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diff --git a/src/VBox/NetworkServices/NAT/winutils.h b/src/VBox/NetworkServices/NAT/winutils.h
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+/* $Id: winutils.h $ */
+/** @file
+ * NAT Network - winsock compatibility shim.
+ */
+
+/*
+ * Copyright (C) 2013-2019 Oracle Corporation
+ *
+ * This file is part of VirtualBox Open Source Edition (OSE), as
+ * available from http://www.virtualbox.org. This file is free software;
+ * you can redistribute it and/or modify it under the terms of the GNU
+ * General Public License (GPL) as published by the Free Software
+ * Foundation, in version 2 as it comes in the "COPYING" file of the
+ * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
+ * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
+ */
+
+#ifndef VBOX_INCLUDED_SRC_NAT_winutils_h
+#define VBOX_INCLUDED_SRC_NAT_winutils_h
+#ifndef RT_WITHOUT_PRAGMA_ONCE
+# pragma once
+#endif
+
+# include <iprt/cdefs.h>
+
+# ifdef RT_OS_WINDOWS
+# include <iprt/win/winsock2.h>
+# include <iprt/win/ws2tcpip.h>
+# include <mswsock.h>
+# include <iprt/win/windows.h>
+# include <iprt/err.h>
+# include <iprt/net.h>
+# include <iprt/log.h>
+/**
+ * Inclusion of lwip/def.h was added here to avoid conflict of definitions
+ * of hton-family functions in LWIP and windock's headers.
+ */
+# include <lwip/def.h>
+
+# ifndef PF_LOCAL
+# define PF_LOCAL AF_INET
+# endif
+
+# ifdef DEBUG
+# define err(code,...) do { \
+ AssertMsgFailed((__VA_ARGS__)); \
+ }while(0)
+#else
+# define err(code,...) do { \
+ DPRINTF0((__VA_ARGS__)); \
+ ExitProcess(code); \
+ }while(0)
+#endif
+# define errx err
+# define __func__ __FUNCTION__
+# define __attribute__(x) /* IGNORE */
+
+# define SOCKERRNO() (WSAGetLastError())
+# define SET_SOCKERRNO(error) do { WSASetLastError(error); } while (0)
+
+/**
+ * "Windows Sockets Error Codes" obtained with WSAGetLastError().
+ * http://msdn.microsoft.com/en-us/library/windows/desktop/ms740668(v=vs.85).aspx
+ *
+ * This block of error codes from <winsock2.h> conflicts with "POSIX
+ * supplement" error codes from <errno.h>, but we don't expect to ever
+ * encounter the latter in the proxy code, so redefine them to their
+ * unixy names.
+ */
+# undef EWOULDBLOCK
+# define EWOULDBLOCK WSAEWOULDBLOCK
+# undef EINPROGRESS
+# define EINPROGRESS WSAEINPROGRESS
+# undef EALREADY
+# define EALREADY WSAEALREADY
+# undef ENOTSOCK
+# define ENOTSOCK WSAENOTSOCK
+# undef EDESTADDRREQ
+# define EDESTADDRREQ WSAEDESTADDRREQ
+# undef EMSGSIZE
+# define EMSGSIZE WSAEMSGSIZE
+# undef EPROTOTYPE
+# define EPROTOTYPE WSAEPROTOTYPE
+# undef ENOPROTOOPT
+# define ENOPROTOOPT WSAENOPROTOOPT
+# undef EPROTONOSUPPORT
+# define EPROTONOSUPPORT WSAEPROTONOSUPPORT
+# undef ESOCKTNOSUPPORT
+# define ESOCKTNOSUPPORT WSAESOCKTNOSUPPORT
+# undef EOPNOTSUPP
+# define EOPNOTSUPP WSAEOPNOTSUPP
+# undef EPFNOSUPPORT
+# define EPFNOSUPPORT WSAEPFNOSUPPORT
+# undef EAFNOSUPPORT
+# define EAFNOSUPPORT WSAEAFNOSUPPORT
+# undef EADDRINUSE
