2 Unix SMB/CIFS mplementation.
4 DSDB replication service - RID allocation code
6 Copyright (C) Andrew Tridgell 2010
7 Copyright (C) Andrew Bartlett 2010
9 based on drepl_notify.c
11 This program is free software; you can redistribute it and/or modify
12 it under the terms of the GNU General Public License as published by
13 the Free Software Foundation; either version 3 of the License, or
14 (at your option) any later version.
16 This program is distributed in the hope that it will be useful,
17 but WITHOUT ANY WARRANTY; without even the implied warranty of
18 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 GNU General Public License for more details.
21 You should have received a copy of the GNU General Public License
22 along with this program. If not, see <http://www.gnu.org/licenses/>.
27 #include "ldb_module.h"
28 #include "dsdb/samdb/samdb.h"
29 #include "smbd/service.h"
30 #include "dsdb/repl/drepl_service.h"
31 #include "param/param.h"
34 called when a rid allocation request has completed
36 static void drepl_new_rid_pool_callback(struct dreplsrv_service *service,
38 enum drsuapi_DsExtendedError ext_err,
41 if (!W_ERROR_IS_OK(werr)) {
42 DEBUG(0,(__location__ ": RID Manager failed RID allocation - %s - extended_ret[0x%X]\n",
43 win_errstr(werr), ext_err));
45 DEBUG(3,(__location__ ": RID Manager completed RID allocation OK\n"));
48 service->rid_alloc_in_progress = false;
52 schedule a getncchanges request to the RID Manager to ask for a new
53 set of RIDs using DRSUAPI_EXOP_FSMO_RID_ALLOC
55 static WERROR drepl_request_new_rid_pool(struct dreplsrv_service *service,
56 struct ldb_dn *rid_manager_dn, struct ldb_dn *fsmo_role_dn,
59 WERROR werr = drepl_request_extended_op(service,
62 DRSUAPI_EXOP_FSMO_RID_ALLOC,
65 drepl_new_rid_pool_callback, NULL);
66 if (W_ERROR_IS_OK(werr)) {
67 service->rid_alloc_in_progress = true;
74 see if we are on the last pool we have
76 static int drepl_ridalloc_pool_exhausted(struct ldb_context *ldb,
78 uint64_t *_alloc_pool)
80 struct ldb_dn *server_dn, *machine_dn, *rid_set_dn;
81 TALLOC_CTX *tmp_ctx = talloc_new(ldb);
84 uint32_t prev_pool_lo, prev_pool_hi;
86 static const char * const attrs[] = {
88 "rIDPreviousAllocationPool",
93 struct ldb_result *res;
96 *_alloc_pool = UINT64_MAX;
98 server_dn = ldb_dn_get_parent(tmp_ctx, samdb_ntds_settings_dn(ldb));
100 talloc_free(tmp_ctx);
101 return ldb_operr(ldb);
104 ret = samdb_reference_dn(ldb, tmp_ctx, server_dn, "serverReference", &machine_dn);
105 if (ret != LDB_SUCCESS) {
106 DEBUG(0,(__location__ ": Failed to find serverReference in %s - %s",
107 ldb_dn_get_linearized(server_dn), ldb_errstring(ldb)));
108 talloc_free(tmp_ctx);
112 ret = samdb_reference_dn(ldb, tmp_ctx, machine_dn, "rIDSetReferences", &rid_set_dn);
113 if (ret == LDB_ERR_NO_SUCH_ATTRIBUTE) {
116 talloc_free(tmp_ctx);
119 if (ret != LDB_SUCCESS) {
120 DEBUG(0,(__location__ ": Failed to find rIDSetReferences in %s - %s",
121 ldb_dn_get_linearized(machine_dn), ldb_errstring(ldb)));
122 talloc_free(tmp_ctx);
