时间：2023-02-10 15:33:01 | 来源：建站知识
时间：2023-02-10 15:33:01 来源：建站知识
DNS协议作为着互联网客户端-服务器通信模式得第一关，在当下每天都有成千上亿上网记录产生得当今社会，其重要性自然不可言喻。在国内比较有名得DNS服务器有电信得114.114.114.114、阿里云得223.5.5.5，DNSPod得119.29.29.29，配置一个好的DNS服务器可以缩短请求响应时间、降低DNS劫持概率，提升上网体验。上面这些都是互联网公用DNS服务器，本文博主教大家使用
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Java Netty 自建DNS代理服务器，目前网上对于使用Netty自建DNS服务器得教程良莠不齐，大多没有代理步骤，达不到博主想要得代理效果，因而创建此文。resources 文件夹下添加 black_list.txt 文件google.com.facebook.com.初始化 BLACK_LIST_DOMAINprivate static final List<String> BLACK_LIST_DOMAIN = new ArrayList<>(); static { String s; try (InputStream is = DnsServer.class.getClassLoader().getResourceAsStream("black_list.txt"); BufferedReader br = new BufferedReader(new InputStreamReader(is))) { while (StrUtil.isNotBlank(s = br.readLine())) { BLACK_LIST_DOMAIN.add(s); } } catch (Exception e) { log.error(e.getMessage(), e); } }UDP 协议绑定本机53端口，并初始化 ProxyUdp DNS请求代理对象@Slf4jpublic final class DnsServer { private static final List<String> BLACK_LIST_DOMAIN = new ArrayList<>(); static { ... } public static void main(String[] args) throws Exception { ProxyUdp proxyUdp = new ProxyUdp(); proxyUdp.init(); final int[] num = {0}; final NioEventLoopGroup group = new NioEventLoopGroup(); Bootstrap bootstrap = new Bootstrap(); bootstrap.group(group).channel(NioDatagramChannel.class) .handler(new ChannelInitializer<NioDatagramChannel>() { @Override protected void initChannel(NioDatagramChannel nioDatagramChannel) { nioDatagramChannel.pipeline().addLast(...); } }).option(ChannelOption.SO_BROADCAST, true); int port = 53; ChannelFuture future = bootstrap.bind(port).addListener(future1 -> { log.info("server listening port:{}", port); }); future.channel().closeFuture().addListener(future1 -> { if (future.isSuccess()) { log.info(future.channel().toString()); } }); }}nioDatagramChannel.pipeline() 添加 ChannelHandlernioDatagramChannel.pipeline().addLast(new DatagramDnsQueryDecoder()); nioDatagramChannel.pipeline().addLast(new SimpleChannelInboundHandler<DatagramDnsQuery>() { @Override protected void channelRead0(ChannelHandlerContext ctx, DatagramDnsQuery msg) { try { DefaultDnsQuestion dnsQuestion = msg.recordAt(DnsSection.QUESTION); String name = dnsQuestion.name(); log.info(name + ++num[0]); Channel channel = ctx.channel(); int id = msg.id(); channel.attr(AttributeKey.<DatagramDnsQuery>valueOf(String.valueOf(id))).set(msg); if (BLACK_LIST_DOMAIN.contains(name)) { DnsQuestion question = msg.recordAt(DnsSection.QUESTION); DatagramDnsResponse dnsResponse = getDatagramDnsResponse(msg, id, question); channel.writeAndFlush(dnsResponse); return; } proxyUdp.send(name, msg.id(), channel); } catch (Exception e) { log.error(e.getMessage(), e); } } private DatagramDnsResponse getDatagramDnsResponse(DatagramDnsQuery msg, int id, DnsQuestion question) { DatagramDnsResponse dnsResponse = new DatagramDnsResponse(msg.recipient(), msg.sender(), id); dnsResponse.addRecord(DnsSection.QUESTION, question); DefaultDnsRawRecord queryAnswer = new DefaultDnsRawRecord( question.name(), DnsRecordType.A, 600, Unpooled.wrappedBuffer(new byte[]{(byte) 192, (byte) 168, 1, 1})); dnsResponse.addRecord(DnsSection.ANSWER, queryAnswer); return dnsResponse; } @Override public void exceptionCaught(ChannelHandlerContext ctx, Throwable e) { log.error(e.getMessage(), e); } }); nioDatagramChannel.pipeline().addLast(new DatagramDnsResponseEncoder());在 new SimpleChannelInboundHandler<DatagramDnsQuery>() 中 解析客户端DNS查询报文, 获取访问域名信息，如果访问域名在黑名单中，则通过 getDatagramDnsResponse() 直接返回 192.168.1.1 的DNS响应报文，反之则通过 proxyUdp 对象转发DNS查询。ProxyUdp 作为DNS查询代理类会通过 send(String domain, int id, Channel serverChannel) 方法传入DnsServer类收到的访问域名、DNS事务ID、serverChannel。