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 #include "libcli/security/security.h"
  24
  25 /*
  26    This module implements directory related functions for Samba.
  27 */
  28
  29 /* "Special" directory offsets. */
  30 #define END_OF_DIRECTORY_OFFSET ((long)-1)
  31 #define START_OF_DIRECTORY_OFFSET ((long)0)
  32 #define DOT_DOT_DIRECTORY_OFFSET ((long)0x80000000)
  33
  34 /* Make directory handle internals available. */
  35
  36 struct name_cache_entry {
  37         char *name;
  38         long offset;
  39 };
  40
  41 struct smb_Dir {
  42         connection_struct *conn;
  43         SMB_STRUCT_DIR *dir;
  44         long offset;
  45         char *dir_path;
  46         size_t name_cache_size;
  47         struct name_cache_entry *name_cache;
  48         unsigned int name_cache_index;
  49         unsigned int file_number;
  50 };
  51
  52 struct dptr_struct {
  53         struct dptr_struct *next, *prev;
  54         int dnum;
  55         uint16 spid;
  56         struct connection_struct *conn;
  57         struct smb_Dir *dir_hnd;
  58         bool expect_close;
  59         char *wcard;
  60         uint32 attr;
  61         char *path;
  62         bool has_wild; /* Set to true if the wcard entry has MS wildcard characters in it. */
  63         bool did_stat; /* Optimisation for non-wcard searches. */
  64 };
  65
  66 static struct smb_Dir *OpenDir_fsp(TALLOC_CTX *mem_ctx, connection_struct *conn,
  67                         files_struct *fsp,
  68                         const char *mask,
  69                         uint32 attr);
  70
  71 #define INVALID_DPTR_KEY (-3)
  72
  73 /****************************************************************************
  74  Make a dir struct.
  75 ****************************************************************************/
  76
  77 bool make_dir_struct(TALLOC_CTX *ctx,
  78                         char *buf,
  79                         const char *mask,
  80                         const char *fname,
  81                         SMB_OFF_T size,
  82                         uint32 mode,
  83                         time_t date,
  84                         bool uc)
  85 {
  86         char *p;
  87         char *mask2 = talloc_strdup(ctx, mask);
  88
  89         if (!mask2) {
  90                 return False;
  91         }
  92
  93         if ((mode & aDIR) != 0) {
  94                 size = 0;
  95         }
  96
  97         memset(buf+1,' ',11);
  98         if ((p = strchr_m(mask2,'.')) != NULL) {
  99                 *p = 0;
 100                 push_ascii(buf+1,mask2,8, 0);
 101                 push_ascii(buf+9,p+1,3, 0);
 102                 *p = '.';
 103         } else {
 104                 push_ascii(buf+1,mask2,11, 0);
 105         }
 106
 107         memset(buf+21,'\0',DIR_STRUCT_SIZE-21);
 108         SCVAL(buf,21,mode);
 109         srv_put_dos_date(buf,22,date);
 110         SSVAL(buf,26,size & 0xFFFF);
 111         SSVAL(buf,28,(size >> 16)&0xFFFF);
 112         /* We only uppercase if FLAGS2_LONG_PATH_COMPONENTS is zero in the input buf.
 113            Strange, but verified on W2K3. Needed for OS/2. JRA. */
 114         push_ascii(buf+30,fname,12, uc ? STR_UPPER : 0);
 115         DEBUG(8,("put name [%s] from [%s] into dir struct\n",buf+30, fname));
 116         return True;
 117 }
 118
 119 /****************************************************************************
 120  Initialise the dir bitmap.
 121 ****************************************************************************/
 122
 123 bool init_dptrs(struct smbd_server_connection *sconn)
 124 {
 125         if (sconn->smb1.searches.dptr_bmap) {
 126                 return true;
 127         }
 128
 129         sconn->smb1.searches.dptr_bmap = bitmap_talloc(
 130                 sconn, MAX_DIRECTORY_HANDLES);
 131
 132         if (sconn->smb1.searches.dptr_bmap == NULL) {
 133                 return false;
 134         }
 135
 136         return true;
 137 }
 138
 139 /****************************************************************************
 140  Idle a dptr - the directory is closed but the control info is kept.
 141 ****************************************************************************/
 142
 143 static void dptr_idle(struct dptr_struct *dptr)
 144 {
 145         if (dptr->dir_hnd) {
 146                 DEBUG(4,("Idling dptr dnum %d\n",dptr->dnum));
 147                 TALLOC_FREE(dptr->dir_hnd);
 148         }
 149 }
 150
 151 /****************************************************************************
 152  Idle the oldest dptr.
 153 ****************************************************************************/
 154
 155 static void dptr_idleoldest(struct smbd_server_connection *sconn)
 156 {
 157         struct dptr_struct *dptr;
 158
 159         /*
 160          * Go to the end of the list.
 161          */
 162         dptr = DLIST_TAIL(sconn->smb1.searches.dirptrs);
 163
 164         if(!dptr) {
 165                 DEBUG(0,("No dptrs available to idle ?\n"));
 166                 return;
 167         }
 168
 169         /*
 170          * Idle the oldest pointer.
 171          */
 172
 173         for(; dptr; dptr = DLIST_PREV(dptr)) {
 174                 if (dptr->dir_hnd) {
 175                         dptr_idle(dptr);
 176                         return;
 177                 }
 178         }
 179 }
 180
 181 /****************************************************************************
 182  Get the struct dptr_struct for a dir index.
 183 ****************************************************************************/
 184
 185 static struct dptr_struct *dptr_get(struct smbd_server_connection *sconn,
 186                                     int key, bool forclose)
 187 {
 188         struct dptr_struct *dptr;
 189
 190         for(dptr = sconn->smb1.searches.dirptrs; dptr; dptr = dptr->next) {
 191                 if(dptr->dnum == key) {
 192                         if (!forclose && !dptr->dir_hnd) {
 193                                 if (sconn->smb1.searches.dirhandles_open >= MAX_OPEN_DIRECTORIES)
 194                                         dptr_idleoldest(sconn);
 195                                 DEBUG(4,("dptr_get: Reopening dptr key %d\n",key));
 196                                 if (!(dptr->dir_hnd = OpenDir(
 197                                               NULL, dptr->conn, dptr->path,
 198                                               dptr->wcard, dptr->attr))) {
 199                                         DEBUG(4,("dptr_get: Failed to open %s (%s)\n",dptr->path,
 200                                                 strerror(errno)));
 201                                         return False;
 202                                 }
 203                         }
 204                         DLIST_PROMOTE(sconn->smb1.searches.dirptrs,dptr);
 205                         return dptr;
 206                 }
 207         }
 208         return(NULL);
 209 }
 210
 211 /****************************************************************************
 212  Get the dir path for a dir index.
 213 ****************************************************************************/
 214
 215 char *dptr_path(struct smbd_server_connection *sconn, int key)
 216 {
 217         struct dptr_struct *dptr = dptr_get(sconn, key, false);
 218         if (dptr)
 219                 return(dptr->path);
 220         return(NULL);
 221 }
 222
 223 /****************************************************************************
 224  Get the dir wcard for a dir index.
 225 ****************************************************************************/
 226
 227 char *dptr_wcard(struct smbd_server_connection *sconn, int key)
 228 {
 229         struct dptr_struct *dptr = dptr_get(sconn, key, false);
 230         if (dptr)
 231                 return(dptr->wcard);
 232         return(NULL);
 233 }
 234
 235 /****************************************************************************
 236  Get the dir attrib for a dir index.
 237 ****************************************************************************/
 238
 239 uint16 dptr_attr(struct smbd_server_connection *sconn, int key)
 240 {
 241         struct dptr_struct *dptr = dptr_get(sconn, key, false);
 242         if (dptr)
 243                 return(dptr->attr);
 244         return(0);
 245 }
 246
 247 /****************************************************************************
 248  Close a dptr (internal func).
 249 ****************************************************************************/
 250
 251 static void dptr_close_internal(struct dptr_struct *dptr)
 252 {
 253         struct smbd_server_connection *sconn = dptr->conn->sconn;
 254
 255         DEBUG(4,("closing dptr key %d\n",dptr->dnum));
 256
 257         if (sconn == NULL) {
 258                 goto done;
 259         }
 260
 261         DLIST_REMOVE(sconn->smb1.searches.dirptrs, dptr);
 262
 263         /*
 264          * Free the dnum in the bitmap. Remember the dnum value is always
 265          * biased by one with respect to the bitmap.
