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

   1 //-----------------------------------------------------------------------------
   2 // Copyright (C) 2010 iZsh <izsh at fail0verflow.com>
   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 commands
   9 //-----------------------------------------------------------------------------
  10
  11 #include <stdio.h>
  12 #include <stdlib.h>
  13 #include <string.h>
  14 #include <limits.h>
  15 //#include "proxusb.h"
  16 #include "proxmark3.h"
  17 #include "data.h"
  18 #include "graph.h"
  19 #include "ui.h"
  20 #include "cmdparser.h"
  21 #include "cmdmain.h"
  22 #include "cmddata.h"
  23 #include "cmdlf.h"
  24 #include "cmdlfhid.h"
  25 #include "cmdlfti.h"
  26 #include "cmdlfem4x.h"
  27 #include "cmdlfhitag.h"
  28 #include "cmdlft55xx.h"
  29 #include "cmdlfpcf7931.h"
  30 #include "cmdlfio.h"
  31
  32 static int CmdHelp(const char *Cmd);
  33
  34 /* send a command before reading */
  35 int CmdLFCommandRead(const char *Cmd)
  36 {
  37   static char dummy[3];
  38
  39   dummy[0]= ' ';
  40
  41   UsbCommand c = {CMD_MOD_THEN_ACQUIRE_RAW_ADC_SAMPLES_125K};
  42   sscanf(Cmd, "%"lli" %"lli" %"lli" %s %s", &c.arg[0], &c.arg[1], &c.arg[2],(char*)(&c.d.asBytes),(char*)(&dummy+1));
  43   // in case they specified 'h'
  44   strcpy((char *)&c.d.asBytes + strlen((char *)c.d.asBytes), dummy);
  45   SendCommand(&c);
  46   return 0;
  47 }
  48
  49 int CmdFlexdemod(const char *Cmd)
  50 {
  51   int i;
  52   for (i = 0; i < GraphTraceLen; ++i) {
  53     if (GraphBuffer[i] < 0) {
  54       GraphBuffer[i] = -1;
  55     } else {
  56       GraphBuffer[i] = 1;
  57     }
  58   }
  59
  60 #define LONG_WAIT 100
  61   int start;
  62   for (start = 0; start < GraphTraceLen - LONG_WAIT; start++) {
  63     int first = GraphBuffer[start];
  64     for (i = start; i < start + LONG_WAIT; i++) {
  65       if (GraphBuffer[i] != first) {
  66         break;
  67       }
  68     }
  69     if (i == (start + LONG_WAIT)) {
  70       break;
  71     }
  72   }
  73   if (start == GraphTraceLen - LONG_WAIT) {
  74     PrintAndLog("nothing to wait for");
  75     return 0;
  76   }
  77
  78   GraphBuffer[start] = 2;
  79   GraphBuffer[start+1] = -2;
  80
  81   uint8_t bits[64];
  82
  83   int bit;
  84   i = start;
  85   for (bit = 0; bit < 64; bit++) {
  86     int j;
  87     int sum = 0;
  88     for (j = 0; j < 16; j++) {
  89       sum += GraphBuffer[i++];
  90     }
  91     if (sum > 0) {
  92       bits[bit] = 1;
  93     } else {
  94       bits[bit] = 0;
  95     }
  96     PrintAndLog("bit %d sum %d", bit, sum);
  97   }
  98
  99   for (bit = 0; bit < 64; bit++) {
 100     int j;
 101     int sum = 0;
 102     for (j = 0; j < 16; j++) {
 103       sum += GraphBuffer[i++];
 104     }
 105     if (sum > 0 && bits[bit] != 1) {
 106       PrintAndLog("oops1 at %d", bit);
 107     }
 108     if (sum < 0 && bits[bit] != 0) {
 109       PrintAndLog("oops2 at %d", bit);
 110     }
 111   }
 112
 113   GraphTraceLen = 32*64;
 114   i = 0;
 115   int phase = 0;
 116   for (bit = 0; bit < 64; bit++) {
 117     if (bits[bit] == 0) {
 118       phase = 0;
 119     } else {
 120       phase = 1;
 121     }
 122     int j;
 123     for (j = 0; j < 32; j++) {
 124       GraphBuffer[i++] = phase;
 125       phase = !phase;
 126     }
 127   }
 128
 129   RepaintGraphWindow();
 130   return 0;
 131 }
 132
 133 int CmdIndalaDemod(const char *Cmd)
