VBoxServiceControl.cpp@ 45091

Last change on this file since 45091 was 45010, checked in by vboxsync, 12 years ago
GuestCtrl: More code for guest session infrastructure handling (untested, work in progress).
Property svn:eol-style set to `native` Property svn:keywords set to `Author Date Id Revision`
File size: 17.3 KB

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1	/* $Id: VBoxServiceControl.cpp 45010 2013-03-12 17:47:56Z vboxsync $ */
2	/** @file
3	* VBoxServiceControl - Host-driven Guest Control.
4	*/
5
6	/*
7	* Copyright (C) 2012-2013 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	#include <iprt/asm.h>
23	#include <iprt/assert.h>
24	#include <iprt/env.h>
25	#include <iprt/file.h>
26	#include <iprt/getopt.h>
27	#include <iprt/mem.h>
28	#include <iprt/path.h>
29	#include <iprt/process.h>
30	#include <iprt/semaphore.h>
31	#include <iprt/thread.h>
32	#include <VBox/VBoxGuestLib.h>
33	#include <VBox/HostServices/GuestControlSvc.h>
34	#include "VBoxServiceInternal.h"
35	#include "VBoxServiceControl.h"
36	#include "VBoxServiceUtils.h"
37
38	using namespace guestControl;
39
40	/*******************************************************************************
41	* Global Variables *
42	*******************************************************************************/
43	/** The control interval (milliseconds). */
44	static uint32_t g_uControlIntervalMS = 0;
45	/** The semaphore we're blocking our main control thread on. */
46	static RTSEMEVENTMULTI g_hControlEvent = NIL_RTSEMEVENTMULTI;
47	/** The VM session ID. Changes whenever the VM is restored or reset. */
48	static uint64_t g_idControlSession;
49	/** The guest control service client ID. */
50	static uint32_t g_uControlSvcClientID = 0;
51	/** How many started guest processes are kept into memory for supplying
52	* information to the host. Default is 256 processes. If 0 is specified,
53	* the maximum number of processes is unlimited. */
54	static uint32_t g_uControlProcsMaxKept = 256;
55	/** List of guest control session threads (VBOXSERVICECTRLSESSIONTHREAD).
56	* A guest session thread represents a forked guest session process
57	* of VBoxService. */
58	RTLISTANCHOR g_lstControlSessionThreads;
59	/** The local session object used for handling all session-related stuff.
60	* When using the legacy guest control protocol (< 2), this session runs
61	* under behalf of the VBoxService main process. On newer protocol versions
62	* each session is a forked version of VBoxService using the appropriate
63	* user credentials for opening a guest session. These forked sessions then
64	* are kept in VBOXSERVICECTRLSESSIONTHREAD structures. */
65	VBOXSERVICECTRLSESSION g_Session;
66
67	/*******************************************************************************
68	* Internal Functions *
69	*******************************************************************************/
70	static int gstcntlHandleSessionOpen(PVBGLR3GUESTCTRLHOSTCTX pHostCtx);
71	static int gstcntlHandleSessionClose(PVBGLR3GUESTCTRLHOSTCTX pHostCtx);
72	static void VBoxServiceControlShutdown(void);
73
74
75	/** @copydoc VBOXSERVICE::pfnPreInit */
76	static DECLCALLBACK(int) VBoxServiceControlPreInit(void)
77	{
78	#ifdef VBOX_WITH_GUEST_PROPS
79	/*
80	* Read the service options from the VM's guest properties.
81	* Note that these options can be overridden by the command line options later.
