Update Rust crate serde to v1.0.214

Reviewed-on: #169

.drone.yml

@@ -0,0 +1,13 @@
+---
+kind: pipeline
+type: docker
+name: default
+
+steps:
+- name: cargo_check
+  image: rust
+  commands:
+  - rustup component add clippy
+  - cargo clippy -- -D warnings
+  - cargo test
+

.gitignore

@@ -1,2 +1,3 @@
 target
 .idea
+pki

Cargo.toml

@@ -1,7 +1,32 @@
-[workspace]
+[package]
+name = "tcp_over_http"
+version = "0.1.0"
+edition = "2021"
+description = "TCP-over-HTTP solution"
 
-members = [
-	"base",
-	"tcp_relay_server",
-	"tcp_relay_client"
-]
+[dependencies]
+clap = { version = "4.5.4", features = ["derive", "env"] }
+log = "0.4.21"
+env_logger = "0.11.3"
+actix = "0.13.3"
+actix-web = { version = "4.5.1", features = ["rustls-0_21"] }
+actix-web-actors = "4.3.0"
+actix-tls = "3.3.0"
+serde = { version = "1.0.200", features = ["derive"] }
+tokio = { version = "1.37.0", features = ["full"] }
+futures = "0.3.30"
+webpki = "0.22.4"
+x509-parser = "0.16.0"
+pem = "3.0.4"
+reqwest = { version = "0.12.4", features = ["json", "rustls-tls"], default-features = false }
+tokio-tungstenite = { version = "0.20.0", features = ["__rustls-tls", "rustls-tls-native-roots"] }
+urlencoding = "2.1.3"
+hyper-rustls = { version = "0.23.2", features = ["rustls-native-certs"] }
+bytes = "1.6.0"
+rustls-pemfile = "2.0.0"
+rustls = { version = "0.21.0", features = ["dangerous_configuration"] }
+rustls-native-certs = "0.6.3"
+
+[dev-dependencies]
+rand = "0.8.5"
+mktemp = "0.5.1"

README.MD

@@ -1,4 +1,6 @@
 # TCP over HTTP
+[![Build Status](https://drone.communiquons.org/api/badges/pierre/tcp-over-http/status.svg)](https://drone.communiquons.org/pierre/tcp-over-http)
+
 This project aims to provide an easy-to-setup TCP forwarding solution:
 
 ```
@@ -6,17 +8,28 @@ This project aims to provide an easy-to-setup TCP forwarding solution:
 |        |              | Client |                     | Server |              |        |
 | Client | -- TCP xx -- |        | -- HTTP 80 / 443 -- |        | -- TCP xx -- | Server |
 |        |              |  Relay |                     |  Relay |              |        |
-|--------|              |--------|                     |--------|              |--------|
+|--------|              |--------|                     |--------|              |--------|
 ```
 
 This project can be used especially to bypass firewalls that blocks traffics
-from ports others than the 80 / 443 duo.
+from ports others than the HTTP / HTTPS ports. The TCP traffic is encapsulated inside an
+HTTP WebSocket between the client and the server relays.
 
-This repository contains two binaries:
+## Authentication
+The client can authenticate against the server relays through two different means:
 
-* `tpc_relay_server`: The server relay
-* `tcp_relay_client`: The client relay
+* Using a token (the server relay can have several tokens at the same time)
+* Using a client TLS certificate. In this case, the server relay must act as a HTTPS server, and you must provide the
+  server the required certificates / key files in PEM format. It is also possible to provide the  server a CRL file.
 
-The clients relay authenticates itself to the server using a token.
+
+## Binary
+This repository contains a single binary which can be used as a server or a client, depending of command line arguments:
+
+* Server mode: Act as a server relay. In case of token authentication (NOT TLS authentication), it can be put behind a reverse proxy.
+* Client mode: Act as a client relay. It basically does three things:
+  * Fetch the list of forwared ports configuration from the server
+  * Listen to these port locally
+  * When a connection occurs on one of these ports, it forward the data exchanged by the socket to and from the server.
 
 A single server - client relay pair can relay multiple ports simultaneously from the same machine.

base/Cargo.toml

@@ -1,7 +0,0 @@
-[package]
-name = "base"
-version = "0.1.0"
-edition = "2021"
-
-[dependencies]
-serde = { version = "1.0.144", features = ["derive"] }

renovate.json

@@ -0,0 +1,9 @@
+{
+  "$schema": "https://docs.renovatebot.com/renovate-schema.json",
+  "packageRules": [
+    {
+      "matchUpdateTypes": ["major", "minor", "patch"],
+      "automerge": true
+    }
+  ]
+}

src/base/cert_utils.rs

@@ -0,0 +1,86 @@
+use std::error::Error;
+use std::io::{Cursor, ErrorKind};
+
+use rustls::{Certificate, PrivateKey};
+use rustls_pemfile::Item;
+
+/// Parse PEM certificates bytes into a [`rustls::Certificate`] structure
+///
+/// An error is returned if not any certificate could be found
+pub fn parse_pem_certificates(certs: &[u8]) -> Result<Vec<Certificate>, Box<dyn Error>> {
+    let certs = rustls_pemfile::certs(&mut Cursor::new(certs))
+        .map(|c| c.map(|c| Certificate(c.to_vec())))
+        .collect::<Result<Vec<_>, _>>()?;
+
+    if certs.is_empty() {
+        Err(std::io::Error::new(
+            ErrorKind::InvalidData,
+            "Could not find any certificate!",
+        ))?;
+        unreachable!();
+    }
+
+    Ok(certs)
+}
+
+/// Parse PEM private key bytes into a [`rustls::PrivateKey`] structure
+pub fn parse_pem_private_key(privkey: &[u8]) -> Result<PrivateKey, Box<dyn Error>> {
+    let key = match rustls_pemfile::read_one(&mut Cursor::new(privkey))? {
+        None => {
+            Err(std::io::Error::new(
+                ErrorKind::Other,
+                "Failed to extract private key!",
+            ))?;
+            unreachable!()
+        }
+        Some(Item::Pkcs8Key(key)) => key.secret_pkcs8_der().to_vec(),
+        Some(Item::Pkcs1Key(key)) => key.secret_pkcs1_der().to_vec(),
+        _ => {
+            Err(std::io::Error::new(
+                ErrorKind::Other,
+                "Unsupported private key type!",
+            ))?;
+            unreachable!();
+        }
+    };
+
+    Ok(PrivateKey(key))
+}
+
+#[cfg(test)]
+mod test {
+    use crate::base::cert_utils::{parse_pem_certificates, parse_pem_private_key};
+
+    const SAMPLE_CERT: &[u8] = include_bytes!("samples/TCPTunnelTest.crt");
+    const SAMPLE_KEY: &[u8] = include_bytes!("samples/TCPTunnelTest.key");
+
+    #[test]
+    fn parse_valid_cert() {
+        parse_pem_certificates(SAMPLE_CERT).unwrap();
+    }
+
+    #[test]
+    fn parse_invalid_cert_1() {
+        parse_pem_certificates("Random content".as_bytes()).unwrap_err();
+    }
+
+    #[test]
+    fn parse_invalid_cert_2() {
+        parse_pem_certificates(SAMPLE_KEY).unwrap_err();
+    }
+
+    #[test]
+    fn parse_valid_key() {
+        parse_pem_private_key(SAMPLE_KEY).unwrap();
+    }
+
+    #[test]
+    fn parse_invalid_key_1() {
+        parse_pem_private_key("Random content".as_bytes()).unwrap_err();
+    }
+
+    #[test]
+    fn parse_invalid_key_2() {
+        parse_pem_private_key(SAMPLE_CERT).unwrap_err();
+    }
+}

src/base/err_utils.rs

@@ -0,0 +1,12 @@
+use std::fmt::Display;
+use std::io::ErrorKind;
+
+/// Encapsulate errors in [`std::io::Error`] with a message
+pub fn encpasulate_error<E: Display, F: ToString>(e: E, msg: F) -> std::io::Error {
+    std::io::Error::new(ErrorKind::Other, format!("{}:\n* {}", msg.to_string(), e))
+}
+
+/// Create a new [`std::io::Error`]
+pub fn new_err(msg: &str) -> std::io::Error {
+    std::io::Error::new(ErrorKind::Other, msg.to_string())
+}

src/base/mod.rs

@@ -0,0 +1,5 @@
+pub mod cert_utils;
+pub mod err_utils;
+mod structs;
+
+pub use structs::{RelayedPort, RemoteConfig};

src/base/samples/TCPTunnelTest.crt

@@ -0,0 +1,29 @@
+-----BEGIN CERTIFICATE-----
+MIIE8DCCAtigAwIBAgIBATANBgkqhkiG9w0BAQsFADAYMRYwFAYDVQQDEw1UQ1BU
+dW5uZWxUZXN0MB4XDTIyMDkwMTA2MzMyMFoXDTI0MDMwMTA2MzMxOFowGDEWMBQG
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+5sjM2EUFmMC5z0zjF9cSYKSHLSI=
+-----END CERTIFICATE-----

src/base/samples/TCPTunnelTest.key

@@ -0,0 +1,51 @@
+-----BEGIN RSA PRIVATE KEY-----
+MIIJKAIBAAKCAgEAuqHcReDdNirlPBk+M5fflszuSiX58uXCMtpcJPH+VNdTSFMW
+whrSQUKI+xNWGbmfCEMvGcABFqBzviBQd+GvqZ4xuyN7Y3PKWYKlbUCzWzXGjafy
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+HOfvisKnygWsUi7efFAVfRop5UUeoxDqGh/UvFy0JsUbFfeRynTH7FIwBSA=
+-----END RSA PRIVATE KEY-----

src/lib.rs

@@ -0,0 +1,6 @@
+mod base;
+pub mod tcp_relay_client;
+pub mod tcp_relay_server;
+
+#[cfg(test)]
+mod test;

src/main.rs

@@ -0,0 +1,49 @@
+use clap::{Parser, Subcommand};
+
+use tcp_over_http::tcp_relay_client::client_config::ClientConfig;
+use tcp_over_http::tcp_relay_server::server_config::ServerConfig;
+
+#[derive(Parser, Debug)]
+#[clap(
+    author,
+    version,
+    about,
+    long_about = "Encapsulate TCP sockets inside HTTP WebSockets\nSource code: https://gitea.communiquons.org/pierre/tcp-over-http"
+)]
+struct CliArgs {
+    #[clap(subcommand)]
+    command: SubCommands,
+}
+
+#[derive(Subcommand, Debug)]
+enum SubCommands {
+    /// Run as server
+    Server(ServerConfig),
+
+    /// Run as client
+    Client(ClientConfig),
+}
+
+#[actix_web::main]
+async fn main() -> std::io::Result<()> {
+    env_logger::init_from_env(env_logger::Env::new().default_filter_or("info"));
+
+    let args: CliArgs = CliArgs::parse();
+
+    // Dispatch the request to the appropriate part of the program
+    match args.command {
+        SubCommands::Server(c) => tcp_over_http::tcp_relay_server::run_app(c).await,
+        SubCommands::Client(c) => tcp_over_http::tcp_relay_client::run_app(c).await,
+    }
+}
+
+#[cfg(test)]
+mod test {
+    use crate::CliArgs;
+
+    #[test]
+    fn verify_cli() {
+        use clap::CommandFactory;
+        CliArgs::command().debug_assert()
+    }
+}

src/tcp_relay_client/client_config.rs

@@ -0,0 +1,110 @@
+use crate::base::err_utils::encpasulate_error;
+use bytes::BufMut;
+use clap::Parser;
+
+/// TCP relay client
+#[derive(Parser, Debug, Clone, Default)]
+#[clap(author, version, about, long_about = None)]
+pub struct ClientConfig {
+    /// Access token
+    #[clap(short, long)]
+    pub token: Option<String>,
+
+    /// Relay server
+    #[clap(short, long, default_value = "http://127.0.0.1:8000")]
+    pub relay_url: String,
+
+    /// Listen address
+    #[clap(short, long, default_value = "127.0.0.1")]
+    pub listen_address: String,
+
+    /// Alternative root certificate to use for server authentication
+    #[clap(short = 'c', long)]
+    pub root_certificate: Option<String>,
+
+    /// TLS certificate for TLS authentication.
+    #[clap(long)]
+    pub tls_cert: Option<String>,
+
+    /// TLS key for TLS authentication.
+    #[clap(long)]
+    pub tls_key: Option<String>,
+
+    #[clap(skip)]
+    pub _keys_cache: KeysCache,
+}
+
+#[derive(Parser, Debug, Clone, Default)]
+pub struct KeysCache {
+    #[clap(skip)]
+    _root_certificate_cache: Option<Vec<u8>>,
+    #[clap(skip)]
+    _tls_cert_cache: Option<Vec<u8>>,
+    #[clap(skip)]
+    _tls_key_cache: Option<Vec<u8>>,
+}
+
+impl ClientConfig {
+    /// Load certificates and put them in cache
+    pub fn load_certificates(&mut self) -> std::io::Result<()> {
+        self._keys_cache = KeysCache {
+            _root_certificate_cache: load_pem_file(&self.root_certificate, "root certificate")?,
+            _tls_cert_cache: load_pem_file(&self.tls_cert, "client certificate")?,
+            _tls_key_cache: load_pem_file(&self.tls_key, "client key")?,
+        };
+        Ok(())
+    }
+
+    /// Get client token, returning a dummy token if none was specified
+    pub fn get_auth_token(&self) -> &str {
+        self.token.as_deref().unwrap_or("none")
+    }
+
+    /// Get root certificate content
+    pub fn get_root_certificate(&self) -> Option<Vec<u8>> {
+        self._keys_cache._root_certificate_cache.clone()
+    }
+
+    /// Get client certificate & key pair, if available
+    pub fn get_client_keypair(&self) -> Option<(&Vec<u8>, &Vec<u8>)> {
+        if let (Some(cert), Some(key)) = (
+            &self._keys_cache._tls_cert_cache,
+            &self._keys_cache._tls_key_cache,
+        ) {
+            Some((cert, key))
+        } else {
+            None
+        }
+    }
+
+    /// Get client certificate & key pair, in a single memory buffer
+    pub fn get_merged_client_keypair(&self) -> Option<Vec<u8>> {
+        self.get_client_keypair().map(|(c, k)| {
+            let mut out = k.to_vec();
+            out.put_slice("\n".as_bytes());
+            out.put_slice(c);
+            out
+        })
+    }
+}
+
+fn load_pem_file(path: &Option<String>, name: &str) -> std::io::Result<Option<Vec<u8>>> {
+    Ok(match path {
+        None => None,
+        Some(p) => Some(
+            std::fs::read(p)
+                .map_err(|e| encpasulate_error(e, format!("Failed to load {name}!")))?,
+        ),
+    })
+}
+
+#[cfg(test)]
+mod test {
+    use crate::tcp_relay_client::client_config::ClientConfig;
+
+    #[test]
+    fn verify_cli() {
+        use clap::CommandFactory;
+        ClientConfig::command().debug_assert()
+    }
+}

