Re: POP forwarding

[Amos Shapira <amos@dsi.co.il>]

In message <[🔎] 199606152238.QAA28309@galileo.cuug.ab.ca> you write:
|Kai Grossjohann said:
|> 
|> >>>>> "Douglas" == Douglas Bates <dbates@stats.adelaide.edu.au> writes:
|> 
|>     Douglas> However, my Debian Linux machine can reach outside the
|>     Douglas> firewall and access their home server for them.
|> 
|> I think it would not be too difficult to write a POP proxy.  You write
|> a little program that runs on your Debian box that pretends to be a
|> POP server, but what it really does is to open a connection to the
|> *real* POP server of your friends and forward all commands to that
|> server.
|
|There is a little program which comes with INN which can do this
|(backends/rcompress.c). It can be altered to forward connections to any server
|on any port. I've used it to forward NNTP connections past a firewall, using
|tcp_wrapper in inetd to control access.

My first though went for SOCKS.  Thought I never got around to use it,
from what I saw it looks like this is an Internet standard for doing
generic application-level proxying.

In any case, make sure that wnatever you install on the firewall
doesn't let outsiders to connect back in.

Cheers,

--Amos

--Amos Shapira                    | "Of course Australia was marked for
133 Shlomo Ben-Yosef st.          |  glory, for its people had been chosen
Jerusalem 93 805                  |  by the finest judges in England."
ISRAEL             amos@dsi.co.il |                     -- Anonymous