2 Unix SMB/CIFS implementation.
4 Copyright (C) Andrew Tridgell 1992-2002
5 Copyright (C) Simo Sorce 2001
6 Copyright (C) Andrew Bartlett 2002
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 2 of the License, or
11 (at your option) any later version.
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with this program; if not, write to the Free Software
20 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
24 /* -------------------------------------------------------------------------- **
27 * March/April 1998 CRH
28 * - Many of the functions in this module overwrite string buffers passed to
29 * them. This causes a variety of problems and is, generally speaking,
30 * dangerous and scarry. See the kludge notes in name_map()
32 * - It seems that something is calling name_map() twice. The
33 * first call is probably some sort of test. Names which contain
34 * illegal characters are being doubly mangled. I'm not sure, but
35 * I'm guessing the problem is in server.c.
37 * -------------------------------------------------------------------------- **
40 /* -------------------------------------------------------------------------- **
43 * March/April 1998 CRH
44 * Updated a bit. Rewrote is_mangled() to be a bit more selective.
45 * Rewrote the mangled name cache. Added comments here and there.
47 * -------------------------------------------------------------------------- **
53 /* -------------------------------------------------------------------------- **
54 * External Variables...
57 extern int case_default; /* Are conforming 8.3 names all upper or lower? */
58 extern BOOL case_mangle; /* If true, all chars in 8.3 should be same case. */
60 /* -------------------------------------------------------------------------- **
63 * magic_char - This is the magic char used for mangling. It's
64 * global. There is a call to lp_magicchar() in server.c
65 * that is used to override the initial value.
67 * MANGLE_BASE - This is the number of characters we use for name mangling.
69 * basechars - The set characters used for name mangling. This
70 * is static (scope is this file only).
72 * mangle() - Macro used to select a character from basechars (i.e.,
73 * mangle(n) will return the nth digit, modulo MANGLE_BASE).
75 * chartest - array 0..255. The index range is the set of all possible
76 * values of a byte. For each byte value, the content is a
77 * two nibble pair. See BASECHAR_MASK and ILLEGAL_MASK,
80 * ct_initialized - False until the chartest array has been initialized via
81 * a call to init_chartest().
83 * BASECHAR_MASK - Masks the upper nibble of a one-byte value.
85 * ILLEGAL_MASK - Masks the lower nibble of a one-byte value.
87 * isbasecahr() - Given a character, check the chartest array to see
88 * if that character is in the basechars set. This is
89 * faster than using strchr_m().
91 * isillegal() - Given a character, check the chartest array to see
92 * if that character is in the illegal characters set.
93 * This is faster than using strchr_m().
95 * mangled_cache - Cache header used for storing mangled -> original
98 * mc_initialized - False until the mangled_cache structure has been
99 * initialized via a call to reset_mangled_cache().
101 * MANGLED_CACHE_MAX_ENTRIES - Default maximum number of entries for the
102 * cache. A value of 0 indicates "infinite".
104 * MANGLED_CACHE_MAX_MEMORY - Default maximum amount of memory for the
105 * cache. When the cache was kept as an array of 256
106 * byte strings, the default cache size was 50 entries.
107 * This required a fixed 12.5Kbytes of memory. The
108 * mangled stack parameter is no longer used (though
109 * this might change). We're now using a fixed 16Kbyte
110 * maximum cache size. This will probably be much more
114 char magic_char = '~';
116 static char basechars[] = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ_-!@#$%";
117 #define MANGLE_BASE (sizeof(basechars)/sizeof(char)-1)
119 static unsigned char chartest[256] = { 0 };
120 static BOOL ct_initialized = False;
122 #define mangle(V) ((char)(basechars[(V) % MANGLE_BASE]))
123 #define BASECHAR_MASK 0xf0
124 #define ILLEGAL_MASK 0x0f
125 #define isbasechar(C) ( (chartest[ ((C) & 0xff) ]) & BASECHAR_MASK )
126 #define isillegal(C) ( (chartest[ ((C) & 0xff) ]) & ILLEGAL_MASK )
128 static ubi_cacheRoot mangled_cache[1] = { { { 0, 0, 0, 0 }, 0, 0, 0, 0, 0, 0 } };
129 static BOOL mc_initialized = False;
130 #define MANGLED_CACHE_MAX_ENTRIES 0
131 #define MANGLED_CACHE_MAX_MEMORY 16384
134 /* -------------------------------------------------------------------------- **
135 * External Variables...
