Xin Li | 1e1dad6 | 2019-04-10 13:38:23 -0700 | [diff] [blame] | 1 | /*- |
| 2 | * SPDX-License-Identifier: BSD-2-Clause-FreeBSD |
| 3 | * |
Xin Li | 21386e0 | 2020-01-03 09:22:03 -0800 | [diff] [blame] | 4 | * Copyright (c) 2019 Google LLC |
Xin Li | 1e1dad6 | 2019-04-10 13:38:23 -0700 | [diff] [blame] | 5 | * Copyright (C) 1995, 1996, 1997 Wolfgang Solfrank |
| 6 | * Copyright (c) 1995 Martin Husemann |
| 7 | * Some structure declaration borrowed from Paul Popelka |
| 8 | * (paulp@uts.amdahl.com), see /sys/msdosfs/ for reference. |
| 9 | * |
| 10 | * Redistribution and use in source and binary forms, with or without |
| 11 | * modification, are permitted provided that the following conditions |
| 12 | * are met: |
| 13 | * 1. Redistributions of source code must retain the above copyright |
| 14 | * notice, this list of conditions and the following disclaimer. |
| 15 | * 2. Redistributions in binary form must reproduce the above copyright |
| 16 | * notice, this list of conditions and the following disclaimer in the |
| 17 | * documentation and/or other materials provided with the distribution. |
| 18 | * |
| 19 | * THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS OR |
| 20 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
| 21 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
| 22 | * IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY DIRECT, INDIRECT, |
| 23 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
| 24 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| 25 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| 26 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| 27 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
| 28 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 29 | */ |
| 30 | |
| 31 | |
| 32 | #include <sys/cdefs.h> |
| 33 | #ifndef lint |
| 34 | __RCSID("$NetBSD: dir.c,v 1.20 2006/06/05 16:51:18 christos Exp $"); |
| 35 | static const char rcsid[] = |
| 36 | "$FreeBSD$"; |
| 37 | #endif /* not lint */ |
| 38 | |
Xin Li | 760f540 | 2019-04-10 13:39:57 -0700 | [diff] [blame] | 39 | #include <assert.h> |
| 40 | #include <inttypes.h> |
Xin Li | 1e1dad6 | 2019-04-10 13:38:23 -0700 | [diff] [blame] | 41 | #include <stdio.h> |
| 42 | #include <stdlib.h> |
| 43 | #include <string.h> |
| 44 | #include <ctype.h> |
| 45 | #include <unistd.h> |
| 46 | #include <time.h> |
| 47 | |
| 48 | #include <sys/param.h> |
| 49 | |
| 50 | #include "ext.h" |
| 51 | #include "fsutil.h" |
| 52 | |
| 53 | #define SLOT_EMPTY 0x00 /* slot has never been used */ |
| 54 | #define SLOT_E5 0x05 /* the real value is 0xe5 */ |
| 55 | #define SLOT_DELETED 0xe5 /* file in this slot deleted */ |
| 56 | |
| 57 | #define ATTR_NORMAL 0x00 /* normal file */ |
| 58 | #define ATTR_READONLY 0x01 /* file is readonly */ |
| 59 | #define ATTR_HIDDEN 0x02 /* file is hidden */ |
| 60 | #define ATTR_SYSTEM 0x04 /* file is a system file */ |
| 61 | #define ATTR_VOLUME 0x08 /* entry is a volume label */ |
| 62 | #define ATTR_DIRECTORY 0x10 /* entry is a directory name */ |
| 63 | #define ATTR_ARCHIVE 0x20 /* file is new or modified */ |
| 64 | |
| 65 | #define ATTR_WIN95 0x0f /* long name record */ |
| 66 | |
| 67 | /* |
| 68 | * This is the format of the contents of the deTime field in the direntry |
| 69 | * structure. |
| 70 | * We don't use bitfields because we don't know how compilers for |
| 71 | * arbitrary machines will lay them out. |
| 72 | */ |
| 73 | #define DT_2SECONDS_MASK 0x1F /* seconds divided by 2 */ |
| 74 | #define DT_2SECONDS_SHIFT 0 |
| 75 | #define DT_MINUTES_MASK 0x7E0 /* minutes */ |
| 76 | #define DT_MINUTES_SHIFT 5 |
| 77 | #define DT_HOURS_MASK 0xF800 /* hours */ |
| 78 | #define DT_HOURS_SHIFT 11 |
| 79 | |
| 80 | /* |
| 81 | * This is the format of the contents of the deDate field in the direntry |
| 82 | * structure. |
| 83 | */ |
| 84 | #define DD_DAY_MASK 0x1F /* day of month */ |
| 85 | #define DD_DAY_SHIFT 0 |
| 86 | #define DD_MONTH_MASK 0x1E0 /* month */ |
| 87 | #define DD_MONTH_SHIFT 5 |
| 88 | #define DD_YEAR_MASK 0xFE00 /* year - 1980 */ |
| 89 | #define DD_YEAR_SHIFT 9 |
| 90 | |
| 91 | |
| 92 | /* dir.c */ |
| 93 | static struct dosDirEntry *newDosDirEntry(void); |
| 94 | static void freeDosDirEntry(struct dosDirEntry *); |
| 95 | static struct dirTodoNode *newDirTodo(void); |
| 96 | static void freeDirTodo(struct dirTodoNode *); |
| 97 | static char *fullpath(struct dosDirEntry *); |
| 98 | static u_char calcShortSum(u_char *); |
Xin Li | 21386e0 | 2020-01-03 09:22:03 -0800 | [diff] [blame] | 99 | static int delete(struct fat_descriptor *, cl_t, int, cl_t, int, int); |
| 100 | static int removede(struct fat_descriptor *, u_char *, u_char *, |
| 101 | cl_t, cl_t, cl_t, char *, int); |
| 102 | static int checksize(struct fat_descriptor *, u_char *, struct dosDirEntry *); |
| 103 | static int readDosDirSection(struct fat_descriptor *, struct dosDirEntry *); |
Xin Li | 1e1dad6 | 2019-04-10 13:38:23 -0700 | [diff] [blame] | 104 | |
| 105 | /* |
| 106 | * Manage free dosDirEntry structures. |
| 107 | */ |
| 108 | static struct dosDirEntry *freede; |
| 109 | |
| 110 | static struct dosDirEntry * |
| 111 | newDosDirEntry(void) |
| 112 | { |
| 113 | struct dosDirEntry *de; |
| 114 | |
| 115 | if (!(de = freede)) { |
Xin Li | 8b5aba4 | 2019-06-04 08:55:20 -0700 | [diff] [blame] | 116 | if (!(de = malloc(sizeof *de))) |
Xin Li | 21386e0 | 2020-01-03 09:22:03 -0800 | [diff] [blame] | 117 | return (NULL); |
Xin Li | 1e1dad6 | 2019-04-10 13:38:23 -0700 | [diff] [blame] | 118 | } else |
| 119 | freede = de->next; |
| 120 | return de; |
| 121 | } |
| 122 | |
| 123 | static void |
| 124 | freeDosDirEntry(struct dosDirEntry *de) |
| 125 | { |
| 126 | de->next = freede; |
| 127 | freede = de; |
| 128 | } |
| 129 | |
| 130 | /* |
| 131 | * The same for dirTodoNode structures. |
| 132 | */ |
| 133 | static struct dirTodoNode *freedt; |
| 134 | |
| 135 | static struct dirTodoNode * |
| 136 | newDirTodo(void) |
