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

   1 //-----------------------------------------------------------------------------
   2 // Authored by Iceman
   3 //
   4 // This code is licensed to you under the terms of the GNU GPL, version 2 or,
   5 // at your option, any later version. See the LICENSE.txt file for the text of
   6 // the license.
   7 //-----------------------------------------------------------------------------
   8 // Low frequency COTAG commands
   9 //-----------------------------------------------------------------------------
  10 #include "cmdlfcotag.h"  // COTAG function declarations
  11
  12 static int CmdHelp(const char *Cmd);
  13
  14 int usage_lf_cotag_read(void){
  15         PrintAndLog("Usage: lf COTAG read [h] <signaldata>");
  16         PrintAndLog("Options:");
  17         PrintAndLog("      h          : This help");
  18         PrintAndLog("      <0|1|2>    : 0 - HIGH/LOW signal; maxlength bigbuff");
  19         PrintAndLog("                 : 1 - translation of HI/LO into bytes with manchester 0,1");
  20         PrintAndLog("                 : 2 - raw signal; maxlength bigbuff");
  21         PrintAndLog("");
  22         PrintAndLog("Sample:");
  23         PrintAndLog("        lf cotag read 0");
  24         PrintAndLog("        lf cotag read 1");
  25         return 0;
  26 }
  27
  28 // COTAG demod should be able to use GraphBuffer,
  29 // when data load samples
  30 int CmdCOTAGDemod(const char *Cmd) {
  31
  32         uint8_t bits[COTAG_BITS] = {0};
  33         size_t bitlen = COTAG_BITS;
  34         memcpy(bits, DemodBuffer, COTAG_BITS);
  35
  36         int err = manrawdecode(bits, &bitlen, 1);
  37         if (err){
  38                 if (g_debugMode) PrintAndLog("DEBUG: Error - COTAG too many errors: %d", err);
  39                 return -1;
  40         }
  41
  42         setDemodBuf(bits, bitlen, 0);
  43
  44         //got a good demod
  45         uint16_t cn = bytebits_to_byteLSBF(bits+1, 16);
  46         uint32_t fc = bytebits_to_byteLSBF(bits+1+16, 8);
  47
  48         uint32_t raw1 = bytebits_to_byteLSBF(bits, 32);
  49         uint32_t raw2 = bytebits_to_byteLSBF(bits+32, 32);
  50         uint32_t raw3 = bytebits_to_byteLSBF(bits+64, 32);
  51         uint32_t raw4 = bytebits_to_byteLSBF(bits+96, 32);
  52
  53         /*
  54         fc 161:   1010 0001 -> LSB 1000 0101
  55         cn 33593  1000 0011 0011 1001 -> LSB 1001 1100 1100 0001
  56         cccc cccc cccc cccc                     ffffffff
  57           0 1001 1100 1100 0001 1000 0101 0000 0000 100001010000000001111011100000011010000010000000000000000000000000000000000000000000000000000000100111001100000110000101000
  58         1001 1100 1100 0001                     10000101
  59         */
  60         PrintAndLog("COTAG Found: FC %u, CN: %u Raw: %08X%08X%08X%08X", fc, cn, raw1 ,raw2, raw3, raw4);
  61         return 1;
  62 }
  63
  64 // When reading a COTAG.
  65 // 0 = HIGH/LOW signal - maxlength bigbuff
  66 // 1 = translation for HI/LO into bytes with manchester 0,1 - length 300
  67 // 2 = raw signal -  maxlength bigbuff
  68 int CmdCOTAGRead(const char *Cmd) {
  69
  70         if (Cmd[0] == 'h' || Cmd[0] == 'H') return usage_lf_cotag_read();
  71
  72         uint32_t rawsignal = 1;
  73         sscanf(Cmd, "%u", &rawsignal);
  74
  75         UsbCommand c = {CMD_COTAG, {rawsignal, 0, 0}};
  76         clearCommandBuffer();
  77         SendCommand(&c);
  78         if ( !WaitForResponseTimeout(CMD_ACK, NULL, 7000) ) {
  79                 PrintAndLog("command execution time out");
  80                 return -1;
  81         }
  82
  83         switch ( rawsignal ){
  84                 case 0:
  85                 case 2: {
  86                         CmdPlot("");
  87                         CmdGrid("384");
  88                         getSamples("", true); break;
  89                 }
  90                 case 1: {
  91                         GetFromBigBuf(DemodBuffer, COTAG_BITS, 0);
  92                         DemodBufferLen = COTAG_BITS;
  93                         UsbCommand response;
  94                         if ( !WaitForResponseTimeout(CMD_ACK, &response, 1000) ) {
  95                                 PrintAndLog("timeout while waiting for reply.");
  96                                 return -1;
  97                         }
  98                         return CmdCOTAGDemod("");
  99                 }
 100         }
 101         return 0;
 102 }
 103
 104 static command_t CommandTable[] = {
 105         {"help",      CmdHelp,         1, "This help"},
 106         {"demod",     CmdCOTAGDemod,   1, "Tries to decode a COTAG signal"},
 107         {"read",      CmdCOTAGRead,    0, "Attempt to read and extract tag data"},
 108         {NULL, NULL, 0, NULL}
 109 };
 110
 111 int CmdLFCOTAG(const char *Cmd) {
 112         clearCommandBuffer();
 113         CmdsParse(CommandTable, Cmd);
 114         return 0;
 115 }
 116
 117 int CmdHelp(const char *Cmd) {
 118         CmdsHelp(CommandTable);
 119         return 0;
 120 }