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-rw-r--r--src/server/telnet_server.c1262
1 files changed, 631 insertions, 631 deletions
diff --git a/src/server/telnet_server.c b/src/server/telnet_server.c
index 830cf641..5cfb0ab4 100644
--- a/src/server/telnet_server.c
+++ b/src/server/telnet_server.c
@@ -1,631 +1,631 @@
-/***************************************************************************
- * Copyright (C) 2005 by Dominic Rath *
- * Dominic.Rath@gmx.de *
- * *
- * 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, write to the *
- * Free Software Foundation, Inc., *
- * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. *
- ***************************************************************************/
-#ifdef HAVE_CONFIG_H
-#include "config.h"
-#endif
-
-#include "replacements.h"
-
-#include "telnet_server.h"
-
-#include "server.h"
-#include "log.h"
-#include "command.h"
-#include "target.h"
-#include "target_request.h"
-
-#include <stdlib.h>
-#include <unistd.h>
-#include <errno.h>
-#include <string.h>
-#include <ctype.h>
-
-static unsigned short telnet_port = 0;
-
-int handle_exit_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc);
-int handle_telnet_port_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc);
-
-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 - '@')
-
-/* 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!
- */
-int telnet_write(connection_t *connection, void *data, int len)
-{
- telnet_connection_t *t_con = connection->priv;
- if (t_con->closed)
- return ERROR_SERVER_REMOTE_CLOSED;
-
- if (write_socket(connection->fd, data, len) == len)
- {
- return ERROR_OK;
- }
- t_con->closed = 1;
- return ERROR_SERVER_REMOTE_CLOSED;
-}
-
-int telnet_prompt(connection_t *connection)
-{
- telnet_connection_t *t_con = connection->priv;
-
- return telnet_write(connection, t_con->prompt, strlen(t_con->prompt));
-}
-
-int telnet_outputline(connection_t *connection, char* line)
-{
- telnet_write(connection, line, strlen(line));
- return telnet_write(connection, "\r\n\0", 3);
-}
-
-int telnet_output(struct command_context_s *cmd_ctx, char* line)
-{
- connection_t *connection = cmd_ctx->output_handler_priv;
-
- return telnet_outputline(connection, line);
-}
-
-void telnet_log_callback(void *priv, const char *file, int line,
- const char *function, const char *format, va_list args)
-{
- connection_t *connection = priv;
- char *t = alloc_printf(format, args);
- char *t2;
- if (t == NULL)
- return;
- t2=t;
- char *endline;
- do
- {
- if ((endline=strchr(t2, '\n'))!=NULL)
- {
- *endline=0;
- }
- telnet_outputline(connection, t2);
- t2=endline+1;
- } while (endline);
-
- free(t);
-}
-
-int telnet_target_callback_event_handler(struct target_s *target, enum target_event event, void *priv)
-{
- struct command_context_s *cmd_ctx = priv;
- connection_t *connection = cmd_ctx->output_handler_priv;
- telnet_connection_t *t_con = connection->priv;
-
- switch (event)
- {
- case TARGET_EVENT_HALTED:
- target_arch_state(target);
- if (!t_con->suppress_prompt)
- telnet_prompt(connection);
- break;
- case TARGET_EVENT_RESUMED:
- if (!t_con->suppress_prompt)
- telnet_prompt(connection);
- break;
- default:
- break;
- }
-
- return ERROR_OK;
-}
-
-int telnet_new_connection(connection_t *connection)
-{
- telnet_connection_t *telnet_connection = malloc(sizeof(telnet_connection_t));
- telnet_service_t *telnet_service = connection->service->priv;
- int i;
-
- connection->priv = telnet_connection;
-
- /* initialize telnet connection information */
- telnet_connection->closed = 0;
- telnet_connection->line_size = 0;
- telnet_connection->line_cursor = 0;
- telnet_connection->option_size = 0;
- telnet_connection->prompt = strdup("> ");
- telnet_connection->suppress_prompt = 0;
- 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\0", 3);
- }
-
- 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;
