RouterRD/routerrd at main · billy-paul1234/RouterRD · GitHub

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#!/bin/bash
#Title........: Router Redundancy Detector
#Description..: program to email to the network admin if a router fails
#Author.......: billy-paul1234
#Usage........: bash routerrd


if [ $# -eq 4 -o $# -eq 2  ]
then
	timeinterval=9999
	router1=$(ping $1 -q -c 3 | grep loss | awk '{print $4}')
	router2=$(ping $2 -q -c 3 | grep loss | awk '{print $4}')
	[ $# -eq 2 ] && mailtime=9999 || mailtime=$3
	timeformat="+%$4"
	mailid=$(cat /etc/ssmtp/ssmtp.conf | grep AuthUser);mailid=${mailid:9}
	tmp="/var/routerrd/mail-sent-time.txt"
	#echo $mailid
	#if [ [ "$router1" == "0" || "$router2" == "0"   &&   $# -ne 2 ] ]
        [ $# -ne 2 ] && if [ "$router1" == '0' -o "$router2" == '0' ]
	then
		currenttime=$(( $( date $timeformat | sed 's/^0*//' )))
		mailsenttime=$(( $( cat $tmp | sed 's/^0*//' )))

		[ $mailsenttime -eq 9999 ] && timeinterval=9999 || timeinterval=$(($currenttime -  $mailsenttime))
		[ $timeinterval -lt 0  ] && timeinterval=$((($mailsenttime + $timeinterval) + (60 - $mailsenttime)))
		#echo currenttime = $currenttime
		#echo mailsenttime = $mailsenttime
		#echo timeinterval = $timeinterval
	fi

	#echo "------------------------"
	#echo $router1 "<--router 1"
	#echo $router2 "<--Router 2"
	#echo --------------------------


	#This condition works, when router 1 is DOWN and router 2 is UP.
	if [ "$router1" == "0" -a "$router2" != "0" ]
	then
		[ $timeinterval -ge $mailtime -o $timeinterval -eq 9999  ] && if [ "$mailid" == ""  ]
			then
				echo "Please setup your mailserver"

			else
				echo "Router 1 is DOWN. Now router 2 is UP. Date & Time: $(date)" | mail -s "RouterRD" $mailid
	       			#echo "Sending mail.."
				[ $# -ne 2  ] && date $timeformat > $tmp
			fi

	#This condition works, when Two router is also DOWN
	elif [ "$router2" == "0" -a "$router1" == "0"  ]
	then
		 [ $timeinterval -ge $mailtime -o $timeinterval -eq 9999  ]  && if [ "$mailid" == ""  ]
	 		then
				echo "Please Setup your mailserver"
			else
				echo "Router 2 is also DOWN. There is no Internet connection. Date & Time: $(date)" | mail -s "RouterRD" $mailid
				#echo "Sending mail.."
				[ $# -ne 2  ] && date $timeformat > $tmp
			 fi

	# This condition works, when router 1 is UP and router 2 is DOWN
	elif [ "$router2" ==  "0" -a "$router1" != "0"  ]
	then
	        [ $timeinterval -ge $mailtime -o $timeinterval -eq 9999  ] && if [ "$mailid" == ""  ]
	       		then
				echo 'Please setup your mailserver'
			else
				#echo "Sending mail..."
				echo "Router 2 is DOWN but Router 1 is UP. Date & Time: $(date)" | mail -s "RouterRD" $mailid
			       	[ $# -ne 2  ] && date $timeformat > $tmp
			fi

	#This Works when two router is also UP
	else
		#echo "Router is Not chandged"
		[ $# -ne 2  ]  && echo 9999 > $tmp
	fi
else
	echo
	echo "
routerrd --> RRD(Router Redundency Detector)
routerrd --> command is used to detect the router state which uses HSRP(Hot Standby Routing Protocol) and send mail if any router is down

Usage:
	   routerrd  [ R1-ip ]    [ R2-ip ]
Example:
           routerrd 192.168.1.2  192.168.1.3
R1-ip  -->  Router 1 ip address
R2-ip  -->  Router 2 ip address

If you want to check your router state for each minute, add the line like bellow example by typing the command ( sudo crontab -e  )
Don't forget to customize your ip and time

Syntax:
         * * * * * routerrd   [ R1-ip ]     [ R2-ip ]    [ TI ]  [ 'M' or 'S' ]
Example:
         * * * * * routerrd  192.168.1.2   192.168.1.3     20       'M'
         * * * * * routerrd  192.168.1.2   192.168.1.3     50       'S'

TI       -->  Time interval to send mail if the router is still down
              For Minute use ( 2 - 58 )
	      For Seconds Use ( 10 - 50 )
'M'      -->  Time in minutes
'S'      -->  Time is seconds

routerrd -h --> to display this discription
"

fi