David,
> Is there a way to configure Amavisd-new so that big mails (for example
> bigger as 10 MB) do not get virus-scanned? If not, is it possible to
> implement it with a custom hook?
Not configurable, but can be done through a custom hook.
I just realized the most elegant way to do it would be
to load a policy bank in a custom hook - but it needs
a small patch to 2.6.0-pre3 (below), which will find
its way into the release.
Put this into amavisd.conf:
$policy_bank{'NOVIRUSCHECK'} = {
bypass_decode_parts => 1,
bypass_virus_checks_maps => [1],
};
Then, in a custom hook initialization routine ('new'),
load this policy bank when desired, e.g.:
sub new {
my($class,$conn,$msginfo) = @_;
my($self) = bless {}, $class;
if ($msginfo->msg_size > 10*1024*1024) {
Amavis::load_policy_bank('NOVIRUSCHECK');
do_log(2, "skipping virus checks, size=%d bytes", $msginfo->msg_size);
}
$self;
}
Other custom hook routines are not needed and may be
left undefined (actually, their dummy default routines kept).
Here is the patch needed for 2.6.0-pre3 to ensure a reset
of policy banks, as otherwise the change of a policy bank
by a custom hook will be unnoticed and the setting kept
for the subsequent message:
--- amavisd.orig Sun Dec 30 02:20:52 2007
+++ amavisd Wed Jan 9 20:42:58 2008
@@ -14205,7 +14205,5 @@
push(@response, proto_encode('exit_code',sprintf("%d",$exit_code)));
ll(2) && do_log(2, "mail checking ended: %s", join("\n",@response));
- if ($policy_changed) { # restore bank settings
- %current_policy_bank = %baseline_policy_bank; $policy_changed = 0;
- }
+ %current_policy_bank = %baseline_policy_bank; # restore bank settings
@response;
}
@@ -15087,6 +15085,5 @@
undef $sender_unq; undef $sender_quo; @recips = (); $got_rcpt = 0;
$max_recip_size_limit = undef; $msginfo = undef; # forget previous
- if ($policy_changed)
- { %current_policy_bank = %baseline_policy_bank; $policy_changed = 0 }
+ %current_policy_bank = %baseline_policy_bank; # restore bank settings
# report elapsed times by section for each transaction
# (the time for a QUIT remains unaccounted for)
Mark
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