public static DnsResponse Lookup(DnsRequest request, IPAddress dnsServer = null)
{
if (request == null)
{
throw new ArgumentNullException("request");
}
if (dnsServer == null)
{
dnsServer = GetDnsServer();
}
IPEndPoint server = new IPEndPoint(dnsServer, _dnsPort);
byte[] requestMessage = request.GetMessage();
byte[] responseMessage = UdpTransfer(server, requestMessage);
return(new DnsResponse(responseMessage));
}
public static MXRecord[] MXLookup(string domain, IPAddress dnsServer = null)
{
if (domain == null)
{
throw new ArgumentNullException("domain");
}
DnsRequest request = new DnsRequest();
request.AddQuestion(new DnsQuestion(domain, DnsType.MX, DnsClass.IN));
DnsResponse response = Lookup(request, dnsServer);
if (response == null)
{
return(null);
}
return(response.Answers
.Where(a => a.Record is MXRecord)
.Select(a => a.Record as MXRecord)
.ToArray());
}