public static async Task <DnsServer> Create(string ip, int port, IRecordResolver recordResolver, IAuthority areWeAuthority, IExceptionHandler onError)
{
var networkInterface = Network.Interfaces.FirstOrDefault(x => x.IpAddress == ip);
var udpReceiver = new UdpSocketReceiver();
var observerUdpReceiver = await udpReceiver.ObservableUnicastListener(
port : port,
communicationInterface : networkInterface,
allowMultipleBindToSamePort : false);
var subscriberUpdReceiver = observerUdpReceiver.Subscribe(
async udpMsg =>
{
var req = Reader.ReadRequest(new MemoryStream(udpMsg.ByteData));
var response = new Response(req);
foreach (var q in req)
{
var record = recordResolver.Resolve(q.Class, q.Type, q.Name);
if (record == null)
{
continue;
}
if (areWeAuthority?.AreWeAuthority(q.Name) ?? false)
{
response.Authorities.Add(record);
}
else
{
response.Answers.Add(record);
}
}
await udpReceiver.SendToAsync(Writer.Serialize(response), udpMsg.RemoteAddress, int.Parse(udpMsg.RemotePort));
},
x => onError?.OnError(x));
return(new UDPServer
{
udpReceiver = udpReceiver,
observerUdpReceiver = observerUdpReceiver,
subscriberUpdReceiver = subscriberUpdReceiver,
RecordResolver = recordResolver
});
}