add ping internet function and fix some spacing issues

advanced/Scripts/piholeDebug.sh

@@ -301,6 +301,31 @@ ping_gateway() {
   fi
 }
 
+ping_internet() {
+  local protocol="${1}"
+  # If the protocol is 6,
+  if [[ ${protocol} == "6" ]]; then
+    # use ping6
+    local cmd="ping6"
+    # and Google's public IPv6 address
+    local public_address="2001:4860:4860::8888"
+  # Otherwise,
+  else
+    # use ping
+    local cmd="ping"
+    # and Google's public IPv4 address
+    local public_address="8.8.8.8"
+  fi
+  echo -n "     ${INFO} Trying three pings on IPv${protocol} to reach the Internet..."
+  if ! ping_inet="$(${cmd} -q -W 3 -c 3 -n ${public_address} -I ${PIHOLE_INTERFACE} | tail -n 3)"; then
+    echo -e "          ${CROSS} Cannot reach the Internet"
+    return 1
+  else
+    echo -e "          ${TICK} Query responded."
+    return 0
+  fi
+}
+
 check_networking() {
   echo_current_diagnostic "Networking"
   detect_ip_addresses "4"