FreeRDP/channels/rdpdr/client/rdpdr_main.c

/**
 * FreeRDP: A Remote Desktop Protocol Implementation
 * Device Redirection Virtual Channel
 *
 * Copyright 2010-2011 Vic Lee
 * Copyright 2010-2012 Marc-Andre Moreau <marcandre.moreau@gmail.com>
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include <winpr/crt.h>
#include <winpr/stream.h>

#include <freerdp/types.h>
#include <freerdp/constants.h>
#include <freerdp/channels/log.h>
#include <freerdp/channels/rdpdr.h>

#ifdef _WIN32
#include <windows.h>
#include <dbt.h>
#else
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#endif

#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif

#include "rdpdr_capabilities.h"

#include "devman.h"
#include "irp.h"

#include "rdpdr_main.h"

typedef struct _DEVICE_DRIVE_EXT DEVICE_DRIVE_EXT;

struct _DEVICE_DRIVE_EXT
{
	DEVICE device;
	char* path;
};

static void rdpdr_send_device_list_announce_request(rdpdrPlugin* rdpdr, BOOL userLoggedOn);

static void rdpdr_send_device_list_remove_request(rdpdrPlugin* rdpdr, UINT32 count, UINT32 ids[])
{
	UINT32 i;
	wStream* s;

	s = Stream_New(NULL, 256);

	Stream_Write_UINT16(s, RDPDR_CTYP_CORE);
	Stream_Write_UINT16(s, PAKID_CORE_DEVICELIST_REMOVE);
	Stream_Write_UINT32(s, count);

	for (i = 0; i < count; i++)
		Stream_Write_UINT32(s, ids[i]);

	Stream_SealLength(s);

	rdpdr_send(rdpdr, s);
}

#ifdef _WIN32

LRESULT CALLBACK hotplug_proc(HWND hWnd, UINT Msg, WPARAM wParam, LPARAM lParam)
{
	rdpdrPlugin *rdpdr;
	PDEV_BROADCAST_HDR lpdb = (PDEV_BROADCAST_HDR)lParam;

	rdpdr = (rdpdrPlugin *)GetWindowLongPtr(hWnd, GWLP_USERDATA);

	switch(Msg)
	{
		case WM_DEVICECHANGE:
			switch (wParam)
			{
				case DBT_DEVICEARRIVAL:
					if (lpdb -> dbch_devicetype == DBT_DEVTYP_VOLUME)
					{
						PDEV_BROADCAST_VOLUME lpdbv = (PDEV_BROADCAST_VOLUME)lpdb;
						DWORD unitmask = lpdbv->dbcv_unitmask;
						int i;
						char drive_path[4] = { 'c', ':', '/', '\0'};

						for (i = 0; i < 26; i++)
						{
							if (unitmask & 0x01)
							{
								RDPDR_DRIVE* drive;

								drive_path[0] = 'A' + i;

								drive = (RDPDR_DRIVE*) malloc(sizeof(RDPDR_DRIVE));
								ZeroMemory(drive, sizeof(RDPDR_DRIVE));

								drive->Type = RDPDR_DTYP_FILESYSTEM;

								drive->Path = _strdup(drive_path);
								drive_path[1] = '\0';
								drive->Name = _strdup(drive_path);
								devman_load_device_service(rdpdr->devman, (RDPDR_DEVICE *)drive);
								rdpdr_send_device_list_announce_request(rdpdr, TRUE);
							}
							unitmask = unitmask >> 1;
						}
					}
					break;

				case DBT_DEVICEREMOVECOMPLETE:
					if (lpdb -> dbch_devicetype == DBT_DEVTYP_VOLUME)
					{
						PDEV_BROADCAST_VOLUME lpdbv = (PDEV_BROADCAST_VOLUME)lpdb;
						DWORD unitmask = lpdbv->dbcv_unitmask;
						int i, j, count;
						char drive_name_upper, drive_name_lower;

