1
2
3
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
57
58
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
83
84
85
86
87
88
89
95
96
97
98
99
100
101
102
103
104
105
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
182
183
184
185
186
187
188
189
190
191
196
197
204
205
206
207
208
209
210
211
212
213
214
215
216
217
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
342
343
344
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
383
384
385
386
387
388
394
395
401
402
403
404
405
409
410
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
572
573
574
575
579
580
581
582
583
584
585
595
596
597
598
599
600
601
602
603
604
605
606
607
608
612
613
614
616
617
618
627
628
629
630
631
632
633
634
635
636
637
638
639
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
683
684
685
686
687
692
693
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
726
727
728
729
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
765
766
767
768
769
770
773
776
780
781
782
783
788
792
793
794
795
796
797
824
825
826
827
843
845
847
848
849
850
853
894
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
948
949
950
951
952
956
957
958
959
960
961
962
966
967
968
969
970
971
975
976
980
981
982
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1006
1007
/* ... */
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "telnet_server.h"
#include <target/target_request.h>
#include <helper/configuration.h>
#include <helper/list.h>
static char *telnet_port;
static char *negotiate =
"\xFF\xFB\x03"
"\xFF\xFB\x01"
"\xFF\xFD\x03"
"\xFF\xFE\x01";
#define CTRL(c) (c - '@')
#define TELNET_HISTORY ".openocd_history"
/* ... */
static int telnet_write(struct connection *connection, const void *data,
int len)
{
struct telnet_connection *t_con = connection->priv;
if (t_con->closed)
return ERROR_SERVER_REMOTE_CLOSED;
if (connection_write(connection, data, len) == len)
return ERROR_OK;
t_con->closed = true;
return ERROR_SERVER_REMOTE_CLOSED;
}{ ... }
static int telnet_bell(struct connection *connection)
{
return telnet_write(connection, "\x07", 1);
}{ ... }
static int telnet_prompt(struct connection *connection)
{
struct telnet_connection *t_con = connection->priv;
return telnet_write(connection, t_con->prompt, strlen(t_con->prompt));
}{ ... }
static int telnet_outputline(struct connection *connection, const char *line)
{
int len;
while (*line) {
char *line_end = strchr(line, '\n');
if (line_end)
len = line_end-line;
else
len = strlen(line);
telnet_write(connection, line, len);
if (line_end) {
telnet_write(connection, "\r\n", 2);
line += len + 1;
}if (line_end) { ... } else
line += len;
}while (*line) { ... }
return ERROR_OK;
}{ ... }
static int telnet_output(struct command_context *cmd_ctx, const char *line)
{
struct connection *connection = cmd_ctx->output_handler_priv;
return telnet_outputline(connection, line);
}{ ... }
static void telnet_log_callback(void *priv, const char *file, unsigned line,
const char *function, const char *string)
{
struct connection *connection = priv;
struct telnet_connection *t_con = connection->priv;
size_t i;
size_t tmp;
if (!t_con->prompt_visible) {
telnet_outputline(connection, string);
return;
}if (!t_con->prompt_visible) { ... }
tmp = strlen(t_con->prompt) + t_con->line_size;
for (i = 0; i < tmp; i += 16)
telnet_write(connection, "\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b",
MIN(tmp - i, 16));
for (i = 0; i < tmp; i += 16)
telnet_write(connection, " ", MIN(tmp - i, 16));
for (i = 0; i < tmp; i += 16)
telnet_write(connection, "\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b",
MIN(tmp - i, 16));
telnet_outputline(connection, string);
telnet_prompt(connection);
telnet_write(connection, t_con->line, t_con->line_size);
