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  * 3. All advertising materials mentioning features or use of this software
  16  *    must display the following acknowledgement:
  17  *      This product includes software developed by Martin Husemann
  18  *      and Wolfgang Solfrank.
  19  * 4. Neither the name of the University nor the names of its contributors
  20  *    may be used to endorse or promote products derived from this software
  21  *    without specific prior written permission.
  22  *
  23  * THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS OR
  24  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  25  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  26  * IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY DIRECT, INDIRECT,
  27  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  28  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  29  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  30  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  31  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  32  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  33  *
  34  * $NetBSD: dir.c,v 1.14 1998/08/25 19:18:15 ross Exp $
  35  * $FreeBSD: src/sbin/fsck_msdosfs/dir.c,v 1.1.2.1 2001/08/01 05:47:55 obrien Exp $
  36  */
  37
  38 #include <stdio.h>
  39 #include <stdlib.h>
  40 #include <string.h>
  41 #include <ctype.h>
  42 #include <unistd.h>
  43 #include <time.h>
  44
  45 #include <sys/param.h>
  46
  47 #include "ext.h"
  48 #include "fsutil.h"
  49
  50 #define SLOT_EMPTY      0x00            /* slot has never been used */
  51 #define SLOT_E5         0x05            /* the real value is 0xe5 */
  52 #define SLOT_DELETED    0xe5            /* file in this slot deleted */
  53
  54 #define ATTR_NORMAL     0x00            /* normal file */
  55 #define ATTR_READONLY   0x01            /* file is readonly */
  56 #define ATTR_HIDDEN     0x02            /* file is hidden */
  57 #define ATTR_SYSTEM     0x04            /* file is a system file */
  58 #define ATTR_VOLUME     0x08            /* entry is a volume label */
  59 #define ATTR_DIRECTORY  0x10            /* entry is a directory name */
  60 #define ATTR_ARCHIVE    0x20            /* file is new or modified */
  61
  62 #define ATTR_WIN95      0x0f            /* long name record */
  63
  64 /*
  65  * This is the format of the contents of the deTime field in the direntry
  66  * structure.
  67  * We don't use bitfields because we don't know how compilers for
  68  * arbitrary machines will lay them out.
  69  */
  70 #define DT_2SECONDS_MASK        0x1F    /* seconds divided by 2 */
  71 #define DT_2SECONDS_SHIFT       0
  72 #define DT_MINUTES_MASK         0x7E0   /* minutes */
  73 #define DT_MINUTES_SHIFT        5
  74 #define DT_HOURS_MASK           0xF800  /* hours */
  75 #define DT_HOURS_SHIFT          11
  76
  77 /*
  78  * This is the format of the contents of the deDate field in the direntry
  79  * structure.
  80  */
  81 #define DD_DAY_MASK             0x1F    /* day of month */
  82 #define DD_DAY_SHIFT            0
  83 #define DD_MONTH_MASK           0x1E0   /* month */
  84 #define DD_MONTH_SHIFT          5
  85 #define DD_YEAR_MASK            0xFE00  /* year - 1980 */
  86 #define DD_YEAR_SHIFT           9
  87
  88
  89 /* dir.c */
  90 static struct dosDirEntry *newDosDirEntry(void);
  91 static void freeDosDirEntry(struct dosDirEntry *);
  92 static struct dirTodoNode *newDirTodo(void);
  93 static void freeDirTodo(struct dirTodoNode *);
  94 static char *fullpath(struct dosDirEntry *);
  95 static u_char calcShortSum(u_char *);
  96 static int delete(int, struct bootblock *, struct fatEntry *, cl_t, int,
  97     cl_t, int, int);
  98 static int removede(int, struct bootblock *, struct fatEntry *, u_char *,
  99     u_char *, cl_t, cl_t, cl_t, char *, int);
 100 static int checksize(struct bootblock *, struct fatEntry *, u_char *,
 101     struct dosDirEntry *);
 102 static int readDosDirSection(int, struct bootblock *, struct fatEntry *,
 103     struct dosDirEntry *);
 104
 105 /*
 106  * Manage free dosDirEntry structures.
 107  */
 108 static struct dosDirEntry *freede;
 109
 110 static struct dosDirEntry *
 111 newDosDirEntry(void)
 112 {
 113         struct dosDirEntry *de;
 114
 115         if (!(de = freede)) {
 116                 if (!(de = (struct dosDirEntry *)malloc(sizeof *de)))
 117                         return 0;
 118         } else
 119                 freede = de->next;
 120         return de;
 121 }
 122
 123 static void
 124 freeDosDirEntry(struct dosDirEntry *de)
 125 {
 126         de->next = freede;
 127         freede = de;
 128 }
 129
 130 /*
 131  * The same for dirTodoNode structures.
