Exemple #1
0
//-----------------------------------------------------------------------------
static void process_events_and_channel_data_from_plugin(thread_param* param)
{
	RDP_EVENT* event;

	param->th_count++;
	while (param->th_to_finish == 0)
	{
		freerdp_channels_check_fds(param->chan_man, param->instance);

		while (1)
		{
			event = freerdp_channels_pop_event(param->chan_man);
			if (event == NULL) break;

			static int counter = 0;
			counter++;

			printf("UI receive event. (type=%d counter=%d).\n",
					event->event_type,
					counter);

			// add to global event list
			if (param->in_events_number < RAIL_ARRAY_SIZE(param->in_events))
			{
				save_event(event, &param->in_events[param->in_events_number]);
				param->in_events_number++;
			}
			freerdp_event_free(event);
		}

		usleep(1000);
	}
	param->th_count--;
}
Exemple #2
0
void rds_process_channel_event(rdpChannels* channels, freerdp* instance)
{
	rdsContext* rds;
	wMessage* event;

	rds = (rdsContext*) instance->context;

	event = freerdp_channels_pop_event(channels);

	if (event)
	{
		switch (GetMessageClass(event->id))
		{
			case RailChannel_Class:
				break;

			case TsmfChannel_Class:
				break;

			case CliprdrChannel_Class:
				break;

			case RdpeiChannel_Class:
				break;

			default:
				break;
		}

		freerdp_event_free(event);
	}
}
Exemple #3
0
void test_channels(void)
{
	rdpChannels* chan_man;
	rdpSettings settings = { 0 };
	freerdp instance = { 0 };
	RDP_EVENT* event;

	settings.hostname = "testhost";
	instance.settings = &settings;
	instance.SendChannelData = test_rdp_channel_data;

	chan_man = freerdp_channels_new();

	freerdp_channels_load_plugin(chan_man, &settings, "../channels/rdpdbg/rdpdbg.so", NULL);
	freerdp_channels_pre_connect(chan_man, &instance);
	freerdp_channels_post_connect(chan_man, &instance);

	freerdp_channels_data(&instance, 0, "testdata", 8, CHANNEL_FLAG_FIRST | CHANNEL_FLAG_LAST, 8);
	freerdp_channels_data(&instance, 0, "testdata1", 9, CHANNEL_FLAG_FIRST | CHANNEL_FLAG_LAST, 9);
	freerdp_channels_data(&instance, 0, "testdata11", 10, CHANNEL_FLAG_FIRST | CHANNEL_FLAG_LAST, 10);
	freerdp_channels_data(&instance, 0, "testdata111", 11, CHANNEL_FLAG_FIRST | CHANNEL_FLAG_LAST, 11);

	event = freerdp_event_new(RDP_EVENT_CLASS_DEBUG, 0, NULL, NULL);
	freerdp_channels_send_event(chan_man, event);

	while ((event = freerdp_channels_pop_event(chan_man)) == NULL)
	{
		freerdp_channels_check_fds(chan_man, &instance);
	}
	printf("responded event_type %d\n", event->event_type);
	freerdp_event_free(event);

	freerdp_channels_close(chan_man, &instance);
	freerdp_channels_free(chan_man);
}
Exemple #4
0
void wf_process_channel_event(rdpChannels* channels, freerdp* instance)
{
	RDP_EVENT* event;

	event = freerdp_channels_pop_event(channels);

	if (event)
		freerdp_event_free(event);
}
Exemple #5
0
void tf_process_channel_event(rdpChannels* channels, freerdp* instance)
{
	RDP_EVENT* event;

	event = freerdp_channels_pop_event(channels);

	if (event)
	{
		switch (event->event_type)
		{
			case RDP_EVENT_TYPE_CB_MONITOR_READY:
				tf_process_cb_monitor_ready_event(channels, instance);
				break;
			default:
				printf("tf_process_channel_event: unknown event type %d\n", event->event_type);
				break;
		}

		freerdp_event_free(event);
	}
}
Exemple #6
0
void android_process_channel_event(rdpChannels* channels, freerdp* instance)
{
	wMessage* event;

	event = freerdp_channels_pop_event(channels);

	if (event)
	{
		switch(GetMessageClass(event->id))
		{
			case CliprdrChannel_Class:
				android_process_cliprdr_event(instance, event);
				break;

			default:
				break;
		}

		freerdp_event_free(event);
	}
}
Exemple #7
0
void tf_process_channel_event(rdpChannels* channels, freerdp* instance)
{
	wMessage* event;

	event = freerdp_channels_pop_event(channels);

	if (event)
	{
		switch (GetMessageType(event->id))
		{
			case CliprdrChannel_MonitorReady:
				tf_process_cb_monitor_ready_event(channels, instance);
				break;

			default:
				printf("tf_process_channel_event: unknown event type %d\n", GetMessageType(event->id));
				break;
		}

		freerdp_event_free(event);
	}
}
Exemple #8
0
static void android_process_channel_event(rdpChannels* channels, freerdp* instance)
{
	wMessage* event;

	event = freerdp_channels_pop_event(channels);

	if (event)
	{
		int ev = GetMessageClass(event->id);
		switch(ev)
		{
			case CliprdrChannel_Class:
				android_process_cliprdr_event(instance, event);
				break;