-
- target_register_event_callback(telnet_target_callback_event_handler, connection->cmd_ctx);
-
- return ERROR_OK;
-}
-
-void telnet_clear_line(connection_t *connection, telnet_connection_t *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;
-}
-
-int telnet_input(connection_t *connection)
-{
- int bytes_read;
- char buffer[TELNET_BUFFER_SIZE];
- char *buf_p;
- telnet_connection_t *t_con = connection->priv;
- command_context_t *command_context = connection->cmd_ctx;
-
- bytes_read = read_socket(connection->fd, buffer, TELNET_BUFFER_SIZE);
-
- if (bytes_read == 0)
- return ERROR_SERVER_REMOTE_CLOSED;
- else if (bytes_read == -1)
- {
- 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 == '\xff')
- {
- t_con->state = TELNET_STATE_IAC;
- }
- else
- {
- if (isprint(*buf_p)) /* printable character */
- {
- telnet_write(connection, buf_p, 1);
- if (t_con->line_cursor == t_con->line_size)
- {
- t_con->line[t_con->line_size++] = *buf_p;
- t_con->line_cursor++;
- }
- else
- {
- int i;
- memmove(t_con->line + t_con->line_cursor + 1, t_con->line + t_con->line_cursor, t_con->line_size - t_con->line_cursor);
- t_con->line[t_con->line_cursor++] = *buf_p;
- t_con->line_size++;
- telnet_write(connection, t_con->line + t_con->line_cursor, t_con->line_size - t_con->line_cursor);
- for (i = t_con->line_cursor; i < t_con->line_size; i++)
- {
- telnet_write(connection, "\b", 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 + NUL */
- if (((*(buf_p + 1) == 0xa) || (*(buf_p + 1) == 0xd)) && (bytes_read > 1))
- {
- buf_p++;
- bytes_read--;
- }
- if ((*(buf_p + 1) == 0) && (bytes_read > 1))
- {
- 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)
- {
- int i;
- for (i = 0; i < TELNET_LINE_HISTORY_SIZE; i++)
- {
- if (t_con->history[i])
- {
- telnet_write(connection, t_con->history[i], strlen(t_con->history[i]));
- telnet_write(connection, "\r\n\x00", 3);
- }
- }
- telnet_prompt(connection);
- t_con->line_size = 0;
- t_con->line_cursor = 0;
- continue;
- }
-
- log_add_callback(telnet_log_callback, connection);
- t_con->suppress_prompt = 1;
-
- retval = command_run_line(command_context, t_con->line);
-
- log_remove_callback(telnet_log_callback, connection);
- t_con->suppress_prompt = 0;
-
- if (retval == ERROR_COMMAND_CLOSE_CONNECTION)
- {
- return ERROR_SERVER_REMOTE_CLOSED;
- }
-
- /* Save only non-blank lines in the history */
- if (t_con->line_size > 0)
- {
- /* if the history slot is already taken, free it */
- if (t_con->history[t_con->next_history])
- {
- 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;
-
- if (t_con->history[t_con->current_history])
- {
- free(t_con->history[t_con->current_history]);
- }
- t_con->history[t_con->current_history] = strdup("");
- }
-
- int t = telnet_prompt(connection);
- if (t == ERROR_SERVER_REMOTE_CLOSED)
- return t;
-
- t_con->line_size = 0;
- t_con->line_cursor = 0;
- }
- 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)
- {
- int 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
- {
- DEBUG("unhandled nonprintable: %2.2x", *buf_p);
- }
- }
- }
- break;
- case TELNET_STATE_IAC:
- switch (*buf_p)
- {
- case '\xfe':
- t_con->state = TELNET_STATE_DONT;
- break;
- case '\xfd':
- t_con->state = TELNET_STATE_DO;
- break;
- case '\xfc':
- t_con->state = TELNET_STATE_WONT;
- break;
- case '\xfb':
- 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 */
- {
- int last_history = (t_con->current_history > 0) ? t_con->current_history - 1 : TELNET_LINE_HISTORY_SIZE-1;
- if (t_con->history[last_history])
- {
- telnet_clear_line(connection, t_con);
- t_con->line_size = strlen(t_con->history[last_history]);
- t_con->line_cursor = t_con->line_size;
- memcpy(t_con->line, t_con->history[last_history], t_con->line_size + 1);
- telnet_write(connection, t_con->line, t_con->line_size);
- t_con->current_history = last_history;
- }
- t_con->state = TELNET_STATE_DATA;
