summaryrefslogtreecommitdiff
path: root/source3/smbd/mangle.c
blob: 16286a8bb1e1fb60dcf6c71a5d6b84796d38faa8 (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
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
/* 
   Unix SMB/Netbios implementation.
   Version 1.9.
   Name mangling
   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.
*/

/* -------------------------------------------------------------------------- **
 * Notable problems...
 *
 *  March/April 1998  CRH
 *  - Many of the functions in this module overwrite string buffers passed to
 *    them.  This causes a variety of problems and is, generally speaking,
 *    dangerous and scarry.  See the kludge notes in name_map_mangle()
 *    below.
 *  - It seems that something is calling name_map_mangle() twice.  The
 *    first call is probably some sort of test.  Names which contain
 *    illegal characters are being doubly mangled.  I'm not sure, but
 *    I'm guessing the problem is in server.c.
 *
 * -------------------------------------------------------------------------- **
 */

/* -------------------------------------------------------------------------- **
 * History...
 *
 *  March/April 1998  CRH
 *  Updated a bit.  Rewrote is_mangled() to be a bit more selective.
 *  Rewrote the mangled name cache.  Added comments here and there.
 *  &c.
 * -------------------------------------------------------------------------- **
 */

#include "includes.h"


/* -------------------------------------------------------------------------- **
 * External Variables...
 */

extern int DEBUGLEVEL;      /* Global debug level.                            */
extern int case_default;    /* Are conforming 8.3 names all upper or lower?   */
extern BOOL case_mangle;    /* If true, all chars in 8.3 should be same case. */

/* -------------------------------------------------------------------------- **
 * Other stuff...
 *
 * magic_char     - This is the magic char used for mangling.  It's
 *                  global.  There is a call to lp_magicchar() in server.c
 *                  that is used to override the initial value.
 *
 * MANGLE_BASE    - This is the number of characters we use for name mangling.
 *
 * basechars      - The set characters used for name mangling.  This
 *                  is static (scope is this file only).
 *
 * mangle()       - Macro used to select a character from basechars (i.e.,
 *                  mangle(n) will return the nth digit, modulo MANGLE_BASE).
 *
 * chartest       - array 0..255.  The index range is the set of all possible
 *                  values of a byte.  For each byte value, the content is a
 *                  two nibble pair.  See BASECHAR_MASK and ILLEGAL_MASK,
 *                  below.
 *
 * ct_initialized - False until the chartest array has been initialized via
 *                  a call to init_chartest().
 *
 * BASECHAR_MASK  - Masks the upper nibble of a one-byte value.
 *
 * ILLEGAL_MASK   - Masks the lower nibble of a one-byte value.
 *
 * isbasecahr()   - Given a character, check the chartest array to see
 *                  if that character is in the basechars set.  This is
 *                  faster than using strchr_m().
 *
 * isillegal()    - Given a character, check the chartest array to see
 *                  if that character is in the illegal characters set.
 *                  This is faster than using strchr_m().
 *
 * mangled_cache  - Cache header used for storing mangled -> original
 *                  reverse maps.
 *
 * mc_initialized - False until the mangled_cache structure has been
 *                  initialized via a call to reset_mangled_cache().
 *
 * MANGLED_CACHE_MAX_ENTRIES - Default maximum number of entries for the
 *                  cache.  A value of 0 indicates "infinite".
 *
 * MANGLED_CACHE_MAX_MEMORY  - Default maximum amount of memory for the
 *                  cache.  When the cache was kept as an array of 256
 *                  byte strings, the default cache size was 50 entries.
 *                  This required a fixed 12.5Kbytes of memory.  The
 *                  mangled stack parameter is no longer used (though
 *                  this might change).  We're now using a fixed 16Kbyte
 *                  maximum cache size.  This will probably be much more
 *                  than 50 entries.
 */

char magic_char = '~';

static char basechars[] = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ_-!@#$%";
#define MANGLE_BASE       ( (sizeof(basechars)/sizeof(char)) - 1 )

static unsigned char chartest[256]  = { 0 };
static BOOL          ct_initialized = False;

