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   1 /***************************************************************************\r
   2  *   Copyright (C) 2005 by Dominic Rath                                    *\r
   3  *   Dominic.Rath@gmx.de                                                   *\r
   4  *                                                                         *\r
   5  *   This program is free software; you can redistribute it and/or modify  *\r
   6  *   it under the terms of the GNU General Public License as published by  *\r
   7  *   the Free Software Foundation; either version 2 of the License, or     *\r
   8  *   (at your option) any later version.                                   *\r
   9  *                                                                         *\r
  10  *   This program is distributed in the hope that it will be useful,       *\r
  11  *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *\r
  12  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *\r
  13  *   GNU General Public License for more details.                          *\r
  14  *                                                                         *\r
  15  *   You should have received a copy of the GNU General Public License     *\r
  16  *   along with this program; if not, write to the                         *\r
  17  *   Free Software Foundation, Inc.,                                       *\r
  18  *   59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.             *\r
  19  ***************************************************************************/\r
  20 #ifdef HAVE_CONFIG_H\r
  21 #include "config.h"\r
  22 #endif\r
  23 \r
  24 #include "replacements.h"\r
  25 \r
  26 #include "telnet_server.h"\r
  27 \r
  28 #include "server.h"\r
  29 #include "log.h"\r
  30 #include "command.h"\r
  31 #include "target.h"\r
  32 #include "target_request.h"\r
  33 \r
  34 #include <stdlib.h>\r
  35 #include <unistd.h>\r
  36 #include <errno.h>\r
  37 #include <string.h>\r
  38 #include <ctype.h>\r
  39 \r
  40 static unsigned short telnet_port = 0;\r
  41 \r
  42 int handle_exit_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc);\r
  43 int handle_telnet_port_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc);\r
  44 \r
  45 static char *negotiate =\r
  46                 "\xFF\xFB\x03"          /* IAC WILL Suppress Go Ahead */\r
  47                 "\xFF\xFB\x01"          /* IAC WILL Echo */\r
  48                 "\xFF\xFD\x03"          /* IAC DO Suppress Go Ahead */\r
  49                 "\xFF\xFE\x01";         /* IAC DON'T Echo */\r
  50                 \r
  51 #define CTRL(c) (c - '@')\r
  52         \r
  53 /* The only way we can detect that the socket is closed is the first time\r
  54  * we write to it, we will fail. Subsequent write operations will\r
  55  * succeed. Shudder!\r
  56  */\r
  57 int telnet_write(connection_t *connection, void *data, int len)\r
  58 {\r
  59         telnet_connection_t *t_con = connection->priv;\r
  60         if (t_con->closed)\r
  61                 return ERROR_SERVER_REMOTE_CLOSED;\r
  62 \r
  63         if (write_socket(connection->fd, data, len) == len)\r
  64         {\r
  65                 return ERROR_OK;\r
  66         }\r
  67         t_con->closed = 1;\r
  68         return ERROR_SERVER_REMOTE_CLOSED;\r
  69 }\r
  70 \r
  71 int telnet_prompt(connection_t *connection)\r
  72 {\r
  73         telnet_connection_t *t_con = connection->priv;\r
  74 \r
  75         return telnet_write(connection, t_con->prompt, strlen(t_con->prompt));\r
  76 }\r
  77 \r
  78 int telnet_outputline(connection_t *connection, char* line)\r
  79 {\r
  80         telnet_write(connection, line, strlen(line));\r
  81         return telnet_write(connection, "\r\n\0", 3);\r
  82 }\r
  83 \r
  84 int telnet_output(struct command_context_s *cmd_ctx, char* line)\r
  85 {\r
  86         connection_t *connection = cmd_ctx->output_handler_priv;\r
  87         \r
  88         return telnet_outputline(connection, line);\r
  89 }\r
  90 \r
  91 void telnet_log_callback(void *priv, const char *file, int line, \r
  92                 const char *function, const char *format, va_list args)\r
  93 {\r
  94         connection_t *connection = priv;\r
  95         char *t = alloc_printf(format, args);\r
  96         char *t2;\r
  97         if (t == NULL)\r
  98                 return;\r
  99         t2=t;\r
 100         char *endline;\r
 101         do \r
 102         {\r
 103                 if ((endline=strchr(t2, '\n'))!=NULL)\r
 104                 {\r
 105                         *endline=0;\r
 106                 }\r
 107                 telnet_outputline(connection, t2);\r
 108                 t2=endline+1;\r
 109         } while (endline);\r
 110         \r
 111         free(t);\r
 112 }\r
 113 \r
 114 int telnet_target_callback_event_handler(struct target_s *target, enum target_event event, void *priv)\r
 115 {\r
 116         struct command_context_s *cmd_ctx = priv;\r
 117         connection_t *connection = cmd_ctx->output_handler_priv;\r
 118         telnet_connection_t *t_con = connection->priv;\r
 119         \r
 120         switch (event)\r
 121         {\r
 122                 case TARGET_EVENT_HALTED:\r
 123                         target_arch_state(target);\r
 124                         if (!t_con->suppress_prompt)\r
