plugins-scripts/check_ntp.pl

   1 #!/usr/bin/perl -w
   2 #
   3 # (c)1999 Ian Cass, Knowledge Matters Ltd.
   4 # Read the GNU copyright stuff for all the legalese
   5 #
   6 # Check NTP time servers plugin. This plugin requires the ntpdate utility to
   7 # be installed on the system, however since it's part of the ntp suite, you
   8 # should already have it installed.
   9 #
  10 # $Id$
  11 #
  12 # Nothing clever done in this program - its a very simple bare basics hack to
  13 # get the job done.
  14 #
  15 # Things to do...
  16 # check @words[9] for time differences greater than +/- x secs & return a
  17 # warning.
  18 #
  19 # (c) 1999 Mark Jewiss, Knowledge Matters Limited
  20 # 22-9-1999, 12:45
  21 #
  22 # Modified script to accept 2 parameters or set defaults.
  23 # Now issues warning or critical alert is time difference is greater than the
  24 # time passed.
  25 #
  26 # These changes have not been tested completely due to the unavailability of a
  27 # server with the incorrect time.
  28 #
  29 # (c) 1999 Bo Kersey, VirCIO - Managed Server Solutions <bo@vircio.com>
  30 # 22-10-99, 12:17
  31 #
  32 # Modified the script to give useage if no parameters are input.
  33 #
  34 # Modified the script to check for negative as well as positive
  35 # time differences.
  36 #
  37 # Modified the script to work with ntpdate 3-5.93e Wed Apr 14 20:23:03 EDT 1999
  38 #
  39 # Modified the script to work with ntpdate's that return adjust or offset...
  40 #
  41 #
  42 # Script modified 2000 June 01 by William Pietri <william@bianca.com>
  43 #
  44 # Modified script to handle weird cases:
  45 #     o NTP server doesn't respond (e.g., has died)
  46 #     o Server has correct time but isn't suitable synchronization
  47 #           source. This happens while starting up and if contact
  48 #           with master has been lost.
  49 #
  50 # Modifed to run under Embedded Perl  (sghosh@users.sf.net)
  51 #   - combined logic some blocks together..
  52 #
  53 # Added ntpdate check for stratum 16 desynch peer (James Fidell) Feb 03, 2003
  54 #
  55 # ntpdate - offset is in seconds
  56 # changed ntpdc to ntpq - jitter/dispersion is in milliseconds
  57 #
  58 # Patch for for regex for stratum1 refid.
  59
  60 require 5.004;
  61 use POSIX;
  62 use strict;
  63 use Getopt::Long;
  64 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 $ipv6);
  65 use lib utils.pm;
  66 use utils qw($TIMEOUT %ERRORS &print_revision &support);
  67
  68 $PROGNAME="check_ntp";
  69
  70 sub print_help ();
  71 sub print_usage ();
  72
  73 $ENV{'PATH'}='';
  74 $ENV{'BASH_ENV'}='';
  75 $ENV{'ENV'}='';
  76
  77 # defaults in sec
  78 my $DEFAULT_OFFSET_WARN =  60;  # 1 minute
  79 my $DEFAULT_OFFSET_CRIT = 120;  # 2 minutes
  80 # default in millisec
  81 my $DEFAULT_JITTER_WARN =   5000; # 5 sec
  82 my $DEFAULT_JITTER_CRIT =  10000; # 10 sec
  83
  84 Getopt::Long::Configure('bundling');
  85 GetOptions
  86         ("V"   => \$opt_V, "version"    => \$opt_V,
  87          "h"   => \$opt_h, "help"       => \$opt_h,
  88          "v"   => \$verbose, "verbose"  => \$verbose,
  89          "4"   => \$ipv4, "use-ipv4"    => \$ipv4,
  90          "6"   => \$ipv6, "use-ipv6"    => \$ipv6,
  91          "w=f" => \$opt_w, "warning=f"  => \$opt_w,   # offset|adjust warning if above this number
  92          "c=f" => \$opt_c, "critical=f" => \$opt_c,   # offset|adjust critical if above this number
  93          "O"   => \$opt_O, "zero-offset" => \$opt_O,  # zero-offset  bad
  94          "j=s" => \$opt_j, "jwarn=i"    => \$opt_j,   # jitter warning if above this number
  95          "k=s" => \$opt_k, "jcrit=i"    => \$opt_k,   # jitter critical if above this number
