示例#1
0
static int construct_modifyTimeStamp(struct ldb_module *module,
					struct ldb_message *msg, enum ldb_scope scope,
					struct ldb_request *parent)
{
	struct operational_data *data = talloc_get_type(ldb_module_get_private(module), struct operational_data);
	struct ldb_context *ldb = ldb_module_get_ctx(module);

	/* We may be being called before the init function has finished */
	if (!data) {
		return LDB_SUCCESS;
	}

	/* Try and set this value up, if possible.  Don't worry if it
	 * fails, we may not have the DB set up yet.
	 */
	if (!data->aggregate_dn) {
		data->aggregate_dn = samdb_aggregate_schema_dn(ldb, data);
	}

	if (data->aggregate_dn && ldb_dn_compare(data->aggregate_dn, msg->dn) == 0) {
		/*
		 * If we have the DN for the object with common name = Aggregate and
		 * the request is for this DN then let's do the following:
		 * 1) search the object which changedUSN correspond to the one of the loaded
		 * schema.
		 * 2) Get the whenChanged attribute
		 * 3) Generate the modifyTimestamp out of the whenChanged attribute
		 */
		const struct dsdb_schema *schema = dsdb_get_schema(ldb, NULL);
		char *value = ldb_timestring(msg, schema->ts_last_change);

		return ldb_msg_add_string(msg, "modifyTimeStamp", value);
	}
	return ldb_msg_copy_attr(msg, "whenChanged", "modifyTimeStamp");
}
示例#2
0
static WERROR dsdb_syntax_NTTIME_drsuapi_to_ldb(struct ldb_context *ldb, 
						const struct dsdb_schema *schema,
						const struct dsdb_attribute *attr,
						const struct drsuapi_DsReplicaAttribute *in,
						TALLOC_CTX *mem_ctx,
						struct ldb_message_element *out)
{
	uint32_t i;

	out->flags	= 0;
	out->name	= talloc_strdup(mem_ctx, attr->lDAPDisplayName);
	W_ERROR_HAVE_NO_MEMORY(out->name);

	out->num_values	= in->value_ctr.num_values;
	out->values	= talloc_array(mem_ctx, struct ldb_val, out->num_values);
	W_ERROR_HAVE_NO_MEMORY(out->values);

	for (i=0; i < out->num_values; i++) {
		NTTIME v;
		time_t t;
		char *str;

		if (in->value_ctr.values[i].blob == NULL) {
			return WERR_FOOBAR;
		}

		if (in->value_ctr.values[i].blob->length != 8) {
			return WERR_FOOBAR;
		}

		v = BVAL(in->value_ctr.values[i].blob->data, 0);
		v *= 10000000;
		t = nt_time_to_unix(v);

		str = ldb_timestring(out->values, t); 
		W_ERROR_HAVE_NO_MEMORY(str);

		out->values[i] = data_blob_string_const(str);
	}

	return WERR_OK;
}
static NTSTATUS wreplsrv_scavenging_owned_records(struct wreplsrv_service *service, TALLOC_CTX *tmp_mem)
{
	NTSTATUS status;
	struct winsdb_record *rec = NULL;
	struct ldb_result *res = NULL;
	const char *owner_filter;
	const char *filter;
	uint32_t i;
	int ret;
	time_t now = time(NULL);
	const char *now_timestr;
	const char *action;
	const char *old_state=NULL;
	const char *new_state=NULL;
	uint32_t modify_flags;
	BOOL modify_record;
	BOOL delete_record;
	BOOL delete_tombstones;
	struct timeval tombstone_extra_time;

