#! /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,v 1.20 2004/11/19 03:59:43 mattkent Exp $ # # 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 # 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 # # 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_j $opt_k $verbose $PROGNAME $def_jitter); use lib "/usr/lib/nagios/plugins"; use utils qw($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 $DEFAULT_JITTER_CRIT = 10000; # 10 sec Getopt::Long::Configure('bundling'); GetOptions ("V" => \$opt_V, "version" => \$opt_V, "h" => \$opt_h, "help" => \$opt_h, "v" => \$verbose, "verbose" => \$verbose, "w=f" => \$opt_w, "warning=f" => \$opt_w, # offset|adjust warning if above this number "c=f" => \$opt_c, "critical=f" => \$opt_c, # offset|adjust critical if above this number "j=s" => \$opt_j, "jwarn=i" => \$opt_j, # jitter warning if above this number "k=s" => \$opt_k, "jcrit=i" => \$opt_k, # jitter critical if above this number "t=s" => \$opt_t, "timeout=i" => \$opt_t, "H=s" => \$opt_H, "hostname=s" => \$opt_H); if ($opt_V) { print_revision($PROGNAME,'$Revision: 1.20 $ '); 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 Nagios $SIG{'ALRM'} = sub { print ("ERROR: No response from ntp server (alarm)\n"); exit $ERRORS{"UNKNOWN"}; }; alarm($timeout); ### ### ### First, check ntpdate ### ### if (!open (NTPDATE, "$utils::PATH_TO_NTPDATE -q $host 2>&1 |")) { print "Could not open ntpdate\n"; exit $ERRORS{"UNKNOWN"}; } while () { print if ($verbose); $msg = $_ unless ($msg); if (/stratum\s(\d+)/) { $stratum = $1; } if (/(offset|adjust)\s+([-.\d]+)/i) { $offset = $2; # An offset of 0.000000 with an error is probably bogus. Actually, # it's probably always bogus, but let's be paranoid here. if ($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 - "; } } } close (NTPDATE); # 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,"$utils::PATH_TO_NTPQ -np $host 2>&1 |") ) { while () { print $_ if ($verbose); if ( /timed out/ ){ $have_ntpq = 0 ; last ; } # number of candidates on for sys.peer if (/^(\*|\+|\#|o])/) { ++$candidate; push (@candidates, $_); print "Candiate count= $candidate\n" if ($verbose); } # match sys.peer or pps.peer if (/^(\*|o)([-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 "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'}; } } } close NTPQ; # 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 . "\n"; } else { $answer = $msg . "Server for ntp probably down\n"; } if (defined($offset) && abs($offset) > $ocrit) { $state = $ERRORS{'CRITICAL'}; $answer = "Server Error and offset $offset sec > +/- $ocrit sec\n"; } elsif (defined($offset) && abs($offset) > $owarn) { $answer = "Server error and offset $offset sec > +/- $owarn sec\n"; } elsif (defined($jitter) && abs($jitter) > $jcrit) { $answer = "Server error and jitter $jitter msec > +/- $jcrit msec\n"; } elsif (defined($jitter) && abs($jitter) > $jwarn) { $answer = "Server error and jitter $jitter msec > +/- $jwarn msec\n"; } } elsif ($have_ntpq && $jitter_error != $ERRORS{'OK'}) { $state = $jitter_error; $answer = "Jitter $jitter too high\n"; if (defined($offset) && abs($offset) > $ocrit) { $state = $ERRORS{'CRITICAL'}; $answer = "Jitter error and offset $offset sec > +/- $ocrit sec\n"; } elsif (defined($offset) && abs($offset) > $owarn) { $answer = "Jitter error and offset $offset sec > +/- $owarn sec\n"; } elsif (defined($jitter) && abs($jitter) > $jcrit) { $answer = "Jitter error and jitter $jitter msec > +/- $jcrit msec\n"; } elsif (defined($jitter) && abs($jitter) > $jwarn) { $answer = "Jitter error and jitter $jitter msec > +/- $jwarn msec\n"; } } elsif( !$have_ntpq ) { # no errors from ntpdate and no ntpq or ntpq timed out if (abs($offset) > $ocrit) { $state = $ERRORS{'CRITICAL'}; $answer = "Offset $offset sec > +/- $ocrit sec\n"; } elsif (abs($offset) > $owarn) { $state = $ERRORS{'WARNING'}; $answer = "Offset $offset sec > +/- $owarn sec\n"; } elsif (( abs($offset) > $owarn) && $def_jitter ) { $state = $ERRORS{'WARNING'}; $answer = "Offset $offset sec > +/- $owarn sec, ntpq timed out\n"; } elsif ( $def_jitter ) { $state = $ERRORS{'WARNING'}; $answer = "Offset $offset secs, ntpq timed out\n"; } else{ $state = $ERRORS{'OK'}; $answer = "Offset $offset secs \n"; } } else { # no errors from ntpdate or ntpq if (abs($offset) > $ocrit) { $state = $ERRORS{'CRITICAL'}; $answer = "Offset $offset sec > +/- $ocrit sec, jitter $jitter msec\n"; } elsif (abs($jitter) > $jcrit ) { $state = $ERRORS{'CRITICAL'}; $answer = "Jitter $jitter msec> +/- $jcrit msec, offset $offset sec \n"; } elsif (abs($offset) > $owarn) { $state = $ERRORS{'WARNING'}; $answer = "Offset $offset sec > +/- $owarn sec, jitter $jitter msec\n"; } elsif (abs($jitter) > $jwarn ) { $state = $ERRORS{'WARNING'}; $answer = "Jitter $jitter msec> +/- $jwarn msec, offset $offset sec \n"; } else { $state = $ERRORS{'OK'}; $answer = "Offset $offset secs, jitter $jitter msec, peer is stratum $stratum\n"; } } foreach my $key (keys %ERRORS) { if ($state==$ERRORS{$key}) { print ("NTP $key: $answer"); last; } } exit $state; #### #### subs sub print_usage () { print "Usage: $PROGNAME -H [-w ] [-c ] [-j ] [-k ] [-v verbose]\n"; } sub print_help () { print_revision($PROGNAME,'$Revision: 1.20 $'); print "Copyright (c) 2003 Bo Kersey/Karl DeBisschop\n"; print "\n"; print_usage(); print " Checks the local timestamp offset versus with ntpdate Checks the jitter/dispersion of clock signal between and its sys.peer with ntpq\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 warning message will be generated.\n Defaults to $DEFAULT_JITTER_CRIT.\n If jitter/dispersion is specified with -j or -k and ntpq times out, then a warning is returned. "; support(); }