 266          */
 267
 268         if (!bitmap_query(sconn->smb1.searches.dptr_bmap, dptr->dnum - 1)) {
 269                 DEBUG(0,("dptr_close_internal : Error - closing dnum = %d and bitmap not set !\n",
 270                         dptr->dnum ));
 271         }
 272
 273         bitmap_clear(sconn->smb1.searches.dptr_bmap, dptr->dnum - 1);
 274
 275 done:
 276         TALLOC_FREE(dptr->dir_hnd);
 277
 278         /* Lanman 2 specific code */
 279         SAFE_FREE(dptr->wcard);
 280         string_set(&dptr->path,"");
 281         SAFE_FREE(dptr);
 282 }
 283
 284 /****************************************************************************
 285  Close a dptr given a key.
 286 ****************************************************************************/
 287
 288 void dptr_close(struct smbd_server_connection *sconn, int *key)
 289 {
 290         struct dptr_struct *dptr;
 291
 292         if(*key == INVALID_DPTR_KEY)
 293                 return;
 294
 295         /* OS/2 seems to use -1 to indicate "close all directories" */
 296         if (*key == -1) {
 297                 struct dptr_struct *next;
 298                 for(dptr = sconn->smb1.searches.dirptrs; dptr; dptr = next) {
 299                         next = dptr->next;
 300                         dptr_close_internal(dptr);
 301                 }
 302                 *key = INVALID_DPTR_KEY;
 303                 return;
 304         }
 305
 306         dptr = dptr_get(sconn, *key, true);
 307
 308         if (!dptr) {
 309                 DEBUG(0,("Invalid key %d given to dptr_close\n", *key));
 310                 return;
 311         }
 312
 313         dptr_close_internal(dptr);
 314
 315         *key = INVALID_DPTR_KEY;
 316 }
 317
 318 /****************************************************************************
 319  Close all dptrs for a cnum.
 320 ****************************************************************************/
 321
 322 void dptr_closecnum(connection_struct *conn)
 323 {
 324         struct dptr_struct *dptr, *next;
 325         struct smbd_server_connection *sconn = conn->sconn;
 326
 327         if (sconn == NULL) {
 328                 return;
 329         }
 330
 331         for(dptr = sconn->smb1.searches.dirptrs; dptr; dptr = next) {
 332                 next = dptr->next;
 333                 if (dptr->conn == conn) {
 334                         dptr_close_internal(dptr);
 335                 }
 336         }
 337 }
 338
 339 /****************************************************************************
 340  Idle all dptrs for a cnum.
 341 ****************************************************************************/
 342
 343 void dptr_idlecnum(connection_struct *conn)
 344 {
 345         struct dptr_struct *dptr;
 346         struct smbd_server_connection *sconn = conn->sconn;
 347
 348         if (sconn == NULL) {
 349                 return;
 350         }
 351
 352         for(dptr = sconn->smb1.searches.dirptrs; dptr; dptr = dptr->next) {
 353                 if (dptr->conn == conn && dptr->dir_hnd) {
 354                         dptr_idle(dptr);
 355                 }
 356         }
 357 }
 358
 359 /****************************************************************************
 360  Close a dptr that matches a given path, only if it matches the spid also.
 361 ****************************************************************************/
 362
 363 void dptr_closepath(struct smbd_server_connection *sconn,
 364                     char *path,uint16 spid)
 365 {
 366         struct dptr_struct *dptr, *next;
 367         for(dptr = sconn->smb1.searches.dirptrs; dptr; dptr = next) {
 368                 next = dptr->next;
 369                 if (spid == dptr->spid && strequal(dptr->path,path))
 370                         dptr_close_internal(dptr);
 371         }
 372 }
 373
 374 /****************************************************************************
 375  Try and close the oldest handle not marked for
 376  expect close in the hope that the client has
 377  finished with that one.
 378 ****************************************************************************/
 379
 380 static void dptr_close_oldest(struct smbd_server_connection *sconn,
 381                               bool old)
 382 {
 383         struct dptr_struct *dptr;
 384
 385         /*
 386          * Go to the end of the list.
 387          */
 388         for(dptr = sconn->smb1.searches.dirptrs; dptr && dptr->next; dptr = dptr->next)
 389                 ;
 390
 391         if(!dptr) {
 392                 DEBUG(0,("No old dptrs available to close oldest ?\n"));
 393                 return;
 394         }
 395
 396         /*
 397          * If 'old' is true, close the oldest oldhandle dnum (ie. 1 < dnum < 256) that
 398          * does not have expect_close set. If 'old' is false, close
 399          * one of the new dnum handles.
 400          */
 401
 402         for(; dptr; dptr = DLIST_PREV(dptr)) {
 403                 if ((old && (dptr->dnum < 256) && !dptr->expect_close) ||
 404                         (!old && (dptr->dnum > 255))) {
 405                                 dptr_close_internal(dptr);
 406                                 return;
 407                 }
 408         }
 409 }
 410
 411 /****************************************************************************
 412  Create a new dir ptr. If the flag old_handle is true then we must allocate
 413  from the bitmap range 0 - 255 as old SMBsearch directory handles are only
 414  one byte long. If old_handle is false we allocate from the range
 415  256 - MAX_DIRECTORY_HANDLES. We bias the number we return by 1 to ensure
 416  a directory handle is never zero.
 417  wcard must not be zero.
 418 ****************************************************************************/
 419
 420 NTSTATUS dptr_create(connection_struct *conn, files_struct *fsp,
 421                 const char *path, bool old_handle, bool expect_close,uint16 spid,
 422                 const char *wcard, bool wcard_has_wild, uint32 attr, struct dptr_struct **dptr_ret)
 423 {
 424         struct smbd_server_connection *sconn = conn->sconn;
 425         struct dptr_struct *dptr = NULL;
 426         struct smb_Dir *dir_hnd;
 427         NTSTATUS status;
 428
 429         if (fsp && fsp->is_directory && fsp->fh->fd != -1) {
 430                 path = fsp->fsp_name->base_name;
 431         }
 432
 433         DEBUG(5,("dptr_create dir=%s\n", path));
 434
 435         if (sconn == NULL) {
 436                 DEBUG(0,("dptr_create: called with fake connection_struct\n"));
 437                 return NT_STATUS_INTERNAL_ERROR;
 438         }
 439
 440         if (!wcard) {
 441                 return NT_STATUS_INVALID_PARAMETER;
 442         }
 443
 444         if (fsp) {
 445                 dir_hnd = OpenDir_fsp(NULL, conn, fsp, wcard, attr);
 446         } else {
 447                 status = check_name(conn,path);
 448                 if (!NT_STATUS_IS_OK(status)) {
 449                         return status;
 450                 }
 451                 dir_hnd = OpenDir(NULL, conn, path, wcard, attr);
 452         }
 453
 454         if (!dir_hnd) {
 455                 return map_nt_error_from_unix(errno);
 456         }
 457
 458         if (sconn->smb1.searches.dirhandles_open >= MAX_OPEN_DIRECTORIES) {
 459                 dptr_idleoldest(sconn);
 460         }
 461
 462         dptr = SMB_MALLOC_P(struct dptr_struct);
 463         if(!dptr) {
 464                 DEBUG(0,("malloc fail in dptr_create.\n"));
 465                 TALLOC_FREE(dir_hnd);
 466                 return NT_STATUS_NO_MEMORY;
 467         }
 468
 469         ZERO_STRUCTP(dptr);
 470
 471         if(old_handle) {
 472
 473                 /*
 474                  * This is an old-style SMBsearch request. Ensure the
 475                  * value we return will fit in the range 1-255.