- }
- else if (*buf_p == 'B') /* cursor down */
- {
- int next_history = (t_con->current_history + 1) % TELNET_LINE_HISTORY_SIZE;
- if (t_con->history[next_history])
- {
- telnet_clear_line(connection, t_con);
- t_con->line_size = strlen(t_con->history[next_history]);
- t_con->line_cursor = t_con->line_size;
- memcpy(t_con->line, t_con->history[next_history], t_con->line_size + 1);
- telnet_write(connection, t_con->line, t_con->line_size);
- t_con->current_history = next_history;
- }
- 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)
- {
- int 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
- {
- ERROR("BUG: unexpected value in t_con->last_escape");
- t_con->state = TELNET_STATE_DATA;
- }
-
- break;
- default:
- ERROR("unknown telnet state");
- exit(-1);
- }
-
- bytes_read--;
- buf_p++;
- }
-
- return ERROR_OK;
-}
-
-int telnet_connection_closed(connection_t *connection)
-{
- telnet_connection_t *t_con = connection->priv;
- int i;
-
- if (t_con->prompt)
- {
- free(t_con->prompt);
- t_con->prompt = NULL;
- }
-
- for (i = 0; i < TELNET_LINE_HISTORY_SIZE; i++)
- {
- if (t_con->history[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);
-
- if (connection->priv)
- {
- free(connection->priv);
- connection->priv = NULL;
- }
- else
- {
- ERROR("BUG: connection->priv == NULL");
- }
-
- target_unregister_event_callback(telnet_target_callback_event_handler, connection->cmd_ctx);
-
- return ERROR_OK;
-}
-
-int telnet_set_prompt(connection_t *connection, char *prompt)
-{
- telnet_connection_t *t_con = connection->priv;
-
- t_con->prompt = strdup(prompt);
-
- return ERROR_OK;
-}
-
-int telnet_init(char *banner)
-{
- telnet_service_t *telnet_service = malloc(sizeof(telnet_service_t));
-
- if (telnet_port == 0)
- {
- WARNING("no telnet port specified, using default port 4444");
- telnet_port = 4444;
- }
-
- telnet_service->banner = banner;
-
- add_service("telnet", CONNECTION_TELNET, telnet_port, 1, telnet_new_connection, telnet_input, telnet_connection_closed, telnet_service);
-
- return ERROR_OK;
-}
-
-int telnet_register_commands(command_context_t *command_context)
-{
- register_command(command_context, NULL, "exit", handle_exit_command,
- COMMAND_EXEC, "exit telnet session");
-
- register_command(command_context, NULL, "telnet_port", handle_telnet_port_command,
- COMMAND_CONFIG, "");
-
- return ERROR_OK;
-}
-
-/* daemon configuration command telnet_port */
-int handle_telnet_port_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc)
-{
- if (argc == 0)
- return ERROR_OK;
-
- /* only if the port wasn't overwritten by cmdline */
- if (telnet_port == 0)
- telnet_port = strtoul(args[0], NULL, 0);
-
- return ERROR_OK;
-}
-
-int handle_exit_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc)
-{
- return ERROR_COMMAND_CLOSE_CONNECTION;
-}
+/***************************************************************************
+ * Copyright (C) 2005 by Dominic Rath *
+ * Dominic.Rath@gmx.de *
+ * *
+ * 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, write to the *
+ * Free Software Foundation, Inc., *
+ * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. *
+ ***************************************************************************/
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include "replacements.h"
+
+#include "telnet_server.h"
+
+#include "server.h"
+#include "log.h"
+#include "command.h"
+#include "target.h"
+#include "target_request.h"
+
+#include <stdlib.h>
+#include <unistd.h>
+#include <errno.h>
+#include <string.h>
+#include <ctype.h>
+
+static unsigned short telnet_port = 0;
+
+int handle_exit_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc);
+int handle_telnet_port_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc);
+
+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 - '@')
+
+/* 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!
