VBoxDragAndDropSvc.cpp@ 100682

Last change on this file since 100682 was 98103, checked in by vboxsync, 2 years ago
Copyright year updates by scm.
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1	/* $Id: VBoxDragAndDropSvc.cpp 98103 2023-01-17 14:15:46Z vboxsync $ */
2	/** @file
3	* Drag and Drop Service.
4	*/
5
6	/*
7	* Copyright (C) 2011-2023 Oracle and/or its affiliates.
8	*
9	* This file is part of VirtualBox base platform packages, as
10	* available from https://www.virtualbox.org.
11	*
12	* This program is free software; you can redistribute it and/or
13	* modify it under the terms of the GNU General Public License
14	* as published by the Free Software Foundation, in version 3 of the
15	* License.
16	*
17	* This program is distributed in the hope that it will be useful, but
18	* WITHOUT ANY WARRANTY; without even the implied warranty of
19	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
20	* General Public License for more details.
21	*
22	* You should have received a copy of the GNU General Public License
23	* along with this program; if not, see <https://www.gnu.org/licenses>.
24	*
25	* SPDX-License-Identifier: GPL-3.0-only
26	*/
27
28	/** @page pg_svc_dnd Drag and drop HGCM Service
29	*
30	* @sa See src/VBox/Main/src-client/GuestDnDPrivate.cpp for more information.
31	*/
32
33
34	/*********************************************************************************************************************************
35	* Header Files *
36	*********************************************************************************************************************************/
37	#define LOG_GROUP LOG_GROUP_GUEST_DND
38	#include <VBox/GuestHost/DragAndDrop.h>
39	#include <VBox/GuestHost/DragAndDropDefs.h>
40	#include <VBox/HostServices/Service.h>
41	#include <VBox/HostServices/DragAndDropSvc.h>
42	#include <VBox/AssertGuest.h>
43
44	#include <VBox/err.h>
45
46	#include <algorithm>
47	#include <list>
48	#include <map>
49
50	#include "dndmanager.h"
51
52	using namespace DragAndDropSvc;
53
54
55	/*********************************************************************************************************************************
56	* Service class declaration *
57	*********************************************************************************************************************************/
58
59	class DragAndDropClient : public HGCM::Client
60	{
61	public:
62
63	DragAndDropClient(uint32_t idClient)
64	: HGCM::Client(idClient)
65	, uProtocolVerDeprecated(0)
66	, fGuestFeatures0(VBOX_DND_GF_NONE)
67	, fGuestFeatures1(VBOX_DND_GF_NONE)
68	{
69	RT_ZERO(m_SvcCtx);
70	}
71
72	virtual ~DragAndDropClient(void)
73	{
74	disconnect();
75	}
76
77	public:
78
79	void disconnect(void) RT_NOEXCEPT;
80
81	public:
82
83	/** Protocol version used by this client.
84	* Deprecated; only used for keeping backwards compatibility. */
85	uint32_t uProtocolVerDeprecated;
86	/** Guest feature flags, VBOX_DND_GF_0_XXX. */
87	uint64_t fGuestFeatures0;
88	/** Guest feature flags, VBOX_DND_GF_1_XXX. */
89	uint64_t fGuestFeatures1;
90	};
91
92	/** Map holding pointers to drag and drop clients. Key is the (unique) HGCM client ID. */
93	typedef std::map<uint32_t, DragAndDropClient*> DnDClientMap;
94
95	/** Simple queue (list) which holds deferred (waiting) clients. */
96	typedef std::list<uint32_t> DnDClientQueue;
97
98	/**
99	* Specialized drag & drop service class.
100	*/
101	class DragAndDropService : public HGCM::AbstractService<DragAndDropService>
102	{
103	public:
104	explicit DragAndDropService(PVBOXHGCMSVCHELPERS pHelpers)
105	: HGCM::AbstractService<DragAndDropService>(pHelpers)
106	, m_pManager(NULL)
107	, m_u32Mode(VBOX_DRAG_AND_DROP_MODE_OFF)
108	{}
109
110	protected:
111	int init(VBOXHGCMSVCFNTABLE *pTable) RT_NOEXCEPT RT_OVERRIDE;
112	int uninit(void) RT_NOEXCEPT RT_OVERRIDE;
113	int clientConnect(uint32_t idClient, void *pvClient) RT_NOEXCEPT RT_OVERRIDE;
114	int clientDisconnect(uint32_t idClient, void *pvClient) RT_NOEXCEPT RT_OVERRIDE;
115	int clientQueryFeatures(uint32_t cParms, VBOXHGCMSVCPARM paParms[]) RT_NOEXCEPT;
116	int clientReportFeatures(DragAndDropClient *pClient, uint32_t cParms, VBOXHGCMSVCPARM paParms[]) RT_NOEXCEPT;
117	void guestCall(VBOXHGCMCALLHANDLE callHandle, uint32_t idClient, void *pvClient, uint32_t u32Function,
118	uint32_t cParms, VBOXHGCMSVCPARM paParms[]) RT_NOEXCEPT RT_OVERRIDE;
119	int hostCall(uint32_t u32Function, uint32_t cParms, VBOXHGCMSVCPARM paParms[]) RT_NOEXCEPT RT_OVERRIDE;
120
121	private:
122	int modeSet(uint32_t u32Mode) RT_NOEXCEPT;
123	inline uint32_t modeGet(void) const RT_NOEXCEPT
124	{ return m_u32Mode; };
125
126	static DECLCALLBACK(int) progressCallback(uint32_t uStatus, uint32_t uPercentage, int rc, void *pvUser);
127
128	private:
129	/** Pointer to our DnD manager instance. */
130	DnDManager *m_pManager;
131	/** Map of all connected clients.
132	* The primary key is the (unique) client ID, the secondary value
133	* an allocated pointer to the DragAndDropClient class, managed
134	* by this service class. */
135	DnDClientMap m_clientMap;
136	/** List of all clients which are queued up (deferred return) and ready
137	* to process new commands. The key is the (unique) client ID. */
138	DnDClientQueue m_clientQueue;
139	/** Current drag and drop mode, VBOX_DRAG_AND_DROP_MODE_XXX. */
140	uint32_t m_u32Mode;
141	/** Host feature mask (VBOX_DND_HF_0_XXX) for DND_GUEST_REPORT_FEATURES
142	* and DND_GUEST_QUERY_FEATURES. */
143	uint64_t m_fHostFeatures0;
144	};
145
146
147	/*********************************************************************************************************************************
148	* Client implementation *
149	*********************************************************************************************************************************/
150
151	/**
152	* Called when the HGCM client disconnected on the guest side.
153	*
154	* This function takes care of the client's data cleanup and also lets the host
155	* know that the client has been disconnected.
156	*/
157	void DragAndDropClient::disconnect(void) RT_NOEXCEPT
158	{
159	LogFlowThisFunc(("uClient=%RU32, fDeferred=%RTbool\n", m_idClient, IsDeferred()));
160
161	/*
162	* If the client still is waiting for a message (i.e in deferred mode),
163	* complete the call with a VERR_CANCELED status so that the client (VBoxTray / VBoxClient) knows
164	* it should bail out.
165	*/
166	if (IsDeferred())
167	CompleteDeferred(VERR_CANCELLED);
168
169	/*
170	* Let the host know.
