Elena-Server

Library to implement an asynchronous distributed slave network.
The client source code is available here.

Description

This library permits to create an asynchronous distributed slave network. For instance, when you open a socket from the Elena server to another server (called target server), all the incoming and outgoing traffic pass through the client - you can see a client as a proxy. In a nutshell, the server controls all the clients’ network interactions and keeps all the processing fully hidden from the clients.
Note that this network mechanism could prevent the IP address blacklist.

Requirements

• jdk >= 1.8.0
• maven >= 3.3.9

Build

In the project directory, run

mvn clean install

If no error occurred, you have a new directory called “target” which contains a JAR file named “Elena-Server.jar”

Installation

Import this file as library to your current project.
(Ask Google if you don’t know how to import JAR library according to your IDE)

Usage

Event handling

You have to write a class which inherits EventHandler.

Then, you must override four methods :

void onHello(Client client, long timestamp, String hostname, String username);

This method will be called when the client will open a socket to Elena server.

Variables description

• client: Instance of Client class
• timestamp: Actual timestamp
• hostname: Not use
• username: Not use

void onSocketOpen(Client client, Socket socket, int errorCode);

This method will be called when the socket will be completely open between the client and the target server.

Variables description

• client: Current client
• socket: Current socket
• errorCode: Opening error code

void onSocketClose(Client client, Socket socket, int errorCode);

This method will be called when the socket will be completely close between client and the target server.

Variables description

• client: Current client
• socket: Current socket
• errorCode: Closing error code

void onRecv(Client client, Socket socket, byte[] data);

This method will be called when the client socket will receive new data from the target server.

Variables description

• client: Current client
• socket: Current socket
• data: Data received

If you are in trouble with your class implementation, you have an example here.

Protocol

Now, you can write the protocol that your clients will follow.

For that, you have to interact with some methods :

Client class

void openSocket(String host, int port);

This method will open a socket.

Variables description

• host: Target server URL or IP address
• port: Target server port

Socket class

void write(byte[] data);

This methods will send data in the socket.

Variables description

• data: Data to send

void close();

This method will close the socket.

You can check some examples out by clicking here.

Initialization

You have to declare a Server instance with your previous class in parameter.

Server server = new Server(yourClass);

TODO

• Implement SSL handshake and CA verification
• Add customizable data in Client class
• Add customizable data in Socket class

Contact

If you have any question about the project, feel free to contact me on Twitter: @bla5r