1 /*
2 * Copyright (C) 1995, 1996, 1997 Wolfgang Solfrank
3 * Copyright (c) 1995 Martin Husemann
4 * Some structure declaration borrowed from Paul Popelka
5 * (paulp@uts.amdahl.com), see /sys/msdosfs/ for reference.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. All advertising materials mentioning features or use of this software
16 * must display the following acknowledgement:
17 * This product includes software developed by Martin Husemann
18 * and Wolfgang Solfrank.
19 * 4. Neither the name of the University nor the names of its contributors
20 * may be used to endorse or promote products derived from this software
21 * without specific prior written permission.
22 *
23 * THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS OR
24 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
25 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
26 * IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY DIRECT, INDIRECT,
27 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
28 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
29 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
30 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
31 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
32 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
33 */
34
35
36 #include <sys/cdefs.h>
37 #ifndef lint
38 __RCSID("$NetBSD: dir.c,v 1.14 1998/08/25 19:18:15 ross Exp $");
39 static const char rcsid[] =
40 "$FreeBSD: src/sbin/fsck_msdosfs/dir.c,v 1.3 2003/12/26 17:24:37 trhodes Exp $";
41 #endif /* not lint */
42
43 #include <stdio.h>
44 #include <stdlib.h>
45 #include <string.h>
46 #include <ctype.h>
47 #include <stdio.h>
48 #include <unistd.h>
49 #include <time.h>
50
51 #include <sys/param.h>
52
53 #include "ext.h"
54 #include "fsutil.h"
55
56 #define SLOT_EMPTY 0x00 /* slot has never been used */
57 #define SLOT_E5 0x05 /* the real value is 0xe5 */
58 #define SLOT_DELETED 0xe5 /* file in this slot deleted */
59
60 #define ATTR_NORMAL 0x00 /* normal file */
61 #define ATTR_READONLY 0x01 /* file is readonly */
62 #define ATTR_HIDDEN 0x02 /* file is hidden */
63 #define ATTR_SYSTEM 0x04 /* file is a system file */
64 #define ATTR_VOLUME 0x08 /* entry is a volume label */
65 #define ATTR_DIRECTORY 0x10 /* entry is a directory name */
66 #define ATTR_ARCHIVE 0x20 /* file is new or modified */
67
68 #define ATTR_WIN95 0x0f /* long name record */
69
70 /*
71 * This is the format of the contents of the deTime field in the direntry
72 * structure.
73 * We don't use bitfields because we don't know how compilers for
74 * arbitrary machines will lay them out.
75 */
76 #define DT_2SECONDS_MASK 0x1F /* seconds divided by 2 */
77 #define DT_2SECONDS_SHIFT 0
78 #define DT_MINUTES_MASK 0x7E0 /* minutes */
79 #define DT_MINUTES_SHIFT 5
80 #define DT_HOURS_MASK 0xF800 /* hours */
81 #define DT_HOURS_SHIFT 11
82
83 /*
84 * This is the format of the contents of the deDate field in the direntry
85 * structure.
86 */
87 #define DD_DAY_MASK 0x1F /* day of month */
88 #define DD_DAY_SHIFT 0
89 #define DD_MONTH_MASK 0x1E0 /* month */
90 #define DD_MONTH_SHIFT 5
91 #define DD_YEAR_MASK 0xFE00 /* year - 1980 */
92 #define DD_YEAR_SHIFT 9
93
94
95 /* dir.c */
96 static struct dosDirEntry *newDosDirEntry(void);
97 static void freeDosDirEntry(struct dosDirEntry *);
98 static struct dirTodoNode *newDirTodo(void);
99 static void freeDirTodo(struct dirTodoNode *);
100 static char *fullpath(struct dosDirEntry *);
101 static u_char calcShortSum(u_char *);
102 static int delete(int, struct bootblock *, struct fatEntry *, cl_t, int,
103 cl_t, int, int);
104 static int removede(int, struct bootblock *, struct fatEntry *, u_char *,
105 u_char *, cl_t, cl_t, cl_t, char *, int);
106 static int checksize(struct bootblock *, struct fatEntry *, u_char *,
107 struct dosDirEntry *);
108 static int readDosDirSection(int, struct bootblock *, struct fatEntry *,
109 struct dosDirEntry *);
110
111 /*
112 * Manage free dosDirEntry structures.
