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#!/bin/bash
if [ ! $# -eq 2 ];then
echo "Usage:`basename $0` IP PORT" && exit 1
else
echo $1 | grep -oq "[0-9]\{1,3\}\.[0-9]\{1,3\}\.[0-9]\{1,3\}\.[0-9]\{1,3\}$"
if [ ! $? -eq 0 ]; then
echo "Illegal IP $1"
exit 2
else
echo "Correct IP format $1"
fi
echo $2 | grep -oq "[0-9]\{1,5\}$"
if [ ! $? -eq 0 ]; then
echo "Illegal PORT $2"
exit 3
else
echo "Correct PORT format $2"
fi
fi
IP=$1
PORT=$2
# set all rules default if you want
read -p "Do you want to restor the firewall first?" -t 10 an
[ $an = "y" -o $an = "yes" ] && echo "Reatoring..." && iptables-restore < /etc/rc.d/firewall.rule
# set portforward rules
read -p "${IP}:${PORT} Is it right ? [y/n]" -t 10 ans
ans=${ans:-"n"}
case "$ans" in
y|Y|yes|YES)
iptables -t nat -I PREROUTING -d 219.140.A.B -p tcp \
--dport $PORT -j DNAT --to $IP
iptables -t nat -I POSTROUTING -d $IP -p tcp \
--dport $PORT -j SNAT --to 192.168.0.1
echo "Have done , please check your iptables"
;;
n|N|no|NO)
echo "You canceled . Exit now"
exit
;;
*)
echo "Only can enter y or n!"
exit
esac
exit 0
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