service.cpp@ 53399

Last change on this file since 53399 was 50825, checked in by vboxsync, 11 years ago
GuestCtrl/HostService: Complete call if a client was not found anymore.
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File size: 57.4 KB

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1	/* $Id: service.cpp 50825 2014-03-19 16:18:24Z vboxsync $ */
2	/** @file
3	* Guest Control Service: Controlling the guest.
4	*/
5
6	/*
7	* Copyright (C) 2011-2014 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	* Header Files *
60	*******************************************************************************/
61	#ifdef LOG_GROUP
62	#undef LOG_GROUP
63	#endif
64	#define LOG_GROUP LOG_GROUP_GUEST_CONTROL
65	#include <VBox/HostServices/GuestControlSvc.h>
66
67	#include <VBox/log.h>
68	#include <iprt/assert.h>
69	#include <iprt/cpp/autores.h>
70	#include <iprt/cpp/utils.h>
71	#include <iprt/err.h>
72	#include <iprt/mem.h>
73	#include <iprt/list.h>
74	#include <iprt/req.h>
75	#include <iprt/string.h>
76	#include <iprt/thread.h>
77	#include <iprt/time.h>
78
79	#include <map>
80	#include <memory> /* for auto_ptr */
81	#include <string>
82	#include <list>
83
84	#include "gctrl.h"
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	LogFlowFunc(("Adding reference pHostCmd=%p, CID=%RU32, new refCount=%RU32\n",
121	this, mContextID, mRefCount + 1));
122	#endif
123	return ++mRefCount;
124	}
125
126	uint32_t Release(void)
127	{
128	#ifdef DEBUG_andy
129	LogFlowFunc(("Releasing reference pHostCmd=%p, CID=%RU32, new refCount=%RU32\n",
130	this, mContextID, mRefCount - 1));
131	#endif
132	/* Release reference for current command. */
133	Assert(mRefCount);
134	if (--mRefCount == 0)
135	Free();
136
137	return mRefCount;
138	}
139
140	/**
141	* Allocates the command with an HGCM request. Needs to be free'd using Free().
142	*
143	* @return IPRT status code.
144	* @param uMsg Message type.
145	* @param cParms Number of parameters of HGCM request.
146	* @param paParms Array of parameters of HGCM request.
147	*/
148	int Allocate(uint32_t uMsg, uint32_t cParms, VBOXHGCMSVCPARM paParms[])
149	{
150	LogFlowFunc(("Allocating pHostCmd=%p, uMsg=%RU32, cParms=%RU32, paParms=%p\n",
151	this, uMsg, cParms, paParms));
152
153	if (!cParms) /* At least one parameter (context ID) must be present. */
154	return VERR_INVALID_PARAMETER;
155
156	AssertPtrReturn(paParms, VERR_INVALID_POINTER);
157
158	/* Paranoia. */
159	if (cParms > 256)
160	cParms = 256;
161
162	int rc = VINF_SUCCESS;
163
164	/*
165	* Don't verify anything here (yet), because this function only buffers
166	* the HGCM data into an internal structure and reaches it back to the guest (client)
167	* in an unmodified state.
168	*/
169	mMsgType = uMsg;
170	mParmCount = cParms;
171	if (mParmCount)
172	{
173	mpParms = (VBOXHGCMSVCPARM)RTMemAllocZ(sizeof(VBOXHGCMSVCPARM) mParmCount);
174	if (NULL == mpParms)
175	rc = VERR_NO_MEMORY;
176	}
177
178	if (RT_SUCCESS(rc))
179	{
180	for (uint32_t i = 0; i < mParmCount; i++)
181	{
182	mpParms[i].type = paParms[i].type;
183	switch (paParms[i].type)
184	{
185	case VBOX_HGCM_SVC_PARM_32BIT:
186	mpParms[i].u.uint32 = paParms[i].u.uint32;
187	break;
188
189	case VBOX_HGCM_SVC_PARM_64BIT:
190	mpParms[i].u.uint64 = paParms[i].u.uint64;
191	break;
192
193	case VBOX_HGCM_SVC_PARM_PTR:
194	mpParms[i].u.pointer.size = paParms[i].u.pointer.size;
195	if (mpParms[i].u.pointer.size > 0)
196	{
197	mpParms[i].u.pointer.addr = RTMemAlloc(mpParms[i].u.pointer.size);
198	if (NULL == mpParms[i].u.pointer.addr)
199	{
200	rc = VERR_NO_MEMORY;
201	break;
202	}
203	else
204	memcpy(mpParms[i].u.pointer.addr,
205	paParms[i].u.pointer.addr,
206	mpParms[i].u.pointer.size);
207	}
208	else
209	{
210	/* Size is 0 -- make sure we don't have any pointer. */
211	mpParms[i].u.pointer.addr = NULL;
212	}
213	break;
214
215	default:
216	break;
217	}
218	if (RT_FAILURE(rc))
219	break;
220	}
221	}
222
223	if (RT_SUCCESS(rc))
224	{
225	/*
226	* Assume that the context ID always is the first parameter,
227	* assign the context ID to the command.
228	*/
229	rc = mpParms[0].getUInt32(&mContextID);
230
231	/* Set timestamp so that clients can distinguish between already
232	* processed commands and new ones. */
233	mTimestamp = RTTimeNanoTS();
234	}
235
236	LogFlowFunc(("Returned with rc=%Rrc\n", rc));
237	return rc;
238	}
239
240	/**
241	* Frees the buffered HGCM request.
242	*
243	* @return IPRT status code.
244	*/
245	void Free(void)
246	{
247	AssertMsg(mRefCount == 0, ("pHostCmd=%p, CID=%RU32 still being used by a client (%RU32 refs), cannot free yet\n",
248	this, mContextID, mRefCount));
249
250	LogFlowFunc(("Freeing host command pHostCmd=%p, CID=%RU32, mMsgType=%RU32, mParmCount=%RU32, mpParms=%p\n",
251	this, mContextID, mMsgType, mParmCount, mpParms));
252
253	for (uint32_t i = 0; i < mParmCount; i++)
254	{
255	switch (mpParms[i].type)
256	{
257	case VBOX_HGCM_SVC_PARM_PTR:
258	if (mpParms[i].u.pointer.size > 0)
259	RTMemFree(mpParms[i].u.pointer.addr);
260	break;
261
262	default:
263	break;
264	}
265	}
266
267	if (mpParms)
268	{
269	RTMemFree(mpParms);
270	mpParms = NULL;
271	}
272
273	mParmCount = 0;
274
275	/* Removes the command from its list */
276	RTListNodeRemove(&Node);
277	}
278
279	/**
280	* Copies data from the buffered HGCM request to the current HGCM request.
281	*
282	* @return IPRT status code.
283	* @param paDstParms Array of parameters of HGCM request to fill the data into.
284	* @param cPDstarms Number of parameters the HGCM request can handle.
285	* @param pSrcBuf Parameter buffer to assign.
