v2api: implement Getxattr, Setxattr, Removexattr, Listxattr

gocryptfs/tests/xattr passes.

1 files changed, 68 insertions, 0 deletions

diff --git a/internal/fusefrontend/node_xattr_linux.go b/internal/fusefrontend/node_xattr_linux.go
new file mode 100644
index 0000000..342bdf6
--- /dev/null
+++ b/internal/fusefrontend/node_xattr_linux.go
@@ -0,0 +1,68 @@
+package fusefrontend
+
+import (
+	"fmt"
+	"syscall"
+
+	"golang.org/x/sys/unix"
+
+	"github.com/hanwen/go-fuse/v2/fs"
+
+	"github.com/rfjakob/gocryptfs/internal/syscallcompat"
+)
+
+func filterXattrSetFlags(flags int) int {
+	return flags
+}
+
+func (n *Node) getXAttr(cAttr string) (out []byte, errno syscall.Errno) {
+	dirfd, cName, errno := n.prepareAtSyscall("")
+	if errno != 0 {
+		return
+	}
+	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, 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)
+
+	procPath := fmt.Sprintf("/proc/self/fd/%d/%s", dirfd, cName)
+	return fs.ToErrno(unix.Lsetxattr(procPath, cAttr, cData, int(flags)))
+}
+
+func (n *Node) removeXAttr(cAttr string) (errno syscall.Errno) {
+	dirfd, cName, errno := n.prepareAtSyscall("")
+	if errno != 0 {
+		return
+	}
+	defer syscall.Close(dirfd)
+
+	procPath := fmt.Sprintf("/proc/self/fd/%d/%s", dirfd, cName)
+	return fs.ToErrno(unix.Lremovexattr(procPath, cAttr))
+}
+
+func (n *Node) listXAttr() (out []string, errno syscall.Errno) {
+	dirfd, cName, errno := n.prepareAtSyscall("")
+	if errno != 0 {
+		return
+	}
+	defer syscall.Close(dirfd)
+
+	procPath := fmt.Sprintf("/proc/self/fd/%d/%s", dirfd, cName)
+	cNames, err := syscallcompat.Llistxattr(procPath)
+	if err != nil {
+		return nil, fs.ToErrno(err)
+	}
+	return cNames, 0
+}