IpSubnetFilterExample Class — netty Architecture

Source Code

example/src/main/java/io/netty/example/ipfilter/IpSubnetFilterExample.java lines 42–89

public final class IpSubnetFilterExample {

    static final int PORT = Integer.parseInt(System.getProperty("port", "8009"));

    public static void main(String[] args) throws Exception {
        EventLoopGroup group = new MultiThreadIoEventLoopGroup(NioIoHandler.newFactory());

        try {
            List<IpSubnetFilterRule> rules = new ArrayList<IpSubnetFilterRule>();

            // Reject 10.10.10.0/24 and 192.168.0.0/16 ranges but accept the rest
            rules.add(new IpSubnetFilterRule("10.10.10.0", 24, IpFilterRuleType.REJECT));
            rules.add(new IpSubnetFilterRule("192.168.0.0", 16, IpFilterRuleType.REJECT));

            // Share this same Handler instance with multiple ChannelPipeline(s).
            final IpSubnetFilter ipFilter = new IpSubnetFilter(rules);

            ServerBootstrap b = new ServerBootstrap();
            b.group(group)
                    .channel(NioServerSocketChannel.class)
                    .handler(new LoggingHandler(LogLevel.INFO))
                    .childHandler(new ChannelInitializer<SocketChannel>() {
                        @Override
                        public void initChannel(SocketChannel ch) {
                            ChannelPipeline p = ch.pipeline();
                            p.addFirst(ipFilter);

                            p.addLast(new SimpleChannelInboundHandler<ByteBuf>() {
                                @Override
                                protected void channelRead0(ChannelHandlerContext ctx, ByteBuf msg) throws Exception {
                                    System.out.println("Received data from: " + ctx.channel().remoteAddress());
                                }
                            });
                        }
                    });

            // Bind and start to accept incoming connections.
            ChannelFuture f = b.bind(PORT).sync();

            // Wait until the server socket is closed.
            // In this example, this does not happen, but you can do that to gracefully
            // shut down your server.
            f.channel().closeFuture().sync();
        } finally {
            group.shutdownGracefully();
        }
    }
}