for (i = t_con->line_cursor; i < t_con->line_size; i++)
telnet_write(connection, "\b", 1);
}{ ... }
static void telnet_load_history(struct telnet_connection *t_con)
{
FILE *histfp;
char buffer[TELNET_BUFFER_SIZE];
int i = 0;
char *history = get_home_dir(TELNET_HISTORY);
if (!history) {
LOG_INFO("unable to get user home directory, telnet history will be disabled");
return;
}if (!history) { ... }
histfp = fopen(history, "rb");
if (histfp) {
while (fgets(buffer, sizeof(buffer), histfp)) {
char *p = strchr(buffer, '\n');
if (p)
*p = '\0';
if (buffer[0] && i < TELNET_LINE_HISTORY_SIZE)
t_con->history[i++] = strdup(buffer);
}while (fgets(buffer, sizeof(buffer), histfp)) { ... }
t_con->next_history = i;
t_con->next_history %= TELNET_LINE_HISTORY_SIZE;
t_con->current_history = t_con->next_history > 0 ? i - 1 : 0;
fclose(histfp);
}if (histfp) { ... }
free(history);
}{ ... }
static void telnet_save_history(struct telnet_connection *t_con)
{
FILE *histfp;
int i;
int num;
char *history = get_home_dir(TELNET_HISTORY);
if (!history) {
LOG_INFO("unable to get user home directory, telnet history will be disabled");
return;
}if (!history) { ... }
histfp = fopen(history, "wb");
if (histfp) {
num = TELNET_LINE_HISTORY_SIZE;
i = t_con->current_history + 1;
i %= TELNET_LINE_HISTORY_SIZE;
while (!t_con->history[i] && num > 0) {
i++;
i %= TELNET_LINE_HISTORY_SIZE;
num--;
}while (!t_con->history[i] && num > 0) { ... }
if (num > 0) {
for (; num > 0; num--) {
fprintf(histfp, "%s\n", t_con->history[i]);
i++;
i %= TELNET_LINE_HISTORY_SIZE;
}for (; num > 0; num--) { ... }
}if (num > 0) { ... }
fclose(histfp);
}if (histfp) { ... }
free(history);
}{ ... }
static int telnet_new_connection(struct connection *connection)
{
struct telnet_connection *telnet_connection;
struct telnet_service *telnet_service = connection->service->priv;
telnet_connection = calloc(1, sizeof(struct telnet_connection));
if (!telnet_connection) {
LOG_ERROR("Failed to allocate telnet connection.");
return ERROR_FAIL;
}if (!telnet_connection) { ... }
connection->priv = telnet_connection;
telnet_connection->prompt = strdup("> ");
telnet_connection->prompt_visible = true;
telnet_connection->state = TELNET_STATE_DATA;
command_set_output_handler(connection->cmd_ctx, telnet_output, connection);
telnet_write(connection, negotiate, strlen(negotiate));
if (telnet_service->banner) {
telnet_write(connection, telnet_service->banner, strlen(telnet_service->banner));
telnet_write(connection, "\r\n", 2);
}if (telnet_service->banner) { ... }
telnet_write(connection, "\r", 1);
telnet_prompt(connection);
telnet_load_history(telnet_connection);
log_add_callback(telnet_log_callback, connection);
return ERROR_OK;
}{ ... }
static void telnet_clear_line(struct connection *connection,
struct telnet_connection *t_con)
{
if (t_con->line_cursor < t_con->line_size)
telnet_write(connection,
t_con->line + t_con->line_cursor,
t_con->line_size - t_con->line_cursor);
while (t_con->line_size > 0) {
telnet_write(connection, "\b \b", 3);
t_con->line_size--;
}while (t_con->line_size > 0) { ... }
t_con->line_cursor = 0;
}{ ... }
static void telnet_history_go(struct connection *connection, int idx)
{
struct telnet_connection *t_con = connection->priv;
if (t_con->history[idx]) {
telnet_clear_line(connection, t_con);
t_con->line_size = strlen(t_con->history[idx]);
t_con->line_cursor = t_con->line_size;
memcpy(t_con->line, t_con->history[idx], t_con->line_size);
telnet_write(connection, t_con->line, t_con->line_size);
t_con->current_history = idx;
}if (t_con->history[idx]) { ... }
t_con->state = TELNET_STATE_DATA;
}{ ... }
static void telnet_history_up(struct connection *connection)
{
struct telnet_connection *t_con = connection->priv;
size_t last_history = (t_con->current_history > 0) ?
