From 5e1879682b032f7bc1a0d6f4fca556ca7909bc52 Mon Sep 17 00:00:00 2001
From: "Namhyeon, Go" <gnh1201@gmail.com>
Date: Sun, 22 Jul 2018 23:36:44 +0900
Subject: [PATCH] Update exectool.php

---
 helper/exectool.php | 300 ++++++++++++++++++++++----------------------
 1 file changed, 152 insertions(+), 148 deletions(-)

diff --git a/helper/exectool.php b/helper/exectool.php
index 66a9773..8898aa5 100644
--- a/helper/exectool.php
+++ b/helper/exectool.php
@@ -7,163 +7,167 @@
  */
 
 /*
-exec_test() executes a command (like "whoami") with different
-PHP functions in order to figure out which fuctions are supported 
-in the webserver configuration. The function execTests returns an array, which 
-contains names of all successful tested PHP functions.
-*/
-function exec_test() {
-    $cmd = "whoami";
-    $cmdPath = "/usr/bin/whoami";
-    $return = "";
-    $output = "";
-    $methodArray = array();
+ * exec_test() executes a command (like "whoami") with different
+ * PHP functions in order to figure out which fuctions are supported 
+ * in the webserver configuration. The function execTests returns an array, which 
+ * contains names of all successful tested PHP functions.
+ */
+if(!function_exists("exec_test")) {
+    function exec_test() {
+        $cmd = "whoami";
+        $cmdPath = "/usr/bin/whoami";
+        $return = "";
+        $output = "";
+        $methodArray = array();
 
-    // Testing system()
-    $return = ""; $output = "";
-    ob_start();
-    $output = system("$cmd 2>&1", $return);
-    ob_end_clean();
-    if (strlen($output) > 0 && $return == 0) {       
-        $methodArray[] = "system";
-    } 
+        // Testing system()
+        $return = ""; $output = "";
+        ob_start();
+        $output = system("$cmd 2>&1", $return);
+        ob_end_clean();
+        if (strlen($output) > 0 && $return == 0) {       
+            $methodArray[] = "system";
+        } 
 
-    // Testing exec()
-    $return = ""; $output = "";
-    exec($cmd, $output, $return);        
-    if (strlen($output[0]) > 0 && $return == 0) {
-        $methodArray[] = "exec";
+        // Testing exec()
+        $return = ""; $output = "";
+        exec($cmd, $output, $return);        
+        if (strlen($output[0]) > 0 && $return == 0) {
+            $methodArray[] = "exec";
+        }
+
+        // Testing shell_exec()
+        $return = ""; $output = "";
+        $output = shell_exec($cmd);
+        if (strlen($output) > 0) {       
+            $methodArray[] = "shell_exec";
+        }
+
+        // Testing backticks
+        $return = ""; $output = "";
+        $output = `$cmd`;        
+        if (strlen($output) > 0) {       
+            $methodArray[] = "backticks";
+        }
+
+        // Testing passthru()  
+        $return = ""; $output = "";
+        ob_start();
+        passthru($cmd, $return);
+        $output = ob_get_contents();
+        ob_end_clean();
+        if (strlen($output[0]) > 0 && $return == 0) {
+            $methodArray[] = "passthru";
+        }        
+
+        // Testing popen()
+        $return = ""; $output = "";
+        $handle = popen($cmdPath, "r");
+        $output = fread($handle, 2096);
+        pclose($handle);
+        if (strlen($output) > 0) {       
+            $methodArray[] = "popen";
+        }
+
+        // Testing proc_open()
+        $return = ""; $output = "";
+        $descriptorspec = array(
+           0 => array("pipe", "r"),  // stdin is a pipe that the child will read from
+           1 => array("pipe", "w"),  // stdout is a pipe that the child will write to
+           2 => array("file", "/tmp/error-output.txt", "a") // stderr is a file to write to
+        );  
+        $cwd = '/tmp';
+        $env = array('some_option' => 'aeiou');    
+        $process = proc_open($cmd, $descriptorspec, $pipes, $cwd, $env);
+        if (is_resource($process)) {
+            // $pipes now looks like this:
+            // 0 => writeable handle connected to child stdin
+            // 1 => readable handle connected to child stdout
+            // Any error output will be appended to /tmp/error-output.txt
+            $output = stream_get_contents($pipes[1]);
+            fclose($pipes[1]);
+
+            // It is important that you close any pipes before calling
+            // proc_close in order to avoid a deadlock
+            $return = proc_close($process);
+        }
+        if (strlen($output) > 0 && $return == 0) {       
+            $methodArray[] = "proc_open";
+        }
+
+        return $methodArray;
     }
-
-    // Testing shell_exec()
-    $return = ""; $output = "";
-    $output = shell_exec($cmd);
-    if (strlen($output) > 0) {       
-        $methodArray[] = "shell_exec";
-    }
-
-    // Testing backticks
-    $return = ""; $output = "";
-    $output = `$cmd`;        
-    if (strlen($output) > 0) {       
-        $methodArray[] = "backticks";
-    }
-
-    // Testing passthru()  
-    $return = ""; $output = "";
-    ob_start();
-    passthru($cmd, $return);
-    $output = ob_get_contents();
-    ob_end_clean();
-    if (strlen($output[0]) > 0 && $return == 0) {
-        $methodArray[] = "passthru";
-    }        
-
-    // Testing popen()
-    $return = ""; $output = "";
-    $handle = popen($cmdPath, "r");
-    $output = fread($handle, 2096);
-    pclose($handle);
-    if (strlen($output) > 0) {       
-        $methodArray[] = "popen";
-    }
-
-    // Testing proc_open()
-    $return = ""; $output = "";
-    $descriptorspec = array(
-       0 => array("pipe", "r"),  // stdin is a pipe that the child will read from
-       1 => array("pipe", "w"),  // stdout is a pipe that the child will write to
-       2 => array("file", "/tmp/error-output.txt", "a") // stderr is a file to write to
-    );  
-    $cwd = '/tmp';
-    $env = array('some_option' => 'aeiou');    
-    $process = proc_open($cmd, $descriptorspec, $pipes, $cwd, $env);
-    if (is_resource($process)) {
-        // $pipes now looks like this:
-        // 0 => writeable handle connected to child stdin
-        // 1 => readable handle connected to child stdout
-        // Any error output will be appended to /tmp/error-output.txt
-        $output = stream_get_contents($pipes[1]);
-        fclose($pipes[1]);
-
-        // It is important that you close any pipes before calling
-        // proc_close in order to avoid a deadlock
-        $return = proc_close($process);
-    }
-    if (strlen($output) > 0 && $return == 0) {       
-        $methodArray[] = "proc_open";
-    }
-
-    return $methodArray;
 }
 
