private static void mdnsListener()
{
IPEndPoint localEp = new IPEndPoint(IPAddress.Any, mdnsPort);
Socket sock = new Socket(localEp.Address.AddressFamily, SocketType.Dgram, ProtocolType.Udp);
MulticastOption mcastGrp = new MulticastOption(IPAddress.Parse(mdnsIP));
IPEndPoint remoteIpEp = new IPEndPoint(IPAddress.Any, 0);
EndPoint remoteEp = (EndPoint)remoteIpEp;
Byte[] data = new Byte[65536];
sock.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.ReuseAddress, true);
sock.Bind(localEp);
sock.SetSocketOption(SocketOptionLevel.IP, SocketOptionName.AddMembership, mcastGrp);
//SendQuery(sock, "_services._iscsi-live._udp.local.");
AnnounceService(sock, "iscsi-live._192_168_2_84._tcp.local.");
Console.WriteLine("Listener Started");
while (serviceUp)
{
var rc = sock.ReceiveFrom(data, ref remoteEp);
Console.WriteLine("\nFrom: '" + remoteEp.ToString() + "' len: " + rc);
mDNSPacket mdnsPkt = new mDNSPacket(data);
}
Console.WriteLine("Listener Exiting");
}
private static void SendQuery(Socket sock, String service)
{
IPEndPoint remoteEp = new IPEndPoint(IPAddress.Parse(mdnsIP), mdnsPort);
mDNSPacket dnsPkt = new mDNSPacket();
mDNSHeader mdnsHdr = new mDNSHeader();
mDNSQuestion mdnsQ = new mDNSQuestion(service, QType.ANY, QClass.IN);
mdnsHdr.AA = false;
mdnsHdr.TC = false;
mdnsHdr.RD = false;
mdnsHdr.RA = false;
mdnsHdr.RCODE = RespCode.NoError;
mdnsHdr.OPCODE = OpCode.QUERY;
mdnsHdr.QR = false;
mdnsHdr.qdcount = 1;
mdnsHdr.an_rrs = 0;
mdnsHdr.ns_rrs = 0;
mdnsHdr.ar_rrs = 0;
dnsPkt.Header = mdnsHdr;
dnsPkt.Question = mdnsQ;
dnsPkt.print();
Console.WriteLine("Sending Query: " + service);
sock.SendTo(dnsPkt.data, remoteEp);
}
private static void AnnounceService(Socket sock, String service)
{
IPEndPoint remoteEp = new IPEndPoint(IPAddress.Parse(mdnsIP), mdnsPort);
mDNSPacket dnsPkt = new mDNSPacket();
mDNSHeader mdnsHdr = new mDNSHeader();
mDNSAnswerRR mdnsAnRR = new mDNSAnswerRR(service, Type.AAAA, (Class.IN | Class.CF), 4500, 16);
Byte[] rdata = new Byte[16];
mdnsAnRR.RDATA = rdata;
mdnsHdr.AA = true;
mdnsHdr.TC = false;
mdnsHdr.RD = false;
mdnsHdr.RA = false;
mdnsHdr.RCODE = RespCode.NoError;
mdnsHdr.OPCODE = OpCode.QUERY;
mdnsHdr.QR = true;
mdnsHdr.qdcount = 0;
mdnsHdr.an_rrs = 1;
mdnsHdr.ns_rrs = 0;
mdnsHdr.ar_rrs = 0;
dnsPkt.Header = mdnsHdr;
dnsPkt.AnswerRR = mdnsAnRR;
dnsPkt.print();
Console.WriteLine("Announcing Service: " + service);
sock.SendTo(dnsPkt.data, remoteEp);
}
static void PrintTestPacket()
{
mDNSPacket dnsPkt = new mDNSPacket();
mDNSHeader mdnsHdr = new mDNSHeader();
mDNSAnswerRR mdnsAnRR = new mDNSAnswerRR("_services._dns-sd._udp.local.", Type.TXT, Class.IN, 4500, 16);
mDNSAdditionalRR mdnsArRR = new mDNSAdditionalRR("_services._dns-sd._udp.local.", Type.TXT, Class.IN, 4500, 16);
Byte[] rdata = new Byte[16];
mdnsAnRR.RDATA = rdata;
mdnsArRR.RDATA = rdata;
mdnsHdr.AA = true;
mdnsHdr.TC = false;
mdnsHdr.RD = false;
mdnsHdr.RA = false;
mdnsHdr.RCODE = RespCode.NoError;
mdnsHdr.QR = true;
mdnsHdr.qdcount = 0;
mdnsHdr.an_rrs = 3;
mdnsHdr.ns_rrs = 0;
mdnsHdr.ar_rrs = 4;
dnsPkt.Header = mdnsHdr;
dnsPkt.AnswerRR = mdnsAnRR;
dnsPkt.AnswerRR = mdnsAnRR;
dnsPkt.AnswerRR = mdnsAnRR;
dnsPkt.AdditionalRR = mdnsArRR;
dnsPkt.AdditionalRR = mdnsArRR;
dnsPkt.AdditionalRR = mdnsArRR;
dnsPkt.AdditionalRR = mdnsArRR;
dnsPkt.print();
}
