#!/usr/bin/perl -w
#
# (c)1999 Ian Cass, Knowledge Matters Ltd.
# Read the GNU copyright stuff for all the legalese
#
# Check NTP time servers plugin. This plugin requires the ntpdate utility to
# be installed on the system, however since it's part of the ntp suite, you 
# should already have it installed.
#
# $Id: check_ntp.pl 1291 2005-11-30 00:49:47Z harpermann $
#
# Nothing clever done in this program - its a very simple bare basics hack to
# get the job done.
#
# Things to do...
# check @words[9] for time differences greater than +/- x secs & return a
# warning.
#
# (c) 1999 Mark Jewiss, Knowledge Matters Limited
# 22-9-1999, 12:45
#
# Modified script to accept 2 parameters or set defaults.
# Now issues warning or critical alert is time difference is greater than the 
# time passed.
#
# These changes have not been tested completely due to the unavailability of a
# server with the incorrect time.
#
# (c) 1999 Bo Kersey, VirCIO - Managed Server Solutions <bo@vircio.com>
# 22-10-99, 12:17
#
# Modified the script to give useage if no parameters are input.
#
# Modified the script to check for negative as well as positive 
# time differences.
#
# Modified the script to work with ntpdate 3-5.93e Wed Apr 14 20:23:03 EDT 1999
#
# Modified the script to work with ntpdate's that return adjust or offset...
#
#
# Script modified 2000 June 01 by William Pietri <william@bianca.com>
#
# Modified script to handle weird cases:
#     o NTP server doesn't respond (e.g., has died)
#     o Server has correct time but isn't suitable synchronization
#           source. This happens while starting up and if contact
#           with master has been lost.
#
# Modifed to run under Embedded Perl  (sghosh@users.sf.net)
#   - combined logic some blocks together..
# 
# Added ntpdate check for stratum 16 desynch peer (James Fidell) Feb 03, 2003
#
# ntpdate - offset is in seconds
# changed ntpdc to ntpq - jitter/dispersion is in milliseconds
#
# Patch for for regex for stratum1 refid.

require 5.004;
use POSIX;
use strict;
use Getopt::Long;
use vars qw($opt_V $opt_h $opt_H $opt_t $opt_w $opt_c $opt_O $opt_j $opt_k $verbose $PROGNAME $def_jitter $ipv4 $ipv6);
use lib utils.pm;
use utils qw($TIMEOUT %ERRORS &print_revision &support);

$PROGNAME="check_ntp";

sub print_help ();
sub print_usage ();

$ENV{'PATH'}='';
$ENV{'BASH_ENV'}='';
$ENV{'ENV'}='';

# defaults in sec
my $DEFAULT_OFFSET_WARN =  60;  # 1 minute
my $DEFAULT_OFFSET_CRIT = 120;  # 2 minutes
# default in millisec
my $DEFAULT_JITTER_WARN =   5000; # 5 sec
my $DEFAULT_JITTER_CRIT =  10000; # 10 sec

Getopt::Long::Configure('bundling');
GetOptions
	("V"   => \$opt_V, "version"    => \$opt_V,
	 "h"   => \$opt_h, "help"       => \$opt_h,
	 "v"   => \$verbose, "verbose" 	=> \$verbose,
	 "4"   => \$ipv4, "use-ipv4"	=> \$ipv4,
	 "6"   => \$ipv6, "use-ipv6"	=> \$ipv6,
	 "w=f" => \$opt_w, "warning=f"  => \$opt_w,   # offset|adjust warning if above this number
	 "c=f" => \$opt_c, "critical=f" => \$opt_c,   # offset|adjust critical if above this number
	 "O"   => \$opt_O, "zero-offset" => \$opt_O,  # zero-offset  bad
	 "j=s" => \$opt_j, "jwarn=i"    => \$opt_j,   # jitter warning if above this number
	 "k=s" => \$opt_k, "jcrit=i"    => \$opt_k,   # jitter critical if above this number
	 "t=s" => \$opt_t, "timeout=i"  => \$opt_t,
	 "H=s" => \$opt_H, "hostname=s" => \$opt_H);

if ($opt_V) {
	print_revision($PROGNAME,'$Revision: 1291 $ ');