#!/usr/bin/perl -w
#
# Copyright (C) 2019 Alejandro Suarez (teconecta.es)
#
# Munin plugin to monitor Mikrotik routers Falsh disk utilization.
# Based on snmp__if_  plugin.
#
# 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.


#%# family=snmpauto
#%# capabilities=snmpconf

use strict;
use Net::SNMP;

my $DEBUG = 0;

my $host      = $ENV{host}      || undef;
my $port      = $ENV{port}      || 161;
my $community = $ENV{community} || "public";

my $response;

if (defined $ARGV[0] and $ARGV[0] eq "snmpconf")
{
    print "require 1.3.6.1.2.1.25.2.3.1.5.65536 \n";
    exit 0;
}

if ($0 =~ /^(?:|.*\/)snmp_([^_]+)_mikrotik_flash$/)
{
    $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 $sysFlashUsage     = "1.3.6.1.2.1.25.2.3.1.6.131072";
my $sysFlashTotal     = "1.3.6.1.2.1.25.2.3.1.5.131072";

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


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


if ($ARGV[0] and $ARGV[0] eq "config")
{
    print "host_name $host\n";
    if (!defined ($response = $session->get_request($sysFlashTotal)))
    {
        die "Croaking: " . $session->error();
    }
    print "graph_args --base 1024 -l 0 --vertical-label Bytes --upper-limit " . ($response->{$sysFlashTotal} * 1024) . "\n";
    print "graph_title Flash disk usage\n";
    print "graph_category system\n";
    print "graph_info This graph shows the router's flash disk usage.\n";
    print "graph_order Total Used\n";
    print "graph_vlabel bytes\n";
    print "sysFlashTotal.label Total Memory\n";
    print "sysFlashTotal.draw AREA\n";
    print "sysFlashUsage.label Used Memory\n";
    print "sysFlashUsage.draw AREA\n";
    exit 0;
}


if (defined ($response = $session->get_request(-varbindlist => [$sysFlashUsage, $sysFlashTotal])))
{
        print "sysFlashUsage.value ", $response->{$sysFlashUsage}*1024, "\n";
        print "sysFlashTotal.value ", $response->{$sysFlashTotal}*1024, "\n";
}
else
{
        print "sysFlashUsage.value U\n";
        print "sysFlashTotal.value U\n";
}

# vim:syntax=perl