2 Unix SMB/CIFS implementation.
4 database wrap functions
6 Copyright (C) Andrew Tridgell 2004
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 2 of the License, or
11 (at your option) any later version.
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.
18 You should have received a copy of the GNU General Public License
19 along with this program; if not, write to the Free Software
20 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
24 the stupidity of the unix fcntl locking design forces us to never
25 allow a database file to be opened twice in the same process. These
26 wrappers provide convenient access to a tdb or ldb, taking advantage
27 of talloc destructors to ensure that only a single open is done
31 #include "dlinklist.h"
32 #include "lib/tdb/include/tdb.h"
33 #include "lib/ldb/include/ldb.h"
37 struct ldb_context *ldb;
40 struct ldb_wrap *next, *prev;
43 static struct ldb_wrap *ldb_list;
44 static struct tdb_wrap *tdb_list;
47 this is used to catch debug messages from ldb
49 static void ldb_wrap_debug(void *context, enum ldb_debug_level level,
50 const char *fmt, va_list ap) PRINTF_ATTRIBUTE(3,0);
52 static void ldb_wrap_debug(void *context, enum ldb_debug_level level,
53 const char *fmt, va_list ap)
56 if (DEBUGLEVEL < 4 && level > LDB_DEBUG_WARNING) {
59 vasprintf(&s, fmt, ap);
61 DEBUG(level, ("ldb: %s\n", s));
65 /* destroy the last connection to a ldb */
66 static int ldb_wrap_destructor(void *ctx)
68 struct ldb_wrap *w = ctx;
69 DLIST_REMOVE(ldb_list, w);
74 wrapped connection to a ldb database
75 to close just talloc_free() the returned ldb_context
77 struct ldb_context *ldb_wrap_connect(TALLOC_CTX *mem_ctx,
80 const char *options[])
82 struct ldb_context *ldb;
85 struct event_context *ev;
88 for (w = ldb_list; w; w = w->next) {
89 if (strcmp(url, w->url) == 0) {
90 return talloc_reference(mem_ctx, w->ldb);
94 ldb = ldb_init(talloc_autofree_context());
99 /* we want to use the existing event context if possible. This
100 relies on the fact that in smbd, everything is a child of
101 the main event_context */
102 ev = talloc_find_parent_bytype(mem_ctx, struct event_context);
104 ldb_set_opaque(ldb, "EventContext", ev);
107 ret = ldb_connect(ldb, url, flags, options);
113 w = talloc(ldb, struct ldb_wrap);
120 w->url = talloc_strdup(w, url);
122 talloc_set_destructor(w, ldb_wrap_destructor);
123 ldb_set_debug(ldb, ldb_wrap_debug, NULL);
125 DLIST_ADD(ldb_list, w);
132 Log tdb messages via DEBUG().
134 static void tdb_wrap_log(TDB_CONTEXT *tdb, int level,
135 const char *format, ...) PRINTF_ATTRIBUTE(3,4);
137 static void tdb_wrap_log(TDB_CONTEXT *tdb, int level,
138 const char *format, ...)
143 va_start(ap, format);
144 vasprintf(&ptr, format, ap);
148 DEBUG(level, ("tdb(%s): %s", tdb->name ? tdb->name : "unnamed", ptr));
154 /* destroy the last connection to a tdb */
155 static int tdb_wrap_destructor(void *ctx)
157 struct tdb_wrap *w = ctx;
159 DLIST_REMOVE(tdb_list, w);
164 wrapped connection to a tdb database
165 to close just talloc_free() the tdb_wrap pointer
167 struct tdb_wrap *tdb_wrap_open(TALLOC_CTX *mem_ctx,
168 const char *name, int hash_size, int tdb_flags,
169 int open_flags, mode_t mode)
173 for (w=tdb_list;w;w=w->next) {
174 if (strcmp(name, w->name) == 0) {
175 return talloc_reference(mem_ctx, w);
179 w = talloc(mem_ctx, struct tdb_wrap);
184 w->name = talloc_strdup(w, name);
186 w->tdb = tdb_open_ex(name, hash_size, tdb_flags,
187 open_flags, mode, tdb_wrap_log, NULL);
188 if (w->tdb == NULL) {
193 talloc_set_destructor(w, tdb_wrap_destructor);
195 DLIST_ADD(tdb_list, w);