check_snmp_temperature.pl

#!/usr/bin/perl -w
#
# ============================== SUMMARY =====================================
#
# Program : check_snmp_temperature.pl
# Version : 0.41
# Date    : Mar 23, 2012
# Author  : William Leibzon - william@leibzon.org
# Summary : This is a nagios plugin that checks temperature sensors
#           using SNMP. Dell, HP, Cisco and other types are supported
#	    and for other systems OIDs can be easily specified too
# Licence : GPL - summary below, text at http://www.fsf.org/licenses/gpl.txt
#
# =========================== PROGRAM LICENSE =================================
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
#
# ===================== INFORMATION ABOUT THIS PLUGIN =========================
#
# This Temperature check plugin that retreives temperature sensor values from
# SNMP and can issue alerts if selected parameters are above given number
# It also returns performance data for further nagios 2.0 post-processing
#
# This program is written and maintained by:
#   William Leibzon - william(at)leibzon.org
# It is partially based on check_snmp_* plugins by:
#   Patrick Proy (patrick at proy.org)
#
# ============================= SETUP NOTES ====================================
#
# Make sure to check and if necessary adjust the the path to utils.pm
# Make sure you have Net::SNMP perl module installed
#
# If you want to check Dell servers, HP server, Juniper routers or
# Cisco Switches/Routers (cisco 7500, 5500, 2948) then you may skip
# much of the configuration hassles and use pre-programmed settings
# by using "--type" (or -T) parameter, you do still need to specify
# though if you want output as C or F with '-o' option (see examples).
# The plugin currently does not support finding critical & warning
# thresholds which most systems also report in SNMP, so actual thresholds
# you will need to specify as well.
#
# NOTE: If you've previously used 0.2x version of this plugin to
# 	check HP equipment, beware that 0.3 version has "incompatible"
#	change in that it returns human-readable sensor names rather
#       then using HP locale ids to enumerate sensors. If you need
#	old behavior then instead of using '-T hp' as parameter
#	use '-N 1.3.6.1.4.1.232.6.2.6.8.1.3 -D 1.3.6.1.4.1.232.6.2.6.8.1.4'
#
# If you're using some other device then you need to check documentation to
# figure out correct parameters for this plugin, then specify base temperature
# sensor names table OID with '-N' and values table OID with '-D. You also need
# to specify what base sensor temperature data type is with "-i" (see below).
#
# The way plugin works is to walk the snmp tree from base names OID and find
# all the sensor names. Then it compares names given with '-a' (names are
# seperated by ',') to those found in the snmp tree (in '-a' you're expected
# to specify one word which would be found in the full sensor name and
# is unique for thaqt `sensor) and uses OID ending (i.e. part of OID after
# the base) and adds it to base value table OID to create OID to be retrieved
# (similar to how you find ethernet statistics OIDs based on name of the
# interface and in fact many of SNMP parameters are like that).
#
# Note: If you don't know temperature sensor names on your system do:
#         check_snmp_temperature -v -A '*' ...
#       (using '-v' option forces debugging output that should further help)
#
# If your system does not have table with sensor names you can still use
# this plugin if you know exact temperature data OIDs. Then you specify list
# of names sensors should be known by with '-n' option and list of data OIDs
# with '-d' option (this can also be useful if you want to avoid having plugin
# do snmp table walk each time as retrieving specific list of OIDs is faster).
# You will still need to specify what is likely the same sensor names you
# you put in '-n' with '-a' or '-A' option.
#
# Request: If you have an new type of device and as per above you figured
#          out SNMP parameters that work, please send me email with this
#          information so that I can add it as a new system type.
#
# The values retrieved are compared to specified warning and critical values,
# but first the temperature has to be converted from base measurement units to
# measurement units you want. These units are Celsius (C) or Fahrenheit (F)
# or Kelvin (K) with input measurement unit specified with '-i' and output
# specified with '-o'. For input you sometimes have situation where sensor
# reports 10xRealValue, i.e. 33.5C is reported as 335 - this is supported
# too and then input type is specified as '-i 10C'.
#
# Warning and critical values are specified with '-w' and '-c' and each
# one must have exact same number of values (separated by ',') as number
# of sensor names specified with '-a'. Any values you dont want to compare
# you specify as 0 or just not specify (i.e. -w ',50,'). In some cases you
# might not get data for specific sensor and want to substitute default
# value - this is supported with '-u' option (note that default values
# is in fact compared against -w and -c).
#
# Additionally if you want performance output then use '-f' option to get all
# the sensors specified in '-a' or specify particular list of sensors for
# performance data with '-A' (this list can include names not found in '-a').
# A special option of -A '*' will allow to get data from all sensors found
# and is this very useful to find what sensors you have with manual run.
