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 || boot->bpbRootClust >= boot->NumClusters) {
 246                         pfatal("Root directory starts with cluster out of range(%u)",
 247                                boot->bpbRootClust);
 248                         return FSFATAL;
 249                 }
 250                 cl = fat[boot->bpbRootClust].next;
 251                 if (cl < CLUST_FIRST
 252                     || (cl >= CLUST_RSRVD && cl< CLUST_EOFS)
 253                     || fat[boot->bpbRootClust].head != boot->bpbRootClust) {
 254                         if (cl == CLUST_FREE)
 255                                 pwarn("Root directory starts with free cluster\n");
 256                         else if (cl >= CLUST_RSRVD)
 257                                 pwarn("Root directory starts with cluster marked %s\n",
 258                                       rsrvdcltype(cl));
 259                         else {
 260                                 pfatal("Root directory doesn't start a cluster chain");
 261                                 return FSFATAL;
 262                         }
 263                         if (ask(1, "Fix")) {
 264                                 fat[boot->bpbRootClust].next = CLUST_FREE;
 265                                 ret = FSFATMOD;
 266                         } else
 267                                 ret = FSFATAL;
 268                 }
 269
 270                 fat[boot->bpbRootClust].flags |= FAT_USED;
 271                 rootDir->head = boot->bpbRootClust;
 272         }
 273
 274         return ret;
 275 }
 276
 277 /*
 278  * Cleanup after a directory scan
 279  */
 280 void
 281 finishDosDirSection(void)
 282 {
 283         struct dirTodoNode *p, *np;
 284         struct dosDirEntry *d, *nd;
 285
 286         for (p = pendingDirectories; p; p = np) {
 287                 np = p->next;
 288                 freeDirTodo(p);
 289         }
 290         pendingDirectories = 0;
 291         for (d = rootDir; d; d = nd) {
 292                 if ((nd = d->child) != NULL) {
 293                         d->child = 0;
 294                         continue;
 295                 }
 296                 if (!(nd = d->next))
 297                         nd = d->parent;
 298                 freeDosDirEntry(d);
 299         }
 300         rootDir = lostDir = NULL;
 301         free(buffer);
 302         free(delbuf);
 303         buffer = NULL;
 304         delbuf = NULL;
 305 }
 306
 307 /*
 308  * Delete directory entries between startcl, startoff and endcl, endoff.
 309  */
 310 static int
 311 delete(int f, struct bootblock *boot, struct fatEntry *fat, cl_t startcl,
 312     int startoff, cl_t endcl, int endoff, int notlast)
 313 {
 314         u_char *s, *e;
 315         off_t off;
 316         int clsz = boot->bpbSecPerClust * boot->bpbBytesPerSec;
 317
 318         s = delbuf + startoff;
 319         e = delbuf + clsz;
 320         while (startcl >= CLUST_FIRST && startcl < boot->NumClusters) {
 321                 if (startcl == endcl) {
 322                         if (notlast)
 323                                 break;
 324                         e = delbuf + endoff;
 325                 }
 326                 off = startcl * boot->bpbSecPerClust + boot->ClusterOffset;
 327                 off *= boot->bpbBytesPerSec;
 328                 if (lseek(f, off, SEEK_SET) != off
 329                     || read(f, delbuf, clsz) != clsz) {
 330                         perror("Unable to read directory");
 331                         return FSFATAL;
 332                 }
 333                 while (s < e) {
 334                         *s = SLOT_DELETED;
 335                         s += 32;
 336                 }
 337                 if (lseek(f, off, SEEK_SET) != off
 338                     || write(f, delbuf, clsz) != clsz) {
 339                         perror("Unable to write directory");
 340                         return FSFATAL;
 341                 }
 342                 if (startcl == endcl)
 343                         break;
 344                 startcl = fat[startcl].next;
 345                 s = delbuf;
 346         }
 347         return FSOK;
 348 }
 349
