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* * This version may have been modified pursuant * to the GNU General Public License, and as distributed it includes or * is derivative of works licensed under the GNU General Public License or * other free or open source software licenses. * See LICENSE for more details. * Proxy Detector v0.1 * copyrights by: Daantje Eeltink (me@daantje.nl) * http://www.daantje.nl * * first build: Mon Sep 18 21:43:48 CEST 2006 * last build: Tue Sep 19 10:37:12 CEST 2006 * * Description: * This class can detect if a visitor uses a proxy server by scanning the * headers returned by the user client. When the user uses a proxy server, * most of the proxy servers alter the header. The header is returned to * PHP in the array $_SERVER. * * License: * GPL v2 licence. (http://www.gnu.org/copyleft/gpl.txt) * * Support: * If you like this class and find it usefull, please donate one or two * coins to my PayPal account me@daantje.nl * * Todo: * Add open proxy black list scan. */ class proxy_detector { /** * CONSTRUCTOR * Set defaults... */ function proxy_detector() { $this->config = array(); $this->lastLog = ""; //set default headers $this->scan_headers = array( 'HTTP_VIA', 'HTTP_X_FORWARDED_FOR', 'HTTP_FORWARDED_FOR', 'HTTP_X_FORWARDED', 'HTTP_FORWARDED', 'HTTP_CLIENT_IP', 'HTTP_FORWARDED_FOR_IP', 'VIA', 'X_FORWARDED_FOR', 'FORWARDED_FOR', 'X_FORWARDED', 'FORWARDED', 'CLIENT_IP', 'FORWARDED_FOR_IP', 'HTTP_PROXY_CONNECTION' ); } /** * VOID setHeader( STRING $trigger ) * Set new header trigger... */ function setHeader($trigger) { $this->scan_headers[] = $trigger; } /** * ARRAY $triggers = getHeaders( VOID ) * Get all triggers in one array */ function getHeaders() { return $this->scan_headers; } /** * VOID setConfig( STRING $key, STRING $value) * Set config line... */ function setConfig($key, $value) { $this->config[$key] = $value; } /** * MIXED $config = getConfig( [STRING $key] ) * Get all config in one array, or only one config value as a string. */ function getConfig($key='') { if ($key) return $this->config[$key]; else return $this->config; } /** * STRING $log = getLog( VOID ) * Get last logged information. Only works AFTER calling detect()! */ function getLog() { return $this->lastLog; } /** * BOOL $proxy = detect( VOID ) * Start detection and return true if a proxy server is detected... */ function detect() { $log = ""; //scan all headers foreach ($this->scan_headers as $i) { //proxy detected? lets log... if ($_SERVER[$i]) $log.= "trigger $i: " . $_SERVER[$i] . "\n"; } //let's do something... if ($log) { $log = $this->lastLog = date("Y-m-d H:i:s") . "\nDetected proxy server: " . gethostbyaddr($_SERVER['REMOTE_ADDR']) . " ({$_SERVER['REMOTE_ADDR']})\n" . $log; //write to file $f = $this->getConfig('LOG_FILE'); if ($f) { if (is_writable($f)) { $fp = fopen($f, 'a'); fwrite($fp, "$log\n"); fclose($fp); } else { die("Fatal Error: Couldn't write to file: '$f'
Please check if the path exists and is writable for the webserver or php..."); } } //done return true; } //nope, no proxy was logged... return false; } }

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