VBoxHostChannelSvc.cpp@ 104932

Last change on this file since 104932 was 98359, checked in by vboxsync, 22 months ago
HostServices/HostChannel: Address two todos [build fix]
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File size: 28.0 KB

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1	/* $Id: VBoxHostChannelSvc.cpp 98359 2023-01-31 11:19:47Z vboxsync $ */
2	/* @file
3	* Host Channel: Host service entry points.
4	*/
5
6	/*
7	* Copyright (C) 2012-2023 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
29	/*
30	* The HostChannel host service provides a generic proxy between a host's
31	* channel provider and a client running in the guest.
32	*
33	* Host providers must register via a HostCall.
34	*
35	* A guest client can connect to a host provider and send/receive data.
36	*
37	* GuestCalls:
38	* * Attach - attach to a host channel
39	* * Detach - completely detach from a channel
40	* * Send - send data from the guest to the channel
41	* * Recv - non blocking read of available data from the channel
42	* * Control - generic channel specific command exchange
43	* * EventWait - wait for a host event
44	* * EventCancel - make the blocking EventWait call to return
45	* HostCalls:
46	* * Register - register a host channel
47	* * Unregister - unregister it
48	*
49	* The guest HGCM client connects to the service. The client can attach multiple channels.
50	*
51	*/
52
53	#include <iprt/alloc.h>
54	#include <iprt/string.h>
55	#include <iprt/assert.h>
56	#include <iprt/critsect.h>
57	#include <VBox/vmm/ssm.h>
58
59	#include "HostChannel.h"
60
61
62	static void VBoxHGCMParmUInt32Set(VBOXHGCMSVCPARM *pParm, uint32_t u32)
63	{
64	pParm->type = VBOX_HGCM_SVC_PARM_32BIT;
65	pParm->u.uint32 = u32;
66	}
67
68	static int VBoxHGCMParmUInt32Get(VBOXHGCMSVCPARM pParm, uint32_t pu32)
69	{
70	if (pParm->type == VBOX_HGCM_SVC_PARM_32BIT)
71	{
72	*pu32 = pParm->u.uint32;
73	return VINF_SUCCESS;
74	}
75
76	AssertFailed();
77	return VERR_INVALID_PARAMETER;
78	}
79
80	#if 0 /* unused */
81	static void VBoxHGCMParmPtrSet(VBOXHGCMSVCPARM pParm, void pv, uint32_t cb)
82	{
83	pParm->type = VBOX_HGCM_SVC_PARM_PTR;
84	pParm->u.pointer.size = cb;
85	pParm->u.pointer.addr = pv;
86	}
87	#endif
88
89	static int VBoxHGCMParmPtrGet(VBOXHGCMSVCPARM pParm, void ppv, uint32_t pcb)
90	{
91	if (pParm->type == VBOX_HGCM_SVC_PARM_PTR)
92	{
93	*ppv = pParm->u.pointer.addr;
94	*pcb = pParm->u.pointer.size;
95	return VINF_SUCCESS;
96	}
97
98	AssertFailed();
99	return VERR_INVALID_PARAMETER;
100	}
101
102
103	static PVBOXHGCMSVCHELPERS g_pHelpers = NULL;
104
105	static RTCRITSECT g_critsect;
106
107	/*
108	* Helpers.
109	*/
110
111	int vboxHostChannelLock(void)
112	{
113	return RTCritSectEnter(&g_critsect);
114	}
115
116	void vboxHostChannelUnlock(void)
117	{
118	RTCritSectLeave(&g_critsect);
119	}
120
121	void vboxHostChannelEventParmsSet(VBOXHGCMSVCPARM *paParms,
122	uint32_t u32ChannelHandle,
123	uint32_t u32Id,
124	const void *pvEvent,
125	uint32_t cbEvent)
126	{
127	if (cbEvent > 0)
128	{
129	void *pvParm = NULL;
130	uint32_t cbParm = 0;
131
132	VBoxHGCMParmPtrGet(&paParms[2], &pvParm, &cbParm);
133
134	uint32_t cbToCopy = RT_MIN(cbParm, cbEvent);
135	if (cbToCopy > 0)
136	{
137	Assert(pvParm);
138	memcpy(pvParm, pvEvent, cbToCopy);
139	}
140	}
141
142	VBoxHGCMParmUInt32Set(&paParms[0], u32ChannelHandle);
143	VBoxHGCMParmUInt32Set(&paParms[1], u32Id);
144	VBoxHGCMParmUInt32Set(&paParms[3], cbEvent);
145	}
146
147	/* This is called under the lock. */
148	void vboxHostChannelReportAsync(VBOXHOSTCHCLIENT *pClient,
149	uint32_t u32ChannelHandle,
150	uint32_t u32Id,
151	const void *pvEvent,
152	uint32_t cbEvent)
153	{
154	Assert(RTCritSectIsOwner(&g_critsect));
155
156	vboxHostChannelEventParmsSet(pClient->async.paParms,
157	u32ChannelHandle,
158	u32Id,
159	pvEvent,
160	cbEvent);
161
162	LogRelFlow(("svcCall: CallComplete for pending\n"));
163
164	g_pHelpers->pfnCallComplete (pClient->async.callHandle, VINF_SUCCESS);
165	}
166
167
168	/*
169	* Service entry points.
