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|
#!/bin/sh
. /lib/functions.sh
. /lib/functions/network.sh
CHECK_INTERVAL=$1
shift
WATCHDOG_TIMEOUT=$1
shift
USE_WATCHDOG=$1
shift
SAVE_LOGS=$1
shift
INTERFACES="$*"
ACTIVE=0
NO_NEIGHBORS_COUNT=0
MIN_KICK=5
log() {
local msg="$1"
logger -t naywatch "$msg"
}
write_logs() {
save_log() {
eval $1 > /root/$(date +%s)-"$1".log
}
config_load naywatch
config_list_foreach general save_cmd save_log
sync
}
neighbors_available() {
local phy
for interface in $INTERFACES; do
network_get_physdev phy $interface > /dev/null 2>&1
linklocal=$(ip -6 a list dev $phy | grep "scope link" | awk '{print $2}' | sed 's/\/64//') 2> /dev/null
ips=$(ping ff02::1%$phy -w5 -W5 -c2 | awk '/from/{print($4)}' | sed 's/.$//') 2> /dev/null
for ip in $ips; do
if [ $ip != $linklocal ] && [ $(owipcalc $ip linklocal) -eq 1 ]; then
echo 1
return 0
fi
done
done
echo 0
}
activate_watchdog() {
# disable openwrt instrumentation:
ubus call system watchdog '{"magicclose":true,"stop":true,"timeout":'${WATCHDOG_TIMEOUT}'}' > /dev/null
exec 3>/dev/watchdog
}
reboot_now() {
# copied from watch-cat
reboot &
[ "$1" -ge 1 ] && {
sleep "$1"
echo 1 >/proc/sys/kernel/sysrq
echo b >/proc/sysrq-trigger
}
}
no_neighbors() {
log "No Neighbors Available!"
NO_NEIGHBORS_COUNT=$(($NO_NEIGHBORS_COUNT+1))
if [ $ACTIVE -eq 0 ]; then
return 0
fi
if [ $SAVE_LOGS -eq 1 ]; then
log "Saving Logs!"
write_logs
fi
if [ $USE_WATCHDOG -eq 0 ] && [ $NO_NEIGHBORS_COUNT -gt $MIN_KICK ]; then
reboot_now 10
fi
}
log "Naywatch Started!"
neighbors() {
if [ $ACTIVE -eq 0 ]; then
log "Naywatch Activated!"
fi
ACTIVE=1
NO_NEIGHBORS_COUNT=0
if [ $USE_WATCHDOG -eq 1 ]; then
echo 1 >&3
fi
}
not_active() {
if [ $USE_WATCHDOG -eq 1 ]; then
echo 1 >&3
fi
}
if [ $USE_WATCHDOG -eq 1 ]; then
activate_watchdog
fi
while [ 1 ]; do
# first sleep
sleep $CHECK_INTERVAL
has_neighbor=$(neighbors_available)
if [ $has_neighbor -eq 0 ] && [ $ACTIVE -eq 1 ]; then
no_neighbors
elif [ $has_neighbor -eq 1 ]; then
neighbors
else
not_active
fi
done
exit 0
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