diff options
Diffstat (limited to 'source4/dsdb/repl/drepl_ridalloc.c')
| -rw-r--r-- | source4/dsdb/repl/drepl_ridalloc.c | 254 |
1 files changed, 254 insertions, 0 deletions
diff --git a/source4/dsdb/repl/drepl_ridalloc.c b/source4/dsdb/repl/drepl_ridalloc.c new file mode 100644 index 0000000000..34f75862da --- /dev/null +++ b/source4/dsdb/repl/drepl_ridalloc.c @@ -0,0 +1,254 @@ +/* + 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; +} |