171	*/
172	VBOXDNDCBDISCONNECTMSGDATA data;
173	RT_ZERO(data);
174	/** @todo Magic needed? */
175	/** @todo Add context ID. */
176
177	if (m_SvcCtx.pfnHostCallback)
178	{
179	int rc2 = m_SvcCtx.pfnHostCallback(m_SvcCtx.pvHostData, GUEST_DND_FN_DISCONNECT, &data, sizeof(data));
180	if (RT_FAILURE(rc2))
181	LogFlowFunc(("Warning: Unable to notify host about client %RU32 disconnect, rc=%Rrc\n", m_idClient, rc2));
182	/* Not fatal. */
183	}
184	}
185
186
187	/*********************************************************************************************************************************
188	* Service class implementation *
189	*********************************************************************************************************************************/
190
191	int DragAndDropService::init(VBOXHGCMSVCFNTABLE *pTable) RT_NOEXCEPT
192	{
193	/* Legacy clients map to the root category. */
194	pTable->idxLegacyClientCategory = HGCM_CLIENT_CATEGORY_ROOT;
195
196	/* Limit to 255 clients (see also DragAndDropService::clientConnect). */
197	for (uintptr_t i = 0; i < RT_ELEMENTS(pTable->acMaxClients); i++)
198	pTable->acMaxClients[i] = UINT8_MAX;
199
200	/* Limit the number of concurrent calls to 256 (playing safe). */
201	/** @todo Properly determin the max number of pending/concurrent calls for DnD. */
202	for (uintptr_t i = 0; i < RT_ELEMENTS(pTable->acMaxClients); i++)
203	pTable->acMaxCallsPerClient[i] = 256;
204
205	/* Register functions. */
206	pTable->pfnHostCall = svcHostCall;
207	pTable->pfnSaveState = NULL; /* The service is stateless, so the normal */
208	pTable->pfnLoadState = NULL; /* construction done before restoring suffices */
209	pTable->pfnRegisterExtension = svcRegisterExtension;
210	pTable->pfnNotify = NULL;
211
212	/* Drag'n drop mode is disabled by default. */
213	modeSet(VBOX_DRAG_AND_DROP_MODE_OFF);
214
215	/* Set host features. */
216	m_fHostFeatures0 = VBOX_DND_HF_NONE;
217
218	int rc = VINF_SUCCESS;
219
220	try
221	{
222	m_pManager = new DnDManager(&DragAndDropService::progressCallback, this);
223	}
224	catch (std::bad_alloc &)
225	{
226	rc = VERR_NO_MEMORY;
227	}
228
229	LogFlowFuncLeaveRC(rc);
230	return rc;
231	}
232
233	int DragAndDropService::uninit(void) RT_NOEXCEPT
234	{
235	LogFlowFuncEnter();
236
237	if (m_pManager)
238	{
239	delete m_pManager;
240	m_pManager = NULL;
241	}
242
243	DnDClientMap::iterator itClient = m_clientMap.begin();
244	while (itClient != m_clientMap.end())
245	{
246	delete itClient->second;
247	m_clientMap.erase(itClient);
248	itClient = m_clientMap.begin();
249	}
250
251	LogFlowFuncLeave();
252	return VINF_SUCCESS;
253	}
254
255	int DragAndDropService::clientConnect(uint32_t idClient, void *pvClient) RT_NOEXCEPT
256	{
257	RT_NOREF1(pvClient);
258	if (m_clientMap.size() >= UINT8_MAX) /* Don't allow too much clients at the same time. */
259	{
260	AssertMsgFailed(("Maximum number of clients reached\n"));
261	return VERR_MAX_PROCS_REACHED;
262	}
263
264	/*
265	* Add client to our client map.
266	*/
267	if (m_clientMap.find(idClient) != m_clientMap.end())
268	{
269	LogFunc(("Client %RU32 is already connected!\n", idClient));
270	return VERR_ALREADY_EXISTS;
271	}
272
273	try
274	{
275	DragAndDropClient *pClient = new DragAndDropClient(idClient);
276	pClient->SetSvcContext(m_SvcCtx);
277	m_clientMap[idClient] = pClient;
278	}
279	catch (std::bad_alloc &)
280	{
281	LogFunc(("Client %RU32 - VERR_NO_MEMORY!\n", idClient));
282	return VERR_NO_MEMORY;
283	}
284
285	LogFlowFunc(("Client %RU32 connected (VINF_SUCCESS)\n", idClient));
286	return VINF_SUCCESS;
287	}
288
289	int DragAndDropService::clientDisconnect(uint32_t idClient, void *pvClient) RT_NOEXCEPT
290	{
291	RT_NOREF1(pvClient);
292
293	/* Client not found? Bail out early. */
294	DnDClientMap::iterator itClient = m_clientMap.find(idClient);
295	if (itClient == m_clientMap.end())
296	{
297	LogFunc(("Client %RU32 not found!\n", idClient));
298	return VERR_NOT_FOUND;
299	}
300
301	/*
302	* Remove from waiters queue.
303	*/
304	m_clientQueue.remove(idClient);
305
306	/*
307	* Remove from client map and deallocate.
308	*/
309	AssertPtr(itClient->second);
310	delete itClient->second;
311
312	m_clientMap.erase(itClient);
313
314	LogFlowFunc(("Client %RU32 disconnected\n", idClient));
315	return VINF_SUCCESS;
316	}
317
318	/**
319	* Implements GUEST_DND_FN_REPORT_FEATURES.
320	*
321	* @returns VBox status code.
322	* @retval VINF_HGCM_ASYNC_EXECUTE on success (we complete the message here).
323	* @retval VERR_ACCESS_DENIED if not master
324	* @retval VERR_INVALID_PARAMETER if bit 63 in the 2nd parameter isn't set.
325	* @retval VERR_WRONG_PARAMETER_COUNT
326	*
327	* @param pClient The client state.
328	* @param cParms Number of parameters.
329	* @param paParms Array of parameters.
330	*/
331	int DragAndDropService::clientReportFeatures(DragAndDropClient *pClient, uint32_t cParms, VBOXHGCMSVCPARM paParms[]) RT_NOEXCEPT
332	{
333	RT_NOREF(pClient);
334
335	/*
336	* Validate the request.
337	*/
338	ASSERT_GUEST_RETURN(cParms == 2, VERR_WRONG_PARAMETER_COUNT);
339	ASSERT_GUEST_RETURN(paParms[0].type == VBOX_HGCM_SVC_PARM_64BIT, VERR_WRONG_PARAMETER_TYPE);
340	uint64_t const fFeatures0 = paParms[0].u.uint64;
341	ASSERT_GUEST_RETURN(paParms[1].type == VBOX_HGCM_SVC_PARM_64BIT, VERR_WRONG_PARAMETER_TYPE);
342	uint64_t const fFeatures1 = paParms[1].u.uint64;
343	ASSERT_GUEST_RETURN(fFeatures1 & VBOX_DND_GF_1_MUST_BE_ONE, VERR_INVALID_PARAMETER);
344
345	/*
346	* Report back the host features.
347	*/
348	paParms[0].u.uint64 = m_fHostFeatures0;
349	paParms[1].u.uint64 = 0;
350
351	pClient->fGuestFeatures0 = fFeatures0;
352	pClient->fGuestFeatures1 = fFeatures1;
353
354	Log(("[Client %RU32] features: %#RX64 %#RX64\n", pClient->GetClientID(), fFeatures0, fFeatures1));
355
356	return VINF_SUCCESS;
357	}
358
359	/**
360	* Implements GUEST_DND_FN_QUERY_FEATURES.
