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nfc.c
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nfc.c
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#include <stdio.h>
#include <string.h>
#include <sys/stat.h>
#include <3ds.h>
#include <3ds/errf.h>
#include <3ds/services/nfc.h>
#include <3ds/services/apt.h>
#include "nfc.h"
#include "nfc3d/amitool.h"
#include "filepicker.h"
#include "ui.h"
#include "util2.h"
#define NFC_EMULATE 0
#define CMD_FAST_READ(pagestart, pagecount) {0x3A, pagestart, pagestart+pagecount-1}
#define CMD_READ(pagestart) {0x30, pagestart}
#define CMD_WRITE(pagestart, data) {0xA2, pagestart, data[0], data[1], data[2], data[3]}
#define CMD_AUTH(pwd) {0x1B, pwd[0], pwd[1], pwd[2], pwd[3]}
#define NTAG_PACK {0x80, 0x80, 0x00, 0x00}
#define NTAG_215_LAST_PAGE 0x86
static Result nfc_auth(u8 *PWD);
#if !NFC_EMULATE
#define DnfcStartOtherTagScanning nfcStartOtherTagScanning
#define DnfcGetTagState nfcGetTagState
#define DnfcSendTagCommand nfcSendTagCommand
#define DnfcSendTagCommand nfcSendTagCommand
#define DnfcStopScanning nfcStopScanning
#else
//emulate the calls for running in citra
static Result DnfcStartOtherTagScanning(int a, int b) {
return 0;
}
static Result DnfcGetTagState(NFC_TagState *state) {
*state = NFC_TagState_InRange;
return 0;
}
static Result DnfcSendTagCommand(u8* command, int cmdlen, u8* dest, int destlen, size_t *readsize, u64 timeout) {
//printbuf("cmd>", command, cmdlen);
svcSleepThread(200000000);
static int i = 0;
for(int x = 0; x<destlen; x++) {
if (x % 4 == 0) i++;
dest[x] = i;
}
*readsize = destlen;
return 0;
}
static void DnfcStopScanning() {
}
#endif
Result nfc_readFull(u8 *data, int datalen) {
#if NFC_EMULATE
readFile("sdmc:/linkarcheramiibo.bin", data, datalen);
return 0;
#endif
if (datalen < NTAG_PAGE_SIZE * 4) {
return -1;
}
Result ret=0;
NFC_TagState prevstate, curstate;
ret = DnfcStartOtherTagScanning(NFC_STARTSCAN_DEFAULTINPUT, 0x01);
if(R_FAILED(ret)) {
printf("StartOtherTagScanning() failed: 0x%08x.\n", (unsigned int)ret);
return ret;
}
prevstate = NFC_TagState_Uninitialized;
while (1) {
gspWaitForVBlank();
hidScanInput();
u32 kDown = hidKeysDown();
if(kDown & KEY_B) {
ret = -1;
printf("Cancelled.\n");
break;
}
ret = DnfcGetTagState(&curstate);
if(R_FAILED(ret)) {
printf("nfcGetTagState() failed: 0x%08x.\n", (unsigned int)ret);
DnfcStopScanning();
return ret;
}
if(curstate!=prevstate) {
prevstate = curstate;
if(curstate==NFC_TagState_InRange) {
uiUpdateStatus("Tag detected.");
u8 tagdata[AMIIBO_MAX_SIZE];
memset(tagdata, 0, sizeof(tagdata));
printf("Reading tag");
for(int i=0x00; i<=NTAG_215_LAST_PAGE ;i+=NTAG_FAST_READ_PAGE_COUNT) {
uiUpdateStatus("Reading.");
uiUpdateProgress(i, NTAG_215_LAST_PAGE);
u8 cmd[] = CMD_FAST_READ(i, NTAG_FAST_READ_PAGE_COUNT);
u8 cmdresult[NTAG_FAST_READ_PAGE_COUNT*NTAG_PAGE_SIZE];
//printbuf("CMD ", cmd, sizeof(cmd));
memset(cmdresult, 0, sizeof(cmdresult));
size_t resultsize = 0;
//printf("page start %x end %x\n", cmd[1], cmd[2]);
resultsize = NTAG_FAST_READ_PAGE_COUNT*NTAG_PAGE_SIZE;
ret = DnfcSendTagCommand(cmd, sizeof(cmd), cmdresult, sizeof(cmdresult), &resultsize, NFC_TIMEOUT);
if(R_FAILED(ret)) {
printf("nfcSendTagCommand() failed: 0x%08x.\n", (unsigned int)ret);
break;
}
if (resultsize < NTAG_FAST_READ_PAGE_COUNT * NTAG_PAGE_SIZE) {
printf("Read size mismatch expected %d got %d.\n", NTAG_FAST_READ_PAGE_COUNT * NTAG_PAGE_SIZE, resultsize);
ret = -1;
break;
}
int copycount = sizeof(cmdresult);
if (((i * NTAG_PAGE_SIZE) + sizeof(cmdresult)) > sizeof(tagdata))
copycount = ((i * NTAG_PAGE_SIZE) + sizeof(cmdresult)) - sizeof(tagdata);