t_con->current_history - 1 :
TELNET_LINE_HISTORY_SIZE-1;
telnet_history_go(connection, last_history);
}{ ... }
static void telnet_history_down(struct connection *connection)
{
struct telnet_connection *t_con = connection->priv;
size_t next_history;
next_history = (t_con->current_history + 1) % TELNET_LINE_HISTORY_SIZE;
telnet_history_go(connection, next_history);
}{ ... }
static void telnet_history_add(struct connection *connection)
{
struct telnet_connection *t_con = connection->priv;
char *prev_line = t_con->history[(t_con->current_history > 0) ?
t_con->current_history - 1 : TELNET_LINE_HISTORY_SIZE-1];
if (*t_con->line && (!prev_line || strcmp(t_con->line, prev_line))) {
free(t_con->history[t_con->next_history]);
t_con->history[t_con->next_history] = strdup(t_con->line);
t_con->next_history = (t_con->next_history + 1) % TELNET_LINE_HISTORY_SIZE;
t_con->current_history = t_con->next_history;
free(t_con->history[t_con->current_history]);
t_con->history[t_con->current_history] = strdup("");
}if (*t_con->line && (!prev_line || strcmp(t_con->line, prev_line))) { ... }
}{ ... }
static int telnet_history_print(struct connection *connection)
{
struct telnet_connection *tc;
tc = connection->priv;
for (size_t i = 1; i < TELNET_LINE_HISTORY_SIZE; i++) {
char *line;
/* ... */
line = tc->history[(tc->next_history + i) % TELNET_LINE_HISTORY_SIZE];
if (line) {
telnet_write(connection, line, strlen(line));
telnet_write(connection, "\r\n\x00", 3);
}if (line) { ... }
}for (size_t i = 1; i < TELNET_LINE_HISTORY_SIZE; i++) { ... }
tc->line_size = 0;
tc->line_cursor = 0;
telnet_write(connection, "\r", 1);
return telnet_prompt(connection);
}{ ... }
static void telnet_move_cursor(struct connection *connection, size_t pos)
{
struct telnet_connection *tc = connection->priv;
size_t tmp;
if (pos == tc->line_cursor)
return;
if (pos > tc->line_size)
return;
if (pos < tc->line_cursor) {
tmp = tc->line_cursor - pos;
for (size_t i = 0; i < tmp; i += 16)
telnet_write(connection, "\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b",
MIN(tmp - i, 16));
}if (pos < tc->line_cursor) { ... } else {
tmp = pos - tc->line_cursor;
for (size_t i = 0; i < tmp; i += 16)
telnet_write(connection, tc->line + tc->line_cursor + i,
MIN(tmp - i, 16));
}else { ... }
tc->line_cursor = pos;
}{ ... }
static inline bool telnet_can_insert(struct connection *connection, size_t len)
{
struct telnet_connection *t_con = connection->priv;
return t_con->line_size + len < TELNET_LINE_MAX_SIZE;
}{ ... }
/* ... */
static bool telnet_insert(struct connection *connection, const void *data, size_t len)
{
struct telnet_connection *t_con = connection->priv;
if (!telnet_can_insert(connection, len)) {
telnet_bell(connection);
return false;
}if (!telnet_can_insert(connection, len)) { ... }
if (t_con->line_cursor < t_con->line_size) {
memmove(t_con->line + t_con->line_cursor + len,
t_con->line + t_con->line_cursor,
t_con->line_size - t_con->line_cursor);
}if (t_con->line_cursor < t_con->line_size) { ... }
strncpy(t_con->line + t_con->line_cursor, data, len);
telnet_write(connection,
t_con->line + t_con->line_cursor,
t_con->line_size + len - t_con->line_cursor);
