source/smbd/dir.c

   1 /*
   2    Unix SMB/Netbios implementation.
   3    Version 1.9.
   4    Directory handling routines
   5    Copyright (C) Andrew Tridgell 1992-1998
   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 2 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, write to the Free Software
  19    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  20 */
  21
  22 #include "includes.h"
  23
  24 /*
  25    This module implements directory related functions for Samba.
  26 */
  27
  28 typedef struct _dptr_struct {
  29         struct _dptr_struct *next, *prev;
  30         int dnum;
  31         uint16 spid;
  32         connection_struct *conn;
  33         void *ptr;
  34         BOOL expect_close;
  35         char *wcard; /* Field only used for trans2_ searches */
  36         uint16 attr; /* Field only used for trans2_ searches */
  37         char *path;
  38 } dptr_struct;
  39
  40 static struct bitmap *dptr_bmap;
  41 static dptr_struct *dirptrs;
  42
  43 static int dptrs_open = 0;
  44
  45 #define INVALID_DPTR_KEY (-3)
  46
  47 /****************************************************************************
  48  Initialise the dir bitmap.
  49 ****************************************************************************/
  50
  51 void init_dptrs(void)
  52 {
  53   static BOOL dptrs_init=False;
  54
  55   if (dptrs_init)
  56     return;
  57
  58   dptr_bmap = bitmap_allocate(MAX_DIRECTORY_HANDLES);
  59
  60   if (!dptr_bmap)
  61     exit_server("out of memory in init_dptrs\n");
  62
  63   dptrs_init = True;
  64 }
  65
  66 /****************************************************************************
  67  Idle a dptr - the directory is closed but the control info is kept.
  68 ****************************************************************************/
  69
  70 static void dptr_idle(dptr_struct *dptr)
  71 {
  72   if (dptr->ptr) {
  73     DEBUG(4,("Idling dptr dnum %d\n",dptr->dnum));
  74     dptrs_open--;
  75     CloseDir(dptr->ptr);
  76     dptr->ptr = NULL;
  77   }
  78 }
  79
  80 /****************************************************************************
  81  Idle the oldest dptr.
  82 ****************************************************************************/
  83
  84 static void dptr_idleoldest(void)
  85 {
  86   dptr_struct *dptr;
  87
  88   /*
  89    * Go to the end of the list.
  90    */
  91   for(dptr = dirptrs; dptr && dptr->next; dptr = dptr->next)
  92     ;
  93
  94   if(!dptr) {
  95     DEBUG(0,("No dptrs available to idle ?\n"));
  96     return;
  97   }
  98
  99   /*
 100    * Idle the oldest pointer.
 101    */
 102
 103   for(; dptr; dptr = dptr->prev) {
 104     if (dptr->ptr) {
 105       dptr_idle(dptr);
 106       return;
 107     }
 108   }
 109 }
 110
 111 /****************************************************************************
 112  Get the dptr_struct for a dir index.
 113 ****************************************************************************/
 114
 115 static dptr_struct *dptr_get(int key, BOOL forclose)
 116 {
 117   dptr_struct *dptr;
 118
 119   for(dptr = dirptrs; dptr; dptr = dptr->next) {
 120     if(dptr->dnum == key) {
 121       if (!forclose && !dptr->ptr) {
 122         if (dptrs_open >= MAX_OPEN_DIRECTORIES)
 123           dptr_idleoldest();
 124         DEBUG(4,("Reopening dptr key %d\n",key));
 125         if ((dptr->ptr = OpenDir(dptr->conn, dptr->path, True)))
 126           dptrs_open++;
 127       }
 128       DLIST_PROMOTE(dirptrs,dptr);
 129       return dptr;
 130     }
 131   }
 132   return(NULL);
 133 }
 134
 135 /****************************************************************************
 136  Get the dptr ptr for a dir index.
 137 ****************************************************************************/
 138
 139 static void *dptr_ptr(int key)
 140 {
 141   dptr_struct *dptr = dptr_get(key, False);
 142
 143   if (dptr)
 144     return(dptr->ptr);
 145   return(NULL);
 146 }
 147
 148 /****************************************************************************
