sbin/fsck_msdosfs/dir.c

   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  *
  16  * THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS OR
  17  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  18  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  19  * IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY DIRECT, INDIRECT,
  20  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  21  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  22  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  23  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  24  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  25  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  26  */
  27
  28
  29 #include <sys/cdefs.h>
  30 #ifndef lint
  31 __RCSID("$NetBSD: dir.c,v 1.14 1998/08/25 19:18:15 ross Exp $");
  32 static const char rcsid[] =
  33   "$FreeBSD$";
  34 #endif /* not lint */
  35
  36 #include <stdio.h>
  37 #include <stdlib.h>
  38 #include <string.h>
  39 #include <ctype.h>
  40 #include <unistd.h>
  41 #include <time.h>
  42
  43 #include <sys/param.h>
  44
  45 #include "ext.h"
  46 #include "fsutil.h"
  47
  48 #define SLOT_EMPTY      0x00            /* slot has never been used */
  49 #define SLOT_E5         0x05            /* the real value is 0xe5 */
  50 #define SLOT_DELETED    0xe5            /* file in this slot deleted */
  51
  52 #define ATTR_NORMAL     0x00            /* normal file */
  53 #define ATTR_READONLY   0x01            /* file is readonly */
  54 #define ATTR_HIDDEN     0x02            /* file is hidden */
  55 #define ATTR_SYSTEM     0x04            /* file is a system file */
  56 #define ATTR_VOLUME     0x08            /* entry is a volume label */
  57 #define ATTR_DIRECTORY  0x10            /* entry is a directory name */
  58 #define ATTR_ARCHIVE    0x20            /* file is new or modified */
  59
  60 #define ATTR_WIN95      0x0f            /* long name record */
  61
  62 /*
  63  * This is the format of the contents of the deTime field in the direntry
  64  * structure.
  65  * We don't use bitfields because we don't know how compilers for
  66  * arbitrary machines will lay them out.
  67  */
  68 #define DT_2SECONDS_MASK        0x1F    /* seconds divided by 2 */
  69 #define DT_2SECONDS_SHIFT       0
  70 #define DT_MINUTES_MASK         0x7E0   /* minutes */
  71 #define DT_MINUTES_SHIFT        5
  72 #define DT_HOURS_MASK           0xF800  /* hours */
  73 #define DT_HOURS_SHIFT          11
  74
  75 /*
  76  * This is the format of the contents of the deDate field in the direntry
  77  * structure.
  78  */
  79 #define DD_DAY_MASK             0x1F    /* day of month */
  80 #define DD_DAY_SHIFT            0
  81 #define DD_MONTH_MASK           0x1E0   /* month */
  82 #define DD_MONTH_SHIFT          5
  83 #define DD_YEAR_MASK            0xFE00  /* year - 1980 */
  84 #define DD_YEAR_SHIFT           9
  85
  86
  87 /* dir.c */
  88 static struct dosDirEntry *newDosDirEntry(void);
  89 static void freeDosDirEntry(struct dosDirEntry *);
  90 static struct dirTodoNode *newDirTodo(void);
  91 static void freeDirTodo(struct dirTodoNode *);
  92 static char *fullpath(struct dosDirEntry *);
  93 static u_char calcShortSum(u_char *);
  94 static int delete(int, struct bootblock *, struct fatEntry *, cl_t, int,
  95     cl_t, int, int);
  96 static int removede(int, struct bootblock *, struct fatEntry *, u_char *,
  97     u_char *, cl_t, cl_t, cl_t, char *, int);
  98 static int checksize(struct bootblock *, struct fatEntry *, u_char *,
  99     struct dosDirEntry *);
 100 static int readDosDirSection(int, struct bootblock *, struct fatEntry *,
 101     struct dosDirEntry *);
 102
 103 /*
 104  * Manage free dosDirEntry structures.
 105  */
 106 static struct dosDirEntry *freede;
 107
 108 static struct dosDirEntry *
 109 newDosDirEntry(void)
 110 {
 111         struct dosDirEntry *de;
 112
 113         if (!(de = freede)) {
 114                 if (!(de = (struct dosDirEntry *)malloc(sizeof *de)))
 115                         return 0;
 116         } else
 117                 freede = de->next;
 118         return de;
 119 }
 120
 121 static void
 122 freeDosDirEntry(struct dosDirEntry *de)
 123 {
 124         de->next = freede;
 125         freede = de;
 126 }
 127
 128 /*
 129  * The same for dirTodoNode structures.
 130  */
 131 static struct dirTodoNode *freedt;
 132
 133 static struct dirTodoNode *
 134 newDirTodo(void)
 135 {
 136         struct dirTodoNode *dt;
 137
 138         if (!(dt = freedt)) {
 139                 if (!(dt = (struct dirTodoNode *)malloc(sizeof *dt)))
 140                         return 0;
 141         } else
 142                 freedt = dt->next;
 143         return dt;
 144 }
 145
 146 static void
 147 freeDirTodo(struct dirTodoNode *dt)
 148 {
 149         dt->next = freedt;
 150         freedt = dt;
 151 }
 152
 153 /*
 154  * The stack of unread directories
 155  */
 156 struct dirTodoNode *pendingDirectories = NULL;
 157
 158 /*
 159  * Return the full pathname for a directory entry.
