cvs.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   if (rawbit>0){
 175     PrintAndLog("Recovered %d raw bits, expected: %d", rawbit, GraphTraceLen/32);
 176     PrintAndLog("worst metric (0=best..7=worst): %d at pos %d", worst, worstPos);
 177   } else return 0;
 178   // Finding the start of a UID
 179   int uidlen, long_wait;
 180   if (strcmp(Cmd, "224") == 0) {
 181     uidlen = 224;
 182     long_wait = 30;
 183   } else {
 184     uidlen = 64;
 185     long_wait = 29;
 186   }
 187   int start;
 188   int first = 0;
 189   for (start = 0; start <= rawbit - uidlen; start++) {
 190     first = rawbits[start];
 191     for (i = start; i < start + long_wait; i++) {
 192       if (rawbits[i] != first) {
 193         break;
 194       }
 195     }
 196     if (i == (start + long_wait)) {
 197       break;
 198     }
 199   }
 200   if (start == rawbit - uidlen + 1) {
 201     PrintAndLog("nothing to wait for");
 202     return 0;
 203   }
 204
 205   // Inverting signal if needed
 206   if (first == 1) {
 207     for (i = start; i < rawbit; i++) {
 208       rawbits[i] = !rawbits[i];
 209     }
 210   }
 211
 212   // Dumping UID
 213   uint8_t bits[224];
 214   char showbits[225];
 215   showbits[uidlen]='\0';
 216   int bit;
 217   i = start;
 218   int times = 0;
 219   if (uidlen > rawbit) {
 220     PrintAndLog("Warning: not enough raw bits to get a full UID");
 221     for (bit = 0; bit < rawbit; bit++) {
 222       bits[bit] = rawbits[i++];
 223       // As we cannot know the parity, let's use "." and "/"
 224       showbits[bit] = '.' + bits[bit];
 225     }
 226     showbits[bit+1]='\0';
 227     PrintAndLog("Partial UID=%s", showbits);
 228     return 0;
 229   } else {
 230     for (bit = 0; bit < uidlen; bit++) {
 231       bits[bit] = rawbits[i++];
 232       showbits[bit] = '0' + bits[bit];
 233     }
 234     times = 1;
 235   }
 236
 237   //convert UID to HEX
 238   uint32_t uid1, uid2, uid3, uid4, uid5, uid6, uid7;
 239   int idx;
 240   uid1=0;
 241   uid2=0;
 242   if (uidlen==64){
 243     for( idx=0; idx<64; idx++) {
 244         if (showbits[idx] == '0') {
 245         uid1=(uid1<<1)|(uid2>>31);
 246         uid2=(uid2<<1)|0;
 247         } else {
 248         uid1=(uid1<<1)|(uid2>>31);
 249         uid2=(uid2<<1)|1;
 250         }
 251       }
 252     PrintAndLog("UID=%s (%x%08x)", showbits, uid1, uid2);
 253   }
 254   else {
 255     uid3=0;
 256     uid4=0;
 257     uid5=0;
 258     uid6=0;
 259     uid7=0;
 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         if (showbits[idx] == '0') uid7=(uid7<<1)|0;
 268         else uid7=(uid7<<1)|1;
 269       }
 270     PrintAndLog("UID=%s (%x%08x%08x%08x%08x%08x%08x)", showbits, uid1, uid2, uid3, uid4, uid5, uid6, uid7);
 271   }
 272
 273   // Checking UID against next occurrences
 274   for (; i + uidlen <= rawbit;) {
 275     int failed = 0;
 276     for (bit = 0; bit < uidlen; bit++) {
 277       if (bits[bit] != rawbits[i++]) {
 278         failed = 1;
 279         break;
 280       }
 281     }
 282     if (failed == 1) {
 283       break;
 284     }
 285     times += 1;
 286   }
 287   PrintAndLog("Occurrences: %d (expected %d)", times, (rawbit - start) / uidlen);
 288
 289   // Remodulating for tag cloning
 290   GraphTraceLen = 32*uidlen;
 291   i = 0;
