577 lines
19 KiB
C
577 lines
19 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 <stdarg.h>
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#include "socket.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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* String prefix which begins the library filename of all client plugins.
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*/
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#define GUAC_PROTOCOL_LIBRARY_PREFIX "libguac-client-"
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/**
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* String suffix which ends the library filename of all client plugins.
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*/
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#define GUAC_PROTOCOL_LIBRARY_SUFFIX ".so"
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/**
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* The maximum number of characters (COUNTING NULL TERMINATOR) to allow
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* for protocol names within the library filename of client plugins.
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*/
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#define GUAC_PROTOCOL_NAME_LIMIT 256
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/**
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* The maximum number of characters (INCLUDING NULL TERMINATOR) that a
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* character array containing the concatenation of the library prefix,
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* protocol name, and suffix can contain, assuming the protocol name is
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* limited to GUAC_PROTOCOL_NAME_LIMIT characters.
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*/
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#define GUAC_PROTOCOL_LIBRARY_LIMIT ( \
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\
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sizeof(GUAC_PROTOCOL_LIBRARY_PREFIX) - 1 /* "libguac-client-" */ \
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+ GUAC_PROTOCOL_NAME_LIMIT - 1 /* [up to 256 chars] */ \
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+ sizeof(GUAC_PROTOCOL_LIBRARY_SUFFIX) - 1 /* ".so" */ \
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+ 1 /* NULL terminator */ \
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\
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)
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typedef struct guac_client guac_client;
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typedef struct guac_client_plugin guac_client_plugin;
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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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* Handler for logging messages
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*/
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typedef void guac_client_log_handler(guac_client* client, const char* format, va_list args);
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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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* The flag set in the mouse button mask when the left mouse button is down.
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*/
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#define GUAC_CLIENT_MOUSE_LEFT 0x01
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/**
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* The flag set in the mouse button mask when the middle mouse button is down.
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*/
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#define GUAC_CLIENT_MOUSE_MIDDLE 0x02
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/**
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* The flag set in the mouse button mask when the right mouse button is down.
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*/
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#define GUAC_CLIENT_MOUSE_RIGHT 0x04
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/**
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* The flag set in the mouse button mask when the mouse scrollwheel is scrolled
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* up. Note that mouse scrollwheels are actually sets of two buttons. One
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* button is pressed and released for an upward scroll, and the other is
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* pressed and released for a downward scroll. Some mice may actually implement
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* these as separate buttons, not a wheel.
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*/
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#define GUAC_CLIENT_MOUSE_SCROLL_UP 0x08
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/**
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* The flag set in the mouse button mask when the mouse scrollwheel is scrolled
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* down. Note that mouse scrollwheels are actually sets of two buttons. One
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* button is pressed and released for an upward scroll, and the other is
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* pressed and released for a downward scroll. Some mice may actually implement
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* these as separate buttons, not a wheel.
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*/
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#define GUAC_CLIENT_MOUSE_SCROLL_DOWN 0x10
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/**
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* The minimum number of buffers to create before allowing free'd buffers to
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* be reclaimed. In the case a protocol rapidly creates, uses, and destroys
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* buffers, this can prevent unnecessary reuse of the same buffer (which
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* would make draw operations unnecessarily synchronous).
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*/
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#define GUAC_BUFFER_POOL_INITIAL_SIZE 1024
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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 GUAC_CLIENT_RUNNING and GUAC_CLIENT_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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GUAC_CLIENT_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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GUAC_CLIENT_STOPPING
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} guac_client_state;
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/**
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* A handle to a client plugin, containing enough information about the
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* plugin to complete the initial protocol handshake and instantiate a new
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* client supporting the protocol provided by the client plugin.
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*/
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struct guac_client_plugin {
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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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* Reference to the init handler of this client plugin. This
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* function will be called when the client plugin is started.
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*/
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guac_client_init_handler* init_handler;
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/**
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* NULL-terminated array of all arguments accepted by this client
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* plugin, in order. The values of these arguments will be passed
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* to the init_handler if the client plugin is started.
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*/
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const char** args;
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};
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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 guac_socket structure to be used to communicate with the web-client.
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* It is expected that the implementor of any Guacamole proxy client will
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* provide their own mechanism of I/O for their protocol. The guac_socket
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* structure is used only to communicate conveniently with the Guacamole
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* web-client.
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*/
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guac_socket* socket;
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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 GUAC_CLIENT_RUNNING. It will remain at
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* GUAC_CLIENT_RUNNING until an event occurs which requires the client to
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* shutdown, at which point the state becomes GUAC_CLIENT_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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guac_timestamp 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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guac_timestamp last_sent_timestamp;
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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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* int 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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* int 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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* int 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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* int 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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* Note that this handler will NOT be called if the client's
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* guac_client_init() function fails.
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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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* int 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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* Handler for logging informational messages. This handler will be called
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* via guac_client_log_info() when the client needs to log information.
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*
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* In general, only programs loading the client should implement this
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* handler, as those are the programs that would provide the logging
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* facilities.
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*
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* Client implementations should expect these handlers to already be
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* set.
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*
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* Example:
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* @code
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* void log_handler(guac_client* client, const char* format, va_list args);
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*
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* void function_of_daemon() {
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*
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* guac_client* client = [pass log_handler to guac_client_plugin_get_client()];
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*
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* }
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* @endcode
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*/
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guac_client_log_handler* log_info_handler;
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/**
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* Handler for logging error messages. This handler will be called
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* via guac_client_log_error() when the client needs to log an error.
