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/usr/share/munin/plugins/asterisk_sippeers is in munin-plugins-extra 2.0.33-1.

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#!/usr/bin/perl -w
# -*- perl -*-

=head1 NAME

asterix_sippeers - Plugin to monitor number of sip peers registered

=head1 CONFIGURATION

The following configuration parameters are used by this plugin

 [asterisk_sippeers]
  env.host     - hostname to connect to
  env.port     - port number to connect to
  env.username - username used for authentication
  env.secret   - secret used for authentication

The "username" and "secret" parameters are mandatory, and have no
defaults.

=head2 DEFAULT CONFIGURATION

 [asterisk_sippeers]
  env.host 127.0.0.1
  env.port 5038

=head1 AUTHOR

Copyright (C) 2005 Rodolphe Quiedeville <rodolphe@quiedeville.org>

=head1 LICENSE

Gnu GPLv2

=begin comment

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.

If you improve this script please send your version to my email
address with the copyright notice upgrade with your name.

=end comment

=head1 MAGIC MARKERS

 #%# family=contrib

=cut

# #################################################################################
# Following example from current asterisk 1.4
#> sip show peers
#Name/username              Host            Dyn Nat ACL Port     Status               
#104-RANDALLBUILT/104-RAND  74.218.176.166   D          5060     Unmonitored           
#...           
#102-ROCKSOLID/102-ROCKSOL  (Unspecified)    D          0        Unmonitored           
#101-ROCKSOLID/101-ROCKSOL  (Unspecified)    D   N      0        UNKNOWN              
#20 sip peers [Monitored: 0 online, 1 offline Unmonitored: 2 online, 17 offline]
# #################################################################################

use IO::Socket;
use strict;

if ($ARGV[0] and $ARGV[0] eq "config")
{
    print "graph_title Asterisk sip peers\n";
    print "graph_args --base 1000 -l 0\n";
    print "graph_order mon moff umon umoff\n";
    print "graph_vlabel peers\n";
    print "graph_category asterisk\n";
    #print "peers.label total\n";
    print "mon.draw AREA\n";
    print "mon.label monitored online\n";
    print "moff.draw STACK\n";
    print "moff.label monitored offline\n";
    print "umon.draw STACK\n";
    print "umon.label unmonitored online\n";
    print "umoff.draw STACK\n";
    print "umoff.label unmonitored offline\n";
    #graph_scale no
    #load.warning 10
    #load.critical 120
    #graph_info The ... describes ....
    #load.info Average load for the five minutes.
    exit 0;
}

my $host = exists $ENV{'host'} ? $ENV{'host'} : "127.0.0.1";
my $port = exists $ENV{'port'} ? $ENV{'port'} : "5038";

my $username = $ENV{'username'};
my $secret   = $ENV{'secret'};

my $pop = new IO::Socket::INET (PeerAddr => $host,
				PeerPort => $port,
				Proto => 'tcp');
die "Could not create socket: $!\n" unless $pop;

## Read connection message.
my $line = $pop->getline;
die $line unless $line =~ /^Asterisk/;

## Send user name.
$pop->print("Action: login\n");
$pop->print("Username: $username\n");
$pop->print("Secret: $secret\n");
$pop->print("Events: off\n");
$pop->print("\n");

#Response: Success
#Message: Authentication accepted

## Request status of messages.
$pop->print("Action: command\n");
$pop->print("Command: sip show peers\n");
$pop->print("\n");

my ($peers,$monitor_online,$monitor_offline,$unmonitor_online,$unmonitor_offline)=(0,0,0,0,0);

while (($line = $pop->getline) and ($line !~ /END COMMAND/o))
{
    my @fields = split(' ', $line);
    my $count = @fields;
    #20 sip peers [Monitored: 0 online, 1 offline Unmonitored: 2 online, 17 offline]
    if (($count > 10) and ($fields[1] eq 'sip' and $fields[2] eq 'peers')) {
	$peers = $fields[0];
	$monitor_online = $fields[4];
	$monitor_offline = $fields[6];
	$unmonitor_online = $fields[9];
	$unmonitor_offline = $fields[11];
	#print STDERR "$peers $monitor_online $monitor_offline $unmonitor_online $unmonitor_offline\n";
	last;
    }
}

$pop->print("Action: logoff\n");
$pop->print("\n");

## Exhaust buffer before closing (to avoid polluting Asterisk's logs)
while ($line = $pop->getline) {}

#print "peers.value $peers\n";
print "mon.value $monitor_online\n";
print "moff.value $monitor_offline\n";
print "umon.value $unmonitor_online\n";
print "umoff.value $unmonitor_offline\n";

# vim:syntax=perl