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/* plugins.c - plugin handling code
*
* This program is part of Crank, a cryptanalysis tool
* Copyright (C) 2000 Matthew Russell
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License (LICENSE) for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
* USA
*/
#include "crank.h"
/* External variables */
extern char *text;
/* Global variables */
plugin_data *plugin_list = NULL;
plugin_data *current_plugin; /* The current (mode) plugin */
int number_of_plugins = 0;
/* Null Widget for default start */
static void null_init(void) {;}
static int null_boot(void) {return PLUGIN_BOOT_OK;}
static float null_fitness(char *text) {return 0.0;}
static GtkWidget *null_widget(char *text) {return gtk_hbox_new(TRUE, 0);}
plugin_data null_plugin = {"", "", "", "", INTERFACE_VERSION, PLUGIN_MODE, "",
null_boot, null_init, null_init, null_widget, (char *(*)(char *)) g_strdup, null_init, null_fitness, NULL};
float (*global_fitness)(char *) = null_fitness;
/* Load a symbol from the plugin into the identically named element */
/* of a plugin_data structure casting it appropriately along the way. */
/* If an error is encountered, the loop is continued to the next directory entry */
#define LOAD_SYMBOL(SYMBOL, CAST) if(!g_module_symbol(plugin, #SYMBOL, plugin_symbol)) { \
g_warning("Error loading plugin: %s - '" #SYMBOL "' not found", d->d_name); \
free(new_plugin); \
continue; \
} \
new_plugin->SYMBOL = CAST (*plugin_symbol); \
/* Initial finding and 'parsing' plugins */
void load_plugins(void) {
DIR *plugin_dir;
struct dirent *d;
GModule *plugin;
char buf[1024];
plugin_data *new_plugin; /* LOAD_SYMBOL uses this to build up a new plugin record */
gpointer *plugin_symbol; /* temp var for LOAD_SYMBOL */
plugin_symbol = malloc(sizeof(gpointer));
if (!g_module_supported()) {
g_warning("Plugins not supported on this platform.");
return;
}
if (!(plugin_dir = opendir(PLUGIN_DIR))) {
g_warning("Could not open plugin directory - %s", PLUGIN_DIR);
return;
}
/* Loop over each file in the plugin directory */
while ((d = readdir(plugin_dir))) {
if (d->d_name[0] == '.') /* Skip dotfiles, dirup etc. */
continue;
sprintf(buf, "%s%c%s", PLUGIN_DIR, G_DIR_SEPARATOR, d->d_name);
if (!(plugin = g_module_open(buf, 0))) {
g_warning("Error loading plugin: %s", g_module_error());
continue;
}
new_plugin = malloc(sizeof(plugin_data));
/* Symbol Type to cast into (or dereference)*/
/* ------ ----------------- */
LOAD_SYMBOL(name, (char *) );
LOAD_SYMBOL(version, (char *) );
LOAD_SYMBOL(author, (char *) );
LOAD_SYMBOL(plugin_type, * (int *) );
LOAD_SYMBOL(description, (char *) );
LOAD_SYMBOL(interface_version, * (int *) );
LOAD_SYMBOL(boot, (int (*)()) );
if (new_plugin->plugin_type == PLUGIN_FLOATING || new_plugin->plugin_type == PLUGIN_MODE) {
LOAD_SYMBOL(menu_string, (char *) );
LOAD_SYMBOL(make_widget, (GtkWidget *(*)(char *)) );
}
if (new_plugin->plugin_type == PLUGIN_MODE) {
LOAD_SYMBOL(init_plugin, (void (*)()) );
LOAD_SYMBOL(deactivate_plugin, (void (*)()) );
LOAD_SYMBOL(transform, (char *(*)(char *)) );
LOAD_SYMBOL(reset, (void (*)()) );
}
if (new_plugin->plugin_type == PLUGIN_FITNESS) {
LOAD_SYMBOL(fitness, (float (*)(char *)) );
/* FIXME: Fitness manager */
global_fitness = new_plugin->fitness;
}
/* Check for incompatible version */
if (new_plugin->interface_version != INTERFACE_VERSION)
g_warning("%s - plugin uses newer interface than Crank.", d->d_name);
/* Run the plugin's boot function */
if(new_plugin->boot() == PLUGIN_BOOT_FAIL) {
g_warning("Error loading plugin: %s - plugin boot failed.", d->d_name);
continue;
}
/* Add the plugin to the list */
new_plugin->next = plugin_list;
plugin_list = new_plugin;
g_message("Plugin loaded: %s v%s", new_plugin->name, new_plugin->version);
number_of_plugins++;
}
if (!number_of_plugins)
g_warning("Warning: No valid plugins found.");
else
g_message("%d plugin%s loaded.", number_of_plugins, (number_of_plugins == 1) ? "" : "s");
free(plugin_symbol);
}
/* Return source text (should this be strcpy'd?) */
char *get_text(void) {
return text;
}
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