plugins-scripts/check_ifstatus.pl

   1 #!/usr/local/bin/perl -w
   2 #
   3 # check_ifstatus.pl - nagios plugin
   4 #
   5 #
   6 # Copyright (C) 2000 Christoph Kron
   7 # Modified 5/2002 to conform to updated Nagios Plugin Guidelines (S. Ghosh)
   8 #  Added -x option (4/2003)
   9 #  Added -u option (4/2003)
  10 #  Added -M option (10/2003)
  11 #  Added SNMPv3 support (10/2003)
  12 #
  13 # This program is free software; you can redistribute it and/or
  14 # modify it under the terms of the GNU General Public License
  15 # as published by the Free Software Foundation; either version 2
  16 # of the License, or (at your option) any later version.
  17 #
  18 # This program is distributed in the hope that it will be useful,
  19 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  20 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  21 # GNU General Public License for more details.
  22 #
  23 # You should have received a copy of the GNU General Public License
  24 # along with this program; if not, write to the Free Software
  25 # Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
  26 #
  27 #
  28 # Report bugs to: ck@zet.net, nagiosplug-help@lists.sf.net
  29 #
  30 # 11.01.2000 Version 1.0
  31 #
  32
  33 use POSIX;
  34 use strict;
  35 use lib utils.pm ;
  36 use utils qw($TIMEOUT %ERRORS &print_revision &support);
  37
  38 use Net::SNMP;
  39 use Getopt::Long;
  40 Getopt::Long::Configure('bundling');
  41
  42 my $PROGNAME = "check_ifstatus";
  43
  44 sub print_help ();
  45 sub usage ();
  46 sub process_arguments ();
  47
  48
  49 my $status;
  50 my %ifOperStatus =      ('1','up',
  51                          '2','down',
  52                          '3','testing',
  53                          '4','unknown',
  54                          '5','dormant',
  55                          '6','notPresent',
  56                          '7','lowerLayerDown');  # down due to the state of lower layer interface(s));
  57
  58 my $timeout ;
  59 my $state = "UNKNOWN";
  60 my $answer = "";
  61 my $snmpkey=0;
  62 my $snmpoid=0;
  63 my $key=0;
  64 my $community = "public";
  65 my $maxmsgsize = 1472 ; # Net::SNMP default is 1472
  66 my ($seclevel, $authproto, $secname, $authpass, $privpass, $auth, $priv, $context);
  67 my $port = 161;
  68 my @snmpoids;
  69 my $snmpIfAdminStatus = '1.3.6.1.2.1.2.2.1.7';
  70 my $snmpIfDescr = '1.3.6.1.2.1.2.2.1.2';
  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 $snmpIfAlias = '1.3.6.1.2.1.31.1.1.1.18';
  74 my $snmpLocIfDescr = '1.3.6.1.4.1.9.2.2.1.1.28';
  75 my $snmpIfType = '1.3.6.1.2.1.2.2.1.3';
  76 my $hostname;
  77 my $session;
  78 my $error;
  79 my $response;
  80 my %ifStatus;
  81 my $ifup =0 ;
  82 my $ifdown =0;
  83 my $ifdormant = 0;
  84 my $ifexclude = 0 ;
  85 my $ifunused = 0;
  86 my $ifmessage = "";
  87 my $snmp_version = 1;
  88 my $ifXTable;
  89 my $opt_h ;
  90 my $opt_V ;
  91 my $opt_u;
  92 my $opt_x ;
  93 my %excluded ;
  94 my @unused_ports ;
  95
  96
  97
  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 timeout)\n");
 103      exit $ERRORS{"UNKNOWN"};
 104 };
 105
 106
 107 #Option checking
 108 $status = process_arguments();
 109
 110 if ($status != 0)
 111 {
 112         print_help() ;
 113         exit $ERRORS{'OK'};
 114 }
 115
 116
 117 alarm($timeout);
 118
 119 push(@snmpoids,$snmpIfOperStatus);
 120 push(@snmpoids,$snmpIfAdminStatus);
 121 push(@snmpoids,$snmpIfDescr);
 122 push(@snmpoids,$snmpIfType);
 123 push(@snmpoids,$snmpIfName) if ( defined $ifXTable);
 124 push(@snmpoids,$snmpIfAlias) if ( defined $ifXTable);
 125
 126
 127
 128
 129 foreach $snmpoid (@snmpoids) {
 130
 131    if (!defined($response = $session->get_table($snmpoid))) {
 132       $answer=$session->error;
 133       $session->close;
 134       $state = 'CRITICAL';
 135                         if ( ( $snmpoid =~ $snmpIfName ) && defined $ifXTable ) {
 136                                 print ("$state: Device does not support ifTable - try without -I option\n");
 137                         }else{
 138                                 print ("$state: $answer for $snmpoid  with snmp version $snmp_version\n");
 139                         }
 140       exit $ERRORS{$state};
 141    }
 142
 143    foreach $snmpkey (keys %{$response}) {
 144       $snmpkey =~ /.*\.(\d+)$/;
 145       $key = $1;
 146       $ifStatus{$key}{$snmpoid} = $response->{$snmpkey};
 147    }
 148 }
 149
 150
 151 $session->close;
 152
 153 alarm(0);
 154
 155 foreach $key (keys %ifStatus) {
 156
 157         # skip unused interfaces
 158         if (!defined($ifStatus{$key}{'notInUse'})) {
 159                 # check only if interface is administratively up
 160     if ($ifStatus{$key}{$snmpIfAdminStatus} == 1 ) {
 161
 162                         # check only if interface type is not listed in %excluded
 163                         if (!defined $excluded{$ifStatus{$key}{$snmpIfType}} ) {
