public static bool IsMulticast(this System.Net.IPAddress ipAddress)
{
if (ipAddress == null)
{
return(false);
}
byte[] addressBytes;
switch (ipAddress.AddressFamily)
{
case System.Net.Sockets.AddressFamily.InterNetwork:
{
#if UNSAFE
unsafe
{
//Read bits as a byte
byte prop = (byte)(long *)ipAddress.Address;
//Return the result of the evaluation
return(prop >= 224 && prop <= 239);
}
#elif NATIVE
byte highIP = System.Runtime.InteropServices.Marshal.ReadByte(ipAddress.Address, 0);
return(highIP >= 224 && highIP <= 239);
#else
byte highIP = (byte)(ipAddress.Address & byte.MaxValue); // ipAddress.GetAddressBytes()[0];
return(highIP >= 224 && highIP <= 239);
#endif
}
case System.Net.Sockets.AddressFamily.InterNetworkV6:
{
//Check for a ipv6 multicast address
if (ipAddress.IsIPv6Multicast)
{
return(true);
}
//could use out overload and check in place or pass out to MapToIpv4...
//Check if mapped to v6 from v4 and unmap
if (IPAddressExtensions.IsIPv4MappedToIPv6(ipAddress, out addressBytes)) //(ipAddress.IsIPv4MappedToIPv6)
{
ipAddress = IPAddressExtensions.MapToIPv4(addressBytes); //ipAddress.MapToIPv4();
//handle as v4
goto case System.Net.Sockets.AddressFamily.InterNetwork;
}
return(false);
}
default: return(false);
}
}
private void EndReceive(UDPSocket socket, byte[] buffer, int offset, int count, System.Net.EndPoint ep)
{
if (count > 0)
{
byte[] bytes = new byte[count];
Buffer.BlockCopy(buffer, 0, bytes, 0, count);
if (ep.AddressFamily == AddressFamily.InterNetworkV6)
{
IPEndPoint ipep = (IPEndPoint)ep;
if (IPAddressExtensions.IsIPv4MappedToIPv6(ipep.Address))
{
ipep.Address = IPAddressExtensions.MapToIPv4(ipep.Address);
}
}
FireDataReceived(bytes, ep);
}
BeginReceive(socket);
}