 350 static int
 351 removede(int f, struct bootblock *boot, struct fatEntry *fat, u_char *start,
 352     u_char *end, cl_t startcl, cl_t endcl, cl_t curcl, char *path, int type)
 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", path);
 360                 break;
 361         case 2:
 362                 pwarn("Invalid long filename entry for volume label\n");
 363                 break;
 364         }
 365         if (ask(0, "Remove")) {
 366                 if (startcl != curcl) {
 367                         if (delete(f, boot, fat,
 368                                    startcl, start - buffer,
 369                                    endcl, end - buffer,
 370                                    endcl == curcl) == FSFATAL)
 371                                 return FSFATAL;
 372                         start = buffer;
 373                 }
 374                 /* startcl is < CLUST_FIRST for !fat32 root */
 375                 if ((endcl == curcl) || (startcl < CLUST_FIRST))
 376                         for (; start < end; start += 32)
 377                                 *start = SLOT_DELETED;
 378                 return FSDIRMOD;
 379         }
 380         return FSERROR;
 381 }
 382
 383 /*
 384  * Check an in-memory file entry
 385  */
 386 static int
 387 checksize(struct bootblock *boot, struct fatEntry *fat, u_char *p,
 388     struct dosDirEntry *dir)
 389 {
 390         /*
 391          * Check size on ordinary files
 392          */
 393         u_int32_t physicalSize;
 394
 395         if (dir->head == CLUST_FREE)
 396                 physicalSize = 0;
 397         else {
 398                 if (dir->head < CLUST_FIRST || dir->head >= boot->NumClusters)
 399                         return FSERROR;
 400                 physicalSize = fat[dir->head].length * boot->ClusterSize;
 401         }
 402         if (physicalSize < dir->size) {
 403                 pwarn("size of %s is %u, should at most be %u\n",
 404                       fullpath(dir), dir->size, physicalSize);
 405                 if (ask(1, "Truncate")) {
 406                         dir->size = physicalSize;
 407                         p[28] = (u_char)physicalSize;
 408                         p[29] = (u_char)(physicalSize >> 8);
 409                         p[30] = (u_char)(physicalSize >> 16);
 410                         p[31] = (u_char)(physicalSize >> 24);
 411                         return FSDIRMOD;
 412                 } else
 413                         return FSERROR;
 414         } else if (physicalSize - dir->size >= boot->ClusterSize) {
 415                 pwarn("%s has too many clusters allocated\n",
 416                       fullpath(dir));
 417                 if (ask(1, "Drop superfluous clusters")) {
 418                         cl_t cl;
 419                         u_int32_t sz = 0;
 420
 421                         for (cl = dir->head; (sz += boot->ClusterSize) < dir->size;)
 422                                 cl = fat[cl].next;
 423                         clearchain(boot, fat, fat[cl].next);
 424                         fat[cl].next = CLUST_EOF;
 425                         return FSFATMOD;
 426                 } else
 427                         return FSERROR;
 428         }
 429         return FSOK;
 430 }
 431
 432 /*
 433  * Read a directory and
 434  *   - resolve long name records
 435  *   - enter file and directory records into the parent's list
 436  *   - push directories onto the todo-stack
 437  */
 438 static int
 439 readDosDirSection(int f, struct bootblock *boot, struct fatEntry *fat,
 440     struct dosDirEntry *dir)
 441 {
 442         struct dosDirEntry dirent, *d;
 443         u_char *p, *vallfn, *invlfn, *empty;
 444         off_t off;
 445         int i, j, k, last;
 446         cl_t cl, valcl = ~0, invcl = ~0, empcl = ~0;
 447         char *t;
 448         u_int lidx = 0;
 449         int shortSum;
 450         int mod = FSOK;
 451 #define THISMOD 0x8000                  /* Only used within this routine */
 452
 453         cl = dir->head;
 454         if (dir->parent && (cl < CLUST_FIRST || cl >= boot->NumClusters)) {
 455                 /*
 456                  * Already handled somewhere else.
