1 /***************************************************************************
2 * Copyright (C) 2005 by Dominic Rath *
3 * Dominic.Rath@gmx.de *
5 * Copyright (C) 2007-2010 Øyvind Harboe *
6 * oyvind.harboe@zylin.com *
8 * Copyright (C) 2008 by Spencer Oliver *
9 * spen@spen-soft.co.uk *
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. *
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. *
21 * You should have received a copy of the GNU General Public License *
22 * along with this program; if not, write to the *
23 * Free Software Foundation, Inc., *
24 * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. *
25 ***************************************************************************/
31 #include "telnet_server.h"
32 #include <target/target_request.h>
33 #include <helper/configuration.h>
35 static const char *telnet_port
;
37 static char *negotiate
=
38 "\xFF\xFB\x03" /* IAC WILL Suppress Go Ahead */
39 "\xFF\xFB\x01" /* IAC WILL Echo */
40 "\xFF\xFD\x03" /* IAC DO Suppress Go Ahead */
41 "\xFF\xFE\x01"; /* IAC DON'T Echo */
43 #define CTRL(c) (c - '@')
44 #define TELNET_HISTORY ".openocd_history"
46 /* The only way we can detect that the socket is closed is the first time
47 * we write to it, we will fail. Subsequent write operations will
50 static int telnet_write(struct connection
*connection
, const void *data
,
53 struct telnet_connection
*t_con
= connection
->priv
;
55 return ERROR_SERVER_REMOTE_CLOSED
;
57 if (connection_write(connection
, data
, len
) == len
)
60 return ERROR_SERVER_REMOTE_CLOSED
;
63 static int telnet_prompt(struct connection
*connection
)
65 struct telnet_connection
*t_con
= connection
->priv
;
67 return telnet_write(connection
, t_con
->prompt
, strlen(t_con
->prompt
));
70 static int telnet_outputline(struct connection
*connection
, const char *line
)
74 /* process lines in buffer */
76 char *line_end
= strchr(line
, '\n');
83 telnet_write(connection
, line
, len
);
85 telnet_write(connection
, "\r\n", 2);
94 static int telnet_output(struct command_context
*cmd_ctx
, const char *line
)
96 struct connection
*connection
= cmd_ctx
->output_handler_priv
;
98 return telnet_outputline(connection
, line
);
101 static void telnet_log_callback(void *priv
, const char *file
, unsigned line
,
102 const char *function
, const char *string
)
104 struct connection
*connection
= priv
;
105 struct telnet_connection
*t_con
= connection
->priv
;
108 /* if there is no prompt, simply output the message */
109 if (t_con
->line_cursor
< 0) {
110 telnet_outputline(connection
, string
);
114 /* clear the command line */
115 for (i
= strlen(t_con
->prompt
) + t_con
->line_size
; i
> 0; i
-= 16)
116 telnet_write(connection
, "\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b", i
> 16 ? 16 : i
);
117 for (i
= strlen(t_con
->prompt
) + t_con
->line_size
; i
> 0; i
-= 16)
118 telnet_write(connection
, " ", i
> 16 ? 16 : i
);
119 for (i
= strlen(t_con
->prompt
) + t_con
->line_size
; i
> 0; i
-= 16)
120 telnet_write(connection
, "\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b", i
> 16 ? 16 : i
);
122 /* output the message */
123 telnet_outputline(connection
, string
);
125 /* put the command line to its previous state */
126 telnet_prompt(connection
);
127 telnet_write(connection