286	*/
287	int CopyTo(VBOXHGCMSVCPARM paDstParms[], uint32_t cDstParms) const
288	{
289	LogFlowFunc(("pHostCmd=%p, mMsgType=%RU32, mParmCount=%RU32, mContextID=%RU32 (Session %RU32)\n",
290	this, mMsgType, mParmCount, mContextID, VBOX_GUESTCTRL_CONTEXTID_GET_SESSION(mContextID)));
291
292	int rc = VINF_SUCCESS;
293	if (cDstParms != mParmCount)
294	{
295	LogFlowFunc(("Parameter count does not match (got %RU32, expected %RU32)\n",
296	cDstParms, mParmCount));
297	rc = VERR_INVALID_PARAMETER;
298	}
299
300	if (RT_SUCCESS(rc))
301	{
302	for (uint32_t i = 0; i < mParmCount; i++)
303	{
304	if (paDstParms[i].type != mpParms[i].type)
305	{
306	LogFlowFunc(("Parameter %RU32 type mismatch (got %RU32, expected %RU32)\n",
307	i, paDstParms[i].type, mpParms[i].type));
308	rc = VERR_INVALID_PARAMETER;
309	}
310	else
311	{
312	switch (mpParms[i].type)
313	{
314	case VBOX_HGCM_SVC_PARM_32BIT:
315	#ifdef DEBUG_andy
316	LogFlowFunc(("\tmpParms[%RU32] = %RU32 (uint32_t)\n",
317	i, mpParms[i].u.uint32));
318	#endif
319	paDstParms[i].u.uint32 = mpParms[i].u.uint32;
320	break;
321
322	case VBOX_HGCM_SVC_PARM_64BIT:
323	#ifdef DEBUG_andy
324	LogFlowFunc(("\tmpParms[%RU32] = %RU64 (uint64_t)\n",
325	i, mpParms[i].u.uint64));
326	#endif
327	paDstParms[i].u.uint64 = mpParms[i].u.uint64;
328	break;
329
330	case VBOX_HGCM_SVC_PARM_PTR:
331	{
332	#ifdef DEBUG_andy
333	LogFlowFunc(("\tmpParms[%RU32] = %p (ptr), size = %RU32\n",
334	i, mpParms[i].u.pointer.addr, mpParms[i].u.pointer.size));
335	#endif
336	if (!mpParms[i].u.pointer.size)
337	continue; /* Only copy buffer if there actually is something to copy. */
338
339	if (!paDstParms[i].u.pointer.addr)
340	rc = VERR_INVALID_PARAMETER;
341
342	if ( RT_SUCCESS(rc)
343	&& paDstParms[i].u.pointer.size < mpParms[i].u.pointer.size)
344	rc = VERR_BUFFER_OVERFLOW;
345
346	if (RT_SUCCESS(rc))
347	{
348	memcpy(paDstParms[i].u.pointer.addr,
349	mpParms[i].u.pointer.addr,
350	mpParms[i].u.pointer.size);
351	}
352
353	break;
354	}
355
356	default:
357	LogFlowFunc(("Parameter %RU32 of type %RU32 is not supported yet\n",
358	i, mpParms[i].type));
359	rc = VERR_NOT_SUPPORTED;
360	break;
361	}
362	}
363
364	if (RT_FAILURE(rc))
365	{
366	LogFlowFunc(("Parameter %RU32 invalid (%Rrc), refusing\n",
367	i, rc));
368	break;
369	}
370	}
371	}
372
373	LogFlowFunc(("Returned with rc=%Rrc\n", rc));
374	return rc;
375	}
376
377	int Assign(const ClientConnection *pConnection)
378	{
379	AssertPtrReturn(pConnection, VERR_INVALID_POINTER);
380
381	int rc;
382
383	LogFlowFunc(("pHostCmd=%p, mMsgType=%RU32, mParmCount=%RU32, mpParms=%p\n",
384	this, mMsgType, mParmCount, mpParms));
385
386	/* Does the current host command need more parameter space which
387	* the client does not provide yet? */
388	if (mParmCount > pConnection->mNumParms)
389	{
390	LogFlowFunc(("pHostCmd=%p requires %RU32 parms, only got %RU32 from client\n",
391	this, mParmCount, pConnection->mNumParms));
392
393	/*
394	* So this call apparently failed because the guest wanted to peek
395	* how much parameters it has to supply in order to successfully retrieve
396	* this command. Let's tell him so!
397	*/
398	rc = VERR_TOO_MUCH_DATA;
399	}
400	else
401	{
402	rc = CopyTo(pConnection->mParms, pConnection->mNumParms);
403
404	/*
405	* Has there been enough parameter space but the wrong parameter types
406	* were submitted -- maybe the client was just asking for the next upcoming
407	* host message?
408	*
409	* Note: To keep this compatible to older clients we return VERR_TOO_MUCH_DATA
410	* in every case.
411	*/
412	if (RT_FAILURE(rc))
413	rc = VERR_TOO_MUCH_DATA;
414	}
415
416	return rc;
417	}
418
419	int Peek(const ClientConnection *pConnection)
420	{
421	AssertPtrReturn(pConnection, VERR_INVALID_POINTER);
422
423	LogFlowFunc(("pHostCmd=%p, mMsgType=%RU32, mParmCount=%RU32, mpParms=%p\n",
424	this, mMsgType, mParmCount, mpParms));
425
426	if (pConnection->mNumParms >= 2)
427	{
428	pConnection->mParms[0].setUInt32(mMsgType); /* Message ID */
429	pConnection->mParms[1].setUInt32(mParmCount); /* Required parameters for message */
430	}
431	else
432	LogFlowFunc(("Warning: Client has not (yet) submitted enough parameters (%RU32, must be at least 2) to at least peak for the next message\n",
433	pConnection->mNumParms));
434
435	/*
436	* Always return VERR_TOO_MUCH_DATA data here to
437	* keep it compatible with older clients and to
438	* have correct accounting (mHostRc + mHostCmdTries).
439	*/
440	return VERR_TOO_MUCH_DATA;
441	}
442
443	/** Reference count for keeping track how many connected
444	* clients still need to process this command until it can
445	* be removed. */
446	uint32_t mRefCount;
447	/** The context ID this command belongs to. Will be extracted
448	* always from HGCM parameter [0]. */
449	uint32_t mContextID;
450	/** Dynamic structure for holding the HGCM parms */
451	uint32_t mMsgType;
452	/** Number of HGCM parameters. */
453	uint32_t mParmCount;
454	/** Array of HGCM parameters. */
455	PVBOXHGCMSVCPARM mpParms;
456	/** Incoming timestamp (us). */
457	uint64_t mTimestamp;
458	} HostCommand;
459	typedef std::list< HostCommand *> HostCmdList;
460	typedef std::list< HostCommand *>::iterator HostCmdListIter;
461	typedef std::list< HostCommand *>::const_iterator HostCmdListIterConst;
462
463	/**
464	* Per-client structure used for book keeping/state tracking a
465	* certain host command.
466	*/
467	typedef struct ClientContext
468	{
469	/* Pointer to list node of this command. */
470	HostCommand *mpHostCmd;
471	/** The standard constructor. */
472	ClientContext(void) : mpHostCmd(NULL) {}
473	/** Internal constrcutor. */
474	ClientContext(HostCommand *pHostCmd) : mpHostCmd(pHostCmd) {}
475	} ClientContext;
476	typedef std::map< uint32_t, ClientContext > ClientContextMap;
477	typedef std::map< uint32_t, ClientContext >::iterator ClientContextMapIter;
478	typedef std::map< uint32_t, ClientContext >::const_iterator ClientContextMapIterConst;
479
480	/**
481	* Structure for holding a connected guest client
482	* state.
