gistfile1.txt

import io.netty.bootstrap.Bootstrap;
import io.netty.buffer.ByteBuf;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.ChannelInboundHandlerAdapter;
import io.netty.channel.ChannelInitializer;
import io.netty.channel.ChannelOption;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.channel.socket.SocketChannel;
import io.netty.channel.socket.nio.NioSocketChannel;

import java.net.InetSocketAddress;

/**
 * @author Jire
 */
public final class Stress464 {

	public static final String HOST = "localhost";
	public static final int PORT = 43594;
	public static final int CONNECTIONS = 1999;

	public static void main(String[] args) {
		InetSocketAddress address = new InetSocketAddress(HOST, PORT);

		NioEventLoopGroup group = new NioEventLoopGroup();
		ChannelInitializer<SocketChannel> initializer = new ChannelInitializer<SocketChannel>() {
			@Override
			protected void initChannel(SocketChannel ch) throws Exception {
				ch.pipeline().addFirst(new ChannelInboundHandlerAdapter() {
					@Override
					public void channelActive(ChannelHandlerContext ctx) throws Exception {
						ByteBuf buf = ctx.alloc().buffer(1 + 1 + 1 + 4 + 1 + 1 + 4
								+ 4 + (4 * 16) + 1 + 1 + 4 + 8 + 8 + 1);

						// handshake
						buf.writeByte(14).writeByte(0);

						// revision
						buf.writeByte(15).writeInt(464);

						// login
						buf.writeByte(16).writeByte(0).writeInt(464).writeInt(0);
						for (int i = 0; i < 16; i++) buf.writeInt(0); // CRC-16 checksums
						buf.writeByte(0).writeByte(0); // ISAAC block length/ID
						buf.writeInt(1337); // uid
						buf.writeLong(convertStringToLong("test"));
						buf.writeBytes("password".getBytes()).writeByte(0);

						ctx.writeAndFlush(buf);
					}
				});
			}
		};

		for (int i = 0; i < CONNECTIONS; i++) {
			Bootstrap bs = new Bootstrap();
			bs.group(group).channel(NioSocketChannel.class)
					.option(ChannelOption.SO_KEEPALIVE, true)
					.handler(initializer).connect(address);
		}
	}

	private static long reducedMapping(int x) {
		long out = -1;
		if (x >= 97 && x <= 122)
			out = x - 96;
		else if (x >= 65 && x <= 90)
			out = x - 37;
		else if (x >= 48 && x <= 57)
			out = x - +5;
		else if (x == 32)
			out = 63L;
		return out;
	}

	private static long convertStringToLong(String s) {
		if (s.length() > 20) {
			throw new IllegalArgumentException("String is too long: " + s);
		}
		long out = 0L;
		for (int i = 0; i < s.length(); ++i) {
			long m = reducedMapping(s.codePointAt(i));
			if (m == -1) {
				throw new IllegalArgumentException("Unmapped Character in String: " + s);
			}
			m <<= ((9 - i) * 6) + 4;
			out |= m;
		}
		return out;
	}

}