 132  */
 133 static struct dirTodoNode *freedt;
 134
 135 static struct dirTodoNode *
 136 newDirTodo(void)
 137 {
 138         struct dirTodoNode *dt;
 139
 140         if (!(dt = freedt)) {
 141                 if (!(dt = (struct dirTodoNode *)malloc(sizeof *dt)))
 142                         return 0;
 143         } else
 144                 freedt = dt->next;
 145         return dt;
 146 }
 147
 148 static void
 149 freeDirTodo(struct dirTodoNode *dt)
 150 {
 151         dt->next = freedt;
 152         freedt = dt;
 153 }
 154
 155 /*
 156  * The stack of unread directories
 157  */
 158 struct dirTodoNode *pendingDirectories = NULL;
 159
 160 /*
 161  * Return the full pathname for a directory entry.
 162  */
 163 static char *
 164 fullpath(struct dosDirEntry *dir)
 165 {
 166         static char namebuf[MAXPATHLEN + 1];
 167         char *cp, *np;
 168         int nl;
 169
 170         cp = namebuf + sizeof namebuf;
 171         *--cp = '\0';
 172
 173         for(;;) {
 174                 np = dir->lname[0] ? dir->lname : dir->name;
 175                 nl = strlen(np);
 176                 if (cp <= namebuf + 1 + nl) {
 177                         *--cp = '?';
 178                         break;
 179                 }
 180                 cp -= nl;
 181                 memcpy(cp, np, nl);
 182                 dir = dir->parent;
 183                 if (!dir)
 184                         break;
 185                 *--cp = '/';
 186         }
 187
 188         return cp;
 189 }
 190
 191 /*
 192  * Calculate a checksum over an 8.3 alias name
 193  */
 194 static u_char
 195 calcShortSum(u_char *p)
 196 {
 197         u_char sum = 0;
 198         int i;
 199
 200         for (i = 0; i < 11; i++) {
 201                 sum = (sum << 7)|(sum >> 1);    /* rotate right */
 202                 sum += p[i];
 203         }
 204
 205         return sum;
 206 }
 207
 208 /*
 209  * Global variables temporarily used during a directory scan
 210  */
 211 static char longName[DOSLONGNAMELEN] = "";
 212 static u_char *buffer = NULL;
 213 static u_char *delbuf = NULL;
 214
 215 struct dosDirEntry *rootDir;
 216 static struct dosDirEntry *lostDir;
 217
 218 /*
 219  * Init internal state for a new directory scan.
 220  */
 221 int
 222 resetDosDirSection(struct bootblock *boot, struct fatEntry *fat)
 223 {
 224         int b1, b2;
 225         cl_t cl;
 226         int ret = FSOK;
 227
 228         b1 = boot->RootDirEnts * 32;
 229         b2 = boot->SecPerClust * boot->BytesPerSec;
 230
 231         if (!(buffer = malloc(b1 > b2 ? b1 : b2))
 232             || !(delbuf = malloc(b2))
 233             || !(rootDir = newDosDirEntry())) {
 234                 perror("No space for directory");
 235                 return FSFATAL;
 236         }
 237         memset(rootDir, 0, sizeof *rootDir);
 238         if (boot->flags & FAT32) {
 239                 if (boot->RootCl < CLUST_FIRST || boot->RootCl >= boot->NumClusters) {
 240                         pfatal("Root directory starts with cluster out of range(%u)",
 241                                boot->RootCl);
 242                         return FSFATAL;
 243                 }
 244                 cl = fat[boot->RootCl].next;
 245                 if (cl < CLUST_FIRST
 246                     || (cl >= CLUST_RSRVD && cl< CLUST_EOFS)
 247                     || fat[boot->RootCl].head != boot->RootCl) {
 248                         if (cl == CLUST_FREE)
 249                                 pwarn("Root directory starts with free cluster\n");
 250                         else if (cl >= CLUST_RSRVD)
 251                                 pwarn("Root directory starts with cluster marked %s\n",
 252                                       rsrvdcltype(cl));
 253                         else {
 254                                 pfatal("Root directory doesn't start a cluster chain");
 255                                 return FSFATAL;
 256                         }
 257                         if (ask(1, "Fix")) {
 258                                 fat[boot->RootCl].next = CLUST_FREE;
 259                                 ret = FSFATMOD;
 260                         } else
 261                                 ret = FSFATAL;
 262                 }
 263
 264                 fat[boot->RootCl].flags |= FAT_USED;
 265                 rootDir->head = boot->RootCl;
 266         }
 267
 268         return ret;
 269 }
 270
 271 /*
 272  * Cleanup after a directory scan
 273  */
 274 void
 275 finishDosDirSection(void)
 276 {
 277         struct dirTodoNode *p, *np;
 278         struct dosDirEntry *d, *nd;
 279
 280         for (p = pendingDirectories; p; p = np) {
 281                 np = p->next;
 282                 freeDirTodo(p);
 283         }
 284         pendingDirectories = NULL;
 285         for (d = rootDir; d; d = nd) {
 286                 if ((nd = d->child) != NULL) {
 287                         d->child = 0;
 288                         continue;
 289                 }
 290                 if (!(nd = d->next))
 291                         nd = d->parent;
 292                 freeDosDirEntry(d);
 293         }
 294         rootDir = lostDir = NULL;
 295         free(buffer);
 296         free(delbuf);
 297         buffer = NULL;
 298         delbuf = NULL;
 299 }
 300
 301 /*
 302  * Delete directory entries between startcl, startoff and endcl, endoff.
