使用Dpkt解析包

#!/usr/bin/python
#coding=utf-8
import dpkt
import socket
import optparse

def printPcap(pcap):
    # 遍历[timestamp, packet]记录的数组
    for (ts, buf) in pcap:
        try:
            # 获取以太网部分数据
            eth = dpkt.ethernet.Ethernet(buf)
            # 获取IP层数据
            ip = eth.data
            # 把存储在inet_ntoa中的IP地址转换成一个字符串
            src = socket.inet_ntoa(ip.src)
            dst = socket.inet_ntoa(ip.dst)
            print '[+] 源地址: ' + src + ' --> 目标地址: ' + dst
        except:
            pass

def main():
    parser = optparse.OptionParser('[*] Usage : ./pcapTest.py -f ')
    parser.add_option('-f',dest='fileName',type='string',help='specify target filename')
    (options,args) = parser.parse_args()
    fileName = options.fileName

    if fileName == None:
        print parser.usage
        exit(0)
    else:
        #f = open('geotest.pcap')
        f = open(fileName)
        pcap = dpkt.pcap.Reader(f)
        printPcap(pcap)

if __name__ == '__main__':
    main()