/**
 * 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;

}
Ejemplo n.º 2
0
/**
 * 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;

}
Ejemplo n.º 3
0
/**
 * 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;

}