service.cpp@ 72075

Last change on this file since 72075 was 71431, checked in by vboxsync, 7 years ago
Guest Control/service: Partly reverted r121279 (also let the host know that the current message has been skipped.), not needed.
Property svn:eol-style set to `native` Property svn:keywords set to `Author Date Id Revision`
File size: 58.7 KB

Line
1	/* $Id: service.cpp 71431 2018-03-21 13:30:12Z vboxsync $ */
2	/** @file
3	* Guest Control Service: Controlling the guest.
4	*/
5
6	/*
7	* Copyright (C) 2011-2018 Oracle Corporation
8	*
9	* This file is part of VirtualBox Open Source Edition (OSE), as
10	* available from http://www.virtualbox.org. This file is free software;
11	* you can redistribute it and/or modify it under the terms of the GNU
12	* General Public License (GPL) as published by the Free Software
13	* Foundation, in version 2 as it comes in the "COPYING" file of the
14	* VirtualBox OSE distribution. VirtualBox OSE is distributed in the
15	* hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
16	*/
17
18	/** @page pg_svc_guest_control Guest Control HGCM Service
19	*
20	* This service acts as a proxy for handling and buffering host command requests
21	* and clients on the guest. It tries to be as transparent as possible to let
22	* the guest (client) and host side do their protocol handling as desired.
23	*
24	* The following terms are used:
25	* - Host: A host process (e.g. VBoxManage or another tool utilizing the Main API)
26	* which wants to control something on the guest.
27	* - Client: A client (e.g. VBoxService) running inside the guest OS waiting for
28	* new host commands to perform. There can be multiple clients connected
29	* to this service. A client is represented by its unique HGCM client ID.
30	* - Context ID: An (almost) unique ID automatically generated on the host (Main API)
31	* to not only distinguish clients but individual requests. Because
32	* the host does not know anything about connected clients it needs
33	* an indicator which it can refer to later. This context ID gets
34	* internally bound by the service to a client which actually processes
35	* the command in order to have a relationship between client<->context ID(s).
36	*
37	* The host can trigger commands which get buffered by the service (with full HGCM
38	* parameter info). As soon as a client connects (or is ready to do some new work)
39	* it gets a buffered host command to process it. This command then will be immediately
40	* removed from the command list. If there are ready clients but no new commands to be
41	* processed, these clients will be set into a deferred state (that is being blocked
42	* to return until a new command is available).
43	*
44	* If a client needs to inform the host that something happened, it can send a
45	* message to a low level HGCM callback registered in Main. This callback contains
46	* the actual data as well as the context ID to let the host do the next necessary
47	* steps for this context. This context ID makes it possible to wait for an event
48	* inside the host's Main API function (like starting a process on the guest and
49	* wait for getting its PID returned by the client) as well as cancelling blocking
50	* host calls in order the client terminated/crashed (HGCM detects disconnected
51	* clients and reports it to this service's callback).
52	*
53	* Starting at VBox 4.2 the context ID itself consists of a session ID, an object
54	* ID (for example a process or file ID) and a count. This is necessary to not break
55	* compatibility between older hosts and to manage guest session on the host.
56	*/
57
58
59	/*********************************************************************************************************************************
60	* Header Files *
61	*********************************************************************************************************************************/
62	#ifdef LOG_GROUP
63	#undef LOG_GROUP
64	#endif
65	#define LOG_GROUP LOG_GROUP_GUEST_CONTROL
66	#include <VBox/HostServices/GuestControlSvc.h>
67
68	#include <VBox/log.h>
69	#include <iprt/assert.h>
70	#include <iprt/cpp/autores.h>
71	#include <iprt/cpp/utils.h>
72	#include <iprt/err.h>
73	#include <iprt/mem.h>
74	#include <iprt/list.h>
75	#include <iprt/req.h>
76	#include <iprt/string.h>
77	#include <iprt/thread.h>
78	#include <iprt/time.h>
79
80	#include <map>
81	#include <memory> /* for auto_ptr */
82	#include <string>
83	#include <list>
84
85
86	namespace guestControl {
87
88	/** Flag for indicating that the client only is interested in
89	* messages of specific context IDs. */
90	#define CLIENTSTATE_FLAG_CONTEXTFILTER RT_BIT(0)
91
92	/**
93	* Structure for maintaining a pending (that is, a deferred and not yet completed)
94	* client command.
95	*/
96	typedef struct ClientConnection
97	{
98	/** The call handle */
99	VBOXHGCMCALLHANDLE mHandle;
100	/** Number of parameters */
101	uint32_t mNumParms;
102	/** The call parameters */
103	VBOXHGCMSVCPARM *mParms;
104	/** The standard constructor. */
105	ClientConnection(void)
106	: mHandle(0), mNumParms(0), mParms(NULL) {}
107	} ClientConnection;
108
109	/**
110	* Structure for holding a buffered host command which has
111	* not been processed yet.
112	*/
113	typedef struct HostCommand
114	{
115	RTLISTNODE Node;
116
117	uint32_t AddRef(void)
118	{
119	#ifdef DEBUG_andy
120	LogFlowThisFunc(("[Cmd %RU32] Adding reference, new refCount=%RU32\n", mMsgType, mRefCount + 1));
121	#endif
122	return ++mRefCount;
123	}
124
125	uint32_t Release(void)
126	{
127	#ifdef DEBUG_andy
128	LogFlowThisFunc(("[Cmd %RU32] Releasing reference, new refCount=%RU32\n", mMsgType, mRefCount - 1));
129	#endif
130	/* Release reference for current command. */
131	Assert(mRefCount);
132	if (--mRefCount == 0)
133	Free();
134
135	return mRefCount;
136	}
137
138	/**
139	* Allocates the command with an HGCM request. Needs to be free'd using Free().
140	*
141	* @return IPRT status code.
142	* @param uMsg Message type.
143	* @param cParms Number of parameters of HGCM request.
144	* @param paParms Array of parameters of HGCM request.
145	*/
146	int Allocate(uint32_t uMsg, uint32_t cParms, VBOXHGCMSVCPARM paParms[])
147	{
148	LogFlowThisFunc(("[Cmd %RU32] Allocating cParms=%RU32, paParms=%p\n", uMsg, cParms, paParms));
149
150	if (!cParms) /* At least one parameter (context ID) must be present. */
151	return VERR_INVALID_PARAMETER;
152
153	AssertPtrReturn(paParms, VERR_INVALID_POINTER);
154
155	/* Paranoia. */
156	if (cParms > 256)
157	cParms = 256;
158
159	int rc = VINF_SUCCESS;
160
161	/*
162	* Don't verify anything here (yet), because this function only buffers
163	* the HGCM data into an internal structure and reaches it back to the guest (client)
164	* in an unmodified state.
165	*/
166	mMsgType = uMsg;
167	mParmCount = cParms;
168	if (mParmCount)
169	{
170	mpParms = (VBOXHGCMSVCPARM)RTMemAllocZ(sizeof(VBOXHGCMSVCPARM) mParmCount);
171	if (NULL == mpParms)
172	rc = VERR_NO_MEMORY;
173	}
174
175	if (RT_SUCCESS(rc))
176	{
177	for (uint32_t i = 0; i < mParmCount; i++)
178	{
179	mpParms[i].type = paParms[i].type;
180	switch (paParms[i].type)
181	{
182	case VBOX_HGCM_SVC_PARM_32BIT:
183	mpParms[i].u.uint32 = paParms[i].u.uint32;
184	break;
185
186	case VBOX_HGCM_SVC_PARM_64BIT:
187	mpParms[i].u.uint64 = paParms[i].u.uint64;
188	break;
189
190	case VBOX_HGCM_SVC_PARM_PTR:
191	mpParms[i].u.pointer.size = paParms[i].u.pointer.size;
192	if (mpParms[i].u.pointer.size > 0)
193	{
194	mpParms[i].u.pointer.addr = RTMemAlloc(mpParms[i].u.pointer.size);
195	if (NULL == mpParms[i].u.pointer.addr)
196	{
197	rc = VERR_NO_MEMORY;
198	break;
199	}
200	else
201	memcpy(mpParms[i].u.pointer.addr,
202	paParms[i].u.pointer.addr,
203	mpParms[i].u.pointer.size);
204	}
205	else
206	{
207	/* Size is 0 -- make sure we don't have any pointer. */
208	mpParms[i].u.pointer.addr = NULL;
209	}
210	break;
211
212	default:
213	break;
214	}
215	if (RT_FAILURE(rc))
216	break;
217	}
218	}
219
220	if (RT_SUCCESS(rc))
221	{
222	/*
223	* Assume that the context ID always is the first parameter,
224	* assign the context ID to the command.