| 137 | { |
| 138 | struct dirTodoNode *dt; |
| 139 | |
| 140 | if (!(dt = freedt)) { |
Xin Li | 8b5aba4 | 2019-06-04 08:55:20 -0700 | [diff] [blame] | 141 | if (!(dt = malloc(sizeof *dt))) |
Xin Li | 1e1dad6 | 2019-04-10 13:38:23 -0700 | [diff] [blame] | 142 | return 0; |
| 143 | } else |
| 144 | freedt = dt->next; |
| 145 | return dt; |
| 146 | } |
| 147 | |
| 148 | static void |
| 149 | freeDirTodo(struct dirTodoNode *dt) |
| 150 | { |
| 151 | dt->next = freedt; |
| 152 | freedt = dt; |
| 153 | } |
| 154 | |
| 155 | /* |
| 156 | * The stack of unread directories |
| 157 | */ |
| 158 | static struct dirTodoNode *pendingDirectories = NULL; |
| 159 | |
| 160 | /* |
| 161 | * Return the full pathname for a directory entry. |
| 162 | */ |
| 163 | static char * |
| 164 | fullpath(struct dosDirEntry *dir) |
| 165 | { |
| 166 | static char namebuf[MAXPATHLEN + 1]; |
| 167 | char *cp, *np; |
| 168 | int nl; |
| 169 | |
Xin Li | a4cbc88 | 2019-10-01 15:09:31 -0700 | [diff] [blame] | 170 | cp = namebuf + sizeof namebuf; |
| 171 | *--cp = '\0'; |
| 172 | |
| 173 | for(;;) { |
Xin Li | 1e1dad6 | 2019-04-10 13:38:23 -0700 | [diff] [blame] | 174 | np = dir->lname[0] ? dir->lname : dir->name; |
| 175 | nl = strlen(np); |
Xin Li | a4cbc88 | 2019-10-01 15:09:31 -0700 | [diff] [blame] | 176 | if (cp <= namebuf + 1 + nl) { |
| 177 | *--cp = '?'; |
Xin Li | 1e1dad6 | 2019-04-10 13:38:23 -0700 | [diff] [blame] | 178 | break; |
Xin Li | a4cbc88 | 2019-10-01 15:09:31 -0700 | [diff] [blame] | 179 | } |
| 180 | cp -= nl; |
Xin Li | 1e1dad6 | 2019-04-10 13:38:23 -0700 | [diff] [blame] | 181 | memcpy(cp, np, nl); |
Xin Li | a4cbc88 | 2019-10-01 15:09:31 -0700 | [diff] [blame] | 182 | dir = dir->parent; |
| 183 | if (!dir) |
| 184 | break; |
Xin Li | 1e1dad6 | 2019-04-10 13:38:23 -0700 | [diff] [blame] | 185 | *--cp = '/'; |
Xin Li | a4cbc88 | 2019-10-01 15:09:31 -0700 | [diff] [blame] | 186 | } |
| 187 | |
Xin Li | 1e1dad6 | 2019-04-10 13:38:23 -0700 | [diff] [blame] | 188 | return cp; |
| 189 | } |
| 190 | |
| 191 | /* |
| 192 | * Calculate a checksum over an 8.3 alias name |
| 193 | */ |
Xin Li | 21386e0 | 2020-01-03 09:22:03 -0800 | [diff] [blame] | 194 | static inline u_char |
Xin Li | 1e1dad6 | 2019-04-10 13:38:23 -0700 | [diff] [blame] | 195 | calcShortSum(u_char *p) |
| 196 | { |
| 197 | u_char sum = 0; |
| 198 | int i; |
| 199 | |
| 200 | for (i = 0; i < 11; i++) { |
| 201 | sum = (sum << 7)|(sum >> 1); /* rotate right */ |
| 202 | sum += p[i]; |
| 203 | } |
| 204 | |
| 205 | return sum; |
| 206 | } |
| 207 | |
| 208 | /* |
| 209 | * Global variables temporarily used during a directory scan |
| 210 | */ |
| 211 | static char longName[DOSLONGNAMELEN] = ""; |
| 212 | static u_char *buffer = NULL; |
| 213 | static u_char *delbuf = NULL; |
| 214 | |
| 215 | static struct dosDirEntry *rootDir; |
| 216 | static struct dosDirEntry *lostDir; |
| 217 | |
| 218 | /* |
| 219 | * Init internal state for a new directory scan. |
| 220 | */ |
| 221 | int |
Xin Li | 21386e0 | 2020-01-03 09:22:03 -0800 | [diff] [blame] | 222 | resetDosDirSection(struct fat_descriptor *fat) |
Xin Li | 1e1dad6 | 2019-04-10 13:38:23 -0700 | [diff] [blame] | 223 | { |
Xin Li | 21386e0 | 2020-01-03 09:22:03 -0800 | [diff] [blame] | 224 | int rootdir_size, cluster_size; |
Xin Li | 1e1dad6 | 2019-04-10 13:38:23 -0700 | [diff] [blame] | 225 | int ret = FSOK; |
| 226 | size_t len; |
Xin Li | 21386e0 | 2020-01-03 09:22:03 -0800 | [diff] [blame] | 227 | struct bootblock *boot; |
Xin Li | 1e1dad6 | 2019-04-10 13:38:23 -0700 | [diff] [blame] | 228 | |
Xin Li | 21386e0 | 2020-01-03 09:22:03 -0800 | [diff] [blame] | 229 | boot = fat_get_boot(fat); |
Xin Li | 1e1dad6 | 2019-04-10 13:38:23 -0700 | [diff] [blame] | 230 | |
Xin Li | 21386e0 | 2020-01-03 09:22:03 -0800 | [diff] [blame] | 231 | rootdir_size = boot->bpbRootDirEnts * 32; |
| 232 | cluster_size = boot->bpbSecPerClust * boot->bpbBytesPerSec; |
| 233 | |
| 234 | if ((buffer = malloc(len = MAX(rootdir_size, cluster_size))) == NULL) { |
Xin Li | 1e1dad6 | 2019-04-10 13:38:23 -0700 | [diff] [blame] | 235 | perr("No space for directory buffer (%zu)", len); |
| 236 | return FSFATAL; |
| 237 | } |
| 238 | |
Xin Li | 21386e0 | 2020-01-03 09:22:03 -0800 | [diff] [blame] | 239 | if ((delbuf = malloc(len = cluster_size)) == NULL) { |
Xin Li | 1e1dad6 | 2019-04-10 13:38:23 -0700 | [diff] [blame] | 240 | free(buffer); |
| 241 | perr("No space for directory delbuf (%zu)", len); |
| 242 | return FSFATAL; |
| 243 | } |
| 244 | |
| 245 | if ((rootDir = newDosDirEntry()) == NULL) { |
| 246 | free(buffer); |
| 247 | free(delbuf); |
| 248 | perr("No space for directory entry"); |
| 249 | return FSFATAL; |
| 250 | } |
| 251 | |
| 252 | memset(rootDir, 0, sizeof *rootDir); |
| 253 | if (boot->flags & FAT32) { |
Xin Li | 21386e0 | 2020-01-03 09:22:03 -0800 | [diff] [blame] | 254 | if (!fat_is_cl_head(fat, boot->bpbRootClust)) { |
Xin Li | a4cbc88 | 2019-10-01 15:09:31 -0700 | [diff] [blame] | 255 | pfatal("Root directory doesn't start a cluster chain"); |
| 256 | return FSFATAL; |
Xin Li | 1e1dad6 | 2019-04-10 13:38:23 -0700 | [diff] [blame] | 257 | } |
Xin Li | 1e1dad6 | 2019-04-10 13:38:23 -0700 | [diff] [blame] | 258 | rootDir->head = boot->bpbRootClust; |
| 259 | } |
| 260 | |
| 261 | return ret; |
| 262 | } |
| 263 | |
| 264 | /* |
| 265 | * Cleanup after a directory scan |
| 266 | */ |
| 267 | void |
| 268 | finishDosDirSection(void) |
| 269 | { |
| 270 | struct dirTodoNode *p, *np; |
| 271 | struct dosDirEntry *d, *nd; |
| 272 | |
| 273 | for (p = pendingDirectories; p; p = np) { |
| 274 | np = p->next; |
| 275 | freeDirTodo(p); |
| 276 | } |
| 277 | pendingDirectories = NULL; |
| 278 | for (d = rootDir; d; d = nd) { |
| 279 | if ((nd = d->child) != NULL) { |
| 280 | d->child = 0; |
| 281 | continue; |
| 282 | } |
| 283 | if (!(nd = d->next)) |
| 284 | nd = d->parent; |
| 285 | freeDosDirEntry(d); |
| 286 | } |
| 287 | rootDir = lostDir = NULL; |
