2 Unix SMB/CIFS implementation.
3 Implementation of a reliable server_exists()
4 Copyright (C) Volker Lendecke 2010
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 3 of the License, or
9 (at your option) any later version.
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.
16 You should have received a copy of the GNU General Public License
17 along with this program. If not, see <http://www.gnu.org/licenses/>.
25 #ifdef CLUSTER_SUPPORT
30 bool serverid_parent_init(void)
35 * Open the tdb in the parent process (smbd) so that our
36 * CLEAR_IF_FIRST optimization in tdb_reopen_all can properly
40 db
= tdb_wrap_open(talloc_autofree_context(),
41 lock_path("serverid.tdb"),
42 0, TDB_DEFAULT
|TDB_CLEAR_IF_FIRST
, O_RDWR
|O_CREAT
,
45 DEBUG(1, ("could not open serverid.tdb: %s\n",
52 struct serverid_data
{
57 static struct db_context
*serverid_db(void)
59 static struct db_context
*db
;
64 db
= db_open(talloc_autofree_context(), lock_path("serverid.tdb"),
65 0, TDB_DEFAULT
|TDB_CLEAR_IF_FIRST
, O_RDWR
|O_CREAT
, 0644);
69 static void serverid_fill_key(const struct server_id
*id
,
70 struct serverid_key
*key
)
74 #ifdef CLUSTER_SUPPORT
79 bool serverid_register(const struct server_id
*id
, uint32_t msg_flags
)
81 struct db_context
*db
;
82 struct serverid_key key
;
83 struct serverid_data data
;
84 struct db_record
*rec
;
85 TDB_DATA tdbkey
, tdbdata
;
94 serverid_fill_key(id
, &key
);
95 tdbkey
= make_tdb_data((uint8_t *)&key
, sizeof(key
));
97 rec
= db
->fetch_locked(db
, talloc_tos(), tdbkey
);
99 DEBUG(1, ("Could not fetch_lock serverid.tdb record\n"));
104 data
.unique_id
= id
->unique_id
;
105 data
.msg_flags
= msg_flags
;
107 tdbdata
= make_tdb_data((uint8_t *)&data
, sizeof(data
));
108 status
= rec
->store(rec
, tdbdata
, 0);
109 if (!NT_STATUS_IS_OK(status
)) {
110 DEBUG(1, ("Storing serverid.tdb record failed: %s\n",
120 bool serverid_register_self(uint32_t msg_flags
)
122 struct server_id pid
;
125 return serverid_register(&pid
, msg_flags
);
128 bool serverid_deregister(const struct server_id
*id
)
130 struct db_context
*db
;
131 struct serverid_key key
;
132 struct db_record
*rec
;
142 serverid_fill_key(id
, &key
);
143 tdbkey
= make_tdb_data((uint8_t *)&key
, sizeof(key
));
145 rec
= db
->fetch_locked(db
, talloc_tos(), tdbkey
);
147 DEBUG(1, ("Could not fetch_lock serverid.tdb record\n"));
151 status
= rec
->delete_rec(rec
);
152 if (!NT_STATUS_IS_OK(status
)) {
153 DEBUG(1, ("Deleting serverid.tdb record failed: %s\n",
163 bool serverid_deregister_self(void)
165 struct server_id pid
;
168 return serverid_deregister(&pid
);
171 struct serverid_exists_state
{
172 const struct server_id
*id
;
176 static int server_exists_parse(TDB_DATA key
, TDB_DATA data
, void *priv
)
178 struct serverid_exists_state
*state
=
179 (struct serverid_exists_state
*)priv
;
182 if (data
.dsize
!= sizeof(struct serverid_data
)) {
186 /* memcpy, data.dptr might not be aligned */
187 memcpy(&unique_id
, data
.dptr
, sizeof(unique_id
));
189 state
->exists
= (state
->id
->unique_id
== unique_id
);
193 bool serverid_exists(const struct server_id
*id
)
195 struct db_context
*db
;
196 struct serverid_exists_state state
;
197 struct serverid_key key
;
205 serverid_fill_key(id
, &key
);
206 tdbkey
= make_tdb_data((uint8_t *)&key
, sizeof(key
));
209 state
.exists
= false;
211 if (db
->parse_record(db
, tdbkey
, server_exists_parse
, &state
) == -1) {
217 static bool serverid_rec_parse(const struct db_record
*rec
,
218 struct server_id
*id
, uint32_t *msg_flags
)
220 struct serverid_key key
;
221 struct serverid_data data
;
223 if (rec
->key
.dsize
!= sizeof(key
)) {
224 DEBUG(1, ("Found invalid key length %d in serverid.tdb\n",
225 (int)rec
->key
.dsize
));
228 if (rec
->value
.dsize
!= sizeof(data
)) {
229 DEBUG(1, ("Found invalid value length %d in serverid.tdb\n",
230 (int)rec
->value
.dsize
));
234 memcpy(&key
, rec
->key
.dptr
, sizeof(key
));
235 memcpy(&data
, rec
->value
.dptr
, sizeof(data
));
238 #ifdef CLUSTER_SUPPORT
241 id
->unique_id
= data
.unique_id
;
242 *msg_flags
= data
.msg_flags
;
246 struct serverid_traverse_read_state
{
247 int (*fn
)(const struct server_id
*id
, uint32_t msg_flags
,
252 static int serverid_traverse_read_fn(struct db_record
*rec
, void *private_data
)
254 struct serverid_traverse_read_state
*state
=
255 (struct serverid_traverse_read_state
*)private_data
;
259 if (!serverid_rec_parse(rec
, &id
, &msg_flags
)) {
262 return state
->fn(&id
, msg_flags
,state
->private_data
);
265 bool serverid_traverse_read(int (*fn
)(const struct server_id
*id
,
266 uint32_t msg_flags
, void *private_data
),
269 struct db_context
*db
;
270 struct serverid_traverse_read_state state
;
277 state
.private_data
= private_data
;
278 return db
->traverse_read(db
, serverid_traverse_read_fn
, &state
);
281 struct serverid_traverse_state
{
282 int (*fn
)(struct db_record
*rec
, const struct server_id
*id
,
283 uint32_t msg_flags
, void *private_data
);
287 static int serverid_traverse_fn(struct db_record
*rec
, void *private_data
)
289 struct serverid_traverse_state
*state
=
290 (struct serverid_traverse_state
*)private_data
;
294 if (!serverid_rec_parse(rec
, &id
, &msg_flags
)) {
297 return state
->fn(rec
, &id
, msg_flags
, state
->private_data
);
300 bool serverid_traverse(int (*fn
)(struct db_record
*rec
,
301 const struct server_id
*id
,
302 uint32_t msg_flags
, void *private_data
),
305 struct db_context
*db
;
306 struct serverid_traverse_state state
;
313 state
.private_data
= private_data
;
314 return db
->traverse(db
, serverid_traverse_fn
, &state
);