[clamav-users] PrivateMirror set on client machine. Disable cld downloads

Arjen de Korte build+clamav at de-korte.org
Mon Mar 23 16:35:20 EDT 2020

Citeren "Scott A. Wozny via clamav-users" <clamav-users at lists.clamav.net>:

> One caveat with that suggestion is that if you move off of freshclam  
> to do your signature retrieval with wget, you give up the  
> efficiencies of just downloading the first 512 bytes of each DB file  
> to see if it's been updated and, if not, going back to sleep until  
> the next check.  Using wget you go from a few KB of bandwidth per  
> server per check to hundreds of MB for each update on each server.   
> If you don't care about bandwidth and disk I/O, then this difference  
> won't matter to you, but if it does, just be aware of the difference.

The --timestamping option of wget will fix that for you and will only
download the file if the timestamp of the remote file changes:

     wget --timestamping http://database.clamav.net/daily.cvd

> Alternatively, you could emulate what freshclam does and curl the  
> first 512 bytes, do the comparative version checking and then  
> sleeping or doing the full download.  But once you get to that  
> point, you're practically rewriting freshclam and then the option of  
> reaching out to the devel list to modify freshclam to fit your needs  
> for a custom build starts to become a comparable amount of work.
> Scott
> ________________________________
> From: clamav-users <clamav-users-bounces at lists.clamav.net> on behalf  
> of G.W. Haywood via clamav-users <clamav-users at lists.clamav.net>
> Sent: March 23, 2020 12:32 PM
> To: ClamAV users ML <clamav-users at lists.clamav.net>
> Cc: G.W. Haywood <clamav at jubileegroup.co.uk>
> Subject: Re: [clamav-users] PrivateMirror set on client machine.  
> Disable cld downloads
> Hi there,
> On Mon, 23 Mar 2020, vin9999 via clamav-users wrote:
>> ... how can we disable .cld downloads? ...
> Use something else to download the files?
> Presumably you use freshclam to keep the private mirror up to date,
> but there is nothing which forces you to use freshclam to copy files
> from the private mirror to its clients.  A utility like 'wget' could
> do what you need.
> --
> 73,
> Ged.
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