if (!dbus_connection_send (connection, reply, NULL))
    die ("No memory\n");

  fprintf (stderr, "Echo service echoed string: \"%s\"\n", s);
  
  dbus_message_unref (reply);
    
  return DBUS_HANDLER_RESULT_HANDLED;
}

/**
 * wpas_dbus_new_invalid_opts_error - Return a new invalid options error message
 * @message: Pointer to incoming dbus message this error refers to
 * Returns: a dbus error message
 *
 * Convenience function to create and return an invalid options error
 */
DBusMessage * wpas_dbus_new_invalid_opts_error(DBusMessage *message,
					       const char *arg)
{
	DBusMessage *reply;

	reply = dbus_message_new_error(message, WPAS_ERROR_INVALID_OPTS,
				       "Did not receive correct message "
				       "arguments.");
	if (arg != NULL)
		dbus_message_append_args(reply, DBUS_TYPE_STRING, &arg,
					 DBUS_TYPE_INVALID);

	return reply;
}

/**
 * wpas_dbus_iface_wps_pin - Establish the PIN number of the enrollee
 * @message: Pointer to incoming dbus message
 * @wpa_s: %wpa_supplicant data structure
 * Returns: A dbus message containing a UINT32 indicating success (1) or
 *          failure (0)
 *
 * Handler function for "wpsPin" method call
 */
DBusMessage * wpas_dbus_iface_wps_pin(DBusMessage *message,
				      struct wpa_supplicant *wpa_s)
{
	DBusMessage *reply = NULL;
	char *arg_bssid;
	char *pin = NULL;
	u8 bssid[ETH_ALEN], *_bssid = NULL;
	int ret = 0;

	if (!dbus_message_get_args(message, NULL, DBUS_TYPE_STRING, &arg_bssid,
				   DBUS_TYPE_STRING, &pin, DBUS_TYPE_INVALID))
		return wpas_dbus_new_invalid_opts_error(message, NULL);

	if (!os_strcmp(arg_bssid, "any"))
		_bssid = NULL;
	else if (!hwaddr_aton(arg_bssid, bssid))
		_bssid = bssid;
	else {
		return wpas_dbus_new_invalid_opts_error(message,
							"Invalid BSSID");
	}

	if (os_strlen(pin) > 0)
		ret = wpas_wps_start_pin(wpa_s, _bssid, pin, 0,
					 DEV_PW_DEFAULT);
	else
		ret = wpas_wps_start_pin(wpa_s, _bssid, NULL, 0,
					 DEV_PW_DEFAULT);

	if (ret < 0) {
		return dbus_message_new_error(message,
					      WPAS_ERROR_WPS_PIN_ERROR,
					      "Could not init PIN");
	}

	reply = dbus_message_new_method_return(message);
	if (reply == NULL)
		return NULL;

	if (ret == 0) {
		dbus_message_append_args(reply, DBUS_TYPE_STRING, &pin,
					 DBUS_TYPE_INVALID);
	} else {
		char npin[9];
		os_snprintf(npin, sizeof(npin), "%08d", ret);
		dbus_message_append_args(reply, DBUS_TYPE_STRING, &npin,
					 DBUS_TYPE_INVALID);
	}
	return reply;
}

DBusHandlerResult error_unknown_method(DBusConnection *conn, DBusMessage *msg)
{
	char error[128];
	const char *signature = dbus_message_get_signature(msg);
	const char *method = dbus_message_get_member(msg);
	const char *interface = dbus_message_get_interface(msg);

	snprintf(error, 128, "Method \"%s\" with signature \"%s\" on interface \"%s\" doesn't exist",
			method, signature, interface);

	return send_message_and_unref(conn,
		dbus_message_new_error(msg, ERROR_INTERFACE ".UnknownMethod",
							error));
}

static int
message_reply(lua_State *T)
{
	DBusConnection *conn = bus_unbox(T, lua_upvalueindex(1));
	struct message_object *m;
	DBusMessage *msg;
	DBusMessage *reply;

	if (conn == NULL) /* connection closed */
		return 0;

	m = lua_touserdata(T, lua_upvalueindex(2));
	msg = m->msg;
	if (msg == NULL)
		return luaL_error(T, "send reply called twice");

	m->msg = NULL;