			default:
				DEBUG_ANDROID("Unsupported channel event %08X", ev);
				break;
		}

		freerdp_event_free(event);
	}
}
Exemple #9
0
void wf_process_channel_event(rdpChannels* channels, freerdp* instance)
{
	wfContext* wfc;
	wMessage* event;

	wfc = (wfContext*) instance->context;
	event = freerdp_channels_pop_event(channels);

	if (event)
	{
		switch (GetMessageClass(event->id))
		{
			case CliprdrChannel_Class:
				wf_process_cliprdr_event(wfc, event);
				break;

			default:
				break;
		}

		freerdp_event_free(event);
	}
}
Exemple #10
0
void test_cliprdr(void)
{
	int i;
	rdpChannels* channels;
	rdpSettings settings = { 0 };
	freerdp instance = { 0 };
	RDP_EVENT* event;
	RDP_CB_FORMAT_LIST_EVENT* format_list_event;
	RDP_CB_DATA_REQUEST_EVENT* data_request_event;
	RDP_CB_DATA_RESPONSE_EVENT* data_response_event;

	settings.hostname = "testhost";
	instance.settings = &settings;
	instance.SendChannelData = test_rdp_channel_data;

	channels = freerdp_channels_new();

	freerdp_channels_load_plugin(channels, &settings, "../channels/cliprdr/cliprdr.so", NULL);
	freerdp_channels_pre_connect(channels, &instance);
	freerdp_channels_post_connect(channels, &instance);

	/* server sends cliprdr capabilities and monitor ready PDU */
	freerdp_channels_data(&instance, 0, (char*)test_clip_caps_data, sizeof(test_clip_caps_data) - 1,
		CHANNEL_FLAG_FIRST | CHANNEL_FLAG_LAST, sizeof(test_clip_caps_data) - 1);

	freerdp_channels_data(&instance, 0, (char*)test_monitor_ready_data, sizeof(test_monitor_ready_data) - 1,
		CHANNEL_FLAG_FIRST | CHANNEL_FLAG_LAST, sizeof(test_monitor_ready_data) - 1);

	/* cliprdr sends clipboard_sync event to UI */
	while ((event = freerdp_channels_pop_event(channels)) == NULL)
	{
		freerdp_channels_check_fds(channels, &instance);
	}
	printf("Got event %d\n", event->event_type);
	CU_ASSERT(event->event_type == RDP_EVENT_TYPE_CB_MONITOR_READY);
	freerdp_event_free(event);

	/* UI sends format_list event to cliprdr */
	event = freerdp_event_new(RDP_EVENT_CLASS_CLIPRDR, RDP_EVENT_TYPE_CB_FORMAT_LIST, event_process_callback, NULL);
	format_list_event = (RDP_CB_FORMAT_LIST_EVENT*) event;
	format_list_event->num_formats = 2;
	format_list_event->formats = (uint32*) xmalloc(sizeof(uint32) * 2);
	format_list_event->formats[0] = CB_FORMAT_TEXT;
	format_list_event->formats[1] = CB_FORMAT_HTML;
	event_processed = 0;
	freerdp_channels_send_event(channels, event);

	/* cliprdr sends format list PDU to server */
	while (!event_processed)
	{
		freerdp_channels_check_fds(channels, &instance);
	}

	/* server sends format list response PDU to cliprdr */
	freerdp_channels_data(&instance, 0, (char*)test_format_list_response_data, sizeof(test_format_list_response_data) - 1,
		CHANNEL_FLAG_FIRST | CHANNEL_FLAG_LAST, sizeof(test_format_list_response_data) - 1);

	/* server sends format list PDU to cliprdr */
	freerdp_channels_data(&instance, 0, (char*)test_format_list_data, sizeof(test_format_list_data) - 1,
		CHANNEL_FLAG_FIRST | CHANNEL_FLAG_LAST, sizeof(test_format_list_data) - 1);

	/* cliprdr sends format_list event to UI */
	while ((event = freerdp_channels_pop_event(channels)) == NULL)
	{
		freerdp_channels_check_fds(channels, &instance);
	}
	printf("Got event %d\n", event->event_type);
	CU_ASSERT(event->event_type == RDP_EVENT_TYPE_CB_FORMAT_LIST);
	if (event->event_type == RDP_EVENT_TYPE_CB_FORMAT_LIST)
	{
		format_list_event = (RDP_CB_FORMAT_LIST_EVENT*)event;
		for (i = 0; i < format_list_event->num_formats; i++)
			printf("Format: 0x%X\n", format_list_event->formats[i]);
	}
	freerdp_event_free(event);

	/* server sends data request PDU to cliprdr */
	freerdp_channels_data(&instance, 0, (char*)test_data_request_data, sizeof(test_data_request_data) - 1,
		CHANNEL_FLAG_FIRST | CHANNEL_FLAG_LAST, sizeof(test_data_request_data) - 1);

	/* cliprdr sends data request event to UI */
	while ((event = freerdp_channels_pop_event(channels)) == NULL)
	{
		freerdp_channels_check_fds(channels, &instance);
	}
	printf("Got event %d\n", event->event_type);
	CU_ASSERT(event->event_type == RDP_EVENT_TYPE_CB_DATA_REQUEST);
	if (event->event_type == RDP_EVENT_TYPE_CB_DATA_REQUEST)
	{
		data_request_event = (RDP_CB_DATA_REQUEST_EVENT*)event;
		printf("Requested format: 0x%X\n", data_request_event->format);
	}
	freerdp_event_free(event);

