LANxfer2.0

The Problem

Transferring files across devices on the same local network is surprisingly broken. Cloud services like Google Drive compress files, limit sizes, and completely fail without internet. Browser-based P2P tools (WebRTC) fail silently behind corporate NAT/firewalls. Apple's AirDrop is incredible but platform-locked. Solutions like USB drives are cumbersome.

There is no open-source, cross-platform, offline-native tool with a premium, seamless desktop UX... until LANxfer 2.0.

Key Features

LANxfer 2.0 brings enterprise-grade security and robust networking into a breathtaking "Tech-Noir" interface.

Enterprise-Grade Security & P2P

• Zero Configuration Discovery: Peers appear automatically via mDNS/Zeroconf. No manual IP entry required. Ever.

• Per-Session ECDH Key Exchange: Generates a fresh session key per transfer using Elliptic Curve Diffie-Hellman (SECP256R1). Zero static secrets.

• Military-Grade Encryption: AES-256-GCM authenticated encryption ensures integrity and confidentiality per chunk.

• Device Fingerprinting: SHA-256 trust-on-first-use model (~/.lanxfer/trusted_devices.json).

• Zero Internet Required: Works flawlessly over LAN, Wi-Fi Direct, Mobile Hotspot, or Tethering.

Next-Gen Transfer Engine

• Delta Sync (librsync): If you re-send a modified file, LANxfer 2.0 calculates the binary diff and only transmits changed byte ranges. Achieves up to 100x bandwidth savings!

• Resumable Chunking: Files are sent in SHA-256 verified 4MB chunks. If disconnected, it auto-resumes from the exact skipped offset upon reconnection.

• Real-Time Visualizations: Live transfer speed, delta savings charts (Chart.js), and exact chunk progression mapping.

Premium "Tech-Noir" UX

• Glassmorphism UI: Stunning grid-based dashboard, sleek dark mode, and dynamic micro-animations.

• Command Palette: Press Ctrl+K globally to open a spotlight-style command search. Trigger uploads, refresh peers, or search transfer history instantly.

• Clipboard Sharing: Send copied text/URLs peer-to-peer and receive it as an OS notification toast with a 1-click apply.

• Mobile-Ready via QR: Scan a QR code on desktop; your mobile device joins the secure swarm via a browser peer—no app installation required on the phone.

Architecture & How It Works

LANxfer 2.0 uses a hybrid architecture. The robust transfer engine, encryption, and mDNS discovery run as a Python background service (Flask + SocketIO), while the frontend is a native Electron wrapper running a stunning Vanilla JS/CSS web app.

Delta Sync Flow

Instead of resending a 1GB file when you fix a typo:

1. Sender asks: "Do you have video.mp4 with hash XYZ?"

2. Server matches hash and returns storage flag.

3. Server computes rolling checksums (librsync) and generates a diff signature.

4. Only the new encoded delta changes are transmitted.

5. Server reconstructs the exact file locally.

Tech Stack

LayerTechnologies UsedDesktop ShellElectron 33, electron-builderTransfer EnginePython 3.9+, Flask, Flask-SocketIO, EventletFrontend UIVanilla JS, HTML5, CSS3, Chart.js (Glassmorphic Tech-Noir UI)Peer Discoverypython-zeroconf (mDNS / Bonjour)Cryptographycryptography (AES-256-GCM + SECP256R1 ECDH), pycryptodomeDelta Synclibrsync (delta.py implementation)DatabaseSQLite3 (Persistent Audit Log & Transfer State)

Installation & Running

⚡ Option 1: Standalone Installer (Recommended)

Requires Python 3.9+ installed on your machine. During install, check "Add Python to PATH".

You just require Python to use LANxfer. The entire Python backend, virtual environment, and UI are fully bundled into a single standalone .exe!

1. Go to the GitHub Releases tab.

2. Download the latest LANxfer-Setup-2.0.0.exe.

3. Run the installer and you're good to go!

🛠️ Option 2: Build From Source

Prerequisites

• Python 3.9+

• Node.js 18+ and npm 9+

1. Clone the repository

git clone https://github.com/Atharvasawant09/Lanxfer2.0.git
cd Lanxfer2.0

2. Setup Python Environment

python -m venv .venv

# Windows
.venv\Scripts\activate

# macOS / Linux
source .venv/bin/activate

pip install -r requirements.txt

3. Setup Desktop Environment

npm install

4. SSL Certificates (Required for HTTPS & Mobile)

Generate a self-signed cert in the root directory:

openssl req -x509 -newkey rsa:4096 -keyout key.pem -out cert.pem -days 365 -nodes -subj "/CN=localhost"

5. Start Development Server

npm run dev

6. Build the Executable

Package the entire Electron app and Python backend into a highly optimized installer:

npm run build:win

The .exe will be generated inside the dist/ folder.

Usage

1. Launch: Run the app. It will start a local server and seamlessly wrap it in the Electron UI.

2. Discover: Any other LANxfer instance on your network will instantly pop up under "Active Peers".

3. Transfer: Drag & Drop a file onto the UI, select your peer. Watch the real-time chunk visualizer.

4. Command Palette: Test Ctrl+K to search files or actions.

5. Mobile Connect: Press "Show QR Code" (Ctrl+K -> QR) and scan it with your phone. Accept the SSL warning, and your phone can now securely interact with your desktop file swarm!