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/*
* Asterisk -- A telephony toolkit for Linux.
*
* Execute arbitrary system commands
*
* Copyright (C) 1999 - 2005, Digium, Inc.
*
* Mark Spencer <markster@digium.com>
*
* This program is free software, distributed under the terms of
* the GNU General Public License
*/
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <stdlib.h>
#include <errno.h>
#include "asterisk.h"
ASTERISK_FILE_VERSION(__FILE__, "$Revision$")
#include "asterisk/lock.h"
#include "asterisk/file.h"
#include "asterisk/logger.h"
#include "asterisk/channel.h"
#include "asterisk/pbx.h"
#include "asterisk/module.h"
#include "asterisk/app.h"
#include "asterisk/options.h"
static char *tdesc = "Generic System() application";
static char *app = "System";
static char *app2 = "TrySystem";
static char *synopsis = "Execute a system command";
static char *synopsis2 = "Try executing a system command";
static char *chanvar = "SYSTEMSTATUS";
static char *descrip =
" System(command): Executes a command by using system(). Returns -1 on\n"
"failure to execute the specified command. \n"
"Result of execution is returned in the SYSTEMSTATUS channel variable:\n"
" FAILURE Could not execute the specified command\n"
" SUCCESS Specified command successfully executed\n"
"\n"
"Old behaviour:\n"
"If the command itself executes but is in error, and if there exists\n"
"a priority n + 101, where 'n' is the priority of the current instance,\n"
"then the channel will be setup to continue at that priority level.\n"
" Otherwise, System returns 0.\n";
static char *descrip2 =
" TrySystem(command): Executes a command by using system(). Returns 0\n"
"on any situation.\n"
"Result of execution is returned in the SYSTEMSTATUS channel variable:\n"
" FAILURE Could not execute the specified command\n"
" SUCCESS Specified command successfully executed\n"
" APPERROR Specified command successfully executed, but returned error code\n"
"\n"
"Old behaviour:\nIf the command itself executes but is in error, and if\n"
"there exists a priority n + 101, where 'n' is the priority of the current\n"
"instance, then the channel will be setup to continue at that\n"
"priority level. Otherwise, System returns 0.\n";
STANDARD_LOCAL_USER;
LOCAL_USER_DECL;
static int system_exec_helper(struct ast_channel *chan, void *data, int failmode)
{
int res=0;
struct localuser *u;
if (!data) {
ast_log(LOG_WARNING, "System requires an argument(command)\n");
pbx_builtin_setvar_helper(chan, chanvar, "FAILURE");
return failmode;
}
LOCAL_USER_ADD(u);
/* Do our thing here */
res = ast_safe_system((char *)data);
if ((res < 0) && (errno != ECHILD)) {
ast_log(LOG_WARNING, "Unable to execute '%s'\n", (char *)data);
pbx_builtin_setvar_helper(chan, chanvar, "FAILURE");
res = failmode;
} else if (res == 127) {
ast_log(LOG_WARNING, "Unable to execute '%s'\n", (char *)data);
pbx_builtin_setvar_helper(chan, chanvar, "FAILURE");
res = failmode;
} else {
if (res < 0)
res = 0;
if (option_priority_jumping && res)
ast_goto_if_exists(chan, chan->context, chan->exten, chan->priority + 101);
if (res != 0)
pbx_builtin_setvar_helper(chan, chanvar, "APPERROR");
else
pbx_builtin_setvar_helper(chan, chanvar, "SUCCESS");
res = 0;
}
LOCAL_USER_REMOVE(u);
return res;
}
static int system_exec(struct ast_channel *chan, void *data)
{
return system_exec_helper(chan, data, -1);
}
static int trysystem_exec(struct ast_channel *chan, void *data)
{
return system_exec_helper(chan, data, 0);
}
int unload_module(void)
{
STANDARD_HANGUP_LOCALUSERS;
ast_unregister_application(app2);
return ast_unregister_application(app);
}
int load_module(void)
{
ast_register_application(app2, trysystem_exec, synopsis2, descrip2);
return ast_register_application(app, system_exec, synopsis, descrip);
}
char *description(void)
{
return tdesc;
}
int usecount(void)
{
int res;
STANDARD_USECOUNT(res);
return res;
}
char *key()
{
return ASTERISK_GPL_KEY;
}
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