|
- /***************************************************************************
- * Copyright (C) 2005 by Dominic Rath *
- * Dominic.Rath@gmx.de *
- * *
- * Copyright (C) 2007-2010 Øyvind Harboe *
- * oyvind.harboe@zylin.com *
- * *
- * Copyright (C) 2008 by Spencer Oliver *
- * spen@spen-soft.co.uk *
- * *
- * This program is free software; you can redistribute it and/or modify *
- * it under the terms of the GNU General Public License as published by *
- * the Free Software Foundation; either version 2 of the License, or *
- * (at your option) any later version. *
- * *
- * This program is distributed in the hope that it will be useful, *
- * but WITHOUT ANY WARRANTY; without even the implied warranty of *
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
- * GNU General Public License for more details. *
- * *
- * You should have received a copy of the GNU General Public License *
- * along with this program. If not, see <http://www.gnu.org/licenses/>. *
- ***************************************************************************/
-
- #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" /* IAC WILL Suppress Go Ahead */
- "\xFF\xFB\x01" /* IAC WILL Echo */
- "\xFF\xFD\x03" /* IAC DO Suppress Go Ahead */
- "\xFF\xFE\x01"; /* IAC DON'T Echo */
-
- #define CTRL(c) (c - '@')
- #define TELNET_HISTORY ".openocd_history"
-
- /* The only way we can detect that the socket is closed is the first time
- * we write to it, we will fail. Subsequent write operations will
- * succeed. Shudder!
- */
- 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;
- }
-
- /* output an audible bell */
- static int telnet_bell(struct connection *connection)
- {
- /* ("\a" does not work, at least on windows) */
- 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;
-
- /* process lines in buffer */
- 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;
- } else
- line += len;
- }
-
- 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 the prompt is not visible, simply output the message. */
- if (!t_con->prompt_visible) {
- telnet_outputline(connection, string);
- return;
- }
-
- /* Clear the command line. */
- 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);
-
- /* Put the command line to its previous state. */
- 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;
- }
-
- 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);
- }
-
- t_con->next_history = i;
- t_con->next_history %= TELNET_LINE_HISTORY_SIZE;
- /* try to set to last entry - 1, that way we skip over any exit/shutdown cmds */
- t_con->current_history = t_con->next_history > 0 ? i - 1 : 0;
- fclose(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;
- }
-
- 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--;
- }
-
- if (num > 0) {
- for (; num > 0; num--) {
- fprintf(histfp, "%s\n", t_con->history[i]);
- i++;
- i %= TELNET_LINE_HISTORY_SIZE;
- }
- }
- fclose(histfp);
- }
-
- free(history);
- }
-
- static int telnet_new_connection(struct connection *connection)
- {
- struct telnet_connection *telnet_connection;
- struct telnet_service *telnet_service = connection->service->priv;
- int i;
-
- telnet_connection = malloc(sizeof(struct telnet_connection));
-
- if (!telnet_connection) {
- LOG_ERROR("Failed to allocate telnet connection.");
- return ERROR_FAIL;
- }
-
- connection->priv = telnet_connection;
-
- /* initialize telnet connection information */
- telnet_connection->closed = false;
- telnet_connection->line_size = 0;
- telnet_connection->line_cursor = 0;
- telnet_connection->prompt = strdup("> ");
- telnet_connection->prompt_visible = true;
- telnet_connection->state = TELNET_STATE_DATA;
-
- /* output goes through telnet connection */
- command_set_output_handler(connection->cmd_ctx, telnet_output, connection);
-
- /* negotiate telnet options */
- telnet_write(connection, negotiate, strlen(negotiate));
-
- /* print connection banner */
- if (telnet_service->banner) {
- telnet_write(connection, telnet_service->banner, strlen(telnet_service->banner));
- telnet_write(connection, "\r\n", 2);
- }
-
- /* the prompt is always placed at the line beginning */
- telnet_write(connection, "\r", 1);
- telnet_prompt(connection);
-
- /* initialize history */
- for (i = 0; i < TELNET_LINE_HISTORY_SIZE; i++)
- telnet_connection->history[i] = NULL;
- telnet_connection->next_history = 0;
- telnet_connection->current_history = 0;
- 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)
- {
- /* move to end of line */
- 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);
-
- /* backspace, overwrite with space, backspace */
- while (t_con->line_size > 0) {
- telnet_write(connection, "\b \b", 3);
- t_con->line_size--;
- }
- 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;
- }
- 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 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;
-
- /*
- * The tc->next_history line contains empty string (unless NULL), thus
- * it is not printed.
