refactor, use one binary for both ip versions

master/src/config.rs

@@ -1,22 +1,18 @@
 // SPDX-License-Identifier: GPL-3.0-only
 // SPDX-FileCopyrightText: 2023 Denis Drakhnia <numas13@gmail.com>
 
-use std::fs;
-use std::io;
-use std::net::IpAddr;
-use std::path::Path;
+use std::{
+    fs, io,
+    net::{IpAddr, Ipv4Addr},
+    path::Path,
+};
 
 use log::LevelFilter;
 use serde::{de::Error as _, Deserialize, Deserializer};
 use thiserror::Error;
-use xash3d_protocol::admin;
-use xash3d_protocol::filter::Version;
-
-#[cfg(not(feature = "ipv6"))]
-pub const DEFAULT_MASTER_SERVER_IP: IpAddr = IpAddr::V4(std::net::Ipv4Addr::UNSPECIFIED);
+use xash3d_protocol::{admin, filter::Version};
 
-#[cfg(feature = "ipv6")]
-pub const DEFAULT_MASTER_SERVER_IP: IpAddr = IpAddr::V6(std::net::Ipv6Addr::UNSPECIFIED);
+pub const DEFAULT_MASTER_SERVER_IP: IpAddr = IpAddr::V4(Ipv4Addr::UNSPECIFIED);
 
 pub const DEFAULT_MASTER_SERVER_PORT: u16 = 27010;
 pub const DEFAULT_CHALLENGE_TIMEOUT: u32 = 10;

master/src/main.rs

@@ -23,7 +23,7 @@ use signal_hook::{consts::signal::*, flag as signal_flag};
 
 use crate::cli::Cli;
 use crate::config::Config;
-use crate::master_server::{Error, MasterServer};
+use crate::master_server::{Error, Master};
 
 fn load_config(cli: &Cli) -> Result<Config, config::Error> {
     let mut cfg = match cli.config_path {
@@ -68,7 +68,7 @@ fn run() -> Result<(), Error> {
         process::exit(1);
     });
 
-    let mut master = MasterServer::new(cfg)?;
+    let mut master = Master::new(cfg)?;
     let sig_flag = Arc::new(AtomicBool::new(false));
     // XXX: Windows does not support SIGUSR1.
     #[cfg(not(windows))]

master/src/master_server.rs

@@ -2,9 +2,12 @@
 // SPDX-FileCopyrightText: 2023 Denis Drakhnia <numas13@gmail.com>
 
 use std::{
+    cmp::Eq,
     collections::hash_map,
+    fmt::Display,
+    hash::Hash,
     io,
-    net::{SocketAddr, ToSocketAddrs, UdpSocket},
+    net::{Ipv4Addr, Ipv6Addr, SocketAddr, SocketAddrV4, SocketAddrV6, ToSocketAddrs, UdpSocket},
     ops::Deref,
     sync::atomic::{AtomicBool, Ordering},
     time::{Duration, Instant},
@@ -31,60 +34,54 @@ use crate::{
     stats::Stats,
 };
 
-#[cfg(not(feature = "ipv6"))]
-mod protocol {
-    use std::net::SocketAddr;
+pub trait AddrExt: Sized + Eq + Hash + Display + Copy + ToSocketAddrs + ServerAddress {
+    type Ip;
 
-    pub type Addr = std::net::SocketAddrV4;
-    pub type Ip = std::net::Ipv4Addr;
+    fn extract(addr: SocketAddr) -> Result<Self, SocketAddr>;
+    fn ip(&self) -> &Self::Ip;
+    fn wrap(self) -> SocketAddr;
+}
+
+impl AddrExt for SocketAddrV4 {
+    type Ip = Ipv4Addr;
 
-    pub fn extract_addr(addr: SocketAddr) -> Option<Addr> {
-        if let SocketAddr::V4(a) = addr {
-            Some(a)
+    fn extract(addr: SocketAddr) -> Result<Self, SocketAddr> {
+        if let SocketAddr::V4(addr) = addr {
+            Ok(addr)
         } else {
-            None
+            Err(addr)
         }
     }
 
-    #[inline(always)]
-    pub fn wrap_addr(addr: Addr) -> SocketAddr {
-        SocketAddr::V4(addr)
+    fn ip(&self) -> &Self::Ip {
+        SocketAddrV4::ip(self)
     }
 
-    #[inline(always)]
-    pub fn check_addr(addr: &SocketAddr) -> bool {
-        addr.is_ipv4()
+    fn wrap(self) -> SocketAddr {
+        SocketAddr::V4(self)
     }
 }
 
-#[cfg(feature = "ipv6")]
-mod protocol {
-    use std::net::SocketAddr;
-
-    pub type Addr = std::net::SocketAddrV6;
-    pub type Ip = std::net::Ipv6Addr;
+impl AddrExt for SocketAddrV6 {
+    type Ip = Ipv6Addr;
 