113 */
114 static struct dosDirEntry *freede;
115
116 static struct dosDirEntry *
newDosDirEntry(void)117 newDosDirEntry(void)
118 {
119 struct dosDirEntry *de;
120
121 if (!(de = freede)) {
122 if (!(de = (struct dosDirEntry *)malloc(sizeof *de)))
123 return 0;
124 } else
125 freede = de->next;
126 return de;
127 }
128
129 static void
freeDosDirEntry(struct dosDirEntry * de)130 freeDosDirEntry(struct dosDirEntry *de)
131 {
132 de->next = freede;
133 freede = de;
134 }
135
136 /*
137 * The same for dirTodoNode structures.
138 */
139 static struct dirTodoNode *freedt;
140
141 static struct dirTodoNode *
newDirTodo(void)142 newDirTodo(void)
143 {
144 struct dirTodoNode *dt;
145
146 if (!(dt = freedt)) {
147 if (!(dt = (struct dirTodoNode *)malloc(sizeof *dt)))
148 return 0;
149 } else
150 freedt = dt->next;
151 return dt;
152 }
153
154 static void
freeDirTodo(struct dirTodoNode * dt)155 freeDirTodo(struct dirTodoNode *dt)
156 {
157 dt->next = freedt;
158 freedt = dt;
159 }
160
161 /*
162 * The stack of unread directories
163 */
164 struct dirTodoNode *pendingDirectories = NULL;
165
166 /*
167 * Return the full pathname for a directory entry.
168 */
169 static char *
fullpath(struct dosDirEntry * dir)170 fullpath(struct dosDirEntry *dir)
171 {
172 static char namebuf[MAXPATHLEN + 1];
173 char *cp, *np;
174 int nl;
175
176 cp = namebuf + sizeof namebuf - 1;
177 *cp = '\0';
178 do {
179 np = dir->lname[0] ? dir->lname : dir->name;
180 nl = strlen(np);
181 if ((cp -= nl) <= namebuf + 1)
182 break;
183 memcpy(cp, np, nl);
184 *--cp = '/';
185 } while ((dir = dir->parent) != NULL);
186 if (dir)
187 *--cp = '?';
188 else
189 cp++;
190 return cp;
191 }
192
193 /*
194 * Calculate a checksum over an 8.3 alias name
195 */
196 static u_char
calcShortSum(u_char * p)197 calcShortSum(u_char *p)
198 {
199 u_char sum = 0;
200 int i;
201
202 for (i = 0; i < 11; i++) {
203 sum = (sum << 7)|(sum >> 1); /* rotate right */
204 sum += p[i];
205 }
206
207 return sum;
208 }
209
210 /*
211 * Global variables temporarily used during a directory scan
212 */
213 static char longName[DOSLONGNAMELEN] = "";
214 static u_char *buffer = NULL;
215 static u_char *delbuf = NULL;
216
217 struct dosDirEntry *rootDir;
218 static struct dosDirEntry *lostDir;
219
220 /*
221 * Init internal state for a new directory scan.
222 */
223 int
resetDosDirSection(struct bootblock * boot,struct fatEntry * fat)224 resetDosDirSection(struct bootblock *boot, struct fatEntry *fat)
225 {
226 int b1, b2;
227 cl_t cl;
228 int ret = FSOK;
229
230 b1 = boot->RootDirEnts * 32;
231 b2 = boot->SecPerClust * boot->BytesPerSec;
232
233 if (!(buffer = malloc(b1 > b2 ? b1 : b2))
234 || !(delbuf = malloc(b2))
235 || !(rootDir = newDosDirEntry())) {
236 perror("No space for directory");
237 return FSFATAL;
238 }
239 memset(rootDir, 0, sizeof *rootDir);
240 if (boot->flags & FAT32) {
241 if (boot->RootCl < CLUST_FIRST || boot->RootCl >= boot->NumClusters) {
242 pfatal("Root directory starts with cluster out of range(%u)",
243 boot->RootCl);
244 return FSFATAL;
245 }
246 cl = fat[boot->RootCl].next;
