plugins-scripts/check_ifoperstatus.pl

   1 #!/usr/local/bin/perl -w
   2 #
   3 # check_ifoperstatus.pl - nagios plugin
   4 #
   5 # Copyright (C) 2000 Christoph Kron,
   6 # Modified 5/2002 to conform to updated Nagios Plugin Guidelines
   7 # Added support for named interfaces per Valdimir Ivaschenko (S. Ghosh)
   8 # Added SNMPv3 support (10/2003)
   9 #
  10 # This program is free software; you can redistribute it and/or
  11 # modify it under the terms of the GNU General Public License
  12 # as published by the Free Software Foundation; either version 2
  13 # of the License, or (at your option) any later version.
  14 #
  15 # This program is distributed in the hope that it will be useful,
  16 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  17 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18 # GNU General Public License for more details.
  19 #
  20 # You should have received a copy of the GNU General Public License
  21 # along with this program; if not, write to the Free Software
  22 # Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
  23 #
  24 #
  25 # Report bugs to:  nagiosplug-help@lists.sourceforge.net
  26 #
  27 # 11.01.2000 Version 1.0
  28 # $Id$
  29 #
  30 # Patches from Guy Van Den Bergh to warn on ifadminstatus down interfaces
  31 # instead of critical.
  32 #
  33 # Primary MIB reference - RFC 2863
  34
  35
  36 use POSIX;
  37 use strict;
  38 use lib utils.pm ;
  39 use utils qw($TIMEOUT %ERRORS &print_revision &support);
  40
  41 use Net::SNMP;
  42 use Getopt::Long;
  43 &Getopt::Long::config('bundling');
  44
  45 my $PROGNAME = "check_ifoperstatus";
  46 sub print_help ();
  47 sub usage ();
  48 sub process_arguments ();
  49
  50 my $timeout;
  51 my $status;
  52 my %ifOperStatus =      ('1','up',
  53                          '2','down',
  54                          '3','testing',
  55                          '4','unknown',
  56                          '5','dormant',
  57                          '6','notPresent',
  58                          '7','lowerLayerDown');  # down due to the state of lower layer interface(s)
  59
  60 my $state = "UNKNOWN";
  61 my $answer = "";
  62 my $snmpkey = 0;
  63 my $community = "public";
  64 my $maxmsgsize = 1472 ; # Net::SNMP default is 1472
  65 my ($seclevel, $authproto, $secname, $authpass, $privpass, $auth, $priv, $context);
  66 my $port = 161;
  67 my @snmpoids;
  68 my $sysUptime        = '1.3.6.1.2.1.1.3.0';
  69 my $snmpIfDescr      = '1.3.6.1.2.1.2.2.1.2';
  70 my $snmpIfAdminStatus = '1.3.6.1.2.1.2.2.1.7';
  71 my $snmpIfOperStatus = '1.3.6.1.2.1.2.2.1.8';
  72 my $snmpIfName       = '1.3.6.1.2.1.31.1.1.1.1';
  73 my $snmpIfLastChange = '1.3.6.1.2.1.2.2.1.9';
  74 my $snmpIfAlias      = '1.3.6.1.2.1.31.1.1.1.18';
  75 my $snmpLocIfDescr   = '1.3.6.1.4.1.9.2.2.1.1.28';
  76 my $hostname;
  77 my $ifName;
  78 my $session;
  79 my $error;
  80 my $response;
  81 my $snmp_version = 1 ;
  82 my $ifXTable;
  83 my $opt_h ;
  84 my $opt_V ;
  85 my $ifdescr;
  86 my $key;
  87 my $lastc;
  88 my $dormantWarn;
  89 my $adminWarn;
  90 my $name;
  91
  92 ### Validate Arguments
  93
  94 $status = process_arguments();
  95
  96
  97 # Just in case of problems, let's not hang Nagios
  98 $SIG{'ALRM'} = sub {
  99      print ("ERROR: No snmp response from $hostname (alarm)\n");
 100      exit $ERRORS{"UNKNOWN"};
 101 };
 102
 103 alarm($timeout);
 104
 105
 106 ## map ifdescr to ifindex - should look at being able to cache this value
 107
 108 if (defined $ifdescr) {
 109         # escape "/" in ifdescr - very common in the Cisco world
 110         $ifdescr =~ s/\//\\\//g;
 111
 112         $status=fetch_ifdescr();  # if using on device with large number of interfaces
 113                                                           # recommend use of SNMP v2 (get-bulk)
 114         if ($status==0) {
 115                 $state = "UNKNOWN";
 116                 printf "$state: could not retrive ifdescr snmpkey - $status-$snmpkey\n";
 117                 $session->close;
 118                 exit $ERRORS{$state};
 119         }
 120 }
 121
 122
 123 ## Main function
 124
 125 $snmpIfAdminStatus = $snmpIfAdminStatus . "." . $snmpkey;
 126 $snmpIfOperStatus = $snmpIfOperStatus . "." . $snmpkey;
 127 $snmpIfDescr = $snmpIfDescr . "." . $snmpkey;
 128 $snmpIfName     = $snmpIfName . "." . $snmpkey ;
 129 $snmpIfAlias = $snmpIfAlias . "." . $snmpkey ;
