# SNMP::Info::CDP
# $Id$
#
# Changes since Version 0.7 Copyright (c) 2004 Max Baker
# All rights reserved.
#
# Copyright (c) 2002,2003 Regents of the University of California
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are met:
#
# * Redistributions of source code must retain the above copyright notice,
# this list of conditions and the following disclaimer.
# * Redistributions in binary form must reproduce the above copyright
# notice, this list of conditions and the following disclaimer in the
# documentation and/or other materials provided with the distribution.
# * Neither the name of the University of California, Santa Cruz nor the
# names of its contributors may be used to endorse or promote products
# derived from this software without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
# ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
# LIABLE FOR # ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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# CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
# POSSIBILITY OF SUCH DAMAGE.
package SNMP::Info::CDP;
use strict;
use Exporter;
use SNMP::Info;
@SNMP::Info::CDP::ISA = qw/SNMP::Info Exporter/;
@SNMP::Info::CDP::EXPORT_OK = qw//;
use vars
qw/$VERSION $DEBUG %FUNCS %GLOBALS %MIBS %MUNGE $INIT %CDP_CAPABILITIES/;
$VERSION = '3.18';
# Five data structures required by SNMP::Info
%MIBS = ( 'CISCO-CDP-MIB' => 'cdpGlobalRun' );
# Notice we dont inherit the default GLOBALS and FUNCS
# only the default MUNGE.
%GLOBALS = (
'cdp_run' => 'cdpGlobalRun',
'cdp_interval' => 'cdpGlobalMessageInterval',
'cdp_holdtime' => 'cdpGlobalHoldTime',
'cdp_gid' => 'cdpGlobalDeviceId',
);
%FUNCS = (
'cdp_index' => 'cdpCacheIfIndex',
'cdp_proto' => 'cdpCacheAddressType',
'cdp_addr' => 'cdpCacheAddress',
'cdp_ver' => 'cdpCacheVersion',
'cdp_dev_id' => 'cdpCacheDeviceId',
'cdp_port' => 'cdpCacheDevicePort',
'cdp_platform' => 'cdpCachePlatform',
'cdp_capabilities' => 'cdpCacheCapabilities',
'cdp_domain' => 'cdpCacheVTPMgmtDomain',
'cdp_vlan' => 'cdpCacheNativeVLAN',
'cdp_duplex' => 'cdpCacheDuplex',
'cdp_power' => 'cdpCachePowerConsumption',
'cdp_pri_mgmt_type'=> 'cdpCachePrimaryMgmtAddrType',
'cdp_pri_mgmt_addr'=> 'cdpCachePrimaryMgmtAddr',
'cdp_sec_mgmt_type'=> 'cdpCacheSecondaryMgmtAddrType',
'cdp_sec_mgmt_addr'=> 'cdpCacheSecondaryMgmtAddr',
);
%MUNGE = (
'cdp_capabilities' => \&SNMP::Info::munge_bits,
'cdp_platform' => \&SNMP::Info::munge_null,
'cdp_domain' => \&SNMP::Info::munge_null,
'cdp_port' => \&SNMP::Info::munge_null,
'cdp_ver' => \&SNMP::Info::munge_null,
'cdp_ip' => \&SNMP::Info::munge_ip,
'cdp_power' => \&munge_power,
);
%CDP_CAPABILITIES = (
'Router' => 0x001,
'Trans-Bridge' => 0x002,
'Source-Route-Bridge' => 0x004,
'Switch' => 0x008,
'Host' => 0x010,
'IGMP' => 0x020,
'Repeater' => 0x040,
'VoIP-Phone' => 0x080,
'Remotely-Managed-Device' => 0x100,
'Supports-STP-Dispute' => 0x200,
'Two-port Mac Relay' => 0x400,
);
sub munge_power {
my $power = shift;
my $decimal = substr( $power, -3 );
$power =~ s/$decimal$/\.$decimal/;
return $power;
}
sub hasCDP {
my $cdp = shift;
my $ver = $cdp->{_version};
# SNMP v1 clients dont have the globals
if ( defined $ver and $ver == 1 ) {
my $cdp_ip = $cdp->cdp_ip();
# See if anything in cdp cache, if so we have cdp
return 1 if ( defined $cdp_ip and scalar( keys %$cdp_ip ) );
return;
}
return $cdp->cdp_run();
}
sub cdp_if {
my $cdp = shift;
# See if by some miracle Cisco implemented the cdpCacheIfIndex entry
my $cdp_index = $cdp->cdp_index();
return $cdp_index if defined $cdp_index;
