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, see <http://www.gnu.org/licenses/>. *
23 ***************************************************************************/
29 #include "telnet_server.h"
30 #include <target/target_request.h>
31 #include <helper/configuration.h>
32 #include <helper/list.h>
34 static char *telnet_port
;
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 */
42 #define CTRL(c) (c - '@')
43 #define TELNET_HISTORY ".openocd_history"
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
49 static int telnet_write(struct connection
*connection
, const void *data
,
52 struct telnet_connection
*t_con
= connection
->priv
;
54 return ERROR_SERVER_REMOTE_CLOSED
;
56 if (connection_write(connection
, data
, len
) == len
)
59 return ERROR_SERVER_REMOTE_CLOSED
;
62 /* output an audible bell */
63 static int telnet_bell(struct connection
*connection
)
65 /* ("\a" does not work, at least on windows) */
66 return telnet_write(connection
, "\x07", 1);
69 static int telnet_prompt(struct connection
*connection
)
71 struct telnet_connection
*t_con
= connection
->priv
;
73 return telnet_write(connection
, t_con
->prompt
, strlen(t_con
->prompt
));
76 static int telnet_outputline(struct connection
*connection
, const char *line
)
80 /* process lines in buffer */
82 char *line_end
= strchr(line
, '\n');
89 telnet_write(connection
, line
, len
);
91 telnet_write(connection
, "\r\n", 2);
100 static int telnet_output(struct command_context
*cmd_ctx
, const char *line
)
102 struct connection
*connection
= cmd_ctx
->output_handler_priv
;
104 return telnet_outputline(connection
, line
);
107 static void telnet_log_callback(void *priv
, const char *file
, unsigned line
,
108 const char *function
, const char *string
)
110 struct connection
*connection
= priv
;
111 struct telnet_connection
*t_con
= connection
->priv
;
115 /* If the prompt is not visible, simply output the message. */
116 if (!t_con
->prompt_visible
) {
117 telnet_outputline(connection
, string
);
121 /* Clear the command line. */
122 tmp
= strlen(t_con
->prompt
) + t_con
->line_size
;
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",
128 for (i
= 0; i
< tmp
; i
+= 16)
129 telnet_write(connection
, " ", MIN(tmp
- i
, 16));
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",
135 telnet_outputline(connection
, string
);
137 /* Put the command line to its previous state. */
138 telnet_prompt(connection
);
139 telnet_write(connection
, t_con
->line
, t_con
->line_size
);
141 for (i
= t_con
->line_cursor
; i
< t_con
->line_size
; i
++)
142 telnet_write(connection
, "\b", 1);
145 static void telnet_load_history(struct telnet_connection
*t_con
)
148 char buffer
[TELNET_BUFFER_SIZE
];
151 char *history
= get_home_dir(TELNET_HISTORY
);
153 if (history
== NULL
) {
154 LOG_INFO("unable to get user home directory, telnet history will be disabled");
158 histfp
= fopen(history
, "rb");
162 while (fgets(buffer
, sizeof(buffer
), histfp
) != NULL
) {
164 char *p
= strchr(buffer
, '\n');
167 if (buffer
[0] && i
< TELNET_LINE_HISTORY_SIZE
)
168 t_con
->history
[i
++] = strdup(buffer
);
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;
181 static void telnet_save_history(struct telnet_connection
*t_con
)
187 char *history
= get_home_dir(TELNET_HISTORY
);
189 if (history
== NULL
) {
190 LOG_INFO("unable to get user home directory, telnet history will be disabled");
194 histfp
= fopen(history
, "wb");
198 num
= TELNET_LINE_HISTORY_SIZE
;
199 i
= t_con
->current_history
+ 1;
200 i
%= TELNET_LINE_HISTORY_SIZE
;
202 while (t_con
->history
[i
] == NULL
&& num
> 0) {
204 i
%= TELNET_LINE_HISTORY_SIZE
;
209 for (; num
> 0; num
--) {
