[Bash] Host checker

2007-11-24T12:18:57+00:00

A simple bash script that send a mail if a set Host is down, simple by pinging it in a time interval.

#!/bin/bash
# Host checker 0.6
# original idea by no0tic
# modified by motoplux

#Hosts list
HOST[1]=192.168.1.1;
HOSTname[1]=link1;
HOST[2]=192.168.0.1;
HOSTname[2]=link2;
HOST[3]=192.168.0.5;
HOSTname[3]=link3;
HOST[4]=192.168.0.100;
HOSTname[4]=link4;

# number of hosts
NHOST=4;

# email Subject
SUBJECT="Segnalazione problema Host"
# email To
EMAIL="miamail@quelloched'è"

for i in $(seq 1 $NHOST); do
	fail[$i]=0;
done	

while [ 1 ]; do
	#do 1 ping to localhost	
	ping -c 1 localhost > /dev/null ;
	if [[ "$?" -eq 0 ]]
	then
		for i in $(seq 1 $NHOST); do
			#do 1 ping to host		
			ping -c 1 ${HOST[$i]} > /dev/null ;
	   		if ! [[ "$?" -eq 0 ]]
				then 
					if [[ "${fail[$i]}" -eq 0 ]] 
						then 			
							#play alarm.wav;
							#display alarm in terminal
							echo "Problemi all'host ${HOST[$i]} alias ${HOSTname[$i]}";
							# send an email using mail
							echo "Problemi all'host ${HOST[$i]} alias ${HOSTname[$i]}" | mail -s "$SUBJECT" "$EMAIL"
							fail[$i]=1;
					fi
				else
					fail[$i]=0;
			fi
  					
		done			
		
	   #time in seconds before repeating ping		  
	   #sleep 3;
	else
		echo "Problemi di host locale";
		exit -1;
	fi
done