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

   1 //-----------------------------------------------------------------------------
   2 // Copyright (C) 2015 Piwi
   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 // High frequency Topaz (NFC Type 1) commands
   9 //-----------------------------------------------------------------------------
  10
  11 #include "cmdhftopaz.h"
  12
  13 #include <stdio.h>
  14 #include <stdlib.h>
  15 #include <string.h>
  16 #include <unistd.h>
  17 #include "cmdmain.h"
  18 #include "cmdparser.h"
  19 #include "cmdhf14a.h"
  20 #include "ui.h"
  21 #include "mifare.h"
  22 #include "comms.h"
  23 #include "iso14443crc.h"
  24 #include "protocols.h"
  25 #include "taginfo.h"
  26
  27 #define TOPAZ_STATIC_MEMORY     (0x0f * 8)              // 15 blocks with 8 Bytes each
  28
  29 // a struct to describe a memory area which contains lock bits and the corresponding lockable memory area
  30 typedef struct dynamic_lock_area {
  31         struct dynamic_lock_area *next;
  32         uint16_t        byte_offset;                    // the address of the lock bits
  33         uint16_t        size_in_bits;
  34         uint16_t        first_locked_byte;              // the address of the lockable area
  35         uint16_t        bytes_locked_per_bit;
  36 } dynamic_lock_area_t;
  37
  38
  39 static struct {
  40         uint8_t HR01[2];
  41         uint8_t uid[7];
  42         uint16_t size;
  43         uint8_t data_blocks[TOPAZ_STATIC_MEMORY/8][8];  // this memory is always there
  44         uint8_t *dynamic_memory;                                                // this memory can be there
  45         dynamic_lock_area_t *dynamic_lock_areas;                // lock area descriptors
  46 } topaz_tag;
  47
  48
  49 static void topaz_switch_on_field(void)
  50 {
  51         UsbCommand c = {CMD_READER_ISO_14443a, {ISO14A_CONNECT | ISO14A_NO_SELECT | ISO14A_NO_DISCONNECT | ISO14A_TOPAZMODE, 0, 0}};
  52         SendCommand(&c);
  53 }
  54
  55
  56 static void topaz_switch_off_field(void)
  57 {
  58         UsbCommand c = {CMD_READER_ISO_14443a, {0, 0, 0}};
  59         SendCommand(&c);
  60 }
  61
  62
  63 // send a raw topaz command, returns the length of the response (0 in case of error)
  64 static int topaz_send_cmd_raw(uint8_t *cmd, uint8_t len, uint8_t *response)
  65 {
  66         UsbCommand c = {CMD_READER_ISO_14443a, {ISO14A_RAW | ISO14A_NO_DISCONNECT | ISO14A_TOPAZMODE, len, 0}};
  67         memcpy(c.d.asBytes, cmd, len);
  68         SendCommand(&c);
  69
  70         UsbCommand resp;
  71         WaitForResponse(CMD_ACK, &resp);
  72
  73         if (resp.arg[0] > 0) {
  74                 memcpy(response, resp.d.asBytes, resp.arg[0]);
  75         }
  76
  77         return resp.arg[0];
  78 }
  79
  80
  81 // calculate CRC bytes and send topaz command, returns the length of the response (0 in case of error)
  82 static int topaz_send_cmd(uint8_t *cmd, uint8_t len, uint8_t *response)
  83 {
  84         if (len > 1) {
  85         uint8_t first, second;
  86                 ComputeCrc14443(CRC_14443_B, cmd, len-2, &first, &second);
  87         cmd[len-2] = first;
  88         cmd[len-1] = second;
  89         }
  90
  91         return topaz_send_cmd_raw(cmd, len, response);
  92 }
  93
  94
  95 // select a topaz tag. Send WUPA and RID.