#define mangle(V) ((char)(basechars[(V) % MANGLE_BASE]))
#define BASECHAR_MASK 0xf0
#define ILLEGAL_MASK  0x0f
#define isbasechar(C) ( (chartest[ ((C) & 0xff) ]) & BASECHAR_MASK )
#define isillegal(C) ( (chartest[ ((C) & 0xff) ]) & ILLEGAL_MASK )

static ubi_cacheRoot mangled_cache[1] = {{ { 0, 0, 0, 0 }, 0, 0, 0, 0, 0, 0 }};
static BOOL          mc_initialized   = False;
#define MANGLED_CACHE_MAX_ENTRIES 0
#define MANGLED_CACHE_MAX_MEMORY  16384


/* -------------------------------------------------------------------------- **
 * Functions...
 */

/* ************************************************************************** **
 * Initialize the static character test array.
 *
 *  Input:  none
 *
 *  Output: none
 *
 *  Notes:  This function changes (loads) the contents of the <chartest>
 *          array.  The scope of <chartest> is this file.
 *
 * ************************************************************************** **
 */
static void init_chartest( void )
  {
  char          *illegalchars = "*\\/?<>|\":";
  unsigned char *s;
  
  memset( (char *)chartest, '\0', 256 );

  for( s = (unsigned char *)illegalchars; *s; s++ )
    chartest[*s] = ILLEGAL_MASK;

  for( s = (unsigned char *)basechars; *s; s++ )
    chartest[*s] |= BASECHAR_MASK;

  ct_initialized = True;
  } /* init_chartest */

/* ************************************************************************** **
 * Return True if a name is a special msdos reserved name.
 *
 *  Input:  fname - String containing the name to be tested.
 *
 *  Output: True, if the name matches one of the list of reserved names.
 *
 *  Notes:  This is a static function called by is_8_3(), below.
 *
 * ************************************************************************** **
 */
static BOOL is_reserved_msdos( char *fname )
  {
  char upperFname[13];
  char *p;

  StrnCpy (upperFname, fname, 12);

  /* lpt1.txt and con.txt etc are also illegal */
  p = strchr_m(upperFname,'.');
  if( p )
    *p = '\0';

  strupper( upperFname );
  p = upperFname + 1;
  switch( upperFname[0] )
    {
    case 'A':
      if( 0 == strcmp( p, "UX" ) )
        return( True );
      break;
    case 'C':
      if( (0 == strcmp( p, "LOCK$" ))
       || (0 == strcmp( p, "ON" ))
       || (0 == strcmp( p, "OM1" ))
       || (0 == strcmp( p, "OM2" ))
       || (0 == strcmp( p, "OM3" ))
       || (0 == strcmp( p, "OM4" ))
        )
        return( True );
      break;
    case 'L':
      if( (0 == strcmp( p, "PT1" ))
       || (0 == strcmp( p, "PT2" ))
       || (0 == strcmp( p, "PT3" ))
        )
        return( True );
      break;
    case 'N':
      if( 0 == strcmp( p, "UL" ) )
        return( True );
      break;
    case 'P':
      if( 0 == strcmp( p, "RN" ) )
        return( True );
      break;
    }

  return( False );
  } /* is_reserved_msdos */

/* ************************************************************************** **
 * Determine whether or not a given name contains illegal characters, even
 * long names.
 *
 *  Input:  name  - The name to be tested.
 *
 *  Output: True if an illegal character was found in <name>, else False.
 *
 *  Notes:  This is used to test a name on the host system, long or short,
 *          for characters that would be illegal on most client systems,
 *          particularly DOS and Windows systems.  Unix and AmigaOS, for
 *          example, allow a filenames which contain such oddities as
 *          quotes (").  If a name is found which does contain an illegal
 *          character, it is mangled even if it conforms to the 8.3
 *          format.
 *
 * ************************************************************************** **
 */
static BOOL is_illegal_name( char *name )
  {
  unsigned char *s;

  if( !name )
    return( True );

  if( !ct_initialized )
    init_chartest();

  s = (unsigned char *)name;
  while( *s )
    {
      if( *s>0x7F && isillegal( *s ) )
        return( True );
      else
        s++;
    }

  return( False );
  } /* is_illegal_name */

/* ************************************************************************** **
 * Return True if the name *could be* a mangled name.
 *
 *  Input:  s - A path name - in UNIX pathname format.
 *
 *  Output: True if the name matches the pattern described below in the
 *          notes, else False.
 *
 *  Notes:  The input name is *not* tested for 8.3 compliance.  This must be
 *          done separately.  This function returns true if the name contains
 *          a magic character followed by excactly two characters from the
 *          basechars list (above), which in turn are followed either by the
 *          nul (end of string) byte or a dot (extension) or by a '/' (end of
 *          a directory name).
 *
 * ************************************************************************** **
 */
BOOL is_mangled( char *s )
  {
  char *magic;