	now_timestr = ldb_timestring(tmp_mem, now);
	NT_STATUS_HAVE_NO_MEMORY(now_timestr);
	owner_filter = wreplsrv_owner_filter(service, tmp_mem,
					     service->wins_db->local_owner);
	NT_STATUS_HAVE_NO_MEMORY(owner_filter);
	filter = talloc_asprintf(tmp_mem,
				 "(&%s(objectClass=winsRecord)"
				 "(expireTime<=%s))",
				 owner_filter, now_timestr);
	NT_STATUS_HAVE_NO_MEMORY(filter);
	ret = ldb_search(service->wins_db->ldb, NULL, LDB_SCOPE_SUBTREE, filter, NULL, &res);
	if (ret != LDB_SUCCESS) return NT_STATUS_INTERNAL_DB_CORRUPTION;
	talloc_steal(tmp_mem, res);
	DEBUG(10,("WINS scavenging: filter '%s' count %d\n", filter, res->count));

	tombstone_extra_time = timeval_add(&service->startup_time,
					   service->config.tombstone_extra_timeout,
					   0);
	delete_tombstones = timeval_expired(&tombstone_extra_time);

	for (i=0; i < res->count; i++) {
		/*
		 * we pass '0' as 'now' here,
		 * because we want to get the raw timestamps which are in the DB
		 */
		status = winsdb_record(service->wins_db, res->msgs[i], tmp_mem, 0, &rec);
		NT_STATUS_NOT_OK_RETURN(status);
		talloc_free(res->msgs[i]);

		modify_flags	= 0;
		modify_record	= False;
		delete_record	= False;

		switch (rec->state) {
		case WREPL_STATE_ACTIVE:
			old_state	= "active";
			new_state	= "active";
			if (!rec->is_static) {
				new_state	= "released";
				rec->state	= WREPL_STATE_RELEASED;
				rec->expire_time= service->config.tombstone_interval + now;
			}
			modify_flags	= 0;
			modify_record	= True;
			break;

		case WREPL_STATE_RELEASED:
			old_state	= "released";
			new_state	= "tombstone";
			rec->state	= WREPL_STATE_TOMBSTONE;
			rec->expire_time= service->config.tombstone_timeout + now;
			modify_flags	= WINSDB_FLAG_ALLOC_VERSION | WINSDB_FLAG_TAKE_OWNERSHIP;
			modify_record	= True;
			break;

		case WREPL_STATE_TOMBSTONE:
			old_state	= "tombstone";
			new_state	= "tombstone";
			if (!delete_tombstones) break;
			new_state	= "deleted";
			delete_record = True;
			break;

		case WREPL_STATE_RESERVED:
			DEBUG(0,("%s: corrupted record: %s\n",
				__location__, nbt_name_string(rec, rec->name)));
			return NT_STATUS_INTERNAL_DB_CORRUPTION;
		}

		if (modify_record) {
			action = "modify";
			ret = winsdb_modify(service->wins_db, rec, modify_flags);
		} else if (delete_record) {
			action = "delete";
			ret = winsdb_delete(service->wins_db, rec);
		} else {
			action = "skip";
			ret = NBT_RCODE_OK;
		}

		if (ret != NBT_RCODE_OK) {
			DEBUG(1,("WINS scavenging: failed to %s name %s (owned:%s -> owned:%s): error:%u\n",
				action, nbt_name_string(rec, rec->name), old_state, new_state, ret));
		} else {
			DEBUG(4,("WINS scavenging: %s name: %s (owned:%s -> owned:%s)\n",
				action, nbt_name_string(rec, rec->name), old_state, new_state));
		}

		talloc_free(rec);
	}

	return NT_STATUS_OK;
}
示例#4
0
static WERROR dsdb_convert_object_ex(struct ldb_context *ldb,
				     const struct dsdb_schema *schema,
				     const struct drsuapi_DsReplicaObjectListItemEx *in,
				     const DATA_BLOB *gensec_skey,
				     TALLOC_CTX *mem_ctx,
				     struct dsdb_extended_replicated_object *out)
{
	NTSTATUS nt_status;
	WERROR status;
	uint32_t i;
	struct ldb_message *msg;
	struct replPropertyMetaDataBlob *md;
	struct ldb_val guid_value;
	NTTIME whenChanged = 0;
	time_t whenChanged_t;
	const char *whenChanged_s;
	const char *rdn_name = NULL;
	const struct ldb_val *rdn_value = NULL;
	const struct dsdb_attribute *rdn_attr = NULL;
	uint32_t rdn_attid;
	struct drsuapi_DsReplicaAttribute *name_a = NULL;
	struct drsuapi_DsReplicaMetaData *name_d = NULL;
	struct replPropertyMetaData1 *rdn_m = NULL;
	struct dom_sid *sid = NULL;
	uint32_t rid = 0;
	int ret;

