#!/bin/bash

INTERFACE=mullvad
FAILED_FILE=/tmp/mullvad.failed
fail=false

if [ ! -e /sys/class/net/$INTERFACE ]; then
	echo "$INTERFACE interface does not exist"
	fail=true
else
	start_bytes=$(cat /sys/class/net/$INTERFACE/statistics/rx_bytes)
	sleep 30
	end_bytes=$(cat /sys/class/net/$INTERFACE/statistics/rx_bytes)

	if [ $(($end_bytes-$start_bytes)) -lt 1000 ]; then
		#echo "no traffic via $INTERFACE"
		fail=true
	fi
fi

if $fail; then
	systemctl is-active openvpn-client@mullvad.service > /dev/null
	if [ $? -ne 0 ]; then
		systemctl status openvpn-client@mullvad.service
		if [ -e $FAILED_FILE ]; then
			echo restart openvpn-client@mullvad.service
			systemctl restart openvpn-client@mullvad.service
		else
			touch $FAILED_FILE
		fi
	fi
else
	if [ -e $FAILED_FILE ]; then
		rm $FAILED_FILE
	fi
fi