#!/usr/bin/perl -w
#

=head1 NAME

snmp__fc_if_ - Plugin to fetch fibrechannel data from remote hosts via
SNMP.

=head1 CONFIGURATION

The following environment variables are used by this plugin:

 host      - SNMP host (default taken from plugin link name)
 port      - SNMP port (default 161)
 community - SNMP community (default "private")
 interface - Fibrechannel interface to monitor (default taken from
             plugin link name)

=head1 AUTHOR

Copyright (C) 2004 Jimmy Olsen

=head1 LICENSE

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., 51 Franklin Street, Fifth Floor, Boston, MA
02110-1301 USA.

=head1 MAGIC MARKERS

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

=cut

use strict;

use Net::SNMP;
use Munin::Plugin::SNMP;

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

my $response;

if (defined $ARGV[0] and $ARGV[0] eq "snmpconf")
{
	print "index   1.3.6.1.2.1.8888.1.1.6.1.1.16.0.8.0.136.3.52.64.0.0.0.0.0.0.0.0.\n";
	print "require 1.3.6.1.2.1.8888.1.1.6.1.5.16.0.8.0.136.3.52.64.0.0.0.0.0.0.0.0. ^2\$\n"; # state = online
	print "require 1.3.6.1.2.1.8888.1.1.6.1.14.16.0.8.0.136.3.52.64.0.0.0.0.0.0.0.0. [1-9]\n"; # Speed
	exit 0;
}

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

my $fcEntryDescr     = "1.3.6.1.2.1.8888.1.1.6.1.16.16.0.8.0.136.3.52.64.0.0.0.0.0.0.0.0.$iface";
my $fcEntrySpeed     = "1.3.6.1.2.1.8888.1.1.6.1.14.16.0.8.0.136.3.52.64.0.0.0.0.0.0.0.0.$iface";
my $fcEntryStatus    = "1.3.6.1.2.1.8888.1.1.6.1.6.16.0.8.0.136.3.52.64.0.0.0.0.0.0.0.0.$iface";
my $fcEntryInOctets  = "1.3.6.1.2.1.8888.1.3.1.1.6.16.0.8.0.136.3.52.64.0.0.0.0.0.0.0.0.$iface";
my $fcEntryOutOctets = "1.3.6.1.2.1.8888.1.3.1.1.5.16.0.8.0.136.3.52.64.0.0.0.0.0.0.0.0.$iface";
my $fcPhysPort       = "1.3.6.1.2.1.8888.1.1.6.1.17.16.0.8.0.136.3.52.64.0.0.0.0.0.0.0.0.$iface";

my ($session, $error) = Net::SNMP->session(
		-hostname  => $host,
		-community => $community,
		-port      => $port,
		-version   => "2c"
	);

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

if ($ARGV[0] and $ARGV[0] eq "config")
{
	print "host_name $host\n" unless $host eq 'localhost';
	if (!defined ($response = $session->get_request($fcEntryDescr)))
	{
		die "Croaking: " . $session->error();
	}
	my $name = $response->{$fcEntryDescr};
	if (defined ($response = $session->get_request($fcPhysPort)))
	{
		$name .= " (" . $response->{$fcPhysPort} . ")";
	}
	my $warn = undef;
	if (defined ($response = $session->get_request($fcEntrySpeed)))
	{
		$warn = $response->{$fcEntrySpeed}*8000;
	}
	print "graph_title FC $name traffic\n";
	print "graph_order recv send\n";
	print "graph_args --base 1000\n";
	print "graph_vlabel bits in (-) / out (+) per \${graph_period}\n";
	print "graph_category network\n";
	print "graph_info This graph shows network usage for fibrechannel controllers.\n";
	print "send.info Bits sent/received by this interface.\n";
	print "recv.label recv\n";
	print "recv.type DERIVE\n";
	print "recv.min 0\n";
	print "recv.graph no\n";
	print "recv.cdef recv,8,*\n";
	print "recv.max 4000000000\n";
	print "recv.warning $warn\n" if defined $warn;
	print "send.label bps\n";
	print "send.type DERIVE\n";
	print "send.min 0\n";
	print "send.negative recv\n";
	print "send.cdef send,8,*\n";
	print "send.max 4000000000\n";
	print "send.warning $warn\n" if defined $warn;
	exit 0;
}

my $status = 1;
if (defined ($response = $session->get_request($fcEntryStatus)))
{
	$status = $response->{$fcEntryStatus};
}

if ($status != 3)
{
	print "recv.value U\n";
	print "send.value U\n";
	exit 0;
}

if (defined ($response = $session->get_request($fcEntryInOctets)))
{
	print "recv.value ", $response->{$fcEntryInOctets}, "\n";
}
else
{
	print "recv.value U\n";
}

if (defined ($response = $session->get_request($fcEntryOutOctets)))
{
	print "send.value ", $response->{$fcEntryOutOctets}, "\n";
}
else
{
	print "send.value U\n";
}