service.cpp@ 34562

Last change on this file since 34562 was 33540, checked in by vboxsync, 14 years ago
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1	/* $Id: service.cpp 33540 2010-10-28 09:27:05Z vboxsync $ */
2	/** @file
3	* Guest Property Service: Host service entry points.
4	*/
5
6	/*
7	* Copyright (C) 2008 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_properties Guest Property HGCM Service
19	*
20	* This HGCM service allows the guest to set and query values in a property
21	* store on the host. The service proxies the guest requests to the service
22	* owner on the host using a request callback provided by the owner, and is
23	* notified of changes to properties made by the host. It forwards these
24	* notifications to clients in the guest which have expressed interest and
25	* are waiting for notification.
26	*
27	* The service currently consists of two threads. One of these is the main
28	* HGCM service thread which deals with requests from the guest and from the
29	* host. The second thread sends the host asynchronous notifications of
30	* changes made by the guest and deals with notification timeouts.
31	*
32	* Guest requests to wait for notification are added to a list of open
33	* notification requests and completed when a corresponding guest property
34	* is changed or when the request times out.
35	*/
36
37	/*******************************************************************************
38	* Header Files *
39	*******************************************************************************/
40	#define LOG_GROUP LOG_GROUP_HGCM
41	#include <VBox/HostServices/GuestPropertySvc.h>
42
43	#include <VBox/log.h>
44	#include <iprt/asm.h>
45	#include <iprt/assert.h>
46	#include <iprt/cpp/autores.h>
47	#include <iprt/cpp/utils.h>
48	#include <iprt/err.h>
49	#include <iprt/mem.h>
50	#include <iprt/req.h>
51	#include <iprt/string.h>
52	#include <iprt/thread.h>
53	#include <iprt/time.h>
54
55	#include <memory> /* for auto_ptr */
56	#include <string>
57	#include <list>
58
59	namespace guestProp {
60
61	/**
62	* Structure for holding a property
63	*/
64	struct Property
65	{
66	/** The name of the property */
67	std::string mName;
68	/** The property value */
69	std::string mValue;
70	/** The timestamp of the property */
71	uint64_t mTimestamp;
72	/** The property flags */
73	uint32_t mFlags;
74
75	/** Default constructor */
76	Property() : mTimestamp(0), mFlags(NILFLAG) {}
77	/** Constructor with const char * */
78	Property(const char pcszName, const char pcszValue,
79	uint64_t u64Timestamp, uint32_t u32Flags)
80	: mName(pcszName), mValue(pcszValue), mTimestamp(u64Timestamp),
81	mFlags(u32Flags) {}
82	/** Constructor with std::string */
83	Property(std::string name, std::string value, uint64_t u64Timestamp,
84	uint32_t u32Flags)
85	: mName(name), mValue(value), mTimestamp(u64Timestamp),
86	mFlags(u32Flags) {}
87
88	/** Does the property name match one of a set of patterns? */
89	bool Matches(const char *pszPatterns) const
90	{
91	return ( pszPatterns[0] == '\0' /* match all */
92	\|\| RTStrSimplePatternMultiMatch(pszPatterns, RTSTR_MAX,
93	mName.c_str(), RTSTR_MAX,
94	NULL)
95	);
96	}
97
98	/** Are two properties equal? */
99	bool operator==(const Property &prop)
100	{
101	if (mTimestamp != prop.mTimestamp)
102	return false;
103	if (mFlags != prop.mFlags)
104	return false;
105	if (mName != prop.mName)
106	return false;
107	if (mValue != prop.mValue)
108	return false;
109	return true;
110	}
111
112	/* Is the property nil? */
113	bool isNull()
114	{
115	return mName.empty();
116	}
117	};
118	/** The properties list type */
119	typedef std::list <Property> PropertyList;
120
121	/**
122	* Structure for holding an uncompleted guest call
123	*/
124	struct GuestCall
125	{
126	/** The call handle */
127	VBOXHGCMCALLHANDLE mHandle;
128	/** The function that was requested */
129	uint32_t mFunction;
130	/** The call parameters */
131	VBOXHGCMSVCPARM *mParms;
132	/** The default return value, used for passing warnings */
133	int mRc;
134
135	/** The standard constructor */
136	GuestCall() : mFunction(0) {}
137	/** The normal constructor */
138	GuestCall(VBOXHGCMCALLHANDLE aHandle, uint32_t aFunction,
139	VBOXHGCMSVCPARM aParms[], int aRc)
140	: mHandle(aHandle), mFunction(aFunction), mParms(aParms),
141	mRc(aRc) {}
142	};
143	/** The guest call list type */
144	typedef std::list <GuestCall> CallList;
145
146	/**
147	* Class containing the shared information service functionality.
148	*/
149	class Service : public iprt::non_copyable
150	{
151	private:
152	/** Type definition for use in callback functions */
153	typedef Service SELF;
154	/** HGCM helper functions. */
155	PVBOXHGCMSVCHELPERS mpHelpers;
156	/** Global flags for the service */
157	ePropFlags meGlobalFlags;
158	/** The property list */
159	PropertyList mProperties;
160	/** The list of property changes for guest notifications */
161	PropertyList mGuestNotifications;
162	/** The list of outstanding guest notification calls */
163	CallList mGuestWaiters;
164	/** @todo we should have classes for thread and request handler thread */
165	/** Callback function supplied by the host for notification of updates
166	* to properties */
167	PFNHGCMSVCEXT mpfnHostCallback;
168	/** User data pointer to be supplied to the host callback function */
169	void *mpvHostData;
170	/** The previous timestamp.
171	* This is used by getCurrentTimestamp() to decrease the chance of
172	* generating duplicate timestamps. */
173	uint64_t mPrevTimestamp;
174	/** The number of consecutive timestamp adjustments that we've made.
175	* Together with mPrevTimestamp, this defines a set of obsolete timestamp
176	* values: {(mPrevTimestamp - mcTimestampAdjustments), ..., mPrevTimestamp} */
177	uint64_t mcTimestampAdjustments;
178
179	/**
180	* Get the next property change notification from the queue of saved
181	* notification based on the timestamp of the last notification seen.
182	* Notifications will only be reported if the property name matches the
183	* pattern given.
184	*
185	* @returns iprt status value
186	* @returns VWRN_NOT_FOUND if the last notification was not found in the queue
187	* @param pszPatterns the patterns to match the property name against
188	* @param u64Timestamp the timestamp of the last notification
189	* @param pProp where to return the property found. If none is
190	* found this will be set to nil.
