790 lines
22 KiB
Perl
790 lines
22 KiB
Perl
# SNMP::Info::LLDP
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# $Id$
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#
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# Copyright (c) 2008 Eric Miller
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# All rights reserved.
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#
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# Redistribution and use in source and binary forms, with or without
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# modification, are permitted provided that the following conditions are met:
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#
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# * Redistributions of source code must retain the above copyright notice,
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# this list of conditions and the following disclaimer.
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# * Redistributions in binary form must reproduce the above copyright
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# notice, this list of conditions and the following disclaimer in the
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# documentation and/or other materials provided with the distribution.
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# * Neither the name of the University of California, Santa Cruz nor the
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# names of its contributors may be used to endorse or promote products
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# derived from this software without specific prior written permission.
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#
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# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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# ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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# LIABLE FOR # ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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# CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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# POSSIBILITY OF SUCH DAMAGE.
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package SNMP::Info::LLDP;
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use strict;
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use Exporter;
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use SNMP::Info;
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@SNMP::Info::LLDP::ISA = qw/SNMP::Info Exporter/;
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@SNMP::Info::LLDP::EXPORT_OK = qw//;
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use vars qw/$VERSION %FUNCS %GLOBALS %MIBS %MUNGE/;
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$VERSION = '3.56';
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%MIBS = (
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'LLDP-MIB' => 'lldpLocSysCapEnabled',
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'LLDP-EXT-MED-MIB' => 'lldpXMedMIB',
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'LLDP-EXT-DOT1-MIB' => 'lldpXdot1MIB',
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'LLDP-EXT-DOT3-MIB' => 'lldpXdot3MIB',
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);
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%GLOBALS = (
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'lldp_sysname' => 'lldpLocSysName',
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'lldp_sysdesc' => 'lldpLocSysDesc',
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'lldp_sys_cap' => 'lldpLocSysCapEnabled',
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);
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%FUNCS = (
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# LLDP-MIB::lldpLocManAddrTable
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'lldp_lman_addr' => 'lldpLocManAddrIfId',
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# LLDP-MIB::lldpRemTable
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'lldp_rem_id_type' => 'lldpRemChassisIdSubtype',
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'lldp_rem_id' => 'lldpRemChassisId',
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'lldp_rem_pid_type' => 'lldpRemPortIdSubtype',
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'lldp_rem_pid' => 'lldpRemPortId',
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'lldp_rem_desc' => 'lldpRemPortDesc',
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'lldp_rem_sysname' => 'lldpRemSysName',
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'lldp_rem_sysdesc' => 'lldpRemSysDesc',
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'lldp_rem_sys_cap' => 'lldpRemSysCapEnabled',
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'lldp_rem_cap_spt' => 'lldpRemSysCapSupported',
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# LLDP-MIB::lldpXMedRemInventoryTable
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'lldp_rem_hw_rev' => 'lldpXMedRemHardwareRev',
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'lldp_rem_fw_rev' => 'lldpXMedRemFirmwareRev',
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'lldp_rem_sw_rev' => 'lldpXMedRemSoftwareRev',
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'lldp_rem_serial' => 'lldpXMedRemSerialNum',
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'lldp_rem_vendor' => 'lldpXMedRemMfgName',
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'lldp_rem_model' => 'lldpXMedRemModelName',
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'lldp_rem_asset' => 'lldpXMedRemAssetID',
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'lldp_rem_media_cap' => 'lldpXMedRemCapCurrent',
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'lldp_rem_media_cap_spt' => 'lldpXMedRemCapSupported',
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# LLDP-MIB::lldpRemManAddrTable
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'lldp_rman_addr' => 'lldpRemManAddrIfSubtype',
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);
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%MUNGE = (
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'lldp_sysdesc' => \&SNMP::Info::munge_null,
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'lldp_sysname' => \&SNMP::Info::munge_null,
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'lldp_rem_sysname' => \&SNMP::Info::munge_null,
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'lldp_rem_sysdesc' => \&SNMP::Info::munge_null,
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'lldp_rem_port_desc' => \&SNMP::Info::munge_null,
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'lldp_sys_cap' => \&SNMP::Info::munge_bits,
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'lldp_rem_sys_cap' => \&SNMP::Info::munge_bits,
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'lldp_rem_cap_spt' => \&SNMP::Info::munge_bits,
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'lldp_rem_hw_rev' => \&SNMP::Info::munge_null,
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'lldp_rem_fw_rev' => \&SNMP::Info::munge_null,
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'lldp_rem_sw_rev' => \&SNMP::Info::munge_null,
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'lldp_rem_serial' => \&SNMP::Info::munge_null,
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'lldp_rem_vendor' => \&SNMP::Info::munge_null,
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'lldp_rem_model' => \&SNMP::Info::munge_null,
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'lldp_rem_asset' => \&SNMP::Info::munge_null,
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'lldp_rem_media_cap' => \&SNMP::Info::munge_bits,
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'lldp_rem_media_cap_spt' => \&SNMP::Info::munge_bits,
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);
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sub hasLLDP {
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my $lldp = shift;
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# We may be have LLDP, but nothing in lldpRemoteSystemsData Tables
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# so we could be running LLDP but not return any useful information