+ */
+int telnet_write(connection_t *connection, void *data, int len)
+{
+ telnet_connection_t *t_con = connection->priv;
+ if (t_con->closed)
+ return ERROR_SERVER_REMOTE_CLOSED;
+
+ if (write_socket(connection->fd, data, len) == len)
+ {
+ return ERROR_OK;
+ }
+ t_con->closed = 1;
+ return ERROR_SERVER_REMOTE_CLOSED;
+}
+
+int telnet_prompt(connection_t *connection)
+{
+ telnet_connection_t *t_con = connection->priv;
+
+ return telnet_write(connection, t_con->prompt, strlen(t_con->prompt));
+}
+
+int telnet_outputline(connection_t *connection, char* line)
+{
+ telnet_write(connection, line, strlen(line));
+ return telnet_write(connection, "\r\n\0", 3);
+}
+
+int telnet_output(struct command_context_s *cmd_ctx, char* line)
+{
+ connection_t *connection = cmd_ctx->output_handler_priv;
+
+ return telnet_outputline(connection, line);
+}
+
+void telnet_log_callback(void *priv, const char *file, int line,
+ const char *function, const char *format, va_list args)
+{
+ connection_t *connection = priv;
+ char *t = alloc_printf(format, args);
+ char *t2;
+ if (t == NULL)
+ return;
+ t2=t;
+ char *endline;
+ do
+ {
+ if ((endline=strchr(t2, '\n'))!=NULL)
+ {
+ *endline=0;
+ }
+ telnet_outputline(connection, t2);
+ t2=endline+1;
+ } while (endline);
+
+ free(t);
+}
+
+int telnet_target_callback_event_handler(struct target_s *target, enum target_event event, void *priv)
+{
+ struct command_context_s *cmd_ctx = priv;
+ connection_t *connection = cmd_ctx->output_handler_priv;
+ telnet_connection_t *t_con = connection->priv;
+
+ switch (event)
+ {
+ case TARGET_EVENT_HALTED:
+ target_arch_state(target);
+ if (!t_con->suppress_prompt)
+ telnet_prompt(connection);
+ break;
+ case TARGET_EVENT_RESUMED:
+ if (!t_con->suppress_prompt)
+ telnet_prompt(connection);
+ break;
+ default:
+ break;
+ }
+
+ return ERROR_OK;
+}
+
+int telnet_new_connection(connection_t *connection)
+{
+ telnet_connection_t *telnet_connection = malloc(sizeof(telnet_connection_t));
+ telnet_service_t *telnet_service = connection->service->priv;
+ int i;
+
+ connection->priv = telnet_connection;
+
+ /* initialize telnet connection information */
+ telnet_connection->closed = 0;
+ telnet_connection->line_size = 0;
+ telnet_connection->line_cursor = 0;
+ telnet_connection->option_size = 0;
+ telnet_connection->prompt = strdup("> ");
+ telnet_connection->suppress_prompt = 0;
+ 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\0", 3);
+ }
+
+ 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;
+
+ target_register_event_callback(telnet_target_callback_event_handler, connection->cmd_ctx);
+
+ return ERROR_OK;
+}
+
+void telnet_clear_line(connection_t *connection, telnet_connection_t *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;
+}
+
+int telnet_input(connection_t *connection)
+{
+ int bytes_read;
+ char buffer[TELNET_BUFFER_SIZE];
+ char *buf_p;
+ telnet_connection_t *t_con = connection->priv;
+ command_context_t *command_context = connection->cmd_ctx;
+
+ bytes_read = read_socket(connection->fd, buffer, TELNET_BUFFER_SIZE);
+
+ if (bytes_read == 0)
