source3/lib/dbwrap_util.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    Utility functions for the dbwrap API
   4    Copyright (C) Volker Lendecke 2007
   5    Copyright (C) Michael Adam 2009
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 2 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program; if not, write to the Free Software
  19    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  20 */
  21
  22 #include "includes.h"
  23
  24 int32_t dbwrap_fetch_int32(struct db_context *db, const char *keystr)
  25 {
  26         TDB_DATA dbuf;
  27         int32 ret;
  28
  29         if (db->fetch(db, NULL, string_term_tdb_data(keystr), &dbuf) != 0) {
  30                 return -1;
  31         }
  32
  33         if ((dbuf.dptr == NULL) || (dbuf.dsize != sizeof(int32_t))) {
  34                 TALLOC_FREE(dbuf.dptr);
  35                 return -1;
  36         }
  37
  38         ret = IVAL(dbuf.dptr, 0);
  39         TALLOC_FREE(dbuf.dptr);
  40         return ret;
  41 }
  42
  43 int dbwrap_store_int32(struct db_context *db, const char *keystr, int32_t v)
  44 {
  45         struct db_record *rec;
  46         int32 v_store;
  47         NTSTATUS status;
  48
  49         rec = db->fetch_locked(db, NULL, string_term_tdb_data(keystr));
  50         if (rec == NULL) {
  51                 return -1;
  52         }
  53
  54         SIVAL(&v_store, 0, v);
  55
  56         status = rec->store(rec, make_tdb_data((const uint8 *)&v_store,
  57                                                sizeof(v_store)),
  58                             TDB_REPLACE);
  59         TALLOC_FREE(rec);
  60         return NT_STATUS_IS_OK(status) ? 0 : -1;
  61 }
  62
  63 bool dbwrap_fetch_uint32(struct db_context *db, const char *keystr,
  64                          uint32_t *val)
  65 {
  66         TDB_DATA dbuf;
  67
  68         if (db->fetch(db, NULL, string_term_tdb_data(keystr), &dbuf) != 0) {
  69                 return false;
  70         }
  71
  72         if ((dbuf.dptr == NULL) || (dbuf.dsize != sizeof(uint32_t))) {
  73                 TALLOC_FREE(dbuf.dptr);
  74                 return false;
  75         }
  76
  77         *val = IVAL(dbuf.dptr, 0);
  78         TALLOC_FREE(dbuf.dptr);
  79         return true;
  80 }
  81
  82 int dbwrap_store_uint32(struct db_context *db, const char *keystr, uint32_t v)
  83 {
  84         struct db_record *rec;
  85         uint32 v_store;
  86         NTSTATUS status;
  87
  88         rec = db->fetch_locked(db, NULL, string_term_tdb_data(keystr));
  89         if (rec == NULL) {
  90                 return -1;
  91         }
  92
  93         SIVAL(&v_store, 0, v);
  94
  95         status = rec->store(rec, make_tdb_data((const uint8 *)&v_store,
  96                                                sizeof(v_store)),
  97                             TDB_REPLACE);
  98         TALLOC_FREE(rec);
  99         return NT_STATUS_IS_OK(status) ? 0 : -1;
 100 }
 101
 102 /**
 103  * Atomic unsigned integer change (addition):
 104  *
 105  * if value does not exist yet in the db, use *oldval as initial old value.
 106  * return old value in *oldval.
 107  * store *oldval + change_val to db.
