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 | #define BYTE_ORDER_MARK␉0xFEFF␊ |
30 | ␊ |
31 | #include "ntfs_private.h"␊ |
32 | ␊ |
33 | #define FS_TYPE␉␉␉"ntfs"␊ |
34 | #define FS_NAME_FILE␉␉"NTFS"␊ |
35 | ␊ |
36 | #define MAX_BLOCK_SIZE␉␉2048␊ |
37 | #define MAX_CLUSTER_SIZE␉32768␊ |
38 | ␊ |
39 | #define LABEL_LENGTH␉1024␊ |
40 | #define UNKNOWN_LABEL␉"Untitled NTFS"␊ |
41 | ␊ |
42 | #define FSUR_IO_FAIL -1␊ |
43 | #define FSUR_UNRECOGNIZED -1␊ |
44 | #define FSUR_RECOGNIZED 0␊ |
45 | ␊ |
46 | #define ERROR -1␊ |
47 | ␊ |
48 | /*␊ |
49 | * Process per-sector "fixups" that NTFS uses to detect corruption of␊ |
50 | * multi-sector data structures, like MFT records.␊ |
51 | */␊ |
52 | static int␊ |
53 | ntfs_fixup(␊ |
54 | char *buf,␊ |
55 | size_t len,␊ |
56 | u_int32_t magic,␊ |
57 | u_int32_t bytesPerSector)␊ |
58 | {␊ |
59 | ␉struct fixuphdr *fhp = (struct fixuphdr *) buf;␊ |
60 | ␉int i;␊ |
61 | ␉u_int16_t fixup;␊ |
62 | ␉u_int16_t *fxp;␊ |
63 | ␉u_int16_t *cfxp;␊ |
64 | u_int32_t␉fixup_magic;␊ |
65 | u_int16_t␉fixup_count;␊ |
66 | u_int16_t␉fixup_offset;␊ |
67 | ␊ |
68 | fixup_magic = OSReadLittleInt32(&fhp->fh_magic,0);␊ |
69 | ␉if (fixup_magic != magic) {␊ |
70 | ␉␉error("ntfs_fixup: magic doesn't match: %08x != %08x\n",␊ |
71 | ␉␉ fixup_magic, magic);␊ |
72 | ␉␉return (ERROR);␊ |
73 | ␉}␊ |
74 | fixup_count = OSReadLittleInt16(&fhp->fh_fnum,0);␊ |
75 | ␉if ((fixup_count - 1) * bytesPerSector != len) {␊ |
76 | ␉␉error("ntfs_fixup: " \␊ |
77 | ␉␉ "bad fixups number: %d for %ld bytes block\n", ␊ |
78 | ␉␉ fixup_count, (long)len);␉/* XXX printf kludge */␊ |
79 | ␉␉return (ERROR);␊ |
80 | ␉}␊ |
81 | fixup_offset = OSReadLittleInt16(&fhp->fh_foff,0);␊ |
82 | ␉if (fixup_offset >= len) {␊ |
83 | ␉␉error("ntfs_fixup: invalid offset: %x", fixup_offset);␊ |
84 | ␉␉return (ERROR);␊ |
85 | ␉}␊ |
86 | ␉fxp = (u_int16_t *) (buf + fixup_offset);␊ |
87 | ␉cfxp = (u_int16_t *) (buf + bytesPerSector - 2);␊ |
88 | ␉fixup = *fxp++;␊ |
89 | ␉for (i = 1; i < fixup_count; i++, fxp++) {␊ |
90 | ␉␉if (*cfxp != fixup) {␊ |
91 | ␉␉␉error("ntfs_fixup: fixup %d doesn't match\n", i);␊ |
92 | ␉␉␉return (ERROR);␊ |
93 | ␉␉}␊ |
94 | ␉␉*cfxp = *fxp;␊ |
95 | cfxp = (u_int16_t *)(((caddr_t)cfxp) + bytesPerSector);␊ |
96 | ␉}␊ |
97 | ␉return (0);␊ |
98 | }␊ |
99 | ␊ |
100 | /*␊ |
101 | * Find a resident attribute of a given type. Returns a pointer to the␊ |
102 | * attribute data, and its size in bytes.␊ |
103 | */␊ |
104 | static int␊ |
105 | ntfs_find_attr(␊ |
106 | char *buf,␊ |
107 | u_int32_t attrType,␊ |
108 | void **attrData,␊ |
109 | size_t *attrSize)␊ |
110 | {␊ |
111 | struct filerec *filerec;␊ |
112 | struct attr *attr;␊ |
113 | u_int16_t offset;␊ |
114 | ␊ |
115 | filerec = (struct filerec *) buf;␊ |
116 | offset = OSReadLittleInt16(&filerec->fr_attroff,0);␊ |
117 | attr = (struct attr *) (buf + offset);␊ |
118 | ␊ |
119 | |
120 | while (attr->a_hdr.a_type != 0xFFFFFFFF)␉/* same for big/little endian */␊ |
121 | {␊ |
122 | if (OSReadLittleInt32(&attr->a_hdr.a_type,0) == attrType)␊ |
123 | {␊ |
124 | if (attr->a_hdr.a_flag != 0)␊ |
125 | {␊ |
