.drone.jsonnet

@@ -1,5 +1,5 @@
 local executableName = 'fourth';
-local build_image = 'img.kie.rs/jjkiers/rust-cross:rust1.70-zig';
+local build_image = 'img.kie.rs/jjkiers/rust-cross:rust1.71.1-zig';
 
 local archs = [
   { target: 'aarch64-unknown-linux-musl', short: 'arm64-musl' },

src/config.rs

@@ -173,6 +173,10 @@ fn load_config(path: &str) -> Result<ParsedConfig, ConfigError> {
                 name: name.to_string(),
                 addr: format!("{}:{}", upstream_host, upsteam_port),
                 protocol: upstream_url.scheme().to_string(),
+                addresses: Addr(Mutex::new(UpstreamAddress::new(format!(
+                    "{}:{}",
+                    upstream_host, upsteam_port
+                )))),
                 ..Default::default()
             }),
         );

src/main.rs

@@ -7,10 +7,10 @@ use crate::servers::Server;
 
 use log::{debug, error};
 use std::env;
+use std::path::Path;
 
 fn main() {
-    let config_path =
-        env::var("FOURTH_CONFIG").unwrap_or_else(|_| "/etc/fourth/config.yaml".to_string());
+    let config_path = find_config();
 
     let config = match Config::new(&config_path) {
         Ok(config) => config,
@@ -27,3 +27,18 @@ fn main() {
     let _ = server.run();
     error!("Server ended with errors");
 }
+
+fn find_config() -> String {
+    let config_path =
+        env::var("FOURTH_CONFIG").unwrap_or_else(|_| "/etc/fourth/config.yaml".to_string());
+
+    if Path::new(&config_path).exists() {
+        return config_path;
+    }
+
+    if Path::new("config.yaml").exists() {
+        return String::from("config.yaml");
+    }
+
+    String::from("")
+}

src/servers/mod.rs

@@ -13,7 +13,6 @@ use protocol::tcp;
 #[derive(Debug)]
 pub(crate) struct Server {
     pub proxies: Vec<Arc<Proxy>>,
-    pub config: ParsedConfig,
 }
 
 #[derive(Debug, Clone)]
@@ -31,7 +30,6 @@ impl Server {
     pub fn new(config: ParsedConfig) -> Self {
         let mut new_server = Server {
             proxies: Vec::new(),
-            config: config.clone(),
         };
 
         for (name, proxy) in config.servers.iter() {

src/servers/protocol/tcp.rs

@@ -72,21 +72,17 @@ async fn accept(inbound: TcpStream, proxy: Arc<Proxy>) -> Result<(), Box<dyn std
                 "No upstream named {:?} on server {:?}",
                 proxy.default_action, proxy.name
             );
-            return process(
-                inbound,
-                proxy.upstream.get(&proxy.default_action).unwrap().clone(),
-            )
-            .await;
+            return process(inbound, proxy.upstream.get(&proxy.default_action).unwrap()).await;
             // ToDo: Remove unwrap and check default option
         }
     };
 
-    return process(inbound, upstream.clone()).await;
+    return process(inbound, &upstream).await;
 }
 
 async fn process(
     mut inbound: TcpStream,
-    upstream: Upstream,
+    upstream: &Upstream,
 ) -> Result<(), Box<dyn std::error::Error>> {
     match upstream {
         Upstream::Ban => {

src/servers/upstream_address.rs

@@ -19,6 +19,13 @@ impl Display for UpstreamAddress {
 }
 
 impl UpstreamAddress {
+    pub fn new(address: String) -> Self {
+        UpstreamAddress {
+            address,
+            ..Default::default()
+        }
+    }
+
     pub fn is_valid(&self) -> bool {
         if let Some(resolved) = self.resolved_time {
             if let Some(ttl) = self.ttl {
@@ -44,20 +51,24 @@ impl UpstreamAddress {
     pub async fn resolve(&mut self, mode: ResolutionMode) -> Result<Vec<SocketAddr>> {
         if self.is_resolved() && self.is_valid() {
             debug!(
-                "Already got address {:?}, still valid for {}",
+                "Already got address {:?}, still valid for {:.3}s",
                 &self.resolved_addresses,
-                self.time_remaining()
+                self.time_remaining().as_seconds_f64()
             );
             return Ok(self.resolved_addresses.clone());
         }
 
-        debug!("Resolving addresses for {}", &self.address);
+        debug!(
+            "Resolving addresses for {} with mode {:?}",
+            &self.address, &mode
+        );
 
         let lookup_result = tokio::net::lookup_host(&self.address).await;
 
-        let resolved_addresses = match lookup_result {
-            Ok(resolved_addresses) => resolved_addresses,
+        let resolved_addresses: Vec<SocketAddr> = match lookup_result {
+            Ok(resolved_addresses) => resolved_addresses.into_iter().collect(),
             Err(e) => {
+                debug!("Failed looking up {}: {}", &self.address, &e);
                 // Protect against DNS flooding. Cache the result for 1 second.
                 self.resolved_time = Some(Instant::now());
                 self.ttl = Some(Duration::seconds(3));
@@ -65,6 +76,8 @@ impl UpstreamAddress {
             }
         };
 
+        debug!("Resolved addresses: {:?}", &resolved_addresses);
+
         let addresses: Vec<SocketAddr> = match mode {
             ResolutionMode::Ipv4 => resolved_addresses
                 .into_iter()
@@ -76,10 +89,13 @@ impl UpstreamAddress {
                 .filter(|a| a.is_ipv6())
                 .collect(),
 
-            _ => resolved_addresses.collect(),
+            _ => resolved_addresses,
         };
 
-        debug!("Got addresses for {}: {:?}", &self.address, &addresses);
+        debug!(
+            "Got {} addresses for {}: {:?}",
+            &mode, &self.address, &addresses
+        );
         debug!(
             "Resolved at {}",
             OffsetDateTime::now_utc()
@@ -113,3 +129,13 @@ impl From<&str> for ResolutionMode {
         }
     }
 }
+
+impl Display for ResolutionMode {
+    fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
+        match self {
+            ResolutionMode::Ipv4 => write!(f, "IPv4Only"),
+            ResolutionMode::Ipv6 => write!(f, "IPv6Only"),
+            ResolutionMode::Ipv4AndIpv6 => write!(f, "IPv4 and IPv6"),
+        }
+    }
+}