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-rw-r--r--cryptfs/cryptfs_content.go16
-rw-r--r--cryptfs/log.go1
-rw-r--r--main.go8
-rw-r--r--pathfs_frontend/file.go1
-rw-r--r--pathfs_frontend/fs.go21
5 files changed, 35 insertions, 12 deletions
diff --git a/cryptfs/cryptfs_content.go b/cryptfs/cryptfs_content.go
index b9dd61f..374b4f4 100644
--- a/cryptfs/cryptfs_content.go
+++ b/cryptfs/cryptfs_content.go
@@ -97,12 +97,20 @@ func (be *CryptFS) SplitRange(offset uint64, length uint64) []intraBlock {
// PlainSize - calculate plaintext size from ciphertext size
func (be *CryptFS) PlainSize(size uint64) uint64 {
+
// Zero sized files stay zero-sized
- if size > 0 {
- overhead := be.cipherBS - be.plainBS
- nBlocks := (size + be.cipherBS - 1) / be.cipherBS
- size -= nBlocks * overhead
+ if size == 0 {
+ return 0
+ }
+
+ overhead := be.cipherBS - be.plainBS
+ nBlocks := (size + be.cipherBS - 1) / be.cipherBS
+ if nBlocks * overhead > size {
+ Warn.Printf("PlainSize: Negative size, returning 0 instead\n")
+ return 0
}
+ size -= nBlocks * overhead
+
return size
}
diff --git a/cryptfs/log.go b/cryptfs/log.go
index 03d1e29..d40aa3f 100644
--- a/cryptfs/log.go
+++ b/cryptfs/log.go
@@ -26,4 +26,5 @@ func (l *logChannel) Enable() {
var Debug = logChannel{false}
+var Notice = logChannel{true}
var Warn = logChannel{true}
diff --git a/main.go b/main.go
index 4563b9c..30deb1e 100644
--- a/main.go
+++ b/main.go
@@ -64,10 +64,10 @@ func initDir(dirArg string) {
func main() {
// Parse command line arguments
- var debug bool
- var init bool
- var zerokey bool
+ var debug, init, zerokey, fusedebug bool
+
flag.BoolVar(&debug, "debug", false, "Enable debug output")
+ flag.BoolVar(&fusedebug, "fusedebug", false, "Enable fuse library debug output")
flag.BoolVar(&init, "init", false, "Initialize encrypted directory")
flag.BoolVar(&zerokey, "zerokey", false, "Use all-zero dummy master key")
flag.Parse()
@@ -123,7 +123,7 @@ func main() {
if USE_CLUEFS {
cluefsFrontend(key, cipherdir, mountpoint)
} else {
- pathfsFrontend(key, cipherdir, mountpoint, debug)
+ pathfsFrontend(key, cipherdir, mountpoint, fusedebug)
}
}
diff --git a/pathfs_frontend/file.go b/pathfs_frontend/file.go
index 493a223..8cf070c 100644
--- a/pathfs_frontend/file.go
+++ b/pathfs_frontend/file.go
@@ -210,6 +210,7 @@ func (f *file) Chown(uid uint32, gid uint32) fuse.Status {
}
func (f *file) GetAttr(a *fuse.Attr) fuse.Status {
+ cryptfs.Debug.Printf("file.GetAttr()\n")
st := syscall.Stat_t{}
f.lock.Lock()
err := syscall.Fstat(int(f.fd.Fd()), &st)
diff --git a/pathfs_frontend/fs.go b/pathfs_frontend/fs.go
index 85fbbaf..bf93766 100644
--- a/pathfs_frontend/fs.go
+++ b/pathfs_frontend/fs.go
@@ -34,16 +34,24 @@ func (fs *FS) GetPath(relPath string) string {
}
func (fs *FS) GetAttr(name string, context *fuse.Context) (*fuse.Attr, fuse.Status) {
- a, status := fs.FileSystem.GetAttr(fs.EncryptPath(name), context)
+ cryptfs.Debug.Printf("FS.GetAttr('%s')\n", name)
+ cName := fs.EncryptPath(name)
+ a, status := fs.FileSystem.GetAttr(cName, context)
if a == nil {
+ cryptfs.Notice.Printf("FS.GetAttr failed: %s\n", status.String())
return a, status
}
-
- a.Size = fs.PlainSize(a.Size)
+ if a.IsRegular() {
+ a.Size = fs.PlainSize(a.Size)
+ } else if a.IsSymlink() {
+ target, _ := fs.Readlink(name, context)
+ a.Size = uint64(len(target))
+ }
return a, status
}
func (fs *FS) OpenDir(dirName string, context *fuse.Context) ([]fuse.DirEntry, fuse.Status) {
+ cryptfs.Debug.Printf("OpenDir(%s)\n", dirName)
cipherEntries, status := fs.FileSystem.OpenDir(fs.EncryptPath(dirName), context);
var plain []fuse.DirEntry
if cipherEntries != nil {
@@ -137,7 +145,12 @@ func (fs *FS) Mkdir(path string, mode uint32, context *fuse.Context) (code fuse.
}
func (fs *FS) Unlink(name string, context *fuse.Context) (code fuse.Status) {
- return fs.FileSystem.Unlink(fs.EncryptPath(name), context)
+ cName := fs.EncryptPath(name)
+ code = fs.FileSystem.Unlink(cName, context)
+ if code != fuse.OK {
+ cryptfs.Notice.Printf("Unlink failed on %s [%s], code=%s\n", name, cName, code.String())
+ }
+ return code
}
func (fs *FS) Rmdir(name string, context *fuse.Context) (code fuse.Status) {