361	*
362	* @returns VBox status code.
363	* @retval VINF_HGCM_ASYNC_EXECUTE on success (we complete the message here).
364	* @retval VERR_WRONG_PARAMETER_COUNT
365	*
366	* @param cParms Number of parameters.
367	* @param paParms Array of parameters.
368	*/
369	int DragAndDropService::clientQueryFeatures(uint32_t cParms, VBOXHGCMSVCPARM paParms[]) RT_NOEXCEPT
370	{
371	/*
372	* Validate the request.
373	*/
374	ASSERT_GUEST_RETURN(cParms == 2, VERR_WRONG_PARAMETER_COUNT);
375	ASSERT_GUEST_RETURN(paParms[0].type == VBOX_HGCM_SVC_PARM_64BIT, VERR_WRONG_PARAMETER_TYPE);
376	ASSERT_GUEST_RETURN(paParms[1].type == VBOX_HGCM_SVC_PARM_64BIT, VERR_WRONG_PARAMETER_TYPE);
377	ASSERT_GUEST(paParms[1].u.uint64 & RT_BIT_64(63));
378
379	/*
380	* Report back the host features.
381	*/
382	paParms[0].u.uint64 = m_fHostFeatures0;
383	paParms[1].u.uint64 = 0;
384
385	return VINF_SUCCESS;
386	}
387
388	int DragAndDropService::modeSet(uint32_t u32Mode) RT_NOEXCEPT
389	{
390	#ifndef VBOX_WITH_DRAG_AND_DROP_GH
391	if ( u32Mode == VBOX_DRAG_AND_DROP_MODE_GUEST_TO_HOST
392	\|\| u32Mode == VBOX_DRAG_AND_DROP_MODE_BIDIRECTIONAL)
393	{
394	m_u32Mode = VBOX_DRAG_AND_DROP_MODE_OFF;
395	return VERR_NOT_SUPPORTED;
396	}
397	#endif
398
399	switch (u32Mode)
400	{
401	case VBOX_DRAG_AND_DROP_MODE_OFF:
402	case VBOX_DRAG_AND_DROP_MODE_HOST_TO_GUEST:
403	case VBOX_DRAG_AND_DROP_MODE_GUEST_TO_HOST:
404	case VBOX_DRAG_AND_DROP_MODE_BIDIRECTIONAL:
405	m_u32Mode = u32Mode;
406	break;
407
408	default:
409	m_u32Mode = VBOX_DRAG_AND_DROP_MODE_OFF;
410	break;
411	}
412
413	return VINF_SUCCESS;
414	}
415
416	void DragAndDropService::guestCall(VBOXHGCMCALLHANDLE callHandle, uint32_t idClient,
417	void *pvClient, uint32_t u32Function,
418	uint32_t cParms, VBOXHGCMSVCPARM paParms[]) RT_NOEXCEPT
419	{
420	RT_NOREF1(pvClient);
421	LogFlowFunc(("idClient=%RU32, u32Function=%s (%#x), cParms=%RU32\n",
422	idClient, DnDGuestMsgToStr(u32Function), u32Function, cParms));
423
424	/* Check if we've the right mode set. */
425	int rc = VERR_ACCESS_DENIED; /* Play safe. */
426	switch (u32Function)
427	{
428	case GUEST_DND_FN_GET_NEXT_HOST_MSG:
429	{
430	if (modeGet() != VBOX_DRAG_AND_DROP_MODE_OFF)
431	rc = VINF_SUCCESS;
432	else
433	{
434	LogRel(("DnD: Feature is disabled, ignoring request from guest\n"));
435	rc = VINF_HGCM_ASYNC_EXECUTE;
436	}
437	break;
438	}
439
440	/* New since protocol v2. */
441	case GUEST_DND_FN_CONNECT:
442	RT_FALL_THROUGH();
443	/* New since VBox 6.1.x. */
444	case GUEST_DND_FN_REPORT_FEATURES:
445	RT_FALL_THROUGH();
446	/* New since VBox 6.1.x. */
447	case GUEST_DND_FN_QUERY_FEATURES:
448	{
449	/*
450	* Never block these calls, as the clients issues those when
451	* initializing and might get stuck if drag and drop is set to "disabled" at
452	* that time.
453	*/
454	rc = VINF_SUCCESS;
455	break;
456	}
457
458	/* New since VBOx 7.0.x. See define for details. */
459	case GUEST_DND_FN_EVT_ERROR:
460	{
461	rc = VINF_SUCCESS;
462	break;
463	}
464
465	case GUEST_DND_FN_HG_ACK_OP:
466	case GUEST_DND_FN_HG_REQ_DATA:
467	case GUEST_DND_FN_HG_EVT_PROGRESS:
468	{
469	if ( modeGet() == VBOX_DRAG_AND_DROP_MODE_BIDIRECTIONAL
470	\|\| modeGet() == VBOX_DRAG_AND_DROP_MODE_HOST_TO_GUEST)
471	rc = VINF_SUCCESS;
472	else
473	LogRel(("DnD: Host -> Guest mode disabled, ignoring request from guest\n"));
474	break;
475	}
476
477	case GUEST_DND_FN_GH_ACK_PENDING:
478	case GUEST_DND_FN_GH_SND_DATA_HDR:
479	case GUEST_DND_FN_GH_SND_DATA:
480	case GUEST_DND_FN_GH_SND_DIR:
481	case GUEST_DND_FN_GH_SND_FILE_HDR:
482	case GUEST_DND_FN_GH_SND_FILE_DATA:
483	{
484	#ifdef VBOX_WITH_DRAG_AND_DROP_GH
485	if ( modeGet() == VBOX_DRAG_AND_DROP_MODE_BIDIRECTIONAL
486	\|\| modeGet() == VBOX_DRAG_AND_DROP_MODE_GUEST_TO_HOST)
487	rc = VINF_SUCCESS;
488	else
489	#endif
490	LogRel(("DnD: Guest -> Host mode disabled, ignoring request from guest\n"));
491	break;
492	}
493
494	default:
495	/* Reach through to DnD manager. */
496	rc = VINF_SUCCESS;
497	break;
498	}
499
500	#define DO_HOST_CALLBACK(); \
501	if ( RT_SUCCESS(rc) \
502	&& m_SvcCtx.pfnHostCallback) \
503	{ \
504	rc = m_SvcCtx.pfnHostCallback(m_SvcCtx.pvHostData, u32Function, &data, sizeof(data)); \
505	}
506
507	/*
508	* Lookup client.
509	*/
510	DragAndDropClient *pClient = NULL;
511
512	DnDClientMap::iterator itClient = m_clientMap.find(idClient);
513	if (itClient != m_clientMap.end())
514	{
515	pClient = itClient->second;
516	AssertPtr(pClient);
517	}
518	else
519	{
520	LogFunc(("Client %RU32 was not found\n", idClient));
521	rc = VERR_NOT_FOUND;
522	}
523
524	/* Verifies that an uint32 parameter has the expected buffer size set.