#
# ========================= SETUP EXAMPLES ==================================
#
# define command {
#        command_name check_cisco_temperature
#        command_line $USER1$/check_snmp_temperature.pl -f -H $HOSTADDRESS$ --type=cisco1 -o F -C $ARG1$ -a $ARG2$ -w $ARG3$ -c $ARG4$
# }
#
# define service{
#       use                             std-service
#       hostgroup_name                  cs2948
#       service_description             Temperature
#       check_command                   check_cisco_temperature!foo!Chassis!160!190
# }
#
# define command{
# 	command_name check_dell_temperature
#  	command_line $USER1$/check_snmp_temperature.pl -H $HOSTADDRESS$ -C public \
#    		-N .1.3.6.1.4.1.674.10892.1.700.20.1.8 \
#    		-D .1.3.6.1.4.1.674.10892.1.700.20.1.6 -i 10C -o F -u 0 \
#    		-a ARG1$ -w $ARG2$ -c $ARG3$ -f
# }
#
# define service {
#  	use                     std-service
#  	hostgroup_name          dell_1750
#  	service_description     Temperature
#	check_command		check_dell_temperature!CPU,Ambient,Bottom!110,90,0!135,110,0
# }
#
# For some dell systems with all sensors enabled you can replace the above with:
#       check_command           check_temperature!'CPU,PROC_1,PROC_2,Ambient,Bottom,BMC Planar,BMC Riser'!110,120,120,90,90,105,105!135,140,140,110,110,125,125
#
# ==================== CHANGES/RELEASE, TODO  ==================================
#
# 0.1  - ??? 2006 : Simple plugin where temperature table OIDs were to be
#		    specified directly as parameter. Was used for checking Dell
# 0.2  - Aug 2006 : Support multiple types of equipment by using config
#		    hash/array and --type parameter
# 0.21 - Dec 2006 : Added support for Juniper and HP
# 0.22 - Dec 2006 : Added quick hack to interpret 0 value as "dont' check" threshold
# 0.23 - Dec 2007 : Bug Fixes (especially one involving F as input format)
# 0.3  - Jan 2008 : Added '-n' and '-d' options to specify exact list of
#                   sensor names and oids.
#		    Also when you specify 'hp' type, the plugin will now
#		    provide human-readable sensor names rather then purely
#                   an id of their sensor locale (this is basicly special
#                   hack just for HP since I don't know anyone else who
#                   hard-coded sensor names by ids into SNMP MIB).
# 0.31 - Feb 2008 : Bug fix due to report by Michael Timmers. The issue
#                   was with sensor list that contains a name which matches
#                   by regex with some other later sensor name. In this
#                   case it was Juniper with "Routing Engine" which was
#                   followed by "Routing Engine PCMCIA Card 0" sensor.
# 0.32 - May 2008 : Minor bug fixes. Added baytech pdu SNMP OIDs
# 0.33 - Aug 2008 : Full SNMPv3 support (contrib patch by Nicolas Deffayet)
# 0.34 - Dec 2011 : Bug and small documentation fixes
# 0.35 - Jan 2012 : Added reporting warning and critical threshold to
#		    performance output (as 'name=temperature;warn;crit'
#		    based on what become nagios standard for this info)
# 		    Documentation history and todo updates (added 0.1 & 0.2
#		    versions from below info to above), updated on todo
# 0.36 - Jan 2012 : If data is missing return "UNKNOWN"
#		    Added linux 'lmsensors' as type of device
#		    In order to suppot this you need lmsensors package
#		    and snmpd compiled as:
#			--with-mib-modules="ucd-snmp/lmSensors ucd-snmp/diskio"
# 0.40 (beta) - Mar 2012 :
#                   Imported newest code from check_mysqld 0.93 to support full nagios
#                   threshold specification (including ranges) as well as reporting
#		    of warn/crit threshold in performance data. This changes internal
#                   processing significantly and it needs to be tested more.
# 0.41 - Mar 23, 2013: Fixed bug in parse_threshold function, reported by Charlie Langrall
#		        official release of 0.4 code branch
#
# TODO and older revision history:
#  -- TODO ON TODO --> since most of below is done, it should be cleaned up sometime later
#
# 1. [DONE - Aug 2006] To support multiple types of equipment add config
#    array/hash and --type parameter
# 2. More plugin types for various other equipment need to be added ...
#    [DONE - Dec 2006] - added Juniper & HP
# 3. [DONE - Mar 2012] Need to update warn & crit parameters parsing code so
#    it would support both low and high values with '<' and '>' prefixed and
#    using '~' for don't check rather then 0
#    [DONE - Dec 2006] - added quick hack to interpret empty values
#    (i.e. -w ",90,") as dont check instead of specifying '0' directly
#      Note: Low temperature value checks are rarely needed for network
#            equipment so this is not high priority right now and will
#            be done together with #4 most likely as part of some general
#            library that would be shared with check_snmp_table and quite
#            likely other plugins where multiple "attributes" are specified
# 4. [DONE - Mar 2012] Add threshold specification in nagios plugin spec compatible way
#    as was done with check_mysqld 0.9 which uses code similar to this check
#    Add specifying of WARN & CRIT after actual value ';' in the perf output
#    [DONE - Dec 2011] - added WARN & CRIT to perf, threshold spec still on todo
# 5. Support specifying table OIDs for temperature threshold values.
#    I'll do it only after adding optional file caching so these values
#    can be retrieved about once every day rather then for each check.
# 6. Support directly querying lmsensors on linux system without SNMP
#    plugin would then be renamed to check_temperature similar to check_netint
#
# ========================== START OF PROGRAM CODE ============================