						ULONG_PTR *keys;
						DEVICE_DRIVE_EXT *device_ext;
						UINT32 ids[1];

						for (i = 0; i < 26; i++)
						{
							if (unitmask & 0x01)
							{
								drive_name_upper = 'A' + i;
								drive_name_lower = 'a' + i;

								count = ListDictionary_GetKeys(rdpdr->devman->devices, &keys);

								for (j = 0; j < count; j++)
								{
									device_ext = (DEVICE_DRIVE_EXT *)ListDictionary_GetItemValue(rdpdr->devman->devices, (void *)keys[j]);
									if (device_ext->path[0] == drive_name_upper || device_ext->path[0] == drive_name_lower)
									{
										devman_unregister_device(rdpdr->devman, (void *)keys[j]);
										ids[0] = keys[j];
										rdpdr_send_device_list_remove_request(rdpdr, 1, ids);
										break;
									}
								}
							}
							unitmask = unitmask >> 1;
						}
					}
					break;

				default:
					break;
			}
			break;

		default:
			return DefWindowProc(hWnd, Msg, wParam, lParam);
	}
	return DefWindowProc(hWnd, Msg, wParam, lParam);
}

static void* drive_hotplug_thread_func(void* arg)
{
	rdpdrPlugin *rdpdr;
	WNDCLASSEX wnd_cls;
	HWND hwnd;
	MSG msg;
	BOOL bRet;
	DEV_BROADCAST_HANDLE NotificationFilter;
	HDEVNOTIFY hDevNotify;

	rdpdr = (rdpdrPlugin *)arg;

	/* init windows class */
	wnd_cls.cbSize        = sizeof(WNDCLASSEX);
	wnd_cls.style         = CS_HREDRAW | CS_VREDRAW;
	wnd_cls.lpfnWndProc   = hotplug_proc;
	wnd_cls.cbClsExtra    = 0;
	wnd_cls.cbWndExtra    = 0;
	wnd_cls.hIcon         = LoadIcon(NULL, IDI_APPLICATION);
	wnd_cls.hCursor       = NULL;
	wnd_cls.hbrBackground = (HBRUSH)GetStockObject(WHITE_BRUSH);
	wnd_cls.lpszMenuName  = NULL;
	wnd_cls.lpszClassName = L"DRIVE_HOTPLUG";
	wnd_cls.hInstance     = NULL;
	wnd_cls.hIconSm       = LoadIcon(NULL, IDI_APPLICATION);
	RegisterClassEx(&wnd_cls);

	/* create window */
	hwnd = CreateWindowEx(0, L"DRIVE_HOTPLUG", NULL,
			0, 0, 0, 0, 0,
			NULL, NULL, NULL, NULL);
	SetWindowLongPtr(hwnd, GWLP_USERDATA, (LONG_PTR)rdpdr);

	rdpdr->hotplug_wnd = hwnd;
	/* register device interface to hwnd */
	NotificationFilter.dbch_size = sizeof(DEV_BROADCAST_HANDLE);
	NotificationFilter.dbch_devicetype = DBT_DEVTYP_HANDLE;
	hDevNotify = RegisterDeviceNotification(hwnd, &NotificationFilter, DEVICE_NOTIFY_WINDOW_HANDLE);

	/* message loop */
	while ((bRet = GetMessage(&msg, 0, 0, 0)) != 0)
	{
		if (bRet == -1)
		{
			break;
		}
		else
		{
			TranslateMessage(&msg);
			DispatchMessage(&msg);
		}
	}

	UnregisterDeviceNotification(hDevNotify);

	return NULL;
}

static void drive_hotplug_thread_terminate(rdpdrPlugin* rdpdr)
{
	if (rdpdr->hotplug_wnd)
		PostMessage(rdpdr->hotplug_wnd, WM_QUIT, 0, 0);
}

#else

#define MAX_USB_DEVICES 100

typedef struct _hotplug_dev {
	char* path;
	BOOL  to_add;
} hotplug_dev;

static char* next_line(FILE* fd, size_t* len)
{
	size_t newsiz;
	int c;
	char* newbuf;
	char* lrbuf;
	int lrsiz;

	*len = 0;
	lrsiz = 0;
	lrbuf = NULL;
	newbuf = NULL;

	for (;;)
	{
		c = fgetc(fd);
		if (ferror(fd))
			return NULL;

		if (c == EOF)
		{
			if (*len == 0)
				return NULL;
			else
			{
				lrbuf[(*len)] = '\0';
				return lrbuf;
			}
		}
		else
		{
			if (*len == lrsiz)
			{
				newsiz = lrsiz + 4096;
				newbuf = realloc(lrbuf, newsiz);
				if (newbuf == NULL)
					return NULL;
				lrbuf = newbuf;
				lrsiz = newsiz;
			}
			lrbuf[(*len)] = c;

			if (c == '\n')
			{
				lrbuf[(*len)] = '\0';
				return lrbuf;
			}

			(*len)++;
		}
	}
}

static char* get_word(char* str, unsigned int* offset)
{
	char* p;
	char* tmp;
	char* word;
	int wlen;

	if (*offset >= strlen(str))
		return NULL;

	p = str + *offset;
	tmp = p;

	while (*tmp != ' ' && *tmp  != '\0')
		tmp++;

	wlen = tmp - p;
	*offset += wlen;

