help with MAC logging patch

[Charles Flynn <charles@xxxxxxxx>]

Hello,

I'm working on a project that needs to identify clients by MAC  
address. For this project, we can assume that squid will sit on the  
same subnet as the clients. I've looked through the mail archives and  
have seen the question about logging MACs asked several times, but  
there seems to be no patch available to make it happen. Does anyone  
know if a patch exists? If not, I'm interested in writing such a  
patch, and would very much like to get any tips, suggestions etc to  
help me get started.

Thanks,
Charles