 134 {
 135   // Usage: recover 64bit UID by default, specify "224" as arg to recover a 224bit UID
 136
 137   int state = -1;
 138   int count = 0;
 139   int i, j;
 140   // worst case with GraphTraceLen=64000 is < 4096
 141   // under normal conditions it's < 2048
 142   uint8_t rawbits[4096];
 143   int rawbit = 0;
 144   int worst = 0, worstPos = 0;
 145   PrintAndLog("Expecting a bit less than %d raw bits", GraphTraceLen / 32);
 146   for (i = 0; i < GraphTraceLen-1; i += 2) {
 147     count += 1;
 148     if ((GraphBuffer[i] > GraphBuffer[i + 1]) && (state != 1)) {
 149       if (state == 0) {
 150         for (j = 0; j <  count - 8; j += 16) {
 151           rawbits[rawbit++] = 0;
 152         }
 153         if ((abs(count - j)) > worst) {
 154           worst = abs(count - j);
 155           worstPos = i;
 156         }
 157       }
 158       state = 1;
 159       count = 0;
 160     } else if ((GraphBuffer[i] < GraphBuffer[i + 1]) && (state != 0)) {
 161       if (state == 1) {
 162         for (j = 0; j <  count - 8; j += 16) {
 163           rawbits[rawbit++] = 1;
 164         }
 165         if ((abs(count - j)) > worst) {
 166           worst = abs(count - j);
 167           worstPos = i;
 168         }
 169       }
 170       state = 0;
 171       count = 0;
 172     }
 173   }
 174   PrintAndLog("Recovered %d raw bits", rawbit);
 175   PrintAndLog("worst metric (0=best..7=worst): %d at pos %d", worst, worstPos);
 176
 177   // Finding the start of a UID
 178   int uidlen, long_wait;
 179   if (strcmp(Cmd, "224") == 0) {
 180     uidlen = 224;
 181     long_wait = 30;
 182   } else {
 183     uidlen = 64;
 184     long_wait = 29;
 185   }
 186   int start;
 187   int first = 0;
 188   for (start = 0; start <= rawbit - uidlen; start++) {
 189     first = rawbits[start];
 190     for (i = start; i < start + long_wait; i++) {
 191       if (rawbits[i] != first) {
 192         break;
 193       }
 194     }
 195     if (i == (start + long_wait)) {
 196       break;
 197     }
 198   }
 199   if (start == rawbit - uidlen + 1) {
 200     PrintAndLog("nothing to wait for");
 201     return 0;
 202   }
 203
 204   // Inverting signal if needed
 205   if (first == 1) {
 206     for (i = start; i < rawbit; i++) {
 207       rawbits[i] = !rawbits[i];
 208     }
 209   }
 210
 211   // Dumping UID
 212   uint8_t bits[224];
 213   char showbits[225];
 214   showbits[uidlen]='\0';
 215   int bit;
 216   i = start;
 217   int times = 0;
 218   if (uidlen > rawbit) {
 219     PrintAndLog("Warning: not enough raw bits to get a full UID");
 220     for (bit = 0; bit < rawbit; bit++) {
 221       bits[bit] = rawbits[i++];
 222       // As we cannot know the parity, let's use "." and "/"
 223       showbits[bit] = '.' + bits[bit];
 224     }
 225     showbits[bit+1]='\0';
 226     PrintAndLog("Partial UID=%s", showbits);
 227     return 0;
 228   } else {
 229     for (bit = 0; bit < uidlen; bit++) {
 230       bits[bit] = rawbits[i++];
 231       showbits[bit] = '0' + bits[bit];
 232     }
 233     times = 1;
 234   }
 235
 236   //convert UID to HEX
 237   uint32_t uid1, uid2, uid3, uid4, uid5, uid6, uid7;
 238   int idx;
 239   uid1=0;
 240   uid2=0;
 241   if (uidlen==64){
 242     for( idx=0; idx<64; idx++) {
 243         if (showbits[idx] == '0') {
 244         uid1=(uid1<<1)|(uid2>>31);
 245         uid2=(uid2<<1)|0;
 246         } else {
 247         uid1=(uid1<<1)|(uid2>>31);
