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#include <stdio.h>
#include <unistd.h>
#include <sys/timerfd.h>
#include "nfcommander.h"
#include "config.h"
#include "libyhy.h"
static int reader_fd = -1;
int init(){
char reader_version[100];
char* port = config_get("nfc", "device");
if(!port){
printf("Please configure nfc.device to the reader serial port\n");
return 1;
}
//TODO set cloexec, nonblock
printf("Opening YHY reader on %s\n", port);
reader_fd = yhy_open(port);
if(reader_fd < 0){
printf("Failed to open reader connection at %s\n", port);
return 1;
}
if(yhy_sync_read_version(reader_fd, reader_version, sizeof(reader_version)) > 0){
printf("Connected YHY reader reports firmware: %s\n", reader_version);
}
core_manage_fd(reader_fd, 1, system_reader);
return 0;
}
int handle(int fd){
if(fd == reader_fd){
printf("Unhandled data on YHY fd\n");
}
return 0;
}
uint8_t read_ntag(nfc_tag_info_t* tag){
uint8_t data[16];
size_t bytes;
//read 16 bytes starting at block 2
//[0-3] UID, lock bytes
//[4-7] CC
//[8-11] Signature
//[12-15] Data block offsets & lengths
bytes = yhy_sync_read(reader_fd, 2, data, sizeof(data));
if(bytes != 16){
//read failed, probably not a usable tag
return FLAG_TAG_LOCKED;
}
//check for NTAG signature CC bytes
if(data[4] != 0xE1 || data[5] != 0x10 || data[7]){
return FLAG_TAG_LOCKED;
}
switch(data[6]){
case 0x12:
//NTAG213
tag->bytes_available = 144;
break;
case 0x3E:
//NTAG215
tag->bytes_available = 496;
break;
case 0x6D:
//NTAG216
tag->bytes_available = 872;
break;
default:
//unknown
return FLAG_TAG_LOCKED;
}
//TODO check lock bits
//check nfcommander signature
if(data[8] != 0xCB || data[9] != 'N' || data[10] != 'F' || data[11] != 'C'){
return FLAG_TAG_UNPROGRAMMED;
}
return 0;
}
uint8_t read_mifare(nfc_tag_info_t* tag){
//TODO
return 0;
}
int scan(){
nfc_tag_info_t card = {
0
};
uint16_t atqa = 0;
uint8_t sak = 0;
uint8_t flags;
for(yhy_sync_request(reader_fd, 1, &atqa); atqa; yhy_sync_request(reader_fd, 0, &atqa)){
sak = 0;
//ATQA should normally not be used as an indicator for UID length
//However, the YHY UL_SELECT command does not seem to work after CL1 anticollision for some reason
//extended length UIDs
if(atqa & 0x00C0){
card.uid_length = yhy_sync_ulselect(reader_fd, card.uid, sizeof(card.uid));
//since we dont get either the CL2 SAK or any other method of identifying the particular type of PICC, just guess whether it's an NTAG
card.type = tag_unknown;
if(atqa == 0x0044){
card.type = tag_ntag;
card.granularity = 4;
}
else{
printf("PICC Parameters: ATQA %04X\n", atqa);
}
}
else{
card.uid_length = yhy_sync_anticoll(reader_fd, card.uid, sizeof(card.uid));
yhy_sync_select(reader_fd, card.uid, card.uid_length, &sak);
card.type = tag_unknown;
if(atqa == 0x0004 && sak == 0x08){
card.type = tag_mifare1;
card.bytes_available = 752;
card.granularity = 16;
}
else{
printf("PICC Parameters: ATQA %04X SAK %02X\n", atqa, sak);
}
}
if(reader_tag_present(0, &card) == TAG_READ_REQUESTED){
//read card data
if(card.type == tag_ntag){
flags = read_ntag(&card);
}
else if(card.type == tag_mifare1){
flags = read_mifare(&card);
}
reader_tag_present(flags, &card);
}
yhy_sync_hlta(reader_fd);
}
return 0;
}
static void __attribute__((destructor)) cleanup(){
core_manage_fd(reader_fd, 0, system_reader);
close(reader_fd);
reader_fd = -1;
}
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