138 extern int case_default; /* Are conforming 8.3 names all upper or lower? */
139 extern BOOL case_mangle; /* If true, all chars in 8.3 should be same case. */
141 /* -------------------------------------------------------------------- */
143 static NTSTATUS has_valid_chars(const smb_ucs2_t *s)
145 if (!s || !*s) return NT_STATUS_INVALID_PARAMETER;
147 /* CHECK: this should not be necessary if the ms wild chars
148 are not valid in valid.dat --- simo */
149 if (ms_has_wild_w(s)) return NT_STATUS_UNSUCCESSFUL;
152 if(!isvalid83_w(*s)) return NT_STATUS_UNSUCCESSFUL;
159 /* return False if something fail and
160 * return 2 alloced unicode strings that contain prefix and extension
162 static NTSTATUS mangle_get_prefix(const smb_ucs2_t *ucs2_string, smb_ucs2_t **prefix, smb_ucs2_t **extension)
168 *prefix = strdup_w(ucs2_string);
170 return NT_STATUS_NO_MEMORY;
172 if ((p = strrchr_w(*prefix, UCS2_CHAR('.'))))
174 ext_len = strlen_w(p+1);
175 if ((ext_len > 0) && (ext_len < 4) && (p != *prefix) &&
176 (NT_STATUS_IS_OK(has_valid_chars(p+1)))) /* check extension */
179 *extension = strdup_w(p+1);
182 return NT_STATUS_NO_MEMORY;
189 /* ************************************************************************** **
190 * Return NT_STATUS_UNSUCCESSFUL if a name is a special msdos reserved name.
192 * Input: fname - String containing the name to be tested.
194 * Output: NT_STATUS_UNSUCCESSFUL, if the name matches one of the list of reserved names.
196 * Notes: This is a static function called by is_8_3(), below.
198 * ************************************************************************** **
200 static NTSTATUS is_valid_name(const smb_ucs2_t *fname)
203 NTSTATUS ret = NT_STATUS_OK;
205 if (!fname || !*fname) return NT_STATUS_INVALID_PARAMETER;
207 if (*fname == UCS2_CHAR('.')) return NT_STATUS_UNSUCCESSFUL;
209 ret = has_valid_chars(fname);
210 if (NT_STATUS_IS_ERR(ret)) return ret;
212 str = strdup_w(fname);
213 p = strchr_w(str, UCS2_CHAR('.'));
221 if(strcmp_wa(p, "UX") == 0)
222 ret = NT_STATUS_UNSUCCESSFUL;
225 if((strcmp_wa(p, "LOCK$") == 0)
226 || (strcmp_wa(p, "ON") == 0)
227 || (strcmp_wa(p, "OM1") == 0)
228 || (strcmp_wa(p, "OM2") == 0)
229 || (strcmp_wa(p, "OM3") == 0)
230 || (strcmp_wa(p, "OM4") == 0)
232 ret = NT_STATUS_UNSUCCESSFUL;
235 if((strcmp_wa(p, "PT1") == 0)
236 || (strcmp_wa(p, "PT2") == 0)
237 || (strcmp_wa(p, "PT3") == 0)
239 ret = NT_STATUS_UNSUCCESSFUL;
242 if(strcmp_wa(p, "UL") == 0)
243 ret = NT_STATUS_UNSUCCESSFUL;
246 if(strcmp_wa(p, "RN") == 0)
247 ret = NT_STATUS_UNSUCCESSFUL;
257 static NTSTATUS is_8_3_w(const smb_ucs2_t *fname)
259 smb_ucs2_t *pref = 0, *ext = 0;
261 NTSTATUS ret = NT_STATUS_UNSUCCESSFUL;
263 if (!fname || !*fname) return NT_STATUS_INVALID_PARAMETER;
265 if (strlen_w(fname) > 12) return NT_STATUS_UNSUCCESSFUL;
267 if (strcmp_wa(fname, ".") == 0 || strcmp_wa(fname, "..") == 0)
270 if (NT_STATUS_IS_ERR(is_valid_name(fname))) goto done;
272 if (NT_STATUS_IS_ERR(mangle_get_prefix(fname, &pref, &ext))) goto done;
273 plen = strlen_w(pref);
275 if (strchr_wa(pref, '.')) goto done;
276 if (plen < 1 || plen > 8) goto done;
277 if (ext) if (strlen_w(ext) > 3) goto done;
287 static BOOL is_8_3(const char *fname, BOOL check_case)
290 smb_ucs2_t *ucs2name;
291 NTSTATUS ret = NT_STATUS_UNSUCCESSFUL;
293 if (!fname || !*fname) return False;
294 if ((f = strrchr(fname, '/')) == NULL) f = fname;
297 if (strlen(f) > 12) return False;
299 ucs2name = acnv_uxu2(f);
302 DEBUG(0,("is_8_3: internal error acnv_uxu2() failed!\n"));
306 ret = is_8_3_w(ucs2name);
311 if (!NT_STATUS_IS_OK(ret)) {
320 /* -------------------------------------------------------------------------- **
324 /* ************************************************************************** **
325 * Initialize the static character test array.
