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server/telnet: Handle Ctrl+K
[openocd.git] / src / server / telnet_server.c
blob407ab68aefcd74d41d31f205e6e16fb3828cbef2
1 /***************************************************************************
2 * Copyright (C) 2005 by Dominic Rath *
3 * Dominic.Rath@gmx.de *
4 * *
5 * Copyright (C) 2007-2010 Øyvind Harboe *
6 * oyvind.harboe@zylin.com *
7 * *
8 * Copyright (C) 2008 by Spencer Oliver *
9 * spen@spen-soft.co.uk *
10 * *
11 * This program is free software; you can redistribute it and/or modify *
12 * it under the terms of the GNU General Public License as published by *
13 * the Free Software Foundation; either version 2 of the License, or *
14 * (at your option) any later version. *
15 * *
16 * This program is distributed in the hope that it will be useful, *
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of *
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
19 * GNU General Public License for more details. *
20 * *
21 * You should have received a copy of the GNU General Public License *
22 * along with this program. If not, see <http://www.gnu.org/licenses/>. *
23 ***************************************************************************/
24
25 #ifdef HAVE_CONFIG_H
26 #include "config.h"
27 #endif
28
29 #include "telnet_server.h"
30 #include <target/target_request.h>
31 #include <helper/configuration.h>
32
33 static char *telnet_port;
34
35 static char *negotiate =
36 "\xFF\xFB\x03" /* IAC WILL Suppress Go Ahead */
37 "\xFF\xFB\x01" /* IAC WILL Echo */
38 "\xFF\xFD\x03" /* IAC DO Suppress Go Ahead */
39 "\xFF\xFE\x01"; /* IAC DON'T Echo */
40
41 #define CTRL(c) (c - '@')
42 #define TELNET_HISTORY ".openocd_history"
43
44 /* The only way we can detect that the socket is closed is the first time
45 * we write to it, we will fail. Subsequent write operations will
46 * succeed. Shudder!
47 */
48 static int telnet_write(struct connection *connection, const void *data,
49 int len)
50 {
51 struct telnet_connection *t_con = connection->priv;
52 if (t_con->closed)
53 return ERROR_SERVER_REMOTE_CLOSED;
54
55 if (connection_write(connection, data, len) == len)
56 return ERROR_OK;
57 t_con->closed = true;
58 return ERROR_SERVER_REMOTE_CLOSED;
59 }
60
61 static int telnet_prompt(struct connection *connection)
62 {
63 struct telnet_connection *t_con = connection->priv;
64
65 return telnet_write(connection, t_con->prompt, strlen(t_con->prompt));
66 }
67
68 static int telnet_outputline(struct connection *connection, const char *line)
69 {
70 int len;
71
72 /* process lines in buffer */
73 while (*line) {
74 char *line_end = strchr(line, '\n');
75
76 if (line_end)
77 len = line_end-line;
78 else
79 len = strlen(line);
80
81 telnet_write(connection, line, len);
82 if (line_end) {
83 telnet_write(connection, "\r\n", 2);
84 line += len + 1;
85 } else
86 line += len;
87 }
88
89 return ERROR_OK;
90 }
91
92 static int telnet_output(struct command_context *cmd_ctx, const char *line)
93 {
94 struct connection *connection = cmd_ctx->output_handler_priv;
95
96 return telnet_outputline(connection, line);
97 }
98
99 static void telnet_log_callback(void *priv, const char *file, unsigned line,
100 const char *function, const char *string)
101 {
102 struct connection *connection = priv;
103 struct telnet_connection *t_con = connection->priv;
104 size_t i;
105 size_t tmp;
106
107 /* If the prompt is not visible, simply output the message. */
108 if (!t_con->prompt_visible) {
109 telnet_outputline(connection, string);
110 return;
111 }
112
113 /* Clear the command line. */
114 tmp = strlen(t_con->prompt) + t_con->line_size;
115
116 for (i = 0; i < tmp; i += 16)
117 telnet_write(connection, "\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b",
118 MIN(tmp - i, 16));
119
120 for (i = 0; i < tmp; i += 16)
121 telnet_write(connection, " ", MIN(tmp - i, 16));
122
123 for (i = 0; i < tmp; i += 16)
124 telnet_write(connection, "\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b",
125 MIN(tmp - i, 16));
126
127 telnet_outputline(connection, string);
128
129 /* Put the command line to its previous state. */
130 telnet_prompt(connection);
131 telnet_write(connection, t_con->line, t_con->line_size);
132
133 for (i = t_con->line_cursor; i < t_con->line_size; i++)
134 telnet_write(connection, "\b", 1);
135 }
136
137 static void telnet_load_history(struct telnet_connection *t_con)
138 {
139 FILE *histfp;
140 char buffer[TELNET_BUFFER_SIZE];
141 int i = 0;