 476                  */
 477
 478                 dptr->dnum = bitmap_find(sconn->smb1.searches.dptr_bmap, 0);
 479
 480                 if(dptr->dnum == -1 || dptr->dnum > 254) {
 481
 482                         /*
 483                          * Try and close the oldest handle not marked for
 484                          * expect close in the hope that the client has
 485                          * finished with that one.
 486                          */
 487
 488                         dptr_close_oldest(sconn, true);
 489
 490                         /* Now try again... */
 491                         dptr->dnum = bitmap_find(sconn->smb1.searches.dptr_bmap, 0);
 492                         if(dptr->dnum == -1 || dptr->dnum > 254) {
 493                                 DEBUG(0,("dptr_create: returned %d: Error - all old dirptrs in use ?\n", dptr->dnum));
 494                                 SAFE_FREE(dptr);
 495                                 TALLOC_FREE(dir_hnd);
 496                                 return NT_STATUS_TOO_MANY_OPENED_FILES;
 497                         }
 498                 }
 499         } else {
 500
 501                 /*
 502                  * This is a new-style trans2 request. Allocate from
 503                  * a range that will return 256 - MAX_DIRECTORY_HANDLES.
 504                  */
 505
 506                 dptr->dnum = bitmap_find(sconn->smb1.searches.dptr_bmap, 255);
 507
 508                 if(dptr->dnum == -1 || dptr->dnum < 255) {
 509
 510                         /*
 511                          * Try and close the oldest handle close in the hope that
 512                          * the client has finished with that one. This will only
 513                          * happen in the case of the Win98 client bug where it leaks
 514                          * directory handles.
 515                          */
 516
 517                         dptr_close_oldest(sconn, false);
 518
 519                         /* Now try again... */
 520                         dptr->dnum = bitmap_find(sconn->smb1.searches.dptr_bmap, 255);
 521
 522                         if(dptr->dnum == -1 || dptr->dnum < 255) {
 523                                 DEBUG(0,("dptr_create: returned %d: Error - all new dirptrs in use ?\n", dptr->dnum));
 524                                 SAFE_FREE(dptr);
 525                                 TALLOC_FREE(dir_hnd);
 526                                 return NT_STATUS_TOO_MANY_OPENED_FILES;
 527                         }
 528                 }
 529         }
 530
 531         bitmap_set(sconn->smb1.searches.dptr_bmap, dptr->dnum);
 532
 533         dptr->dnum += 1; /* Always bias the dnum by one - no zero dnums allowed. */
 534
 535         string_set(&dptr->path,path);
 536         dptr->conn = conn;
 537         dptr->dir_hnd = dir_hnd;
 538         dptr->spid = spid;
 539         dptr->expect_close = expect_close;
 540         dptr->wcard = SMB_STRDUP(wcard);
 541         if (!dptr->wcard) {
 542                 bitmap_clear(sconn->smb1.searches.dptr_bmap, dptr->dnum - 1);
 543                 SAFE_FREE(dptr);
 544                 TALLOC_FREE(dir_hnd);
 545                 return NT_STATUS_NO_MEMORY;
 546         }
 547         if (lp_posix_pathnames() || (wcard[0] == '.' && wcard[1] == 0)) {
 548                 dptr->has_wild = True;
 549         } else {
 550                 dptr->has_wild = wcard_has_wild;
 551         }
 552
 553         dptr->attr = attr;
 554
 555         DLIST_ADD(sconn->smb1.searches.dirptrs, dptr);
 556
 557         DEBUG(3,("creating new dirptr %d for path %s, expect_close = %d\n",
 558                 dptr->dnum,path,expect_close));
 559
 560         *dptr_ret = dptr;
 561
 562         return NT_STATUS_OK;
 563 }
 564
 565
 566 /****************************************************************************
 567  Wrapper functions to access the lower level directory handles.
 568 ****************************************************************************/
 569
 570 void dptr_CloseDir(files_struct *fsp)
 571 {
 572         if (fsp->dptr) {
 573 /*
 574  * Ugly hack. We have defined fdopendir to return ENOSYS if dirfd also isn't
 575  * present. I hate Solaris. JRA.
 576  */
 577 #ifdef HAVE_DIRFD
 578                 if (fsp->fh->fd == dirfd(fsp->dptr->dir_hnd->dir)) {
 579                         /* The call below closes the underlying fd. */
 580                         fsp->fh->fd = -1;
 581                 }
 582 #endif
 583                 dptr_close_internal(fsp->dptr);
 584                 fsp->dptr = NULL;
 585         }
 586 }
 587
 588 void dptr_SeekDir(struct dptr_struct *dptr, long offset)
 589 {
 590         SeekDir(dptr->dir_hnd, offset);
 591 }
 592
 593 long dptr_TellDir(struct dptr_struct *dptr)
 594 {
 595         return TellDir(dptr->dir_hnd);
 596 }
 597
 598 bool dptr_has_wild(struct dptr_struct *dptr)
 599 {
 600         return dptr->has_wild;
 601 }
 602
 603 int dptr_dnum(struct dptr_struct *dptr)
 604 {
 605         return dptr->dnum;
 606 }
 607
 608 /****************************************************************************
 609  Return the next visible file name, skipping veto'd and invisible files.
 610 ****************************************************************************/
 611
 612 static const char *dptr_normal_ReadDirName(struct dptr_struct *dptr,
 613                                            long *poffset, SMB_STRUCT_STAT *pst,
 614                                            char **ptalloced)
 615 {
 616         /* Normal search for the next file. */
 617         const char *name;
 618         char *talloced = NULL;
 619
 620         while ((name = ReadDirName(dptr->dir_hnd, poffset, pst, &talloced))
 621                != NULL) {
 622                 if (is_visible_file(dptr->conn, dptr->path, name, pst, True)) {
 623                         *ptalloced = talloced;
 624                         return name;
 625                 }
 626                 TALLOC_FREE(talloced);
 627         }
 628         return NULL;
 629 }
 630
 631 /****************************************************************************
 632  Return the next visible file name, skipping veto'd and invisible files.
 633 ****************************************************************************/
 634
 635 char *dptr_ReadDirName(TALLOC_CTX *ctx,
 636                         struct dptr_struct *dptr,
 637                         long *poffset,
 638                         SMB_STRUCT_STAT *pst)
 639 {
 640         struct smb_filename smb_fname_base;
 641         char *name = NULL;
 642         const char *name_temp = NULL;
 643         char *talloced = NULL;
 644         char *pathreal = NULL;
 645         char *found_name = NULL;
 646         int ret;
 647
 648         SET_STAT_INVALID(*pst);
 649
 650         if (dptr->has_wild || dptr->did_stat) {
 651                 name_temp = dptr_normal_ReadDirName(dptr, poffset, pst,
 652                                                     &talloced);
 653                 if (name_temp == NULL) {
 654                         return NULL;
 655                 }
 656                 if (talloced != NULL) {
 657                         return talloc_move(ctx, &talloced);
 658                 }
 659                 return talloc_strdup(ctx, name_temp);
 660         }
 661
 662         /* If poffset is -1 then we know we returned this name before and we
 663          * have no wildcards. We're at the end of the directory. */
 664         if (*poffset == END_OF_DIRECTORY_OFFSET) {
 665                 return NULL;
 666         }
 667
 668         /* We know the stored wcard contains no wildcard characters.