225	*/
226	rc = mpParms[0].getUInt32(&mContextID);
227
228	/* Set timestamp so that clients can distinguish between already
229	* processed commands and new ones. */
230	mTimestamp = RTTimeNanoTS();
231	}
232
233	LogFlowFunc(("Returned with rc=%Rrc\n", rc));
234	return rc;
235	}
236
237	/**
238	* Frees the buffered HGCM request.
239	*
240	* @return IPRT status code.
241	*/
242	void Free(void)
243	{
244	AssertMsg(mRefCount == 0, ("uMsg=%RU32, CID=%RU32 still being used by a client (%RU32 refs), cannot free yet\n",
245	mMsgType, mContextID, mRefCount));
246
247	LogFlowThisFunc(("[Cmd %RU32] Freeing\n", mMsgType));
248
249	for (uint32_t i = 0; i < mParmCount; i++)
250	{
251	switch (mpParms[i].type)
252	{
253	case VBOX_HGCM_SVC_PARM_PTR:
254	if (mpParms[i].u.pointer.size > 0)
255	RTMemFree(mpParms[i].u.pointer.addr);
256	break;
257
258	default:
259	break;
260	}
261	}
262
263	if (mpParms)
264	{
265	RTMemFree(mpParms);
266	mpParms = NULL;
267	}
268
269	mParmCount = 0;
270
271	/* Removes the command from its list */
272	RTListNodeRemove(&Node);
273	}
274
275	/**
276	* Copies data from the buffered HGCM request to the current HGCM request.
277	*
278	* @return IPRT status code.
279	* @param paDstParms Array of parameters of HGCM request to fill the data into.
280	* @param cDstParms Number of parameters the HGCM request can handle.
281	*/
282	int CopyTo(VBOXHGCMSVCPARM paDstParms[], uint32_t cDstParms) const
283	{
284	LogFlowThisFunc(("[Cmd %RU32] mParmCount=%RU32, mContextID=%RU32 (Session %RU32)\n",
285	mMsgType, mParmCount, mContextID, VBOX_GUESTCTRL_CONTEXTID_GET_SESSION(mContextID)));
286
287	int rc = VINF_SUCCESS;
288	if (cDstParms != mParmCount)
289	{
290	LogFlowFunc(("Parameter count does not match (got %RU32, expected %RU32)\n",
291	cDstParms, mParmCount));
292	rc = VERR_INVALID_PARAMETER;
293	}
294
295	if (RT_SUCCESS(rc))
296	{
297	for (uint32_t i = 0; i < mParmCount; i++)
298	{
299	if (paDstParms[i].type != mpParms[i].type)
300	{
301	LogFlowFunc(("Parameter %RU32 type mismatch (got %RU32, expected %RU32)\n",
302	i, paDstParms[i].type, mpParms[i].type));
303	rc = VERR_INVALID_PARAMETER;
304	}
305	else
306	{
307	switch (mpParms[i].type)
308	{
309	case VBOX_HGCM_SVC_PARM_32BIT:
310	#ifdef DEBUG_andy
311	LogFlowFunc(("\tmpParms[%RU32] = %RU32 (uint32_t)\n",
312	i, mpParms[i].u.uint32));
313	#endif
314	paDstParms[i].u.uint32 = mpParms[i].u.uint32;
315	break;
316
317	case VBOX_HGCM_SVC_PARM_64BIT:
318	#ifdef DEBUG_andy
319	LogFlowFunc(("\tmpParms[%RU32] = %RU64 (uint64_t)\n",
320	i, mpParms[i].u.uint64));
321	#endif
322	paDstParms[i].u.uint64 = mpParms[i].u.uint64;
323	break;
324
325	case VBOX_HGCM_SVC_PARM_PTR:
326	{
327	#ifdef DEBUG_andy
328	LogFlowFunc(("\tmpParms[%RU32] = %p (ptr), size = %RU32\n",
329	i, mpParms[i].u.pointer.addr, mpParms[i].u.pointer.size));
330	#endif
331	if (!mpParms[i].u.pointer.size)
332	continue; /* Only copy buffer if there actually is something to copy. */
333
334	if (!paDstParms[i].u.pointer.addr)
335	rc = VERR_INVALID_PARAMETER;
336
337	if ( RT_SUCCESS(rc)
338	&& paDstParms[i].u.pointer.size < mpParms[i].u.pointer.size)
339	rc = VERR_BUFFER_OVERFLOW;
340
341	if (RT_SUCCESS(rc))
342	{
343	memcpy(paDstParms[i].u.pointer.addr,
344	mpParms[i].u.pointer.addr,
345	mpParms[i].u.pointer.size);
346	}
347
348	break;
349	}
350
351	default:
352	LogFlowFunc(("Parameter %RU32 of type %RU32 is not supported yet\n",
353	i, mpParms[i].type));
354	rc = VERR_NOT_SUPPORTED;
355	break;
356	}
357	}
358
359	if (RT_FAILURE(rc))
360	{
361	LogFlowFunc(("Parameter %RU32 invalid (%Rrc), refusing\n",
362	i, rc));
363	break;
364	}
365	}
366	}
367
368	LogFlowFunc(("Returned with rc=%Rrc\n", rc));
369	return rc;
370	}
371
372	int Assign(const ClientConnection *pConnection)
373	{
374	AssertPtrReturn(pConnection, VERR_INVALID_POINTER);
375
376	int rc;
377
378	LogFlowThisFunc(("[Cmd %RU32] mParmCount=%RU32, mpParms=%p\n", mMsgType, mParmCount, mpParms));
379
380	/* Does the current host command need more parameter space which
381	* the client does not provide yet? */
382	if (mParmCount > pConnection->mNumParms)
383	{
384	LogFlowThisFunc(("[Cmd %RU32] Requires %RU32 parms, only got %RU32 from client\n",
385	mMsgType, mParmCount, pConnection->mNumParms));
386	/*
387	* So this call apparently failed because the guest wanted to peek
388	* how much parameters it has to supply in order to successfully retrieve
389	* this command. Let's tell him so!
390	*/
391	rc = VERR_TOO_MUCH_DATA;
392	}
393	else
394	{
395	rc = CopyTo(pConnection->mParms, pConnection->mNumParms);
396
397	/*
398	* Has there been enough parameter space but the wrong parameter types
399	* were submitted -- maybe the client was just asking for the next upcoming
400	* host message?
401	*
402	* Note: To keep this compatible to older clients we return VERR_TOO_MUCH_DATA
403	* in every case.
404	*/
405	if (RT_FAILURE(rc))
406	rc = VERR_TOO_MUCH_DATA;
407	}
408
409	return rc;
410	}
411
412	int Peek(const ClientConnection *pConnection)
413	{
414	AssertPtrReturn(pConnection, VERR_INVALID_POINTER);
415
416	LogFlowThisFunc(("[Cmd %RU32] mParmCount=%RU32, mpParms=%p\n", mMsgType, mParmCount, mpParms));
417
418	if (pConnection->mNumParms >= 2)
419	{
420	pConnection->mParms[0].setUInt32(mMsgType); /* Message ID */
421	pConnection->mParms[1].setUInt32(mParmCount); /* Required parameters for message */
422	}
423	else
424	LogFlowThisFunc(("Warning: Client has not (yet) submitted enough parameters (%RU32, must be at least 2) to at least peak for the next message\n",
425	pConnection->mNumParms));
426
427	/*
428	* Always return VERR_TOO_MUCH_DATA data here to
429	* keep it compatible with older clients and to
430	* have correct accounting (mHostRc + mHostCmdTries).
