<?
///////////////////////////////////////////////////////////////////////////
//
//    DNSBL - Spam IP address checker.
//    Copyright (C) 2011 Alexey A.Znayev
//
//    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/>.
//
//    Alexey A.Znayev, znaeff@mail.ru, http://xbsoft.org, http://xbsoft.ru
//
///////////////////////////////////////////////////////////////////////////

// This file contains public class DNSBL

// This class performs IP address check in spam blocking lists as described
// on http://ru.wikipedia.org/wiki/RBL

class DNSBL {

    private $_aCheckers = array(	// list of checkers available for individual checking
	    'spamhaus' 	=> array('.zen.spamhaus.org', true), 	//available for group checking with 'all' key
	    'spamcop' 	=> array('.bl.spamcop.net',   true),	//available for group checking with 'all' key
	    'dsbl' 	=> array('.list.dsbl.org',    false),	//not available for group checking with 'all' key
	    'ordb' 	=> array('.relays.ordb.org',  false),	//not available for group checking with 'all' key
	    'sorbs' 	=> array('.dnsbl.sorbs.net',  false),	//not available for group checking with 'all' key
	    'njabl' 	=> array('.dnsbl.njabl.org',  false)	//not available for group checking with 'all' key
    ); // AZ - 1. Key 'all' is illegal
       // AZ - 2. Most of spammer IP addresses is covered by 'spamhaus' & 'spamcop' (and they are fast),
       //         some of the rest may not work sometimes, you can make them group checking available after individual testing
    
    private $_sDefaultChecker = 'spamhaus';

///////////////////////////////////////////////////////////////////////////
// CheckSpamIP - check IP for spam in checkers : given, default or all available for group checking (may be slow)
// parameters:
// string $ip - ip address
// string $checker - checker name or 'all' or nothing
// returns:
// true when IP exitsts in spam-lists of $checker or at least one of all checkers
// false when not or when ip address is local or not correct
    public function CheckSpamIP($ip, $checker = ''){
	if(empty($ip)) return false;
	if(preg_match('/^\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}$/', $ip) != 1) return false;
	$octets = explode('.', $ip);
	if($octets[0] == '127') return false;
	if($octets[0] == '10') return false;
	if($octets[0] == '192' && $octets[0] == '168') return false;
	if($octets[0] == '169' && $octets[0] == '254') return false;	// ms windows
	if((int)$octets[0] > 255 || (int)$octets[1] > 255 || (int)$octets[2] > 255 || (int)$octets[3] > 255 ) return false;
	$ret_val = false;
	$PTR = implode(array_reverse($octets), '.');
	if($checker === 'all'){
	    foreach(array_values($this->_aCheckers) as $c){
		if($c[1]){
		    $ret_val = $ret_val || $this->_CheckDNSAnswer(dns_get_record($PTR . $c[0], DNS_A));
		}
		if($ret_val) break;
	    }
	}else if(array_key_exists($checker, $this->_aCheckers)){
    	    $ret_val = $this->_CheckDNSAnswer(dns_get_record($PTR . $this->_aCheckers[$checker][0], DNS_A));
	}else{
    	    $ret_val = $this->_CheckDNSAnswer(dns_get_record($PTR . $this->_aCheckers[$this->_sDefaultChecker][0], DNS_A));
	}
	return $ret_val;
    }

///////////////////////////////////////////////////////////////////////////
// GetCheckers - gets list of available checker names
// returns:
// array of strings
    public function GetCheckers(){
	return array_keys($this->_aCheckers);
    }        

///////////////////////////////////////////////////////////////////////////
// GetGroupCheckers - gets list of checker names available for group checking with 'all' key
// returns:
// array of strings
    public function GetGroupCheckers(){
	$ret_val = array();
	foreach(array_keys($this->_aCheckers) as $k) if($this->_aCheckers[$k][1]) array_push($ret_val, $k);
	return $ret_val;
    }        

///////////////////////////////////////////////////////////////////////////
// GetDefaultChecker - gets default checker name
// returns:
// string
    public function GetDefaultChecker(){
	return $this->_sDefaultChecker;
    }

///////////////////////////////////////////////////////////////////////////
// SetDefaultChecker - sets default checker name
// parameters:
// string $new_checker - new default checker name
// returns:
// true when success
// false when failed ($new_checker is not in the list of available checker names)
    public function SetDefaultChecker($new_checker){
	if(array_key_exists($new_checker, $this->_aCheckers)){
	    $this->_sDefaultChecker = $new_checker;
	    return true;
	}else{
	    return false;
	}
    }

///////////////////////////////////////////////////////////////////////////
// EnableGroupChecking - sets checker available for group checking
// parameters:
// string $checker - checker name
// returns:
// true when success ($checker is included)
// false when failed ($checker is not in the list of available checker names)
    public function EnableGroupChecking($checker){
	if(array_key_exists($checker, $this->_aCheckers)){
	    $this->_aCheckers[$checker][1] = true;
	    return true;
	}else{
	    return false;
	}
    }

///////////////////////////////////////////////////////////////////////////
// DisableGroupChecking - sets checker not available for group checking
// parameters:
// string $checker - checker name
// returns:
// true when success ($checker is excluded)
// false when failed ($checker is not in the list of available checker names)
    public function DisableGroupChecking($checker){
	if(array_key_exists($checker, $this->_aCheckers)){
	    $this->_aCheckers[$checker][1] = false;
	    return true;
	}else{
	    return false;
	}
    }

