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-rw-r--r--src/server/telnet_server.c380
1 files changed, 173 insertions, 207 deletions
diff --git a/src/server/telnet_server.c b/src/server/telnet_server.c
index 2be5ccc8..5d2e3bc9 100644
--- a/src/server/telnet_server.c
+++ b/src/server/telnet_server.c
@@ -23,6 +23,7 @@
* Free Software Foundation, Inc., *
* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. *
***************************************************************************/
+
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
@@ -33,10 +34,10 @@
static const 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 */
+ "\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 - '@')
@@ -45,16 +46,14 @@ static char *negotiate =
* succeed. Shudder!
*/
static int telnet_write(struct connection *connection, const void *data,
- int len)
+ 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 = 1;
return ERROR_SERVER_REMOTE_CLOSED;
}
@@ -80,21 +79,17 @@ static int telnet_outputline(struct connection *connection, const char *line)
len = strlen(line);
telnet_write(connection, line, len);
- if (line_end)
- {
+ if (line_end) {
telnet_write(connection, "\r\n", 2);
line += len + 1;
- }
- else
- {
+ } else
line += len;
- }
}
return ERROR_OK;
}
-static int telnet_output(struct command_context *cmd_ctx, const char* line)
+static int telnet_output(struct command_context *cmd_ctx, const char *line)
{
struct connection *connection = cmd_ctx->output_handler_priv;
@@ -102,15 +97,14 @@ static int telnet_output(struct command_context *cmd_ctx, const char* line)
}
static void telnet_log_callback(void *priv, const char *file, unsigned line,
- const char *function, const char *string)
+ const char *function, const char *string)
{
struct connection *connection = priv;
struct telnet_connection *t_con = connection->priv;
int i;
/* if there is no prompt, simply output the message */
- if (t_con->line_cursor < 0)
- {
+ if (t_con->line_cursor < 0) {
telnet_outputline(connection, string);
return;
}
@@ -156,20 +150,18 @@ static int telnet_new_connection(struct connection *connection)
telnet_write(connection, negotiate, strlen(negotiate));
/* print connection banner */
- if (telnet_service->banner)
- {
+ if (telnet_service->banner) {
telnet_write(connection, telnet_service->banner, strlen(telnet_service->banner));
telnet_write(connection, "\r\n", 2);
}
- telnet_write(connection, "\r", 1); /* the prompt is always placed at the line beginning */
+ telnet_write(connection, "\r", 1); /* the prompt is always placed at the line beginning
+ **/
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;
@@ -179,17 +171,16 @@ static int telnet_new_connection(struct connection *connection)
}
static void telnet_clear_line(struct connection *connection,
- struct telnet_connection *t_con)
+ 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);
- }
+ 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)
- {
+ while (t_con->line_size > 0) {
telnet_write(connection, "\b \b", 3);
t_con->line_size--;
}
@@ -208,71 +199,68 @@ static int telnet_input(struct connection *connection)
if (bytes_read == 0)
return ERROR_SERVER_REMOTE_CLOSED;
- else if (bytes_read == -1)
- {
+ 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)
- {
+ 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 */
- {
- /* watch buffer size leaving one spare character for string null termination */
- if (t_con->line_size == TELNET_LINE_MAX_SIZE-1)
- {
+ else {
+ if (isprint(*buf_p)) { /* printable character */
+ /* watch buffer size leaving one spare character for
+ *string null termination */
+ if (t_con->line_size == TELNET_LINE_MAX_SIZE-1) {
/* output audible bell if buffer is full */
- telnet_write(connection, "\x07", 1); /* "\a" does not work, at least on windows */
- }
- else if (t_con->line_cursor == t_con->line_size)
- {
+ telnet_write(connection, "\x07", 1); /*
+ *"\a"
+ *does
+ *not
+ *work,
+ *at
+ *least
+ *on
+ *windows
+ **/
+ } else if (t_con->line_cursor == t_con->line_size) {
telnet_write(connection, buf_p, 1);
t_con->line[t_con->line_size++] = *buf_p;
t_con->line_cursor++;
- }
- else
- {
+ } 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);
+ 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);
+ telnet_write(connection,
+ t_con->line + t_con->line_cursor,
+ t_con->line_size - t_con->line_cursor);
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 */
- {
+ } 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 */
- {
+ } 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)))
- {
+ /* 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))
- {
+ if ((bytes_read > 1) && (*(buf_p + 1) == 0)) {
buf_p++;
bytes_read--;
}
@@ -280,16 +268,19 @@ static int telnet_input(struct connection *connection)
telnet_write(connection, "\r\n\x00", 3);
- if (strcmp(t_con->line, "history") == 0)
- {
+ if (strcmp(t_con->line, "history") == 0) {
int i;
- for (i = 1; i < TELNET_LINE_HISTORY_SIZE; i++)
- {
- /* the t_con->next_history line contains empty string (unless NULL), thus it is not printed */
- char *history_line = t_con->history[(t_con->next_history + i) % TELNET_LINE_HISTORY_SIZE];
- if (history_line)
- {
- telnet_write(connection, history_line, strlen(history_line));
+ for (i = 1; i < TELNET_LINE_HISTORY_SIZE; i++) {
