791a1a548535aa32f8638eea38b9f8240279ac71
[openocd.git] / src / server / telnet_server.c
1 /***************************************************************************
2 * Copyright (C) 2005 by Dominic Rath *
3 * Dominic.Rath@gmx.de *
4 * *
5 * Copyright (C) 2007-2010 √ėyvind 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 #include <helper/list.h>
33
34 static char *telnet_port;
35
36 static char *negotiate =
37 "\xFF\xFB\x03" /* IAC WILL Suppress Go Ahead */
38 "\xFF\xFB\x01" /* IAC WILL Echo */
39 "\xFF\xFD\x03" /* IAC DO Suppress Go Ahead */
40 "\xFF\xFE\x01"; /* IAC DON'T Echo */
41
42 #define CTRL(c) (c - '@')
43 #define TELNET_HISTORY ".openocd_history"
44
45 /* The only way we can detect that the socket is closed is the first time
46 * we write to it, we will fail. Subsequent write operations will
47 * succeed. Shudder!
48 */
49 static int telnet_write(struct connection *connection, const void *data,
50 int len)
51 {
52 struct telnet_connection *t_con = connection->priv;
53 if (t_con->closed)
54 return ERROR_SERVER_REMOTE_CLOSED;
55
56 if (connection_write(connection, data, len) == len)
57 return ERROR_OK;
58 t_con->closed = true;
59 return ERROR_SERVER_REMOTE_CLOSED;
60 }
61
62 /* output an audible bell */
63 static int telnet_bell(struct connection *connection)
64 {
65 /* ("\a" does not work, at least on windows) */
66 return telnet_write(connection, "\x07", 1);
67 }
68
69 static int telnet_prompt(struct connection *connection)
70 {
71 struct telnet_connection *t_con = connection->priv;
72
73 return telnet_write(connection, t_con->prompt, strlen(t_con->prompt));
74 }
75
76 static int telnet_outputline(struct connection *connection, const char *line)
77 {
78 int len;
79
80 /* process lines in buffer */
81 while (*line) {
82 char *line_end = strchr(line, '\n');
83
84 if (line_end)
85 len = line_end-line;
86 else
87 len = strlen(line);
88
89 telnet_write(connection, line, len);
90 if (line_end) {
91 telnet_write(connection, "\r\n", 2);
92 line += len + 1;
93 } else
94 line += len;
95 }
96
97 return ERROR_OK;
98 }
99
100 static int telnet_output(struct command_context *cmd_ctx, const char *line)
101 {
102 struct connection *connection = cmd_ctx->output_handler_priv;
103
104 return telnet_outputline(connection, line);
105 }
106
107 static void telnet_log_callback(void *priv, const char *file, unsigned line,
108 const char *function, const char *string)
109 {
110 struct connection *connection = priv;
111 struct telnet_connection *t_con = connection->priv;
112 size_t i;
113 size_t tmp;
114
115 /* If the prompt is not visible, simply output the message. */
116 if (!t_con->prompt_visible) {
117 telnet_outputline(connection, string);
118 return;
119 }
120
121 /* Clear the command line. */
122 tmp = strlen(t_con->prompt) + t_con->line_size;
123
124 for (i = 0; i < tmp; i += 16)
125 telnet_write(connection, "\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b",
126 MIN(tmp - i, 16));
127
128 for (i = 0; i < tmp; i += 16)
129 telnet_write(connection, " ", MIN(tmp - i, 16));
130
131 for (i = 0; i < tmp; i += 16)
132 telnet_write(connection, "\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b",
133 MIN(tmp - i, 16));
134
135 telnet_outputline(connection, string);
136
137 /* Put the command line to its previous state. */
138 telnet_prompt(connection);
139 telnet_write(connection, t_con->line, t_con->line_size);
140
141 for (i = t_con->line_cursor; i < t_con->line_size; i++)
142 telnet_write(connection, "\b", 1);
143 }
144
145 static void telnet_load_history(struct telnet_connection *t_con)
146 {
147 FILE *histfp;
148 char buffer[TELNET_BUFFER_SIZE];
149 int i = 0;
150
151 char *history = get_home_dir(TELNET_HISTORY);
152
153 if (!history) {
154 LOG_INFO("unable to get user home directory, telnet history will be disabled");
155 return;
156 }
157
158 histfp = fopen(history, "rb");
159
160 if (histfp) {
161
162 while (fgets(buffer, sizeof(buffer), histfp)) {
163
164 char *p = strchr(buffer, '\n');
165 if (p)
166 *p = '\0';
167 if (buffer[0] && i < TELNET_LINE_HISTORY_SIZE)