	/* check if the method returned an error */
	if (lua_gettop(T) > 0 && lua_isnil(T, 1)) {
		const char *name = luaL_checkstring(T, 2);
		const char *message = luaL_optstring(T, 3, NULL);

		if (message && message[0] == '\0')
			message = NULL;

		reply = dbus_message_new_error(msg, name, message);
		dbus_message_unref(msg);
		if (reply == NULL)
			return 0;
	} else {
		const char *signature = luaL_optstring(T, 1, NULL);

		reply = dbus_message_new_method_return(msg);
		dbus_message_unref(msg);
		if (reply == NULL)
			return 0;

		if (signature && signature[0] != '\0' &&
		    lem_dbus_add_arguments(T, 2, signature, reply)) {
			dbus_message_unref(reply);
			/* add_arguments() pushes its own error message */
			return luaL_error(T, "%s", lua_tostring(T, -1));
		}
	}

	dbus_connection_send(conn, reply, NULL);
	dbus_message_unref(reply);
	return 0;
}

static DBusMessage * properties_set(DBusMessage *message,
				    const struct wpa_dbus_property_desc *dsc,
				    void *user_data)
{
	DBusMessage *reply;
	DBusMessageIter iter;
	DBusError error;

	if (os_strcmp(dbus_message_get_signature(message), "ssv")) {
		return dbus_message_new_error(message, DBUS_ERROR_INVALID_ARGS,
					      NULL);
	}

	if (dsc->setter == NULL) {
		return dbus_message_new_error(message, DBUS_ERROR_INVALID_ARGS,
					      "Property is read-only");
	}

	dbus_message_iter_init(message, &iter);
	/* Skip the interface name and the property name */
	dbus_message_iter_next(&iter);
	dbus_message_iter_next(&iter);

	/* Iter will now point to the property's new value */
	dbus_error_init(&error);
	if (dsc->setter(&iter, &error, user_data) == TRUE) {
		/* Success */
		reply = dbus_message_new_method_return(message);
	} else {
		reply = wpas_dbus_reply_new_from_error(
			message, &error, DBUS_ERROR_FAILED,
			"Failed to set property");
		dbus_error_free(&error);
	}

	return reply;
}

static DBusMessage * msg_method_handler(DBusMessage *message,
					struct wpa_dbus_object_desc *obj_dsc)
{
	const struct wpa_dbus_method_desc *method_dsc = obj_dsc->methods;
	const char *method;
	const char *msg_interface;

	method = dbus_message_get_member(message);
	msg_interface = dbus_message_get_interface(message);

	/* try match call to any registered method */
	while (method_dsc && method_dsc->dbus_method) {
		/* compare method names and interfaces */
		if (!os_strncmp(method_dsc->dbus_method, method,
				WPAS_DBUS_METHOD_SIGNAL_PROP_MAX) &&
		    !os_strncmp(method_dsc->dbus_interface, msg_interface,
				WPAS_DBUS_INTERFACE_MAX))
			break;

		method_dsc++;
	}
	if (method_dsc == NULL || method_dsc->dbus_method == NULL) {
		wpa_printf(MSG_DEBUG, "no method handler for %s.%s on %s",
			   msg_interface, method,
			   dbus_message_get_path(message));
		return dbus_message_new_error(message,
					      DBUS_ERROR_UNKNOWN_METHOD, NULL);
	}

	if (!is_signature_correct(message, method_dsc)) {
		return dbus_message_new_error(message, DBUS_ERROR_INVALID_ARGS,
					      NULL);
	}

