<?php
/**
 * @class UserMgr

 * @version $Id: UserMgr.php 2926 2015-06-01 14:01:53Z elena $

 * 
 */

/*
define('DATAPATH', USERPATH.'WS/');
define('REQPATH',USERPATH.'REQ/');
define('RESDIRNAME',USERPATH.'RES/');
define('TTPATH', USERPATH.'TT/');
define('JOBPATH', USERPATH.'jobs/');
*/

class UserMgr 
{
	public $user, $IP, $userdir;
	protected $passwd;
	protected $sessionID;
	protected $userDirs = array('USERWSDIR' => 'WS', 'USERREQDIR' => 'REQ', 'USERDATADIR' => 'DATA',
					'USERWORKINGDIR' =>'RES', 'USERTTDIR' => 'TT', 'USERJOBDIR' => 'JOBS',
					'USERTEMPDIR' => 'TEMP');	

	protected $userGrps;

	protected $amdaClient; //client to dd webservice
	
	public $isFirst = false;

	public $isOldWS = true;

	public $isNewInfo = false;
	public $isSpecialInfo = null;

	function __construct($username = NULL, $password = NULL, $sessionID = NULL) 

	{	 

      // if magic quotes is on, stripslashes

		if(get_magic_quotes_gpc()) {

			$in = array(&$_GET, &$_POST, &$_COOKIE);

			while(list($k,$v) = each($in)) {
				foreach($v as $key => $val) {
					if(!is_array($val)) {

						$in[$k][$key] = stripslashes($val);
						continue;
					}
					$in[] =& $in[$k][$key];
				}
			}
			unset($in);

		}

		if (isset($_POST['username'])) {

			// Process Guest Login

			if (strcasecmp(trim($_POST['username']),"guest") == 0) {

				$this->processGuestLogin();
			}

			else {

				$this->user = trim($_POST['username']);
			}
		}
		else if (isset($username))
			$this->user = trim($username);

		//TODO crypt / decrypt

		if (!isset($this->passwd)) {

			if (isset($_POST['password'])) 
					$this->passwd = $_POST['password'];
			else if (isset($password))
					$this->passwd = $password;
		}

		if (isset($_GET['sessionID'])) 
			$this->user = $_GET['sessionID'];
		else if (isset($sessionID))
			$this->user = $sessionID;

		//TODO if AmdaClient is needed ?
		$this->amdaClient = new AmdaClient();

	}

	//TODO if needed?? set session ID
	protected function setID() {}

	public  function getIPclient()
	{
		/*
			REMOTE_ADDR is the only really reliable information,
			as it is transmitted to you by your web server that
			is handling the request. It can be theoretically 
			falsified as well, but that is much, much harder 
			than spoofing a header value, and an entirely different class of attack.
		*/
		if (getenv('REMOTE_ADDR'))  
		{       

			$realIP = getenv('REMOTE_ADDR'); 
			
			if ($realIP == '10.10.131.1' || $realIP == '10.10.135.119') { // proxy amdatest et openam; amdadev

				$allIPs = explode(',',$_SERVER['HTTP_X_FORWARDED_FOR']);
				$realIP = count($allIPs) > 1 ? trim($allIPs[0]) : $_SERVER['HTTP_X_FORWARDED_FOR'];
			}
		}          
		else 
		{
			//get local IP
			$command="hostname -i";
			$realIP = exec($command);
		}
		return $realIP;
	}

	public function getUserInfo()
	{

	// 	array("success"     => TRUE,
	// 		       "login"       => $login,
	// 		       "name"        => ($theUser->length > 0) ? $theUser->item(0)->getAttribute("name") : "undefined",
	// 		       "first_name"  => ($theUser->length > 0) ? $theUser->item(0)->getAttribute("first_name") : "undefined",
	// 		       "group"       => $this->getUserMemberGroups($login),
	// 		       "email"       => ($theUser->length > 0) ? $theUser->item(0)->getAttribute("email") : "undefined",
	// 		       "date"        => ($theUser->length > 0) ? $theUser->item(0)->getAttribute("date")  : "undefined",
	// 		       "news"        => ($theUser->length > 0) ? $theUser->item(0)->getAttribute("news")  : "0");
		$info =  $this->amdaClient->getUserInfo($this->user);
		$wsSize = intval($this->getWsSize()/1024./1024.);
		$quota = intval($this->getSpecialSettings()/1024./1024.);
		$info['total'] = $quota;
		$info['available'] = $quota - $wsSize;
		$info['used'] = $wsSize;
		
		return $info;

