VBoxSharedClipboardSvc-x11.cpp@ 85179

Last change on this file since 85179 was 84142, checked in by vboxsync, 5 years ago
Shared Clipboard/HostService: Renaming to match terminology (SvcImpl -> Backend).
Property svn:eol-style set to `native` Property svn:keywords set to `Author Date Id Revision`
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1	/* $Id: VBoxSharedClipboardSvc-x11.cpp 84142 2020-05-05 07:13:00Z vboxsync $ */
2	/** @file
3	* Shared Clipboard Service - Linux host.
4	*/
5
6	/*
7	* Copyright (C) 2006-2020 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
19	/*********************************************************************************************************************************
20	* Header Files *
21	*********************************************************************************************************************************/
22	#define LOG_GROUP LOG_GROUP_SHARED_CLIPBOARD
23	#include <iprt/assert.h>
24	#include <iprt/critsect.h>
25	#include <iprt/env.h>
26	#include <iprt/mem.h>
27	#include <iprt/semaphore.h>
28	#include <iprt/string.h>
29
30	#include <VBox/GuestHost/SharedClipboard.h>
31	#include <VBox/GuestHost/SharedClipboard-x11.h>
32	#include <VBox/HostServices/VBoxClipboardSvc.h>
33	#include <iprt/errcore.h>
34
35	#include "VBoxSharedClipboardSvc-internal.h"
36
37
38	/*********************************************************************************************************************************
39	* Structures and Typedefs *
40	*********************************************************************************************************************************/
41	/**
42	* Global context information used by the host glue for the X11 clipboard backend.
43	*/
44	struct SHCLCONTEXT
45	{
46	/** This mutex is grabbed during any critical operations on the clipboard
47	* which might clash with others. */
48	RTCRITSECT CritSect;
49	/** X11 context data. */
50	SHCLX11CTX X11;
51	/** Pointer to the VBox host client data structure. */
52	PSHCLCLIENT pClient;
53	/** We set this when we start shutting down as a hint not to post any new
54	* requests. */
55	bool fShuttingDown;
56	};
57
58
59	int ShClBackendInit(void)
60	{
61	LogFlowFuncEnter();
62	return VINF_SUCCESS;
63	}
64
65	void ShClBackendDestroy(void)
66	{
67	LogFlowFuncEnter();
68	}
69
70	/**
71	* @note On the host, we assume that some other application already owns
72	* the clipboard and leave ownership to X11.
73	*/
74	int ShClBackendConnect(PSHCLCLIENT pClient, bool fHeadless)
75	{
76	int rc;
77
78	PSHCLCONTEXT pCtx = (PSHCLCONTEXT)RTMemAllocZ(sizeof(SHCLCONTEXT));
79	if (pCtx)
80	{
81	rc = RTCritSectInit(&pCtx->CritSect);
82	if (RT_SUCCESS(rc))
83	{
84	rc = ShClX11Init(&pCtx->X11, pCtx, fHeadless);
85	if (RT_SUCCESS(rc))
86	{
87	pClient->State.pCtx = pCtx;
88	pCtx->pClient = pClient;
89
90	rc = ShClX11ThreadStart(&pCtx->X11, true /* grab shared clipboard */);
91	if (RT_FAILURE(rc))
92	ShClX11Destroy(&pCtx->X11);
93	}
94
95	if (RT_FAILURE(rc))
96	RTCritSectDelete(&pCtx->CritSect);
97	}
98	else
99	RTMemFree(pCtx);
100	}
101	else
102	rc = VERR_NO_MEMORY;
103
104	LogFlowFuncLeaveRC(rc);
105	return rc;
106	}
107
108	int ShClBackendSync(PSHCLCLIENT pClient)
109	{
110	LogFlowFuncEnter();
111
112	/* Tell the guest we have no data in case X11 is not available. If
113	* there is data in the host clipboard it will automatically be sent to
114	* the guest when the clipboard starts up. */
115	return ShClSvcHostReportFormats(pClient, VBOX_SHCL_FMT_NONE);
116	}
117
118	/**
119	* Shut down the shared clipboard service and "disconnect" the guest.
