#!/usr/bin/perl -w
#
# Copyright (C) Rune Nordboe Skillingstad, Sveinung Marvik
# Reports supplies (ie. toner level) on printers adhering to RFC1759
#
# 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; version 2 dated June,
# 1991.
#
# 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., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
#
#
#
# Graphs supplies of HP printers  (toner/ink)
#
# downloaded by Peter Palfrader from http://munin.projects.linpro.no/wiki/plugin-snmp__supplies
# Wed,  9 Aug 2006 16:48:17 +0200
#
#%# family=snmpauto
#%# capabilities=snmpconf

use strict;
use Net::SNMP;

my $DEBUG     = $ENV{'DEBUG'} || 0;
my $MAXLABEL  = 20;

my $host      = $ENV{host}      || undef;
my $port      = $ENV{port}      || 161;
my $community = $ENV{community} || "public";
my $iface     = $ENV{interface} || undef;
my $timeout   = $ENV{timeout}   || 1;
my $warning   = $ENV{warning}   || 10;
my $critical  = $ENV{critical}  || 5;

my %cache;
my %supplies;

if(defined $ARGV[0] and $ARGV[0] eq "snmpconf") {
    print "require 1.3.6.1.2.1.43.11.1.1.6.1.1\n";
    print "require 1.3.6.1.2.1.43.11.1.1.8.1.1 ^\\d\n";
    print "require 1.3.6.1.2.1.43.11.1.1.9.1.1 ^\\d\n";
    exit 0;
}

if($0 =~ /^(?:|.*\/)snmp_([^_]+)_supplies$/) {
    $host  = $1;
    if($host =~ /^([^:]+):(\d+)$/) {
	$host = $1;
	$port = $2;
    }
}
elsif(!defined($host)) {
    print "# Debug: $0 -- $1\n" if $DEBUG;
    die "# Error: couldn't understand what I'm supposed to monitor.";
}

my ($session, $error) = Net::SNMP->session(
    -hostname  => $host,
    -community => $community,
    -port      => $port,
    -timeout   => $timeout
);

if(!defined ($session)) {
    die "Croaking: $error";
}

&get_multiple ($session, "1.3.6.1.2.1.43.11.1.1.6", "desc");
&get_multiple ($session, "1.3.6.1.2.1.43.11.1.1.8", "max");
&get_multiple ($session, "1.3.6.1.2.1.43.11.1.1.9", "level");
&wash_data;

# Configure
if(defined $ARGV[0] and $ARGV[0] eq "config") {
    print "host_name $host\n";
    print "graph_title Supply Level\n";
    print "graph_args --base 1000 -l 0 --upper-limit 100\n";
    print "graph_vlabel %\n";
    print "graph_scale no";
    print "graph_category other\n";
    print "graph_info This graph represents supplies level\n";
    
    foreach my $supply (keys(%supplies)) {
	print "supply$supply.label ".(length($supplies{$supply}{desc})<=$MAXLABEL ? $supplies{$supply}{desc} : substr($supplies{$supply}{desc},0,($MAXLABEL-3)))."...";
	print "\n";
	print "supply$supply.draw LINE1\n";
	print "supply$supply.info ".$supplies{$supply}{desc}."\n";
	print "supply$supply.warning $warning:100\n";
	print "supply$supply.critical $critical:100\n";
    }
    
    exit 0;
}

# Values
if (keys(%supplies) > 0) {
    foreach my $supply (keys(%supplies)) {
	printf "supply%s.value %.2f\n",$supply,
	  ($supplies{$supply}{level}/$supplies{$supply}{max})*100;
    }
}

sub get_multiple {
    my $handle = shift;
    my $oid    = shift;
    my $type   = shift;
    
    print "# Getting table $oid...\n" if $DEBUG;
    
    my $response = $handle->get_table($oid);

    if(!defined($response)) {
	return "";
    } else {
	foreach my $key (keys(%{$response})) {
	    $supplies{&keyname($key)}{$type} = $response->{$key};
	    print "$key -> ".$response->{$key}."\n" if $DEBUG;
	}
    }
}

sub keyname {
    my $key = shift;
    if (defined $cache{$key}) {
	return $cache{$key};
    }
    
    my $tkey = $key;

    $tkey =~ s/.*(\d+\.\d+)$/$1/;
    $tkey =~ s/\./_/;
    $cache{$key} = $tkey;

    return $tkey;
}

sub wash_data {
    # Get rid of supply-levels reporting negative values
    foreach my $supply (keys (%supplies)) {
	if ($supplies{$supply}{level} < 0) {
	    delete $supplies{$supply};
	    print "# Deleting entry $supply: supply level unknown.\n" if $DEBUG;
	}
    }
}