[Mimedefang] Cascading virus scanners

[David F. Skoll]

On Thu, 19 Sep 2002, Aaron Paetznick wrote:

> What if I wanted paranoid-level virus scanning?  Could I run several 
> different virus scanners in series?  Would the following be the most 
> efficient method?

> sub message_contains_virus () {
>    if (message_contains_virus_filescan()) {
>      return message_contains_virus_filescan();
>    } elsif (message_contains_virus_clamav()) {
>      return message_contains_virus_clamav();
>    } else {
>      return (wantarray ? (0, 'ok', 'ok') : 0);
>    }
> }

No.

You want:

sub message_contains_virus () {
	my($code, $cat, $act);

	($code, $cat, $act) = message_contains_virus_filescan();
	return (wantarray ? ($code, $cat, $act) : $code) if ($act ne "ok");

	($code, $cat, $act) = message_contains_virus_clamav();
	return (wantarray ? ($code, $cat, $act) : $code) if ($act ne "ok");

	# etc...
}

> This allows me to optimize the stack and make my prefered scanner come 
> first, but I'm efectively calling the scan twice to do this.  There has 
> to be a better way...
> 
> Opinions?
> 
> 
> --Aaron
> 
> 
> 
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