refactor: refine DNS handling to follow config and merge settings

src-tauri/src/enhance/tun.rs

@@ -24,18 +24,20 @@ pub async fn use_tun(mut config: Mapping, enable: bool) -> Mapping {
     let mut tun_val = tun_val.map_or(Mapping::new(), |val| {
         val.as_mapping().cloned().unwrap_or(Mapping::new())
     });
-    let dns_key = Value::from("dns");
-    let dns_val = config.get(&dns_key);
-    let mut dns_val = dns_val.map_or(Mapping::new(), |val| {
-        val.as_mapping().cloned().unwrap_or(Mapping::new())
-    });
-    let ipv6_key = Value::from("ipv6");
-    let ipv6_val = config
-        .get(&ipv6_key)
-        .and_then(|v| v.as_bool())
-        .unwrap_or(false);
     
     if enable {
+        // 读取DNS配置
+        let dns_key = Value::from("dns");
+        let dns_val = config.get(&dns_key);
+        let mut dns_val = dns_val.map_or(Mapping::new(), |val| {
+            val.as_mapping().cloned().unwrap_or(Mapping::new())
+        });
+        let ipv6_key = Value::from("ipv6");
+        let ipv6_val = config
+            .get(&ipv6_key)
+            .and_then(|v| v.as_bool())
+            .unwrap_or(false);
+
         // 检查现有的 enhanced-mode 设置
         let current_mode = dns_val
             .get(&Value::from("enhanced-mode"))
@@ -61,42 +63,18 @@ pub async fn use_tun(mut config: Mapping, enable: bool) -> Mapping {
                 crate::utils::resolve::set_public_dns("223.6.6.6".to_string()).await;
             }
         }
+        
+        // 当TUN启用时，将修改后的DNS配置写回
+        revise!(config, "dns", dns_val);
     } else {
-        revise!(
+        // TUN未启用时，仅恢复系统DNS，不修改配置文件中的DNS设置
-            dns_val,
-            "enable",
-            dns_val
-                .get("enable")
-                .and_then(|v| v.as_bool())
-                .unwrap_or(true)
-        );
-
-        revise!(dns_val, "ipv6", ipv6_val);
-
-        revise!(
-            dns_val,
-            "enhanced-mode",
-            dns_val
-                .get("enhanced-mode")
-                .and_then(|v| v.as_str())
-                .unwrap_or("redir-host")
-        );
-
-        revise!(
-            dns_val,
-            "fake-ip-range",
-            dns_val
-                .get("fake-ip-range")
-                .and_then(|v| v.as_str())
-                .unwrap_or("198.18.0.1/16")
-        );
-
         #[cfg(target_os = "macos")]
         crate::utils::resolve::restore_public_dns().await;
     }
 
+    // 更新TUN配置
     revise!(tun_val, "enable", enable);
     revise!(config, "tun", tun_val);
-    revise!(config, "dns", dns_val);
+    
     config
 }