kernel-wfp: Fix/Complete some fwpuclnt functionality in MinGW

While MinGW declares all the required symbols, some of them are missing in the
library files. We provide missing variables locally, functions get a stub
that call the GetProcAddress()ed function from the DLL.

Also some MinGW headers define some enum values incorrectly, we overload these
using defines.

src/libcharon/plugins/kernel_wfp/Makefile.am

@@ -14,6 +14,7 @@ endif
 
 libstrongswan_kernel_wfp_la_SOURCES = \
 	kernel_wfp_plugin.h kernel_wfp_plugin.c \
+	kernel_wfp_compat.c kernel_wfp_compat.h \
 	kernel_wfp_ipsec.h kernel_wfp_ipsec.c
 
 libstrongswan_kernel_wfp_la_LDFLAGS = -module -avoid-version

src/libcharon/plugins/kernel_wfp/kernel_wfp_compat.c

@@ -0,0 +1,83 @@
+/*
+ * Copyright (C) 2013 Martin Willi
+ * Copyright (C) 2013 revosec AG
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.  See <http://www.fsf.org/copyleft/gpl.txt>.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * for more details.
+ */
+
+#include <library.h>
+
+const GUID FWPM_CONDITION_IP_REMOTE_ADDRESS = {
+	0xb235ae9a, 0x1d64, 0x49b8, { 0xa4,0x4c,0x5f,0xf3,0xd9,0x09,0x50,0x45 }
+};
+const GUID FWPM_CONDITION_IP_LOCAL_ADDRESS = {
+	0xd9ee00de, 0xc1ef, 0x4617, { 0xbf,0xe3,0xff,0xd8,0xf5,0xa0,0x89,0x57 }
+};
+const GUID FWPM_LAYER_INBOUND_TRANSPORT_V4 = {
+	0x5926dfc8, 0xe3cf, 0x4426, { 0xa2,0x83,0xdc,0x39,0x3f,0x5d,0x0f,0x9d }
+};
+const GUID FWPM_LAYER_OUTBOUND_TRANSPORT_V4 = {
+	0x09e61aea, 0xd214, 0x46e2, { 0x9b,0x21,0xb2,0x6b,0x0b,0x2f,0x28,0xc8 }
+};
+const GUID FWPM_CALLOUT_IPSEC_INBOUND_TRANSPORT_V4 = {
+	0x5132900d, 0x5e84, 0x4b5f, { 0x80,0xe4,0x01,0x74,0x1e,0x81,0xff,0x10 }
+};
+const GUID FWPM_CALLOUT_IPSEC_OUTBOUND_TRANSPORT_V4 = {
+	0x4b46bf0a, 0x4523, 0x4e57, { 0xaa,0x38,0xa8,0x79,0x87,0xc9,0x10,0xd9 }
+};
+
+/**
+ * Load a function symbol from a loaded dll
+ */
+static inline void *load_function(char *dll, char *name)
+{
+	HANDLE handle;
+	void *sym = NULL;
+
+	handle = GetModuleHandle(dll);
+	if (!handle)
+	{
+		return NULL;
+	}
+	sym = GetProcAddress(handle, name);
+	return sym;
+}
+
+/**
+ * Macro that defines a stub for a function that calls the same DLL function
+ *
+ * @param dll		DLL to find function in
+ * @param ret		return type of function
+ * @param name		function name
+ * @param size		size of all arguments on stack
+ * @param ...		arguments of function
+ */
+#define STUB(dll, ret, name, size, ...) \
+ret WINAPI name(__VA_ARGS__) \
+{ \
+	static void (*fun)() = NULL; \
+	if (!fun) \
+	{ \
+		fun = load_function(#dll, #name); \
+	} \
+	if (fun) \
+	{ \
+		__builtin_return(__builtin_apply(fun, __builtin_apply_args(), size)); \
+	} \
+	return ERROR_NOT_SUPPORTED; \
+}
+
+STUB(fwpuclnt, DWORD, IPsecSaContextCreate1, 40,
+	HANDLE engineHandle, const void *outboundTraffic,
+	const void *virtualIfTunnelInfo, UINT64 *inboundFilterId, UINT64 *id)
+
+STUB(fwpuclnt, DWORD, IPsecSaContextSetSpi0, 32,
+	HANDLE engineHandle, UINT64 id, const void *getSpi, UINT32 inboundSpi)

src/libcharon/plugins/kernel_wfp/kernel_wfp_compat.h

@@ -0,0 +1,48 @@
+/*
+ * Copyright (C) 2013 Martin Willi
+ * Copyright (C) 2013 revosec AG
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.  See <http://www.fsf.org/copyleft/gpl.txt>.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * for more details.
+ */
+
+/**
+ * @defgroup kernel_wfp_compat kernel_wfp_compat
+ * @{ @ingroup kernel_wfp
+ */
+
+#ifndef KERNEL_WFP_COMPAT_H_
+#define KERNEL_WFP_COMPAT_H_
+
+#include <winsock2.h>
+#include <windows.h>
+#include <ipsectypes.h>
+
+/* MinGW defines CIPHERs incorrectly starting at 0 */
+#define IPSEC_CIPHER_TYPE_DES					1
+#define IPSEC_CIPHER_TYPE_3DES					2
+#define IPSEC_CIPHER_TYPE_AES_128				3
+#define IPSEC_CIPHER_TYPE_AES_192				4
+#define IPSEC_CIPHER_TYPE_AES_256				5
+#define IPSEC_CIPHER_TYPE_MAX					6
+
+#include <fwpmtypes.h>
+#include <fwpmu.h>
+#undef interface
+
+/* MinGW defines TRANSFORMs incorrectly starting at 0 */
+#define IPSEC_TRANSFORM_AH						1
+#define IPSEC_TRANSFORM_ESP_AUTH				2
+#define IPSEC_TRANSFORM_ESP_CIPHER				3
+#define IPSEC_TRANSFORM_ESP_AUTH_AND_CIPHER		4
+#define IPSEC_TRANSFORM_ESP_AUTH_FW				5
+#define IPSEC_TRANSFORM_TYPE_MAX				6
+
+#endif /** KERNEL_WFP_COMPAT_H_ @}*/

src/libcharon/plugins/kernel_wfp/kernel_wfp_ipsec.c

@@ -16,6 +16,7 @@
 /* Windows 7, for some fwpmu.h functionality */
 #define _WIN32_WINNT 0x0601
 
+#include "kernel_wfp_compat.h"
 #include "kernel_wfp_ipsec.h"
 
 #include <daemon.h>
@@ -23,9 +24,6 @@
 #include <collections/array.h>
 #include <collections/hashtable.h>
 
-#include <fwpmtypes.h>
-#include <fwpmu.h>
-#undef interface
 
 typedef struct private_kernel_wfp_ipsec_t private_kernel_wfp_ipsec_t;