247 if (cl < CLUST_FIRST
248 || (cl >= CLUST_RSRVD && cl< CLUST_EOFS)
249 || fat[boot->RootCl].head != boot->RootCl) {
250 if (cl == CLUST_FREE)
251 pwarn("Root directory starts with free cluster\n");
252 else if (cl >= CLUST_RSRVD)
253 pwarn("Root directory starts with cluster marked %s\n",
254 rsrvdcltype(cl));
255 else {
256 pfatal("Root directory doesn't start a cluster chain");
257 return FSFATAL;
258 }
259 if (ask(1, "Fix")) {
260 fat[boot->RootCl].next = CLUST_FREE;
261 ret = FSFATMOD;
262 } else
263 ret = FSFATAL;
264 }
265
266 fat[boot->RootCl].flags |= FAT_USED;
267 rootDir->head = boot->RootCl;
268 }
269
270 return ret;
271 }
272
273 /*
274 * Cleanup after a directory scan
275 */
276 void
finishDosDirSection(void)277 finishDosDirSection(void)
278 {
279 struct dirTodoNode *p, *np;
280 struct dosDirEntry *d, *nd;
281
282 for (p = pendingDirectories; p; p = np) {
283 np = p->next;
284 freeDirTodo(p);
285 }
286 pendingDirectories = 0;
287 for (d = rootDir; d; d = nd) {
288 if ((nd = d->child) != NULL) {
289 d->child = 0;
290 continue;
291 }
292 if (!(nd = d->next))
293 nd = d->parent;
294 freeDosDirEntry(d);
295 }
296 rootDir = lostDir = NULL;
297 free(buffer);
298 free(delbuf);
299 buffer = NULL;
300 delbuf = NULL;
301 }
302
303 /*
304 * Delete directory entries between startcl, startoff and endcl, endoff.
305 */
306 static int
delete(int f,struct bootblock * boot,struct fatEntry * fat,cl_t startcl,int startoff,cl_t endcl,int endoff,int notlast)307 delete(int f, struct bootblock *boot, struct fatEntry *fat, cl_t startcl,
308 int startoff, cl_t endcl, int endoff, int notlast)
309 {
310 u_char *s, *e;
311 loff_t off;
312 int clsz = boot->SecPerClust * boot->BytesPerSec;
313
314 s = delbuf + startoff;
315 e = delbuf + clsz;
316 while (startcl >= CLUST_FIRST && startcl < boot->NumClusters) {
317 if (startcl == endcl) {
318 if (notlast)
319 break;
320 e = delbuf + endoff;
321 }
322 off = startcl * boot->SecPerClust + boot->ClusterOffset;
323 off *= boot->BytesPerSec;
324 if (lseek(f, off, SEEK_SET) != off
325 || read(f, delbuf, clsz) != clsz) {
326 perror("Unable to read directory");
327 return FSFATAL;
328 }
329 while (s < e) {
330 *s = SLOT_DELETED;
331 s += 32;
332 }
333 if (lseek(f, off, SEEK_SET) != off
334 || write(f, delbuf, clsz) != clsz) {
335 perror("Unable to write directory");
336 return FSFATAL;
337 }
338 if (startcl == endcl)
339 break;
340 startcl = fat[startcl].next;
341 s = delbuf;
342 }
343 return FSOK;
344 }
345
346 static int
removede(int f,struct bootblock * boot,struct fatEntry * fat,u_char * start,u_char * end,cl_t startcl,cl_t endcl,cl_t curcl,char * path,int type)347 removede(int f, struct bootblock *boot, struct fatEntry *fat, u_char *start,
348 u_char *end, cl_t startcl, cl_t endcl, cl_t curcl, char *path, int type)
349 {
350 switch (type) {
351 case 0:
352 pwarn("Invalid long filename entry for %s\n", path);
353 break;
354 case 1:
355 pwarn("Invalid long filename entry at end of directory %s\n", path);
356 break;
357 case 2:
358 pwarn("Invalid long filename entry for volume label\n");