	}

	public function createDir() 
	{ 
		if (!mkdir($this->userdir, 0755, true)) return false;

		foreach ($this->userDirs as $key => $val) {

			if (!mkdir($this->userdir.$val.'/', 0755, true)) return false;
		}
		return true;
	}

	
	protected function getUserGrps() 
	{
		$info = $this->amdaClient->getUserInfo($this->user); 
		

		if (empty($info['group']))

				return null;
		else
				return explode(',',$info['group']);
	}

	/*
	* Check if special groups with settings exist and user is from these groups
	* Take the first group from user list
	*/

	protected function isSpecialGroup() 
	{

		$specialGrps = new DomDocument("1.0");

		if (!($specialGrps->load(specialGrpsXml))) return null; 

		$specialGrpNode = null;

		foreach ($this->userGrps as $grp) {

			$specialGrpNode = $specialGrps->getElementById($grp); 
			if ($specialGrpNode) break;                            
		}
		
		return $specialGrpNode;
	}

	public function getSpecialSettings()
	{
		$userSettings = new DomDocument("1.0");

		if (!file_exists(specialSettingsXml) || !$userSettings->load(specialSettingsXml)) {
			return DISK_QUOTA_standard;    
		}
		
		$theUser = $userSettings->getElementById($this->user);
		if (!$theUser) {
			return  DISK_QUOTA_standard;
		}
		
		$settings = $theUser->getElementsByTagName("setting");        
		if ($settings->length == 0) {
			return DISK_QUOTA_standard;
		}
		
		foreach ($settings as $setting) {                            
			if ($setting->getAttribute("name") == 'DISK_QUOTA')
				return $setting->getAttribute("value");                   
		}	 
		
	}
	

	public function setSpecialSettings() 

	{	

		$userSettings = new DomDocument("1.0");

		if (!file_exists(specialSettingsXml) || !$userSettings->load(specialSettingsXml)) {

			define("DISK_QUOTA", DISK_QUOTA_standard);    
			return; 
		}

		$theUser = $userSettings->getElementById($this->user);
		if (!$theUser) {
			define("DISK_QUOTA", DISK_QUOTA_standard);
			return;
		}
		$settings = $theUser->getElementsByTagName("setting");        
		if ($settings->length == 0) {
			define("DISK_QUOTA", DISK_QUOTA_standard);
			return;
		}

		foreach ($settings as $setting) {                            

			$key = $setting->getAttribute("name");
			$value =  $setting->getAttribute("value");
			$isSetting = $setting->hasAttribute("isSetting");                   
			if ($isSetting) {
				ini_set("$key",$value);
				}
			else {
				// Attention !!!  CONSTANT cannot be redefined
				define("$key",$value);                    
			}           
		} 		

	}

/*
*  Totally replace IMPEX staff in user remote tree
*/

	protected function updateImpex()
	{
		$myRemoteBases = new DomDocument("1.0");   

		if (!@$myRemoteBases->load(USERWSDIR.'RemoteParams.xml')) return false;

		$myBases = $myRemoteBases->getElementsByTagName('dataCenter');

		if ($myBases->length < 1) return false;
		// Delete all impex staff at first
		$i = $myBases->length - 1; 

		while ($i > -1) 
		{ 
			$base = $myBases->item($i);
			$id = $base->getAttribute('xml:id'); 

			if ($id == 'FMI_GUMICS')
			{
				$simuRemoteBases = new DomDocument("1.0"); 
				$simuRemoteBases->load(USERWSDIR.'RemoteParams.xml');
			
				$gumicsNode = $simuRemoteBases->getElementById('FMI_GUMICS');
				if ($gumicsNode != NULL)
					$gumicsRuns = $gumicsNode->getElementsByTagName('runID');
			}

			if (($base->hasAttribute('isSimulation')) || $id == "CLWeb") 
			{ 
				$base->parentNode->removeChild($base);   
			}                  
			$i--; 
		} 

		$remoteBases = new DomDocument("1.0");
		if (!$remoteBases->load(RemoteData.'Bases.xml')) return false;
		
		$bases = $remoteBases->getElementsByTagName('dataCenter');
		if ($bases->length < 1) return false;   

		$myRootElement = $myRemoteBases->documentElement; 

