332 lines
11 KiB
C
332 lines
11 KiB
C
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/* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is libguac.
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*
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* The Initial Developer of the Original Code is
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* Michael Jumper.
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* Portions created by the Initial Developer are Copyright (C) 2010
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either the GNU General Public License Version 2 or later (the "GPL"), or
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* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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#ifndef _GUAC_CLIENT_H
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#define _GUAC_CLIENT_H
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#include "guacio.h"
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#include "protocol.h"
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/**
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* Provides functions and structures required for defining (and handling) a proxy client.
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*
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* @file client.h
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*/
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/**
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* The time to allow between sync responses in milliseconds. If a sync
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* instruction is sent to the client and no response is received within this
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* timeframe, server messages will not be handled until a sync instruction is
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* received from the client.
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*/
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#define GUAC_SYNC_THRESHOLD 500
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/**
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* The time to allow between server sync messages in milliseconds. A sync
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* message from the server will be sent every GUAC_SYNC_FREQUENCY milliseconds.
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* As this will induce a response from a client that is not malfunctioning,
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* this is used to detect when a client has died. This must be set to a
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* reasonable value to avoid clients being disconnected unnecessarily due
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* to timeout.
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*/
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#define GUAC_SYNC_FREQUENCY 5000
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/**
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* The amount of time to wait after handling server messages. If a client
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* plugin has a message handler, and sends instructions when server messages
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* are being handled, there will be a pause of this many milliseconds before
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* the next call to the message handler.
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*/
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#define GUAC_SERVER_MESSAGE_HANDLE_FREQUENCY 50
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typedef struct guac_client guac_client;
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/**
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* Handler for server messages (where "server" refers to the server that
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* the proxy client is connected to).
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*/
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typedef int guac_client_handle_messages(guac_client* client);
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/**
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* Handler for Guacamole mouse events.
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*/
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typedef int guac_client_mouse_handler(guac_client* client, int x, int y, int button_mask);
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/**
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* Handler for Guacamole key events.
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*/
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typedef int guac_client_key_handler(guac_client* client, int keysym, int pressed);
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/**
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* Handler for Guacamole clipboard events.
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*/
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typedef int guac_client_clipboard_handler(guac_client* client, char* copied);
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/**
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* Handler for freeing up any extra data allocated by the client
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* implementation.
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*/
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typedef int guac_client_free_handler(guac_client* client);
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/**
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* Possible current states of the Guacamole client. Currently, the only
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* two states are RUNNING and STOPPING.
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*/
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typedef enum guac_client_state {
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/**
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* The state of the client from when it has been allocated by the main
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* daemon until it is killed or disconnected.
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*/
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RUNNING,
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/**
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* The state of the client when a stop has been requested, signalling the
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* I/O threads to shutdown.
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*/
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STOPPING
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} guac_client_state;
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/**
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* Guacamole proxy client.
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*
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* Represents a Guacamole proxy client (the client which communicates to
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* a server on behalf of Guacamole, on behalf of the web-client).
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*/
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struct guac_client {
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/**
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* The GUACIO structure to be used to communicate with the web-client. It is
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* expected that the implementor of any Guacamole proxy client will provide
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* their own mechanism of I/O for their protocol. The GUACIO structure is
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* used only to communicate conveniently with the Guacamole web-client.
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*/
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GUACIO* io;
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/**
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* The current state of the client. When the client is first allocated,
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* this will be initialized to RUNNING. It will remain at RUNNING until
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* an event occurs which requires the client to shutdown, at which point
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* the state becomes STOPPING.
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*/
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guac_client_state state;
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/**
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* The time (in milliseconds) of receipt of the last sync message from
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* the client.
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*/
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long last_received_timestamp;
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/**
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* The time (in milliseconds) that the last sync message was sent to the
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* client.
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*/
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long last_sent_timestamp;
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/**
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* Reference to dlopen'd client plugin.
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*/
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void* client_plugin_handle;
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/**
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* Arbitrary reference to proxy client-specific data. Implementors of a
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* Guacamole proxy client can store any data they want here, which can then
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* be retrieved as necessary in the message handlers.
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*/
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void* data;
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/**
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* Handler for server messages. If set, this function will be called
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* occasionally by the Guacamole proxy to give the client a chance to
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* handle messages from whichever server it is connected to.
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*
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* Example:
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* @code
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* void handle_messages(guac_client* client);
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*
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* int guac_client_init(guac_client* client, int argc, char** argv) {
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* client->handle_messages = handle_messages;
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* }
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* @endcode
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*/
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guac_client_handle_messages* handle_messages;
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/**
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* Handler for mouse events sent by the Gaucamole web-client.
