2009-03-06 15:16:22 +01:00
|
|
|
/*
|
|
|
|
* NDEF(NFC Data Exchange Format) routines for Wi-Fi Protected Setup
|
|
|
|
* Reference is "NFCForum-TS-NDEF_1.0 2006-07-24".
|
2012-03-05 16:15:47 +01:00
|
|
|
* Copyright (c) 2009-2012, Masashi Honma <masashi.honma@gmail.com>
|
2009-03-06 15:16:22 +01:00
|
|
|
*
|
2012-03-05 16:15:47 +01:00
|
|
|
* This software may be distributed under the terms of the BSD license.
|
|
|
|
* See README for more details.
|
2009-03-06 15:16:22 +01:00
|
|
|
*/
|
|
|
|
|
|
|
|
#include "includes.h"
|
|
|
|
#include "common.h"
|
|
|
|
#include "wps/wps.h"
|
2009-11-24 23:57:00 +01:00
|
|
|
#include "wps/wps_i.h"
|
2009-03-06 15:16:22 +01:00
|
|
|
|
|
|
|
#define FLAG_MESSAGE_BEGIN (1 << 7)
|
|
|
|
#define FLAG_MESSAGE_END (1 << 6)
|
|
|
|
#define FLAG_CHUNK (1 << 5)
|
|
|
|
#define FLAG_SHORT_RECORD (1 << 4)
|
|
|
|
#define FLAG_ID_LENGTH_PRESENT (1 << 3)
|
|
|
|
#define FLAG_TNF_RFC2046 (0x02)
|
|
|
|
|
|
|
|
struct ndef_record {
|
2012-06-27 18:51:11 +02:00
|
|
|
const u8 *type;
|
|
|
|
const u8 *id;
|
|
|
|
const u8 *payload;
|
2009-03-06 15:16:22 +01:00
|
|
|
u8 type_length;
|
|
|
|
u8 id_length;
|
|
|
|
u32 payload_length;
|
|
|
|
u32 total_length;
|
|
|
|
};
|
|
|
|
|
|
|
|
static char wifi_handover_type[] = "application/vnd.wfa.wsc";
|
|
|
|
|
2012-06-27 18:51:11 +02:00
|
|
|
static int ndef_parse_record(const u8 *data, u32 size,
|
|
|
|
struct ndef_record *record)
|
2009-03-06 15:16:22 +01:00
|
|
|
{
|
2012-06-27 18:51:11 +02:00
|
|
|
const u8 *pos = data + 1;
|
2009-03-06 15:16:22 +01:00
|
|
|
|
|
|
|
if (size < 2)
|
|
|
|
return -1;
|
|
|
|
record->type_length = *pos++;
|
|
|
|
if (data[0] & FLAG_SHORT_RECORD) {
|
|
|
|
if (size < 3)
|
|
|
|
return -1;
|
|
|
|
record->payload_length = *pos++;
|
|
|
|
} else {
|
|
|
|
if (size < 6)
|
|
|
|
return -1;
|
|
|
|
record->payload_length = ntohl(*(u32 *)pos);
|
|
|
|
pos += sizeof(u32);
|
|
|
|
}
|
|
|
|
|
|
|
|
if (data[0] & FLAG_ID_LENGTH_PRESENT) {
|
|
|
|
if ((int) size < pos - data + 1)
|
|
|
|
return -1;
|
|
|
|
record->id_length = *pos++;
|
|
|
|
} else
|
|
|
|
record->id_length = 0;
|
|
|
|
|
|
|
|
record->type = record->type_length == 0 ? NULL : pos;
|
|
|
|
pos += record->type_length;
|
|
|
|
|
|
|
|
record->id = record->id_length == 0 ? NULL : pos;
|
|
|
|
pos += record->id_length;
|
|
|
|
|
|
|
|
record->payload = record->payload_length == 0 ? NULL : pos;
|
|
|
|
pos += record->payload_length;
|
|
|
|
|
|
|
|
record->total_length = pos - data;
|
|
|
|
if (record->total_length > size)
|
|
|
|
return -1;
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
|
2012-06-27 18:51:11 +02:00
|
|
|
static struct wpabuf * ndef_parse_records(const struct wpabuf *buf,
|
2009-03-06 15:16:22 +01:00
|
|
|
int (*filter)(struct ndef_record *))
|
|
|
|
{
|
|
|
|
struct ndef_record record;
|
|
|
|
int len = wpabuf_len(buf);
|
2012-06-27 18:51:11 +02:00
|
|
|
const u8 *data = wpabuf_head(buf);
|
2009-03-06 15:16:22 +01:00
|
|
|
|
|
|
|
while (len > 0) {
|
|
|
|
if (ndef_parse_record(data, len, &record) < 0) {
