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/>.
26 #ifdef CLUSTER_SUPPORT
31 struct serverid_data {
36 bool serverid_parent_init(TALLOC_CTX *mem_ctx)
41 * Open the tdb in the parent process (smbd) so that our
42 * CLEAR_IF_FIRST optimization in tdb_reopen_all can properly
46 db = tdb_wrap_open(mem_ctx, lock_path("serverid.tdb"),
47 0, TDB_DEFAULT|TDB_CLEAR_IF_FIRST, O_RDWR|O_CREAT,
50 DEBUG(1, ("could not open serverid.tdb: %s\n",
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_msg_flags(const struct server_id id, bool do_reg,
123 struct db_context *db;
124 struct serverid_key key;
125 struct serverid_data *data;
126 struct db_record *rec;
136 serverid_fill_key(&id, &key);
137 tdbkey = make_tdb_data((uint8_t *)&key, sizeof(key));
139 rec = db->fetch_locked(db, talloc_tos(), tdbkey);
141 DEBUG(1, ("Could not fetch_lock serverid.tdb record\n"));
145 if (rec->value.dsize != sizeof(struct serverid_data)) {
146 DEBUG(1, ("serverid record has unexpected size %d "
147 "(wanted %d)\n", (int)rec->value.dsize,
148 (int)sizeof(struct serverid_data)));
152 data = (struct serverid_data *)rec->value.dptr;
155 data->msg_flags |= msg_flags;
157 data->msg_flags &= ~msg_flags;
160 status = rec->store(rec, rec->value, 0);
161 if (!NT_STATUS_IS_OK(status)) {
162 DEBUG(1, ("Storing serverid.tdb record failed: %s\n",
172 bool serverid_deregister(struct server_id id)
174 struct db_context *db;
175 struct serverid_key key;
176 struct db_record *rec;
186 serverid_fill_key(&id, &key);
187 tdbkey = make_tdb_data((uint8_t *)&key, sizeof(key));
189 rec = db->fetch_locked(db, talloc_tos(), tdbkey);
191 DEBUG(1, ("Could not fetch_lock serverid.tdb record\n"));
195 status = rec->delete_rec(rec);
196 if (!NT_STATUS_IS_OK(status)) {
197 DEBUG(1, ("Deleting serverid.tdb record failed: %s\n",
207 struct serverid_exists_state {
208 const struct server_id *id;
212 static int server_exists_parse(TDB_DATA key, TDB_DATA data, void *priv)
214 struct serverid_exists_state *state =
215 (struct serverid_exists_state *)priv;
217 if (data.dsize != sizeof(struct serverid_data)) {
222 * Use memcmp, not direct compare. data.dptr might not be
225 state->exists = (memcmp(&state->id->unique_id, data.dptr,
226 sizeof(state->id->unique_id)) == 0);
230 bool serverid_exists(const struct server_id *id)
232 struct db_context *db;
233 struct serverid_exists_state state;
234 struct serverid_key key;
242 serverid_fill_key(id, &key);
243 tdbkey = make_tdb_data((uint8_t *)&key, sizeof(key));
246 state.exists = false;
248 if (db->parse_record(db, tdbkey, server_exists_parse, &state) == -1) {
254 static bool serverid_rec_parse(const struct db_record *rec,
255 struct server_id *id, uint32_t *msg_flags)
257 struct serverid_key key;
258 struct serverid_data data;
260 if (rec->key.dsize != sizeof(key)) {
261 DEBUG(1, ("Found invalid key length %d in serverid.tdb\n",
262 (int)rec->key.dsize));
265 if (rec->value.dsize != sizeof(data)) {
266 DEBUG(1, ("Found invalid value length %d in serverid.tdb\n",
267 (int)rec->value.dsize));
271 memcpy(&key, rec->key.dptr, sizeof(key));
272 memcpy(&data, rec->value.dptr, sizeof(data));
275 #ifdef CLUSTER_SUPPORT
278 id->unique_id = data.unique_id;
279 *msg_flags = data.msg_flags;
283 struct serverid_traverse_read_state {
284 int (*fn)(const struct server_id *id, uint32_t msg_flags,
289 static int serverid_traverse_read_fn(struct db_record *rec, void *private_data)
291 struct serverid_traverse_read_state *state =
292 (struct serverid_traverse_read_state *)private_data;
296 if (!serverid_rec_parse(rec, &id, &msg_flags)) {
299 return state->fn(&id, msg_flags,state->private_data);
302 bool serverid_traverse_read(int (*fn)(const struct server_id *id,
303 uint32_t msg_flags, void *private_data),
306 struct db_context *db;
307 struct serverid_traverse_read_state state;
314 state.private_data = private_data;
315 return db->traverse_read(db, serverid_traverse_read_fn, &state);
318 struct serverid_traverse_state {
319 int (*fn)(struct db_record *rec, const struct server_id *id,
320 uint32_t msg_flags, void *private_data);
324 static int serverid_traverse_fn(struct db_record *rec, void *private_data)
326 struct serverid_traverse_state *state =
327 (struct serverid_traverse_state *)private_data;
331 if (!serverid_rec_parse(rec, &id, &msg_flags)) {
334 return state->fn(rec, &id, msg_flags, state->private_data);
337 bool serverid_traverse(int (*fn)(struct db_record *rec,
338 const struct server_id *id,
339 uint32_t msg_flags, void *private_data),
342 struct db_context *db;
343 struct serverid_traverse_state state;
350 state.private_data = private_data;
351 return db->traverse(db, serverid_traverse_fn, &state);