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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 "dsdb/samdb/samdb.h"
#include "smbd/service.h"
#include "dsdb/repl/drepl_service.h"
#include "param/param.h"
/*
create the RID manager source dsa structure
*/
static WERROR drepl_create_rid_manager_source_dsa(struct dreplsrv_service *service,
struct ldb_dn *rid_manager_dn, struct ldb_dn *fsmo_role_dn)
{
struct dreplsrv_partition_source_dsa *sdsa;
struct ldb_context *ldb = service->samdb;
int ret;
WERROR werr;
sdsa = talloc_zero(service, struct dreplsrv_partition_source_dsa);
W_ERROR_HAVE_NO_MEMORY(sdsa);
sdsa->partition = talloc_zero(sdsa, struct dreplsrv_partition);
if (!sdsa->partition) {
talloc_free(sdsa);
return WERR_NOMEM;
}
sdsa->partition->dn = samdb_base_dn(ldb);
sdsa->partition->nc.dn = ldb_dn_alloc_linearized(sdsa->partition, rid_manager_dn);
ret = dsdb_find_guid_by_dn(ldb, rid_manager_dn, &sdsa->partition->nc.guid);
if (ret != LDB_SUCCESS) {
DEBUG(0,(__location__ ": Failed to find GUID for %s\n",
ldb_dn_get_linearized(rid_manager_dn)));
talloc_free(sdsa);
return WERR_DS_DRA_INTERNAL_ERROR;
}
sdsa->repsFrom1 = &sdsa->_repsFromBlob.ctr.ctr1;
ret = dsdb_find_guid_attr_by_dn(ldb, fsmo_role_dn, "objectGUID", &sdsa->repsFrom1->source_dsa_obj_guid);
if (ret != LDB_SUCCESS) {
DEBUG(0,(__location__ ": Failed to find objectGUID for %s\n",
ldb_dn_get_linearized(fsmo_role_dn)));
talloc_free(sdsa);
return WERR_DS_DRA_INTERNAL_ERROR;
}
sdsa->repsFrom1->other_info = talloc_zero(sdsa, struct repsFromTo1OtherInfo);
if (!sdsa->repsFrom1->other_info) {
talloc_free(sdsa);
return WERR_NOMEM;
}
sdsa->repsFrom1->other_info->dns_name =
talloc_asprintf(sdsa->repsFrom1->other_info, "%s._msdcs.%s",
GUID_string(sdsa->repsFrom1->other_info, &sdsa->repsFrom1->source_dsa_obj_guid),
lp_dnsdomain(service->task->lp_ctx));
if (!sdsa->repsFrom1->other_info->dns_name) {
talloc_free(sdsa);
return WERR_NOMEM;
}
werr = dreplsrv_out_connection_attach(service, sdsa->repsFrom1, &sdsa->conn);
if (!W_ERROR_IS_OK(werr)) {
DEBUG(0,(__location__ ": Failed to attach to RID manager connection\n"));
talloc_free(sdsa);
return werr;
}
service->ridalloc.rid_manager_source_dsa = sdsa;
return WERR_OK;
}
/*
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)
{
WERROR werr;
if (service->ridalloc.rid_manager_source_dsa == NULL) {
/* we need to establish a connection to the RID
Manager */
werr = drepl_create_rid_manager_source_dsa(service, rid_manager_dn, fsmo_role_dn);
W_ERROR_NOT_OK_RETURN(werr);
}
werr = dreplsrv_schedule_partition_pull_source(service, service->ridalloc.rid_manager_source_dsa,
DRSUAPI_EXOP_FSMO_RID_ALLOC);
return werr;
}
/*
see if we are on the last pool we have
*/
static int drepl_ridalloc_pool_exhausted(struct ldb_context *ldb, bool *exhausted)
{
struct ldb_dn *server_dn, *machine_dn, *rid_set_dn;
TALLOC_CTX *tmp_ctx = talloc_new(ldb);
uint64_t alloc_pool, prev_alloc_pool;
const char *attrs[] = { "rIDPreviousAllocationPool", "rIDAllocationPool", NULL };
int ret;
struct ldb_result *res;
server_dn = ldb_dn_get_parent(tmp_ctx, samdb_ntds_settings_dn(ldb));
if (!server_dn) {
talloc_free(tmp_ctx);
return LDB_ERR_OPERATIONS_ERROR;
}
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;
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_alloc_pool = ldb_msg_find_attr_as_uint64(res->msgs[0], "rIDPreviousAllocationPool", 0);
if (alloc_pool != prev_alloc_pool) {
*exhausted = false;
} else {
*exhausted = true;
}
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;
/*
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);
if (ret != LDB_SUCCESS) {
talloc_free(tmp_ctx);
return WERR_DS_DRA_INTERNAL_ERROR;
}
if (!exhausted) {
/* if we're not exhausted we don't need the exop call */
talloc_free(tmp_ctx);
/* we don't need to keep an open connection to the RID
Manager */
talloc_free(service->ridalloc.rid_manager_source_dsa);
service->ridalloc.rid_manager_source_dsa = NULL;
return WERR_OK;
}
werr = drepl_request_new_rid_pool(service, rid_manager_dn, fsmo_role_dn);
talloc_free(tmp_ctx);
return werr;
}
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