Add config file

Cargo.lock

@@ -93,7 +93,9 @@ dependencies = [
  "getopts",
  "log",
  "once_cell",
+ "serde",
  "thiserror",
+ "toml",
 ]
 
 [[package]]
@@ -173,6 +175,26 @@ dependencies = [
  "proc-macro2",
 ]
 
+[[package]]
+name = "serde"
+version = "1.0.188"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "cf9e0fcba69a370eed61bcf2b728575f726b50b55cba78064753d708ddc7549e"
+dependencies = [
+ "serde_derive",
+]
+
+[[package]]
+name = "serde_derive"
+version = "1.0.188"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "4eca7ac642d82aa35b60049a6eccb4be6be75e599bd2e9adb5f875a737654af2"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
 [[package]]
 name = "syn"
 version = "2.0.37"
@@ -204,6 +226,15 @@ dependencies = [
  "syn",
 ]
 
+[[package]]
+name = "toml"
+version = "0.5.11"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f4f7f0dd8d50a853a531c426359045b1998f04219d88799810762cd4ad314234"
+dependencies = [
+ "serde",
+]
+
 [[package]]
 name = "unicode-ident"
 version = "1.0.12"

Cargo.toml

@@ -16,6 +16,8 @@ getopts = "0.2.21"
 log = "<0.4.19"
 bitflags = "2.4"
 fastrand = "2.0.1"
+serde = { version = "1.0.188", features = ["derive"] }
+toml = "0.5.11"
 
 [dependencies.chrono]
 version = "<0.4.27"

config/main.toml

@@ -0,0 +1,15 @@
+# Default config file
+
+[log]
+# Possible values: 0-5, off, error, warn, info, debug, trace
+level = "warn"
+
+[server]
+ip = "0.0.0.0"
+port = 27010
+
+[server.timeout]
+# Time in seconds while challenge is valid
+challenge = 300
+# Time in seconds while server is valid
+server = 300

src/cli.rs

@@ -1,19 +1,19 @@
 // SPDX-License-Identifier: GPL-3.0-only
 // SPDX-FileCopyrightText: 2023 Denis Drakhnia <numas13@gmail.com>
 
-use std::net::{IpAddr, Ipv4Addr, SocketAddr};
+use std::net::IpAddr;
 use std::process;
 
 use getopts::Options;
 use log::LevelFilter;
 use thiserror::Error;
 
+use crate::config;
+
 const BIN_NAME: &str = env!("CARGO_BIN_NAME");
 const PKG_NAME: &str = env!("CARGO_PKG_NAME");
 const PKG_VERSION: &str = env!("CARGO_PKG_VERSION");
 
-const DEFAULT_MASTER_SERVER_PORT: u16 = 27010;
-
 #[derive(Error, Debug)]
 pub enum Error {
     #[error("Invalid ip address \"{0}\"")]
@@ -24,22 +24,12 @@ pub enum Error {
     Options(#[from] getopts::Fail),
 }
 
-#[derive(Debug)]
+#[derive(Debug, Default)]
 pub struct Cli {
-    pub log_level: LevelFilter,
-    pub listen: SocketAddr,
-}
-
-impl Default for Cli {
-    fn default() -> Self {
-        Self {
-            log_level: LevelFilter::Warn,
-            listen: SocketAddr::new(
-                IpAddr::from(Ipv4Addr::new(0, 0, 0, 0)),
-                DEFAULT_MASTER_SERVER_PORT,
-            ),
-        }
-    }
+    pub log_level: Option<LevelFilter>,
+    pub listen_ip: Option<IpAddr>,
+    pub listen_port: Option<u16>,
+    pub config_path: Box<str>,
 }
 
 fn print_usage(opts: Options) {
@@ -52,7 +42,10 @@ fn print_version() {
 }
 
 pub fn parse() -> Result<Cli, Error> {
-    let mut cli = Cli::default();
+    let mut cli = Cli {
+        config_path: config::DEFAULT_CONFIG_PATH.to_string().into_boxed_str(),
+        ..Cli::default()
+    };
 
