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/*
* Copyright (C) 2002, 2003, 2004, 2005 Free Software Foundation
*
* Author: Nikos Mavrogiannopoulos
*
* 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
* USA
*
*/
#include "gnutls_int.h"
#include "gnutls_auth_int.h"
#include "gnutls_errors.h"
#include "gnutls_num.h"
#include <ext_server_name.h>
/*
* In case of a server: if a NAME_DNS extension type is received then it stores
* into the session the value of NAME_DNS. The server may use MHD_gnutls_ext_get_server_name(),
* in order to access it.
*
* In case of a client: If a proper NAME_DNS extension type is found in the session then
* it sends the extension to the peer.
*
*/
int
MHD_gtls_server_name_recv_params (MHD_gtls_session_t session,
const opaque * data, size_t _data_size)
{
int i;
const unsigned char *p;
uint16_t len, type;
ssize_t data_size = _data_size;
int server_names = 0;
if (session->security_parameters.entity == GNUTLS_SERVER)
{
DECR_LENGTH_RET (data_size, 2, 0);
len = MHD_gtls_read_uint16 (data);
if (len != data_size)
{
/* This is unexpected packet length, but
* just ignore it, for now.
*/
MHD_gnutls_assert ();
return 0;
}
p = data + 2;
/* Count all server_names in the packet. */
while (data_size > 0)
{
DECR_LENGTH_RET (data_size, 1, 0);
p++;
DECR_LEN (data_size, 2);
len = MHD_gtls_read_uint16 (p);
p += 2;
DECR_LENGTH_RET (data_size, len, 0);
server_names++;
p += len;
}
session->security_parameters.extensions.server_names_size =
server_names;
if (server_names == 0)
return 0; /* no names found */
/* we cannot accept more server names.
*/
if (server_names > MAX_SERVER_NAME_EXTENSIONS)
server_names = MAX_SERVER_NAME_EXTENSIONS;
p = data + 2;
for (i = 0; i < server_names; i++)
{
type = *p;
p++;
len = MHD_gtls_read_uint16 (p);
p += 2;
switch (type)
{
case 0: /* NAME_DNS */
if (len <= MAX_SERVER_NAME_SIZE)
{
memcpy (session->security_parameters.
extensions.server_names[i].name, p, len);
session->security_parameters.extensions.server_names[i].
name_length = len;
session->security_parameters.extensions.server_names[i].
type = GNUTLS_NAME_DNS;
break;
}
}
/* move to next record */
p += len;
}
}
return 0;
}
/* returns data_size or a negative number on failure
*/
int
MHD_gtls_server_name_send_params (MHD_gtls_session_t session,
opaque * data, size_t _data_size)
{
int total_size = 0;
#if MHD_DEBUG_TLS
uint16_t len;
opaque *p;
unsigned i;
ssize_t data_size = _data_size;
/* this function sends the client extension data (dnsname) */
if (session->security_parameters.entity == GNUTLS_CLIENT)
{
if (session->security_parameters.extensions.server_names_size == 0)
return 0;
/* uint16_t
*/
total_size = 2;
for (i = 0;
i < session->security_parameters.extensions.server_names_size; i++)
{
/* count the total size
*/
len =
session->security_parameters.extensions.
server_names[i].name_length;
/* uint8_t + uint16_t + size
*/
total_size += 1 + 2 + len;
}
p = data;
/* UINT16: write total size of all names
*/
DECR_LENGTH_RET (data_size, 2, GNUTLS_E_SHORT_MEMORY_BUFFER);
MHD_gtls_write_uint16 (total_size - 2, p);
p += 2;
for (i = 0;
i < session->security_parameters.extensions.server_names_size; i++)
{
switch (session->security_parameters.extensions.server_names[i].
type)
{
case GNUTLS_NAME_DNS:
len =
session->security_parameters.extensions.server_names[i].
name_length;
if (len == 0)
break;
/* UINT8: type of this extension
* UINT16: size of the first name
* LEN: the actual server name.
*/
DECR_LENGTH_RET (data_size, len + 3,
GNUTLS_E_SHORT_MEMORY_BUFFER);
*p = 0; /* NAME_DNS type */
p++;
MHD_gtls_write_uint16 (len, p);
p += 2;
memcpy (p,
session->security_parameters.extensions.server_names[0].
name, len);
p += len;
break;
default:
MHD_gnutls_assert ();
return GNUTLS_E_INTERNAL_ERROR;
}
}
}
#endif
return total_size;
}
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