1 /***************************************************************************
2 * Copyright (C) 2005 by Dominic Rath *
3 * Dominic.Rath@gmx.de *
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. *
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. *
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 ***************************************************************************/
24 #include "replacements.h"
26 #include "telnet_server.h"
32 #include "target_request.h"
40 static unsigned short telnet_port
= 0;
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
);
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 */
51 #define CTRL(c) (c - '@')
53 /* The only way we can detect that the socket is closed is the first time
54 * we write to it, we will fail. Subsequent write operations will
57 int telnet_write(connection_t
*connection
, void *data
, int len
)
59 telnet_connection_t
*t_con
= connection
->priv
;
61 return ERROR_SERVER_REMOTE_CLOSED
;
63 if (write_socket(connection
->fd
, data
, len
) == len
)
68 return ERROR_SERVER_REMOTE_CLOSED
;
71 int telnet_prompt(connection_t
*connection
)
73 telnet_connection_t
*t_con
= connection
->priv
;
75 return telnet_write(connection
, t_con
->prompt
, strlen(t_con
->prompt
));
78 int telnet_outputline(connection_t
*connection
, char* line
)
80 telnet_write(connection
, line
, strlen(line
));
81 return telnet_write(connection
, "\r\n\0", 3);
84 int telnet_output(struct command_context_s
*cmd_ctx
, char* line
)
86 connection_t
*connection
= cmd_ctx
->output_handler_priv
;
88 return telnet_outputline(connection
, line
);
91 void telnet_log_callback(void *priv
, const char *file
, int line
,
92 const char *function
, const char *format
, va_list args
)
94 connection_t
*connection
= priv
;
95 char *t
= allocPrintf(format
, args
);
99 telnet_outputline(connection
, t
);
104 int telnet_target_callback_event_handler(struct target_s
*target
, enum target_event event
, void *priv
)
106 struct command_context_s
*cmd_ctx
= priv
;
107 connection_t
*connection
= cmd_ctx
->output_handler_priv
;
108 telnet_connection_t
*t_con
= connection
->priv
;
113 case TARGET_EVENT_HALTED
:
114 command_print(cmd_ctx
, "Target %i halted", get_num_by_target(target
));
115 target
->type
->arch_state(target
, buffer
, 512);
117 command_print(cmd_ctx
, "%s", buffer
);
118 if (!t_con
->suppress_prompt
)
119 telnet_prompt(connection
);
121 case TARGET_EVENT_RESUMED
:
122 command_print(cmd_ctx
, "Target %i resumed", get_num_by_target(target
));
123 if (!t_con
->suppress_prompt
)
124 telnet_prompt(connection
);
133 int telnet_new_connection(connection_t
*connection
)
135 telnet_connection_t
*telnet_connection
= malloc(sizeof(telnet_connection_t
));
136 telnet_service_t
*telnet_service
= connection
->service
->priv
;
139 connection
->priv
= telnet_connection
;
141 /* initialize telnet connection information */
142 telnet_connection
->closed
= 0;
143 telnet_connection
->line_size
= 0;
144 telnet_connection
->line_cursor
= 0;
145 telnet_connection
->option_size
= 0;
146 telnet_connection
->prompt
= strdup("> ");
147 telnet_connection
->suppress_prompt
= 0;
148 telnet_connection
->state
= TELNET_STATE_DATA
;
150 /* output goes through telnet connection */
151 command_set_output_handler(connection
->cmd_ctx
, telnet_output
, connection
);
153 /* negotiate telnet options */
154 telnet_write(connection
, negotiate
, strlen(negotiate
));
156 /* print connection banner */
157 if (telnet_service
->banner
)
159 telnet_write(connection