120	* @note Host glue code
121	*/
122	int ShClBackendDisconnect(PSHCLCLIENT pClient)
123	{
124	LogFlowFuncEnter();
125
126	PSHCLCONTEXT pCtx = pClient->State.pCtx;
127	AssertPtr(pCtx);
128
129	/* Drop the reference to the client, in case it is still there. This
130	* will cause any outstanding clipboard data requests from X11 to fail
131	* immediately. */
132	pCtx->fShuttingDown = true;
133
134	int rc = ShClX11ThreadStop(&pCtx->X11);
135	/** @todo handle this slightly more reasonably, or be really sure
136	* it won't go wrong. */
137	AssertRC(rc);
138
139	ShClX11Destroy(&pCtx->X11);
140	RTCritSectDelete(&pCtx->CritSect);
141
142	RTMemFree(pCtx);
143
144	LogFlowFuncLeaveRC(rc);
145	return rc;
146	}
147
148	int ShClBackendFormatAnnounce(PSHCLCLIENT pClient, SHCLFORMATS fFormats)
149	{
150	int rc = ShClX11ReportFormatsToX11(&pClient->State.pCtx->X11, fFormats);
151
152	LogFlowFuncLeaveRC(rc);
153	return rc;
154	}
155
156	/** Structure describing a request for clipoard data from the guest. */
157	struct CLIPREADCBREQ
158	{
159	/** User-supplied data pointer, based on the request type. */
160	void *pv;
161	/** The size (in bytes) of the the user-supplied pointer in pv. */
162	uint32_t cb;
163	/** The actual size of the data written. */
164	uint32_t *pcbActual;
165	/** The request's event ID. */
166	SHCLEVENTID idEvent;
167	};
168
169	/**
170	* @note We always fail or complete asynchronously.
171	* @note On success allocates a CLIPREADCBREQ structure which must be
172	* freed in ClipCompleteDataRequestFromX11 when it is called back from
173	* the backend code.
174	*/
175	int ShClBackendReadData(PSHCLCLIENT pClient,
176	PSHCLCLIENTCMDCTX pCmdCtx, SHCLFORMAT uFormat, void pvData, uint32_t cbData, uint32_t pcbActual)
177	{
178	AssertPtrReturn(pClient, VERR_INVALID_POINTER);
179	AssertPtrReturn(pCmdCtx, VERR_INVALID_POINTER);
180	AssertPtrReturn(pvData, VERR_INVALID_POINTER);
181
182	RT_NOREF(pCmdCtx);
183
184	LogFlowFunc(("pClient=%p, uFormat=%02X, pv=%p, cb=%u, pcbActual=%p\n",
185	pClient, uFormat, pvData, cbData, pcbActual));
186
187	int rc = VINF_SUCCESS;
188
189	CLIPREADCBREQ pReq = (CLIPREADCBREQ )RTMemAllocZ(sizeof(CLIPREADCBREQ));
190	if (pReq)
191	{
192	pReq->pv = pvData;
193	pReq->cb = cbData;
194	pReq->pcbActual = pcbActual;
195	const SHCLEVENTID idEvent = ShClEventIdGenerateAndRegister(&pClient->EventSrc);
196	pReq->idEvent = idEvent;
197	if (idEvent != NIL_SHCLEVENTID)
198	{
199	rc = ShClX11ReadDataFromX11(&pClient->State.pCtx->X11, uFormat, pReq);
200	if (RT_SUCCESS(rc))
201	{
202	PSHCLEVENTPAYLOAD pPayload;
203	rc = ShClEventWait(&pClient->EventSrc, idEvent, 30 * 1000, &pPayload);
204	if (RT_SUCCESS(rc))
205	{
206	memcpy(pvData, pPayload->pvData, RT_MIN(cbData, pPayload->cbData));
207
208	*pcbActual = (uint32_t)pPayload->cbData;
209
210	ShClPayloadFree(pPayload);
211	}
212	}
213
214	ShClEventUnregister(&pClient->EventSrc, idEvent);
215	}
216	else
217	{
218	RTMemFree(pReq);
219	rc = VERR_SHCLPB_MAX_EVENTS_REACHED;
220	}
221	}
222	else
223	rc = VERR_NO_MEMORY;
224
225	LogFlowFuncLeaveRC(rc);
226	return rc;
227	}
228
229	int ShClBackendWriteData(PSHCLCLIENT pClient,
230	PSHCLCLIENTCMDCTX pCmdCtx, SHCLFORMAT uFormat, void *pvData, uint32_t cbData)
231	{
232	AssertPtrReturn(pClient, VERR_INVALID_POINTER);
233	AssertPtrReturn(pCmdCtx, VERR_INVALID_POINTER);
234	AssertPtrReturn(pvData, VERR_INVALID_POINTER);
235
236	LogFlowFunc(("pClient=%p, pv=%p, cb=%RU32, uFormat=%02X\n",
237	pClient, pvData, cbData, uFormat));
238
239	int rc = ShClSvcDataReadSignal(pClient, pCmdCtx, uFormat, pvData, cbData);
240
241	LogFlowFuncLeaveRC(rc);
242	return rc;
243	}
244
245	/**
246	* Reports formats available in the X11 clipboard to VBox.
247	*
248	* @note Runs in Xt event thread.
249	*
250	* @param pCtx Opaque context pointer for the glue code.
251	* @param fFormats The formats available.
252	*/
253	DECLCALLBACK(void) ShClX11ReportFormatsCallback(PSHCLCONTEXT pCtx, uint32_t fFormats)
254	{
255	LogFlowFunc(("pCtx=%p, fFormats=%#x\n", pCtx, fFormats));
256
257	/** @todo r=bird: BUGBUG: Revisit this */
258	if (fFormats == VBOX_SHCL_FMT_NONE) /* No formats to report? Bail out early. */
259	return;
260
261	int rc = ShClSvcHostReportFormats(pCtx->pClient, fFormats);
262	RT_NOREF(rc);
263
264	LogFlowFuncLeaveRC(rc);
265	}
266
267	/**
268	* Completes a request from the host service for reading the X11 clipboard data.
269	* The data should be written to the buffer provided in the initial request.
270	*
271	* @note Runs in Xt event thread.
272	*
273	* @param pCtx Request context information.
274	* @param rcCompletion The completion status of the request.
275	* @param pReq Request to complete.
276	* @param pv Address of data from completed request. Optional.
277	* @param cb Size (in bytes) of data from completed request. Optional.
278	*
279	* @todo Change this to deal with the buffer issues rather than offloading them onto the caller.
280	*/
281	DECLCALLBACK(void) ShClX11RequestFromX11CompleteCallback(PSHCLCONTEXT pCtx, int rcCompletion,
282	CLIPREADCBREQ pReq, void pv, uint32_t cb)
283	{
284	RT_NOREF(rcCompletion);
285
286	LogFlowFunc(("rcCompletion=%Rrc, pReq=%p, pv=%p, cb=%RU32, idEvent=%RU32\n", rcCompletion, pReq, pv, cb, pReq->idEvent));
287
288	AssertMsgRC(rcCompletion, ("Clipboard data completion from X11 failed with %Rrc\n", rcCompletion));
289
290	if (pReq->idEvent != NIL_SHCLEVENTID)
291	{
292	int rc2;
293
294	PSHCLEVENTPAYLOAD pPayload = NULL;
295	if (pv && cb)
296	{
297	rc2 = ShClPayloadAlloc(pReq->idEvent, pv, cb, &pPayload);
298	AssertRC(rc2);
299	}
300
301	RTCritSectEnter(&pCtx->pClient->CritSect);
302	rc2 = ShClEventSignal(&pCtx->pClient->EventSrc, pReq->idEvent, pPayload);
303	AssertRC(rc2);
304	RTCritSectLeave(&pCtx->pClient->CritSect);
305	}
306
307	RTMemFree(pReq);
308	}
309
310	/**
311	* Reads clipboard data from the guest and passes it to the X11 clipboard.
312	*
313	* @note Runs in Xt event thread.
314	*
315	* @param pCtx Pointer to the host clipboard structure.
316	* @param fFormat The format in which the data should be transferred
317	* (VBOX_SHCL_FMT_XXX).
318	* @param ppv On success and if pcb > 0, this will point to a buffer
319	* to be freed with RTMemFree containing the data read.
320	* @param pcb On success, this contains the number of bytes of data
321	* returned.