 669          * See if we can match with a stat call. If we can't, then set
 670          * did_stat to true to ensure we only do this once and keep
 671          * searching. */
 672
 673         dptr->did_stat = true;
 674
 675         /* First check if it should be visible. */
 676         if (!is_visible_file(dptr->conn, dptr->path, dptr->wcard,
 677             pst, true))
 678         {
 679                 /* This only returns false if the file was found, but
 680                    is explicitly not visible. Set us to end of
 681                    directory, but return NULL as we know we can't ever
 682                    find it. */
 683                 goto ret;
 684         }
 685
 686         if (VALID_STAT(*pst)) {
 687                 name = talloc_strdup(ctx, dptr->wcard);
 688                 goto ret;
 689         }
 690
 691         pathreal = talloc_asprintf(ctx,
 692                                 "%s/%s",
 693                                 dptr->path,
 694                                 dptr->wcard);
 695         if (!pathreal)
 696                 return NULL;
 697
 698         /* Create an smb_filename with stream_name == NULL. */
 699         ZERO_STRUCT(smb_fname_base);
 700         smb_fname_base.base_name = pathreal;
 701
 702         if (SMB_VFS_STAT(dptr->conn, &smb_fname_base) == 0) {
 703                 *pst = smb_fname_base.st;
 704                 name = talloc_strdup(ctx, dptr->wcard);
 705                 goto clean;
 706         } else {
 707                 /* If we get any other error than ENOENT or ENOTDIR
 708                    then the file exists we just can't stat it. */
 709                 if (errno != ENOENT && errno != ENOTDIR) {
 710                         name = talloc_strdup(ctx, dptr->wcard);
 711                         goto clean;
 712                 }
 713         }
 714
 715         /* Stat failed. We know this is authoratiative if we are
 716          * providing case sensitive semantics or the underlying
 717          * filesystem is case sensitive.
 718          */
 719         if (dptr->conn->case_sensitive ||
 720             !(dptr->conn->fs_capabilities & FILE_CASE_SENSITIVE_SEARCH))
 721         {
 722                 goto clean;
 723         }
 724
 725         /*
 726          * Try case-insensitive stat if the fs has the ability. This avoids
 727          * scanning the whole directory.
 728          */
 729         ret = SMB_VFS_GET_REAL_FILENAME(dptr->conn, dptr->path, dptr->wcard,
 730                                         ctx, &found_name);
 731         if (ret == 0) {
 732                 name = found_name;
 733                 goto clean;
 734         } else if (errno == ENOENT) {
 735                 /* The case-insensitive lookup was authoritative. */
 736                 goto clean;
 737         }
 738
 739         TALLOC_FREE(pathreal);
 740
 741         name_temp = dptr_normal_ReadDirName(dptr, poffset, pst, &talloced);
 742         if (name_temp == NULL) {
 743                 return NULL;
 744         }
 745         if (talloced != NULL) {
 746                 return talloc_move(ctx, &talloced);
 747         }
 748         return talloc_strdup(ctx, name_temp);
 749
 750 clean:
 751         TALLOC_FREE(pathreal);
 752 ret:
 753         /* We need to set the underlying dir_hnd offset to -1
 754          * also as this function is usually called with the
 755          * output from TellDir. */
 756         dptr->dir_hnd->offset = *poffset = END_OF_DIRECTORY_OFFSET;
 757         return name;
 758 }
 759
 760 /****************************************************************************
 761  Search for a file by name, skipping veto'ed and not visible files.
 762 ****************************************************************************/
 763
 764 bool dptr_SearchDir(struct dptr_struct *dptr, const char *name, long *poffset, SMB_STRUCT_STAT *pst)
 765 {
 766         SET_STAT_INVALID(*pst);
 767
 768         if (!dptr->has_wild && (dptr->dir_hnd->offset == END_OF_DIRECTORY_OFFSET)) {
 769                 /* This is a singleton directory and we're already at the end. */
 770                 *poffset = END_OF_DIRECTORY_OFFSET;
 771                 return False;
 772         }
 773
 774         return SearchDir(dptr->dir_hnd, name, poffset);
 775 }
 776
 777 /****************************************************************************
 778  Add the name we're returning into the underlying cache.
 779 ****************************************************************************/
 780
 781 void dptr_DirCacheAdd(struct dptr_struct *dptr, const char *name, long offset)
 782 {
 783         DirCacheAdd(dptr->dir_hnd, name, offset);
 784 }
 785
 786 /****************************************************************************
 787  Initialize variables & state data at the beginning of all search SMB requests.
 788 ****************************************************************************/
 789 void dptr_init_search_op(struct dptr_struct *dptr)
 790 {
 791         SMB_VFS_INIT_SEARCH_OP(dptr->conn, dptr->dir_hnd->dir);
 792 }
 793
 794 /****************************************************************************
 795  Fill the 5 byte server reserved dptr field.
 796 ****************************************************************************/
 797
 798 bool dptr_fill(struct smbd_server_connection *sconn,
 799                char *buf1,unsigned int key)
 800 {
 801         unsigned char *buf = (unsigned char *)buf1;
 802         struct dptr_struct *dptr = dptr_get(sconn, key, false);
 803         uint32 offset;
 804         if (!dptr) {
 805                 DEBUG(1,("filling null dirptr %d\n",key));
 806                 return(False);
 807         }
 808         offset = (uint32)TellDir(dptr->dir_hnd);
 809         DEBUG(6,("fill on key %u dirptr 0x%lx now at %d\n",key,
 810                 (long)dptr->dir_hnd,(int)offset));
 811         buf[0] = key;
 812         SIVAL(buf,1,offset);
 813         return(True);
 814 }
 815
 816 /****************************************************************************
 817  Fetch the dir ptr and seek it given the 5 byte server field.
 818 ****************************************************************************/
 819
 820 struct dptr_struct *dptr_fetch(struct smbd_server_connection *sconn,
 821                                char *buf, int *num)
 822 {
 823         unsigned int key = *(unsigned char *)buf;
 824         struct dptr_struct *dptr = dptr_get(sconn, key, false);
 825         uint32 offset;
 826         long seekoff;
 827
 828         if (!dptr) {
 829                 DEBUG(3,("fetched null dirptr %d\n",key));
 830                 return(NULL);
 831         }
 832         *num = key;
 833         offset = IVAL(buf,1);
 834         if (offset == (uint32)-1) {
 835                 seekoff = END_OF_DIRECTORY_OFFSET;
 836         } else {
 837                 seekoff = (long)offset;
 838         }
 839         SeekDir(dptr->dir_hnd,seekoff);
 840         DEBUG(3,("fetching dirptr %d for path %s at offset %d\n",
 841                 key, dptr->path, (int)seekoff));
 842         return(dptr);
 843 }
 844
 845 /****************************************************************************