 248         uid2=(uid2<<1)|1;
 249         }
 250       }
 251     PrintAndLog("UID=%s (%x%08x)", showbits, uid1, uid2);
 252   }
 253   else {
 254     uid3=0;
 255     uid4=0;
 256     uid5=0;
 257     uid6=0;
 258     uid7=0;
 259     for( idx=0; idx<224; idx++) {
 260         uid1=(uid1<<1)|(uid2>>31);
 261         uid2=(uid2<<1)|(uid3>>31);
 262         uid3=(uid3<<1)|(uid4>>31);
 263         uid4=(uid4<<1)|(uid5>>31);
 264         uid5=(uid5<<1)|(uid6>>31);
 265         uid6=(uid6<<1)|(uid7>>31);
 266         if (showbits[idx] == '0') uid7=(uid7<<1)|0;
 267         else uid7=(uid7<<1)|1;
 268       }
 269     PrintAndLog("UID=%s (%x%08x%08x%08x%08x%08x%08x)", showbits, uid1, uid2, uid3, uid4, uid5, uid6, uid7);
 270   }
 271
 272   // Checking UID against next occurences
 273   for (; i + uidlen <= rawbit;) {
 274     int failed = 0;
 275     for (bit = 0; bit < uidlen; bit++) {
 276       if (bits[bit] != rawbits[i++]) {
 277         failed = 1;
 278         break;
 279       }
 280     }
 281     if (failed == 1) {
 282       break;
 283     }
 284     times += 1;
 285   }
 286   PrintAndLog("Occurences: %d (expected %d)", times, (rawbit - start) / uidlen);
 287
 288   // Remodulating for tag cloning
 289   GraphTraceLen = 32*uidlen;
 290   i = 0;
 291   int phase = 0;
 292   for (bit = 0; bit < uidlen; bit++) {
 293     if (bits[bit] == 0) {
 294       phase = 0;
 295     } else {
 296       phase = 1;
 297     }
 298     int j;
 299     for (j = 0; j < 32; j++) {
 300       GraphBuffer[i++] = phase;
 301       phase = !phase;
 302     }
 303   }
 304
 305   RepaintGraphWindow();
 306   return 0;
 307 }
 308
 309 int CmdIndalaClone(const char *Cmd)
 310 {
 311   unsigned int uid1, uid2, uid3, uid4, uid5, uid6, uid7;
 312   UsbCommand c;
 313   uid1=0;
 314   uid2=0;
 315   uid3=0;
 316   uid4=0;
 317   uid5=0;
 318   uid6=0;
 319   uid7=0;
 320   int n = 0, i = 0;
 321
 322   if (strchr(Cmd,'l') != 0) {
 323     while (sscanf(&Cmd[i++], "%1x", &n ) == 1) {
 324       uid1 = (uid1 << 4) | (uid2 >> 28);
 325       uid2 = (uid2 << 4) | (uid3 >> 28);
 326       uid3 = (uid3 << 4) | (uid4 >> 28);
 327       uid4 = (uid4 << 4) | (uid5 >> 28);
 328       uid5 = (uid5 << 4) | (uid6 >> 28);
 329       uid6 = (uid6 << 4) | (uid7 >> 28);
 330         uid7 = (uid7 << 4) | (n & 0xf);
 331     }
 332     PrintAndLog("Cloning 224bit tag with UID %x%08x%08x%08x%08x%08x%08x", uid1, uid2, uid3, uid4, uid5, uid6, uid7);
 333     c.cmd = CMD_INDALA_CLONE_TAG_L;
 334     c.d.asDwords[0] = uid1;
 335     c.d.asDwords[1] = uid2;
 336     c.d.asDwords[2] = uid3;
 337     c.d.asDwords[3] = uid4;
 338     c.d.asDwords[4] = uid5;
 339     c.d.asDwords[5] = uid6;
 340     c.d.asDwords[6] = uid7;
 341   }
 342   else
 343   {
 344     while (sscanf(&Cmd[i++], "%1x", &n ) == 1) {
 345       uid1 = (uid1 << 4) | (uid2 >> 28);
 346       uid2 = (uid2 << 4) | (n & 0xf);
 347     }
 348     PrintAndLog("Cloning 64bit tag with UID %x%08x", uid1, uid2);
 349     c.cmd = CMD_INDALA_CLONE_TAG;
 350     c.arg[0] = uid1;
 351     c.arg[1] = uid2;
 352   }
 353
 354   SendCommand(&c);
 355   return 0;
 356 }
 357
 358 int CmdLFRead(const char *Cmd)
 359 {
 360   UsbCommand c = {CMD_ACQUIRE_RAW_ADC_SAMPLES_125K};
 361   // 'h' means higher-low-frequency, 134 kHz
 362   if(*Cmd == 'h') {
 363     c.arg[0] = 1;
 364   } else if (*Cmd == '\0') {
 365     c.arg[0] = 0;
 366   } else if (sscanf(Cmd, "%"lli, &c.arg[0]) != 1) {