  96          "t=s" => \$opt_t, "timeout=i"  => \$opt_t,
  97          "H=s" => \$opt_H, "hostname=s" => \$opt_H);
  98
  99 if ($opt_V) {
 100         print_revision($PROGNAME,'$Revision$ ');
 101         exit $ERRORS{'OK'};
 102 }
 103
 104 if ($opt_h) {
 105         print_help();
 106         exit $ERRORS{'OK'};
 107 }
 108
 109 # jitter test params specified
 110 if (defined $opt_j || defined $opt_k ) {
 111         $def_jitter = 1;
 112 }
 113
 114 $opt_H = shift unless ($opt_H);
 115 my $host = $1 if ($opt_H && $opt_H =~ m/^([0-9]+\.[0-9]+\.[0-9]+\.[0-9]+|[a-zA-Z][-a-zA-Z0-9]+(\.[a-zA-Z][-a-zA-Z0-9]+)*)$/);
 116 unless ($host) {
 117         print "No target host specified\n";
 118         print_usage();
 119         exit $ERRORS{'UNKNOWN'};
 120 }
 121
 122 my ($timeout, $owarn, $ocrit, $jwarn, $jcrit);
 123
 124 $timeout = $TIMEOUT;
 125 ($opt_t) && ($opt_t =~ /^([0-9]+)$/) && ($timeout = $1);
 126
 127 $owarn = $DEFAULT_OFFSET_WARN;
 128 ($opt_w) && ($opt_w =~ /^([0-9.]+)$/) && ($owarn = $1);
 129
 130 $ocrit = $DEFAULT_OFFSET_CRIT;
 131 ($opt_c) && ($opt_c =~ /^([0-9.]+)$/) && ($ocrit = $1);
 132
 133 $jwarn = $DEFAULT_JITTER_WARN;
 134 ($opt_j) && ($opt_j =~ /^([0-9]+)$/) && ($jwarn = $1);
 135
 136 $jcrit = $DEFAULT_JITTER_CRIT;
 137 ($opt_k) && ($opt_k =~ /^([0-9]+)$/) && ($jcrit = $1);
 138
 139 if ($ocrit < $owarn ) {
 140         print "Critical offset should be larger than warning offset\n";
 141         print_usage();
 142         exit $ERRORS{"UNKNOWN"};
 143 }
 144
 145 if ($def_jitter) {
 146         if ($opt_k < $opt_j) {
 147                 print "Critical jitter should be larger than warning jitter\n";
 148                 print_usage();
 149                 exit $ERRORS{'UNKNOWN'};
 150         }
 151 }
 152
 153
 154 my $stratum = -1;
 155 my $ignoreret = 0;
 156 my $answer = undef;
 157 my $offset = undef;
 158 my $jitter = undef;
 159 my $syspeer = undef;
 160 my $candidate = 0;
 161 my @candidates;
 162 my $msg; # first line of output to print if format is invalid
 163
 164 my $state = $ERRORS{'UNKNOWN'};
 165 my $ntpdate_error = $ERRORS{'UNKNOWN'};
 166 my $jitter_error = $ERRORS{'UNKNOWN'};
 167
 168 # some systems don't have a proper ntpq  (migrated from ntpdc)
 169 my $have_ntpq = undef;
 170 if ($utils::PATH_TO_NTPQ && -x $utils::PATH_TO_NTPQ ) {
 171         $have_ntpq = 1;
 172 }else{
 173         $have_ntpq = 0;
 174 }
 175
 176 # Just in case of problems, let's not hang Nagios
 177 $SIG{'ALRM'} = sub {
 178         print ("ERROR: No response from ntp server (alarm)\n");
 179         exit $ERRORS{"UNKNOWN"};
 180 };
 181 alarm($timeout);
 182
 183 # Determine protocol to be used for ntpdate and ntpq
 184 my $ntpdate = $utils::PATH_TO_NTPDATE;
 185 my $ntpq    = $utils::PATH_TO_NTPQ;
 186 if ($ipv4) {
 187         $ntpdate .= " -4";
 188         $ntpq .= " -4";
 189 }
 190 elsif ($ipv6) {
 191         $ntpdate .= " -6";
 192         $ntpq .= " -6";
 193 }
 194 # else don't use any flags
 195
 196 ###
 197 ###
 198 ### First, check ntpdate
 199 ###
 200 ###
 201
 202 if (!open (NTPDATE, $ntpdate . " -q $host 2>&1 |")) {
 203         print "Could not open $ntpdate: $!\n";
 204         exit $ERRORS{"UNKNOWN"};
 205 }
 206
 207 my $out;
 208 while (<NTPDATE>) {
 209         #print if ($verbose);  # noop
 210         $msg = $_ unless ($msg);
 211         $out .= "$_ ";
 212
 213         if (/stratum\s(\d+)/) {
 214                 $stratum = $1;
 215         }
 216
 217         if (/(offset|adjust)\s+([-.\d]+)/i) {
 218                 $offset = $2;
 219
 220                 # An offset of 0.000000 with an error is probably bogus. Actually,
 221                 # it's probably always bogus, but let's be paranoid here.