, t_con
->line
, t_con
->line_size
);
128 for (i
= t_con
->line_size
; i
> t_con
->line_cursor
; i
--)
129 telnet_write(connection
, "\b", 1);
132 static void telnet_load_history(struct telnet_connection
*t_con
)
135 char buffer
[TELNET_BUFFER_SIZE
];
138 char *history
= get_home_dir(TELNET_HISTORY
);
140 if (history
== NULL
) {
141 LOG_INFO("unable to get user home directory, telnet history will be disabled");
145 histfp
= fopen(history
, "rb");
149 while (fgets(buffer
, sizeof(buffer
), histfp
) != NULL
) {
151 char *p
= strchr(buffer
, '\n');
154 if (buffer
[0] && i
< TELNET_LINE_HISTORY_SIZE
)
155 t_con
->history
[i
++] = strdup(buffer
);
158 t_con
->next_history
= i
;
159 t_con
->next_history
%= TELNET_LINE_HISTORY_SIZE
;
160 /* try to set to last entry - 1, that way we skip over any exit/shutdown cmds */
161 t_con
->current_history
= t_con
->next_history
> 0 ? i
- 1 : 0;
168 static void telnet_save_history(struct telnet_connection
*t_con
)
174 char *history
= get_home_dir(TELNET_HISTORY
);
176 if (history
== NULL
) {
177 LOG_INFO("unable to get user home directory, telnet history will be disabled");
181 histfp
= fopen(history
, "wb");
185 num
= TELNET_LINE_HISTORY_SIZE
;
186 i
= t_con
->current_history
+ 1;
187 i
%= TELNET_LINE_HISTORY_SIZE
;
189 while (t_con
->history
[i
] == NULL
&& num
> 0) {
191 i
%= TELNET_LINE_HISTORY_SIZE
;
196 for (; num
> 0; num
--) {
197 fprintf(histfp
, "%s\n", t_con
->history
[i
]);
199 i
%= TELNET_LINE_HISTORY_SIZE
;
208 static int telnet_new_connection(struct connection
*connection
)
210 struct telnet_connection
*telnet_connection
= malloc(sizeof(struct telnet_connection
));
211 struct telnet_service
*telnet_service
= connection
->service
->priv
;
214 connection
->priv
= telnet_connection
;
216 /* initialize telnet connection information */
217 telnet_connection
->closed
= 0;
218 telnet_connection
->line_size
= 0;
219 telnet_connection
->line_cursor
= 0;
220 telnet_connection
->option_size
= 0;
221 telnet_connection
->prompt
= strdup("> ");
222 telnet_connection
->state
= TELNET_STATE_DATA
;
224 /* output goes through telnet connection */
225 command_set_output_handler(connection
->cmd_ctx
, telnet_output
, connection
);
227 /* negotiate telnet options */
228 telnet_write(connection
, negotiate
, strlen(negotiate
));
230 /* print connection banner */
231 if (telnet_service
->banner
) {
232 telnet_write(connection
, telnet_service
->banner
, strlen(telnet_service
->banner
));
233 telnet_write(connection
, "\r\n", 2);
236 /* the prompt is always placed at the line beginning */
237 telnet_write(connection
, "\r", 1);
238 telnet_prompt(connection
);
240 /* initialize history */
241 for (i
= 0; i
< TELNET_LINE_HISTORY_SIZE
; i
++)
242 telnet_connection
->history
[i
] = NULL
;
243 telnet_connection
->next_history
= 0;
244 telnet_connection
->current_history
= 0;
245 telnet_load_history(telnet_connection
);
247 log_add_callback(telnet_log_callback
, connection
);
252 static void telnet_clear_line(struct connection
*connection
,
253 struct telnet_connection
*t_con
)
255 /* move to end of line */
256 if (t_con
->line_cursor
< t_con
->line_size
)
257 telnet_write(connection
,
258 t_con
->line
+ t_con
->line_cursor
,
259 t_con
->line_size
- t_con
->line_cursor
