#!/usr/bin/perl
# nagios: -epn
#
# Copyright (c) 2007,2011 Eric F Crist
#
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or 
# without modification, are permitted provided that the following 
# conditions are met:
#
# Redistributions of source code must retain the above copyright 
# notice, this list of conditions and the following disclaimer.
# 
# Redistributions in binary form must reproduce the above copyright 
# notice, this list of conditions and the following disclaimer in 
# the documentation and/or other materials provided with the distribution.
# 
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
# CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
# EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
# PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
# PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
# LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
# NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
# SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#
# $Id: check_printer 363 2014-07-23 14:37:59Z ecrist $
# $HeadURL: trunk/nagios/check_printer $

use strict;
use warnings;

sub load_module {
    my @names = @_;
    my $module;
    for my $name (@names) {
        my $file = $name;
        # requires need either a bare word or a file name
        $file =~ s{::}{/}gsxm;
        $file .= '.pm';
        eval {
            require $file;
            $name->import(qw(%ERRORS));
            $module = $name;
		};
		last if $module;
    }
    return $module;
}

my $plugin_module;
BEGIN {
	$plugin_module = load_module( 'Monitoring::Plugin', 'Nagios::Plugin' );
}

use Getopt::Long;
use Pod::Usage;

'$Revision: 363 $' =~ m/Revision: (\d+)/;
my $revision = $1;
'$HeadURL: trunk/nagios/check_printer $' =~ m/HeadURL: ([\w\:\/\-\.\_]+) /;
my $src_url = $1;
my $debug = 0;
my ($host, $warning, $critical, @ignore);
my $community = "public";

our %getopts;
Getopt::Long::Configure("bundling");
GetOptions(
	"h|host=s"	=>	\$host,
	"C|community=s"	=>	\$community,
	"w|warn=i"	=>	\$warning,
	"c|crit=i"	=>	\$critical,
	"i=i"		=>	\@ignore,
	'V|version'	=>	sub { print '$Id: check_printer 363 2014-07-23 14:37:59Z ecrist $' ."\n"; exit 0 },
	"d|debug"	=>	\$debug,
	"man"		=>	sub { pod2usage(-exitstatus => 0, -verbose => 2); exit 0 }
) or pod2usage(2);


pod2usage(2)  unless (defined($host));

my $base_oid = ".1.3.6.1.2.1.43.11.1.1";
my $type_oid = "3.1";
my $name_oid = "6.1";
my $uom_oid = "7.1";
my $max_oid  = "8.1";
my $curr_oid = "9.1";
my $loop;



my $comm = $ARGV[1];

my @vars = ("snmpwalk -On -v 1 -c $community $host $base_oid.$name_oid",
	   "snmpwalk -On -v 1 -c $community $host $base_oid.$uom_oid",
	   "snmpwalk -On -v 1 -c $community $host $base_oid.$max_oid",
	   "snmpwalk -On -v 1 -c $community $host $base_oid.$curr_oid");

my(@values, @names, @max, @min);

our %uom = (     "4" => "µm",
		"7" => "impressions",
		"8" => "pages",
		"11" => "hrs",
		"12" => "oz/1000",
		"13" => "gr/10",
		"14" => "gr/100",
		"15" => "mL",
		"16" => "feet",
		"17" => "meters",
		"18" => "items",
		"19" => "%");

foreach(@vars){
	@values = (@values, split /\n/, `$_`);
	if ($? != 0){
		print "Printer Supplies UNKNOWN";
		exit 3;
	}
}

if ($debug){
        use Data::Dumper;
	print Dumper(\@values);
}
my %finvalues;

my $ignore = join('|', @ignore);

