check_ipmi_sensor

#!/usr/bin/perl
# check_ipmi_sensor: Nagios/Icinga plugin to check IPMI sensors
#
# Copyright (C) 2009-2019 Thomas-Krenn.AG,
# additional contributors see changelog.txt
#
# 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 3 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, see <http://www.gnu.org/licenses/>.
#
################################################################################
# The following guides provide helpful information if you want to extend this
# script:
#   http://tldp.org/LDP/abs/html/ (Advanced Bash-Scripting Guide)
#   http://www.gnu.org/software/gawk/manual/ (Gawk: Effective AWK Programming)
#   http://de.wikibooks.org/wiki/Awk (awk Wikibook, in German)
#   http://nagios.sourceforge.net/docs/3_0/customobjectvars.html (hints on
#                  custom object variables)
#   http://nagiosplug.sourceforge.net/developer-guidelines.html (plug-in
#                  development guidelines)
#   http://nagios.sourceforge.net/docs/3_0/pluginapi.html (plugin API)
################################################################################
use strict;
use warnings;
use Getopt::Long qw(:config no_ignore_case);
use IPC::Run qw( run ); #interact with processes
################################################################################
# set text variables
our $check_ipmi_sensor_version = "3.13";

sub get_version{
	return <<EOT;
check_ipmi_sensor version $check_ipmi_sensor_version
Copyright (C) 2009-2019 Thomas-Krenn.AG
Current updates at https://github.com/thomas-krenn/check_ipmi_sensor_v3.git
EOT
}

sub get_usage{
	return <<EOT;
Usage:
check_ipmi_sensor -H <hostname>
  [-f <FreeIPMI config file> | -U <username> -P <password> -L <privilege level>]
  [-O <FreeIPMI options>] [-b] [-T <sensor type(s)>] [-ST <SEL sensor type(s)>]
  [-x <sensor id>] [-xT <sensor type(s)>] [-xST <SEL sensor type(s)]
  [-i <sensor id>] [-o zenoss] [-D <protocol LAN version>] [-h] [-V]
  [-fc <num_fans>] [--fru] [--assettag] [--board] [--nosel] [--selonly] 
  [--seltail <count>] [-sx|--selexclude <sel exclude file>] 
  [-xx|--sexclude <exclude file>] [-us|--unify-sensors <unify file>] [--nosudo [--nothresholds]
  [--noentityabsent] [-s <ipmi-sensor output file>] [-h] [-V]
  [-v|-vv|-vvv]
EOT
}