331 * Notes: This function changes (loads) the contents of the <chartest>
332 * array. The scope of <chartest> is this file.
334 * ************************************************************************** **
336 static void init_chartest( void )
338 char *illegalchars = "*\\/?<>|\":";
341 memset( (char *)chartest, '\0', 256 );
343 for( s = (unsigned char *)illegalchars; *s; s++ )
344 chartest[*s] = ILLEGAL_MASK;
346 for( s = (unsigned char *)basechars; *s; s++ )
347 chartest[*s] |= BASECHAR_MASK;
349 ct_initialized = True;
350 } /* init_chartest */
353 /* ************************************************************************** **
354 * Return True if the name *could be* a mangled name.
356 * Input: s - A path name - in UNIX pathname format.
358 * Output: True if the name matches the pattern described below in the
361 * Notes: The input name is *not* tested for 8.3 compliance. This must be
362 * done separately. This function returns true if the name contains
363 * a magic character followed by excactly two characters from the
364 * basechars list (above), which in turn are followed either by the
365 * nul (end of string) byte or a dot (extension) or by a '/' (end of
368 * ************************************************************************** **
370 static BOOL is_mangled(const char *s)
374 if( !ct_initialized )
377 magic = strchr_m( s, magic_char );
378 while( magic && magic[1] && magic[2] ) /* 3 chars, 1st is magic. */
380 if( ('.' == magic[3] || '/' == magic[3] || !(magic[3])) /* Ends with '.' or nul or '/' ? */
381 && isbasechar( toupper(magic[1]) ) /* is 2nd char basechar? */
382 && isbasechar( toupper(magic[2]) ) ) /* is 3rd char basechar? */
383 return( True ); /* If all above, then true, */
384 magic = strchr_m( magic+1, magic_char ); /* else seek next magic. */
390 /* ************************************************************************** **
391 * Compare two cache keys and return a value indicating their ordinal
394 * Input: ItemPtr - Pointer to a comparison key. In this case, this will
395 * be a mangled name string.
396 * NodePtr - Pointer to a node in the cache. The node structure
397 * will be followed in memory by a mangled name string.
399 * Output: A signed integer, as follows:
400 * (x < 0) <==> Key1 less than Key2
401 * (x == 0) <==> Key1 equals Key2
402 * (x > 0) <==> Key1 greater than Key2
404 * Notes: This is a ubiqx-style comparison routine. See ubi_BinTree for
407 * ************************************************************************** **
409 static signed int cache_compare( ubi_btItemPtr ItemPtr, ubi_btNodePtr NodePtr )
411 char *Key1 = (char *)ItemPtr;
412 char *Key2 = (char *)(((ubi_cacheEntryPtr)NodePtr) + 1);
414 return( StrCaseCmp( Key1, Key2 ) );
415 } /* cache_compare */
417 /* ************************************************************************** **
418 * Free a cache entry.
420 * Input: WarrenZevon - Pointer to the entry that is to be returned to
424 * Notes: This function gets around the possibility that the standard
425 * free() function may be implemented as a macro, or other evil
426 * subversions (oh, so much fun).