170	*/
171
172	static DECLCALLBACK(int) svcUnload(void *pvService)
173	{
174	NOREF(pvService);
175	vboxHostChannelDestroy();
176	RTCritSectDelete(&g_critsect);
177	return VINF_SUCCESS;
178	}
179
180	static DECLCALLBACK(int) svcDisconnect(void pvService, uint32_t u32ClientID, void pvClient)
181	{
182	RT_NOREF2(pvService, u32ClientID);
183
184	VBOXHOSTCHCLIENT pClient = (VBOXHOSTCHCLIENT )pvClient;
185
186	vboxHostChannelClientDisconnect(pClient);
187
188	memset(pClient, 0, sizeof(VBOXHOSTCHCLIENT));
189
190	return VINF_SUCCESS;
191	}
192
193	static DECLCALLBACK(int) svcConnect(void pvService, uint32_t u32ClientID, void pvClient, uint32_t fRequestor, bool fRestoring)
194	{
195	RT_NOREF(pvService, fRequestor, fRestoring);
196	VBOXHOSTCHCLIENT pClient = (VBOXHOSTCHCLIENT )pvClient;
197
198	/* Register the client. */
199	memset(pClient, 0, sizeof(VBOXHOSTCHCLIENT));
200
201	pClient->u32ClientID = u32ClientID;
202
203	int rc = vboxHostChannelClientConnect(pClient);
204
205	LogRel2(("svcConnect: rc = %Rrc\n", rc));
206
207	return rc;
208	}
209
210	static DECLCALLBACK(void) svcCall(void *pvService,
211	VBOXHGCMCALLHANDLE callHandle,
212	uint32_t u32ClientID,
213	void *pvClient,
214	uint32_t u32Function,
215	uint32_t cParms,
216	VBOXHGCMSVCPARM paParms[],
217	uint64_t tsArrival)
218	{
219	RT_NOREF(pvService, tsArrival);
220
221	int rc = VINF_SUCCESS;
222
223	LogRel2(("svcCall: u32ClientID = %d, fn = %d, cParms = %d, pparms = %d\n",
224	u32ClientID, u32Function, cParms, paParms));
225
226	VBOXHOSTCHCLIENT pClient = (VBOXHOSTCHCLIENT )pvClient;
227
228	bool fAsynchronousProcessing = false;
229
230	#ifdef DEBUG
231	uint32_t i;
232
233	for (i = 0; i < cParms; i++)
234	{
235	/** @todo parameters other than 32 bit */
236	LogRel2((" pparms[%d]: type %d value %d\n", i, paParms[i].type, paParms[i].u.uint32));
237	}
238	#endif
239
240	switch (u32Function)
241	{
242	case VBOX_HOST_CHANNEL_FN_ATTACH:
243	{
244	LogRel2(("svcCall: VBOX_HOST_CHANNEL_FN_ATTACH\n"));
245
246	if (cParms != 3)
247	rc = VERR_INVALID_PARAMETER;
248	else if ( paParms[0].type != VBOX_HGCM_SVC_PARM_PTR /* name */
249	\|\| paParms[1].type != VBOX_HGCM_SVC_PARM_32BIT /* flags */
250	\|\| paParms[2].type != VBOX_HGCM_SVC_PARM_32BIT /* handle */
251	)
252	rc = VERR_INVALID_PARAMETER;
253	else
254	{
255	uint32_t u32Flags = 0; /* Shut up msvc*/
256	const char *pszName;
257	uint32_t cbName;
258
259	rc = VBoxHGCMParmPtrGet(&paParms[0], (void **)&pszName, &cbName);
260	if ( RT_SUCCESS(rc)
261	&& pszName[cbName - 1] != '\0')
262	rc = VERR_INVALID_PARAMETER;
263	if (RT_SUCCESS(rc))
264	rc = VBoxHGCMParmUInt32Get(&paParms[1], &u32Flags);
265	if (RT_SUCCESS(rc))
266	{