  if( !ct_initialized )
    init_chartest();

  magic = strchr_m( s, magic_char );
  while( magic && magic[1] && magic[2] )          /* 3 chars, 1st is magic. */
    {
    if( ('.' == magic[3] || '/' == magic[3] || !(magic[3]))          /* Ends with '.' or nul or '/' ?  */
     && isbasechar( toupper(magic[1]) )           /* is 2nd char basechar?  */
     && isbasechar( toupper(magic[2]) ) )         /* is 3rd char basechar?  */
      return( True );                           /* If all above, then true, */
    magic = strchr_m( magic+1, magic_char );      /*    else seek next magic. */
    }
  return( False );
  } /* is_mangled */

/* ************************************************************************** **
 * Return True if the name is a valid DOS name in 8.3 DOS format.
 *
 *  Input:  fname       - File name to be checked.
 *          check_case  - If True, and if case_mangle is True, then the
 *                        name will be checked to see if all characters
 *                        are the correct case.  See case_mangle and
 *                        case_default above.
 *
 *  Output: True if the name is a valid DOS name, else FALSE.
 *
 * ************************************************************************** **
 */
BOOL is_8_3( char *fname, BOOL check_case )
  {
  int   len;
  int   l;
  char *p;
  char *dot_pos;
  char *slash_pos = strrchr_m( fname, '/' );

  /* If there is a directory path, skip it. */
  if( slash_pos )
    fname = slash_pos + 1;
  len = strlen( fname );

  DEBUG( 5, ( "Checking %s for 8.3\n", fname ) );

  /* Can't be 0 chars or longer than 12 chars */
  if( (len == 0) || (len > 12) )
    return( False );

  /* Mustn't be an MS-DOS Special file such as lpt1 or even lpt1.txt */
  if( is_reserved_msdos( fname ) )
    return( False );

  /* Check that all characters are the correct case, if asked to do so. */
  if( check_case && case_mangle )
    {
    switch( case_default )
      {
      case CASE_LOWER:
        if( strhasupper( fname ) )
          return(False);
        break;
      case CASE_UPPER:
        if( strhaslower( fname ) )
          return(False);
        break;
      }
    }

  /* Can't contain invalid dos chars */
  /* Windows use the ANSI charset.
     But filenames are translated in the PC charset.
     This Translation may be more or less relaxed depending
     the Windows application. */

  /* %%% A nice improvment to name mangling would be to translate
     filename to ANSI charset on the smb server host */

  p       = fname;
  dot_pos = NULL;
  while( *p )
    {
      if( *p == '.' && !dot_pos )
        dot_pos = (char *)p;
      /*else
        if( !isdoschar( *p ) )
          return( False );*/
      p++;
    }

  /* no dot and less than 9 means OK */
  if( !dot_pos )
    return( len <= 8 );
        
  l = PTR_DIFF( dot_pos, fname );

  /* base must be at least 1 char except special cases . and .. */
  if( l == 0 )
    return( 0 == strcmp( fname, "." ) || 0 == strcmp( fname, ".." ) );

  /* base can't be greater than 8 */
  if( l > 8 )
    return( False );

  /* see smb.conf(5) for a description of the 'strip dot' parameter. */
  if( lp_strip_dot()
   && len - l == 1
   && !strchr_m( dot_pos + 1, '.' ) )
    {
    *dot_pos = 0;
    return( True );
    }

  /* extension must be between 1 and 3 */
  if( (len - l < 2 ) || (len - l > 4) )
    return( False );

  /* extensions may not have a dot */
  if( strchr_m( dot_pos+1, '.' ) )
    return( False );

