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 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         char *found_name = NULL;
 580         int ret;
 581         const char *name_temp = NULL;
 582
 583         SET_STAT_INVALID(*pst);
 584
 585         if (dptr->has_wild || dptr->did_stat) {
 586                 name_temp = dptr_normal_ReadDirName(dptr, poffset, pst);
 587                 name = talloc_strdup(ctx, name_temp);
 588                 return name;
 589         }
 590
 591         /* If poffset is -1 then we know we returned this name before and we
 592          * have no wildcards. We're at the end of the directory. */
 593         if (*poffset == END_OF_DIRECTORY_OFFSET) {
 594                 return NULL;
 595         }
 596
 597         /* We know the stored wcard contains no wildcard characters.
 598          * See if we can match with a stat call. If we can't, then set
 599          * did_stat to true to ensure we only do this once and keep
 600          * searching. */
 601
 602         dptr->did_stat = true;
 603
 604         /* First check if it should be visible. */
 605         if (!is_visible_file(dptr->conn, dptr->path, dptr->wcard,
 606             pst, true))
 607         {
 608                 /* This only returns false if the file was found, but
 609                    is explicitly not visible. Set us to end of
 610                    directory, but return NULL as we know we can't ever
 611                    find it. */
 612                 goto ret;
 613         }
 614
 615         if (VALID_STAT(*pst)) {
 616                 name = talloc_strdup(ctx, dptr->wcard);
 617                 goto ret;
 618         }
 619
 620         pathreal = talloc_asprintf(ctx,
 621                                 "%s/%s",
 622                                 dptr->path,
 623                                 dptr->wcard);
 624         if (!pathreal)
 625                 return NULL;
 626
 627         if (SMB_VFS_STAT(dptr->conn, pathreal, pst) == 0) {
 628                 name = talloc_strdup(ctx, dptr->wcard);
 629                 goto clean;
 630         } else {
 631                 /* If we get any other error than ENOENT or ENOTDIR
 632                    then the file exists we just can't stat it. */
 633                 if (errno != ENOENT && errno != ENOTDIR) {
 634                         name = talloc_strdup(ctx, dptr->wcard);
 635                         goto clean;
 636                 }
 637         }
 638
 639         /* Stat failed. We know this is authoratiative if we are
 640          * providing case sensitive semantics or the underlying
 641          * filesystem is case sensitive.
 642          */
 643         if (dptr->conn->case_sensitive ||
 644             !(dptr->conn->fs_capabilities & FILE_CASE_SENSITIVE_SEARCH))
 645         {
 646                 goto clean;
 647         }
 648
 649         /*
 650          * Try case-insensitive stat if the fs has the ability. This avoids
 651          * scanning the whole directory.
 652          */
 653         ret = SMB_VFS_GET_REAL_FILENAME(dptr->conn, dptr->path, dptr->wcard,
 654                                         ctx, &found_name);
 655         if (ret == 0) {
 656                 name = found_name;
 657                 goto clean;
 658         } else if (errno == ENOENT) {
 659                 /* The case-insensitive lookup was authoritative. */
 660                 goto clean;
 661         }
 662
 663         TALLOC_FREE(pathreal);
 664
 665         name_temp = dptr_normal_ReadDirName(dptr, poffset, pst);
 666         name = talloc_strdup(ctx, name_temp);
 667         return name;
 668
 669 clean:
 670         TALLOC_FREE(pathreal);
 671 ret:
 672         /* We need to set the underlying dir_hnd offset to -1
 673          * also as this function is usually called with the
 674          * output from TellDir. */
 675         dptr->dir_hnd->offset = *poffset = END_OF_DIRECTORY_OFFSET;
 676         return name;
 677 }
 678
 679 /****************************************************************************
 680  Search for a file by name, skipping veto'ed and not visible files.
 681 ****************************************************************************/
 682
 683 bool dptr_SearchDir(struct dptr_struct *dptr, const char *name, long *poffset, SMB_STRUCT_STAT *pst)
 684 {
 685         SET_STAT_INVALID(*pst);
 686
 687         if (!dptr->has_wild && (dptr->dir_hnd->offset == END_OF_DIRECTORY_OFFSET)) {
 688                 /* This is a singleton directory and we're already at the end. */
 689                 *poffset = END_OF_DIRECTORY_OFFSET;
 690                 return False;
 691         }
 692
 693         return SearchDir(dptr->dir_hnd, name, poffset);
 694 }
 695
 696 /****************************************************************************
