class.ilVirusScanner.php

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<?php
/* Copyright (c) 1998-2009 ILIAS open source, Extended GPL, see docs/LICENSE */
 
class ilVirusScanner
{
        var $type;
 
        var $scanZipFiles;
 
        var $scanCommand;
 
        var $cleanCommand;
 
        var $scanFilePath;
 
        var $scanFileOrigName;
 
        var $cleanFilePath;
 
        var $cleanFileOrigName;
 
        var $scanFileIsInfected;
 
        var $cleanFileIsCleaned;
 
        var $scanResult;
 
        var $cleanResult;
 
        var $ilias;
 
        var $lng;
 
        var $log;
 
        public function __construct($a_scancommand, $a_cleancommand)
        {
                global $ilias, $lng, $log;
 
                $this->ilias        = $ilias;
                $this->lng          = $lng;
                $this->log          = $log;
                $this->scanCommand  = $a_scancommand;
                $this->cleanCommand = $a_cleancommand;
 
                $this->type         = "simulate";
                $this->scanZipFiles = false;
        }
        
        public function scanBuffer($buffer)
        {
                return $this->scanFileFromBuffer($buffer);
        }
        
        protected function scanFileFromBuffer($buffer)
        {
                $bufferFile = $this->createBufferFile($buffer);
                $isInfected = $this->scanFile($bufferFile);
                $this->removeBufferFile($bufferFile);
                return $isInfected;
        }
        
        protected function createBufferFile($buffer)
        {
                $bufferFile = ilUtil::ilTempnam();
                file_put_contents($bufferFile, $buffer);
                return $bufferFile;
        }
        
        protected function removeBufferFile($bufferFile)
        {
                unlink($bufferFile);
        }
        
        function scanFile($a_filepath, $a_origname = "")
        {
                // This function needs to be redefined in child classes.
                // It should:
                // - call the external scanner for a_filepath
                // - set scanFilePath to a_filepath
                // - set scanFileOrigName to a_origname
                // - set scanFileIsInfected according the scan result
                // - set scanResult to the scanner output message
                // - call logScanResult() if file is infected
                // - return the output message, if file is infected
                // - return an empty string, if file is not infected
 
                $this->scanFilePath     = $a_filepath;
                $this->scanFileOrigName = $a_origname;
 
                if($a_origname == "infected.txt" or $a_origname == "cleanable.txt")
                {
                        $this->scanFileIsInfected = true;
                        $this->scanResult         =
                                "FILE INFECTED: [" . $a_filepath . "] (VIRUS: simulated)";
                        $this->logScanResult();
                        return $this->scanResult;
                }
                else
                {
                        $this->scanFileIsInfected = false;
                        $this->scanResult         = "";
                        return "";
                }
        }
 
        function cleanFile($a_filepath, $a_origname = "")
        {
                // This function needs to be redefined in child classes
                // It should:
                // - call the external cleaner
                // - set cleanFilePath to a_filepath
                // - set cleanFileOrigName to a_origname
                // - set cleanFileIsCleaned according the clean result
                // - set cleanResult to the cleaner output message
                // - call logCleanResult in any case
                // - return the output message, if file is cleaned
                // - return an empty string, if file is not cleaned
 
                $this->cleanFilePath     = $a_filepath;
                $this->cleanFileOrigName = $a_origname;
 
                if($a_origname == "cleanable.txt")
                {
                        $this->cleanFileIsCleaned = true;
                        $this->cleanResult        =
                                "FILE CLEANED: [" . $a_filepath . "] (VIRUS: simulated)";
                        $this->logCleanResult();
                        return $this->cleanResult;
                }
                else
                {
                        $this->cleanFileIsCleaned = false;
                        $this->cleanResult        =
                                "FILE NOT CLEANED: [" . $a_filepath . "] (VIRUS: simulated)";
                        $this->logCleanResult();
                        return "";
                }
        }
 
        function fileCleaned()
        {
                return $this->cleanFileIsCleaned;
        }
 
        function logScanResult()
        {
                $mess = "Virus Scanner (" . $this->type . ")";
                if($this->scanFileOrigName)
                {
                        $mess .= " (File " . $this->scanFileOrigName . ")";
                }
                $mess .= ": " . preg_replace('/[\r\n]+/', "; ", $this->scanResult);
 
                $this->log->write($mess);
        }
 
        function logCleanResult()
        {
                $mess = "Virus Cleaner (" . $this->type . ")";
                if($this->cleanFileOrigName)
                {
                        $mess .= " (File " . $this->cleanFileOrigName . ")";
                }
                $mess .= ": " . preg_replace('/[\r\n]+/', "; ", $this->cleanResult);
 
                $this->log->write($mess);
        }
 
        function getScanResult()
        {
                return $this->scanResult;
        }
 
        function getCleanResult()
        {
                return $this->cleanResult;
        }
 
        function getScanMessage()
        {
                if($this->scanFileIsInfected)
                {
                        $ret = sprintf($this->lng->txt("virus_infected"), $this->scanFileOrigName);
                }
                else
                {
                        $ret = sprintf($this->lng->txt("virus_not_infected"), $this->scanFileOrigName);
                }
 
                if($this->scanResult)
                {
                        $ret .= " " . $this->lng->txt("virus_scan_message")
                                . "<br />"
                                . str_replace($this->scanFilePath, $this->scanFileOrigName,
                                        nl2br($this->scanResult));
                }
                return $ret;
        }
 
        function getCleanMessage()
        {
                if($this->cleanFileIsCleaned)
                {
                        $ret = sprintf($this->lng->txt("virus_cleaned"), $this->cleanFileOrigName);
                }
                else
                {
                        $ret = sprintf($this->lng->txt("virus_not_cleaned"), $this->cleanFileOrigName);
                }
 
                if($this->cleanResult)
                {
                        $ret .= " " . $this->lng->txt("virus_clean_message")
                                . "<br />"
                                . str_replace($this->cleanFilePath, $this->cleanFileOrigName,
                                        nl2br($this->cleanResult));
                }
                return $ret;
        }
 
        function getScanZipFiles()
        {
                return $this->scanZipFiles;
        }
}