431	*/
432	return VERR_TOO_MUCH_DATA;
433	}
434
435	/** Reference count for keeping track how many connected
436	* clients still need to process this command until it can
437	* be removed. */
438	uint32_t mRefCount;
439	/** The context ID this command belongs to. Will be extracted
440	* always from HGCM parameter [0]. */
441	uint32_t mContextID;
442	/** Dynamic structure for holding the HGCM parms */
443	uint32_t mMsgType;
444	/** Number of HGCM parameters. */
445	uint32_t mParmCount;
446	/** Array of HGCM parameters. */
447	PVBOXHGCMSVCPARM mpParms;
448	/** Incoming timestamp (us). */
449	uint64_t mTimestamp;
450	} HostCommand;
451	typedef std::list< HostCommand *> HostCmdList;
452	typedef std::list< HostCommand *>::iterator HostCmdListIter;
453	typedef std::list< HostCommand *>::const_iterator HostCmdListIterConst;
454
455	/**
456	* Per-client structure used for book keeping/state tracking a
457	* certain host command.
458	*/
459	typedef struct ClientContext
460	{
461	/* Pointer to list node of this command. */
462	HostCommand *mpHostCmd;
463	/** The standard constructor. */
464	ClientContext(void) : mpHostCmd(NULL) {}
465	/** Internal constrcutor. */
466	ClientContext(HostCommand *pHostCmd) : mpHostCmd(pHostCmd) {}
467	} ClientContext;
468	typedef std::map< uint32_t, ClientContext > ClientContextMap;
469	typedef std::map< uint32_t, ClientContext >::iterator ClientContextMapIter;
470	typedef std::map< uint32_t, ClientContext >::const_iterator ClientContextMapIterConst;
471
472	/**
473	* Structure for holding a connected guest client
474	* state.
475	*/
476	typedef struct ClientState
477	{
478	ClientState(void)
479	: mSvcHelpers(NULL),
480	mID(0),
481	mFlags(0),
482	mFilterMask(0), mFilterValue(0),
483	mHostCmdRc(VINF_SUCCESS), mHostCmdTries(0),
484	mHostCmdTS(0),
485	mIsPending(false),
486	mPeekCount(0) { }
487
488	ClientState(PVBOXHGCMSVCHELPERS pSvcHelpers, uint32_t uClientID)
489	: mSvcHelpers(pSvcHelpers),
490	mID(uClientID),
491	mFlags(0),
492	mFilterMask(0), mFilterValue(0),
493	mHostCmdRc(VINF_SUCCESS), mHostCmdTries(0),
494	mHostCmdTS(0),
495	mIsPending(false),
496	mPeekCount(0){ }
497
498	void DequeueAll(void)
499	{
500	HostCmdListIter curItem = mHostCmdList.begin();
501	while (curItem != mHostCmdList.end())
502	curItem = Dequeue(curItem);
503	}
504
505	void DequeueCurrent(void)
506	{
507	HostCmdListIter curCmd = mHostCmdList.begin();
508	if (curCmd != mHostCmdList.end())
509	Dequeue(curCmd);
510	}
511
512	HostCmdListIter Dequeue(HostCmdListIter &curItem)
513	{
514	HostCommand pHostCmd = (curItem);
515	AssertPtr(pHostCmd);
516
517	if (pHostCmd->Release() == 0)
518	{
519	LogFlowThisFunc(("[Client %RU32] Destroying command %RU32\n", mID, pHostCmd->mMsgType));
520
521	delete pHostCmd;
522	pHostCmd = NULL;
523	}
524
525	HostCmdListIter nextItem = mHostCmdList.erase(curItem);
526
527	/* Reset everything else. */
528	mHostCmdRc = VINF_SUCCESS;
529	mHostCmdTries = 0;
530	mPeekCount = 0;
531
532	return nextItem;
533	}
534
535	int EnqueueCommand(HostCommand *pHostCmd)
536	{
537	AssertPtrReturn(pHostCmd, VERR_INVALID_POINTER);
538
539	int rc = VINF_SUCCESS;
540
541	try
542	{
543	mHostCmdList.push_back(pHostCmd);
544	pHostCmd->AddRef();
545	}
546	catch (std::bad_alloc)
547	{
548	rc = VERR_NO_MEMORY;
549	}
550
551	return rc;
552	}
553
554	/** Returns the pointer to the current host command in a client's list.
555	* NULL if no current command available. */
556	const HostCommand *GetCurrent(void)
557	{
558	if (!mHostCmdList.size())
559	return NULL;
560
561	return (*mHostCmdList.begin());
562	}
563
564	bool WantsHostCommand(const HostCommand *pHostCmd) const
565	{
566	AssertPtrReturn(pHostCmd, false);
567
568	#ifdef DEBUG_andy
569	LogFlowFunc(("mHostCmdTS=%RU64, pHostCmdTS=%RU64\n",
570	mHostCmdTS, pHostCmd->mTimestamp));
571	#endif
572
573	/* Only process newer commands. */
574	if (pHostCmd->mTimestamp <= mHostCmdTS)
575	return false;
576
577	/*
578	* If a sesseion filter is set, only obey those commands we're interested in
579	* by applying our context ID filter mask and compare the result with the
580	* original context ID.
581	*/
582	bool fWant;
583	if (mFlags & CLIENTSTATE_FLAG_CONTEXTFILTER)
584	{
585	fWant = (pHostCmd->mContextID & mFilterMask) == mFilterValue;
586	}
587	else /* Client is interested in all commands. */
588	fWant = true;
589
590	LogFlowFunc(("[Client %RU32] mFlags=0x%x, mContextID=%RU32 (session %RU32), mFilterMask=0x%x, mFilterValue=%RU32, fWant=%RTbool\n",
591	mID, mFlags, pHostCmd->mContextID,
592	VBOX_GUESTCTRL_CONTEXTID_GET_SESSION(pHostCmd->mContextID),
593	mFilterMask, mFilterValue, fWant));
594
595	return fWant;
596	}
597
598	/**
599	* Set to indicate that a client call (GUEST_MSG_WAIT) is pending.
600	*/
601	int SetPending(const ClientConnection *pConnection)
602	{
603	AssertPtrReturn(pConnection, VERR_INVALID_POINTER);
604
605	if (mIsPending)
606	{
607	LogFlowFunc(("[Client %RU32] Already is in pending mode\n", mID));
608
609	/*
610	* Signal that we don't and can't return yet.
611	*/
612	return VINF_HGCM_ASYNC_EXECUTE;
613	}
614
615	if (mHostCmdList.empty())
616	{
617	AssertMsg(mIsPending == false,
618	("Client ID=%RU32 already is pending but tried to receive a new host command\n", mID));
619
620	mPendingCon.mHandle = pConnection->mHandle;
621	mPendingCon.mNumParms = pConnection->mNumParms;
622	mPendingCon.mParms = pConnection->mParms;
623
624	mIsPending = true;
625
626	LogFlowFunc(("[Client %RU32] Is now in pending mode\n", mID));
627
628	/*
629	* Signal that we don't and can't return yet.
630	*/
631	return VINF_HGCM_ASYNC_EXECUTE;
632	}
633
634	/*
635	* Signal that there already is a connection pending.
636	* Shouldn't happen in daily usage.
637	*/
638	AssertMsgFailed(("Client already has a connection pending\n"));
639	return VERR_SIGNAL_PENDING;
640	}
641
642	int Run(const ClientConnection *pConnection,
643	HostCommand *pHostCmd)
644	{
645	AssertPtrReturn(pConnection, VERR_INVALID_POINTER);
646	AssertPtrReturn(pHostCmd, VERR_INVALID_POINTER);
647
648	int rc = VINF_SUCCESS;
649
650	LogFlowFunc(("[Client %RU32] pConnection=%p, mHostCmdRc=%Rrc, mHostCmdTries=%RU32, mPeekCount=%RU32\n",
651	mID, pConnection, mHostCmdRc, mHostCmdTries, mPeekCount));
652
653	mHostCmdRc = SendReply(pConnection, pHostCmd);
654
655	LogFlowThisFunc(("[Client %RU32] Processing command %RU32 ended with rc=%Rrc\n", mID, pHostCmd->mMsgType, mHostCmdRc));
656
657	bool fRemove = false;
658	if (RT_FAILURE(mHostCmdRc))
659	{
660	mHostCmdTries++;
661
662	/*
663	* If the client understood the message but supplied too little buffer space
664	* don't send this message again and drop it after 6 unsuccessful attempts.
665	*
666	* Note: Due to legacy reasons this the retry counter has to be even because on
667	* every peek there will be the actual command retrieval from the client side.