		// and add impex
		foreach ($bases as $base) 
		{
			//TODO && $id != 'FMI_GUMICS' or ! hasAttribute('isAddable')
			if ($base->hasAttribute('isSimulation')) 
			{													
				$baseId = $base->getAttribute('xml:id');

				$baseXml = new DomDocument("1.0");
				// no data base description ; skip this data base  
				if (!file_exists(RemoteData.$baseId.'/base.xml')) continue;

				// can't read base.xml ; skip this data base

				if (!@$baseXml->load(RemoteData.$baseId.'/base.xml'))  continue;                                                          

																																							
				$myBase = $myRemoteBases->importNode($baseXml->getElementById($baseId), true);
				$myBase->setAttribute('name', $base->getAttribute('name'));
				$myBase->setAttribute('desc', $base->getAttribute('desc'));
					
				if ($baseId == "FMI_GUMICS")
				{
					$gumicsSimuReg = $myRemoteBases->getElementById('FMI_GUMICS_Earth_Magnetosphere');
										
					if (($gumicsSimuReg != NULL)&& ($gumicsRuns->length > 0))
					{ 
						for($c = 0; $c < $gumicsRuns->length; $c++)
						{
							$node = $gumicsRuns->item($c);
							$node = $myRemoteBases->importNode($node, true);
							$gumicsSimuReg->appendChild($node); 
						} 
					}

				} 
				// Check if WebService is ON				 
				$center = new $baseId(); 			 							  
				$myBase->setAttribute('available',$center->monitor());
 									

				$myRootElement->appendChild($myBase); 
			}

		} 
		

		return $myRemoteBases->save(USERWSDIR.'RemoteParams.xml');
	} 
    

/*

*  make remote data tree from list of distant bases if it doezn't exist

*/ 

protected function makeRemoteTree() 

	{  
		$remoteBases = new DomDocument("1.0");

unlink(USERWSDIR.'RemoteParams.xml');

		if (file_exists(USERWSDIR.'RemoteParams.xml')) 
		{
			// replace IMPEX nodes
			$status = $this->updateImpex();
			
			if (!$status) 
				error_log('IMPEX Remote Base can not be updated',1,email);
			// check/change access rights
			$remoteBases->load(USERWSDIR.'RemoteParams.xml');
			$bases = $remoteBases->getElementsByTagName('dataCenter');
			
			$delete = new UserDeleteObsolete();
			if ($bases->length > 0) 
				foreach ($bases as $base) 
				{
					$baseId = $base->getAttribute('xml:id');

					if ($base->getAttribute('isSimulation')) continue;

					
// 					$notAvailable = (array_search($baseId,$availableMis) === FALSE);
// 				   $base->setAttribute('available',!$notAvailable);

					// Update Info on External Data Sets in RemoteTree.xml for everything except IMPEX

					$dataSets = $base->getElementsByTagName("dataset");
					if ($dataSets->length > 0) 
					{
						$baseExtDom = new DomDocument("1.0");
						if (!$baseExtDom->load(RemoteData.$baseId.'/base.xml')) 
						{ 
							$base->setAttribute("desc","ATTENTION!!! This Base set DOES NOT ANY MORE EXIST!!! Remove it from your tree");                                                                         
							$base->setAttribute('obsolete', true);
							error_log('NO '.RemoteData.$baseId.'/base.xml',1,email);
							continue;
						}
						foreach ($dataSets as $dataSet) 
						{
							$dataSetID = $dataSet->getAttribute("xml:id");
							$origDataSet = $baseExtDom->getElementById($dataSetID);
							if ($origDataSet != null) 
							{
								$desc = $origDataSet->getAttribute("desc");
								if ($desc != null) $dataSet->setAttribute("desc", $desc);
							}
							else 
							{                                        
								$delete->setVI($dataSet->getAttribute('name'));                               
								$res = $delete->deleteDerived();                                                                           
								$res = $delete->deleteConditions();                                      
								$res = $delete->deleteRequests();                                                                               
								$res = $delete->deleteAliases();                                                                                                              

								$dataSet->setAttribute("desc","ATTENTION!!! This data set DOES NOT EXIST ANY MORE !!! Remove it from your tree");                    

								$dataSet->setAttribute('obsolete', true);
							}
						}
					}                  
				} 
																																																																							
			return $remoteBases->save(USERWSDIR.'RemoteParams.xml'); 
		}	 

		$remoteBases->load(RemoteData.'Bases.xml');
		$bases = $remoteBases->getElementsByTagName('dataCenter');

		if ($bases->length == 0) return 'NO REMOTE BASES';         