210 fprintf(histfp
, "%s\n", t_con
->history
[i
]);
212 i
%= TELNET_LINE_HISTORY_SIZE
;
221 static int telnet_new_connection(struct connection
*connection
)
223 struct telnet_connection
*telnet_connection
;
224 struct telnet_service
*telnet_service
= connection
->service
->priv
;
227 telnet_connection
= malloc(sizeof(struct telnet_connection
));
229 if (!telnet_connection
) {
230 LOG_ERROR("Failed to allocate telnet connection.");
234 connection
->priv
= telnet_connection
;
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
;
244 /* output goes through telnet connection */
245 command_set_output_handler(connection
->cmd_ctx
, telnet_output
, connection
);
247 /* negotiate telnet options */
248 telnet_write(connection
, negotiate
, strlen(negotiate
));
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);
256 /* the prompt is always placed at the line beginning */
257 telnet_write(connection
, "\r", 1);
258 telnet_prompt(connection
);
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
);
267 log_add_callback(telnet_log_callback
, connection
);
272 static void telnet_clear_line(struct connection
*connection
,
273 struct telnet_connection
*t_con
)
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
);
281 /* backspace, overwrite with space, backspace */
282 while (t_con
->line_size
> 0) {
283 telnet_write(connection
, "\b \b", 3);
286 t_con
->line_cursor
= 0;
289 static void telnet_history_go(struct connection
*connection
, int idx
)
291 struct telnet_connection
*t_con
= connection
->priv
;
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
;
301 t_con
->state
= TELNET_STATE_DATA
;
304 static void telnet_history_up(struct connection
*connection
)
306 struct telnet_connection
*t_con
= connection
->priv
;
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
);
314 static void telnet_history_down(struct connection
*connection
)
316 struct telnet_connection
*t_con
= connection
->priv
;
319 next_history
= (t_con
->current_history
+ 1) % TELNET_LINE_HISTORY_SIZE
;
320 telnet_history_go(connection
, next_history
);
323 static int telnet_history_print(struct connection
*connection
)
325 struct telnet_connection
*tc
;
327 tc
= connection
->priv
;
329 for (size_t i
= 1; i
< TELNET_LINE_HISTORY_SIZE
; i
++) {
333 * The tc->next_history line contains empty string (unless NULL), thus
336 line
= tc
->history
[(tc
->next_history
+ i
) % TELNET_LINE_HISTORY_SIZE
];
339 telnet_write(connection
, line
, strlen(line
));
340 telnet_write(connection
, "\r\n\x00", 3);
347 /* The prompt is always placed at the line beginning. */
348 telnet_write(connection
, "\r", 1);
350 return telnet_prompt(connection
);
353 static void telnet_move_cursor(struct connection
*connection
, size_t pos
)
355 struct telnet_connection
*tc
;
358 tc
= connection
->priv
;
360 if (pos
< tc
->line_cursor
) {
361 tmp
= tc
->line_cursor
- pos
;
363 for (size_t i
= 0; i
< tmp
; i
+= 16)
364 telnet_write(connection
, "\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b",
367 tmp
= pos
- tc
->line_cursor
;
369 for (size_t i
= 0; i
< tmp
; i
+= 16)
370 telnet_write(connection
, tc
->line
+ tc
->line_cursor
+ i
,
374 tc
->line_cursor
= pos
;
377 /* check buffer size leaving one spare character for string null termination */
378 static inline bool telnet_can_insert(struct connection
*connection
, size_t len
)
380 struct telnet_connection
*t_con
= connection
->priv
;
382 return t_con
->line_size
+ len
< TELNET_LINE_MAX_SIZE
;
385 /* write to telnet console, and update the telnet_connection members
386 * this function is capable of inserting in the middle of a line
387 * please ensure that data does not contain special characters (\n, \r, \t, \b ...)
