# Copyright 2016-2019 The OpenSSL Project Authors. All Rights Reserved.

#

# Licensed under the OpenSSL license (the "License").  You may not use

# this file except in compliance with the License.  You can obtain a copy

# in the file LICENSE in the source distribution or at

# https://www.openssl.org/source/license.html

use strict;

package TLSProxy::EncryptedExtensions;

use vars '@ISA';

push @ISA, 'TLSProxy::Message';

sub new

{

    my $class = shift;

    my ($server,

        $data,

        $records,

        $startoffset,

        $message_frag_lens) = @_;

    my $self = $class->SUPER::new(

        $server,

        TLSProxy::Message::MT_ENCRYPTED_EXTENSIONS,

        $data,

        $records,

        $startoffset,

        $message_frag_lens);

    $self->{extension_data} = "";

    return $self;

}

sub parse

{

    my $self = shift;

    my $extensions_len = unpack('n', $self->data);

    if (!defined $extensions_len) {

        $extensions_len = 0;

    }

    my $extension_data;

    if ($extensions_len != 0) {

        $extension_data = substr($self->data, 2);

        if (length($extension_data) != $extensions_len) {

            die "Invalid extension length\n";

        }

    } else {

        if (length($self->data) != 2) {

            die "Invalid extension length\n";

        }

        $extension_data = "";

    }

    my %extensions = ();

    while (length($extension_data) >= 4) {

        my ($type, $size) = unpack("nn", $extension_data);

        my $extdata = substr($extension_data, 4, $size);

        $extension_data = substr($extension_data, 4 + $size);

        $extensions{$type} = $extdata;

    }

    $self->extension_data(\%extensions);

    print "    Extensions Len:".$extensions_len."\n";

}

#Reconstruct the on-the-wire message data following changes

sub set_message_contents

{

    my $self = shift;

    my $data;

    my $extensions = "";

    foreach my $key (keys %{$self->extension_data}) {

        my $extdata = ${$self->extension_data}{$key};

        $extensions .= pack("n", $key);

        $extensions .= pack("n", length($extdata));

        $extensions .= $extdata;

    }

    $data = pack('n', length($extensions));

    $data .= $extensions;

    $self->data($data);

}

#Read/write accessors

sub extension_data

{

    my $self = shift;

    if (@_) {

        $self->{extension_data} = shift;

    }

    return $self->{extension_data};

}

sub set_extension

{

    my ($self, $ext_type, $ext_data) = @_;

    $self->{extension_data}{$ext_type} = $ext_data;

}

sub delete_extension

{

    my ($self, $ext_type) = @_;

    delete $self->{extension_data}{$ext_type};

}

1;