 149  Get the dir path for a dir index.
 150 ****************************************************************************/
 151
 152 char *dptr_path(int key)
 153 {
 154   dptr_struct *dptr = dptr_get(key, False);
 155
 156   if (dptr)
 157     return(dptr->path);
 158   return(NULL);
 159 }
 160
 161 /****************************************************************************
 162  Get the dir wcard for a dir index (lanman2 specific).
 163 ****************************************************************************/
 164
 165 char *dptr_wcard(int key)
 166 {
 167   dptr_struct *dptr = dptr_get(key, False);
 168
 169   if (dptr)
 170     return(dptr->wcard);
 171   return(NULL);
 172 }
 173
 174 /****************************************************************************
 175  Set the dir wcard for a dir index (lanman2 specific).
 176  Returns 0 on ok, 1 on fail.
 177 ****************************************************************************/
 178
 179 BOOL dptr_set_wcard(int key, char *wcard)
 180 {
 181   dptr_struct *dptr = dptr_get(key, False);
 182
 183   if (dptr) {
 184     dptr->wcard = wcard;
 185     return True;
 186   }
 187   return False;
 188 }
 189
 190 /****************************************************************************
 191  Set the dir attrib for a dir index (lanman2 specific).
 192  Returns 0 on ok, 1 on fail.
 193 ****************************************************************************/
 194
 195 BOOL dptr_set_attr(int key, uint16 attr)
 196 {
 197   dptr_struct *dptr = dptr_get(key, False);
 198
 199   if (dptr) {
 200     dptr->attr = attr;
 201     return True;
 202   }
 203   return False;
 204 }
 205
 206 /****************************************************************************
 207  Get the dir attrib for a dir index (lanman2 specific)
 208 ****************************************************************************/
 209
 210 uint16 dptr_attr(int key)
 211 {
 212   dptr_struct *dptr = dptr_get(key, False);
 213
 214   if (dptr)
 215     return(dptr->attr);
 216   return(0);
 217 }
 218
 219 /****************************************************************************
 220  Close a dptr (internal func).
 221 ****************************************************************************/
 222
 223 static void dptr_close_internal(dptr_struct *dptr)
 224 {
 225   DEBUG(4,("closing dptr key %d\n",dptr->dnum));
 226
 227   DLIST_REMOVE(dirptrs, dptr);
 228
 229   /*
 230    * Free the dnum in the bitmap. Remember the dnum value is always
 231    * biased by one with respect to the bitmap.
 232    */
 233
 234   if(bitmap_query( dptr_bmap, dptr->dnum - 1) != True) {
 235     DEBUG(0,("dptr_close_internal : Error - closing dnum = %d and bitmap not set !\n",
 236                         dptr->dnum ));
 237   }
 238
 239   bitmap_clear(dptr_bmap, dptr->dnum - 1);
 240
 241   if (dptr->ptr) {
 242     CloseDir(dptr->ptr);
 243     dptrs_open--;
 244   }
 245
 246   /* Lanman 2 specific code */
 247   SAFE_FREE(dptr->wcard);
 248   string_set(&dptr->path,"");
 249   SAFE_FREE(dptr);
 250 }
 251
 252 /****************************************************************************
 253  Close a dptr given a key.
 254 ****************************************************************************/
 255
 256 void dptr_close(int *key)
 257 {
 258   dptr_struct *dptr;
 259
 260   if(*key == INVALID_DPTR_KEY)
 261     return;
 262
 263   /* OS/2 seems to use -1 to indicate "close all directories" */
 264   if (*key == -1) {
 265     dptr_struct *next;
 266     for(dptr = dirptrs; dptr; dptr = next) {
 267       next = dptr->next;
 268       dptr_close_internal(dptr);
 269     }
 270     *key = INVALID_DPTR_KEY;
 271     return;
 272   }
 273
 274   dptr = dptr_get(*key, True);
 275
 276   if (!dptr) {
 277     DEBUG(0,("Invalid key %d given to dptr_close\n", *key));
 278     return;
 279   }
 280
 281   dptr_close_internal(dptr);
 282
 283   *key = INVALID_DPTR_KEY;
 284 }
 285
 286 /****************************************************************************