525	* Will set rc to VERR_INVALID_PARAMETER otherwise. See #9777. */
526	#define VERIFY_BUFFER_SIZE_UINT32(a_ParmUInt32, a_SizeExpected) \
527	do { \
528	uint32_t cbTemp = 0; \
529	rc = HGCMSvcGetU32(&a_ParmUInt32, &cbTemp); \
530	ASSERT_GUEST_BREAK(RT_SUCCESS(rc) && cbTemp == a_SizeExpected); \
531	} while (0)
532
533	/* Gets the context ID from the first parameter and store it into the data header.
534	* Then increments idxParm by one if more than one parameter is available. */
535	#define GET_CONTEXT_ID_PARM0() \
536	if (fHasCtxID) \
537	{ \
538	ASSERT_GUEST_BREAK(cParms >= 1); \
539	rc = HGCMSvcGetU32(&paParms[0], &data.hdr.uContextID); \
540	ASSERT_GUEST_BREAK(RT_SUCCESS(rc)); \
541	if (cParms > 1) \
542	idxParm++; \
543	}
544
545	if (rc == VINF_SUCCESS) /* Note: rc might be VINF_HGCM_ASYNC_EXECUTE! */
546	{
547	rc = VERR_INVALID_PARAMETER; /* Play safe by default. */
548
549	/* Whether the client's advertised protocol sends context IDs with commands. */
550	const bool fHasCtxID = pClient->uProtocolVerDeprecated >= 3;
551
552	/* Current parameter index to process. */
553	unsigned idxParm = 0;
554
555	switch (u32Function)
556	{
557	/*
558	* Note: Older VBox versions with enabled DnD guest->host support (< 5.0)
559	* used the same message ID (300) for GUEST_DND_FN_GET_NEXT_HOST_MSG and
560	* HOST_DND_FN_GH_REQ_PENDING, which led this service returning
561	* VERR_INVALID_PARAMETER when the guest wanted to actually
562	* handle HOST_DND_FN_GH_REQ_PENDING.
563	*/
564	case GUEST_DND_FN_GET_NEXT_HOST_MSG:
565	{
566	if (cParms == 3)
567	{
568	/* Make sure to increase the reference count so that the next message doesn't get removed between
569	* the guest's GUEST_DND_FN_GET_NEXT_HOST_MSG call and the actual message retrieval call. */
570	rc = m_pManager->GetNextMsgInfo(true /* fAddRef */,
571	&paParms[0].u.uint32 /* uMsg /, &paParms[1].u.uint32 / cParms */);
572	if (RT_FAILURE(rc)) /* No queued messages available? */
573	{
574	if (m_SvcCtx.pfnHostCallback) /* Try asking the host. */
575	{
576	VBOXDNDCBHGGETNEXTHOSTMSG data;
577	RT_ZERO(data);
578	data.hdr.uMagic = CB_MAGIC_DND_HG_GET_NEXT_HOST_MSG;
579	rc = m_SvcCtx.pfnHostCallback(m_SvcCtx.pvHostData, u32Function, &data, sizeof(data));
580	if (RT_SUCCESS(rc))
581	{
582	paParms[0].u.uint32 = data.uMsg; /* uMsg */
583	paParms[1].u.uint32 = data.cParms; /* cParms */
584	/* Note: paParms[2] was set by the guest as blocking flag. */
585	}
586
587	LogFlowFunc(("Host callback returned %Rrc\n", rc));
588	}
589	else /* No host callback in place, so drag and drop is not supported by the host. */
590	rc = VERR_NOT_SUPPORTED;
591
592	if (RT_FAILURE(rc))
593	rc = m_pManager->GetNextMsg(u32Function, cParms, paParms);
594
595	/* Some error occurred or no (new) messages available? */
596	if (RT_FAILURE(rc))
597	{
598	uint32_t fFlags = 0;
599	int rc2 = HGCMSvcGetU32(&paParms[2], &fFlags);
600	if ( RT_SUCCESS(rc2)
601	&& fFlags) /* Blocking flag set? */
602	{
603	/* Defer client returning. */
604	rc = VINF_HGCM_ASYNC_EXECUTE;
605	}
606	else
607	rc = VERR_INVALID_PARAMETER;
608
609	LogFlowFunc(("Message queue is empty, returning %Rrc to guest\n", rc));
610	}
611	}
612	}
613	break;
614	}
615	case GUEST_DND_FN_CONNECT:
616	{
617	ASSERT_GUEST_BREAK(cParms >= 2);
618
619	VBOXDNDCBCONNECTDATA data;
620	RT_ZERO(data);
621	data.hdr.uMagic = CB_MAGIC_DND_CONNECT;
622
623	rc = HGCMSvcGetU32(&paParms[idxParm++], &data.hdr.uContextID); \
624	ASSERT_GUEST_RC_BREAK(rc);
625	rc = HGCMSvcGetU32(&paParms[idxParm++], &data.uProtocolVersion);
626	ASSERT_GUEST_RC_BREAK(rc);
627	rc = HGCMSvcGetU32(&paParms[idxParm], &data.fFlags);
628	ASSERT_GUEST_RC_BREAK(rc);
629
630	unsigned uProtocolVer = 3; /* The protocol version we're going to use. */
631
632	/* Make sure we're only setting a protocl version we're supporting on the host. */
633	if (data.uProtocolVersion > uProtocolVer)
634	data.uProtocolVersion = uProtocolVer;
635
636	pClient->uProtocolVerDeprecated = data.uProtocolVersion;
637
638	/* Return the highest protocol version we're supporting. */
639	AssertBreak(idxParm);
640	ASSERT_GUEST_BREAK(idxParm);
641	paParms[idxParm - 1].u.uint32 = data.uProtocolVersion;
642
643	LogFlowFunc(("Client %RU32 is now using protocol v%RU32\n",
644	pClient->GetClientID(), pClient->uProtocolVerDeprecated));
645
646	DO_HOST_CALLBACK();
647	break;
648	}
649	case GUEST_DND_FN_REPORT_FEATURES:
650	{
651	rc = clientReportFeatures(pClient, cParms, paParms);
652	if (RT_SUCCESS(rc))
653	{
654	VBOXDNDCBREPORTFEATURESDATA data;
655	RT_ZERO(data);
656	data.hdr.uMagic = CB_MAGIC_DND_REPORT_FEATURES;
657
658	data.fGuestFeatures0 = pClient->fGuestFeatures0;
659	/* fGuestFeatures1 is not used yet. */
660
661	/* Don't touch initial rc. */
662	int rc2 = m_SvcCtx.pfnHostCallback(m_SvcCtx.pvHostData, u32Function, &data, sizeof(data));
663	AssertRC(rc2);
664	}
665	break;
666	}
667	case GUEST_DND_FN_QUERY_FEATURES:
668	{
669	rc = clientQueryFeatures(cParms, paParms);
670	break;
671	}
672	case GUEST_DND_FN_HG_ACK_OP:
673	{
674	ASSERT_GUEST_BREAK(cParms >= 2);
675
676	VBOXDNDCBHGACKOPDATA data;
677	RT_ZERO(data);
678	data.hdr.uMagic = CB_MAGIC_DND_HG_ACK_OP;
679
