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monitoring-plugins/plugins-scripts/check_ntp.pl
Monitoring Plugins Development Team 63734f52ab Project rename initial commit. 
This is an initial take at renaming the project to Monitoring Plugins.
It's not expected to be fully complete, and it is expected to break
things (The perl module for instance). More testing will be required
before this goes mainline.
2014-01-19 14:18:47 -05:00

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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.
#
#
# 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,'@NP_VERSION@');
exit $ERRORS{'OK'};
}
if ($opt_h) {
print_help();
exit $ERRORS{'OK'};
}
# jitter test params specified
if (defined $opt_j || defined $opt_k ) {
$def_jitter = 1;
}
$opt_H = shift unless ($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 $ERRORS{'UNKNOWN'};
}
my ($timeout, $owarn, $ocrit, $jwarn, $jcrit);
$timeout = $TIMEOUT;
($opt_t) && ($opt_t =~ /^([0-9]+)$/) && ($timeout = $1);
$owarn = $DEFAULT_OFFSET_WARN;
($opt_w) && ($opt_w =~ /^([0-9.]+)$/) && ($owarn = $1);
$ocrit = $DEFAULT_OFFSET_CRIT;
($opt_c) && ($opt_c =~ /^([0-9.]+)$/) && ($ocrit = $1);
$jwarn = $DEFAULT_JITTER_WARN;
($opt_j) && ($opt_j =~ /^([0-9]+)$/) && ($jwarn = $1);
$jcrit = $DEFAULT_JITTER_CRIT;
($opt_k) && ($opt_k =~ /^([0-9]+)$/) && ($jcrit = $1);
if ($ocrit < $owarn ) {
print "Critical offset should be larger than warning offset\n";
print_usage();
exit $ERRORS{"UNKNOWN"};
}
if ($def_jitter) {
if ($opt_k < $opt_j) {
print "Critical jitter should be larger than warning jitter\n";
print_usage();
exit $ERRORS{'UNKNOWN'};
}
}
my $stratum = -1;
my $ignoreret = 0;
my $answer = undef;
my $offset = undef;
my $jitter = undef;
my $syspeer = undef;
my $candidate = 0;
my @candidates;
my $msg; # first line of output to print if format is invalid
my $state = $ERRORS{'UNKNOWN'};
my $ntpdate_error = $ERRORS{'UNKNOWN'};
my $jitter_error = $ERRORS{'UNKNOWN'};
# some systems don't have a proper ntpq (migrated from ntpdc)
my $have_ntpq = undef;
if ($utils::PATH_TO_NTPQ && -x $utils::PATH_TO_NTPQ ) {
$have_ntpq = 1;
}else{
$have_ntpq = 0;
}
# Just in case of problems, let's not hang the monitoring system
$SIG{'ALRM'} = sub {
print ("ERROR: No response from ntp server (alarm)\n");
exit $ERRORS{"UNKNOWN"};
};
alarm($timeout);
# Determine protocol to be used for ntpdate and ntpq
my $ntpdate = $utils::PATH_TO_NTPDATE;
my $ntpq = $utils::PATH_TO_NTPQ;
if ($ipv4) {
$ntpdate .= " -4";
$ntpq .= " -4";
}
elsif ($ipv6) {
$ntpdate .= " -6";
$ntpq .= " -6";
}
# else don't use any flags
###
###
### First, check ntpdate
###
###
if (!open (NTPDATE, $ntpdate . " -q $host 2>&1 |")) {
print "Could not open $ntpdate: $!\n";
exit $ERRORS{"UNKNOWN"};
}
my $out;
while (<NTPDATE>) {
#print if ($verbose); # noop
$msg = $_ unless ($msg);
$out .= "$_ ";
if (/stratum\s(\d+)/) {
$stratum = $1;
}
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.
# Has been reported that 0.0000 happens in a production environment
# on Solaris 8 so this check should be taken out - SF tracker 1150777
if (defined $opt_O ) {
if ($offset == 0) { undef $offset;}
}
$ntpdate_error = defined ($offset) ? $ERRORS{"OK"} : $ERRORS{"CRITICAL"};
print "ntperr = $ntpdate_error \n" if $verbose;
}
if (/no server suitable for synchronization found/) {
if ($stratum == 16) {
$ntpdate_error = $ERRORS{"WARNING"};
$msg = "Desynchronized peer server found";
$ignoreret=1;
}
else {
$ntpdate_error = $ERRORS{"CRITICAL"};
$msg = "No suitable peer server found - ";
}
}
}
$out =~ s/\n//g;
close (NTPDATE) ||
die $! ? "$out - Error closing $ntpdate pipe: $!"
