git.zerfleddert.de Git - proxmark3-svn/blob - client/cmdlfparadox.c

   1 //-----------------------------------------------------------------------------
   2 //
   3 // This code is licensed to you under the terms of the GNU GPL, version 2 or,
   4 // at your option, any later version. See the LICENSE.txt file for the text of
   5 // the license.
   6 //-----------------------------------------------------------------------------
   7 // Low frequency Paradox tag commands
   8 // FSK2a, rf/50, 96 bits (completely known)
   9 //-----------------------------------------------------------------------------
  10 #include <stdio.h>
  11 #include <string.h>
  12 #include <inttypes.h>
  13 #include "cmdlfparadox.h"
  14 #include "proxmark3.h"
  15 #include "ui.h"
  16 #include "util.h"
  17 #include "graph.h"
  18 #include "cmdparser.h"
  19 #include "cmddata.h"
  20 #include "cmdlf.h"
  21 #include "lfdemod.h"
  22 static int CmdHelp(const char *Cmd);
  23
  24 //by marshmellow
  25 //Paradox Prox demod - FSK RF/50 with preamble of 00001111 (then manchester encoded)
  26 //print full Paradox Prox ID and some bit format details if found
  27 int CmdFSKdemodParadox(const char *Cmd)
  28 {
  29         //raw fsk demod no manchester decoding no start bit finding just get binary from wave
  30         uint32_t hi2=0, hi=0, lo=0;
  31
  32         uint8_t BitStream[MAX_GRAPH_TRACE_LEN]={0};
  33         size_t BitLen = getFromGraphBuf(BitStream);
  34         if (BitLen==0) return 0;
  35         int waveIdx=0;
  36         //get binary from fsk wave
  37         int idx = ParadoxdemodFSK(BitStream,&BitLen,&hi2,&hi,&lo,&waveIdx);
  38         if (idx<0){
  39                 if (g_debugMode){
  40                         if (idx==-1){
  41                                 PrintAndLog("DEBUG: Just Noise Detected");
  42                         } else if (idx == -2) {
  43                                 PrintAndLog("DEBUG: Error demoding fsk");
  44                         } else if (idx == -3) {
  45                                 PrintAndLog("DEBUG: Preamble not found");
  46                         } else if (idx == -4) {
  47                                 PrintAndLog("DEBUG: Error in Manchester data");
  48                         } else {
  49                                 PrintAndLog("DEBUG: Error demoding fsk %d", idx);
  50                         }
  51                 }
  52                 return 0;
  53         }
  54         if (hi2==0 && hi==0 && lo==0){
  55                 if (g_debugMode) PrintAndLog("DEBUG: Error - no value found");
  56                 return 0;
  57         }
  58         uint32_t fc = ((hi & 0x3)<<6) | (lo>>26);
  59         uint32_t cardnum = (lo>>10)&0xFFFF;
  60         uint32_t rawLo = bytebits_to_byte(BitStream+idx+64,32);
  61         uint32_t rawHi = bytebits_to_byte(BitStream+idx+32,32);
  62         uint32_t rawHi2 = bytebits_to_byte(BitStream+idx,32);
  63
  64         PrintAndLog("Paradox TAG ID: %x%08x - FC: %d - Card: %d - Checksum: %02x - RAW: %08x%08x%08x",
  65                 hi>>10, (hi & 0x3)<<26 | (lo>>10), fc, cardnum, (lo>>2) & 0xFF, rawHi2, rawHi, rawLo);
  66         setDemodBuf(BitStream,BitLen,idx);
  67         setClockGrid(50, waveIdx + (idx*50));
  68         if (g_debugMode){
  69                 PrintAndLog("DEBUG: idx: %d, len: %d, Printing Demod Buffer:", idx, BitLen);
  70                 printDemodBuff();
  71         }
  72         return 1;
  73 }
  74 //by marshmellow
  75 //see ASKDemod for what args are accepted
  76 int CmdParadoxRead(const char *Cmd) {
  77         // read lf silently
  78         lf_read(true, 10000);
  79         // demod and output viking ID
  80         return CmdFSKdemodParadox(Cmd);
  81 }
  82
  83 static command_t CommandTable[] = {
  84         {"help",  CmdHelp,            1, "This help"},
  85         {"demod", CmdFSKdemodParadox, 1, "Demodulate a Paradox FSK tag from the GraphBuffer"},
  86         {"read",  CmdParadoxRead,     0, "Attempt to read and Extract tag data from the antenna"},
  87         {NULL, NULL, 0, NULL}
  88 };
  89
  90 int CmdLFParadox(const char *Cmd) {
  91         CmdsParse(CommandTable, Cmd);
  92         return 0;
  93 }
  94
  95 int CmdHelp(const char *Cmd) {
  96         CmdsHelp(CommandTable);
  97         return 0;
  98 }