	if (!in->object.identifier) {
		return WERR_FOOBAR;
	}

	if (!in->object.identifier->dn || !in->object.identifier->dn[0]) {
		return WERR_FOOBAR;
	}

	if (in->object.attribute_ctr.num_attributes != 0 && !in->meta_data_ctr) {
		return WERR_FOOBAR;
	}

	if (in->object.attribute_ctr.num_attributes != in->meta_data_ctr->count) {
		return WERR_FOOBAR;
	}

	sid = &in->object.identifier->sid;
	if (sid->num_auths > 0) {
		rid = sid->sub_auths[sid->num_auths - 1];
	}

	msg = ldb_msg_new(mem_ctx);
	W_ERROR_HAVE_NO_MEMORY(msg);

	msg->dn			= ldb_dn_new(msg, ldb, in->object.identifier->dn);
	W_ERROR_HAVE_NO_MEMORY(msg->dn);

	rdn_name	= ldb_dn_get_rdn_name(msg->dn);
	rdn_attr	= dsdb_attribute_by_lDAPDisplayName(schema, rdn_name);
	if (!rdn_attr) {
		return WERR_FOOBAR;
	}
	rdn_attid	= rdn_attr->attributeID_id;
	rdn_value	= ldb_dn_get_rdn_val(msg->dn);

	msg->num_elements	= in->object.attribute_ctr.num_attributes;
	msg->elements		= talloc_array(msg, struct ldb_message_element,
					       msg->num_elements);
	W_ERROR_HAVE_NO_MEMORY(msg->elements);

	md = talloc(mem_ctx, struct replPropertyMetaDataBlob);
	W_ERROR_HAVE_NO_MEMORY(md);

	md->version		= 1;
	md->reserved		= 0;
	md->ctr.ctr1.count	= in->meta_data_ctr->count;
	md->ctr.ctr1.reserved	= 0;
	md->ctr.ctr1.array	= talloc_array(mem_ctx,
					       struct replPropertyMetaData1,
					       md->ctr.ctr1.count + 1); /* +1 because of the RDN attribute */
	W_ERROR_HAVE_NO_MEMORY(md->ctr.ctr1.array);

	for (i=0; i < in->meta_data_ctr->count; i++) {
		struct drsuapi_DsReplicaAttribute *a;
		struct drsuapi_DsReplicaMetaData *d;
		struct replPropertyMetaData1 *m;
		struct ldb_message_element *e;
		int j;

		a = &in->object.attribute_ctr.attributes[i];
		d = &in->meta_data_ctr->meta_data[i];
		m = &md->ctr.ctr1.array[i];
		e = &msg->elements[i];

		for (j=0; j<a->value_ctr.num_values; j++) {
			status = drsuapi_decrypt_attribute(a->value_ctr.values[j].blob, gensec_skey, rid, a);
			W_ERROR_NOT_OK_RETURN(status);
		}

		status = dsdb_attribute_drsuapi_to_ldb(ldb, schema, a, msg->elements, e);
		if (!NT_STATUS_IS_OK(status) && a->value_ctr.num_values == 0) {
			/* w2k8-r2 occasionally sends bogus empty
			   attributes with rubbish attribute IDs. The
			   only think we can do is discard these */
			DEBUG(0,(__location__ ": Discarding bogus empty DsReplicaAttribute with attid 0x%x\n",
				 a->attid));
			ZERO_STRUCTP(e);
			continue;
		}
		W_ERROR_NOT_OK_RETURN(status);

		m->attid			= a->attid;
		m->version			= d->version;
		m->originating_change_time	= d->originating_change_time;
		m->originating_invocation_id	= d->originating_invocation_id;
		m->originating_usn		= d->originating_usn;
		m->local_usn			= 0;

		if (d->originating_change_time > whenChanged) {
			whenChanged = d->originating_change_time;
		}

		if (a->attid == DRSUAPI_ATTRIBUTE_name) {
			name_a = a;
			name_d = d;
			rdn_m = &md->ctr.ctr1.array[md->ctr.ctr1.count];
		}
	}