428 * ************************************************************************** **
430 static void cache_free_entry( ubi_trNodePtr WarrenZevon )
432 ZERO_STRUCTP(WarrenZevon);
433 SAFE_FREE( WarrenZevon );
434 } /* cache_free_entry */
436 /* ************************************************************************** **
437 * Initializes or clears the mangled cache.
442 * Notes: There is a section below that is commented out. It shows how
443 * one might use lp_ calls to set the maximum memory and entry size
444 * of the cache. You might also want to remove the constants used
445 * in ubi_cacheInit() and replace them with lp_ calls. If so, then
446 * the calls to ubi_cacheSetMax*() would be moved into the else
447 * clause. Another option would be to pass in the max_entries and
448 * max_memory values as parameters. crh 09-Apr-1998.
450 * ************************************************************************** **
452 static void mangle_reset( void )
454 if( !mc_initialized )
456 (void)ubi_cacheInit( mangled_cache,
459 MANGLED_CACHE_MAX_ENTRIES,
460 MANGLED_CACHE_MAX_MEMORY );
461 mc_initialized = True;
465 (void)ubi_cacheClear( mangled_cache );
469 (void)ubi_cacheSetMaxEntries( mangled_cache, lp_mangled_cache_entries() );
470 (void)ubi_cacheSetMaxMemory( mangled_cache, lp_mangled_cache_memory() );
472 } /* reset_mangled_cache */
475 /* ************************************************************************** **
476 * Add a mangled name into the cache.
478 * Notes: If the mangled cache has not been initialized, then the
479 * function will simply fail. It could initialize the cache,
480 * but that's not the way it was done before I changed the
481 * cache mechanism, so I'm sticking with the old method.
483 * If the extension of the raw name maps directly to the
484 * extension of the mangled name, then we'll store both names
485 * *without* extensions. That way, we can provide consistent
486 * reverse mangling for all names that match. The test here is
487 * a bit more careful than the one done in earlier versions of
490 * - the extension must exist on the raw name,
491 * - it must be all lower case
492 * - it must match the mangled extension (to prove that no
493 * mangling occurred).
497 * ************************************************************************** **
499 static void cache_mangled_name( char *mangled_name, char *raw_name )
501 ubi_cacheEntryPtr new_entry;
508 /* If the cache isn't initialized, give up. */
509 if( !mc_initialized )
512 /* Init the string lengths. */
513 mangled_len = strlen( mangled_name );
514 raw_len = strlen( raw_name );
516 /* See if the extensions are unmangled. If so, store the entry
517 * without the extension, thus creating a "group" reverse map.
519 s1 = strrchr( mangled_name, '.' );
520 if( s1 && (s2 = strrchr( raw_name, '.' )) )
523 while( s1[i] && (tolower( s1[i] ) == s2[i]) )
525 if( !s1[i] && !s2[i] )
532 /* Allocate a new cache entry. If the allocation fails, just return. */
533 i = sizeof( ubi_cacheEntry ) + mangled_len + raw_len + 2;
534 new_entry = malloc( i );
538 /* Fill the new cache entry, and add it to the cache. */
539 s1 = (char *)(new_entry + 1);
540 s2 = (char *)&(s1[mangled_len + 1]);
541 (void)StrnCpy( s1, mangled_name, mangled_len );
542 (void)StrnCpy( s2, raw_name, raw_len );
543 ubi_cachePut( mangled_cache, i, new_entry, s1 );
544 } /* cache_mangled_name */
546 /* ************************************************************************** **
547 * Check for a name on the mangled name stack
549 * Input: s - Input *and* output string buffer.
551 * Output: True if the name was found in the cache, else False.
553 * Notes: If a reverse map is found, the function will overwrite the string
554 * space indicated by the input pointer <s>. This is frightening.
555 * It should be rewritten to return NULL if the long name was not
556 * found, and a pointer to the long name if it was found.
