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 "proxmark3.h"
  16 #include "data.h"
  17 #include "graph.h"
  18 #include "ui.h"
  19 #include "cmdparser.h"
  20 #include "cmdmain.h"
  21 #include "cmddata.h"
  22 #include "util.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         uint8_t bits[64] = {0x00};
  81
  82         int bit, sum;
  83   i = start;
  84   for (bit = 0; bit < 64; bit++) {
  85                 sum = 0;
  86                 for (int j = 0; j < 16; j++) {
  87       sum += GraphBuffer[i++];
  88     }
  89
  90                 bits[bit] = (sum > 0) ? 1 : 0;
  91
  92     PrintAndLog("bit %d sum %d", bit, sum);
  93   }
  94
  95   for (bit = 0; bit < 64; bit++) {
  96     int j;
  97     int sum = 0;
  98     for (j = 0; j < 16; j++) {
  99       sum += GraphBuffer[i++];
 100     }
 101     if (sum > 0 && bits[bit] != 1) {
 102       PrintAndLog("oops1 at %d", bit);
 103     }
 104     if (sum < 0 && bits[bit] != 0) {
 105       PrintAndLog("oops2 at %d", bit);
 106     }
 107   }
 108
 109         // HACK writing back to graphbuffer.
 110   GraphTraceLen = 32*64;
 111   i = 0;
 112   int phase = 0;
 113   for (bit = 0; bit < 64; bit++) {
 114
 115                 phase = (bits[bit] == 0) ? 0 : 1;
 116
 117     int j;
 118     for (j = 0; j < 32; j++) {
 119       GraphBuffer[i++] = phase;
 120       phase = !phase;
 121     }
 122   }
 123
 124   RepaintGraphWindow();
 125   return 0;
 126 }
 127
 128 int CmdIndalaDemod(const char *Cmd)
 129 {
 130   // Usage: recover 64bit UID by default, specify "224" as arg to recover a 224bit UID
 131
 132   int state = -1;
 133   int count = 0;
 134   int i, j;
 135
 136   // worst case with GraphTraceLen=64000 is < 4096
 137   // under normal conditions it's < 2048
 138
 139   uint8_t rawbits[4096];
 140   int rawbit = 0;
 141   int worst = 0, worstPos = 0;
 142  // PrintAndLog("Expecting a bit less than %d raw bits", GraphTraceLen / 32);
 143   for (i = 0; i < GraphTraceLen-1; i += 2) {
 144     count += 1;
 145     if ((GraphBuffer[i] > GraphBuffer[i + 1]) && (state != 1)) {
 146       if (state == 0) {
 147         for (j = 0; j <  count - 8; j += 16) {
 148           rawbits[rawbit++] = 0;
 149         }
 150         if ((abs(count - j)) > worst) {
 151           worst = abs(count - j);
 152           worstPos = i;
 153         }
 154       }
 155       state = 1;
 156       count = 0;
 157     } else if ((GraphBuffer[i] < GraphBuffer[i + 1]) && (state != 0)) {
 158       if (state == 1) {
 159         for (j = 0; j <  count - 8; j += 16) {
 160           rawbits[rawbit++] = 1;
 161         }
 162         if ((abs(count - j)) > worst) {
 163           worst = abs(count - j);
 164           worstPos = i;
 165         }
 166       }
 167       state = 0;
 168       count = 0;
 169     }
 170   }
 171
 172   if (rawbit>0){
 173     PrintAndLog("Recovered %d raw bits, expected: %d", rawbit, GraphTraceLen/32);
 174     PrintAndLog("worst metric (0=best..7=worst): %d at pos %d", worst, worstPos);
 175         } else {
 176                 return 0;
 177         }
 178
 179   // Finding the start of a UID
 180   int uidlen, long_wait;
 181   if (strcmp(Cmd, "224") == 0) {
 182     uidlen = 224;
 183     long_wait = 30;
 184   } else {
 185     uidlen = 64;
 186     long_wait = 29;