142
143 char *history = get_home_dir(TELNET_HISTORY);
144
145 if (history == NULL) {
146 LOG_INFO("unable to get user home directory, telnet history will be disabled");
147 return;
148 }
149
150 histfp = fopen(history, "rb");
151
152 if (histfp) {
153
154 while (fgets(buffer, sizeof(buffer), histfp) != NULL) {
155
156 char *p = strchr(buffer, '\n');
157 if (p)
158 *p = '\0';
159 if (buffer[0] && i < TELNET_LINE_HISTORY_SIZE)
160 t_con->history[i++] = strdup(buffer);
161 }
162
163 t_con->next_history = i;
164 t_con->next_history %= TELNET_LINE_HISTORY_SIZE;
165 /* try to set to last entry - 1, that way we skip over any exit/shutdown cmds */
166 t_con->current_history = t_con->next_history > 0 ? i - 1 : 0;
167 fclose(histfp);
168 }
169
170 free(history);
171 }
172
173 static void telnet_save_history(struct telnet_connection *t_con)
174 {
175 FILE *histfp;
176 int i;
177 int num;
178
179 char *history = get_home_dir(TELNET_HISTORY);
180
181 if (history == NULL) {
182 LOG_INFO("unable to get user home directory, telnet history will be disabled");
183 return;
184 }
185
186 histfp = fopen(history, "wb");
187
188 if (histfp) {
189
190 num = TELNET_LINE_HISTORY_SIZE;
191 i = t_con->current_history + 1;
192 i %= TELNET_LINE_HISTORY_SIZE;
193
194 while (t_con->history[i] == NULL && num > 0) {
195 i++;
196 i %= TELNET_LINE_HISTORY_SIZE;
197 num--;
198 }
199
200 if (num > 0) {
201 for (; num > 0; num--) {
202 fprintf(histfp, "%s\n", t_con->history[i]);
203 i++;
204 i %= TELNET_LINE_HISTORY_SIZE;
205 }
206 }
207 fclose(histfp);
208 }
209
210 free(history);
211 }
212
213 static int telnet_new_connection(struct connection *connection)
214 {
215 struct telnet_connection *telnet_connection;
216 struct telnet_service *telnet_service = connection->service->priv;
217 int i;
218
219 telnet_connection = malloc(sizeof(struct telnet_connection));
220
221 if (!telnet_connection) {
222 LOG_ERROR("Failed to allocate telnet connection.");
223 return ERROR_FAIL;
224 }
225
226 connection->priv = telnet_connection;
227
228 /* initialize telnet connection information */
229 telnet_connection->closed = false;
230 telnet_connection->line_size = 0;
231 telnet_connection->line_cursor = 0;
232 telnet_connection->prompt = strdup("> ");
233 telnet_connection->prompt_visible = true;
234 telnet_connection->state = TELNET_STATE_DATA;
235
236 /* output goes through telnet connection */
237 command_set_output_handler(connection->cmd_ctx, telnet_output, connection);
238
239 /* negotiate telnet options */
240 telnet_write(connection, negotiate, strlen(negotiate));
241
242 /* print connection banner */
243 if (telnet_service->banner) {
244 telnet_write(connection, telnet_service->banner, strlen(telnet_service->banner));
245 telnet_write(connection, "\r\n", 2);
246 }
247
248 /* the prompt is always placed at the line beginning */
249 telnet_write(connection, "\r", 1);
250 telnet_prompt(connection);
251
252 /* initialize history */
253 for (i = 0; i < TELNET_LINE_HISTORY_SIZE; i++)
254 telnet_connection->history[i] = NULL;
255 telnet_connection->next_history = 0;
256 telnet_connection->current_history = 0;
257 telnet_load_history(telnet_connection);
258
259 log_add_callback(telnet_log_callback, connection);
260
261 return ERROR_OK;
262 }
263
264 static void telnet_clear_line(struct connection *connection,
265 struct telnet_connection *t_con)
266 {
267 /* move to end of line */
268 if (t_con->line_cursor < t_con->line_size)
269 telnet_write(connection,
270 t_con->line + t_con->line_cursor,
271 t_con->line_size - t_con->line_cursor);
272
273 /* backspace, overwrite with space, backspace */
274 while (t_con->line_size > 0) {
275 telnet_write(connection, "\b \b", 3);
276 t_con->line_size--;
277 }
278 t_con->line_cursor = 0;
279 }
280
281 static void telnet_history_go(struct connection *connection, int idx)
282 {
283 struct telnet_connection *t_con = connection->priv;
284
285 if (t_con->history[idx]) {
286 telnet_clear_line(connection, t_con);
287 t_con->line_size = strlen(t_con->history[idx]);
288 t_con->line_cursor = t_con->line_size;
289 memcpy(t_con->line, t_con->history[idx], t_con->line_size);
290 telnet_write(connection, t_con->line, t_con->line_size);
291 t_con->current_history = idx;
292 }
293 t_con->state = TELNET_STATE_DATA;
294 }
295
296 static void telnet_history_up(struct connection *connection)
297 {
298 struct telnet_connection *t_con = connection->priv;
299
300 size_t last_history = (t_con->current_history > 0) ?
