145 lines
5.1 KiB
C
145 lines
5.1 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_PLUGIN_H
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#define _GUAC_PLUGIN_H
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#include "client.h"
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/**
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* Provides functions and structures required for handling a client plugin.
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*
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* @file plugin.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_plugin guac_client_plugin;
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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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* 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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#endif
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