 130
 131 push(@snmpoids,$snmpIfAdminStatus);
 132 push(@snmpoids,$snmpIfOperStatus);
 133 push(@snmpoids,$snmpIfDescr);
 134 push(@snmpoids,$snmpIfName) if (defined $ifXTable) ;
 135 push(@snmpoids,$snmpIfAlias) if (defined $ifXTable) ;
 136
 137    if (!defined($response = $session->get_request(@snmpoids))) {
 138       $answer=$session->error;
 139       $session->close;
 140       $state = 'WARNING';
 141       print ("$state: SNMP error: $answer\n");
 142       exit $ERRORS{$state};
 143    }
 144
 145    $answer = sprintf("host '%s', %s(%s) is %s\n",
 146       $hostname,
 147       $response->{$snmpIfDescr},
 148       $snmpkey,
 149       $ifOperStatus{$response->{$snmpIfOperStatus}}
 150    );
 151
 152
 153    ## Check to see if ifName match is requested and it matches - exit if no match
 154    ## not the interface we want to monitor
 155    if ( defined $name && not ($response->{$snmpIfName} eq $name) ) {
 156       $state = 'UNKNOWN';
 157       $answer = "Interface name ($name) doesn't match snmp value ($response->{$snmpIfName}) (index $snmpkey)";
 158       print ("$state: $answer");
 159       exit $ERRORS{$state};
 160    }
 161
 162    ## define the interface name
 163    if (defined $ifXTable) {
 164      $name = $response->{$snmpIfName} ." - " .$response->{$snmpIfAlias} ;
 165    }else{
 166      $name = $response->{$snmpIfDescr} ;
 167    }
 168
 169    ## if AdminStatus is down - some one made a consious effort to change config
 170    ##
 171    if ( not ($response->{$snmpIfAdminStatus} == 1) ) {
 172      $answer = "Interface $name (index $snmpkey) is administratively down.";
 173      if ( not defined $adminWarn or $adminWarn eq "w" ) {
 174         $state = 'WARNING';
 175      } elsif ( $adminWarn eq "i" ) {
 176         $state = 'OK';
 177      } elsif ( $adminWarn eq "c" ) {
 178         $state = 'CRITICAL';
 179      } else { # If wrong value for -a, say warning
 180         $state = 'WARNING';
 181      }
 182    }
 183    ## Check operational status
 184    elsif ( $response->{$snmpIfOperStatus} == 2 ) {
 185       $state = 'CRITICAL';
 186       $answer = "Interface $name (index $snmpkey) is down.";
 187    } elsif ( $response->{$snmpIfOperStatus} == 5 ) {
 188       if (defined $dormantWarn ) {
 189                                 if ($dormantWarn eq "w") {
 190                           $state = 'WARNING';
 191                                   $answer = "Interface $name (index $snmpkey) is dormant.";
 192                   }elsif($dormantWarn eq "c") {
 193                         $state = 'CRITICAL';
 194                                   $answer = "Interface $name (index $snmpkey) is dormant.";
 195         }elsif($dormantWarn eq "i") {
 196                           $state = 'OK';
 197                                 $answer = "Interface $name (index $snmpkey) is dormant.";
 198         }
 199                         }else{
 200                 # dormant interface  - but warning/critical/ignore not requested
 201                    $state = 'CRITICAL';
 202                    $answer = "Interface $name (index $snmpkey) is dormant.";
 203                         }
 204    } elsif ( $response->{$snmpIfOperStatus} == 6 ) {
 205            $state = 'CRITICAL';
 206            $answer = "Interface $name (index $snmpkey) notPresent - possible hotswap in progress.";
 207    } elsif ( $response->{$snmpIfOperStatus} == 7 ) {
 208            $state = 'CRITICAL';
 209            $answer = "Interface $name (index $snmpkey) down due to lower layer being down.";
 210
 211    } elsif ( $response->{$snmpIfOperStatus} == 3 || $response->{$snmpIfOperStatus} == 4  ) {
 212            $state = 'CRITICAL';
 213            $answer = "Interface $name (index $snmpkey) down (testing/unknown).";
 214
 215    } else {
 216       $state = 'OK';
 217       $answer = "Interface $name (index $snmpkey) is up.";
 218    }
 219
 220
 221
 222 print ("$state: $answer");
 223 exit $ERRORS{$state};
 224
 225
 226 ### subroutines
 227
 228 sub fetch_ifdescr {
 229         if (!defined ($response = $session->get_table($snmpIfDescr))) {
 230                 $answer=$session->error;
 231                 $session->close;
 232                 $state = 'CRITICAL';
 233                 printf ("$state: SNMP error with snmp version $snmp_version ($answer)\n");
 234                 $session->close;
