source/lib/dbwrap.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    Database interface wrapper
   4    Copyright (C) Jim McDonough <jmcd@us.ibm.com> 2006
   5
   6    Major code contributions from Aleksey Fedoseev (fedoseev@ru.ibm.com)
   7
   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.
  12
  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.
  17
  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/>.
  20 */
  21
  22 #include "includes.h"
  23 #ifdef CLUSTER_SUPPORT
  24 #include "ctdb_private.h"
  25 #endif
  26 /*
  27  * Fall back using fetch_locked if no genuine fetch operation is provided
  28  */
  29
  30 static int dbwrap_fallback_fetch(struct db_context *db, TALLOC_CTX *mem_ctx,
  31                                  TDB_DATA key, TDB_DATA *data)
  32 {
  33         struct db_record *rec;
  34
  35         if (!(rec = db->fetch_locked(db, mem_ctx, key))) {
  36                 return -1;
  37         }
  38
  39         data->dsize = rec->value.dsize;
  40         data->dptr = talloc_move(mem_ctx, &rec->value.dptr);
  41         TALLOC_FREE(rec);
  42         return 0;
  43 }
  44
  45 /**
  46  * If you need transaction support use db_open_trans()
  47  */
  48 struct db_context *db_open(TALLOC_CTX *mem_ctx,
  49                            const char *name,
  50                            int hash_size, int tdb_flags,
  51                            int open_flags, mode_t mode)
  52 {
  53         struct db_context *result = NULL;
  54 #ifdef CLUSTER_SUPPORT
  55         const char *sockname = lp_ctdbd_socket();
  56 #endif
  57
  58 #ifdef CLUSTER_SUPPORT
  59         if(!sockname || !*sockname) {
  60                 sockname = CTDB_PATH;
  61         }
  62
  63         if (lp_clustering() && socket_exist(sockname)) {
  64                 const char *partname;
  65                 /* ctdb only wants the file part of the name */
  66                 partname = strrchr(name, '/');
  67                 if (partname) {
  68                         partname++;
  69                 } else {
  70                         partname = name;
  71                 }
  72                 /* allow ctdb for individual databases to be disabled */
  73                 if (lp_parm_bool(-1, "ctdb", partname, True)) {
  74                         result = db_open_ctdb(mem_ctx, partname, hash_size,
  75                                               tdb_flags, open_flags, mode);
  76                         if (result == NULL) {
  77                                 DEBUG(0,("failed to attach to ctdb %s\n",
  78                                          partname));
  79                                 smb_panic("failed to attach to a ctdb "
  80                                           "database");
  81                         }
  82                 }
  83         }
  84
  85 #endif
  86
  87         if (result == NULL) {
  88                 result = db_open_tdb(mem_ctx, name, hash_size,
  89                                      tdb_flags, open_flags, mode);
  90         }
  91
  92         if ((result != NULL) && (result->fetch == NULL)) {
  93                 result->fetch = dbwrap_fallback_fetch;
  94         }
  95
  96         return result;
  97 }
  98
  99 /**
 100  * If you use this you can only modify with a transaction
 101  */
 102 struct db_context *db_open_trans(TALLOC_CTX *mem_ctx,
 103                                  const char *name,
 104                                  int hash_size, int tdb_flags,
 105                                  int open_flags, mode_t mode)
 106 {
 107         bool use_tdb2 = lp_parm_bool(-1, "dbwrap", "use_tdb2", false);
 108 #ifdef CLUSTER_SUPPORT
 109         const char *sockname = lp_ctdbd_socket();
 110 #endif
 111
 112         if (tdb_flags & TDB_CLEAR_IF_FIRST) {
 113                 DEBUG(0,("db_open_trans: called with TDB_CLEAR_IF_FIRST: %s\n",
 114                          name));
 115                 smb_panic("db_open_trans: called with TDB_CLEAR_IF_FIRST");
 116         }
 117
 118 #ifdef CLUSTER_SUPPORT
 119         if(!sockname || !*sockname) {
 120                 sockname = CTDB_PATH;
 121         }
 122
 123         if (lp_clustering() && socket_exist(sockname)) {
 124                 const char *partname;
 125                 /* ctdb only wants the file part of the name */
 126                 partname = strrchr(name, '/');
 127                 if (partname) {
 128                         partname++;
 129                 } else {
 130                         partname = name;
 131                 }
 132                 /* allow ctdb for individual databases to be disabled */
 133                 if (lp_parm_bool(-1, "ctdb", partname, true)) {
 134                         struct db_context *result = NULL;
 135                         result = db_open_ctdb(mem_ctx, partname, hash_size,
 136                                               tdb_flags, open_flags, mode);
 137                         if (result == NULL) {
 138                                 DEBUG(0,("failed to attach to ctdb %s\n",
 139                                          partname));
 140                                 smb_panic("failed to attach to a ctdb "
 141                                           "database");
 142                         }
 143                         return result;
 144                 }
 145         }
 146 #endif
 147
 148         if (use_tdb2) {
 149                 const char *partname;
 150                 /* tdb2 only wants the file part of the name */
 151                 partname = strrchr(name, '/');
 152                 if (partname) {
 153                         partname++;
 154                 } else {
 155                         partname = name;
 156                 }
 157                 /* allow ctdb for individual databases to be disabled */
 158                 if (lp_parm_bool(-1, "tdb2", partname, true)) {
 159                         return db_open_tdb2(mem_ctx, partname, hash_size,
 160                                             tdb_flags, open_flags, mode);
 161                 }
 162         }
 163
 164         return db_open_tdb(mem_ctx, name, hash_size,
 165                            tdb_flags, open_flags, mode);
 166 }
 167
 168 NTSTATUS dbwrap_delete_bystring(struct db_context *db, const char *key)
 169 {
 170         struct db_record *rec;
 171         NTSTATUS status;
 172
 173         rec = db->fetch_locked(db, talloc_tos(), string_term_tdb_data(key));
 174         if (rec == NULL) {
 175                 return NT_STATUS_NO_MEMORY;
 176         }
 177         status = rec->delete_rec(rec);
 178         TALLOC_FREE(rec);
 179         return status;
 180 }
 181
 182 NTSTATUS dbwrap_store_bystring(struct db_context *db, const char *key,
 183                                TDB_DATA data, int flags)
 184 {
 185         struct db_record *rec;
 186         NTSTATUS status;
 187
 188         rec = db->fetch_locked(db, talloc_tos(), string_term_tdb_data(key));
 189         if (rec == NULL) {
 190                 return NT_STATUS_NO_MEMORY;
 191         }
 192
 193         status = rec->store(rec, data, flags);
 194         TALLOC_FREE(rec);
 195         return status;
 196 }
 197
 198 TDB_DATA dbwrap_fetch_bystring(struct db_context *db, TALLOC_CTX *mem_ctx,
 199                                const char *key)
 200 {
 201         TDB_DATA result;
 202
 203         if (db->fetch(db, mem_ctx, string_term_tdb_data(key), &result) == -1) {
 204                 return make_tdb_data(NULL, 0);
 205         }
 206
 207         return result;
 208 }