sub get_help{
	return <<EOT;
  [-H <hostname>]
       hostname or IP of the IPMI interface.
       For \"-H localhost\" or if no host is specified (local computer) the
       Nagios/Icinga user must be allowed to run
       ipmimonitoring/ipmi-sensors/ipmi-sel/[ipmi-fru] with root privileges
       or via sudo (ipmimonitoring/ipmi-sensors/ipmi-sel/[ipmi-fru] must be
       able to access the IPMI devices via the IPMI system interface).
  [-f <FreeIPMI config file>]
       path to the FreeIPMI configuration file.
       Only neccessary for communication via network.
       Not neccessary for access via IPMI system interface (\"-H localhost\").
       It should contain IPMI username, IPMI password, and IPMI privilege-level,
       for example:
         username monitoring
         password yourpassword
         privilege-level user
       As alternative you can use -U/-P/-L instead (see below).
  [-U <username> -P <password> -L <privilege level>]
       IPMI username, IPMI password and IPMI privilege level, provided as
       parameters and not by a FreeIPMI configuration file. Useful for RHEL/
       Centos 5.* with FreeIPMI 0.5.1 (this elder FreeIPMI version does not
       support config files).
       Warning: with this method the password is visible in the process list.
                So whenever possible use a FreeIPMI confiugration file instead.
  [-O <FreeIPMI options>]
       additional options for FreeIPMI. Useful for RHEL/CentOS 5.* with
       FreeIPMI 0.5.1 (this elder FreeIPMI version does not support config
       files).
  [--seloptions <FreeIPMI SEL options>]
       additional options for FreeIPMI SEL command. Useful for passing extra
       options to the ipmi-sel call, e.g. --assume-system-event-records:
       --seloptions '--assume-system-event-records'
  [-b]
       backward compatibility mode for FreeIPMI 0.5.* (this omits the FreeIPMI
       caching options --quiet-cache and --sdr-cache-recreate)
  [-T <sensor type(s)>]
       limit sensors to query based on IPMI sensor type.
       Examples for IPMI sensor types are 'Fan', 'Temperature', 'Voltage', ...
       See the output of the FreeIPMI command 'ipmi-sensors -L' and chapter
       '42.2 Sensor Type Codes and Data' of the IPMI 2.0 spec for a full list
       of possible sensor types. You can also find the full list of possible
       sensor types at https://www.thomas-krenn.com/en/wiki/IPMI_Sensor_Types
       The available types depend on your particular server and the available
       sensors there.
       Multiple sensor types can be specified as a comma-separated list.
  [-ST <SEL sensor type(s)>]
       limit SEL entries to specific types, run 'ipmi-sel -L' for a list of
       types. All sensors are populated to the SEL and per default all sensor
       types are monitored. E.g. to limit the sensor SEL types to Memory and
       Processsor use -ST 'Memory,Processor'.
  [-x <sensor id>]
       exclude sensor matching <sensor id>. Useful for cases when unused
       sensors cannot be deleted from SDR and are reported in a non-OK state.
       Option can be specified multiple times. The <sensor id> is a numeric
       value (sensor names are not used as some servers have multiple sensors
       with the same name). Use -vvv option to query the <sensor ids>.
  [-xT <sensor type(s)>]
       exclude sensors based on IPMI sensor type.
       Multiple sensor types can be specified as a comma-separated list.
  [-xST <SEL sensor type(s)]
       exclude SEL entries of specific sensor types.
       Multiple sensor types can be specified as a comma-separated list.
  [-i <sensor id>]
       include only sensor matching <sensor id>. Useful for cases when only
       specific sensors should be monitored. Be aware that only for the
       specified sensor errors/warnings are generated. Use -vvv option to query
       the <sensor ids>.
  [-v|-vv|-vvv]
       be verbose
         (no -v) .. single line output
         -v   ..... single line output with additional details for warnings
         -vv  ..... multi line output, also with additional details for warnings
         -vvv ..... debugging output, followed by normal multi line output
  [-o]
       change output format. Useful for using the plugin with other monitoring
       software than Nagios or Icinga.
         -o zenoss .. create ZENOSS compatible formatted output (output with
                      underscores instead of whitespaces and no single quotes)
  [-D]
       change the protocol LAN version. Normally LAN_2_0 is used as protocol
       version if not overwritten with this option. Use 'default' here if you
       don't want to use LAN_2_0.
  [-fc <num fans>]
       number of installed fans. If the number of current installed
       fans reported by IPMI is not equal than <num fans> then a Warning state
       is returned. Please use this option carefully as number of fans and
       number of fan sensors can differ!
  [--fru]
       print the product serial number if it is available in the IPMI FRU data.
       For this purpose the tool 'ipmi-fru' is used. E.g.:
         IPMI Status: OK (9000096781)
  [--assettag]
       --fru is mandatory
       print the assettag if it is available in the IPMI FRU data.
         IPMI Status: OK (9000096781)
         Asset Tag: 20200220
  [--board]
       --fru is mandatory
       print additional motherboard informations if it is available in the IPMI FRU data.
         IPMI Status: OK (9000096781)
         Board Manufacturer: Supermicro
         Board Product Name: X10DRW-iT
         Board Serial Number: AB123456
  [--nosel]
       turn off system event log checking via ipmi-sel. If there are
       unintentional entries in SEL, use 'ipmi-sel --clear' or the -sx or -xST
       option.
  [--selonly]
       check only system event log checking via ipmi-sel. If there are
       unintentional entries in SEL, use 'ipmi-sel --clear' or the -sx or -xST
       option.
  [--seltail <count>]
       limit SEL output to specified count of last messages
  [-sx|--selexclude <sel exclude file>]
       use a sel exclude file to exclude entries from the system event log.
       Specify name and type pipe delimitered in this file to exclude an entry,
       for example: System Chassis Chassis Intru|Physical Security
       To get valid names and types use the -vvv option and take a look at:
       debug output for sel (-vvv is set). Don't use name and type from the
       web interface as sensor descriptions are not complete there.
       As with the '-xx' option if the first character of a line is '~' the
       name is treated as a regular expression.
  [-xx|--sexclude <exclude file>]
       use an exclude file to exclude sensors, each line specifies an exclude.
       Specify name and type pipe delimitered in this file to exclude a sensor,
       for example: System Chassis Chassis Intru|Physical Security
       If the first character of a line is '~' the name is treated as a regular
       expression. E.g. to exclude all sensor names from CPU0 to CPU9:
       ~CPU[0-9] Temp|Temperature
       To get valid names and types use the -vvv option.
  [-us|--unify-sensors <unify file>]
       use an unify file to unify sensor names. This is an easy way to rename
       sensors with given patterns in the file. Once might use this option
       to get the same sensor names accross different platforms, e.g. to only
       have 'Mainboard Temperature' as sensor name and not 'MB1 Temperature' or 'System Temp'.
       Rules in the file follow simple regex patterns e.g.:
       ^(MB1 Temperature|System Temp)\$/Mainboard Temperature
       Temp\$/TEMP
  [--nosudo]
       turn off sudo usage on localhost or if ipmi host is ommited.
  [--nothresholds]
       turn off performance data thresholds from output-sensor-thresholds.
  [--noentityabsent]
       skip sensor checks for sensors that have 'noentityabsent' as event state
  [-s <ipmi-sensor output file>]
       simulation mode - test the plugin with an ipmi-sensor output redirected
       to a file.
  [-h]
       show this help
  [-V]
       show version information

Examples:
  \$ check_ipmi_sensor -H 192.0.2.1 -U monitor -P monitor -L user
    IPMI Status: OK | 'System Temp'=30.00 'Peripheral Temp'=32.00
    'FAN 1'=2775.00 [...]
  \$ check_ipmi_sensor -H 192.0.2.1 -U monitor -P monitor -L user -x 205
    IPMI Status: OK | 'System Temp'=30.00 'Peripheral Temp'=32.00
    'FAN 2'=2775.00 [...]
  \$ check_ipmi_sensor -H 192.0.2.1 -U monitor -P monitor -L user -i 4,71
    IPMI Status: OK | 'System Temp'=30.00 'Peripheral Temp'=32.00
  \$ check_ipmi_sensor -H 192.0.2.1 -U monitor -P monitor -L user -i 4 --fru
    IPMI Status: OK (0000012345) | 'System Temp'=30.00

Further information about this plugin can be found at
http://www.thomas-krenn.com/en/wiki/IPMI_Sensor_Monitoring_Plugin

Use the github repo at https://github.com/thomas-krenn/check_ipmi_sensor_v3.git
to submit patches, suggest improvements or if you have questions regarding
use of this plugin.

Attention: the mailing list is no longer in use but an archive can be found at
http://lists.thomas-krenn.com/
EOT
}

sub usage{
	my ($arg) = @_; #the list of inputs
	my ($exitcode);
	if ( defined $arg ){
		if ( $arg =~ m/^\d+$/ ){
			$exitcode = $arg;
		}
		else{
			print STDOUT $arg, "\n";
			$exitcode = 1;
		}
	}
	print STDOUT get_usage();
	exit($exitcode) if defined $exitcode;
}
################################################################################
# set ipmimonitoring path
our $MISSING_COMMAND_TEXT = '';
our $IPMICOMMAND ="";
if(-x "/usr/sbin/ipmimonitoring"){
	$IPMICOMMAND = "/usr/sbin/ipmimonitoring";
}
elsif (-x "/usr/bin/ipmimonitoring"){
	$IPMICOMMAND = "/usr/bin/ipmimonitoring";
}
elsif (-x "/usr/local/sbin/ipmimonitoring"){
	$IPMICOMMAND = "/usr/local/sbin/ipmimonitoring";
}
elsif (-x "/usr/local/bin/ipmimonitoring"){
	$IPMICOMMAND = "/usr/local/bin/ipmimonitoring";
}
else{
	$MISSING_COMMAND_TEXT = " ipmimonitoring/ipmi-sensors command not found!\n";
}

# Identify the version of the ipmi-tool
sub get_ipmi_version{
	my @ipmi_version_output = '';
	my $ipmi_version = '';
	@ipmi_version_output = `$IPMICOMMAND -V`;
	$ipmi_version = shift(@ipmi_version_output);
	$ipmi_version =~ /(\d+)\.(\d+)\.(\d+)/;
	@ipmi_version_output = ();
	push @ipmi_version_output,$1,$2,$3;
	return @ipmi_version_output;
}

sub simulate{
	my $output = '';
	my $simul_file = $_[0];
	if( !defined $simul_file || (-x '\"'.$simul_file.'\"')){
		print "DEBUG: Using simulation file: $simul_file\n";
		print "Error: Simulation file with ipmi output not found.\n";
		exit(3);
	}
	return ($output = `cat $simul_file`);
}

sub get_fru{
	my @frucmd = @{(shift)};
	my $verbosity = shift;
	my $fru;
	if(-e '/usr/sbin/ipmi-fru'){
		$fru = '/usr/sbin/ipmi-fru';
	}
	else{
		chomp($fru = `which ipmi-fru`);
	}
	#if sudo is used the command is the second element
	if($frucmd[0] eq 'sudo'){
		$frucmd[1] = $fru;
	}
	else{
		$frucmd[0] = $fru;
	}
	#skip checksum validation
	push @frucmd,'-s';
	my $fruoutput;
	my $returncode;
	run \@frucmd, '>&', \$fruoutput;
	#the upper eight bits contain the error condition (exit code)
	#see http://perldoc.perl.org/perlvar.html#Error-Variables
	$returncode = $? >> 8;
	if ( $returncode != 0 ){
		print "$fruoutput\n";
		print "-> Execution of $fru failed with return code $returncode.\n";
		print "-> $fru was executed with the following parameters:\n";
		print "   ", join(' ', @frucmd), "\n";
		exit(3);
	}
	if($verbosity == 3){
		print "------------- debug output for fru (-vvv is set): ------------\n";
		print "  $fru was executed with the following parameters:\n";
		print "    ", join(' ', @frucmd), "\n";
		print "  output of FreeIPMI:\n";
		print "$fruoutput";
	}
	return split('\n', $fruoutput);
}

sub get_sel{
	my @selcmd = @{(shift)};
	my $verbosity = shift;
	my @sel_sensor_types = @{(shift)};
	my @exclude_sel_sensor_types = @{(shift)};
	my @sel_options = @{(shift)};
	my $sel;
	if(-e '/usr/sbin/ipmi-sel'){
		$sel = '/usr/sbin/ipmi-sel';
	}
	else{
		chomp($sel = `which ipmi-sel`);
	}
	#if sudo is used the command is the second element
	if($selcmd[0] eq 'sudo'){
		$selcmd[1] = $sel;
	}
	else{
		$selcmd[0] = $sel;
	}
	push @selcmd, '--output-event-state', '--interpret-oem-data', '--entity-sensor-names';
	push @selcmd, '--sensor-types=' . join(',', @sel_sensor_types);
	if(@exclude_sel_sensor_types){
		push @selcmd, '--exclude-sensor-types=' . join(',', @exclude_sel_sensor_types);
	}
	if(@sel_options){
		push @selcmd, @sel_options;
	}
	my $seloutput;
	my $returncode;
	run \@selcmd, '>&', \$seloutput;
	$returncode = $? >> 8;
	if ( $returncode != 0 ){
		print "$seloutput\n";
		print "-> Execution of $sel failed with return code $returncode.\n";
		print "-> $sel was executed with the following parameters:\n";
		print "   ", join(' ', @selcmd), "\n";
		exit(3);
	}
	if($verbosity == 3){
		print "------------- debug output for sel (-vvv is set): ------------\n";
		print "  $sel was executed with the following parameters:\n";
		print "    ", join(' ', @selcmd), "\n";
		print "  output of FreeIPMI:\n";
		print "$seloutput";
	}
	return split('\n', $seloutput);
}

sub parse_sel{
	my $selcmd = shift;
	my $verbosity = shift;
	my $sel_xfile = shift;
	my $sel_sensor_types = shift;
	my $exclude_sel_sensor_types = shift;
	my $sel_options = shift;
	my @seloutput = get_sel($selcmd, $verbosity, $sel_sensor_types, $exclude_sel_sensor_types, $sel_options);
	# Remove unknown SEL records as they break output, in verbose mode these unknown records are kept as debug output
	@seloutput = grep(!/Unknown SEL Record Type:/, @seloutput);
	@seloutput = map { [ map { s/^\s*//; s/\s*$//; $_; } split(m/\|/, $_) ] } @seloutput;
	my $header = shift(@seloutput);

	my @sel_rows;
	foreach my $row (@seloutput){
		my %curr_row;
		for(my $i = 0; $i < scalar(@{$header}); $i++){
			my $key = lc $header->[$i];
			$curr_row{$key} = $row->[$i];
		}
		if(!(exclude_with_file($sel_xfile, $curr_row{'name'}, $curr_row{'type'}))){
			push @sel_rows, \%curr_row;
		}
	}
	return \@sel_rows;
}