191	* @thread HGCM
192	*/
193	int getOldNotification(const char *pszPatterns, uint64_t u64Timestamp,
194	Property *pProp)
195	{
196	AssertPtrReturn(pszPatterns, VERR_INVALID_POINTER);
197	/* Zero means wait for a new notification. */
198	AssertReturn(u64Timestamp != 0, VERR_INVALID_PARAMETER);
199	AssertPtrReturn(pProp, VERR_INVALID_POINTER);
200	int rc = getOldNotificationInternal(pszPatterns, u64Timestamp, pProp);
201	#ifdef VBOX_STRICT
202	/*
203	* ENSURE that pProp is the first event in the notification queue that:
204	* - Appears later than u64Timestamp
205	* - Matches the pszPatterns
206	*/
207	/** @todo r=bird: This incorrectly ASSUMES that mTimestamp is unique.
208	* The timestamp resolution can be very coarse on windows for instance. */
209	PropertyList::const_iterator it = mGuestNotifications.begin();
210	for (; it != mGuestNotifications.end()
211	&& it->mTimestamp != u64Timestamp; ++it)
212	{}
213	if (it == mGuestNotifications.end()) /* Not found */
214	it = mGuestNotifications.begin();
215	else
216	++it; /* Next event */
217	for (; it != mGuestNotifications.end()
218	&& it->mTimestamp != pProp->mTimestamp; ++it)
219	Assert(!it->Matches(pszPatterns));
220	if (pProp->mTimestamp != 0)
221	{
222	Assert(pProp == it);
223	Assert(pProp->Matches(pszPatterns));
224	}
225	#endif /* VBOX_STRICT */
226	return rc;
227	}
228
229	/**
230	* Check whether we have permission to change a property.
231	*
232	* @returns Strict VBox status code.
233	* @retval VINF_SUCCESS if we do.
234	* @retval VERR_PERMISSION_DENIED if the value is read-only for the requesting
235	* side.
236	* @retval VINF_PERMISSION_DENIED if the side is globally marked read-only.
237	*
238	* @param eFlags the flags on the property in question
239	* @param isGuest is the guest or the host trying to make the change?
240	*/
241	int checkPermission(ePropFlags eFlags, bool isGuest)
242	{
243	if (eFlags & (isGuest ? RDONLYGUEST : RDONLYHOST))
244	return VERR_PERMISSION_DENIED;
245	if (isGuest && (meGlobalFlags & RDONLYGUEST))
246	return VINF_PERMISSION_DENIED;
247	return VINF_SUCCESS;
248	}
249
250	public:
251	explicit Service(PVBOXHGCMSVCHELPERS pHelpers)
252	: mpHelpers(pHelpers)
253	, meGlobalFlags(NILFLAG)
254	, mpfnHostCallback(NULL)
255	, mpvHostData(NULL)
256	, mPrevTimestamp(0)
257	, mcTimestampAdjustments(0)
258	{ }
259
260	/**
261	* @copydoc VBOXHGCMSVCHELPERS::pfnUnload
262	* Simply deletes the service object
263	*/
264	static DECLCALLBACK(int) svcUnload (void *pvService)
265	{
266	AssertLogRelReturn(VALID_PTR(pvService), VERR_INVALID_PARAMETER);
267	SELF pSelf = reinterpret_cast<SELF >(pvService);
268	int rc = pSelf->uninit();
269	AssertRC(rc);
270	if (RT_SUCCESS(rc))
271	delete pSelf;
272	return rc;
273	}
274
275	/**
276	* @copydoc VBOXHGCMSVCHELPERS::pfnConnect
277	* Stub implementation of pfnConnect and pfnDisconnect.
278	*/
279	static DECLCALLBACK(int) svcConnectDisconnect (void * /* pvService */,
280	uint32_t /* u32ClientID */,
281	void * /* pvClient */)
282	{
283	return VINF_SUCCESS;
284	}
285
286	/**
287	* @copydoc VBOXHGCMSVCHELPERS::pfnCall
288	* Wraps to the call member function
289	*/
290	static DECLCALLBACK(void) svcCall (void * pvService,
291	VBOXHGCMCALLHANDLE callHandle,
292	uint32_t u32ClientID,
293	void *pvClient,
294	uint32_t u32Function,
295	uint32_t cParms,
296	VBOXHGCMSVCPARM paParms[])
297	{
298	AssertLogRelReturnVoid(VALID_PTR(pvService));
299	LogFlowFunc (("pvService=%p, callHandle=%p, u32ClientID=%u, pvClient=%p, u32Function=%u, cParms=%u, paParms=%p\n", pvService, callHandle, u32ClientID, pvClient, u32Function, cParms, paParms));
300	SELF pSelf = reinterpret_cast<SELF >(pvService);
301	pSelf->call(callHandle, u32ClientID, pvClient, u32Function, cParms, paParms);
302	LogFlowFunc (("returning\n"));
303	}
304
305	/**
306	* @copydoc VBOXHGCMSVCHELPERS::pfnHostCall
307	* Wraps to the hostCall member function
308	*/
309	static DECLCALLBACK(int) svcHostCall (void *pvService,
310	uint32_t u32Function,
311	uint32_t cParms,
312	VBOXHGCMSVCPARM paParms[])
313	{
314	AssertLogRelReturn(VALID_PTR(pvService), VERR_INVALID_PARAMETER);
315	LogFlowFunc (("pvService=%p, u32Function=%u, cParms=%u, paParms=%p\n", pvService, u32Function, cParms, paParms));
316	SELF pSelf = reinterpret_cast<SELF >(pvService);
317	int rc = pSelf->hostCall(u32Function, cParms, paParms);
318	LogFlowFunc (("rc=%Rrc\n", rc));
319	return rc;
320	}
321
322	/**
323	* @copydoc VBOXHGCMSVCHELPERS::pfnRegisterExtension
324	* Installs a host callback for notifications of property changes.
325	*/
326	static DECLCALLBACK(int) svcRegisterExtension (void *pvService,
327	PFNHGCMSVCEXT pfnExtension,
328	void *pvExtension)
329	{
330	AssertLogRelReturn(VALID_PTR(pvService), VERR_INVALID_PARAMETER);
331	SELF pSelf = reinterpret_cast<SELF >(pvService);
332	pSelf->mpfnHostCallback = pfnExtension;
333	pSelf->mpvHostData = pvExtension;
334	return VINF_SUCCESS;
335	}
336	private:
337	static DECLCALLBACK(int) reqThreadFn(RTTHREAD ThreadSelf, void *pvUser);
338	uint64_t getCurrentTimestamp(void);
339	int validateName(const char *pszName, uint32_t cbName);
340	int validateValue(const char *pszValue, uint32_t cbValue);
341	int setPropertyBlock(uint32_t cParms, VBOXHGCMSVCPARM paParms[]);
342	int getProperty(uint32_t cParms, VBOXHGCMSVCPARM paParms[]);
343	int setProperty(uint32_t cParms, VBOXHGCMSVCPARM paParms[], bool isGuest);
344	int delProperty(uint32_t cParms, VBOXHGCMSVCPARM paParms[], bool isGuest);
345	int enumProps(uint32_t cParms, VBOXHGCMSVCPARM paParms[]);
346	int getNotification(VBOXHGCMCALLHANDLE callHandle, uint32_t cParms,
347	VBOXHGCMSVCPARM paParms[]);
348	int getOldNotificationInternal(const char *pszPattern,
349	uint64_t u64Timestamp, Property *pProp);
350	int getNotificationWriteOut(VBOXHGCMSVCPARM paParms[], Property prop);
351	void doNotifications(const char *pszProperty, uint64_t u64Timestamp);
352	int notifyHost(const char pszName, const char pszValue,
353	uint64_t u64Timestamp, const char *pszFlags);
354
355	void call (VBOXHGCMCALLHANDLE callHandle, uint32_t u32ClientID,
356	void *pvClient, uint32_t eFunction, uint32_t cParms,
357	VBOXHGCMSVCPARM paParms[]);
358	int hostCall (uint32_t eFunction, uint32_t cParms, VBOXHGCMSVCPARM paParms[]);
359	int uninit ();
360	};
361
362
363	/**
364	* Gets the current timestamp.
365	*
366	* Since the RTTimeNow resolution can be very coarse, this method takes some
367	* simple steps to try avoid returning the same timestamp for two consecutive
368	* calls. Code like getOldNotification() more or less assumes unique
369	* timestamps.
370	*
371	* @returns Nanosecond timestamp.
372	*/
373	uint64_t Service::getCurrentTimestamp(void)
374	{
375	RTTIMESPEC time;
376	uint64_t u64NanoTS = RTTimeSpecGetNano(RTTimeNow(&time));
377	if (mPrevTimestamp - u64NanoTS > mcTimestampAdjustments)
378	mcTimestampAdjustments = 0;
379	else
380	{
381	mcTimestampAdjustments++;
382	u64NanoTS = mPrevTimestamp + 1;
383	}
384	this->mPrevTimestamp = u64NanoTS;
385	return u64NanoTS;
386	}
387
388	/**
389	* Check that a string fits our criteria for a property name.
390	*
391	* @returns IPRT status code
392	* @param pszName the string to check, must be valid Utf8
393	* @param cbName the number of bytes @a pszName points to, including the
394	* terminating '\0'
395	* @thread HGCM
396	*/
397	int Service::validateName(const char *pszName, uint32_t cbName)
398	{
399	LogFlowFunc(("cbName=%d\n", cbName));
400	int rc = VINF_SUCCESS;
401	if (RT_SUCCESS(rc) && (cbName < 2))
402	rc = VERR_INVALID_PARAMETER;
403	for (unsigned i = 0; RT_SUCCESS(rc) && i < cbName; ++i)
404	if (pszName[i] == '*' \|\| pszName[i] == '?' \|\| pszName[i] == '\|')
405	rc = VERR_INVALID_PARAMETER;
406	LogFlowFunc(("returning %Rrc\n", rc));
407	return rc;
408	}
409
410
411	/**
412	* Check a string fits our criteria for the value of a guest property.
413	*
414	* @returns IPRT status code
415	* @param pszValue the string to check, must be valid Utf8
416	* @param cbValue the length in bytes of @a pszValue, including the
417	* terminator
418	* @thread HGCM
419	*/
420	int Service::validateValue(const char *pszValue, uint32_t cbValue)
421	{
422	LogFlowFunc(("cbValue=%d\n", cbValue));
423
424	int rc = VINF_SUCCESS;
425	if (RT_SUCCESS(rc) && cbValue == 0)
426	rc = VERR_INVALID_PARAMETER;
427	if (RT_SUCCESS(rc))
428	LogFlow((" pszValue=%s\n", cbValue > 0 ? pszValue : NULL));
429	LogFlowFunc(("returning %Rrc\n", rc));
430	return rc;
431	}
432
433	/**
434	* Set a block of properties in the property registry, checking the validity
435	* of the arguments passed.
436	*
437	* @returns iprt status value
438	* @param cParms the number of HGCM parameters supplied
439	* @param paParms the array of HGCM parameters
440	* @thread HGCM
441	*/
442	int Service::setPropertyBlock(uint32_t cParms, VBOXHGCMSVCPARM paParms[])
443	{
444	char ppNames, ppValues, **ppFlags;
445	uint64_t *pTimestamps;
446	uint32_t cbDummy;
447	int rc = VINF_SUCCESS;
448
449	/*
450	* Get and validate the parameters
451	*/
452	if ( (cParms != 4)
453	\|\| RT_FAILURE(paParms[0].getPointer ((void **) &ppNames, &cbDummy))
454	\|\| RT_FAILURE(paParms[1].getPointer ((void **) &ppValues, &cbDummy))
455	\|\| RT_FAILURE(paParms[2].getPointer ((void **) &pTimestamps, &cbDummy))
456	\|\| RT_FAILURE(paParms[3].getPointer ((void **) &ppFlags, &cbDummy))
457	)
458	rc = VERR_INVALID_PARAMETER;
459
460	/*
461	* Add the properties to the end of the list. If we succeed then we
462	* will remove duplicates afterwards.
