396 lines
10 KiB
Perl
396 lines
10 KiB
Perl
# SNMP::Info::FDP
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# Bruce Rodger
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# $Id$
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#
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# (c) 2004 Bruce Rodger, Max Baker
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# All rights reserved.
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#
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# Copyright (c) 2002,2003 Regents of the University of California
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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 notice,
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# this list of conditions and the following disclaimer in the documentation
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# 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" AND
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# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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# WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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# DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
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# ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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# (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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# LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
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# ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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# SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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package SNMP::Info::FDP;
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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::FDP::ISA = qw/SNMP::Info Exporter/;
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@SNMP::Info::FDP::EXPORT_OK = qw//;
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use vars qw/$VERSION $DEBUG %FUNCS %GLOBALS %MIBS %MUNGE $INIT/;
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$VERSION = '1.04';
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%MIBS = ( 'FOUNDRY-SN-SWITCH-GROUP-MIB' => 'snFdpGlobalRun' );
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%GLOBALS = (
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# CDP-Compatibility
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'cdp_interval' => 'snFdpGlobalMessageInterval',
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'cdp_holdtime' => 'snFdpGlobalHoldTime',
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'cdp_id' => 'snFdpGlobalDeviceId',
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#
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'fdp_run' => 'snFdpGlobalRun',
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'fdp_interval' => 'snFdpGlobalMessageInterval',
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'fdp_holdtime' => 'snFdpGlobalHoldTime',
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'fdp_id' => 'snFdpGlobalDeviceId',
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);
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%FUNCS = (
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'c_index' => 'snFdpCacheIfIndex',
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'c_proto' => 'snFdpCacheAddressType',
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'c_ip' => 'snFdpCacheAddress',
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'c_ver' => 'snFdpCacheVersion',
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'c_id' => 'snFdpCacheDeviceId',
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'c_port' => 'snFdpCacheDevicePort',
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'c_platform' => 'snFdpCachePlatform',
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'c_capabilities' => 'snFdpCacheCapabilities',
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'c_domain' => 'snFdpCacheVTPMgmtDomain',
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'c_vlan' => 'snFdpCacheNativeVLAN',
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'c_duplex' => 'snFdpCacheDuplex',
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);
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%MUNGE = (
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'c_capabilities' => \&munge_caps,
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'c_ip' => \&SNMP::Info::munge_ip
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);
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sub munge_caps {
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my $caps = shift;
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return undef unless defined $caps;
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my $bits = substr(unpack("B*",$caps),-7);
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return $bits;
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}
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sub cdp_run {
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my $fdp = shift;
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my $fdp_run = $fdp->fdp_run();
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# if fdp_run isn't implemented on device, assume FDP is on
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return $fdp_run if defined $fdp_run;
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return 1;
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}
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sub hasFDP {
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my $fdp = shift;
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my $ver = $fdp->{_version};
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#my $ver = $fdp->fdp_ver;
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# SNMP v1 clients dont have the globals
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if (defined $ver and $ver == 1){
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my $fdp_ip = $fdp->fdp_ip();
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# See if anything in fdp cache, if so we have fdp
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return 1 if (defined $fdp_ip and scalar(keys %$fdp_ip)) ;
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return undef;
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}
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return $fdp->fdp_run();
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}
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sub c_if {
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my $fdp = shift;
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# See if by some miracle Cisco implemented the fdpCacheIfIndex entry
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my $fdp_index = $fdp->fdp_index();
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return $fdp_index if defined $fdp_index;
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# Nope, didn't think so. Now we fake it.
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my $fdp_ip = $fdp->c_ip();
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unless (defined $fdp_ip){
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$fdp->error_throw("SNMP::Info::FDP:fdp_if() - Device doesn't have fdp_ip() data. Can't fake fdp_index()");
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return undef;
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}
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my %fdp_if;
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foreach my $key (keys %$fdp_ip){
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next unless defined $key;
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my $iid = $key;
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# Truncate .1 from fdp cache entry
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$iid =~ s/\.\d+$//;
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$fdp_if{$key} = $iid;
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}
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return \%fdp_if;
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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::FDP - Perl5 Interface to Foundry Discovery Protocol (FDP) using SNMP
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=head1 AUTHOR
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Bruce Rodger, Max Baker
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=head1 SYNOPSIS
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my $fdp = 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 = $fdp->class();
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print " Using device sub class : $class\n";
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$hasfdp = $fdp->hasFDP() ? 'yes' : 'no';
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# Print out a map of device ports with FDP neighbors:
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my $interfaces = $fdp->interfaces();
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my $fdp_if = $fdp->fdp_if();
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my $fdp_ip = $fdp->fdp_ip();
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my $fdp_port = $fdp->fdp_port();
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foreach my $fdp_key (keys %$fdp_ip){
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my $iid = $fdp_if->{$fdp_key};
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my $port = $interfaces->{$iid};
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my $neighbor = $fdp_ip->{$fdp_key};
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my $neighbor_port = $fdp_port->{$fdp_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::FDP is a subclass of SNMP::Info that provides an object oriented
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interface to FDP information through SNMP.
