/*

 * Copyright (C) 2017 Red Hat, Inc.

 *

 * Author: Nikos Mavrogiannopoulos

 *

 * This file is part of GnuTLS.

 *

 * The GnuTLS is free software; you can redistribute it and/or

 * modify it under the terms of the GNU Lesser General Public License

 * as published by the Free Software Foundation; either version 2.1 of

 * the License, or (at your option) any later version.

 *

 * This library is distributed in the hope that it will be useful, but

 * WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

 * Lesser General Public License for more details.

 *

 * You should have received a copy of the GNU Lesser General Public License

 * along with this program.  If not, see <https://www.gnu.org/licenses/>

 *

 */

#include "gnutls_int.h"

#include "handshake.h"

#include "tls13/early_data.h"

int _gnutls13_send_early_data(gnutls_session_t session)

{

  int ret;

  if (!(session->security_parameters.entity == GNUTLS_CLIENT &&

        session->internals.hsk_flags & HSK_EARLY_DATA_IN_FLIGHT))

    return 0;

  while (session->internals.early_data_presend_buffer.length > 0) {

    ret = gnutls_record_send(

      session,

      session->internals.early_data_presend_buffer.data,

      session->internals.early_data_presend_buffer.length);

    if (ret < 0)

      return gnutls_assert_val(ret);

    session->internals.early_data_presend_buffer.data += ret;

    session->internals.early_data_presend_buffer.length -= ret;

  }

  return 0;

}

int _gnutls13_send_end_of_early_data(gnutls_session_t session, unsigned again)

{

  int ret;

  mbuffer_st *bufel = NULL;

  gnutls_buffer_st buf;

  if (!(session->security_parameters.entity == GNUTLS_CLIENT &&

        session->internals.hsk_flags & HSK_EARLY_DATA_ACCEPTED))

    return 0;

  if (session->internals.flags & GNUTLS_NO_END_OF_EARLY_DATA) {

    return 0;

  }

  if (again == 0) {

    ret = _gnutls_buffer_init_handshake_mbuffer(&buf);

    if (ret < 0)

      return gnutls_assert_val(ret);

    bufel = _gnutls_buffer_to_mbuffer(&buf);

  }

  return _gnutls_send_handshake(session, bufel,

              GNUTLS_HANDSHAKE_END_OF_EARLY_DATA);

}

int _gnutls13_recv_end_of_early_data(gnutls_session_t session)

{

  int ret;

  gnutls_buffer_st buf;

  if (!(session->security_parameters.entity == GNUTLS_SERVER &&

        session->internals.hsk_flags & HSK_EARLY_DATA_ACCEPTED))

    return 0;

  if (!(session->internals.flags & GNUTLS_NO_END_OF_EARLY_DATA)) {

    ret = _gnutls_recv_handshake(

      session, GNUTLS_HANDSHAKE_END_OF_EARLY_DATA, 0, &buf);

    if (ret < 0)

      return gnutls_assert_val(ret);

    if (buf.length != 0) {

      gnutls_assert();

      ret = GNUTLS_E_RECEIVED_ILLEGAL_PARAMETER;

      goto cleanup;

    }

  }

  session->internals.hsk_flags &= ~HSK_EARLY_DATA_IN_FLIGHT;

  ret = 0;

cleanup:

  _gnutls_buffer_clear(&buf);

  return ret;

}