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 #
  29 # Patches from Guy Van Den Bergh to warn on ifadminstatus down interfaces
  30 # instead of critical.
  31 #
  32 # Primary MIB reference - RFC 2863
  33
  34
  35 use POSIX;
  36 use strict;
  37 use lib utils.pm ;
  38 use utils qw($TIMEOUT %ERRORS &print_revision &support);
  39
  40 use Net::SNMP;
  41 use Getopt::Long;
  42 &Getopt::Long::config('bundling');
  43
  44 my $PROGNAME = "check_ifoperstatus";
  45 sub print_help ();
  46 sub usage ($);
  47 sub print_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, $privproto, $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 $snmpIfType       = '1.3.6.1.2.1.2.2.1.3';
  71 my $snmpIfAdminStatus = '1.3.6.1.2.1.2.2.1.7';
  72 my $snmpIfOperStatus = '1.3.6.1.2.1.2.2.1.8';
  73 my $snmpIfName       = '1.3.6.1.2.1.31.1.1.1.1';
  74 my $snmpIfLastChange = '1.3.6.1.2.1.2.2.1.9';
  75 my $snmpIfAlias      = '1.3.6.1.2.1.31.1.1.1.18';
  76 my $snmpLocIfDescr   = '1.3.6.1.4.1.9.2.2.1.1.28';
  77 my $hostname;
  78 my $ifName;
  79 my $session;
  80 my $error;
  81 my $response;
  82 my $snmp_version = 1 ;
  83 my $ifXTable;
  84 my $opt_h ;
  85 my $opt_V ;
  86 my $ifdescr;
  87 my $iftype;
  88 my $key;
  89 my $lastc;
  90 my $dormantWarn;
  91 my $adminWarn;
  92 my $name;
  93 my %session_opts;
  94
  95 ### Validate Arguments
  96
  97 $status = process_arguments();
  98
  99
 100 # Just in case of problems, let's not hang Nagios
 101 $SIG{'ALRM'} = sub {
 102         print ("ERROR: No snmp response from $hostname (alarm)\n");
 103         exit $ERRORS{"UNKNOWN"};
 104 };
 105
 106 alarm($timeout);
 107
 108 ($session, $error) = Net::SNMP->session(%session_opts);
 109
 110
 111 if (!defined($session)) {
 112                         $state='UNKNOWN';
 113                         $answer=$error;
 114                         print ("$state: $answer\n");
 115                         exit $ERRORS{$state};
 116 }
 117
 118 ## map ifdescr to ifindex - should look at being able to cache this value
 119
 120 if (defined $ifdescr || defined $iftype) {
 121         # escape "/" in ifdescr - very common in the Cisco world
 122         if (defined $iftype) {
 123                 $status=fetch_ifindex($snmpIfType, $iftype);
 124         } else {
 125                 $ifdescr =~ s/\//\\\//g;
 126                 $status=fetch_ifindex($snmpIfDescr, $ifdescr);  # if using on device with large number of interfaces
 127                                                                 # recommend use of SNMP v2 (get-bulk)
 128         }
 129         if ($status==0) {
 130                 $state = "UNKNOWN";
 131                 printf "$state: could not retrive ifdescr/iftype snmpkey - $status-$snmpkey\n";
 132                 $session->close;
 133                 exit $ERRORS{$state};
 134         }
 135 }
 136
 137
 138 ## Main function
 139
 140 $snmpIfAdminStatus = $snmpIfAdminStatus . "." . $snmpkey;
 141 $snmpIfOperStatus = $snmpIfOperStatus . "." . $snmpkey;
 142 $snmpIfDescr = $snmpIfDescr . "." . $snmpkey;
 143 $snmpIfName     = $snmpIfName . "." . $snmpkey ;
 144 $snmpIfAlias = $snmpIfAlias . "." . $snmpkey ;
 145
 146 push(@snmpoids,$snmpIfAdminStatus);
 147 push(@snmpoids,$snmpIfOperStatus);
 148 push(@snmpoids,$snmpIfDescr);
 149 push(@snmpoids,$snmpIfName) if (defined $ifXTable) ;
 150 push(@snmpoids,$snmpIfAlias) if (defined $ifXTable) ;
 151
 152 if (!defined($response = $session->get_request(@snmpoids))) {
 153         $answer=$session->error;
 154         $session->close;
 155         $state = 'WARNING';
 156         print ("$state: SNMP error: $answer\n");
 157         exit $ERRORS{$state};
 158 }
 159
 160 $answer = sprintf("host '%s', %s(%s) is %s\n",
 161         $hostname,
 162         $response->{$snmpIfDescr},
 163         $snmpkey,
