Question

我有一个实验室，我需要为巨大的pcap文件的每个数据包找到协议。我将创建一个字典来保存它们，但我的第一步是使用dpkt来获取信息。看起来像我想要的ip.get_proto但我错过了一些观点。我正在阅读http://www.commercialventvac.com/dpkt.html#mozTocId839997

#!/usr/bin/python
# -*- coding: utf-8 -*-

import dpkt
import socket
import sys
import datetime

import matplotlib.pyplot as ploot 
import numpy as arrayNum 
from collections import Counter 

packets = 0 

protocolDist = {}  

f = open('bob.pcap')
#f = open('trace1.pcap')
pcap = dpkt.pcap.Reader(f) 

print "Maj Version:  " , dpkt.pcap.PCAP_VERSION_MAJOR  
print "Min Version:  " , dpkt.pcap.PCAP_VERSION_MINOR 
print "Link Layer "    , pcap.datalink() 
print "Snap Len:    "  , pcap.snaplen 

# How many packets does the trace contain? Count timestamps

# iterate through packets, we get a timestamp (ts) and packet data buffer (buf)
for ts,buf in pcap:
    packets += 1
    eth = dpkt.ethernet.Ethernet(buf)
    ip = eth.data
  # what is the timestamp of the first packet in the trace?
    if packets == 1:
        first = ts 
        print "The first timestamp is %f " % (first)    
        print ip.get_proto
        break 

# What is the average packet rate? (packets/second)     
# The last time stamp
last = ts
print "The last timestamp is %f " % (ts) 
print "The total time is %f " % (last - first)
print "There are %d " % (packets)
#print "The packets/second %f " % (packets/(last-first))    


# what is the protocol distribution?
# use dictionary 

f.close()
sys.exit(0)

Answer 1

检查ip.p 它返回与协议号对应的数字。例如，UDP有17。 ot chec

干杯

Answer 2

如果要获取IP协议号，可以使用

ip.get_proto(ip.p)

此帮助器功能将协议编号转换为协议类。检出https://www.iana.org/assignments/protocol-numbers/protocol-numbers.xhtml以获得IP协议的正式列表。有时以人类可读的格式获取表示很有用。我发现使用__name__来获取字符串很有用。

proto = ip.get_proto(ip.p).__name__
print(proto)
>>> 'TCP'

python dpkt pcap如何获得协议？

2 个答案: