internet: add win32-internet.h internet header wrapper

Undefines colliding symbols defined in winsock2.h.

src/internet/CMakeLists.txt

@@ -253,6 +253,13 @@ set(header_files
     model/windowed-filter.h
 )
 
+set(private_header_files)
+if(WIN32)
+  set(private_header_files
+      model/win32-internet.h
+  )
+endif()
+
 set(test_sources
     test/global-route-manager-impl-test-suite.cc
     test/icmp-test.cc
@@ -333,6 +340,7 @@ build_lib(
   LIBNAME internet
   SOURCE_FILES ${source_files}
   HEADER_FILES ${header_files}
+  PRIVATE_HEADER_FILES ${private_header_files}
   LIBRARIES_TO_LINK
     ${libnetwork}
     ${libcore}

src/internet/model/win32-internet.h

@@ -0,0 +1,20 @@
+/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
+
+#ifndef WIN32_INTERNET_H
+#define WIN32_INTERNET_H
+
+/* Winsock2.h is a cursed header that
+ * causes multiple name collisions
+ *
+ * We use this private header to prevent them
+ */
+
+#include <winsock2.h>
+#undef GetObject
+#undef SetPort
+#undef SendMessage
+#undef CreateFile
+#undef Rectangle
+#undef interface
+
+#endif // WIN32_INTERNET_H