668	* To not get the actual command if the client actually only wants to peek for
669	* the next command, there needs to be two rounds per try, e.g. 3 rounds = 6 tries.
670	*
671	** @todo Fix the mess stated above. GUEST_MSG_WAIT should be become GUEST_MSG_PEEK, only
672	* (and every time) returning the next upcoming host command (if any, blocking). Then
673	* it's up to the client what to do next, either peeking again or getting the actual
674	* host command via an own GUEST_ type message.
675	*/
676	if (mHostCmdRc == VERR_TOO_MUCH_DATA)
677	{
678	if (mHostCmdTries == 6)
679	fRemove = true;
680	}
681	/* Client did not understand the message or something else weird happened. Try again one
682	* more time and drop it if it didn't get handled then. */
683	else if (mHostCmdTries > 1)
684	fRemove = true;
685	}
686	else
687	fRemove = true; /* Everything went fine, remove it. */
688
689	LogFlowThisFunc(("[Client %RU32] Tried command %RU32 for %RU32 times, (last result=%Rrc, fRemove=%RTbool)\n",
690	mID, pHostCmd->mMsgType, mHostCmdTries, mHostCmdRc, fRemove));
691
692	if (RT_SUCCESS(rc)) /** @todo r=bird: confusing statement+state, rc hasn't been touched since the top and is always VINF_SUCCESS. */
693	rc = mHostCmdRc;
694
695	if (fRemove)
696	{
697	/** @todo Fix this (slow) lookup. Too late today. */
698	HostCmdListIter curItem = mHostCmdList.begin();
699	while (curItem != mHostCmdList.end())
700	{
701	if ((*curItem) == pHostCmd)
702	{
703	Dequeue(curItem);
704	break;
705	}
706
707	++curItem;
708	}
709	}
710
711	LogFlowFunc(("[Client %RU32] Returned with rc=%Rrc\n", mID, rc));
712	return rc;
713	}
714
715	int RunCurrent(const ClientConnection *pConnection)
716	{
717	AssertPtrReturn(pConnection, VERR_INVALID_POINTER);
718
719	int rc;
720	if (mHostCmdList.empty())
721	{
722	rc = SetPending(pConnection);
723	}
724	else
725	{
726	AssertMsgReturn(!mIsPending,
727	("Client ID=%RU32 still is in pending mode; can't use another connection\n", mID), VERR_INVALID_PARAMETER);
728
729	HostCmdListIter curCmd = mHostCmdList.begin();
730	Assert(curCmd != mHostCmdList.end());
731	HostCommand pHostCmd = (curCmd);
732	AssertPtrReturn(pHostCmd, VERR_INVALID_POINTER);
733
734	rc = Run(pConnection, pHostCmd);
735	}
736
737	return rc;
738	}
739
740	int Wakeup(void)
741	{
742	int rc = VINF_NO_CHANGE;
743
744	if (mIsPending)
745	{
746	LogFlowFunc(("[Client %RU32] Waking up ...\n", mID));
747
748	rc = VINF_SUCCESS;
749
750	HostCmdListIter curCmd = mHostCmdList.begin();
751	if (curCmd != mHostCmdList.end())
752	{
753	HostCommand pHostCmd = (curCmd);
754	AssertPtrReturn(pHostCmd, VERR_INVALID_POINTER);
755
756	LogFlowThisFunc(("[Client %RU32] Current host command is %RU32 (CID=%RU32, cParms=%RU32, refCount=%RU32)\n",
757	mID, pHostCmd->mMsgType, pHostCmd->mContextID, pHostCmd->mParmCount, pHostCmd->mRefCount));
758
759	rc = Run(&mPendingCon, pHostCmd);
760	}
761	else
762	AssertMsgFailed(("Waking up client ID=%RU32 with no host command in queue is a bad idea\n", mID));
763
764	return rc;
765	}
766
767	return VINF_NO_CHANGE;
768	}
769
770	int CancelWaiting(int rcPending)
771	{
772	LogFlowFunc(("[Client %RU32] Cancelling waiting with %Rrc, isPending=%RTbool, pendingNumParms=%RU32, flags=%x\n",
773	mID, rcPending, mIsPending, mPendingCon.mNumParms, mFlags));
774
775	int rc;
776	if ( mIsPending
777	&& mPendingCon.mNumParms >= 2)
778	{
779	mPendingCon.mParms[0].setUInt32(HOST_CANCEL_PENDING_WAITS); /* Message ID. */
780	mPendingCon.mParms[1].setUInt32(0); /* Required parameters for message. */
781
782	AssertPtr(mSvcHelpers);
783	mSvcHelpers->pfnCallComplete(mPendingCon.mHandle, rcPending);
784
785	mIsPending = false;
786
787	rc = VINF_SUCCESS;
788	}
789	else if (mPendingCon.mNumParms < 2)
790	rc = VERR_BUFFER_OVERFLOW;
791	else /** @todo Enqueue command instead of dropping? */
792	rc = VERR_WRONG_ORDER;
793
794	return rc;
795	}
796
797	int SendReply(ClientConnection const *pConnection,
798	HostCommand *pHostCmd)
799	{
800	AssertPtrReturn(pConnection, VERR_INVALID_POINTER);
801	AssertPtrReturn(pHostCmd, VERR_INVALID_POINTER);
802
803	int rc;
804	/* If the client is in pending mode, always send back
805	* the peek result first. */
806	if (mIsPending)
807	{
808	rc = pHostCmd->Peek(pConnection);
809	mPeekCount++;
810	}
811	else
812	{
813	/* If this is the very first peek, make sure to always give back the peeking answer
814	* instead of the actual command, even if this command would fit into the current
815	* connection buffer. */
816	if (!mPeekCount)
817	{
818	rc = pHostCmd->Peek(pConnection);
819	mPeekCount++;
820	}
821	else
822	{
823	/* Try assigning the host command to the client and store the
824	* result code for later use. */
825	rc = pHostCmd->Assign(pConnection);
826	if (RT_FAILURE(rc)) /* If something failed, let the client peek (again). */
827	{
828	rc = pHostCmd->Peek(pConnection);
829	mPeekCount++;
830	}
831	else
832	mPeekCount = 0;
833	}
834	}
835
836	/* Reset pending status. */
837	mIsPending = false;
838
839	/* In any case the client did something, so complete
840	* the pending call with the result we just got. */
841	AssertPtr(mSvcHelpers);
842	mSvcHelpers->pfnCallComplete(pConnection->mHandle, rc);
843
844	LogFlowThisFunc(("[Client %RU32] Command %RU32 ended with %Rrc (mPeekCount=%RU32, pConnection=%p)\n",
845	mID, pHostCmd->mMsgType, rc, mPeekCount, pConnection));
846	return rc;
847	}
848
849	PVBOXHGCMSVCHELPERS mSvcHelpers;
850	/** The client's ID. */
851	uint32_t mID;
852	/** Client flags. @sa CLIENTSTATE_FLAG_ flags. */
853	uint32_t mFlags;
854	/** The context ID filter mask, if any. */
855	uint32_t mFilterMask;
856	/** The context ID filter value, if any. */
857	uint32_t mFilterValue;
858	/** Host command list to process. */
859	HostCmdList mHostCmdList;
860	/** Last (most recent) rc after handling the host command. */
861	int mHostCmdRc;
862	/** How many GUEST_MSG_WAIT calls the client has issued to retrieve one command.
863	*
864	* This is used as a heuristic to remove a message that the client appears not
865	* to be able to successfully retrieve. */
866	uint32_t mHostCmdTries;
867	/** Timestamp (us) of last host command processed. */
868	uint64_t mHostCmdTS;
869	/** Flag indicating whether a client call (GUEST_MSG_WAIT) currently is pending.
870	*
871	* This means the client waits for a new host command to reply and won't return
872	* from the waiting call until a new host command is available.
873	*/
874	bool mIsPending;
875	/** Number of times we've peeked at a pending message.
876	*
877	* This is necessary for being compatible with older Guest Additions. In case
878	* there are commands which only have two (2) parameters and therefore would fit
879	* into the GUEST_MSG_WAIT reply immediately, we now can make sure that the
880	* client first gets back the GUEST_MSG_WAIT results first.
