| 1 | /*
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| 2 | Unix SMB/CIFS implementation.
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| 3 | Name mangling interface
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| 4 | Copyright (C) Andrew Tridgell 2002
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| 5 |
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| 6 | This program is free software; you can redistribute it and/or modify
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| 7 | it under the terms of the GNU General Public License as published by
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| 8 | the Free Software Foundation; either version 3 of the License, or
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| 9 | (at your option) any later version.
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| 10 |
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| 11 | This program is distributed in the hope that it will be useful,
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| 12 | but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 14 | GNU General Public License for more details.
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| 15 |
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| 16 | You should have received a copy of the GNU General Public License
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| 17 | along with this program. If not, see <http://www.gnu.org/licenses/>.
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| 18 | */
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| 19 |
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| 20 | #include "includes.h"
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| 21 | #include "smbd/globals.h"
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| 22 |
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| 23 | /* this allows us to add more mangling backends */
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| 24 | static const struct {
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| 25 | const char *name;
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| 26 | const struct mangle_fns *(*init_fn)(void);
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| 27 | } mangle_backends[] = {
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| 28 | { "hash", mangle_hash_init },
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| 29 | { "hash2", mangle_hash2_init },
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| 30 | { "posix", posix_mangle_init },
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| 31 | /*{ "tdb", mangle_tdb_init }, */
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| 32 | { NULL, NULL }
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| 33 | };
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| 34 |
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| 35 | /*
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| 36 | initialise the mangling subsystem
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| 37 | */
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| 38 | static void mangle_init(void)
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| 39 | {
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| 40 | int i;
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| 41 | const char *method;
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| 42 |
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| 43 | if (mangle_fns)
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| 44 | return;
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| 45 |
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| 46 | method = lp_mangling_method();
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| 47 |
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| 48 | /* find the first mangling method that manages to initialise and
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| 49 | matches the "mangling method" parameter */
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| 50 | for (i=0; mangle_backends[i].name && !mangle_fns; i++) {
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| 51 | if (!method || !*method || strcmp(method, mangle_backends[i].name) == 0) {
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| 52 | mangle_fns = mangle_backends[i].init_fn();
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| 53 | }
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| 54 | }
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| 55 |
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| 56 | if (!mangle_fns) {
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| 57 | DEBUG(0,("Failed to initialise mangling system '%s'\n", method));
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| 58 | exit_server("mangling init failed");
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| 59 | }
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| 60 | }
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| 61 |
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| 62 |
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| 63 | /*
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| 64 | reset the cache. This is called when smb.conf has been reloaded
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| 65 | */
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| 66 | void mangle_reset_cache(void)
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| 67 | {
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| 68 | mangle_init();
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| 69 | mangle_fns->reset();
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| 70 | }
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| 71 |
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| 72 | void mangle_change_to_posix(void)
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| 73 | {
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| 74 | mangle_fns = NULL;
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| 75 | lp_set_mangling_method("posix");
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| 76 | mangle_reset_cache();
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| 77 | }
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| 78 |
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| 79 | /*
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| 80 | see if a filename has come out of our mangling code
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| 81 | */
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| 82 | bool mangle_is_mangled(const char *s, const struct share_params *p)
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| 83 | {
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| 84 | return mangle_fns->is_mangled(s, p);
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| 85 | }
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| 86 |
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| 87 | /*
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| 88 | see if a filename matches the rules of a 8.3 filename
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| 89 | */
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| 90 | bool mangle_is_8_3(const char *fname, bool check_case,
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| 91 | const struct share_params *p)
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| 92 | {
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| 93 | return mangle_fns->is_8_3(fname, check_case, False, p);
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| 94 | }
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| 95 |
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| 96 | bool mangle_is_8_3_wildcards(const char *fname, bool check_case,
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| 97 | const struct share_params *p)
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| 98 | {
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| 99 | return mangle_fns->is_8_3(fname, check_case, True, p);
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| 100 | }
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| 101 |
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| 102 | bool mangle_must_mangle(const char *fname,
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| 103 | const struct share_params *p)
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| 104 | {
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| 105 | if (!lp_manglednames(p)) {
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| 106 | return False;
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| 107 | }
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| 108 | return mangle_fns->must_mangle(fname, p);
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| 109 | }
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| 110 |
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| 111 | /*
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| 112 | try to reverse map a 8.3 name to the original filename. This doesn't have to
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| 113 | always succeed, as the directory handling code in smbd will scan the directory
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| 114 | looking for a matching name if it doesn't. It should succeed most of the time
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| 115 | or there will be a huge performance penalty
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| 116 | */
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| 117 | bool mangle_lookup_name_from_8_3(TALLOC_CTX *ctx,
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| 118 | const char *in,
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| 119 | char **out, /* talloced on the given context. */
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| 120 | const struct share_params *p)
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| 121 | {
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| 122 | return mangle_fns->lookup_name_from_8_3(ctx, in, out, p);
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| 123 | }
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| 124 |
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| 125 | /*
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| 126 | mangle a long filename to a 8.3 name.
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| 127 | Return True if we did mangle the name (ie. out is filled in).
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| 128 | False on error.
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| 129 | JRA.
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| 130 | */
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| 131 |
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| 132 | bool name_to_8_3(const char *in,
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| 133 | char out[13],
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| 134 | bool cache83,
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| 135 | const struct share_params *p)
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| 136 | {
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| 137 | memset(out,'\0',13);
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| 138 |
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| 139 | /* name mangling can be disabled for speed, in which case
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| 140 | we just truncate the string */
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| 141 | if (!lp_manglednames(p)) {
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| 142 | strlcpy(out, in, 13);
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| 143 | return True;
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| 144 | }
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| 145 |
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| 146 | return mangle_fns->name_to_8_3(in,
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| 147 | out,
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| 148 | cache83,
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| 149 | lp_defaultcase(p->service),
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| 150 | p);
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| 151 | }
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