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/*
Unix SMB/CIFS mplementation.
DSDB replication service - RID allocation code
Copyright (C) Andrew Tridgell 2010
Copyright (C) Andrew Bartlett 2010
based on drepl_notify.c
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 "ldb_module.h"
#include "dsdb/samdb/samdb.h"
#include "smbd/service.h"
#include "dsdb/repl/drepl_service.h"
#include "param/param.h"
/*
called when a rid allocation request has completed
*/
static void drepl_new_rid_pool_callback(struct dreplsrv_service *service,
WERROR werr,
enum drsuapi_DsExtendedError ext_err,
void *cb_data)
{
if (!W_ERROR_IS_OK(werr)) {
DEBUG(0,(__location__ ": RID Manager failed RID allocation - %s - extended_ret[0x%X]\n",
win_errstr(werr), ext_err));
} else {
DEBUG(3,(__location__ ": RID Manager completed RID allocation OK\n"));
}
service->rid_alloc_in_progress = false;
}
/*
schedule a getncchanges request to the RID Manager to ask for a new
set of RIDs using DRSUAPI_EXOP_FSMO_RID_ALLOC
*/
static WERROR drepl_request_new_rid_pool(struct dreplsrv_service *service,
struct ldb_dn *rid_manager_dn, struct ldb_dn *fsmo_role_dn,
uint64_t alloc_pool)
{
WERROR werr = drepl_request_extended_op(service,
rid_manager_dn,
fsmo_role_dn,
DRSUAPI_EXOP_FSMO_RID_ALLOC,
alloc_pool,
drepl_new_rid_pool_callback, NULL);
if (W_ERROR_IS_OK(werr)) {
service->rid_alloc_in_progress = true;
}
return werr;
}
/*
see if we are on the last pool we have
*/
static int drepl_ridalloc_pool_exhausted(struct ldb_context *ldb,
bool *exhausted,
uint64_t *_alloc_pool)
{
struct ldb_dn *server_dn, *machine_dn, *rid_set_dn;
TALLOC_CTX *tmp_ctx = talloc_new(ldb);
uint64_t alloc_pool;
uint64_t prev_pool;
uint32_t prev_pool_lo, prev_pool_hi;
uint32_t next_rid;
static const char * const attrs[] = {
"rIDAllocationPool",
"rIDPreviousAllocationPool",
"rIDNextRid",
NULL
};
int ret;
struct ldb_result *res;
*exhausted = false;
*_alloc_pool = UINT64_MAX;
server_dn = ldb_dn_get_parent(tmp_ctx, samdb_ntds_settings_dn(ldb));
if (!server_dn) {
talloc_free(tmp_ctx);
return ldb_operr(ldb);
}
ret = samdb_reference_dn(ldb, tmp_ctx, server_dn, "serverReference", &machine_dn);
if (ret != LDB_SUCCESS) {
DEBUG(0,(__location__ ": Failed to find serverReference in %s - %s",
ldb_dn_get_linearized(server_dn), ldb_errstring(ldb)));
talloc_free(tmp_ctx);
return ret;
}
ret = samdb_reference_dn(ldb, tmp_ctx, machine_dn, "rIDSetReferences", &rid_set_dn);
if (ret == LDB_ERR_NO_SUCH_ATTRIBUTE) {
*exhausted = true;
*_alloc_pool = 0;
talloc_free(tmp_ctx);
return LDB_SUCCESS;
}
if (ret != LDB_SUCCESS) {
DEBUG(0,(__location__ ": Failed to find rIDSetReferences in %s - %s",
ldb_dn_get_linearized(machine_dn), ldb_errstring(ldb)));
talloc_free(tmp_ctx);
return ret;
}
ret = ldb_search(ldb, tmp_ctx, &res, rid_set_dn, LDB_SCOPE_BASE, attrs, NULL);
if (ret != LDB_SUCCESS) {
DEBUG(0,(__location__ ": Failed to load RID Set attrs from %s - %s",
ldb_dn_get_linearized(rid_set_dn), ldb_errstring(ldb)));
talloc_free(tmp_ctx);
return ret;
}