881	*/
882	uint32_t mPeekCount;
883	/** The client's pending connection. */
884	ClientConnection mPendingCon;
885	} ClientState;
886	typedef std::map< uint32_t, ClientState > ClientStateMap;
887	typedef std::map< uint32_t, ClientState >::iterator ClientStateMapIter;
888	typedef std::map< uint32_t, ClientState >::const_iterator ClientStateMapIterConst;
889
890	/**
891	* Class containing the shared information service functionality.
892	*/
893	class Service : public RTCNonCopyable
894	{
895
896	private:
897
898	/** Type definition for use in callback functions. */
899	typedef Service SELF;
900	/** HGCM helper functions. */
901	PVBOXHGCMSVCHELPERS mpHelpers;
902	/**
903	* Callback function supplied by the host for notification of updates
904	* to properties.
905	*/
906	PFNHGCMSVCEXT mpfnHostCallback;
907	/** User data pointer to be supplied to the host callback function. */
908	void *mpvHostData;
909	/** List containing all buffered host commands. */
910	RTLISTANCHOR mHostCmdList;
911	/** Map containing all connected clients. The primary key contains
912	* the HGCM client ID to identify the client. */
913	ClientStateMap mClientStateMap;
914	public:
915	explicit Service(PVBOXHGCMSVCHELPERS pHelpers)
916	: mpHelpers(pHelpers)
917	, mpfnHostCallback(NULL)
918	, mpvHostData(NULL)
919	{
920	RTListInit(&mHostCmdList);
921	}
922
923	/**
924	* @interface_method_impl{VBOXHGCMSVCFNTABLE,pfnUnload}
925	* Simply deletes the service object
926	*/
927	static DECLCALLBACK(int) svcUnload(void *pvService)
928	{
929	AssertLogRelReturn(VALID_PTR(pvService), VERR_INVALID_PARAMETER);
930	SELF pSelf = reinterpret_cast<SELF >(pvService);
931	int rc = pSelf->uninit();
932	AssertRC(rc);
933	if (RT_SUCCESS(rc))
934	delete pSelf;
935	return rc;
936	}
937
938	/**
939	* @interface_method_impl{VBOXHGCMSVCFNTABLE,pfnConnect}
940	* Stub implementation of pfnConnect and pfnDisconnect.
941	*/
942	static DECLCALLBACK(int) svcConnect(void *pvService,
943	uint32_t u32ClientID,
944	void *pvClient)
945	{
946	AssertLogRelReturn(VALID_PTR(pvService), VERR_INVALID_PARAMETER);
947	SELF pSelf = reinterpret_cast<SELF >(pvService);
948	AssertPtrReturn(pSelf, VERR_INVALID_POINTER);
949	return pSelf->clientConnect(u32ClientID, pvClient);
950	}
951
952	/**
953	* @interface_method_impl{VBOXHGCMSVCFNTABLE,pfnConnect}
954	* Stub implementation of pfnConnect and pfnDisconnect.
955	*/
956	static DECLCALLBACK(int) svcDisconnect(void *pvService,
957	uint32_t u32ClientID,
958	void *pvClient)
959	{
960	AssertLogRelReturn(VALID_PTR(pvService), VERR_INVALID_PARAMETER);
961	SELF pSelf = reinterpret_cast<SELF >(pvService);
962	AssertPtrReturn(pSelf, VERR_INVALID_POINTER);
963	return pSelf->clientDisconnect(u32ClientID, pvClient);
964	}
965
966	/**
967	* @interface_method_impl{VBOXHGCMSVCFNTABLE,pfnCall}
968	* Wraps to the call member function
969	*/
970	static DECLCALLBACK(void) svcCall(void * pvService,
971	VBOXHGCMCALLHANDLE callHandle,
972	uint32_t u32ClientID,
973	void *pvClient,
974	uint32_t u32Function,
975	uint32_t cParms,
976	VBOXHGCMSVCPARM paParms[])
977	{
978	AssertLogRelReturnVoid(VALID_PTR(pvService));
979	SELF pSelf = reinterpret_cast<SELF >(pvService);
980	AssertPtrReturnVoid(pSelf);
981	pSelf->call(callHandle, u32ClientID, pvClient, u32Function, cParms, paParms);
982	}
983
984	/**
985	* @interface_method_impl{VBOXHGCMSVCFNTABLE,pfnHostCall}
986	* Wraps to the hostCall member function
987	*/
988	static DECLCALLBACK(int) svcHostCall(void *pvService,
989	uint32_t u32Function,
990	uint32_t cParms,
991	VBOXHGCMSVCPARM paParms[])
992	{
993	AssertLogRelReturn(VALID_PTR(pvService), VERR_INVALID_PARAMETER);
994	SELF pSelf = reinterpret_cast<SELF >(pvService);
995	AssertPtrReturn(pSelf, VERR_INVALID_POINTER);
996	return pSelf->hostCall(u32Function, cParms, paParms);
997	}
998
999	/**
1000	* @interface_method_impl{VBOXHGCMSVCFNTABLE,pfnRegisterExtension}
1001	* Installs a host callback for notifications of property changes.
1002	*/
1003	static DECLCALLBACK(int) svcRegisterExtension(void *pvService,
1004	PFNHGCMSVCEXT pfnExtension,
1005	void *pvExtension)
1006	{
1007	AssertLogRelReturn(VALID_PTR(pvService), VERR_INVALID_PARAMETER);
1008	SELF pSelf = reinterpret_cast<SELF >(pvService);
1009	AssertPtrReturn(pSelf, VERR_INVALID_POINTER);
1010	pSelf->mpfnHostCallback = pfnExtension;
1011	pSelf->mpvHostData = pvExtension;
1012	return VINF_SUCCESS;
1013	}
1014
1015	private:
1016
1017	int prepareExecute(uint32_t cParms, VBOXHGCMSVCPARM paParms[]);
1018	int clientConnect(uint32_t u32ClientID, void *pvClient);
1019	int clientDisconnect(uint32_t u32ClientID, void *pvClient);
1020	int clientMsgGet(uint32_t u32ClientID, VBOXHGCMCALLHANDLE callHandle, uint32_t cParms, VBOXHGCMSVCPARM paParms[]);
1021	int clientMsgFilterSet(uint32_t u32ClientID, VBOXHGCMCALLHANDLE callHandle, uint32_t cParms, VBOXHGCMSVCPARM paParms[]);
1022	int clientMsgFilterUnset(uint32_t u32ClientID, VBOXHGCMCALLHANDLE callHandle, uint32_t cParms, VBOXHGCMSVCPARM paParms[]);
1023	int clientMsgSkip(uint32_t u32ClientID, VBOXHGCMCALLHANDLE callHandle, uint32_t cParms, VBOXHGCMSVCPARM paParms[]);
1024	int hostCallback(uint32_t eFunction, uint32_t cParms, VBOXHGCMSVCPARM paParms[]);
1025	int hostProcessCommand(uint32_t eFunction, uint32_t cParms, VBOXHGCMSVCPARM paParms[]);
1026	void call(VBOXHGCMCALLHANDLE callHandle, uint32_t u32ClientID, void *pvClient, uint32_t eFunction, uint32_t cParms, VBOXHGCMSVCPARM paParms[]);
1027	int hostCall(uint32_t eFunction, uint32_t cParms, VBOXHGCMSVCPARM paParms[]);
1028	int sessionClose(uint32_t u32ClientID, VBOXHGCMCALLHANDLE callHandle, uint32_t cParms, VBOXHGCMSVCPARM paParms[]);
1029	int uninit(void);
1030
1031	DECLARE_CLS_COPY_CTOR_ASSIGN_NOOP(Service);
1032	};
1033
1034	/**
1035	* Handles a client which just connected.
1036	*
1037	* @return IPRT status code.
1038	* @param u32ClientID
1039	* @param pvClient
1040	*/
1041	int Service::clientConnect(uint32_t u32ClientID, void *pvClient)
1042	{
1043	RT_NOREF(pvClient);
1044	LogFlowFunc(("[Client %RU32] Connected\n", u32ClientID));
1045	#ifdef VBOX_STRICT
1046	ClientStateMapIterConst it = mClientStateMap.find(u32ClientID);
1047	if (it != mClientStateMap.end())
1048	{
1049	AssertMsgFailed(("Client with ID=%RU32 already connected when it should not\n",
1050	u32ClientID));
1051	return VERR_ALREADY_EXISTS;
1052	}
1053	#endif
1054	ClientState clientState(mpHelpers, u32ClientID);
1055	mClientStateMap[u32ClientID] = clientState;
1056	/** @todo Exception handling! */
1057	return VINF_SUCCESS;
1058	}
1059
1060	/**
1061	* Handles a client which disconnected. This functiond does some
1062	* internal cleanup as well as sends notifications to the host so
1063	* that the host can do the same (if required).
1064	*
1065	* @return IPRT status code.
1066	* @param u32ClientID The client's ID of which disconnected.
1067	* @param pvClient User data, not used at the moment.
1068	*/
1069	int Service::clientDisconnect(uint32_t u32ClientID, void *pvClient)
1070	{
1071	RT_NOREF(pvClient);
1072	LogFlowFunc(("[Client %RU32] Disconnected (%zu clients total)\n",
1073	u32ClientID, mClientStateMap.size()));
1074
1075	AssertMsg(mClientStateMap.size(),
1076	("No clients in list anymore when there should (client ID=%RU32)\n", u32ClientID));
1077
1078	int rc = VINF_SUCCESS;
1079
1080	ClientStateMapIter itClientState = mClientStateMap.find(u32ClientID);
1081	AssertMsg(itClientState != mClientStateMap.end(),
1082	("Client ID=%RU32 not found in client list when it should be there\n", u32ClientID));
1083
1084	if (itClientState != mClientStateMap.end())
1085	{
1086	itClientState->second.DequeueAll();
1087
1088	mClientStateMap.erase(itClientState);
1089	}
1090
1091	bool fAllClientsDisconnected = mClientStateMap.empty();
1092	if (fAllClientsDisconnected)
1093	{
1094	LogFlowFunc(("All clients disconnected, cancelling all host commands ...\n"));
1095
1096	/*
1097	* If all clients disconnected we also need to make sure that all buffered
1098	* host commands need to be notified, because Main is waiting a notification
1099	* via a (multi stage) progress object.
1100	*/
1101	HostCommand *pCurCmd = RTListGetFirst(&mHostCmdList, HostCommand, Node);
1102	while (pCurCmd)
1103	{
1104	HostCommand *pNext = RTListNodeGetNext(&pCurCmd->Node, HostCommand, Node);
1105	bool fLast = RTListNodeIsLast(&mHostCmdList, &pCurCmd->Node);
1106
1107	uint32_t cParms = 0;
1108	VBOXHGCMSVCPARM arParms[2];
1109	arParms[cParms++].setUInt32(pCurCmd->mContextID);
1110
1111	int rc2 = hostCallback(GUEST_DISCONNECTED, cParms, arParms);
1112	if (RT_FAILURE(rc2))
1113	{
1114	LogFlowFunc(("Cancelling host command with CID=%u (refCount=%RU32) failed with rc=%Rrc\n",
1115	pCurCmd->mContextID, pCurCmd->mRefCount, rc2));
1116	/* Keep going. */
1117	}
1118
1119	while (pCurCmd->Release())
1120	;
1121	delete pCurCmd;
1122	pCurCmd = NULL;
1123
1124	if (fLast)
1125	break;
1126
1127	pCurCmd = pNext;
1128	}
1129
1130	Assert(RTListIsEmpty(&mHostCmdList));
1131	}
1132
1133	return rc;
1134	}
1135
1136	/**
1137	* A client asks for the next message to process.
1138	*
1139	* This either fills in a pending host command into the client's parameter space
1140	* or defers the guest call until we have something from the host.
1141	*
1142	* @return IPRT status code.
1143	* @param u32ClientID The client's ID.
1144	* @param callHandle The client's call handle.
1145	* @param cParms Number of parameters.
1146	* @param paParms Array of parameters.
1147	*/
1148	int Service::clientMsgGet(uint32_t u32ClientID, VBOXHGCMCALLHANDLE callHandle,
1149	uint32_t cParms, VBOXHGCMSVCPARM paParms[])
1150	{
1151	/*
1152	* Lookup client in our list so that we can assign the context ID of
1153	* a command to that client.
1154	*/
1155	ClientStateMapIter itClientState = mClientStateMap.find(u32ClientID);
1156	AssertMsg(itClientState != mClientStateMap.end(), ("Client with ID=%RU32 not found when it should be present\n",
1157	u32ClientID));
1158	if (itClientState == mClientStateMap.end())
1159	{
1160	/* Should never happen. Complete the call on the guest side though. */
1161	AssertPtr(mpHelpers);
1162	mpHelpers->pfnCallComplete(callHandle, VERR_NOT_FOUND);
1163
1164	return VERR_NOT_FOUND;
1165	}
1166
1167	ClientState &clientState = itClientState->second;
1168
1169	/* Use the current (inbound) connection. */
1170	ClientConnection thisCon;
1171	thisCon.mHandle = callHandle;
1172	thisCon.mNumParms = cParms;
1173	thisCon.mParms = paParms;
1174
1175	return clientState.RunCurrent(&thisCon);
1176	}
1177
1178	/**
1179	* A client tells this service to set a message filter.
1180	* That way a client only will get new messages which matches the filter.
1181	*
1182	* @return VBox status code.
1183	* @param u32ClientID The client's ID.
1184	* @param callHandle The client's call handle.
1185	* @param cParms Number of parameters.
1186	* @param paParms Array of parameters.
1187	*/
1188	int Service::clientMsgFilterSet(uint32_t u32ClientID, VBOXHGCMCALLHANDLE callHandle,
1189	uint32_t cParms, VBOXHGCMSVCPARM paParms[])
1190	{
1191	RT_NOREF(callHandle);
1192
1193	/*
1194	* Lookup client in our list so that we can assign the context ID of
1195	* a command to that client.
1196	*/
1197	ClientStateMapIter itClientState = mClientStateMap.find(u32ClientID);
1198	AssertMsg(itClientState != mClientStateMap.end(), ("Client with ID=%RU32 not found when it should be present\n",
1199	u32ClientID));
1200	if (itClientState == mClientStateMap.end())
1201	return VERR_NOT_FOUND; /* Should never happen. */
1202
1203	if (cParms != 4)
1204	return VERR_INVALID_PARAMETER;
1205
1206	uint32_t uValue;
1207	int rc = paParms[0].getUInt32(&uValue);
1208	if (RT_SUCCESS(rc))
1209	{
1210	uint32_t uMaskAdd;
1211	rc = paParms[1].getUInt32(&uMaskAdd);
1212	if (RT_SUCCESS(rc))
1213	{
1214	uint32_t uMaskRemove;
1215	rc = paParms[2].getUInt32(&uMaskRemove);
1216	/** @todo paParm[3] (flags) not used yet. */
1217	if (RT_SUCCESS(rc))
1218	{
1219	ClientState &clientState = itClientState->second;
1220
1221	clientState.mFlags \|= CLIENTSTATE_FLAG_CONTEXTFILTER;
1222	if (uMaskAdd)
1223	clientState.mFilterMask \|= uMaskAdd;
1224	if (uMaskRemove)
1225	clientState.mFilterMask &= ~uMaskRemove;
1226
1227	clientState.mFilterValue = uValue;
1228
1229	LogFlowFunc(("[Client %RU32] Setting message filterMask=0x%x, filterVal=%RU32 set (flags=0x%x, maskAdd=0x%x, maskRemove=0x%x)\n",
1230	u32ClientID, clientState.mFilterMask, clientState.mFilterValue,
1231	clientState.mFlags, uMaskAdd, uMaskRemove));
1232	}
1233	}
1234	}
1235
1236	return rc;
1237	}
1238
1239	/**
1240	* A client tells this service to unset (clear) its message filter.
1241	*
1242	* @return VBox status code.
1243	* @param u32ClientID The client's ID.
1244	* @param callHandle The client's call handle.
1245	* @param cParms Number of parameters.
1246	* @param paParms Array of parameters.
1247	*/
1248	int Service::clientMsgFilterUnset(uint32_t u32ClientID, VBOXHGCMCALLHANDLE callHandle,
1249	uint32_t cParms, VBOXHGCMSVCPARM paParms[])
1250	{
1251	RT_NOREF(callHandle, paParms);
1252
1253	/*
1254	* Lookup client in our list so that we can assign the context ID of
1255	* a command to that client.
