Re: [Programming] kernel level grab packet

From: Michael Heiming (michael+USENET_at_www.heiming.de)
Date: 01/29/04 

Date: Thu, 29 Jan 2004 01:02:31 +0100

Shin <gelidmite@yahoo.com> wrote:
> Hi,
> I don't know if I used a good subject because I am not
> familiar with linux kernel programming. I heard it may
> meet my need from someone.
>
> I want to write a program which can filter (or just check)
> internet packets before other applications. It is like
> a guard which collects all internet traffic, even belonging
> to other application, and then pass the packet to where it is
> supposed to go (might be other high level application).
                                                                                 
> The main point is that these high level applications won't
> notice the guard's existence. I heard programming in kernel
> level can achieve this. After searching the internet, I found
> some materials, but they are not specific enough for my requirement.

What are your requirements? There is a state-full firewall built
into the Linux kernel, the user-space tool for setting up is
(2.4.x) 'iptables'. This sounds like what you want.
Hint
man iptables
                                                                                 
> I have "Linux Device Drivers, 2nd Edition By Alessandro Rubini &
> Jonathan Corbet". Still reading it. So far, didn't find things
> about what I mentioned above.
>
> Anyone knows good documents/toturial/material for me?

www.tlpd.org probably has some. 

-- 
Michael Heiming
Remove +SIGNS and www. if you expect an answer, sorry for 
inconvenience, but I get tons of SPAM

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