 164         $ifOperStatus{$response->{$snmpIfOperStatus}}
 165 );
 166
 167
 168 ## Check to see if ifName match is requested and it matches - exit if no match
 169 ## not the interface we want to monitor
 170 if ( defined $ifName && not ($response->{$snmpIfName} eq $ifName) ) {
 171         $state = 'UNKNOWN';
 172         $answer = "Interface name ($ifName) doesn't match snmp value ($response->{$snmpIfName}) (index $snmpkey)";
 173         print ("$state: $answer\n");
 174         exit $ERRORS{$state};
 175 }
 176
 177 ## define the interface name
 178 if (defined $ifXTable) {
 179          $name = $response->{$snmpIfName} ." - " .$response->{$snmpIfAlias} ;
 180 }else{
 181          $name = $response->{$snmpIfDescr} ;
 182 }
 183
 184 ## if AdminStatus is down - some one made a consious effort to change config
 185 ##
 186 if ( not ($response->{$snmpIfAdminStatus} == 1) ) {
 187         $answer = "Interface $name (index $snmpkey) is administratively down.";
 188         if ( not defined $adminWarn or $adminWarn eq "w" ) {
 189                 $state = 'WARNING';
 190         } elsif ( $adminWarn eq "i" ) {
 191                 $state = 'OK';
 192         } elsif ( $adminWarn eq "c" ) {
 193                 $state = 'CRITICAL';
 194         } else { # If wrong value for -a, say warning
 195                 $state = 'WARNING';
 196         }
 197 }
 198 ## Check operational status
 199 elsif ( $response->{$snmpIfOperStatus} == 2 ) {
 200         $state = 'CRITICAL';
 201         $answer = "Interface $name (index $snmpkey) is down.";
 202 } elsif ( $response->{$snmpIfOperStatus} == 5 ) {
 203         if (defined $dormantWarn ) {
 204                 if ($dormantWarn eq "w") {
 205                         $state = 'WARNING';
 206                         $answer = "Interface $name (index $snmpkey) is dormant.";
 207                 }elsif($dormantWarn eq "c") {
 208                         $state = 'CRITICAL';
 209                         $answer = "Interface $name (index $snmpkey) is dormant.";
 210                 }elsif($dormantWarn eq "i") {
 211                         $state = 'OK';
 212                         $answer = "Interface $name (index $snmpkey) is dormant.";
 213                 }
 214         }else{
 215                 # dormant interface - but warning/critical/ignore not requested
 216                 $state = 'CRITICAL';
 217                 $answer = "Interface $name (index $snmpkey) is dormant.";
 218         }
 219 } elsif ( $response->{$snmpIfOperStatus} == 6 ) {
 220         $state = 'CRITICAL';
 221         $answer = "Interface $name (index $snmpkey) notPresent - possible hotswap in progress.";
 222 } elsif ( $response->{$snmpIfOperStatus} == 7 ) {
 223         $state = 'CRITICAL';
 224         $answer = "Interface $name (index $snmpkey) down due to lower layer being down.";
 225 } elsif ( $response->{$snmpIfOperStatus} == 3 || $response->{$snmpIfOperStatus} == 4  ) {
 226         $state = 'CRITICAL';
 227         $answer = "Interface $name (index $snmpkey) down (testing/unknown).";
 228 } else {
 229         $state = 'OK';
 230         $answer = "Interface $name (index $snmpkey) is up.";
 231 }
 232
 233
 234
 235 print ("$state: $answer\n");
 236 exit $ERRORS{$state};
 237
 238
 239 ### subroutines
 240
 241 sub fetch_ifindex {
 242         my $oid = shift;
 243         my $lookup = shift;
 244
 245         if (!defined ($response = $session->get_table($oid))) {
 246                 $answer=$session->error;
 247                 $session->close;
 248                 $state = 'CRITICAL';
 249                 printf ("$state: SNMP error with snmp version $snmp_version ($answer)\n");
 250                 $session->close;
 251                 exit $ERRORS{$state};
 252         }
 253
 254         foreach $key ( keys %{$response}) {
