sending event to user space

sending event to user space

[pablo neira]

Hi list!

I programmed a dummy module for netfilter which tries to match a packet 
and if it does, it will do nothing (NF_ACCEPT) but I would want it to 
send an event to a program in user space to do something, how can I do that?

So something like:

a) packet gets my hook and do NF_ACCEPT.
b) modules sends an event to user space.
c) program in user space does something.

Thanks!
Pablo

P.S: thanks for this great piece of code!!

Re: sending event to user space

[Harald Welte]

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On Wed, Dec 03, 2003 at 03:23:17PM +0100, pablo neira wrote:
> Hi list!
> 
> I programmed a dummy module for netfilter which tries to match a packet 
> and if it does, it will do nothing (NF_ACCEPT) but I would want it to 
> send an event to a program in user space to do something, how can I do that?

That is not really netfilter related at all.  You could create a /proc
file and write something to it, you could use netlink sockets, you could
use any means that the kernel provides for communication with userspace
processes...
 
> Thanks!
> Pablo

-- 
- Harald Welte <laforge@netfilter.org>             http://www.netfilter.org/
============================================================================
  "Fragmentation is like classful addressing -- an interesting early
   architectural error that shows how much experimentation was going
   on while IP was being designed."                    -- Paul Vixie

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