     let args: Vec<_> = std::env::args().collect();
     let mut opts = Options::new();
@@ -61,10 +54,15 @@ pub fn parse() -> Result<Cli, Error> {
     let log_help =
         "logging level [default: warn(2)]\nLEVEL: 0-5, off, error, warn, info, debug, trace";
     opts.optopt("l", "log", log_help, "LEVEL");
-    let ip_help = format!("listen ip [default: {}]", cli.listen.ip());
+    let ip_help = format!("listen ip [default: {}]", config::DEFAULT_MASTER_SERVER_IP);
     opts.optopt("i", "ip", &ip_help, "IP");
-    let port_help = format!("listen port [default: {}]", cli.listen.port());
+    let port_help = format!(
+        "listen port [default: {}]",
+        config::DEFAULT_MASTER_SERVER_PORT
+    );
     opts.optopt("p", "port", &port_help, "PORT");
+    let config_help = format!("config path [default: {}]", cli.config_path);
+    opts.optopt("c", "config", &config_help, "PATH");
 
     let matches = opts.parse(&args[1..])?;
 
@@ -79,38 +77,25 @@ pub fn parse() -> Result<Cli, Error> {
     }
 
     if let Some(value) = matches.opt_str("log") {
-        use LevelFilter as E;
-
-        cli.log_level = match value.as_str() {
-            _ if "off".starts_with(&value) => E::Off,
-            _ if "error".starts_with(&value) => E::Error,
-            _ if "warn".starts_with(&value) => E::Warn,
-            _ if "info".starts_with(&value) => E::Info,
-            _ if "debug".starts_with(&value) => E::Debug,
-            _ if "trace".starts_with(&value) => E::Trace,
-            _ => match value.parse::<u8>() {
-                Ok(0) => E::Off,
-                Ok(1) => E::Error,
-                Ok(2) => E::Warn,
-                Ok(3) => E::Info,
-                Ok(4) => E::Debug,
-                Ok(5) => E::Trace,
-                _ => {
-                    eprintln!("Invalid value for log option: \"{}\"", value);
-                    process::exit(1);
-                }
-            },
-        };
+        match config::parse_log_level(value.as_ref()) {
+            Some(level) => cli.log_level = Some(level),
+            None => {
+                eprintln!("Invalid value for log option: \"{}\"", value);
+                process::exit(1);
+            }
+        }
     }
 
     if let Some(s) = matches.opt_str("ip") {
-        cli.listen
-            .set_ip(s.parse().map_err(|_| Error::InvalidIp(s))?);
+        cli.listen_ip = Some(s.parse().map_err(|_| Error::InvalidIp(s))?);
     }
 
     if let Some(s) = matches.opt_str("port") {
-        cli.listen
-            .set_port(s.parse().map_err(|_| Error::InvalidPort(s))?);
+        cli.listen_port = Some(s.parse().map_err(|_| Error::InvalidPort(s))?);
+    }
+
+    if let Some(s) = matches.opt_str("config") {
+        cli.config_path = s.into_boxed_str();
     }
 
     Ok(cli)