t_con->line_size += len;
t_con->line_cursor += len;
for (size_t i = t_con->line_cursor; i < t_con->line_size; i++)
telnet_write(connection, "\b", 1);
return true;
}{ ... }
static void telnet_delete_character(struct connection *connection)
{
struct telnet_connection *t_con = connection->priv;
if (t_con->line_cursor == 0)
return;
if (t_con->line_cursor != t_con->line_size) {
size_t i;
telnet_write(connection, "\b", 1);
t_con->line_cursor--;
t_con->line_size--;
memmove(t_con->line + t_con->line_cursor,
t_con->line + t_con->line_cursor + 1,
t_con->line_size -
t_con->line_cursor);
telnet_write(connection,
t_con->line + t_con->line_cursor,
t_con->line_size -
t_con->line_cursor);
telnet_write(connection, " \b", 2);
for (i = t_con->line_cursor; i < t_con->line_size; i++)
telnet_write(connection, "\b", 1);
}if (t_con->line_cursor != t_con->line_size) { ... } else {
t_con->line_size--;
t_con->line_cursor--;
/* ... */
telnet_write(connection, "\b \b", 3);
}else { ... }
}{ ... }
static void telnet_remove_character(struct connection *connection)
{
struct telnet_connection *t_con = connection->priv;
if (t_con->line_cursor < t_con->line_size) {
size_t i;
t_con->line_size--;
memmove(t_con->line + t_con->line_cursor,
t_con->line + t_con->line_cursor + 1,
t_con->line_size - t_con->line_cursor);
telnet_write(connection, t_con->line + t_con->line_cursor,
t_con->line_size - t_con->line_cursor);
telnet_write(connection, " \b", 2);
for (i = t_con->line_cursor; i < t_con->line_size; i++)
telnet_write(connection, "\b", 1);
}if (t_con->line_cursor < t_con->line_size) { ... }
}{ ... }
static int telnet_exec_line(struct connection *connection)
{
struct telnet_connection *t_con = connection->priv;
struct command_context *command_context = connection->cmd_ctx;
int retval;
telnet_write(connection, "\r\n\x00", 3);
if (strcmp(t_con->line, "history") == 0) {
retval = telnet_history_print(connection);
if (retval != ERROR_OK)
return retval;
return ERROR_OK;
}if (strcmp(t_con->line, "history") == 0) { ... }
telnet_history_add(connection);
t_con->line_size = 0;
t_con->prompt_visible = false;
if (strcmp(t_con->line, "shutdown") == 0)
telnet_save_history(t_con);
retval = command_run_line(command_context, t_con->line);
t_con->line_cursor = 0;
t_con->prompt_visible = true;
if (retval == ERROR_COMMAND_CLOSE_CONNECTION)
return ERROR_SERVER_REMOTE_CLOSED;
telnet_write(connection, "\r", 1);
retval = telnet_prompt(connection);
if (retval == ERROR_SERVER_REMOTE_CLOSED)
return ERROR_SERVER_REMOTE_CLOSED;
return ERROR_OK;
}{ ... }
static void telnet_cut_line_to_end(struct connection *connection)
{
struct telnet_connection *t_con = connection->priv;
if (t_con->line_cursor < t_con->line_size) {
for (size_t i = t_con->line_cursor; i < t_con->line_size; i++)
telnet_write(connection, " ", 1);
for (size_t i = t_con->line_cursor; i < t_con->line_size; i++)
telnet_write(connection, "\b", 1);
t_con->line[t_con->line_cursor] = '\0';
t_con->line_size = t_con->line_cursor;
}if (t_con->line_cursor < t_con->line_size) { ... }
}{ ... }
static void telnet_interrupt(struct connection *connection)
{
struct telnet_connection *t_con = connection->priv;
telnet_move_cursor(connection, t_con->line_size);
