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
23static struct mangle_fns *mangle_fns;
24
25/* this allows us to add more mangling backends */
26static 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*/
39static 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*/
67void 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*/
77BOOL 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*/
85BOOL mangle_is_8_3(const char *fname, BOOL check_case)
86{
87	return mangle_fns->is_8_3(fname, check_case, False);
88}
89
90BOOL 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*/
101BOOL mangle_check_cache(char *s, size_t maxlen)
102{
103	return mangle_fns->check_cache(s, maxlen);
104}
105
106/*
107   map a long filename to a 8.3 name.
108 */
109
110void 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, lp_defaultcase(snum));
124}
125