script for https://github.com/blechschmidt/tun2proxy

tun2proxy.sh

#! /usr/bin/bash

# Please set the following parameters according to your environment
BYPASS_IP=123.45.67.89
PROXY_IP=127.0.0.1
PROXY_PORT=1080
PROXY_TYPE=SOCKS5

# check if user is root
function is_root() {
    if [ $(id -u) -eq 0 ]; then
        echo true
    else
        echo false
    fi
}

# get current user
function get_user() {
    if [ $(is_root) = true ]; then
        # echo $SUDO_USER
        echo "root"
    else
        echo $USER
    fi
}

function restore() {
    sudo ip link del tun0
    echo "tun0 deleted"

    sudo systemctl restart systemd-resolved.service
    echo "restored DNS settings"
}

function main() {
    user_name=$(get_user)

    sudo ip tuntap add name tun0 mode tun user ${user_name}
    sudo ip link set tun0 up

    sudo ip route add "$BYPASS_IP" $(ip route | grep '^default' | cut -d ' ' -f 2-)

    sudo ip route add 128.0.0.0/1 dev tun0
    sudo ip route add 0.0.0.0/1 dev tun0

    sudo ip route add ::/1 dev tun0
    sudo ip route add 8000::/1 dev tun0

    sudo sh -c "echo nameserver 198.18.0.1 > /etc/resolv.conf"

    read -n 1 -s -r -p "Press any key to exit this script..."
    echo ""

    # trap 'echo "" && echo "tun2proxy exited with code: $?" && restore' EXIT
    # ./target/debug/tun2proxy --tun tun0 --proxy "$PROXY_TYPE://$PROXY_IP:$PROXY_PORT"

    sudo ip link del tun0
    sudo systemctl restart systemd-resolved.service
}

main