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/*
* Asterisk -- An open source telephony toolkit.
*
* Copyright (C) 2008, Digium, Inc.
*
* Russell Bryant <russell@digium.com>
* Tilghman Lesher <func_config__200803@the-tilghman.com>
*
* See http://www.asterisk.org for more information about
* the Asterisk project. Please do not directly contact
* any of the maintainers of this project for assistance;
* the project provides a web site, mailing lists and IRC
* channels for your use.
*
* This program is free software, distributed under the terms of
* the GNU General Public License Version 2. See the LICENSE file
* at the top of the source tree.
*/
/*! \file
*
* \brief A function to retrieve variables from an Asterisk configuration file
*
* \author Russell Bryant <russell@digium.com>
* \author Tilghman Lesher <func_config__200803@the-tilghman.com>
*
* \ingroup functions
*/
/*** MODULEINFO
<support_level>core</support_level>
***/
#include "asterisk.h"
ASTERISK_FILE_VERSION(__FILE__, "$Revision: 421328 $")
#include "asterisk/module.h"
#include "asterisk/channel.h"
#include "asterisk/pbx.h"
#include "asterisk/app.h"
/*** DOCUMENTATION
<function name="AST_CONFIG" language="en_US">
<synopsis>
Retrieve a variable from a configuration file.
</synopsis>
<syntax>
<parameter name="config_file" required="true" />
<parameter name="category" required="true" />
<parameter name="variable_name" required="true" />
</syntax>
<description>
<para>This function reads a variable from an Asterisk configuration file.</para>
</description>
</function>
***/
struct config_item {
AST_RWLIST_ENTRY(config_item) entry;
struct ast_config *cfg;
char filename[0];
};
static AST_RWLIST_HEAD_STATIC(configs, config_item);
static int config_function_read(struct ast_channel *chan, const char *cmd, char *data,
char *buf, size_t len)
{
struct ast_config *cfg;
struct ast_flags cfg_flags = { CONFIG_FLAG_FILEUNCHANGED };
const char *val;
char *parse;
struct config_item *cur;
AST_DECLARE_APP_ARGS(args,
AST_APP_ARG(filename);
AST_APP_ARG(category);
AST_APP_ARG(variable);
AST_APP_ARG(index);
);
if (ast_strlen_zero(data)) {
ast_log(LOG_ERROR, "AST_CONFIG() requires an argument\n");
return -1;
}
parse = ast_strdupa(data);
AST_STANDARD_APP_ARGS(args, parse);
if (ast_strlen_zero(args.filename)) {
ast_log(LOG_ERROR, "AST_CONFIG() requires a filename\n");
return -1;
}
if (ast_strlen_zero(args.category)) {
ast_log(LOG_ERROR, "AST_CONFIG() requires a category\n");
return -1;
}
if (ast_strlen_zero(args.variable)) {
ast_log(LOG_ERROR, "AST_CONFIG() requires a variable\n");
return -1;
}
if (!(cfg = ast_config_load(args.filename, cfg_flags)) || cfg == CONFIG_STATUS_FILEINVALID) {
return -1;
}
if (cfg == CONFIG_STATUS_FILEUNCHANGED) {
/* Retrieve cfg from list */
AST_RWLIST_RDLOCK(&configs);
AST_RWLIST_TRAVERSE(&configs, cur, entry) {
if (!strcmp(cur->filename, args.filename)) {
break;
}
}
if (!cur) {
/* At worst, we might leak an entry while upgrading locks */
AST_RWLIST_UNLOCK(&configs);
AST_RWLIST_WRLOCK(&configs);
if (!(cur = ast_calloc(1, sizeof(*cur) + strlen(args.filename) + 1))) {
AST_RWLIST_UNLOCK(&configs);
return -1;
}
strcpy(cur->filename, args.filename);
ast_clear_flag(&cfg_flags, CONFIG_FLAG_FILEUNCHANGED);
if (!(cfg = ast_config_load(args.filename, cfg_flags)) || cfg == CONFIG_STATUS_FILEINVALID) {
ast_free(cur);
AST_RWLIST_UNLOCK(&configs);
return -1;
}
cur->cfg = cfg;
AST_RWLIST_INSERT_TAIL(&configs, cur, entry);
}
cfg = cur->cfg;
} else {
/* Replace cfg in list */
AST_RWLIST_WRLOCK(&configs);
AST_RWLIST_TRAVERSE(&configs, cur, entry) {
if (!strcmp(cur->filename, args.filename)) {
break;
}
}
if (!cur) {
if (!(cur = ast_calloc(1, sizeof(*cur) + strlen(args.filename) + 1))) {
AST_RWLIST_UNLOCK(&configs);
return -1;
}
strcpy(cur->filename, args.filename);
cur->cfg = cfg;
AST_RWLIST_INSERT_TAIL(&configs, cur, entry);
} else {
ast_config_destroy(cur->cfg);
cur->cfg = cfg;
}
}
if (!(val = ast_variable_retrieve(cfg, args.category, args.variable))) {
ast_debug(1, "'%s' not found in [%s] of '%s'\n", args.variable,
args.category, args.filename);
AST_RWLIST_UNLOCK(&configs);
return -1;
}
ast_copy_string(buf, val, len);
/* Unlock down here, so there's no chance the struct goes away while we're using it. */
AST_RWLIST_UNLOCK(&configs);
return 0;
}
static struct ast_custom_function config_function = {
.name = "AST_CONFIG",
.read = config_function_read,
};
static int unload_module(void)
{
struct config_item *current;
int res = ast_custom_function_unregister(&config_function);
AST_RWLIST_WRLOCK(&configs);
while ((current = AST_RWLIST_REMOVE_HEAD(&configs, entry))) {
ast_config_destroy(current->cfg);
ast_free(current);
}
AST_RWLIST_UNLOCK(&configs);
return res;
}
static int load_module(void)
{
return ast_custom_function_register(&config_function);
}
AST_MODULE_INFO_STANDARD(ASTERISK_GPL_KEY, "Asterisk configuration file variable access");
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