Munin contributed plugins

#!/usr/bin/perl -w

=head1 NAME

snmp__mikrotik - monitor Mikrotik routers via SNMP

=head1 APPLICABLE SYSTEMS

Mikrotik Routers

=head1 CONFIGURATION

As a rule SNMP plugins need site specific configuration.  The default

configuration (shown here) will only work on insecure sites/devices.

   [snmp_*]

        env.version 2

        env.community public

=head1 MAGIC MARKERS

#%# family=snmpauto

#%# capabilities=snmpconf

=head1 BUGS

None known.

=head1 AUTHOR

Copyright (C) 2020 Alejandro Suarez (teconecta.es)

Based on snmp__if_  plugin.

=head1 LICENSE

GPLv2.

=cut

use strict;

use Net::SNMP;

my $DEBUG = 0;

my $host      = $ENV{host}      || undef;

my $port      = $ENV{port}      || 161;

my $community = $ENV{community} || "public";

my $sysFlashUsageOID = "1.3.6.1.2.1.25.2.3.1.6.131072";

my $sysFlashTotalOID = "1.3.6.1.2.1.25.2.3.1.5.131072";

my $sysRAMUsageOID = "1.3.6.1.2.1.25.2.3.1.6.65536";

my $sysRAMTotalOID = "1.3.6.1.2.1.25.2.3.1.5.65536";

my $response;

if (defined $ARGV[0] and $ARGV[0] eq "snmpconf") {

    print "require $sysFlashUsageOID\n";

    print "require $sysFlashTotalOID\n";

    print "require $sysRAMUsageOID\n";

    print "require $sysRAMTotalOID\n";

    exit 0;

}

if ($0 =~ /^(?:|.*\/)snmp_([^_]+)_mikrotik$/) {

    $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

        );

die "Croaking: $error" unless (defined ($session));

if ($ARGV[0] and $ARGV[0] eq "config") {

    print "host_name $host\n";

    $response = $session->get_request($sysFlashTotalOID);

    if (defined $response) {

        print "multigraph flash\n";

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

    }

    $response = $session->get_request($sysRAMTotalOID);

    if (defined $response) {

        print "multigraph ram\n";

        print "graph_args --base 1024 -l 0 --vertical-label Bytes --upper-limit " . ($response->{$sysRAMTotalOID} * 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 unless (($ENV{MUNIN_CAP_DIRTYCONFIG} || 0) == 1);

}

print "multigraph flash\n";

$response = $session->get_request(-varbindlist => [$sysFlashUsageOID, $sysFlashTotalOID]);

if (defined $response) {

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

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

} else {

        print "sysFlashUsage.value U\n";

        print "sysFlashTotal.value U\n";

}

print "multigraph ram\n";

$response = $session->get_request(-varbindlist => [$sysRAMUsageOID, $sysRAMTotalOID]);

if (defined $response) {

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

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

} else {

        print "sysRAMUsage.value U\n";

        print "sysRAMTotal.value U\n";

}

# vim:syntax=perl