553 lines
18 KiB
C
553 lines
18 KiB
C
|
|
/* ***** BEGIN LICENSE BLOCK *****
|
|
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
|
|
*
|
|
* The contents of this file are subject to the Mozilla Public License Version
|
|
* 1.1 (the "License"); you may not use this file except in compliance with
|
|
* the License. You may obtain a copy of the License at
|
|
* http://www.mozilla.org/MPL/
|
|
*
|
|
* Software distributed under the License is distributed on an "AS IS" basis,
|
|
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
|
|
* for the specific language governing rights and limitations under the
|
|
* License.
|
|
*
|
|
* The Original Code is libguac.
|
|
*
|
|
* The Initial Developer of the Original Code is
|
|
* Michael Jumper.
|
|
* Portions created by the Initial Developer are Copyright (C) 2010
|
|
* the Initial Developer. All Rights Reserved.
|
|
*
|
|
* Contributor(s):
|
|
*
|
|
* Alternatively, the contents of this file may be used under the terms of
|
|
* either the GNU General Public License Version 2 or later (the "GPL"), or
|
|
* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
|
|
* in which case the provisions of the GPL or the LGPL are applicable instead
|
|
* of those above. If you wish to allow use of your version of this file only
|
|
* under the terms of either the GPL or the LGPL, and not to allow others to
|
|
* use your version of this file under the terms of the MPL, indicate your
|
|
* decision by deleting the provisions above and replace them with the notice
|
|
* and other provisions required by the GPL or the LGPL. If you do not delete
|
|
* the provisions above, a recipient may use your version of this file under
|
|
* the terms of any one of the MPL, the GPL or the LGPL.
|
|
*
|
|
* ***** END LICENSE BLOCK ***** */
|
|
|
|
|
|
#ifndef _GUAC_CLIENT_H
|
|
#define _GUAC_CLIENT_H
|
|
|
|
#include <stdarg.h>
|
|
|
|
#include "socket.h"
|
|
#include "protocol.h"
|
|
|
|
/**
|
|
* Provides functions and structures required for defining (and handling) a proxy client.
|
|
*
|
|
* @file client.h
|
|
*/
|
|
|
|
typedef struct guac_client guac_client;
|
|
typedef struct guac_client_plugin guac_client_plugin;
|
|
|
|
/**
|
|
* Handler for server messages (where "server" refers to the server that
|
|
* the proxy client is connected to).
|
|
*/
|
|
typedef int guac_client_handle_messages(guac_client* client);
|
|
|
|
/**
|
|
* Handler for Guacamole mouse events.
|
|
*/
|
|
typedef int guac_client_mouse_handler(guac_client* client, int x, int y, int button_mask);
|
|
|
|
/**
|
|
* Handler for Guacamole key events.
|
|
*/
|
|
typedef int guac_client_key_handler(guac_client* client, int keysym, int pressed);
|
|
|
|
/**
|
|
* Handler for Guacamole clipboard events.
|
|
*/
|
|
typedef int guac_client_clipboard_handler(guac_client* client, char* copied);
|
|
|
|
/**
|
|
* Handler for freeing up any extra data allocated by the client
|
|
* implementation.
|
|
*/
|
|
typedef int guac_client_free_handler(guac_client* client);
|
|
|
|
/**
|
|
* Handler for logging messages
|
|
*/
|
|
typedef void guac_client_log_handler(guac_client* client, const char* format, va_list args);
|
|
|
|
/**
|
|
* Handler which should initialize the given guac_client.
|
|
*/
|
|
typedef int guac_client_init_handler(guac_client* client, int argc, char** argv);
|
|
|
|
/**
|
|
* The flag set in the mouse button mask when the left mouse button is down.
|
|
*/
|
|
#define GUAC_CLIENT_MOUSE_LEFT 0x01
|
|
|
|
/**
|
|
* The flag set in the mouse button mask when the middle mouse button is down.
