SUPSvcGrant.cpp@ 84288

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1	/* $Id: SUPSvcGrant.cpp 82968 2020-02-04 10:35:17Z vboxsync $ */
2	/** @file
3	* VirtualBox Support Service - The Grant Service.
4	*/
5
6	/*
7	* Copyright (C) 2008-2020 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	* The contents of this file may alternatively be used under the terms
18	* of the Common Development and Distribution License Version 1.0
19	* (CDDL) only, as it comes in the "COPYING.CDDL" file of the
20	* VirtualBox OSE distribution, in which case the provisions of the
21	* CDDL are applicable instead of those of the GPL.
22	*
23	* You may elect to license modified versions of this file under the
24	* terms and conditions of either the GPL or the CDDL or both.
25	*/
26
27
28	/*********************************************************************************************************************************
29	* Header Files *
30	*********************************************************************************************************************************/
31	#define LOG_GROUP LOG_GROUP_SUP
32	#include "SUPSvcInternal.h"
33
34	#include <VBox/log.h>
35	#include <iprt/asm.h>
36	#include <iprt/errcore.h>
37	#include <iprt/assert.h>
38	#include <iprt/critsect.h>
39	#include <iprt/mem.h>
40	#include <iprt/semaphore.h>
41	#include <iprt/thread.h>
42	#include <iprt/time.h>
43	#include <iprt/localipc.h>
44
45
46	/*********************************************************************************************************************************
47	* Structures and Typedefs *
48	*********************************************************************************************************************************/
49	/** Pointer to a client instance. */
50	typedef struct SUPSVCGRANTSESSION *PSUPSVCGRANTSESSION;
51	/** Pointer to a Grant service instance. */
52	typedef struct SUPSVCGRANT *PSUPSVCGRANT;
53
54
55	/**
56	* Grant service session data.
57	*/
58	typedef struct SUPSVCGRANTSESSION
59	{
60	/** Pointer to the next client in the list. */
61	PSUPSVCGRANTSESSION pNext;
62	/** Pointer to the previous client in the list. */
63	PSUPSVCGRANTSESSION pPrev;
64	/** Pointer to the parent (the service instance). */
65	PSUPSVCGRANT volatile pParent;
66	/** The local ipc client handle. */
67	RTLOCALIPCSESSION volatile hSession;
68	/** Indicate that the thread should terminate ASAP. */
69	bool volatile fTerminate;
70	/** The thread handle. */
71	RTTHREAD hThread;
72
73	} SUPSVCGRANTSESSION;
74
75
76	/**
77	* State grant service machine.
78	*/
79	typedef enum SUPSVCGRANTSTATE
80	{
81	/** The invalid zero entry. */
82	kSupSvcGrantState_Invalid = 0,
83	/** Creating - the thread is being started.
84	* Next: Paused or Butchered. */
85	kSupSvcGrantState_Creating,
86	/** Paused - the thread is blocked on it's user event semaphore.
87	* Next: Resuming, Terminating or Butchered.
88	* Prev: Creating, Pausing */
89	kSupSvcGrantState_Paused,
90	/** Resuming - the thread is being unblocked and ushered into RTLocalIpcServiceListen.
91	* Next: Listen or Butchered.
92	* Prev: Paused */
93	kSupSvcGrantState_Resuming,
94	/** Listen - the thread is in RTLocalIpcServerListen or setting up an incoming session.
95	* Next: Pausing or Butchered.
96	* Prev: Resuming */
97	kSupSvcGrantState_Listen,
98	/** Pausing - Cancelling the listen and dropping any incoming sessions.
99	* Next: Paused or Butchered.
100	* Prev: Listen */
101	kSupSvcGrantState_Pausing,
102	/** Butchered - The thread has quit because something when terribly wrong.
103	* Next: Destroyed
104	* Prev: Any. */
105	kSupSvcGrantState_Butchered,
106	/** Pausing - Cancelling the listen and dropping any incoming sessions.
107	* Next: Destroyed
108	* Prev: Paused */
109	kSupSvcGrantState_Terminating,
110	/** Destroyed - the instance is invalid.
111	* Prev: Butchered or Terminating */
112	kSupSvcGrantState_Destroyed,
113	/** The end of valid state values. */
114	kSupSvcGrantState_End,
115	/** The usual 32-bit blowup hack. */
116	kSupSvcGrantState_32BitHack = 0x7fffffff
117	} SUPSVCGRANTSTATE;
118
119
120	/**
121	* Grant service instance data.
122	*/
123	typedef struct SUPSVCGRANT
124	{
125	/** The local ipc server handle. */
126	RTLOCALIPCSERVER hServer;
127
128	/** Critical section serializing access to the session list, the state,
129	* the response event, the session event, and the thread event. */
130	RTCRITSECT CritSect;
131	/** The service thread will signal this event when it has changed to
132	* the 'paused' or 'running' state. */
133	RTSEMEVENT hResponseEvent;
134	/** Event that's signaled on session termination. */
135	RTSEMEVENT hSessionEvent;
136	/** The handle to the service thread. */
137	RTTHREAD hThread;
138	/** Head of the session list. */
139	PSUPSVCGRANTSESSION volatile pSessionHead;
140	/** The service state. */
141	SUPSVCGRANTSTATE volatile enmState;
142
143	/** Critical section serializing access to the SUPR3HardenedVerify APIs. */
144	RTCRITSECT VerifyCritSect;
145	} SUPSVCGRANT;
146
147
148	/*********************************************************************************************************************************
149	* Internal Functions *
150	*********************************************************************************************************************************/
151	static const char *supSvcGrantStateName(SUPSVCGRANTSTATE enmState);
152
153
154
155
156	/**
157	* Services a client session.
