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/* Mifare Ultralight implementation, PCD side.
*
* (C) 2005-2006 by Harald Welte <laforge@gnumonks.org>
*
*/
/*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2
* as published by the Free Software Foundation
*
* This program 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
*/
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <errno.h>
#include <librfid/rfid.h>
#include <librfid/rfid_protocol.h>
#include <librfid/rfid_layer2.h>
#include <librfid/rfid_protocol_mifare_ul.h>
#include "rfid_iso14443_common.h"
/* FIXME */
#define MIFARE_UL_READ_FWT 100
#define MIFARE_UL_WRITE_FWT 100
static int
mful_read(struct rfid_protocol_handle *ph, unsigned int page,
unsigned char *rx_data, unsigned int *rx_len)
{
unsigned char rx_buf[16];
unsigned int real_rx_len = sizeof(rx_buf);
unsigned char tx[2];
int ret;
if (page > MIFARE_UL_PAGE_MAX)
return -EINVAL;
tx[0] = MIFARE_UL_CMD_READ;
tx[1] = page & 0xff;
ret = rfid_layer2_transceive(ph->l2h, RFID_14443A_FRAME_REGULAR,
tx, sizeof(tx), rx_buf,
&real_rx_len, MIFARE_UL_READ_FWT, 0);
if (ret < 0)
return ret;
if (real_rx_len < *rx_len)
*rx_len = real_rx_len;
memcpy(rx_data, rx_buf, *rx_len);
return ret;
}
static int
mful_write(struct rfid_protocol_handle *ph, unsigned int page,
unsigned char *tx_data, unsigned int tx_len)
{
unsigned int i;
unsigned char tx[6];
unsigned char rx[10];
unsigned int rx_len = sizeof(rx);
int ret;
if (tx_len != 4 || page > MIFARE_UL_PAGE_MAX)
return -EINVAL;
tx[0] = MIFARE_UL_CMD_WRITE;
tx[1] = page & 0xff;
for (i = 0; i < 4; i++)
tx[2+i] = tx_data[i];
ret = rfid_layer2_transceive(ph->l2h, RFID_14443A_FRAME_REGULAR,
tx, sizeof(tx), rx, &rx_len,
MIFARE_UL_WRITE_FWT, 0);
if (ret < 0)
return ret;
if (rx[0] != MIFARE_UL_RESP_ACK)
return -EIO;
return ret;
}
static int
mful_getopt(struct rfid_protocol_handle *ph, int optname, void *optval,
unsigned int *optlen)
{
int ret = -EINVAL;
unsigned int *size = optval;
switch (optname) {
case RFID_OPT_PROTO_SIZE:
ret = 0;
/* we have to return the size in bytes, not bits */
*size = 512/8;
break;
}
return ret;
}
static struct rfid_protocol_handle *
mful_init(struct rfid_layer2_handle *l2h)
{
struct rfid_protocol_handle *ph;
u_int8_t atqa[2];
unsigned int atqa_len = sizeof(atqa);
if (l2h->l2->id != RFID_LAYER2_ISO14443A)
return NULL;
/* According to "Type Identification Procedure Rev. 1.3" */
rfid_layer2_getopt(l2h, RFID_OPT_14443A_ATQA,
atqa, &atqa_len);
if (atqa[0] != 0x44 || atqa[1] != 0x00)
return NULL;
/* according to "Functional Specification Rev. 3.0 */
if (l2h->uid_len != 7)
return NULL;
ph = malloc_protocol_handle(sizeof(struct rfid_protocol_handle));
return ph;
}
static int mful_fini(struct rfid_protocol_handle *ph)
{
free_protocol_handle(ph);
return 0;
}
const struct rfid_protocol rfid_protocol_mful = {
.id = RFID_PROTOCOL_MIFARE_UL,
.name = "Mifare Ultralight",
.fn = {
.init = &mful_init,
.read = &mful_read,
.write = &mful_write,
.fini = &mful_fini,
.getopt = &mful_getopt,
},
};
/* Functions below are not (yet? covered in the generic librfid api */
/* lock a certain page */
int rfid_mful_lock_page(struct rfid_protocol_handle *ph, unsigned int page)
{
unsigned char buf[4] = { 0x00, 0x00, 0x00, 0x00 };
if (ph->proto != &rfid_protocol_mful)
return -EINVAL;
if (page < 3 || page > 15)
return -EINVAL;
if (page > 8)
buf[2] = (1 << page);
else
buf[3] = (1 << (page - 8));
return mful_write(ph, MIFARE_UL_PAGE_LOCK, buf, sizeof(buf));
}
/* convenience wrapper to lock the otp page */
int rfid_mful_lock_otp(struct rfid_protocol_handle *ph)
{
return rfid_mful_lock_page(ph, MIFARE_UL_PAGE_OTP);
}
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