protected virtual bool SuperiorAcquired(DnsRequest request, Action<BufferSegment, DnsResponse> answer)
{
Socket dns = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);
try
{
dns.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.ReceiveTimeout, 1500);
foreach (IPEndPoint dnsServer in this.m_dnsServer)
{
dns.SendTo(request.Message.Buffer,
request.Message.Offset,
request.Message.Length, SocketFlags.None, dnsServer);
}
byte[] response_data = new byte[Layer3Netif.MTU];
EndPoint server = dns.LocalEndPoint;
dns.BeginReceiveFrom(response_data, 0,
response_data.Length, SocketFlags.None, ref server, (ar) =>
{
using (dns)
{
do
{
try
{
int response_length = dns.EndReceiveFrom(ar, ref server);
if (response_length <= 0)
{
break;
}
DnsResponse response = DnsResponse.From(response_data, response_length);
if (response == null)
{
break;
}
answer?.Invoke(new BufferSegment(response_data, 0, response_length), response);
}
catch (Exception) { }
} while (false);
dns.Close();
}
}, null);
return true;
}
catch (Exception)
{
dns.Close();
dns.Dispose();
return false;
}
}