158	*
159	* @returns VINF_SUCCESS.
160	*
161	* @param hThread The thread handle.
162	* @param pvSession Pointer to the session instance data.
163	*/
164	static DECLCALLBACK(int) supSvcGrantSessionThread(RTTHREAD hThread, void *pvSession)
165	{
166	PSUPSVCGRANTSESSION pThis = (PSUPSVCGRANTSESSION)pvSession;
167	RTLOCALIPCSESSION hSession = pThis->hSession;
168	Log(("supSvcGrantSessionThread(%p):\n", pThis));
169
170	/*
171	* Process client requests until it quits or we're cancelled on termination.
172	*/
173	while (!ASMAtomicUoReadBool(&pThis->fTerminate))
174	{
175	RTThreadSleep(1000);
176	/** @todo */
177	}
178
179	/*
180	* Clean up the session.
181	*/
182	PSUPSVCGRANT pParent = ASMAtomicReadPtrT(&pThis->pParent, PSUPSVCGRANT);
183	if (pParent)
184	RTCritSectEnter(&pParent->CritSect);
185	else
186	Log(("supSvcGrantSessionThread(%p): No parent\n", pThis));
187
188	ASMAtomicXchgHandle(&pThis->hSession, NIL_RTLOCALIPCSESSION, &hSession);
189	if (hSession != NIL_RTLOCALIPCSESSION)
190	RTLocalIpcSessionClose(hSession);
191	else
192	Log(("supSvcGrantSessionThread(%p): No session handle\n", pThis));
193
194	if (pParent)
195	{
196	RTSemEventSignal(pParent->hSessionEvent);
197	RTCritSectLeave(&pParent->CritSect);
198	}
199	Log(("supSvcGrantSessionThread(%p): exits\n"));
200	return VINF_SUCCESS;
201	}
202
203
204	/**
205	* Cleans up a session.
206	*
207	* This is called while inside the grant service critical section.
208	*
209	* @param pThis The session to destroy.
210	* @param pParent The parent.
211	*/
212	static void supSvcGrantSessionDestroy(PSUPSVCGRANTSESSION pThis, PSUPSVCGRANT pParent)
213	{
214	/*
215	* Unlink it.
216	*/
217	if (pThis->pNext)
218	{
219	Assert(pThis->pNext->pPrev == pThis);
220	pThis->pNext->pPrev = pThis->pPrev;
221	}
222
223	if (pThis->pPrev)
224	{
225	Assert(pThis->pPrev->pNext == pThis);
226	pThis->pPrev->pNext = pThis->pNext;
227	}
228	else if (pParent->pSessionHead == pThis)
229	pParent->pSessionHead = pThis->pNext;
230
231	/*
232	* Free the resources associated with it.
233	*/
234	pThis->hThread = NIL_RTTHREAD;
235	pThis->pNext = NULL;
236	pThis->pPrev = NULL;
237
238	RTLOCALIPCSESSION hSession;
239	ASMAtomicXchgHandle(&pThis->hSession, NIL_RTLOCALIPCSESSION, &hSession);
240	if (hSession != NIL_RTLOCALIPCSESSION)
241	RTLocalIpcSessionClose(hSession);
242
243	RTMemFree(pThis);
244	}
245
246
247	/**
248	* Cleans up zombie sessions, locked.
249	*
250	* @param pThis Pointer to the grant service instance data.
251	*/
252	static void supSvcGrantCleanUpSessionsLocked(PSUPSVCGRANT pThis)
253	{
254	/*
255	* Iterate until be make it all the way thru the list.
256	*
257	* Only use the thread state as and indicator on whether we can destroy
258	* the session or not.
259	*/
260	PSUPSVCGRANTSESSION pCur;
261	do
262	{
263	for (pCur = pThis->pSessionHead; pCur; pCur = pCur->pNext)
264	{
265	int rc = RTThreadWait(pCur->hThread, 0, NULL);
266	if (RT_SUCCESS(rc))
267	{
268	supSvcGrantSessionDestroy(pCur, pThis);
269	break;
270	}
271
272	Assert(rc == VERR_TIMEOUT);
273	Assert(pCur->hThread != NIL_RTTHREAD);
274	Assert(pCur->pNext != pThis->pSessionHead);
275	}
276	} while (pCur);
277	}
278
279
280	/**
281	* Cleans up zombie sessions.
282	*
283	* @returns VINF_SUCCESS, VBox error code on internal error.
284	*
285	* @param pThis Pointer to the grant service instance data.
286	* @param fOwnCritSect Whether we own the crit sect already. The state is preserved.
