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- fix issue with telnet prompt while gdb running
[openocd.git] / src / server / telnet_server.c
blob4d91902e96553e7f565b0f031859ad86101aa045
1 /***************************************************************************
2 * Copyright (C) 2005 by Dominic Rath *
3 * Dominic.Rath@gmx.de *
4 * *
5 * This program is free software; you can redistribute it and/or modify *
6 * it under the terms of the GNU General Public License as published by *
7 * the Free Software Foundation; either version 2 of the License, or *
8 * (at your option) any later version. *
9 * *
10 * This program is distributed in the hope that it will be useful, *
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of *
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
13 * GNU General Public License for more details. *
14 * *
15 * You should have received a copy of the GNU General Public License *
16 * along with this program; if not, write to the *
17 * Free Software Foundation, Inc., *
18 * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. *
19 ***************************************************************************/
20 #ifdef HAVE_CONFIG_H
21 #include "config.h"
22 #endif
23
24 #include "replacements.h"
25
26 #include "telnet_server.h"
27
28 #include "server.h"
29 #include "log.h"
30 #include "command.h"
31 #include "target.h"
32 #include "target_request.h"
33
34 #include <stdlib.h>
35 #include <unistd.h>
36 #include <errno.h>
37 #include <string.h>
38 #include <ctype.h>
39
40 static unsigned short telnet_port = 0;
41
42 int handle_exit_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc);
43 int handle_telnet_port_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc);
44
45 static char *negotiate =
46 "\xFF\xFB\x03" /* IAC WILL Suppress Go Ahead */
47 "\xFF\xFB\x01" /* IAC WILL Echo */
48 "\xFF\xFD\x03" /* IAC DO Suppress Go Ahead */
49 "\xFF\xFE\x01"; /* IAC DON'T Echo */
50
51 #define CTRL(c) (c - '@')
52
53 void telnet_prompt(connection_t *connection)
54 {
55 telnet_connection_t *t_con = connection->priv;
56
57 write_socket(connection->fd, t_con->prompt, strlen(t_con->prompt));
58 }
59
60 int telnet_outputline(connection_t *connection, char* line)
61 {
62 write_socket(connection->fd, line, strlen(line));
63 return write_socket(connection->fd, "\r\n\0", 3);
64 }
65
66 int telnet_output(struct command_context_s *cmd_ctx, char* line)
67 {
68 connection_t *connection = cmd_ctx->output_handler_priv;
69
70 write_socket(connection->fd, line, strlen(line));
71 write_socket(connection->fd, "\r\n\0", 3);
72
73 return ERROR_OK;
74 }
75
76 void telnet_log_callback(void *privData, const char *file, int line,
77 const char *function, const char *format, va_list args)
78 {
79 connection_t *connection = (connection_t *)privData;
80 char *t = allocPrintf(format, args);
81 if (t == NULL)
82 return;
83
84 telnet_outputline(connection, t);
85
86 free(t);
87 }
88
89 int telnet_target_callback_event_handler(struct target_s *target, enum target_event event, void *priv)
90 {
91 struct command_context_s *cmd_ctx = priv;
92 connection_t *connection = cmd_ctx->output_handler_priv;
93 telnet_connection_t *t_con = connection->priv;
94 char buffer[512];
95
96 switch (event)
97 {
98 case TARGET_EVENT_HALTED:
99 command_print(cmd_ctx, "Target %i halted", get_num_by_target(target));
100 target->type->arch_state(target, buffer, 512);