 125                                 telnet_prompt(connection);\r
 126                         break;\r
 127                 case TARGET_EVENT_RESUMED:\r
 128                         if (!t_con->suppress_prompt)\r
 129                                 telnet_prompt(connection);\r
 130                         break;\r
 131                 default:\r
 132                         break;\r
 133         }\r
 134 \r
 135         return ERROR_OK;\r
 136 }\r
 137 \r
 138 int telnet_new_connection(connection_t *connection)\r
 139 {\r
 140         telnet_connection_t *telnet_connection = malloc(sizeof(telnet_connection_t));\r
 141         telnet_service_t *telnet_service = connection->service->priv;\r
 142         int i;\r
 143         \r
 144         connection->priv = telnet_connection;\r
 145         \r
 146         /* initialize telnet connection information */\r
 147         telnet_connection->closed = 0;\r
 148         telnet_connection->line_size = 0;\r
 149         telnet_connection->line_cursor = 0;\r
 150         telnet_connection->option_size = 0;\r
 151         telnet_connection->prompt = strdup("> ");\r
 152         telnet_connection->suppress_prompt = 0;\r
 153         telnet_connection->state = TELNET_STATE_DATA;\r
 154         \r
 155         /* output goes through telnet connection */\r
 156         command_set_output_handler(connection->cmd_ctx, telnet_output, connection);\r
 157         \r
 158         /* negotiate telnet options */\r
 159         telnet_write(connection, negotiate, strlen(negotiate));\r
 160         \r
 161         /* print connection banner */\r
 162         if (telnet_service->banner)\r
 163         {\r
 164                 telnet_write(connection, telnet_service->banner, strlen(telnet_service->banner));\r
 165                 telnet_write(connection, "\r\n\0", 3);\r
 166         }\r
 167         \r
 168         telnet_prompt(connection);\r
 169         \r
 170         /* initialize history */\r
 171         for (i = 0; i < TELNET_LINE_HISTORY_SIZE; i++)\r
 172         {\r
 173                 telnet_connection->history[i] = NULL;\r
 174         }\r
 175         telnet_connection->next_history = 0;\r
 176         telnet_connection->current_history = 0;\r
 177 \r
 178         target_register_event_callback(telnet_target_callback_event_handler, connection->cmd_ctx);\r
 179         \r
 180         return ERROR_OK;\r
 181 }\r
 182 \r
 183 void telnet_clear_line(connection_t *connection, telnet_connection_t *t_con)\r
 184 {\r
 185         /* move to end of line */\r
 186         if (t_con->line_cursor < t_con->line_size)\r
 187         {\r
 188                 telnet_write(connection, t_con->line + t_con->line_cursor, t_con->line_size - t_con->line_cursor);\r
 189         }\r
 190                                                         \r
 191         /* backspace, overwrite with space, backspace */\r
 192         while (t_con->line_size > 0)\r
 193         {\r
 194                 telnet_write(connection, "\b \b", 3);\r
 195                 t_con->line_size--;\r
 196         }\r
 197         t_con->line_cursor = 0;\r
 198 }\r
 199 \r
 200 int telnet_input(connection_t *connection)\r
 201 {\r
 202         int bytes_read;\r
 203         char buffer[TELNET_BUFFER_SIZE];\r
 204         char *buf_p;\r
 205         telnet_connection_t *t_con = connection->priv;\r
 206         command_context_t *command_context = connection->cmd_ctx;\r
 207         \r
 208         bytes_read = read_socket(connection->fd, buffer, TELNET_BUFFER_SIZE);\r
 209         \r
 210         if (bytes_read == 0)\r
 211                 return ERROR_SERVER_REMOTE_CLOSED;\r
 212         else if (bytes_read == -1)\r
 213         {\r
 214                 ERROR("error during read: %s", strerror(errno));\r
 215                 return ERROR_SERVER_REMOTE_CLOSED;\r
 216         }\r
 217         \r
 218         buf_p = buffer;\r
 219         while (bytes_read)\r
 220         {\r
 221                 switch (t_con->state)\r
 222                 {\r
 223                         case TELNET_STATE_DATA:\r
 224                                 if (*buf_p == '\xff')\r
 225                                 {\r
 226                                         t_con->state = TELNET_STATE_IAC;\r
 227                                 }\r
 228                                 else\r
 229                                 {\r
 230                                         if (isprint(*buf_p)) /* printable character */\r
 231                                         {\r
 232                                                 telnet_write(connection, buf_p, 1);\r
 233                                                 if (t_con->line_cursor == t_con->line_size)\r
 234                                                 {\r
 235                                                         t_con->line[t_con->line_size++] = *buf_p;\r
 236                                                         t_con->line_cursor++;\r
 237                                                 }\r
 238                                                 else\r
 239                                                 {\r
 240                                                         int i;\r
 241                                                         memmove(t_con->line + t_con->line_cursor + 1, t_con->line + t_con->line_cursor, t_con->line_size - t_con->line_cursor);\r