463	*/
464	/* Remember the last property before we started adding, for rollback or
465	* cleanup. */
466	PropertyList::iterator itEnd = mProperties.end();
467	if (!mProperties.empty())
468	--itEnd;
469	try
470	{
471	for (unsigned i = 0; RT_SUCCESS(rc) && ppNames[i] != NULL; ++i)
472	{
473	uint32_t fFlags;
474	if ( !VALID_PTR(ppNames[i])
475	\|\| !VALID_PTR(ppValues[i])
476	\|\| !VALID_PTR(ppFlags[i])
477	)
478	rc = VERR_INVALID_POINTER;
479	if (RT_SUCCESS(rc))
480	rc = validateFlags(ppFlags[i], &fFlags);
481	if (RT_SUCCESS(rc))
482	mProperties.push_back(Property(ppNames[i], ppValues[i],
483	pTimestamps[i], fFlags));
484	}
485	}
486	catch (std::bad_alloc)
487	{
488	rc = VERR_NO_MEMORY;
489	}
490
491	/*
492	* If all went well then remove the duplicate elements.
493	*/
494	if (RT_SUCCESS(rc) && itEnd != mProperties.end())
495	{
496	++itEnd;
497	for (unsigned i = 0; ppNames[i] != NULL; ++i)
498	for (PropertyList::iterator it = mProperties.begin(); it != itEnd; ++it)
499	if (it->mName.compare(ppNames[i]) == 0)
500	{
501	mProperties.erase(it);
502	break;
503	}
504	}
505
506	/*
507	* If something went wrong then rollback. This is possible because we
508	* haven't deleted anything yet.
509	*/
510	if (RT_FAILURE(rc))
511	{
512	if (itEnd != mProperties.end())
513	++itEnd;
514	mProperties.erase(itEnd, mProperties.end());
515	}
516	return rc;
517	}
518
519	/**
520	* Retrieve a value from the property registry by name, checking the validity
521	* of the arguments passed. If the guest has not allocated enough buffer
522	* space for the value then we return VERR_OVERFLOW and set the size of the
523	* buffer needed in the "size" HGCM parameter. If the name was not found at
524	* all, we return VERR_NOT_FOUND.
525	*
526	* @returns iprt status value
527	* @param cParms the number of HGCM parameters supplied
528	* @param paParms the array of HGCM parameters
529	* @thread HGCM
530	*/
531	int Service::getProperty(uint32_t cParms, VBOXHGCMSVCPARM paParms[])
532	{
533	int rc = VINF_SUCCESS;
534	const char pcszName = NULL; / shut up gcc */
535	char *pchBuf;
536	uint32_t cchName, cchBuf;
537	char szFlags[MAX_FLAGS_LEN];
538
539	/*
540	* Get and validate the parameters
541	*/
542	LogFlowThisFunc(("\n"));
543	if ( cParms != 4 /* Hardcoded value as the next lines depend on it. */
544	\|\| RT_FAILURE (paParms[0].getString(&pcszName, &cchName)) /* name */
545	\|\| RT_FAILURE (paParms[1].getBuffer((void *) &pchBuf, &cchBuf)) / buffer */
546	)
547	rc = VERR_INVALID_PARAMETER;
548	else
549	rc = validateName(pcszName, cchName);
550
551	/*
552	* Read and set the values we will return
553	*/
554
555	/* Get the value size */
556	PropertyList::const_iterator it;
557	if (RT_SUCCESS(rc))
558	{
559	rc = VERR_NOT_FOUND;
560	for (it = mProperties.begin(); it != mProperties.end(); ++it)
561	if (it->mName.compare(pcszName) == 0)
562	{
563	rc = VINF_SUCCESS;
564	break;
565	}
566	}
567	if (RT_SUCCESS(rc))
568	rc = writeFlags(it->mFlags, szFlags);
569	if (RT_SUCCESS(rc))
570	{
571	/* Check that the buffer is big enough */
572	size_t cchBufActual = it->mValue.size() + 1 + strlen(szFlags);
573	paParms[3].setUInt32 ((uint32_t)cchBufActual);
574	if (cchBufActual <= cchBuf)
575	{
576	/* Write the value, flags and timestamp */
577	it->mValue.copy(pchBuf, cchBuf, 0);
578	pchBuf[it->mValue.size()] = '\0'; /* Terminate the value */
579	strcpy(pchBuf + it->mValue.size() + 1, szFlags);
580	paParms[2].setUInt64 (it->mTimestamp);
581
582	/*
583	* Done! Do exit logging and return.
584	*/
585	Log2(("Queried string %s, value=%s, timestamp=%lld, flags=%s\n",
586	pcszName, it->mValue.c_str(), it->mTimestamp, szFlags));
587	}
588	else
589	rc = VERR_BUFFER_OVERFLOW;
590	}
591
592	LogFlowThisFunc(("rc = %Rrc\n", rc));
593	return rc;
594	}
595
596	/**
597	* Set a value in the property registry by name, checking the validity
598	* of the arguments passed.
599	*
600	* @returns iprt status value
601	* @param cParms the number of HGCM parameters supplied
602	* @param paParms the array of HGCM parameters
603	* @param isGuest is this call coming from the guest (or the host)?
604	* @throws std::bad_alloc if an out of memory condition occurs
605	* @thread HGCM
606	*/
607	int Service::setProperty(uint32_t cParms, VBOXHGCMSVCPARM paParms[], bool isGuest)
608	{
609	int rc = VINF_SUCCESS;
610	const char pcszName = NULL; / shut up gcc */
611	const char pcszValue = NULL; / ditto */
612	const char *pcszFlags = NULL;
613	uint32_t cchName = 0; /* ditto */
614	uint32_t cchValue = 0; /* ditto */
615	uint32_t cchFlags = 0;
616	uint32_t fFlags = NILFLAG;
617	uint64_t u64TimeNano = getCurrentTimestamp();
618
619	LogFlowThisFunc(("\n"));
620	/*
621	* First of all, make sure that we won't exceed the maximum number of properties.
622	*/
623	if (mProperties.size() >= MAX_PROPS)
624	rc = VERR_TOO_MUCH_DATA;
625
626	/*
627	* General parameter correctness checking.
628	*/
629	if ( RT_SUCCESS(rc)
630	&& ( (cParms < 2) \|\| (cParms > 3) /* Hardcoded value as the next lines depend on it. */
631	\|\| RT_FAILURE(paParms[0].getString(&pcszName, &cchName)) /* name */
632	\|\| RT_FAILURE(paParms[1].getString(&pcszValue, &cchValue)) /* value */
633	\|\| ( (3 == cParms)
634	&& RT_FAILURE(paParms[2].getString(&pcszFlags, &cchFlags)) /* flags */
635	)
636	)
637	)
638	rc = VERR_INVALID_PARAMETER;
639
640	/*
641	* Check the values passed in the parameters for correctness.