389 * returns false when it fails to insert the requested data
391 static bool telnet_insert(struct connection
*connection
, const void *data
, size_t len
)
393 struct telnet_connection
*t_con
= connection
->priv
;
395 if (!telnet_can_insert(connection
, len
)) {
396 telnet_bell(connection
);
400 if (t_con
->line_cursor
< t_con
->line_size
) {
401 /* we have some content after the cursor */
402 memmove(t_con
->line
+ t_con
->line_cursor
+ len
,
403 t_con
->line
+ t_con
->line_cursor
,
404 t_con
->line_size
- t_con
->line_cursor
);
407 strncpy(t_con
->line
+ t_con
->line_cursor
, data
, len
);
409 telnet_write(connection
,
410 t_con
->line
+ t_con
->line_cursor
,
411 t_con
->line_size
+ len
- t_con
->line_cursor
);
413 t_con
->line_size
+= len
;
414 t_con
->line_cursor
+= len
;
416 for (size_t i
= t_con
->line_cursor
; i
< t_con
->line_size
; i
++)
417 telnet_write(connection
, "\b", 1);
422 static void telnet_auto_complete(struct connection
*connection
)
424 struct telnet_connection
*t_con
= connection
->priv
;
425 struct command_context
*command_context
= connection
->cmd_ctx
;
434 /* user command sequence, either at line beginning
435 * or we start over after these characters ';', '[', '{' */
436 size_t seq_start
= (t_con
->line_cursor
== 0) ? 0 : (t_con
->line_cursor
- 1);
437 while (seq_start
> 0) {
438 char c
= t_con
->line
[seq_start
];
439 if (c
== ';' || c
== '[' || c
== '{') {
447 /* user command position in the line, ignore leading spaces */
448 size_t usr_cmd_pos
= seq_start
;
449 while ((usr_cmd_pos
< t_con
->line_cursor
) && isspace(t_con
->line
[usr_cmd_pos
]))
452 /* user command length */
453 size_t usr_cmd_len
= t_con
->line_cursor
- usr_cmd_pos
;
455 /* optimize multiple spaces in the user command,
456 * because info commands does not tolerate multiple spaces */
457 size_t optimized_spaces
= 0;
458 char query
[usr_cmd_len
+ 1];
459 for (size_t i
= 0; i
< usr_cmd_len
; i
++) {
460 if ((i
< usr_cmd_len
- 1) && isspace(t_con
->line
[usr_cmd_pos
+ i
])
461 && isspace(t_con
->line
[usr_cmd_pos
+ i
+ 1])) {
466 query
[i
- optimized_spaces
] = t_con
->line
[usr_cmd_pos
+ i
];
469 usr_cmd_len
-= optimized_spaces
;
470 query
[usr_cmd_len
] = '\0';
472 /* filter commands */
473 char *query_cmd
= alloc_printf("_telnet_autocomplete_helper {%s*}", query
);
476 LOG_ERROR("Out of memory");
480 int retval
= Jim_EvalSource(command_context
->interp
, __FILE__
, __LINE__
, query_cmd
);
482 if (retval
!= JIM_OK
)
485 Jim_Obj
*list
= Jim_GetResult(command_context
->interp
);
486 Jim_IncrRefCount(list
);
488 /* common prefix length of the matched commands */
489 size_t common_len
= 0;
490 char *first_match
= NULL
; /* used to compute the common prefix length */
492 int len
= Jim_ListLength(command_context
->interp
, list
);
493 for (int i
= 0; i
< len
; i
++) {
494 Jim_Obj
*elem
= Jim_ListGetIndex(command_context
->interp
, list
, i
);
495 Jim_IncrRefCount(elem
);
497 char *name
= (char *)Jim_GetString(elem
, NULL
);
499 /* validate the command */
500 bool ignore_cmd
= false;
501 Jim_Cmd
*jim_cmd
= Jim_GetCommand(command_context
->interp
, elem
, JIM_NONE
);
504 /* Why we are here? Let's ignore it! */
506 } else if (jimcmd_is_oocd_command(jim_cmd
)) {
507 struct command
*cmd
= jimcmd_privdata(jim_cmd
);
509 if (cmd
&& !cmd
->handler
&& !cmd
->jim_handler
) {
510 /* Initial part of a multi-word command. Ignore it! */
512 } else if (cmd
&& cmd
->mode
== COMMAND_CONFIG
) {
513 /* Not executable after config phase. Ignore it! */
518 /* save the command in the prediction list */
520 struct cmd_match
*match
= calloc(1, sizeof(struct cmd_match
));
522 LOG_ERROR("Out of memory");
523 Jim_DecrRefCount(command_context
->interp
, elem
);
524 break; /* break the for loop */
527 if (list_empty(&matches
)) {