 108  */
 109
 110 struct dbwrap_change_uint32_atomic_context {
 111         const char *keystr;
 112         uint32_t *oldval;
 113         uint32_t change_val;
 114 };
 115
 116 static NTSTATUS dbwrap_change_uint32_atomic_action(struct db_context *db,
 117                                                    void *private_data)
 118 {
 119         struct db_record *rec;
 120         uint32 val = -1;
 121         uint32_t v_store;
 122         NTSTATUS ret;
 123         struct dbwrap_change_uint32_atomic_context *state;
 124
 125         state = (struct dbwrap_change_uint32_atomic_context *)private_data;
 126
 127         rec = db->fetch_locked(db, NULL, string_term_tdb_data(state->keystr));
 128         if (!rec) {
 129                 return NT_STATUS_UNSUCCESSFUL;
 130         }
 131
 132         if (rec->value.dptr == NULL) {
 133                 val = *(state->oldval);
 134         } else if (rec->value.dsize == sizeof(val)) {
 135                 val = IVAL(rec->value.dptr, 0);
 136                 *(state->oldval) = val;
 137         } else {
 138                 ret = NT_STATUS_UNSUCCESSFUL;
 139                 goto done;
 140         }
 141
 142         val += state->change_val;
 143
 144         SIVAL(&v_store, 0, val);
 145
 146         ret = rec->store(rec,
 147                          make_tdb_data((const uint8 *)&v_store,
 148                                        sizeof(v_store)),
 149                          TDB_REPLACE);
 150
 151 done:
 152         TALLOC_FREE(rec);
 153         return ret;
 154 }
 155
 156 NTSTATUS dbwrap_change_uint32_atomic(struct db_context *db, const char *keystr,
 157                                      uint32_t *oldval, uint32_t change_val)
 158 {
 159         NTSTATUS ret;
 160         struct dbwrap_change_uint32_atomic_context state;
 161
 162         state.keystr = keystr;
 163         state.oldval = oldval;
 164         state.change_val = change_val;
 165
 166         ret = dbwrap_change_uint32_atomic_action(db, &state);
 167
 168         return ret;
 169 }
 170
 171 NTSTATUS dbwrap_trans_change_uint32_atomic(struct db_context *db,
 172                                            const char *keystr,
 173                                            uint32_t *oldval,
 174                                            uint32_t change_val)
 175 {
 176         NTSTATUS ret;
 177         struct dbwrap_change_uint32_atomic_context state;
 178
 179         state.keystr = keystr;
 180         state.oldval = oldval;
 181         state.change_val = change_val;
 182
 183         ret = dbwrap_trans_do(db, dbwrap_change_uint32_atomic_action, &state);
 184
 185         return ret;
 186 }
 187
 188 /**
 189  * Atomic integer change (addition):
 190  *
 191  * if value does not exist yet in the db, use *oldval as initial old value.
 192  * return old value in *oldval.
 193  * store *oldval + change_val to db.
 194  */
 195
 196 struct dbwrap_change_int32_atomic_context {
 197         const char *keystr;
 198         int32_t *oldval;
 199         int32_t change_val;
 200 };
 201
 202 static NTSTATUS dbwrap_change_int32_atomic_action(struct db_context *db,
 203                                                   void *private_data)
 204 {
 205         struct db_record *rec;
 206         int32_t val = -1;
 207         TDB_DATA data;
 208         NTSTATUS ret;
 209         struct dbwrap_change_int32_atomic_context *state;
 210
 211         state = (struct dbwrap_change_int32_atomic_context *)private_data;
 212
 213         rec = db->fetch_locked(db, NULL, string_term_tdb_data(state->keystr));
 214         if (!rec) {
 215                 return NT_STATUS_UNSUCCESSFUL;
 216         }
 217
 218         if (rec->value.dptr == NULL) {
 219                 val = *(state->oldval);
 220         } else if (rec->value.dsize == sizeof(val)) {
 221                 val = IVAL(rec->value.dptr, 0);
 222                 *(state->oldval) = val;
 223         } else {
