#!/bin/bash
#
# This script does an snmpwalk of all the sensors present on an HP Procurve switch.
# Those sensors lie in the .1.3.6.1.4.1.11.2.14.11.1.2.6.1.4 OID path, so it checks all the OID behind the parent OID:
# .1.3.6.1.4.1.11.2.14.11.1.2.6.1.4.1, ...4.2, ...4.3 and so on.
# If one or more sensors present a Critical ("INTEGER: 2") or Warning ("INTEGER: 3") condition it outputs the failed or failing 
# hardware component description. Descriptions lie in the .1.3.6.1.4.1.11.2.14.11.1.2.6.1.7 OID path: ...7.1 description matches
# ...4.1 status, ...7.2 matches ...4.2 and so on.
# The other SNMP conditions, "1" - Unknown and "5" - Not Present are not evaluated.
# Tested with HP Procurve families: 41xx,40xx,25xx,24xx,26xx but should work fine with others, provided the OID paths remain the same.
#
##
# Last modified by Roberto Carraro on 20120809

print_usage() {
        echo ""
        echo "This plugin checks the hardware health of HP Procurve switchtes' components via SNMP."
        echo ""
        echo "Usage: $0 <snmp community> <hostname>"
        echo ""
        exit 3
}

if [ $# -lt 2 ] ; then
 print_usage
fi

# Defines OID parent paths
SNMPOIDstatus=".1.3.6.1.4.1.11.2.14.11.1.2.6.1.4"
SNMPOIDdescr=".1.3.6.1.4.1.11.2.14.11.1.2.6.1.7"

# Check if one or more sensors are in a BAD condition
SNMPoutput=`snmpwalk -v 2c -c $1 $2 "$SNMPOIDstatus" | grep "INTEGER: 2"`
#The exit state of the last row is evaluated '0' if True or '1' if False and is intercepted by '$?'
if [[ $? -eq 0 ]] ; then
	# Catches the last digit of the OID representing the failed hardware component
        SNMPdigit=`echo "$SNMPoutput" | awk '{ print $1; }' | awk '{ print substr($0, length($0),1) }'`
	# Creates the description OID
	SNMPoid="$SNMPOIDdescr.$SNMPdigit"
	# Gets the failed hardware component description
	echo "Failed component: "`snmpget -v 2c -c $1 $2 "$SNMPoid" | cut -d"\"" -f2 | sed 's/Sensor//g'`
	# Throws out the exit code which will be handled by Nagios as Critical
        exit 2
fi

# Check if one or more sensors are in a WARNING condition
SNMPoutput=`snmpwalk -v 2c -c $1 $2 "$SNMPOIDstatus" | grep "INTEGER: 3"`
#The exit state of the last row is evaluated '0' if True or '1' if False and is intercepted by '$?'
if [[ $? -eq 0 ]] ; then
        # Catches the last digit of the OID representing the failing hardware component
        SNMPdigit=`echo "$SNMPoutput" | awk '{ print $1; }' | awk '{ print substr($0, length($0),1) }'`
        # Creates the description OID
        SNMPoid="$SNMPOIDdescr.$SNMPdigit"
        # Gets the failed hardware component description
	echo "Failing component: "`snmpget -v 2c -c $1 $2 "$SNMPoid" | cut -d"\"" -f2 | sed 's/Sensor//g'`
        # Throws out the exit code which will be handled by Nagios as Warning
        exit 1
fi

# Check if all sensors are in GOOD condition
SNMPoutput=`snmpwalk -v 2c -c $1 $2 "$SNMPOIDstatus" | grep "INTEGER: 4"`
#The exit state of the last row is evaluated '0' if True or '1' if False and is intercepted by '$?'
if [[ $? -eq 0 ]] ; then
        echo "HP switch hardware is OK"
        # Throws out the exit code which will be handled by Nagios as OK
        exit 0
fi

# Something's wrong; catch-all
echo "UNKNOWN"
exit 3