+ /* the t_con->next_history
+ *line contains empty string
+ *(unless NULL), thus it is
+ *not printed */
+ char *history_line = t_con->history[(t_con->
+ next_history + i) %
+ TELNET_LINE_HISTORY_SIZE];
+ if (history_line) {
+ telnet_write(connection, history_line,
+ strlen(history_line));
telnet_write(connection, "\r\n\x00", 3);
}
}
@@ -298,35 +289,41 @@ static int telnet_input(struct connection *connection)
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 == NULL || strcmp(t_con->line, prev_line)))
- {
- /* if the history slot is already taken, free it */
+ /* 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 == NULL ||
+ strcmp(t_con->line, prev_line))) {
+ /* 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;
+ /* 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;
+ /* 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("");
}
t_con->line_size = 0;
- t_con->line_cursor = -1; /* to supress prompt in log callback during command execution */
+ t_con->line_cursor = -1; /* to supress prompt
+ *in log callback
+ *during command
+ *execution */
retval = command_run_line(command_context, t_con->line);
@@ -335,83 +332,84 @@ static int telnet_input(struct connection *connection)
if (retval == ERROR_COMMAND_CLOSE_CONNECTION)
return ERROR_SERVER_REMOTE_CLOSED;
- telnet_write(connection, "\r", 1); /* the prompt is always placed at the line beginning */
+ telnet_write(connection, "\r", 1); /*
+ *the
+ *prompt
+ *is
+ *always
+ *placed
+ *at
+ *the
+ *line
+ *beginning
+ **/
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)
- {
+ } 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);
+ 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
- {
+ } else {
t_con->line_size--;
t_con->line_cursor--;
- /* back space: move the 'printer' head one char back, overwrite with space, move back again */
+ /* 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 */
- {
+ } 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)
- {
+ 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 */
- {
+ } 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
- {
+ } 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;
+ 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:
@@ -425,30 +423,22 @@ static int telnet_input(struct connection *connection)
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)
- {
+ 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 */
- {
+ } 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);
- }
+ 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])
- {
+ } 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;
@@ -457,12 +447,9 @@ static int telnet_input(struct connection *connection)
t_con->current_history = last_history;
}
t_con->state = TELNET_STATE_DATA;
- }
- else if (*buf_p == 'B') /* cursor down */
- {
+ } 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])
- {
+ 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;
@@ -471,60 +458,41 @@ static int telnet_input(struct connection *connection)
t_con->current_history = next_history;
}
t_con->state = TELNET_STATE_DATA;
- }
- else if (*buf_p == '3')
- {
+ } 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')
- {
+ } else if (t_con->last_escape == '3') {
/* Remove character */
- if (*buf_p == '~')
- {
- if (t_con->line_cursor < t_con->line_size)
- {
+ 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);
+ 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);
+ 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
- {
+ } else
t_con->state = TELNET_STATE_DATA;
- }
- }
- else if (t_con->last_escape == '\x00')
- {
+ } else if (t_con->last_escape == '\x00') {
if (*buf_p == '[')
- {
t_con->last_escape = *buf_p;
- }
else
- {
t_con->state = TELNET_STATE_DATA;
- }
- }
- else
- {
+ } else {
LOG_ERROR("BUG: unexpected value in t_con->last_escape");
t_con->state = TELNET_STATE_DATA;
}
@@ -549,16 +517,13 @@ static int telnet_connection_closed(struct connection *connection)
log_remove_callback(telnet_log_callback, connection);
- if (t_con->prompt)
- {
+ 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])
- {
+ for (i = 0; i < TELNET_LINE_HISTORY_SIZE; i++) {
+ if (t_con->history[i]) {
free(t_con->history[i]);
t_con->history[i] = NULL;
}
@@ -567,23 +532,18 @@ static int telnet_connection_closed(struct connection *connection)
/* if this connection registered a debug-message receiver delete it */
delete_debug_msg_receiver(connection->cmd_ctx, NULL);
- if (connection->priv)
- {
+ if (connection->priv) {
free(connection->priv);
connection->priv = NULL;
- }
- else
- {
+ } else
LOG_ERROR("BUG: connection->priv == NULL");
- }
return ERROR_OK;
}
int telnet_init(char *banner)
{
- if (strcmp(telnet_port, "disabled") == 0)
- {
+ if (strcmp(telnet_port, "disabled") == 0) {
LOG_INFO("telnet server disabled");
return ERROR_OK;
}
@@ -592,7 +552,13 @@ int telnet_init(char *banner)
telnet_service->banner = banner;
- return add_service("telnet", telnet_port, 1, telnet_new_connection, telnet_input, telnet_connection_closed, telnet_service);
+ return add_service("telnet",
+ telnet_port,
+ 1,
+ telnet_new_connection,
+ telnet_input,
+ telnet_connection_closed,
+ telnet_service);
}
/* daemon configuration command telnet_port */
generated by cgit v1.2.3-18-g5258 (git 2.32.0) at 2024-10-18 16:21:43 +0000