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 | ␊ |
47 | /*␊ |
48 | * Process per-sector "fixups" that NTFS uses to detect corruption of␊ |
49 | * multi-sector data structures, like MFT records.␊ |
50 | */␊ |
51 | static int␊ |
52 | ntfs_fixup(␊ |
53 | char *buf,␊ |
54 | size_t len,␊ |
55 | u_int32_t magic,␊ |
56 | u_int32_t bytesPerSector)␊ |
57 | {␊ |
58 | ␉struct fixuphdr *fhp = (struct fixuphdr *) buf;␊ |
59 | ␉int i;␊ |
60 | ␉u_int16_t fixup;␊ |
61 | ␉u_int16_t *fxp;␊ |
62 | ␉u_int16_t *cfxp;␊ |
63 | u_int32_t␉fixup_magic;␊ |
64 | u_int16_t␉fixup_count;␊ |
65 | u_int16_t␉fixup_offset;␊ |
66 | ␊ |
67 | fixup_magic = OSReadLittleInt32(&fhp->fh_magic,0);␊ |
68 | ␉if (fixup_magic != magic) {␊ |
69 | ␉␉error("ntfs_fixup: magic doesn't match: %08x != %08x\n",␊ |
70 | ␉␉ fixup_magic, magic);␊ |
71 | ␉␉return (ERROR);␊ |
72 | ␉}␊ |
73 | fixup_count = OSReadLittleInt16(&fhp->fh_fnum,0);␊ |
74 | ␉if ((fixup_count - 1) * bytesPerSector != len) {␊ |
75 | ␉␉error("ntfs_fixup: " \␊ |
76 | ␉␉ "bad fixups number: %d for %ld bytes block\n", ␊ |
77 | ␉␉ fixup_count, (long)len);␉/* XXX printf kludge */␊ |
78 | ␉␉return (ERROR);␊ |
79 | ␉}␊ |
80 | fixup_offset = OSReadLittleInt16(&fhp->fh_foff,0);␊ |
81 | ␉if (fixup_offset >= len) {␊ |
82 | ␉␉error("ntfs_fixup: invalid offset: %x", fixup_offset);␊ |
83 | ␉␉return (ERROR);␊ |
84 | ␉}␊ |
85 | ␉fxp = (u_int16_t *) (buf + fixup_offset);␊ |
86 | ␉cfxp = (u_int16_t *) (buf + bytesPerSector - 2);␊ |
87 | ␉fixup = *fxp++;␊ |
88 | ␉for (i = 1; i < fixup_count; i++, fxp++) {␊ |
89 | ␉␉if (*cfxp != fixup) {␊ |
90 | ␉␉␉error("ntfs_fixup: fixup %d doesn't match\n", i);␊ |
91 | ␉␉␉return (ERROR);␊ |
92 | ␉␉}␊ |
93 | ␉␉*cfxp = *fxp;␊ |
94 | cfxp = (u_int16_t *)(((caddr_t)cfxp) + bytesPerSector);␊ |
95 | ␉}␊ |
96 | ␉return (0);␊ |
97 | }␊ |
98 | ␊ |
99 | /*␊ |
100 | * Find a resident attribute of a given type. Returns a pointer to the␊ |
101 | * attribute data, and its size in bytes.␊ |
102 | */␊ |
103 | static int␊ |
104 | ntfs_find_attr(␊ |
105 | char *buf,␊ |
106 | u_int32_t attrType,␊ |
107 | void **attrData,␊ |
108 | size_t *attrSize)␊ |
109 | {␊ |
110 | struct filerec *filerec;␊ |
111 | struct attr *attr;␊ |
112 | u_int16_t offset;␊ |
113 | ␊ |
114 | filerec = (struct filerec *) buf;␊ |
115 | offset = OSReadLittleInt16(&filerec->fr_attroff,0);␊ |
116 | attr = (struct attr *) (buf + offset);␊ |
117 | ␊ |
118 | |
119 | while (attr->a_hdr.a_type != 0xFFFFFFFF)␉/* same for big/little endian */␊ |
120 | {␊ |