483	*/
484	typedef struct ClientState
485	{
486	ClientState(void)
487	: mSvcHelpers(NULL),
488	mID(0),
489	mFlags(0),
490	mFilterMask(0), mFilterValue(0),
491	mHostCmdRc(VINF_SUCCESS), mHostCmdTries(0),
492	mHostCmdTS(0),
493	mIsPending(false),
494	mPeekCount(0) { }
495
496	ClientState(PVBOXHGCMSVCHELPERS pSvcHelpers, uint32_t uClientID)
497	: mSvcHelpers(pSvcHelpers),
498	mID(uClientID),
499	mFlags(0),
500	mFilterMask(0), mFilterValue(0),
501	mHostCmdRc(VINF_SUCCESS), mHostCmdTries(0),
502	mHostCmdTS(0),
503	mIsPending(false),
504	mPeekCount(0){ }
505
506	void DequeueAll(void)
507	{
508	HostCmdListIter curItem = mHostCmdList.begin();
509	while (curItem != mHostCmdList.end())
510	curItem = Dequeue(curItem);
511	}
512
513	void DequeueCurrent(void)
514	{
515	HostCmdListIter curCmd = mHostCmdList.begin();
516	if (curCmd != mHostCmdList.end())
517	Dequeue(curCmd);
518	}
519
520	HostCmdListIter Dequeue(HostCmdListIter &curItem)
521	{
522	HostCommand pHostCmd = (curItem);
523	AssertPtr(pHostCmd);
524
525	if (pHostCmd->Release() == 0)
526	{
527	LogFlowFunc(("[Client %RU32] Destroying pHostCmd=%p\n",
528	mID, (*curItem)));
529
530	delete pHostCmd;
531	pHostCmd = NULL;
532	}
533
534	HostCmdListIter nextItem = mHostCmdList.erase(curItem);
535
536	/* Reset everything else. */
537	mHostCmdRc = VINF_SUCCESS;
538	mHostCmdTries = 0;
539	mPeekCount = 0;
540
541	return nextItem;
542	}
543
544	int EnqueueCommand(HostCommand *pHostCmd)
545	{
546	AssertPtrReturn(pHostCmd, VERR_INVALID_POINTER);
547
548	int rc = VINF_SUCCESS;
549
550	try
551	{
552	mHostCmdList.push_back(pHostCmd);
553	pHostCmd->AddRef();
554	}
555	catch (std::bad_alloc)
556	{
557	rc = VERR_NO_MEMORY;
558	}
559
560	return rc;
561	}
562
563	bool WantsHostCommand(const HostCommand *pHostCmd) const
564	{
565	AssertPtrReturn(pHostCmd, false);
566
567	#ifdef DEBUG_andy
568	LogFlowFunc(("mHostCmdTS=%RU64, pHostCmdTS=%RU64\n",
569	mHostCmdTS, pHostCmd->mTimestamp));
570	#endif
571
572	/* Only process newer commands. */
573	if (pHostCmd->mTimestamp <= mHostCmdTS)
574	return false;
575
576	/*
577	* If a sesseion filter is set, only obey those commands we're interested in
578	* by applying our context ID filter mask and compare the result with the
579	* original context ID.
580	*/
581	bool fWant;
582	if (mFlags & CLIENTSTATE_FLAG_CONTEXTFILTER)
583	{
584	fWant = (pHostCmd->mContextID & mFilterMask) == mFilterValue;
585	}
586	else /* Client is interested in all commands. */
587	fWant = true;
588
589	LogFlowFunc(("[Client %RU32] mFlags=0x%x, mContextID=%RU32 (session %RU32), mFilterMask=0x%x, mFilterValue=%RU32, fWant=%RTbool\n",
590	mID, mFlags, pHostCmd->mContextID,
591	VBOX_GUESTCTRL_CONTEXTID_GET_SESSION(pHostCmd->mContextID),
592	mFilterMask, mFilterValue, fWant));
593
594	return fWant;
595	}
596
597	int SetPending(const ClientConnection *pConnection)
598	{
599	AssertPtrReturn(pConnection, VERR_INVALID_POINTER);
600
601	if (mIsPending)
602	{
603	LogFlowFunc(("[Client %RU32] Already is in pending mode\n", mID));
604
605	/*
606	* Signal that we don't and can't return yet.
607	*/
608	return VINF_HGCM_ASYNC_EXECUTE;
609	}
610
611	if (mHostCmdList.empty())
612	{
613	AssertMsg(mIsPending == false,
614	("Client ID=%RU32 already is pending but tried to receive a new host command\n", mID));
615
616	mPendingCon.mHandle = pConnection->mHandle;
617	mPendingCon.mNumParms = pConnection->mNumParms;
618	mPendingCon.mParms = pConnection->mParms;
619
620	mIsPending = true;
621
622	LogFlowFunc(("[Client %RU32] Is now in pending mode\n", mID));
623
624	/*
625	* Signal that we don't and can't return yet.
626	*/
627	return VINF_HGCM_ASYNC_EXECUTE;
628	}
629
630	/*
631	* Signal that there already is a connection pending.
632	* Shouldn't happen in daily usage.
633	*/
634	AssertMsgFailed(("Client already has a connection pending\n"));
635	return VERR_SIGNAL_PENDING;
636	}
637
638	int Run(const ClientConnection *pConnection,
639	HostCommand *pHostCmd)
640	{
641	AssertPtrReturn(pConnection, VERR_INVALID_POINTER);
642	AssertPtrReturn(pHostCmd, VERR_INVALID_POINTER);
643
644	int rc = VINF_SUCCESS;
645
646	LogFlowFunc(("[Client %RU32] pConnection=%p, mHostCmdRc=%Rrc, mHostCmdTries=%RU32, mPeekCount=%RU32\n",
647	mID, pConnection, mHostCmdRc, mHostCmdTries, mPeekCount));
648
649	mHostCmdRc = SendReply(pConnection, pHostCmd);
650	LogFlowFunc(("[Client %RU32] Processing pHostCmd=%p ended with rc=%Rrc\n",
651	mID, pHostCmd, mHostCmdRc));
652
653	bool fRemove = false;
654	if (RT_FAILURE(mHostCmdRc))
655	{
656	mHostCmdTries++;
657
658	/*
659	* If the client understood the message but supplied too little buffer space
660	* don't send this message again and drop it after 6 unsuccessful attempts.
661	*
662	* Note: Due to legacy reasons this the retry counter has to be even because on
663	* every peek there will be the actual command retrieval from the client side.
664	* To not get the actual command if the client actually only wants to peek for
665	* the next command, there needs to be two rounds per try, e.g. 3 rounds = 6 tries.
666	*
667	** @todo Fix the mess stated above. GUEST_MSG_WAIT should be become GUEST_MSG_PEEK, only
668	* (and every time) returning the next upcoming host command (if any, blocking). Then
669	* it's up to the client what to do next, either peeking again or getting the actual
670	* host command via an own GUEST_ type message.
