v2pai: delete fusefrontend_reverse_v1api

Served its mission a copy-paste source but can now be deleted.

1 files changed, 0 insertions, 209 deletions

diff --git a/internal/fusefrontend_reverse_v1api/rfile.go b/internal/fusefrontend_reverse_v1api/rfile.go
deleted file mode 100644
index 68f7309..0000000
--- a/internal/fusefrontend_reverse_v1api/rfile.go
+++ /dev/null
@@ -1,209 +0,0 @@
-package fusefrontend_reverse
-
-import (
-	"bytes"
-	"io"
-	"os"
-	"path/filepath"
-	"syscall"
-
-	// In newer Go versions, this has moved to just "sync/syncmap".
-	"golang.org/x/sync/syncmap"
-
-	"github.com/hanwen/go-fuse/v2/fuse"
-	"github.com/hanwen/go-fuse/v2/fuse/nodefs"
-
-	"github.com/rfjakob/gocryptfs/internal/contentenc"
-	"github.com/rfjakob/gocryptfs/internal/pathiv"
-	"github.com/rfjakob/gocryptfs/internal/syscallcompat"
-	"github.com/rfjakob/gocryptfs/internal/tlog"
-)
-
-type reverseFile struct {
-	// Embed nodefs.defaultFile for a ENOSYS implementation of all methods
-	nodefs.File
-	// Backing FD
-	fd *os.File
-	// File header (contains the IV)
-	header contentenc.FileHeader
-	// IV for block 0
-	block0IV []byte
-	// Content encryption helper
-	contentEnc *contentenc.ContentEnc
-}
-
-var inodeTable syncmap.Map
-
-// newFile receives a ciphered path "relPath" and its corresponding
-// decrypted path "pRelPath", opens it and returns a reverseFile
-// object. The backing file descriptor is always read-only.
-func (rfs *ReverseFS) newFile(relPath string, pRelPath string) (*reverseFile, fuse.Status) {
-	if rfs.isExcludedPlain(pRelPath) {
-		// Excluded paths should have been filtered out beforehand. Better safe
-		// than sorry.
-		tlog.Warn.Printf("BUG: newFile: received excluded path %q. This should not happen.", relPath)
-		return nil, fuse.ENOENT
-	}
-	dir := filepath.Dir(pRelPath)
-	dirfd, err := syscallcompat.OpenDirNofollow(rfs.args.Cipherdir, dir)
-	if err != nil {
-		return nil, fuse.ToStatus(err)
-	}
-	fd, err := syscallcompat.Openat(dirfd, filepath.Base(pRelPath), syscall.O_RDONLY|syscall.O_NOFOLLOW, 0)
-	syscall.Close(dirfd)
-	if err != nil {
-		return nil, fuse.ToStatus(err)
-	}
-	var st syscall.Stat_t
-	err = syscall.Fstat(fd, &st)
-	if err != nil {
-		tlog.Warn.Printf("newFile: Fstat error: %v", err)
-		syscall.Close(fd)
-		return nil, fuse.ToStatus(err)
-	}
-	// Reject access if the file descriptor does not refer to a regular file.
-	var a fuse.Attr
-	a.FromStat(&st)
-	if !a.IsRegular() {
-		tlog.Warn.Printf("ino%d: newFile: not a regular file", st.Ino)
-		syscall.Close(fd)
-		return nil, fuse.ToStatus(syscall.EACCES)
-	}
-	// See if we have that inode number already in the table
-	// (even if Nlink has dropped to 1)
-	var derivedIVs pathiv.FileIVs
-	v, found := inodeTable.Load(st.Ino)
-	if found {
-		tlog.Debug.Printf("ino%d: newFile: found in the inode table", st.Ino)
-		derivedIVs = v.(pathiv.FileIVs)
-	} else {
-		derivedIVs = pathiv.DeriveFile(relPath)
-		// Nlink > 1 means there is more than one path to this file.
-		// Store the derived values so we always return the same data,
-		// regardless of the path that is used to access the file.
-		// This means that the first path wins.
-		if st.Nlink > 1 {
-			v, found = inodeTable.LoadOrStore(st.Ino, derivedIVs)
-			if found {
-				// Another thread has stored a different value before we could.
-				derivedIVs = v.(pathiv.FileIVs)
-			} else {
-				tlog.Debug.Printf("ino%d: newFile: Nlink=%d, stored in the inode table", st.Ino, st.Nlink)
-			}
-		}
-	}
-	header := contentenc.FileHeader{
