vboximg-mount.cpp@ 78387

Last change on this file since 78387 was 77143, checked in by vboxsync, 6 years ago
Fixed a dyslexia-like transposition of words (but don't have dyslexia).
Property svn:eol-style set to `native` Property svn:keywords set to `Author Date Id Revision`
File size: 57.1 KB

Line
1	/* $Id: vboximg-mount.cpp 77143 2019-02-02 00:22:10Z vboxsync $ */
2	/** @file
3	* vboximg-mount - Disk Image Flattening FUSE Program.
4	*/
5
6	/*
7	* Copyright (C) 2009-2019 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
23	#define LOG_GROUP LOG_GROUP_DEFAULT /** @todo log group */
24
25	#define FUSE_USE_VERSION 27
26	#if defined(RT_OS_DARWIN) \|\| defined(RT_OS_LINUX) \|\| defined(RT_OS_FEEBSD)
27	# define UNIX_DERIVATIVE
28	#endif
29	#define MAX_READERS (INT32_MAX / 32)
30	#include <fuse.h>
31	#ifdef UNIX_DERIVATIVE
32	#include <errno.h>
33	#include <fcntl.h>
34	#include <stdlib.h>
35	#include <libgen.h>
36	#include <unistd.h>
37	#include <math.h>
38	#include <cstdarg>
39	#include <sys/stat.h>
40	#endif
41	#if defined(RT_OS_DARWIN) \|\| defined(RT_OS_FREEBSD) \|\| defined(RT_OS_LINUX)
42	# include <sys/param.h>
43	# undef PVM /* Blasted old BSD mess still hanging around darwin. */
44	#endif
45	#ifdef RT_OS_LINUX
46	# include <linux/fs.h>
47	# include <linux/hdreg.h>
48	#endif
49	#include <VirtualBox_XPCOM.h>
50	#include <VBox/com/VirtualBox.h>
51	#include <VBox/vd.h>
52	#include <VBox/vd-ifs.h>
53	#include <VBox/log.h>
54	#include <VBox/err.h>
55	#include <VBox/com/ErrorInfo.h>
56	#include <VBox/com/NativeEventQueue.h>
57	#include <VBox/com/com.h>
58	#include <VBox/com/string.h>
59	#include <VBox/com/Guid.h>
60	#include <VBox/com/array.h>
61	#include <VBox/com/errorprint.h>
62	#include <VBox/vd-plugin.h>
63	#include <iprt/initterm.h>
64	#include <iprt/assert.h>
65	#include <iprt/message.h>
66	#include <iprt/critsect.h>
67	#include <iprt/asm.h>
68	#include <iprt/mem.h>
69	#include <iprt/string.h>
70	#include <iprt/initterm.h>
71	#include <iprt/stream.h>
72	#include <iprt/types.h>
73	#include <iprt/path.h>
74	#include <iprt/utf16.h>
75	#include <iprt/base64.h>
76
77	#include "vboximg-mount.h"
78	#include "vboximgCrypto.h"
79	#include "vboximgMedia.h"
80	#include "SelfSizingTable.h"
81	#include "vboximgOpts.h"
82
83	using namespace com;
84
85	enum {
86	USAGE_FLAG,
87	};
88
89	enum { PARTITION_TABLE_MBR = 1, PARTITION_TABLE_GPT = 2 };
90
91	#define VBOX_EXTPACK "Oracle VM VirtualBox Extension Pack"
92	#define GPT_PTABLE_SIZE 32 * BLOCKSIZE /** Max size we to read for GPT partition table */
93	#define MBR_PARTITIONS_MAX 4 /** Fixed number of partitions in Master Boot Record */
94	#define BASENAME_MAX 256 /** Maximum name for the basename of a path (for RTStrNLen()*/
95	#define VBOXIMG_PARTITION_MAX 256 /** How much storage to allocate to store partition info */
96	#define PARTITION_NAME_MAX 72 /** Maximum partition name size (accomodates GPT partition name) */
97	#define BLOCKSIZE 512 /** Commonly used disk block size */
98	#define DOS_BOOT_RECORD_SIGNATURE 0xaa55 /** MBR and EBR (partition table) signature [EOT boundary] */
99	#define NULL_BOOT_RECORD_SIGNATURE 0x0000 /** MBR or EBR null signature value */
100	#define MAX_UUID_LEN 256 /** Max length of a UUID */
101	#define LBA(n) (n * BLOCKSIZE)
102	#define VD_SECTOR_SIZE 512 /** Virtual disk sector/blocksize */
103	#define VD_SECTOR_MASK (VD_SECTOR_SIZE - 1) /** Masks off a blocks worth of data */
104	#define VD_SECTOR_OUT_OF_BOUNDS_MASK (~UINT64_C(VD_SECTOR_MASK)) /** Masks the overflow of a blocks worth of data */
105	#define VERBOSE g_vboximgOpts.fVerbose
106	#define IS_BIG_ENDIAN ((uint16_t )"\0\xff" < 0x100)
107
108	#define PARTTYPE_IS_NULL(parType) ((uint8_t)parType == 0x00)
109	#define PARTTYPE_IS_GPT(parType) ((uint8_t)parType == 0xee)
110	#define PARTTYPE_IS_EXT(parType) (( (uint8_t)parType) == 0x05 /* Extended */ \
111	\|\| ((uint8_t)parType) == 0x0f /* W95 Extended (LBA) */ \
112	\|\| ((uint8_t)parType) == 0x85) /* Linux Extended */
113
114	#define SAFENULL(strPtr) (strPtr ? strPtr : "")
115	#define CSTR(arg) Utf8Str(arg).c_str() /* Converts XPCOM string type to C string type */
116
117	static struct fuse_operations g_vboximgOps; /** FUSE structure that defines allowed ops for this FS */
118
119	/* Global variables */
120
121	static PVDISK g_pVDisk; /** Handle for Virtual Disk in contet */
122	static char g_pszDiskUuid; /* UUID of image (if known, otherwise NULL) */
123	static off_t g_vDiskOffset; /** Biases r/w from start of VD */
124	static off_t g_vDiskSize; /** Limits r/w length for VD */
125	static int32_t g_cReaders; /** Number of readers for VD */
126	static int32_t g_cWriters; /** Number of writers for VD */
127	static RTFOFF g_cbEntireVDisk; /** Size of VD */
128	static PVDINTERFACE g_pVdIfs; /** @todo Remove when VD I/O becomes threadsafe */
129	static VDINTERFACETHREADSYNC g_VDIfThreadSync; /** @todo Remove when VD I/O becomes threadsafe */
130	static RTCRITSECT g_vdioLock; /** @todo Remove when VD I/O becomes threadsafe */
131	static uint16_t g_lastPartNbr; /** Last partition number found in MBR + EBR chain */
132	static bool g_fGPT; /** True if GPT type partition table was found */
133	static char g_pszImageName; /* Base filename for current VD image */
134	static char g_pszImagePath; /* Full path to current VD image */
135	static char g_pszBaseImagePath; /* Base image known after parsing */
136	static char g_pszBaseImageName; /* Base image known after parsing */
137	static uint32_t g_cImages; /** Number of images in diff chain */
138
139	/* Table entry containing partition info parsed out of GPT or MBR and EBR chain of specified VD */
140
141	typedef struct
142	{
143	int idxPartition; /** partition number */
144	char *pszName;
145	off_t offPartition; /** partition offset from start of disk, in bytes */
146	uint64_t cbPartition; /** partition size in bytes */
147	uint8_t fBootable; /** partition bootable */
148	union
149	{
150	uint8_t legacy; /** partition type MBR/EBR */
151	uint128_t gptGuidTypeSpecifier; /** partition type GPT */
152	} partitionType; /** uint8_t for MBR/EBR (legacy) and GUID for GPT */
153	union
154	{
155	MBRPARTITIONENTRY mbrEntry; /** MBR (also EBR partition entry) */
156	GPTPARTITIONENTRY gptEntry; /** GPT partition entry */
157	} partitionEntry;
158	} PARTITIONINFO;
159
160	PARTITIONINFO g_aParsedPartitionInfo[VBOXIMG_PARTITION_MAX + 1]; /* Note: Element 0 reserved for EntireDisk partitionEntry */
161
162	VBOXIMGOPTS g_vboximgOpts;
163
164	#define OPTION(fmt, pos, val) { fmt, offsetof(struct vboximgOpts, pos), val }
165
166	static struct fuse_opt vboximgOptDefs[] = {
167	OPTION("--image %s", pszImageUuidOrPath, 0),
168	OPTION("-i %s", pszImageUuidOrPath, 0),
169	OPTION("--rw", fRW, 1),
170	OPTION("--root", fAllowRoot, 0),
171	OPTION("--vm %s", pszVm, 0),
172	OPTION("--partition %d", idxPartition, 1),
173	OPTION("-p %d", idxPartition, 1),
174	OPTION("--offset %d", offset, 1),
175	OPTION("-o %d", offset, 1),
176	OPTION("--size %d", size, 1),
177	OPTION("-s %d", size, 1),
178	OPTION("-l", fList, 1),
179	OPTION("--list", fList, 1),
180	OPTION("--verbose", fVerbose, 1),