 222                 # Has been reported that 0.0000 happens in a production environment
 223                 # on Solaris 8 so this check should be taken out - SF tracker 1150777
 224                 if (defined $opt_O ) {
 225                         if ($offset == 0) { undef $offset;}
 226                 }
 227
 228                 $ntpdate_error = defined ($offset) ? $ERRORS{"OK"} : $ERRORS{"CRITICAL"};
 229                 print "ntperr = $ntpdate_error \n" if $verbose;
 230
 231         }
 232
 233         if (/no server suitable for synchronization found/) {
 234                 if ($stratum == 16) {
 235                         $ntpdate_error = $ERRORS{"WARNING"};
 236                         $msg = "Desynchronized peer server found";
 237                         $ignoreret=1;
 238                 }
 239                 else {
 240                         $ntpdate_error = $ERRORS{"CRITICAL"};
 241                         $msg = "No suitable peer server found - ";
 242                 }
 243         }
 244
 245 }
 246 $out =~ s/\n//g;
 247 close (NTPDATE) ||
 248     die $! ? "$out - Error closing $ntpdate pipe: $!"
 249            : "$out - Exit status: $? from $ntpdate\n";
 250
 251 # declare an error if we also get a non-zero return code from ntpdate
 252 # unless already set to critical
 253 if ( $? && !$ignoreret ) {
 254         print "stderr = $? : $! \n" if $verbose;
 255         $ntpdate_error = $ntpdate_error == $ERRORS{"CRITICAL"} ? $ERRORS{"CRITICAL"} : $ERRORS{"UNKNOWN"}  ;
 256         print "ntperr = $ntpdate_error : $!\n" if $verbose;
 257 }
 258
 259 ###
 260 ###
 261 ### Then scan xntpq/ntpq if it exists
 262 ### and look in the 11th column for jitter
 263 ###
 264 # Field 1: Tally Code ( Space, 'x','.','-','+','#','*','o')
 265 #           Only match for '*' which implies sys.peer
 266 #           or 'o' which implies pps.peer
 267 #           If both exist, the last one is picked.
 268 # Field 2: address of the remote peer
 269 # Field 3: Refid of the clock (0.0.0.0 if unknown, WWWV/PPS/GPS/ACTS/USNO/PCS/... if Stratum1)
 270 # Field 4: stratum (0-15)
 271 # Field 5: Type of the peer: local (l), unicast (u), multicast (m)
 272 #          broadcast (b); not sure about multicast/broadcast
 273 # Field 6: last packet receive (in seconds)
 274 # Field 7: polling interval
 275 # Field 8: reachability resgister (octal)
 276 # Field 9: delay
 277 # Field 10: offset
 278 # Field 11: dispersion/jitter
 279 #
 280 # According to bug 773588 Some solaris xntpd implementations seemto match on
 281 # "#" even though the docs say it exceeds maximum distance. Providing patch
 282 # here which will generate a warining.