 287  Close all dptrs for a cnum.
 288 ****************************************************************************/
 289
 290 void dptr_closecnum(connection_struct *conn)
 291 {
 292   dptr_struct *dptr, *next;
 293   for(dptr = dirptrs; dptr; dptr = next) {
 294     next = dptr->next;
 295     if (dptr->conn == conn)
 296       dptr_close_internal(dptr);
 297   }
 298 }
 299
 300 /****************************************************************************
 301  Idle all dptrs for a cnum.
 302 ****************************************************************************/
 303
 304 void dptr_idlecnum(connection_struct *conn)
 305 {
 306   dptr_struct *dptr;
 307   for(dptr = dirptrs; dptr; dptr = dptr->next) {
 308     if (dptr->conn == conn && dptr->ptr)
 309       dptr_idle(dptr);
 310   }
 311 }
 312
 313 /****************************************************************************
 314  Close a dptr that matches a given path, only if it matches the spid also.
 315 ****************************************************************************/
 316
 317 void dptr_closepath(char *path,uint16 spid)
 318 {
 319   dptr_struct *dptr, *next;
 320   for(dptr = dirptrs; dptr; dptr = next) {
 321     next = dptr->next;
 322     if (spid == dptr->spid && strequal(dptr->path,path))
 323       dptr_close_internal(dptr);
 324   }
 325 }
 326
 327 /****************************************************************************
 328  Start a directory listing.
 329 ****************************************************************************/
 330
 331 static BOOL start_dir(connection_struct *conn,char *directory)
 332 {
 333   const char *dir2;
 334
 335   DEBUG(5,("start_dir dir=%s\n",directory));
 336
 337   if (!check_name(directory,conn))
 338     return(False);
 339
 340   if (! *directory)
 341     dir2 = ".";
 342   else
 343     dir2 = directory;
 344
 345   conn->dirptr = OpenDir(conn, dir2, True);
 346   if (conn->dirptr) {
 347     dptrs_open++;
 348     string_set(&conn->dirpath,dir2);
 349     return(True);
 350   }
 351
 352   return(False);
 353 }
 354
 355 /****************************************************************************
 356  Try and close the oldest handle not marked for
 357  expect close in the hope that the client has
 358  finished with that one.
 359 ****************************************************************************/
 360
 361 static void dptr_close_oldest(BOOL old)
 362 {
 363   dptr_struct *dptr;
 364
 365   /*
 366    * Go to the end of the list.
 367    */
 368   for(dptr = dirptrs; dptr && dptr->next; dptr = dptr->next)
 369     ;
 370
 371   if(!dptr) {
 372     DEBUG(0,("No old dptrs available to close oldest ?\n"));
 373     return;
 374   }
 375
 376   /*
 377    * If 'old' is true, close the oldest oldhandle dnum (ie. 1 < dnum < 256) that
 378    * does not have expect_close set. If 'old' is false, close
 379    * one of the new dnum handles.
 380    */
 381
 382   for(; dptr; dptr = dptr->prev) {
 383     if ((old && (dptr->dnum < 256) && !dptr->expect_close) ||
 384         (!old && (dptr->dnum > 255))) {
 385       dptr_close_internal(dptr);
 386       return;
 387     }
 388   }
 389 }
 390
 391 /****************************************************************************
 392  Create a new dir ptr. If the flag old_handle is true then we must allocate
 393  from the bitmap range 0 - 255 as old SMBsearch directory handles are only
 394  one byte long. If old_handle is false we allocate from the range
 395  256 - MAX_DIRECTORY_HANDLES. We bias the number we return by 1 to ensure
 396  a directory handle is never zero. All the above is folklore taught to
 397  me at Andrew's knee.... :-) :-). JRA.
 398 ****************************************************************************/
 399
 400 int dptr_create(connection_struct *conn,char *path, BOOL old_handle, BOOL expect_close,uint16 spid)
 401 {
 402   dptr_struct *dptr;
 403
 404   if (!start_dir(conn,path))
 405     return(-2); /* Code to say use a unix error return code. */
 406
 407   if (dptrs_open >= MAX_OPEN_DIRECTORIES)
 408     dptr_idleoldest();
 409
 410   dptr = (dptr_struct *)malloc(sizeof(dptr_struct));
 411   if(!dptr) {
 412     DEBUG(0,("malloc fail in dptr_create.\n"));
 413     return -1;
 414   }
 415
 416   ZERO_STRUCTP(dptr);
 417
 418   if(old_handle) {
 419
 420     /*
 421      * This is an old-style SMBsearch request. Ensure the
 422      * value we return will fit in the range 1-255.
