##    ntp.pm: Fwctl service module to handle the ntp protocol.##    This file is part of Fwctl.##    Author: Francis J. Lacoste <francis@iNsu.COM>##    Copyright (c) 1999,2000 iNsu Innovations Inc.##    This program is free software; you can redistribute it and/or modify#    it under the terms of the GNU General Public License as published by#    the Free Software Foundation; either version 2 of the License, or#    (at your option) any later version.#package Fwctl::Services::ntp;use strict;use Fwctl::RuleSet qw(:udp_rulesets :masq :ports);use IPChains;sub new {  my $proto = shift;  my $class = ref $proto || $proto;  bless {}, $class;}sub prototypes {  my ($self,$target,$options) = @_;  my $src_port = $options->{client} ? UNPRIVILEGED_PORTS : 'ntp';  # Build prototype rule  (   IPChains->new(		 Rule	    => $target,		 Prot	    => 'udp',		 SourcePort => $src_port,		 DestPort   => 'ntp',		 %{$options->{ipchains}},		),  );}sub block_rules {  my $self = shift;  my ( $target, $src, $src_if, $dst, $dst_if, $options ) = @_;  my ($fw) = $self->prototypes( $target, $options );  block_udp_ruleset( $fw, $src, $src_if, $dst, $dst_if );}sub accept_rules {  my $self = shift;  my ( $target, $src, $src_if, $dst, $dst_if, $options ) = @_;  my ($fw) = $self->prototypes( $target, $options );  my $masq = defined $options->{portfw} ? PORTFW :    $options->{masq} ? MASQ : NOMASQ;  accept_udp_ruleset( $fw, $src, $src_if, $dst, $dst_if,		      $masq, $options->{portfw} );}sub account_rules {  my $self = shift;  my ( $target, $src, $src_if, $dst, $dst_if, $options ) = @_;  my ($fw) = $self->prototypes( $target, $options );  my $masq = defined $options->{portfw} ? PORTFW :    $options->{masq} ? MASQ : NOMASQ;  acct_udp_ruleset( $fw, $src, $src_if, $dst, $dst_if,		      $masq, $options->{portfw} );}sub valid_options {  my  $self = shift;  ( "client" );}1;=pod=head1 NAMEFwctl::Services::ntp - Fwctl module to handle the NTP protocol.=head1 SYNOPSIS    accept   ntp -src PROXY -dst NTP_SERVER    accept   ntp -src PROXY -dst NTP_SERVER -client -masq #For ntpdate=head1 DESCRIPTIONThis module enable NTP traffic between two NTP servers. If youuse the I<client> option, it will use UNPRIVILEGED_PORTS for the SourcePort to enable ntp clients like B<ntpdate>.=head1 AUTHORFrancis J. Lacoste <francis.lacoste@iNsu.COM>=head1 COPYRIGHTCopyright (c) 1999,2000 iNsu Innovations Inc.All rights reserved.This program is free software; you can redistribute it and/or modifyit under the terms of the GNU General Public License as published bythe Free Software Foundation; either version 2 of the License, or(at your option) any later version.=head1 SEE ALSOfwctl(8) Fwctl(3) Fwctl::RuleSet(3)=cut