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

   1 //-----------------------------------------------------------------------------
   2 // Copyright (C) 2012 Roel Verdult
   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 Hitag support
   9 //-----------------------------------------------------------------------------
  10
  11 #include <stdio.h>
  12 #include <stdlib.h>
  13 #include <string.h>
  14 #include "data.h"
  15 #include "proxusb.h"
  16 #include "ui.h"
  17 #include "cmdparser.h"
  18 #include "common.h"
  19 #include "util.h"
  20 #include "hitag2.h"
  21
  22 static int CmdHelp(const char *Cmd);
  23
  24 int CmdLFHitagList(const char *Cmd)
  25 {
  26   uint8_t got[3000];
  27   GetFromBigBuf(got,sizeof(got),0);
  28
  29   PrintAndLog("recorded activity:");
  30   PrintAndLog(" ETU     :rssi: who bytes");
  31   PrintAndLog("---------+----+----+-----------");
  32
  33   int i = 0;
  34   int prev = -1;
  35
  36   for (;;) {
  37     if(i >= 1900) {
  38       break;
  39     }
  40
  41     bool isResponse;
  42     int timestamp = *((uint32_t *)(got+i));
  43     if (timestamp & 0x80000000) {
  44       timestamp &= 0x7fffffff;
  45       isResponse = 1;
  46     } else {
  47       isResponse = 0;
  48     }
  49
  50     int metric = 0;
  51     int parityBits = *((uint32_t *)(got+i+4));
  52     // 4 bytes of additional information...
  53     // maximum of 32 additional parity bit information
  54     //
  55     // TODO:
  56     // at each quarter bit period we can send power level (16 levels)
  57     // or each half bit period in 256 levels.
  58
  59     int len = got[i+8];
  60
  61     if (len > 100) {
  62       break;
  63     }
  64     if (i + len >= 1900) {
  65       break;
  66     }
  67
  68     uint8_t *frame = (got+i+9);
  69
  70     // Break and stick with current result if buffer was not completely full
  71     if (frame[0] == 0x44 && frame[1] == 0x44 && frame[3] == 0x44) { break; }
  72
  73     char line[1000] = "";
  74     int j;
  75     for (j = 0; j < len; j++) {
  76       int oddparity = 0x01;
  77       int k;
  78
  79       for (k=0;k<8;k++) {
  80         oddparity ^= (((frame[j] & 0xFF) >> k) & 0x01);
  81       }
  82
  83       //if((parityBits >> (len - j - 1)) & 0x01) {
  84       if (isResponse && (oddparity != ((parityBits >> (len - j - 1)) & 0x01))) {
  85         sprintf(line+(j*4), "%02x!  ", frame[j]);
  86       }
  87       else {
  88         sprintf(line+(j*4), "%02x   ", frame[j]);
  89       }
  90     }
  91
  92     char metricString[100];
  93     if (isResponse) {
  94       sprintf(metricString, "%3d", metric);
  95     } else {
  96       strcpy(metricString, "   ");
  97     }
  98
  99     PrintAndLog(" +%7d: %s: %s %s",
 100       (prev < 0 ? 0 : (timestamp - prev)),
 101       metricString,
 102       (isResponse ? "TAG" : "   "),
 103       line);
 104
 105     prev = timestamp;
 106     i += (len + 9);
 107   }
 108         return 0;
 109 }
 110
 111 int CmdLFHitagSnoop(const char *Cmd) {
 112   UsbCommand c = {CMD_SNOOP_HITAG};
 113   SendCommand(&c);
 114   return 0;
 115 }
 116
 117 int CmdLFHitagSim(const char *Cmd) {
 118   UsbCommand c = {CMD_SIMULATE_HITAG};
 119         char filename[256];
 120         FILE* pf;
 121         bool tag_mem_supplied;
 122
 123         param_getstr(Cmd,0,filename);
 124
 125         if (strlen(filename) > 0) {
 126                 if ((pf = fopen(filename,"rb+")) == NULL) {
 127                         PrintAndLog("Error: Could not open file [%s]",filename);
 128                         return 1;
 129                 }
 130                 tag_mem_supplied = true;
 131                 fread(c.d.asBytes,48,1,pf);
 132                 fclose(pf);
 133         } else {
 134                 tag_mem_supplied = false;
 135         }
 136
 137         // Does the tag comes with memory
 138         c.arg[0] = (uint32_t)tag_mem_supplied;
 139
 140   SendCommand(&c);
 141   return 0;
 142 }
 143
 144 int CmdLFHitagReader(const char *Cmd) {
 145 //  UsbCommand c = {CMD_READER_HITAG};
 146
 147 //      param_get32ex(Cmd,1,0,16);
 148         UsbCommand c = {CMD_READER_HITAG};//, {param_get32ex(Cmd,0,0,10),param_get32ex(Cmd,1,0,16),param_get32ex(Cmd,2,0,16),param_get32ex(Cmd,3,0,16)}};
 149         hitag_data* htd = (hitag_data*)c.d.asBytes;
 150         hitag_function htf = param_get32ex(Cmd,0,0,10);
 151
 152         switch (htf) {
 153                 case RHT2F_PASSWORD: {
 154                         num_to_bytes(param_get32ex(Cmd,1,0,16),4,htd->pwd.password);
 155                 } break;
 156                 case RHT2F_AUTHENTICATE: {
 157                         num_to_bytes(param_get32ex(Cmd,1,0,16),4,htd->auth.NrAr);
 158                         num_to_bytes(param_get32ex(Cmd,2,0,16),4,htd->auth.NrAr+4);
 159                 } break;
 160                 case RHT2F_TEST_AUTH_ATTEMPTS: {
 161                         // No additional parameters needed
 162                 } break;
 163                 default: {
 164                         PrintAndLog("Error: unkown reader function %d",htf);
 165                         PrintAndLog("Hitag reader functions",htf);
 166                         PrintAndLog(" HitagS (0*)",htf);
 167                         PrintAndLog(" Hitag1 (1*)",htf);
 168                         PrintAndLog(" Hitag2 (2*)",htf);
 169                         PrintAndLog("  21 <password> (password mode)",htf);
 170                         PrintAndLog("  22 <nr> <ar> (authentication)",htf);
 171                         PrintAndLog("  25 (test recorded authentications)",htf);
 172                         return 1;
 173                 } break;
 174         }
 175
 176         // Copy the hitag2 function into the first argument
 177         c.arg[0] = htf;
 178
 179   SendCommand(&c);
 180   return 0;
 181 }
 182
 183 static command_t CommandTableHitag[] =
 184 {
 185   {"help",    CmdHelp,           1, "This help"},
 186   {"list",    CmdLFHitagList,    1, "List Hitag trace history"},
 187   {"reader",  CmdLFHitagReader,  1, "Act like a Hitag Reader"},
 188   {"sim",     CmdLFHitagSim,     1, "Simulate Hitag transponder"},
 189   {"snoop",   CmdLFHitagSnoop,   1, "Eavesdrop Hitag communication"},
 190                 {NULL, NULL, 0, NULL}
 191 };
 192
 193 int CmdLFHitag(const char *Cmd)
 194 {
 195   CmdsParse(CommandTableHitag, Cmd);
 196   return 0;
 197 }
 198
 199 int CmdHelp(const char *Cmd)
 200 {
 201   CmdsHelp(CommandTableHitag);
 202   return 0;
 203 }