528 common_len
= strlen(name
);
531 size_t new_common_len
= usr_cmd_len
; /* save some loops */
533 while (new_common_len
< common_len
&& first_match
[new_common_len
] == name
[new_common_len
])
536 common_len
= new_common_len
;
540 list_add_tail(&match
->lh
, &matches
);
543 Jim_DecrRefCount(command_context
->interp
, elem
);
545 /* end of command filtering */
547 /* proceed with auto-completion */
548 if (list_empty(&matches
))
549 telnet_bell(connection
);
550 else if (common_len
== usr_cmd_len
&& list_is_singular(&matches
) && t_con
->line_cursor
== t_con
->line_size
)
551 telnet_insert(connection
, " ", 1);
552 else if (common_len
> usr_cmd_len
) {
553 int completion_size
= common_len
- usr_cmd_len
;
554 if (telnet_insert(connection
, first_match
+ usr_cmd_len
, completion_size
)) {
555 /* in bash this extra space is only added when the cursor in at the end of line */
556 if (list_is_singular(&matches
) && t_con
->line_cursor
== t_con
->line_size
)
557 telnet_insert(connection
, " ", 1);
559 } else if (!list_is_singular(&matches
)) {
560 telnet_write(connection
, "\n\r", 2);
562 struct cmd_match
*match
;
563 list_for_each_entry(match
, &matches
, lh
) {
564 telnet_write(connection
, match
->cmd
, strlen(match
->cmd
));
565 telnet_write(connection
, "\n\r", 2);
568 telnet_prompt(connection
);
569 telnet_write(connection
, t_con
->line
, t_con
->line_size
);
571 /* restore the terminal visible cursor location */
572 for (size_t i
= t_con
->line_cursor
; i
< t_con
->line_size
; i
++)
573 telnet_write(connection
, "\b", 1);
576 /* destroy the command_list */
577 struct cmd_match
*tmp
, *match
;
578 list_for_each_entry_safe(match
, tmp
, &matches
, lh
)
581 Jim_DecrRefCount(command_context
->interp
, list
);
584 static int telnet_input(struct connection
*connection
)
587 unsigned char buffer
[TELNET_BUFFER_SIZE
];
588 unsigned char *buf_p
;
589 struct telnet_connection
*t_con
= connection
->priv
;
590 struct command_context
*command_context
= connection
->cmd_ctx
;
592 bytes_read
= connection_read(connection
, buffer
, TELNET_BUFFER_SIZE
);
595 return ERROR_SERVER_REMOTE_CLOSED
;
596 else if (bytes_read
== -1) {
597 LOG_ERROR("error during read: %s", strerror(errno
));
598 return ERROR_SERVER_REMOTE_CLOSED
;
603 switch (t_con
->state
) {
604 case TELNET_STATE_DATA
:
606 t_con
->state
= TELNET_STATE_IAC
;
608 if (isprint(*buf_p
)) { /* printable character */
609 telnet_insert(connection
, buf_p
, 1);
610 } else { /* non-printable */
611 if (*buf_p
== 0x1b) { /* escape */
612 t_con
->state
= TELNET_STATE_ESCAPE
;
613 t_con
->last_escape
= '\x00';
614 } else if ((*buf_p
== 0xd) || (*buf_p
== 0xa)) { /* CR/LF */
617 /* skip over combinations with CR/LF and NUL characters */
618 if ((bytes_read
> 1) && ((*(buf_p
+ 1) == 0xa) ||
619 (*(buf_p
+ 1) == 0xd))) {
623 if ((bytes_read
> 1) && (*(buf_p
+ 1) == 0)) {
627 t_con
->line
[t_con
->line_size
] = 0;
629 telnet_write(connection
, "\r\n\x00", 3);
631 if (strcmp(t_con
->line
, "history") == 0) {
632 retval
= telnet_history_print(connection
);
634 if (retval
!= ERROR_OK
)
640 /* save only non-blank not repeating lines in the history */
641 char *prev_line
= t_con
->history
[(t_con
->current_history
> 0) ?
642 t_con
->current_history
- 1 : TELNET_LINE_HISTORY_SIZE
-1];
643 if (*t_con
->line
&& (prev_line
== NULL
||
644 strcmp(t_con
->line
, prev_line
))) {
645 /* if the history slot is already taken, free it */
646 free(t_con
->history
[t_con
->next_history
]);
648 /* add line to history */
649 t_con
->history
[t_con
->next_history
] = strdup(t_con
->line
);
651 /* wrap history at TELNET_LINE_HISTORY_SIZE */
652 t_con
->next_history
= (t_con
->next_history
+ 1) %
653 TELNET_LINE_HISTORY_SIZE
;
655 /* current history line starts at the new entry */
656 t_con