671	*/
672	if (mHostCmdRc == VERR_TOO_MUCH_DATA)
673	{
674	if (mHostCmdTries == 6)
675	fRemove = true;
676	}
677	/* Client did not understand the message or something else weird happened. Try again one
678	* more time and drop it if it didn't get handled then. */
679	else if (mHostCmdTries > 1)
680	fRemove = true;
681	}
682	else
683	fRemove = true; /* Everything went fine, remove it. */
684
685	LogFlowFunc(("[Client %RU32] Tried pHostCmd=%p for %RU32 times, (last result=%Rrc, fRemove=%RTbool)\n",
686	mID, pHostCmd, mHostCmdTries, mHostCmdRc, fRemove));
687
688	if (RT_SUCCESS(rc))
689	rc = mHostCmdRc;
690
691	if (fRemove)
692	{
693	/** @todo Fix this (slow) lookup. Too late today. */
694	HostCmdListIter curItem = mHostCmdList.begin();
695	while (curItem != mHostCmdList.end())
696	{
697	if ((*curItem) == pHostCmd)
698	{
699	Dequeue(curItem);
700	break;
701	}
702
703	curItem++;
704	}
705	}
706
707	LogFlowFunc(("[Client %RU32] Returned with rc=%Rrc\n", mID, rc));
708	return rc;
709	}
710
711	int RunCurrent(const ClientConnection *pConnection)
712	{
713	AssertPtrReturn(pConnection, VERR_INVALID_POINTER);
714
715	int rc;
716	if (mHostCmdList.empty())
717	{
718	rc = SetPending(pConnection);
719	}
720	else
721	{
722	AssertMsgReturn(!mIsPending,
723	("Client ID=%RU32 still is in pending mode; can't use another connection\n", mID), VERR_INVALID_PARAMETER);
724
725	HostCmdListIter curCmd = mHostCmdList.begin();
726	Assert(curCmd != mHostCmdList.end());
727	HostCommand pHostCmd = (curCmd);
728	AssertPtrReturn(pHostCmd, VERR_INVALID_POINTER);
729
730	rc = Run(pConnection, pHostCmd);
731	}
732
733	return rc;
734	}
735
736	int Wakeup(void)
737	{
738	int rc = VINF_NO_CHANGE;
739
740	if (mIsPending)
741	{
742	LogFlowFunc(("[Client %RU32] Waking up ...\n", mID));
743
744	rc = VINF_SUCCESS;
745
746	HostCmdListIter curCmd = mHostCmdList.begin();
747	if (curCmd != mHostCmdList.end())
748	{
749	HostCommand pHostCmd = (curCmd);
750	AssertPtrReturn(pHostCmd, VERR_INVALID_POINTER);
751
752	LogFlowFunc(("[Client %RU32] Current host command is pHostCmd=%p, CID=%RU32, cmdType=%RU32, cmdParms=%RU32, refCount=%RU32\n",
753	mID, pHostCmd, pHostCmd->mContextID, pHostCmd->mMsgType, pHostCmd->mParmCount, pHostCmd->mRefCount));
754
755	rc = Run(&mPendingCon, pHostCmd);
756	}
757	else
758	AssertMsgFailed(("Waking up client ID=%RU32 with no host command in queue is a bad idea\n", mID));
759
760	return rc;
761	}
762
763	return VINF_NO_CHANGE;
764	}
765
766	int CancelWaiting(int rcPending)
767	{
768	LogFlowFunc(("[Client %RU32] Cancelling waiting with %Rrc, isPending=%RTbool, pendingNumParms=%RU32, flags=%x\n",
769	mID, rcPending, mIsPending, mPendingCon.mNumParms, mFlags));
770
771	int rc;
772	if ( mIsPending
773	&& mPendingCon.mNumParms >= 2)
774	{
775	mPendingCon.mParms[0].setUInt32(HOST_CANCEL_PENDING_WAITS); /* Message ID. */
776	mPendingCon.mParms[1].setUInt32(0); /* Required parameters for message. */
777
778	AssertPtr(mSvcHelpers);
779	mSvcHelpers->pfnCallComplete(mPendingCon.mHandle, rcPending);
780
781	mIsPending = false;
782
783	rc = VINF_SUCCESS;
784	}
785	else if (mPendingCon.mNumParms < 2)
786	rc = VERR_BUFFER_OVERFLOW;
787	else /** @todo Enqueue command instead of dropping? */
788	rc = VERR_WRONG_ORDER;
789
790	return rc;
791	}
792
793	int SendReply(const ClientConnection *pConnection,
794	HostCommand *pHostCmd)
795	{
796	AssertPtrReturn(pConnection, VERR_INVALID_POINTER);
797	AssertPtrReturn(pHostCmd, VERR_INVALID_POINTER);
798
799	int rc;
800	/* If the client is in pending mode, always send back
801	* the peek result first. */
802	if (mIsPending)
803	{
804	rc = pHostCmd->Peek(pConnection);
805	mPeekCount++;
806	}
807	else
808	{
809	/* If this is the very first peek, make sure to always give back the peeking answer
810	* instead of the actual command, even if this command would fit into the current
811	* connection buffer. */
812	if (!mPeekCount)
813	{
814	rc = pHostCmd->Peek(pConnection);
815	mPeekCount++;
816	}
817	else
818	{
819	/* Try assigning the host command to the client and store the
820	* result code for later use. */
821	rc = pHostCmd->Assign(pConnection);
822	if (RT_FAILURE(rc)) /* If something failed, let the client peek (again). */
823	{
824	rc = pHostCmd->Peek(pConnection);
825	mPeekCount++;
826	}
827	else
828	mPeekCount = 0;
829	}
830	}
831
832	/* Reset pending status. */
833	mIsPending = false;
834
835	/* In any case the client did something, so complete
836	* the pending call with the result we just got. */
837	AssertPtr(mSvcHelpers);
838	mSvcHelpers->pfnCallComplete(pConnection->mHandle, rc);
839
840	LogFlowFunc(("[Client %RU32] mPeekCount=%RU32, pConnection=%p, pHostCmd=%p, replyRc=%Rrc\n",
841	mID, mPeekCount, pConnection, pHostCmd, rc));
842	return rc;
843	}
844
845	PVBOXHGCMSVCHELPERS mSvcHelpers;
846	/** The client's ID. */
847	uint32_t mID;
848	/** Client flags. @sa CLIENTSTATE_FLAG_ flags. */
849	uint32_t mFlags;
850	/** The context ID filter mask, if any. */
851	uint32_t mFilterMask;
852	/** The context ID filter value, if any. */
853	uint32_t mFilterValue;
854	/** Host command list to process. */
855	HostCmdList mHostCmdList;
856	/** Last (most recent) rc after handling the
857	* host command. */
858	int mHostCmdRc;
859	/** How many times the host service has tried to deliver this
860	* command to the according client. */
861	uint32_t mHostCmdTries;
862	/** Timestamp (us) of last host command processed. */
863	uint64_t mHostCmdTS;
864	/**
865	* Flag indicating whether the client currently is pending.
866	* This means the client waits for a new host command to reply
867	* and won't return from the waiting call until a new host
868	* command is available.
869	*/
870	bool mIsPending;
871	/**
872	* This is necessary for being compatible with older
873	* Guest Additions. In case there are commands which only
874	* have two (2) parameters and therefore would fit into the
875	* GUEST_MSG_WAIT reply immediately, we now can make sure
876	* that the client first gets back the GUEST_MSG_WAIT results
877	* first.
878	*/
879	uint32_t mPeekCount;
880	/** The client's pending connection. */
881	ClientConnection mPendingCon;
882	} ClientState;
883	typedef std::map< uint32_t, ClientState > ClientStateMap;
884	typedef std::map< uint32_t, ClientState >::iterator ClientStateMapIter;
885	typedef std::map< uint32_t, ClientState >::const_iterator ClientStateMapIterConst;
886
887	/**
888	* Class containing the shared information service functionality.
889	*/
890	class Service : public RTCNonCopyable
891	{
892
893	private:
894
895	/** Type definition for use in callback functions. */
896	typedef Service SELF;
897	/** HGCM helper functions. */
898	PVBOXHGCMSVCHELPERS mpHelpers;
899	/**
900	* Callback function supplied by the host for notification of updates
901	* to properties.
902	*/
903	PFNHGCMSVCEXT mpfnHostCallback;
904	/** User data pointer to be supplied to the host callback function. */
905	void *mpvHostData;
906	/** List containing all buffered host commands. */
907	RTLISTANCHOR mHostCmdList;
908	/** Map containing all connected clients. The primary key contains
909	* the HGCM client ID to identify the client. */
910	ClientStateMap mClientStateMap;
911	public:
912	explicit Service(PVBOXHGCMSVCHELPERS pHelpers)
913	: mpHelpers(pHelpers)
914	, mpfnHostCallback(NULL)
915	, mpvHostData(NULL)
916	{
917	RTListInit(&mHostCmdList);
918	}
919
920	/**
921	* @copydoc VBOXHGCMSVCHELPERS::pfnUnload
922	* Simply deletes the service object
923	*/
924	static DECLCALLBACK(int) svcUnload(void *pvService)
925	{
926	AssertLogRelReturn(VALID_PTR(pvService), VERR_INVALID_PARAMETER);
927	SELF pSelf = reinterpret_cast<SELF >(pvService);
928	int rc = pSelf->uninit();
929	AssertRC(rc);
930	if (RT_SUCCESS(rc))
931	delete pSelf;
932	return rc;
933	}
934
935	/**
936	* @copydoc VBOXHGCMSVCHELPERS::pfnConnect
937	* Stub implementation of pfnConnect and pfnDisconnect.
