public static ReadOnlyCollection <IPAddress> SortAddresses(Socket socket, IPAddress listenAddress, ReadOnlyCollection <IPAddress> addresses)
{
ReadOnlyCollection <IPAddress> sortedAddresses = null;
// Skip sort if ipv6 isn't installed or if address array has a single address
if (socket == null || addresses.Count <= 1)
{
sortedAddresses = addresses;
}
else
{
CriticalAllocHandleSocketAddressList inputBuffer = null;
CriticalAllocHandleSocketAddressList outputBuffer = null;
try
{
inputBuffer = CriticalAllocHandleSocketAddressList.FromAddressList(addresses);
outputBuffer = CriticalAllocHandleSocketAddressList.FromAddressCount(0);
// Invoke ioctl to sort the addresses
int realOutputBufferSize;
int error = UnsafeNativeMethods.ERROR_SUCCESS;
int errorCode = PeerWinsock.WSAIoctl(socket.Handle,
unchecked ((int)IOControlCode.AddressListSort),
(IntPtr)inputBuffer,
inputBuffer.Size,
(IntPtr)outputBuffer,
outputBuffer.Size,
out realOutputBufferSize,
IntPtr.Zero,
IntPtr.Zero);
if (errorCode == -1)
{
// Get the Win32 error code before doing anything else
error = Marshal.GetLastWin32Error();
throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new SocketException(error));
}
// Marshal the sorted SOCKET_ADDRESS_LIST into IPAddresses
sortedAddresses = outputBuffer.ToAddresses();
}
finally
{
if (inputBuffer != null)
{
inputBuffer.Dispose();
}
if (outputBuffer != null)
{
outputBuffer.Dispose();
}
}
}
return(sortedAddresses);
}
public static ReadOnlyCollection <IPAddress> SortAddresses(Socket socket, IPAddress listenAddress, ReadOnlyCollection <IPAddress> addresses)
{
ReadOnlyCollection <IPAddress> onlys = null;
if ((socket == null) || (addresses.Count <= 1))
{
return(addresses);
}
CriticalAllocHandleSocketAddressList list = null;
CriticalAllocHandleSocketAddressList list2 = null;
try
{
int num;
list = CriticalAllocHandleSocketAddressList.FromAddressList(addresses);
list2 = CriticalAllocHandleSocketAddressList.FromAddressCount(0);
int errorCode = 0;
if (PeerWinsock.WSAIoctl(socket.Handle, -939524071, (IntPtr)list, list.Size, (IntPtr)list2, list2.Size, out num, IntPtr.Zero, IntPtr.Zero) == -1)
{
errorCode = Marshal.GetLastWin32Error();
throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new SocketException(errorCode));
}
onlys = list2.ToAddresses();
}
finally
{
if (list != null)
{
list.Dispose();
}
if (list2 != null)
{
list2.Dispose();
}
}
return(onlys);
}