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my $lldp_cap = $lldp->lldp_sys_cap();
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return 1 if defined $lldp_cap;
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# If the device doesn't return local system capabilities, fallback by checking if it would report neighbors
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my $lldp_rem = $lldp->lldp_rem_id() || {};
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return 1 if scalar keys %$lldp_rem;
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return;
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}
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sub lldp_if {
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my $lldp = shift;
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my $partial = shift;
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my $addr = $lldp->lldp_rem_pid($partial) || {};
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my $i_descr = $lldp->i_description() || {};
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my $i_alias = $lldp->i_alias() || {};
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my %r_i_descr = reverse %$i_descr;
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my %r_i_alias = reverse %$i_alias;
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my %lldp_if;
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foreach my $key ( keys %$addr ) {
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my @aOID = split( '\.', $key );
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my $port = $aOID[1];
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next unless $port;
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# Local LLDP port may not equate to ifIndex, see LldpPortNumber TEXTUAL-CONVENTION in LLDP-MIB.
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# Cross reference lldpLocPortDesc with ifDescr and ifAlias to get ifIndex,
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# prefer ifDescr over ifAlias because using cross ref with description is correct behavior
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# according to the LLDP-MIB. Some devices (eg H3C gear) seem to use ifAlias though.
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my $lldp_desc = $lldp->lldpLocPortDesc($port);
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my $desc = $lldp_desc->{$port};
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# If cross reference is successful use it, otherwise stick with lldpRemLocalPortNum
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if ( $desc && exists $r_i_descr{$desc} ) {
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$port = $r_i_descr{$desc};
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}
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elsif ( $desc && exists $r_i_alias{$desc} ) {
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$port = $r_i_alias{$desc};
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}
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$lldp_if{$key} = $port;
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}
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return \%lldp_if;
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}
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sub lldp_ip {
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my $lldp = shift;
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my $partial = shift;
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my $rman_addr = $lldp->lldp_rman_addr($partial) || {};
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my %lldp_ip;
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foreach my $key ( keys %$rman_addr ) {
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my ( $index, $proto, $addr ) = _lldp_addr_index($key);
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next unless defined $index;
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next unless $proto == 1;
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$lldp_ip{$index} = $addr;
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}
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return \%lldp_ip;
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}
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sub lldp_ipv6 {
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my $lldp = shift;
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my $partial = shift;
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my $rman_addr = $lldp->lldp_rman_addr($partial) || {};
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my %lldp_ipv6;
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foreach my $key ( keys %$rman_addr ) {
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my ( $index, $proto, $addr ) = _lldp_addr_index($key);
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next unless defined $index;
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next unless $proto == 2;
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$lldp_ipv6{$index} = $addr;
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}
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return \%lldp_ipv6;
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}
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sub lldp_mac {
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my $lldp = shift;
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my $partial = shift;
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my $rman_addr = $lldp->lldp_rman_addr($partial) || {};
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my %lldp_ipv6;
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foreach my $key ( keys %$rman_addr ) {
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my ( $index, $proto, $addr ) = _lldp_addr_index($key);
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next unless defined $index;
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next unless $proto == 6;
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$lldp_ipv6{$index} = $addr;
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}
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return \%lldp_ipv6;
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}
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sub lldp_addr {
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my $lldp = shift;
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my $partial = shift;
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my $rman_addr = $lldp->lldp_rman_addr($partial) || {};
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my %lldp_ip;
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foreach my $key ( keys %$rman_addr ) {
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my ( $index, $proto, $addr ) = _lldp_addr_index($key);
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next unless defined $index;
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$lldp_ip{$index} = $addr;
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}
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return \%lldp_ip;
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}
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sub lldp_port {
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my $lldp = shift;
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my $partial = shift;
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my $pdesc = $lldp->lldp_rem_desc($partial) || {};
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my $pid = $lldp->lldp_rem_pid($partial) || {};
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my $ptype = $lldp->lldp_rem_pid_type($partial) || {};
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my $desc = $lldp->lldp_rem_sysdesc($partial) || {};
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my %lldp_port;
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foreach my $key ( sort keys %$pid ) {
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my $port = $pdesc->{$key};
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my $type = $ptype->{$key};
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if ( $type and $type eq 'interfaceName' ) {
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# If the pid claims to be an interface name,
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# believe it.
