Mirror/README.md

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**Stop worrying about networking. Because we do.**

## Mirror
Mirror is a **high level** Networking library for Unity, compatible with different **low level** [Transports](https://github.com/vis2k/Mirror#low-level-transports).

Mirror is for small indie games & large scale [MMOs](https://www.youtube.com/watch?v=mDCNff1S9ZU), made by the developers of [uMMORPG](https://assetstore.unity.com/packages/templates/systems/ummorpg-components-edition-159401) and [Cubica](https://www.youtube.com/watch?v=D_f_MntrLVE).

Mirror is optimized for **ease of use** & **probability of success**.

We needed a networking library that allows us to **[launch our games](https://mirror-networking.com/showcase/)** and **survive the next decade**.

## Architecture
The **Server & Client** are **ONE project** in order to achieve an order of magnitude gain in productivity.

Making multiplayer games this way is fun & easy. Instead of MonoBehaviour, Mirror provides **NetworkBehaviour** components with:
* **[Server]** / **[Client]** tags for server-only / client-only code
* **[Command]** for Client->Server function calls (e.g. UseItem)
* **[ClientRpc]** / **[TargetRpc]** for Server->Client function calls (e.g. AddChatMessage)
* **[SyncVar]** / SyncList to automatically synchronize variables from Server->Client

_Note: Mirror is based on Unity's abandoned UNET Networking system. We fixed it up and pushed it to MMO Scale._

## Low Level Transports
* (built in) [KCP](https://github.com/skywind3000/kcp): reliable UDP
* (built in) [Telepathy](https://github.com/vis2k/Telepathy): TCP
* (built in) [Ninja.Websockets](https://github.com/ninjasource/Ninja.WebSockets): Websockets
* Libuv: TCP powered by Node.js' native C networking
* [LiteNetLib](https://github.com/MirrorNetworking/LiteNetLibTransport/) UDP
* [Ignorance](https://github.com/SoftwareGuy/Ignorance/): ENET UDP
* [UNET LLAPI](https://github.com/SoftwareGuy/Mirror-UnityLLAPI): UDP
* [FizzySteam](https://github.com/Raystorms/FizzySteamyMirror/): SteamNetwork
* [Epic](https://github.com/FakeByte/EpicOnlineTransport): Epic Online Services

## Getting Started
Get **Unity 2018/2019 LTS**, download [Mirror on the Asset Store](https://assetstore.unity.com/packages/tools/network/mirror-129321), open one of the examples & press Play!

Check out our [Documentation](https://mirror-networking.gitbook.io/) to learn how it all works.

If you are migrating from UNET, then please check out our [Migration Guide](https://mirror-networking.gitbook.io/docs/general/migration-guide).

## Made with Mirror
![Population: ONE](https://steamcdn-a.akamaihd.net/steam/apps/691260/header.jpg?t=1603846067)<br/>
[Population: ONE](http://www.populationonevr.com/)

![Zooba](https://i.imgur.com/4TY0XoY.png)<br/>
[Zooba](https://wildlifestudios.com/games/zooba/)

![SCP: Secret Laboratory](https://steamcdn-a.akamaihd.net/steam/apps/700330/header.jpg?t=1604668607)<br/>
[SCP: Secret Laboratory](https://store.steampowered.com/app/700330/SCP_Secret_Laboratory/)

![Naïca Online](https://i.imgur.com/VrBqvtz.png)<br/>
[Naïca Online](https://naicaonline.com/)

![Laurum Online](https://i.imgur.com/2I8wnxO.png)<br/>
[Laurum Online](https://laurum.online/)<br/>

And [many more](https://mirror-networking.com/showcase/)...

## Funding
Mirror is free & open source software funded by [Donations](https://github.com/sponsors/vis2k). If you love it, please consider supporting [Mirror on GitHub](https://github.com/sponsors/vis2k). As reward, you'll receive our [Network Profiler](https://mirror-networking.gitbook.io/docs/guides/network-profiler), priority support and more :)

## Benchmarks
* [uMMORPG 480 CCU worst case test](https://youtu.be/mDCNff1S9ZU) (everyone broadcasting to everyone else)
* [Latest Results](https://docs.google.com/document/d/1GMxcWAz3ePt3RioK8k4erpVSpujMkYje4scOuPwM8Ug/edit?usp=sharing)

## Development & Contributing
Mirror is used **in production** by games ranging from small indie projects to large scale MMOs that will run for a decade or more.

10 years from now if your players encounter a networking bug and most of our contributors already moved on, someone will need to fix it. Therefore it is of utmost importance for us to follow the [KISS principle](https://en.wikipedia.org/wiki/KISS_principle) in order for our games to survive.

Keeping the next decade in mind, contributing **fixes** / **tests** / **improvements** is highly appreciated while new features have a low probability of being merged.

_At this point, what we don't add to Mirror is more important than what we do add to it!_

# Bug Bounty
<img width="470" src="https://user-images.githubusercontent.com/16416509/110572995-718b5900-8195-11eb-802c-235c82a03bf7.png">

A lot of projects use Mirror in production. If you found a critical bug / exploit in Mirror core, please reach out to us in private.
Depending on the severity of the exploit, we offer $50 - $500 for now.
Rewards based on Mirror's [donations](https://github.com/sponsors/vis2k), capped at amount of donations we received that month.

**Specifically we are looking for:**
* Ways to crash a Mirror server
* Ways to exploit a Mirror server
* Ways to leave a Mirror server in undefined state

We are **not** looking for DOS/DDOS attacks. The exploit should be possible with just a couple of network packets, and it should be reproducible.

**Credits / past findings / fixes:**
* 2020, fholm: fuzzing ConnectMessage to stop further connects [[#2397](https://github.com/vis2k/Mirror/pull/2397)]