301 t_con->current_history - 1 :
302 TELNET_LINE_HISTORY_SIZE-1;
303 telnet_history_go(connection, last_history);
304 }
305
306 static void telnet_history_down(struct connection *connection)
307 {
308 struct telnet_connection *t_con = connection->priv;
309 size_t next_history;
310
311 next_history = (t_con->current_history + 1) % TELNET_LINE_HISTORY_SIZE;
312 telnet_history_go(connection, next_history);
313 }
314
315 static int telnet_history_print(struct connection *connection)
316 {
317 struct telnet_connection *tc;
318
319 tc = connection->priv;
320
321 for (size_t i = 1; i < TELNET_LINE_HISTORY_SIZE; i++) {
322 char *line;
323
324 /*
325 * The tc->next_history line contains empty string (unless NULL), thus
326 * it is not printed.
327 */
328 line = tc->history[(tc->next_history + i) % TELNET_LINE_HISTORY_SIZE];
329
330 if (line) {
331 telnet_write(connection, line, strlen(line));
332 telnet_write(connection, "\r\n\x00", 3);
333 }
334 }
335
336 tc->line_size = 0;
337 tc->line_cursor = 0;
338
339 /* The prompt is always placed at the line beginning. */
340 telnet_write(connection, "\r", 1);
341
342 return telnet_prompt(connection);
343 }
344
345 static void telnet_move_cursor(struct connection *connection, size_t pos)
346 {
347 struct telnet_connection *tc;
348 size_t tmp;
349
350 tc = connection->priv;
351
352 if (pos < tc->line_cursor) {
353 tmp = tc->line_cursor - pos;
354
355 for (size_t i = 0; i < tmp; i += 16)
356 telnet_write(connection, "\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b",
357 MIN(tmp - i, 16));
358 } else {
359 tmp = pos - tc->line_cursor;
360
361 for (size_t i = 0; i < tmp; i += 16)
362 telnet_write(connection, tc->line + tc->line_cursor + i,
363 MIN(tmp - i, 16));
364 }
365
366 tc->line_cursor = pos;
367 }
368
369 static int telnet_input(struct connection *connection)
370 {
371 int bytes_read;
372 unsigned char buffer[TELNET_BUFFER_SIZE];
373 unsigned char *buf_p;
374 struct telnet_connection *t_con = connection->priv;
375 struct command_context *command_context = connection->cmd_ctx;
376
377 bytes_read = connection_read(connection, buffer, TELNET_BUFFER_SIZE);
378
379 if (bytes_read == 0)
380 return ERROR_SERVER_REMOTE_CLOSED;
381 else if (bytes_read == -1) {
382 LOG_ERROR("error during read: %s", strerror(errno));
383 return ERROR_SERVER_REMOTE_CLOSED;
384 }
385
386 buf_p = buffer;
387 while (bytes_read) {
388 switch (t_con->state) {
389 case TELNET_STATE_DATA:
390 if (*buf_p == 0xff)
391 t_con->state = TELNET_STATE_IAC;
392 else {
393 if (isprint(*buf_p)) { /* printable character */
394 /* watch buffer size leaving one spare character for
395 * string null termination */
396 if (t_con->line_size == TELNET_LINE_MAX_SIZE-1) {
397 /* output audible bell if buffer is full
398 * "\a" does not work, at least on windows */
399 telnet_write(connection, "\x07", 1);
400 } else if (t_con->line_cursor == t_con->line_size) {
401 telnet_write(connection, buf_p, 1);
402 t_con->line[t_con->line_size++] = *buf_p;
403 t_con->line_cursor++;
404 } else {
405 size_t i;
406 memmove(t_con->line + t_con->line_cursor + 1,
407 t_con->line + t_con->line_cursor,
408 t_con->line_size - t_con->line_cursor);
409 t_con->line[t_con->line_cursor] = *buf_p;
410 t_con->line_size++;
411 telnet_write(connection,