->current_history
=
659 free(t_con
->history
[t_con
->current_history
]);
660 t_con
->history
[t_con
->current_history
] = strdup("");
663 t_con
->line_size
= 0;
665 /* to suppress prompt in log callback during command execution */
666 t_con
->prompt_visible
= false;
668 if (strcmp(t_con
->line
, "shutdown") == 0)
669 telnet_save_history(t_con
);
671 retval
= command_run_line(command_context
, t_con
->line
);
673 t_con
->line_cursor
= 0;
674 t_con
->prompt_visible
= true;
676 if (retval
== ERROR_COMMAND_CLOSE_CONNECTION
)
677 return ERROR_SERVER_REMOTE_CLOSED
;
679 /* the prompt is always * placed at the line beginning */
680 telnet_write(connection
, "\r", 1);
682 retval
= telnet_prompt(connection
);
683 if (retval
== ERROR_SERVER_REMOTE_CLOSED
)
684 return ERROR_SERVER_REMOTE_CLOSED
;
686 } else if ((*buf_p
== 0x7f) || (*buf_p
== 0x8)) { /* delete character */
687 if (t_con
->line_cursor
> 0) {
688 if (t_con
->line_cursor
!= t_con
->line_size
) {
690 telnet_write(connection
, "\b", 1);
691 t_con
->line_cursor
--;
693 memmove(t_con
->line
+ t_con
->line_cursor
,
694 t_con
->line
+ t_con
->line_cursor
+ 1,
698 telnet_write(connection
,
699 t_con
->line
+ t_con
->line_cursor
,
702 telnet_write(connection
, " \b", 2);
703 for (i
= t_con
->line_cursor
; i
< t_con
->line_size
; i
++)
704 telnet_write(connection
, "\b", 1);
707 t_con
->line_cursor
--;
708 /* back space: move the 'printer' head one char
709 * back, overwrite with space, move back again */
710 telnet_write(connection
, "\b \b", 3);
713 } else if (*buf_p
== 0x15) /* clear line */
714 telnet_clear_line(connection
, t_con
);
715 else if (*buf_p
== CTRL('B')) { /* cursor left */
716 if (t_con
->line_cursor
> 0) {
717 telnet_write(connection
, "\b", 1);
718 t_con
->line_cursor
--;
720 t_con
->state
= TELNET_STATE_DATA
;
721 } else if (*buf_p
== CTRL('F')) { /* cursor right */
722 if (t_con
->line_cursor
< t_con
->line_size
)
723 telnet_write(connection
, t_con
->line
+ t_con
->line_cursor
++, 1);
724 t_con
->state
= TELNET_STATE_DATA
;
725 } else if (*buf_p
== CTRL('P')) /* cursor up */
726 telnet_history_up(connection
);
727 else if (*buf_p
== CTRL('N')) /* cursor down */
728 telnet_history_down(connection
);
729 else if (*buf_p
== CTRL('A'))
730 telnet_move_cursor(connection
, 0);
731 else if (*buf_p
== CTRL('E'))
732 telnet_move_cursor(connection
, t_con
->line_size
);
733 else if (*buf_p
== CTRL('K')) { /* kill line to end */
734 if (t_con
->line_cursor
< t_con
->line_size
) {
735 /* overwrite with space, until end of line, move back */
736 for (size_t i
= t_con
->line_cursor
; i
< t_con
->line_size
; i
++)
737 telnet_write(connection
, " ", 1);
738 for (size_t i
= t_con
->line_cursor
; i
< t_con
->line_size
; i
++)
739 telnet_write(connection
, "\b", 1);
740 t_con
->line
[t_con
->line_cursor
] = '\0';
741 t_con
->line_size
= t_con
->line_cursor
;
743 } else if (*buf_p
== '\t')
744 telnet_auto_complete(connection
);
746 LOG_DEBUG("unhandled nonprintable: %2.2x", *buf_p
);
750 case TELNET_STATE_IAC
:
753 t_con
->state
= TELNET_STATE_DONT
;
756 t_con
->state
= TELNET_STATE_DO
;
759 t_con
->state
= TELNET_STATE_WONT
;
762 t_con
->state
= TELNET_STATE_WILL
;
766 case TELNET_STATE_SB
:
768 case TELNET_STATE_SE
:
770 case TELNET_STATE_WILL
:
771 case TELNET_STATE_WONT
:
772 case TELNET_STATE_DO
:
773 case TELNET_STATE_DONT
:
774 t_con
->state
= TELNET_STATE_DATA
;
776 case TELNET_STATE_ESCAPE
:
777 if (t_con
->last_escape
== '[') {
778 if (*buf_p
== 'D') { /* cursor left */
779 if (t_con
->line_cursor
> 0) {
780 telnet_write(connection
, "\b", 1);
781 t_con
->line_cursor
--;
783 t_con
->state
= TELNET_STATE_DATA
;
784 } else if (*buf_p
== 'C') { /* cursor right */
785 if (t_con
->line_cursor
< t_con
->line_size
)
786 telnet_write(connection
,