foreach(@values){
	# matching the following line
	#            $1                    $2           $3 
	# .1.3.6.1.2.1.43.11.1.1.6.1.1 = STRING: "Black Cartridge"
	$_ =~ m/^([\.\d]+) = ([\w-]+):[\s\"]+([\(\)\-\d\w\s,\/:]+)\"*$/ or next;
	my $loid = $1;
	my $ltype = $2;
	my $string = $3;
	if ($loid =~ m/\.(${ignore})$/){
		next;
	}
	if ($ltype =~ m/HEX/i){
		# hex string, convert to ascii
		$string = join "", map {chr hex $_ } split m/ /, $string;
	}
	$finvalues{"$loid"} = $string;
}

my %status;
# get OID field numbers for matching later
while (my ($key, $value) = each(%finvalues)){
	## sort this array into an associative in the following format:
	#    $status['name']   : Supply Name
	#    $status['curr']   : Supply Status
	#    $status['max']    : Supply Level When New
	my $search = quotemeta("$base_oid.$name_oid");
	if ($key =~ /^$search\.([\d\.]+)$/){
		## we'll assume a name
		$status{$value}{"sub"} = $1;
	} else {
	}
}
# get maximum values,  matching on OID field number
while (my ($key, $value) = each(%finvalues)){
	my $search = quotemeta("$base_oid.$max_oid");
	if ($key =~ /^$search\.([\d\.]+)$/){
		## assign it to the other variable
		## search the existing keys, find the one we want
		foreach my $subvalue (values %status){
			if ($subvalue->{"sub"} eq $1){
				$subvalue->{"max"} = $value;
			}
		}
	}
}

# get current value, matching on OID field number
while (my ($key, $value) = each(%finvalues)){
	my $search = quotemeta("$base_oid.$curr_oid");
	if ($key =~ /^$search\.([\d\.]+)$/){
		## assign it to the other variable
		## search the existing keys, find the one we want
		foreach my $subvalue (values %status){
			if ($subvalue->{"sub"} eq $1){
				$subvalue->{"curr"} = $value;
			}
		}
	}
}

# get uom, add it to data
while (my ($key, $value) = each(%finvalues)){
	my $search = quotemeta("$base_oid.$uom_oid");
	if ($key =~ /^$search\.([\d\.]+)$/){
		## assign it to the other variable
		## search the existing keys, find the one we want
		foreach my $subvalue (values %status){
			if ($subvalue->{"sub"} eq $1){
				$subvalue->{"uom"} = $uom{$value};
			}
		}
	}
}

## Assemble performance data and error string.
my $perf_str = "";
my $is_warn = 0;
my $is_crit = 0;
my $err_str = "";
while (my($key, $value) = each(%status)){
	my ($maximum, $current);
	if (!exists($value->{"curr"}) || $value->{"curr"} == -3){
		## we can process as yes/no
		$current = 100;
		## Override the critical/warning, since they're moot
		$critical = 0;
		$warning = 0;
	} elsif (($value->{"max"} == -2) and ($value->{"uom"} ne '%')){
		## we don't know (-2 == unknown) the max and can't compute
		next;
	} else {
		$maximum = $value->{"max"};
	}
	
	if (!exists($value->{"curr"}) || $value->{"curr"} < 0){
		## weird value, set to 0 for math reasons
		$current = 0;
	} else {
		$current = round(($value->{"curr"} / $maximum) * 100);
	}

	my $lcurrent;
	if (($key =~ m/waste/i) or ($key =~ m/Toneruppsamlare/i) or ($key =~ m/Restonner/i)){
		# invert the $current as waste is calculated in reverse
		if ($value->{"curr"} == -3){
			$lcurrent = 0;
		} else {
			$lcurrent = $maximum - $current;
		}
	} else {
		$lcurrent = $current;
	}
	if ($lcurrent < $critical){
		$is_crit = $is_crit + 1;
		if ($err_str eq ""){
			$err_str = "$key";
		} else {
			$err_str = "$err_str, $key";
		}
	} elsif ($lcurrent < $warning){
		$is_warn = $is_warn + 1;
		if ($err_str eq ""){
			$err_str = "$key";
		} else {
			$err_str = "$err_str, $key";
		}
	}
	if ($debug){
		print "Key: $key\nCur: $current\nWarn: $warning\nCrit: $critical\n";
	}
	$perf_str = "$perf_str '$key'=$current%;$warning;$critical;0;100 ";
}