	/* in case there are more than one space between words */
	while (*(str + *offset) == ' ')
		(*offset)++;

	word = malloc(wlen + 1);
	
	if (word != NULL)
	{
		CopyMemory(word, p, wlen);
		word[wlen] = '\0';
	}
	
	return word;
}

static void handle_hotplug(rdpdrPlugin* rdpdr)
{
	FILE *f;
	size_t len;
	char *line;
	char *word;
	unsigned int wlen;

	hotplug_dev dev_array[MAX_USB_DEVICES];
	int i, j;
	int size = 0;

	int count;
	DEVICE_DRIVE_EXT *device_ext;
	ULONG_PTR *keys;
	UINT32 ids[1];

	f = fopen("/proc/mounts", "r");
	if (f == NULL)
	{
		return;
	}

	while ((line = next_line(f, &len)))
	{
		wlen = 0;
		while ((word = get_word(line, &wlen)))
		{
			/* copy hotpluged device mount point to the dev_array */
			if (strstr(word, "/mnt/") != NULL || strstr(word, "/media/") != NULL)
			{
				dev_array[size].path = strdup(word);
				dev_array[size++].to_add = TRUE;
			}
			free(word);
		}
		free(line);
	}

	fclose(f);

	/* delete removed devices */
	count = ListDictionary_GetKeys(rdpdr->devman->devices, &keys);

	for (j = 0; j < count; j++)
	{
		BOOL dev_found = FALSE;

		device_ext = (DEVICE_DRIVE_EXT *)ListDictionary_GetItemValue(rdpdr->devman->devices, (void *)keys[j]);

		/* not plugable device */
		if (strstr(device_ext->path, "/mnt/") == NULL && strstr(device_ext->path, "/media/") == NULL)
			continue;

		for (i = 0; i < size; i++)
		{
			if (strstr(device_ext->path, dev_array[i].path) != NULL)
			{
				dev_found = TRUE;
				dev_array[i].to_add = FALSE;
				break;
			}
		}

		if (!dev_found)
		{
			devman_unregister_device(rdpdr->devman, (void *)keys[j]);
			ids[0] = keys[j];
			rdpdr_send_device_list_remove_request(rdpdr, 1, ids);
		}
	}

	/* add new devices */
	for (i = 0; i < size; i++)
	{
		RDPDR_DRIVE* drive;

		if (dev_array[i].to_add)
		{
			char* name;

			drive = (RDPDR_DRIVE*) malloc(sizeof(RDPDR_DRIVE));
			ZeroMemory(drive, sizeof(RDPDR_DRIVE));

			drive->Type = RDPDR_DTYP_FILESYSTEM;

			drive->Path = _strdup(dev_array[i].path);
			name = strrchr(drive->Path, '/') + 1;
			drive->Name = _strdup(name);
			devman_load_device_service(rdpdr->devman, (RDPDR_DEVICE *)drive);
		}

		free(dev_array[i].path);
		dev_array[i].path = NULL;
	}
	rdpdr_send_device_list_announce_request(rdpdr, TRUE);
}

static void* drive_hotplug_thread_func(void* arg)
{
	rdpdrPlugin* rdpdr;
	int mfd;
	fd_set rfds;
	struct timeval tv;
	int rv;

	rdpdr = (rdpdrPlugin*) arg;

	rdpdr->stopEvent = CreateEvent(NULL, TRUE, FALSE, NULL);

	mfd = open("/proc/mounts", O_RDONLY, 0);

	if (mfd < 0)
	{
		WLog_ERR(TAG, "ERROR: Unable to open /proc/mounts.");
		return NULL;
	}

	FD_ZERO(&rfds);
	FD_SET(mfd, &rfds);
	tv.tv_sec = 1;
	tv.tv_usec = 0;

	handle_hotplug(rdpdr);

	while ((rv = select(mfd+1, NULL, NULL, &rfds, &tv)) >= 0)
	{
		if (WaitForSingleObject(rdpdr->stopEvent, 0) == WAIT_OBJECT_0)
			break;

		if (FD_ISSET(mfd, &rfds))
		{
			/* file /proc/mounts changed, handle this */
			handle_hotplug(rdpdr);
		}