telnet_write(connection, "^C\n\r", 4);
t_con->line_cursor = 0;
t_con->line_size = 0;
telnet_prompt(connection);
}{ ... }
static void telnet_auto_complete(struct connection *connection)
{
struct telnet_connection *t_con = connection->priv;
struct command_context *command_context = connection->cmd_ctx;
struct cmd_match {
char *cmd;
struct list_head lh;
...};
LIST_HEAD(matches);
/* ... */
bool is_variable_auto_completion = false;
bool have_spaces = false;
size_t seq_start = (t_con->line_cursor == 0) ? 0 : (t_con->line_cursor - 1);
while (1) {
char c = t_con->line[seq_start];
if (c == ';' || c == '[' || c == '{') {
seq_start++;
break;
}if (c == ';' || c == '[' || c == '{') { ... } else if (c == ' ') {
have_spaces = true;
}else if (c == ' ') { ... } else if (c == '$' && !have_spaces) {
is_variable_auto_completion = true;
seq_start++;
break;
}else if (c == '$' && !have_spaces) { ... }
if (seq_start == 0)
break;
seq_start--;
}while (1) { ... }
size_t usr_cmd_pos = seq_start;
while ((usr_cmd_pos < t_con->line_cursor) && isspace(t_con->line[usr_cmd_pos]))
usr_cmd_pos++;
if (t_con->line_cursor < usr_cmd_pos) {
telnet_bell(connection);
return;
}if (t_con->line_cursor < usr_cmd_pos) { ... }
size_t usr_cmd_len = t_con->line_cursor - usr_cmd_pos;
/* ... */
size_t optimized_spaces = 0;
char query[usr_cmd_len + 1];
for (size_t i = 0; i < usr_cmd_len; i++) {
if ((i < usr_cmd_len - 1) && isspace(t_con->line[usr_cmd_pos + i])
&& isspace(t_con->line[usr_cmd_pos + i + 1])) {
optimized_spaces++;
continue;
}if ((i < usr_cmd_len - 1) && isspace(t_con->line[usr_cmd_pos + i]) && isspace(t_con->line[usr_cmd_pos + i + 1])) { ... }
query[i - optimized_spaces] = t_con->line[usr_cmd_pos + i];
}for (size_t i = 0; i < usr_cmd_len; i++) { ... }
usr_cmd_len -= optimized_spaces;
query[usr_cmd_len] = '\0';
char *query_cmd;
if (is_variable_auto_completion)
query_cmd = alloc_printf("lsort [info vars {%s*}]", query);
else
query_cmd = alloc_printf("_telnet_autocomplete_helper {%s*}", query);
if (!query_cmd) {
LOG_ERROR("Out of memory");
return;
}if (!query_cmd) { ... }
int retval = Jim_EvalSource(command_context->interp, __FILE__, __LINE__, query_cmd);
free(query_cmd);
if (retval != JIM_OK)
return;
Jim_Obj *list = Jim_GetResult(command_context->interp);
Jim_IncrRefCount(list);
size_t common_len = 0;
char *first_match = NULL;
int len = Jim_ListLength(command_context->interp, list);
for (int i = 0; i < len; i++) {
Jim_Obj *elem = Jim_ListGetIndex(command_context->interp, list, i);
Jim_IncrRefCount(elem);
char *name = (char *)Jim_GetString(elem, NULL);
bool ignore_cmd = false;
if (!is_variable_auto_completion) {
Jim_Cmd *jim_cmd = Jim_GetCommand(command_context->interp, elem, JIM_NONE);
if (!jim_cmd) {
ignore_cmd = true;
}if (!jim_cmd) { ... } else if (jimcmd_is_oocd_command(jim_cmd)) {
struct command *cmd = jimcmd_privdata(jim_cmd);
if (cmd && !cmd->handler && !cmd->jim_handler) {
ignore_cmd = true;
}if (cmd && !cmd->handler && !cmd->jim_handler) { ... } else if (cmd && cmd->mode == COMMAND_CONFIG) {
ignore_cmd = true;
}else if (cmd && cmd->mode == COMMAND_CONFIG) { ... }
}else if (jimcmd_is_oocd_command(jim_cmd)) { ... }
