| 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 | |