 224                 ret = NT_STATUS_UNSUCCESSFUL;
 225                 goto done;
 226         }
 227
 228         val += state->change_val;
 229
 230         data.dsize = sizeof(val);
 231         data.dptr = (uint8 *)&val;
 232
 233         ret = rec->store(rec, data, TDB_REPLACE);
 234
 235 done:
 236         TALLOC_FREE(rec);
 237         return ret;
 238 }
 239
 240 NTSTATUS dbwrap_change_int32_atomic(struct db_context *db, const char *keystr,
 241                                     int32_t *oldval, int32_t change_val)
 242 {
 243         NTSTATUS ret;
 244         struct dbwrap_change_int32_atomic_context state;
 245
 246         state.keystr = keystr;
 247         state.oldval = oldval;
 248         state.change_val = change_val;
 249
 250         ret = dbwrap_change_int32_atomic_action(db, &state);
 251
 252         return ret;
 253 }
 254
 255 NTSTATUS dbwrap_trans_change_int32_atomic(struct db_context *db,
 256                                           const char *keystr,
 257                                           int32_t *oldval,
 258                                           int32_t change_val)
 259 {
 260         NTSTATUS ret;
 261         struct dbwrap_change_int32_atomic_context state;
 262
 263         state.keystr = keystr;
 264         state.oldval = oldval;
 265         state.change_val = change_val;
 266
 267         ret = dbwrap_trans_do(db, dbwrap_change_int32_atomic_action, &state);
 268
 269         return ret;
 270 }
 271
 272 struct dbwrap_store_context {
 273         TDB_DATA *key;
 274         TDB_DATA *dbuf;
 275         int flag;
 276 };
 277
 278 static NTSTATUS dbwrap_store_action(struct db_context *db, void *private_data)
 279 {
 280         struct db_record *rec = NULL;
 281         NTSTATUS status;
 282         struct dbwrap_store_context *store_ctx;
 283
 284         store_ctx = (struct dbwrap_store_context *)private_data;
 285
 286         rec = db->fetch_locked(db, talloc_tos(), *(store_ctx->key));
 287         if (rec == NULL) {
 288                 DEBUG(5, ("fetch_locked failed\n"));
 289                 return NT_STATUS_NO_MEMORY;
 290         }
 291
 292         status = rec->store(rec, *(store_ctx->dbuf), store_ctx->flag);
 293         if (!NT_STATUS_IS_OK(status)) {
 294                 DEBUG(5, ("store returned %s\n", nt_errstr(status)));
 295         }
 296
 297         TALLOC_FREE(rec);
 298         return status;
 299 }
 300
 301 NTSTATUS dbwrap_trans_store(struct db_context *db, TDB_DATA key, TDB_DATA dbuf,
 302                             int flag)
 303 {
 304         NTSTATUS status;
 305         struct dbwrap_store_context store_ctx;
 306
 307         store_ctx.key = &key;
 308         store_ctx.dbuf = &dbuf;
 309         store_ctx.flag = flag;
 310
 311         status = dbwrap_trans_do(db, dbwrap_store_action, &store_ctx);
 312
 313         return status;
 314 }
 315
 316 static NTSTATUS dbwrap_delete_action(struct db_context * db, void *private_data)
 317 {
 318         NTSTATUS status;
 319         struct db_record *rec;
 320         TDB_DATA *key = (TDB_DATA *)private_data;
 321
 322         rec = db->fetch_locked(db, talloc_tos(), *key);
 323         if (rec == NULL) {
 324                 DEBUG(5, ("fetch_locked failed\n"));
 325                 return NT_STATUS_NO_MEMORY;
 326         }
 327
 328         status = rec->delete_rec(rec);
 329         if (!NT_STATUS_IS_OK(status)) {
 330                 DEBUG(5, ("delete_rec returned %s\n", nt_errstr(status)));
 331         }
 332
 333         talloc_free(rec);
 334         return  status;
 335 }
 336
 337 NTSTATUS dbwrap_trans_delete(struct db_context *db, TDB_DATA key)
 338 {
 339         NTSTATUS status;
 340
 341         status = dbwrap_trans_do(db, dbwrap_delete_action, &key);
 342
 343         return status;
 344 }
 345
 346 NTSTATUS dbwrap_trans_store_int32(struct db_context *db, const char *keystr,
 347                                   int32_t v)
 348 {
