add lf PAC/Stanley tag read (#354)

[proxmark3-svn] / client / cmdlfpac.c

diff --git a/client/cmdlfpac.c b/client/cmdlfpac.c
new file mode 100644 (file)
index 0000000..ef6b394
--- /dev/null
+++ b/client/cmdlfpac.c
@@ -0,0 +1,100 @@
+//-----------------------------------------------------------------------------
+//
+// 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 Stanley/PAC tag commands
+// NRZ, RF/32, 128 bits long (unknown cs)
+//-----------------------------------------------------------------------------
+#include "cmdlfpac.h"
+#include <string.h>
+#include <inttypes.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 "lfdemod.h"    // preamble test
+
+static int CmdHelp(const char *Cmd);
+
+// by marshmellow
+// find PAC preamble in already demoded data
+int PacFind(uint8_t *dest, size_t *size) {
+       if (*size < 128) return -1; //make sure buffer has data
+       size_t startIdx = 0;
+       uint8_t preamble[] = {1,1,1,1,1,1,1,1,0,0,1,0,0,0,0,0,0,1,0};
+       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;
+}
+
+//see NRZDemod for what args are accepted
+int CmdPacDemod(const char *Cmd) {
+
+       //NRZ
+       if (!NRZrawDemod(Cmd, false)) {
+               if (g_debugMode) PrintAndLog("DEBUG: Error - PAC: NRZ Demod failed");
+               return 0;
+       }
+       size_t size = DemodBufferLen;
+       int ans = PacFind(DemodBuffer, &size);
+       if (ans < 0) {
+               if (g_debugMode) {
+                       if (ans == -1)
+                               PrintAndLog("DEBUG: Error - PAC: too few bits found");
+                       else if (ans == -2)
+                               PrintAndLog("DEBUG: Error - PAC: preamble not found");
+                       else if (ans == -3)
+                               PrintAndLog("DEBUG: Error - PAC: Size not correct: %d", size);
+                       else
+                               PrintAndLog("DEBUG: Error - PAC: ans: %d", ans);
+               }
+               return 0;
+       }
+       setDemodBuf(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);
+
+       // preamble     then appears to have marker bits of "10"                                                                                                                                       CS?    
+       // 11111111001000000 10 01001100 10 00001101 10 00001101 10 00001101 10 00001101 10 00001101 10 00001101 10 00001101 10 00001101 10 10001100 10 100000001
+       // unknown checksum 9 bits at the end
+       
+       PrintAndLog("PAC/Stanley Tag Found -- Raw: %08X%08X%08X%08X", raw1 ,raw2, raw3, raw4);
+       PrintAndLog("\nHow the Raw ID is translated by the reader is unknown");
+       return 1;
+}
+
+int CmdPacRead(const char *Cmd) {
+       lf_read(true, 4096*2 + 20);
+       return CmdPacDemod(Cmd);
+}
+
+static command_t CommandTable[] = {
+       {"help",  CmdHelp,    1, "This help"},
+       {"demod", CmdPacDemod,1, "Attempt to read and extract tag data from the GraphBuffer"},
+       {"read",  CmdPacRead, 0, "Attempt to read and extract tag data from the antenna"},
+       {NULL, NULL, 0, NULL}
+};
+
+int CmdLFPac(const char *Cmd) {
+       clearCommandBuffer();
+       CmdsParse(CommandTable, Cmd);
+       return 0;
+}
+
+int CmdHelp(const char *Cmd) {
+       CmdsHelp(CommandTable);
+       return 0;
+}