public static unsafe SocketError SetMulticastOption(SafeCloseSocket handle, SocketOptionName optionName, MulticastOption optionValue)
{
Debug.Assert(optionName == SocketOptionName.AddMembership || optionName == SocketOptionName.DropMembership);
Interop.Sys.MulticastOption optName = optionName == SocketOptionName.AddMembership ?
Interop.Sys.MulticastOption.MULTICAST_ADD :
Interop.Sys.MulticastOption.MULTICAST_DROP;
var opt = new Interop.Sys.IPv4MulticastOption {
MulticastAddress = unchecked((uint)optionValue.Group.GetAddress()),
LocalAddress = unchecked((uint)optionValue.LocalAddress.GetAddress()),
InterfaceIndex = optionValue.InterfaceIndex
};
Interop.Error err = Interop.Sys.SetIPv4MulticastOption(handle.FileDescriptor, optName, &opt);
return err == Interop.Error.SUCCESS ? SocketError.Success : GetSocketErrorForErrorCode(err);
}
public static unsafe SocketError SetSockOpt(SafeCloseSocket handle, SocketOptionLevel optionLevel, SocketOptionName optionName, int optionValue)
{
Interop.Error err;
if (optionLevel == SocketOptionLevel.Socket)
{
if (optionName == SocketOptionName.ReceiveTimeout)
{
handle.ReceiveTimeout = optionValue == 0 ? -1 : optionValue;
err = Interop.Sys.SetReceiveTimeout(handle, optionValue);
return err == Interop.Error.SUCCESS ? SocketError.Success : GetSocketErrorForErrorCode(err);
}
else if (optionName == SocketOptionName.SendTimeout)
{
handle.SendTimeout = optionValue == 0 ? -1 : optionValue;
err = Interop.Sys.SetSendTimeout(handle, optionValue);
return err == Interop.Error.SUCCESS ? SocketError.Success : GetSocketErrorForErrorCode(err);
}
}
else if (optionLevel == SocketOptionLevel.IP)
{
if (optionName == SocketOptionName.MulticastInterface)
{
// if the value of the IP_MULTICAST_IF is an address in the 0.x.x.x block
// the value is interpreted as an interface index
int interfaceIndex = IPAddress.NetworkToHostOrder(optionValue);
if ((interfaceIndex & 0xff000000) == 0)
{
var opt = new Interop.Sys.IPv4MulticastOption {
MulticastAddress = 0,
LocalAddress = 0,
InterfaceIndex = interfaceIndex
};
err = Interop.Sys.SetIPv4MulticastOption(handle, Interop.Sys.MulticastOption.MULTICAST_IF, &opt);
return err == Interop.Error.SUCCESS ? SocketError.Success : GetSocketErrorForErrorCode(err);
}
}
}
err = Interop.Sys.SetSockOpt(handle, optionLevel, optionName, (byte*)&optionValue, sizeof(int));
return err == Interop.Error.SUCCESS ? SocketError.Success : GetSocketErrorForErrorCode(err);
}