168 t_con->history[i++] = strdup(buffer);
169 }
170
171 t_con->next_history = i;
172 t_con->next_history %= TELNET_LINE_HISTORY_SIZE;
173 /* try to set to last entry - 1, that way we skip over any exit/shutdown cmds */
174 t_con->current_history = t_con->next_history > 0 ? i - 1 : 0;
175 fclose(histfp);
176 }
177
178 free(history);
179 }
180
181 static void telnet_save_history(struct telnet_connection *t_con)
182 {
183 FILE *histfp;
184 int i;
185 int num;
186
187 char *history = get_home_dir(TELNET_HISTORY);
188
189 if (!history) {
190 LOG_INFO("unable to get user home directory, telnet history will be disabled");
191 return;
192 }
193
194 histfp = fopen(history, "wb");
195
196 if (histfp) {
197
198 num = TELNET_LINE_HISTORY_SIZE;
199 i = t_con->current_history + 1;
200 i %= TELNET_LINE_HISTORY_SIZE;
201
202 while (!t_con->history[i] && num > 0) {
203 i++;
204 i %= TELNET_LINE_HISTORY_SIZE;
205 num--;
206 }
207
208 if (num > 0) {
209 for (; num > 0; num--) {
210 fprintf(histfp, "%s\n", t_con->history[i]);
211 i++;
212 i %= TELNET_LINE_HISTORY_SIZE;
213 }
214 }
215 fclose(histfp);
216 }
217
218 free(history);
219 }
220
221 static int telnet_new_connection(struct connection *connection)
222 {
223 struct telnet_connection *telnet_connection;
224 struct telnet_service *telnet_service = connection->service->priv;
225 int i;
226
227 telnet_connection = malloc(sizeof(struct telnet_connection));
228
229 if (!telnet_connection) {
230 LOG_ERROR("Failed to allocate telnet connection.");
231 return ERROR_FAIL;
232 }
233
234 connection->priv = telnet_connection;
235
236 /* initialize telnet connection information */
237 telnet_connection->closed = false;
238 telnet_connection->line_size = 0;
239 telnet_connection->line_cursor = 0;
240 telnet_connection->prompt = strdup("> ");
241 telnet_connection->prompt_visible = true;
242 telnet_connection->state = TELNET_STATE_DATA;
243
244 /* output goes through telnet connection */
245 command_set_output_handler(connection->cmd_ctx, telnet_output, connection);
246
247 /* negotiate telnet options */
248 telnet_write(connection, negotiate, strlen(negotiate));
249
250 /* print connection banner */
251 if (telnet_service->banner) {
252 telnet_write(connection, telnet_service->banner, strlen(telnet_service->banner));
253 telnet_write(connection, "\r\n", 2);
254 }
255
256 /* the prompt is always placed at the line beginning */
257 telnet_write(connection, "\r", 1);
258 telnet_prompt(connection);
259
260 /* initialize history */
261 for (i = 0; i < TELNET_LINE_HISTORY_SIZE; i++)
262 telnet_connection->history[i] = NULL;
263 telnet_connection->next_history = 0;
264 telnet_connection->current_history = 0;
265 telnet_load_history(telnet_connection);
266
267 log_add_callback(telnet_log_callback, connection);
268
269 return ERROR_OK;
270 }
271
272 static void telnet_clear_line(struct connection *connection,
273 struct telnet_connection *t_con)
274 {
275 /* move to end of line */
276 if (t_con->line_cursor < t_con->line_size)
277 telnet_write(connection,
278 t_con->line + t_con->line_cursor,
279 t_con->line_size - t_con->line_cursor);
280
281 /* backspace, overwrite with space, backspace */
282 while (t_con->line_size > 0) {
283 telnet_write(connection, "\b \b", 3);
284 t_con->line_size--;
285 }
286 t_con->line_cursor = 0;
287 }
288
289 static void telnet_history_go(struct connection *connection, int idx)
290 {
291 struct telnet_connection *t_con = connection->priv;
292
293 if (t_con->history[idx]) {
294 telnet_clear_line(connection, t_con);
295 t_con->line_size = strlen(t_con->history[idx]);
296 t_con->line_cursor = t_con->line_size;
297 memcpy(t_con->line, t_con->history[idx], t_con->line_size);
298 telnet_write(connection, t_con->line, t_con->line_size);
299 t_con->current_history = idx;
300 }
301 t_con->state = TELNET_STATE_DATA;
302 }
303
304 static void telnet_history_up(struct connection *connection)
305 {
306 struct telnet_connection *t_con = connection->priv;
307
308 size_t last_history = (t_con->current_history > 0) ?