	return method_dsc->method_handler(message,
					  obj_dsc->user_data);
}

static DBusHandlerResult handle_get(DBusConnection *conn, DBusMessage *msg, pa_dbusobj_server_lookup *sl) {
    DBusHandlerResult r = DBUS_HANDLER_RESULT_HANDLED;
    const char* interface;
    const char* property;
    DBusMessage *reply = NULL;

    pa_assert(conn);
    pa_assert(msg);
    pa_assert(sl);

    if (!dbus_message_get_args(msg, NULL, DBUS_TYPE_STRING, &interface, DBUS_TYPE_STRING, &property, DBUS_TYPE_INVALID)) {
        if (!(reply = dbus_message_new_error(msg, DBUS_ERROR_INVALID_ARGS, "Invalid arguments"))) {
            r = DBUS_HANDLER_RESULT_NOT_YET_HANDLED;
            goto finish;
        }
        if (!dbus_connection_send(conn, reply, NULL)) {
            r = DBUS_HANDLER_RESULT_NEED_MEMORY;
            goto finish;
        }
        r = DBUS_HANDLER_RESULT_HANDLED;
        goto finish;
    }

    if (*interface && !pa_streq(interface, INTERFACE)) {
        r = DBUS_HANDLER_RESULT_NOT_YET_HANDLED;
        goto finish;
    }

    if (!pa_streq(property, "Address")) {
        if (!(reply = dbus_message_new_error_printf(msg, PA_DBUS_ERROR_NO_SUCH_PROPERTY, "%s: No such property", property))) {
            r = DBUS_HANDLER_RESULT_NOT_YET_HANDLED;
            goto finish;
        }
        if (!dbus_connection_send(conn, reply, NULL)) {
            r = DBUS_HANDLER_RESULT_NEED_MEMORY;
            goto finish;
        }
        r = DBUS_HANDLER_RESULT_HANDLED;
        goto finish;
    }

    r = handle_get_address(conn, msg, sl);

finish:
    if (reply)
        dbus_message_unref(reply);

    return r;
}

static DBusMessage*
service_method_unlock_with_master_password (GkdSecretService *self, DBusMessage *message)
{
	DBusError derr = DBUS_ERROR_INIT;
	GkdSecretSecret *master;
	GError *error = NULL;
	GckObject *collection;
	DBusMessageIter iter;
	DBusMessage *reply;
	const gchar *path;

	/* Parse the incoming message */
	if (!dbus_message_has_signature (message, "o(oayays)"))
		return NULL;
	if (!dbus_message_iter_init (message, &iter))
		g_return_val_if_reached (NULL);
	dbus_message_iter_get_basic (&iter, &path);
	dbus_message_iter_next (&iter);
	master = gkd_secret_secret_parse (self, message, &iter, &derr);
	if (master == NULL)
		return gkd_secret_error_to_reply (message, &derr);

	/* Make sure we have such a collection */
	collection = gkd_secret_objects_lookup_collection (self->objects,
	                                                   dbus_message_get_sender (message),
	                                                   path);

	/* No such collection */
	if (collection == NULL) {
		reply = dbus_message_new_error (message, SECRET_ERROR_NO_SUCH_OBJECT,
		                                "The collection does not exist");

	/* Success */
	} else if (gkd_secret_unlock_with_secret (collection, master, &error)) {
		reply = dbus_message_new_method_return (message);
		gkd_secret_objects_emit_collection_locked (self->objects, collection);

	/* Failure */
	} else {
		reply = gkd_secret_propagate_error (message, "Couldn't unlock collection", error);
	}

	gkd_secret_secret_free (master);

	if (collection)
		g_object_unref (collection);

	return reply;
}

gboolean g_dbus_send_error_valist(DBusConnection *connection,
					DBusMessage *message, const char *name,
					const char *format, va_list args)
{
	DBusMessage *error;
	char str[1024];

	vsnprintf(str, sizeof(str), format, args);

	error = dbus_message_new_error(message, name, str);
	if (error == NULL)
		return FALSE;