 303  */
 304 static int
 305 delete(int f, struct bootblock *boot, struct fatEntry *fat, cl_t startcl,
 306        int startoff, cl_t endcl, int endoff, int notlast)
 307 {
 308         u_char *s, *e;
 309         off_t off;
 310         int clsz = boot->SecPerClust * boot->BytesPerSec;
 311
 312         s = delbuf + startoff;
 313         e = delbuf + clsz;
 314         while (startcl >= CLUST_FIRST && startcl < boot->NumClusters) {
 315                 if (startcl == endcl) {
 316                         if (notlast)
 317                                 break;
 318                         e = delbuf + endoff;
 319                 }
 320                 off = startcl * boot->SecPerClust + boot->ClusterOffset;
 321                 off *= boot->BytesPerSec;
 322                 if (lseek(f, off, SEEK_SET) != off
 323                     || read(f, delbuf, clsz) != clsz) {
 324                         perror("Unable to read directory");
 325                         return FSFATAL;
 326                 }
 327                 while (s < e) {
 328                         *s = SLOT_DELETED;
 329                         s += 32;
 330                 }
 331                 if (lseek(f, off, SEEK_SET) != off
 332                     || write(f, delbuf, clsz) != clsz) {
 333                         perror("Unable to write directory");
 334                         return FSFATAL;
 335                 }
 336                 if (startcl == endcl)
 337                         break;
 338                 startcl = fat[startcl].next;
 339                 s = delbuf;
 340         }
 341         return FSOK;
 342 }
 343
 344 static int
 345 removede(int f, struct bootblock *boot, struct fatEntry *fat, u_char *start,
 346          u_char *end, cl_t startcl, cl_t endcl, cl_t curcl, char *path,
 347          int type)
 348 {
 349         switch (type) {
 350         case 0:
 351                 pwarn("Invalid long filename entry for %s\n", path);
 352                 break;
 353         case 1:
 354                 pwarn("Invalid long filename entry at end of directory %s\n", path);
 355                 break;
 356         case 2:
 357                 pwarn("Invalid long filename entry for volume label\n");
 358                 break;
 359         }
 360         if (ask(0, "Remove")) {
 361                 if (startcl != curcl) {
 362                         if (delete(f, boot, fat,
 363                                    startcl, start - buffer,
 364                                    endcl, end - buffer,
 365                                    endcl == curcl) == FSFATAL)
 366                                 return FSFATAL;
 367                         start = buffer;
 368                 }
 369                 if (endcl == curcl)
 370                         for (; start < end; start += 32)
 371                                 *start = SLOT_DELETED;
 372                 return FSDIRMOD;
 373         }
 374         return FSERROR;
 375 }
 376
 377 /*
 378  * Check an in-memory file entry
 379  */
 380 static int
 381 checksize(struct bootblock *boot, struct fatEntry *fat, u_char *p,
 382           struct dosDirEntry *dir)
 383 {
 384         /*
 385          * Check size on ordinary files
 386          */
 387         int32_t physicalSize;
 388
 389         if (dir->head == CLUST_FREE)
 390                 physicalSize = 0;
 391         else {
 392                 if (dir->head < CLUST_FIRST || dir->head >= boot->NumClusters)
 393                         return FSERROR;
 394                 physicalSize = fat[dir->head].length * boot->ClusterSize;
 395         }
 396         if (physicalSize < dir->size) {
 397                 pwarn("size of %s is %u, should at most be %u\n",
 398                       fullpath(dir), dir->size, physicalSize);
 399                 if (ask(1, "Truncate")) {
 400                         dir->size = physicalSize;
 401                         p[28] = (u_char)physicalSize;
 402                         p[29] = (u_char)(physicalSize >> 8);
 403                         p[30] = (u_char)(physicalSize >> 16);
 404                         p[31] = (u_char)(physicalSize >> 24);
 405                         return FSDIRMOD;
 406                 } else
 407                         return FSERROR;
 408         } else if (physicalSize - dir->size >= boot->ClusterSize) {
 409                 pwarn("%s has too many clusters allocated\n",
 410                       fullpath(dir));
 411                 if (ask(1, "Drop superfluous clusters")) {
 412                         cl_t cl;
 413                         uint32_t sz = 0;
 414
 415                         for (cl = dir->head; (sz += boot->ClusterSize) < dir->size;)
 416                                 cl = fat[cl].next;
 417                         clearchain(boot, fat, fat[cl].next);
 418                         fat[cl].next = CLUST_EOF;
 419                         return FSFATMOD;
 420                 } else
 421                         return FSERROR;
 422         }
 423         return FSOK;
 424 }
 425
 426 /*
 427  * Read a directory and
 428  *   - resolve long name records
 429  *   - enter file and directory records into the parent's list
 430  *   - push directories onto the todo-stack
 431  */
 432 static int
 433 readDosDirSection(int f, struct bootblock *boot, struct fatEntry *fat,
 434                   struct dosDirEntry *dir)
 435 {
 436         struct dosDirEntry dirent, *d;
 437         u_char *p, *vallfn, *invlfn, *empty;
 438         off_t off;
 439         int i, j, k, last;
 440         cl_t cl, valcl = ~0, invcl = ~0, empcl = ~0;
 441         char *t;
 442         u_int lidx = 0;
 443         int shortSum;
 444         int mod = FSOK;
 445 #define THISMOD 0x8000                  /* Only used within this routine */
 446
 447         cl = dir->head;
 448         if (dir->parent && (cl < CLUST_FIRST || cl >= boot->NumClusters)) {
 449                 /*