287	*/
288	static int supSvcGrantCleanUpSessions(PSUPSVCGRANT pThis, bool fOwnCritSect)
289	{
290	int rc = RTCritSectEnter(&pThis->CritSect);
291	if (RT_FAILURE(rc))
292	{
293	supSvcLogError("supSvcGrantCleanUpSessions: RTCritSectEnter returns %Rrc", rc);
294	return rc;
295	}
296
297	supSvcGrantCleanUpSessionsLocked(pThis);
298
299	RTCritSectLeave(&pThis->CritSect);
300	return VINF_SUCCESS;
301	}
302
303
304	/**
305	* Gets the state name.
306	*
307	* @returns The state name string (read only).
308	* @param enmState The state.
309	*/
310	static const char *supSvcGrantStateName(SUPSVCGRANTSTATE enmState)
311	{
312	switch (enmState)
313	{
314	case kSupSvcGrantState_Invalid: return "Invalid";
315	case kSupSvcGrantState_Creating: return "Creating";
316	case kSupSvcGrantState_Paused: return "Paused";
317	case kSupSvcGrantState_Resuming: return "Resuming";
318	case kSupSvcGrantState_Listen: return "Listen";
319	case kSupSvcGrantState_Pausing: return "Pausing";
320	case kSupSvcGrantState_Butchered: return "Butchered";
321	case kSupSvcGrantState_Terminating: return "Terminating";
322	case kSupSvcGrantState_Destroyed: return "Destroyed";
323	default: return "?Unknown?";
324	}
325	}
326
327
328	/**
329	* Attempts to flip into the butchered state.
330	*
331	* @returns rc.
332	* @param pThis The instance data.
333	* @param fOwnCritSect Whether we own the crit sect already.
334	* @param pszFailed What failed.
335	* @param rc What to return (lazy bird).
336	*/
337	static int supSvcGrantThreadButchered(PSUPSVCGRANT pThis, bool fOwnCritSect, const char *pszFailed, int rc)
338	{
339	int rc2 = VINF_SUCCESS;
340	if (!fOwnCritSect)
341	rc2 = RTCritSectEnter(&pThis->CritSect);
342	if (RT_SUCCESS(rc2))
343	{
344	supSvcLogError("supSvcGrantThread(%s): Butchered; %Rrc: %s",
345	supSvcGrantStateName(pThis->enmState), rc, pszFailed);
346	pThis->enmState = kSupSvcGrantState_Butchered;
347
348	RTCritSectLeave(&pThis->CritSect);
349	}
350	return rc;
351	}
352
353
354	/**
355	* Creates a new session.
356	*
357	* @returns VINF_SUCCESS on success, VBox error code on internal error.
358	*
359	* @param pThis Pointer to the grant service instance data.
360	* @param hSession The client session handle.
361	*/
362	static int supSvcGrantThreadCreateSession(PSUPSVCGRANT pThis, RTLOCALIPCSESSION hSession)
363	{
364	/*
365	* Allocate and initialize a new session instance before entering the critsect.
366	*/
367	PSUPSVCGRANTSESSION pSession = (PSUPSVCGRANTSESSION)RTMemAlloc(sizeof(*pSession));
368	if (!pSession)
369	{
370	supSvcLogError("supSvcGrantThreadListen: failed to allocate session");
371	return VINF_SUCCESS; /* not fatal? */
372	}
373	pSession->pPrev = NULL;
374	pSession->pNext = NULL;
375	pSession->pParent = pThis;
376	pSession->hSession = hSession;
377	pSession->fTerminate = false;
378	pSession->hThread = NIL_RTTHREAD;
379
380	/*
381	* Enter the critsect, check the state, link it and fire off the session thread.
382	*/
383	int rc = RTCritSectEnter(&pThis->CritSect);
384	if (RT_SUCCESS(rc))
385	{
386	/* check the state */
387	SUPSVCGRANTSTATE enmState = pThis->enmState;
388	if (enmState == kSupSvcGrantState_Listen)
389	{
390	/* link it */
391	pSession->pNext = pThis->pSessionHead;
392	if (pThis->pSessionHead)
393	pThis->pSessionHead->pPrev = pSession;
394	pThis->pSessionHead = pSession;
395
396	/* fire up the thread */
397	Log(("supSvcGrantThreadListen: starting session %p\n", pSession));
398	rc = RTThreadCreate(&pSession->hThread, supSvcGrantSessionThread, pSession, 0,
399	RTTHREADTYPE_DEFAULT, RTTHREADFLAGS_WAITABLE, "SESSION");
400	if (RT_SUCCESS(rc))
401	{
402	rc = RTCritSectLeave(&pThis->CritSect);
403	if (RT_FAILURE(rc))
404	return supSvcGrantThreadButchered(pThis, false /* fOwnCritSect */, "RTCritSectLeave", rc);
405
406	/*
407	* Successfully handled the client.
