redundant.sh

redundant.sh

#!/bin/bash
#
# redundant.sh
#
# 	Este script tratará a redundância entre dois links de internet. 
#
#	Author: Tácito Chaves - 2013-08-04 
#	e-mail: chaves@tchaves.com.br
#	fone: (98) 8123-8153 / 8857-9777
# set -x

DATA=$(date +%d/%m/%Y)
HORA=`date +%R` 
DEFAULT=$(route -n | grep ^0.0.0.0 | awk '{print $2}')
INT_DEFAULT=$(route -n | grep ^0.0.0.0 | awk '{print $8}')
GW_PRINCIPAL=10.0.3.2
GW_SECUNDARIO=192.168.3.254
INT_PRINCIPAL=eth1
DESTINO=8.8.8.8
LOG=/var/log/link.log

	if [ "$DEFAULT" == "$GW_PRINCIPAL" -a "$INT_DEFAULT" == "$INT_PRINCIPAL" ]; then
	PING=$(ping -c3 $DESTINO | grep -Eo "[0-9]{1,3}% packet loss")
		if [ "$PING" = '100% packet loss' ]; then
			`route add default gw $GW_SECUNDARIO`
			`route del default gw $GW_PRINCIPAL`
			echo "LINK PRINCIPAL - DOWN $DATA $HORA" >> $LOG
			echo "LINK PRINCIPAL - DOWN $DATA $HORA" | mutt -s "Link de Internet" tacito.ma@hotmail.com
		else
			echo "LINK PRINCIPAL - OK $DATA $HORA" >> $LOG
		fi
	else
		`route add default gw $GW_PRINCIPAL`
		PING=$(ping -I $INT_PRINCIPAL -c3 $DESTINO | grep -Eo "[0-9]{1,3}% packet loss")
		if [ "$PING" = '0% packet loss' ]; then
			`route del default gw $GW_SECUNDARIO`
			echo "LINK PRINCIPAL VOLTOU $DATA $HORA" >> $LOG
			echo "LINK PRINCIPAL VOLTOU $DATA $HORA" | mutt -s "Link de Internet" tacito.ma@hotmail.com
		else
			`route del default gw $GW_PRINCIPAL`
			echo "LINK PRINCIPAL CONTINUA DOWN $DATA $HORA" >> $LOG
			echo "LINK PRINCIPAL CONTINUA DOWN $DATA $HORA" | mutt -s "Link de Internet" tacito.ma@hotmail.com
		fi
	fi