src/tcp_relay_client/mod.rs

@@ -0,0 +1,107 @@
+extern crate core;
+
+use std::error::Error;
+use std::io::ErrorKind;
+use std::sync::Arc;
+
+use futures::future::join_all;
+use reqwest::{Certificate, Identity};
+
+use crate::base::err_utils::{encpasulate_error, new_err};
+use crate::base::RemoteConfig;
+use crate::tcp_relay_client::client_config::ClientConfig;
+use crate::tcp_relay_client::relay_client::relay_client;
+
+pub mod client_config;
+mod relay_client;
+
+/// Get remote server config i.e. get the list of forwarded ports
+async fn get_server_config(conf: &ClientConfig) -> Result<RemoteConfig, Box<dyn Error>> {
+    let url = format!("{}/config", conf.relay_url);
+    log::info!("Retrieving configuration on {}", url);
+
+    let mut client = reqwest::Client::builder();
+
+    // Specify root certificate, if any was specified in the command line
+    if let Some(cert) = conf.get_root_certificate() {
+        client = client.add_root_certificate(Certificate::from_pem(&cert)?);
+    }
+
+    // Specify client certificate, if any
+    if let Some(kp) = conf.get_merged_client_keypair() {
+        let identity = Identity::from_pem(&kp)
+            .map_err(|e| encpasulate_error(e, "Failed to load certificates for reqwest!"))?;
+        client = client.identity(identity).use_rustls_tls();
+    }
+
+    let client = client.build().expect("Failed to build reqwest client");
+
+    let req = client
+        .get(url)
+        .header("Authorization", format!("Bearer {}", conf.get_auth_token()))
+        .send()
+        .await?;
+    if req.status().as_u16() != 200 {
+        Err(std::io::Error::new(
+            ErrorKind::Other,
+            format!(
+                "Could not retrieve configuration! (got status {})",
+                req.status()
+            ),
+        ))?;
+    }
+
+    Ok(req.json::<RemoteConfig>().await?)
+}
+
+/// Core logic of the application
+pub async fn run_app(mut args: ClientConfig) -> std::io::Result<()> {
+    args.load_certificates()?;
+    let args = Arc::new(args);
+
+    // Check arguments coherence
+    if args.tls_cert.is_some() != args.tls_key.is_some() {
+        return Err(new_err(
+            "If you specify one of TLS certificate / key, you must then specify the other!",
+        ));
+    }
+
+    if args.get_client_keypair().is_some() {
+        log::info!("Using client-side authentication");
+    }
+
+    // Get server relay configuration (fetch the list of port to forward)
+    let remote_conf = match get_server_config(&args).await {
+        Ok(c) => c,
+        Err(e) => {
+            Err(std::io::Error::new(
+                ErrorKind::Other,
+                format!("Failed to fetch relay configuration from server! {e}"),
+            ))?;
+            unreachable!();
+        }
+    };
+
+    // Start to listen port
+    let mut handles = vec![];
+    for port in remote_conf {
+        let listen_address = format!("{}:{}", args.listen_address, port.port);
+
+        let h = tokio::spawn(relay_client(
+            format!(
+                "{}/ws?id={}&token={}",
+                args.relay_url,
+                port.id,
+                urlencoding::encode(args.get_auth_token())
+            )
+            .replace("http", "ws"),
+            listen_address,
+            args.clone(),
+        ));
+        handles.push(h);
+    }
+
+    join_all(handles).await;
+
+    Ok(())
+}

src/tcp_relay_client/relay_client.rs

@@ -0,0 +1,155 @@
+use std::sync::Arc;
+
+use futures::{SinkExt, StreamExt};
+use rustls::RootCertStore;
+use tokio::io::{AsyncReadExt, AsyncWriteExt};
+use tokio::net::{TcpListener, TcpStream};
+use tokio_tungstenite::tungstenite::Message;
+
+use crate::base::cert_utils;
+
+use crate::tcp_relay_client::client_config::ClientConfig;
+
+pub async fn relay_client(ws_url: String, listen_address: String, config: Arc<ClientConfig>) {
+    log::info!("Start to listen on {}", listen_address);
+    let listener = match TcpListener::bind(&listen_address).await {
+        Ok(l) => l,
+        Err(e) => {
+            log::error!("Failed to start to listen on {}! {}", listen_address, e);
+            std::process::exit(3);
+        }
+    };
+
+    loop {
+        let (socket, _) = listener
+            .accept()
+            .await
+            .expect("Failed to accept new connection!");
+
+        tokio::spawn(relay_connection(ws_url.clone(), socket, config.clone()));
+    }
+}
+
+/// Relay connection
+///
+/// WS read => TCP write
+/// TCP read => WS write
+async fn relay_connection(ws_url: String, socket: TcpStream, conf: Arc<ClientConfig>) {
+    log::debug!("Connecting to {}...", ws_url);
+
+    let ws_stream = if ws_url.starts_with("wss") {
+        let config = rustls::ClientConfig::builder().with_safe_defaults();
+
+        let config = match conf.get_root_certificate() {
+            None => {
+                // Perform a connection over TLS
+                let mut roots = RootCertStore::empty();
+                for cert in rustls_native_certs::load_native_certs()
+                    .expect("Failed to load native certificates")
+                {
+                    roots.add(&rustls::Certificate(cert.0)).unwrap();
+                }
+
+                config.with_root_certificates(roots)
+            }
+            Some(cert) => {
+                log::debug!("Using custom root certificates");
+                let mut store = RootCertStore::empty();
+                cert_utils::parse_pem_certificates(&cert)
+                    .unwrap()
+                    .iter()
+                    .for_each(|c| store.add(c).expect("Failed to add certificate to chain!"));
+
+                config.with_root_certificates(store)
+            }
+        };
+
+        let config = match conf.get_client_keypair() {
+            None => config.with_no_client_auth(),
+            Some((certs, key)) => {
+                let certs = cert_utils::parse_pem_certificates(certs)
+                    .expect("Failed to parse client certificate!");
+
+                let key = cert_utils::parse_pem_private_key(key)
+                    .expect("Failed to parse client auth private key!");
+
+                config
+                    .with_client_auth_cert(certs, key)
+                    .expect("Failed to set client certificate!")
+            }
+        };
+        let connector = tokio_tungstenite::Connector::Rustls(Arc::new(config));
+
+        let (ws_stream, _) =
+            tokio_tungstenite::connect_async_tls_with_config(ws_url, None, false, Some(connector))
+                .await
+                .expect("Failed to connect to server relay!");
+
+        ws_stream
+    } else {
+        let (ws_stream, _) = tokio_tungstenite::connect_async(ws_url)
+            .await
+            .expect("Failed to connect to server relay!");
+
+        ws_stream
+    };
+
+    let (mut tcp_read, mut tcp_write) = socket.into_split();
+    let (mut ws_write, mut ws_read) = ws_stream.split();
+
+    // TCP read -> WS write
+    let future = async move {
+        let mut buff: [u8; 5000] = [0; 5000];
+        loop {
+            match tcp_read.read(&mut buff).await {
+                Ok(s) => {
+                    if let Err(e) = ws_write.send(Message::Binary(Vec::from(&buff[0..s]))).await {
+                        log::error!(
+                            "Failed to write to WS connection! {:?} Exiting TCP read -> WS write loop...",e);
+                        break;
+                    }
+
+                    if s == 0 {
+                        log::info!("Got empty read TCP buffer. Stopping...");
+                        break;
+                    }
+                }
+                Err(e) => {
+                    log::error!(
+                        "Failed to read from TCP connection! {:?} Exitin TCP read -> WS write loop...",
+                        e
+                    );
+                    break;
+                }
+            }
+        }
+    };
+    tokio::spawn(future);
+
+    // WS read -> TCP write
+    while let Some(m) = ws_read.next().await {
+        match m {
+            Err(e) => {
+                log::error!(
+                    "Failed to read from WebSocket. Breaking read loop... {:?}",
+                    e
+                );
+                break;
+            }
+            Ok(Message::Binary(b)) => {
+                if let Err(e) = tcp_write.write_all(&b).await {
+                    log::error!(
+                        "Failed to forward message to websocket. Closing reading end... {:?}",
+                        e
+                    );
+                    break;
+                };
+            }
+            Ok(Message::Close(_r)) => {
+                log::info!("Server asked to close this WebSocket connection");
+                break;
+            }
+            Ok(m) => log::info!("{:?}", m),
+        }
+    }
+}

src/tcp_relay_server/mod.rs

@@ -0,0 +1,130 @@
+use std::sync::Arc;
+
+use actix_web::web::Data;
+use actix_web::{middleware, web, App, HttpRequest, HttpResponse, HttpServer, Responder};
+
+use crate::base::err_utils::{encpasulate_error, new_err};
+use crate::base::{cert_utils, RelayedPort};
+use crate::tcp_relay_server::relay_ws::relay_ws;
+use crate::tcp_relay_server::server_config::ServerConfig;
+use crate::tcp_relay_server::tls_cert_client_verifier::CustomCertClientVerifier;
+
+mod relay_ws;
+pub mod server_config;
+mod tls_cert_client_verifier;
+
+pub async fn hello_route() -> &'static str {
+    "Hello world!"
+}
+
+pub async fn config_route(req: HttpRequest, data: Data<Arc<ServerConfig>>) -> impl Responder {
+    if data.has_token_auth() {
+        let token = req
+            .headers()
+            .get("Authorization")
+            .map(|t| t.to_str().unwrap_or_default())
+            .unwrap_or_default()
+            .strip_prefix("Bearer ")
+            .unwrap_or_default();
+
+        if !data.tokens.iter().any(|t| t.eq(token)) {
+            return HttpResponse::Unauthorized().json("Missing / invalid token");
+        }
+    }
+
+    HttpResponse::Ok().json(
+        data.ports
+            .iter()
+            .enumerate()
+            .map(|(id, port)| RelayedPort {
+                id,
+                port: port + data.increment_ports,
+            })
+            .collect::<Vec<_>>(),
+    )
+}
+
+pub async fn run_app(mut config: ServerConfig) -> std::io::Result<()> {
+    // Check if no port are to be forwarded
+    if config.ports.is_empty() {
+        return Err(new_err("No port to forward!"));
+    }
+
+    // Read tokens from file, if any
+    if let Some(file) = &config.tokens_file {
+        std::fs::read_to_string(file)
+            .map_err(|e| encpasulate_error(e, "Failed to read tokens file!"))?
+            .split('\n')
+            .filter(|l| !l.is_empty())
+            .for_each(|t| config.tokens.push(t.to_string()));
+    }
+
+    if !config.has_auth() {
+        return Err(new_err("No authentication method specified!"));
+    }
+
+    if config.tls_cert.is_some() != config.tls_key.is_some() {
+        return Err(new_err("Incomplete server TLS configuration!"));
+    }
+
+    if config.has_tls_client_auth() && !config.has_tls_config() {
+        return Err(new_err(
+            "Cannot provide client auth without TLS configuration!",
+        ));
+    }
+
+    let args = Arc::new(config);
+
+    // Load TLS configuration, if any
+    let tls_config = if let (Some(cert), Some(key)) = (&args.tls_cert, &args.tls_key) {
+        // Load TLS certificate & private key
+        let cert_file = std::fs::read(cert)
+            .map_err(|e| encpasulate_error(e, "Failed to read certificate file"))?;
+        let key_file = std::fs::read(key)
+            .map_err(|e| encpasulate_error(e, "Failed to read server private key"))?;
+
+        // Get certificates chain
+        let cert_chain = cert_utils::parse_pem_certificates(&cert_file)
+            .map_err(|e| encpasulate_error(e, "Failed to extract certificates"))?;
+
+        // Get private key
+        let key = cert_utils::parse_pem_private_key(&key_file)
+            .map_err(|e| encpasulate_error(e, "Failed to extract private key!"))?;
+
+        let config = rustls::ServerConfig::builder().with_safe_defaults();
+
+        let config = match args.has_tls_client_auth() {
+            true => config
+                .with_client_cert_verifier(Arc::new(CustomCertClientVerifier::new(args.clone())?)),
+            false => config.with_no_client_auth(),
+        };
+
+        let config = config
+            .with_single_cert(cert_chain, key)
+            .expect("Failed to load TLS certificate!");
+
+        Some(config)
+    } else {
+        None
+    };
+
+    log::info!("Starting relay on http://{}", args.listen_address);
+
+    let args_clone = args.clone();
+    let server = HttpServer::new(move || {
+        App::new()
+            .wrap(middleware::Logger::default())
+            .app_data(Data::new(args_clone.clone()))
+            .route("/", web::get().to(hello_route))
+            .route("/config", web::get().to(config_route))
+            .route("/ws", web::get().to(relay_ws))
+    });
+
+    if let Some(tls_conf) = tls_config {
+        server.bind_rustls_021(&args.listen_address, tls_conf)?
+    } else {
+        server.bind(&args.listen_address)?
+    }
+    .run()
+    .await
+}

src/tcp_relay_server/relay_ws.rs

@@ -2,14 +2,14 @@ use std::sync::Arc;
 use std::time::{Duration, Instant};
 
 use actix::{Actor, ActorContext, AsyncContext, Handler, Message, StreamHandler};
-use actix_web::{Error, HttpRequest, HttpResponse, web};
+use actix_web::{web, Error, HttpRequest, HttpResponse};
 use actix_web_actors::ws;
 use actix_web_actors::ws::{CloseCode, CloseReason};
 use tokio::io::{AsyncReadExt, AsyncWriteExt};
 use tokio::net::tcp::{OwnedReadHalf, OwnedWriteHalf};
 use tokio::net::TcpStream;
 
-use crate::args::Args;
+use crate::tcp_relay_server::server_config::ServerConfig;
 
 /// How often heartbeat pings are sent
 const HEARTBEAT_INTERVAL: Duration = Duration::from_secs(5);
@@ -32,7 +32,6 @@ struct RelayWS {
 
     // Client must respond to ping at a specific interval, otherwise we drop connection
     hb: Instant,
-
     // TODO : handle socket close
 }
 
@@ -94,7 +93,6 @@ impl Actor for RelayWS {
             }
 
             log::info!("Exited read loop");
-            // TODO : notify context
         };
 
         tokio::spawn(future);
@@ -110,7 +108,7 @@ impl StreamHandler<Result<ws::Message, ws::ProtocolError>> for RelayWS {
             Ok(ws::Message::Text(text)) => ctx.text(text),
             Ok(ws::Message::Close(_reason)) => ctx.stop(),
             Ok(ws::Message::Binary(data)) => {
-                if let Err(e) = futures::executor::block_on(self.tcp_write.write_all(&data.to_vec())) {
+                if let Err(e) = futures::executor::block_on(self.tcp_write.write_all(&data)) {
                     log::error!("Failed to forward some data, closing connection! {:?}", e);
                     ctx.stop();
                 }
@@ -148,19 +146,33 @@ impl Handler<TCPReadEndClosed> for RelayWS {
 #[derive(serde::Deserialize)]
 pub struct WebSocketQuery {
     id: usize,
-    token: String,
+    token: Option<String>,
 }
 
-pub async fn relay_ws(req: HttpRequest, stream: web::Payload,
+pub async fn relay_ws(
+    req: HttpRequest,
+    stream: web::Payload,
     query: web::Query<WebSocketQuery>,
-                      conf: web::Data<Arc<Args>>) -> Result<HttpResponse, Error> {
-    if !conf.tokens.contains(&query.token) {
-        log::error!("Rejected WS request from {:?} due to invalid token!", req.peer_addr());
+    conf: web::Data<Arc<ServerConfig>>,
+) -> Result<HttpResponse, Error> {
+    if conf.has_token_auth()
+        && !conf
+            .tokens
+            .iter()
+            .any(|t| t == query.token.as_deref().unwrap_or_default())
+    {
+        log::error!(
+            "Rejected WS request from {:?} due to invalid token!",
+            req.peer_addr()
+        );
         return Ok(HttpResponse::Unauthorized().json("Invalid / missing token!"));
     }
 
     if conf.ports.len() <= query.id {
-        log::error!("Rejected WS request from {:?} due to invalid port number!", req.peer_addr());
+        log::error!(
+            "Rejected WS request from {:?} due to invalid port number!",
+            req.peer_addr()
+        );
         return Ok(HttpResponse::BadRequest().json("Invalid port number!"));
     }
 
@@ -169,14 +181,29 @@ pub async fn relay_ws(req: HttpRequest, stream: web::Payload,
     let (tcp_read, tcp_write) = match TcpStream::connect(&upstream_addr).await {
         Ok(s) => s.into_split(),
         Err(e) => {
-            log::error!("Failed to establish connection with upstream server! {:?}", e);
-            return Ok(HttpResponse::InternalServerError()
-                .json("Failed to establish connection!"));
+            log::error!(
+                "Failed to establish connection with upstream server! {:?}",
+                e
+            );
+            return Ok(HttpResponse::InternalServerError().json("Failed to establish connection!"));
         }
     };
 