101 buffer[511] = 0;
102 command_print(cmd_ctx, "%s", buffer);
103 if (!t_con->suppress_prompt)
104 telnet_prompt(connection);
105 break;
106 case TARGET_EVENT_RESUMED:
107 command_print(cmd_ctx, "Target %i resumed", get_num_by_target(target));
108 if (!t_con->suppress_prompt)
109 telnet_prompt(connection);
110 break;
111 default:
112 break;
113 }
114
115 return ERROR_OK;
116 }
117
118 int telnet_new_connection(connection_t *connection)
119 {
120 telnet_connection_t *telnet_connection = malloc(sizeof(telnet_connection_t));
121 telnet_service_t *telnet_service = connection->service->priv;
122 int i;
123
124 connection->priv = telnet_connection;
125
126 /* initialize telnet connection information */
127 telnet_connection->line_size = 0;
128 telnet_connection->line_cursor = 0;
129 telnet_connection->option_size = 0;
130 telnet_connection->prompt = strdup("> ");
131 telnet_connection->suppress_prompt = 0;
132 telnet_connection->state = TELNET_STATE_DATA;
133
134 /* output goes through telnet connection */
135 command_set_output_handler(connection->cmd_ctx, telnet_output, connection);
136
137 /* negotiate telnet options */
138 write_socket(connection->fd, negotiate, strlen(negotiate));
139
140 /* print connection banner */
141 if (telnet_service->banner)
142 {
143 write_socket(connection->fd, telnet_service->banner, strlen(telnet_service->banner));
144 write_socket(connection->fd, "\r\n\0", 3);
145 }
146
147 telnet_prompt(connection);
148
149 /* initialize history */
150 for (i = 0; i < TELNET_LINE_HISTORY_SIZE; i++)
151 {
152 telnet_connection->history[i] = NULL;
153 }
154 telnet_connection->next_history = 0;
155 telnet_connection->current_history = 0;
156
157 target_register_event_callback(telnet_target_callback_event_handler, connection->cmd_ctx);
158
159 return ERROR_OK;
160 }
161
162 void telnet_clear_line(connection_t *connection, telnet_connection_t *t_con)
163 {
164 /* move to end of line */
165 if (t_con->line_cursor < t_con->line_size)
166 {
167 write_socket(connection->fd, t_con->line + t_con->line_cursor, t_con->line_size - t_con->line_cursor);
168 }
169
170 /* backspace, overwrite with space, backspace */
171 while (t_con->line_size > 0)
172 {
173 write_socket(connection->fd, "\b \b", 3);
174 t_con->line_size--;
175 }
176 t_con->line_cursor = 0;
177 }
178
179 int telnet_input(connection_t *connection)
180 {
181 int bytes_read;
182 char buffer[TELNET_BUFFER_SIZE];
183 char *buf_p;
184 telnet_connection_t *t_con = connection->priv;
185 command_context_t *command_context = connection->cmd_ctx;
186
187 bytes_read = read_socket(connection->fd, buffer, TELNET_BUFFER_SIZE);
188
189 if (bytes_read == 0)
190 return ERROR_SERVER_REMOTE_CLOSED;
191 else if (bytes_read == -1)
192 {
193 ERROR("error during read: %s", strerror(errno));
194 return ERROR_SERVER_REMOTE_CLOSED;
195 }
196
197 buf_p = buffer;
198 while (bytes_read)
199 {
200 switch (t_con->state)
201 {
202 case TELNET_STATE_DATA:
203 if (*buf_p == '\xff')
204 {
205 t_con->state = TELNET_STATE_IAC;
206 }
207 else
208 {
209 if (isprint(*buf_p)) /* printable character */
210 {
211 write_socket(connection->fd, buf_p, 1);
212 if (t_con->line_cursor == t_con->line_size)
213 {
214 t_con->line[t_con->line_size++] = *buf_p;
215 t_con->line_cursor++;
216 }
217 else
218 {
219 int i;
220 memmove(t_con->line + t_con->line_cursor + 1, t_con->line + t_con->line_cursor, t_con->line_size - t_con->line_cursor);
