source: vendor/3.5.5/source4/lib/ldb_wrap.c

Last change on this file was 414, checked in by Herwig Bauernfeind, 16 years ago

Samba 3.5.0: Initial import
File size: 5.1 KB
Line 
1/*
2 Unix SMB/CIFS implementation.
3
4 LDB wrap functions
5
6 Copyright (C) Andrew Tridgell 2004
7
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 3 of the License, or
11 (at your option) any later version.
12
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
17
18 You should have received a copy of the GNU General Public License
19 along with this program. If not, see <http://www.gnu.org/licenses/>.
20*/
21
22/*
23 the stupidity of the unix fcntl locking design forces us to never
24 allow a database file to be opened twice in the same process. These
25 wrappers provide convenient access to a tdb or ldb, taking advantage
26 of talloc destructors to ensure that only a single open is done
27*/
28
29#include "includes.h"
30#include "lib/events/events.h"
31#include "lib/ldb/include/ldb.h"
32#include "lib/ldb/include/ldb_errors.h"
33#include "lib/ldb-samba/ldif_handlers.h"
34#include "ldb_wrap.h"
35#include "dsdb/samdb/samdb.h"
36#include "param/param.h"
37
38/*
39 this is used to catch debug messages from ldb
40*/
41static void ldb_wrap_debug(void *context, enum ldb_debug_level level,
42 const char *fmt, va_list ap) PRINTF_ATTRIBUTE(3,0);
43
44static void ldb_wrap_debug(void *context, enum ldb_debug_level level,
45 const char *fmt, va_list ap)
46{
47 int samba_level = -1;
48 char *s = NULL;
49 switch (level) {
50 case LDB_DEBUG_FATAL:
51 samba_level = 0;
52 break;
53 case LDB_DEBUG_ERROR:
54 samba_level = 1;
55 break;
56 case LDB_DEBUG_WARNING:
57 samba_level = 2;
58 break;
59 case LDB_DEBUG_TRACE:
60 samba_level = 5;
61 break;
62
63 };
64 vasprintf(&s, fmt, ap);
65 if (!s) return;
66 DEBUG(samba_level, ("ldb: %s\n", s));
67 free(s);
68}
69
70/* check for memory leaks on the ldb context */
71static int ldb_wrap_destructor(struct ldb_context *ldb)
72{
73 size_t *startup_blocks = (size_t *)ldb_get_opaque(ldb, "startup_blocks");
74
75 if (startup_blocks &&
76 talloc_total_blocks(ldb) > *startup_blocks + 400) {
77 DEBUG(0,("WARNING: probable memory leak in ldb %s - %lu blocks (startup %lu) %lu bytes\n",
78 (char *)ldb_get_opaque(ldb, "wrap_url"),
79 (unsigned long)talloc_total_blocks(ldb),
80 (unsigned long)*startup_blocks,
81 (unsigned long)talloc_total_size(ldb)));
82#if 0
83 talloc_report_full(ldb, stdout);
84 call_backtrace();
85 smb_panic("probable memory leak in ldb");
86#endif
87 }
88 return 0;
89}
90
91/*
92 wrapped connection to a ldb database
93 to close just talloc_free() the returned ldb_context
94
95 TODO: We need an error_string parameter
96 */
97struct ldb_context *ldb_wrap_connect(TALLOC_CTX *mem_ctx,
98 struct tevent_context *ev,
99 struct loadparm_context *lp_ctx,
100 const char *url,
101 struct auth_session_info *session_info,
102 struct cli_credentials *credentials,
103 unsigned int flags,
104 const char *options[])
105{
106 struct ldb_context *ldb;
107 int ret;
108 char *real_url = NULL;
109 size_t *startup_blocks;
110
111 /* we want to use the existing event context if possible. This
112 relies on the fact that in smbd, everything is a child of
113 the main event_context */
114 if (ev == NULL) {
115 return NULL;
116 }
117
118 ldb = ldb_init(mem_ctx, ev);
119 if (ldb == NULL) {
120 return NULL;
121 }
122
123 ldb_set_modules_dir(ldb,
124 talloc_asprintf(ldb,
125 "%s/ldb",
126 lp_modulesdir(lp_ctx)));
127
128 if (ldb_set_opaque(ldb, "sessionInfo", session_info)) {
129 talloc_free(ldb);
130 return NULL;
131 }
132
133 if (ldb_set_opaque(ldb, "credentials", credentials)) {
134 talloc_free(ldb);
135 return NULL;
136 }
137
138 if (ldb_set_opaque(ldb, "loadparm", lp_ctx)) {
139 talloc_free(ldb);
140 return NULL;
141 }
142
143 /* This must be done before we load the schema, as these
144 * handlers for objectSid and objectGUID etc must take
145 * precedence over the 'binary attribute' declaration in the
146 * schema */
147 ret = ldb_register_samba_handlers(ldb);
148 if (ret == -1) {
149 talloc_free(ldb);
150 return NULL;
151 }
152
153 if (lp_ctx != NULL && strcmp(lp_sam_url(lp_ctx), url) == 0) {
154 dsdb_set_global_schema(ldb);
155 }
156
157 ldb_set_debug(ldb, ldb_wrap_debug, NULL);
158
159 ldb_set_utf8_fns(ldb, NULL, wrap_casefold);
160
161 real_url = private_path(ldb, lp_ctx, url);
162 if (real_url == NULL) {
163 talloc_free(ldb);
164 return NULL;
165 }
166
167 /* allow admins to force non-sync ldb for all databases */
168 if (lp_parm_bool(lp_ctx, NULL, "ldb", "nosync", false)) {
169 flags |= LDB_FLG_NOSYNC;
170 }
171
172 if (DEBUGLVL(10)) {
173 flags |= LDB_FLG_ENABLE_TRACING;
174 }
175
176 /* we usually want Samba databases to be private. If we later
177 find we need one public, we will need to add a parameter to
178 ldb_wrap_connect() */
179 ldb_set_create_perms(ldb, 0600);
180
181 ret = ldb_connect(ldb, real_url, flags, options);
182 if (ret != LDB_SUCCESS) {
183 talloc_free(ldb);
184 return NULL;
185 }
186
187 /* setup for leak detection */
188 ldb_set_opaque(ldb, "wrap_url", real_url);
189 startup_blocks = talloc(ldb, size_t);
190 *startup_blocks = talloc_total_blocks(ldb);
191 ldb_set_opaque(ldb, "startup_blocks", startup_blocks);
192
193 talloc_set_destructor(ldb, ldb_wrap_destructor);
194
195 return ldb;
196}
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