DNS解析代码copy

临时备忘

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using ARSoft.Tools.Net.Dns;
using System.Net;
using System.Diagnostics;
namespace UseT
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            Trace.TraceError("xxx");
            var dnsServerIp = IPAddress.Parse("192.168.1.30");
            DnsClient dsnClient = new DnsClient(dnsServerIp, 3000);
            Stopwatch sw = new Stopwatch();
            sw.Start();
            Console.WriteLine("--------响应----------");
            var r = dsnClient.Resolve(textBox1.Text);
            if (r != null)
            {
                foreach (var it in r.AnswerRecords)
                {
                    var ar = it as ARecord;
                    if (ar != null)
                        Console.WriteLine(ar.Address.ToString());
                }
            }
            sw.Stop();
            Console.WriteLine(sw.ElapsedMilliseconds);

          
        }

        private DnsServer Server { get; set; }
        private void button2_Click(object sender, EventArgs e)
        {
            DnsServer dnsServer = new DnsServer(10,10,ProcessQuery);
            Server = dnsServer;
            dnsServer.Start();
        }

        private void button3_Click(object sender, EventArgs e)
        {
            if (Server != null) Server.Stop();
        }
        private static Lazy<DnsClient> LazyClient = new Lazy<DnsClient>(()=>DnsClient.Default, true);

        private static DnsMessageBase ProcessQuery(DnsMessageBase message, IPAddress clientAddress, System.Net.Sockets.ProtocolType protocol)
        {
            
            message.IsQuery = false;
            DnsMessage query = message as DnsMessage;

            // 官方的样例文档中没有体现DNS请求发起者的IP，我在这里增加了。
            Console.WriteLine("Client Address:{0}", clientAddress.ToString());
            Console.WriteLine("query.Questions.Count:{0}", query.Questions.Count);
            Console.WriteLine("query.Questions.ToString():{0}", query.Questions.ToString());
            Console.WriteLine("query.Questions[0].ToString():{0}", query.Questions[0].ToString());
            Console.WriteLine("query.Questions[0].GetType():{0}", query.Questions[0].GetType().ToString());
            Console.WriteLine("query.Questions[0].Name:{0}", query.Questions[0].Name.ToString());
            Console.WriteLine("query.Questions[0].RecordType:{0}", query.Questions[0].RecordType.ToString());
            Console.WriteLine("query.Questions[0].RecordClass {0}", query.Questions[0].RecordClass.ToString());

            //加入自己的解析
            if (query.Questions[0].Name.Contains("xxx"))
            {

                query.AnswerRecords.Add(new ARecord("", 3600, IPAddress.Parse("192.168.1.94")));
                message.ReturnCode = ReturnCode.NoError;
                return message;

            }
            else
            {

                var r= LazyClient.Value.Resolve(query.Questions[0].Name);
                if (r != null)
                {
                    foreach (var it in r.AnswerRecords)
                    {
                        var ar = it as ARecord;
                        if (ar != null)
                        {
                            query.AnswerRecords.Add(ar);
                        }
                           
                    }
                    message.ReturnCode = ReturnCode.NoError;
                }
                return message;

            }
        }

    }
}