938	*/
939	static DECLCALLBACK(int) svcConnect(void *pvService,
940	uint32_t u32ClientID,
941	void *pvClient)
942	{
943	AssertLogRelReturn(VALID_PTR(pvService), VERR_INVALID_PARAMETER);
944	SELF pSelf = reinterpret_cast<SELF >(pvService);
945	AssertPtrReturn(pSelf, VERR_INVALID_POINTER);
946	return pSelf->clientConnect(u32ClientID, pvClient);
947	}
948
949	/**
950	* @copydoc VBOXHGCMSVCHELPERS::pfnConnect
951	* Stub implementation of pfnConnect and pfnDisconnect.
952	*/
953	static DECLCALLBACK(int) svcDisconnect(void *pvService,
954	uint32_t u32ClientID,
955	void *pvClient)
956	{
957	AssertLogRelReturn(VALID_PTR(pvService), VERR_INVALID_PARAMETER);
958	SELF pSelf = reinterpret_cast<SELF >(pvService);
959	AssertPtrReturn(pSelf, VERR_INVALID_POINTER);
960	return pSelf->clientDisconnect(u32ClientID, pvClient);
961	}
962
963	/**
964	* @copydoc VBOXHGCMSVCHELPERS::pfnCall
965	* Wraps to the call member function
966	*/
967	static DECLCALLBACK(void) svcCall(void * pvService,
968	VBOXHGCMCALLHANDLE callHandle,
969	uint32_t u32ClientID,
970	void *pvClient,
971	uint32_t u32Function,
972	uint32_t cParms,
973	VBOXHGCMSVCPARM paParms[])
974	{
975	AssertLogRelReturnVoid(VALID_PTR(pvService));
976	SELF pSelf = reinterpret_cast<SELF >(pvService);
977	AssertPtrReturnVoid(pSelf);
978	pSelf->call(callHandle, u32ClientID, pvClient, u32Function, cParms, paParms);
979	}
980
981	/**
982	* @copydoc VBOXHGCMSVCHELPERS::pfnHostCall
983	* Wraps to the hostCall member function
984	*/
985	static DECLCALLBACK(int) svcHostCall(void *pvService,
986	uint32_t u32Function,
987	uint32_t cParms,
988	VBOXHGCMSVCPARM paParms[])
989	{
990	AssertLogRelReturn(VALID_PTR(pvService), VERR_INVALID_PARAMETER);
991	SELF pSelf = reinterpret_cast<SELF >(pvService);
992	AssertPtrReturn(pSelf, VERR_INVALID_POINTER);
993	return pSelf->hostCall(u32Function, cParms, paParms);
994	}
995
996	/**
997	* @copydoc VBOXHGCMSVCHELPERS::pfnRegisterExtension
998	* Installs a host callback for notifications of property changes.
999	*/
1000	static DECLCALLBACK(int) svcRegisterExtension(void *pvService,
1001	PFNHGCMSVCEXT pfnExtension,
1002	void *pvExtension)
1003	{
1004	AssertLogRelReturn(VALID_PTR(pvService), VERR_INVALID_PARAMETER);
1005	SELF pSelf = reinterpret_cast<SELF >(pvService);
1006	AssertPtrReturn(pSelf, VERR_INVALID_POINTER);
1007	pSelf->mpfnHostCallback = pfnExtension;
1008	pSelf->mpvHostData = pvExtension;
1009	return VINF_SUCCESS;
1010	}
1011
1012	private:
1013
1014	int prepareExecute(uint32_t cParms, VBOXHGCMSVCPARM paParms[]);
1015	int clientConnect(uint32_t u32ClientID, void *pvClient);
1016	int clientDisconnect(uint32_t u32ClientID, void *pvClient);
1017	int clientGetCommand(uint32_t u32ClientID, VBOXHGCMCALLHANDLE callHandle, uint32_t cParms, VBOXHGCMSVCPARM paParms[]);
1018	int clientSetMsgFilterSet(uint32_t u32ClientID, VBOXHGCMCALLHANDLE callHandle, uint32_t cParms, VBOXHGCMSVCPARM paParms[]);
1019	int clientSetMsgFilterUnset(uint32_t u32ClientID, VBOXHGCMCALLHANDLE callHandle, uint32_t cParms, VBOXHGCMSVCPARM paParms[]);
1020	int clientSkipMsg(uint32_t u32ClientID, VBOXHGCMCALLHANDLE callHandle, uint32_t cParms, VBOXHGCMSVCPARM paParms[]);
1021	int cancelHostCmd(uint32_t u32ContextID);
1022	int cancelPendingWaits(uint32_t u32ClientID, int rcPending);
1023	int hostCallback(uint32_t eFunction, uint32_t cParms, VBOXHGCMSVCPARM paParms[]);
1024	int hostProcessCommand(uint32_t eFunction, uint32_t cParms, VBOXHGCMSVCPARM paParms[]);
1025	void call(VBOXHGCMCALLHANDLE callHandle, uint32_t u32ClientID, void *pvClient, uint32_t eFunction, uint32_t cParms, VBOXHGCMSVCPARM paParms[]);
1026	int hostCall(uint32_t eFunction, uint32_t cParms, VBOXHGCMSVCPARM paParms[]);
1027	int sessionClose(uint32_t u32ClientID, VBOXHGCMCALLHANDLE callHandle, uint32_t cParms, VBOXHGCMSVCPARM paParms[]);
1028	int uninit(void);
1029	};
1030
1031	/**
1032	* Handles a client which just connected.
1033	*
1034	* @return IPRT status code.
1035	* @param u32ClientID
1036	* @param pvClient
1037	*/
1038	int Service::clientConnect(uint32_t u32ClientID, void *pvClient)
1039	{
1040	LogFlowFunc(("[Client %RU32] Connected\n", u32ClientID));
1041	#ifdef VBOX_STRICT
1042	ClientStateMapIterConst it = mClientStateMap.find(u32ClientID);
1043	if (it != mClientStateMap.end())
1044	{
1045	AssertMsgFailed(("Client with ID=%RU32 already connected when it should not\n",
1046	u32ClientID));
1047	return VERR_ALREADY_EXISTS;
1048	}
1049	#endif
1050	ClientState clientState(mpHelpers, u32ClientID);
1051	mClientStateMap[u32ClientID] = clientState;
1052	/** @todo Exception handling! */
1053	return VINF_SUCCESS;
1054	}
1055
1056	/**
1057	* Handles a client which disconnected. This functiond does some
1058	* internal cleanup as well as sends notifications to the host so
1059	* that the host can do the same (if required).
1060	*
1061	* @return IPRT status code.
1062	* @param u32ClientID The client's ID of which disconnected.
1063	* @param pvClient User data, not used at the moment.
1064	*/
1065	int Service::clientDisconnect(uint32_t u32ClientID, void *pvClient)
1066	{
1067	LogFlowFunc(("[Client %RU32] Disconnected (%zu clients total)\n",
1068	u32ClientID, mClientStateMap.size()));
1069
1070	AssertMsg(mClientStateMap.size(),
1071	("No clients in list anymore when there should (client ID=%RU32)\n", u32ClientID));
1072
1073	int rc = VINF_SUCCESS;
1074
1075	ClientStateMapIter itClientState = mClientStateMap.find(u32ClientID);
1076	AssertMsg(itClientState != mClientStateMap.end(),
1077	("Client ID=%RU32 not found in client list when it should be there\n", u32ClientID));
1078
1079	if (itClientState != mClientStateMap.end())
1080	{
1081	itClientState->second.DequeueAll();
1082
1083	mClientStateMap.erase(itClientState);
1084	}
1085
1086	bool fAllClientsDisconnected = mClientStateMap.size() == 0;
1087	if (fAllClientsDisconnected)
1088	{
1089	LogFlowFunc(("All clients disconnected, cancelling all host commands ...\n"));
1090
1091	/*
1092	* If all clients disconnected we also need to make sure that all buffered
1093	* host commands need to be notified, because Main is waiting a notification
1094	* via a (multi stage) progress object.