		FD_ZERO(&rfds);
		FD_SET(mfd, &rfds);
		tv.tv_sec = 1;
		tv.tv_usec = 0;
	}

	return NULL;
}

static void drive_hotplug_thread_terminate(rdpdrPlugin* rdpdr)
{
	if (rdpdr->hotplugThread)
	{
		if (rdpdr->stopEvent)
			SetEvent(rdpdr->stopEvent);

		WaitForSingleObject(rdpdr->hotplugThread, INFINITE);
		rdpdr->hotplugThread = NULL;
	}
}

#endif


static void rdpdr_process_connect(rdpdrPlugin* rdpdr)
{
	UINT32 index;
	RDPDR_DEVICE* device;
	rdpSettings* settings;

	rdpdr->devman = devman_new(rdpdr);
	settings = (rdpSettings*) rdpdr->channelEntryPoints.pExtendedData;
	if (settings->ClientHostname)
		strncpy(rdpdr->computerName, settings->ClientHostname, sizeof(rdpdr->computerName) - 1);
	else
		strncpy(rdpdr->computerName, settings->ComputerName, sizeof(rdpdr->computerName) - 1);

	for (index = 0; index < settings->DeviceCount; index++)
	{
		device = settings->DeviceArray[index];

		if (device->Name && (strcmp(device->Name, "*") == 0))
		{
			rdpdr->hotplugThread = CreateThread(NULL, 0,
					(LPTHREAD_START_ROUTINE) drive_hotplug_thread_func, rdpdr, 0, NULL);
			continue;
		}

		devman_load_device_service(rdpdr->devman, device);
	}
}

static void rdpdr_process_server_announce_request(rdpdrPlugin* rdpdr, wStream* s)
{
	Stream_Read_UINT16(s, rdpdr->versionMajor);
	Stream_Read_UINT16(s, rdpdr->versionMinor);
	Stream_Read_UINT32(s, rdpdr->clientID);

	rdpdr->sequenceId++;
}

static void rdpdr_send_client_announce_reply(rdpdrPlugin* rdpdr)
{
	wStream* s;

	s = Stream_New(NULL, 12);

	Stream_Write_UINT16(s, RDPDR_CTYP_CORE); /* Component (2 bytes) */
	Stream_Write_UINT16(s, PAKID_CORE_CLIENTID_CONFIRM); /* PacketId (2 bytes) */

	Stream_Write_UINT16(s, rdpdr->versionMajor);
	Stream_Write_UINT16(s, rdpdr->versionMinor);
	Stream_Write_UINT32(s, (UINT32) rdpdr->clientID);

	rdpdr_send(rdpdr, s);
}

static void rdpdr_send_client_name_request(rdpdrPlugin* rdpdr)
{
	wStream* s;
	WCHAR* computerNameW = NULL;
	size_t computerNameLenW;

	if (!rdpdr->computerName[0])
		gethostname(rdpdr->computerName, sizeof(rdpdr->computerName) - 1);

	computerNameLenW = ConvertToUnicode(CP_UTF8, 0, rdpdr->computerName, -1, &computerNameW, 0) * 2;

	s = Stream_New(NULL, 16 + computerNameLenW + 2);

	Stream_Write_UINT16(s, RDPDR_CTYP_CORE); /* Component (2 bytes) */
	Stream_Write_UINT16(s, PAKID_CORE_CLIENT_NAME); /* PacketId (2 bytes) */

	Stream_Write_UINT32(s, 1); /* unicodeFlag, 0 for ASCII and 1 for Unicode */
	Stream_Write_UINT32(s, 0); /* codePage, must be set to zero */
	Stream_Write_UINT32(s, computerNameLenW + 2); /* computerNameLen, including null terminator */
	Stream_Write(s, computerNameW, computerNameLenW);
	Stream_Write_UINT16(s, 0); /* null terminator */

	free(computerNameW);

	rdpdr_send(rdpdr, s);
}

static void rdpdr_process_server_clientid_confirm(rdpdrPlugin* rdpdr, wStream* s)
{
	UINT16 versionMajor;
	UINT16 versionMinor;
	UINT32 clientID;