# Nope, didn't think so. Now we fake it.
my $cdp_ip = $cdp->cdp_ip();
unless ( defined $cdp_ip ) {
$cdp->error_throw(
"SNMP::Info::CDP:cdp_if() - Device doesn't have cdp_ip() data. Can't fake cdp_index()"
);
return;
}
my %cdp_if;
foreach my $key ( keys %$cdp_ip ) {
next unless defined $key;
my $iid = $key;
# Truncate .1 from cdp cache entry
$iid =~ s/\.\d+$//;
$cdp_if{$key} = $iid;
}
return \%cdp_if;
}
sub cdp_ip {
my $cdp = shift;
my $partial = shift;
my $cdp_addr = $cdp->cdp_addr($partial) || {};
my $cdp_proto = $cdp->cdp_proto($partial) || {};
my %cdp_ip;
foreach my $key ( keys %$cdp_addr ) {
my $addr = $cdp_addr->{$key};
my $proto = $cdp_proto->{$key};
next unless defined $addr;
next if ( defined $proto and $proto ne 'ip' );
my $ip = join( '.', unpack( 'C4', $addr ) );
$cdp_ip{$key} = $ip;
}
return \%cdp_ip;
}
sub cdp_cap {
my $cdp = shift;
my $partial = shift;
# Some devices return a hex-string, others return a space separated
# string, we need the raw data to determine return value and
# take appropriate action
my $cdp_caps = $cdp->cdp_capabilities_raw($partial) || {};
my %cdp_cap;
foreach my $key ( keys %$cdp_caps ) {
my $cap_raw = $cdp_caps->{$key};
next unless $cap_raw;
# Simple check, smallest single string is either Host or IGMP with a
# space added on the end for a length of 5, hex string is normally
# 4 bytes, but since only one byte was traditionally needed process
# as hex for a length of 4 or less
if ( length $cap_raw < 5 ) {
my $cap_hex = join( '',
map { sprintf "%x", $_ } unpack( 'C*', $cap_raw ) );
foreach my $capability ( keys %CDP_CAPABILITIES ) {
if ( ( hex $cap_hex ) & $CDP_CAPABILITIES{$capability} ) {
push( @{ $cdp_cap{$key} }, $capability );
}
}
}
else {
my @caps = split /\s/, $cap_raw;
push( @{ $cdp_cap{$key} }, @caps );
}
}
return \%cdp_cap;
}
sub cdp_id {
my $cdp = shift;
my $partial = shift;
my $ch = $cdp->cdp_dev_id($partial) || {};
my %cdp_id;
foreach my $key ( sort keys %$ch ) {
my $id = $ch->{$key};
next unless $id;
$id = SNMP::Info::munge_mac($id) || SNMP::Info::munge_null($id);
$cdp_id{$key} = $id;
}
return \%cdp_id;
}
1;
__END__
=head1 NAME
SNMP::Info::CDP - SNMP Interface to Cisco Discovery Protocol (CDP) using SNMP
=head1 AUTHOR
Max Baker
=head1 SYNOPSIS
my $cdp = new SNMP::Info (
AutoSpecify => 1,
Debug => 1,
DestHost => 'router',
Community => 'public',
Version => 2
);
my $class = $cdp->class();
print " Using device sub class : $class\n";
$hascdp = $cdp->hasCDP() ? 'yes' : 'no';
# Print out a map of device ports with CDP neighbors:
my $interfaces = $cdp->interfaces();
my $cdp_if = $cdp->cdp_if();
my $cdp_ip = $cdp->cdp_ip();
my $cdp_port = $cdp->cdp_port();
foreach my $cdp_key (keys %$cdp_ip){
my $iid = $cdp_if->{$cdp_key};
my $port = $interfaces->{$iid};
my $neighbor = $cdp_ip->{$cdp_key};
my $neighbor_port = $cdp_port->{$cdp_key};
print "Port : $port connected to $neighbor / $neighbor_port\n";
}
=head1 DESCRIPTION
SNMP::Info::CDP is a subclass of SNMP::Info that provides an object oriented
interface to CDP information through SNMP.
CDP is a Layer 2 protocol that supplies topology information of devices that
also speak CDP, mostly switches and routers. CDP is implemented in Cisco and
some HP devices.
Create or use a device subclass that inherits this class. Do not use
directly.
Each device implements a subset of the global and cache entries.
Check the return value to see if that data is held by the device.
=head2 Inherited Classes
None.
=head2 Required MIBs
=over
=item F<CISCO-CDP-MIB>
=back
MIBs can be found at ftp://ftp.cisco.com/pub/mibs/v2/v2.tar.gz
=head1 GLOBAL METHODS
These are methods that return scalar values from SNMP
=over
=item $cdp->hasCDP()
Is CDP is active in this device?
Accounts for SNMP version 1 devices which may have CDP but not cdp_run()
=item $cdp->cdp_run()
Is CDP enabled on this device? Note that a lot of Cisco devices that
implement CDP don't implement this value. @#%$!
(C<cdpGlobalRun>)
=item $cdp->cdp_interval()
Interval in seconds at which CDP messages are generated.
(C<cdpGlobalMessageInterval>)
=item $cdp->cdp_holdtime()
Time in seconds that CDP messages are kept.
