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  * 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         /* TODO: implement this differently */
 108         return db_open(mem_ctx, name, hash_size, tdb_flags, open_flags, mode);
 109 }
 110
 111 NTSTATUS dbwrap_delete_bystring(struct db_context *db, const char *key)
 112 {
 113         struct db_record *rec;
 114         NTSTATUS status;
 115
 116         rec = db->fetch_locked(db, talloc_tos(), string_term_tdb_data(key));
 117         if (rec == NULL) {
 118                 return NT_STATUS_NO_MEMORY;
 119         }
 120         status = rec->delete_rec(rec);
 121         TALLOC_FREE(rec);
 122         return status;
 123 }
 124
 125 NTSTATUS dbwrap_store_bystring(struct db_context *db, const char *key,
 126                                TDB_DATA data, int flags)
 127 {
 128         struct db_record *rec;
 129         NTSTATUS status;
 130
 131         rec = db->fetch_locked(db, talloc_tos(), string_term_tdb_data(key));
 132         if (rec == NULL) {
 133                 return NT_STATUS_NO_MEMORY;
 134         }
 135
 136         status = rec->store(rec, data, flags);
 137         TALLOC_FREE(rec);
 138         return status;
 139 }
 140
 141 TDB_DATA dbwrap_fetch_bystring(struct db_context *db, TALLOC_CTX *mem_ctx,
 142                                const char *key)
 143 {
 144         TDB_DATA result;
 145
 146         if (db->fetch(db, mem_ctx, string_term_tdb_data(key), &result) == -1) {
 147                 return make_tdb_data(NULL, 0);
 148         }
 149
 150         return result;
 151 }