  /* must be in 8.3 format */
  return( True );
  } /* is_8_3 */


/* ************************************************************************** **
 * Compare two cache keys and return a value indicating their ordinal
 * relationship.
 *
 *  Input:  ItemPtr - Pointer to a comparison key.  In this case, this will
 *                    be a mangled name string.
 *          NodePtr - Pointer to a node in the cache.  The node structure
 *                    will be followed in memory by a mangled name string.
 *
 *  Output: A signed integer, as follows:
 *            (x < 0)  <==> Key1 less than Key2
 *            (x == 0) <==> Key1 equals Key2
 *            (x > 0)  <==> Key1 greater than Key2
 *
 *  Notes:  This is a ubiqx-style comparison routine.  See ubi_BinTree for
 *          more info.
 *
 * ************************************************************************** **
 */
static signed int cache_compare( ubi_btItemPtr ItemPtr, ubi_btNodePtr NodePtr )
  {
  char *Key1 = (char *)ItemPtr;
  char *Key2 = (char *)(((ubi_cacheEntryPtr)NodePtr) + 1);

  return( StrCaseCmp( Key1, Key2 ) );
  } /* cache_compare */

/* ************************************************************************** **
 * Free a cache entry.
 *
 *  Input:  WarrenZevon - Pointer to the entry that is to be returned to
 *                        Nirvana.
 *  Output: none.
 *
 *  Notes:  This function gets around the possibility that the standard
 *          free() function may be implemented as a macro, or other evil
 *          subversions (oh, so much fun).
 *
 * ************************************************************************** **
 */
static void cache_free_entry( ubi_trNodePtr WarrenZevon )
  {
	  ZERO_STRUCTP(WarrenZevon);
	  free( WarrenZevon );
  } /* cache_free_entry */

/* ************************************************************************** **
 * Initializes or clears the mangled cache.
 *
 *  Input:  none.
 *  Output: none.
 *
 *  Notes:  There is a section below that is commented out.  It shows how
 *          one might use lp_ calls to set the maximum memory and entry size
 *          of the cache.  You might also want to remove the constants used
 *          in ubi_cacheInit() and replace them with lp_ calls.  If so, then
 *          the calls to ubi_cacheSetMax*() would be moved into the else
 *          clause.  Another option would be to pass in the max_entries and
 *          max_memory values as parameters.  crh 09-Apr-1998.
 *
 * ************************************************************************** **
 */
void reset_mangled_cache( void )
  {
  if( !mc_initialized )
    {
    (void)ubi_cacheInit( mangled_cache,
                         cache_compare,
                         cache_free_entry,
                         MANGLED_CACHE_MAX_ENTRIES,
                         MANGLED_CACHE_MAX_MEMORY );
    mc_initialized = True;
    }
  else
    {
    (void)ubi_cacheClear( mangled_cache );
    }

  /*
  (void)ubi_cacheSetMaxEntries( mangled_cache, lp_mangled_cache_entries() );
  (void)ubi_cacheSetMaxMemory(  mangled_cache, lp_mangled_cache_memory() );
  */
  } /* reset_mangled_cache  */


/* ************************************************************************** **
 * Add a mangled name into the cache.
 *
 *  Notes:  If the mangled cache has not been initialized, then the
 *          function will simply fail.  It could initialize the cache,
 *          but that's not the way it was done before I changed the
 *          cache mechanism, so I'm sticking with the old method.
 *
 *          If the extension of the raw name maps directly to the
 *          extension of the mangled name, then we'll store both names
 *          *without* extensions.  That way, we can provide consistent
 *          reverse mangling for all names that match.  The test here is
 *          a bit more careful than the one done in earlier versions of
 *          mangle.c:
 *
 *            - the extension must exist on the raw name,
 *            - it must be all lower case
 *            - it must match the mangled extension (to prove that no
 *              mangling occurred).
 *
 *  crh 07-Apr-1998
 *
 * ************************************************************************** **
 */
static void cache_mangled_name( char *mangled_name, char *raw_name )
  {
  ubi_cacheEntryPtr new_entry;
  char             *s1;
  char             *s2;
  size_t               mangled_len;
  size_t               raw_len;
  size_t               i;

  /* If the cache isn't initialized, give up. */
  if( !mc_initialized )
    return;

  /* Init the string lengths. */
  mangled_len = strlen( mangled_name );
  raw_len     = strlen( raw_name );

  /* See if the extensions are unmangled.  If so, store the entry
   * without the extension, thus creating a "group" reverse map.
   */
  s1 = strrchr_m( mangled_name, '.' );
  if( s1 && (s2 = strrchr_m( raw_name, '.' )) )
    {
    i = 1;
    while( s1[i] && (tolower( s1[1] ) == s2[i]) )
      i++;
    if( !s1[i] && !s2[i] )
      {
      mangled_len -= i;
      raw_len     -= i;
      }
    }