  96 static int topaz_select(uint8_t *atqa, uint8_t *rid_response)
  97 {
  98         // ToDo: implement anticollision
  99
 100         uint8_t wupa_cmd[] = {TOPAZ_WUPA};
 101         uint8_t rid_cmd[] = {TOPAZ_RID, 0, 0, 0, 0, 0, 0, 0, 0};
 102
 103         topaz_switch_on_field();
 104
 105         if (!topaz_send_cmd(wupa_cmd, sizeof(wupa_cmd), atqa)) {
 106                 topaz_switch_off_field();
 107                 return -1;              // WUPA failed
 108         }
 109
 110         if (!topaz_send_cmd(rid_cmd, sizeof(rid_cmd), rid_response)) {
 111                 topaz_switch_off_field();
 112                 return -2;              // RID failed
 113         }
 114
 115         return 0;               // OK
 116 }
 117
 118
 119 // read all of the static memory of a selected Topaz tag.
 120 static int topaz_rall(uint8_t *uid, uint8_t *response)
 121 {
 122         uint8_t rall_cmd[] = {TOPAZ_RALL, 0, 0, 0, 0, 0, 0, 0, 0};
 123
 124         memcpy(&rall_cmd[3], uid, 4);
 125         if (!topaz_send_cmd(rall_cmd, sizeof(rall_cmd), response)) {
 126                 topaz_switch_off_field();
 127                 return -1;              // RALL failed
 128         }
 129
 130         return 0;
 131 }
 132
 133
 134 // read a block (8 Bytes) of a selected Topaz tag.
 135 static int topaz_read_block(uint8_t *uid, uint8_t blockno, uint8_t *block_data)
 136 {
 137         uint8_t read8_cmd[] = {TOPAZ_READ8, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0};
 138         uint8_t read8_response[11];
 139
 140         read8_cmd[1] = blockno;
 141         memcpy(&read8_cmd[10], uid, 4);
 142         if (!topaz_send_cmd(read8_cmd, sizeof(read8_cmd), read8_response)) {
 143                 topaz_switch_off_field();
 144                 return -1;              // READ8 failed
 145         }
 146
 147         memcpy(block_data, &read8_response[1], 8);
 148
 149         return 0;
 150 }
 151
 152
 153 // read a segment (16 blocks = 128 Bytes) of a selected Topaz tag. Works only for tags with dynamic memory.
 154 static int topaz_read_segment(uint8_t *uid, uint8_t segno, uint8_t *segment_data)
 155 {
 156         uint8_t rseg_cmd[] = {TOPAZ_RSEG, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0};
 157         uint8_t rseg_response[131];
 158
 159         rseg_cmd[1] = segno << 4;
 160         memcpy(&rseg_cmd[10], uid, 4);
 161         if (!topaz_send_cmd(rseg_cmd, sizeof(rseg_cmd), rseg_response)) {
 162                 topaz_switch_off_field();
 163                 return -1;              // RSEG failed
 164         }
 165
 166         memcpy(segment_data, &rseg_response[1], 128);
 167
 168         return 0;
 169 }
 170
 171
 172 // search for the lock area descriptor for the lockable area including byteno
 173 static dynamic_lock_area_t *get_dynamic_lock_area(uint16_t byteno)
 174 {
 175         dynamic_lock_area_t *lock_area;
 176
 177         lock_area = topaz_tag.dynamic_lock_areas;
 178
 179         while (lock_area != NULL) {
 180                 if (byteno < lock_area->first_locked_byte) {
 181                         lock_area = lock_area->next;
 182                 } else {
 183                         return lock_area;
 184                 }
 185         }
 186
 187         return NULL;
 188 }
 189
 190
 191 // check if a memory byte is locked.