-    pub fn extract_addr(addr: SocketAddr) -> Option<Addr> {
-        if let SocketAddr::V6(a) = addr {
-            Some(a)
+    fn extract(addr: SocketAddr) -> Result<Self, SocketAddr> {
+        if let SocketAddr::V6(addr) = addr {
+            Ok(addr)
         } else {
-            None
+            Err(addr)
         }
     }
 
-    #[inline(always)]
-    pub fn wrap_addr(addr: Addr) -> SocketAddr {
-        SocketAddr::V6(addr)
+    fn ip(&self) -> &Self::Ip {
+        SocketAddrV6::ip(self)
     }
 
-    #[inline(always)]
-    pub fn check_addr(addr: &SocketAddr) -> bool {
-        addr.is_ipv6()
+    fn wrap(self) -> SocketAddr {
+        SocketAddr::V6(self)
     }
 }
 
-use self::protocol::*;
-
 /// The maximum size of UDP packets.
 const MAX_PACKET_SIZE: usize = 512;
 
@@ -104,8 +101,6 @@ const ADMIN_LIMIT_CLEANUP_MAX: usize = 100;
 pub enum Error {
     #[error("Failed to bind server socket: {0}")]
     BindSocket(io::Error),
-    #[error("IP version is not supported")]
-    Unsupported,
     #[error(transparent)]
     Protocol(#[from] ProtocolError),
     #[error(transparent)]
@@ -136,8 +131,8 @@ impl<T> Entry<T> {
 }
 
 impl Entry<ServerInfo> {
-    fn matches(&self, addr: Addr, region: Region, filter: &Filter) -> bool {
-        self.region == region && filter.matches(wrap_addr(addr), &self.value)
+    fn matches<Addr: AddrExt>(&self, addr: Addr, region: Region, filter: &Filter) -> bool {
+        self.region == region && filter.matches(addr.wrap(), &self.value)
     }
 }
 
@@ -170,7 +165,7 @@ impl Counter {
     }
 }
 
-pub struct MasterServer {
+pub struct MasterServer<Addr: AddrExt> {
     sock: UdpSocket,
     challenges: HashMap<Addr, Entry<u32>>,
     challenges_counter: Counter,
@@ -187,15 +182,15 @@ pub struct MasterServer {
     update_map: Box<str>,
     update_addr: SocketAddr,
 
-    admin_challenges: HashMap<Ip, Entry<(u32, u32)>>,
+    admin_challenges: HashMap<Addr::Ip, Entry<(u32, u32)>>,
     admin_challenges_counter: Counter,
     admin_list: Box<[config::AdminConfig]>,
     // rate limit if hash is invalid
-    admin_limit: HashMap<Ip, Entry<()>>,
+    admin_limit: HashMap<Addr::Ip, Entry<()>>,
     admin_limit_counter: Counter,
     hash: config::HashConfig,
 
-    blocklist: HashSet<Ip>,
+    blocklist: HashSet<Addr::Ip>,
 
     stats: Stats,
 
@@ -233,18 +228,52 @@ fn resolve_update_addr(cfg: &Config, local_addr: SocketAddr) -> SocketAddr {
     local_addr
 }
 
-impl MasterServer {
+pub enum Master {
+    V4(MasterServer<SocketAddrV4>),
+    V6(MasterServer<SocketAddrV6>),
+}
+
+impl Master {
     pub fn new(cfg: Config) -> Result<Self, Error> {
-        let addr = SocketAddr::new(cfg.server.ip, cfg.server.port);
-        if !check_addr(&addr) {
-            return Err(Error::Unsupported);
+        match SocketAddr::new(cfg.server.ip, cfg.server.port) {
+            SocketAddr::V4(addr) => MasterServer::new(cfg, addr).map(Self::V4),
+            SocketAddr::V6(addr) => MasterServer::new(cfg, addr).map(Self::V6),
+        }
+    }
+
+    pub fn update_config(&mut self, cfg: Config) -> Result<(), Error> {
+        let cfg = match self {
+            Self::V4(inner) => inner.update_config(cfg)?,
+            Self::V6(inner) => inner.update_config(cfg)?,
+        };
+        if let Some(cfg) = cfg {
+            info!("Server IP version changed, full restart");
+            *self = Self::new(cfg)?;
+        }
+        Ok(())
+    }
+
+    pub fn run(&mut self, sig_flag: &AtomicBool) -> Result<(), Error> {
+        match self {
+            Self::V4(inner) => inner.run(sig_flag),
+            Self::V6(inner) => inner.run(sig_flag),
         }
+    }
+}
+
+impl<Addr> MasterServer<Addr>
+where
+    Addr: AddrExt,
+    Addr::Ip: Eq + Hash + Display + Copy + std::str::FromStr,
+{
+    pub fn new(cfg: Config, addr: Addr) -> Result<Self, Error> {
         info!("Listen address: {}", addr);
+
         let sock = UdpSocket::bind(addr).map_err(Error::BindSocket)?;
         // make socket interruptable by singals
         sock.set_read_timeout(Some(Duration::from_secs(u32::MAX as u64)))?;
 
