feat: bind torrent client to a network adapter

python_rpc/main.py

@@ -86,6 +86,7 @@
 # This can be streamed down from Node
 downloading_game_id = -1
 current_download_limit = None
+current_network_interface = None
 
 torrent_session = lt.session(
     {"listen_interfaces": "0.0.0.0:{port}".format(port=torrent_port)}
@@ -247,6 +248,39 @@
     if callable(set_download_limit):
         set_download_limit(current_download_limit)
 
+
+def normalize_network_interface(value):
+    if not isinstance(value, str):
+        return None
+
+    trimmed = value.strip()
+    return trimmed or None
+
+
+def apply_network_interface(interface):
+    if interface:
+        listen_interfaces = "{iface}:{port}".format(
+            iface=interface, port=torrent_port
+        )
+        outgoing_interfaces = interface
+    else:
+        listen_interfaces = "0.0.0.0:{port}".format(port=torrent_port)
+        outgoing_interfaces = ""
+
+    try:
+        torrent_session.apply_settings(
+            {
+                "listen_interfaces": listen_interfaces,
+                "outgoing_interfaces": outgoing_interfaces,
+            }
+        )
+        logger.info(
+            "Bound torrent client to network interface: %s",
+            interface or "default (all adapters)",
+        )
+    except Exception as error:
+        logger.error("Failed to bind torrent client to interface: %s", error)
+
 def validate_rpc_password_value(password: Optional[str]):
     if rpc_password == "":
         return True
@@ -429,6 +463,7 @@
 def action(data: Optional[dict] = None):
     global downloading_game_id
     global current_download_limit
+    global current_network_interface
 
     data = data or {}
     action_name = data.get("action")
@@ -511,6 +546,11 @@
 
             for downloader in active_downloaders:
                 apply_download_limit(downloader)
+        elif action_name == "set_network_interface":
+            current_network_interface = normalize_network_interface(
+                data.get("interface")
+            )
+            apply_network_interface(current_network_interface)
         else:
             raise RpcError("invalid_action")
     except RpcError:

src/locales/en/translation.json

@@ -769,6 +769,10 @@
     "app_basics": "App basics",
     "startup_behavior": "Startup behavior",
     "download_behavior": "Download behavior",
+    "network_interface": "Network adapter for torrents",
+    "network_interface_default": "Default (all adapters)",
+    "network_interface_hint": "Bind the torrent client to a specific adapter, such as a VPN. While bound, torrents only connect through that adapter, and downloads stop if it goes down (no traffic leaks through your regular connection).",
+    "network_interface_unavailable": "unavailable",
     "library_notifications": "Library notifications",
     "achievement_notifications": "Achievement notifications",
     "content_gameplay": "Content & gameplay",

src/locales/es/translation.json

@@ -731,6 +731,10 @@
     "app_basics": "Básicos de la aplicación",
     "startup_behavior": "Comportamiento al iniciar",
     "download_behavior": "Comportamiento de descarga",
+    "network_interface": "Adaptador de red para torrents",
+    "network_interface_default": "Predeterminado (todos los adaptadores)",
+    "network_interface_hint": "Vincula el cliente de torrents a un adaptador específico, como una VPN. Mientras está vinculado, los torrents solo se conectan a través de ese adaptador y las descargas se detienen si deja de funcionar (sin fugas de tráfico por tu conexión habitual).",
+    "network_interface_unavailable": "no disponible",
     "library_notifications": "Notificaciones de la librería",
     "achievement_notifications": "Notificaciones de logros",
     "content_preferences": "Preferencias de contenido",

src/locales/pt-BR/translation.json

@@ -679,6 +679,10 @@
     "app_basics": "Noções básicas do aplicativo",
     "startup_behavior": "Comportamento na inicialização",
     "download_behavior": "Comportamento de download",
+    "network_interface": "Adaptador de rede para torrents",
+    "network_interface_default": "Padrão (todos os adaptadores)",
+    "network_interface_hint": "Vincula o cliente de torrent a um adaptador específico, como uma VPN. Enquanto vinculado, os torrents só se conectam por esse adaptador e os downloads param se ele cair (sem vazamento de tráfego pela sua conexão normal).",
+    "network_interface_unavailable": "indisponível",
     "library_notifications": "Notificações da biblioteca",
     "achievement_notifications": "Notificações de conquistas",
     "content_preferences": "Preferências de conteúdo",

src/locales/pt-PT/translation.json

@@ -626,6 +626,10 @@
     "app_basics": "Noções básicas da aplicação",
     "startup_behavior": "Comportamento no arranque",
     "download_behavior": "Comportamento de transferência",
+    "network_interface": "Adaptador de rede para torrents",
+    "network_interface_default": "Predefinido (todos os adaptadores)",
+    "network_interface_hint": "Vincula o cliente de torrent a um adaptador específico, como uma VPN. Enquanto vinculado, os torrents só se ligam através desse adaptador e as transferências param se ele ficar indisponível (sem fugas de tráfego pela sua ligação normal).",
+    "network_interface_unavailable": "indisponível",
     "library_notifications": "Notificações da biblioteca",
     "achievement_notifications": "Notificações de conquistas",
     "content_preferences": "Preferências de conteúdo",