181	OPTION("-v", fVerbose, 1),
182	OPTION("--wide", fWide, 1),
183	OPTION("-w", fWide, 1),
184	OPTION("-lv", fVerboseList, 1),
185	OPTION("-vl", fVerboseList, 1),
186	OPTION("-lw", fWideList, 1),
187	OPTION("-wl", fWideList, 1),
188	OPTION("-h", fBriefUsage, 1),
189	FUSE_OPT_KEY("--help", USAGE_FLAG),
190	FUSE_OPT_KEY("-vm", FUSE_OPT_KEY_NONOPT),
191	FUSE_OPT_END
192	};
193
194	typedef struct IMAGELIST
195	{
196	struct IMAGELIST *next;
197	struct IMAGELIST *prev;
198	ComPtr<IToken> pLockToken;
199	bool fWriteable;
200	ComPtr<IMedium> pImage;
201	Bstr pImageName;
202	Bstr pImagePath;
203	} IMAGELIST;
204
205	IMAGELIST listHeadLockList; /* flink & blink intentionally left NULL */
206
207	static void
208	briefUsage()
209	{
210	RTPrintf("usage: vboximg-mount [options] <mount point directory path>\n\n"
211	"vboximg-mount options:\n\n"
212	" [ { -i \| --image } <specifier> ] VirtualBox disk base image or snapshot,\n"
213	" specified by UUID or path\n"
214	"\n"
215	" [ { -l \| --list } ] If --image specified, list its partitions,\n"
216	" otherwise, list registered VMs and their\n"
217	" attached virtual HDD disk media. In verbose\n"
218	" mode, VM/media list will be long format,\n"
219	" i.e. including snapshot images and paths.\n"
220	"\n"
221	" [ { -w \| --wide } ] List media in wide / tabular format\n"
222	" (reduces vertical scrolling but requires\n"
223	" wider than standard 80 column window)\n"
224	"\n"
225	" [ --vm UUID ] Restrict media list to specified vm.\n"
226	"\n"
227	" [ { -p \| --partition } <part #> ] Expose only specified partition via FUSE.\n"
228	"\n"
229	" [ { -o \| --offset } <byte #> ] Bias disk I/O by offset from disk start.\n"
230	" (incompatible with -p, --partition)\n"
231	"\n"
232	" [ { -s \| --size <bytes> } ] Specify size of mounted disk.\n"
233	" (incompatible with -p, --partition)\n"
234	"\n"
235	" [ --rw ] Make image writeable (default = readonly)\n"
236	"\n"
237	" [ --root ] Same as -o allow_root.\n"
238	"\n"
239	" [ { -v \| --verbose } ] Log extra information.\n"
240	"\n"
241	" [ -o opt[,opt...]] FUSE mount options.\n"
242	"\n"
243	" [ { --help \| -h \| -? } ] Display this usage information.\n"
244	);
245	RTPrintf("\n"
246	"vboximg-mount is a utility to make VirtualBox disk images available to the host\n"
247	"operating system for privileged or non-priviliged access. Any version of the\n"
248	"disk can be mounted from its available history of snapshots.\n"
249	"\n"
250	"If the user specifies a base image identifier using the --image option, only\n"
251	"the base image will be mounted, disregarding any snapshots. Alternatively,\n"
252	"if a snapshot is specified, the state of the FUSE-mounted virtual disk\n"
253	"is synthesized from the implied chain of snapshots, including the base image.\n"
254	"\n"
255	"The virtual disk is exposed as a device node within a FUSE-based filesystem\n"
256	"that overlays the user-provided mount point. The FUSE filesystem consists of a\n"
257	"directory containing two files: A pseudo HDD device node and a symbolic\n"
258	"link. The device node, named 'vhdd', is the access point to the virtual disk\n"
259	"(i.e. the OS-mountable raw binary). The symbolic link has the same basename(1)\n"
260	"as the virtual disk base image and points to the location of the\n"
261	"virtual disk base image. If the --partition, --offset, or --size\n"
262	"options are provided, the boundaries of the FUSE-mounted subsection of the\n"
263	"virtual disk will be described as a numeric range in brackets appended to the\n"
264	"symbolic link name.\n"
265	"\n"
266	);
267	}
268
269	static int
270	vboximgOptHandler(void data, const char arg, int optKey, struct fuse_args *outargs)
271	{
272	NOREF(data);
273	NOREF(arg);
274	NOREF(optKey);
275	NOREF(outargs);
276
277	/*
278	* Apparently this handler is only called for arguments FUSE can't parse,
279	* and arguments that don't result in variable assignment such as "USAGE"
280	* In this impl. that's always deemed a parsing error.
281	*/
282	if (arg != '-') / could be user's mount point */
283	return 1;
284
285	return -1;
286	}
287
288	/** @copydoc fuse_operations::open */
289	static int vboximgOp_open(const char pszPath, struct fuse_file_info pInfo)
290	{
291	RT_NOREF(pszPath, pInfo);;
292	LogFlowFunc(("pszPath=%s\n", pszPath));
293	uint32_t notsup = 0;
294	int rc = 0;
295
296	#ifdef UNIX_DERIVATIVE
297	# ifdef RT_OS_DARWIN
298	notsup = O_APPEND \| O_NONBLOCK \| O_SYMLINK \| O_NOCTTY \| O_SHLOCK \| O_EXLOCK \|
299	O_ASYNC \| O_CREAT \| O_TRUNC \| O_EXCL \| O_EVTONLY;
300	# elif defined(RT_OS_LINUX)
301	notsup = O_APPEND \| O_ASYNC \| O_DIRECT \| O_NOATIME \| O_NOCTTY \| O_NOFOLLOW \| O_NONBLOCK;
302	/* \| O_LARGEFILE \| O_SYNC \| ? */
303	# elif defined(RT_OS_FREEBSD)
304	notsup = O_APPEND \| O_ASYNC \| O_DIRECT \| O_NOCTTY \| O_NOFOLLOW \| O_NONBLOCK;
305	/* \| O_LARGEFILE \| O_SYNC \| ? */
306	# endif
307	#else
308	# error "Port me"
309	#endif
310
311	if (pInfo->flags & notsup)
312	rc -EINVAL;
313
314	#ifdef UNIX_DERIVATIVE
315	if ((pInfo->flags & O_ACCMODE) == O_ACCMODE)
316	rc = -EINVAL;
317	# ifdef O_DIRECTORY
318	if (pInfo->flags & O_DIRECTORY)
319	rc = -ENOTDIR;
320	# endif
321	#endif
322
323	if (RT_FAILURE(rc))
324	{
325	LogFlowFunc(("rc=%d \"%s\"\n", rc, pszPath));
326	return rc;
327	}
328
329	int fWriteable = (pInfo->flags & O_ACCMODE) == O_WRONLY
330	\|\| (pInfo->flags & O_ACCMODE) == O_RDWR;
331	if (g_cWriters)
332	rc = -ETXTBSY;
333	else
334	{
335	if (fWriteable)
336	g_cWriters++;
337	else
338	{
339	if (g_cReaders + 1 > MAX_READERS)
340	rc = -EMLINK;
341	else
342	g_cReaders++;
343	}
344	}
345	LogFlowFunc(("rc=%d \"%s\"\n", rc, pszPath));
346	return rc;
347
348	}
349
350
351	/** @todo Remove when VD I/O becomes threadsafe */
352	static DECLCALLBACK(int) vboximgThreadStartRead(void *pvUser)
353	{
354	PRTCRITSECT vdioLock = (PRTCRITSECT)pvUser;
355	return RTCritSectEnter(vdioLock);
356	}
357
358	static DECLCALLBACK(int) vboximgThreadFinishRead(void *pvUser)
359	{
360	PRTCRITSECT vdioLock = (PRTCRITSECT)pvUser;
361	return RTCritSectLeave(vdioLock);
362	}
363
364	static DECLCALLBACK(int) vboximgThreadStartWrite(void *pvUser)
365	{
366	PRTCRITSECT vdioLock = (PRTCRITSECT)pvUser;
367	return RTCritSectEnter(vdioLock);
368	}
369
370	static DECLCALLBACK(int) vboximgThreadFinishWrite(void *pvUser)
371	{
372	PRTCRITSECT vdioLock = (PRTCRITSECT)pvUser;
373	return RTCritSectLeave(vdioLock);
374	}
375	/** @todo (end of to do section) */
376
377	/** @copydoc fuse_operations::release */
378	static int vboximgOp_release(const char pszPath, struct fuse_file_info pInfo)
379	{
380	NOREF(pszPath);
381
382	LogFlowFunc(("pszPath=%s\n", pszPath));
383
384	if ( (pInfo->flags & O_ACCMODE) == O_WRONLY
385	\|\| (pInfo->flags & O_ACCMODE) == O_RDWR)
386	{
387	g_cWriters--;
388	Assert(g_cWriters >= 0);
389	}
390	else if ((pInfo->flags & O_ACCMODE) == O_RDONLY)
391	{
392	g_cReaders--;
393	Assert(g_cReaders >= 0);
394	}
395	else
396	AssertFailed();
397
398	LogFlowFunc(("\"%s\"\n", pszPath));
399	return 0;
400	}
401
402	/**
403	* VD read Sanitizer taking care of unaligned accesses.
404	*
405	* @return VBox bootIndicator code.
406	* @param pDisk VD disk container.
407	* @param off Offset to start reading from.
408	* @param pvBuf Pointer to the buffer to read into.
409	* @param cbRead Amount of bytes to read.
410	*/
411	static int vdReadSanitizer(PVDISK pDisk, uint64_t off, void *pvBuf, size_t cbRead)
412	{
413	int rc;
414
415	uint64_t const cbMisalignmentOfStart = off & VD_SECTOR_MASK;
416	uint64_t const cbMisalignmentOfEnd = (off + cbRead) & VD_SECTOR_MASK;
417
418	if (cbMisalignmentOfStart + cbMisalignmentOfEnd == 0) /* perfectly aligned request; just read it and done */
419	rc = VDRead(pDisk, off, pvBuf, cbRead);
420	else
421	{
422	uint8_t pbBuf = (uint8_t )pvBuf;
423	uint8_t abBuf[VD_SECTOR_SIZE];
424
425	/* If offset not @ sector boundary, read whole sector, then copy unaligned
426	* bytes (requested by user), only up to sector boundary, into user's buffer
427	*/
428	if (cbMisalignmentOfStart)
429	{
430	rc = VDRead(pDisk, off - cbMisalignmentOfStart, abBuf, VD_SECTOR_SIZE);
431	if (RT_SUCCESS(rc))
432	{
433	size_t const cbPartial = RT_MIN(VD_SECTOR_SIZE - cbMisalignmentOfStart, cbRead);
434	memcpy(pbBuf, &abBuf[cbMisalignmentOfStart], cbPartial);
435	pbBuf += cbPartial;
436	off += cbPartial; /* Beginning of next sector or EOD */
437	cbRead -= cbPartial; /* # left to read */
438	}
439	}
440	else /* user's offset already aligned, did nothing */
441	rc = VINF_SUCCESS;
442
443	/* Read remaining aligned sectors, deferring any tail-skewed bytes */
444	if (RT_SUCCESS(rc) && cbRead >= VD_SECTOR_SIZE)
445	{
446	Assert(!(off % VD_SECTOR_SIZE));
447
448	size_t cbPartial = cbRead - cbMisalignmentOfEnd;
449	Assert(!(cbPartial % VD_SECTOR_SIZE));
450	rc = VDRead(pDisk, off, pbBuf, cbPartial);
451	if (RT_SUCCESS(rc))
452	{
453	pbBuf += cbPartial;
454	off += cbPartial;
455	cbRead -= cbPartial;
456	}
457	}
458
459	/* Unaligned buffered read of tail. */
460	if (RT_SUCCESS(rc) && cbRead)
461	{
462	Assert(cbRead == cbMisalignmentOfEnd);
463	Assert(cbRead < VD_SECTOR_SIZE);
464	Assert(!(off % VD_SECTOR_SIZE));
465
466	rc = VDRead(pDisk, off, abBuf, VD_SECTOR_SIZE);
467	if (RT_SUCCESS(rc))
468	memcpy(pbBuf, abBuf, cbRead);
469	}
470	}
471
472	if (RT_FAILURE(rc))
473	{
474	int sysrc = -RTErrConvertToErrno(rc);
475	LogFlowFunc(("error: %s (vbox err: %d)\n", strerror(sysrc), rc));
476	rc = sysrc;
477	}
478	return cbRead;
479	}
480
481	/**
482	* VD write Sanitizer taking care of unaligned accesses.
483	*
484	* @return VBox bootIndicator code.
485	* @param pDisk VD disk container.
486	* @param off Offset to start writing to.
487	* @param pvSrc Pointer to the buffer to read from.
488	* @param cbWrite Amount of bytes to write.
489	*/
490	static int vdWriteSanitizer(PVDISK pDisk, uint64_t off, const void *pvSrc, size_t cbWrite)
491	{
492	uint8_t const pbSrc = (uint8_t const )pvSrc;
493	uint8_t abBuf[4096];
494	int rc;
495	int cbRemaining = cbWrite;
496
497	/*
498	* Take direct route if the request is sector aligned.
499	*/
500	uint64_t const cbMisalignmentOfStart = off & VD_SECTOR_MASK;
501	size_t const cbMisalignmentOfEnd = (off + cbWrite) & VD_SECTOR_MASK;
502	if (!cbMisalignmentOfStart && !cbMisalignmentOfEnd)
503	{
504	rc = VDWrite(pDisk, off, pbSrc, cbWrite);
505	do
506	{
507	size_t cbThisWrite = RT_MIN(cbWrite, sizeof(abBuf));
508	rc = VDWrite(pDisk, off, memcpy(abBuf, pbSrc, cbThisWrite), cbThisWrite);
509	if (RT_SUCCESS(rc))
510	{
511	pbSrc += cbThisWrite;
512	off += cbThisWrite;
513	cbRemaining -= cbThisWrite;
514	}
515	else
516	break;
517	} while (cbRemaining > 0);
518	}
519	else
520	{
521	/*
522	* Unaligned buffered read+write of head. Aligns the offset.
523	*/
524	if (cbMisalignmentOfStart)
525	{
526	rc = VDRead(pDisk, off - cbMisalignmentOfStart, abBuf, VD_SECTOR_SIZE);
527	if (RT_SUCCESS(rc))
528	{
529	size_t const cbPartial = RT_MIN(VD_SECTOR_SIZE - cbMisalignmentOfStart, cbWrite);
530	memcpy(&abBuf[cbMisalignmentOfStart], pbSrc, cbPartial);
531	rc = VDWrite(pDisk, off - cbMisalignmentOfStart, abBuf, VD_SECTOR_SIZE);
532	if (RT_SUCCESS(rc))
533	{
534	pbSrc += cbPartial;
535	off += cbPartial;
536	cbRemaining -= cbPartial;
537	}
538	}
539	}
540	else
541	rc = VINF_SUCCESS;
542
543	/*
544	* Aligned direct write.
545	*/
546	if (RT_SUCCESS(rc) && cbWrite >= VD_SECTOR_SIZE)
547	{
548	Assert(!(off % VD_SECTOR_SIZE));
549	size_t cbPartial = cbWrite - cbMisalignmentOfEnd;
550	Assert(!(cbPartial % VD_SECTOR_SIZE));
551	rc = VDWrite(pDisk, off, pbSrc, cbPartial);
552	if (RT_SUCCESS(rc))
553	{
554	pbSrc += cbPartial;
555	off += cbPartial;
556	cbRemaining -= cbPartial;
557	}
558	}
559
560	/*
561	* Unaligned buffered read + write of tail.
562	*/
563	if ( RT_SUCCESS(rc) && cbWrite > 0)
564	{
565	Assert(cbWrite == cbMisalignmentOfEnd);
566	Assert(cbWrite < VD_SECTOR_SIZE);
567	Assert(!(off % VD_SECTOR_SIZE));
568	rc = VDRead(pDisk, off, abBuf, VD_SECTOR_SIZE);
569	if (RT_SUCCESS(rc))
570	{
571	memcpy(abBuf, pbSrc, cbWrite);
572	rc = VDWrite(pDisk, off, abBuf, VD_SECTOR_SIZE);
573	}
574	}
575	}
576	if (RT_FAILURE(rc))
577	{
578	int sysrc = -RTErrConvertToErrno(rc);
579	LogFlowFunc(("error: %s (vbox err: %d)\n", strerror(sysrc), rc));
580	return sysrc;
581	}
582	return cbWrite - cbRemaining;
583	}
584
585
586	/** @copydoc fuse_operations::read */
587	static int vboximgOp_read(const char pszPath, char pbBuf, size_t cbBuf,
588	off_t offset, struct fuse_file_info *pInfo)
589	{
590	NOREF(pszPath);
591	NOREF(pInfo);
592
593	LogFlowFunc(("my offset=%#llx size=%#zx path=\"%s\"\n", (uint64_t)offset, cbBuf, pszPath));
594
595	AssertReturn(offset >= 0, -EINVAL);
596	AssertReturn((int)cbBuf >= 0, -EINVAL);
597	AssertReturn((unsigned)cbBuf == cbBuf, -EINVAL);
598
599	AssertReturn(offset + g_vDiskOffset >= 0, -EINVAL);
600	int64_t adjOff = offset + g_vDiskOffset;
601
602	int rc = 0;
603	if ((off_t)(adjOff + cbBuf) < adjOff)
604	rc = -EINVAL;
605	else if (adjOff >= g_vDiskSize)
606	return 0;
607	else if (!cbBuf)
608	return 0;
609
610	if (rc >= 0)
611	rc = vdReadSanitizer(g_pVDisk, adjOff, pbBuf, cbBuf);
612	if (rc < 0)
613	LogFlowFunc(("%s\n", strerror(rc)));
614	return rc;
615	}
616
617	/** @copydoc fuse_operations::write */
618	static int vboximgOp_write(const char pszPath, const char pbBuf, size_t cbBuf,
619	off_t offset, struct fuse_file_info *pInfo)
620	{
621	NOREF(pszPath);
622	NOREF(pInfo);
623
624	LogFlowFunc(("offset=%#llx size=%#zx path=\"%s\"\n", (uint64_t)offset, cbBuf, pszPath));
625
626	AssertReturn(offset >= 0, -EINVAL);
627	AssertReturn((int)cbBuf >= 0, -EINVAL);
628	AssertReturn((unsigned)cbBuf == cbBuf, -EINVAL);
629	AssertReturn(offset + g_vDiskOffset >= 0, -EINVAL);
630	int64_t adjOff = offset + g_vDiskOffset;
631
632	int rc = 0;
633	if (!g_vboximgOpts.fRW) {
634	LogFlowFunc(("WARNING: vboximg-mount (FUSE FS) --rw option not specified\n"
635	" (write operation ignored w/o error!)\n"));
636	return cbBuf;
637	} else if ((off_t)(adjOff + cbBuf) < adjOff)
638	rc = -EINVAL;
639	else if (offset >= g_vDiskSize)
640	return 0;
641	else if (!cbBuf)
642	return 0;
643
644	if (rc >= 0)
645	rc = vdWriteSanitizer(g_pVDisk, adjOff, pbBuf, cbBuf);
646	if (rc < 0)
647	LogFlowFunc(("%s\n", strerror(rc)));
648
649	return rc;
650	}
651
652	/** @copydoc fuse_operations::getattr */
653	static int
654	vboximgOp_getattr(const char pszPath, struct stat stbuf)
655	{
656	int rc = 0;
657
658	LogFlowFunc(("pszPath=%s, stat(\"%s\")\n", pszPath, g_pszImagePath));
659
660	memset(stbuf, 0, sizeof(struct stat));
661
662	if (RTStrCmp(pszPath, "/") == 0)
663	{
664	stbuf->st_mode = S_IFDIR \| 0755;
665	stbuf->st_nlink = 2;
666	}
667	else if (RTStrCmp(pszPath + 1, "vhdd") == 0)
668	{
669	rc = stat(g_pszImagePath, stbuf);
670	if (rc < 0)
671	return rc;
672	/*
673	* st_size represents the size of the FUSE FS-mounted portion of the disk.
674	* By default it is the whole disk, but can be a partition or specified
675	* (or overridden) directly by the { -s \| --size } option on the command line.
676	*/
677	stbuf->st_size = g_vDiskSize;
678	stbuf->st_nlink = 1;
679	}
680	else if (RTStrNCmp(pszPath + 1, g_pszImageName, strlen(g_pszImageName)) == 0)
681	{
682	/* When the disk is partitioned, the symbolic link named from `basename` of
683	* resolved path to VBox disk image, has appended to it formatted text
684	* representing the offset range of the partition.
685	*
686	* $ vboximg-mount -i /stroll/along/the/path/simple_fixed_disk.vdi -p 1 /mnt/tmpdir
687	* $ ls /mnt/tmpdir
688	* simple_fixed_disk.vdi[20480:2013244928] vhdd
689	*/
690	rc = stat(g_pszImagePath, stbuf);
691	if (rc < 0)
692	return rc;
693	stbuf->st_size = 0;
694	stbuf->st_mode = S_IFLNK \| 0444;
695	stbuf->st_nlink = 1;
696	stbuf->st_uid = 0;
697	stbuf->st_gid = 0;
698	} else
699	rc = -ENOENT;
700
701	return rc;
702	}
703
704	/** @copydoc fuse_operations::readdir */
705	static int
706	vboximgOp_readdir(const char pszPath, void pvBuf, fuse_fill_dir_t pfnFiller,
707	off_t offset, struct fuse_file_info *pInfo)
708
709	{
710	NOREF(offset);
711	NOREF(pInfo);
712
713	if (RTStrCmp(pszPath, "/") != 0)
714	return -ENOENT;
715
716	/*
717	* mandatory '.', '..', ...
718	*/
719	pfnFiller(pvBuf, ".", NULL, 0);
720	pfnFiller(pvBuf, "..", NULL, 0);
721
722	/*
723	* Create FUSE FS dir entry that is depicted here (and exposed via stat()) as
724	* a symbolic link back to the resolved path to the VBox virtual disk image,
725	* whose symlink name is basename that path. This is a convenience so anyone
726	* listing the dir can figure out easily what the vhdd FUSE node entry
727	* represents.
728	*/
729
730	if (g_vDiskOffset == 0 && (g_vDiskSize == 0 \|\| g_vDiskSize == g_cbEntireVDisk))
731	pfnFiller(pvBuf, g_pszImageName, NULL, 0);
732	else
733	{
734	char tmp[BASENAME_MAX];
735	RTStrPrintf(tmp, sizeof (tmp), "%s[%jd:%jd]", g_pszImageName, g_vDiskOffset, g_vDiskSize);
736	pfnFiller(pvBuf, tmp, NULL, 0);
737	}
738	/*
739	* Create entry named "vhdd", which getattr() will describe as a
740	* regular file, and thus will go through the open/release/read/write vectors
741	* to access the VirtualBox image as processed by the IRPT VD API.
742	*/
743	pfnFiller(pvBuf, "vhdd", NULL, 0);
744	return 0;
745	}
746
747	/** @copydoc fuse_operations::readlink */
748	static int
749	vboximgOp_readlink(const char pszPath, char buf, size_t size)
750	{
751	NOREF(pszPath);
752	RTStrCopy(buf, size, g_pszImagePath);
753	return 0;
754	}
755
756	uint8_t
757	parsePartitionTable(void)
758	{
759	MBR_t mbr;
760	EBR_t ebr;
761	PTH_t parTblHdr;
762
763	ASSERT(sizeof (mbr) == 512);
764	ASSERT(sizeof (ebr) == 512);
765	/*
766	* First entry describes entire disk as a single entity
767	*/
768	g_aParsedPartitionInfo[0].idxPartition = 0;
769	g_aParsedPartitionInfo[0].offPartition = 0;
770	g_aParsedPartitionInfo[0].cbPartition = VDGetSize(g_pVDisk, 0);
771	g_aParsedPartitionInfo[0].pszName = RTStrDup("EntireDisk");
772
773	/*
774	* Currently only DOS partitioned disks are supported. Ensure this one conforms
775	*/
776	int rc = vdReadSanitizer(g_pVDisk, 0, &mbr, sizeof (mbr));
777	if (RT_FAILURE(rc))
778	return RTMsgErrorExitFailure("Error reading MBR block from disk\n");
779
780	if (mbr.signature == NULL_BOOT_RECORD_SIGNATURE)
781	return RTMsgErrorExitFailure("Unprt disk (null MBR signature)\n");
782
783	if (mbr.signature != DOS_BOOT_RECORD_SIGNATURE)
784	return RTMsgErrorExitFailure("Invalid MBR found on image with signature 0x%04hX\n",
785	mbr.signature);
786	/*
787	* Parse the four physical partition entires in the MBR (any one, and only one, can be an EBR)
788	*/
789	int idxEbrPartitionInMbr = 0;
790	for (int idxPartition = 1;
791	idxPartition <= MBR_PARTITIONS_MAX;
792	idxPartition++)
793	{
794	MBRPARTITIONENTRY *pMbrPartitionEntry =
795	&g_aParsedPartitionInfo[idxPartition].partitionEntry.mbrEntry;;
796	memcpy (pMbrPartitionEntry, &mbr.partitionEntry[idxPartition - 1], sizeof (MBRPARTITIONENTRY));
797
798	if (PARTTYPE_IS_NULL(pMbrPartitionEntry->type))
799	continue;
800
801	if (PARTTYPE_IS_EXT(pMbrPartitionEntry->type))
802	{
803	if (idxEbrPartitionInMbr)
804	return RTMsgErrorExitFailure("Multiple EBRs found found in MBR\n");
805	idxEbrPartitionInMbr = idxPartition;
806	}
807
808	PARTITIONINFO *ppi = &g_aParsedPartitionInfo[idxPartition];
809
810	ppi->idxPartition = idxPartition;
811	ppi->offPartition = (off_t) pMbrPartitionEntry->partitionLba * BLOCKSIZE;
812	ppi->cbPartition = (off_t) pMbrPartitionEntry->partitionBlkCnt * BLOCKSIZE;
813	ppi->fBootable = pMbrPartitionEntry->bootIndicator == 0x80;
814	ppi->partitionType.legacy = pMbrPartitionEntry->type;
815
816	g_lastPartNbr = idxPartition;
817
818	if (PARTTYPE_IS_GPT(pMbrPartitionEntry->type))
819	{
820	g_fGPT = true;
821	break;
822	}
823	}
824
825	if (g_fGPT)
826	{
827	g_lastPartNbr = 2; /* from the 'protective MBR' */
828
829	rc = vdReadSanitizer(g_pVDisk, LBA(1), &parTblHdr, sizeof (parTblHdr));
830	if (RT_FAILURE(rc))
831	return RTMsgErrorExitFailure("Error reading Partition Table Header (LBA 1) from disk\n");
832
833	uint8_t pTblBuf = (uint8_t )RTMemAlloc(GPT_PTABLE_SIZE);
834
835	if (!pTblBuf)
836	return RTMsgErrorExitFailure("Out of memory\n");
837
838	rc = vdReadSanitizer(g_pVDisk, LBA(2), pTblBuf, GPT_PTABLE_SIZE);
839	if (RT_FAILURE(rc))
840	return RTMsgErrorExitFailure("Error reading Partition Table blocks from disk\n");
841
842	uint32_t cEntries = parTblHdr.cPartitionEntries;
843	uint32_t cbEntry = parTblHdr.cbPartitionEntry;
844	if (cEntries * cbEntry > GPT_PTABLE_SIZE)
845	{
846	RTPrintf("Partition entries exceed GPT table read from disk (pruning!)\n");
847	while (cEntries * cbEntry > GPT_PTABLE_SIZE && cEntries > 0)
848	--cEntries;
849	}
850	uint8_t *pEntryRaw = pTblBuf;
851	for (uint32_t i = 0; i < cEntries; i++)
852	{
853	GPTPARTITIONENTRY pEntry = (GPTPARTITIONENTRY )pEntryRaw;
854	PARTITIONINFO *ppi = &g_aParsedPartitionInfo[g_lastPartNbr];
855	memcpy(&(ppi->partitionEntry).gptEntry, pEntry, sizeof(GPTPARTITIONENTRY));
856	if (!pEntry->firstLba)
857	break;
858	ppi->offPartition = pEntry->firstLba * BLOCKSIZE;
859	ppi->cbPartition = (pEntry->lastLba - pEntry->firstLba) * BLOCKSIZE;
860	ppi->fBootable = pEntry->attrFlags & (1 << GPT_LEGACY_BIOS_BOOTABLE);
861	ppi->partitionType.gptGuidTypeSpecifier = pEntry->partitionTypeGuid;
862	size_t cwName = sizeof (pEntry->partitionName) / 2;
863	RTUtf16LittleToUtf8Ex((PRTUTF16)pEntry->partitionName, RTSTR_MAX, &ppi->pszName, cwName, NULL);
864	ppi->idxPartition = g_lastPartNbr++;
865	pEntryRaw += cbEntry;
866	}
867	return PARTITION_TABLE_GPT;
868	}
869
870	/*
871	* Starting with EBR located in MBR, walk EBR chain to parse the logical partition entries
872	*/
873	if (idxEbrPartitionInMbr)
874	{
875	uint32_t firstEbrLba
876	= g_aParsedPartitionInfo[idxEbrPartitionInMbr].partitionEntry.mbrEntry.partitionLba;
877	off_t firstEbrOffset = (off_t)firstEbrLba * BLOCKSIZE;
878	off_t chainedEbrOffset = 0;
879
880	if (!firstEbrLba)
881	return RTMsgErrorExitFailure("Inconsistency for logical partition start. Aborting\n");
882
883	for (int idxPartition = 5;
884	idxPartition <= VBOXIMG_PARTITION_MAX;
885	idxPartition++)
886	{
887
888	off_t currentEbrOffset = firstEbrOffset + chainedEbrOffset;
889	vdReadSanitizer(g_pVDisk, currentEbrOffset, &ebr, sizeof (ebr));
890
891	if (ebr.signature != DOS_BOOT_RECORD_SIGNATURE)
892	return RTMsgErrorExitFailure("Invalid EBR found on image with signature 0x%04hX\n",
893	ebr.signature);
894
895	MBRPARTITIONENTRY *pEbrPartitionEntry =
896	&g_aParsedPartitionInfo[idxPartition].partitionEntry.mbrEntry; /* EBR entry struct same as MBR */
897	memcpy(pEbrPartitionEntry, &ebr.partitionEntry, sizeof (MBRPARTITIONENTRY));
898
899	if (pEbrPartitionEntry->type == NULL_BOOT_RECORD_SIGNATURE)
900	return RTMsgErrorExitFailure("Logical partition with type 0 encountered");
901
902	if (!pEbrPartitionEntry->partitionLba)
903	return RTMsgErrorExitFailure("Logical partition invalid partition start offset (LBA) encountered");
904
905	PARTITIONINFO *ppi = &g_aParsedPartitionInfo[idxPartition];
906	ppi->idxPartition = idxPartition;
907	ppi->offPartition = currentEbrOffset + (off_t)pEbrPartitionEntry->partitionLba * BLOCKSIZE;
908	ppi->cbPartition = (off_t)pEbrPartitionEntry->partitionBlkCnt * BLOCKSIZE;
909	ppi->fBootable = pEbrPartitionEntry->bootIndicator == 0x80;
910	ppi->partitionType.legacy = pEbrPartitionEntry->type;
911
912	g_lastPartNbr = idxPartition;
913
914	if (ebr.chainingPartitionEntry.type == 0) /* end of chain */
915	break;
916
917	if (!PARTTYPE_IS_EXT(ebr.chainingPartitionEntry.type))
918	return RTMsgErrorExitFailure("Logical partition chain broken");
919
920	chainedEbrOffset = ebr.chainingPartitionEntry.partitionLba * BLOCKSIZE;
921	}
922	}
923	return PARTITION_TABLE_MBR;
924	}
925
926	const char *getClassicPartitionDesc(uint8_t type)
927	{
928	for (uint32_t i = 0; i < sizeof (g_partitionDescTable) / sizeof (struct PartitionDesc); i++)
929	{
930	if (g_partitionDescTable[i].type == type)
931	return g_partitionDescTable[i].desc;
932	}
933	return "????";
934	}
935
936	void
937	displayGptPartitionTable(void)
938	{
939
940	RTPrintf( "Virtual disk image:\n\n");
941	RTPrintf(" Base: %s\n", g_pszBaseImagePath);
942	if (g_cImages > 1)
943	RTPrintf(" Diff: %s\n", g_pszImagePath);
944	if (g_pszDiskUuid)
945	RTPrintf(" UUID: %s\n\n", g_pszDiskUuid);
946
947	void *colBoot = NULL;
948
949	SELFSIZINGTABLE tbl(2);
950
951	/* Note: Omitting partition name column because type/UUID seems suffcient */
952	void *colPartNbr = tbl.addCol("#", "%3d", 1);
953
954	/* If none of the partitions supports legacy BIOS boot, don't show that column */
955	for (int idxPartition = 2; idxPartition <= g_lastPartNbr; idxPartition++)
956	if (g_aParsedPartitionInfo[idxPartition].fBootable) {
957	colBoot = tbl.addCol("Boot", "%c ", 1);
958	break;
959	}
960
961	void *colStart = tbl.addCol("Start", "%lld", 1);
962	void *colSectors = tbl.addCol("Sectors", "%lld", -1, 2);
963	void *colSize = tbl.addCol("Size", "%s", 1);
964	void *colOffset = tbl.addCol("Offset", "%lld", 1);
965	void *colType = tbl.addCol("Type", "%s", -1, 2);
966
967	#if 0 /* need to see how other OSes w/GPT use 'Name' field, right now 'Type' seems to suffice */
968	void colName = tbl.addCol("Name", "%s", -1); /
969	#endif
970
971	for (int idxPartition = 2; idxPartition <= g_lastPartNbr; idxPartition++)
972	{
973	PARTITIONINFO *ppi = &g_aParsedPartitionInfo[idxPartition];
974	if (ppi->idxPartition)
975	{
976	char abGuid[GUID_STRING_LENGTH * 2];
977	RTStrPrintf(abGuid, sizeof(abGuid), "%RTuuid", &ppi->partitionType.gptGuidTypeSpecifier);
978
979	char *pszPartitionTypeDesc = NULL;
980	for (uint32_t i = 0; i < sizeof(g_gptPartitionTypes) / sizeof(GPTPARTITIONTYPE); i++)
981	if (RTStrNICmp(abGuid, g_gptPartitionTypes[i].gptPartitionUuid, GUID_STRING_LENGTH) == 0)
982	{
983	pszPartitionTypeDesc = (char *)g_gptPartitionTypes[i].gptPartitionTypeDesc;
984	break;
985	}
986
987	if (!pszPartitionTypeDesc)
988	RTPrintf("Couldn't find GPT partitiontype for GUID: %s\n", abGuid);
989
990	void *row = tbl.addRow();
991	tbl.setCell(row, colPartNbr, idxPartition - 1);
992	if (colBoot)
993	tbl.setCell(row, colBoot, ppi->fBootable ? '*' : ' ');
994	tbl.setCell(row, colStart, ppi->offPartition / BLOCKSIZE);
995	tbl.setCell(row, colSectors, ppi->cbPartition / BLOCKSIZE);
996	tbl.setCell(row, colSize, vboximgScaledSize(ppi->cbPartition));
997	tbl.setCell(row, colOffset, ppi->offPartition);
998	tbl.setCell(row, colType, SAFENULL(pszPartitionTypeDesc));
999
1000	#if 0 /* see comment for stubbed-out 'Name' column definition above */
1001	tbl.setCell(row, colName, ppi->pszName);
1002	#endif
1003
1004	}
1005	}
1006	tbl.displayTable();
1007	RTPrintf ("\n");
1008	}
1009
1010	void
1011	displayLegacyPartitionTable(void)
1012	{
1013	/*
1014	* Partition table is most readable and concise when headers and columns
1015	* are adapted to the actual data, to avoid insufficient or excessive whitespace.
1016	*/
1017
1018	RTPrintf( "Virtual disk image:\n\n");
1019	RTPrintf(" Base: %s\n", g_pszBaseImagePath);
1020	if (g_cImages > 1)
1021	RTPrintf(" Diff: %s\n", g_pszImagePath);
1022	if (g_pszDiskUuid)
1023	RTPrintf(" UUID: %s\n\n", g_pszDiskUuid);
1024
1025	SELFSIZINGTABLE tbl(2);
1026
1027	void *colPartition = tbl.addCol("Partition", "%s(%d)", -1);
1028	void *colBoot = tbl.addCol("Boot", "%c ", 1);
1029	void *colStart = tbl.addCol("Start", "%lld", 1);
1030	void *colSectors = tbl.addCol("Sectors", "%lld", -1, 2);
1031	void *colSize = tbl.addCol("Size", "%s", 1);
1032	void *colOffset = tbl.addCol("Offset", "%lld", 1);
1033	void *colId = tbl.addCol("Id", "%2x", 1);
1034	void *colType = tbl.addCol("Type", "%s", -1, 2);
1035
1036	for (int idxPartition = 1; idxPartition <= g_lastPartNbr; idxPartition++)
1037	{
1038	PARTITIONINFO *p = &g_aParsedPartitionInfo[idxPartition];
1039	if (p->idxPartition)
1040	{
1041	void *row = tbl.addRow();
1042	tbl.setCell(row, colPartition, g_pszBaseImageName, idxPartition);
1043	tbl.setCell(row, colBoot, p->fBootable ? '*' : ' ');
1044	tbl.setCell(row, colStart, p->offPartition / BLOCKSIZE);
1045	tbl.setCell(row, colSectors, p->cbPartition / BLOCKSIZE);
1046	tbl.setCell(row, colSize, vboximgScaledSize(p->cbPartition));
1047	tbl.setCell(row, colOffset, p->offPartition);
1048	tbl.setCell(row, colId, p->partitionType.legacy);
1049	tbl.setCell(row, colType, getClassicPartitionDesc((p->partitionType).legacy));
1050	}
1051	}
1052	tbl.displayTable();
1053	RTPrintf ("\n");
1054	}
1055
1056	int
1057	main(int argc, char **argv)
1058	{
1059
1060	int rc = RTR3InitExe(argc, &argv, 0);
1061	if (RT_FAILURE(rc))
1062	return RTMsgErrorExitFailure("RTR3InitExe failed, rc=%Rrc\n", rc);
1063
1064	rc = VDInit();
1065	if (RT_FAILURE(rc))
1066	return RTMsgErrorExitFailure("VDInit failed, rc=%Rrc\n", rc);
1067
1068	memset(&g_vboximgOps, 0, sizeof(g_vboximgOps));
1069	g_vboximgOps.open = vboximgOp_open;
1070	g_vboximgOps.read = vboximgOp_read;
1071	g_vboximgOps.write = vboximgOp_write;
1072	g_vboximgOps.getattr = vboximgOp_getattr;
1073	g_vboximgOps.release = vboximgOp_release;
1074	g_vboximgOps.readdir = vboximgOp_readdir;
1075	g_vboximgOps.readlink = vboximgOp_readlink;
1076
1077	struct fuse_args args = FUSE_ARGS_INIT(argc, argv);
1078	memset(&g_vboximgOpts, 0, sizeof(g_vboximgOpts));
1079
1080	g_vboximgOpts.idxPartition = -1;
1081
1082	rc = fuse_opt_parse(&args, &g_vboximgOpts, vboximgOptDefs, vboximgOptHandler);
1083	if (rc < 0 \|\| argc < 2 \|\| RTStrCmp(argv[1], "-?" ) == 0 \|\| g_vboximgOpts.fBriefUsage)
1084	{
1085	briefUsage();
1086	return 0;
1087	}
1088
1089	if (g_vboximgOpts.fAllowRoot)
1090	fuse_opt_add_arg(&args, "-oallow_root");
1091
1092	/*
1093	* FUSE doesn't seem to like combining options with one hyphen, as traditional UNIX
1094	* command line utilities allow. The following flags, fWideList and fVerboseList,
1095	* and their respective option definitions give the appearance of combined opts,
1096	* so that -vl, -lv, -wl, -lw options are allowed, since those in particular would
1097	* tend to conveniently facilitate some of the most common use cases.
1098	*/
1099	if (g_vboximgOpts.fWideList)
1100	{
1101	g_vboximgOpts.fWide = true;
1102	g_vboximgOpts.fList = true;
1103	}
1104	if (g_vboximgOpts.fVerboseList)
1105	{
1106	g_vboximgOpts.fVerbose = true;
1107	g_vboximgOpts.fList = true;
1108	}
1109	if (g_vboximgOpts.fAllowRoot)
1110	fuse_opt_add_arg(&args, "-oallow_root");
1111
1112	/*
1113	* Initialize COM.
1114	*/
1115	using namespace com;
1116	HRESULT hrc = com::Initialize();
1117	if (FAILED(hrc))
1118	{
1119	# ifdef VBOX_WITH_XPCOM
1120	if (hrc == NS_ERROR_FILE_ACCESS_DENIED)
1121	{
1122	char szHome[RTPATH_MAX] = "";
1123	com::GetVBoxUserHomeDirectory(szHome, sizeof(szHome));
1124	return RTMsgErrorExit(RTEXITCODE_FAILURE,
1125	"Failed to initialize COM because the global settings directory '%s' is not accessible!", szHome);
1126	}
1127	# endif
1128	return RTMsgErrorExit(RTEXITCODE_FAILURE, "Failed to initialize COM! (hrc=%Rhrc)", hrc);
1129	}
1130
1131	/*
1132	* Get the remote VirtualBox object and create a local session object.
1133	*/
1134	ComPtr<IVirtualBoxClient> pVirtualBoxClient;
1135	ComPtr<IVirtualBox> pVirtualBox;
1136
1137	hrc = pVirtualBoxClient.createInprocObject(CLSID_VirtualBoxClient);
1138	if (SUCCEEDED(hrc))
1139	hrc = pVirtualBoxClient->COMGETTER(VirtualBox)(pVirtualBox.asOutParam());
1140
1141	if (FAILED(hrc))
1142	return RTMsgErrorExit(RTEXITCODE_FAILURE, "Failed to get IVirtualBox object! (hrc=%Rhrc)", hrc);
1143
1144	if (g_vboximgOpts.fList && g_vboximgOpts.pszImageUuidOrPath == NULL)
1145	{
1146	vboximgListVMs(pVirtualBox);
1147	return VINF_SUCCESS;
1148	}
1149
1150	Bstr pMediumUuid;
1151	ComPtr<IMedium> pVDiskMedium = NULL;
1152	char *pszFormat;
1153	VDTYPE enmType;
1154
1155	/*
1156	* Open chain of images from what is provided on command line, to base image
1157	*/
1158	if (g_vboximgOpts.pszImageUuidOrPath)
1159	{
1160	/* compiler was too fussy about access mode's data type in conditional expr, so... */
1161	if (g_vboximgOpts.fRW)
1162	CHECK_ERROR(pVirtualBox, OpenMedium(Bstr(g_vboximgOpts.pszImageUuidOrPath).raw(), DeviceType_HardDisk,
1163	AccessMode_ReadWrite, false /* forceNewUuid */, pVDiskMedium.asOutParam()));
1164
1165	else
1166	CHECK_ERROR(pVirtualBox, OpenMedium(Bstr(g_vboximgOpts.pszImageUuidOrPath).raw(), DeviceType_HardDisk,
1167	AccessMode_ReadOnly, false /* forceNewUuid */, pVDiskMedium.asOutParam()));
1168
1169	if (FAILED(rc))
1170	return RTMsgErrorExitFailure("\nCould't find specified VirtualBox base or snapshot disk image:\n%s",
1171	g_vboximgOpts.pszImageUuidOrPath);
1172
1173
1174	CHECK_ERROR(pVDiskMedium, COMGETTER(Id)(pMediumUuid.asOutParam()));
1175	g_pszDiskUuid = RTStrDup((char *)CSTR(pMediumUuid));
1176
1177	/*
1178	* Lock & cache the disk image media chain (from leaf to base).
1179	* Only leaf can be rw (and only if media is being mounted in non-default writable (rw) mode)
1180	*
1181	* Note: Failure to acquire lock is intentionally fatal (e.g. program termination)
1182	*/
1183
1184	if (VERBOSE)
1185	RTPrintf("\nAttempting to lock medium chain from leaf image to base image\n");
1186
1187	bool fLeaf = true;
1188	g_cImages = 0;
1189
1190	do
1191	{
1192	++g_cImages;
1193	IMAGELIST *pNewEntry= new IMAGELIST();
1194	pNewEntry->pImage = pVDiskMedium;
1195	CHECK_ERROR(pVDiskMedium, COMGETTER(Name)((pNewEntry->pImageName).asOutParam()));
1196	CHECK_ERROR(pVDiskMedium, COMGETTER(Location)((pNewEntry->pImagePath).asOutParam()));
1197
1198	if (VERBOSE)
1199	RTPrintf(" %s", CSTR(pNewEntry->pImageName));
1200
1201	if (fLeaf && g_vboximgOpts.fRW)
1202	{
1203	if (VERBOSE)
1204	RTPrintf(" ... Locking for write\n");
1205	CHECK_ERROR_RET(pVDiskMedium, LockWrite((pNewEntry->pLockToken).asOutParam()), rc);
1206	pNewEntry->fWriteable = true;
1207	}
1208	else
1209	{
1210	if (VERBOSE)
1211	RTPrintf(" ... Locking for read\n");
1212	CHECK_ERROR_RET(pVDiskMedium, LockRead((pNewEntry->pLockToken).asOutParam()), rc);
1213	}
1214
1215	IMAGELIST *pCurImageEntry = &listHeadLockList;
1216	while (pCurImageEntry->next)
1217	pCurImageEntry = pCurImageEntry->next;
1218	pCurImageEntry->next = pNewEntry;
1219	pNewEntry->prev = pCurImageEntry;
1220	listHeadLockList.prev = pNewEntry;
1221
1222	CHECK_ERROR(pVDiskMedium, COMGETTER(Parent)(pVDiskMedium.asOutParam()));
1223	fLeaf = false;
1224	}
1225	while(pVDiskMedium);
1226	}
1227
1228	ComPtr<IMedium> pVDiskBaseMedium = listHeadLockList.prev->pImage;
1229	Bstr pVDiskBaseImagePath = listHeadLockList.prev->pImagePath;
1230	Bstr pVDiskBaseImageName = listHeadLockList.prev->pImageName;
1231
1232	g_pszBaseImagePath = RTStrDup((char *)CSTR(pVDiskBaseImagePath));
1233	g_pszBaseImageName = RTStrDup((char *)CSTR(pVDiskBaseImageName));
1234
1235	g_pszImagePath = RTStrDup((char *)CSTR(listHeadLockList.next->pImagePath));
1236	g_pszImageName = RTStrDup((char *)CSTR(listHeadLockList.next->pImageName));
1237
1238	/*
1239	* Attempt to VDOpen media (base and any snapshots), handling encryption,
1240	* if that property is set for base media
1241	*/
1242	Bstr pBase64EncodedKeyStore;
1243
1244	rc = pVDiskBaseMedium->GetProperty(Bstr("CRYPT/KeyStore").raw(), pBase64EncodedKeyStore.asOutParam());
1245	if (SUCCEEDED(rc) && strlen(CSTR(pBase64EncodedKeyStore)) != 0)
1246	{
1247	RTPrintf("\nvboximgMount: Encrypted disks not supported in this version\n\n");
1248	return -1;
1249	}
1250
1251
1252	/* *************** BEGIN IFDEF'D (STUBBED-OUT) CODE ************ */
1253	/* vvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvv */
1254
1255	#if 0 /* The following encrypted disk related code is stubbed out until it can be finished.
1256	* What is here is an attempt to port the VBoxSVC specific code in i_openForIO to
1257	* a client's proximity. It is supplemented by code in vboximgCrypto.cpp and
1258	* vboximageCrypt.h that was lifed from SecretKeyStore.cpp along with the setup
1259	* task function.
1260	*
1261	* The ultimate solution may be to use a simpler but less efficient COM interface,
1262	* or to use VD encryption interfaces and key containers entirely. The keystore
1263	* handling/filter approach that is here may be a bumbling hybrid approach
1264	* that is broken (trying to bridge incompatible disk encryption mechanisms) or otherwise
1265	* doesn't make sense. */
1266
1267	Bstr pKeyId;
1268	ComPtr<IExtPackManager> pExtPackManager;
1269	ComPtr<IExtPack> pExtPack;
1270	com::SafeIfaceArray<IExtPackPlugIn> pExtPackPlugIns;
1271
1272	if (SUCCEEDED(rc))
1273	{
1274	RTPrintf("Got GetProperty(\"CRYPT/KeyStore\") = %s\n", CSTR(pBase64EncodedKeyStore));
1275	if (strlen(CSTR(pBase64EncodedKeyStore)) == 0)
1276	return RTMsgErrorExitFailure("Image '%s' is configured for encryption but "
1277	"there is no key store to retrieve the password from", CSTR(pVDiskBaseImageName));
1278
1279	SecretKeyStore keyStore(false);
1280	RTBase64Decode(CSTR(pBase64EncodedKeyStore), &keyStore, sizeof (SecretKeyStore), NULL, NULL);
1281
1282	rc = pVDiskBaseMedium->GetProperty(Bstr("CRYPT/KeyId").raw(), pKeyId.asOutParam());
1283	if (SUCCEEDED(rc) && strlen(CSTR(pKeyId)) == 0)
1284	return RTMsgErrorExitFailure("Image '%s' is configured for encryption but "
1285	"doesn't have a key identifier set", CSTR(pVDiskBaseImageName));
1286
1287	RTPrintf(" key id: %s\n", CSTR(pKeyId));
1288
1289	#ifndef VBOX_WITH_EXTPACK
1290	return RTMsgErrorExitFailure(
1291	"Encryption is not supported because extension pack support is not built in");
1292	#endif
1293
1294	CHECK_ERROR(pVirtualBox, COMGETTER(ExtensionPackManager)(pExtPackManager.asOutParam()));
1295	BOOL fExtPackUsable;
1296	CHECK_ERROR(pExtPackManager, IsExtPackUsable((PRUnichar *)VBOX_EXTPACK, &fExtPackUsable));
1297	if (fExtPackUsable)
1298	{
1299	/* Load the PlugIn */
1300
1301	CHECK_ERROR(pExtPackManager, Find((PRUnichar *)VBOX_EXTPACK, pExtPack.asOutParam()));
1302	if (RT_FAILURE(rc))
1303	return RTMsgErrorExitFailure(
1304	"Encryption is not supported because the extension pack '%s' is missing",
1305	VBOX_EXTPACK);
1306
1307	CHECK_ERROR(pExtPack, COMGETTER(PlugIns)(ComSafeArrayAsOutParam(pExtPackPlugIns)));
1308
1309	Bstr pPlugInPath;
1310	size_t iPlugIn;
1311	for (iPlugIn = 0; iPlugIn < pExtPackPlugIns.size(); iPlugIn++)
1312	{
1313	Bstr pPlugInName;
1314	CHECK_ERROR(pExtPackPlugIns[iPlugIn], COMGETTER(Name)(pPlugInName.asOutParam()));
1315	if (RTStrCmp(CSTR(pPlugInName), "VDPlugInCrypt") == 0)
1316	{
1317	CHECK_ERROR(pExtPackPlugIns[iPlugIn], COMGETTER(ModulePath)(pPlugInPath.asOutParam()));
1318	break;
1319	}
1320	}
1321	if (iPlugIn == pExtPackPlugIns.size())
1322	return RTMsgErrorExitFailure("Encryption is not supported because the extension pack '%s' "
1323	"is missing the encryption PlugIn (old extension pack installed?)", VBOX_EXTPACK);
1324
1325	rc = VDPluginLoadFromFilename(CSTR(pPlugInPath));
1326	if (RT_FAILURE(rc))
1327	return RTMsgErrorExitFailure("Retrieving encryption settings of the image failed "
1328	"because the encryption PlugIn could not be loaded\n");
1329	}
1330
1331	SecretKey *pKey = NULL;
1332	rc = keyStore.retainSecretKey(Utf8Str(pKeyId), &pKey);
1333	if (RT_FAILURE(rc))
1334	return RTMsgErrorExitFailure(
1335	"Failed to retrieve the secret key with ID \"%s\" from the store (%Rrc)",
1336	CSTR(pKeyId), rc);
1337
1338	VDISKCRYPTOSETTINGS vdiskCryptoSettings, *pVDiskCryptoSettings = &vdiskCryptoSettings;
1339
1340	vboxImageCryptoSetup(pVDiskCryptoSettings, NULL,
1341	(const char )CSTR(pBase64EncodedKeyStore), (const char )pKey->getKeyBuffer(), false);
1342
1343	rc = VDFilterAdd(g_pVDisk, "CRYPT", VD_FILTER_FLAGS_DEFAULT, pVDiskCryptoSettings->vdFilterIfaces);
1344	keyStore.releaseSecretKey(Utf8Str(pKeyId));
1345
1346	if (rc == VERR_VD_PASSWORD_INCORRECT)
1347	return RTMsgErrorExitFailure("The password to decrypt the image is incorrect");
1348
1349	if (RT_FAILURE(rc))
1350	return RTMsgErrorExitFailure("Failed to load the decryption filter: %Rrc", rc);
1351	}
1352	#endif
1353
1354	/* ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ */
1355	/* ************** END IFDEF'D (STUBBED-OUT) CODE *************** */
1356
1357	rc = RTCritSectInit(&g_vdioLock);
1358	if (RT_SUCCESS(rc))
1359	{
1360	g_VDIfThreadSync.pfnStartRead = vboximgThreadStartRead;
1361	g_VDIfThreadSync.pfnFinishRead = vboximgThreadFinishRead;
1362	g_VDIfThreadSync.pfnStartWrite = vboximgThreadStartWrite;
1363	g_VDIfThreadSync.pfnFinishWrite = vboximgThreadFinishWrite;
1364	rc = VDInterfaceAdd(&g_VDIfThreadSync.Core, "vboximg_ThreadSync", VDINTERFACETYPE_THREADSYNC,
1365	&g_vdioLock, sizeof(VDINTERFACETHREADSYNC), &g_pVdIfs);
1366	}
1367	else
1368	return RTMsgErrorExitFailure("ERROR: Failed to create critsects "
1369	"for virtual disk I/O, rc=%Rrc\n", rc);
1370
1371	/*
1372	* Create HDD container to open base image and differencing images into
1373	*/
1374	rc = VDGetFormat(NULL /* pVDIIfsDisk /, NULL / pVDIIfsImage*/,
1375	CSTR(pVDiskBaseImagePath), &pszFormat, &enmType);
1376
1377	if (RT_FAILURE(rc))
1378	return RTMsgErrorExitFailure("VDGetFormat(,,%s,,) "
1379	"failed (during HDD container creation), rc=%Rrc\n", g_pszImagePath, rc);
1380
1381	if (VERBOSE)
1382	RTPrintf("\nCreating container for base image of format %s\n", pszFormat);
1383
1384	g_pVDisk = NULL;
1385	rc = VDCreate(g_pVdIfs, enmType, &g_pVDisk);
1386	if ((rc))
1387	return RTMsgErrorExitFailure("ERROR: Couldn't create virtual disk container\n");
1388
1389	/* Open all virtual disk media from leaf snapshot (if any) to base image*/
1390
1391	if (VERBOSE)
1392	RTPrintf("\nOpening medium chain\n");
1393
1394	IMAGELIST pCurMedium = listHeadLockList.prev; / point to base image */
1395	while (pCurMedium != &listHeadLockList)
1396	{
1397	if (VERBOSE)
1398	RTPrintf(" Open: %s\n", CSTR(pCurMedium->pImagePath));
1399
1400	rc = VDOpen(g_pVDisk,
1401	CSTR(pszFormat),
1402	CSTR(pCurMedium->pImagePath),
1403	pCurMedium->fWriteable,
1404	g_pVdIfs);
1405
1406	if (RT_FAILURE(rc))
1407	return RTMsgErrorExitFailure("Could not open the medium storage unit '%s' %Rrc",
1408	CSTR(pCurMedium->pImagePath), rc);
1409
1410	pCurMedium = pCurMedium->prev;
1411	}
1412
1413	g_cReaders = VDIsReadOnly(g_pVDisk) ? INT32_MAX / 2 : 0;
1414	g_cWriters = 0;
1415	g_cbEntireVDisk = VDGetSize(g_pVDisk, 0 /* base */);
1416
1417	if (g_vboximgOpts.fList)
1418	{
1419	if (g_pVDisk == NULL)
1420	return RTMsgErrorExitFailure("No valid --image to list partitions from\n");
1421
1422	RTPrintf("\n");
1423	rc = parsePartitionTable();
1424	switch(rc)
1425	{
1426	case PARTITION_TABLE_MBR:
1427	displayLegacyPartitionTable();
1428	break;
1429	case PARTITION_TABLE_GPT:
1430	displayGptPartitionTable();
1431	break;
1432	default:
1433	return rc;
1434	}
1435	return 0;
1436	}
1437
1438	if (g_vboximgOpts.idxPartition >= 0)
1439	{
1440	if (g_vboximgOpts.offset)
1441	return RTMsgErrorExitFailure("--offset and --partition are mutually exclusive options\n");
1442
1443	if (g_vboximgOpts.size)
1444	return RTMsgErrorExitFailure("--size and --partition are mutually exclusive options\n");
1445
1446	/*
1447	* --partition option specified. That will set the global offset and limit
1448	* honored by the disk read and write sanitizers to constrain operations
1449	* to within the specified partion based on an initial parsing of the MBR
1450	*/
1451	rc = parsePartitionTable();
1452	if (rc < 0)
1453	return RTMsgErrorExitFailure("Error parsing disk MBR/Partition table\n");
1454	int partNbr = g_vboximgOpts.idxPartition;
1455
1456	if (partNbr < 0 \|\| partNbr > g_lastPartNbr)
1457	return RTMsgErrorExitFailure("Non-valid partition number specified\n");
1458	if (partNbr == 0)
1459	{
1460	g_vDiskOffset = 0;
1461	g_vDiskSize = VDGetSize(g_pVDisk, 0);
1462	if (VERBOSE)
1463	RTPrintf("\nPartition 0 specified - Whole disk will be accessible\n");
1464	} else {
1465	int fFoundPartition = false;
1466	for (int i = 1; i < g_lastPartNbr + 1; i++)
1467	{
1468	/* If GPT, display vboximg's representation of partition table starts at partition 2
1469	* but the table is displayed calling it partition 1, because the protective MBR
1470	* record is relatively pointless to display or reference in this context */
1471	if (g_aParsedPartitionInfo[i].idxPartition == partNbr + (g_fGPT ? 1 : 0))
1472	{
1473	fFoundPartition = true;
1474	g_vDiskOffset = g_aParsedPartitionInfo[i].offPartition;
1475	g_vDiskSize = g_vDiskOffset + g_aParsedPartitionInfo[i].cbPartition;
1476	if (VERBOSE)
1477	RTPrintf("\nPartition %d specified. Only sectors %llu to %llu of disk will be accessible\n",
1478	g_vboximgOpts.idxPartition, g_vDiskOffset / BLOCKSIZE, g_vDiskSize / BLOCKSIZE);
1479	}
1480	}
1481	if (!fFoundPartition)
1482	return RTMsgErrorExitFailure("Couldn't find partition %d in partition table\n", partNbr);
1483	}
1484	} else {
1485	if (g_vboximgOpts.offset) {
1486	if (g_vboximgOpts.offset < 0 \|\| g_vboximgOpts.offset + g_vboximgOpts.size > g_cbEntireVDisk)
1487	return RTMsgErrorExitFailure("User specified offset out of range of virtual disk\n");
1488
1489	if (VERBOSE)
1490	RTPrintf("Setting r/w bias (offset) to user requested value for sector %llu\n", g_vDiskOffset / BLOCKSIZE);
1491
1492	g_vDiskOffset = g_vboximgOpts.offset;
1493	}
1494	if (g_vboximgOpts.size) {
1495	if (g_vboximgOpts.size < 0 \|\| g_vboximgOpts.offset + g_vboximgOpts.size > g_cbEntireVDisk)
1496	return RTMsgErrorExitFailure("User specified size out of range of virtual disk\n");
1497
1498	if (VERBOSE)
1499	RTPrintf("Setting r/w size limit to user requested value %llu\n", g_vDiskSize / BLOCKSIZE);
1500
1501	g_vDiskSize = g_vboximgOpts.size;
1502	}
1503	}
1504	if (g_vDiskSize == 0)
1505	g_vDiskSize = g_cbEntireVDisk - g_vDiskOffset;
1506
1507	/*
1508	* Hand control over to libfuse.
1509	*/
1510	if (VERBOSE)
1511	RTPrintf("\nvboximg-mount: Going into background...\n");
1512
1513	rc = fuse_main(args.argc, args.argv, &g_vboximgOps, NULL);
1514
1515	int rc2 = VDClose(g_pVDisk, false /* fDelete */);
1516	AssertRC(rc2);
1517	RTPrintf("vboximg-mount: fuse_main -> %d\n", rc);
1518	return rc;
1519	}
1520

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source: vbox/trunk/src/VBox/ImageMounter/vboximg-mount/vboximg-mount.cpp@ 78387

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