jedchecker/source/administrator/components/com_jedchecker/libraries/rules/jexec.php

<?php
/**
 * @author     eaxs
 * @date       07/06/2012
 * @copyright  Copyright (C) 2008 - 2012 compojoom.com . All rights reserved.
 * @license    GNU General Public License version 2 or later; see LICENSE
 */

defined('_JEXEC') or die('Restricted access');


// Include the rule base class
require_once(JPATH_COMPONENT_ADMINISTRATOR.'/models/rule.php');


/**
 * This class searches all files for the _JEXEC check
 * which prevents direct file access.
 *
 */
class jedcheckerRulesJexec extends JEDcheckerRule
{
    /**
     * The formal ID of this rule. For example: SE1.
     *
     * @var    string
     */
    protected $id = 'PH2';

    /**
     * The title or caption of this rule.
     *
     * @var    string
     */
    protected $title = 'COM_JEDCHECKER_RULE_PH2';

    /**
     * The description of this rule.
     *
     * @var    string
     */
    protected $description = 'COM_JEDCHECKER_RULE_PH2_DESC';


    /**
     * Initiates the file search and check
     *
     * @return    void
     */
    public function check()
    {
        // Find all php files of the extension
        $files = JFolder::files($this->basedir, '.php$', true, true);

        // Iterate through all files
        foreach($files as $file)
        {
            // Try to find the _JEXEC check in the file
            if(!$this->find($file)) {
                // Add as error to the report if it was not found
                $this->report->addError($file, 'COM_JEDCHECKER_ERROR_JEXEC_NOT_FOUND');
            }
        }
    }


    /**
     * Reads a file and searches for the _JEXEC statement
     *
     * @param     string    $file    The path to the file
     * @return    boolean            True if the statement was found, otherwise False.
     */
    protected function find($file)
    {
        $content = (array) file($file);

        // Get the constants to look for
        $defines = $this->params->get('constants');
        $defines = explode(',', $defines);

        foreach ($content AS $line)
        {
            // Search for "defined"
            $pos_1 = stripos($line, 'defined');

            // Skip the line if "defined" is not found
            if ($pos_1 === false) {
                continue;
            }

            // Search for "die".
            //  "or" may not be present depending on syntax
            $pos_3 = stripos($line, 'die');
            // Skip the line if "die" is not found
            if ($pos_3 === false) {
                continue;
            }

            // Search for the constant name
            foreach ($defines AS $define)
            {
                $define = trim($define);

                // Search for the define
                $pos_2 = strpos($line, $define);
                // Skip the line if the define is not found
                if($pos_2 === false) continue;

                // Check the position of the words
                if($pos_2 > $pos_1 && $pos_3 > $pos_2) {
                    unset($content);
                    return true;
                }
            }
        }

        unset($content);

        return false;
    }
}