wg_setup.sh

#!/usr/bin/env bash

iface=$(ip -4 route list 0/0 | cut -d " " -f 5)
gateway=$(ip -4 route list 0/0 | cut -d " " -f 3)
ip=$(ip -4 route get $gateway | head -n 1 | cut -d " " -f 5)
# XXX check if gateway/ip in VPN range
set -v #echo on
ip address flush $iface
ip address add $ip/32 dev $iface
ip route add $gateway/32 dev $iface src $ip
ip route add default via $gateway dev $iface src $ip
wg-quick up wg0
# Fix stuck SSH on some connections by adjusting MTU
# see https://lists.zx2c4.com/pipermail/wireguard/2017-May/001265.html
ip link set mtu 1416 dev wg0