dns-interceptor.csproj

<Project Sdk="Microsoft.NET.Sdk">

  <PropertyGroup>
    <OutputType>Exe</OutputType>
    <TargetFramework>netcoreapp2.2</TargetFramework>
    <RootNamespace>dns_interceptor</RootNamespace>
  </PropertyGroup>

  <ItemGroup>
    <PackageReference Include="DNS" Version="5.0.0" />
  </ItemGroup>

</Project>

dns_server.cs

using System;
using System.Threading.Tasks;
using DNS.Server;
using DNS.Client;

namespace Examples.Server
{
    class ServerExample
    {
        public static void Main(string[] args)
        {
            MainAsync(args).Wait();
        }

        public async static Task MainAsync(string[] args)
        {
            MasterFile masterFile = new MasterFile();
            DnsServer server = new DnsServer(masterFile, "8.8.8.8");

            // foreach (string domain in args)
            // {
            //     Console.WriteLine("Redirecting {0} to localhost", domain);
            //     masterFile.AddIPAddressResourceRecord(domain, "127.0.0.1");
            // }

            Console.WriteLine("Redirecting {0} to localhost", "**");
            masterFile.AddIPAddressResourceRecord("*.*", "127.0.0.1");

            server.Responded += (sender, e) => Console.WriteLine("{0} => {1}", e.Request, e.Response);
            server.Listening += (sender, e) => Console.WriteLine("Listening");
            server.Errored += (sender, e) =>
            {
                Console.WriteLine("Errored: {0}", e.Exception);
                ResponseException responseError = e.Exception as ResponseException;
                if (responseError != null) Console.WriteLine(responseError.Response);
            };

            await server.Listen();
        }
    }
}