  /* Allocate a new cache entry.  If the allocation fails, just return. */
  i = sizeof( ubi_cacheEntry ) + mangled_len + raw_len + 2;
  new_entry = malloc( i );
  if( !new_entry )
    return;

  /* Fill the new cache entry, and add it to the cache. */
  s1 = (char *)(new_entry + 1);
  s2 = (char *)&(s1[mangled_len + 1]);
  (void)StrnCpy( s1, mangled_name, mangled_len );
  (void)StrnCpy( s2, raw_name,     raw_len );
  ubi_cachePut( mangled_cache, i, new_entry, s1 );
  } /* cache_mangled_name */

/* ************************************************************************** **
 * Check for a name on the mangled name stack
 *
 *  Input:  s - Input *and* output string buffer.
 *
 *  Output: True if the name was found in the cache, else False.
 *
 *  Notes:  If a reverse map is found, the function will overwrite the string
 *          space indicated by the input pointer <s>.  This is frightening.
 *          It should be rewritten to return NULL if the long name was not
 *          found, and a pointer to the long name if it was found.
 *
 * ************************************************************************** **
 */

BOOL check_mangled_cache( char *s )
{
  ubi_cacheEntryPtr FoundPtr;
  char             *ext_start = NULL;
  char             *found_name;
  char             *saved_ext = NULL;

  /* If the cache isn't initialized, give up. */
  if( !mc_initialized )
    return( False );

  FoundPtr = ubi_cacheGet( mangled_cache, (ubi_trItemPtr)s );

  /* If we didn't find the name *with* the extension, try without. */
  if( !FoundPtr )
  {
    ext_start = strrchr_m( s, '.' );
    if( ext_start )
    {
      if((saved_ext = strdup(ext_start)) == NULL)
        return False;

      *ext_start = '\0';
      FoundPtr = ubi_cacheGet( mangled_cache, (ubi_trItemPtr)s );
      /* 
       * At this point s is the name without the
       * extension. We re-add the extension if saved_ext
       * is not null, before freeing saved_ext.
       */
    }
  }

  /* Okay, if we haven't found it we're done. */
  if( !FoundPtr )
  {
    if(saved_ext)
    {
      /* Replace the saved_ext as it was truncated. */
      (void)pstrcat( s, saved_ext );
      free(saved_ext);
    }
    return( False );
  }

  /* If we *did* find it, we need to copy it into the string buffer. */
  found_name = (char *)(FoundPtr + 1);
  found_name += (strlen( found_name ) + 1);

  DEBUG( 3, ("Found %s on mangled stack ", s) );

  (void)pstrcpy( s, found_name );
  if( saved_ext )
  {
    /* Replace the saved_ext as it was truncated. */
    (void)pstrcat( s, saved_ext );
    free(saved_ext);
  }

  DEBUG( 3, ("as %s\n", s) );

  return( True );
} /* check_mangled_cache */


/* ************************************************************************** **
 * Used only in do_fwd_mangled_map(), below.
 * ************************************************************************** **
 */
static char *map_filename( char *s,         /* This is null terminated */
                           char *pattern,   /* This isn't. */
                           int len )        /* This is the length of pattern. */
  {
  static pstring matching_bit;  /* The bit of the string which matches */
                                /* a * in pattern if indeed there is a * */
  char *sp;                     /* Pointer into s. */
  char *pp;                     /* Pointer into p. */
  char *match_start;            /* Where the matching bit starts. */
  pstring pat;

  StrnCpy( pat, pattern, len ); /* Get pattern into a proper string! */
  pstrcpy( matching_bit, "" );  /* Match but no star gets this. */
  pp = pat;                     /* Initialize the pointers. */
  sp = s;

  if( strequal(s, ".") || strequal(s, ".."))
    {
    return NULL;                /* Do not map '.' and '..' */
    }

  if( (len == 1) && (*pattern == '*') )
    {
    return NULL;                /* Impossible, too ambiguous for */
    }                           /* words! */

  while( (*sp)                  /* Not the end of the string. */
      && (*pp)                  /* Not the end of the pattern. */
      && (*sp == *pp)           /* The two match. */
      && (*pp != '*') )         /* No wildcard. */
    {
    sp++;                       /* Keep looking. */
    pp++;
    }