 160  */
 161 static char *
 162 fullpath(struct dosDirEntry *dir)
 163 {
 164         static char namebuf[MAXPATHLEN + 1];
 165         char *cp, *np;
 166         int nl;
 167
 168         cp = namebuf + sizeof namebuf - 1;
 169         *cp = '\0';
 170         do {
 171                 np = dir->lname[0] ? dir->lname : dir->name;
 172                 nl = strlen(np);
 173                 if ((cp -= nl) <= namebuf + 1)
 174                         break;
 175                 memcpy(cp, np, nl);
 176                 *--cp = '/';
 177         } while ((dir = dir->parent) != NULL);
 178         if (dir)
 179                 *--cp = '?';
 180         else
 181                 cp++;
 182         return cp;
 183 }
 184
 185 /*
 186  * Calculate a checksum over an 8.3 alias name
 187  */
 188 static u_char
 189 calcShortSum(u_char *p)
 190 {
 191         u_char sum = 0;
 192         int i;
 193
 194         for (i = 0; i < 11; i++) {
 195                 sum = (sum << 7)|(sum >> 1);    /* rotate right */
 196                 sum += p[i];
 197         }
 198
 199         return sum;
 200 }
 201
 202 /*
 203  * Global variables temporarily used during a directory scan
 204  */
 205 static char longName[DOSLONGNAMELEN] = "";
 206 static u_char *buffer = NULL;
 207 static u_char *delbuf = NULL;
 208
 209 struct dosDirEntry *rootDir;
 210 static struct dosDirEntry *lostDir;
 211
 212 /*
 213  * Init internal state for a new directory scan.
 214  */
 215 int
 216 resetDosDirSection(struct bootblock *boot, struct fatEntry *fat)
 217 {
 218         int b1, b2;
 219         cl_t cl;
 220         int ret = FSOK;
 221
 222         b1 = boot->bpbRootDirEnts * 32;
 223         b2 = boot->bpbSecPerClust * boot->bpbBytesPerSec;
 224
 225         if ((buffer = malloc( b1 > b2 ? b1 : b2)) == NULL) {
 226                 perror("No space for directory buffer");
 227                 return FSFATAL;
 228         }
 229
 230         if ((delbuf = malloc(b2)) == NULL) {
 231                 free(buffer);
 232                 perror("No space for directory delbuf");
 233                 return FSFATAL;
 234         }
 235
 236         if ((rootDir = newDosDirEntry()) == NULL) {
 237                 free(buffer);
 238                 free(delbuf);
 239                 perror("No space for directory entry");
 240                 return FSFATAL;
 241         }
 242
 243         memset(rootDir, 0, sizeof *rootDir);
 244         if (boot->flags & FAT32) {
 245                 if (boot->bpbRootClust < CLUST_FIRST ||
 246                     boot->bpbRootClust >= boot->NumClusters) {
 247                         pfatal("Root directory starts with cluster out of range(%u)",
 248                                boot->bpbRootClust);
 249                         return FSFATAL;
 250                 }
 251                 cl = fat[boot->bpbRootClust].next;
 252                 if (cl < CLUST_FIRST
 253                     || (cl >= CLUST_RSRVD && cl< CLUST_EOFS)
 254                     || fat[boot->bpbRootClust].head != boot->bpbRootClust) {
 255                         if (cl == CLUST_FREE)
 256                                 pwarn("Root directory starts with free cluster\n");
 257                         else if (cl >= CLUST_RSRVD)
 258                                 pwarn("Root directory starts with cluster marked %s\n",
 259                                       rsrvdcltype(cl));
 260                         else {
 261                                 pfatal("Root directory doesn't start a cluster chain");
 262                                 return FSFATAL;
 263                         }
 264                         if (ask(1, "Fix")) {
 265                                 fat[boot->bpbRootClust].next = CLUST_FREE;
 266                                 ret = FSFATMOD;
 267                         } else
 268                                 ret = FSFATAL;
 269                 }
 270
 271                 fat[boot->bpbRootClust].flags |= FAT_USED;
 272                 rootDir->head = boot->bpbRootClust;
 273         }
 274
 275         return ret;
 276 }
 277
 278 /*
 279  * Cleanup after a directory scan
 280  */
 281 void
 282 finishDosDirSection(void)
 283 {
 284         struct dirTodoNode *p, *np;
 285         struct dosDirEntry *d, *nd;
 286
 287         for (p = pendingDirectories; p; p = np) {
 288                 np = p->next;
 289                 freeDirTodo(p);
 290         }
 291         pendingDirectories = 0;
 292         for (d = rootDir; d; d = nd) {
 293                 if ((nd = d->child) != NULL) {
 294                         d->child = 0;
 295                         continue;
 296                 }
 297                 if (!(nd = d->next))
 298                         nd = d->parent;
 299                 freeDosDirEntry(d);
 300         }
 301         rootDir = lostDir = NULL;
 302         free(buffer);
 303         free(delbuf);
 304         buffer = NULL;
 305         delbuf = NULL;
 306 }
 307
 308 /*
 309  * Delete directory entries between startcl, startoff and endcl, endoff.
