USBProxyBackend.cpp@ 100841

Last change on this file since 100841 was 99739, checked in by vboxsync, 20 months ago
*: doxygen corrections (mostly about removing @returns from functions returning void).
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1	/* $Id: USBProxyBackend.cpp 99739 2023-05-11 01:01:08Z vboxsync $ */
2	/** @file
3	* VirtualBox USB Proxy Service (base) class.
4	*/
5
6	/*
7	* Copyright (C) 2006-2023 Oracle and/or its affiliates.
8	*
9	* This file is part of VirtualBox base platform packages, as
10	* available from https://www.virtualbox.org.
11	*
12	* This program is free software; you can redistribute it and/or
13	* modify it under the terms of the GNU General Public License
14	* as published by the Free Software Foundation, in version 3 of the
15	* License.
16	*
17	* This program is distributed in the hope that it will be useful, but
18	* WITHOUT ANY WARRANTY; without even the implied warranty of
19	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
20	* General Public License for more details.
21	*
22	* You should have received a copy of the GNU General Public License
23	* along with this program; if not, see <https://www.gnu.org/licenses>.
24	*
25	* SPDX-License-Identifier: GPL-3.0-only
26	*/
27
28	#define LOG_GROUP LOG_GROUP_MAIN_USBPROXYBACKEND
29	#include "USBProxyBackend.h"
30	#include "USBProxyService.h"
31	#include "HostUSBDeviceImpl.h"
32	#include "HostImpl.h"
33	#include "MachineImpl.h"
34	#include "VirtualBoxImpl.h"
35
36	#include "AutoCaller.h"
37	#include "LoggingNew.h"
38
39	#include <VBox/com/array.h>
40	#include <iprt/errcore.h>
41	#include <iprt/asm.h>
42	#include <iprt/semaphore.h>
43	#include <iprt/thread.h>
44	#include <iprt/mem.h>
45	#include <iprt/string.h>
46
47
48	/**
49	* Empty constructor.
50	*/
51	USBProxyBackend::USBProxyBackend()
52	{
53	LogFlowThisFunc(("\n"));
54	}
55
56
57	/**
58	* Empty destructor.
59	*/
60	USBProxyBackend::~USBProxyBackend()
61	{
62	}
63
64
65	HRESULT USBProxyBackend::FinalConstruct()
66	{
67	return BaseFinalConstruct();
68	}
69
70	void USBProxyBackend::FinalRelease()
71	{
72	uninit();
73	BaseFinalRelease();
74	}
75
76	/**
77	* Stub needed as long as the class isn't virtual
78	*/
79	int USBProxyBackend::init(USBProxyService *pUsbProxyService, const com::Utf8Str &strId,
80	const com::Utf8Str &strAddress, bool fLoadingSettings)
81	{
82	RT_NOREF1(fLoadingSettings);
83
84	m_pUsbProxyService = pUsbProxyService;
85	mThread = NIL_RTTHREAD;
86	mTerminate = false;
87	unconst(m_strId) = strId;
88	m_cRefs = 0;
89	unconst(m_strAddress) = strAddress;
90
91	unconst(m_strBackend) = Utf8Str::Empty;
92
93	return VINF_SUCCESS;
94	}
95
96
97	void USBProxyBackend::uninit()
98	{
99	LogFlowThisFunc(("\n"));
100	Assert(mThread == NIL_RTTHREAD);
101	mTerminate = true;
102	m_pUsbProxyService = NULL;
103	m_llDevices.clear();
104	}
105
106	/**
107	* Query if the service is active and working.
108	*
109	* @returns true if the service is up running.
110	* @returns false if the service isn't running.
111	*/
112	bool USBProxyBackend::isActive(void)
113	{
114	return mThread != NIL_RTTHREAD;
115	}
116
117
118	/**
119	* Returns the ID of the instance.
120	*
121	* @returns ID string for the instance.
122	*/
123	const com::Utf8Str &USBProxyBackend::i_getId()
124	{
125	return m_strId;
126	}
127
128
129	/**
130	* Returns the address of the instance.
131	*
132	* @returns ID string for the instance.
