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- // Copyright (C) 2022 The Syncthing Authors.
- //
- // This Source Code Form is subject to the terms of the Mozilla Public
- // License, v. 2.0. If a copy of the MPL was not distributed with this file,
- // You can obtain one at https://mozilla.org/MPL/2.0/.
- package fs
- import (
- "fmt"
- "github.com/syncthing/syncthing/lib/protocol"
- "golang.org/x/sys/windows"
- )
- func (f *BasicFilesystem) PlatformData(name string, scanOwnership, _ bool, _ XattrFilter) (protocol.PlatformData, error) {
- if !scanOwnership {
- // That's the only thing we do, currently
- return protocol.PlatformData{}, nil
- }
- rootedName, err := f.rooted(name)
- if err != nil {
- return protocol.PlatformData{}, fmt.Errorf("rooted for %s: %w", name, err)
- }
- hdl, err := openReadOnlyWithBackupSemantics(rootedName)
- if err != nil {
- return protocol.PlatformData{}, fmt.Errorf("open %s: %w", rootedName, err)
- }
- defer windows.Close(hdl)
- // GetSecurityInfo returns an owner SID.
- sd, err := windows.GetSecurityInfo(hdl, windows.SE_FILE_OBJECT, windows.OWNER_SECURITY_INFORMATION)
- if err != nil {
- return protocol.PlatformData{}, fmt.Errorf("get security info for %s: %w", rootedName, err)
- }
- owner, _, err := sd.Owner()
- if err != nil {
- return protocol.PlatformData{}, fmt.Errorf("get owner for %s: %w", rootedName, err)
- }
- pd := &protocol.WindowsData{}
- if us := f.userCache.lookup(owner.String()); us != nil {
- pd.OwnerName = us.Username
- } else if gr := f.groupCache.lookup(owner.String()); gr != nil {
- pd.OwnerName = gr.Name
- pd.OwnerIsGroup = true
- } else {
- l.Debugf("Failed to resolve owner for %s: %v", rootedName, err)
- }
- return protocol.PlatformData{Windows: pd}, nil
- }
- func openReadOnlyWithBackupSemantics(path string) (fd windows.Handle, err error) {
- // This is windows.Open but simplified to read-only only, and adding
- // FILE_FLAG_BACKUP_SEMANTICS which is required to open directories.
- if len(path) == 0 {
- return windows.InvalidHandle, windows.ERROR_FILE_NOT_FOUND
- }
- pathp, err := windows.UTF16PtrFromString(path)
- if err != nil {
- return windows.InvalidHandle, err
- }
- var access uint32 = windows.GENERIC_READ
- var sharemode uint32 = windows.FILE_SHARE_READ | windows.FILE_SHARE_WRITE
- var sa *windows.SecurityAttributes
- var createmode uint32 = windows.OPEN_EXISTING
- var attrs uint32 = windows.FILE_ATTRIBUTE_READONLY | windows.FILE_FLAG_BACKUP_SEMANTICS
- return windows.CreateFile(pathp, access, sharemode, sa, createmode, attrs, 0)
- }
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