source3/smbd/dir.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    Directory handling routines
   4    Copyright (C) Andrew Tridgell 1992-1998
   5    Copyright (C) Jeremy Allison 2007
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 3 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  19 */
  20
  21 #include "includes.h"
  22 #include "smbd/globals.h"
  23
  24 /*
  25    This module implements directory related functions for Samba.
  26 */
  27
  28 /* "Special" directory offsets. */
  29 #define END_OF_DIRECTORY_OFFSET ((long)-1)
  30 #define START_OF_DIRECTORY_OFFSET ((long)0)
  31 #define DOT_DOT_DIRECTORY_OFFSET ((long)0x80000000)
  32
  33 /* Make directory handle internals available. */
  34
  35 struct name_cache_entry {
  36         char *name;
  37         long offset;
  38 };
  39
  40 struct smb_Dir {
  41         connection_struct *conn;
  42         SMB_STRUCT_DIR *dir;
  43         long offset;
  44         char *dir_path;
  45         size_t name_cache_size;
  46         struct name_cache_entry *name_cache;
  47         unsigned int name_cache_index;
  48         unsigned int file_number;
  49 };
  50
  51 struct dptr_struct {
  52         struct dptr_struct *next, *prev;
  53         int dnum;
  54         uint16 spid;
  55         struct connection_struct *conn;
  56         struct smb_Dir *dir_hnd;
  57         bool expect_close;
  58         char *wcard;
  59         uint32 attr;
  60         char *path;
  61         bool has_wild; /* Set to true if the wcard entry has MS wildcard characters in it. */
  62         bool did_stat; /* Optimisation for non-wcard searches. */
  63 };
  64
  65
  66 #define INVALID_DPTR_KEY (-3)
  67
  68 /****************************************************************************
  69  Make a dir struct.
  70 ****************************************************************************/
  71
  72 bool make_dir_struct(TALLOC_CTX *ctx,
  73                         char *buf,
  74                         const char *mask,
  75                         const char *fname,
  76                         SMB_OFF_T size,
  77                         uint32 mode,
  78                         time_t date,
  79                         bool uc)
  80 {
  81         char *p;
  82         char *mask2 = talloc_strdup(ctx, mask);
  83
  84         if (!mask2) {
  85                 return False;
  86         }
  87
  88         if ((mode & aDIR) != 0) {
  89                 size = 0;
  90         }
  91
  92         memset(buf+1,' ',11);
  93         if ((p = strchr_m(mask2,'.')) != NULL) {
  94                 *p = 0;
  95                 push_ascii(buf+1,mask2,8, 0);
  96                 push_ascii(buf+9,p+1,3, 0);
  97                 *p = '.';
  98         } else {
  99                 push_ascii(buf+1,mask2,11, 0);
 100         }
 101
 102         memset(buf+21,'\0',DIR_STRUCT_SIZE-21);
 103         SCVAL(buf,21,mode);
 104         srv_put_dos_date(buf,22,date);
 105         SSVAL(buf,26,size & 0xFFFF);
 106         SSVAL(buf,28,(size >> 16)&0xFFFF);
 107         /* We only uppercase if FLAGS2_LONG_PATH_COMPONENTS is zero in the input buf.
 108            Strange, but verified on W2K3. Needed for OS/2. JRA. */
 109         push_ascii(buf+30,fname,12, uc ? STR_UPPER : 0);
 110         DEBUG(8,("put name [%s] from [%s] into dir struct\n",buf+30, fname));
 111         return True;
 112 }
 113
 114 /****************************************************************************
 115  Initialise the dir bitmap.
 116 ****************************************************************************/
 117
 118 void init_dptrs(void)
 119 {
 120         if (dptr_bmap)
 121                 return;
 122
 123         dptr_bmap = bitmap_allocate(MAX_DIRECTORY_HANDLES);
 124
 125         if (!dptr_bmap)
 126                 exit_server("out of memory in init_dptrs");
 127 }
 128
 129 /****************************************************************************
 130  Idle a dptr - the directory is closed but the control info is kept.
 131 ****************************************************************************/
 132
 133 static void dptr_idle(struct dptr_struct *dptr)
 134 {
 135         if (dptr->dir_hnd) {
 136                 DEBUG(4,("Idling dptr dnum %d\n",dptr->dnum));
 137                 TALLOC_FREE(dptr->dir_hnd);
 138         }
 139 }
 140
 141 /****************************************************************************
 142  Idle the oldest dptr.
 143 ****************************************************************************/
 144
 145 static void dptr_idleoldest(void)
 146 {
 147         struct dptr_struct *dptr;
 148
 149         /*
 150          * Go to the end of the list.
 151          */
 152         for(dptr = dirptrs; dptr && dptr->next; dptr = dptr->next)
 153                 ;
 154
 155         if(!dptr) {
 156                 DEBUG(0,("No dptrs available to idle ?\n"));
 157                 return;
 158         }
 159
 160         /*
 161          * Idle the oldest pointer.
 162          */
 163
 164         for(; dptr; dptr = dptr->prev) {
 165                 if (dptr->dir_hnd) {
 166                         dptr_idle(dptr);
 167                         return;
 168                 }
 169         }
 170 }
 171
 172 /****************************************************************************
 173  Get the struct dptr_struct for a dir index.
 174 ****************************************************************************/
 175
 176 static struct dptr_struct *dptr_get(int key, bool forclose)
 177 {
 178         struct dptr_struct *dptr;
 179
 180         for(dptr = dirptrs; dptr; dptr = dptr->next) {
 181                 if(dptr->dnum == key) {
 182                         if (!forclose && !dptr->dir_hnd) {
 183                                 if (dirhandles_open >= MAX_OPEN_DIRECTORIES)
 184                                         dptr_idleoldest();
 185                                 DEBUG(4,("dptr_get: Reopening dptr key %d\n",key));
 186                                 if (!(dptr->dir_hnd = OpenDir(
 187                                               NULL, dptr->conn, dptr->path,
 188                                               dptr->wcard, dptr->attr))) {
 189                                         DEBUG(4,("dptr_get: Failed to open %s (%s)\n",dptr->path,
 190                                                 strerror(errno)));
 191                                         return False;
 192                                 }
 193                         }
 194                         DLIST_PROMOTE(dirptrs,dptr);
 195                         return dptr;
 196                 }
 197         }
 198         return(NULL);
 199 }
 200
 201 /****************************************************************************
 202  Get the dir path for a dir index.
 203 ****************************************************************************/
 204
 205 char *dptr_path(int key)
 206 {
 207         struct dptr_struct *dptr = dptr_get(key, False);
 208         if (dptr)
 209                 return(dptr->path);
 210         return(NULL);
 211 }
 212
 213 /****************************************************************************
 214  Get the dir wcard for a dir index.
 215 ****************************************************************************/
 216
 217 char *dptr_wcard(int key)
 218 {
 219         struct dptr_struct *dptr = dptr_get(key, False);
 220         if (dptr)
 221                 return(dptr->wcard);
 222         return(NULL);
 223 }
 224
 225 /****************************************************************************
 226  Get the dir attrib for a dir index.
 227 ****************************************************************************/
 228
 229 uint16 dptr_attr(int key)
 230 {
 231         struct dptr_struct *dptr = dptr_get(key, False);
 232         if (dptr)
 233                 return(dptr->attr);
 234         return(0);
 235 }
 236
 237 /****************************************************************************
 238  Close a dptr (internal func).
 239 ****************************************************************************/
 240
 241 static void dptr_close_internal(struct dptr_struct *dptr)
 242 {
 243         DEBUG(4,("closing dptr key %d\n",dptr->dnum));
 244
 245         DLIST_REMOVE(dirptrs, dptr);
 246
 247         /*
 248          * Free the dnum in the bitmap. Remember the dnum value is always
 249          * biased by one with respect to the bitmap.
 250          */
 251
 252         if(bitmap_query( dptr_bmap, dptr->dnum - 1) != True) {
 253                 DEBUG(0,("dptr_close_internal : Error - closing dnum = %d and bitmap not set !\n",
 254                         dptr->dnum ));
 255         }
 256
 257         bitmap_clear(dptr_bmap, dptr->dnum - 1);
 258
 259         TALLOC_FREE(dptr->dir_hnd);
 260
 261         /* Lanman 2 specific code */
 262         SAFE_FREE(dptr->wcard);
 263         string_set(&dptr->path,"");
 264         SAFE_FREE(dptr);
 265 }
 266
 267 /****************************************************************************
 268  Close a dptr given a key.
 269 ****************************************************************************/
 270
 271 void dptr_close(int *key)
 272 {
 273         struct dptr_struct *dptr;
 274
 275         if(*key == INVALID_DPTR_KEY)
 276                 return;
 277
 278         /* OS/2 seems to use -1 to indicate "close all directories" */
 279         if (*key == -1) {
 280                 struct dptr_struct *next;
 281                 for(dptr = dirptrs; dptr; dptr = next) {
 282                         next = dptr->next;
 283                         dptr_close_internal(dptr);
 284                 }
 285                 *key = INVALID_DPTR_KEY;
 286                 return;
 287         }
 288
 289         dptr = dptr_get(*key, True);
 290
 291         if (!dptr) {
 292                 DEBUG(0,("Invalid key %d given to dptr_close\n", *key));
 293                 return;
 294         }
 295
 296         dptr_close_internal(dptr);
 297
 298         *key = INVALID_DPTR_KEY;
 299 }
 300
 301 /****************************************************************************
 302  Close all dptrs for a cnum.
 303 ****************************************************************************/
 304
 305 void dptr_closecnum(connection_struct *conn)
 306 {
 307         struct dptr_struct *dptr, *next;
 308         for(dptr = dirptrs; dptr; dptr = next) {
 309                 next = dptr->next;
 310                 if (dptr->conn == conn)
 311                         dptr_close_internal(dptr);
 312         }
 313 }
 314
 315 /****************************************************************************
 316  Idle all dptrs for a cnum.
 317 ****************************************************************************/
 318
 319 void dptr_idlecnum(connection_struct *conn)
 320 {
 321         struct dptr_struct *dptr;
 322         for(dptr = dirptrs; dptr; dptr = dptr->next) {
 323                 if (dptr->conn == conn && dptr->dir_hnd)
 324                         dptr_idle(dptr);
 325         }
 326 }
 327
 328 /****************************************************************************
 329  Close a dptr that matches a given path, only if it matches the spid also.
 330 ****************************************************************************/
 331
 332 void dptr_closepath(char *path,uint16 spid)
 333 {
 334         struct dptr_struct *dptr, *next;
 335         for(dptr = dirptrs; dptr; dptr = next) {
 336                 next = dptr->next;
 337                 if (spid == dptr->spid && strequal(dptr->path,path))
 338                         dptr_close_internal(dptr);
 339         }
 340 }
 341
 342 /****************************************************************************
 343  Try and close the oldest handle not marked for
 344  expect close in the hope that the client has
 345  finished with that one.
 346 ****************************************************************************/
 347
 348 static void dptr_close_oldest(bool old)
 349 {
 350         struct dptr_struct *dptr;
 351
 352         /*
 353          * Go to the end of the list.
 354          */
 355         for(dptr = dirptrs; dptr && dptr->next; dptr = dptr->next)
 356                 ;
 357
 358         if(!dptr) {
 359                 DEBUG(0,("No old dptrs available to close oldest ?\n"));
 360                 return;
 361         }
 362
 363         /*
 364          * If 'old' is true, close the oldest oldhandle dnum (ie. 1 < dnum < 256) that
 365          * does not have expect_close set. If 'old' is false, close
 366          * one of the new dnum handles.