 192 static bool topaz_byte_is_locked(uint16_t byteno)
 193 {
 194         uint8_t *lockbits;
 195         uint16_t locked_bytes_per_bit;
 196         dynamic_lock_area_t *lock_area;
 197
 198         if (byteno < TOPAZ_STATIC_MEMORY) {
 199                 lockbits = &topaz_tag.data_blocks[0x0e][0];
 200                 locked_bytes_per_bit = 8;
 201         } else {
 202                 lock_area = get_dynamic_lock_area(byteno);
 203                 if (lock_area == NULL) {
 204                         return false;
 205                 } else {
 206                         lockbits = &topaz_tag.dynamic_memory[lock_area->byte_offset - TOPAZ_STATIC_MEMORY];
 207                         locked_bytes_per_bit = lock_area->bytes_locked_per_bit;
 208                         byteno = byteno - lock_area->first_locked_byte;
 209                 }
 210         }
 211
 212         uint16_t blockno = byteno / locked_bytes_per_bit;
 213         if(lockbits[blockno/8] & (0x01 << (blockno % 8))) {
 214                 return true;
 215         } else {
 216                 return false;
 217         }
 218 }
 219
 220
 221 // read and print the Capability Container
 222 static int topaz_print_CC(uint8_t *data)
 223 {
 224         if(data[0] != 0xe1) {
 225                 topaz_tag.size = TOPAZ_STATIC_MEMORY;
 226                 return -1;              // no NDEF message
 227         }
 228
 229         PrintAndLog("Capability Container: %02x %02x %02x %02x", data[0], data[1], data[2], data[3]);
 230         PrintAndLog("  %02x: NDEF Magic Number", data[0]);
 231         PrintAndLog("  %02x: version %d.%d supported by tag", data[1], (data[1] & 0xF0) >> 4, data[1] & 0x0f);
 232         uint16_t memsize = (data[2] + 1) * 8;
 233         topaz_tag.size = memsize;
 234         topaz_tag.dynamic_memory = malloc(memsize - TOPAZ_STATIC_MEMORY);
 235         PrintAndLog("  %02x: Physical Memory Size of this tag: %d bytes", data[2], memsize);
 236         PrintAndLog("  %02x: %s / %s", data[3],
 237                                 (data[3] & 0xF0) ? "(RFU)" : "Read access granted without any security",
 238                                 (data[3] & 0x0F)==0 ? "Write access granted without any security" : (data[3] & 0x0F)==0x0F ? "No write access granted at all" : "(RFU)");
 239         return 0;
 240 }
 241
 242
 243 // return type, length and value of a TLV, starting at memory position *TLV_ptr
 244 static void get_TLV(uint8_t **TLV_ptr, uint8_t *TLV_type, uint16_t *TLV_length, uint8_t **TLV_value)
 245 {
 246         *TLV_length = 0;
 247         *TLV_value = NULL;
 248
 249         *TLV_type = **TLV_ptr;
 250         *TLV_ptr += 1;
 251         switch (*TLV_type) {
 252                 case 0x00:                      // NULL TLV.
 253                 case 0xFE:                      // Terminator TLV.
 254                         break;
 255                 case 0x01:                      // Lock Control TLV
 256                 case 0x02:                      // Reserved Memory TLV
 257                 case 0x03:                      // NDEF message TLV
 258                 case 0xFD:                      // proprietary TLV
 259                         *TLV_length = **TLV_ptr;
 260                         *TLV_ptr += 1;
 261                         if (*TLV_length == 0xff) {
 262                                 *TLV_length = **TLV_ptr << 8;
 263                                 *TLV_ptr += 1;
 264                                 *TLV_length |= **TLV_ptr;
 265                                 *TLV_ptr += 1;
 266                         }
 267                         *TLV_value = *TLV_ptr;
 268                         *TLV_ptr += *TLV_length;
 269                         break;
 270                 default:                        // RFU
 271                         break;
 272         }
 273 }
 274
 275
 276 // lock area TLVs contain no information on the start of the respective lockable area. Lockable areas
 277 // do not include the lock bits and reserved memory. We therefore need to adjust the start of the
 278 // respective lockable areas accordingly
 279 static void adjust_lock_areas(uint16_t block_start, uint16_t block_size)
 280 {
 281         dynamic_lock_area_t *lock_area = topaz_tag.dynamic_lock_areas;
 282         while (lock_area != NULL) {
