I stumbled upon a great Perl script for Nagios.
What it does is reading out SNMP values on a Cisco switch and interpret those value's to show the results of which interfaces are not use for a number of days.
Now here comes the catch, the script uses the OID 1.3.6.1.2.1.1.3.0 (sysUpTime) but the sysUpTime is a 32-bit counter and will roll over after 496 days.
But i can poll snmpEngineId (.1.3.6.1.6.3.10.2.1.3) which returns the uptime in seconds and should not roll over for 135 years.
Now is the question how can i make the perl script interpret the seconds to days and show me the right results, i've try'd a few perl scripts to caculate seconds to days and try'd to implement it with no luck (duh) i just dont have enough experience with perl.
Can anyone on this forum help out?
Code: Select all
#!/usr/bin/perl
#
############################## check_snmp_free_interfaces.pl ##############################
# #
# Description : Count the number of free interfaces more than X days on a switch #
# Date : Apr 08 2011 #
# Author : R. Lorenzini #
# #
########################################################################################
#
# Help : ./check_snmp_free_interfaces.pl -h
#
use Net::SNMP;
use Getopt::Long;
Getopt::Long::Configure('bundling');
GetOptions
("h" => \$opt_h, "help" => \$opt_h,
"H=s" => \$opt_H, "hostname=s" => \$opt_H,
"C=s" => \$opt_C, "community=s" => \$opt_C,
"w=s" => \$opt_w, "warning=s" => \$opt_w,
"c=s" => \$opt_c, "warning=s" => \$opt_c,
"d=s" => \$opt_d, "delay=s" => \$opt_d,
"e" => \$opt_e, "extended" => \$opt_e);
$script = "check_snmp_free_interfaces.pl";
$script_version = "1.0";
# SNMP options
$version = "2c";
$timeout = 2;
$number_of_interfaces = 0;
@target_interface_index = (0);
@target_interface_descr = (0);
$target_interface = "ethernet";
$oid_ifnumber = ".1.3.6.1.2.1.2.1.0";
$oid_sysdescr = ".1.3.6.1.2.1.1.1.0";
$oid_ifdescr = ".1.3.6.1.2.1.2.2.1.2"; # need to append integer for specific interface
$oid_ifadminstatus = ".1.3.6.1.2.1.2.2.1.7."; # need to append integer for specific interface
$oid_ifoperstatus = ".1.3.6.1.2.1.2.2.1.8."; # need to append integer for specific interface
$oid_iflastchange = ".1.3.6.1.2.1.2.2.1.9."; # need to append integer for specific interface
$oid_uptime = ".1.3.6.1.2.1.1.3.0";
$ifadminstatus = "n/a";
$ifoperstatus = "n/a";
$iflastchange = "n/a";
$returnstring = "";
$warning = 5;
$critical = 2;
$community = "public"; # Default community string
if ($opt_h){
usage();
exit(0);
}
if ($opt_H){
$hostname = $opt_H;
}
else {
print "No specified hostname\n";
usage();
exit(0);
}
if ($opt_C){
$community = $opt_C;
}
if ($opt_d){
$delais = $opt_d;
}
else {
print "No specified delay\n";
usage();
exit(0);
}
if ($opt_w){
$warning = $opt_w;
}
if ($opt_c){
$critical = $opt_c;
}
# Create the SNMP session
$version = "1";
($s, $e) = Net::SNMP->session(
-community => $community,
-hostname => $hostname,
-version => $version,
-timeout => $timeout,
);
if (!defined($s->get_request($oid_sysdescr))) {
# If we can't connect using SNMPv1 lets try as SNMPv2
$s->close();
sleep 0.5;
$version = "2c";
($s, $e) = Net::SNMP->session(
-community => $community,
-hostname => $hostname,
-version => $version,
-timeout => $timeout,
);
if (!defined($s->get_request($oid_sysdescr))) {
print "Agent not responding, tried SNMP v1 and v2\n";
exit(1);
}
}
if (find_match() == 0){
$nb_if_libre = 0;
$count = 1;
$res = $s->get_request(-varbindlist => [ $oid_uptime ],);
@SysUptime = split(/\ /,$res->{$oid_uptime});
if ( $SysUptime[0] < $delais ) {
$status = 1;
$returnstring = "Switch uptime lower than defined delay (Uptime is $SysUptime[0] days)";
}
else {
while ($count < ($#target_interface_index + 1)) {
if (probe_interface() == 1) {
$nb_if_libre = $nb_if_libre + 1;
}
$count = $count + 1 ;
}
