add config for relay listen address

this will make it easier to run on Wireguard or LANs or whatever

crates/ptth_relay/src/config.rs

@@ -4,7 +4,9 @@
 use std::{
 	collections::HashMap,
 	convert::{TryFrom},
+	net::IpAddr,
 	path::Path,
+	str::FromStr,
 };
 
 use crate::{
@@ -90,6 +92,7 @@ pub mod file {
 		#[serde (flatten)]
 		pub iso: Isomorphic,
 		
+		pub address: Option <String>,
 		pub port: Option <u16>,
 		pub servers: Option <Vec <Server>>,
 		
@@ -102,16 +105,29 @@ pub mod file {
 
 /// Config fields as they are used at runtime
 
-#[derive (Default)]
 pub struct Config {
 	pub iso: file::Isomorphic,
 	
+	pub address: IpAddr,
 	pub port: Option <u16>,
 	pub servers: HashMap <String, file::Server>,
 	pub scraper_keys: HashMap <String, ScraperKey <Valid30Days>>,
 	pub news_url: Option <String>,
 }
 
+impl Default for Config {
+	fn default () -> Self {
+		Self {
+			iso: Default::default (),
+			address: IpAddr::from ([0, 0, 0, 0]),
+			port: None,
+			servers: Default::default (),
+			scraper_keys: Default::default (),
+			news_url: None,
+		}
+	}
+}
+
 impl TryFrom <file::Config> for Config {
 	type Error = ConfigError;
 	
@@ -131,6 +147,7 @@ impl TryFrom <file::Config> for Config {
 		
 		Ok (Self {
 			iso: f.iso,
+			address: parse_address (f.address.as_ref ().map (|s| &s[..]))?,
 			port: f.port,
 			servers,
 			scraper_keys,
@@ -139,6 +156,14 @@ impl TryFrom <file::Config> for Config {
 	}
 }
 
+fn parse_address (s: Option <&str>) -> Result <IpAddr, ConfigError> {
+	Ok (s
+		.map (|s| IpAddr::from_str (s))
+		.transpose ().map_err (|_| ConfigError::BadServerAddress)?
+		.unwrap_or (IpAddr::from ([0, 0, 0, 0]))
+	)
+}
+
 impl Config {
 	pub async fn from_file (path: &Path) -> Result <Self, ConfigError> {
 		let config_s = tokio::fs::read_to_string (path).await?;
@@ -147,3 +172,23 @@ impl Config {
 		Self::try_from (new_config)
 	}
 }
+
+#[cfg (test)]
+mod tests {
+	use super::*;
+	
+	#[test]
+	fn ip_address () {
+		for (input, expected) in vec! [
+			(None, Some (IpAddr::from ([0, 0, 0, 0]))),
+			(Some ("bogus"), None),
+			(Some ("0.0.0.0"), Some (IpAddr::from ([0, 0, 0, 0]))),
+			(Some ("0"), None),
+			(Some ("127.0.0.1"), Some (IpAddr::from ([127, 0, 0, 1]))),
+			(Some ("10.0.0.1"), Some (IpAddr::from ([10, 0, 0, 1]))),
+		].into_iter () {
+			let actual = parse_address (input).ok ();
+			assert_eq! (actual, expected);
+		}
+	}
+}

crates/ptth_relay/src/errors.rs

@@ -17,6 +17,9 @@ pub enum ConfigError {
 	#[error ("tripcode not 32 bytes after decoding")]
 	TripcodeBadLength,
 	
+	#[error ("Bad server address")]
+	BadServerAddress,
+	
 	#[error ("unknown config error")]
 	Unknown,
 }

crates/ptth_relay/src/lib.rs

@@ -683,16 +683,22 @@ pub async fn run_relay (
 		}
 	});
 	
-	let addr = SocketAddr::from ((
-		[0, 0, 0, 0],
-		state.config.read ().await.port.unwrap_or (4000),
-	));
+	let addr = {
+		let guard = state.config.read ().await;
+		
+		SocketAddr::from ((
+			guard.address,
+			guard.port.unwrap_or (4000),
+		))
+	};
 	
 	let server = Server::bind (&addr)
 	.serve (make_svc);
 	
 	state.audit_log.push (AuditEvent::new (AuditData::RelayStart)).await;
 	
+	trace! ("Serving relay on {:?}", addr);
+	
 	server.with_graceful_shutdown (async {
 		use ShuttingDownError::ShuttingDown;
 		

crates/ptth_relay/src/relay_state.rs

@@ -200,6 +200,11 @@ impl Builder {
 		Relay::try_from (self.config)
 	}
 	
+	pub fn address (mut self, addr: std::net::IpAddr) -> Self {
+		self.config.address = addr;
+		self
+	}
+	
 	pub fn enable_scraper_api (mut self, b: bool) -> Self {
 		self.config.iso.enable_scraper_api = b;
 		self