 349         int32 v_store;
 350
 351         SIVAL(&v_store, 0, v);
 352
 353         return dbwrap_trans_store(db, string_term_tdb_data(keystr),
 354                                   make_tdb_data((const uint8 *)&v_store,
 355                                                 sizeof(v_store)),
 356                                   TDB_REPLACE);
 357 }
 358
 359 NTSTATUS dbwrap_trans_store_uint32(struct db_context *db, const char *keystr,
 360                                    uint32_t v)
 361 {
 362         uint32 v_store;
 363
 364         SIVAL(&v_store, 0, v);
 365
 366         return dbwrap_trans_store(db, string_term_tdb_data(keystr),
 367                                   make_tdb_data((const uint8 *)&v_store,
 368                                                 sizeof(v_store)),
 369                                   TDB_REPLACE);
 370 }
 371
 372 NTSTATUS dbwrap_trans_store_bystring(struct db_context *db, const char *key,
 373                                      TDB_DATA data, int flags)
 374 {
 375         return dbwrap_trans_store(db, string_term_tdb_data(key), data, flags);
 376 }
 377
 378 NTSTATUS dbwrap_trans_delete_bystring(struct db_context *db, const char *key)
 379 {
 380         return dbwrap_trans_delete(db, string_term_tdb_data(key));
 381 }
 382
 383 /**
 384  * Wrap db action(s) into a transaction.
 385  */
 386 NTSTATUS dbwrap_trans_do(struct db_context *db,
 387                          NTSTATUS (*action)(struct db_context *, void *),
 388                          void *private_data)
 389 {
 390         int res;
 391         NTSTATUS status;
 392
 393         res = db->transaction_start(db);
 394         if (res != 0) {
 395                 DEBUG(5, ("transaction_start failed\n"));
 396                 return NT_STATUS_INTERNAL_DB_CORRUPTION;
 397         }
 398
 399         status = action(db, private_data);
 400         if (!NT_STATUS_IS_OK(status)) {
 401                 if (db->transaction_cancel(db) != 0) {
 402                         smb_panic("Cancelling transaction failed");
 403                 }
 404                 return status;
 405         }
 406
 407         res = db->transaction_commit(db);
 408         if (res == 0) {
 409                 return NT_STATUS_OK;
 410         }
 411
 412         DEBUG(2, ("transaction_commit failed\n"));
 413         return NT_STATUS_INTERNAL_DB_CORRUPTION;
 414 }
 415
 416 NTSTATUS dbwrap_delete_bystring_upper(struct db_context *db, const char *key)
 417 {
 418         char *key_upper;
 419         NTSTATUS status;
 420
 421         key_upper = talloc_strdup_upper(talloc_tos(), key);
 422         if (key_upper == NULL) {
 423                 return NT_STATUS_NO_MEMORY;
 424         }
 425
 426         status = dbwrap_delete_bystring(db, key_upper);
 427
 428         talloc_free(key_upper);
 429         return status;
 430 }
 431
 432 NTSTATUS dbwrap_store_bystring_upper(struct db_context *db, const char *key,
 433                                      TDB_DATA data, int flags)
 434 {
 435         char *key_upper;
 436         NTSTATUS status;
 437
 438         key_upper = talloc_strdup_upper(talloc_tos(), key);
 439         if (key_upper == NULL) {
 440                 return NT_STATUS_NO_MEMORY;
 441         }
 442
 443         status = dbwrap_store_bystring(db, key_upper, data, flags);
 444
 445         talloc_free(key_upper);
 446         return status;
 447 }
 448
 449 TDB_DATA dbwrap_fetch_bystring_upper(struct db_context *db, TALLOC_CTX *mem_ctx,
 450                                      const char *key)
 451 {
 452         char *key_upper;
 453         TDB_DATA result;
 454
 455         key_upper = talloc_strdup_upper(talloc_tos(), key);
 456         if (key_upper == NULL) {
 457                 return make_tdb_data(NULL, 0);
 458         }
 459
 460         result = dbwrap_fetch_bystring(db, mem_ctx, key_upper);
 461
 462         talloc_free(key_upper);
 463         return result;
 464 }