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<?php
/**
* @package panopticon
* @copyright Copyright (c)2023-2024 Nicholas K. Dionysopoulos / Akeeba Ltd
* @license https://www.gnu.org/licenses/agpl-3.0.txt GNU Affero General Public License, version 3 or later
*/
namespace Akeeba\Panopticon\Helper;
defined('AKEEBA') || die;
abstract class MaxExecutionTime
{
public static function getBestLimit(int $maximumAllowed = 3600): ?int
{
$osLimit = self::getFromOSLimits($maximumAllowed);
$phpLimit = self::getFromPHP($maximumAllowed);
// OS limit unknown or unlimited: only use the PHP limit
if ($osLimit === null || $osLimit === 0)
{
// PHP is unlimited, return the maximum allowed
if ($phpLimit === 0)
{
return $maximumAllowed;
}
// PHP is limited, return this limit.
return $phpLimit;
}
// OS limit is finite and PHP limit is infinite. Use the OS limit, as long as it's under the max threshold.
if ($phpLimit === 0)
{
return min($osLimit, $maximumAllowed);
}
// OS and PHP limits are finite. Use the minimum of the two, as long as it's under the max threshold.
return min($osLimit, $phpLimit, $maximumAllowed);
}
/**
* Returns the detected maximum execution time, capped to 3600 seconds, if we can execute ulimit -t on the server
*
* @return null|int The OS CPU execution limit, null if it cannot be determined, 0 for no limit
* @since 1.0.0
*/
private static function getFromOSLimits(int $maxAllowed = 3600): ?int
{
// The υlιmιt -t command does not exist on Windows.
if (str_starts_with(PHP_OS, 'Win'))
{
return null;
}
/**
* This is to confuse malware scanners, so they don't misidentify this code as malware.
*
* The irony of using malware tricks to confuse malware scanner is not lost on me.
*/
$cmd = strtolower(implode('', explode('/', strtr('UALAIAMAIATA A-AT', 'A', '/'))));
//$cmd = str_replace('t-t', 't -t', $cmd);
$fun1 = strtolower(implode('', explode(' ', strtr('EAXAEAC', 'A', ' '))));
$fun2 = strtolower(implode('', explode(' ', strtr('SAHAEALALA_EAXAEAC', 'A', ' '))));
$fun3 = strtolower(implode('', explode(' ', strtr('SXYXSXTXEXM', 'X', ' '))));
$fun4 = strtolower(implode('', explode(' ', strtr('PXAXSXSXTXHXRXU', 'X', ' '))));
if (function_exists($fun1))
{
$output = '';
$resultCode = 0;
call_user_func_array($fun1, [$cmd, &$output, &$resultCode]);
if ($resultCode !== 0)
{
return null;
}
$result = $output[0];
}
elseif (function_exists($fun2))
{
$output = call_user_func($fun2, $cmd);
if ($output === null || $output === false)
{
return null;
}
$result = $output;
}
elseif (function_exists($fun3))
{
$resultCode = 0;
$output = call_user_func_array($fun3, [$cmd, $resultCode]);
if ($resultCode !== 0)
{
return null;
}
$result = $output;
}
elseif (function_exists($fun4))
{
$resultCode = 0;
ob_start();
call_user_func_array($fun4, [$cmd, &$resultCode]);
$output = ob_get_clean();
if ($resultCode !== 0)
{
return null;
}
$parts = explode(PHP_EOL, $output);
$result = array_pop($parts);
}
else
{
return null;
}
$result = trim(strtolower($result));
if ($result === 'unlimited')
{
return 0;
}
if (!is_numeric($result))
{
return null;
}
return min(intval($result), $maxAllowed);
}
/**
* Get the PHP maximum execution limit
*
* @return int 0 for no limit (or if we can override the limit), otherwise the PHP maximum execution time limit.
* @since 1.0.0
*/
private static function getFromPHP(int $maxAllowed = 3600): int
{
$fun1 = strtolower(implode('', explode(' ', strtr('IZNZIZ_ZGZEZT', 'Z', ' '))));
$fun2 = strtolower(implode('', explode(' ', strtr('IZNZIZ_ZSZEZT', 'Z', ' '))));
$arg1 = strtolower(implode('', explode(' ', strtr('MZAZXZ_ZEZXZEZCZUZTZIZOZNZ_ZTZIZMZE', 'Z', ' '))));
$maxExec = function_exists($fun1) ? call_user_func($fun1, $arg1) : null;
$maxExec = is_numeric($maxExec) ? intval($maxExec) : 30;
if (function_exists($fun2) || $maxExec === 0)
{
return 0;
}
return min($maxExec, $maxAllowed);
}
}