-    let relay = RelayWS { tcp_read: Some(tcp_read), tcp_write, hb: Instant::now() };
+    let relay = RelayWS {
+        tcp_read: Some(tcp_read),
+        tcp_write,
+        hb: Instant::now(),
+    };
+
     let resp = ws::start(relay, &req, stream);
-    log::info!("Opening new WS connection for {:?} to {}", req.peer_addr(), upstream_addr);
+    log::info!(
+        "Opening new WS connection:\
+         * for {:?}\
+         * to {}\
+         * token {:?}",
+        req.peer_addr(),
+        upstream_addr,
+        query.token
+    );
     resp
 }

src/tcp_relay_server/server_config.rs

@@ -0,0 +1,84 @@
+use clap::Parser;
+
+/// TCP relay server mode
+#[derive(Parser, Debug, Clone)]
+#[clap(
+    author,
+    version,
+    about,
+    long_about = "TCP-over-HTTP server. This program can be configured behind a reverse-proxy (without TLS authentication)."
+)]
+pub struct ServerConfig {
+    /// Access tokens
+    #[clap(short, long)]
+    pub tokens: Vec<String>,
+
+    /// Access tokens stored in a file, one token per line
+    #[clap(long)]
+    pub tokens_file: Option<String>,
+
+    /// Forwarded ports
+    #[clap(short, long)]
+    pub ports: Vec<u16>,
+
+    /// Upstream server
+    #[clap(short, long, default_value = "127.0.0.1")]
+    pub upstream_server: String,
+
+    /// HTTP server listen address
+    #[clap(short, long, default_value = "0.0.0.0:8000")]
+    pub listen_address: String,
+
+    /// Increment ports on client. Useful for debugging and running both client and server
+    /// on the same machine
+    #[clap(short, long, default_value_t = 0)]
+    pub increment_ports: u16,
+
+    /// TLS certificate. Specify also private key to use HTTPS/TLS instead of HTTP
+    #[clap(long)]
+    pub tls_cert: Option<String>,
+
+    /// TLS private key. Specify also certificate to use HTTPS/TLS instead of HTTP
+    #[clap(long)]
+    pub tls_key: Option<String>,
+
+    /// Restrict TLS client authentication to certificates signed directly or indirectly by the
+    /// provided root certificates
+    ///
+    /// This option automatically enable TLS client authentication
+    #[clap(long)]
+    pub tls_client_auth_root_cert: Option<String>,
+
+    /// TLS client authentication revocation list (CRL file)
+    #[clap(long)]
+    pub tls_revocation_list: Option<String>,
+}
+
+impl ServerConfig {
+    pub fn has_token_auth(&self) -> bool {
+        !self.tokens.is_empty()
+    }
+
+    pub fn has_tls_config(&self) -> bool {
+        self.tls_cert.is_some() && self.tls_key.is_some()
+    }
+
+    pub fn has_tls_client_auth(&self) -> bool {
+        self.tls_client_auth_root_cert.is_some()
+    }
+
+    pub fn has_auth(&self) -> bool {
+        self.has_token_auth() || self.has_tls_client_auth()
+    }
+}
+
+#[cfg(test)]
+mod test {
+    use crate::tcp_relay_server::server_config::ServerConfig;
+
+    #[test]
+    fn verify_cli() {
+        use clap::CommandFactory;
+        ServerConfig::command().debug_assert()
+    }
+}

src/tcp_relay_server/tls_cert_client_verifier.rs

@@ -0,0 +1,128 @@
+use std::sync::Arc;
+use std::time::SystemTime;
+
+use rustls::server::{AllowAnyAuthenticatedClient, ClientCertVerified, ClientCertVerifier};
+use rustls::{AlertDescription, Certificate, DistinguishedName, Error, RootCertStore};
+use x509_parser::prelude::{CertificateRevocationList, FromDer, X509Certificate};
+
+use crate::base::cert_utils::parse_pem_certificates;
+use crate::base::err_utils::{encpasulate_error, new_err};
+use crate::tcp_relay_server::server_config::ServerConfig;
+
+pub struct CustomCertClientVerifier {
+    upstream_cert_verifier: Box<Arc<dyn ClientCertVerifier>>,
+    crl: Option<Vec<u8>>,
+}
+
+impl CustomCertClientVerifier {
+    pub fn new(conf: Arc<ServerConfig>) -> std::io::Result<Self> {
+        // Build root certifications list
+        let cert_path = conf
+            .tls_client_auth_root_cert
+            .as_deref()
+            .expect("No root certificates for client authentication provided!");
+        let cert_file = std::fs::read(cert_path).map_err(|e| {
+            encpasulate_error(
+                e,
+                "Failed to read root certificates for client authentication!",
+            )
+        })?;
+
+        let root_certs = parse_pem_certificates(&cert_file).map_err(|e| {
+            encpasulate_error(
+                e,
+                "Failed to read root certificates for server authentication!",
+            )
+        })?;
+
+        if root_certs.is_empty() {
+            return Err(new_err("No certificates found for client authentication!"));
+        }
+
+        let mut store = RootCertStore::empty();
+        for cert in root_certs {
+            store
+                .add(&cert)
+                .expect("Failed to add certificate to root store");
+        }
+
+        // Parse CRL file (if any)
+        let crl = if let Some(crl_file) = &conf.tls_revocation_list {
+            let crl_file = std::fs::read(crl_file)
+                .map_err(|e| encpasulate_error(e, "Failed to open / read CRL file!"))?;
+
+            let parsed_crl = pem::parse(crl_file)
+                .map_err(|e| encpasulate_error(e, "Failed to decode CRL file!"))?;
+
+            Some(parsed_crl.into_contents())
+        } else {
+            None
+        };
+
+        Ok(Self {
+            upstream_cert_verifier: Box::new(Arc::new(AllowAnyAuthenticatedClient::new(store))),
+            crl,
+        })
+    }
+}
+
+impl ClientCertVerifier for CustomCertClientVerifier {
+    fn offer_client_auth(&self) -> bool {
+        true
+    }
+
+    fn client_auth_mandatory(&self) -> bool {
+        true
+    }
+
+    fn client_auth_root_subjects(&self) -> &[DistinguishedName] {
+        &[]
+    }
+
+    fn verify_client_cert(
+        &self,
+        end_entity: &Certificate,
+        intermediates: &[Certificate],
+        now: SystemTime,
+    ) -> Result<ClientCertVerified, Error> {
+        let (_rem, cert) =
+            X509Certificate::from_der(&end_entity.0).expect("Failed to read certificate!");
+
+        // Check the certificates sent by the client has been revoked
+        if let Some(crl) = &self.crl {
+            let (_rem, crl) =
+                CertificateRevocationList::from_der(crl).expect("Failed to read CRL!");
+
+            for revoked in crl.iter_revoked_certificates() {
+                if revoked.user_certificate == cert.serial {
+                    log::error!(
+                        "Client attempted to use a revoked certificate! Serial={:?} Subject={}",
+                        cert.serial,
+                        cert.subject
+                    );
+                    return Err(Error::AlertReceived(AlertDescription::CertificateRevoked));
+                }
+            }
+        }
+
+        let result = self
+            .upstream_cert_verifier
+            .verify_client_cert(end_entity, intermediates, now);
+
+        match result.as_ref() {
+            Err(e) => log::error!(
+                "FAILED authentication attempt from Serial={} / Subject={} : {}",
+                cert.serial,
+                cert.subject,
+                e
+            ),
+            Ok(_) => log::info!(
+                "SUCCESSFUL authentication attempt from Serial={} / Subject={}",
+                cert.serial,
+                cert.subject
+            ),
+        }
+
+        result
+    }
+}

src/test/client_invalid_tls_configuration.rs

@@ -0,0 +1,160 @@
+use tokio::task;
+
+use crate::tcp_relay_client::client_config::ClientConfig;
+use crate::tcp_relay_server::server_config::ServerConfig;
+use crate::test::dummy_tcp_sockets::wait_for_port;
+use crate::test::pki::Pki;
+use crate::test::test_files_utils::create_temp_file_with_random_content;
+use crate::test::{get_port_number, PortsAllocation, BAD_PATH, LOCALHOST_IP};
+
+fn port(index: u16) -> u16 {
+    get_port_number(PortsAllocation::ClientInvalidTlsConfiguration, index)
+}
+
+#[tokio::test()]
+async fn random_file_for_cert() {
+    let _ = env_logger::builder().is_test(true).try_init();
+
+    let pki = Pki::load();
+    let random_file = create_temp_file_with_random_content();
+
+    crate::tcp_relay_client::run_app(ClientConfig {
+        token: Some("token".to_string()),
+        relay_url: format!("https://{}:{}", LOCALHOST_IP, port(0)),
+        listen_address: LOCALHOST_IP.to_string(),
+        tls_cert: Some(random_file.to_string_lossy().to_string()),
+        tls_key: Some(pki.valid_client_key.file_path()),
+        ..Default::default()
+    })
+    .await
+    .unwrap_err();
+}
+
+#[tokio::test()]
+async fn random_file_for_key() {
+    let _ = env_logger::builder().is_test(true).try_init();
+
+    let pki = Pki::load();
+    let random_file = create_temp_file_with_random_content();
+
+    crate::tcp_relay_client::run_app(ClientConfig {
+        token: Some("token".to_string()),
+        relay_url: format!("https://{}:{}", LOCALHOST_IP, port(0)),
+        listen_address: LOCALHOST_IP.to_string(),
+        tls_cert: Some(pki.valid_client_crt.file_path()),
+        tls_key: Some(random_file.to_string_lossy().to_string()),
+        ..Default::default()
+    })
+    .await
+    .unwrap_err();
+}
+
+#[tokio::test()]
+async fn bad_pem_file_for_cert() {
+    let _ = env_logger::builder().is_test(true).try_init();
+
+    let pki = Pki::load();
+
+    crate::tcp_relay_client::run_app(ClientConfig {
+        token: Some("token".to_string()),
+        relay_url: format!("https://{}:{}", LOCALHOST_IP, port(0)),
+        listen_address: LOCALHOST_IP.to_string(),
+        tls_cert: Some(pki.root_ca_crl.file_path()),
+        tls_key: Some(pki.valid_client_key.file_path()),
+        ..Default::default()
+    })
+    .await
+    .unwrap_err();
+}
+
+#[tokio::test()]
+async fn bad_pem_file_for_key() {
+    let _ = env_logger::builder().is_test(true).try_init();
+
+    let pki = Pki::load();
+
+    crate::tcp_relay_client::run_app(ClientConfig {
+        token: Some("token".to_string()),
+        relay_url: format!("https://{}:{}", LOCALHOST_IP, port(0)),
+        listen_address: LOCALHOST_IP.to_string(),
+        tls_cert: Some(pki.valid_client_crt.file_path()),
+        tls_key: Some(pki.root_ca_crl.file_path()),
+        ..Default::default()
+    })
+    .await
+    .unwrap_err();
+}
+
+#[tokio::test()]
+async fn non_existing_cert() {
+    let _ = env_logger::builder().is_test(true).try_init();
+
+    let pki = Pki::load();
+
+    crate::tcp_relay_client::run_app(ClientConfig {
+        token: Some("token".to_string()),
+        relay_url: format!("https://{}:{}", LOCALHOST_IP, port(0)),
+        listen_address: LOCALHOST_IP.to_string(),
+        tls_cert: Some(BAD_PATH.to_string()),
+        tls_key: Some(pki.valid_client_key.file_path()),
+        ..Default::default()
+    })
+    .await
+    .unwrap_err();
+}
+
+#[tokio::test()]
+async fn non_existing_key() {
+    let _ = env_logger::builder().is_test(true).try_init();
+
+    let pki = Pki::load();
+
+    crate::tcp_relay_client::run_app(ClientConfig {
+        token: Some("token".to_string()),
+        relay_url: format!("https://{}:{}", LOCALHOST_IP, port(0)),
+        listen_address: LOCALHOST_IP.to_string(),
+        tls_cert: Some(pki.valid_client_crt.file_path()),
+        tls_key: Some(BAD_PATH.to_string()),
+        ..Default::default()
+    })
+    .await
+    .unwrap_err();
+}
+
+#[tokio::test()]
+async fn unmatched_key_cert_pair() {
+    let _ = env_logger::builder().is_test(true).try_init();
+
+    let pki = Pki::load();
+    let local_set = task::LocalSet::new();
+    local_set
+        .run_until(async move {
+            // Start server relay
+            task::spawn_local(crate::tcp_relay_server::run_app(ServerConfig {
+                tokens: vec!["dqsd".to_string()],
+                tokens_file: None,
+                ports: vec![port(1)],
+                upstream_server: "127.0.0.1".to_string(),
+                listen_address: format!("127.0.0.1:{}", port(0)),
+                increment_ports: 1,
+                tls_cert: Some(pki.localhost_crt.file_path()),
+                tls_key: Some(pki.localhost_key.file_path()),
+                tls_client_auth_root_cert: Some(pki.root_ca_crt.file_path()),
+                tls_revocation_list: None,
+            }));
+            wait_for_port(port(0)).await;
+
+            crate::tcp_relay_client::run_app(ClientConfig {
+                token: Some("token".to_string()),
+                relay_url: format!("https://localhost:{}", port(0)),
+                listen_address: LOCALHOST_IP.to_string(),
+                tls_cert: Some(pki.valid_client_crt.file_path()),
+                tls_key: Some(pki.revoked_client_key.file_path()),
+                root_certificate: Some(pki.root_ca_crt.file_path()),
+                ..Default::default()
+            })
+            .await
+            .unwrap_err();
+        })
+        .await;
+}

src/test/client_invalid_tls_root_certificate_file.rs

@@ -0,0 +1,59 @@
+use crate::tcp_relay_client::client_config::ClientConfig;
+use crate::test::pki::Pki;
+use crate::test::test_files_utils::create_temp_file_with_random_content;
+use crate::test::{get_port_number, PortsAllocation, BAD_PATH, LOCALHOST_IP};
+
+const VALID_TOKEN: &str = "AvalidTOKEN";
+
+fn port(index: u16) -> u16 {
+    get_port_number(PortsAllocation::TestsWithoutPortOpened, index)
+}
+
+#[tokio::test()]
+async fn invalid_file_type() {
+    let _ = env_logger::builder().is_test(true).try_init();
+
+    let pki = Pki::load();
+
+    crate::tcp_relay_client::run_app(ClientConfig {
+        token: Some(VALID_TOKEN.to_string()),
+        relay_url: format!("https://{}:{}", LOCALHOST_IP, port(0)),
+        listen_address: LOCALHOST_IP.to_string(),
+        root_certificate: Some(pki.expired_client_key.file_path()),
+        ..Default::default()
+    })
+    .await
+    .unwrap_err();
+}
+
+#[tokio::test()]
+async fn non_existing_file() {
+    let _ = env_logger::builder().is_test(true).try_init();
+
+    crate::tcp_relay_client::run_app(ClientConfig {
+        token: Some(VALID_TOKEN.to_string()),
+        relay_url: format!("https://{}:{}", LOCALHOST_IP, port(0)),
+        listen_address: LOCALHOST_IP.to_string(),
+        root_certificate: Some(BAD_PATH.to_string()),
+        ..Default::default()
+    })
+    .await
+    .unwrap_err();
+}
+
+#[tokio::test()]
+async fn random_file() {
+    let _ = env_logger::builder().is_test(true).try_init();
+
+    let random_file = create_temp_file_with_random_content();
+
+    crate::tcp_relay_client::run_app(ClientConfig {
+        token: Some(VALID_TOKEN.to_string()),
+        relay_url: format!("https://{}:{}", LOCALHOST_IP, port(0)),
+        listen_address: LOCALHOST_IP.to_string(),
+        root_certificate: Some(random_file.to_string_lossy().to_string()),
+        ..Default::default()
+    })
+    .await
+    .unwrap_err();
+}