 697  Add the name we're returning into the underlying cache.
 698 ****************************************************************************/
 699
 700 void dptr_DirCacheAdd(struct dptr_struct *dptr, const char *name, long offset)
 701 {
 702         DirCacheAdd(dptr->dir_hnd, name, offset);
 703 }
 704
 705 /****************************************************************************
 706  Initialize variables & state data at the beginning of all search SMB requests.
 707 ****************************************************************************/
 708 void dptr_init_search_op(struct dptr_struct *dptr)
 709 {
 710         SMB_VFS_INIT_SEARCH_OP(dptr->conn, dptr->dir_hnd->dir);
 711 }
 712
 713 /****************************************************************************
 714  Fill the 5 byte server reserved dptr field.
 715 ****************************************************************************/
 716
 717 bool dptr_fill(char *buf1,unsigned int key)
 718 {
 719         unsigned char *buf = (unsigned char *)buf1;
 720         struct dptr_struct *dptr = dptr_get(key, False);
 721         uint32 offset;
 722         if (!dptr) {
 723                 DEBUG(1,("filling null dirptr %d\n",key));
 724                 return(False);
 725         }
 726         offset = (uint32)TellDir(dptr->dir_hnd);
 727         DEBUG(6,("fill on key %u dirptr 0x%lx now at %d\n",key,
 728                 (long)dptr->dir_hnd,(int)offset));
 729         buf[0] = key;
 730         SIVAL(buf,1,offset);
 731         return(True);
 732 }
 733
 734 /****************************************************************************
 735  Fetch the dir ptr and seek it given the 5 byte server field.
 736 ****************************************************************************/
 737
 738 struct dptr_struct *dptr_fetch(char *buf,int *num)
 739 {
 740         unsigned int key = *(unsigned char *)buf;
 741         struct dptr_struct *dptr = dptr_get(key, False);
 742         uint32 offset;
 743         long seekoff;
 744
 745         if (!dptr) {
 746                 DEBUG(3,("fetched null dirptr %d\n",key));
 747                 return(NULL);
 748         }
 749         *num = key;
 750         offset = IVAL(buf,1);
 751         if (offset == (uint32)-1) {
 752                 seekoff = END_OF_DIRECTORY_OFFSET;
 753         } else {
 754                 seekoff = (long)offset;
 755         }
 756         SeekDir(dptr->dir_hnd,seekoff);
 757         DEBUG(3,("fetching dirptr %d for path %s at offset %d\n",
 758                 key,dptr_path(key),(int)seekoff));
 759         return(dptr);
 760 }
 761
 762 /****************************************************************************
 763  Fetch the dir ptr.
 764 ****************************************************************************/
 765
 766 struct dptr_struct *dptr_fetch_lanman2(int dptr_num)
 767 {
 768         struct dptr_struct *dptr  = dptr_get(dptr_num, False);
 769
 770         if (!dptr) {
 771                 DEBUG(3,("fetched null dirptr %d\n",dptr_num));
 772                 return(NULL);
 773         }
 774         DEBUG(3,("fetching dirptr %d for path %s\n",dptr_num,dptr_path(dptr_num)));
 775         return(dptr);
 776 }
 777
 778 /****************************************************************************
