Net::Frame::Layer::PPPLCP - PPP Link Control Protocol layer object

   use Net::Frame::Layer::PPPLCP qw(:consts);

   # Build a layer
   my $layer = Net::Frame::Layer::PPPLCP->new(
      code        => NF_PPPLCP_CODE_ECHO_REQUEST,
      identifier  => 1,
      length      => NF_PPPLCP_HDR_LEN,
      magicNumber => 0xffffffff,
   );
   $layer->pack;

   print 'RAW: '.$layer->dump."\n";

   # Read a raw layer
   my $layer = Net::Frame::Layer::PPPLCP->new(raw => $raw);

   print $layer->print."\n";
   print 'PAYLOAD: '.unpack('H*', $layer->payload)."\n"
      if $layer->payload;

#
# $Id: PPPLCP.pm,v 1.1 2007/04/01 17:14:36 gomor Exp $
#
package Net::Frame::Layer::PPPLCP;
use strict;
use warnings;

our $VERSION = '1.00';

use Net::Frame::Layer qw(:consts);
require Exporter;
our @ISA = qw(Net::Frame::Layer Exporter);

our %EXPORT_TAGS = (
   consts => [qw(
      NF_PPPLCP_HDR_LEN
      NF_PPPLCP_CODE_ECHO_REQUEST
      NF_PPPLCP_CODE_ECHO_REPLY
   )],
);
our @EXPORT_OK = (
   @{$EXPORT_TAGS{consts}},
);

use constant NF_PPPLCP_HDR_LEN           => 8;
use constant NF_PPPLCP_CODE_ECHO_REQUEST => 0x09;
use constant NF_PPPLCP_CODE_ECHO_REPLY   => 0x0a;

our @AS = qw(
   code
   identifier
   length
   magicNumber
);
__PACKAGE__->cgBuildIndices;
__PACKAGE__->cgBuildAccessorsScalar(\@AS);

sub new {
   shift->SUPER::new(
      code        => NF_PPPLCP_CODE_ECHO_REQUEST,
      identifier  => 1,
      length      => NF_PPPLCP_HDR_LEN,
      magicNumber => 0xffffffff,
      @_,
   );
}

sub getLength { shift->length }

sub getPayloadLength { shift->getLength - NF_PPPLCP_HDR_LEN }

sub pack {
   my $self = shift;

   $self->raw($self->SUPER::pack('CCnN',
      $self->code,
      $self->identifier,
      $self->length,
      $self->magicNumber,
   )) or return undef;

   $self->raw;
}

sub unpack {
   my $self = shift;

   my ($code, $identifier, $length, $magicNumber, $payload) =
      $self->SUPER::unpack('CCnN a*', $self->raw)
         or return undef;

   $self->code($code);
   $self->identifier($identifier);
   $self->length($length);
   $self->magicNumber($magicNumber);

   $self->payload($payload);

   $self;
}

sub encapsulate { shift->nextLayer }

sub print {
   my $self = shift;

   my $l = $self->layer;
   sprintf "$l: code:0x%02x  identifier:0x%02x  length:%d  magicNumber:0x%04x",
      $self->code,
      $self->identifier,
      $self->length,
      $self->magicNumber,
   ;
}

1;

__END__