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#
# Copyright (c) 2012 Red Hat.
# Copyright (c) 2009 Aconex. All Rights Reserved.
#
# 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; either version 2 of the License, or (at your
# option) any later version.
#
# 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.
#
use strict;
use warnings;
use PCP::PMDA;
my $pmda = PCP::PMDA->new('netfilter', 97);
my $procfs = '/proc/sys/net/ipv4/';
sub netfilter_fetch_callback
{
my ($cluster, $item, $inst) = @_;
my $metric_name = pmda_pmid_name($cluster, $item);
my ($path, $name, $value, $fh, @vals);
if ($inst != PM_IN_NULL) { return (PM_ERR_INST, 0); }
if (!defined($metric_name)) { return (PM_ERR_PMID, 0); }
$metric_name =~ s/\./\//;
$name = $procfs . $metric_name;
open($fh, $name) || return (PM_ERR_APPVERSION, 0);
$value = <$fh>;
close $fh;
chomp $value;
return ($value, 1);
}
$pmda->add_metric(pmda_pmid(0,0), PM_TYPE_U32, PM_INDOM_NULL, PM_SEM_INSTANT,
pmda_units(0,0,0,0,0,0), 'netfilter.ip_conntrack_max', '', '');
$pmda->add_metric(pmda_pmid(0,1), PM_TYPE_U32, PM_INDOM_NULL, PM_SEM_INSTANT,
pmda_units(0,0,0,0,0,0), 'netfilter.ip_conntrack_count', '', '');
$pmda->set_fetch_callback(\&netfilter_fetch_callback);
$pmda->set_user('pcp');
$pmda->run;
=pod
=head1 NAME
pmdanetfilter - Linux netfilter IP connection tracking performance metrics domain agent (PMDA)
=head1 DESCRIPTION
B<pmdanetfilter> is a Performance Metrics Domain Agent (PMDA) which
exports metric values from IP connection tracking module in the Linux
kernel.
=head1 INSTALLATION
If you want access to the names and values for the netfilter performance
metrics, do the following as root:
# cd $PCP_PMDAS_DIR/netfilter
# ./Install
If you want to undo the installation, do the following as root:
# cd $PCP_PMDAS_DIR/netfilter
# ./Remove
B<pmdanetfilter> is launched by pmcd(1) and should never be executed
directly. The Install and Remove scripts notify pmcd(1) when
the agent is installed or removed.
=head1 FILES
=over
=item $PCP_PMDAS_DIR/netfilter/Install
installation script for the B<pmdanetfilter> agent
=item $PCP_PMDAS_DIR/netfilter/Remove
undo installation script for the B<pmdanetfilter> agent
=item $PCP_LOG_DIR/pmcd/netfilter.log
default log file for error messages from B<pmdanetfilter>
=back
=head1 SEE ALSO
pmcd(1).
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