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 bool db_is_local(const char *name)
  46 {
  47 #ifdef CLUSTER_SUPPORT
  48         const char *sockname = lp_ctdbd_socket();
  49
  50         if(!sockname || !*sockname) {
  51                 sockname = CTDB_PATH;
  52         }
  53
  54         if (lp_clustering() && socket_exist(sockname)) {
  55                 const char *partname;
  56                 /* ctdb only wants the file part of the name */
  57                 partname = strrchr(name, '/');
  58                 if (partname) {
  59                         partname++;
  60                 } else {
  61                         partname = name;
  62                 }
  63                 /* allow ctdb for individual databases to be disabled */
  64                 if (lp_parm_bool(-1, "ctdb", partname, True)) {
  65                         return false;
  66                 }
  67         }
  68 #endif
  69         return true;
  70 }
  71
  72 /**
  73  * If you need transaction support use db_open_trans()
  74  */
  75 struct db_context *db_open(TALLOC_CTX *mem_ctx,
  76                            const char *name,
  77                            int hash_size, int tdb_flags,
  78                            int open_flags, mode_t mode)
  79 {
  80         struct db_context *result = NULL;
  81 #ifdef CLUSTER_SUPPORT
  82         const char *sockname = lp_ctdbd_socket();
  83 #endif
  84
  85 #ifdef CLUSTER_SUPPORT
  86         if(!sockname || !*sockname) {
  87                 sockname = CTDB_PATH;
  88         }
  89
  90         if (lp_clustering() && socket_exist(sockname)) {
  91                 const char *partname;
  92                 /* ctdb only wants the file part of the name */
  93                 partname = strrchr(name, '/');
  94                 if (partname) {
  95                         partname++;
  96                 } else {
  97                         partname = name;
  98                 }
  99                 /* allow ctdb for individual databases to be disabled */
 100                 if (lp_parm_bool(-1, "ctdb", partname, True)) {
 101                         result = db_open_ctdb(mem_ctx, partname, hash_size,
 102                                               tdb_flags, open_flags, mode);
 103                         if (result == NULL) {
 104                                 DEBUG(0,("failed to attach to ctdb %s\n",
 105                                          partname));
 106                                 smb_panic("failed to attach to a ctdb "
 107                                           "database");
 108                         }
 109                 }
 110         }
 111
 112 #endif
 113
 114         if (result == NULL) {
 115                 result = db_open_tdb(mem_ctx, name, hash_size,
 116                                      tdb_flags, open_flags, mode);
 117         }
 118
 119         if ((result != NULL) && (result->fetch == NULL)) {
 120                 result->fetch = dbwrap_fallback_fetch;
 121         }
 122
 123         return result;
 124 }
 125
 126 /**
 127  * If you use this you can only modify with a transaction
 128  */
 129 struct db_context *db_open_trans(TALLOC_CTX *mem_ctx,
 130                                  const char *name,
 131                                  int hash_size, int tdb_flags,
 132                                  int open_flags, mode_t mode)
 133 {
 134         bool use_tdb2 = lp_parm_bool(-1, "dbwrap", "use_tdb2", false);
 135 #ifdef CLUSTER_SUPPORT
 136         const char *sockname = lp_ctdbd_socket();
 137 #endif
 138
 139         if (tdb_flags & TDB_CLEAR_IF_FIRST) {
 140                 DEBUG(0,("db_open_trans: called with TDB_CLEAR_IF_FIRST: %s\n",
 141                          name));
 142                 smb_panic("db_open_trans: called with TDB_CLEAR_IF_FIRST");
 143         }
 144
 145 #ifdef CLUSTER_SUPPORT
 146         if(!sockname || !*sockname) {
 147                 sockname = CTDB_PATH;
 148         }
 149
 150         if (lp_clustering() && socket_exist(sockname)) {
 151                 const char *partname;
 152                 /* ctdb only wants the file part of the name */
 153                 partname = strrchr(name, '/');
 154                 if (partname) {
 155                         partname++;
 156                 } else {
 157                         partname = name;
 158                 }
 159                 /* allow ctdb for individual databases to be disabled */
 160                 if (lp_parm_bool(-1, "ctdb", partname, true)) {
 161                         struct db_context *result = NULL;
 162                         result = db_open_ctdb(mem_ctx, partname, hash_size,
 163                                               tdb_flags, open_flags, mode);
 164                         if (result == NULL) {
 165                                 DEBUG(0,("failed to attach to ctdb %s\n",
 166                                          partname));
 167                                 smb_panic("failed to attach to a ctdb "
 168                                           "database");
 169                         }
 170                         return result;
 171                 }
 172         }
 173 #endif
 174
 175         if (use_tdb2) {
 176                 const char *partname;
 177                 /* tdb2 only wants the file part of the name */
 178                 partname = strrchr(name, '/');
 179                 if (partname) {
 180                         partname++;
 181                 } else {
 182                         partname = name;
 183                 }
 184                 /* allow ctdb for individual databases to be disabled */
 185                 if (lp_parm_bool(-1, "tdb2", partname, true)) {
 186                         return db_open_tdb2(mem_ctx, partname, hash_size,
 187                                             tdb_flags, open_flags, mode);
 188                 }
 189         }
 190
 191         return db_open_tdb(mem_ctx, name, hash_size,
 192                            tdb_flags, open_flags, mode);
 193 }
 194
 195 NTSTATUS dbwrap_delete_bystring(struct db_context *db, const char *key)
 196 {
 197         struct db_record *rec;
 198         NTSTATUS status;
 199
 200         rec = db->fetch_locked(db, talloc_tos(), string_term_tdb_data(key));
 201         if (rec == NULL) {
 202                 return NT_STATUS_NO_MEMORY;
 203         }
 204         status = rec->delete_rec(rec);
 205         TALLOC_FREE(rec);
 206         return status;
 207 }
 208
 209 NTSTATUS dbwrap_store_bystring(struct db_context *db, const char *key,
 210                                TDB_DATA data, int flags)
 211 {
 212         struct db_record *rec;
 213         NTSTATUS status;
 214
 215         rec = db->fetch_locked(db, talloc_tos(), string_term_tdb_data(key));
 216         if (rec == NULL) {
 217                 return NT_STATUS_NO_MEMORY;
 218         }
 219
 220         status = rec->store(rec, data, flags);
 221         TALLOC_FREE(rec);
 222         return status;
 223 }
 224
 225 TDB_DATA dbwrap_fetch_bystring(struct db_context *db, TALLOC_CTX *mem_ctx,
 226                                const char *key)
 227 {
 228         TDB_DATA result;
 229
 230         if (db->fetch(db, mem_ctx, string_term_tdb_data(key), &result) == -1) {
 231                 return make_tdb_data(NULL, 0);
 232         }
 233
 234         return result;
 235 }