408	*/
409	return VINF_SUCCESS;
410	}
411
412	/* bail out */
413	supSvcLogError("supSvcGrantThreadListen: RTThreadCreate returns %Rrc", rc);
414	}
415	else
416	Log(("supSvcGrantThreadListen: dropping connection, state %s\n", supSvcGrantStateName(enmState)));
417
418	RTCritSectLeave(&pThis->CritSect);
419	rc = VINF_SUCCESS;
420	}
421	else
422	supSvcGrantThreadButchered(pThis, false /* fOwnCritSect */, "RTCritSectEnter", rc);
423	RTLocalIpcSessionClose(hSession);
424	RTMemFree(pSession);
425	return rc;
426	}
427
428
429	/**
430	* Listen for a client session and kicks off the service thread for it.
431	*
432	* @returns VINF_SUCCESS on normal state change, failure if something gets screwed up.
433	*
434	* @param pThis Pointer to the grant service instance data.
435	*/
436	static int supSvcGrantThreadListen(PSUPSVCGRANT pThis)
437	{
438	/*
439	* Wait for a client to connect and create a new session.
440	*/
441	RTLOCALIPCSESSION hClientSession = NIL_RTLOCALIPCSESSION;
442	int rc = RTLocalIpcServerListen(pThis->hServer, &hClientSession);
443	if (RT_FAILURE(rc))
444	{
445	if (rc == VERR_CANCELLED)
446	LogFlow(("supSvcGrantThreadListen: cancelled\n"));
447	else if (rc == VERR_TRY_AGAIN)
448	/* for testing */;
449	else
450	return supSvcGrantThreadButchered(pThis, false /* fOwnCritSect */, "RTLocalIpcServerListen", rc);
451	return VINF_SUCCESS;
452	}
453
454	return supSvcGrantThreadCreateSession(pThis, hClientSession);
455	}
456
457
458	/**
459	* Grant service thread.
460	*
461	* This thread is the one listening for clients and kicks off
462	* the session threads and stuff.
463	*
464	* @returns VINF_SUCCESS on normal exit, VBox error status on failure.
465	* @param hThread The thread handle.
466	* @param pvThis Pointer to the grant service instance data.
467	*/
468	static DECLCALLBACK(int) supSvcGrantThread(RTTHREAD hThread, void *pvThis)
469	{
470	PSUPSVCGRANT pThis = (PSUPSVCGRANT)pvThis;
471
472	/*
473	* The state loop.
474	*/
475	for (;;)
476	{
477	/*
478	* Switch on the current state (requires critsect).
479	*/
480	int rc = RTCritSectEnter(&pThis->CritSect);
481	if (RT_FAILURE(rc))
482	{
483	supSvcLogError("supSvcGrantThread - RTCritSectEnter returns %Rrc", rc);
484	return rc;
485	}
486
487	SUPSVCGRANTSTATE enmState = pThis->enmState;
488	LogFlow(("supSvcGrantThread: switching %s\n", supSvcGrantStateName(enmState)));
489	switch (enmState)
490	{
491	case kSupSvcGrantState_Creating:
492	case kSupSvcGrantState_Pausing:
493	pThis->enmState = kSupSvcGrantState_Paused;
494	rc = RTSemEventSignal(pThis->hResponseEvent);
495	if (RT_FAILURE(rc))
496	return supSvcGrantThreadButchered(pThis, true /* fOwnCritSect*/, "RTSemEventSignal", rc);
497	RT_FALL_THRU();
498
499	case kSupSvcGrantState_Paused:
500	RTCritSectLeave(&pThis->CritSect);
501
502	rc = RTThreadUserWait(hThread, 601000); / wake up once in a while (paranoia) */
503	if (RT_FAILURE(rc) && rc != VERR_TIMEOUT)
504	return supSvcGrantThreadButchered(pThis, false /* fOwnCritSect*/, "RTThreadUserWait", rc);
505	break;
506
507	case kSupSvcGrantState_Resuming:
508	pThis->enmState = kSupSvcGrantState_Listen;
509	rc = RTSemEventSignal(pThis->hResponseEvent);
510	if (RT_FAILURE(rc))
511	return supSvcGrantThreadButchered(pThis, true /* fOwnCritSect*/, "RTSemEventSignal", rc);
512	RT_FALL_THRU();
513
514	case kSupSvcGrantState_Listen:
515	RTCritSectLeave(&pThis->CritSect);
516	rc = supSvcGrantThreadListen(pThis);
517	if (RT_FAILURE(rc))
518	{
519	Log(("supSvcGrantThread: supSvcGrantDoListening returns %Rrc, exiting\n", rc));
520	return rc;
521	}
522	break;
523
524	case kSupSvcGrantState_Terminating:
525	RTCritSectLeave(&pThis->CritSect);
526	Log(("supSvcGrantThread: Done\n"));
527	return VINF_SUCCESS;
528
529	case kSupSvcGrantState_Butchered:
530	default:
531	return supSvcGrantThreadButchered(pThis, true /* fOwnCritSect*/, "Bad state", VERR_INTERNAL_ERROR);
532	}
533
534	/*
535	* Massage the session list between clients and states.
536	*/
537	rc = supSvcGrantCleanUpSessions(pThis, false /* fOwnCritSect */);
538	if (RT_FAILURE(rc))
539	return supSvcGrantThreadButchered(pThis, false /* fOwnCritSect */, "supSvcGrantCleanUpSessions", rc);
540	}
541	}
542
543
544	/**
545	* Waits for the service thread to respond to a state change.