: "$out - Exit status: $? from $ntpdate\n";
# declare an error if we also get a non-zero return code from ntpdate
# unless already set to critical
if ( $? && !$ignoreret ) {
print "stderr = $? : $! \n" if $verbose;
$ntpdate_error = $ntpdate_error == $ERRORS{"CRITICAL"} ? $ERRORS{"CRITICAL"} : $ERRORS{"UNKNOWN"} ;
print "ntperr = $ntpdate_error : $!\n" if $verbose;
}
###
###
### Then scan xntpq/ntpq if it exists
### and look in the 11th column for jitter
###
# Field 1: Tally Code ( Space, 'x','.','-','+','#','*','o')
# Only match for '*' which implies sys.peer
# or 'o' which implies pps.peer
# If both exist, the last one is picked.
# Field 2: address of the remote peer
# Field 3: Refid of the clock (0.0.0.0 if unknown, WWWV/PPS/GPS/ACTS/USNO/PCS/... if Stratum1)
# Field 4: stratum (0-15)
# Field 5: Type of the peer: local (l), unicast (u), multicast (m)
# broadcast (b); not sure about multicast/broadcast
# Field 6: last packet receive (in seconds)
# Field 7: polling interval
# Field 8: reachability resgister (octal)
# Field 9: delay
# Field 10: offset
# Field 11: dispersion/jitter
#
# According to bug 773588 Some solaris xntpd implementations seemto match on
# "#" even though the docs say it exceeds maximum distance. Providing patch
# here which will generate a warining.
if ($have_ntpq) {
if ( open(NTPQ, $ntpq . " -np $host 2>&1 |") ) {
while (<NTPQ>) {
print $_ if ($verbose);
if ( /timed out/ ){
$have_ntpq = 0 ;
last ;
}
# number of candidates on <host> for sys.peer
if (/^(\*|\+|\#|o])/) {
++$candidate;
push (@candidates, $_);
print "Candidate count= $candidate\n" if ($verbose);
}
# match sys.peer or pps.peer
if (/^(\*|o)(\S+)\s+(\S+)\s+(\S+)\s+(\S+)\s+(\S+)\s+(\S+)\s+(\S+)\s+(\S+)\s+(\S+)\s+(\S+)/) {
$syspeer = $2;
$stratum = $4;
$jitter = $11;
print "match $_ \n" if $verbose;
if ($jitter > $jcrit) {
print "Jitter_crit = $11 :$jcrit\n" if ($verbose);
$jitter_error = $ERRORS{'CRITICAL'};
} elsif ($jitter > $jwarn ) {
print "Jitter_warn = $11 :$jwarn\n" if ($verbose);
$jitter_error = $ERRORS{'WARNING'};
} else {
$jitter_error = $ERRORS{'OK'};
}
} else {
print "No match!\n" if $verbose;
$jitter = '(not parsed)';
}
}
close NTPQ ||
die $! ? "Error closing $ntpq pipe: $!"
: "Exit status: $? from $ntpq\n";
# if we did not match sys.peer or pps.peer but matched # candidates only
# generate a warning
# based on bug id 773588
unless (defined $syspeer) {
if ($#candidates >=0) {
foreach my $c (@candidates) {
$c =~ /^(#)([-0-9.\s]+)\s+([-0-9A-Za-z_().]+)\s+([-0-9.]+)\s+([lumb-]+)\s+([-0-9m.]+)\s+([-0-9.]+)\s+([-0-9.]+)\s+([-0-9.]+)\s+([-0-9.]+)\s+([-0-9.]+)/;
$syspeer = $2;
$stratum = $4;
$jitter = $11;
print "candidate match $c \n" if $verbose;
if ($jitter > $jcrit) {
print "Candidate match - Jitter_crit = $11 :$jcrit\n" if ($verbose);
$jitter_error = $ERRORS{'CRITICAL'};
}elsif ($jitter > $jwarn ) {
print "Candidate match - Jitter_warn = $11 :$jwarn \n" if ($verbose);
$jitter_error = $ERRORS{'WARNING'};
} else {
$jitter_error = $ERRORS{'WARNING'};
}
}
}
}
}
}
if ($ntpdate_error != $ERRORS{'OK'}) {
$state = $ntpdate_error;
if ($ntpdate_error == $ERRORS{'WARNING'} ) {
$answer = $msg;
}
else {
$answer = $msg . "Server for ntp probably down";
}
if (defined($offset) && abs($offset) > $ocrit) {
$state = $ERRORS{'CRITICAL'};
$answer = "Server Error and offset $offset sec > +/- $ocrit sec";
} elsif (defined($offset) && abs($offset) > $owarn) {
$answer = "Server error and offset $offset sec > +/- $owarn sec";
} elsif (defined($jitter) && abs($jitter) > $jcrit) {
$answer = "Server error and jitter $jitter msec > +/- $jcrit msec";