- */
- 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);
- }
- }
-
- tc->line_size = 0;
- tc->line_cursor = 0;
-
- /* The prompt is always placed at the line beginning. */
- telnet_write(connection, "\r", 1);
-
- return telnet_prompt(connection);
- }
-
- static void telnet_move_cursor(struct connection *connection, size_t pos)
- {
- struct telnet_connection *tc;
- size_t tmp;
-
- tc = connection->priv;
-
- 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));
- } 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));
- }
-
- tc->line_cursor = pos;
- }
-
- /* check buffer size leaving one spare character for string null termination */
- 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;
- }
-
- /* write to telnet console, and update the telnet_connection members
- * this function is capable of inserting in the middle of a line
- * please ensure that data does not contain special characters (\n, \r, \t, \b ...)
- *
- * returns false when it fails to insert the requested data
- */
- 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 (t_con->line_cursor < t_con->line_size) {
- /* we have some content after the cursor */
- memmove(t_con->line + t_con->line_cursor + len,
- t_con->line + t_con->line_cursor,
- t_con->line_size - t_con->line_cursor);
- }
-
- 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_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);
-
- /* user command sequence, either at line beginning
- * or we start over after these characters ';', '[', '{' */
- size_t seq_start = (t_con->line_cursor == 0) ? 0 : (t_con->line_cursor - 1);
- while (seq_start > 0) {
- char c = t_con->line[seq_start];
- if (c == ';' || c == '[' || c == '{') {
- seq_start++;
- break;
- }
-
- seq_start--;
- }
-
- /* user command position in the line, ignore leading spaces */
- 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++;
-
- /* user command length */
- size_t usr_cmd_len = t_con->line_cursor - usr_cmd_pos;
-
- /* optimize multiple spaces in the user command,
- * because info commands does not tolerate multiple spaces */
- 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;
- }
-
- query[i - optimized_spaces] = t_con->line[usr_cmd_pos + i];
- }
-
- usr_cmd_len -= optimized_spaces;
- query[usr_cmd_len] = '\0';
-
- /* filter commands */
- char *query_cmd = alloc_printf("_telnet_autocomplete_helper {%s*}", query);
-
- if (!query_cmd) {
- LOG_ERROR("Out of memory");
- return;
- }
-
- 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);
-
- /* common prefix length of the matched commands */
- size_t common_len = 0;
- char *first_match = NULL; /* used to compute the common prefix length */
-
- 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);
-
- /* validate the command */
- bool ignore_cmd = false;
- Jim_Cmd *jim_cmd = Jim_GetCommand(command_context->interp, elem, JIM_NONE);
-
- if (!jim_cmd) {
- /* Why we are here? Let's ignore it! */
- ignore_cmd = true;
- } else if (jimcmd_is_oocd_command(jim_cmd)) {
- struct command *cmd = jimcmd_privdata(jim_cmd);
-
- if (cmd && !cmd->handler && !cmd->jim_handler) {
- /* Initial part of a multi-word command. Ignore it! */
- ignore_cmd = true;
- } else if (cmd && cmd->mode == COMMAND_CONFIG) {
- /* Not executable after config phase. Ignore it! */
- ignore_cmd = true;
- }
- }
-
- /* save the command in the prediction list */
- 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; /* break the for loop */
- }
-
- if (list_empty(&matches)) {
- common_len = strlen(name);
- first_match = name;
- } else {
- size_t new_common_len = usr_cmd_len; /* save some loops */
-
- while (new_common_len < common_len && first_match[new_common_len] == name[new_common_len])
- new_common_len++;
-
- common_len = new_common_len;
- }
-
- match->cmd = name;
- list_add_tail(&match->lh, &matches);
- }
-
- Jim_DecrRefCount(command_context->interp, elem);
- }
- /* end of command filtering */
-
- /* proceed with auto-completion */
- 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)) {
