source: plugins/antispam/filters/class.dc.filter.iplookup.php @ 2566:9bf417837888

<?php
# -- BEGIN LICENSE BLOCK ---------------------------------------
#
# This file is part of Antispam, a plugin for Dotclear 2.
#
# Copyright (c) 2003-2013 Olivier Meunier & Association Dotclear
# Licensed under the GPL version 2.0 license.
# See LICENSE file or
# http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
#
# -- END LICENSE BLOCK -----------------------------------------
if (!defined('DC_RC_PATH')) { return; }

class dcFilterIpLookup extends dcSpamFilter
{
     public $name = 'IP Lookup';
     public $has_gui = true;
     public $help = 'iplookup-filter';

     private $default_bls = 'sbl-xbl.spamhaus.org , bsb.spamlookup.net';

     public function __construct($core)
     {
          parent::__construct($core);

          if (defined('DC_DNSBL_SUPER') && DC_DNSBL_SUPER && !$core->auth->isSuperAdmin()) {
               $this->has_gui = false;
          }
     }

     protected function setInfo()
     {
          $this->description = __('Checks sender IP address against DNSBL servers');
     }

     public function getStatusMessage($status,$comment_id)
     {
          return sprintf(__('Filtered by %1$s with server %2$s.'),$this->guiLink(),$status);
     }

     public function isSpam($type,$author,$email,$site,$ip,$content,$post_id,&$status)
     {
          if (!$ip || long2ip(ip2long($ip)) != $ip) {
               return;
          }

          $bls = $this->getServers();
          $bls = preg_split('/\s*,\s*/',$bls);

          foreach ($bls as $bl) {
               if ($this->dnsblLookup($ip,$bl)) {
                    // Pass by reference $status to contain matching DNSBL
                    $status = $bl;
                    return true;
               }
          }
     }

     public function gui($url)
     {
          $bls = $this->getServers();

          if (isset($_POST['bls']))
          {
               try {
                    $this->core->blog->settings->addNamespace('antispam');
                    $this->core->blog->settings->antispam->put('antispam_dnsbls',$_POST['bls'],'string','Antispam DNSBL servers',true,false);
                    dcPage::addSuccessNotice(__('The list of DNSBL servers has been succesfully updated.'));
                    http::redirect($url);
               } catch (Exception $e) {
                    $core->error->add($e->getMessage());
               }
          }

          /* DISPLAY
          ---------------------------------------------- */
          $res = dcPage::notices();

          $res .=
          '<form action="'.html::escapeURL($url).'" method="post" class="fieldset">'.
          '<h3>' . __('IP Lookup servers') . '</h3>'.
          '<p><label for="bls">'.__('Add here a coma separated list of servers.').'</label>'.
          form::textarea('bls',40,3,html::escapeHTML($bls),'maximal').
          '</p>'.
          '<p><input type="submit" value="'.__('Save').'" />'.
          $this->core->formNonce().'</p>'.
          '</form>';

          return $res;
     }

     private function getServers()
     {
          $bls = $this->core->blog->settings->antispam->antispam_dnsbls;
          if ($bls === null) {
               $this->core->blog->settings->addNamespace('antispam');
               $this->core->blog->settings->antispam->put('antispam_dnsbls',$this->default_bls,'string','Antispam DNSBL servers',true,false);
               return $this->default_bls;
          }

          return $bls;
     }

     private function dnsblLookup($ip,$bl)
     {
          $revIp = implode('.',array_reverse(explode('.',$ip)));

          $host = $revIp.'.'.$bl.'.';
          if (gethostbyname($host) != $host) {
               return true;
          }

          return false;
     }
}