 367     PrintAndLog("use 'read' or 'read h', or 'read <divisor>'");
 368     return 0;
 369   }
 370   SendCommand(&c);
 371   WaitForResponse(CMD_ACK,NULL);
 372   return 0;
 373 }
 374
 375 static void ChkBitstream(const char *str)
 376 {
 377   int i;
 378
 379   /* convert to bitstream if necessary */
 380   for (i = 0; i < (int)(GraphTraceLen / 2); i++)
 381   {
 382     if (GraphBuffer[i] > 1 || GraphBuffer[i] < 0)
 383     {
 384       CmdBitstream(str);
 385       break;
 386     }
 387   }
 388 }
 389
 390 int CmdLFSim(const char *Cmd)
 391 {
 392   int i;
 393   static int gap;
 394
 395   sscanf(Cmd, "%i", &gap);
 396
 397   /* convert to bitstream if necessary */
 398   ChkBitstream(Cmd);
 399
 400   PrintAndLog("Sending data, please wait...");
 401   for (i = 0; i < GraphTraceLen; i += 48) {
 402     UsbCommand c={CMD_DOWNLOADED_SIM_SAMPLES_125K, {i, 0, 0}};
 403     int j;
 404     for (j = 0; j < 48; j++) {
 405       c.d.asBytes[j] = GraphBuffer[i+j];
 406     }
 407     SendCommand(&c);
 408     WaitForResponse(CMD_ACK,NULL);
 409   }
 410
 411   PrintAndLog("Starting simulator...");
 412   UsbCommand c = {CMD_SIMULATE_TAG_125K, {GraphTraceLen, gap, 0}};
 413   SendCommand(&c);
 414   return 0;
 415 }
 416
 417 int CmdLFSimBidir(const char *Cmd)
 418 {
 419   /* Set ADC to twice the carrier for a slight supersampling */
 420   UsbCommand c = {CMD_LF_SIMULATE_BIDIR, {47, 384, 0}};
 421   SendCommand(&c);
 422   return 0;
 423 }
 424
 425 /* simulate an LF Manchester encoded tag with specified bitstream, clock rate and inter-id gap */
 426 int CmdLFSimManchester(const char *Cmd)
 427 {
 428   static int clock, gap;
 429   static char data[1024], gapstring[8];
 430
 431   /* get settings/bits */
 432   sscanf(Cmd, "%i %s %i", &clock, &data[0], &gap);
 433
 434   /* clear our graph */
 435   ClearGraph(0);
 436
 437   /* fill it with our bitstream */
 438   for (int i = 0; i < strlen(data) ; ++i)
 439     AppendGraph(0, clock, data[i]- '0');
 440
 441   /* modulate */
 442   CmdManchesterMod("");
 443
 444   /* show what we've done */
 445   RepaintGraphWindow();
 446
 447   /* simulate */
 448   sprintf(&gapstring[0], "%i", gap);
 449   CmdLFSim(gapstring);
 450   return 0;
 451 }
 452
 453 int CmdVchDemod(const char *Cmd)
 454 {
 455   // Is this the entire sync pattern, or does this also include some
 456   // data bits that happen to be the same everywhere? That would be
 457   // lovely to know.
 458   static const int SyncPattern[] = {
 459     1,  1,  1,  1,  1,  1,  1,  1,  1,  1,  1,  1,  1,  1,  1,  1,
 460     1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
 461     1,  1,  1,  1,  1,  1,  1,  1,  1,  1,  1,  1,  1,  1,  1,  1,
 462     1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
 463     1,  1,  1,  1,  1,  1,  1,  1,  1,  1,  1,  1,  1,  1,  1,  1,
 464     1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
 465     1,  1,  1,  1,  1,  1,  1,  1,  1,  1,  1,  1,  1,  1,  1,  1,
 466     1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
 467     1,  1,  1,  1,  1,  1,  1,  1,  1,  1,  1,  1,  1,  1,  1,  1,
 468     1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
 469   };
 470
 471   // So first, we correlate for the sync pattern, and mark that.
 472   int bestCorrel = 0, bestPos = 0;
 473   int i;
 474   // It does us no good to find the sync pattern, with fewer than
 475   // 2048 samples after it...