1256	*/
1257	ClientStateMapIter itClientState = mClientStateMap.find(u32ClientID);
1258	AssertMsg(itClientState != mClientStateMap.end(), ("Client with ID=%RU32 not found when it should be present\n",
1259	u32ClientID));
1260	if (itClientState == mClientStateMap.end())
1261	return VERR_NOT_FOUND; /* Should never happen. */
1262
1263	if (cParms != 1)
1264	return VERR_INVALID_PARAMETER;
1265
1266	ClientState &clientState = itClientState->second;
1267
1268	clientState.mFlags &= ~CLIENTSTATE_FLAG_CONTEXTFILTER;
1269	clientState.mFilterMask = 0;
1270	clientState.mFilterValue = 0;
1271
1272	LogFlowFunc(("[Client %RU32} Unset message filter\n", u32ClientID));
1273	return VINF_SUCCESS;
1274	}
1275
1276	/**
1277	* A client tells this service that the current command can be skipped and therefore can be removed
1278	* from the internal command list.
1279	*
1280	* @return VBox status code.
1281	* @param u32ClientID The client's ID.
1282	* @param callHandle The client's call handle.
1283	* @param cParms Number of parameters.
1284	* @param paParms Array of parameters.
1285	*/
1286	int Service::clientMsgSkip(uint32_t u32ClientID, VBOXHGCMCALLHANDLE callHandle,
1287	uint32_t cParms, VBOXHGCMSVCPARM paParms[])
1288	{
1289	RT_NOREF(callHandle, cParms, paParms);
1290
1291	int rc;
1292
1293	/*
1294	* Lookup client in our list so that we can assign the context ID of
1295	* a command to that client.
1296	*/
1297	ClientStateMapIter itClientState = mClientStateMap.find(u32ClientID);
1298	AssertMsg(itClientState != mClientStateMap.end(), ("Client ID=%RU32 not found when it should be present\n", u32ClientID));
1299	if (itClientState != mClientStateMap.end())
1300	{
1301	itClientState->second.DequeueCurrent();
1302	rc = VINF_SUCCESS;
1303	}
1304	else
1305	rc = VERR_NOT_FOUND;
1306
1307	LogFlowFunc(("[Client %RU32] Skipped current message, rc=%Rrc\n", u32ClientID, rc));
1308	return rc;
1309	}
1310
1311	/**
1312	* Notifies the host (using low-level HGCM callbacks) about an event
1313	* which was sent from the client.
1314	*
1315	* @return IPRT status code.
1316	* @param eFunction Function (event) that occured.
1317	* @param cParms Number of parameters.
1318	* @param paParms Array of parameters.
1319	*/
1320	int Service::hostCallback(uint32_t eFunction, uint32_t cParms, VBOXHGCMSVCPARM paParms[])
1321	{
1322	LogFlowFunc(("eFunction=%ld, cParms=%ld, paParms=%p\n",
1323	eFunction, cParms, paParms));
1324
1325	int rc;
1326	if (mpfnHostCallback)
1327	{
1328	VBOXGUESTCTRLHOSTCALLBACK data(cParms, paParms);
1329	rc = mpfnHostCallback(mpvHostData, eFunction, (void *)(&data), sizeof(data));
1330	}
1331	else
1332	rc = VERR_NOT_SUPPORTED;
1333
1334	LogFlowFunc(("Returning rc=%Rrc\n", rc));
1335	return rc;
1336	}
1337
1338	/**
1339	* Processes a command received from the host side and re-routes it to
1340	* a connect client on the guest.
1341	*
1342	* @return IPRT status code.
1343	* @param eFunction Function code to process.
1344	* @param cParms Number of parameters.
1345	* @param paParms Array of parameters.
1346	*/
1347	int Service::hostProcessCommand(uint32_t eFunction, uint32_t cParms, VBOXHGCMSVCPARM paParms[])
1348	{
1349	/*
1350	* If no client is connected at all we don't buffer any host commands
1351	* and immediately return an error to the host. This avoids the host
1352	* waiting for a response from the guest side in case VBoxService on
1353	* the guest is not running/system is messed up somehow.
1354	*/
1355	if (mClientStateMap.empty())
1356	return VERR_NOT_FOUND;
1357
1358	int rc;
1359
1360	HostCommand *pHostCmd = NULL;
1361	try
1362	{
1363	pHostCmd = new HostCommand();
1364	rc = pHostCmd->Allocate(eFunction, cParms, paParms);
1365	if (RT_SUCCESS(rc))
1366	/* rc = */ RTListAppend(&mHostCmdList, &pHostCmd->Node);
1367	}
1368	catch (std::bad_alloc)
1369	{
1370	rc = VERR_NO_MEMORY;
1371	}
1372
1373	if (RT_SUCCESS(rc))
1374	{
1375	LogFlowFunc(("Handling host command CID=%RU32, eFunction=%RU32, cParms=%RU32, paParms=%p, numClients=%zu\n",
1376	pHostCmd->mContextID, eFunction, cParms, paParms, mClientStateMap.size()));
1377
1378	/*
1379	* Wake up all pending clients which are interested in this
1380	* host command.
1381	*/
1382	#ifdef DEBUG
1383	uint32_t uClientsWokenUp = 0;
1384	#endif
1385	ClientStateMapIter itClientState = mClientStateMap.begin();
1386	AssertMsg(itClientState != mClientStateMap.end(), ("Client state map is empty when it should not\n"));
1387	while (itClientState != mClientStateMap.end())
1388	{
1389	ClientState &clientState = itClientState->second;
1390
1391	/* If a client indicates that it it wants the new host command,
1392	* add a reference to not delete it.*/
1393	if (clientState.WantsHostCommand(pHostCmd))
1394	{
1395	clientState.EnqueueCommand(pHostCmd);
1396
1397	int rc2 = clientState.Wakeup();
1398	if (RT_FAILURE(rc2))
1399	LogFlowFunc(("Waking up client ID=%RU32 failed with rc=%Rrc\n",
1400	itClientState->first, rc2));
1401	#ifdef DEBUG
1402	uClientsWokenUp++;
1403	#endif
1404	}
1405
1406	++itClientState;
1407	}
1408
1409	#ifdef DEBUG
1410	LogFlowFunc(("%RU32 clients have been woken up\n", uClientsWokenUp));
1411	#endif
1412	}
1413
1414	return rc;
1415	}
1416
1417	/**
1418	* @interface_method_impl{VBOXHGCMSVCFNTABLE,pfnCall}
1419	*
1420	* @note All functions which do not involve an unreasonable delay will be
1421	* handled synchronously. If needed, we will add a request handler
1422	* thread in future for those which do.
1423	*
1424	* @thread HGCM
1425	*/
1426	void Service::call(VBOXHGCMCALLHANDLE callHandle, uint32_t u32ClientID,
1427	void * /* pvClient */, uint32_t eFunction, uint32_t cParms,
1428	VBOXHGCMSVCPARM paParms[])
1429	{
1430	int rc = VINF_SUCCESS;
1431	LogFlowFunc(("[Client %RU32] eFunction=%RU32, cParms=%RU32, paParms=0x%p\n",
1432	u32ClientID, eFunction, cParms, paParms));
1433	try
1434	{
1435	/*
1436	* The guest asks the host for the next message to process.
1437	*/
1438	if (eFunction == GUEST_MSG_WAIT)
1439	{
1440	LogFlowFunc(("[Client %RU32] GUEST_MSG_GET\n", u32ClientID));
1441	rc = clientMsgGet(u32ClientID, callHandle, cParms, paParms);
1442	}
1443	else
1444	{
1445	switch (eFunction)
1446	{
1447	/*
1448	* A client wants to shut down and asks us (this service) to cancel
1449	* all blocking/pending waits (VINF_HGCM_ASYNC_EXECUTE) so that the
1450	* client can gracefully shut down.
1451	*/
1452	case GUEST_CANCEL_PENDING_WAITS:
1453	{
1454	LogFlowFunc(("[Client %RU32] GUEST_CANCEL_PENDING_WAITS\n", u32ClientID));
1455	ClientStateMapIter itClientState = mClientStateMap.find(u32ClientID);
1456	if (itClientState != mClientStateMap.end())
1457	rc = itClientState->second.CancelWaiting(VINF_SUCCESS /* Pending result */);
1458	break;
1459	}
1460
1461	/*
1462	* The guest only wants certain messages set by the filter mask(s).
