/components/com_travelbook/helpers/travelbook.php

<?php

/**

 * "TRAVELbook - JOOMLA! on Tour"

 *

 * @version         $Id: travelbook.php 2 2010-04-13 13:37:46Z WEB $

 * @copyright       Copyright 2009-2010, $Author: WEB $

 * @license         GNU General Public License (GNU GPL) GPLv2, 

 *                  - see http://www.demo-page.de/en/license-conditions.html

 *    This program is free software: you can redistribute it and/or modify

 *    it under the terms of the GNU General Public License as published by

 *    the Free Software Foundation, either version 3 of the License, or

 *    (at your option) any later version.

 *

 *    This program is distributed in the hope that it will be useful,

 *    but WITHOUT ANY WARRANTY; without even the implied warranty of

 *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. 

 *    See the GNU General Public License for more details.

 *

 *    You should have received a copy of the GNU General Public License

 *    along with this program. If not, see <http://www.gnu.org/licenses/>.

 *

 * @link            http://www.demo-page.de

 * @package         TRAVELbook Component

 * @revision        $Revision: 2 $

 * @lastmodified    $Date: 2010-04-13 15:37:46 +0200 (Di, 13 Apr 2010) $

*/



/*** No direct access ***/

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



/**

 * TRAVELbook Component Helper

 *

 * @static

 * @package		Joomla

 * @subpackage	Content

 * @since 1.5

 */

class TravelbookHelperTravelbook

{



	/**

	 *

	 *  @param $VisitorIp - valid only when true is returned

	 *  @return true on success

	 */



	function getVisitorIp(&$VisitorIp)

	{

		$Ip_tmp = null;

		// get usefull vars:

		$client_ip       = isset($_SERVER['HTTP_CLIENT_IP'])       ? $_SERVER['HTTP_CLIENT_IP']	      : NULL;

		$x_forwarded_for = isset($_SERVER["HTTP_X_FORWARDED_FOR"]) ? $_SERVER["HTTP_X_FORWARDED_FOR"] : NULL;

		$remote_addr     = isset($_SERVER['REMOTE_ADDR'])          ? $_SERVER['REMOTE_ADDR']	      : NULL;



		// then the script itself

		if (!empty($x_forwarded_for) && strrpos($x_forwarded_for, '.') > 0)

		{

			$arr = explode(',', $x_forwarded_for);

			$Ip_tmp = trim(end($arr));

		}



		if (!TravelbookHelperTravelbook::isIpAddressValidRfc3330($Ip_tmp) && !empty($client_ip))

		{

			$ip_expl = explode('.', $client_ip);

			$referer = explode('.', $remote_addr);



			if ($referer[0] != $ip_expl[0])

			{

				$Ip_tmp = trim(implode('.', array_reverse($ip_expl)));

			}

			else

			{

				$arr = explode(',', $client_ip);

				$Ip_tmp = trim(end($arr));

			}

		}



		if (!TravelbookHelperTravelbook::isIpAddressValidRfc3330($Ip_tmp) && !empty($remote_addr))

		{

			$arr = explode(',', $remote_addr);

			$Ip_tmp = trim(end($arr));

		}



		unset($client_ip, $x_forwarded_for, $remote_addr, $ip_expl, $referer);



		$VisitorIp = $Ip_tmp;

		return true;

	}



	function isIpAddressValidRfc3330( $ipAddress ) {



		$substr2 = substr( $ipAddress, 0, 2 );

		$substr3 = substr( $ipAddress, 0, 3 );

		$substr4 = substr( $ipAddress, 0, 4 );

		$substr6 = substr( $ipAddress, 0, 6 );

		$substr8 = substr( $ipAddress, 0, 8 );

		$substr10 = substr( $ipAddress, 0, 10 );

		$substr12 = substr( $ipAddress, 0, 12 );

		$IpAsLong = sprintf( "%u", ip2long( $ipAddress ) );



		return ( ( $ipAddress != NULL ) &&

			( $substr2 !== '0.' )     // Reserved IP block

			&& ( $substr3 !== '10.' ) // Reserved for private networks

			&& ( $substr3 !== '14.' ) // IANA Public Data Network

			&& ( $substr3 !== '24.' ) // Reserved IP block

			&& ( $substr3 !== '27.' ) // Reserved IP block

			&& ( $substr3 !== '39.' ) // Reserved IP block

			&& ( $substr4 !== '127.' ) // Reserved IP block

			&& ( $substr6 !== '128.0.' ) // Reserved IP block

			&& ( $substr8 !== '169.254.' ) // Reserved IP block

			&& ( ( $IpAsLong < sprintf( "%u", ip2long( '172.16.0.0' ) ) ) // Private networks

				|| $IpAsLong > sprintf( "%u", ip2long( '172.31.255.255' ) ) ) 

			&& ( $substr8 !== '191.255.' ) // Reserved IP block

			&& ( $substr8 !== '192.0.0.' ) // Reserved IP block

			&& ( $substr8 !== '192.0.2.' ) // Reserved IP block

			&& ( $substr10 !== '192.88.99.' ) // Reserved IP block

			&& ( $substr8 !== '192.168.' ) // Reserved IP block

			&& ( ( $IpAsLong < sprintf( "%u", ip2long( '198.18.0.0' ) ) ) // Multicast addresses

				|| ( $IpAsLong > sprintf( "%u", ip2long( '198.19.255.255' ) ) ) )

			&& ( $substr12 !== '223.255.255.' ) // Reserved IP block

			&& ( ( $IpAsLong < sprintf( "%u", ip2long( '224.0.0.0' ) ) ) // Multicast addresses

				|| ( $IpAsLong > sprintf( "%u", ip2long( '239.255.255.255' ) ) ) )

			&& ( ( $IpAsLong < sprintf( "%u", ip2long( '240.0.0.0' ) ) ) // Reserved IP blocks

				|| ( $IpAsLong > sprintf( "%u", ip2long( '255.255.255.255' ) ) ) )

		);



	}



}