 779  Check that a file matches a particular file type.
 780 ****************************************************************************/
 781
 782 bool dir_check_ftype(connection_struct *conn, uint32 mode, uint32 dirtype)
 783 {
 784         uint32 mask;
 785
 786         /* Check the "may have" search bits. */
 787         if (((mode & ~dirtype) & (aHIDDEN | aSYSTEM | aDIR)) != 0)
 788                 return False;
 789
 790         /* Check the "must have" bits, which are the may have bits shifted eight */
 791         /* If must have bit is set, the file/dir can not be returned in search unless the matching
 792                 file attribute is set */
 793         mask = ((dirtype >> 8) & (aDIR|aARCH|aRONLY|aHIDDEN|aSYSTEM)); /* & 0x37 */
 794         if(mask) {
 795                 if((mask & (mode & (aDIR|aARCH|aRONLY|aHIDDEN|aSYSTEM))) == mask)   /* check if matching attribute present */
 796                         return True;
 797                 else
 798                         return False;
 799         }
 800
 801         return True;
 802 }
 803
 804 static bool mangle_mask_match(connection_struct *conn,
 805                 const char *filename,
 806                 const char *mask)
 807 {
 808         char mname[13];
 809
 810         if (!name_to_8_3(filename,mname,False,conn->params)) {
 811                 return False;
 812         }
 813         return mask_match_search(mname,mask,False);
 814 }
 815
 816 /****************************************************************************
 817  Get an 8.3 directory entry.
 818 ****************************************************************************/
 819
 820 bool get_dir_entry(TALLOC_CTX *ctx,
 821                 connection_struct *conn,
 822                 const char *mask,
 823                 uint32 dirtype,
 824                 char **pp_fname_out,
 825                 SMB_OFF_T *size,
 826                 uint32 *mode,
 827                 struct timespec *date,
 828                 bool check_descend,
 829                 bool ask_sharemode)
 830 {
 831         char *dname = NULL;
 832         bool found = False;
 833         SMB_STRUCT_STAT sbuf;
 834         char *pathreal = NULL;
 835         char *filename = NULL;
 836         bool needslash;
 837
 838         *pp_fname_out = NULL;
 839
 840         needslash = ( conn->dirpath[strlen(conn->dirpath) -1] != '/');
 841
 842         if (!conn->dirptr) {
 843                 return(False);
 844         }
 845
 846         while (!found) {
 847                 long curoff = dptr_TellDir(conn->dirptr);
 848                 dname = dptr_ReadDirName(ctx, conn->dirptr, &curoff, &sbuf);
 849
 850                 DEBUG(6,("readdir on dirptr 0x%lx now at offset %ld\n",
 851                         (long)conn->dirptr,TellDir(conn->dirptr->dir_hnd)));
 852
 853                 if (dname == NULL) {
 854                         return(False);
 855                 }
 856
 857                 filename = dname;
 858
 859                 /* notice the special *.* handling. This appears to be the only difference
 860                         between the wildcard handling in this routine and in the trans2 routines.
 861                         see masktest for a demo
 862                 */
 863                 if ((strcmp(mask,"*.*") == 0) ||
 864                     mask_match_search(filename,mask,False) ||
 865                     mangle_mask_match(conn,filename,mask)) {
 866                         char mname[13];
 867
 868                         if (!mangle_is_8_3(filename, False, conn->params)) {
 869                                 if (!name_to_8_3(filename,mname,False,
 870                                            conn->params)) {
 871                                         TALLOC_FREE(filename);
 872                                         continue;
 873                                 }
 874                                 filename = talloc_strdup(ctx, mname);
 875                                 if (!filename) {
 876                                         return False;
 877                                 }
 878                         }
 879
 880                         if (needslash) {
 881                                 pathreal = talloc_asprintf(ctx,
 882                                                 "%s/%s",
 883                                                 conn->dirpath,
 884                                                 dname);
 885                         } else {
 886                                 pathreal = talloc_asprintf(ctx,
 887                                                 "%s%s",
 888                                                 conn->dirpath,
 889                                                 dname);
 890                         }
 891                         if (!pathreal) {
 892                                 TALLOC_FREE(filename);
 893                                 return False;