 310  */
 311 static int
 312 delete(int f, struct bootblock *boot, struct fatEntry *fat, cl_t startcl,
 313     int startoff, cl_t endcl, int endoff, int notlast)
 314 {
 315         u_char *s, *e;
 316         off_t off;
 317         int clsz = boot->bpbSecPerClust * boot->bpbBytesPerSec;
 318
 319         s = delbuf + startoff;
 320         e = delbuf + clsz;
 321         while (startcl >= CLUST_FIRST && startcl < boot->NumClusters) {
 322                 if (startcl == endcl) {
 323                         if (notlast)
 324                                 break;
 325                         e = delbuf + endoff;
 326                 }
 327                 off = startcl * boot->bpbSecPerClust + boot->ClusterOffset;
 328                 off *= boot->bpbBytesPerSec;
 329                 if (lseek(f, off, SEEK_SET) != off
 330                     || read(f, delbuf, clsz) != clsz) {
 331                         perror("Unable to read directory");
 332                         return FSFATAL;
 333                 }
 334                 while (s < e) {
 335                         *s = SLOT_DELETED;
 336                         s += 32;
 337                 }
 338                 if (lseek(f, off, SEEK_SET) != off
 339                     || write(f, delbuf, clsz) != clsz) {
 340                         perror("Unable to write directory");
 341                         return FSFATAL;
 342                 }
 343                 if (startcl == endcl)
 344                         break;
 345                 startcl = fat[startcl].next;
 346                 s = delbuf;
 347         }
 348         return FSOK;
 349 }
 350
 351 static int
 352 removede(int f, struct bootblock *boot, struct fatEntry *fat, u_char *start,
 353     u_char *end, cl_t startcl, cl_t endcl, cl_t curcl, char *path, int type)
 354 {
 355         switch (type) {
 356         case 0:
 357                 pwarn("Invalid long filename entry for %s\n", path);
 358                 break;
 359         case 1:
 360                 pwarn("Invalid long filename entry at end of directory %s\n",
 361                     path);
 362                 break;
 363         case 2:
 364                 pwarn("Invalid long filename entry for volume label\n");
 365                 break;
 366         }
 367         if (ask(0, "Remove")) {
 368                 if (startcl != curcl) {
 369                         if (delete(f, boot, fat,
 370                                    startcl, start - buffer,
 371                                    endcl, end - buffer,
 372                                    endcl == curcl) == FSFATAL)
 373                                 return FSFATAL;
 374                         start = buffer;
 375                 }
 376                 /* startcl is < CLUST_FIRST for !fat32 root */
 377                 if ((endcl == curcl) || (startcl < CLUST_FIRST))
 378                         for (; start < end; start += 32)
 379                                 *start = SLOT_DELETED;
 380                 return FSDIRMOD;
 381         }
 382         return FSERROR;
 383 }
 384
 385 /*
 386  * Check an in-memory file entry
 387  */
 388 static int
 389 checksize(struct bootblock *boot, struct fatEntry *fat, u_char *p,
 390     struct dosDirEntry *dir)
 391 {
 392         /*
 393          * Check size on ordinary files
 394          */
 395         u_int32_t physicalSize;
 396
 397         if (dir->head == CLUST_FREE)
 398                 physicalSize = 0;
 399         else {
 400                 if (dir->head < CLUST_FIRST || dir->head >= boot->NumClusters)
 401                         return FSERROR;
 402                 physicalSize = fat[dir->head].length * boot->ClusterSize;
 403         }
 404         if (physicalSize < dir->size) {
 405                 pwarn("size of %s is %u, should at most be %u\n",
 406                       fullpath(dir), dir->size, physicalSize);
 407                 if (ask(1, "Truncate")) {
 408                         dir->size = physicalSize;
 409                         p[28] = (u_char)physicalSize;
 410                         p[29] = (u_char)(physicalSize >> 8);
 411                         p[30] = (u_char)(physicalSize >> 16);
 412                         p[31] = (u_char)(physicalSize >> 24);
 413                         return FSDIRMOD;
 414                 } else
 415                         return FSERROR;
 416         } else if (physicalSize - dir->size >= boot->ClusterSize) {
 417                 pwarn("%s has too many clusters allocated\n",
 418                       fullpath(dir));
 419                 if (ask(1, "Drop superfluous clusters")) {
 420                         cl_t cl;
 421                         u_int32_t sz = 0;
 422
 423                         for (cl = dir->head; (sz += boot->ClusterSize) <
 424                             dir->size;)
 425                                 cl = fat[cl].next;
 426                         clearchain(boot, fat, fat[cl].next);
 427                         fat[cl].next = CLUST_EOF;
 428                         return FSFATMOD;
 429                 } else
 430                         return FSERROR;
 431         }
 432         return FSOK;
 433 }
 434
 435 /*
 436  * Read a directory and
 437  *   - resolve long name records
 438  *   - enter file and directory records into the parent's list
 439  *   - push directories onto the todo-stack
 440  */
 441 static int
 442 readDosDirSection(int f, struct bootblock *boot, struct fatEntry *fat,
 443     struct dosDirEntry *dir)
 444 {
 445         struct dosDirEntry dirent, *d;
 446         u_char *p, *vallfn, *invlfn, *empty;
 447         off_t off;
 448         int i, j, k, last;
 449         cl_t cl, valcl = ~0, invcl = ~0, empcl = ~0;
 450         char *t;
 451         u_int lidx = 0;
 452         int shortSum;
 453         int mod = FSOK;
 454 #define THISMOD 0x8000                  /* Only used within this routine */
 455
 456         cl = dir->head;
 457         if (dir->parent && (cl < CLUST_FIRST || cl >= boot->NumClusters)) {
 458                 /*
 459                  * Already handled somewhere else.
 460                  */
 461                 return FSOK;
 462         }
 463         shortSum = -1;
 464         vallfn = invlfn = empty = NULL;
 465         do {