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$port = $pid->{$key};
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}
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unless ($port) {
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$port = $pid->{$key};
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next unless $port;
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next unless $type;
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# May need to format other types in the future, i.e. Network address
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if ( $type =~ /mac/ ) {
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$port = join( ':',
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map { sprintf "%02x", $_ } unpack( 'C*', $port ) );
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}
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}
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# Avaya/Nortel lldpRemPortDesc doesn't match ifDescr, but we can still
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# figure out slot.port based upon lldpRemPortDesc
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if ( defined $desc->{$key}
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&& $desc->{$key}
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=~ /^Ethernet\s(?:Routing\s)?Switch\s\d|^Virtual\sServices\sPlatform\s\d/
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&& $port =~ /^(Unit\s+(\d+)\s+)?Port\s+(\d+)$/ )
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{
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$port = defined $1 ? "$2.$3" : "1.$3";
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}
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$lldp_port{$key} = $port;
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}
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return \%lldp_port;
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}
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sub lldp_id {
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my $lldp = shift;
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my $partial = shift;
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my $ch_type = $lldp->lldp_rem_id_type($partial) || {};
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my $ch = $lldp->lldp_rem_id($partial) || {};
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my %lldp_id;
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foreach my $key ( keys %$ch ) {
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my $id = $ch->{$key};
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next unless $id;
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my $type = $ch_type->{$key};
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next unless $type;
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# May need to format other types in the future
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if ( $type =~ /mac/ ) {
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$id = join( ':', map { sprintf "%02x", $_ } unpack( 'C*', $id ) );
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}
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elsif ( $type eq 'networkAddress' ) {
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if ( length( unpack( 'H*', $id ) ) == 10 ) {
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# IP address (first octet is sign, I guess)
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my @octets
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= ( map { sprintf "%02x", $_ } unpack( 'C*', $id ) )
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[ 1 .. 4 ];
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$id = join '.', map { hex($_) } @octets;
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}
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}
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$lldp_id{$key} = $id;
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}
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return \%lldp_id;
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}
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sub lldp_platform {
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my $lldp = shift;
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my $partial = shift;
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my $rid = $lldp->lldp_rem_id($partial) || {};
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my $desc = $lldp->lldp_rem_sysdesc($partial) || {};
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my $name = $lldp->lldp_rem_sysname($partial) || {};
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my %lldp_platform;
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foreach my $key ( keys %$rid ) {
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$lldp_platform{$key} = $desc->{$key} || $name->{$key};
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}
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return \%lldp_platform;
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}
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sub lldp_cap {
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my $lldp = shift;
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my $partial = shift;
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my $lldp_caps = $lldp->lldp_rem_cap_spt($partial) || {};
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# Encoded as BITS which Perl Net-SNMP implementation doesn't seem to
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# be able to enumerate for us, so we have to get it from the MIB
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# and enumerate ourselves
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my $oid = SNMP::translateObj( 'lldpRemSysCapEnabled', 0, 1 ) || '';
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my $enums = (
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( ref {} eq ref $SNMP::MIB{$oid}{'enums'} )
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? $SNMP::MIB{$oid}{'enums'}
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: {}
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);
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my %r_enums = reverse %$enums;
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my %lldp_cap;
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foreach my $key ( keys %$lldp_caps ) {
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my $cap_bits = $lldp_caps->{$key};
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next unless $cap_bits;
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my $count = 0;
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foreach my $bit ( split //, $cap_bits ) {
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if ($bit) {
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push( @{ $lldp_cap{$key} }, $r_enums{$count} );
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}
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$count++;
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}
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}
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return \%lldp_cap;
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}
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sub lldp_media_cap {
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my $lldp = shift;
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my $partial = shift;
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my $lldp_caps = $lldp->lldp_rem_media_cap_spt($partial) || {};
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# Encoded as BITS which Perl Net-SNMP implementation doesn't seem to
