/**
* The thread which handles all user input, calling event handlers for received
* instructions.
*
* @param data
* A pointer to a guac_user_input_thread_params structure describing the
* user whose input is being handled and the guac_parser with which to
* handle it.
*
* @return
* Always NULL.
*/
static void* guac_user_input_thread(void* data) {
guac_user_input_thread_params* params =
(guac_user_input_thread_params*) data;
int usec_timeout = params->usec_timeout;
guac_user* user = params->user;
guac_parser* parser = params->parser;
guac_client* client = user->client;
guac_socket* socket = user->socket;
/* Guacamole user input loop */
while (client->state == GUAC_CLIENT_RUNNING && user->active) {
/* Read instruction, stop on error */
if (guac_parser_read(parser, socket, usec_timeout)) {
if (guac_error == GUAC_STATUS_TIMEOUT)
guac_user_abort(user, GUAC_PROTOCOL_STATUS_CLIENT_TIMEOUT, "User is not responding.");
else {
if (guac_error != GUAC_STATUS_CLOSED)
guac_user_log_guac_error(user, GUAC_LOG_WARNING,
"Guacamole connection failure");
guac_user_stop(user);
}
return NULL;
}
/* Reset guac_error and guac_error_message (user/client handlers are not
* guaranteed to set these) */
guac_error = GUAC_STATUS_SUCCESS;
guac_error_message = NULL;
/* Call handler, stop on error */
if (guac_user_handle_instruction(user, parser->opcode, parser->argc, parser->argv) < 0) {
/* Log error */
guac_user_log_guac_error(user, GUAC_LOG_WARNING,
"User connection aborted");
/* Log handler details */
guac_user_log(user, GUAC_LOG_DEBUG, "Failing instruction handler in user was \"%s\"", parser->opcode);
guac_user_stop(user);
return NULL;
}
}
return NULL;
}
/**
* Callback which is invoked by guac_client_foreach_user() to flush all
* pending data on the given user's socket. If an error occurs while flushing
* a user's socket, that user is signalled to stop with guac_user_stop().
*
* @param user
* The user whose socket should be flushed.
*
* @param data
* Arbitrary data passed to guac_client_foreach_user(). This is not needed
* by this callback, and should be left as NULL.
*
* @return
* Always NULL.
*/
static void* __flush_callback(guac_user* user, void* data) {
/* Attempt flush, disconnect on failure */
if (guac_socket_flush(user->socket))
guac_user_stop(user);
return NULL;
}
/**
* Callback invoked by guac_client_foreach_user() which write a given chunk of
* data to that user's socket. If the write attempt fails, the user is
* signalled to stop with guac_user_stop().
*
* @param user
* The user that the chunk of data should be written to.
*
* @param data
* A pointer to a __write_chunk which describes the data to be written.
*
* @return
* Always NULL.
*/
static void* __write_chunk_callback(guac_user* user, void* data) {
__write_chunk* chunk = (__write_chunk*) data;
/* Attempt write, disconnect on failure */
if (guac_socket_write(user->socket, chunk->buffer, chunk->length))
guac_user_stop(user);
return NULL;
}