 367          */
 368
 369         for(; dptr; dptr = dptr->prev) {
 370                 if ((old && (dptr->dnum < 256) && !dptr->expect_close) ||
 371                         (!old && (dptr->dnum > 255))) {
 372                                 dptr_close_internal(dptr);
 373                                 return;
 374                 }
 375         }
 376 }
 377
 378 /****************************************************************************
 379  Create a new dir ptr. If the flag old_handle is true then we must allocate
 380  from the bitmap range 0 - 255 as old SMBsearch directory handles are only
 381  one byte long. If old_handle is false we allocate from the range
 382  256 - MAX_DIRECTORY_HANDLES. We bias the number we return by 1 to ensure
 383  a directory handle is never zero.
 384  wcard must not be zero.
 385 ****************************************************************************/
 386
 387 NTSTATUS dptr_create(connection_struct *conn, const char *path, bool old_handle, bool expect_close,uint16 spid,
 388                 const char *wcard, bool wcard_has_wild, uint32 attr, struct dptr_struct **dptr_ret)
 389 {
 390         struct dptr_struct *dptr = NULL;
 391         struct smb_Dir *dir_hnd;
 392         NTSTATUS status;
 393
 394         DEBUG(5,("dptr_create dir=%s\n", path));
 395
 396         if (!wcard) {
 397                 return NT_STATUS_INVALID_PARAMETER;
 398         }
 399
 400         status = check_name(conn,path);
 401         if (!NT_STATUS_IS_OK(status)) {
 402                 return status;
 403         }
 404
 405         dir_hnd = OpenDir(NULL, conn, path, wcard, attr);
 406         if (!dir_hnd) {
 407                 return map_nt_error_from_unix(errno);
 408         }
 409
 410         string_set(&conn->dirpath,path);
 411
 412         if (dirhandles_open >= MAX_OPEN_DIRECTORIES) {
 413                 dptr_idleoldest();
 414         }
 415
 416         dptr = SMB_MALLOC_P(struct dptr_struct);
 417         if(!dptr) {
 418                 DEBUG(0,("malloc fail in dptr_create.\n"));
 419                 TALLOC_FREE(dir_hnd);
 420                 return NT_STATUS_NO_MEMORY;
 421         }
 422
 423         ZERO_STRUCTP(dptr);
 424
 425         if(old_handle) {
 426
 427                 /*
 428                  * This is an old-style SMBsearch request. Ensure the
 429                  * value we return will fit in the range 1-255.
 430                  */
 431
 432                 dptr->dnum = bitmap_find(dptr_bmap, 0);
 433
 434                 if(dptr->dnum == -1 || dptr->dnum > 254) {
 435
 436                         /*
 437                          * Try and close the oldest handle not marked for
 438                          * expect close in the hope that the client has
 439                          * finished with that one.
 440                          */
 441
 442                         dptr_close_oldest(True);
 443
 444                         /* Now try again... */
 445                         dptr->dnum = bitmap_find(dptr_bmap, 0);
 446                         if(dptr->dnum == -1 || dptr->dnum > 254) {
 447                                 DEBUG(0,("dptr_create: returned %d: Error - all old dirptrs in use ?\n", dptr->dnum));
 448                                 SAFE_FREE(dptr);
 449                                 TALLOC_FREE(dir_hnd);
 450                                 return NT_STATUS_TOO_MANY_OPENED_FILES;
 451                         }
 452                 }
 453         } else {
 454
 455                 /*
 456                  * This is a new-style trans2 request. Allocate from
 457                  * a range that will return 256 - MAX_DIRECTORY_HANDLES.
 458                  */
 459
 460                 dptr->dnum = bitmap_find(dptr_bmap, 255);
 461
 462                 if(dptr->dnum == -1 || dptr->dnum < 255) {
 463
 464                         /*
 465                          * Try and close the oldest handle close in the hope that
 466                          * the client has finished with that one. This will only
 467                          * happen in the case of the Win98 client bug where it leaks
 468                          * directory handles.
 469                          */
 470
 471                         dptr_close_oldest(False);
 472
 473                         /* Now try again... */
 474                         dptr->dnum = bitmap_find(dptr_bmap, 255);
 475
 476                         if(dptr->dnum == -1 || dptr->dnum < 255) {
 477                                 DEBUG(0,("dptr_create: returned %d: Error - all new dirptrs in use ?\n", dptr->dnum));
 478                                 SAFE_FREE(dptr);
 479                                 TALLOC_FREE(dir_hnd);
 480                                 return NT_STATUS_TOO_MANY_OPENED_FILES;
 481                         }
 482                 }
 483         }
 484
 485         bitmap_set(dptr_bmap, dptr->dnum);
 486
 487         dptr->dnum += 1; /* Always bias the dnum by one - no zero dnums allowed. */
 488
 489         string_set(&dptr->path,path);
 490         dptr->conn = conn;
 491         dptr->dir_hnd = dir_hnd;
 492         dptr->spid = spid;
 493         dptr->expect_close = expect_close;
 494         dptr->wcard = SMB_STRDUP(wcard);
 495         if (!dptr->wcard) {
 496                 bitmap_clear(dptr_bmap, dptr->dnum - 1);
 497                 SAFE_FREE(dptr);
 498                 TALLOC_FREE(dir_hnd);
 499                 return NT_STATUS_NO_MEMORY;
 500         }
 501         if (lp_posix_pathnames() || (wcard[0] == '.' && wcard[1] == 0)) {
 502                 dptr->has_wild = True;
 503         } else {
 504                 dptr->has_wild = wcard_has_wild;
 505         }
 506
 507         dptr->attr = attr;
 508
 509         DLIST_ADD(dirptrs, dptr);
 510
 511         DEBUG(3,("creating new dirptr %d for path %s, expect_close = %d\n",
 512                 dptr->dnum,path,expect_close));
 513
 514         *dptr_ret = dptr;
 515
 516         return NT_STATUS_OK;
 517 }
 518
 519
 520 /****************************************************************************
 521  Wrapper functions to access the lower level directory handles.
 522 ****************************************************************************/
 523
 524 int dptr_CloseDir(struct dptr_struct *dptr)
 525 {
 526         DLIST_REMOVE(dirptrs, dptr);
 527         TALLOC_FREE(dptr->dir_hnd);
 528         return 0;
 529 }
 530
 531 void dptr_SeekDir(struct dptr_struct *dptr, long offset)
 532 {
 533         SeekDir(dptr->dir_hnd, offset);
 534 }
 535
 536 long dptr_TellDir(struct dptr_struct *dptr)
 537 {
 538         return TellDir(dptr->dir_hnd);
 539 }
 540
 541 bool dptr_has_wild(struct dptr_struct *dptr)
 542 {
 543         return dptr->has_wild;
 544 }
 545
 546 int dptr_dnum(struct dptr_struct *dptr)
 547 {
 548         return dptr->dnum;
 549 }
 550
 551 /****************************************************************************
 552  Return the next visible file name, skipping veto'd and invisible files.
 553 ****************************************************************************/
 554
 555 static const char *dptr_normal_ReadDirName(struct dptr_struct *dptr,
 556                                            long *poffset, SMB_STRUCT_STAT *pst)
 557 {
 558         /* Normal search for the next file. */
 559         const char *name;
 560         while ((name = ReadDirName(dptr->dir_hnd, poffset, pst)) != NULL) {
 561                 if (is_visible_file(dptr->conn, dptr->path, name, pst, True)) {
 562                         return name;
 563                 }
 564         }
 565         return NULL;
 566 }
 567
 568 /****************************************************************************
 569  Return the next visible file name, skipping veto'd and invisible files.
 570 ****************************************************************************/
 571
 572 const char *dptr_ReadDirName(TALLOC_CTX *ctx,
 573                         struct dptr_struct *dptr,
 574                         long *poffset,
 575                         SMB_STRUCT_STAT *pst)
 576 {
 577         char *name = NULL;
 578         char *pathreal = NULL;
 579         SET_STAT_INVALID(*pst);
 580
 581         if (dptr->has_wild || dptr->did_stat) {
 582                 return dptr_normal_ReadDirName(dptr, poffset, pst);
 583         }
 584
 585         /* If poffset is -1 then we know we returned this name before and we
 586          * have no wildcards. We're at the end of the directory. */
 587         if (*poffset == END_OF_DIRECTORY_OFFSET) {
 588                 return NULL;
 589         }
 590
 591         /* We know the stored wcard contains no wildcard characters.
 592          * See if we can match with a stat call. If we can't, then set
 593          * did_stat to true to ensure we only do this once and keep
 594          * searching. */
 595
 596         dptr->did_stat = true;
 597
 598         /* First check if it should be visible. */
 599         if (!is_visible_file(dptr->conn, dptr->path, dptr->wcard,
 600             pst, true))
 601         {
 602                 /* This only returns false if the file was found, but
 603                    is explicitly not visible. Set us to end of
 604                    directory, but return NULL as we know we can't ever
 605                    find it. */
 606                 goto ret;
 607         }
 608
 609         if (VALID_STAT(*pst)) {
 610                 name = dptr->wcard;
 611                 goto ret;
 612         }
 613
 614         pathreal = talloc_asprintf(ctx,
 615                                 "%s/%s",
 616                                 dptr->path,
 617                                 dptr->wcard);
 618         if (!pathreal)
 619                 return NULL;
 620
 621         if (SMB_VFS_STAT(dptr->conn, pathreal, pst) == 0) {
 622                 name = dptr->wcard;
 623                 goto clean;
 624         } else {
 625                 /* If we get any other error than ENOENT or ENOTDIR
 626                    then the file exists we just can't stat it. */
 627                 if (errno != ENOENT && errno != ENOTDIR) {
 628                         name = dptr->wcard;
 629                         goto clean;
 630                 }
 631         }
 632
 633         /* Stat failed. We know this is authoratiative if we are
 634          * providing case sensitive semantics or the underlying
 635          * filesystem is case sensitive.
 636          */
 637         if (dptr->conn->case_sensitive ||
 638             !(dptr->conn->fs_capabilities & FILE_CASE_SENSITIVE_SEARCH))
 639         {
 640                 goto clean;
 641         }
 642
 643         TALLOC_FREE(pathreal);
 644
 645         return dptr_normal_ReadDirName(dptr, poffset, pst);
 646
 647 clean:
 648         TALLOC_FREE(pathreal);
 649 ret:
 650         /* We need to set the underlying dir_hnd offset to -1
 651          * also as this function is usually called with the
 652          * output from TellDir. */
 653         dptr->dir_hnd->offset = *poffset = END_OF_DIRECTORY_OFFSET;
 654         return name;
 655 }
 656
 657 /****************************************************************************
 658  Search for a file by name, skipping veto'ed and not visible files.
 659 ****************************************************************************/
 660
 661 bool dptr_SearchDir(struct dptr_struct *dptr, const char *name, long *poffset, SMB_STRUCT_STAT *pst)
 662 {
 663         SET_STAT_INVALID(*pst);
 664
 665         if (!dptr->has_wild && (dptr->dir_hnd->offset == END_OF_DIRECTORY_OFFSET)) {
 666                 /* This is a singleton directory and we're already at the end. */
 667                 *poffset = END_OF_DIRECTORY_OFFSET;
 668                 return False;
 669         }
 670
 671         return SearchDir(dptr->dir_hnd, name, poffset);
 672 }
 673
 674 /****************************************************************************
 675  Add the name we're returning into the underlying cache.
 676 ****************************************************************************/
 677
 678 void dptr_DirCacheAdd(struct dptr_struct *dptr, const char *name, long offset)
 679 {
 680         DirCacheAdd(dptr->dir_hnd, name, offset);
 681 }
 682
 683 /****************************************************************************