| 288 | free(buffer); |
| 289 | free(delbuf); |
| 290 | buffer = NULL; |
| 291 | delbuf = NULL; |
| 292 | } |
| 293 | |
| 294 | /* |
| 295 | * Delete directory entries between startcl, startoff and endcl, endoff. |
| 296 | */ |
| 297 | static int |
Xin Li | 21386e0 | 2020-01-03 09:22:03 -0800 | [diff] [blame] | 298 | delete(struct fat_descriptor *fat, cl_t startcl, |
Xin Li | 1e1dad6 | 2019-04-10 13:38:23 -0700 | [diff] [blame] | 299 | int startoff, cl_t endcl, int endoff, int notlast) |
| 300 | { |
| 301 | u_char *s, *e; |
| 302 | off_t off; |
Xin Li | 21386e0 | 2020-01-03 09:22:03 -0800 | [diff] [blame] | 303 | int clsz, fd; |
| 304 | struct bootblock *boot; |
| 305 | |
| 306 | boot = fat_get_boot(fat); |
| 307 | fd = fat_get_fd(fat); |
| 308 | clsz = boot->bpbSecPerClust * boot->bpbBytesPerSec; |
Xin Li | 1e1dad6 | 2019-04-10 13:38:23 -0700 | [diff] [blame] | 309 | |
| 310 | s = delbuf + startoff; |
| 311 | e = delbuf + clsz; |
Xin Li | 21386e0 | 2020-01-03 09:22:03 -0800 | [diff] [blame] | 312 | while (fat_is_valid_cl(fat, startcl)) { |
Xin Li | 1e1dad6 | 2019-04-10 13:38:23 -0700 | [diff] [blame] | 313 | if (startcl == endcl) { |
| 314 | if (notlast) |
| 315 | break; |
| 316 | e = delbuf + endoff; |
| 317 | } |
Xin Li | a4cbc88 | 2019-10-01 15:09:31 -0700 | [diff] [blame] | 318 | off = (startcl - CLUST_FIRST) * boot->bpbSecPerClust + boot->FirstCluster; |
| 319 | |
Xin Li | 1e1dad6 | 2019-04-10 13:38:23 -0700 | [diff] [blame] | 320 | off *= boot->bpbBytesPerSec; |
Xin Li | 21386e0 | 2020-01-03 09:22:03 -0800 | [diff] [blame] | 321 | if (lseek(fd, off, SEEK_SET) != off) { |
Xin Li | 760f540 | 2019-04-10 13:39:57 -0700 | [diff] [blame] | 322 | perr("Unable to lseek to %" PRId64, off); |
| 323 | return FSFATAL; |
| 324 | } |
Xin Li | 21386e0 | 2020-01-03 09:22:03 -0800 | [diff] [blame] | 325 | if (read(fd, delbuf, clsz) != clsz) { |
Xin Li | 1e1dad6 | 2019-04-10 13:38:23 -0700 | [diff] [blame] | 326 | perr("Unable to read directory"); |
| 327 | return FSFATAL; |
| 328 | } |
| 329 | while (s < e) { |
| 330 | *s = SLOT_DELETED; |
| 331 | s += 32; |
| 332 | } |
Xin Li | 21386e0 | 2020-01-03 09:22:03 -0800 | [diff] [blame] | 333 | if (lseek(fd, off, SEEK_SET) != off) { |
Xin Li | 760f540 | 2019-04-10 13:39:57 -0700 | [diff] [blame] | 334 | perr("Unable to lseek to %" PRId64, off); |
| 335 | return FSFATAL; |
| 336 | } |
Xin Li | 21386e0 | 2020-01-03 09:22:03 -0800 | [diff] [blame] | 337 | if (write(fd, delbuf, clsz) != clsz) { |
Xin Li | 1e1dad6 | 2019-04-10 13:38:23 -0700 | [diff] [blame] | 338 | perr("Unable to write directory"); |
| 339 | return FSFATAL; |
| 340 | } |
| 341 | if (startcl == endcl) |
| 342 | break; |
Xin Li | 21386e0 | 2020-01-03 09:22:03 -0800 | [diff] [blame] | 343 | startcl = fat_get_cl_next(fat, startcl); |
Xin Li | 1e1dad6 | 2019-04-10 13:38:23 -0700 | [diff] [blame] | 344 | s = delbuf; |
| 345 | } |
| 346 | return FSOK; |
| 347 | } |
| 348 | |
| 349 | static int |
Xin Li | 21386e0 | 2020-01-03 09:22:03 -0800 | [diff] [blame] | 350 | removede(struct fat_descriptor *fat, u_char *start, |
| 351 | u_char *end, cl_t startcl, cl_t endcl, cl_t curcl, |
| 352 | char *path, int type) |
Xin Li | 1e1dad6 | 2019-04-10 13:38:23 -0700 | [diff] [blame] | 353 | { |
| 354 | switch (type) { |
| 355 | case 0: |
| 356 | pwarn("Invalid long filename entry for %s\n", path); |
| 357 | break; |
| 358 | case 1: |
| 359 | pwarn("Invalid long filename entry at end of directory %s\n", |
| 360 | path); |
| 361 | break; |
| 362 | case 2: |
| 363 | pwarn("Invalid long filename entry for volume label\n"); |
| 364 | break; |
| 365 | } |
| 366 | if (ask(0, "Remove")) { |
| 367 | if (startcl != curcl) { |
Xin Li | 21386e0 | 2020-01-03 09:22:03 -0800 | [diff] [blame] | 368 | if (delete(fat, |
Xin Li | 1e1dad6 | 2019-04-10 13:38:23 -0700 | [diff] [blame] | 369 | startcl, start - buffer, |
| 370 | endcl, end - buffer, |
| 371 | endcl == curcl) == FSFATAL) |
| 372 | return FSFATAL; |
| 373 | start = buffer; |
| 374 | } |
Xin Li | 21386e0 | 2020-01-03 09:22:03 -0800 | [diff] [blame] | 375 | /* startcl is < CLUST_FIRST for !FAT32 root */ |
Xin Li | 1e1dad6 | 2019-04-10 13:38:23 -0700 | [diff] [blame] | 376 | if ((endcl == curcl) || (startcl < CLUST_FIRST)) |
| 377 | for (; start < end; start += 32) |
| 378 | *start = SLOT_DELETED; |
| 379 | return FSDIRMOD; |
| 380 | } |
| 381 | return FSERROR; |
| 382 | } |
| 383 | |
| 384 | /* |
| 385 | * Check an in-memory file entry |
| 386 | */ |
| 387 | static int |
Xin Li | 21386e0 | 2020-01-03 09:22:03 -0800 | [diff] [blame] | 388 | checksize(struct fat_descriptor *fat, u_char *p, struct dosDirEntry *dir) |
Xin Li | 1e1dad6 | 2019-04-10 13:38:23 -0700 | [diff] [blame] | 389 | { |
Xin Li | 21386e0 | 2020-01-03 09:22:03 -0800 | [diff] [blame] | 390 | int ret = FSOK; |
| 391 | size_t physicalSize; |
| 392 | struct bootblock *boot; |
| 393 | |
| 394 | boot = fat_get_boot(fat); |
| 395 | |
Xin Li | 1e1dad6 | 2019-04-10 13:38:23 -0700 | [diff] [blame] | 396 | /* |
| 397 | * Check size on ordinary files |
| 398 | */ |
Xin Li | 21386e0 | 2020-01-03 09:22:03 -0800 | [diff] [blame] | 399 | if (dir->head == CLUST_FREE) { |
Xin Li | 1e1dad6 | 2019-04-10 13:38:23 -0700 | [diff] [blame] | 400 | physicalSize = 0; |
Xin Li | 21386e0 | 2020-01-03 09:22:03 -0800 | [diff] [blame] | 401 | } else { |
| 402 | if (!fat_is_valid_cl(fat, dir->head)) |
Xin Li | 1e1dad6 | 2019-04-10 13:38:23 -0700 | [diff] [blame] | 403 | return FSERROR; |
Xin Li | 21386e0 | 2020-01-03 09:22:03 -0800 | [diff] [blame] | 404 | ret = checkchain(fat, dir->head, &physicalSize); |
| 405 | /* |
| 406 | * Upon return, physicalSize would hold the chain length |
| 407 | * that checkchain() was able to validate, but if the user |
| 408 | * refused the proposed repair, it would be unsafe to |
| 409 | * proceed with directory entry fix, so bail out in that |
| 410 | * case. |
| 411 | */ |
| 412 | if (ret == FSERROR) { |
| 413 | return (FSERROR); |
| 414 | } |