267	uint32_t u32Handle = 0;
268	rc = vboxHostChannelAttach(pClient, &u32Handle, pszName, u32Flags);
269	if (RT_SUCCESS(rc))
270	VBoxHGCMParmUInt32Set(&paParms[2], u32Handle);
271	}
272	}
273	} break;
274
275	case VBOX_HOST_CHANNEL_FN_DETACH:
276	{
277	LogRel2(("svcCall: VBOX_HOST_CHANNEL_FN_DETACH\n"));
278
279	if (cParms != 1)
280	{
281	rc = VERR_INVALID_PARAMETER;
282	}
283	else if ( paParms[0].type != VBOX_HGCM_SVC_PARM_32BIT /* handle */
284	)
285	{
286	rc = VERR_INVALID_PARAMETER;
287	}
288	else
289	{
290	uint32_t u32Handle;
291
292	rc = VBoxHGCMParmUInt32Get(&paParms[0], &u32Handle);
293
294	if (RT_SUCCESS(rc))
295	{
296	rc = vboxHostChannelDetach(pClient, u32Handle);
297	}
298	}
299	} break;
300
301	case VBOX_HOST_CHANNEL_FN_SEND:
302	{
303	LogRel2(("svcCall: VBOX_HOST_CHANNEL_FN_SEND\n"));
304
305	if (cParms != 2)
306	{
307	rc = VERR_INVALID_PARAMETER;
308	}
309	else if ( paParms[0].type != VBOX_HGCM_SVC_PARM_32BIT /* handle */
310	\|\| paParms[1].type != VBOX_HGCM_SVC_PARM_PTR /* data */
311	)
312	{
313	rc = VERR_INVALID_PARAMETER;
314	}
315	else
316	{
317	uint32_t u32Handle;
318	void *pvData;
319	uint32_t cbData;
320
321	rc = VBoxHGCMParmUInt32Get (&paParms[0], &u32Handle);
322
323	if (RT_SUCCESS (rc))
324	{
325	rc = VBoxHGCMParmPtrGet (&paParms[1], &pvData, &cbData);
326
327	if (RT_SUCCESS (rc))
328	{
329	rc = vboxHostChannelSend(pClient, u32Handle, pvData, cbData);
330	}
331	}
332	}
333	} break;
334
335	case VBOX_HOST_CHANNEL_FN_RECV:
336	{
337	LogRel2(("svcCall: VBOX_HOST_CHANNEL_FN_RECV\n"));
338
339	if (cParms != 4)
340	{
341	rc = VERR_INVALID_PARAMETER;
342	}
343	else if ( paParms[0].type != VBOX_HGCM_SVC_PARM_32BIT /* handle */
344	\|\| paParms[1].type != VBOX_HGCM_SVC_PARM_PTR /* data */
345	\|\| paParms[2].type != VBOX_HGCM_SVC_PARM_32BIT /* sizeReceived */
346	\|\| paParms[3].type != VBOX_HGCM_SVC_PARM_32BIT /* sizeRemaining */
347	)
348	{
349	rc = VERR_INVALID_PARAMETER;
350	}
351	else
352	{
353	uint32_t u32Handle;
354	void *pvData;
355	uint32_t cbData;
356
357	rc = VBoxHGCMParmUInt32Get (&paParms[0], &u32Handle);
358
359	if (RT_SUCCESS (rc))
360	{
361	rc = VBoxHGCMParmPtrGet (&paParms[1], &pvData, &cbData);
362
363	if (RT_SUCCESS (rc))
364	{
365	uint32_t u32SizeReceived = 0;
366	uint32_t u32SizeRemaining = 0;
367
368	rc = vboxHostChannelRecv(pClient, u32Handle,
369	pvData, cbData,
370	&u32SizeReceived, &u32SizeRemaining);
371
372	if (RT_SUCCESS(rc))
373	{
374	VBoxHGCMParmUInt32Set(&paParms[2], u32SizeReceived);
375	VBoxHGCMParmUInt32Set(&paParms[3], u32SizeRemaining);
376	}
377	}
378	}
379	}
380	} break;
381
382	case VBOX_HOST_CHANNEL_FN_CONTROL:
383	{
384	LogRel2(("svcCall: VBOX_HOST_CHANNEL_FN_CONTROL\n"));
