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package fusefrontend_reverse
import (
"context"
"syscall"
"golang.org/x/sys/unix"
"github.com/hanwen/go-fuse/v2/fs"
"github.com/hanwen/go-fuse/v2/fuse"
"github.com/rfjakob/gocryptfs/internal/configfile"
"github.com/rfjakob/gocryptfs/internal/nametransform"
"github.com/rfjakob/gocryptfs/internal/pathiv"
"github.com/rfjakob/gocryptfs/internal/syscallcompat"
)
// Readdir - FUSE call.
//
// This function is symlink-safe through use of openBackingDir() and
// ReadDirIVAt().
func (n *Node) Readdir(ctx context.Context) (stream fs.DirStream, errno syscall.Errno) {
dirfd, cName, errno := n.prepareAtSyscall("")
if errno != 0 {
return
}
defer syscall.Close(dirfd)
// Read plaintext directory
var entries []fuse.DirEntry
fd, err := syscallcompat.Openat(dirfd, cName, syscall.O_RDONLY|syscall.O_DIRECTORY|syscall.O_NOFOLLOW, 0)
if err != nil {
return nil, fs.ToErrno(err)
}
defer syscall.Close(fd)
entries, err = syscallcompat.Getdents(fd)
if err != nil {
return nil, fs.ToErrno(err)
}
rn := n.rootNode()
if rn.args.PlaintextNames {
panic("todo")
}
// Filter out excluded entries
//TODO
//entries = rfs.excludeDirEntries(relPath, entries)
// Virtual files: at least one gocryptfs.diriv file
virtualFiles := []fuse.DirEntry{
{Mode: virtualFileMode, Name: nametransform.DirIVFilename},
}
cipherPath := n.Path()
dirIV := pathiv.Derive(cipherPath, pathiv.PurposeDirIV)
// Encrypt names
for i := range entries {
var cName string
// ".gocryptfs.reverse.conf" in the root directory is mapped to "gocryptfs.conf"
if n.isRoot() && entries[i].Name == configfile.ConfReverseName &&
!rn.args.ConfigCustom {
cName = configfile.ConfDefaultName
} else {
cName = rn.nameTransform.EncryptName(entries[i].Name, dirIV)
if len(cName) > unix.NAME_MAX {
cName = rn.nameTransform.HashLongName(cName)
dotNameFile := fuse.DirEntry{
Mode: virtualFileMode,
Name: cName + nametransform.LongNameSuffix,
}
virtualFiles = append(virtualFiles, dotNameFile)
}
}
entries[i].Name = cName
}
// Add virtual files
entries = append(entries, virtualFiles...)
return fs.NewListDirStream(entries), 0
}
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