 187   }
 188
 189   int start;
 190   int first = 0;
 191   for (start = 0; start <= rawbit - uidlen; start++) {
 192     first = rawbits[start];
 193     for (i = start; i < start + long_wait; i++) {
 194       if (rawbits[i] != first) {
 195         break;
 196       }
 197     }
 198     if (i == (start + long_wait)) {
 199       break;
 200     }
 201   }
 202
 203   if (start == rawbit - uidlen + 1) {
 204     PrintAndLog("nothing to wait for");
 205     return 0;
 206   }
 207
 208   // Inverting signal if needed
 209   if (first == 1) {
 210     for (i = start; i < rawbit; i++) {
 211       rawbits[i] = !rawbits[i];
 212     }
 213   }
 214
 215   // Dumping UID
 216         uint8_t bits[224] = {0x00};
 217         char showbits[225] = {0x00};
 218   int bit;
 219   i = start;
 220   int times = 0;
 221
 222   if (uidlen > rawbit) {
 223     PrintAndLog("Warning: not enough raw bits to get a full UID");
 224     for (bit = 0; bit < rawbit; bit++) {
 225       bits[bit] = rawbits[i++];
 226       // As we cannot know the parity, let's use "." and "/"
 227       showbits[bit] = '.' + bits[bit];
 228     }
 229     showbits[bit+1]='\0';
 230     PrintAndLog("Partial UID=%s", showbits);
 231     return 0;
 232   } else {
 233     for (bit = 0; bit < uidlen; bit++) {
 234       bits[bit] = rawbits[i++];
 235       showbits[bit] = '0' + bits[bit];
 236     }
 237     times = 1;
 238   }
 239
 240   //convert UID to HEX
 241   uint32_t uid1, uid2, uid3, uid4, uid5, uid6, uid7;
 242   int idx;
 243         uid1 = uid2 = 0;
 244
 245   if (uidlen==64){
 246     for( idx=0; idx<64; idx++) {
 247         if (showbits[idx] == '0') {
 248         uid1=(uid1<<1)|(uid2>>31);
 249         uid2=(uid2<<1)|0;
 250         } else {
 251         uid1=(uid1<<1)|(uid2>>31);
 252         uid2=(uid2<<1)|1;
 253         }
 254       }
 255     PrintAndLog("UID=%s (%x%08x)", showbits, uid1, uid2);
 256   }
 257   else {
 258                 uid3 = uid4 = uid5 = uid6 = uid7 = 0;
 259
 260     for( idx=0; idx<224; idx++) {
 261         uid1=(uid1<<1)|(uid2>>31);
 262         uid2=(uid2<<1)|(uid3>>31);
 263         uid3=(uid3<<1)|(uid4>>31);
 264         uid4=(uid4<<1)|(uid5>>31);
 265         uid5=(uid5<<1)|(uid6>>31);
 266         uid6=(uid6<<1)|(uid7>>31);
 267
 268                         if (showbits[idx] == '0')
 269                                 uid7 = (uid7<<1) | 0;
 270                         else
 271                                 uid7 = (uid7<<1) | 1;
 272       }
 273     PrintAndLog("UID=%s (%x%08x%08x%08x%08x%08x%08x)", showbits, uid1, uid2, uid3, uid4, uid5, uid6, uid7);
 274   }
 275
 276   // Checking UID against next occurrences
 277     int failed = 0;
 278         for (; i + uidlen <= rawbit;) {
 279                 failed = 0;
 280     for (bit = 0; bit < uidlen; bit++) {
 281       if (bits[bit] != rawbits[i++]) {
 282         failed = 1;
 283         break;
 284       }
 285     }
 286     if (failed == 1) {
 287       break;
 288     }
 289     times += 1;
 290   }
 291
 292   PrintAndLog("Occurrences: %d (expected %d)", times, (rawbit - start) / uidlen);
 293
 294   // Remodulating for tag cloning
 295         // HACK: 2015-01-04 this will have an impact on our new way of seening lf commands (demod)
 296         // since this changes graphbuffer data.
