package dump // Adapted from https://github.com/maxymania/go-system/blob/master/posix_acl/posix_acl.go import ( "bytes" "encoding/binary" "fmt" ) const ( aclUserOwner = 0x0001 aclUser = 0x0002 aclGroupOwner = 0x0004 aclGroup = 0x0008 aclMask = 0x0010 aclOthers = 0x0020 ) type aclSID uint64 type aclElem struct { Tag uint16 Perm uint16 ID uint32 } type acl struct { Version uint32 List []aclElement } type aclElement struct { aclSID Perm uint16 } func (a aclSID) getType() int { return int(a >> 32) } func (a aclSID) getID() uint32 { return uint32(a & 0xffffffff) } func (a aclSID) String() string { switch a >> 32 { case aclUserOwner: return "user::" case aclUser: return fmt.Sprintf("user:%v:", a.getID()) case aclGroupOwner: return "group::" case aclGroup: return fmt.Sprintf("group:%v:", a.getID()) case aclMask: return "mask::" case aclOthers: return "other::" } return "?:" } func (a aclElement) String() string { str := "" if (a.Perm & 4) != 0 { str += "r" } else { str += "-" } if (a.Perm & 2) != 0 { str += "w" } else { str += "-" } if (a.Perm & 1) != 0 { str += "x" } else { str += "-" } return fmt.Sprintf("%v%v", a.aclSID, str) } func (a *acl) decode(xattr []byte) { var elem aclElement ae := new(aclElem) nr := bytes.NewReader(xattr) e := binary.Read(nr, binary.LittleEndian, &a.Version) if e != nil { a.Version = 0 return } if len(a.List) > 0 { a.List = a.List[:0] } for binary.Read(nr, binary.LittleEndian, ae) == nil { elem.aclSID = (aclSID(ae.Tag) << 32) | aclSID(ae.ID) elem.Perm = ae.Perm a.List = append(a.List, elem) } } func (a *acl) encode() []byte { buf := new(bytes.Buffer) ae := new(aclElem) binary.Write(buf, binary.LittleEndian, &a.Version) for _, elem := range a.List { ae.Tag = uint16(elem.getType()) ae.Perm = elem.Perm ae.ID = elem.getID() binary.Write(buf, binary.LittleEndian, ae) } return buf.Bytes() } func (a *acl) String() string { var finalacl string for _, acl := range a.List { finalacl += acl.String() + "\n" } return finalacl }