78 lines
2.2 KiB
Go
78 lines
2.2 KiB
Go
// +build linux
|
|
|
|
package selinux
|
|
|
|
import (
|
|
"syscall"
|
|
"unsafe"
|
|
)
|
|
|
|
var _zero uintptr
|
|
|
|
// Returns a []byte slice if the xattr is set and nil otherwise
|
|
// Requires path and its attribute as arguments
|
|
func lgetxattr(path string, attr string) ([]byte, error) {
|
|
var sz int
|
|
pathBytes, err := syscall.BytePtrFromString(path)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
attrBytes, err := syscall.BytePtrFromString(attr)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
// Start with a 128 length byte array
|
|
sz = 128
|
|
dest := make([]byte, sz)
|
|
destBytes := unsafe.Pointer(&dest[0])
|
|
_sz, _, errno := syscall.Syscall6(syscall.SYS_LGETXATTR, uintptr(unsafe.Pointer(pathBytes)), uintptr(unsafe.Pointer(attrBytes)), uintptr(destBytes), uintptr(len(dest)), 0, 0)
|
|
|
|
switch {
|
|
case errno == syscall.ENODATA:
|
|
return nil, errno
|
|
case errno == syscall.ENOTSUP:
|
|
return nil, errno
|
|
case errno == syscall.ERANGE:
|
|
// 128 byte array might just not be good enough,
|
|
// A dummy buffer is used ``uintptr(0)`` to get real size
|
|
// of the xattrs on disk
|
|
_sz, _, errno = syscall.Syscall6(syscall.SYS_LGETXATTR, uintptr(unsafe.Pointer(pathBytes)), uintptr(unsafe.Pointer(attrBytes)), uintptr(unsafe.Pointer(nil)), uintptr(0), 0, 0)
|
|
sz = int(_sz)
|
|
if sz < 0 {
|
|
return nil, errno
|
|
}
|
|
dest = make([]byte, sz)
|
|
destBytes := unsafe.Pointer(&dest[0])
|
|
_sz, _, errno = syscall.Syscall6(syscall.SYS_LGETXATTR, uintptr(unsafe.Pointer(pathBytes)), uintptr(unsafe.Pointer(attrBytes)), uintptr(destBytes), uintptr(len(dest)), 0, 0)
|
|
if errno != 0 {
|
|
return nil, errno
|
|
}
|
|
case errno != 0:
|
|
return nil, errno
|
|
}
|
|
sz = int(_sz)
|
|
return dest[:sz], nil
|
|
}
|
|
|
|
func lsetxattr(path string, attr string, data []byte, flags int) error {
|
|
pathBytes, err := syscall.BytePtrFromString(path)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
attrBytes, err := syscall.BytePtrFromString(attr)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
var dataBytes unsafe.Pointer
|
|
if len(data) > 0 {
|
|
dataBytes = unsafe.Pointer(&data[0])
|
|
} else {
|
|
dataBytes = unsafe.Pointer(&_zero)
|
|
}
|
|
_, _, errno := syscall.Syscall6(syscall.SYS_LSETXATTR, uintptr(unsafe.Pointer(pathBytes)), uintptr(unsafe.Pointer(attrBytes)), uintptr(dataBytes), uintptr(len(data)), uintptr(flags), 0)
|
|
if errno != 0 {
|
|
return errno
|
|
}
|
|
return nil
|
|
}
|