use strict;
use Getopt::Long;

# Nagios specific
our $TIMEOUT;
our %ERRORS;
eval 'use utils qw(%ERRORS $TIMEOUT)';
if ($@) {
 $TIMEOUT = 10;
 %ERRORS = ('OK'=>0,'WARNING'=>1,'CRITICAL'=>2,'UNKNOWN'=>3,'DEPENDENT'=>4);
}

our $no_snmp=0;
eval 'use Net::SNMP';
if ($@) {
  $no_snmp=1;
}

# Below is hash array for several types of equipment, format here is that
# key is name you can specify in "--type" and data for that key is 3-value
# array with 1st value sensor names table OID (-N option), 2nd is sensor
# data table OID (-D option) and 3rd is type of temperature reading (-i)
# Additionally instead of specifying sensor names table OID and sensor data
# root table OID, the first two arguments to array can be "" and then 4th and
# 5th argument should be arrays first with list of sensor names and 2nd with
# list of OIDs for data to be retrieved (see below for how its done for Alteon)
my %system_types = ( "dell" => [ "1.3.6.1.4.1.674.10892.1.700.20.1.8", "1.3.6.1.4.1.674.10892.1.700.20.1.6", "10C" ],
		     "cisco1" => [ "1.3.6.1.4.1.9.9.13.1.3.1.2", "1.3.6.1.4.1.9.9.13.1.3.1.3", "C" ],
		     "cisco" =>  [ "1.3.6.1.4.1.9.9.13.1.3.1.2", "1.3.6.1.4.1.9.9.13.1.3.1.3", "C" ], # same as cisco 1 for now, this may change
		     "juniper" => [ "1.3.6.1.4.1.2636.3.1.13.1.5", "1.3.6.1.4.1.2636.3.1.13.1.7", "C" ], # somebody verify it, dont have juniper right now
		     "hp" => [ "1.3.6.1.4.1.232.6.2.6.8.1.3", "1.3.6.1.4.1.232.6.2.6.8.1.4", "C" ],
		     "alteon" => [ "", "", "C", ['RearLeftSensor', 'RearMiddleSensor', 'FrontMiddleSensor', 'FrontRightSensor'], ['1.3.6.1.4.1.1872.2.1.1.6.0','1.3.6.1.4.1.1872.2.1.1.7.0','1.3.6.1.4.1.1872.2.1.1.8.0','1.3.6.1.4.1.1872.2.1.1.9.0'] ], # why do they need to make these alteons so proprietory and hard to deal with?
		     "baytech" => [ "1.3.6.1.4.1.4779.1.3.5.2.1.2", "1.3.6.1.4.1.4779.1.3.5.2.1.8", "10C" ],  # baytech pdu
		     "lmsensors" => [ "1.3.6.1.4.1.2021.13.16.2.1.2", "1.3.6.1.4.1.2021.13.16.2.1.3", "1000C" ], #linux with lmsensors
		     "linux" => [ "1.3.6.1.4.1.2021.13.16.2.1.2", "1.3.6.1.4.1.2021.13.16.2.1.3", "1000C" ],
		   );
# APC OID for the temperature is .1.3.6.1.4.1.318.1.1.2.1.1.0
# APC OID for the humidity is .1.3.6.1.4.1.318.1.1.2.1.2.0
# Cisco fans: .1.3.6.1.4.1.9.9.13.1.4.1.3
# HP switch temperature : .1.3.6.1.4.1.11.2.14.11.1.2.6.1.4.4
# HP switch fan: .1.3.6.1.4.1.11.2.14.11.1.2.6.1.4.1

my $Version='0.40';

my $o_host=     undef;          # hostname
my $o_community= undef;         # community
my $o_port=     161;            # SNMP port
my $o_help=     undef;          # help option
my $o_verb=     undef;          # verbose mode
my $o_version=  undef;          # version info option
my $o_warn=     undef;          # warning level option
my @o_warnL=    ();             # array for above list
my $o_crit=     undef;          # Critical level option
my @o_critL=    ();             # array for above list
my $o_perf=     undef;          # Performance data option
my $o_timeout=  5;              # Default 5s Timeout
my $o_version2= undef;          # use snmp v2c
# SNMPv3 specific
my $o_login=	undef;		# Login for snmpv3
my $o_passwd=	undef;		# Pass for snmpv3
my $v3protocols=undef;		# V3 protocol list.
my $o_authproto='md5';		# Auth protocol
my $o_privproto='des';		# Priv protocol
my $o_privpass= undef;		# priv password

my $o_attr=	undef;  	# What attribute(s) to check (specify more then one separated by '.')
my @o_attrL=    ();             # array for above list
my $o_perfattr= undef;		# List of attributes to only provide values in performance data but no checking
my @o_perfattrL=();		# array for above list
my $o_ounit= 	'C';		# Output Temperature Measurement Units - can be 'C', 'F' or 'K'
my $o_iunit=	'C';		# Incoming Temperature Measurement Units - can prefix with number if its n*temp
my $oid_names=	undef;		# OID for base of sensor attribute names
my $oid_data=	undef;		# OID for base of actual data for those attributes found when walking name base
my $o_names=	undef;		# List of sensor names (as opposed to specifying names table)
my $o_unkdef=	undef;		# Default value to report for unknown attributes
my $o_type=	undef;		# Type of system to check (predefined values for $oid_names, $oid_data, $oid_iunit)
my $o_sensornames=undef;	# Option specifying list of sensor names that then go into @ar_sensornames array
my $o_sensoroids=undef;		# Option specifying list of sensor oids that then go into @ar_sensoroids array
my @ar_sensornames=();		# List of sensor names if specified in the sensor_types array
my @ar_sensoroids=();		# List of sensor data oids if specified in sensor_types array

# This is hack for HP based on cpqHeTemperatureLocale OID from cpqhlth.mib to map reported locale id to real name
my %hp_locale =  ( 1=> ['OTHER',1], 2=> ['UNKNOWN',1],  3=> ['System', 1], 4=> ['SystemBoard',1], 5=> ['ioBoard',1],
		   6=> ['CPU',1], 7=> ['Memory',1], 8=> ['Storage',1], 9=> ['RemovableMedia',1],
		   10=> ['PowerSupply',1], 11=> ['Ambient',1], 12=> ['Chassis',1], 13=> ['BridgeCard',1] );

sub print_version { print "$0: $Version\n" };

sub print_usage {
	print "Usage: $0 [-v] -H <host> -C <snmp_community> [-2] | (-l login -x passwd [-X pass -L <authp>,<privp>])  [-p <port>] [-t <timeout>] -T dell|hp|cisco1|juniper|alteon|lmsensors | [-N <oid_attribnames> -D <oid_attribdata>] | [-n <list of sensor names> -d <list of sensor oids>] [-a <attributes to check> -w <warn levels> -c <crit levels> [-f]] [-A <attributes for perfdata>] [-o <out_temp_unit: C|F|K>] [-i <in_temp_unit>] [-u <unknown_default>] [-V]\n";
}

# Return true if arg is a number
sub isnum {
	my $num = shift;
	if ( $num =~ /^(\d+\.?\d*)|(^\.\d+)$/ ) { return 1 ;}
	return 0;
}

# function used when checking data against critical and warn values
sub check_threshold {
    my ($attrib, $data, $th_array, $o_ounit) = @_;
    my $mod = $th_array->[0];
    my $lv1 = $th_array->[1];
    my $lv2 = $th_array->[2];

    # verb("debug check_threshold: $mod : ".(defined($lv1)?$lv1:'')." : ".(defined($lv2)?$lv2:''));
    return "" if !defined($lv1) || ($mod eq '' && $lv1 eq '');
    return " " . $attrib . " Temperature is " . $data . $o_ounit . " = " . $lv1.$o_ounit if $mod eq '=' && $data eq $lv1;
    return " " . $attrib . " Temperature is " . $data . $o_ounit . " != " . $lv1.$o_ounit if $mod eq '!' && $data ne $lv1;
    return " " . $attrib . " Temperature is " . $data . $o_ounit . " > " . $lv1.$o_ounit if $mod eq '>' && $data>$lv1;
    return " " . $attrib . " Temperature is " . $data . $o_ounit . " > " . $lv2.$o_ounit if $mod eq ':' && $data>$lv2;
    return " " . $attrib . " Temperature is " . $data . $o_ounit . " >= ". $lv1.$o_ounit if $mod eq '>=' && $data>=$lv1;
    return " " . $attrib . " Temperature is " . $data . $o_ounit . " < "  . $lv1.$o_ounit if ($mod eq '<' || $mod eq ':') && $data<$lv1;
    return " " . $attrib . " Temperature is " . $data . $o_ounit . " <= " . $lv1.$o_ounit if $mod eq '<=' && $data<=$lv1;
    return " " . $attrib . " Temperature is " . $data . $o_ounit ." in range ". $lv1.$o_ounit."..".$lv2.$o_ounit if $mod eq '@' && $data>=$lv1 && $data<=$lv2;
    return "";
}

# function called when parsing threshold options data
sub parse_threshold {
    my $thin = shift;

    # link to an array that holds processed threshold data
    # array: 1st is type of check, 2nd is value2, 3rd is value2, 4th is option, 5th is nagios spec string representation for perf out
    my $th_array = [ '', undef, undef, '', '' ];
    my $th = $thin;
    my $at = '';

    # take 3 ways to specify that there is no threshold
    return $th_array if ($th eq '0' || $th eq '~' || $th eq '');

    $at = $1 if $th =~ s/^(\^?[@|>|<|=|!]?~?)//; # check mostly for my own threshold format
    $th_array->[3]='^' if $at =~ s/\^//; # deal with ^ option
    $at =~ s/~//; # ignore ~ if it was entered
    if ($th =~ /^\:([-|+]?\d+\.?\d*)/) { # :number format per nagios spec
	$th_array->[1]=$1;
	$th_array->[0]=($at !~ /@/)?'>':'<=';
	$th_array->[5]=($at !~ /@/)?('~:'.$th_array->[1]):($th_array->[1].':');
    }
    elsif ($th =~ /([-|+]?\d+\.?\d*)\:$/) { # number: format per nagios spec
        $th_array->[1]=$1;
	$th_array->[0]=($at !~ /@/)?'<':'>=';
	$th_array->[5]=($at !~ /@/)?'':'@';
	$th_array->[5].=$th_array->[1].':';
    }
    elsif ($th =~ /([-|+]?\d+\.?\d*)\:([-|+]?\d+\.?\d*)/) { # nagios range format
	$th_array->[1]=$1;
	$th_array->[2]=$2;
	if ($th_array->[1] > $th_array->[2]) {
                print "Incorrect format in '$thin' - in range specification first number must be smaller then 2nd\n";
                print_usage();
                exit $ERRORS{"UNKNOWN"};
	}
	$th_array->[0]=($at !~ /@/)?':':'@';
	$th_array->[5]=($at !~ /@/)?'':'@';
	$th_array->[5].=$th_array->[1].':'.$th_array->[2];
    }
    if (!defined($th_array->[1])) {
	$th_array->[0] = ($at eq '@')?'<=':$at;
	$th_array->[1] = $th;
	$th_array->[5] = '~:'.$th_array->[1] if ($th_array->[0] eq '>' || $th_array->[0] eq '>=');
	$th_array->[5] = $th_array->[1].':' if ($th_array->[0] eq '<' || $th_array->[0] eq '<=');
	$th_array->[5] = '@'.$th_array->[1].':'.$th_array->[1] if $th_array->[0] eq '=';
	$th_array->[5] = $th_array->[1].':'.$th_array->[1] if $th_array->[0] eq '!';
    }
    if ($th_array->[0] =~ /[>|<]/ && !isnum($th_array->[1])) {
	print "Numeric value required when '>' or '<' are used !\n";
        print_usage();
        exit $ERRORS{"UNKNOWN"};
    }
    # verb("debug parse_threshold: $th_array->[0] and $th_array->[1]");
    $th_array->[0] = '=' if !$th_array->[0] && !isnum($th_array->[1]) && $th_array->[1] ne '';
    if (!$th_array->[0] && isnum($th_array->[1])) { # this is just the number by itself, becomes 0:number check per nagios guidelines
	$th_array->[2]=$th_array->[1];
	$th_array->[1]=0;
	$th_array->[0]=':';
        $th_array->[5]=$th_array->[2];
    }
    return $th_array;
}

# this function checks that for numeric data warn threshold is within range of critical threshold
# where within range depends on actual threshold spec and normally just means less
sub threshold_specok {
    my ($warn_thar,$crit_thar) = @_;
    return 0 if (defined($warn_thar->[1]) && !isnum($warn_thar->[1])) || (defined($crit_thar->[1]) && !isnum($crit_thar->[1]));
    return 1 if defined($warn_thar) && defined($warn_thar->[1]) &&
                defined($crit_thar) && defined($crit_thar->[1]) &&
                isnum($warn_thar->[1]) && isnum($crit_thar->[1]) &&
                $warn_thar->[0] eq $crit_thar->[0] &&
                (!defined($warn_thar->[3]) || $warn_thar->[3] !~ /\^/) &&
                (!defined($crit_thar->[3]) || $crit_thar->[3] !~ /\^/) &&
              (($warn_thar->[1]>$crit_thar->[1] && ($warn_thar->[0] =~ />/ || $warn_thar->[0] eq '@')) ||
               ($warn_thar->[1]<$crit_thar->[1] && ($warn_thar->[0] =~ /</ || $warn_thar->[0] eq ':')) ||
               ($warn_thar->[0] eq ':' && $warn_thar->[2]>=$crit_thar->[2]) ||
               ($warn_thar->[0] eq '@' && $warn_thar->[2]<=$crit_thar->[2]));
    return 0;  # return with 0 means specs check out and are ok
}