src/test/client_try_tls_while_there_is_no_tls.rs

@@ -0,0 +1,55 @@
+use tokio::task;
+
+use crate::tcp_relay_client::client_config::ClientConfig;
+use crate::tcp_relay_server::server_config::ServerConfig;
+use crate::test::dummy_tcp_sockets::{wait_for_port, DummyTCPServer};
+use crate::test::{get_port_number, PortsAllocation, LOCALHOST_IP};
+
+const VALID_TOKEN: &str = "AvalidTOKEN";
+
+fn port(index: u16) -> u16 {
+    get_port_number(PortsAllocation::ClientTryTLSWhileThereIsNoTLS, index)
+}
+
+#[tokio::test()]
+async fn test() {
+    let _ = env_logger::builder().is_test(true).try_init();
+
+    // Start internal service
+    let local_server = DummyTCPServer::start(port(1)).await;
+    tokio::spawn(async move {
+        local_server.loop_conn_square_operations().await;
+    });
+
+    let local_set = task::LocalSet::new();
+    local_set
+        .run_until(async move {
+            wait_for_port(port(1)).await;
+
+            // Start server relay
+            task::spawn_local(crate::tcp_relay_server::run_app(ServerConfig {
+                tokens: vec![VALID_TOKEN.to_string()],
+                tokens_file: None,
+                ports: vec![port(1)],
+                upstream_server: "127.0.0.1".to_string(),
+                listen_address: format!("127.0.0.1:{}", port(0)),
+                increment_ports: 1,
+                tls_cert: None,
+                tls_key: None,
+                tls_client_auth_root_cert: None,
+                tls_revocation_list: None,
+            }));
+            wait_for_port(port(0)).await;
+
+            crate::tcp_relay_client::run_app(ClientConfig {
+                token: Some(VALID_TOKEN.to_string()),
+                relay_url: format!("https://{}:{}", LOCALHOST_IP, port(0)),
+                listen_address: LOCALHOST_IP.to_string(),
+                root_certificate: None,
+                ..Default::default()
+            })
+            .await
+            .unwrap_err();
+        })
+        .await;
+}

src/test/dummy_tcp_sockets.rs

@@ -0,0 +1,339 @@
+use std::time::Duration;
+
+use rand::Rng;
+use tokio::io::{AsyncReadExt, AsyncWriteExt};
+use tokio::net::{TcpListener, TcpStream};
+use tokio::time;
+
+use crate::test::LOCALHOST_IP;
+
+pub struct DummyTCPServer(TcpListener);
+
+impl DummyTCPServer {
+    pub async fn start(port: u16) -> Self {
+        let addr = format!("{}:{}", LOCALHOST_IP, port);
+        println!("[DUMMY TCP] Listen on {}", addr);
+        let listener = TcpListener::bind(addr)
+            .await
+            .expect("Failed to bind dummy TCP listener!");
+        Self(listener)
+    }
+
+    /// Receive chunk of data from following connection
+    pub async fn read_next_connection(&self) -> Vec<u8> {
+        let (mut conn, _addr) = self
+            .0
+            .accept()
+            .await
+            .expect("Could not open next connection!");
+
+        let mut buff = Vec::with_capacity(100);
+        conn.read_to_end(&mut buff).await.unwrap();
+
+        buff
+    }
+
+    /// Receive chunk of data from following connection
+    pub async fn read_then_write_next_connection(&self, to_send: &[u8]) -> Vec<u8> {
+        let (mut conn, _addr) = self
+            .0
+            .accept()
+            .await
+            .expect("Could not open next connection!");
+
+        let mut buff: [u8; 100] = [0; 100];
+        let size = conn.read(&mut buff).await.unwrap();
+
+        conn.write_all(to_send).await.unwrap();
+
+        buff[0..size].to_vec()
+    }
+
+    /// Receive chunk of data from following connection
+    pub async fn write_next_connection(&self, to_send: &[u8]) {
+        let (mut conn, _addr) = self
+            .0
+            .accept()
+            .await
+            .expect("Could not open next connection!");
+
+        conn.write_all(to_send).await.unwrap()
+    }
+
+    /// Perform complex exchange: receive numbers from client and respond with their square
+    pub async fn next_conn_square_operations(&self) {
+        let (mut conn, _addr) = self
+            .0
+            .accept()
+            .await
+            .expect("Could not open next connection!");
+
+        let mut buff: [u8; 100] = [0; 100];
+        loop {
+            let size = conn.read(&mut buff).await.unwrap();
+            if size == 0 {
+                break;
+            }
+
+            let content = String::from_utf8_lossy(&buff[0..size])
+                .to_string()
+                .parse::<i64>()
+                .unwrap();
+
+            conn.write_all((content * content).to_string().as_bytes())
+                .await
+                .unwrap();
+        }
+    }
+
+    pub async fn loop_conn_square_operations(&self) {
+        loop {
+            self.next_conn_square_operations().await
+        }
+    }
+
+    /// Perform complex exchange: receive numbers from client and respond with their value + a given number
+    pub async fn next_conn_add_operations(&self, inc: i32) {
+        let (mut conn, _addr) = self
+            .0
+            .accept()
+            .await
+            .expect("Could not open next connection!");
+
+        let mut buff: [u8; 100] = [0; 100];
+        loop {
+            let size = conn.read(&mut buff).await.unwrap();
+            if size == 0 {
+                break;
+            }
+
+            let content = String::from_utf8_lossy(&buff[0..size])
+                .to_string()
+                .parse::<i64>()
+                .unwrap();
+
+            conn.write_all((content + inc as i64).to_string().as_bytes())
+                .await
+                .unwrap();
+        }
+    }
+
+    pub async fn loop_next_conn_add_operations(&self, inc: i32) {
+        loop {
+            self.next_conn_add_operations(inc).await
+        }
+    }
+}
+
+pub async fn dummy_tcp_client_read_conn(port: u16) -> Vec<u8> {
+    let mut socket = TcpStream::connect(format!("127.0.0.1:{}", port))
+        .await
+        .expect("Failed to connect to dummy TCP server!");
+
+    let mut buff: [u8; 100] = [0; 100];
+    let size = socket.read(&mut buff).await.unwrap();
+
+    buff[0..size].to_vec()
+}
+
+pub async fn dummy_tcp_client_write_then_read_conn(port: u16, data: &[u8]) -> Vec<u8> {
+    let mut socket = TcpStream::connect(format!("127.0.0.1:{}", port))
+        .await
+        .expect("Failed to connect to dummy TCP server!");
+
+    socket.write_all(data).await.unwrap();
+
+    let mut buff: [u8; 100] = [0; 100];
+    let size = socket.read(&mut buff).await.unwrap();
+
+    buff[0..size].to_vec()
+}
+
+pub async fn dummy_tcp_client_write_conn(port: u16, data: &[u8]) {
+    let mut socket = TcpStream::connect(format!("127.0.0.1:{}", port))
+        .await
+        .expect("Failed to connect to dummy TCP server!");
+
+    socket.write_all(data).await.unwrap()
+}
+
+pub async fn dummy_tcp_client_square_root_requests(port: u16, num_exchanges: usize) {
+    let mut socket = TcpStream::connect(format!("127.0.0.1:{}", port))
+        .await
+        .expect("Failed to connect to dummy TCP server!");
+
+    let mut rng = rand::thread_rng();
+    let mut buff: [u8; 100] = [0; 100];
+
+    for _ in 0..num_exchanges {
+        let num = rng.gen::<i32>() % 100;
+        socket.write_all(num.to_string().as_bytes()).await.unwrap();
+
+        let size = socket.read(&mut buff).await.unwrap();
+
+        if size == 0 {
+            panic!("Got empty response!");
+        }
+
+        let got = String::from_utf8_lossy(&buff[0..size])
+            .to_string()
+            .parse::<i64>()
+            .unwrap();
+        println!("{} * {} = {} (based on server response)", num, num, got);
+        assert_eq!((num * num) as i64, got);
+    }
+}
+
+pub async fn dummy_tcp_client_additions_requests(port: u16, inc: i32, num_exchanges: usize) {
+    let mut socket = TcpStream::connect(format!("127.0.0.1:{}", port))
+        .await
+        .expect("Failed to connect to dummy TCP server!");
+
+    let mut rng = rand::thread_rng();
+    let mut buff: [u8; 100] = [0; 100];
+
+    for _ in 0..num_exchanges {
+        let num = rng.gen::<i32>() % 100;
+        socket.write_all(num.to_string().as_bytes()).await.unwrap();
+
+        let size = socket.read(&mut buff).await.unwrap();
+
+        if size == 0 {
+            panic!("Got empty response!");
+        }
+
+        let got = String::from_utf8_lossy(&buff[0..size])
+            .to_string()
+            .parse::<i64>()
+            .unwrap();
+        println!("{} + {} = {} (based on server response)", num, inc, got);
+        assert_eq!((num + inc) as i64, got);
+    }
+}
+
+/// Check whether a given port is open or not
+pub async fn is_port_open(port: u16) -> bool {
+    match TcpStream::connect(("127.0.0.1", port)).await {
+        Ok(_) => true,
+        Err(_) => false,
+    }
+}
+
+/// Wait for a port to become available
+pub async fn wait_for_port(port: u16) {
+    for _ in 0..50 {
+        if is_port_open(port).await {
+            return;
+        }
+        time::sleep(Duration::from_millis(10)).await;
+    }
+
+    eprintln!("Port {} did not open in time!", port);
+    std::process::exit(2);
+}
+
+mod test {
+    use crate::test::dummy_tcp_sockets::{
+        dummy_tcp_client_additions_requests, dummy_tcp_client_read_conn,
+        dummy_tcp_client_square_root_requests, dummy_tcp_client_write_conn,
+        dummy_tcp_client_write_then_read_conn, DummyTCPServer,
+    };
+    use crate::test::{get_port_number, PortsAllocation};
+
+    fn port(index: u16) -> u16 {
+        get_port_number(PortsAllocation::DummyTCPServer, index)
+    }
+
+    #[tokio::test]
+    async fn socket_read_from_server() {
+        const DATA: &[u8] = "Hello world!!!".as_bytes();
+
+        let listener = DummyTCPServer::start(port(0)).await;
+        let handle = tokio::spawn(async move {
+            listener.write_next_connection(DATA).await;
+        });
+        let data = dummy_tcp_client_read_conn(port(0)).await;
+        assert_eq!(data, DATA);
+
+        handle.await.unwrap();
+    }
+
+    #[tokio::test]
+    async fn socket_write_to_server() {
+        const DATA: &[u8] = "Hello world 2".as_bytes();
+
+        let listener = DummyTCPServer::start(port(1)).await;
+        tokio::spawn(async move {
+            dummy_tcp_client_write_conn(port(1), DATA).await;
+        });
+        let data = listener.read_next_connection().await;
+        assert_eq!(data, DATA);
+    }
+
+    #[tokio::test]
+    async fn socket_read_and_write_to_server() {
+        const DATA_1: &[u8] = "Hello world 3a".as_bytes();
+        const DATA_2: &[u8] = "Hello world 3b".as_bytes();
+
+        let listener = DummyTCPServer::start(port(2)).await;
+        let handle = tokio::spawn(async move {
+            println!("client handle");
+            let data = dummy_tcp_client_write_then_read_conn(port(2), DATA_1).await;
+            assert_eq!(data, DATA_2);
+        });
+        let h2 = tokio::spawn(async move {
+            println!("server handle");
+            let data = listener.read_then_write_next_connection(DATA_2).await;
+            assert_eq!(data, DATA_1);
+        });
+
+        handle.await.unwrap();
+        h2.await.unwrap();
+    }
+
+    #[tokio::test]
+    async fn socket_dummy_root_calculator() {
+        let listener = DummyTCPServer::start(port(3)).await;
+        let handle = tokio::spawn(async move {
+            listener.next_conn_square_operations().await;
+        });
+        let data = dummy_tcp_client_write_then_read_conn(port(3), "5".as_bytes()).await;
+        assert_eq!(data, "25".as_bytes());
+
+        handle.await.unwrap();
+    }
+
+    #[tokio::test]
+    async fn socket_dummy_root_calculator_multiple() {
+        let listener = DummyTCPServer::start(port(4)).await;
+        let handle = tokio::spawn(async move {
+            listener.next_conn_square_operations().await;
+        });
+        dummy_tcp_client_square_root_requests(port(4), 10).await;
+
+        handle.await.unwrap();
+    }
+
+    #[tokio::test]
+    async fn socket_dummy_addition_calculator() {
+        let listener = DummyTCPServer::start(port(5)).await;
+        let handle = tokio::spawn(async move {
+            listener.next_conn_add_operations(4).await;
+        });
+        let data = dummy_tcp_client_write_then_read_conn(port(5), "5".as_bytes()).await;
+        assert_eq!(data, "9".as_bytes());
+
+        handle.await.unwrap();
+    }
+
+    #[tokio::test]
+    async fn socket_dummy_addition_calculator_multiple() {
+        let listener = DummyTCPServer::start(port(6)).await;
+        let handle = tokio::spawn(async move {
+            listener.next_conn_add_operations(7).await;
+        });
+        dummy_tcp_client_additions_requests(port(6), 7, 10).await;
+
+        handle.await.unwrap();
+    }
+}

src/test/invalid_with_token_auth.rs

@@ -0,0 +1,57 @@
+use tokio::task;
+
+use crate::tcp_relay_client::client_config::ClientConfig;
+use crate::tcp_relay_server::server_config::ServerConfig;
+use crate::test::dummy_tcp_sockets::{wait_for_port, DummyTCPServer};
+use crate::test::{get_port_number, PortsAllocation, LOCALHOST_IP};
+
+const VALID_TOKEN: &str = "AvalidTOKEN";
+const INVALID_TOKEN: &str = "AnInvalidTOKEN";
+
+fn port(index: u16) -> u16 {
+    get_port_number(PortsAllocation::InvalidWithTokenAuth, index)
+}
+
+#[tokio::test()]
+async fn invalid_with_token_auth() {
+    let _ = env_logger::builder().is_test(true).try_init();
+
+    tokio::spawn(async move {
+        // Start internal service
+        let local_server = DummyTCPServer::start(port(1)).await;
+        local_server.loop_conn_square_operations().await;
+    });
+
+    let local_set = task::LocalSet::new();
+    local_set
+        .run_until(async move {
+            wait_for_port(port(1)).await;
+
+            // Start server relay
+            task::spawn_local(crate::tcp_relay_server::run_app(ServerConfig {
+                tokens: vec![VALID_TOKEN.to_string()],
+                tokens_file: None,
+                ports: vec![port(1)],
+                upstream_server: "127.0.0.1".to_string(),
+                listen_address: format!("127.0.0.1:{}", port(0)),
+                increment_ports: 1,
+                tls_cert: None,
+                tls_key: None,
+                tls_client_auth_root_cert: None,
+                tls_revocation_list: None,
+            }));
+            wait_for_port(port(0)).await;
+
+            // Start client relay
+            crate::tcp_relay_client::run_app(ClientConfig {
+                token: Some(INVALID_TOKEN.to_string()),
+                relay_url: format!("http://{}:{}", LOCALHOST_IP, port(0)),
+                listen_address: LOCALHOST_IP.to_string(),
+                root_certificate: None,
+                ..Default::default()
+            })
+            .await
+            .unwrap_err();
+        })
+        .await;
+}

src/test/mod.rs

@@ -0,0 +1,54 @@
+#[non_exhaustive]
+enum PortsAllocation {
+    TestsWithoutPortOpened,
+    DummyTCPServer,
+    ValidWithTokenAuth,
+    ValidWithTLSAuth,
+    InvalidWithTokenAuth,
+    ValidWithMultipleTokenAuth,
+    ValidWithTokenFile,
+    ClientTryTLSWhileThereIsNoTLS,
+    ValidTokenWithCustomIncrement,
+    ValidWithTokenAuthMultiplePorts,
+    ValidWithTokenAuthAndServerTLS,
+    WithTokenAuthAndInvalidServerTLSBadCA,
+    WithTokenAuthAndInvalidServerTLSExpiredAndBadCN,
+    TlsAuthExpiredClientCertificate,
+    TlsAuthRevokedClientCertificate,
+    TlsAuthInvalidClientCertificate,
+    ClientInvalidTlsConfiguration,
+}
+
+fn get_port_number(alloc: PortsAllocation, index: u16) -> u16 {
+    30000 + 20 * (alloc as u16) + index
+}
+
+const LOCALHOST_IP: &str = "127.0.0.1";
+const BAD_PATH: &str = "/bad/path/to/key/file";
+
+mod dummy_tcp_sockets;
+mod pki;
+mod test_files_utils;
+
+mod client_invalid_tls_configuration;
+mod client_invalid_tls_root_certificate_file;
+mod client_try_tls_while_there_is_no_tls;
+mod invalid_with_token_auth;
+mod server_invalid_tls_config_invalid_cert;
+mod server_invalid_tls_config_invalid_client_crl;
+mod server_invalid_tls_config_invalid_client_root_cert;
+mod server_invalid_tls_config_invalid_key;
+mod server_invalid_token_file;
+mod server_missing_auth;
+mod tls_auth_expired_certificate;
+mod tls_auth_invalid_certificate;
+mod tls_auth_revoked_certificate;
+mod valid_token_with_custom_increment;
+mod valid_with_multiple_token_auth;
+mod valid_with_tls_auth;
+mod valid_with_token_auth;
+mod valid_with_token_auth_and_server_tls;
+mod valid_with_token_auth_multiple_ports;
+mod valid_with_token_file;
+mod with_token_auth_and_invalid_server_tls_bad_ca;
+mod with_token_auth_and_invalid_server_tls_expired_and_bad_cn;