|
|
*/
|
|
#define GUAC_CLIENT_MOUSE_MIDDLE 0x02
|
|
|
|
/**
|
|
* The flag set in the mouse button mask when the right mouse button is down.
|
|
*/
|
|
#define GUAC_CLIENT_MOUSE_RIGHT 0x04
|
|
|
|
/**
|
|
* The flag set in the mouse button mask when the mouse scrollwheel is scrolled
|
|
* up. Note that mouse scrollwheels are actually sets of two buttons. One
|
|
* button is pressed and released for an upward scroll, and the other is
|
|
* pressed and released for a downward scroll. Some mice may actually implement
|
|
* these as separate buttons, not a wheel.
|
|
*/
|
|
#define GUAC_CLIENT_MOUSE_SCROLL_UP 0x08
|
|
|
|
/**
|
|
* The flag set in the mouse button mask when the mouse scrollwheel is scrolled
|
|
* down. Note that mouse scrollwheels are actually sets of two buttons. One
|
|
* button is pressed and released for an upward scroll, and the other is
|
|
* pressed and released for a downward scroll. Some mice may actually implement
|
|
* these as separate buttons, not a wheel.
|
|
*/
|
|
#define GUAC_CLIENT_MOUSE_SCROLL_DOWN 0x10
|
|
|
|
/**
|
|
* The minimum number of buffers to create before allowing free'd buffers to
|
|
* be reclaimed. In the case a protocol rapidly creates, uses, and destroys
|
|
* buffers, this can prevent unnecessary reuse of the same buffer (which
|
|
* would make draw operations unnecessarily synchronous).
|
|
*/
|
|
#define GUAC_BUFFER_POOL_INITIAL_SIZE 1024
|
|
|
|
/**
|
|
* Possible current states of the Guacamole client. Currently, the only
|
|
* two states are GUAC_CLIENT_RUNNING and GUAC_CLIENT_STOPPING.
|
|
*/
|
|
typedef enum guac_client_state {
|
|
|
|
/**
|
|
* The state of the client from when it has been allocated by the main
|
|
* daemon until it is killed or disconnected.
|
|
*/
|
|
GUAC_CLIENT_RUNNING,
|
|
|
|
/**
|
|
* The state of the client when a stop has been requested, signalling the
|
|
* I/O threads to shutdown.
|
|
*/
|
|
GUAC_CLIENT_STOPPING
|
|
|
|
} guac_client_state;
|
|
|
|
/**
|
|
* A handle to a client plugin, containing enough information about the
|
|
* plugin to complete the initial protocol handshake and instantiate a new
|
|
* client supporting the protocol provided by the client plugin.
|
|
*/
|
|
struct guac_client_plugin {
|
|
|
|
/**
|
|
* Reference to dlopen'd client plugin.
|
|
*/
|
|
void* __client_plugin_handle;
|
|
|
|
/**
|
|
* Reference to the init handler of this client plugin. This
|
|
* function will be called when the client plugin is started.
|
|
*/
|
|
guac_client_init_handler* init_handler;
|
|
|
|
/**
|
|
* NULL-terminated array of all arguments accepted by this client
|
|
* plugin, in order. The values of these arguments will be passed
|
|
* to the init_handler if the client plugin is started.
|
|
*/
|
|
const char** args;
|
|
|
|
};
|
|
|
|
/**
|
|
* Guacamole proxy client.
|
|
*
|
|
* Represents a Guacamole proxy client (the client which communicates to
|
|
* a server on behalf of Guacamole, on behalf of the web-client).
|
|
*/
|
|
struct guac_client {
|
|
|
|
/**
|
|
* The guac_socket structure to be used to communicate with the web-client.
|
|
* It is expected that the implementor of any Guacamole proxy client will
|
|
* provide their own mechanism of I/O for their protocol. The guac_socket
|
|
* structure is used only to communicate conveniently with the Guacamole
|
|
* web-client.
