93 lines
2.4 KiB
C
93 lines
2.4 KiB
C
/*
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* Asterisk -- An open source telephony toolkit.
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*
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* Copyright (C) 2006, Digium, Inc.
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*
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* See http://www.asterisk.org for more information about
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* the Asterisk project. Please do not directly contact
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* any of the maintainers of this project for assistance;
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* the project provides a web site, mailing lists and IRC
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* channels for your use.
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*
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* This program is free software, distributed under the terms of
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* the GNU General Public License Version 2. See the LICENSE file
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* at the top of the source tree.
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*/
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/*! \file
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*
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* \SHELL function to return the value of a system call.
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*
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* \note Inspiration and Guidance from Russell! Thank You!
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*
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* \author Brandon Kruse <bkruse@digium.com>
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*
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* \ingroup functions
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*/
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#include "asterisk.h"
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ASTERISK_FILE_VERSION(__FILE__, "$Revision$")
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/types.h>
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#include "asterisk/module.h"
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#include "asterisk/channel.h"
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#include "asterisk/pbx.h"
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#include "asterisk/logger.h"
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#include "asterisk/utils.h"
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#include "asterisk/app.h"
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static int shell_helper(struct ast_channel *chan, const char *cmd, char *data,
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char *buf, size_t len)
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{
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if (ast_strlen_zero(data)) {
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ast_log(LOG_WARNING, "Missing Argument! Example: Set(foo=${SHELL(echo \"bar\")})\n");
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return -1;
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}
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if (len >= 1) {
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FILE *ptr;
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char plbuff[4096];
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ptr = popen(data, "r");
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while (fgets(plbuff, sizeof(plbuff), ptr)) {
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strncat(buf, plbuff, len - strlen(buf) - 1);
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}
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pclose(ptr);
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}
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return 0;
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}
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static struct ast_custom_function shell_function = {
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.name = "SHELL",
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.synopsis = "Executes a command as if you were at a shell.",
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.syntax = "SHELL(<command>)",
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.read = shell_helper,
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.desc =
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"Returns the value from a system command\n"
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" Example: Set(foo=${SHELL(echo \"bar\")})\n"
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" Note: When using the SHELL() dialplan function, your \"SHELL\" is /bin/sh,\n"
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" which may differ as to the underlying shell, depending upon your production\n"
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" platform. Also keep in mind that if you are using a common path, you should\n"
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" be mindful of race conditions that could result from two calls running\n"
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" SHELL() simultaneously.\n",
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};
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static int unload_module(void)
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{
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return ast_custom_function_unregister(&shell_function);
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}
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static int load_module(void)
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{
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return ast_custom_function_register(&shell_function);
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}
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AST_MODULE_INFO_STANDARD(ASTERISK_GPL_KEY, "SHELL dialplan function");
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