net/mwan3: add clean_up trap function for SIGINT SIGTERM

Signed-off-by: Florian Eckert <fe@dev.tdt.de>

net/mwan3/files/lib/mwan3/mwan3.sh

@@ -393,7 +393,6 @@ mwan3_track()
 
 	if [ -e /var/run/mwan3track-$1.pid ] ; then
 		kill $(cat /var/run/mwan3track-$1.pid) &> /dev/null
-		rm /var/run/mwan3track-$1.pid &> /dev/null
 	fi
 
 	if [ -n "$track_ips" ]; then

net/mwan3/files/usr/sbin/mwan3

@@ -44,7 +44,6 @@ ifdown()
 
 	if [ -e /var/run/mwan3track-$1.pid ] ; then
 		kill $(cat /var/run/mwan3track-$1.pid)
-		rm /var/run/mwan3track-$1.pid
 	fi
 }
 
@@ -129,7 +128,6 @@ stop()
 	local ipset route rule table IP IPT
 
 	killall mwan3track &> /dev/null
-	rm /var/run/mwan3track-* &> /dev/null
 
 	for IP in "$IP4" "$IP6"; do
 

net/mwan3/files/usr/sbin/mwan3track

@@ -1,17 +1,21 @@
 #!/bin/sh
 
 LOG="/usr/bin/logger -t $(basename "$0")[$$] -p"
+INTERFACE=""
+
+clean_up() {
+	$LOG notice "Stopping mwan3track for interface \"${INTERFACE}\""
+	rm "/var/run/mwan3track-${INTERFACE}.pid" &> /dev/null
+	exit 0
+}
 
 main() {
 
 	[ -z "$12" ] && echo "Error: should not be started manually" && exit 0
 
-	if [ -e /var/run/mwan3track-$1.pid ] ; then
-		kill $(cat /var/run/mwan3track-$1.pid) &> /dev/null
-		rm /var/run/mwan3track-$1.pid &> /dev/null
-	fi
-
+	INTERFACE=$1
 	echo "$$" > /var/run/mwan3track-$1.pid
+	trap clean_up SIGINT SIGTERM
 
 	local score=$(($7+$8))
 	local track_ips=$(echo $* | cut -d ' ' -f 12-99)