summaryrefslogtreecommitdiff
path: root/source3/smbd/dir.c
blob: 5b7b08b4760020159b513ee367be2216888922d2 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
/* 
   Unix SMB/Netbios implementation.
   Version 1.9.
   Directory handling routines
   Copyright (C) Andrew Tridgell 1992-1998
   
   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 2 of the License, or
   (at your option) any later version.
   
   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.
   
   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/

#include "includes.h"

extern int DEBUGLEVEL;

/*
   This module implements directory related functions for Samba.
*/



static uint32 dircounter = 0;


#define NUMDIRPTRS 256


static struct dptr_struct {
	int pid;
	connection_struct *conn;
	uint32 lastused;
	void *ptr;
	BOOL valid;
	BOOL finished;
	BOOL expect_close;
	char *wcard; /* Field only used for trans2_ searches */
	uint16 attr; /* Field only used for trans2_ searches */
	char *path;
}
dirptrs[NUMDIRPTRS];


static int dptrs_open = 0;

/****************************************************************************
initialise the dir array
****************************************************************************/
void init_dptrs(void)
{
  static BOOL dptrs_init=False;
  int i;

  if (dptrs_init) return;
  for (i=0;i<NUMDIRPTRS;i++)    
    {
      dirptrs[i].valid = False;
      dirptrs[i].wcard = NULL;
      dirptrs[i].ptr = NULL;
      string_init(&dirptrs[i].path,"");
    }
  dptrs_init = True;
}

/****************************************************************************
idle a dptr - the directory is closed but the control info is kept
****************************************************************************/
static void dptr_idle(int key)
{
  if (dirptrs[key].valid && dirptrs[key].ptr) {
    DEBUG(4,("Idling dptr key %d\n",key));
    dptrs_open--;
    CloseDir(dirptrs[key].ptr);
    dirptrs[key].ptr = NULL;
  }    
}

/****************************************************************************
idle the oldest dptr
****************************************************************************/
static void dptr_idleoldest(void)
{
  int i;
  uint32 old=dircounter+1;
  int oldi= -1;
  for (i=0;i<NUMDIRPTRS;i++)
    if (dirptrs[i].valid && dirptrs[i].ptr && dirptrs[i].lastused < old) {
      old = dirptrs[i].lastused;
      oldi = i;
    }
  if (oldi != -1)
    dptr_idle(oldi);
  else
    DEBUG(0,("No dptrs available to idle??\n"));
}

/****************************************************************************
get the dir ptr for a dir index
****************************************************************************/
static void *dptr_get(int key,uint32 lastused)
{
	struct dptr_struct *dp = &dirptrs[key];

	if (dp->valid) {
		if (lastused) dp->lastused = lastused;
		if (!dp->ptr) {
			if (dptrs_open >= MAX_OPEN_DIRECTORIES)
				dptr_idleoldest();
			DEBUG(4,("Reopening dptr key %d\n",key));
			if ((dp->ptr = OpenDir(dp->conn, dp->path, True)))
				dptrs_open++;
		}
		return(dp->ptr);
	}
	return(NULL);
}

/****************************************************************************
get the dir path for a dir index
****************************************************************************/
char *dptr_path(int key)
{
  if (dirptrs[key].valid)
    return(dirptrs[key].path);
  return(NULL);
}

/****************************************************************************
get the dir wcard for a dir index (lanman2 specific)
****************************************************************************/
char *dptr_wcard(int key)
{
  if (dirptrs[key].valid)
    return(dirptrs[key].wcard);
  return(NULL);
}

/****************************************************************************
set the dir wcard for a dir index (lanman2 specific)
Returns 0 on ok, 1 on fail.
****************************************************************************/
BOOL dptr_set_wcard(int key, char *wcard)
{
  if (dirptrs[key].valid) {
    dirptrs[key].wcard = wcard;
    return True;
  }
  return False;
}

/****************************************************************************
set the dir attrib for a dir index (lanman2 specific)
Returns 0 on ok, 1 on fail.
****************************************************************************/
BOOL dptr_set_attr(int key, uint16 attr)
{
  if (dirptrs[key].valid) {
    dirptrs[key].attr = attr;
    return True;
  }
  return False;
}

/****************************************************************************
get the dir attrib for a dir index (lanman2 specific)
****************************************************************************/
uint16 dptr_attr(int key)
{
  if (dirptrs[key].valid)
    return(dirptrs[key].attr);
  return(0);
}

/****************************************************************************
close a dptr
****************************************************************************/
void dptr_close(int key)
{
  /* OS/2 seems to use -1 to indicate "close all directories" */
  if (key == -1) {
    int i;
    for (i=0;i<NUMDIRPTRS;i++) 
      dptr_close(i);
    return;
  }

  if (key < 0 || key >= NUMDIRPTRS) {
    DEBUG(3,("Invalid key %d given to dptr_close\n",key));
    return;
  }

  if (dirptrs[key].valid) {
    DEBUG(4,("closing dptr key %d\n",key));
    if (dirptrs[key].ptr) {
      CloseDir(dirptrs[key].ptr);
      dptrs_open--;
    }
    /* Lanman 2 specific code */
    if (dirptrs[key].wcard)
      free(dirptrs[key].wcard);
    dirptrs[key].valid = False;
    string_set(&dirptrs[key].path,"");
  }
}

/****************************************************************************
close all dptrs for a cnum
****************************************************************************/
void dptr_closecnum(connection_struct *conn)
{
  int i;
  for (i=0;i<NUMDIRPTRS;i++)
    if (dirptrs[i].valid && dirptrs[i].conn == conn)
      dptr_close(i);
}

/****************************************************************************
idle all dptrs for a cnum
****************************************************************************/
void dptr_idlecnum(connection_struct *conn)
{
  int i;
  for (i=0;i<NUMDIRPTRS;i++)
    if (dirptrs[i].valid && dirptrs[i].conn == conn && dirptrs[i].ptr)
      dptr_idle(i);
}

/****************************************************************************
close a dptr that matches a given path, only if it matches the pid also
****************************************************************************/
void dptr_closepath(char *path,int pid)
{
  int i;
  for (i=0;i<NUMDIRPTRS;i++)
    if (dirptrs[i].valid && pid == dirptrs[i].pid &&
	strequal(dirptrs[i].path,path))
      dptr_close(i);
}

/****************************************************************************
  start a directory listing
****************************************************************************/
static BOOL start_dir(connection_struct *conn,char *directory)
{
	DEBUG(5,("start_dir dir=%s\n",directory));

	if (!check_name(directory,conn))
		return(False);
  
	if (! *directory)
		directory = ".";

	conn->dirptr = OpenDir(conn, directory, True);
	if (conn->dirptr) {    
		dptrs_open++;
		string_set(&conn->dirpath,directory);
		return(True);
	}
  
	return(False);
}


/****************************************************************************
create a new dir ptr
****************************************************************************/
int dptr_create(connection_struct *conn,char *path, BOOL expect_close,int pid)
{
  int i;
  uint32 old;
  int oldi;

  if (!start_dir(conn,path))
    return(-2); /* Code to say use a unix error return code. */

  if (dptrs_open >= MAX_OPEN_DIRECTORIES)
    dptr_idleoldest();

  for (i=0;i<NUMDIRPTRS;i++)
    if (!dirptrs[i].valid)
      break;
  if (i == NUMDIRPTRS) i = -1;


  /* as a 2nd option, grab the oldest not marked for expect_close */
  if (i == -1) {
    old=dircounter+1;
    oldi= -1;
    for (i=0;i<NUMDIRPTRS;i++)
      if (!dirptrs[i].expect_close && dirptrs[i].lastused < old) {
	old = dirptrs[i].lastused;
	oldi = i;
      }
    i = oldi;
  }

