2 Unix SMB/CIFS implementation.
3 Database interface wrapper
4 Copyright (C) Jim McDonough <jmcd@us.ibm.com> 2006
6 Major code contributions from Aleksey Fedoseev (fedoseev@ru.ibm.com)
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.
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, see <http://www.gnu.org/licenses/>.
23 #include "dbwrap/dbwrap.h"
24 #include "dbwrap/dbwrap_private.h"
28 * Fall back using fetch_locked if no genuine fetch operation is provided
31 static NTSTATUS dbwrap_fallback_fetch(struct db_context *db,
33 TDB_DATA key, TDB_DATA *data)
35 struct db_record *rec;
37 rec = dbwrap_fetch_locked(db, mem_ctx, key);
39 return NT_STATUS_UNSUCCESSFUL;
42 data->dsize = rec->value.dsize;
43 data->dptr = talloc_move(mem_ctx, &rec->value.dptr);
49 * Fall back using fetch if no genuine exists operation is provided
52 static int dbwrap_fallback_exists(struct db_context *db, TDB_DATA key)
54 NTSTATUS status = dbwrap_parse_record(db, key, NULL, NULL);
55 return NT_STATUS_IS_OK(status) ? 1 : 0;
59 * Fall back using fetch if no genuine parse operation is provided
62 static NTSTATUS dbwrap_fallback_parse_record(struct db_context *db, TDB_DATA key,
63 void (*parser)(TDB_DATA key,
68 struct db_record *rec;
71 rec = dbwrap_fetch_locked(db, talloc_tos(), key);
73 return NT_STATUS_NOT_FOUND;
75 data = dbwrap_record_get_value(rec);
77 data.dptr = talloc_memdup(talloc_tos(), data.dptr, data.dsize);
79 if (data.dptr == NULL) {
80 return NT_STATUS_NO_MEMORY;
83 parser(key, data, private_data);
85 TALLOC_FREE(data.dptr);
90 static int delete_record(struct db_record *rec, void *data)
92 NTSTATUS status = dbwrap_record_delete(rec);
93 return NT_STATUS_IS_OK(status) ? 0 : -1;
97 * Fallback wipe implementation using traverse and delete if no genuine
98 * wipe operation is provided
100 static int dbwrap_fallback_wipe(struct db_context *db)
102 NTSTATUS status = dbwrap_trans_traverse(db, delete_record, NULL);
103 return NT_STATUS_IS_OK(status) ? 0 : -1;
108 * Wrapper functions for the backend methods
111 TDB_DATA dbwrap_record_get_key(const struct db_record *rec)
116 TDB_DATA dbwrap_record_get_value(const struct db_record *rec)
121 NTSTATUS dbwrap_record_store(struct db_record *rec, TDB_DATA data, int flags)
123 return rec->store(rec, data, flags);
126 NTSTATUS dbwrap_record_delete(struct db_record *rec)
128 return rec->delete_rec(rec);
131 struct db_record *dbwrap_fetch_locked(struct db_context *db,
135 return db->fetch_locked(db, mem_ctx, key);
138 struct dbwrap_fetch_state {
143 static void dbwrap_fetch_parser(TDB_DATA key, TDB_DATA data,
146 struct dbwrap_fetch_state *state =
147 (struct dbwrap_fetch_state *)private_data;
149 state->data.dsize = data.dsize;
150 state->data.dptr = (uint8_t *)talloc_memdup(state->mem_ctx, data.dptr,
154 NTSTATUS dbwrap_fetch(struct db_context *db, TALLOC_CTX *mem_ctx,
155 TDB_DATA key, TDB_DATA *value)
157 struct dbwrap_fetch_state state;
161 return NT_STATUS_INVALID_PARAMETER;
164 state.mem_ctx = mem_ctx;
166 status = dbwrap_parse_record(db, key, dbwrap_fetch_parser, &state);
167 if (!NT_STATUS_IS_OK(status)) {
170 if ((state.data.dsize != 0) && (state.data.dptr == NULL)) {
171 return NT_STATUS_NO_MEMORY;
177 bool dbwrap_exists(struct db_context *db, TDB_DATA key)
180 if (db->exists != NULL) {
181 result = db->exists(db, key);
183 result = dbwrap_fallback_exists(db,key);
185 return (result == 1);
188 NTSTATUS dbwrap_store(struct db_context *db, TDB_DATA key,
189 TDB_DATA data, int flags)
191 struct db_record *rec;
194 rec = dbwrap_fetch_locked(db, talloc_tos(), key);
196 return NT_STATUS_NO_MEMORY;
199 status = dbwrap_record_store(rec, data, flags);
204 NTSTATUS dbwrap_delete(struct db_context *db, TDB_DATA key)
206 struct db_record *rec;
209 rec = dbwrap_fetch_locked(db, talloc_tos(), key);
211 return NT_STATUS_NO_MEMORY;
213 status = dbwrap_record_delete(rec);
218 NTSTATUS dbwrap_traverse(struct db_context *db,
219 int (*f)(struct db_record*, void*),
223 int ret = db->traverse(db, f, private_data);
226 return NT_STATUS_INTERNAL_DB_CORRUPTION;
236 NTSTATUS dbwrap_traverse_read(struct db_context *db,
237 int (*f)(struct db_record*, void*),
241 int ret = db->traverse_read(db, f, private_data);
244 return NT_STATUS_INTERNAL_DB_CORRUPTION;
254 static void dbwrap_null_parser(TDB_DATA key, TDB_DATA val, void* data)
259 NTSTATUS dbwrap_parse_record(struct db_context *db, TDB_DATA key,
260 void (*parser)(TDB_DATA key, TDB_DATA data,
264 if (parser == NULL) {
265 parser = dbwrap_null_parser;
268 if (db->parse_record == NULL) {
269 return dbwrap_fallback_parse_record(db, key, parser,
272 return db->parse_record(db, key, parser, private_data);
275 int dbwrap_wipe(struct db_context *db)
277 if (db->wipe == NULL) {
278 return dbwrap_fallback_wipe(db);
283 int dbwrap_get_seqnum(struct db_context *db)
285 return db->get_seqnum(db);
288 int dbwrap_get_flags(struct db_context *db)
290 return db->get_flags(db);
293 int dbwrap_transaction_start(struct db_context *db)
295 return db->transaction_start(db);
298 int dbwrap_transaction_commit(struct db_context *db)
300 return db->transaction_commit(db);
303 int dbwrap_transaction_cancel(struct db_context *db)
305 return db->transaction_cancel(db);