359 break;
360 }
361 if (ask(1, "Remove")) {
362 if (startcl != curcl) {
363 if (delete(f, boot, fat,
364 startcl, start - buffer,
365 endcl, end - buffer,
366 endcl == curcl) == FSFATAL)
367 return FSFATAL;
368 start = buffer;
369 }
370 if (endcl == curcl)
371 for (; start < end; start += 32)
372 *start = SLOT_DELETED;
373 return FSDIRMOD;
374 }
375 return FSERROR;
376 }
377
378 /*
379 * Check an in-memory file entry
380 */
381 static int
checksize(struct bootblock * boot,struct fatEntry * fat,u_char * p,struct dosDirEntry * dir)382 checksize(struct bootblock *boot, struct fatEntry *fat, u_char *p,
383 struct dosDirEntry *dir)
384 {
385 /*
386 * Check size on ordinary files
387 */
388 int32_t physicalSize;
389
390 if (dir->head == CLUST_FREE)
391 physicalSize = 0;
392 else {
393 if (dir->head < CLUST_FIRST || dir->head >= boot->NumClusters)
394 return FSERROR;
395 physicalSize = fat[dir->head].length * boot->ClusterSize;
396 }
397 if (physicalSize < dir->size) {
398 pwarn("size of %s is %u, should at most be %u\n",
399 fullpath(dir), dir->size, physicalSize);
400 if (ask(1, "Truncate")) {
401 dir->size = physicalSize;
402 p[28] = (u_char)physicalSize;
403 p[29] = (u_char)(physicalSize >> 8);
404 p[30] = (u_char)(physicalSize >> 16);
405 p[31] = (u_char)(physicalSize >> 24);
406 return FSDIRMOD;
407 } else
408 return FSERROR;
409 } else if (physicalSize - dir->size >= boot->ClusterSize) {
410 pwarn("%s has too many clusters allocated\n",
411 fullpath(dir));
412 if (ask(1, "Drop superfluous clusters")) {
413 cl_t cl;
414 u_int32_t sz = 0;
415
416 for (cl = dir->head; (sz += boot->ClusterSize) < dir->size;)
417 cl = fat[cl].next;
418 clearchain(boot, fat, fat[cl].next);
419 fat[cl].next = CLUST_EOF;
420 return FSFATMOD;
421 } else
422 return FSERROR;
423 }
424 return FSOK;
425 }
426
427 /*
428 * Read a directory and
429 * - resolve long name records
430 * - enter file and directory records into the parent's list
431 * - push directories onto the todo-stack
432 */
433 static int
readDosDirSection(int f,struct bootblock * boot,struct fatEntry * fat,struct dosDirEntry * dir)434 readDosDirSection(int f, struct bootblock *boot, struct fatEntry *fat,
435 struct dosDirEntry *dir)
436 {
437 struct dosDirEntry dirent, *d;
438 u_char *p, *vallfn, *invlfn, *empty;
439 loff_t off;
440 int i, j, k, last;
441 cl_t cl, valcl = ~0, invcl = ~0, empcl = ~0;
442 char *t;
443 u_int lidx = 0;
444 int shortSum;
445 int mod = FSOK;
446 #define THISMOD 0x8000 /* Only used within this routine */
447
448 cl = dir->head;
449 if (dir->parent && (cl < CLUST_FIRST || cl >= boot->NumClusters)) {
450 /*
451 * Already handled somewhere else.
452 */
453 return FSOK;
454 }
455 shortSum = -1;
456 vallfn = invlfn = empty = NULL;
457 do {
458 if (!(boot->flags & FAT32) && !dir->parent) {
459 last = boot->RootDirEnts * 32;
460 off = boot->ResSectors + boot->FATs * boot->FATsecs;
461 } else {
462 last = boot->SecPerClust * boot->BytesPerSec;
463 off = cl * boot->SecPerClust + boot->ClusterOffset;
464 }
465
466 off *= boot->BytesPerSec;
467 if (lseek64(f, off, SEEK_SET) != off) {
