SV: filtering file types vs. extensions
Anders Andersson, IT
andersan at LTKALMAR.SE
Mon Jun 23 12:12:26 IST 2003
> -----Ursprungligt meddelande-----
> Från: Julian Field [mailto:mailscanner at ECS.SOTON.AC.UK]
> Skickat: den 23 juni 2003 11:27
> Till: MAILSCANNER at JISCMAIL.AC.UK
> Ämne: Re: filtering file types vs. extensions
> At 23:21 22/06/2003, you wrote:
> >On Fri, 2003-06-06 at 14:16, Julian Field wrote:
> > > Not a good start.
> > > The latest File::MMagic module does not understand Linux
> > > /usr/share/magic files. It complains a lot about them,
> which makes
> > > it useless. So I will have to use the "file" command,
> with a timeout
> > > and all that c**p to stop DoS attacks on the file command.
> > >
> > > Does everyone's "file" command output the filename
> followed by a ":"
> > > followed by 1 or more spaces followed by the file type?
> >Just wondered how this ended up going. Did it prove more
> trouble than
> >it's worth?
> I haven't done much more on this. I need to play around with
> the file command on a bunch of different OS's to see if the
> output format is vaguely consistent. If so, then it is
> possible and I'll take another look at this. Bear in mind
> that it will take noticeable CPU to do it, as it involves a
> "file" command for each batch of messages. Cheap compared to
> spam detection though.
Even if file wont be the best soultion in the world I know I would be glad
such a option in mailscanner..... thats always what my boss complains about
when he's been talking to Antigen :)
> Julian Field
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