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-rw-r--r--src/server/telnet_server.c114
-rw-r--r--src/server/telnet_server.h2
2 files changed, 67 insertions, 49 deletions
diff --git a/src/server/telnet_server.c b/src/server/telnet_server.c
index a268d812..971a95c3 100644
--- a/src/server/telnet_server.c
+++ b/src/server/telnet_server.c
@@ -50,40 +50,64 @@ static char *negotiate =
#define CTRL(c) (c - '@')
-void telnet_prompt(connection_t *connection)
+
+/* 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));
+}
- write_socket(connection->fd, 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;
- write_socket(connection->fd, line, strlen(line));
- write_socket(connection->fd, "\r\n\0", 3);
-
- return ERROR_OK;
+ 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 = allocPrintf(format, args);
- if (t == NULL)
+ char *t=allocPrintf(format, args);
+ if (t==NULL)
return;
- telnet_output(connection->cmd_ctx, t);
+ telnet_outputline(connection, t);
+
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;
char buffer[512];
switch (event)
@@ -93,13 +117,9 @@ int telnet_target_callback_event_handler(struct target_s *target, enum target_ev
target->type->arch_state(target, buffer, 512);
buffer[511] = 0;
command_print(cmd_ctx, "%s", buffer);
- if (!t_con->suppress_prompt)
- telnet_prompt(connection);
break;
case TARGET_EVENT_RESUMED:
command_print(cmd_ctx, "Target %i resumed", get_num_by_target(target));
- if (!t_con->suppress_prompt)
- telnet_prompt(connection);
break;
default:
break;
@@ -117,24 +137,24 @@ int telnet_new_connection(connection_t *connection)
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 */
- write_socket(connection->fd, negotiate, strlen(negotiate));
+ telnet_write(connection, negotiate, strlen(negotiate));
/* print connection banner */
if (telnet_service->banner)
{
- write_socket(connection->fd, telnet_service->banner, strlen(telnet_service->banner));
- write_socket(connection->fd, "\r\n\0", 3);
+ telnet_write(connection, telnet_service->banner, strlen(telnet_service->banner));
+ telnet_write(connection, "\r\n\0", 3);
}
telnet_prompt(connection);
@@ -146,7 +166,7 @@ int telnet_new_connection(connection_t *connection)
}
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;
@@ -157,13 +177,13 @@ 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)
{
- write_socket(connection->fd, 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)
{
- write_socket(connection->fd, "\b \b", 3);
+ telnet_write(connection, "\b \b", 3);
t_con->line_size--;
}
t_con->line_cursor = 0;
@@ -201,7 +221,7 @@ int telnet_input(connection_t *connection)
{
if (isprint(*buf_p)) /* printable character */
{
- write_socket(connection->fd, buf_p, 1);
+ telnet_write(connection, buf_p, 1);
if (t_con->line_cursor == t_con->line_size)
{
t_con->line[t_con->line_size++] = *buf_p;
@@ -213,10 +233,10 @@ int telnet_input(connection_t *connection)
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++;
- write_socket(connection->fd, 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);
for (i = t_con->line_cursor; i < t_con->line_size; i++)
{
- write_socket(connection->fd, "\b", 1);
+ telnet_write(connection, "\b", 1);
}
}
}
@@ -244,7 +264,7 @@ int telnet_input(connection_t *connection)
}
t_con->line[t_con->line_size] = 0;
- write_socket(connection->fd, "\r\n\x00", 3);
+ telnet_write(connection, "\r\n\x00", 3);
if (strcmp(t_con->line, "history") == 0)
{
@@ -253,8 +273,8 @@ int telnet_input(connection_t *connection)
{
if (t_con->history[i])
{
- write_socket(connection->fd, t_con->history[i], strlen(t_con->history[i]));
- write_socket(connection->fd, "\r\n\x00", 3);
+ telnet_write(connection, t_con->history[i], strlen(t_con->history[i]));
+ telnet_write(connection, "\r\n\x00", 3);
}
}
telnet_prompt(connection);
@@ -264,7 +284,6 @@ int telnet_input(connection_t *connection)
}
log_setCallback(telnet_log_callback, connection);
- t_con->suppress_prompt = 1;
if ((retval = command_run_line(command_context, t_con->line)) != ERROR_OK)
{
@@ -273,9 +292,7 @@ int telnet_input(connection_t *connection)
return ERROR_SERVER_REMOTE_CLOSED;
}
}
-
- t_con->suppress_prompt = 0;
-
+
/* Save only non-blank lines in the history */
if (t_con->line_size > 0)
{
@@ -301,8 +318,9 @@ int telnet_input(connection_t *connection)
t_con->history[t_con->current_history] = strdup("");
}
- /* output prompt after command */
- telnet_prompt(connection);
+ int t=telnet_prompt(connection);
+ if (t==ERROR_SERVER_REMOTE_CLOSED)
+ return t;
t_con->line_size = 0;
t_con->line_cursor = 0;
@@ -314,16 +332,16 @@ int telnet_input(connection_t *connection)
if (t_con->line_cursor != t_con->line_size)
{
int i;
- write_socket(connection->fd, "\b", 1);
+ 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);
- write_socket(connection->fd, t_con->line + t_con->line_cursor, t_con->line_size - t_con->line_cursor);
- write_socket(connection->fd, " \b", 2);
+ 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++)
{
- write_socket(connection->fd, "\b", 1);
+ telnet_write(connection, "\b", 1);
}
}
else
@@ -331,7 +349,7 @@ int telnet_input(connection_t *connection)
t_con->line_size--;
t_con->line_cursor--;
/* back space: move the 'printer' head one char back, overwrite with space, move back again */
- write_socket(connection->fd, "\b \b", 3);
+ telnet_write(connection, "\b \b", 3);
}
}
}
@@ -343,7 +361,7 @@ int telnet_input(connection_t *connection)
{
if (t_con->line_cursor > 0)
{
- write_socket(connection->fd, "\b", 1);
+ telnet_write(connection, "\b", 1);
t_con->line_cursor--;
}
t_con->state = TELNET_STATE_DATA;
@@ -352,7 +370,7 @@ int telnet_input(connection_t *connection)
{
if (t_con->line_cursor < t_con->line_size)
{
- write_socket(connection->fd, 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;
}
@@ -397,7 +415,7 @@ int telnet_input(connection_t *connection)
{
if (t_con->line_cursor > 0)
{
- write_socket(connection->fd, "\b", 1);
+ telnet_write(connection, "\b", 1);
t_con->line_cursor--;
}
t_con->state = TELNET_STATE_DATA;
@@ -406,7 +424,7 @@ int telnet_input(connection_t *connection)
{
if (t_con->line_cursor < t_con->line_size)
{
- write_socket(connection->fd, 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;
}
@@ -419,7 +437,7 @@ int telnet_input(connection_t *connection)
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);
- write_socket(connection->fd, t_con->line, t_con->line_size);
+ telnet_write(connection, t_con->line, t_con->line_size);
t_con->current_history = last_history;
}
t_con->state = TELNET_STATE_DATA;
@@ -433,7 +451,7 @@ int telnet_input(connection_t *connection)
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);
- write_socket(connection->fd, t_con->line, t_con->line_size);
+ telnet_write(connection, t_con->line, t_con->line_size);
t_con->current_history = next_history;
}
t_con->state = TELNET_STATE_DATA;
@@ -460,14 +478,14 @@ int telnet_input(connection_t *connection)
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 */
- write_socket(connection->fd, 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 */
- write_socket(connection->fd, " \b", 2);
+ telnet_write(connection, " \b", 2);
/* move back to cursor position*/
for (i = t_con->line_cursor; i < t_con->line_size; i++)
{
- write_socket(connection->fd, "\b", 1);
+ telnet_write(connection, "\b", 1);
}
}
diff --git a/src/server/telnet_server.h b/src/server/telnet_server.h
index 7b4b4a22..83579f9d 100644
--- a/src/server/telnet_server.h
+++ b/src/server/telnet_server.h
@@ -44,7 +44,6 @@ enum telnet_states
typedef struct telnet_connection_s
{
char *prompt;
- int suppress_prompt;
enum telnet_states state;
char line[TELNET_LINE_MAX_SIZE];
int line_size;
@@ -55,6 +54,7 @@ typedef struct telnet_connection_s
char *history[TELNET_LINE_HISTORY_SIZE];
int next_history;
int current_history;
+ int closed;
} telnet_connection_t;
typedef struct telnet_service_s
generated by cgit v1.2.3 (git 2.39.1) at 2024-06-02 10:21:39 +0000