680	GET_CONTEXT_ID_PARM0();
681	rc = HGCMSvcGetU32(&paParms[idxParm], &data.uAction); /* Get drop action. */
682	ASSERT_GUEST_RC_BREAK(rc);
683
684	DO_HOST_CALLBACK();
685	break;
686	}
687	case GUEST_DND_FN_HG_REQ_DATA:
688	{
689	VBOXDNDCBHGREQDATADATA data;
690	RT_ZERO(data);
691	data.hdr.uMagic = CB_MAGIC_DND_HG_REQ_DATA;
692
693	switch (pClient->uProtocolVerDeprecated)
694	{
695	case 3:
696	{
697	ASSERT_GUEST_BREAK(cParms == 3);
698	GET_CONTEXT_ID_PARM0();
699	rc = HGCMSvcGetPv(&paParms[idxParm++], (void **)&data.pszFormat, &data.cbFormat);
700	ASSERT_GUEST_RC_BREAK(rc);
701	VERIFY_BUFFER_SIZE_UINT32(paParms[idxParm], data.cbFormat);
702	break;
703	}
704
705	case 2:
706	RT_FALL_THROUGH();
707	default:
708	{
709	ASSERT_GUEST_BREAK(cParms == 1);
710	rc = HGCMSvcGetPv(&paParms[idxParm], (void**)&data.pszFormat, &data.cbFormat);
711	ASSERT_GUEST_RC_BREAK(rc);
712	break;
713	}
714	}
715
716	DO_HOST_CALLBACK();
717	break;
718	}
719	case GUEST_DND_FN_HG_EVT_PROGRESS:
720	{
721	ASSERT_GUEST_BREAK(cParms >= 3);
722
723	VBOXDNDCBHGEVTPROGRESSDATA data;
724	RT_ZERO(data);
725	data.hdr.uMagic = CB_MAGIC_DND_HG_EVT_PROGRESS;
726
727	GET_CONTEXT_ID_PARM0();
728	rc = HGCMSvcGetU32(&paParms[idxParm++], &data.uStatus);
729	ASSERT_GUEST_RC_BREAK(rc);
730	rc = HGCMSvcGetU32(&paParms[idxParm++], &data.uPercentage);
731	ASSERT_GUEST_RC_BREAK(rc);
732	rc = HGCMSvcGetU32(&paParms[idxParm], &data.rc);
733	ASSERT_GUEST_RC_BREAK(rc);
734
735	DO_HOST_CALLBACK();
736	break;
737	}
738	#ifdef VBOX_WITH_DRAG_AND_DROP_GH
739	case GUEST_DND_FN_GH_ACK_PENDING:
740	{
741	VBOXDNDCBGHACKPENDINGDATA data;
742	RT_ZERO(data);
743	data.hdr.uMagic = CB_MAGIC_DND_GH_ACK_PENDING;
744
745	switch (pClient->uProtocolVerDeprecated)
746	{
747	case 3:
748	{
749	ASSERT_GUEST_BREAK(cParms == 5);
750	GET_CONTEXT_ID_PARM0();
751	rc = HGCMSvcGetU32(&paParms[idxParm++], &data.uDefAction);
752	ASSERT_GUEST_RC_BREAK(rc);
753	rc = HGCMSvcGetU32(&paParms[idxParm++], &data.uAllActions);
754	ASSERT_GUEST_RC_BREAK(rc);
755	rc = HGCMSvcGetPv(&paParms[idxParm++], (void**)&data.pszFormat, &data.cbFormat);
756	ASSERT_GUEST_RC_BREAK(rc);
757	VERIFY_BUFFER_SIZE_UINT32(paParms[idxParm], data.cbFormat);
758	break;
759	}
760
761	case 2:
762	default:
763	{
764	ASSERT_GUEST_BREAK(cParms == 3);
765	rc = HGCMSvcGetU32(&paParms[idxParm++], &data.uDefAction);
766	ASSERT_GUEST_RC_BREAK(rc);
767	rc = HGCMSvcGetU32(&paParms[idxParm++], &data.uAllActions);
768	ASSERT_GUEST_RC_BREAK(rc);
769	rc = HGCMSvcGetPv(&paParms[idxParm], (void**)&data.pszFormat, &data.cbFormat);
770	ASSERT_GUEST_RC_BREAK(rc);
771	break;
772	}
773	}
774
775	DO_HOST_CALLBACK();
776	break;
777	}
778	/* New since protocol v3. */
779	case GUEST_DND_FN_GH_SND_DATA_HDR:
780	{
781	ASSERT_GUEST_BREAK(cParms == 12);
782
783	VBOXDNDCBSNDDATAHDRDATA data;
784	RT_ZERO(data);
785	data.hdr.uMagic = CB_MAGIC_DND_GH_SND_DATA_HDR;
786
787	GET_CONTEXT_ID_PARM0();
788	rc = HGCMSvcGetU32(&paParms[idxParm++], &data.data.uFlags);
789	ASSERT_GUEST_RC_BREAK(rc);
790	rc = HGCMSvcGetU32(&paParms[idxParm++], &data.data.uScreenId);
791	ASSERT_GUEST_RC_BREAK(rc);
792	rc = HGCMSvcGetU64(&paParms[idxParm++], &data.data.cbTotal);
793	ASSERT_GUEST_RC_BREAK(rc);
794	rc = HGCMSvcGetU32(&paParms[idxParm++], &data.data.cbMeta);
795	ASSERT_GUEST_RC_BREAK(rc);
796	ASSERT_GUEST_BREAK(data.data.cbMeta <= data.data.cbTotal);
797	rc = HGCMSvcGetPv(&paParms[idxParm++], &data.data.pvMetaFmt, &data.data.cbMetaFmt);
798	ASSERT_GUEST_RC_BREAK(rc);
799	VERIFY_BUFFER_SIZE_UINT32(paParms[idxParm++], data.data.cbMetaFmt);
800	rc = HGCMSvcGetU64(&paParms[idxParm++], &data.data.cObjects);
801	ASSERT_GUEST_RC_BREAK(rc);
802	rc = HGCMSvcGetU32(&paParms[idxParm++], &data.data.enmCompression);
803	ASSERT_GUEST_RC_BREAK(rc);
804	rc = HGCMSvcGetU32(&paParms[idxParm++], (uint32_t *)&data.data.enmChecksumType);
805	ASSERT_GUEST_RC_BREAK(rc);
806	rc = HGCMSvcGetPv(&paParms[idxParm++], &data.data.pvChecksum, &data.data.cbChecksum);
807	ASSERT_GUEST_RC_BREAK(rc);
808	VERIFY_BUFFER_SIZE_UINT32(paParms[idxParm], data.data.cbChecksum);
809
810	DO_HOST_CALLBACK();
811	break;
812	}
813	case GUEST_DND_FN_GH_SND_DATA:
814	{
815	switch (pClient->uProtocolVerDeprecated)
816	{
817	case 3:
818	{
819	ASSERT_GUEST_BREAK(cParms == 5);
820
821	VBOXDNDCBSNDDATADATA data;
822	RT_ZERO(data);
823	data.hdr.uMagic = CB_MAGIC_DND_GH_SND_DATA;
824
825	GET_CONTEXT_ID_PARM0();
826	rc = HGCMSvcGetPv(&paParms[idxParm++], (void**)&data.data.u.v3.pvData, &data.data.u.v3.cbData);
827	ASSERT_GUEST_RC_BREAK(rc);
828	VERIFY_BUFFER_SIZE_UINT32(paParms[idxParm++], data.data.u.v3.cbData);
829	rc = HGCMSvcGetPv(&paParms[idxParm++], (void**)&data.data.u.v3.pvChecksum, &data.data.u.v3.cbChecksum);
830	ASSERT_GUEST_RC_BREAK(rc);
831	VERIFY_BUFFER_SIZE_UINT32(paParms[idxParm], data.data.u.v3.cbChecksum);
832
833	DO_HOST_CALLBACK();
834	break;
835	}
836
837	case 2:
838	RT_FALL_THROUGH();
839	default:
840	{
841	ASSERT_GUEST_BREAK(cParms == 2);
842
843	VBOXDNDCBSNDDATADATA data;
844	RT_ZERO(data);
845	data.hdr.uMagic = CB_MAGIC_DND_GH_SND_DATA;
846
847	rc = HGCMSvcGetPv(&paParms[idxParm++], (void**)&data.data.u.v1.pvData, &data.data.u.v1.cbData);
848	ASSERT_GUEST_RC_BREAK(rc);