385
386	if (cParms != 5)
387	{
388	rc = VERR_INVALID_PARAMETER;
389	}
390	else if ( paParms[0].type != VBOX_HGCM_SVC_PARM_32BIT /* handle */
391	\|\| paParms[1].type != VBOX_HGCM_SVC_PARM_32BIT /* code */
392	\|\| paParms[2].type != VBOX_HGCM_SVC_PARM_PTR /* parm */
393	\|\| paParms[3].type != VBOX_HGCM_SVC_PARM_PTR /* data */
394	\|\| paParms[4].type != VBOX_HGCM_SVC_PARM_32BIT /* sizeDataReturned */
395	)
396	{
397	rc = VERR_INVALID_PARAMETER;
398	}
399	else
400	{
401	uint32_t u32Handle;
402	uint32_t u32Code;
403	void *pvParm;
404	uint32_t cbParm;
405	void *pvData;
406	uint32_t cbData;
407
408	rc = VBoxHGCMParmUInt32Get (&paParms[0], &u32Handle);
409
410	if (RT_SUCCESS (rc))
411	{
412	rc = VBoxHGCMParmUInt32Get (&paParms[1], &u32Code);
413
414	if (RT_SUCCESS (rc))
415	{
416	rc = VBoxHGCMParmPtrGet (&paParms[2], &pvParm, &cbParm);
417
418	if (RT_SUCCESS (rc))
419	{
420	rc = VBoxHGCMParmPtrGet (&paParms[3], &pvData, &cbData);
421
422	if (RT_SUCCESS (rc))
423	{
424	uint32_t u32SizeDataReturned = 0;
425
426	rc = vboxHostChannelControl(pClient, u32Handle, u32Code,
427	pvParm, cbParm,
428	pvData, cbData, &u32SizeDataReturned);
429	if (RT_SUCCESS(rc))
430	{
431	VBoxHGCMParmUInt32Set(&paParms[4], u32SizeDataReturned);
432	}
433	}
434	}
435	}
436	}
437	}
438	} break;
439
440	case VBOX_HOST_CHANNEL_FN_EVENT_WAIT:
441	{
442	LogRel2(("svcCall: VBOX_HOST_CHANNEL_FN_EVENT_WAIT\n"));
443
444	if (cParms != 4)
445	{
446	rc = VERR_INVALID_PARAMETER;
447	}
448	else if ( paParms[0].type != VBOX_HGCM_SVC_PARM_32BIT /* handle */
449	\|\| paParms[1].type != VBOX_HGCM_SVC_PARM_32BIT /* id */
450	\|\| paParms[2].type != VBOX_HGCM_SVC_PARM_PTR /* parm */
451	\|\| paParms[3].type != VBOX_HGCM_SVC_PARM_32BIT /* sizeReturned */
452	)
453	{
454	rc = VERR_INVALID_PARAMETER;
455	}
456	else
457	{
458	bool fEvent = false;
459
460	rc = vboxHostChannelEventWait(pClient, &fEvent, callHandle, paParms);
461
462	if (RT_SUCCESS(rc))
463	{
464	if (!fEvent)
465	{
466	/* No event available at the time. Process asynchronously. */
467	fAsynchronousProcessing = true;
468
469	LogRel2(("svcCall: async.\n"));
470	}
471	}
472	}
473	} break;
474
475	case VBOX_HOST_CHANNEL_FN_EVENT_CANCEL:
476	{
477	LogRel2(("svcCall: VBOX_HOST_CHANNEL_FN_EVENT_CANCEL\n"));
478
479	if (cParms != 0)
480	{
481	rc = VERR_INVALID_PARAMETER;
482	}
483	else
484	{
485	rc = vboxHostChannelEventCancel(pClient);
486	}
487	} break;
488
489	case VBOX_HOST_CHANNEL_FN_QUERY:
490	{
491	LogRel2(("svcCall: VBOX_HOST_CHANNEL_FN_QUERY\n"));
492
493	if (cParms != 5)
494	{
495	rc = VERR_INVALID_PARAMETER;
496	}
497	else if ( paParms[0].type != VBOX_HGCM_SVC_PARM_PTR /* channel name */
