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/*
* Copyright (C) 2001 Nikos Mavroyanopoulos
*
* This file is part of GNUTLS.
*
* GNUTLS is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* GNUTLS 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; 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_extensions.h"
#include "gnutls_errors.h"
#include "ext_srp.h"
#include "ext_dnsname.h"
#include "ext_max_record.h"
#include "gnutls_num.h"
/* Key Exchange Section */
#define GNUTLS_EXTENSION_ENTRY(type, ext_func_recv, ext_func_send) \
{ #type, type, ext_func_recv, ext_func_send }
typedef struct {
char *name;
int type;
int (*gnutls_ext_func_recv)( GNUTLS_STATE, const opaque*, int); /* recv data */
int (*gnutls_ext_func_send)( GNUTLS_STATE, opaque**); /* send data */
} gnutls_extension_entry;
#define MAX_EXT 20 /* maximum supported extension */
static gnutls_extension_entry extensions[] = {
GNUTLS_EXTENSION_ENTRY( GNUTLS_EXTENSION_SRP, _gnutls_srp_recv_params, _gnutls_srp_send_params),
GNUTLS_EXTENSION_ENTRY( GNUTLS_EXTENSION_DNSNAME, _gnutls_name_ind_recv_params, _gnutls_name_ind_send_params),
GNUTLS_EXTENSION_ENTRY( GNUTLS_EXTENSION_MAX_RECORD_SIZE, _gnutls_max_record_recv_params, _gnutls_max_record_send_params),
{0}
};
#define GNUTLS_EXTENSION_LOOP2(b) \
gnutls_extension_entry *p; \
for(p = extensions; p->name != NULL; p++) { b ; }
#define GNUTLS_EXTENSION_LOOP(a) \
GNUTLS_EXTENSION_LOOP2( if(p->type == type) { a; break; } )
/* EXTENSION functions */
void* _gnutls_ext_func_recv(int type)
{
void* ret=NULL;
GNUTLS_EXTENSION_LOOP(ret = p->gnutls_ext_func_recv);
return ret;
}
void* _gnutls_ext_func_send(int type)
{
void* ret=NULL;
GNUTLS_EXTENSION_LOOP(ret = p->gnutls_ext_func_send);
return ret;
}
const char *_gnutls_extension_get_name(int type)
{
char *ret = NULL;
/* avoid prefix */
GNUTLS_EXTENSION_LOOP(ret = p->name + sizeof("EXTENSION_") - 1);
return ret;
}
int _gnutls_parse_extensions( GNUTLS_STATE state, const opaque* data, int data_size) {
int next, ret;
int pos=0;
uint8 type;
const opaque* sdata;
int (*ext_func_recv)( GNUTLS_STATE, const opaque*, int);
uint16 size;
if (data_size < 2) return 0;
next = READuint16( data);
pos+=2;
if (data_size < next) return 0;
do {
next--; if (next < 0) return 0;
memcpy( &type, &data[pos], 1);
pos++;
next-=2; if (next < 0) return 0;
size = READuint16(&data[pos]);
pos+=2;
sdata = &data[pos];
pos+=size;
next-=size; if (next < 0) return 0;
ext_func_recv = _gnutls_ext_func_recv(type);
if (ext_func_recv == NULL) continue;
if ( (ret=ext_func_recv( state, sdata, size)) < 0) {
gnutls_assert();
return ret;
}
} while(next > 2);
return 0;
}
int _gnutls_gen_extensions( GNUTLS_STATE state, opaque** data) {
int next, size;
uint16 pos=0;
opaque* sdata;
int (*ext_func_send)( GNUTLS_STATE, opaque**);
(*data) = gnutls_malloc(2); /* allocate size for size */
pos+=2;
next = MAX_EXT; /* maximum supported extensions */
do {
next--;
ext_func_send = _gnutls_ext_func_send(next);
if (ext_func_send == NULL) continue;
size = ext_func_send( state, &sdata);
if (size > 0) {
(*data) = gnutls_realloc( (*data), pos+size+3);
(*data)[pos++] = (uint8) next; /* set type */
WRITEuint16( size, &(*data)[pos]);
pos+=2;
memcpy( &(*data)[pos], sdata, size);
pos+=size;
gnutls_free(sdata);
}
} while(next >= 0);
size = pos;
pos-=2; /* remove the size of the size header! */
WRITEuint16( pos, (*data));
if (size==2) { /* empty */
size = 0;
gnutls_free(*data);
(*data) = NULL;
}
return size;
}
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