126 | //verbose("NTFS: attriubte 0x%X is non-resident\n", attrType);␊ |
127 | return 1;␊ |
128 | }␊ |
129 | ␊ |
130 | *attrSize = OSReadLittleInt16(&attr->a_r.a_datalen,0);␊ |
131 | *attrData = buf + offset + OSReadLittleInt16(&attr->a_r.a_dataoff,0);␊ |
132 | return 0;␉/* found it! */␊ |
133 | }␊ |
134 | ␊ |
135 | /* Skip to the next attribute */␊ |
136 | offset += OSReadLittleInt32(&attr->a_hdr.reclen,0);␊ |
137 | attr = (struct attr *) (buf + offset);␊ |
138 | }␊ |
139 | ␊ |
140 | return 1;␉/* No matching attrType found */␊ |
141 | }␊ |
142 | ␊ |
143 | /*␊ |
144 | * Examine a volume to see if we recognize it as a mountable.␊ |
145 | */␊ |
146 | void␊ |
147 | NTFSGetDescription(CICell ih, char *str, long strMaxLen)␊ |
148 | {␊ |
149 | struct bootfile *boot;␊ |
150 | unsigned bytesPerSector;␊ |
151 | unsigned sectorsPerCluster;␊ |
152 | int mftRecordSize;␊ |
153 | u_int64_t totalClusters;␊ |
154 | u_int64_t cluster, mftCluster;␊ |
155 | size_t mftOffset;␊ |
156 | void *nameAttr;␊ |
157 | size_t nameSize;␊ |
158 | char *buf;␊ |
159 | ␊ |
160 | buf = (char *)malloc(MAX_CLUSTER_SIZE);␊ |
161 | if (buf == 0) {␊ |
162 | goto error;␊ |
163 | }␊ |
164 | ␊ |
165 | /*␊ |
166 | * Read the boot sector, check signatures, and do some minimal␊ |
167 | * sanity checking. NOTE: the size of the read below is intended␊ |
168 | * to be a multiple of all supported block sizes, so we don't␊ |
169 | * have to determine or change the device's block size.␊ |
170 | */␊ |
171 | Seek(ih, 0);␊ |
172 | Read(ih, (long)buf, MAX_BLOCK_SIZE);␊ |
173 | ␊ |
174 | boot = (struct bootfile *) buf;␊ |
175 | ␊ |
176 | /*␊ |
177 | * The first three bytes are an Intel x86 jump instruction. I assume it␊ |
178 | * can be the same forms as DOS FAT:␊ |
179 | * 0xE9 0x?? 0x??␊ |
180 | * 0xEC 0x?? 0x90␊ |
181 | * where 0x?? means any byte value is OK.␊ |
182 | */␊ |
183 | if (boot->reserved1[0] != 0xE9␊ |
184 | && (boot->reserved1[0] != 0xEB || boot->reserved1[2] != 0x90))␊ |
185 | {␊ |
186 | goto error;␊ |
187 | }␊ |
188 | ␊ |
189 | /*␊ |
190 | * Check the "NTFS " signature.␊ |
191 | */␊ |
192 | if (memcmp((const char *)boot->bf_sysid, "NTFS ", 8) != 0)␊ |
193 | {␊ |
194 | goto error;␊ |
195 | }␊ |
196 | ␊ |
197 | /*␊ |
198 | * Make sure the bytes per sector and sectors per cluster are␊ |
199 | * powers of two, and within reasonable ranges.␊ |
200 | */␊ |
201 | bytesPerSector = OSReadLittleInt16(&boot->bf_bps,0);␊ |
202 | if ((bytesPerSector & (bytesPerSector-1)) || bytesPerSector < 512 || bytesPerSector > 32768)␊ |
203 | {␊ |
204 | //verbose("NTFS: invalid bytes per sector (%d)\n", bytesPerSector);␊ |
205 | goto error;␊ |
206 | }␊ |
207 | ␊ |
208 | sectorsPerCluster = boot->bf_spc;␉/* Just one byte; no swapping needed */␊ |
209 | if ((sectorsPerCluster & (sectorsPerCluster-1)) || sectorsPerCluster > 128)␊ |
210 | {␊ |
211 | //verbose("NTFS: invalid sectors per cluster (%d)\n", bytesPerSector);␊ |
212 | goto error;␊ |
213 | }␊ |
214 | ␊ |
215 | /*␊ |
216 | * Calculate the number of clusters from the number of sectors.␊ |
217 | * Then bounds check the $MFT and $MFTMirr clusters.␊ |
