git.sur5r.net Git - openocd/blob - src/server/telnet_server.c

   1 /***************************************************************************
   2  *   Copyright (C) 2005 by Dominic Rath                                    *
   3  *   Dominic.Rath@gmx.de                                                   *
   4  *                                                                         *
   5  *   Copyright (C) 2007,2008 Øyvind Harboe                                      *
   6  *   oyvind.harboe@zylin.com                                               *
   7  *                                                                         *
   8  *   This program is free software; you can redistribute it and/or modify  *
   9  *   it under the terms of the GNU General Public License as published by  *
  10  *   the Free Software Foundation; either version 2 of the License, or     *
  11  *   (at your option) any later version.                                   *
  12  *                                                                         *
  13  *   This program is distributed in the hope that it will be useful,       *
  14  *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
  15  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
  16  *   GNU General Public License for more details.                          *
  17  *                                                                         *
  18  *   You should have received a copy of the GNU General Public License     *
  19  *   along with this program; if not, write to the                         *
  20  *   Free Software Foundation, Inc.,                                       *
  21  *   59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.             *
  22  ***************************************************************************/
  23 #ifdef HAVE_CONFIG_H
  24 #include "config.h"
  25 #endif
  26
  27 #include "replacements.h"
  28
  29 #include "telnet_server.h"
  30
  31 #include "server.h"
  32 #include "log.h"
  33 #include "command.h"
  34 #include "target.h"
  35 #include "target_request.h"
  36
  37 #include <stdlib.h>
  38 #include <unistd.h>
  39 #include <errno.h>
  40 #include <string.h>
  41 #include <ctype.h>
  42
  43 static unsigned short telnet_port = 0;
  44
  45 int handle_exit_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc);
  46 int handle_telnet_port_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc);
  47
  48 static char *negotiate =
  49                 "\xFF\xFB\x03"          /* IAC WILL Suppress Go Ahead */
  50                 "\xFF\xFB\x01"          /* IAC WILL Echo */
  51                 "\xFF\xFD\x03"          /* IAC DO Suppress Go Ahead */
  52                 "\xFF\xFE\x01";         /* IAC DON'T Echo */
  53
  54 #define CTRL(c) (c - '@')
  55
  56 /* The only way we can detect that the socket is closed is the first time
  57  * we write to it, we will fail. Subsequent write operations will
  58  * succeed. Shudder!
  59  */
  60 int telnet_write(connection_t *connection, const void *data, int len)
  61 {
  62         telnet_connection_t *t_con = connection->priv;
  63         if (t_con->closed)
  64                 return ERROR_SERVER_REMOTE_CLOSED;
  65
  66         if (write_socket(connection->fd, data, len) == len)
  67         {
  68                 return ERROR_OK;
  69         }
  70         t_con->closed = 1;
  71         return ERROR_SERVER_REMOTE_CLOSED;
  72 }
  73
  74 int telnet_prompt(connection_t *connection)
  75 {
  76         telnet_connection_t *t_con = connection->priv;
  77
  78         telnet_write(connection, "\r", 1); /* the prompt is always placed at the line beginning */
  79         return telnet_write(connection, t_con->prompt, strlen(t_con->prompt));
  80 }
  81
  82 int telnet_outputline(connection_t *connection, const char *line)
  83 {
  84         int len;
  85
  86         /* process lines in buffer */
  87         while (*line) {
  88                 char *line_end = strchr(line, '\n');
  89
  90                 if (line_end)
  91                         len = line_end-line;
  92                 else
  93                         len = strlen(line);
  94
  95                 telnet_write(connection, line, len);
  96                 if (line_end)
  97                 {
  98                         telnet_write(connection, "\r\n", 2);
  99                         line += len+1;
 100                 }
 101                 else
 102                 {
 103                         line += len;
 104                 }
 105         }
 106
 107         return ERROR_OK;
 108 }
 109
 110 int telnet_output(struct command_context_s *cmd_ctx, const char* line)
 111 {
 112         connection_t *connection = cmd_ctx->output_handler_priv;
 113
 114         return telnet_outputline(connection, line);
 115 }
 116
 117 void telnet_log_callback(void *priv, const char *file, int line,
 118                 const char *function, const char *string)
 119 {
 120         connection_t *connection = priv;
 121         telnet_connection_t *t_con = connection->priv;
 122         int i;
 123
 124         /* if there is no prompt, simply output the message */
 125         if (t_con->line_cursor < 0)
 126         {
 127                 telnet_outputline(connection, string);
 128                 return;
 129         }
 130
 131         /* clear the command line */
 132         telnet_write(connection, "\r", 1);
 133         for (i = strlen(t_con->prompt) + t_con->line_size; i>0; i-=16)
 134                 telnet_write(connection, "                ", i>16 ? 16 : i);
 135         telnet_write(connection, "\r", 1);
 136
 137         /* output the message */
 138         telnet_outputline(connection, string);
 139
 140         /* put the command line to its previous state */
 141         telnet_prompt(connection);
 142         telnet_write(connection, t_con->line, t_con->line_size);
 143         for (i=t_con->line_size; i>t_con->line_cursor; i--)
 144                 telnet_write(connection, "\b", 1);
 145 }
 146
 147 int telnet_target_callback_event_handler(struct target_s *target, enum target_event event, void *priv)