309 t_con->current_history - 1 :
310 TELNET_LINE_HISTORY_SIZE-1;
311 telnet_history_go(connection, last_history);
312 }
313
314 static void telnet_history_down(struct connection *connection)
315 {
316 struct telnet_connection *t_con = connection->priv;
317 size_t next_history;
318
319 next_history = (t_con->current_history + 1) % TELNET_LINE_HISTORY_SIZE;
320 telnet_history_go(connection, next_history);
321 }
322
323 static void telnet_history_add(struct connection *connection)
324 {
325 struct telnet_connection *t_con = connection->priv;
326
327 /* save only non-blank not repeating lines in the history */
328 char *prev_line = t_con->history[(t_con->current_history > 0) ?
329 t_con->current_history - 1 : TELNET_LINE_HISTORY_SIZE-1];
330
331 if (*t_con->line && (!prev_line || strcmp(t_con->line, prev_line))) {
332 /* if the history slot is already taken, free it */
333 free(t_con->history[t_con->next_history]);
334
335 /* add line to history */
336 t_con->history[t_con->next_history] = strdup(t_con->line);
337
338 /* wrap history at TELNET_LINE_HISTORY_SIZE */
339 t_con->next_history = (t_con->next_history + 1) % TELNET_LINE_HISTORY_SIZE;
340
341 /* current history line starts at the new entry */
342 t_con->current_history = t_con->next_history;
343
344 free(t_con->history[t_con->current_history]);
345 t_con->history[t_con->current_history] = strdup("");
346 }
347 }
348
349 static int telnet_history_print(struct connection *connection)
350 {
351 struct telnet_connection *tc;
352
353 tc = connection->priv;
354
355 for (size_t i = 1; i < TELNET_LINE_HISTORY_SIZE; i++) {
356 char *line;
357
358 /*
359 * The tc->next_history line contains empty string (unless NULL), thus
360 * it is not printed.
361 */
362 line = tc->history[(tc->next_history + i) % TELNET_LINE_HISTORY_SIZE];
363
364 if (line) {
365 telnet_write(connection, line, strlen(line));
366 telnet_write(connection, "\r\n\x00", 3);
367 }
368 }
369
370 tc->line_size = 0;
371 tc->line_cursor = 0;
372
373 /* The prompt is always placed at the line beginning. */
374 telnet_write(connection, "\r", 1);
375
376 return telnet_prompt(connection);
377 }
378
379 static void telnet_move_cursor(struct connection *connection, size_t pos)
380 {
381 struct telnet_connection *tc = connection->priv;
382 size_t tmp;
383
384 if (pos == tc->line_cursor) /* nothing to do */
385 return;
386
387 if (pos > tc->line_size) /* out of bounds */
388 return;
389
390 if (pos < tc->line_cursor) {
391 tmp = tc->line_cursor - pos;
392
393 for (size_t i = 0; i < tmp; i += 16)
394 telnet_write(connection, "\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b",
395 MIN(tmp - i, 16));
396 } else {
397 tmp = pos - tc->line_cursor;
398
399 for (size_t i = 0; i < tmp; i += 16)
400 telnet_write(connection, tc->line + tc->line_cursor + i,
401 MIN(tmp - i, 16));
402 }
403
404 tc->line_cursor = pos;
405 }
406
407 /* check buffer size leaving one spare character for string null termination */
408 static inline bool telnet_can_insert(struct connection *connection, size_t len)
409 {
410 struct telnet_connection *t_con = connection->priv;
411
412 return t_con->line_size + len < TELNET_LINE_MAX_SIZE;
413 }
414
415 /* write to telnet console, and update the telnet_connection members
416 * this function is capable of inserting in the middle of a line
417 * please ensure that data does not contain special characters (\n, \r, \t, \b ...)
