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-rw-r--r--source4/dsdb/samdb/ldb_modules/dns_notify.c450
1 files changed, 450 insertions, 0 deletions
diff --git a/source4/dsdb/samdb/ldb_modules/dns_notify.c b/source4/dsdb/samdb/ldb_modules/dns_notify.c
new file mode 100644
index 0000000..41973ef
--- /dev/null
+++ b/source4/dsdb/samdb/ldb_modules/dns_notify.c
@@ -0,0 +1,450 @@
+/*
+ ldb database library
+
+ Copyright (C) Samuel Cabrero <samuelcabrero@kernevil.me> 2014
+
+ 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/>.
+*/
+
+/*
+ * Name: ldb
+ *
+ * Component: ldb dns_notify module
+ *
+ * Description: Notify the DNS server when zones are changed, either by direct
+ * RPC management calls or DRS inbound replication.
+ *
+ * Author: Samuel Cabrero <samuelcabrero@kernevil.me>
+ */
+
+#include "includes.h"
+#include "ldb_module.h"
+#include "dsdb/samdb/ldb_modules/util.h"
+#include "dsdb/samdb/samdb.h"
+#include "dsdb/common/proto.h"
+#include "librpc/gen_ndr/ndr_irpc.h"
+#include "lib/messaging/irpc.h"
+#include "librpc/gen_ndr/ndr_irpc_c.h"
+#include "param/param.h"
+#include "util/dlinklist.h"
+
+#undef strcasecmp
+
+struct dns_notify_watched_dn {
+ struct dns_notify_watched_dn *next, *prev;
+ struct ldb_dn *dn;
+};
+
+struct dns_notify_private {
+ struct dns_notify_watched_dn *watched;
+ bool reload_zones;
+};
+
+struct dns_notify_dnssrv_state {
+ struct imessaging_context *msg_ctx;
+ struct dnssrv_reload_dns_zones r;
+};
+
+static void dns_notify_dnssrv_done(struct tevent_req *req)
+{
+ NTSTATUS status;
+ struct dns_notify_dnssrv_state *state;
+
+ state = tevent_req_callback_data(req, struct dns_notify_dnssrv_state);
+
+ status = dcerpc_dnssrv_reload_dns_zones_r_recv(req, state);
+ if (!NT_STATUS_IS_OK(status)) {
+ DEBUG(1, ("%s: Error notifying dns server: %s\n",
+ __func__, nt_errstr(status)));
+ }
+ imessaging_cleanup(state->msg_ctx);
+
+ talloc_free(req);
+ talloc_free(state);
+}
+
+static void dns_notify_dnssrv_send(struct ldb_module *module)
+{
+ struct ldb_context *ldb;
+ struct loadparm_context *lp_ctx;
+ struct dns_notify_dnssrv_state *state;
+ struct dcerpc_binding_handle *handle;
+ struct tevent_req *req;
+
+ ldb = ldb_module_get_ctx(module);
+
+ lp_ctx = ldb_get_opaque(ldb, "loadparm");
+ if (lp_ctx == NULL) {
+ return;
+ }
+
+ state = talloc_zero(module, struct dns_notify_dnssrv_state);
+ if (state == NULL) {
+ return;
+ }
+
+ /* Initialize messaging client */
+ state->msg_ctx = imessaging_client_init(state, lp_ctx,
+ ldb_get_event_context(ldb));
+ if (state->msg_ctx == NULL) {
+ ldb_asprintf_errstring(ldb, "Failed to generate client messaging context in %s",
+ lpcfg_imessaging_path(state, lp_ctx));
+ talloc_free(state);
+ return;
+ }
+
+ /* Get a handle to notify the DNS server */
+ handle = irpc_binding_handle_by_name(state, state->msg_ctx,
+ "dnssrv",
+ &ndr_table_irpc);