 148 {
 149         switch (event)
 150         {
 151                 case TARGET_EVENT_HALTED:
 152                         target_arch_state(target);
 153                         break;
 154                 default:
 155                         break;
 156         }
 157
 158         return ERROR_OK;
 159 }
 160
 161 int telnet_new_connection(connection_t *connection)
 162 {
 163         telnet_connection_t *telnet_connection = malloc(sizeof(telnet_connection_t));
 164         telnet_service_t *telnet_service = connection->service->priv;
 165         int i;
 166
 167         connection->priv = telnet_connection;
 168
 169         /* initialize telnet connection information */
 170         telnet_connection->closed = 0;
 171         telnet_connection->line_size = 0;
 172         telnet_connection->line_cursor = 0;
 173         telnet_connection->option_size = 0;
 174         telnet_connection->prompt = strdup("> ");
 175         telnet_connection->state = TELNET_STATE_DATA;
 176
 177         /* output goes through telnet connection */
 178         command_set_output_handler(connection->cmd_ctx, telnet_output, connection);
 179
 180         /* negotiate telnet options */
 181         telnet_write(connection, negotiate, strlen(negotiate));
 182
 183         /* print connection banner */
 184         if (telnet_service->banner)
 185         {
 186                 telnet_write(connection, telnet_service->banner, strlen(telnet_service->banner));
 187                 telnet_write(connection, "\r\n", 2);
 188         }
 189
 190         telnet_prompt(connection);
 191
 192         /* initialize history */
 193         for (i = 0; i < TELNET_LINE_HISTORY_SIZE; i++)
 194         {
 195                 telnet_connection->history[i] = NULL;
 196         }
 197         telnet_connection->next_history = 0;
 198         telnet_connection->current_history = 0;
 199
 200         target_register_event_callback(telnet_target_callback_event_handler, connection->cmd_ctx);
 201
 202         log_add_callback(telnet_log_callback, connection);
 203
 204
 205
 206         return ERROR_OK;
 207 }
 208
 209 void telnet_clear_line(connection_t *connection, telnet_connection_t *t_con)
 210 {
 211         /* move to end of line */
 212         if (t_con->line_cursor < t_con->line_size)
 213         {
 214                 telnet_write(connection, t_con->line + t_con->line_cursor, t_con->line_size - t_con->line_cursor);
 215         }
 216
 217         /* backspace, overwrite with space, backspace */
 218         while (t_con->line_size > 0)
 219         {
 220                 telnet_write(connection, "\b \b", 3);
 221                 t_con->line_size--;
 222         }
 223         t_con->line_cursor = 0;
 224 }
 225
 226 int telnet_input(connection_t *connection)
 227 {
 228         int bytes_read;
 229         char buffer[TELNET_BUFFER_SIZE];
 230         char *buf_p;
 231         telnet_connection_t *t_con = connection->priv;
 232         command_context_t *command_context = connection->cmd_ctx;
 233
 234         bytes_read = read_socket(connection->fd, buffer, TELNET_BUFFER_SIZE);
 235
 236         if (bytes_read == 0)
 237                 return ERROR_SERVER_REMOTE_CLOSED;
 238         else if (bytes_read == -1)
 239         {
 240                 LOG_ERROR("error during read: %s", strerror(errno));
 241                 return ERROR_SERVER_REMOTE_CLOSED;
 242         }
 243
 244         buf_p = buffer;
 245         while (bytes_read)
 246         {
 247                 switch (t_con->state)
 248                 {
 249                         case TELNET_STATE_DATA:
 250                                 if (*buf_p == '\xff')
 251                                 {
 252                                         t_con->state = TELNET_STATE_IAC;
 253                                 }
 254                                 else
 255                                 {
 256                                         if (isprint(*buf_p)) /* printable character */
 257                                         {
 258                                                 /* watch buffer size leaving one spare character for string null termination */
 259                                                 if (t_con->line_size == TELNET_LINE_MAX_SIZE-1)
 260                                                 {
 261                                                         /* output audible bell if buffer is full */
 262                                                         telnet_write(connection, "\x07", 1); /* "\a" does not work, at least on windows */
 263                                                 }
 264                                                 else if (t_con->line_cursor == t_con->line_size)
 265                                                 {
 266                                                         telnet_write(connection, buf_p, 1);
 267                                                         t_con->line[t_con->line_size++] = *buf_p;
 268                                                         t_con->line_cursor++;
 269                                                 }
 270                                                 else
 271                                                 {
 272                                                         int i;
 273                                                         memmove(t_con->line + t_con->line_cursor + 1, t_con->line + t_con->line_cursor, t_con->line_size - t_con->line_cursor);
 274                                                         t_con->line[t_con->line_cursor] = *buf_p;
 275                                                         t_con->line_size++;
 276                                                         telnet_write(connection, t_con->line + t_con->line_cursor, t_con->line_size - t_con->line_cursor);
 277                                                         t_con->line_cursor++;
 278                                                         for (i = t_con->line_cursor; i < t_con->line_size; i++)
 279                                                         {
 280                                                                 telnet_write(connection, "\b", 1);
 281                                                         }
 282                                                 }
 283                                         }
 284                                         else /* non-printable */
 285                                         {
 286                                                 if (*buf_p == 0x1b) /* escape */
 287                                                 {
 288                                                         t_con->state = TELNET_STATE_ESCAPE;
 289                                                         t_con->last_escape = '\x00';
 290                                                 }
 291                                                 else if ((*buf_p == 0xd) || (*buf_p == 0xa)) /* CR/LF */
 292                                                 {
 293                                                         int retval;
 294
 295                                                         /* skip over combinations with CR/LF and NUL characters */
 296                                                         if ((bytes_read > 1) && ((*(buf_p + 1) == 0xa) || (*(buf_p + 1) == 0xd)))
 297                                                         {
 298                                                                 buf_p++;
 299                                                                 bytes_read--;
 300                                                         }
 301                                                         if ((bytes_read > 1) && (*(buf_p + 1) == 0))
 302                                                         {
 303                                                                 buf_p++;
 304                                                                 bytes_read--;
 305                                                         }
 306                                                         t_con->line[t_con->line_size] = 0;
 307
 308                                                         telnet_write(connection, "\r\n\x00", 3);
 309
 310                                                         if (strcmp(t_con->line, "history") == 0)
 311                                                         {
 312                                                                 int i;
 313                                                                 for (i = 1; i < TELNET_LINE_HISTORY_SIZE; i++)
 314                                                                 {
 315                                                                         /* the t_con->next_history line contains empty string (unless NULL), thus it is not printed */
 316                                                                         char *history_line = t_con->history[(t_con->next_history + i) % TELNET_LINE_HISTORY_SIZE];
 317                                                                         if (history_line)
 318                                                                         {
 319                                                                                 telnet_write(connection, history_line, strlen(history_line));
 320                                                                                 telnet_write(connection, "\r\n\x00", 3);
 321                                                                         }
 322                                                                 }
 323                                                                 t_con->line_size = 0;
 324                                                                 t_con->line_cursor = 0;
 325                                                                 continue;
 326                                                         }
 327
 328                                                         /* save only non-blank not repeating lines in the history */
 329                                                         char *prev_line = t_con->history[(t_con->current_history > 0) ? t_con->current_history - 1 : TELNET_LINE_HISTORY_SIZE-1];
 330                                                         if (*t_con->line && (prev_line == NULL || strcmp(t_con->line, prev_line)))
 331                                                         {
 332                                                                 /* if the history slot is already taken, free it */
 333                                                                 if (t_con->history[t_con->next_history])
 334                                                                 {
 335                                                                         free(t_con->history[t_con->next_history]);
 336                                                                 }
 337
 338                                                                 /* add line to history */
 339                                                                 t_con->history[t_con->next_history] = strdup(t_con->line);
 340
 341                                                                 /* wrap history at TELNET_LINE_HISTORY_SIZE */
 342                                                                 t_con->next_history = (t_con->next_history + 1) % TELNET_LINE_HISTORY_SIZE;
 343
 344                                                                 /* current history line starts at the new entry */
 345                                                                 t_con->current_history = t_con->next_history;
 346
 347                                                                 if (t_con->history[t_con->current_history])
 348                                                                 {
 349                                                                         free(t_con->history[t_con->current_history]);
 350                                                                 }
 351                                                                 t_con->history[t_con->current_history] = strdup("");
 352                                                         }
 353