		$paramMgr = new RemoteParamManager();

		$paramMgr->xmlDom = new DomDocument("1.0");
		$paramMgr->xmlDom->formatOutput = true;
		$paramMgr->xmlDom->preserveWhiteSpace = false;

		$BASE = $paramMgr->xmlDom->createElement('dataRoot'); 
		$BASE->setAttribute('xml:id','myRemoteData-treeRootNode');

		$baseXml = new DomDocument("1.0");

		foreach ($bases as $base) 
		{	     

			$baseId = $base->getAttribute('xml:id');
			$paramMgr->baseId = $baseId;

			// no data base description ; skip this data base  

			if (!@file_exists(RemoteData.$baseId.'/base.xml')) continue;

			// can't read base.xml ; skip this data base

			if (!@$baseXml->load(RemoteData.$baseId.'/base.xml')) continue;			        			      

			if ($base->hasAttribute('default'))  
			{ 
				if ($base->hasAttribute('isSimulation'))

				{

					$centerNode = $paramMgr->xmlDom->importNode($baseXml->getElementById($baseId), true);
					$datasets = $centerNode->getElementsByTagName('dataset');
					foreach ($datasets as $dataset)

					{
						$infoFileName = $paramMgr->getInfoName($dataset->getAttribute('name'));
						$paramMgr->localInfo = RemoteData.$baseId.'/'.$infoFileName;

						if (!@file_exists($paramMgr->localInfo)) continue;				 

						$params = $dataset->getElementsByTagName('parameter');
						$paramMgr->remoteViId = $dataset->getAttribute('name');
						foreach ($params as $param) 
						{

							$paramMgr->paramId = $param->getAttribute('name');
							$paramGlobalId =  $param->getAttribute('xml:id');				  
							$paramMgr->paramXML = RemoteData.'PARAMS/'.$paramGlobalId.'.xml';	
										

							if (!@file_exists($paramMgr->paramXML)) continue;

							if (!$paramMgr->paramDom) 

									$paramMgr->paramDom = new DomDocument("1.0");

							$paramMgr->paramDom->load($paramMgr->paramXML);
							
							if (!$paramMgr->makeComponents($param)) continue;
						}

					}
				}
				/*
				*   Some small & well known data centers are included by default: 
				*   Each VI structure and VI (dataset) description at DDBASE for them should exist
				*/
				else 
				{
					$center = new $baseId();				
					$centerNode = $center->makeCenterNode($paramMgr->xmlDom);				

				}

			}
			else 
			{

				$centerNode = $paramMgr->xmlDom->importNode($base, true);

			}

			$centerNode->setAttribute('name', $base->getAttribute('name'));
			$centerNode->setAttribute('desc', $base->getAttribute('desc'));

			$centerNode->setAttribute('available',isset($notAvailable) ? !$notAvailable : TRUE);

			$BASE->appendChild($centerNode);  

		}  
		$paramMgr->xmlDom->appendChild($BASE);
				
		return $paramMgr->xmlDom->save(USERWSDIR.'RemoteParams.xml');

	}

	protected function processGuestLogin() 
	{
		if (!$this->check_email_address($_POST['password'])) 
		{
			die('<a href="index.html"><h3>Invalid e-mail address. Please, try once more.</h3></a>');
		}
		
		$passwd = $_POST['password'];
		$IP = $this->getIPclient();
		$Guest = new Guest($IP,$passwd);
		// email and IP in guests.login
		$Guest->registerGuest();
		$Guest->checkGuestTimes();
		$user = $Guest->addGuest(); 

		if ($user == "allGuestLoginsInUse") 
		{
			die('<a href="index.html"><h3>Sorry, all guest accounts are currently in use. Please, try to login in 30 min.</h3></a>');  
		}
		
		$this->user = $user;
		$this->passwd = "guest";
	}    

 
/*****************************************************************
*                           PUBLIC FUNCTIONS
*****************************************************************/

	// migration from old to new AMDA
	public function convertWS() 
	{
		$convert = new UserWsTransfer($this->user); 

		$res = $convert->checkWS();
		if (!$res['success']) return $res;
		
		$res = $convert->transferMyData(); 
		$msg = $res['msg'];
	 