sub get_dcmi{
	my @dcmicmd = @{(shift)};
	my $verbosity = shift;
	my $dcmi;
	if(-e '/usr/sbin/ipmi-dcmi'){
		$dcmi = '/usr/sbin/ipmi-dcmi';
	}
	else{
		chomp($dcmi = `which ipmi-dcmi`);
	}
	#if sudo is used the command is the second element
	if($dcmicmd[0] eq 'sudo'){
		$dcmicmd[1] = $dcmi;
	}
	else{
		$dcmicmd[0] = $dcmi;
	}
	push @dcmicmd, '--get-system-power-statistics';

	my $dcmioutput;
	my $returncode;
	run \@dcmicmd, '>&', \$dcmioutput;
	$returncode = $? >> 8;
	if ( $returncode == 0 ){
		return split('\n', $dcmioutput);
	}
}

sub parse_dcmi{
	my $dcmicmd = shift;
	my $verbosity = shift;
	my @dcmioutput = get_dcmi($dcmicmd, $verbosity);
	if(@dcmioutput){
		@dcmioutput = map { [ map { s/^\s*//; s/\s*$//; $_; } split(m/\:/, $_) ] } @dcmioutput;
		my %current_power;
		my $power_available = 0;
		foreach my $power (@dcmioutput){
			if(defined($power) && defined($power->[0]) && $power->[0] ne ''){
				if($power->[0] eq 'Current Power'){
					$power->[1] =~ m/^(\d+)/;
					my $watts = $1;
					$current_power{'Current Power'} = $watts;
				}
				if($power->[0] eq 'Power Measurement'){
					if($power->[1] eq 'Active'){
						$power_available = 1;
					}
				}
			}
		}
		if($power_available == 1){
			return \%current_power;
		}
	}
}

# Excludes a name and type pair if it is present in the given file, pipe
# delimitered.
# @return 1 if name should be skipped, 0 if not
sub exclude_with_file{
	my $file_name = shift;
	my $name = shift;
	my $type = shift;
	my @xlist;
	my $skip = 0;
	if($file_name){
		if(!(open (FH, "< $file_name"))){
			print "-> Reading exclude file $file_name failed with: $!.\n";
			exit(3);
		};
		@xlist = <FH>;
	}
	foreach my $exclude (@xlist){
		my @curr_exclude = map { s/^\s*//; s/\s*$//; $_; } split(/\|/,$exclude);
		if(@curr_exclude && $curr_exclude[0] ne '' && $curr_exclude[1] ne ''){
			#if the first char of the name in the exclude file is a '~' treat it as regex
			if(substr($curr_exclude[0], 0, 1 ) eq '~'){
				my $regex_curr_exclude = substr $curr_exclude[0], 1;
				if($name =~ m/$regex_curr_exclude/ && $curr_exclude[1] eq $type){
					$skip = 1;
				}
			}
			elsif($curr_exclude[0] eq $name && $curr_exclude[1] eq $type){
				$skip = 1;
			}
		}
	}
	close FH;
	return $skip;
}

# Reads regular expressions from a file and applies the rules to sensor names.
# This unifies sensor names across different platforms.
# @return The sensor name with specified unify rules applied
sub unify_with_file{
	my $file_name = shift;
	my $name = shift;# given sensor name
	my @ulist;# list of rules to apply
	if($file_name){
		if(!(open (FH, "< $file_name"))){
			print "-> Reading unify file $file_name failed with: $!.\n";
			exit(3);
		};
		@ulist = <FH>;
	}
	foreach my $unify_rule (@ulist){
		#split at the only / that is not masked with a \,
		#this is the separator in s/x/y/g to get x and y
		my @curr_rule = map { s/^\s*//; s/\s*$//; $_; } split(/(?<!\\)\//,$unify_rule);
		if(@curr_rule && $curr_rule[0] ne '' && $curr_rule[1] ne ''){
			$name =~ s/$curr_rule[0]/$curr_rule[1]/g;
		}
	}
	close FH;
	return $name;
}

#define entire hashes
our %hdrmap = (
	'Record_ID'		=> 'id',	# FreeIPMI ...,0.7.x
	'Record ID'		=> 'id',	# FreeIPMI 0.8.x,... with --legacy-output
	'ID'			=> 'id',	# FreeIPMI 0.8.x
	'Sensor Name'		=> 'name',
	'Name'			=> 'name',	# FreeIPMI 0.8.x
	'Sensor Group'		=> 'type',
	'Type'			=> 'type',	# FreeIPMI 0.8.x
	'Monitoring Status'	=> 'state',
	'State'			=> 'state',	# FreeIPMI 0.8.x
	'Sensor Units'		=> 'units',
	'Units'			=> 'units',	# FreeIPMI 0.8.x
	'Sensor Reading'	=> 'reading',
	'Reading'		=> 'reading',	# FreeIPMI 0.8.x
	'Event'			=> 'event',	# FreeIPMI 0.8.x
	'Lower C'		=> 'lowerC',
	'Lower NC'		=> 'lowerNC',
	'Upper C'		=> 'upperC',
	'Upper NC'		=> 'upperNC',
	'Lower NR'		=> 'lowerNR',
	'Upper NR'		=> 'upperNR',
);

our $verbosity = 0;

MAIN: {
	$| = 1; #force a flush after every write or print
	my @ARGV_SAVE = @ARGV;#keep args for verbose output
	my ($show_help, $show_version);
	my ($ipmi_host, $ipmi_user, $ipmi_password, $ipmi_privilege_level, $ipmi_config_file, $ipmi_outformat);
	my (@freeipmi_options, $freeipmi_compat, @sel_options);
	my (@ipmi_sensor_types, @ipmi_exclude_sensor_types, @ipmi_xlist, @ipmi_ilist);
	my (@ipmi_version);
	my $ipmi_sensors = 0;#states to use ipmi-sensors instead of ipmimonitoring
	my $fan_count;#number of fans that should be installed in unit
	my $lanVersion;#if desired use a different protocol version
	my $abort_text = '';
	my $zenoss = 0;
	my @sel_sensor_types;
	my @exclude_sel_sensor_types;
	my $sel_issues_present = 0;
	my $simulate = '';
	my ($use_fru, $use_asset, $use_board, $no_sel, $sel_only, $sel_tail, $no_sudo, $use_thresholds, $no_thresholds, $sel_xfile, $s_xfile, $s_ufile, $no_entity_absent);