memcpy(&tagdata[i * NTAG_PAGE_SIZE], cmdresult, copycount);
//printbuf("result", cmdresult, resultsize);
}
if (ret == 0) {
memcpy(data, tagdata, sizeof(tagdata));
//printbuf("result full ", tagdata, AMIIBO_MAX_SIZE);
}
break;
}
}
}
uiUpdateProgress(0, -1);
printf("\n");
DnfcStopScanning();
return ret;
}
Result nfc_readBlock(int pageId, u8 *data, int datalen) {
if (datalen < NTAG_BLOCK_SIZE) {
return -1;
}
if (pageId < 0 || pageId > NTAG_215_LAST_PAGE)
return -1;
Result ret=0;
memset(data, 0, datalen);
NFC_TagState prevstate, curstate;
ret = DnfcStartOtherTagScanning(NFC_STARTSCAN_DEFAULTINPUT, 0x01);
if(R_FAILED(ret)) {
printf("StartOtherTagScanning() failed.\n");
return ret;
}
prevstate = NFC_TagState_Uninitialized;
while (1) {
gspWaitForVBlank();
hidScanInput();
u32 kDown = hidKeysDown();
if(kDown & KEY_B) {
ret = -1;
printf("Cancelled.\n");
break;
}
ret = DnfcGetTagState(&curstate);
if(R_FAILED(ret))
{
printf("nfcGetTagState() failed.\n");
DnfcStopScanning();
return ret;
}
if(curstate!=prevstate) {
prevstate = curstate;
if(curstate==NFC_TagState_InRange) {
u8 cmd[] = CMD_READ(pageId);
size_t resultsize = 0;
ret = DnfcSendTagCommand(cmd, sizeof(cmd), data, datalen, &resultsize, NFC_TIMEOUT);
if(R_FAILED(ret)) {
printf("nfcSendTagCommand() failed: 0x%08x.\n", (unsigned int)ret);
break;
}
if (resultsize < NTAG_BLOCK_SIZE) {
printf("Read size mismatch expected %d got %d.\n", NTAG_BLOCK_SIZE, resultsize);
ret = -1;
break;
}
break;
}
}
}
DnfcStopScanning();
return ret;
}
static Result writePage(int pageId, u8 *data) {
//debug code:
//pageId = 0x06;
u8 cmd[] = CMD_WRITE(pageId, data);
size_t resultsize = 0;
u8 buffer[100];
int ret = DnfcSendTagCommand(cmd, sizeof(cmd), buffer, sizeof(buffer), &resultsize, NFC_TIMEOUT);
if(R_FAILED(ret)) {
printf("Writing Tag page %d failed: 0x%08x.\n", pageId, (unsigned int)ret);
} else if (resultsize >=1 && buffer[0] != 0x0A) {
printf("write page returned a NAK %d\n", buffer[0]);
}
return ret;
}
static Result writeTag(u8 *data, u8 *PWD, u8 *PACK) {
//write normal pages
int ret = 0;
int stepCount = 132;
int step = 0;
uiUpdateStatus("Writing normal pages");
uiUpdateProgress(step++, stepCount);
printf("Writing normal pages\n");
for(int pageId = 0x04; pageId <= 0x81; pageId++) {
uiUpdateProgress(step++, stepCount);
ret = writePage(pageId, &data[pageId * NTAG_PAGE_SIZE]);
if (R_FAILED(ret))
return ret;
}
printf("\n");
//write OTP
printf("Writing OTP\n");
uiUpdateStatus("Writing OTP");
uiUpdateProgress(step++, stepCount);
ret = writePage(0x03, &data[0x03 * NTAG_PAGE_SIZE]);
if (R_FAILED(ret))
return ret;
ret = nfcCmd21(); //seems to put the NFC reader into a continious mode allowing all the requests to go through one session without powering the tag down.
if(R_FAILED(ret)) {
printf("nfcCmd21 failed: 0x%08x.\n", (unsigned int)ret);
return ret;
}
//write PACK
printf("Writing PACK\n");
uiUpdateStatus("Writing PACK");
uiUpdateProgress(step++, stepCount);
ret = writePage(0x86, PACK);
if (R_FAILED(ret))
return ret;
//write PWD
printf("Writing PWD\n");
uiUpdateStatus("Writing PWD");
ret = writePage(0x85, PWD);
uiUpdateProgress(step++, stepCount);
if (R_FAILED(ret))
return ret;
uiUpdateStatus("Writing lock bits");
//write LOCK
printf("Writing lock bits");
printf(".");
uiUpdateProgress(step++, stepCount);
//tag.writePage(2, new byte[]{pages[2 * TagUtil.PAGE_SIZE], pages[(2 * TagUtil.PAGE_SIZE) + 1], (byte) 0x0F, (byte) 0xE0}); //lock bits
ret = writePage(0x02, &data[0x02 * NTAG_PAGE_SIZE]); //static lock bits
if (R_FAILED(ret))
return ret;
printf(".");
uiUpdateProgress(step++, stepCount);
u8 dynamiclock[] = {0x01, 0x00, 0x0F, 0x00}; //dynamic lock bits.
