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#!/bin/sh
. /lib/functions.sh
LOG="logger -t $(basename "$0")[$$] -p"
INTERFACE=""
DEVICE=""
IFDOWN_EVENT=0
clean_up() {
$LOG notice "Stopping mwan3track for interface \"${INTERFACE}\""
exit 0
}
if_down() {
$LOG info "Detect ifdown event on interface ${INTERFACE} (${DEVICE})"
IFDOWN_EVENT=1
}
validate_track_method() {
case "$1" in
ping)
# Assume that ping is installed
;;
arping)
which arping 1>/dev/null 2>&1 || {
$LOG warn "Missing arping. Please install iputils-arping package."
return 1
}
;;
httping)
which httping 1>/dev/null 2>&1 || {
$LOG warn "Missing httping. Please install httping package."
return 1
}
;;
*)
$LOG warn "Unsupported tracking method: $track_method"
return 2
;;
esac
}
main() {
local reliability count timeout interval failure_interval
local recovery_interval down up size
local keep_failure_interval
[ -z "$5" ] && echo "Error: should not be started manually" && exit 0
INTERFACE=$1
DEVICE=$2
STATUS=$3
SRC_IP=$4
mkdir -p /var/run/mwan3track/$1
trap clean_up SIGINT SIGTERM
trap if_down SIGUSR1
config_load mwan3
config_get track_method $1 track_method ping
validate_track_method $track_method || {
$LOG warn "Using ping to track interface $INTERFACE avaliability"
track_method=ping
}
config_get reliability $1 reliability 1
config_get count $1 count 1
config_get timeout $1 timeout 4
config_get interval $1 interval 10
config_get down $1 down 5
config_get up $1 up 5
config_get size $1 size 56
config_get failure_interval $1 failure_interval $interval
config_get_bool keep_failure_interval $1 keep_failure_interval 0
config_get recovery_interval $1 recovery_interval $interval
local score=$(($down+$up))
local track_ips=$(echo $* | cut -d ' ' -f 5-99)
local host_up_count=0
local lost=0
local sleep_time=0
local turn=0
if [ "$STATUS" = "unknown" ]; then
echo "unknown" > /var/run/mwan3track/$1/STATUS
score=0
else
echo "online" > /var/run/mwan3track/$1/STATUS
fi
while true; do
sleep_time=$interval
for track_ip in $track_ips; do
if [ $host_up_count -lt $reliability ]; then
case "$track_method" in
ping)
ping -I $DEVICE -c $count -W $timeout -s $size -q $track_ip &> /dev/null ;;
arping)
arping -I $DEVICE -c $count -w $timeout -q $track_ip &> /dev/null ;;
httping)
httping -y $SRC_IP -c $count -t $timeout -q $track_ip &> /dev/null ;;
esac
if [ $? -eq 0 ]; then
let host_up_count++
echo "up" > /var/run/mwan3track/$1/TRACK_${track_ip}
else
let lost++
echo "down" > /var/run/mwan3track/$1/TRACK_${track_ip}
fi
else
echo "skipped" > /var/run/mwan3track/$1/TRACK_${track_ip}
fi
done
if [ $host_up_count -lt $reliability ]; then
let score--
if [ $score -lt $up ]; then
score=0
[ ${keep_failure_interval} -eq 1 ] && {
sleep_time=$failure_interval
}
else
sleep_time=$failure_interval
fi
if [ $score -eq $up ]; then
echo "offline" > /var/run/mwan3track/$1/STATUS
$LOG 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 $(($down+$up)) ] && [ $lost -gt 0 ]; then
$LOG info "Lost $(($lost*$count)) ping(s) on interface $1 ($2)"
fi
let score++
lost=0
if [ $score -gt $up ]; then
echo "online" > /var/run/mwan3track/$1/STATUS
score=$(($down+$up))
elif [ $score -le $up ]; then
sleep_time=$recovery_interval
fi
if [ $score -eq $up ]; then
$LOG notice "Interface $1 ($2) is online"
echo "online" > /var/run/mwan3track/$1/STATUS
env -i ACTION=ifup INTERFACE=$1 DEVICE=$2 /sbin/hotplug-call iface
exit 0
fi
fi
let turn++
mkdir -p "/var/run/mwan3track/${1}"
echo "${lost}" > /var/run/mwan3track/$1/LOST
echo "${score}" > /var/run/mwan3track/$1/SCORE
echo "${turn}" > /var/run/mwan3track/$1/TURN
echo "$(date +'%s')" > /var/run/mwan3track/$1/TIME
host_up_count=0
sleep "${sleep_time}" &
wait
if [ "${IFDOWN_EVENT}" -eq 1 ]; then
score=0
echo "offline" > /var/run/mwan3track/$1/STATUS
IFDOWN_EVENT=0
fi
done
}
main "$@"