#!/usr/bin/perl -w
#
# Copyright (C) 2005 Rodolphe Quiedeville <rodolphe@quiedeville.org>
#
# 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., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
#
# If you improve this script please send your version to my email address
# with the copyright notice upgrade with your name.
#
#
# $Log$
#
# Revision 1.3	2016/10/12 20:12:17 -0400	Etienne Lessard <elessard@proformatique.com>
#   Update plugin to work with asterisk >= 14
#
# Revision 1.2  2010/11/04 10:11     Guillaume Bour <gbour@proformatique.com>
#   Allow channels monitoring per device (IAX/SIP/... account or trunk).
#   To monitor a particular device, link asterisk_channels_tech_identifier to this file, where:
#     - tech is one of SIP, IAX, DAHDI, ...
#     - identifier is account name (102, foo, ...)
#
#   i.e:
#     ls -s /path/to/asterisk_channels /etc/munin/plugins/asterisk_channels_SIP_trunk1
#   will monitor SIP/trunk1 device
#
# Revision 1.1  2005/10/22 21:04:01  rodo
# Created by Rodolphe Quiedeville
#

# Parameters mandatory:
#
# 	username
# 	secret
#
#%# family=asterisk
#%# capabilities=autoconf

use strict;

my $ret = undef;
if (! eval "require Net::Telnet;")
{
    $ret = "Net::Telnet not found";
}

my $DEVICE=`basename $0`;
if ($DEVICE =~ /^asterisk_channels_([^_]+)_(.*)$/)
{ $DEVICE = "$1/$2"; }
else
{ $DEVICE = ''; }


if ($ARGV[0] and $ARGV[0] eq "config")
{
    print "graph_title Asterisk $DEVICE active channels\n";
    print "graph_args --base 1000 -l 0\n";
    print "graph_vlabel channels\n";
    print "graph_category asterisk\n";
    print "channels.draw AREA\n";
    print "channels.label channels\n";
    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 Net::Telnet (Telnetmode => 0);
$pop->open(Host => $host,
	   Port => $port);

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

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

#Response: Success
#Message: Authentication accepted
while (($line = $pop->getline) and ($line ne "\n"))
{}

## Request status of messages.
$pop->print("Action: command");
$pop->print("Command: core show channels");
$pop->print("");
my $result;
my $nb = 0;
while (($line = $pop->getline) and ($line ne "\n"))
{
    #print $line;
    if ($line =~ s/^Output: //) {
        $nb++ if $line =~ /^$DEVICE/;
        $result = $line if $line =~ /active channel/;
    }
}

$nb = (split ' ',$result)[0] if length($DEVICE) == 0;
$pop->print("Action: logoff");
$pop->print("");
while ($line = $pop->getline)
{}
$pop->close();

print "channels.value $nb\n";

# vim:syntax=perl
