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 <stdio.h>
  11 #include <string.h>
  12 #include <stdint.h>
  13 #include "proxmark3.h"
  14 #include "ui.h"
  15 #include "cmddata.h"
  16 #include "cmdlfcotag.h"
  17 #include "lfdemod.h"
  18 #include "usb_cmd.h"
  19 #include "cmdmain.h"
  20
  21 static int CmdHelp(const char *Cmd);
  22
  23 int usage_lf_cotag_read(void){
  24         PrintAndLog("Usage: lf COTAG read [h] <signaldata>");
  25         PrintAndLog("Options:");
  26         PrintAndLog("      h          : This help");
  27         PrintAndLog("      <0|1|2>    : 0 - HIGH/LOW signal; maxlength bigbuff");
  28         PrintAndLog("                 : 1 - translation of HI/LO into bytes with manchester 0,1");
  29         PrintAndLog("                 : 2 - raw signal; maxlength bigbuff");
  30         PrintAndLog("");
  31         PrintAndLog("Sample:");
  32         PrintAndLog("        lf cotag read 0");
  33         PrintAndLog("        lf cotag read 1");
  34         return 0;
  35 }
  36
  37 // COTAG demod should be able to use GraphBuffer,
  38 // when data load samples
  39 int CmdCOTAGDemod(const char *Cmd) {
  40
  41         uint8_t bits[COTAG_BITS] = {0};
  42         size_t bitlen = COTAG_BITS;
  43         memcpy(bits, DemodBuffer, COTAG_BITS);
  44
  45         uint8_t alignPos = 0;
  46         int err = manrawdecode(bits, &bitlen, 1, &alignPos);
  47         if (err){
  48                 if (g_debugMode) PrintAndLog("DEBUG: Error - COTAG too many errors: %d", err);
  49                 return -1;
  50         }
  51
  52         setDemodBuf(bits, bitlen, 0);
  53
  54         //got a good demod
  55         uint16_t cn = bytebits_to_byteLSBF(bits+1, 16);
  56         uint32_t fc = bytebits_to_byteLSBF(bits+1+16, 8);
  57
  58         uint32_t raw1 = bytebits_to_byteLSBF(bits, 32);
  59         uint32_t raw2 = bytebits_to_byteLSBF(bits+32, 32);
  60         uint32_t raw3 = bytebits_to_byteLSBF(bits+64, 32);
  61         uint32_t raw4 = bytebits_to_byteLSBF(bits+96, 32);
  62
  63         /*
  64         fc 161:   1010 0001 -> LSB 1000 0101
  65         cn 33593  1000 0011 0011 1001 -> LSB 1001 1100 1100 0001
  66         cccc cccc cccc cccc                     ffffffff
  67           0 1001 1100 1100 0001 1000 0101 0000 0000 100001010000000001111011100000011010000010000000000000000000000000000000000000000000000000000000100111001100000110000101000
  68         1001 1100 1100 0001                     10000101
  69         */
  70         PrintAndLog("COTAG Found: FC %u, CN: %u Raw: %08X%08X%08X%08X", fc, cn, raw1 ,raw2, raw3, raw4);
  71         return 1;
  72 }
  73
  74 // When reading a COTAG.
  75 // 0 = HIGH/LOW signal - maxlength bigbuff
  76 // 1 = translation for HI/LO into bytes with manchester 0,1 - length 300
  77 // 2 = raw signal -  maxlength bigbuff
  78 int CmdCOTAGRead(const char *Cmd) {
  79
  80         if (Cmd[0] == 'h' || Cmd[0] == 'H') return usage_lf_cotag_read();
  81
  82         uint32_t rawsignal = 1;
  83         sscanf(Cmd, "%u", &rawsignal);
  84
  85         UsbCommand c = {CMD_COTAG, {rawsignal, 0, 0}};
  86         clearCommandBuffer();
  87         SendCommand(&c);
  88         if ( !WaitForResponseTimeout(CMD_ACK, NULL, 7000) ) {
  89                 PrintAndLog("command execution time out");
  90                 return -1;
  91         }
  92
  93         switch ( rawsignal ){
  94                 case 0:
  95                 case 2: {
  96                         CmdPlot("");
  97                         CmdGrid("384");
  98                         getSamples(0, true); break;
  99                 }
 100                 case 1: {
 101                         UsbCommand response;
 102                         DemodBufferLen = COTAG_BITS;
 103                         if (!GetFromBigBuf(DemodBuffer, COTAG_BITS, 0, &response, 1000, true)) {
 104                                 PrintAndLog("timeout while waiting for reply.");
 105                                 return -1;
 106                         }
 107                         return CmdCOTAGDemod("");
 108                 }
 109         }
 110         return 0;
 111 }
 112
 113 static command_t CommandTable[] = {
 114         {"help",      CmdHelp,         1, "This help"},
 115         {"demod",     CmdCOTAGDemod,   1, "Tries to decode a COTAG signal"},
 116         {"read",      CmdCOTAGRead,    0, "Attempt to read and extract tag data"},
 117         {NULL, NULL, 0, NULL}
 118 };
 119
 120 int CmdLFCOTAG(const char *Cmd) {
 121         clearCommandBuffer();
 122         CmdsParse(CommandTable, Cmd);
 123         return 0;
 124 }
 125
 126 int CmdHelp(const char *Cmd) {
 127         CmdsHelp(CommandTable);
 128         return 0;
 129 }