This new function, VERSION(), created via bug report 8176, may help dialplan programmers in the future. In the meantime, they can use the algorithm I outline on the bug report notes; If anyone invents something better, I'd hope they post it

git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@45724 65c4cc65-6c06-0410-ace0-fbb531ad65f3

funcs/func_version.c

@@ -0,0 +1,118 @@
+/*
+ * Asterisk -- An open source telephony toolkit.
+ *
+ * Copyright (C) 2006, Digium, Inc.
+ *
+ * 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 Return the current Version strings
+ * 
+ * \author Steve Murphy (murf@digium.com)
+ */
+
+#include "asterisk.h"
+
+ASTERISK_FILE_VERSION(__FILE__, "$Revision$")
+
+#include <stdlib.h>
+#include <string.h>
+#include <stdio.h>
+#include <sys/types.h>
+
+#include "asterisk/module.h"
+#include "asterisk/channel.h"
+#include "asterisk/pbx.h"
+#include "asterisk/logger.h"
+#include "asterisk/utils.h"
+#include "asterisk/app.h"
+#include "asterisk/options.h"
+#include "asterisk/version.h"
+#include "asterisk/build.h"
+
+#define STRING_IT(vernum) STRING_IT2(vernum)
+#define STRING_IT2(vernum) #vernum
+
+static int acf_version_exec(struct ast_channel *chan, char *cmd,
+			 char *parse, char *buffer, size_t buflen)
+{
+	struct ast_module_user *u;
+	char *response_char = ASTERISK_VERSION;
+	AST_DECLARE_APP_ARGS(args,
+			     AST_APP_ARG(info);
+	);
+
+	u = ast_module_user_add(chan);
+
+	AST_STANDARD_APP_ARGS(args, parse);
+
+	if (!ast_strlen_zero(args.info) ) {
+		if (strcasecmp(args.info,"ASTERISK_VERSION_NUM") == 0)
+			response_char = STRING_IT(ASTERISK_VERSION_NUM);
+		else if (strcasecmp(args.info,"BUILD_USER") == 0)
+			response_char = BUILD_USER;
+		else if (strcasecmp(args.info,"BUILD_HOSTNAME") == 0)
+			response_char = BUILD_HOSTNAME;
+		else if (strcasecmp(args.info,"BUILD_MACHINE") == 0)
+			response_char = BUILD_MACHINE;
+		else if (strcasecmp(args.info,"BUILD_KERNEL") == 0)
+			response_char = BUILD_KERNEL;
+		else if (strcasecmp(args.info,"BUILD_OS") == 0)
+			response_char = BUILD_OS;
+		else if (strcasecmp(args.info,"BUILD_DATE") == 0)
+			response_char = BUILD_DATE;
+
+	}
+
+
+	if (option_debug)
+		ast_log(LOG_DEBUG, "VERSION returns %s result, given %s argument\n",
+			response_char, args.info);
+	snprintf(buffer, buflen, "%s", response_char);
+
+	ast_module_user_remove(u);
+
+	return 0;
+}
+
+static struct ast_custom_function acf_version = {
+	.name = "VERSION",
+	.synopsis = "Return the Version info for this Asterisk",
+	.syntax = "VERSION([info])",
+	.desc =
+		"If there are no arguments, return the version of Asterisk in this format: SVN-branch-1.4-r44830M\n"
+		"If the argument is 'ASTERISK_VERSION_NUM', a string of digits is returned (right now fixed at 999999).\n"
+		"If the argument is 'BUILD_USER', the string representing the user's name whose account was used to configure Asterisk, is returned.\n"
+		"If the argument is 'BUILD_HOSTNAME', the string representing the name of the host on which Asterisk was configured, is returned.\n"
+		"If the argument is 'BUILD_MACHINE', the string representing the type of machine on which Asterisk was configured, is returned.\n"
+		"If the argument is 'BUILD_OS', the string representing the OS of the machine on which Asterisk was configured, is returned.\n"
+		"If the argument is 'BUILD_DATE', the string representing the date on which Asterisk was configured, is returned.\n"
+		"If the argument is 'BUILD_KERNEL', the string representing the kernel version of the machine on which Asterisk was configured, is returned .\n"
+		"  Example:  Set(junky=${VERSION()}; \n"
+		"  Sets junky to the string 'SVN-branch-1.6-r74830M', or possibly, 'SVN-trunk-r45126M'.\n",
+	.read = acf_version_exec,
+};
+
+static int unload_module(void)
+{
+	ast_custom_function_unregister(&acf_version);
+
+	return 0;
+}
+
+static int load_module(void)
+{
+	return ast_custom_function_register(&acf_version);
+}
+
+AST_MODULE_INFO_STANDARD(ASTERISK_GPL_KEY, "Get Asterisk Version/Build Info");