+# define EADDRINUSE WSAEADDRINUSE
+# undef EADDRNOTAVAIL
+# define EADDRNOTAVAIL WSAEADDRNOTAVAIL
+# undef ENETDOWN
+# define ENETDOWN WSAENETDOWN
+# undef ENETUNREACH
+# define ENETUNREACH WSAENETUNREACH
+# undef ENETRESET
+# define ENETRESET WSAENETRESET
+# undef ECONNABORTED
+# define ECONNABORTED WSAECONNABORTED
+# undef ECONNRESET
+# define ECONNRESET WSAECONNRESET
+# undef ENOBUFS
+# define ENOBUFS WSAENOBUFS
+# undef EISCONN
+# define EISCONN WSAEISCONN
+# undef ENOTCONN
+# define ENOTCONN WSAENOTCONN
+# undef ESHUTDOWN
+# define ESHUTDOWN WSAESHUTDOWN
+# undef ETOOMANYREFS
+# define ETOOMANYREFS WSAETOOMANYREFS
+# undef ETIMEDOUT
+# define ETIMEDOUT WSAETIMEDOUT
+# undef ECONNREFUSED
+# define ECONNREFUSED WSAECONNREFUSED
+# undef ELOOP
+# define ELOOP WSAELOOP
+# undef ENAMETOOLONG
+# define ENAMETOOLONG WSAENAMETOOLONG
+# undef EHOSTDOWN
+# define EHOSTDOWN WSAEHOSTDOWN
+# undef EHOSTUNREACH
+# define EHOSTUNREACH WSAEHOSTUNREACH
+
+/**
+ * parameters to shutdown (2) with Winsock2
+ * http://msdn.microsoft.com/en-us/library/windows/desktop/ms740481(v=vs.85).aspx
+ */
+# define SHUT_RD SD_RECEIVE
+# define SHUT_WR SD_SEND
+# define SHUT_RDWR SD_BOTH
+
+typedef ULONG nfds_t;
+
+typedef WSABUF IOVEC;
+
+# define IOVEC_GET_BASE(iov) ((iov).buf)
+# define IOVEC_SET_BASE(iov, b) ((iov).buf = (b))
+
+# define IOVEC_GET_LEN(iov) ((iov).len)
+# define IOVEC_SET_LEN(iov, l) ((iov).len = (ULONG)(l))
+
+#if _WIN32_WINNT < 0x0600
+/* otherwise defined the other way around in ws2def.h */
+#define cmsghdr _WSACMSGHDR
+
+#undef CMSG_DATA /* wincrypt.h can byte my shiny metal #undef */
+#define CMSG_DATA WSA_CMSG_DATA
+#define CMSG_LEN WSA_CMSG_LEN
+#define CMSG_SPACE WSA_CMSG_SPACE
+
+#define CMSG_FIRSTHDR WSA_CMSG_FIRSTHDR
+#define CMSG_NXTHDR WSA_CMSG_NXTHDR
+#endif /* _WIN32_WINNT < 0x0600 - provide unglified CMSG names */
+
+RT_C_DECLS_BEGIN
+int RTWinSocketPair(int domain, int type, int protocol, SOCKET socket_vector[2]);
+RT_C_DECLS_END
+
+# else /* !RT_OS_WINDOWS */
+
+# include <errno.h>
+# include <unistd.h>
+
+# define SOCKET int
+# define INVALID_SOCKET (-1)
+# define SOCKET_ERROR (-1)
+
+# define SOCKERRNO() (errno)
+# define SET_SOCKERRNO(error) do { errno = (error); } while (0)
+
+# define closesocket(s) close(s)
+# define ioctlsocket(s, req, arg) ioctl((s), (req), (arg))
+
+typedef struct iovec IOVEC;
+
+# define IOVEC_GET_BASE(iov) ((iov).iov_base)
+# define IOVEC_SET_BASE(iov, b) ((iov).iov_base = (b))
+
+# define IOVEC_GET_LEN(iov) ((iov).iov_len)
+# define IOVEC_SET_LEN(iov, l) ((iov).iov_len = (l))
+# endif
+
+DECLINLINE(int)
+proxy_error_is_transient(int error)
+{
+# if !defined(RT_OS_WINDOWS)
+ return error == EWOULDBLOCK
+# if EAGAIN != EWOULDBLOCK
+ || error == EAGAIN
+# endif
+ || error == EINTR
+ || error == ENOBUFS
+ || error == ENOMEM;
+# else
+ return error == WSAEWOULDBLOCK
+ || error == WSAEINTR /* NB: we don't redefine EINTR above */
+ || error == WSAENOBUFS;
+# endif
+}
+
+#endif /* !VBOX_INCLUDED_SRC_NAT_winutils_h */