558 * ************************************************************************** **
561 static BOOL check_cache( char *s )
563 ubi_cacheEntryPtr FoundPtr;
564 char *ext_start = NULL;
566 char *saved_ext = NULL;
568 /* If the cache isn't initialized, give up. */
569 if( !mc_initialized )
572 FoundPtr = ubi_cacheGet( mangled_cache, (ubi_trItemPtr)s );
574 /* If we didn't find the name *with* the extension, try without. */
577 ext_start = strrchr( s, '.' );
580 if((saved_ext = strdup(ext_start)) == NULL)
584 FoundPtr = ubi_cacheGet( mangled_cache, (ubi_trItemPtr)s );
586 * At this point s is the name without the
587 * extension. We re-add the extension if saved_ext
588 * is not null, before freeing saved_ext.
593 /* Okay, if we haven't found it we're done. */
598 /* Replace the saved_ext as it was truncated. */
599 (void)pstrcat( s, saved_ext );
600 SAFE_FREE(saved_ext);
605 /* If we *did* find it, we need to copy it into the string buffer. */
606 found_name = (char *)(FoundPtr + 1);
607 found_name += (strlen( found_name ) + 1);
609 (void)pstrcpy( s, found_name );
612 /* Replace the saved_ext as it was truncated. */
613 (void)pstrcat( s, saved_ext );
614 SAFE_FREE(saved_ext);
618 } /* check_mangled_cache */
621 /*****************************************************************************
622 * do the actual mangling to 8.3 format
623 * the buffer must be able to hold 13 characters (including the null)
624 *****************************************************************************
626 static void to_8_3(char *s)
639 if( p && (strlen(p+1) < (size_t)4) )
641 BOOL all_normal = ( strisnormal(p+1) ); /* XXXXXXXXX */
643 if( all_normal && p[1] != 0 )
646 csum = str_checksum( s );
650 csum = str_checksum(s);
653 csum = str_checksum(s);
660 safe_strcpy( extension, "___", 3 );
664 while( *p && extlen < 3 )
667 extension[extlen++] = p[0];
671 extension[extlen] = 0;
677 while( *p && baselen < 5 )
680 base[baselen++] = p[0];
686 csum = csum % (MANGLE_BASE*MANGLE_BASE);
688 (void)slprintf(s, 12, "%s%c%c%c",
689 base, magic_char, mangle( csum/MANGLE_BASE ), mangle( csum ) );
693 (void)pstrcat( s, "." );
694 (void)pstrcat( s, extension );
697 } /* mangle_name_83 */
699 /*****************************************************************************
700 * Convert a filename to DOS format. Return True if successful.
702 * Input: OutName - Source *and* destination buffer.
704 * NOTE that OutName must point to a memory space that
705 * is at least 13 bytes in size!
707 * need83 - If False, name mangling will be skipped unless the
708 * name contains illegal characters. Mapping will still
709 * be done, if appropriate. This is probably used to
710 * signal that a client does not require name mangling,
711 * thus skipping the name mangling even on shares which
712 * have name-mangling turned on.
713 * cache83 - If False, the mangled name cache will not be updated.
714 * This is usually used to prevent that we overwrite
715 * a conflicting cache entry prematurely, i.e. before
716 * we know whether the client is really interested in the
717 * current name. (See PR#13758). UKD.
719 * Output: Returns False only if the name wanted mangling but the share does
720 * not have name mangling turned on.
722 * ****************************************************************************
724 static BOOL name_map(char *OutName, BOOL need83, BOOL cache83)
726 smb_ucs2_t *OutName_ucs2;
727 DEBUG(5,("name_map( %s, need83 = %s, cache83 = %s)\n", OutName,
728 need83 ? "True" : "False", cache83 ? "True" : "False"));
730 if (push_ucs2_allocate((void **)&OutName_ucs2, OutName) < 0) {
731 DEBUG(0, ("push_ucs2_allocate failed!\n"));
735 /* check if it's already in 8.3 format */
736 if (need83 && !NT_STATUS_IS_OK(is_8_3_w(OutName_ucs2))) {
739 /* mangle it into 8.3 */
741 tmp = strdup(OutName);
746 cache_mangled_name(OutName, tmp);
751 DEBUG(5,("name_map() ==> [%s]\n", OutName));
752 SAFE_FREE(OutName_ucs2);
758 the following provides the abstraction layer to make it easier
759 to drop in an alternative mangling implementation
761 static struct mangle_fns mangle_fns = {
769 /* return the methods for this mangling implementation */
770 struct mangle_fns *mangle_hash_init(void)