82	*/
83	uint32_t uGuestPropSvcClientID;
84	int rc = VbglR3GuestPropConnect(&uGuestPropSvcClientID);
85	if (RT_FAILURE(rc))
86	{
87	if (rc == VERR_HGCM_SERVICE_NOT_FOUND) /* Host service is not available. */
88	{
89	VBoxServiceVerbose(0, "Guest property service is not available, skipping\n");
90	rc = VINF_SUCCESS;
91	}
92	else
93	VBoxServiceError("Failed to connect to the guest property service! Error: %Rrc\n", rc);
94	}
95	else
96	{
97	VbglR3GuestPropDisconnect(uGuestPropSvcClientID);
98	}
99
100	if (rc == VERR_NOT_FOUND) /* If a value is not found, don't be sad! */
101	rc = VINF_SUCCESS;
102	return rc;
103	#else
104	/* Nothing to do here yet. */
105	return VINF_SUCCESS;
106	#endif
107	}
108
109
110	/** @copydoc VBOXSERVICE::pfnOption */
111	static DECLCALLBACK(int) VBoxServiceControlOption(const char ppszShort, int argc, char argv, int *pi)
112	{
113	int rc = -1;
114	if (ppszShort)
115	/* no short options */;
116	else if (!strcmp(argv[*pi], "--control-interval"))
117	rc = VBoxServiceArgUInt32(argc, argv, "", pi,
118	&g_uControlIntervalMS, 1, UINT32_MAX - 1);
119	#ifdef DEBUG
120	else if (!strcmp(argv[*pi], "--control-dump-stdout"))
121	{
122	g_Session.uFlags \|= VBOXSERVICECTRLSESSION_FLAG_DUMPSTDOUT;
123	rc = 0; /* Flag this command as parsed. */
124	}
125	else if (!strcmp(argv[*pi], "--control-dump-stderr"))
126	{
127	g_Session.uFlags \|= VBOXSERVICECTRLSESSION_FLAG_DUMPSTDERR;
128	rc = 0; /* Flag this command as parsed. */
129	}
130	#endif
131	return rc;
132	}
133
134
135	/** @copydoc VBOXSERVICE::pfnInit */
136	static DECLCALLBACK(int) VBoxServiceControlInit(void)
137	{
138	/*
139	* If not specified, find the right interval default.
140	* Then create the event sem to block on.
141	*/
142	if (!g_uControlIntervalMS)
143	g_uControlIntervalMS = 1000;
144
145	int rc = RTSemEventMultiCreate(&g_hControlEvent);
146	AssertRCReturn(rc, rc);
147
148	VbglR3GetSessionId(&g_idControlSession);
149	/* The status code is ignored as this information is not available with VBox < 3.2.10. */
150
151	/* Init session object. */
152	rc = GstCntlSessionInit(&g_Session, 0 /* Flags */);
153	if (RT_SUCCESS(rc))
154	rc = VbglR3GuestCtrlConnect(&g_uControlSvcClientID);
155	if (RT_SUCCESS(rc))
156	{
157	VBoxServiceVerbose(3, "Guest control service client ID=%RU32\n",
158	g_uControlSvcClientID);
159
160	/* Init session thread list. */
161	RTListInit(&g_lstControlSessionThreads);
162	}
163	else
164	{
165	/* If the service was not found, we disable this service without
166	causing VBoxService to fail. */
167	if (rc == VERR_HGCM_SERVICE_NOT_FOUND) /* Host service is not available. */
168	{
169	VBoxServiceVerbose(0, "Guest control service is not available\n");
170	rc = VERR_SERVICE_DISABLED;
171	}
172	else
173	VBoxServiceError("Failed to connect to the guest control service! Error: %Rrc\n", rc);
174	RTSemEventMultiDestroy(g_hControlEvent);
175	g_hControlEvent = NIL_RTSEMEVENTMULTI;
176	}
177	return rc;
178	}
179
180
181	/** @copydoc VBOXSERVICE::pfnWorker */
182	DECLCALLBACK(int) VBoxServiceControlWorker(bool volatile *pfShutdown)
183	{
184	/*
185	* Tell the control thread that it can continue
186	* spawning services.
187	*/
188	RTThreadUserSignal(RTThreadSelf());
189	Assert(g_uControlSvcClientID > 0);
190
191	int rc = VINF_SUCCESS;
192
193	/* Allocate a scratch buffer for commands which also send
194	* payload data with them. */
195	uint32_t cbScratchBuf = _64K; /** @todo Make buffer size configurable via guest properties/argv! */
196	AssertReturn(RT_IS_POWER_OF_TWO(cbScratchBuf), VERR_INVALID_PARAMETER);
197	uint8_t pvScratchBuf = (uint8_t)RTMemAlloc(cbScratchBuf);
198	AssertPtrReturn(pvScratchBuf, VERR_NO_MEMORY);
199
200	VBGLR3GUESTCTRLHOSTCTX ctxHost = { g_uControlSvcClientID,
201	1 /* Default protocol version */ };
202	for (;;)
203	{
204	VBoxServiceVerbose(3, "Waiting for host msg ...\n");
205	uint32_t uMsg = 0;
206	uint32_t cParms = 0;
207	rc = VbglR3GuestCtrlMsgWaitFor(g_uControlSvcClientID, &uMsg, &cParms);
208	if (rc == VERR_TOO_MUCH_DATA)
209	{
210	VBoxServiceVerbose(4, "Message requires %ld parameters, but only 2 supplied -- retrying request (no error!)...\n", cParms);
211	rc = VINF_SUCCESS; /* Try to get "real" message in next block below. */
212	}
213	else if (RT_FAILURE(rc))
214	VBoxServiceVerbose(3, "Getting host message failed with %Rrc\n", rc); /* VERR_GEN_IO_FAILURE seems to be normal if ran into timeout. */
215	if (RT_SUCCESS(rc))
216	{
217	VBoxServiceVerbose(3, "Msg=%RU32 (%RU32 parms) retrieved\n", uMsg, cParms);
218
219	/* Set number of parameters for current host context. */
220	ctxHost.uNumParms = cParms;
221
222	/* Check for VM session change. */
223	uint64_t idNewSession = g_idControlSession;
224	int rc2 = VbglR3GetSessionId(&idNewSession);
225	if ( RT_SUCCESS(rc2)
226	&& (idNewSession != g_idControlSession))
227	{
228	VBoxServiceVerbose(1, "The VM session ID changed\n");
229	g_idControlSession = idNewSession;
230
231	/* Close all opened guest sessions -- all context IDs, sessions etc.
232	* are now invalid. */
233	rc2 = GstCntlSessionClose(&g_Session);
234	AssertRC(rc2);
235	}
236
237	switch (uMsg)
238	{
239	case HOST_CANCEL_PENDING_WAITS:
240	VBoxServiceVerbose(1, "We were asked to quit ...\n");
241	break;
242
243	case HOST_SESSION_CREATE:
244	rc = gstcntlHandleSessionOpen(&ctxHost);
245	break;
246
247	case HOST_SESSION_CLOSE:
248	rc = gstcntlHandleSessionClose(&ctxHost);
249	break;
250
251	default:
252	{
253	/*
254	* Protocol v1 did not have support for (dedicated)
255	* guest sessions, so all actions need to be performed
256	* under behalf of VBoxService's main executable.
257	*
258	* The global session object then acts as a host for all
259	* started guest processes which bring all their
260	* credentials with them with the actual execution call.
261	*/
262	if (ctxHost.uProtocol == 1)
263	{
264	rc = GstCntlSessionHandler(&g_Session, uMsg, &ctxHost,
265	pvScratchBuf, cbScratchBuf, pfShutdown);
266	}
267	else
268	{
269	/*
270	* ... on newer protocols handling all other commands is
271	* up to the guest session fork of VBoxService, so just
272	* skip all not wanted messages here.
273	*/
274	VBoxServiceVerbose(3, "Skipping msg=%RU32 ...\n", uMsg);
275	}
276	break;
277	}
278	}
279	}
280
281	/* Do we need to shutdown? */
282	if ( *pfShutdown
283	\|\| (RT_SUCCESS(rc) && uMsg == HOST_CANCEL_PENDING_WAITS))
284	{
285	break;
286	}
287
288	/* Let's sleep for a bit and let others run ... */
289	RTThreadYield();
290	}
291
292	VBoxServiceVerbose(0, "Guest control service stopped\n");
293
294	/* Delete scratch buffer. */
295	if (pvScratchBuf)
296	RTMemFree(pvScratchBuf);
297
298	VBoxServiceVerbose(0, "Guest control worker returned with rc=%Rrc\n", rc);
299	return rc;
300	}
301
302
303	static int gstcntlHandleSessionOpen(PVBGLR3GUESTCTRLHOSTCTX pHostCtx)
304	{
305	AssertPtrReturn(pHostCtx, VERR_INVALID_POINTER);
306
307	VBOXSERVICECTRLSESSIONSTARTUPINFO ssInfo = { 0 };
308	int rc = VbglR3GuestCtrlSessionGetOpen(pHostCtx,
309	&ssInfo.uProtocol,
310	ssInfo.szUser, sizeof(ssInfo.szUser),
311	ssInfo.szPassword, sizeof(ssInfo.szPassword),
312	ssInfo.szDomain, sizeof(ssInfo.szDomain),
313	&ssInfo.uFlags, &ssInfo.uSessionID);
314	if (RT_SUCCESS(rc))
315	{
316	/* The session open call has the protocol version the host
317	* wants to use. So update the current protocol version with the one the
318	* host wants to use in subsequent calls. */
319	pHostCtx->uProtocol = ssInfo.uProtocol;
320	VBoxServiceVerbose(3, "Client ID=%RU32 now is using protocol %RU32\n",
321	pHostCtx->uClientID, pHostCtx->uProtocol);
322
323	rc = GstCntlSessionThreadOpen(&g_lstControlSessionThreads,
324	&ssInfo, NULL /* Session */);
325	}
326
327	if (RT_FAILURE(rc))
328	{
329	/* Report back on failure. On success this will be done
330	* by the forked session thread. */
331	int rc2 = VbglR3GuestCtrlSessionNotify(pHostCtx->uClientID, pHostCtx->uContextID,
332	GUEST_SESSION_NOTIFYTYPE_ERROR, rc /* uint32_t vs. int */);
333	if (RT_FAILURE(rc2))
334	{
335	VBoxServiceError("Reporting session error status on open failed with rc=%Rrc\n", rc2);
336	rc = rc2;
337	}
338	}
339
340	VBoxServiceVerbose(3, "Opening a new guest session returned rc=%Rrc\n", rc);
341	return rc;
342	}
343
344
345	static int gstcntlHandleSessionClose(PVBGLR3GUESTCTRLHOSTCTX pHostCtx)
346	{
347	AssertPtrReturn(pHostCtx, VERR_INVALID_POINTER);
348
349	uint32_t uSessionID, uFlags;
350
351	int rc = VbglR3GuestCtrlSessionGetClose(pHostCtx, &uFlags, &uSessionID);
352	if (RT_SUCCESS(rc))
353	{
354	rc = VERR_NOT_FOUND;
355
356	PVBOXSERVICECTRLSESSIONTHREAD pThread;
357	RTListForEach(&g_lstControlSessionThreads, pThread, VBOXSERVICECTRLSESSIONTHREAD, Node)
358	{
359	if (pThread->StartupInfo.uSessionID == uSessionID)
360	{
361	rc = GstCntlSessionThreadClose(pThread, uFlags);
362	break;
363	}
364	}
365
366	if (RT_FAILURE(rc))
367	{
368	/* Report back on failure. On success this will be done
369	* by the forked session thread. */
370	int rc2 = VbglR3GuestCtrlSessionNotify(pHostCtx->uClientID, pHostCtx->uContextID,
371	GUEST_SESSION_NOTIFYTYPE_ERROR, rc);
372	if (RT_FAILURE(rc2))
373	{
374	VBoxServiceError("Reporting session error status on close failed with rc=%Rrc\n", rc2);
375	if (RT_SUCCESS(rc))
376	rc = rc2;
377	}
378	}
379	}
380
381	VBoxServiceVerbose(2, "Closing guest session %RU32 returned rc=%Rrc\n",
382	uSessionID, rc);
383	return rc;
384	}
385
386
387	/** @copydoc VBOXSERVICE::pfnStop */
388	static DECLCALLBACK(void) VBoxServiceControlStop(void)
389	{
390	VBoxServiceVerbose(3, "Stopping ...\n");
391
392	/** @todo Later, figure what to do if we're in RTProcWait(). It's a very
393	* annoying call since doesn't support timeouts in the posix world. */
394	if (g_hControlEvent != NIL_RTSEMEVENTMULTI)
395	RTSemEventMultiSignal(g_hControlEvent);
396
397	/*
398	* Ask the host service to cancel all pending requests so that we can
399	* shutdown properly here.
400	*/
401	if (g_uControlSvcClientID)
402	{
403	VBoxServiceVerbose(3, "Cancelling pending waits (client ID=%u) ...\n",
404	g_uControlSvcClientID);
405
406	int rc = VbglR3GuestCtrlCancelPendingWaits(g_uControlSvcClientID);
407	if (RT_FAILURE(rc))
408	VBoxServiceError("Cancelling pending waits failed; rc=%Rrc\n", rc);
409	}
410	}
411
412
413	/**
414	* Destroys all guest process threads which are still active.
415	*/
416	static void VBoxServiceControlShutdown(void)
417	{
418	VBoxServiceVerbose(2, "Shutting down ...\n");
419
420	int rc2 = GstCntlSessionThreadCloseAll(&g_lstControlSessionThreads,
421	0 /* Flags */);
422	if (RT_FAILURE(rc2))
423	VBoxServiceError("Closing session threads failed with rc=%Rrc\n", rc2);
424
425	rc2 = GstCntlSessionClose(&g_Session);
426	if (RT_FAILURE(rc2))
427	VBoxServiceError("Closing session failed with rc=%Rrc\n", rc2);
428
429	VBoxServiceVerbose(2, "Shutting down complete\n");
430	}
431
432
433	/** @copydoc VBOXSERVICE::pfnTerm */
434	static DECLCALLBACK(void) VBoxServiceControlTerm(void)
435	{
436	VBoxServiceVerbose(3, "Terminating ...\n");
437
438	VBoxServiceControlShutdown();
439
440	VBoxServiceVerbose(3, "Disconnecting client ID=%u ...\n",
441	g_uControlSvcClientID);
442	VbglR3GuestCtrlDisconnect(g_uControlSvcClientID);
443	g_uControlSvcClientID = 0;
444
445	if (g_hControlEvent != NIL_RTSEMEVENTMULTI)
446	{
447	RTSemEventMultiDestroy(g_hControlEvent);
448	g_hControlEvent = NIL_RTSEMEVENTMULTI;
449	}
450	}
451
452
453	/**
454	* The 'vminfo' service description.
455	*/
456	VBOXSERVICE g_Control =
457	{
458	/* pszName. */
459	"control",
460	/* pszDescription. */
461	"Host-driven Guest Control",
462	/* pszUsage. */
463	#ifdef DEBUG
464	" [--control-dump-stderr] [--control-dump-stdout]\n"
465	#endif
466	" [--control-interval <ms>]\n"
467	" [--control-procs-mem-std[in\|out\|err] <KB>]"
468	,
469	/* pszOptions. */
470	#ifdef DEBUG
471	" --control-dump-stderr Dumps all guest proccesses stderr data to the\n"
472	" temporary directory.\n"
473	" --control-dump-stdout Dumps all guest proccesses stdout data to the\n"
474	" temporary directory.\n"
475	#endif
476	" --control-interval Specifies the interval at which to check for\n"
477	" new control commands. The default is 1000 ms.\n"
478	,
479	/* methods */
480	VBoxServiceControlPreInit,
481	VBoxServiceControlOption,
482	VBoxServiceControlInit,
483	VBoxServiceControlWorker,
484	VBoxServiceControlStop,
485	VBoxServiceControlTerm
486	};
487

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source: vbox/trunk/src/VBox/Additions/common/VBoxService/VBoxServiceControl.cpp@ 45091

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