 457                  */
 458                 return FSOK;
 459         }
 460         shortSum = -1;
 461         vallfn = invlfn = empty = NULL;
 462         do {
 463                 if (!(boot->flags & FAT32) && !dir->parent) {
 464                         last = boot->bpbRootDirEnts * 32;
 465                         off = boot->bpbResSectors + boot->bpbFATs * boot->FATsecs;
 466                 } else {
 467                         last = boot->bpbSecPerClust * boot->bpbBytesPerSec;
 468                         off = cl * boot->bpbSecPerClust + boot->ClusterOffset;
 469                 }
 470
 471                 off *= boot->bpbBytesPerSec;
 472                 if (lseek(f, off, SEEK_SET) != off
 473                     || read(f, buffer, last) != last) {
 474                         perror("Unable to read directory");
 475                         return FSFATAL;
 476                 }
 477                 last /= 32;
 478                 /*
 479                  * Check `.' and `..' entries here?                     XXX
 480                  */
 481                 for (p = buffer, i = 0; i < last; i++, p += 32) {
 482                         if (dir->fsckflags & DIREMPWARN) {
 483                                 *p = SLOT_EMPTY;
 484                                 continue;
 485                         }
 486
 487                         if (*p == SLOT_EMPTY || *p == SLOT_DELETED) {
 488                                 if (*p == SLOT_EMPTY) {
 489                                         dir->fsckflags |= DIREMPTY;
 490                                         empty = p;
 491                                         empcl = cl;
 492                                 }
 493                                 continue;
 494                         }
 495
 496                         if (dir->fsckflags & DIREMPTY) {
 497                                 if (!(dir->fsckflags & DIREMPWARN)) {
 498                                         pwarn("%s has entries after end of directory\n",
 499                                               fullpath(dir));
 500                                         if (ask(1, "Extend")) {
 501                                                 u_char *q;
 502
 503                                                 dir->fsckflags &= ~DIREMPTY;
 504                                                 if (delete(f, boot, fat,
 505                                                            empcl, empty - buffer,
 506                                                            cl, p - buffer, 1) == FSFATAL)
 507                                                         return FSFATAL;
 508                                                 q = empcl == cl ? empty : buffer;
 509                                                 for (; q < p; q += 32)
 510                                                         *q = SLOT_DELETED;
 511                                                 mod |= THISMOD|FSDIRMOD;
 512                                         } else if (ask(0, "Truncate"))
 513                                                 dir->fsckflags |= DIREMPWARN;
 514                                 }
 515                                 if (dir->fsckflags & DIREMPWARN) {
 516                                         *p = SLOT_DELETED;
 517                                         mod |= THISMOD|FSDIRMOD;
 518                                         continue;
 519                                 } else if (dir->fsckflags & DIREMPTY)
 520                                         mod |= FSERROR;
 521                                 empty = NULL;
 522                         }
 523
 524                         if (p[11] == ATTR_WIN95) {
 525                                 if (*p & LRFIRST) {
 526                                         if (shortSum != -1) {
 527                                                 if (!invlfn) {
 528                                                         invlfn = vallfn;
 529                                                         invcl = valcl;
 530                                                 }
 531                                         }
 532                                         memset(longName, 0, sizeof longName);
 533                                         shortSum = p[13];
 534                                         vallfn = p;
 535                                         valcl = cl;
 536                                 } else if (shortSum != p[13]
 537                                            || lidx != (*p & LRNOMASK)) {
 538                                         if (!invlfn) {
 539                                                 invlfn = vallfn;
 540                                                 invcl = valcl;
 541                                         }
 542                                         if (!invlfn) {
 543                                                 invlfn = p;
 544                                                 invcl = cl;
 545                                         }
 546                                         vallfn = NULL;
 547                                 }
 548                                 lidx = *p & LRNOMASK;
 549                                 t = longName + --lidx * 13;
 550                                 for (k = 1; k < 11 && t < longName + sizeof(longName); k += 2) {
 551                                         if (!p[k] && !p[k + 1])
 552                                                 break;
 553                                         *t++ = p[k];
 554                                         /*
 555                                          * Warn about those unusable chars in msdosfs here?     XXX
 556                                          */
 557                                         if (p[k + 1])
 558                                                 t[-1] = '?';
 559                                 }
 560                                 if (k >= 11)
 561                                         for (k = 14; k < 26 && t < longName + sizeof(longName); k += 2) {
 562                                                 if (!p[k] && !p[k + 1])
 563                                                         break;
 564                                                 *t++ = p[k];
 565                                                 if (p[k + 1])
 566                                                         t[-1] = '?';
 567                                         }
 568                                 if (k >= 26)
 569                                         for (k = 28; k < 32 && t < longName + sizeof(longName); k += 2) {
 570                                                 if (!p[k] && !p[k + 1])
 571                                                         break;
 572                                                 *t++ = p[k];
 573                                                 if (p[k + 1])
 574                                                         t[-1] = '?';
 575                                         }
 576                                 if (t >= longName + sizeof(longName)) {
 577                                         pwarn("long filename too long\n");
 578                                         if (!invlfn) {
 579                                                 invlfn = vallfn;
 580                                                 invcl = valcl;
 581                                         }
 582                                         vallfn = NULL;
 583                                 }
 584                                 if (p[26] | (p[27] << 8)) {
 585                                         pwarn("long filename record cluster start != 0\n");
 586                                         if (!invlfn) {
 587                                                 invlfn = vallfn;
 588                                                 invcl = cl;
 589                                         }
 590                                         vallfn = NULL;
 591                                 }
 592                                 continue;       /* long records don't carry further
 593                                                  * information */
 594                         }
 595
 596                         /*
 597                          * This is a standard msdosfs directory entry.