  if( !*sp && !*pp )            /* End of pattern. */
    return( matching_bit );     /* Simple match.  Return empty string. */

  if( *pp == '*' )
    {
    pp++;                       /* Always interrested in the chacter */
                                /* after the '*' */
    if( !*pp )                  /* It is at the end of the pattern. */
      {
      StrnCpy( matching_bit, s, sp-s );
      return( matching_bit );
      }
    else
      {
      /* The next character in pattern must match a character further */
      /* along s than sp so look for that character. */
      match_start = sp;
      while( (*sp)              /* Not the end of s. */
          && (*sp != *pp) )     /* Not the same  */
        sp++;                   /* Keep looking. */
      if( !*sp )                /* Got to the end without a match. */
        {
        return( NULL );
        }                       /* Still hope for a match. */
      else
        {
        /* Now sp should point to a matching character. */
        StrnCpy(matching_bit, match_start, sp-match_start);
        /* Back to needing a stright match again. */
        while( (*sp)            /* Not the end of the string. */
            && (*pp)            /* Not the end of the pattern. */
            && (*sp == *pp) )   /* The two match. */
          {
          sp++;                 /* Keep looking. */
          pp++;
          }
        if( !*sp && !*pp )      /* Both at end so it matched */
          return( matching_bit );
        else
          return( NULL );
        }
      }
    }
  return( NULL );               /* No match. */
  } /* map_filename */


/* ************************************************************************** **
 * MangledMap is a series of name pairs in () separated by spaces.
 * If s matches the first of the pair then the name given is the
 * second of the pair.  A * means any number of any character and if
 * present in the second of the pair as well as the first the
 * matching part of the first string takes the place of the * in the
 * second.
 *
 * I wanted this so that we could have RCS files which can be used
 * by UNIX and DOS programs.  My mapping string is (RCS rcs) which
 * converts the UNIX RCS file subdirectory to lowercase thus
 * preventing mangling.
 *
 * (I think Andrew wrote the above, but I'm not sure. -- CRH)
 *
 * See 'mangled map' in smb.conf(5).
 *
 * ************************************************************************** **
 */
static void do_fwd_mangled_map(char *s, char *MangledMap)
  {
  char *start=MangledMap;       /* Use this to search for mappings. */
  char *end;                    /* Used to find the end of strings. */
  char *match_string;
  pstring new_string;           /* Make up the result here. */
  char *np;                     /* Points into new_string. */

  DEBUG( 5, ("Mangled Mapping '%s' map '%s'\n", s, MangledMap) );
  while( *start )
    {
    while( (*start) && (*start != '(') )
      start++;
    if( !*start )
      continue;                 /* Always check for the end. */
    start++;                    /* Skip the ( */
    end = start;                /* Search for the ' ' or a ')' */
    DEBUG( 5, ("Start of first in pair '%s'\n", start) );
    while( (*end) && !((*end == ' ') || (*end == ')')) )
      end++;
    if( !*end )
      {
      start = end;
      continue;                 /* Always check for the end. */
      }
    DEBUG( 5, ("End of first in pair '%s'\n", end) );
    if( (match_string = map_filename( s, start, end-start )) )
      {
      DEBUG( 5, ("Found a match\n") );
      /* Found a match. */
      start = end + 1;          /* Point to start of what it is to become. */
      DEBUG( 5, ("Start of second in pair '%s'\n", start) );
      end = start;
      np = new_string;
      while( (*end)             /* Not the end of string. */
          && (*end != ')')      /* Not the end of the pattern. */
          && (*end != '*') )    /* Not a wildcard. */
        *np++ = *end++;
      if( !*end )
        {
        start = end;
        continue;               /* Always check for the end. */
        }
      if( *end == '*' )
        {
        pstrcpy( np, match_string );
        np += strlen( match_string );
        end++;                  /* Skip the '*' */
        while( (*end)             /* Not the end of string. */
            && (*end != ')')      /* Not the end of the pattern. */
            && (*end != '*') )    /* Not a wildcard. */
          *np++ = *end++;
        }
      if( !*end )
        {
        start = end;
        continue;               /* Always check for the end. */
        }
      *np++ = '\0';             /* NULL terminate it. */
      DEBUG(5,("End of second in pair '%s'\n", end));
      pstrcpy( s, new_string );  /* Substitute with the new name. */
      DEBUG( 5, ("s is now '%s'\n", s) );
      }
    start = end;              /* Skip a bit which cannot be wanted anymore. */
    start++;
    }
  } /* do_fwd_mangled_map */