418 *
419 * returns false when it fails to insert the requested data
420 */
421 static bool telnet_insert(struct connection *connection, const void *data, size_t len)
422 {
423 struct telnet_connection *t_con = connection->priv;
424
425 if (!telnet_can_insert(connection, len)) {
426 telnet_bell(connection);
427 return false;
428 }
429
430 if (t_con->line_cursor < t_con->line_size) {
431 /* we have some content after the cursor */
432 memmove(t_con->line + t_con->line_cursor + len,
433 t_con->line + t_con->line_cursor,
434 t_con->line_size - t_con->line_cursor);
435 }
436
437 strncpy(t_con->line + t_con->line_cursor, data, len);
438
439 telnet_write(connection,
440 t_con->line + t_con->line_cursor,
441 t_con->line_size + len - t_con->line_cursor);
442
443 t_con->line_size += len;
444 t_con->line_cursor += len;
445
446 for (size_t i = t_con->line_cursor; i < t_con->line_size; i++)
447 telnet_write(connection, "\b", 1);
448
449 return true;
450 }
451
452 static void telnet_delete_character(struct connection *connection)
453 {
454 struct telnet_connection *t_con = connection->priv;
455
456 if (t_con->line_cursor == 0)
457 return;
458
459 if (t_con->line_cursor != t_con->line_size) {
460 size_t i;
461 telnet_write(connection, "\b", 1);
462 t_con->line_cursor--;
463 t_con->line_size--;
464 memmove(t_con->line + t_con->line_cursor,
465 t_con->line + t_con->line_cursor + 1,
466 t_con->line_size -
467 t_con->line_cursor);
468
469 telnet_write(connection,
470 t_con->line + t_con->line_cursor,
471 t_con->line_size -
472 t_con->line_cursor);
473 telnet_write(connection, " \b", 2);
474 for (i = t_con->line_cursor; i < t_con->line_size; i++)
475 telnet_write(connection, "\b", 1);
476 } else {
477 t_con->line_size--;
478 t_con->line_cursor--;
479 /* back space: move the 'printer' head one char
480 * back, overwrite with space, move back again */
481 telnet_write(connection, "\b \b", 3);
482 }
483 }
484
485 static void telnet_remove_character(struct connection *connection)
486 {
487 struct telnet_connection *t_con = connection->priv;
488
489 if (t_con->line_cursor < t_con->line_size) {
490 size_t i;
491 t_con->line_size--;
492 /* remove char from line buffer */
493 memmove(t_con->line + t_con->line_cursor,
494 t_con->line + t_con->line_cursor + 1,
495 t_con->line_size - t_con->line_cursor);
496
497 /* print remainder of buffer */
498 telnet_write(connection, t_con->line + t_con->line_cursor,
499 t_con->line_size - t_con->line_cursor);
500 /* overwrite last char with whitespace */
501 telnet_write(connection, " \b", 2);
502
503 /* move back to cursor position*/
504 for (i = t_con->line_cursor; i < t_con->line_size; i++)
505 telnet_write(connection, "\b", 1);
506 }
507 }
508
509 static int telnet_exec_line(struct connection *connection)
510 {
511 struct telnet_connection *t_con = connection->priv;
512 struct command_context *command_context = connection->cmd_ctx;
513 int retval;
514
515 telnet_write(connection, "\r\n\x00", 3);
516
517 if (strcmp(t_con->line, "history") == 0) {
518 retval = telnet_history_print(connection);
519
520 if (retval != ERROR_OK)
521 return retval;
522
523 return ERROR_OK;
524 }
525
526 telnet_history_add(connection);
527
528 t_con->line_size = 0;
529
530 /* to suppress prompt in log callback during command execution */
531 t_con->prompt_visible = false;
532
533 if (strcmp(t_con->line, "shutdown") == 0)
534 telnet_save_history(t_con);
535
536 retval = command_run_line(command_context, t_con->line);
537
538 t_con->line_cursor = 0;
539 t_con->prompt_visible = true;
540
541 if (retval == ERROR_COMMAND_CLOSE_CONNECTION)
542 return ERROR_SERVER_REMOTE_CLOSED;
543
