Add new test for client configuration

src/base/err_utils.rs

@@ -2,8 +2,8 @@ use std::fmt::Display;
 use std::io::ErrorKind;
 
 /// Encapsulate errors in [`std::io::Error`] with a message
-pub fn encpasulate_error<E: Display>(e: E, msg: &str) -> std::io::Error {
-    std::io::Error::new(ErrorKind::Other, format!("{}: {}", msg, e))
+pub fn encpasulate_error<E: Display, F: ToString>(e: E, msg: F) -> std::io::Error {
+    std::io::Error::new(ErrorKind::Other, format!("{}: {}", msg.to_string(), e))
 }
 
 /// Create a new [`std::io::Error`]

src/tcp_relay_client/client_config.rs

@@ -1,3 +1,4 @@
+use crate::base::err_utils::encpasulate_error;
 use bytes::BufMut;
 use clap::Parser;
 
@@ -45,21 +46,13 @@ pub struct KeysCache {
 
 impl ClientConfig {
     /// Load certificates and put them in cache
-    pub fn load_certificates(&mut self) {
+    pub fn load_certificates(&mut self) -> std::io::Result<()> {
         self._keys_cache = KeysCache {
-            _root_certificate_cache: self
-                .root_certificate
-                .as_ref()
-                .map(|c| std::fs::read(c).expect("Failed to read root certificate!")),
-            _tls_cert_cache: self
-                .tls_cert
-                .as_ref()
-                .map(|c| std::fs::read(c).expect("Failed to read client certificate!")),
-            _tls_key_cache: self
-                .tls_key
-                .as_ref()
-                .map(|c| std::fs::read(c).expect("Failed to read client key!")),
+            _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_cert, "client key")?,
         };
+        Ok(())
     }
 
     /// Get client token, returning a dummy token if none was specified
@@ -95,6 +88,16 @@ impl ClientConfig {
     }
 }
 
+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;

src/tcp_relay_client/mod.rs

@@ -7,6 +7,7 @@ use std::sync::Arc;
 use futures::future::join_all;
 use reqwest::{Certificate, Identity};
 
+use crate::base::err_utils::new_err;
 use crate::base::RemoteConfig;
 use crate::tcp_relay_client::client_config::ClientConfig;
 use crate::tcp_relay_client::relay_client::relay_client;
@@ -54,15 +55,14 @@ async fn get_server_config(conf: &ClientConfig) -> Result<RemoteConfig, Box<dyn
 
 /// Core logic of the application
 pub async fn run_app(mut args: ClientConfig) -> std::io::Result<()> {
-    args.load_certificates();
+    args.load_certificates()?;
     let args = Arc::new(args);
 
     // Check arguments coherence
     if args.tls_cert.is_some() != args.tls_key.is_some() {
-        log::error!(
-            "If you specify one of TLS certificate / key, you must then specify the other!"
-        );
-        panic!();
+        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() {

src/test/client_invalid_tls_root_certificate_file.rs

@@ -0,0 +1,41 @@
+use crate::tcp_relay_client::client_config::ClientConfig;
+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::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/file".to_string()),
+        ..Default::default()
+    })
+    .await
+    .unwrap_err();
+}

src/test/mod.rs

@@ -24,13 +24,14 @@ mod dummy_tcp_sockets;
 mod pki;
 mod test_files_utils;
 
+mod client_invalid_tls_root_certificate_file;
 mod client_try_tls_while_there_is_no_tls;
-mod invalid_token_file;
 mod invalid_with_token_auth;
 mod server_invalid_tls_config_invalid_cert;
 mod server_invalid_tls_config_invalid_key;
 mod server_invalid_tls_config_invalid_paths;
 mod server_invalid_tls_config_missing_key;
+mod server_invalid_token_file;
 mod valid_token_with_custom_increment;
 mod valid_with_multiple_token_auth;
 mod valid_with_token_auth;