From f6d412edb08f9fdca34f761a1b29cada83bb9250 Mon Sep 17 00:00:00 2001
From: DarkOtter <>
Date: Sat, 11 Apr 2026 11:47:18 +0100
Subject: [PATCH] Add a config to specify which host to bind to

This should allow running listening only on localhost for better security when bitburner and the sync are both run on the same host, which I imagine is common.

Ran tests for commit:
npm run format
npm run lint
npm run test

(all tests passed)

Ran the program with unchanged config (no host specified), observed still listening on [::], observed able to connect and sync from bitburner on another host.

Added the host option set to localhost, ran again and observed I was unable to connect from the other host.
---
 src/config.ts               | 7 +++++++
 src/index.ts                | 3 ++-
 src/networking/webSocket.ts | 3 ++-
 3 files changed, 11 insertions(+), 2 deletions(-)

diff --git a/src/config.ts b/src/config.ts
index 396f8a3..ae8e9b5 100644
--- a/src/config.ts
+++ b/src/config.ts
@@ -14,6 +14,13 @@ export const config = convict({
     default: false,
     arg: "allowDeletingFiles",
   },
+  host: {
+    doc: "The host to bind to.",
+    format: "String",
+    nullable: true,
+    default: null,
+    arg: "host",
+  },
   port: {
     doc: "The port to bind to.",
     format: "Number",
diff --git a/src/index.ts b/src/index.ts
index 196b988..f2a1063 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -56,7 +56,8 @@ export async function start() {
       signal.emit(EventType.MessageSend, fileRemovalEventToMsg(fileEvent)),
     );
 
-  console.log(`Server is ready, running on ${config.get("port")}!`);
+  const configHost = config.get("host");
+  console.log(`Server is ready, running on ${configHost != null ? configHost + ":" : ""}${config.get("port")}!`);
 
   process.on("SIGINT", function () {
     console.log("Shutting down!");
diff --git a/src/networking/webSocket.ts b/src/networking/webSocket.ts
index 78faca7..ab78273 100644
--- a/src/networking/webSocket.ts
+++ b/src/networking/webSocket.ts
@@ -6,7 +6,8 @@ import { Message } from "../interfaces.js";
 import { messageTracker } from "./messageTracker.js";
 
 export function setupSocket(signaller: Signal) {
-  const wss = new WebSocketServer({ port: config.get("port") });
+  const configHost: string | null = config.get("host");
+  const wss = new WebSocketServer({ port: config.get("port"), host: configHost ?? undefined });
 
   wss.on("connection", function connection(ws) {
     function sendMessage(msg: Message) {