net.marfgamer.jraknet.server.RakNetServerHandler.java Source code

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Here is the source code for net.marfgamer.jraknet.server.RakNetServerHandler.java

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/*
 *       _   _____            _      _   _          _   
 *      | | |  __ \          | |    | \ | |        | |  
 *      | | | |__) |   __ _  | | __ |  \| |   ___  | |_ 
 *  _   | | |  _  /   / _` | | |/ / | . ` |  / _ \ | __|
 * | |__| | | | \ \  | (_| | |   <  | |\  | |  __/ | |_ 
 *  \____/  |_|  \_\  \__,_| |_|\_\ |_| \_|  \___|  \__|
 *                                                  
 * the MIT License (MIT)
 *
 * Copyright (c) 2016, 2017 Trent "MarfGamer" Summerlin
 *
 * 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 net.marfgamer.jraknet.server;

import java.net.InetAddress;
import java.net.InetSocketAddress;
import java.util.HashMap;

import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.ChannelInboundHandlerAdapter;
import io.netty.channel.socket.DatagramPacket;
import net.marfgamer.jraknet.RakNetLogger;
import net.marfgamer.jraknet.RakNetPacket;

/**
 * Used by the <code>RakNetServer</code> with the sole purpose of sending
 * received packets to the server so they can be handled.
 *
 * @author Trent "MarfGamer" Summerlin
 */
public class RakNetServerHandler extends ChannelInboundHandlerAdapter {

    // Handler data
    private final String loggerName;
    private final RakNetServer server;
    private final HashMap<InetAddress, BlockedAddress> blocked;
    private InetSocketAddress causeAddress;

    /**
     * Constructs a <code>RakNetClientServer</code> with the specified
     * <code>RakNetClient</code>.
     * 
     * @param server
     *            the <code>RakNetServer</code> to send received packets to.
     */
    public RakNetServerHandler(RakNetServer server) {
        this.loggerName = "server handler #" + server.getGloballyUniqueId();
        this.server = server;
        this.blocked = new HashMap<InetAddress, BlockedAddress>();
    }

    /**
     * Blocks the specified address with the specified reason for the specified
     * amount time.
     * 
     * @param address
     *            the address to block.
     * @param reason
     *            the reason the address was blocked.
     * @param time
     *            how long the address will be blocked in milliseconds.
     */
    public void blockAddress(InetAddress address, String reason, long time) {
        blocked.put(address, new BlockedAddress(System.currentTimeMillis(), time));
        server.getListener().onAddressBlocked(address, reason, time);
        RakNetLogger.info(loggerName,
                "Blocked address " + address + " due to \"" + reason + "\" for " + time + " milliseconds");
    }

    /**
     * Unblocks the specified address.
     * 
     * @param address
     *            the address to unblock.
     */
    public void unblockAddress(InetAddress address) {
        blocked.remove(address);
        server.getListener().onAddressUnblocked(address);
        RakNetLogger.info(loggerName, "Unblocked address " + address);
    }

    /**
     * @param address
     *            the address to check.
     * @return whether or not the specified address is blocked.
     */
    public boolean addressBlocked(InetAddress address) {
        return blocked.containsKey(address);
    }

    @Override
    public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception {
        if (msg instanceof DatagramPacket) {
            // Get packet and sender data
            DatagramPacket datagram = (DatagramPacket) msg;
            InetSocketAddress sender = datagram.sender();
            RakNetPacket packet = new RakNetPacket(datagram);

            // If an exception happens it's because of this address
            this.causeAddress = sender;

            // Is the sender blocked?
            if (this.addressBlocked(sender.getAddress())) {
                BlockedAddress status = blocked.get(sender.getAddress());
                if (status.getTime() <= BlockedAddress.PERMANENT_BLOCK) {
                    return; // Permanently blocked
                }
                if (System.currentTimeMillis() - status.getStartTime() < status.getTime()) {
                    return; // Time hasn't expired
                }
                this.unblockAddress(sender.getAddress());
            }

            // Handle the packet and release the buffer
            server.handleMessage(packet, sender);
            datagram.content().readerIndex(0); // Reset position
            RakNetLogger.debug(loggerName, "Sent packet to server and reset Datagram buffer read position");
            server.getListener().handleNettyMessage(datagram.content(), sender);
            datagram.content().release(); // No longer needed
            RakNetLogger.debug(loggerName, "Sent Datagram buffer to server and released it");

            // No exceptions occurred, release the suspect
            this.causeAddress = null;
        }
    }

    @Override
    public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) {
        server.handleHandlerException(this.causeAddress, cause);
    }

}