 423      */
 424
 425     dptr->dnum = bitmap_find(dptr_bmap, 0);
 426
 427     if(dptr->dnum == -1 || dptr->dnum > 254) {
 428
 429       /*
 430        * Try and close the oldest handle not marked for
 431        * expect close in the hope that the client has
 432        * finished with that one.
 433        */
 434
 435       dptr_close_oldest(True);
 436
 437       /* Now try again... */
 438       dptr->dnum = bitmap_find(dptr_bmap, 0);
 439
 440       if(dptr->dnum == -1 || dptr->dnum > 254) {
 441         DEBUG(0,("dptr_create: returned %d: Error - all old dirptrs in use ?\n", dptr->dnum));
 442         SAFE_FREE(dptr);
 443         return -1;
 444       }
 445     }
 446   } else {
 447
 448     /*
 449      * This is a new-style trans2 request. Allocate from
 450      * a range that will return 256 - MAX_DIRECTORY_HANDLES.
 451      */
 452
 453     dptr->dnum = bitmap_find(dptr_bmap, 255);
 454
 455     if(dptr->dnum == -1 || dptr->dnum < 255) {
 456
 457       /*
 458        * Try and close the oldest handle close in the hope that
 459        * the client has finished with that one. This will only
 460        * happen in the case of the Win98 client bug where it leaks
 461        * directory handles.
 462        */
 463
 464       dptr_close_oldest(False);
 465
 466       /* Now try again... */
 467       dptr->dnum = bitmap_find(dptr_bmap, 255);
 468
 469       if(dptr->dnum == -1 || dptr->dnum < 255) {
 470         DEBUG(0,("dptr_create: returned %d: Error - all new dirptrs in use ?\n", dptr->dnum));
 471         SAFE_FREE(dptr);
 472         return -1;
 473       }
 474     }
 475   }
 476
 477   bitmap_set(dptr_bmap, dptr->dnum);
 478
 479   dptr->dnum += 1; /* Always bias the dnum by one - no zero dnums allowed. */
 480
 481   dptr->ptr = conn->dirptr;
 482   string_set(&dptr->path,path);
 483   dptr->conn = conn;
 484   dptr->spid = spid;
 485   dptr->expect_close = expect_close;
 486   dptr->wcard = NULL; /* Only used in lanman2 searches */
 487   dptr->attr = 0; /* Only used in lanman2 searches */
 488
 489   DLIST_ADD(dirptrs, dptr);
 490
 491   DEBUG(3,("creating new dirptr %d for path %s, expect_close = %d\n",
 492            dptr->dnum,path,expect_close));
 493
 494   return(dptr->dnum);
 495 }
 496
 497 /****************************************************************************
 498  Fill the 5 byte server reserved dptr field.
 499 ****************************************************************************/
 500
 501 BOOL dptr_fill(char *buf1,unsigned int key)
 502 {
 503   unsigned char *buf = (unsigned char *)buf1;
 504   void *p = dptr_ptr(key);
 505   uint32 offset;
 506   if (!p) {
 507     DEBUG(1,("filling null dirptr %d\n",key));
 508     return(False);
 509   }
 510   offset = TellDir(p);
 511   DEBUG(6,("fill on key %u dirptr 0x%lx now at %d\n",key,
 512            (long)p,(int)offset));
 513   buf[0] = key;
 514   SIVAL(buf,1,offset | DPTR_MASK);
 515   return(True);
 516 }
 517
 518 /****************************************************************************
