When chillispot calls hotspotlogin.php or hotspotlogin.cgi it passes a few paramters through the URL. It appears to be the users device mac address, a challenge, the nasid and the userurl as well as a status.

I need to find this macaddress and put it into log, I have strictly logging requirement,  how make the log isn't a trouble but I don't know  recover or find the user's  mac address.

Any help is appreciated

Tnx Carlo