//-----------------------------------------------------------------------------
//
// 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 Presco tag commands
//-----------------------------------------------------------------------------
#include "cmdlfpresco.h"
#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include <ctype.h>
#include "commonutil.h" // ARRAYLEN
#include "cmdparser.h" // command_t
#include "comms.h"
#include "ui.h"
#include "cmddata.h"
#include "cmdlf.h"
#include "protocols.h" // for T55xx config register definitions
#include "lfdemod.h" // parityTest
#include "cmdlft55xx.h" // verifywrite
static int CmdHelp(const char *Cmd);
static int usage_lf_presco_clone(void) {
PrintAndLogEx(NORMAL, "clone a Presco tag to a T55x7 tag.");
PrintAndLogEx(NORMAL, "Usage: lf presco clone [h] d <Card-ID> c <hex-ID> <Q5>");
PrintAndLogEx(NORMAL, "Options:");
PrintAndLogEx(NORMAL, " h : this help");
PrintAndLogEx(NORMAL, " d <Card-ID> : 9 digit presco card ID");
PrintAndLogEx(NORMAL, " c <hex-ID> : 8 digit hex card number");
PrintAndLogEx(NORMAL, " <Q5> : specify write to Q5 (t5555 instead of t55x7)");
PrintAndLogEx(NORMAL, "");
PrintAndLogEx(NORMAL, "Examples:");
PrintAndLogEx(NORMAL, " lf presco clone d 123456789");
return PM3_SUCCESS;
}
static int usage_lf_presco_sim(void) {
PrintAndLogEx(NORMAL, "Enables simulation of presco card with specified card number.");
PrintAndLogEx(NORMAL, "Simulation runs until the button is pressed or another USB command is issued.");
PrintAndLogEx(NORMAL, "Per presco format, the card number is 9 digit number and can contain *# chars. Larger values are truncated.");
PrintAndLogEx(NORMAL, "");
PrintAndLogEx(NORMAL, "Usage: lf presco sim [h] d <Card-ID> or c <hex-ID>");
PrintAndLogEx(NORMAL, "Options:");
PrintAndLogEx(NORMAL, " h : this help");
PrintAndLogEx(NORMAL, " d <Card-ID> : 9 digit presco card number");
PrintAndLogEx(NORMAL, " c <hex-ID> : 8 digit hex card number");
PrintAndLogEx(NORMAL, "");
PrintAndLogEx(NORMAL, "Examples:");
PrintAndLogEx(NORMAL, " lf presco sim d 123456789");
return PM3_SUCCESS;
}
//see ASKDemod for what args are accepted
static int CmdPrescoDemod(const char *Cmd) {
(void)Cmd; // Cmd is not used so far
bool st = true;
if (ASKDemod_ext("32 0 0 0 0 a", false, false, 1, &st) != PM3_SUCCESS) {
PrintAndLogEx(DEBUG, "DEBUG: Error Presco ASKDemod failed");
return PM3_ESOFT;
}
size_t size = DemodBufferLen;
int ans = detectPresco(DemodBuffer, &size);
if (ans < 0) {
if (ans == -1)
PrintAndLogEx(DEBUG, "DEBUG: Error - Presco: too few bits found");
else if (ans == -2)
PrintAndLogEx(DEBUG, "DEBUG: Error - Presco: preamble not found");
else if (ans == -3)