		$res = $convert->transferDerived();
		$msg .= $res['msg'];

		$res = $convert->transferTimeTables();
		$msg .= $res['msg'];

		$res = $convert->transferConditions();
		$msg .= $res['msg'];

// 		$res = $convert->transferRequests();
// 		$msg .= $res['msg'];

 
		$res = $convert->transferFilters();
		$msg .= $res['msg'];


	//	error_log('Transfer workspace from old AMDA for '.$this->user, 1, 'amda@irap.omp.eu');
		return array('success' => true, 'msg' => $msg);     
	}

	public function setPath() 
	{

		if (isset($_GET['sessionID'])) {

			$this->user = $_GET['sessionID'];
			$this->userdir = USERPATH."/".$this->user."/";                
		}
		// for testing purposes

// 		else if (defined('TRANSFERUSER')) {
// 			$this->userdir = BASE_PATH."test/".TRANSFERUSER."/";
// 		}

		else if (isset($this->user)) {

			$this->userdir = USERPATH."/".$this->user."/";
		}

		$usrdir = $this->userdir;

		define ("USERDIR", "$usrdir/");

		foreach ($this->userDirs as $key => $val) {

			$dir = $usrdir.$val;
			define("$key","$dir/");
		} 
	}

	public function ddCheckUser() 
	{

		$this->IP = $this->getIPclient();

		$cmdCheckUser =  "DDCheckUser ".$this->IP." ".$this->user." 1> /dev/null 2> /dev/null";   

		system($cmdCheckUser, $res);
		return $res;

	}

	public function ddLogin() 
	{
		$this->IP = $this->getIPclient();

		$loginCommd = "DDHtmlLogin ".$this->user." ".$this->passwd." ".$this->IP;

		system($loginCommd, $res);

		return $res;
	}

	public function init() 
	{ 
		if ($this->ddLogin() != 0) 
			die('<h2>You are trying to log in as '.$this->user.'<br/> Please check that you entered a valid password</h2>');

		$this->userdir = USERPATH."/".$this->user."/";

		if (!is_dir($this->userdir)) {           
			if (!$this->createDir()) { 

				die("Login for ".$this->user." failed: Can't create WS dirs");
			}

			$this->isFirst = true;   
			$convert = new UserWsTransfer($this->user); 

			$res = $convert->checkWS();
			if (!$res['success']) 
				$this->isOldWS = false;

		}

		if (file_exists($this->userdir.'newLogin')) {

			copy($this->userdir.'newLogin',$this->userdir.'lastLogin');
			$dt = filemtime($this->userdir.'newLogin');
			touch($this->userdir.'lastLogin', $dt);
		}
		else 
			touch($this->userdir.'lastLogin', time() - 5*86400); // last 5 days
		
		// if new info exists it will be shown to : 
		// public => to all
		// special => to group members

// 		if (file_exists($this->userdir.'newInfo')) 
// 		{                
// 			$amdaInfo = new AmdaNews($this->user);
// 			// if status = 0 - it is special info to group members only
// 			// else to all  
// 			$info = $this->getUserInfo($this->user);
// 			$status = $amdaInfo->makeInfo($info['group']); 
// 
// 			if ($status) $this->isNewInfo = true; 
// 					
// 			unlink($this->userdir.'newInfo');
// 		}

		touch($this->userdir.'newLogin');          

		$this->setPath(); 		

	
		$this->userGrps = $this->getUserGrps();
		  		
		if (!$this->makeLocalTree())
				die("Login for ".$this->user." failed: Can't make LocalParams.xml");;

		$ok = $this->makeRemoteTree();	                      		

		if (!file_exists(USERWSDIR.'Request.xml')) $reqMgr = new RequestMgr();
		if (!file_exists(USERWSDIR.'Tt.xml')) $ttMgr = new TimeTableMgr();

		if (!file_exists(USERWSDIR.'Alias.xml')) $ttMgr = new AliasMgr();

		//TODO sessionID = user + WSname
		$sessionID = $this->user;

		
		/*
		* Special settings are defined in the generic_data/SpecialSettings/Settings.xml
		*/
		$this->setSpecialSettings(); 
		

