From mboxrd@z Thu Jan  1 00:00:00 1970
From: Pascal Hambourg <pascal.mail@plouf.fr.eu.org>
Subject: Re: Obtain original address from redirected connection
Date: Thu, 04 May 2006 20:51:24 +0200
Message-ID: <445A4D2C.1000001@plouf.fr.eu.org>
References: <20060502025450.73457687.pedro.werneck@terra.com.br>
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[Sorry for the late answer, I just subscribed to the list]

Hello,

Pedro Werneck wrote :
> 
> I have a daemon, a sort of proxy, written in Python, who receives
> redirected connections with a rule like this:
> 
> iptables -t nat -A PREROUTING -j DNAT -p TCP -s source --to-destination host:port
> 
> The problem is that I need access to the original destination address,

You can parse /proc/net/ip_conntrack on the NAT box, which contains the 
  list of the connections currently handled by conntrack/NAT. This is 
how Squid retrieves the original destination address when running in 
transparent mode.
Note : on "recent" kernels you need root privileges to read this file.