+ if (handle == NULL) {
+ imessaging_cleanup(state->msg_ctx);
+ talloc_free(state);
+ return;
+ }
+
+ /* Send the notifications */
+ req = dcerpc_dnssrv_reload_dns_zones_r_send(state,
+ ldb_get_event_context(ldb),
+ handle,
+ &state->r);
+ if (req == NULL) {
+ imessaging_cleanup(state->msg_ctx);
+ talloc_free(state);
+ return;
+ }
+ tevent_req_set_callback(req, dns_notify_dnssrv_done, state);
+}
+
+static int dns_notify_add(struct ldb_module *module, struct ldb_request *req)
+{
+ struct ldb_context *ldb;
+ struct dns_notify_private *data;
+ struct dns_notify_watched_dn *w;
+ struct dsdb_schema *schema;
+ const struct dsdb_class *objectclass;
+
+ if (ldb_dn_is_special(req->op.add.message->dn)) {
+ return ldb_next_request(module, req);
+ }
+
+ if (ldb_request_get_control(req, LDB_CONTROL_RELAX_OID)) {
+ return ldb_next_request(module, req);
+ }
+
+ ldb = ldb_module_get_ctx(module);
+ data = talloc_get_type(ldb_module_get_private(module),
+ struct dns_notify_private);
+ if (data == NULL) {
+ return ldb_operr(ldb);
+ }
+
+ for (w = data->watched; w; w = w->next) {
+ if (ldb_dn_compare_base(w->dn, req->op.add.message->dn) == 0) {
+ schema = dsdb_get_schema(ldb, req);
+ if (schema == NULL) {
+ return ldb_operr(ldb);
+ }
+
+ objectclass = dsdb_get_structural_oc_from_msg(schema, req->op.add.message);
+ if (objectclass == NULL) {
+ return ldb_operr(ldb);
+ }
+
+ if (ldb_attr_cmp(objectclass->lDAPDisplayName, "dnsZone") == 0) {
+ data->reload_zones = true;
+ break;
+ }
+ }
+ }
+
+ return ldb_next_request(module, req);
+}
+
+static int dns_notify_modify(struct ldb_module *module, struct ldb_request *req)
+{
+ TALLOC_CTX *tmp_ctx;
+ struct ldb_context *ldb;
+ struct dns_notify_private *data;
+ struct dns_notify_watched_dn *w;
+ struct ldb_dn *dn;
+ struct ldb_result *res;
+ struct dsdb_schema *schema;
+ const struct dsdb_class *objectclass;
+ const char * const attrs[] = { "objectClass", NULL };
+ int ret;
+
+ if (ldb_dn_is_special(req->op.mod.message->dn)) {
+ return ldb_next_request(module, req);
+ }
+
+ if (ldb_request_get_control(req, LDB_CONTROL_RELAX_OID)) {
+ return ldb_next_request(module, req);
+ }
+
+ ldb = ldb_module_get_ctx(module);
+ data = talloc_get_type(ldb_module_get_private(module),
+ struct dns_notify_private);
+ if (data == NULL) {
+ return ldb_operr(ldb);
+ }
+
+ tmp_ctx = talloc_new(module);
+ if (tmp_ctx == NULL) {
+ return ldb_oom(ldb);
+ }
+
+ for (w = data->watched; w; w = w->next) {
+ if (ldb_dn_compare_base(w->dn, req->op.add.message->dn) == 0) {
+ dn = ldb_dn_copy(tmp_ctx, req->op.mod.message->dn);
+
+ ret = dsdb_module_search_dn(module, tmp_ctx, &res, dn, attrs,
+ DSDB_FLAG_NEXT_MODULE |
+ DSDB_SEARCH_SHOW_RECYCLED |
+ DSDB_SEARCH_REVEAL_INTERNALS |
+ DSDB_SEARCH_SHOW_DN_IN_STORAGE_FORMAT, req);
+ if (ret != LDB_SUCCESS) {
+ /*
+ * We want the give the caller the
+ * error from trying the actual
+ * request, below