 450                  * Already handled somewhere else.
 451                  */
 452                 return FSOK;
 453         }
 454         shortSum = -1;
 455         vallfn = invlfn = empty = NULL;
 456         do {
 457                 if (!(boot->flags & FAT32) && !dir->parent) {
 458                         last = boot->RootDirEnts * 32;
 459                         off = boot->ResSectors + boot->FATs * boot->FATsecs;
 460                 } else {
 461                         last = boot->SecPerClust * boot->BytesPerSec;
 462                         off = cl * boot->SecPerClust + boot->ClusterOffset;
 463                 }
 464
 465                 off *= boot->BytesPerSec;
 466                 if (lseek(f, off, SEEK_SET) != off
 467                     || read(f, buffer, last) != last) {
 468                         perror("Unable to read directory");
 469                         return FSFATAL;
 470                 }
 471                 last /= 32;
 472                 /*
 473                  * Check `.' and `..' entries here?                     XXX
 474                  */
 475                 for (p = buffer, i = 0; i < last; i++, p += 32) {
 476                         if (dir->fsckflags & DIREMPWARN) {
 477                                 *p = SLOT_EMPTY;
 478                                 continue;
 479                         }
 480
 481                         if (*p == SLOT_EMPTY || *p == SLOT_DELETED) {
 482                                 if (*p == SLOT_EMPTY) {
 483                                         dir->fsckflags |= DIREMPTY;
 484                                         empty = p;
 485                                         empcl = cl;
 486                                 }
 487                                 continue;
 488                         }
 489
 490                         if (dir->fsckflags & DIREMPTY) {
 491                                 if (!(dir->fsckflags & DIREMPWARN)) {
 492                                         pwarn("%s has entries after end of directory\n",
 493                                               fullpath(dir));
 494                                         if (ask(1, "Extend")) {
 495                                                 u_char *q;
 496
 497                                                 dir->fsckflags &= ~DIREMPTY;
 498                                                 if (delete(f, boot, fat,
 499                                                            empcl, empty - buffer,
 500                                                            cl, p - buffer, 1) == FSFATAL)
 501                                                         return FSFATAL;
 502                                                 q = empcl == cl ? empty : buffer;
 503                                                 for (; q < p; q += 32)
 504                                                         *q = SLOT_DELETED;
 505                                                 mod |= THISMOD|FSDIRMOD;
 506                                         } else if (ask(0, "Truncate"))
 507                                                 dir->fsckflags |= DIREMPWARN;
 508                                 }
 509                                 if (dir->fsckflags & DIREMPWARN) {
 510                                         *p = SLOT_DELETED;
 511                                         mod |= THISMOD|FSDIRMOD;
 512                                         continue;
 513                                 } else if (dir->fsckflags & DIREMPTY)
 514                                         mod |= FSERROR;
 515                                 empty = NULL;
 516                         }
 517
 518                         if (p[11] == ATTR_WIN95) {
 519                                 if (*p & LRFIRST) {
 520                                         if (shortSum != -1) {
 521                                                 if (!invlfn) {
 522                                                         invlfn = vallfn;
 523                                                         invcl = valcl;
 524                                                 }
 525                                         }
 526                                         memset(longName, 0, sizeof longName);
 527                                         shortSum = p[13];
 528                                         vallfn = p;
 529                                         valcl = cl;
 530                                 } else if (shortSum != p[13]
 531                                            || lidx != (*p & LRNOMASK)) {
 532                                         if (!invlfn) {
 533                                                 invlfn = vallfn;
 534                                                 invcl = valcl;
 535                                         }
 536                                         if (!invlfn) {
 537                                                 invlfn = p;
 538                                                 invcl = cl;
 539                                         }
 540                                         vallfn = NULL;
 541                                 }
 542                                 lidx = *p & LRNOMASK;
 543                                 t = longName + --lidx * 13;
 544                                 for (k = 1; k < 11 && t < longName + sizeof(longName); k += 2) {
 545                                         if (!p[k] && !p[k + 1])
 546                                                 break;
 547                                         *t++ = p[k];
 548                                         /*
 549                                          * Warn about those unusable chars in msdosfs here?     XXX
 550                                          */
 551                                         if (p[k + 1])
 552                                                 t[-1] = '?';
 553                                 }
 554                                 if (k >= 11)
