#!/bin/bash
#
#
#	connectivity_check v0.2 Oct. 16, 2006
#	Written by Robert Pectol - http://rob.pectol.com/irlp/
#
#	Running this script will test the connectivity to your ISP's services (the Internet)
#	and can be called manually or from another script.  It returns a, '0' with an exit
#	status of 0 if the connection is detected as being, 'good', else it returns a, '1'
#	with an exit status of 1.
#
############################################################################################

pinghost=def.gwy.host.ip   # this should be set to your Internet router's default gateway host's IP address
packetcount=100            # 100 is enough to test the connection without, 'overloading' the target host
packetsize=512             # 512 bytes is approximately the same size as the audio-data packets used by IRLP
threshold=2                # this specifies the number of lost packets (threshold) to be considered acceptable

# make sure the host is reachable
result=`/bin/ping -c 1 -w 2 $pinghost 2>/dev/null | grep "1 received"`
if [ "$result" != "" ]; then
	result=""
	pass=0
	# if host is reachable, then ping flood with packets of specified size and count; try up to 3 times for a , 'passing' result
	while [[ "$pass" -lt "3" && "$result" == "" ]]; do
		result=`sudo /bin/ping -f -s $packetsize -c $packetcount $pinghost 2>/dev/null | grep 'packets transmitted' | cut -d ' ' -f6 | sed 's/%//'`
			if [ "$result" -lt "$threshold" ]; then
				# report the good news and exit
				echo "0"
				exit 0
			fi
		pass=$(($pass + 1))
		sleep .5
	done
	# report the bad news and exit
	echo "1"
	exit 1
else
	# report the bad news and exit
	echo "1"
	exit 1
fi
exit 0