121 | if (OSReadLittleInt32(&attr->a_hdr.a_type,0) == attrType)␊ |
122 | {␊ |
123 | if (attr->a_hdr.a_flag != 0)␊ |
124 | {␊ |
125 | //verbose("NTFS: attriubte 0x%X is non-resident\n", attrType);␊ |
126 | return 1;␊ |
127 | }␊ |
128 | ␊ |
129 | *attrSize = OSReadLittleInt16(&attr->a_r.a_datalen,0);␊ |
130 | *attrData = buf + offset + OSReadLittleInt16(&attr->a_r.a_dataoff,0);␊ |
131 | return 0;␉/* found it! */␊ |
132 | }␊ |
133 | ␊ |
134 | /* Skip to the next attribute */␊ |
135 | offset += OSReadLittleInt32(&attr->a_hdr.reclen,0);␊ |
136 | attr = (struct attr *) (buf + offset);␊ |
137 | }␊ |
138 | ␊ |
139 | return 1;␉/* No matching attrType found */␊ |
140 | }␊ |
141 | ␊ |
142 | /*␊ |
143 | * Examine a volume to see if we recognize it as a mountable.␊ |
144 | */␊ |
145 | void␊ |
146 | NTFSGetDescription(CICell ih, char *str, long strMaxLen)␊ |
147 | {␊ |
148 | struct bootfile *boot;␊ |
149 | unsigned bytesPerSector;␊ |
150 | unsigned sectorsPerCluster;␊ |
151 | int mftRecordSize;␊ |
152 | u_int64_t totalClusters;␊ |
153 | u_int64_t cluster, mftCluster;␊ |
154 | size_t mftOffset;␊ |
155 | void *nameAttr;␊ |
156 | size_t nameSize;␊ |
157 | char *buf;␊ |
158 | ␊ |
159 | buf = (char *)malloc(MAX_CLUSTER_SIZE);␊ |
160 | if (buf == 0) {␊ |
161 | goto error;␊ |
162 | }␊ |
163 | ␊ |
164 | /*␊ |
165 | * Read the boot sector, check signatures, and do some minimal␊ |
166 | * sanity checking. NOTE: the size of the read below is intended␊ |
167 | * to be a multiple of all supported block sizes, so we don't␊ |
168 | * have to determine or change the device's block size.␊ |
169 | */␊ |
170 | Seek(ih, 0);␊ |
171 | Read(ih, (long)buf, MAX_BLOCK_SIZE);␊ |
172 | ␊ |
173 | boot = (struct bootfile *) buf;␊ |
174 | ␊ |
175 | /*␊ |
176 | * The first three bytes are an Intel x86 jump instruction. I assume it␊ |
177 | * can be the same forms as DOS FAT:␊ |
178 | * 0xE9 0x?? 0x??␊ |
179 | * 0xEC 0x?? 0x90␊ |
180 | * where 0x?? means any byte value is OK.␊ |
181 | */␊ |
182 | if (boot->reserved1[0] != 0xE9␊ |
183 | && (boot->reserved1[0] != 0xEB || boot->reserved1[2] != 0x90))␊ |
184 | {␊ |
185 | goto error;␊ |
186 | }␊ |
187 | ␊ |
188 | /*␊ |
189 | * Check the "NTFS " signature.␊ |
190 | */␊ |
191 | if (memcmp((const char *)boot->bf_sysid, "NTFS ", 8) != 0)␊ |
192 | {␊ |
193 | goto error;␊ |
194 | }␊ |
195 | ␊ |
196 | /*␊ |
197 | * Make sure the bytes per sector and sectors per cluster are␊ |
198 | * powers of two, and within reasonable ranges.␊ |
199 | */␊ |
