# SNMP::Info::Layer3::Enterasys - SNMP Interface to Enterasys devices
#
# Copyright (c) 2008 Eric Miller
# 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::Layer3::Enterasys;

use strict;
use warnings;
use Exporter;
use SNMP::Info::MAU;
use SNMP::Info::CDP;
use SNMP::Info::Layer3;

@SNMP::Info::Layer3::Enterasys::ISA = qw/SNMP::Info::MAU
    SNMP::Info::CDP SNMP::Info::Layer3
    Exporter/;
@SNMP::Info::Layer3::Enterasys::EXPORT_OK = qw//;

our ($VERSION, $DEBUG, %GLOBALS, %FUNCS, $INIT, %MIBS, %MUNGE);

$VERSION = '3.97';

%MIBS = (
    %SNMP::Info::Layer3::MIBS, %SNMP::Info::CDP::MIBS,
    %SNMP::Info::MAU::MIBS,
    'ENTERASYS-OIDS-MIB' => 'etsysOidDevice',
);

%GLOBALS = (
    %SNMP::Info::Layer3::GLOBALS, %SNMP::Info::CDP::GLOBALS,
    %SNMP::Info::MAU::GLOBALS,
    'mac' => 'dot1dBaseBridgeAddress',
);

%FUNCS = (
    %SNMP::Info::Layer3::FUNCS, %SNMP::Info::CDP::FUNCS,
    %SNMP::Info::MAU::FUNCS,
);

%MUNGE = (
    %SNMP::Info::Layer3::MUNGE, %SNMP::Info::CDP::MUNGE,
    %SNMP::Info::MAU::MUNGE,
);

sub model {
    my $enterasys = shift;
    my $id        = $enterasys->id();

    unless ( defined $id ) {
        print
            " SNMP::Info::Layer3::Enterasys::model() - Device does not support sysObjectID\n"
            if $enterasys->debug();
        return;
    }

    my $model = &SNMP::translateObj($id);

    $model =~ s/^etsysOidDev//i;
    $model =~ s/^etsysOidPhy//i;
    return $id unless defined $model;

    return $model;
}

sub vendor {
    return 'enterasys';
}

sub os {
    return 'enterasys';
}

sub os_ver {
    my $enterasys = shift;
    my $descr     = $enterasys->description();
    return unless defined $descr;

    if ( $descr =~ m/\bRev ([\d.]*)/ ) {
        return $1;
    }

    return;
}

# Use ifName as it is used for CDP and LLDP.
sub interfaces {
    my $enterasys = shift;
    my $partial   = shift;

    #  We need the original ifName, SUPER:: would give us a method definition
    #  in a higher class, we could use orig_ but just call the MIB leaf since
    #  that's what we really want anyway.
    return $enterasys->ifName($partial)
        || $enterasys->i_description($partial);
}

sub i_ignore {
    my $enterasys = shift;
    my $partial   = shift;

    my $interfaces = $enterasys->i_type($partial) || {};

    my %i_ignore;
    foreach my $if ( keys %$interfaces ) {
        if ( $interfaces->{$if} =~ /(rs232|tunnel|loopback|\blo\b|null)/i ) {
            $i_ignore{$if}++;
        }
    }
    return \%i_ignore;
}

sub i_duplex {
    my $enterasys = shift;
    my $partial   = shift;

    return $enterasys->mau_i_duplex($partial);
}

sub i_duplex_admin {
    my $enterasys = shift;
    my $partial   = shift;

    return $enterasys->mau_i_duplex_admin($partial);
}

#  TimeFilter implementation continuously increments when walked
#  and we may never reach the end of the table.  This behavior can be
#  modified with the "set snmp timefilter break disable" command,
#  unfortunately it is not the default.  Query with a partial value of zero
#  which means no time filter for tables with and index containing a
#  TimeFilter

sub qb_fdb_index {
    my $bridge  = shift;

    my $qb_fdb_ids = $bridge->dot1qVlanFdbId(0) || {};

    # Strip the TimeFilter
    my $vl_fdb_index = {};
    for my $fdb_entry (keys(%$qb_fdb_ids)) {
        (my $vlan = $fdb_entry) =~ s/^\d+\.//;
        $vl_fdb_index->{$qb_fdb_ids->{$fdb_entry}} = $vlan;
    }

    return $vl_fdb_index;
}

sub i_vlan_membership {
    my $bridge  = shift;
    my $partial = shift;

    # dot1qVlanCurrentTable TimeFilter index
    my $v_ports = $bridge->qb_cv_egress(0) || $bridge->qb_v_egress();

    return $bridge->_vlan_hoa($v_ports, $partial);
}

sub i_vlan_membership_untagged {
    my $bridge  = shift;
    my $partial = shift;