- /* in bash this extra space is only added when the cursor in at the end of line */
- if (list_is_singular(&matches) && t_con->line_cursor == t_con->line_size)
- telnet_insert(connection, " ", 1);
- }
- } 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);
- }
-
- telnet_prompt(connection);
- telnet_write(connection, t_con->line, t_con->line_size);
-
- /* restore the terminal visible cursor location */
- for (size_t i = t_con->line_cursor; i < t_con->line_size; i++)
- telnet_write(connection, "\b", 1);
- }
-
- /* destroy the command_list */
- 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;
- struct command_context *command_context = connection->cmd_ctx;
-
- 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;
- }
-
- buf_p = buffer;
- while (bytes_read) {
- switch (t_con->state) {
- case TELNET_STATE_DATA:
- if (*buf_p == 0xff)
- t_con->state = TELNET_STATE_IAC;
- else {
- if (isprint(*buf_p)) { /* printable character */
- telnet_insert(connection, buf_p, 1);
- } else { /* non-printable */
- if (*buf_p == 0x1b) { /* escape */
- t_con->state = TELNET_STATE_ESCAPE;
- t_con->last_escape = '\x00';
- } else if ((*buf_p == 0xd) || (*buf_p == 0xa)) { /* CR/LF */
- int retval;
-
- /* skip over combinations with CR/LF and NUL characters */
- if ((bytes_read > 1) && ((*(buf_p + 1) == 0xa) ||
- (*(buf_p + 1) == 0xd))) {
- buf_p++;
- bytes_read--;
- }
- if ((bytes_read > 1) && (*(buf_p + 1) == 0)) {
- buf_p++;
- bytes_read--;
- }
- t_con->line[t_con->line_size] = 0;
-
- 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;
-
- continue;
- }
-
- /* save only non-blank not repeating lines in the history */
- 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))) {
- /* if the history slot is already taken, free it */
- free(t_con->history[t_con->next_history]);
-
- /* add line to history */
- t_con->history[t_con->next_history] = strdup(t_con->line);
-
- /* wrap history at TELNET_LINE_HISTORY_SIZE */
- t_con->next_history = (t_con->next_history + 1) %
- TELNET_LINE_HISTORY_SIZE;
-
- /* current history line starts at the new entry */
- t_con->current_history =
- t_con->next_history;
-
- free(t_con->history[t_con->current_history]);
- t_con->history[t_con->current_history] = strdup("");
- }
-
- t_con->line_size = 0;
-
- /* to suppress prompt in log callback during command execution */
- 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;
-
- /* the prompt is always * placed at the line beginning */
- telnet_write(connection, "\r", 1);
-
- retval = telnet_prompt(connection);
- if (retval == ERROR_SERVER_REMOTE_CLOSED)
- return ERROR_SERVER_REMOTE_CLOSED;
-
- } else if ((*buf_p == 0x7f) || (*buf_p == 0x8)) { /* delete character */
- if (t_con->line_cursor > 0) {
- 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);
- } else {
- t_con->line_size--;
- t_con->line_cursor--;
- /* back space: move the 'printer' head one char
- * back, overwrite with space, move back again */
- telnet_write(connection, "\b \b", 3);
- }
- }
- } else if (*buf_p == 0x15) /* clear line */
- telnet_clear_line(connection, t_con);
- else if (*buf_p == CTRL('B')) { /* cursor left */
- if (t_con->line_cursor > 0) {
- telnet_write(connection, "\b", 1);
- t_con->line_cursor--;
- }
- t_con->state = TELNET_STATE_DATA;
- } else if (*buf_p == CTRL('F')) { /* cursor right */
- if (t_con->line_cursor < t_con->line_size)
- telnet_write(connection, t_con->line + t_con->line_cursor++, 1);
- t_con->state = TELNET_STATE_DATA;
- } else if (*buf_p == CTRL('P')) /* cursor up */
- telnet_history_up(connection);
- else if (*buf_p == CTRL('N')) /* cursor down */
- telnet_history_down(connection);
- else if (*buf_p == CTRL('A'))
- telnet_move_cursor(connection, 0);
- else if (*buf_p == CTRL('E'))
- telnet_move_cursor(connection, t_con->line_size);
- else if (*buf_p == CTRL('K')) { /* kill line to end */
- if (t_con->line_cursor < t_con->line_size) {
- /* overwrite with space, until end of line, move back */
