mirror of
https://github.com/RfidResearchGroup/proxmark3.git
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173 lines
5.2 KiB
C
173 lines
5.2 KiB
C
//-----------------------------------------------------------------------------
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// Copyright (C) Proxmark3 contributors. See AUTHORS.md for details.
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// See LICENSE.txt for the text of the license.
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//-----------------------------------------------------------------------------
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// Low frequency ZX8211 tag commands
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//-----------------------------------------------------------------------------
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#include "cmdlfzx8211.h"
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#include <string.h>
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#include <ctype.h>
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#include <stdlib.h>
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#include <inttypes.h>
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#include <stdio.h>
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#include "commonutil.h" // ARRAYLEN
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#include "common.h"
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#include "cmdparser.h" // command_t
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#include "comms.h"
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#include "ui.h"
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#include "graph.h"
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#include "cmddata.h"
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#include "cmdlf.h"
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#include "protocols.h" // for T55xx config register definitions
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#include "lfdemod.h" // parityTest
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#include "cmdlft55xx.h" // write verify
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#include "cliparser.h"
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#include "zx8211.h"
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static int CmdHelp(const char *Cmd);
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// see ASKDemod for what args are accepted
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int demodzx(bool verbose) {
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(void) verbose; // unused so far
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save_restoreGB(GRAPH_SAVE);
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// CmdAskEdgeDetect("");
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// ASK / Manchester
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bool st = true;
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if (ASKDemod_ext(64, 0, 0, 0, false, false, false, 1, &st) != PM3_SUCCESS) {
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PrintAndLogEx(DEBUG, "DEBUG: Error - ZX: ASK/Manchester Demod failed");
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save_restoreGB(GRAPH_RESTORE);
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return PM3_ESOFT;
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}
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size_t size = g_DemodBufferLen;
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int ans = detectzx(g_DemodBuffer, &size);
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if (ans < 0) {
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if (ans == -1)
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PrintAndLogEx(DEBUG, "DEBUG: Error - ZX: too few bits found");
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else if (ans == -2)
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PrintAndLogEx(DEBUG, "DEBUG: Error - ZX: preamble not found");
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else if (ans == -3)
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PrintAndLogEx(DEBUG, "DEBUG: Error - ZX: Size not correct: %zu", size);
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else
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PrintAndLogEx(DEBUG, "DEBUG: Error - ZX: ans: %d", ans);
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save_restoreGB(GRAPH_RESTORE);
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return PM3_ESOFT;
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}
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setDemodBuff(g_DemodBuffer, 96, ans);
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setClockGrid(g_DemodClock, g_DemodStartIdx + (ans * g_DemodClock));
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// got a good demod
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uint32_t raw1 = bytebits_to_byte(g_DemodBuffer, 32);
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// chksum
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// test checksums
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PrintAndLogEx(SUCCESS, "ZX8211 - Card " _GREEN_("%u"), raw1);
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return PM3_SUCCESS;
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}
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static int lf_Zx_read(void) {
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PacketResponseNG resp;
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clearCommandBuffer();
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SendCommandNG(CMD_LF_ZX_READ, NULL, 0);
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if (WaitForResponseTimeout(CMD_LF_ZX_READ, &resp, 1000) == false) {
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PrintAndLogEx(ERR, "Error occurred, device did not respond during read operation.");
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return PM3_ETIMEOUT;
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}
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return PM3_SUCCESS;
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}
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static int CmdZxDemod(const char *Cmd) {
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CLIParserContext *ctx;
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CLIParserInit(&ctx, "lf zx demod",
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"Try to find zx8211 preamble, if found decode / descramble data",
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"lf zx demod"
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);
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void *argtable[] = {
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arg_param_begin,
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arg_param_end
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};
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CLIExecWithReturn(ctx, Cmd, argtable, true);
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CLIParserFree(ctx);
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return demodzx(true);
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}
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static int CmdzxReader(const char *Cmd) {
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CLIParserContext *ctx;
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CLIParserInit(&ctx, "lf zx reader",
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"read a zx tag",
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"lf zx reader -@ -> continuous reader mode"
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);
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void *argtable[] = {
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arg_param_begin,
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arg_lit0("@", NULL, "optional - continuous reader mode"),
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arg_param_end
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};
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CLIExecWithReturn(ctx, Cmd, argtable, true);
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bool cm = arg_get_lit(ctx, 1);
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CLIParserFree(ctx);
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if (cm) {
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PrintAndLogEx(INFO, "Press " _GREEN_("<Enter>") " to exit");
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}
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do {
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lf_Zx_read();
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demodzx(!cm);
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} while (cm && !kbd_enter_pressed());
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return PM3_SUCCESS;
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}
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static command_t CommandTable[] = {
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{"help", CmdHelp, AlwaysAvailable, "This help"},
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{"demod", CmdZxDemod, AlwaysAvailable, "demodulate an ZX 8211 tag from the GraphBuffer"},
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{"reader", CmdzxReader, IfPm3Lf, "attempt to read and extract tag data"},
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{NULL, NULL, NULL, NULL}
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};
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static int CmdHelp(const char *Cmd) {
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(void)Cmd; // Cmd is not used so far
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CmdsHelp(CommandTable);
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return PM3_SUCCESS;
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}
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int CmdLFZx8211(const char *Cmd) {
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clearCommandBuffer();
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return CmdsParse(CommandTable, Cmd);
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}
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int detectzx(uint8_t *dest, size_t *size) {
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if (*size < 96) return -1; // make sure buffer has data
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size_t startIdx = 0;
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uint8_t preamble[] = {0, 1, 0, 1, 0, 1, 1, 0, 0, 1, 0, 0, 1, 0, 0, 1, 0, 1, 0, 1, 0, 0, 1, 1, 0, 0, 1, 1, 0, 0, 1, 0};
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if (!preambleSearch(dest, preamble, sizeof(preamble), size, &startIdx))
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return -2; // preamble not found
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if (*size != 96) return -3; // wrong demoded size
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// return start position
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return (int)startIdx;
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}
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