, telnet_service
->banner
, strlen(telnet_service
->banner
));
160 telnet_write(connection
, "\r\n\0", 3);
163 telnet_prompt(connection
);
165 /* initialize history */
166 for (i
= 0; i
< TELNET_LINE_HISTORY_SIZE
; i
++)
168 telnet_connection
->history
[i
] = NULL
;
170 telnet_connection
->next_history
= 0;
171 telnet_connection
->current_history
= 0;
173 target_register_event_callback(telnet_target_callback_event_handler
, connection
->cmd_ctx
);
178 void telnet_clear_line(connection_t
*connection
, telnet_connection_t
*t_con
)
180 /* move to end of line */
181 if (t_con
->line_cursor
< t_con
->line_size
)
183 telnet_write(connection
, t_con
->line
+ t_con
->line_cursor
, t_con
->line_size
- t_con
->line_cursor
);
186 /* backspace, overwrite with space, backspace */
187 while (t_con
->line_size
> 0)
189 telnet_write(connection
, "\b \b", 3);
192 t_con
->line_cursor
= 0;
195 int telnet_input(connection_t
*connection
)
198 char buffer
[TELNET_BUFFER_SIZE
];
200 telnet_connection_t
*t_con
= connection
->priv
;
201 command_context_t
*command_context
= connection
->cmd_ctx
;
203 bytes_read
= read_socket(connection
->fd
, buffer
, TELNET_BUFFER_SIZE
);
206 return ERROR_SERVER_REMOTE_CLOSED
;
207 else if (bytes_read
== -1)
209 ERROR("error during read: %s", strerror(errno
));
210 return ERROR_SERVER_REMOTE_CLOSED
;
216 switch (t_con
->state
)
218 case TELNET_STATE_DATA
:
219 if (*buf_p
== '\xff')
221 t_con
->state
= TELNET_STATE_IAC
;
225 if (isprint(*buf_p
)) /* printable character */
227 telnet_write(connection
, buf_p
, 1);
228 if (t_con
->line_cursor
== t_con
->line_size
)
230 t_con
->line
[t_con
->line_size
++] = *buf_p
;
231 t_con
->line_cursor
++;
236 memmove(t_con
->line
+ t_con
->line_cursor
+ 1, t_con
->line
+ t_con
->line_cursor
, t_con
->line_size
- t_con
->line_cursor
);
237 t_con
->line
[t_con
->line_cursor
++] = *buf_p
;
239 telnet_write(connection
, t_con
->line
+ t_con
->line_cursor
, t_con
->line_size
- t_con
->line_cursor
);
240 for (i
= t_con
->line_cursor
; i
< t_con
->line_size
; i
++)
242 telnet_write(connection
, "\b", 1);
246 else /* non-printable */
248 if (*buf_p
== 0x1b) /* escape */
250 t_con
->state
= TELNET_STATE_ESCAPE
;
251 t_con
->last_escape
= '\x00';
253 else if ((*buf_p
== 0xd) || (*buf_p
== 0xa)) /* CR/LF */
257 /* skip over combinations with CR/LF + NUL */
258 if (((*(buf_p
+ 1) == 0xa) || (*(buf_p
+ 1) == 0xd)) && (bytes_read
> 1))
263 if ((*(buf_p
+ 1) == 0) && (bytes_read
> 1))
268 t_con
->line
[t_con
->line_size
] = 0;
270 telnet_write(connection
, "\r\n\x00", 3);
272 if (strcmp(t_con
->line
, "history") == 0)
275 for (i
= 0; i
< TELNET_LINE_HISTORY_SIZE
; i
++)
277 if (t_con
->history
[i
])
279 telnet_write(connection
, t_con
->history
[i
], strlen(t_con
->history
[i
]));
280 telnet_write(connection
, "\r\n\x00", 3);
283 telnet_prompt(connection
);
284 t_con
->line_size
= 0;
285 t_con
->line_cursor
= 0;
289 log_setCallback(telnet_log_callback
, connection
);
290 t_con
->suppress_prompt
= 1;
292 if ((retval
= command_run_line(command_context
, t_con
->line
)) != ERROR_OK
)
294 if (retval
== ERROR_COMMAND_CLOSE_CONNECTION
)
296 return ERROR_SERVER_REMOTE_CLOSED
;
300 t_con
->suppress_prompt
= 0;
302 /* Save only non-blank lines in the history */
303 if (t_con
->line_size
> 0)
305 /* if the history slot is already taken, free it */
306 if (t_con
->history
[t_con
->next_history
])
308 free(t_con
->history
[t_con
->next_history
]);
311 /* add line to history */
312 t_con
->history
[t_con
