Missing Decoders

[Scott Kitterman]

On Sunday, March 27, 2011 12:04:31 pm Gary V wrote:
> On 3/27/11, Carlos Mennens <carlos.mennens at gmail.com> wrote:
> > Last night I stood up a new server running Debian Linux 6.0 (i386),
> > Amavisd-new 2.6.4-3, Postfix 2.7, & Clamav 0.97. Now that I have
> > Amavisd-new running with all the other applications, I show multiple
> > 'Amavis' notifications in /var/log/mail.log:
> > 
> > Mar 26 17:00:00 mail amavis[1020]: Found decoder for    .Z    at
> > /bin/uncompress
> > Mar 26 17:00:00 mail amavis[1020]: Internal decoder for .gz
> > Mar 26 17:00:00 mail amavis[1020]: Found decoder for    .bz2  at
> > /bin/bzip2 -d
> > Mar 26 17:00:00 mail amavis[1020]: No decoder for       .lzo  tried: lzop
> > -d Mar 26 17:00:00 mail amavis[1020]: No decoder for       .rpm  tried:
> > rpm2cpio.pl, rpm2cpio
> > Mar 26 17:00:00 mail amavis[1020]: Found decoder for    .cpio at
> > /usr/bin/pax
> > Mar 26 17:00:00 mail amavis[1020]: Found decoder for    .tar  at
> > /usr/bin/pax
> > Mar 26 17:00:00 mail amavis[1020]: Found decoder for    .deb  at
> > /usr/bin/ar Mar 26 17:00:00 mail amavis[1020]: Internal decoder for .zip
> > Mar 26 17:00:00 mail amavis[1020]: No decoder for       .7z   tried:
> > 7zr, 7za, 7z
> > Mar 26 17:00:00 mail amavis[1020]: No decoder for       .rar  tried:
> > unrar-free
> > Mar 26 17:00:00 mail amavis[1020]: No decoder for       .arj  tried: arj,
> > unarj
> > Mar 26 17:00:00 mail amavis[1020]: No decoder for       .arc  tried:
> > nomarch, arc
> > Mar 26 17:00:00 mail amavis[1020]: Found decoder for    .zoo  at
> > /usr/bin/zoo
> > Mar 26 17:00:00 mail amavis[1020]: No decoder for       .lha
> > Mar 26 17:00:00 mail amavis[1020]: No decoder for       .doc  tried:
> > ripole Mar 26 17:00:00 mail amavis[1020]: No decoder for       .cab 
> > tried: cabextract
> > Mar 26 17:00:00 mail amavis[1020]: No decoder for       .tnef
> > Mar 26 17:00:00 mail amavis[1020]: Internal decoder for .tnef
> > Mar 26 17:00:00 mail amavis[1020]: No decoder for       .exe  tried:
> > unrar-free; arj, unarj
> > Mar 26 17:00:00 mail amavis[1020]: Using primary internal av scanner
> > code for ClamAV-clamd
> > Mar 26 17:00:00 mail amavis[1020]: Found secondary av scanner
> > ClamAV-clamscan at /usr/bin/clamscan
> > Mar 26 17:00:00 mail amavis[1020]: Creating db in /var/lib/amavis/db/;
> > BerkeleyDB 0.42, libdb 4.8
> > 
> > I guess that I'm missing some packages but I don't know how to resolve
> > these issues in Debian. Does anyone know if there are packages which
> > specifically will satisfy the dependencies of Amavisd-new &
> > Clamav-daemon? If anyone knows what specifically I need in Debian to
> > satisfy these missing decoders, please let me know.
> > 
> > Thank you!
> 
> in /etc/apt/sources.list add non-free to:
> deb http://ftp.us.debian.org/debian/ squeeze main non-free
> 
> and:
> deb http://security.debian.org/ squeeze/updates main non-free
> 
> Then:
> apt-get update
> apt-get install arj lha p7zip rpm unrar-free cabextract unrar-free
> 
> Personally I would not worry about ripole.

A good was to discover such things is to look at what the package maintainer 
suggests be installed (these are not installed by default, since not everyone 
will want them).  An easy way to access this is:

$ apt-cache show amavisd-new|grep Suggests

If you are concerned about RAR files, you will probably want the non-free 
unrar as unrar-free only supports very old, seldom used RAR variants (you will 
need to enable non-free on Debian to get this).

Scott K