 846  Fetch the dir ptr.
 847 ****************************************************************************/
 848
 849 struct dptr_struct *dptr_fetch_lanman2(struct smbd_server_connection *sconn,
 850                                        int dptr_num)
 851 {
 852         struct dptr_struct *dptr  = dptr_get(sconn, dptr_num, false);
 853
 854         if (!dptr) {
 855                 DEBUG(3,("fetched null dirptr %d\n",dptr_num));
 856                 return(NULL);
 857         }
 858         DEBUG(3,("fetching dirptr %d for path %s\n",dptr_num,dptr->path));
 859         return(dptr);
 860 }
 861
 862 /****************************************************************************
 863  Check that a file matches a particular file type.
 864 ****************************************************************************/
 865
 866 bool dir_check_ftype(connection_struct *conn, uint32 mode, uint32 dirtype)
 867 {
 868         uint32 mask;
 869
 870         /* Check the "may have" search bits. */
 871         if (((mode & ~dirtype) & (aHIDDEN | aSYSTEM | aDIR)) != 0)
 872                 return False;
 873
 874         /* Check the "must have" bits, which are the may have bits shifted eight */
 875         /* If must have bit is set, the file/dir can not be returned in search unless the matching
 876                 file attribute is set */
 877         mask = ((dirtype >> 8) & (aDIR|aARCH|aRONLY|aHIDDEN|aSYSTEM)); /* & 0x37 */
 878         if(mask) {
 879                 if((mask & (mode & (aDIR|aARCH|aRONLY|aHIDDEN|aSYSTEM))) == mask)   /* check if matching attribute present */
 880                         return True;
 881                 else
 882                         return False;
 883         }
 884
 885         return True;
 886 }
 887
 888 static bool mangle_mask_match(connection_struct *conn,
 889                 const char *filename,
 890                 const char *mask)
 891 {
 892         char mname[13];
 893
 894         if (!name_to_8_3(filename,mname,False,conn->params)) {
 895                 return False;
 896         }
 897         return mask_match_search(mname,mask,False);
 898 }
 899
 900 bool smbd_dirptr_get_entry(TALLOC_CTX *ctx,
 901                            struct dptr_struct *dirptr,
 902                            const char *mask,
 903                            uint32_t dirtype,
 904                            bool dont_descend,
 905                            bool ask_sharemode,
 906                            bool (*match_fn)(TALLOC_CTX *ctx,
 907                                             void *private_data,
 908                                             const char *dname,
 909                                             const char *mask,
 910                                             char **_fname),
 911                            bool (*mode_fn)(TALLOC_CTX *ctx,
 912                                            void *private_data,
 913                                            struct smb_filename *smb_fname,
 914                                            uint32_t *_mode),
 915                            void *private_data,
 916                            char **_fname,
 917                            struct smb_filename **_smb_fname,
 918                            uint32_t *_mode,
 919                            long *_prev_offset)
 920 {
 921         connection_struct *conn = dirptr->conn;
 922         bool needslash;
 923
 924         *_smb_fname = NULL;
 925         *_mode = 0;
 926
 927         needslash = ( dirptr->path[strlen(dirptr->path) -1] != '/');
 928
 929         while (true) {
 930                 long cur_offset;
 931                 long prev_offset;
 932                 SMB_STRUCT_STAT sbuf;
 933                 char *dname = NULL;
 934                 bool isdots;
 935                 char *fname = NULL;
 936                 char *pathreal = NULL;
 937                 struct smb_filename smb_fname;
 938                 uint32_t mode = 0;
 939                 bool ok;
 940                 NTSTATUS status;
 941
 942                 cur_offset = dptr_TellDir(dirptr);
 943                 prev_offset = cur_offset;
 944                 dname = dptr_ReadDirName(ctx, dirptr, &cur_offset, &sbuf);
 945
 946                 DEBUG(6,("smbd_dirptr_get_entry: dirptr 0x%lx now at offset %ld\n",
 947                         (long)dirptr, cur_offset));
 948
 949                 if (dname == NULL) {
 950                         return false;
 951                 }
 952
 953                 isdots = (ISDOT(dname) || ISDOTDOT(dname));
 954                 if (dont_descend && !isdots) {
 955                         TALLOC_FREE(dname);
 956                         continue;
 957                 }
 958
 959                 /*
 960                  * fname may get mangled, dname is never mangled.
 961                  * Whenever we're accessing the filesystem we use
 962                  * pathreal which is composed from dname.
 963                  */
 964
 965                 ok = match_fn(ctx, private_data, dname, mask, &fname);
 966                 if (!ok) {
 967                         TALLOC_FREE(dname);
 968                         continue;
 969                 }
 970
 971                 pathreal = talloc_asprintf(ctx, "%s%s%s",
 972                                            dirptr->path,
 973                                            needslash?"/":"",
 974                                            dname);
 975                 if (!pathreal) {
 976                         TALLOC_FREE(dname);
 977                         TALLOC_FREE(fname);
 978                         return false;
 979                 }
 980
 981                 /* Create smb_fname with NULL stream_name. */
 982                 ZERO_STRUCT(smb_fname);
 983                 smb_fname.base_name = pathreal;
 984                 smb_fname.st = sbuf;
 985
 986                 ok = mode_fn(ctx, private_data, &smb_fname, &mode);
 987                 if (!ok) {
 988                         TALLOC_FREE(dname);
 989                         TALLOC_FREE(fname);
 990                         TALLOC_FREE(pathreal);
 991                         continue;
 992                 }
 993
 994                 if (!dir_check_ftype(conn, mode, dirtype)) {
 995                         DEBUG(5,("[%s] attribs 0x%x didn't match 0x%x\n",
 996                                 fname, (unsigned int)mode, (unsigned int)dirtype));
 997                         TALLOC_FREE(dname);
 998                         TALLOC_FREE(fname);
 999                         TALLOC_FREE(pathreal);
1000                         continue;
1001                 }
1002
1003                 if (ask_sharemode) {
1004                         struct timespec write_time_ts;
1005                         struct file_id fileid;
1006
1007                         fileid = vfs_file_id_from_sbuf(conn,
1008                                                        &smb_fname.st);
1009                         get_file_infos(fileid, 0, NULL, &write_time_ts);
1010                         if (!null_timespec(write_time_ts)) {
1011                                 update_stat_ex_mtime(&smb_fname.st,
1012                                                      write_time_ts);
1013                         }
1014                 }
1015
1016                 DEBUG(3,("smbd_dirptr_get_entry mask=[%s] found %s "
1017                         "fname=%s (%s)\n",
1018                         mask, smb_fname_str_dbg(&smb_fname),
1019                         dname, fname));
1020
1021                 DirCacheAdd(dirptr->dir_hnd, dname, cur_offset);
1022
1023                 TALLOC_FREE(dname);
1024
1025                 status = copy_smb_filename(ctx, &smb_fname, _smb_fname);
1026                 TALLOC_FREE(pathreal);
1027                 if (!NT_STATUS_IS_OK(status)) {
1028                         return false;
1029                 }
1030                 *_fname = fname;
1031                 *_mode = mode;
1032                 *_prev_offset = prev_offset;
1033
1034                 return true;
1035         }
1036
1037         return false;
1038 }
1039
1040 /****************************************************************************
