DrvHostDVD.cpp@ 56292

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1	/* $Id: DrvHostDVD.cpp 56292 2015-06-09 14:20:46Z vboxsync $ */
2	/** @file
3	* DrvHostDVD - Host DVD block driver.
4	*/
5
6	/*
7	* Copyright (C) 2006-2015 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_DRV_HOST_DVD
23	#define __STDC_LIMIT_MACROS
24	#define __STDC_CONSTANT_MACROS
25
26	#ifdef RT_OS_DARWIN
27	# include <mach/mach.h>
28	# include <Carbon/Carbon.h>
29	# include <IOKit/IOKitLib.h>
30	# include <IOKit/IOCFPlugIn.h>
31	# include <IOKit/scsi/SCSITaskLib.h>
32	# include <IOKit/scsi/SCSICommandOperationCodes.h>
33	# include <IOKit/storage/IOStorageDeviceCharacteristics.h>
34	# include <mach/mach_error.h>
35	# define USE_MEDIA_POLLING
36
37	#elif defined RT_OS_LINUX
38	# include <sys/ioctl.h>
39	# include <linux/version.h>
40	/* All the following crap is apparently not necessary anymore since Linux
41	* version 2.6.29. */
42	# if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 29)
43	/* This is a hack to work around conflicts between these linux kernel headers
44	* and the GLIBC tcpip headers. They have different declarations of the 4
45	* standard byte order functions. */
46	# define _LINUX_BYTEORDER_GENERIC_H
47	/* This is another hack for not bothering with C++ unfriendly byteswap macros. */
48	/* Those macros that are needed are defined in the header below. */
49	# include "swab.h"
50	# endif
51	# include <linux/cdrom.h>
52	# include <sys/fcntl.h>
53	# include <errno.h>
54	# include <limits.h>
55	# include <iprt/mem.h>
56	# define USE_MEDIA_POLLING
57
58	#elif defined(RT_OS_SOLARIS)
59	# include <stropts.h>
60	# include <fcntl.h>
61	# include <errno.h>
62	# include <pwd.h>
63	# include <unistd.h>
64	# include <syslog.h>
65	# ifdef VBOX_WITH_SUID_WRAPPER
66	# include <auth_attr.h>
67	# endif
68	# include <sys/dkio.h>
69	# include <sys/sockio.h>
70	# include <sys/scsi/scsi.h>
71	# define USE_MEDIA_POLLING
72
73	#elif defined(RT_OS_WINDOWS)
74	# pragma warning(disable : 4163)
75	# define _interlockedbittestandset they_messed_it_up_in_winnt_h_this_time_sigh__interlockedbittestandset
76	# define _interlockedbittestandreset they_messed_it_up_in_winnt_h_this_time_sigh__interlockedbittestandreset
77	# define _interlockedbittestandset64 they_messed_it_up_in_winnt_h_this_time_sigh__interlockedbittestandset64
78	# define _interlockedbittestandreset64 they_messed_it_up_in_winnt_h_this_time_sigh__interlockedbittestandreset64
79	# include <Windows.h>
80	# include <winioctl.h>
81	# include <ntddscsi.h>
82	# pragma warning(default : 4163)
83	# undef _interlockedbittestandset
84	# undef _interlockedbittestandreset
85	# undef _interlockedbittestandset64
86	# undef _interlockedbittestandreset64
87	# undef USE_MEDIA_POLLING
88
89	#elif defined(RT_OS_FREEBSD)
90	# include <sys/cdefs.h>
91	# include <sys/param.h>
92	# include <stdio.h>
93	# include <cam/cam.h>
94	# include <cam/cam_ccb.h>
95	# define USE_MEDIA_POLLING
96
97	#else
98	# error "Unsupported Platform."
99	#endif
100
101	#include <iprt/asm.h>
102	#include <VBox/vmm/pdmdrv.h>
103	#include <iprt/asm.h>
104	#include <iprt/assert.h>
105	#include <iprt/file.h>
106	#include <iprt/string.h>
107	#include <iprt/thread.h>
108	#include <iprt/critsect.h>
109	#include <VBox/scsi.h>
110
111	#include "VBoxDD.h"
112	#include "DrvHostBase.h"
113
114
115	/*******************************************************************************
116	* Internal Functions *
117	*******************************************************************************/
118	static DECLCALLBACK(int) drvHostDvdDoLock(PDRVHOSTBASE pThis, bool fLock);
119	#ifdef VBOX_WITH_SUID_WRAPPER
120	static int solarisCheckUserAuth();
121	static int solarisEnterRootMode(uid_t *pEffUserID);
122	static int solarisExitRootMode(uid_t *pEffUserID);
123	#endif
124
125
126	/** @copydoc PDMIMOUNT::pfnUnmount */
127	static DECLCALLBACK(int) drvHostDvdUnmount(PPDMIMOUNT pInterface, bool fForce, bool fEject)
128	{
129	PDRVHOSTBASE pThis = PDMIMOUNT_2_DRVHOSTBASE(pInterface);
130	RTCritSectEnter(&pThis->CritSect);
131
132	/*
133	* Validate state.
