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<H2><A NAME="SECTION00044000000000000000">
Archives and compressed files</A>
</H2>
All ClamAV scanners depend on LibClamAV. It has a built-in support for the
following formats:
<UL>
<LI>Zip
</LI>
<LI>Gzip
</LI>
<LI>Bzip2
</LI>
<LI>RAR (2.0 only)
</LI>
</UL>
Archive types are determined by magic number tests.<A NAME="tex2html76"
HREF="footnode.html#foot411"><SUP>5</SUP></A> You need the zlib library
for the Zip/Gzip support. Zip archives are accessed with the zziplib
library by Guido Draheim and Tomi Ollila. RAR support is based on the
UniquE RAR File Library by Christian Scheurer and Johannes Winkelmann.
Both of them are included and slightly modified in the clamav sources.
Unrarlib supports RAR 2.0 archives only and according to Christian
the new format (introduced in WinRAR 3.0) will never be supported
(however clamscan can scan WinRAR 3.0 archives, see below). Due to
security reasons clamd only scans archives supported by libclamav and
can't use external programs. Clamscan is more clever and can switch to
the external unpacker when the built-in decompresor fails:
<PRE>
$ clamscan --unrar test-failure.rar
/home/zolw/Clam/test/test-failure.rar: RAR module failure.
UNRAR 3.00 freeware Copyright (c) 1993-2002 Eugene Roshal
Extracting from /home/zolw/Clam/test/test-failure.rar
Extracting test1 OK
All OK
/tmp/44694f5b2665d2f4/test1: ClamAV-Test-Signature FOUND
/home/zolw/Clam/test/test-failure.rar: Infected Archive FOUND
</PRE>
<I><B>TIP:</B> You can force clamscan to list all infected files
in archive using -disable-archive (it disables the built-in
transparent decompressors) and -unzip -unrar...</I>.
<BR> <B>If the scanner runs on a superuser level unpackers are
executed with <I>clamav</I> privileges what makes the process far more
secure.</B> It also assures the <I>clamav</I> user has read access
to all files. <B>You must enable recursive scanning with the -r
option (-recursive) in order to scan a whole content of an
archive (including subdirectories)</B>, this option is also (usually) required
to scan nested archive. External unpackers supported:
<BR>
<P>
<B>-unzip: </B> Usually you don't need this option because Zip format is
supported by libclamav. However it may be useful if libclamav
fails to unzip some file. clamscan was tested with
<I>UnZip 5.41 of 16 April 2000, by Info-ZIP</I>.
<BR> <B>-unrar: </B> Tested with <I>UNRAR 3.00 freeware</I>.
<BR> <B>-arj: </B> Tested with <I>arj 3.10b</I>.
<BR> <B>-zoo: </B> Tested with <I>zoo 2.1</I>.
<BR> <B>-lha: </B> Tested with <I>LHa for Unix V 1.14e</I>.
<BR> <B>-jar: </B> clamscan uses <I>unzip</I> for .jar files. Tested with
<I>UnZip 5.41 of 16 April 2000, by Info-ZIP</I>.
<BR> <B>-tar: </B> This option enables support for non-compressed archives. Tested
with <I>GNU tar 1.13.17</I>.
<BR> <B>-deb: </B> This option enables support for debian binary packages. Tested with
<I>GNU ar
<BR>
2.12.90.0.14</I>. Implies -tgz , but doesn't
conflict with -tgz=FULLPATH
<BR> <B>-tgz: </B> This option supports .tar.gz and .tgz files. You need <I>GNU
tar</I>, on non-Linux system you probably have it installed as
<I>gtar</I> and if it can be found in <I>$PATH</I> please use
-tgz=gtar to tell clamscan to use <I>gtar</I> instead of
<I>tar</I>. Otherwise please supply a full path with -tgz
<BR>
<P>
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<ADDRESS>
Tomasz Kojm
2004-06-14
</ADDRESS>
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