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# SNMP::Info::Layer2 - SNMP Interface to Layer2 Devices
#
# Copyright (c) 2008 Max Baker -- All changes from Version 0.7 on
#
# 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
# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
# 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::Layer2;
use strict;
use warnings;
use Exporter;
use SNMP::Info;
use SNMP::Info::Bridge;
use SNMP::Info::Entity;
use SNMP::Info::PortAccessEntity;
use SNMP::Info::PowerEthernet;
use SNMP::Info::LLDP;
use SNMP::Info::DocsisHE;
@SNMP::Info::Layer2::ISA = qw/
        SNMP::Info SNMP::Info::Bridge
        SNMP::Info::Entity
        SNMP::Info::PowerEthernet
        SNMP::Info::LLDP
        SNMP::Info::DocsisHE
        SNMP::Info::PortAccessEntity
        Exporter
/;
@SNMP::Info::Layer2::EXPORT_OK = qw//;
our ($VERSION, %GLOBALS, %MIBS, %FUNCS, %PORTSTAT, %MUNGE);
$VERSION = '3.972002';
%MIBS = (
    %SNMP::Info::MIBS,         %SNMP::Info::Bridge::MIBS,
    %SNMP::Info::Entity::MIBS, %SNMP::Info::PowerEthernet::MIBS,
    %SNMP::Info::LLDP::MIBS,   %SNMP::Info::DocsisHE::MIBS,
    %SNMP::Info::PortAccessEntity::MIBS
);
%GLOBALS = (
    %SNMP::Info::GLOBALS,
    %SNMP::Info::Bridge::GLOBALS,
    %SNMP::Info::DocsisHE::GLOBALS,
    %SNMP::Info::Entity::GLOBALS,
    %SNMP::Info::PowerEthernet::GLOBALS,
    %SNMP::Info::LLDP::GLOBALS,
    %SNMP::Info::PortAccessEntity::GLOBALS,
    'serial1' =>
        '.1.3.6.1.4.1.9.3.6.3.0',    # OLD-CISCO-CHASSIS-MIB::chassisId.0
);
%FUNCS = (
    %SNMP::Info::FUNCS,         %SNMP::Info::Bridge::FUNCS,
    %SNMP::Info::Entity::FUNCS, %SNMP::Info::PowerEthernet::FUNCS,
    %SNMP::Info::LLDP::FUNCS,   %SNMP::Info::DocsisHE::FUNCS,
    %SNMP::Info::PortAccessEntity::FUNCS
);
%MUNGE = (
    # Inherit all the built in munging
    %SNMP::Info::MUNGE,
    %SNMP::Info::Bridge::MUNGE,
    %SNMP::Info::DocsisHE::MUNGE,
    %SNMP::Info::Entity::MUNGE,
    %SNMP::Info::PowerEthernet::MUNGE,
    %SNMP::Info::LLDP::MUNGE,
    %SNMP::Info::PortAccessEntity::MUNGE,
);
# Method OverRides
# $l2->model() - Looks at sysObjectID which gives the oid of the system
#       name, contained in a proprietary MIB.
sub model {
    my $l2    = shift;
    my $id    = $l2->id();
    my $model = &SNMP::translateObj($id) || $id || '';
    # HP
    $model =~ s/^hpswitch//i;
    # Cisco
    $model =~ s/sysid$//i;
    $model =~ s/^(cisco|catalyst)//i;
    $model =~ s/^cat//i;
    return $model;
}
sub vendor {
    my $l2    = shift;
    my $model = $l2->model() || '';
    my $descr = $l2->description() || '';
    if ( $model =~ /hp/i or $descr =~ /\bhp\b/i ) {
        return 'hp';
    }
    if ( $model =~ /catalyst/i or $descr =~ /(catalyst|cisco)/i ) {
        return 'cisco';
    }
}
sub serial {
    my $l2 = shift;
    my $entity_serial = $l2->entity_derived_serial();
    if ( defined $entity_serial and $entity_serial !~ /^\s*$/ ){
        return $entity_serial;
    }
    my $serial1  = $l2->serial1();
    if ( defined $serial1 and $serial1 !~ /^\s*$/ ) {
        return $serial1;
    }
    return;
}
sub interfaces {
    my $l2      = shift;
    my $partial = shift;
    my $interfaces = $l2->i_index($partial)       || {};
    my $i_descr    = $l2->i_description($partial) || {};
    # Replace the Index with the ifDescr field.
    # Check for duplicates in ifDescr, if so uniquely identify by adding
    # ifIndex to repeated values
    my (%seen, %first_seen_as);
    foreach my $iid ( sort keys %$i_descr ) {
        my $port = $i_descr->{$iid};
        next unless defined $port;
        $port = SNMP::Info::munge_null($port);
        $port =~ s/^\s+//; $port =~ s/\s+$//;
        next unless length $port;
        if ( $seen{$port}++ ) {
            # (#320) also fixup the port this is a duplicate of
            $interfaces->{ $first_seen_as{$port} }
              = sprintf( "%s (%d)", $port, $first_seen_as{$port} );
            $interfaces->{$iid} = sprintf( "%s (%d)", $port, $iid );
        }
        else {
            $interfaces->{$iid} = $port;
            $first_seen_as{$port} = $iid;
        }
    }
    return $interfaces;
}
1;
__END__
HideShow 167 lines of Pod
=head1 NAME
SNMP::Info::Layer2 - SNMP Interface to network devices serving Layer2 only.