if ($nb_if_libre > $warning) {
$status = 0;
$returnstring = "$nb_if_libre free interfaces on this switch | free_ports=$nb_if_libre";
}
else {
if ($nb_if_libre > $critical) {
$status = 1;
$returnstring = "$nb_if_libre free interfaces on this switch | free_ports=$nb_if_libre";
}
else {
$status = 2;
$returnstring = "$nb_if_libre free interfaces on this switch | free_ports=$nb_if_libre";
}
}
}
}
else {
$status = 2;
print "Interface $target_interface not found on device $hostname\n";
exit $status;
}
# Close the session
$s->close();
if($status == 0){
print "OK - $returnstring\n";
exit $status;
}
elsif($status == 1){
print "Warning - $returnstring\n";
exit $status;
}
elsif($status == 2){
print "CRITICAL - $returnstring\n";
exit $status;
}
else{
print "Plugin error! SNMP status unknown\n";
exit $status;
}
exit 2;
#################################################
# Finds match for supplied interface name
#################################################
sub find_match {
if (!defined($s->get_request($oid_ifnumber))) {
if (!defined($s->get_request($oid_sysdescr))) {
print "Status is a Warning Level - SNMP agent not responding\n";
exit 1;
}
else {
print "Status is a Warning Level - SNMP OID does not exist\n";
exit 1;
}
}
if (!defined($s->get_table($oid_ifdescr))){
}
else {
foreach ($s->var_bind_names()) {
$temp_interface_descr = $s->var_bind_list()->{$_};
if (index(lc($temp_interface_descr),lc($target_interface)) != -1) {
@res = split(/\./,$_);
push (@target_interface_index, $res[$#res]);
push(@target_interface_descr,$temp_interface_descr);
}
}
}
if ($#target_interface_index == 0){
return 1;
}
else {
return 0;
}
}
####################################################################
# Gathers data about target interface #
####################################################################
sub probe_interface {
$oid_temp = $oid_ifadminstatus . $target_interface_index[$count];
if (!defined($s->get_request($oid_temp))) {
}
else {
foreach ($s->var_bind_names()) {
$ifadminstatus = $s->var_bind_list()->{$_};
}
}
############################
$oid_temp = $oid_ifoperstatus . $target_interface_index[$count];
if (!defined($s->get_request($oid_temp))) {
}
else {
foreach ($s->var_bind_names()) {
$ifoperstatus = $s->var_bind_list()->{$_};
}
}
############################
$oid_temp = $oid_iflastchange . $target_interface_index[$count];
if (!defined($s->get_request($oid_temp))) {
}
else {
foreach ($s->var_bind_names()) {
$iflastchange = $s->var_bind_list()->{$_};
}
}
############################
if (($ifadminstatus eq "2") || ($ifoperstatus eq "2")) {
@lastchange = split(/\ /,$iflastchange);
if ($lastchange[1] eq "days,") {
$res = $SysUptime[0] - $lastchange[0];
}
else {
$res = $SysUptime[0];
}
if ($res > $delais)
{
if ($opt_e) {
print "Interface ",$target_interface_descr[$count]," is free for ",$res," days.\n";
}
return 1;
}
else {
return 0;
}
}
else {
return 0;
}
}
####################################################################
# help and usage information #
####################################################################
sub usage {
print << "USAGE";
--------------------------------------------------------------------
$script v$script_version
Return the number of interfaces down for more than X days..
Usage: $script -H <hostname> -c <community> [...]
Options: -H Hostname or IP address
-C Community (default is public)
-d Number of days since interfaces are down
-w Warning free interfaces - default 5
-c Critical free interfaces - default 2
-e Extended view
USAGE
exit 1;
}
####################################################################
# Appends string to existing $returnstring #
####################################################################
sub append {
my $appendstring = @_[0];
$returnstring = "$returnstring$appendstring";
}