	#read in command line arguments and init hash variables with the given values from argv
	if ( !( GetOptions(
		'H|host=s'			=> \$ipmi_host,
		'f|config-file=s'	=> \$ipmi_config_file,
		'U|user=s'			=> \$ipmi_user,
		'P|password=s'  	=> \$ipmi_password,
		'L|privilege-level=s'	=> \$ipmi_privilege_level,
		'O|options=s'		=> \@freeipmi_options,
		'seloptions=s'		=> \@sel_options,
		'b|compat'			=> \$freeipmi_compat,
		'T|sensor-types=s'	=> \@ipmi_sensor_types,
		'xT|exclude-sensor-types=s'	=> \@ipmi_exclude_sensor_types,
		'ST|sel-sensor-types=s'	=> \@sel_sensor_types,
		'xST|exclude-sel-sensor-types=s'	=> \@exclude_sel_sensor_types,
		'fru'				=> \$use_fru,
		'assettag'			=> \$use_asset,
		'board'				=> \$use_board,
		'nosel'				=> \$no_sel,
		'selonly'			=> \$sel_only,
		'seltail=s'			=> \$sel_tail,
		'nosudo'			=> \$no_sudo,
		'nothresholds'			=> \$no_thresholds,
		'noentityabsent'	=> \$no_entity_absent,
		'v|verbosity'		=> \$verbosity,
		'vv'				=> sub{$verbosity=2},
		'vvv'				=> sub{$verbosity=3},
		'x|exclude=s'		=> \@ipmi_xlist,
		'sx|selexclude=s'	=> \$sel_xfile,
		'xx|sexclude=s'		=> \$s_xfile,
		'us|unify-sensors=s'=> \$s_ufile,
		'i|include=s'		=> \@ipmi_ilist,
		'o|outformat=s'		=> \$ipmi_outformat,
		'fc|fancount=i'		=> \$fan_count,
		'D=s'				=> \$lanVersion,
		's=s'				=> \$simulate,
		'h|help'			=>
			sub{print STDOUT get_version();
				print STDOUT "\n";
				print STDOUT get_usage();
				print STDOUT "\n";
				print STDOUT get_help();
				exit(0)
			},
		'V|version'			=>
			sub{
				print STDOUT get_version();
				exit(0);
			},
		'usage|?'			=>
			sub{print STDOUT get_usage();
				exit(3);
			}
	) ) ){
		usage(1);#call usage if GetOptions failed
	}
	usage(1) if @ARGV;#print usage if unknown arg list is left

################################################################################
# check for ipmimonitoring or ipmi-sensors. Since version > 0.8 ipmi-sensors is used
# if '--legacy-output' is given ipmi-sensors cannot be used
	if( $MISSING_COMMAND_TEXT ne "" ){
		print STDOUT "Error:$MISSING_COMMAND_TEXT";
		exit(3);
	}
	else{
		@ipmi_version = get_ipmi_version();
		if( $ipmi_version[0] > 0 && (grep(/legacy\-output/,@freeipmi_options)) == 0){
			$IPMICOMMAND =~ s/ipmimonitoring/ipmi-sensors/;
			$ipmi_sensors = 1;
		}
		if( $ipmi_version[0] > 0 && (grep(/legacy\-output/,@freeipmi_options)) == 1){
			print "Error: Cannot use ipmi-sensors with option \'--legacy-output\'. Remove it to work correctly.\n";
			exit(3);
		}
		# check if output-sensor-thresholds can be used, this is supported
		# since 1.2.1. Version 1.2.0 was not released, so skip the third minor
		# version number
		if($ipmi_version[0] > 1 || ($ipmi_version[0] == 1 && $ipmi_version[1] >= 2)){
			$use_thresholds = 1;
		}
		else{
			$use_thresholds = 0;
		}
	}
###############################################################################
# verify if all mandatory parameters are set and initialize various variables
	#\s defines any whitespace characters
	#first join the list, then split it at whitespace ' '
	#also cf. http://perldoc.perl.org/Getopt/Long.html#Options-with-multiple-values
	@freeipmi_options = split(/\s+/, join(' ', @freeipmi_options)); # a bit hack, shell word splitting should be implemented...
	@ipmi_sensor_types = split(/,/, join(',', @ipmi_sensor_types));
	@ipmi_exclude_sensor_types = split(/,/, join(',', @ipmi_exclude_sensor_types));
	@sel_sensor_types = split(/,/, join(',', @sel_sensor_types));
	@sel_options = split(/,/, join(',', @sel_options));
	@exclude_sel_sensor_types = split(/,/, join(',', @exclude_sel_sensor_types));
	@ipmi_xlist = split(/,/, join(',', @ipmi_xlist));
	@ipmi_ilist = split(/,/, join(',', @ipmi_ilist));

	#check for zenoss output
	if(defined $ipmi_outformat && $ipmi_outformat eq "zenoss"){
		$zenoss = 1;
	}

	# Per default monitor all sensor types, use -ST to specify your sensor types
	if(!@sel_sensor_types){
		@sel_sensor_types = ('all');
	}
    # If -xST has not been set, set this array to empty.
	if(!@exclude_sel_sensor_types){
		@exclude_sel_sensor_types = ();
	}
	if(!@sel_options){
		@sel_options = ();
	}