 292   int phase = 0;
 293   for (bit = 0; bit < uidlen; bit++) {
 294     if (bits[bit] == 0) {
 295       phase = 0;
 296     } else {
 297       phase = 1;
 298     }
 299     int j;
 300     for (j = 0; j < 32; j++) {
 301       GraphBuffer[i++] = phase;
 302       phase = !phase;
 303     }
 304   }
 305
 306   RepaintGraphWindow();
 307   return 1;
 308 }
 309
 310 int CmdIndalaClone(const char *Cmd)
 311 {
 312   unsigned int uid1, uid2, uid3, uid4, uid5, uid6, uid7;
 313   UsbCommand c;
 314   uid1=0;
 315   uid2=0;
 316   uid3=0;
 317   uid4=0;
 318   uid5=0;
 319   uid6=0;
 320   uid7=0;
 321   int n = 0, i = 0;
 322
 323   if (strchr(Cmd,'l') != 0) {
 324     while (sscanf(&Cmd[i++], "%1x", &n ) == 1) {
 325       uid1 = (uid1 << 4) | (uid2 >> 28);
 326       uid2 = (uid2 << 4) | (uid3 >> 28);
 327       uid3 = (uid3 << 4) | (uid4 >> 28);
 328       uid4 = (uid4 << 4) | (uid5 >> 28);
 329       uid5 = (uid5 << 4) | (uid6 >> 28);
 330       uid6 = (uid6 << 4) | (uid7 >> 28);
 331         uid7 = (uid7 << 4) | (n & 0xf);
 332     }
 333     PrintAndLog("Cloning 224bit tag with UID %x%08x%08x%08x%08x%08x%08x", uid1, uid2, uid3, uid4, uid5, uid6, uid7);
 334     c.cmd = CMD_INDALA_CLONE_TAG_L;
 335     c.d.asDwords[0] = uid1;
 336     c.d.asDwords[1] = uid2;
 337     c.d.asDwords[2] = uid3;
 338     c.d.asDwords[3] = uid4;
 339     c.d.asDwords[4] = uid5;
 340     c.d.asDwords[5] = uid6;
 341     c.d.asDwords[6] = uid7;
 342   }
 343   else
 344   {
 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   // 'h' means higher-low-frequency, 134 kHz
 363   if(*Cmd == 'h') {
 364     c.arg[0] = 1;
 365   } else if (*Cmd == '\0') {
 366     c.arg[0] = 0;
 367   } else if (sscanf(Cmd, "%"lli, &c.arg[0]) != 1) {
 368     PrintAndLog("use 'read' or 'read h', or 'read <divisor>'");
 369     return 0;
 370   }
 371   SendCommand(&c);
 372   WaitForResponse(CMD_ACK,NULL);
 373   return 0;
 374 }
 375
 376 static void ChkBitstream(const char *str)
 377 {
 378   int i;
 379
 380   /* convert to bitstream if necessary */
 381   for (i = 0; i < (int)(GraphTraceLen / 2); i++)
 382   {
 383     if (GraphBuffer[i] > 1 || GraphBuffer[i] < 0)
 384     {
 385       CmdBitstream(str);
 386       break;
 387     }
 388   }
 389 }
 390
 391 int CmdLFSim(const char *Cmd)
 392 {
 393   int i;
 394   static int gap;
 395
 396   sscanf(Cmd, "%i", &gap);
 397
 398   /* convert to bitstream if necessary */
 399   ChkBitstream(Cmd);
 400
 401   PrintAndLog("Sending data, please wait...");
 402   for (i = 0; i < GraphTraceLen; i += 48) {
 403     UsbCommand c={CMD_DOWNLOADED_SIM_SAMPLES_125K, {i, 0, 0}};
 404     int j;
 405     for (j = 0; j < 48; j++) {
 406       c.d.asBytes[j] = GraphBuffer[i+j];
 407     }
 408     SendCommand(&c);
 409     WaitForResponse(CMD_ACK,NULL);
 410   }
 411
 412   PrintAndLog("Starting simulator...");
 413   UsbCommand c = {CMD_SIMULATE_TAG_125K, {GraphTraceLen, gap, 0}};
 414   SendCommand(&c);
 415   return 0;
 416 }
 417
 418 int CmdLFSimBidir(const char *Cmd)
 419 {
 420   /* Set ADC to twice the carrier for a slight supersampling */
 421   UsbCommand c = {CMD_LF_SIMULATE_BIDIR, {47, 384, 0}};
 422   SendCommand(&c);
 423   return 0;
 424 }
 425
 426 /* simulate an LF Manchester encoded tag with specified bitstream, clock rate and inter-id gap */
