add tld-dns-zone for customizing top-level domain (TLD) zone (#1436)

easytier/src/instance/dns_server/client_instance.rs

@@ -17,7 +17,7 @@ use crate::{
     tunnel::tcp::TcpTunnelConnector,
 };
 
-use super::{DEFAULT_ET_DNS_ZONE, MAGIC_DNS_INSTANCE_ADDR};
+use super::MAGIC_DNS_INSTANCE_ADDR;
 
 pub struct MagicDnsClientInstance {
     rpc_client: StandAloneClient<TcpTunnelConnector>,
@@ -68,9 +68,11 @@ impl MagicDnsClientInstance {
                 ipv4_addr: ctx.get_ipv4().map(Into::into),
                 ..Default::default()
             });
+            // Use configured tld_dns_zone (always set by default)
+            let flags = ctx.config.get_flags();
             let req = UpdateDnsRecordRequest {
                 routes,
-                zone: DEFAULT_ET_DNS_ZONE.to_string(),
+                zone: flags.tld_dns_zone.clone(),
             };
             tracing::debug!(
                 "MagicDnsClientInstance::update_dns_task: update dns records: {:?}",