1041  Get an 8.3 directory entry.
1042 ****************************************************************************/
1043
1044 static bool smbd_dirptr_8_3_match_fn(TALLOC_CTX *ctx,
1045                                      void *private_data,
1046                                      const char *dname,
1047                                      const char *mask,
1048                                      char **_fname)
1049 {
1050         connection_struct *conn = (connection_struct *)private_data;
1051
1052         if ((strcmp(mask,"*.*") == 0) ||
1053             mask_match_search(dname, mask, false) ||
1054             mangle_mask_match(conn, dname, mask)) {
1055                 char mname[13];
1056                 const char *fname;
1057
1058                 if (!mangle_is_8_3(dname, false, conn->params)) {
1059                         bool ok = name_to_8_3(dname, mname, false,
1060                                               conn->params);
1061                         if (!ok) {
1062                                 return false;
1063                         }
1064                         fname = mname;
1065                 } else {
1066                         fname = dname;
1067                 }
1068
1069                 *_fname = talloc_strdup(ctx, fname);
1070                 if (*_fname == NULL) {
1071                         return false;
1072                 }
1073
1074                 return true;
1075         }
1076
1077         return false;
1078 }
1079
1080 static bool smbd_dirptr_8_3_mode_fn(TALLOC_CTX *ctx,
1081                                     void *private_data,
1082                                     struct smb_filename *smb_fname,
1083                                     uint32_t *_mode)
1084 {
1085         connection_struct *conn = (connection_struct *)private_data;
1086
1087         if (!VALID_STAT(smb_fname->st)) {
1088                 if ((SMB_VFS_STAT(conn, smb_fname)) != 0) {
1089                         DEBUG(5,("smbd_dirptr_8_3_mode_fn: "
1090                                  "Couldn't stat [%s]. Error "
1091                                  "= %s\n",
1092                                  smb_fname_str_dbg(smb_fname),
1093                                  strerror(errno)));
1094                         return false;
1095                 }
1096         }
1097
1098         *_mode = dos_mode(conn, smb_fname);
1099         return true;
1100 }
1101
1102 bool get_dir_entry(TALLOC_CTX *ctx,
1103                 struct dptr_struct *dirptr,
1104                 const char *mask,
1105                 uint32_t dirtype,
1106                 char **_fname,
1107                 SMB_OFF_T *_size,
1108                 uint32_t *_mode,
1109                 struct timespec *_date,
1110                 bool check_descend,
1111                 bool ask_sharemode)
1112 {
1113         connection_struct *conn = dirptr->conn;
1114         char *fname = NULL;
1115         struct smb_filename *smb_fname = NULL;
1116         uint32_t mode = 0;
1117         long prev_offset;
1118         bool ok;
1119
1120         ok = smbd_dirptr_get_entry(ctx,
1121                                    dirptr,
1122                                    mask,
1123                                    dirtype,
1124                                    check_descend,
1125                                    ask_sharemode,
1126                                    smbd_dirptr_8_3_match_fn,
1127                                    smbd_dirptr_8_3_mode_fn,
1128                                    conn,
1129                                    &fname,
1130                                    &smb_fname,
1131                                    &mode,
1132                                    &prev_offset);
1133         if (!ok) {
1134                 return false;
1135         }
1136
1137         *_fname = talloc_move(ctx, &fname);
1138         *_size = smb_fname->st.st_ex_size;
1139         *_mode = mode;
1140         *_date = smb_fname->st.st_ex_mtime;
1141         TALLOC_FREE(smb_fname);
1142         return true;
1143 }
1144
1145 /*******************************************************************
1146  Check to see if a user can read a file. This is only approximate,
1147  it is used as part of the "hide unreadable" option. Don't
1148  use it for anything security sensitive.
1149 ********************************************************************/
1150
1151 static bool user_can_read_file(connection_struct *conn,
1152                                struct smb_filename *smb_fname)
1153 {
1154         /*
1155          * Never hide files from the root user.
1156          * We use (uid_t)0 here not sec_initial_uid()
1157          * as make test uses a single user context.
1158          */
1159
1160         if (get_current_uid(conn) == (uid_t)0) {
1161                 return True;
1162         }
1163
1164         return can_access_file_acl(conn, smb_fname, FILE_READ_DATA);
1165 }
1166
1167 /*******************************************************************
1168  Check to see if a user can write a file (and only files, we do not
1169  check dirs on this one). This is only approximate,
1170  it is used as part of the "hide unwriteable" option. Don't
1171  use it for anything security sensitive.
1172 ********************************************************************/
1173
1174 static bool user_can_write_file(connection_struct *conn,
1175                                 const struct smb_filename *smb_fname)
1176 {
1177         /*
1178          * Never hide files from the root user.
1179          * We use (uid_t)0 here not sec_initial_uid()
1180          * as make test uses a single user context.
1181          */
1182
1183         if (get_current_uid(conn) == (uid_t)0) {
1184                 return True;
1185         }
1186
1187         SMB_ASSERT(VALID_STAT(smb_fname->st));
1188
1189         /* Pseudo-open the file */
1190
1191         if(S_ISDIR(smb_fname->st.st_ex_mode)) {
1192                 return True;
1193         }
1194
1195         return can_write_to_file(conn, smb_fname);
1196 }
1197
1198 /*******************************************************************
1199   Is a file a "special" type ?
1200 ********************************************************************/
1201
1202 static bool file_is_special(connection_struct *conn,
1203                             const struct smb_filename *smb_fname)
1204 {
1205         /*
1206          * Never hide files from the root user.
1207          * We use (uid_t)0 here not sec_initial_uid()
1208          * as make test uses a single user context.
1209          */
1210
1211         if (get_current_uid(conn) == (uid_t)0) {
1212                 return False;
1213         }
1214
1215         SMB_ASSERT(VALID_STAT(smb_fname->st));
1216
1217         if (S_ISREG(smb_fname->st.st_ex_mode) ||
1218             S_ISDIR(smb_fname->st.st_ex_mode) ||
1219             S_ISLNK(smb_fname->st.st_ex_mode))
1220                 return False;
1221
1222         return True;
1223 }
1224
1225 /*******************************************************************
1226  Should the file be seen by the client?
1227  NOTE: A successful return is no guarantee of the file's existence.
1228 ********************************************************************/
1229
1230 bool is_visible_file(connection_struct *conn, const char *dir_path,
1231                      const char *name, SMB_STRUCT_STAT *pst, bool use_veto)
1232 {
1233         bool hide_unreadable = lp_hideunreadable(SNUM(conn));
1234         bool hide_unwriteable = lp_hideunwriteable_files(SNUM(conn));
1235         bool hide_special = lp_hide_special_files(SNUM(conn));
1236         char *entry = NULL;
1237         struct smb_filename *smb_fname_base = NULL;
1238         NTSTATUS status;
1239         bool ret = false;
1240
1241         if ((strcmp(".",name) == 0) || (strcmp("..",name) == 0)) {
1242                 return True; /* . and .. are always visible. */
1243         }
1244
1245         /* If it's a vetoed file, pretend it doesn't even exist */
1246         if (use_veto && IS_VETO_PATH(conn, name)) {
1247                 DEBUG(10,("is_visible_file: file %s is vetoed.\n", name ));
1248                 return False;
1249         }
1250
1251         if (hide_unreadable || hide_unwriteable || hide_special) {
1252                 entry = talloc_asprintf(talloc_tos(), "%s/%s", dir_path, name);
1253                 if (!entry) {
1254                         ret = false;
1255                         goto out;
1256                 }
1257
1258                 /* Create an smb_filename with stream_name == NULL. */
1259                 status = create_synthetic_smb_fname(talloc_tos(), entry, NULL,
1260                                                     pst, &smb_fname_base);
1261                 if (!NT_STATUS_IS_OK(status)) {
1262                         ret = false;
1263                         goto out;
1264                 }
1265
1266                 /* If the file name does not exist, there's no point checking
1267                  * the configuration options. We succeed, on the basis that the
1268                  * checks *might* have passed if the file was present.
