Add libbox wrapper

experimental/libbox/platform.go

@@ -0,0 +1,16 @@
+package libbox
+
+type PlatformInterface interface {
+	AutoDetectInterfaceControl(fd int32) error
+	OpenTun(options TunOptions) (TunInterface, error)
+	WriteLog(message string)
+	UseProcFS() bool
+	FindConnectionOwner(ipProtocol int32, sourceAddress string, sourcePort int32, destinationAddress string, destinationPort int32) (int32, error)
+	PackageNameByUid(uid int32) (string, error)
+	UIDByPackageName(packageName string) (int32, error)
+}
+
+type TunInterface interface {
+	FileDescriptor() int32
+	Close() error
+}