 555                                         for (k = 14; k < 26 && t < longName + sizeof(longName); k += 2) {
 556                                                 if (!p[k] && !p[k + 1])
 557                                                         break;
 558                                                 *t++ = p[k];
 559                                                 if (p[k + 1])
 560                                                         t[-1] = '?';
 561                                         }
 562                                 if (k >= 26)
 563                                         for (k = 28; k < 32 && t < longName + sizeof(longName); k += 2) {
 564                                                 if (!p[k] && !p[k + 1])
 565                                                         break;
 566                                                 *t++ = p[k];
 567                                                 if (p[k + 1])
 568                                                         t[-1] = '?';
 569                                         }
 570                                 if (t >= longName + sizeof(longName)) {
 571                                         pwarn("long filename too long\n");
 572                                         if (!invlfn) {
 573                                                 invlfn = vallfn;
 574                                                 invcl = valcl;
 575                                         }
 576                                         vallfn = NULL;
 577                                 }
 578                                 if (p[26] | (p[27] << 8)) {
 579                                         pwarn("long filename record cluster start != 0\n");
 580                                         if (!invlfn) {
 581                                                 invlfn = vallfn;
 582                                                 invcl = cl;
 583                                         }
 584                                         vallfn = NULL;
 585                                 }
 586                                 continue;       /* long records don't carry further
 587                                                  * information */
 588                         }
 589
 590                         /*
 591                          * This is a standard msdosfs directory entry.
 592                          */
 593                         memset(&dirent, 0, sizeof dirent);
 594
 595                         /*
 596                          * it's a short name record, but we need to know
 597                          * more, so get the flags first.
 598                          */
 599                         dirent.flags = p[11];
 600
 601                         /*
 602                          * Translate from 850 to ISO here               XXX
 603                          */
 604                         for (j = 0; j < 8; j++)
 605                                 dirent.name[j] = p[j];
 606                         dirent.name[8] = '\0';
 607                         for (k = 7; k >= 0 && dirent.name[k] == ' '; k--)
 608                                 dirent.name[k] = '\0';
 609                         if (dirent.name[k] != '\0')
 610                                 k++;
 611                         if (dirent.name[0] == SLOT_E5)
 612                                 dirent.name[0] = 0xe5;
 613
 614                         if (dirent.flags & ATTR_VOLUME) {
 615                                 if (vallfn || invlfn) {
 616                                         mod |= removede(f, boot, fat,
 617                                                         invlfn ? invlfn : vallfn, p,
 618                                                         invlfn ? invcl : valcl, -1, 0,
 619                                                         fullpath(dir), 2);
 620                                         vallfn = NULL;
 621                                         invlfn = NULL;
 622                                 }
 623                                 continue;
 624                         }
 625
 626                         if (p[8] != ' ')
 627                                 dirent.name[k++] = '.';
 628                         for (j = 0; j < 3; j++)
 629                                 dirent.name[k++] = p[j+8];
 630                         dirent.name[k] = '\0';
 631                         for (k--; k >= 0 && dirent.name[k] == ' '; k--)
 632                                 dirent.name[k] = '\0';
 633
 634                         if (vallfn && shortSum != calcShortSum(p)) {
 635                                 if (!invlfn) {
 636                                         invlfn = vallfn;
 637                                         invcl = valcl;
 638                                 }
 639                                 vallfn = NULL;
 640                         }
 641                         dirent.head = p[26] | (p[27] << 8);
 642                         if (boot->ClustMask == CLUST32_MASK)
 643                                 dirent.head |= (p[20] << 16) | (p[21] << 24);
 644                         dirent.size = p[28] | (p[29] << 8) | (p[30] << 16) | (p[31] << 24);
 645                         if (vallfn) {
 646                                 strcpy(dirent.lname, longName);
 647                                 longName[0] = '\0';
 648                                 shortSum = -1;
 649                         }
 650
 651                         dirent.parent = dir;
 652                         dirent.next = dir->child;
 653
 654                         if (invlfn) {
 655                                 mod |= k = removede(f, boot, fat,
 656                                                     invlfn, vallfn ? vallfn : p,
 657                                                     invcl, vallfn ? valcl : cl, cl,
 658                                                     fullpath(&dirent), 0);