 242                                                         t_con->line[t_con->line_cursor++] = *buf_p;\r
 243                                                         t_con->line_size++;\r
 244                                                         telnet_write(connection, t_con->line + t_con->line_cursor, t_con->line_size - t_con->line_cursor);\r
 245                                                         for (i = t_con->line_cursor; i < t_con->line_size; i++)\r
 246                                                         {\r
 247                                                                 telnet_write(connection, "\b", 1);\r
 248                                                         }\r
 249                                                 }\r
 250                                         }\r
 251                                         else /* non-printable */\r
 252                                         {\r
 253                                                 if (*buf_p == 0x1b) /* escape */\r
 254                                                 {\r
 255                                                         t_con->state = TELNET_STATE_ESCAPE;\r
 256                                                         t_con->last_escape = '\x00';\r
 257                                                 }\r
 258                                                 else if ((*buf_p == 0xd) || (*buf_p == 0xa)) /* CR/LF */\r
 259                                                 {\r
 260                                                         int retval;\r
 261                                                         \r
 262                                                         /* skip over combinations with CR/LF + NUL */\r
 263                                                         if (((*(buf_p + 1) == 0xa) || (*(buf_p + 1) == 0xd)) && (bytes_read > 1))\r
 264                                                         {\r
 265                                                                 buf_p++;\r
 266                                                                 bytes_read--;\r
 267                                                         }\r
 268                                                         if ((*(buf_p + 1) == 0) && (bytes_read > 1))\r
 269                                                         {\r
 270                                                                 buf_p++;\r
 271                                                                 bytes_read--;\r
 272                                                         }\r
 273                                                         t_con->line[t_con->line_size] = 0;\r
 274                                                         \r
 275                                                         telnet_write(connection, "\r\n\x00", 3);\r
 276                                                         \r
 277                                                         if (strcmp(t_con->line, "history") == 0)\r
 278                                                         {\r
 279                                                                 int i;\r
 280                                                                 for (i = 0; i < TELNET_LINE_HISTORY_SIZE; i++)\r
 281                                                                 {\r
 282                                                                         if (t_con->history[i])\r
 283                                                                         {\r
 284                                                                                 telnet_write(connection, t_con->history[i], strlen(t_con->history[i]));\r
 285                                                                                 telnet_write(connection, "\r\n\x00", 3);\r
 286                                                                         }\r
 287                                                                 }\r
 288                                                                 telnet_prompt(connection);\r
 289                                                                 t_con->line_size = 0;\r
 290                                                                 t_con->line_cursor = 0;\r
 291                                                                 continue;\r
 292                                                         }\r
 293                                                         \r
 294                                                         log_add_callback(telnet_log_callback, connection);\r
 295                                                         t_con->suppress_prompt = 1;\r
 296 \r
 297                                                         retval = command_run_line(command_context, t_con->line);\r
 298                                                         \r
 299                                                         log_remove_callback(telnet_log_callback, connection);\r
 300                                                         t_con->suppress_prompt = 0;\r
 301 \r
 302                                                         if (retval == ERROR_COMMAND_CLOSE_CONNECTION)\r
 303                                                         {\r