642	*/
643	if (RT_SUCCESS(rc))
644	rc = validateName(pcszName, cchName);
645	if (RT_SUCCESS(rc))
646	rc = validateValue(pcszValue, cchValue);
647	if ((3 == cParms) && RT_SUCCESS(rc))
648	rc = RTStrValidateEncodingEx(pcszFlags, cchFlags,
649	RTSTR_VALIDATE_ENCODING_ZERO_TERMINATED);
650	if ((3 == cParms) && RT_SUCCESS(rc))
651	rc = validateFlags(pcszFlags, &fFlags);
652	if (RT_SUCCESS(rc))
653	{
654	/*
655	* If the property already exists, check its flags to see if we are allowed
656	* to change it.
657	*/
658	PropertyList::iterator it;
659	bool found = false;
660	for (it = mProperties.begin(); it != mProperties.end(); ++it)
661	if (it->mName.compare(pcszName) == 0)
662	{
663	found = true;
664	break;
665	}
666
667	rc = checkPermission(found ? (ePropFlags)it->mFlags : NILFLAG,
668	isGuest);
669	if (rc == VINF_SUCCESS)
670	{
671	/*
672	* Set the actual value
673	*/
674	if (found)
675	{
676	it->mValue = pcszValue;
677	it->mTimestamp = u64TimeNano;
678	it->mFlags = fFlags;
679	}
680	else /* This can throw. No problem as we have nothing to roll back. */
681	mProperties.push_back(Property(pcszName, pcszValue, u64TimeNano, fFlags));
682
683	/*
684	* Send a notification to the host and return.
685	*/
686	// if (isGuest) /* Notify the host even for properties that the host
687	// * changed. Less efficient, but ensures consistency. */
688	doNotifications(pcszName, u64TimeNano);
689	Log2(("Set string %s, rc=%Rrc, value=%s\n", pcszName, rc, pcszValue));
690	}
691	}
692
693	LogFlowThisFunc(("rc = %Rrc\n", rc));
694	return rc;
695	}
696
697
698	/**
699	* Remove a value in the property registry by name, checking the validity
700	* of the arguments passed.
701	*
702	* @returns iprt status value
703	* @param cParms the number of HGCM parameters supplied
704	* @param paParms the array of HGCM parameters
705	* @param isGuest is this call coming from the guest (or the host)?
706	* @thread HGCM
707	*/
708	int Service::delProperty(uint32_t cParms, VBOXHGCMSVCPARM paParms[], bool isGuest)
709	{
710	int rc = VINF_SUCCESS;
711	const char pcszName = NULL; / shut up gcc */
712	uint32_t cbName;
713
714	LogFlowThisFunc(("\n"));
715
716	/*
717	* Check the user-supplied parameters.
718	*/
719	if ( (cParms == 1) /* Hardcoded value as the next lines depend on it. */
720	&& RT_SUCCESS(paParms[0].getString(&pcszName, &cbName)) /* name */
721	)
722	rc = validateName(pcszName, cbName);
723	else
724	rc = VERR_INVALID_PARAMETER;
725	if (RT_SUCCESS(rc))
726	{
727	/*
728	* If the property exists, check its flags to see if we are allowed
729	* to change it.
730	*/
731	PropertyList::iterator it;
732	bool found = false;
733	for (it = mProperties.begin(); it != mProperties.end(); ++it)
734	if (it->mName.compare(pcszName) == 0)
735	{
736	found = true;
737	rc = checkPermission((ePropFlags)it->mFlags, isGuest);
738	break;
739	}
740
741	/*
742	* And delete the property if all is well.
743	*/
744	if (rc == VINF_SUCCESS && found)
745	{
746	uint64_t u64Timestamp = getCurrentTimestamp();
747	mProperties.erase(it);
748	// if (isGuest) /* Notify the host even for properties that the host
749	// * changed. Less efficient, but ensures consistency. */
750	doNotifications(pcszName, u64Timestamp);
751	}
752	}
753
754	LogFlowThisFunc(("rc = %Rrc\n", rc));
755	return rc;
756	}
757
758	/**
759	* Enumerate guest properties by mask, checking the validity
760	* of the arguments passed.
761	*
762	* @returns iprt status value
763	* @param cParms the number of HGCM parameters supplied
764	* @param paParms the array of HGCM parameters
765	* @thread HGCM
766	*/
767	int Service::enumProps(uint32_t cParms, VBOXHGCMSVCPARM paParms[])
768	{
769	int rc = VINF_SUCCESS;
770
771	/*
772	* Get the HGCM function arguments.
773	*/
774	char pcchPatterns = NULL, pchBuf = NULL;
775	uint32_t cchPatterns = 0, cchBuf = 0;
776	LogFlowThisFunc(("\n"));
777	if ( (cParms != 3) /* Hardcoded value as the next lines depend on it. */
778	\|\| RT_FAILURE(paParms[0].getString(&pcchPatterns, &cchPatterns)) /* patterns */
779	\|\| RT_FAILURE(paParms[1].getBuffer((void *) &pchBuf, &cchBuf)) / return buffer */
780	)
781	rc = VERR_INVALID_PARAMETER;
782	if (RT_SUCCESS(rc) && cchPatterns > MAX_PATTERN_LEN)
783	rc = VERR_TOO_MUCH_DATA;
784
785	/*
786	* First repack the patterns into the format expected by RTStrSimplePatternMatch()
787	*/
788	char pszPatterns[MAX_PATTERN_LEN];
789	if (RT_SUCCESS(rc))
790	{
791	for (unsigned i = 0; i < cchPatterns - 1; ++i)
792	if (pcchPatterns[i] != '\0')
793	pszPatterns[i] = pcchPatterns[i];
794	else
795	pszPatterns[i] = '\|';
796	pszPatterns[cchPatterns - 1] = '\0';
797	}
798
799	/*
800	* Next enumerate into a temporary buffer. This can throw, but this is
801	* not a problem as we have nothing to roll back.