 659                                 if (mod & FSFATAL)
 660                                         return FSFATAL;
 661                                 if (vallfn
 662                                     ? (valcl == cl && vallfn != buffer)
 663                                     : p != buffer)
 664                                         if (k & FSDIRMOD)
 665                                                 mod |= THISMOD;
 666                         }
 667
 668                         vallfn = NULL; /* not used any longer */
 669                         invlfn = NULL;
 670
 671                         if (dirent.size == 0 && !(dirent.flags & ATTR_DIRECTORY)) {
 672                                 if (dirent.head != 0) {
 673                                         pwarn("%s has clusters, but size 0\n",
 674                                               fullpath(&dirent));
 675                                         if (ask(1, "Drop allocated clusters")) {
 676                                                 p[26] = p[27] = 0;
 677                                                 if (boot->ClustMask == CLUST32_MASK)
 678                                                         p[20] = p[21] = 0;
 679                                                 clearchain(boot, fat, dirent.head);
 680                                                 dirent.head = 0;
 681                                                 mod |= THISMOD|FSDIRMOD|FSFATMOD;
 682                                         } else
 683                                                 mod |= FSERROR;
 684                                 }
 685                         } else if (dirent.head == 0
 686                                    && !strcmp(dirent.name, "..")
 687                                    && dir->parent                       /* XXX */
 688                                    && !dir->parent->parent) {
 689                                 /*
 690                                  *  Do nothing, the parent is the root
 691                                  */
 692                         } else if (dirent.head < CLUST_FIRST
 693                                    || dirent.head >= boot->NumClusters
 694                                    || fat[dirent.head].next == CLUST_FREE
 695                                    || (fat[dirent.head].next >= CLUST_RSRVD
 696                                        && fat[dirent.head].next < CLUST_EOFS)
 697                                    || fat[dirent.head].head != dirent.head) {
 698                                 if (dirent.head == 0)
 699                                         pwarn("%s has no clusters\n",
 700                                               fullpath(&dirent));
 701                                 else if (dirent.head < CLUST_FIRST
 702                                          || dirent.head >= boot->NumClusters)
 703                                         pwarn("%s starts with cluster out of range(%u)\n",
 704                                               fullpath(&dirent),
 705                                               dirent.head);
 706                                 else if (fat[dirent.head].next == CLUST_FREE)
 707                                         pwarn("%s starts with free cluster\n",
 708                                               fullpath(&dirent));
 709                                 else if (fat[dirent.head].next >= CLUST_RSRVD)
 710                                         pwarn("%s starts with cluster marked %s\n",
 711                                               fullpath(&dirent),
 712                                               rsrvdcltype(fat[dirent.head].next));
 713                                 else
 714                                         pwarn("%s doesn't start a cluster chain\n",
 715                                               fullpath(&dirent));
 716                                 if (dirent.flags & ATTR_DIRECTORY) {
 717                                         if (ask(0, "Remove")) {
 718                                                 *p = SLOT_DELETED;
 719                                                 mod |= THISMOD|FSDIRMOD;
 720                                         } else
 721                                                 mod |= FSERROR;
 722                                         continue;
 723                                 } else {
 724                                         if (ask(1, "Truncate")) {
 725                                                 p[28] = p[29] = p[30] = p[31] = 0;
 726                                                 p[26] = p[27] = 0;
 727                                                 if (boot->ClustMask == CLUST32_MASK)
 728                                                         p[20] = p[21] = 0;
 729                                                 dirent.size = 0;
 730                                                 mod |= THISMOD|FSDIRMOD;
 731                                         } else
 732                                                 mod |= FSERROR;
 733                                 }
 734                         }
 735
 736                         if (dirent.head >= CLUST_FIRST && dirent.head < boot->NumClusters)
 737                                 fat[dirent.head].flags |= FAT_USED;
 738
 739                         if (dirent.flags & ATTR_DIRECTORY) {
 740                                 /*
 741                                  * gather more info for directories
 742                                  */
 743                                 struct dirTodoNode *n;
 744
 745                                 if (dirent.size) {
 746                                         pwarn("Directory %s has size != 0\n",
 747                                               fullpath(&dirent));
 748                                         if (ask(1, "Correct")) {
 749                                                 p[28] = p[29] = p[30] = p[31] = 0;