134	*/
135	int rc = VINF_SUCCESS;
136	if (!pThis->fLocked \|\| fForce)
137	{
138	/* Unlock drive if necessary. */
139	if (pThis->fLocked)
140	drvHostDvdDoLock(pThis, false);
141
142	if (fEject)
143	{
144	/*
145	* Eject the disc.
146	*/
147	#if defined(RT_OS_DARWIN) \|\| defined(RT_OS_FREEBSD)
148	uint8_t abCmd[16] =
149	{
150	SCSI_START_STOP_UNIT, 0, 0, 0, 2 /eject+stop/, 0,
151	0,0,0,0,0,0,0,0,0,0
152	};
153	rc = DRVHostBaseScsiCmd(pThis, abCmd, 6, PDMBLOCKTXDIR_NONE, NULL, NULL, NULL, 0, 0);
154
155	#elif defined(RT_OS_LINUX)
156	rc = ioctl(RTFileToNative(pThis->hFileDevice), CDROMEJECT, 0);
157	if (rc < 0)
158	{
159	if (errno == EBUSY)
160	rc = VERR_PDM_MEDIA_LOCKED;
161	else if (errno == ENOSYS)
162	rc = VERR_NOT_SUPPORTED;
163	else
164	rc = RTErrConvertFromErrno(errno);
165	}
166
167	#elif defined(RT_OS_SOLARIS)
168	rc = ioctl(RTFileToNative(pThis->hFileRawDevice), DKIOCEJECT, 0);
169	if (rc < 0)
170	{
171	if (errno == EBUSY)
172	rc = VERR_PDM_MEDIA_LOCKED;
173	else if (errno == ENOSYS \|\| errno == ENOTSUP)
174	rc = VERR_NOT_SUPPORTED;
175	else if (errno == ENODEV)
176	rc = VERR_PDM_MEDIA_NOT_MOUNTED;
177	else
178	rc = RTErrConvertFromErrno(errno);
179	}
180
181	#elif defined(RT_OS_WINDOWS)
182	RTFILE hFileDevice = pThis->hFileDevice;
183	if (hFileDevice == NIL_RTFILE) /* obsolete crap */
184	rc = RTFileOpen(&hFileDevice, pThis->pszDeviceOpen, RTFILE_O_READ \| RTFILE_O_OPEN \| RTFILE_O_DENY_NONE);
185	if (RT_SUCCESS(rc))
186	{
187	/* do ioctl */
188	DWORD cbReturned;
189	if (DeviceIoControl((HANDLE)RTFileToNative(hFileDevice), IOCTL_STORAGE_EJECT_MEDIA,
190	NULL, 0,
191	NULL, 0, &cbReturned,
192	NULL))
193	rc = VINF_SUCCESS;
194	else
195	rc = RTErrConvertFromWin32(GetLastError());
196
197	/* clean up handle */
198	if (hFileDevice != pThis->hFileDevice)
199	RTFileClose(hFileDevice);
200	}
201	else
202	AssertMsgFailed(("Failed to open '%s' for ejecting this tray.\n", rc));
203
204
205	#else
206	AssertMsgFailed(("Eject is not implemented!\n"));
207	rc = VINF_SUCCESS;
208	#endif
209	}
210
211	/*
212	* Media is no longer present.
213	*/
214	DRVHostBaseMediaNotPresent(pThis); /** @todo This isn't thread safe! */
215	}
216	else
217	{
218	Log(("drvHostDvdUnmount: Locked\n"));
219	rc = VERR_PDM_MEDIA_LOCKED;
220	}
221
222	RTCritSectLeave(&pThis->CritSect);
223	LogFlow(("drvHostDvdUnmount: returns %Rrc\n", rc));
224	return rc;
225	}
226
227
228	/**
229	* Locks or unlocks the drive.
230	*
231	* @returns VBox status code.
232	* @param pThis The instance data.
233	* @param fLock True if the request is to lock the drive, false if to unlock.