sub help {
	print "\nSNMP Temperature Monitor for Nagios version ",$Version,"\n";
	print " by William Leibzon - william(at)leibzon.org\n\n";
	print_usage();
	print <<EOD;
-v, --verbose
	print extra debugging information
-h, --help
	print this help message
-H, --hostname=HOST
	name or IP address of host to check
-C, --community=COMMUNITY NAME
	community name for the host's SNMP agent (implies v 1 protocol)
-2, --v2c
   Use snmp v2c
-l, --login=LOGIN ; -x, --passwd=PASSWD
   Login and auth password for snmpv3 authentication
   If no priv password exists, implies AuthNoPriv
-X, --privpass=PASSWD
   Priv password for snmpv3 (AuthPriv protocol)
-L, --protocols=<authproto>,<privproto>
   <authproto> : Authentication protocol (md5|sha : default md5)
   <privproto> : Priv protocole (des|aes : default des)
-P, --port=PORT
   SNMP port (Default 161)
-w, --warn=INT[,INT[,INT[..]]]
	Warning temperature level(s). The number of values listed here must exactly match number
        of sensors listed with '-a'. The values specifify threshold for when Nagios should send
        WARNING alert. All values are numbers and can have the following prefix modifiers:
           > - warn if data is above this value (default for numeric values)
           < - warn if data is below this value (must be followed by number)
           = - warn if data is equal to this value (default for non-numeric values)
           ! - warn if data is not equal to this value
           ~ - do not check this data (must not be followed by number or ':')
           ^ - this disables check that warning < critical
        Threshold values can also be specified as range in two forms:
           num1:num2  - warn if data is outside range i.e. if data<num1 or data>num2
           \@num1:num2 - warn if data is in range i.e. data>=num1 && data<=num2
-c, --crit=INT[,INT[,INT[..]]]
	Critical temperature level(s) (if more then one attribute is checked, must have multiple values)
        The format is the same as with warning threshold levels.
-f, --perfdata
	Perfparse compatible output
-t, --timeout=INTEGER
	timeout for SNMP in seconds (Default: 5)
-V, --version
	prints version number
-N, --oidtable_attribnames=OID_STRING
	Base table OID to walk through to find names of those attributes supported and from that corresponding data OIDs
-D, --oidtable_attribdata=OID_STRING
	Base table OID for sensor attribute data, one number is added to that to make up full attribute OID
-n, --sensor_names=STRING[,STRING[..]]
        List of sensor names when -N is not used and sensors are specified with exeact oids
-d, --sensor_oids=OID_STRING[,OID_STRING[..]]
	List of exact data OIDs for sensors specified with -n (specify this when -N and -D are not used)
-a, --attributes=STRING[,STRING[..]]
	Which attribute(s) to check. This is used as regex to check if attribute is found in sensor names.
	As an example for Dell the attribute names to use are: PROC_1, PROC_2, Ambient, Planar, Riser
-A, --perf_attributes=STRING[,STRING[..]]
	Which attribute(s) to add to as part of performance data output. These names can be different then the
	ones listed in '-a' to only output attributes in perf data but not check. Special value of '*' gets them all.
-f, --perfparse
        Used only with '-a'. Causes to output data not only in main status line but also as perfparse output
-o  --out_temp_unit=C|F|K
	What temperature measurement units are used for output and warning/critical - 'C', 'F' or 'K' - default is 'C'
-i  --in_temp_unit=[num]C|F|K
	What temperature measurement reported by data OID - format is <num>C|F|K (default is 'C')
 	where num is used if data is num*realdata, i.e. if reported data of 330 means 33C, then it is: -i 10C
-u, --unknown_default=INT
        If attribute is not found then report the output as this number (i.e. -u 0)
-T, --type=dell|hp|cisco1|juniper|alteon|lmsensors
	This allows to use pre-defined system type to set Base, Data OIDs and incoming temperature measurement type
	Currently support systems types are: dell, hp, cisco1 (7500, 5500, 2948, etc), juniper, alteon, lmsensors (linux using lmsensors package if snmp is compiled to support it)
EOD
}

# For verbose output - don't use it right now
sub verb { my $t=shift; print $t,"\n" if defined($o_verb) ; }

# Get the alarm signal (just in case snmp timout screws up)
$SIG{'ALRM'} = sub {
     print ("ERROR: Alarm signal (Nagios time-out)\n");
     exit $ERRORS{"UNKNOWN"};
};

# converts temperature from input format unit into output format units
sub convert_temp {
    my ($temp, $in_unit, $out_unit) = @_;

    my $in_mult = 1;
    my $ctemp = undef;
    $in_mult = $1 if $in_unit =~ /(\d+)\w/;
    $in_unit =~ s/\d+//;

    # exit quickly avoiding conversion to and from C if both units are the same
    return $temp / $in_mult if ($in_unit eq $out_unit);
    # if units are not the same, we convert to/from C
    $ctemp = $temp / $in_mult if $in_unit eq 'C';
    $ctemp = ($temp / $in_mult - 32) / 1.8 if $in_unit eq 'F';
    $ctemp = $temp / $in_mult - 273.15 if $in_unit eq 'K';
    $ctemp = $temp / $in_mult if !defined($ctemp);
    return $ctemp if $out_unit eq "C";
    return $ctemp * 1.8 + 32 if $out_unit eq "F";
    return $ctemp + 273.15 if $out_unit eq "K";
    return $ctemp; # should not get here
}