 750                                                 dirent.size = 0;
 751                                                 mod |= THISMOD|FSDIRMOD;
 752                                         } else
 753                                                 mod |= FSERROR;
 754                                 }
 755                                 /*
 756                                  * handle `.' and `..' specially
 757                                  */
 758                                 if (strcmp(dirent.name, ".") == 0) {
 759                                         if (dirent.head != dir->head) {
 760                                                 pwarn("`.' entry in %s has incorrect start cluster\n",
 761                                                       fullpath(dir));
 762                                                 if (ask(1, "Correct")) {
 763                                                         dirent.head = dir->head;
 764                                                         p[26] = (u_char)dirent.head;
 765                                                         p[27] = (u_char)(dirent.head >> 8);
 766                                                         if (boot->ClustMask == CLUST32_MASK) {
 767                                                                 p[20] = (u_char)(dirent.head >> 16);
 768                                                                 p[21] = (u_char)(dirent.head >> 24);
 769                                                         }
 770                                                         mod |= THISMOD|FSDIRMOD;
 771                                                 } else
 772                                                         mod |= FSERROR;
 773                                         }
 774                                         continue;
 775                                 }
 776                                 if (strcmp(dirent.name, "..") == 0) {
 777                                         if (dir->parent) {              /* XXX */
 778                                                 if (!dir->parent->parent) {
 779                                                         if (dirent.head) {
 780                                                                 pwarn("`..' entry in %s has non-zero start cluster\n",
 781                                                                       fullpath(dir));
 782                                                                 if (ask(1, "Correct")) {
 783                                                                         dirent.head = 0;
 784                                                                         p[26] = p[27] = 0;
 785                                                                         if (boot->ClustMask == CLUST32_MASK)
 786                                                                                 p[20] = p[21] = 0;
 787                                                                         mod |= THISMOD|FSDIRMOD;
 788                                                                 } else
 789                                                                         mod |= FSERROR;
 790                                                         }
 791                                                 } else if (dirent.head != dir->parent->head) {
 792                                                         pwarn("`..' entry in %s has incorrect start cluster\n",
 793                                                               fullpath(dir));
 794                                                         if (ask(1, "Correct")) {
 795                                                                 dirent.head = dir->parent->head;
 796                                                                 p[26] = (u_char)dirent.head;
 797                                                                 p[27] = (u_char)(dirent.head >> 8);
 798                                                                 if (boot->ClustMask == CLUST32_MASK) {
 799                                                                         p[20] = (u_char)(dirent.head >> 16);
 800                                                                         p[21] = (u_char)(dirent.head >> 24);
 801                                                                 }
 802                                                                 mod |= THISMOD|FSDIRMOD;
 803                                                         } else
 804                                                                 mod |= FSERROR;
 805                                                 }
 806                                         }
 807                                         continue;
 808                                 }
 809
 810                                 /* create directory tree node */
 811                                 if (!(d = newDosDirEntry())) {
 812                                         perror("No space for directory");
 813                                         return FSFATAL;
 814                                 }
 815                                 memcpy(d, &dirent, sizeof(struct dosDirEntry));
 816                                 /* link it into the tree */
 817                                 dir->child = d;
 818
 819                                 /* Enter this directory into the todo list */
 820                                 if (!(n = newDirTodo())) {
 821                                         perror("No space for todo list");
 822                                         return FSFATAL;
 823                                 }
 824                                 n->next = pendingDirectories;
 825                                 n->dir = d;
 826                                 pendingDirectories = n;
 827                         } else {
 828                                 mod |= k = checksize(boot, fat, p, &dirent);
