#!/bin/bash
#
#Script to test network availability, and notify if the internet is down.
#
#
#Written in jEdit by
#Tony Dodd <tony@defenderhosting.com>
#

#declare some variables

#The following three ip variables should each contain a valid ip.
checkip1="204.157.6.3"
checkip2="205.177.13.2"
checkip3="4.2.2.1"

#This should be set to whatever the name for your private nic is
privif="eth0"

#Do not change this block
test1="`fping $checkip1`\n"
test2="`fping $checkip2`\n"
test3="`fping $checkip3`"
live1=""
live2=""
live3=""
alive=""
privip="`ifconfig $privif | head -2 | tail -1 | awk '{print $2}' | cut -d":" -f2`"

#Set this to the e-mail address that notifications should go to
addr="alerts@10.0.250.250"

#Set this to the subject you want to appear on mails for problem nodes
subject="Connectivity issues - `hostname -s` - $privip"

#Set this to the content you want to appear on mails for problem nodes
content="`hostname -s` - $privip - has connectivity issues

Results:

$test1
$test2
$test3"

function test {

#function to test the status of connectivity, and converts the output into a 1 or 0 value	
	
if [ "x`fping $checkip1 | awk '{print $3}'`" == "xalive" ]
then
	live1=1
else
	live1=0
fi

if [ "x`fping $checkip2 | awk '{print $3}'`" == "xalive" ]
then
	live2=1
else
	live2=0
fi

if [ "x`fping $checkip3 | awk '{print $3}'`" == "xalive" ]
then
	live3=1
else
	live3=0
fi

#adds output together to give a total value

alive="$(( $live1 + $live2 + $live3 ))"

}

function result {
	
#checks whether the total value is greater than 1, if it is, then things are likely ok.  If not, there are issues.

if [ $alive -ge 1 ]
then
	exit 0
else
	alert
fi

}

function alert {
	
#sends the e-mail in case of issues

printf "$content" | mail -s $subject $addr

}

test
result
alert