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#! /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.
#
# $Id$
#
# 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..
#
# Todo - non-hardcoded dispersion values...
#
require 5.004;
use POSIX;
use strict;
use Getopt::Long;
use vars qw($opt_V $opt_h $opt_H $opt_w $opt_c $verbose $PROGNAME);
use lib utils.pm ;
use utils qw($TIMEOUT %ERRORS &print_revision &support);
$PROGNAME="check_ntp";
sub print_help ();
sub print_usage ();
$ENV{'PATH'}='';
$ENV{'BASH_ENV'}='';
$ENV{'ENV'}='';
Getopt::Long::Configure('bundling');
GetOptions
("V" => \$opt_V, "version" => \$opt_V,
"h" => \$opt_h, "help" => \$opt_h,
"v" => \$verbose, "verbose" => \$verbose,
"w=s" => \$opt_w, "warning=s" => \$opt_w, # offset|adjust warning if above this number
"c=s" => \$opt_c, "critical=s" => \$opt_c, # offset|adjust critical if above this number
"H=s" => \$opt_H, "hostname=s" => \$opt_H);
if ($opt_V) {
print_revision($PROGNAME,'$Revision$ ');
exit $ERRORS{'OK'};
}
if ($opt_h) {
print_help();
exit $ERRORS{'OK'};
}
$opt_H = shift unless ($opt_H);
my $host = $1 if ($opt_H && $opt_H =~ m/^([0-9]+\.[0-9]+\.[0-9]+\.[0-9]+|[a-zA-Z][-a-zA-Z0-9]+(\.[a-zA-Z][-a-zA-Z0-9]+)*)$/);
unless ($host) {
print "No target host specified\n";
print_usage();
exit $ERRORS{'UNKNOWN'};
}
($opt_w) || ($opt_w = shift) || ($opt_w = 60);
my $warning = $1 if ($opt_w =~ /([0-9]+)/);
($opt_c) || ($opt_c = shift) || ($opt_c = 120);
my $critical = $1 if ($opt_c =~ /([0-9]+)/);
if ($opt_c < $opt_w) {
print "Critical offset should be larger than warning offset\n";
print_usage();
exit $ERRORS{"UNKNOWN"};
}
my $answer = undef;
my $offset = undef;
my $msg; # first line of output to print if format is invalid
my $state = $ERRORS{'UNKNOWN'};
my $ntpdate_error = $ERRORS{'UNKNOWN'};
my $dispersion_error = $ERRORS{'UNKNOWN'};
my $key = undef;
# Just in case of problems, let's not hang Nagios
$SIG{'ALRM'} = sub {
print ("ERROR: No response from ntp server (alarm)\n");
exit $ERRORS{"UNKNOWN"};
};
#alarm($TIMEOUT);
###
###$dispersion_error = $ERRORS{'
### First, check ntpdate
###
###
if (!open (NTPDATE, "$utils::PATH_TO_NTPDATE -q $host 2>&1 |")) {
print "Could not open ntpdate\n";
exit $ERRORS{"UNKNOWN"};
}
while (<NTPDATE>) {
print if ($verbose);
$msg = $_ unless ($msg);
if (/(offset|adjust)\s+([-.\d]+)/i) {
$offset = $2;
# An offset of 0.000000 with an error is probably bogus. Actually,
# it's probably always bogus, but let's be paranoid here.
if ($offset == 0) { undef $offset;}
$ntpdate_error = defined ($offset) ? $ERRORS{"OK"} : $ERRORS{"CRITICAL"};
print "ntperr = $ntpdate_error \n" if $verbose;
}
if (/no server suitable for synchronization found/) {
$ntpdate_error = $ERRORS{"CRITICAL"};
$msg = "No suitable peer server found - ";
}
}
close (NTPDATE);
# declare an error if we also get a non-zero return code from ntpdate
# unless already set to critical
if ( $? ) {
print "stderr = $? : $! \n" if $verbose;
$ntpdate_error = $ntpdate_error == $ERRORS{"CRITICAL"} ? $ERRORS{"CRITICAL"} : $ERRORS{"UNKNOWN"} ;
print "ntperr = $ntpdate_error : $!\n" if $verbose;
}
###
###
### Then scan xntpdc/ntpdc if it exists
### and look in the 8th column for dispersion (ntpd v4) or jitter (ntpd v3)
###
if ( open(NTPDC,"$utils::PATH_TO_NTPDC -s $host 2>&1 |") ) {
while (<NTPDC>) {
print $_ if ($verbose);
if (/([^\s]+)\s+([-0-9.]+)\s+([-0-9.]+)\s+([-0-9.]+)\s+([-0-9.]+)\s+([-0-9.]+)\s+([-0-9.]+)\s+([-0-9.]+)/) {
if ($8>15) {
print "Dispersion = $8 \n" if ($verbose);
$dispersion_error = $ERRORS{'CRITICAL'};
} elsif ($8>5 && $dispersion_error<$ERRORS{'CRITICAL'}) {
print "Dispersion = $8 \n" if ($verbose);
$dispersion_error = $ERRORS{'WARNING'};
} else {
$dispersion_error = $ERRORS{'OK'};
}
}
}
close NTPDC;
}
if ($ntpdate_error != $ERRORS{'OK'}) {
$state = $ntpdate_error;
$answer = $msg . "Server for ntp probably down\n";
if (defined($offset) && abs($offset) > $critical) {
$state = $ERRORS{'CRITICAL'};
$answer = "Server Error and time difference $offset seconds greater than +/- $critical sec\n";
} elsif (defined($offset) && abs($offset) > $warning) {
$answer = "Server error and time difference $offset seconds greater than +/- $warning sec\n";
}
} elsif ($dispersion_error != $ERRORS{'OK'}) {
$state = $dispersion_error;
$answer = "Dispersion too high\n";
if (defined($offset) && abs($offset) > $critical) {
$state = $ERRORS{'CRITICAL'};
$answer = "Dispersion error and time difference $offset seconds greater than +/- $critical sec\n";
} elsif (defined($offset) && abs($offset) > $warning) {
$answer = "Dispersion error and time difference $offset seconds greater than +/- $warning sec\n";
}
} else { # no errors from ntpdate or xntpdc
if (defined $offset) {
if (abs($offset) > $critical) {
$state = $ERRORS{'CRITICAL'};
$answer = "Time difference $offset seconds greater than +/- $critical sec\n";
} elsif (abs($offset) > $warning) {
$state = $ERRORS{'WARNING'};
$answer = "Time difference $offset seconds greater than +/- $warning sec\n";
} elsif (abs($offset) <= $warning) {
$state = $ERRORS{'OK'};
$answer = "Time difference $offset seconds\n";
}
} else { # no offset defined
$state = $ERRORS{'UNKNOWN'};
$answer = "Invalid format returned from ntpdate ($msg)\n";
}
}
foreach $key (keys %ERRORS) {
if ($state==$ERRORS{$key}) {
print ("$key: $answer");
last;
}
}
exit $state;
sub print_usage () {
print "Usage: $PROGNAME -H <host> [-w <warn>] [-c <crit>]\n";
}
sub print_help () {
print_revision($PROGNAME,'$Revision$');
print "Copyright (c) 2000 Bo Kersey/Karl DeBisschop\n";
print "\n";
print_usage();
print "\n";
print "<warn> = Clock offset in seconds at which a warning message will be generated.\n Defaults to 60.\n";
print "<crit> = Clock offset in seconds at which a critical message will be generated.\n Defaults to 120.\n\n";
support();
}
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