/*****************************************************************************
 * do the actual mangling to 8.3 format
 * the buffer must be able to hold 13 characters (including the null)
 *****************************************************************************
 */
void mangle_name_83( char *s)
  {
  int csum;
  char *p;
  char extension[4];
  char base[9];
  int baselen = 0;
  int extlen = 0;

  extension[0] = 0;
  base[0] = 0;

  p = strrchr_m(s,'.');  
  if( p && (strlen(p+1) < (size_t)4) )
    {
    BOOL all_normal = ( strisnormal(p+1) ); /* XXXXXXXXX */

    if( all_normal && p[1] != 0 )
      {
      *p = 0;
      csum = str_checksum( s );
      *p = '.';
      }
    else
      csum = str_checksum(s);
    }
  else
    csum = str_checksum(s);

  strupper( s );

  DEBUG( 5, ("Mangling name %s to ",s) );

  if( p )
    {
    if( p == s )
      safe_strcpy( extension, "___", 3 );
    else
      {
      *p++ = 0;
      while( *p && extlen < 3 )
        {
            if( /*isdoschar (*p) &&*/ *p != '.' )
              extension[extlen++] = p[0];
            p++;
        }
      extension[extlen] = 0;
      }
    }

  p = s;

  while( *p && baselen < 5 )
    {
        if( /*isdoschar( *p ) &&*/ *p != '.' )
          base[baselen++] = p[0];
        p++;
    }
  base[baselen] = 0;

  csum = csum % (MANGLE_BASE*MANGLE_BASE);

  (void)slprintf(s, 12, "%s%c%c%c",
                 base, magic_char, mangle( csum/MANGLE_BASE ), mangle( csum ) );

  if( *extension )
    {
    (void)pstrcat( s, "." );
    (void)pstrcat( s, extension );
    }

  DEBUG( 5, ( "%s\n", s ) );

  } /* mangle_name_83 */

/*****************************************************************************
 * Convert a filename to DOS format.  Return True if successful.
 *
 *  Input:  OutName - Source *and* destination buffer. 
 *
 *                    NOTE that OutName must point to a memory space that
 *                    is at least 13 bytes in size!
 *
 *          need83  - If False, name mangling will be skipped unless the
 *                    name contains illegal characters.  Mapping will still
 *                    be done, if appropriate.  This is probably used to
 *                    signal that a client does not require name mangling,
 *                    thus skipping the name mangling even on shares which
 *                    have name-mangling turned on.
 *          cache83 - If False, the mangled name cache will not be updated.
 *                    This is usually used to prevent that we overwrite
 *                    a conflicting cache entry prematurely, i.e. before
 *                    we know whether the client is really interested in the
 *                    current name.  (See PR#13758).  UKD.
 *          snum    - Share number.  This identifies the share in which the
 *                    name exists.
 *
 *  Output: Returns False only if the name wanted mangling but the share does
 *          not have name mangling turned on.
 *
 * ****************************************************************************
 */
BOOL name_map_mangle(char *OutName, BOOL need83, BOOL cache83, int snum)
{
	char *map;
	DEBUG(5,("name_map_mangle( %s, need83 = %s, cache83 = %s, %d )\n", OutName,
		need83 ? "TRUE" : "FALSE", cache83 ? "TRUE" : "FALSE", snum));

#ifdef MANGLE_LONG_FILENAMES
	if( !need83 && is_illegal_name(OutName) )
		need83 = True;
#endif  

	/* apply any name mappings */
	map = lp_mangled_map(snum);

	if (map && *map) {
		do_fwd_mangled_map( OutName, map );
	}

	/* check if it's already in 8.3 format */
	if (need83 && !is_8_3(OutName, True)) {
		char *tmp = NULL; 

		if (!lp_manglednames(snum)) {
			return(False);
		}

		/* mangle it into 8.3 */
		if (cache83)
			tmp = strdup(OutName);

		mangle_name_83(OutName);

		if(tmp != NULL) {
			cache_mangled_name(OutName, tmp);
			free(tmp);
		}
	}

	DEBUG(5,("name_map_mangle() ==> [%s]\n", OutName));
	return(True);
} /* name_map_mangle */