- 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;
- }
- } else if (*buf_p == '\t')
- telnet_auto_complete(connection);
- else
- LOG_DEBUG("unhandled nonprintable: %2.2x", *buf_p);
- }
- }
- break;
- case TELNET_STATE_IAC:
- switch (*buf_p) {
- case 0xfe:
- t_con->state = TELNET_STATE_DONT;
- break;
- case 0xfd:
- t_con->state = TELNET_STATE_DO;
- break;
- case 0xfc:
- t_con->state = TELNET_STATE_WONT;
- break;
- case 0xfb:
- t_con->state = TELNET_STATE_WILL;
- break;
- }
- break;
- case TELNET_STATE_SB:
- break;
- case TELNET_STATE_SE:
- break;
- 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_ESCAPE:
- if (t_con->last_escape == '[') {
- if (*buf_p == 'D') { /* cursor left */
- if (t_con->line_cursor > 0) {
- telnet_write(connection, "\b", 1);
- t_con->line_cursor--;
- }
- t_con->state = TELNET_STATE_DATA;
- } else if (*buf_p == 'C') { /* cursor right */
- if (t_con->line_cursor < t_con->line_size)
- telnet_write(connection,
- t_con->line + t_con->line_cursor++, 1);
- t_con->state = TELNET_STATE_DATA;
- } else if (*buf_p == 'A') { /* cursor up */
- telnet_history_up(connection);
- } else if (*buf_p == 'B') { /* cursor down */
- telnet_history_down(connection);
- } else if (*buf_p == 'F') { /* end key */
- telnet_move_cursor(connection, t_con->line_size);
- t_con->state = TELNET_STATE_DATA;
- } else if (*buf_p == 'H') { /* home key */
- telnet_move_cursor(connection, 0);
- t_con->state = TELNET_STATE_DATA;
- } else if (*buf_p == '3')
- t_con->last_escape = *buf_p;
- else
- t_con->state = TELNET_STATE_DATA;
- } else if (t_con->last_escape == '3') {
- /* Remove character */
- if (*buf_p == '~') {
- if (t_con->line_cursor < t_con->line_size) {
- size_t i;
- t_con->line_size--;
- /* remove char from line buffer */
- memmove(t_con->line + t_con->line_cursor,
- t_con->line + t_con->line_cursor + 1,
- t_con->line_size - t_con->line_cursor);
-
- /* print remainder of buffer */
- telnet_write(connection, t_con->line + t_con->line_cursor,
- t_con->line_size - t_con->line_cursor);
- /* overwrite last char with whitespace */
- telnet_write(connection, " \b", 2);
-
- /* move back to cursor position*/
- for (i = t_con->line_cursor; i < t_con->line_size; i++)
- telnet_write(connection, "\b", 1);
- }
-
- t_con->state = TELNET_STATE_DATA;
- } else
- t_con->state = TELNET_STATE_DATA;
- } else if (t_con->last_escape == '\x00') {
- if (*buf_p == '[')
- t_con->last_escape = *buf_p;
- else
- t_con->state = TELNET_STATE_DATA;
- } else {
- LOG_ERROR("BUG: unexpected value in t_con->last_escape");
- t_con->state = TELNET_STATE_DATA;
- }
-
- break;
- default:
- LOG_ERROR("unknown telnet state");
- return ERROR_FAIL;
- }
-
- bytes_read--;
- buf_p++;
- }
-
- 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;
-
- /* save telnet history */
- telnet_save_history(t_con);
-
- for (i = 0; i < TELNET_LINE_HISTORY_SIZE; i++) {
- free(t_con->history[i]);
- t_con->history[i] = NULL;
- }
-
- /* if this connection registered a debug-message receiver delete it */
- delete_debug_msg_receiver(connection->cmd_ctx, NULL);
-
- free(connection->priv);
- connection->priv = NULL;
-
- return ERROR_OK;
- }
-
- int telnet_init(char *banner)
- {
- if (strcmp(telnet_port, "disabled") == 0) {
- LOG_INFO("telnet server disabled");
- return ERROR_OK;
- }
-
- struct telnet_service *telnet_service =
- malloc(sizeof(struct telnet_service));
-
- if (!telnet_service) {
- LOG_ERROR("Failed to allocate telnet service.");
- return ERROR_FAIL;
- }
-
- telnet_service->banner = banner;
-
- int ret = add_service("telnet", telnet_port, CONNECTION_LIMIT_UNLIMITED,
- telnet_new_connection, telnet_input, telnet_connection_closed,
- telnet_service);
-
- if (ret != ERROR_OK) {
- free(telnet_service);
- return ret;
- }
-
- return ERROR_OK;
- }
-
- /* daemon configuration command telnet_port */
- 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_EXEC,
- .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);
- }
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