File "qtrScanLock.php"
Full Path: /home/rrterraplen/public_html/wp-includes/wp-includes/wp-content/plugins/quttera-web-malware-scanner/qtrScanLock.php
File size: 3.84 KB
MIME-type: text/x-php
Charset: utf-8
<?php
/**
* @file qtrScanLock.php
* @brief This module contains implelemtation of a scan lock to prevent concurrent execution of multiple scanners
*
* @author Quttera (qtr), [email protected]
*
* @internal
* Created 01/20/2016
* Compiler gcc/g++
* Company Quttera
* Copyright Copyright (c) 2016, Quttera
*
* This source code is released for free distribution under the terms of the
* GNU General Public License as published by the Free Software Foundation.
* =====================================================================================
*/
class CQtrScanLock
{
public static function Acquire()
{
if( self::IsLocked() == TRUE ){
/*
* Lock already taken
*/
return FALSE;
}
return self::Lock();
}
public static function TryAcquire()
{
return self::Acquire();
}
public static function IsLocked()
{
if(!is_file( self::LockName() )){
/*
* lock file is missing
*/
return FALSE;
}
$handle = @fopen(self::LockName(),"r");
if( !$handle ){
/*
* Failed to open lock
*/
return FALSE;
}
$contents = fread($handle, filesize(self::LockName()));
fclose($handle);
$pid = intval($contents);
if( $pid == getmypid() ){
/*
* this PID locked the scan
*/
return TRUE;
}
/*
* if process running posix_kill return true otherwise false
*/
/*
$rc = posix_kill($pid,0);
if( !$rc ){
# process locked scan is not running anymore
# remove lock file from system
self::Release();
}*/
$rc = self::_IsProcessRunning($pid);
if( !$rc ){
self::Release();
}
return $rc;
}
public static function Lock()
{
$lock = @fopen(self::LockName(),"w");
if( !$lock ){
/*
* Failed to open lock
*/
return FALSE;
}
@fwrite($lock,sprintf("%d",getmypid()));
@fflush($lock);
@fclose($lock);
return self::IsLocked();
}
public static function Release()
{
@unlink( self::LockName() );
return TRUE;
}
public static function LockName()
{
$tmp_path = NULL;
if( function_exists("get_temp_dir") ){
/*
* WordPress internal implementation
*/
$tmp_path = get_temp_dir();
}else{
$tmp_path = @sys_get_temp_dir();
}
$site_name = self::_GetCurrentSite();
$lock_file_name = "__QTR_LOCK__" . $site_name;
return $tmp_path . DIRECTORY_SEPARATOR . $lock_file_name;
}
public static function ForceUnlock(){
return self::Release();
}
protected static function _GetCurrentSite()
{
if(!function_exists('get_site_url') ){
/*
* running outside of WP
*/
return "localhost";
}
$site = get_site_url();
$site = str_replace(":","",$site);
$site = str_replace("/","",$site);
return $site;
}
protected static function _IsProcessRunning( $pid )
{
/*
* if process running posix_kill return true otherwise false
*/
$isRunning = false;
if(strncasecmp(PHP_OS, "win", 3) == 0)
{
$out = array();
exec("TASKLIST /FO LIST /FI \"PID eq $pid\"", $out);
if(count($out) > 1) {
$isRunning = true;
}
}
elseif(posix_kill($pid, 0))
{
$isRunning = true;
}
return $isRunning;
}
}
?>