849	rc = HGCMSvcGetU32(&paParms[idxParm], &data.data.u.v1.cbTotalSize);
850	ASSERT_GUEST_RC_BREAK(rc);
851
852	DO_HOST_CALLBACK();
853	break;
854	}
855	}
856	break;
857	}
858	case GUEST_DND_FN_GH_SND_DIR:
859	{
860	ASSERT_GUEST_BREAK(cParms >= 3);
861
862	VBOXDNDCBSNDDIRDATA data;
863	RT_ZERO(data);
864	data.hdr.uMagic = CB_MAGIC_DND_GH_SND_DIR;
865
866	GET_CONTEXT_ID_PARM0();
867	rc = HGCMSvcGetPv(&paParms[idxParm++], (void**)&data.pszPath, &data.cbPath);
868	ASSERT_GUEST_RC_BREAK(rc);
869	VERIFY_BUFFER_SIZE_UINT32(paParms[idxParm++], data.cbPath);
870	rc = HGCMSvcGetU32(&paParms[idxParm], &data.fMode);
871	ASSERT_GUEST_RC_BREAK(rc);
872
873	DO_HOST_CALLBACK();
874	break;
875	}
876	/* New since protocol v2 (>= VBox 5.0). */
877	case GUEST_DND_FN_GH_SND_FILE_HDR:
878	{
879	ASSERT_GUEST_BREAK(cParms == 6);
880
881	VBOXDNDCBSNDFILEHDRDATA data;
882	RT_ZERO(data);
883	data.hdr.uMagic = CB_MAGIC_DND_GH_SND_FILE_HDR;
884
885	GET_CONTEXT_ID_PARM0();
886	rc = HGCMSvcGetPv(&paParms[idxParm++], (void**)&data.pszFilePath, &data.cbFilePath);
887	ASSERT_GUEST_RC_BREAK(rc);
888	VERIFY_BUFFER_SIZE_UINT32(paParms[idxParm++], data.cbFilePath);
889	rc = HGCMSvcGetU32(&paParms[idxParm++], &data.fFlags);
890	ASSERT_GUEST_RC_BREAK(rc);
891	rc = HGCMSvcGetU32(&paParms[idxParm++], &data.fMode);
892	ASSERT_GUEST_RC_BREAK(rc);
893	rc = HGCMSvcGetU64(&paParms[idxParm], &data.cbSize);
894	ASSERT_GUEST_RC_BREAK(rc);
895
896	DO_HOST_CALLBACK();
897	break;
898	}
899	case GUEST_DND_FN_GH_SND_FILE_DATA:
900	{
901	switch (pClient->uProtocolVerDeprecated)
902	{
903	/* Protocol v3 adds (optional) checksums. */
904	case 3:
905	{
906	ASSERT_GUEST_BREAK(cParms == 5);
907
908	VBOXDNDCBSNDFILEDATADATA data;
909	RT_ZERO(data);
910	data.hdr.uMagic = CB_MAGIC_DND_GH_SND_FILE_DATA;
911
912	GET_CONTEXT_ID_PARM0();
913	rc = HGCMSvcGetPv(&paParms[idxParm++], (void**)&data.pvData, &data.cbData);
914	ASSERT_GUEST_RC_BREAK(rc);
915	VERIFY_BUFFER_SIZE_UINT32(paParms[idxParm++], data.cbData);
916	rc = HGCMSvcGetPv(&paParms[idxParm++], (void**)&data.u.v3.pvChecksum, &data.u.v3.cbChecksum);
917	ASSERT_GUEST_RC_BREAK(rc);
918	VERIFY_BUFFER_SIZE_UINT32(paParms[idxParm], data.u.v3.cbChecksum);
919
920	DO_HOST_CALLBACK();
921	break;
922	}
923	/* Protocol v2 only sends the next data chunks to reduce traffic. */
924	case 2:
925	{
926	ASSERT_GUEST_BREAK(cParms == 3);
927
928	VBOXDNDCBSNDFILEDATADATA data;
929	RT_ZERO(data);
930	data.hdr.uMagic = CB_MAGIC_DND_GH_SND_FILE_DATA;
931
932	GET_CONTEXT_ID_PARM0();
933	rc = HGCMSvcGetPv(&paParms[idxParm++], (void**)&data.pvData, &data.cbData);
934	ASSERT_GUEST_RC_BREAK(rc);
935	VERIFY_BUFFER_SIZE_UINT32(paParms[idxParm], data.cbData);
936
937	DO_HOST_CALLBACK();
938	break;
939	}
940	/* Protocol v1 sends the file path and attributes for every file chunk (!). */
941	default:
942	{
943	ASSERT_GUEST_BREAK(cParms == 5);
944
945	VBOXDNDCBSNDFILEDATADATA data;
946	RT_ZERO(data);
947	data.hdr.uMagic = CB_MAGIC_DND_GH_SND_FILE_DATA;
948
949	rc = HGCMSvcGetPv(&paParms[idxParm++], (void**)&data.u.v1.pszFilePath, &data.u.v1.cbFilePath);
950	ASSERT_GUEST_RC_BREAK(rc);
951	VERIFY_BUFFER_SIZE_UINT32(paParms[idxParm++], data.u.v1.cbFilePath);
952	rc = HGCMSvcGetPv(&paParms[idxParm++], (void**)&data.pvData, &data.cbData);
953	ASSERT_GUEST_RC_BREAK(rc);
954	VERIFY_BUFFER_SIZE_UINT32(paParms[idxParm++], data.cbData);
955	rc = HGCMSvcGetU32(&paParms[idxParm], &data.u.v1.fMode);
956	ASSERT_GUEST_RC_BREAK(rc);
957
958	DO_HOST_CALLBACK();
959	break;
960	}
961	}
962	break;
963	}
964	case GUEST_DND_FN_EVT_ERROR:
965	{
966	ASSERT_GUEST_BREAK(cParms >= 1);
967
968	VBOXDNDCBEVTERRORDATA data;
969	RT_ZERO(data);
970	data.hdr.uMagic = CB_MAGIC_DND_EVT_ERROR;
971
972	GET_CONTEXT_ID_PARM0();
973	rc = HGCMSvcGetU32(&paParms[idxParm], (uint32_t *)&data.rc);
974	ASSERT_GUEST_RC_BREAK(rc);
975
976	DO_HOST_CALLBACK();
977	break;
978	}
979	#endif /* VBOX_WITH_DRAG_AND_DROP_GH */
980
981	default:
982	{
983	LogFlowFunc(("u32Function=%s (%#x), cParms=%RU32\n", DnDHostMsgToStr(u32Function), u32Function, cParms));
984
985	/* All other messages are handled by the DnD manager. */
986	rc = m_pManager->GetNextMsg(u32Function, cParms, paParms);
987	if (rc == VERR_NO_DATA) /* Manager has no new messsages? Try asking the host. */
988	{
989	if (m_SvcCtx.pfnHostCallback)
990	{
991	VBOXDNDCBHGGETNEXTHOSTMSGDATA data;
992	RT_ZERO(data);
993
994	data.hdr.uMagic = VBOX_DND_CB_MAGIC_MAKE(0 /* uFn /, 0 / uVer */);
995
996	data.uMsg = u32Function;
997	data.cParms = cParms;
998	data.paParms = paParms;
999
1000	rc = m_SvcCtx.pfnHostCallback(m_SvcCtx.pvHostData, u32Function, &data, sizeof(data));
1001	if (RT_SUCCESS(rc))
1002	{
1003	cParms = data.cParms;
1004	paParms = data.paParms;
1005	}
1006	else
1007	{
1008	if (rc == VERR_CANCELLED)
1009	{
1010	/* Host indicated that the current operation was cancelled. Tell the guest. */
1011	LogFunc(("Host indicated that operation was cancelled\n"));
1012	}
1013	else
1014	{
1015	/*
1016	* In case the guest is too fast asking for the next message
1017	* and the host did not supply it yet, just defer the client's
1018	* return until a response from the host available.