234	*/
235	static DECLCALLBACK(int) drvHostDvdDoLock(PDRVHOSTBASE pThis, bool fLock)
236	{
237	#if defined(RT_OS_DARWIN) \|\| defined(RT_OS_FREEBSD)
238	uint8_t abCmd[16] =
239	{
240	SCSI_PREVENT_ALLOW_MEDIUM_REMOVAL, 0, 0, 0, fLock, 0,
241	0,0,0,0,0,0,0,0,0,0
242	};
243	int rc = DRVHostBaseScsiCmd(pThis, abCmd, 6, PDMBLOCKTXDIR_NONE, NULL, NULL, NULL, 0, 0);
244
245	#elif defined(RT_OS_LINUX)
246	int rc = ioctl(RTFileToNative(pThis->hFileDevice), CDROM_LOCKDOOR, (int)fLock);
247	if (rc < 0)
248	{
249	if (errno == EBUSY)
250	rc = VERR_ACCESS_DENIED;
251	else if (errno == EDRIVE_CANT_DO_THIS)
252	rc = VERR_NOT_SUPPORTED;
253	else
254	rc = RTErrConvertFromErrno(errno);
255	}
256
257	#elif defined(RT_OS_SOLARIS)
258	int rc = ioctl(RTFileToNative(pThis->hFileRawDevice), fLock ? DKIOCLOCK : DKIOCUNLOCK, 0);
259	if (rc < 0)
260	{
261	if (errno == EBUSY)
262	rc = VERR_ACCESS_DENIED;
263	else if (errno == ENOTSUP \|\| errno == ENOSYS)
264	rc = VERR_NOT_SUPPORTED;
265	else
266	rc = RTErrConvertFromErrno(errno);
267	}
268
269	#elif defined(RT_OS_WINDOWS)
270
271	PREVENT_MEDIA_REMOVAL PreventMediaRemoval = {fLock};
272	DWORD cbReturned;
273	int rc;
274	if (DeviceIoControl((HANDLE)RTFileToNative(pThis->hFileDevice), IOCTL_STORAGE_MEDIA_REMOVAL,
275	&PreventMediaRemoval, sizeof(PreventMediaRemoval),
276	NULL, 0, &cbReturned,
277	NULL))
278	rc = VINF_SUCCESS;
279	else
280	/** @todo figure out the return codes for already locked. */
281	rc = RTErrConvertFromWin32(GetLastError());
282
283	#else
284	AssertMsgFailed(("Lock/Unlock is not implemented!\n"));
285	int rc = VINF_SUCCESS;
286
287	#endif
288
289	LogFlow(("drvHostDvdDoLock(, fLock=%RTbool): returns %Rrc\n", fLock, rc));
290	return rc;
291	}
292
293
294
295	#ifdef RT_OS_LINUX
296	/**
297	* Get the media size.
298	*
299	* @returns VBox status code.
300	* @param pThis The instance data.
301	* @param pcb Where to store the size.
302	*/
303	static int drvHostDvdGetMediaSize(PDRVHOSTBASE pThis, uint64_t *pcb)
304	{
305	/*
306	* Query the media size.
307	*/
308	/* Clear the media-changed-since-last-call-thingy just to be on the safe side. */
309	ioctl(RTFileToNative(pThis->hFileDevice), CDROM_MEDIA_CHANGED, CDSL_CURRENT);
310	return RTFileSeek(pThis->hFileDevice, 0, RTFILE_SEEK_END, pcb);
311
312	}
313	#endif /* RT_OS_LINUX */
314
315
316	#ifdef USE_MEDIA_POLLING
317	/**
318	* Do media change polling.
319	*/
320	DECLCALLBACK(int) drvHostDvdPoll(PDRVHOSTBASE pThis)
321	{
322	/*
323	* Poll for media change.
324	*/
325	#if defined(RT_OS_DARWIN) \|\| defined(RT_OS_FREEBSD)
326	#ifdef RT_OS_DARWIN
327	AssertReturn(pThis->ppScsiTaskDI, VERR_INTERNAL_ERROR);
328	#endif
329
330	/*
331	* Issue a TEST UNIT READY request.
332	*/
333	bool fMediaChanged = false;
334	bool fMediaPresent = false;
335	uint8_t abCmd[16] = { SCSI_TEST_UNIT_READY, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0 };
336	uint8_t abSense[32];
337	int rc2 = DRVHostBaseScsiCmd(pThis, abCmd, 6, PDMBLOCKTXDIR_NONE, NULL, NULL, abSense, sizeof(abSense), 0);
338	if (RT_SUCCESS(rc2))
339	fMediaPresent = true;
340	else if ( rc2 == VERR_UNRESOLVED_ERROR
341	&& abSense[2] == 6 /* unit attention */
342	&& ( (abSense[12] == 0x29 && abSense[13] < 5 /* reset */)
343	\|\| (abSense[12] == 0x2a && abSense[13] == 0 /* parameters changed */) //???
344	\|\| (abSense[12] == 0x3f && abSense[13] == 0 /* target operating conditions have changed */) //???
345	\|\| (abSense[12] == 0x3f && abSense[13] == 2 /* changed operating definition */) //???
346	\|\| (abSense[12] == 0x3f && abSense[13] == 3 /* inquiry parameters changed */)
347	\|\| (abSense[12] == 0x3f && abSense[13] == 5 /* device identifier changed */)
348	)
349	)
350	{
351	fMediaPresent = false;
352	fMediaChanged = true;
353	/** @todo check this media change stuff on Darwin. */
354	}
355
356	#elif defined(RT_OS_LINUX)
357	bool fMediaPresent = ioctl(RTFileToNative(pThis->hFileDevice), CDROM_DRIVE_STATUS, CDSL_CURRENT) == CDS_DISC_OK;
358
359	#elif defined(RT_OS_SOLARIS)
360	bool fMediaPresent = false;
361	bool fMediaChanged = false;
362
363	/* Need to pass the previous state and DKIO_NONE for the first time. */
364	static dkio_state s_DeviceState = DKIO_NONE;
365	dkio_state PreviousState = s_DeviceState;
366	int rc2 = ioctl(RTFileToNative(pThis->hFileRawDevice), DKIOCSTATE, &s_DeviceState);
367	if (rc2 == 0)
368	{
369	fMediaPresent = (s_DeviceState == DKIO_INSERTED);
370	if (PreviousState != s_DeviceState)
371	fMediaChanged = true;
372	}
373
374	#else
375	# error "Unsupported platform."
376	#endif
377
378	RTCritSectEnter(&pThis->CritSect);
379
380	int rc = VINF_SUCCESS;
381	if (pThis->fMediaPresent != fMediaPresent)
382	{
383	LogFlow(("drvHostDvdPoll: %d -> %d\n", pThis->fMediaPresent, fMediaPresent));
384	pThis->fMediaPresent = false;
385	if (fMediaPresent)
386	rc = DRVHostBaseMediaPresent(pThis);
387	else
388	DRVHostBaseMediaNotPresent(pThis);
389	}
390	else if (fMediaPresent)
391	{
392	/*
393	* Poll for media change.
394	*/
395	#if defined(RT_OS_DARWIN) \|\| defined(RT_OS_SOLARIS) \|\| defined(RT_OS_FREEBSD)
396	/* taken care of above. */
397	#elif defined(RT_OS_LINUX)
398	bool fMediaChanged = ioctl(RTFileToNative(pThis->hFileDevice), CDROM_MEDIA_CHANGED, CDSL_CURRENT) == 1;
399	#else
400	# error "Unsupported platform."
401	#endif
402	if (fMediaChanged)
403	{
404	LogFlow(("drvHostDVDMediaThread: Media changed!\n"));
405	DRVHostBaseMediaNotPresent(pThis);
406	rc = DRVHostBaseMediaPresent(pThis);
407	}
408	}
409
410	RTCritSectLeave(&pThis->CritSect);
411	return rc;
412	}
413	#endif /* USE_MEDIA_POLLING */
414
415
416	/** @copydoc PDMIBLOCK::pfnSendCmd */
417	static int drvHostDvdSendCmd(PPDMIBLOCK pInterface, const uint8_t *pbCmd,
418	PDMBLOCKTXDIR enmTxDir, void pvBuf, uint32_t pcbBuf,
419	uint8_t *pabSense, size_t cbSense, uint32_t cTimeoutMillies)
420	{
421	PDRVHOSTBASE pThis = PDMIBLOCK_2_DRVHOSTBASE(pInterface);
422	int rc;
423	LogFlow(("%s: cmd[0]=%#04x txdir=%d pcbBuf=%d timeout=%d\n", __FUNCTION__, pbCmd[0], enmTxDir, *pcbBuf, cTimeoutMillies));
424
425	#if defined(RT_OS_DARWIN) \|\| defined(RT_OS_FREEBSD)
426	/*
427	* Pass the request on to the internal scsi command interface.
428	* The command seems to be 12 bytes long, the docs a bit copy&pasty on the command length point...
429	*/
430	if (enmTxDir == PDMBLOCKTXDIR_FROM_DEVICE)
431	memset(pvBuf, '\0', pcbBuf); / we got read size, but zero it anyway. */
432	rc = DRVHostBaseScsiCmd(pThis, pbCmd, 12, PDMBLOCKTXDIR_FROM_DEVICE, pvBuf, pcbBuf, pabSense, cbSense, cTimeoutMillies);
433	if (rc == VERR_UNRESOLVED_ERROR)
434	/* sense information set */
435	rc = VERR_DEV_IO_ERROR;
436
437	#elif defined(RT_OS_LINUX)
438	int direction;
439	struct cdrom_generic_command cgc;
440
441	switch (enmTxDir)
442	{
443	case PDMBLOCKTXDIR_NONE:
444	Assert(*pcbBuf == 0);
445	direction = CGC_DATA_NONE;
446	break;
447	case PDMBLOCKTXDIR_FROM_DEVICE:
448	Assert(*pcbBuf != 0);
449	Assert(*pcbBuf <= SCSI_MAX_BUFFER_SIZE);
450	/* Make sure that the buffer is clear for commands reading
451	* data. The actually received data may be shorter than what
452	* we expect, and due to the unreliable feedback about how much
453	* data the ioctl actually transferred, it's impossible to
454	* prevent that. Returning previous buffer contents may cause
455	* security problems inside the guest OS, if users can issue
456	* commands to the CDROM device. */
457	memset(pThis->pbDoubleBuffer, '\0', *pcbBuf);
458	direction = CGC_DATA_READ;
459	break;
460	case PDMBLOCKTXDIR_TO_DEVICE:
461	Assert(*pcbBuf != 0);
462	Assert(*pcbBuf <= SCSI_MAX_BUFFER_SIZE);
463	memcpy(pThis->pbDoubleBuffer, pvBuf, *pcbBuf);
464	direction = CGC_DATA_WRITE;
465	break;
466	default:
467	AssertMsgFailed(("enmTxDir invalid!\n"));
468	direction = CGC_DATA_NONE;
469	}
470	memset(&cgc, '\0', sizeof(cgc));
471	memcpy(cgc.cmd, pbCmd, CDROM_PACKET_SIZE);
472	cgc.buffer = (unsigned char *)pThis->pbDoubleBuffer;
473	cgc.buflen = *pcbBuf;
474	cgc.stat = 0;
475	Assert(cbSense >= sizeof(struct request_sense));
476	cgc.sense = (struct request_sense *)pabSense;
477	cgc.data_direction = direction;
478	cgc.quiet = false;
479	cgc.timeout = cTimeoutMillies;
480	rc = ioctl(RTFileToNative(pThis->hFileDevice), CDROM_SEND_PACKET, &cgc);
481	if (rc < 0)
482	{
483	if (errno == EBUSY)
484	rc = VERR_PDM_MEDIA_LOCKED;
485	else if (errno == ENOSYS)
486	rc = VERR_NOT_SUPPORTED;
487	else
488	{
489	rc = RTErrConvertFromErrno(errno);
490	if (rc == VERR_ACCESS_DENIED && cgc.sense->sense_key == SCSI_SENSE_NONE)
491	cgc.sense->sense_key = SCSI_SENSE_ILLEGAL_REQUEST;
492	Log2(("%s: error status %d, rc=%Rrc\n", __FUNCTION__, cgc.stat, rc));
493	}
494	}
495	switch (enmTxDir)
496	{
497	case PDMBLOCKTXDIR_FROM_DEVICE:
498	memcpy(pvBuf, pThis->pbDoubleBuffer, *pcbBuf);
499	break;
500	default:
501	;
502	}
503	Log2(("%s: after ioctl: cgc.buflen=%d txlen=%d\n", __FUNCTION__, cgc.buflen, *pcbBuf));
504	/* The value of cgc.buflen does not reliably reflect the actual amount
505	* of data transferred (for packet commands with little data transfer
506	* it's 0). So just assume that everything worked ok. */
507
508	#elif defined(RT_OS_SOLARIS)
509	struct uscsi_cmd usc;
510	union scsi_cdb scdb;
511	memset(&usc, 0, sizeof(struct uscsi_cmd));
512	memset(&scdb, 0, sizeof(scdb));
513
514	switch (enmTxDir)
515	{
516	case PDMBLOCKTXDIR_NONE:
517	Assert(*pcbBuf == 0);
518	usc.uscsi_flags = USCSI_READ;
519	/* nothing to do */
520	break;
521
522	case PDMBLOCKTXDIR_FROM_DEVICE:
523	Assert(*pcbBuf != 0);
524	/* Make sure that the buffer is clear for commands reading
525	* data. The actually received data may be shorter than what
526	* we expect, and due to the unreliable feedback about how much
527	* data the ioctl actually transferred, it's impossible to
528	* prevent that. Returning previous buffer contents may cause
529	* security problems inside the guest OS, if users can issue
530	* commands to the CDROM device. */
531	memset(pvBuf, '\0', *pcbBuf);
532	usc.uscsi_flags = USCSI_READ;
533	break;
534	case PDMBLOCKTXDIR_TO_DEVICE:
535	Assert(*pcbBuf != 0);
536	usc.uscsi_flags = USCSI_WRITE;
537	break;
538	default:
539	AssertMsgFailedReturn(("%d\n", enmTxDir), VERR_INTERNAL_ERROR);
540	}
541	usc.uscsi_flags \|= USCSI_RQENABLE;
542	usc.uscsi_rqbuf = (char *)pabSense;
543	usc.uscsi_rqlen = cbSense;
544	usc.uscsi_cdb = (caddr_t)&scdb;
545	usc.uscsi_cdblen = 12;
546	memcpy (usc.uscsi_cdb, pbCmd, usc.uscsi_cdblen);
547	usc.uscsi_bufaddr = (caddr_t)pvBuf;
548	usc.uscsi_buflen = *pcbBuf;
549	usc.uscsi_timeout = (cTimeoutMillies + 999) / 1000;
550
551	/* We need root privileges for user-SCSI under Solaris. */
552	#ifdef VBOX_WITH_SUID_WRAPPER
553	uid_t effUserID = geteuid();
554	solarisEnterRootMode(&effUserID); /** @todo check return code when this really works. */
555	#endif
556	rc = ioctl(RTFileToNative(pThis->hFileRawDevice), USCSICMD, &usc);
557	#ifdef VBOX_WITH_SUID_WRAPPER
558	solarisExitRootMode(&effUserID);
559	#endif
560	if (rc < 0)
561	{
562	if (errno == EPERM)
563	return VERR_PERMISSION_DENIED;
564	if (usc.uscsi_status)
565	{
566	rc = RTErrConvertFromErrno(errno);
567	Log2(("%s: error status. rc=%Rrc\n", __FUNCTION__, rc));
568	}
569	}
570	Log2(("%s: after ioctl: residual buflen=%d original buflen=%d\n", __FUNCTION__, usc.uscsi_resid, usc.uscsi_buflen));
571
572	#elif defined(RT_OS_WINDOWS)
573	int direction;
574	struct _REQ
575	{
576	SCSI_PASS_THROUGH_DIRECT spt;
577	uint8_t aSense[64];
578	} Req;
579	DWORD cbReturned = 0;
580
581	switch (enmTxDir)
582	{
583	case PDMBLOCKTXDIR_NONE:
584	direction = SCSI_IOCTL_DATA_UNSPECIFIED;
585	break;
586	case PDMBLOCKTXDIR_FROM_DEVICE:
587	Assert(*pcbBuf != 0);
588	/* Make sure that the buffer is clear for commands reading
589	* data. The actually received data may be shorter than what
590	* we expect, and due to the unreliable feedback about how much
591	* data the ioctl actually transferred, it's impossible to
592	* prevent that. Returning previous buffer contents may cause
593	* security problems inside the guest OS, if users can issue
594	* commands to the CDROM device. */
595	memset(pvBuf, '\0', *pcbBuf);
596	direction = SCSI_IOCTL_DATA_IN;
597	break;
598	case PDMBLOCKTXDIR_TO_DEVICE:
599	direction = SCSI_IOCTL_DATA_OUT;
600	break;
601	default:
602	AssertMsgFailed(("enmTxDir invalid!\n"));
603	direction = SCSI_IOCTL_DATA_UNSPECIFIED;
604	}
605	memset(&Req, '\0', sizeof(Req));
606	Req.spt.Length = sizeof(Req.spt);
607	Req.spt.CdbLength = 12;
608	memcpy(Req.spt.Cdb, pbCmd, Req.spt.CdbLength);
609	Req.spt.DataBuffer = pvBuf;
610	Req.spt.DataTransferLength = *pcbBuf;
611	Req.spt.DataIn = direction;
612	Req.spt.TimeOutValue = (cTimeoutMillies + 999) / 1000; /* Convert to seconds */
613	Assert(cbSense <= sizeof(Req.aSense));
614	Req.spt.SenseInfoLength = (UCHAR)RT_MIN(sizeof(Req.aSense), cbSense);
615	Req.spt.SenseInfoOffset = RT_OFFSETOF(struct _REQ, aSense);
616	if (DeviceIoControl((HANDLE)RTFileToNative(pThis->hFileDevice), IOCTL_SCSI_PASS_THROUGH_DIRECT,
617	&Req, sizeof(Req), &Req, sizeof(Req), &cbReturned, NULL))
618	{
619	if (cbReturned > RT_OFFSETOF(struct _REQ, aSense))
620	memcpy(pabSense, Req.aSense, cbSense);
621	else
622	memset(pabSense, '\0', cbSense);
623	/* Windows shares the property of not properly reflecting the actually
624	* transferred data size. See above. Assume that everything worked ok.
625	* Except if there are sense information. */
626	rc = (pabSense[2] & 0x0f) == SCSI_SENSE_NONE
627	? VINF_SUCCESS
628	: VERR_DEV_IO_ERROR;
629	}
630	else
631	rc = RTErrConvertFromWin32(GetLastError());
632	Log2(("%s: scsistatus=%d bytes returned=%d tlength=%d\n", __FUNCTION__, Req.spt.ScsiStatus, cbReturned, Req.spt.DataTransferLength));
633
634	#else
635	# error "Unsupported platform."
636	#endif
637
638	if (pbCmd[0] == SCSI_GET_EVENT_STATUS_NOTIFICATION)
639	{
640	uint8_t pbBuf = (uint8_t)pvBuf;
641	Log2(("Event Status Notification class=%#02x supported classes=%#02x\n", pbBuf[2], pbBuf[3]));
642	if (RT_BE2H_U16((uint16_t)pbBuf) >= 6)
643	Log2((" event %#02x %#02x %#02x %#02x\n", pbBuf[4], pbBuf[5], pbBuf[6], pbBuf[7]));
644	}
645
646	LogFlow(("%s: rc=%Rrc\n", __FUNCTION__, rc));
647	return rc;
648	}
649
650
651	#ifdef VBOX_WITH_SUID_WRAPPER
652	/* These functions would have to go into a separate solaris binary with
653	* the setuid permission set, which would run the user-SCSI ioctl and
654	* return the value. BUT... this might be prohibitively slow.
655	*/
656	# ifdef RT_OS_SOLARIS
657
658	/**
659	* Checks if the current user is authorized using Solaris' role-based access control.
660	* Made as a separate function with so that it need not be invoked each time we need
661	* to gain root access.
662	*
663	* @returns VBox error code.
664	*/
665	static int solarisCheckUserAuth()
666	{
667	/* Uses Solaris' role-based access control (RBAC).*/
668	struct passwd *pPass = getpwuid(getuid());
669	if (pPass == NULL \|\| chkauthattr("solaris.device.cdrw", pPass->pw_name) == 0)
670	return VERR_PERMISSION_DENIED;
671
672	return VINF_SUCCESS;
673	}
674
675
676	/**
677	* Setuid wrapper to gain root access.
678	*
679	* @returns VBox error code.
680	* @param pEffUserID Pointer to effective user ID.
681	*/
682	static int solarisEnterRootMode(uid_t *pEffUserID)
683	{
684	/* Increase privilege if required */
685	if (*pEffUserID != 0)
686	{
687	if (seteuid(0) == 0)
688	{
689	*pEffUserID = 0;
690	return VINF_SUCCESS;
691	}
692	return VERR_PERMISSION_DENIED;
693	}
694	return VINF_SUCCESS;
695	}
696
697
698	/**
699	* Setuid wrapper to relinquish root access.
700	*
701	* @returns VBox error code.
702	* @param pEffUserID Pointer to effective user ID.
703	*/
704	static int solarisExitRootMode(uid_t *pEffUserID)
705	{
706	/* Get back to user mode. */
707	if (*pEffUserID == 0)
708	{
709	uid_t realID = getuid();
710	if (seteuid(realID) == 0)
711	{
712	*pEffUserID = realID;
713	return VINF_SUCCESS;
714	}
715	return VERR_PERMISSION_DENIED;
716	}
717	return VINF_SUCCESS;
718	}
719
720	# endif /* RT_OS_SOLARIS */
721	#endif /* VBOX_WITH_SUID_WRAPPER */
722
723
724	/* -=-=-=-=- driver interface -=-=-=-=- */
725
726
727	/** @copydoc FNPDMDRVDESTRUCT */
728	DECLCALLBACK(void) drvHostDvdDestruct(PPDMDRVINS pDrvIns)
729	{
730	#ifdef RT_OS_LINUX
731	PDRVHOSTBASE pThis = PDMINS_2_DATA(pDrvIns, PDRVHOSTBASE);
732
733	if (pThis->pbDoubleBuffer)
734	{
735	RTMemFree(pThis->pbDoubleBuffer);
736	pThis->pbDoubleBuffer = NULL;
737	}
738	#endif
739	return DRVHostBaseDestruct(pDrvIns);
740	}
741
742
743	/**
744	* Construct a host dvd drive driver instance.
745	*
746	* @copydoc FNPDMDRVCONSTRUCT
747	*/
748	static DECLCALLBACK(int) drvHostDvdConstruct(PPDMDRVINS pDrvIns, PCFGMNODE pCfg, uint32_t fFlags)
749	{
750	PDRVHOSTBASE pThis = PDMINS_2_DATA(pDrvIns, PDRVHOSTBASE);
751	LogFlow(("drvHostDvdConstruct: iInstance=%d\n", pDrvIns->iInstance));
752
753	/*
754	* Init instance data.
755	*/
756	int rc = DRVHostBaseInitData(pDrvIns, pCfg, PDMBLOCKTYPE_DVD);
757	if (RT_SUCCESS(rc))
758	{
759	/*
760	* Validate configuration.
761	*/
762	if (CFGMR3AreValuesValid(pCfg, "Path\0Interval\0Locked\0BIOSVisible\0AttachFailError\0Passthrough\0"))
763	{
764	/*
765	* Override stuff.
766	*/
767	#ifdef RT_OS_LINUX
768	pThis->pbDoubleBuffer = (uint8_t *)RTMemAlloc(SCSI_MAX_BUFFER_SIZE);
769	if (!pThis->pbDoubleBuffer)
770	return VERR_NO_MEMORY;
771	#endif
772
773	bool fPassthrough;
774	rc = CFGMR3QueryBool(pCfg, "Passthrough", &fPassthrough);
775	if (RT_SUCCESS(rc) && fPassthrough)
776	{
777	pThis->IBlock.pfnSendCmd = drvHostDvdSendCmd;
778	/* Passthrough requires opening the device in R/W mode. */
779	pThis->fReadOnlyConfig = false;
780	#ifdef VBOX_WITH_SUID_WRAPPER /* Solaris setuid for Passthrough mode. */
781	rc = solarisCheckUserAuth();
782	if (RT_FAILURE(rc))
783	{
784	Log(("DVD: solarisCheckUserAuth failed. Permission denied!\n"));
785	return rc;
786	}
787	#endif /* VBOX_WITH_SUID_WRAPPER */
788	}
789
790	pThis->IMount.pfnUnmount = drvHostDvdUnmount;
791	pThis->pfnDoLock = drvHostDvdDoLock;
792	#ifdef USE_MEDIA_POLLING
793	if (!fPassthrough)
794	pThis->pfnPoll = drvHostDvdPoll;
795	else
796	pThis->pfnPoll = NULL;
797	#endif
798	#ifdef RT_OS_LINUX
799	pThis->pfnGetMediaSize = drvHostDvdGetMediaSize;
800	#endif
801
802	/*
803	* 2nd init part.
804	*/
805	rc = DRVHostBaseInitFinish(pThis);
806	}
807	else
808	{
809	pThis->fAttachFailError = true;
810	rc = VERR_PDM_DRVINS_UNKNOWN_CFG_VALUES;
811	}
812	}
813	if (RT_FAILURE(rc))
814	{
815	if (!pThis->fAttachFailError)
816	{
817	/* Suppressing the attach failure error must not affect the normal
818	* DRVHostBaseDestruct, so reset this flag below before leaving. */
819	pThis->fKeepInstance = true;
820	rc = VINF_SUCCESS;
821	}
822	DRVHostBaseDestruct(pDrvIns);
823	pThis->fKeepInstance = false;
824	}
825
826	LogFlow(("drvHostDvdConstruct: returns %Rrc\n", rc));
827	return rc;
828	}
829
830
831	/**
832	* Block driver registration record.
833	*/
834	const PDMDRVREG g_DrvHostDVD =
835	{
836	/* u32Version */
837	PDM_DRVREG_VERSION,
838	/* szName */
839	"HostDVD",
840	/* szRCMod */
841	"",
842	/* szR0Mod */
843	"",
844	/* pszDescription */
845	"Host DVD Block Driver.",
846	/* fFlags */
847	PDM_DRVREG_FLAGS_HOST_BITS_DEFAULT,
848	/* fClass. */
849	PDM_DRVREG_CLASS_BLOCK,
850	/* cMaxInstances */
851	~0U,
852	/* cbInstance */
853	sizeof(DRVHOSTBASE),
854	/* pfnConstruct */
855	drvHostDvdConstruct,
856	/* pfnDestruct */
857	drvHostDvdDestruct,
858	/* pfnRelocate */
859	NULL,
860	/* pfnIOCtl */
861	NULL,
862	/* pfnPowerOn */
863	NULL,
864	/* pfnReset */
865	NULL,
866	/* pfnSuspend */
867	NULL,
868	/* pfnResume */
869	NULL,
870	/* pfnAttach */
871	NULL,
872	/* pfnDetach */
873	NULL,
874	/* pfnPowerOff */
875	NULL,
876	/* pfnSoftReset */
877	NULL,
878	/* u32EndVersion */
879	PDM_DRVREG_VERSION
880	};
881

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source: vbox/trunk/src/VBox/Devices/Storage/DrvHostDVD.cpp@ 56292

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