 684  Fill the 5 byte server reserved dptr field.
 685 ****************************************************************************/
 686
 687 bool dptr_fill(char *buf1,unsigned int key)
 688 {
 689         unsigned char *buf = (unsigned char *)buf1;
 690         struct dptr_struct *dptr = dptr_get(key, False);
 691         uint32 offset;
 692         if (!dptr) {
 693                 DEBUG(1,("filling null dirptr %d\n",key));
 694                 return(False);
 695         }
 696         offset = (uint32)TellDir(dptr->dir_hnd);
 697         DEBUG(6,("fill on key %u dirptr 0x%lx now at %d\n",key,
 698                 (long)dptr->dir_hnd,(int)offset));
 699         buf[0] = key;
 700         SIVAL(buf,1,offset);
 701         return(True);
 702 }
 703
 704 /****************************************************************************
 705  Fetch the dir ptr and seek it given the 5 byte server field.
 706 ****************************************************************************/
 707
 708 struct dptr_struct *dptr_fetch(char *buf,int *num)
 709 {
 710         unsigned int key = *(unsigned char *)buf;
 711         struct dptr_struct *dptr = dptr_get(key, False);
 712         uint32 offset;
 713         long seekoff;
 714
 715         if (!dptr) {
 716                 DEBUG(3,("fetched null dirptr %d\n",key));
 717                 return(NULL);
 718         }
 719         *num = key;
 720         offset = IVAL(buf,1);
 721         if (offset == (uint32)-1) {
 722                 seekoff = END_OF_DIRECTORY_OFFSET;
 723         } else {
 724                 seekoff = (long)offset;
 725         }
 726         SeekDir(dptr->dir_hnd,seekoff);
 727         DEBUG(3,("fetching dirptr %d for path %s at offset %d\n",
 728                 key,dptr_path(key),(int)seekoff));
 729         return(dptr);
 730 }
 731
 732 /****************************************************************************
 733  Fetch the dir ptr.
 734 ****************************************************************************/
 735
 736 struct dptr_struct *dptr_fetch_lanman2(int dptr_num)
 737 {
 738         struct dptr_struct *dptr  = dptr_get(dptr_num, False);
 739
 740         if (!dptr) {
 741                 DEBUG(3,("fetched null dirptr %d\n",dptr_num));
 742                 return(NULL);
 743         }
 744         DEBUG(3,("fetching dirptr %d for path %s\n",dptr_num,dptr_path(dptr_num)));
 745         return(dptr);
 746 }
 747
 748 /****************************************************************************
 749  Check that a file matches a particular file type.
 750 ****************************************************************************/
 751
 752 bool dir_check_ftype(connection_struct *conn, uint32 mode, uint32 dirtype)
 753 {
 754         uint32 mask;
 755
 756         /* Check the "may have" search bits. */
 757         if (((mode & ~dirtype) & (aHIDDEN | aSYSTEM | aDIR)) != 0)
 758                 return False;
 759
 760         /* Check the "must have" bits, which are the may have bits shifted eight */
 761         /* If must have bit is set, the file/dir can not be returned in search unless the matching
 762                 file attribute is set */
 763         mask = ((dirtype >> 8) & (aDIR|aARCH|aRONLY|aHIDDEN|aSYSTEM)); /* & 0x37 */
 764         if(mask) {
 765                 if((mask & (mode & (aDIR|aARCH|aRONLY|aHIDDEN|aSYSTEM))) == mask)   /* check if matching attribute present */
 766                         return True;
 767                 else
 768                         return False;
 769         }
 770
 771         return True;
 772 }
 773
 774 static bool mangle_mask_match(connection_struct *conn,
 775                 const char *filename,
 776                 const char *mask)
 777 {
 778         char mname[13];
 779
 780         if (!name_to_8_3(filename,mname,False,conn->params)) {
 781                 return False;
 782         }
 783         return mask_match_search(mname,mask,False);
 784 }
 785
 786 /****************************************************************************
 787  Get an 8.3 directory entry.
 788 ****************************************************************************/
 789
 790 bool get_dir_entry(TALLOC_CTX *ctx,
 791                 connection_struct *conn,
 792                 const char *mask,
 793                 uint32 dirtype,
 794                 char **pp_fname_out,
 795                 SMB_OFF_T *size,
 796                 uint32 *mode,
 797                 time_t *date,
 798                 bool check_descend,
 799                 bool ask_sharemode)
 800 {
 801         const char *dname = NULL;
 802         bool found = False;
 803         SMB_STRUCT_STAT sbuf;
 804         char *pathreal = NULL;
 805         const char *filename = NULL;
 806         bool needslash;
 807
 808         *pp_fname_out = NULL;
 809
 810         needslash = ( conn->dirpath[strlen(conn->dirpath) -1] != '/');
 811
 812         if (!conn->dirptr) {
 813                 return(False);
 814         }
 815
 816         while (!found) {
 817                 long curoff = dptr_TellDir(conn->dirptr);
 818                 dname = dptr_ReadDirName(ctx, conn->dirptr, &curoff, &sbuf);
 819
 820                 DEBUG(6,("readdir on dirptr 0x%lx now at offset %ld\n",
 821                         (long)conn->dirptr,TellDir(conn->dirptr->dir_hnd)));
 822
 823                 if (dname == NULL) {
 824                         return(False);
 825                 }
 826
 827                 filename = dname;
 828
 829                 /* notice the special *.* handling. This appears to be the only difference
 830                         between the wildcard handling in this routine and in the trans2 routines.
