1 | /*␊ |
2 | * Copyright (c) 2004 Apple Computer, Inc. All rights reserved.␊ |
3 | *␊ |
4 | * @APPLE_LICENSE_HEADER_START@␊ |
5 | * ␊ |
6 | * Copyright (c) 1999-2004 Apple Computer, Inc. All Rights Reserved.␊ |
7 | * ␊ |
8 | * This file contains Original Code and/or Modifications of Original Code␊ |
9 | * as defined in and that are subject to the Apple Public Source License␊ |
10 | * Version 2.0 (the 'License'). You may not use this file except in␊ |
11 | * compliance with the License. Please obtain a copy of the License at␊ |
12 | * http://www.opensource.apple.com/apsl/ and read it before using this␊ |
13 | * file.␊ |
14 | * ␊ |
15 | * The Original Code and all software distributed under the License are␊ |
16 | * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER␊ |
17 | * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,␊ |
18 | * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,␊ |
19 | * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.␊ |
20 | * Please see the License for the specific language governing rights and␊ |
21 | * limitations under the License.␊ |
22 | * ␊ |
23 | * @APPLE_LICENSE_HEADER_END@␊ |
24 | */␊ |
25 | ␊ |
26 | #include "libsaio.h"␊ |
27 | #include "sl.h"␊ |
28 | ␊ |
29 | /*␊ |
30 | * dmazar, 14/7/2011 - support for EXFAT volume label reading␊ |
31 | */␊ |
32 | #include "exfat.h"␊ |
33 | ␊ |
34 | #define BYTE_ORDER_MARK␉0xFEFF␊ |
35 | ␊ |
36 | #include "ntfs_private.h"␊ |
37 | ␊ |
38 | #define FS_TYPE␉␉␉"ntfs"␊ |
39 | #define FS_NAME_FILE␉␉"NTFS"␊ |
40 | ␊ |
41 | #define MAX_BLOCK_SIZE␉␉2048␊ |
42 | #define MAX_CLUSTER_SIZE␉32768␊ |
43 | ␊ |
44 | #define LABEL_LENGTH␉1024␊ |
45 | #define UNKNOWN_LABEL␉"Untitled NTFS"␊ |
46 | ␊ |
47 | #define FSUR_IO_FAIL -1␊ |
48 | #define FSUR_UNRECOGNIZED -1␊ |
49 | #define FSUR_RECOGNIZED 0␊ |
50 | ␊ |
51 | #define ERROR -1␊ |
52 | ␊ |
53 | /*␊ |
54 | * Process per-sector "fixups" that NTFS uses to detect corruption of␊ |
55 | * multi-sector data structures, like MFT records.␊ |
56 | */␊ |
57 | static int␊ |
58 | ntfs_fixup(␊ |
59 | char *buf,␊ |
60 | size_t len,␊ |
61 | u_int32_t magic,␊ |
62 | u_int32_t bytesPerSector)␊ |
63 | {␊ |
64 | ␉struct fixuphdr *fhp = (struct fixuphdr *) buf;␊ |
65 | ␉int i;␊ |
66 | ␉u_int16_t fixup;␊ |
67 | ␉u_int16_t *fxp;␊ |
68 | ␉u_int16_t *cfxp;␊ |
69 | u_int32_t␉fixup_magic;␊ |
70 | u_int16_t␉fixup_count;␊ |
71 | u_int16_t␉fixup_offset;␊ |
72 | ␊ |
73 | fixup_magic = OSReadLittleInt32(&fhp->fh_magic,0);␊ |
74 | ␉if (fixup_magic != magic) {␊ |
75 | ␉␉error("ntfs_fixup: magic doesn't match: %08x != %08x\n",␊ |
76 | ␉␉ fixup_magic, magic);␊ |
77 | ␉␉return (ERROR);␊ |
78 | ␉}␊ |
79 | fixup_count = OSReadLittleInt16(&fhp->fh_fnum,0);␊ |
80 | ␉if ((fixup_count - 1) * bytesPerSector != len) {␊ |
81 | ␉␉error("ntfs_fixup: " \␊ |
82 | ␉␉ "bad fixups number: %d for %ld bytes block\n", ␊ |
83 | ␉␉ fixup_count, (long)len);␉/* XXX printf kludge */␊ |
84 | ␉␉return (ERROR);␊ |
85 | ␉}␊ |
86 | fixup_offset = OSReadLittleInt16(&fhp->fh_foff,0);␊ |
87 | ␉if (fixup_offset >= len) {␊ |
88 | ␉␉error("ntfs_fixup: invalid offset: %x", fixup_offset);␊ |
89 | ␉␉return (ERROR);␊ |
90 | ␉}␊ |
91 | ␉fxp = (u_int16_t *) (buf + fixup_offset);␊ |
92 | ␉cfxp = (u_int16_t *) (buf + bytesPerSector - 2);␊ |
93 | ␉fixup = *fxp++;␊ |
94 | ␉for (i = 1; i < fixup_count; i++, fxp++) {␊ |
95 | ␉␉if (*cfxp != fixup) {␊ |
96 | ␉␉␉error("ntfs_fixup: fixup %d doesn't match\n", i);␊ |
97 | ␉␉␉return (ERROR);␊ |
98 | ␉␉}␊ |
99 | ␉␉*cfxp = *fxp;␊ |
100 | cfxp = (u_int16_t *)(((caddr_t)cfxp) + bytesPerSector);␊ |
101 | ␉}␊ |
102 | ␉return (0);␊ |
103 | }␊ |
104 | ␊ |
105 | /*␊ |
106 | * Find a resident attribute of a given type. Returns a pointer to the␊ |
107 | * attribute data, and its size in bytes.␊ |
108 | */␊ |
109 | static int␊ |
110 | ntfs_find_attr(␊ |
111 | char *buf,␊ |
112 | u_int32_t attrType,␊ |
113 | void **attrData,␊ |
114 | size_t *attrSize)␊ |
115 | {␊ |
116 | struct filerec *filerec;␊ |
117 | struct attr *attr;␊ |
118 | u_int16_t offset;␊ |
119 | ␊ |
120 | filerec = (struct filerec *) buf;␊ |
121 | offset = OSReadLittleInt16(&filerec->fr_attroff,0);␊ |
122 | attr = (struct attr *) (buf + offset);␊ |
123 | ␊ |
124 | |
125 | while (attr->a_hdr.a_type != 0xFFFFFFFF)␉/* same for big/little endian */␊ |
126 | {␊ |
127 | if (OSReadLittleInt32(&attr->a_hdr.a_type,0) == attrType)␊ |
128 | {␊ |
129 | if (attr->a_hdr.a_flag != 0)␊ |
130 | {␊ |
131 | //verbose("NTFS: attriubte 0x%X is non-resident\n", attrType);␊ |
132 | return 1;␊ |
133 | }␊ |
134 | ␊ |
135 | *attrSize = OSReadLittleInt16(&attr->a_r.a_datalen,0);␊ |
136 | *attrData = buf + offset + OSReadLittleInt16(&attr->a_r.a_dataoff,0);␊ |
137 | return 0;␉/* found it! */␊ |
138 | }␊ |
139 | ␊ |
140 | /* Skip to the next attribute */␊ |
141 | offset += OSReadLittleInt32(&attr->a_hdr.reclen,0);␊ |
142 | attr = (struct attr *) (buf + offset);␊ |
143 | }␊ |
144 | ␊ |
145 | return 1;␉/* No matching attrType found */␊ |
146 | }␊ |
147 | ␊ |
148 | /*␊ |
149 | * Examine a volume to see if we recognize it as a mountable.␊ |
150 | */␊ |
151 | void␊ |
152 | NTFSGetDescription(CICell ih, char *str, long strMaxLen)␊ |
153 | {␊ |
154 | struct bootfile *boot;␊ |
155 | unsigned bytesPerSector;␊ |
156 | unsigned sectorsPerCluster;␊ |
157 | int mftRecordSize;␊ |
158 | u_int64_t totalClusters;␊ |
159 | u_int64_t cluster, mftCluster;␊ |
160 | size_t mftOffset;␊ |
161 | void *nameAttr;␊ |
162 | size_t nameSize;␊ |
163 | char *buf;␊ |
164 | ␊ |
165 | buf = (char *)malloc(MAX_CLUSTER_SIZE);␊ |
166 | if (buf == 0) {␊ |
167 | goto error;␊ |
168 | }␊ |
169 | ␊ |
170 | /*␊ |
171 | * Read the boot sector, check signatures, and do some minimal␊ |
172 | * sanity checking. NOTE: the size of the read below is intended␊ |
173 | * to be a multiple of all supported block sizes, so we don't␊ |
174 | * have to determine or change the device's block size.␊ |
175 | */␊ |
176 | Seek(ih, 0);␊ |
177 | Read(ih, (long)buf, MAX_BLOCK_SIZE);␊ |
178 | ␊ |
179 | boot = (struct bootfile *) buf;␊ |
180 | ␊ |
181 | /*␊ |
182 | * The first three bytes are an Intel x86 jump instruction. I assume it␊ |
183 | * can be the same forms as DOS FAT:␊ |
184 | * 0xE9 0x?? 0x??␊ |
185 | * 0xEC 0x?? 0x90␊ |
186 | * where 0x?? means any byte value is OK.␊ |
187 | */␊ |
188 | if (boot->reserved1[0] != 0xE9␊ |
189 | && (boot->reserved1[0] != 0xEB || boot->reserved1[2] != 0x90))␊ |
190 | {␊ |
191 | goto error;␊ |
192 | }␊ |
193 | ␊ |
194 | /*␊ |
195 | * Check the "NTFS " signature.␊ |
196 | */␊ |
197 | if (memcmp((const char *)boot->bf_sysid, "NTFS ", 8) != 0)␊ |
198 | {␊ |
199 | /*␊ |
200 | * Check for EXFAT. Finish by jumping to error to free buf,␊ |
201 | * although if it is EXFAT then it's no an error.␊ |
202 | */␊ |
203 | EXFATGetDescription(ih, str, strMaxLen);␊ |
204 | goto error;␊ |
205 | }␊ |
206 | ␊ |
207 | /*␊ |
208 | * Make sure the bytes per sector and sectors per cluster are␊ |
209 | * powers of two, and within reasonable ranges.␊ |
210 | */␊ |
211 | bytesPerSector = OSReadLittleInt16(&boot->bf_bps,0);␊ |
212 | if ((bytesPerSector & (bytesPerSector-1)) || bytesPerSector < 512 || bytesPerSector > 32768)␊ |
213 | {␊ |
214 | //verbose("NTFS: invalid bytes per sector (%d)\n", bytesPerSector);␊ |
215 | goto error;␊ |
216 | }␊ |
217 | ␊ |
218 | sectorsPerCluster = boot->bf_spc;␉/* Just one byte; no swapping needed */␊ |
219 | if ((sectorsPerCluster & (sectorsPerCluster-1)) || sectorsPerCluster > 128)␊ |
220 | {␊ |
221 | //verbose("NTFS: invalid sectors per cluster (%d)\n", bytesPerSector);␊ |
222 | goto error;␊ |
223 | }␊ |
224 | ␊ |
225 | /*␊ |
226 | * Calculate the number of clusters from the number of sectors.␊ |
227 | * Then bounds check the $MFT and $MFTMirr clusters.␊ |
228 | */␊ |
229 | totalClusters = OSReadLittleInt64(&boot->bf_spv,0) / sectorsPerCluster;␊ |
230 | mftCluster = OSReadLittleInt64(&boot->bf_mftcn,0);␊ |
231 | if (mftCluster > totalClusters)␊ |
232 | {␊ |
233 | ////verbose("NTFS: invalid $MFT cluster (%lld)\n", mftCluster);␊ |
234 | goto error;␊ |
235 | }␊ |
236 | cluster = OSReadLittleInt64(&boot->bf_mftmirrcn,0);␊ |
237 | if (cluster > totalClusters)␊ |
238 | {␊ |
239 | //verbose("NTFS: invalid $MFTMirr cluster (%lld)\n", cluster);␊ |
240 | goto error;␊ |
241 | }␊ |
242 | ␊ |
243 | /*␊ |
244 | * Determine the size of an MFT record.␊ |
245 | */␊ |
246 | mftRecordSize = (int8_t) boot->bf_mftrecsz;␊ |
247 | if (mftRecordSize < 0)␊ |
248 | mftRecordSize = 1 << -mftRecordSize;␊ |
249 | else␊ |
250 | mftRecordSize *= bytesPerSector * sectorsPerCluster;␊ |
251 | //verbose("NTFS: MFT record size = %d\n", mftRecordSize);␊ |
252 | ␊ |
253 | /*␊ |
254 | * Read the MFT record for $Volume. This assumes the first four␊ |
255 | * file records in the MFT are contiguous; if they aren't, we␊ |
256 | * would have to map the $MFT itself.␊ |
257 | *␊ |
258 | * This will fail if the device sector size is larger than the␊ |
259 | * MFT record size, since the $Volume record won't be aligned␊ |
260 | * on a sector boundary.␊ |
261 | */␊ |
262 | mftOffset = mftCluster * sectorsPerCluster * bytesPerSector;␊ |
263 | mftOffset += mftRecordSize * NTFS_VOLUMEINO;␊ |
264 | ␊ |
265 | Seek(ih, mftOffset);␊ |
266 | Read(ih, (long)buf, mftRecordSize);␊ |
267 | #if UNUSED␊ |
268 | if (lseek(fd, mftOffset, SEEK_SET) == -1)␊ |
269 | {␊ |
270 | //verbose("NTFS: lseek to $Volume failed: %s\n", strerror(errno));␊ |
271 | goto error;␊ |
272 | }␊ |
273 | if (read(fd, buf, mftRecordSize) != mftRecordSize) {␊ |
274 | //verbose("NTFS: error reading MFT $Volume record: %s\n", strerror(errno));␊ |
275 | goto error;␊ |
276 | }␊ |
277 | #endif␊ |
278 | ␊ |
279 | if (ntfs_fixup(buf, mftRecordSize, NTFS_FILEMAGIC, bytesPerSector) != 0) {␊ |
280 | //verbose("NTFS: block fixup failed\n");␊ |
281 | goto error;␊ |
282 | }␊ |
283 | ␊ |
284 | /*␊ |
285 | * Loop over the attributes, looking for $VOLUME_NAME (0x60).␊ |
286 | */␊ |
287 | if(ntfs_find_attr(buf, NTFS_A_VOLUMENAME, &nameAttr, &nameSize) != 0)␊ |
288 | {␊ |
289 | //verbose("NTFS: $VOLUME_NAME attribute not found\n");␊ |
290 | goto error;␊ |
291 | }␊ |
292 | ␊ |
293 | str[0] = '\0';␊ |
294 | ␊ |
295 | utf_encodestr( nameAttr, nameSize / 2, (u_int8_t *)str, strMaxLen, OSLittleEndian );␊ |
296 | ␊ |
297 | free(buf);␊ |
298 | return;␊ |
299 | ␊ |
300 | error:␊ |
301 | if (buf) free(buf);␊ |
302 | return;␊ |
303 | }␊ |
304 | ␊ |
305 | long NTFSGetUUID(CICell ih, char *uuidStr)␊ |
306 | {␊ |
307 | ␉bool NTFSProbe(const void*);␊ |
308 | ␊ |
309 | ␉struct bootfile *boot;␊ |
310 | ␉void *buf = malloc(MAX_BLOCK_SIZE);␊ |
311 | ␉if ( !buf ) {␊ |
312 | ␉␉return -1;␊ |
313 | ␉}␊ |
314 | ␊ |
315 | ␉/*␊ |
316 | ␉ * Read the boot sector, check signatures, and do some minimal␊ |
317 | ␉ * sanity checking.␉ NOTE: the size of the read below is intended␊ |
318 | ␉ * to be a multiple of all supported block sizes, so we don't␊ |
319 | ␉ * have to determine or change the device's block size.␊ |
320 | ␉ */␊ |
321 | ␉Seek(ih, 0);␊ |
322 | ␉Read(ih, (long)buf, MAX_BLOCK_SIZE);␊ |
323 | ␊ |
324 | ␉boot = (struct bootfile *) buf;␊ |
325 | ␊ |
326 | ␉// Check for NTFS signature␊ |
327 | ␉if ( memcmp((void*)boot->bf_sysid, NTFS_BBID, NTFS_BBIDLEN) != 0 ) {␊ |
328 | ␉␉// If not NTFS, maybe it is EXFAT␊ |
329 | ␉␉return EXFATGetUUID(ih, uuidStr);␊ |
330 | ␉}␊ |
331 | ␊ |
332 | ␉// Check for non-null volume serial number␊ |
333 | ␉if( !boot->bf_volsn ) {␊ |
334 | ␉␉return -1;␊ |
335 | ␉}␊ |
336 | ␊ |
337 | ␉// Use UUID like the one you get on Windows␊ |
338 | ␉sprintf(uuidStr, "%04X-%04X",␉(unsigned short)(boot->bf_volsn >> 16) & 0xFFFF,␊ |
339 | ␉␉␉␉␉␉␉␉␉(unsigned short)boot->bf_volsn & 0xFFFF);␊ |
340 | ␊ |
341 | ␉return 0;␊ |
342 | }␊ |
343 | ␊ |
344 | bool NTFSProbe(const void * buffer)␊ |
345 | {␊ |
346 | ␉bool result = false;␊ |
347 | ␊ |
348 | ␉const struct bootfile␉* part_bootfile = buffer;␉␉␉// NTFS boot sector structure␊ |
349 | ␊ |
350 | ␉// Looking for NTFS signature.␊ |
351 | ␉if (strncmp((const char *)part_bootfile->bf_sysid, NTFS_BBID, NTFS_BBIDLEN) == 0)␊ |
352 | ␉␉result = true;␊ |
353 | ␊ |
354 | ␉// If not NTFS, maybe it is EXFAT␊ |
355 | ␉if (!result)␊ |
356 | ␉␉result = EXFATProbe(buffer);␊ |
357 | ␊ |
358 | ␉return result;␊ |
359 | }␊ |
360 | |