#!/bin/bash
#
# Run this on the server - 
# either the server that runs stunnel,
# or the server that runs the docker stunnel container.

function usage {
    echo ""
    echo "open_fw.sh script:"
    echo "opens the firewall to a particular port using iptables."
    echo "specify a port number for the firewall to open:"
    echo ""
    echo "        ./open_fw.sh 666"
    echo ""
}


if [[ "$#" -ne 1 || $1 =~ "[0-9]\{1,5\}" ]];
then
    usage
else

    iptables -A INPUT -p tcp --dport ${1} -j ACCEPT
    iptables -A FORWARD -p tcp -j ACCEPT --dport ${1} -m state --state NEW

fi