546	*
547	* @returns VINF_SUCCESS on success, VERR_TIMEOUT if it doesn't respond in time, other error code on internal error.
548	*
549	* @param pThis Pointer to the grant service instance data.
550	* @param enmCurState The current state.
551	* @param enmNewState The new state we're waiting for it to enter.
552	*/
553	static int supSvcGrantWait(PSUPSVCGRANT pThis, SUPSVCGRANTSTATE enmCurState, SUPSVCGRANTSTATE enmNewState)
554	{
555	LogFlow(("supSvcGrantWait(,%s,%s): enter\n",
556	supSvcGrantStateName(enmCurState), supSvcGrantStateName(enmNewState)));
557
558	/*
559	* Wait a short while for the response event to be set.
560	*/
561	RTSemEventWait(pThis->hResponseEvent, 1000);
562	int rc = RTCritSectEnter(&pThis->CritSect);
563	if (RT_SUCCESS(rc))
564	{
565	if (pThis->enmState == enmNewState)
566	{
567	RTCritSectLeave(&pThis->CritSect);
568	rc = VINF_SUCCESS;
569	}
570	else if (pThis->enmState == enmCurState)
571	{
572	/*
573	* Wait good while longer.
574	*/
575	RTCritSectLeave(&pThis->CritSect);
576	rc = RTSemEventWait(pThis->hResponseEvent, 591000); / 59 sec */
577	if (RT_SUCCESS(rc) \|\| rc == VERR_TIMEOUT)
578	{
579	rc = RTCritSectEnter(&pThis->CritSect);
580	if (RT_SUCCESS(rc))
581	{
582	/*
583	* Check the state whether we've succeeded.
584	*/
585	SUPSVCGRANTSTATE enmState = pThis->enmState;
586	if (enmState == enmNewState)
587	rc = VINF_SUCCESS;
588	else if (enmState == enmCurState)
589	{
590	supSvcLogError("supSvcGrantWait(,%s,%s) - the thread doesn't respond in a timely manner, failing.",
591	supSvcGrantStateName(enmCurState), supSvcGrantStateName(enmNewState));
592	rc = VERR_TIMEOUT;
593	}
594	else
595	{
596	supSvcLogError("supSvcGrantWait(,%s,%s) - wrong state %s!", supSvcGrantStateName(enmCurState),
597	supSvcGrantStateName(enmNewState), supSvcGrantStateName(enmState));
598	AssertMsgFailed(("%s\n", supSvcGrantStateName(enmState)));
599	rc = VERR_INTERNAL_ERROR;
600	}
601
602	RTCritSectLeave(&pThis->CritSect);
603	}
604	else
605	supSvcLogError("supSvcGrantWait(,%s,%s) - RTCritSectEnter returns %Rrc",
606	supSvcGrantStateName(enmCurState), supSvcGrantStateName(enmNewState));
607	}
608	else
609	supSvcLogError("supSvcGrantWait(,%s,%s) - RTSemEventWait returns %Rrc",
610	supSvcGrantStateName(enmCurState), supSvcGrantStateName(enmNewState));
611	}
612	else
613	{
614	supSvcLogError("supSvcGrantWait(,%s,%s) - wrong state %s!", supSvcGrantStateName(enmCurState),
615	supSvcGrantStateName(enmNewState), supSvcGrantStateName(pThis->enmState));
616	AssertMsgFailed(("%s\n", supSvcGrantStateName(pThis->enmState)));
617	RTCritSectLeave(&pThis->CritSect);
618	rc = VERR_INTERNAL_ERROR;
619	}
620	}
621	else
622	supSvcLogError("supSvcGrantWait(,%s,%s) - RTCritSectEnter returns %Rrc",
623	supSvcGrantStateName(enmCurState), supSvcGrantStateName(enmNewState));
624
625	Log(("supSvcGrantWait(,%s,%s): returns %Rrc\n",
626	supSvcGrantStateName(enmCurState), supSvcGrantStateName(enmNewState), rc));
627	return rc;
628	}
629
630
631	/** @copydoc SUPSVCSERVICE::pfnCreate */
632	DECLCALLBACK(int) supSvcGrantCreate(void **ppvInstance)
633	{
634	LogFlowFuncEnter();
635
636	/*
637	* Allocate and initialize the session data.
638	*/
639	PSUPSVCGRANT pThis = (PSUPSVCGRANT)RTMemAlloc(sizeof(*pThis));
640	if (!pThis)
641	{
642	supSvcLogError("supSvcGrantCreate - no memory");
643	return VERR_NO_MEMORY;
644	}
645	bool fFreeIt = true;
646	pThis->pSessionHead = NULL;
647	pThis->enmState = kSupSvcGrantState_Creating;
648	int rc = RTCritSectInit(&pThis->VerifyCritSect);
649	if (RT_SUCCESS(rc))
650	{
651	rc = RTCritSectInit(&pThis->CritSect);
652	if (RT_SUCCESS(rc))
653	{
654	rc = RTSemEventCreate(&pThis->hResponseEvent);
655	if (RT_SUCCESS(rc))
656	{
657	rc = RTSemEventCreate(&pThis->hSessionEvent);
658	if (RT_SUCCESS(rc))
659	{
660	/*
661	* Create the local IPC instance and then finally fire up the thread.
