The main repository for the Darkflame Universe Server Emulator project.
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Gie "Max" Vanommeslaeghe 2c70f1503c
Merge pull request #1616 from DarkflameUniverse/behavior
fix: add larger behavior fields for saving
2024-07-17 22:24:52 +02:00
.github chore: upgrade MacOS build settings for better C++20 compatibility (#1435) 2024-01-29 21:45:50 -06:00
cmake chore: remove json (#1561) 2024-05-02 06:35:55 -05:00
dAuthServer refactor: Change TryParse implementation (#1442) 2024-02-10 05:05:25 -06:00
dChatFilter replace white and blacklist (#1530) 2024-04-05 00:51:40 -05:00
dChatServer fix: use after free and uninitialized memory (#1603) 2024-05-30 23:53:03 -05:00
dCommon Merge pull request #1595 from DarkflameUniverse/issue-462 2024-06-11 20:48:09 +02:00
dDatabase feat: add admin account creation options from cli (GM level) (#1620) 2024-07-03 15:37:19 -07:00
dGame Merge pull request #1614 from DarkflameUniverse/tea 2024-07-17 22:24:17 +02:00
dMasterServer feat: add admin account creation options from cli (GM level) (#1620) 2024-07-03 15:37:19 -07:00
dNavigation fix: Falling Off Edge in Pet Puzzle (#1584) 2024-05-21 20:01:44 -05:00
dNet Fix g++ 14 (#1610) 2024-06-06 04:00:44 -05:00
docs fix: plaques would crash when interacting with no data provided (#1486) 2024-03-04 06:00:34 -06:00
dPhysics const return oversight (#1532) 2024-04-05 01:14:52 -07:00
dScripts Chore: split VE script up (#1598) 2024-05-27 01:24:48 -05:00
dServer fix: Dissolve more CMake dependencies (#1387) 2024-03-05 20:13:24 -06:00
dWorldServer fix: use after free and uninitialized memory (#1603) 2024-05-30 23:53:03 -05:00
dZoneManager feat: Add MovingAI pathing for NPCs without combatAI (#1509) 2024-03-26 21:06:22 -05:00
migrations Create 16_big_behaviors.sql 2024-06-17 19:41:27 -07:00
resources replace white and blacklist (#1530) 2024-04-05 00:51:40 -05:00
tests chore: Nitpicking-utils (#1549) 2024-04-14 23:14:54 -07:00
thirdparty Fix g++ 14 (#1610) 2024-06-06 04:00:44 -05:00
vanity fv race place atm (#1570) 2024-05-13 06:18:27 -05:00
.dockerignore fix: improve our docker config (#1373) 2024-01-03 02:36:17 -06:00
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.env.example fix: Docker Compose README (#1403) 2024-01-08 09:13:28 -06:00
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.gitignore Add config update function (#1379) 2024-01-02 18:25:57 -06:00
.gitmodules fix: improve our docker config (#1373) 2024-01-03 02:36:17 -06:00 Add note for compiling with multiple jobs (#948) 2023-01-17 13:26:50 -06:00
CMakeLists.txt prevent building in a folder which contains spaces (#1583) 2024-05-16 08:05:57 -05:00
CMakePresets.json chore: upgrade MacOS build settings for better C++20 compatibility (#1435) 2024-01-29 21:45:50 -06:00
CMakeVariables.txt chore: Bump verion to 2.3.0 (#1564) 2024-05-10 15:21:10 -05:00 blame ignore and contributing update 2022-07-28 08:47:28 -05:00
docker-compose.yml Use volume for mariadb persistence (#1555) 2024-04-29 22:51:13 +02:00
Dockerfile Fix Dockerfile vanity COPY (#1604) 2024-05-27 17:46:09 -07:00 fix: improve our docker config (#1373) 2024-01-03 02:36:17 -06:00
LICENSE Public release of the DLU server code! 2021-12-05 18:54:36 +01:00
logo.png Public release of the DLU server code! 2021-12-05 18:54:36 +01:00 Update (#1518) 2024-03-28 21:32:46 -05:00 Update 2022-07-31 15:14:16 +02:00
systemd.example chore: Notes for running as system service (#1252) 2023-11-08 19:15:46 -08:00
versions.txt chore: Bump verion to 2.3.0 (#1564) 2024-05-10 15:21:10 -05:00

Darkflame Universe


Darkflame Universe (DLU) is a server emulator for LEGO® Universe. Development started in 2013 and has gone through multiple iterations and is now able to present a near perfect emulation of the game server.

