Munin contributed plugins

#!/usr/bin/perl -w

#

# Copyright (C) 2019 Alejandro Suarez (teconecta.es)

#

# Munin plugin to monitor Mikrotik routers RAM 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 ($0 =~ /^(?:|.*\/)snmp_([^_]+)_mikrotik_ram$/)

{

    $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 $sysRAMUsage     = "1.3.6.1.2.1.25.2.3.1.6.65536";

my $sysRAMTotal     = "1.3.6.1.2.1.25.2.3.1.5.65536";

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 = $session->get_request($sysRAMTotal)))

    {

        die "Croaking: " . $session->error();

    }

#    print "graph_args --base 1000 -r --lower-limit 0 --upper-limit 100\n";

    print "graph_args --base 1024 -l 0 --vertical-label Bytes --upper-limit " . ($response->{$sysRAMTotal} * 1024) . "\n";

    print "graph_title RAM usage\n";

    print "graph_category system\n";

    print "graph_info This graph shows the router's memory usage.\n";

    print "graph_order Total Used\n";

    print "graph_vlabel bytes\n";

    print "sysRAMTotal.label Total Memory\n";

    print "sysRAMTotal.draw AREA\n";

    print "sysRAMUsage.label Used Memory\n";

    print "sysRAMUsage.draw AREA\n";

    exit 0;

}

if (defined ($response = $session->get_request(-varbindlist => [$sysRAMUsage, $sysRAMTotal])))

{

        print "sysRAMUsage.value ", $response->{$sysRAMUsage}*1024, "\n";

        print "sysRAMTotal.value ", $response->{$sysRAMTotal}*1024, "\n";

}

else

{

        print "sysRAMUsage.value U\n";

}

# vim:syntax=perl