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FDP is a Layer 2 protocol that supplies topology information of
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devices that also speak FDP, mostly switches and routers. It has
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similar functionality to Cisco's CDP, and the SNMP interface is
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virtually identical. FDP is implemented in Foundry devices, including
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the Bigiron and Fastiron range.
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Create or use a device subclass that inherits this class. Do not use directly.
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Each device implements a subset of the global and cache entries.
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Check the return value to see if that data is held by the device.
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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 FOUNDRY-SN-SWITCH-GROUP-MIB
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Needs a reasonably recent MIB. Works OK with B2R07604A.mib, but doesn't
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work with B2R07600C.
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=back
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MIBs are normally distributed with each code update. Contact your vendor,
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or trawl through google...
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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 $fdp->hasFDP()
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Is FDP is active in this device?
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Accounts for SNMP version 1 devices which may have FDP but not fdp_run()
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=item $fdp->fdp_run()
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Is FDP enabled on this device?
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(B<fdpGlobalRun>)
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=item $fdp->fdp_interval()
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Interval in seconds at which FDP messages are generated.
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(B<fdpGlobalMessageInterval>)
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=item $fdp->fdp_holdtime()
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Time in seconds that FDP messages are kept.
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(B<fdpGlobalHoldTime>)
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=item $fdp->fdp_id()
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Returns FDP device ID.
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This is the device id broadcast via FDP to other devices, and is what is retrieved from remote devices with $fdp->id().
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(B<fdpGlobalDeviceId>)
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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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=head2 FDP CACHE ENTRIES
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=over
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=item $fdp->fdp_capabilities()
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Returns Device Functional Capabilities. Results are munged into an ascii
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binary string, 7 digits long, MSB. Each digit represents a bit from the
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table below.
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From L<http://www.cisco.com/univercd/cc/td/doc/product/lan/trsrb/frames.htm#18843>:
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(Bit) - Description
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=over
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=item (0x40) - Provides level 1 functionality.
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=item (0x20) - The bridge or switch does not forward IGMP Report packets on nonrouter ports.
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=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.
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=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.
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=item (0x04) - Performs level 2 source-route bridging. A source-route bridge would set both this bit and bit 0x02.
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=item (0x02) - Performs level 2 transparent bridging.
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=item (0x01) - Performs level 3 routing for at least one network layer protocol.
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=back
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Thanks to Martin Lorensen C<martin -at- lorensen.dk> for a pointer to this information.
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(B<fdpCacheCapabilities>)
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=item $fdp->fdp_domain()
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The CDP version of this returns remote VTP Management Domain as defined in CISCO-VTP-MIB::managementDomainName
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(B<fdpCacheVTPMgmtDomain>)
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=item $fdp->fdp_duplex()
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Returns the port duplex status from remote devices.
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(B<fdpCacheDuplex>)
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=item $fdp->fdp_id()
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Returns remote device id string
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(B<fdpCacheDeviceId>)
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=item $fdp->fdp_if()
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Returns the mapping to the SNMP Interface Table.
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Note that a lot devices don't implement $fdp->fdp_index(), So if it isn't around,
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we fake it.
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In order to map the fdp table entry back to the interfaces() entry, we truncate the last number
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off of it :
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# it exists, yay.
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my $fdp_index = $device->fdp_index();
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return $fdp_index if defined $fdp_index;
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# if not, let's fake it
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my $fdp_ip = $device->fdp_ip();
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my %fdp_if
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foreach my $key (keys %$fdp_ip){
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$iid = $key;
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## Truncate off .1 from fdp response
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$iid =~ s/\.\d+$//;
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$fdp_if{$key} = $iid;
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}
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return \%fdp_if;
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=item $fdp->fdp_index()
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Returns the mapping to the SNMP2 Interface table for FDP Cache Entries.
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Most devices don't implement this, so you probably want to use $fdp->fdp_if() instead.
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See fdp_if() entry.
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(B<fdpCacheIfIndex>)
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=item $fdp->fdp_ip()
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Returns remote IP address
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(B<fdpCacheAddress>)
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=item $fdp->fdp_platform()
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Returns remote platform id
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(B<fdpCachePlatform>)
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=item $fdp->fdp_port()
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Returns remote port ID
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(B<fdpDevicePort>)
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=item $fdp->fdp_proto()
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Returns remote address type received. Usually IP.
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(B<fdpCacheAddressType>)
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=item $fdp->fdp_ver()
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Returns remote hardware version
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(B<fdpCacheVersion>)
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=item $fdp->fdp_vlan()
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Returns the remote interface native VLAN.
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(B<fdpCacheNativeVLAN>)
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=back
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=cut
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