412 t_con->line + t_con->line_cursor,
413 t_con->line_size - t_con->line_cursor);
414 t_con->line_cursor++;
415 for (i = t_con->line_cursor; i < t_con->line_size; i++)
416 telnet_write(connection, "\b", 1);
417 }
418 } else { /* non-printable */
419 if (*buf_p == 0x1b) { /* escape */
420 t_con->state = TELNET_STATE_ESCAPE;
421 t_con->last_escape = '\x00';
422 } else if ((*buf_p == 0xd) || (*buf_p == 0xa)) { /* CR/LF */
423 int retval;
424
425 /* skip over combinations with CR/LF and NUL characters */
426 if ((bytes_read > 1) && ((*(buf_p + 1) == 0xa) ||
427 (*(buf_p + 1) == 0xd))) {
428 buf_p++;
429 bytes_read--;
430 }
431 if ((bytes_read > 1) && (*(buf_p + 1) == 0)) {
432 buf_p++;
433 bytes_read--;
434 }
435 t_con->line[t_con->line_size] = 0;
436
437 telnet_write(connection, "\r\n\x00", 3);
438
439 if (strcmp(t_con->line, "history") == 0) {
440 retval = telnet_history_print(connection);
441
442 if (retval != ERROR_OK)
443 return retval;
444
445 continue;
446 }
447
448 /* save only non-blank not repeating lines in the history */
449 char *prev_line = t_con->history[(t_con->current_history > 0) ?
450 t_con->current_history - 1 : TELNET_LINE_HISTORY_SIZE-1];
451 if (*t_con->line && (prev_line == NULL ||
452 strcmp(t_con->line, prev_line))) {
453 /* if the history slot is already taken, free it */
454 free(t_con->history[t_con->next_history]);
455
456 /* add line to history */
457 t_con->history[t_con->next_history] = strdup(t_con->line);
458
459 /* wrap history at TELNET_LINE_HISTORY_SIZE */
460 t_con->next_history = (t_con->next_history + 1) %
461 TELNET_LINE_HISTORY_SIZE;
462
463 /* current history line starts at the new entry */
464 t_con->current_history =
465 t_con->next_history;
466
467 free(t_con->history[t_con->current_history]);
468 t_con->history[t_con->current_history] = strdup("");
469 }
470
471 t_con->line_size = 0;
472
473 /* to suppress prompt in log callback during command execution */
474 t_con->prompt_visible = false;
475
476 if (strcmp(t_con->line, "shutdown") == 0)
477 telnet_save_history(t_con);
478
479 retval = command_run_line(command_context, t_con->line);
480
481 t_con->line_cursor = 0;
482 t_con->prompt_visible = true;
483
484 if (retval == ERROR_COMMAND_CLOSE_CONNECTION)
485 return ERROR_SERVER_REMOTE_CLOSED;
486
487 /* the prompt is always * placed at the line beginning */
488 telnet_write(connection, "\r", 1);
489
490 retval = telnet_prompt(connection);
491 if (retval == ERROR_SERVER_REMOTE_CLOSED)
492 return ERROR_SERVER_REMOTE_CLOSED;
493
494 } else if ((*buf_p == 0x7f) || (*buf_p == 0x8)) { /* delete character */
495 if (t_con->line_cursor > 0) {
496 if (t_con->line_cursor != t_con->line_size) {
497 size_t i;
498 telnet_write(connection, "\b", 1);
499 t_con->line_cursor--;
500 t_con->line_size--;
501 memmove(t_con->line + t_con->line_cursor,
502 t_con->line + t_con->line_cursor + 1,
503 t_con->line_size -
504 t_con->line_cursor);
505
506 telnet_write(connection,
507 t_con->line + t_con->line_cursor,
508 t_con->line_size -
509 t_con->line_cursor);
510 telnet_write(connection, " \b", 2);
511 for (i = t_con->line_cursor; i < t_con->line_size; i++)
512 telnet_write(connection, "\b", 1);
513 } else {
514 t_con->line_size--;
515 t_con->line_cursor--;
516 /* back space: move the 'printer' head one char
