// Bytes returns the byte slice representation of a netlink message.
func (m *Message) Bytes() ([]byte, error) {
if m.nlm == nil {
return nil, errors.New("no netlink message")
}
nlh := C.nlmsg_hdr(m.nlm)
nlb := make([]byte, nlh.nlmsg_len)
copy(nlb, (*[1 << 20]byte)(unsafe.Pointer(nlh))[:nlh.nlmsg_len])
return nlb, nil
}
// NewMessageFromBytes returns a netlink message that is initialised from the
// given byte slice.
func NewMessageFromBytes(nlb []byte) (*Message, error) {
nlm := C.nlmsg_alloc_size(C.size_t(len(nlb)))
if nlm == nil {
return nil, errors.New("failed to create netlink message")
}
nlh := C.nlmsg_hdr(nlm)
copy((*[1 << 20]byte)(unsafe.Pointer(nlh))[:len(nlb)], nlb)
return &Message{nlm: nlm}, nil
}
func parseMessage(nlm *C.struct_nl_msg, maxAttrID uint16) (map[uint16]*attribute, error) {
if nlm == nil {
return nil, errors.New("no netlink message")
}
nlas, err := newNLAttrs(uint(maxAttrID) + 1)
if err != nil {
return nil, err
}
defer nlas.free()
var nlaPolicy *C.struct_nla_policy
if errno := C.genlmsg_parse(C.nlmsg_hdr(nlm), 0, nlas.attrs, C.int(maxAttrID), nlaPolicy); errno != 0 {
return nil, &Error{errno, "failed to parse netlink message"}
}
return nlas.attributes(), nil
}