mirror of
https://github.com/asterisk/asterisk.git
synced 2025-11-03 20:38:59 +00:00
e12184cf95
https://origsvn.digium.com/svn/asterisk/branches/10 ................ r331576 | rmudgett | 2011-08-11 16:42:21 -0500 (Thu, 11 Aug 2011) | 16 lines Merged revisions 331575 via svnmerge from https://origsvn.digium.com/svn/asterisk/branches/1.8 ........ r331575 | rmudgett | 2011-08-11 16:39:58 -0500 (Thu, 11 Aug 2011) | 9 lines Segfault in shell_helper in func_shell.c. The return value of popen() was not checked for failure to open. (closes issue ASTERISK-18109) JIRA SWP-3633 Reported by: Michael Myles Tested by: rmudgett ........ ................ git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@331577 65c4cc65-6c06-0410-ace0-fbb531ad65f3
118 lines
2.9 KiB
C
118 lines
2.9 KiB
C
/*
|
|
* 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
|
|
*
|
|
* SHELL function to return the value of a system call.
|
|
*
|
|
* \note Inspiration and Guidance from Russell! Thank You!
|
|
*
|
|
* \author Brandon Kruse <bkruse@digium.com>
|
|
*
|
|
* \ingroup functions
|
|
*/
|
|
|
|
/*** MODULEINFO
|
|
<support_level>core</support_level>
|
|
***/
|
|
|
|
#include "asterisk.h"
|
|
|
|
ASTERISK_FILE_VERSION(__FILE__, "$Revision$")
|
|
|
|
#include "asterisk/module.h"
|
|
#include "asterisk/channel.h"
|
|
#include "asterisk/pbx.h"
|
|
#include "asterisk/utils.h"
|
|
#include "asterisk/app.h"
|
|
|
|
static int shell_helper(struct ast_channel *chan, const char *cmd, char *data,
|
|
char *buf, size_t len)
|
|
{
|
|
int res = 0;
|
|
|
|
if (ast_strlen_zero(data)) {
|
|
ast_log(LOG_WARNING, "Missing Argument! Example: Set(foo=${SHELL(echo \"bar\")})\n");
|
|
return -1;
|
|
}
|
|
|
|
if (chan) {
|
|
ast_autoservice_start(chan);
|
|
}
|
|
|
|
if (len >= 1) {
|
|
FILE *ptr;
|
|
char plbuff[4096];
|
|
|
|
ptr = popen(data, "r");
|
|
if (ptr) {
|
|
while (fgets(plbuff, sizeof(plbuff), ptr)) {
|
|
strncat(buf, plbuff, len - strlen(buf) - 1);
|
|
}
|
|
pclose(ptr);
|
|
} else {
|
|
ast_log(LOG_WARNING, "Failed to execute shell command '%s'\n", data);
|
|
res = -1;
|
|
}
|
|
}
|
|
|
|
if (chan) {
|
|
ast_autoservice_stop(chan);
|
|
}
|
|
|
|
return res;
|
|
}
|
|
|
|
/*** DOCUMENTATION
|
|
<function name="SHELL" language="en_US">
|
|
<synopsis>
|
|
Executes a command as if you were at a shell.
|
|
</synopsis>
|
|
<syntax>
|
|
<parameter name="command" required="true">
|
|
<para>This is the argument to the function, the command you want to pass to the shell.</para>
|
|
</parameter>
|
|
</syntax>
|
|
<description>
|
|
<para>Returns the value from a system command</para>
|
|
<para>Example: <literal>Set(foo=${SHELL(echo \bar\)})</literal></para>
|
|
<note><para>When using the SHELL() dialplan function, your \SHELL\ is /bin/sh,
|
|
which may differ as to the underlying shell, depending upon your production
|
|
platform. Also keep in mind that if you are using a common path, you should
|
|
be mindful of race conditions that could result from two calls running
|
|
SHELL() simultaneously.</para></note>
|
|
</description>
|
|
|
|
</function>
|
|
***/
|
|
static struct ast_custom_function shell_function = {
|
|
.name = "SHELL",
|
|
.read = shell_helper,
|
|
};
|
|
|
|
static int unload_module(void)
|
|
{
|
|
return ast_custom_function_unregister(&shell_function);
|
|
}
|
|
|
|
static int load_module(void)
|
|
{
|
|
return ast_custom_function_register(&shell_function);
|
|
}
|
|
|
|
AST_MODULE_INFO_STANDARD(ASTERISK_GPL_KEY, "Returns the output of a shell command");
|
|
|