91b4f9f5fa
Signed-off-by: OHMURA Kei <ohmura.kei@lab.ntt.co.jp> Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
58 lines
1.9 KiB
Python
58 lines
1.9 KiB
Python
# Copyright (C) 2012 Nippon Telegraph and Telephone Corporation.
|
|
#
|
|
# Licensed under the Apache License, Version 2.0 (the "License");
|
|
# you may not use this file except in compliance with the License.
|
|
# You may obtain a copy of the License at
|
|
#
|
|
# http://www.apache.org/licenses/LICENSE-2.0
|
|
#
|
|
# Unless required by applicable law or agreed to in writing, software
|
|
# distributed under the License is distributed on an "AS IS" BASIS,
|
|
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
|
|
# implied.
|
|
# See the License for the specific language governing permissions and
|
|
# limitations under the License.
|
|
|
|
import struct
|
|
from . import packet_base
|
|
|
|
ARP_HW_TYPE_ETHERNET = 1 # ethernet hardware type
|
|
|
|
# arp operation codes
|
|
ARP_REQUEST = 1
|
|
ARP_REPLY = 2
|
|
ARP_REV_REQUEST = 3
|
|
ARP_REV_REPLY = 4
|
|
|
|
|
|
class arp(packet_base.PacketBase):
|
|
_PACK_STR = '!HHBBH6sI6sI'
|
|
_MIN_LEN = struct.calcsize(_PACK_STR)
|
|
|
|
def __init__(self, hwtype, proto, hlen, plen, opcode,
|
|
src_mac, src_ip, dst_mac, dst_ip):
|
|
super(arp, self).__init__()
|
|
self.hwtype = hwtype
|
|
self.proto = proto
|
|
self.hlen = hlen
|
|
self.plen = plen
|
|
self.opcode = opcode
|
|
self.src_mac = src_mac
|
|
self.src_ip = src_ip
|
|
self.dst_mac = dst_mac
|
|
self.dst_ip = dst_ip
|
|
self.length = arp._MIN_LEN
|
|
|
|
@classmethod
|
|
def parser(cls, buf):
|
|
(hwtype, proto, hlen, plen, opcode, src_mac, src_ip,
|
|
dst_mac, dst_ip) = struct.unpack_from(cls._PACK_STR, buf)
|
|
return cls(hwtype, proto, hlen, plen, opcode, src_mac, src_ip,
|
|
dst_mac, dst_ip), None
|
|
|
|
def serialize(self, payload, prev):
|
|
return struct.pack(arp._PACK_STR, self.hwtype, self.proto,
|
|
self.hlen, self.plen, self.opcode,
|
|
self.src_mac, self.src_ip, self.dst_mac,
|
|
self.dst_ip)
|