 354                                                         t_con->line_size = 0;
 355
 356                                                         t_con->line_cursor = -1; /* to supress prompt in log callback during command execution */
 357                                                         retval = command_run_line(command_context, t_con->line);
 358                                                         t_con->line_cursor = 0;
 359
 360                                                         if (retval == ERROR_COMMAND_CLOSE_CONNECTION)
 361                                                                 return ERROR_SERVER_REMOTE_CLOSED;
 362
 363                                                         retval = telnet_prompt(connection);
 364                                                         if (retval == ERROR_SERVER_REMOTE_CLOSED)
 365                                                                 return ERROR_SERVER_REMOTE_CLOSED;
 366
 367                                                 }
 368                                                 else if ((*buf_p == 0x7f) || (*buf_p == 0x8)) /* delete character */
 369                                                 {
 370                                                         if (t_con->line_cursor > 0)
 371                                                         {
 372                                                                 if (t_con->line_cursor != t_con->line_size)
 373                                                                 {
 374                                                                         int i;
 375                                                                         telnet_write(connection, "\b", 1);
 376                                                                         t_con->line_cursor--;
 377                                                                         t_con->line_size--;
 378                                                                         memmove(t_con->line + t_con->line_cursor, t_con->line + t_con->line_cursor + 1, t_con->line_size - t_con->line_cursor);
 379
 380                                                                         telnet_write(connection, t_con->line + t_con->line_cursor, t_con->line_size - t_con->line_cursor);
 381                                                                         telnet_write(connection, " \b", 2);
 382                                                                         for (i = t_con->line_cursor; i < t_con->line_size; i++)
 383                                                                         {
 384                                                                                 telnet_write(connection, "\b", 1);
 385                                                                         }
 386                                                                 }
 387                                                                 else
 388                                                                 {
 389                                                                         t_con->line_size--;
 390                                                                         t_con->line_cursor--;
 391                                                                         /* back space: move the 'printer' head one char back, overwrite with space, move back again */
 392                                                                         telnet_write(connection, "\b \b", 3);
 393                                                                 }
 394                                                         }
 395                                                 }
 396                                                 else if (*buf_p == 0x15) /* clear line */
 397                                                 {
 398                                                         telnet_clear_line(connection, t_con);
 399                                                 }
 400                                                 else if (*buf_p == CTRL('B')) /* cursor left */
 401                                                 {
 402                                                         if (t_con->line_cursor > 0)
 403                                                         {
 404                                                                 telnet_write(connection, "\b", 1);
 405                                                                 t_con->line_cursor--;
 406                                                         }
 407                                                         t_con->state = TELNET_STATE_DATA;
 408                                                 }
 409                                                 else if (*buf_p == CTRL('F')) /* cursor right */
 410                                                 {
 411                                                         if (t_con->line_cursor < t_con->line_size)
 412                                                         {
 413                                                                 telnet_write(connection, t_con->line + t_con->line_cursor++, 1);
 414                                                         }
 415                                                         t_con->state = TELNET_STATE_DATA;
 416                                                 }
 417                                                 else
 418                                                 {
 419                                                         LOG_DEBUG("unhandled nonprintable: %2.2x", *buf_p);
 420                                                 }
 421                                         }
 422                                 }
 423                                 break;
 424                         case TELNET_STATE_IAC:
 425                                 switch (*buf_p)
 426                                 {
 427                                         case '\xfe':
 428                                                 t_con->state = TELNET_STATE_DONT;
 429                                                 break;