src/config.rs

@@ -0,0 +1,142 @@
+// 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, Ipv4Addr};
+use std::path::Path;
+
+use log::LevelFilter;
+use serde::{de::Error as _, Deserialize, Deserializer};
+use thiserror::Error;
+
+pub const DEFAULT_CONFIG_PATH: &str = "config/main.toml";
+
+pub const DEFAULT_MASTER_SERVER_IP: IpAddr = IpAddr::V4(Ipv4Addr::new(0, 0, 0, 0));
+pub const DEFAULT_MASTER_SERVER_PORT: u16 = 27010;
+pub const DEFAULT_TIMEOUT: u32 = 300;
+
+#[derive(Debug, Error)]
+pub enum Error {
+    #[error(transparent)]
+    Toml(#[from] toml::de::Error),
+    #[error(transparent)]
+    Io(#[from] io::Error),
+}
+
+#[derive(Deserialize, Debug)]
+#[serde(deny_unknown_fields)]
+pub struct Config {
+    #[serde(default)]
+    pub log: LogConfig,
+    #[serde(default)]
+    pub server: ServerConfig,
+}
+
+#[derive(Deserialize, Debug)]
+#[serde(deny_unknown_fields)]
+pub struct LogConfig {
+    #[serde(default = "default_log_level")]
+    #[serde(deserialize_with = "deserialize_log_level")]
+    pub level: LevelFilter,
+}
+
+impl Default for LogConfig {
+    fn default() -> Self {
+        Self {
+            level: default_log_level(),
+        }
+    }
+}
+
+#[derive(Deserialize, Debug)]
+#[serde(deny_unknown_fields)]
+pub struct ServerConfig {
+    #[serde(default = "default_server_ip")]
+    pub ip: IpAddr,
+    #[serde(default = "default_server_port")]
+    pub port: u16,
+    #[serde(default)]
+    pub timeout: TimeoutConfig,
+}
+
+impl Default for ServerConfig {
+    fn default() -> Self {
+        Self {
+            ip: default_server_ip(),
+            port: default_server_port(),
+            timeout: Default::default(),
+        }
+    }
+}
+
+#[derive(Deserialize, Debug)]
+#[serde(deny_unknown_fields)]
+pub struct TimeoutConfig {
+    #[serde(default = "default_timeout")]
+    pub challenge: u32,
+    #[serde(default = "default_timeout")]
+    pub server: u32,
+}
+
+impl Default for TimeoutConfig {
+    fn default() -> Self {
+        Self {
+            challenge: default_timeout(),
+            server: default_timeout(),
+        }
+    }
+}
+
+fn default_log_level() -> LevelFilter {
+    LevelFilter::Warn
+}
+
+fn default_server_ip() -> IpAddr {
+    DEFAULT_MASTER_SERVER_IP
+}
+
+fn default_server_port() -> u16 {
+    DEFAULT_MASTER_SERVER_PORT
+}
+
+fn default_timeout() -> u32 {
+    DEFAULT_TIMEOUT
+}
+
+fn deserialize_log_level<'de, D>(de: D) -> Result<LevelFilter, D::Error>
+where
+    D: Deserializer<'de>,
+{
+    let s = <&str>::deserialize(de)?;
+    parse_log_level(s)
+        .ok_or_else(|| D::Error::custom(format!("Invalid value for log option: \"{}\"", s)))
+}
+
+pub fn parse_log_level(s: &str) -> Option<LevelFilter> {
+    use LevelFilter as E;
+
+    let level_filter = match s {
+        _ if "off".starts_with(s) => E::Off,
+        _ if "error".starts_with(s) => E::Error,
+        _ if "warn".starts_with(s) => E::Warn,
+        _ if "info".starts_with(s) => E::Info,
+        _ if "debug".starts_with(s) => E::Debug,
+        _ if "trace".starts_with(s) => E::Trace,
+        _ => match s.parse::<u8>() {
+            Ok(0) => E::Off,
+            Ok(1) => E::Error,
+            Ok(2) => E::Warn,
+            Ok(3) => E::Info,
+            Ok(4) => E::Debug,
+            Ok(5) => E::Trace,
+            _ => return None,
+        },
+    };
+    Some(level_filter)
+}
+
+pub fn load<P: AsRef<Path>>(path: P) -> Result<Config, Error> {
+    let data = fs::read(path)?;
+    Ok(toml::de::from_slice(&data)?)
+}

src/main.rs

@@ -3,6 +3,7 @@
 
 mod cli;
 mod client;
+mod config;
 mod filter;
 mod logger;
 mod master_server;
@@ -18,9 +19,26 @@ fn main() {
         std::process::exit(1);
     });
 
-    logger::init(cli.log_level);
+    let mut cfg = config::load(cli.config_path.as_ref()).unwrap_or_else(|e| {
+        eprintln!("Failed to load config \"{}\": {}", cli.config_path, e);
+        std::process::exit(1);
+    });
+
+    if let Some(level) = cli.log_level {
+        cfg.log.level = level;
+    }
+
+    if let Some(ip) = cli.listen_ip {
+        cfg.server.ip = ip;
+    }
+
+    if let Some(port) = cli.listen_port {
+        cfg.server.port = port;
+    }
+
+    logger::init(cfg.log.level);
 
