[PATCH 1/5] dns: Add dns_get_authoritative_zone helper function

[Kai Blin]

Signed-off-by: Kai Blin <kai at samba.org>
---
 source4/dns_server/dns_server.h |  2 ++
 source4/dns_server/dns_utils.c  | 16 ++++++++++++++++
 2 files changed, 18 insertions(+)

diff --git a/source4/dns_server/dns_server.h b/source4/dns_server/dns_server.h
index 3423ee0..64b716a 100644
--- a/source4/dns_server/dns_server.h
+++ b/source4/dns_server/dns_server.h
@@ -93,6 +93,8 @@ bool dns_records_match(struct dnsp_DnssrvRpcRecord *rec1,
 		       struct dnsp_DnssrvRpcRecord *rec2);
 bool dns_authorative_for_zone(struct dns_server *dns,
 			      const char *name);
+const char *dns_get_authoritative_zone(struct dns_server *dns,
+				       const char *name);
 WERROR dns_lookup_records(struct dns_server *dns,
 			  TALLOC_CTX *mem_ctx,
 			  struct ldb_dn *dn,
diff --git a/source4/dns_server/dns_utils.c b/source4/dns_server/dns_utils.c
index c757c15..28412eb 100644
--- a/source4/dns_server/dns_utils.c
+++ b/source4/dns_server/dns_utils.c
@@ -199,6 +199,22 @@ bool dns_authorative_for_zone(struct dns_server *dns,
 	return true;
 }
 
+const char *dns_get_authoritative_zone(struct dns_server *dns,
+				       const char *name)
+{
+	const struct dns_server_zone *z;
+	size_t host_part_len = 0;
+
+	for (z = dns->zones; z != NULL; z = z->next) {
+		bool match;
+		match = dns_name_match(z->name, name, &host_part_len);
+		if (match) {
+			return z->name;
+		}
+	}
+	return NULL;
+}
+
 WERROR dns_name2dn(struct dns_server *dns,
 		   TALLOC_CTX *mem_ctx,
 		   const char *name,
-- 
1.9.1