// private methods

///////////////////////////////////////////////////////////////////////////
// _CheckDNSAnswer - checks DNS-server answer for 127.0.0.* values
// returns:
// true when success
// false when failed
    private function _CheckDNSAnswer($dns_answer){
	if(!is_array($dns_answer)) return false;
	$len = count($dns_answer);
	if($len <= 0) return false;
	for($i=0; $i<$len; $i++){
	    $obj = $dns_answer[$i];
	    if(!(is_object($obj) || is_array($obj))) return false;
	    $ip_str = $obj['ip'];
	    if(!is_string($ip_str)) return false;
	    $pos = strpos($ip_str, '127.0.0.');
	    if($pos !== false) return true;
	}
	return false;
    }        

} // end of class DNSBL

?>
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	<title>Mountainbike &#8211; Christian Aurich</title>
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	<link>http://c-aurich.de/wordpress</link>
	<description>all about my personal interests</description>
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		<title>Heutige MTB Tour</title>
		<link>http://c-aurich.de/wordpress/2011/11/heutige-mtb-tour/</link>
		<comments>http://c-aurich.de/wordpress/2011/11/heutige-mtb-tour/#respond</comments>
		<pubDate>Wed, 02 Nov 2011 18:16:58 +0000</pubDate>
		<dc:creator><![CDATA[Christian]]></dc:creator>
				<category><![CDATA[leipzig]]></category>
		<category><![CDATA[htwk]]></category>
		<category><![CDATA[Mountainbike]]></category>

		<guid isPermaLink="false">http://c-aurich.de/wordpress/?p=344</guid>
		<description><![CDATA[&#160; Heute ging es zu dritt erst auf den Zschocherschen Scherbelberg um anschließend neue Wege in Richtung Cossi zu erkunden. Es hat sehr viel Spaß gemacht &#8211; ich kann die Runde nur Jedem empfehlen, der gern MTB fährt! Große Teile davon machen aber auch mit Tourenrädern Spaß. http://www.gps-tour.info/en/tracks/detail.92498.html]]></description>
				<content:encoded><![CDATA[<p>&nbsp;</p>
<p><span class="Apple-style-span" style="line-height: 18px;"><a style="color: #ed1e24; text-decoration: underline;" href="http://c-aurich.de/wordpress/wp-content/uploads/2011/11/logo_6.png"><img class="alignleft size-full wp-image-345" style="border-style: initial; border-color: initial;" title="logo_6" src="http://c-aurich.de/wordpress/wp-content/uploads/2011/11/logo_6.png" alt="" width="250" height="131" /></a></span></p>
<p>Heute ging es zu dritt erst auf den Zschocherschen Scherbelberg um anschließend neue Wege in Richtung Cossi zu erkunden. Es hat sehr viel Spaß gemacht &#8211; ich kann die Runde nur Jedem empfehlen, der gern MTB fährt! Große Teile davon machen aber auch mit Tourenrädern Spaß.</p>
<p><a href="http://www.gps-tour.info/en/tracks/detail.92498.html">http://www.gps-tour.info/en/tracks/detail.92498.html</a></p>
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		<title>HTWK Mountainbike Treff</title>
		<link>http://c-aurich.de/wordpress/2011/11/htwk-mountainbike-treff/</link>
		<comments>http://c-aurich.de/wordpress/2011/11/htwk-mountainbike-treff/#comments</comments>
		<pubDate>Wed, 02 Nov 2011 12:44:40 +0000</pubDate>
		<dc:creator><![CDATA[Christian]]></dc:creator>
				<category><![CDATA[leipzig]]></category>
		<category><![CDATA[htwk]]></category>
		<category><![CDATA[Mountainbike]]></category>

		<guid isPermaLink="false">http://c-aurich.de/wordpress/?p=334</guid>
		<description><![CDATA[wie viele wissen, leite ich auch dieses Semester wieder den HTWK Mountainbiketreff. Diesmal nicht alleine sondern mit Jens, aber an dem Treff wird sich dadurch nicht viel ändern. Ich habe vom letzten Treff im Oktober mal den Track hochgeladen: http://www.gps-tour.info/en/tracks/detail.92482.html Ich hoffe dann auch alle weiteren Tracks dort zu veröffentlichen. Damit ist dann für die &#8230; <p class="link-more"><a href="http://c-aurich.de/wordpress/2011/11/htwk-mountainbike-treff/" class="more-link">Continue reading<span class="screen-reader-text"> "HTWK Mountainbike Treff"</span></a></p>]]></description>
				<content:encoded><![CDATA[<p>wie viele wissen, leite ich auch dieses Semester wieder den HTWK Mountainbiketreff. Diesmal nicht alleine sondern mit Jens, aber an dem Treff wird sich dadurch nicht viel ändern.</p>
<p>Ich habe vom letzten Treff im Oktober mal den Track hochgeladen: http://www.gps-tour.info/en/tracks/detail.92482.html Ich hoffe dann auch alle weiteren Tracks dort zu veröffentlichen. Damit ist dann für die Teilnehmer schön zu sehen, wo wir lang gefahren sind. </p>
<p>Falls noch jemand mitfahren möchte: es sind noch einige Plätze frei! MTB mit Licht und ein Helm reichen zum teilnehmen schon aus. Treff ist in den geraden Wochen Mittwoch 16:00 und in ungeraden Wochen 18:30 an der HTWK Sporthalle (Hintereingang).</p>
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