544 /* the prompt is always placed at the line beginning */
545 telnet_write(connection, "\r", 1);
546
547 retval = telnet_prompt(connection);
548 if (retval == ERROR_SERVER_REMOTE_CLOSED)
549 return ERROR_SERVER_REMOTE_CLOSED;
550
551 return ERROR_OK;
552 }
553
554 static void telnet_cut_line_to_end(struct connection *connection)
555 {
556 struct telnet_connection *t_con = connection->priv;
557
558 /* FIXME: currently this function does not save to clipboard */
559
560 if (t_con->line_cursor < t_con->line_size) {
561 /* overwrite with space, until end of line, move back */
562 for (size_t i = t_con->line_cursor; i < t_con->line_size; i++)
563 telnet_write(connection, " ", 1);
564 for (size_t i = t_con->line_cursor; i < t_con->line_size; i++)
565 telnet_write(connection, "\b", 1);
566 t_con->line[t_con->line_cursor] = '\0';
567 t_con->line_size = t_con->line_cursor;
568 }
569 }
570
571 static void telnet_interrupt(struct connection *connection)
572 {
573 struct telnet_connection *t_con = connection->priv;
574
575 /* print '^C' at line end, and display a new command prompt */
576 telnet_move_cursor(connection, t_con->line_size);
577 telnet_write(connection, "^C\n\r", 4);
578 t_con->line_cursor = 0;
579 t_con->line_size = 0;
580 telnet_prompt(connection);
581 }
582
583 static void telnet_auto_complete(struct connection *connection)
584 {
585 struct telnet_connection *t_con = connection->priv;
586 struct command_context *command_context = connection->cmd_ctx;
587
588 struct cmd_match {
589 char *cmd;
590 struct list_head lh;
591 };
592
593 LIST_HEAD(matches);
594
595 /* - user command sequence, either at line beginning
596 * or we start over after these characters ';', '[', '{'
597 * - user variable sequence, start after the character '$'
598 * and do not contain white spaces */
599 bool is_variable_auto_completion = false;
600 bool have_spaces = false;
601 size_t seq_start = (t_con->line_cursor == 0) ? 0 : (t_con->line_cursor - 1);
602 while (1) {
603 char c = t_con->line[seq_start];
604
605 if (c == ';' || c == '[' || c == '{') {
606 seq_start++;
607 break;
608 } else if (c == ' ') {
609 have_spaces = true;
610 } else if (c == '$' && !have_spaces) {
611 is_variable_auto_completion = true;
612 seq_start++;
613 break;
614 }
615
616 if (seq_start == 0)
617 break;
618
619 seq_start--;
620 }
621
622 /* user command position in the line, ignore leading spaces */
623 size_t usr_cmd_pos = seq_start;
624 while ((usr_cmd_pos < t_con->line_cursor) && isspace(t_con->line[usr_cmd_pos]))
625 usr_cmd_pos++;
626
627 /* user command length */
628 size_t usr_cmd_len = t_con->line_cursor - usr_cmd_pos;
629
630 /* optimize multiple spaces in the user command,
631 * because info commands does not tolerate multiple spaces */
632 size_t optimized_spaces = 0;
633 char query[usr_cmd_len + 1];
634 for (size_t i = 0; i < usr_cmd_len; i++) {
635 if ((i < usr_cmd_len - 1) && isspace(t_con->line[usr_cmd_pos + i])
636 && isspace(t_con->line[usr_cmd_pos + i + 1])) {
637 optimized_spaces++;
638 continue;
639 }
640
641 query[i - optimized_spaces] = t_con->line[usr_cmd_pos + i];
642 }
643
644 usr_cmd_len -= optimized_spaces;
645 query[usr_cmd_len] = '\0';
646
647 /* filter commands */
648 char *query_cmd;
649
650 if (is_variable_auto_completion)
651 query_cmd = alloc_printf("lsort [info vars {%s*}]", query);
652 else
653 query_cmd = alloc_printf("_telnet_autocomplete_helper {%s*}", query);
654
655 if (!query_cmd) {
656 LOG_ERROR("Out of memory");
657 return;
658 }
659
660 int retval = Jim_EvalSource(command_context->interp, __FILE__, __LINE__, query_cmd);
661 free(query_cmd);
662 if (retval != JIM_OK)
663 return;
664
665 Jim_Obj *list = Jim_GetResult(command_context->interp);