662	*/
663	rc = RTLocalIpcServerCreate(&pThis->hServer, SUPSVC_GRANT_SERVICE_NAME, RTLOCALIPC_FLAGS_MULTI_SESSION);
664	if (RT_SUCCESS(rc))
665	{
666	rc = RTThreadCreate(&pThis->hThread, supSvcGrantThread, pThis, 0, RTTHREADTYPE_DEFAULT, RTTHREADFLAGS_WAITABLE, "GRANT");
667	if (RT_SUCCESS(rc))
668	{
669	rc = supSvcGrantWait(pThis, kSupSvcGrantState_Creating, kSupSvcGrantState_Paused);
670	if (RT_SUCCESS(rc))
671	{
672	/*
673	* Successfully created the grant service!
674	*/
675	Log(("supSvcGrantCreate: returns VINF_SUCCESS (pThis=%p)\n", pThis));
676	*ppvInstance = pThis;
677	return VINF_SUCCESS;
678	}
679
680	/*
681	* The thread FAILED to start in a timely manner!
682	*/
683	RTCritSectEnter(&pThis->CritSect);
684	pThis->enmState = kSupSvcGrantState_Terminating;
685	RTCritSectLeave(&pThis->CritSect);
686
687	RTThreadUserSignal(pThis->hThread);
688
689	int cTries = 10;
690	int rc2 = RTThreadWait(pThis->hThread, 20000, NULL);
691	if (RT_FAILURE(rc2))
692	{
693	/* poke it a few more times before giving up. */
694	while (--cTries > 0)
695	{
696	RTThreadUserSignal(pThis->hThread);
697	RTLocalIpcServerCancel(pThis->hServer);
698	if (RTThreadWait(pThis->hThread, 1000, NULL) != VERR_TIMEOUT)
699	break;
700	}
701	}
702	fFreeIt = cTries <= 0;
703	}
704	else
705	supSvcLogError("supSvcGrantCreate - RTThreadCreate returns %Rrc", rc);
706	RTLocalIpcServerDestroy(pThis->hServer);
707	pThis->hServer = NIL_RTLOCALIPCSERVER;
708	}
709	else
710	supSvcLogError("supSvcGrantCreate - RTLocalIpcServiceCreate returns %Rrc", rc);
711	RTSemEventDestroy(pThis->hSessionEvent);
712	pThis->hSessionEvent = NIL_RTSEMEVENT;
713	}
714	else
715	supSvcLogError("supSvcGrantCreate - RTSemEventCreate returns %Rrc", rc);
716	RTSemEventDestroy(pThis->hResponseEvent);
717	pThis->hResponseEvent = NIL_RTSEMEVENT;
718	}
719	else
720	supSvcLogError("supSvcGrantCreate - RTSemEventCreate returns %Rrc", rc);
721	RTCritSectDelete(&pThis->CritSect);
722	}
723	else
724	supSvcLogError("supSvcGrantCreate - RTCritSectInit returns %Rrc", rc);
725	RTCritSectDelete(&pThis->VerifyCritSect);
726	}
727	else
728	supSvcLogError("supSvcGrantCreate - RTCritSectInit returns %Rrc", rc);
729	if (fFreeIt)
730	RTMemFree(pThis);
731	Log(("supSvcGrantCreate: returns %Rrc\n", rc));
732	return rc;
733	}
734
735
736	/** @copydoc SUPSVCSERVICE::pfnStart */
737	DECLCALLBACK(void) supSvcGrantStart(void *pvInstance)
738	{
739	PSUPSVCGRANT pThis = (PSUPSVCGRANT)pvInstance;
740
741	/*
742	* Change the state and signal the thread.
743	*/
744	int rc = RTCritSectEnter(&pThis->CritSect);
745	if (RT_SUCCESS(rc))
746	{
747	bool fInCritSect = true;
748	SUPSVCGRANTSTATE enmState = pThis->enmState;
749	if (enmState == kSupSvcGrantState_Paused)
750	{
751	pThis->enmState = kSupSvcGrantState_Resuming;
752	rc = RTThreadUserSignal(pThis->hThread);
753	if (RT_SUCCESS(rc))
754	{
755	/*
756	* Wait for the bugger to respond (no need to bitch here).
757	*/
758	RTCritSectLeave(&pThis->CritSect);
759	supSvcGrantWait(pThis, kSupSvcGrantState_Resuming, kSupSvcGrantState_Listen);
760	fInCritSect = false;
761	}
762	}
763	else
764	supSvcLogError("supSvcGrantStart - Incorrect state %s!", supSvcGrantStateName(enmState));
765	if (fInCritSect)
766	RTCritSectLeave(&pThis->CritSect);
767	}
768	else
769	{
770	supSvcLogError("supSvcGrantStart - RTCritSectEnter returns %Rrc!", rc);
771	AssertRCReturnVoid(rc);
772	}
773	}
774
775
776	/** @copydoc SUPSVCSERVICE::pfnTryStop */
777	DECLCALLBACK(int) supSvcGrantTryStop(void *pvInstance)
778	{
779	PSUPSVCGRANT pThis = (PSUPSVCGRANT)pvInstance;
780
781	/*
782	* Don't give up immediately.