 297   GraphTraceLen = 32*uidlen;
 298   i = 0;
 299   int phase = 0;
 300   for (bit = 0; bit < uidlen; bit++) {
 301     if (bits[bit] == 0) {
 302       phase = 0;
 303     } else {
 304       phase = 1;
 305     }
 306     int j;
 307     for (j = 0; j < 32; j++) {
 308       GraphBuffer[i++] = phase;
 309       phase = !phase;
 310     }
 311   }
 312
 313   RepaintGraphWindow();
 314   return 1;
 315 }
 316
 317 int CmdIndalaClone(const char *Cmd)
 318 {
 319   UsbCommand c;
 320         unsigned int uid1, uid2, uid3, uid4, uid5, uid6, uid7;
 321
 322         uid1 =  uid2 = uid3 = uid4 = uid5 = uid6 = uid7 = 0;
 323   int n = 0, i = 0;
 324
 325   if (strchr(Cmd,'l') != 0) {
 326     while (sscanf(&Cmd[i++], "%1x", &n ) == 1) {
 327       uid1 = (uid1 << 4) | (uid2 >> 28);
 328       uid2 = (uid2 << 4) | (uid3 >> 28);
 329       uid3 = (uid3 << 4) | (uid4 >> 28);
 330       uid4 = (uid4 << 4) | (uid5 >> 28);
 331       uid5 = (uid5 << 4) | (uid6 >> 28);
 332       uid6 = (uid6 << 4) | (uid7 >> 28);
 333         uid7 = (uid7 << 4) | (n & 0xf);
 334     }
 335     PrintAndLog("Cloning 224bit tag with UID %x%08x%08x%08x%08x%08x%08x", uid1, uid2, uid3, uid4, uid5, uid6, uid7);
 336     c.cmd = CMD_INDALA_CLONE_TAG_L;
 337     c.d.asDwords[0] = uid1;
 338     c.d.asDwords[1] = uid2;
 339     c.d.asDwords[2] = uid3;
 340     c.d.asDwords[3] = uid4;
 341     c.d.asDwords[4] = uid5;
 342     c.d.asDwords[5] = uid6;
 343     c.d.asDwords[6] = uid7;
 344         } else {
 345     while (sscanf(&Cmd[i++], "%1x", &n ) == 1) {
 346       uid1 = (uid1 << 4) | (uid2 >> 28);
 347       uid2 = (uid2 << 4) | (n & 0xf);
 348     }
 349     PrintAndLog("Cloning 64bit tag with UID %x%08x", uid1, uid2);
 350     c.cmd = CMD_INDALA_CLONE_TAG;
 351     c.arg[0] = uid1;
 352     c.arg[1] = uid2;
 353   }
 354
 355   SendCommand(&c);
 356   return 0;
 357 }
 358
 359 int CmdLFRead(const char *Cmd)
 360 {
 361   UsbCommand c = {CMD_ACQUIRE_RAW_ADC_SAMPLES_125K};
 362
 363   // 'h' means higher-low-frequency, 134 kHz
 364   if(*Cmd == 'h') {
 365     c.arg[0] = 1;
 366   } else if (*Cmd == '\0') {
 367     c.arg[0] = 0;
 368   } else if (sscanf(Cmd, "%"lli, &c.arg[0]) != 1) {
 369                 PrintAndLog("Samples 1: 'lf read'");
 370                 PrintAndLog("        2: 'lf read h'");
 371                 PrintAndLog("        3: 'lf read <divisor>'");
 372     return 0;
 373   }
 374   SendCommand(&c);
 375   WaitForResponse(CMD_ACK,NULL);
 376   return 0;
 377 }
 378
 379 static void ChkBitstream(const char *str)
 380 {
 381   int i;
 382
 383   /* convert to bitstream if necessary */
 384         for (i = 0; i < (int)(GraphTraceLen / 2); i++){
 385                 if (GraphBuffer[i] > 1 || GraphBuffer[i] < 0) {
 386       CmdBitstream(str);
 387       break;
 388     }
 389   }
 390 }
 391
 392 int CmdLFSim(const char *Cmd)
 393 {
 394         int i,j;
 395   static int gap;
 396
 397   sscanf(Cmd, "%i", &gap);
 398
 399   /* convert to bitstream if necessary */
 400   ChkBitstream(Cmd);
 401
 402         printf("Sending [%d bytes]", GraphTraceLen);
 403         for (i = 0; i < GraphTraceLen; i += USB_CMD_DATA_SIZE) {
 404     UsbCommand c={CMD_DOWNLOADED_SIM_SAMPLES_125K, {i, 0, 0}};
 405
 406                 for (j = 0; j < USB_CMD_DATA_SIZE; j++) {
 407       c.d.asBytes[j] = GraphBuffer[i+j];
 408     }
 409     SendCommand(&c);
 410     WaitForResponse(CMD_ACK,NULL);
 411                 printf(".");
 412   }
 413
 414         printf("\n");
 415         PrintAndLog("Starting to simulate");
 416   UsbCommand c = {CMD_SIMULATE_TAG_125K, {GraphTraceLen, gap, 0}};
 417   SendCommand(&c);
 418   return 0;
 419 }
 420
 421 int CmdLFSimBidir(const char *Cmd)
 422 {
 423   // Set ADC to twice the carrier for a slight supersampling
 424   // HACK: not implemented in ARMSRC.