133	*/
134	const com::Utf8Str &USBProxyBackend::i_getAddress()
135	{
136	return m_strAddress;
137	}
138
139
140	/**
141	* Returns the backend of the instance.
142	*
143	* @returns ID string for the instance.
144	*/
145	const com::Utf8Str &USBProxyBackend::i_getBackend()
146	{
147	return m_strBackend;
148	}
149
150	/**
151	* Returns the current reference counter for the backend.
152	*/
153	uint32_t USBProxyBackend::i_getRefCount()
154	{
155	AutoReadLock alock(this COMMA_LOCKVAL_SRC_POS);
156	return m_cRefs;
157	}
158
159
160	/**
161	* A filter was inserted / loaded.
162	*
163	* @param aFilter Pointer to the inserted filter.
164	* @return ID of the inserted filter
165	*/
166	void *USBProxyBackend::insertFilter(PCUSBFILTER aFilter)
167	{
168	// return non-NULL to fake success.
169	NOREF(aFilter);
170	return (void *)1;
171	}
172
173
174	/**
175	* A filter was removed.
176	*
177	* @param aId ID of the filter to remove
178	*/
179	void USBProxyBackend::removeFilter(void *aId)
180	{
181	NOREF(aId);
182	}
183
184
185	/**
186	* A VM is trying to capture a device, do necessary preparations.
187	*
188	* @returns VBox status code.
189	* @param aDevice The device in question.
190	*/
191	int USBProxyBackend::captureDevice(HostUSBDevice *aDevice)
192	{
193	NOREF(aDevice);
194	return VERR_NOT_IMPLEMENTED;
195	}
196
197
198	/**
199	* Notification that an async captureDevice() operation completed.
200	*
201	* This is used by the proxy to release temporary filters.
202	*
203	* @param aDevice The device in question.
204	* @param aSuccess Whether it succeeded or failed.
205	*/
206	void USBProxyBackend::captureDeviceCompleted(HostUSBDevice *aDevice, bool aSuccess)
207	{
208	NOREF(aDevice);
209	NOREF(aSuccess);
210
211	AutoWriteLock alock(this COMMA_LOCKVAL_SRC_POS);
212	incRef();
213	}
214
215
216	/**
217	* A VM is releasing a device back to the host.
218	*
219	* @returns VBox status code.
220	* @param aDevice The device in question.
221	*/
222	int USBProxyBackend::releaseDevice(HostUSBDevice *aDevice)
223	{
224	NOREF(aDevice);
225	return VERR_NOT_IMPLEMENTED;
226	}
227
228
229	/**
230	* Notification that an async releaseDevice() operation completed.
231	*
232	* This is used by the proxy to release temporary filters.
233	*
234	* @param aDevice The device in question.
235	* @param aSuccess Whether it succeeded or failed.
236	*/
237	void USBProxyBackend::releaseDeviceCompleted(HostUSBDevice *aDevice, bool aSuccess)
238	{
239	NOREF(aDevice);
240	NOREF(aSuccess);
241
242	AutoWriteLock alock(this COMMA_LOCKVAL_SRC_POS);
243	decRef();
244	}
245
246
247	bool USBProxyBackend::isFakeUpdateRequired()
248	{
249	return false;
250	}
251
252	/**
253	* Returns whether devices reported by this backend go through a de/re-attach
254	* and device re-enumeration cycle when they are captured or released.
255	*/
256	bool USBProxyBackend::i_isDevReEnumerationRequired()
257	{
258	return false;
259	}
260
261	// Internals
262	/////////////////////////////////////////////////////////////////////////////
263
264
265	/**
266	* Starts the service.
267	*
268	* @returns VBox status code.
269	*/
270	int USBProxyBackend::start(void)
271	{
272	int vrc = VINF_SUCCESS;
273	if (mThread == NIL_RTTHREAD)
274	{
275	/*
276	* Force update before starting the poller thread.
277	*/
278	vrc = wait(0);
279	if (vrc == VERR_TIMEOUT \|\| vrc == VERR_INTERRUPTED \|\| RT_SUCCESS(vrc))
280	{
281	PUSBDEVICE pDevices = getDevices();
282	updateDeviceList(pDevices);
283
284	/*
285	* Create the poller thread which will look for changes.
