BadVPN is an open-source collection of network utilities primarily known for its peer-to-peer (P2P) VPN system and its highly popular tun2socks tool, both designed by developer Ambrož Bizjak. Written entirely in the C programming language, the project offers lightweight, event-driven solutions for complex routing, network isolation, and proxying tasks.
Despite its name containing the word “Bad,” it is not malware or a poorly designed protocol; rather, it is a highly reliable suite of tools frequently utilized in custom networking setups, privacy routing (like Tor or Shadowsocks), and Android VPN apps. Core Components of BadVPN
The project is packaged together due to heavy code-sharing, but it serves three distinct functions: 1. badvpn-tun2socks (The Most Popular Tool)
This utility “socksifies” entire network connections at the network layer.
How it works: It creates a virtual TUN (network tunnel) device on your operating system. It intercepts all incoming TCP and UDP traffic—regardless of the application’s native proxy support—and forces it through a specified SOCKS proxy or SSH tunnel.
Use case: If you have an app that doesn’t allow you to configure a proxy in its settings, tun2socks transparently forces that app’s traffic through your proxy at the system level. 2. The Peer-to-Peer VPN System
Unlike traditional VPNs that route all traffic through one massive, central server, BadVPN establishes a decentralized Layer 2 (Ethernet) P2P network between nodes. badvpn.wiki – Google Code
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