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client/cmdlfmotorola.c

@@ -0,0 +1,136 @@
+//-----------------------------------------------------------------------------
+// Iceman, 2019
+//
+// 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 Motorola tag commands
+// PSK1, RF/32, 64 bits long,  at 74 kHz
+//-----------------------------------------------------------------------------
+#include "cmdlfmotorola.h"
+
+#include <ctype.h>          //tolower
+
+#include "commonutil.h"     // ARRAYLEN
+#include "common.h"
+#include "cmdparser.h"    // command_t
+#include "comms.h"
+#include "ui.h"
+#include "cmddata.h"
+#include "cmdlf.h"
+#include "lfdemod.h"    // preamble test
+#include "protocols.h"  // t55xx defines
+#include "cmdlft55xx.h" // clone..
+#include "cmdlf.h"      // cmdlfconfig
+
+static int CmdHelp(const char *Cmd);
+
+//see PSKDemod for what args are accepted
+static int CmdMotorolaDemod(const char *Cmd) {
+
+    //PSK1
+    if (PSKDemod("32 1", true) != PM3_SUCCESS) {
+        PrintAndLogEx(DEBUG, "DEBUG: Error - Motorola: PSK Demod failed");
+        return PM3_ESOFT;
+    }
+    size_t size = DemodBufferLen;
+    int ans = detectMotorola(DemodBuffer, &size);
+    if (ans < 0) {
+        if (ans == -1)
+            PrintAndLogEx(DEBUG, "DEBUG: Error - Motorola: too few bits found");
+        else if (ans == -2)
+            PrintAndLogEx(DEBUG, "DEBUG: Error - Motorola: preamble not found");
+        else if (ans == -3)
+            PrintAndLogEx(DEBUG, "DEBUG: Error - Motorola: Size not correct: %zu", size);
+        else
+            PrintAndLogEx(DEBUG, "DEBUG: Error - Motorola: ans: %d", ans);
+
+        return PM3_ESOFT;
+    }
+    setDemodBuff(DemodBuffer, 64, 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);
+
+    PrintAndLogEx(SUCCESS, "Motorola Tag Found -- Raw: %08X%08X", raw1, raw2);
+    PrintAndLogEx(INFO, "How the Raw ID is translated by the reader is unknown. Share your trace file on forum");
+    return PM3_SUCCESS;
+}
+
+static int CmdMotorolaRead(const char *Cmd) {
+    // Motorola Flexpass seem to work at 74 kHz
+    // and take about 4400 samples to befor modulating
+    sample_config sc = {
+          .decimation = 0,
+          .bits_per_sample = 0,
+          .averaging= false,
+          .divisor = LF_DIVISOR(74),
+          .trigger_threshold = -1,
+          .samples_to_skip = 4500,
+          .verbose = false
+    };
+    lf_config(&sc);
+
+    // 64 * 32 * 2 * n-ish
+    lf_read(true, 5000);
+
+    // reset back to 125 kHz
+    sc.divisor = LF_DIVISOR_125;
+    sc.samples_to_skip = 0;
+    lf_config(&sc);
+    return CmdMotorolaDemod(Cmd);
+}
+
+static int CmdMotorolaSim(const char *Cmd) {
+
+    // PSK sim.
+    PrintAndLogEx(INFO, " PSK1 at 66 kHz... Interesting.");
+    PrintAndLogEx(INFO, " To be implemented, feel free to contribute!");
+    return PM3_SUCCESS;
+}
+
+static command_t CommandTable[] = {
+    {"help",  CmdHelp,           AlwaysAvailable, "This help"},
+    {"demod", CmdMotorolaDemod,  AlwaysAvailable, "Demodulate an MOTOROLA tag from the GraphBuffer"},
+    {"read",  CmdMotorolaRead,   IfPm3Lf,         "Attempt to read and extract tag data from the antenna"},
+    {"sim",   CmdMotorolaSim,    IfPm3Lf,         "simulate MOTOROLA 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 CmdLFMotorola(const char *Cmd) {
+    clearCommandBuffer();
+    return CmdsParse(CommandTable, Cmd);
+}
+
+// find MOTOROLA preamble in already demoded data
+int detectMotorola(uint8_t *dest, size_t *size) {
+    if (*size < 64) return -1; //make sure buffer has data
+    size_t startIdx = 0;
+    uint8_t preamble[] = {
+          0, 0, 0, 0, 0, 0, 0, 0,
+          0, 0, 0, 0, 0, 0, 0, 0,
+          0, 0, 0, 0, 0, 0, 0, 1
+          };
+    if (!preambleSearch(dest, preamble, sizeof(preamble), size, &startIdx))
+        return -2; //preamble not found
+    if (*size != 64) return -3; //wrong demoded size
+    //return start position
+    return (int)startIdx;
+}
+
+int demodMotorola(void) {
+    return CmdMotorolaDemod("");
+}
+
+int readMotorolaUid(void) {
+    return ( CmdMotorolaRead("") == PM3_SUCCESS);
+}

client/cmdlfmotorola.h

@@ -0,0 +1,21 @@
+//-----------------------------------------------------------------------------
+// Iceman, 2019
+//
+// 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 MOTOROLA tag commands
+//-----------------------------------------------------------------------------
+#ifndef CMDLFMOTOROLA_H__
+#define CMDLFMOTOROLA_H__
+
+#include "common.h"
+
+int CmdLFMotorola(const char *Cmd);
+
+int demodMotorola(void);
+int detectMotorola(uint8_t *dest, size_t *size);
+int readMotorolaUid(void);
+#endif
+