tun2socks tunnel init script

tun2socks-init.sh

#!/usr/bin/env bash
[[ $(id -u) != 0 ]] && exit 1

TUN2SOCKS=tun2socks
INIT=xray.client
DEFAULTS=()
INTERFACE=usb0

trap "cleanup" EXIT

cleanup() {
    ip link del dev tun0
    for default in ${DEFAULTS[@]} ; do
	    ip route del $default via $GATEWAY dev $INTERFACE metric 1
    done
    /etc/init.d/$INIT stop
    /etc/init.d/NetworkManager restart
    pkill '^tun2socks$'
}

IP=$(jq -r '.outbound.settings.vnext[].address' "/etc/${INIT/./\/config.}.json")

#DNS=$(jq -r '.dns.servers[]' "/etc/${INIT/./\/config.}.json") || exit 1
#DEFAULTS+=($DNS)

if [[ "$IP" =~ ^[0-9]+\.[0-9]+\.[0-9]+\.[0-9]+$ ]] ; then
	DEFAULTS+=("$IP")
else
	DEFAULTS+=($(dig +short $IP))
fi

GATEWAY="$(ip route get 1.1.1.1 | sed -n 's/.* via \([^\ ]*\) .*/\1/p')"

if [[ ${#GATEWAY} == 0 ]] || ip a | grep -w tun0 ; then
    cleanup
fi

if ! ip link set dev tun0 up &>/dev/null ; then
    ip tuntap add mode tun dev tun0
    ip addr add 198.18.0.1/15 dev tun0
    ip link set dev tun0 up
fi

ip route del default
for default in ${DEFAULTS[@]} ; do
	ip route add $default via $GATEWAY dev $INTERFACE metric 1
done
ip route add default via 198.18.0.1 dev tun0 metric 2

echo -e 'nameserver 1.1.1.1' > /etc/resolv.conf

/etc/init.d/$INIT restart
$TUN2SOCKS -device tun0 -proxy socks5://127.0.0.1:1080
cleanup