 164                                 if ($ifStatus{$key}{$snmpIfOperStatus} == 1 ) { $ifup++ ;}
 165                                 if ($ifStatus{$key}{$snmpIfOperStatus} == 2 ) {
 166                                                                 $ifdown++ ;
 167                                                                 if (defined $ifXTable) {
 168                                                                         $ifmessage .= sprintf("%s: down -> %s<BR>",
 169                                 $ifStatus{$key}{$snmpIfName},
 170                                                                                                                                 $ifStatus{$key}{$snmpIfAlias});
 171                                                                 }else{
 172                                                                         $ifmessage .= sprintf("%s: down <BR>",
 173                                                                                                                                 $ifStatus{$key}{$snmpIfDescr});
 174                                                                 }
 175                                 }
 176                                 if ($ifStatus{$key}{$snmpIfOperStatus} == 5 ) { $ifdormant++ ;}
 177                         }else{
 178                                 $ifexclude++;
 179                         }
 180
 181                 }
 182         }else{
 183                 $ifunused++;
 184         }
 185 }
 186
 187    if ($ifdown > 0) {
 188       $state = 'CRITICAL';
 189       $answer = sprintf("host '%s', interfaces up: %d, down: %d, dormant: %d, excluded: %d, unused: %d<BR>",
 190                         $hostname,
 191                         $ifup,
 192                         $ifdown,
 193                         $ifdormant,
 194                         $ifexclude,
 195                         $ifunused);
 196       $answer = $answer . $ifmessage . "\n";
 197    }
 198    else {
 199       $state = 'OK';
 200       $answer = sprintf("host '%s', interfaces up: %d, down: %d, dormant: %d, excluded: %d, unused: %d",
 201                         $hostname,
 202                         $ifup,
 203                         $ifdown,
 204                         $ifdormant,
 205                         $ifexclude,
 206                         $ifunused);
 207    }
 208 my $perfdata = sprintf("up=%d,down=%d,dormant=%d,excluded=%d,unused=%d",$ifup,$ifdown,$ifdormant,$ifexclude,$ifunused);
 209 print ("$state: $answer |$perfdata\n");
 210 exit $ERRORS{$state};
 211
 212
 213 sub usage (){
 214         printf "\nMissing arguments!\n";
 215         printf "\n";
 216         printf "check_ifstatus -C <READCOMMUNITY> -p <PORT> -H <HOSTNAME>\n";
 217         printf "Copyright (C) 2000 Christoph Kron\n";
 218         printf "Updates 5/2002 Subhendu Ghosh\n";
 219         printf "\n\n";
 220         support();
 221         exit $ERRORS{"UNKNOWN"};
 222 }
 223
 224 sub print_help (){
 225         printf "check_ifstatus plugin for Nagios monitors operational \n";
 226         printf "status of each network interface on the target host\n";
 227         printf "\nUsage:\n";
 228         printf "   -H (--hostname)   Hostname to query - (required)\n";
 229         printf "   -C (--community)  SNMP read community (defaults to public,\n";
 230         printf "                     used with SNMP v1 and v2c\n";
 231         printf "   -v (--snmp_version)  1 for SNMP v1 (default)\n";
 232         printf "                        2 for SNMP v2c\n";
 233         printf "                          SNMP v2c will use get_bulk for less overhead\n";
 234         printf "                        3 for SNMPv3 (requires -U option)";
 235         printf "   -p (--port)       SNMP port (default 161)\n";
 236         printf "   -I (--ifmib)      Agent supports IFMIB ifXTable.  For Cisco - this will provide\n";
 237         printf "                     the descriptive name.  Do not use if you don't know what this is. \n";
 238         printf "   -x (--exclude)    A comma separated list of ifType values that should be excluded \n";
 239         printf "                     from the report (default for an empty list is PPP(23).\n";
 240         printf "   -u (--unused_ports) A comma separated list of ifIndex values that should be excluded \n";
 241         printf "                     from the report (default is an empty exclusion list).\n";
 242         printf "                     See the IANAifType-MIB for a list of interface types.\n";
 243         printf "   -L (--seclevel)   choice of \"noAuthNoPriv\", \"authNoPriv\", or     \"authPriv\"\n";
 244         printf "   -U (--secname)    username for SNMPv3 context\n";
 245         printf "   -c (--context)    SNMPv3 context name (default is empty      string)";
 246         printf "   -A (--authpass)   authentication password (cleartext ascii or localized key\n";