666 Jim_IncrRefCount(list);
667
668 /* common prefix length of the matched commands */
669 size_t common_len = 0;
670 char *first_match = NULL; /* used to compute the common prefix length */
671
672 int len = Jim_ListLength(command_context->interp, list);
673 for (int i = 0; i < len; i++) {
674 Jim_Obj *elem = Jim_ListGetIndex(command_context->interp, list, i);
675 Jim_IncrRefCount(elem);
676
677 char *name = (char *)Jim_GetString(elem, NULL);
678
679 /* validate the command */
680 bool ignore_cmd = false;
681 if (!is_variable_auto_completion) {
682 Jim_Cmd *jim_cmd = Jim_GetCommand(command_context->interp, elem, JIM_NONE);
683
684 if (!jim_cmd) {
685 /* Why we are here? Let's ignore it! */
686 ignore_cmd = true;
687 } else if (jimcmd_is_oocd_command(jim_cmd)) {
688 struct command *cmd = jimcmd_privdata(jim_cmd);
689
690 if (cmd && !cmd->handler && !cmd->jim_handler) {
691 /* Initial part of a multi-word command. Ignore it! */
692 ignore_cmd = true;
693 } else if (cmd && cmd->mode == COMMAND_CONFIG) {
694 /* Not executable after config phase. Ignore it! */
695 ignore_cmd = true;
696 }
697 }
698 }
699
700 /* save the command in the prediction list */
701 if (!ignore_cmd) {
702 struct cmd_match *match = calloc(1, sizeof(struct cmd_match));
703 if (!match) {
704 LOG_ERROR("Out of memory");
705 Jim_DecrRefCount(command_context->interp, elem);
706 break; /* break the for loop */
707 }
708
709 if (list_empty(&matches)) {
710 common_len = strlen(name);
711 first_match = name;
712 } else {
713 size_t new_common_len = usr_cmd_len; /* save some loops */
714
715 while (new_common_len < common_len && first_match[new_common_len] == name[new_common_len])
716 new_common_len++;
717
718 common_len = new_common_len;
719 }
720
721 match->cmd = name;
722 list_add_tail(&match->lh, &matches);
723 }
724
725 Jim_DecrRefCount(command_context->interp, elem);
726 }
727 /* end of command filtering */
728
729 /* proceed with auto-completion */
730 if (list_empty(&matches))
731 telnet_bell(connection);
732 else if (common_len == usr_cmd_len && list_is_singular(&matches) && t_con->line_cursor == t_con->line_size)
733 telnet_insert(connection, " ", 1);
734 else if (common_len > usr_cmd_len) {
735 int completion_size = common_len - usr_cmd_len;
736 if (telnet_insert(connection, first_match + usr_cmd_len, completion_size)) {
737 /* in bash this extra space is only added when the cursor in at the end of line */
738 if (list_is_singular(&matches) && t_con->line_cursor == t_con->line_size)
739 telnet_insert(connection, " ", 1);
740 }
741 } else if (!list_is_singular(&matches)) {
742 telnet_write(connection, "\n\r", 2);
743
744 struct cmd_match *match;
745 list_for_each_entry(match, &matches, lh) {
746 telnet_write(connection, match->cmd, strlen(match->cmd));
747 telnet_write(connection, "\n\r", 2);
748 }
749
750 telnet_prompt(connection);
751 telnet_write(connection, t_con->line, t_con->line_size);
752
753 /* restore the terminal visible cursor location */
754 for (size_t i = t_con->line_cursor; i < t_con->line_size; i++)
755 telnet_write(connection, "\b", 1);
756 }
757
758 /* destroy the command_list */
759 struct cmd_match *tmp, *match;
760 list_for_each_entry_safe(match, tmp, &matches, lh)
761 free(match);
762
763 Jim_DecrRefCount(command_context->interp, list);
764 }
765
766 static int telnet_input(struct connection *connection)
767 {
768 int bytes_read;
769 unsigned char buffer[TELNET_BUFFER_SIZE];
770 unsigned char *buf_p;
771 struct telnet_connection *t_con = connection->priv;
772
773 bytes_read = connection_read(connection, buffer, TELNET_BUFFER_SIZE);
774
775 if (bytes_read == 0)
