source3/smbd/mangle.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    Name mangling interface
   4    Copyright (C) Andrew Tridgell 2002
   5
   6    This program is free software; you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 2 of the License, or
   9    (at your option) any later version.
  10
  11    This program is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with this program; if not, write to the Free Software
  18    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  19 */
  20
  21 #include "includes.h"
  22
  23 static struct mangle_fns *mangle_fns;
  24
  25 /* this allows us to add more mangling backends */
  26 static const struct {
  27         const char *name;
  28         struct mangle_fns *(*init_fn)(void);
  29 } mangle_backends[] = {
  30         { "hash", mangle_hash_init },
  31         { "hash2", mangle_hash2_init },
  32         /*{ "tdb", mangle_tdb_init }, */
  33         { NULL, NULL }
  34 };
  35
  36 /*
  37   initialise the mangling subsystem
  38 */
  39 static void mangle_init(void)
  40 {
  41         int i;
  42         char *method;
  43
  44         if (mangle_fns)
  45                 return;
  46
  47         method = lp_mangling_method();
  48
  49         /* find the first mangling method that manages to initialise and
  50            matches the "mangling method" parameter */
  51         for (i=0; mangle_backends[i].name && !mangle_fns; i++) {
  52                 if (!method || !*method || strcmp(method, mangle_backends[i].name) == 0) {
  53                         mangle_fns = mangle_backends[i].init_fn();
  54                 }
  55         }
  56
  57         if (!mangle_fns) {
  58                 DEBUG(0,("Failed to initialise mangling system '%s'\n", method));
  59                 exit_server("mangling init failed");
  60         }
  61 }
  62
  63
  64 /*
  65   reset the cache. This is called when smb.conf has been reloaded
  66 */
  67 void mangle_reset_cache(void)
  68 {
  69         mangle_init();
  70
  71         mangle_fns->reset();
  72 }
  73
  74 /*
  75   see if a filename has come out of our mangling code
  76 */
  77 BOOL mangle_is_mangled(const char *s)
  78 {
  79         return mangle_fns->is_mangled(s);
  80 }
  81
  82 /*
  83   see if a filename matches the rules of a 8.3 filename
  84 */
  85 BOOL mangle_is_8_3(const char *fname, BOOL check_case)
  86 {
  87         return mangle_fns->is_8_3(fname, check_case, False);
  88 }
  89
  90 BOOL mangle_is_8_3_wildcards(const char *fname, BOOL check_case)
  91 {
  92         return mangle_fns->is_8_3(fname, check_case, True);
  93 }
  94
  95 /*
  96   try to reverse map a 8.3 name to the original filename. This doesn't have to
  97   always succeed, as the directory handling code in smbd will scan the directory
  98   looking for a matching name if it doesn't. It should succeed most of the time
  99   or there will be a huge performance penalty
 100 */
 101 BOOL mangle_check_cache(char *s)
 102 {
 103         return mangle_fns->check_cache(s);
 104 }
 105
 106 /*
 107    map a long filename to a 8.3 name.
 108  */
 109
 110 void mangle_map(pstring OutName, BOOL need83, BOOL cache83, int snum)
 111 {
 112         /* name mangling can be disabled for speed, in which case
 113            we just truncate the string */
 114         if (!lp_manglednames(snum)) {
 115                 if (need83) {
 116                         string_truncate(OutName, 12);
 117                 }
 118                 return;
 119         }
 120
 121         /* invoke the inane "mangled map" code */
 122         mangle_map_filename(OutName, snum);
 123         mangle_fns->name_map(OutName, need83, cache83);
 124 }