rpi_darmstadt/check_vpn.sh

#!/bin/sh

LOG_FILE=/var/log/vpn_check.log
now=$(date)


echo "${now} - Running Check" | tee -a ${LOG_FILE}

curl -sI https://tbsgl.xyz/vpn_darmstadt | grep "HTTP/2 200" | grep -v grep > /dev/null
# Check if VPN-On Flag is set
if [ $? = 0 ]
	then
	ping -c 1 192.168.178.1 | grep "64 bytes from" | grep -v grep > /dev/null
	# Check if VPN is already connected
	if [ $? != 0 ]
		then
		# If not, then Restart VPN
		systemctl restart vpnc@fb > /dev/null
		echo "Ping not successful - Restarting VPN\n" | tee -a ${LOG_FILE}
	else
		echo "Ping reached router, doing nothing\n" | tee -a ${LOG_FILE}
	fi
else
	systemctl stop vpnc@fb
	echo "VPN Flag seems to be disabled or no Internet, stopping service\n" | tee -a ${LOG_FILE}
fi