# $Id: HeloRawLiteral.pm,v 1.4 2004/02/26 19:24:52 tvierling Exp $
#
# Copyright (c) 2002-2004 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.
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# 2. Redistributions in binary form must reproduce the above copyright
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# documentation and/or other materials provided with the distribution.
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# 3. Neither the name of the author nor the names of contributors may be used
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package Mail::Milter::Module::HeloRawLiteral;

use 5.006;
use base Exporter;
use base Mail::Milter::Object;

use strict;
use warnings;

use Sendmail::Milter 0.18; # get needed constants

our $VERSION = '0.03';

=pod

=head1 NAME

Mail::Milter::Module::HeloRawLiteral - milter to check for an IP literal without brackets in HELO

=head1 SYNOPSIS

    use Mail::Milter::Module::HeloRawLiteral;

    my $milter = new Mail::Milter::Module::HeloRawLiteral();

    my $milter2 = &HeloRawLiteral; # convenience

=head1 DESCRIPTION

RFC2821:4.1.3 specifies that raw IP addresses may be used in HELO, but
only if they are enclosed in [square brackets].  Spam engines sometimes
forget the brackets, so this milter will catch them.

=cut

our @EXPORT = qw(&HeloRawLiteral);

sub HeloRawLiteral {
	new Mail::Milter::Module::HeloRawLiteral(@_);
}

sub helo_callback {
	shift; # $this
	my $ctx = shift;
	my $helo = shift;

	if ($helo =~ /^([\d\.]+|[^\[].*:.*[^\]])$/) {
		$ctx->setreply("554", "5.7.1", "HELO/EHLO $helo: command rejected: raw IP literal not in [square brackets], required by RFC2821:4.1.3");
		return SMFIS_REJECT;
	}

	SMFIS_ACCEPT;
}

1;
__END__

=head1 AUTHOR

Todd Vierling, E<lt>tv@duh.orgE<gt> E<lt>tv@pobox.comE<gt>

=head1 SEE ALSO

L<Mail::Milter::Object>

=cut