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/*
Unix SMB/CIFS implementation.
Copyright (C) Stefan Metzmacher 2012
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 "system/filesys.h"
#include "smbd/globals.h"
#include "dbwrap/dbwrap.h"
#include "dbwrap/dbwrap_open.h"
#include "lib/util/util_tdb.h"
#include "librpc/gen_ndr/ndr_smbXsrv.h"
#include "serverid.h"
/*
* This implements a version scheme for file server internal
* states. smbXsrv_version_global.tdb stores the possible
* and current versions of structure formats (struct smbXsrv_*_global)
* per cluster node.
*
* If the supported versions doesn't match a version of any
* of the other nodes, it refused to start.
*
* This should prevent silent corruption of the internal
* databases and structures, if two incompatible implementations
* read and write.
*
* In future this can be used to implement rolling code upgrades
* in a cluster, but for now it is simple.
*/
static struct db_context *smbXsrv_version_global_db_ctx = NULL;
static uint32_t smbXsrv_version_global_current_version = UINT32_MAX;
NTSTATUS smbXsrv_version_global_init(const struct server_id *server_id)
{
const char *global_path = NULL;
struct db_context *db_ctx = NULL;
struct db_record *db_rec = NULL;
TDB_DATA key;
TDB_DATA val;
DATA_BLOB blob;
struct smbXsrv_version_globalB global_blob;
enum ndr_err_code ndr_err;
struct smbXsrv_version_global0 *global = NULL;
uint32_t i;
uint32_t num_valid = 0;
struct smbXsrv_version_node0 *valid = NULL;
struct smbXsrv_version_node0 *local_node = NULL;
bool exists;
NTSTATUS status;
const char *key_string = "smbXsrv_version_global";
TALLOC_CTX *frame;
if (smbXsrv_version_global_db_ctx != NULL) {
return NT_STATUS_OK;
}
frame = talloc_stackframe();
global_path = lock_path(talloc_tos(), "smbXsrv_version_global.tdb");
if (global_path == NULL) {
TALLOC_FREE(frame);
return NT_STATUS_NO_MEMORY;
}
db_ctx = db_open(NULL, global_path,
0, /* hash_size */
TDB_DEFAULT |
TDB_CLEAR_IF_FIRST |
TDB_INCOMPATIBLE_HASH,
O_RDWR | O_CREAT, 0600,
DBWRAP_LOCK_ORDER_1,
DBWRAP_FLAG_NONE);
if (db_ctx == NULL) {
status = map_nt_error_from_unix_common(errno);
DEBUG(0,("smbXsrv_version_global_init: "
"failed to open[%s] - %s\n",
global_path, nt_errstr(status)));
TALLOC_FREE(frame);
return status;
}
key = string_term_tdb_data(key_string);
db_rec = dbwrap_fetch_locked(db_ctx, db_ctx, key);
if (db_rec == NULL) {
status = NT_STATUS_INTERNAL_DB_ERROR;
DEBUG(0,("smbXsrv_version_global_init: "
"dbwrap_fetch_locked(%s) - %s\n",
key_string, nt_errstr(status)));
TALLOC_FREE(frame);
return status;
}
val = dbwrap_record_get_value(db_rec);
if (val.dsize == 0) {
global = talloc_zero(frame, struct smbXsrv_version_global0);
if (global == NULL) {
DEBUG(0,("smbXsrv_version_global_init: "
"talloc_zero failed - %s\n", __location__));
TALLOC_FREE(frame);
return NT_STATUS_NO_MEMORY;
}
ZERO_STRUCT(global_blob);
global_blob.version = SMBXSRV_VERSION_CURRENT;
global_blob.info.info0 = global;
} else {
blob = data_blob_const(val.dptr, val.dsize);
ndr_err = ndr_pull_struct_blob(&blob, frame, &global_blob,
(ndr_pull_flags_fn_t)ndr_pull_smbXsrv_version_globalB);
if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
status = ndr_map_error2ntstatus(ndr_err);
DEBUG(0,("smbXsrv_version_global_init: "
