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/*
* 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 <http://www.gnu.org/licenses/>
*
*/
/* Internal API functions to be used by extension handlers.
*/
#include "gnutls_int.h"
#include "hello_ext.h"
#include "hello_ext_lib.h"
void _gnutls_hello_ext_default_deinit(gnutls_ext_priv_data_t priv)
{
gnutls_free(priv);
}
/* When this is used, the deinitialization function must be set to default:
* _gnutls_hello_ext_default_deinit.
*
* This also prevents and errors on duplicate entries.
*/
int
_gnutls_hello_ext_set_datum(gnutls_session_t session,
extensions_t id, const gnutls_datum_t *data)
{ //REMARK: we are limiting the data size to fit in a uint16 while a datum_t uses unsigned int!
gnutls_ext_priv_data_t epriv;
if (_gnutls_hello_ext_get_priv(session, id, &epriv) >= 0)
return gnutls_assert_val(GNUTLS_E_RECEIVED_ILLEGAL_PARAMETER);
if (data->size >= UINT16_MAX)
return gnutls_assert_val(GNUTLS_E_RECEIVED_ILLEGAL_PARAMETER);
epriv = gnutls_malloc(data->size+2);
if (epriv == NULL)
return gnutls_assert_val(GNUTLS_E_MEMORY_ERROR);
_gnutls_write_uint16(data->size, epriv);
memcpy(((uint8_t*)epriv)+2, data->data, data->size);
_gnutls_hello_ext_set_priv(session, id, epriv);
return 0;
}
int
_gnutls_hello_ext_get_datum(gnutls_session_t session,
extensions_t id, gnutls_datum_t *data /* constant contents */)
{
gnutls_ext_priv_data_t epriv;
int ret;
ret = _gnutls_hello_ext_get_priv(session, id, &epriv);
if (ret < 0 || epriv == NULL)
return GNUTLS_E_REQUESTED_DATA_NOT_AVAILABLE;
data->size = _gnutls_read_uint16(epriv);
data->data = ((uint8_t*)epriv)+2;
return 0;
}
int
_gnutls_hello_ext_get_resumed_datum(gnutls_session_t session,
extensions_t id, gnutls_datum_t *data /* constant contents */)
{
gnutls_ext_priv_data_t epriv;
int ret;
ret = _gnutls_hello_ext_get_resumed_priv(session, id, &epriv);
if (ret < 0 || epriv == NULL)
return GNUTLS_E_REQUESTED_DATA_NOT_AVAILABLE;
data->size = _gnutls_read_uint16(epriv);
data->data = ((uint8_t*)epriv)+2;
return 0;
}
int
_gnutls_hello_ext_default_pack(gnutls_ext_priv_data_t epriv, gnutls_buffer_st *ps)
{
size_t size;
size = _gnutls_read_uint16(epriv);
return _gnutls_buffer_append_data(ps, epriv, size+2);
}
int
_gnutls_hello_ext_default_unpack(gnutls_buffer_st *ps, gnutls_ext_priv_data_t *epriv)
{
gnutls_datum_t data;
uint8_t *store;
int ret;
ret = _gnutls_buffer_pop_datum_prefix16(ps, &data);
if (ret < 0)
return gnutls_assert_val(ret);
store = gnutls_calloc(1, data.size+2);
if (store == NULL)
return gnutls_assert_val(GNUTLS_E_MEMORY_ERROR);
_gnutls_write_uint16(data.size, store);
memcpy(store+2, data.data, data.size);
*epriv = store;
return 0;
}
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