Munin contributed plugins

#!/usr/bin/perl -w

=head1 NAME

openvpn_multi - Plugin for monitoring OpenVPN users traffic

=head1 CONFIGURATION

  [openvpn_multi]

    user root

    env.statusfile /var/log/openvpn.status

=head1 AUTHOR

Copyright 2013 Pierre Schweitzer <pierre@reactos.org>

=head1 LICENSE

GNU GPL v2 or any later version

=head1 MAGIC MARKERS

 #%# family=auto

 #%# capabilities=autoconf

=cut

use strict;

use Munin::Common::Defaults;

use Munin::Plugin;

my $statusfile = ($ENV{'statusfile'} || '/var/log/openvpn.status');

sub config {

	open FILE, $statusfile or die $!;

	print "multigraph openvpn_users\n";

	print "graph_title OpenVPN traffic\n";

	print "graph_args --base 1024 --lower-limit 0\n";

	print "graph_vlabel Bytes Out (-) / In (+) per \${graph_period}\n";

	print "graph_category network\n";

	print "in.label recv\n";

	print "in.type DERIVE\n";

	print "in.min 0\n";

	print "in.graph no\n";

	print "in.cdef in,1,*\n";

	print "out.label Bps\n";

	print "out.type DERIVE\n";

	print "out.min 0\n";

	print "out.negative in\n";

	print "out.cdef out,1,*\n";

	while (<FILE>) {

		next if ($_ =~ /CLIENT LIST/ || $_ =~ /Updated/ || $_ =~ /Common Name/);

		last if ($_ =~ /ROUTING TABLE/);

		# client,IP:port,in,out,D M N hour Y

		my @values = split(',', $_);

		my $name = $values[0];

		my $fieldname = clean_fieldname($name);

		print "multigraph openvpn_users.$fieldname\n";

		print "graph_title OpenVPN traffic for $name\n";

		print "graph_args --base 1024 --lower-limit 0\n";

		print "graph_vlabel Bytes Out (-) / In (+) per \${graph_period}\n";

		print "graph_category network\n";

		print "in.label recv\n";

		print "in.type DERIVE\n";

		print "in.min 0\n";

		print "in.graph no\n";

		print "in.cdef in,1,*\n";

		print "out.label Bps\n";

		print "out.type DERIVE\n";

		print "out.min 0\n";

		print "out.negative in\n";

		print "out.cdef out,1,*\n";

	}

	close FILE;

	exit 0;

}

sub autoconf {

	if (-e $statusfile) {

		print "yes\n";

		exit 0;

	} else {

		print "no\n";

		exit 1;

	}

}

sub report {

	my %in;

	my %out;

	my $tot_in = 0;

	my $tot_out = 0;

	my %previous_state = restore_state();

	my %new_state;

	open FILE, $statusfile or die $!;

	while (<FILE>) {

		next if ($_ =~ /CLIENT LIST/ || $_ =~ /Updated/ || $_ =~ /Common Name/);

		last if ($_ =~ /ROUTING TABLE/);

		# client,IP:port,in,out,D M N hour Y

		my @values = split(',', $_);

		my $name = $values[0];

		my $in = 0;

		my $out = 0;

		if (exists $previous_state{$name."_in"} && exists $previous_state{$name."_out"}) {

			my $old_in = $previous_state{$name."_in"};

			my $old_out = $previous_state{$name."_out"};

			if ($old_in <= $values[2] && $old_out <= $values[3]) {

				$in = $values[2] - $old_in;

				$out = $values[3] - $old_out;

			}

		}

		$in{$name} = $in;

		$out{$name} = $out;

		$tot_in += $in;

		$tot_out += $out;

		$new_state{$name."_in"} = $values[2];

		$new_state{$name."_out"} = $values[3];

	}

	close FILE;

	print "multigraph openvpn_users\n";

	if (exists $previous_state{"total.in"} && exists $previous_state{"total.out"}) {

		my $old_tot_in = $previous_state{"total.in"};

		my $old_tot_out = $previous_state{"total.out"};

		if ($old_tot_in <= $tot_in && $old_tot_out <= $tot_out) {

			print "in.value $tot_in\n";

			print "out.value $tot_out\n";

		} else {

			print "in.value 0\n";

			print "out.value 0\n";

		}

	}  else {

		print "in.value 0\n";

		print "out.value 0\n";

	}

	$new_state{"total.in"} = $tot_in;

	$new_state{"total.out"} = $tot_out;

	save_state(%new_state);

	for my $name (keys %in) {

		my $in = $in{$name};

		my $out = $out{$name};

		my $fieldname = clean_fieldname($name);

		print "multigraph openvpn_users.$fieldname\n";

		print "in.value $in\n";

		print "out.value $out\n";

	}

	exit 0;

}

if ($ARGV[0]) {

	my $arg = $ARGV[0];

	my %funcs = (

		config   => \&config,

		autoconf => \&autoconf,

	);

	if (exists $funcs{$arg}) {

		$funcs{$arg}->();

	} else {

		die "Unknown argument '$arg'\n";

	}

} else {

	report();

}