 /*
-exec_command() executes a command (like "whoami") with the submited method    
-*/
-function exec_command($command, $method) {        
-    if ($method == "") {
+ * exec_command() executes a command (like "whoami") with the submited method    
+ */
+if(!function_exists("exec_command")) {
+    function exec_command($command, $method) {        
+        if ($method == "") {
 
-        // ob_start() will turn on output buffering to collect all output from
-        // exec_test() and ob_end_clean() will clean the buffer afterwards ("garbage collection") 
-        ob_start();
-        $methodArray = exec_test();
-        ob_end_clean();
+            // ob_start() will turn on output buffering to collect all output from
+            // exec_test() and ob_end_clean() will clean the buffer afterwards ("garbage collection") 
+            ob_start();
+            $methodArray = exec_test();
+            ob_end_clean();
 
-        if (is_array($methodArray)) {
-            $method = $methodArray[0];            
-        }
-        else {
-            echo "[!] No method availabe";
-            exit;
-        }            
-    }
-
-    switch ($method) {   
-        case "system":
-            system("$command 2>&1");
-            break;
-
-        case "exec":
-            exec($command, $output);
-            var_dump($output);  
-            break;
-
-        case "shell_exec":
-            echo shell_exec($command);
-            break;
-
-        case "backticks":
-            echo `$command`;
-            break;
-
-        case "passthru":
-            echo passthru($command);
-            break;
-
-        case "popen":
-            $handle = popen($command, "r");
-            echo fread($handle, 2096);
-            pclose($handle);
-            break;
-
-        case "proc_open":
-            $descriptorspec = array(
-               0 => array("pipe", "r"),  
-               1 => array("pipe", "w"),  
-               2 => array("file", "/tmp/error-output.txt", "a")
-            );  
-            $cwd = '/tmp';
-            $env = array('some_option' => 'aeiou');    
-            $process = proc_open($command, $descriptorspec, $pipes, $cwd, $env);
-            if (is_resource($process)) {           
-                echo stream_get_contents($pipes[1]);
-                fclose($pipes[1]);
-                proc_close($process);
+            if (is_array($methodArray)) {
+                $method = $methodArray[0];            
             }
-            break;
+            else {
+                echo "[!] No method availabe";
+                exit;
+            }            
+        }
 
-        default: 
-            echo "[!] No method defined";
-            break;
+        switch ($method) {   
+            case "system":
+                system("$command 2>&1");
+                break;
+
+            case "exec":
+                exec($command, $output);
+                var_dump($output);  
+                break;
+
+            case "shell_exec":
+                echo shell_exec($command);
+                break;
+
+            case "backticks":
+                echo `$command`;
+                break;
+
+            case "passthru":
+                echo passthru($command);
+                break;
+
+            case "popen":
+                $handle = popen($command, "r");
+                echo fread($handle, 2096);
+                pclose($handle);
+                break;
+
+            case "proc_open":
+                $descriptorspec = array(
+                   0 => array("pipe", "r"),  
+                   1 => array("pipe", "w"),  
+                   2 => array("file", "/tmp/error-output.txt", "a")
+                );  
+                $cwd = '/tmp';
+                $env = array('some_option' => 'aeiou');    
+                $process = proc_open($command, $descriptorspec, $pipes, $cwd, $env);
+                if (is_resource($process)) {           
+                    echo stream_get_contents($pipes[1]);
+                    fclose($pipes[1]);
+                    proc_close($process);
+                }
+                break;
+
+            default: 
+                echo "[!] No method defined";
+                break;
+        }
     }
 }