source3/lib/dbwrap_tdb.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    Database interface wrapper around tdb
   4    Copyright (C) Volker Lendecke 2005-2007
   5
   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.
  10
  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.
  15
  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/>.
  18 */
  19
  20 #include "includes.h"
  21
  22 struct db_tdb_ctx {
  23         struct tdb_wrap *wtdb;
  24 };
  25
  26 static NTSTATUS db_tdb_store(struct db_record *rec, TDB_DATA data, int flag);
  27 static NTSTATUS db_tdb_delete(struct db_record *rec);
  28
  29 static int db_tdb_record_destr(struct db_record* data)
  30 {
  31         struct db_tdb_ctx *ctx =
  32                 talloc_get_type_abort(data->private_data, struct db_tdb_ctx);
  33
  34         DEBUG(10, (DEBUGLEVEL > 10
  35                    ? "Unlocking key %s\n" : "Unlocking key %.20s\n",
  36                    hex_encode(data, (unsigned char *)data->key.dptr,
  37                               data->key.dsize)));
  38
  39         if (tdb_chainunlock(ctx->wtdb->tdb, data->key) != 0) {
  40                 DEBUG(0, ("tdb_chainunlock failed\n"));
  41                 return -1;
  42         }
  43         return 0;
  44 }
  45
  46 static struct db_record *db_tdb_fetch_locked(struct db_context *db,
  47                                      TALLOC_CTX *mem_ctx, TDB_DATA key)
  48 {
  49         struct db_tdb_ctx *ctx = talloc_get_type_abort(db->private_data,
  50                                                        struct db_tdb_ctx);
  51         struct db_record *result;
  52         TDB_DATA value;
  53
  54         result = TALLOC_P(mem_ctx, struct db_record);
  55         if (result == NULL) {
  56                 DEBUG(0, ("talloc failed\n"));
  57                 return NULL;
  58         }
  59
  60         result->key.dsize = key.dsize;
  61         result->key.dptr = (uint8 *)talloc_memdup(result, key.dptr, key.dsize);
  62         if (result->key.dptr == NULL) {
  63                 DEBUG(0, ("talloc failed\n"));
  64                 TALLOC_FREE(result);
  65                 return NULL;
  66         }
  67
  68         result->value.dptr = NULL;
  69         result->value.dsize = 0;
  70         result->private_data = talloc_reference(result, ctx);
  71         result->store = db_tdb_store;
  72         result->delete_rec = db_tdb_delete;
  73
  74         if (DEBUGLEVEL >= 10) {
  75                 char *keystr = hex_encode(NULL, key.dptr, key.dsize);
  76                 DEBUG(10, (DEBUGLEVEL > 10
  77                            ? "Locking key %s\n" : "Locking key %.20s\n",
  78                            keystr));
  79                 TALLOC_FREE(keystr);
  80         }
  81
  82         if (tdb_chainlock(ctx->wtdb->tdb, key) != 0) {
  83                 DEBUG(3, ("tdb_chainlock failed\n"));
  84                 TALLOC_FREE(result);
  85                 return NULL;
  86         }
  87
  88         talloc_set_destructor(result, db_tdb_record_destr);
  89
  90         value = tdb_fetch(ctx->wtdb->tdb, key);
  91
  92         if (value.dptr == NULL) {
  93                 return result;
  94         }
  95
  96         result->value.dsize = value.dsize;
  97         result->value.dptr = (uint8 *)talloc_memdup(result, value.dptr,
  98                                                     value.dsize);
  99         if (result->value.dptr == NULL) {
 100                 DEBUG(3, ("talloc failed\n"));
 101                 TALLOC_FREE(result);
 102                 return NULL;
 103         }
 104
 105         SAFE_FREE(value.dptr);
 106
 107         DEBUG(10, ("Allocated locked data 0x%p\n", result));
 108
 109         return result;
 110 }
 111
 112 static NTSTATUS db_tdb_store(struct db_record *rec, TDB_DATA data, int flag)
 113 {
 114         struct db_tdb_ctx *ctx = talloc_get_type_abort(rec->private_data,
 115                                                        struct db_tdb_ctx);
 116
 117         /*
 118          * This has a bug: We need to replace rec->value for correct
 119          * operation, but right now brlock and locking don't use the value
 120          * anymore after it was stored.
 121          */
 122
 123         return (tdb_store(ctx->wtdb->tdb, rec->key, data, flag) == 0) ?
