Detecting Proxies

[driz]

Hi, I've been playing with this code, that gets the users REAL ip address:

<?php	function getRealIpAddr() {		if (!empty($_SERVER['HTTP_CLIENT_IP'])) { //check ip from share internet			$ip=$_SERVER['HTTP_CLIENT_IP'];		}		elseif (!empty($_SERVER['HTTP_X_FORWARDED_FOR'])) { //to check ip is pass from proxy			$ip=$_SERVER['HTTP_X_FORWARDED_FOR'];		}		else {			$ip=$_SERVER['REMOTE_ADDR'];		}		return $ip;	}?>

How can I edit this code so that IF the user is using a proxy I can show an error message such as 'Not allowed to access this page using Proxies' and if they are just using a normal everyday ip then no error will occur. I'm guessing I just replace the $ip variables with my message. But I want an efficient way of doing this, such as showing a whole page BUT not redirecting just showing the error page instead, like what happens if you get a 404, you dont redirect rather you just get the error page on that the problomatic URL. Thanks.

[justsomeguy]

If the proxy IP is given then you can just print an error message and exit right there. Is there a reason you need to save the error message to print it later?

[Synook]

Or you could send a 400-series header, but you have to do that before output.

[driz]

Or you could send a 400-series header, but you have to do that before output.

Could you explain this further please, as I don't know how you'd do that. thanks

[Synook]

header("HTTP/1.0 403 Forbidden");

That will send a 403 Forbidden header.