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# be able to enumerate for us, so we have to get it from the MIB
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# and enumerate ourselves
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my $oid = SNMP::translateObj( 'lldpXMedRemCapCurrent', 0, 1 ) || '';
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my $enums = (
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( ref {} eq ref $SNMP::MIB{$oid}{'enums'} )
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? $SNMP::MIB{$oid}{'enums'}
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: {}
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);
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my %r_enums = reverse %$enums;
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my %lldp_cap;
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foreach my $key ( keys %$lldp_caps ) {
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my $cap_bits = $lldp_caps->{$key};
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next unless $cap_bits;
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my $count = 0;
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foreach my $bit ( split //, $cap_bits ) {
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if ($bit) {
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push( @{ $lldp_cap{$key} }, $r_enums{$count} );
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}
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$count++;
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}
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}
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return \%lldp_cap;
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}
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#sub root_ip {
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# my $lldp = shift;
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#
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# my $man_addr = $lldp->lldp_lman_addr() || {};
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#
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# foreach my $key (keys %$man_addr) {
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# my @oids = split(/\./, $key);
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# my $proto = shift(@oids);
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# my $length = shift(@oids);
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# # IPv4
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# if ($proto == 1) {
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# my $addr = join('.',@oids);
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# return $addr if (defined $addr and $lldp->snmp_connect_ip($addr));
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# }
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# }
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# return;
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#}
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# Break up the lldpRemManAddrTable INDEX into common index, protocol,
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# and address.
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sub _lldp_addr_index {
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my $idx = shift;
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my @oids = split( /\./, $idx );
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my $index = join( '.', splice( @oids, 0, 3 ) );
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my $proto = shift(@oids);
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shift(@oids) if scalar @oids > 4; # $length
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# IPv4
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if ( $proto == 1 ) {
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return ( $index, $proto, join( '.', @oids ) );
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}
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# IPv6
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elsif ( $proto == 2 ) {
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return ( $index, $proto,
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join(':', unpack('(H4)*', pack('C*', @oids)) ) );
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}
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# MAC
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elsif ( $proto == 6 ) {
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return ( $index, $proto,
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join( ':', map { sprintf "%02x", $_ } @oids ) );
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}
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# TODO - Other protocols may be used as well; implement when needed?
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else {
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return;
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}
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}
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1;
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__END__
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=head1 NAME
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SNMP::Info::LLDP - SNMP Interface to the Link Layer Discovery Protocol (LLDP)
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=head1 AUTHOR
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Eric Miller
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=head1 SYNOPSIS
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my $lldp = new SNMP::Info (
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AutoSpecify => 1,
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Debug => 1,
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DestHost => 'router',
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Community => 'public',
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Version => 2
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);
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my $class = $lldp->class();
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print " Using device sub class : $class\n";
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$haslldp = $lldp->hasLLDP() ? 'yes' : 'no';
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# Print out a map of device ports with LLDP neighbors:
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my $interfaces = $lldp->interfaces();
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my $lldp_if = $lldp->lldp_if();
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my $lldp_ip = $lldp->lldp_ip();
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my $lldp_port = $lldp->lldp_port();
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foreach my $lldp_key (keys %$lldp_ip){
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my $iid = $lldp_if->{$lldp_key};
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my $port = $interfaces->{$iid};
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my $neighbor = $lldp_ip->{$lldp_key};
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my $neighbor_port = $lldp_port->{$lldp_key};
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print "Port : $port connected to $neighbor / $neighbor_port\n";
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}
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=head1 DESCRIPTION
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SNMP::Info::LLDP is a subclass of SNMP::Info that provides an object oriented
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interface to LLDP information through SNMP.