	/* UI sends data response event to cliprdr */
	event = freerdp_event_new(RDP_EVENT_CLASS_CLIPRDR, RDP_EVENT_TYPE_CB_DATA_RESPONSE, event_process_callback, NULL);
	data_response_event = (RDP_CB_DATA_RESPONSE_EVENT*)event;
	data_response_event->data = (uint8*)xmalloc(6);
	strcpy((char*)data_response_event->data, "hello");
	data_response_event->size = 6;
	event_processed = 0;
	freerdp_channels_send_event(channels, event);

	/* cliprdr sends data response PDU to server */
	while (!event_processed)
	{
		freerdp_channels_check_fds(channels, &instance);
	}

	/* UI sends data request event to cliprdr */
	event = freerdp_event_new(RDP_EVENT_CLASS_CLIPRDR, RDP_EVENT_TYPE_CB_DATA_REQUEST, event_process_callback, NULL);
	data_request_event = (RDP_CB_DATA_REQUEST_EVENT*)event;
	data_request_event->format = CB_FORMAT_UNICODETEXT;
	event_processed = 0;
	freerdp_channels_send_event(channels, event);

	/* cliprdr sends data request PDU to server */
	while (!event_processed)
	{
		freerdp_channels_check_fds(channels, &instance);
	}

	/* server sends data response PDU to cliprdr */
	freerdp_channels_data(&instance, 0, (char*)test_data_response_data, sizeof(test_data_response_data) - 1,
		CHANNEL_FLAG_FIRST | CHANNEL_FLAG_LAST, sizeof(test_data_response_data) - 1);

	/* cliprdr sends data response event to UI */
	while ((event = freerdp_channels_pop_event(channels)) == NULL)
	{
		freerdp_channels_check_fds(channels, &instance);
	}
	printf("Got event %d\n", event->event_type);
	CU_ASSERT(event->event_type == RDP_EVENT_TYPE_CB_DATA_RESPONSE);
	if (event->event_type == RDP_EVENT_TYPE_CB_DATA_RESPONSE)
	{
		data_response_event = (RDP_CB_DATA_RESPONSE_EVENT*)event;
		printf("Data response size: %d\n", data_response_event->size);
		freerdp_hexdump(data_response_event->data, data_response_event->size);
	}
	freerdp_event_free(event);

	freerdp_channels_close(channels, &instance);
	freerdp_channels_free(channels);
}
Exemple #11
0
/**
 * Connects to an RDP server as described by the guac_rdp_settings structure
 * associated with the given client, allocating and freeing all objects
 * directly related to the RDP connection. It is expected that all objects
 * which are independent of FreeRDP's state (the clipboard, display update
 * management, etc.) will already be allocated and associated with the
 * guac_rdp_client associated with the given guac_client. This function blocks
 * for the duration of the RDP session, returning only after the session has
 * completely disconnected.
 *
 * @param client
 *     The guac_client associated with the RDP settings describing the
 *     connection that should be established.
 *
 * @return
 *     Zero if the connection successfully terminated and a reconnect is
 *     desired, non-zero if an error occurs or the connection was disconnected
 *     and a reconnect is NOT desired.
 */
static int guac_rdp_handle_connection(guac_client* client) {

    guac_rdp_client* rdp_client = (guac_rdp_client*) client->data;
    guac_rdp_settings* settings = rdp_client->settings;

    /* Init random number generator */
    srandom(time(NULL));

    /* Set up screen recording, if requested */
    if (settings->recording_path != NULL) {
        guac_common_recording_create(client,
                settings->recording_path,
                settings->recording_name,
                settings->create_recording_path);
    }

    /* Create display */
    rdp_client->display = guac_common_display_alloc(client,
            rdp_client->settings->width,
            rdp_client->settings->height);

    rdp_client->current_surface = rdp_client->display->default_surface;

    rdp_client->requested_clipboard_format = CB_FORMAT_TEXT;
    rdp_client->available_svc = guac_common_list_alloc();

#ifdef HAVE_FREERDP_CHANNELS_GLOBAL_INIT
    freerdp_channels_global_init();
#endif

    /* Init client */
    freerdp* rdp_inst = freerdp_new();
    rdp_inst->PreConnect = rdp_freerdp_pre_connect;
    rdp_inst->PostConnect = rdp_freerdp_post_connect;
    rdp_inst->Authenticate = rdp_freerdp_authenticate;
    rdp_inst->VerifyCertificate = rdp_freerdp_verify_certificate;
    rdp_inst->ReceiveChannelData = __guac_receive_channel_data;

    /* Allocate FreeRDP context */
#ifdef LEGACY_FREERDP
    rdp_inst->context_size = sizeof(rdp_freerdp_context);
#else
    rdp_inst->ContextSize = sizeof(rdp_freerdp_context);
#endif
    rdp_inst->ContextNew  = (pContextNew) rdp_freerdp_context_new;
    rdp_inst->ContextFree = (pContextFree) rdp_freerdp_context_free;

    freerdp_context_new(rdp_inst);
    ((rdp_freerdp_context*) rdp_inst->context)->client = client;