LEGO® Universe

Developed by NetDevil and The LEGO Group, LEGO® Universe launched in October 2010 and ceased operation in January 2012.


Darkflame Universe is licensed under AGPLv3, please read LICENSE. Some important points:

  • We are not liable for anything you do with the code
  • The code comes without any warranty what so ever
  • You must disclose any changes you make to the code when you distribute it
  • Hosting a server for others counts as distribution


Setup difficulty

Throughout the entire build and setup process a level of familiarity with the command line and preferably a Unix-like development environment is greatly advantageous.

Hosting a server

We do not recommend hosting public servers. Darkflame Universe is intended for small scale deployment, for example within a group of friends. It has not been tested for large scale deployment which comes with additional security risks.

Supply of resource files

Darkflame Universe is a server emulator and does not distribute any LEGO® Universe files. A separate game client is required to setup this server emulator and play the game, which we cannot supply. Users are strongly suggested to refer to the safe checksums listed here to see if a client will work.

Step by step walkthrough for a single-player server

If you would like a setup for a single player server only on a Windows machine, use the Native Windows Setup Guide by HailStorm and skip this README.

Steps to setup server

Clone the repository

If you are on Windows, you will need to download and install git from here

Then run the following command

git clone --recursive

Install dependencies

Windows packages

Ensure that you have either the MSVC C++ compiler (recommended) or the Clang compiler installed. You'll also need to download and install CMake (version CMake version 3.25 or later!).

MacOS packages

Ensure you have brew installed. You will need to install the following packages

brew install cmake gcc mariadb openssl zlib

Linux packages

Make sure packages like gcc, and zlib are installed. Depending on the distribution, these packages might already be installed. Note that on systems like Ubuntu, you will need the zlib1g-dev package so that the header files are available. libssl-dev will also be required as well as openssl. You will also need a MySQL database solution to use. We recommend using mariadb-server.

For Ubuntu, you would run the following commands. On other systems, the package install command will differ.

sudo apt update && sudo apt upgrade

# Install packages
sudo apt install build-essential gcc zlib1g-dev libssl-dev openssl mariadb-server cmake

Required CMake version

This project uses CMake version 3.25 or higher and as such you will need to ensure you have this version installed. You can check your CMake version by using the following command in a terminal.

cmake --version

If you are going to be using an Ubuntu environment to run the server, you may need to get a more recent version of cmake than the packages available may provide.

The general approach to do so would be to obtain a copy of the signing key and then add the CMake repository to your apt. You can do so with the following commands.

Source of the below commands

# Remove the old version of CMake
sudo apt purge --auto-remove cmake

# Prepare for installation
sudo apt update && sudo apt install -y software-properties-common lsb-release && sudo apt clean all

# Obtain a copy of the signing key
wget -O - 2>/dev/null | gpg --dearmor - | sudo tee /etc/apt/trusted.gpg.d/kitware.gpg >/dev/null

# Add the repository to your sources list.
sudo apt-add-repository "deb $(lsb_release -cs) main"

# Next you'll want to ensure that Kitware's keyring stays up to date
sudo apt update
sudo apt install kitware-archive-keyring
sudo rm /etc/apt/trusted.gpg.d/kitware.gpg

# If sudo apt update above returned an error, copy the public key at the end of the error message and run the following command
# if the error message was "The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 6AF7F09730B3F0A4"
# then the below command would be "sudo apt-key adv --keyserver --recv-keys 6AF7F09730B3F0A4"
sudo apt-key adv --keyserver --recv-keys <TheCopiedPublicKey>

# Finally update and install
sudo apt update
sudo apt install cmake

Database setup

First you'll need to start MariaDB.

For Windows the service is always running by default.