sub check_options {
    Getopt::Long::Configure ("bundling");
    GetOptions(
        'v'     => \$o_verb,            'verbose'       => \$o_verb,
        'h'     => \$o_help,            'help'          => \$o_help,
        'H:s'   => \$o_host,            'hostname:s'    => \$o_host,
        'P:i'   => \$o_port,            'port:i'        => \$o_port,
        'C:s'   => \$o_community,       'community:s'   => \$o_community,
	'l:s'	=> \$o_login,		'login:s'	=> \$o_login,
	'x:s'	=> \$o_passwd,		'passwd:s'	=> \$o_passwd,
	'X:s'	=> \$o_privpass,		'privpass:s'	=> \$o_privpass,
	'L:s'	=> \$v3protocols,		'protocols:s'	=> \$v3protocols,
        't:i'   => \$o_timeout,         'timeout:i'     => \$o_timeout,
        'V'     => \$o_version,         'version'       => \$o_version,
        '2'     => \$o_version2,        'v2c'           => \$o_version2,
        'c:s'   => \$o_crit,            'critical:s'    => \$o_crit,
        'w:s'   => \$o_warn,            'warn:s'        => \$o_warn,
        'f'     => \$o_perf,            'perfparse'      => \$o_perf,
        'a:s'   => \$o_attr,         	'attributes:s' 	=> \$o_attr,
	'A:s'	=> \$o_perfattr,	'perf_attributes:s' => \$o_perfattr,
	'o:s'	=> \$o_ounit,		'out_temp_unit:s' => \$o_ounit,
	'i:s'	=> \$o_iunit,		'in_temp_unit:s' => \$o_iunit,
	'u:i'	=> \$o_unkdef,		'unknown_default:i' => \$o_unkdef,
	'N:s'	=> \$oid_names,		'oid_attribnames:s' => \$oid_names,  'oidtable_attribnames:s' => \$oid_names,
	'D:s'	=> \$oid_data,		'oid_attribdata:s'  => \$oid_data,   'oidtable_attribdata:s'  => \$oid_data,
	'n:s'   => \$o_sensornames,	'sensor_names:s' => \$o_sensornames,
	'd:s'   => \$o_sensoroids,	'sensor_oids:s'  => \$o_sensoroids,
	'T:s'   => \$o_type,		'type:s'	=> \$o_type
    );
    if (defined($o_help) ) { help(); exit $ERRORS{"UNKNOWN"}; }
    if (defined($o_version)) { print_version(); exit $ERRORS{"UNKNOWN"}; }
    if ($no_snmp) {
        print "Can't locate Net/SNMP.pm\n"; print_usage(); exit $ERRORS{"UNKNOWN"};
    }
    if (! defined($o_host)) { # check host and filter
        print "No host defined!\n";print_usage(); exit $ERRORS{"UNKNOWN"};
    }
    # check snmp information
    if ( !defined($o_community) && (!defined($o_login) || !defined($o_passwd)) )
	  { print "Put snmp login info!\n"; print_usage(); exit $ERRORS{"UNKNOWN"}}
	if ((defined($o_login) || defined($o_passwd)) && (defined($o_community) || defined($o_version2)) )
	  { print "Can't mix snmp v1,2c,3 protocols!\n"; print_usage(); exit $ERRORS{"UNKNOWN"}}
	if (defined ($v3protocols)) {
	  if (!defined($o_login)) { print "Put snmp V3 login info with protocols!\n"; print_usage(); exit $ERRORS{"UNKNOWN"}}
	  my @v3proto=split(/,/,$v3protocols);
	  if ((defined ($v3proto[0])) && ($v3proto[0] ne "")) {$o_authproto=$v3proto[0];	}	# Auth protocol
	  if (defined ($v3proto[1])) {$o_privproto=$v3proto[1];	}	# Priv  protocol
	  if ((defined ($v3proto[1])) && (!defined($o_privpass))) {
	    print "Put snmp V3 priv login info with priv protocols!\n"; print_usage(); exit $ERRORS{"UNKNOWN"}}
	}
    $o_ounit =~ tr/[a-z]/[A-Z]/;
    if ($o_ounit ne 'C' && $o_ounit ne 'F' && $o_ounit ne 'K')
	{ print "Invalid output measurement unit specified!\n"; print_usage(); exit $ERRORS{"UNKNOWN"}; }
    $o_iunit =~ tr/[a-z]/[A-Z]/;
    if ($o_iunit !~ /\d*[C|K|F]/)
	{ print "Invalid input measurement unit specified!\n"; print_usage(); exit $ERRORS{"UNKNOWN"}; }
    if (defined ($o_type)) {
	if (defined($oid_names) || defined($oid_data) || defined($o_sensornames) || defined($o_sensoroids))
	   { print "Please either specify specify system type (-T) OR base SNMP OIDs for name (-N) and data (-D) tables OR exact list of sensor names (-n) and data OIDs (-d) !\n"; print_usage(); exit $ERRORS{"UNKNOWN"}; }
	if (defined($system_types{$o_type})) {
	   $oid_names = $system_types{$o_type}[0];
	   $oid_data = $system_types{$o_type}[1];
	   $o_iunit = $system_types{$o_type}[2];
	   @ar_sensornames= @{$system_types{$o_type}[3]} if defined($system_types{$o_type}[3]) && !$oid_names;
	   @ar_sensoroids= @{$system_types{$o_type}[4]} if defined($system_types{$o_type}[4]) && !$oid_data;
	}
	else { print "Unknown system type $o_type !\n"; print_usage(); exit $ERRORS{"UNKNOWN"}; }
    }
    if (defined($o_sensornames) && defined($o_sensoroids)) {
	if (defined($oid_names) || defined($oid_data)) {
	   print "You can not combine -n / -d options with -N / -D\n"; print_usage(); exit $ERRORS{"UNKNOWN"};
	}
	else {
	   @ar_sensornames = split(/,/, $o_sensornames);
	   @ar_sensoroids = split(/,/, $o_sensoroids);
	   if (scalar(@ar_sensornames) != scalar(@ar_sensoroids)) {
		printf "Number of sensor names specified at -n (%d) must be equal to number of data OIDs specified with -d (%d)\n",
		   scalar(@ar_sensornames), scalar(@ar_sensoroids);
		print_usage();
		exit $ERRORS{"UNKNOWN"};
	   }
	}
    }
    if (scalar(@ar_sensornames)==0 && scalar(@ar_sensoroids)==0 && !(defined($oid_names) && defined($oid_data)))
	{ print "Specify system type (-T) OR base SNMP OIDs for names (-N) and data (-D) tables OR exact list of sensor names (-n) and data OIDs (-d) !\n"; print_usage(); exit $ERRORS{"UNKNOWN"}; }

