Add native remote port forwarding

tests/integration_smoke.rs

@@ -33,6 +33,17 @@ fn write_server_config(dir: &tempfile::TempDir, port: u16) -> std::path::PathBuf
     write_server_config_with_timeout(dir, port, 30)
 }
 
+fn write_server_config_with_remote_forwarding(
+    dir: &tempfile::TempDir,
+    port: u16,
+) -> std::path::PathBuf {
+    let config = write_server_config(dir, port);
+    let mut raw = fs::read_to_string(&config).unwrap();
+    raw.push_str("allow_remote_forwarding = true\n");
+    fs::write(&config, raw).unwrap();
+    config
+}
+
 fn write_server_config_with_timeout(
     dir: &tempfile::TempDir,
     port: u16,
@@ -596,6 +607,58 @@ fn native_local_forward_echo_smoke() {
     );
 }
 
+#[test]
+fn native_remote_forward_echo_smoke() {
+    let dir = tempfile::tempdir().unwrap();
+    let port = free_udp_port();
+    let config = write_server_config_with_remote_forwarding(&dir, port);
+    write_native_client_auth(&dir, &config);
+    let echo_port = start_echo_server();
+    let remote_port = free_tcp_port();
+    let mut server = start_server(&dir, &config);
+    let client_bin = env!("CARGO_BIN_EXE_dosh-client");
+    let mut client = Command::new(client_bin)
+        .arg("--auth")
+        .arg("native")
+        .arg("--no-cache")
+        .arg("-N")
+        .arg("-R")
+        .arg(format!("{remote_port}:127.0.0.1:{echo_port}"))
+        .arg("--session")
+        .arg("default")
+        .arg("--dosh-host")
+        .arg("127.0.0.1")
+        .arg("--dosh-port")
+        .arg(port.to_string())
+        .arg("local")
+        .env("HOME", dir.path())
+        .stdin(Stdio::null())
+        .stdout(Stdio::null())
+        .stderr(Stdio::piped())
+        .spawn()
+        .unwrap();
+
+    let mut stream = connect_with_retry(remote_port, Duration::from_secs(5), &mut client);
+    stream
+        .set_read_timeout(Some(Duration::from_secs(3)))
+        .unwrap();
+    stream.write_all(b"dosh-remote-forward-ping").unwrap();
+    let mut buf = [0u8; 64];
+    let n = stream.read(&mut buf).unwrap();
+
+    let _ = client.kill();
+    let client_output = client.wait_with_output().unwrap();
+    let _ = server.kill();
+    let _ = server.wait();
+
+    assert_eq!(&buf[..n], b"dosh-remote-forward-ping");
+    assert!(
+        client_output.status.success() || client_output.status.code().is_none(),
+        "stderr={}",
+        String::from_utf8_lossy(&client_output.stderr)
+    );
+}
+
 #[test]
 fn ticket_attach_after_server_restart_smoke() {
     let dir = tempfile::tempdir().unwrap();