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)) {
187 * Use memcmp, not direct compare. data.dptr might not be
191 (memcmp(&unique_id, data.dptr, sizeof(unique_id)) == 0);
195 bool serverid_exists(const struct server_id *id)
197 struct db_context *db;
198 struct serverid_exists_state state;
199 struct serverid_key key;
207 serverid_fill_key(id, &key);
208 tdbkey = make_tdb_data((uint8_t *)&key, sizeof(key));
211 state.exists = false;
213 if (db->parse_record(db, tdbkey, server_exists_parse, &state) == -1) {
219 static bool serverid_rec_parse(const struct db_record *rec,
220 struct server_id *id, uint32_t *msg_flags)
222 struct serverid_key key;
223 struct serverid_data data;
225 if (rec->key.dsize != sizeof(key)) {
226 DEBUG(1, ("Found invalid key length %d in serverid.tdb\n",
227 (int)rec->key.dsize));
230 if (rec->value.dsize != sizeof(data)) {
231 DEBUG(1, ("Found invalid value length %d in serverid.tdb\n",
232 (int)rec->value.dsize));
236 memcpy(&key, rec->key.dptr, sizeof(key));
237 memcpy(&data, rec->value.dptr, sizeof(data));
240 #ifdef CLUSTER_SUPPORT
243 id->unique_id = data.unique_id;
244 *msg_flags = data.msg_flags;
248 struct serverid_traverse_read_state {
249 int (*fn)(const struct server_id *id, uint32_t msg_flags,
254 static int serverid_traverse_read_fn(struct db_record *rec, void *private_data)
256 struct serverid_traverse_read_state *state =
257 (struct serverid_traverse_read_state *)private_data;
261 if (!serverid_rec_parse(rec, &id, &msg_flags)) {
264 return state->fn(&id, msg_flags,state->private_data);
267 bool serverid_traverse_read(int (*fn)(const struct server_id *id,
268 uint32_t msg_flags, void *private_data),
271 struct db_context *db;
272 struct serverid_traverse_read_state state;
279 state.private_data = private_data;
280 return db->traverse_read(db, serverid_traverse_read_fn, &state);
283 struct serverid_traverse_state {
284 int (*fn)(struct db_record *rec, const struct server_id *id,
285 uint32_t msg_flags, void *private_data);
289 static int serverid_traverse_fn(struct db_record *rec, void *private_data)
291 struct serverid_traverse_state *state =
292 (struct serverid_traverse_state *)private_data;
296 if (!serverid_rec_parse(rec, &id, &msg_flags)) {
299 return state->fn(rec, &id, msg_flags, state->private_data);
302 bool serverid_traverse(int (*fn)(struct db_record *rec,
303 const struct server_id *id,
304 uint32_t msg_flags, void *private_data),
307 struct db_context *db;
308 struct serverid_traverse_state state;
315 state.private_data = private_data;
316 return db->traverse(db, serverid_traverse_fn, &state);