 247         printf "                     in hex with 0x prefix generated by using   \"snmpkey\" utility\n";
 248         printf "                     auth password and authEngineID\n";
 249         printf "   -a (--authproto)  Authentication protocol ( MD5 or SHA1)\n";
 250         printf "   -X (--privpass)   privacy password (cleartext ascii or localized key\n";
 251         printf "                     in hex with 0x prefix generated by using   \"snmpkey\" utility\n";
 252         printf "                     privacy password and authEngineID\n";
 253         printf "   -M (--maxmsgsize) Max message size - usefull only for v1 or v2c\n";
 254         printf "   -t (--timeout)    seconds before the plugin times out (default=$TIMEOUT)\n";
 255         printf "   -V (--version)    Plugin version\n";
 256         printf "   -h (--help)       usage help \n\n";
 257         print_revision($PROGNAME, '@NP_VERSION@');
 258
 259 }
 260
 261 sub process_arguments() {
 262         $status = GetOptions(
 263                 "V"   => \$opt_V, "version"    => \$opt_V,
 264                 "h"   => \$opt_h, "help"       => \$opt_h,
 265                 "v=i" => \$snmp_version, "snmp_version=i"  => \$snmp_version,
 266                 "C=s" => \$community,"community=s" => \$community,
 267                 "L=s" => \$seclevel, "seclevel=s" => \$seclevel,
 268                 "a=s" => \$authproto, "authproto=s" => \$authproto,
 269                 "U=s" => \$secname,   "secname=s"   => \$secname,
 270                 "A=s" => \$authpass,  "authpass=s"  => \$authpass,
 271                 "X=s" => \$privpass,  "privpass=s"  => \$privpass,
 272                 "c=s" => \$context,   "context=s"   => \$context,
 273                 "p=i" =>\$port, "port=i" => \$port,
 274                 "H=s" => \$hostname, "hostname=s" => \$hostname,
 275                 "I"             => \$ifXTable, "ifmib" => \$ifXTable,
 276                 "x:s"           =>      \$opt_x,   "exclude:s" => \$opt_x,
 277                 "u=s" => \$opt_u,  "unused_ports=s" => \$opt_u,
 278                 "M=i" => \$maxmsgsize, "maxmsgsize=i" => \$maxmsgsize,
 279                 "t=i" => \$timeout,    "timeout=i" => \$timeout,
 280                 );
 281
 282         if ($status == 0){
 283                 print_help() ;
 284                 exit $ERRORS{'OK'};
 285         }
 286         if ($opt_V) {
 287                 print_revision($PROGNAME,'@NP_VERSION@');
 288                 exit $ERRORS{'OK'};
 289         }
 290
 291         if ($opt_h) {
 292                 print_help();
 293                 exit $ERRORS{'OK'};
 294         }
 295
 296         unless (defined $timeout) {
 297                 $timeout = $TIMEOUT;
 298         }
 299
 300         if ($snmp_version =~ /3/ ) {
 301                 # Must define a security level even though default is noAuthNoPriv
 302                 # v3 requires a security username
 303                 if (defined $seclevel  && defined $secname) {
 304
 305                         # Must define a security level even though defualt is noAuthNoPriv
 306                         unless ($seclevel eq ('noAuthNoPriv' || 'authNoPriv' || 'authPriv' ) ) {
 307                                 usage();
 308                                 exit $ERRORS{"UNKNOWN"};
 309                         }
 310
 311                         # Authentication wanted
 312                         if ($seclevel eq ('authNoPriv' || 'authPriv') ) {
 313
 314                                 unless ($authproto eq ('MD5' || 'SHA1') ) {
 315                                         usage();
 316                                         exit $ERRORS{"UNKNOWN"};
 317                                 }
 318
 319                                 if ( !defined $authpass) {
 320                                         usage();
 321                                         exit $ERRORS{"UNKNOWN"};
 322                                 }else{
 323                                         if ($authpass =~ /^0x/ ) {
 324                                                 $auth = "-authkey => $authpass" ;
 325                                         }else{
 326                                                 $auth = "-authpassword => $authpass";
 327                                         }
 328                                 }
 329
 330                         }
 331
 332                         # Privacy (DES encryption) wanted
 333                         if ($seclevel eq  'authPriv' ) {
 334                                 if (! defined $privpass) {
 335                                         usage();
 336                                         exit $ERRORS{"UNKNOWN"};
 337                                 }else{
 338                                         if ($privpass =~ /^0x/){
 339                                                 $priv = "-privkey => $privpass";
 340                                         }else{
