#! /opt/coolstack/bin/perl -w # vim:foldmethod=syntax:tabstop=4:shiftwidth=4 # # Matthew Martin, Tuesday August 14, 2007 # Problems with check_ifstatus.pl # 1) "No response from remote host" should be unknown, not critical, right? # 2) Serial link "dormant" should be critical, not okay # 3) dormant, excluded and unused interfaces are not correctly counted # 4) add some default exclusions # # check_ifstatus.pl - nagios plugin # # # Copyright (C) 2000 Christoph Kron # Modified 5/2002 to conform to updated Nagios Plugin Guidelines (S. Ghosh) # Added -x option (4/2003) # Added -u option (4/2003) # Added -M option (10/2003) # 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: ck@zet.net, nagiosplug-help@lists.sf.net # # 11.01.2000 Version 1.0 # # $Id: check_ifstatus.pl 884 2004-08-18 19:51:35Z tonvoon $ use POSIX; use strict; use lib "/opt/nagios-3.0.5/libexec" ; use utils qw($TIMEOUT %ERRORS &print_revision &support); use Net::SNMP; use Getopt::Long; Getopt::Long::Configure('bundling'); my $PROGNAME = "check_ifstatus"; sub print_help (); sub usage (); sub process_arguments (); 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 $timeout ; my $state = "UNKNOWN"; my $answer = ""; my $snmpkey=0; my $snmpoid=0; my $key=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 $snmpIfAdminStatus = '1.3.6.1.2.1.2.2.1.7'; my $snmpIfDescr = '1.3.6.1.2.1.2.2.1.2'; 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 $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 $snmpIfType = '1.3.6.1.2.1.2.2.1.3'; my $hostname; my $session; my $error; my $response; my %ifStatus; my $ifup =0 ; my $ifdown =0; my $ifdormant = 0; my $ifexclude = 0 ; my $ifunused = 0; my $ifmessage = ""; my $snmp_version = 1; my $ifXTable; my $opt_h ; my $opt_V ; my $opt_u; my $opt_x ; my %excluded ; my @unused_ports ; # Just in case of problems, let's not hang Nagios $SIG{'ALRM'} = sub { print ("ERROR: No snmp response from $hostname (alarm timeout)\n"); exit $ERRORS{"UNKNOWN"}; }; #Option checking $status = process_arguments(); if ($status != 0) { print_help() ; exit $ERRORS{'OK'}; } alarm($timeout); push(@snmpoids,$snmpIfOperStatus); push(@snmpoids,$snmpIfAdminStatus); push(@snmpoids,$snmpIfDescr); push(@snmpoids,$snmpIfType); push(@snmpoids,$snmpIfName) if ( defined $ifXTable); push(@snmpoids,$snmpIfAlias) if ( defined $ifXTable); foreach $snmpoid (@snmpoids) { if (!defined($response = $session->get_table($snmpoid))) { $answer=$session->error; $session->close; # mgmart6. Tuesday August 14, 2007 # I think a SNMP error should give UNKNOWN, not CRITICAL #$state = 'CRITICAL'; $state = 'UNKNOWN'; if ( ( $snmpoid =~ $snmpIfName ) && defined $ifXTable ) { print ("$state: Device does not support ifTable - try without -I option\n"); }else{ print ("$state: $answer for $snmpoid with snmp version $snmp_version\n"); } exit $ERRORS{$state}; } foreach $snmpkey (keys %{$response}) { $snmpkey =~ /.*\.(\d+)$/; $key = $1; $ifStatus{$key}{$snmpoid} = $response->{$snmpkey}; } } $session->close; alarm(0); # mgmart6. This script cannot tell that specific logical interfaces are # associated with their phys IF so it checks them all. foreach $key (keys %ifStatus) { # Skip interfaces flagged with -u (--unused_ports) # "A comma separated list of ifIndex values that should be excluded" if (!defined($ifStatus{$key}{'notInUse'})) { # check only if interface is administratively up if ($ifStatus{$key}{$snmpIfAdminStatus} == 1 ) { # check only if interface type is not listed in %excluded if (!defined $excluded{$ifStatus{$key}{$snmpIfType}} ) { if ($ifStatus{$key}{$snmpIfOperStatus} == 1 ) { $ifup++ ;} if ($ifStatus{$key}{$snmpIfOperStatus} == 2 ) { $ifdown++ ; if (defined $ifXTable) { $ifmessage .= sprintf("%s: down -> %s
