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Diffstat (limited to 'internal/fusefrontend_reverse/reverse_longnames.go')
-rw-r--r--internal/fusefrontend_reverse/reverse_longnames.go61
1 files changed, 61 insertions, 0 deletions
diff --git a/internal/fusefrontend_reverse/reverse_longnames.go b/internal/fusefrontend_reverse/reverse_longnames.go
new file mode 100644
index 0000000..46e1791
--- /dev/null
+++ b/internal/fusefrontend_reverse/reverse_longnames.go
@@ -0,0 +1,61 @@
+package fusefrontend_reverse
+
+import (
+ "os"
+ "path/filepath"
+ "syscall"
+
+ "github.com/hanwen/go-fuse/fuse"
+ "github.com/hanwen/go-fuse/fuse/nodefs"
+
+ "github.com/rfjakob/gocryptfs/internal/nametransform"
+)
+
+const (
+ shortNameMax = 176
+)
+
+func (rfs *reverseFS) findLongnameParent(dir string, dirIV []byte, longname string) (string, error) {
+ absDir := filepath.Join(rfs.args.Cipherdir, dir)
+ dirfd, err := os.Open(absDir)
+ if err != nil {
+ return "", err
+ }
+ dirEntries, err := dirfd.Readdirnames(-1)
+ if err != nil {
+ return "", err
+ }
+ for _, e := range dirEntries {
+ if len(e) <= shortNameMax {
+ continue
+ }
+ cName := rfs.nameTransform.EncryptName(e, dirIV)
+ if len(cName) <= syscall.NAME_MAX {
+ panic("logic error or wrong shortNameMax constant?")
+ }
+ hName := nametransform.HashLongName(cName)
+ if longname == hName {
+ return e, nil
+ }
+ }
+ return "", syscall.ENOENT
+}
+
+func (rfs *reverseFS) newNameFile(relPath string) (nodefs.File, fuse.Status) {
+ dotName := filepath.Base(relPath) // gocryptfs.longname.XYZ.name
+ longname := dotName[:len(dotName)-len(nametransform.LongNameSuffix)] // gocryptfs.longname.XYZ
+
+ cDir := saneDir(relPath)
+ pDir, err := rfs.decryptPath(cDir)
+ if err != nil {
+ return nil, fuse.ToStatus(err)
+ }
+ dirIV := deriveDirIV(cDir)
+ e, err := rfs.findLongnameParent(pDir, dirIV, longname)
+ if err != nil {
+ return nil, fuse.ToStatus(err)
+ }
+ content := []byte(rfs.nameTransform.EncryptName(e, dirIV))
+ parentFile := filepath.Join(rfs.args.Cipherdir, pDir)
+ return rfs.NewVirtualFile(content, parentFile)
+}