	/* delete any empty elements */
	for (i=0; i < msg->num_elements; i++) {
		if (msg->elements[i].name == NULL) {
			ldb_msg_remove_element(msg, &msg->elements[i]);
			i--;
		}
	}

	if (rdn_m) {
		struct ldb_message_element *el;
		el = ldb_msg_find_element(msg, rdn_attr->lDAPDisplayName);
		if (!el) {
			ret = ldb_msg_add_value(msg, rdn_attr->lDAPDisplayName, rdn_value, NULL);
			if (ret != LDB_SUCCESS) {
				return WERR_FOOBAR;
			}
		} else {
			if (el->num_values != 1) {
				DEBUG(0,(__location__ ": Unexpected num_values=%u\n",
					 el->num_values));
				return WERR_FOOBAR;				
			}
			if (!ldb_val_equal_exact(&el->values[0], rdn_value)) {
				DEBUG(0,(__location__ ": RDN value changed? '%*.*s' '%*.*s'\n",
					 (int)el->values[0].length, (int)el->values[0].length, el->values[0].data,
					 (int)rdn_value->length, (int)rdn_value->length, rdn_value->data));
				return WERR_FOOBAR;				
			}
		}

		rdn_m->attid				= rdn_attid;
		rdn_m->version				= name_d->version;
		rdn_m->originating_change_time		= name_d->originating_change_time;
		rdn_m->originating_invocation_id	= name_d->originating_invocation_id;
		rdn_m->originating_usn			= name_d->originating_usn;
		rdn_m->local_usn			= 0;
		md->ctr.ctr1.count++;

	}

	whenChanged_t = nt_time_to_unix(whenChanged);
	whenChanged_s = ldb_timestring(msg, whenChanged_t);
	W_ERROR_HAVE_NO_MEMORY(whenChanged_s);

	nt_status = GUID_to_ndr_blob(&in->object.identifier->guid, msg, &guid_value);
	if (!NT_STATUS_IS_OK(nt_status)) {
		return ntstatus_to_werror(nt_status);
	}

	out->msg		= msg;
	out->guid_value		= guid_value;
	out->when_changed	= whenChanged_s;
	out->meta_data		= md;
	return WERR_OK;
}
示例#5
0
WERROR dsdb_convert_object_ex(struct ldb_context *ldb,
			      const struct dsdb_schema *schema,
			      const struct dsdb_schema_prefixmap *pfm_remote,
			      const struct drsuapi_DsReplicaObjectListItemEx *in,
			      const DATA_BLOB *gensec_skey,
			      const uint32_t *ignore_attids,
			      uint32_t dsdb_repl_flags,
			      TALLOC_CTX *mem_ctx,
			      struct dsdb_extended_replicated_object *out)
{
	NTSTATUS nt_status;
	WERROR status = WERR_OK;
	uint32_t i;
	struct ldb_message *msg;
	struct replPropertyMetaDataBlob *md;
	int instanceType;
	struct ldb_message_element *instanceType_e = NULL;
	struct ldb_val guid_value;
	struct ldb_val parent_guid_value;
	NTTIME whenChanged = 0;
	time_t whenChanged_t;
	const char *whenChanged_s;
	struct drsuapi_DsReplicaAttribute *name_a = NULL;
	struct drsuapi_DsReplicaMetaData *name_d = NULL;
	struct replPropertyMetaData1 *rdn_m = NULL;
	struct dom_sid *sid = NULL;
	uint32_t rid = 0;
	uint32_t attr_count;
	int ret;