+ */
+ break;
+ }
+
+ schema = dsdb_get_schema(ldb, req);
+ if (schema == NULL) {
+ talloc_free(tmp_ctx);
+ return ldb_operr(ldb);
+ }
+
+ objectclass = dsdb_get_structural_oc_from_msg(schema, res->msgs[0]);
+ if (objectclass == NULL) {
+ talloc_free(tmp_ctx);
+ return ldb_operr(ldb);
+ }
+
+ if (ldb_attr_cmp(objectclass->lDAPDisplayName, "dnsZone") == 0) {
+ data->reload_zones = true;
+ break;
+ }
+ }
+ }
+
+ talloc_free(tmp_ctx);
+ return ldb_next_request(module, req);
+}
+
+static int dns_notify_delete(struct ldb_module *module, struct ldb_request *req)
+{
+ TALLOC_CTX *tmp_ctx;
+ struct ldb_context *ldb;
+ struct dns_notify_private *data;
+ struct dns_notify_watched_dn *w;
+ struct ldb_dn *old_dn;
+ struct ldb_result *res;
+ struct dsdb_schema *schema;
+ const struct dsdb_class *objectclass;
+ const char * const attrs[] = { "objectClass", NULL };
+ int ret;
+
+ if (ldb_dn_is_special(req->op.del.dn)) {
+ return ldb_next_request(module, req);
+ }
+
+ if (ldb_request_get_control(req, LDB_CONTROL_RELAX_OID)) {
+ return ldb_next_request(module, req);
+ }
+
+ ldb = ldb_module_get_ctx(module);
+ data = talloc_get_type(ldb_module_get_private(module),
+ struct dns_notify_private);
+ if (data == NULL) {
+ return ldb_operr(ldb);
+ }
+
+ tmp_ctx = talloc_new(module);
+ if (tmp_ctx == NULL) {
+ return ldb_oom(ldb);
+ }
+
+ for (w = data->watched; w; w = w->next) {
+ if (ldb_dn_compare_base(w->dn, req->op.add.message->dn) == 0) {
+ old_dn = ldb_dn_copy(tmp_ctx, req->op.del.dn);
+ ret = dsdb_module_search_dn(module, tmp_ctx, &res, old_dn, attrs,
+ DSDB_FLAG_NEXT_MODULE |
+ DSDB_SEARCH_SHOW_RECYCLED |
+ DSDB_SEARCH_REVEAL_INTERNALS |
+ DSDB_SEARCH_SHOW_DN_IN_STORAGE_FORMAT, req);
+ if (ret != LDB_SUCCESS) {
+ /*
+ * We want the give the caller the
+ * error from trying the actual
+ * request, below
+ */
+ break;
+ }
+
+ schema = dsdb_get_schema(ldb, req);
+ if (schema == NULL) {
+ talloc_free(tmp_ctx);
+ return ldb_operr(ldb);
+ }
+
+ objectclass = dsdb_get_structural_oc_from_msg(schema, res->msgs[0]);
+ if (objectclass == NULL) {
+ talloc_free(tmp_ctx);
+ return ldb_operr(ldb);
+ }
+
+ if (ldb_attr_cmp(objectclass->lDAPDisplayName, "dnsZone") == 0) {
+ data->reload_zones = true;
+ break;
+ }
+ }
+ }
+
+ talloc_free(tmp_ctx);
+ return ldb_next_request(module, req);
+}
+
+static int dns_notify_start_trans(struct ldb_module *module)
+{
+ struct ldb_context *ldb;
+ struct dns_notify_private *data;
+
+ ldb = ldb_module_get_ctx(module);
+ data = talloc_get_type(ldb_module_get_private(module),
+ struct dns_notify_private);
+ if (data == NULL) {
+ return ldb_operr(ldb);
+ }
+
+ data->reload_zones = false;
+
+ return ldb_next_start_trans(module);
+}
+
+static int dns_notify_end_trans(struct ldb_module *module)
+{
+ struct ldb_context *ldb;
+ struct dns_notify_private *data;
+ int ret;
+
+ ldb = ldb_module_get_ctx(module);
