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/*
* Copyright (C) 2000, 2003, 2004, 2005 Free Software Foundation
*
* Author: Nikos Mavroyanopoulos
*
* This file is part of GNUTLS.
*
* The GNUTLS library 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 library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
* USA
*
*/
#include "gnutls_int.h"
#include "gnutls_errors.h"
#include "debug.h"
#include <gnutls_session_pack.h>
#define SESSION_SIZE _gnutls_session_size( session)
/**
* gnutls_session_get_data - Returns all session parameters.
* @session: is a #gnutls_session_t structure.
* @session_data: is a pointer to space to hold the session.
* @session_data_size: is the session_data's size, or it will be set by the function.
*
* Returns all session parameters, in order to support resuming.
* The client should call this, and keep the returned session, if he wants to
* resume that current version later by calling gnutls_session_set_data()
* This function must be called after a successful handshake.
*
* Resuming sessions is really useful and speedups connections after a succesful one.
**/
int gnutls_session_get_data(gnutls_session_t session,
void *session_data, size_t * session_data_size)
{
gnutls_datum_t psession;
int ret;
if (*session_data_size < SESSION_SIZE || session_data == NULL) {
*session_data_size = SESSION_SIZE;
session_data = NULL; /* return with the new session_data_size value */
}
if (session->internals.resumable == RESUME_FALSE)
return GNUTLS_E_INVALID_SESSION;
/* just return the session size */
if (session_data == NULL) {
return 0;
}
psession.data = session_data;
ret = _gnutls_session_pack(session, &psession);
if (ret < 0) {
gnutls_assert();
return ret;
}
*session_data_size = psession.size;
return 0;
}
/**
* gnutls_session_get_id - Returns session id.
* @session: is a #gnutls_session_t structure.
* @session_id: is a pointer to space to hold the session id.
* @session_id_size: is the session id's size, or it will be set by the function.
*
* Returns the current session id. This can be used if you want to check if
* the next session you tried to resume was actually resumed.
* This is because resumed sessions have the same sessionID with the
* original session.
*
* Session id is some data set by the server, that identify the current session.
* In TLS 1.0 and SSL 3.0 session id is always less than 32 bytes.
**/
int gnutls_session_get_id(gnutls_session_t session,
void *session_id, size_t * session_id_size)
{
*session_id_size = session->security_parameters.session_id_size;
/* just return the session size */
if (session_id == NULL) {
return 0;
}
memcpy(session_id, &session->security_parameters.session_id,
*session_id_size);
return 0;
}
/**
* gnutls_session_set_data - Sets all session parameters
* @session: is a #gnutls_session_t structure.
* @session_data: is a pointer to space to hold the session.
* @session_data_size: is the session's size
*
* Sets all session parameters, in order to resume a previously established
* session. The session data given must be the one returned by gnutls_session_get_data().
* This function should be called before gnutls_handshake().
*
* Keep in mind that session resuming is advisory. The server may
* choose not to resume the session, thus a full handshake will be
* performed.
*
* Returns a negative value on error.
*
**/
int gnutls_session_set_data(gnutls_session_t session,
const void *session_data,
size_t session_data_size)
{
int ret;
gnutls_datum_t psession;
psession.data = (opaque *) session_data;
psession.size = session_data_size;
if (session_data == NULL || session_data_size == 0) {
gnutls_assert();
return GNUTLS_E_INVALID_REQUEST;
}
ret = _gnutls_session_unpack(session, &psession);
if (ret < 0) {
gnutls_assert();
return ret;
}
return 0;
}
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