switch-lan-play

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Enjoy games with your friends as if you were on a LAN.

                     Internet
                        |
                  [SOCKS5 Proxy] (optional)
                        |
        ARP,IPv4        |          LAN Packets
Switch <-------->  PC(lan-play)  <-------------> Server
                                       UDP

Usage

To play with your friends, both you and your friends need to run the lan-play client connecting to the same Server on your PCs, and set static IP on your Switch.

Your PC and Switch must be connected to the same router.

Visit https://www.lan-play.com/ for instructions on how to set this up. See below for build instructions.

SOCKS5 Proxy

lan-play --socks5-server-addr example.com:1080

Data sent to the relay server does not pass through the proxy.

Build

Debug or Release

cmake -DCMAKE_BUILD_TYPE=Debug .. cmake -DCMAKE_BUILD_TYPE=Release ..

Ubuntu / Debian

This project depends on libpcap, you can install libpcap0.8-dev on Ubuntu or Debian:

sudo apt install libpcap0.8-dev git gcc g++ cmake

Prepare cmake and gcc, then run the following:

mkdir build
cd build
cmake ..
make

Windows

Use MSYS2 to compile.

pacman -Sy
pacman -S make \
    mingw-w64-x86_64-cmake \
    mingw-w64-x86_64-gcc

To compile a 32-bit program:

pacman -S mingw-w64-i686-cmake \
    mingw-w64-i686-gcc

Open MSYS2 MinGW 64-bit or MSYS2 MinGW 32-bit.

mkdir build
cd build
cmake -G "MSYS Makefiles" ..
make

Mac OS

brew install cmake

mkdir build
cd build
cmake ..
make

Server

Docker

docker run -d -p 11451:11451/udp -p 11451:11451/tcp spacemeowx2/switch-lan-play

Node

git clone https://github.com/spacemeowx2/switch-lan-play
cd switch-lan-play/server
npm install
npm run build # build ts to js. run it again when code changes.
npm start

Use --port to pass the port parameter, or it will use 11451/udp as the default.

Use --simpleAuth to pass authentication via username and password, or there will be no authentication.

Use --httpAuth to pass authentication via HTTP URL, or there will be no authentication.

Use --jsonAuth to pass authentication via JSON file, or there will be no authentication.

Example:

npm run build
npm start -- --port 10086 --simpleAuth username:password

Meanwhile, the monitor service will start on port 11451/tcp by default. You can get the online client count via an HTTP request:

Request: GET http://{YOUR_SERVER_IP}:11451/info

Response: { "online": 42 }

Protocol

The protocol is quite simple at the moment, but additional fields may be added to calculate network quality (packet loss, ping), such as timestamp, seq_id, etc.

struct packet {
    uint8_t type;
    uint8_t payload[packet_len - 1];
};

enum type {
    KEEPALIVE = 0,
    IPV4 = 1,
    PING = 2,
    IPV4_FRAG = 3
};

The server can read IP addresses from the payload and save the source IP -> LAN IP to a cache table. If the target IP address shown in the payload doesn't match the cache, the packet is broadcast to the entire room.