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# $Id: MailBogusNull.pm,v 1.2 2006/03/22 15:48:23 tvierling Exp $
#
# Copyright (c) 2006 Todd Vierling <tv@pobox.com> <tv@duh.org>
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are met:
#
# 1. Redistributions of source code must retain the above copyright notice,
# this list of conditions and the following disclaimer.
#
# 2. Redistributions in binary form must reproduce the above copyright
# notice, this list of conditions and the following disclaimer in the
# documentation and/or other materials provided with the distribution.
#
# 3. Neither the name of the author nor the names of contributors may be used
# to endorse or promote products derived from this software without specific
# prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
# ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
# LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
# CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
# POSSIBILITY OF SUCH DAMAGE.
package Mail::Milter::Module::MailBogusNull;
use 5.006;
use base Exporter;
use base Mail::Milter::Object;
use strict;
use warnings;
use Carp;
use Sendmail::Milter 0.18; # get needed constants
use Socket;
use UNIVERSAL;
our $VERSION = '0.01';
=pod
=head1 NAME
Mail::Milter::Module::MailBogusNull - milter to reject null-sender mail to multiple recipients
=head1 SYNOPSIS
use Mail::Milter::Module::MailBogusNull;
my $milter = new Mail::Milter::Module::MailBogusNull;
my $milter2 = &MailBogusNull; # convenience
$milter2->set_message('Null sender mail should go to only one recipient');
=head1 DESCRIPTION
This milter module rejects any mail from a C<null sender> (empty
C<E<lt>E<gt>> address) which attempts to deliver to multiple recipients.
Normal delivery status notifications are intended for a single message, and
thus should only ever be addressed to a single recipient.
=head1 METHODS
=over 4
=cut
our @EXPORT = qw(&MailBogusNull);
sub MailBogusNull {
new Mail::Milter::Module::MailBogusNull(@_);
}
=pod
=item new()
Creates a MailBogusNull object. There are no arguments to configure this
module, as it is a fixed check.
=cut
sub new ($) {
my $this = Mail::Milter::Object::new(shift);
$this->{_ignoretempfail} = 0;
$this->{_message} = 'Sender <> delivery status notifications cannot be addressed to more than one recipient';
$this;
}
=pod
=item set_message(MESSAGE)
Sets the message used when rejecting messages.
This method returns a reference to the object itself, allowing this method
call to be chained.
=cut
sub set_message ($$) {
my $this = shift;
$this->{_message} = shift;
$this;
}
sub envfrom_callback {
my $this = shift;
my $ctx = shift;
if (shift ne '<>') {
$ctx->setpriv(undef);
return SMFIS_ACCEPT;
}
$ctx->setpriv(0);
SMFIS_CONTINUE;
}
sub envrcpt_callback {
my $this = shift;
my $ctx = shift;
my $nullcount = $ctx->getpriv;
$ctx->setpriv(++$nullcount);
if ($nullcount > 1) {
$ctx->setreply(554, '5.7.0', $this->{_message});
return SMFIS_REJECT;
}
SMFIS_CONTINUE;
}
sub eoh_callback {
my $this = shift;
my $ctx = shift;
if ($ctx->getpriv() > 1) {
$ctx->setreply(554, '5.7.0', $this->{_message});
return SMFIS_REJECT;
}
SMFIS_ACCEPT;
}
1;
__END__
=back
=head1 AUTHOR
Todd Vierling, E<lt>tv@duh.orgE<gt> E<lt>tv@pobox.comE<gt>
=head1 SEE ALSO
L<Mail::Milter::Object>
=cut
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