->next_history
] = strdup(t_con
->line
);
314 /* wrap history at TELNET_LINE_HISTORY_SIZE */
315 t_con
->next_history
= (t_con
->next_history
+ 1) % TELNET_LINE_HISTORY_SIZE
;
317 /* current history line starts at the new entry */
318 t_con
->current_history
= t_con
->next_history
;
320 if (t_con
->history
[t_con
->current_history
])
322 free(t_con
->history
[t_con
->current_history
]);
324 t_con
->history
[t_con
->current_history
] = strdup("");
327 int t
= telnet_prompt(connection
);
328 if (t
== ERROR_SERVER_REMOTE_CLOSED
)
331 t_con
->line_size
= 0;
332 t_con
->line_cursor
= 0;
334 else if ((*buf_p
== 0x7f) || (*buf_p
== 0x8)) /* delete character */
336 if (t_con
->line_cursor
> 0)
338 if (t_con
->line_cursor
!= t_con
->line_size
)
341 telnet_write(connection
, "\b", 1);
342 t_con
->line_cursor
--;
344 memmove(t_con
->line
+ t_con
->line_cursor
, t_con
->line
+ t_con
->line_cursor
+ 1, t_con
->line_size
- t_con
->line_cursor
);
346 telnet_write(connection
, t_con
->line
+ t_con
->line_cursor
, t_con
->line_size
- t_con
->line_cursor
);
347 telnet_write(connection
, " \b", 2);
348 for (i
= t_con
->line_cursor
; i
< t_con
->line_size
; i
++)
350 telnet_write(connection
, "\b", 1);
356 t_con
->line_cursor
--;
357 /* back space: move the 'printer' head one char back, overwrite with space, move back again */
358 telnet_write(connection
, "\b \b", 3);
362 else if (*buf_p
== 0x15) /* clear line */
364 telnet_clear_line(connection
, t_con
);
366 else if (*buf_p
== CTRL('B')) /* cursor left */
368 if (t_con
->line_cursor
> 0)
370 telnet_write(connection
, "\b", 1);
371 t_con
->line_cursor
--;
373 t_con
->state
= TELNET_STATE_DATA
;
375 else if (*buf_p
== CTRL('F')) /* cursor right */
377 if (t_con
->line_cursor
< t_con
->line_size
)
379 telnet_write(connection
, t_con
->line
+ t_con
->line_cursor
++, 1);
381 t_con
->state
= TELNET_STATE_DATA
;
385 DEBUG("unhandled nonprintable: %2.2x", *buf_p
);
390 case TELNET_STATE_IAC
:
394 t_con
->state
= TELNET_STATE_DONT
;
397 t_con
->state
= TELNET_STATE_DO
;
400 t_con
->state
= TELNET_STATE_WONT
;
403 t_con
->state
= TELNET_STATE_WILL
;
407 case TELNET_STATE_SB
:
409 case TELNET_STATE_SE
:
411 case TELNET_STATE_WILL
:
412 case TELNET_STATE_WONT
:
413 case TELNET_STATE_DO
:
414 case TELNET_STATE_DONT
:
415 t_con
->state
= TELNET_STATE_DATA
;
417 case TELNET_STATE_ESCAPE
:
418 if (t_con
->last_escape
== '[')
420 if (*buf_p
== 'D') /* cursor left */
422 if (t_con
->line_cursor
> 0)
424 telnet_write(connection
, "\b", 1);
425 t_con
->line_cursor
--;
427 t_con
->state
= TELNET_STATE_DATA
;
429 else if (*buf_p
== 'C') /* cursor right */
431 if (t_con
->line_cursor
< t_con
->line_size
)
433 telnet_write(connection
, t_con
->line
+ t_con
->line_cursor
++, 1);
435 t_con
->state
= TELNET_STATE_DATA
;
437 else if (*buf_p
== 'A') /* cursor up */
439 int last_history
= (t_con
->current_history
> 0) ? t_con
->current_history
- 1 : TELNET_LINE_HISTORY_SIZE
-1;
440 if (t_con
->history
[last_history
])
442 telnet_clear_line(connection
, t_con
);
443 t_con
->line_size
= strlen(t_con
->history
[last_history
]);
444 t_con
->line_cursor
= t_con
->line_size
;
445 memcpy(t_con
->line
, t_con
->history
[last_history
], t_con
->line_size
+ 1);
446 telnet_write(connection
, t_con
->line
, t_con
->line_size
);
447 t_con
->current_history
= last_history
;
449 t_con
->state
= TELNET_STATE_DATA
;
451 else if (*buf_p
== 'B') /* cursor down */
453 int next_history
= (t_con
->current_history
+ 1) % TELNET_LINE_HISTORY_SIZE
;