1095	*/
1096	HostCommand *pCurCmd = RTListGetFirst(&mHostCmdList, HostCommand, Node);
1097	while (pCurCmd)
1098	{
1099	HostCommand *pNext = RTListNodeGetNext(&pCurCmd->Node, HostCommand, Node);
1100	bool fLast = RTListNodeIsLast(&mHostCmdList, &pCurCmd->Node);
1101
1102	int rc2 = cancelHostCmd(pCurCmd->mContextID);
1103	if (RT_FAILURE(rc2))
1104	{
1105	LogFlowFunc(("Cancelling host command with CID=%u (refCount=%RU32) failed with rc=%Rrc\n",
1106	pCurCmd->mContextID, pCurCmd->mRefCount, rc2));
1107	/* Keep going. */
1108	}
1109
1110	while (pCurCmd->Release())
1111	;
1112	delete pCurCmd;
1113	pCurCmd = NULL;
1114
1115	if (fLast)
1116	break;
1117
1118	pCurCmd = pNext;
1119	}
1120
1121	Assert(RTListIsEmpty(&mHostCmdList));
1122	}
1123
1124	return rc;
1125	}
1126
1127	/**
1128	* Either fills in parameters from a pending host command into our guest context or
1129	* defer the guest call until we have something from the host.
1130	*
1131	* @return IPRT status code.
1132	* @param u32ClientID The client's ID.
1133	* @param callHandle The client's call handle.
1134	* @param cParms Number of parameters.
1135	* @param paParms Array of parameters.
1136	*/
1137	int Service::clientGetCommand(uint32_t u32ClientID, VBOXHGCMCALLHANDLE callHandle,
1138	uint32_t cParms, VBOXHGCMSVCPARM paParms[])
1139	{
1140	/*
1141	* Lookup client in our list so that we can assign the context ID of
1142	* a command to that client.
1143	*/
1144	ClientStateMapIter itClientState = mClientStateMap.find(u32ClientID);
1145	AssertMsg(itClientState != mClientStateMap.end(), ("Client with ID=%RU32 not found when it should be present\n",
1146	u32ClientID));
1147	if (itClientState == mClientStateMap.end())
1148	{
1149	/* Should never happen. Complete the call on the guest side though. */
1150	AssertPtr(mpHelpers);
1151	mpHelpers->pfnCallComplete(callHandle, VERR_NOT_FOUND);
1152
1153	return VERR_NOT_FOUND;
1154	}
1155
1156	ClientState &clientState = itClientState->second;
1157
1158	/* Use the current (inbound) connection. */
1159	ClientConnection thisCon;
1160	thisCon.mHandle = callHandle;
1161	thisCon.mNumParms = cParms;
1162	thisCon.mParms = paParms;
1163
1164	return clientState.RunCurrent(&thisCon);
1165	}
1166
1167	int Service::clientSetMsgFilterSet(uint32_t u32ClientID, VBOXHGCMCALLHANDLE callHandle,
1168	uint32_t cParms, VBOXHGCMSVCPARM paParms[])
1169	{
1170	/*
1171	* Lookup client in our list so that we can assign the context ID of
1172	* a command to that client.
1173	*/
1174	ClientStateMapIter itClientState = mClientStateMap.find(u32ClientID);
1175	AssertMsg(itClientState != mClientStateMap.end(), ("Client with ID=%RU32 not found when it should be present\n",
1176	u32ClientID));
1177	if (itClientState == mClientStateMap.end())
1178	return VERR_NOT_FOUND; /* Should never happen. */
1179
1180	if (cParms != 4)
1181	return VERR_INVALID_PARAMETER;
1182
1183	uint32_t uValue, uMaskAdd, uMaskRemove;
1184	int rc = paParms[0].getUInt32(&uValue);
1185	if (RT_SUCCESS(rc))
1186	rc = paParms[1].getUInt32(&uMaskAdd);
1187	if (RT_SUCCESS(rc))
1188	rc = paParms[2].getUInt32(&uMaskRemove);
1189	/** @todo paParm[3] (flags) not used yet. */
1190	if (RT_SUCCESS(rc))
1191	{
1192	ClientState &clientState = itClientState->second;
1193
1194	clientState.mFlags \|= CLIENTSTATE_FLAG_CONTEXTFILTER;
1195	if (uMaskAdd)
1196	clientState.mFilterMask \|= uMaskAdd;
1197	if (uMaskRemove)
1198	clientState.mFilterMask &= ~uMaskRemove;
1199
1200	clientState.mFilterValue = uValue;
1201
1202	LogFlowFunc(("[Client %RU32] Setting message filterMask=0x%x, filterVal=%RU32 set (flags=0x%x, maskAdd=0x%x, maskRemove=0x%x)\n",
1203	u32ClientID, clientState.mFilterMask, clientState.mFilterValue,
1204	clientState.mFlags, uMaskAdd, uMaskRemove));
1205	}
1206
1207	return rc;
1208	}
1209
1210	int Service::clientSetMsgFilterUnset(uint32_t u32ClientID, VBOXHGCMCALLHANDLE callHandle,
1211	uint32_t cParms, VBOXHGCMSVCPARM paParms[])
1212	{
1213	/*
1214	* Lookup client in our list so that we can assign the context ID of
1215	* a command to that client.
1216	*/
1217	ClientStateMapIter itClientState = mClientStateMap.find(u32ClientID);
1218	AssertMsg(itClientState != mClientStateMap.end(), ("Client with ID=%RU32 not found when it should be present\n",
1219	u32ClientID));
1220	if (itClientState == mClientStateMap.end())
1221	return VERR_NOT_FOUND; /* Should never happen. */
1222
1223	if (cParms != 1)
1224	return VERR_INVALID_PARAMETER;
1225
1226	ClientState &clientState = itClientState->second;
1227
1228	clientState.mFlags &= ~CLIENTSTATE_FLAG_CONTEXTFILTER;
1229	clientState.mFilterMask = 0;
1230	clientState.mFilterValue = 0;
1231
1232	LogFlowFunc(("[Client %RU32} Unset message filter\n", u32ClientID));
1233	return VINF_SUCCESS;
1234	}
1235
1236	int Service::clientSkipMsg(uint32_t u32ClientID, VBOXHGCMCALLHANDLE callHandle,
1237	uint32_t cParms, VBOXHGCMSVCPARM paParms[])
1238	{
1239	/*
1240	* Lookup client in our list so that we can assign the context ID of
1241	* a command to that client.
1242	*/
1243	ClientStateMapIter itClientState = mClientStateMap.find(u32ClientID);
1244	AssertMsg(itClientState != mClientStateMap.end(), ("Client ID=%RU32 not found when it should be present\n",
1245	u32ClientID));
1246	if (itClientState == mClientStateMap.end())
1247	return VERR_NOT_FOUND; /* Should never happen. */
1248
1249	if (cParms != 1)
1250	return VERR_INVALID_PARAMETER;
1251
1252	LogFlowFunc(("[Client %RU32] Skipping current message ...\n", u32ClientID));
1253
1254	itClientState->second.DequeueCurrent();
1255
1256	return VINF_SUCCESS;
1257	}
1258
1259	/**
1260	* Cancels a buffered host command to unblock waiting on Main side
1261	* via callbacks.