200 | bytesPerSector = OSReadLittleInt16(&boot->bf_bps,0);␊ |
201 | if ((bytesPerSector & (bytesPerSector-1)) || bytesPerSector < 512 || bytesPerSector > 32768)␊ |
202 | {␊ |
203 | //verbose("NTFS: invalid bytes per sector (%d)\n", bytesPerSector);␊ |
204 | goto error;␊ |
205 | }␊ |
206 | ␊ |
207 | sectorsPerCluster = boot->bf_spc;␉/* Just one byte; no swapping needed */␊ |
208 | if ((sectorsPerCluster & (sectorsPerCluster-1)) || sectorsPerCluster > 128)␊ |
209 | {␊ |
210 | //verbose("NTFS: invalid sectors per cluster (%d)\n", bytesPerSector);␊ |
211 | goto error;␊ |
212 | }␊ |
213 | ␊ |
214 | /*␊ |
215 | * Calculate the number of clusters from the number of sectors.␊ |
216 | * Then bounds check the $MFT and $MFTMirr clusters.␊ |
217 | */␊ |
218 | totalClusters = OSReadLittleInt64(&boot->bf_spv,0) / sectorsPerCluster;␊ |
219 | mftCluster = OSReadLittleInt64(&boot->bf_mftcn,0);␊ |
220 | if (mftCluster > totalClusters)␊ |
221 | {␊ |
222 | ////verbose("NTFS: invalid $MFT cluster (%lld)\n", mftCluster);␊ |
223 | goto error;␊ |
224 | }␊ |
225 | cluster = OSReadLittleInt64(&boot->bf_mftmirrcn,0);␊ |
226 | if (cluster > totalClusters)␊ |
227 | {␊ |
228 | //verbose("NTFS: invalid $MFTMirr cluster (%lld)\n", cluster);␊ |
229 | goto error;␊ |
230 | }␊ |
231 | ␊ |
232 | /*␊ |
233 | * Determine the size of an MFT record.␊ |
234 | */␊ |
235 | mftRecordSize = (int8_t) boot->bf_mftrecsz;␊ |
236 | if (mftRecordSize < 0)␊ |
237 | mftRecordSize = 1 << -mftRecordSize;␊ |
238 | else␊ |
239 | mftRecordSize *= bytesPerSector * sectorsPerCluster;␊ |
240 | //verbose("NTFS: MFT record size = %d\n", mftRecordSize);␊ |
241 | ␊ |
242 | /*␊ |
243 | * Read the MFT record for $Volume. This assumes the first four␊ |
244 | * file records in the MFT are contiguous; if they aren't, we␊ |
245 | * would have to map the $MFT itself.␊ |
246 | *␊ |
247 | * This will fail if the device sector size is larger than the␊ |
248 | * MFT record size, since the $Volume record won't be aligned␊ |
249 | * on a sector boundary.␊ |
250 | */␊ |
251 | mftOffset = mftCluster * sectorsPerCluster * bytesPerSector;␊ |
252 | mftOffset += mftRecordSize * NTFS_VOLUMEINO;␊ |
253 | ␊ |
254 | Seek(ih, mftOffset);␊ |
255 | Read(ih, (long)buf, mftRecordSize);␊ |
256 | #if UNUSED␊ |
257 | if (lseek(fd, mftOffset, SEEK_SET) == -1)␊ |
258 | {␊ |
259 | //verbose("NTFS: lseek to $Volume failed: %s\n", strerror(errno));␊ |
260 | goto error;␊ |
261 | }␊ |
262 | if (read(fd, buf, mftRecordSize) != mftRecordSize)␊ |
263 | {␊ |