 430                                         case '\xfd':
 431                                                 t_con->state = TELNET_STATE_DO;
 432                                                 break;
 433                                         case '\xfc':
 434                                                 t_con->state = TELNET_STATE_WONT;
 435                                                 break;
 436                                         case '\xfb':
 437                                                 t_con->state = TELNET_STATE_WILL;
 438                                                 break;
 439                                 }
 440                                 break;
 441                         case TELNET_STATE_SB:
 442                                 break;
 443                         case TELNET_STATE_SE:
 444                                 break;
 445                         case TELNET_STATE_WILL:
 446                         case TELNET_STATE_WONT:
 447                         case TELNET_STATE_DO:
 448                         case TELNET_STATE_DONT:
 449                                 t_con->state = TELNET_STATE_DATA;
 450                                 break;
 451                         case TELNET_STATE_ESCAPE:
 452                                 if (t_con->last_escape == '[')
 453                                 {
 454                                         if (*buf_p == 'D') /* cursor left */
 455                                         {
 456                                                 if (t_con->line_cursor > 0)
 457                                                 {
 458                                                         telnet_write(connection, "\b", 1);
 459                                                         t_con->line_cursor--;
 460                                                 }
 461                                                 t_con->state = TELNET_STATE_DATA;
 462                                         }
 463                                         else if (*buf_p == 'C') /* cursor right */
 464                                         {
 465                                                 if (t_con->line_cursor < t_con->line_size)
 466                                                 {
 467                                                         telnet_write(connection, t_con->line + t_con->line_cursor++, 1);
 468                                                 }
 469                                                 t_con->state = TELNET_STATE_DATA;
 470                                         }
 471                                         else if (*buf_p == 'A') /* cursor up */
 472                                         {
 473                                                 int last_history = (t_con->current_history > 0) ? t_con->current_history - 1 : TELNET_LINE_HISTORY_SIZE-1;
 474                                                 if (t_con->history[last_history])
 475                                                 {
 476                                                         telnet_clear_line(connection, t_con);
 477                                                         t_con->line_size = strlen(t_con->history[last_history]);
 478                                                         t_con->line_cursor = t_con->line_size;
 479                                                         memcpy(t_con->line, t_con->history[last_history], t_con->line_size);
 480                                                         telnet_write(connection, t_con->line, t_con->line_size);
 481                                                         t_con->current_history = last_history;
 482                                                 }
 483                                                 t_con->state = TELNET_STATE_DATA;
 484                                         }
 485                                         else if (*buf_p == 'B') /* cursor down */
 486                                         {
 487                                                 int next_history = (t_con->current_history + 1) % TELNET_LINE_HISTORY_SIZE;
 488                                                 if (t_con->history[next_history])
 489                                                 {
 490                                                         telnet_clear_line(connection, t_con);
 491                                                         t_con->line_size = strlen(t_con->history[next_history]);
 492                                                         t_con->line_cursor = t_con->line_size;
 493                                                         memcpy(t_con->line, t_con->history[next_history], t_con->line_size);
 494                                                         telnet_write(connection, t_con->line, t_con->line_size);
 495                                                         t_con->current_history = next_history;
 496                                                 }
 497                                                 t_con->state = TELNET_STATE_DATA;
 498                                         }
 499                                         else if (*buf_p == '3')
 500                                         {
 501                                                 t_con->last_escape = *buf_p;
 502                                         }
 503                                         else
 504                                         {
 505                                                 t_con->state = TELNET_STATE_DATA;
 506                                         }
 507                                 }
 508                                 else if (t_con->last_escape == '3')
 509                                 {
 510                                         /* Remove character */
 511                                         if (*buf_p == '~')
 512                                         {
 513                                                 if (t_con->line_cursor < t_con->line_size)
 514                                                 {