454 if (t_con
->history
[next_history
])
456 telnet_clear_line(connection
, t_con
);
457 t_con
->line_size
= strlen(t_con
->history
[next_history
]);
458 t_con
->line_cursor
= t_con
->line_size
;
459 memcpy(t_con
->line
, t_con
->history
[next_history
], t_con
->line_size
+ 1);
460 telnet_write(connection
, t_con
->line
, t_con
->line_size
);
461 t_con
->current_history
= next_history
;
463 t_con
->state
= TELNET_STATE_DATA
;
465 else if (*buf_p
== '3')
467 t_con
->last_escape
= *buf_p
;
471 t_con
->state
= TELNET_STATE_DATA
;
474 else if (t_con
->last_escape
== '3')
476 /* Remove character */
479 if (t_con
->line_cursor
< t_con
->line_size
)
483 /* remove char from line buffer */
484 memmove(t_con
->line
+ t_con
->line_cursor
, t_con
->line
+ t_con
->line_cursor
+ 1, t_con
->line_size
- t_con
->line_cursor
);
486 /* print remainder of buffer */
487 telnet_write(connection
, t_con
->line
+ t_con
->line_cursor
, t_con
->line_size
- t_con
->line_cursor
);
488 /* overwrite last char with whitespace */
489 telnet_write(connection
, " \b", 2);
491 /* move back to cursor position*/
492 for (i
= t_con
->line_cursor
; i
< t_con
->line_size
; i
++)
494 telnet_write(connection
, "\b", 1);
498 t_con
->state
= TELNET_STATE_DATA
;
502 t_con
->state
= TELNET_STATE_DATA
;
505 else if (t_con
->last_escape
== '\x00')
509 t_con
->last_escape
= *buf_p
;
513 t_con
->state
= TELNET_STATE_DATA
;
518 ERROR("BUG: unexpected value in t_con->last_escape");
519 t_con
->state
= TELNET_STATE_DATA
;
524 ERROR("unknown telnet state");
535 int telnet_connection_closed(connection_t
*connection
)
537 telnet_connection_t
*t_con
= connection
->priv
;
543 t_con
->prompt
= NULL
;
546 for (i
= 0; i
< TELNET_LINE_HISTORY_SIZE
; i
++)
548 if (t_con
->history
[i
])
550 free(t_con
->history
[i
]);
551 t_con
->history
[i
] = NULL
;
555 /* if this connection registered a debug-message receiver delete it */
556 delete_debug_msg_receiver(connection
->cmd_ctx
, NULL
);
558 if (connection
->priv
)
560 free(connection
->priv
);
561 connection
->priv
= NULL
;
565 ERROR("BUG: connection->priv == NULL");
568 target_unregister_event_callback(telnet_target_callback_event_handler
, connection
->cmd_ctx
);
573 int telnet_set_prompt(connection_t
*connection
, char *prompt
)
575 telnet_connection_t
*t_con
= connection
->priv
;
577 t_con
->prompt
= strdup(prompt
);
582 int telnet_init(char *banner
)
584 telnet_service_t
*telnet_service
= malloc(sizeof(telnet_service_t
));
586 if (telnet_port
== 0)
588 WARNING("no telnet port specified, using default port 4444");
592 telnet_service
->banner
= banner
;
594 add_service("telnet", CONNECTION_TELNET
, telnet_port
, 1, telnet_new_connection
, telnet_input
, telnet_connection_closed
, telnet_service
);
599 int telnet_register_commands(command_context_t
*command_context
)
601 register_command(command_context
, NULL
, "exit", handle_exit_command
,
602 COMMAND_EXEC
, "exit telnet session");
604 register_command(command_context
, NULL
, "telnet_port", handle_telnet_port_command
,
610 /* daemon configuration command telnet_port */
611 int handle_telnet_port_command(struct command_context_s
*cmd_ctx
, char *cmd
, char **args
, int argc
)
616 /* only if the port wasn't overwritten by cmdline */
617 if (telnet_port
== 0)
618 telnet_port
= strtoul(args
[0], NULL
, 0);
623 int handle_exit_command(struct command_context_s
*cmd_ctx
, char *cmd
, char **args
, int argc
)
625 return ERROR_COMMAND_CLOSE_CONNECTION
;
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