 427 int CmdLFSimManchester(const char *Cmd)
 428 {
 429   static int clock, gap;
 430   static char data[1024], gapstring[8];
 431
 432   /* get settings/bits */
 433   sscanf(Cmd, "%i %s %i", &clock, &data[0], &gap);
 434
 435   /* clear our graph */
 436   ClearGraph(0);
 437
 438   /* fill it with our bitstream */
 439   for (int i = 0; i < strlen(data) ; ++i)
 440     AppendGraph(0, clock, data[i]- '0');
 441
 442   /* modulate */
 443   CmdManchesterMod("");
 444
 445   /* show what we've done */
 446   RepaintGraphWindow();
 447
 448   /* simulate */
 449   sprintf(&gapstring[0], "%i", gap);
 450   CmdLFSim(gapstring);
 451   return 0;
 452 }
 453
 454 int CmdLFSnoop(const char *Cmd)
 455 {
 456   UsbCommand c = {CMD_LF_SNOOP_RAW_ADC_SAMPLES};
 457   // 'h' means higher-low-frequency, 134 kHz
 458   c.arg[0] = 0;
 459   c.arg[1] = -1;
 460   if (*Cmd == 0) {
 461     // empty
 462   } else if (*Cmd == 'l') {
 463     sscanf(Cmd, "l %"lli, &c.arg[1]);
 464   } else if(*Cmd == 'h') {
 465     c.arg[0] = 1;
 466     sscanf(Cmd, "h %"lli, &c.arg[1]);
 467   } else if (sscanf(Cmd, "%"lli" %"lli, &c.arg[0], &c.arg[1]) < 1) {
 468     PrintAndLog("use 'snoop' or 'snoop {l,h} [trigger threshold]', or 'snoop <divisor> [trigger threshold]'");
 469     return 0;
 470   }
 471   SendCommand(&c);
 472   WaitForResponse(CMD_ACK,NULL);
 473   return 0;
 474 }
 475
 476 int CmdVchDemod(const char *Cmd)
 477 {
 478   // Is this the entire sync pattern, or does this also include some
 479   // data bits that happen to be the same everywhere? That would be
 480   // lovely to know.
 481   static const int SyncPattern[] = {
 482     1,  1,  1,  1,  1,  1,  1,  1,  1,  1,  1,  1,  1,  1,  1,  1,
 483     1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
 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   };
 493
 494   // So first, we correlate for the sync pattern, and mark that.
 495   int bestCorrel = 0, bestPos = 0;
 496   int i;
 497   // It does us no good to find the sync pattern, with fewer than
 498   // 2048 samples after it...
 499   for (i = 0; i < (GraphTraceLen-2048); i++) {
 500     int sum = 0;
 501     int j;
 502     for (j = 0; j < arraylen(SyncPattern); j++) {
 503       sum += GraphBuffer[i+j]*SyncPattern[j];
 504     }
 505     if (sum > bestCorrel) {
 506       bestCorrel = sum;
 507       bestPos = i;
 508     }
 509   }
 510   PrintAndLog("best sync at %d [metric %d]", bestPos, bestCorrel);
 511
 512   char bits[257];
 513   bits[256] = '\0';
 514
 515   int worst = INT_MAX;
 516   int worstPos = 0;
 517
 518   for (i = 0; i < 2048; i += 8) {
 519     int sum = 0;
 520     int j;
 521     for (j = 0; j < 8; j++) {
 522       sum += GraphBuffer[bestPos+i+j];
 523     }
 524     if (sum < 0) {
 525       bits[i/8] = '.';
 526     } else {
 527       bits[i/8] = '1';
 528     }
 529     if(abs(sum) < worst) {
 530       worst = abs(sum);
 531       worstPos = i;
 532     }
 533   }
 534   PrintAndLog("bits:");
 535   PrintAndLog("%s", bits);
 536   PrintAndLog("worst metric: %d at pos %d", worst, worstPos);
 537
 538   if (strcmp(Cmd, "clone")==0) {
 539     GraphTraceLen = 0;
 540     char *s;
 541     for(s = bits; *s; s++) {
 542       int j;
 543       for(j = 0; j < 16; j++) {
 544         GraphBuffer[GraphTraceLen++] = (*s == '1') ? 1 : 0;