 341                                                 $priv = "-privpassword => $privpass";
 342                                         }
 343                                 }
 344                         }
 345
 346                         # Context name defined or default
 347
 348                         unless ( defined $context) {
 349                                 $context = "";
 350                         }
 351
 352
 353
 354                 }else {
 355                                         usage();
 356                                         exit $ERRORS{'UNKNOWN'}; ;
 357                 }
 358         } # end snmpv3
 359
 360         # for snmp v1 & v2c we default to community = "public"
 361
 362         # Excluded interfaces types (ifType) (backup interfaces, dial-on demand interfaces, PPP interfaces
 363         if (defined $opt_x) {
 364                 my @x = split(/,/, $opt_x);
 365                 if ( @x) {
 366                         foreach $key (@x){
 367                                 $excluded{$key} = 1;
 368                         }
 369                 }else{
 370                         $excluded{23} = 1; # default PPP(23) if empty list - note (AIX seems to think PPP is 22 according to a post)
 371                 }
 372         }
 373
 374         # Excluded interface ports (ifIndex) - management reasons
 375         if ($opt_u) {
 376                 @unused_ports = split(/,/,$opt_u);
 377                 foreach $key (@unused_ports) {
 378                         $ifStatus{$key}{'notInUse'}++ ;
 379                 }
 380         }
 381
 382         if (! utils::is_hostname($hostname)){
 383                 usage();
 384                 exit $ERRORS{"UNKNOWN"};
 385         }
 386
 387         # create SNMP session handle based on options passed.
 388
 389         if ( ! $snmp_version ) {
 390                 $snmp_version =1 ;
 391         }else{
 392                 if ( $snmp_version =~ /[12]/ ) {
 393
 394                         ($session, $error) = Net::SNMP->session(
 395                                                 -hostname  => $hostname,
 396                                                 -community => $community,
 397                                                 -port      => $port,
 398                                                 -version        => $snmp_version,
 399                                                 -maxmsgsize => $maxmsgsize
 400                          );
 401
 402                 if (!defined($session)) {
 403                                         $state='UNKNOWN';
 404                                         $answer=$error;
 405                                         print ("$state: $answer");
 406                                         exit $ERRORS{$state};
 407                 }
 408
 409
 410         }elsif ( $snmp_version =~ /3/ ) {
 411
 412                 if ($seclevel eq 'noAuthNoPriv') {
 413                         ($session, $error) = Net::SNMP->session(
 414                                 -hostname  => $hostname,
 415                                 -port      => $port,
 416                                 -version  => $snmp_version,
 417                                 -username => $secname,
 418                         );
 419
 420                 }elsif ( $seclevel eq 'authNoPriv' ) {
 421                         ($session, $error) = Net::SNMP->session(
 422                                 -hostname  => $hostname,
 423                                 -port      => $port,
 424                                 -version  => $snmp_version,
 425                                 -username => $secname,
 426                                 -authprotocol => $authproto,
 427                                 $auth
 428                         );
 429                 }elsif ($seclevel eq 'authPriv' ) {
 430                         ($session, $error) = Net::SNMP->session(
 431                                 -hostname  => $hostname,
 432                                 -port      => $port,
 433                                 -version  => $snmp_version,
 434                                 -username => $secname,
 435                                 -authprotocol => $authproto,
 436                                 $auth,
 437                                 $priv
 438                         );
 439                 }
 440
 441
 442                 if (!defined($session)) {
 443                                         $state='UNKNOWN';
 444                                         $answer=$error;
 445                                         print ("$state: $answer");
 446                                         exit $ERRORS{$state};
 447                 }
 448
 449         }else{
 450                 $state='UNKNOWN';
 451                 print ("$state: No support for SNMP v$snmp_version yet\n");
 452                 exit $ERRORS{$state};
 453         }
 454 }
 455
 456 return $ERRORS{"OK"};
 457
 458 }