);
261 /* backspace, overwrite with space, backspace */
262 while (t_con
->line_size
> 0) {
263 telnet_write(connection
, "\b \b", 3);
266 t_con
->line_cursor
= 0;
269 static int telnet_input(struct connection
*connection
)
272 unsigned char buffer
[TELNET_BUFFER_SIZE
];
273 unsigned char *buf_p
;
274 struct telnet_connection
*t_con
= connection
->priv
;
275 struct command_context
*command_context
= connection
->cmd_ctx
;
277 bytes_read
= connection_read(connection
, buffer
, TELNET_BUFFER_SIZE
);
280 return ERROR_SERVER_REMOTE_CLOSED
;
281 else if (bytes_read
== -1) {
282 LOG_ERROR("error during read: %s", strerror(errno
));
283 return ERROR_SERVER_REMOTE_CLOSED
;
288 switch (t_con
->state
) {
289 case TELNET_STATE_DATA
:
291 t_con
->state
= TELNET_STATE_IAC
;
293 if (isprint(*buf_p
)) { /* printable character */
294 /* watch buffer size leaving one spare character for
295 * string null termination */
296 if (t_con
->line_size
== TELNET_LINE_MAX_SIZE
-1) {
297 /* output audible bell if buffer is full
298 * "\a" does not work, at least on windows */
299 telnet_write(connection
, "\x07", 1);
300 } else if (t_con
->line_cursor
== t_con
->line_size
) {
301 telnet_write(connection
, buf_p
, 1);
302 t_con
->line
[t_con
->line_size
++] = *buf_p
;
303 t_con
->line_cursor
++;
306 memmove(t_con
->line
+ t_con
->line_cursor
+ 1,
307 t_con
->line
+ t_con
->line_cursor
,
308 t_con
->line_size
- t_con
->line_cursor
);
309 t_con
->line
[t_con
->line_cursor
] = *buf_p
;
311 telnet_write(connection
,
312 t_con
->line
+ t_con
->line_cursor
,
313 t_con
->line_size
- t_con
->line_cursor
);
314 t_con
->line_cursor
++;
315 for (i
= t_con
->line_cursor
; i
< t_con
->line_size
; i
++)
316 telnet_write(connection
, "\b", 1);
318 } else { /* non-printable */
319 if (*buf_p
== 0x1b) { /* escape */
320 t_con
->state
= TELNET_STATE_ESCAPE
;
321 t_con
->last_escape
= '\x00';
322 } else if ((*buf_p
== 0xd) || (*buf_p
== 0xa)) { /* CR/LF */
325 /* skip over combinations with CR/LF and NUL characters */
326 if ((bytes_read
> 1) && ((*(buf_p
+ 1) == 0xa) ||
327 (*(buf_p
+ 1) == 0xd))) {
331 if ((bytes_read
> 1) && (*(buf_p
+ 1) == 0)) {
335 t_con
->line
[t_con
->line_size
] = 0;
337 telnet_write(connection
, "\r\n\x00", 3);
339 if (strcmp(t_con
->line
, "history") == 0) {
341 for (i
= 1; i
< TELNET_LINE_HISTORY_SIZE
; i
++) {
342 /* the t_con->next_history line contains empty string
343 * (unless NULL), thus it is not printed */
344 char *history_line
= t_con
->history
[(t_con
->
346 TELNET_LINE_HISTORY_SIZE
];
348 telnet_write(connection
, history_line
,
349 strlen(history_line
));
350 telnet_write(connection
, "\r\n\x00", 3);
353 t_con
->line_size
= 0;
354 t_con
->line_cursor
= 0;
358 /* save only non-blank not repeating lines in the history */
359 char *prev_line
= t_con
->history
[(t_con
->current_history
> 0) ?
360 t_con
->current_history
- 1 : TELNET_LINE_HISTORY_SIZE
-1];
361 if (*t_con
->line
&& (prev_line
== NULL
||
362 strcmp(t_con
->line
, prev_line
))) {
363 /* if the history slot is already taken, free it */
364 if (t_con
->history
[t_con
->next_history
])
365 free(t_con
->history
[t_con
->next_history
]);
367 /* add line to history */
368 t_con
->history
[t_con
->next_history
] = strdup(t_con
->line
);
