Open-source alternative to the traditional Mantle program, allowing you to pull capes from any number of hosted cape servers.
To run this program, please grab the latest release from here. You will need the .NET 6 SDK, which you can get from here.
Please run this before opening any Minecraft instances. You have to run these commands (i.e. dotnet Uranometrical.OpenMantleProxy.dll ...) through the command line, as well. Be open your cmd process with admin privileges, as it is required to allow modifications to be made to the hosts file.
If you would rather not use the command line, I have provided .bat scripts (for Windows) and .sh scripts (for *Nix) as an alternative. .sh scripts must be ran as root, but .bat scripts will instead prompt the user for admin privileges.
OpenMantleProxy starts a local HTTP server to process any received requests. After starting the HTTP server, OpenMantleProxy modifies the computer's hosts file to redirect any s.optifine.net (OptiFine cape server) requests to the newly-opened HTTP server. Different modes will make the redirect function differently.
Due to the requirement of modifying the computer's hosts file, it is more than likely that the program will require administrator privileges on any Windows operating system, and root on *Nix.
To start a server, run dotnet Uranometrical.OpenMantleProxy.dll server. Please read the "Modes" section to understand which one is best for you.
Use a mode by appending --mode (optionally, -m) to the command above, followed by the mode's name.
There are four different proxy modes in OpenMantleProxy, detailed below:
mantle is the default mode, and reroutes all s.optifine.net requests to capes.mantle.gg. This is the same behavior as regular Mantle.
optimantle initially sends an HTTP request to s.optifine.net. If a cape is not resolved, then an HTTP request is sent to capes.mantle.gg.
mantlefine functions identically to optimantle, just in reverse.
custom ignores any predefined servers and instead expects an additional input (--servers/-s), which it will pull from for capes instead.
Additional servers are specified in this syntax: --servers your.cape.sever another.cape.server capes.mantle.gg s.optifine.net. In this example, your.cape.server will be tried first, then another.cape.server, etc.
OpenMantleProxy only establishes connections to servers capes.mantle.gg, s.optifine.net, and whatever additional servers you specify. As long as these domains remain safe moving forward (essentially assuming no malicious third party takes control of either domain), there are no security risks. Always be safe while installing software online, however, as this program does require elevated permissions. If you do not feel a binary release is safe, please compile this program manually after throughly examining its code.
OpenMantleProxy can be used with any Minecraft client that uses OptiFine without fear of breaking the client's Terms of Service. Clients such as Lunar like to claim that Mantle violates their terms, but it doesn't, as Mantle does not touch Lunar. It modifies core OS functionalities. This is the same for OpenMantleProxy.
Mantle's terms do not prevent third-party programs from accessing their website or its contents, as well.
OptiFine does not have any restrictions either.
Installation automatically occurs when launching OpenMantleProxy with server.
Full example: dotnet Uranometrical.OpenMantleProxy.dll server --mode optimantle
Run OpenMantleProxy with the clean option (instead of server) (dotnet Uranometrical.OpenMantleProxy.dll clean) to scrub away any residue left by Mantle or OpenMantleProxy (removes any redirects from s.optifine.net).
Simply clone the repository:
$ git clone https://github.com/uranometrical/openmantleproxyMove into the ./src directory:
$ cd openmantleproxy/srcAnd build the project:
$ dotnet build Uranometrical.OpenMantleProxy.sln -c Release