openwrt-packages-dist/net/mwan3/files/usr/sbin/mwan3track

#!/bin/sh

[ -z "$9" ] && 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

echo "$$" > /var/run/mwan3track-$1.pid

score=$(($7+$8))
track_ips=$(echo $* | cut -d ' ' -f 9-99)
host_up_count=0
lost=0

while true; do

	for track_ip in $track_ips; do
		ping -I $2 -c $4 -W $5 -s 4 -q $track_ip &> /dev/null
		if [ $? -eq 0 ]; then
			let host_up_count++
		else
			let lost++
		fi
	done
		
	if [ $host_up_count -lt $3 ]; then
		let score--

		if [ $score -lt $8 ]; then score=0 ; fi
		if [ $score -eq $8 ]; then

			logger -t mwan3track -p notice "Interface $1 ($2) is offline"
			env -i ACTION=ifdown INTERFACE=$1 DEVICE=$2 /sbin/hotplug-call iface
			score=0

		fi

	else

		if [ $score -lt $(($7+$8)) ] && [ $lost -gt 0 ]; then

			logger -t mwan3track -p info "Lost $(($lost*$4)) ping(s) on interface $1 ($2)"

		fi

		let score++
		lost=0

		if [ $score -gt $8 ]; then score=$(($7+$8)); fi
		if [ $score -eq $8 ]; then

			logger -t mwan3track -p notice "Interface $1 ($2) is online"
			env -i ACTION=ifup INTERFACE=$1 DEVICE=$2 /sbin/hotplug-call iface
			rm /var/run/mwan3track-$1.pid
			exit 0
		fi
	fi

	host_up_count=0
	sleep $6
done

exit 1