	Stream_Read_UINT16(s, versionMajor);
	Stream_Read_UINT16(s, versionMinor);
	Stream_Read_UINT32(s, clientID);

	if (versionMajor != rdpdr->versionMajor || versionMinor != rdpdr->versionMinor)
	{
		rdpdr->versionMajor = versionMajor;
		rdpdr->versionMinor = versionMinor;
	}

	if (clientID != rdpdr->clientID)
	{
		rdpdr->clientID = clientID;
	}
}

static void rdpdr_send_device_list_announce_request(rdpdrPlugin* rdpdr, BOOL userLoggedOn)
{
	int i;
	BYTE c;
	int pos;
	int index;
	wStream* s;
	UINT32 count;
	int data_len;
	int count_pos;
	DEVICE* device;
	int keyCount;
	ULONG_PTR* pKeys;

	s = Stream_New(NULL, 256);

	Stream_Write_UINT16(s, RDPDR_CTYP_CORE); /* Component (2 bytes) */
	Stream_Write_UINT16(s, PAKID_CORE_DEVICELIST_ANNOUNCE); /* PacketId (2 bytes) */

	count_pos = (int) Stream_GetPosition(s);
	count = 0;

	Stream_Seek_UINT32(s); /* deviceCount */

	pKeys = NULL;
	keyCount = ListDictionary_GetKeys(rdpdr->devman->devices, &pKeys);

	for (index = 0; index < keyCount; index++)
	{
		device = (DEVICE*) ListDictionary_GetItemValue(rdpdr->devman->devices, (void*) pKeys[index]);

		/**
		 * 1. versionMinor 0x0005 doesn't send PAKID_CORE_USER_LOGGEDON
		 *    so all devices should be sent regardless of user_loggedon
		 * 2. smartcard devices should be always sent
		 * 3. other devices are sent only after user_loggedon
		 */

		if ((rdpdr->versionMinor == 0x0005) ||
			(device->type == RDPDR_DTYP_SMARTCARD) || userLoggedOn)
		{
			data_len = (int) (device->data == NULL ? 0 : Stream_GetPosition(device->data));
			Stream_EnsureRemainingCapacity(s, 20 + data_len);

			Stream_Write_UINT32(s, device->type); /* deviceType */
			Stream_Write_UINT32(s, device->id); /* deviceID */
			strncpy((char*) Stream_Pointer(s), device->name, 8);

			for (i = 0; i < 8; i++)
			{
				Stream_Peek_UINT8(s, c);

				if (c > 0x7F)
					Stream_Write_UINT8(s, '_');
				else
					Stream_Seek_UINT8(s);
			}

			Stream_Write_UINT32(s, data_len);

			if (data_len > 0)
				Stream_Write(s, Stream_Buffer(device->data), data_len);

			count++;
			WLog_INFO(TAG, "registered device #%d: %s (type=%d id=%d)",
					  count, device->name, device->type, device->id);
		}
	}

	free(pKeys);

	pos = (int) Stream_GetPosition(s);
	Stream_SetPosition(s, count_pos);
	Stream_Write_UINT32(s, count);
	Stream_SetPosition(s, pos);
	Stream_SealLength(s);

	rdpdr_send(rdpdr, s);
}

static BOOL rdpdr_process_irp(rdpdrPlugin* rdpdr, wStream* s)
{
	IRP* irp;

	irp = irp_new(rdpdr->devman, s);

	if (!irp)
		return FALSE;

	IFCALL(irp->device->IRPRequest, irp->device, irp);

	return TRUE;
}

static void rdpdr_process_init(rdpdrPlugin* rdpdr)
{
	int index;
	int keyCount;
	DEVICE* device;
	ULONG_PTR* pKeys;

	pKeys = NULL;
	keyCount = ListDictionary_GetKeys(rdpdr->devman->devices, &pKeys);

	for (index = 0; index < keyCount; index++)
	{
		device = (DEVICE*) ListDictionary_GetItemValue(rdpdr->devman->devices, (void*) pKeys[index]);

		IFCALL(device->Init, device);
	}

	free(pKeys);
}

static void rdpdr_process_receive(rdpdrPlugin* rdpdr, wStream* s)
{
	UINT16 component;
	UINT16 packetId;
	UINT32 deviceId;
	UINT32 status;