For MacOS, run the following command

brew services start mariadb

For Linux, run the following command

sudo systemctl start mysql
# If systemctl is not a known command on your distribution, try the following instead
sudo service mysql start

You will need to run this command every time you restart your environment

If you are using Linux and systemctl and want the MariaDB instance to start on startup, run the following command

sudo systemctl enable --now mysql

Once MariaDB is started, you'll need to create a user and an empty database for Darkflame Universe to use.

First, login to the MariaDB instance.

To do this on Ubuntu/Linux, MacOS, or another Unix like operating system, run the following command in a terminal

# Logs you into the MariaDB instance as root
sudo mysql

For Windows, run the following command in the Command Prompt (MariaDB xx.xx) terminal

# Logs you into the mysql instance
mysql -u root -p
# You will then be prompted for the password you set for root during installation of MariaDB

Now that you are logged in, run the following commands.

# Creates a user for this computer which uses a password and grant said user all privileges.
# Change mydarkflameuser to a custom username and password to a custom password. 
GRANT ALL ON *.* TO 'mydarkflameuser'@'localhost' IDENTIFIED BY 'password' WITH GRANT OPTION;

# Then create a database for Darkflame Universe to use.

Build the server

You can either run when in the root folder of the repository:


Or manually run the commands used in

If you would like to build the server faster, append -j<number> where number is the number of simultaneous compile jobs to run at once. It is recommended that you have this number always be 1 less than your core count to prevent slowdowns. The command would look like this if you would build with 4 jobs at once:

./ -j4


Depending on your operating system, you may need to adjust some pre-processor defines in CMakeVariables.txt before building:

  • If you are on MacOS, ensure OPENSSL_ROOT_DIR is pointing to the openssl root directory.
  • If you are using a Darkflame Universe client, ensure client_net_version in build/sharedconfig.ini is changed to 171023.

Configuring your server

This server has a few steps that need to be taken to configure the server for your use case.

Required Configuration

Darkflame Universe can run with either a packed or an unpacked client. Navigate to build/sharedconfig.ini and fill in the following fields:

  • mysql_host (This is the IP address or hostname of your MariaDB server. This is highly likely localhost)
    • If you setup your MariaDB instance on a port other than 3306, which can be done on a Windows install, you will need to make this value tcp://localhost:portNum where portNum is replaced with the port you chose to run MariaDB on.
  • mysql_database (This is the database you created for the server)
  • mysql_username (This is the user you created for the server)
  • mysql_password (This is the password for the user you created for the server)
  • client_location (This is the location of the client files. This should be the folder path of a packed or unpacked client)
    • Ideally the path to the client should not contain any spaces.

Optional Configuration

  • After the server has been built there should be five ini files in the build directory: sharedconfig.ini, authconfig.ini, chatconfig.ini, masterconfig.ini, and worldconfig.ini.
  • authconfig.ini contains an option to enable or disable play keys on your server. Do not change the default port for auth.
  • chatconfig.ini contains a port option.
  • masterconfig.ini contains options related to permissions you want to run your servers with.
  • sharedconfig.ini contains several options that are shared across all servers
  • worldconfig.ini contains several options to turn on QOL improvements should you want them. If you would like the most vanilla experience possible, you will need to turn some of these settings off.

Verify your setup

Your build directory should now look like this:

  • AuthServer
  • ChatServer
  • MasterServer
  • WorldServer
  • authconfig.ini
  • chatconfig.ini
  • masterconfig.ini
  • sharedconfig.ini
  • worldconfig.ini
  • ...

Running the server

If everything has been configured correctly you should now be able to run the MasterServer binary which is located in the build directory. Darkflame Universe utilizes port numbers under 1024, so under Linux you either have to give the AuthServer binary network permissions or run it under sudo. To give AuthServer network permissions and not require sudo, run the following command

sudo setcap 'cap_net_bind_service=+ep' AuthServer

and then go to build/masterconfig.ini and change use_sudo_auth to 0.