	if (!in->object.identifier) {
		return WERR_FOOBAR;
	}

	if (!in->object.identifier->dn || !in->object.identifier->dn[0]) {
		return WERR_FOOBAR;
	}

	if (in->object.attribute_ctr.num_attributes != 0 && !in->meta_data_ctr) {
		return WERR_FOOBAR;
	}

	if (in->object.attribute_ctr.num_attributes != in->meta_data_ctr->count) {
		return WERR_FOOBAR;
	}

	sid = &in->object.identifier->sid;
	if (sid->num_auths > 0) {
		rid = sid->sub_auths[sid->num_auths - 1];
	}

	msg = ldb_msg_new(mem_ctx);
	W_ERROR_HAVE_NO_MEMORY(msg);

	msg->dn			= ldb_dn_new(msg, ldb, in->object.identifier->dn);
	W_ERROR_HAVE_NO_MEMORY(msg->dn);

	msg->num_elements	= in->object.attribute_ctr.num_attributes;
	msg->elements		= talloc_array(msg, struct ldb_message_element,
					       msg->num_elements + 1); /* +1 because of the RDN attribute */
	W_ERROR_HAVE_NO_MEMORY(msg->elements);

	md = talloc(mem_ctx, struct replPropertyMetaDataBlob);
	W_ERROR_HAVE_NO_MEMORY(md);

	md->version		= 1;
	md->reserved		= 0;
	md->ctr.ctr1.count	= in->meta_data_ctr->count;
	md->ctr.ctr1.reserved	= 0;
	md->ctr.ctr1.array	= talloc_array(mem_ctx,
					       struct replPropertyMetaData1,
					       md->ctr.ctr1.count + 1); /* +1 because of the RDN attribute */
	W_ERROR_HAVE_NO_MEMORY(md->ctr.ctr1.array);

	for (i=0, attr_count=0; i < in->meta_data_ctr->count; i++, attr_count++) {
		struct drsuapi_DsReplicaAttribute *a;
		struct drsuapi_DsReplicaMetaData *d;
		struct replPropertyMetaData1 *m;
		struct ldb_message_element *e;
		uint32_t j;

		a = &in->object.attribute_ctr.attributes[i];
		d = &in->meta_data_ctr->meta_data[i];
		m = &md->ctr.ctr1.array[attr_count];
		e = &msg->elements[attr_count];

		if (dsdb_attid_in_list(ignore_attids, a->attid)) {
			attr_count--;
			continue;
		}

		if (GUID_all_zero(&d->originating_invocation_id)) {
			status = WERR_DS_SRC_GUID_MISMATCH;
			DEBUG(0, ("Refusing replication of object containing invalid zero invocationID on attribute %d of %s: %s\n",
				  a->attid,
				  ldb_dn_get_linearized(msg->dn),
				  win_errstr(status)));
			return status;
		}

		if (a->attid == DRSUAPI_ATTID_instanceType) {
			if (instanceType_e != NULL) {
				return WERR_FOOBAR;
			}
			instanceType_e = e;
		}

		for (j=0; j<a->value_ctr.num_values; j++) {
			status = drsuapi_decrypt_attribute(a->value_ctr.values[j].blob,
							   gensec_skey, rid,
							   dsdb_repl_flags, a);
			if (!W_ERROR_IS_OK(status)) {
				break;
			}
		}
		if (W_ERROR_EQUAL(status, WERR_TOO_MANY_SECRETS)) {
			WERROR get_name_status = dsdb_attribute_drsuapi_to_ldb(ldb, schema, pfm_remote,
									       a, msg->elements, e);
			if (W_ERROR_IS_OK(get_name_status)) {
				DEBUG(0, ("Unxpectedly got secret value %s on %s from DRS server\n",
					  e->name, ldb_dn_get_linearized(msg->dn)));
			} else {
				DEBUG(0, ("Unxpectedly got secret value on %s from DRS server",
					  ldb_dn_get_linearized(msg->dn)));
			}
		} else if (!W_ERROR_IS_OK(status)) {
			return status;
		}

