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package fusefrontend
import (
"syscall"
"golang.org/x/sys/unix"
"github.com/hanwen/go-fuse/v2/fs"
"github.com/rfjakob/gocryptfs/internal/syscallcompat"
)
// On Darwin we have to unset XATTR_NOSECURITY 0x0008
func filterXattrSetFlags(flags int) int {
// See https://opensource.apple.com/source/xnu/xnu-1504.15.3/bsd/sys/xattr.h.auto.html
const XATTR_NOSECURITY = 0x0008
return flags &^ XATTR_NOSECURITY
}
func (n *Node) getXAttr(cAttr string) (out []byte, errno syscall.Errno) {
dirfd, cName, errno := n.prepareAtSyscall("")
if errno != 0 {
return
}
defer syscall.Close(dirfd)
// O_NONBLOCK to not block on FIFOs.
fd, err := syscallcompat.Openat(dirfd, cName, syscall.O_RDONLY|syscall.O_NONBLOCK, 0)
if err != nil {
return nil, fs.ToErrno(err)
}
defer syscall.Close(fd)
cData, err := syscallcompat.Fgetxattr(fd, cAttr)
if err != nil {
return nil, fs.ToErrno(err)
}
return cData, 0
}
func (n *Node) setXAttr(cAttr string, cData []byte, flags uint32) (errno syscall.Errno) {
dirfd, cName, errno := n.prepareAtSyscall("")
if errno != 0 {
return
}
defer syscall.Close(dirfd)
// O_NONBLOCK to not block on FIFOs.
fd, err := syscallcompat.Openat(dirfd, cName, syscall.O_WRONLY|syscall.O_NONBLOCK, 0)
// Directories cannot be opened read-write. Retry.
if err == syscall.EISDIR {
fd, err = syscallcompat.Openat(dirfd, cName, syscall.O_RDONLY|syscall.O_DIRECTORY|syscall.O_NONBLOCK, 0)
}
if err != nil {
fs.ToErrno(err)
}
defer syscall.Close(fd)
err = unix.Fsetxattr(fd, cAttr, cData, int(flags))
return fs.ToErrno(err)
}
func (n *Node) removeXAttr(cAttr string) (errno syscall.Errno) {
dirfd, cName, errno := n.prepareAtSyscall("")
if errno != 0 {
return
}
defer syscall.Close(dirfd)
// O_NONBLOCK to not block on FIFOs.
fd, err := syscallcompat.Openat(dirfd, cName, syscall.O_WRONLY|syscall.O_NONBLOCK, 0)
// Directories cannot be opened read-write. Retry.
if err == syscall.EISDIR {
fd, err = syscallcompat.Openat(dirfd, cName, syscall.O_RDONLY|syscall.O_DIRECTORY|syscall.O_NONBLOCK, 0)
}
if err != nil {
return fs.ToErrno(err)
}
defer syscall.Close(fd)
err = unix.Fremovexattr(fd, cAttr)
return fs.ToErrno(err)
}
func (n *Node) listXAttr() (out []string, errno syscall.Errno) {
dirfd, cName, errno := n.prepareAtSyscall("")
if errno != 0 {
return
}
defer syscall.Close(dirfd)
// O_NONBLOCK to not block on FIFOs.
fd, err := syscallcompat.Openat(dirfd, cName, syscall.O_RDONLY|syscall.O_NONBLOCK, 0)
if err != nil {
return nil, fs.ToErrno(err)
}
defer syscall.Close(fd)
cNames, err := syscallcompat.Flistxattr(fd)
if err != nil {
return nil, fs.ToErrno(err)
}
return cNames, 0
}
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