src/locales/ru/translation.json

@@ -770,6 +770,10 @@
     "app_basics": "Основные настройки приложения",
     "startup_behavior": "Поведение при запуске",
     "download_behavior": "Поведение загрузок",
+    "network_interface": "Сетевой адаптер для торрентов",
+    "network_interface_default": "По умолчанию (все адаптеры)",
+    "network_interface_hint": "Привязывает торрент-клиент к выбранному адаптеру, например к VPN. Пока привязка активна, торренты подключаются только через этот адаптер, а загрузки останавливаются, если он отключится (без утечки трафика через обычное соединение).",
+    "network_interface_unavailable": "недоступен",
     "library_notifications": "Уведомления библиотеки",
     "achievement_notifications": "Уведомления о достижениях",
     "content_gameplay": "Контент и игровой процесс",

src/main/events/hardware/get-network-interfaces.ts

@@ -0,0 +1,33 @@
+import os from "node:os";
+
+import type { NetworkInterface } from "@types";
+import { registerEvent } from "../register-event";
+
+const getNetworkInterfaces = async (): Promise<NetworkInterface[]> => {
+  const interfaces = os.networkInterfaces();
+
+  return Object.entries(interfaces).reduce<NetworkInterface[]>(
+    (acc, [name, addresses]) => {
+      const external = (addresses ?? []).filter((address) => !address.internal);
+
+      if (external.length === 0) {
+        return acc;
+      }
+
+      const sorted = external.sort((a, b) => {
+        if (a.family === b.family) return 0;
+        return a.family === "IPv4" ? -1 : 1;
+      });
+
+      acc.push({
+        name,
+        addresses: sorted.map((address) => address.address),
+      });
+
+      return acc;
+    },
+    []
+  );
+};
+
+registerEvent("getNetworkInterfaces", getNetworkInterfaces);

src/main/events/hardware/index.ts

@@ -1,2 +1,3 @@
 import "./check-folder-write-permission";
 import "./get-disk-free-space";
+import "./get-network-interfaces";

src/main/events/user-preferences/update-user-preferences.ts

@@ -94,6 +94,12 @@ const updateUserPreferences = async (
       preferences.maxDownloadSpeedBytesPerSecond ?? null
     );
   }
+
+  if (Object.hasOwn(preferences, "torrentNetworkInterface")) {
+    await DownloadManager.applyNetworkInterface(
+      preferences.torrentNetworkInterface ?? null
+    );
+  }
 };
 
 registerEvent("updateUserPreferences", updateUserPreferences);

src/main/services/download/download-manager.ts

@@ -266,12 +266,42 @@
       });
   }
 
+  private static async getPersistedNetworkInterface() {
+    const userPreferences = await db.get<string, UserPreferences | null>(
+      levelKeys.userPreferences,
+      { valueEncoding: "json" }
+    );
+
+    return userPreferences?.torrentNetworkInterface ?? null;
+  }
+
+  public static async applyNetworkInterface(
+    value?: string | null
+  ): Promise<void> {
+    const networkInterface =
+      value === undefined ? await this.getPersistedNetworkInterface() : value;
+
+    await PythonRPC.rpc
+      .call("action", {
+        action: "set_network_interface",
+        interface: networkInterface ?? "",
+      })
+      .catch((error) => {
+        logger.error(
+          "[DownloadManager] Failed to update RPC network interface:",
+          error
+        );
+      });
+  }
+
   public static async startRPC(
     download?: Download,
     downloadsToSeed?: Download[]
   ) {
     await PythonRPC.spawn();
 
+    await this.applyNetworkInterface();
+
     if (downloadsToSeed?.length) {
       for (const seedDownload of downloadsToSeed) {
         await this.resumeSeeding(seedDownload).catch((error) => {

src/preload/index.ts

@@ -778,6 +778,7 @@ contextBridge.exposeInMainWorld("electron", {
     ipcRenderer.invoke("getDiskFreeSpace", path),
   checkFolderWritePermission: (path: string) =>
     ipcRenderer.invoke("checkFolderWritePermission", path),
+  getNetworkInterfaces: () => ipcRenderer.invoke("getNetworkInterfaces"),
 
