Class ARP

scapy/layers/l2.py:471–594

class ARP(Packet):
    name = "ARP"
    fields_desc = [
        XShortEnumField("hwtype", 0x0001, HARDWARE_TYPES),
        XShortEnumField("ptype", 0x0800, ETHER_TYPES),
        FieldLenField("hwlen", None, fmt="B", length_of="hwsrc"),
        FieldLenField("plen", None, fmt="B", length_of="psrc"),
        ShortEnumField("op", 1, {
            "who-has": 1,
            "is-at": 2,
            "RARP-req": 3,
            "RARP-rep": 4,
            "Dyn-RARP-req": 5,
            "Dyn-RAR-rep": 6,
            "Dyn-RARP-err": 7,
            "InARP-req": 8,
            "InARP-rep": 9
        }),
        MultipleTypeField(
            [
                (SourceMACField("hwsrc"),
                 (lambda pkt: pkt.hwtype == 1 and pkt.hwlen == 6,
                  lambda pkt, val: pkt.hwtype == 1 and (
                      pkt.hwlen == 6 or (pkt.hwlen is None and
                                         (val is None or len(val) == 6 or
                                          valid_mac(val)))
                  ))),
            ],
            StrFixedLenField("hwsrc", None, length_from=lambda pkt: pkt.hwlen),
        ),
        MultipleTypeField(
            [
                (SourceIPField("psrc"),
                 (lambda pkt: pkt.ptype == 0x0800 and pkt.plen == 4,
                  lambda pkt, val: pkt.ptype == 0x0800 and (
                      pkt.plen == 4 or (pkt.plen is None and
                                        (val is None or valid_net(val)))
                  ))),
                (SourceIP6Field("psrc"),
                 (lambda pkt: pkt.ptype == 0x86dd and pkt.plen == 16,
                  lambda pkt, val: pkt.ptype == 0x86dd and (
                      pkt.plen == 16 or (pkt.plen is None and
                                         (val is None or valid_net6(val)))
                  ))),
            ],
            StrFixedLenField("psrc", None, length_from=lambda pkt: pkt.plen),
        ),
        MultipleTypeField(
            [
                (MACField("hwdst", ETHER_ANY),
                 (lambda pkt: pkt.hwtype == 1 and pkt.hwlen == 6,
                  lambda pkt, val: pkt.hwtype == 1 and (
                      pkt.hwlen == 6 or (pkt.hwlen is None and
                                         (val is None or len(val) == 6 or
                                          valid_mac(val)))
                  ))),
            ],
            StrFixedLenField("hwdst", None, length_from=lambda pkt: pkt.hwlen),