 466                 if (!(boot->flags & FAT32) && !dir->parent) {
 467                         last = boot->bpbRootDirEnts * 32;
 468                         off = boot->bpbResSectors + boot->bpbFATs *
 469                             boot->FATsecs;
 470                 } else {
 471                         last = boot->bpbSecPerClust * boot->bpbBytesPerSec;
 472                         off = cl * boot->bpbSecPerClust + boot->ClusterOffset;
 473                 }
 474
 475                 off *= boot->bpbBytesPerSec;
 476                 if (lseek(f, off, SEEK_SET) != off
 477                     || read(f, buffer, last) != last) {
 478                         perror("Unable to read directory");
 479                         return FSFATAL;
 480                 }
 481                 last /= 32;
 482                 /*
 483                  * Check `.' and `..' entries here?                     XXX
 484                  */
 485                 for (p = buffer, i = 0; i < last; i++, p += 32) {
 486                         if (dir->fsckflags & DIREMPWARN) {
 487                                 *p = SLOT_EMPTY;
 488                                 continue;
 489                         }
 490
 491                         if (*p == SLOT_EMPTY || *p == SLOT_DELETED) {
 492                                 if (*p == SLOT_EMPTY) {
 493                                         dir->fsckflags |= DIREMPTY;
 494                                         empty = p;
 495                                         empcl = cl;
 496                                 }
 497                                 continue;
 498                         }
 499
 500                         if (dir->fsckflags & DIREMPTY) {
 501                                 if (!(dir->fsckflags & DIREMPWARN)) {
 502                                         pwarn("%s has entries after end of directory\n",
 503                                               fullpath(dir));
 504                                         if (ask(1, "Extend")) {
 505                                                 u_char *q;
 506
 507                                                 dir->fsckflags &= ~DIREMPTY;
 508                                                 if (delete(f, boot, fat,
 509                                                            empcl, empty - buffer,
 510                                                            cl, p - buffer, 1) == FSFATAL)
 511                                                         return FSFATAL;
 512                                                 q = empcl == cl ? empty : buffer;
 513                                                 for (; q < p; q += 32)
 514                                                         *q = SLOT_DELETED;
 515                                                 mod |= THISMOD|FSDIRMOD;
 516                                         } else if (ask(0, "Truncate"))
 517                                                 dir->fsckflags |= DIREMPWARN;
 518                                 }
 519                                 if (dir->fsckflags & DIREMPWARN) {
 520                                         *p = SLOT_DELETED;
 521                                         mod |= THISMOD|FSDIRMOD;
 522                                         continue;
 523                                 } else if (dir->fsckflags & DIREMPTY)
 524                                         mod |= FSERROR;
 525                                 empty = NULL;
 526                         }
 527
 528                         if (p[11] == ATTR_WIN95) {
 529                                 if (*p & LRFIRST) {
 530                                         if (shortSum != -1) {
 531                                                 if (!invlfn) {
 532                                                         invlfn = vallfn;
 533                                                         invcl = valcl;
 534                                                 }
 535                                         }
 536                                         memset(longName, 0, sizeof longName);
 537                                         shortSum = p[13];
 538                                         vallfn = p;
 539                                         valcl = cl;
 540                                 } else if (shortSum != p[13]
 541                                            || lidx != (*p & LRNOMASK)) {
 542                                         if (!invlfn) {
 543                                                 invlfn = vallfn;
 544                                                 invcl = valcl;
 545                                         }
 546                                         if (!invlfn) {
 547                                                 invlfn = p;
 548                                                 invcl = cl;
 549                                         }
 550                                         vallfn = NULL;
 551                                 }
 552                                 lidx = *p & LRNOMASK;
 553                                 t = longName + --lidx * 13;
 554                                 for (k = 1; k < 11 && t < longName +
 555                                     sizeof(longName); k += 2) {
 556                                         if (!p[k] && !p[k + 1])
 557                                                 break;
 558                                         *t++ = p[k];
 559                                         /*
 560                                          * Warn about those unusable chars in msdosfs here?     XXX
 561                                          */
 562                                         if (p[k + 1])
 563                                                 t[-1] = '?';
 564                                 }
 565                                 if (k >= 11)
 566                                         for (k = 14; k < 26 && t < longName + sizeof(longName); k += 2) {
 567                                                 if (!p[k] && !p[k + 1])
 568                                                         break;
 569                                                 *t++ = p[k];
 570                                                 if (p[k + 1])
