public static RecordPTR Get(IPAddress target, IPAddress localAddress, byte attempts = 2, int timeout = 1000)
{
var packet = new LlmnrPacket();
packet.Questions = new[] {new DnsLlmnrQuestion {Type = DnsLlmnrCodes.QTypes.PTR, Name = target.GetAddrArpaString()}};
var responsePacket = packet.Send(Ipv4MulticastEndpoint, localAddress, attempts, timeout);
if (responsePacket.Header.RCode != DnsLlmnrCodes.RCodes.NoError)
throw new CfnException(responsePacket.Header.RCode.GetThrowMessage());
return responsePacket.Answers[0].Record as RecordPTR;
}
public static RecordPTR[] Get(IPAddress target, IPAddress dnsServer, IPAddress localAddress, int attempts = 2, int timeout = 1000)
{
if (dnsServer.AddressFamily != localAddress.AddressFamily)
throw new CfnIpFamilyMismatchException();
var requestPacket = new DnsPacket();
requestPacket.Header.RecursionDesired = true;
requestPacket.Questions = new[] {new DnsLlmnrQuestion {Name = target.GetAddrArpaString(), Type = DnsLlmnrCodes.QTypes.PTR}};
var responsePacket = requestPacket.Send(dnsServer, 53, localAddress, attempts, timeout);
if (responsePacket.Header.RCode != DnsLlmnrCodes.RCodes.NoError && responsePacket.Header.RCode != DnsLlmnrCodes.RCodes.NxDomain)
throw new CfnException(responsePacket.Header.RCode.GetThrowMessage());
return responsePacket.Answers.Where(x => x.Type == DnsLlmnrCodes.RrTypes.PTR).Select(x => ((RecordPTR) x.Record)).ToArray();
}