 476   for (i = 0; i < (GraphTraceLen-2048); i++) {
 477     int sum = 0;
 478     int j;
 479     for (j = 0; j < arraylen(SyncPattern); j++) {
 480       sum += GraphBuffer[i+j]*SyncPattern[j];
 481     }
 482     if (sum > bestCorrel) {
 483       bestCorrel = sum;
 484       bestPos = i;
 485     }
 486   }
 487   PrintAndLog("best sync at %d [metric %d]", bestPos, bestCorrel);
 488
 489   char bits[257];
 490   bits[256] = '\0';
 491
 492   int worst = INT_MAX;
 493   int worstPos = 0;
 494
 495   for (i = 0; i < 2048; i += 8) {
 496     int sum = 0;
 497     int j;
 498     for (j = 0; j < 8; j++) {
 499       sum += GraphBuffer[bestPos+i+j];
 500     }
 501     if (sum < 0) {
 502       bits[i/8] = '.';
 503     } else {
 504       bits[i/8] = '1';
 505     }
 506     if(abs(sum) < worst) {
 507       worst = abs(sum);
 508       worstPos = i;
 509     }
 510   }
 511   PrintAndLog("bits:");
 512   PrintAndLog("%s", bits);
 513   PrintAndLog("worst metric: %d at pos %d", worst, worstPos);
 514
 515   if (strcmp(Cmd, "clone")==0) {
 516     GraphTraceLen = 0;
 517     char *s;
 518     for(s = bits; *s; s++) {
 519       int j;
 520       for(j = 0; j < 16; j++) {
 521         GraphBuffer[GraphTraceLen++] = (*s == '1') ? 1 : 0;
 522       }
 523     }
 524     RepaintGraphWindow();
 525   }
 526   return 0;
 527 }
 528
 529 static command_t CommandTable[] =
 530 {
 531   {"help",        CmdHelp,            1, "This help"},
 532   {"cmdread",     CmdLFCommandRead,   0, "<off period> <'0' period> <'1' period> <command> ['h'] -- Modulate LF reader field to send command before read (all periods in microseconds) (option 'h' for 134)"},
 533   {"em4x",        CmdLFEM4X,          1, "{ EM4X RFIDs... }"},
 534   {"flexdemod",   CmdFlexdemod,       1, "Demodulate samples for FlexPass"},
 535   {"hid",         CmdLFHID,           1, "{ HID RFIDs... }"},
 536   {"io",          CmdLFIO,            1, "{ ioProx tags... }"},
 537   {"indalademod", CmdIndalaDemod,     1, "['224'] -- Demodulate samples for Indala 64 bit UID (option '224' for 224 bit)"},
 538   {"indalaclone", CmdIndalaClone,     1, "<UID> ['l']-- Clone Indala to T55x7 (tag must be in antenna)(UID in HEX)(option 'l' for 224 UID"},
 539   {"read",        CmdLFRead,          0, "['h' or <divisor>] -- Read 125/134 kHz LF ID-only tag (option 'h' for 134, alternatively: f=12MHz/(divisor+1))"},
 540   {"sim",         CmdLFSim,           0, "[GAP] -- Simulate LF tag from buffer with optional GAP (in microseconds)"},
 541   {"simbidir",    CmdLFSimBidir,      0, "Simulate LF tag (with bidirectional data transmission between reader and tag)"},
 542   {"simman",      CmdLFSimManchester, 0, "<Clock> <Bitstream> [GAP] Simulate arbitrary Manchester LF tag"},
 543   {"ti",          CmdLFTI,            1, "{ TI RFIDs... }"},
 544   {"hitag",       CmdLFHitag,         1, "{ Hitag tags and transponders... }"},
 545   {"vchdemod",    CmdVchDemod,        1, "['clone'] -- Demodulate samples for VeriChip"},
 546   {"t55xx",       CmdLFT55XX,         1, "{ T55xx RFIDs... }"},
 547   {"pcf7931",     CmdLFPCF7931,       1, "{PCF7931 RFIDs...}"},
 548   {NULL, NULL, 0, NULL}
 549 };
 550
 551 int CmdLF(const char *Cmd)
 552 {
 553   CmdsParse(CommandTable, Cmd);
 554   return 0;
 555 }
 556
 557 int CmdHelp(const char *Cmd)
 558 {
 559   CmdsHelp(CommandTable);
 560   return 0;
 561 }