		status = dsdb_attribute_drsuapi_to_ldb(ldb, schema, pfm_remote,
						       a, msg->elements, e);
		W_ERROR_NOT_OK_RETURN(status);

		m->attid			= a->attid;
		m->version			= d->version;
		m->originating_change_time	= d->originating_change_time;
		m->originating_invocation_id	= d->originating_invocation_id;
		m->originating_usn		= d->originating_usn;
		m->local_usn			= 0;

		if (d->originating_change_time > whenChanged) {
			whenChanged = d->originating_change_time;
		}

		if (a->attid == DRSUAPI_ATTID_name) {
			name_a = a;
			name_d = d;
		}
	}

	msg->num_elements = attr_count;
	md->ctr.ctr1.count = attr_count;
	if (name_a) {
		rdn_m = &md->ctr.ctr1.array[md->ctr.ctr1.count];
	}

	if (rdn_m) {
		struct ldb_message_element *el;
		const char *rdn_name = NULL;
		const struct ldb_val *rdn_value = NULL;
		const struct dsdb_attribute *rdn_attr = NULL;
		uint32_t rdn_attid;

		/*
		 * We only need the schema calls for the RDN in this
		 * codepath, and by doing this we avoid needing to
		 * have the dsdb_attribute_by_lDAPDisplayName accessor
		 * working during the schema load.
		 */
		rdn_name	= ldb_dn_get_rdn_name(msg->dn);
		rdn_attr	= dsdb_attribute_by_lDAPDisplayName(schema, rdn_name);
		if (!rdn_attr) {
			return WERR_FOOBAR;
		}
		rdn_attid	= rdn_attr->attributeID_id;
		rdn_value	= ldb_dn_get_rdn_val(msg->dn);

		el = ldb_msg_find_element(msg, rdn_attr->lDAPDisplayName);
		if (!el) {
			ret = ldb_msg_add_value(msg, rdn_attr->lDAPDisplayName, rdn_value, NULL);
			if (ret != LDB_SUCCESS) {
				return WERR_FOOBAR;
			}
		} else {
			if (el->num_values != 1) {
				DEBUG(0,(__location__ ": Unexpected num_values=%u\n",
					 el->num_values));
				return WERR_FOOBAR;				
			}
			if (!ldb_val_equal_exact(&el->values[0], rdn_value)) {
				DEBUG(0,(__location__ ": RDN value changed? '%*.*s' '%*.*s'\n",
					 (int)el->values[0].length, (int)el->values[0].length, el->values[0].data,
					 (int)rdn_value->length, (int)rdn_value->length, rdn_value->data));
				return WERR_FOOBAR;				
			}
		}

		rdn_m->attid				= rdn_attid;
		rdn_m->version				= name_d->version;
		rdn_m->originating_change_time		= name_d->originating_change_time;
		rdn_m->originating_invocation_id	= name_d->originating_invocation_id;
		rdn_m->originating_usn			= name_d->originating_usn;
		rdn_m->local_usn			= 0;
		md->ctr.ctr1.count++;

	}

	if (instanceType_e == NULL) {
		return WERR_FOOBAR;
	}

	instanceType = ldb_msg_find_attr_as_int(msg, "instanceType", 0);
	if (dsdb_repl_flags & DSDB_REPL_FLAG_PARTIAL_REPLICA) {
		/* the instanceType type for partial_replica
		   replication is sent via DRS with TYPE_WRITE set, but
		   must be used on the client with TYPE_WRITE removed
		*/
		if (instanceType & INSTANCE_TYPE_WRITE) {
			/*
			 * Make sure we do not change the order
			 * of msg->elements!
			 *
			 * That's why we use
			 * instanceType_e->num_values = 0
			 * instead of
			 * ldb_msg_remove_attr(msg, "instanceType");
			 */
			struct ldb_message_element *e;

