1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
|
/*
Unix SMB/CIFS implementation.
LDB wrap functions
Copyright (C) Andrew Tridgell 2004
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
/*
the stupidity of the unix fcntl locking design forces us to never
allow a database file to be opened twice in the same process. These
wrappers provide convenient access to a tdb or ldb, taking advantage
of talloc destructors to ensure that only a single open is done
*/
#include "includes.h"
#include "lib/events/events.h"
#include "lib/ldb/include/ldb.h"
#include "lib/ldb/include/ldb_errors.h"
#include "lib/ldb-samba/ldif_handlers.h"
#include "ldb_wrap.h"
#include "dsdb/samdb/samdb.h"
#include "param/param.h"
/*
this is used to catch debug messages from ldb
*/
static void ldb_wrap_debug(void *context, enum ldb_debug_level level,
const char *fmt, va_list ap) PRINTF_ATTRIBUTE(3,0);
static void ldb_wrap_debug(void *context, enum ldb_debug_level level,
const char *fmt, va_list ap)
{
int samba_level = -1;
char *s = NULL;
switch (level) {
case LDB_DEBUG_FATAL:
samba_level = 0;
break;
case LDB_DEBUG_ERROR:
samba_level = 1;
break;
case LDB_DEBUG_WARNING:
samba_level = 2;
break;
case LDB_DEBUG_TRACE:
samba_level = 5;
break;
};
vasprintf(&s, fmt, ap);
if (!s) return;
DEBUG(samba_level, ("ldb: %s\n", s));
free(s);
}
/* check for memory leaks on the ldb context */
static int ldb_wrap_destructor(struct ldb_context *ldb)
{
size_t *startup_blocks = (size_t *)ldb_get_opaque(ldb, "startup_blocks");
if (startup_blocks &&
talloc_total_blocks(ldb) > *startup_blocks + 400) {
DEBUG(0,("WARNING: probable memory leak in ldb %s - %lu blocks (startup %lu) %lu bytes\n",
(char *)ldb_get_opaque(ldb, "wrap_url"),
(unsigned long)talloc_total_blocks(ldb),
(unsigned long)*startup_blocks,
(unsigned long)talloc_total_size(ldb)));
#if 0
talloc_report_full(ldb, stdout);
call_backtrace();
smb_panic("probable memory leak in ldb");
#endif
}
return 0;
}
/*
wrapped connection to a ldb database
to close just talloc_free() the returned ldb_context
TODO: We need an error_string parameter
*/
struct ldb_context *ldb_wrap_connect(TALLOC_CTX *mem_ctx,
struct event_context *ev,
struct loadparm_context *lp_ctx,
const char *url,
struct auth_session_info *session_info,
struct cli_credentials *credentials,
unsigned int flags,
const char *options[])
{
struct ldb_context *ldb;
int ret;
char *real_url = NULL;
size_t *startup_blocks;
ldb = ldb_init(mem_ctx);
if (ldb == NULL) {
return NULL;
}
ldb_set_modules_dir(ldb,
talloc_asprintf(ldb, "%s/ldb", lp_modulesdir(lp_ctx)));
if (ev == NULL) {
return NULL;
}
if (ldb_set_opaque(ldb, "EventContext", ev)) {
talloc_free(ldb);
return NULL;
}
if (ldb_set_opaque(ldb, "sessionInfo", session_info)) {
talloc_free(ldb);
return NULL;
}
if (ldb_set_opaque(ldb, "credentials", credentials)) {
talloc_free(ldb);
return NULL;
}
if (ldb_set_opaque(ldb, "loadparm", lp_ctx)) {
talloc_free(ldb);
return NULL;
}
if (lp_ctx != NULL && strcmp(lp_sam_url(lp_ctx), url) == 0) {
dsdb_set_global_schema(ldb);
}
ret = ldb_register_samba_handlers(ldb);
if (ret == -1) {
talloc_free(ldb);
return NULL;
}
ldb_set_debug(ldb, ldb_wrap_debug, NULL);
ldb_set_utf8_fns(ldb, NULL, wrap_casefold);
real_url = private_path(ldb, lp_ctx, url);
if (real_url == NULL) {
talloc_free(ldb);
return NULL;
}
/* allow admins to force non-sync ldb for all databases */
if (lp_parm_bool(lp_ctx, NULL, "ldb", "nosync", false)) {
flags |= LDB_FLG_NOSYNC;
}
/* we usually want Samba databases to be private. If we later
find we need one public, we will need to add a parameter to
ldb_wrap_connect() */
ldb_set_create_perms(ldb, 0600);
ret = ldb_connect(ldb, real_url, flags, options);
if (ret != LDB_SUCCESS) {
talloc_free(ldb);
return NULL;
}
/* setup for leak detection */
ldb_set_opaque(ldb, "wrap_url", real_url);
startup_blocks = talloc(ldb, size_t);
*startup_blocks = talloc_total_blocks(ldb);
ldb_set_opaque(ldb, "startup_blocks", startup_blocks);
talloc_set_destructor(ldb, ldb_wrap_destructor);
return ldb;
}
|