ret = writePage(0x82, dynamiclock);
if (R_FAILED(ret))
return ret;
printf(".");
uiUpdateProgress(step++, stepCount);
u8 config1[] = {0x00, 0x00, 0x00, 0x04}; //config
ret = writePage(0x83, config1);
if (R_FAILED(ret))
return ret;
printf(".");
uiUpdateProgress(step++, stepCount);
u8 config2[] = {0x5F, 0x00, 0x00, 0x00}; //config
ret = writePage(0x84, config2);
if (R_FAILED(ret))
return ret;
printf("\n");
ret = nfcCmd22(); //power down the tag
if(R_FAILED(ret)) { //not a critical error
printf("nfcCmd22 failed: 0x%08x.\n", (unsigned int)ret);
}
return 0;
}
static Result restoreTag(u8 *data, u8 *PWD) {
//write normal pages
int ret = 0;
ret = nfcCmd21(); //seems to put the NFC reader into a continious mode allowing all the requests to go through one session without powering the tag down.
if(R_FAILED(ret)) {
printf("nfcCmd21 failed: 0x%08x.\n", (unsigned int)ret);
return ret;
}
uiUpdateStatus("Authenticating");
printf("Authenticating\n");
ret = nfc_auth(PWD);
if (R_FAILED(ret))
return ret;
int stepCount = 107;
int step = 0;
uiUpdateStatus("Writing data pages");
uiUpdateProgress(step++, stepCount);
printf("Writing normal pages\n");
for(int pageId = 0x04; pageId <= 0x0C; pageId++) {
uiUpdateProgress(step++, stepCount);
ret = writePage(pageId, &data[pageId * NTAG_PAGE_SIZE]);
if (R_FAILED(ret))
return ret;
}
for(int pageId = 0x20; pageId <= 0x81; pageId++) {
uiUpdateProgress(step++, stepCount);
ret = writePage(pageId, &data[pageId * NTAG_PAGE_SIZE]);
if (R_FAILED(ret))
return ret;
}
ret = nfcCmd22(); //power down the tag
if(R_FAILED(ret)) { //not a critical error
printf("nfcCmd22 failed: 0x%08x.\n", (unsigned int)ret);
}
return 0;
}
static Result nfc_auth(u8 *PWD) {
u8 pwdcmd[] = CMD_AUTH(PWD); //auth
size_t resultsize = 0;
u8 packres[2];
int ret = DnfcSendTagCommand(pwdcmd, sizeof(pwdcmd), packres, sizeof(packres), &resultsize, NFC_TIMEOUT);
//printbuf("pack ", packres, sizeof(packres));
if(R_FAILED(ret)) {
printf("PWD command failed: 0x%08x.\n", (unsigned int)ret);
return ret;
}
if (!((packres[0] == packres[1]) && (packres[0] == 0x80))) {
printf("PWD auth failed resp %x %x", packres[0], packres[1]);
return -1;
}
return 0;
}
Result nfc_write(u8 *data, int datalen, u8 *PWD, int PWDLength, int fullWrite) {
if (datalen < NTAG_PAGE_SIZE * 0x81) return -1;
if (PWDLength != NTAG_PAGE_SIZE) return -1;
Result ret = 0;
NFC_TagState prevstate, curstate;
ret = DnfcStartOtherTagScanning(NFC_STARTSCAN_DEFAULTINPUT, 0x01);
if(R_FAILED(ret)) {
printf("StartOtherTagScanning() failed: 0x%08x.\n", (unsigned int)ret);
return ret;
}
prevstate = NFC_TagState_Uninitialized;
while (1) {
gspWaitForVBlank();
hidScanInput();
u32 kDown = hidKeysDown();
if(kDown & KEY_B) {
ret = -1;
printf("Cancelled.\n");
break;
}
ret = DnfcGetTagState(&curstate);
if(R_FAILED(ret)) {
printf("nfcGetTagState() failed: 0x%08x.\n", (unsigned int)ret);
DnfcStopScanning();
return ret;
}
if(curstate!=prevstate) {
prevstate = curstate;
if(curstate==NFC_TagState_InRange) {
u8 PACK[] = NTAG_PACK;
if (fullWrite)
ret = writeTag(data, PWD, PACK);
else
ret = restoreTag(data, PWD);
break;
}
}
}
DnfcStopScanning();
printf("\n");
return ret;
}
int nfc_init() {
Result ret = nfcInit(NFC_OpType_RawNFC);
if(R_FAILED(ret)) {
printf("nfcInit() failed: 0x%08x.\n", (unsigned int)ret);
return 0;
}
return 1;
}
void nfc_exit() {
nfcExit();
}