370 /* wrap history at TELNET_LINE_HISTORY_SIZE */
371 t_con
->next_history
= (t_con
->next_history
+ 1) %
372 TELNET_LINE_HISTORY_SIZE
;
374 /* current history line starts at the new entry */
375 t_con
->current_history
=
378 if (t_con
->history
[t_con
->current_history
])
379 free(t_con
->history
[t_con
->current_history
]);
380 t_con
->history
[t_con
->current_history
] = strdup("");
383 t_con
->line_size
= 0;
385 /* to suppress prompt in log callback during command execution */
386 t_con
->line_cursor
= -1;
388 if (strcmp(t_con
->line
, "shutdown") == 0)
389 telnet_save_history(t_con
);
391 retval
= command_run_line(command_context
, t_con
->line
);
393 t_con
->line_cursor
= 0;
395 if (retval
== ERROR_COMMAND_CLOSE_CONNECTION
)
396 return ERROR_SERVER_REMOTE_CLOSED
;
398 /* the prompt is always * placed at the line beginning */
399 telnet_write(connection
, "\r", 1);
401 retval
= telnet_prompt(connection
);
402 if (retval
== ERROR_SERVER_REMOTE_CLOSED
)
403 return ERROR_SERVER_REMOTE_CLOSED
;
405 } else if ((*buf_p
== 0x7f) || (*buf_p
== 0x8)) { /* delete character */
406 if (t_con
->line_cursor
> 0) {
407 if (t_con
->line_cursor
!= t_con
->line_size
) {
409 telnet_write(connection
, "\b", 1);
410 t_con
->line_cursor
--;
412 memmove(t_con
->line
+ t_con
->line_cursor
,
413 t_con
->line
+ t_con
->line_cursor
+ 1,
417 telnet_write(connection
,
418 t_con
->line
+ t_con
->line_cursor
,
421 telnet_write(connection
, " \b", 2);
422 for (i
= t_con
->line_cursor
; i
< t_con
->line_size
; i
++)
423 telnet_write(connection
, "\b", 1);
426 t_con
->line_cursor
--;
427 /* back space: move the 'printer' head one char
428 * back, overwrite with space, move back again */
429 telnet_write(connection
, "\b \b", 3);
432 } else if (*buf_p
== 0x15) /* clear line */
433 telnet_clear_line(connection
, t_con
);
434 else if (*buf_p
== CTRL('B')) { /* cursor left */
435 if (t_con
->line_cursor
> 0) {
436 telnet_write(connection
, "\b", 1);
437 t_con
->line_cursor
--;
439 t_con
->state
= TELNET_STATE_DATA
;
440 } else if (*buf_p
== CTRL('F')) { /* cursor right */
441 if (t_con
->line_cursor
< t_con
->line_size
)
442 telnet_write(connection
, t_con
->line
+ t_con
->line_cursor
++, 1);
443 t_con
->state
= TELNET_STATE_DATA
;
445 LOG_DEBUG("unhandled nonprintable: %2.2x", *buf_p
);
449 case TELNET_STATE_IAC
:
452 t_con
->state
= TELNET_STATE_DONT
;
455 t_con
->state
= TELNET_STATE_DO
;
458 t_con
->state
= TELNET_STATE_WONT
;
461 t_con
->state
= TELNET_STATE_WILL
;
465 case TELNET_STATE_SB
:
467 case TELNET_STATE_SE
:
469 case TELNET_STATE_WILL
:
470 case TELNET_STATE_WONT
:
471 case TELNET_STATE_DO
:
472 case TELNET_STATE_DONT
:
473 t_con
->state
= TELNET_STATE_DATA
;
475 case TELNET_STATE_ESCAPE
:
476 if (t_con
->last_escape
== '[') {
477 if (*buf_p
== 'D') { /* cursor left */
478 if (t_con
->line_cursor
> 0) {
479 telnet_write(connection
, "\b", 1);
480 t_con
->line_cursor
--;
482 t_con
->state
= TELNET_STATE_DATA
;
483 } else if (*buf_p
== 'C') { /* cursor right */
484 if (t_con
->line_cursor
< t_con
->line_size
)
485 telnet_write(connection
,
486 t_con
->line
+ t_con
->line_cursor
++, 1);
487 t_con
->state
= TELNET_STATE_DATA
;
488 } else if (*buf_p
== 'A') { /* cursor up */
489 int last_history
= (t_con
->current_history
> 0) ?