PrintAndLogEx(DEBUG, "DEBUG: Error - Presco: Size not correct: %zu", size);
else
PrintAndLogEx(DEBUG, "DEBUG: Error - Presco: ans: %d", ans);
return PM3_ESOFT;
}
setDemodBuff(DemodBuffer, 128, ans);
setClockGrid(g_DemodClock, g_DemodStartIdx + (ans * g_DemodClock));
//got a good demod
uint32_t raw1 = bytebits_to_byte(DemodBuffer, 32);
uint32_t raw2 = bytebits_to_byte(DemodBuffer + 32, 32);
uint32_t raw3 = bytebits_to_byte(DemodBuffer + 64, 32);
uint32_t raw4 = bytebits_to_byte(DemodBuffer + 96, 32);
uint32_t cardid = raw4;
PrintAndLogEx(SUCCESS, "Presco Tag Found: Card ID %08X, Raw: %08X%08X%08X%08X", cardid, raw1, raw2, raw3, raw4);
uint32_t sitecode = 0, usercode = 0, fullcode = 0;
bool Q5 = false;
char cmd[12] = {0};
sprintf(cmd, "H %08X", cardid);
getWiegandFromPresco(cmd, &sitecode, &usercode, &fullcode, &Q5);
PrintAndLogEx(SUCCESS, "SiteCode %u, UserCode %u, FullCode, %08X", sitecode, usercode, fullcode);
return PM3_SUCCESS;
}
//see ASKDemod for what args are accepted
static int CmdPrescoRead(const char *Cmd) {
// Presco Number: 123456789 --> Sitecode 30 | usercode 8665
lf_read(false, 12000);
return CmdPrescoDemod(Cmd);
}
// takes base 12 ID converts to hex
// Or takes 8 digit hex ID
static int CmdPrescoClone(const char *Cmd) {
bool Q5 = false;
uint32_t sitecode = 0, usercode = 0, fullcode = 0;
uint32_t blocks[5] = {T55x7_MODULATION_MANCHESTER | T55x7_BITRATE_RF_32 | 4 << T55x7_MAXBLOCK_SHIFT | T55x7_ST_TERMINATOR, 0, 0, 0, 0};
// get wiegand from printed number.
if (getWiegandFromPresco(Cmd, &sitecode, &usercode, &fullcode, &Q5) == PM3_EINVARG) return usage_lf_presco_clone();
if (Q5)
blocks[0] = T5555_MODULATION_MANCHESTER | T5555_SET_BITRATE(32) | 4 << T5555_MAXBLOCK_SHIFT | T5555_ST_TERMINATOR;
if ((sitecode & 0xFF) != sitecode) {
sitecode &= 0xFF;
PrintAndLogEx(INFO, "Facility-Code Truncated to 8-bits (Presco): %u", sitecode);
}
if ((usercode & 0xFFFF) != usercode) {
usercode &= 0xFFFF;
PrintAndLogEx(INFO, "Card Number Truncated to 16-bits (Presco): %u", usercode);
}
blocks[1] = 0x10D00000; //preamble
blocks[2] = 0x00000000;
blocks[3] = 0x00000000;
blocks[4] = fullcode;
PrintAndLogEx(INFO, "Preparing to clone Presco to T55x7 with SiteCode: %u, UserCode: %u, FullCode: %08x", sitecode, usercode, fullcode);
print_blocks(blocks, ARRAYLEN(blocks));
int res = clone_t55xx_tag(blocks, ARRAYLEN(blocks));
PrintAndLogEx(SUCCESS, "Done");
PrintAndLogEx(INFO, "Hint: try " _YELLOW_("`lf presco read`") "to verify");
return res;
}
// takes base 12 ID converts to hex
// Or takes 8 digit hex ID
static int CmdPrescoSim(const char *Cmd) {
uint32_t sitecode = 0, usercode = 0, fullcode = 0;
bool Q5 = false;
// get wiegand from printed number.