498	\|\| paParms[1].type != VBOX_HGCM_SVC_PARM_32BIT /* code */
499	\|\| paParms[2].type != VBOX_HGCM_SVC_PARM_PTR /* parm */
500	\|\| paParms[3].type != VBOX_HGCM_SVC_PARM_PTR /* data */
501	\|\| paParms[4].type != VBOX_HGCM_SVC_PARM_32BIT /* sizeDataReturned */
502	)
503	{
504	rc = VERR_INVALID_PARAMETER;
505	}
506	else
507	{
508	const char *pszName;
509	uint32_t cbName;
510	uint32_t u32Code = 0; /* Shut up msvc*/
511	void pvParm = NULL; / Shut up msvc*/
512	uint32_t cbParm = 0; /* Shut up msvc*/
513	void pvData = NULL; / Shut up msvc*/
514	uint32_t cbData = 0; /* Shut up msvc*/
515
516	rc = VBoxHGCMParmPtrGet(&paParms[0], (void **)&pszName, &cbName);
517	if ( RT_SUCCESS(rc)
518	&& pszName[cbName - 1] != '\0')
519	rc = VERR_INVALID_PARAMETER;
520
521	if (RT_SUCCESS(rc))
522	rc = VBoxHGCMParmUInt32Get(&paParms[1], &u32Code);
523	if (RT_SUCCESS (rc))
524	rc = VBoxHGCMParmPtrGet(&paParms[2], &pvParm, &cbParm);
525	if (RT_SUCCESS (rc))
526	rc = VBoxHGCMParmPtrGet(&paParms[3], &pvData, &cbData);
527	if (RT_SUCCESS (rc))
528	{
529	uint32_t u32SizeDataReturned = 0;
530	rc = vboxHostChannelQuery(pClient, pszName, u32Code,
531	pvParm, cbParm,
532	pvData, cbData, &u32SizeDataReturned);
533	if (RT_SUCCESS(rc))
534	VBoxHGCMParmUInt32Set(&paParms[4], u32SizeDataReturned);
535	}
536	}
537	} break;
538
539	default:
540	{
541	rc = VERR_NOT_IMPLEMENTED;
542	}
543	}
544
545	LogRelFlow(("svcCall: rc = %Rrc, async %d\n", rc, fAsynchronousProcessing));
546
547	if (!fAsynchronousProcessing)
548	{
549	g_pHelpers->pfnCallComplete(callHandle, rc);
550	}
551	}
552
553	static DECLCALLBACK(int) svcHostCall(void *pvService,
554	uint32_t u32Function,
555	uint32_t cParms,
556	VBOXHGCMSVCPARM paParms[])
557	{
558	NOREF(pvService);
559
560	int rc = VINF_SUCCESS;
561
562	LogRel2(("svcHostCall: fn = %d, cParms = %d, pparms = %d\n",
563	u32Function, cParms, paParms));
564
565	switch (u32Function)
566	{
567	case VBOX_HOST_CHANNEL_HOST_FN_REGISTER:
568	{
569	LogRel2(("svcCall: VBOX_HOST_CHANNEL_HOST_FN_REGISTER\n"));
570
571	if (cParms != 2)
572	{
573	rc = VERR_INVALID_PARAMETER;
574	}
575	else if ( paParms[0].type != VBOX_HGCM_SVC_PARM_PTR /* name */
576	\|\| paParms[1].type != VBOX_HGCM_SVC_PARM_PTR /* iface */
577	)
578	{
579	rc = VERR_INVALID_PARAMETER;
580	}
581	else
582	{
583	void *pvName;
584	uint32_t cbName;
585	void *pvInterface;
586	uint32_t cbInterface;
587
588	rc = VBoxHGCMParmPtrGet(&paParms[0], &pvName, &cbName);
589
590	if (RT_SUCCESS(rc))
591	{
592	rc = VBoxHGCMParmPtrGet(&paParms[1], &pvInterface, &cbInterface);
593
594	if (RT_SUCCESS(rc))
595	{
596	rc = vboxHostChannelRegister((const char *)pvName,
597	(VBOXHOSTCHANNELINTERFACE *)pvInterface, cbInterface);