随后包装访问域名请求DNS服务器114.114.114.114，最后通过 new SimpleChannelInboundHandler<DatagramDnsResponse>() 将收到的DNS响应报文通过上一步传入得 serverChannel 输出到客户端。@Slf4jclass ProxyUdp { private Channel serverChannel; private Channel proxyChannel; public void init() throws InterruptedException { EventLoopGroup proxyGroup = new NioEventLoopGroup(); Bootstrap b = new Bootstrap(); b.group(proxyGroup) .channel(NioDatagramChannel.class) .handler(new ChannelInitializer<DatagramChannel>() { @Override protected void initChannel(DatagramChannel ch) { ChannelPipeline p = ch.pipeline(); p.addLast(new DatagramDnsQueryEncoder()) .addLast(new DatagramDnsResponseDecoder()) .addLast(new SimpleChannelInboundHandler<DatagramDnsResponse>() { @Override public void channelActive(ChannelHandlerContext ctx) { log.info(ctx.channel().toString()); } @Override protected void channelRead0(ChannelHandlerContext ctx, DatagramDnsResponse msg) { DatagramDnsQuery dnsQuery = localChannel.attr(AttributeKey.<DatagramDnsQuery>valueOf(String.valueOf(msg.id()))).get(); DnsQuestion question = msg.recordAt(DnsSection.QUESTION); DatagramDnsResponse dnsResponse = new DatagramDnsResponse(dnsQuery.recipient(), dnsQuery.sender(), msg.id()); dnsResponse.addRecord(DnsSection.QUESTION, question); for (int i = 0, count = msg.count(DnsSection.ANSWER); i < count; i++) { DnsRecord record = msg.recordAt(DnsSection.ANSWER, i); if (record.type() == DnsRecordType.A) { // just print the IP after query DnsRawRecord raw = (DnsRawRecord) record; DefaultDnsRawRecord queryAnswer = new DefaultDnsRawRecord( question.name(), DnsRecordType.A, 600, Unpooled.wrappedBuffer(ByteBufUtil.getBytes(raw.content()))); dnsResponse.addRecord(DnsSection.ANSWER, queryAnswer); } } serverChannel.writeAndFlush(dnsResponse); } @Override public void exceptionCaught(ChannelHandlerContext ctx, Throwable e) { log.error(e.getMessage(), e); } }); } }); proxyChannel = b.bind(0).sync().addListener(future1 -> { log.info("绑定成功"); }).channel(); } public void send(String domain, int id, Channel serverChannel) { this.serverChannel = serverChannel; DnsQuery query = new DatagramDnsQuery(null, new InetSocketAddress("114.114.114.114", 53), id).setRecord( DnsSection.QUESTION, new DefaultDnsQuestion(domain, DnsRecordType.A)); this.proxyChannel.writeAndFlush(query); }}@Slf4jpublic final class DnsServer { private static final List<String> BLACK_LIST_DOMAIN = new ArrayList<>(); static { String s; try (InputStream is = DnsServer.class.getClassLoader().getResourceAsStream("black_list.txt"); BufferedReader br = new BufferedReader(new InputStreamReader(is))) { while (StrUtil.isNotBlank(s = br.readLine())) { BLACK_LIST_DOMAIN.add(s); } } catch (Exception e) { log.error(e.getMessage(), e); } } public static void main(String[] args) throws Exception { ProxyUdp proxyUdp = new ProxyUdp(); proxyUdp.init(); final int[] num = {0}; final NioEventLoopGroup group = new NioEventLoopGroup(); Bootstrap bootstrap = new Bootstrap(); bootstrap.group(group).channel(NioDatagramChannel.class) .handler(new ChannelInitializer<NioDatagramChannel>() { @Override protected void initChannel(NioDatagramChannel nioDatagramChannel) { nioDatagramChannel.pipeline().addLast(new DatagramDnsQueryDecoder()); nioDatagramChannel.pipeline().addLast(new SimpleChannelInboundHandler<DatagramDnsQuery>() { @Override protected void channelRead0(ChannelHandlerContext ctx, DatagramDnsQuery msg) { try { DefaultDnsQuestion dnsQuestion = msg.recordAt(DnsSection.QUESTION); String name = dnsQuestion.name(); log.info(name + ++num[0]); Channel channel = ctx.channel(); int id = msg.id(); channel.attr(AttributeKey.