feat(config): use IpAddr instead of String, set defaults

src/config.rs

@@ -1,12 +1,23 @@
-use std::{collections::HashSet, io::Read, net::Ipv4Addr};
+use std::{
+    collections::HashSet,
+    io::Read,
+    net::{IpAddr, Ipv4Addr},
+};
 
-use crate::{error::AppResult, serde_addr::TargetAddr};
+use crate::{
+    error::AppResult,
+    serde_addr::{TargetAddr, LOCALHOST_V4},
+};
 
 #[derive(serde::Deserialize)]
 pub struct Config {
-    pub host: String,
+    #[serde(default = "default_host")]
+    pub host: IpAddr,
+    #[serde(default = "default_port")]
     pub port: u16,
+    #[serde(default)]
     pub local: HashSet<TargetAddr>,
+    #[serde(default)]
     pub remote: HashSet<TargetAddr>,
 }
 
@@ -20,12 +31,25 @@ pub fn parse() -> AppResult<Config> {
         Ok(toml::from_str(&buf)?)
     } else {
         let mut local = HashSet::new();
-        local.insert((Ipv4Addr::new(127, 0, 0, 1).into(), 5232).into());
+        local.insert((LOCALHOST_V4, 5232).into());
+
+        let remote = HashSet::new();
+
         Ok(Config {
-            host: "0.0.0.0".to_owned(),
+            host: default_host(),
-            port: 5233,
+            port: default_port(),
             local,
-            remote: HashSet::new(),
+            remote,
         })
     }
 }
+
+#[inline]
+const fn default_host() -> IpAddr {
+    IpAddr::V4(Ipv4Addr::new(0, 0, 0, 0))
+}
+
+#[inline]
+const fn default_port() -> u16 {
+    5233
+}

src/main.rs

@@ -17,7 +17,7 @@ async fn main() -> AppResult<()> {
     let config = Arc::new(config::parse()?);
     let auth = Arc::new(socks::auth::NoAuth);
 
-    let listener = TcpListener::bind((config.host.as_str(), config.port)).await?;
+    let listener = TcpListener::bind((config.host, config.port)).await?;
     let server = socks::Server::new(listener, auth);
 
     while let Ok((conn, _addr)) = server.accept().await {