#!/usr/bin/perl -w
#
# Copyright (C) 2008 Thomas Gutzler (thomas.gutzler@gmail.com)
# original shell script by Jimmy Olsen
#
# 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.
#
#
# Plugin to monitor ping times
#
# Parameters:
#
#   ping_args      - Arguments to ping (default "-c 2 -w 1")
#   ping_args2     - Arguments after the host name (required for Solaris)
#   ping           - Ping program to use
#   hosts          - List of comma-separated hosts to ping (IP address or FQDN)
#   names          - Friendly display name of each host given in the "hosts" parameter (comma-separated list).
#                    If not set, "hosts" elements will be used
#
# Arguments for Solaris:
#      ping_args      -s
#      ping_args2     56 2
#
# Tips for very fast ping replies
#   (thanks to Alex Davies and Nicolai Langfeldt):
# Apparently, old versions of munin can't handle scientific notation of values
# so, if you're getting replies like this from your node:
# site1.value 5.2e-05
# and your graph looks like a flat line, remove the -o argument from graph_args
#
# Configuration example
# [multiping]
# env.hosts www.google.com,www.yahoo.com
# env.names Google,Yahoo
# env.ping_args -A -c 5 -w 2
#
#%# family=auto
#%# capabilities=autoconf

use strict;

my @hosts = exists $ENV{hosts} ? split(/,/, $ENV{hosts}) : 'www.google.com.au';
my @names = exists $ENV{names} ? split(/,/, $ENV{names}) : @hosts;
my $ping_cmd = exists $ENV{ping} ? $ENV{ping} : 'ping';
my $ping_args = exists $ENV{ping_args} ? $ENV{ping_args} : '-c 2 -w 1';
my $ping_args2 = exists $ENV{ping_args2} ? $ENV{ping_args2} : '';

if ($#hosts != $#names) {
  print "unequal amount of hosts and names\n";
  exit 1;
}

if ((exists $ARGV[0]) && ($ARGV[0] eq "autoconf")) {
  my @ping = `$ping_cmd $ping_args $hosts[0] $ping_args2`;
  chomp @ping;
  my $ping = join(" ", @ping);
  if ($ping =~ m@min/avg/max@) {
    print "yes\n";
  } else {
    print "no\n";
  }
  exit 0;
}

if ((exists $ARGV[0]) && ($ARGV[0] eq "config")) {
  print "graph_title Ping times\n";
  print "graph_args --base 1000 -o\n";
  print "graph_vlabel seconds\n";
  print "graph_category network\n";
  print "graph_info This graph shows ping RTT statistics.\n";
  for (my $site=1; $site<=$#hosts+1; $site++) {
    my $item = lc($hosts[$site-1]);
    $item =~ s/\.//g;
    print "$item.label $names[$site-1]\n";
    print "$item.info Ping RTT statistics for $hosts[$site-1].\n";
    print "$item.draw LINE2\n";
    print "${item}_packetloss.label $names[$site-1] packet loss\n";
    print "${item}_packetloss.graph no\n";
  }
    exit 0;
}

for (my $site=1; $site<=$#hosts+1; $site++) {
  my $item = lc($hosts[$site-1]);
  $item =~ s/\.//g;
  my $host = $hosts[$site-1];
  my @ping = `$ping_cmd $ping_args $host $ping_args2`;
  chomp @ping;
  my $ping = join(" ", @ping);
  print $item.".value ".($1 / 1000)."\n" if ($ping =~ m@min/avg/max.*\s\d+(?:\.\d+)?/(\d+(?:\.\d+)?)/\d+(?:\.\d+)?@);
  print $item."_packetloss.value $1\n" if ($ping =~ /(\d+)% packet loss/);
}