 894                         }
 895
 896                         if (!VALID_STAT(sbuf) && (SMB_VFS_STAT(conn, pathreal, &sbuf)) != 0) {
 897                                 DEBUG(5,("Couldn't stat 1 [%s]. Error = %s\n",
 898                                         pathreal, strerror(errno) ));
 899                                 TALLOC_FREE(pathreal);
 900                                 TALLOC_FREE(filename);
 901                                 continue;
 902                         }
 903
 904                         *mode = dos_mode(conn,pathreal,&sbuf);
 905
 906                         if (!dir_check_ftype(conn,*mode,dirtype)) {
 907                                 DEBUG(5,("[%s] attribs 0x%x didn't match 0x%x\n",filename,(unsigned int)*mode,(unsigned int)dirtype));
 908                                 TALLOC_FREE(pathreal);
 909                                 TALLOC_FREE(filename);
 910                                 continue;
 911                         }
 912
 913                         *size = sbuf.st_ex_size;
 914                         *date = sbuf.st_ex_mtime;
 915
 916                         if (ask_sharemode) {
 917                                 struct timespec write_time_ts;
 918                                 struct file_id fileid;
 919
 920                                 fileid = vfs_file_id_from_sbuf(conn, &sbuf);
 921                                 get_file_infos(fileid, NULL, &write_time_ts);
 922                                 if (!null_timespec(write_time_ts)) {
 923                                         *date = write_time_ts;
 924                                 }
 925                         }
 926
 927                         DEBUG(3,("get_dir_entry mask=[%s] found %s "
 928                                 "fname=%s (%s)\n",
 929                                 mask,
 930                                 pathreal,
 931                                 dname,
 932                                 filename));
 933
 934                         found = True;
 935
 936                         SMB_ASSERT(filename != NULL);
 937                         *pp_fname_out = filename;
 938
 939                         DirCacheAdd(conn->dirptr->dir_hnd, dname, curoff);
 940                         TALLOC_FREE(pathreal);
 941                 }
 942
 943                 if (!found)
 944                         TALLOC_FREE(filename);
 945         }
 946
 947         return(found);
 948 }
 949
 950 /*******************************************************************
 951  Check to see if a user can read a file. This is only approximate,
 952  it is used as part of the "hide unreadable" option. Don't
 953  use it for anything security sensitive.
 954 ********************************************************************/
 955
 956 static bool user_can_read_file(connection_struct *conn, char *name)
 957 {
 958         /*
 959          * If user is a member of the Admin group
 960          * we never hide files from them.
 961          */
 962
 963         if (conn->admin_user) {
 964                 return True;
 965         }
 966
 967         return can_access_file_acl(conn, name, FILE_READ_DATA);
 968 }
 969
 970 /*******************************************************************
 971  Check to see if a user can write a file (and only files, we do not
 972  check dirs on this one). This is only approximate,
 973  it is used as part of the "hide unwriteable" option. Don't
 974  use it for anything security sensitive.
 975 ********************************************************************/
 976
 977 static bool user_can_write_file(connection_struct *conn, char *name, SMB_STRUCT_STAT *pst)
 978 {
 979         /*
 980          * If user is a member of the Admin group
 981          * we never hide files from them.
 982          */
 983
 984         if (conn->admin_user) {
 985                 return True;
 986         }
 987
 988         SMB_ASSERT(VALID_STAT(*pst));
 989
 990         /* Pseudo-open the file */
 991
 992         if(S_ISDIR(pst->st_ex_mode)) {
 993                 return True;
 994         }
 995
 996         return can_write_to_file(conn, name, pst);
 997 }
 998
 999 /*******************************************************************
1000   Is a file a "special" type ?
1001 ********************************************************************/
1002
1003 static bool file_is_special(connection_struct *conn, char *name, SMB_STRUCT_STAT *pst)
1004 {
1005         /*
1006          * If user is a member of the Admin group
1007          * we never hide files from them.
1008          */
1009
1010         if (conn->admin_user)
1011                 return False;
1012
1013         SMB_ASSERT(VALID_STAT(*pst));
1014
1015         if (S_ISREG(pst->st_ex_mode) || S_ISDIR(pst->st_ex_mode) || S_ISLNK(pst->st_ex_mode))
1016                 return False;
1017
1018         return True;
