WIFI access software

[Jeff Seeman]

I have a client who has 3 restaurants and wants to provide wifi access 
to the customers. He wants to be able to control who and when it can be 
accessed. He is not planning on charging for the access at the moment 
but certainly would like that ability. I want to use freebsd, but can 
not find a software pkg that will allow me to do this. Does anyone have 
an idea or better yet implemented something like this?

Thanks in advance,

Jeff