517 * back, overwrite with space, move back again */
518 telnet_write(connection, "\b \b", 3);
519 }
520 }
521 } else if (*buf_p == 0x15) /* clear line */
522 telnet_clear_line(connection, t_con);
523 else if (*buf_p == CTRL('B')) { /* cursor left */
524 if (t_con->line_cursor > 0) {
525 telnet_write(connection, "\b", 1);
526 t_con->line_cursor--;
527 }
528 t_con->state = TELNET_STATE_DATA;
529 } else if (*buf_p == CTRL('F')) { /* cursor right */
530 if (t_con->line_cursor < t_con->line_size)
531 telnet_write(connection, t_con->line + t_con->line_cursor++, 1);
532 t_con->state = TELNET_STATE_DATA;
533 } else if (*buf_p == CTRL('P')) /* cursor up */
534 telnet_history_up(connection);
535 else if (*buf_p == CTRL('N')) /* cursor down */
536 telnet_history_down(connection);
537 else if (*buf_p == CTRL('A'))
538 telnet_move_cursor(connection, 0);
539 else if (*buf_p == CTRL('E'))
540 telnet_move_cursor(connection, t_con->line_size);
541 else if (*buf_p == CTRL('K')) { /* kill line to end */
542 if (t_con->line_cursor < t_con->line_size) {
543 /* overwrite with space, until end of line, move back */
544 for (size_t i = t_con->line_cursor; i < t_con->line_size; i++)
545 telnet_write(connection, " ", 1);
546 for (size_t i = t_con->line_cursor; i < t_con->line_size; i++)
547 telnet_write(connection, "\b", 1);
548 t_con->line[t_con->line_cursor] = '\0';
549 t_con->line_size = t_con->line_cursor;
550 }
551 } else
552 LOG_DEBUG("unhandled nonprintable: %2.2x", *buf_p);
553 }
554 }
555 break;
556 case TELNET_STATE_IAC:
557 switch (*buf_p) {
558 case 0xfe:
559 t_con->state = TELNET_STATE_DONT;
560 break;
561 case 0xfd:
562 t_con->state = TELNET_STATE_DO;
563 break;
564 case 0xfc:
565 t_con->state = TELNET_STATE_WONT;
566 break;
567 case 0xfb:
568 t_con->state = TELNET_STATE_WILL;
569 break;
570 }
571 break;
572 case TELNET_STATE_SB:
573 break;
574 case TELNET_STATE_SE:
575 break;
576 case TELNET_STATE_WILL:
577 case TELNET_STATE_WONT:
578 case TELNET_STATE_DO:
579 case TELNET_STATE_DONT:
580 t_con->state = TELNET_STATE_DATA;
581 break;
582 case TELNET_STATE_ESCAPE:
583 if (t_con->last_escape == '[') {
584 if (*buf_p == 'D') { /* cursor left */
585 if (t_con->line_cursor > 0) {
586 telnet_write(connection, "\b", 1);
587 t_con->line_cursor--;
588 }
589 t_con->state = TELNET_STATE_DATA;
590 } else if (*buf_p == 'C') { /* cursor right */
591 if (t_con->line_cursor < t_con->line_size)
592 telnet_write(connection,
593 t_con->line + t_con->line_cursor++, 1);
594 t_con->state = TELNET_STATE_DATA;
595 } else if (*buf_p == 'A') { /* cursor up */
596 telnet_history_up(connection);
597 } else if (*buf_p == 'B') { /* cursor down */
598 telnet_history_down(connection);
599 } else if (*buf_p == '3')
600 t_con->last_escape = *buf_p;
601 else
602 t_con->state = TELNET_STATE_DATA;
603 } else if (t_con->last_escape == '3') {
604 /* Remove character */
605 if (*buf_p == '~') {
606 if (t_con->line_cursor < t_con->line_size) {
607 size_t i;
608 t_con->line_size--;
609 /* remove char from line buffer */
610 memmove(t_con->line + t_con->line_cursor,
611 t_con->line + t_con->line_cursor + 1,
612 t_con->line_size - t_con->line_cursor);
613
614 /* print remainder of buffer */
615 telnet_write(connection, t_con->line + t_con->line_cursor,