 519  Fetch the dir ptr and seek it given the 5 byte server field.
 520 ****************************************************************************/
 521
 522 void *dptr_fetch(char *buf,int *num)
 523 {
 524   unsigned int key = *(unsigned char *)buf;
 525   void *p = dptr_ptr(key);
 526   uint32 offset;
 527   if (!p) {
 528     DEBUG(3,("fetched null dirptr %d\n",key));
 529     return(NULL);
 530   }
 531   *num = key;
 532   offset = IVAL(buf,1)&~DPTR_MASK;
 533   SeekDir(p,offset);
 534   DEBUG(3,("fetching dirptr %d for path %s at offset %d\n",
 535            key,dptr_path(key),offset));
 536   return(p);
 537 }
 538
 539 /****************************************************************************
 540  Fetch the dir ptr.
 541 ****************************************************************************/
 542
 543 void *dptr_fetch_lanman2(int dptr_num)
 544 {
 545   void *p = dptr_ptr(dptr_num);
 546
 547   if (!p) {
 548     DEBUG(3,("fetched null dirptr %d\n",dptr_num));
 549     return(NULL);
 550   }
 551   DEBUG(3,("fetching dirptr %d for path %s\n",dptr_num,dptr_path(dptr_num)));
 552   return(p);
 553 }
 554
 555 /****************************************************************************
 556  Check a filetype for being valid.
 557 ****************************************************************************/
 558
 559 BOOL dir_check_ftype(connection_struct *conn,int mode,SMB_STRUCT_STAT *st,int dirtype)
 560 {
 561         int mask;
 562
 563         /* Check the "may have" search bits. */
 564         if (((mode & ~dirtype) & (aHIDDEN | aSYSTEM | aDIR)) != 0)
 565                 return False;
 566
 567         /* Check the "must have" bits, which are the may have bits shifted eight */
 568         /* If must have bit is set, the file/dir can not be returned in search unless the matching
 569                 file attribute is set */
 570         mask = ((dirtype >> 8) & (aDIR|aARCH|aRONLY|aHIDDEN|aSYSTEM)); /* & 0x37 */
 571         if(mask) {
 572                 if((mask & (mode & (aDIR|aARCH|aRONLY|aHIDDEN|aSYSTEM))) == mask)   /* check if matching attribute present */
 573                         return True;
 574                 else
 575                         return False;
 576         }
 577
 578         return True;
 579 }
 580
 581 static BOOL mangle_mask_match(connection_struct *conn, char *filename, char *mask)
 582 {
 583         mangle_map(filename,True,False,SNUM(conn));
 584         return mask_match(filename,mask,False);
 585 }
 586
 587 /****************************************************************************
 588  Get an 8.3 directory entry.
 589 ****************************************************************************/
 590
 591 BOOL get_dir_entry(connection_struct *conn,char *mask,int dirtype,char *fname,
 592                    SMB_OFF_T *size,int *mode,time_t *date,BOOL check_descend)
 593 {
 594   char *dname;
 595   BOOL found = False;
 596   SMB_STRUCT_STAT sbuf;
 597   pstring path;
 598   pstring pathreal;
 599   BOOL isrootdir;
 600   pstring filename;
 601   BOOL needslash;
 602
 603   *path = *pathreal = *filename = 0;
 604
 605   isrootdir = (strequal(conn->dirpath,"./") ||
 606                strequal(conn->dirpath,".") ||
 607                strequal(conn->dirpath,"/"));
 608
 609   needslash = ( conn->dirpath[strlen(conn->dirpath) -1] != '/');
 610
 611   if (!conn->dirptr)
 612     return(False);
 613
 614   while (!found)
 615   {
 616     dname = ReadDirName(conn->dirptr);
 617
 618     DEBUG(6,("readdir on dirptr 0x%lx now at offset %d\n",
 619           (long)conn->dirptr,TellDir(conn->dirptr)));
 620
 621     if (dname == NULL)
 622       return(False);
 623
 624     pstrcpy(filename,dname);
 625
 626     /* notice the special *.* handling. This appears to be the only difference
 627        between the wildcard handling in this routine and in the trans2 routines.
 628        see masktest for a demo
 629     */
 630     if ((strcmp(mask,"*.*") == 0) ||
 631         mask_match(filename,mask,False) ||
 632         mangle_mask_match(conn,filename,mask))
 633     {
 634       if (isrootdir && (strequal(filename,"..") || strequal(filename,".")))
 635         continue;
 636
 637       if (!mangle_is_8_3(filename, False)) {
 638               mangle_map(filename,True,False,SNUM(conn));
 639       }
 640
 641       pstrcpy(fname,filename);
 642       *path = 0;
 643       pstrcpy(path,conn->dirpath);
 644       if(needslash)
 645         pstrcat(path,"/");
 646       pstrcpy(pathreal,path);
 647       pstrcat(path,fname);
 648       pstrcat(pathreal,dname);
 649       if (conn->vfs_ops.stat(conn,dos_to_unix_static(pathreal), &sbuf) != 0)
 650       {
 651         DEBUG(5,("Couldn't stat 1 [%s]. Error = %s\n",path, strerror(errno) ));
 652         continue;
 653       }
 654
 655       *mode = dos_mode(conn,pathreal,&sbuf);
 656
 657       if (!dir_check_ftype(conn,*mode,&sbuf,dirtype))
 658       {
 659         DEBUG(5,("[%s] attribs didn't match %x\n",filename,dirtype));
 660         continue;
 661       }
 662
 663       *size = sbuf.st_size;
 664       *date = sbuf.st_mtime;
 665
 666       DEBUG(3,("get_dir_entry mask=[%s] found %s fname=%s\n",mask, pathreal,fname));
 667
 668       found = True;
 669     }
 670   }
 671
 672   return(found);
 673 }
 674
 675
 676
 677 typedef struct
 678 {
 679   int pos;
 680   int numentries;
 681   int mallocsize;
 682   char *data;
 683   char *current;
 684 } Dir;
 685
 686
 687
 688 /*******************************************************************
 689 check to see if a user can read a file. This is only approximate,
 690 it is used as part of the "hide unreadable" option. Don't
 691 use it for anything security sensitive
 692 ********************************************************************/
 693
 694 static BOOL user_can_read_file(connection_struct *conn, char *name)
 695 {
 696         extern struct current_user current_user;
 697         SMB_STRUCT_STAT ste;
 698         SEC_DESC *psd = NULL;
 699         size_t sd_size;
 700         files_struct *fsp;
 701         int smb_action;
 702         NTSTATUS status;
 703         uint32 access_granted;
 704
 705         ZERO_STRUCT(ste);
 706
 707         /*
 708          * If user is a member of the Admin group
 709          * we never hide files from them.
 710          */
 711
 712         if (conn->admin_user)
 713                 return True;
 714
 715         /* If we can't stat it does not show it */
 716         if (vfs_stat(conn, name, &ste) != 0)
 717                 return False;
 718
 719         /* Pseudo-open the file (note - no fd's created). */
 720
 721         if(S_ISDIR(ste.st_mode))
 722                  fsp = open_directory(conn, name, &ste, 0, SET_DENY_MODE(DENY_NONE), (FILE_FAIL_IF_NOT_EXIST|FILE_EXISTS_OPEN),
 723                         unix_mode(conn,aRONLY|aDIR, name), &smb_action);
 724         else
 725                 fsp = open_file_stat(conn, name, &ste);
 726
 727         if (!fsp)
 728                 return False;
 729
 730         /* Get NT ACL -allocated in main loop talloc context. No free needed here. */
 731         sd_size = conn->vfs_ops.fget_nt_acl(fsp, fsp->fd, &psd);
 732         close_file(fsp, True);
 733
 734         /* No access if SD get failed. */
 735         if (!sd_size)
 736                 return False;
 737
 738         return se_access_check(psd, current_user.nt_user_token, FILE_READ_DATA,
 739                                  &access_granted, &status);