    /* Load keymap into client */
    rdp_client->keyboard = guac_rdp_keyboard_alloc(client,
            settings->server_layout);

    /* Send connection name */
    guac_protocol_send_name(client->socket, settings->hostname);

    /* Set default pointer */
    guac_common_cursor_set_pointer(rdp_client->display->cursor);

    /* Push desired settings to FreeRDP */
    guac_rdp_push_settings(settings, rdp_inst);

    /* Connect to RDP server */
    if (!freerdp_connect(rdp_inst)) {
        guac_client_abort(client, GUAC_PROTOCOL_STATUS_UPSTREAM_ERROR,
                "Error connecting to RDP server");
        return 1;
    }

    /* Connection complete */
    rdp_client->rdp_inst = rdp_inst;
    rdpChannels* channels = rdp_inst->context->channels;

    guac_timestamp last_frame_end = guac_timestamp_current();

    /* Signal that reconnect has been completed */
    guac_rdp_disp_reconnect_complete(rdp_client->disp);

    /* Handle messages from RDP server while client is running */
    while (client->state == GUAC_CLIENT_RUNNING
            && !guac_rdp_disp_reconnect_needed(rdp_client->disp)) {

        /* Update remote display size */
        pthread_mutex_lock(&(rdp_client->rdp_lock));
        guac_rdp_disp_update_size(rdp_client->disp, settings, rdp_inst);
        pthread_mutex_unlock(&(rdp_client->rdp_lock));

        /* Wait for data and construct a reasonable frame */
        int wait_result = rdp_guac_client_wait_for_messages(client,
                GUAC_RDP_FRAME_START_TIMEOUT);
        if (wait_result > 0) {

            int processing_lag = guac_client_get_processing_lag(client);
            guac_timestamp frame_start = guac_timestamp_current();

            /* Read server messages until frame is built */
            do {

                guac_timestamp frame_end;
                int frame_remaining;

                pthread_mutex_lock(&(rdp_client->rdp_lock));

                /* Check the libfreerdp fds */
                if (!freerdp_check_fds(rdp_inst)) {
                    guac_client_abort(client,
                            GUAC_PROTOCOL_STATUS_SERVER_ERROR,
                            "Error handling RDP file descriptors");
                    pthread_mutex_unlock(&(rdp_client->rdp_lock));
                    return 1;
                }

                /* Check channel fds */
                if (!freerdp_channels_check_fds(channels, rdp_inst)) {
                    guac_client_abort(client,
                            GUAC_PROTOCOL_STATUS_SERVER_ERROR,
                            "Error handling RDP channel file descriptors");
                    pthread_mutex_unlock(&(rdp_client->rdp_lock));
                    return 1;
                }

                /* Check for channel events */
                wMessage* event = freerdp_channels_pop_event(channels);
                if (event) {

                    /* Handle channel events (clipboard and RAIL) */
#ifdef LEGACY_EVENT
                    if (event->event_class == CliprdrChannel_Class)
                        guac_rdp_process_cliprdr_event(client, event);
                    else if (event->event_class == RailChannel_Class)
                        guac_rdp_process_rail_event(client, event);
#else
                    if (GetMessageClass(event->id) == CliprdrChannel_Class)
                        guac_rdp_process_cliprdr_event(client, event);
                    else if (GetMessageClass(event->id) == RailChannel_Class)
                        guac_rdp_process_rail_event(client, event);
#endif

                    freerdp_event_free(event);

                }

                /* Handle RDP disconnect */
                if (freerdp_shall_disconnect(rdp_inst)) {
                    guac_client_stop(client);
                    guac_client_log(client, GUAC_LOG_INFO,
                            "RDP server closed connection");
                    pthread_mutex_unlock(&(rdp_client->rdp_lock));
                    return 1;
                }

                pthread_mutex_unlock(&(rdp_client->rdp_lock));

                /* Calculate time remaining in frame */
                frame_end = guac_timestamp_current();
                frame_remaining = frame_start + GUAC_RDP_FRAME_DURATION
                                - frame_end;

                /* Calculate time that client needs to catch up */
                int time_elapsed = frame_end - last_frame_end;
                int required_wait = processing_lag - time_elapsed;

                /* Increase the duration of this frame if client is lagging */
                if (required_wait > GUAC_RDP_FRAME_TIMEOUT)
                    wait_result = rdp_guac_client_wait_for_messages(client,
                            required_wait);

                /* Wait again if frame remaining */
                else if (frame_remaining > 0)
                    wait_result = rdp_guac_client_wait_for_messages(client,
                            GUAC_RDP_FRAME_TIMEOUT);
                else
                    break;

            } while (wait_result > 0);

            /* Record end of frame, excluding server-side rendering time (we
             * assume server-side rendering time will be consistent between any
             * two subsequent frames, and that this time should thus be
             * excluded from the required wait period of the next frame). */
            last_frame_end = frame_start;

        }

        /* If an error occurred, fail */
        if (wait_result < 0)
            guac_client_abort(client, GUAC_PROTOCOL_STATUS_UPSTREAM_ERROR,
                    "Connection closed.");