 255                 if ($response->{$key} =~ /^$lookup$/) {
 256                         $key =~ /.*\.(\d+)$/;
 257                         $snmpkey = $1;
 258                         #print "$lookup = $key / $snmpkey \n";  #debug
 259                 }
 260         }
 261         unless (defined $snmpkey) {
 262                 $session->close;
 263                 $state = 'CRITICAL';
 264                 printf "$state: Could not match $ifdescr on $hostname\n";
 265                 exit $ERRORS{$state};
 266         }
 267
 268         return $snmpkey;
 269 }
 270
 271 sub usage($) {
 272         print "$_[0]\n";
 273         print_usage();
 274         exit $ERRORS{"UNKNOWN"};
 275 }
 276
 277 sub print_usage() {
 278         printf "\n";
 279         printf "usage: \n";
 280         printf "check_ifoperstatus -k <IF_KEY> -H <HOSTNAME> [-C <community>]\n";
 281         printf "Copyright (C) 2000 Christoph Kron\n";
 282         printf "check_ifoperstatus.pl comes with ABSOLUTELY NO WARRANTY\n";
 283         printf "This programm is licensed under the terms of the ";
 284         printf "GNU General Public License\n(check source code for details)\n";
 285         printf "\n\n";
 286 }
 287
 288 sub print_help() {
 289         print_revision($PROGNAME, '@NP_VERSION@');
 290         print_usage();
 291         printf "check_ifoperstatus plugin for Nagios monitors operational \n";
 292         printf "status of a particular network interface on the target host\n";
 293         printf "\nUsage:\n";
 294         printf "   -H (--hostname)   Hostname to query - (required)\n";
 295         printf "   -C (--community)  SNMP read community (defaults to public,\n";
 296         printf "                     used with SNMP v1 and v2c\n";
 297         printf "   -v (--snmp_version)  1 for SNMP v1 (default)\n";
 298         printf "                        2 for SNMP v2c\n";
 299         printf "                        SNMP v2c will use get_bulk for less overhead\n";
 300         printf "                        if monitoring with -d\n";
 301         printf "   -L (--seclevel)   choice of \"noAuthNoPriv\", \"authNoPriv\", or     \"authPriv\"\n";
 302         printf "   -U (--secname)    username for SNMPv3 context\n";
 303         printf "   -c (--context)    SNMPv3 context name (default is empty string)\n";
 304         printf "   -A (--authpass)   authentication password (cleartext ascii or localized key\n";
 305         printf "                     in hex with 0x prefix generated by using \"snmpkey\" utility\n";
 306         printf "                     auth password and authEngineID\n";
 307         printf "   -a (--authproto)  Authentication protocol (MD5 or SHA1)\n";
 308         printf "   -X (--privpass)   privacy password (cleartext ascii or localized key\n";
 309         printf "                     in hex with 0x prefix generated by using \"snmpkey\" utility\n";
 310         printf "                     privacy password and authEngineID\n";
 311         printf "   -P (--privproto)  privacy protocol (DES or AES; default: DES)\n";
 312         printf "   -k (--key)        SNMP IfIndex value\n";
 313         printf "   -d (--descr)      SNMP ifDescr value\n";
 314         printf "   -T (--type)       SNMP ifType integer value (see http://www.iana.org/assignments/ianaiftype-mib)\n";
 315         printf "   -p (--port)       SNMP port (default 161)\n";
 316         printf "   -I (--ifmib)      Agent supports IFMIB ifXTable. Do not use if\n";
 317         printf "                     you don't know what this is. \n";
 318         printf "   -n (--name)       the value should match the returned ifName\n";
 319         printf "                     (Implies the use of -I)\n";
 320         printf "   -w (--warn =i|w|c) ignore|warn|crit if the interface is dormant (default critical)\n";
