conf: introduce configuration management

1 files changed, 50 insertions, 0 deletions

diff --git a/conf/path_windows.go b/conf/path_windows.go
new file mode 100644
index 00000000..0ee3fc73
--- /dev/null
+++ b/conf/path_windows.go
@@ -0,0 +1,50 @@
+/* SPDX-License-Identifier: MIT
+ *
+ * Copyright (C) 2019 WireGuard LLC. All Rights Reserved.
+ */
+
+package conf
+
+import (
+	"errors"
+	"golang.org/x/sys/windows"
+	"os"
+	"path/filepath"
+	"unsafe"
+)
+
+//sys coTaskMemFree(pointer uintptr) = ole32.CoTaskMemFree
+//sys shGetKnownFolderPath(id *windows.GUID, flags uint32, token windows.Handle, path **uint16) (err error) [failretval!=0] = shell32.SHGetKnownFolderPath
+var folderIDLocalAppData = windows.GUID{0xf1b32785, 0x6fba, 0x4fcf, [8]byte{0x9d, 0x55, 0x7b, 0x8e, 0x7f, 0x15, 0x70, 0x91}}
+
+const kfFlagCreate = 0x00008000
+
+var cachedConfigFileDir string
+
+func resolveConfigFileDir() (string, error) {
+	if cachedConfigFileDir != "" {
+		return cachedConfigFileDir, nil
+	}
+	processToken, err := windows.OpenCurrentProcessToken()
+	if err != nil {
+		return "", err
+	}
+	defer processToken.Close()
+	var path *uint16
+	err = shGetKnownFolderPath(&folderIDLocalAppData, kfFlagCreate, windows.Handle(processToken), &path)
+	if err != nil {
+		return "", err
+	}
+	defer coTaskMemFree(uintptr(unsafe.Pointer(path)))
+	root := windows.UTF16ToString((*[windows.MAX_LONG_PATH + 1]uint16)(unsafe.Pointer(path))[:])
+	if len(root) == 0 {
+		return "", errors.New("Unable to determine configuration directory")
+	}
+	c := filepath.Join(root, "WireGuard", "Configurations")
+	err = os.MkdirAll(c, os.ModeDir|0700)
+	if err != nil {
+		return "", err
+	}
+	cachedConfigFileDir = c
+	return cachedConfigFileDir, nil
+}