| 415 | physicalSize *= boot->ClusterSize; |
Xin Li | 1e1dad6 | 2019-04-10 13:38:23 -0700 | [diff] [blame] | 416 | } |
| 417 | if (physicalSize < dir->size) { |
Xin Li | 21386e0 | 2020-01-03 09:22:03 -0800 | [diff] [blame] | 418 | pwarn("size of %s is %u, should at most be %zu\n", |
Xin Li | 1e1dad6 | 2019-04-10 13:38:23 -0700 | [diff] [blame] | 419 | fullpath(dir), dir->size, physicalSize); |
| 420 | if (ask(1, "Truncate")) { |
| 421 | dir->size = physicalSize; |
| 422 | p[28] = (u_char)physicalSize; |
| 423 | p[29] = (u_char)(physicalSize >> 8); |
| 424 | p[30] = (u_char)(physicalSize >> 16); |
| 425 | p[31] = (u_char)(physicalSize >> 24); |
| 426 | return FSDIRMOD; |
| 427 | } else |
| 428 | return FSERROR; |
| 429 | } else if (physicalSize - dir->size >= boot->ClusterSize) { |
| 430 | pwarn("%s has too many clusters allocated\n", |
| 431 | fullpath(dir)); |
| 432 | if (ask(1, "Drop superfluous clusters")) { |
| 433 | cl_t cl; |
| 434 | u_int32_t sz, len; |
| 435 | |
| 436 | for (cl = dir->head, len = sz = 0; |
| 437 | (sz += boot->ClusterSize) < dir->size; len++) |
Xin Li | 21386e0 | 2020-01-03 09:22:03 -0800 | [diff] [blame] | 438 | cl = fat_get_cl_next(fat, cl); |
| 439 | clearchain(fat, fat_get_cl_next(fat, cl)); |
| 440 | ret = fat_set_cl_next(fat, cl, CLUST_EOF); |
| 441 | return (FSFATMOD | ret); |
Xin Li | 1e1dad6 | 2019-04-10 13:38:23 -0700 | [diff] [blame] | 442 | } else |
| 443 | return FSERROR; |
| 444 | } |
| 445 | return FSOK; |
| 446 | } |
| 447 | |
Xin Li | 760f540 | 2019-04-10 13:39:57 -0700 | [diff] [blame] | 448 | static const u_char dot_name[11] = ". "; |
| 449 | static const u_char dotdot_name[11] = ".. "; |
| 450 | |
| 451 | /* |
| 452 | * Basic sanity check if the subdirectory have good '.' and '..' entries, |
| 453 | * and they are directory entries. Further sanity checks are performed |
| 454 | * when we traverse into it. |
| 455 | */ |
| 456 | static int |
Xin Li | 21386e0 | 2020-01-03 09:22:03 -0800 | [diff] [blame] | 457 | check_subdirectory(struct fat_descriptor *fat, struct dosDirEntry *dir) |
Xin Li | 760f540 | 2019-04-10 13:39:57 -0700 | [diff] [blame] | 458 | { |
| 459 | u_char *buf, *cp; |
| 460 | off_t off; |
| 461 | cl_t cl; |
| 462 | int retval = FSOK; |
Xin Li | 21386e0 | 2020-01-03 09:22:03 -0800 | [diff] [blame] | 463 | int fd; |
| 464 | struct bootblock *boot; |
| 465 | |
| 466 | boot = fat_get_boot(fat); |
| 467 | fd = fat_get_fd(fat); |
Xin Li | 760f540 | 2019-04-10 13:39:57 -0700 | [diff] [blame] | 468 | |
| 469 | cl = dir->head; |
Xin Li | 21386e0 | 2020-01-03 09:22:03 -0800 | [diff] [blame] | 470 | if (dir->parent && !fat_is_valid_cl(fat, cl)) { |
Xin Li | 760f540 | 2019-04-10 13:39:57 -0700 | [diff] [blame] | 471 | return FSERROR; |
| 472 | } |
| 473 | |
| 474 | if (!(boot->flags & FAT32) && !dir->parent) { |
| 475 | off = boot->bpbResSectors + boot->bpbFATs * |
| 476 | boot->FATsecs; |
| 477 | } else { |
Xin Li | a4cbc88 | 2019-10-01 15:09:31 -0700 | [diff] [blame] | 478 | off = (cl - CLUST_FIRST) * boot->bpbSecPerClust + boot->FirstCluster; |
Xin Li | 760f540 | 2019-04-10 13:39:57 -0700 | [diff] [blame] | 479 | } |
| 480 | |
| 481 | /* |
| 482 | * We only need to check the first two entries of the directory, |
| 483 | * which is found in the first sector of the directory entry, |
| 484 | * so read in only the first sector. |
| 485 | */ |
| 486 | buf = malloc(boot->bpbBytesPerSec); |
| 487 | if (buf == NULL) { |
| 488 | perr("No space for directory buffer (%u)", |
| 489 | boot->bpbBytesPerSec); |
| 490 | return FSFATAL; |
| 491 | } |
| 492 | |
| 493 | off *= boot->bpbBytesPerSec; |
Xin Li | 21386e0 | 2020-01-03 09:22:03 -0800 | [diff] [blame] | 494 | if (lseek(fd, off, SEEK_SET) != off || |
| 495 | read(fd, buf, boot->bpbBytesPerSec) != (ssize_t)boot->bpbBytesPerSec) { |
Xin Li | 760f540 | 2019-04-10 13:39:57 -0700 | [diff] [blame] | 496 | perr("Unable to read directory"); |
| 497 | free(buf); |
| 498 | return FSFATAL; |
| 499 | } |
| 500 | |
| 501 | /* |
| 502 | * Both `.' and `..' must be present and be the first two entries |
| 503 | * and be ATTR_DIRECTORY of a valid subdirectory. |
| 504 | */ |
| 505 | cp = buf; |
| 506 | if (memcmp(cp, dot_name, sizeof(dot_name)) != 0 || |
| 507 | (cp[11] & ATTR_DIRECTORY) != ATTR_DIRECTORY) { |
| 508 | pwarn("%s: Incorrect `.' for %s.\n", __func__, dir->name); |
| 509 | retval |= FSERROR; |
| 510 | } |
| 511 | cp += 32; |
| 512 | if (memcmp(cp, dotdot_name, sizeof(dotdot_name)) != 0 || |
| 513 | (cp[11] & ATTR_DIRECTORY) != ATTR_DIRECTORY) { |
| 514 | pwarn("%s: Incorrect `..' for %s. \n", __func__, dir->name); |
| 515 | retval |= FSERROR; |
| 516 | } |
| 517 | |
| 518 | free(buf); |
| 519 | return retval; |
| 520 | } |
| 521 | |
Xin Li | 1e1dad6 | 2019-04-10 13:38:23 -0700 | [diff] [blame] | 522 | /* |
| 523 | * Read a directory and |
| 524 | * - resolve long name records |
| 525 | * - enter file and directory records into the parent's list |
| 526 | * - push directories onto the todo-stack |
| 527 | */ |
| 528 | static int |
Xin Li | 21386e0 | 2020-01-03 09:22:03 -0800 | [diff] [blame] | 529 | readDosDirSection(struct fat_descriptor *fat, struct dosDirEntry *dir) |
Xin Li | 1e1dad6 | 2019-04-10 13:38:23 -0700 | [diff] [blame] | 530 | { |
Xin Li | 21386e0 | 2020-01-03 09:22:03 -0800 | [diff] [blame] | 531 | struct bootblock *boot; |
Xin Li | 1e1dad6 | 2019-04-10 13:38:23 -0700 | [diff] [blame] | 532 | struct dosDirEntry dirent, *d; |
| 533 | u_char *p, *vallfn, *invlfn, *empty; |
| 534 | off_t off; |
Xin Li | 21386e0 | 2020-01-03 09:22:03 -0800 | [diff] [blame] | 535 | int fd, i, j, k, iosize, entries; |
| 536 | bool is_legacyroot; |
Xin Li | 1e1dad6 | 2019-04-10 13:38:23 -0700 | [diff] [blame] | 537 | cl_t cl, valcl = ~0, invcl = ~0, empcl = ~0; |
| 538 | char *t; |
| 539 | u_int lidx = 0; |
| 540 | int shortSum; |
| 541 | int mod = FSOK; |
Xin Li | 21386e0 | 2020-01-03 09:22:03 -0800 | [diff] [blame] | 542 | size_t dirclusters; |