1019 }
1020
1021 /*******************************************************************
1022  Should the file be seen by the client?
1023  NOTE: A successful return is no guarantee of the file's existence.
1024 ********************************************************************/
1025
1026 bool is_visible_file(connection_struct *conn, const char *dir_path,
1027                      const char *name, SMB_STRUCT_STAT *pst, bool use_veto)
1028 {
1029         bool hide_unreadable = lp_hideunreadable(SNUM(conn));
1030         bool hide_unwriteable = lp_hideunwriteable_files(SNUM(conn));
1031         bool hide_special = lp_hide_special_files(SNUM(conn));
1032
1033         if ((strcmp(".",name) == 0) || (strcmp("..",name) == 0)) {
1034                 return True; /* . and .. are always visible. */
1035         }
1036
1037         /* If it's a vetoed file, pretend it doesn't even exist */
1038         if (use_veto && IS_VETO_PATH(conn, name)) {
1039                 DEBUG(10,("is_visible_file: file %s is vetoed.\n", name ));
1040                 return False;
1041         }
1042
1043         if (hide_unreadable || hide_unwriteable || hide_special) {
1044                 char *entry = NULL;
1045
1046                 if (asprintf(&entry, "%s/%s", dir_path, name) == -1) {
1047                         return False;
1048                 }
1049
1050                 /* If it's a dfs symlink, ignore _hide xxxx_ options */
1051                 if (lp_host_msdfs() &&
1052                                 lp_msdfs_root(SNUM(conn)) &&
1053                                 is_msdfs_link(conn, entry, NULL)) {
1054                         SAFE_FREE(entry);
1055                         return True;
1056                 }
1057
1058                 /* If the file name does not exist, there's no point checking
1059                  * the configuration options. We succeed, on the basis that the
1060                  * checks *might* have passed if the file was present.
1061                  */
1062                 if (!VALID_STAT(*pst) && (SMB_VFS_STAT(conn, entry, pst) != 0))
1063                 {
1064                         SAFE_FREE(entry);
1065                         return True;
1066                 }
1067
1068                 /* Honour _hide unreadable_ option */
1069                 if (hide_unreadable && !user_can_read_file(conn, entry)) {
1070                         DEBUG(10,("is_visible_file: file %s is unreadable.\n",
1071                                  entry ));
1072                         SAFE_FREE(entry);
1073                         return False;
1074                 }
1075                 /* Honour _hide unwriteable_ option */
1076                 if (hide_unwriteable && !user_can_write_file(conn, entry, pst)) {
1077                         DEBUG(10,("is_visible_file: file %s is unwritable.\n",
1078                                  entry ));
1079                         SAFE_FREE(entry);
1080                         return False;
1081                 }
1082                 /* Honour _hide_special_ option */
1083                 if (hide_special && file_is_special(conn, entry, pst)) {
1084                         DEBUG(10,("is_visible_file: file %s is special.\n",
1085                                  entry ));
1086                         SAFE_FREE(entry);
1087                         return False;
1088                 }
1089                 SAFE_FREE(entry);
1090         }
1091         return True;
1092 }
1093
1094 static int smb_Dir_destructor(struct smb_Dir *dirp)
1095 {
1096         if (dirp->dir) {
1097                 SMB_VFS_CLOSEDIR(dirp->conn,dirp->dir);
1098         }
1099         dirhandles_open--;
1100         return 0;
1101 }
1102
1103 /*******************************************************************
1104  Open a directory.
1105 ********************************************************************/
1106
1107 struct smb_Dir *OpenDir(TALLOC_CTX *mem_ctx, connection_struct *conn,
1108                         const char *name, const char *mask, uint32 attr)
1109 {
1110         struct smb_Dir *dirp = TALLOC_ZERO_P(mem_ctx, struct smb_Dir);
1111
1112         if (!dirp) {
1113                 return NULL;
1114         }
1115
1116         dirp->conn = conn;
1117         dirp->name_cache_size = lp_directory_name_cache_size(SNUM(conn));
1118
1119         dirp->dir_path = talloc_strdup(dirp, name);
1120         if (!dirp->dir_path) {
1121                 errno = ENOMEM;
1122                 goto fail;
1123         }
1124
1125         dirhandles_open++;
1126         talloc_set_destructor(dirp, smb_Dir_destructor);
1127
1128         dirp->dir = SMB_VFS_OPENDIR(conn, dirp->dir_path, mask, attr);
1129         if (!dirp->dir) {
1130                 DEBUG(5,("OpenDir: Can't open %s. %s\n", dirp->dir_path,
1131                          strerror(errno) ));
1132                 goto fail;
1133         }
1134
1135         return dirp;
1136
1137   fail:
1138         TALLOC_FREE(dirp);
1139         return NULL;
