Displaying MAC address on Captive Portal login page?

[docwho76]

Is it possible to display the users MAC address on the CP login page? I have searched the forums and looked in the wiki and Googles a bunch and havent been able to find anything recent, or conclusive that helps.

Is there documentation anywhere of the different variables that can be used, like for example the:

Is there a REMOTE_MAC? What others are there? Thanks!

[docwho76]

Ok, answering my own question here. This is the code I added to my PHP login page to make it work

function returnmacAddress() {
// This code is under the GNU Public Licence
// Written by michael_stankiewicz {don't spam} at yahoo {no spam} dot com 
// Get the arp executable path
$location = `which arp`;
$location = rtrim($location);

// Execute the arp command and store the output in $arpTable
$arpTable = `$location -a`;

// Split the output so every line is an entry of the $arpSplitted array
$arpSplitted = split("\n",$arpTable);

// Get the remote ip address (the ip address of the client, the browser)
$remoteIp = $GLOBALS['REMOTE_ADDR'];
$remoteIp = str_replace(".", "\\.", $remoteIp);

// Cycle the array to find the match with the remote ip address
foreach ($arpSplitted as $value) {
	// Split every arp line, this is done in case the format of the arp
	// command output is a bit different than expected
	$valueSplitted = split(" ",$value);
	foreach ($valueSplitted as $spLine) {
		if (preg_match("/$remoteIp/",$spLine)) {
		$ipFound = true;
		}
		// The ip address has been found, now rescan all the string
		// to get the mac address
		if ($ipFound) {
			// Rescan all the string, in case the mac address, in the string
			// returned by arp, comes before the ip address
			// (you know, Murphy's laws)
			reset($valueSplitted);
			foreach ($valueSplitted as $spLine) {
				if (preg_match("/[0-9a-f][0-9a-f][:-]"."[0-9a-f][0-9a-f][:-]"."[0-9a-f][0-9a-f][:-]"."[0-9a-f][0-9a-f][:-]"."[0-9a-f][0-9a-f][:-]"."[0-9a-f][0-9a-f]/i",$spLine)) {
					return $spLine;
				}
			}
		}
		$ipFound = false;
	}
}
return false;
}
?>

And then where I want to display the MAC address we put: