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 | #include "libsaio.h"␊ |
26 | #include "sl.h"␊ |
27 | ␊ |
28 | //#define BYTE_ORDER_MARK␉0xFEFF␊ |
29 | ␊ |
30 | #include "ntfs_private.h"␊ |
31 | ␊ |
32 | //#define FS_TYPE␉␉␉"ntfs"␊ |
33 | //#define FS_NAME_FILE␉␉"NTFS"␊ |
34 | ␊ |
35 | #define MAX_BLOCK_SIZE␉␉2048␊ |
36 | #define MAX_CLUSTER_SIZE␉32768␊ |
37 | ␊ |
38 | //#define LABEL_LENGTH␉1024␊ |
39 | //#define UNKNOWN_LABEL␉"Untitled NTFS"␊ |
40 | ␊ |
41 | //#define FSUR_IO_FAIL -1␊ |
42 | //#define FSUR_UNRECOGNIZED -1␊ |
43 | //#define FSUR_RECOGNIZED 0␊ |
44 | ␊ |
45 | #define ERROR -1␊ |
46 | static int␊ |
47 | ntfs_fixup(␊ |
48 | ␉␉ char *buf,␊ |
49 | ␉␉ size_t len,␊ |
50 | ␉␉ u_int32_t magic,␊ |
51 | ␉␉ u_int32_t bytesPerSector);␊ |
52 | static int␊ |
53 | ntfs_find_attr(␊ |
54 | ␉␉␉ char *buf,␊ |
55 | ␉␉␉ u_int32_t attrType,␊ |
56 | ␉␉␉ void **attrData,␊ |
57 | ␉␉␉ size_t *attrSize);␊ |
58 | /*␊ |
59 | * Process per-sector "fixups" that NTFS uses to detect corruption of␊ |
60 | * multi-sector data structures, like MFT records.␊ |
61 | */␊ |
62 | static int␊ |
63 | ntfs_fixup(␊ |
64 | char *buf,␊ |
65 | size_t len,␊ |
66 | u_int32_t magic,␊ |
67 | u_int32_t bytesPerSector)␊ |
68 | {␊ |
69 | ␉struct fixuphdr *fhp = (struct fixuphdr *) buf;␊ |
70 | ␉int i;␊ |
71 | ␉u_int16_t fixup;␊ |
72 | ␉u_int16_t *fxp;␊ |
73 | ␉u_int16_t *cfxp;␊ |
74 | u_int32_t␉fixup_magic;␊ |
75 | u_int16_t␉fixup_count;␊ |
76 | u_int16_t␉fixup_offset;␊ |
77 | ␊ |
78 | fixup_magic = OSReadLittleInt32(&fhp->fh_magic,0);␊ |
79 | ␉if (fixup_magic != magic) {␊ |
80 | ␉␉error("ntfs_fixup: magic doesn't match: %08x != %08x\n",␊ |
81 | ␉␉ fixup_magic, magic);␊ |
82 | ␉␉return (ERROR);␊ |
83 | ␉}␊ |
84 | fixup_count = OSReadLittleInt16(&fhp->fh_fnum,0);␊ |
85 | ␉if ((fixup_count - 1) * bytesPerSector != len) {␊ |
86 | ␉␉error("ntfs_fixup: " \␊ |
87 | ␉␉ "bad fixups number: %d for %ld bytes block\n", ␊ |
88 | ␉␉ fixup_count, (long)len);␉/* XXX printf kludge */␊ |
89 | ␉␉return (ERROR);␊ |
90 | ␉}␊ |
91 | fixup_offset = OSReadLittleInt16(&fhp->fh_foff,0);␊ |
92 | ␉if (fixup_offset >= len) {␊ |
93 | ␉␉error("ntfs_fixup: invalid offset: %x", fixup_offset);␊ |
94 | ␉␉return (ERROR);␊ |
95 | ␉}␊ |
96 | ␉fxp = (u_int16_t *) (buf + fixup_offset);␊ |
97 | ␉cfxp = (u_int16_t *) (buf + bytesPerSector - 2);␊ |
98 | ␉fixup = *fxp++;␊ |
99 | ␉for (i = 1; i < fixup_count; i++, fxp++) {␊ |
100 | ␉␉if (*cfxp != fixup) {␊ |
101 | ␉␉␉error("ntfs_fixup: fixup %d doesn't match\n", i);␊ |
102 | ␉␉␉return (ERROR);␊ |
103 | ␉␉}␊ |
104 | ␉␉*cfxp = *fxp;␊ |
105 | cfxp = (u_int16_t *)(((caddr_t)cfxp) + bytesPerSector);␊ |
106 | ␉}␊ |
107 | ␉return (0);␊ |
108 | }␊ |
109 | ␊ |
110 | /*␊ |
111 | * Find a resident attribute of a given type. Returns a pointer to the␊ |
112 | * attribute data, and its size in bytes.␊ |
113 | */␊ |
114 | static int␊ |
115 | ntfs_find_attr(␊ |
116 | char *buf,␊ |
117 | u_int32_t attrType,␊ |
118 | void **attrData,␊ |
119 | size_t *attrSize)␊ |
120 | {␊ |
121 | struct filerec *filerec;␊ |
122 | struct attr *attr;␊ |
123 | u_int16_t offset;␊ |
124 | ␊ |
125 | filerec = (struct filerec *) buf;␊ |
126 | offset = OSReadLittleInt16(&filerec->fr_attroff,0);␊ |
127 | attr = (struct attr *) (buf + offset);␊ |
128 | ␊ |
129 | |
130 | while (attr->a_hdr.a_type != 0xFFFFFFFF)␉/* same for big/little endian */␊ |
131 | {␊ |
132 | if (OSReadLittleInt32(&attr->a_hdr.a_type,0) == attrType)␊ |
133 | {␊ |
134 | if (attr->a_hdr.a_flag != 0)␊ |
135 | {␊ |
136 | //verbose("NTFS: attriubte 0x%X is non-resident\n", attrType);␊ |
137 | return 1;␊ |
138 | }␊ |
139 | ␊ |
140 | *attrSize = OSReadLittleInt16(&attr->a_r.a_datalen,0);␊ |
141 | *attrData = buf + offset + OSReadLittleInt16(&attr->a_r.a_dataoff,0);␊ |
142 | return 0;␉/* found it! */␊ |
143 | }␊ |
144 | ␊ |
145 | /* Skip to the next attribute */␊ |
146 | offset += OSReadLittleInt32(&attr->a_hdr.reclen,0);␊ |
147 | attr = (struct attr *) (buf + offset);␊ |
148 | }␊ |
149 | ␊ |
150 | return 1;␉/* No matching attrType found */␊ |
151 | }␊ |
152 | ␊ |
153 | /*␊ |
154 | * Examine a volume to see if we recognize it as a mountable.␊ |
155 | */␊ |
156 | void␊ |
157 | NTFSGetDescription(CICell ih, char *str, long strMaxLen)␊ |
158 | {␊ |
159 | struct bootfile *boot;␊ |
160 | unsigned bytesPerSector;␊ |
161 | unsigned sectorsPerCluster;␊ |
162 | int mftRecordSize;␊ |
163 | u_int64_t totalClusters;␊ |
164 | u_int64_t cluster, mftCluster;␊ |
165 | size_t mftOffset;␊ |
166 | void *nameAttr;␊ |
167 | size_t nameSize;␊ |
168 | char *buf;␊ |
169 | ␊ |
170 | buf = (char *)malloc(MAX_CLUSTER_SIZE);␊ |
171 | if (buf == 0) {␊ |
172 | goto error;␊ |
173 | }␊ |
174 | ␊ |
175 | /*␊ |
176 | * Read the boot sector, check signatures, and do some minimal␊ |
177 | * sanity checking. NOTE: the size of the read below is intended␊ |
178 | * to be a multiple of all supported block sizes, so we don't␊ |
179 | * have to determine or change the device's block size.␊ |
180 | */␊ |
181 | Seek(ih, 0);␊ |
182 | Read(ih, (long)buf, MAX_BLOCK_SIZE);␊ |
183 | ␊ |
184 | boot = (struct bootfile *) buf;␊ |
185 | ␊ |
186 | /*␊ |
187 | * The first three bytes are an Intel x86 jump instruction. I assume it␊ |
188 | * can be the same forms as DOS FAT:␊ |
189 | * 0xE9 0x?? 0x??␊ |
190 | * 0xEC 0x?? 0x90␊ |
191 | * where 0x?? means any byte value is OK.␊ |
192 | */␊ |
193 | if (boot->reserved1[0] != 0xE9␊ |
194 | && (boot->reserved1[0] != 0xEB || boot->reserved1[2] != 0x90))␊ |
195 | {␊ |
196 | goto error;␊ |
197 | }␊ |
198 | ␊ |
199 | /*␊ |
200 | * Check the "NTFS " signature.␊ |
201 | */␊ |
202 | if (memcmp((const char *)boot->bf_sysid, "NTFS ", 8) != 0)␊ |
203 | {␊ |
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 | {␊ |
275 | //verbose("NTFS: error reading MFT $Volume record: %s\n",␊ |
276 | strerror(errno));␊ |
277 | goto error;␊ |
278 | }␊ |
279 | #endif␊ |
280 | ␊ |
281 | if (ntfs_fixup(buf, mftRecordSize, NTFS_FILEMAGIC, bytesPerSector) != 0)␊ |
282 | {␊ |
283 | //verbose("NTFS: block fixup failed\n");␊ |
284 | goto error;␊ |
285 | }␊ |
286 | ␊ |
287 | /*␊ |
288 | * Loop over the attributes, looking for $VOLUME_NAME (0x60).␊ |
289 | */␊ |
290 | if(ntfs_find_attr(buf, NTFS_A_VOLUMENAME, &nameAttr, &nameSize) != 0)␊ |
291 | {␊ |
292 | //verbose("NTFS: $VOLUME_NAME attribute not found\n");␊ |
293 | goto error;␊ |
294 | }␊ |
295 | ␊ |
296 | str[0] = '\0';␊ |
297 | ␊ |
298 | utf_encodestr( nameAttr, nameSize / 2, (u_int8_t *)str, strMaxLen, OSLittleEndian );␊ |
299 | ␊ |
300 | free(buf);␊ |
301 | return;␊ |
302 | ␊ |
303 | error:␊ |
304 | if (buf) free(buf);␊ |
305 | return;␊ |
306 | }␊ |
307 | ␊ |
308 | long NTFSGetUUID(CICell ih, char *uuidStr)␊ |
309 | {␊ |
310 | ␉bool NTFSProbe(const void*);␊ |
311 | ␊ |
312 | ␉struct bootfile *boot;␊ |
313 | ␉void *buf = malloc(MAX_BLOCK_SIZE);␊ |
314 | ␉if ( !buf )␊ |
315 | ␉␉return -1;␊ |
316 | ␊ |
317 | ␉/*␊ |
318 | ␉ * Read the boot sector, check signatures, and do some minimal␊ |
319 | ␉ * sanity checking.␉ NOTE: the size of the read below is intended␊ |
320 | ␉ * to be a multiple of all supported block sizes, so we don't␊ |
321 | ␉ * have to determine or change the device's block size.␊ |
322 | ␉ */␊ |
323 | ␉Seek(ih, 0);␊ |
324 | ␉Read(ih, (long)buf, MAX_BLOCK_SIZE);␊ |
325 | ␊ |
326 | ␉boot = (struct bootfile *) buf;␊ |
327 | ␊ |
328 | ␉// Check for NTFS signature␊ |
329 | ␉if ( memcmp((void*)boot->bf_sysid, NTFS_BBID, NTFS_BBIDLEN) != 0 )␊ |
330 | ␉␉return -1;␊ |
331 | ␊ |
332 | ␉// Check for non-null volume serial number␊ |
333 | ␉if( !boot->bf_volsn )␊ |
334 | ␉␉return -1;␊ |
335 | ␊ |
336 | ␉// Use UUID like the one you get on Windows␊ |
337 | ␉sprintf(uuidStr, "%04X-%04X",␉(unsigned short)(boot->bf_volsn >> 16) & 0xFFFF,␊ |
338 | ␉␉␉␉␉␉␉␉␉(unsigned short)boot->bf_volsn & 0xFFFF);␊ |
339 | ␊ |
340 | ␉return 0;␊ |
341 | } ␊ |
342 | ␊ |
343 | bool NTFSProbe(const void * buffer)␊ |
344 | {␊ |
345 | ␉bool result = false;␊ |
346 | ␉␊ |
347 | ␉const struct bootfile␉* part_bootfile = buffer;␉␉␉// NTFS boot sector structure␊ |
348 | ␉␊ |
349 | ␉// Looking for NTFS signature.␊ |
350 | ␉if (strncmp((const char *)part_bootfile->bf_sysid, NTFS_BBID, NTFS_BBIDLEN) == 0)␊ |
351 | ␉␉result = true;␊ |
352 | ␉␊ |
353 | ␉return result;␊ |
354 | }␊ |
355 | |