286	*/
287	mTerminate = false;
288	vrc = RTThreadCreate(&mThread, USBProxyBackend::serviceThread, this,
289	0, RTTHREADTYPE_INFREQUENT_POLLER, RTTHREADFLAGS_WAITABLE, "USBPROXY");
290	AssertRC(vrc);
291	if (RT_SUCCESS(vrc))
292	LogFlowThisFunc(("started mThread=%RTthrd\n", mThread));
293	else
294	mThread = NIL_RTTHREAD;
295	}
296	}
297	else
298	LogFlowThisFunc(("already running, mThread=%RTthrd\n", mThread));
299	return vrc;
300	}
301
302
303	/**
304	* Stops the service.
305	*
306	* @returns VBox status code.
307	*/
308	int USBProxyBackend::stop(void)
309	{
310	int vrc = VINF_SUCCESS;
311	if (mThread != NIL_RTTHREAD)
312	{
313	/*
314	* Mark the thread for termination and kick it.
315	*/
316	ASMAtomicXchgSize(&mTerminate, true);
317	vrc = interruptWait();
318	AssertRC(vrc);
319
320	/*
321	* Wait for the thread to finish and then update the state.
322	*/
323	vrc = RTThreadWait(mThread, 60000, NULL);
324	if (vrc == VERR_INVALID_HANDLE)
325	vrc = VINF_SUCCESS;
326	if (RT_SUCCESS(vrc))
327	{
328	LogFlowThisFunc(("stopped mThread=%RTthrd\n", mThread));
329	mThread = NIL_RTTHREAD;
330	mTerminate = false;
331	}
332	else
333	AssertRC(vrc);
334	}
335	else
336	LogFlowThisFunc(("not active\n"));
337
338	/* Make sure there is no device from us in the list anymore. */
339	updateDeviceList(NULL);
340
341	return vrc;
342	}
343
344
345	/**
346	* The service thread created by start().
347	*
348	* @param Thread The thread handle.
349	* @param pvUser Pointer to the USBProxyBackend instance.
350	*/
351	/static/ DECLCALLBACK(int) USBProxyBackend::serviceThread(RTTHREAD /* Thread /, void pvUser)
352	{
353	USBProxyBackend pThis = (USBProxyBackend )pvUser;
354	LogFlowFunc(("pThis=%p\n", pThis));
355	pThis->serviceThreadInit();
356	int vrc = VINF_SUCCESS;
357
358	/*
359	* Processing loop.
360	*/
361	for (;;)
362	{
363	vrc = pThis->wait(RT_INDEFINITE_WAIT);
364	if (RT_FAILURE(vrc) && vrc != VERR_INTERRUPTED && vrc != VERR_TIMEOUT)
365	break;
366	if (pThis->mTerminate)
367	break;
368
369	PUSBDEVICE pDevices = pThis->getDevices();
370	pThis->updateDeviceList(pDevices);
371	}
372
373	pThis->serviceThreadTerm();
374	LogFlowFunc(("returns %Rrc\n", vrc));
375	return vrc;
376	}
377
378
379	/**
380	* First call made on the service thread, use it to do
381	* thread initialization.
382	*
383	* The default implementation in USBProxyBackend just a dummy stub.
384	*/
385	void USBProxyBackend::serviceThreadInit(void)
386	{
387	}
388
389
390	/**
391	* Last call made on the service thread, use it to do
392	* thread termination.
393	*/
394	void USBProxyBackend::serviceThreadTerm(void)
395	{
396	}
397
398
399	/**
400	* Wait for a change in the USB devices attached to the host.
401	*
402	* The default implementation in USBProxyBackend just a dummy stub.
403	*
404	* @returns VBox status code. VERR_INTERRUPTED and VERR_TIMEOUT are considered
405	* harmless, while all other error status are fatal.
406	* @param aMillies Number of milliseconds to wait.
407	*/
408	int USBProxyBackend::wait(RTMSINTERVAL aMillies)
409	{
410	return RTThreadSleep(RT_MIN(aMillies, 250));
411	}
412
413
414	/**
415	* Interrupt any wait() call in progress.