468 printf("off = %llu\n", off);
469 perror("Unable to lseek64");
470 return FSFATAL;
471 }
472 if (read(f, buffer, last) != last) {
473 perror("Unable to read");
474 return FSFATAL;
475 }
476 last /= 32;
477 /*
478 * Check `.' and `..' entries here? XXX
479 */
480 for (p = buffer, i = 0; i < last; i++, p += 32) {
481 if (dir->fsckflags & DIREMPWARN) {
482 *p = SLOT_EMPTY;
483 continue;
484 }
485
486 if (*p == SLOT_EMPTY || *p == SLOT_DELETED) {
487 if (*p == SLOT_EMPTY) {
488 dir->fsckflags |= DIREMPTY;
489 empty = p;
490 empcl = cl;
491 }
492 continue;
493 }
494
495 if (dir->fsckflags & DIREMPTY) {
496 if (!(dir->fsckflags & DIREMPWARN)) {
497 pwarn("%s has entries after end of directory\n",
498 fullpath(dir));
499 if (ask(1, "Extend")) {
500 u_char *q;
501
502 dir->fsckflags &= ~DIREMPTY;
503 if (delete(f, boot, fat,
504 empcl, empty - buffer,
505 cl, p - buffer, 1) == FSFATAL)
506 return FSFATAL;
507 q = empcl == cl ? empty : buffer;
508 for (; q < p; q += 32)
509 *q = SLOT_DELETED;
510 mod |= THISMOD|FSDIRMOD;
511 } else if (ask(1, "Truncate"))
512 dir->fsckflags |= DIREMPWARN;
513 }
514 if (dir->fsckflags & DIREMPWARN) {
515 *p = SLOT_DELETED;
516 mod |= THISMOD|FSDIRMOD;
517 continue;
518 } else if (dir->fsckflags & DIREMPTY)
519 mod |= FSERROR;
520 empty = NULL;
521 }
522
523 if (p[11] == ATTR_WIN95) {
524 if (*p & LRFIRST) {
525 if (shortSum != -1) {
526 if (!invlfn) {
527 invlfn = vallfn;
528 invcl = valcl;
529 }
530 }
531 memset(longName, 0, sizeof longName);
532 shortSum = p[13];
533 vallfn = p;
534 valcl = cl;
535 } else if (shortSum != p[13]
536 || lidx != (*p & LRNOMASK)) {
537 if (!invlfn) {
538 invlfn = vallfn;
539 invcl = valcl;
540 }
541 if (!invlfn) {
542 invlfn = p;
543 invcl = cl;
544 }
545 vallfn = NULL;
546 }
547 lidx = *p & LRNOMASK;
548 t = longName + --lidx * 13;
549 for (k = 1; k < 11 && t < longName + sizeof(longName); k += 2) {
550 if (!p[k] && !p[k + 1])
551 break;
552 *t++ = p[k];
553 /*
554 * Warn about those unusable chars in msdosfs here? XXX
555 */
556 if (p[k + 1])
557 t[-1] = '?';
558 }
559 if (k >= 11)
560 for (k = 14; k < 26 && t < longName + sizeof(longName); k += 2) {
561 if (!p[k] && !p[k + 1])
562 break;
563 *t++ = p[k];
564 if (p[k + 1])
565 t[-1] = '?';
566 }
567 if (k >= 26)
568 for (k = 28; k < 32 && t < longName + sizeof(longName); k += 2) {
569 if (!p[k] && !p[k + 1])
570 break;
571 *t++ = p[k];
572 if (p[k + 1])
573 t[-1] = '?';
574 }
575 if (t >= longName + sizeof(longName)) {
576 pwarn("long filename too long\n");
577 if (!invlfn) {
578 invlfn = vallfn;
579 invcl = valcl;
580 }
581 vallfn = NULL;
582 }
583 if (p[26] | (p[27] << 8)) {
584 pwarn("long filename record cluster start != 0\n");
585 if (!invlfn) {
586 invlfn = vallfn;
587 invcl = cl;
588 }
589 vallfn = NULL;
590 }
591 continue; /* long records don't carry further
592 * information */
593 }
594
595 /*
596 * This is a standard msdosfs directory entry.
597 */
598 memset(&dirent, 0, sizeof dirent);
599
600 /*
601 * it's a short name record, but we need to know
602 * more, so get the flags first.