  /* a 3rd option - grab the oldest one */
  if (i == -1) {
    old=dircounter+1;
    oldi= -1;
    for (i=0;i<NUMDIRPTRS;i++)
      if (dirptrs[i].lastused < old) {
	old = dirptrs[i].lastused;
	oldi = i;
      }
    i = oldi;
  }

  if (i == -1) {
    DEBUG(0,("Error - all dirptrs in use??\n"));
    return(-1);
  }

  if (dirptrs[i].valid)
    dptr_close(i);

  dirptrs[i].ptr = conn->dirptr;
  string_set(&dirptrs[i].path,path);
  dirptrs[i].lastused = dircounter++;
  dirptrs[i].finished = False;
  dirptrs[i].conn = conn;
  dirptrs[i].pid = pid;
  dirptrs[i].expect_close = expect_close;
  dirptrs[i].wcard = NULL; /* Only used in lanman2 searches */
  dirptrs[i].attr = 0; /* Only used in lanman2 searches */
  dirptrs[i].valid = True;

  DEBUG(3,("creating new dirptr %d for path %s, expect_close = %d\n",
	   i,path,expect_close));  

  return(i);
}

#define DPTR_MASK ((uint32)(((uint32)1)<<31))

/****************************************************************************
fill the 5 byte server reserved dptr field
****************************************************************************/
BOOL dptr_fill(char *buf1,unsigned int key)
{
  unsigned char *buf = (unsigned char *)buf1;
  void *p = dptr_get(key,0);
  uint32 offset;
  if (!p) {
    DEBUG(1,("filling null dirptr %d\n",key));
    return(False);
  }
  offset = TellDir(p);
  DEBUG(6,("fill on key %ld dirptr 0x%lx now at %d\n",key,
	   (long)p,(int)offset));
  buf[0] = key;
  SIVAL(buf,1,offset | DPTR_MASK);
  return(True);
}


/****************************************************************************
return True is the offset is at zero
****************************************************************************/
BOOL dptr_zero(char *buf)
{
  return((IVAL(buf,1)&~DPTR_MASK) == 0);
}

/****************************************************************************
fetch the dir ptr and seek it given the 5 byte server field
****************************************************************************/
void *dptr_fetch(char *buf,int *num)
{
  unsigned int key = *(unsigned char *)buf;
  void *p = dptr_get(key,dircounter++);
  uint32 offset;
  if (!p) {
    DEBUG(3,("fetched null dirptr %d\n",key));
    return(NULL);
  }
  *num = key;
  offset = IVAL(buf,1)&~DPTR_MASK;
  SeekDir(p,offset);
  DEBUG(3,("fetching dirptr %d for path %s at offset %d\n",
	   key,dptr_path(key),offset));
  return(p);
}

/****************************************************************************
fetch the dir ptr.
****************************************************************************/
void *dptr_fetch_lanman2(int dptr_num)
{
  void *p = dptr_get(dptr_num,dircounter++);

  if (!p) {
    DEBUG(3,("fetched null dirptr %d\n",dptr_num));
    return(NULL);
  }
  DEBUG(3,("fetching dirptr %d for path %s\n",dptr_num,dptr_path(dptr_num)));
  return(p);
}

/****************************************************************************
check a filetype for being valid
****************************************************************************/
BOOL dir_check_ftype(connection_struct *conn,int mode,SMB_STRUCT_STAT *st,int dirtype)
{
  if (((mode & ~dirtype) & (aHIDDEN | aSYSTEM | aDIR)) != 0)
    return False;
  return True;
}

/****************************************************************************
  get a directory entry
****************************************************************************/
BOOL get_dir_entry(connection_struct *conn,char *mask,int dirtype,char *fname,
                   SMB_OFF_T *size,int *mode,time_t *date,BOOL check_descend)
{
  char *dname;
  BOOL found = False;
  SMB_STRUCT_STAT sbuf;
  pstring path;
  pstring pathreal;
  BOOL isrootdir;
  pstring filename;
  BOOL needslash;

  *path = *pathreal = *filename = 0;

  isrootdir = (strequal(conn->dirpath,"./") ||
	       strequal(conn->dirpath,".") ||
	       strequal(conn->dirpath,"/"));
  
  needslash = 
        ( conn->dirpath[strlen(conn->dirpath) -1] != '/');

  if (!conn->dirptr)
    return(False);
  
  while (!found)
    {
      dname = ReadDirName(conn->dirptr);