416	*
417	* The default implementation in USBProxyBackend just a dummy stub.
418	*
419	* @returns VBox status code.
420	*/
421	int USBProxyBackend::interruptWait(void)
422	{
423	return VERR_NOT_IMPLEMENTED;
424	}
425
426
427	/**
428	* Get a list of USB device currently attached to the host.
429	*
430	* The default implementation in USBProxyBackend just a dummy stub.
431	*
432	* @returns Pointer to a list of USB devices.
433	* The list nodes are freed individually by calling freeDevice().
434	*/
435	PUSBDEVICE USBProxyBackend::getDevices(void)
436	{
437	return NULL;
438	}
439
440
441	/**
442	* Increments the reference counter.
443	*
444	* @returns New reference count value.
445	*/
446	uint32_t USBProxyBackend::incRef()
447	{
448	Assert(isWriteLockOnCurrentThread());
449
450	return ++m_cRefs;
451	}
452
453	/**
454	* Decrements the reference counter.
455	*
456	* @returns New reference count value.
457	*/
458	uint32_t USBProxyBackend::decRef()
459	{
460	Assert(isWriteLockOnCurrentThread());
461
462	return --m_cRefs;
463	}
464
465
466	/**
467	* Free all the members of a USB device returned by getDevice().
468	*
469	* @param pDevice Pointer to the device.
470	*/
471	/static/ void
472	USBProxyBackend::freeDeviceMembers(PUSBDEVICE pDevice)
473	{
474	RTStrFree((char *)pDevice->pszManufacturer);
475	pDevice->pszManufacturer = NULL;
476	RTStrFree((char *)pDevice->pszProduct);
477	pDevice->pszProduct = NULL;
478	RTStrFree((char *)pDevice->pszSerialNumber);
479	pDevice->pszSerialNumber = NULL;
480
481	RTStrFree((char *)pDevice->pszAddress);
482	pDevice->pszAddress = NULL;
483	RTStrFree((char *)pDevice->pszBackend);
484	pDevice->pszBackend = NULL;
485	#ifdef RT_OS_WINDOWS
486	RTStrFree(pDevice->pszAltAddress);
487	pDevice->pszAltAddress = NULL;
488	RTStrFree(pDevice->pszHubName);
489	pDevice->pszHubName = NULL;
490	#elif defined(RT_OS_SOLARIS)
491	RTStrFree(pDevice->pszDevicePath);
492	pDevice->pszDevicePath = NULL;
493	#endif
494	}
495
496
497	/**
498	* Free one USB device returned by getDevice().
499	*
500	* @param pDevice Pointer to the device.
501	*/
502	/static/ void
503	USBProxyBackend::freeDevice(PUSBDEVICE pDevice)
504	{
505	freeDeviceMembers(pDevice);
506	RTMemFree(pDevice);
507	}
508
509	void USBProxyBackend::deviceAdded(ComObjPtr<HostUSBDevice> &aDevice, PUSBDEVICE pDev)
510	{
511	/* Nothing to do. */
512	NOREF(aDevice);
513	NOREF(pDev);
514	}
515
516	/**
517	* Initializes a filter with the data from the specified device.
518	*
519	* @param aFilter The filter to fill.
520	* @param aDevice The device to fill it with.
