File Source for login.php

<?php
/**
* login
*
* @copyright (c) 2004-15 bitweaver.org
*
* @package users
* @subpackage functions
*/
/**
* required setup
*/
include_once ("../kernel/setup_inc.php");
if( !empty( $_REQUEST['returnto'] ) ) {
$_SESSION['returnto'] = $_REQUEST['returnto'];
} elseif( !empty( $_SERVER['HTTP_REFERER'] ) && !strpos( $_SERVER['HTTP_REFERER'], 'login.php' ) && !strpos( $_SERVER['HTTP_REFERER'], 'register.php' ) ) {
$from = parse_url( $_SERVER['HTTP_REFERER'] );
if( !empty( $from['path'] ) && $from['host'] == $_SERVER['SERVER_NAME'] ) {
$_SESSION['loginfrom'] = $from['path'].'?'.( !empty( $from['query'] ) ? $from['query'] : '' );
}
}
if( $gBitUser->isRegistered() ) {
bit_redirect( $gBitSystem->getDefaultPage() );
}
if( !empty( $_REQUEST['error'] ) ) {
$gBitSmarty->assign( 'error', $_REQUEST['error'] );
$gBitSystem->setHttpStatus( HttpStatusCodes::HTTP_UNAUTHORIZED );
}
$gBitSmarty->assign( 'metaKeywords', 'Login, Sign in, Registration, Register, Create new account' );
$gBitSystem->display( 'bitpackage:users/login.tpl', $gBitSystem->getConfig( 'site_title' ).' Login' , array( 'display_mode' => 'display' ));
?>

Source for file login.php