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	{ "posix", posix_mangle_init },
33	/*{ "tdb", mangle_tdb_init }, */
34	{ NULL, NULL }
35};
36
37/*
38  initialise the mangling subsystem
39*/
40static void mangle_init(void)
41{
42	int i;
43	const char *method;
44
45	if (mangle_fns)
46		return;
47
48	method = lp_mangling_method();
49
50	/* find the first mangling method that manages to initialise and
51	   matches the "mangling method" parameter */
52	for (i=0; mangle_backends[i].name && !mangle_fns; i++) {
53		if (!method || !*method || strcmp(method, mangle_backends[i].name) == 0) {
54			mangle_fns = mangle_backends[i].init_fn();
55		}
56	}
57
58	if (!mangle_fns) {
59		DEBUG(0,("Failed to initialise mangling system '%s'\n", method));
60		exit_server("mangling init failed");
61	}
62}
63
64
65/*
66  reset the cache. This is called when smb.conf has been reloaded
67*/
68void mangle_reset_cache(void)
69{
70	mangle_init();
71	mangle_fns->reset();
72}
73
74void mangle_change_to_posix(void)
75{
76	mangle_fns = NULL;
77	lp_set_mangling_method("posix");
78	mangle_reset_cache();
79}
80
81/*
82  see if a filename has come out of our mangling code
83*/
84BOOL mangle_is_mangled(const char *s, const struct share_params *p)
85{
86	return mangle_fns->is_mangled(s, p);
87}
88
89/*
90  see if a filename matches the rules of a 8.3 filename
91*/
92BOOL mangle_is_8_3(const char *fname, BOOL check_case,
93		   const struct share_params *p)
94{
95	return mangle_fns->is_8_3(fname, check_case, False, p);
96}
97
98BOOL mangle_is_8_3_wildcards(const char *fname, BOOL check_case,
99			     const struct share_params *p)
100{
101	return mangle_fns->is_8_3(fname, check_case, True, p);
102}
103
104/*
105  try to reverse map a 8.3 name to the original filename. This doesn't have to
106  always succeed, as the directory handling code in smbd will scan the directory
107  looking for a matching name if it doesn't. It should succeed most of the time
108  or there will be a huge performance penalty
109*/
110BOOL mangle_check_cache(char *s, size_t maxlen,
111			const struct share_params *p)
112{
113	return mangle_fns->check_cache(s, maxlen, p);
114}
115
116/*
117   map a long filename to a 8.3 name.
118 */
119
120void mangle_map(pstring OutName, BOOL need83, BOOL cache83,
121		const struct share_params *p)
122{
123	/* name mangling can be disabled for speed, in which case
124	   we just truncate the string */
125	if (!lp_manglednames(p)) {
126		if (need83) {
127			string_truncate(OutName, 12);
128		}
129		return;
130	}
131
132	/* invoke the inane "mangled map" code */
133	mangle_map_filename(OutName, p);
134	mangle_fns->name_map(OutName, need83, cache83, lp_defaultcase(p->service), p);
135}
136