783	*/
784	uint64_t u64StartTS = RTTimeMilliTS();
785	int rc;
786	for (;;)
787	{
788	/*
789	* First check the state to make sure the thing is actually running.
790	* If the critsect is butchered, just pretend success.
791	*/
792	rc = RTCritSectEnter(&pThis->CritSect);
793	if (RT_FAILURE(rc))
794	{
795	supSvcLogError("supSvcGrantTryStop - RTCritSectEnter returns %Rrc", rc);
796	AssertRC(rc);
797	return VINF_SUCCESS;
798	}
799	SUPSVCGRANTSTATE enmState = pThis->enmState;
800	if (enmState != kSupSvcGrantState_Listen)
801	{
802	supSvcLogError("supSvcGrantTryStop - Not running, state: %s", supSvcGrantStateName(enmState));
803	RTCritSectLeave(&pThis->CritSect);
804	return VINF_SUCCESS;
805	}
806
807	/*
808	* If there are no clients, usher the thread into the paused state.
809	*/
810	supSvcGrantCleanUpSessionsLocked(pThis);
811	if (!pThis->pSessionHead)
812	{
813	rc = RTThreadUserReset(pThis->hThread);
814	pThis->enmState = kSupSvcGrantState_Pausing;
815	int rc2 = RTLocalIpcServerCancel(pThis->hServer);
816	int rc3 = RTCritSectLeave(&pThis->CritSect);
817	if (RT_SUCCESS(rc) && RT_SUCCESS(rc2) && RT_SUCCESS(rc3))
818	supSvcGrantWait(pThis, kSupSvcGrantState_Pausing, kSupSvcGrantState_Paused);
819	else
820	{
821	if (RT_FAILURE(rc))
822	supSvcLogError("supSvcGrantTryStop - RTThreadUserReset returns %Rrc", rc);
823	if (RT_FAILURE(rc2))
824	supSvcLogError("supSvcGrantTryStop - RTLocalIpcServerCancel returns %Rrc", rc);
825	if (RT_FAILURE(rc3))
826	supSvcLogError("supSvcGrantTryStop - RTCritSectLeave returns %Rrc", rc);
827	}
828	return VINF_SUCCESS;
829	}
830
831	/*
832	* Check the time limit, otherwise wait for a client event.
833	*/
834	uint64_t u64Elapsed = RTTimeMilliTS() - u64StartTS;
835	if (u64Elapsed >= 601000) / 1 min */
836	{
837	unsigned cSessions = 0;
838	for (PSUPSVCGRANTSESSION pCur = pThis->pSessionHead; pCur; pCur = pCur->pNext)
839	cSessions++;
840	RTCritSectLeave(&pThis->CritSect);
841
842	supSvcLogError("supSvcGrantTryStop - %u active sessions after waiting %u ms", cSessions, (unsigned)u64Elapsed);
843	return VERR_TRY_AGAIN;
844	}
845
846	rc = RTCritSectLeave(&pThis->CritSect);
847	if (RT_FAILURE(rc))
848	{
849	supSvcLogError("supSvcGrantTryStop - RTCritSectLeave returns %Rrc", rc);
850	return VINF_SUCCESS;
851	}
852
853	rc = RTSemEventWait(pThis->hSessionEvent, 60*1000 - u64Elapsed);
854	if (RT_FAILURE(rc) && rc != VERR_TIMEOUT)
855	{
856	supSvcLogError("supSvcGrantTryStop - RTSemEventWait returns %Rrc", rc);
857	return VINF_SUCCESS;
858	}
859	}
860	}
861
862
863	/** @copydoc SUPSVCSERVICE::pfnStopAndDestroy */
864	DECLCALLBACK(void) supSvcGrantStopAndDestroy(void *pvInstance, bool fRunning)
865	{
866	PSUPSVCGRANT pThis = (PSUPSVCGRANT)pvInstance;
867	int rc;
868
869	/*
870	* Attempt to stop the service, cancelling blocked server and client calls.
871	*/
872	RTCritSectEnter(&pThis->CritSect);
873
874	SUPSVCGRANTSTATE enmState = pThis->enmState;
875	AssertMsg(fRunning == (pThis->enmState == kSupSvcGrantState_Listen),
876	("%RTbool %s\n", fRunning, supSvcGrantStateName(enmState)));
877
878	if (enmState == kSupSvcGrantState_Listen)
879	{
880	RTThreadUserReset(pThis->hThread);
881	pThis->enmState = kSupSvcGrantState_Paused;
882	for (PSUPSVCGRANTSESSION pCur = pThis->pSessionHead; pCur; pCur = pCur->pNext)
883	ASMAtomicWriteBool(&pCur->fTerminate, true);
884
885	/* try cancel local ipc operations that might be pending */
886	RTLocalIpcServerCancel(pThis->hServer);
887	for (PSUPSVCGRANTSESSION pCur = pThis->pSessionHead; pCur; pCur = pCur->pNext)
888	{
889	RTLOCALIPCSESSION hSession;
890	ASMAtomicReadHandle(&pCur->hSession, &hSession);
891	if (hSession != NIL_RTLOCALIPCSESSION)
892	RTLocalIpcSessionCancel(hSession);
893	}
894
895	/*
896	* Wait for the thread to respond (outside the crit sect).
