dns: static records

Modifies bind9 and internal dns to match windows static records behaviour.

BUG: https://bugzilla.samba.org/show_bug.cgi?id=10812

Signed-off-by: Aaron Haslett <aaronhaslett@catalyst.net.nz>
Reviewed-by: Gary Lockyer <gary@catalyst.net.nz>
Reviewed-by: Andrew Bartlett <abartlet@samba.org>

4 files changed, 54 insertions, 23 deletions

diff --git a/source4/dns_server/dlz_bind9.c b/source4/dns_server/dlz_bind9.c
index e55d73ba50f..5f9a71dd741 100644
--- a/source4/dns_server/dlz_bind9.c
+++ b/source4/dns_server/dlz_bind9.c
@@ -1631,18 +1631,7 @@ _PUBLIC_ isc_result_t dlz_addrdataset(const char *name, const char *rdatastr, vo
 		return ISC_R_NOMEMORY;
 	}
 
-	unix_to_nt_time(&t, time(NULL));
-	/*
-	 * convert to seconds (NT time is in 100ns units)
-	 */
-	t /= 10 * 1000 * 1000;
-	/*
-	 * convert to hours
-	 */
-	t /= 3600;
-
 	rec->rank        = DNS_RANK_ZONE;
-	rec->dwTimeStamp = (uint32_t)t;
 
 	if (!b9_parse(state, rdatastr, rec)) {
 		state->log(ISC_LOG_INFO, "samba_dlz: failed to parse rdataset '%s'", rdatastr);
@@ -1704,6 +1693,15 @@ _PUBLIC_ isc_result_t dlz_addrdataset(const char *name, const char *rdatastr, vo
 			return ISC_R_NOMEMORY;
 		}
 		num_recs++;
+
+		if (dns_name_is_static(recs, num_recs)) {
+			rec->dwTimeStamp = 0;
+		} else {
+			unix_to_nt_time(&t, time(NULL));
+			t /= 10 * 1000 * 1000; /* convert to seconds */
+			t /= 3600;	     /* convert to hours */
+			rec->dwTimeStamp = (uint32_t)t;
+		}
 	}
 
 	recs[i] = *rec;
diff --git a/source4/dns_server/dns_update.c b/source4/dns_server/dns_update.c
index ebed4495dbd..f9866611119 100644
--- a/source4/dns_server/dns_update.c
+++ b/source4/dns_server/dns_update.c
@@ -38,7 +38,8 @@
 
 static WERROR dns_rr_to_dnsp(TALLOC_CTX *mem_ctx,
 			     const struct dns_res_rec *rrec,
-			     struct dnsp_DnssrvRpcRecord *r);
+			     struct dnsp_DnssrvRpcRecord *r,
+			     bool name_is_static);
 
 static WERROR check_one_prerequisite(struct dns_server *dns,
 				     TALLOC_CTX *mem_ctx,
@@ -181,7 +182,7 @@ static WERROR check_one_prerequisite(struct dns_server *dns,
 	rec = talloc_zero(mem_ctx, struct dnsp_DnssrvRpcRecord);
 	W_ERROR_HAVE_NO_MEMORY(rec);
 
-	werror = dns_rr_to_dnsp(rec, pr, rec);
+	werror = dns_rr_to_dnsp(rec, pr, rec, dns_name_is_static(ans, acount));
 	W_ERROR_NOT_OK_RETURN(werror);
 
 	for (i = 0; i < acount; i++) {
@@ -297,7 +298,8 @@ static WERROR update_prescan(const struct dns_name_question *zone,
 
 static WERROR dns_rr_to_dnsp(TALLOC_CTX *mem_ctx,
 			     const struct dns_res_rec *rrec,
-			     struct dnsp_DnssrvRpcRecord *r)
+			     struct dnsp_DnssrvRpcRecord *r,
+			     bool name_is_static)
 {
 	enum ndr_err_code ndr_err;
 	NTTIME t;
@@ -311,10 +313,14 @@ static WERROR dns_rr_to_dnsp(TALLOC_CTX *mem_ctx,
 	r->wType = (enum dns_record_type) rrec->rr_type;
 	r->dwTtlSeconds = rrec->ttl;
 	r->rank = DNS_RANK_ZONE;
-	unix_to_nt_time(&t, time(NULL));
-	t /= 10 * 1000 * 1000;
-	t /= 3600;
-	r->dwTimeStamp = t;
+	if (name_is_static) {
+		r->dwTimeStamp = 0;
+	} else {
+		unix_to_nt_time(&t, time(NULL));
+		t /= 10 * 1000 * 1000;
+		t /= 3600;
+		r->dwTimeStamp = t;
+	}
 
 	/* If we get QCLASS_ANY, we're done here */
 	if (rrec->rr_class == DNS_QCLASS_ANY) {
@@ -390,6 +396,7 @@ static WERROR handle_one_update(struct dns_server *dns,
 	WERROR werror;
 	bool tombstoned = false;
 	bool needs_add = false;
+	bool name_is_static;
 