(C<cdpGlobalHoldTime>)
=item $cdp->cdp_gid()
Returns CDP device ID.
This is the device id broadcast via CDP to other devices, and is what is
retrieved from remote devices with $cdp->id().
(C<cdpGlobalDeviceId>)
=back
=head1 TABLE METHODS
These are methods that return tables of information in the form of a reference
to a hash.
=head2 CDP CACHE ENTRIES
=over
=item $cdp->cdp_capabilities()
Returns Device Functional Capabilities. Results are munged into an ascii
binary string, MSB. Each digit represents a bit from the table below from
the CDP Capabilities Mapping to Smartport Type table within the
Cisco Small Business 200 Series Smart Switch Administration Guide,
L<http://www.cisco.com/c/en/us/support/switches/small-business-200-series-smart-switches/products-maintenance-guides-list.html>:
(Bit) - Description
=over
=item (0x400) - Two-Port MAC Relay.
=item (0x200) - CAST Phone Port / CVTA / Supports-STP-Dispute depending
upon platform.
=item (0x100) - Remotely-Managed Device.
=item (0x80) - VoIP Phone.
=item (0x40) - Provides level 1 functionality.
=item (0x20) - The bridge or switch does not forward IGMP Report packets on
non router ports.
=item (0x10) - Sends and receives packets for at least one network layer
protocol. If the device is routing the protocol, this bit should not be set.
=item (0x08) - Performs level 2 switching. The difference between this bit
and bit 0x02 is that a switch does not run the Spanning-Tree Protocol. This
device is assumed to be deployed in a physical loop-free topology.
=item (0x04) - Performs level 2 source-route bridging. A source-route bridge
would set both this bit and bit 0x02.
=item (0x02) - Performs level 2 transparent bridging.
=item (0x01) - Performs level 3 routing for at least one network layer
protocol.
=back
Thanks to Martin Lorensen for a pointer to the original information and
CPAN user Alex for updates.
(C<cdpCacheCapabilities>)
=item $cdp->cdp_domain()
Returns remote VTP Management Domain as defined in
C<CISCO-VTP-MIB::managementDomainName>
(C<cdpCacheVTPMgmtDomain>)
=item $cdp->cdp_duplex()
Returns the port duplex status from remote devices.
(C<cdpCacheDuplex>)
=item $cdp->cdp_id()
Returns remote device id string
(C<cdpCacheDeviceId>)
=item $cdp->cdp_if()
Returns the mapping to the SNMP Interface Table.
Note that a lot devices don't implement $cdp->cdp_index(), So if it isn't
around, we fake it.
In order to map the cdp table entry back to the interfaces() entry, we
truncate the last number off of it :
# it exists, yay.
my $cdp_index = $device->cdp_index();
return $cdp_index if defined $cdp_index;
# if not, let's fake it
my $cdp_ip = $device->cdp_ip();
my %cdp_if
foreach my $key (keys %$cdp_ip){
$iid = $key;
## Truncate off .1 from cdp response
$iid =~ s/\.\d+$//;
$cdp_if{$key} = $iid;
}
return \%cdp_if;
=item $cdp->cdp_index()
Returns the mapping to the SNMP2 Interface table for CDP Cache Entries.
Most devices don't implement this, so you probably want to use $cdp->cdp_if()
instead.
See cdp_if() entry.
(C<cdpCacheIfIndex>)
=item $cdp->cdp_ip()
If $cdp->cdp_proto() is supported, returns remote IPV4 address only. Otherwise
it will return all addresses.
(C<cdpCacheAddress>)
=item $cdp->cdp_addr()
Returns remote address
(C<cdpCacheAddress>)
=item $cdp->cdp_platform()
Returns remote platform id
(C<cdpCachePlatform>)
=item $cdp->cdp_port()
Returns remote port ID
(C<cdpDevicePort>)
=item $cdp->cdp_proto()
Returns remote address type received. Usually IP.
(C<cdpCacheAddressType>)
=item $cdp->cdp_ver()
Returns remote hardware version
(C<cdpCacheVersion>)
=item $cdp->cdp_vlan()
Returns the remote interface native VLAN.
(C<cdpCacheNativeVLAN>)
=item $cdp->cdp_power()
Returns the amount of power consumed by remote device in milliwatts munged
for decimal placement.
(C<cdpCachePowerConsumption>)
=item $cdp->cdp_cap()
Returns hash of arrays with each array containing the system capabilities
supported by the remote system. Possible elements in the array are
C<Router>, C<Trans-Bridge>, C<Source-Route-Bridge>, C<Switch>, C<Host>,
C<IGMP>, C<Repeater>, C<VoIP-Phone>, C<Remotely-Managed-Device>,
C<Supports-STP-Dispute>, and C<Two-port Mac Relay>.
=back
=head1 Data Munging Callback Subroutines
=over
=item $cdp->munge_power()
Inserts a decimal at the proper location.
=back
=cut