			e = ldb_msg_find_element(msg, "instanceType");
			if (e != instanceType_e) {
				DEBUG(0,("instanceType_e[%p] changed to e[%p]\n",
					 instanceType_e, e));
				return WERR_FOOBAR;
			}

			instanceType_e->num_values = 0;

			instanceType &= ~INSTANCE_TYPE_WRITE;
			if (ldb_msg_add_fmt(msg, "instanceType", "%d", instanceType) != LDB_SUCCESS) {
				return WERR_INTERNAL_ERROR;
			}
		}
	} else {
		if (!(instanceType & INSTANCE_TYPE_WRITE)) {
			DEBUG(0, ("Refusing to replicate %s from a read-only repilca into a read-write replica!\n",
				  ldb_dn_get_linearized(msg->dn)));
			return WERR_DS_DRA_SOURCE_IS_PARTIAL_REPLICA;
		}
	}

	whenChanged_t = nt_time_to_unix(whenChanged);
	whenChanged_s = ldb_timestring(msg, whenChanged_t);
	W_ERROR_HAVE_NO_MEMORY(whenChanged_s);

	nt_status = GUID_to_ndr_blob(&in->object.identifier->guid, msg, &guid_value);
	if (!NT_STATUS_IS_OK(nt_status)) {
		return ntstatus_to_werror(nt_status);
	}

	if (in->parent_object_guid) {
		nt_status = GUID_to_ndr_blob(in->parent_object_guid, msg, &parent_guid_value);
		if (!NT_STATUS_IS_OK(nt_status)) {
			return ntstatus_to_werror(nt_status);
		}
	} else {
		parent_guid_value = data_blob_null;
	}

	out->msg		= msg;
	out->guid_value		= guid_value;
	out->parent_guid_value	= parent_guid_value;
	out->when_changed	= whenChanged_s;
	out->meta_data		= md;
	return WERR_OK;
}
示例#6
0
static NTSTATUS wreplsrv_scavenging_owned_records(struct wreplsrv_service *service, TALLOC_CTX *tmp_mem)
{
	NTSTATUS status;
	struct winsdb_record *rec = NULL;
	struct ldb_result *res = NULL;
	const char *owner_filter;
	const char *filter;
	unsigned int i;
	int ret;
	time_t now = time(NULL);
	const char *now_timestr;
	const char *action;
	const char *old_state=NULL;
	const char *new_state=NULL;
	uint32_t modify_flags;
	bool modify_record;
	bool delete_record;
	bool delete_tombstones;
	struct timeval tombstone_extra_time;
	const char *local_owner = service->wins_db->local_owner;
	bool propagate = lpcfg_parm_bool(service->task->lp_ctx, NULL, "wreplsrv", "propagate name releases", false);

	now_timestr = ldb_timestring(tmp_mem, now);
	NT_STATUS_HAVE_NO_MEMORY(now_timestr);
	owner_filter = wreplsrv_owner_filter(service, tmp_mem, local_owner);
	NT_STATUS_HAVE_NO_MEMORY(owner_filter);
	filter = talloc_asprintf(tmp_mem,
				 "(&%s(objectClass=winsRecord)"
				 "(expireTime<=%s))",
				 owner_filter, now_timestr);
	NT_STATUS_HAVE_NO_MEMORY(filter);
	ret = ldb_search(service->wins_db->ldb, tmp_mem, &res, NULL, LDB_SCOPE_SUBTREE, NULL, "%s", filter);
	if (ret != LDB_SUCCESS) return NT_STATUS_INTERNAL_DB_CORRUPTION;
	DEBUG(10,("WINS scavenging: filter '%s' count %d\n", filter, res->count));

	tombstone_extra_time = timeval_add(&service->startup_time,
					   service->config.tombstone_extra_timeout,
					   0);
	delete_tombstones = timeval_expired(&tombstone_extra_time);

	for (i=0; i < res->count; i++) {
		bool has_replicas = false;

