#!/bin/sh
set -eu
wg show wg0 >/dev/null
ip link show wg0 | grep -q 'state UNKNOWN\|state UP'
latest=$(wg show wg0 latest-handshakes | cut -f2 | head -n 1)
now=$(date +%s)
[ "${latest:-0}" -gt 0 ]
[ $((now - latest)) -lt 180 ]
kill -0 1