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

   1 //-----------------------------------------------------------------------------
   2 // Copyright (C) 2010 iZsh <izsh at fail0verflow.com>, Hagen Fritsch
   3 // Copyright (C) 2011 Gerhard de Koning Gans
   4 //
   5 // This code is licensed to you under the terms of the GNU GPL, version 2 or,
   6 // at your option, any later version. See the LICENSE.txt file for the text of
   7 // the license.
   8 //-----------------------------------------------------------------------------
   9 // High frequency iClass commands
  10 //-----------------------------------------------------------------------------
  11
  12 #include <stdio.h>
  13 #include <stdlib.h>
  14 #include <string.h>
  15 #include "iso14443crc.h" // Can also be used for iClass, using 0xE012 as CRC-type
  16 #include "data.h"
  17 #include "proxusb.h"
  18 #include "ui.h"
  19 #include "cmdparser.h"
  20 #include "cmdhficlass.h"
  21 #include "common.h"
  22
  23 static int CmdHelp(const char *Cmd);
  24
  25 int CmdHFiClassList(const char *Cmd)
  26 {
  27   uint8_t got[1920];
  28   GetFromBigBuf(got, sizeof(got));
  29
  30   PrintAndLog("recorded activity:");
  31   PrintAndLog(" ETU     :rssi: who bytes");
  32   PrintAndLog("---------+----+----+-----------");
  33
  34   int i = 0;
  35   int prev = -1;
  36
  37   for (;;) {
  38     if(i >= 1900) {
  39       break;
  40     }
  41
  42     bool isResponse;
  43     int timestamp = *((uint32_t *)(got+i));
  44     if (timestamp & 0x80000000) {
  45       timestamp &= 0x7fffffff;
  46       isResponse = 1;
  47     } else {
  48       isResponse = 0;
  49     }
  50
  51     int metric = 0;
  52     int parityBits = *((uint32_t *)(got+i+4));
  53     // 4 bytes of additional information...
  54     // maximum of 32 additional parity bit information
  55     //
  56     // TODO:
  57     // at each quarter bit period we can send power level (16 levels)
  58     // or each half bit period in 256 levels.
  59
  60
  61     int len = got[i+8];
  62
  63     if (len > 100) {
  64       break;
  65     }
  66     if (i + len >= 1900) {
  67       break;
  68     }
  69
  70     uint8_t *frame = (got+i+9);
  71
  72     // Break and stick with current result if buffer was not completely full
  73     if (frame[0] == 0x44 && frame[1] == 0x44 && frame[3] == 0x44) { break; }
  74
  75     char line[1000] = "";
  76     int j;
  77     for (j = 0; j < len; j++) {
  78       int oddparity = 0x01;
  79       int k;
  80
  81       for (k=0;k<8;k++) {
  82         oddparity ^= (((frame[j] & 0xFF) >> k) & 0x01);
  83       }
  84
  85       //if((parityBits >> (len - j - 1)) & 0x01) {
  86       if (isResponse && (oddparity != ((parityBits >> (len - j - 1)) & 0x01))) {
  87         sprintf(line+(j*4), "%02x!  ", frame[j]);
  88       }
  89       else {
  90         sprintf(line+(j*4), "%02x   ", frame[j]);
  91       }
  92     }
  93
  94     char *crc;
  95     crc = "";
  96     if (len > 2) {
  97       uint8_t b1, b2;
  98       for (j = 0; j < (len - 1); j++) {
  99         // gives problems... search for the reason..
 100         /*if(frame[j] == 0xAA) {
 101           switch(frame[j+1]) {
 102             case 0x01:
 103               crc = "[1] Two drops close after each other";
 104             break;
 105             case 0x02:
 106               crc = "[2] Potential SOC with a drop in second half of bitperiod";
 107               break;
 108             case 0x03:
 109               crc = "[3] Segment Z after segment X is not possible";
 110               break;
 111             case 0x04:
 112               crc = "[4] Parity bit of a fully received byte was wrong";
 113               break;
 114             default:
 115               crc = "[?] Unknown error";
 116               break;
 117           }
 118           break;
 119         }*/
 120       }
 121
 122       if (strlen(crc)==0) {
 123         if(!isResponse && len == 4) {
 124                 // Rough guess that this is a command from the reader
 125                 // For iClass the command byte is not part of the CRC
 126                 ComputeCrc14443(CRC_ICLASS, &frame[1], len-3, &b1, &b2);
 127         }
 128         else {
 129                 // For other data.. CRC might not be applicable (UPDATE commands etc.)
 130                 ComputeCrc14443(CRC_ICLASS, frame, len-2, &b1, &b2);
 131         }
 132         //printf("%1x %1x",(unsigned)b1,(unsigned)b2);
 133         if (b1 != frame[len-2] || b2 != frame[len-1]) {
 134           crc = (isResponse & (len < 8)) ? "" : " !crc";
 135         } else {
 136           crc = "";
 137         }
 138       }
 139     } else {
 140       crc = ""; // SHORT
 141     }
 142
 143     char metricString[100];
 144     if (isResponse) {
 145       sprintf(metricString, "%3d", metric);
 146     } else {
 147       strcpy(metricString, "   ");
 148     }
 149
 150     PrintAndLog(" +%7d: %s: %s %s %s",
 151       (prev < 0 ? 0 : (timestamp - prev)),
 152       metricString,
 153       (isResponse ? "TAG" : "   "), line, crc);
 154
 155     prev = timestamp;
 156     i += (len + 9);
 157   }
 158   return 0;
 159 }
 160
 161 /*void iso14a_set_timeout(uint32_t timeout) {
 162         UsbCommand c = {CMD_READER_ISO_14443a, {ISO14A_SET_TIMEOUT, 0, timeout}};
 163         SendCommand(&c);
 164 }*/
 165
 166 int CmdHFiClassSnoop(const char *Cmd)
 167 {
 168   UsbCommand c = {CMD_SNOOP_ICLASS};
 169   SendCommand(&c);
 170   return 0;
 171 }
 172
 173 static command_t CommandTable[] =
 174 {
 175   {"help",    CmdHelp,        1, "This help"},
 176   {"list",    CmdHFiClassList,   0, "List iClass history"},
 177   {"snoop",   CmdHFiClassSnoop,  0, "Eavesdrop iClass communication"},
 178   {NULL, NULL, 0, NULL}
 179 };
 180
 181 int CmdHFiClass(const char *Cmd)
 182 {
 183   CmdsParse(CommandTable, Cmd);
 184   return 0;
 185 }
 186
 187 int CmdHelp(const char *Cmd)
 188 {
 189   CmdsHelp(CommandTable);
 190   return 0;
 191 }