-    if let Err(e) = master_server::run(cli.listen) {
+    if let Err(e) = master_server::run(cfg) {
         error!("{}", e);
         std::process::exit(1);
     }

src/master_server.rs

@@ -13,6 +13,7 @@ use log::{error, info, trace, warn};
 use thiserror::Error;
 
 use crate::client::Packet;
+use crate::config::{self, Config};
 use crate::filter::Filter;
 use crate::server::Server;
 use crate::server_info::Region;
@@ -23,13 +24,9 @@ const MAX_PACKET_SIZE: usize = 512;
 const CHALLENGE_RESPONSE_HEADER: &[u8] = b"\xff\xff\xff\xffs\n";
 const SERVER_LIST_HEADER: &[u8] = b"\xff\xff\xff\xfff\n";
 
-/// Time in seconds while server is valid.
-const SERVER_TIMEOUT: u32 = 300;
 /// How many cleanup calls should be skipped before removing outdated servers.
 const SERVER_CLEANUP_MAX: usize = 100;
 
-/// Time in seconds while challenge is valid.
-const CHALLENGE_TIMEOUT: u32 = 300;
 /// How many cleanup calls should be skipped before removing outdated challenges.
 const CHALLENGE_CLEANUP_MAX: usize = 100;
 
@@ -83,10 +80,12 @@ struct MasterServer {
     rng: Rng,
     cleanup_challenges: usize,
     cleanup_servers: usize,
+    timeout: config::TimeoutConfig,
 }
 
 impl MasterServer {
-    fn new(addr: SocketAddr) -> Result<Self, Error> {
+    fn new(cfg: Config) -> Result<Self, Error> {
+        let addr = SocketAddr::new(cfg.server.ip, cfg.server.port);
         info!("Listen address: {}", addr);
         let sock = UdpSocket::bind(addr).map_err(Error::BindSocket)?;
 
@@ -98,6 +97,7 @@ impl MasterServer {
             rng: Rng::new(),
             cleanup_challenges: 0,
             cleanup_servers: 0,
+            timeout: cfg.server.timeout,
         })
     }
 
@@ -142,7 +142,7 @@ impl MasterServer {
                         return Ok(());
                     }
                 };
-                if !entry.is_valid(self.now(), CHALLENGE_TIMEOUT) {
+                if !entry.is_valid(self.now(), self.timeout.challenge) {
                     return Ok(());
                 }
                 if challenge != entry.value {
@@ -189,7 +189,7 @@ impl MasterServer {
         let now = self.now();
         let old = self.challenges.len();
         self.challenges
-            .retain(|_, v| v.is_valid(now, CHALLENGE_TIMEOUT));
+            .retain(|_, v| v.is_valid(now, self.timeout.challenge));
         let new = self.challenges.len();
         if old != new {
             trace!("Removed {} outdated challenges", old - new);
@@ -198,8 +198,7 @@ impl MasterServer {
     }
 
     fn add_server(&mut self, addr: SocketAddrV4, server: Server) {
-        let entry = Entry::new(self.now(), server);
-        match self.servers.insert(addr, entry) {
+        match self.servers.insert(addr, Entry::new(self.now(), server)) {
             Some(_) => trace!("{}: Updated GameServer", addr),
             None => trace!("{}: New GameServer", addr),
         }
@@ -212,7 +211,8 @@ impl MasterServer {
         }
         let now = self.now();
         let old = self.servers.len();
-        self.servers.retain(|_, v| v.is_valid(now, SERVER_TIMEOUT));
+        self.servers
+            .retain(|_, v| v.is_valid(now, self.timeout.server));
         let new = self.servers.len();
         if old != new {
             trace!("Removed {} outdated servers", old - new);
@@ -250,7 +250,7 @@ impl MasterServer {
         let mut iter = self
             .servers
             .iter()
-            .filter(|i| i.1.is_valid(now, SERVER_TIMEOUT))
+            .filter(|i| i.1.is_valid(now, self.timeout.server))
             .filter(|i| i.1.matches(*i.0, region, filter))
             .map(|i| i.0);
 
@@ -287,6 +287,6 @@ impl MasterServer {
     }
 }
 
-pub fn run(addr: SocketAddr) -> Result<(), Error> {
-    MasterServer::new(addr)?.run()
+pub fn run(cfg: Config) -> Result<(), Error> {
+    MasterServer::new(cfg)?.run()
 }