|
|
*/
|
|
guac_socket* socket;
|
|
|
|
/**
|
|
* The current state of the client. When the client is first allocated,
|
|
* this will be initialized to GUAC_CLIENT_RUNNING. It will remain at
|
|
* GUAC_CLIENT_RUNNING until an event occurs which requires the client to
|
|
* shutdown, at which point the state becomes GUAC_CLIENT_STOPPING.
|
|
*/
|
|
guac_client_state state;
|
|
|
|
/**
|
|
* The time (in milliseconds) of receipt of the last sync message from
|
|
* the client.
|
|
*/
|
|
guac_timestamp last_received_timestamp;
|
|
|
|
/**
|
|
* The time (in milliseconds) that the last sync message was sent to the
|
|
* client.
|
|
*/
|
|
guac_timestamp last_sent_timestamp;
|
|
|
|
/**
|
|
* Arbitrary reference to proxy client-specific data. Implementors of a
|
|
* Guacamole proxy client can store any data they want here, which can then
|
|
* be retrieved as necessary in the message handlers.
|
|
*/
|
|
void* data;
|
|
|
|
/**
|
|
* Handler for server messages. If set, this function will be called
|
|
* occasionally by the Guacamole proxy to give the client a chance to
|
|
* handle messages from whichever server it is connected to.
|
|
*
|
|
* Example:
|
|
* @code
|
|
* int handle_messages(guac_client* client);
|
|
*
|
|
* int guac_client_init(guac_client* client, int argc, char** argv) {
|
|
* client->handle_messages = handle_messages;
|
|
* }
|
|
* @endcode
|
|
*/
|
|
guac_client_handle_messages* handle_messages;
|
|
|
|
/**
|
|
* Handler for mouse events sent by the Gaucamole web-client.
|
|
*
|
|
* The handler takes the integer mouse X and Y coordinates, as well as
|
|
* a button mask containing the bitwise OR of all button values currently
|
|
* being pressed. Those values are:
|
|
*
|
|
* <table>
|
|
* <tr><th>Button</th> <th>Value</th></tr>
|
|
* <tr><td>Left</td> <td>1</td></tr>
|
|
* <tr><td>Middle</td> <td>2</td></tr>
|
|
* <tr><td>Right</td> <td>4</td></tr>
|
|
* <tr><td>Scrollwheel Up</td> <td>8</td></tr>
|
|
* <tr><td>Scrollwheel Down</td><td>16</td></tr>
|
|
* </table>
|
|
|
|
* Example:
|
|
* @code
|
|
* int mouse_handler(guac_client* client, int x, int y, int button_mask);
|
|
*
|
|
* int guac_client_init(guac_client* client, int argc, char** argv) {
|
|
* client->mouse_handler = mouse_handler;
|
|
* }
|
|
* @endcode
|
|
*/
|
|
guac_client_mouse_handler* mouse_handler;
|
|
|
|
/**
|
|
* Handler for key events sent by the Guacamole web-client.
|
|
*
|
|
* The handler takes the integer X11 keysym associated with the key
|
|
* being pressed/released, and an integer representing whether the key
|
|
* is being pressed (1) or released (0).
|
|
*
|
|
* Example:
|
|
* @code
|
|
* int key_handler(guac_client* client, int keysym, int pressed);
|
|
*
|
|
* int guac_client_init(guac_client* client, int argc, char** argv) {
|
|
* client->key_handler = key_handler;
|
|
* }
|
|
* @endcode
|
|
*/
|
|
guac_client_key_handler* key_handler;
|
|
|
|
/**
|
|
* Handler for clipboard events sent by the Guacamole web-client. This
|
|
* handler will be called whenever the web-client sets the data of the
|
|
* clipboard.
|
|
*
|
|
* This handler takes a single string which contains the text which
|
|
* has been set in the clipboard. This text is already unescaped from
|
|
* the Guacamole escaped version sent within the clipboard message
|
|
* in the protocol.