src/test/pki.rs

@@ -0,0 +1,53 @@
+use mktemp::Temp;
+
+use crate::test::test_files_utils::create_temp_file_with_content;
+
+pub struct PemHolder(Temp);
+
+impl PemHolder {
+    fn new(b: &[u8]) -> Self {
+        Self(create_temp_file_with_content(b))
+    }
+
+    pub fn file_path(&self) -> String {
+        self.0.to_str().unwrap().to_string()
+    }
+}
+
+pub struct Pki {
+    pub expired_client_key: PemHolder,
+    pub expired_client_crt: PemHolder,
+    pub localhost_crt: PemHolder,
+    pub localhost_key: PemHolder,
+    pub other_ca_crl: PemHolder,
+    pub other_ca_crt: PemHolder,
+    pub other_ca_key: PemHolder,
+    pub revoked_client_crt: PemHolder,
+    pub revoked_client_key: PemHolder,
+    pub root_ca_crl: PemHolder,
+    pub root_ca_crt: PemHolder,
+    pub root_ca_key: PemHolder,
+    pub valid_client_crt: PemHolder,
+    pub valid_client_key: PemHolder,
+}
+
+impl Pki {
+    pub fn load() -> Self {
+        Self {
+            expired_client_key: PemHolder::new(include_bytes!("test_pki/ExpiredClient.key")),
+            expired_client_crt: PemHolder::new(include_bytes!("test_pki/ExpiredClient.crt")),
+            localhost_crt: PemHolder::new(include_bytes!("test_pki/localhost.crt")),
+            localhost_key: PemHolder::new(include_bytes!("test_pki/localhost.key")),
+            other_ca_crl: PemHolder::new(include_bytes!("test_pki/OtherCA.crl")),
+            other_ca_crt: PemHolder::new(include_bytes!("test_pki/OtherCA.crt")),
+            other_ca_key: PemHolder::new(include_bytes!("test_pki/OtherCA.key")),
+            revoked_client_crt: PemHolder::new(include_bytes!("test_pki/RevokedClient.crt")),
+            revoked_client_key: PemHolder::new(include_bytes!("test_pki/RevokedClient.key")),
+            root_ca_crl: PemHolder::new(include_bytes!("test_pki/TCPTunnelTestCA.crl")),
+            root_ca_crt: PemHolder::new(include_bytes!("test_pki/TCPTunnelTestCA.crt")),
+            root_ca_key: PemHolder::new(include_bytes!("test_pki/TCPTunnelTestCA.key")),
+            valid_client_crt: PemHolder::new(include_bytes!("test_pki/ValidClient.crt")),
+            valid_client_key: PemHolder::new(include_bytes!("test_pki/ValidClient.key")),
+        }
+    }
+}

src/test/server_invalid_tls_config_invalid_cert.rs

@@ -0,0 +1,100 @@
+use crate::tcp_relay_server::server_config::ServerConfig;
+use crate::test::pki::Pki;
+use crate::test::test_files_utils::create_temp_file_with_random_content;
+use crate::test::{get_port_number, PortsAllocation, BAD_PATH};
+
+const TOKEN: &str = "mytok";
+
+fn port(index: u16) -> u16 {
+    get_port_number(PortsAllocation::TestsWithoutPortOpened, index)
+}
+
+#[tokio::test]
+async fn unspecified() {
+    let _ = env_logger::builder().is_test(true).try_init();
+
+    let pki = Pki::load();
+
+    crate::tcp_relay_server::run_app(ServerConfig {
+        tokens: vec![TOKEN.to_string()],
+        tokens_file: None,
+        ports: vec![port(1)],
+        upstream_server: "127.0.0.1".to_string(),
+        listen_address: format!("127.0.0.1:{}", port(0)),
+        increment_ports: 1,
+        tls_cert: None,
+        tls_key: Some(pki.localhost_key.file_path()),
+        tls_client_auth_root_cert: None,
+        tls_revocation_list: None,
+    })
+    .await
+    .unwrap_err();
+}
+
+#[tokio::test]
+async fn incorrect_pem_type() {
+    let _ = env_logger::builder().is_test(true).try_init();
+
+    let pki = Pki::load();
+
+    crate::tcp_relay_server::run_app(ServerConfig {
+        tokens: vec![TOKEN.to_string()],
+        tokens_file: None,
+        ports: vec![port(1)],
+        upstream_server: "127.0.0.1".to_string(),
+        listen_address: format!("127.0.0.1:{}", port(0)),
+        increment_ports: 1,
+        tls_cert: Some(pki.root_ca_crl.file_path()),
+        tls_key: Some(pki.localhost_key.file_path()),
+        tls_client_auth_root_cert: None,
+        tls_revocation_list: None,
+    })
+    .await
+    .unwrap_err();
+}
+
+#[tokio::test]
+async fn random_contents() {
+    let _ = env_logger::builder().is_test(true).try_init();
+
+    let pki = Pki::load();
+
+    let random_file = create_temp_file_with_random_content();
+
+    crate::tcp_relay_server::run_app(ServerConfig {
+        tokens: vec![TOKEN.to_string()],
+        tokens_file: None,
+        ports: vec![port(1)],
+        upstream_server: "127.0.0.1".to_string(),
+        listen_address: format!("127.0.0.1:{}", port(0)),
+        increment_ports: 1,
+        tls_cert: Some(random_file.to_string_lossy().to_string()),
+        tls_key: Some(pki.localhost_key.file_path()),
+        tls_client_auth_root_cert: None,
+        tls_revocation_list: None,
+    })
+    .await
+    .unwrap_err();
+}
+
+#[tokio::test]
+async fn invalid_path() {
+    let _ = env_logger::builder().is_test(true).try_init();
+
+    let pki = Pki::load();
+
+    crate::tcp_relay_server::run_app(ServerConfig {
+        tokens: vec![TOKEN.to_string()],
+        tokens_file: None,
+        ports: vec![port(1)],
+        upstream_server: "127.0.0.1".to_string(),
+        listen_address: format!("127.0.0.1:{}", port(0)),
+        increment_ports: 1,
+        tls_cert: Some(BAD_PATH.to_string()),
+        tls_key: Some(pki.localhost_key.file_path()),
+        tls_client_auth_root_cert: None,
+        tls_revocation_list: None,
+    })
+    .await
+    .unwrap_err();
+}

src/test/server_invalid_tls_config_invalid_client_crl.rs

@@ -0,0 +1,78 @@
+use crate::tcp_relay_server::server_config::ServerConfig;
+use crate::test::pki::Pki;
+use crate::test::test_files_utils::create_temp_file_with_random_content;
+use crate::test::{get_port_number, PortsAllocation, BAD_PATH};
+
+const TOKEN: &str = "mytok";
+
+fn port(index: u16) -> u16 {
+    get_port_number(PortsAllocation::TestsWithoutPortOpened, index)
+}
+
+#[tokio::test]
+async fn bad_path() {
+    let _ = env_logger::builder().is_test(true).try_init();
+
+    let pki = Pki::load();
+
+    crate::tcp_relay_server::run_app(ServerConfig {
+        tokens: vec![TOKEN.to_string()],
+        tokens_file: None,
+        ports: vec![port(1)],
+        upstream_server: "127.0.0.1".to_string(),
+        listen_address: format!("127.0.0.1:{}", port(0)),
+        increment_ports: 1,
+        tls_cert: Some(pki.localhost_crt.file_path()),
+        tls_key: Some(pki.localhost_key.file_path()),
+        tls_client_auth_root_cert: Some(pki.root_ca_crl.file_path()),
+        tls_revocation_list: Some(BAD_PATH.to_string()),
+    })
+    .await
+    .unwrap_err();
+}
+
+#[tokio::test]
+async fn random_content() {
+    let _ = env_logger::builder().is_test(true).try_init();
+
+    let pki = Pki::load();
+
+    let random_file = create_temp_file_with_random_content();
+
+    crate::tcp_relay_server::run_app(ServerConfig {
+        tokens: vec![TOKEN.to_string()],
+        tokens_file: None,
+        ports: vec![port(1)],
+        upstream_server: "127.0.0.1".to_string(),
+        listen_address: format!("127.0.0.1:{}", port(0)),
+        increment_ports: 1,
+        tls_cert: Some(pki.localhost_crt.file_path()),
+        tls_key: Some(pki.localhost_key.file_path()),
+        tls_client_auth_root_cert: Some(pki.root_ca_crl.file_path()),
+        tls_revocation_list: Some(random_file.to_string_lossy().to_string()),
+    })
+    .await
+    .unwrap_err();
+}
+
+#[tokio::test]
+async fn invalid_pem() {
+    let _ = env_logger::builder().is_test(true).try_init();
+
+    let pki = Pki::load();
+
+    crate::tcp_relay_server::run_app(ServerConfig {
+        tokens: vec![TOKEN.to_string()],
+        tokens_file: None,
+        ports: vec![port(1)],
+        upstream_server: "127.0.0.1".to_string(),
+        listen_address: format!("127.0.0.1:{}", port(0)),
+        increment_ports: 1,
+        tls_cert: Some(pki.localhost_crt.file_path()),
+        tls_key: Some(pki.localhost_key.file_path()),
+        tls_client_auth_root_cert: Some(pki.root_ca_crl.file_path()),
+        tls_revocation_list: Some(pki.root_ca_crt.file_path()),
+    })
+    .await
+    .unwrap_err();
+}

src/test/server_invalid_tls_config_invalid_client_root_cert.rs

@@ -0,0 +1,78 @@
+use crate::tcp_relay_server::server_config::ServerConfig;
+use crate::test::pki::Pki;
+use crate::test::test_files_utils::create_temp_file_with_random_content;
+use crate::test::{get_port_number, PortsAllocation, BAD_PATH};
+
+const TOKEN: &str = "mytok";
+
+fn port(index: u16) -> u16 {
+    get_port_number(PortsAllocation::TestsWithoutPortOpened, index)
+}
+
+#[tokio::test]
+async fn invalid_path() {
+    let _ = env_logger::builder().is_test(true).try_init();
+
+    let pki = Pki::load();
+
+    crate::tcp_relay_server::run_app(ServerConfig {
+        tokens: vec![TOKEN.to_string()],
+        tokens_file: None,
+        ports: vec![port(1)],
+        upstream_server: "127.0.0.1".to_string(),
+        listen_address: format!("127.0.0.1:{}", port(0)),
+        increment_ports: 1,
+        tls_cert: Some(pki.localhost_crt.file_path()),
+        tls_key: Some(pki.localhost_key.file_path()),
+        tls_client_auth_root_cert: Some(BAD_PATH.to_string()),
+        tls_revocation_list: None,
+    })
+    .await
+    .unwrap_err();
+}
+
+#[tokio::test]
+async fn other_pem_file_type() {
+    let _ = env_logger::builder().is_test(true).try_init();
+
+    let pki = Pki::load();
+
+    crate::tcp_relay_server::run_app(ServerConfig {
+        tokens: vec![TOKEN.to_string()],
+        tokens_file: None,
+        ports: vec![port(1)],
+        upstream_server: "127.0.0.1".to_string(),
+        listen_address: format!("127.0.0.1:{}", port(0)),
+        increment_ports: 1,
+        tls_cert: Some(pki.localhost_crt.file_path()),
+        tls_key: Some(pki.localhost_key.file_path()),
+        tls_client_auth_root_cert: Some(pki.root_ca_crl.file_path()),
+        tls_revocation_list: None,
+    })
+    .await
+    .unwrap_err();
+}
+
+#[tokio::test]
+async fn random_content() {
+    let _ = env_logger::builder().is_test(true).try_init();
+
+    let pki = Pki::load();
+
+    let random_file = create_temp_file_with_random_content();
+
+    crate::tcp_relay_server::run_app(ServerConfig {
+        tokens: vec![TOKEN.to_string()],
+        tokens_file: None,
+        ports: vec![port(1)],
+        upstream_server: "127.0.0.1".to_string(),
+        listen_address: format!("127.0.0.1:{}", port(0)),
+        increment_ports: 1,
+        tls_cert: Some(pki.localhost_crt.file_path()),
+        tls_key: Some(pki.localhost_key.file_path()),
+        tls_client_auth_root_cert: Some(random_file.to_string_lossy().to_string()),
+        tls_revocation_list: None,
+    })
+    .await
+    .unwrap_err();
+}

src/test/server_invalid_tls_config_invalid_key.rs

@@ -0,0 +1,100 @@
+use crate::tcp_relay_server::server_config::ServerConfig;
+use crate::test::pki::Pki;
+use crate::test::test_files_utils::create_temp_file_with_random_content;
+use crate::test::{get_port_number, PortsAllocation, BAD_PATH};
+
+const TOKEN: &str = "mytok";
+
+fn port(index: u16) -> u16 {
+    get_port_number(PortsAllocation::TestsWithoutPortOpened, index)
+}
+
+#[tokio::test]
+async fn invalid_pem_file_type() {
+    let _ = env_logger::builder().is_test(true).try_init();
+
+    let pki = Pki::load();
+
+    crate::tcp_relay_server::run_app(ServerConfig {
+        tokens: vec![TOKEN.to_string()],
+        tokens_file: None,
+        ports: vec![port(1)],
+        upstream_server: "127.0.0.1".to_string(),
+        listen_address: format!("127.0.0.1:{}", port(0)),
+        increment_ports: 1,
+        tls_cert: Some(pki.root_ca_crt.file_path()),
+        tls_key: Some(pki.root_ca_crt.file_path()),
+        tls_client_auth_root_cert: None,
+        tls_revocation_list: None,
+    })
+    .await
+    .unwrap_err();
+}
+
+#[tokio::test()]
+async fn unspecified() {
+    let _ = env_logger::builder().is_test(true).try_init();
+
+    let pki = Pki::load();
+
+    crate::tcp_relay_server::run_app(ServerConfig {
+        tokens: vec![TOKEN.to_string()],
+        tokens_file: None,
+        ports: vec![port(1)],
+        upstream_server: "127.0.0.1".to_string(),
+        listen_address: format!("127.0.0.1:{}", port(0)),
+        increment_ports: 1,
+        tls_cert: Some(pki.root_ca_crt.file_path()),
+        tls_key: None,
+        tls_client_auth_root_cert: None,
+        tls_revocation_list: None,
+    })
+    .await
+    .unwrap_err();
+}
+
+#[tokio::test]
+async fn random_content() {
+    let _ = env_logger::builder().is_test(true).try_init();
+
+    let pki = Pki::load();
+
+    let random_content = create_temp_file_with_random_content();
+
+    crate::tcp_relay_server::run_app(ServerConfig {
+        tokens: vec![TOKEN.to_string()],
+        tokens_file: None,
+        ports: vec![port(1)],
+        upstream_server: "127.0.0.1".to_string(),
+        listen_address: format!("127.0.0.1:{}", port(0)),
+        increment_ports: 1,
+        tls_cert: Some(pki.root_ca_crt.file_path()),
+        tls_key: Some(random_content.to_string_lossy().to_string()),
+        tls_client_auth_root_cert: None,
+        tls_revocation_list: None,
+    })
+    .await
+    .unwrap_err();
+}
+
+#[tokio::test]
+async fn invalid_path() {
+    let _ = env_logger::builder().is_test(true).try_init();
+
+    let pki = Pki::load();
+
+    crate::tcp_relay_server::run_app(ServerConfig {
+        tokens: vec![TOKEN.to_string()],
+        tokens_file: None,
+        ports: vec![port(1)],
+        upstream_server: "127.0.0.1".to_string(),
+        listen_address: format!("127.0.0.1:{}", port(0)),
+        increment_ports: 1,
+        tls_cert: Some(pki.localhost_crt.file_path()),
+        tls_key: Some(BAD_PATH.to_string()),
+        tls_client_auth_root_cert: None,
+        tls_revocation_list: None,
+    })
+    .await
+    .unwrap_err();
+}

