zserviceforward

#!/bin/bash
#
# Forward a connection from one ip:port on this host to another 
# ip:port on this host
#

CREATEORDROP=$1
DEST_IP=$2
DEST_PORT=$3
MAIN_IP=10.10.6.4

usage() {
    echo "usage: $0 -c <from ip> <port>"
    echo "       $0 -r <from ip> <port>"
    echo ""
    echo "       redirect traffic to <from ip> and <port>"
    echo "       to main ip and port."
    echo "       -c create a redirection"
    echo "       -r remove a redirection"
}

if [ -z "$CREATEORDROP" ]; then
    usage
    exit -1
fi

if [ "$CREATEORDROP" = "-l" ]; then
    sudo /sbin/iptables -t nat -L | grep "DNAT" | awk "{print \"Forwarding \" \$5 \" \" \$7 \" to ${MAIN_IP}\" }"
    exit 0
fi

if [ -z "$DEST_IP" ]; then
    usage
    exit -1
fi

if [ -z "$DEST_PORT" ]; then
    usage
    exit -1
fi

if [ "$CREATEORDROP" = "-c" ]; then
   sudo  /sbin/iptables -t nat -A OUTPUT -p tcp -d $DEST_IP/32 --dport $DEST_PORT -j DNAT --to-destination ${MAIN_IP}:${DEST_PORT}
elif [ "$CREATEORDROP" = "-r" ]; then
    TST="0"
    while [ "$TST" = "0" ] ; do
	sudo /sbin/iptables -t nat -D OUTPUT -p tcp -d $DEST_IP/32 --dport $DEST_PORT -j DNAT --to-destination ${MAIN_IP}:${DEST_PORT} 2>/dev/null
	TST="$?"
    done
else
    echo "ERROR: Unknown option $1"
    usage
    exit -1
fi