603 */
604 dirent.flags = p[11];
605
606 /*
607 * Translate from 850 to ISO here XXX
608 */
609 for (j = 0; j < 8; j++)
610 dirent.name[j] = p[j];
611 dirent.name[8] = '\0';
612 for (k = 7; k >= 0 && dirent.name[k] == ' '; k--)
613 dirent.name[k] = '\0';
614 if (dirent.name[k] != '\0')
615 k++;
616 if (dirent.name[0] == SLOT_E5)
617 dirent.name[0] = 0xe5;
618
619 if (dirent.flags & ATTR_VOLUME) {
620 if (vallfn || invlfn) {
621 mod |= removede(f, boot, fat,
622 invlfn ? invlfn : vallfn, p,
623 invlfn ? invcl : valcl, -1, 0,
624 fullpath(dir), 2);
625 vallfn = NULL;
626 invlfn = NULL;
627 }
628 continue;
629 }
630
631 if (p[8] != ' ')
632 dirent.name[k++] = '.';
633 for (j = 0; j < 3; j++)
634 dirent.name[k++] = p[j+8];
635 dirent.name[k] = '\0';
636 for (k--; k >= 0 && dirent.name[k] == ' '; k--)
637 dirent.name[k] = '\0';
638
639 if (vallfn && shortSum != calcShortSum(p)) {
640 if (!invlfn) {
641 invlfn = vallfn;
642 invcl = valcl;
643 }
644 vallfn = NULL;
645 }
646 dirent.head = p[26] | (p[27] << 8);
647 if (boot->ClustMask == CLUST32_MASK)
648 dirent.head |= (p[20] << 16) | (p[21] << 24);
649 dirent.size = p[28] | (p[29] << 8) | (p[30] << 16) | (p[31] << 24);
650 if (vallfn) {
651 strcpy(dirent.lname, longName);
652 longName[0] = '\0';
653 shortSum = -1;
654 }
655
656 dirent.parent = dir;
657 dirent.next = dir->child;
658
659 if (invlfn) {
660 mod |= k = removede(f, boot, fat,
661 invlfn, vallfn ? vallfn : p,
662 invcl, vallfn ? valcl : cl, cl,
663 fullpath(&dirent), 0);
664 if (mod & FSFATAL)
665 return FSFATAL;
666 if (vallfn
667 ? (valcl == cl && vallfn != buffer)
668 : p != buffer)
669 if (k & FSDIRMOD)
670 mod |= THISMOD;
671 }
672
673 vallfn = NULL; /* not used any longer */
674 invlfn = NULL;
675
676 if (dirent.size == 0 && !(dirent.flags & ATTR_DIRECTORY)) {
677 if (dirent.head != 0) {
678 pwarn("%s has clusters, but size 0\n",
679 fullpath(&dirent));
680 if (ask(1, "Drop allocated clusters")) {
681 p[26] = p[27] = 0;
682 if (boot->ClustMask == CLUST32_MASK)
683 p[20] = p[21] = 0;
684 clearchain(boot, fat, dirent.head);
685 dirent.head = 0;
686 mod |= THISMOD|FSDIRMOD|FSFATMOD;
687 } else
688 mod |= FSERROR;
689 }
690 } else if (dirent.head == 0
691 && !strcmp(dirent.name, "..")
692 && dir->parent /* XXX */
693 && !dir->parent->parent) {
694 /*
695 * Do nothing, the parent is the root
696 */
697 } else if (dirent.head < CLUST_FIRST
698 || dirent.head >= boot->NumClusters
699 || fat[dirent.head].next == CLUST_FREE
700 || (fat[dirent.head].next >= CLUST_RSRVD
701 && fat[dirent.head].next < CLUST_EOFS)
702 || fat[dirent.head].head != dirent.head) {
703 if (dirent.head == 0)
704 pwarn("%s has no clusters\n",
705 fullpath(&dirent));
706 else if (dirent.head < CLUST_FIRST
707 || dirent.head >= boot->NumClusters)
708 pwarn("%s starts with cluster out of range(%u)\n",
709 fullpath(&dirent),
710 dirent.head);
711 else if (fat[dirent.head].next == CLUST_FREE)
712 pwarn("%s starts with free cluster\n",
713 fullpath(&dirent));
714 else if (fat[dirent.head].next >= CLUST_RSRVD)
715 pwarn("%s starts with cluster marked %s\n",
716 fullpath(&dirent),
717 rsrvdcltype(fat[dirent.head].next));
718 else
719 pwarn("%s doesn't start a cluster chain\n",
720 fullpath(&dirent));
721 if (dirent.flags & ATTR_DIRECTORY) {
722 if (ask(1, "Remove")) {
723 *p = SLOT_DELETED;
724 mod |= THISMOD|FSDIRMOD;
725 } else
726 mod |= FSERROR;