alloc_pool = ldb_msg_find_attr_as_uint64(res->msgs[0], "rIDAllocationPool", 0);
prev_pool = ldb_msg_find_attr_as_uint64(res->msgs[0], "rIDPreviousAllocationPool", 0);
prev_pool_lo = prev_pool & 0xFFFFFFFF;
prev_pool_hi = prev_pool >> 32;
next_rid = ldb_msg_find_attr_as_uint(res->msgs[0], "rIDNextRid", 0);
if (alloc_pool != prev_pool) {
talloc_free(tmp_ctx);
return LDB_SUCCESS;
}
if (next_rid < (prev_pool_hi + prev_pool_lo)/2) {
talloc_free(tmp_ctx);
return LDB_SUCCESS;
}
*exhausted = true;
*_alloc_pool = alloc_pool;
talloc_free(tmp_ctx);
return LDB_SUCCESS;
}
/*
see if we are low on RIDs in the RID Set rIDAllocationPool. If we
are, then schedule a replication call with DRSUAPI_EXOP_FSMO_RID_ALLOC
to the RID Manager
*/
WERROR dreplsrv_ridalloc_check_rid_pool(struct dreplsrv_service *service)
{
struct ldb_dn *rid_manager_dn, *fsmo_role_dn;
TALLOC_CTX *tmp_ctx = talloc_new(service);
struct ldb_context *ldb = service->samdb;
bool exhausted;
WERROR werr;
int ret;
uint64_t alloc_pool;
if (service->rid_alloc_in_progress) {
talloc_free(tmp_ctx);
return WERR_OK;
}
/*
steps:
- find who the RID Manager is
- if we are the RID Manager then nothing to do
- find our RID Set object
- load rIDAllocationPool and rIDPreviousAllocationPool
- if rIDAllocationPool != rIDPreviousAllocationPool then
nothing to do
- schedule a getncchanges with DRSUAPI_EXOP_FSMO_RID_ALLOC
to the RID Manager
*/
/* work out who is the RID Manager */
ret = samdb_rid_manager_dn(ldb, tmp_ctx, &rid_manager_dn);
if (ret != LDB_SUCCESS) {
DEBUG(0, (__location__ ": Failed to find RID Manager object - %s", ldb_errstring(ldb)));
talloc_free(tmp_ctx);
return WERR_DS_DRA_INTERNAL_ERROR;
}
/* find the DN of the RID Manager */
ret = samdb_reference_dn(ldb, tmp_ctx, rid_manager_dn, "fSMORoleOwner", &fsmo_role_dn);
if (ret != LDB_SUCCESS) {
DEBUG(0,(__location__ ": Failed to find fSMORoleOwner in RID Manager object - %s",
ldb_errstring(ldb)));
talloc_free(tmp_ctx);
return WERR_DS_DRA_INTERNAL_ERROR;
}
if (ldb_dn_compare(samdb_ntds_settings_dn(ldb), fsmo_role_dn) == 0) {
/* we are the RID Manager - no need to do a
DRSUAPI_EXOP_FSMO_RID_ALLOC */
talloc_free(tmp_ctx);
return WERR_OK;
}
ret = drepl_ridalloc_pool_exhausted(ldb, &exhausted, &alloc_pool);
if (ret != LDB_SUCCESS) {
talloc_free(tmp_ctx);
return WERR_DS_DRA_INTERNAL_ERROR;
}
if (!exhausted) {
/* don't need a new pool */
talloc_free(tmp_ctx);
return WERR_OK;
}
DEBUG(2,(__location__ ": Requesting more RIDs from RID Manager\n"));
werr = drepl_request_new_rid_pool(service, rid_manager_dn, fsmo_role_dn, alloc_pool);
talloc_free(tmp_ctx);
return werr;
}
/* called by the samldb ldb module to tell us to ask for a new RID
pool */
void dreplsrv_allocate_rid(struct messaging_context *msg, void *private_data,
uint32_t msg_type,
struct server_id server_id, DATA_BLOB *data)
{
struct dreplsrv_service *service = talloc_get_type(private_data, struct dreplsrv_service);
dreplsrv_ridalloc_check_rid_pool(service);
}
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