	return g_dbus_send_message(connection, error);
}

/**
 * Create a new D-Bus error message, with proper error checking
 * will exit the mainloop if an error occurs
 *
 * @param message The DBusMessage that caused the error message to be sent
 * @param error The message to send
 * @return A new DBusMessage
 */
static DBusMessage *dbus_new_error(DBusMessage *const message,
				   const gchar *const error)
{
	DBusMessage *error_msg;

	if ((error_msg = dbus_message_new_error(message, error,
						NULL)) == NULL) {
		mce_log(LL_CRIT, "No memory for new D-Bus error message!");
		// FIXME: this is not how one should exit from mainloop
		mce_quit_mainloop();
		exit(EXIT_FAILURE);
	}

	return error_msg;
}

static DBusMessage*
handle_forget (void            *object,
               DBusMessage     *message,
               DBusError       *error)
{
    const char *notification_path;
    const char *resource_id;
    DBusMessageIter iter;
    
    dbus_message_iter_init (message, &iter);

    if (dbus_message_iter_get_arg_type(&iter) != DBUS_TYPE_OBJECT_PATH) {
        return dbus_message_new_error(message,
				      DBUS_ERROR_INVALID_ARGS,
				      _("First argument should be an object path (notification_path)"));
    }
    dbus_message_iter_get_basic(&iter, &notification_path);
    dbus_message_iter_next (&iter);

    if (dbus_message_iter_get_arg_type(&iter) != DBUS_TYPE_STRING) {
        return dbus_message_new_error(message,
				      DBUS_ERROR_INVALID_ARGS,
				      _("Second argument should be a string (resource_id)"));
    }
    dbus_message_iter_get_basic(&iter, &resource_id);
    dbus_message_iter_next (&iter);

    if (dbus_message_iter_has_next(&iter))
        return dbus_message_new_error(message,
                                      DBUS_ERROR_INVALID_ARGS,
                                      _("Too many arguments"));

    /* FIXME: Do the forget; change the NULL return to an ACK if we aren't doing something async */

    return NULL;
}

static DBusMessage*
service_method_create_with_master_password (GkdSecretService *self, DBusMessage *message)
{
	GckBuilder builder = GCK_BUILDER_INIT;
	DBusError derr = DBUS_ERROR_INIT;
	DBusMessageIter iter, array;
	DBusMessage *reply = NULL;
	GkdSecretSecret *secret = NULL;
	GckAttributes *attrs = NULL;
	GError *error = NULL;
	gchar *path;

	/* Parse the incoming message */
	if (!dbus_message_has_signature (message, "a{sv}(oayays)"))
		return NULL;
	if (!dbus_message_iter_init (message, &iter))
		g_return_val_if_reached (NULL);
	dbus_message_iter_recurse (&iter, &array);
	if (!gkd_secret_property_parse_all (&array, SECRET_COLLECTION_INTERFACE, &builder)) {
		gck_builder_clear (&builder);
		return dbus_message_new_error (message, DBUS_ERROR_INVALID_ARGS,
		                               "Invalid properties argument");
	}
	dbus_message_iter_next (&iter);
	secret = gkd_secret_secret_parse (self, message, &iter, &derr);
	if (secret == NULL) {
		gck_builder_clear (&builder);
		return gkd_secret_error_to_reply (message, &derr);
	}

	gck_builder_add_boolean (&builder, CKA_TOKEN, TRUE);
	attrs = gck_attributes_ref_sink (gck_builder_end (&builder));
	path = gkd_secret_create_with_secret (attrs, secret, &error);
	gck_attributes_unref (attrs);
	gkd_secret_secret_free (secret);

	if (path == NULL)
		return gkd_secret_propagate_error (message, "Couldn't create collection", error);

	/* Notify the callers that a collection was created */
	gkd_secret_service_emit_collection_created (self, path);

	reply = dbus_message_new_method_return (message);
	dbus_message_append_args (reply, DBUS_TYPE_OBJECT_PATH, &path, DBUS_TYPE_INVALID);
	g_free (path);

	return reply;
}