-		Version: contentenc.CurrentVersion,
-		ID:      derivedIVs.ID,
-	}
-	return &reverseFile{
-		File:       nodefs.NewDefaultFile(),
-		fd:         os.NewFile(uintptr(fd), pRelPath),
-		header:     header,
-		block0IV:   derivedIVs.Block0IV,
-		contentEnc: rfs.contentEnc,
-	}, fuse.OK
-}
-
-// GetAttr - FUSE call
-// Triggered by fstat() from userspace
-func (rf *reverseFile) GetAttr(*fuse.Attr) fuse.Status {
-	tlog.Debug.Printf("reverseFile.GetAttr fd=%d\n", rf.fd.Fd())
-	// The kernel should fall back to stat()
-	return fuse.ENOSYS
-}
-
-// encryptBlocks - encrypt "plaintext" into a number of ciphertext blocks.
-// "plaintext" must already be block-aligned.
-func (rf *reverseFile) encryptBlocks(plaintext []byte, firstBlockNo uint64, fileID []byte, block0IV []byte) []byte {
-	inBuf := bytes.NewBuffer(plaintext)
-	var outBuf bytes.Buffer
-	bs := int(rf.contentEnc.PlainBS())
-	for blockNo := firstBlockNo; inBuf.Len() > 0; blockNo++ {
-		inBlock := inBuf.Next(bs)
-		iv := pathiv.BlockIV(block0IV, blockNo)
-		outBlock := rf.contentEnc.EncryptBlockNonce(inBlock, blockNo, fileID, iv)
-		outBuf.Write(outBlock)
-	}
-	return outBuf.Bytes()
-}
-
-// readBackingFile: read from the backing plaintext file, encrypt it, return the
-// ciphertext.
-// "off" ... ciphertext offset (must be >= HEADER_LEN)
-// "length" ... ciphertext length
-func (rf *reverseFile) readBackingFile(off uint64, length uint64) (out []byte, err error) {
-	blocks := rf.contentEnc.ExplodeCipherRange(off, length)
-
-	// Read the backing plaintext in one go
-	alignedOffset, alignedLength := contentenc.JointPlaintextRange(blocks)
-	plaintext := make([]byte, int(alignedLength))
-	n, err := rf.fd.ReadAt(plaintext, int64(alignedOffset))
-	if err != nil && err != io.EOF {
-		tlog.Warn.Printf("readBackingFile: ReadAt: %s", err.Error())
-		return nil, err
-	}
-	// Truncate buffer down to actually read bytes
-	plaintext = plaintext[0:n]
-
-	// Encrypt blocks
-	ciphertext := rf.encryptBlocks(plaintext, blocks[0].BlockNo, rf.header.ID, rf.block0IV)
-
-	// Crop down to the relevant part
-	lenHave := len(ciphertext)
-	skip := blocks[0].Skip
-	endWant := int(skip + length)
-	if lenHave > endWant {
-		out = ciphertext[skip:endWant]
-	} else if lenHave > int(skip) {
-		out = ciphertext[skip:lenHave]
-	} // else: out stays empty, file was smaller than the requested offset
-
-	return out, nil
-}
-
-// Read - FUSE call
-func (rf *reverseFile) Read(buf []byte, ioff int64) (resultData fuse.ReadResult, status fuse.Status) {
-	length := uint64(len(buf))
-	off := uint64(ioff)
-	var out bytes.Buffer
-	var header []byte
-
-	// Synthesize file header
-	if off < contentenc.HeaderLen {
-		header = rf.header.Pack()
-		// Truncate to requested part
-		end := int(off) + len(buf)
-		if end > len(header) {
-			end = len(header)
-		}
-		header = header[off:end]
-		// Write into output buffer and adjust offsets
-		out.Write(header)
-		hLen := uint64(len(header))
-		off += hLen
-		length -= hLen
-	}
-
-	// Read actual file data
-	if length > 0 {
-		fileData, err := rf.readBackingFile(off, length)
-		if err != nil {
-			return nil, fuse.ToStatus(err)
-		}
-		if len(fileData) == 0 {
-			// If we could not read any actual data, we also don't want to
-			// return the file header. An empty file stays empty in encrypted
-			// form.
-			return nil, fuse.OK
-		}
-		out.Write(fileData)
-	}
-
-	return fuse.ReadResultData(out.Bytes()), fuse.OK
-}
-
-// Release - FUSE call, close file
-func (rf *reverseFile) Release() {
-	rf.fd.Close()
-}