From 185eb1e4c26ec37754f42bd959e04674fc46622b Mon Sep 17 00:00:00 2001
From: Luna Yao <40349250+ZnqbuZ@users.noreply.github.com>
Date: Sat, 18 Apr 2026 23:03:46 +0200
Subject: [PATCH] move sanitize and parse

fmt dns

dns utils

fmt

unit test

unit test
---
 easytier/src/dns/config/dns.rs |  2 +-
 easytier/src/dns/utils/mod.rs  | 39 ------------------
 easytier/src/utils/dns.rs      | 72 ++++++++++++++++++++++++++++++----
 3 files changed, 66 insertions(+), 47 deletions(-)

diff --git a/easytier/src/dns/config/dns.rs b/easytier/src/dns/config/dns.rs
index 3b77e0d3..57d2817a 100644
--- a/easytier/src/dns/config/dns.rs
+++ b/easytier/src/dns/config/dns.rs
@@ -3,8 +3,8 @@ use crate::dns::config::zone::ZoneConfig;
 use crate::dns::config::{DNS_DEFAULT_ADDRESS, DNS_DEFAULT_DOMAIN};
 use crate::dns::server::DnsServer;
 use crate::dns::utils::addr::NameServerAddrGroup;
-use crate::dns::utils::parse;
 use crate::proto::dns::GetExportConfigResponse;
+use crate::utils::dns::parse;
 use derivative::Derivative;
 use hickory_net::xfer::Protocol;
 use hickory_proto::rr::{LowerName, Name};
diff --git a/easytier/src/dns/utils/mod.rs b/easytier/src/dns/utils/mod.rs
index ee103359..d969700b 100644
--- a/easytier/src/dns/utils/mod.rs
+++ b/easytier/src/dns/utils/mod.rs
@@ -1,42 +1,3 @@
-use hickory_proto::rr::LowerName;
-use idna::AsciiDenyList;
-
 pub mod addr;
 pub mod response;
 pub mod zone_handler;
-
-pub fn sanitize(name: &str) -> String {
-    let dot = name.ends_with('.');
-    let mut name = idna::domain_to_ascii_cow(name.as_ref(), AsciiDenyList::EMPTY)
-        .unwrap_or_default()
-        .into_owned()
-        .to_lowercase()
-        .split('.')
-        .map(|label| {
-            label
-                .chars()
-                .map(|c| if c.is_ascii_alphanumeric() { c } else { '-' })
-                .take(63)
-                .collect::<String>()
-                .trim_matches('-')
-                .to_string()
-        })
-        .filter(|label| !label.is_empty())
-        .collect::<Vec<_>>()
-        .join(".");
-    name.truncate(253);
-    if dot {
-        name.push('.');
-    }
-    name
-}
-
-pub fn parse(name: &str) -> LowerName {
-    if let Ok(name) = name.parse() {
-        name
-    } else {
-        let sanitized = sanitize(name);
-        tracing::debug!("invalid name: {}, sanitized to: {}", name, sanitized);
-        sanitized.parse().unwrap_or_default()
-    }
-}
diff --git a/easytier/src/utils/dns.rs b/easytier/src/utils/dns.rs
index e190777e..81c37572 100644
--- a/easytier/src/utils/dns.rs
+++ b/easytier/src/utils/dns.rs
@@ -1,24 +1,57 @@
-use std::fmt::Debug;
-use std::net::SocketAddr;
-use std::sync::atomic::AtomicBool;
-use std::sync::Arc;
-
+use crate::common::error::Error;
 use anyhow::Context;
 use hickory_net::runtime::TokioRuntimeProvider;
 use hickory_proto::rr::rdata::SRV;
-use hickory_proto::rr::{IntoName, RData};
+use hickory_proto::rr::{IntoName, LowerName, RData};
 use hickory_resolver::config::{
     ConnectionConfig, LookupIpStrategy, NameServerConfig, ResolverConfig, ResolverOpts,
 };
 use hickory_resolver::system_conf::read_system_conf;
 use hickory_resolver::{Resolver, TokioResolver};
+use idna::AsciiDenyList;
 use once_cell::sync::Lazy;
 use std::net::SocketAddr;
 use std::sync::Arc;
 use std::sync::atomic::AtomicBool;
 use tokio::net::lookup_host;
 
-use crate::common::error::Error;
+pub fn sanitize(name: impl AsRef<str>) -> String {
+    let name = name.as_ref();
+    let dot = name.ends_with('.');
+    let mut name = idna::domain_to_ascii_cow(name.as_ref(), AsciiDenyList::EMPTY)
+        .unwrap_or_default()
+        .into_owned()
+        .to_lowercase()
+        .split('.')
+        .map(|label| {
+            label
+                .chars()
+                .map(|c| if c.is_ascii_alphanumeric() { c } else { '-' })
+                .take(63)
+                .collect::<String>()
+                .trim_matches('-')
+                .to_string()
+        })
+        .filter(|label| !label.is_empty())
+        .collect::<Vec<_>>()
+        .join(".");
+    name.truncate(253);
+    if dot {
+        name.push('.');
+    }
+    name
+}
+
+pub fn parse(name: impl AsRef<str>) -> LowerName {
+    let name = name.as_ref();
+    if let Ok(name) = name.parse() {
+        name
+    } else {
+        let sanitized = sanitize(name);
+        tracing::debug!("invalid name: {}, sanitized to: {}", name, sanitized);
+        sanitized.parse().unwrap_or_default()
+    }
+}
 
 pub fn resolver_conf() -> (ResolverConfig, ResolverOpts) {
     let mut config = ResolverConfig::default();
@@ -161,6 +194,31 @@ mod tests {
 
     use super::*;
 
+    #[test]
+    fn parse_matrix_cases() {
+        let cases = [
+            ["Example.COM.", "example.com."],
+            ["a_b!.et.net.", "a-b.et.net."],
+            ["foo..bar.com.", "foo.bar.com."],
+            [
+                "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa.com.",
+                "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa.com.",
+            ],
+            ["___", "___"],
+            ["!", ""],
+            ["", ""],
+        ];
+
+        for [input, expected] in cases {
+            let parsed = parse(input);
+            let expected: LowerName = expected.parse().unwrap();
+            assert_eq!(
+                parsed, expected,
+                "parse({input:?}) should equal {expected:?}, got {parsed:?}"
+            );
+        }
+    }
+
     #[tokio::test]
     async fn test_socket_addrs() {
         let url = url::Url::parse("tcp://github-ci-test.easytier.cn:80").unwrap();