#!/bin/sh

SHELL="/bin/bash"

NIC=$( route|grep default|awk '{print $NF}' )

NAME="${1}"
OP="${2}"
SUBOP="${3}"
ARGS="${4}"

add_rule() {
    TABLE=$1
    CHAIN=$2
    ARGS=$3
    iptables -t $TABLE -C $CHAIN $ARGS
    if [ "$?" -ne 0 ]
    then
        iptables -t $TABLE -I $CHAIN 1 $ARGS
    fi
}

add_port_fwd_rule() {
    DPORT=$1
    VMIP=$2
    TOPORT=$3

    add_rule "nat" "PREROUTING" "-p tcp -i $NIC --dport $DPORT -j DNAT --to-destination $VMIP:$TOPORT"
}

if [ "$OP" = "start" ]
then
    XOS=$( getent hosts xos | awk '{print $1}' )
    if [ -n "$XOS" ]
    then
	add_port_fwd_rule 80 $XOS 80
    fi
    add_rule "filter" "FORWARD" "-p tcp --dport 80 -j ACCEPT"
fi