Xin Li | 1e1dad6 | 2019-04-10 13:38:23 -0700 | [diff] [blame] | 543 | #define THISMOD 0x8000 /* Only used within this routine */ |
| 544 | |
Xin Li | 21386e0 | 2020-01-03 09:22:03 -0800 | [diff] [blame] | 545 | boot = fat_get_boot(fat); |
| 546 | fd = fat_get_fd(fat); |
| 547 | |
Xin Li | 1e1dad6 | 2019-04-10 13:38:23 -0700 | [diff] [blame] | 548 | cl = dir->head; |
Xin Li | 21386e0 | 2020-01-03 09:22:03 -0800 | [diff] [blame] | 549 | if (dir->parent && (!fat_is_valid_cl(fat, cl))) { |
Xin Li | 1e1dad6 | 2019-04-10 13:38:23 -0700 | [diff] [blame] | 550 | /* |
| 551 | * Already handled somewhere else. |
| 552 | */ |
| 553 | return FSOK; |
| 554 | } |
| 555 | shortSum = -1; |
| 556 | vallfn = invlfn = empty = NULL; |
Xin Li | 21386e0 | 2020-01-03 09:22:03 -0800 | [diff] [blame] | 557 | |
| 558 | /* |
| 559 | * If we are checking the legacy root (for FAT12/FAT16), |
| 560 | * we will operate on the whole directory; otherwise, we |
| 561 | * will operate on one cluster at a time, and also take |
| 562 | * this opportunity to examine the chain. |
| 563 | * |
| 564 | * Derive how many entries we are going to encounter from |
| 565 | * the I/O size. |
| 566 | */ |
| 567 | is_legacyroot = (dir->parent == NULL && !(boot->flags & FAT32)); |
| 568 | if (is_legacyroot) { |
| 569 | iosize = boot->bpbRootDirEnts * 32; |
| 570 | entries = boot->bpbRootDirEnts; |
| 571 | } else { |
| 572 | iosize = boot->bpbSecPerClust * boot->bpbBytesPerSec; |
| 573 | entries = iosize / 32; |
| 574 | mod |= checkchain(fat, dir->head, &dirclusters); |
| 575 | } |
| 576 | |
Xin Li | 1e1dad6 | 2019-04-10 13:38:23 -0700 | [diff] [blame] | 577 | do { |
Xin Li | 21386e0 | 2020-01-03 09:22:03 -0800 | [diff] [blame] | 578 | if (is_legacyroot) { |
| 579 | /* |
| 580 | * Special case for FAT12/FAT16 root -- read |
| 581 | * in the whole root directory. |
| 582 | */ |
Xin Li | 1e1dad6 | 2019-04-10 13:38:23 -0700 | [diff] [blame] | 583 | off = boot->bpbResSectors + boot->bpbFATs * |
| 584 | boot->FATsecs; |
| 585 | } else { |
Xin Li | 21386e0 | 2020-01-03 09:22:03 -0800 | [diff] [blame] | 586 | /* |
| 587 | * Otherwise, read in a cluster of the |
| 588 | * directory. |
| 589 | */ |
Xin Li | a4cbc88 | 2019-10-01 15:09:31 -0700 | [diff] [blame] | 590 | off = (cl - CLUST_FIRST) * boot->bpbSecPerClust + boot->FirstCluster; |
Xin Li | 1e1dad6 | 2019-04-10 13:38:23 -0700 | [diff] [blame] | 591 | } |
| 592 | |
| 593 | off *= boot->bpbBytesPerSec; |
Xin Li | 21386e0 | 2020-01-03 09:22:03 -0800 | [diff] [blame] | 594 | if (lseek(fd, off, SEEK_SET) != off || |
| 595 | read(fd, buffer, iosize) != iosize) { |
Xin Li | 1e1dad6 | 2019-04-10 13:38:23 -0700 | [diff] [blame] | 596 | perr("Unable to read directory"); |
| 597 | return FSFATAL; |
| 598 | } |
Xin Li | 21386e0 | 2020-01-03 09:22:03 -0800 | [diff] [blame] | 599 | |
| 600 | for (p = buffer, i = 0; i < entries; i++, p += 32) { |
Xin Li | 1e1dad6 | 2019-04-10 13:38:23 -0700 | [diff] [blame] | 601 | if (dir->fsckflags & DIREMPWARN) { |
| 602 | *p = SLOT_EMPTY; |
| 603 | continue; |
| 604 | } |
| 605 | |
| 606 | if (*p == SLOT_EMPTY || *p == SLOT_DELETED) { |
| 607 | if (*p == SLOT_EMPTY) { |
| 608 | dir->fsckflags |= DIREMPTY; |
| 609 | empty = p; |
| 610 | empcl = cl; |
| 611 | } |
| 612 | continue; |
| 613 | } |
| 614 | |
| 615 | if (dir->fsckflags & DIREMPTY) { |
| 616 | if (!(dir->fsckflags & DIREMPWARN)) { |
| 617 | pwarn("%s has entries after end of directory\n", |
| 618 | fullpath(dir)); |
| 619 | if (ask(1, "Extend")) { |
| 620 | u_char *q; |
| 621 | |
| 622 | dir->fsckflags &= ~DIREMPTY; |
Xin Li | 21386e0 | 2020-01-03 09:22:03 -0800 | [diff] [blame] | 623 | if (delete(fat, |
Xin Li | 1e1dad6 | 2019-04-10 13:38:23 -0700 | [diff] [blame] | 624 | empcl, empty - buffer, |
| 625 | cl, p - buffer, 1) == FSFATAL) |
| 626 | return FSFATAL; |
Xin Li | 760f540 | 2019-04-10 13:39:57 -0700 | [diff] [blame] | 627 | q = ((empcl == cl) ? empty : buffer); |
| 628 | assert(q != NULL); |
Xin Li | 1e1dad6 | 2019-04-10 13:38:23 -0700 | [diff] [blame] | 629 | for (; q < p; q += 32) |
| 630 | *q = SLOT_DELETED; |
| 631 | mod |= THISMOD|FSDIRMOD; |
| 632 | } else if (ask(0, "Truncate")) |
| 633 | dir->fsckflags |= DIREMPWARN; |
| 634 | } |
| 635 | if (dir->fsckflags & DIREMPWARN) { |
| 636 | *p = SLOT_DELETED; |
| 637 | mod |= THISMOD|FSDIRMOD; |
| 638 | continue; |
| 639 | } else if (dir->fsckflags & DIREMPTY) |
| 640 | mod |= FSERROR; |
| 641 | empty = NULL; |
| 642 | } |
| 643 | |
| 644 | if (p[11] == ATTR_WIN95) { |
| 645 | if (*p & LRFIRST) { |
| 646 | if (shortSum != -1) { |
| 647 | if (!invlfn) { |
| 648 | invlfn = vallfn; |
| 649 | invcl = valcl; |
| 650 | } |
| 651 | } |
| 652 | memset(longName, 0, sizeof longName); |
| 653 | shortSum = p[13]; |
| 654 | vallfn = p; |
| 655 | valcl = cl; |
| 656 | } else if (shortSum != p[13] |
| 657 | || lidx != (*p & LRNOMASK)) { |
| 658 | if (!invlfn) { |
| 659 | invlfn = vallfn; |
| 660 | invcl = valcl; |
| 661 | } |
| 662 | if (!invlfn) { |
| 663 | invlfn = p; |
| 664 | invcl = cl; |
| 665 | } |
| 666 | vallfn = NULL; |
| 667 | } |
| 668 | lidx = *p & LRNOMASK; |
Xin Li | 47045d8 | 2019-06-12 10:02:31 -0700 | [diff] [blame] | 669 | if (lidx == 0) { |
| 670 | pwarn("invalid long name\n"); |
| 671 | if (!invlfn) { |
| 672 | invlfn = vallfn; |
| 673 | invcl = valcl; |
| 674 | } |
| 675 | vallfn = NULL; |
| 676 | continue; |
| 677 | } |
Xin Li | 1e1dad6 | 2019-04-10 13:38:23 -0700 | [diff] [blame] | 678 | t = longName + --lidx * 13; |
| 679 | for (k = 1; k < 11 && t < longName + |
| 680 | sizeof(longName); k += 2) { |
| 681 | if (!p[k] && !p[k + 1]) |
| 682 | break; |
| 683 | *t++ = p[k]; |
| 684 | /* |
| 685 | * Warn about those unusable chars in msdosfs here? XXX |
| 686 | */ |
| 687 | if (p[k + 1]) |
| 688 | t[-1] = '?'; |
| 689 | } |
| 690 | if (k >= 11) |
| 691 | for (k = 14; k < 26 && t < longName + sizeof(longName); k += 2) { |
| 692 | if (!p[k] && !p[k + 1]) |
| 693 | break; |
| 694 | *t++ = p[k]; |
| 695 | if (p[k + 1]) |
