added dns_keynode_next

lib/dns/include/dns/keytable.h

@@ -225,6 +225,12 @@ dns_keynode_key(dns_keynode_t *keynode);
  * Get the DST key associated with keynode.
  */
 
+dns_keynode_t *
+dns_keynode_next(dns_keynode_t *keynode);
+/*
+ * Get the next keynode in the list.
+ */
+
 ISC_LANG_ENDDECLS
 
 #endif /* DNS_KEYTABLE_H */

lib/dns/keytable.c

@@ -372,3 +372,15 @@ dns_keynode_key(dns_keynode_t *keynode) {
 
 	return (keynode->key);
 }
+
+dns_keynode_t *
+dns_keynode_next(dns_keynode_t *keynode) {
+
+	/*
+	 * Get the next keynode in the list.
+	 */
+
+	REQUIRE(VALID_KEYNODE(keynode));
+
+	return (keynode->next);
+}