=head1 AUTHOR
Max Baker
=head1 SYNOPSIS
 # Let SNMP::Info determine the correct subclass for you.
 my $l2 = new SNMP::Info(
                          AutoSpecify => 1,
                          Debug       => 1,
                          DestHost    => 'myswitch',
                          Community   => 'public',
                          Version     => 2
                        )
    or die "Can't connect to DestHost.\n";
 my $class      = $l2->class();
 print "SNMP::Info determined this device to fall under subclass : $class\n";
 # Let's get some basic Port information
 my $interfaces = $l2->interfaces();
 my $i_up       = $l2->i_up();
 my $i_speed    = $l2->i_speed();
 foreach my $iid (keys %$interfaces) {
    my $port  = $interfaces->{$iid};
    my $up    = $i_up->{$iid};
    my $speed = $i_speed->{$iid}
    print "Port $port is $up. Port runs at $speed.\n";
 }
=head1 DESCRIPTION
This class is usually used as a superclass for more specific device classes
listed under SNMP::Info::Layer2::*   Please read all docs under SNMP::Info
first.
Provides abstraction to the configuration information obtainable from a
Layer2 device through SNMP.  Information is stored in a number of MIBs.
For speed or debugging purposes you can call the subclass directly, but not
after determining a more specific class using the method above.
 my $l2 = new SNMP::Info::Layer2(...);
=head2 Inherited Classes
=over
=item SNMP::Info
=item SNMP::Info::Bridge
=item SNMP::Info::DocsisHE
=item SNMP::Info::Entity
=item SNMP::Info::LLDP
=item SNMP::Info::PowerEthernet
=item SNMP::Info::PortAccessEntity
=back
=head2 Required MIBs
=over
=item Inherited Classes
MIBs required by the inherited classes listed above.
=back
MIBs can be found in netdisco-mibs package.
=head1 GLOBALS
These are methods that return scalar value from SNMP
=head2 Overrides
=over
=item $l2->model()
Cross references $l2->id() with product IDs in the
Cisco MIBs.
For HP devices, removes C<'hpswitch'> from the name
For Cisco devices, removes c<'sysid'> from the name
=item $l2->vendor()
Tries to discover the vendor from $l2->model() and $l2->description()
=item $l2->serial()
Returns a serial number if found from F<ENTITY-MIB> and F<OLD-CISCO->... MIB.
=back
=head2 Globals imported from SNMP::Info
See documentation in L<SNMP::Info/"USAGE"> for details.
=head2 Globals imported from SNMP::Info::Bridge
See documentation in L<SNMP::Info::Bridge/"GLOBALS"> for details.
=head2 Globals imported from SNMP::Info::Entity
See documentation in L<SNMP::Info::Entity/"GLOBALS"> for details.
=head2 Globals imported from SNMP::Info::LLDP
See documentation in L<SNMP::Info::LLDP/"GLOBALS"> for details.
=head2 Globals imported from SNMP::Info::PortAccessEntity
See documentation in L<SNMP::Info::PortAccessEntity/"GLOBALS"> for details.
=head1 TABLE METHODS
These are methods that return tables of information in the form of a reference
to a hash.
=head2 Overrides
=over
=item $l2->interfaces()
Creates a map between the interface identifier (iid) and the physical port
name.
Defaults to C<ifDescr> but checks and overrides with C<ifName>
=back
=head2 Table Methods imported from SNMP::Info
See documentation in L<SNMP::Info/"USAGE"> for details.
=head2 Table Methods imported from SNMP::Info::Bridge
See documentation in L<SNMP::Info::Bridge/"TABLE METHODS"> for details.
=head2 Table Methods imported from SNMP::Info::Entity
See documentation in L<SNMP::Info::Entity/"TABLE METHODS"> for details.
=head2 Table Methods imported from SNMP::Info::LLDP
See documentation in L<SNMP::Info::LLDP/"TABLE METHODS"> for details.
=head2 Table Methods imported from SNMP::Info::PortAccessEntity
See documentation in L<SNMP::Info::PortAccessEntity/"TABLE METHODS"> for details.
=cut