Hi there,
I'm currently trying to figure out how the whole libnetfilter_conntrack
works, and more precisely the expect part of the lib.
My aim is to be able to create new expectation entries with this lib in
an application that would inspect packets (either coming from a
pcap-based sniffer or from netfilter via the nfqueue mechanism) : thus
I'd like to allow connections related to the inspected (and already
allowed) connections.
My various tests make me think that to create such an expectation entry,
a kernel module related to the master connection is required: am I right?
For instance, the "expect_create" app in the libnetfilter_conntrack
"utils" subdirectory works fine, unless I modify the destination port of
the master conntrack structure... then it's no longer related to the FTP
conntrack mechanism...
Same thing happens when using the conntrack app. from the conntrack-tools.
So, I'd like to know how to do this the right way, without coding the
whole inspection thing in a kernel module (if this is possible). Is
there any generic tcp conntrack system that could help here?
As I'm not too sure to fully understand the whole mechanism of expected
connection creation, any hint is welcome!
I hope this is not too confused... Thanks,
--
V.
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