+ return ERROR_SERVER_REMOTE_CLOSED;
+ else if (bytes_read == -1)
+ {
+ 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 == '\xff')
+ {
+ t_con->state = TELNET_STATE_IAC;
+ }
+ else
+ {
+ if (isprint(*buf_p)) /* printable character */
+ {
+ telnet_write(connection, buf_p, 1);
+ if (t_con->line_cursor == t_con->line_size)
+ {
+ t_con->line[t_con->line_size++] = *buf_p;
+ t_con->line_cursor++;
+ }
+ else
+ {
+ int i;
+ memmove(t_con->line + t_con->line_cursor + 1, t_con->line + t_con->line_cursor, t_con->line_size - t_con->line_cursor);
+ t_con->line[t_con->line_cursor++] = *buf_p;
+ t_con->line_size++;
+ telnet_write(connection, t_con->line + t_con->line_cursor, t_con->line_size - t_con->line_cursor);
+ for (i = t_con->line_cursor; i < t_con->line_size; i++)
+ {
+ telnet_write(connection, "\b", 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 + NUL */
+ if (((*(buf_p + 1) == 0xa) || (*(buf_p + 1) == 0xd)) && (bytes_read > 1))
+ {
+ buf_p++;
+ bytes_read--;
+ }
+ if ((*(buf_p + 1) == 0) && (bytes_read > 1))
+ {
+ 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)
+ {
+ int i;
+ for (i = 0; i < TELNET_LINE_HISTORY_SIZE; i++)
+ {
+ if (t_con->history[i])
+ {
+ telnet_write(connection, t_con->history[i], strlen(t_con->history[i]));
+ telnet_write(connection, "\r\n\x00", 3);
+ }
+ }
+ telnet_prompt(connection);
+ t_con->line_size = 0;
+ t_con->line_cursor = 0;
+ continue;
+ }
+
+ log_add_callback(telnet_log_callback, connection);
+ t_con->suppress_prompt = 1;
+
+ retval = command_run_line(command_context, t_con->line);
+
+ log_remove_callback(telnet_log_callback, connection);
+ t_con->suppress_prompt = 0;
+
+ if (retval == ERROR_COMMAND_CLOSE_CONNECTION)
+ {
+ return ERROR_SERVER_REMOTE_CLOSED;
+ }
+
+ /* Save only non-blank lines in the history */
+ if (t_con->line_size > 0)
+ {
+ /* if the history slot is already taken, free it */
+ if (t_con->history[t_con->next_history])
+ {
+ 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;
+
+ if (t_con->history[t_con->current_history])
+ {
+ free(t_con->history[t_con->current_history]);
+ }
+ t_con->history[t_con->current_history] = strdup("");
+ }
+
+ int t = telnet_prompt(connection);
+ if (t == ERROR_SERVER_REMOTE_CLOSED)
+ return t;
+
+ t_con->line_size = 0;
+ t_con->line_cursor = 0;
+ }
+ 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)
+ {
+ int 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
+ {
+ DEBUG("unhandled nonprintable: %2.2x", *buf_p);
+ }
+ }
+ }
+ break;
+ case TELNET_STATE_IAC:
+ switch (*buf_p)
+ {
+ case '\xfe':
+ t_con->state = TELNET_STATE_DONT;
+ break;
+ case '\xfd':
+ t_con->state = TELNET_STATE_DO;
+ break;
+ case '\xfc':
+ t_con->state = TELNET_STATE_WONT;
+ break;
+ case '\xfb':
+ 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 */
+ {
+ int last_history = (t_con->current_history > 0) ? t_con->current_history - 1 : TELNET_LINE_HISTORY_SIZE-1;
+ if (t_con->history[last_history])
+ {
+ telnet_clear_line(connection, t_con);
+ t_con->line_size = strlen(t_con->history[last_history]);
+ t_con->line_cursor = t_con->line_size;
