Re: filtering .mp3 packets

["John T. Williams" <jtwilliams@vt.edu>]

I don't know mp3 format, but surely they all have a header that is
identifiable?  I mean where they store information about the mp3 such as
speed and title and such.  Surely you could id an mp3 from that information.
and terminate the stream.


----- Original Message ----- 
From: "J." <mailing-lists@xs4all.nl>
To: <linux-newbie@vger.kernel.org>
Sent: Wednesday, April 27, 2005 3:51 PM
Subject: Re: filtering .mp3 packets


> On Wed, 27 Apr 2005, simon wrote:
> > hello Bill
> >
> > >>We've been having some difficulty finding the vocabulary to describe
> > >>filtering content (for example .mp3 files) over TCP-IP. We would like
to
> > >>set up our Linux server to do some "trapping" of packets containing
.mp3
> > >>files with an eye toward using Linux enabled routing to clean our
campus
> > >>of an overwhelming dose of music downloads and trading. To do this
> > >>exploration, I need to know what I should call the process I'm trying
to
> > >>perform. Any vocabulary that you can suggest?
> > >>
> > >>Bill Stanard
> >
> > may be you can write a kernel module using the netfilter to perform
that...
> > netfilter is a very powerful way to build every kind of filter.
> > you can find some informations here :
> > http://www.ouah.org/p61-0x0d_Hacking_the_Linux_Kernel_Network_Stack.txt
> >
> > regards
> >
> > simon
> Wednesday, April 27 21:36:30
>
> Problem is not catching the actual TCP packets, but classifying them like:
> This TCP packet is 100% sure, a packet that contains a piece of mp3 data .
>
> Try to encode a mp3 file, split it into very tiny chunks, remove all but
> one, and see if you can guess if it's a mp3 file..
>
> There is also encryption to deal with, terrible implemented TCP stacks in
> cheap modems and routers when trying to reassemble a whole stream,
> disecting, guessing different protocols and levels.. It's definitively
> a challenge so to speak..
>
> J.
>
> -- 
> Don't worry Ma'am. We're university students, - we know what we're doing.
>
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