Linux Service

If you are running this on a linux based system, it will use your terminal to run the program interactively, preventing you using it for other tasks and requiring it to be open to run the server.
Note: You could use screen or tmux instead for virtual terminals
To run the server non-interactively, we can use a systemctl service by copying the following file:

cp ./systemd.example /etc/systemd/system/darkflame.service

Make sure to edit the file in /etc/systemd/system/darkflame.service and change the:

  • User and Group to the user that runs the darkflame server.
  • ExecPath to the full file path of the server executable.

To register, enable and start the service use the following commands:

  • Reload the systemd manager configuration to make it aware of the new service file:
systemctl daemon-reload
  • Start the service:
systemctl start darkflame.service
  • Enable OR disable the service to start on boot using:
systemctl enable darkflame.service
systemctl disable darkflame.service
  • Verify that the service is running without errors:
systemctl status darkflame.service
  • You can also restart, stop, or check the logs of the service using journalctl
systemctl restart darkflame.service
systemctl stop darkflame.service
journalctl -xeu darkflame.service

First admin user

Run MasterServer -a to get prompted to create an admin account. This method is only intended for the system administrator as a means to get started, do NOT use this method to create accounts for other users!

Account management tool (Nexus Dashboard)

If you are just using this server for yourself, you can skip setting up Nexus Dashboard

Follow the instructions here to setup the DLU Nexus Dashboard web application. This is the intended way for users to create accounts and the intended way for moderators to approve names/pets/properties and do other moderation actions.

Admin levels

The admin level, or Game Master level (hereafter referred to as gmlevel), is specified in the accounts.gm_level column in the MySQL database. Normal players should have this set to 0, which comes with no special privileges. The system administrator will have this set to 9, which comes will all privileges. gmlevel 8 should be used to give a player a majority of privileges without the safety critical once.

While a character has a gmlevel of anything but 0, some gameplay behavior will change. When testing gameplay, you should always use a character with a gmlevel of 0.

User guide

Some changes to the client boot.cfg file are needed to play on your server.

Allowing a user to connect to your server

To connect to a server follow these steps:

  • In the client directory, locate boot.cfg
  • Open it in a text editor and locate where it says AUTHSERVERIP=0:
  • Replace the contents after to : and the following , with what you configured as the server's public facing IP. For example AUTHSERVERIP=0:localhost for locally hosted servers
  • Next locate the line UGCUSE3DSERVICES=7:
  • Ensure the number after the 7 is a 0
  • Launch legouniverse.exe, through wine if on a Unix-like operating system
  • Note that if you are on WSL2, you will need to configure the public IP in the server and client to be the IP of the WSL2 instance and not localhost, which can be found by running ifconfig in the terminal. Windows defaults to WSL1, so this will not apply to most users.

Updating your server

To update your server to the latest version navigate to your cloned directory

cd path/to/DarkflameServer

Run the following commands to update to the latest changes

git pull
git submodule update --init --recursive

Now follow the build section for your system and your server is up to date.

In-game commands

  • A list of all in-game commands can be found here.

Verifying your client files

LEGO® Universe 1.10.64

To verify that you are indeed using a LEGO® Universe 1.10.64 client, make sure you have the full client compressed in a rar file and run the following command.

# Replace <file> with the file path to the zipped client

# If on Linux or MacOS
shasum -a 256 <file>

# If on Windows using the Command Prompt
certutil -hashfile <file> SHA256

Below are known good SHA256 checksums of the client:

  • 8f6c7e84eca3bab93232132a88c4ae6f8367227d7eafeaa0ef9c40e86c14edf5 (packed client, rar compressed)
  • c1531bf9401426042e8bab2de04ba1b723042dc01d9907c2635033d417de9e05 (packed client, includes extra locales, rar compressed)
  • 0d862f71eedcadc4494c4358261669721b40b2131101cbd6ef476c5a6ec6775b (unpacked client, includes extra locales, rar compressed)

If the returned hash matches one of the lines above then you can continue with setting up the server. If you are using a fully downloaded and complete client from live, then it will work, but the hash above may not match. Otherwise you must obtain a full install of LEGO® Universe 1.10.64. You must also make absolutely sure your LEGO Universe client is not in a Windows OneDrive. DLU is not and will not support a client being stored in a OneDrive, so ensure you have moved the client outside of that location.

