proxmark3/client/cmdlfpcf7931.c

//-----------------------------------------------------------------------------
// Copyright (C) 2012 Chalk <chalk.secu at gmail.com>
//               2015 Dake <thomas.cayrou at gmail.com>

// This code is licensed to you under the terms of the GNU GPL, version 2 or,
// at your option, any later version. See the LICENSE.txt file for the text of
// the license.
//-----------------------------------------------------------------------------
// Low frequency PCF7931 commands
//-----------------------------------------------------------------------------

#include <stdio.h>
#include <string.h>
#include "proxmark3.h"
#include "ui.h"
#include "graph.h"
#include "cmdparser.h"
#include "cmddata.h"
#include "cmdmain.h"
#include "cmdlf.h"
#include "cmdlfpcf7931.h"

static int CmdHelp(const char *Cmd);

struct pcf7931_config configPcf = {{0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF},17500,{0,0}};

int CmdLFPCF7931Read(const char *Cmd)
{
  UsbCommand c = {CMD_PCF7931_READ};
  SendCommand(&c);
  UsbCommand resp;
  WaitForResponse(CMD_ACK,&resp);
  return 0;
}

int CmdLFPCF7931Config(const char *Cmd)
{ 
  int res = 0;
  res = sscanf(Cmd, "%02x %02x %02x %02x %02x %02x %02x %d %d %d", &configPcf.password[0], &configPcf.password[1], &configPcf.password[2], &configPcf.password[3], &configPcf.password[4], &configPcf.password[5], &configPcf.password[6], &configPcf.init_delay, &configPcf.offset[0], &configPcf.offset[1]);

  if (res >= 7 || res < 1){
      if(res == 7) configPcf.init_delay = 17500; //default value
      
      if(res<=8){
        configPcf.offset[0] = -10; //default value
        configPcf.offset[1] = 30; //default value
      }
     
      if(res < 1){
         PrintAndLog("Usage: <password byte 1 (in hex, lsb first)> <password byte 2  (in hex, lsb first)> [...] <password byte 7  (in hex, lsb first)> <tag initialization delay (in us)> <optional : offset on the low pulses width (in us)> <optional : offset on the low pulses position (in us)>");
         PrintAndLog("The time offsets could be usefull to correct slew rate generated by the antenna.");
      }

      PrintAndLog("Current configuration :");
      PrintAndLog("Password (LSB first on each byte) : %02x %02x %02x %02x %02x %02x %02x", configPcf.password[0], configPcf.password[1], configPcf.password[2], configPcf.password[3], configPcf.password[4], configPcf.password[5], configPcf.password[6]);
      PrintAndLog("Tag initialization delay : %d us", configPcf.init_delay);
      PrintAndLog("Offsets : %d us on the low pulses width, %d us on the low pulses positions", configPcf.offset[0], configPcf.offset[1]);

      return 0;
  }

  //default values
  configPcf.password[0] = 0xFF;  
  configPcf.password[1] = 0xFF;  
  configPcf.password[2] = 0xFF;  
  configPcf.password[3] = 0xFF;  
  configPcf.password[4] = 0xFF;  
  configPcf.password[5] = 0xFF;  
  configPcf.password[6] = 0xFF;

  configPcf.init_delay = 17500;
  configPcf.offset[0] = 0; 
  configPcf.offset[1] = 0; 

  PrintAndLog("Incorrect format");
  PrintAndLog("Examples of right usage : lf pcf7931 config 11 22 33 44 55 66 77 20000");
  PrintAndLog("                          lf pcf7931 config FF FF FF FF FF FF FF 17500 -10 30");
  return 0;
}



int CmdLFPCF7931Write(const char *Cmd)
{
  UsbCommand c = {CMD_PCF7931_WRITE};

  int res = 0;
  res = sscanf(Cmd, "%x %x %x", &c.arg[0], &c.arg[1], &c.arg[2]);

  if(res < 1) {
      PrintAndLog("Please specify the block address in hex");
      return 0;
  }
  if (res == 1){ 
    PrintAndLog("Please specify the byte address in hex");
     return 0;
  }
  if(res == 2) {
    PrintAndLog("Please specify the data in hex (1 byte)");
     return 0;
  }
  if(res == 3) {
    uint8_t n=0;
    for(n=0;n<7;n++)  c.d.asDwords[n] = configPcf.password[n];
    c.d.asDwords[7] = (configPcf.offset[0]+128);
    c.d.asDwords[8] = (configPcf.offset[1]+128);
    c.d.asDwords[9] = configPcf.init_delay;
    SendCommand(&c);
    return 0;
  }

  PrintAndLog("INCORRECT FORMAT");
  return 0;
}


static command_t CommandTable[] = 
{
  {"help", CmdHelp, 1, "This help"},
  {"read", CmdLFPCF7931Read, 1, "Read content of a PCF7931 transponder"},
  {"write", CmdLFPCF7931Write, 1, "Write data on a PCF7931 transponder. Usage : lf pcf7931 write <bloc address> <byte address> <data>"},
   {"config", CmdLFPCF7931Config, 1, "Configure the password, the tags initialization delay and time offsets (optional)"},
  {NULL, NULL, 0, NULL}
};

int CmdLFPCF7931(const char *Cmd)
{
  CmdsParse(CommandTable, Cmd);
  return 0;
}

int CmdHelp(const char *Cmd)
{
  CmdsHelp(CommandTable);
  return 0;
}