 515                                                         int i;
 516                                                         t_con->line_size--;
 517                                                         /* remove char from line buffer */
 518                                                         memmove(t_con->line + t_con->line_cursor, t_con->line + t_con->line_cursor + 1, t_con->line_size - t_con->line_cursor);
 519
 520                                                         /* print remainder of buffer */
 521                                                         telnet_write(connection, t_con->line + t_con->line_cursor, t_con->line_size - t_con->line_cursor);
 522                                                         /* overwrite last char with whitespace */
 523                                                         telnet_write(connection, " \b", 2);
 524
 525                                                         /* move back to cursor position*/
 526                                                         for (i = t_con->line_cursor; i < t_con->line_size; i++)
 527                                                         {
 528                                                                 telnet_write(connection, "\b", 1);
 529                                                         }
 530                                                 }
 531
 532                                                 t_con->state = TELNET_STATE_DATA;
 533                                         }
 534                                         else
 535                                         {
 536                                                 t_con->state = TELNET_STATE_DATA;
 537                                         }
 538                                 }
 539                                 else if (t_con->last_escape == '\x00')
 540                                 {
 541                                         if (*buf_p == '[')
 542                                         {
 543                                                 t_con->last_escape = *buf_p;
 544                                         }
 545                                         else
 546                                         {
 547                                                 t_con->state = TELNET_STATE_DATA;
 548                                         }
 549                                 }
 550                                 else
 551                                 {
 552                                         LOG_ERROR("BUG: unexpected value in t_con->last_escape");
 553                                         t_con->state = TELNET_STATE_DATA;
 554                                 }
 555
 556                                 break;
 557                         default:
 558                                 LOG_ERROR("unknown telnet state");
 559                                 exit(-1);
 560                 }
 561
 562                 bytes_read--;
 563                 buf_p++;
 564         }
 565
 566         return ERROR_OK;
 567 }
 568
 569 int telnet_connection_closed(connection_t *connection)
 570 {
 571         telnet_connection_t *t_con = connection->priv;
 572         int i;
 573
 574         log_remove_callback(telnet_log_callback, connection);
 575
 576         if (t_con->prompt)
 577         {
 578                 free(t_con->prompt);
 579                 t_con->prompt = NULL;
 580         }
 581
 582         for (i = 0; i < TELNET_LINE_HISTORY_SIZE; i++)
 583         {
 584                 if (t_con->history[i])
 585                 {
 586                         free(t_con->history[i]);
 587                         t_con->history[i] = NULL;
 588                 }
 589         }
 590
 591         /* if this connection registered a debug-message receiver delete it */
 592         delete_debug_msg_receiver(connection->cmd_ctx, NULL);
 593
 594         if (connection->priv)
 595         {
 596                 free(connection->priv);
 597                 connection->priv = NULL;
 598         }
 599         else
 600         {
 601                 LOG_ERROR("BUG: connection->priv == NULL");
 602         }
 603
 604         target_unregister_event_callback(telnet_target_callback_event_handler, connection->cmd_ctx);
 605
 606         return ERROR_OK;
 607 }
 608
 609 int telnet_set_prompt(connection_t *connection, char *prompt)
 610 {
 611         telnet_connection_t *t_con = connection->priv;
 612
 613         if (t_con->prompt != NULL)
 614                 free(t_con->prompt);
 615
 616         t_con->prompt = strdup(prompt);
 617
 618         return ERROR_OK;
 619 }
 620
 621 int telnet_init(char *banner)
 622 {
 623         telnet_service_t *telnet_service = malloc(sizeof(telnet_service_t));
 624
 625         if (telnet_port == 0)
 626         {
 627                 LOG_WARNING("no telnet port specified, using default port 4444");
 628                 telnet_port = 4444;
 629         }
 630
 631         telnet_service->banner = banner;
 632
 633         add_service("telnet", CONNECTION_TELNET, telnet_port, 1, telnet_new_connection, telnet_input, telnet_connection_closed, telnet_service);
 634
 635         return ERROR_OK;
 636 }
 637
 638 int telnet_register_commands(command_context_t *command_context)
 639 {
 640         register_command(command_context, NULL, "exit", handle_exit_command,
 641                                          COMMAND_EXEC, "exit telnet session");
 642
 643         register_command(command_context, NULL, "telnet_port", handle_telnet_port_command,
 644                                          COMMAND_CONFIG, "");
 645
 646         return ERROR_OK;
 647 }
 648
 649 /* daemon configuration command telnet_port */
 650 int handle_telnet_port_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc)
 651 {
 652         if (argc == 0)
 653                 return ERROR_OK;
 654
 655         telnet_port = strtoul(args[0], NULL, 0);
 656
 657         return ERROR_OK;
 658 }
 659
 660 int handle_exit_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc)
 661 {
 662         return ERROR_COMMAND_CLOSE_CONNECTION;
 663 }