      DEBUG(6,("readdir on dirptr 0x%lx now at offset %d\n",
	       (long)conn->dirptr,TellDir(conn->dirptr)));
      
      if (dname == NULL) 
	return(False);
      
      pstrcpy(filename,dname);      

      if ((strcmp(filename,mask) == 0) ||
	  (name_map_mangle(filename,True,SNUM(conn)) &&
	   mask_match(filename,mask,False,False)))
	{
	  if (isrootdir && (strequal(filename,"..") || strequal(filename,".")))
	    continue;

	  pstrcpy(fname,filename);
	  *path = 0;
	  pstrcpy(path,conn->dirpath);
          if(needslash)
  	    pstrcat(path,"/");
	  pstrcpy(pathreal,path);
	  pstrcat(path,fname);
	  pstrcat(pathreal,dname);
	  if (dos_stat(pathreal,&sbuf) != 0) 
	    {
	      DEBUG(5,("Couldn't stat 1 [%s]\n",path));
	      continue;
	    }

	  if (check_descend &&
	      !strequal(fname,".") && !strequal(fname,".."))
	    continue;
	  
	  *mode = dos_mode(conn,pathreal,&sbuf);

	  if (!dir_check_ftype(conn,*mode,&sbuf,dirtype)) {
	    DEBUG(5,("[%s] attribs didn't match %x\n",filename,dirtype));
	    continue;
	  }

	  *size = sbuf.st_size;
	  *date = sbuf.st_mtime;

	  DEBUG(5,("get_dir_entry found %s fname=%s\n",pathreal,fname));
	  
	  found = True;
	}
    }

  return(found);
}



typedef struct
{
  int pos;
  int numentries;
  int mallocsize;
  char *data;
  char *current;
} Dir;


/*******************************************************************
open a directory
********************************************************************/
void *OpenDir(connection_struct *conn, char *name, BOOL use_veto)
{
  Dir *dirp;
  char *n;
  void *p = dos_opendir(name);
  int used=0;

  if (!p) return(NULL);
  dirp = (Dir *)malloc(sizeof(Dir));
  if (!dirp) {
    closedir(p);
    return(NULL);
  }
  dirp->pos = dirp->numentries = dirp->mallocsize = 0;
  dirp->data = dirp->current = NULL;

  while ((n = readdirname(p)))
  {
    int l = strlen(n)+1;

    /* If it's a vetoed file, pretend it doesn't even exist */
    if (use_veto && conn && IS_VETO_PATH(conn, n)) continue;

    if (used + l > dirp->mallocsize) {
      int s = MAX(used+l,used+2000);
      char *r;
      r = (char *)Realloc(dirp->data,s);
      if (!r) {
	DEBUG(0,("Out of memory in OpenDir\n"));
	break;
      }
      dirp->data = r;
      dirp->mallocsize = s;
      dirp->current = dirp->data;
    }
    pstrcpy(dirp->data+used,n);
    used += l;
    dirp->numentries++;
  }

  closedir(p);
  return((void *)dirp);
}


/*******************************************************************
close a directory
********************************************************************/
void CloseDir(void *p)
{
  Dir *dirp = (Dir *)p;
  if (!dirp) return;    
  if (dirp->data) free(dirp->data);
  free(dirp);
}

/*******************************************************************
read from a directory
********************************************************************/
char *ReadDirName(void *p)
{
  char *ret;
  Dir *dirp = (Dir *)p;

  if (!dirp || !dirp->current || dirp->pos >= dirp->numentries) return(NULL);

  ret = dirp->current;
  dirp->current = skip_string(dirp->current,1);
  dirp->pos++;

  return(ret);
}


/*******************************************************************
seek a dir
********************************************************************/
BOOL SeekDir(void *p,int pos)
{
  Dir *dirp = (Dir *)p;

  if (!dirp) return(False);

  if (pos < dirp->pos) {
    dirp->current = dirp->data;
    dirp->pos = 0;
  }

  while (dirp->pos < pos && ReadDirName(p)) ;

  return(dirp->pos == pos);
}

/*******************************************************************
tell a dir position
********************************************************************/
int TellDir(void *p)
{
  Dir *dirp = (Dir *)p;

