IPMeow/test/IPMeow.Test/DnsTest.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Net.Sockets;
using System.Threading.Tasks;
using IPMeow.Dns;

namespace IPMeow.Test;

public class DnsTest
{
    [Fact]
    public async Task TestDns()
    {
        using UdpClient udp = new UdpClient(AddressFamily.InterNetwork);
        udp.Connect(IPAddress.Parse("1.1.1.1"), 53);

        DnsMessage msg = new()
        {
            IsRecursionDesired = true,
            IsRecursionAvailable = true,
            MessageId = 0xbabe,
            MessageType = DnsMessageType.Query,
            Opcode = DnsMessageOpcode.Query,
            Questions = new List<QueryResourceRecord>()
            {
                new QueryResourceRecord()
                {
                    Class = ResourceRecordClass.IN,
                    Name = "meow.lgbt",
                    Type = ResourceRecordType.A
                },
            },
            ResponseCode = 0,
        };

        var data = msg.Serialize();
        await udp.SendAsync(data);

        var rec = await udp.ReceiveAsync();

        var res = DnsMessage.Deserialize(rec.Buffer);

        Assert.Equal(DnsMessageType.Reply, res.MessageType);
        Assert.Equal(0xbabe, res.MessageId);
    }
}