 321         printf "   -D (--admin-down =i|w|c) same for administratively down interfaces (default warning)\n";
 322         printf "   -M (--maxmsgsize) Max message size - usefull only for v1 or v2c\n";
 323         printf "   -t (--timeout)    seconds before the plugin times out (default=$TIMEOUT)\n";
 324         printf "   -V (--version)    Plugin version\n";
 325         printf "   -h (--help)       usage help \n\n";
 326         printf " -k or -d or -T must be specified\n\n";
 327         printf "Note: either -k or -d or -T must be specified and -d and -T are much more network \n";
 328         printf "intensive.  Use it sparingly or not at all.  -n is used to match against\n";
 329         printf "a much more descriptive ifName value in the IfXTable to verify that the\n";
 330         printf "snmpkey has not changed to some other network interface after a reboot.\n\n";
 331
 332 }
 333
 334 sub process_arguments() {
 335         $status = GetOptions(
 336                         "V"   => \$opt_V, "version"    => \$opt_V,
 337                         "h"   => \$opt_h, "help"       => \$opt_h,
 338                         "v=i" => \$snmp_version, "snmp_version=i"  => \$snmp_version,
 339                         "C=s" => \$community, "community=s" => \$community,
 340                         "L=s" => \$seclevel, "seclevel=s" => \$seclevel,
 341                         "a=s" => \$authproto, "authproto=s" => \$authproto,
 342                         "U=s" => \$secname,   "secname=s"   => \$secname,
 343                         "A=s" => \$authpass,  "authpass=s"  => \$authpass,
 344                         "X=s" => \$privpass,  "privpass=s"  => \$privpass,
 345                         "P=s" => \$privproto,  "privproto=s"  => \$privproto,
 346                         "c=s" => \$context,   "context=s"   => \$context,
 347                         "k=i" => \$snmpkey, "key=i",\$snmpkey,
 348                         "d=s" => \$ifdescr, "descr=s" => \$ifdescr,
 349                         "l=s" => \$lastc,  "lastchange=s" => \$lastc,
 350                         "p=i" => \$port,  "port=i" =>\$port,
 351                         "H=s" => \$hostname, "hostname=s" => \$hostname,
 352                         "I"   => \$ifXTable, "ifmib" => \$ifXTable,
 353                         "n=s" => \$ifName, "name=s" => \$ifName,
 354                         "w=s" => \$dormantWarn, "warn=s" => \$dormantWarn,
 355                         "D=s" => \$adminWarn, "admin-down=s" => \$adminWarn,
 356                         "M=i" => \$maxmsgsize, "maxmsgsize=i" => \$maxmsgsize,
 357                         "t=i" => \$timeout,    "timeout=i" => \$timeout,
 358                         "T=i" => \$iftype,    "type=i" => \$iftype,
 359                         );
 360
 361
 362         if ($status == 0){
 363                 print_help();
 364                 exit $ERRORS{'OK'};
 365         }
 366
 367         if ($opt_V) {
 368                 print_revision($PROGNAME,'@NP_VERSION@');
 369                 exit $ERRORS{'OK'};
 370         }
 371
 372         if ($opt_h) {
 373                 print_help();
 374                 exit $ERRORS{'OK'};
 375         }
 376
 377         if (! utils::is_hostname($hostname)){
 378                 usage("Hostname invalid or not given");
 379         }
 380
 381         unless ($snmpkey > 0 || defined $ifdescr || defined $iftype){
 382                 usage("Either a valid snmp key (-k) or a ifDescr (-d) must be provided");
 383         }
 384
 385         if (defined $ifName) {
 386                 $ifXTable=1;
 387         }
 388
 389         if (defined $dormantWarn) {
 390                 unless ($dormantWarn =~ /^(w|c|i)$/ ) {
 391                         printf "Dormant alerts must be one of w|c|i \n";
 392                         exit $ERRORS{'UNKNOWN'};