|
|
*
|
|
* Example:
|
|
* @code
|
|
* int clipboard_handler(guac_client* client, char* copied);
|
|
*
|
|
* int guac_client_init(guac_client* client, int argc, char** argv) {
|
|
* client->clipboard_handler = clipboard_handler;
|
|
* }
|
|
* @endcode
|
|
*/
|
|
guac_client_clipboard_handler* clipboard_handler;
|
|
|
|
/**
|
|
* Handler for freeing data when the client is being unloaded.
|
|
*
|
|
* This handler will be called when the client needs to be unloaded
|
|
* by the proxy, and any data allocated by the proxy client should be
|
|
* freed.
|
|
*
|
|
* Note that this handler will NOT be called if the client's
|
|
* guac_client_init() function fails.
|
|
*
|
|
* Implement this handler if you store data inside the client.
|
|
*
|
|
* Example:
|
|
* @code
|
|
* int free_handler(guac_client* client);
|
|
*
|
|
* int guac_client_init(guac_client* client, int argc, char** argv) {
|
|
* client->free_handler = free_handler;
|
|
* }
|
|
* @endcode
|
|
*/
|
|
guac_client_free_handler* free_handler;
|
|
|
|
/**
|
|
* Handler for logging informational messages. This handler will be called
|
|
* via guac_client_log_info() when the client needs to log information.
|
|
*
|
|
* In general, only programs loading the client should implement this
|
|
* handler, as those are the programs that would provide the logging
|
|
* facilities.
|
|
*
|
|
* Client implementations should expect these handlers to already be
|
|
* set.
|
|
*
|
|
* Example:
|
|
* @code
|
|
* void log_handler(guac_client* client, const char* format, va_list args);
|
|
*
|
|
* void function_of_daemon() {
|
|
*
|
|
* guac_client* client = [client from guac_client_plugin_get_client()];
|
|
*
|
|
* client->log_info_handler = log_handler;
|
|
*
|
|
* }
|
|
* @endcode
|
|
*/
|
|
guac_client_log_handler* log_info_handler;
|
|
|
|
|
|
/**
|
|
* Handler for logging error messages. This handler will be called
|
|
* via guac_client_log_error() when the client needs to log an error.
|
|
*
|
|
* In general, only programs loading the client should implement this
|
|
* handler, as those are the programs that would provide the logging
|
|
* facilities.
|
|
*
|
|
* Client implementations should expect these handlers to already be
|
|
* set.
|
|
*
|
|
* Example:
|
|
* @code
|
|
* void log_handler(guac_client* client, const char* format, va_list args);
|
|
*
|
|
* void function_of_daemon() {
|
|
*
|
|
* guac_client* client = [client from guac_client_plugin_get_client()];
|
|
*
|
|
* client->log_error_handler = log_handler;
|
|
*
|
|
* }
|
|
* @endcode
|
|
*/
|
|
guac_client_log_handler* log_error_handler;
|
|
|
|
/**
|
|
* The index of the next available buffer.
|
|
*/
|
|
int __next_buffer_index;
|
|
|
|
/**
|
|
* The head pointer of the list of all available (allocated but not used)
|
|
* buffers.
|
|
*/
|
|
guac_layer* __available_buffers;
|
|
|
|
/**
|
|
* Pointer to the last buffer in the list of all available buffers.
|
|
*/
|
|
guac_layer* __last_available_buffer;
|
|
|
|
/**
|
|
* The head pointer of the list of all allocated layers, regardless of use
|
|
* status.
|
|
*/
|
|
guac_layer* __all_layers;
|
|
|
|
};
|
|
|
|
/**
|
|
* Open the plugin which provides support for the given protocol, if it
|
|
* exists.
|
|
*
|
|
* @param protocol The name of the protocol to retrieve the client plugin
|
|
* for.
|
|
* @return The client plugin supporting the given protocol, or NULL if
|
|
* an error occurs or no such plugin exists.
|
|
*/
|
|
guac_client_plugin* guac_client_plugin_open(const char* protocol);
|
|
|
|
/**
|
|
* Close the given plugin, releasing all associated resources. This function
|
|
* must be called after use of a client plugin is finished.