 283
 284 if ($have_ntpq) {
 285
 286         if ( open(NTPQ, $ntpq . " -np $host 2>&1 |") ) {
 287                 while (<NTPQ>) {
 288                         print $_ if ($verbose);
 289                         if ( /timed out/ ){
 290                                 $have_ntpq = 0 ;
 291                                 last ;
 292                         }
 293                         # number of candidates on <host> for sys.peer
 294                         if (/^(\*|\+|\#|o])/) {
 295                                 ++$candidate;
 296                                 push (@candidates, $_);
 297                                 print "Candidate count= $candidate\n" if ($verbose);
 298                         }
 299
 300                         # match sys.peer or pps.peer
 301                         if (/^(\*|o)(\S+)\s+(\S+)\s+(\S+)\s+(\S+)\s+(\S+)\s+(\S+)\s+(\S+)\s+(\S+)\s+(\S+)\s+(\S+)/) {
 302                                 $syspeer = $2;
 303                                 $stratum = $4;
 304                                 $jitter = $11;
 305                                 print "match $_ \n" if $verbose;
 306                                 if ($jitter > $jcrit) {
 307                                         print "Jitter_crit = $11 :$jcrit\n" if ($verbose);
 308                                         $jitter_error = $ERRORS{'CRITICAL'};
 309                                 } elsif ($jitter > $jwarn ) {
 310                                         print "Jitter_warn = $11 :$jwarn\n" if ($verbose);
 311                                         $jitter_error = $ERRORS{'WARNING'};
 312                                 } else {
 313                                         $jitter_error = $ERRORS{'OK'};
 314                                 }
 315                         } else {
 316                                 print "No match!\n" if $verbose;
 317                                 $jitter = '(not parsed)';
 318                         }
 319
 320                 }
 321                 close NTPQ ||
 322             die $! ? "Error closing $ntpq pipe: $!"
 323                    : "Exit status: $? from $ntpq\n";
 324
 325                 # if we did not match sys.peer or pps.peer but matched # candidates only
 326                 # generate a warning
 327                 # based on bug id 773588
 328                 unless (defined $syspeer) {
 329                         if ($#candidates >=0) {
 330                                 foreach my $c (@candidates) {
 331                                         $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.]+)/;
 332                                         $syspeer = $2;
 333                                         $stratum = $4;
 334                                         $jitter = $11;
 335                                         print "candidate match $c \n" if $verbose;
 336                                         if ($jitter > $jcrit) {
 337                                                 print "Candidate match - Jitter_crit = $11 :$jcrit\n" if ($verbose);
 338                                                 $jitter_error = $ERRORS{'CRITICAL'};
 339                                         }elsif ($jitter > $jwarn ) {
 340                                                 print "Candidate match - Jitter_warn = $11 :$jwarn \n" if ($verbose);
 341                                                 $jitter_error = $ERRORS{'WARNING'};
 342                                         } else {
 343                                                 $jitter_error = $ERRORS{'WARNING'};
 344                                         }
 345                                 }
 346
 347                         }
 348                 }
 349         }
 350 }
 351
 352
 353 if ($ntpdate_error != $ERRORS{'OK'}) {
 354         $state = $ntpdate_error;
 355         if ($ntpdate_error == $ERRORS{'WARNING'} ) {
 356                 $answer = $msg;
 357         }
 358         else {
 359                 $answer = $msg . "Server for ntp probably down";
 360         }
 361
 362         if (defined($offset) && abs($offset) > $ocrit) {
 363                 $state = $ERRORS{'CRITICAL'};
 364                 $answer = "Server Error and offset $offset sec > +/- $ocrit sec";
 365         } elsif (defined($offset) && abs($offset) > $owarn) {
 366                 $answer = "Server error and offset $offset sec > +/- $owarn sec";
 367         } elsif (defined($jitter) && abs($jitter) > $jcrit) {
 368                 $answer = "Server error and jitter $jitter msec > +/- $jcrit msec";
 369         } elsif (defined($jitter) && abs($jitter) > $jwarn) {
