public static unsafe SocketError GetIPv6MulticastOption(SafeCloseSocket handle, SocketOptionName optionName, out IPv6MulticastOption optionValue)
{
int optLevel, optName;
GetPlatformOptionInfo(SocketOptionLevel.IPv6, optionName, out optLevel, out optName);
var mreq = new Interop.libc.ipv6_mreq();
var optLen = (uint)sizeof(Interop.libc.ipv6_mreq);
int err = Interop.libc.getsockopt(handle.FileDescriptor, optLevel, optName, &mreq, &optLen);
if (err == -1)
{
optionValue = default(IPv6MulticastOption);
return GetLastSocketError();
}
var multicastAddress = new byte[sizeof(Interop.libc.in6_addr)];
for (int i = 0; i < multicastAddress.Length; i++)
{
multicastAddress[i] = mreq.ipv6mr_multiaddr.s6_addr[i];
}
optionValue = new IPv6MulticastOption(new IPAddress(multicastAddress), mreq.ipv6mr_ifindex);
return SocketError.Success;
}
public static unsafe SocketError SetIPv6MulticastOption(SafeCloseSocket handle, SocketOptionName optionName, IPv6MulticastOption optionValue)
{
int optLevel, optName;
GetPlatformOptionInfo(SocketOptionLevel.IPv6, optionName, out optLevel, out optName);
var mreq = new Interop.libc.ipv6_mreq {
// TODO: what is the endianness of ipv6mr_ifindex?
ipv6mr_ifindex = checked((int)optionValue.InterfaceIndex)
};
byte[] multicastAddress = optionValue.Group.GetAddressBytes();
Debug.Assert(multicastAddress.Length == sizeof(Interop.libc.in6_addr));
for (int i = 0; i < multicastAddress.Length; i++)
{
mreq.ipv6mr_multiaddr.s6_addr[i] = multicastAddress[i];
}
int err = Interop.libc.setsockopt(handle.FileDescriptor, optLevel, optName, &mreq, (uint)sizeof(Interop.libc.ipv6_mreq));
return err == -1 ? GetLastSocketError() : SocketError.Success;
}
