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#!/usr/bin/perl -w
# nagios: -epn
use strict;
use Net::SNMP;
use Getopt::Long;
use Pod::Usage;
my $rmon_oid = '.1.3.6.1.2.1.2.2.1.2';
my $name_oid = '.1.3.6.1.2.1.31.1.1.1.1';
my $in_oct_oid = '.1.3.6.1.2.1.2.2.1.10';
my $out_oct_oid = '.1.3.6.1.2.1.2.2.1.16';
my $in_uni_pkt_oid = '.1.3.6.1.2.1.2.2.1.11';
my $out_uni_pkt_oid = '.1.3.6.1.2.1.2.2.1.17';
my $in_non_uni_pkt_oid = '.1.3.6.1.2.1.2.2.1.12';
my $out_non_uni_pkt_oid = '.1.3.6.1.2.1.2.2.1.18';
sub snmp_walk($$$) {
my $session = shift;
my $start = shift;
my $callback = shift;
my $oid = $start;
while (1) {
my $results = $session->get_next_request(
-varbindlist => [ $oid ]
);
nagios_die($session->error()) unless $results;
foreach my $result (keys %{ $results }) {
return unless index($result, "${start}.") eq 0;
$oid = $result;
$callback->($start, $result, $results->{$result});
}
}
}
sub get_ifaces($) {
my $session = shift;
my $IFACES;
snmp_walk($session, $rmon_oid, sub ($$) {
my $root = shift;
my $oid = shift;
my $value = shift;
if ($value =~ m/Ethernet|Port/) {
my $id = substr($oid, length($root) + 1);
$value =~ s/RMON://;
$IFACES->{$id}{'name'} = $value;
$IFACES->{$id}{'in'} = 0;
$IFACES->{$id}{'out'} = 0;
}
});
return $IFACES;
}
sub generate_oids ($@) {
my $root = shift;
my @results = ();
foreach my $val (@_) {
push(@results, "${root}.${val}");
}
return @results;
}
sub get_info ($$$$) {
my $session = shift;
my $in_oid = shift;
my $out_oid = shift;
my $IFACES = shift;
foreach my $root ($name_oid, $in_oid, $out_oid) {
my $info = $session->get_request(
-varbindlist => [ generate_oids($root, keys %{ $IFACES }) ]
);
if (defined $info) {
foreach my $oid (keys %{ $info }) {
if (index($oid, $name_oid) eq 0) {
if ($info->{$oid}) {
my $id = substr($oid, length($name_oid) + 1);
$IFACES->{$id}{'name'} = $info->{$oid};
}
}
elsif (index($oid, $in_oid) eq 0) {
my $id = substr($oid, length($in_oid) + 1);
$IFACES->{$id}{'in'} = $info->{$oid};
}
elsif (index($oid, $out_oid) eq 0) {
my $id = substr($oid, length($out_oid) + 1);
$IFACES->{$id}{'out'} = $info->{$oid};
}
}
}
else {
nagios_die($session->error());
}
}
return $IFACES;
}
sub nagios_die ($) {
my $err = shift;
$err = "Unknown error" unless defined $err;
print "SNMP UNKNOWN - $err\n";
exit 3;
}
my $host;
my $port = 161;
my $community = 'public';
my $timeout = 10;
my $packets = 0;
my $non_unicast_packets = 0;
my $help = 0;
Getopt::Long::Configure ("bundling");
GetOptions('host|H=s' => \$host,
'port|p=i' => \$port,
'community|C=s' => \$community,
'timeout|t=i' => \$timeout,
'packets' => \$packets,
'non-unicast-packets' => \$non_unicast_packets,
'help|?' => \$help)
or pod2usage(2);
pod2usage(0) if $help;
pod2usage(2) unless (defined $host);
$SIG{'ALRM'} = sub {
nagios_die('Check timed out');
};
alarm($timeout);
my ($session, $err) = Net::SNMP->session(
-hostname => $host,
-port => $port,
-community => $community
);
nagios_die($err) unless defined $session;
my $in_oid;
my $out_oid;
if ($non_unicast_packets) {
$in_oid = $in_non_uni_pkt_oid;
$out_oid = $out_non_uni_pkt_oid;
}
elsif ($packets) {
$in_oid = $in_uni_pkt_oid;
$out_oid = $out_uni_pkt_oid;
}
else {
$in_oid = $in_oct_oid;
$out_oid = $out_oct_oid;
}
my $IFACES = get_ifaces($session);
get_info($session, $in_oid, $out_oid, $IFACES);
$session->close();
my $channel = grep { $IFACES->{$_}{'name'} =~ /^ch/} keys %{ $IFACES };
my $if = grep { $IFACES->{$_}{'name'} !~ /^ch/} keys %{ $IFACES };
print "SNMP OK - $if interfaces, $channel port channel |";
foreach my $key (sort {$a <=> $b} keys %{ $IFACES }) {
printf " %s(in)=%sc; %s(out)=%sc;", $IFACES->{$key}{'name'}, $IFACES->{$key}{'in'}, $IFACES->{$key}{'name'}, $IFACES->{$key}{'out'};
}
print "\n";
exit 0;
__END__
=head1 check_snmp_switch_traffic
check_snmp_switch_traffic - Monitor switch ports via SNMP
=head1 SYNOPSIS
check_snmp_swtich_traffic --host|-H HOSTNAME [options]
=item B<Options:>
--port|-p PORT
--community|-C COMMUNITY
--timeout|-t TIMEOUT
--packets
--non-unicast-packets
--help|-?
=head1 OPTIONS
=over 8
=item B<--host|-H>
Specify the host to connect to via SNMP. This option is required.
=item B<--port|-p>
Port to connect to. If not specified it defaults to 161.
=item B<--community|-C>
SNMPv1 Community string. If not specified it defaults to "public".
=item B<--timeout|-t>
Maximum runtime in seconds of this script before returning UNKNOWN.
If not specified it defaults to 10.
=item B<--packets>
Get the counter for the send and received unicast packets.
=item B<--non-unicast-packets>
Get the counter for the send and received non unicast packets.
If B<--packets> and B<--non-unicast-packets> are given, the
B<--packets> switch is ignored.
=item B<--help|-?>
Display a help message about the available options.
=back
=head1 DESCRIPTION
B<check_snmp_switch_traffic> fetches the available ports of a switch
and queries the in and out octet counters via SNMP. It is also possible
to get the counter for unicast and non-unicast packets.
=cut
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