 235                 exit $ERRORS{$state};
 236         }
 237
 238         foreach $key ( keys %{$response}) {
 239                 if ($response->{$key} =~ /^$ifdescr$/) {
 240                         $key =~ /.*\.(\d+)$/;
 241                         $snmpkey = $1;
 242                         #print "$ifdescr = $key / $snmpkey \n";  #debug
 243                 }
 244         }
 245         unless (defined $snmpkey) {
 246                 $session->close;
 247                 $state = 'CRITICAL';
 248                 printf "$state: Could not match $ifdescr on $hostname\n";
 249                 exit $ERRORS{$state};
 250         }
 251
 252         return $snmpkey;
 253 }
 254
 255 sub usage() {
 256   printf "\nMissing arguments!\n";
 257   printf "\n";
 258   printf "usage: \n";
 259   printf "check_ifoperstatus -k <IF_KEY> -H <HOSTNAME> [-C <community>]\n";
 260   printf "Copyright (C) 2000 Christoph Kron\n";
 261   printf "check_ifoperstatus.pl comes with ABSOLUTELY NO WARRANTY\n";
 262   printf "This programm is licensed under the terms of the ";
 263   printf "GNU General Public License\n(check source code for details)\n";
 264   printf "\n\n";
 265   exit $ERRORS{"UNKNOWN"};
 266 }
 267
 268 sub print_help() {
 269         printf "check_ifoperstatus plugin for Nagios monitors operational \n";
 270         printf "status of a particular network interface on the target host\n";
 271         printf "\nUsage:\n";
 272         printf "   -H (--hostname)   Hostname to query - (required)\n";
 273         printf "   -C (--community)  SNMP read community (defaults to public,\n";
 274         printf "                     used with SNMP v1 and v2c\n";
 275         printf "   -v (--snmp_version)  1 for SNMP v1 (default)\n";
 276         printf "                        2 for SNMP v2c\n";
 277         printf "                        SNMP v2c will use get_bulk for less overhead\n";
 278         printf "                        if monitoring with -d\n";
 279         printf "   -L (--seclevel)   choice of \"noAuthNoPriv\", \"authNoPriv\", or     \"authPriv\"\n";
 280         printf "   -U (--secname)    username for SNMPv3 context\n";
 281         printf "   -c (--context)    SNMPv3 context name (default is empty      string)";
 282         printf "   -A (--authpass)   authentication password (cleartext ascii or localized key\n";
 283         printf "                     in hex with 0x prefix generated by using   \"snmpkey\" utility\n";
 284         printf "                     auth password and authEngineID\n";
 285         printf "   -a (--authproto)  Authentication protocol ( MD5 or SHA1)\n";
 286         printf "   -X (--privpass)   privacy password (cleartext ascii or localized key\n";
 287         printf "                     in hex with 0x prefix generated by using   \"snmpkey\" utility\n";
 288         printf "                     privacy password and authEngineID\n";
 289         printf "   -k (--key)        SNMP IfIndex value\n";
 290         printf "   -d (--descr)      SNMP ifDescr value\n";
 291         printf "   -p (--port)       SNMP port (default 161)\n";
 292         printf "   -I (--ifmib)      Agent supports IFMIB ifXTable.  Do not use if\n";
 293         printf "                     you don't know what this is. \n";
 294         printf "   -n (--name)       the value should match the returned ifName\n";
 295         printf "                     (Implies the use of -I)\n";
 296         printf "   -w (--warn =i|w|c) ignore|warn|crit if the interface is dormant (default critical)\n";
 297         printf "   -D (--admin-down =i|w|c) same for administratively down interfaces (default warning)\n";
 298         printf "   -M (--maxmsgsize) Max message size - usefull only for v1 or v2c\n";
 299         printf "   -t (--timeout)    seconds before the plugin times out (default=$TIMEOUT)\n";
 300         printf "   -V (--version)    Plugin version\n";
 301         printf "   -h (--help)       usage help \n\n";
 302         printf " -k or -d must be specified\n\n";
 303         printf "Note: either -k or -d must be specified and -d is much more network \n";
 304         printf "intensive.  Use it sparingly or not at all.  -n is used to match against\n";
 305         printf "a much more descriptive ifName value in the IfXTable to verify that the\n";
 306         printf "snmpkey has not changed to some other network interface after a reboot.\n\n";