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LLDP is a Layer 2 protocol that allows a network device to advertise its
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identity and capabilities on the local network providing topology information.
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The protocol is defined in the IEEE standard 802.1AB.
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Create or use a device subclass that inherits this class. Do not use
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directly.
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=head2 Inherited Classes
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None.
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=head2 Required MIBs
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=over
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=item F<LLDP-MIB>
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=item F<LLDP-EXT-MED-MIB>
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=item F<LLDP-EXT-DOT1-MIB>
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=item F<LLDP-EXT-DOT3-MIB>
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=back
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=head1 GLOBAL METHODS
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These are methods that return scalar values from SNMP
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=over
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=item $lldp->hasLLDP()
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Is LLDP is active in this device?
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Note: LLDP may be active, but nothing in C<lldpRemoteSystemsData> Tables so
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the device would not return any useful topology information.
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=item $lldp->lldp_sysname()
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The string value used to identify the system name of the local system. If the
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local agent supports IETF RFC 3418, C<lldpLocSysName> object should have the
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same value of C<sysName> object.
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Nulls are removed before the value is returned.
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(C<lldpLocSysName>)
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=item $lldp->lldp_sysdesc()
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The string value used to identify the system description of the local system.
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If the local agent supports IETF RFC 3418, C<lldpLocSysDesc> object should
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have the same value of C<sysDesc> object.
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Nulls are removed before the value is returned.
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(C<lldpLocSysDesc>)
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=item $lldp->lldp_sys_cap()
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Returns which system capabilities are enabled on the local system. Results
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are munged into an ascii binary string, LSB. Each digit represents a bit
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from the table below:
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=over
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=item Bit 'other(0)' indicates that the system has capabilities other than
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those listed below.
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=item Bit 'repeater(1)' indicates that the system has repeater capability.
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=item Bit 'bridge(2)' indicates that the system has bridge capability.
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=item Bit 'wlanAccessPoint(3)' indicates that the system has WLAN access
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point capability.
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=item Bit 'router(4)' indicates that the system has router capability.
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=item Bit 'telephone(5)' indicates that the system has telephone capability.
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=item Bit 'docsisCableDevice(6)' indicates that the system has DOCSIS Cable
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Device capability (IETF RFC 2669 & 2670).
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=item Bit 'stationOnly(7)' indicates that the system has only station
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capability and nothing else."
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=back
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(C<lldpLocSysCapEnabled>)
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=back
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=head1 TABLE METHODS
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These are methods that return tables of information in the form of a reference
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to a hash.
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=over
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=item $lldp->lldp_id()
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Returns the string value used to identify the chassis component associated
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with the remote system.
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(C<lldpRemChassisId>)
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=item $lldp->lldp_if()
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Returns the mapping to the SNMP Interface Table. Tries to cross reference
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(C<lldpLocPortDesc>) with (C<ifDescr>) and (C<ifAlias>) to get (C<ifIndex>),
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if unable defaults to (C<lldpRemLocalPortNum>).
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=item $lldp->lldp_ip()
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Returns remote IPv4 address. Returns for all other address types, use
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lldp_addr if you want any return address type.
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=item $lldp->lldp_ipv6()
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Returns remote IPv6 address, if known. Returns for all other address types,
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use lldp_addr if you don't care about return address type.
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=item $lldp->lldp_mac()
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Returns remote (management) MAC address, if known. Returns for all other
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address types, use lldp_addr if you don't care about return address type.
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=item $lldp->lldp_addr()
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Returns remote address. Type may be any IANA Address Family Number.
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Currently only returns IPv4, IPv6 or MAC addresses. If the remote device
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returns more than one address type, this method will give only one. Which one
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is returned is decided by chance, phase of the moon and Perl hash ordering.
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Use lldp_mac, lldp_ip or lldp_ipv6 if you want a specific address type.
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=item $lldp->lldp_port()
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Returns remote port ID
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=item $lldp->lldp_platform()
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Tries to return something useful from C<lldp_rem_sysdesc()> or
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C<lldp_rem_sysname()>.
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=item $lldp->lldp_cap()
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Returns hash of arrays with each array containing the system capabilities
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supported by the remote system. Possible elements in the array are
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enumerated from C<LldpSystemCapabilitiesMap>.