 740 }
 741
 742 /*******************************************************************
 743  Open a directory.
 744 ********************************************************************/
 745
 746 void *OpenDir(connection_struct *conn, const char *name, BOOL use_veto)
 747 {
 748         Dir *dirp;
 749         const char *n;
 750         DIR *p = conn->vfs_ops.opendir(conn,dos_to_unix_static(name));
 751         int used=0;
 752
 753         if (!p)
 754                 return(NULL);
 755         dirp = (Dir *)malloc(sizeof(Dir));
 756         if (!dirp) {
 757                 DEBUG(0,("Out of memory in OpenDir\n"));
 758                 conn->vfs_ops.closedir(conn,p);
 759                 return(NULL);
 760         }
 761
 762         dirp->pos = dirp->numentries = dirp->mallocsize = 0;
 763         dirp->data = dirp->current = NULL;
 764
 765         while (True) {
 766                 int l;
 767                 BOOL normal_entry = True;
 768
 769                 if (used == 0) {
 770                         n = ".";
 771                         normal_entry = False;
 772                 } else if (used == 2) {
 773                         n = "..";
 774                         normal_entry = False;
 775                 } else {
 776                         n = vfs_readdirname(conn, p);
 777                         if (n == NULL)
 778                                 break;
 779                         if ((strcmp(".",n) == 0) ||(strcmp("..",n) == 0))
 780                                 continue;
 781                         normal_entry = True;
 782                 }
 783
 784                 l = strlen(n)+1;
 785
 786                 /* Return value of vfs_readdirname has already gone through
 787                         unix_to_dos() */
 788
 789                 /* If it's a vetoed file, pretend it doesn't even exist */
 790                 if (normal_entry && use_veto && conn && IS_VETO_PATH(conn, n))
 791                         continue;
 792
 793                 /* Honour _hide unreadable_ option */
 794                 if (normal_entry && conn && lp_hideunreadable(SNUM(conn))) {
 795                         char *entry;
 796                         int ret=0;
 797
 798                         if (asprintf(&entry, "%s/%s/%s", conn->origpath, name, n) > 0) {
 799                                 ret = user_can_read_file(conn, entry);
 800                                 SAFE_FREE(entry);
 801                         }
 802                         if (!ret)
 803                                 continue;
 804                 }
 805
 806                 if (used + l > dirp->mallocsize) {
 807                         int s = MAX(used+l,used+2000);
 808                         char *r;
 809                         r = (char *)Realloc(dirp->data,s);
 810                         if (!r) {
 811                                 DEBUG(0,("Out of memory in OpenDir\n"));
 812                                 break;
 813                                                                                         }
 814                         dirp->data = r;
 815                         dirp->mallocsize = s;
 816                         dirp->current = dirp->data;
 817                 }
 818                 pstrcpy(dirp->data+used,n);
 819                 used += l;
 820                 dirp->numentries++;
 821         }
 822
 823         conn->vfs_ops.closedir(conn,p);
 824         return((void *)dirp);
 825 }
 826
 827
 828 /*******************************************************************
 829  Close a directory.
 830 ********************************************************************/
 831
 832 void CloseDir(void *p)
 833 {
 834   Dir *dirp = (Dir *)p;
 835   if (!dirp) return;
 836   SAFE_FREE(dirp->data);
 837   SAFE_FREE(dirp);
 838 }
 839
 840 /*******************************************************************
 841  Read from a directory.
 842 ********************************************************************/
 843
 844 char *ReadDirName(void *p)
 845 {
 846   char *ret;
 847   Dir *dirp = (Dir *)p;
 848
 849   if (!dirp || !dirp->current || dirp->pos >= dirp->numentries) return(NULL);
 850
 851   ret = dirp->current;
 852   dirp->current = skip_string(dirp->current,1);
 853   dirp->pos++;
 854
 855   return(ret);
 856 }
 857
 858
 859 /*******************************************************************
 860  Seek a dir.
 861 ********************************************************************/
 862
 863 BOOL SeekDir(void *p,int pos)
 864 {
 865   Dir *dirp = (Dir *)p;
 866
 867   if (!dirp) return(False);
 868
 869   if (pos < dirp->pos) {
 870     dirp->current = dirp->data;
 871     dirp->pos = 0;
 872   }
 873
 874   while (dirp->pos < pos && ReadDirName(p)) ;
 875
 876   return(dirp->pos == pos);
 877 }
 878
 879 /*******************************************************************
 880  Tell a dir position.
 881 ********************************************************************/
 882
 883 int TellDir(void *p)
 884 {
 885   Dir *dirp = (Dir *)p;
 886
 887   if (!dirp) return(-1);
 888
 889   return(dirp->pos);
 890 }
 891
 892 /*******************************************************************************