"ndr_pull_smbXsrv_version_globalB - %s\n",
nt_errstr(status)));
TALLOC_FREE(frame);
return status;
}
switch (global_blob.version) {
case SMBXSRV_VERSION_0:
global = global_blob.info.info0;
if (global == NULL) {
status = NT_STATUS_INTERNAL_DB_CORRUPTION;
break;
}
status = NT_STATUS_OK;
break;
default:
status = NT_STATUS_REVISION_MISMATCH;
break;
}
if (!NT_STATUS_IS_OK(status)) {
DEBUG(0,("smbXsrv_version_global_init - %s\n",
nt_errstr(status)));
NDR_PRINT_DEBUG(smbXsrv_version_globalB, &global_blob);
TALLOC_FREE(frame);
return status;
}
}
valid = talloc_zero_array(global,
struct smbXsrv_version_node0,
global->num_nodes + 1);
if (valid == NULL) {
DEBUG(0,("smbXsrv_version_global_init: "
"talloc_zero_array failed - %s\n", __location__));
TALLOC_FREE(frame);
return NT_STATUS_NO_MEMORY;
}
num_valid = 0;
for (i=0; i < global->num_nodes; i++) {
struct smbXsrv_version_node0 *n = &global->nodes[i];
exists = serverid_exists(&n->server_id);
if (!exists) {
continue;
}
if (n->min_version > n->max_version) {
status = NT_STATUS_INTERNAL_DB_CORRUPTION;
DEBUG(0,("smbXsrv_version_global_init - %s\n",
nt_errstr(status)));
NDR_PRINT_DEBUG(smbXsrv_version_globalB, &global_blob);
TALLOC_FREE(frame);
return status;
}
if (n->min_version > global_blob.version) {
status = NT_STATUS_INTERNAL_DB_CORRUPTION;
DEBUG(0,("smbXsrv_version_global_init - %s\n",
nt_errstr(status)));
NDR_PRINT_DEBUG(smbXsrv_version_globalB, &global_blob);
TALLOC_FREE(frame);
return status;
}
if (n->max_version < global_blob.version) {
status = NT_STATUS_INTERNAL_DB_CORRUPTION;
DEBUG(0,("smbXsrv_version_global_init - %s\n",
nt_errstr(status)));
NDR_PRINT_DEBUG(smbXsrv_version_globalB, &global_blob);
TALLOC_FREE(frame);
return status;
}
valid[num_valid] = *n;
if (server_id->vnn == n->server_id.vnn) {
local_node = &valid[num_valid];
}
num_valid++;
}
if (local_node == NULL) {
local_node = &valid[num_valid];
num_valid++;
}
local_node->server_id = *server_id;
local_node->min_version = SMBXSRV_VERSION_0;
local_node->max_version = SMBXSRV_VERSION_CURRENT;
local_node->current_version = global_blob.version;
global->num_nodes = num_valid;
global->nodes = valid;
global_blob.seqnum += 1;
global_blob.info.info0 = global;
ndr_err = ndr_push_struct_blob(&blob, db_rec, &global_blob,
(ndr_push_flags_fn_t)ndr_push_smbXsrv_version_globalB);
if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
status = ndr_map_error2ntstatus(ndr_err);
DEBUG(0,("smbXsrv_version_global_init: "
"ndr_push_smbXsrv_version_globalB - %s\n",
nt_errstr(status)));
TALLOC_FREE(frame);
return status;
}
val = make_tdb_data(blob.data, blob.length);
status = dbwrap_record_store(db_rec, val, TDB_REPLACE);
TALLOC_FREE(db_rec);
if (!NT_STATUS_IS_OK(status)) {
DEBUG(0,("smbXsrv_version_global_init: "
"dbwrap_record_store - %s\n",
nt_errstr(status)));
TALLOC_FREE(frame);
return status;
}
DEBUG(10,("smbXsrv_version_global_init\n"));
if (DEBUGLVL(10)) {
NDR_PRINT_DEBUG(smbXsrv_version_globalB, &global_blob);
}
smbXsrv_version_global_db_ctx = db_ctx;
smbXsrv_version_global_current_version = global_blob.version;
TALLOC_FREE(frame);
return NT_STATUS_OK;
}
uint32_t smbXsrv_version_global_current(void)
{
return smbXsrv_version_global_current_version;
}
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