 393                 }
 394         }
 395
 396         unless (defined $timeout) {
 397                 $timeout = $TIMEOUT;
 398         }
 399
 400         if ($snmp_version !~ /[123]/){
 401                 $state='UNKNOWN';
 402                 print ("$state: No support for SNMP v$snmp_version yet\n");
 403                 exit $ERRORS{$state};
 404         }
 405
 406         %session_opts = (
 407                 -hostname   => $hostname,
 408                 -port       => $port,
 409                 -version    => $snmp_version,
 410                 -maxmsgsize => $maxmsgsize
 411         );
 412
 413         $session_opts{'-community'} = $community if (defined $community && $snmp_version =~ /[12]/);
 414
 415         if ($snmp_version =~ /3/ ) {
 416                 # Must define a security level even though default is noAuthNoPriv
 417                 # v3 requires a security username
 418                 if (defined $seclevel && defined $secname) {
 419                         $session_opts{'-username'} = $secname;
 420
 421                         # Must define a security level even though defualt is noAuthNoPriv
 422                         unless ( grep /^$seclevel$/, qw(noAuthNoPriv authNoPriv authPriv) ) {
 423                                 usage("Must define a valid security level even though default is noAuthNoPriv");
 424                         }
 425
 426                         # Authentication wanted
 427                         if ( $seclevel eq 'authNoPriv' || $seclevel eq 'authPriv' ) {
 428                                 if (defined $authproto && $authproto ne 'MD5' && $authproto ne 'SHA1') {
 429                                         usage("Auth protocol can be either MD5 or SHA1");
 430                                 }
 431                                 $session_opts{'-authprotocol'} = $authproto if(defined $authproto);
 432
 433                                 if ( !defined $authpass) {
 434                                         usage("Auth password/key is not defined");
 435                                 }else{
 436                                         if ($authpass =~ /^0x/ ) {
 437                                                 $session_opts{'-authkey'} = $authpass ;
 438                                         }else{
 439                                                 $session_opts{'-authpassword'} = $authpass ;
 440                                         }
 441                                 }
 442                         }
 443
 444                         # Privacy (DES encryption) wanted
 445                         if ($seclevel eq 'authPriv' ) {
 446                                 if (! defined $privpass) {
 447                                         usage("Privacy passphrase/key is not defined");
 448                                 }else{
 449                                         if ($privpass =~ /^0x/){
 450                                                 $session_opts{'-privkey'} = $privpass;
 451                                         }else{
 452                                                 $session_opts{'-privpassword'} = $privpass;
 453                                         }
 454                                 }
 455
 456                                 $session_opts{'-privprotocol'} = $privproto if(defined $privproto);
 457                         }
 458
 459                         # Context name defined or default
 460                         unless ( defined $context) {
 461                                 $context = "";
 462                         }
 463
 464                 }else {
 465                         usage("Security level or name is not defined");
 466                 }
 467         } # end snmpv3
 468
 469
 470 }
 471 ## End validation
 472