 	DEBUG(2, ("Looking at record: \n"));
 	if (DEBUGLVL(2)) {
@@ -432,6 +439,8 @@ static WERROR handle_one_update(struct dns_server *dns,
 		first = rcount;
 	}
 
+	name_is_static = dns_name_is_static(recs, rcount);
+
 	if (update->rr_class == zone->question_class) {
 		if (update->rr_type == DNS_QTYPE_CNAME) {
 			/*
@@ -456,7 +465,8 @@ static WERROR handle_one_update(struct dns_server *dns,
 					struct dnsp_DnssrvRpcRecord, rcount + 1);
 			W_ERROR_HAVE_NO_MEMORY(recs);
 
-			werror = dns_rr_to_dnsp(recs, update, &recs[rcount]);
+			werror = dns_rr_to_dnsp(
+			    recs, update, &recs[rcount], name_is_static);
 			W_ERROR_NOT_OK_RETURN(werror);
 			rcount += 1;
 
@@ -508,7 +518,8 @@ static WERROR handle_one_update(struct dns_server *dns,
 				return WERR_OK;
 			}
 
-			werror = dns_rr_to_dnsp(mem_ctx, update, &recs[i]);
+			werror = dns_rr_to_dnsp(
+			    mem_ctx, update, &recs[i], name_is_static);
 			W_ERROR_NOT_OK_RETURN(werror);
 
 			for (i++; i < rcount; i++) {
@@ -532,7 +543,8 @@ static WERROR handle_one_update(struct dns_server *dns,
 				struct dnsp_DnssrvRpcRecord, rcount+1);
 		W_ERROR_HAVE_NO_MEMORY(recs);
 
-		werror = dns_rr_to_dnsp(recs, update, &recs[rcount]);
+		werror =
+		    dns_rr_to_dnsp(recs, update, &recs[rcount], name_is_static);
 		W_ERROR_NOT_OK_RETURN(werror);
 
 		for (i = first; i < rcount; i++) {
@@ -618,7 +630,8 @@ static WERROR handle_one_update(struct dns_server *dns,
 						struct dnsp_DnssrvRpcRecord);
 			W_ERROR_HAVE_NO_MEMORY(ns_rec);
 
-			werror = dns_rr_to_dnsp(ns_rec, update, ns_rec);
+			werror = dns_rr_to_dnsp(
+			    ns_rec, update, ns_rec, name_is_static);
 			W_ERROR_NOT_OK_RETURN(werror);
 
 			for (i = first; i < rcount; i++) {
@@ -635,7 +648,8 @@ static WERROR handle_one_update(struct dns_server *dns,
 		del_rec = talloc(mem_ctx, struct dnsp_DnssrvRpcRecord);
 		W_ERROR_HAVE_NO_MEMORY(del_rec);
 
-		werror = dns_rr_to_dnsp(del_rec, update, del_rec);
+		werror =
+		    dns_rr_to_dnsp(del_rec, update, del_rec, name_is_static);
 		W_ERROR_NOT_OK_RETURN(werror);
 
 		for (i = first; i < rcount; i++) {
diff --git a/source4/dns_server/dnsserver_common.c b/source4/dns_server/dnsserver_common.c
index 2551240fca4..2a493702ed2 100644
--- a/source4/dns_server/dnsserver_common.c
+++ b/source4/dns_server/dnsserver_common.c
@@ -724,6 +724,23 @@ static WERROR check_name_list(TALLOC_CTX *mem_ctx, uint16_t rec_count,
 	return WERR_OK;
 }
 
+bool dns_name_is_static(struct dnsp_DnssrvRpcRecord *records,
+			uint16_t rec_count)
+{
+	int i = 0;
+	for (i = 0; i < rec_count; i++) {
+		if (records[i].wType == DNS_TYPE_TOMBSTONE) {
+			continue;
+		}
+
+		if (records[i].wType == DNS_TYPE_SOA ||
+		    records[i].dwTimeStamp == 0) {
+			return true;
+		}
+	}
+	return false;
+}
+
 WERROR dns_get_zone_properties(struct ldb_context *samdb,
 			       TALLOC_CTX *mem_ctx,
 			       struct ldb_dn *zone_dn,
diff --git a/source4/dns_server/dnsserver_common.h b/source4/dns_server/dnsserver_common.h
index 9067e2234e7..380f61b8dbc 100644
--- a/source4/dns_server/dnsserver_common.h
+++ b/source4/dns_server/dnsserver_common.h
@@ -61,6 +61,8 @@ WERROR dns_get_zone_properties(struct ldb_context *samdb,
 			       TALLOC_CTX *mem_ctx,
 			       struct ldb_dn *zone_dn,
 			       struct dnsserver_zoneinfo *zoneinfo);
+bool dns_name_is_static(struct dnsp_DnssrvRpcRecord *records,
+			uint16_t rec_count);
 WERROR dns_common_replace(struct ldb_context *samdb,
 			  TALLOC_CTX *mem_ctx,
 			  struct ldb_dn *dn,