", $ifStatus{$key}{$snmpIfName}, $ifStatus{$key}{$snmpIfAlias}); }else{ $ifmessage .= sprintf("%s: down
", $ifStatus{$key}{$snmpIfDescr}); } } if ($ifStatus{$key}{$snmpIfOperStatus} == 5 ) { $ifdormant++ ;} # Matthew Martin Interface is listed in %excluded } else { $ifexclude++; } # mgmart6 If not administratively up, mark as unused. } elsif ($ifStatus{$key}{$snmpIfAdminStatus} == 2 ) { $ifunused++; } }else{ # mgmart6. Original line: $ifunused++; # actually matches the flag # -u (--unused_ports) A comma separated list of ifIndex values that should be excluded # They should be marked as excluded, not unused. $ifexclude++; } } # mgmart6 # The original has dormant serial interfaces return status of "OK". # A dormant serial connection should be CRITICAL, right? # I changed the following line to address this: #if ($ifdown > 0) { if (($ifdown > 0) || ($ifdormant > 0)) { $state = 'CRITICAL'; $answer = sprintf("host '%s', interfaces up: %d, down: %d, dormant: %d, excluded: %d, unused: %d
", $hostname, $ifup, $ifdown, $ifdormant, $ifexclude, $ifunused); $answer = $answer . $ifmessage . "\n"; } else { $state = 'OK'; $answer = sprintf("host '%s', interfaces up: %d, down: %d, dormant: %d, excluded: %d, unused: %d", $hostname, $ifup, $ifdown, $ifdormant, $ifexclude, $ifunused); } my $perfdata = sprintf("up=%d,down=%d,dormant=%d,excluded=%d,unused=%d",$ifup,$ifdown,$ifdormant,$ifexclude,$ifunused); print ("$state: $answer |$perfdata\n"); exit $ERRORS{$state}; sub usage (){ printf "\nMissing arguments!\n"; printf "\n"; printf "check_ifstatus -C -p -H \n"; printf "Copyright (C) 2000 Christoph Kron\n"; printf "Updates 5/2002 Subhendu Ghosh\n"; printf "\n\n"; support(); exit $ERRORS{"UNKNOWN"}; } sub print_help (){ printf "check_ifstatus plugin for Nagios monitors operational \n"; printf "status of each network interface on the target host\n"; printf "\nUsage:\n"; printf " -H (--hostname) Hostname to query - (required)\n"; printf " -C (--community) SNMP read community (defaults to public,\n"; printf " used with SNMP v1 and v2c\n"; printf " -v (--snmp_version) 1 for SNMP v1 (default)\n"; printf " 2 for SNMP v2c\n"; printf " SNMP v2c will use get_bulk for less overhead\n"; printf " 3 for SNMPv3 (requires -U option)"; printf " -p (--port) SNMP port (default 161)\n"; printf " -I (--ifmib) Agent supports IFMIB ifXTable. For Cisco - this will provide\n"; printf " the descriptive name. Do not use if you don't know what this is. \n"; printf " -x (--exclude) A comma separated list of ifType values that should be excluded \n"; printf " from the report (default for an empty list is PPP(23).\n"; printf " -u (--unused_ports) A comma separated list of ifIndex values that should be excluded \n"; printf " from the report (default is an empty exclusion list).\n"; printf " See the IANAifType-MIB for a list of interface types.\n"; printf " -L (--seclevel) choice of \"noAuthNoPriv\", \"authNoPriv\", or \"authPriv\"\n"; printf " -U (--secname) username for SNMPv3 context\n"; printf " -c (--context) SNMPv3 context name (default is empty string)"; printf " -A (--authpass) authentication password (cleartext ascii or localized key\n"; printf " in hex with 0x prefix generated by using \"snmpkey\" utility\n"; printf " auth password and authEngineID\n"; printf " -a (--authproto) Authentication protocol ( MD5 or SHA1)\n"; printf " -X (--privpass) privacy password (cleartext ascii or localized key\n"; printf " in hex with 0x prefix generated by using \"snmpkey\" utility\n"; printf " privacy password and authEngineID\n"; printf " -M (--maxmsgsize) Max message size - usefull only for v1 or v2c\n"; printf " -t (--timeout) seconds before the plugin times out (default=$TIMEOUT)\n"; printf " -V (--version) Plugin version\n"; printf " -h (--help) usage help \n\n"; print_revision($PROGNAME, '$Revision: 884 $'); } sub process_arguments() { $status = GetOptions( "V" => \$opt_V, "version" => \$opt_V, "h" => \$opt_h, "help" => \$opt_h, "v=i" => \$snmp_version, "snmp_version=i" => \$snmp_version, "C=s" => \$community,"community=s" => \$community, "L=s" => \$seclevel, "seclevel=s" => \$seclevel, "a=s" => \$authproto, "authproto=s" => \$authproto, "U=s" => \$secname, "secname=s" => \$secname, "A=s" => \$authpass, "authpass=s" => \$authpass, "X=s" => \$privpass, "privpass=s" => \$privpass, "c=s" => \$context, "context=s" => \$context, "p=i" =>\$port, "port=i" => \$port, "H=s" => \$hostname, "hostname=s" => \$hostname, "I" => \$ifXTable, "ifmib" => \$ifXTable, "x:s" => \$opt_x, "exclude:s" => \$opt_x, "u=s" => \$opt_u, "unused_ports=s" => \$opt_u, "M=i" => \$maxmsgsize, "maxmsgsize=i" => \$maxmsgsize, "t=i" => \$timeout, "timeout=i" => \$timeout, ); if ($status == 0){ print_help() ; exit $ERRORS{'OK'}; } if ($opt_V) { print_revision($PROGNAME,'$Revision: 884 $ '); exit $ERRORS{'OK'}; } if ($opt_h) { print_help(); exit $ERRORS{'OK'}; } 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 # for snmp v1 & v2c we default to community = "public" # Excluded interfaces types (ifType) (backup interfaces, dial-on demand interfaces, PPP interfaces if (defined $opt_x) { my @x = split(/,/, $opt_x); if ( @x) { foreach $key (@x){ $excluded{$key} = 1; } } # Matthew Martin In the original this else was nested wrong and never matched } else { $excluded{23} = 1; # default PPP(23) if empty list - note (AIX seems to think PPP is 22 according to a post) $excluded{24} = 1; # mgmart6, Tuesday August 14, 2007, Nokia, ifDescr.6 = loop0c0 Software Loopback Layer -- ifType.6 = softwareLoopback(24) (taken from a Nokia IP330) $excluded{25} = 1; # mgmart6, Tuesday August 14, 2007, Nokia, ifDescr.1 = pppoe0 Ethernet Layer -- ifType.1 = eon(25) (from a Nokia IP350) } # Excluded interface ports (ifIndex) - management reasons if ($opt_u) { @unused_ports = split(/,/,$opt_u); foreach $key (@unused_ports) { $ifStatus{$key}{'notInUse'}++ ; } } if (! utils::is_hostname($hostname)){ usage(); exit $ERRORS{"UNKNOWN"}; } # create SNMP session handle based on options passed. if ( ! $snmp_version ) { $snmp_version =1 ; }else{ 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, -authprotocol => $authproto, $auth ); }elsif ($seclevel eq 'authPriv' ) { ($session, $error) = Net::SNMP->session( -hostname => $hostname, -port => $port, -version => $snmp_version, -username => $secname, -authprotocol => $authproto, $auth, $priv ); } if (!defined($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}; } } return $ERRORS{"OK"}; }