///////////////////////////////////////////////////////////////////////////
//
// 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 .
//
// 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
?>
Cuando se ha de realizar un proyecto conjuntamente con otros miembros, se ha de mantener sincronizados los recursos y poder disponer de ellos cuando se necesite. En esta guía vamos a explicar cómo usar Google Code para tener sincronizados nuestros proyectos mediante SVN.
Antes de proseguir, para quien no lo sepa, gracias a Google Code disponemos de una plataforma donde tener los recursos de nuestro proyecto (hasta 4GB), subir/descargar cualquier material referente al mismo (fotos, esquemas, documentos… límite 50MB) y mantener una documentación clara y ordenada del mismo; revisión online del código, Wiki y un panel de control bastante completo. La guía se basa en un ejemplo para utilizar Eclipse como IDE.
Es posible que tengamos por casa algún que otro PC que se ha quedado algo anticuado y nos da lástima desprendernos de él… aún así le podemos dar un uso más «seguro» que simplemente convertirlo a media center o ponerle el torrent y ala… a bajar. Aquí os mostramos una alternativa, convertirlo a un servidor NAS mediante FreeNAS.
Comentarios recientes