| 696 | t[-1] = '?'; |
| 697 | } |
| 698 | if (k >= 26) |
| 699 | for (k = 28; k < 32 && t < longName + sizeof(longName); k += 2) { |
| 700 | if (!p[k] && !p[k + 1]) |
| 701 | break; |
| 702 | *t++ = p[k]; |
| 703 | if (p[k + 1]) |
| 704 | t[-1] = '?'; |
| 705 | } |
| 706 | if (t >= longName + sizeof(longName)) { |
| 707 | pwarn("long filename too long\n"); |
| 708 | if (!invlfn) { |
| 709 | invlfn = vallfn; |
| 710 | invcl = valcl; |
| 711 | } |
| 712 | vallfn = NULL; |
| 713 | } |
| 714 | if (p[26] | (p[27] << 8)) { |
| 715 | pwarn("long filename record cluster start != 0\n"); |
| 716 | if (!invlfn) { |
| 717 | invlfn = vallfn; |
| 718 | invcl = cl; |
| 719 | } |
| 720 | vallfn = NULL; |
| 721 | } |
| 722 | continue; /* long records don't carry further |
| 723 | * information */ |
| 724 | } |
| 725 | |
| 726 | /* |
| 727 | * This is a standard msdosfs directory entry. |
| 728 | */ |
| 729 | memset(&dirent, 0, sizeof dirent); |
| 730 | |
| 731 | /* |
| 732 | * it's a short name record, but we need to know |
| 733 | * more, so get the flags first. |
| 734 | */ |
| 735 | dirent.flags = p[11]; |
| 736 | |
| 737 | /* |
| 738 | * Translate from 850 to ISO here XXX |
| 739 | */ |
| 740 | for (j = 0; j < 8; j++) |
| 741 | dirent.name[j] = p[j]; |
| 742 | dirent.name[8] = '\0'; |
| 743 | for (k = 7; k >= 0 && dirent.name[k] == ' '; k--) |
| 744 | dirent.name[k] = '\0'; |
| 745 | if (k < 0 || dirent.name[k] != '\0') |
| 746 | k++; |
| 747 | if (dirent.name[0] == SLOT_E5) |
| 748 | dirent.name[0] = 0xe5; |
| 749 | |
| 750 | if (dirent.flags & ATTR_VOLUME) { |
| 751 | if (vallfn || invlfn) { |
Xin Li | 21386e0 | 2020-01-03 09:22:03 -0800 | [diff] [blame] | 752 | mod |= removede(fat, |
Xin Li | 1e1dad6 | 2019-04-10 13:38:23 -0700 | [diff] [blame] | 753 | invlfn ? invlfn : vallfn, p, |
| 754 | invlfn ? invcl : valcl, -1, 0, |
| 755 | fullpath(dir), 2); |
| 756 | vallfn = NULL; |
| 757 | invlfn = NULL; |
| 758 | } |
| 759 | continue; |
| 760 | } |
| 761 | |
| 762 | if (p[8] != ' ') |
| 763 | dirent.name[k++] = '.'; |
| 764 | for (j = 0; j < 3; j++) |
| 765 | dirent.name[k++] = p[j+8]; |
| 766 | dirent.name[k] = '\0'; |
| 767 | for (k--; k >= 0 && dirent.name[k] == ' '; k--) |
| 768 | dirent.name[k] = '\0'; |
| 769 | |
| 770 | if (vallfn && shortSum != calcShortSum(p)) { |
| 771 | if (!invlfn) { |
| 772 | invlfn = vallfn; |
| 773 | invcl = valcl; |
| 774 | } |
| 775 | vallfn = NULL; |
| 776 | } |
| 777 | dirent.head = p[26] | (p[27] << 8); |
| 778 | if (boot->ClustMask == CLUST32_MASK) |
| 779 | dirent.head |= (p[20] << 16) | (p[21] << 24); |
| 780 | dirent.size = p[28] | (p[29] << 8) | (p[30] << 16) | (p[31] << 24); |
| 781 | if (vallfn) { |
| 782 | strlcpy(dirent.lname, longName, |
| 783 | sizeof(dirent.lname)); |
| 784 | longName[0] = '\0'; |
| 785 | shortSum = -1; |
| 786 | } |
| 787 | |
| 788 | dirent.parent = dir; |
| 789 | dirent.next = dir->child; |
| 790 | |
| 791 | if (invlfn) { |
Xin Li | 21386e0 | 2020-01-03 09:22:03 -0800 | [diff] [blame] | 792 | mod |= k = removede(fat, |
Xin Li | 1e1dad6 | 2019-04-10 13:38:23 -0700 | [diff] [blame] | 793 | invlfn, vallfn ? vallfn : p, |
| 794 | invcl, vallfn ? valcl : cl, cl, |
| 795 | fullpath(&dirent), 0); |
| 796 | if (mod & FSFATAL) |
| 797 | return FSFATAL; |
| 798 | if (vallfn |
| 799 | ? (valcl == cl && vallfn != buffer) |
| 800 | : p != buffer) |
| 801 | if (k & FSDIRMOD) |
| 802 | mod |= THISMOD; |
| 803 | } |
| 804 | |
| 805 | vallfn = NULL; /* not used any longer */ |
| 806 | invlfn = NULL; |
| 807 | |
Xin Li | 21386e0 | 2020-01-03 09:22:03 -0800 | [diff] [blame] | 808 | /* |
| 809 | * Check if the directory entry is sane. |
| 810 | * |
| 811 | * '.' and '..' are skipped, their sanity is |
| 812 | * checked somewhere else. |
| 813 | * |
| 814 | * For everything else, check if we have a new, |
| 815 | * valid cluster chain (beginning of a file or |
| 816 | * directory that was never previously claimed |
| 817 | * by another file) when it's a non-empty file |
| 818 | * or a directory. The sanity of the cluster |
| 819 | * chain is checked at a later time when we |
| 820 | * traverse into the directory, or examine the |
| 821 | * file's directory entry. |
| 822 | * |
| 823 | * The only possible fix is to delete the entry |
| 824 | * if it's a directory; for file, we have to |
| 825 | * truncate the size to 0. |
| 826 | */ |
| 827 | if (!(dirent.flags & ATTR_DIRECTORY) || |
| 828 | (strcmp(dirent.name, ".") != 0 && |
| 829 | strcmp(dirent.name, "..") != 0)) { |
| 830 | if ((dirent.size != 0 || (dirent.flags & ATTR_DIRECTORY)) && |
| 831 | ((!fat_is_valid_cl(fat, dirent.head) || |
| 832 | !fat_is_cl_head(fat, dirent.head)))) { |
| 833 | if (!fat_is_valid_cl(fat, dirent.head)) { |
| 834 | pwarn("%s starts with cluster out of range(%u)\n", |
| 835 | fullpath(&dirent), |
| 836 | dirent.head); |
| 837 | } else { |
| 838 | pwarn("%s doesn't start a new cluster chain\n", |
| 839 | fullpath(&dirent)); |
| 840 | } |
| 841 | |
| 842 | if (dirent.flags & ATTR_DIRECTORY) { |
| 843 | if (ask(0, "Remove")) { |
| 844 | *p = SLOT_DELETED; |
| 845 | mod |= THISMOD|FSDIRMOD; |
| 846 | } else |
| 847 | mod |= FSERROR; |
| 848 | continue; |
| 849 | } else { |
| 850 | if (ask(1, "Truncate")) { |
| 851 | p[28] = p[29] = p[30] = p[31] = 0; |
| 852 | p[26] = p[27] = 0; |
| 853 | if (boot->ClustMask == CLUST32_MASK) |
| 854 | p[20] = p[21] = 0; |
| 855 | dirent.size = 0; |
| 856 | dirent.head = 0; |
| 857 | mod |= THISMOD|FSDIRMOD; |
| 858 | } else |
| 859 | mod |= FSERROR; |
| 860 | } |
Xin Li | 1e1dad6 | 2019-04-10 13:38:23 -0700 | [diff] [blame] | 861 | } |
| 862 | } |
Xin Li | 1e1dad6 | 2019-04-10 13:38:23 -0700 | [diff] [blame] | 863 | if (dirent.flags & ATTR_DIRECTORY) { |
| 864 | /* |
| 865 | * gather more info for directories |
| 866 | */ |
| 867 | struct dirTodoNode *n; |
| 868 | |
| 869 | if (dirent.size) { |
| 870 | pwarn("Directory %s has size != 0\n", |
| 871 | fullpath(&dirent)); |
| 872 | if (ask(1, "Correct")) { |