<DatagramDnsQuery>valueOf(String.valueOf(id))).set(msg); if (BLACK_LIST_DOMAIN.contains(name)) { DnsQuestion question = msg.recordAt(DnsSection.QUESTION); DatagramDnsResponse dnsResponse = getDatagramDnsResponse(msg, id, question); channel.writeAndFlush(dnsResponse); return; } proxyUdp.send(name, msg.id(), channel); } catch (Exception e) { log.error(e.getMessage(), e); } } private DatagramDnsResponse getDatagramDnsResponse(DatagramDnsQuery msg, int id, DnsQuestion question) { DatagramDnsResponse dnsResponse = new DatagramDnsResponse(msg.recipient(), msg.sender(), id); dnsResponse.addRecord(DnsSection.QUESTION, question); // just print the IP after query DefaultDnsRawRecord queryAnswer = new DefaultDnsRawRecord( question.name(), DnsRecordType.A, 600, Unpooled.wrappedBuffer(new byte[]{(byte) 192, (byte) 168, 1, 1})); dnsResponse.addRecord(DnsSection.ANSWER, queryAnswer); return dnsResponse; } @Override public void exceptionCaught(ChannelHandlerContext ctx, Throwable e) { log.error(e.getMessage(), e); } }); nioDatagramChannel.pipeline().addLast(new DatagramDnsResponseEncoder()); } }).option(ChannelOption.SO_BROADCAST, true); int port = 553; ChannelFuture future = bootstrap.bind(port).addListener(future1 -> { log.info("server listening port:{}", port); }); future.channel().closeFuture().addListener(future1 -> { if (future.isSuccess()) { log.info(future.channel().toString()); } }); }}@Slf4jclass ProxyUdp { private Channel localChannel; private Channel proxyChannel; public void init() throws InterruptedException { EventLoopGroup proxyGroup = new NioEventLoopGroup(); Bootstrap b = new Bootstrap(); b.group(proxyGroup) .channel(NioDatagramChannel.class) .handler(new ChannelInitializer<DatagramChannel>() { @Override protected void initChannel(DatagramChannel ch) { ChannelPipeline p = ch.pipeline(); p.addLast(new DatagramDnsQueryEncoder()) .addLast(new DatagramDnsResponseDecoder()) .addLast(new SimpleChannelInboundHandler<DatagramDnsResponse>() { @Override public void channelActive(ChannelHandlerContext ctx) { log.info(ctx.channel().toString()); } @Override protected void channelRead0(ChannelHandlerContext ctx, DatagramDnsResponse msg) { DatagramDnsQuery dnsQuery = localChannel.attr(AttributeKey.<DatagramDnsQuery>valueOf(String.valueOf(msg.id()))).get(); DnsQuestion question = msg.recordAt(DnsSection.QUESTION); DatagramDnsResponse dnsResponse = new DatagramDnsResponse(dnsQuery.recipient(), dnsQuery.sender(), msg.id()); dnsResponse.addRecord(DnsSection.QUESTION, question); for (int i = 0, count = msg.count(DnsSection.ANSWER); i < count; i++) { DnsRecord record = msg.recordAt(DnsSection.ANSWER, i); if (record.type() == DnsRecordType.A) { // just print the IP after query DnsRawRecord raw = (DnsRawRecord) record; DefaultDnsRawRecord queryAnswer = new DefaultDnsRawRecord( question.name(), DnsRecordType.A, 600, Unpooled.wrappedBuffer(ByteBufUtil.getBytes(raw.content()))); dnsResponse.addRecord(DnsSection.ANSWER, queryAnswer); } } localChannel.writeAndFlush(dnsResponse); } @Override public void exceptionCaught(ChannelHandlerContext ctx, Throwable e) { log.error(e.getMessage(), e); } }); } }); proxyChannel = b.bind(0).sync().addListener(future1 -> { log.info("绑定成功"); }).channel(); } public void send(String domain, int id, Channel localChannel) { this.localChannel = localChannel; DnsQuery query = new DatagramDnsQuery(null, new InetSocketAddress("114.114.114.114", 53), id).setRecord( DnsSection.QUESTION, new DefaultDnsQuestion(domain, DnsRecordType.A)); this.proxyChannel.writeAndFlush(query); }}ipconfig/flushdns 关键词：代理,服务,教程