if (getWiegandFromPresco(Cmd, &sitecode, &usercode, &fullcode, &Q5) == PM3_EINVARG)
return usage_lf_presco_sim();
PrintAndLogEx(SUCCESS, "Simulating Presco - SiteCode: %u, UserCode: %u, FullCode: %08X", sitecode, usercode, fullcode);
uint8_t bs[128];
getPrescoBits(fullcode, bs);
lf_asksim_t *payload = calloc(1, sizeof(lf_asksim_t) + sizeof(bs));
payload->encoding = 1;
payload->invert = 0;
payload->separator = 1;
payload->clock = 32;
memcpy(payload->data, bs, sizeof(bs));
clearCommandBuffer();
SendCommandNG(CMD_LF_ASK_SIMULATE, (uint8_t *)payload, sizeof(lf_asksim_t) + sizeof(bs));
free(payload);
PacketResponseNG resp;
WaitForResponse(CMD_LF_ASK_SIMULATE, &resp);
PrintAndLogEx(INFO, "Done");
if (resp.status != PM3_EOPABORTED)
return resp.status;
return PM3_SUCCESS;
}
static command_t CommandTable[] = {
{"help", CmdHelp, AlwaysAvailable, "This help"},
{"read", CmdPrescoRead, IfPm3Lf, "Attempt to read and Extract tag data"},
{"clone", CmdPrescoClone, IfPm3Lf, "clone presco tag to T55x7 (or to q5/T5555)"},
{"sim", CmdPrescoSim, IfPm3Lf, "simulate presco tag"},
{NULL, NULL, NULL, NULL}
};
static int CmdHelp(const char *Cmd) {
(void)Cmd; // Cmd is not used so far
CmdsHelp(CommandTable);
return PM3_SUCCESS;
}
int CmdLFPresco(const char *Cmd) {
clearCommandBuffer();
return CmdsParse(CommandTable, Cmd);
}
// find presco preamble 0x10D in already demoded data
int detectPresco(uint8_t *dest, size_t *size) {
if (*size < 128 * 2) return -1; //make sure buffer has data
size_t startIdx = 0;
uint8_t preamble[] = {0, 0, 0, 1, 0, 0, 0, 0, 1, 1, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0};
if (!preambleSearch(dest, preamble, sizeof(preamble), size, &startIdx))
return -2; //preamble not found
if (*size != 128) return -3; //wrong demoded size
//return start position
return (int)startIdx;
}
// convert base 12 ID to sitecode & usercode & 8 bit other unknown code
int getWiegandFromPresco(const char *Cmd, uint32_t *sitecode, uint32_t *usercode, uint32_t *fullcode, bool *Q5) {
bool hex = false, errors = false;
uint8_t cmdp = 0;
char id[11];
int stringlen = 0;
memset(id, 0x00, sizeof(id));
while (param_getchar(Cmd, cmdp) != 0x00 && !errors) {
switch (tolower(param_getchar(Cmd, cmdp))) {
case 'h':
return PM3_EINVARG;
case 'c':
hex = true;
//get hex
*fullcode = param_get32ex(Cmd, cmdp + 1, 0, 16);
cmdp += 2;
break;
case 'd':
//param get string int param_getstr(const char *line, int paramnum, char * str)
stringlen = param_getstr(Cmd, cmdp + 1, id, sizeof(id));
if (stringlen < 2) return PM3_EINVARG;
cmdp += 2;
break;
case 'q':
*Q5 = true;
cmdp++;
break;
default:
PrintAndLogEx(WARNING, "Unknown parameter '%c'", param_getchar(Cmd, cmdp));
errors = 1;
break;
}
}
//Validations
if (errors || cmdp == 0) return PM3_EINVARG;
if (!hex) {
uint8_t val = 0;
for (int index = 0; index < strlen(id); ++index) {
// Get value from number string.
if (id[index] == '*')
val = 10;
if (id[index] == '#')
val = 11;
if (id[index] >= 0x30 && id[index] <= 0x39)
val = id[index] - 0x30;
*fullcode += val;
// last digit is only added, not multipled.
if (index < strlen(id) - 1)
*fullcode *= 12;
}
}
*usercode = *fullcode & 0x0000FFFF; //% 65566
*sitecode = (*fullcode >> 24) & 0x000000FF; // /= 16777216;
return PM3_SUCCESS;
}
// calc not certain - intended to get bitstream for programming / sim
int getPrescoBits(uint32_t fullcode, uint8_t *prescoBits) {
num_to_bytebits(0x10D00000, 32, prescoBits);
num_to_bytebits(0x00000000, 32, prescoBits + 32);
num_to_bytebits(0x00000000, 32, prescoBits + 64);
num_to_bytebits(fullcode, 32, prescoBits + 96);
return PM3_SUCCESS;
}
int demodPresco(void) {
return CmdPrescoDemod("");
}