490 t_con
->current_history
- 1 : TELNET_LINE_HISTORY_SIZE
-1;
491 if (t_con
->history
[last_history
]) {
492 telnet_clear_line(connection
, t_con
);
493 t_con
->line_size
= strlen(t_con
->history
[last_history
]);
494 t_con
->line_cursor
= t_con
->line_size
;
495 memcpy(t_con
->line
, t_con
->history
[last_history
], t_con
->line_size
);
496 telnet_write(connection
, t_con
->line
, t_con
->line_size
);
497 t_con
->current_history
= last_history
;
499 t_con
->state
= TELNET_STATE_DATA
;
500 } else if (*buf_p
== 'B') { /* cursor down */
501 int next_history
= (t_con
->current_history
+ 1) % TELNET_LINE_HISTORY_SIZE
;
502 if (t_con
->history
[next_history
]) {
503 telnet_clear_line(connection
, t_con
);
504 t_con
->line_size
= strlen(t_con
->history
[next_history
]);
505 t_con
->line_cursor
= t_con
->line_size
;
506 memcpy(t_con
->line
, t_con
->history
[next_history
], t_con
->line_size
);
507 telnet_write(connection
, t_con
->line
, t_con
->line_size
);
508 t_con
->current_history
= next_history
;
510 t_con
->state
= TELNET_STATE_DATA
;
511 } else if (*buf_p
== '3')
512 t_con
->last_escape
= *buf_p
;
514 t_con
->state
= TELNET_STATE_DATA
;
515 } else if (t_con
->last_escape
== '3') {
516 /* Remove character */
518 if (t_con
->line_cursor
< t_con
->line_size
) {
521 /* remove char from line buffer */
522 memmove(t_con
->line
+ t_con
->line_cursor
,
523 t_con
->line
+ t_con
->line_cursor
+ 1,
524 t_con
->line_size
- t_con
->line_cursor
);
526 /* print remainder of buffer */
527 telnet_write(connection
, t_con
->line
+ t_con
->line_cursor
,
528 t_con
->line_size
- t_con
->line_cursor
);
529 /* overwrite last char with whitespace */
530 telnet_write(connection
, " \b", 2);
532 /* move back to cursor position*/
533 for (i
= t_con
->line_cursor
; i
< t_con
->line_size
; i
++)
534 telnet_write(connection
, "\b", 1);
537 t_con
->state
= TELNET_STATE_DATA
;
539 t_con
->state
= TELNET_STATE_DATA
;
540 } else if (t_con
->last_escape
== '\x00') {
542 t_con
->last_escape
= *buf_p
;
544 t_con
->state
= TELNET_STATE_DATA
;
546 LOG_ERROR("BUG: unexpected value in t_con->last_escape");
547 t_con
->state
= TELNET_STATE_DATA
;
552 LOG_ERROR("unknown telnet state");
563 static int telnet_connection_closed(struct connection
*connection
)
565 struct telnet_connection
*t_con
= connection
->priv
;
568 log_remove_callback(telnet_log_callback
, connection
);
572 t_con
->prompt
= NULL
;
575 /* save telnet history */
576 telnet_save_history(t_con
);
578 for (i
= 0; i
< TELNET_LINE_HISTORY_SIZE
; i
++) {
579 if (t_con
->history
[i
]) {
580 free(t_con
->history
[i
]);
581 t_con
->history
[i
] = NULL
;
585 /* if this connection registered a debug-message receiver delete it */
586 delete_debug_msg_receiver(connection
->cmd_ctx
, NULL
);
588 if (connection
->priv
) {
589 free(connection
->priv
);
590 connection
->priv
= NULL
;
592 LOG_ERROR("BUG: connection->priv == NULL");
597 int telnet_init(char *banner
)
599 if (strcmp(telnet_port
, "disabled") == 0) {
600 LOG_INFO("telnet server disabled");
604 struct telnet_service
*telnet_service
= malloc(sizeof(struct telnet_service
));
606 telnet_service
->banner
= banner
;
608 return add_service("telnet",
611 telnet_new_connection
,
613 telnet_connection_closed
,
617 /* daemon configuration command telnet_port */
618 COMMAND_HANDLER(handle_telnet_port_command
)
620 return CALL_COMMAND_HANDLER(server_pipe_command
, &telnet_port
);
623 COMMAND_HANDLER(handle_exit_command
)
625 return ERROR_COMMAND_CLOSE_CONNECTION
;
628 static const struct command_registration telnet_command_handlers
[] = {
631 .handler
= handle_exit_command
,
632 .mode
= COMMAND_EXEC
,
634 .help
= "exit telnet session",
637 .name
= "telnet_port",
638 .handler
= handle_telnet_port_command
,
640 .help
= "Specify port on which to listen "
641 "for incoming telnet connections. "
642 "Read help on 'gdb_port'.",
643 .usage
= "[port_num]",
645 COMMAND_REGISTRATION_DONE
648 int telnet_register_commands(struct command_context
*cmd_ctx
)
650 telnet_port
= strdup("4444");
651 return register_commands(cmd_ctx
, NULL
, telnet_command_handlers
);
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| =+=.+ + E |
|. .=o . o |
+----[SHA256]-----+
2048 SHA256:0Onrb7/PHjpo6iVZ7xQX2riKN83FJ3KGU0TvI0TaFG4 gerrit-code-review@openocd.zylin.com (RSA)