1140 }
1141
1142 /*******************************************************************
1143  Read from a directory.
1144  Return directory entry, current offset, and optional stat information.
1145  Don't check for veto or invisible files.
1146 ********************************************************************/
1147
1148 const char *ReadDirName(struct smb_Dir *dirp, long *poffset,
1149                         SMB_STRUCT_STAT *sbuf)
1150 {
1151         const char *n;
1152         connection_struct *conn = dirp->conn;
1153
1154         /* Cheat to allow . and .. to be the first entries returned. */
1155         if (((*poffset == START_OF_DIRECTORY_OFFSET) ||
1156              (*poffset == DOT_DOT_DIRECTORY_OFFSET)) && (dirp->file_number < 2))
1157         {
1158                 if (dirp->file_number == 0) {
1159                         n = ".";
1160                         *poffset = dirp->offset = START_OF_DIRECTORY_OFFSET;
1161                 } else {
1162                         *poffset = dirp->offset = DOT_DOT_DIRECTORY_OFFSET;
1163                         n = "..";
1164                 }
1165                 dirp->file_number++;
1166                 return n;
1167         } else if (*poffset == END_OF_DIRECTORY_OFFSET) {
1168                 *poffset = dirp->offset = END_OF_DIRECTORY_OFFSET;
1169                 return NULL;
1170         } else {
1171                 /* A real offset, seek to it. */
1172                 SeekDir(dirp, *poffset);
1173         }
1174
1175         while ((n = vfs_readdirname(conn, dirp->dir, sbuf))) {
1176                 /* Ignore . and .. - we've already returned them. */
1177                 if (*n == '.') {
1178                         if ((n[1] == '\0') || (n[1] == '.' && n[2] == '\0')) {
1179                                 continue;
1180                         }
1181                 }
1182                 *poffset = dirp->offset = SMB_VFS_TELLDIR(conn, dirp->dir);
1183                 dirp->file_number++;
1184                 return n;
1185         }
1186         *poffset = dirp->offset = END_OF_DIRECTORY_OFFSET;
1187         return NULL;
1188 }
1189
1190 /*******************************************************************
1191  Rewind to the start.
1192 ********************************************************************/
1193
1194 void RewindDir(struct smb_Dir *dirp, long *poffset)
1195 {
1196         SMB_VFS_REWINDDIR(dirp->conn, dirp->dir);
1197         dirp->file_number = 0;
1198         dirp->offset = START_OF_DIRECTORY_OFFSET;
1199         *poffset = START_OF_DIRECTORY_OFFSET;
1200 }
1201
1202 /*******************************************************************
1203  Seek a dir.
1204 ********************************************************************/
1205
1206 void SeekDir(struct smb_Dir *dirp, long offset)
1207 {
1208         if (offset != dirp->offset) {
1209                 if (offset == START_OF_DIRECTORY_OFFSET) {
1210                         RewindDir(dirp, &offset);
1211                         /*
1212                          * Ok we should really set the file number here
1213                          * to 1 to enable ".." to be returned next. Trouble
1214                          * is I'm worried about callers using SeekDir(dirp,0)
1215                          * as equivalent to RewindDir(). So leave this alone
1216                          * for now.
1217                          */
1218                 } else if  (offset == DOT_DOT_DIRECTORY_OFFSET) {
1219                         RewindDir(dirp, &offset);
1220                         /*
1221                          * Set the file number to 2 - we want to get the first
1222                          * real file entry (the one we return after "..")
1223                          * on the next ReadDir.
1224                          */
1225                         dirp->file_number = 2;
1226                 } else if (offset == END_OF_DIRECTORY_OFFSET) {
1227                         ; /* Don't seek in this case. */
1228                 } else {
1229                         SMB_VFS_SEEKDIR(dirp->conn, dirp->dir, offset);
1230                 }
1231                 dirp->offset = offset;
1232         }
1233 }
1234
1235 /*******************************************************************
1236  Tell a dir position.
1237 ********************************************************************/
1238
1239 long TellDir(struct smb_Dir *dirp)
1240 {
1241         return(dirp->offset);