802	*/
803	std::string buffer;
804	for (PropertyList::const_iterator it = mProperties.begin();
805	RT_SUCCESS(rc) && (it != mProperties.end()); ++it)
806	{
807	if (it->Matches(pszPatterns))
808	{
809	char szFlags[MAX_FLAGS_LEN];
810	char szTimestamp[256];
811	uint32_t cchTimestamp;
812	buffer += it->mName;
813	buffer += '\0';
814	buffer += it->mValue;
815	buffer += '\0';
816	cchTimestamp = RTStrFormatNumber(szTimestamp, it->mTimestamp,
817	10, 0, 0, 0);
818	buffer.append(szTimestamp, cchTimestamp);
819	buffer += '\0';
820	rc = writeFlags(it->mFlags, szFlags);
821	if (RT_SUCCESS(rc))
822	buffer += szFlags;
823	buffer += '\0';
824	}
825	}
826	if (RT_SUCCESS(rc))
827	buffer.append(4, '\0'); /* The final terminators */
828
829	/*
830	* Finally write out the temporary buffer to the real one if it is not too
831	* small.
832	*/
833	if (RT_SUCCESS(rc))
834	{
835	paParms[2].setUInt32 ((uint32_t)buffer.size());
836	/* Copy the memory if it fits into the guest buffer */
837	if (buffer.size() <= cchBuf)
838	buffer.copy(pchBuf, cchBuf);
839	else
840	rc = VERR_BUFFER_OVERFLOW;
841	}
842	return rc;
843	}
844
845
846	/** Helper query used by getOldNotification */
847	int Service::getOldNotificationInternal(const char *pszPatterns,
848	uint64_t u64Timestamp,
849	Property *pProp)
850	{
851	/* We count backwards, as the guest should normally be querying the
852	* most recent events. */
853	int rc = VWRN_NOT_FOUND;
854	PropertyList::reverse_iterator it = mGuestNotifications.rbegin();
855	for (; it != mGuestNotifications.rend(); ++it)
856	if (it->mTimestamp == u64Timestamp)
857	{
858	rc = VINF_SUCCESS;
859	break;
860	}
861
862	/* Now look for an event matching the patterns supplied. The base()
863	* member conveniently points to the following element. */
864	PropertyList::iterator base = it.base();
865	for (; base != mGuestNotifications.end(); ++base)
866	if (base->Matches(pszPatterns))
867	{
868	pProp = base;
869	return rc;
870	}
871	*pProp = Property();
872	return rc;
873	}
874
875
876	/** Helper query used by getNotification */
877	int Service::getNotificationWriteOut(VBOXHGCMSVCPARM paParms[], Property prop)
878	{
879	int rc = VINF_SUCCESS;
880	/* Format the data to write to the buffer. */
881	std::string buffer;
882	uint64_t u64Timestamp;
883	char *pchBuf;
884	uint32_t cchBuf;
885	rc = paParms[2].getBuffer((void **) &pchBuf, &cchBuf);
886	if (RT_SUCCESS(rc))
887	{
888	char szFlags[MAX_FLAGS_LEN];
889	rc = writeFlags(prop.mFlags, szFlags);
890	if (RT_SUCCESS(rc))
891	{
892	buffer += prop.mName;
893	buffer += '\0';
894	buffer += prop.mValue;
895	buffer += '\0';
896	buffer += szFlags;
897	buffer += '\0';
898	u64Timestamp = prop.mTimestamp;
899	}
900	}
901	/* Write out the data. */
902	if (RT_SUCCESS(rc))
903	{
904	paParms[1].setUInt64(u64Timestamp);
905	paParms[3].setUInt32((uint32_t)buffer.size());
906	if (buffer.size() <= cchBuf)
907	buffer.copy(pchBuf, cchBuf);
908	else
909	rc = VERR_BUFFER_OVERFLOW;
910	}
911	return rc;
912	}
913
914
915	/**
916	* Get the next guest notification.
917	*
918	* @returns iprt status value
919	* @param cParms the number of HGCM parameters supplied
920	* @param paParms the array of HGCM parameters
921	* @thread HGCM
922	* @throws can throw std::bad_alloc
923	*/
924	int Service::getNotification(VBOXHGCMCALLHANDLE callHandle, uint32_t cParms,
925	VBOXHGCMSVCPARM paParms[])
926	{
927	int rc = VINF_SUCCESS;
928	char pszPatterns = NULL; / shut up gcc */
929	char *pchBuf;
930	uint32_t cchPatterns = 0;
931	uint32_t cchBuf = 0;
932	uint64_t u64Timestamp;
933
934	/*
935	* Get the HGCM function arguments and perform basic verification.
936	*/
937	LogFlowThisFunc(("\n"));
938	if ( (cParms != 4) /* Hardcoded value as the next lines depend on it. */
939	\|\| RT_FAILURE(paParms[0].getString(&pszPatterns, &cchPatterns)) /* patterns */
940	\|\| RT_FAILURE(paParms[1].getUInt64(&u64Timestamp)) /* timestamp */
941	\|\| RT_FAILURE(paParms[2].getBuffer((void *) &pchBuf, &cchBuf)) / return buffer */
942	)
943	rc = VERR_INVALID_PARAMETER;
944	if (RT_SUCCESS(rc))
945	LogFlow((" pszPatterns=%s, u64Timestamp=%llu\n", pszPatterns,
946	u64Timestamp));
947
948	/*
949	* If no timestamp was supplied or no notification was found in the queue
950	* of old notifications, enqueue the request in the waiting queue.
951	*/
952	Property prop;
953	if (RT_SUCCESS(rc) && u64Timestamp != 0)
954	rc = getOldNotification(pszPatterns, u64Timestamp, &prop);
955	if (RT_SUCCESS(rc) && prop.isNull())
956	{
957	mGuestWaiters.push_back(GuestCall(callHandle, GET_NOTIFICATION,
958	paParms, rc));
959	rc = VINF_HGCM_ASYNC_EXECUTE;
960	}
961	/*
962	* Otherwise reply at once with the enqueued notification we found.
963	*/
964	else
965	{
966	int rc2 = getNotificationWriteOut(paParms, prop);
967	if (RT_FAILURE(rc2))
968	rc = rc2;
969	}
970	return rc;
971	}
972
973
974	/**
975	* Notify the service owner and the guest that a property has been
976	* added/deleted/changed
977	* @param pszProperty the name of the property which has changed
978	* @param u64Timestamp the time at which the change took place
979	*
980	* @thread HGCM service
981	*/
982	void Service::doNotifications(const char *pszProperty, uint64_t u64Timestamp)
983	{
984	int rc = VINF_SUCCESS;
985
986	AssertPtrReturnVoid(pszProperty);
987	LogFlowThisFunc (("pszProperty=%s, u64Timestamp=%llu\n", pszProperty, u64Timestamp));
988	/* Ensure that our timestamp is different to the last one. */
989	if ( !mGuestNotifications.empty()
990	&& u64Timestamp == mGuestNotifications.back().mTimestamp)
991	++u64Timestamp;
992
993	/*
994	* Try to find the property. Create a change event if we find it and a
995	* delete event if we do not.