Darkflame Universe Client

Darkflame Universe clients identify themselves using a higher version number than the regular live clients out there. This was done make sure that older and incomplete clients wouldn't produce false positive bug reports for us, and because we made bug fixes and new content for the client.

To verify that you are indeed using a Darkflame Universe client, make sure you have the full client compressed in a zip file and run the following command.

# Replace <file> with the file path to the zipped client

# If on Linux or MacOS
shasum -a 1 <file>

# If on Windows using the Command Prompt
certutil -hashfile <file> SHA1

Known good SHA1 checksum of the Darkflame Universe client:

  • 91498e09b83ce69f46baf9e521d48f23fe502985 (packed client, zip compressed)


The Darkflame Server is automatically built and published as a Docker Container / OCI Image to the GitHub Container Registry at:



It seems that Docker Desktop on Windows with the WSL 2 backend has some issues with MariaDB (c.f. mariadb-docker#331) triggered by NexusDashboard migrations, so this setup may not work for you. If that is the case, please tell us about your setup in NexusDashboard#92.

You can use the docker-compose tool to setup a MariaDB database, run the Darkflame Server and manage it with Nexus Dashboard all at once. For that:

  • Install Docker Desktop
  • Open the directory that contains your LU Client
    • If the legouniverse.exe is in a subfolder called client, you're good to go. There may also be a folder versions.
    • Otherwise, create a new client folder and move the exe and everything else (e.g. res and locale) in there. This is necessary to work around a bug in the client that will prevent that you to log back in after getting disconnected.
  • Download the docker-compose.yml file and place it next to client.
  • Download the .env.example file and place it next to client with the file name .env
    • You may get warnings that this name starts with a dot, acknowledge those, this is intentional. Depending on your operating system, you may need to activate showing hidden files (e.g. Ctrl-H in Gnome on Linux) and/or file extensions ("File name extensions" in the "View" tab on Windows).
    • Update the ACCOUNT_MANAGER_SECRET and MARIADB_PASSWORD with strong random passwords.
      • Use a password generator like
      • Avoid : and @ characters
      • Once the database user is created, changing the password will not update it, so the server will just fail to connect.
    • Set EXTERNAL_IP to your LAN IP or public IP if you want to host the game for friends & family
  • Open a terminal in the folder with the docker-compose.yml and client
  • Run docker compose up -d
    • This might require sudo on Linux, and a recent version of docker compose
  • Run docker exec -it dlu-darkflameserver-1 /app/MasterServer -a and follow the instructions to create the initial admin account
  • Open http://localhost:8000 to access Nexus Dashboard with the admin account to create normal users
  • Set AUTHSERVERIP=0:localhost in client/boot.cfg
    • Replace localhost with the value of EXTERNAL_IP if you changed that earlier.
    • Also make sure UGCUSE3DSERVICES=7: is set to 0
  • Launch legouniverse.exe


This assumes that you have a database deployed to your host or in another docker container.

A basic deployment of this contianer would look like:

# example docker contianer deployment
docker run -it \
    -v /path/to/configs/:/app/configs \
    -v /path/to/logs/:/app/logs \
    -v /path/to/dumps/:/app/dumps \
    -v /path/to/res:/app/res:ro \
    -v /path/to/resServer:/app/resServer \
    -e DUMP_FOLDER=/app/dumps \
    -p 1001:1001/udp \
    -p 2005:2005/udp \
    -p 3000-3300:3000-3300/udp \

You will need to replace the /path/to/'s to reflect the paths on your host.

Any config option in the .ini's can be overridden with environmental variables: Ex: log_to_console=1 from shared_config.ini would be overidden like -e LOG_TO_CONSOLE=0

Development Documentation

This is a Work in Progress, but below are some quick links to documentaion for systems and structs in the server Networked message structs General system documentation


DLU Team

Research and Tools

Community Management

  • Cole Peterson (BlasterBuilder)

Active Contributors

Former Contributors

  • TheMachine
  • Matthew
  • Raine
  • Bricknave

Special Thanks