00001
00002
00003
00004
00005
00006
00007
00008
00009
00010
00011
00012
00013
00014
00015
00016
00017
00018
00019
00020
00021
00022
00023
00024
00025
00026
00027
00028 #include "asterisk.h"
00029
00030 ASTERISK_FILE_VERSION(__FILE__, "$Revision: 89425 $")
00031
00032 #include "asterisk/module.h"
00033 #include "asterisk/channel.h"
00034 #include "asterisk/pbx.h"
00035 #include "asterisk/utils.h"
00036 #include "asterisk/app.h"
00037
00038 static int shell_helper(struct ast_channel *chan, const char *cmd, char *data,
00039 char *buf, size_t len)
00040 {
00041 if (ast_strlen_zero(data)) {
00042 ast_log(LOG_WARNING, "Missing Argument! Example: Set(foo=${SHELL(echo \"bar\")})\n");
00043 return -1;
00044 }
00045
00046 if (chan)
00047 ast_autoservice_start(chan);
00048
00049 if (len >= 1) {
00050 FILE *ptr;
00051 char plbuff[4096];
00052
00053 ptr = popen(data, "r");
00054 while (fgets(plbuff, sizeof(plbuff), ptr)) {
00055 strncat(buf, plbuff, len - strlen(buf) - 1);
00056 }
00057 pclose(ptr);
00058 }
00059
00060 if (chan)
00061 ast_autoservice_stop(chan);
00062
00063 return 0;
00064 }
00065
00066 static struct ast_custom_function shell_function = {
00067 .name = "SHELL",
00068 .synopsis = "Executes a command as if you were at a shell.",
00069 .syntax = "SHELL(<command>)",
00070 .read = shell_helper,
00071 .desc =
00072 "Returns the value from a system command\n"
00073 " Example: Set(foo=${SHELL(echo \"bar\")})\n"
00074 " Note: When using the SHELL() dialplan function, your \"SHELL\" is /bin/sh,\n"
00075 " which may differ as to the underlying shell, depending upon your production\n"
00076 " platform. Also keep in mind that if you are using a common path, you should\n"
00077 " be mindful of race conditions that could result from two calls running\n"
00078 " SHELL() simultaneously.\n",
00079 };
00080
00081 static int unload_module(void)
00082 {
00083 return ast_custom_function_unregister(&shell_function);
00084 }
00085
00086 static int load_module(void)
00087 {
00088 return ast_custom_function_register(&shell_function);
00089 }
00090
00091 AST_MODULE_INFO_STANDARD(ASTERISK_GPL_KEY, "Returns the output of a shell command");
00092