218 | */␊ |
219 | totalClusters = OSReadLittleInt64(&boot->bf_spv,0) / sectorsPerCluster;␊ |
220 | mftCluster = OSReadLittleInt64(&boot->bf_mftcn,0);␊ |
221 | if (mftCluster > totalClusters)␊ |
222 | {␊ |
223 | ////verbose("NTFS: invalid $MFT cluster (%lld)\n", mftCluster);␊ |
224 | goto error;␊ |
225 | }␊ |
226 | cluster = OSReadLittleInt64(&boot->bf_mftmirrcn,0);␊ |
227 | if (cluster > totalClusters)␊ |
228 | {␊ |
229 | //verbose("NTFS: invalid $MFTMirr cluster (%lld)\n", cluster);␊ |
230 | goto error;␊ |
231 | }␊ |
232 | ␊ |
233 | /*␊ |
234 | * Determine the size of an MFT record.␊ |
235 | */␊ |
236 | mftRecordSize = (int8_t) boot->bf_mftrecsz;␊ |
237 | if (mftRecordSize < 0)␊ |
238 | mftRecordSize = 1 << -mftRecordSize;␊ |
239 | else␊ |
240 | mftRecordSize *= bytesPerSector * sectorsPerCluster;␊ |
241 | //verbose("NTFS: MFT record size = %d\n", mftRecordSize);␊ |
242 | ␊ |
243 | /*␊ |
244 | * Read the MFT record for $Volume. This assumes the first four␊ |
245 | * file records in the MFT are contiguous; if they aren't, we␊ |
246 | * would have to map the $MFT itself.␊ |
247 | *␊ |
248 | * This will fail if the device sector size is larger than the␊ |
249 | * MFT record size, since the $Volume record won't be aligned␊ |
250 | * on a sector boundary.␊ |
251 | */␊ |
252 | mftOffset = mftCluster * sectorsPerCluster * bytesPerSector;␊ |
253 | mftOffset += mftRecordSize * NTFS_VOLUMEINO;␊ |
254 | ␊ |
255 | Seek(ih, mftOffset);␊ |
256 | Read(ih, (long)buf, mftRecordSize);␊ |
257 | #if UNUSED␊ |
258 | if (lseek(fd, mftOffset, SEEK_SET) == -1)␊ |
259 | {␊ |
260 | //verbose("NTFS: lseek to $Volume failed: %s\n", strerror(errno));␊ |
261 | goto error;␊ |
262 | }␊ |
263 | if (read(fd, buf, mftRecordSize) != mftRecordSize)␊ |
264 | {␊ |
265 | //verbose("NTFS: error reading MFT $Volume record: %s\n",␊ |
266 | strerror(errno));␊ |
267 | goto error;␊ |
268 | }␊ |
269 | #endif␊ |
270 | ␊ |
271 | if (ntfs_fixup(buf, mftRecordSize, NTFS_FILEMAGIC, bytesPerSector) != 0)␊ |
272 | {␊ |
273 | //verbose("NTFS: block fixup failed\n");␊ |
274 | goto error;␊ |
275 | }␊ |
276 | ␊ |
277 | /*␊ |
278 | * Loop over the attributes, looking for $VOLUME_NAME (0x60).␊ |
279 | */␊ |
280 | if(ntfs_find_attr(buf, NTFS_A_VOLUMENAME, &nameAttr, &nameSize) != 0)␊ |
281 | {␊ |
282 | //verbose("NTFS: $VOLUME_NAME attribute not found\n");␊ |
283 | goto error;␊ |
284 | }␊ |
285 | ␊ |
286 | str[0] = '\0';␊ |
287 | ␊ |
288 | utf_encodestr( nameAttr, nameSize / 2, (u_int8_t *)str, strMaxLen, OSLittleEndian );␊ |
289 | ␊ |
290 | free(buf);␊ |
291 | return;␊ |
292 | ␊ |
293 | error:␊ |
294 | if (buf) free(buf);␊ |
295 | return;␊ |
296 | }␊ |
297 | ␊ |
298 | BOOL NTFSProbe(const void * buffer)␊ |
299 | {␊ |
300 | ␉BOOL result = FALSE;␊ |
301 | ␉␊ |
302 | ␉const struct bootfile␉* part_bootfile = buffer;␉␉␉// NTFS boot sector structure␊ |
303 | ␉␊ |
304 | ␉// Looking for NTFS signature.␊ |
305 | ␉if (strncmp((const char *)part_bootfile->bf_sysid, NTFS_BBID, NTFS_BBIDLEN) == 0)␊ |
306 | ␉␉result = TRUE;␊ |
307 | ␉␊ |
308 | ␉return result;␊ |
309 | }␊ |
310 | ␊ |
311 | ␊ |
312 | |