feat: Firewall info

location=$(cat "$file")

if ! curl -m 20 -ILfSs "http://$location/" > /dev/null; then

  echo "Failed to reach page at http://$location" && exit 1

  if [[ "$location" == "20.20"* ]]; then

    ip="20.20.20.1"

    port="${location##*:}"

    echo "Failed to reach DSM at port $port"

  else

    echo "Failed to reach DSM at http://$location"

    ip=$(ip address show dev eth0 | grep inet | awk '/inet / { print $2 }' | cut -f1 -d/)

  fi

  echo "You might need to whitelist IP $ip in the DSM firewall." && exit 1

fi

echo "Healthcheck OK"