	Stream_Read_UINT16(s, component); /* Component (2 bytes) */
	Stream_Read_UINT16(s, packetId); /* PacketId (2 bytes) */

	if (component == RDPDR_CTYP_CORE)
	{
		switch (packetId)
		{
			case PAKID_CORE_SERVER_ANNOUNCE:
				rdpdr_process_server_announce_request(rdpdr, s);
				rdpdr_send_client_announce_reply(rdpdr);
				rdpdr_send_client_name_request(rdpdr);
				rdpdr_process_init(rdpdr);
				break;

			case PAKID_CORE_SERVER_CAPABILITY:
				rdpdr_process_capability_request(rdpdr, s);
				rdpdr_send_capability_response(rdpdr);
				break;

			case PAKID_CORE_CLIENTID_CONFIRM:
				rdpdr_process_server_clientid_confirm(rdpdr, s);
				rdpdr_send_device_list_announce_request(rdpdr, FALSE);
				break;

			case PAKID_CORE_USER_LOGGEDON:
				rdpdr_send_device_list_announce_request(rdpdr, TRUE);
				break;

			case PAKID_CORE_DEVICE_REPLY:
				/* connect to a specific resource */
				Stream_Read_UINT32(s, deviceId);
				Stream_Read_UINT32(s, status);
				break;

			case PAKID_CORE_DEVICE_IOREQUEST:
				if (rdpdr_process_irp(rdpdr, s))
					s = NULL;
				break;

			default:
				WLog_ERR(TAG, "RDPDR_CTYP_CORE unknown PacketId: 0x%04X", packetId);
				break;

		}
	}
	else if (component == RDPDR_CTYP_PRN)
	{
		WLog_ERR(TAG, "RDPDR_CTYP_PRN unknown PacketId: 0x%04X", packetId);
	}
	else
	{
		WLog_ERR(TAG, "unknown message: Component: 0x%04X PacketId: 0x%04X",
				component, packetId);
	}

	Stream_Free(s, TRUE);
}


/****************************************************************************************/


static wListDictionary* g_InitHandles = NULL;
static wListDictionary* g_OpenHandles = NULL;

BOOL rdpdr_add_init_handle_data(void* pInitHandle, void* pUserData)
{
	if (!g_InitHandles)
	{
		g_InitHandles = ListDictionary_New(TRUE);
		if (!g_InitHandles)
			return FALSE;
	}
	return ListDictionary_Add(g_InitHandles, pInitHandle, pUserData);
}

void* rdpdr_get_init_handle_data(void* pInitHandle)
{
	void* pUserData = NULL;
	pUserData = ListDictionary_GetItemValue(g_InitHandles, pInitHandle);
	return pUserData;
}

void rdpdr_remove_init_handle_data(void* pInitHandle)
{
	ListDictionary_Remove(g_InitHandles, pInitHandle);
	if (ListDictionary_Count(g_InitHandles) < 1)
	{
		ListDictionary_Free(g_InitHandles);
		g_InitHandles = NULL;
	}
}

BOOL rdpdr_add_open_handle_data(DWORD openHandle, void* pUserData)
{
	void* pOpenHandle = (void*) (size_t) openHandle;

	if (!g_OpenHandles)
	{
		g_OpenHandles = ListDictionary_New(TRUE);
		if (!g_OpenHandles)
			return FALSE;
	}

	return ListDictionary_Add(g_OpenHandles, pOpenHandle, pUserData);
}

void* rdpdr_get_open_handle_data(DWORD openHandle)
{
	void* pUserData = NULL;
	void* pOpenHandle = (void*) (size_t) openHandle;
	pUserData = ListDictionary_GetItemValue(g_OpenHandles, pOpenHandle);
	return pUserData;
}

void rdpdr_remove_open_handle_data(DWORD openHandle)
{
	void* pOpenHandle = (void*) (size_t) openHandle;
	ListDictionary_Remove(g_OpenHandles, pOpenHandle);
	if (ListDictionary_Count(g_OpenHandles) < 1)
	{
		ListDictionary_Free(g_OpenHandles);
		g_OpenHandles = NULL;
	}
}

int rdpdr_send(rdpdrPlugin* rdpdr, wStream* s)
{
	UINT32 status = 0;
	rdpdrPlugin* plugin = (rdpdrPlugin*) rdpdr;

	if (!plugin)
	{
		status = CHANNEL_RC_BAD_INIT_HANDLE;
	}
	else
	{
		status = plugin->channelEntryPoints.pVirtualChannelWrite(plugin->OpenHandle,
			Stream_Buffer(s), (UINT32) Stream_GetPosition(s), s);
	}

