//-----------------------------------------------------------------------------
// 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 "util.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);
#define PCF7931_DEFAULT_INITDELAY 17500
#define PCF7931_DEFAULT_OFFSET_WIDTH 0
#define PCF7931_DEFAULT_OFFSET_POSITION 0
// Default values - Configuration
struct pcf7931_config configPcf = {
{0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF},
PCF7931_DEFAULT_INITDELAY,
PCF7931_DEFAULT_OFFSET_WIDTH,
PCF7931_DEFAULT_OFFSET_POSITION
};
// Resets the configuration settings to default values.
int pcf7931_resetConfig() {
memset(configPcf.Pwd, 0xFF, sizeof(configPcf.Pwd));
configPcf.InitDelay = PCF7931_DEFAULT_INITDELAY;
configPcf.OffsetWidth = PCF7931_DEFAULT_OFFSET_WIDTH;
configPcf.OffsetPosition = PCF7931_DEFAULT_OFFSET_POSITION;
return 0;
}
int pcf7931_printConfig() {
PrintAndLogEx(NORMAL, "Password (LSB first on bytes) : %s", sprint_hex(configPcf.Pwd, sizeof(configPcf.Pwd)));
PrintAndLogEx(NORMAL, "Tag initialization delay : %d us", configPcf.InitDelay);
PrintAndLogEx(NORMAL, "Offset low pulses width : %d us", configPcf.OffsetWidth);
PrintAndLogEx(NORMAL, "Offset low pulses position : %d us", configPcf.OffsetPosition);
return 0;
}
int usage_pcf7931_read() {
PrintAndLogEx(NORMAL, "Usage: lf pcf7931 read [h] ");
PrintAndLogEx(NORMAL, "This command tries to read a PCF7931 tag.");
PrintAndLogEx(NORMAL, "Options:");
PrintAndLogEx(NORMAL, " h This help");
PrintAndLogEx(NORMAL, "Examples:");
PrintAndLogEx(NORMAL, " lf pcf7931 read");
return 0;
}
int usage_pcf7931_write() {
PrintAndLogEx(NORMAL, "Usage: lf pcf7931 write [h] <block address> <byte address> <data>");
PrintAndLogEx(NORMAL, "This command tries to write a PCF7931 tag.");
PrintAndLogEx(NORMAL, "Options:");
PrintAndLogEx(NORMAL, " h This help");
PrintAndLogEx(NORMAL, " blockaddress Block to save [0-7]");
PrintAndLogEx(NORMAL, " byteaddress Index of byte inside block to write [0-15]");
PrintAndLogEx(NORMAL, " data one byte of data (hex)");
PrintAndLogEx(NORMAL, "Examples:");
PrintAndLogEx(NORMAL, " lf pcf7931 write 2 1 FF");
return 0;
}
int usage_pcf7931_config() {
PrintAndLogEx(NORMAL, "Usage: lf pcf7931 config [h] [r] <pwd> <delay> <offset width> <offset position>");
PrintAndLogEx(NORMAL, "This command tries to set the configuration used with PCF7931 commands");
PrintAndLogEx(NORMAL, "The time offsets could be useful to correct slew rate generated by the antenna");
PrintAndLogEx(NORMAL, "Caling without some parameter will print the current configuration.");
PrintAndLogEx(NORMAL, "Options:");
PrintAndLogEx(NORMAL, " h This help");
PrintAndLogEx(NORMAL, " r Reset configuration to default values");
PrintAndLogEx(NORMAL, " pwd Password, hex, 7bytes, LSB-order");
PrintAndLogEx(NORMAL, " delay Tag initialization delay (in us) decimal");
PrintAndLogEx(NORMAL, " offset Low pulses width (in us) decimal");
PrintAndLogEx(NORMAL, " offset Low pulses position (in us) decimal");
PrintAndLogEx(NORMAL, "Examples:");
PrintAndLogEx(NORMAL, " lf pcf7931 config");
PrintAndLogEx(NORMAL, " lf pcf7931 config r");
PrintAndLogEx(NORMAL, " lf pcf7931 config 11223344556677 20000");
PrintAndLogEx(NORMAL, " lf pcf7931 config 11223344556677 17500 -10 30");
return 0;
}
int CmdLFPCF7931Read(const char *Cmd) {
uint8_t ctmp = param_getchar(Cmd, 0);
if (ctmp == 'H' || ctmp == 'h') return usage_pcf7931_read();
UsbCommand resp;
UsbCommand c = {CMD_PCF7931_READ, {0, 0, 0}};
clearCommandBuffer();
SendCommand(&c);
if (!WaitForResponseTimeout(CMD_ACK, &resp, 2500)) {
PrintAndLogEx(WARNING, "command execution time out");
return 1;
}
return 0;
}
int CmdLFPCF7931Config(const char *Cmd) {
uint8_t ctmp = param_getchar(Cmd, 0);
if (ctmp == 0) return pcf7931_printConfig();
if (ctmp == 'H' || ctmp == 'h') return usage_pcf7931_config();
if (ctmp == 'R' || ctmp == 'r') return pcf7931_resetConfig();
if (param_gethex(Cmd, 0, configPcf.Pwd, 14)) return usage_pcf7931_config();
configPcf.InitDelay = (param_get32ex(Cmd, 1, 0, 10) & 0xFFFF);
configPcf.OffsetWidth = (int)(param_get32ex(Cmd, 2, 0, 10) & 0xFFFF);
configPcf.OffsetPosition = (int)(param_get32ex(Cmd, 3, 0, 10) & 0xFFFF);
pcf7931_printConfig();
return 0;
}
int CmdLFPCF7931Write(const char *Cmd) {
uint8_t ctmp = param_getchar(Cmd, 0);
if (strlen(Cmd) < 1 || ctmp == 'h' || ctmp == 'H') return usage_pcf7931_write();
uint8_t block = 0, bytepos = 0, data = 0;
if (param_getdec(Cmd, 0, &block)) return usage_pcf7931_write();
if (param_getdec(Cmd, 1, &bytepos)) return usage_pcf7931_write();
if ((block > 7) || (bytepos > 15)) return usage_pcf7931_write();
data = param_get8ex(Cmd, 2, 0, 16);
PrintAndLogEx(NORMAL, "Writing block: %d", block);
PrintAndLogEx(NORMAL, " pos: %d", bytepos);
PrintAndLogEx(NORMAL, " data: 0x%02X", data);
UsbCommand c = {CMD_PCF7931_WRITE, { block, bytepos, data} };
memcpy(c.d.asDwords, configPcf.Pwd, sizeof(configPcf.Pwd));
c.d.asDwords[7] = (configPcf.OffsetWidth + 128);
c.d.asDwords[8] = (configPcf.OffsetPosition + 128);
c.d.asDwords[9] = configPcf.InitDelay;
clearCommandBuffer();
SendCommand(&c);
//no ack?
return 0;
}
static command_t CommandTable[] = {
{"help", CmdHelp, 1, "This help"},
{"read", CmdLFPCF7931Read, 0, "Read content of a PCF7931 transponder"},
{"write", CmdLFPCF7931Write, 0, "Write data on a PCF7931 transponder."},
{"config", CmdLFPCF7931Config, 1, "Configure the password, the tags initialization delay and time offsets (optional)"},
{NULL, NULL, 0, NULL}
};
int CmdLFPCF7931(const char *Cmd) {
clearCommandBuffer();
CmdsParse(CommandTable, Cmd);
return 0;
}
int CmdHelp(const char *Cmd) {
CmdsHelp(CommandTable);
return 0;
}