if ($debug){
	print Dumper(\%status);
	print "\n\n############ ATTENTION ############\n";
        print "You have debug enabled.  If asked to enable debug by the Debian Maintainer,\n";
        print "please send all of the output to the Debian Bug Tracking System, either by \n";
        print "replying to an existing bug or by opening a new bug.\n";

	print '$Id: check_printer 363 2014-07-23 14:37:59Z ecrist $'."\n\n";
}
if ($is_crit){
	print "$err_str CRITICAL.  See http://$ARGV[0] | $perf_str\n";
	exit 2;
} elsif ($is_warn){
	print "$err_str WARNING. See http://$ARGV[0] | $perf_str\n";
	exit 1;
} else {
	print "Printer Supplies OK | $perf_str\n";
	exit 0;
}


###
### subroutines here
###

sub round {
	my($number) = shift;
	return int($number + .5 * ($number <=> 0));
}

__END__

=head1 check_printer

check_printer - Gather supply metrics from a printer via SNMP query

=head1 SYNOPSIS

check_printer [options]

Options:
	
	-h, --host		Printer hostname or IP address.
	-C, --community		SNMP community string, defaults to "public"
	-w, --warn		Warning threshold
	-c, --crit		Critical threshold
	-i, --ignore		Supply ignore.  See man page for more information (--man)
	-V, --version		Prints version string and exits
	-d, --debug		Prints debug output, useful when reporting a problem to the developer, or getting index numbers for --ignore
	--man			Prints man page

=head1 DESCRIPTION

B<check_printer> is a Perl script that retrieves supply metrics from printers using the snmpwalk command.

=head1 OPTIONS

=over

=item -h, --host

Defines the host or IP address passed to snmpwalk.

=item -C, --community

Identifies the SNMP community string.  Requires read access only.

=item -w, --warn

Value at which a warning is generated.  For example, if -w 10 is set, when 
supply levels fall to 10% or below, a warning will be sent as part of the 
performance data.

=item -c, --crit

Value at which a critical alert is generated.  This number should be lower
than --warn is set, but this is not enforced.

=item -i, --ignore

Supply index that should be ignore from the output.  Multiple values are 
accepted, separately:

=over

check_printer -i 1 -i 2

=back

Will exclude supply indexes 1 and 2.  To get the supply index list, run the 
check_printer utility with --debug defined and the top of the output will
list available supply metrics as follows:

=over

$VAR1 = [
    '.1.3.6.1.2.1.43.11.1.1.6.1.1 = STRING: "Black Toner"',
    '.1.3.6.1.2.1.43.11.1.1.6.1.2 = STRING: "Drum Unit"',
    '.1.3.6.1.2.1.43.11.1.1.7.1.1 = INTEGER: 13',
    '.1.3.6.1.2.1.43.11.1.1.7.1.2 = INTEGER: 7',
    '.1.3.6.1.2.1.43.11.1.1.8.1.1 = INTEGER: -2',
    '.1.3.6.1.2.1.43.11.1.1.8.1.2 = INTEGER: -2',
    '.1.3.6.1.2.1.43.11.1.1.9.1.1 = INTEGER: -3',
    '.1.3.6.1.2.1.43.11.1.1.9.1.2 = INTEGER: 0'
];

=back

In the above example, we are looking for the OID string starting with 
B<.1.3.6.1.2.1.43.11.1.1.6.1> and the index is the last number. To exclude the
Drum Unit, pass I<-i 2> to check_printer

=item -V, --version

Print the check_printer version string and exits.

=item -d, --debug

Outputs debug information.  If you are having problems with a printer or device,
send the debug output to B<ecrist@secure-computing.net> and identify your printer
model and manufacturer.

=item --man

Prints this man page.  :)