 304                                                                 return ERROR_SERVER_REMOTE_CLOSED;\r
 305                                                         }\r
 306                                                         \r
 307                                                         /* Save only non-blank lines in the history */\r
 308                                                         if (t_con->line_size > 0)\r
 309                                                         {\r
 310                                                                 /* if the history slot is already taken, free it */\r
 311                                                                 if (t_con->history[t_con->next_history])\r
 312                                                                 {\r
 313                                                                         free(t_con->history[t_con->next_history]);\r
 314                                                                 }\r
 315                 \r
 316                                                                 /* add line to history */\r
 317                                                                 t_con->history[t_con->next_history] = strdup(t_con->line);\r
 318 \r
 319                                                                 /* wrap history at TELNET_LINE_HISTORY_SIZE */\r
 320                                                                 t_con->next_history = (t_con->next_history + 1) % TELNET_LINE_HISTORY_SIZE;\r
 321                                                         \r
 322                                                                 /* current history line starts at the new entry */\r
 323                                                                 t_con->current_history = t_con->next_history;\r
 324                                                         \r
 325                                                                 if (t_con->history[t_con->current_history])\r
 326                                                                 {\r
 327                                                                         free(t_con->history[t_con->current_history]);\r
 328                                                                 }\r
 329                                                                 t_con->history[t_con->current_history] = strdup("");\r
 330                                                         }\r
 331                                                         \r
 332                                                         int t = telnet_prompt(connection);\r
 333                                                         if (t == ERROR_SERVER_REMOTE_CLOSED)\r
 334                                                                 return t;\r
 335                                                         \r
 336                                                         t_con->line_size = 0;\r
 337                                                         t_con->line_cursor = 0;\r
 338                                                 }\r
 339                                                 else if ((*buf_p == 0x7f) || (*buf_p == 0x8)) /* delete character */\r
 340                                                 {\r
 341                                                         if (t_con->line_cursor > 0)\r
 342                                                         {\r
 343                                                                 if (t_con->line_cursor != t_con->line_size)\r
 344                                                                 {\r
 345                                                                         int i;\r
 346                                                                         telnet_write(connection, "\b", 1);\r
 347                                                                         t_con->line_cursor--;\r
 348                                                                         t_con->line_size--;\r
 349                                                                         memmove(t_con->line + t_con->line_cursor, t_con->line + t_con->line_cursor + 1, t_con->line_size - t_con->line_cursor);\r
 350                                                                         \r
 351                                                                         telnet_write(connection, t_con->line + t_con->line_cursor, t_con->line_size - t_con->line_cursor);\r
 352                                                                         telnet_write(connection, " \b", 2);\r
 353                                                                         for (i = t_con->line_cursor; i < t_con->line_size; i++)\r
 354                                                                         {\r
 355                                                                                 telnet_write(connection, "\b", 1);\r
 356                                                                         }\r
 357                                                                 }\r
 358                                                                 else\r
 359                                                                 {\r
 360                                                                         t_con->line_size--;\r
 361                                                                         t_con->line_cursor--;\r