        /* Flush frame */
        guac_common_display_flush(rdp_client->display);
        guac_client_end_frame(client);
        guac_socket_flush(client->socket);

    }

    pthread_mutex_lock(&(rdp_client->rdp_lock));

    /* Disconnect client and channels */
    freerdp_channels_close(channels, rdp_inst);
    freerdp_channels_free(channels);
    freerdp_disconnect(rdp_inst);

    /* Clean up RDP client context */
    freerdp_clrconv_free(((rdp_freerdp_context*) rdp_inst->context)->clrconv);
    cache_free(rdp_inst->context->cache);
    freerdp_context_free(rdp_inst);

    /* Clean up RDP client */
    freerdp_free(rdp_inst);
    rdp_client->rdp_inst = NULL;

    /* Free SVC list */
    guac_common_list_free(rdp_client->available_svc);

    /* Free RDP keyboard state */
    guac_rdp_keyboard_free(rdp_client->keyboard);

    /* Free display */
    guac_common_display_free(rdp_client->display);

    pthread_mutex_unlock(&(rdp_client->rdp_lock));

    /* Client is now disconnected */
    guac_client_log(client, GUAC_LOG_INFO, "Internal RDP client disconnected");

    return 0;

}
Exemple #12
0
static void remmina_rdp_main_loop(RemminaProtocolWidget* gp)
{
    int i;
    int fds;
    int rcount;
    int wcount;
    int max_fds;
    void *rfds[32];
    void *wfds[32];
    fd_set rfds_set;
    fd_set wfds_set;
    rfContext* rfi;
    wMessage* event;

    memset(rfds, 0, sizeof(rfds));
    memset(wfds, 0, sizeof(wfds));

    rfi = GET_DATA(gp);

    while (1)
    {
        rcount = 0;
        wcount = 0;

        if (!freerdp_get_fds(rfi->instance, rfds, &rcount, wfds, &wcount))
        {
            break;
        }
        if (!freerdp_channels_get_fds(rfi->channels, rfi->instance, rfds, &rcount, wfds, &wcount))
        {
            break;
        }
        rf_get_fds(gp, rfds, &rcount);

        max_fds = 0;
        FD_ZERO(&rfds_set);
        for (i = 0; i < rcount; i++)
        {
            fds = (int) (UINT64) (rfds[i]);

            if (fds > max_fds)
                max_fds = fds;

            FD_SET(fds, &rfds_set);
        }

        FD_ZERO(&wfds_set);
        for (i = 0; i < wcount; i++)
        {
            fds = GPOINTER_TO_INT(wfds[i]);

            if (fds > max_fds)
                max_fds = fds;

            FD_SET(fds, &wfds_set);
        }

        /* exit if nothing to do */
        if (max_fds == 0)
        {
            break;
        }

        /* do the wait */
        if (select(max_fds + 1, &rfds_set, &wfds_set, NULL, NULL) == -1)
        {
            /* these are not really errors */
            if (!((errno == EAGAIN) ||
                    (errno == EWOULDBLOCK) ||
                    (errno == EINPROGRESS) ||
                    (errno == EINTR))) /* signal occurred */
            {
                break;
            }
        }

        /* check the libfreerdp fds */
        if (!freerdp_check_fds(rfi->instance))
        {
            break;
        }
        /* check channel fds */
        if (!freerdp_channels_check_fds(rfi->channels, rfi->instance))
        {
            break;
        }
        else
        {
            event = freerdp_channels_pop_event(rfi->channels);
            if (event)
                remmina_rdp_channels_process_event(gp, event);
        }
        /* check ui */
        if (!rf_check_fds(gp))
        {
            break;
        }
    }
}
static int rdp_guac_client_wait_for_messages(guac_client* client, int timeout_usecs) {

    rdp_guac_client_data* guac_client_data = (rdp_guac_client_data*) client->data;
    freerdp* rdp_inst = guac_client_data->rdp_inst;
    rdpChannels* channels = rdp_inst->context->channels;

    int result;
    int index;
    int max_fd, fd;
    void* read_fds[32];
    void* write_fds[32];
    int read_count = 0;
    int write_count = 0;
    fd_set rfds, wfds;

    struct timeval timeout = {
        .tv_sec  = 0,
        .tv_usec = timeout_usecs
    };

    /* Get RDP fds */
    if (!freerdp_get_fds(rdp_inst, read_fds, &read_count, write_fds, &write_count)) {
        guac_client_abort(client, GUAC_PROTOCOL_STATUS_SERVER_ERROR, "Unable to read RDP file descriptors.");
        return -1;
    }

    /* Get channel fds */
    if (!freerdp_channels_get_fds(channels, rdp_inst, read_fds, &read_count, write_fds,
                &write_count)) {
        guac_client_abort(client, GUAC_PROTOCOL_STATUS_SERVER_ERROR, "Unable to read RDP channel file descriptors.");
        return -1;
    }

    /* Construct read fd_set */
    max_fd = 0;
    FD_ZERO(&rfds);
    for (index = 0; index < read_count; index++) {
        fd = (int)(long) (read_fds[index]);
        if (fd > max_fd)
            max_fd = fd;
        FD_SET(fd, &rfds);
    }

