62 lines
1.5 KiB
Go
62 lines
1.5 KiB
Go
package fusefrontend_reverse
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import (
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"os"
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"path/filepath"
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"syscall"
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"github.com/hanwen/go-fuse/fuse"
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"github.com/hanwen/go-fuse/fuse/nodefs"
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"github.com/rfjakob/gocryptfs/internal/nametransform"
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)
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const (
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shortNameMax = 176
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)
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func (rfs *reverseFS) findLongnameParent(dir string, dirIV []byte, longname string) (string, error) {
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absDir := filepath.Join(rfs.args.Cipherdir, dir)
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dirfd, err := os.Open(absDir)
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if err != nil {
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return "", err
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}
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dirEntries, err := dirfd.Readdirnames(-1)
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if err != nil {
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return "", err
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}
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for _, e := range dirEntries {
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if len(e) <= shortNameMax {
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continue
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}
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cName := rfs.nameTransform.EncryptName(e, dirIV)
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if len(cName) <= syscall.NAME_MAX {
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panic("logic error or wrong shortNameMax constant?")
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}
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hName := nametransform.HashLongName(cName)
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if longname == hName {
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return e, nil
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}
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}
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return "", syscall.ENOENT
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}
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func (rfs *reverseFS) newNameFile(relPath string) (nodefs.File, fuse.Status) {
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dotName := filepath.Base(relPath) // gocryptfs.longname.XYZ.name
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longname := dotName[:len(dotName)-len(nametransform.LongNameSuffix)] // gocryptfs.longname.XYZ
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cDir := saneDir(relPath)
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pDir, err := rfs.decryptPath(cDir)
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if err != nil {
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return nil, fuse.ToStatus(err)
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}
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dirIV := deriveDirIV(cDir)
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e, err := rfs.findLongnameParent(pDir, dirIV, longname)
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if err != nil {
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return nil, fuse.ToStatus(err)
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}
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content := []byte(rfs.nameTransform.EncryptName(e, dirIV))
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parentFile := filepath.Join(rfs.args.Cipherdir, pDir)
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return rfs.NewVirtualFile(content, parentFile)
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}
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