src/test/server_invalid_token_file.rs

@@ -0,0 +1,28 @@
+use crate::tcp_relay_server::server_config::ServerConfig;
+use crate::test::{get_port_number, PortsAllocation};
+
+const INVALID_TOKEN: &str = "/tmp/a/token/file/that/does/not/exists";
+
+fn port(index: u16) -> u16 {
+    get_port_number(PortsAllocation::TestsWithoutPortOpened, index)
+}
+
+#[tokio::test()]
+async fn test() {
+    let _ = env_logger::builder().is_test(true).try_init();
+
+    crate::tcp_relay_server::run_app(ServerConfig {
+        tokens: vec![],
+        tokens_file: Some(INVALID_TOKEN.to_string()),
+        ports: vec![port(1)],
+        upstream_server: "127.0.0.1".to_string(),
+        listen_address: format!("127.0.0.1:{}", port(0)),
+        increment_ports: 1,
+        tls_cert: None,
+        tls_key: None,
+        tls_client_auth_root_cert: None,
+        tls_revocation_list: None,
+    })
+    .await
+    .unwrap_err();
+}

src/test/server_missing_auth.rs

@@ -0,0 +1,71 @@
+use crate::tcp_relay_server::server_config::ServerConfig;
+use crate::test::pki::Pki;
+use crate::test::{get_port_number, PortsAllocation};
+
+fn port(index: u16) -> u16 {
+    get_port_number(PortsAllocation::TestsWithoutPortOpened, index)
+}
+
+#[tokio::test]
+async fn with_tls_server() {
+    let _ = env_logger::builder().is_test(true).try_init();
+
+    let pki = Pki::load();
+
+    crate::tcp_relay_server::run_app(ServerConfig {
+        tokens: vec![],
+        tokens_file: None,
+        ports: vec![port(1)],
+        upstream_server: "127.0.0.1".to_string(),
+        listen_address: format!("127.0.0.1:{}", port(0)),
+        increment_ports: 1,
+        tls_cert: Some(pki.root_ca_crl.file_path()),
+        tls_key: Some(pki.localhost_key.file_path()),
+        tls_client_auth_root_cert: None,
+        tls_revocation_list: None,
+    })
+    .await
+    .unwrap_err();
+}
+
+#[tokio::test]
+async fn without_tls_server() {
+    let _ = env_logger::builder().is_test(true).try_init();
+
+    crate::tcp_relay_server::run_app(ServerConfig {
+        tokens: vec![],
+        tokens_file: None,
+        ports: vec![port(1)],
+        upstream_server: "127.0.0.1".to_string(),
+        listen_address: format!("127.0.0.1:{}", port(0)),
+        increment_ports: 1,
+        tls_cert: None,
+        tls_key: None,
+        tls_client_auth_root_cert: None,
+        tls_revocation_list: None,
+    })
+    .await
+    .unwrap_err();
+}
+
+#[tokio::test]
+async fn tls_auth_without_tls_config() {
+    let _ = env_logger::builder().is_test(true).try_init();
+
+    let pki = Pki::load();
+
+    crate::tcp_relay_server::run_app(ServerConfig {
+        tokens: vec![],
+        tokens_file: None,
+        ports: vec![port(1)],
+        upstream_server: "127.0.0.1".to_string(),
+        listen_address: format!("127.0.0.1:{}", port(0)),
+        increment_ports: 1,
+        tls_cert: None,
+        tls_key: None,
+        tls_client_auth_root_cert: Some(pki.root_ca_crt.file_path()),
+        tls_revocation_list: None,
+    })
+    .await
+    .unwrap_err();
+}

src/test/test_files_utils.rs

@@ -0,0 +1,17 @@
+use mktemp::Temp;
+use rand::Rng;
+
+/// Create a temporary file and feed it with some specified content
+pub fn create_temp_file_with_content(content: &[u8]) -> Temp {
+    let temp = Temp::new_file().unwrap();
+    std::fs::write(&temp, content).unwrap();
+    temp
+}
+
+/// Generate a temporary file with some random content
+pub fn create_temp_file_with_random_content() -> Temp {
+    let random_bytes = rand::thread_rng().gen::<[u8; 10]>();
+    let temp = Temp::new_file().unwrap();
+    std::fs::write(&temp, random_bytes).unwrap();
+    temp
+}

src/test/test_pki/ExpiredClient.crt

@@ -0,0 +1,25 @@
+-----BEGIN CERTIFICATE-----
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+AKio0jBH1mENEttHndQhXQkE
+-----END CERTIFICATE-----

src/test/test_pki/ExpiredClient.key

@@ -0,0 +1,27 @@
+-----BEGIN RSA PRIVATE KEY-----
+MIIEpAIBAAKCAQEA0NMicawMnjGr+lKel5MNIToHZn/8dp3RZCRaXrPiTpbm3v3E
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+fpFdGYs8KeohUfw8LSf95VwJwSBb3zjaPPTR/ZZ+LI3k8wStXlOMiQ==
+-----END RSA PRIVATE KEY-----

src/test/test_pki/OtherCA.crl

@@ -0,0 +1,16 @@
+-----BEGIN X509 CRL-----
+MIICgTBrAgEBMA0GCSqGSIb3DQEBCwUAMBIxEDAOBgNVBAMTB090aGVyQ0EXDTIy
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+e5zdMjCWD7b5jfM0GpSthrfh7cya
+-----END X509 CRL-----

src/test/test_pki/OtherCA.crt

@@ -0,0 +1,29 @@
+-----BEGIN CERTIFICATE-----
+MIIE5DCCAsygAwIBAgIBATANBgkqhkiG9w0BAQsFADASMRAwDgYDVQQDEwdPdGhl
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+DE1o4VTfHl8=
+-----END CERTIFICATE-----

src/test/test_pki/OtherCA.key

@@ -0,0 +1,51 @@
+-----BEGIN RSA PRIVATE KEY-----
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+-----END RSA PRIVATE KEY-----

src/test/test_pki/RevokedClient.crt

@@ -0,0 +1,25 @@
+-----BEGIN CERTIFICATE-----
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src/test/test_pki/RevokedClient.key

@@ -0,0 +1,27 @@
+-----BEGIN RSA PRIVATE KEY-----
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+-----END RSA PRIVATE KEY-----

src/test/test_pki/TCPTunnelTestCA.crl

@@ -0,0 +1,17 @@
+-----BEGIN X509 CRL-----
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+-----END X509 CRL-----

src/test/test_pki/TCPTunnelTestCA.crt

@@ -0,0 +1,29 @@
+-----BEGIN CERTIFICATE-----
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src/test/test_pki/TCPTunnelTestCA.key

@@ -0,0 +1,51 @@
+-----BEGIN RSA PRIVATE KEY-----
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+-----END RSA PRIVATE KEY-----

src/test/test_pki/ValidClient.crt

@@ -0,0 +1,25 @@
+-----BEGIN CERTIFICATE-----
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+I5UD0GwVnfUpBTLEpUG4oTH39PhKlncCKtmMnaZiu0DzxMy0xeskFT7YZFj0BKQc
+JXXeqkcOvTFHibpLR5lQ1Q==
+-----END CERTIFICATE-----

src/test/test_pki/ValidClient.key

@@ -0,0 +1,27 @@
+-----BEGIN RSA PRIVATE KEY-----
+MIIEpgIBAAKCAQEAneTyMKf0FAN1FRwxywUGp5Mg0zskMUsykegmzsodoZE7P5e/
+HiNinsKL2ID+KKMEbB2FEzXGRwQSpt3xOgaGTlbkINE8NduqKSeVhDue5z6Hqp/0
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+MdSt2/8yDUFYXn7AzwmvyHzMuDWjccIOuc6o2QIDAQABAoIBAQCdaZfOzFK49S1v
+61j090DIJhVOoaKWhkqXTiQKe1QJNJol7yo5aLu0XW5AXXGFn+gTxWZbXXwcZsIV
+nCUXXVPenB/5W8A0TZgaSX11hF8KWbu1bpyf8kGS8Hvz2IhSIKfG31e8u9iSEdGt
+9YLbq9oEt4ud/qx6cJq0qJ1Kts+Y8ofAXjTqxa0+LVmCPRJFp1CjCAanq/VBx+cR
+TjDMcBAnKB8u1wrMc4Hw8ew693wHaxYQEm1bZkjplQbUCA/IKTr1otIyCHRpNKUJ
+XmNTr+zU0zqjGudeeNrEu8vjXMFzlWXoKlbVoYgfJ7lIp/9s2KDa/AjEpsrbmDo6
+vAsH9gnFAoGBAMOcEd7LQFoIxdNl2BFV4jDoSLrTeNjTwXFfe4/UQSvb8lAwzYl5
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+bXut7GuATOBkpitiAs3AAtFmkSl1bVot0x8H/UB+3rLEB4xNgMYLoQrjXPy5+2k2
+aqWACV7CHtpID6YM18c//IXM7RwREBLoOWB1OgOYZlrMOuf+AcmMQHAFivbvy3Sg
+8kSnhQUmBzNyT2qhID0Yg/irAoGBAIDfAGhjY8kqI8Y7TDOGR5Op7Vdh6s307Rio
+5YeE3k/2p3kFpiIUdSm3fBXjRGvlmF8ZhHxrf8n9MK5Rcn8VUoKfT18vKZ1MYdzq
+ulNxDe9B953IiC7i9oGnTuOB5q/L5OCKjaHpUX3Wok1cjeVVRpLNnHpIFKXg1CL9
+uo5+ecxRAoGBAKUr4pYT8wmu8BoNNoVkn6/c7m7ssBJxRUsj7cjxNpCIXzUKMzDj
+Vqup7ex/tVOXZ10JEE96IMvm+b+Dje32x5oP2qaMYAlAhxJd6P0+5C7eRhZnwqYa
+n82eXRq0ij6ggvXHvfhxgpa51hCRtEv6MGNu5qJ9QGKxb8VAFbQT3vPI
+-----END RSA PRIVATE KEY-----

src/test/test_pki/localhost.crt

@@ -0,0 +1,25 @@
+-----BEGIN CERTIFICATE-----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+-----END CERTIFICATE-----

src/test/test_pki/localhost.key

@@ -0,0 +1,27 @@
+-----BEGIN RSA PRIVATE KEY-----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+-----END RSA PRIVATE KEY-----

src/test/tls_auth_expired_certificate.rs

@@ -0,0 +1,58 @@
+use tokio::task;
+
+use crate::tcp_relay_client::client_config::ClientConfig;
+use crate::tcp_relay_server::server_config::ServerConfig;
+use crate::test::dummy_tcp_sockets::{wait_for_port, DummyTCPServer};
+use crate::test::pki::Pki;
+use crate::test::{get_port_number, PortsAllocation, LOCALHOST_IP};
+
+fn port(index: u16) -> u16 {
+    get_port_number(PortsAllocation::TlsAuthExpiredClientCertificate, index)
+}
+
+#[tokio::test]
+async fn test() {
+    let _ = env_logger::builder().is_test(true).try_init();
+
+    // Start internal service
+    let local_server = DummyTCPServer::start(port(1)).await;
+    tokio::spawn(async move {
+        local_server.loop_conn_square_operations().await;
+    });
+
+    let pki = Pki::load();
+
+    let local_set = task::LocalSet::new();
+    local_set
+        .run_until(async move {
+            wait_for_port(port(1)).await;
+
+            // Start server relay
+            task::spawn_local(crate::tcp_relay_server::run_app(ServerConfig {
+                tokens: vec![],
+                tokens_file: None,
+                ports: vec![port(1)],
+                upstream_server: "127.0.0.1".to_string(),
+                listen_address: format!("127.0.0.1:{}", port(0)),
+                increment_ports: 1,
+                tls_cert: Some(pki.localhost_crt.file_path()),
+                tls_key: Some(pki.localhost_key.file_path()),
+                tls_client_auth_root_cert: Some(pki.root_ca_crt.file_path()),
+                tls_revocation_list: Some(pki.root_ca_crl.file_path()),
+            }));
+            wait_for_port(port(0)).await;
+
+            // Start client relay
+            crate::tcp_relay_client::run_app(ClientConfig {
+                relay_url: format!("https://localhost:{}", port(0)),
+                listen_address: LOCALHOST_IP.to_string(),
+                root_certificate: Some(pki.root_ca_crt.file_path()),
+                tls_cert: Some(pki.expired_client_crt.file_path()),
+                tls_key: Some(pki.valid_client_key.file_path()),
+                ..Default::default()
+            })
+            .await
+            .unwrap_err();
+        })
+        .await;
+}

src/test/tls_auth_invalid_certificate.rs

@@ -0,0 +1,58 @@
+use tokio::task;
+
+use crate::tcp_relay_client::client_config::ClientConfig;
+use crate::tcp_relay_server::server_config::ServerConfig;
+use crate::test::dummy_tcp_sockets::{wait_for_port, DummyTCPServer};
+use crate::test::pki::Pki;
+use crate::test::{get_port_number, PortsAllocation, LOCALHOST_IP};
+
+fn port(index: u16) -> u16 {
+    get_port_number(PortsAllocation::TlsAuthInvalidClientCertificate, index)
+}
+
+#[tokio::test]
+async fn test() {
+    let _ = env_logger::builder().is_test(true).try_init();
+
+    // Start internal service
+    let local_server = DummyTCPServer::start(port(1)).await;
+    tokio::spawn(async move {
+        local_server.loop_conn_square_operations().await;
+    });
+
+    let pki = Pki::load();
+
+    let local_set = task::LocalSet::new();
+    local_set
+        .run_until(async move {
+            wait_for_port(port(1)).await;
+
+            // Start server relay
+            task::spawn_local(crate::tcp_relay_server::run_app(ServerConfig {
+                tokens: vec![],
+                tokens_file: None,
+                ports: vec![port(1)],
+                upstream_server: "127.0.0.1".to_string(),
+                listen_address: format!("127.0.0.1:{}", port(0)),
+                increment_ports: 1,
+                tls_cert: Some(pki.localhost_crt.file_path()),
+                tls_key: Some(pki.localhost_key.file_path()),
+                tls_client_auth_root_cert: Some(pki.other_ca_crt.file_path()),
+                tls_revocation_list: Some(pki.other_ca_crl.file_path()),
+            }));
+            wait_for_port(port(0)).await;
+
+            // Start client relay
+            crate::tcp_relay_client::run_app(ClientConfig {
+                relay_url: format!("https://localhost:{}", port(0)),
+                listen_address: LOCALHOST_IP.to_string(),
+                root_certificate: Some(pki.root_ca_crt.file_path()),
+                tls_cert: Some(pki.revoked_client_crt.file_path()),
+                tls_key: Some(pki.revoked_client_key.file_path()),
+                ..Default::default()
+            })
+            .await
+            .unwrap_err();
+        })
+        .await;
+}