    /* Construct write fd_set */
    FD_ZERO(&wfds);
    for (index = 0; index < write_count; index++) {
        fd = (int)(long) (write_fds[index]);
        if (fd > max_fd)
            max_fd = fd;
        FD_SET(fd, &wfds);
    }

    /* If no file descriptors, error */
    if (max_fd == 0) {
        guac_client_abort(client, GUAC_PROTOCOL_STATUS_SERVER_ERROR, "No file descriptors associated with RDP connection.");
        return -1;
    }

    /* Wait for all RDP file descriptors */
    result = select(max_fd + 1, &rfds, &wfds, NULL, &timeout);
    if (result < 0) {

        /* If error ignorable, pretend timout occurred */
        if (errno == EAGAIN
            || errno == EWOULDBLOCK
            || errno == EINPROGRESS
            || errno == EINTR)
            return 0;

        /* Otherwise, return as error */
        guac_client_abort(client, GUAC_PROTOCOL_STATUS_SERVER_ERROR, "Error waiting for file descriptor.");
        return -1;

    }

    /* Return wait result */
    return result;

}

int rdp_guac_client_handle_messages(guac_client* client) {

    rdp_guac_client_data* guac_client_data = (rdp_guac_client_data*) client->data;
    freerdp* rdp_inst = guac_client_data->rdp_inst;
    rdpChannels* channels = rdp_inst->context->channels;
    wMessage* event;

    /* Wait for messages */
    int wait_result = rdp_guac_client_wait_for_messages(client, 250000);
    guac_timestamp frame_start = guac_timestamp_current();
    while (wait_result > 0) {

        guac_timestamp frame_end;
        int frame_remaining;

        pthread_mutex_lock(&(guac_client_data->rdp_lock));

        /* Check the libfreerdp fds */
        if (!freerdp_check_fds(rdp_inst)) {
            guac_error = GUAC_STATUS_BAD_STATE;
            guac_error_message = "Error handling RDP file descriptors";
            pthread_mutex_unlock(&(guac_client_data->rdp_lock));
            return 1;
        }

        /* Check channel fds */
        if (!freerdp_channels_check_fds(channels, rdp_inst)) {
            guac_error = GUAC_STATUS_BAD_STATE;
            guac_error_message = "Error handling RDP channel file descriptors";
            pthread_mutex_unlock(&(guac_client_data->rdp_lock));
            return 1;
        }

        /* Check for channel events */
        event = freerdp_channels_pop_event(channels);
        if (event) {

            /* Handle channel events (clipboard and RAIL) */
#ifdef LEGACY_EVENT
            if (event->event_class == CliprdrChannel_Class)
                guac_rdp_process_cliprdr_event(client, event);
            else if (event->event_class == RailChannel_Class)
                guac_rdp_process_rail_event(client, event);
#else
            if (GetMessageClass(event->id) == CliprdrChannel_Class)
                guac_rdp_process_cliprdr_event(client, event);
            else if (GetMessageClass(event->id) == RailChannel_Class)
                guac_rdp_process_rail_event(client, event);
#endif

            freerdp_event_free(event);

        }

        /* Handle RDP disconnect */
        if (freerdp_shall_disconnect(rdp_inst)) {
            guac_error = GUAC_STATUS_NO_INPUT;
            guac_error_message = "RDP server closed connection";
            pthread_mutex_unlock(&(guac_client_data->rdp_lock));
            return 1;
        }

        pthread_mutex_unlock(&(guac_client_data->rdp_lock));

        /* Calculate time remaining in frame */
        frame_end = guac_timestamp_current();
        frame_remaining = frame_start + GUAC_RDP_FRAME_DURATION - frame_end;

        /* Wait again if frame remaining */
        if (frame_remaining > 0)
            wait_result = rdp_guac_client_wait_for_messages(client,
                    GUAC_RDP_FRAME_TIMEOUT*1000);
        else
            break;

    }

    /* If an error occurred, fail */
    if (wait_result < 0)
        return 1;

    /* Success */
    guac_common_surface_flush(guac_client_data->default_surface);
    return 0;

}
/**
 * Waits for messages from the RDP server for the given number of microseconds.
 *
 * @param client
 *     The client associated with the current RDP session.
 *
 * @param timeout_usecs
 *     The maximum amount of time to wait, in microseconds.
 *
 * @return
 *     A positive value if messages are ready, zero if the specified timeout
 *     period elapsed, or a negative value if an error occurs.
 */
static int rdp_guac_client_wait_for_messages(guac_client* client,
        int timeout_usecs) {

    guac_rdp_client* rdp_client = (guac_rdp_client*) client->data;
    freerdp* rdp_inst = rdp_client->rdp_inst;
    rdpChannels* channels = rdp_inst->context->channels;

    int result;
    int index;
    int max_fd, fd;
    void* read_fds[32];
    void* write_fds[32];
    int read_count = 0;
    int write_count = 0;
    fd_set rfds, wfds;

    struct timeval timeout = {
        .tv_sec  = 0,
        .tv_usec = timeout_usecs
    };

    /* Get RDP fds */
    if (!freerdp_get_fds(rdp_inst, read_fds, &read_count, write_fds, &write_count)) {
        guac_client_abort(client, GUAC_PROTOCOL_STATUS_SERVER_ERROR, "Unable to read RDP file descriptors.");
        return -1;
    }

