Great Circle Associates Firewalls
(November 1995)
 

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Subject: Re: Generic Proxy
From: jim howard <jhoward @ lyceum . com>
Date: Tue, 7 Nov 1995 11:23:53 -0500 (EST)
To: mikew @ smartpt . demon . co . uk
Cc: firewalls @ greatcircle . com, fwtk-users @ tis . com
In-reply-to: <199511071454 . JAA17593 @ zeus . lyceum . com> from "lcrawley @ lyceum . com>" at Nov 7, 95 09:54:26 am
Reply-to: firewalls @ greatcircle . com, fwtk-users @ tis . com

> Does anybody know of a generic tcp/udp proxy which does not suffer
> from the limitations of the likes of plug-gw (no slight intended),
> i.e. will support one-to-many connections to the same destination
> port?

I have built from the TIS plug-gw, a "multiplug" that
listens on a single port number and a single ip address. (tcp only)
The key is that it runs stand-alone and not from inetd.

By using multiple instances of this "multiplug" I can
listen on the same port in much the same way as a virtual WWW server,
and perform a different task based on which address I'm listening for.

I'm sure there are probably better ways of doing this,
like a stand-alone process listening on the generic (0.0.0.0) address
that extracts the connection information from the socket,
but I didn't have a lot of time to put research into it.

The code is very rough, about a days work for an emergency "plug".
If there is enough interest, I can clean it up and send it back over 
to TIS (after all, it was their code I built it from.)

Jim Howard
Network Engineer
Lyceum Internet


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