Attach mac address to username

[Shane]

I have built a small hotspot at a hotel and have sucessfully found out 
all I needed by STF & STW so far. I must be using the wrong search 
phrases as I haven't come accross anything like what I am trying to do.
Currently using freeradius 1.0.1 with chillispot on my nas with the 
following attributes in the mysql database.
Simultaneous-Use
Max-All-Session
Idle-Timeout

I would like to provide username/password combinations that allow 24 
hour access only to the original mac address that sucessfully logged in.

Is there a way to dynamically attach the mac of the users pc to the 
username who has logged in?
This way I can stop people sharing the same username/password 
combination on different pc's.

Is thas possible?
Thanks
Shane
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