Updating several amchine behind a fireall?

[stan]

I find myself in the unfortunate position of supporting 10+ FreebSD machine
that live behind a _VERY_ restrictive firewall that I have no control over.
The only thing I can get through the firewall is http (using a FreebSD
machine with squid as a SOCKS proxy).

Over time these machine have gotten quite out of date, and I need to update
them. Any suggestions to how to do this? A cvsup mirror? If so, how can I
get it's files? Copying /usr/src from a laptop that I cvsup from home?



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