  if (!dirp) return(-1);
  
  return(dirp->pos);
}


/* -------------------------------------------------------------------------- **
 * This section manages a global directory cache.
 * (It should probably be split into a separate module.  crh)
 * -------------------------------------------------------------------------- **
 */

typedef struct
  {
  ubi_dlNode  node;
  char       *path;
  char       *name;
  char       *dname;
  int         snum;
  } dir_cache_entry;

static ubi_dlNewList( dir_cache );

void DirCacheAdd( char *path, char *name, char *dname, int snum )
  /* ------------------------------------------------------------------------ **
   * Add an entry to the directory cache.
   *
   *  Input:  path  -
   *          name  -
   *          dname -
   *          snum  -
   *
   *  Output: None.
   *
   * ------------------------------------------------------------------------ **
   */
  {
  int               pathlen;
  int               namelen;
  dir_cache_entry  *entry;

  /* Allocate the structure & string space in one go so that it can be freed
   * in one call to free().
   */
  pathlen = strlen( path ) +1;  /* Bytes required to store path (with nul). */
  namelen = strlen( name ) +1;  /* Bytes required to store name (with nul). */
  entry = (dir_cache_entry *)malloc( sizeof( dir_cache_entry )
                                   + pathlen
                                   + namelen
                                   + strlen( dname ) +1 );
  if( NULL == entry )   /* Not adding to the cache is not fatal,  */
    return;             /* so just return as if nothing happened. */

  /* Set pointers correctly and load values. */
  entry->path  = pstrcpy( (char *)&entry[1],       path);
  entry->name  = pstrcpy( &(entry->path[pathlen]), name);
  entry->dname = pstrcpy( &(entry->name[namelen]), dname);
  entry->snum  = snum;

  /* Add the new entry to the linked list. */
  (void)ubi_dlAddHead( dir_cache, entry );
  DEBUG( 4, ("Added dir cache entry %s %s -> %s\n", path, name, dname ) );

  /* Free excess cache entries. */
  while( DIRCACHESIZE < dir_cache->count )
    free( ubi_dlRemTail( dir_cache ) );

  } /* DirCacheAdd */


char *DirCacheCheck( char *path, char *name, int snum )
  /* ------------------------------------------------------------------------ **
   * Search for an entry to the directory cache.
   *
   *  Input:  path  -
   *          name  -
   *          snum  -
   *
   *  Output: The dname string of the located entry, or NULL if the entry was
   *          not found.
   *
   *  Notes:  This uses a linear search, which is is okay because of
   *          the small size of the cache.  Use a splay tree or hash
   *          for large caches.
   *
   * ------------------------------------------------------------------------ **
   */
  {
  dir_cache_entry *entry;

  for( entry = (dir_cache_entry *)ubi_dlFirst( dir_cache );
       NULL != entry;
       entry = (dir_cache_entry *)ubi_dlNext( entry ) )
    {
    if( entry->snum == snum
        && 0 == strcmp( name, entry->name )
        && 0 == strcmp( path, entry->path ) )
      {
      DEBUG(4, ("Got dir cache hit on %s %s -> %s\n",path,name,entry->dname));
      return( entry->dname );
      }
    }

  return(NULL);
  } /* DirCacheCheck */

void DirCacheFlush(int snum)
  /* ------------------------------------------------------------------------ **
   * Remove all cache entries which have an snum that matches the input.
   *
   *  Input:  snum  -
   *
   *  Output: None.
   *
   * ------------------------------------------------------------------------ **
   */
{
	dir_cache_entry *entry;
	ubi_dlNodePtr    next;

	for(entry = (dir_cache_entry *)ubi_dlFirst( dir_cache ); 
	    NULL != entry; )  {
		next = ubi_dlNext( entry );
		if( entry->snum == snum )
			free( ubi_dlRemThis( dir_cache, entry ) );
		entry = (dir_cache_entry *)next;
	}
} /* DirCacheFlush */

/* -------------------------------------------------------------------------- **
 * End of the section that manages the global directory cache.
 * -------------------------------------------------------------------------- **
 */