1019	*/
1020	LogFunc(("No new messages from the host (%Rrc), deferring request\n", rc));
1021	rc = VINF_HGCM_ASYNC_EXECUTE;
1022	}
1023	}
1024	}
1025	else /* No host callback in place, so drag and drop is not supported by the host. */
1026	rc = VERR_NOT_SUPPORTED;
1027	}
1028	break;
1029	}
1030	}
1031	}
1032
1033	#undef VERIFY_BUFFER_SIZE_UINT32
1034
1035	/*
1036	* If async execution is requested, we didn't notify the guest yet about
1037	* completion. The client is queued into the waiters list and will be
1038	* notified as soon as a new event is available.
1039	*/
1040	if (rc == VINF_HGCM_ASYNC_EXECUTE)
1041	{
1042	LogFunc(("Deferring client %RU32\n", idClient));
1043
1044	try
1045	{
1046	AssertPtr(pClient);
1047	pClient->SetDeferred(callHandle, u32Function, cParms, paParms);
1048	m_clientQueue.push_back(idClient);
1049	}
1050	catch (std::bad_alloc &)
1051	{
1052	rc = VERR_NO_MEMORY;
1053	/* Don't report to guest. */
1054	}
1055	}
1056	else if (pClient)
1057	{
1058	/* Complete the call on the guest side. */
1059	pClient->Complete(callHandle, rc);
1060	}
1061	else
1062	{
1063	AssertMsgFailed(("Guest call failed with %Rrc\n", rc));
1064	rc = VERR_NOT_IMPLEMENTED;
1065	}
1066
1067	LogFunc(("Returning %Rrc to guest\n", rc));
1068	}
1069
1070	int DragAndDropService::hostCall(uint32_t u32Function,
1071	uint32_t cParms, VBOXHGCMSVCPARM paParms[]) RT_NOEXCEPT
1072	{
1073	LogFlowFunc(("u32Function=%s (%#x), cParms=%RU32, cClients=%zu, cQueue=%zu\n",
1074	DnDHostMsgToStr(u32Function), u32Function, cParms, m_clientMap.size(), m_clientQueue.size()));
1075
1076	uint32_t const uMode = modeGet();
1077
1078	/* Check if we've the right mode set. */
1079	int rc = VERR_ACCESS_DENIED; /* Play safe. */
1080	switch (u32Function)
1081	{
1082	/*
1083	* Host -> Guest mode
1084	*/
1085	case HOST_DND_FN_HG_EVT_ENTER:
1086	RT_FALL_THROUGH();
1087	case HOST_DND_FN_HG_EVT_MOVE:
1088	RT_FALL_THROUGH();
1089	case HOST_DND_FN_HG_EVT_LEAVE:
1090	RT_FALL_THROUGH();
1091	case HOST_DND_FN_HG_EVT_DROPPED:
1092	RT_FALL_THROUGH();
1093	case HOST_DND_FN_HG_SND_DATA_HDR:
1094	RT_FALL_THROUGH();
1095	case HOST_DND_FN_HG_SND_DATA:
1096	RT_FALL_THROUGH();
1097	case HOST_DND_FN_HG_SND_MORE_DATA:
1098	RT_FALL_THROUGH();
1099	case HOST_DND_FN_HG_SND_DIR:
1100	RT_FALL_THROUGH();
1101	case HOST_DND_FN_HG_SND_FILE_DATA:
1102	RT_FALL_THROUGH();
1103	case HOST_DND_FN_HG_SND_FILE_HDR:
1104	{
1105	if ( uMode == VBOX_DRAG_AND_DROP_MODE_HOST_TO_GUEST
1106	\|\| uMode == VBOX_DRAG_AND_DROP_MODE_BIDIRECTIONAL)
1107	rc = VINF_SUCCESS;
1108	else
1109	{
1110	LogRel2(("DnD: Host to guest mode is disabled, ignoring request from host\n"));
1111	}
1112	break;
1113	}
1114
1115	/*
1116	* Guest -> Host mode
1117	*/
1118	case HOST_DND_FN_GH_REQ_PENDING:
1119	RT_FALL_THROUGH();
1120	case HOST_DND_FN_GH_EVT_DROPPED:
1121	{
1122	if ( uMode == VBOX_DRAG_AND_DROP_MODE_GUEST_TO_HOST
1123	\|\| uMode == VBOX_DRAG_AND_DROP_MODE_BIDIRECTIONAL)
1124	rc = VINF_SUCCESS;
1125	else
1126	{
1127	LogRel2(("DnD: Guest to host mode is disabled, ignoring request from host\n"));
1128	}
1129	break;
1130	}
1131
1132	/*
1133	* Both modes
1134	*/
1135	case HOST_DND_FN_CANCEL:
1136	if (uMode != VBOX_DRAG_AND_DROP_MODE_OFF)
1137	rc = VINF_SUCCESS;
1138	break;
1139
1140	/*
1141	* Functions that always work.
1142	*/
1143	case HOST_DND_FN_SET_MODE:
1144	rc = VINF_SUCCESS;
1145	break;
1146
1147	/*
1148	* Forbid everything else not explicitly allowed.
1149	*/
1150	default:
1151	break;
1152	}
1153
1154	if (RT_FAILURE(rc))
1155	return rc;
1156
1157	bool fSendToGuest = false; /* Whether to send the message down to the guest side or not. */
1158
1159	switch (u32Function)
1160	{
1161	case HOST_DND_FN_SET_MODE:
1162	{
1163	if (cParms != 1)
1164	rc = VERR_INVALID_PARAMETER;
1165	else if (paParms[0].type != VBOX_HGCM_SVC_PARM_32BIT)
1166	rc = VERR_INVALID_PARAMETER;
1167	else
1168	rc = modeSet(paParms[0].u.uint32);
1169	break;
1170	}
1171
1172	case HOST_DND_FN_CANCEL:
1173	{
1174	LogFlowFunc(("Cancelling all waiting clients ...\n"));
1175
1176	/* Forcefully reset the message queue, as the host has cancelled the current operation. */
1177	m_pManager->Reset(true /* fForce */);
1178
1179	/*
1180	* Wake up all deferred clients and tell them to process
1181	* the cancelling message next.
