add option binding server to a specified IP

server/src/config.rs

@@ -9,14 +9,22 @@ use rustls::{version::TLS13, Error as RustlsError, ServerConfig as RustlsServerC
 use serde::{de::Error as DeError, Deserialize, Deserializer};
 use serde_json::Error as JsonError;
 use std::{
-    collections::HashSet, env::ArgsOs, fmt::Display, fs::File, io::Error as IoError,
-    num::ParseIntError, str::FromStr, sync::Arc, time::Duration,
+    collections::HashSet,
+    env::ArgsOs,
+    fmt::Display,
+    fs::File,
+    io::Error as IoError,
+    net::{AddrParseError, IpAddr, Ipv4Addr, SocketAddr},
+    num::ParseIntError,
+    str::FromStr,
+    sync::Arc,
+    time::Duration,
 };
 use thiserror::Error;
 
 pub struct Config {
     pub server_config: ServerConfig,
-    pub port: u16,
+    pub listen_addr: SocketAddr,
     pub token: HashSet<[u8; 32]>,
     pub authentication_timeout: Duration,
     pub max_udp_relay_packet_size: usize,
@@ -68,7 +76,7 @@ impl Config {
             config
         };
 
-        let port = raw.port.unwrap();
+        let listen_addr = SocketAddr::from((raw.ip, raw.port.unwrap()));
 
         let token = raw
             .token
@@ -82,7 +90,7 @@ impl Config {
 
         Ok(Self {
             server_config,
-            port,
+            listen_addr,
             token,
             authentication_timeout,
             max_udp_relay_packet_size,
@@ -99,6 +107,9 @@ struct RawConfig {
     certificate: Option<String>,
     private_key: Option<String>,
 
+    #[serde(default = "default::ip")]
+    ip: IpAddr,
+
     #[serde(
         default = "default::congestion_controller",
         deserialize_with = "deserialize_from_str"
@@ -128,6 +139,7 @@ impl Default for RawConfig {
             token: Vec::new(),
             certificate: None,
             private_key: None,
+            ip: default::ip(),
             congestion_controller: default::congestion_controller(),
             max_idle_time: default::max_idle_time(),
             authentication_timeout: default::authentication_timeout(),
@@ -172,6 +184,13 @@ impl RawConfig {
             "PRIVATE_KEY",
         );
 
+        opts.optopt(
+            "",
+            "ip",
+            "Set the server listening IP. Default: 0.0.0.0",
+            "IP",
+        );
+
         opts.optopt(
             "",
             "congestion-controller",
@@ -276,6 +295,10 @@ impl RawConfig {
             }
         };
 
+        if let Some(ip) = matches.opt_str("ip") {
+            raw.ip = ip.parse()?;
+        };
+
         if let Some(cgstn_ctrl) = matches.opt_str("congestion-controller") {
             raw.congestion_controller = cgstn_ctrl.parse()?;
         };
@@ -347,6 +370,10 @@ where
 mod default {
     use super::*;
 
+    pub(super) fn ip() -> IpAddr {
+        IpAddr::V4(Ipv4Addr::UNSPECIFIED)
+    }
+
     pub(super) const fn congestion_controller() -> CongestionController {
         CongestionController::Cubic
     }
@@ -390,6 +417,8 @@ pub enum ConfigError {
     MissingOption(&'static str),
     #[error(transparent)]
     ParseInt(#[from] ParseIntError),
+    #[error(transparent)]
+    ParseAddr(#[from] AddrParseError),
     #[error("Invalid congestion controller")]
     InvalidCongestionController,
     #[error(transparent)]

server/src/main.rs

@@ -34,7 +34,7 @@ async fn main() {
 
     let server = match Server::init(
         config.server_config,
-        config.port,
+        config.listen_addr,
         config.token,
         config.authentication_timeout,
         config.max_udp_relay_packet_size,

server/src/server.rs

@@ -4,15 +4,15 @@ use quinn::{Endpoint, EndpointConfig, Incoming, ServerConfig};
 use socket2::{Domain, Protocol, SockAddr, Socket, Type};
 use std::{
     collections::HashSet,
-    io::Error as IoError,
-    net::{Ipv6Addr, SocketAddr, UdpSocket},
+    io::Result,
+    net::{SocketAddr, UdpSocket},
     sync::Arc,
     time::Duration,
 };
 
 pub struct Server {
     incoming: Incoming,
-    port: u16,
+    listen_addr: SocketAddr,
     token: Arc<HashSet<[u8; 32]>>,
     authentication_timeout: Duration,
     max_pkt_size: usize,
@@ -21,24 +21,26 @@ pub struct Server {
 impl Server {
     pub fn init(
         config: ServerConfig,
-        port: u16,
+        listen_addr: SocketAddr,
         token: HashSet<[u8; 32]>,
         auth_timeout: Duration,
         max_pkt_size: usize,
-    ) -> Result<Self, IoError> {
+    ) -> Result<Self> {
+        let socket = match listen_addr {
+            SocketAddr::V4(_) => UdpSocket::bind(listen_addr)?,
+            SocketAddr::V6(_) => {
                 let socket = Socket::new(Domain::IPV6, Type::DGRAM, Some(Protocol::UDP))?;
                 socket.set_only_v6(false)?;
-        socket.bind(&SockAddr::from(SocketAddr::from((
-            Ipv6Addr::UNSPECIFIED,
-            port,
-        ))))?;
-        let socket = UdpSocket::from(socket);
+                socket.bind(&SockAddr::from(listen_addr))?;
+                UdpSocket::from(socket)
+            }
+        };
 
         let (_, incoming) = Endpoint::new(EndpointConfig::default(), Some(config), socket)?;
 
         Ok(Self {
             incoming,
-            port,
+            listen_addr,
             token: Arc::new(token),
             authentication_timeout: auth_timeout,
             max_pkt_size,
@@ -46,7 +48,7 @@ impl Server {
     }
 
     pub async fn run(mut self) {
-        log::info!("Server started. Listening port: {}", self.port);
+        log::info!("Server started. Listening: {}", self.listen_addr);
 
         while let Some(conn) = self.incoming.next().await {
             let token = self.token.clone();