+ data = talloc_get_type(ldb_module_get_private(module),
+ struct dns_notify_private);
+ if (data == NULL) {
+ return ldb_operr(ldb);
+ }
+
+ ret = ldb_next_end_trans(module);
+ if (ret == LDB_SUCCESS) {
+ if (data->reload_zones) {
+ dns_notify_dnssrv_send(module);
+ }
+ }
+
+ return ret;
+}
+
+static int dns_notify_del_trans(struct ldb_module *module)
+{
+ struct ldb_context *ldb;
+ struct dns_notify_private *data;
+
+ ldb = ldb_module_get_ctx(module);
+ data = talloc_get_type(ldb_module_get_private(module),
+ struct dns_notify_private);
+ if (data == NULL) {
+ return ldb_operr(ldb);
+ }
+
+ data->reload_zones = false;
+
+ return ldb_next_del_trans(module);
+}
+
+static int dns_notify_init(struct ldb_module *module)
+{
+ struct ldb_context *ldb;
+ struct dns_notify_private *data;
+ struct dns_notify_watched_dn *watched;
+ struct ldb_dn *domain_dn;
+ struct ldb_dn *forest_dn;
+
+ ldb = ldb_module_get_ctx(module);
+
+ data = talloc_zero(module, struct dns_notify_private);
+ if (data == NULL) {
+ return ldb_oom(ldb);
+ }
+
+ domain_dn = ldb_get_default_basedn(ldb);
+ forest_dn = ldb_get_root_basedn(ldb);
+
+ /* Register hook on domain partition */
+ watched = talloc_zero(data, struct dns_notify_watched_dn);
+ if (watched == NULL) {
+ talloc_free(data);
+ return ldb_oom(ldb);
+ }
+ watched->dn = ldb_dn_new_fmt(watched, ldb,
+ "CN=MicrosoftDNS,CN=System,%s",
+ ldb_dn_get_linearized(domain_dn));
+ if (watched->dn == NULL) {
+ talloc_free(data);
+ return ldb_oom(ldb);
+ }
+ DLIST_ADD(data->watched, watched);
+
+ /* Check for DomainDnsZones partition and register hook */
+ watched = talloc_zero(data, struct dns_notify_watched_dn);
+ if (watched == NULL) {
+ talloc_free(data);
+ return ldb_oom(ldb);
+ }
+ watched->dn = ldb_dn_new_fmt(watched, ldb, "CN=MicrosoftDNS,DC=DomainDnsZones,%s", ldb_dn_get_linearized(forest_dn));
+ DLIST_ADD(data->watched, watched);
+
+ /* Check for ForestDnsZones partition and register hook */
+ watched = talloc_zero(data, struct dns_notify_watched_dn);
+ if (watched == NULL) {
+ talloc_free(data);
+ return ldb_oom(ldb);
+ }
+ watched->dn = ldb_dn_new_fmt(watched, ldb, "CN=MicrosoftDNS,DC=ForestDnsZones,%s", ldb_dn_get_linearized(forest_dn));
+ DLIST_ADD(data->watched, watched);
+
+ ldb_module_set_private(module, data);
+
+ return ldb_next_init(module);
+}
+
+static const struct ldb_module_ops ldb_dns_notify_module_ops = {
+ .name = "dns_notify",
+ .init_context = dns_notify_init,
+ .add = dns_notify_add,
+ .modify = dns_notify_modify,
+ .del = dns_notify_delete,
+ .start_transaction = dns_notify_start_trans,
+ .end_transaction = dns_notify_end_trans,
+ .del_transaction = dns_notify_del_trans,
+};
+
+int ldb_dns_notify_module_init(const char *version)
+{
+ LDB_MODULE_CHECK_VERSION(version);
+ return ldb_register_module(&ldb_dns_notify_module_ops);
+}
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