264 | //verbose("NTFS: error reading MFT $Volume record: %s\n",␊ |
265 | strerror(errno));␊ |
266 | goto error;␊ |
267 | }␊ |
268 | #endif␊ |
269 | ␊ |
270 | if (ntfs_fixup(buf, mftRecordSize, NTFS_FILEMAGIC, bytesPerSector) != 0)␊ |
271 | {␊ |
272 | //verbose("NTFS: block fixup failed\n");␊ |
273 | goto error;␊ |
274 | }␊ |
275 | ␊ |
276 | /*␊ |
277 | * Loop over the attributes, looking for $VOLUME_NAME (0x60).␊ |
278 | */␊ |
279 | if(ntfs_find_attr(buf, NTFS_A_VOLUMENAME, &nameAttr, &nameSize) != 0)␊ |
280 | {␊ |
281 | //verbose("NTFS: $VOLUME_NAME attribute not found\n");␊ |
282 | goto error;␊ |
283 | }␊ |
284 | ␊ |
285 | str[0] = '\0';␊ |
286 | ␊ |
287 | utf_encodestr( nameAttr, nameSize / 2, (u_int8_t *)str, strMaxLen, OSLittleEndian );␊ |
288 | ␊ |
289 | free(buf);␊ |
290 | return;␊ |
291 | ␊ |
292 | error:␊ |
293 | if (buf) free(buf);␊ |
294 | return;␊ |
295 | }␊ |
296 | ␊ |
297 | long NTFSGetUUID(CICell ih, char *uuidStr)␊ |
298 | {␊ |
299 | ␉bool NTFSProbe(const void*);␊ |
300 | ␊ |
301 | ␉struct bootfile *boot;␊ |
302 | ␉void *buf = malloc(MAX_BLOCK_SIZE);␊ |
303 | ␉if ( !buf )␊ |
304 | ␉␉return -1;␊ |
305 | ␊ |
306 | ␉/*␊ |
307 | ␉ * Read the boot sector, check signatures, and do some minimal␊ |
308 | ␉ * sanity checking.␉ NOTE: the size of the read below is intended␊ |
309 | ␉ * to be a multiple of all supported block sizes, so we don't␊ |
310 | ␉ * have to determine or change the device's block size.␊ |
311 | ␉ */␊ |
312 | ␉Seek(ih, 0);␊ |
313 | ␉Read(ih, (long)buf, MAX_BLOCK_SIZE);␊ |
314 | ␊ |
315 | ␉boot = (struct bootfile *) buf;␊ |
316 | ␊ |
317 | ␉// Check for NTFS signature␊ |
318 | ␉if ( memcmp((void*)boot->bf_sysid, NTFS_BBID, NTFS_BBIDLEN) != 0 )␊ |
319 | ␉␉return -1;␊ |
320 | ␊ |
321 | ␉// Check for non-null volume serial number␊ |
322 | ␉if( !boot->bf_volsn )␊ |
323 | ␉␉return -1;␊ |
324 | ␊ |
325 | ␉// Use UUID like the one you get on Windows␊ |
326 | ␉sprintf(uuidStr, "%04X-%04X",␉(unsigned short)(boot->bf_volsn >> 16) & 0xFFFF,␊ |
327 | ␉␉␉␉␉␉␉␉␉(unsigned short)boot->bf_volsn & 0xFFFF);␊ |
328 | ␊ |
329 | ␉return 0;␊ |
330 | } ␊ |
331 | ␊ |
332 | bool NTFSProbe(const void * buffer)␊ |
333 | {␊ |
334 | ␉bool result = false;␊ |
335 | ␉␊ |
336 | ␉const struct bootfile␉* part_bootfile = buffer;␉␉␉// NTFS boot sector structure␊ |
337 | ␉␊ |
338 | ␉// Looking for NTFS signature.␊ |
339 | ␉if (strncmp((const char *)part_bootfile->bf_sysid, NTFS_BBID, NTFS_BBIDLEN) == 0)␊ |
340 | ␉␉result = true;␊ |
341 | ␉␊ |
342 | ␉return result;␊ |
343 | }␊ |
344 | |