 831                         see masktest for a demo
 832                 */
 833                 if ((strcmp(mask,"*.*") == 0) ||
 834                     mask_match_search(filename,mask,False) ||
 835                     mangle_mask_match(conn,filename,mask)) {
 836                         char mname[13];
 837
 838                         if (!mangle_is_8_3(filename, False, conn->params)) {
 839                                 if (!name_to_8_3(filename,mname,False,
 840                                            conn->params)) {
 841                                         continue;
 842                                 }
 843                                 filename = mname;
 844                         }
 845
 846                         if (needslash) {
 847                                 pathreal = talloc_asprintf(ctx,
 848                                                 "%s/%s",
 849                                                 conn->dirpath,
 850                                                 dname);
 851                         } else {
 852                                 pathreal = talloc_asprintf(ctx,
 853                                                 "%s%s",
 854                                                 conn->dirpath,
 855                                                 dname);
 856                         }
 857                         if (!pathreal) {
 858                                 return False;
 859                         }
 860
 861                         if (!VALID_STAT(sbuf) && (SMB_VFS_STAT(conn, pathreal, &sbuf)) != 0) {
 862                                 DEBUG(5,("Couldn't stat 1 [%s]. Error = %s\n",
 863                                         pathreal, strerror(errno) ));
 864                                 TALLOC_FREE(pathreal);
 865                                 continue;
 866                         }
 867
 868                         *mode = dos_mode(conn,pathreal,&sbuf);
 869
 870                         if (!dir_check_ftype(conn,*mode,dirtype)) {
 871                                 DEBUG(5,("[%s] attribs 0x%x didn't match 0x%x\n",filename,(unsigned int)*mode,(unsigned int)dirtype));
 872                                 TALLOC_FREE(pathreal);
 873                                 continue;
 874                         }
 875
 876                         *size = sbuf.st_size;
 877                         *date = sbuf.st_mtime;
 878
 879                         if (ask_sharemode) {
 880                                 struct timespec write_time_ts;
 881                                 struct file_id fileid;
 882
 883                                 fileid = vfs_file_id_from_sbuf(conn, &sbuf);
 884                                 get_file_infos(fileid, NULL, &write_time_ts);
 885                                 if (!null_timespec(write_time_ts)) {
 886                                         *date = convert_timespec_to_time_t(write_time_ts);
 887                                 }
 888                         }
 889
 890                         DEBUG(3,("get_dir_entry mask=[%s] found %s "
 891                                 "fname=%s (%s)\n",
 892                                 mask,
 893                                 pathreal,
 894                                 dname,
 895                                 filename));
 896
 897                         found = True;
 898
 899                         *pp_fname_out = talloc_strdup(ctx, filename);
 900                         if (!*pp_fname_out) {
 901                                 return False;
 902                         }
 903
 904                         DirCacheAdd(conn->dirptr->dir_hnd, dname, curoff);
 905                         TALLOC_FREE(pathreal);
 906                 }
 907         }
 908
 909         return(found);
 910 }
 911
 912 /*******************************************************************
 913  Check to see if a user can read a file. This is only approximate,
 914  it is used as part of the "hide unreadable" option. Don't
 915  use it for anything security sensitive.
 916 ********************************************************************/
 917
 918 static bool user_can_read_file(connection_struct *conn, char *name)
 919 {
 920         /*
 921          * If user is a member of the Admin group
 922          * we never hide files from them.
 923          */
 924
 925         if (conn->admin_user) {
 926                 return True;
 927         }
 928
 929         return can_access_file_acl(conn, name, FILE_READ_DATA);
 930 }
 931
 932 /*******************************************************************
 933  Check to see if a user can write a file (and only files, we do not
 934  check dirs on this one). This is only approximate,
 935  it is used as part of the "hide unwriteable" option. Don't
 936  use it for anything security sensitive.
 937 ********************************************************************/
 938
 939 static bool user_can_write_file(connection_struct *conn, char *name, SMB_STRUCT_STAT *pst)
 940 {
 941         /*
 942          * If user is a member of the Admin group
 943          * we never hide files from them.
 944          */
 945
 946         if (conn->admin_user) {
 947                 return True;
 948         }
 949
 950         SMB_ASSERT(VALID_STAT(*pst));
 951
 952         /* Pseudo-open the file */
 953
 954         if(S_ISDIR(pst->st_mode)) {
 955                 return True;
 956         }
 957
 958         return can_write_to_file(conn, name, pst);
 959 }
 960
 961 /*******************************************************************
 962   Is a file a "special" type ?
 963 ********************************************************************/
 964
 965 static bool file_is_special(connection_struct *conn, char *name, SMB_STRUCT_STAT *pst)
 966 {
 967         /*
 968          * If user is a member of the Admin group
 969          * we never hide files from them.
 970          */
 971
 972         if (conn->admin_user)
 973                 return False;
 974
 975         SMB_ASSERT(VALID_STAT(*pst));
 976
 977         if (S_ISREG(pst->st_mode) || S_ISDIR(pst->st_mode) || S_ISLNK(pst->st_mode))
 978                 return False;
 979
 980         return True;
 981 }
 982
 983 /*******************************************************************
 984  Should the file be seen by the client?
 985  NOTE: A successful return is no guarantee of the file's existence.
 986 ********************************************************************/
 987
 988 bool is_visible_file(connection_struct *conn, const char *dir_path,
 989                      const char *name, SMB_STRUCT_STAT *pst, bool use_veto)
 990 {
 991         bool hide_unreadable = lp_hideunreadable(SNUM(conn));
 992         bool hide_unwriteable = lp_hideunwriteable_files(SNUM(conn));
 993         bool hide_special = lp_hide_special_files(SNUM(conn));
 994
 995         if ((strcmp(".",name) == 0) || (strcmp("..",name) == 0)) {
 996                 return True; /* . and .. are always visible. */
 997         }
 998
 999         /* If it's a vetoed file, pretend it doesn't even exist */
1000         if (use_veto && IS_VETO_PATH(conn, name)) {
1001                 DEBUG(10,("is_visible_file: file %s is vetoed.\n", name ));
1002                 return False;
1003         }
1004
1005         if (hide_unreadable || hide_unwriteable || hide_special) {
1006                 char *entry = NULL;
1007
1008                 if (asprintf(&entry, "%s/%s", dir_path, name) == -1) {
1009                         return False;
1010                 }
1011
1012                 /* If it's a dfs symlink, ignore _hide xxxx_ options */
1013                 if (lp_host_msdfs() &&
1014                                 lp_msdfs_root(SNUM(conn)) &&
1015                                 is_msdfs_link(conn, entry, NULL)) {
1016                         SAFE_FREE(entry);
1017                         return True;
1018                 }
1019
1020                 /* If the file name does not exist, there's no point checking
1021                  * the configuration options. We succeed, on the basis that the
1022                  * checks *might* have passed if the file was present.
