public async Task <DnsMessage> ResolveTlsAsync(IPEndPoint serverEndpoint, string serverCN, DnsMessage message, CancellationToken stoppingToken)
{
using (var server = new TcpClient())
{
server.NoDelay = true;
await server.ConnectAsync(serverEndpoint.Address, serverEndpoint.Port);
using (SslStream serverStream = new SslStream(
server.GetStream(),
false,
new RemoteCertificateValidationCallback(new SslStreamHelper(_logger).ValidateServerCertificate)))
{
await serverStream.AuthenticateAsClientAsync(serverCN);
_logger.LogDebug($"Established {serverEndpoint}");
await SendTcpAsync(serverStream, message, stoppingToken);
return(await ReadTcpAsync(serverStream, stoppingToken));
}
}
}
public async Task SendTcpAsync(Stream stream, DnsMessage message, CancellationToken stoppingToken)
{
await stream.WriteAsync(message.Length, 0, message.Length.Length, stoppingToken);
await stream.WriteAsync(message.Data, 0, message.Data.Length, stoppingToken);
}