| 873 | p[28] = p[29] = p[30] = p[31] = 0; |
| 874 | dirent.size = 0; |
| 875 | mod |= THISMOD|FSDIRMOD; |
| 876 | } else |
| 877 | mod |= FSERROR; |
| 878 | } |
| 879 | /* |
| 880 | * handle `.' and `..' specially |
| 881 | */ |
| 882 | if (strcmp(dirent.name, ".") == 0) { |
| 883 | if (dirent.head != dir->head) { |
| 884 | pwarn("`.' entry in %s has incorrect start cluster\n", |
| 885 | fullpath(dir)); |
| 886 | if (ask(1, "Correct")) { |
| 887 | dirent.head = dir->head; |
| 888 | p[26] = (u_char)dirent.head; |
| 889 | p[27] = (u_char)(dirent.head >> 8); |
| 890 | if (boot->ClustMask == CLUST32_MASK) { |
| 891 | p[20] = (u_char)(dirent.head >> 16); |
| 892 | p[21] = (u_char)(dirent.head >> 24); |
| 893 | } |
| 894 | mod |= THISMOD|FSDIRMOD; |
| 895 | } else |
| 896 | mod |= FSERROR; |
| 897 | } |
| 898 | continue; |
Xin Li | 21386e0 | 2020-01-03 09:22:03 -0800 | [diff] [blame] | 899 | } else if (strcmp(dirent.name, "..") == 0) { |
Xin Li | 1e1dad6 | 2019-04-10 13:38:23 -0700 | [diff] [blame] | 900 | if (dir->parent) { /* XXX */ |
| 901 | if (!dir->parent->parent) { |
| 902 | if (dirent.head) { |
| 903 | pwarn("`..' entry in %s has non-zero start cluster\n", |
| 904 | fullpath(dir)); |
| 905 | if (ask(1, "Correct")) { |
| 906 | dirent.head = 0; |
| 907 | p[26] = p[27] = 0; |
| 908 | if (boot->ClustMask == CLUST32_MASK) |
| 909 | p[20] = p[21] = 0; |
| 910 | mod |= THISMOD|FSDIRMOD; |
| 911 | } else |
| 912 | mod |= FSERROR; |
| 913 | } |
| 914 | } else if (dirent.head != dir->parent->head) { |
| 915 | pwarn("`..' entry in %s has incorrect start cluster\n", |
| 916 | fullpath(dir)); |
| 917 | if (ask(1, "Correct")) { |
| 918 | dirent.head = dir->parent->head; |
| 919 | p[26] = (u_char)dirent.head; |
| 920 | p[27] = (u_char)(dirent.head >> 8); |
| 921 | if (boot->ClustMask == CLUST32_MASK) { |
| 922 | p[20] = (u_char)(dirent.head >> 16); |
| 923 | p[21] = (u_char)(dirent.head >> 24); |
| 924 | } |
| 925 | mod |= THISMOD|FSDIRMOD; |
| 926 | } else |
| 927 | mod |= FSERROR; |
| 928 | } |
| 929 | } |
| 930 | continue; |
Xin Li | 760f540 | 2019-04-10 13:39:57 -0700 | [diff] [blame] | 931 | } else { |
| 932 | /* |
| 933 | * Only one directory entry can point |
| 934 | * to dir->head, it's '.'. |
| 935 | */ |
| 936 | if (dirent.head == dir->head) { |
| 937 | pwarn("%s entry in %s has incorrect start cluster\n", |
| 938 | dirent.name, fullpath(dir)); |
| 939 | if (ask(1, "Remove")) { |
| 940 | *p = SLOT_DELETED; |
| 941 | mod |= THISMOD|FSDIRMOD; |
| 942 | } else |
| 943 | mod |= FSERROR; |
| 944 | continue; |
Xin Li | 21386e0 | 2020-01-03 09:22:03 -0800 | [diff] [blame] | 945 | } else if ((check_subdirectory(fat, |
Xin Li | 760f540 | 2019-04-10 13:39:57 -0700 | [diff] [blame] | 946 | &dirent) & FSERROR) == FSERROR) { |
| 947 | /* |
| 948 | * A subdirectory should have |
| 949 | * a dot (.) entry and a dot-dot |
| 950 | * (..) entry of ATTR_DIRECTORY, |
| 951 | * we will inspect further when |
| 952 | * traversing into it. |
| 953 | */ |
| 954 | if (ask(1, "Remove")) { |
| 955 | *p = SLOT_DELETED; |
| 956 | mod |= THISMOD|FSDIRMOD; |
| 957 | } else |
| 958 | mod |= FSERROR; |
| 959 | continue; |
| 960 | } |
Xin Li | 1e1dad6 | 2019-04-10 13:38:23 -0700 | [diff] [blame] | 961 | } |
| 962 | |
| 963 | /* create directory tree node */ |
| 964 | if (!(d = newDosDirEntry())) { |
| 965 | perr("No space for directory"); |
| 966 | return FSFATAL; |
| 967 | } |
| 968 | memcpy(d, &dirent, sizeof(struct dosDirEntry)); |
| 969 | /* link it into the tree */ |
| 970 | dir->child = d; |
| 971 | |
| 972 | /* Enter this directory into the todo list */ |
| 973 | if (!(n = newDirTodo())) { |
| 974 | perr("No space for todo list"); |
| 975 | return FSFATAL; |
| 976 | } |
| 977 | n->next = pendingDirectories; |
| 978 | n->dir = d; |
| 979 | pendingDirectories = n; |
| 980 | } else { |
Xin Li | 21386e0 | 2020-01-03 09:22:03 -0800 | [diff] [blame] | 981 | mod |= k = checksize(fat, p, &dirent); |
Xin Li | 1e1dad6 | 2019-04-10 13:38:23 -0700 | [diff] [blame] | 982 | if (k & FSDIRMOD) |
| 983 | mod |= THISMOD; |
| 984 | } |
| 985 | boot->NumFiles++; |
| 986 | } |
| 987 | |
Xin Li | 21386e0 | 2020-01-03 09:22:03 -0800 | [diff] [blame] | 988 | if (is_legacyroot) { |
| 989 | /* |
| 990 | * Don't bother to write back right now because |
| 991 | * we may continue to make modification to the |
| 992 | * non-FAT32 root directory below. |
| 993 | */ |
Xin Li | 1e1dad6 | 2019-04-10 13:38:23 -0700 | [diff] [blame] | 994 | break; |
Xin Li | 21386e0 | 2020-01-03 09:22:03 -0800 | [diff] [blame] | 995 | } else if (mod & THISMOD) { |
| 996 | if (lseek(fd, off, SEEK_SET) != off |
| 997 | || write(fd, buffer, iosize) != iosize) { |
Xin Li | 1e1dad6 | 2019-04-10 13:38:23 -0700 | [diff] [blame] | 998 | perr("Unable to write directory"); |
| 999 | return FSFATAL; |
| 1000 | } |
| 1001 | mod &= ~THISMOD; |
| 1002 | } |
Xin Li | 21386e0 | 2020-01-03 09:22:03 -0800 | [diff] [blame] | 1003 | } while (fat_is_valid_cl(fat, (cl = fat_get_cl_next(fat, cl)))); |
Xin Li | 1e1dad6 | 2019-04-10 13:38:23 -0700 | [diff] [blame] | 1004 | if (invlfn || vallfn) |
Xin Li | 21386e0 | 2020-01-03 09:22:03 -0800 | [diff] [blame] | 1005 | mod |= removede(fat, |
Xin Li | 1e1dad6 | 2019-04-10 13:38:23 -0700 | [diff] [blame] | 1006 | invlfn ? invlfn : vallfn, p, |
| 1007 | invlfn ? invcl : valcl, -1, 0, |
| 1008 | fullpath(dir), 1); |
| 1009 | |
Xin Li | 21386e0 | 2020-01-03 09:22:03 -0800 | [diff] [blame] | 1010 | /* |
| 1011 | * The root directory of non-FAT32 filesystems is in a special |
| 1012 | * area and may have been modified above removede() without |
| 1013 | * being written out. |
Xin Li | 1e1dad6 | 2019-04-10 13:38:23 -0700 | [diff] [blame] | 1014 | */ |
Xin Li | 21386e0 | 2020-01-03 09:22:03 -0800 | [diff] [blame] | 1015 | if ((mod & FSDIRMOD) && is_legacyroot) { |
| 1016 | if (lseek(fd, off, SEEK_SET) != off |
| 1017 | || write(fd, buffer, iosize) != iosize) { |