727 continue;
728 } else {
729 if (ask(1, "Truncate")) {
730 p[28] = p[29] = p[30] = p[31] = 0;
731 p[26] = p[27] = 0;
732 if (boot->ClustMask == CLUST32_MASK)
733 p[20] = p[21] = 0;
734 dirent.size = 0;
735 mod |= THISMOD|FSDIRMOD;
736 } else
737 mod |= FSERROR;
738 }
739 }
740
741 if (dirent.head >= CLUST_FIRST && dirent.head < boot->NumClusters)
742 fat[dirent.head].flags |= FAT_USED;
743
744 if (dirent.flags & ATTR_DIRECTORY) {
745 /*
746 * gather more info for directories
747 */
748 struct dirTodoNode *n;
749
750 if (dirent.size) {
751 pwarn("Directory %s has size != 0\n",
752 fullpath(&dirent));
753 if (ask(1, "Correct")) {
754 p[28] = p[29] = p[30] = p[31] = 0;
755 dirent.size = 0;
756 mod |= THISMOD|FSDIRMOD;
757 } else
758 mod |= FSERROR;
759 }
760 /*
761 * handle `.' and `..' specially
762 */
763 if (strcmp(dirent.name, ".") == 0) {
764 if (dirent.head != dir->head) {
765 pwarn("`.' entry in %s has incorrect start cluster\n",
766 fullpath(dir));
767 if (ask(1, "Correct")) {
768 dirent.head = dir->head;
769 p[26] = (u_char)dirent.head;
770 p[27] = (u_char)(dirent.head >> 8);
771 if (boot->ClustMask == CLUST32_MASK) {
772 p[20] = (u_char)(dirent.head >> 16);
773 p[21] = (u_char)(dirent.head >> 24);
774 }
775 mod |= THISMOD|FSDIRMOD;
776 } else
777 mod |= FSERROR;
778 }
779 continue;
780 }
781 if (strcmp(dirent.name, "..") == 0) {
782 if (dir->parent) { /* XXX */
783 if (!dir->parent->parent) {
784 if (dirent.head) {
785 pwarn("`..' entry in %s has non-zero start cluster\n",
786 fullpath(dir));
787 if (ask(1, "Correct")) {
788 dirent.head = 0;
789 p[26] = p[27] = 0;
790 if (boot->ClustMask == CLUST32_MASK)
791 p[20] = p[21] = 0;
792 mod |= THISMOD|FSDIRMOD;
793 } else
794 mod |= FSERROR;
795 }
796 } else if (dirent.head != dir->parent->head) {
797 pwarn("`..' entry in %s has incorrect start cluster\n",
798 fullpath(dir));
799 if (ask(1, "Correct")) {
800 dirent.head = dir->parent->head;
801 p[26] = (u_char)dirent.head;
802 p[27] = (u_char)(dirent.head >> 8);
803 if (boot->ClustMask == CLUST32_MASK) {
804 p[20] = (u_char)(dirent.head >> 16);
805 p[21] = (u_char)(dirent.head >> 24);
806 }
807 mod |= THISMOD|FSDIRMOD;
808 } else
809 mod |= FSERROR;
810 }
811 }
812 continue;
813 }
814
815 /* create directory tree node */
816 if (!(d = newDosDirEntry())) {
817 perror("No space for directory");
818 return FSFATAL;
819 }
820 memcpy(d, &dirent, sizeof(struct dosDirEntry));
821 /* link it into the tree */
822 dir->child = d;
823
824 /* Enter this directory into the todo list */
825 if (!(n = newDirTodo())) {
826 perror("No space for todo list");
827 return FSFATAL;
828 }
829 n->next = pendingDirectories;
830 n->dir = d;
831 pendingDirectories = n;
832 } else {
833 mod |= k = checksize(boot, fat, p, &dirent);
834 if (k & FSDIRMOD)
835 mod |= THISMOD;
836 }
837 boot->NumFiles++;
838 }
839 if (mod & THISMOD) {
840 last *= 32;
841 if (lseek64(f, off, SEEK_SET) != off
842 || write(f, buffer, last) != last) {
843 perror("Unable to write directory");
844 return FSFATAL;
845 }
846 mod &= ~THISMOD;
847 }
848 } while ((cl = fat[cl].next) >= CLUST_FIRST && cl < boot->NumClusters);
849 if (invlfn || vallfn)
850 mod |= removede(f, boot, fat,
851 invlfn ? invlfn : vallfn, p,
852 invlfn ? invcl : valcl, -1, 0,
853 fullpath(dir), 1);
854 return mod & ~THISMOD;
855 }
856
857 int
handleDirTree(int dosfs,struct bootblock * boot,struct fatEntry * fat)858 handleDirTree(int dosfs, struct bootblock *boot, struct fatEntry *fat)
859 {
860 int mod;
861
862 mod = readDosDirSection(dosfs, boot, fat, rootDir);
863 if (mod & FSFATAL)
864 return FSFATAL;
865
866 /*
867 * process the directory todo list
868 */
869 while (pendingDirectories) {
870 struct dosDirEntry *dir = pendingDirectories->dir;
871 struct dirTodoNode *n = pendingDirectories->next;
872
873 /*
874 * remove TODO entry now, the list might change during
875 * directory reads
876 */
877 freeDirTodo(pendingDirectories);
878 pendingDirectories = n;
879
880 /*
881 * handle subdirectory
882 */
883 mod |= readDosDirSection(dosfs, boot, fat, dir);
884 if (mod & FSFATAL)
885 return FSFATAL;
886 }
887
888 return mod;
889 }
890
891 /*
892 * Try to reconnect a FAT chain into dir
893 */
894 static u_char *lfbuf;
895 static cl_t lfcl;
896 static loff_t lfoff;
897
898 int
reconnect(int dosfs,struct bootblock * boot,struct fatEntry * fat,cl_t head)899 reconnect(int dosfs, struct bootblock *boot, struct fatEntry *fat, cl_t head)
900 {
901 struct dosDirEntry d;
902 u_char *p;
903
904 if (!ask(1, "Reconnect"))
905 return FSERROR;
906
907 if (!lostDir) {
908 for (lostDir = rootDir->child; lostDir; lostDir = lostDir->next) {
909 if (!strcmp(lostDir->name, LOSTDIR))
910 break;
911 }
912 if (!lostDir) { /* Create LOSTDIR? XXX */
913 pwarn("No %s directory\n", LOSTDIR);
914 return FSERROR;
915 }
916 }
917 if (!lfbuf) {
918 lfbuf = malloc(boot->ClusterSize);
919 if (!lfbuf) {
920 perror("No space for buffer");
921 return FSFATAL;
922 }
923 p = NULL;
924 } else
925 p = lfbuf;
926 while (1) {
927 if (p)
928 for (; p < lfbuf + boot->ClusterSize; p += 32)
929 if (*p == SLOT_EMPTY
930 || *p == SLOT_DELETED)
931 break;
932 if (p && p < lfbuf + boot->ClusterSize)
933 break;
934 lfcl = p ? fat[lfcl].next : lostDir->head;
935 if (lfcl < CLUST_FIRST || lfcl >= boot->NumClusters) {
936 /* Extend LOSTDIR? XXX */
937 pwarn("No space in %s\n", LOSTDIR);
938 lfcl = (lostDir->head < boot->NumClusters) ? lostDir->head : 0;
939 return FSERROR;
940 }
941 lfoff = lfcl * boot->ClusterSize
942 + boot->ClusterOffset * boot->BytesPerSec;
943 if (lseek64(dosfs, lfoff, SEEK_SET) != lfoff
944 || read(dosfs, lfbuf, boot->ClusterSize) != boot->ClusterSize) {
945 perror("could not read LOST.DIR");
946 return FSFATAL;
947 }
948 p = lfbuf;
949 }
950
951 boot->NumFiles++;
952 /* Ensure uniqueness of entry here! XXX */
953 memset(&d, 0, sizeof d);
954 (void)snprintf(d.name, sizeof(d.name), "%u", head);
955 d.flags = 0;
956 d.head = head;
957 d.size = fat[head].length * boot->ClusterSize;
958
959 memset(p, 0, 32);
960 memset(p, ' ', 11);
961 memcpy(p, d.name, strlen(d.name));
962 p[26] = (u_char)d.head;
963 p[27] = (u_char)(d.head >> 8);
964 if (boot->ClustMask == CLUST32_MASK) {
965 p[20] = (u_char)(d.head >> 16);
966 p[21] = (u_char)(d.head >> 24);
967 }
968 p[28] = (u_char)d.size;
969 p[29] = (u_char)(d.size >> 8);
970 p[30] = (u_char)(d.size >> 16);
971 p[31] = (u_char)(d.size >> 24);
972 fat[head].flags |= FAT_USED;
973 if (lseek64(dosfs, lfoff, SEEK_SET) != lfoff
974 || write(dosfs, lfbuf, boot->ClusterSize) != boot->ClusterSize) {
975 perror("could not write LOST.DIR");
976 return FSFATAL;
977 }
978 return FSDIRMOD;
979 }
980
981 void
finishlf(void)982 finishlf(void)
983 {
984 if (lfbuf)
985 free(lfbuf);
986 lfbuf = NULL;
987 }
988