internal IPAddress MarshalIPAddress()
{
// Determine the address family used to create the IPAddress
AddressFamily family = (addressLength > SocketAddress.IPv4AddressSize)
? AddressFamily.InterNetworkV6 : AddressFamily.InterNetwork;
SocketAddress sockAddress = new SocketAddress(family, addressLength);
Marshal.Copy(address, sockAddress.m_Buffer, 0, addressLength);
return(sockAddress.GetIPAddress());
}
//
// SetUnmanagedStructures -
// Fills in Overlapped Structures used in an Async Overlapped Winsock call
// these calls are outside the runtime and are unmanaged code, so we need
// to prepare specific structures and ints that lie in unmanaged memory
// since the Overlapped calls can be Async
//
internal void SetUnmanagedStructures(byte[] buffer, int offset, int size, SocketAddress socketAddress, SocketFlags socketFlags)
{
m_MessageBuffer = new byte[s_WSAMsgSize];
m_WSABufferArray = new byte[s_WSABufferSize];
//ipv4 or ipv6?
IPAddress ipAddress = (socketAddress.Family == AddressFamily.InterNetworkV6
? socketAddress.GetIPAddress() : null);
bool ipv4 = (((Socket)AsyncObject).AddressFamily == AddressFamily.InterNetwork ||
(ipAddress != null && ipAddress.IsIPv4MappedToIPv6)); // DualMode
bool ipv6 = ((Socket)AsyncObject).AddressFamily == AddressFamily.InterNetworkV6;
//prepare control buffer
if (ipv4)
{
m_ControlBuffer = new byte[s_ControlDataSize];
}
else if (ipv6)
{
m_ControlBuffer = new byte[s_ControlDataIPv6Size];
}
//pin buffers
object[] objectsToPin = new object[(m_ControlBuffer != null)?5:4];
objectsToPin[0] = buffer;
objectsToPin[1] = m_MessageBuffer;
objectsToPin[2] = m_WSABufferArray;
//prepare socketaddress buffer
m_SocketAddress = socketAddress;
m_SocketAddress.CopyAddressSizeIntoBuffer();
objectsToPin[3] = m_SocketAddress.m_Buffer;
if (m_ControlBuffer != null)
{
objectsToPin[4] = m_ControlBuffer;
}
base.SetUnmanagedStructures(objectsToPin);
//prepare data buffer
m_WSABuffer = (WSABuffer *)Marshal.UnsafeAddrOfPinnedArrayElement(m_WSABufferArray, 0);
m_WSABuffer->Length = size;
m_WSABuffer->Pointer = Marshal.UnsafeAddrOfPinnedArrayElement(buffer, offset);
//setup structure
m_Message = (UnsafeNclNativeMethods.OSSOCK.WSAMsg *)Marshal.UnsafeAddrOfPinnedArrayElement(m_MessageBuffer, 0);
m_Message->socketAddress = Marshal.UnsafeAddrOfPinnedArrayElement(m_SocketAddress.m_Buffer, 0);
m_Message->addressLength = (uint)m_SocketAddress.Size;
m_Message->buffers = Marshal.UnsafeAddrOfPinnedArrayElement(m_WSABufferArray, 0);
m_Message->count = 1;
if (m_ControlBuffer != null)
{
m_Message->controlBuffer.Pointer = Marshal.UnsafeAddrOfPinnedArrayElement(m_ControlBuffer, 0);
m_Message->controlBuffer.Length = m_ControlBuffer.Length;
}
m_Message->flags = socketFlags;
}