 370                 $answer = "Server error and jitter $jitter msec > +/- $jwarn msec";
 371         }
 372
 373 } elsif ($have_ntpq && $jitter_error != $ERRORS{'OK'}) {
 374         $state = $jitter_error;
 375         $answer = "Jitter $jitter too high";
 376         if (defined($offset) && abs($offset) > $ocrit) {
 377                 $state = $ERRORS{'CRITICAL'};
 378                 $answer = "Jitter error and offset $offset sec > +/- $ocrit sec";
 379         } elsif (defined($offset) && abs($offset) > $owarn) {
 380                 $answer = "Jitter error and offset $offset sec > +/- $owarn sec";
 381         } elsif (defined($jitter) && abs($jitter) > $jcrit) {
 382                 $answer = "Jitter error and jitter $jitter msec > +/- $jcrit msec";
 383         } elsif (defined($jitter) && abs($jitter) > $jwarn) {
 384                 $answer = "Jitter error and jitter $jitter msec > +/- $jwarn msec";
 385         }
 386
 387 } elsif( !$have_ntpq ) { # no errors from ntpdate and no ntpq or ntpq timed out
 388         if (abs($offset) > $ocrit) {
 389                 $state = $ERRORS{'CRITICAL'};
 390                 $answer = "Offset $offset sec > +/- $ocrit sec";
 391         } elsif (abs($offset) > $owarn) {
 392                 $state = $ERRORS{'WARNING'};
 393                 $answer = "Offset $offset sec > +/- $owarn sec";
 394         } elsif (( abs($offset) > $owarn) && $def_jitter ) {
 395                 $state = $ERRORS{'WARNING'};
 396                 $answer = "Offset $offset sec > +/- $owarn sec, ntpq timed out";
 397         } elsif ( $def_jitter ) {
 398                 $state = $ERRORS{'WARNING'};
 399                 $answer = "Offset $offset secs, ntpq timed out";
 400         } else{
 401                 $state = $ERRORS{'OK'};
 402                 $answer = "Offset $offset secs";
 403         }
 404
 405
 406
 407 } else { # no errors from ntpdate or ntpq
 408         if (abs($offset) > $ocrit) {
 409                 $state = $ERRORS{'CRITICAL'};
 410                 $answer = "Offset $offset sec > +/- $ocrit sec, jitter $jitter msec";
 411         } elsif (abs($jitter) > $jcrit ) {
 412                 $state = $ERRORS{'CRITICAL'};
 413                 $answer = "Jitter $jitter msec> +/- $jcrit msec, offset $offset sec";
 414         } elsif (abs($offset) > $owarn) {
 415                 $state = $ERRORS{'WARNING'};
 416                 $answer = "Offset $offset sec > +/- $owarn sec, jitter $jitter msec";
 417         } elsif (abs($jitter) > $jwarn ) {
 418                 $state = $ERRORS{'WARNING'};
 419                 $answer = "Jitter $jitter msec> +/- $jwarn msec, offset $offset sec";
 420
 421         } else {
 422                 $state = $ERRORS{'OK'};
 423                 $answer = "Offset $offset secs, jitter $jitter msec, peer is stratum $stratum";
 424         }
 425
 426 }
 427
 428 foreach my $key (keys %ERRORS) {
 429         if ($state==$ERRORS{$key}) {
 430 #               print ("NTP $key: $answer");
 431                 print ("NTP $key: $answer|offset=$offset, jitter=" . $jitter/1000 .     ",peer_stratum=$stratum\n");
 432                 last;
 433         }
 434 }
 435 exit $state;
 436
 437
 438 ####
 439 #### subs
 440
 441 sub print_usage () {
 442         print "Usage: $PROGNAME -H <host> [-46] [-O] [-w <warn>] [-c <crit>] [-j <warn>] [-k <crit>] [-v verbose]\n";
 443 }
 444
 445 sub print_help () {
 446         print_revision($PROGNAME,'$Revision$');
 447         print "Copyright (c) 2003 Bo Kersey/Karl DeBisschop\n";
 448         print "\n";
 449         print_usage();
 450         print "
 451 Checks the local timestamp offset versus <host> with ntpdate
 452 Checks the jitter/dispersion of clock signal between <host> and its sys.peer with ntpq\n
 453 -O (--zero-offset)
 454      A zero offset on \"ntpdate\" will generate a CRITICAL.\n
 455 -w (--warning)
 456      Clock offset in seconds at which a warning message will be generated.\n    Defaults to $DEFAULT_OFFSET_WARN.
 457 -c (--critical)
 458      Clock offset in seconds at which a critical message will be generated.\n   Defaults to $DEFAULT_OFFSET_CRIT.
 459 -j (--jwarn)
 460      Clock jitter in milliseconds at which a warning message will be generated.\n       Defaults to $DEFAULT_JITTER_WARN.
 461 -k (--jcrit)
 462     Clock jitter in milliseconds at which a critical message will be generated.\n       Defaults to $DEFAULT_JITTER_CRIT.
 463
 464     If jitter/dispersion is specified with -j or -k and ntpq times out, then a
 465     warning is returned.\n
 466 -4 (--use-ipv4)
 467     Use IPv4 connection
 468 -6 (--use-ipv6)
 469     Use IPv6 connection
 470 \n";
 471 support();
 472 }