 307         print_revision($PROGNAME, '$Revision$');
 308
 309 }
 310
 311 sub process_arguments() {
 312         $status = GetOptions(
 313                         "V"   => \$opt_V, "version"    => \$opt_V,
 314                         "h"   => \$opt_h, "help"       => \$opt_h,
 315                         "v=i" => \$snmp_version, "snmp_version=i"  => \$snmp_version,
 316                         "C=s" => \$community, "community=s" => \$community,
 317                         "L=s" => \$seclevel, "seclevel=s" => \$seclevel,
 318                         "a=s" => \$authproto, "authproto=s" => \$authproto,
 319                         "U=s" => \$secname,   "secname=s"   => \$secname,
 320                         "A=s" => \$authpass,  "authpass=s"  => \$authpass,
 321                         "X=s" => \$privpass,  "privpass=s"  => \$privpass,
 322                         "c=s" => \$context,   "context=s"   => \$context,
 323                         "k=i" => \$snmpkey, "key=i",\$snmpkey,
 324                         "d=s" => \$ifdescr, "descr=s" => \$ifdescr,
 325                         "l=s" => \$lastc,  "lastchange=s" => \$lastc,
 326                         "p=i" => \$port,  "port=i" =>\$port,
 327                         "H=s" => \$hostname, "hostname=s" => \$hostname,
 328                         "I"   => \$ifXTable, "ifmib" => \$ifXTable,
 329                         "n=s" => \$ifName, "name=s" => \$ifName,
 330                         "w=s" => \$dormantWarn, "warn=s" => \$dormantWarn,
 331                         "D=s" => \$adminWarn, "admin-down=s" => \$adminWarn,
 332                         "M=i" => \$maxmsgsize, "maxmsgsize=i" => \$maxmsgsize,
 333                         "t=i" => \$timeout,    "timeout=i" => \$timeout,
 334                         );
 335
 336
 337
 338         if ($status == 0){
 339                 print_help();
 340                 exit $ERRORS{'OK'};
 341         }
 342
 343         if ($opt_V) {
 344                 print_revision($PROGNAME,'$Revision$ ');
 345                 exit $ERRORS{'OK'};
 346         }
 347
 348         if ($opt_h) {
 349                 print_help();
 350                 exit $ERRORS{'OK'};
 351         }
 352
 353         if (! utils::is_hostname($hostname)){
 354                 usage();
 355                 exit $ERRORS{"UNKNOWN"};
 356         }
 357
 358
 359         unless ($snmpkey > 0 || defined $ifdescr){
 360                 printf "Either a valid snmpkey key (-k) or a ifDescr (-d) must be provided)\n";
 361                 usage();
 362                 exit $ERRORS{"UNKNOWN"};
 363         }
 364
 365
 366         if (defined $name) {
 367                 $ifXTable=1;
 368         }
 369
 370         if (defined $dormantWarn) {
 371                 unless ($dormantWarn =~ /^(w|c|i)$/ ) {
 372                         printf "Dormant alerts must be one of w|c|i \n";
 373                         exit $ERRORS{'UNKNOWN'};
 374                 }
 375         }
 376
 377         unless (defined $timeout) {
 378                 $timeout = $TIMEOUT;
 379         }
 380
 381         if ($snmp_version =~ /3/ ) {
 382                 # Must define a security level even though default is noAuthNoPriv
 383                 # v3 requires a security username
 384                 if (defined $seclevel  && defined $secname) {
 385
 386                         # Must define a security level even though defualt is noAuthNoPriv
 387                         unless ( grep /^$seclevel$/, qw(noAuthNoPriv authNoPriv authPriv) ) {
 388                                 usage();
 389                                 exit $ERRORS{"UNKNOWN"};
 390                         }
 391
 392                         # Authentication wanted
 393                         if ( $seclevel eq 'authNoPriv' || $seclevel eq 'authPriv' ) {
 394
 395                                 unless ( $authproto eq 'MD5' || $authproto eq 'SHA1' ) {
 396                                         usage();
 397                                         exit $ERRORS{"UNKNOWN"};
 398                                 }
 399
 400                                 if ( !defined $authpass) {
 401                                         usage();
 402                                         exit $ERRORS{"UNKNOWN"};
 403                                 }else{
 404                                         if ($authpass =~ /^0x/ ) {