 545       }
 546     }
 547     RepaintGraphWindow();
 548   }
 549   return 0;
 550 }
 551
 552 //by marshmellow
 553 int CmdLFfind(const char *Cmd)
 554 {
 555   int ans=0;
 556   if (!offline){
 557     ans=CmdLFRead("");
 558     ans=CmdSamples("20000");
 559   }
 560   if (GraphTraceLen<1000) return 0;
 561   PrintAndLog("NOTE: some demods output possible binary\n  if it finds something that looks like a tag");
 562   PrintAndLog("Checking for known tags:");
 563
 564   ans=Cmdaskmandemod("");
 565   if (ans>0) {
 566     PrintAndLog("Valid EM410x ID Found!");
 567     return 1;
 568   }
 569   ans=CmdFSKdemodHID("");
 570   if (ans>0) {
 571     PrintAndLog("Valid HID Prox ID Found!");
 572     return 1;
 573   }
 574   ans=CmdFSKdemodIO("");
 575   if (ans>0) {
 576     PrintAndLog("Valid IO Prox ID Found!");
 577     return 1;
 578   }
 579   //add psk and indala
 580   ans=CmdIndalaDecode("");
 581   if (ans>0) {
 582     PrintAndLog("Valid Indala ID Found!");
 583     return 1;
 584   }
 585  // ans=CmdIndalaDemod("224");
 586  // if (ans>0) return 1;
 587   PrintAndLog("No Known Tags Found!\n");
 588   return 0;
 589 }
 590
 591 static command_t CommandTable[] =
 592 {
 593   {"help",        CmdHelp,            1, "This help"},
 594   {"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)"},
 595   {"em4x",        CmdLFEM4X,          1, "{ EM4X RFIDs... }"},
 596   {"flexdemod",   CmdFlexdemod,       1, "Demodulate samples for FlexPass"},
 597   {"hid",         CmdLFHID,           1, "{ HID RFIDs... }"},
 598   {"io",          CmdLFIO,                1, "{ ioProx tags... }"},
 599   {"indalademod", CmdIndalaDemod,     1, "['224'] -- Demodulate samples for Indala 64 bit UID (option '224' for 224 bit)"},
 600   {"indalaclone", CmdIndalaClone,     0, "<UID> ['l']-- Clone Indala to T55x7 (tag must be in antenna)(UID in HEX)(option 'l' for 224 UID"},
 601   {"read",        CmdLFRead,          0, "['h' or <divisor>] -- Read 125/134 kHz LF ID-only tag (option 'h' for 134, alternatively: f=12MHz/(divisor+1))"},
 602   {"search",      CmdLFfind,          1, "Read and Search for valid known tag (in offline mode it you can load first then search)"},
 603   {"sim",         CmdLFSim,           0, "[GAP] -- Simulate LF tag from buffer with optional GAP (in microseconds)"},
 604   {"simbidir",    CmdLFSimBidir,      0, "Simulate LF tag (with bidirectional data transmission between reader and tag)"},
 605   {"simman",      CmdLFSimManchester, 0, "<Clock> <Bitstream> [GAP] Simulate arbitrary Manchester LF tag"},
 606   {"snoop",       CmdLFSnoop,         0, "['l'|'h'|<divisor>] [trigger threshold]-- Snoop LF (l:125khz, h:134khz)"},
 607   {"ti",          CmdLFTI,            1, "{ TI RFIDs... }"},
 608   {"hitag",       CmdLFHitag,         1, "{ Hitag tags and transponders... }"},
 609   {"vchdemod",    CmdVchDemod,        1, "['clone'] -- Demodulate samples for VeriChip"},
 610   {"t55xx",       CmdLFT55XX,         1, "{ T55xx RFIDs... }"},
 611   {"pcf7931",     CmdLFPCF7931,       1, "{PCF7931 RFIDs...}"},
 612   {NULL, NULL, 0, NULL}
 613 };
 614
 615 int CmdLF(const char *Cmd)
 616 {
 617   CmdsParse(CommandTable, Cmd);
 618   return 0;
 619 }
 620
 621 int CmdHelp(const char *Cmd)
 622 {
 623   CmdsHelp(CommandTable);
 624   return 0;
 625 }