1463	* Since VBox 4.3+.
1464	*/
1465	case GUEST_MSG_FILTER_SET:
1466	LogFlowFunc(("[Client %RU32] GUEST_MSG_FILTER_SET\n", u32ClientID));
1467	rc = clientMsgFilterSet(u32ClientID, callHandle, cParms, paParms);
1468	break;
1469
1470	/*
1471	* Unsetting the message filter flag.
1472	*/
1473	case GUEST_MSG_FILTER_UNSET:
1474	LogFlowFunc(("[Client %RU32] GUEST_MSG_FILTER_UNSET\n", u32ClientID));
1475	rc = clientMsgFilterUnset(u32ClientID, callHandle, cParms, paParms);
1476	break;
1477
1478	/*
1479	* The guest only wants skip the currently assigned messages. Neded
1480	* for dropping its assigned reference of the current assigned host
1481	* command in queue.
1482	* Since VBox 4.3+.
1483	*/
1484	case GUEST_MSG_SKIP:
1485	LogFlowFunc(("[Client %RU32] GUEST_MSG_SKIP\n", u32ClientID));
1486	rc = clientMsgSkip(u32ClientID, callHandle, cParms, paParms);
1487	break;
1488
1489	/*
1490	* The guest wants to close specific guest session. This is handy for
1491	* shutting down dedicated guest session processes from another process.
1492	*/
1493	case GUEST_SESSION_CLOSE:
1494	LogFlowFunc(("[Client %RU32] GUEST_SESSION_CLOSE\n", u32ClientID));
1495	rc = sessionClose(u32ClientID, callHandle, cParms, paParms);
1496	break;
1497
1498	/*
1499	* For all other regular commands we call our hostCallback
1500	* function. If the current command does not support notifications,
1501	* notifyHost will return VERR_NOT_SUPPORTED.
1502	*/
1503	default:
1504	rc = hostCallback(eFunction, cParms, paParms);
1505	break;
1506	}
1507
1508	if (rc != VINF_HGCM_ASYNC_EXECUTE)
1509	{
1510	/* Tell the client that the call is complete (unblocks waiting). */
1511	AssertPtr(mpHelpers);
1512	mpHelpers->pfnCallComplete(callHandle, rc);
1513	}
1514	}
1515	}
1516	catch (std::bad_alloc)
1517	{
1518	rc = VERR_NO_MEMORY;
1519	}
1520	}
1521
1522	/**
1523	* Service call handler for the host.
1524	* @interface_method_impl{VBOXHGCMSVCFNTABLE,pfnHostCall}
1525	* @thread hgcm
1526	*/
1527	int Service::hostCall(uint32_t eFunction, uint32_t cParms, VBOXHGCMSVCPARM paParms[])
1528	{
1529	int rc = VERR_NOT_SUPPORTED;
1530	LogFlowFunc(("fn=%RU32, cParms=%RU32, paParms=0x%p\n",
1531	eFunction, cParms, paParms));
1532	try
1533	{
1534	switch (eFunction)
1535	{
1536	/**
1537	* Host
1538	*/
1539	case HOST_CANCEL_PENDING_WAITS:
1540	{
1541	LogFlowFunc(("HOST_CANCEL_PENDING_WAITS\n"));
1542	ClientStateMapIter itClientState = mClientStateMap.begin();
1543	while (itClientState != mClientStateMap.end())
1544	{
1545	int rc2 = itClientState->second.CancelWaiting(VINF_SUCCESS /* Pending rc. */);
1546	if (RT_FAILURE(rc2))
1547	LogFlowFunc(("Cancelling waiting for client ID=%RU32 failed with rc=%Rrc",
1548	itClientState->first, rc2));
1549	++itClientState;
1550	}
1551	rc = VINF_SUCCESS;
1552	break;
1553	}
1554
1555	default:
1556	rc = hostProcessCommand(eFunction, cParms, paParms);
1557	break;
1558	}
1559	}
1560	catch (std::bad_alloc)
1561	{
1562	rc = VERR_NO_MEMORY;
1563	}
1564
1565	return rc;
1566	}
1567
1568	/**
1569	* Client asks another client (guest) session to close.
1570	*
1571	* @return IPRT status code.
1572	* @param u32ClientID The client's ID.
1573	* @param callHandle The client's call handle.
1574	* @param cParms Number of parameters.
1575	* @param paParms Array of parameters.
1576	*/
1577	int Service::sessionClose(uint32_t u32ClientID, VBOXHGCMCALLHANDLE callHandle, uint32_t cParms, VBOXHGCMSVCPARM paParms[])
1578	{
1579	RT_NOREF(u32ClientID, callHandle);
1580	if (cParms < 2)
1581	return VERR_INVALID_PARAMETER;
1582
1583	uint32_t uContextID, uFlags;
1584	int rc = paParms[0].getUInt32(&uContextID);
1585	if (RT_SUCCESS(rc))
1586	rc = paParms[1].getUInt32(&uFlags);
1587
1588	uint32_t uSessionID = VBOX_GUESTCTRL_CONTEXTID_GET_SESSION(uContextID);
1589
1590	if (RT_SUCCESS(rc))
1591	rc = hostProcessCommand(HOST_SESSION_CLOSE, cParms, paParms);
1592
1593	LogFlowFunc(("Closing guest session ID=%RU32 (from client ID=%RU32) returned with rc=%Rrc\n",
1594	uSessionID, u32ClientID, rc)); NOREF(uSessionID);
1595	return rc;
1596	}
1597
1598	int Service::uninit(void)
1599	{
1600	return VINF_SUCCESS;
1601	}
1602
1603	} /* namespace guestControl */
1604
1605	using guestControl::Service;
1606
1607	/**
1608	* @copydoc VBOXHGCMSVCLOAD
1609	*/
1610	extern "C" DECLCALLBACK(DECLEXPORT(int)) VBoxHGCMSvcLoad(VBOXHGCMSVCFNTABLE *pTable)
1611	{
1612	int rc = VINF_SUCCESS;
1613
1614	LogFlowFunc(("pTable=%p\n", pTable));
1615
1616	if (!VALID_PTR(pTable))
1617	{
1618	rc = VERR_INVALID_PARAMETER;
1619	}
1620	else
1621	{
1622	LogFlowFunc(("pTable->cbSize=%d, pTable->u32Version=0x%08X\n", pTable->cbSize, pTable->u32Version));
1623
1624	if ( pTable->cbSize != sizeof (VBOXHGCMSVCFNTABLE)
1625	\|\| pTable->u32Version != VBOX_HGCM_SVC_VERSION)
1626	{
1627	rc = VERR_VERSION_MISMATCH;
1628	}
1629	else
1630	{
1631	Service *pService = NULL;
1632	/* No exceptions may propagate outside. */
1633	try
1634	{
1635	pService = new Service(pTable->pHelpers);
1636	}
1637	catch (int rcThrown)
1638	{
1639	rc = rcThrown;
1640	}
1641	catch(std::bad_alloc &)
1642	{
1643	rc = VERR_NO_MEMORY;
1644	}
1645
1646	if (RT_SUCCESS(rc))
1647	{
1648	/*
1649	* We don't need an additional client data area on the host,
1650	* because we're a class which can have members for that :-).
1651	*/
1652	pTable->cbClient = 0;
1653
1654	/* Register functions. */
1655	pTable->pfnUnload = Service::svcUnload;
1656	pTable->pfnConnect = Service::svcConnect;
1657	pTable->pfnDisconnect = Service::svcDisconnect;
1658	pTable->pfnCall = Service::svcCall;
1659	pTable->pfnHostCall = Service::svcHostCall;
1660	pTable->pfnSaveState = NULL; /* The service is stateless, so the normal */
1661	pTable->pfnLoadState = NULL; /* construction done before restoring suffices */
1662	pTable->pfnRegisterExtension = Service::svcRegisterExtension;
1663
1664	/* Service specific initialization. */
1665	pTable->pvService = pService;
1666	}
1667	else
1668	{
1669	if (pService)
1670	{
1671	delete pService;
1672	pService = NULL;
1673	}
1674	}
1675	}
1676	}
1677
1678	LogFlowFunc(("Returning %Rrc\n", rc));
1679	return rc;
1680	}
1681

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source: vbox/trunk/src/VBox/HostServices/GuestControl/service.cpp@ 72075

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