776 return ERROR_SERVER_REMOTE_CLOSED;
777 else if (bytes_read == -1) {
778 LOG_ERROR("error during read: %s", strerror(errno));
779 return ERROR_SERVER_REMOTE_CLOSED;
780 }
781
782 buf_p = buffer;
783 while (bytes_read) {
784 switch (t_con->state) {
785 case TELNET_STATE_DATA:
786 if (*buf_p == 0xff) {
787 t_con->state = TELNET_STATE_IAC;
788 } else {
789 if (isprint(*buf_p)) { /* printable character */
790 telnet_insert(connection, buf_p, 1);
791 } else { /* non-printable */
792 if (*buf_p == 0x1b) { /* escape */
793 t_con->state = TELNET_STATE_ESCAPE;
794 t_con->last_escape = '\x00';
795 } else if ((*buf_p == 0xd) || (*buf_p == 0xa)) { /* CR/LF */
796 int retval;
797
798 /* skip over combinations with CR/LF and NUL characters */
799 if ((bytes_read > 1) && ((*(buf_p + 1) == 0xa) ||
800 (*(buf_p + 1) == 0xd))) {
801 buf_p++;
802 bytes_read--;
803 }
804 if ((bytes_read > 1) && (*(buf_p + 1) == 0)) {
805 buf_p++;
806 bytes_read--;
807 }
808 t_con->line[t_con->line_size] = 0;
809
810 retval = telnet_exec_line(connection);
811 if (retval != ERROR_OK)
812 return retval;
813 } else if ((*buf_p == 0x7f) || (*buf_p == 0x8)) { /* delete character */
814 telnet_delete_character(connection);
815 } else if (*buf_p == 0x15) { /* clear line */
816 telnet_clear_line(connection, t_con);
817 } else if (*buf_p == CTRL('B')) { /* cursor left */
818 telnet_move_cursor(connection, t_con->line_cursor - 1);
819 t_con->state = TELNET_STATE_DATA;
820 } else if (*buf_p == CTRL('C')) { /* interrupt */
821 telnet_interrupt(connection);
822 } else if (*buf_p == CTRL('F')) { /* cursor right */
823 telnet_move_cursor(connection, t_con->line_cursor + 1);
824 t_con->state = TELNET_STATE_DATA;
825 } else if (*buf_p == CTRL('P')) { /* cursor up */
826 telnet_history_up(connection);
827 } else if (*buf_p == CTRL('N')) { /* cursor down */
828 telnet_history_down(connection);
829 } else if (*buf_p == CTRL('A')) { /* move the cursor to the beginning of the line */
830 telnet_move_cursor(connection, 0);
831 } else if (*buf_p == CTRL('E')) { /* move the cursor to the end of the line */
832 telnet_move_cursor(connection, t_con->line_size);
833 } else if (*buf_p == CTRL('K')) { /* kill line to end */
834 telnet_cut_line_to_end(connection);
835 } else if (*buf_p == '\t') {
836 telnet_auto_complete(connection);
837 } else {
838 LOG_DEBUG("unhandled nonprintable: %2.2x", *buf_p);
839 }
840 }
841 }
842 break;
843 case TELNET_STATE_IAC:
844 switch (*buf_p) {
845 case 0xfe:
846 t_con->state = TELNET_STATE_DONT;
847 break;
848 case 0xfd:
849 t_con->state = TELNET_STATE_DO;
850 break;
851 case 0xfc:
852 t_con->state = TELNET_STATE_WONT;
853 break;
854 case 0xfb:
855 t_con->state = TELNET_STATE_WILL;
856 break;
857 }
858 break;
859 case TELNET_STATE_SB:
860 break;
861 case TELNET_STATE_SE:
862 break;
863 case TELNET_STATE_WILL:
864 case TELNET_STATE_WONT:
865 case TELNET_STATE_DO:
866 case TELNET_STATE_DONT:
867 t_con->state = TELNET_STATE_DATA;
868 break;
869 case TELNET_STATE_ESCAPE:
870 if (t_con->last_escape == '[') {
871 if (*buf_p == 'D') { /* cursor left */
872 telnet_move_cursor(connection, t_con->line_cursor - 1);
873 t_con->state = TELNET_STATE_DATA;
874 } else if (*buf_p == 'C') { /* cursor right */
875 telnet_move_cursor(connection, t_con->line_cursor + 1);
876 t_con->state = TELNET_STATE_DATA;
877 } else if (*buf_p == 'A') { /* cursor up */
878 telnet_history_up(connection);
879 } else if (*buf_p == 'B') { /* cursor down */
880 telnet_history_down(connection);
881 } else if (*buf_p == 'F') { /* end key */
882 telnet_move_cursor(connection, t_con->line_size);
883 t_con->state = TELNET_STATE_DATA;
884 } else if (*buf_p == 'H') { /* home key */