    # below code is common for number of my plugins, including check_snmp_?, netstat, etc
    # it is mostly compliant with nagios threshold specification (except use of '~')
    # and adds number of additional format options using '>','<','!','=' prefixes
    my (@ar_warnLv,@ar_critLv);
    if (defined($o_perfattr)) {
        @o_perfattrL=split(/,/ ,$o_perfattr);
    }
    if (defined($o_warn) || defined($o_crit) || defined($o_attr)) {
        if (defined($o_attr)) {
          @o_attrL=split(/,/, $o_attr);
	  if (defined($o_warn)) {
	     $o_warn.="~" if $o_warn =~ /,$/;
	     @ar_warnLv=split( /,/ , lc $o_warn );
	  }
	  if (defined($o_crit)) {
	     $o_crit.="~" if $o_crit =~ /,$/;
    	     @ar_critLv=split( /,/ , lc $o_crit );
	  }
	}
	else {
	  print "Specifying warning and critical levels requires '-a' parameter with list of STATUS variables\n";
	  print_usage();
	  exit $ERRORS{"UNKNOWN"};
        }
	if (scalar(@ar_warnLv)!=scalar(@o_attrL) || scalar(@ar_critLv)!=scalar(@o_attrL)) {
	  printf "Number of specified warning levels (%d) and critical levels (%d) must be equal to the number of attributes specified at '-a' (%d). If you need to ignore some attribute do it as ',,'\n", scalar(@ar_warnLv), scalar(@ar_critLv), scalar(@o_attrL);
	  verb("Warning Levels: ".join(",",@ar_warnLv));
	  verb("Critical Levels: ".join(",",@ar_critLv));
	  print_usage();
	  exit $ERRORS{"UNKNOWN"};
	}
	for (my $i=0; $i<scalar(@o_attrL); $i++) {
          $o_warnL[$i] = parse_threshold($ar_warnLv[$i]);
          $o_critL[$i] = parse_threshold($ar_critLv[$i]);
	  if (threshold_specok($o_warnL[$i],$o_critL[$i])) {
                 print "Numeric value required for warning and critical thresholds!\n";
		 print "And warning must be less then critical (or greater then when '<' is used)\n";
                 print "(to override warning<critical check prefix warning value with ^)\n";
                 print_usage();
                 exit $ERRORS{"UNKNOWN"};
           }
	}
    }
   if (scalar(@o_attrL)==0 && scalar(@o_perfattrL)==0) {
        print "You must specify list of attributes with either '-a' or '-A'\n";
        print_usage();
        exit $ERRORS{"UNKNOWN"};
    }
}

########## MAIN #######

check_options();

# Check global timeout if something goes wrong
if (defined($TIMEOUT)) {
  verb("Alarm at $TIMEOUT");
  alarm($TIMEOUT);
} else {
  verb("no global timeout defined : $o_timeout + 10");
  alarm ($o_timeout+10);
}

# Connect to host
my ($session,$error);
if ( defined($o_login) && defined($o_passwd)) {
  # SNMPv3 login
  verb("SNMPv3 login");
  if (!defined ($o_privpass)) {
    verb("SNMPv3 AuthNoPriv login : $o_login, $o_authproto");
    ($session, $error) = Net::SNMP->session(
      -hostname   	=> $o_host,
      -version		=> '3',
      -username		=> $o_login,
      -authpassword	=> $o_passwd,
      -authprotocol	=> $o_authproto,
      -timeout          => $o_timeout
    );
  } else {
    verb("SNMPv3 AuthPriv login : $o_login, $o_authproto, $o_privproto");
    ($session, $error) = Net::SNMP->session(
      -hostname   	=> $o_host,
      -version		=> '3',
      -username		=> $o_login,
      -authpassword	=> $o_passwd,
      -authprotocol	=> $o_authproto,
      -privpassword	=> $o_privpass,
      -privprotocol => $o_privproto,
      -timeout          => $o_timeout
    );
  }
} else {
  if (defined ($o_version2)) {
    # SNMPv2 Login
    verb("SNMP v2c login");
    ($session, $error) = Net::SNMP->session(
      -hostname  => $o_host,
      -version   => 2,
      -community => $o_community,
      -port      => $o_port,
      -timeout   => $o_timeout
    );
  } else {
    # SNMPV1 login
    verb("SNMP v1 login");
    ($session, $error) = Net::SNMP->session(
      -hostname  => $o_host,
      -community => $o_community,
      -port      => $o_port,
      -timeout   => $o_timeout
    );
  }
}
if (!defined($session)) {
   printf("ERROR opening session: %s.\n", $error);
   exit $ERRORS{"UNKNOWN"};
}

# next part of the code builds list of attributes to be retrieved
my $i;
my $oid;
my $line;
my $attr;
my @varlist = ();
my %dataresults;
my $result;

for ($i=0;$i<scalar(@o_attrL);$i++) {
  $dataresults{$o_attrL[$i]} = ["check", undef, undef, 0, 0];
}
if (defined($o_perfattr) && $o_perfattr ne '*') {
  for ($i=0;$i<scalar(@o_perfattrL);$i++) {
    $dataresults{$o_perfattrL[$i]} = ["perf", undef, undef, 0, 0];
  }
}