|
|
*
|
|
* @param plugin The client plugin to close.
|
|
* @return Zero on success, non-zero if an error occurred while releasing
|
|
* the resources associated with the plugin.
|
|
*/
|
|
int guac_client_plugin_close(guac_client_plugin* plugin);
|
|
|
|
/**
|
|
* Initialize and return a new guac_client. The pluggable client will be
|
|
* initialized using the arguments provided.
|
|
*
|
|
* @param plugin The client plugin to use to create the new client.
|
|
* @param socket The guac_socket the client should use for communication.
|
|
* @param argc The number of arguments being passed to the client.
|
|
* @param argv All arguments to be passed to the client.
|
|
* @return A pointer to the newly initialized client.
|
|
*/
|
|
guac_client* guac_client_plugin_get_client(guac_client_plugin* plugin,
|
|
guac_socket* socket, int argc, char** argv);
|
|
|
|
/**
|
|
* Free all resources associated with the given client.
|
|
*
|
|
* @param client The proxy client to free all reasources of.
|
|
*/
|
|
void guac_client_free(guac_client* client);
|
|
|
|
/**
|
|
* Call the appropriate handler defined by the given client for the given
|
|
* instruction. A comparison is made between the instruction opcode and the
|
|
* initial handler lookup table defined in client-handlers.c. The intial
|
|
* handlers will in turn call the client's handler (if defined).
|
|
*
|
|
* @param client The proxy client whose handlers should be called.
|
|
* @param instruction The instruction to pass to the proxy client via the
|
|
* appropriate handler.
|
|
*/
|
|
int guac_client_handle_instruction(guac_client* client, guac_instruction* instruction);
|
|
|
|
/**
|
|
* Allocates a new buffer (invisible layer). An arbitrary index is
|
|
* automatically assigned if no existing buffer is available for use.
|
|
*
|
|
* @param client The proxy client to allocate the buffer for.
|
|
* @return The next available buffer, or a newly allocated buffer.
|
|
*/
|
|
guac_layer* guac_client_alloc_buffer(guac_client* client);
|
|
|
|
/**
|
|
* Allocates a new layer. The layer will be given the specified index,
|
|
* even if the layer returned was a previously used (and free'd) layer.
|
|
*
|
|
* @param client The proxy client to allocate the layer buffer for.
|
|
* @param index The index of the layer to allocate.
|
|
* @return The next available layer, or a newly allocated layer.
|
|
*/
|
|
guac_layer* guac_client_alloc_layer(guac_client* client, int index);
|
|
|
|
/**
|
|
* Returns the given buffer to the pool of available buffers, such that it
|
|
* can be reused by any subsequent call to guac_client_allow_buffer().
|
|
*
|
|
* @param client The proxy client to return the buffer to.
|
|
* @param layer The buffer to return to the pool of available buffers.
|
|
*/
|
|
void guac_client_free_buffer(guac_client* client, guac_layer* layer);
|
|
|
|
/**
|
|
* Logs an informational 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 informational message for.
|
|
* @param format A printf-style format string to log.
|
|
* @param ... Arguments to use when filling the format string for printing.
|
|
*/
|
|
void guac_client_log_info(guac_client* client, const char* format, ...);
|
|
|
|
/**
|
|
* 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 ... Arguments to use when filling the format string for printing.
|
|
*/
|
|
void guac_client_log_error(guac_client* client, const char* format, ...);
|
|
|
|
/**
|
|
* Logs an informational 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 informational message 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_info(guac_client* client, const char* format, va_list ap);
|
|
|
|
/**
|
|
* 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);
|
|
|
|
/**
|
|
* 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);
|
|
|
|
/**
|
|
* The default Guacamole client layer, layer 0.
|
|
*/
|
|
extern const guac_layer* GUAC_DEFAULT_LAYER;
|
|
|
|
#endif
|