 124                 NT_STATUS_OK : NT_STATUS_UNSUCCESSFUL;
 125 }
 126
 127 static NTSTATUS db_tdb_delete(struct db_record *rec)
 128 {
 129         struct db_tdb_ctx *ctx = talloc_get_type_abort(rec->private_data,
 130                                                        struct db_tdb_ctx);
 131         int res;
 132
 133         res = tdb_delete(ctx->wtdb->tdb, rec->key);
 134
 135         if (res == 0) {
 136                 return NT_STATUS_OK;
 137         }
 138
 139         return map_nt_error_from_tdb(tdb_error(ctx->wtdb->tdb));
 140 }
 141
 142 struct db_tdb_traverse_ctx {
 143         struct db_context *db;
 144         int (*f)(struct db_record *rec, void *private_data);
 145         void *private_data;
 146 };
 147
 148 static int db_tdb_traverse_func(TDB_CONTEXT *tdb, TDB_DATA kbuf, TDB_DATA dbuf,
 149                                 void *private_data)
 150 {
 151         struct db_tdb_traverse_ctx *ctx =
 152                 (struct db_tdb_traverse_ctx *)private_data;
 153         struct db_record rec;
 154
 155         rec.key = kbuf;
 156         rec.value = dbuf;
 157         rec.store = db_tdb_store;
 158         rec.delete_rec = db_tdb_delete;
 159         rec.private_data = ctx->db->private_data;
 160
 161         return ctx->f(&rec, ctx->private_data);
 162 }
 163
 164 static int db_tdb_traverse(struct db_context *db,
 165                            int (*f)(struct db_record *rec, void *private_data),
 166                            void *private_data)
 167 {
 168         struct db_tdb_ctx *db_ctx =
 169                 talloc_get_type_abort(db->private_data, struct db_tdb_ctx);
 170         struct db_tdb_traverse_ctx ctx;
 171
 172         ctx.db = db;
 173         ctx.f = f;
 174         ctx.private_data = private_data;
 175         return tdb_traverse(db_ctx->wtdb->tdb, db_tdb_traverse_func, &ctx);
 176 }
 177
 178 static NTSTATUS db_tdb_store_deny(struct db_record *rec, TDB_DATA data, int flag)
 179 {
 180         return NT_STATUS_MEDIA_WRITE_PROTECTED;
 181 }
 182
 183 static NTSTATUS db_tdb_delete_deny(struct db_record *rec)
 184 {
 185         return NT_STATUS_MEDIA_WRITE_PROTECTED;
 186 }
 187
 188 static int db_tdb_traverse_read_func(TDB_CONTEXT *tdb, TDB_DATA kbuf, TDB_DATA dbuf,
 189                                 void *private_data)
 190 {
 191         struct db_tdb_traverse_ctx *ctx =
 192                 (struct db_tdb_traverse_ctx *)private_data;
 193         struct db_record rec;
 194
 195         rec.key = kbuf;
 196         rec.value = dbuf;
 197         rec.store = db_tdb_store_deny;
 198         rec.delete_rec = db_tdb_delete_deny;
 199         rec.private_data = ctx->db->private_data;
 200
 201         return ctx->f(&rec, ctx->private_data);
 202 }
 203
 204 static int db_tdb_traverse_read(struct db_context *db,
 205                            int (*f)(struct db_record *rec, void *private_data),
 206                            void *private_data)
 207 {
 208         struct db_tdb_ctx *db_ctx =
 209                 talloc_get_type_abort(db->private_data, struct db_tdb_ctx);
 210         struct db_tdb_traverse_ctx ctx;
 211
 212         ctx.db = db;
 213         ctx.f = f;
 214         ctx.private_data = private_data;
 215         return tdb_traverse_read(db_ctx->wtdb->tdb, db_tdb_traverse_read_func, &ctx);
 216 }
 217
 218 static int db_tdb_get_seqnum(struct db_context *db)
 219
 220 {
 221         struct db_tdb_ctx *db_ctx =
 222                 talloc_get_type_abort(db->private_data, struct db_tdb_ctx);
 223         return tdb_get_seqnum(db_ctx->wtdb->tdb);
 224 }
 225
 226 struct db_context *db_open_tdb(TALLOC_CTX *mem_ctx,
 227                                const char *name,
 228                                int hash_size, int tdb_flags,
 229                                int open_flags, mode_t mode)
 230 {
 231         struct db_context *result = NULL;
 232         struct db_tdb_ctx *db_tdb;
 233
 234         result = TALLOC_ZERO_P(mem_ctx, struct db_context);
 235         if (result == NULL) {
 236                 DEBUG(0, ("talloc failed\n"));
 237                 goto fail;
 238         }
 239
 240         result->private_data = db_tdb = TALLOC_P(result, struct db_tdb_ctx);
 241         if (db_tdb == NULL) {
 242                 DEBUG(0, ("talloc failed\n"));
 243                 goto fail;
 244         }
 245
 246         db_tdb->wtdb = tdb_wrap_open(db_tdb, name, hash_size, tdb_flags,
 247                                      open_flags, mode);
 248         if (db_tdb->wtdb == NULL) {
 249                 DEBUG(3, ("Could not open tdb: %s\n", strerror(errno)));
 250                 goto fail;
 251         }
 252
 253         result->fetch_locked = db_tdb_fetch_locked;
 254         result->traverse = db_tdb_traverse;
 255         result->traverse_read = db_tdb_traverse_read;
 256         result->get_seqnum = db_tdb_get_seqnum;
 257         return result;
 258
 259  fail:
 260         if (result != NULL) {
 261                 TALLOC_FREE(result);
 262         }
 263         return NULL;
 264 }