SUPSvcGrant.cpp@ 11836

Last change on this file since 11836 was 11725, checked in by vboxsync, 16 years ago
#3076: Merged in the branch with the alternate driver authentication method. (34468:HEAD)
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1	/* $Id: SUPSvcGrant.cpp 11725 2008-08-27 22:21:47Z vboxsync $ */
2	/** @file
3	* VirtualBox Support Service - The Grant Service.
4	*/
5
6	/*
7	* Copyright (C) 2008 Sun Microsystems, Inc.
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	* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa
27	* Clara, CA 95054 USA or visit http://www.sun.com if you need
28	* additional information or have any questions.
29	*/
30
31	/*******************************************************************************
32	* Header Files *
33	*******************************************************************************/
34	#define LOG_GROUP LOG_GROUP_SUP
35	#include "SUPSvcInternal.h"
36
37	#include <VBox/log.h>
38	#include <iprt/asm.h>
39	#include <iprt/err.h>
40	#include <iprt/assert.h>
41	#include <iprt/critsect.h>
42	#include <iprt/mem.h>
43	#include <iprt/semaphore.h>
44	#include <iprt/thread.h>
45	#include <iprt/time.h>
46	#include <iprt/localipc.h>
47
48
49	/*******************************************************************************
50	* Structures and Typedefs *
51	*******************************************************************************/
52	/** Pointer to a client instance. */
53	typedef struct SUPSVCGRANTSESSION *PSUPSVCGRANTSESSION;
54	/** Pointer to a Grant service instance. */
55	typedef struct SUPSVCGRANT *PSUPSVCGRANT;
56
57
58	/**
59	* Grant service session data.
60	*/
61	typedef struct SUPSVCGRANTSESSION
62	{
63	/** Pointer to the next client in the list. */
64	PSUPSVCGRANTSESSION pNext;
65	/** Pointer to the previous client in the list. */
66	PSUPSVCGRANTSESSION pPrev;
67	/** Pointer to the parent (the service instance). */
68	PSUPSVCGRANT volatile pParent;
69	/** The local ipc client handle. */
70	RTLOCALIPCSESSION volatile hSession;
71	/** Indicate that the thread should terminate ASAP. */
72	bool volatile fTerminate;
73	/** The thread handle. */
74	RTTHREAD hThread;
75
76	} SUPSVCGRANTSESSION;
77
78
79	/**
80	* State grant service machine.
81	*/
82	typedef enum SUPSVCGRANTSTATE
83	{
84	/** The invalid zero entry. */
85	kSupSvcGrantState_Invalid = 0,
86	/** Creating - the thread is being started.
87	* Next: Paused or Butchered. */
88	kSupSvcGrantState_Creating,
89	/** Paused - the thread is blocked on it's user event semaphore.
90	* Next: Resuming, Terminating or Butchered.
91	* Prev: Creating, Pausing */
92	kSupSvcGrantState_Paused,
93	/** Resuming - the thread is being unblocked and ushered into RTLocalIpcServiceListen.
94	* Next: Listen or Butchered.
95	* Prev: Paused */
96	kSupSvcGrantState_Resuming,
97	/** Listen - the thread is in RTLocalIpcServerListen or setting up an incoming session.
98	* Next: Pausing or Butchered.
99	* Prev: Resuming */
100	kSupSvcGrantState_Listen,
101	/** Pausing - Cancelling the listen and dropping any incoming sessions.
102	* Next: Paused or Butchered.
103	* Prev: Listen */
104	kSupSvcGrantState_Pausing,
105	/** Butchered - The thread has quit because something when terribly wrong.
106	* Next: Destroyed
107	* Prev: Any. */
108	kSupSvcGrantState_Butchered,
109	/** Pausing - Cancelling the listen and dropping any incoming sessions.
110	* Next: Destroyed
111	* Prev: Paused */
112	kSupSvcGrantState_Terminating,
113	/** Destroyed - the instance is invalid.
114	* Prev: Butchered or Terminating */
115	kSupSvcGrantState_Destroyed,
116	/** The end of valid state values. */
117	kSupSvcGrantState_End,
118	/** The usual 32-bit blowup hack. */
119	kSupSvcGrantState_32BitHack = 0x7fffffff
120	} SUPSVCGRANTSTATE;
121
122
123	/**
124	* Grant service instance data.
125	*/
126	typedef struct SUPSVCGRANT
127	{
128	/** The local ipc server handle. */
129	RTLOCALIPCSERVER hServer;
130
131	/** Critical section serializing access to the session list, the state,
132	* the response event, the session event, and the thread event. */
133	RTCRITSECT CritSect;
134	/** The service thread will signal this event when it has changed to
135	* the 'paused' or 'running' state. */
136	RTSEMEVENT hResponseEvent;
137	/** Event that's signaled on session termination. */
138	RTSEMEVENT hSessionEvent;
139	/** The handle to the service thread. */
140	RTTHREAD hThread;
141	/** Head of the session list. */
142	PSUPSVCGRANTSESSION volatile pSessionHead;
143	/** The service state. */
144	SUPSVCGRANTSTATE volatile enmState;
145
146	/** Critical section serializing access to the SUPR3HardenedVerify APIs. */
147	RTCRITSECT VerifyCritSect;
148	} SUPSVCGRANT;
149
150
151	/*******************************************************************************
152	* Internal Functions *
153	*******************************************************************************/
154	static const char *supSvcGrantStateName(SUPSVCGRANTSTATE enmState);
155
156
157
158
159	/**
160	* Services a client session.