322	*/
323	DECLCALLBACK(int) ShClX11RequestDataForX11Callback(PSHCLCONTEXT pCtx, SHCLFORMAT fFormat, void *ppv, uint32_t pcb)
324	{
325	LogFlowFunc(("pCtx=%p, Format=0x%x\n", pCtx, fFormat));
326
327	if (pCtx->fShuttingDown)
328	{
329	/* The shared clipboard is disconnecting. */
330	LogRel(("Shared Clipboard: Host requested guest clipboard data after guest had disconnected\n"));
331	return VERR_WRONG_ORDER;
332	}
333
334	int rc;
335
336	#ifdef VBOX_WITH_SHARED_CLIPBOARD_TRANSFERS
337	if (fFormat == VBOX_SHCL_FMT_URI_LIST)
338	rc = VINF_SUCCESS;
339	else
340	#endif
341	{
342	/* Request data from the guest. */
343	SHCLEVENTID idEvent;
344	rc = ShClSvcDataReadRequest(pCtx->pClient, fFormat, &idEvent);
345	if (RT_SUCCESS(rc))
346	{
347	PSHCLEVENTPAYLOAD pPayload;
348	rc = ShClEventWait(&pCtx->pClient->EventSrc, idEvent, 30 * 1000, &pPayload);
349	if (RT_SUCCESS(rc))
350	{
351	*ppv = pPayload ? pPayload->pvData : NULL;
352	*pcb = pPayload ? pPayload->cbData : 0;
353	}
354
355	ShClEventRelease(&pCtx->pClient->EventSrc, idEvent);
356	ShClEventUnregister(&pCtx->pClient->EventSrc, idEvent);
357	}
358	}
359
360	LogFlowFuncLeaveRC(rc);
361	return rc;
362	}
363
364	#ifdef VBOX_WITH_SHARED_CLIPBOARD_TRANSFERS
365
366	int ShClBackendTransferCreate(PSHCLCLIENT pClient, PSHCLTRANSFER pTransfer)
367	{
368	RT_NOREF(pClient, pTransfer);
369
370	int rc = VINF_SUCCESS;
371
372	LogFlowFuncLeaveRC(rc);
373	return rc;
374	}
375
376	int ShClBackendTransferDestroy(PSHCLCLIENT pClient, PSHCLTRANSFER pTransfer)
377	{
378	RT_NOREF(pClient, pTransfer);
379
380	int rc = VINF_SUCCESS;
381
382	LogFlowFuncLeaveRC(rc);
383	return rc;
384	}
385
386	int ShClBackendTransferGetRoots(PSHCLCLIENT pClient, PSHCLTRANSFER pTransfer)
387	{
388	LogFlowFuncEnter();
389
390	int rc;
391
392	SHCLEVENTID idEvent = ShClEventIdGenerateAndRegister(&pClient->EventSrc);
393	if (idEvent != NIL_SHCLEVENTID)
394	{
395	CLIPREADCBREQ pReq = (CLIPREADCBREQ )RTMemAllocZ(sizeof(CLIPREADCBREQ));
396	if (pReq)
397	{
398	pReq->idEvent = idEvent;
399
400	rc = ShClX11ReadDataFromX11(&pClient->State.pCtx->X11, VBOX_SHCL_FMT_URI_LIST, pReq);
401	if (RT_SUCCESS(rc))
402	{
403	/* X supplies the data asynchronously, so we need to wait for data to arrive first. */
404	PSHCLEVENTPAYLOAD pPayload;
405	rc = ShClEventWait(&pClient->EventSrc, idEvent, 30 * 1000, &pPayload);
406	if (RT_SUCCESS(rc))
407	{
408	rc = ShClTransferRootsSet(pTransfer,
409	(char )pPayload->pvData, pPayload->cbData + 1 / Include termination */);
410	}
411	}
412	}
413	else
414	rc = VERR_NO_MEMORY;
415
416	ShClEventUnregister(&pClient->EventSrc, idEvent);
417	}
418	else
419	rc = VERR_SHCLPB_MAX_EVENTS_REACHED;
420
421	LogFlowFuncLeaveRC(rc);
422	return rc;
423	}
424
425	#endif /* VBOX_WITH_SHARED_CLIPBOARD_TRANSFERS */

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source: vbox/trunk/src/VBox/HostServices/SharedClipboard/VBoxSharedClipboardSvc-x11.cpp@ 85179

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