WireGuard TCP tunneling

About

This project is a simple UDP-over-TCP tunneling. The main purpose of it is to allow WireGuard to work over TCP.

flowchart RL
  subgraph "Peer B (client)"
    A[WireGuard] <--UDP--> B[TCP2UDP]
  end
  B --TCP--> C
  subgraph "Peer A (server)"
    C[UDP2TCP] <--UDP--> D[WireGuard]
  end

Installation

Dependencies

This project is based on Boost.Asio, so in order to build it you need to have Boost installed. Also, you need to have CMake and a C++ compiler that supports C++17.

On Debian-based systems all dependencies can be installed by running:

sudo apt install \
  libboost-dev libboost-log-dev libboost-program-options-dev libssl-dev \
  cmake g++

On Termux, one can get all dependencies by running:

pkg install \
  boost boost-headers openssl \
  cmake clang

Building

cmake -S . -B build \
  -DCMAKE_BUILD_TYPE=Release \
  -DENABLE_SYSTEMD=ON \
  -DENABLE_WEBSOCKET=ON \
  -DENABLE_NGROK=ON
cmake --build build
sudo cmake --install build

Usage

Server Side

On the server side (the side that has a public IP address) you can run the wg-tcp-tunnel as follows:

wg-tcp-tunnel --src-tcp=0.0.0.0:51820 --dst-udp=127.0.0.1:51820

This will tell the wg-tcp-tunnel to listen on all interfaces on port 51820 for TCP connections and forward them to the local WireGuard instance. This repository contains a systemd service file that can be used to run the wg-tcp-tunnel as a service. By default, that service will do exactly the same as the command above.

Client Side

On the client side one can run the wg-tcp-tunnel as follows:

wg-tcp-tunnel --src-udp=127.0.0.1:51822 --dst-tcp=<SERVER-IP>:51820

This will tell the wg-tcp-tunnel to listen on the loopback interface on port 51822 for UDP connections and forward them to the server's public IP address over TCP. Then in the WireGuard configuration file one needs to specify the peer's endpoint address as Endpoint = 127.0.0.1:51822. Simple as that.

When configured with -DENABLE_NGROK=ON, the wg-tcp-tunnel also provides support for getting NGROK endpoint and using it as a destination address. In order to use this feature, one needs to specify the --ngrok-api-key=KEY and --ngrok-dst-tcp-endpoint=ENDPOINT options. For more information about these options, please refer to the --help output.

License

This project is licensed under the MIT license. See the LICENSE file for details.