 362                                                                         /* back space: move the 'printer' head one char back, overwrite with space, move back again */\r
 363                                                                         telnet_write(connection, "\b \b", 3);\r
 364                                                                 }\r
 365                                                         }\r
 366                                                 }\r
 367                                                 else if (*buf_p == 0x15) /* clear line */\r
 368                                                 {\r
 369                                                         telnet_clear_line(connection, t_con);\r
 370                                                 }\r
 371                                                 else if (*buf_p == CTRL('B')) /* cursor left */\r
 372                                                 {\r
 373                                                         if (t_con->line_cursor > 0)\r
 374                                                         {\r
 375                                                                 telnet_write(connection, "\b", 1);\r
 376                                                                 t_con->line_cursor--;\r
 377                                                         }\r
 378                                                         t_con->state = TELNET_STATE_DATA;\r
 379                                                 }\r
 380                                                 else if (*buf_p == CTRL('F')) /* cursor right */\r
 381                                                 {\r
 382                                                         if (t_con->line_cursor < t_con->line_size)\r
 383                                                         {\r
 384                                                                 telnet_write(connection, t_con->line + t_con->line_cursor++, 1);\r
 385                                                         }\r
 386                                                         t_con->state = TELNET_STATE_DATA;\r
 387                                                 }\r
 388                                                 else\r
 389                                                 {\r
 390                                                         DEBUG("unhandled nonprintable: %2.2x", *buf_p);\r
 391                                                 }\r
 392                                         }\r
 393                                 }\r
 394                                 break;\r
 395                         case TELNET_STATE_IAC:\r
 396                                 switch (*buf_p)\r
 397                                 {\r
 398                                         case '\xfe':\r
 399                                                 t_con->state = TELNET_STATE_DONT;\r
 400                                                 break;\r
 401                                         case '\xfd':\r
 402                                                 t_con->state = TELNET_STATE_DO;\r
 403                                                 break;\r
 404                                         case '\xfc':\r
 405                                                 t_con->state = TELNET_STATE_WONT;\r
 406                                                 break;\r
 407                                         case '\xfb':\r
 408                                                 t_con->state = TELNET_STATE_WILL;\r
 409                                                 break;\r
 410                                 }\r
 411                                 break;\r
 412                         case TELNET_STATE_SB:\r
 413                                 break;\r
 414                         case TELNET_STATE_SE:\r
 415                                 break;\r
 416                         case TELNET_STATE_WILL:\r
 417                         case TELNET_STATE_WONT:\r
 418                         case TELNET_STATE_DO:\r
 419                         case TELNET_STATE_DONT:\r
 420                                 t_con->state = TELNET_STATE_DATA;\r
 421                                 break;\r
 422                         case TELNET_STATE_ESCAPE:\r
 423                                 if (t_con->last_escape == '[')\r
 424                                 {\r
 425                                         if (*buf_p == 'D') /* cursor left */\r
 426                                         {\r
 427                                                 if (t_con->line_cursor > 0)\r
 428                                                 {\r
 429                                                         telnet_write(connection, "\b", 1);\r
 430                                                         t_con->line_cursor--;\r
 431                                                 }\r
 432                                                 t_con->state = TELNET_STATE_DATA;\r
 433                                         }\r
 434                                         else if (*buf_p == 'C') /* cursor right */\r
 435                                         {\r
 436                                                 if (t_con->line_cursor < t_con->line_size)\r
