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   1  <?php if (!defined('BB2_CORE')) die('I said no cheating!');
   2  
   3  // Specialized screening for trackbacks
   4  function bb2_trackback($package)
   5  {
   6      // Web browsers don't send trackbacks
   7      if ($package['is_browser']) {
   8          return 'f0dcb3fd';
   9      }
  10  
  11      // Proxy servers don't send trackbacks either
  12      if (array_key_exists('Via', $package['headers_mixed']) || array_key_exists('Max-Forwards', $package['headers_mixed']) || array_key_exists('X-Forwarded-For', $package['headers_mixed']) || array_key_exists('Client-Ip', $package['headers_mixed'])) {
  13          return 'd60b87c7';
  14      }
  15  
  16      // Fake WordPress trackbacks
  17      // Real ones do not contain Accept:, and have a charset defined
  18      // Real WP trackbacks may contain Accept: depending on the HTTP
  19      // transport being used by the sending host
  20      if (strpos($package['headers_mixed']['User-Agent'], "WordPress/") !== FALSE) {
  21          if (strpos($package['headers_mixed']['Content-Type'], "charset=") === FALSE) {
  22              return 'e3990b47';
  23          }
  24      }
  25      return false;
  26  }
  27  
  28  ?>