 405                                                 $auth = "-authkey => $authpass" ;
 406                                         }else{
 407                                                 $auth = "-authpassword => $authpass";
 408                                         }
 409                                 }
 410
 411                         }
 412
 413                         # Privacy (DES encryption) wanted
 414                         if ($seclevel eq  'authPriv' ) {
 415                                 if (! defined $privpass) {
 416                                         usage();
 417                                         exit $ERRORS{"UNKNOWN"};
 418                                 }else{
 419                                         if ($privpass =~ /^0x/){
 420                                                 $priv = "-privkey => $privpass";
 421                                         }else{
 422                                                 $priv = "-privpassword => $privpass";
 423                                         }
 424                                 }
 425                         }
 426
 427                         # Context name defined or default
 428
 429                         unless ( defined $context) {
 430                                 $context = "";
 431                         }
 432
 433
 434
 435                 }else {
 436                                         usage();
 437                                         exit $ERRORS{'UNKNOWN'}; ;
 438                 }
 439         } # end snmpv3
 440
 441
 442         if ( $snmp_version =~ /[12]/ ) {
 443         ($session, $error) = Net::SNMP->session(
 444                         -hostname  => $hostname,
 445                         -community => $community,
 446                         -port      => $port,
 447                         -version        => $snmp_version,
 448                         -maxmsgsize => $maxmsgsize
 449                 );
 450
 451                 if (!defined($session)) {
 452                         $state='UNKNOWN';
 453                         $answer=$error;
 454                         print ("$state: $answer");
 455                         exit $ERRORS{$state};
 456                 }
 457
 458         }elsif ( $snmp_version =~ /3/ ) {
 459
 460                 if ($seclevel eq 'noAuthNoPriv') {
 461                         ($session, $error) = Net::SNMP->session(
 462                                 -hostname  => $hostname,
 463                                 -port      => $port,
 464                                 -version  => $snmp_version,
 465                                 -username => $secname,
 466                         );
 467
 468                 }elsif ( $seclevel eq 'authNoPriv' ) {
 469                         ($session, $error) = Net::SNMP->session(
 470                                 -hostname  => $hostname,
 471                                 -port      => $port,
 472                                 -version  => $snmp_version,
 473                                 -username => $secname,
 474                                 $auth,
 475                                 -authprotocol => $authproto,
 476                         );
 477                 }elsif ($seclevel eq 'authPriv' ) {
 478                         ($session, $error) = Net::SNMP->session(
 479                                 -hostname  => $hostname,
 480                                 -port      => $port,
 481                                 -version  => $snmp_version,
 482                                 -username => $secname,
 483                                 $auth,
 484                                 -authprotocol => $authproto,
 485                                 $priv
 486                         );
 487                 }
 488
 489
 490                 if (!defined($session)) {
 491                                         $state='UNKNOWN';
 492                                         $answer=$error;
 493                                         print ("$state: $answer");
 494                                         exit $ERRORS{$state};
 495                 }
 496
 497         }else{
 498                 $state='UNKNOWN';
 499                 print ("$state: No support for SNMP v$snmp_version yet\n");
 500                 exit $ERRORS{$state};
 501         }
 502
 503 }
 504 ## End validation
 505