 437                                                 {\r
 438                                                         telnet_write(connection, t_con->line + t_con->line_cursor++, 1);\r
 439                                                 }\r
 440                                                 t_con->state = TELNET_STATE_DATA;\r
 441                                         }\r
 442                                         else if (*buf_p == 'A') /* cursor up */\r
 443                                         {\r
 444                                                 int last_history = (t_con->current_history > 0) ? t_con->current_history - 1 : TELNET_LINE_HISTORY_SIZE-1;\r
 445                                                 if (t_con->history[last_history])\r
 446                                                 {\r
 447                                                         telnet_clear_line(connection, t_con);\r
 448                                                         t_con->line_size = strlen(t_con->history[last_history]);\r
 449                                                         t_con->line_cursor = t_con->line_size;\r
 450                                                         memcpy(t_con->line, t_con->history[last_history], t_con->line_size + 1);\r
 451                                                         telnet_write(connection, t_con->line, t_con->line_size);\r
 452                                                         t_con->current_history = last_history;\r
 453                                                 }\r
 454                                                 t_con->state = TELNET_STATE_DATA;\r
 455                                         }\r
 456                                         else if (*buf_p == 'B') /* cursor down */\r
 457                                         {\r
 458                                                 int next_history = (t_con->current_history + 1) % TELNET_LINE_HISTORY_SIZE;\r
 459                                                 if (t_con->history[next_history])\r
 460                                                 {\r
 461                                                         telnet_clear_line(connection, t_con);\r
 462                                                         t_con->line_size = strlen(t_con->history[next_history]);\r
 463                                                         t_con->line_cursor = t_con->line_size;\r
 464                                                         memcpy(t_con->line, t_con->history[next_history], t_con->line_size + 1);\r
 465                                                         telnet_write(connection, t_con->line, t_con->line_size);\r
 466                                                         t_con->current_history = next_history;\r
 467                                                 }\r
 468                                                 t_con->state = TELNET_STATE_DATA;\r
 469                                         }\r
 470                                         else if (*buf_p == '3')\r
 471                                         {\r
 472                                                 t_con->last_escape = *buf_p;\r
 473                                         }\r
 474                                         else\r
 475                                         {\r
 476                                                 t_con->state = TELNET_STATE_DATA;\r
 477                                         }\r
 478                                 }\r
 479                                 else if (t_con->last_escape == '3')\r
 480                                 {\r
 481                                         /* Remove character */\r
 482                                         if (*buf_p == '~')\r
 483                                         {\r
 484                                                 if (t_con->line_cursor < t_con->line_size)\r
 485                                                 {\r
 486                                                         int i;\r
 487                                                         t_con->line_size--;\r
 488                                                         /* remove char from line buffer */\r
 489                                                         memmove(t_con->line + t_con->line_cursor, t_con->line + t_con->line_cursor + 1, t_con->line_size - t_con->line_cursor);\r
 490                                                         \r
 491                                                         /* print remainder of buffer */\r
 492                                                         telnet_write(connection, t_con->line + t_con->line_cursor, t_con->line_size - t_con->line_cursor);\r
 493                                                         /* overwrite last char with whitespace */\r
 494                                                         telnet_write(connection, " \b", 2);\r
 495                                                         \r
 496                                                         /* move back to cursor position*/\r
 497                                                         for (i = t_con->line_cursor; i < t_con->line_size; i++)\r
 498                                                         {\r
