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#!@@PERL@@ -w
# -*- cperl -*-
=head1 NAME
snmp__if_err_ - SNMP wildcard plugin to monitor errors on network interfaces of any networked equipment.
=head1 APPLICABLE SYSTEMS
Any SNMP capable networked computer equipment. Using a command such
as "munin-node-configure --snmp switch.langfeldt.net --snmpversion 2c
--snmpcommunity public | sh -x" should auto-detect all applicable
interfaces. On a typical switch you will get one plugin pr. ethernet
port. On a router you might get one plugin pr. VLAN interface.
=head1 CONFIGURATION
As a rule SNMP plugins need site specific configuration. The default
configuration (shown here) will only work on insecure sites/devices:
[snmp_*]
env.version 2
env.community public
In general SNMP is not very secure at all unless you use SNMP version
3 which supports authentication and privacy (encryption). But in any
case the community string for your devices should not be "public".
Please see 'perldoc Munin::Plugin::SNMP' for further configuration
information.
Specific interface names (labels) are determined via the SNMP OID for
aliases (1.3.6.1.2.1.31.1.1.1.18.*). These can be overridden via the
"alias" environment variable:
[snmp_hostname.fqdn_if_2]
env.alias WAN
The symlink name of the plugin determines the host and the switch
port. The switch port may be a number or the interface name
(e.g. "ethN.VID@ethN"). This is primarily useful on devices where
the interface number is not guaranteed to be consistent, such as is
the case with some Linux based systems.
=head1 INTERPRETATION
The graph shows a stright forward gauge of errors per second. This
graph sums all different kinds of interface errors.
=head1 MIB INFORMATION
The pluguin requires the IF-MIB, the standard IETF MIB for network
interfaces. It sums these OIDs: IF-MIB::ifInDiscards,
IF-MIB::ifInErrors, IF-MIB::ifInUnknownProtos, IF-MIB::ifOutDiscards
and IF-MIB::ifOutErrors.
=head1 MAGIC MARKERS
#%# family=snmpauto
#%# capabilities=snmpconf
=head1 BUGS
None known.
Earlier versions of this plugin only reported the ifInErrors and
ifOutErrors numbers. This does not encompas all errors on a interface
therefore the change.
=head1 AUTHORS
Copyright (C) 2004 Jimmy Olsen
Copyright (C) 2005 Dagfinn Ilmari Mannsåker
Copyright (C) 2009 Nicolai Langfeldt
=head1 LICENSE
GPLv2
=cut
use strict;
use Munin::Plugin;
use Munin::Plugin::SNMP;
my $response;
if (defined $ARGV[0] and $ARGV[0] eq "snmpconf") {
print "index 1.3.6.1.2.1.2.2.1.1.\n";
print "require 1.3.6.1.2.1.2.2.1.10. [1-9]\n"; # ifInOctets
exit 0;
}
my ($host) = Munin::Plugin::SNMP->config_session();
my $iface;
my $session = Munin::Plugin::SNMP->session();
if ($Munin::Plugin::me =~ /if_err_(\d+)$/) {
$iface = $1;
} elsif ($Munin::Plugin::me =~ /_if_err_([\w\@.-]+)$/) {
my $ifAliasContainer = "1.3.6.1.2.1.31.1.1.1.18.";
my $if_alias = $session->get_by_regex($ifAliasContainer, "^$1\$");
if (keys(%{$if_alias}) != 1) {
die "Could not determine interface number from ".$Munin::Plugin::me."\n";
}
$iface = (keys %{$if_alias})[0];
} else {
die "Could not determine interface number from ".$Munin::Plugin::me."\n";
}
my $ifEntryDescr = "1.3.6.1.2.1.2.2.1.2.$iface";
my $ifEntryAlias = "1.3.6.1.2.1.31.1.1.1.18.$iface";
my $ifStatus = "1.3.6.1.2.1.2.2.1.8.$iface";
my $ifInDiscards = "1.3.6.1.2.1.2.2.1.13.$iface";
my $ifInErrors = "1.3.6.1.2.1.2.2.1.14.$iface";
my $ifInUnknownProtos= "1.3.6.1.2.1.2.2.1.15.$iface";
my $ifOutDiscards = "1.3.6.1.2.1.2.2.1.19.$iface";
my $ifOutErrors = "1.3.6.1.2.1.2.2.1.20.$iface";
if ($ARGV[0] and $ARGV[0] eq "config") {
my ($host) = Munin::Plugin::SNMP->config_session();
print "host_name $host\n" unless $host eq 'localhost';
my $alias = $ENV{alias} ||
$session->get_single($ifEntryAlias) ||
$session->get_single($ifEntryDescr) ||
"Interface $iface";
if (! ($alias =~ /\d+/ or defined($ENV{alias})) ) {
# If there are no numbers in the $alias add the if index
$alias .=" (if $iface)";
}
my $extrainfo = '';
if (defined ($response = $session->get_single($ifStatus))) {
if ($response == 2) {
# Interface is down
$extrainfo .= ' The interface is currently down.'
}
}
# Any error is too many
my $warn = 1;
print "graph_title Interface $alias errors\n";
print "graph_order recv send\n";
print "graph_args --base 1000\n";
print "graph_vlabel Errors in (-) / out (+) per \${graph_period}\n";
print "graph_category network\n";
print "graph_info This graph shows all kinds of errors for the \"$alias\" network interface.$extrainfo\n";
print "send.info Number of unsuccessfull send/receive operations (errors) on this interface.\n";
print "recv.label recv\n";
print "recv.type DERIVE\n";
print "recv.graph no\n";
print "recv.min 0\n";
print "recv.warning ", ($warn), "\n" if defined $warn;
print "send.label errors\n";
print "send.type DERIVE\n";
print "send.negative recv\n";
print "send.min 0\n";
print "send.warning $warn\n" if defined $warn;
exit 0;
}
if (defined ($response = $session->get_single($ifStatus))) {
if ($response == 2) {
print "recv.value U\n";
print "send.value U\n";
exit 0;
}
}
my $recv = ($session->get_single($ifInErrors) || 0) +
($session->get_single($ifInDiscards) || 0) +
($session->get_single($ifInUnknownProtos) || 0);
my $send = ($session->get_single($ifOutErrors) || 0) +
($session->get_single($ifOutDiscards) || 0);
print "recv.value ", $recv, "\n";
print "send.value ", $send, "\n";
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