	# Define basic ipmi command
	my @basecmd = $IPMICOMMAND;
	# If host is omitted localhost is assumed, if not turned off sudo is used
	if(!(defined $ipmi_host) || ($ipmi_host eq 'localhost')){
		if(!defined($no_sudo)){
			# Only add sudo if not already root
			@basecmd = ($> != 0 ? 'sudo' : (), $IPMICOMMAND);
		}
	}
	# If we are not local, we need authentication credentials
	else{
		# Add the ipmi desired host
		push @basecmd, '-h', $ipmi_host;
		if(defined $ipmi_config_file){
			push @basecmd, '--config-file', $ipmi_config_file;
		}
		elsif(defined $ipmi_user && defined $ipmi_password && defined $ipmi_privilege_level ){
			push @basecmd, '-u', $ipmi_user, '-p', $ipmi_password, '-l', $ipmi_privilege_level;
		}
		else{
			$abort_text = $abort_text . " -f <FreeIPMI config file> or -U <username> -P <password> -L <privilege level>";
		}
		if( $abort_text ne ""){
			print STDOUT "Error: " . $abort_text . " missing.";
			print STDOUT get_usage();
			exit(3);
		}
	}
	# copy command for fru usage
	my @frucmd;
	if($use_fru){
		@frucmd = @basecmd
	}
	my @selcmd = @basecmd;
	my @dcmicmd = @basecmd;

	if(@ipmi_sensor_types){
		# , is the seperator in the new string
    	# -g option is older name for ipmi-sensors -t or --sensor-types and
    	# compatible with both older and newer version of FreeIPMI
		push @basecmd, '-g', join(',', @ipmi_sensor_types);
	}

	# add sensor types to exclude
	if(@ipmi_exclude_sensor_types){
		push @basecmd, '--exclude-sensor-types', join(',', @ipmi_exclude_sensor_types);
	}


	if(@freeipmi_options){
		push @basecmd, @freeipmi_options;
	}

	#keep original basecmd for later usage
	my @getstatus = @basecmd;

	#if -b is not defined, caching options are used
	if( !(defined $freeipmi_compat) ){
		push @getstatus, '--quiet-cache', '--sdr-cache-recreate';
	}
	#since version 0.8 it is possible to interpret OEM data
	if( ($ipmi_version[0] == 0 && $ipmi_version[1] > 7) ||
			$ipmi_version[0] > 0){
				push @getstatus, '--interpret-oem-data';
	}
	#since version 0.8 it is necessary to add the legacy option
	if( ($ipmi_version[0] == 0 && $ipmi_version[1] > 7) && (grep(/legacy\-output/,@freeipmi_options) == 0)){
		push @getstatus, '--legacy-output';
	}
	#if ipmi-sensors is used show the state of sensors and ignore N/A
	if($ipmi_sensors){
		push @getstatus, '--output-sensor-state', '--ignore-not-available-sensors';
	}
	#if not stated otherwise we use protocol lan version 2 per default
	if(!defined($lanVersion)){
		$lanVersion = 'LAN_2_0';
	}
	if($lanVersion ne 'default' && defined $ipmi_host && $ipmi_host ne 'localhost'){
		push @getstatus, "--driver-type=$lanVersion";
		if(!$no_sel){
			push @selcmd, "--driver-type=$lanVersion";
		}
		if($use_fru){
			push @frucmd, "--driver-type=$lanVersion";
		}
	}
	if($use_thresholds && !$no_thresholds){
		push @getstatus, '--output-sensor-thresholds';
	}
	if(defined($sel_tail)){
		push @selcmd, "--tail=$sel_tail";
	}

################################################################################
	#execute status command and redirect stdout and stderr to ipmioutput
	my $ipmioutput;
	my $returncode;
	if ($sel_only){
		$returncode = 0;
	}
	elsif(!$simulate){
		run \@getstatus, '>&', \$ipmioutput;
		#the upper eight bits contain the error condition (exit code)
		#see http://perldoc.perl.org/perlvar.html#Error-Variables
		$returncode = $? >> 8;
	}
	else{
		$ipmioutput = simulate($simulate);
		print "DEBUG: Using simulation mode\n";
		$returncode = 0;
	}
	my @fruoutput;
	if($use_fru){
		@fruoutput = get_fru(\@frucmd, $verbosity);
	}
	my $seloutput;
	if(!$no_sel){
		$seloutput = parse_sel(\@selcmd, $verbosity, $sel_xfile, \@sel_sensor_types, \@exclude_sel_sensor_types, \@sel_options);
	}
	my $dcmioutput;
	$dcmioutput = parse_dcmi(\@dcmicmd, $verbosity);
################################################################################
# print debug output when verbosity is set to 3 (-vvv)
	if ( $verbosity == 3 && !$sel_only ){
		my $ipmicommandversion;
		run [$IPMICOMMAND, '-V'], '2>&1', '|', ['head', '-n', 1], '&>', \$ipmicommandversion;
		#remove trailing newline with chomp
		chomp $ipmicommandversion;
		print "------------- debug output for sensors (-vvv is set): ------------\n";
		print "  script was executed with the following parameters:\n";
		print "    $0 ", join(' ', @ARGV_SAVE), "\n";
		print "  check_ipmi_sensor version:\n";
		print "    $check_ipmi_sensor_version\n";
		print "  FreeIPMI version:\n";
		print "    $ipmicommandversion\n";
		print "  FreeIPMI was executed with the following parameters:\n";
		print "    ", join(' ', @getstatus), "\n";
		print "  FreeIPMI return code: $returncode\n";
		print "  output of FreeIPMI:\n";
		print "$ipmioutput\n";
		print "--------------------- end of debug output ---------------------\n";
	}