787 t_con
->line
+ t_con
->line_cursor
++, 1);
788 t_con
->state
= TELNET_STATE_DATA
;
789 } else if (*buf_p
== 'A') { /* cursor up */
790 telnet_history_up(connection
);
791 } else if (*buf_p
== 'B') { /* cursor down */
792 telnet_history_down(connection
);
793 } else if (*buf_p
== 'F') { /* end key */
794 telnet_move_cursor(connection
, t_con
->line_size
);
795 t_con
->state
= TELNET_STATE_DATA
;
796 } else if (*buf_p
== 'H') { /* home key */
797 telnet_move_cursor(connection
, 0);
798 t_con
->state
= TELNET_STATE_DATA
;
799 } else if (*buf_p
== '3')
800 t_con
->last_escape
= *buf_p
;
802 t_con
->state
= TELNET_STATE_DATA
;
803 } else if (t_con
->last_escape
== '3') {
804 /* Remove character */
806 if (t_con
->line_cursor
< t_con
->line_size
) {
809 /* remove char from line buffer */
810 memmove(t_con
->line
+ t_con
->line_cursor
,
811 t_con
->line
+ t_con
->line_cursor
+ 1,
812 t_con
->line_size
- t_con
->line_cursor
);
814 /* print remainder of buffer */
815 telnet_write(connection
, t_con
->line
+ t_con
->line_cursor
,
816 t_con
->line_size
- t_con
->line_cursor
);
817 /* overwrite last char with whitespace */
818 telnet_write(connection
, " \b", 2);
820 /* move back to cursor position*/
821 for (i
= t_con
->line_cursor
; i
< t_con
->line_size
; i
++)
822 telnet_write(connection
, "\b", 1);
825 t_con
->state
= TELNET_STATE_DATA
;
827 t_con
->state
= TELNET_STATE_DATA
;
828 } else if (t_con
->last_escape
== '\x00') {
830 t_con
->last_escape
= *buf_p
;
832 t_con
->state
= TELNET_STATE_DATA
;
834 LOG_ERROR("BUG: unexpected value in t_con->last_escape");
835 t_con
->state
= TELNET_STATE_DATA
;
840 LOG_ERROR("unknown telnet state");
851 static int telnet_connection_closed(struct connection
*connection
)
853 struct telnet_connection
*t_con
= connection
->priv
;
856 log_remove_callback(telnet_log_callback
, connection
);
859 t_con
->prompt
= NULL
;
861 /* save telnet history */
862 telnet_save_history(t_con
);
864 for (i
= 0; i
< TELNET_LINE_HISTORY_SIZE
; i
++) {
865 free(t_con
->history
[i
]);
866 t_con
->history
[i
] = NULL
;
869 /* if this connection registered a debug-message receiver delete it */
870 delete_debug_msg_receiver(connection
->cmd_ctx
, NULL
);
872 free(connection
->priv
);
873 connection
->priv
= NULL
;
878 int telnet_init(char *banner
)
880 if (strcmp(telnet_port
, "disabled") == 0) {
881 LOG_INFO("telnet server disabled");
885 struct telnet_service
*telnet_service
=
886 malloc(sizeof(struct telnet_service
));
888 if (!telnet_service
) {
889 LOG_ERROR("Failed to allocate telnet service.");
893 telnet_service
->banner
= banner
;
895 int ret
= add_service("telnet", telnet_port
, CONNECTION_LIMIT_UNLIMITED
,
896 telnet_new_connection
, telnet_input
, telnet_connection_closed
,
899 if (ret
!= ERROR_OK
) {
900 free(telnet_service
);
907 /* daemon configuration command telnet_port */
908 COMMAND_HANDLER(handle_telnet_port_command
)
910 return CALL_COMMAND_HANDLER(server_pipe_command
, &telnet_port
);
913 COMMAND_HANDLER(handle_exit_command
)
915 return ERROR_COMMAND_CLOSE_CONNECTION
;
918 static const struct command_registration telnet_command_handlers
[] = {
921 .handler
= handle_exit_command
,
922 .mode
= COMMAND_EXEC
,
924 .help
= "exit telnet session",
927 .name
= "telnet_port",
928 .handler
= handle_telnet_port_command
,
929 .mode
= COMMAND_CONFIG
,
930 .help
= "Specify port on which to listen "
931 "for incoming telnet connections. "
932 "Read help on 'gdb_port'.",
933 .usage
= "[port_num]",
935 COMMAND_REGISTRATION_DONE
938 int telnet_register_commands(struct command_context
*cmd_ctx
)
940 telnet_port
= strdup("4444");
941 return register_commands(cmd_ctx
, NULL
, telnet_command_handlers
);
944 void telnet_service_free(void)
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