} elsif (defined($jitter) && abs($jitter) > $jwarn) {
$answer = "Server error and jitter $jitter msec > +/- $jwarn msec";
}
} elsif ($have_ntpq && $jitter_error != $ERRORS{'OK'}) {
$state = $jitter_error;
$answer = "Jitter $jitter too high";
if (defined($offset) && abs($offset) > $ocrit) {
$state = $ERRORS{'CRITICAL'};
$answer = "Jitter error and offset $offset sec > +/- $ocrit sec";
} elsif (defined($offset) && abs($offset) > $owarn) {
$answer = "Jitter error and offset $offset sec > +/- $owarn sec";
} elsif (defined($jitter) && abs($jitter) > $jcrit) {
$answer = "Jitter error and jitter $jitter msec > +/- $jcrit msec";
} elsif (defined($jitter) && abs($jitter) > $jwarn) {
$answer = "Jitter error and jitter $jitter msec > +/- $jwarn msec";
}
} elsif( !$have_ntpq ) { # no errors from ntpdate and no ntpq or ntpq timed out
if (abs($offset) > $ocrit) {
$state = $ERRORS{'CRITICAL'};
$answer = "Offset $offset sec > +/- $ocrit sec";
} elsif (abs($offset) > $owarn) {
$state = $ERRORS{'WARNING'};
$answer = "Offset $offset sec > +/- $owarn sec";
} elsif (( abs($offset) > $owarn) && $def_jitter ) {
$state = $ERRORS{'WARNING'};
$answer = "Offset $offset sec > +/- $owarn sec, ntpq timed out";
} elsif ( $def_jitter ) {
$state = $ERRORS{'WARNING'};
$answer = "Offset $offset secs, ntpq timed out";
} else{
$state = $ERRORS{'OK'};
$answer = "Offset $offset secs";
}
} else { # no errors from ntpdate or ntpq
if (abs($offset) > $ocrit) {
$state = $ERRORS{'CRITICAL'};
$answer = "Offset $offset sec > +/- $ocrit sec, jitter $jitter msec";
} elsif (abs($jitter) > $jcrit ) {
$state = $ERRORS{'CRITICAL'};
$answer = "Jitter $jitter msec> +/- $jcrit msec, offset $offset sec";
} elsif (abs($offset) > $owarn) {
$state = $ERRORS{'WARNING'};
$answer = "Offset $offset sec > +/- $owarn sec, jitter $jitter msec";
} elsif (abs($jitter) > $jwarn ) {
$state = $ERRORS{'WARNING'};
$answer = "Jitter $jitter msec> +/- $jwarn msec, offset $offset sec";
} else {
$state = $ERRORS{'OK'};
$answer = "Offset $offset secs, jitter $jitter msec, peer is stratum $stratum";
}
}
foreach my $key (keys %ERRORS) {
if ($state==$ERRORS{$key}) {
# print ("NTP $key: $answer");
print ("NTP $key: $answer|offset=$offset, jitter=" . $jitter/1000 . ",peer_stratum=$stratum\n");
last;
}
}
exit $state;
####
#### subs
sub print_usage () {
print "Usage: $PROGNAME -H <host> [-46] [-O] [-w <warn>] [-c <crit>] [-j <warn>] [-k <crit>] [-v verbose]\n";
}
sub print_help () {
print_revision($PROGNAME,'@NP_VERSION@');
print "Copyright (c) 2003 Bo Kersey/Karl DeBisschop\n";
print "\n";
print_usage();
print "
Checks the local timestamp offset versus <host> with ntpdate
Checks the jitter/dispersion of clock signal between <host> and its sys.peer with ntpq\n
-O (--zero-offset)
A zero offset on \"ntpdate\" will generate a CRITICAL.\n
-w (--warning)
Clock offset in seconds at which a warning message will be generated.\n Defaults to $DEFAULT_OFFSET_WARN.
-c (--critical)
Clock offset in seconds at which a critical message will be generated.\n Defaults to $DEFAULT_OFFSET_CRIT.
-j (--jwarn)
Clock jitter in milliseconds at which a warning message will be generated.\n Defaults to $DEFAULT_JITTER_WARN.
-k (--jcrit)
Clock jitter in milliseconds at which a critical message will be generated.\n Defaults to $DEFAULT_JITTER_CRIT.
If jitter/dispersion is specified with -j or -k and ntpq times out, then a
warning is returned.\n
-4 (--use-ipv4)
Use IPv4 connection
-6 (--use-ipv6)
Use IPv6 connection
\n";
support();
}
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