}if (!is_variable_auto_completion) { ... }
if (!ignore_cmd) {
struct cmd_match *match = calloc(1, sizeof(struct cmd_match));
if (!match) {
LOG_ERROR("Out of memory");
Jim_DecrRefCount(command_context->interp, elem);
break;
}if (!match) { ... }
if (list_empty(&matches)) {
common_len = strlen(name);
first_match = name;
}if (list_empty(&matches)) { ... } else {
size_t new_common_len = usr_cmd_len;
while (new_common_len < common_len && first_match[new_common_len] == name[new_common_len])
new_common_len++;
common_len = new_common_len;
}else { ... }
match->cmd = name;
list_add_tail(&match->lh, &matches);
}if (!ignore_cmd) { ... }
Jim_DecrRefCount(command_context->interp, elem);
}for (int i = 0; i < len; i++) { ... }
if (list_empty(&matches))
telnet_bell(connection);
else if (common_len == usr_cmd_len && list_is_singular(&matches) && t_con->line_cursor == t_con->line_size)
telnet_insert(connection, " ", 1);
else if (common_len > usr_cmd_len) {
int completion_size = common_len - usr_cmd_len;
if (telnet_insert(connection, first_match + usr_cmd_len, completion_size)) {
if (list_is_singular(&matches) && t_con->line_cursor == t_con->line_size)
telnet_insert(connection, " ", 1);
}if (telnet_insert(connection, first_match + usr_cmd_len, completion_size)) { ... }
}else if (common_len > usr_cmd_len) { ... } else if (!list_is_singular(&matches)) {
telnet_write(connection, "\n\r", 2);
struct cmd_match *match;
list_for_each_entry(match, &matches, lh) {
telnet_write(connection, match->cmd, strlen(match->cmd));
telnet_write(connection, "\n\r", 2);
}list_for_each_entry (match, &matches, lh) { ... }
telnet_prompt(connection);
telnet_write(connection, t_con->line, t_con->line_size);
for (size_t i = t_con->line_cursor; i < t_con->line_size; i++)
telnet_write(connection, "\b", 1);
}else if (!list_is_singular(&matches)) { ... }
struct cmd_match *tmp, *match;
list_for_each_entry_safe(match, tmp, &matches, lh)
free(match);
Jim_DecrRefCount(command_context->interp, list);
}{ ... }
static int telnet_input(struct connection *connection)
{
int bytes_read;
unsigned char buffer[TELNET_BUFFER_SIZE];
unsigned char *buf_p;
struct telnet_connection *t_con = connection->priv;
bytes_read = connection_read(connection, buffer, TELNET_BUFFER_SIZE);
if (bytes_read == 0)
return ERROR_SERVER_REMOTE_CLOSED;
else if (bytes_read == -1) {
LOG_ERROR("error during read: %s", strerror(errno));
return ERROR_SERVER_REMOTE_CLOSED;
}else if (bytes_read == -1) { ... }
buf_p = buffer;
while (bytes_read) {
switch (t_con->state) {
case TELNET_STATE_DATA:
if (*buf_p == 0xff) {
t_con->state = TELNET_STATE_IAC;
}if (*buf_p == 0xff) { ... } else {
if (isprint(*buf_p)) {
telnet_insert(connection, buf_p, 1);
}if (isprint(*buf_p)) { ... } else {
if (*buf_p == 0x1b) {
t_con->state = TELNET_STATE_ESCAPE;
t_con->last_escape = '\x00';
}if (*buf_p == 0x1b) { ... } else if ((*buf_p == 0xd) || (*buf_p == 0xa)) {
int retval;
if ((bytes_read > 1) && ((*(buf_p + 1) == 0xa) ||
(*(buf_p + 1) == 0xd))) {
buf_p++;
bytes_read--;
}if ((bytes_read > 1) && ((*(buf_p + 1) == 0xa) || (*(buf_p + 1) == 0xd))) { ... }
if ((bytes_read > 1) && (*(buf_p + 1) == 0)) {
buf_p++;
bytes_read--;