    /* Get channel fds */
    if (!freerdp_channels_get_fds(channels, rdp_inst, read_fds, &read_count, write_fds,
                &write_count)) {
        guac_client_abort(client, GUAC_PROTOCOL_STATUS_SERVER_ERROR, "Unable to read RDP channel file descriptors.");
        return -1;
    }

    /* Construct read fd_set */
    max_fd = 0;
    FD_ZERO(&rfds);
    for (index = 0; index < read_count; index++) {
        fd = (int)(long) (read_fds[index]);
        if (fd > max_fd)
            max_fd = fd;
        FD_SET(fd, &rfds);
    }

    /* Construct write fd_set */
    FD_ZERO(&wfds);
    for (index = 0; index < write_count; index++) {
        fd = (int)(long) (write_fds[index]);
        if (fd > max_fd)
            max_fd = fd;
        FD_SET(fd, &wfds);
    }

    /* If no file descriptors, error */
    if (max_fd == 0) {
        guac_client_abort(client, GUAC_PROTOCOL_STATUS_SERVER_ERROR, "No file descriptors associated with RDP connection.");
        return -1;
    }

    /* Wait for all RDP file descriptors */
    result = select(max_fd + 1, &rfds, &wfds, NULL, &timeout);
    if (result < 0) {

        /* If error ignorable, pretend timout occurred */
        if (errno == EAGAIN
            || errno == EWOULDBLOCK
            || errno == EINPROGRESS
            || errno == EINTR)
            return 0;

        /* Otherwise, return as error */
        guac_client_abort(client, GUAC_PROTOCOL_STATUS_SERVER_ERROR, "Error waiting for file descriptor.");
        return -1;

    }

    /* Return wait result */
    return result;

}

/**
 * Connects to an RDP server as described by the guac_rdp_settings structure
 * associated with the given client, allocating and freeing all objects
 * directly related to the RDP connection. It is expected that all objects
 * which are independent of FreeRDP's state (the clipboard, display update
 * management, etc.) will already be allocated and associated with the
 * guac_rdp_client associated with the given guac_client. This function blocks
 * for the duration of the RDP session, returning only after the session has
 * completely disconnected.
 *
 * @param client
 *     The guac_client associated with the RDP settings describing the
 *     connection that should be established.
 *
 * @return
 *     Zero if the connection successfully terminated and a reconnect is
 *     desired, non-zero if an error occurs or the connection was disconnected
 *     and a reconnect is NOT desired.
 */
static int guac_rdp_handle_connection(guac_client* client) {

    guac_rdp_client* rdp_client = (guac_rdp_client*) client->data;
    guac_rdp_settings* settings = rdp_client->settings;

    /* Init random number generator */
    srandom(time(NULL));

    /* Set up screen recording, if requested */
    if (settings->recording_path != NULL) {
        guac_common_recording_create(client,
                settings->recording_path,
                settings->recording_name,
                settings->create_recording_path);
    }

    /* Create display */
    rdp_client->display = guac_common_display_alloc(client,
            rdp_client->settings->width,
            rdp_client->settings->height);

    rdp_client->current_surface = rdp_client->display->default_surface;

    rdp_client->requested_clipboard_format = CB_FORMAT_TEXT;
    rdp_client->available_svc = guac_common_list_alloc();

#ifdef HAVE_FREERDP_CHANNELS_GLOBAL_INIT
    freerdp_channels_global_init();
#endif

    /* Init client */
    freerdp* rdp_inst = freerdp_new();
    rdp_inst->PreConnect = rdp_freerdp_pre_connect;
    rdp_inst->PostConnect = rdp_freerdp_post_connect;
    rdp_inst->Authenticate = rdp_freerdp_authenticate;
    rdp_inst->VerifyCertificate = rdp_freerdp_verify_certificate;
    rdp_inst->ReceiveChannelData = __guac_receive_channel_data;

    /* Allocate FreeRDP context */
#ifdef LEGACY_FREERDP
    rdp_inst->context_size = sizeof(rdp_freerdp_context);
#else
    rdp_inst->ContextSize = sizeof(rdp_freerdp_context);
#endif
    rdp_inst->ContextNew  = (pContextNew) rdp_freerdp_context_new;
    rdp_inst->ContextFree = (pContextFree) rdp_freerdp_context_free;

    freerdp_context_new(rdp_inst);
    ((rdp_freerdp_context*) rdp_inst->context)->client = client;

    /* Load keymap into client */
    __guac_rdp_client_load_keymap(client, settings->server_layout);

    /* Send connection name */
    guac_protocol_send_name(client->socket, settings->hostname);

    /* Set default pointer */
    guac_common_cursor_set_pointer(rdp_client->display->cursor);

    /* Push desired settings to FreeRDP */
    guac_rdp_push_settings(settings, rdp_inst);

    /* Connect to RDP server */
    if (!freerdp_connect(rdp_inst)) {
        guac_client_abort(client, GUAC_PROTOCOL_STATUS_UPSTREAM_ERROR,
                "Error connecting to RDP server");
        return 1;
    }

    /* Connection complete */
    rdp_client->rdp_inst = rdp_inst;
    rdpChannels* channels = rdp_inst->context->channels;

    guac_timestamp last_frame_end = guac_timestamp_current();

