python 抓包保存为pcap文件并解析的实例
首先是抓包,使用scapy模块,
sniff()函数 在其中参数为本地文件路径时,操作为打开本地文件
若参数为BPF过滤规则和回调函数,则进行Sniff,回调函数用于对Sniff到的数据包进行处理
import os from scapy.all import * pkts=[] count=0 pcapnum=0 filename='' def test_dump_file(dump_file): print "Testing the dump file..." if os.path.exists(dump_file): print "dump fie %s found." %dump_file pkts=sniff(offline=dump_file) count = 0 while (count<=2): print "----Dumping pkt:%s----" %dump_file print hexdump(pkts[count]) count +=1 else: print "dump fie %s not found." %dump_file def write_cap(x): global pkts global count global pcapnum global filename pkts.append(x) count +=1 if count ==3: <span style="font-family: Arial, Helvetica, sans-serif;">#每3个TCP操作封为一个包(为了检测正确性,使用时尽量增多)</span> pcapnum +=1 pname="pcap%d.pcap"%pcapnum wrpcap(pname,pkts) filename ="./pcap%d.pcap"%pcapnum test_dump_file(filename) pkts=[] count=0 if __name__=='__main__': print "Start packet capturing and dumping ..." sniff(filter="dst net 127.0.0.1 and tcp",prn=write_cap) #BPF过滤规则
下面是对pcap文件的解析,会自动查找下一个pcap文件,按照src.ip和dst.ip进行划分
# -*- coding: cp936 -*- import re import zlib import os from scapy.all import * num=1 a=rdpcap("pcap1.pcap") #循环打开文件 while True: try: num+=1 file_name="pcap%d.pcap" % num b=rdpcap(file_name) a=a+b except: break print "[*] Read pcap file ok" print "[*] Begin to parse pcapfile..." print a try: #print "[*] OPen new pcap_file %s" % pcap_file sessions=a.sessions() for session in sessions: print "[*]New session %s" % session data_payload="" for packet in sessions[session]: try: data_payload +=str(packet[TCP].payload) print "[**] Data:%s" % data_payload except: pass except: print "[*]no pcapfile..."
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