		/*
		 * we pass '0' as 'now' here,
		 * because we want to get the raw timestamps which are in the DB
		 */
		status = winsdb_record(service->wins_db, res->msgs[i], tmp_mem, 0, &rec);
		NT_STATUS_NOT_OK_RETURN(status);
		talloc_free(res->msgs[i]);

		modify_flags	= 0;
		modify_record	= false;
		delete_record	= false;

		switch (rec->state) {
		case WREPL_STATE_ACTIVE:
			old_state	= "active";
			if (rec->is_static) {
				/*
				 *we store it again, so that it won't appear
				 * in the scavenging the next time
				 */
				old_state	= "active(static)";
				new_state	= "active(static)";
				modify_flags	= 0;
				modify_record	= true;
				break;
			}
			if (rec->type != WREPL_TYPE_SGROUP || !propagate) {
				new_state	= "released";
				rec->state	= WREPL_STATE_RELEASED;
				rec->expire_time= service->config.tombstone_interval + now;
				modify_flags	= 0;
				modify_record	= true;
				break;
			}
			/* check if there's any replica address */
			for (i=0;rec->addresses[i];i++) {
				if (strcmp(rec->addresses[i]->wins_owner, local_owner) != 0) {
					has_replicas = true;
					rec->addresses[i]->expire_time= service->config.renew_interval + now;
				}
			}
			if (has_replicas) {
				/* if it has replica addresses propagate them */
				new_state	= "active(propagated)";
				rec->state	= WREPL_STATE_ACTIVE;
				rec->expire_time= service->config.renew_interval + now;
				modify_flags	= WINSDB_FLAG_ALLOC_VERSION | WINSDB_FLAG_TAKE_OWNERSHIP;
				modify_record	= true;
				break;
			}
			/*
			 * if it doesn't have replica addresses, make it a tombstone,
			 * so that the released owned addresses are propagated
			 */
			new_state	= "tombstone";
			rec->state	= WREPL_STATE_TOMBSTONE;
			rec->expire_time= time(NULL) +
					  service->config.tombstone_interval +
					  service->config.tombstone_timeout;
			modify_flags	= WINSDB_FLAG_ALLOC_VERSION | WINSDB_FLAG_TAKE_OWNERSHIP;
			modify_record	= true;
			break;

		case WREPL_STATE_RELEASED:
			old_state	= "released";
			new_state	= "tombstone";
			rec->state	= WREPL_STATE_TOMBSTONE;
			rec->expire_time= service->config.tombstone_timeout + now;
			modify_flags	= WINSDB_FLAG_ALLOC_VERSION | WINSDB_FLAG_TAKE_OWNERSHIP;
			modify_record	= true;
			break;

		case WREPL_STATE_TOMBSTONE:
			old_state	= "tombstone";
			new_state	= "tombstone";
			if (!delete_tombstones) break;
			new_state	= "deleted";
			delete_record = true;
			break;

		case WREPL_STATE_RESERVED:
			DEBUG(0,("%s: corrupted record: %s\n",
				__location__, nbt_name_string(rec, rec->name)));
			return NT_STATUS_INTERNAL_DB_CORRUPTION;
		}

		if (modify_record) {
			action = "modify";
			ret = winsdb_modify(service->wins_db, rec, modify_flags);
		} else if (delete_record) {
			action = "delete";
			ret = winsdb_delete(service->wins_db, rec);
		} else {
			action = "skip";
			ret = NBT_RCODE_OK;
		}

		if (ret != NBT_RCODE_OK) {
			DEBUG(2,("WINS scavenging: failed to %s name %s (owned:%s -> owned:%s): error:%u\n",
				action, nbt_name_string(rec, rec->name), old_state, new_state, ret));
		} else {
			DEBUG(4,("WINS scavenging: %s name: %s (owned:%s -> owned:%s)\n",
				action, nbt_name_string(rec, rec->name), old_state, new_state));
		}

		talloc_free(rec);
	}

	return NT_STATUS_OK;
}