#!/bin/bash
BOOT=${1-yes}
echo $BOOT
while true;
do
wan=`ip -4 a | grep inet | grep -v '172.1[6-9]\..*\..*\|172.2[0-9]\..*\..*\|172.3[0-1]\..*\..*\|192.168\..*\..*\|10.[0-255].\..*\..*\|127.0.0.1\|172.17.0.1' | wc -l`
lan=`ip -4 a | grep -e '10\..*\..*\..*' | wc -l`
if [ $wan -gt 0 ] && [ $lan -gt 0 ]; then
    echo "Use LAN with WAN"

    WAN_ADDR=`ip -4 a | grep inet | grep -v '172.1[6-9]\..*\..*\|172.2[0-9]\..*\..*\|172.3[0-1]\..*\..*\|192.168\..*\..*\|10.[0-255].\..*\..*\|127.0.0.1\|172.17.0.1' |  awk '{print $2}' | cut -d '/' -f 1`
    echo $WAN_ADDR
    WAN_NET=`echo $WAN_ADDR | cut -d "." -f 1,2,3`
    echo $WAN_NET
    LAN_ADDR=`ip -4 a | grep -e '10.[0-255].\..*\..*' | awk '{print $2}' | cut -d '/' -f 1`
    echo $LAN_ADDR
    LAN_PREFIX=`ip -4 a | grep -e '10.[0-255].\..*\..*' | awk '{print $2}' | cut -d '/' -f 2`
    echo $LAN_PREFIX
    IFS=. read -r i1 i2 i3 i4 <<< $LAN_ADDR
    D2B=({0..1}{0..1}{0..1}{0..1}{0..1}{0..1}{0..1}{0..1})
    binIP=${D2B[$i1]}${D2B[$i2]}${D2B[$i3]}${D2B[$i4]}
    binIP0=${binIP::$LAN_PREFIX}$(printf '0%.0s' $(seq 1 $((32-$LAN_PREFIX))))
    LAN_GATE=$((2#${binIP0::8})).$((2#${binIP0:8:8})).$((2#${binIP0:16:8})).$(echo 1)
    LAN_NET=`echo $LAN_ADDR | cut -d "." -f 1,2,3`

    WAN_DEV=`ip -4 a  | grep $WAN_NET | awk '{print $7}'`

    LAN_DEV=`ip -4 a | grep $LAN_NET | awk '{print $7}'`

    # check if route to wan was set
    WAN_GATE=`ip r | grep "default via $WAN_NET" | wc -l`
    echo $WAN_NET
    echo $LAN_GATE
    echo "ADD route"
    ip route add 10.10.0.0/16 via $LAN_GATE dev $LAN_DEV
    ip route add 172.24.8.0/24 via $LAN_GATE dev $LAN_DEV
    if [ $WAN_GATE -lt 1 ]; then
        echo "Adding default route"
        ip route del default
	      dhclient $WAN_DEV
        #ip route add default via $WAN_NET.1
    fi
    echo "ADD route done"

else
    if [ $wan -gt 0 ]; then
        echo "Use only WAN"
        dhclient $WAN_DEV
    elif [ $lan -gt 0 ]; then
        echo "Use only LAN"
        dhclient $LAN_DEV
    fi
fi
if [  $BOOT == 'yes' ]; then
    exit 0
fi
sleep 1
done