 571                                                         t[-1] = '?';
 572                                         }
 573                                 if (k >= 26)
 574                                         for (k = 28; k < 32 && t < longName + sizeof(longName); k += 2) {
 575                                                 if (!p[k] && !p[k + 1])
 576                                                         break;
 577                                                 *t++ = p[k];
 578                                                 if (p[k + 1])
 579                                                         t[-1] = '?';
 580                                         }
 581                                 if (t >= longName + sizeof(longName)) {
 582                                         pwarn("long filename too long\n");
 583                                         if (!invlfn) {
 584                                                 invlfn = vallfn;
 585                                                 invcl = valcl;
 586                                         }
 587                                         vallfn = NULL;
 588                                 }
 589                                 if (p[26] | (p[27] << 8)) {
 590                                         pwarn("long filename record cluster start != 0\n");
 591                                         if (!invlfn) {
 592                                                 invlfn = vallfn;
 593                                                 invcl = cl;
 594                                         }
 595                                         vallfn = NULL;
 596                                 }
 597                                 continue;       /* long records don't carry further
 598                                                  * information */
 599                         }
 600
 601                         /*
 602                          * This is a standard msdosfs directory entry.
 603                          */
 604                         memset(&dirent, 0, sizeof dirent);
 605
 606                         /*
 607                          * it's a short name record, but we need to know
 608                          * more, so get the flags first.
 609                          */
 610                         dirent.flags = p[11];
 611
 612                         /*
 613                          * Translate from 850 to ISO here               XXX
 614                          */
 615                         for (j = 0; j < 8; j++)
 616                                 dirent.name[j] = p[j];
 617                         dirent.name[8] = '\0';
 618                         for (k = 7; k >= 0 && dirent.name[k] == ' '; k--)
 619                                 dirent.name[k] = '\0';
 620                         if (dirent.name[k] != '\0')
 621                                 k++;
 622                         if (dirent.name[0] == SLOT_E5)
 623                                 dirent.name[0] = 0xe5;
 624
 625                         if (dirent.flags & ATTR_VOLUME) {
 626                                 if (vallfn || invlfn) {
 627                                         mod |= removede(f, boot, fat,
 628                                                         invlfn ? invlfn : vallfn, p,
 629                                                         invlfn ? invcl : valcl, -1, 0,
 630                                                         fullpath(dir), 2);
 631                                         vallfn = NULL;
 632                                         invlfn = NULL;
 633                                 }
 634                                 continue;
 635                         }
 636
 637                         if (p[8] != ' ')
 638                                 dirent.name[k++] = '.';
 639                         for (j = 0; j < 3; j++)
 640                                 dirent.name[k++] = p[j+8];
 641                         dirent.name[k] = '\0';
 642                         for (k--; k >= 0 && dirent.name[k] == ' '; k--)
 643                                 dirent.name[k] = '\0';
 644
 645                         if (vallfn && shortSum != calcShortSum(p)) {
 646                                 if (!invlfn) {
 647                                         invlfn = vallfn;
 648                                         invcl = valcl;
 649                                 }
 650                                 vallfn = NULL;
 651                         }
 652                         dirent.head = p[26] | (p[27] << 8);
 653                         if (boot->ClustMask == CLUST32_MASK)
 654                                 dirent.head |= (p[20] << 16) | (p[21] << 24);
 655                         dirent.size = p[28] | (p[29] << 8) | (p[30] << 16) | (p[31] << 24);
 656                         if (vallfn) {
 657                                 strlcpy(dirent.lname, longName,
 658                                     sizeof(dirent.lname));
 659                                 longName[0] = '\0';
 660                                 shortSum = -1;
 661                         }
 662
 663                         dirent.parent = dir;
 664                         dirent.next = dir->child;
 665
 666                         if (invlfn) {
 667                                 mod |= k = removede(f, boot, fat,
 668                                                     invlfn, vallfn ? vallfn : p,
 669                                                     invcl, vallfn ? valcl : cl, cl,
 670                                                     fullpath(&dirent), 0);
 671                                 if (mod & FSFATAL)
 672                                         return FSFATAL;
 673                                 if (vallfn
 674                                     ? (valcl == cl && vallfn != buffer)
 675                                     : p != buffer)
 676                                         if (k & FSDIRMOD)
 677                                                 mod |= THISMOD;
 678                         }
 679
 680                         vallfn = NULL; /* not used any longer */
 681                         invlfn = NULL;
 682
 683                         if (dirent.size == 0 && !(dirent.flags & ATTR_DIRECTORY)) {