 893  This section manages a global directory cache.
 894  (It should probably be split into a separate module.  crh)
 895 ********************************************************************************/
 896
 897 typedef struct {
 898   ubi_dlNode  node;
 899   char       *path;
 900   char       *name;
 901   char       *dname;
 902   int         snum;
 903 } dir_cache_entry;
 904
 905 static ubi_dlNewList( dir_cache );
 906
 907 /*****************************************************************************
 908  Add an entry to the directory cache.
 909  Input:  path  -
 910          name  -
 911          dname -
 912          snum  -
 913  Output: None.
 914 *****************************************************************************/
 915
 916 void DirCacheAdd( const char *path, const char *name, const char *dname, int snum )
 917 {
 918   int               pathlen;
 919   int               namelen;
 920   dir_cache_entry  *entry;
 921
 922   /* Allocate the structure & string space in one go so that it can be freed
 923    * in one call to free().
 924    */
 925   pathlen = strlen( path ) +1;  /* Bytes required to store path (with nul). */
 926   namelen = strlen( name ) +1;  /* Bytes required to store name (with nul). */
 927   entry = (dir_cache_entry *)malloc( sizeof( dir_cache_entry )
 928                                    + pathlen
 929                                    + namelen
 930                                    + strlen( dname ) +1 );
 931   if( NULL == entry )   /* Not adding to the cache is not fatal,  */
 932     return;             /* so just return as if nothing happened. */
 933
 934   /* Set pointers correctly and load values. */
 935         entry->path  = memcpy( (char *)&entry[1], path, strlen(path)+1 );
 936         entry->name  = memcpy( &(entry->path[pathlen]), name, strlen(name)+1 );
 937         entry->dname = memcpy( &(entry->name[namelen]), dname, strlen(dname)+1 );
 938   entry->snum  = snum;
 939
 940   /* Add the new entry to the linked list. */
 941   (void)ubi_dlAddHead( dir_cache, entry );
 942   DEBUG( 4, ("Added dir cache entry %s %s -> %s\n", path, name, dname ) );
 943
 944   /* Free excess cache entries. */
 945   while( DIRCACHESIZE < dir_cache->count )
 946     safe_free( ubi_dlRemTail( dir_cache ) );
 947
 948 }
 949
 950 /*****************************************************************************
 951  Search for an entry to the directory cache.
 952  Input:  path  -
 953          name  -
 954          snum  -
 955  Output: The dname string of the located entry, or NULL if the entry was
 956          not found.
 957
 958  Notes:  This uses a linear search, which is is okay because of
 959          the small size of the cache.  Use a splay tree or hash
 960          for large caches.
 961 *****************************************************************************/
 962
 963 char *DirCacheCheck( const char *path, const char *name, int snum )
 964 {
 965   dir_cache_entry *entry;
 966
 967   for( entry = (dir_cache_entry *)ubi_dlFirst( dir_cache );
 968        NULL != entry;
 969        entry = (dir_cache_entry *)ubi_dlNext( entry ) )
 970     {
 971     if( entry->snum == snum
 972         && entry->name && 0 == strcmp( name, entry->name )
 973         && entry->path && 0 == strcmp( path, entry->path ) )
 974       {
 975       DEBUG(4, ("Got dir cache hit on %s %s -> %s\n",path,name,entry->dname));
 976       return( entry->dname );
 977       }
 978     }
 979
 980   return(NULL);
 981 }
 982
 983 /*****************************************************************************
 984  Remove all cache entries which have an snum that matches the input.
 985  Input:  snum  -
 986  Output: None.
 987 *****************************************************************************/
 988
 989 void DirCacheFlush(int snum)
 990 {
 991         dir_cache_entry *entry;
 992         ubi_dlNodePtr    next;
 993
 994         for(entry = (dir_cache_entry *)ubi_dlFirst( dir_cache );
 995             NULL != entry; )  {
 996                 next = ubi_dlNext( entry );
 997                 if( entry->snum == snum )
 998                         safe_free( ubi_dlRemThis( dir_cache, entry ) );
 999                 entry = (dir_cache_entry *)next;
1000         }
1001 }