161	*
162	* @returns VINF_SUCCESS.
163	*
164	* @param hThread The thread handle.
165	* @param pvSession Pointer to the session instance data.
166	*/
167	static DECLCALLBACK(int) supSvcGrantSessionThread(RTTHREAD hThread, void *pvSession)
168	{
169	PSUPSVCGRANTSESSION pThis = (PSUPSVCGRANTSESSION)pvSession;
170	RTLOCALIPCSESSION hSession = pThis->hSession;
171	Log(("supSvcGrantSessionThread(%p):\n", pThis));
172
173	/*
174	* Process client requests untill it quits or we're cancelled on termination.
175	*/
176	while (!ASMAtomicUoReadBool(&pThis->fTerminate))
177	{
178	RTThreadSleep(1000);
179	/** @todo */
180	}
181
182	/*
183	* Clean up the session.
184	*/
185	PSUPSVCGRANT pParent = (PSUPSVCGRANT)ASMAtomicReadPtr((void * volatile *)&pThis->pParent);
186	if (pParent)
187	RTCritSectEnter(&pParent->CritSect);
188	else
189	Log(("supSvcGrantSessionThread(%p): No parent\n", pThis));
190
191	ASMAtomicXchgHandle(&pThis->hSession, NIL_RTLOCALIPCSESSION, &hSession);
192	if (hSession != NIL_RTLOCALIPCSESSION)
193	RTLocalIpcSessionClose(hSession);
194	else
195	Log(("supSvcGrantSessionThread(%p): No session handle\n", pThis));
196
197	if (pParent)
198	{
199	RTSemEventSignal(pParent->hSessionEvent);
200	RTCritSectLeave(&pParent->CritSect);
201	}
202	Log(("supSvcGrantSessionThread(%p): exits\n"));
203	return VINF_SUCCESS;
204	}
205
206
207	/**
208	* Cleans up a session.
209	*
210	* This is called while inside the grant service critical section.
211	*
212	* @param pThis The session to destroy.
213	* @param pParent The parent.
214	*/
215	static void supSvcGrantSessionDestroy(PSUPSVCGRANTSESSION pThis, PSUPSVCGRANT pParent)
216	{
217	/*
218	* Unlink it.
219	*/
220	if (pThis->pNext)
221	{
222	Assert(pThis->pNext->pPrev == pThis);
223	pThis->pNext->pPrev = pThis->pPrev;
224	}
225
226	if (pThis->pPrev)
227	{
228	Assert(pThis->pPrev->pNext == pThis);
229	pThis->pPrev->pNext = pThis->pNext;
230	}
231	else if (pParent->pSessionHead == pThis)
232	pParent->pSessionHead = pThis->pNext;
233
234	/*
235	* Free the resources associated with it.
236	*/
237	pThis->hThread = NIL_RTTHREAD;
238	pThis->pNext = NULL;
239	pThis->pPrev = NULL;
240
241	RTLOCALIPCSESSION hSession;
242	ASMAtomicXchgHandle(&pThis->hSession, NIL_RTLOCALIPCSESSION, &hSession);
243	if (hSession != NIL_RTLOCALIPCSESSION)
244	RTLocalIpcSessionClose(hSession);
245
246	RTMemFree(pThis);
247	}
248
249
250	/**
251	* Cleans up zombie sessions, locked.
252	*
253	* @param pThis Pointer to the grant service instance data.
254	*/
255	static void supSvcGrantCleanUpSessionsLocked(PSUPSVCGRANT pThis)
256	{
257	/*
258	* Iterate untill be make it all the way thru the list.
259	*
260	* Only use the thread state as and indicator on whether we can destroy
261	* the session or not.
262	*/
263	PSUPSVCGRANTSESSION pCur;
264	do
265	{
266	for (pCur = pThis->pSessionHead; pCur; pCur = pCur->pNext)
267	{
268	int rc = RTThreadWait(pCur->hThread, 0, NULL);
269	if (RT_SUCCESS(rc))
270	{
271	supSvcGrantSessionDestroy(pCur, pThis);
272	break;
273	}
274
275	Assert(rc == VERR_TIMEOUT);
276	Assert(pCur->hThread != NIL_RTTHREAD);
277	Assert(pCur->pNext != pThis->pSessionHead);
278	}
279	} while (pCur);
280	}
281
282
283	/**
284	* Cleans up zombie sessions.
285	*
286	* @returns VINF_SUCCESS, VBox error code on internal error.
287	*
288	* @param pThis Pointer to the grant service instance data.
289	* @param fOwnCritSect Whether we own the crit sect already. The state is preserved.