221 t_con->line[t_con->line_cursor++] = *buf_p;
222 t_con->line_size++;
223 write_socket(connection->fd, t_con->line + t_con->line_cursor, t_con->line_size - t_con->line_cursor);
224 for (i = t_con->line_cursor; i < t_con->line_size; i++)
225 {
226 write_socket(connection->fd, "\b", 1);
227 }
228 }
229 }
230 else /* non-printable */
231 {
232 if (*buf_p == 0x1b) /* escape */
233 {
234 t_con->state = TELNET_STATE_ESCAPE;
235 t_con->last_escape = '\x00';
236 }
237 else if ((*buf_p == 0xd) || (*buf_p == 0xa)) /* CR/LF */
238 {
239 int retval;
240
241 /* skip over combinations with CR/LF + NUL */
242 if (((*(buf_p + 1) == 0xa) || (*(buf_p + 1) == 0xd)) && (bytes_read > 1))
243 {
244 buf_p++;
245 bytes_read--;
246 }
247 if ((*(buf_p + 1) == 0) && (bytes_read > 1))
248 {
249 buf_p++;
250 bytes_read--;
251 }
252 t_con->line[t_con->line_size] = 0;
253
254 write_socket(connection->fd, "\r\n\x00", 3);
255
256 if (strcmp(t_con->line, "history") == 0)
257 {
258 int i;
259 for (i = 0; i < TELNET_LINE_HISTORY_SIZE; i++)
260 {
261 if (t_con->history[i])
262 {
263 write_socket(connection->fd, t_con->history[i], strlen(t_con->history[i]));
264 write_socket(connection->fd, "\r\n\x00", 3);
265 }
266 }
267 telnet_prompt(connection);
268 t_con->line_size = 0;
269 t_con->line_cursor = 0;
270 continue;
271 }
272
273 log_setCallback(telnet_log_callback, connection);
274 t_con->suppress_prompt = 1;
275
276 if ((retval = command_run_line(command_context, t_con->line)) != ERROR_OK)
277 {
278 if (retval == ERROR_COMMAND_CLOSE_CONNECTION)
279 {
280 return ERROR_SERVER_REMOTE_CLOSED;
281 }
282 }
283
284 t_con->suppress_prompt = 0;
285
286 /* Save only non-blank lines in the history */
287 if (t_con->line_size > 0)
288 {
289 /* if the history slot is already taken, free it */
290 if (t_con->history[t_con->next_history])
291 {
292 free(t_con->history[t_con->next_history]);
293 }
294
295 /* add line to history */
296 t_con->history[t_con->next_history] = strdup(t_con->line);
297
298 /* wrap history at TELNET_LINE_HISTORY_SIZE */
299 t_con->next_history = (t_con->next_history + 1) % TELNET_LINE_HISTORY_SIZE;
300
301 /* current history line starts at the new entry */
302 t_con->current_history = t_con->next_history;
303
304 if (t_con->history[t_con->current_history])
305 {
306 free(t_con->history[t_con->current_history]);
307 }
308 t_con->history[t_con->current_history] = strdup("");
309 }
310
311 /* output prompt after command */
312 telnet_prompt(connection);
313
314 t_con->line_size = 0;
315 t_con->line_cursor = 0;
316 }
317 else if ((*buf_p == 0x7f) || (*buf_p == 0x8)) /* delete character */
318 {
319 if (t_con->line_cursor > 0)
320 {
321 if (t_con->line_cursor != t_con->line_size)
322 {
323 int i;
324 write_socket(connection->fd, "\b", 1);
325 t_con->line_cursor--;
326 t_con->line_size--;
327 memmove(t_con->line + t_con->line_cursor, t_con->line + t_con->line_cursor + 1, t_con->line_size - t_con->line_cursor);
328
329 write_socket(connection->fd, t_con->line + t_con->line_cursor, t_con->line_size - t_con->line_cursor);
330 write_socket(connection->fd, " \b", 2);
331 for (i = t_con->line_cursor; i < t_con->line_size; i++)
332 {
333 write_socket(connection->fd, "\b", 1);
334 }
335 }
336 else
337 {
338 t_con->line_size--;
339 t_con->line_cursor--;
340 /* back space: move the 'printer' head one char back, overwrite with space, move back again */
