conntrack: Connection close event?

["Cedrix" <netfilter@cedrix.com>]

Hi,

this is my first request. I checked google, nf-faqs and conntrack-homepage 
without sufficient results for this problem:

In Short: I need to know when a connection (TCP or UDP) gets closed. I want 
to use conntrack, because I can track UDP more easily.

My thoughts so far: The /proc/net/ip_conntrack reacts very quick when a 
close happens, but it's not conveniant to check in my C/C++ application. So, 
in further reading I 've seen in the source some kind of "event-handling". 
(Listening Event for new connection, etc.)

My question: What's the best method to see if a connection gets closed. 
(Also, connection opened).

Btw: I use iptables -I FORWARD -m -state --NEW -m --LOG -log-prefix "New 
Connection established: " to log established connections, so it would be 
nice (but not necessary) if I can use the LOG for closing-connections, too - 
OR alternatively - use a conntrack-event for detecting NEW connections, too.

Any help or comment is appreciated! Thanks.


Cedrix.



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