 829                                 if (k & FSDIRMOD)
 830                                         mod |= THISMOD;
 831                         }
 832                         boot->NumFiles++;
 833                 }
 834                 if (mod & THISMOD) {
 835                         last *= 32;
 836                         if (lseek(f, off, SEEK_SET) != off
 837                             || write(f, buffer, last) != last) {
 838                                 perror("Unable to write directory");
 839                                 return FSFATAL;
 840                         }
 841                         mod &= ~THISMOD;
 842                 }
 843         } while ((cl = fat[cl].next) >= CLUST_FIRST && cl < boot->NumClusters);
 844         if (invlfn || vallfn)
 845                 mod |= removede(f, boot, fat,
 846                                 invlfn ? invlfn : vallfn, p,
 847                                 invlfn ? invcl : valcl, -1, 0,
 848                                 fullpath(dir), 1);
 849         return mod & ~THISMOD;
 850 }
 851
 852 int
 853 handleDirTree(int dosfs, struct bootblock *boot, struct fatEntry *fat)
 854 {
 855         int mod;
 856
 857         mod = readDosDirSection(dosfs, boot, fat, rootDir);
 858         if (mod & FSFATAL)
 859                 return FSFATAL;
 860
 861         /*
 862          * process the directory todo list
 863          */
 864         while (pendingDirectories) {
 865                 struct dosDirEntry *dir = pendingDirectories->dir;
 866                 struct dirTodoNode *n = pendingDirectories->next;
 867
 868                 /*
 869                  * remove TODO entry now, the list might change during
 870                  * directory reads
 871                  */
 872                 freeDirTodo(pendingDirectories);
 873                 pendingDirectories = n;
 874
 875                 /*
 876                  * handle subdirectory
 877                  */
 878                 mod |= readDosDirSection(dosfs, boot, fat, dir);
 879                 if (mod & FSFATAL)
 880                         return FSFATAL;
 881         }
 882
 883         return mod;
 884 }
 885
 886 /*
 887  * Try to reconnect a FAT chain into dir
 888  */
 889 static u_char *lfbuf;
 890 static cl_t lfcl;
 891 static off_t lfoff;
 892
 893 int
 894 reconnect(int dosfs, struct bootblock *boot, struct fatEntry *fat, cl_t head)
 895 {
 896         struct dosDirEntry d;
 897         u_char *p;
 898
 899         if (!ask(1, "Reconnect"))
 900                 return FSERROR;
 901
 902         if (!lostDir) {
 903                 for (lostDir = rootDir->child; lostDir; lostDir = lostDir->next) {
 904                         if (!strcmp(lostDir->name, LOSTDIR))
 905                                 break;
 906                 }
 907                 if (!lostDir) {         /* Create LOSTDIR?              XXX */
 908                         pwarn("No %s directory\n", LOSTDIR);
 909                         return FSERROR;
 910                 }
 911         }
 912         if (!lfbuf) {
 913                 lfbuf = malloc(boot->ClusterSize);
 914                 if (!lfbuf) {
 915                         perror("No space for buffer");
 916                         return FSFATAL;
 917                 }
 918                 p = NULL;
 919         } else
 920                 p = lfbuf;
 921         while (1) {
 922                 if (p)
 923                         for (; p < lfbuf + boot->ClusterSize; p += 32)
 924                                 if (*p == SLOT_EMPTY
 925                                     || *p == SLOT_DELETED)
 926                                         break;
 927                 if (p && p < lfbuf + boot->ClusterSize)
 928                         break;
 929                 lfcl = p ? fat[lfcl].next : lostDir->head;
 930                 if (lfcl < CLUST_FIRST || lfcl >= boot->NumClusters) {
 931                         /* Extend LOSTDIR?                              XXX */
 932                         pwarn("No space in %s\n", LOSTDIR);
 933                         return FSERROR;
 934                 }
 935                 lfoff = lfcl * boot->ClusterSize
 936                     + boot->ClusterOffset * boot->BytesPerSec;
 937                 if (lseek(dosfs, lfoff, SEEK_SET) != lfoff
 938                     || read(dosfs, lfbuf, boot->ClusterSize) != boot->ClusterSize) {
 939                         perror("could not read LOST.DIR");
 940                         return FSFATAL;
 941                 }
 942                 p = lfbuf;
 943         }
 944
 945         boot->NumFiles++;
 946         /* Ensure uniqueness of entry here!                             XXX */
 947         memset(&d, 0, sizeof d);
 948         snprintf(d.name, sizeof(d.name), "%u", head);
 949         d.flags = 0;
 950         d.head = head;
 951         d.size = fat[head].length * boot->ClusterSize;
 952
 953         memset(p, 0, 32);
 954         memset(p, ' ', 11);
 955         memcpy(p, d.name, strlen(d.name));
 956         p[26] = (u_char)d.head;
 957         p[27] = (u_char)(d.head >> 8);
 958         if (boot->ClustMask == CLUST32_MASK) {
 959                 p[20] = (u_char)(d.head >> 16);
 960                 p[21] = (u_char)(d.head >> 24);
 961         }
 962         p[28] = (u_char)d.size;
 963         p[29] = (u_char)(d.size >> 8);
 964         p[30] = (u_char)(d.size >> 16);
 965         p[31] = (u_char)(d.size >> 24);
 966         fat[head].flags |= FAT_USED;
 967         if (lseek(dosfs, lfoff, SEEK_SET) != lfoff
 968             || write(dosfs, lfbuf, boot->ClusterSize) != boot->ClusterSize) {
 969                 perror("could not write LOST.DIR");
 970                 return FSFATAL;
 971         }
 972         return FSDIRMOD;
 973 }
 974
 975 void
 976 finishlf(void)
 977 {
 978         if (lfbuf)
 979                 free(lfbuf);
 980         lfbuf = NULL;
 981 }