1262	*
1263	* @return IPRT status code.
1264	* @param u32ContextID Context ID of host command to cancel.
1265	*/
1266	int Service::cancelHostCmd(uint32_t u32ContextID)
1267	{
1268	Assert(mpfnHostCallback);
1269
1270	LogFlowFunc(("Cancelling CID=%u ...\n", u32ContextID));
1271
1272	uint32_t cParms = 0;
1273	VBOXHGCMSVCPARM arParms[2];
1274	arParms[cParms++].setUInt32(u32ContextID);
1275
1276	return hostCallback(GUEST_DISCONNECTED, cParms, arParms);
1277	}
1278
1279	/**
1280	* Client asks itself (in another thread) to cancel all pending waits which are blocking the client
1281	* from shutting down / doing something else.
1282	*
1283	* @return IPRT status code.
1284	* @param u32ClientID The client's ID.
1285	* @param rcPending Result code for completing pending operation.
1286	*/
1287	int Service::cancelPendingWaits(uint32_t u32ClientID, int rcPending)
1288	{
1289	ClientStateMapIter itClientState = mClientStateMap.find(u32ClientID);
1290	if (itClientState != mClientStateMap.end())
1291	return itClientState->second.CancelWaiting(rcPending);
1292
1293	return VINF_SUCCESS;
1294	}
1295
1296	/**
1297	* Notifies the host (using low-level HGCM callbacks) about an event
1298	* which was sent from the client.
1299	*
1300	* @return IPRT status code.
1301	* @param eFunction Function (event) that occured.
1302	* @param cParms Number of parameters.
1303	* @param paParms Array of parameters.
1304	*/
1305	int Service::hostCallback(uint32_t eFunction, uint32_t cParms, VBOXHGCMSVCPARM paParms[])
1306	{
1307	LogFlowFunc(("eFunction=%ld, cParms=%ld, paParms=%p\n",
1308	eFunction, cParms, paParms));
1309
1310	int rc;
1311	if (mpfnHostCallback)
1312	{
1313	VBOXGUESTCTRLHOSTCALLBACK data(cParms, paParms);
1314	rc = mpfnHostCallback(mpvHostData, eFunction,
1315	(void *)(&data), sizeof(data));
1316	}
1317	else
1318	rc = VERR_NOT_SUPPORTED;
1319
1320	LogFlowFunc(("Returning rc=%Rrc\n", rc));
1321	return rc;
1322	}
1323
1324	/**
1325	* Processes a command received from the host side and re-routes it to
1326	* a connect client on the guest.
1327	*
1328	* @return IPRT status code.
1329	* @param eFunction Function code to process.
1330	* @param cParms Number of parameters.
1331	* @param paParms Array of parameters.
1332	*/
1333	int Service::hostProcessCommand(uint32_t eFunction, uint32_t cParms, VBOXHGCMSVCPARM paParms[])
1334	{
1335	/*
1336	* If no client is connected at all we don't buffer any host commands
1337	* and immediately return an error to the host. This avoids the host
1338	* waiting for a response from the guest side in case VBoxService on
1339	* the guest is not running/system is messed up somehow.
1340	*/
1341	if (mClientStateMap.size() == 0)
1342	return VERR_NOT_FOUND;
1343
1344	int rc;
1345
1346	HostCommand *pHostCmd = NULL;
1347	try
1348	{
1349	pHostCmd = new HostCommand();
1350	rc = pHostCmd->Allocate(eFunction, cParms, paParms);
1351	if (RT_SUCCESS(rc))
1352	/* rc = */ RTListAppend(&mHostCmdList, &pHostCmd->Node);
1353	}
1354	catch (std::bad_alloc)
1355	{
1356	rc = VERR_NO_MEMORY;
1357	}
1358
1359	if (RT_SUCCESS(rc))
1360	{
1361	LogFlowFunc(("Handling host command CID=%RU32, eFunction=%RU32, cParms=%RU32, paParms=%p, numClients=%zu\n",
1362	pHostCmd->mContextID, eFunction, cParms, paParms, mClientStateMap.size()));
1363
1364	/*
1365	* Wake up all pending clients which are interested in this
1366	* host command.
1367	*/
1368	#ifdef DEBUG
1369	uint32_t uClientsWokenUp = 0;
1370	#endif
1371	ClientStateMapIter itClientState = mClientStateMap.begin();
1372	AssertMsg(itClientState != mClientStateMap.end(), ("Client state map is empty when it should not\n"));
1373	while (itClientState != mClientStateMap.end())
1374	{
1375	ClientState &clientState = itClientState->second;
1376
1377	/* If a client indicates that it it wants the new host command,
1378	* add a reference to not delete it.*/
1379	if (clientState.WantsHostCommand(pHostCmd))
1380	{
1381	clientState.EnqueueCommand(pHostCmd);
1382
1383	int rc2 = clientState.Wakeup();
1384	if (RT_FAILURE(rc2))
1385	LogFlowFunc(("Waking up client ID=%RU32 failed with rc=%Rrc\n",
1386	itClientState->first, rc2));
1387	#ifdef DEBUG
1388	uClientsWokenUp++;
1389	#endif
1390	}
1391
1392	itClientState++;
1393	}
1394
1395	#ifdef DEBUG
1396	LogFlowFunc(("%RU32 clients have been woken up\n", uClientsWokenUp));
1397	#endif
1398	}
1399
1400	return rc;
1401	}
1402
1403	/**
1404	* Handle an HGCM service call.
1405	* @copydoc VBOXHGCMSVCFNTABLE::pfnCall
1406	* @note All functions which do not involve an unreasonable delay will be
1407	* handled synchronously. If needed, we will add a request handler
1408	* thread in future for those which do.
1409	*
1410	* @thread HGCM
1411	*/
1412	void Service::call(VBOXHGCMCALLHANDLE callHandle, uint32_t u32ClientID,
1413	void * /* pvClient */, uint32_t eFunction, uint32_t cParms,
1414	VBOXHGCMSVCPARM paParms[])
1415	{
1416	int rc = VINF_SUCCESS;
1417	LogFlowFunc(("[Client %RU32] eFunction=%RU32, cParms=%RU32, paParms=0x%p\n",
1418	u32ClientID, eFunction, cParms, paParms));
1419	try
1420	{
1421	/*
1422	* The guest asks the host for the next message to process.
1423	*/
1424	if (eFunction == GUEST_MSG_WAIT)
1425	{
1426	LogFlowFunc(("[Client %RU32] GUEST_MSG_GET\n", u32ClientID));
1427	rc = clientGetCommand(u32ClientID, callHandle, cParms, paParms);
1428	}
1429	else
1430	{
1431	switch (eFunction)
1432	{
1433	/*
1434	* A client wants to shut down and asks us (this service) to cancel
1435	* all blocking/pending waits (VINF_HGCM_ASYNC_EXECUTE) so that the
1436	* client can gracefully shut down.
1437	*/
1438	case GUEST_CANCEL_PENDING_WAITS:
1439	LogFlowFunc(("[Client %RU32] GUEST_CANCEL_PENDING_WAITS\n", u32ClientID));
1440	rc = cancelPendingWaits(u32ClientID, VINF_SUCCESS /* Pending result */);
1441	break;
1442
1443	/*
1444	* The guest only wants certain messages set by the filter mask(s).
1445	* Since VBox 4.3+.
1446	*/
1447	case GUEST_MSG_FILTER_SET:
1448	LogFlowFunc(("[Client %RU32] GUEST_MSG_FILTER_SET\n", u32ClientID));
1449	rc = clientSetMsgFilterSet(u32ClientID, callHandle, cParms, paParms);
1450	break;
1451
1452	/*
1453	* Unsetting the message filter flag.