1242 }
1243
1244 /*******************************************************************
1245  Add an entry into the dcache.
1246 ********************************************************************/
1247
1248 void DirCacheAdd(struct smb_Dir *dirp, const char *name, long offset)
1249 {
1250         struct name_cache_entry *e;
1251
1252         if (dirp->name_cache_size == 0) {
1253                 return;
1254         }
1255
1256         if (dirp->name_cache == NULL) {
1257                 dirp->name_cache = TALLOC_ZERO_ARRAY(
1258                         dirp, struct name_cache_entry, dirp->name_cache_size);
1259
1260                 if (dirp->name_cache == NULL) {
1261                         return;
1262                 }
1263         }
1264
1265         dirp->name_cache_index = (dirp->name_cache_index+1) %
1266                                         dirp->name_cache_size;
1267         e = &dirp->name_cache[dirp->name_cache_index];
1268         TALLOC_FREE(e->name);
1269         e->name = talloc_strdup(dirp, name);
1270         e->offset = offset;
1271 }
1272
1273 /*******************************************************************
1274  Find an entry by name. Leave us at the offset after it.
1275  Don't check for veto or invisible files.
1276 ********************************************************************/
1277
1278 bool SearchDir(struct smb_Dir *dirp, const char *name, long *poffset)
1279 {
1280         int i;
1281         const char *entry;
1282         connection_struct *conn = dirp->conn;
1283
1284         /* Search back in the name cache. */
1285         if (dirp->name_cache_size && dirp->name_cache) {
1286                 for (i = dirp->name_cache_index; i >= 0; i--) {
1287                         struct name_cache_entry *e = &dirp->name_cache[i];
1288                         if (e->name && (conn->case_sensitive ? (strcmp(e->name, name) == 0) : strequal(e->name, name))) {
1289                                 *poffset = e->offset;
1290                                 SeekDir(dirp, e->offset);
1291                                 return True;
1292                         }
1293                 }
1294                 for (i = dirp->name_cache_size - 1; i > dirp->name_cache_index; i--) {
1295                         struct name_cache_entry *e = &dirp->name_cache[i];
1296                         if (e->name && (conn->case_sensitive ? (strcmp(e->name, name) == 0) : strequal(e->name, name))) {
1297                                 *poffset = e->offset;
1298                                 SeekDir(dirp, e->offset);
1299                                 return True;
1300                         }
1301                 }
1302         }
1303
1304         /* Not found in the name cache. Rewind directory and start from scratch. */
1305         SMB_VFS_REWINDDIR(conn, dirp->dir);
1306         dirp->file_number = 0;
1307         *poffset = START_OF_DIRECTORY_OFFSET;
1308         while ((entry = ReadDirName(dirp, poffset, NULL))) {
1309                 if (conn->case_sensitive ? (strcmp(entry, name) == 0) : strequal(entry, name)) {
1310                         return True;
1311                 }
1312         }
1313         return False;
1314 }
1315
1316 /*****************************************************************
1317  Is this directory empty ?
1318 *****************************************************************/
1319
1320 NTSTATUS can_delete_directory(struct connection_struct *conn,
1321                                 const char *dirname)
1322 {
1323         NTSTATUS status = NT_STATUS_OK;
1324         long dirpos = 0;
1325         const char *dname;
1326         SMB_STRUCT_STAT st;
1327         struct smb_Dir *dir_hnd = OpenDir(talloc_tos(), conn, dirname,
1328                                           NULL, 0);
1329
1330         if (!dir_hnd) {
1331                 return map_nt_error_from_unix(errno);
1332         }
1333
1334         while ((dname = ReadDirName(dir_hnd, &dirpos, &st))) {
1335                 /* Quick check for "." and ".." */
1336                 if (dname[0] == '.') {
1337                         if (!dname[1] || (dname[1] == '.' && !dname[2])) {
1338                                 continue;
1339                         }
1340                 }
1341
1342                 if (!is_visible_file(conn, dirname, dname, &st, True)) {
1343                         continue;
1344                 }
1345
1346                 DEBUG(10,("can_delete_directory: got name %s - can't delete\n",
1347                          dname ));
1348                 status = NT_STATUS_DIRECTORY_NOT_EMPTY;
1349                 break;
1350         }
1351         TALLOC_FREE(dir_hnd);
1352
1353         return status;
1354 }