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/*
Unix SMB/CIFS implementation.
Database interface wrapper
Copyright (C) Jim McDonough <jmcd@us.ibm.com> 2006
Major code contributions from Aleksey Fedoseev (fedoseev@ru.ibm.com)
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "includes.h"
#include "dbwrap.h"
#include "util_tdb.h"
#ifdef CLUSTER_SUPPORT
#include "ctdb_private.h"
#endif
/*
* Fall back using fetch_locked if no genuine fetch operation is provided
*/
static int dbwrap_fallback_fetch(struct db_context *db, TALLOC_CTX *mem_ctx,
TDB_DATA key, TDB_DATA *data)
{
struct db_record *rec;
if (!(rec = db->fetch_locked(db, mem_ctx, key))) {
return -1;
}
data->dsize = rec->value.dsize;
data->dptr = talloc_move(mem_ctx, &rec->value.dptr);
TALLOC_FREE(rec);
return 0;
}
/*
* Fall back using fetch if no genuine parse operation is provided
*/
static int dbwrap_fallback_parse_record(struct db_context *db, TDB_DATA key,
int (*parser)(TDB_DATA key,
TDB_DATA data,
void *private_data),
void *private_data)
{
TDB_DATA data;
int res;
res = db->fetch(db, talloc_tos(), key, &data);
if (res != 0) {
return res;
}
res = parser(key, data, private_data);
TALLOC_FREE(data.dptr);
return res;
}
bool db_is_local(const char *name)
{
#ifdef CLUSTER_SUPPORT
const char *sockname = lp_ctdbd_socket();
if(!sockname || !*sockname) {
sockname = CTDB_PATH;
}
if (lp_clustering() && socket_exist(sockname)) {
const char *partname;
/* ctdb only wants the file part of the name */
partname = strrchr(name, '/');
if (partname) {
partname++;
} else {
partname = name;
}
/* allow ctdb for individual databases to be disabled */
if (lp_parm_bool(-1, "ctdb", partname, True)) {
return false;
}
}
#endif
return true;
}
/**
* open a database
*/
struct db_context *db_open(TALLOC_CTX *mem_ctx,
const char *name,
int hash_size, int tdb_flags,
int open_flags, mode_t mode)
{
struct db_context *result = NULL;
#ifdef CLUSTER_SUPPORT
const char *sockname = lp_ctdbd_socket();
if(!sockname || !*sockname) {
sockname = CTDB_PATH;
}
if (lp_clustering()) {
const char *partname;
if (!socket_exist(sockname)) {
DEBUG(1, ("ctdb socket does not exist - is ctdb not "
"running?\n"));
return NULL;
}
/* ctdb only wants the file part of the name */
partname = strrchr(name, '/');
if (partname) {
partname++;
} else {
partname = name;
}
/* allow ctdb for individual databases to be disabled */
if (lp_parm_bool(-1, "ctdb", partname, True)) {
result = db_open_ctdb(mem_ctx, partname, hash_size,
tdb_flags, open_flags, mode);
if (result == NULL) {
DEBUG(0,("failed to attach to ctdb %s\n",
partname));
if (errno == 0) {
errno = EIO;
}
return NULL;
}
}
}
#endif
if (result == NULL) {
result = db_open_tdb(mem_ctx, name, hash_size,
tdb_flags, open_flags, mode);
}
if ((result != NULL) && (result->fetch == NULL)) {
result->fetch = dbwrap_fallback_fetch;
}
if ((result != NULL) && (result->parse_record == NULL)) {
result->parse_record = dbwrap_fallback_parse_record;
}
return result;
}
NTSTATUS dbwrap_delete(struct db_context *db, TDB_DATA key)
{
struct db_record *rec;
NTSTATUS status;
rec = db->fetch_locked(db, talloc_tos(), key);
if (rec == NULL) {
return NT_STATUS_NO_MEMORY;
}
status = rec->delete_rec(rec);
TALLOC_FREE(rec);
return status;
}
NTSTATUS dbwrap_store(struct db_context *db, TDB_DATA key,
TDB_DATA data, int flags)
{
struct db_record *rec;
NTSTATUS status;
rec = db->fetch_locked(db, talloc_tos(), key);
if (rec == NULL) {
return NT_STATUS_NO_MEMORY;
}
status = rec->store(rec, data, flags);
TALLOC_FREE(rec);
return status;
}
TDB_DATA dbwrap_fetch(struct db_context *db, TALLOC_CTX *mem_ctx,
TDB_DATA key)
{
TDB_DATA result;
if (db->fetch(db, mem_ctx, key, &result) == -1) {
return make_tdb_data(NULL, 0);
}
return result;
}
NTSTATUS dbwrap_delete_bystring(struct db_context *db, const char *key)
{
return dbwrap_delete(db, string_term_tdb_data(key));
}
NTSTATUS dbwrap_store_bystring(struct db_context *db, const char *key,
TDB_DATA data, int flags)
{
return dbwrap_store(db, string_term_tdb_data(key), data, flags);
}
TDB_DATA dbwrap_fetch_bystring(struct db_context *db, TALLOC_CTX *mem_ctx,
const char *key)
{
return dbwrap_fetch(db, mem_ctx, string_term_tdb_data(key));
}
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