1269                  */
1270                 if (!VALID_STAT(*pst)) {
1271                         if (SMB_VFS_STAT(conn, smb_fname_base) != 0) {
1272                                 ret = true;
1273                                 goto out;
1274                         } else {
1275                                 *pst = smb_fname_base->st;
1276                         }
1277                 }
1278
1279                 /* Honour _hide unreadable_ option */
1280                 if (hide_unreadable &&
1281                     !user_can_read_file(conn, smb_fname_base)) {
1282                         DEBUG(10,("is_visible_file: file %s is unreadable.\n",
1283                                  entry ));
1284                         ret = false;
1285                         goto out;
1286                 }
1287                 /* Honour _hide unwriteable_ option */
1288                 if (hide_unwriteable && !user_can_write_file(conn,
1289                                                              smb_fname_base)) {
1290                         DEBUG(10,("is_visible_file: file %s is unwritable.\n",
1291                                  entry ));
1292                         ret = false;
1293                         goto out;
1294                 }
1295                 /* Honour _hide_special_ option */
1296                 if (hide_special && file_is_special(conn, smb_fname_base)) {
1297                         DEBUG(10,("is_visible_file: file %s is special.\n",
1298                                  entry ));
1299                         ret = false;
1300                         goto out;
1301                 }
1302         }
1303
1304         ret = true;
1305  out:
1306         TALLOC_FREE(smb_fname_base);
1307         TALLOC_FREE(entry);
1308         return ret;
1309 }
1310
1311 static int smb_Dir_destructor(struct smb_Dir *dirp)
1312 {
1313         if (dirp->dir) {
1314                 SMB_VFS_CLOSEDIR(dirp->conn,dirp->dir);
1315         }
1316         if (dirp->conn->sconn) {
1317                 dirp->conn->sconn->smb1.searches.dirhandles_open--;
1318         }
1319         return 0;
1320 }
1321
1322 /*******************************************************************
1323  Open a directory.
1324 ********************************************************************/
1325
1326 struct smb_Dir *OpenDir(TALLOC_CTX *mem_ctx, connection_struct *conn,
1327                         const char *name,
1328                         const char *mask,
1329                         uint32 attr)
1330 {
1331         struct smb_Dir *dirp = TALLOC_ZERO_P(mem_ctx, struct smb_Dir);
1332         struct smbd_server_connection *sconn = conn->sconn;
1333
1334         if (!dirp) {
1335                 return NULL;
1336         }
1337
1338         dirp->conn = conn;
1339         dirp->name_cache_size = lp_directory_name_cache_size(SNUM(conn));
1340
1341         dirp->dir_path = talloc_strdup(dirp, name);
1342         if (!dirp->dir_path) {
1343                 errno = ENOMEM;
1344                 goto fail;
1345         }
1346
1347         if (sconn) {
1348                 sconn->smb1.searches.dirhandles_open++;
1349         }
1350         talloc_set_destructor(dirp, smb_Dir_destructor);
1351
1352         dirp->dir = SMB_VFS_OPENDIR(conn, dirp->dir_path, mask, attr);
1353         if (!dirp->dir) {
1354                 DEBUG(5,("OpenDir: Can't open %s. %s\n", dirp->dir_path,
1355                          strerror(errno) ));
1356                 goto fail;
1357         }
1358
1359         return dirp;
1360
1361   fail:
1362         TALLOC_FREE(dirp);
1363         return NULL;
1364 }
1365
1366 /*******************************************************************
1367  Open a directory from an fsp.
1368 ********************************************************************/
1369
1370 static struct smb_Dir *OpenDir_fsp(TALLOC_CTX *mem_ctx, connection_struct *conn,
1371                         files_struct *fsp,
1372                         const char *mask,
1373                         uint32 attr)
1374 {
1375         struct smb_Dir *dirp = TALLOC_ZERO_P(mem_ctx, struct smb_Dir);
1376         struct smbd_server_connection *sconn = conn->sconn;
1377
1378         if (!dirp) {
1379                 return NULL;
1380         }
1381
1382         dirp->conn = conn;
1383         dirp->name_cache_size = lp_directory_name_cache_size(SNUM(conn));
1384
1385         dirp->dir_path = talloc_strdup(dirp, fsp->fsp_name->base_name);
1386         if (!dirp->dir_path) {
1387                 errno = ENOMEM;
1388                 goto fail;
1389         }
1390
1391         if (sconn) {
1392                 sconn->smb1.searches.dirhandles_open++;
1393         }
1394         talloc_set_destructor(dirp, smb_Dir_destructor);
1395
1396         if (fsp->is_directory && fsp->fh->fd != -1) {
1397                 dirp->dir = SMB_VFS_FDOPENDIR(fsp, mask, attr);
1398                 if (dirp->dir == NULL) {
1399                         DEBUG(10,("OpenDir_fsp: SMB_VFS_FDOPENDIR on %s returned "
1400                                 "NULL (%s)\n",
1401                                 dirp->dir_path,
1402                                 strerror(errno)));
1403                         if (errno != ENOSYS) {
1404                                 return NULL;
1405                         }
1406                 }
1407         }
1408
1409         if (dirp->dir == NULL) {
1410                 /* FDOPENDIR didn't work. Use OPENDIR instead. */
1411                 dirp->dir = SMB_VFS_OPENDIR(conn, dirp->dir_path, mask, attr);
1412         }
1413
1414         if (!dirp->dir) {
1415                 DEBUG(5,("OpenDir_fsp: Can't open %s. %s\n", dirp->dir_path,
1416                          strerror(errno) ));
1417                 goto fail;
1418         }
1419
1420         return dirp;
1421
1422   fail:
1423         TALLOC_FREE(dirp);
1424         return NULL;
1425 }
1426
1427
1428 /*******************************************************************
1429  Read from a directory.
1430  Return directory entry, current offset, and optional stat information.
1431  Don't check for veto or invisible files.
1432 ********************************************************************/
1433
1434 const char *ReadDirName(struct smb_Dir *dirp, long *poffset,
1435                         SMB_STRUCT_STAT *sbuf, char **ptalloced)
1436 {
1437         const char *n;
1438         char *talloced = NULL;
1439         connection_struct *conn = dirp->conn;
1440
1441         /* Cheat to allow . and .. to be the first entries returned. */
1442         if (((*poffset == START_OF_DIRECTORY_OFFSET) ||
1443              (*poffset == DOT_DOT_DIRECTORY_OFFSET)) && (dirp->file_number < 2))
1444         {
1445                 if (dirp->file_number == 0) {
1446                         n = ".";
1447                         *poffset = dirp->offset = START_OF_DIRECTORY_OFFSET;
1448                 } else {
1449                         n = "..";
1450                         *poffset = dirp->offset = DOT_DOT_DIRECTORY_OFFSET;
1451                 }
1452                 dirp->file_number++;
1453                 *ptalloced = NULL;
1454                 return n;
1455         } else if (*poffset == END_OF_DIRECTORY_OFFSET) {
1456                 *poffset = dirp->offset = END_OF_DIRECTORY_OFFSET;
1457                 return NULL;
1458         } else {
1459                 /* A real offset, seek to it. */
1460                 SeekDir(dirp, *poffset);
1461         }
1462
1463         while ((n = vfs_readdirname(conn, dirp->dir, sbuf, &talloced))) {
1464                 /* Ignore . and .. - we've already returned them. */
1465                 if (*n == '.') {
1466                         if ((n[1] == '\0') || (n[1] == '.' && n[2] == '\0')) {
1467                                 TALLOC_FREE(talloced);
1468                                 continue;
1469                         }
1470                 }
1471                 *poffset = dirp->offset = SMB_VFS_TELLDIR(conn, dirp->dir);
1472                 *ptalloced = talloced;
1473                 dirp->file_number++;
1474                 return n;
1475         }
1476         *poffset = dirp->offset = END_OF_DIRECTORY_OFFSET;
1477         *ptalloced = NULL;
1478         return NULL;