126 ret = ldb_search(ldb, tmp_ctx, &res, rid_set_dn, LDB_SCOPE_BASE, attrs, NULL);
127 if (ret != LDB_SUCCESS) {
128 DEBUG(0,(__location__ ": Failed to load RID Set attrs from %s - %s",
129 ldb_dn_get_linearized(rid_set_dn), ldb_errstring(ldb)));
130 talloc_free(tmp_ctx);
134 alloc_pool = ldb_msg_find_attr_as_uint64(res->msgs[0], "rIDAllocationPool", 0);
135 prev_pool = ldb_msg_find_attr_as_uint64(res->msgs[0], "rIDPreviousAllocationPool", 0);
136 prev_pool_lo = prev_pool & 0xFFFFFFFF;
137 prev_pool_hi = prev_pool >> 32;
138 next_rid = ldb_msg_find_attr_as_uint(res->msgs[0], "rIDNextRid", 0);
140 if (alloc_pool != prev_pool) {
141 talloc_free(tmp_ctx);
145 if (next_rid < (prev_pool_hi + prev_pool_lo)/2) {
146 talloc_free(tmp_ctx);
151 *_alloc_pool = alloc_pool;
152 talloc_free(tmp_ctx);
158 see if we are low on RIDs in the RID Set rIDAllocationPool. If we
159 are, then schedule a replication call with DRSUAPI_EXOP_FSMO_RID_ALLOC
162 WERROR dreplsrv_ridalloc_check_rid_pool(struct dreplsrv_service *service)
164 struct ldb_dn *rid_manager_dn, *fsmo_role_dn;
165 TALLOC_CTX *tmp_ctx = talloc_new(service);
166 struct ldb_context *ldb = service->samdb;
172 if (service->rid_alloc_in_progress) {
173 talloc_free(tmp_ctx);
179 - find who the RID Manager is
180 - if we are the RID Manager then nothing to do
181 - find our RID Set object
182 - load rIDAllocationPool and rIDPreviousAllocationPool
183 - if rIDAllocationPool != rIDPreviousAllocationPool then
185 - schedule a getncchanges with DRSUAPI_EXOP_FSMO_RID_ALLOC
189 /* work out who is the RID Manager */
190 ret = samdb_rid_manager_dn(ldb, tmp_ctx, &rid_manager_dn);
191 if (ret != LDB_SUCCESS) {
192 DEBUG(0, (__location__ ": Failed to find RID Manager object - %s", ldb_errstring(ldb)));
193 talloc_free(tmp_ctx);
194 return WERR_DS_DRA_INTERNAL_ERROR;
197 /* find the DN of the RID Manager */
198 ret = samdb_reference_dn(ldb, tmp_ctx, rid_manager_dn, "fSMORoleOwner", &fsmo_role_dn);
199 if (ret != LDB_SUCCESS) {
200 DEBUG(0,(__location__ ": Failed to find fSMORoleOwner in RID Manager object - %s",
201 ldb_errstring(ldb)));
202 talloc_free(tmp_ctx);
203 return WERR_DS_DRA_INTERNAL_ERROR;
206 if (ldb_dn_compare(samdb_ntds_settings_dn(ldb), fsmo_role_dn) == 0) {
207 /* we are the RID Manager - no need to do a
208 DRSUAPI_EXOP_FSMO_RID_ALLOC */
209 talloc_free(tmp_ctx);
213 ret = drepl_ridalloc_pool_exhausted(ldb, &exhausted, &alloc_pool);
214 if (ret != LDB_SUCCESS) {
215 talloc_free(tmp_ctx);
216 return WERR_DS_DRA_INTERNAL_ERROR;
220 /* don't need a new pool */
221 talloc_free(tmp_ctx);
225 DEBUG(2,(__location__ ": Requesting more RIDs from RID Manager\n"));
227 werr = drepl_request_new_rid_pool(service, rid_manager_dn, fsmo_role_dn, alloc_pool);
228 talloc_free(tmp_ctx);
232 /* called by the samldb ldb module to tell us to ask for a new RID
234 void dreplsrv_allocate_rid(struct messaging_context *msg, void *private_data,
236 struct server_id server_id, DATA_BLOB *data)
238 struct dreplsrv_service *service = talloc_get_type(private_data, struct dreplsrv_service);
239 dreplsrv_ridalloc_check_rid_pool(service);