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/* Copyright (c) 2002-2010 Dovecot Sieve authors, see the included COPYING file
*/
#include "lib.h"
#include "str.h"
#include "module-dir.h"
#include "sieve-settings.h"
#include "sieve-extensions.h"
#include "sieve-common.h"
#include "sieve-plugins.h"
/*
* Types
*/
typedef void (*sieve_plugin_load_func_t)
(struct sieve_instance *svinst, void **context);
typedef void (*sieve_plugin_unload_func_t)
(struct sieve_instance *svinst, void *context);
struct sieve_plugin {
struct module *module;
void *context;
struct sieve_plugin *next;
};
/*
* Plugin support
*/
static struct module *sieve_modules = NULL;
static int sieve_modules_refcount = 0;
static struct module *sieve_plugin_module_find(const char *name)
{
struct module *module;
module = sieve_modules;
while ( module != NULL ) {
const char *mod_name;
size_t len;
/* Strip module names */
len = strlen(module->name);
if (len > 7 && strcmp(module->name + len - 7, "_plugin") == 0)
mod_name = t_strndup(module->name, len - 7);
else
mod_name = module->name;
if ( strcmp(mod_name, name) == 0 )
return module;
module = module->next;
}
return NULL;
}
void sieve_plugins_load(struct sieve_instance *svinst, const char *path, const char *plugins)
{
struct module *module;
const char **module_names;
string_t *missing_modules;
unsigned int i;
/* Determine what to load */
if ( path == NULL && plugins == NULL ) {
path = sieve_setting_get(svinst, "sieve_plugin_dir");
plugins = sieve_setting_get(svinst, "sieve_plugins");
}
if ( plugins == NULL || *plugins == '\0' )
return;
if ( path == NULL || *path == '\0' )
path = MODULEDIR"/sieve";
module_names = t_strsplit_spaces(plugins, ", ");
for (i = 0; module_names[i] != NULL; i++) {
/* Allow giving the module names also in non-base form. */
module_names[i] = module_file_get_name(module_names[i]);
}
/* Load missing modules
* FIXME: Dovecot should provide this functionality (v2.0 does)
*/
missing_modules = t_str_new(256);
for (i = 0; module_names[i] != NULL; i++) {
const char *name = module_names[i];
if ( sieve_plugin_module_find(name) == NULL ) {
if ( i > 0 ) str_append_c(missing_modules, ' ');
str_append(missing_modules, name);
}
}
if ( str_len(missing_modules) > 0 ) {
struct module *new_modules = module_dir_load
(path, str_c(missing_modules), TRUE, SIEVE_VERSION);
if ( sieve_modules == NULL ) {
/* No modules loaded yet */
sieve_modules = new_modules;
} else {
/* Find the end of the list */
module = sieve_modules;
while ( module != NULL && module->next != NULL )
module = module->next;
/* Add newly loaded modules */
module->next = new_modules;
}
}
/* Call plugin load functions for this Sieve instance */
if ( svinst->plugins == NULL ) {
sieve_modules_refcount++;
}
for (i = 0; module_names[i] != NULL; i++) {
struct sieve_plugin *plugin;
const char *name = module_names[i];
sieve_plugin_load_func_t load_func;
/* Find the module */
module = sieve_plugin_module_find(name);
i_assert(module != NULL);
/* Check whether the plugin is already loaded in this instance */
plugin = svinst->plugins;
while ( plugin != NULL ) {
if ( plugin->module == module )
break;
plugin = plugin->next;
}
/* Skip it if it is loaded already */
if ( plugin != NULL )
continue;
/* Create plugin list item */
plugin = p_new(svinst->pool, struct sieve_plugin, 1);
plugin->module = module;
/* Call load function */
load_func = (sieve_plugin_load_func_t) module_get_symbol
(module, t_strdup_printf("%s_load", module->name));
if ( load_func != NULL ) {
load_func(svinst, &plugin->context);
}
/* Add plugin to the instance */
if ( svinst->plugins == NULL )
svinst->plugins = plugin;
else {
struct sieve_plugin *plugin_last;
plugin_last = svinst->plugins;
while ( plugin_last->next != NULL )
plugin_last = plugin_last->next;
plugin_last->next = plugin;
}
}
}
void sieve_plugins_unload(struct sieve_instance *svinst)
{
struct sieve_plugin *plugin;
if ( svinst->plugins == NULL )
return;
/* Call plugin unload functions for this instance */
plugin = svinst->plugins;
while ( plugin != NULL ) {
struct module *module = plugin->module;
sieve_plugin_unload_func_t unload_func;
unload_func = (sieve_plugin_unload_func_t)module_get_symbol
(module, t_strdup_printf("%s_unload", module->name));
if ( unload_func != NULL ) {
unload_func(svinst, plugin->context);
}
plugin = plugin->next;
}
/* Physically unload modules */
i_assert(sieve_modules_refcount > 0);
if ( --sieve_modules_refcount != 0 )
return;
module_dir_unload(&sieve_modules);
}
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