/usr/lib/xymon/client/ext/cntrk is in hobbit-plugins 20160122.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 | #!/usr/bin/perl
# Copyright (C) 2015 Axel Beckert <abe@debian.org>
#
# Based on the generic hobbit plugin template by Christoph Berg.
#
# Permission is hereby granted, free of charge, to any person
# obtaining a copy of this software and associated documentation
# files (the "Software"), to deal in the Software without
# restriction, including without limitation the rights to use,
# copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the
# Software is furnished to do so, subject to the following
# conditions:
#
# The above copyright notice and this permission notice shall be
# included in all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
# OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
# HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
# WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
# FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
# OTHER DEALINGS IN THE SOFTWARE.
use strict;
use warnings;
use Hobbit;
use File::Slurp;
# Configuration, thresholds in percent
my $yellow = 80;
my $red = 90;
my $nf_prefix = '/proc/sys/net/netfilter/nf_conntrack_';
# Initialisation
$ENV{'PATH'} = '/bin:/sbin:/usr/bin:/usr/sbin';
$ENV{'LC_ALL'} = 'C';
delete @ENV{'IFS', 'CDPATH', 'ENV', 'BASH_ENV'};
# Check if connection tracking is there and get the values
sub get_nf_conntrack_value {
my $key = shift;
my $file = $nf_prefix.$key;
my $value = undef;
if (-r $file) {
$value = read_file($file);
chomp($value);
}
return $value;
}
my $max = get_nf_conntrack_value('max');
exit 0 unless defined($max);
my $count = get_nf_conntrack_value('count');
unless (defined($count)) {
warn "nf_conntrack_max with value, but nf_conntrack_count without. Setting to zero.";
$count = 0;
}
my $bb = new Hobbit('cntrk');
my $data = Hobbit::trends();
# Threshold checks and colors
$bb->print("\n");
my $yellow_max = $max * $yellow / 100;
my $red_max = $max * $red / 100;
$bb->color_line($count >= $red_max ? 'red' :
$count >= $yellow_max ? 'yellow' :
'green',
sprintf("%i connections tracked of maximal %i (%i%%).\n",
$count, $max, $count*100/$max));
# Data for graphs
$data->print("[cntrk.rrd]\n");
$data->print("DS:count:GAUGE:600:U:U $count\n");
$data->print("DS:max:GAUGE:600:U:U $max\n");
$bb->graph('cntrk');
$bb->send;
$data->send;
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