598	}
599	}
600	}
601	} break;
602
603	case VBOX_HOST_CHANNEL_HOST_FN_UNREGISTER:
604	{
605	LogRel2(("svcCall: VBOX_HOST_CHANNEL_HOST_FN_UNREGISTER\n"));
606
607	if (cParms != 1)
608	{
609	rc = VERR_INVALID_PARAMETER;
610	}
611	else if ( paParms[0].type != VBOX_HGCM_SVC_PARM_PTR /* name */
612	)
613	{
614	rc = VERR_INVALID_PARAMETER;
615	}
616	else
617	{
618	void *pvName;
619	uint32_t cbName;
620
621	rc = VBoxHGCMParmPtrGet(&paParms[0], &pvName, &cbName);
622
623	if (RT_SUCCESS(rc))
624	{
625	rc = vboxHostChannelUnregister((const char *)pvName);
626	}
627	}
628	} break;
629
630	default:
631	break;
632	}
633
634	LogRelFlow(("svcHostCall: rc = %Rrc\n", rc));
635	return rc;
636	}
637
638	#if 0
639	/** If the client in the guest is waiting for a read operation to complete
640	* then complete it, otherwise return. See the protocol description in the
641	* shared clipboard module description. */
642	void vboxSvcClipboardCompleteReadData(VBOXHOSTCHCLIENT *pClient, int rc, uint32_t cbActual)
643	{
644	VBOXHGCMCALLHANDLE callHandle = NULL;
645	VBOXHGCMSVCPARM *paParms = NULL;
646	bool fReadPending = false;
647	if (vboxSvcClipboardLock()) /* if not can we do anything useful? */
648	{
649	callHandle = pClient->asyncRead.callHandle;
650	paParms = pClient->asyncRead.paParms;
651	fReadPending = pClient->fReadPending;
652	pClient->fReadPending = false;
653	vboxSvcClipboardUnlock();
654	}
655	if (fReadPending)
656	{
657	VBoxHGCMParmUInt32Set (&paParms[2], cbActual);
658	g_pHelpers->pfnCallComplete (callHandle, rc);
659	}
660	}
661
662	/**
663	* SSM descriptor table for the VBOXHOSTCHCLIENT structure.
664	*/
665	static SSMFIELD const g_aClipboardClientDataFields[] =
666	{
667	SSMFIELD_ENTRY(VBOXHOSTCHCLIENT, u32ClientID), /* for validation purposes */
668	SSMFIELD_ENTRY(VBOXHOSTCHCLIENT, fMsgQuit),
669	SSMFIELD_ENTRY(VBOXHOSTCHCLIENT, fMsgReadData),
670	SSMFIELD_ENTRY(VBOXHOSTCHCLIENT, fMsgFormats),
671	SSMFIELD_ENTRY(VBOXHOSTCHCLIENT, u32RequestedFormat),
672	SSMFIELD_ENTRY_TERM()
673	};
674
675	static DECLCALLBACK(int) svcSaveState(void pvService, uint32_t u32ClientID, void pvClient, PSSMHANDLE pSSM)
676	{
677	NOREF(pvService);
678
679	/* If there are any pending requests, they must be completed here. Since
680	* the service is single threaded, there could be only requests
681	* which the service itself has postponed.
682	*
683	* HGCM knows that the state is being saved and that the pfnComplete
684	* calls are just clean ups. These requests are saved by the VMMDev.
685	*
686	* When the state will be restored, these requests will be reissued
687	* by VMMDev. The service therefore must save state as if there were no
688	* pending request.
