#!/bin/bash
#########################################################################
# Script:	check_switch.sh   		                                    #
# Autor: 	Alejandro							         	            #
# Proposito:Monitorear Interfaces de Switch 3com 4400 y 3226			#
#########################################################################

#########################################################################
# Usage: ./check_switch.sh -H HOST -c COMMUNITY  -p PORT SWITCH
#########################################################################
help="\ncheck_switch.sh (c) 2008-2014 GNU GPLv2 licence
Usage: ./check_switch.sh -H HOST -c COMMUNITY -p PORT
Options:\n-H IP Switch \n-c COMMUNITY String \n-p PORT SWITCH (01,11,23)"

STATE_OK=0			# define the exit code si status is OK
STATE_WARNING=1		# define the exit code si status is Warning
STATE_CRITICAL=2	# define the exit code si status is Critical
STATE_UNKNOWN=3		# define the exit code si status is Unknown

export PATH=$PATH:/usr/local/bin:/usr/bin:/bin # Set path

# Validamos si el usuario necesita ayuda sobre el plugin y se la mostramos
#########################################################################
if [ "${1}" = "--help" -o "${#}" = "0" ]; 
	then 
	echo -e "${help}";
	exit 1;
fi

# Validamos que los parametros sean los correctos
#########################################################################
while getopts "H:c:p:h" Input;
do
	case ${Input} in
	H)	host=${OPTARG};;
	c)	community=${OPTARG};;
	p)	port=${OPTARG};;
	h)      echo -e "${help}"; exit 1;;
	\?)	echo "Wrong option given. Please use options -H for ip switch, -c for community string and -p for port"
		exit 1
		;;
	esac
done

# Validamos que los parametros no esten vacios
#########################################################################
if [ -z "${host}" -o -z "${community}" -o -z "${port}"  ]; then
	echo -e "${help}"
	exit ${STATE_UNKNOWN}
fi

# Validamos que el nimero de interfaz sea correcto
InterfaceValid=`echo ${port} | grep -oE "^[0-4][0-9]$"`
if [ -z "${InterfaceValid}" ]; then
	echo -e "Interface ${port} invalid"
	exit 1;
	elif [ "${InterfaceValid}" -eq "00" ]; then
		echo -e "Interface ${port} invalid"
		exit 1;
fi

#Obtenemos el modelo del switch (4400 o 3226)
ModelSwitch=`snmpwalk -v 2c -c ${community} ${host} SNMPv2-MIB::sysORDescr.20 | cut -d " " -f 8`
BashVersion=`bash --version| tr '\n' ' ' | cut -d ' ' -f 4 | cut -d '.' -f 1`; 
if [ $BashVersion -eq "3" ]; then
    regexp="[a-zA-Z]";
else
    regexp=[a-zA-Z];
fi
if [[ "$ModelSwitch" =~ $regexp ]]; then
	newport=`echo ${port} | sed 's/^/1/g'`;
else
	newport=`echo ${port} | sed -e 's/0/ /g' -e 's/ //g'`;
fi

# Check the desired state of the interface	
#IntAdminStatus=`snmpwalk -v 2c -c ${community} ${host} IF-MIB::ifAdminStatus.1${port}`


# Check the current state of the interface
IntOperStatus=`snmpwalk -v 2c -c ${community} ${host} IF-MIB::ifOperStatus.${newport} 2>/dev/null`

# Validamos la conexion con el switch
if [ $? -eq "1" ]; then
	echo -e "CRITICAL: Unable to connect to switch ${host}"
	exit ${STATE_CRITICAL};
fi


# Check the last change	 state of the interface
IntLastChange=`snmpwalk -v 2c -c ${community} ${host} IF-MIB::ifLastChange.${newport}`

# Obtenemos la ubicacion del switch
SwitchLocation=`snmpwalk -v 2c -c ${community} ${host} SNMPv2-MIB::sysLocation.0`

#Agregamos la ubicacion del switch
location=`echo ${SwitchLocation} | cut -d " " -f 4,5,6,7`

#Verificamos el status del puerto
check=`echo ${IntOperStatus} | cut -d " " -f 4 | sed -e 's/\([a-zA-Z]*\)(/ /g' -e 's/)/ /g' -e 's/ //g'`
state=`echo ${IntOperStatus} | cut -d " " -f 4 | sed -e 's/([0-9])//'`

case $check in
	1)
		echo ${IntLastChange} | cut -d ' ' -f 5,6,7 | sed -e 's/^/UP: /g' -e "s/$/ Location:${location}/g"
		exit ${STATE_OK}
	;;
	2)
		echo "DOWN: Unable to connect to interface ${port}" | sed -e "s/$/ Location:${location}/g";
		exit ${STATE_CRITICAL}
	;;
	*)
		echo "WARNING: Current interface ${port} is ${state}," | sed -e "s/$/ Location:${location}/g";
		exit ${STATE_WARNING}
	;;
esac