521	*/
522	/static/ void
523	USBProxyBackend::initFilterFromDevice(PUSBFILTER aFilter, HostUSBDevice *aDevice)
524	{
525	PCUSBDEVICE pDev = aDevice->i_getUsbData();
526	int vrc;
527
528	vrc = USBFilterSetNumExact(aFilter, USBFILTERIDX_VENDOR_ID, pDev->idVendor, true); AssertRC(vrc);
529	vrc = USBFilterSetNumExact(aFilter, USBFILTERIDX_PRODUCT_ID, pDev->idProduct, true); AssertRC(vrc);
530	vrc = USBFilterSetNumExact(aFilter, USBFILTERIDX_DEVICE_REV, pDev->bcdDevice, true); AssertRC(vrc);
531	vrc = USBFilterSetNumExact(aFilter, USBFILTERIDX_DEVICE_CLASS, pDev->bDeviceClass, true); AssertRC(vrc);
532	vrc = USBFilterSetNumExact(aFilter, USBFILTERIDX_DEVICE_SUB_CLASS, pDev->bDeviceSubClass, true); AssertRC(vrc);
533	vrc = USBFilterSetNumExact(aFilter, USBFILTERIDX_DEVICE_PROTOCOL, pDev->bDeviceProtocol, true); AssertRC(vrc);
534	vrc = USBFilterSetNumExact(aFilter, USBFILTERIDX_PORT, pDev->bPort, false); AssertRC(vrc);
535	vrc = USBFilterSetNumExact(aFilter, USBFILTERIDX_BUS, pDev->bBus, false); AssertRC(vrc);
536	if (pDev->pszSerialNumber)
537	{
538	vrc = USBFilterSetStringExact(aFilter, USBFILTERIDX_SERIAL_NUMBER_STR, pDev->pszSerialNumber,
539	true /fMustBePresent/, true /fPurge/);
540	AssertRC(vrc);
541	}
542	if (pDev->pszProduct)
543	{
544	vrc = USBFilterSetStringExact(aFilter, USBFILTERIDX_PRODUCT_STR, pDev->pszProduct,
545	true /fMustBePresent/, true /fPurge/);
546	AssertRC(vrc);
547	}
548	if (pDev->pszManufacturer)
549	{
550	vrc = USBFilterSetStringExact(aFilter, USBFILTERIDX_MANUFACTURER_STR, pDev->pszManufacturer,
551	true /fMustBePresent/, true /fPurge/);
552	AssertRC(vrc);
553	}
554	}
555
556	HRESULT USBProxyBackend::getName(com::Utf8Str &aName)
557	{
558	/* strId is constant during life time, no need to lock */
559	aName = m_strId;
560	return S_OK;
561	}
562
563	HRESULT USBProxyBackend::getType(com::Utf8Str &aType)
564	{
565	aType = Utf8Str::Empty;
566	return S_OK;
567	}
568
569	/**
570	* Sort a list of USB devices.
571	*
572	* @returns Pointer to the head of the sorted doubly linked list.
573	* @param pDevices Head pointer (can be both singly and doubly linked list).
574	*/
575	static PUSBDEVICE sortDevices(PUSBDEVICE pDevices)
576	{
577	PUSBDEVICE pHead = NULL;
578	PUSBDEVICE pTail = NULL;
579	while (pDevices)
580	{
581	/* unlink head */
582	PUSBDEVICE pDev = pDevices;
583	pDevices = pDev->pNext;
584	if (pDevices)
585	pDevices->pPrev = NULL;
586
587	/* find location. */
588	PUSBDEVICE pCur = pTail;
589	while ( pCur
590	&& HostUSBDevice::i_compare(pCur, pDev) > 0)
591	pCur = pCur->pPrev;
592
593	/* insert (after pCur) */
594	pDev->pPrev = pCur;
595	if (pCur)
596	{
597	pDev->pNext = pCur->pNext;
598	pCur->pNext = pDev;
599	if (pDev->pNext)
600	pDev->pNext->pPrev = pDev;
601	else
602	pTail = pDev;
603	}
604	else
605	{
606	pDev->pNext = pHead;
607	if (pHead)
608	pHead->pPrev = pDev;
609	else
610	pTail = pDev;
611	pHead = pDev;
612	}
613	}
614
615	LogFlowFuncLeave();
616	return pHead;
617	}
618
619
620	/**
621	* Process any relevant changes in the attached USB devices.
622	*
623	* This is called from any available USB proxy backends service thread when they discover
624	* a change.
625	*/
626	void USBProxyBackend::updateDeviceList(PUSBDEVICE pDevices)
627	{
628	LogFlowThisFunc(("\n"));
629
630	pDevices = sortDevices(pDevices);
631
632	AutoWriteLock alock(this COMMA_LOCKVAL_SRC_POS);
633
634	/*
635	* Compare previous list with the new list of devices
636	* and merge in any changes while notifying Host.