 283                 if (lock_area->first_locked_byte <= block_start) {
 284                         lock_area->first_locked_byte += block_size;
 285                 }
 286                 lock_area = lock_area->next;
 287         }
 288 }
 289
 290
 291 // read and print the lock area and reserved memory TLVs
 292 static void topaz_print_control_TLVs(uint8_t *memory)
 293 {
 294         uint8_t *TLV_ptr = memory;
 295         uint8_t TLV_type = 0;
 296         uint16_t TLV_length;
 297         uint8_t *TLV_value;
 298         bool lock_TLV_present = false;
 299         bool reserved_memory_control_TLV_present = false;
 300         uint16_t next_lockable_byte = 0x0f * 8;                         // first byte after static memory area
 301
 302         while(*TLV_ptr != 0x03 && *TLV_ptr != 0xFD && *TLV_ptr != 0xFE) {
 303                 // all Lock Control TLVs shall be present before the NDEF message TLV, the proprietary TLV (and the Terminator TLV)
 304                 get_TLV(&TLV_ptr, &TLV_type, &TLV_length, &TLV_value);
 305                 if (TLV_type == 0x01) {                 // a Lock Control TLV
 306                         uint8_t pages_addr = TLV_value[0] >> 4;
 307                         uint8_t byte_offset = TLV_value[0] & 0x0f;
 308                         uint16_t size_in_bits = TLV_value[1] ? TLV_value[1] : 256;
 309                         uint16_t size_in_bytes = (size_in_bits + 7)/8;
 310                         uint16_t bytes_per_page = 1 << (TLV_value[2] & 0x0f);
 311                         uint16_t bytes_locked_per_bit = 1 << (TLV_value[2] >> 4);
 312                         uint16_t area_start = pages_addr * bytes_per_page + byte_offset;
 313                         PrintAndLog("Lock Area of %d bits at byte offset 0x%04x. Each Lock Bit locks %d bytes.",
 314                                                 size_in_bits,
 315                                                 area_start,
 316                                                 bytes_locked_per_bit);
 317                         lock_TLV_present = true;
 318                         dynamic_lock_area_t *old = topaz_tag.dynamic_lock_areas;
 319                         dynamic_lock_area_t *new = topaz_tag.dynamic_lock_areas;
 320                         if (old == NULL) {
 321                                 new = topaz_tag.dynamic_lock_areas = (dynamic_lock_area_t *)malloc(sizeof(dynamic_lock_area_t));
 322                         } else {
 323                                 while(old->next != NULL) {
 324                                         old = old->next;
 325                                 }
 326                                 new = old->next = (dynamic_lock_area_t *)malloc(sizeof(dynamic_lock_area_t));
 327                         }
 328                         new->next = NULL;
 329                         if (area_start <= next_lockable_byte) {
 330                                 // lock areas are not lockable
 331                                 next_lockable_byte += size_in_bytes;
 332                         }
 333                         new->first_locked_byte = next_lockable_byte;
 334                         new->byte_offset = area_start;
 335                         new->size_in_bits = size_in_bits;
 336                         new->bytes_locked_per_bit = bytes_locked_per_bit;
 337                         next_lockable_byte += size_in_bits * bytes_locked_per_bit;
 338                 }
 339                 if (TLV_type == 0x02) {                 // a Reserved Memory Control TLV
 340                         uint8_t pages_addr = TLV_value[0] >> 4;
 341                         uint8_t byte_offset = TLV_value[0] & 0x0f;
 342                         uint16_t size_in_bytes = TLV_value[1] ? TLV_value[1] : 256;
 343                         uint8_t bytes_per_page = 1 << (TLV_value[2] & 0x0f);
 344                         uint16_t area_start = pages_addr * bytes_per_page + byte_offset;
 345                         PrintAndLog("Reserved Memory of %d bytes at byte offset 0x%02x.",
 346                                                 size_in_bytes,
 347                                                 area_start);
 348                         reserved_memory_control_TLV_present = true;
 349                         adjust_lock_areas(area_start, size_in_bytes);  // reserved memory areas are not lockable
 350                         if (area_start <= next_lockable_byte) {
 351                                 next_lockable_byte += size_in_bytes;
 352                         }
 353                 }
 354         }
 355
 356         if (!lock_TLV_present) {
 357                 PrintAndLog("(No Lock Control TLV present)");
 358         }
 359
 360         if (!reserved_memory_control_TLV_present) {
 361                 PrintAndLog("(No Reserved Memory Control TLV present)");
 362         }
 363 }
 364
 365
 366 // read all of the dynamic memory
 367 static int topaz_read_dynamic_data(void)
 368 {
 369         // first read the remaining block of segment 0
 370         if(topaz_read_block(topaz_tag.uid, 0x0f, &topaz_tag.dynamic_memory[0]) == -1) {
 371                 PrintAndLog("Error while reading dynamic memory block %02x. Aborting...", 0x0f);
 372                 return -1;
 373         }
 374
 375         // read the remaining segments
 376         uint8_t max_segment = topaz_tag.size / 128 - 1;
 377         for(uint8_t segment = 1; segment <= max_segment; segment++) {
 378                 if(topaz_read_segment(topaz_tag.uid, segment, &topaz_tag.dynamic_memory[(segment-1)*128+8]) == -1) {
 379                         PrintAndLog("Error while reading dynamic memory block %02x. Aborting...", 0x0f);
 380                         return -1;
 381                 }
 382         }
 383
 384         return 0;
 385 }
 386
 387
 388 // read and print the dynamic memory
 389 static void topaz_print_dynamic_data(void)
 390 {
 391         if (topaz_tag.size > TOPAZ_STATIC_MEMORY) {
 392                 PrintAndLog("Dynamic Data blocks:");
 393                 if (topaz_read_dynamic_data() == 0) {
 394                         PrintAndLog("block# | offset | Data                    | Locked(y/n)");
 395                         char line[80];
 396                         for (uint16_t blockno = 0x0f; blockno < topaz_tag.size/8; blockno++) {
 397                                 uint8_t *block_data = &topaz_tag.dynamic_memory[(blockno-0x0f)*8];
 398                                 char lockbits[9];
 399                                 for (uint16_t j = 0; j < 8; j++) {
 400                                         sprintf(&line[3*j], "%02x ", block_data[j]);
 401                                         lockbits[j] = topaz_byte_is_locked(blockno*8+j) ? 'y' : 'n';
 402                                 }
 403                                 lockbits[8] = '\0';
 404                                 PrintAndLog("  0x%02x | 0x%04x | %s|   %-3s", blockno, blockno*8, line, lockbits);
 405                         }
 406                 }
 407         }
 408 }
 409
 410
 411 static void topaz_print_lifecycle_state(uint8_t *data)
 412 {
 413         // to be done
 414 }
 415
 416
 417 static void topaz_print_NDEF(uint8_t *data)
 418 {
 419         // to be done.
 420 }
 421
 422
 423 // read a Topaz tag and print some usefull information
 424 int CmdHFTopazReader(const char *Cmd)
 425 {
 426         int status;
 427         uint8_t atqa[2];
 428         uint8_t rid_response[8];
 429         uint8_t *uid_echo = &rid_response[2];
 430         uint8_t rall_response[124];
 431
 432         status = topaz_select(atqa, rid_response);
 433
 434         if (status == -1) {
 435                 PrintAndLog("Error: couldn't receive ATQA");
 436                 return -1;
 437         }
 438
 439         PrintAndLog("ATQA : %02x %02x", atqa[1], atqa[0]);
 440         if (atqa[1] != 0x0c && atqa[0] != 0x00) {
 441                 PrintAndLog("Tag doesn't support the Topaz protocol.");
 442                 topaz_switch_off_field();
 443                 return -1;
 444         }
 445
 446         if (status == -2) {
 447                 PrintAndLog("Error: tag didn't answer to RID");
 448                 topaz_switch_off_field();
 449                 return -1;
 450         }
 451
 452         topaz_tag.HR01[0] = rid_response[0];
 453         topaz_tag.HR01[1] = rid_response[1];
 454
 455         // ToDo: CRC check
 456         PrintAndLog("HR0  : %02x (%sa Topaz tag (%scapable of carrying a NDEF message), %s memory map)", rid_response[0],
 457                                                 (rid_response[0] & 0xF0) == 0x10 ? "" : "not ",