 598                          */
 599                         memset(&dirent, 0, sizeof dirent);
 600
 601                         /*
 602                          * it's a short name record, but we need to know
 603                          * more, so get the flags first.
 604                          */
 605                         dirent.flags = p[11];
 606
 607                         /*
 608                          * Translate from 850 to ISO here               XXX
 609                          */
 610                         for (j = 0; j < 8; j++)
 611                                 dirent.name[j] = p[j];
 612                         dirent.name[8] = '\0';
 613                         for (k = 7; k >= 0 && dirent.name[k] == ' '; k--)
 614                                 dirent.name[k] = '\0';
 615                         if (dirent.name[k] != '\0')
 616                                 k++;
 617                         if (dirent.name[0] == SLOT_E5)
 618                                 dirent.name[0] = 0xe5;
 619
 620                         if (dirent.flags & ATTR_VOLUME) {
 621                                 if (vallfn || invlfn) {
 622                                         mod |= removede(f, boot, fat,
 623                                                         invlfn ? invlfn : vallfn, p,
 624                                                         invlfn ? invcl : valcl, -1, 0,
 625                                                         fullpath(dir), 2);
 626                                         vallfn = NULL;
 627                                         invlfn = NULL;
 628                                 }
 629                                 continue;
 630                         }
 631
 632                         if (p[8] != ' ')
 633                                 dirent.name[k++] = '.';
 634                         for (j = 0; j < 3; j++)
 635                                 dirent.name[k++] = p[j+8];
 636                         dirent.name[k] = '\0';
 637                         for (k--; k >= 0 && dirent.name[k] == ' '; k--)
 638                                 dirent.name[k] = '\0';
 639
 640                         if (vallfn && shortSum != calcShortSum(p)) {
 641                                 if (!invlfn) {
 642                                         invlfn = vallfn;
 643                                         invcl = valcl;
 644                                 }
 645                                 vallfn = NULL;
 646                         }
 647                         dirent.head = p[26] | (p[27] << 8);
 648                         if (boot->ClustMask == CLUST32_MASK)
 649                                 dirent.head |= (p[20] << 16) | (p[21] << 24);
 650                         dirent.size = p[28] | (p[29] << 8) | (p[30] << 16) | (p[31] << 24);
 651                         if (vallfn) {
 652                                 strlcpy(dirent.lname, longName,
 653                                     sizeof(dirent.lname));
 654                                 longName[0] = '\0';
 655                                 shortSum = -1;
 656                         }
 657
 658                         dirent.parent = dir;
 659                         dirent.next = dir->child;
 660
 661                         if (invlfn) {
 662                                 mod |= k = removede(f, boot, fat,
 663                                                     invlfn, vallfn ? vallfn : p,
 664                                                     invcl, vallfn ? valcl : cl, cl,
 665                                                     fullpath(&dirent), 0);
 666                                 if (mod & FSFATAL)
 667                                         return FSFATAL;
 668                                 if (vallfn
 669                                     ? (valcl == cl && vallfn != buffer)
 670                                     : p != buffer)
 671                                         if (k & FSDIRMOD)
 672                                                 mod |= THISMOD;
 673                         }
 674
 675                         vallfn = NULL; /* not used any longer */
 676                         invlfn = NULL;
 677
 678                         if (dirent.size == 0 && !(dirent.flags & ATTR_DIRECTORY)) {
 679                                 if (dirent.head != 0) {
 680                                         pwarn("%s has clusters, but size 0\n",
 681                                               fullpath(&dirent));
 682                                         if (ask(1, "Drop allocated clusters")) {
 683                                                 p[26] = p[27] = 0;
 684                                                 if (boot->ClustMask == CLUST32_MASK)
 685                                                         p[20] = p[21] = 0;
 686                                                 clearchain(boot, fat, dirent.head);
 687                                                 dirent.head = 0;
 688                                                 mod |= THISMOD|FSDIRMOD|FSFATMOD;
 689                                         } else
 690                                                 mod |= FSERROR;
 691                                 }
 692                         } else if (dirent.head == 0
 693                                    && !strcmp(dirent.name, "..")
 694                                    && dir->parent                       /* XXX */
 695                                    && !dir->parent->parent) {
 696                                 /*
 697                                  *  Do nothing, the parent is the root
 698                                  */
 699                         } else if (dirent.head < CLUST_FIRST
 700                                    || dirent.head >= boot->NumClusters
 701                                    || fat[dirent.head].next == CLUST_FREE
 702                                    || (fat[dirent.head].next >= CLUST_RSRVD
 703                                        && fat[dirent.head].next < CLUST_EOFS)
 704                                    || fat[dirent.head].head != dirent.head) {
 705                                 if (dirent.head == 0)
 706                                         pwarn("%s has no clusters\n",
 707                                               fullpath(&dirent));
 708                                 else if (dirent.head < CLUST_FIRST
 709                                          || dirent.head >= boot->NumClusters)
 710                                         pwarn("%s starts with cluster out of range(%u)\n",
 711                                               fullpath(&dirent),
 712                                               dirent.head);
 713                                 else if (fat[dirent.head].next == CLUST_FREE)
 714                                         pwarn("%s starts with free cluster\n",
 715                                               fullpath(&dirent));
 716                                 else if (fat[dirent.head].next >= CLUST_RSRVD)
 717                                         pwarn("%s starts with cluster marked %s\n",
 718                                               fullpath(&dirent),
 719                                               rsrvdcltype(fat[dirent.head].next));
 720                                 else
 721                                         pwarn("%s doesn't start a cluster chain\n",
 722                                               fullpath(&dirent));
 723                                 if (dirent.flags & ATTR_DIRECTORY) {
 724                                         if (ask(0, "Remove")) {
 725                                                 *p = SLOT_DELETED;
 726                                                 mod |= THISMOD|FSDIRMOD;
 727                                         } else
 728                                                 mod |= FSERROR;
 729                                         continue;
 730                                 } else {
 731                                         if (ask(1, "Truncate")) {
 732                                                 p[28] = p[29] = p[30] = p[31] = 0;
 733                                                 p[26] = p[27] = 0;
 734                                                 if (boot->ClustMask == CLUST32_MASK)
 735                                                         p[20] = p[21] = 0;
 736                                                 dirent.size = 0;
 737                                                 mod |= THISMOD|FSDIRMOD;
 738                                         } else
 739                                                 mod |= FSERROR;
 740                                 }
 741                         }
 742
 743                         if (dirent.head >= CLUST_FIRST && dirent.head < boot->NumClusters)
 744                                 fat[dirent.head].flags |= FAT_USED;
 745
 746                         if (dirent.flags & ATTR_DIRECTORY) {
 747                                 /*
 748                                  * gather more info for directories
 749                                  */
 750                                 struct dirTodoNode *n;
 751
 752                                 if (dirent.size) {
 753                                         pwarn("Directory %s has size != 0\n",
 754                                               fullpath(&dirent));
 755                                         if (ask(1, "Correct")) {
 756                                                 p[28] = p[29] = p[30] = p[31] = 0;
 757                                                 dirent.size = 0;
 758                                                 mod |= THISMOD|FSDIRMOD;
 759                                         } else
 760                                                 mod |= FSERROR;
 761                                 }
 762                                 /*
 763                                  * handle `.' and `..' specially
 764                                  */
 765                                 if (strcmp(dirent.name, ".") == 0) {
 766                                         if (dirent.head != dir->head) {
 767                                                 pwarn("`.' entry in %s has incorrect start cluster\n",
 768                                                       fullpath(dir));
 769                                                 if (ask(1, "Correct")) {
 770                                                         dirent.head = dir->head;
 771                                                         p[26] = (u_char)dirent.head;
 772                                                         p[27] = (u_char)(dirent.head >> 8);
 773                                                         if (boot->ClustMask == CLUST32_MASK) {
 774                                                                 p[20] = (u_char)(dirent.head >> 16);
 775                                                                 p[21] = (u_char)(dirent.head >> 24);
 776                                                         }
 777                                                         mod |= THISMOD|FSDIRMOD;
 778                                                 } else
 779                                                         mod |= FSERROR;
 780                                         }
 781                                         continue;
 782                                 }
 783                                 if (strcmp(dirent.name, "..") == 0) {
 784                                         if (dir->parent) {              /* XXX */
 785                                                 if (!dir->parent->parent) {
 786                                                         if (dirent.head) {
 787                                                                 pwarn("`..' entry in %s has non-zero start cluster\n",
 788                                                                       fullpath(dir));
 789                                                                 if (ask(1, "Correct")) {
 790                                                                         dirent.head = 0;
 791                                                                         p[26] = p[27] = 0;
 792                                                                         if (boot->ClustMask == CLUST32_MASK)
 793                                                                                 p[20] = p[21] = 0;
 794                                                                         mod |= THISMOD|FSDIRMOD;
 795                                                                 } else
 796                                                                         mod |= FSERROR;
 797                                                         }
 798                                                 } else if (dirent.head != dir->parent->head) {
 799                                                         pwarn("`..' entry in %s has incorrect start cluster\n",
 800                                                               fullpath(dir));
 801                                                         if (ask(1, "Correct")) {
 802                                                                 dirent.head = dir->parent->head;
 803                                                                 p[26] = (u_char)dirent.head;
 804                                                                 p[27] = (u_char)(dirent.head >> 8);
 805                                                                 if (boot->ClustMask == CLUST32_MASK) {
 806                                                                         p[20] = (u_char)(dirent.head >> 16);
 807                                                                         p[21] = (u_char)(dirent.head >> 24);
 808                                                                 }
 809                                                                 mod |= THISMOD|FSDIRMOD;
 810                                                         } else
 811                                                                 mod |= FSERROR;
 812                                                 }
 813                                         }
 814                                         continue;
 815                                 }
 816
 817                                 /* create directory tree node */
 818                                 if (!(d = newDosDirEntry())) {
 819                                         perror("No space for directory");
 820                                         return FSFATAL;
 821                                 }
 822                                 memcpy(d, &dirent, sizeof(struct dosDirEntry));
 823                                 /* link it into the tree */
 824                                 dir->child = d;
 825
 826                                 /* Enter this directory into the todo list */
 827                                 if (!(n = newDirTodo())) {
 828                                         perror("No space for todo list");
 829                                         return FSFATAL;
 830                                 }
 831                                 n->next = pendingDirectories;
 832                                 n->dir = d;
 833                                 pendingDirectories = n;
 834                         } else {
 835                                 mod |= k = checksize(boot, fat, p, &dirent);
 836                                 if (k & FSDIRMOD)
 837                                         mod |= THISMOD;
 838                         }
 839                         boot->NumFiles++;
 840                 }
 841
 842                 if (!(boot->flags & FAT32) && !dir->parent)
 843                         break;
 844
 845                 if (mod & THISMOD) {
 846                         last *= 32;
 847                         if (lseek(f, off, SEEK_SET) != off
 848                             || write(f, buffer, last) != last) {
 849                                 perror("Unable to write directory");
 850                                 return FSFATAL;
 851                         }
 852                         mod &= ~THISMOD;
 853                 }
 854         } while ((cl = fat[cl].next) >= CLUST_FIRST && cl < boot->NumClusters);
 855         if (invlfn || vallfn)
 856                 mod |= removede(f, boot, fat,
 857                                 invlfn ? invlfn : vallfn, p,
 858                                 invlfn ? invcl : valcl, -1, 0,
 859                                 fullpath(dir), 1);
 860
 861         /* The root directory of non fat32 filesystems is in a special
 862          * area and may have been modified above without being written out.