637	*/
638	HostUSBDeviceList::iterator it = this->m_llDevices.begin();
639	while ( it != m_llDevices.end()
640	\|\| pDevices)
641	{
642	ComObjPtr<HostUSBDevice> pHostDevice;
643
644	if (it != m_llDevices.end())
645	pHostDevice = *it;
646
647	/*
648	* Assert that the object is still alive (we still reference it in
649	* the collection and we're the only one who calls uninit() on it.
650	*/
651	AutoCaller devCaller(pHostDevice.isNull() ? NULL : pHostDevice);
652	AssertComRC(devCaller.hrc());
653
654	/*
655	* Lock the device object since we will read/write its
656	* properties. All Host callbacks also imply the object is locked.
657	*/
658	AutoWriteLock devLock(pHostDevice.isNull() ? NULL : pHostDevice
659	COMMA_LOCKVAL_SRC_POS);
660
661	/* We should never get devices from other backends here. */
662	Assert(pHostDevice.isNull() \|\| pHostDevice->i_getUsbProxyBackend() == this);
663
664	/*
665	* Compare.
666	*/
667	int iDiff;
668	if (pHostDevice.isNull())
669	iDiff = 1;
670	else
671	{
672	if (!pDevices)
673	iDiff = -1;
674	else
675	iDiff = pHostDevice->i_compare(pDevices);
676	}
677	if (!iDiff)
678	{
679	/*
680	* The device still there, update the state and move on. The PUSBDEVICE
681	* structure is eaten by updateDeviceState / HostUSBDevice::updateState().
682	*/
683	PUSBDEVICE pCur = pDevices;
684	pDevices = pDevices->pNext;
685	pCur->pPrev = pCur->pNext = NULL;
686
687	devLock.release();
688	alock.release();
689	m_pUsbProxyService->i_updateDeviceState(pHostDevice, pCur, isFakeUpdateRequired());
690	alock.acquire();
691	++it;
692	}
693	else
694	{
695	if (iDiff > 0)
696	{
697	/*
698	* Head of pDevices was attached.
699	*/
700	PUSBDEVICE pNew = pDevices;
701	pDevices = pDevices->pNext;
702	pNew->pPrev = pNew->pNext = NULL;
703
704	ComObjPtr<HostUSBDevice> NewObj;
705	NewObj.createObject();
706	NewObj->init(pNew, this);
707	LogFlowThisFunc(("attached %p {%s} %s / %p:{.idVendor=%#06x, .idProduct=%#06x, .pszProduct=\"%s\", .pszManufacturer=\"%s\"}\n",
708	(HostUSBDevice *)NewObj,
709	NewObj->i_getName().c_str(),
710	NewObj->i_getStateName(),
711	pNew,
712	pNew->idVendor,
713	pNew->idProduct,
714	pNew->pszProduct,
715	pNew->pszManufacturer));
716
717	m_llDevices.insert(it, NewObj);
718
719	devLock.release();
720	alock.release();
721	/* Do any backend specific work. */
722	deviceAdded(NewObj, pNew);
723	m_pUsbProxyService->i_deviceAdded(NewObj, pNew);
724	alock.acquire();
725	}
726	else
727	{
728	/*
729	* Check if the device was actually detached or logically detached
730	* as the result of a re-enumeration.
731	*/
732	if (!pHostDevice->i_wasActuallyDetached())
733	++it;
734	else
735	{
736	it = m_llDevices.erase(it);
737	devLock.release();
738	alock.release();
739	m_pUsbProxyService->i_deviceRemoved(pHostDevice);
740	LogFlowThisFunc(("detached %p {%s}\n",
741	(HostUSBDevice *)pHostDevice,
742	pHostDevice->i_getName().c_str()));
743
744	/* from now on, the object is no more valid,
745	* uninitialize to avoid abuse */
746	devCaller.release();
747	pHostDevice->uninit();
748	alock.acquire();
749	}
750	}
751	}
752	} /* while */
753
754	LogFlowThisFunc(("returns void\n"));
755	}
756
757	/* vi: set tabstop=4 shiftwidth=4 expandtab: */

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source: vbox/trunk/src/VBox/Main/src-server/USBProxyBackend.cpp@ 100841

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