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// +build linux
// Package fusefrontend interfaces directly with the go-fuse library.
package fusefrontend
import (
"fmt"
"strings"
"syscall"
"golang.org/x/sys/unix"
"github.com/hanwen/go-fuse/fuse"
"github.com/rfjakob/gocryptfs/internal/syscallcompat"
)
// Only allow the "user" namespace, block "trusted" and "security", as
// these may be interpreted by the system, and we don't want to cause
// trouble with our encrypted garbage.
const xattrUserPrefix = "user."
func disallowedXAttrName(attr string) bool {
return !strings.HasPrefix(attr, xattrUserPrefix)
}
func filterXattrSetFlags(flags int) int {
return flags
}
func (fs *FS) getXAttr(relPath string, cAttr string, context *fuse.Context) ([]byte, fuse.Status) {
dirfd, cName, err := fs.openBackingDir(relPath)
if err != nil {
return nil, fuse.ToStatus(err)
}
defer syscall.Close(dirfd)
procPath := fmt.Sprintf("/proc/self/fd/%d/%s", dirfd, cName)
cData, err := syscallcompat.Lgetxattr(procPath, cAttr)
if err != nil {
return nil, fuse.ToStatus(err)
}
return cData, fuse.OK
}
func (fs *FS) setXAttr(relPath string, cAttr string, cData []byte, flags int, context *fuse.Context) fuse.Status {
dirfd, cName, err := fs.openBackingDir(relPath)
if err != nil {
return fuse.ToStatus(err)
}
defer syscall.Close(dirfd)
procPath := fmt.Sprintf("/proc/self/fd/%d/%s", dirfd, cName)
err = unix.Lsetxattr(procPath, cAttr, cData, flags)
return fuse.ToStatus(err)
}
func (fs *FS) removeXAttr(relPath string, cAttr string, context *fuse.Context) fuse.Status {
dirfd, cName, err := fs.openBackingDir(relPath)
if err != nil {
return fuse.ToStatus(err)
}
defer syscall.Close(dirfd)
procPath := fmt.Sprintf("/proc/self/fd/%d/%s", dirfd, cName)
err = unix.Lremovexattr(procPath, cAttr)
return fuse.ToStatus(err)
}
func (fs *FS) listXAttr(relPath string, context *fuse.Context) ([]string, fuse.Status) {
dirfd, cName, err := fs.openBackingDir(relPath)
if err != nil {
return nil, fuse.ToStatus(err)
}
defer syscall.Close(dirfd)
procPath := fmt.Sprintf("/proc/self/fd/%d/%s", dirfd, cName)
cNames, err := syscallcompat.Llistxattr(procPath)
if err != nil {
return nil, fuse.ToStatus(err)
}
return cNames, fuse.OK
}
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