1023                  */
1024                 if (!VALID_STAT(*pst) && (SMB_VFS_STAT(conn, entry, pst) != 0))
1025                 {
1026                         SAFE_FREE(entry);
1027                         return True;
1028                 }
1029
1030                 /* Honour _hide unreadable_ option */
1031                 if (hide_unreadable && !user_can_read_file(conn, entry)) {
1032                         DEBUG(10,("is_visible_file: file %s is unreadable.\n",
1033                                  entry ));
1034                         SAFE_FREE(entry);
1035                         return False;
1036                 }
1037                 /* Honour _hide unwriteable_ option */
1038                 if (hide_unwriteable && !user_can_write_file(conn, entry, pst)) {
1039                         DEBUG(10,("is_visible_file: file %s is unwritable.\n",
1040                                  entry ));
1041                         SAFE_FREE(entry);
1042                         return False;
1043                 }
1044                 /* Honour _hide_special_ option */
1045                 if (hide_special && file_is_special(conn, entry, pst)) {
1046                         DEBUG(10,("is_visible_file: file %s is special.\n",
1047                                  entry ));
1048                         SAFE_FREE(entry);
1049                         return False;
1050                 }
1051                 SAFE_FREE(entry);
1052         }
1053         return True;
1054 }
1055
1056 static int smb_Dir_destructor(struct smb_Dir *dirp)
1057 {
1058         if (dirp->dir) {
1059                 SMB_VFS_CLOSEDIR(dirp->conn,dirp->dir);
1060         }
1061         dirhandles_open--;
1062         return 0;
1063 }
1064
1065 /*******************************************************************
1066  Open a directory.
1067 ********************************************************************/
1068
1069 struct smb_Dir *OpenDir(TALLOC_CTX *mem_ctx, connection_struct *conn,
1070                         const char *name, const char *mask, uint32 attr)
1071 {
1072         struct smb_Dir *dirp = TALLOC_ZERO_P(mem_ctx, struct smb_Dir);
1073
1074         if (!dirp) {
1075                 return NULL;
1076         }
1077
1078         dirp->conn = conn;
1079         dirp->name_cache_size = lp_directory_name_cache_size(SNUM(conn));
1080
1081         dirp->dir_path = talloc_strdup(dirp, name);
1082         if (!dirp->dir_path) {
1083                 errno = ENOMEM;
1084                 goto fail;
1085         }
1086
1087         dirhandles_open++;
1088         talloc_set_destructor(dirp, smb_Dir_destructor);
1089
1090         dirp->dir = SMB_VFS_OPENDIR(conn, dirp->dir_path, mask, attr);
1091         if (!dirp->dir) {
1092                 DEBUG(5,("OpenDir: Can't open %s. %s\n", dirp->dir_path,
1093                          strerror(errno) ));
1094                 goto fail;
1095         }
1096
1097         return dirp;
1098
1099   fail:
1100         TALLOC_FREE(dirp);
1101         return NULL;
1102 }
1103
1104 /*******************************************************************
1105  Read from a directory.
1106  Return directory entry, current offset, and optional stat information.
1107  Don't check for veto or invisible files.
1108 ********************************************************************/
1109
1110 const char *ReadDirName(struct smb_Dir *dirp, long *poffset,
1111                         SMB_STRUCT_STAT *sbuf)
1112 {
1113         const char *n;
1114         connection_struct *conn = dirp->conn;
1115
1116         /* Cheat to allow . and .. to be the first entries returned. */
1117         if (((*poffset == START_OF_DIRECTORY_OFFSET) ||
1118              (*poffset == DOT_DOT_DIRECTORY_OFFSET)) && (dirp->file_number < 2))
1119         {
1120                 if (dirp->file_number == 0) {
1121                         n = ".";
1122                         *poffset = dirp->offset = START_OF_DIRECTORY_OFFSET;
1123                 } else {
1124                         *poffset = dirp->offset = DOT_DOT_DIRECTORY_OFFSET;
1125                         n = "..";
1126                 }
1127                 dirp->file_number++;
1128                 return n;
1129         } else if (*poffset == END_OF_DIRECTORY_OFFSET) {
1130                 *poffset = dirp->offset = END_OF_DIRECTORY_OFFSET;
1131                 return NULL;
1132         } else {
1133                 /* A real offset, seek to it. */
1134                 SeekDir(dirp, *poffset);
1135         }
1136
1137         while ((n = vfs_readdirname(conn, dirp->dir, sbuf))) {
1138                 /* Ignore . and .. - we've already returned them. */
1139                 if (*n == '.') {
1140                         if ((n[1] == '\0') || (n[1] == '.' && n[2] == '\0')) {
1141                                 continue;
1142                         }
1143                 }
1144                 *poffset = dirp->offset = SMB_VFS_TELLDIR(conn, dirp->dir);
1145                 dirp->file_number++;
1146                 return n;
1147         }
1148         *poffset = dirp->offset = END_OF_DIRECTORY_OFFSET;
1149         return NULL;
1150 }
1151
1152 /*******************************************************************
1153  Rewind to the start.
1154 ********************************************************************/
1155
1156 void RewindDir(struct smb_Dir *dirp, long *poffset)
1157 {
1158         SMB_VFS_REWINDDIR(dirp->conn, dirp->dir);
1159         dirp->file_number = 0;
1160         dirp->offset = START_OF_DIRECTORY_OFFSET;
1161         *poffset = START_OF_DIRECTORY_OFFSET;
1162 }
1163
1164 /*******************************************************************
1165  Seek a dir.
1166 ********************************************************************/
1167
1168 void SeekDir(struct smb_Dir *dirp, long offset)
1169 {
1170         if (offset != dirp->offset) {
1171                 if (offset == START_OF_DIRECTORY_OFFSET) {
1172                         RewindDir(dirp, &offset);
1173                         /*
1174                          * Ok we should really set the file number here
1175                          * to 1 to enable ".." to be returned next. Trouble
1176                          * is I'm worried about callers using SeekDir(dirp,0)
1177                          * as equivalent to RewindDir(). So leave this alone
1178                          * for now.