	if (status != CHANNEL_RC_OK)
	{
		Stream_Free(s, TRUE);
		WLog_ERR(TAG,  "VirtualChannelWrite failed with %s [%08X]",
				 WTSErrorToString(status), status);
	}

	return status;
}

static void rdpdr_virtual_channel_event_data_received(rdpdrPlugin* rdpdr,
		void* pData, UINT32 dataLength, UINT32 totalLength, UINT32 dataFlags)
{
	wStream* data_in;

	if ((dataFlags & CHANNEL_FLAG_SUSPEND) || (dataFlags & CHANNEL_FLAG_RESUME))
	{
		/*
		 * According to MS-RDPBCGR 2.2.6.1, "All virtual channel traffic MUST be suspended.
		 * This flag is only valid in server-to-client virtual channel traffic. It MUST be
		 * ignored in client-to-server data." Thus it would be best practice to cease data
		 * transmission. However, simply returning here avoids a crash.
		 */
		return;
	}

	if (dataFlags & CHANNEL_FLAG_FIRST)
	{
		if (rdpdr->data_in != NULL)
			Stream_Free(rdpdr->data_in, TRUE);

		rdpdr->data_in = Stream_New(NULL, totalLength);
	}

	data_in = rdpdr->data_in;
	Stream_EnsureRemainingCapacity(data_in, (int) dataLength);
	Stream_Write(data_in, pData, dataLength);

	if (dataFlags & CHANNEL_FLAG_LAST)
	{
		if (Stream_Capacity(data_in) != Stream_GetPosition(data_in))
		{
			WLog_ERR(TAG, "rdpdr_virtual_channel_event_data_received: read error");
		}

		rdpdr->data_in = NULL;
		Stream_SealLength(data_in);
		Stream_SetPosition(data_in, 0);

		MessageQueue_Post(rdpdr->queue, NULL, 0, (void*) data_in, NULL);
	}
}

static VOID VCAPITYPE rdpdr_virtual_channel_open_event(DWORD openHandle, UINT event,
		LPVOID pData, UINT32 dataLength, UINT32 totalLength, UINT32 dataFlags)
{
	rdpdrPlugin* rdpdr;

	rdpdr = (rdpdrPlugin*) rdpdr_get_open_handle_data(openHandle);

	if (!rdpdr)
	{
		WLog_ERR(TAG,  "rdpdr_virtual_channel_open_event: error no match");
		return;
	}

	switch (event)
	{
		case CHANNEL_EVENT_DATA_RECEIVED:
			rdpdr_virtual_channel_event_data_received(rdpdr, pData, dataLength, totalLength, dataFlags);
			break;

		case CHANNEL_EVENT_WRITE_COMPLETE:
			Stream_Free((wStream*) pData, TRUE);
			break;

		case CHANNEL_EVENT_USER:
			break;
	}
}

static void* rdpdr_virtual_channel_client_thread(void* arg)
{
	wStream* data;
	wMessage message;
	rdpdrPlugin* rdpdr = (rdpdrPlugin*) arg;

	rdpdr_process_connect(rdpdr);

	while (1)
	{
		if (!MessageQueue_Wait(rdpdr->queue))
			break;

		if (MessageQueue_Peek(rdpdr->queue, &message, TRUE))
		{
			if (message.id == WMQ_QUIT)
				break;

			if (message.id == 0)
			{
				data = (wStream*) message.wParam;
				rdpdr_process_receive(rdpdr, data);
			}
		}
	}

	ExitThread(0);
	return NULL;
}

static void rdpdr_virtual_channel_event_connected(rdpdrPlugin* rdpdr, LPVOID pData, UINT32 dataLength)
{
	UINT32 status;

	status = rdpdr->channelEntryPoints.pVirtualChannelOpen(rdpdr->InitHandle,
		&rdpdr->OpenHandle, rdpdr->channelDef.name, rdpdr_virtual_channel_open_event);

	if (!rdpdr_add_open_handle_data(rdpdr->OpenHandle, rdpdr))
	{
		WLog_ERR(TAG,  "%s: unable to register open handle", __FUNCTION__);
		return;
	}

	if (status != CHANNEL_RC_OK)
	{
		WLog_ERR(TAG,  "pVirtualChannelOpen failed with %s [%08X]",
				 WTSErrorToString(status), status);
		return;
	}

