Morgon J. Kanter wrote:
Hi,
I'm developing an application that uses libnetfilter_conntrack to note when
connections start and end as part of what it does. So far I've been able to do
just fine is use nfct_filter with nfct_catch and have a function called
whenever the appropriately filtered conntrack events happen. This works well,
but my program doesn't *just* look for conntrack events and act on them. To
keep it single-threaded what I'd like to do is just be able to poll for
conntrack events, with poll() or select() or whatever.
IRC, you can use nfct_fd() to get the netlink file descriptor.
What I attempted was extracting the netlink fd with the filter applied, and
running select() on a set containing just that, and then using nfct_query().
nfct_query() is not of any use to listen to events.
This didn't work at all though -- when filtered conntrack events do happen,
apparently nothing is pushed down that file descriptor. Is there any way to do
what I want? I didn't see anything that was using this sort of functionality
in the utils directory.
You can look at the conntrack-tools, specifically conntrackd, it does
more or less what you seem to need.
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