--- badi/public_scripts/switchgate/switchgate	2009/04/24 00:12:49	1.1
+++ badi/public_scripts/switchgate/switchgate	2009/12/17 11:16:34	1.2
@@ -16,6 +16,10 @@ CONFIG_PATH="/etc/switchgate"
 # the dhclient-exit-hook helper program
 DHCP_TMP_DIR=/tmp/switchgate
 
+# eMail address to send alert messages, if not operating on the
+# standard default gateway
+ALERT_EMAIL="adi@ente.limmat.ch"
+
 # Host set to ping. A file containing IP addresses, each on a single line.
 # Do not include any local hosts, list only hosts located behind your gateways.
 HOSTSET_FILE="$CONFIG_PATH/hostset"
@@ -341,6 +345,23 @@ else
    fi
 fi
 
+# send an eMail if the connection is down or limited
+if [ -z "$UP" ]; then
+	EMAIL_BODY="Switchgate on $(hostname -f) reports: No connection!\n\n\nTime:\t\t$(date)\nGateway:\t$CURRENTGW ($CURRENTGW_ID)"
+	EMAIL_SUBJECT="Attention: $(hostname -f) has no connection!"
+	echo -e "$EMAIL_BODY" | mail -s "$EMAIL_SUBJECT" "$ALERT_EMAIL"
+	if [[ -n "$DEBUG" && "$DEBUG" != "low" ]]; then
+		echo "Alert message sent to $ALERT_EMAIL."
+	fi
+elif [ "$CURRENTGW_ID" != 0 ]; then
+	EMAIL_BODY="Switchgate on $(hostname -f) reports: Not operating on standard default gateway!\n\n\nTime:\t\t$(date)\nGateway:\t$CURRENTGW ($CURRENTGW_ID)"
+	EMAIL_SUBJECT="Attention: $(hostname -f) Not operating on standard default gateway!"
+	echo -e "$EMAIL_BODY" | mail -s "$EMAIL_SUBJECT" "$ALERT_EMAIL"
+	if [[ -n "$DEBUG" && "$DEBUG" != "low" ]]; then
+		echo "Alert message sent to $ALERT_EMAIL."
+	fi
+fi
+
 if [ "$DEBUG" = "low" ]; then
    echo
    echo "Default Gateway: $CURRENTGW ($CURRENTGW_ID)"