1479 }
1480
1481 /*******************************************************************
1482  Rewind to the start.
1483 ********************************************************************/
1484
1485 void RewindDir(struct smb_Dir *dirp, long *poffset)
1486 {
1487         SMB_VFS_REWINDDIR(dirp->conn, dirp->dir);
1488         dirp->file_number = 0;
1489         dirp->offset = START_OF_DIRECTORY_OFFSET;
1490         *poffset = START_OF_DIRECTORY_OFFSET;
1491 }
1492
1493 /*******************************************************************
1494  Seek a dir.
1495 ********************************************************************/
1496
1497 void SeekDir(struct smb_Dir *dirp, long offset)
1498 {
1499         if (offset != dirp->offset) {
1500                 if (offset == START_OF_DIRECTORY_OFFSET) {
1501                         RewindDir(dirp, &offset);
1502                         /*
1503                          * Ok we should really set the file number here
1504                          * to 1 to enable ".." to be returned next. Trouble
1505                          * is I'm worried about callers using SeekDir(dirp,0)
1506                          * as equivalent to RewindDir(). So leave this alone
1507                          * for now.
1508                          */
1509                 } else if  (offset == DOT_DOT_DIRECTORY_OFFSET) {
1510                         RewindDir(dirp, &offset);
1511                         /*
1512                          * Set the file number to 2 - we want to get the first
1513                          * real file entry (the one we return after "..")
1514                          * on the next ReadDir.
1515                          */
1516                         dirp->file_number = 2;
1517                 } else if (offset == END_OF_DIRECTORY_OFFSET) {
1518                         ; /* Don't seek in this case. */
1519                 } else {
1520                         SMB_VFS_SEEKDIR(dirp->conn, dirp->dir, offset);
1521                 }
1522                 dirp->offset = offset;
1523         }
1524 }
1525
1526 /*******************************************************************
1527  Tell a dir position.
1528 ********************************************************************/
1529
1530 long TellDir(struct smb_Dir *dirp)
1531 {
1532         return(dirp->offset);
1533 }
1534
1535 /*******************************************************************
1536  Add an entry into the dcache.
1537 ********************************************************************/
1538
1539 void DirCacheAdd(struct smb_Dir *dirp, const char *name, long offset)
1540 {
1541         struct name_cache_entry *e;
1542
1543         if (dirp->name_cache_size == 0) {
1544                 return;
1545         }
1546
1547         if (dirp->name_cache == NULL) {
1548                 dirp->name_cache = TALLOC_ZERO_ARRAY(
1549                         dirp, struct name_cache_entry, dirp->name_cache_size);
1550
1551                 if (dirp->name_cache == NULL) {
1552                         return;
1553                 }
1554         }
1555
1556         dirp->name_cache_index = (dirp->name_cache_index+1) %
1557                                         dirp->name_cache_size;
1558         e = &dirp->name_cache[dirp->name_cache_index];
1559         TALLOC_FREE(e->name);
1560         e->name = talloc_strdup(dirp, name);
1561         e->offset = offset;
1562 }
1563
1564 /*******************************************************************
1565  Find an entry by name. Leave us at the offset after it.
1566  Don't check for veto or invisible files.
1567 ********************************************************************/
1568
1569 bool SearchDir(struct smb_Dir *dirp, const char *name, long *poffset)
1570 {
1571         int i;
1572         const char *entry = NULL;
1573         char *talloced = NULL;
1574         connection_struct *conn = dirp->conn;
1575
1576         /* Search back in the name cache. */
1577         if (dirp->name_cache_size && dirp->name_cache) {
1578                 for (i = dirp->name_cache_index; i >= 0; i--) {
1579                         struct name_cache_entry *e = &dirp->name_cache[i];
1580                         if (e->name && (conn->case_sensitive ? (strcmp(e->name, name) == 0) : strequal(e->name, name))) {
1581                                 *poffset = e->offset;
1582                                 SeekDir(dirp, e->offset);
1583                                 return True;
1584                         }
1585                 }
1586                 for (i = dirp->name_cache_size - 1; i > dirp->name_cache_index; i--) {
1587                         struct name_cache_entry *e = &dirp->name_cache[i];
1588                         if (e->name && (conn->case_sensitive ? (strcmp(e->name, name) == 0) : strequal(e->name, name))) {
1589                                 *poffset = e->offset;
1590                                 SeekDir(dirp, e->offset);
1591                                 return True;
1592                         }
1593                 }
1594         }
1595
1596         /* Not found in the name cache. Rewind directory and start from scratch. */
1597         SMB_VFS_REWINDDIR(conn, dirp->dir);
1598         dirp->file_number = 0;
1599         *poffset = START_OF_DIRECTORY_OFFSET;
1600         while ((entry = ReadDirName(dirp, poffset, NULL, &talloced))) {
1601                 if (conn->case_sensitive ? (strcmp(entry, name) == 0) : strequal(entry, name)) {
1602                         TALLOC_FREE(talloced);
1603                         return True;
1604                 }
1605                 TALLOC_FREE(talloced);
1606         }
1607         return False;
1608 }
1609
1610 /*****************************************************************
1611  Is this directory empty ?
1612 *****************************************************************/
1613
1614 NTSTATUS can_delete_directory(struct connection_struct *conn,
1615                                 const char *dirname)
1616 {
1617         NTSTATUS status = NT_STATUS_OK;
1618         long dirpos = 0;
1619         const char *dname = NULL;
1620         char *talloced = NULL;
1621         SMB_STRUCT_STAT st;
1622         struct smb_Dir *dir_hnd = OpenDir(talloc_tos(), conn,
1623                                         dirname, NULL, 0);
1624
1625         if (!dir_hnd) {
1626                 return map_nt_error_from_unix(errno);
1627         }
1628
1629         while ((dname = ReadDirName(dir_hnd, &dirpos, &st, &talloced))) {
1630                 /* Quick check for "." and ".." */
1631                 if (dname[0] == '.') {
1632                         if (!dname[1] || (dname[1] == '.' && !dname[2])) {
1633                                 TALLOC_FREE(talloced);
1634                                 continue;
1635                         }
1636                 }
1637
1638                 if (!is_visible_file(conn, dirname, dname, &st, True)) {
1639                         TALLOC_FREE(talloced);
1640                         continue;
1641                 }
1642
1643                 DEBUG(10,("can_delete_directory: got name %s - can't delete\n",
1644                          dname ));
1645                 status = NT_STATUS_DIRECTORY_NOT_EMPTY;
1646                 break;
1647         }
1648         TALLOC_FREE(talloced);
1649         TALLOC_FREE(dir_hnd);
1650
1651         return status;
1652 }