Question

我在python中编程并且我遇到了问题，实际上当我抛出我的脚本时，它会在检测到IP6数据包后几秒钟结束。显然我必须过滤数据包，只采取IP4数据包，以避免这个问题，我想知道我怎么可以使用它与库dpkt如果可能的话，因为我开始。我尝试了一些东西，但我是一个初学者，它不会像你在这一行中看到的那样工作：

#Select Ipv4 packets because of problem with the .p in Ipv6
            if ip.p == dpkt.ip6:
                return`

遇到的错误说：＆＃34;属性错误：＆＃39; IP6＆＃39;对象没有属性＆＃39;＆＃39;＆＃34;。这是追溯： traceback

这是我的代码，如果你想看看:) 谢谢你的时间:)

import pcapy
import dpkt
from threading import Thread
import re
import binascii

liste=[]
listip=[]
piece_request_handshake = re.compile('13426974546f7272656e742070726f746f636f6c(?P<reserved>\w{8})(?P<info_hash>\w{20})(?P<peer_id>\w{20})')
piece_request_tcpclose = re.compile('(?P<start>\w{12})5011')


class PieceRequestSniffer(Thread):
    def __init__(self, dev='eth0'):
        Thread.__init__(self)

        self.expr = 'udp or tcp'

        self.maxlen = 65535  # max size of packet to capture
        self.promiscuous = 1  # promiscuous mode?
        self.read_timeout = 100  # in milliseconds
        self.max_pkts = -1  # number of packets to capture; -1 => no limit

        self.active = True
        self.p = pcapy.open_live(dev, self.maxlen, self.promiscuous, self.read_timeout)
        self.p.setfilter(self.expr)

    @staticmethod
    def cb(hdr, data):

        eth = dpkt.ethernet.Ethernet(str(data))
        ip = eth.data

        #Select only TCP protocols
        if ip.p == dpkt.ip.IP_PROTO_TCP:
            tcp = ip.data

            #Select Ipv4 packets because of problem with the .p in Ipv6
            if ip.p == dpkt.ip6:
                return
            else:
                try:
                    #Return hexadecimal representation
                    hex_data = binascii.hexlify(tcp.data)
                except:
                    return                

                handshake = piece_request_handshake.findall(hex_data)
                if handshake:
                    print "-----------handsheck filtered-------------"
                    liste.append(handshake)
                    print "\n"
                    #for element in zip(liste,"123456789abcdefghijklmnopqrstuvwxyz"):
                    #    print(element)



    def stop(self):
        self.active = False

    def run(self):
        while self.active:
            self.p.dispatch(0, PieceRequestSniffer.cb)


sniffer = PieceRequestSniffer()
sniffer.start()

Answer 1

最后我找到了做到这一点的好方法，这条线不是：

if ip.p == dpkt.ip6:
                return

可是：

if eth.type == dpkt.ethernet.ETH_TYPE_IP6:
                    return

例外IP6没有属性

1 个答案: