#!/bin/bash

## Author Luis@32768.org at 2012-02-14
## check ping for ups every 2 mins, if down, shutdown in 3 mins, if ok within 2 mins, recover shutdown

## while true
## do

## get the gateway IP
GWIP='127.0.0.1'
let N=0
for x in `/sbin/route | grep default`
do
        if [ $N -eq 1 ]
        then
                GWIP=$x
                break
        fi
        let N=N+1
done

ping -w 5 -c 1 $GWIP > /dev/null

ret=$?
	if [ $ret -eq 0 ]
	then
		# $ret = 0
		# router is OK
		#echo "Router is UP!"
		## sleep 10
		pscnt=`ps aux | grep shutdown | grep -v grep | wc -l`
		if [ $pscnt -gt 0 ]
		then
			#echo "Luis_UPS: AC Power/Network Recovered! Cancel shutdown!"
			/sbin/shutdown -c "Luis_UPS: AC Power/Network Recovered! Cancel shutdown!" &
		fi
	else
		# $ret = 1
		# if router fail, it meas 220V is down, or network is down
		#echo "Router is DOWN!"
		#echo "Luis_UPS: AC Power/Network Failed! Ready to shutdown in 180s!"
		pscnt=`ps aux | grep shutdown | grep -v grep | wc -l`
		if [ $pscnt -eq 0 ]
		then
			# if no shutdown in progress, then shutdown
			#echo "Luis_UPS: AC Power/Network Failed! Ready to shutdown in 3 mins!"
			/sbin/shutdown -h 3 "Luis_UPS: AC Power/Network Failed! Ready to shutdown!" &
		fi
	fi
## done