616 t_con->line_size - t_con->line_cursor);
617 /* overwrite last char with whitespace */
618 telnet_write(connection, " \b", 2);
619
620 /* move back to cursor position*/
621 for (i = t_con->line_cursor; i < t_con->line_size; i++)
622 telnet_write(connection, "\b", 1);
623 }
624
625 t_con->state = TELNET_STATE_DATA;
626 } else
627 t_con->state = TELNET_STATE_DATA;
628 } else if (t_con->last_escape == '\x00') {
629 if (*buf_p == '[')
630 t_con->last_escape = *buf_p;
631 else
632 t_con->state = TELNET_STATE_DATA;
633 } else {
634 LOG_ERROR("BUG: unexpected value in t_con->last_escape");
635 t_con->state = TELNET_STATE_DATA;
636 }
637
638 break;
639 default:
640 LOG_ERROR("unknown telnet state");
641 return ERROR_FAIL;
642 }
643
644 bytes_read--;
645 buf_p++;
646 }
647
648 return ERROR_OK;
649 }
650
651 static int telnet_connection_closed(struct connection *connection)
652 {
653 struct telnet_connection *t_con = connection->priv;
654 int i;
655
656 log_remove_callback(telnet_log_callback, connection);
657
658 free(t_con->prompt);
659 t_con->prompt = NULL;
660
661 /* save telnet history */
662 telnet_save_history(t_con);
663
664 for (i = 0; i < TELNET_LINE_HISTORY_SIZE; i++) {
665 free(t_con->history[i]);
666 t_con->history[i] = NULL;
667 }
668
669 /* if this connection registered a debug-message receiver delete it */
670 delete_debug_msg_receiver(connection->cmd_ctx, NULL);
671
672 free(connection->priv);
673 connection->priv = NULL;
674
675 return ERROR_OK;
676 }
677
678 int telnet_init(char *banner)
679 {
680 if (strcmp(telnet_port, "disabled") == 0) {
681 LOG_INFO("telnet server disabled");
682 return ERROR_OK;
683 }
684
685 struct telnet_service *telnet_service =
686 malloc(sizeof(struct telnet_service));
687
688 if (!telnet_service) {
689 LOG_ERROR("Failed to allocate telnet service.");
690 return ERROR_FAIL;
691 }
692
693 telnet_service->banner = banner;
694
695 int ret = add_service("telnet", telnet_port, CONNECTION_LIMIT_UNLIMITED,
696 telnet_new_connection, telnet_input, telnet_connection_closed,
697 telnet_service);
698
699 if (ret != ERROR_OK) {
700 free(telnet_service);
701 return ret;
702 }
703
704 return ERROR_OK;
705 }
706
707 /* daemon configuration command telnet_port */
708 COMMAND_HANDLER(handle_telnet_port_command)
709 {
710 return CALL_COMMAND_HANDLER(server_pipe_command, &telnet_port);
711 }
712
713 COMMAND_HANDLER(handle_exit_command)
714 {
715 return ERROR_COMMAND_CLOSE_CONNECTION;
716 }
717
718 static const struct command_registration telnet_command_handlers[] = {
719 {
720 .name = "exit",
721 .handler = handle_exit_command,
722 .mode = COMMAND_EXEC,
723 .usage = "",
724 .help = "exit telnet session",
725 },
726 {
727 .name = "telnet_port",
728 .handler = handle_telnet_port_command,
729 .mode = COMMAND_CONFIG,
730 .help = "Specify port on which to listen "
731 "for incoming telnet connections. "
732 "Read help on 'gdb_port'.",
733 .usage = "[port_num]",
734 },
735 COMMAND_REGISTRATION_DONE
736 };
737
738 int telnet_register_commands(struct command_context *cmd_ctx)
739 {
740 telnet_port = strdup("4444");
741 return register_commands(cmd_ctx, NULL, telnet_command_handlers);
742 }
743
744 void telnet_service_free(void)
745 {
746 free(telnet_port);
747 }
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