private void SetMulticastOption(SocketOptionName optionName, MulticastOption mr)
{
IPMulticastRequest mreq = new IPMulticastRequest();
mreq.MulticastAddress = GetIP4Address(mr.Group);
if (mr.LocalAddress != null)
{
mreq.InterfaceAddress = GetIP4Address(mr.LocalAddress);
}
else
{
int num = IPAddress.HostToNetworkOrder(mr.InterfaceIndex);
mreq.InterfaceAddress = num;
}
if (UnsafeMethods.setsockopt(Handle, SocketOptionLevel.IPv6, optionName, ref mreq, IPv6MulticastRequest.Size) ==
SocketError.SocketError)
{
throw new SocketException();
}
}
public static extern SocketError getsockopt([In] IntPtr socketHandle, [In] SocketOptionLevel optionLevel, [In] SocketOptionName optionName, out IPMulticastRequest optionValue, [In, Out] ref int optionLength);
public static extern SocketError setsockopt([In] IntPtr socketHandle, [In] SocketOptionLevel optionLevel, [In] SocketOptionName optionName, [In] ref IPMulticastRequest mreq, [In] int optionLength);
public static extern SocketError getsockopt([In] IntPtr socketHandle, [In] SocketOptionLevel optionLevel, [In] SocketOptionName optionName, out IPMulticastRequest optionValue, [In, Out] ref int optionLength);