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File: DNSBL.php

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  Classes of Alexey Znaev  >  DNSBL  >  DNSBL.php  >  Download  
File: DNSBL.php
Role: Class source
Content type: text/plain
Description: DNSBL class
Class: DNSBL
Check spam IP address in DNS black lists
Author: By
Last change: Update.
Added new feature - group checking. It means that checking for 'all' key will be processed by checkers that available
for group checking only.
So if you issue "CheckSpamIP($ip, 'all')" then this ip will be checked not in all available checkers but in group available ones only.
There are 2 group available checkers by default: 'spamhaus' & 'spamcop'.
You can enable and disable group checking for any checker.
New public methods added for group checking control:
'GetGroupCheckers', 'EnableGroupChecking', 'DisableGroupChecking'.
example.php shows all changes well.
Date: 4 years ago
Size: 6,897 bytes
 

Contents

Class file image Download
<?
///////////////////////////////////////////////////////////////////////////
//
// 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

?>