#!/usr/local/bin/perl -w # # check_ifoperstatus.pl - nagios plugin # # Copyright (C) 2000 Christoph Kron, # Modified 5/2002 to conform to updated Nagios Plugin Guidelines # Added support for named interfaces per Valdimir Ivaschenko (S. Ghosh) # Added SNMPv3 support (10/2003) # # This program is free software; you can redistribute it and/or # modify it under the terms of the GNU General Public License # as published by the Free Software Foundation; either version 2 # of the License, or (at your option) any later version. # # This program is distributed in the hope that it will be useful, # but WITHOUT ANY WARRANTY; without even the implied warranty of # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the # GNU General Public License for more details. # # You should have received a copy of the GNU General Public License # along with this program; if not, write to the Free Software # Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. # # # Report bugs to: nagiosplug-help@lists.sourceforge.net # # 11.01.2000 Version 1.0 # $Id: check_ifoperstatus.pl,v 1.6 2004/12/07 03:13:14 mattkent Exp $ # # Patches from Guy Van Den Bergh to warn on ifadminstatus down interfaces # instead of critical. # # Primary MIB reference - RFC 2863 use POSIX; use strict; use lib utils.pm ; use utils qw($TIMEOUT %ERRORS &print_revision &support); use Net::SNMP; use Getopt::Long; &Getopt::Long::config('bundling'); my $PROGNAME = "check_ifoperstatus"; sub print_help (); sub usage (); sub process_arguments (); my $timeout; my $status; my %ifOperStatus = ('1','up', '2','down', '3','testing', '4','unknown', '5','dormant', '6','notPresent', '7','lowerLayerDown'); # down due to the state of lower layer interface(s) my $state = "UNKNOWN"; my $answer = ""; my $snmpkey = 0; my $community = "public"; my $maxmsgsize = 1472 ; # Net::SNMP default is 1472 my ($seclevel, $authproto, $secname, $authpass, $privpass, $auth, $priv, $context); my $port = 161; my @snmpoids; my $sysUptime = '1.3.6.1.2.1.1.3.0'; my $snmpIfDescr = '1.3.6.1.2.1.2.2.1.2'; my $snmpIfAdminStatus = '1.3.6.1.2.1.2.2.1.7'; my $snmpIfOperStatus = '1.3.6.1.2.1.2.2.1.8'; my $snmpIfName = '1.3.6.1.2.1.31.1.1.1.1'; my $snmpIfLastChange = '1.3.6.1.2.1.2.2.1.9'; my $snmpIfAlias = '1.3.6.1.2.1.31.1.1.1.18'; my $snmpLocIfDescr = '1.3.6.1.4.1.9.2.2.1.1.28'; my $hostname; my $ifName; my $session; my $error; my $response; my $snmp_version = 1 ; my $ifXTable; my $opt_h ; my $opt_V ; my $ifdescr; my $key; my $lastc; my $dormantWarn; my $adminWarn; my $name; ### Validate Arguments $status = process_arguments(); # Just in case of problems, let's not hang Nagios $SIG{'ALRM'} = sub { print ("ERROR: No snmp response from $hostname (alarm)\n"); exit $ERRORS{"UNKNOWN"}; }; alarm($timeout); ## map ifdescr to ifindex - should look at being able to cache this value if (defined $ifdescr) { # escape "/" in ifdescr - very common in the Cisco world $ifdescr =~ s/\//\\\//g; $status=fetch_ifdescr(); # if using on device with large number of interfaces # recommend use of SNMP v2 (get-bulk) if ($status==0) { $state = "UNKNOWN"; printf "$state: could not retrive ifdescr snmpkey - $status-$snmpkey\n"; $session->close; exit $ERRORS{$state}; } } ## Main function $snmpIfAdminStatus = $snmpIfAdminStatus . "." . $snmpkey; $snmpIfOperStatus = $snmpIfOperStatus . "." . $snmpkey; $snmpIfDescr = $snmpIfDescr . "." . $snmpkey; $snmpIfName = $snmpIfName . "." . $snmpkey ; $snmpIfAlias = $snmpIfAlias . "." . $snmpkey ; push(@snmpoids,$snmpIfAdminStatus); push(@snmpoids,$snmpIfOperStatus); push(@snmpoids,$snmpIfDescr); push(@snmpoids,$snmpIfName) if (defined $ifXTable) ; push(@snmpoids,$snmpIfAlias) if (defined $ifXTable) ; if (!defined($response = $session->get_request(@snmpoids))) { $answer=$session->error; $session->close; $state = 'WARNING'; print ("$state: SNMP error: $answer\n"); exit $ERRORS{$state}; } $answer = sprintf("host '%s', %s(%s) is %s\n", $hostname, $response->{$snmpIfDescr}, $snmpkey, $ifOperStatus{$response->{$snmpIfOperStatus}} ); ## Check to see if ifName match is requested and it matches - exit if no match ## not the interface we want to monitor if ( defined $name && not ($response->{$snmpIfName} eq $name) ) { $state = 'UNKNOWN'; $answer = "Interface name ($name) doesn't match snmp value ($response->{$snmpIfName}) (index $snmpkey)"; print ("$state: $answer"); exit $ERRORS{$state}; } ## define the interface name if (defined $ifXTable) { $name = $response->{$snmpIfName} ." - " .$response->{$snmpIfAlias} ; }else{ $name = $response->{$snmpIfDescr} ; } ## if AdminStatus is down - some one made a consious effort to change config ## if ( not ($response->{$snmpIfAdminStatus} == 1) ) { $answer = "Interface $name (index $snmpkey) is administratively down."; if ( not defined $adminWarn or $adminWarn eq "w" ) { $state = 'WARNING'; } elsif ( $adminWarn eq "i" ) { $state = 'OK'; } elsif ( $adminWarn eq "c" ) { $state = 'CRITICAL'; } else { # If wrong value for -a, say warning $state = 'WARNING'; } } ## Check operational status elsif ( $response->{$snmpIfOperStatus} == 2 ) { $state = 'CRITICAL'; $answer = "Interface $name (index $snmpkey) is down."; } elsif ( $response->{$snmpIfOperStatus} == 5 ) { if (defined $dormantWarn ) { if ($dormantWarn eq "w") { $state = 'WARNING'; $answer = "Interface $name (index $snmpkey) is dormant."; }elsif($dormantWarn eq "c") { $state = 'CRITICAL'; $answer = "Interface $name (index $snmpkey) is dormant."; }elsif($dormantWarn eq "i") { $state = 'OK'; $answer = "Interface $name (index $snmpkey) is dormant."; } }else{ # dormant interface - but warning/critical/ignore not requested $state = 'CRITICAL'; $answer = "Interface $name (index $snmpkey) is dormant."; } } elsif ( $response->{$snmpIfOperStatus} == 6 ) { $state = 'CRITICAL'; $answer = "Interface $name (index $snmpkey) notPresent - possible hotswap in progress."; } elsif ( $response->{$snmpIfOperStatus} == 7 ) { $state = 'CRITICAL'; $answer = "Interface $name (index $snmpkey) down due to lower layer being down."; } elsif ( $response->{$snmpIfOperStatus} == 3 || $response->{$snmpIfOperStatus} == 4 ) { $state = 'CRITICAL'; $answer = "Interface $name (index $snmpkey) down (testing/unknown)."; } else { $state = 'OK'; $answer = "Interface $name (index $snmpkey) is up."; } print ("$state: $answer"); exit $ERRORS{$state}; ### subroutines sub fetch_ifdescr { if (!defined ($response = $session->get_table($snmpIfDescr))) { $answer=$session->error; $session->close; $state = 'CRITICAL'; printf ("$state: SNMP error with snmp version $snmp_version ($answer)\n"); $session->close; exit $ERRORS{$state}; } foreach $key ( keys %{$response}) { if ($response->{$key} =~ /^$ifdescr$/) { $key =~ /.*\.(\d+)$/; $snmpkey = $1; #print "$ifdescr = $key / $snmpkey \n"; #debug } } unless (defined $snmpkey) { $session->close; $state = 'CRITICAL'; printf "$state: Could not match $ifdescr on $hostname\n"; exit $ERRORS{$state}; } return $snmpkey; } sub usage() { printf "\nMissing arguments!