Rename frontend to "cluefs_frontend"

Enables adding another frontend later

1 files changed, 0 insertions, 152 deletions

diff --git a/frontend/fe_file.go b/frontend/fe_file.go
deleted file mode 100644
index 4679589..0000000
--- a/frontend/fe_file.go
+++ /dev/null
@@ -1,152 +0,0 @@
-package frontend
-
-// frontend sits between FUSE and ClueFS
-// and uses cryptfs for all crypto operations
-//
-//          cryptfs
-//             ^
-//             |
-//             v
-// FUSE <-> frontend <-> ClueFS
-//
-// This file handles files access
-
-import (
-	"fmt"
-	"github.com/rfjakob/gocryptfs/cryptfs"
-	"github.com/rfjakob/cluefs/lib/cluefs"
-
-	"bazil.org/fuse"
-	fusefs "bazil.org/fuse/fs"
-	"golang.org/x/net/context"
-)
-
-func fixFlags(flags fuse.OpenFlags) (fuse.OpenFlags, bool) {
-	cryptfs.Debug.Printf("fixFlags: Before: %s\n", flags.String())
-	var writeOnly bool
-	// We always need read access to do read-modify-write cycles
-	if flags & fuse.OpenWriteOnly > 0 {
-		flags = flags &^ fuse.OpenWriteOnly
-		flags = flags | fuse.OpenReadWrite
-		writeOnly = true
-	}
-	// We also cannot open the file in append mode, we need to seek back for RMW
-	flags = flags &^ fuse.OpenAppend
-	cryptfs.Debug.Printf("fixFlags: After: %s\n", flags.String())
-	return flags, writeOnly
-}
-
-func max(x int, y int) int {
-	if x > y {
-		return x
-	}
-	return y
-}
-
-type File struct {
-	*cluefs.File
-	crfs *cryptfs.CryptFS
-	// Remember if the file is supposed to be write-only
-	writeOnly bool
-}
-
-func (f *File) Open(ctx context.Context, req *fuse.OpenRequest, resp *fuse.OpenResponse) (fusefs.Handle, error) {
-	cryptfs.Debug.Printf("File.Open\n")
-
-	req.Flags, f.writeOnly = fixFlags(req.Flags)
-
-	h, err := f.File.Open(ctx, req, resp)
-	if err != nil {
-		return nil, err
-	}
-	clueFile := h.(*cluefs.File)
-	return &File {
-		File: clueFile,
-		crfs: f.crfs,
-	}, nil
-}
-
-func (f *File) Read(ctx context.Context, req *fuse.ReadRequest, resp *fuse.ReadResponse) error {
-
-	cryptfs.Debug.Printf("Read: o=%d l=%d\n", req.Offset, req.Size)
-
-	// Read the backing ciphertext in one go
-	iblocks := f.crfs.SplitRange(uint64(req.Offset), uint64(req.Size))
-	var cipherReq fuse.ReadRequest
-	var cipherResp fuse.ReadResponse
-	o, l := f.crfs.JoinCiphertextRange(iblocks)
-	cipherResp.Data = make([]byte, int(l))
-	cipherReq.Offset = int64(o)
-	cipherReq.Size = int(l)
-	cryptfs.Debug.Printf("Read: cipherReq o=%d l=%d\n", o, l)
-	err := f.File.Read(ctx, &cipherReq, &cipherResp)
-	if err != nil {
-		return err
-	}
-
-	// Decrypt it
-	plaintext, err := f.crfs.DecryptBlocks(cipherResp.Data)
-	if err != nil {
-		resp.Data = plaintext
-		return err
-	}
-	// Crop down to relevant part
-	resp.Data = f.crfs.CropPlaintext(plaintext, iblocks)
-
-	return nil
-}
-
-func (f *File) Write(ctx context.Context, req *fuse.WriteRequest, resp *fuse.WriteResponse) error {
-	cryptfs.Debug.Printf("File.Write\n")
-	resp.Size = 0
-	iblocks := f.crfs.SplitRange(uint64(req.Offset), uint64(len(req.Data)))
-	var blockData []byte
-	for _, ib := range iblocks {
-		if ib.IsPartial() {
-			// RMW
-			cryptfs.Debug.Printf("RMW\n")
-			blockData = make([]byte, f.crfs.PlainBS())
-			var readReq fuse.ReadRequest
-			var readResp fuse.ReadResponse
-			o, l := ib.PlaintextRange()
-			readReq.Offset = int64(o)
-			readReq.Size = int(l)
-			err := f.Read(ctx, &readReq, &readResp)
-			if err != nil {
-				return err
-			}
-			copy(blockData, readResp.Data)
-			copy(blockData[ib.Offset:ib.Offset+ib.Length], req.Data)
-			blockLen := max(len(readResp.Data), int(ib.Offset+ib.Length))
-			blockData = blockData[0:blockLen]
-		} else {
-			blockData = req.Data[0:f.crfs.PlainBS()]
-		}
-		ciphertext := f.crfs.EncryptBlock(blockData)
-		var partReq fuse.WriteRequest
-		var partResp fuse.WriteResponse
-		o, _ := ib.CiphertextRange()
-		partReq.Data = ciphertext
-		partReq.Offset = int64(o)
-		err := f.File.Write(ctx, &partReq, &partResp)
-		if err != nil {
-			fmt.Printf("Write failure: %s\n", err.Error())
-			return err
-		}
-		// Remove written data from the front of the request
-		cryptfs.Debug.Printf("req.Data[%d:%d]\n", int(ib.Length), len(req.Data))
-		req.Data = req.Data[int(ib.Length):len(req.Data)]
-		resp.Size += int(ib.Length)
-	}
-	return nil
-}
-
-func (f *File) Attr(ctx context.Context, attr *fuse.Attr) error {
-	cryptfs.Debug.Printf("Attr\n")
-	err := f.File.Node.Attr(ctx, attr)
-	if err != nil {
-		return err
-	}
-	attr.Size = f.crfs.PlainSize(attr.Size)
-	return nil
-}