On 2011 Feb 23, at 21:12 , David F. Skoll wrote:
> On Wed, 23 Feb 2011 14:15:17 -0500
> James Ralston <[email protected]> wrote:
>
>> David, do you have any opinion on this? Would you be willing to
>> accept patches in order to enable mimedefang to be invoked as a milter
>> multiple times? Or are you in the "just run another instance of
>> mimedefang" camp?
>
> I'm not too enthusiastic about this. I really can't see the use-case
> for multiple milters. It seems to me it's easier and more flexible
> to do everything (greylisting, DKIM verification, etc.) in Perl. It
> gives you one place to write policy. The "next generation" Sendmail
> (MeTA1) makes it official: It only support one pmilter and says you
> need a multiplexor on your end to support multiple pmilters. [I'm not
> sure that MeTA1 will ever see the light of day as production software...]
It would probably be Very Cool if mimedefang could have hooks to use
Net::Milter to be able to directly link to other milters, from within
mimedefang.pl. Something like:
sub filter_initialize {
md_add_external_milter( name => 'dkim',
location => 'inet:8891@localhost',
default_call => 'before', # dkim milter is always
called before mimedefang.pl routines
);
md_add_external_milter( name => 'grey',
location =>
'local:/var/milter-greylist/milter-greylist.sock',
default_call => 'after', # dkim milter is called
after mimedefang.pl routines (unless called manually)
);
}
my %greylist_passed_hosts;
sub filter_recipient {
my ($recipient, $sender, $ip, $hostname, $first, $helo,
$rcpt_mailer, $rcpt_host, $rcpt_addr) = @_;
# ...
if ( !$greylist_passed_hosts{$ip} ) {
my $grey_answer = md_invoke_milter('grey');
if ( $grey_answer->disposition() eq 'accept' ) {
$greylist_passed_hosts{$ip} = time;
}
md_process_milter_response($grey_answer); # also adds filters if
necessary
}
}
__END__
... but... that requires quite a bit of work, especially if the insides of
Net::Milter are wrapped up like this. But it could be really useful, and make
it very easy to integrate mimedefang with additional milters, allowing
mimedefang to even control the behaviour of the other milter.
--
Jan-Pieter Cornet <[email protected]>
"People are continuously reinventing the flat tyre".
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