897	*/
898	RTCritSectLeave(&pThis->CritSect);
899	supSvcGrantWait(pThis, kSupSvcGrantState_Pausing, kSupSvcGrantState_Paused);
900	RTCritSectEnter(&pThis->CritSect);
901
902	/*
903	* Wait for any lingering sessions to exit.
904	*/
905	supSvcGrantCleanUpSessionsLocked(pThis);
906	if (pThis->pSessionHead)
907	{
908	uint64_t u64StartTS = RTTimeMilliTS();
909	do
910	{
911	/* Destroy the sessions since cancelling didn't do the trick. */
912	for (PSUPSVCGRANTSESSION pCur = pThis->pSessionHead; pCur; pCur = pCur->pNext)
913	{
914	RTLOCALIPCSESSION hSession;
915	ASMAtomicXchgHandle(&pCur->hSession, NIL_RTLOCALIPCSESSION, &hSession);
916	if (hSession != NIL_RTLOCALIPCSESSION)
917	{
918	rc = RTLocalIpcSessionClose(hSession);
919	AssertRC(rc);
920	if (RT_FAILURE(rc))
921	supSvcLogError("supSvcGrantStopAndDestroy: RTLocalIpcSessionClose(%p) returns %Rrc",
922	(uintptr_t)hSession, rc);
923	}
924	}
925
926	/* Check the time. */
927	uint64_t u64Elapsed = RTTimeMilliTS() - u64StartTS;
928	if (u64Elapsed >= 601000) / 1 min */
929	break;
930
931	/* wait */
932	RTCritSectLeave(&pThis->CritSect);
933	rc = RTSemEventWait(pThis->hSessionEvent, 60*1000 - u64Elapsed);
934	RTCritSectEnter(&pThis->CritSect);
935	if (RT_FAILURE(rc) && rc != VERR_TIMEOUT)
936	break;
937
938	/* cleanup and check again */
939	supSvcGrantCleanUpSessionsLocked(pThis);
940	} while (pThis->pSessionHead);
941	}
942	}
943
944	/*
945	* Tell the service thread to terminate and wait for it to do so.
946	*/
947	pThis->enmState = kSupSvcGrantState_Terminating;
948	RTLOCALIPCSERVER hServer;
949	ASMAtomicXchgHandle(&pThis->hServer, NIL_RTLOCALIPCSERVER, &hServer);
950	RTThreadUserSignal(pThis->hThread);
951
952	RTCritSectLeave(&pThis->CritSect);
953
954	rc = RTThreadWait(pThis->hThread, 20*1000, NULL);
955	if (RT_FAILURE(rc) && rc == VERR_TIMEOUT)
956	{
957	RTThreadUserSignal(pThis->hThread);
958	RTLocalIpcServerDestroy(hServer);
959	hServer = NIL_RTLOCALIPCSERVER;
960
961	rc = RTThreadWait(pThis->hThread, 40*1000, NULL);
962	if (RT_FAILURE(rc))
963	supSvcLogError("supSvcGrantStopAndDestroy - RTThreadWait(40 sec) returns %Rrc", rc);
964	}
965	else if (RT_FAILURE(rc))
966	supSvcLogError("supSvcGrantStopAndDestroy - RTThreadWait(20 sec) returns %Rrc", rc);
967	pThis->hThread = NIL_RTTHREAD;
968
969	/*
970	* Kill the parent pointers of any lingering sessions.
971	*/
972	RTCritSectEnter(&pThis->CritSect);
973	pThis->enmState = kSupSvcGrantState_Destroyed;
974
975	supSvcGrantCleanUpSessionsLocked(pThis);
976	unsigned cSessions = 0;
977	for (PSUPSVCGRANTSESSION pCur = pThis->pSessionHead; pCur; pCur = pCur->pNext)
978	ASMAtomicWriteNullPtr(&pCur->pParent);
979
980	RTCritSectLeave(&pThis->CritSect);
981	if (cSessions)
982	supSvcLogError("supSvcGrantStopAndDestroy: %d session failed to terminate!", cSessions);
983
984	/*
985	* Free the resource.
986	*/
987	RTLocalIpcServerDestroy(hServer);
988
989	RTSemEventDestroy(pThis->hResponseEvent);
990	pThis->hResponseEvent = NIL_RTSEMEVENT;
991
992	RTSemEventDestroy(pThis->hSessionEvent);
993	pThis->hSessionEvent = NIL_RTSEMEVENT;
994
995	RTCritSectDelete(&pThis->VerifyCritSect);
996	RTCritSectDelete(&pThis->CritSect);
997
998	RTMemFree(pThis);
999
1000	Log(("supSvcGrantStopAndDestroy: done (rc=%Rrc)\n", rc));
1001	}
1002

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source: vbox/trunk/src/VBox/HostDrivers/Support/SUPSvcGrant.cpp@ 84288

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