Re: Intercepting a packet, changing it and re-injecting into the network
- From: Eygene Ryabinkin <rea-fbsd@xxxxxxxxxxx>
- Date: Fri, 22 Dec 2006 19:08:13 +0300
Fabricio, good day!
I'm developing a network application which needs *to intercept* a packet
(not just *copy* a packet, like libpcap does), move this packet into my
application (userland), do some checking in the packet and according
with some heuristics, the application may change the payload and
re-inject the modified packet into the network. Note that sometimes,
I'll change the payload, drop the packet or just let it go.
So, how can a I do that in FreeBSD? I can use 6.1, 7.1, any version.
Probably you should read the divert(4) manual page and the ipfw(8)
manual, looking for the 'divert' directive. The good example of
your application is /sbin/natd.
The aforementioned facilities are present in FreeBSD at least since 4.x.
--
Eygene
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