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<?php defined('SYSPATH') or die('No direct script access.');
/**
* Dns helper class.
*
* $Id: dns.php
*
* @package Core
* @author Kliment Michal
* @copyright (c) 2009 Kliment Michal
*/
class dns {

/**
* Create reverse dns lookup from ip address
*
* @author Michal Kliment
* @param string ip address
* @return string
*/
public static function create_reverse_dns_lookup_from_ip_address($ip_address)
{
if ($ip_address == '') return '';

$segments = explode('.', $ip_address);
$segments = array_reverse($segments);

return implode('.', $segments).'.IN-ADDR.ARPA.';
}

/**
* Get ptr (reverse) record from ip address
*
* @author Michal Kliment
* @param string ip address
* @return string
*/
public static function get_ptr_record($ip_address)
{
if (!valid::ip($ip_address)) return '';

$result = @dns_get_record(dns::create_reverse_dns_lookup_from_ip_address($ip_address), DNS_PTR);

if (!$result || count($result)!=1) return '';
return $result[0]['target'];
}

} // End dns
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