src/test/tls_auth_revoked_certificate.rs

@@ -0,0 +1,58 @@
+use tokio::task;
+
+use crate::tcp_relay_client::client_config::ClientConfig;
+use crate::tcp_relay_server::server_config::ServerConfig;
+use crate::test::dummy_tcp_sockets::{wait_for_port, DummyTCPServer};
+use crate::test::pki::Pki;
+use crate::test::{get_port_number, PortsAllocation, LOCALHOST_IP};
+
+fn port(index: u16) -> u16 {
+    get_port_number(PortsAllocation::TlsAuthRevokedClientCertificate, index)
+}
+
+#[tokio::test]
+async fn test() {
+    let _ = env_logger::builder().is_test(true).try_init();
+
+    // Start internal service
+    let local_server = DummyTCPServer::start(port(1)).await;
+    tokio::spawn(async move {
+        local_server.loop_conn_square_operations().await;
+    });
+
+    let pki = Pki::load();
+
+    let local_set = task::LocalSet::new();
+    local_set
+        .run_until(async move {
+            wait_for_port(port(1)).await;
+
+            // Start server relay
+            task::spawn_local(crate::tcp_relay_server::run_app(ServerConfig {
+                tokens: vec![],
+                tokens_file: None,
+                ports: vec![port(1)],
+                upstream_server: "127.0.0.1".to_string(),
+                listen_address: format!("127.0.0.1:{}", port(0)),
+                increment_ports: 1,
+                tls_cert: Some(pki.localhost_crt.file_path()),
+                tls_key: Some(pki.localhost_key.file_path()),
+                tls_client_auth_root_cert: Some(pki.root_ca_crt.file_path()),
+                tls_revocation_list: Some(pki.root_ca_crl.file_path()),
+            }));
+            wait_for_port(port(0)).await;
+
+            // Start client relay
+            crate::tcp_relay_client::run_app(ClientConfig {
+                relay_url: format!("https://localhost:{}", port(0)),
+                listen_address: LOCALHOST_IP.to_string(),
+                root_certificate: Some(pki.root_ca_crt.file_path()),
+                tls_cert: Some(pki.revoked_client_crt.file_path()),
+                tls_key: Some(pki.revoked_client_key.file_path()),
+                ..Default::default()
+            })
+            .await
+            .unwrap_err();
+        })
+        .await;
+}

src/test/valid_token_with_custom_increment.rs

@@ -0,0 +1,59 @@
+use tokio::task;
+
+use crate::tcp_relay_client::client_config::ClientConfig;
+use crate::tcp_relay_server::server_config::ServerConfig;
+use crate::test::dummy_tcp_sockets::{
+    dummy_tcp_client_square_root_requests, wait_for_port, DummyTCPServer,
+};
+use crate::test::{get_port_number, PortsAllocation, LOCALHOST_IP};
+
+const VALID_TOKEN: &str = "AvalidTOKEN";
+
+fn port(index: u16) -> u16 {
+    get_port_number(PortsAllocation::ValidTokenWithCustomIncrement, index)
+}
+
+#[tokio::test()]
+async fn test() {
+    let _ = env_logger::builder().is_test(true).try_init();
+
+    // Start internal service
+    let local_server = DummyTCPServer::start(port(1)).await;
+    tokio::spawn(async move {
+        local_server.loop_conn_square_operations().await;
+    });
+
+    let local_set = task::LocalSet::new();
+    local_set
+        .run_until(async move {
+            wait_for_port(port(1)).await;
+
+            // Start server relay
+            task::spawn_local(crate::tcp_relay_server::run_app(ServerConfig {
+                tokens: vec![VALID_TOKEN.to_string()],
+                tokens_file: None,
+                ports: vec![port(1)],
+                upstream_server: "127.0.0.1".to_string(),
+                listen_address: format!("127.0.0.1:{}", port(0)),
+                increment_ports: 3,
+                tls_cert: None,
+                tls_key: None,
+                tls_client_auth_root_cert: None,
+                tls_revocation_list: None,
+            }));
+            wait_for_port(port(0)).await;
+
+            // Start client relay
+            task::spawn(crate::tcp_relay_client::run_app(ClientConfig {
+                token: Some(VALID_TOKEN.to_string()),
+                relay_url: format!("http://{}:{}", LOCALHOST_IP, port(0)),
+                listen_address: LOCALHOST_IP.to_string(),
+                root_certificate: None,
+                ..Default::default()
+            }));
+            wait_for_port(port(4)).await;
+
+            dummy_tcp_client_square_root_requests(port(4), 10).await;
+        })
+        .await;
+}

src/test/valid_with_multiple_token_auth.rs

@@ -0,0 +1,63 @@
+use tokio::task;
+
+use crate::tcp_relay_client::client_config::ClientConfig;
+use crate::tcp_relay_server::server_config::ServerConfig;
+use crate::test::dummy_tcp_sockets::{
+    dummy_tcp_client_square_root_requests, wait_for_port, DummyTCPServer,
+};
+use crate::test::{get_port_number, PortsAllocation, LOCALHOST_IP};
+
+const VALID_TOKEN: &str = "AvalidTOKEN";
+
+fn port(index: u16) -> u16 {
+    get_port_number(PortsAllocation::ValidWithTokenFile, index)
+}
+
+#[tokio::test()]
+async fn valid_with_multiple_token_auth() {
+    let _ = env_logger::builder().is_test(true).try_init();
+
+    // Start internal service
+    let local_server = DummyTCPServer::start(port(1)).await;
+    tokio::spawn(async move {
+        local_server.loop_conn_square_operations().await;
+    });
+
+    let local_set = task::LocalSet::new();
+    local_set
+        .run_until(async move {
+            wait_for_port(port(1)).await;
+
+            // Start server relay
+            task::spawn_local(crate::tcp_relay_server::run_app(ServerConfig {
+                tokens: vec![
+                    "tok0".to_string(),
+                    VALID_TOKEN.to_string(),
+                    "tok2".to_string(),
+                ],
+                tokens_file: None,
+                ports: vec![port(1)],
+                upstream_server: "127.0.0.1".to_string(),
+                listen_address: format!("127.0.0.1:{}", port(0)),
+                increment_ports: 1,
+                tls_cert: None,
+                tls_key: None,
+                tls_client_auth_root_cert: None,
+                tls_revocation_list: None,
+            }));
+            wait_for_port(port(0)).await;
+
+            // Start client relay
+            task::spawn(crate::tcp_relay_client::run_app(ClientConfig {
+                token: Some(VALID_TOKEN.to_string()),
+                relay_url: format!("http://{}:{}", LOCALHOST_IP, port(0)),
+                listen_address: LOCALHOST_IP.to_string(),
+                root_certificate: None,
+                ..Default::default()
+            }));
+            wait_for_port(port(2)).await;
+
+            dummy_tcp_client_square_root_requests(port(2), 10).await;
+        })
+        .await;
+}

src/test/valid_with_tls_auth.rs

@@ -0,0 +1,61 @@
+use tokio::task;
+
+use crate::tcp_relay_client::client_config::ClientConfig;
+use crate::tcp_relay_server::server_config::ServerConfig;
+use crate::test::dummy_tcp_sockets::{
+    dummy_tcp_client_square_root_requests, wait_for_port, DummyTCPServer,
+};
+use crate::test::pki::Pki;
+use crate::test::{get_port_number, PortsAllocation, LOCALHOST_IP};
+
+fn port(index: u16) -> u16 {
+    get_port_number(PortsAllocation::ValidWithTLSAuth, index)
+}
+
+#[tokio::test]
+async fn test() {
+    let _ = env_logger::builder().is_test(true).try_init();
+
+    // Start internal service
+    let local_server = DummyTCPServer::start(port(1)).await;
+    tokio::spawn(async move {
+        local_server.loop_conn_square_operations().await;
+    });
+
+    let pki = Pki::load();
+
+    let local_set = task::LocalSet::new();
+    local_set
+        .run_until(async move {
+            wait_for_port(port(1)).await;
+
+            // Start server relay
+            task::spawn_local(crate::tcp_relay_server::run_app(ServerConfig {
+                tokens: vec![],
+                tokens_file: None,
+                ports: vec![port(1)],
+                upstream_server: "127.0.0.1".to_string(),
+                listen_address: format!("127.0.0.1:{}", port(0)),
+                increment_ports: 1,
+                tls_cert: Some(pki.localhost_crt.file_path()),
+                tls_key: Some(pki.localhost_key.file_path()),
+                tls_client_auth_root_cert: Some(pki.root_ca_crt.file_path()),
+                tls_revocation_list: Some(pki.root_ca_crl.file_path()),
+            }));
+            wait_for_port(port(0)).await;
+
+            // Start client relay
+            task::spawn(crate::tcp_relay_client::run_app(ClientConfig {
+                relay_url: format!("https://localhost:{}", port(0)),
+                listen_address: LOCALHOST_IP.to_string(),
+                root_certificate: Some(pki.root_ca_crt.file_path()),
+                tls_cert: Some(pki.valid_client_crt.file_path()),
+                tls_key: Some(pki.valid_client_key.file_path()),
+                ..Default::default()
+            }));
+            wait_for_port(port(2)).await;
+
+            dummy_tcp_client_square_root_requests(port(2), 10).await;
+        })
+        .await;
+}

src/test/valid_with_token_auth.rs

@@ -0,0 +1,59 @@
+use tokio::task;
+
+use crate::tcp_relay_client::client_config::ClientConfig;
+use crate::tcp_relay_server::server_config::ServerConfig;
+use crate::test::dummy_tcp_sockets::{
+    dummy_tcp_client_square_root_requests, wait_for_port, DummyTCPServer,
+};
+use crate::test::{get_port_number, PortsAllocation, LOCALHOST_IP};
+
+const VALID_TOKEN: &str = "AvalidTOKEN";
+
+fn port(index: u16) -> u16 {
+    get_port_number(PortsAllocation::ValidWithTokenAuth, index)
+}
+
+#[tokio::test()]
+async fn valid_with_token_auth() {
+    let _ = env_logger::builder().is_test(true).try_init();
+
+    // Start internal service
+    let local_server = DummyTCPServer::start(port(1)).await;
+    tokio::spawn(async move {
+        local_server.loop_conn_square_operations().await;
+    });
+
+    let local_set = task::LocalSet::new();
+    local_set
+        .run_until(async move {
+            wait_for_port(port(1)).await;
+
+            // Start server relay
+            task::spawn_local(crate::tcp_relay_server::run_app(ServerConfig {
+                tokens: vec![VALID_TOKEN.to_string()],
+                tokens_file: None,
+                ports: vec![port(1)],
+                upstream_server: "127.0.0.1".to_string(),
+                listen_address: format!("127.0.0.1:{}", port(0)),
+                increment_ports: 1,
+                tls_cert: None,
+                tls_key: None,
+                tls_client_auth_root_cert: None,
+                tls_revocation_list: None,
+            }));
+            wait_for_port(port(0)).await;
+
+            // Start client relay
+            task::spawn(crate::tcp_relay_client::run_app(ClientConfig {
+                token: Some(VALID_TOKEN.to_string()),
+                relay_url: format!("http://{}:{}", LOCALHOST_IP, port(0)),
+                listen_address: LOCALHOST_IP.to_string(),
+                root_certificate: None,
+                ..Default::default()
+            }));
+            wait_for_port(port(2)).await;
+
+            dummy_tcp_client_square_root_requests(port(2), 10).await;
+        })
+        .await;
+}

src/test/valid_with_token_auth_and_server_tls.rs

@@ -0,0 +1,62 @@
+use tokio::task;
+
+use crate::tcp_relay_client::client_config::ClientConfig;
+use crate::tcp_relay_server::server_config::ServerConfig;
+use crate::test::dummy_tcp_sockets::{
+    dummy_tcp_client_square_root_requests, wait_for_port, DummyTCPServer,
+};
+use crate::test::pki::Pki;
+use crate::test::{get_port_number, PortsAllocation, LOCALHOST_IP};
+
+const VALID_TOKEN: &str = "AvalidTOKEN";
+
+fn port(index: u16) -> u16 {
+    get_port_number(PortsAllocation::ValidWithTokenAuthAndServerTLS, index)
+}
+
+#[tokio::test()]
+async fn test() {
+    let _ = env_logger::builder().is_test(true).try_init();
+
+    // Start internal service
+    let local_server = DummyTCPServer::start(port(1)).await;
+    tokio::spawn(async move {
+        local_server.loop_conn_square_operations().await;
+    });
+
+    let pki = Pki::load();
+
+    let local_set = task::LocalSet::new();
+    local_set
+        .run_until(async move {
+            wait_for_port(port(1)).await;
+
+            // Start server relay
+            task::spawn_local(crate::tcp_relay_server::run_app(ServerConfig {
+                tokens: vec![VALID_TOKEN.to_string()],
+                tokens_file: None,
+                ports: vec![port(1)],
+                upstream_server: "127.0.0.1".to_string(),
+                listen_address: format!("127.0.0.1:{}", port(0)),
+                increment_ports: 1,
+                tls_cert: Some(pki.localhost_crt.file_path()),
+                tls_key: Some(pki.localhost_key.file_path()),
+                tls_client_auth_root_cert: None,
+                tls_revocation_list: None,
+            }));
+            wait_for_port(port(0)).await;
+
+            // Start client relay
+            task::spawn(crate::tcp_relay_client::run_app(ClientConfig {
+                token: Some(VALID_TOKEN.to_string()),
+                relay_url: format!("https://localhost:{}", port(0)),
+                listen_address: LOCALHOST_IP.to_string(),
+                root_certificate: Some(pki.root_ca_crt.file_path()),
+                ..Default::default()
+            }));
+            wait_for_port(port(2)).await;
+
+            dummy_tcp_client_square_root_requests(port(2), 10).await;
+        })
+        .await;
+}

src/test/valid_with_token_auth_multiple_ports.rs

@@ -0,0 +1,67 @@
+use tokio::task;
+
+use crate::tcp_relay_client::client_config::ClientConfig;
+use crate::tcp_relay_server::server_config::ServerConfig;
+use crate::test::dummy_tcp_sockets::{
+    dummy_tcp_client_additions_requests, dummy_tcp_client_square_root_requests, wait_for_port,
+    DummyTCPServer,
+};
+use crate::test::{get_port_number, PortsAllocation, LOCALHOST_IP};
+
+const VALID_TOKEN: &str = "AvalidTOKEN";
+const NUM_INC: i32 = 5;
+
+fn port(index: u16) -> u16 {
+    get_port_number(PortsAllocation::ValidWithTokenAuthMultiplePorts, index)
+}
+
+#[tokio::test()]
+async fn test() {
+    let _ = env_logger::builder().is_test(true).try_init();
+
+    // Start internal services
+    let local_server_1 = DummyTCPServer::start(port(1)).await;
+    tokio::spawn(async move {
+        local_server_1.loop_conn_square_operations().await;
+    });
+
+    let local_server_2 = DummyTCPServer::start(port(3)).await;
+    tokio::spawn(async move {
+        local_server_2.loop_next_conn_add_operations(NUM_INC).await;
+    });
+
+    let local_set = task::LocalSet::new();
+    local_set
+        .run_until(async move {
+            wait_for_port(port(1)).await;
+
+            // Start server relay
+            task::spawn_local(crate::tcp_relay_server::run_app(ServerConfig {
+                tokens: vec![VALID_TOKEN.to_string()],
+                tokens_file: None,
+                ports: vec![port(1), port(3)],
+                upstream_server: "127.0.0.1".to_string(),
+                listen_address: format!("127.0.0.1:{}", port(0)),
+                increment_ports: 1,
+                tls_cert: None,
+                tls_key: None,
+                tls_client_auth_root_cert: None,
+                tls_revocation_list: None,
+            }));
+            wait_for_port(port(0)).await;
+
+            // Start client relay
+            task::spawn(crate::tcp_relay_client::run_app(ClientConfig {
+                token: Some(VALID_TOKEN.to_string()),
+                relay_url: format!("http://{}:{}", LOCALHOST_IP, port(0)),
+                listen_address: LOCALHOST_IP.to_string(),
+                root_certificate: None,
+                ..Default::default()
+            }));
+            wait_for_port(port(2)).await;
+
+            dummy_tcp_client_square_root_requests(port(2), 10).await;
+            dummy_tcp_client_additions_requests(port(4), NUM_INC, 10).await;
+        })
+        .await;
+}