689	*/
690	LogRel2 (("svcSaveState: u32ClientID = %d\n", u32ClientID));
691
692	VBOXHOSTCHCLIENT pClient = (VBOXHOSTCHCLIENT )pvClient;
693
694	/* This field used to be the length. We're using it as a version field
695	with the high bit set. */
696	SSMR3PutU32 (pSSM, UINT32_C (0x80000002));
697	int rc = SSMR3PutStructEx (pSSM, pClient, sizeof(pClient), 0 /fFlags*/, &g_aClipboardClientDataFields[0], NULL);
698	AssertRCReturn (rc, rc);
699
700	if (pClient->fAsync)
701	{
702	g_pHelpers->pfnCallComplete (pClient->async.callHandle, VINF_SUCCESS /* error code is not important here. */);
703	pClient->fAsync = false;
704	}
705
706	vboxSvcClipboardCompleteReadData (pClient, VINF_SUCCESS, 0);
707
708	return VINF_SUCCESS;
709	}
710
711	/**
712	* This structure corresponds to the original layout of the
713	* VBOXHOSTCHCLIENT structure. As the structure was saved as a whole
714	* when saving state, we need to remember it forever in order to preserve
715	* compatibility.
716	*
717	* (Starting with 3.1 this is no longer used.)
718	*
719	* @remarks Putting this outside svcLoadState to avoid visibility warning caused
720	* by -Wattributes.
721	*/
722	typedef struct CLIPSAVEDSTATEDATA
723	{
724	struct CLIPSAVEDSTATEDATA *pNext;
725	struct CLIPSAVEDSTATEDATA *pPrev;
726
727	VBOXCLIPBOARDCONTEXT *pCtx;
728
729	uint32_t u32ClientID;
730
731	bool fAsync: 1; /* Guest is waiting for a message. */
732
733	bool fMsgQuit: 1;
734	bool fMsgReadData: 1;
735	bool fMsgFormats: 1;
736
737	struct {
738	VBOXHGCMCALLHANDLE callHandle;
739	VBOXHGCMSVCPARM *paParms;
740	} async;
741
742	struct {
743	void *pv;
744	uint32_t cb;
745	uint32_t u32Format;
746	} data;
747
748	uint32_t u32AvailableFormats;
749	uint32_t u32RequestedFormat;
750
751	} CLIPSAVEDSTATEDATA;
752
753	static DECLCALLBACK(int) svcLoadState(void , uint32_t u32ClientID, void pvClient, PSSMHANDLE pSSM)
754	{
755	LogRel2 (("svcLoadState: u32ClientID = %d\n", u32ClientID));
756
757	VBOXHOSTCHCLIENT pClient = (VBOXHOSTCHCLIENT )pvClient;
758
759	/* Existing client can not be in async state yet. */
760	Assert (!pClient->fAsync);
761
762	/* Save the client ID for data validation. */
763	/** @todo isn't this the same as u32ClientID? Playing safe for now... */
764	uint32_t const u32ClientIDOld = pClient->u32ClientID;
765
766	/* Restore the client data. */
767	uint32_t lenOrVer;
768	int rc = SSMR3GetU32 (pSSM, &lenOrVer);
769	AssertRCReturn (rc, rc);
770	if (lenOrVer == UINT32_C (0x80000002))
771	{
772	rc = SSMR3GetStructEx (pSSM, pClient, sizeof(pClient), 0 /fFlags*/, &g_aClipboardClientDataFields[0], NULL);
773	AssertRCReturn (rc, rc);
774	}
775	else if (lenOrVer == (SSMR3HandleHostBits (pSSM) == 64 ? 72 : 48))
776	{
777	/**
778	* SSM descriptor table for the CLIPSAVEDSTATEDATA structure.