 425   PrintAndLog("Not implemented yet.");
 426   UsbCommand c = {CMD_LF_SIMULATE_BIDIR, {47, 384, 0}};
 427   SendCommand(&c);
 428   return 0;
 429 }
 430
 431 /* simulate an LF Manchester encoded tag with specified bitstream, clock rate and inter-id gap */
 432 int CmdLFSimManchester(const char *Cmd)
 433 {
 434   static int clock, gap;
 435   static char data[1024], gapstring[8];
 436
 437   sscanf(Cmd, "%i %s %i", &clock, &data[0], &gap);
 438
 439   ClearGraph(0);
 440
 441   for (int i = 0; i < strlen(data) ; ++i)
 442     AppendGraph(0, clock, data[i]- '0');
 443
 444   CmdManchesterMod("");
 445
 446   RepaintGraphWindow();
 447
 448   sprintf(&gapstring[0], "%i", gap);
 449   CmdLFSim(gapstring);
 450   return 0;
 451 }
 452
 453 int CmdLFSnoop(const char *Cmd)
 454 {
 455   UsbCommand c = {CMD_LF_SNOOP_RAW_ADC_SAMPLES};
 456
 457   // 'h' means higher-low-frequency, 134 kHz
 458   c.arg[0] = 0;
 459   c.arg[1] = -1;
 460
 461         if (*Cmd == 'l') {
 462     sscanf(Cmd, "l %"lli, &c.arg[1]);
 463   } else if(*Cmd == 'h') {
 464     c.arg[0] = 1;
 465     sscanf(Cmd, "h %"lli, &c.arg[1]);
 466   } else if (sscanf(Cmd, "%"lli" %"lli, &c.arg[0], &c.arg[1]) < 1) {
 467                 PrintAndLog("usage 1:  snoop");
 468                 PrintAndLog("      2:  snoop {l,h} [trigger threshold]");
 469                 PrintAndLog("      3:  snoop <divisor> [trigger threshold]");
 470     return 0;
 471   }
 472
 473   SendCommand(&c);
 474   WaitForResponse(CMD_ACK,NULL);
 475   return 0;
 476 }
 477
 478 int CmdVchDemod(const char *Cmd)
 479 {
 480   // Is this the entire sync pattern, or does this also include some
 481   // data bits that happen to be the same everywhere? That would be
 482   // lovely to know.
 483   static const int SyncPattern[] = {
 484     1,  1,  1,  1,  1,  1,  1,  1,  1,  1,  1,  1,  1,  1,  1,  1,
 485     1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
 486     1,  1,  1,  1,  1,  1,  1,  1,  1,  1,  1,  1,  1,  1,  1,  1,
 487     1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
 488     1,  1,  1,  1,  1,  1,  1,  1,  1,  1,  1,  1,  1,  1,  1,  1,
 489     1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
 490     1,  1,  1,  1,  1,  1,  1,  1,  1,  1,  1,  1,  1,  1,  1,  1,
 491     1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
 492     1,  1,  1,  1,  1,  1,  1,  1,  1,  1,  1,  1,  1,  1,  1,  1,
 493     1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
 494   };
 495
 496   // So first, we correlate for the sync pattern, and mark that.
 497   int bestCorrel = 0, bestPos = 0;
 498   int i;
 499   // It does us no good to find the sync pattern, with fewer than
 500   // 2048 samples after it...
 501   for (i = 0; i < (GraphTraceLen-2048); i++) {
 502     int sum = 0;
 503     int j;
 504     for (j = 0; j < arraylen(SyncPattern); j++) {
 505       sum += GraphBuffer[i+j]*SyncPattern[j];
 506     }
 507     if (sum > bestCorrel) {
 508       bestCorrel = sum;
 509       bestPos = i;
 510     }
 511   }
 512   PrintAndLog("best sync at %d [metric %d]", bestPos, bestCorrel);
 513
 514   char bits[257];
 515   bits[256] = '\0';
 516
 517   int worst = INT_MAX;
 518   int worstPos = 0;
 519
 520   for (i = 0; i < 2048; i += 8) {
 521     int sum = 0;
 522     int j;
 523     for (j = 0; j < 8; j++) {
 524       sum += GraphBuffer[bestPos+i+j];
 525     }
 526     if (sum < 0) {
 527       bits[i/8] = '.';
 528     } else {
 529       bits[i/8] = '1';
 530     }
 531     if(abs(sum) < worst) {
 532       worst = abs(sum);
 533       worstPos = i;
 534     }
 535   }
 536   PrintAndLog("bits:");
 537   PrintAndLog("%s", bits);
 538   PrintAndLog("worst metric: %d at pos %d", worst, worstPos);
 539
 540   if (strcmp(Cmd, "clone")==0) {
 541     GraphTraceLen = 0;
 542     char *s;
 543     for(s = bits; *s; s++) {
 544       int j;
 545       for(j = 0; j < 16; j++) {