 684                                 if (dirent.head != 0) {
 685                                         pwarn("%s has clusters, but size 0\n",
 686                                               fullpath(&dirent));
 687                                         if (ask(1, "Drop allocated clusters")) {
 688                                                 p[26] = p[27] = 0;
 689                                                 if (boot->ClustMask == CLUST32_MASK)
 690                                                         p[20] = p[21] = 0;
 691                                                 clearchain(boot, fat, dirent.head);
 692                                                 dirent.head = 0;
 693                                                 mod |= THISMOD|FSDIRMOD|FSFATMOD;
 694                                         } else
 695                                                 mod |= FSERROR;
 696                                 }
 697                         } else if (dirent.head == 0
 698                                    && !strcmp(dirent.name, "..")
 699                                    && dir->parent                       /* XXX */
 700                                    && !dir->parent->parent) {
 701                                 /*
 702                                  *  Do nothing, the parent is the root
 703                                  */
 704                         } else if (dirent.head < CLUST_FIRST
 705                                    || dirent.head >= boot->NumClusters
 706                                    || fat[dirent.head].next == CLUST_FREE
 707                                    || (fat[dirent.head].next >= CLUST_RSRVD
 708                                        && fat[dirent.head].next < CLUST_EOFS)
 709                                    || fat[dirent.head].head != dirent.head) {
 710                                 if (dirent.head == 0)
 711                                         pwarn("%s has no clusters\n",
 712                                               fullpath(&dirent));
 713                                 else if (dirent.head < CLUST_FIRST
 714                                          || dirent.head >= boot->NumClusters)
 715                                         pwarn("%s starts with cluster out of range(%u)\n",
 716                                               fullpath(&dirent),
 717                                               dirent.head);
 718                                 else if (fat[dirent.head].next == CLUST_FREE)
 719                                         pwarn("%s starts with free cluster\n",
 720                                               fullpath(&dirent));
 721                                 else if (fat[dirent.head].next >= CLUST_RSRVD)
 722                                         pwarn("%s starts with cluster marked %s\n",
 723                                               fullpath(&dirent),
 724                                               rsrvdcltype(fat[dirent.head].next));
 725                                 else
 726                                         pwarn("%s doesn't start a cluster chain\n",
 727                                               fullpath(&dirent));
 728                                 if (dirent.flags & ATTR_DIRECTORY) {
 729                                         if (ask(0, "Remove")) {
 730                                                 *p = SLOT_DELETED;
 731                                                 mod |= THISMOD|FSDIRMOD;
 732                                         } else
 733                                                 mod |= FSERROR;
 734                                         continue;
 735                                 } else {
 736                                         if (ask(1, "Truncate")) {
 737                                                 p[28] = p[29] = p[30] = p[31] = 0;
 738                                                 p[26] = p[27] = 0;
 739                                                 if (boot->ClustMask == CLUST32_MASK)
 740                                                         p[20] = p[21] = 0;
 741                                                 dirent.size = 0;
 742                                                 mod |= THISMOD|FSDIRMOD;
 743                                         } else
 744                                                 mod |= FSERROR;
 745                                 }
 746                         }
 747
 748                         if (dirent.head >= CLUST_FIRST && dirent.head < boot->NumClusters)
 749                                 fat[dirent.head].flags |= FAT_USED;
 750
 751                         if (dirent.flags & ATTR_DIRECTORY) {
 752                                 /*
 753                                  * gather more info for directories
 754                                  */
 755                                 struct dirTodoNode *n;
 756
 757                                 if (dirent.size) {
 758                                         pwarn("Directory %s has size != 0\n",
 759                                               fullpath(&dirent));
 760                                         if (ask(1, "Correct")) {
 761                                                 p[28] = p[29] = p[30] = p[31] = 0;
 762                                                 dirent.size = 0;
 763                                                 mod |= THISMOD|FSDIRMOD;
 764                                         } else
 765                                                 mod |= FSERROR;
 766                                 }
 767                                 /*
 768                                  * handle `.' and `..' specially
 769                                  */
 770                                 if (strcmp(dirent.name, ".") == 0) {
 771                                         if (dirent.head != dir->head) {
 772                                                 pwarn("`.' entry in %s has incorrect start cluster\n",
 773                                                       fullpath(dir));
 774                                                 if (ask(1, "Correct")) {
 775                                                         dirent.head = dir->head;
