*
* 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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