	rdpdr->queue = MessageQueue_New(NULL);
	if (!rdpdr->queue)
	{
		WLog_ERR(TAG, "%s: unable to create queue", __FUNCTION__);
		return;
	}

	rdpdr->thread = CreateThread(NULL, 0,
			(LPTHREAD_START_ROUTINE) rdpdr_virtual_channel_client_thread, (void*) rdpdr, 0, NULL);
	if (!rdpdr->thread)
	{
		WLog_ERR(TAG, "%s: unable to create thread", __FUNCTION__);
		return;
	}
}

static void rdpdr_virtual_channel_event_disconnected(rdpdrPlugin* rdpdr)
{
	UINT rc;

	MessageQueue_PostQuit(rdpdr->queue, 0);
	WaitForSingleObject(rdpdr->thread, INFINITE);

	MessageQueue_Free(rdpdr->queue);
	CloseHandle(rdpdr->thread);

	rdpdr->queue = NULL;
	rdpdr->thread = NULL;

	drive_hotplug_thread_terminate(rdpdr);

	rc = rdpdr->channelEntryPoints.pVirtualChannelClose(rdpdr->OpenHandle);
	if (CHANNEL_RC_OK != rc)
	{
		WLog_ERR(TAG, "pVirtualChannelClose failed with %s [%08X]",
				 WTSErrorToString(rc), rc);
	}

	if (rdpdr->data_in)
	{
		Stream_Free(rdpdr->data_in, TRUE);
		rdpdr->data_in = NULL;
	}

	if (rdpdr->devman)
	{
		devman_free(rdpdr->devman);
		rdpdr->devman = NULL;
	}

	rdpdr_remove_open_handle_data(rdpdr->OpenHandle);
}

static void rdpdr_virtual_channel_event_terminated(rdpdrPlugin* rdpdr)
{
	rdpdr_remove_init_handle_data(rdpdr->InitHandle);

	free(rdpdr);
}

static VOID VCAPITYPE rdpdr_virtual_channel_init_event(LPVOID pInitHandle, UINT event, LPVOID pData, UINT dataLength)
{
	rdpdrPlugin* rdpdr;

	rdpdr = (rdpdrPlugin*) rdpdr_get_init_handle_data(pInitHandle);

	if (!rdpdr)
	{
		WLog_ERR(TAG, "rdpdr_virtual_channel_init_event: error no match");
		return;
	}

	switch (event)
	{
		case CHANNEL_EVENT_CONNECTED:
			rdpdr_virtual_channel_event_connected(rdpdr, pData, dataLength);
			break;

		case CHANNEL_EVENT_DISCONNECTED:
			rdpdr_virtual_channel_event_disconnected(rdpdr);
			break;

		case CHANNEL_EVENT_TERMINATED:
			rdpdr_virtual_channel_event_terminated(rdpdr);
			break;
	}
}

/* rdpdr is always built-in */
#define VirtualChannelEntry	rdpdr_VirtualChannelEntry

BOOL VCAPITYPE VirtualChannelEntry(PCHANNEL_ENTRY_POINTS pEntryPoints)
{
	UINT rc;
	rdpdrPlugin* rdpdr;

	rdpdr = (rdpdrPlugin*) calloc(1, sizeof(rdpdrPlugin));

	if (!rdpdr)
		return -1;

	rdpdr->channelDef.options =
			CHANNEL_OPTION_INITIALIZED |
			CHANNEL_OPTION_ENCRYPT_RDP |
			CHANNEL_OPTION_COMPRESS_RDP;

	strcpy(rdpdr->channelDef.name, "rdpdr");

	rdpdr->sequenceId = 0;

	CopyMemory(&(rdpdr->channelEntryPoints), pEntryPoints, sizeof(CHANNEL_ENTRY_POINTS_FREERDP));

	rc = rdpdr->channelEntryPoints.pVirtualChannelInit(&rdpdr->InitHandle,
		&rdpdr->channelDef, 1, VIRTUAL_CHANNEL_VERSION_WIN2000, rdpdr_virtual_channel_init_event);
	if (CHANNEL_RC_OK != rc)
	{
		WLog_ERR(TAG, "pVirtualChannelInit failed with %s [%08X]",
				 WTSErrorToString(rc), rc);
		free(rdpdr);
		return -1;
	}

	return rdpdr_add_init_handle_data(rdpdr->InitHandle, (void*) rdpdr);
}