 499                                                                 telnet_write(connection, "\b", 1);\r
 500                                                         }\r
 501                                                 }\r
 502                                                         \r
 503                                                 t_con->state = TELNET_STATE_DATA;\r
 504                                         }\r
 505                                         else\r
 506                                         {\r
 507                                                 t_con->state = TELNET_STATE_DATA;\r
 508                                         }\r
 509                                 }\r
 510                                 else if (t_con->last_escape == '\x00')\r
 511                                 {\r
 512                                         if (*buf_p == '[')\r
 513                                         {\r
 514                                                 t_con->last_escape = *buf_p;\r
 515                                         }\r
 516                                         else\r
 517                                         {\r
 518                                                 t_con->state = TELNET_STATE_DATA;\r
 519                                         }\r
 520                                 }\r
 521                                 else\r
 522                                 {\r
 523                                         ERROR("BUG: unexpected value in t_con->last_escape");\r
 524                                         t_con->state = TELNET_STATE_DATA;\r
 525                                 }\r
 526                                 \r
 527                                 break;\r
 528                         default:\r
 529                                 ERROR("unknown telnet state");\r
 530                                 exit(-1);\r
 531                 }\r
 532 \r
 533                 bytes_read--;\r
 534                 buf_p++;\r
 535         }\r
 536         \r
 537         return ERROR_OK;\r
 538 }\r
 539 \r
 540 int telnet_connection_closed(connection_t *connection)\r
 541 {\r
 542         telnet_connection_t *t_con = connection->priv;\r
 543         int i;\r
 544         \r
 545         if (t_con->prompt)\r
 546         {\r
 547                 free(t_con->prompt);\r
 548                 t_con->prompt = NULL;\r
 549         }\r
 550         \r
 551         for (i = 0; i < TELNET_LINE_HISTORY_SIZE; i++)\r
 552         {\r
 553                 if (t_con->history[i])\r
 554                 {\r
 555                         free(t_con->history[i]);\r
 556                         t_con->history[i] = NULL;\r
 557                 }\r
 558         }\r
 559         \r
 560         /* if this connection registered a debug-message receiver delete it */\r
 561         delete_debug_msg_receiver(connection->cmd_ctx, NULL);\r
 562         \r
 563         if (connection->priv)\r
 564         {\r
 565                 free(connection->priv);\r
 566                 connection->priv = NULL;\r
 567         }\r
 568         else\r
 569         {\r
 570                 ERROR("BUG: connection->priv == NULL");\r
 571         }\r
 572         \r
 573         target_unregister_event_callback(telnet_target_callback_event_handler, connection->cmd_ctx);\r
 574 \r
 575         return ERROR_OK;\r
 576 }\r
 577 \r
 578 int telnet_set_prompt(connection_t *connection, char *prompt)\r
 579 {\r
 580         telnet_connection_t *t_con = connection->priv;\r
 581 \r
 582         t_con->prompt = strdup(prompt);\r
 583         \r
 584         return ERROR_OK;\r
 585 }\r
 586 \r
 587 int telnet_init(char *banner)\r
 588 {\r
 589         telnet_service_t *telnet_service = malloc(sizeof(telnet_service_t));\r
 590         \r
 591         if (telnet_port == 0)\r
 592         {\r
 593                 WARNING("no telnet port specified, using default port 4444");\r
 594                 telnet_port = 4444;\r
 595         }\r
 596         \r
 597         telnet_service->banner = banner;\r
 598         \r
 599         add_service("telnet", CONNECTION_TELNET, telnet_port, 1, telnet_new_connection, telnet_input, telnet_connection_closed, telnet_service);\r
 600         \r
 601         return ERROR_OK;\r
 602 }\r
 603 \r
 604 int telnet_register_commands(command_context_t *command_context)\r
 605 {\r
 606         register_command(command_context, NULL, "exit", handle_exit_command,\r
 607                                          COMMAND_EXEC, "exit telnet session");\r
 608         \r
 609         register_command(command_context, NULL, "telnet_port", handle_telnet_port_command,\r
 610                                          COMMAND_CONFIG, "");\r
 611         \r
 612         return ERROR_OK;\r
 613 }\r
 614 \r
 615 /* daemon configuration command telnet_port */\r
 616 int handle_telnet_port_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc)\r
 617 {\r
 618         if (argc == 0)\r
 619                 return ERROR_OK;\r
 620 \r
 621         /* only if the port wasn't overwritten by cmdline */\r
 622         if (telnet_port == 0)\r
 623                 telnet_port = strtoul(args[0], NULL, 0);\r
 624 \r
 625         return ERROR_OK;\r
 626 }\r
 627 \r
 628 int handle_exit_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc)\r
 629 {\r
 630         return ERROR_COMMAND_CLOSE_CONNECTION;\r
 631 }\r