<?php

   $debug= $_GET['debug'];
   
   if ($debug == 'y')
   {
   }
   
   header("Expires: Sat, 1 Jan 2000 00:00:00 GMT");
   header("Cache-Control: max-age=0, no-cache, no-store, must-revalidate");
   header("Pragma: no-cache");
   header("Content-type: image/png");

   $hostname = gethostbyaddr($_SERVER['REMOTE_ADDR']);
   $date = date('l dS \of F Y h:i:s A');

   // BT DOMAINS
   $bt_isp_expression = '/(';  

   $bt_isp_expression .= 'bt[.]com|';
   $bt_isp_expression .= 'bt[.]co[.]uk|';
   $bt_isp_expression .= 'bt[.]net|';
   $bt_isp_expression .= 'btinternet[.]com|';
   $bt_isp_expression .= 'btinternet[.]co[.]uk|';
   $bt_isp_expression .= 'btinternet[.]net|';
   $bt_isp_expression .= 'btbroadband[.]com|';
   $bt_isp_expression .= 'btbroadband[.]co[.]uk|';
   $bt_isp_expression .= 'btbroadband[.]net|';
   $bt_isp_expression .= 'britishtelecom[.]com|';
   $bt_isp_expression .= 'britishtelecom[.]co[.]uk|';
   $bt_isp_expression .= 'britishtelecom[.]net|';
   $bt_isp_expression .= 'btyahoo[.]com|';
   $bt_isp_expression .= 'btyahoo[.]co[.]uk|';
   $bt_isp_expression .= 'btyahoo[.]net|';
   $bt_isp_expression .= 'bt-yahoo[.]net|';
   $bt_isp_expression .= 'bt-yahoo[.]uk|';
   $bt_isp_expression .= 'bt-yahoo[.]com|';
   $bt_isp_expression .= 'btcentralplus[.]com|';
   $bt_isp_expression .= 'btcentralplus[.]co[.]uk|';
   $bt_isp_expression .= 'btcentralplus[.]net|';
   $bt_isp_expression .= 'btopenworld[.]com|';
   $bt_isp_expression .= 'btopenworld[.]co[.]uk|';
   $bt_isp_expression .= 'btopenworld[.]net|';

   $bt_isp_expression .= 'xyzzy.xyzzy'; //dummy final value
   $bt_isp_expression .= ')/';   

   // VIRGIN DOMAINS
   $virgin_isp_expression = '/(';  

   $virgin_isp_expression .= 'blueyonder[.]com|';
   $virgin_isp_expression .= 'blueyonder[.]co[.]uk|';
   $virgin_isp_expression .= 'blueyonder[.]net|';
   $virgin_isp_expression .= 'telewest[.]com|';
   $virgin_isp_expression .= 'telewest[.]co[.]uk|';
   $virgin_isp_expression .= 'telewest[.]net|';
   $virgin_isp_expression .= 'virginmedia[.]com|';
   $virgin_isp_expression .= 'virginmedia[.]co[.]uk|';
   $virgin_isp_expression .= 'virginmedia[.]net|';
   $virgin_isp_expression .= 'virgin[.]com|';
   $virgin_isp_expression .= 'virgin[.]co[.]uk|';
   $virgin_isp_expression .= 'virgin[.]net|';
   $virgin_isp_expression .= 'ntl[.]com|';
   $virgin_isp_expression .= 'ntl[.]co[.]uk|';
   $virgin_isp_expression .= 'ntl[.]net|';
   $virgin_isp_expression .= 'cableinet[.]com|';
   $virgin_isp_expression .= 'cableinet[.]co[.]uk|';
   $virgin_isp_expression .= 'cableinet[.]net|';

   $virgin_isp_expression .= 'xyzzy.xyzzy'; //dummy final value
   $virgin_isp_expression .= ')/';   

   // TALKTALK DOMAINS
   $talktalk_isp_expression = '/(';  

   $talktalk_isp_expression .= 'talktalk[.]com|';
   $talktalk_isp_expression .= 'talktalk[.]co[.]uk|';
   $talktalk_isp_expression .= 'talktalk[.]net|';
   $talktalk_isp_expression .= 'talktalkbusiness[.]com|';
   $talktalk_isp_expression .= 'talktalkbusiness[.]co[.]uk|';
   $talktalk_isp_expression .= 'talktalkbusiness[.]net|';
   $talktalk_isp_expression .= 'talktalkenterprise[.]com|';
   $talktalk_isp_expression .= 'talktalkenterprise[.]co[.]uk|';
   $talktalk_isp_expression .= 'talktalkenterprise[.]net|';
   $talktalk_isp_expression .= 'cpw-networks[.]com|';
   $talktalk_isp_expression .= 'cpw-networks[.]co[.]uk|';
   $talktalk_isp_expression .= 'cpw-networks[.]net|';
   $talktalk_isp_expression .= 'cpwnetworks[.]com|';
   $talktalk_isp_expression .= 'cpwnetworks[.]co[.]uk|';
   $talktalk_isp_expression .= 'cpwnetworks[.]net|';
   $talktalk_isp_expression .= 'opaltelecom[.]com|';
   $talktalk_isp_expression .= 'opaltelecom[.]co[.]uk|';
   $talktalk_isp_expression .= 'opaltelecom[.]net|';
   $talktalk_isp_expression .= 'opaltelecomltd[.]com|';
   $talktalk_isp_expression .= 'opaltelecomltd[.]co[.]uk|';
   $talktalk_isp_expression .= 'opaltelecomltd[.]net|';
   $talktalk_isp_expression .= 'opaltelecommunications[.]com|';
   $talktalk_isp_expression .= 'opaltelecommunications[.]co[.]uk|';
   $talktalk_isp_expression .= 'opaltelecommunications[.]net|';
   $talktalk_isp_expression .= 'dialbb[.]net|';
   $talktalk_isp_expression .= 'dialnb[.]net|';

   $talktalk_isp_expression .= 'xyzzy.xyzzy'; //dummy final value
   $talktalk_isp_expression .= ')/';   

   if (preg_match  ( $bt_isp_expression, $hostname, $matches) >0)
   {
      $bt_isp_name = $matches[0];
      $bt_isp_found = true;
   }
   else if (preg_match  ( $virgin_isp_expression, $hostname, $matches) >0)
   {
      $virgin_isp_name = $matches[0];
      $virgin_isp_found = true;
   }
   else if (preg_match  ( $talktalk_isp_expression, $hostname, $matches) >0)
   {
      $talktalk_isp_name = $matches[0];
      $talktalk_isp_found = true;
   }

   if ($bt_isp_found)
   {
      readfile('bt_warning.png');
   }
   else if ($virgin_isp_found)
   {
      readfile('virgin_warning.png');
   }
   else if ($talktalk_isp_found)
   {
      readfile('talktalk_warning.png');
   }
   else
   {
      readfile('no_warning.png');
   }

?>