source3/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  * Fall back using fetch if no genuine parse operation is provided
  47  */
  48
  49 static int dbwrap_fallback_parse_record(struct db_context *db, TDB_DATA key,
  50                                         int (*parser)(TDB_DATA key,
  51                                                       TDB_DATA data,
  52                                                       void *private_data),
  53                                         void *private_data)
  54 {
  55         TDB_DATA data;
  56         int res;
  57
  58         res = db->fetch(db, talloc_tos(), key, &data);
  59         if (res != 0) {
  60                 return res;
  61         }
  62
  63         res = parser(key, data, private_data);
  64         TALLOC_FREE(data.dptr);
  65         return res;
  66 }
  67
  68 bool db_is_local(const char *name)
  69 {
  70 #ifdef CLUSTER_SUPPORT
  71         const char *sockname = lp_ctdbd_socket();
  72
  73         if(!sockname || !*sockname) {
  74                 sockname = CTDB_PATH;
  75         }
  76
  77         if (lp_clustering() && socket_exist(sockname)) {
  78                 const char *partname;
  79                 /* ctdb only wants the file part of the name */
  80                 partname = strrchr(name, '/');
  81                 if (partname) {
  82                         partname++;
  83                 } else {
  84                         partname = name;
  85                 }
  86                 /* allow ctdb for individual databases to be disabled */
  87                 if (lp_parm_bool(-1, "ctdb", partname, True)) {
  88                         return false;
  89                 }
  90         }
  91 #endif
  92         return true;
  93 }
  94
  95 /**
  96  * open a database
  97  */
  98 struct db_context *db_open(TALLOC_CTX *mem_ctx,
  99                            const char *name,
 100                            int hash_size, int tdb_flags,
 101                            int open_flags, mode_t mode)
 102 {
 103         struct db_context *result = NULL;
 104 #ifdef CLUSTER_SUPPORT
 105         const char *sockname = lp_ctdbd_socket();
 106
 107         if(!sockname || !*sockname) {
 108                 sockname = CTDB_PATH;
 109         }
 110
 111         if (lp_clustering()) {
 112                 const char *partname;
 113
 114                 if (!socket_exist(sockname)) {
 115                         DEBUG(1, ("ctdb socket does not exist - is ctdb not "
 116                                   "running?\n"));
 117                         return NULL;
 118                 }
 119
 120                 /* ctdb only wants the file part of the name */
 121                 partname = strrchr(name, '/');
 122                 if (partname) {
 123                         partname++;
 124                 } else {
 125                         partname = name;
 126                 }
 127                 /* allow ctdb for individual databases to be disabled */
 128                 if (lp_parm_bool(-1, "ctdb", partname, True)) {
 129                         result = db_open_ctdb(mem_ctx, partname, hash_size,
 130                                               tdb_flags, open_flags, mode);
 131                         if (result == NULL) {
 132                                 DEBUG(0,("failed to attach to ctdb %s\n",
 133                                          partname));
 134                                 if (errno == 0) {
 135                                         errno = EIO;
 136                                 }
 137                                 return NULL;
 138                         }
 139                 }
 140         }
 141
 142 #endif
 143
 144         if (result == NULL) {
 145                 result = db_open_tdb(mem_ctx, name, hash_size,
 146                                      tdb_flags, open_flags, mode);
 147         }
 148
 149         if ((result != NULL) && (result->fetch == NULL)) {
 150                 result->fetch = dbwrap_fallback_fetch;
 151         }
 152         if ((result != NULL) && (result->parse_record == NULL)) {
 153                 result->parse_record = dbwrap_fallback_parse_record;
 154         }
 155
 156         return result;
 157 }
 158
 159 NTSTATUS dbwrap_delete(struct db_context *db, TDB_DATA key)
 160 {
 161         struct db_record *rec;
 162         NTSTATUS status;
 163
 164         rec = db->fetch_locked(db, talloc_tos(), key);
 165         if (rec == NULL) {
 166                 return NT_STATUS_NO_MEMORY;
 167         }
 168         status = rec->delete_rec(rec);
 169         TALLOC_FREE(rec);
 170         return status;
 171 }
 172
 173 NTSTATUS dbwrap_store(struct db_context *db, TDB_DATA key,
 174                       TDB_DATA data, int flags)
 175 {
 176         struct db_record *rec;
 177         NTSTATUS status;
 178
 179         rec = db->fetch_locked(db, talloc_tos(), key);
 180         if (rec == NULL) {
 181                 return NT_STATUS_NO_MEMORY;
 182         }
 183
 184         status = rec->store(rec, data, flags);
 185         TALLOC_FREE(rec);
 186         return status;
 187 }
 188
 189 TDB_DATA dbwrap_fetch(struct db_context *db, TALLOC_CTX *mem_ctx,
 190                       TDB_DATA key)
 191 {
 192         TDB_DATA result;
 193
 194         if (db->fetch(db, mem_ctx, key, &result) == -1) {
 195                 return make_tdb_data(NULL, 0);
 196         }
 197
 198         return result;
 199 }
 200
 201 NTSTATUS dbwrap_delete_bystring(struct db_context *db, const char *key)
 202 {
 203         return dbwrap_delete(db, string_term_tdb_data(key));
 204 }
 205
 206 NTSTATUS dbwrap_store_bystring(struct db_context *db, const char *key,
 207                                TDB_DATA data, int flags)
 208 {
 209         return dbwrap_store(db, string_term_tdb_data(key), data, flags);
 210 }
 211
 212 TDB_DATA dbwrap_fetch_bystring(struct db_context *db, TALLOC_CTX *mem_ctx,
 213                                const char *key)
 214 {
 215         return dbwrap_fetch(db, mem_ctx, string_term_tdb_data(key));
 216 }
 217