996	*/
997	Property prop;
998	prop.mName = pszProperty;
999	prop.mTimestamp = u64Timestamp;
1000	/* prop is currently a delete event for pszProperty */
1001	bool found = false;
1002	if (RT_SUCCESS(rc))
1003	for (PropertyList::const_iterator it = mProperties.begin();
1004	!found && it != mProperties.end(); ++it)
1005	if (it->mName.compare(pszProperty) == 0)
1006	{
1007	found = true;
1008	/* Make prop into a change event. */
1009	prop.mValue = it->mValue;
1010	prop.mFlags = it->mFlags;
1011	}
1012
1013
1014	/* Release waiters if applicable and add the event to the queue for
1015	* guest notifications */
1016	if (RT_SUCCESS(rc))
1017	{
1018	try
1019	{
1020	CallList::iterator it = mGuestWaiters.begin();
1021	while (it != mGuestWaiters.end())
1022	{
1023	const char *pszPatterns;
1024	uint32_t cchPatterns;
1025	it->mParms[0].getString(&pszPatterns, &cchPatterns);
1026	if (prop.Matches(pszPatterns))
1027	{
1028	GuestCall curCall = *it;
1029	int rc2 = getNotificationWriteOut(curCall.mParms, prop);
1030	if (RT_SUCCESS(rc2))
1031	rc2 = curCall.mRc;
1032	mpHelpers->pfnCallComplete(curCall.mHandle, rc2);
1033	it = mGuestWaiters.erase(it);
1034	}
1035	else
1036	++it;
1037	}
1038	mGuestNotifications.push_back(prop);
1039	}
1040	catch (std::bad_alloc)
1041	{
1042	rc = VERR_NO_MEMORY;
1043	}
1044	}
1045	if (mGuestNotifications.size() > MAX_GUEST_NOTIFICATIONS)
1046	mGuestNotifications.pop_front();
1047
1048	/*
1049	* Host notifications - first case: if the property exists then send its
1050	* current value
1051	*/
1052	if (found && mpfnHostCallback != NULL)
1053	{
1054	char szFlags[MAX_FLAGS_LEN];
1055	/* Send out a host notification */
1056	const char *pszValue = prop.mValue.c_str();
1057	if (RT_SUCCESS(rc))
1058	rc = writeFlags(prop.mFlags, szFlags);
1059	if (RT_SUCCESS(rc))
1060	rc = notifyHost(pszProperty, pszValue, u64Timestamp, szFlags);
1061	}
1062
1063	/*
1064	* Host notifications - second case: if the property does not exist then
1065	* send the host an empty value
1066	*/
1067	if (!found && mpfnHostCallback != NULL)
1068	{
1069	/* Send out a host notification */
1070	if (RT_SUCCESS(rc))
1071	rc = notifyHost(pszProperty, NULL, u64Timestamp, NULL);
1072	}
1073	LogFlowThisFunc (("returning\n"));
1074	}
1075
1076	/**
1077	* Notify the service owner that a property has been added/deleted/changed.
1078	* @returns IPRT status value
1079	* @param pszName the property name
1080	* @param pszValue the new value, or NULL if the property was deleted
1081	* @param u64Timestamp the time of the change
1082	* @param pszFlags the new flags string
1083	*/
1084	int Service::notifyHost(const char pszName, const char pszValue,
1085	uint64_t u64Timestamp, const char *pszFlags)
1086	{
1087	LogFlowFunc (("pszName=%s, pszValue=%s, u64Timestamp=%llu, pszFlags=%s\n",
1088	pszName, pszValue, u64Timestamp, pszFlags));
1089	HOSTCALLBACKDATA HostCallbackData;
1090	HostCallbackData.u32Magic = HOSTCALLBACKMAGIC;
1091	HostCallbackData.pcszName = pszName;
1092	HostCallbackData.pcszValue = pszValue;
1093	HostCallbackData.u64Timestamp = u64Timestamp;
1094	HostCallbackData.pcszFlags = pszFlags;
1095	int rc = mpfnHostCallback (mpvHostData, 0 /u32Function/,
1096	(void *)(&HostCallbackData),
1097	sizeof(HostCallbackData));
1098	LogFlowFunc (("returning %Rrc\n", rc));
1099	return rc;
1100	}
1101
1102
1103	/**
1104	* Handle an HGCM service call.
1105	* @copydoc VBOXHGCMSVCFNTABLE::pfnCall
1106	* @note All functions which do not involve an unreasonable delay will be
1107	* handled synchronously. If needed, we will add a request handler
1108	* thread in future for those which do.
1109	*
1110	* @thread HGCM
1111	*/
1112	void Service::call (VBOXHGCMCALLHANDLE callHandle, uint32_t u32ClientID,
1113	void * /* pvClient */, uint32_t eFunction, uint32_t cParms,
1114	VBOXHGCMSVCPARM paParms[])
1115	{
1116	int rc = VINF_SUCCESS;
1117	LogFlowFunc(("u32ClientID = %d, fn = %d, cParms = %d, pparms = %d\n",
1118	u32ClientID, eFunction, cParms, paParms));
1119
1120	try
1121	{
1122	switch (eFunction)
1123	{
1124	/* The guest wishes to read a property */
1125	case GET_PROP:
1126	LogFlowFunc(("GET_PROP\n"));
1127	rc = getProperty(cParms, paParms);
1128	break;
1129
1130	/* The guest wishes to set a property */
1131	case SET_PROP:
1132	LogFlowFunc(("SET_PROP\n"));
1133	rc = setProperty(cParms, paParms, true);
1134	break;
1135
1136	/* The guest wishes to set a property value */
1137	case SET_PROP_VALUE:
1138	LogFlowFunc(("SET_PROP_VALUE\n"));
1139	rc = setProperty(cParms, paParms, true);
1140	break;
1141
1142	/* The guest wishes to remove a configuration value */
1143	case DEL_PROP:
1144	LogFlowFunc(("DEL_PROP\n"));
1145	rc = delProperty(cParms, paParms, true);
1146	break;
1147
1148	/* The guest wishes to enumerate all properties */
1149	case ENUM_PROPS:
1150	LogFlowFunc(("ENUM_PROPS\n"));
1151	rc = enumProps(cParms, paParms);
1152	break;
1153
1154	/* The guest wishes to get the next property notification */
1155	case GET_NOTIFICATION:
1156	LogFlowFunc(("GET_NOTIFICATION\n"));
1157	rc = getNotification(callHandle, cParms, paParms);
1158	break;
1159
1160	default:
1161	rc = VERR_NOT_IMPLEMENTED;
1162	}
1163	}
1164	catch (std::bad_alloc)
1165	{
1166	rc = VERR_NO_MEMORY;
1167	}
1168	LogFlowFunc(("rc = %Rrc\n", rc));
1169	if (rc != VINF_HGCM_ASYNC_EXECUTE)
1170	{
1171	mpHelpers->pfnCallComplete (callHandle, rc);
1172	}
1173	}
1174
1175
1176	/**
1177	* Service call handler for the host.