################################################################################
# generate main output
	if ( $returncode != 0 ){
		print "$ipmioutput\n";
		print "-> Execution of $IPMICOMMAND failed with return code $returncode.\n";
		print "-> $IPMICOMMAND was executed with the following parameters:\n";
		print "   ", join(' ', @getstatus), "\n";
		exit(3);
	}
	else{
		my @outputRows;
		if(defined($ipmioutput)){
			@outputRows = split('\n', $ipmioutput);
		}
		if(!$sel_only && (!defined($ipmioutput) || scalar(@outputRows) == 1)){
			print "-> Your server seems to be powered off.";
			print " (Execution of FreeIPMI returned an empty output or only 1 header row!)\n";
			print "-> $IPMICOMMAND was executed with the following parameters:\n";
			print "   ", join(' ', @getstatus), "\n";
			exit(3);
		}
		#print desired filter types
		if ( @ipmi_sensor_types ){
			print "Sensor Type(s) ", join(', ', @ipmi_sensor_types), " Status: ";
		}
		elsif ($sel_only){
			print "SEL Status: ";
		}
		else{
			print "IPMI Status: ";
		}
		#start with main output
		my $exit = 0;
		my $w_sensors = '';#sensors with warnings
		my $sel_w_sensors = '';#verbose output for sel entries with warnings
		my $perf = '';#performance sensor
		my $curr_fans = 0;
		my @ipmioutput2;#filtered original ipmi output

		#skip ipmi output, if only SEL queried
		if (!$sel_only){
			#split at newlines, fetch array with lines of output
			my @ipmioutput = split('\n', $ipmioutput);

			#remove sudo errors and warnings like they appear on dns resolving issues
			@ipmioutput = map { /^sudo:/ ? () : $_ } @ipmioutput;

			#remove leading and trailing whitespace characters, split at the pipe delimiter
			@ipmioutput = map { [ map { s/^\s*//; s/\s*$//; $_; } split(m/\|/, $_) ] } @ipmioutput;

