Java tutorial
/** * Copyright (c) 2014 Virtue Studios * * Permission is hereby granted, free of charge, to any person obtaining a copy * of this software and associated documentation files (the "Software"), to deal * in the Software without restriction, including without limitation the rights * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell * copies of the Software, and to permit persons to whom the Software is * furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice shall be included in all * copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE * SOFTWARE. */ package org.virtue.network.protocol.creation; import io.netty.buffer.ByteBuf; import io.netty.buffer.Unpooled; import io.netty.channel.ChannelHandlerContext; import io.netty.handler.codec.ByteToMessageDecoder; import java.math.BigInteger; import java.net.ProtocolException; import java.util.List; import org.virtue.Constants; import org.virtue.Virtue; import org.virtue.game.entity.player.GameState; import org.virtue.game.entity.player.LoginDispatcher; import org.virtue.game.entity.player.Player; import org.virtue.game.entity.player.PrivilegeLevel; import org.virtue.network.NetworkHandler; import org.virtue.network.protocol.ProtocolDecoder; import org.virtue.network.session.impl.GameSession; import org.virtue.utility.BufferUtility; import org.virtue.utility.ISAACCipher; import org.virtue.utility.XTEACipher; /** * @author Im Frizzy <skype:kfriz1998> * @since Oct 1, 2014 */ public class CreationDecoder extends ByteToMessageDecoder { /* (non-Javadoc) * @see io.netty.handler.codec.ByteToMessageDecoder#decode(io.netty.channel.ChannelHandlerContext, io.netty.buffer.ByteBuf, java.util.List) */ @Override protected void decode(ChannelHandlerContext ctx, ByteBuf buf, List<Object> out) throws Exception { if (!buf.isReadable()) { return; } int size = buf.readShort() & 0xFFFF; if (buf.readableBytes() < size) throw new IllegalStateException( "Not enough readable bytes from buffer! " + size + ", " + buf.readableBytes()); int major = buf.readShort(); int minor = buf.readShort(); if (major != Constants.FRAME_MAJOR && minor != Constants.FRAME_MINOR) { throw new ProtocolException("Invalid client version/sub-version! found: " + major + " " + minor + ", expected: " + Constants.FRAME_MAJOR + " " + Constants.FRAME_MINOR); } int secureBufferSize = buf.readShort() & 0xFFFF; if (buf.readableBytes() < secureBufferSize) { throw new IllegalStateException("Not enough readable bytes from buffer."); } byte[] secureBytes = new byte[secureBufferSize]; buf.readBytes(secureBytes); ByteBuf secureBuffer = Unpooled.wrappedBuffer(new BigInteger(secureBytes) .modPow(Constants.getLoginKey(), Constants.getLoginModulus()).toByteArray()); int block = secureBuffer.readByte() & 0xFF; if (block != 10) throw new ProtocolException("Invalid block opcode: " + block); int[] xteaKey = new int[4]; for (int i = 0; i < xteaKey.length; i++) xteaKey[i] = secureBuffer.readInt(); for (int i = 0; i < 10; i++) ; secureBuffer.readInt(); secureBuffer.readShort(); byte[] xteaBlock = new byte[buf.readableBytes()]; buf.readBytes(xteaBlock); XTEACipher xtea = new XTEACipher(xteaKey); xtea.decrypt(xteaBlock, 0, xteaBlock.length); ByteBuf xteaBuffer = Unpooled.wrappedBuffer(xteaBlock); String token = BufferUtility.readString(xteaBuffer); if (!token.equals(Constants.getJs5Token())) { throw new ProtocolException("Invalid creation token: " + token); } xteaBuffer.readShort(); xteaBuffer.readInt(); xteaBuffer.readInt(); BufferUtility.readString(xteaBuffer); xteaBuffer.readByte(); xteaBuffer.readByte(); int[] randomData = new int[24]; for (int index = 0; index < randomData.length; index++) { randomData[index] = xteaBuffer.readUnsignedByte(); } boolean stringIsNotNull = xteaBuffer.readByte() == 1; if (stringIsNotNull) BufferUtility.readString(xteaBuffer); xteaBuffer.readByte(); xteaBuffer.readByte(); xteaBuffer.readByte(); xteaBuffer.readByte(); xteaBuffer.readByte(); xteaBuffer.readByte(); xteaBuffer.readByte(); xteaBuffer.readByte(); xteaBuffer.readByte(); xteaBuffer.readShort(); xteaBuffer.readByte(); BufferUtility.getTriByte(xteaBuffer); xteaBuffer.readShort(); BufferUtility.readJagString(xteaBuffer); BufferUtility.readJagString(xteaBuffer); BufferUtility.readJagString(xteaBuffer); BufferUtility.readJagString(xteaBuffer); xteaBuffer.readByte(); xteaBuffer.readShort(); BufferUtility.readJagString(xteaBuffer); BufferUtility.readJagString(xteaBuffer); xteaBuffer.readByte(); xteaBuffer.readByte(); int[] tri = new int[3]; for (int index = 0; index < tri.length; index++) { tri[index] = xteaBuffer.readInt(); } xteaBuffer.readInt(); BufferUtility.readJagString(xteaBuffer); int[] serverKeys = new int[xteaKey.length]; for (int i = 0; i < serverKeys.length; i++) { serverKeys[i] = xteaKey[i] + 50; } Player player = new Player(ctx.channel(), new ISAACCipher(serverKeys), new ISAACCipher(xteaKey)); player.setGameState(GameState.CREATION); player.setPrivilgeLevel(PrivilegeLevel.PLAYER); player.initialize(false, Virtue.getInstance().getConfigProvider()); ctx.channel().writeAndFlush(Unpooled.buffer(1).writeByte(2)); ctx.channel().pipeline().remove(this); ctx.channel().pipeline().addFirst("decoder", new ProtocolDecoder(player.getDecodingCipher())); ctx.channel().attr(NetworkHandler.attachment).set(new GameSession(ctx.channel(), player)); player.getModel().setTemp(); player.getModel().sendBlock(true, Virtue.getInstance().getConfigProvider().getWearposDefaults()); LoginDispatcher.onAccountCreation(player); //out.add(new CreationRequestMessage(ctx.channel(), new ISAACCipher(serverKeys), new ISAACCipher(serverKeys))); } }