   /* Cloud save */
   uploadSaveGame: (

src/renderer/src/declaration.d.ts

@@ -37,6 +37,7 @@ import type {
   AchievementNotificationInfo,
   Game,
   DiskUsage,
+  NetworkInterface,
   DownloadSource,
   LocalNotification,
   ProtonVersion,
@@ -605,6 +606,7 @@ declare global {
     /* Hardware */
     getDiskFreeSpace: (path: string) => Promise<DiskUsage>;
     checkFolderWritePermission: (path: string) => Promise<boolean>;
+    getNetworkInterfaces: () => Promise<NetworkInterface[]>;
 
     /* Cloud save */
     uploadSaveGame: (

src/renderer/src/pages/settings/settings-context-downloads.tsx

@@ -1,9 +1,10 @@
-import { useContext, useEffect, useState } from "react";
+import { useContext, useEffect, useMemo, useState } from "react";
 import { useTranslation } from "react-i18next";
 
-import { CheckboxField, TextField } from "@renderer/components";
+import { CheckboxField, SelectField, TextField } from "@renderer/components";
 import { settingsContext } from "@renderer/context";
 import { useAppSelector } from "@renderer/hooks";
+import type { NetworkInterface } from "@types";
 import { SettingsDownloadSources } from "./settings-download-sources";
 
 import "./settings-general.scss";
@@ -50,8 +51,20 @@
     createStartMenuShortcut: true,
     maxDownloadSpeedMegabytes: "",
     deleteArchiveFilesAfterExtractionByDefault: false,
+    torrentNetworkInterface: "",
   });
 
+  const [networkInterfaces, setNetworkInterfaces] = useState<
+    NetworkInterface[]
+  >([]);
+
+  useEffect(() => {
+    window.electron
+      .getNetworkInterfaces()
+      .then(setNetworkInterfaces)
+      .catch(() => setNetworkInterfaces([]));
+  }, []);
+
   useEffect(() => {
     if (!userPreferences) return;
 
@@ -72,9 +85,40 @@
           : "",
       deleteArchiveFilesAfterExtractionByDefault:
         userPreferences.deleteArchiveFilesAfterExtractionByDefault ?? false,
+      torrentNetworkInterface: userPreferences.torrentNetworkInterface ?? "",
     });
   }, [userPreferences]);
 
+  const networkInterfaceOptions = useMemo(() => {
+    const options = [
+      { key: "default", value: "", label: t("network_interface_default") },
+      ...networkInterfaces.map((networkInterface) => {
+        const ipv4 = networkInterface.addresses.find(
+          (address) => !address.includes(":")
+        );
+
+        return {
+          key: networkInterface.name,
+          value: networkInterface.name,
+          label: ipv4
+            ? `${networkInterface.name} (${ipv4})`
+            : networkInterface.name,
+        };
+      }),
+    ];
+
+    const selected = form.torrentNetworkInterface;
+    if (selected && !options.some((option) => option.value === selected)) {
+      options.push({
+        key: selected,
+        value: selected,
+        label: `${selected} (${t("network_interface_unavailable")})`,
+      });
+    }
+
+    return options;
+  }, [networkInterfaces, form.torrentNetworkInterface, t]);
+
   const handleChange = (values: Partial<typeof form>) => {
     setForm((prev) => ({ ...prev, ...values }));
     updateUserPreferences(values);
@@ -159,6 +203,20 @@
           placeholder={t("max_download_speed_unlimited")}
         />
 
+        <div className="settings-general__network-interface">
+          <SelectField
+            label={t("network_interface")}
+            value={form.torrentNetworkInterface}
+            onChange={(event) =>
+              handleChange({ torrentNetworkInterface: event.target.value })
+            }
+            options={networkInterfaceOptions}
+          />
+          <small className="settings-general__network-interface-hint">
+            {t("network_interface_hint")}
+          </small>
+        </div>
+
         <CheckboxField
           label={t("seed_after_download_complete")}
           checked={form.seedAfterDownloadComplete}

src/renderer/src/pages/settings/settings-general.scss

@@ -25,6 +25,17 @@
     font-style: italic;
   }
 
+  &__network-interface {
+    display: flex;
+    flex-direction: column;
+    gap: globals.$spacing-unit;
+  }
+
+  &__network-interface-hint {
+    font-size: 13px;
+    color: globals.$muted-color;
+  }
+
   &__volume-control {
     display: flex;
     flex-direction: column;

src/types/level.types.ts

@@ -182,13 +182,19 @@ export interface UserPreferences {
   bigPictureDiagnosticsEnabled?: boolean;
   bigPictureDiagnosticsPosition?: BigPictureDiagnosticsPosition;
   maxDownloadSpeedBytesPerSecond?: number | null;
+  torrentNetworkInterface?: string | null;
   defaultProtonPath?: string | null;
   autoRunMangohud?: boolean;
   autoRunGamemode?: boolean;
   hideClassicsBookmark?: boolean;
   classicsUseHeroLayout?: boolean;
 }
 
+export interface NetworkInterface {
+  name: string;
+  addresses: string[];
+}
+
 export interface ScreenState {
   x?: number;
   y?: number;