add ttl to ZoneData

easytier/src/proto/dns.proto

@@ -7,8 +7,9 @@ package dns;
 message ZoneData {
   common.UUID id = 1;
   string origin = 2;
-  repeated string records = 3;
-  repeated common.Url forwarders = 4;
+  uint32 ttl = 3;
+  repeated string records = 4;
+  repeated common.Url forwarders = 5;
 }
 
 message GetExportConfigRequest {}

easytier/src/proto/dns.rs

@@ -30,6 +30,8 @@ impl Display for ZoneData {
         }
         writeln!(f)?;
 
+        writeln!(f, "$TTL {}", self.ttl)?;
+
         for record in &self.records {
             writeln!(f, "{}", record)?;
         }