1178	* @copydoc VBOXHGCMSVCFNTABLE::pfnHostCall
1179	* @thread hgcm
1180	*/
1181	int Service::hostCall (uint32_t eFunction, uint32_t cParms, VBOXHGCMSVCPARM paParms[])
1182	{
1183	int rc = VINF_SUCCESS;
1184
1185	LogFlowFunc(("fn = %d, cParms = %d, pparms = %d\n",
1186	eFunction, cParms, paParms));
1187
1188	try
1189	{
1190	switch (eFunction)
1191	{
1192	/* The host wishes to set a block of properties */
1193	case SET_PROPS_HOST:
1194	LogFlowFunc(("SET_PROPS_HOST\n"));
1195	rc = setPropertyBlock(cParms, paParms);
1196	break;
1197
1198	/* The host wishes to read a configuration value */
1199	case GET_PROP_HOST:
1200	LogFlowFunc(("GET_PROP_HOST\n"));
1201	rc = getProperty(cParms, paParms);
1202	break;
1203
1204	/* The host wishes to set a configuration value */
1205	case SET_PROP_HOST:
1206	LogFlowFunc(("SET_PROP_HOST\n"));
1207	rc = setProperty(cParms, paParms, false);
1208	break;
1209
1210	/* The host wishes to set a configuration value */
1211	case SET_PROP_VALUE_HOST:
1212	LogFlowFunc(("SET_PROP_VALUE_HOST\n"));
1213	rc = setProperty(cParms, paParms, false);
1214	break;
1215
1216	/* The host wishes to remove a configuration value */
1217	case DEL_PROP_HOST:
1218	LogFlowFunc(("DEL_PROP_HOST\n"));
1219	rc = delProperty(cParms, paParms, false);
1220	break;
1221
1222	/* The host wishes to enumerate all properties */
1223	case ENUM_PROPS_HOST:
1224	LogFlowFunc(("ENUM_PROPS\n"));
1225	rc = enumProps(cParms, paParms);
1226	break;
1227
1228	/* The host wishes to set global flags for the service */
1229	case SET_GLOBAL_FLAGS_HOST:
1230	LogFlowFunc(("SET_GLOBAL_FLAGS_HOST\n"));
1231	if (cParms == 1)
1232	{
1233	uint32_t eFlags;
1234	rc = paParms[0].getUInt32(&eFlags);
1235	if (RT_SUCCESS(rc))
1236	meGlobalFlags = (ePropFlags)eFlags;
1237	}
1238	else
1239	rc = VERR_INVALID_PARAMETER;
1240	break;
1241
1242	default:
1243	rc = VERR_NOT_SUPPORTED;
1244	break;
1245	}
1246	}
1247	catch (std::bad_alloc)
1248	{
1249	rc = VERR_NO_MEMORY;
1250	}
1251
1252	LogFlowFunc(("rc = %Rrc\n", rc));
1253	return rc;
1254	}
1255
1256	int Service::uninit()
1257	{
1258	return VINF_SUCCESS;
1259	}
1260
1261	} /* namespace guestProp */
1262
1263	using guestProp::Service;
1264
1265	/**
1266	* @copydoc VBOXHGCMSVCLOAD
1267	*/
1268	extern "C" DECLCALLBACK(DECLEXPORT(int)) VBoxHGCMSvcLoad (VBOXHGCMSVCFNTABLE *ptable)
1269	{
1270	int rc = VINF_SUCCESS;
1271
1272	LogFlowFunc(("ptable = %p\n", ptable));
1273
1274	if (!VALID_PTR(ptable))
1275	{
1276	rc = VERR_INVALID_PARAMETER;
1277	}
1278	else
1279	{
1280	LogFlowFunc(("ptable->cbSize = %d, ptable->u32Version = 0x%08X\n", ptable->cbSize, ptable->u32Version));
1281
1282	if ( ptable->cbSize != sizeof (VBOXHGCMSVCFNTABLE)
1283	\|\| ptable->u32Version != VBOX_HGCM_SVC_VERSION)
1284	{
1285	rc = VERR_VERSION_MISMATCH;
1286	}
1287	else
1288	{
1289	std::auto_ptr<Service> apService;
1290	/* No exceptions may propagate outside. */
1291	try {
1292	apService = std::auto_ptr<Service>(new Service(ptable->pHelpers));
1293	} catch (int rcThrown) {
1294	rc = rcThrown;
1295	} catch (...) {
1296	rc = VERR_UNRESOLVED_ERROR;
1297	}
1298
1299	if (RT_SUCCESS(rc))
1300	{
1301	/* We do not maintain connections, so no client data is needed. */
1302	ptable->cbClient = 0;
1303
1304	ptable->pfnUnload = Service::svcUnload;
1305	ptable->pfnConnect = Service::svcConnectDisconnect;
1306	ptable->pfnDisconnect = Service::svcConnectDisconnect;
1307	ptable->pfnCall = Service::svcCall;
1308	ptable->pfnHostCall = Service::svcHostCall;
1309	ptable->pfnSaveState = NULL; /* The service is stateless, so the normal */
1310	ptable->pfnLoadState = NULL; /* construction done before restoring suffices */
1311	ptable->pfnRegisterExtension = Service::svcRegisterExtension;
1312
1313	/* Service specific initialization. */
1314	ptable->pvService = apService.release();
1315	}
1316	}
1317	}
1318
1319	LogFlowFunc(("returning %Rrc\n", rc));
1320	return rc;
1321	}
1322

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source: vbox/trunk/src/VBox/HostServices/GuestProperties/service.cpp@ 34562

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