}if ((bytes_read > 1) && (*(buf_p + 1) == 0)) { ... }
t_con->line[t_con->line_size] = 0;
retval = telnet_exec_line(connection);
if (retval != ERROR_OK)
return retval;
}else if ((*buf_p == 0xd) || (*buf_p == 0xa)) { ... } else if ((*buf_p == 0x7f) || (*buf_p == 0x8)) {
telnet_delete_character(connection);
}else if ((*buf_p == 0x7f) || (*buf_p == 0x8)) { ... } else if (*buf_p == 0x15) {
telnet_clear_line(connection, t_con);
}else if (*buf_p == 0x15) { ... } else if (*buf_p == CTRL('B')) {
telnet_move_cursor(connection, t_con->line_cursor - 1);
t_con->state = TELNET_STATE_DATA;
}else if (*buf_p == CTRL('B')) { ... } else if (*buf_p == CTRL('C')) {
telnet_interrupt(connection);
}else if (*buf_p == CTRL('C')) { ... } else if (*buf_p == CTRL('F')) {
telnet_move_cursor(connection, t_con->line_cursor + 1);
t_con->state = TELNET_STATE_DATA;
}else if (*buf_p == CTRL('F')) { ... } else if (*buf_p == CTRL('P')) {
telnet_history_up(connection);
}else if (*buf_p == CTRL('P')) { ... } else if (*buf_p == CTRL('N')) {
telnet_history_down(connection);
}else if (*buf_p == CTRL('N')) { ... } else if (*buf_p == CTRL('A')) {
telnet_move_cursor(connection, 0);
}else if (*buf_p == CTRL('A')) { ... } else if (*buf_p == CTRL('E')) {
telnet_move_cursor(connection, t_con->line_size);
}else if (*buf_p == CTRL('E')) { ... } else if (*buf_p == CTRL('K')) {
telnet_cut_line_to_end(connection);
}else if (*buf_p == CTRL('K')) { ... } else if (*buf_p == '\t') {
telnet_auto_complete(connection);
}else if (*buf_p == '\t') { ... } else {
LOG_DEBUG("unhandled nonprintable: %2.2x", *buf_p);
}else { ... }
}else { ... }
}else { ... }
break;case TELNET_STATE_DATA:
case TELNET_STATE_IAC:
switch (*buf_p) {
case 0xfe:
t_con->state = TELNET_STATE_DONT;
break;case 0xfe:
case 0xfd:
t_con->state = TELNET_STATE_DO;
break;case 0xfd:
case 0xfc:
t_con->state = TELNET_STATE_WONT;
break;case 0xfc:
case 0xfb:
t_con->state = TELNET_STATE_WILL;
break;case 0xfb:
}switch (*buf_p) { ... }
break;case TELNET_STATE_IAC:
case TELNET_STATE_SB:
break;case TELNET_STATE_SB:
case TELNET_STATE_SE:
break;case TELNET_STATE_SE:
case TELNET_STATE_WILL:
case TELNET_STATE_WONT:
case TELNET_STATE_DO:
case TELNET_STATE_DONT:
t_con->state = TELNET_STATE_DATA;
break;case TELNET_STATE_DONT:
case TELNET_STATE_ESCAPE:
if (t_con->last_escape == '[') {
if (*buf_p == 'D') {
telnet_move_cursor(connection, t_con->line_cursor - 1);
t_con->state = TELNET_STATE_DATA;
}if (*buf_p == 'D') { ... } else if (*buf_p == 'C') {
telnet_move_cursor(connection, t_con->line_cursor + 1);
t_con->state = TELNET_STATE_DATA;
}else if (*buf_p == 'C') { ... } else if (*buf_p == 'A') {
telnet_history_up(connection);
}else if (*buf_p == 'A') { ... } else if (*buf_p == 'B') {
telnet_history_down(connection);
}else if (*buf_p == 'B') { ... } else if (*buf_p == 'F') {
telnet_move_cursor(connection, t_con->line_size);
t_con->state = TELNET_STATE_DATA;
}else if (*buf_p == 'F') { ... } else if (*buf_p == 'H') {
telnet_move_cursor(connection, 0);
t_con->state = TELNET_STATE_DATA;
}else if (*buf_p == 'H') { ... } else if (*buf_p == '3') {
t_con->last_escape = *buf_p;
}else if (*buf_p == '3') { ... } else {
t_con->state = TELNET_STATE_DATA;