|
|
|
|
wpa_printf(MSG_ERROR, "NDEF : Failed to parse");
|
|
|
|
return NULL;
|
|
|
|
}
|
|
|
|
if (filter == NULL || filter(&record))
|
|
|
|
return wpabuf_alloc_copy(record.payload,
|
|
|
|
record.payload_length);
|
|
|
|
data += record.total_length;
|
|
|
|
len -= record.total_length;
|
|
|
|
}
|
|
|
|
wpa_printf(MSG_ERROR, "NDEF : Record not found");
|
|
|
|
return NULL;
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
static struct wpabuf * ndef_build_record(u8 flags, void *type,
|
|
|
|
u8 type_length, void *id,
|
2012-06-27 17:11:46 +02:00
|
|
|
u8 id_length,
|
|
|
|
const struct wpabuf *payload)
|
2009-03-06 15:16:22 +01:00
|
|
|
{
|
|
|
|
struct wpabuf *record;
|
|
|
|
size_t total_len;
|
|
|
|
int short_record;
|
|
|
|
u8 local_flag;
|
2012-06-27 17:11:46 +02:00
|
|
|
size_t payload_length = wpabuf_len(payload);
|
2009-03-06 15:16:22 +01:00
|
|
|
|
|
|
|
short_record = payload_length < 256 ? 1 : 0;
|
|
|
|
|
|
|
|
total_len = 2; /* flag + type length */
|
|
|
|
/* payload length */
|
|
|
|
total_len += short_record ? sizeof(u8) : sizeof(u32);
|
|
|
|
if (id_length > 0)
|
|
|
|
total_len += 1;
|
|
|
|
total_len += type_length + id_length + payload_length;
|
|
|
|
record = wpabuf_alloc(total_len);
|
|
|
|
if (record == NULL) {
|
|
|
|
wpa_printf(MSG_ERROR, "NDEF : Failed to allocate "
|
|
|
|
"record for build");
|
|
|
|
return NULL;
|
|
|
|
}
|
|
|
|
|
|
|
|
local_flag = flags;
|
|
|
|
if (id_length > 0)
|
|
|
|
local_flag |= FLAG_ID_LENGTH_PRESENT;
|
|
|
|
if (short_record)
|
|
|
|
local_flag |= FLAG_SHORT_RECORD;
|
|
|
|
wpabuf_put_u8(record, local_flag);
|
|
|
|
|
|
|
|
wpabuf_put_u8(record, type_length);
|
|
|
|
|
|
|
|
if (short_record)
|
|
|
|
wpabuf_put_u8(record, payload_length);
|
|
|
|
else
|
|
|
|
wpabuf_put_be32(record, payload_length);
|
|
|
|
|
|
|
|
if (id_length > 0)
|
|
|
|
wpabuf_put_u8(record, id_length);
|
|
|
|
wpabuf_put_data(record, type, type_length);
|
|
|
|
wpabuf_put_data(record, id, id_length);
|
2012-06-27 17:11:46 +02:00
|
|
|
wpabuf_put_buf(record, payload);
|
2009-03-06 15:16:22 +01:00
|
|
|
return record;
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
static int wifi_filter(struct ndef_record *record)
|
|
|
|
{
|
|
|
|
if (record->type_length != os_strlen(wifi_handover_type))
|
|
|
|
return 0;
|
|
|
|
if (os_memcmp(record->type, wifi_handover_type,
|
|
|
|
os_strlen(wifi_handover_type)) != 0)
|
|
|
|
return 0;
|
|
|
|
return 1;
|
|
|
|
}
|
|
|
|
|
|
|
|
|
2012-06-27 18:51:11 +02:00
|
|
|
struct wpabuf * ndef_parse_wifi(const struct wpabuf *buf)
|
2009-03-06 15:16:22 +01:00
|
|
|
{
|
|
|
|
return ndef_parse_records(buf, wifi_filter);
|
|
|
|
}
|
|
|
|
|
|
|
|
|
2012-06-27 18:51:11 +02:00
|
|
|
struct wpabuf * ndef_build_wifi(const struct wpabuf *buf)
|
2009-03-06 15:16:22 +01:00
|
|
|
{
|
|
|
|
return ndef_build_record(FLAG_MESSAGE_BEGIN | FLAG_MESSAGE_END |
|
|
|
|
FLAG_TNF_RFC2046, wifi_handover_type,
|
2012-06-27 17:11:46 +02:00
|
|
|
os_strlen(wifi_handover_type), NULL, 0, buf);
|
2009-03-06 15:16:22 +01:00
|
|
|
}
|