fix: address dns review issues

Cargo.lock

@@ -1879,8 +1879,8 @@ dependencies = [
  "base64 0.21.7",
  "libc",
  "log",
- "netlink-packet-core 0.7.0",
+ "netlink-packet-core",
- "netlink-packet-generic 0.3.3",
+ "netlink-packet-generic",
  "netlink-packet-route 0.17.1",
  "netlink-packet-utils",
  "netlink-packet-wireguard",
@@ -2304,7 +2304,7 @@ dependencies = [
  "moka",
  "multimap",
  "natpmp",
- "netlink-packet-core 0.7.0",
+ "netlink-packet-core",
  "netlink-packet-route 0.21.0",
  "netlink-packet-utils",
  "netlink-sys",
@@ -5150,7 +5150,7 @@ dependencies = [
  "dlopen2 0.5.0",
  "ipnet",
  "libc",
- "netlink-packet-core 0.7.0",
+ "netlink-packet-core",
  "netlink-packet-route 0.17.1",
  "netlink-sys",
  "once_cell",
@@ -5169,15 +5169,6 @@ dependencies = [
  "netlink-packet-utils",
 ]
 
-[[package]]
-name = "netlink-packet-core"
-version = "0.8.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "3463cbb78394cb0141e2c926b93fc2197e473394b761986eca3b9da2c63ae0f4"
-dependencies = [
- "paste",
-]
-
 [[package]]
 name = "netlink-packet-generic"
 version = "0.3.3"
@@ -5186,19 +5177,10 @@ checksum = "1cd7eb8ad331c84c6b8cb7f685b448133e5ad82e1ffd5acafac374af4a5a308b"
 dependencies = [
  "anyhow",
  "byteorder",
- "netlink-packet-core 0.7.0",
+ "netlink-packet-core",
  "netlink-packet-utils",
 ]
 
-[[package]]
-name = "netlink-packet-generic"
-version = "0.4.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "2f891b2e0054cac5a684a06628f59568f841c93da4e551239da6e518f539e775"
-dependencies = [
- "netlink-packet-core 0.8.1",
-]
-
 [[package]]
 name = "netlink-packet-route"
 version = "0.17.1"
@@ -5209,7 +5191,7 @@ dependencies = [
  "bitflags 1.3.2",
  "byteorder",
  "libc",
- "netlink-packet-core 0.7.0",
+ "netlink-packet-core",
  "netlink-packet-utils",
 ]
 
@@ -5224,7 +5206,7 @@ dependencies = [
  "byteorder",
  "libc",
  "log",
- "netlink-packet-core 0.7.0",
+ "netlink-packet-core",
  "netlink-packet-utils",
 ]
 
@@ -5242,14 +5224,16 @@ dependencies = [
 
 [[package]]
 name = "netlink-packet-wireguard"
-version = "0.2.4"
+version = "0.2.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "598962d9067d3153a00106da10e7b8276cea68f396f4a22f5b4a079270d92e29"
+checksum = "60b25b050ff1f6a1e23c6777b72db22790fe5b6b5ccfd3858672587a79876c8f"
 dependencies = [
+ "anyhow",
+ "byteorder",
  "libc",
  "log",
- "netlink-packet-core 0.8.1",
+ "netlink-packet-generic",
- "netlink-packet-generic 0.4.0",
+ "netlink-packet-utils",
 ]
 
 [[package]]

easytier/src/instance/dns_server/server_instance.rs

@@ -277,7 +277,10 @@ impl ResponseHandler for ResponseWrapper {
         let mut encoder = BinEncoder::new(&mut buffer);
 
         // `max_size` should be u16::MAX for protocol other than UDP.
-        let max_size = dns_udp::MAX_RECEIVE_BUFFER_SIZE as u16;
+        let max_size = response
+            .edns()
+            .map(|edns| edns.max_payload())
+            .unwrap_or(dns_udp::MAX_RECEIVE_BUFFER_SIZE as u16);
 
         encoder.set_max_size(max_size);
         response