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package sftp
import (
"fmt"
"io"
"io/fs"
"os"
"path"
"path/filepath"
"time"
"golang.org/x/sys/windows"
)
func (s *Server) toLocalPath(p string) string {
if s.workDir != "" && !path.IsAbs(p) {
p = path.Join(s.workDir, p)
}
lp := filepath.FromSlash(p)
if path.IsAbs(p) { // starts with '/'
if len(p) == 1 && s.winRoot {
return `\\.\` // for openfile
}
tmp := lp
for len(tmp) > 0 && tmp[0] == '\\' {
tmp = tmp[1:]
}
if filepath.IsAbs(tmp) {
// If the FromSlash without any starting slashes is absolute,
// then we have a filepath encoded with a prefix '/'.
// e.g. "/C:/Windows" to "C:\\Windows"
return tmp
}
tmp += "\\"
if filepath.IsAbs(tmp) {
// If the FromSlash without any starting slashes but with extra end slash is absolute,
// then we have a filepath encoded with a prefix '/' and a dropped '/' at the end.
// e.g. "/C:" to "C:\\"
return tmp
}
if s.winRoot {
// Make it so that "/Windows" is not found, and "/c:/Windows" has to be used
return `\\.\` + tmp
}
}
return lp
}
func bitsToDrives(bitmap uint32) []string {
var drive rune = 'a'
var drives []string
for bitmap != 0 && drive <= 'z' {
if bitmap&1 == 1 {
drives = append(drives, string(drive)+":")
}
drive++
bitmap >>= 1
}
return drives
}
func getDrives() ([]string, error) {
mask, err := windows.GetLogicalDrives()
if err != nil {
return nil, fmt.Errorf("GetLogicalDrives: %w", err)
}
return bitsToDrives(mask), nil
}
type driveInfo struct {
fs.FileInfo
name string
}
func (i *driveInfo) Name() string {
return i.name // since the Name() returned from a os.Stat("C:\\") is "\\"
}
type winRoot struct {
drives []string
}
func newWinRoot() (*winRoot, error) {
drives, err := getDrives()
if err != nil {
return nil, err
}
return &winRoot{
drives: drives,
}, nil
}
func (f *winRoot) Readdir(n int) ([]os.FileInfo, error) {
drives := f.drives
if n > 0 && len(drives) > n {
drives = drives[:n]
}
f.drives = f.drives[len(drives):]
if len(drives) == 0 {
return nil, io.EOF
}
var infos []os.FileInfo
for _, drive := range drives {
fi, err := os.Stat(drive + `\`)
if err != nil {
return nil, err
}
di := &driveInfo{
FileInfo: fi,
name: drive,
}
infos = append(infos, di)
}
return infos, nil
}
func (f *winRoot) Stat() (os.FileInfo, error) {
return rootFileInfo, nil
}
func (f *winRoot) ReadAt(b []byte, off int64) (int, error) {
return 0, os.ErrPermission
}
func (f *winRoot) WriteAt(b []byte, off int64) (int, error) {
return 0, os.ErrPermission
}
func (f *winRoot) Name() string {
return "/"
}
func (f *winRoot) Truncate(int64) error {
return os.ErrPermission
}
func (f *winRoot) Chmod(mode fs.FileMode) error {
return os.ErrPermission
}
func (f *winRoot) Chown(uid, gid int) error {
return os.ErrPermission
}
func (f *winRoot) Close() error {
f.drives = nil
return nil
}
func (s *Server) openfile(path string, flag int, mode fs.FileMode) (file, error) {
if path == `\\.\` && s.winRoot {
return newWinRoot()
}
return os.OpenFile(path, flag, mode)
}
type winRootFileInfo struct {
name string
modTime time.Time
}
func (w *winRootFileInfo) Name() string { return w.name }
func (w *winRootFileInfo) Size() int64 { return 0 }
func (w *winRootFileInfo) Mode() fs.FileMode { return fs.ModeDir | 0555 } // read+execute for all
func (w *winRootFileInfo) ModTime() time.Time { return w.modTime }
func (w *winRootFileInfo) IsDir() bool { return true }
func (w *winRootFileInfo) Sys() interface{} { return nil }
// Create a new root FileInfo
var rootFileInfo = &winRootFileInfo{
name: "/",
modTime: time.Now(),
}
func (s *Server) lstat(name string) (os.FileInfo, error) {
if name == `\\.\` && s.winRoot {
return rootFileInfo, nil
}
return os.Lstat(name)
}
func (s *Server) stat(name string) (os.FileInfo, error) {
if name == `\\.\` && s.winRoot {
return rootFileInfo, nil
}
return os.Stat(name)
}
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