1179                          */
1180                 } else if  (offset == DOT_DOT_DIRECTORY_OFFSET) {
1181                         RewindDir(dirp, &offset);
1182                         /*
1183                          * Set the file number to 2 - we want to get the first
1184                          * real file entry (the one we return after "..")
1185                          * on the next ReadDir.
1186                          */
1187                         dirp->file_number = 2;
1188                 } else if (offset == END_OF_DIRECTORY_OFFSET) {
1189                         ; /* Don't seek in this case. */
1190                 } else {
1191                         SMB_VFS_SEEKDIR(dirp->conn, dirp->dir, offset);
1192                 }
1193                 dirp->offset = offset;
1194         }
1195 }
1196
1197 /*******************************************************************
1198  Tell a dir position.
1199 ********************************************************************/
1200
1201 long TellDir(struct smb_Dir *dirp)
1202 {
1203         return(dirp->offset);
1204 }
1205
1206 /*******************************************************************
1207  Add an entry into the dcache.
1208 ********************************************************************/
1209
1210 void DirCacheAdd(struct smb_Dir *dirp, const char *name, long offset)
1211 {
1212         struct name_cache_entry *e;
1213
1214         if (dirp->name_cache_size == 0) {
1215                 return;
1216         }
1217
1218         if (dirp->name_cache == NULL) {
1219                 dirp->name_cache = TALLOC_ZERO_ARRAY(
1220                         dirp, struct name_cache_entry, dirp->name_cache_size);
1221
1222                 if (dirp->name_cache == NULL) {
1223                         return;
1224                 }
1225         }
1226
1227         dirp->name_cache_index = (dirp->name_cache_index+1) %
1228                                         dirp->name_cache_size;
1229         e = &dirp->name_cache[dirp->name_cache_index];
1230         TALLOC_FREE(e->name);
1231         e->name = talloc_strdup(dirp, name);
1232         e->offset = offset;
1233 }
1234
1235 /*******************************************************************
1236  Find an entry by name. Leave us at the offset after it.
1237  Don't check for veto or invisible files.
1238 ********************************************************************/
1239
1240 bool SearchDir(struct smb_Dir *dirp, const char *name, long *poffset)
1241 {
1242         int i;
1243         const char *entry;
1244         connection_struct *conn = dirp->conn;
1245
1246         /* Search back in the name cache. */
1247         if (dirp->name_cache_size && dirp->name_cache) {
1248                 for (i = dirp->name_cache_index; i >= 0; i--) {
1249                         struct name_cache_entry *e = &dirp->name_cache[i];
1250                         if (e->name && (conn->case_sensitive ? (strcmp(e->name, name) == 0) : strequal(e->name, name))) {
1251                                 *poffset = e->offset;
1252                                 SeekDir(dirp, e->offset);
1253                                 return True;
1254                         }
1255                 }
1256                 for (i = dirp->name_cache_size - 1; i > dirp->name_cache_index; i--) {
1257                         struct name_cache_entry *e = &dirp->name_cache[i];
1258                         if (e->name && (conn->case_sensitive ? (strcmp(e->name, name) == 0) : strequal(e->name, name))) {
1259                                 *poffset = e->offset;
1260                                 SeekDir(dirp, e->offset);
1261                                 return True;
1262                         }
1263                 }
1264         }
1265
1266         /* Not found in the name cache. Rewind directory and start from scratch. */
1267         SMB_VFS_REWINDDIR(conn, dirp->dir);
1268         dirp->file_number = 0;
1269         *poffset = START_OF_DIRECTORY_OFFSET;
1270         while ((entry = ReadDirName(dirp, poffset, NULL))) {
1271                 if (conn->case_sensitive ? (strcmp(entry, name) == 0) : strequal(entry, name)) {
1272                         return True;
1273                 }
1274         }
1275         return False;
1276 }
1277
1278 /*****************************************************************
1279  Is this directory empty ?
1280 *****************************************************************/
1281
1282 NTSTATUS can_delete_directory(struct connection_struct *conn,
1283                                 const char *dirname)
1284 {
1285         NTSTATUS status = NT_STATUS_OK;
1286         long dirpos = 0;
1287         const char *dname;
1288         SMB_STRUCT_STAT st;
1289         struct smb_Dir *dir_hnd = OpenDir(talloc_tos(), conn, dirname,
1290                                           NULL, 0);
1291
1292         if (!dir_hnd) {
1293                 return map_nt_error_from_unix(errno);
1294         }
1295
1296         while ((dname = ReadDirName(dir_hnd, &dirpos, &st))) {
1297                 /* Quick check for "." and ".." */
1298                 if (dname[0] == '.') {
1299                         if (!dname[1] || (dname[1] == '.' && !dname[2])) {
1300                                 continue;
1301                         }
1302                 }
1303
1304                 if (!is_visible_file(conn, dirname, dname, &st, True)) {
1305                         continue;
1306                 }
1307
1308                 DEBUG(10,("can_delete_directory: got name %s - can't delete\n",
1309                          dname ));
1310                 status = NT_STATUS_DIRECTORY_NOT_EMPTY;
1311                 break;
1312         }
1313         TALLOC_FREE(dir_hnd);
1314
1315         return status;
1316 }