Xin Li | 1e1dad6 | 2019-04-10 13:38:23 -0700 | [diff] [blame] | 1018 | perr("Unable to write directory"); |
| 1019 | return FSFATAL; |
| 1020 | } |
| 1021 | mod &= ~THISMOD; |
| 1022 | } |
| 1023 | return mod & ~THISMOD; |
| 1024 | } |
| 1025 | |
| 1026 | int |
Xin Li | 21386e0 | 2020-01-03 09:22:03 -0800 | [diff] [blame] | 1027 | handleDirTree(struct fat_descriptor *fat) |
Xin Li | 1e1dad6 | 2019-04-10 13:38:23 -0700 | [diff] [blame] | 1028 | { |
| 1029 | int mod; |
| 1030 | |
Xin Li | 21386e0 | 2020-01-03 09:22:03 -0800 | [diff] [blame] | 1031 | mod = readDosDirSection(fat, rootDir); |
Xin Li | 1e1dad6 | 2019-04-10 13:38:23 -0700 | [diff] [blame] | 1032 | if (mod & FSFATAL) |
| 1033 | return FSFATAL; |
| 1034 | |
| 1035 | /* |
| 1036 | * process the directory todo list |
| 1037 | */ |
| 1038 | while (pendingDirectories) { |
| 1039 | struct dosDirEntry *dir = pendingDirectories->dir; |
| 1040 | struct dirTodoNode *n = pendingDirectories->next; |
| 1041 | |
| 1042 | /* |
| 1043 | * remove TODO entry now, the list might change during |
| 1044 | * directory reads |
| 1045 | */ |
| 1046 | freeDirTodo(pendingDirectories); |
| 1047 | pendingDirectories = n; |
| 1048 | |
| 1049 | /* |
| 1050 | * handle subdirectory |
| 1051 | */ |
Xin Li | 21386e0 | 2020-01-03 09:22:03 -0800 | [diff] [blame] | 1052 | mod |= readDosDirSection(fat, dir); |
Xin Li | 1e1dad6 | 2019-04-10 13:38:23 -0700 | [diff] [blame] | 1053 | if (mod & FSFATAL) |
| 1054 | return FSFATAL; |
| 1055 | } |
| 1056 | |
| 1057 | return mod; |
| 1058 | } |
| 1059 | |
| 1060 | /* |
| 1061 | * Try to reconnect a FAT chain into dir |
| 1062 | */ |
| 1063 | static u_char *lfbuf; |
| 1064 | static cl_t lfcl; |
| 1065 | static off_t lfoff; |
| 1066 | |
| 1067 | int |
Xin Li | 21386e0 | 2020-01-03 09:22:03 -0800 | [diff] [blame] | 1068 | reconnect(struct fat_descriptor *fat, cl_t head, size_t length) |
Xin Li | 1e1dad6 | 2019-04-10 13:38:23 -0700 | [diff] [blame] | 1069 | { |
Xin Li | 21386e0 | 2020-01-03 09:22:03 -0800 | [diff] [blame] | 1070 | struct bootblock *boot = fat_get_boot(fat); |
Xin Li | 1e1dad6 | 2019-04-10 13:38:23 -0700 | [diff] [blame] | 1071 | struct dosDirEntry d; |
Xin Li | 21386e0 | 2020-01-03 09:22:03 -0800 | [diff] [blame] | 1072 | int len, dosfs; |
Xin Li | 1e1dad6 | 2019-04-10 13:38:23 -0700 | [diff] [blame] | 1073 | u_char *p; |
| 1074 | |
Xin Li | 21386e0 | 2020-01-03 09:22:03 -0800 | [diff] [blame] | 1075 | dosfs = fat_get_fd(fat); |
| 1076 | |
Xin Li | 1e1dad6 | 2019-04-10 13:38:23 -0700 | [diff] [blame] | 1077 | if (!ask(1, "Reconnect")) |
| 1078 | return FSERROR; |
| 1079 | |
| 1080 | if (!lostDir) { |
| 1081 | for (lostDir = rootDir->child; lostDir; lostDir = lostDir->next) { |
| 1082 | if (!strcmp(lostDir->name, LOSTDIR)) |
| 1083 | break; |
| 1084 | } |
| 1085 | if (!lostDir) { /* Create LOSTDIR? XXX */ |
| 1086 | pwarn("No %s directory\n", LOSTDIR); |
| 1087 | return FSERROR; |
| 1088 | } |
| 1089 | } |
| 1090 | if (!lfbuf) { |
| 1091 | lfbuf = malloc(boot->ClusterSize); |
| 1092 | if (!lfbuf) { |
| 1093 | perr("No space for buffer"); |
| 1094 | return FSFATAL; |
| 1095 | } |
| 1096 | p = NULL; |
| 1097 | } else |
| 1098 | p = lfbuf; |
| 1099 | while (1) { |
| 1100 | if (p) |
| 1101 | for (; p < lfbuf + boot->ClusterSize; p += 32) |
| 1102 | if (*p == SLOT_EMPTY |
| 1103 | || *p == SLOT_DELETED) |
| 1104 | break; |
| 1105 | if (p && p < lfbuf + boot->ClusterSize) |
| 1106 | break; |
Xin Li | 21386e0 | 2020-01-03 09:22:03 -0800 | [diff] [blame] | 1107 | lfcl = p ? fat_get_cl_next(fat, lfcl) : lostDir->head; |
Xin Li | 1e1dad6 | 2019-04-10 13:38:23 -0700 | [diff] [blame] | 1108 | if (lfcl < CLUST_FIRST || lfcl >= boot->NumClusters) { |
| 1109 | /* Extend LOSTDIR? XXX */ |
| 1110 | pwarn("No space in %s\n", LOSTDIR); |
Xin Li | 760f540 | 2019-04-10 13:39:57 -0700 | [diff] [blame] | 1111 | lfcl = (lostDir->head < boot->NumClusters) ? lostDir->head : 0; |
Xin Li | 1e1dad6 | 2019-04-10 13:38:23 -0700 | [diff] [blame] | 1112 | return FSERROR; |
| 1113 | } |
Xin Li | a4cbc88 | 2019-10-01 15:09:31 -0700 | [diff] [blame] | 1114 | lfoff = (lfcl - CLUST_FIRST) * boot->ClusterSize |
| 1115 | + boot->FirstCluster * boot->bpbBytesPerSec; |
| 1116 | |
Xin Li | 1e1dad6 | 2019-04-10 13:38:23 -0700 | [diff] [blame] | 1117 | if (lseek(dosfs, lfoff, SEEK_SET) != lfoff |
| 1118 | || (size_t)read(dosfs, lfbuf, boot->ClusterSize) != boot->ClusterSize) { |
| 1119 | perr("could not read LOST.DIR"); |
| 1120 | return FSFATAL; |
| 1121 | } |
| 1122 | p = lfbuf; |
| 1123 | } |
| 1124 | |
| 1125 | boot->NumFiles++; |
| 1126 | /* Ensure uniqueness of entry here! XXX */ |
| 1127 | memset(&d, 0, sizeof d); |
| 1128 | /* worst case -1 = 4294967295, 10 digits */ |
| 1129 | len = snprintf(d.name, sizeof(d.name), "%u", head); |
| 1130 | d.flags = 0; |
| 1131 | d.head = head; |
Xin Li | 21386e0 | 2020-01-03 09:22:03 -0800 | [diff] [blame] | 1132 | d.size = length * boot->ClusterSize; |
Xin Li | 1e1dad6 | 2019-04-10 13:38:23 -0700 | [diff] [blame] | 1133 | |
| 1134 | memcpy(p, d.name, len); |
| 1135 | memset(p + len, ' ', 11 - len); |
| 1136 | memset(p + 11, 0, 32 - 11); |
| 1137 | p[26] = (u_char)d.head; |
| 1138 | p[27] = (u_char)(d.head >> 8); |
| 1139 | if (boot->ClustMask == CLUST32_MASK) { |
| 1140 | p[20] = (u_char)(d.head >> 16); |
| 1141 | p[21] = (u_char)(d.head >> 24); |
| 1142 | } |
| 1143 | p[28] = (u_char)d.size; |
| 1144 | p[29] = (u_char)(d.size >> 8); |
| 1145 | p[30] = (u_char)(d.size >> 16); |
| 1146 | p[31] = (u_char)(d.size >> 24); |
Xin Li | 1e1dad6 | 2019-04-10 13:38:23 -0700 | [diff] [blame] | 1147 | if (lseek(dosfs, lfoff, SEEK_SET) != lfoff |
| 1148 | || (size_t)write(dosfs, lfbuf, boot->ClusterSize) != boot->ClusterSize) { |
| 1149 | perr("could not write LOST.DIR"); |
| 1150 | return FSFATAL; |
| 1151 | } |
| 1152 | return FSDIRMOD; |
| 1153 | } |
| 1154 | |
| 1155 | void |
| 1156 | finishlf(void) |
| 1157 | { |
| 1158 | if (lfbuf) |
| 1159 | free(lfbuf); |
| 1160 | lfbuf = NULL; |
| 1161 | } |