\n"; printf "\n"; printf "usage: \n"; printf "check_ifoperstatus -k -H [-C ]\n"; printf "Copyright (C) 2000 Christoph Kron\n"; printf "check_ifoperstatus.pl comes with ABSOLUTELY NO WARRANTY\n"; printf "This programm is licensed under the terms of the "; printf "GNU General Public License\n(check source code for details)\n"; printf "\n\n"; exit $ERRORS{"UNKNOWN"}; } sub print_help() { printf "check_ifoperstatus plugin for Nagios monitors operational \n"; printf "status of a particular network interface on the target host\n"; printf "\nUsage:\n"; printf " -H (--hostname) Hostname to query - (required)\n"; printf " -C (--community) SNMP read community (defaults to public,\n"; printf " used with SNMP v1 and v2c\n"; printf " -v (--snmp_version) 1 for SNMP v1 (default)\n"; printf " 2 for SNMP v2c\n"; printf " SNMP v2c will use get_bulk for less overhead\n"; printf " if monitoring with -d\n"; printf " -L (--seclevel) choice of \"noAuthNoPriv\", \"authNoPriv\", or \"authPriv\"\n"; printf " -U (--secname) username for SNMPv3 context\n"; printf " -c (--context) SNMPv3 context name (default is empty string)"; printf " -A (--authpass) authentication password (cleartext ascii or localized key\n"; printf " in hex with 0x prefix generated by using \"snmpkey\" utility\n"; printf " auth password and authEngineID\n"; printf " -a (--authproto) Authentication protocol ( MD5 or SHA1)\n"; printf " -X (--privpass) privacy password (cleartext ascii or localized key\n"; printf " in hex with 0x prefix generated by using \"snmpkey\" utility\n"; printf " privacy password and authEngineID\n"; printf " -k (--key) SNMP IfIndex value\n"; printf " -d (--descr) SNMP ifDescr value\n"; printf " -p (--port) SNMP port (default 161)\n"; printf " -I (--ifmib) Agent supports IFMIB ifXTable. Do not use if\n"; printf " you don't know what this is. \n"; printf " -n (--name) the value should match the returned ifName\n"; printf " (Implies the use of -I)\n"; printf " -w (--warn =i|w|c) ignore|warn|crit if the interface is dormant (default critical)\n"; printf " -D (--admin-down =i|w|c) same for administratively down interfaces (default warning)\n"; printf " -M (--maxmsgsize) Max message size - usefull only for v1 or v2c\n"; printf " -t (--timeout) seconds before the plugin times out (default=$TIMEOUT)\n"; printf " -V (--version) Plugin version\n"; printf " -h (--help) usage help \n\n"; printf " -k or -d must be specified\n\n"; printf "Note: either -k or -d must be specified and -d is much more network \n"; printf "intensive. Use it sparingly or not at all. -n is used to match against\n"; printf "a much more descriptive ifName value in the IfXTable to verify that the\n"; printf "snmpkey has not changed to some other network interface after a reboot.\n\n"; print_revision($PROGNAME, '$Revision: 1.6 $'); } sub process_arguments() { $status = GetOptions( "V" => \$opt_V, "version" => \$opt_V, "h" => \$opt_h, "help" => \$opt_h, "v=i" => \$snmp_version, "snmp_version=i" => \$snmp_version, "C=s" => \$community, "community=s" => \$community, "L=s" => \$seclevel, "seclevel=s" => \$seclevel, "a=s" => \$authproto, "authproto=s" => \$authproto, "U=s" => \$secname, "secname=s" => \$secname, "A=s" => \$authpass, "authpass=s" => \$authpass, "X=s" => \$privpass, "privpass=s" => \$privpass, "c=s" => \$context, "context=s" => \$context, "k=i" => \$snmpkey, "key=i",\$snmpkey, "d=s" => \$ifdescr, "descr=s" => \$ifdescr, "l=s" => \$lastc, "lastchange=s" => \$lastc, "p=i" => \$port, "port=i" =>\$port, "H=s" => \$hostname, "hostname=s" => \$hostname, "I" => \$ifXTable, "ifmib" => \$ifXTable, "n=s" => \$ifName, "name=s" => \$ifName, "w=s" => \$dormantWarn, "warn=s" => \$dormantWarn, "D=s" => \$adminWarn, "admin-down=s" => \$adminWarn, "M=i" => \$maxmsgsize, "maxmsgsize=i" => \$maxmsgsize, "t=i" => \$timeout, "timeout=i" => \$timeout, ); if ($status == 0){ print_help(); exit $ERRORS{'OK'}; } if ($opt_V) { print_revision($PROGNAME,'$Revision: 1.6 $ '); exit $ERRORS{'OK'}; } if ($opt_h) { print_help(); exit $ERRORS{'OK'}; } if (! utils::is_hostname($hostname)){ usage(); exit $ERRORS{"UNKNOWN"}; } unless ($snmpkey > 0 || defined $ifdescr){ printf "Either a valid snmpkey key (-k) or a ifDescr (-d) must be provided)\n"; usage(); exit $ERRORS{"UNKNOWN"}; } if (defined $name) { $ifXTable=1; } if (defined $dormantWarn) { unless ($dormantWarn =~ /^(w|c|i)$/ ) { printf "Dormant alerts must be one of w|c|i \n"; exit $ERRORS{'UNKNOWN'}; } } unless (defined $timeout) { $timeout = $TIMEOUT; } if ($snmp_version =~ /3/ ) { # Must define a security level even though default is noAuthNoPriv # v3 requires a security username if (defined $seclevel && defined $secname) { # Must define a security level even though defualt is noAuthNoPriv unless ($seclevel eq ('noAuthNoPriv' || 'authNoPriv' || 'authPriv' ) ) { usage(); exit $ERRORS{"UNKNOWN"}; } # Authentication wanted if ($seclevel eq ('authNoPriv' || 'authPriv') ) { unless ($authproto eq ('MD5' || 'SHA1') ) { usage(); exit $ERRORS{"UNKNOWN"}; } if ( !defined $authpass) { usage(); exit $ERRORS{"UNKNOWN"}; }else{ if ($authpass =~ /^0x/ ) { $auth = "-authkey => $authpass" ; }else{ $auth = "-authpassword => $authpass"; } } } # Privacy (DES encryption) wanted if ($seclevel eq 'authPriv' ) { if (! defined $privpass) { usage(); exit $ERRORS{"UNKNOWN"}; }else{ if ($privpass =~ /^0x/){ $priv = "-privkey => $privpass"; }else{ $priv = "-privpassword => $privpass"; } } } # Context name defined or default unless ( defined $context) { $context = ""; } }else { usage(); exit $ERRORS{'UNKNOWN'}; ; } } # end snmpv3 if ( $snmp_version =~ /[12]/ ) { ($session, $error) = Net::SNMP->session( -hostname => $hostname, -community => $community, -port => $port, -version => $snmp_version, -maxmsgsize => $maxmsgsize ); if (!defined($session)) { $state='UNKNOWN'; $answer=$error; print ("$state: $answer"); exit $ERRORS{$state}; } }elsif ( $snmp_version =~ /3/ ) { if ($seclevel eq 'noAuthNoPriv') { ($session, $error) = Net::SNMP->session( -hostname => $hostname, -port => $port, -version => $snmp_version, -username => $secname, ); }elsif ( $seclevel eq 'authNoPriv' ) { ($session, $error) = Net::SNMP->session( -hostname => $hostname, -port => $port, -version => $snmp_version, -username => $secname, $auth, -authprotocol => $authproto, ); }elsif ($seclevel eq 'authPriv' ) { ($session, $error) = Net::SNMP->session( -hostname => $hostname, -port => $port, -version => $snmp_version, -username => $secname, $auth, -authprotocol => $authproto, $priv ); } if (!defined($session)) { $state='UNKNOWN'; $answer=$error; print ("$state: $answer"); exit $ERRORS{$state}; } }else{ $state='UNKNOWN'; print ("$state: No support for SNMP v$snmp_version yet\n"); exit $ERRORS{$state}; } } ## End validation