 863          */
 864         if ((mod & FSDIRMOD) && !(boot->flags & FAT32) && !dir->parent) {
 865                 last *= 32;
 866                 if (lseek(f, off, SEEK_SET) != off
 867                     || write(f, buffer, last) != last) {
 868                         perror("Unable to write directory");
 869                         return FSFATAL;
 870                 }
 871                 mod &= ~THISMOD;
 872         }
 873         return mod & ~THISMOD;
 874 }
 875
 876 int
 877 handleDirTree(int dosfs, struct bootblock *boot, struct fatEntry *fat)
 878 {
 879         int mod;
 880
 881         mod = readDosDirSection(dosfs, boot, fat, rootDir);
 882         if (mod & FSFATAL)
 883                 return FSFATAL;
 884
 885         /*
 886          * process the directory todo list
 887          */
 888         while (pendingDirectories) {
 889                 struct dosDirEntry *dir = pendingDirectories->dir;
 890                 struct dirTodoNode *n = pendingDirectories->next;
 891
 892                 /*
 893                  * remove TODO entry now, the list might change during
 894                  * directory reads
 895                  */
 896                 freeDirTodo(pendingDirectories);
 897                 pendingDirectories = n;
 898
 899                 /*
 900                  * handle subdirectory
 901                  */
 902                 mod |= readDosDirSection(dosfs, boot, fat, dir);
 903                 if (mod & FSFATAL)
 904                         return FSFATAL;
 905         }
 906
 907         return mod;
 908 }
 909
 910 /*
 911  * Try to reconnect a FAT chain into dir
 912  */
 913 static u_char *lfbuf;
 914 static cl_t lfcl;
 915 static off_t lfoff;
 916
 917 int
 918 reconnect(int dosfs, struct bootblock *boot, struct fatEntry *fat, cl_t head)
 919 {
 920         struct dosDirEntry d;
 921         u_char *p;
 922
 923         if (!ask(1, "Reconnect"))
 924                 return FSERROR;
 925
 926         if (!lostDir) {
 927                 for (lostDir = rootDir->child; lostDir; lostDir = lostDir->next) {
 928                         if (!strcmp(lostDir->name, LOSTDIR))
 929                                 break;
 930                 }
 931                 if (!lostDir) {         /* Create LOSTDIR?              XXX */
 932                         pwarn("No %s directory\n", LOSTDIR);
 933                         return FSERROR;
 934                 }
 935         }
 936         if (!lfbuf) {
 937                 lfbuf = malloc(boot->ClusterSize);
 938                 if (!lfbuf) {
 939                         perror("No space for buffer");
 940                         return FSFATAL;
 941                 }
 942                 p = NULL;
 943         } else
 944                 p = lfbuf;
 945         while (1) {
 946                 if (p)
 947                         for (; p < lfbuf + boot->ClusterSize; p += 32)
 948                                 if (*p == SLOT_EMPTY
 949                                     || *p == SLOT_DELETED)
 950                                         break;
 951                 if (p && p < lfbuf + boot->ClusterSize)
 952                         break;
 953                 lfcl = p ? fat[lfcl].next : lostDir->head;
 954                 if (lfcl < CLUST_FIRST || lfcl >= boot->NumClusters) {
 955                         /* Extend LOSTDIR?                              XXX */
 956                         pwarn("No space in %s\n", LOSTDIR);
 957                         return FSERROR;
 958                 }
 959                 lfoff = lfcl * boot->ClusterSize
 960                     + boot->ClusterOffset * boot->bpbBytesPerSec;
 961                 if (lseek(dosfs, lfoff, SEEK_SET) != lfoff
 962                     || (size_t)read(dosfs, lfbuf, boot->ClusterSize) != boot->ClusterSize) {
 963                         perror("could not read LOST.DIR");
 964                         return FSFATAL;
 965                 }
 966                 p = lfbuf;
 967         }
 968
 969         boot->NumFiles++;
 970         /* Ensure uniqueness of entry here!                             XXX */
 971         memset(&d, 0, sizeof d);
 972         (void)snprintf(d.name, sizeof(d.name), "%u", head);
 973         d.flags = 0;
 974         d.head = head;
 975         d.size = fat[head].length * boot->ClusterSize;
 976
 977         memset(p, 0, 32);
 978         memset(p, ' ', 11);
 979         memcpy(p, d.name, strlen(d.name));
 980         p[26] = (u_char)d.head;
 981         p[27] = (u_char)(d.head >> 8);
 982         if (boot->ClustMask == CLUST32_MASK) {
 983                 p[20] = (u_char)(d.head >> 16);
 984                 p[21] = (u_char)(d.head >> 24);
 985         }
 986         p[28] = (u_char)d.size;
 987         p[29] = (u_char)(d.size >> 8);
 988         p[30] = (u_char)(d.size >> 16);
 989         p[31] = (u_char)(d.size >> 24);
 990         fat[head].flags |= FAT_USED;
 991         if (lseek(dosfs, lfoff, SEEK_SET) != lfoff
 992             || (size_t)write(dosfs, lfbuf, boot->ClusterSize) != boot->ClusterSize) {
 993                 perror("could not write LOST.DIR");
 994                 return FSFATAL;
 995         }
 996         return FSDIRMOD;
 997 }
 998
 999 void
1000 finishlf(void)
1001 {
1002         if (lfbuf)
1003                 free(lfbuf);
1004         lfbuf = NULL;
1005 }