		/*

		* Special groups are defined in the generic_data/SpecialSettings/Groups.xml

		*/

		if ($this->userGrps) {
		//	$specialGroup = $this->isSpecialGroup();
			$specialGroup = false;
			// Special Info for special groups
			if ($specialGroup) {
				// Special Settings for special groups - first visit just copying
				if ($this->isFirst) {
					$grp = $specialGroup->getAttribute('xml:id');
					$tags = $specialGroup->getElementsByTagName('folder');

					foreach ($tags as $tag) {                 
						$folder = $tag->getAttribute('name');
						
						foreach (glob(SpecialSettingsDir.$grp."/".$folder."/*") as $file) {
							copy($file, $this->userdir.$folder."/".basename($file));
						} 
					}
					// mark to show help information
					touch($this->userdir."$grp"."Help");

				}

				// add requests
				else { }
				$grpName = $specialGroup->getAttribute('xml:id');
				$helpName = "$grpName"."Help";
	
				if (file_exists(HELPPATH.$helpName) && file_exists($this->userdir.$helpName))
								$this->isSpecialInfo = $helpName;

			}

		}
		return $sessionID;
	}

	protected function makeLocalTree()
	{
		if (file_exists(USERWSDIR.'LocalParams.xml'))
				unlink(USERWSDIR.'LocalParams.xml');  

		if (!copy(LocalData.'/LocalParams.xml', USERWSDIR.'LocalParams.xml'))

				die("Login for ".$this->user." failed: Can't copy LocalParams.xml"); 
				
		if ($this->userGrps)
				return $this->updateTreeForGrps(USERWSDIR.'LocalParams.xml');
				
		return true;
	}
	
	protected function updateTreeForGrps($file)
	{
		$xml = new DomDocument("1.0");
		
		if(!$xml->load($file)) 
			die("Login for ".$this->user." failed: Can't load LocalParams.xml");
		
		$xp = new domxpath($xml);                                                                             
	  
		foreach ($this->userGrps as $grp) {
			$nodes = $xp->query("//*[@group='".$grp."']");
			
			if ($nodes->length > 0)
				foreach ($nodes as $node) {
						$node->removeAttribute('group');
						if ($node->hasAttribute('restriction'))
								$node->removeAttribute('restriction');
				}
		}
		
		return $xml->save($file);
	}
	

	public function dirSize($dir) 
	{
		$handle = opendir($dir);

		$mas = 0;

		while ($file = readdir($handle)) {
			if ($file != '..' && $file != '.' && !is_dir($dir.'/'.$file)) {

				$mas += filesize($dir.'/'.$file);
			} 

			else if (is_dir($dir.'/'.$file) && $file != '..' && $file != '.') {

				$mas += $this->dirSize($dir.'/'.$file);
			}
		}
		return $mas;
	} 

	public function  getWsSize() 
	{
		$dirsToCheck = array(USERDATADIR, USERTTDIR, USERWORKINGDIR);
		$wsSize = 0;
		foreach ($dirsToCheck as $dir) 
			if (is_dir($dir)) $wsSize += $this->dirSize($dir);

		return $wsSize;
	}
	

	// http://www.ilovejackdaniels.com/php/email-address-validation/ 

	public function check_email_address($email) 
	{
		// First, we check that there's one @ symbol, and that the lengths are right
		if (!ereg("^[^@]{1,64}@[^@]{1,255}$", $email)) 
		{
		// Email invalid because wrong number of characters in one section, or wrong number of @ symbols.
			return false;
		}

		// Split it into sections to make life easier
		$email_array = explode("@", $email);
		$local_array = explode(".", $email_array[0]);
		for ($i = 0; $i < sizeof($local_array); $i++) 
		{
			if (!ereg("^(([A-Za-z0-9!#$%&'*+/=?^_`{|}~-][A-Za-z0-9!#$%&'*+/=?^_`{|}~\.-]{0,63})|(\"[^(\\|\")]{0,62}\"))$", $local_array[$i])) {
				return false;
			}
		}

		if (!ereg("^\[?[0-9\.]+\]?$", $email_array[1])) { // Check if domain is IP. If not, it should be valid domain name
			$domain_array = explode(".", $email_array[1]);
			if (sizeof($domain_array) < 2) {
				return false; // Not enough parts to domain
			}
			for ($i = 0; $i < sizeof($domain_array); $i++) 
			{
				if (!ereg("^(([A-Za-z0-9][A-Za-z0-9-]{0,61}[A-Za-z0-9])|([A-Za-z0-9]+))$", $domain_array[$i])) {
					return false;
				}
			}
		}
		return true;
	}         
}

?>