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因为工作需要，需要分析wirshark的抓包数据。数据有的是在比特位中。不方便查找。而lua语言又不愿意去学，所以用python解析后，输出日志。帮助分析.

1.tcp分析

from dpkt.tcp import TCP
from scapy.all import *
from datetime import datetime, timedelta
import pytz
import datetime
from datetime import datetimedef main(file_path,tcp_ip,tcp_port):pkts = rdpcap(file_path)for pkt in pkts:if IP in pkt and TCP in pkt:if pkt[IP].dst == tcp_ip and pkt[TCP].dport == tcp_port:# if pkt[IP].dst == "225.0.0.10" and pkt[TCP].dport == 12306 and len(pkt) == 25:if len(pkt.load) == 18:print("*" * 50)print("Time: ", datetime.fromtimestamp(pkt.time), "Second byte: ", pkt[Raw].load[2])main('E:\\abs\\shak\\1.pcapng', "225.0.0.10", 12306)

2.udp分析

from dpkt.ip import IP
from dpkt.udp import UDP
from scapy.all import *
import datetime
from datetime import datetimedef main(file_path,udp_ip,udp_port):pkts = rdpcap(file_path)for pkt in pkts:if IP in pkt and UDP in pkt:if pkt[IP].dst == udp_ip and pkt[UDP].dport == udp_port:if len(pkt.load) == 18:print("*"*50)print("Time: ", datetime.fromtimestamp(pkt.time),"Second byte: ", pkt[Raw].load[2])if pkt[Raw].load[9] == 0x0a:print("*" * 50)# 打印完整的全部数据#print("Time: ", datetime.fromtimestamp(pkt.time),pkt.show())#只打印对应的数据包print("Time: ", datetime.fromtimestamp(pkt.time),pkt.load)
main('E:\\abs\\shak\\1.pcapng',"225.0.0.10",12306)

3.根据比特位取值，保存

from dpkt.ip import IP
from dpkt.udp import UDP
from scapy.all import *
import datetime
from datetime import datetimedef main(file_path,udp_ip,udp_port):pkts = rdpcap(file_path)with open("E:\\abs\\shak\\output.txt", "w") as f:for pkt in pkts:# 过滤ipif IP in pkt and UDP in pkt and pkt[IP].dst == udp_ip and pkt[UDP].dport == udp_port:# 过滤长度if len(pkt.load) == 18:#过滤功能码，同时可以计算某个字节的比特位if pkt[Raw].load[9] == 0x0a:bit_one = (pkt[Raw].load[10] >> 1) & 0x01bit_two = (pkt[Raw].load[10] >> 2) & 0x01bit_three = (pkt[Raw].load[10] >> 3) & 0x01bit_four = (pkt[Raw].load[10] >> 4) & 0x01bit_five = (pkt[Raw].load[10] >> 5) & 0x01bit_six = (pkt[Raw].load[10] >> 6) & 0x01bit_seven = (pkt[Raw].load[10] >> 7) & 0x01data = "Time:" + "\t" + str(datetime.fromtimestamp(pkt.time)) + "\t" + "data:" + str(bit_one)\+" "+str(bit_two)+" "+str(bit_three)+" "+str(bit_four)+" "+str(bit_five)+" "+str(bit_six)\+" "+str(bit_seven)+ "\n"f.write(data)#print("Time: ", datetime.fromtimestamp(pkt.time),pkt.show())print("Time: ", datetime.fromtimestamp(pkt.time),pkt.load)data1 = "Time:"+"\t" +str(datetime.fromtimestamp(pkt.time))+"\t"+"data:"+str(pkt.load)+"\n"f.write(data1)