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| 1 | <?php |
| 2 | namespace ExecWithFallback; |
| 3 | |
| 4 | /** |
| 5 | * Execute command with exec(), open_proc() or whatever available |
| 6 | * |
| 7 | * @package ExecWithFallback |
| 8 | * @author Bjørn Rosell <it@rosell.dk> |
| 9 | */ |
| 10 | class ExecWithFallback |
| 11 | { |
| 12 | |
| 13 | protected static $methods = ['exec', 'passthru', 'popen', 'proc_open', 'shell_exec']; |
| 14 | |
| 15 | /** |
| 16 | * Check if any of the methods are available on the system. |
| 17 | * |
| 18 | * @param boolean $needResultCode Whether the code using this library is going to supply $result_code to the exec |
| 19 | * call. This matters because shell_exec is only available when not. |
| 20 | */ |
| 21 | public static function anyAvailable($needResultCode = true) |
| 22 | { |
| 23 | return Availability::anyAvailable($needResultCode); |
| 24 | } |
| 25 | |
| 26 | /** |
| 27 | * Check if a function is enabled (function_exists as well as ini is tested) |
| 28 | * |
| 29 | * @param string $functionName The name of the function |
| 30 | * |
| 31 | * @return boolean If the function is enabled |
| 32 | */ |
| 33 | public static function functionEnabled($functionName) |
| 34 | { |
| 35 | if (!function_exists($functionName)) { |
| 36 | return false; |
| 37 | } |
| 38 | if (function_exists('ini_get')) { |
| 39 | if (ini_get('safe_mode')) { |
| 40 | return false; |
| 41 | } |
| 42 | $d = ini_get('disable_functions'); |
| 43 | if ($d === false) { |
| 44 | $d = ''; |
| 45 | } |
| 46 | $d2 = ini_get('suhosin.executor.func.blacklist'); |
| 47 | if ($d2 === false) { |
| 48 | $d2 = ''; |
| 49 | } |
| 50 | $d .= $d2 . ','; |
| 51 | |
| 52 | $d = preg_replace('/,\s*/', ',', $d); |
| 53 | if (strpos(',' . $d . ',', ',' . $functionName . ',') !== false) { |
| 54 | return false; |
| 55 | } |
| 56 | } |
| 57 | return is_callable($functionName); |
| 58 | } |
| 59 | |
| 60 | |
| 61 | /** |
| 62 | * Execute. - A substitute for exec() |
| 63 | * |
| 64 | * Same signature and results as exec(): https://www.php.net/manual/en/function.exec.php |
| 65 | * In case neither exec(), nor emulations are available, it throws an Exception. |
| 66 | * This is more gentle than real exec(), which on some systems throws a FATAL when exec() is disabled |
| 67 | * If you want the more acurate substitute, which might halt execution, use execNoMercy() instead. |
| 68 | * |
| 69 | * @param string $command The command to execute |
| 70 | * @param string &$output (optional) |
| 71 | * @param int &$result_code (optional) |
| 72 | * |
| 73 | * @return string | false The last line of output or false in case of failure |
| 74 | * @throws \Exception If no methods are available |
| 75 | */ |
| 76 | public static function exec($command, &$output = null, &$result_code = null) |
| 77 | { |
| 78 | foreach (self::$methods as $method) { |
| 79 | if (self::functionEnabled($method)) { |
| 80 | if (func_num_args() >= 3) { |
| 81 | if ($method == 'shell_exec') { |
| 82 | continue; |
| 83 | } |
| 84 | $result = self::runExec($method, $command, $output, $result_code); |
| 85 | } else { |
| 86 | $result = self::runExec($method, $command, $output); |
| 87 | } |
| 88 | if ($result !== false) { |
| 89 | return $result; |
| 90 | } |
| 91 | } |
| 92 | } |
| 93 | if (isset($result) && ($result === false)) { |
| 94 | return false; |
| 95 | } |
| 96 | throw new \Exception('exec() is not available'); |
| 97 | } |
| 98 | |
| 99 | /** |
| 100 | * Execute. - A substitute for exec(), with exact same errors thrown if exec() is missing. |
| 101 | * |
| 102 | * Danger: On some systems, this results in a fatal (non-catchable) error. |
| 103 | */ |
| 104 | public static function execNoMercy($command, &$output = null, &$result_code = null) |
| 105 | { |
| 106 | if (func_num_args() == 3) { |
| 107 | try { |
| 108 | return self::exec($command, $output, $result_code); |
| 109 | } catch (\Exception $e) { |
| 110 | // MIGHT THROW FATAL! |
| 111 | return exec($command, $output, $result_code); |
| 112 | } |
| 113 | } else { |
| 114 | try { |
| 115 | return self::exec($command, $output); |
| 116 | } catch (\Exception $e) { |
| 117 | // MIGHT THROW FATAL! |
| 118 | return exec($command, $output); |
| 119 | } |
| 120 | } |
| 121 | } |
| 122 | |
| 123 | public static function runExec($method, $command, &$output = null, &$result_code = null) |
| 124 | { |
| 125 | switch ($method) { |
| 126 | case 'exec': |
| 127 | return exec($command, $output, $result_code); |
| 128 | case 'passthru': |
| 129 | return Passthru::exec($command, $output, $result_code); |
| 130 | case 'popen': |
| 131 | return POpen::exec($command, $output, $result_code); |
| 132 | case 'proc_open': |
| 133 | return ProcOpen::exec($command, $output, $result_code); |
| 134 | case 'shell_exec': |
| 135 | if (func_num_args() == 4) { |
| 136 | return ShellExec::exec($command, $output, $result_code); |
| 137 | } else { |
| 138 | return ShellExec::exec($command, $output); |
| 139 | } |
| 140 | } |
| 141 | return false; |
| 142 | } |
| 143 | } |