Paul wrote:
Hi

I have been looking at using the -z option on either clamdscan or clamscan and stumbled onto some odd behavior.

This is with version 101.1. 101.0 also behaves the same.


Take 2 paultest-010E110713-000 is constructed from test/clam.mail with the addition of a line of text to the text/plain part of clam.mail which triggers SecuriteInfo.com.Spam-48198.UNOFFICIAL FOUND

paule@larch:~# clamscan  -z /var/lib/quarantine/paultest-010E110713-000
/var/lib/quarantine/paultest-010E110713-000: Clamav.Test.File-6 FOUND
/var/lib/quarantine/paultest-010E110713-000: SecuriteInfo.com.Spam-48198.UNOFFICIAL FOUND
/var/lib/quarantine/paultest-010E110713-000: Clamav.Test.File-6 FOUND
/var/lib/quarantine/paultest-010E110713-000: SecuriteInfo.com.Spam-48198.UNOFFICIAL FOUND


Anyway to prevent the duplicate signature hits being displayed.

       -z, --allmatch
After a match, continue scanning within the file for additional matches.

.... don't use -z? There's no way I know of to specify which signature takes precedence during a single scan, so if you're continuing after you've found a match, I would call it reasonable that you also want to know all of the signatures that matched. If you only want to report one signature, then continuing to scan the file seems to be a waste.

If you want to separately report hits from subsets of signatures, you'll probably need to store them in different directories, and use the -d option:

       -d FILE/DIR, --database=FILE/DIR
Load virus database from FILE or load all virus database files from DIR.

to run multiple, independent scans with each subset of signatures. This way you can pick which set to check in which order, and skip further processing as desired based on the results.

-kgd
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