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/* A reverse-engineered implementation of the EasyCard data format */
/* (C) 2010 by Harald Welte <laforge@gnumonks.org>
* All Rights Reserved
*
* This program 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 3 of the License, or
* (at your option) any later version.
*
* 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 <stdint.h>
#include <fcntl.h>
#include <string.h>
#include <time.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/mman.h>
#include <netinet/in.h>
#include <nfc/nfc-types.h>
#include <nfc/mifaretag.h>
#include "easycard.h"
struct {
int fd;
unsigned long size;
mifare_tag *mft;
} global;
#define ABP_C1 0x04
#define ABP_C2 0x02
#define ABP_C3 0x01
struct acc_bits_parsed {
uint8_t block[4];
};
static void dump_acc_bits(const struct acc_bits_parsed *abp)
{
uint8_t block;
for (block = 0; block < 4; block++) {
printf("\tBlock %u: %x (%u %u %u)\n", block, abp->block[block],
abp->block[block] & ABP_C1 ? 1 : 0,
abp->block[block] & ABP_C2 ? 1 : 0,
abp->block[block] & ABP_C3 ? 1 : 0);
}
}
static void parse_acc_bits(struct acc_bits_parsed *abp, uint8_t *acc_bits)
{
uint8_t c1, c2, c3;
uint8_t block;
memset(abp, 0, sizeof(*abp));
c1 = acc_bits[1] >> 4;
c2 = acc_bits[2] & 0xf;
c3 = acc_bits[2] >> 4;
printf("C1 = %x, C2 = %x, C3 = %x\n", c1, c2, c3);
for (block = 0; block < 4; block++) {
uint8_t testbit = 1 << block;
if (c1 & testbit)
abp->block[block] |= ABP_C1;
if (c2 & testbit)
abp->block[block] |= ABP_C2;
if (c3 & testbit)
abp->block[block] |= ABP_C3;
}
}
struct easy_block2sec0 {
uint8_t unknown[6];
uint8_t timestamp[3];
uint8_t unknown2[7];
} __attribute__ ((packed));
/* storage of a transaction log record on the transponder itself */
struct easy_log_rec {
uint8_t trans_id;
uint8_t unknown;
uint8_t timestamp[3]; /* seconds since January 1st 1970 / 256 */
uint8_t trans_type;
uint16_t amount; /* transaction amount / value */
uint16_t remaining; /* remaining value on card _after_ trans */
uint8_t unknown2;
uint8_t station_code; /* MRT station code */
uint16_t reader_code; /* unique code of RFID reader */
uint8_t unknown3[2];
} __attribute__ ((packed));
static time_t easy_timestamp2time(const uint8_t *easy_ts)
{
return (easy_ts[2] << 16 | easy_ts[1] << 8 | easy_ts[0]) << 8;
}
static char tsbuf[64];
char *easy_asc_timestamp(const uint8_t *timestamp)
{
time_t t_time = easy_timestamp2time(timestamp);
struct tm *t_tm = gmtime(&t_time);
memset(tsbuf, 0, sizeof(tsbuf));
snprintf(tsbuf, sizeof(tsbuf), "%4u-%02u-%02u %02u:%02u",
t_tm->tm_year+1900, t_tm->tm_mon+1, t_tm->tm_mday,
t_tm->tm_hour, t_tm->tm_min);
return tsbuf;
}
static void dump_easy_log(const struct easy_log_rec *elr)
{
printf("%s | %02x | %10s | Paid %4u NTD | %4u NTD remaining\n",
easy_asc_timestamp(elr->timestamp),
elr->trans_id,
get_value_string(easy_tt_names, elr->trans_type),
elr->amount, elr->remaining);
switch (elr->trans_type) {
case EASY_TT_MRT_ENTER:
case EASY_TT_MRT_EXIT:
printf("\tMRT Station %s\n",
get_value_string(taipei_mrt_stn_id,
elr->station_code));
break;
}
}
static void dump_mfcl(mifare_tag *mft)
{
unsigned int sect;
mifare_block_manufacturer *manuf = &mft->amb[0].mbm;
printf("UID %x, ATQA %x\n", ntohl(*((uint32_t *) manuf->abtUID)),
ntohs(*((uint16_t *) manuf->abtATQA)));
for (sect = 0; sect < 16; sect++) {
unsigned int block_base = sect * 4;
uint8_t *access_bits = mft->amb[block_base+3].mbt.abtAccessBits;
struct acc_bits_parsed abp;
printf("Sector %02u (base: 0x%02x) Access bits: 0x%08x\n", sect,
sect*4*16, ntohl(*((uint32_t *) access_bits)));
parse_acc_bits(&abp, access_bits);
dump_acc_bits(&abp);
}
}
static void dump_easycard(mifare_tag *mft)
{
unsigned int sect;
mifare_block_manufacturer *manuf = &mft->amb[0].mbm;
struct easy_block2sec0 *b2s0 = mft->amb[4].mbd.abtData;
uint32_t uid = ntohl(*((uint32_t *) manuf->abtUID));
/* dump the header */
printf("EasyCard UID 0x%08x (%u)\n", uid, uid);
printf("Date of manufacture: %s\n",
easy_asc_timestamp(b2s0->timestamp));
/* dump the transaction log */
for (sect = 3; sect <=4; sect++) {
unsigned int block_base = sect * 4;
uint8_t *access_bits = mft->amb[block_base+3].mbt.abtAccessBits;
unsigned int i;
for (i = 0; i < 3; i++) {
void *data = mft->amb[block_base+i].mbd.abtData;
dump_easy_log(data);
}
}
}
int main(int argc, char **argv)
{
struct stat st;
global.fd = open(argv[1], O_RDONLY);
if (global.fd < 0) {
perror("open");
exit(1);
}
if (fstat(global.fd, &st) < 0) {
perror("stat");
exit(1);
}
global.size = st.st_size;
global.mft = mmap(NULL, global.size, PROT_READ, MAP_SHARED,
global.fd, 0);
if (!global.mft) {
perror("mmap");
exit(1);
}
//dump_mfcl(global.mft);
dump_easycard(global.mft);
munmap(global.mft, global.size);
close(global.fd);
exit(0);
}
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