 458                                                 (rid_response[0] & 0xF0) == 0x10 ? "" : "not ",
 459                                                 (rid_response[0] & 0x0F) == 0x01 ? "static" : "dynamic");
 460         PrintAndLog("HR1  : %02x", rid_response[1]);
 461
 462         status = topaz_rall(uid_echo, rall_response);
 463
 464         if(status == -1) {
 465                 PrintAndLog("Error: tag didn't answer to RALL");
 466                 topaz_switch_off_field();
 467                 return -1;
 468         }
 469
 470         memcpy(topaz_tag.uid, rall_response+2, 7);
 471         PrintAndLog("UID  : %02x %02x %02x %02x %02x %02x %02x",
 472                         topaz_tag.uid[6],
 473                         topaz_tag.uid[5],
 474                         topaz_tag.uid[4],
 475                         topaz_tag.uid[3],
 476                         topaz_tag.uid[2],
 477                         topaz_tag.uid[1],
 478                         topaz_tag.uid[0]);
 479         PrintAndLog("       UID[6] (Manufacturer Byte) = %02x, Manufacturer: %s",
 480                         topaz_tag.uid[6],
 481                         getManufacturerName(topaz_tag.uid[6]));
 482
 483         memcpy(topaz_tag.data_blocks, rall_response+2, 0x0f*8);
 484         PrintAndLog("");
 485         PrintAndLog("Static Data blocks 00 to 0c:");
 486         PrintAndLog("block# | offset | Data                    | Locked(y/n)");
 487         char line[80];
 488         for (uint16_t i = 0; i <= 0x0c; i++) {
 489                 char lockbits[9];
 490                 for (uint16_t j = 0; j < 8; j++) {
 491                         sprintf(&line[3*j], "%02x ", topaz_tag.data_blocks[i][j] /*rall_response[2 + 8*i + j]*/);
 492                         lockbits[j] = topaz_byte_is_locked(i*8+j) ? 'y' : 'n';
 493                 }
 494                 lockbits[8] = '\0';
 495                 PrintAndLog("  0x%02x | 0x%04x | %s|   %-3s", i, i*8, line, lockbits);
 496         }
 497
 498         PrintAndLog("");
 499         PrintAndLog("Static Reserved block 0d:");
 500         for (uint16_t j = 0; j < 8; j++) {
 501                 sprintf(&line[3*j], "%02x ", topaz_tag.data_blocks[0x0d][j]);
 502         }
 503         PrintAndLog("  0x%02x | 0x%04x | %s|   %-3s", 0x0d, 0x0d*8, line, "n/a");
 504
 505         PrintAndLog("");
 506         PrintAndLog("Static Lockbits and OTP Bytes:");
 507         for (uint16_t j = 0; j < 8; j++) {
 508                 sprintf(&line[3*j], "%02x ", topaz_tag.data_blocks[0x0e][j]);
 509         }
 510         PrintAndLog("  0x%02x | 0x%04x | %s|   %-3s", 0x0e, 0x0e*8, line, "n/a");
 511
 512         PrintAndLog("");
 513
 514         status = topaz_print_CC(&topaz_tag.data_blocks[1][0]);
 515
 516         if (status == -1) {
 517                 PrintAndLog("No NDEF message data present");
 518                 topaz_switch_off_field();
 519                 return 0;
 520         }
 521
 522         PrintAndLog("");
 523         topaz_print_control_TLVs(&topaz_tag.data_blocks[1][4]);
 524
 525         PrintAndLog("");
 526         topaz_print_dynamic_data();
 527
 528         topaz_print_lifecycle_state(&topaz_tag.data_blocks[1][0]);
 529
 530         topaz_print_NDEF(&topaz_tag.data_blocks[1][0]);
 531
 532         topaz_switch_off_field();
 533         return 0;
 534 }
 535
 536
 537 int CmdHFTopazCmdRaw(const char *Cmd)
 538 {
 539         PrintAndLog("not yet implemented. Use hf 14 raw with option -T.");
 540         return 0;
 541 }
 542
 543
 544 static int CmdHelp(const char *Cmd);
 545
 546
 547 static command_t CommandTable[] =
 548 {
 549         {"help",        CmdHelp,                        1, "This help"},
 550         {"reader",      CmdHFTopazReader,       0, "Act like a Topaz reader"},
 551         {"snoop",       CmdHF14ASnoop,          0, "Eavesdrop a Topaz reader-tag communication"},
 552         {"raw",         CmdHFTopazCmdRaw,       0, "Send raw hex data to tag"},
 553         {NULL,          NULL,                           0, NULL}
 554 };
 555
 556
 557 int CmdHFTopaz(const char *Cmd) {
 558         (void)WaitForResponseTimeout(CMD_ACK,NULL,100);
 559         CmdsParse(CommandTable, Cmd);
 560         return 0;
 561 }
 562
 563
 564 static int CmdHelp(const char *Cmd)
 565 {
 566         CmdsHelp(CommandTable);
 567         return 0;
 568 }
 569
 570