-        let update_addr = resolve_update_addr(&cfg, addr);
+        let update_addr = resolve_update_addr(&cfg, addr.wrap());
 
         Ok(Self {
             sock,
@@ -274,10 +303,16 @@ impl MasterServer {
         })
     }
 
-    pub fn update_config(&mut self, cfg: Config) -> Result<(), Error> {
-        let local_addr = self.sock.local_addr()?;
+    fn local_addr(&self) -> io::Result<SocketAddr> {
+        self.sock.local_addr()
+    }
+
+    pub fn update_config(&mut self, cfg: Config) -> Result<Option<Config>, Error> {
+        let local_addr = self.local_addr()?;
         let addr = SocketAddr::new(cfg.server.ip, cfg.server.port);
-        if local_addr != addr {
+        if local_addr.is_ipv4() != addr.is_ipv4() {
+            return Ok(Some(cfg));
+        } else if local_addr != addr {
             info!("Listen address: {}", addr);
             self.sock = UdpSocket::bind(addr).map_err(Error::BindSocket)?;
             // make socket interruptable by singals
@@ -295,7 +330,7 @@ impl MasterServer {
         self.hash = cfg.hash;
         self.stats.update_config(cfg.stat);
 
-        Ok(())
+        Ok(None)
     }
 
     pub fn run(&mut self, sig_flag: &AtomicBool) -> Result<(), Error> {
@@ -310,14 +345,9 @@ impl MasterServer {
                 },
             };
 
-            let from = match extract_addr(from) {
-                Some(from) => from,
-                None => {
-                    if from.is_ipv6() {
-                        debug!("{}: IPv6 is not implemented", from);
-                    }
-                    continue;
-                }
+            let from = match Addr::extract(from) {
+                Ok(from) => from,
+                Err(_) => continue,
             };
 
             let src = &buf[..n];
@@ -596,7 +626,7 @@ impl MasterServer {
         }
     }
 
-    fn count_servers(&self, ip: &Ip) -> u16 {
+    fn count_servers(&self, ip: &Addr::Ip) -> u16 {
         self.servers.keys().filter(|i| i.ip() == ip).count() as u16
     }
 
@@ -645,7 +675,7 @@ impl MasterServer {
 
     fn send_client_to_nat_servers(&self, to: Addr, servers: &[Addr]) -> Result<(), Error> {
         let mut buf = [0; 64];
-        let n = master::ClientAnnounce::new(wrap_addr(to)).encode(&mut buf)?;
+        let n = master::ClientAnnounce::new(to.wrap()).encode(&mut buf)?;
         let buf = &buf[..n];
         for i in servers {
             self.sock.send_to(buf, i)?;
@@ -654,15 +684,20 @@ impl MasterServer {
     }
 
     #[inline]
-    fn is_blocked(&self, ip: &Ip) -> bool {
+    fn is_blocked(&self, ip: &Addr::Ip) -> bool {
         self.blocklist.contains(ip)
     }
 
     fn admin_command(&mut self, cmd: &str) {
         let args: Vec<_> = cmd.split(' ').collect();
 
-        fn helper<F: FnMut(&str, Ip)>(args: &[&str], mut op: F) {
-            let iter = args.iter().map(|i| (i, i.parse::<Ip>()));
+        fn helper<Addr, F>(args: &[&str], mut op: F)
+        where
+            Addr: AddrExt,
+            Addr::Ip: std::str::FromStr,
+            F: FnMut(&str, Addr::Ip),
+        {
+            let iter = args.iter().map(|i| (i, i.parse::<Addr::Ip>()));
             for (i, ip) in iter {
                 match ip {
                     Ok(ip) => op(i, ip),
@@ -673,14 +708,14 @@ impl MasterServer {
 
         match args[0] {
             "ban" => {
-                helper(&args[1..], |_, ip| {
+                helper::<Addr, _>(&args[1..], |_, ip| {
                     if self.blocklist.insert(ip) {
                         info!("ban ip: {}", ip);
                     }
                 });
             }
             "unban" => {
-                helper(&args[1..], |_, ip| {
+                helper::<Addr, _>(&args[1..], |_, ip| {
                     if self.blocklist.remove(&ip) {
                         info!("unban ip: {}", ip);
                     }