cloudflare_dns: fix #1

services/cloudflare_update_dns

@@ -22,6 +22,13 @@ function error() {
 	echo "$(date --iso-8601=minutes) CLOUDFLARE_DNS_UPDATE [ERROR]: ${*}"
 }
 
+function check_internet_access() {
+  wget -q --spider https://google.com
+  if [ $? -ne 0 ]; then
+    error "No internet connection. Exiting..."
+    exit 1
+  fi
+}
 
 function check_new_ip() {
 	local new_ip
@@ -37,6 +44,7 @@ function check_new_ip() {
 	fi
 }
 
+check_internet_access
 check_new_ip
 
 curl_answer="$(curl --request PATCH \