1454	*/
1455	case GUEST_MSG_FILTER_UNSET:
1456	LogFlowFunc(("[Client %RU32] GUEST_MSG_FILTER_UNSET\n", u32ClientID));
1457	rc = clientSetMsgFilterUnset(u32ClientID, callHandle, cParms, paParms);
1458	break;
1459
1460	/*
1461	* The guest only wants skip the currently assigned messages. Neded
1462	* for dropping its assigned reference of the current assigned host
1463	* command in queue.
1464	* Since VBox 4.3+.
1465	*/
1466	case GUEST_MSG_SKIP:
1467	LogFlowFunc(("[Client %RU32] GUEST_MSG_SKIP\n", u32ClientID));
1468	rc = clientSkipMsg(u32ClientID, callHandle, cParms, paParms);
1469	break;
1470
1471	/*
1472	* The guest wants to close specific guest session. This is handy for
1473	* shutting down dedicated guest session processes from another process.
1474	*/
1475	case GUEST_SESSION_CLOSE:
1476	LogFlowFunc(("[Client %RU32] GUEST_SESSION_CLOSE\n", u32ClientID));
1477	rc = sessionClose(u32ClientID, callHandle, cParms, paParms);
1478	break;
1479
1480	/*
1481	* For all other regular commands we call our hostCallback
1482	* function. If the current command does not support notifications,
1483	* notifyHost will return VERR_NOT_SUPPORTED.
1484	*/
1485	default:
1486	rc = hostCallback(eFunction, cParms, paParms);
1487	break;
1488	}
1489
1490	if (rc != VINF_HGCM_ASYNC_EXECUTE)
1491	{
1492	/* Tell the client that the call is complete (unblocks waiting). */
1493	AssertPtr(mpHelpers);
1494	mpHelpers->pfnCallComplete(callHandle, rc);
1495	}
1496	}
1497	}
1498	catch (std::bad_alloc)
1499	{
1500	rc = VERR_NO_MEMORY;
1501	}
1502	}
1503
1504	/**
1505	* Service call handler for the host.
1506	* @copydoc VBOXHGCMSVCFNTABLE::pfnHostCall
1507	* @thread hgcm
1508	*/
1509	int Service::hostCall(uint32_t eFunction, uint32_t cParms, VBOXHGCMSVCPARM paParms[])
1510	{
1511	int rc = VERR_NOT_SUPPORTED;
1512	LogFlowFunc(("fn=%RU32, cParms=%RU32, paParms=0x%p\n",
1513	eFunction, cParms, paParms));
1514	try
1515	{
1516	switch (eFunction)
1517	{
1518	/**
1519	* Host
1520	*/
1521	case HOST_CANCEL_PENDING_WAITS:
1522	{
1523	LogFlowFunc(("HOST_CANCEL_PENDING_WAITS\n"));
1524	ClientStateMapIter itClientState = mClientStateMap.begin();
1525	while (itClientState != mClientStateMap.end())
1526	{
1527	int rc2 = itClientState->second.CancelWaiting(VINF_SUCCESS /* Pending rc. */);
1528	if (RT_FAILURE(rc2))
1529	LogFlowFunc(("Cancelling waiting for client ID=%RU32 failed with rc=%Rrc",
1530	itClientState->first, rc2));
1531	itClientState++;
1532	}
1533	rc = VINF_SUCCESS;
1534	break;
1535	}
1536
1537	default:
1538	rc = hostProcessCommand(eFunction, cParms, paParms);
1539	break;
1540	}
1541	}
1542	catch (std::bad_alloc)
1543	{
1544	rc = VERR_NO_MEMORY;
1545	}
1546
1547	return rc;
1548	}
1549
1550	/**
1551	* Client asks another client (guest) session to close.
1552	*
1553	* @return IPRT status code.
1554	* @param u32ClientID The client's ID.
1555	* @param callHandle The client's call handle.
1556	* @param cParms Number of parameters.
1557	* @param paParms Array of parameters.
1558	*/
1559	int Service::sessionClose(uint32_t u32ClientID, VBOXHGCMCALLHANDLE callHandle, uint32_t cParms, VBOXHGCMSVCPARM paParms[])
1560	{
1561	if (cParms < 2)
1562	return VERR_INVALID_PARAMETER;
1563
1564	uint32_t uContextID, uFlags;
1565	int rc = paParms[0].getUInt32(&uContextID);
1566	if (RT_SUCCESS(rc))
1567	rc = paParms[1].getUInt32(&uFlags);
1568
1569	uint32_t uSessionID = VBOX_GUESTCTRL_CONTEXTID_GET_SESSION(uContextID);
1570
1571	if (RT_SUCCESS(rc))
1572	rc = hostProcessCommand(HOST_SESSION_CLOSE, cParms, paParms);
1573
1574	LogFlowFunc(("Closing guest session ID=%RU32 (from client ID=%RU32) returned with rc=%Rrc\n",
1575	uSessionID, u32ClientID, rc));
1576	return rc;
1577	}
1578
1579	int Service::uninit(void)
1580	{
1581	return VINF_SUCCESS;
1582	}
1583
1584	} /* namespace guestControl */
1585
1586	using guestControl::Service;
1587
1588	/**
1589	* @copydoc VBOXHGCMSVCLOAD
1590	*/
1591	extern "C" DECLCALLBACK(DECLEXPORT(int)) VBoxHGCMSvcLoad(VBOXHGCMSVCFNTABLE *pTable)
1592	{
1593	int rc = VINF_SUCCESS;
1594
1595	LogFlowFunc(("pTable=%p\n", pTable));
1596
1597	if (!VALID_PTR(pTable))
1598	{
1599	rc = VERR_INVALID_PARAMETER;
1600	}
1601	else
1602	{
1603	LogFlowFunc(("pTable->cbSize=%d, pTable->u32Version=0x%08X\n", pTable->cbSize, pTable->u32Version));
1604
1605	if ( pTable->cbSize != sizeof (VBOXHGCMSVCFNTABLE)
1606	\|\| pTable->u32Version != VBOX_HGCM_SVC_VERSION)
1607	{
1608	rc = VERR_VERSION_MISMATCH;
1609	}
1610	else
1611	{
1612	std::auto_ptr<Service> apService;
1613	/* No exceptions may propagate outside. */
1614	try {
1615	apService = std::auto_ptr<Service>(new Service(pTable->pHelpers));
1616	} catch (int rcThrown) {
1617	rc = rcThrown;
1618	} catch (...) {
1619	rc = VERR_UNRESOLVED_ERROR;
1620	}
1621
1622	if (RT_SUCCESS(rc))
1623	{
1624	/*
1625	* We don't need an additional client data area on the host,
1626	* because we're a class which can have members for that :-).
1627	*/
1628	pTable->cbClient = 0;
1629
1630	/* Register functions. */
1631	pTable->pfnUnload = Service::svcUnload;
1632	pTable->pfnConnect = Service::svcConnect;
1633	pTable->pfnDisconnect = Service::svcDisconnect;
1634	pTable->pfnCall = Service::svcCall;
1635	pTable->pfnHostCall = Service::svcHostCall;
1636	pTable->pfnSaveState = NULL; /* The service is stateless, so the normal */
1637	pTable->pfnLoadState = NULL; /* construction done before restoring suffices */
1638	pTable->pfnRegisterExtension = Service::svcRegisterExtension;
1639
1640	/* Service specific initialization. */
1641	pTable->pvService = apService.release();
1642	}
1643	}
1644	}
1645
1646	LogFlowFunc(("Returning %Rrc\n", rc));
1647	return rc;
1648	}
1649

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source: vbox/trunk/src/VBox/HostServices/GuestControl/service.cpp@ 53399

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