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*
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* The handler takes the integer mouse X and Y coordinates, as well as
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* a button mask containing the bitwise OR of all button values currently
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* being pressed. Those values are:
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*
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* <table>
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* <tr><th>Button</th> <th>Value</th></tr>
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* <tr><td>Left</td> <td>1</td></tr>
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* <tr><td>Middle</td> <td>2</td></tr>
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* <tr><td>Right</td> <td>4</td></tr>
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* <tr><td>Scrollwheel Up</td> <td>8</td></tr>
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* <tr><td>Scrollwheel Down</td><td>16</td></tr>
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* </table>
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* Example:
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* @code
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* void mouse_handler(guac_client* client, int x, int y, int button_mask);
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*
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* int guac_client_init(guac_client* client, int argc, char** argv) {
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* client->mouse_handler = mouse_handler;
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* }
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* @endcode
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*/
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guac_client_mouse_handler* mouse_handler;
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/**
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* Handler for key events sent by the Guacamole web-client.
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*
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* The handler takes the integer X11 keysym associated with the key
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* being pressed/released, and an integer representing whether the key
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* is being pressed (1) or released (0).
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*
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* Example:
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* @code
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* void key_handler(guac_client* client, int keysym, int pressed);
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*
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* int guac_client_init(guac_client* client, int argc, char** argv) {
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* client->key_handler = key_handler;
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* }
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* @endcode
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*/
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guac_client_key_handler* key_handler;
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/**
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* Handler for clipboard events sent by the Guacamole web-client. This
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* handler will be called whenever the web-client sets the data of the
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* clipboard.
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*
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* This handler takes a single string which contains the text which
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* has been set in the clipboard. This text is already unescaped from
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* the Guacamole escaped version sent within the clipboard message
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* in the protocol.
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*
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* Example:
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* @code
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* void clipboard_handler(guac_client* client, char* copied);
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*
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* int guac_client_init(guac_client* client, int argc, char** argv) {
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* client->clipboard_handler = clipboard_handler;
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* }
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* @endcode
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*/
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guac_client_clipboard_handler* clipboard_handler;
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/**
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* Handler for freeing data when the client is being unloaded.
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*
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* This handler will be called when the client needs to be unloaded
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* by the proxy, and any data allocated by the proxy client should be
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* freed.
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*
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* Implement this handler if you store data inside the client.
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*
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* Example:
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* @code
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* void free_handler(guac_client* client);
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*
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* int guac_client_init(guac_client* client, int argc, char** argv) {
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* client->free_handler = free_handler;
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* }
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* @endcode
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*/
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guac_client_free_handler* free_handler;
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};
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/**
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* Handler which should initialize the given guac_client.
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*/
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typedef int guac_client_init_handler(guac_client* client, int argc, char** argv);
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/**
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* Initialize and return a new guac_client. The pluggable client will be chosen based on
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* the first connect message received on the given file descriptor.
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*
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* @param client_fd The file descriptor associated with the socket associated with the connection to the
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* web-client tunnel.
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* @return A pointer to the newly initialized client.
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*/
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guac_client* guac_get_client(int client_fd);
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/**
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* Enter the main network message handling loop for the given client.
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*
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* @param client The proxy client to start handling messages of/for.
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* @return Zero if the client successfully started, non-zero if an error
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* occurs during startup. Note that this function will still return
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* zero if an error occurs while the client is running.
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*/
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int guac_start_client(guac_client* client);
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/**
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* Free all resources associated with the given client.
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*
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* @param client The proxy client to free all reasources of.
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*/
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void guac_free_client(guac_client* client);
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/**
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* Call the appropriate handler defined by the given client for the given
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* instruction. A comparison is made between the instruction opcode and the
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* initial handler lookup table defined in client-handlers.c. The intial
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* handlers will in turn call the client's handler (if defined).
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*
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* @param client The proxy client whose handlers should be called.
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* @param instruction The instruction to pass to the proxy client via the
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* appropriate handler.
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*/
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int guac_client_handle_instruction(guac_client* client, guac_instruction* instruction);
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/**
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* Signal the given client to stop. This will set the state of the given client
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* to STOPPING, which signals the I/O threads to shutdown, and ultimately
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* results in shutdown of the client.
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*
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* @param client The proxy client to stop.
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*/
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void guac_client_stop(guac_client* client);
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#endif
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