setup tun2socks with script

tun2socks_cli.sh

#!/bin/bash
if [ $UID -ne 0 ]; then
    echo Please run as root.
    exit 1
fi

GW=$(ip route | grep default | awk '{print $3}')
IF=$(ip route | grep default | awk '{print $5}')
TUN=192.18.0.1
echo Detected Network: $GW $IF

echo Setting TUN device
ip tuntap add mode tun dev tun0
ip addr add $TUN/15 dev tun0
ip link set dev tun0 up

echo Setting route
ip route del default
ip route add default via $TUN dev tun0 metric 1
ip route add default via $GW dev $IF metric 10

echo Starting proxy
/opt/tun2socks-linux-amd64 -proxy protocol://method:password@ip:port -device tun0 -interface $IF

echo Clean up...
ip tuntap del mode tun dev tun0