 546         GraphBuffer[GraphTraceLen++] = (*s == '1') ? 1 : 0;
 547       }
 548     }
 549     RepaintGraphWindow();
 550   }
 551   return 0;
 552 }
 553
 554 //by marshmellow
 555 int CmdLFfind(const char *Cmd)
 556 {
 557   int ans=0;
 558         char cmdp = param_getchar(Cmd, 0);
 559
 560         if (strlen(Cmd) > 1 || cmdp == 'h' || cmdp == 'H') {
 561                 PrintAndLog("Usage:  lf search <0|1>");
 562                 PrintAndLog("     <use data from Graphbuffer>, if not set, try reading data from tag.");
 563                 PrintAndLog("");
 564                 PrintAndLog("    sample: lf search");
 565                 PrintAndLog("          : lf search 1");
 566                 return 0;
 567         }
 568
 569         if (!offline && (cmdp != '1')){
 570     ans=CmdLFRead("");
 571     ans=CmdSamples("20000");
 572         } else if (GraphTraceLen < 1000) {
 573                 PrintAndLog("Data in Graphbuffer was too small.");
 574                 return 0;
 575   }
 576
 577   PrintAndLog("NOTE: some demods output possible binary\n  if it finds something that looks like a tag");
 578   PrintAndLog("Checking for known tags:");
 579   ans=CmdFSKdemodIO("");
 580   if (ans>0) {
 581     PrintAndLog("Valid IO Prox ID Found!");
 582     return 1;
 583   }
 584   ans=CmdFSKdemodHID("");
 585   if (ans>0) {
 586     PrintAndLog("Valid HID Prox ID Found!");
 587     return 1;
 588   }
 589   //add psk and indala
 590   ans=CmdIndalaDecode("0");
 591   if (ans>0) {
 592     PrintAndLog("Valid Indala ID Found!");
 593     return 1;
 594   }
 595   ans=Cmdaskmandemod("");
 596   if (ans>0) {
 597     PrintAndLog("Valid EM410x ID Found!");
 598     return 1;
 599   }
 600   PrintAndLog("No Known Tags Found!\n");
 601   return 0;
 602 }
 603
 604 static command_t CommandTable[] =
 605 {
 606   {"help",        CmdHelp,            1, "This help"},
 607   {"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)"},
 608   {"em4x",        CmdLFEM4X,          1, "{ EM4X RFIDs... }"},
 609   {"flexdemod",   CmdFlexdemod,       1, "Demodulate samples for FlexPass"},
 610   {"hid",         CmdLFHID,           1, "{ HID RFIDs... }"},
 611   {"io",          CmdLFIO,                1, "{ ioProx tags... }"},
 612   {"indalademod", CmdIndalaDemod,     1, "['224'] -- Demodulate samples for Indala 64 bit UID (option '224' for 224 bit)"},
 613   {"indalaclone", CmdIndalaClone,     0, "<UID> ['l']-- Clone Indala to T55x7 (tag must be in antenna)(UID in HEX)(option 'l' for 224 UID"},
 614   {"read",        CmdLFRead,          0, "['h' or <divisor>] -- Read 125/134 kHz LF ID-only tag (option 'h' for 134, alternatively: f=12MHz/(divisor+1))"},
 615   {"search",      CmdLFfind,          1, "Read and Search for valid known tag (in offline mode it you can load first then search)"},
 616   {"sim",         CmdLFSim,           0, "[GAP] -- Simulate LF tag from buffer with optional GAP (in microseconds)"},
 617   {"simbidir",    CmdLFSimBidir,      0, "Simulate LF tag (with bidirectional data transmission between reader and tag)"},
 618   {"simman",      CmdLFSimManchester, 0, "<Clock> <Bitstream> [GAP] Simulate arbitrary Manchester LF tag"},
 619   {"snoop",       CmdLFSnoop,         0, "['l'|'h'|<divisor>] [trigger threshold]-- Snoop LF (l:125khz, h:134khz)"},
 620   {"ti",          CmdLFTI,            1, "{ TI RFIDs... }"},
 621   {"hitag",       CmdLFHitag,         1, "{ Hitag tags and transponders... }"},
 622   {"vchdemod",    CmdVchDemod,        1, "['clone'] -- Demodulate samples for VeriChip"},
 623   {"t55xx",       CmdLFT55XX,         1, "{ T55xx RFIDs... }"},
 624   {"pcf7931",     CmdLFPCF7931,       1, "{PCF7931 RFIDs...}"},
 625   {NULL, NULL, 0, NULL}
 626 };
 627
 628 int CmdLF(const char *Cmd)
 629 {
 630   CmdsParse(CommandTable, Cmd);
 631   return 0;
 632 }
 633
 634 int CmdHelp(const char *Cmd)
 635 {
 636   CmdsHelp(CommandTable);
 637   return 0;
 638 }