			#shift out the header as it is the first line
			my $header = shift @ipmioutput;
			if(!defined($header)){
				print "$ipmioutput\n";
				print " FreeIPMI returned an empty header map (first line)";
				if(@ipmi_sensor_types){
					print " FreeIPMI could not find any sensors for the given sensor type (option '-T').\n";
				}
				exit(3);
			}
			my %header;
			for(my $i = 0; $i < @$header; $i++)
			{
				#assigning %header with (key from hdrmap) => $i
				#checking at which position in the header is which key
				$header{$hdrmap{$header->[$i]}} = $i;
			}
			foreach my $row ( @ipmioutput ){
				my %row;
				#fetch keys from header and assign existent values to row
				#this maps the values from row(ipmioutput) to the header values
				while ( my ($key, $index) = each %header ){
					#check if the option to unify sensor names is active
					if($key eq 'name' && $s_ufile && $s_ufile ne ''){
						$row{$key} = unify_with_file($s_ufile, $row->[$index]);
					}
					else{
						$row{$key} = $row->[$index];
					}
				}
				if(!(exclude_with_file($s_xfile, $row{'name'}, $row{'type'}))){
					push @ipmioutput2, \%row;
				}
			}
			#create hash with sensor name an 1
			my %ipmi_xlist = map { ($_, 1) } @ipmi_xlist;
			#filter out the desired sensor values
			@ipmioutput2 = grep(!exists $ipmi_xlist{$_->{'id'}}, @ipmioutput2);
			#check for an include list
			if(@ipmi_ilist){
				my %ipmi_ilist = map { ($_, 1) } @ipmi_ilist;
				#only include sensors from include list
				@ipmioutput2 = grep(exists $ipmi_ilist{$_->{'id'}}, @ipmioutput2);
			}
			foreach my $row ( @ipmioutput2 ){
				if( $zenoss ){
					$row->{'name'} =~ s/ /_/g;
				}
				my $check_sensor_state = 1;
				if($no_entity_absent){
					if(exists $row->{'event'} && ($row->{'event'} =~ /\'.*((Device|Entity) (Absent|Removed)).*\'/)){
						$check_sensor_state = 0;
					}
					if(exists $row->{'reading'} && ($row->{'reading'} =~ /\'.*((Device|Entity) (Absent|Removed)).*\'/)){
						$check_sensor_state = 0;
					}
				}
				#check for warning sensors
				if($check_sensor_state && ($row->{'state'} ne 'Nominal' && $row->{'state'} ne 'N/A')){
					$exit = 1 if $exit < 1;
					$exit = 2 if $exit < 2 && $row->{'state'} ne 'Warning';
					#don't insert a , the first time
					$w_sensors .= ", " unless $w_sensors eq '';
					$w_sensors .= "$row->{'name'} = $row->{'state'}";
					if( $verbosity ){
						if( $row->{'reading'} ne 'N/A'){
							$w_sensors .= " ($row->{'reading'})" ;
						}
						else{
							$w_sensors .= " ($row->{'event'})";
						}
					}
				}
				if($check_sensor_state && ($row->{'units'} ne 'N/A')){
					my $val = $row->{'reading'};
					my $perf_data;
					my $perf_thresholds;
					if($zenoss){
						$perf_data = $row->{'name'}."=".$val;
					}
					else{
						$perf_data = "'".$row->{'name'}."'=".$val;
					}
					if($use_thresholds && !$no_thresholds){
						if(($row->{'lowerNC'} ne 'N/A') && ($row->{'upperNC'} ne 'N/A')){
							$perf_thresholds = $row->{'lowerNC'}.":".$row->{'upperNC'}.";";
						}
						elsif(($row->{'lowerNC'} ne 'N/A') && ($row->{'upperNC'} eq 'N/A')){
							$perf_thresholds = $row->{'lowerNC'}.":;";
						}
						elsif(($row->{'lowerNC'} eq 'N/A') && ($row->{'upperNC'} ne 'N/A')){
							$perf_thresholds = "~:".$row->{'upperNC'}.";";
						}
						elsif(($row->{'lowerNC'} eq 'N/A') && ($row->{'upperNC'} eq 'N/A')){
							$perf_thresholds = ";";
						}
						if(($row->{'lowerC'} ne 'N/A') && ($row->{'upperC'} ne 'N/A')){
							$perf_thresholds .= $row->{'lowerC'}.":".$row->{'upperC'};
						}
						elsif(($row->{'lowerC'} ne 'N/A') && ($row->{'upperC'} eq 'N/A')){
							$perf_thresholds .= $row->{'lowerC'}.":";
						}
						elsif(($row->{'lowerC'} eq 'N/A') && ($row->{'upperC'} ne 'N/A')){
							$perf_thresholds .= "~:".$row->{'upperC'};
						}
						# Add thresholds to performance data
						if(($row->{'lowerNC'} ne 'N/A') || ($row->{'upperNC'} ne 'N/A') ||
						($row->{'lowerC'} ne 'N/A') || ($row->{'upperC'} ne 'N/A')){
							$perf_data .= ";".$perf_thresholds;
						}
					}
					$perf .= $perf_data." ";
				}
				if( $row->{'type'} eq 'Fan' && $row->{'reading'} ne 'N/A' ){
					$curr_fans++;
				}
			}
		}
		foreach my $row (@{$seloutput}){
			if( $zenoss ){
				$row->{'name'} =~ s/ /_/g;
			}
			if ($row->{'state'} ne 'Nominal'){
				$sel_issues_present += 1;
				$exit = 1 if $exit < 1;
				$exit = 2 if $exit < 2 && $row->{'state'} ne 'Warning';
				if( $verbosity ){
					$sel_w_sensors .= ", " unless $sel_w_sensors eq '';
					$sel_w_sensors .= "($row->{'name'} = $row->{'state'},";
					$sel_w_sensors .= " $row->{'type'}," ;
					$sel_w_sensors .= " $row->{'event'})" ;
				}
			}
		}
		if ( $sel_issues_present ){
			$w_sensors .= ", " unless $w_sensors eq '';
			if ( $sel_issues_present == 1 ){
				$w_sensors .= "1 system event log (SEL) entry present";
			}else{
				$w_sensors .= $sel_issues_present." system event log (SEL) entries present";
			}
			if( $verbosity ){
				$w_sensors .= " - details: ";
				$w_sensors .= $sel_w_sensors;
				$w_sensors .= " - fix the reported issues and clear your SEL";
				$w_sensors .= " or exclude specific SEL entries using the -sx or -xST option";
			}
		}
		#now check if num fans equals desired unit fans
		if( $fan_count ){
			if( $curr_fans < $fan_count ){
				$exit = 1 if $exit < 1;
				$w_sensors .= ", " unless $w_sensors eq '';
				$w_sensors .= "Fan = Warning";
				if( $verbosity ){
					$w_sensors .= " ($curr_fans)" ;
				}
			}
		}
		#check for the FRU serial number, asset tag and board information
		my @server_serial;
		my $serial_number;
		my @server_asset;
		my $asset_tag;
		my @server_board;
		my $board_manufacturer;
		my $board_product;
		my $board_serial;
		if( $use_fru ){
			@server_serial = grep(/Product Serial Number/,@fruoutput);
			if(@server_serial){
				$server_serial[0] =~ m/\:\s+(.*)$/;
				$serial_number = $1;
			}
			if ( $use_asset ){
				@server_asset = grep(/Product Asset Tag/,@fruoutput);
				if(@server_asset){
					$server_asset[0] =~ m/\:\s+(.*)$/;
					$asset_tag = $1;
				}
			}
			if ( $use_board ){
				@server_board = grep(/Board/,@fruoutput);
				foreach ( @server_board) {
					if ( $_ =~ /Board Manufacturer/ ){
						$_ =~ m/Board Manufacturer\:\s+(.*)/;
						$board_manufacturer = $1;
					}
					if ( $_ =~ /Board Product Name/ ){
						$_ =~ m/Board Product Name\:\s+(.*)/;
						$board_product = $1;
					}
					if ( $_ =~ /Board Serial Number/ ){
						$_ =~ m/Board Serial Number\:\s+(.*)/;
						$board_serial = $1;
					}
				}
			}
		}
		if(defined($dcmioutput) && $dcmioutput ne ''){
			my $power_perf = '';
			if(exists $dcmioutput->{'Current Power'}){
				my $power_key = 'Current Power';
				if($s_ufile && $s_ufile ne ''){
					$power_key = unify_with_file($s_ufile, $power_key);
				}
				if( $zenoss ){
					$power_key =~ s/ /_/g;
				}
				$power_perf = "\'$power_key\'=" . $dcmioutput->{'Current Power'};
			}
			$perf = $power_perf . ' ' . $perf;
		}
		$perf = substr($perf, 0, -1);#cut off the last chars
		if ( $exit == 0 ){
			print "OK";
		}
		elsif ( $exit == 1 ){
			print "Warning [$w_sensors]";
		}
		else{
			print "Critical [$w_sensors]";
		}
		if( $use_fru && defined($serial_number)){
			print " ($serial_number)";
			if ($use_asset && defined($asset_tag)){
				print "\nAsset Tag: $asset_tag";
			}
			if ( $use_board ){
				if (defined($board_manufacturer)){
					print "\nBoard Manufacturer: $board_manufacturer";
				}
				if (defined($board_product)){
					print "\nBoard Product: $board_product";
				}
				if (defined($board_serial)){
					print "\nBoard Serial: $board_serial";
				}
			}
		}
		print " | ", $perf if $perf ne '';
		print "\n";

		if ( $verbosity > 1 ){
			foreach my $row (@ipmioutput2){
				if( $row->{'state'} eq 'N/A'){
					next;
				}
				elsif( $row->{'reading'} ne 'N/A'){
					print "$row->{'name'} = $row->{'reading'} ";
				}
				elsif( $row->{'event'} ne 'N/A'){
					print "$row->{'name'} = $row->{'event'} ";
				}
				else{
					next;
				}
				print "(Status: $row->{'state'})\n";
			}
		}
		exit $exit;
	}
};