290	*/
291	static int supSvcGrantCleanUpSessions(PSUPSVCGRANT pThis, bool fOwnCritSect)
292	{
293	int rc = RTCritSectEnter(&pThis->CritSect);
294	if (RT_FAILURE(rc))
295	{
296	supSvcLogError("supSvcGrantCleanUpSessions: RTCritSectEnter returns %Rrc", rc);
297	return rc;
298	}
299
300	supSvcGrantCleanUpSessionsLocked(pThis);
301
302	RTCritSectLeave(&pThis->CritSect);
303	return VINF_SUCCESS;
304	}
305
306
307	/**
308	* Gets the state name.
309	*
310	* @returns The state name string (read only).
311	* @param enmState The state.
312	*/
313	static const char *supSvcGrantStateName(SUPSVCGRANTSTATE enmState)
314	{
315	switch (enmState)
316	{
317	case kSupSvcGrantState_Invalid: return "Invalid";
318	case kSupSvcGrantState_Creating: return "Creating";
319	case kSupSvcGrantState_Paused: return "Paused";
320	case kSupSvcGrantState_Resuming: return "Resuming";
321	case kSupSvcGrantState_Listen: return "Listen";
322	case kSupSvcGrantState_Pausing: return "Pausing";
323	case kSupSvcGrantState_Butchered: return "Butchered";
324	case kSupSvcGrantState_Terminating: return "Terminating";
325	case kSupSvcGrantState_Destroyed: return "Destroyed";
326	default: return "?Unknown?";
327	}
328	}
329
330
331	/**
332	* Attempts to flip into the butchered state.
333	*
334	* @returns rc.
335	* @param pThis The instance data.
336	* @param fOwnCritSect Whether we own the crit sect already.
337	* @param pszFailed What failed.
338	* @param rc What to return (lazy bird).
339	*/
340	static int supSvcGrantThreadButchered(PSUPSVCGRANT pThis, bool fOwnCritSect, const char *pszFailed, int rc)
341	{
342	int rc2 = VINF_SUCCESS;
343	if (!fOwnCritSect)
344	rc2 = RTCritSectEnter(&pThis->CritSect);
345	if (RT_SUCCESS(rc2))
346	{
347	supSvcLogError("supSvcGrantThread(%s): Butchered; %Rrc: %s",
348	supSvcGrantStateName(pThis->enmState), rc, pszFailed);
349	pThis->enmState = kSupSvcGrantState_Butchered;
350
351	RTCritSectLeave(&pThis->CritSect);
352	}
353	return rc;
354	}
355
356
357	/**
358	* Creates a new session.
359	*
360	* @returns VINF_SUCCESS on success, VBox error code on internal error.
361	*
362	* @param pThis Pointer to the grant service instance data.
363	* @param hSession The client session handle.
364	*/
365	static int supSvcGrantThreadCreateSession(PSUPSVCGRANT pThis, RTLOCALIPCSESSION hSession)
366	{
367	/*
368	* Allocate and initialize a new session instance before entering the critsect.
369	*/
370	PSUPSVCGRANTSESSION pSession = (PSUPSVCGRANTSESSION)RTMemAlloc(sizeof(*pSession));
371	if (!pSession)
372	{
373	supSvcLogError("supSvcGrantThreadListen: failed to allocate session");
374	return VINF_SUCCESS; /* not fatal? */
375	}
376	pSession->pPrev = NULL;
377	pSession->pNext = NULL;
378	pSession->pParent = pThis;
379	pSession->hSession = hSession;
380	pSession->fTerminate = false;
381	pSession->hThread = NIL_RTTHREAD;
382
383	/*
384	* Enter the critsect, check the state, link it and fire off the session thread.
385	*/
386	int rc = RTCritSectEnter(&pThis->CritSect);
387	if (RT_SUCCESS(rc))
388	{
389	/* check the state */
390	SUPSVCGRANTSTATE enmState = pThis->enmState;
391	if (enmState == kSupSvcGrantState_Listen)
392	{
393	/* link it */
394	pSession->pNext = pThis->pSessionHead;
395	if (pThis->pSessionHead)
396	pThis->pSessionHead->pPrev = pSession;
397	pThis->pSessionHead = pSession;
398
399	/* fire up the thread */
400	Log(("supSvcGrantThreadListen: starting session %p\n", pSession));
401	rc = RTThreadCreate(&pSession->hThread, supSvcGrantSessionThread, pSession, 0,
402	RTTHREADTYPE_DEFAULT, RTTHREADFLAGS_WAITABLE, "SESSION");
403	if (RT_SUCCESS(rc))
404	{
405	rc = RTCritSectLeave(&pThis->CritSect);
406	if (RT_FAILURE(rc))
407	return supSvcGrantThreadButchered(pThis, false /* fOwnCritSect */, "RTCritSectLeave", rc);
408
409	/*
410	* Successfully handled the client.
411	*/
412	return VINF_SUCCESS;
413	}
414
415	/* bail out */
416	supSvcLogError("supSvcGrantThreadListen: RTThreadCreate returns %Rrc", rc);
417	}
418	else
419	Log(("supSvcGrantThreadListen: dropping connection, state %s\n", supSvcGrantStateName(enmState)));
420
421	RTCritSectLeave(&pThis->CritSect);
422	rc = VINF_SUCCESS;
423	}
424	else
425	supSvcGrantThreadButchered(pThis, false /* fOwnCritSect */, "RTCritSectEnter", rc);
426	RTLocalIpcSessionClose(hSession);
427	RTMemFree(pSession);
428	return rc;
429	}
430
431
432	/**
433	* Listen for a client session and kicks off the service thread for it.
434	*
435	* @returns VINF_SUCCESS on normal state change, failure if something gets screwed up.
436	*
437	* @param pThis Pointer to the grant service instance data.
438	*/
439	static int supSvcGrantThreadListen(PSUPSVCGRANT pThis)
440	{
441	/*
442	* Wait for a client to connect and create a new session.
443	*/
444	RTLOCALIPCSESSION hClientSession = NIL_RTLOCALIPCSESSION;
445	int rc = RTLocalIpcServerListen(pThis->hServer, &hClientSession);
446	if (RT_FAILURE(rc))
447	{
448	if (rc == VERR_CANCELLED)
449	LogFlow(("supSvcGrantThreadListen: cancelled\n"));
450	else if (rc == VERR_TRY_AGAIN)
451	/* for testing */;
452	else
453	return supSvcGrantThreadButchered(pThis, false /* fOwnCritSect */, "RTLocalIpcServerListen", rc);
454	return VINF_SUCCESS;
455	}
456
457	return supSvcGrantThreadCreateSession(pThis, hClientSession);
458	}
459
460
461	/**
462	* Grant service thread.
463	*
464	* This thread is the one listening for clients and kicks off
465	* the session threads and stuff.
466	*
467	* @returns VINF_SUCCESS on normal exit, VBox error status on failure.
468	* @param hThread The thread handle.
469	* @param pvThis Pointer to the grant service instance data.
470	*/
471	static DECLCALLBACK(int) supSvcGrantThread(RTTHREAD hThread, void *pvThis)
472	{
473	PSUPSVCGRANT pThis = (PSUPSVCGRANT)pvThis;
474
475	/*
476	* The state loop.
477	*/
478	for (;;)
479	{
480	/*
481	* Switch on the current state (requires critsect).
482	*/
483	int rc = RTCritSectEnter(&pThis->CritSect);
484	if (RT_FAILURE(rc))
485	{
486	supSvcLogError("supSvcGrantThread - RTCritSectEnter returns %Rrc", rc);
487	return rc;
488	}
489
490	SUPSVCGRANTSTATE enmState = pThis->enmState;
491	LogFlow(("supSvcGrantThread: switching %s\n", supSvcGrantStateName(enmState)));
492	switch (enmState)
493	{
494	case kSupSvcGrantState_Creating:
495	case kSupSvcGrantState_Pausing:
496	pThis->enmState = kSupSvcGrantState_Paused;
497	rc = RTSemEventSignal(pThis->hResponseEvent);
498	if (RT_FAILURE(rc))
499	return supSvcGrantThreadButchered(pThis, true /* fOwnCritSect*/, "RTSemEventSignal", rc);
500	/* fall thru */
501
502	case kSupSvcGrantState_Paused:
503	RTCritSectLeave(&pThis->CritSect);
504
505	rc = RTThreadUserWait(hThread, 601000); / wake up once in a while (paranoia) */
506	if (RT_FAILURE(rc) && rc != VERR_TIMEOUT)
507	return supSvcGrantThreadButchered(pThis, false /* fOwnCritSect*/, "RTThreadUserWait", rc);
508	break;
509
510	case kSupSvcGrantState_Resuming:
511	pThis->enmState = kSupSvcGrantState_Listen;
512	rc = RTSemEventSignal(pThis->hResponseEvent);
513	if (RT_FAILURE(rc))
514	return supSvcGrantThreadButchered(pThis, true /* fOwnCritSect*/, "RTSemEventSignal", rc);
515	/* fall thru */
516
517	case kSupSvcGrantState_Listen:
518	RTCritSectLeave(&pThis->CritSect);
519	rc = supSvcGrantThreadListen(pThis);
520	if (RT_FAILURE(rc))
521	{
522	Log(("supSvcGrantThread: supSvcGrantDoListening returns %Rrc, exiting\n", rc));
523	return rc;
524	}
525	break;
526
527	case kSupSvcGrantState_Terminating:
528	RTCritSectLeave(&pThis->CritSect);
529	Log(("supSvcGrantThread: Done\n"));
530	return VINF_SUCCESS;
531
532	case kSupSvcGrantState_Butchered:
533	default:
534	return supSvcGrantThreadButchered(pThis, true /* fOwnCritSect*/, "Bad state", VERR_INTERNAL_ERROR);
535	}
536
537	/*
538	* Massage the session list between clients and states.
539	*/
540	rc = supSvcGrantCleanUpSessions(pThis, false /* fOwnCritSect */);
541	if (RT_FAILURE(rc))
542	return supSvcGrantThreadButchered(pThis, false /* fOwnCritSect */, "supSvcGrantCleanUpSessions", rc);
543	}
544	}
545
546
547	/**
548	* Waits for the service thread to respond to a state change.
549	*
550	* @returns VINF_SUCCESS on success, VERR_TIMEOUT if it doesn't respond in time, other error code on internal error.
551	*
552	* @param pThis Pointer to the grant service instance data.
553	* @param enmCurState The current state.
554	* @param enmNewState The new state we're waiting for it to enter.
555	*/
556	static int supSvcGrantWait(PSUPSVCGRANT pThis, SUPSVCGRANTSTATE enmCurState, SUPSVCGRANTSTATE enmNewState)
557	{
558	LogFlow(("supSvcGrantWait(,%s,%s): enter\n",
559	supSvcGrantStateName(enmCurState), supSvcGrantStateName(enmNewState)));
560
561	/*
562	* Wait a short while for the response event to be set.
563	*/
564	RTSemEventWait(pThis->hResponseEvent, 1000);
565	int rc = RTCritSectEnter(&pThis->CritSect);
566	if (RT_SUCCESS(rc))
567	{
568	if (pThis->enmState == enmNewState)
569	{
570	RTCritSectLeave(&pThis->CritSect);
571	rc = VINF_SUCCESS;
572	}
573	else if (pThis->enmState == enmCurState)
574	{
575	/*
576	* Wait good while longer.
577	*/
578	RTCritSectLeave(&pThis->CritSect);
579	rc = RTSemEventWait(pThis->hResponseEvent, 591000); / 59 sec */
580	if (RT_SUCCESS(rc) \|\| rc == VERR_TIMEOUT)
581	{
582	rc = RTCritSectEnter(&pThis->CritSect);
583	if (RT_SUCCESS(rc))
584	{
585	/*
586	* Check the state whether we've succeeded.
587	*/
588	SUPSVCGRANTSTATE enmState = pThis->enmState;
589	if (enmState == enmNewState)
590	rc = VINF_SUCCESS;
591	else if (enmState == enmCurState)
592	{
593	supSvcLogError("supSvcGrantWait(,%s,%s) - the thread doesn't respond in a timely manner, failing.",
594	supSvcGrantStateName(enmCurState), supSvcGrantStateName(enmNewState));
595	rc = VERR_TIMEOUT;
596	}
597	else
598	{
599	supSvcLogError("supSvcGrantWait(,%s,%s) - wrong state %s!", supSvcGrantStateName(enmCurState),
600	supSvcGrantStateName(enmNewState), supSvcGrantStateName(enmState));
601	AssertMsgFailed(("%s\n", supSvcGrantStateName(enmState)));
602	rc = VERR_INTERNAL_ERROR;
603	}
604
605	RTCritSectLeave(&pThis->CritSect);
606	}
607	else
608	supSvcLogError("supSvcGrantWait(,%s,%s) - RTCritSectEnter returns %Rrc",
609	supSvcGrantStateName(enmCurState), supSvcGrantStateName(enmNewState));
610	}
611	else
612	supSvcLogError("supSvcGrantWait(,%s,%s) - RTSemEventWait returns %Rrc",
613	supSvcGrantStateName(enmCurState), supSvcGrantStateName(enmNewState));
614	}
615	else
616	{
617	supSvcLogError("supSvcGrantWait(,%s,%s) - wrong state %s!", supSvcGrantStateName(enmCurState),
618	supSvcGrantStateName(enmNewState), supSvcGrantStateName(pThis->enmState));
619	AssertMsgFailed(("%s\n", supSvcGrantStateName(pThis->enmState)));
620	RTCritSectLeave(&pThis->CritSect);
621	rc = VERR_INTERNAL_ERROR;
622	}
623	}
624	else
625	supSvcLogError("supSvcGrantWait(,%s,%s) - RTCritSectEnter returns %Rrc",
626	supSvcGrantStateName(enmCurState), supSvcGrantStateName(enmNewState));
627
628	Log(("supSvcGrantWait(,%s,%s): returns %Rrc\n",
629	supSvcGrantStateName(enmCurState), supSvcGrantStateName(enmNewState), rc));
630	return rc;
631	}
632
633
634	/** @copydoc SUPSVCSERVICE::pfnCreate */
635	DECLCALLBACK(int) supSvcGrantCreate(void **ppvInstance)
636	{
637	LogFlowFuncEnter();
638
639	/*
640	* Allocate and initialize the session data.
641	*/
642	PSUPSVCGRANT pThis = (PSUPSVCGRANT)RTMemAlloc(sizeof(*pThis));
643	if (!pThis)
644	{
645	supSvcLogError("supSvcGrantCreate - no memory");
646	return VERR_NO_MEMORY;
647	}
648	bool fFreeIt = true;
649	pThis->pSessionHead = NULL;
650	pThis->enmState = kSupSvcGrantState_Creating;
651	int rc = RTCritSectInit(&pThis->VerifyCritSect);
652	if (RT_SUCCESS(rc))
653	{
654	rc = RTCritSectInit(&pThis->CritSect);
655	if (RT_SUCCESS(rc))
656	{
657	rc = RTSemEventCreate(&pThis->hResponseEvent);
658	if (RT_SUCCESS(rc))
659	{
660	rc = RTSemEventCreate(&pThis->hSessionEvent);
661	if (RT_SUCCESS(rc))
662	{
663	/*
664	* Create the local IPC instance and then finally fire up the thread.
665	*/
666	rc = RTLocalIpcServerCreate(&pThis->hServer, SUPSVC_GRANT_SERVICE_NAME, RTLOCALIPC_FLAGS_MULTI_SESSION);
667	if (RT_SUCCESS(rc))
668	{
669	rc = RTThreadCreate(&pThis->hThread, supSvcGrantThread, pThis, 0, RTTHREADTYPE_DEFAULT, RTTHREADFLAGS_WAITABLE, "GRANT");
670	if (RT_SUCCESS(rc))
671	{
672	rc = supSvcGrantWait(pThis, kSupSvcGrantState_Creating, kSupSvcGrantState_Paused);
673	if (RT_SUCCESS(rc))
674	{
675	/*
676	* Successfully created the grant service!
677	*/
678	Log(("supSvcGrantCreate: returns VINF_SUCCESS (pThis=%p)\n", pThis));
679	*ppvInstance = pThis;
680	return VINF_SUCCESS;
681	}
682
683	/*
684	* The thread FAILED to start in a timely manner!
685	*/
686	RTCritSectEnter(&pThis->CritSect);
687	pThis->enmState = kSupSvcGrantState_Terminating;
688	RTCritSectLeave(&pThis->CritSect);
689
690	RTThreadUserSignal(pThis->hThread);
691
692	int cTries = 10;
693	int rc2 = RTThreadWait(pThis->hThread, 20000, NULL);
694	if (RT_FAILURE(rc2))
695	{
696	/* poke it a few more times before giving up. */
697	while (--cTries > 0)
698	{
699	RTThreadUserSignal(pThis->hThread);
700	RTLocalIpcServerCancel(pThis->hServer);
701	if (RTThreadWait(pThis->hThread, 1000, NULL) != VERR_TIMEOUT)
702	break;
703	}
704	}
705	fFreeIt = cTries <= 0;
706	}
707	else
708	supSvcLogError("supSvcGrantCreate - RTThreadCreate returns %Rrc", rc);
709	RTLocalIpcServerDestroy(pThis->hServer);
710	pThis->hServer = NIL_RTLOCALIPCSERVER;
711	}
712	else
713	supSvcLogError("supSvcGrantCreate - RTLocalIpcServiceCreate returns %Rrc", rc);
714	RTSemEventDestroy(pThis->hSessionEvent);
715	pThis->hSessionEvent = NIL_RTSEMEVENT;
716	}
717	else
718	supSvcLogError("supSvcGrantCreate - RTSemEventCreate returns %Rrc", rc);
719	RTSemEventDestroy(pThis->hResponseEvent);
720	pThis->hResponseEvent = NIL_RTSEMEVENT;
721	}
722	else
723	supSvcLogError("supSvcGrantCreate - RTSemEventCreate returns %Rrc", rc);
724	RTCritSectDelete(&pThis->CritSect);
725	}
726	else
727	supSvcLogError("supSvcGrantCreate - RTCritSectInit returns %Rrc", rc);
728	RTCritSectDelete(&pThis->VerifyCritSect);
729	}
730	else
731	supSvcLogError("supSvcGrantCreate - RTCritSectInit returns %Rrc", rc);
732	if (fFreeIt)
733	RTMemFree(pThis);
734	Log(("supSvcGrantCreate: returns %Rrc\n", rc));
735	return rc;
736	}
737
738
739	/** @copydoc SUPSVCSERVICE::pfnStart */
740	DECLCALLBACK(void) supSvcGrantStart(void *pvInstance)
741	{
742	PSUPSVCGRANT pThis = (PSUPSVCGRANT)pvInstance;
743
744	/*
745	* Change the state and signal the thread.
746	*/
747	int rc = RTCritSectEnter(&pThis->CritSect);
748	if (RT_SUCCESS(rc))
749	{
750	bool fInCritSect = true;
751	SUPSVCGRANTSTATE enmState = pThis->enmState;
752	if (enmState == kSupSvcGrantState_Paused)
753	{
754	pThis->enmState = kSupSvcGrantState_Resuming;
755	rc = RTThreadUserSignal(pThis->hThread);
756	if (RT_SUCCESS(rc))
757	{
758	/*
759	* Wait for the bugger to respond (no need to bitch here).
760	*/
761	RTCritSectLeave(&pThis->CritSect);
762	supSvcGrantWait(pThis, kSupSvcGrantState_Resuming, kSupSvcGrantState_Listen);
763	fInCritSect = false;
764	}
765	}
766	else
767	supSvcLogError("supSvcGrantStart - Incorrect state %s!", supSvcGrantStateName(enmState));
768	if (fInCritSect)
769	RTCritSectLeave(&pThis->CritSect);
770	}
771	else
772	{
773	supSvcLogError("supSvcGrantStart - RTCritSectEnter returns %Rrc!", rc);
774	AssertRCReturnVoid(rc);
775	}
776	}
777
778
779	/** @copydoc SUPSVCSERVICE::pfnTryStop */
780	DECLCALLBACK(int) supSvcGrantTryStop(void *pvInstance)
781	{
782	PSUPSVCGRANT pThis = (PSUPSVCGRANT)pvInstance;
783
784	/*
785	* Don't give up immediately.
786	*/
787	uint64_t u64StartTS = RTTimeMilliTS();
788	int rc;
789	for (;;)
790	{
791	/*
792	* First check the state to make sure the thing is actually running.
793	* If the critsect is butchered, just pretend success.
794	*/
795	rc = RTCritSectEnter(&pThis->CritSect);
796	if (RT_FAILURE(rc))
797	{
798	supSvcLogError("supSvcGrantTryStop - RTCritSectEnter returns %Rrc", rc);
799	AssertRC(rc);
800	return VINF_SUCCESS;
801	}
802	SUPSVCGRANTSTATE enmState = pThis->enmState;
803	if (enmState != kSupSvcGrantState_Listen)
804	{
805	supSvcLogError("supSvcGrantTryStop - Not running, state: %s", supSvcGrantStateName(enmState));
806	RTCritSectLeave(&pThis->CritSect);
807	return VINF_SUCCESS;
808	}
809
810	/*
811	* If there are no clients, usher the thread into the paused state.
812	*/
813	supSvcGrantCleanUpSessionsLocked(pThis);
814	if (!pThis->pSessionHead)
815	{
816	rc = RTThreadUserReset(pThis->hThread);
817	pThis->enmState = kSupSvcGrantState_Pausing;
818	int rc2 = RTLocalIpcServerCancel(pThis->hServer);
819	int rc3 = RTCritSectLeave(&pThis->CritSect);
820	if (RT_SUCCESS(rc) && RT_SUCCESS(rc2) && RT_SUCCESS(rc3))
821	supSvcGrantWait(pThis, kSupSvcGrantState_Pausing, kSupSvcGrantState_Paused);
822	else
823	{
824	if (RT_FAILURE(rc))
825	supSvcLogError("supSvcGrantTryStop - RTThreadUserReset returns %Rrc", rc);
826	if (RT_FAILURE(rc2))
827	supSvcLogError("supSvcGrantTryStop - RTLocalIpcServerCancel returns %Rrc", rc);
828	if (RT_FAILURE(rc3))
829	supSvcLogError("supSvcGrantTryStop - RTCritSectLeave returns %Rrc", rc);
830	}
831	return VINF_SUCCESS;
832	}
833
834	/*
835	* Check the time limit, otherwise wait for a client event.
836	*/
837	uint64_t u64Elapsed = RTTimeMilliTS() - u64StartTS;
838	if (u64Elapsed >= 601000) / 1 min */
839	{
840	unsigned cSessions = 0;
841	for (PSUPSVCGRANTSESSION pCur = pThis->pSessionHead; pCur; pCur = pCur->pNext)
842	cSessions++;
843	RTCritSectLeave(&pThis->CritSect);
844
845	supSvcLogError("supSvcGrantTryStop - %u active sessions after waiting %u ms", cSessions, (unsigned)u64Elapsed);
846	return VERR_TRY_AGAIN;
847	}
848
849	rc = RTCritSectLeave(&pThis->CritSect);
850	if (RT_FAILURE(rc))
851	{
852	supSvcLogError("supSvcGrantTryStop - RTCritSectLeave returns %Rrc", rc);
853	return VINF_SUCCESS;
854	}
855
856	rc = RTSemEventWait(pThis->hSessionEvent, 60*1000 - u64Elapsed);
857	if (RT_FAILURE(rc) && rc != VERR_TIMEOUT)
858	{
859	supSvcLogError("supSvcGrantTryStop - RTSemEventWait returns %Rrc", rc);
860	return VINF_SUCCESS;
861	}
862	}
863	}
864
865
866	/** @copydoc SUPSVCSERVICE::pfnStopAndDestroy */
867	DECLCALLBACK(void) supSvcGrantStopAndDestroy(void *pvInstance, bool fRunning)
868	{
869	PSUPSVCGRANT pThis = (PSUPSVCGRANT)pvInstance;
870	int rc;
871
872	/*
873	* Attempt to stop the service, cancelling blocked server and client calls.
874	*/
875	RTCritSectEnter(&pThis->CritSect);
876
877	SUPSVCGRANTSTATE enmState = pThis->enmState;
878	AssertMsg(fRunning == (pThis->enmState == kSupSvcGrantState_Listen),
879	("%RTbool %s\n", fRunning, supSvcGrantStateName(enmState)));
880
881	if (enmState == kSupSvcGrantState_Listen)
882	{
883	RTThreadUserReset(pThis->hThread);
884	pThis->enmState = kSupSvcGrantState_Paused;
885	for (PSUPSVCGRANTSESSION pCur = pThis->pSessionHead; pCur; pCur = pCur->pNext)
886	ASMAtomicWriteBool(&pCur->fTerminate, true);
887
888	/* try cancel local ipc operations that might be pending */
889	RTLocalIpcServerCancel(pThis->hServer);
890	for (PSUPSVCGRANTSESSION pCur = pThis->pSessionHead; pCur; pCur = pCur->pNext)
891	{
892	RTLOCALIPCSESSION hSession;
893	ASMAtomicReadHandle(&pCur->hSession, &hSession);
894	if (hSession != NIL_RTLOCALIPCSESSION)
895	RTLocalIpcSessionCancel(hSession);
896	}
897
898	/*
899	* Wait for the thread to respond (outside the crit sect).
900	*/
901	RTCritSectLeave(&pThis->CritSect);
902	supSvcGrantWait(pThis, kSupSvcGrantState_Pausing, kSupSvcGrantState_Paused);
903	RTCritSectEnter(&pThis->CritSect);
904
905	/*
906	* Wait for any lingering sessions to exit.
907	*/
908	supSvcGrantCleanUpSessionsLocked(pThis);
909	if (pThis->pSessionHead)
910	{
911	uint64_t u64StartTS = RTTimeMilliTS();
912	do
913	{
914	/* Destroy the sessions since cancelling didn't do the trick. */
915	for (PSUPSVCGRANTSESSION pCur = pThis->pSessionHead; pCur; pCur = pCur->pNext)
916	{
917	RTLOCALIPCSESSION hSession;
918	ASMAtomicXchgHandle(&pCur->hSession, NIL_RTLOCALIPCSESSION, &hSession);
919	if (hSession != NIL_RTLOCALIPCSESSION)
920	{
921	rc = RTLocalIpcSessionClose(hSession);
922	AssertRC(rc);
923	if (RT_FAILURE(rc))
924	supSvcLogError("supSvcGrantStopAndDestroy: RTLocalIpcSessionClose(%p) returns %Rrc",
925	(uintptr_t)hSession, rc);
926	}
927	}
928
929	/* Check the time. */
930	uint64_t u64Elapsed = RTTimeMilliTS() - u64StartTS;
931	if (u64Elapsed >= 601000) / 1 min */
932	break;
933
934	/* wait */
935	RTCritSectLeave(&pThis->CritSect);
936	rc = RTSemEventWait(pThis->hSessionEvent, 60*1000 - u64Elapsed);
937	RTCritSectEnter(&pThis->CritSect);
938	if (RT_FAILURE(rc) && rc != VERR_TIMEOUT)
939	break;
940
941	/* cleanup and check again */
942	supSvcGrantCleanUpSessionsLocked(pThis);
943	} while (pThis->pSessionHead);
944	}
945	}
946
947	/*
948	* Tell the service thread to terminate and wait for it to do so.
949	*/
950	pThis->enmState = kSupSvcGrantState_Terminating;
951	RTLOCALIPCSERVER hServer;
952	ASMAtomicXchgHandle(&pThis->hServer, NIL_RTLOCALIPCSERVER, &hServer);
953	RTThreadUserSignal(pThis->hThread);
954
955	RTCritSectLeave(&pThis->CritSect);
956
957	rc = RTThreadWait(pThis->hThread, 20*1000, NULL);
958	if (RT_FAILURE(rc) && rc == VERR_TIMEOUT)
959	{
960	RTThreadUserSignal(pThis->hThread);
961	RTLocalIpcServerDestroy(hServer);
962	hServer = NIL_RTLOCALIPCSERVER;
963
964	rc = RTThreadWait(pThis->hThread, 40*1000, NULL);
965	if (RT_FAILURE(rc))
966	supSvcLogError("supSvcGrantStopAndDestroy - RTThreadWait(40 sec) returns %Rrc", rc);
967	}
968	else if (RT_FAILURE(rc))
969	supSvcLogError("supSvcGrantStopAndDestroy - RTThreadWait(20 sec) returns %Rrc", rc);
970	pThis->hThread = NIL_RTTHREAD;
971
972	/*
973	* Kill the parent pointers of any lingering sessions.
974	*/
975	RTCritSectEnter(&pThis->CritSect);
976	pThis->enmState = kSupSvcGrantState_Destroyed;
977
978	supSvcGrantCleanUpSessionsLocked(pThis);
979	unsigned cSessions = 0;
980	for (PSUPSVCGRANTSESSION pCur = pThis->pSessionHead; pCur; pCur = pCur->pNext)
981	ASMAtomicWritePtr((void * volatile *)&pCur->pParent, NULL);
982
983	RTCritSectLeave(&pThis->CritSect);
984	if (cSessions)
985	supSvcLogError("supSvcGrantStopAndDestroy: %d session failed to terminate!", cSessions);
986
987	/*
988	* Free the resource.
989	*/
990	RTLocalIpcServerDestroy(hServer);
991
992	RTSemEventDestroy(pThis->hResponseEvent);
993	pThis->hResponseEvent = NIL_RTSEMEVENT;
994
995	RTSemEventDestroy(pThis->hSessionEvent);
996	pThis->hSessionEvent = NIL_RTSEMEVENT;
997
998	RTCritSectDelete(&pThis->VerifyCritSect);
999	RTCritSectDelete(&pThis->CritSect);
1000
1001	RTMemFree(pThis);
1002
1003	Log(("supSvcGrantStopAndDestroy: done (rc=%Rrc)\n", rc));
1004	}
1005

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source: vbox/trunk/src/VBox/HostDrivers/Support/SUPSvcGrant.cpp@ 11836

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