python 抓包保存为pcap文件并解析的实例

import osfrom scapy.all import * pkts=[]count=0pcapnum=0filename='' 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

# -*- coding: cp936 -*-import reimport zlibimport os from scapy.all import *num=1a=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 atry:  #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:        passexcept:  print "[*]no pcapfile..."