 776                                                         p[26] = (u_char)dirent.head;
 777                                                         p[27] = (u_char)(dirent.head >> 8);
 778                                                         if (boot->ClustMask == CLUST32_MASK) {
 779                                                                 p[20] = (u_char)(dirent.head >> 16);
 780                                                                 p[21] = (u_char)(dirent.head >> 24);
 781                                                         }
 782                                                         mod |= THISMOD|FSDIRMOD;
 783                                                 } else
 784                                                         mod |= FSERROR;
 785                                         }
 786                                         continue;
 787                                 }
 788                                 if (strcmp(dirent.name, "..") == 0) {
 789                                         if (dir->parent) {              /* XXX */
 790                                                 if (!dir->parent->parent) {
 791                                                         if (dirent.head) {
 792                                                                 pwarn("`..' entry in %s has non-zero start cluster\n",
 793                                                                       fullpath(dir));
 794                                                                 if (ask(1, "Correct")) {
 795                                                                         dirent.head = 0;
 796                                                                         p[26] = p[27] = 0;
 797                                                                         if (boot->ClustMask == CLUST32_MASK)
 798                                                                                 p[20] = p[21] = 0;
 799                                                                         mod |= THISMOD|FSDIRMOD;
 800                                                                 } else
 801                                                                         mod |= FSERROR;
 802                                                         }
 803                                                 } else if (dirent.head != dir->parent->head) {
 804                                                         pwarn("`..' entry in %s has incorrect start cluster\n",
 805                                                               fullpath(dir));
 806                                                         if (ask(1, "Correct")) {
 807                                                                 dirent.head = dir->parent->head;
 808                                                                 p[26] = (u_char)dirent.head;
 809                                                                 p[27] = (u_char)(dirent.head >> 8);
 810                                                                 if (boot->ClustMask == CLUST32_MASK) {
 811                                                                         p[20] = (u_char)(dirent.head >> 16);
 812                                                                         p[21] = (u_char)(dirent.head >> 24);
 813                                                                 }
 814                                                                 mod |= THISMOD|FSDIRMOD;
 815                                                         } else
 816                                                                 mod |= FSERROR;
 817                                                 }
 818                                         }
 819                                         continue;
 820                                 }
 821
 822                                 /* create directory tree node */
 823                                 if (!(d = newDosDirEntry())) {
 824                                         perror("No space for directory");
 825                                         return FSFATAL;
 826                                 }
 827                                 memcpy(d, &dirent, sizeof(struct dosDirEntry));
 828                                 /* link it into the tree */
 829                                 dir->child = d;
 830
 831                                 /* Enter this directory into the todo list */
 832                                 if (!(n = newDirTodo())) {
 833                                         perror("No space for todo list");
 834                                         return FSFATAL;
 835                                 }
 836                                 n->next = pendingDirectories;
 837                                 n->dir = d;
 838                                 pendingDirectories = n;
 839                         } else {
 840                                 mod |= k = checksize(boot, fat, p, &dirent);
 841                                 if (k & FSDIRMOD)
 842                                         mod |= THISMOD;
 843                         }
 844                         boot->NumFiles++;
 845                 }
 846
 847                 if (!(boot->flags & FAT32) && !dir->parent)
 848                         break;
 849
 850                 if (mod & THISMOD) {
 851                         last *= 32;
 852                         if (lseek(f, off, SEEK_SET) != off
 853                             || write(f, buffer, last) != last) {
 854                                 perror("Unable to write directory");
 855                                 return FSFATAL;
 856                         }
 857                         mod &= ~THISMOD;
 858                 }
 859         } while ((cl = fat[cl].next) >= CLUST_FIRST && cl < boot->NumClusters);
 860         if (invlfn || vallfn)
 861                 mod |= removede(f, boot, fat,
 862                                 invlfn ? invlfn : vallfn, p,
 863                                 invlfn ? invcl : valcl, -1, 0,
 864                                 fullpath(dir), 1);
 865
 866         /* The root directory of non fat32 filesystems is in a special
 867          * area and may have been modified above without being written out.