    /* Signal that reconnect has been completed */
    guac_rdp_disp_reconnect_complete(rdp_client->disp);

    /* Handle messages from RDP server while client is running */
    while (client->state == GUAC_CLIENT_RUNNING
            && !guac_rdp_disp_reconnect_needed(rdp_client->disp)) {

        /* Update remote display size */
        pthread_mutex_lock(&(rdp_client->rdp_lock));
        guac_rdp_disp_update_size(rdp_client->disp, settings, rdp_inst);
        pthread_mutex_unlock(&(rdp_client->rdp_lock));

        /* Wait for data and construct a reasonable frame */
        int wait_result = rdp_guac_client_wait_for_messages(client,
                GUAC_RDP_FRAME_START_TIMEOUT);
        if (wait_result > 0) {

            int processing_lag = guac_client_get_processing_lag(client);
            guac_timestamp frame_start = guac_timestamp_current();

            /* Read server messages until frame is built */
            do {

                guac_timestamp frame_end;
                int frame_remaining;

                pthread_mutex_lock(&(rdp_client->rdp_lock));

                /* Check the libfreerdp fds */
                if (!freerdp_check_fds(rdp_inst)) {
                    guac_client_abort(client,
                            GUAC_PROTOCOL_STATUS_SERVER_ERROR,
                            "Error handling RDP file descriptors");
                    pthread_mutex_unlock(&(rdp_client->rdp_lock));
                    return 1;
                }

                /* Check channel fds */
                if (!freerdp_channels_check_fds(channels, rdp_inst)) {
                    guac_client_abort(client,
                            GUAC_PROTOCOL_STATUS_SERVER_ERROR,
                            "Error handling RDP channel file descriptors");
                    pthread_mutex_unlock(&(rdp_client->rdp_lock));
                    return 1;
                }

                /* Check for channel events */
                wMessage* event = freerdp_channels_pop_event(channels);
                if (event) {

                    /* Handle channel events (clipboard and RAIL) */
#ifdef LEGACY_EVENT
                    if (event->event_class == CliprdrChannel_Class)
                        guac_rdp_process_cliprdr_event(client, event);
                    else if (event->event_class == RailChannel_Class)
                        guac_rdp_process_rail_event(client, event);
#else
                    if (GetMessageClass(event->id) == CliprdrChannel_Class)
                        guac_rdp_process_cliprdr_event(client, event);
                    else if (GetMessageClass(event->id) == RailChannel_Class)
                        guac_rdp_process_rail_event(client, event);
#endif

                    freerdp_event_free(event);

                }

                /* Handle RDP disconnect */
                if (freerdp_shall_disconnect(rdp_inst)) {
                    guac_client_stop(client);
                    guac_client_log(client, GUAC_LOG_INFO,
                            "RDP server closed connection");
                    pthread_mutex_unlock(&(rdp_client->rdp_lock));
                    return 1;
                }

                pthread_mutex_unlock(&(rdp_client->rdp_lock));

                /* Calculate time remaining in frame */
                frame_end = guac_timestamp_current();
                frame_remaining = frame_start + GUAC_RDP_FRAME_DURATION
                                - frame_end;

                /* Calculate time that client needs to catch up */
                int time_elapsed = frame_end - last_frame_end;
                int required_wait = processing_lag - time_elapsed;

                /* Increase the duration of this frame if client is lagging */
                if (required_wait > GUAC_RDP_FRAME_TIMEOUT)
                    wait_result = rdp_guac_client_wait_for_messages(client,
                            required_wait*1000);

                /* Wait again if frame remaining */
                else if (frame_remaining > 0)
                    wait_result = rdp_guac_client_wait_for_messages(client,
                            GUAC_RDP_FRAME_TIMEOUT*1000);
                else
                    break;

            } while (wait_result > 0);
        }

        /* If an error occurred, fail */
        if (wait_result < 0)
            guac_client_abort(client, GUAC_PROTOCOL_STATUS_UPSTREAM_ERROR,
                    "Connection closed.");

        /* End of frame */
        guac_common_display_flush(rdp_client->display);
        guac_client_end_frame(client);
        guac_socket_flush(client->socket);

        /* Record end of frame */
        last_frame_end = guac_timestamp_current();

    }

    /* Kill client and finish connection */
    guac_client_stop(client);
    guac_client_log(client, GUAC_LOG_INFO, "Internal RDP client disconnected");

    pthread_mutex_lock(&(rdp_client->rdp_lock));

    /* Disconnect client and channels */
    freerdp_channels_close(channels, rdp_inst);
    freerdp_channels_free(channels);
    freerdp_disconnect(rdp_inst);

    /* Clean up RDP client context */
    freerdp_clrconv_free(((rdp_freerdp_context*) rdp_inst->context)->clrconv);
    cache_free(rdp_inst->context->cache);
    freerdp_context_free(rdp_inst);

    /* Clean up RDP client */
    freerdp_free(rdp_inst);
    rdp_client->rdp_inst = NULL;

    /* Free SVC list */
    guac_common_list_free(rdp_client->available_svc);

    /* Free display */
    guac_common_display_free(rdp_client->display);

    pthread_mutex_unlock(&(rdp_client->rdp_lock));
    return 0;

}