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FW: a filter for tcp socket

Did you hear about netfilter/iptables/ipchains etc?
This is a firewall task, isn't it?
And there are tons of documentation - visit "netfilter.samba.org".
Or google :).

-----Original Message-----
From: Samu [mailto:samu@linuxasylum.net]
Sent: Monday, September 03, 2001 9:04 PM
To: debian-security@lists.debian.org
Subject: a filter for tcp socket

this is a work i would like to study but i fall in problem when looking for
Linux Socket Filtering Documentation.
I want to make a filter that can alterate data on tcp packets following
some  rules ( e.g. faking icq messages to give you an idea ) and must block
the original packet (or rewrite it ... aniway it's IMPORTANT the original
packet can't arrive to destination) .
this filter has to run on a machine in which traffic pass through
( e.g. a linux gw on a LAN ) .
the only way i find to do that ( attach a program that filter sockets)
is through Linux Socket Filtering but it seem not to be any docs about that.
is there someone who has links to docs, examples or can suggest me another
to do that ?


Samuele Tonon  <samu@linuxasylum.net>
Undergraduate Student  of  Computer Science at  University of Bologna, Italy
System administrator at Computer Science Lab's, University of Bologna, Italy
Founder & Member of A.A.H.T.
UIN 3155609
          	Acid -- better living through chemistry.
			       Timothy Leary

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