341 write_socket(connection->fd, "\b \b", 3);
342 }
343 }
344 }
345 else if (*buf_p == 0x15) /* clear line */
346 {
347 telnet_clear_line(connection, t_con);
348 }
349 else if (*buf_p == CTRL('B')) /* cursor left */
350 {
351 if (t_con->line_cursor > 0)
352 {
353 write_socket(connection->fd, "\b", 1);
354 t_con->line_cursor--;
355 }
356 t_con->state = TELNET_STATE_DATA;
357 }
358 else if (*buf_p == CTRL('F')) /* cursor right */
359 {
360 if (t_con->line_cursor < t_con->line_size)
361 {
362 write_socket(connection->fd, t_con->line + t_con->line_cursor++, 1);
363 }
364 t_con->state = TELNET_STATE_DATA;
365 }
366 else
367 {
368 DEBUG("unhandled nonprintable: %2.2x", *buf_p);
369 }
370 }
371 }
372 break;
373 case TELNET_STATE_IAC:
374 switch (*buf_p)
375 {
376 case '\xfe':
377 t_con->state = TELNET_STATE_DONT;
378 break;
379 case '\xfd':
380 t_con->state = TELNET_STATE_DO;
381 break;
382 case '\xfc':
383 t_con->state = TELNET_STATE_WONT;
384 break;
385 case '\xfb':
386 t_con->state = TELNET_STATE_WILL;
387 break;
388 }
389 break;
390 case TELNET_STATE_SB:
391 break;
392 case TELNET_STATE_SE:
393 break;
394 case TELNET_STATE_WILL:
395 case TELNET_STATE_WONT:
396 case TELNET_STATE_DO:
397 case TELNET_STATE_DONT:
398 t_con->state = TELNET_STATE_DATA;
399 break;
400 case TELNET_STATE_ESCAPE:
401 if (t_con->last_escape == '[')
402 {
403 if (*buf_p == 'D') /* cursor left */
404 {
405 if (t_con->line_cursor > 0)
406 {
407 write_socket(connection->fd, "\b", 1);
408 t_con->line_cursor--;
409 }
410 t_con->state = TELNET_STATE_DATA;
411 }
412 else if (*buf_p == 'C') /* cursor right */
413 {
414 if (t_con->line_cursor < t_con->line_size)
415 {
416 write_socket(connection->fd, t_con->line + t_con->line_cursor++, 1);
417 }
418 t_con->state = TELNET_STATE_DATA;
419 }
420 else if (*buf_p == 'A') /* cursor up */
421 {
422 int last_history = (t_con->current_history > 0) ? t_con->current_history - 1 : TELNET_LINE_HISTORY_SIZE-1;
423 if (t_con->history[last_history])
424 {
425 telnet_clear_line(connection, t_con);
426 t_con->line_size = strlen(t_con->history[last_history]);
427 t_con->line_cursor = t_con->line_size;
428 memcpy(t_con->line, t_con->history[last_history], t_con->line_size + 1);
429 write_socket(connection->fd, t_con->line, t_con->line_size);
430 t_con->current_history = last_history;
431 }
432 t_con->state = TELNET_STATE_DATA;
433 }
434 else if (*buf_p == 'B') /* cursor down */
435 {
436 int next_history = (t_con->current_history + 1) % TELNET_LINE_HISTORY_SIZE;
437 if (t_con->history[next_history])
438 {
439 telnet_clear_line(connection, t_con);
440 t_con->line_size = strlen(t_con->history[next_history]);
441 t_con->line_cursor = t_con->line_size;
442 memcpy(t_con->line, t_con->history[next_history], t_con->line_size + 1);
443 write_socket(connection->fd, t_con->line, t_con->line_size);
444 t_con->current_history = next_history;
445 }
446 t_con->state = TELNET_STATE_DATA;
447 }
448 else if (*buf_p == '3')
449 {
450 t_con->last_escape = *buf_p;
451 }
452 else
453 {
454 t_con->state = TELNET_STATE_DATA;
455 }
456 }
457 else if (t_con->last_escape == '3')
458 {
459 /* Remove character */
460 if (*buf_p == '~')
461 {
462 if (t_con->line_cursor < t_con->line_size)
463 {
464 int i;
465 t_con->line_size--;
466 /* remove char from line buffer */
467 memmove(t_con->line + t_con->line_cursor, t_con->line + t_con->line_cursor + 1, t_con->line_size - t_con->line_cursor);