885 telnet_move_cursor(connection, 0);
886 t_con->state = TELNET_STATE_DATA;
887 } else if (*buf_p == '3') {
888 t_con->last_escape = *buf_p;
889 } else {
890 t_con->state = TELNET_STATE_DATA;
891 }
892 } else if (t_con->last_escape == '3') {
893 /* Remove character */
894 if (*buf_p == '~') {
895 telnet_remove_character(connection);
896 t_con->state = TELNET_STATE_DATA;
897 } else
898 t_con->state = TELNET_STATE_DATA;
899 } else if (t_con->last_escape == '\x00') {
900 if (*buf_p == '[')
901 t_con->last_escape = *buf_p;
902 else
903 t_con->state = TELNET_STATE_DATA;
904 } else {
905 LOG_ERROR("BUG: unexpected value in t_con->last_escape");
906 t_con->state = TELNET_STATE_DATA;
907 }
908
909 break;
910 default:
911 LOG_ERROR("unknown telnet state");
912 return ERROR_FAIL;
913 }
914
915 bytes_read--;
916 buf_p++;
917 }
918
919 return ERROR_OK;
920 }
921
922 static int telnet_connection_closed(struct connection *connection)
923 {
924 struct telnet_connection *t_con = connection->priv;
925 int i;
926
927 log_remove_callback(telnet_log_callback, connection);
928
929 free(t_con->prompt);
930 t_con->prompt = NULL;
931
932 /* save telnet history */
933 telnet_save_history(t_con);
934
935 for (i = 0; i < TELNET_LINE_HISTORY_SIZE; i++) {
936 free(t_con->history[i]);
937 t_con->history[i] = NULL;
938 }
939
940 /* if this connection registered a debug-message receiver delete it */
941 delete_debug_msg_receiver(connection->cmd_ctx, NULL);
942
943 free(connection->priv);
944 connection->priv = NULL;
945
946 return ERROR_OK;
947 }
948
949 static const struct service_driver telnet_service_driver = {
950 .name = "telnet",
951 .new_connection_during_keep_alive_handler = NULL,
952 .new_connection_handler = telnet_new_connection,
953 .input_handler = telnet_input,
954 .connection_closed_handler = telnet_connection_closed,
955 .keep_client_alive_handler = NULL,
956 };
957
958 int telnet_init(char *banner)
959 {
960 if (strcmp(telnet_port, "disabled") == 0) {
961 LOG_INFO("telnet server disabled");
962 return ERROR_OK;
963 }
964
965 struct telnet_service *telnet_service =
966 malloc(sizeof(struct telnet_service));
967
968 if (!telnet_service) {
969 LOG_ERROR("Failed to allocate telnet service.");
970 return ERROR_FAIL;
971 }
972
973 telnet_service->banner = banner;
974
975 int ret = add_service(&telnet_service_driver, telnet_port, CONNECTION_LIMIT_UNLIMITED,
976 telnet_service);
977
978 if (ret != ERROR_OK) {
979 free(telnet_service);
980 return ret;
981 }
982
983 return ERROR_OK;
984 }
985
986 /* daemon configuration command telnet_port */
987 COMMAND_HANDLER(handle_telnet_port_command)
988 {
989 return CALL_COMMAND_HANDLER(server_pipe_command, &telnet_port);
990 }
991
992 COMMAND_HANDLER(handle_exit_command)
993 {
994 return ERROR_COMMAND_CLOSE_CONNECTION;
995 }
996
997 static const struct command_registration telnet_command_handlers[] = {
998 {
999 .name = "exit",
1000 .handler = handle_exit_command,
1001 .mode = COMMAND_EXEC,
1002 .usage = "",
1003 .help = "exit telnet session",
1004 },
1005 {
1006 .name = "telnet_port",
1007 .handler = handle_telnet_port_command,
1008 .mode = COMMAND_CONFIG,
1009 .help = "Specify port on which to listen "
1010 "for incoming telnet connections. "
1011 "Read help on 'gdb_port'.",
1012 .usage = "[port_num]",
1013 },
1014 COMMAND_REGISTRATION_DONE
1015 };
1016
1017 int telnet_register_commands(struct command_context *cmd_ctx)
1018 {
1019 telnet_port = strdup("4444");
1020 return register_commands(cmd_ctx, NULL, telnet_command_handlers);
1021 }
1022
1023 void telnet_service_free(void)
1024 {
1025 free(telnet_port);
1026 }

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