    # dot1qVlanCurrentTable TimeFilter index
    my $v_ports = $bridge->qb_cv_untagged(0) || $bridge->qb_v_untagged();

    return $bridge->_vlan_hoa($v_ports, $partial);
}

sub lldp_ip {
    my $enterasys = shift;
    my $partial   = shift || 0;

    return $enterasys->SUPER::lldp_ip($partial);
}

# [3564920] LLDP-MIB::lldpLocPortDesc isn't always unique,
# use LLDP-MIB::lldpLocPortId this cross references to ifName
sub lldp_if {
    my $lldp    = shift;
    my $partial = shift || 0;

    my $addr    = $lldp->lldp_rem_pid($partial) || {};
    my $i_descr = $lldp->ifName() || {};
    my %r_i_descr = reverse %$i_descr;

    my %lldp_if;
    foreach my $key ( keys %$addr ) {
        my @aOID = split( '\.', $key );
        my $port = $aOID[1];
        next unless $port;
        # Local LLDP port may not equate to ifIndex
        # Cross reference lldpLocPortId with ifName to get ifIndex
        my $lldp_desc = $lldp->lldpLocPortId($port);
        my $desc = $lldp_desc->{$port};
        # If cross reference is successful use it, otherwise stick with lldpRemLocalPortNum
        if ( exists $r_i_descr{$desc} ) {
            $port = $r_i_descr{$desc};
        }

        $lldp_if{$key} = $port;
    }
    return \%lldp_if;
}

sub lldp_port {
    my $enterasys = shift;
    my $partial   = shift || 0;

    return $enterasys->SUPER::lldp_port($partial);
}

sub lldp_id {
    my $enterasys = shift;
    my $partial   = shift || 0;

    return  $enterasys->SUPER::lldp_id($partial);
}

sub lldp_platform {
    my $enterasys = shift;
    my $partial   = shift || 0;

    return  $enterasys->SUPER::lldp_rem_sysdesc($partial);
}

1;
__END__

=head1 NAME

SNMP::Info::Layer3::Enterasys - SNMP Interface to Enterasys Network Devices

=head1 AUTHOR

Eric Miller

=head1 SYNOPSIS

 # Let SNMP::Info determine the correct subclass for you.
 my $enterasys = new SNMP::Info(
                          AutoSpecify => 1,
                          Debug       => 1,
                          DestHost    => 'myswitch',
                          Community   => 'public',
                          Version     => 2
                        )
    or die "Can't connect to DestHost.\n";

 my $class = $enterasys->class();

 print "SNMP::Info determined this device to fall under subclass : $class\n";

=head1 DESCRIPTION

Provides abstraction to the configuration information obtainable from an
Enterasys device through SNMP.

=head2 Inherited Classes

=over

=item SNMP::Info::MAU

=item SNMP::Info::CDP

=item SNMP::Info::Layer3

=back

=head2 Required MIBs

=over

=item F<ENTERASYS-OIDS-MIB>

=back

=head2 Inherited MIBs

See L<SNMP::Info::MAU/"Required MIBs"> for its MIB requirements.

See L<SNMP::Info::CDP/"Required MIBs"> for its MIB requirements.

See L<SNMP::Info::Layer3/"Required MIBs"> for its MIB requirements.

=head1 GLOBALS

These are methods that return scalar value from SNMP

=over

=item $enterasys->model()

Returns model type.  Checks $enterasys->id() against the
F<ENTERASYS-OIDS-MIB>.

=item $enterasys->vendor()

Returns enterasys

=item $enterasys->os()

Returns enterasys

=item $enterasys->os_ver()

Returns os version extracted from C<sysDescr>

=item $enterasys->mac()

Returns base mac

(C<dot1dBaseBridgeAddress>)

=back

=head2 Globals imported from SNMP::Info::MAU

See documentation in L<SNMP::Info::MAU/"GLOBALS"> for details.

=head2 Globals imported from SNMP::Info::CDP

See documentation in L<SNMP::Info::CDP/"GLOBALS"> for details.

=head2 Globals imported from SNMP::Info::Layer3

See documentation in L<SNMP::Info::Layer3/"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 $enterasys->interfaces()

Mapping between the Interface Table Index (iid) and the physical port name.

=item $enterasys->i_ignore()

Returns reference to hash.  Creates a key for each IID that should be ignored.

Currently looks for rs232, tunnel,loopback,lo,null from
$enterasys->interfaces()

=item $enterasys->i_duplex()

See documentation for mau_i_duplex() in L<SNMP::Info::MAU/"TABLE METHODS">.

=item $enterasys->i_duplex_admin()

See documentation for mau_i_duplex_admin() in
L<SNMP::Info::MAU/"TABLE METHODS">.

=back

=head2 Time Filter Table Index Overrides

The time filter C<TimeFilter> implementation continuously increments when
walked and we may never reach the end of the table.  This behavior can be
modified with the C<"set snmp timefilter break disable"> command,
unfortunately it is not the default.  These methods are overridden to
supply a partial value of zero which means no time filter.

=over

=item $enterasys->qb_fdb_index()

=item $enterasys->i_vlan_membership()

=item $enterasys->i_vlan_membership_untagged()

=item $enterasys->lldp_if()

=item $enterasys->lldp_ip()

=item $enterasys->lldp_port()

=item $enterasys->lldp_id()

=item $enterasys->lldp_platform()

=back

=head2 Table Methods imported from SNMP::Info::MAU

See documentation in L<SNMP::Info::MAU/"TABLE METHODS"> for details.

=head2 Table Methods imported from SNMP::Info::CDP

See documentation in L<SNMP::Info::CDP/"TABLE METHODS"> for details.

=head2 Table Methods imported from SNMP::Info::Layer3

See documentation in L<SNMP::Info::Layer3/"TABLE METHODS"> for details.

=cut