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=item $lldp->lldp_media_cap()
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Returns hash of arrays with each array containing the media capabilities
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supported by the remote system. Possible elements in the array are
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enumerated from C<LldpXMedCapabilities>.
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=back
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=head2 LLDP Remote Table (C<lldpRemTable>)
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=over
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=item $lldp->lldp_rem_id_type()
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Returns the type of encoding used to identify the chassis associated with
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the remote system.
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(C<lldpRemChassisIdSubtype>)
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=item $lldp->lldp_rem_id()
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Returns the string value used to identify the chassis component associated
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with the remote system.
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(C<lldpRemChassisId>)
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=item $lldp->lldp_rem_pid_type()
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Returns the type of port identifier encoding used in the associated
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C<lldpRemPortId> object.
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(C<lldpRemPortIdSubtype>)
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=item $lldp->lldp_rem_pid()
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Returns the string value used to identify the port component associated with
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the remote system.
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(C<lldpRemPortId>)
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=item $lldp->lldp_rem_desc()
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Returns the string value used to identify the description of the given port
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associated with the remote system.
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Nulls are removed before the value is returned.
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(C<lldpRemPortDesc>)
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=item $lldp->lldp_rem_sysname()
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Returns the string value used to identify the system name of the remote
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system.
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Nulls are removed before the value is returned.
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(C<lldpRemSysName>)
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=item $lldp->lldp_rem_sysdesc()
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Returns the string value used to identify the system description of the
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remote system.
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Nulls are removed before the value is returned.
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(C<lldpRemSysDesc>)
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=item $lldp->lldp_rem_hw_rev()
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Returns the string value used to identify the hardware revision of the
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remote system. Nulls are removed before the value is returned.
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(C<lldpXMedRemHardwareRev>)
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=item $lldp->lldp_rem_fw_rev()
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Returns the string value used to identify the firmware revision of the
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remote system. Nulls are removed before the value is returned.
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(C<lldpXMedRemHardwareRev>)
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=item $lldp->lldp_rem_sw_rev()
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Returns the string value used to identify the software revision of the
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remote system. Nulls are removed before the value is returned.
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(C<lldpXMedRemSoftwareRev>)
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=item $lldp->lldp_rem_serial()
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Returns the string value used to identify the serial number of the
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remote system. Nulls are removed before the value is returned.
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(C<lldpXMedRemSerialNum>)
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=item $lldp->lldp_rem_vendor()
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Returns the string value used to identify the manufacturer of the
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remote system. Nulls are removed before the value is returned.
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(C<lldpXMedRemMfgName>)
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=item $lldp->lldp_rem_asset()
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Returns the string value used to identify the asset number of the
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remote system. Nulls are removed before the value is returned.
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(C<lldpXMedRemAssetID>)
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=item $lldp->lldp_rem_model()
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Returns the string value used to identify the model of the
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remote system. Nulls are removed before the value is returned.
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(C<lldpXMedRemModelName>)
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=item $lldp->lldp_rem_media_cap_spt()
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Returns which media capabilities are supported on the remote system. Results
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are munged into an ascii binary string, LSB.
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=item $lldp->lldp_rem_media_cap()
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Returns which media capabilities are enabled on the remote system. Results
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are munged into an ascii binary string, LSB.
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=item $lldp->lldp_rem_sys_cap()
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Returns which system capabilities are enabled on the remote system. Results
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are munged into an ascii binary string, LSB. Each digit represents a bit
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from the table below:
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=over
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=item Bit 'other(0)' indicates that the system has capabilities other than
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those listed below.
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=item Bit 'repeater(1)' indicates that the system has repeater capability.
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=item Bit 'bridge(2)' indicates that the system has bridge capability.
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=item Bit 'wlanAccessPoint(3)' indicates that the system has WLAN access
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point capability.
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=item Bit 'router(4)' indicates that the system has router capability.
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=item Bit 'telephone(5)' indicates that the system has telephone capability.
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=item Bit 'docsisCableDevice(6)' indicates that the system has DOCSIS Cable
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Device capability (IETF RFC 2669 & 2670).
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=item Bit 'stationOnly(7)' indicates that the system has only station
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capability and nothing else."
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=back
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(C<lldpRemSysCapEnabled>)
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=back
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=cut
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