if (scalar(@ar_sensornames)==0) {
    verb("Retrieving SNMP table $oid_names to find sensor attribute names");
    $result = $session->get_table( -baseoid => $oid_names );
    if (!defined($result)) {
        printf("ERROR: Problem retrieving OID %s table: %s.\n", $oid_names, $session->error);
        $session->close();
        exit $ERRORS{"UNKNOWN"};
    }
    L1: foreach $oid (Net::SNMP::oid_lex_sort(keys %{$result})) {
        $line=$result->{$oid};
        verb("got $oid : $line");
	# special hack for HP
	if (defined($o_type) && $o_type eq 'hp' && exists($hp_locale{$line})) {
		$line = $hp_locale{$result->{$oid}}[0] ."_". $hp_locale{$result->{$oid}}[1];
		$hp_locale{$result->{$oid}}[1]++;
		verb("HP hack: interpreting ".$result->{$oid}." as $line");
	}	
        if (defined($o_perfattr) && $o_perfattr eq '*') {
                $oid =~ s/$oid_names/$oid_data/;
                $dataresults{$line} = ["perf", $oid, undef, 0, 0];
                unshift(@varlist,$oid);
                verb("match found based on -A '*', now set to retrieve $oid");
        }
	foreach $attr (keys %dataresults) {
	   if ($line =~ /$attr/ && !defined($dataresults{$attr}[1])) {
		$oid =~ s/$oid_names/$oid_data/;
		$dataresults{$attr}[1] = $oid;
		unshift(@varlist,$oid) if !defined($varlist[0]) || $varlist[0] ne $oid;
		verb("match found for $attr, now set to retrieve $oid");
		next L1;
	   }
	}
    }
}
else {
    my $i;
    for ($i=0;$i<scalar(@ar_sensornames);$i++) {
	$line=$ar_sensornames[$i];
	$oid=$ar_sensoroids[$i];
        if (defined($o_perfattr) && $o_perfattr eq '*') {
                $dataresults{$line} = ["perf", $oid, undef, 0, 0];
                unshift(@varlist,$oid);
                verb("match found based on -A '*', now set to retrieve $oid");
        }
        L2: foreach $attr (keys %dataresults) {
           if ($line =~ /$attr/ && !defined($dataresults{$attr}[1])) {
                $dataresults{$attr}[1] = $oid;
                unshift(@varlist,$oid) if !defined($varlist[0]) || $varlist[0] ne $oid;
                verb("match found for $attr, now set to retrieve $oid");
                next L2;
           }
        }
    }
}

# now we actually retrieve the attributes
my $statuscode = "OK";
my $statusinfo = "";
my $statusdata = "";
my $perfdata = "";
my $chk = "";

verb("Getting SNMP data for oids" . join(" ",@varlist));
$result = $session->get_request(
	-Varbindlist => \@varlist
);
if (!defined($result)) {
        printf("ERROR: Can not retrieve OID(s) %s: %s.\n", join(" ",@varlist), $session->error);
        $session->close();
        exit $ERRORS{"UNKNOWN"};
}
else {
	foreach $attr (keys %dataresults) {
	    if (defined($dataresults{$attr}[1]) && defined($$result{$dataresults{$attr}[1]})) {
		$dataresults{$attr}[2]=convert_temp($$result{$dataresults{$attr}[1]},$o_iunit,$o_ounit);
		verb("got $dataresults{$attr}[1] : $attr = $dataresults{$attr}[2]");
	    }
	    else {
		if (defined($o_unkdef)) {
		   $dataresults{$attr}[2]=$o_unkdef;
		   verb("could not find snmp data for $attr, setting to to default value $o_unkdef");
		}
		else {
		   verb("could not find snmp data for $attr");
		}
	    }
	}
}

# loop to check if warning & critical attributes are ok
for ($i=0;$i<scalar(@o_attrL);$i++) {
  if (defined($dataresults{$o_attrL[$i]}[2])) {
    if ($chk = check_threshold($o_attrL[$i],$dataresults{$o_attrL[$i]}[2],$o_critL[$i],$o_ounit)) {
	$dataresults{$o_attrL[$i]}[3]++;
	$statuscode = "CRITICAL";
        $statusinfo .= $chk;
    }
    elsif ($chk = check_threshold($o_attrL[$i],$dataresults{$o_attrL[$i]}[2],$o_warnL[$i],$o_ounit)) {
	$dataresults{$o_attrL[$i]}[3]++;
	$statuscode="WARNING" if $statuscode eq "OK";
	$statusinfo .= $chk;
    }
    if ($dataresults{$o_attrL[$i]}[3]==0) {
	  $dataresults{$o_attrL[$i]}[3]++;
	  $statusdata .= "," if ($statusdata);
	  $statusdata .= " " . $o_attrL[$i] . " Temperature is " . $dataresults{$o_attrL[$i]}[2] . $o_ounit;
    }
    if (defined($o_perf) && $dataresults{$o_attrL[$i]}[4]==0 &&
        defined($o_warnL[$i][5]) && defined($o_critL[$i][5])) {
	  $dataresults{$o_attrL[$i]}[4]++;
          $perfdata .= " " . $o_attrL[$i] . "=" . $dataresults{$o_attrL[$i]}[2];
	  $perfdata .= ';' if $o_warnL[$i][5] ne '' || $o_critL[$i][5] ne '';
	  $perfdata .= $o_warnL[$i][5] if $o_warnL[$i][5] ne '';
	  $perfdata .= ';'.$o_critL[$i][5] if $o_critL[$i][5] ne '';
    }
  }
  else {
	$statusdata .= "," if ($statusdata);
        $statusdata .= " $o_attrL[$i] data is missing";
	$statuscode = "UNKNOWN" if $statuscode eq "OK";
  }
}

# add data for performance-only attributes
if (defined($o_perfattr) && $o_perfattr eq '*') {
  foreach $attr (keys %dataresults) {
     if ($dataresults{$attr}[0] eq "perf" && defined($dataresults{$attr}[2]) && $dataresults{$attr}[4]==0) {
        $dataresults{$attr}[4]++;
	$perfdata .= " " . $attr . "=" . $dataresults{$attr}[2];
     }
  }
}
else {
  for ($i=0;$i<scalar(@o_perfattrL);$i++) {
     if (defined($dataresults{$o_perfattrL[$i]}[2]) && $dataresults{$o_perfattrL[$i]}[4]==0) {
	$dataresults{$o_perfattrL[$i]}[4]++;
	$perfdata .= " " . $o_perfattrL[$i] . "=" . $dataresults{$o_perfattrL[$i]}[2];
     }
  }
}

$session->close;
print $statuscode . $statusinfo;
print " -".$statusdata if $statusdata;
print " |".$perfdata if $perfdata;
print "\n";

exit $ERRORS{$statuscode};