#!/bin/bash
#

## Firewall Script
#  01-07-26  by Erik Wegner
#  ntp-up <Interface> <Network>
#

INT=$1  # Interface
NET=$2  # Network

if test -z $1 || test -z $2 ; then
	echo "ntp-up <Interface> <Network>"
	echo "e.g.: ntp-up eth0 192.168.4.0/255.255.255.0"
	exit 2
fi

# Pfad zu IPTables
if test -z $IPTABLES ; then
	IPTABLES=/usr/sbin/iptables
fi

## Ports
#  Nicht-privilegierte = 1024-65535
P_HIGH=1024:65535
P_NTP=123

echo -e "\n#NTP Server $NET [$P_HIGH] <-> $INT [$P_NTP]"

# UDP-Verbindungen
echo "$IPTABLES -A INPUT -i $INT -p UDP \\
	-s $NET --sport $P_HIGH --dport $P_NTP \\
	-m state --state NEW -j ACCEPT"

#echo "$IPTABLES -A OUTPUT -o $INT -p UDP \\
#	--sport $P_NTP \\
#	--dport $P_HIGH -d $NET -j ACCEPT"

