libnfc/src/examples/nfc-mfultool.c

/*
 
Public platform independent Near Field Communication (NFC) library
Copyright (C) 2009, Roel Verdult
 
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU Lesser 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 Lesser General Public License
along with this program.  If not, see <http://www.gnu.org/licenses/>

*/

#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <stddef.h>
#include <stdbool.h>

#include <string.h>
#include <ctype.h>

#include "libnfc.h"
#include "mifareultag.h"

static dev_info* pdi;
static tag_info ti;
static mifare_param mp;
static mifareul_tag mtDump;

bool read_card()
{
  int page;
  bool bSuccess = true;

  // these are pages of 4 bytes each; we can read 4 pages at once.
  for (page = 0; page <= 0xF;  page += 4){
      // Try to read out the data block
        if (nfc_initiator_mifare_cmd(pdi,MC_READ,page,&mp))
        {
          memcpy(mtDump.amb[page / 4].mbd.abtData, mp.mpd.abtData, 16);
        } else {
          bSuccess = false;
          break;
        }
  }
  return bSuccess;
}

bool write_card()
{
  uint32_t uiBlock = 0;
  int page;
  bool bFailure = false;

  for (page = 0x4; page <= 0xF; page++) {
      // Show if the readout went well
      if (bFailure)
      {
        printf("x");
        // When a failure occured we need to redo the anti-collision
        if (!nfc_initiator_select_tag(pdi,IM_ISO14443A_106,NULL,0,&ti))
        {
          printf("!\nError: tag was removed\n");
          return false;
        }
        bFailure = false;
      } else {
        // Skip this the first time, bFailure it means nothing (yet)
        if (uiBlock != 0)
        {
          printf(".");
        }
      }
      fflush(stdout);

      // Make sure a earlier write did not fail
      if (!bFailure)
      {
        // For the Mifare Ultralight, this write command can be used
        // in compatibility mode, which only actually writes the first 
        // page (4 bytes). The Ultralight-specific Write command only
        // writes one page at a time.
        uiBlock = page / 4;
        memcpy(mp.mpd.abtData, mtDump.amb[uiBlock].mbd.abtData + ((page % 4) * 4), 16);
        if (!nfc_initiator_mifare_cmd(pdi, MC_WRITE, page, &mp)) bFailure = true;
      }
  }
  printf("%c|\n",(bFailure)?'x':'.');
  fflush(stdout);

  return true;
}

int main(int argc, const char* argv[])
{			
  bool bReadAction;
  byte_t* pbtUID;
  FILE* pfDump;

  if (argc < 3)
  {
    printf("\n");
    printf("%s r|w <dump.mfd>\n", argv[0]);
    printf("\n");
    printf("r|w         - Perform read from or write to card\n");
    printf("<dump.mfd>  - MiFare Dump (MFD) used to write (card to MFD) or (MFD to card)\n");
    printf("\n");
    return 1;
  }

  printf("\nChecking arguments and settings\n");

  bReadAction = (tolower(*(argv[1])) == 'r');

  if (bReadAction)
  {
    memset(&mtDump,0x00,sizeof(mtDump));
  } else {
    pfDump = fopen(argv[2],"rb");

    if (pfDump == NULL)
    {
      printf("Could not open dump file: %s\n",argv[2]);
      return 1;
    }

    if (fread(&mtDump,1,sizeof(mtDump),pfDump) != sizeof(mtDump))
    {
      printf("Could not read from dump file: %s\n",argv[2]);
      fclose(pfDump);
      return 1;
    }
    fclose(pfDump);
  }
  printf("Succesful opened the dump file\n");

  // Try to open the NFC reader
  pdi = nfc_connect(NULL);
  if (pdi == INVALID_DEVICE_INFO)
  {
    printf("Error connecting NFC reader\n");
    return 1;
  }

  nfc_initiator_init(pdi);

  // Drop the field for a while
  nfc_configure(pdi,DCO_ACTIVATE_FIELD,false);

  // Let the reader only try once to find a tag
  nfc_configure(pdi,DCO_INFINITE_SELECT,false);
  nfc_configure(pdi,DCO_HANDLE_CRC,true);
  nfc_configure(pdi,DCO_HANDLE_PARITY,true);

  // Enable field so more power consuming cards can power themselves up
  nfc_configure(pdi,DCO_ACTIVATE_FIELD,true);

  printf("Connected to NFC reader: %s\n",pdi->acName);

  // Try to find a MIFARE Ultralight tag
  if (!nfc_initiator_select_tag(pdi,IM_ISO14443A_106,NULL,0,&ti))
  {
    printf("Error: no tag was found\n");
    nfc_disconnect(pdi);
    return 1;
  }

  // Test if we are dealing with a MIFARE compatible tag

  if (ti.tia.abtAtqa[1] != 0x44){
      printf("Error: tag is not a MIFARE Ultralight card\n");
    nfc_disconnect(pdi);
      return 1;
  }


  // Get the info from the current tag
  pbtUID = ti.tia.abtUid;
  printf("Found MIFARE Ultralight card with uid: %08x\n", swap_endian32(pbtUID));

  if (bReadAction)
  {
    if (read_card())
    {
      printf("Writing data to file: %s\n",argv[2]);
      fflush(stdout);
      pfDump = fopen(argv[2],"wb");
      if (pfDump == NULL)
      {
        printf("Could not open file: %s\n",argv[2]);
        return 1;
      }
      if (fwrite(&mtDump,1,sizeof(mtDump),pfDump) != sizeof(mtDump))
      {
        printf("Could not write to file: %s\n",argv[2]);
        return 1;
      }
      fclose(pfDump);
      printf("Done, all bytes dumped to file!\n");
    }
  } else {
    if (write_card())
    {
      printf("Done, all data is written to the card!\n");
    }
  }

  nfc_disconnect(pdi);

  return 0;
}