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*
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* In general, only programs loading the client should implement this
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* handler, as those are the programs that would provide the logging
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* facilities.
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*
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* Client implementations should expect these handlers to already be
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* set.
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*
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* Example:
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* @code
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* void log_handler(guac_client* client, const char* format, va_list args);
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*
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* void function_of_daemon() {
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*
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* guac_client* client = [pass log_handler to guac_client_plugin_get_client()];
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*
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* }
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* @endcode
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*/
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guac_client_log_handler* log_error_handler;
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/**
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* The index of the next available buffer.
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*/
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int __next_buffer_index;
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/**
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* The head pointer of the list of all available (allocated but not used)
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* buffers.
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*/
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guac_layer* __available_buffers;
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/**
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* Pointer to the last buffer in the list of all available buffers.
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*/
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guac_layer* __last_available_buffer;
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/**
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* The index of the next available layer.
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*/
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int __next_layer_index;
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/**
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* The head pointer of the list of all available (allocated but not used)
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* layers.
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*/
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guac_layer* __available_layers;
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/**
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* Pointer to the last layer in the list of all available layers.
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*/
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guac_layer* __last_available_layer;
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/**
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* The head pointer of the list of all allocated layers, regardless of use
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* status.
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*/
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guac_layer* __all_layers;
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};
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/**
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* Open the plugin which provides support for the given protocol, if it
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* exists.
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*
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* @param protocol The name of the protocol to retrieve the client plugin
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* for.
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* @return The client plugin supporting the given protocol, or NULL if
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* an error occurs or no such plugin exists.
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*/
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guac_client_plugin* guac_client_plugin_open(const char* protocol);
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/**
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* Close the given plugin, releasing all associated resources. This function
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* must be called after use of a client plugin is finished.
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*
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* @param plugin The client plugin to close.
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* @return Zero on success, non-zero if an error occurred while releasing
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* the resources associated with the plugin.
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*/
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int guac_client_plugin_close(guac_client_plugin* plugin);
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/**
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* Initializes the given guac_client using the initialization routine provided
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* by the given guac_client_plugin.
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*
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* @param plugin The client plugin to use to initialize the new client.
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* @param client The guac_client to initialize.
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* @param argc The number of arguments being passed to the client.
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* @param argv All arguments to be passed to the client.
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* @return Zero if initialization was successful, non-zero otherwise.
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*/
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int guac_client_plugin_init_client(guac_client_plugin* plugin,
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guac_client* client, int argc, char** argv);
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/**
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* Returns a new, barebones guac_client. This new guac_client has no handlers
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* set, but is otherwise usable.
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*
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* @return A pointer to the new client.
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*/
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guac_client* guac_client_alloc();
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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_client_free(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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* Logs an informational message in the log used by the given client. The
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* logger used will normally be defined by guacd (or whichever program loads
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* the proxy client) by setting the logging handlers of the client when it is
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* loaded.
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*
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* @param client The proxy client to log an informational message for.
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* @param format A printf-style format string to log.
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* @param ... Arguments to use when filling the format string for printing.
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*/
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void guac_client_log_info(guac_client* client, const char* format, ...);
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/**
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* Logs an error message in the log used by the given client. The logger
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* used will normally be defined by guacd (or whichever program loads the
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* proxy client) by setting the logging handlers of the client when it is
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* loaded.
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*
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* @param client The proxy client to log an error for.
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* @param format A printf-style format string to log.
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* @param ... Arguments to use when filling the format string for printing.
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*/
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void guac_client_log_error(guac_client* client, const char* format, ...);
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/**
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* Logs an informational message in the log used by the given client. The
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* logger used will normally be defined by guacd (or whichever program loads
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* the proxy client) by setting the logging handlers of the client when it is
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|
* loaded.
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*
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* @param client The proxy client to log an informational message for.
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|
* @param format A printf-style format string to log.
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|
* @param ap The va_list containing the arguments to be used when filling the
|
|
* format string for printing.
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|
*/
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void vguac_client_log_info(guac_client* client, const char* format, va_list ap);
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|
|
|
/**
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|
* Logs an error message in the log used by the given client. The logger
|
|
* used will normally be defined by guacd (or whichever program loads the
|
|
* proxy client) by setting the logging handlers of the client when it is
|
|
* loaded.
|
|
*
|
|
* @param client The proxy client to log an error for.
|
|
* @param format A printf-style format string to log.
|
|
* @param ap The va_list containing the arguments to be used when filling the
|
|
* format string for printing.
|
|
*/
|
|
void vguac_client_log_error(guac_client* client, const char* format, va_list ap);
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|
|
|
/**
|
|
* Signals the given client to stop gracefully. This is a completely
|
|
* cooperative signal, and can be ignored by the client or the hosting
|
|
* daemon.
|
|
*
|
|
* @param client The proxy client to signal to stop.
|
|
*/
|
|
void guac_client_stop(guac_client* client);
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|
|
|
/**
|
|
* The default Guacamole client layer, layer 0.
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|
*/
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|
extern const guac_layer* GUAC_DEFAULT_LAYER;
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|
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|
#endif
|