#!/bin/bash
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# File         check_procurve_loop
# Version      5
# Description  Monitor HP ProCurve switches for activated loop protection
# Copyright    Datarådgivarna AB, Nyköping, Sweden
# License      Licensed under GPL
# Written by   Daniel Ruus
# Modified by  Daniel Ruus
# Created      2012-07-08
# Modified     2012-07-18
#
# Changelog
# ===============================================
#    5  2012-07-18 Daniel Ruus
#     - Added the utils.sh file, cleaned up the code
#    4  2012-07-10 Daniel Ruus
#     - Added a note about the license used (GPL) in the header.
#    3  2012-07-10 Daniel Ruus
#     - Corrected misspelled variable from STATUS_UNKNOWN to STATE_UNKNOWN
#       used when the command snmpwalk generates an error. This resulted
#       in an incorrect exit code of 0 being handed over to Nagios, which
#       in turn flagged the test as being OK, despite the status saying
#       the status was in an unknown state.
#    2  2012-07-08 Daniel Ruus
#     - Misc modifications, such as removing redundant code and catching
#       errors thrown by snmpwalk
#    1  2012-07-08 Daniel Ruus
#     - Initial release
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####                         VARIABLE DEFINITIONS                        ####
####                                                                     ####
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# Variable: PATH
# Purpose : Define a path variable for useful directories
PATH=/usr/local/bin:/usr/bin:/bin 

# Variable: PROGRNAME
# Purpose : Extract the scriptname
PROGNAME=`basename $0`

# Variable: PROGPATH
# Purpose : Extract the path
PROGPATH=`echo $0 | sed -e 's,[\\/][^\\/][^\\/]*$,,'`

# Variable: REVISION
# Purpose : The version number of this script
REVISION="5"

# Variable: PORTCNT
# Purpose : Counter for the number of ports available on the switch
PORTCNT=0

#### End of variable definitions ###

# Include the utils.sh file
. $PROGPATH/utils.sh


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####                                                                     ####
####                         FUNCTION DEFINITIONS                        ####
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print_usage() {

	echo "Usage: ${PROGNAME} -H <host> -C <snmp community>"

} # EOF print_usage()

print_help() {

	print_revision $PROGNAME $REVISION
	echo ""
	print_usage
	echo ""
	echo "This plugin uses snmp to check if a HP ProCurve switch has detected a loop."
	echo ""
	support
	exit 0

} # EOF print_help()


# We require the program snmpwalk, so check that we can find it
check_cmd=$(which snmpwalk > /dev/null)
if [[ "$?" -gt 0 ]]
then
	# Oh no, can't find snmpwalk!
	echo "UNKNOWN - unable to locate snmpwalk, please verify that the program is installed and the variable PATH is correct"
	exit $STATE_UNKNOWN
fi

# Handle the command line arguments
if [ "$1" = "-h" ]
then
	print_help
	exit 1
fi

if [ $# -lt 4 ]
then
	print_usage
	exit 1
fi

while getopts "H:C:" ARGV;
do
       case ${ARGV} in
       H)      host=${OPTARG};;
       C)      community=${OPTARG};;
       *)      echo "Incorrect option given. Please use options -H for host, -C for SNMP-Community."
               exit 1
               ;;
       esac
done


# Run snmpwalk and check the status
status=$(snmpwalk -v 2c -O vqe -c $community $host 1.3.6.1.4.1.11.2.14.11.5.1.12.1.5.2.1.1.2 2>&1)
retval=$?

if [[ "$retval" -gt 0 ]]
then
	echo "UNKNOWN - snmpwalk generated error code $retval, message is '$status'"
	exit $STATE_UNKNOWN
fi

state_crit=0
list_ports=""
for s in $status
do
	PORTCNT=$(((PORTCNT + 1)))
	if [ "$s" = "1" ];
	then
		state_crit=$(((state_crit + 1)))
		list_ports="$list_ports $PORTCNT"
	fi
done



# Report our findings
if [ $state_crit -eq 0 ]
then
	# Everything seem to be OK, so report that to Nagios
	echo "OK - No loops detected ($PORTCNT ports checked)"
	exit $STATE_OK
elif [ $state_crit -gt 0 ]
then
	# Hmm, we have found a loop so report this!
	loopcnt=$(((state_crit - 1)))
	if [ $loopcnt -eq 1 ]
	then
		echo "CRITICAL - found a loop on the following ports: $list_ports ($PORTCNT ports checked)"
	else
		echo "CRITICAL - found loops on the following ports: $list_ports ($PORTCNT ports checked)"
	fi
	exit $STATE_CRITICAL
else
	echo "UNKNOWN - unknown state"
	exit $STATE_UNKNOWN
fi

# The script should never get this far, but let's flag this to Nagios anyway
echo "UNKNOWN - should never reach this part!"
exit $STATE_UNKNOWN