1182	*/
1183	DnDClientQueue::iterator itQueue = m_clientQueue.begin();
1184	while (itQueue != m_clientQueue.end())
1185	{
1186	DnDClientMap::iterator itClient = m_clientMap.find(*itQueue);
1187	Assert(itClient != m_clientMap.end());
1188
1189	DragAndDropClient *pClient = itClient->second;
1190	AssertPtr(pClient);
1191
1192	int rc2 = pClient->SetDeferredMsgInfo(HOST_DND_FN_CANCEL,
1193	/* Protocol v3+ also contains the context ID. */
1194	pClient->uProtocolVerDeprecated >= 3 ? 1 : 0);
1195	AssertRC(rc2);
1196
1197	/* Return VERR_CANCELLED when waking up the guest side. */
1198	pClient->CompleteDeferred(VERR_CANCELLED);
1199
1200	m_clientQueue.erase(itQueue);
1201	itQueue = m_clientQueue.begin();
1202	}
1203
1204	Assert(m_clientQueue.empty());
1205
1206	/* Tell the host that everything went well. */
1207	rc = VINF_SUCCESS;
1208	break;
1209	}
1210
1211	case HOST_DND_FN_HG_EVT_ENTER:
1212	{
1213	/* Reset the message queue as a new DnD operation just began. */
1214	m_pManager->Reset(false /* fForce */);
1215
1216	fSendToGuest = true;
1217	rc = VINF_SUCCESS;
1218	break;
1219	}
1220
1221	default:
1222	{
1223	fSendToGuest = true;
1224	rc = VINF_SUCCESS;
1225	break;
1226	}
1227	}
1228
1229	do /* goto avoidance break-loop. */
1230	{
1231	if (fSendToGuest)
1232	{
1233	if (m_clientMap.empty()) /* At least one client on the guest connected? */
1234	{
1235	/*
1236	* Tell the host that the guest does not support drag'n drop.
1237	* This might happen due to not installed Guest Additions or
1238	* not running VBoxTray/VBoxClient.
1239	*/
1240	rc = VERR_NOT_SUPPORTED;
1241	break;
1242	}
1243
1244	rc = m_pManager->AddMsg(u32Function, cParms, paParms, true /* fAppend */);
1245	if (RT_FAILURE(rc))
1246	{
1247	AssertMsgFailed(("Adding new message of type=%RU32 failed with rc=%Rrc\n", u32Function, rc));
1248	break;
1249	}
1250
1251	/* Any clients in our queue ready for processing the next command? */
1252	if (m_clientQueue.empty())
1253	{
1254	LogFlowFunc(("All clients (%zu) busy -- delaying execution\n", m_clientMap.size()));
1255	break;
1256	}
1257
1258	uint32_t uClientNext = m_clientQueue.front();
1259	DnDClientMap::iterator itClientNext = m_clientMap.find(uClientNext);
1260	Assert(itClientNext != m_clientMap.end());
1261
1262	DragAndDropClient *pClient = itClientNext->second;
1263	AssertPtr(pClient);
1264
1265	/*
1266	* Check if this was a request for getting the next host
1267	* message. If so, return the message ID and the parameter
1268	* count. The message itself has to be queued.
1269	*/
1270	uint32_t uMsgClient = pClient->GetMsgType();
1271
1272	uint32_t uMsgNext = 0;
1273	uint32_t cParmsNext = 0;
1274	/* Note: We only want to peek for the next message, hence fAddRef is false. */
1275	int rcNext = m_pManager->GetNextMsgInfo(false /* fAddRef */, &uMsgNext, &cParmsNext);
1276
1277	LogFlowFunc(("uMsgClient=%s (%#x), uMsgNext=%s (%#x), cParmsNext=%RU32, rcNext=%Rrc\n",
1278	DnDGuestMsgToStr(uMsgClient), uMsgClient, DnDHostMsgToStr(uMsgNext), uMsgNext, cParmsNext, rcNext));
1279
1280	if (RT_SUCCESS(rcNext))
1281	{
1282	if (uMsgClient == GUEST_DND_FN_GET_NEXT_HOST_MSG)
1283	{
1284	rc = pClient->SetDeferredMsgInfo(uMsgNext, cParmsNext);
1285
1286	/* Note: Report the current rc back to the guest. */
1287	pClient->CompleteDeferred(rc);
1288	}
1289	/*
1290	* Does the message the client is waiting for match the message
1291	* next in the queue? Process it right away then.
1292	*/
1293	else if (uMsgClient == uMsgNext)
1294	{
1295	rc = m_pManager->GetNextMsg(u32Function, cParms, paParms);
1296
1297	/* Note: Report the current rc back to the guest. */
1298	pClient->CompleteDeferred(rc);
1299	}
1300	else /* Should not happen; cancel the operation on the guest. */
1301	{
1302	LogFunc(("Client ID=%RU32 in wrong state with uMsg=%RU32 (next message in queue: %RU32), cancelling\n",
1303	pClient->GetClientID(), uMsgClient, uMsgNext));
1304
1305	pClient->CompleteDeferred(VERR_CANCELLED);
1306	}
1307
1308	m_clientQueue.pop_front();
1309	}
1310
1311	} /* fSendToGuest */
1312
1313	} while (0); /* To use breaks. */
1314
1315	LogFlowFuncLeaveRC(rc);
1316	return rc;
1317	}
1318
1319	DECLCALLBACK(int) DragAndDropService::progressCallback(uint32_t uStatus, uint32_t uPercentage, int rc, void *pvUser)
1320	{
1321	AssertPtrReturn(pvUser, VERR_INVALID_POINTER);
1322
1323	DragAndDropService pSelf = static_cast<DragAndDropService >(pvUser);
1324	AssertPtr(pSelf);
1325
1326	if (pSelf->m_SvcCtx.pfnHostCallback)
1327	{
1328	LogFlowFunc(("GUEST_DND_FN_HG_EVT_PROGRESS: uStatus=%RU32, uPercentage=%RU32, rc=%Rrc\n",
1329	uStatus, uPercentage, rc));
1330
1331	VBOXDNDCBHGEVTPROGRESSDATA data;
1332	data.hdr.uMagic = CB_MAGIC_DND_HG_EVT_PROGRESS;
1333	data.uPercentage = RT_MIN(uPercentage, 100);
1334	data.uStatus = uStatus;
1335	data.rc = rc; /** @todo uin32_t vs. int. */
1336
1337	return pSelf->m_SvcCtx.pfnHostCallback(pSelf->m_SvcCtx.pvHostData,
1338	GUEST_DND_FN_HG_EVT_PROGRESS,
1339	&data, sizeof(data));
1340	}
1341
1342	return VINF_SUCCESS;
1343	}
1344
1345	/**
1346	* @copydoc FNVBOXHGCMSVCLOAD
1347	*/
1348	extern "C" DECLCALLBACK(DECLEXPORT(int)) VBoxHGCMSvcLoad(VBOXHGCMSVCFNTABLE *pTable)
1349	{
1350	return DragAndDropService::svcLoad(pTable);
1351	}
1352

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source: vbox/trunk/src/VBox/HostServices/DragAndDrop/VBoxDragAndDropSvc.cpp@ 100682

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