src/test/valid_with_token_file.rs

@@ -0,0 +1,62 @@
+use tokio::task;
+
+use crate::tcp_relay_client::client_config::ClientConfig;
+use crate::tcp_relay_server::server_config::ServerConfig;
+use crate::test::dummy_tcp_sockets::{
+    dummy_tcp_client_square_root_requests, wait_for_port, DummyTCPServer,
+};
+use crate::test::{get_port_number, PortsAllocation, LOCALHOST_IP};
+
+const VALID_TOKEN: &str = "AvalidTOKEN";
+
+fn port(index: u16) -> u16 {
+    get_port_number(PortsAllocation::ValidWithMultipleTokenAuth, index)
+}
+
+#[tokio::test()]
+async fn valid_with_token_file() {
+    let _ = env_logger::builder().is_test(true).try_init();
+
+    // Start internal service
+    let local_server = DummyTCPServer::start(port(1)).await;
+    tokio::spawn(async move {
+        local_server.loop_conn_square_operations().await;
+    });
+
+    let local_set = task::LocalSet::new();
+    local_set
+        .run_until(async move {
+            wait_for_port(port(1)).await;
+
+            let token_file = mktemp::Temp::new_file().unwrap();
+            std::fs::write(&token_file, format!("tok1\ntok2\n{}\ntok4", VALID_TOKEN)).unwrap();
+
+            // Start server relay
+            task::spawn_local(crate::tcp_relay_server::run_app(ServerConfig {
+                tokens: vec![],
+                tokens_file: Some(token_file.to_str().unwrap().to_string()),
+                ports: vec![port(1)],
+                upstream_server: "127.0.0.1".to_string(),
+                listen_address: format!("127.0.0.1:{}", port(0)),
+                increment_ports: 1,
+                tls_cert: None,
+                tls_key: None,
+                tls_client_auth_root_cert: None,
+                tls_revocation_list: None,
+            }));
+            wait_for_port(port(0)).await;
+
+            // Start client relay
+            task::spawn(crate::tcp_relay_client::run_app(ClientConfig {
+                token: Some(VALID_TOKEN.to_string()),
+                relay_url: format!("http://{}:{}", LOCALHOST_IP, port(0)),
+                listen_address: LOCALHOST_IP.to_string(),
+                root_certificate: None,
+                ..Default::default()
+            }));
+            wait_for_port(port(2)).await;
+
+            dummy_tcp_client_square_root_requests(port(2), 10).await;
+        })
+        .await;
+}

src/test/with_token_auth_and_invalid_server_tls_bad_ca.rs

@@ -0,0 +1,54 @@
+use tokio::task;
+
+use crate::tcp_relay_client::client_config::ClientConfig;
+use crate::tcp_relay_server::server_config::ServerConfig;
+use crate::test::dummy_tcp_sockets::wait_for_port;
+use crate::test::pki::Pki;
+use crate::test::{get_port_number, PortsAllocation, LOCALHOST_IP};
+
+const VALID_TOKEN: &str = "AvalidTOKEN";
+
+fn port(index: u16) -> u16 {
+    get_port_number(
+        PortsAllocation::WithTokenAuthAndInvalidServerTLSBadCA,
+        index,
+    )
+}
+
+#[tokio::test()]
+async fn test() {
+    let _ = env_logger::builder().is_test(true).try_init();
+
+    let pki = Pki::load();
+
+    let local_set = task::LocalSet::new();
+    local_set
+        .run_until(async move {
+            // Start server relay
+            task::spawn_local(crate::tcp_relay_server::run_app(ServerConfig {
+                tokens: vec![VALID_TOKEN.to_string()],
+                tokens_file: None,
+                ports: vec![port(1)],
+                upstream_server: "127.0.0.1".to_string(),
+                listen_address: format!("127.0.0.1:{}", port(0)),
+                increment_ports: 1,
+                tls_cert: Some(pki.localhost_crt.file_path()),
+                tls_key: Some(pki.localhost_key.file_path()),
+                tls_client_auth_root_cert: None,
+                tls_revocation_list: None,
+            }));
+            wait_for_port(port(0)).await;
+
+            // Start client relay
+            crate::tcp_relay_client::run_app(ClientConfig {
+                token: Some(VALID_TOKEN.to_string()),
+                relay_url: format!("https://localhost:{}", port(0)),
+                listen_address: LOCALHOST_IP.to_string(),
+                root_certificate: Some(pki.other_ca_crt.file_path()),
+                ..Default::default()
+            })
+            .await
+            .unwrap_err();
+        })
+        .await;
+}

src/test/with_token_auth_and_invalid_server_tls_expired_and_bad_cn.rs

@@ -0,0 +1,54 @@
+use tokio::task;
+
+use crate::tcp_relay_client::client_config::ClientConfig;
+use crate::tcp_relay_server::server_config::ServerConfig;
+use crate::test::dummy_tcp_sockets::wait_for_port;
+use crate::test::pki::Pki;
+use crate::test::{get_port_number, PortsAllocation, LOCALHOST_IP};
+
+const VALID_TOKEN: &str = "AvalidTOKEN";
+
+fn port(index: u16) -> u16 {
+    get_port_number(
+        PortsAllocation::WithTokenAuthAndInvalidServerTLSExpiredAndBadCN,
+        index,
+    )
+}
+
+#[tokio::test()]
+async fn test() {
+    let _ = env_logger::builder().is_test(true).try_init();
+
+    let pki = Pki::load();
+
+    let local_set = task::LocalSet::new();
+    local_set
+        .run_until(async move {
+            // Start server relay
+            task::spawn_local(crate::tcp_relay_server::run_app(ServerConfig {
+                tokens: vec![VALID_TOKEN.to_string()],
+                tokens_file: None,
+                ports: vec![port(1)],
+                upstream_server: "127.0.0.1".to_string(),
+                listen_address: format!("127.0.0.1:{}", port(0)),
+                increment_ports: 1,
+                tls_cert: Some(pki.expired_client_crt.file_path()),
+                tls_key: Some(pki.expired_client_key.file_path()),
+                tls_client_auth_root_cert: None,
+                tls_revocation_list: None,
+            }));
+            wait_for_port(port(0)).await;
+
+            // Start client relay
+            crate::tcp_relay_client::run_app(ClientConfig {
+                token: Some(VALID_TOKEN.to_string()),
+                relay_url: format!("https://localhost:{}", port(0)),
+                listen_address: LOCALHOST_IP.to_string(),
+                root_certificate: Some(pki.root_ca_crt.file_path()),
+                ..Default::default()
+            })
+            .await
+            .unwrap_err();
+        })
+        .await;
+}

tcp_relay_client/Cargo.toml

@@ -1,15 +0,0 @@
-[package]
-name = "tcp_relay_client"
-version = "0.1.0"
-edition = "2021"
-
-[dependencies]
-base = { path = "../base" }
-clap = { version = "3.2.18", features = ["derive", "env"] }
-log = "0.4.17"
-env_logger = "0.9.0"
-reqwest = { version = "0.11", features = ["json"] }
-tokio = { version = "1", features = ["full"] }
-futures = "0.3.24"
-tokio-tungstenite = "0.17.2"
-urlencoding = "2.1.0"

tcp_relay_client/src/lib.rs

@@ -1 +0,0 @@
-pub mod relay_client;

tcp_relay_client/src/main.rs

@@ -1,64 +0,0 @@
-use std::sync::Arc;
-
-use clap::Parser;
-use futures::future::join_all;
-
-use base::RemoteConfig;
-use tcp_relay_client::relay_client::relay_client;
-
-/// TCP relay client
-#[derive(Parser, Debug, Clone)]
-#[clap(author, version, about, long_about = None)]
-pub struct Args {
-    /// Access token
-    #[clap(short, long)]
-    pub token: String,
-
-    /// Relay server
-    #[clap(short, long, default_value = "http://127.0.0.1:8000")]
-    pub relay_url: String,
-
-    /// Listen address
-    #[clap(short, long, default_value = "127.0.0.1")]
-    pub listen_address: String,
-}
-
-#[tokio::main]
-async fn main() -> Result<(), Box<dyn std::error::Error>> {
-    env_logger::init_from_env(env_logger::Env::new().default_filter_or("info"));
-
-    let args: Args = Args::parse();
-    let args = Arc::new(args);
-
-    // Get server relay configuration (fetch the list of port to forward)
-    let url = format!("{}/config", args.relay_url);
-    log::info!("Retrieving configuration on {}", url);
-    let req = reqwest::Client::new().get(url)
-        .header("Authorization", format!("Bearer {}", args.token))
-        .send()
-        .await?;
-    if req.status().as_u16() != 200 {
-        log::error!("Could not retrieve configuration! (got status {})", req.status());
-        std::process::exit(2);
-    }
-    let conf = req.json::<RemoteConfig>()
-        .await?;
-
-    // Start to listen port
-    let mut handles = vec![];
-    for port in conf {
-        let listen_address = format!("{}:{}", args.listen_address, port.port);
-
-        let h = tokio::spawn(relay_client(
-            format!("{}/ws?id={}&token={}",
-                    args.relay_url, port.id, urlencoding::encode(&args.token))
-                .replace("http", "ws"),
-            listen_address,
-        ));
-        handles.push(h);
-    }
-
-    join_all(handles).await;
-
-    Ok(())
-}

tcp_relay_client/src/relay_client.rs

@@ -1,87 +0,0 @@
-use futures::{SinkExt, StreamExt};
-use tokio::io::{AsyncReadExt, AsyncWriteExt};
-use tokio::net::{TcpListener, TcpStream};
-use tokio_tungstenite::tungstenite::Message;
-
-pub async fn relay_client(ws_url: String, listen_address: String) {
-    log::info!("Start to listen on {}", listen_address);
-    let listener = match TcpListener::bind(&listen_address).await {
-        Ok(l) => l,
-        Err(e) => {
-            log::error!("Failed to start to listen on {}! {}", listen_address, e);
-            std::process::exit(3);
-        }
-    };
-
-    loop {
-        let (socket, _) = listener.accept().await
-            .expect("Failed to accept new connection!");
-
-        tokio::spawn(relay_connection(ws_url.clone(), socket));
-    }
-}
-
-/// Relay connection
-///
-/// WS read => TCP write
-/// TCP read => WS write
-async fn relay_connection(ws_url: String, socket: TcpStream) {
-    log::debug!("Connecting to {}...", ws_url);
-    let (ws_stream, _) = tokio_tungstenite::connect_async(ws_url)
-        .await.expect("Failed to connect to server relay!");
-
-
-    let (mut tcp_read, mut tcp_write) = socket.into_split();
-    let (mut ws_write, mut ws_read) =
-        ws_stream.split();
-
-    // TCP read -> WS write
-    let future = async move {
-        let mut buff: [u8; 5000] = [0; 5000];
-        loop {
-            match tcp_read.read(&mut buff).await {
-                Ok(s) => {
-                    if let Err(e) = ws_write.send(Message::Binary(Vec::from(&buff[0..s]))).await {
-                        log::error!(
-                            "Failed to write to WS connection! {:?} Exiting TCP read -> WS write loop...",e);
-                        break;
-                    }
-
-                    if s == 0 {
-                        log::info!("Got empty read TCP buffer. Stopping...");
-                        break;
-                    }
-                }
-                Err(e) => {
-                    log::error!(
-                        "Failed to read from TCP connection! {:?} Exitin TCP read -> WS write loop...",
-                        e
-                    );
-                    break;
-                }
-            }
-        }
-    };
-    tokio::spawn(future);
-
-    // WS read -> TCP write
-    while let Some(m) = ws_read.next().await {
-        match m {
-            Err(e) => {
-                log::error!("Failed to read from WebSocket. Breaking read loop... {:?}", e);
-                break;
-            }
-            Ok(Message::Binary(b)) => {
-                if let Err(e) = tcp_write.write_all(&b).await {
-                    log::error!("Failed to forward message to websocket. Closing reading end... {:?}", e);
-                    break;
-                };
-            }
-            Ok(Message::Close(_r)) => {
-                log::info!("Server asked to close this WebSocket connection");
-                break;
-            }
-            Ok(m) => log::info!("{:?}", m)
-        }
-    }
-}

tcp_relay_server/Cargo.toml

@@ -1,16 +0,0 @@
-[package]
-name = "tcp_relay_server"
-version = "0.1.0"
-edition = "2021"
-
-[dependencies]
-base = { path = "../base" }
-clap = { version = "3.2.18", features = ["derive", "env"] }
-log = "0.4.17"
-env_logger = "0.9.0"
-actix = "0.13.0"
-actix-web = "4"
-actix-web-actors = "4.1.0"
-serde = { version = "1.0.144", features = ["derive"] }
-tokio = { version = "1", features = ["full"] }
-futures = "0.3.24"

tcp_relay_server/src/args.rs

@@ -1,31 +0,0 @@
-use clap::Parser;
-
-/// TCP relay server
-#[derive(Parser, Debug, Clone)]
-#[clap(author, version, about, long_about = None)]
-pub struct Args {
-    /// Access tokens
-    #[clap(short, long)]
-    pub tokens: Vec<String>,
-
-    /// Access tokens stored in a file, one token per line
-    #[clap(long)]
-    pub tokens_file: Option<String>,
-
-    /// Forwarded ports
-    #[clap(short, long)]
-    pub ports: Vec<u16>,
-
-    /// Upstream server
-    #[clap(short, long, default_value = "127.0.0.1")]
-    pub upstream_server: String,
-
-    /// HTTP server listen address
-    #[clap(short, long, default_value = "0.0.0.0:8000")]
-    pub listen_address: String,
-
-    /// Increment ports on client. Useful for debugging and running both client and server
-    /// on the same machine
-    #[clap(short, long, default_value_t = 0)]
-    pub increment_ports: u16,
-}

tcp_relay_server/src/lib.rs

@@ -1,2 +0,0 @@
-pub mod args;
-pub mod relay_ws;

tcp_relay_server/src/main.rs

@@ -1,74 +0,0 @@
-use std::sync::Arc;
-
-use actix_web::{App, HttpRequest, HttpResponse, HttpServer, middleware, Responder, web};
-use actix_web::web::Data;
-use clap::Parser;
-
-use base::RelayedPort;
-use tcp_relay_server::args::Args;
-use tcp_relay_server::relay_ws::relay_ws;
-
-pub async fn hello_route() -> &'static str {
-    "Hello world!"
-}
-
-pub async fn config_route(req: HttpRequest, data: Data<Arc<Args>>) -> impl Responder {
-    let token = req.headers().get("Authorization")
-        .map(|t| t.to_str().unwrap_or_default())
-        .unwrap_or_default()
-        .strip_prefix("Bearer ")
-        .unwrap_or_default();
-
-    if !data.tokens.iter().any(|t| t.eq(token)) {
-        return HttpResponse::Unauthorized().json("Missing / invalid token");
-    }
-
-    HttpResponse::Ok().json(
-        data.ports.iter()
-            .enumerate()
-            .map(|(id, port)| RelayedPort { id, port: port + data.increment_ports })
-            .collect::<Vec<_>>()
-    )
-}
-
-#[actix_web::main]
-async fn main() -> std::io::Result<()> {
-    env_logger::init_from_env(env_logger::Env::new().default_filter_or("info"));
-
-    let mut args: Args = Args::parse();
-
-    if args.ports.is_empty() {
-        log::error!("No port to forward!");
-        std::process::exit(2);
-    }
-
-    // Read tokens from file, if any
-    if let Some(file) = &args.tokens_file {
-        std::fs::read_to_string(file)
-            .expect("Failed to read tokens file!")
-            .split('\n')
-            .filter(|l| !l.is_empty())
-            .for_each(|t| args.tokens.push(t.to_string()));
-    }
-
-    if args.tokens.is_empty() {
-        log::error!("No tokens specified!");
-        std::process::exit(3);
-    }
-
-    log::info!("Starting relay on http://{}", args.listen_address);
-
-    let args = Arc::new(args);
-    let args_clone = args.clone();
-    HttpServer::new(move || {
-        App::new()
-            .wrap(middleware::Logger::default())
-            .app_data(Data::new(args_clone.clone()))
-            .route("/", web::get().to(hello_route))
-            .route("/config", web::get().to(config_route))
-            .route("/ws", web::get().to(relay_ws))
-    })
-        .bind(&args.listen_address)?
-        .run()
-        .await
-}