 868          */
 869         if ((mod & FSDIRMOD) && !(boot->flags & FAT32) && !dir->parent) {
 870                 last *= 32;
 871                 if (lseek(f, off, SEEK_SET) != off
 872                     || write(f, buffer, last) != last) {
 873                         perror("Unable to write directory");
 874                         return FSFATAL;
 875                 }
 876                 mod &= ~THISMOD;
 877         }
 878         return mod & ~THISMOD;
 879 }
 880
 881 int
 882 handleDirTree(int dosfs, struct bootblock *boot, struct fatEntry *fat)
 883 {
 884         int mod;
 885
 886         mod = readDosDirSection(dosfs, boot, fat, rootDir);
 887         if (mod & FSFATAL)
 888                 return FSFATAL;
 889
 890         /*
 891          * process the directory todo list
 892          */
 893         while (pendingDirectories) {
 894                 struct dosDirEntry *dir = pendingDirectories->dir;
 895                 struct dirTodoNode *n = pendingDirectories->next;
 896
 897                 /*
 898                  * remove TODO entry now, the list might change during
 899                  * directory reads
 900                  */
 901                 freeDirTodo(pendingDirectories);
 902                 pendingDirectories = n;
 903
 904                 /*
 905                  * handle subdirectory
 906                  */
 907                 mod |= readDosDirSection(dosfs, boot, fat, dir);
 908                 if (mod & FSFATAL)
 909                         return FSFATAL;
 910         }
 911
 912         return mod;
 913 }
 914
 915 /*
 916  * Try to reconnect a FAT chain into dir
 917  */
 918 static u_char *lfbuf;
 919 static cl_t lfcl;
 920 static off_t lfoff;
 921
 922 int
 923 reconnect(int dosfs, struct bootblock *boot, struct fatEntry *fat, cl_t head)
 924 {
 925         struct dosDirEntry d;
 926         u_char *p;
 927
 928         if (!ask(1, "Reconnect"))
 929                 return FSERROR;
 930
 931         if (!lostDir) {
 932                 for (lostDir = rootDir->child; lostDir; lostDir = lostDir->next) {
 933                         if (!strcmp(lostDir->name, LOSTDIR))
 934                                 break;
 935                 }
 936                 if (!lostDir) {         /* Create LOSTDIR?              XXX */
 937                         pwarn("No %s directory\n", LOSTDIR);
 938                         return FSERROR;
 939                 }
 940         }
 941         if (!lfbuf) {
 942                 lfbuf = malloc(boot->ClusterSize);
 943                 if (!lfbuf) {
 944                         perror("No space for buffer");
 945                         return FSFATAL;
 946                 }
 947                 p = NULL;
 948         } else
 949                 p = lfbuf;
 950         while (1) {
 951                 if (p)
 952                         for (; p < lfbuf + boot->ClusterSize; p += 32)
 953                                 if (*p == SLOT_EMPTY
 954                                     || *p == SLOT_DELETED)
 955                                         break;
 956                 if (p && p < lfbuf + boot->ClusterSize)
 957                         break;
 958                 lfcl = p ? fat[lfcl].next : lostDir->head;
 959                 if (lfcl < CLUST_FIRST || lfcl >= boot->NumClusters) {
 960                         /* Extend LOSTDIR?                              XXX */
 961                         pwarn("No space in %s\n", LOSTDIR);
 962                         return FSERROR;
 963                 }
 964                 lfoff = lfcl * boot->ClusterSize
 965                     + boot->ClusterOffset * boot->bpbBytesPerSec;
 966                 if (lseek(dosfs, lfoff, SEEK_SET) != lfoff
 967                     || (size_t)read(dosfs, lfbuf, boot->ClusterSize) != boot->ClusterSize) {
 968                         perror("could not read LOST.DIR");
 969                         return FSFATAL;
 970                 }
 971                 p = lfbuf;
 972         }
 973
 974         boot->NumFiles++;
 975         /* Ensure uniqueness of entry here!                             XXX */
 976         memset(&d, 0, sizeof d);
 977         (void)snprintf(d.name, sizeof(d.name), "%u", head);
 978         d.flags = 0;
 979         d.head = head;
 980         d.size = fat[head].length * boot->ClusterSize;
 981
 982         memset(p, 0, 32);
 983         memset(p, ' ', 11);
 984         memcpy(p, d.name, strlen(d.name));
 985         p[26] = (u_char)d.head;
 986         p[27] = (u_char)(d.head >> 8);
 987         if (boot->ClustMask == CLUST32_MASK) {
 988                 p[20] = (u_char)(d.head >> 16);
 989                 p[21] = (u_char)(d.head >> 24);
 990         }
 991         p[28] = (u_char)d.size;
 992         p[29] = (u_char)(d.size >> 8);
 993         p[30] = (u_char)(d.size >> 16);
 994         p[31] = (u_char)(d.size >> 24);
 995         fat[head].flags |= FAT_USED;
 996         if (lseek(dosfs, lfoff, SEEK_SET) != lfoff
 997             || (size_t)write(dosfs, lfbuf, boot->ClusterSize) != boot->ClusterSize) {
 998                 perror("could not write LOST.DIR");
 999                 return FSFATAL;
1000         }
1001         return FSDIRMOD;
1002 }
1003
1004 void
1005 finishlf(void)
1006 {
1007         if (lfbuf)
1008                 free(lfbuf);
1009         lfbuf = NULL;
1010 }