779	*/
780	static SSMFIELD const s_aClipSavedStateDataFields30[] =
781	{
782	SSMFIELD_ENTRY_IGN_HCPTR( CLIPSAVEDSTATEDATA, pNext),
783	SSMFIELD_ENTRY_IGN_HCPTR( CLIPSAVEDSTATEDATA, pPrev),
784	SSMFIELD_ENTRY_IGN_HCPTR( CLIPSAVEDSTATEDATA, pCtx),
785	SSMFIELD_ENTRY( CLIPSAVEDSTATEDATA, u32ClientID),
786	SSMFIELD_ENTRY_CUSTOM(fMsgQuit+fMsgReadData+fMsgFormats, RT_OFFSETOF(CLIPSAVEDSTATEDATA, u32ClientID) + 4, 4),
787	SSMFIELD_ENTRY_IGN_HCPTR( CLIPSAVEDSTATEDATA, async.callHandle),
788	SSMFIELD_ENTRY_IGN_HCPTR( CLIPSAVEDSTATEDATA, async.paParms),
789	SSMFIELD_ENTRY_IGNORE( CLIPSAVEDSTATEDATA, data.pv),
790	SSMFIELD_ENTRY_IGNORE( CLIPSAVEDSTATEDATA, data.cb),
791	SSMFIELD_ENTRY_IGNORE( CLIPSAVEDSTATEDATA, data.u32Format),
792	SSMFIELD_ENTRY_IGNORE( CLIPSAVEDSTATEDATA, u32AvailableFormats),
793	SSMFIELD_ENTRY( CLIPSAVEDSTATEDATA, u32RequestedFormat),
794	SSMFIELD_ENTRY_TERM()
795	};
796
797	CLIPSAVEDSTATEDATA savedState;
798	RT_ZERO (savedState);
799	rc = SSMR3GetStructEx (pSSM, &savedState, sizeof(savedState), SSMSTRUCT_FLAGS_MEM_BAND_AID,
800	&s_aClipSavedStateDataFields30[0], NULL);
801	AssertRCReturn (rc, rc);
802
803	pClient->fMsgQuit = savedState.fMsgQuit;
804	pClient->fMsgReadData = savedState.fMsgReadData;
805	pClient->fMsgFormats = savedState.fMsgFormats;
806	pClient->u32RequestedFormat = savedState.u32RequestedFormat;
807	}
808	else
809	{
810	LogRel (("Client data size mismatch: got %#x\n", lenOrVer));
811	return VERR_SSM_DATA_UNIT_FORMAT_CHANGED;
812	}
813
814	/* Verify the client ID. */
815	if (pClient->u32ClientID != u32ClientIDOld)
816	{
817	LogRel (("Client ID mismatch: expected %d, got %d\n", u32ClientIDOld, pClient->u32ClientID));
818	pClient->u32ClientID = u32ClientIDOld;
819	return VERR_SSM_DATA_UNIT_FORMAT_CHANGED;
820	}
821
822	/* Actual host data are to be reported to guest (SYNC). */
823	vboxClipboardSync (pClient);
824
825	return VINF_SUCCESS;
826	}
827	#endif
828
829	static int svcInit(void)
830	{
831	int rc = RTCritSectInit(&g_critsect);
832
833	if (RT_SUCCESS (rc))
834	{
835	rc = vboxHostChannelInit();
836
837	/* Clean up on failure, because 'svnUnload' will not be called
838	* if the 'svcInit' returns an error.
839	*/
840	if (RT_FAILURE(rc))
841	{
842	RTCritSectDelete(&g_critsect);
843	}
844	}
845
846	return rc;
847	}
848
849	extern "C" DECLCALLBACK(DECLEXPORT(int)) VBoxHGCMSvcLoad(VBOXHGCMSVCFNTABLE *pTable)
850	{
851	int rc = VINF_SUCCESS;
852
853	LogRelFlowFunc(("pTable = %p\n", pTable));
854
855	if (!pTable)
856	{
857	rc = VERR_INVALID_PARAMETER;
858	}
859	else
860	{
861	LogRel2(("VBoxHGCMSvcLoad: pTable->cbSize = %d, pTable->u32Version = 0x%08X\n",
862	pTable->cbSize, pTable->u32Version));
863
864	if ( pTable->cbSize != sizeof (VBOXHGCMSVCFNTABLE)
865	\|\| pTable->u32Version != VBOX_HGCM_SVC_VERSION)
866	{
867	rc = VERR_INVALID_PARAMETER;
868	}
869	else
870	{
871	g_pHelpers = pTable->pHelpers;
872
873	pTable->cbClient = sizeof(VBOXHOSTCHCLIENT);
874
875	pTable->pfnUnload = svcUnload;
876	pTable->pfnConnect = svcConnect;
877	pTable->pfnDisconnect = svcDisconnect;
878	pTable->pfnCall = svcCall;
879	pTable->pfnHostCall = svcHostCall;
880	pTable->pfnSaveState = NULL; // svcSaveState;
881	pTable->pfnLoadState = NULL; // svcLoadState;
882	pTable->pfnRegisterExtension = NULL;
883	pTable->pvService = NULL;
884
885	/* Service specific initialization. */
886	rc = svcInit();
887	}
888	}
889
890	return rc;
891	}

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source: vbox/trunk/src/VBox/HostServices/HostChannel/VBoxHostChannelSvc.cpp@ 104932

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