Add a trivial new dialplan function, AST_CONFIG(), which allows you to access

a variable from an Asterisk configuration file in the dialplan, or anywhere
else where dialplan functions can be used.

(Inspired by a discussion with Tilghman and Pari)


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@107787 65c4cc65-6c06-0410-ace0-fbb531ad65f3

CHANGES

@@ -2,7 +2,10 @@
 --- Functionality changes from Asterisk 1.6.0 to Asterisk 1.6.1  -------------
 ------------------------------------------------------------------------------
 
-
+Dialplan Functions
+------------------
+ * Added a new dialplan function, AST_CONFIG(), which allows you to access
+   variables from an Asterisk configuration file.
 
 ------------------------------------------------------------------------------
 --- Functionality changes from Asterisk 1.4.X to Asterisk 1.6.0  -------------

funcs/func_config.c

@@ -0,0 +1,116 @@
+/*
+ * Asterisk -- An open source telephony toolkit.
+ *
+ * Copyright (C) 2008, Digium, Inc.
+ *
+ * Russell Bryant <russell@digium.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>
+ * 
+ * \ingroup functions
+ */
+
+#include "asterisk.h"
+
+ASTERISK_FILE_VERSION(__FILE__, "$Revision$")
+
+#include "asterisk/module.h"
+#include "asterisk/channel.h"
+#include "asterisk/pbx.h"
+#include "asterisk/app.h"
+
+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 = { 0 };
+	const char *val;
+	char *parse;
+	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))) {
+		return -1;
+	}
+
+	if (!(val = ast_variable_retrieve(cfg, args.category, args.variable))) {
+		ast_log(LOG_ERROR, "'%s' not found in [%s] of '%s'\n", args.variable, 
+			args.category, args.filename);
+		return -1;
+	}
+
+	ast_copy_string(buf, val, len);
+
+	ast_config_destroy(cfg);
+
+	return 0;
+}
+
+static struct ast_custom_function config_function = {
+	.name = "AST_CONFIG",
+	.syntax = "AST_CONFIG(config_file,category,variable_name[,index])",
+	.synopsis = "Retrieve a variable from a configuration file",
+	.desc = 
+	"   This function reads a variable from an Asterisk configuration file.\n"
+	"The optional index parameter would be used in the case that a variable\n"
+	"exists more than once in a category.  The index is zero-based, so an\n"
+	"index of 0 returns the first instance of the variable.  Also, if the\n"
+	"word \"count\" in the index field, the number of instances of that\n"
+	"variable will be returned.\n"
+	"",
+	.read = config_function_read,
+};
+
+static int unload_module(void)
+{
+	return ast_custom_function_unregister(&config_function);
+}
+
+static int load_module(void)
+{
+	return ast_custom_function_register(&config_function);
+}
+
+AST_MODULE_INFO_STANDARD(ASTERISK_GPL_KEY, "Asterisk configuration file variable access");