468
469 /* print remainder of buffer */
470 write_socket(connection->fd, t_con->line + t_con->line_cursor, t_con->line_size - t_con->line_cursor);
471 /* overwrite last char with whitespace */
472 write_socket(connection->fd, " \b", 2);
473
474 /* move back to cursor position*/
475 for (i = t_con->line_cursor; i < t_con->line_size; i++)
476 {
477 write_socket(connection->fd, "\b", 1);
478 }
479 }
480
481 t_con->state = TELNET_STATE_DATA;
482 }
483 else
484 {
485 t_con->state = TELNET_STATE_DATA;
486 }
487 }
488 else if (t_con->last_escape == '\x00')
489 {
490 if (*buf_p == '[')
491 {
492 t_con->last_escape = *buf_p;
493 }
494 else
495 {
496 t_con->state = TELNET_STATE_DATA;
497 }
498 }
499 else
500 {
501 ERROR("BUG: unexpected value in t_con->last_escape");
502 t_con->state = TELNET_STATE_DATA;
503 }
504
505 break;
506 default:
507 ERROR("unknown telnet state");
508 exit(-1);
509 }
510
511 bytes_read--;
512 buf_p++;
513 }
514
515 return ERROR_OK;
516 }
517
518 int telnet_connection_closed(connection_t *connection)
519 {
520 telnet_connection_t *t_con = connection->priv;
521 int i;
522
523 if (t_con->prompt)
524 {
525 free(t_con->prompt);
526 t_con->prompt = NULL;
527 }
528
529 for (i = 0; i < TELNET_LINE_HISTORY_SIZE; i++)
530 {
531 if (t_con->history[i])
532 {
533 free(t_con->history[i]);
534 t_con->history[i] = NULL;
535 }
536 }
537
538 /* if this connection registered a debug-message receiver delete it */
539 delete_debug_msg_receiver(connection->cmd_ctx, NULL);
540
541 if (connection->priv)
542 {
543 free(connection->priv);
544 connection->priv = NULL;
545 }
546 else
547 {
548 ERROR("BUG: connection->priv == NULL");
549 }
550
551 target_unregister_event_callback(telnet_target_callback_event_handler, connection->cmd_ctx);
552
553 return ERROR_OK;
554 }
555
556 int telnet_set_prompt(connection_t *connection, char *prompt)
557 {
558 telnet_connection_t *t_con = connection->priv;
559
560 t_con->prompt = strdup(prompt);
561
562 return ERROR_OK;
563 }
564
565 int telnet_init(char *banner)
566 {
567 telnet_service_t *telnet_service = malloc(sizeof(telnet_service_t));
568
569 if (telnet_port == 0)
570 {
571 WARNING("no telnet port specified, using default port 4444");
572 telnet_port = 4444;
573 }
574
575 telnet_service->banner = banner;
576
577 add_service("telnet", CONNECTION_TELNET, telnet_port, 1, telnet_new_connection, telnet_input, telnet_connection_closed, telnet_service);
578
579 return ERROR_OK;
580 }
581
582 int telnet_register_commands(command_context_t *command_context)
583 {
584 register_command(command_context, NULL, "exit", handle_exit_command,
585 COMMAND_EXEC, "exit telnet session");
586
587 register_command(command_context, NULL, "telnet_port", handle_telnet_port_command,
588 COMMAND_CONFIG, "");
589
590 return ERROR_OK;
591 }
592
593 /* daemon configuration command telnet_port */
594 int handle_telnet_port_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc)
595 {
596 if (argc == 0)
597 return ERROR_OK;
598
599 /* only if the port wasn't overwritten by cmdline */
600 if (telnet_port == 0)
601 telnet_port = strtoul(args[0], NULL, 0);
602
603 return ERROR_OK;
604 }
605
606 int handle_exit_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc)
607 {
608 return ERROR_COMMAND_CLOSE_CONNECTION;
609 }
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