+ memcpy(t_con->line, t_con->history[last_history], t_con->line_size + 1);
+ telnet_write(connection, t_con->line, t_con->line_size);
+ t_con->current_history = last_history;
+ }
+ t_con->state = TELNET_STATE_DATA;
+ }
+ else if (*buf_p == 'B') /* cursor down */
+ {
+ int next_history = (t_con->current_history + 1) % TELNET_LINE_HISTORY_SIZE;
+ if (t_con->history[next_history])
+ {
+ telnet_clear_line(connection, t_con);
+ t_con->line_size = strlen(t_con->history[next_history]);
+ t_con->line_cursor = t_con->line_size;
+ memcpy(t_con->line, t_con->history[next_history], t_con->line_size + 1);
+ telnet_write(connection, t_con->line, t_con->line_size);
+ t_con->current_history = next_history;
+ }
+ 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)
+ {
+ int 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
+ {
+ ERROR("BUG: unexpected value in t_con->last_escape");
+ t_con->state = TELNET_STATE_DATA;
+ }
+
+ break;
+ default:
+ ERROR("unknown telnet state");
+ exit(-1);
+ }
+
+ bytes_read--;
+ buf_p++;
+ }
+
+ return ERROR_OK;
+}
+
+int telnet_connection_closed(connection_t *connection)
+{
+ telnet_connection_t *t_con = connection->priv;
+ int i;
+
+ if (t_con->prompt)
+ {
+ free(t_con->prompt);
+ t_con->prompt = NULL;
+ }
+
+ for (i = 0; i < TELNET_LINE_HISTORY_SIZE; i++)
+ {
+ if (t_con->history[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);
+
+ if (connection->priv)
+ {
+ free(connection->priv);
+ connection->priv = NULL;
+ }
+ else
+ {
+ ERROR("BUG: connection->priv == NULL");
+ }
+
+ target_unregister_event_callback(telnet_target_callback_event_handler, connection->cmd_ctx);
+
+ return ERROR_OK;
+}
+
+int telnet_set_prompt(connection_t *connection, char *prompt)
+{
+ telnet_connection_t *t_con = connection->priv;
+
+ t_con->prompt = strdup(prompt);
+
+ return ERROR_OK;
+}
+
+int telnet_init(char *banner)
+{
+ telnet_service_t *telnet_service = malloc(sizeof(telnet_service_t));
+
+ if (telnet_port == 0)
+ {
+ WARNING("no telnet port specified, using default port 4444");
+ telnet_port = 4444;
+ }
+
+ telnet_service->banner = banner;
+
+ add_service("telnet", CONNECTION_TELNET, telnet_port, 1, telnet_new_connection, telnet_input, telnet_connection_closed, telnet_service);
+
+ return ERROR_OK;
+}
+
+int telnet_register_commands(command_context_t *command_context)
+{
+ register_command(command_context, NULL, "exit", handle_exit_command,
+ COMMAND_EXEC, "exit telnet session");
+
+ register_command(command_context, NULL, "telnet_port", handle_telnet_port_command,
+ COMMAND_CONFIG, "");
+
+ return ERROR_OK;
+}
+
+/* daemon configuration command telnet_port */
+int handle_telnet_port_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc)
+{
+ if (argc == 0)
+ return ERROR_OK;
+
+ /* only if the port wasn't overwritten by cmdline */
+ if (telnet_port == 0)
+ telnet_port = strtoul(args[0], NULL, 0);
+
+ return ERROR_OK;
+}
+
+int handle_exit_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc)
+{
+ return ERROR_COMMAND_CLOSE_CONNECTION;
+}
generated by cgit v1.2.3 (git 2.46.0) at 2024-11-19 01:19:37 +0000