}else { ... }
}if (t_con->last_escape == '[') { ... } else if (t_con->last_escape == '3') {
if (*buf_p == '~') {
telnet_remove_character(connection);
t_con->state = TELNET_STATE_DATA;
}if (*buf_p == '~') { ... } else
t_con->state = TELNET_STATE_DATA;
}else if (t_con->last_escape == '3') { ... } else if (t_con->last_escape == '\x00') {
if (*buf_p == '[')
t_con->last_escape = *buf_p;
else
t_con->state = TELNET_STATE_DATA;
}else if (t_con->last_escape == '\x00') { ... } else {
LOG_ERROR("BUG: unexpected value in t_con->last_escape");
t_con->state = TELNET_STATE_DATA;
}else { ... }
break;case TELNET_STATE_ESCAPE:
default:
LOG_ERROR("unknown telnet state");
return ERROR_FAIL;default
}switch (t_con->state) { ... }
bytes_read--;
buf_p++;
}while (bytes_read) { ... }
return ERROR_OK;
}{ ... }
static int telnet_connection_closed(struct connection *connection)
{
struct telnet_connection *t_con = connection->priv;
int i;
log_remove_callback(telnet_log_callback, connection);
free(t_con->prompt);
t_con->prompt = NULL;
telnet_save_history(t_con);
for (i = 0; i < TELNET_LINE_HISTORY_SIZE; i++) {
free(t_con->history[i]);
t_con->history[i] = NULL;
}for (i = 0; i < TELNET_LINE_HISTORY_SIZE; i++) { ... }
delete_debug_msg_receiver(connection->cmd_ctx, NULL);
free(connection->priv);
connection->priv = NULL;
return ERROR_OK;
}{ ... }
static const struct service_driver telnet_service_driver = {
.name = "telnet",
.new_connection_during_keep_alive_handler = NULL,
.new_connection_handler = telnet_new_connection,
.input_handler = telnet_input,
.connection_closed_handler = telnet_connection_closed,
.keep_client_alive_handler = NULL,
...};
int telnet_init(char *banner)
{
if (strcmp(telnet_port, "disabled") == 0) {
LOG_INFO("telnet server disabled");
return ERROR_OK;
}if (strcmp(telnet_port, "disabled") == 0) { ... }
struct telnet_service *telnet_service =
malloc(sizeof(struct telnet_service));
if (!telnet_service) {
LOG_ERROR("Failed to allocate telnet service.");
return ERROR_FAIL;
}if (!telnet_service) { ... }
telnet_service->banner = banner;
int ret = add_service(&telnet_service_driver, telnet_port, CONNECTION_LIMIT_UNLIMITED,
telnet_service);
if (ret != ERROR_OK) {
free(telnet_service);
return ret;
}if (ret != ERROR_OK) { ... }
return ERROR_OK;
}{ ... }
COMMAND_HANDLER(handle_telnet_port_command)
{
return CALL_COMMAND_HANDLER(server_pipe_command, &telnet_port);
}{ ... }
COMMAND_HANDLER(handle_exit_command)
{
return ERROR_COMMAND_CLOSE_CONNECTION;
}{ ... }
static const struct command_registration telnet_command_handlers[] = {
{
.name = "exit",
.handler = handle_exit_command,
.mode = COMMAND_ANY,
.usage = "",
.help = "exit telnet session",
...},
{
.name = "telnet_port",
.handler = handle_telnet_port_command,
.mode = COMMAND_CONFIG,
.help = "Specify port on which to listen "
"for incoming telnet connections. "
"Read help on 'gdb port'.",
.usage = "[port_num]",
...},
COMMAND_REGISTRATION_DONE
...};
int telnet_register_commands(struct command_context *cmd_ctx)
{
telnet_port = strdup("4444");
return register_commands(cmd_ctx, NULL, telnet_command_handlers);
}{ ... }
void telnet_service_free(void)
{
free(telnet_port);
}{ ... }