使用python套接字获取udp数据包的流量类

Question

我想使用python套接字检索udp数据包的流量类（TOS）。以下代码在python中生成套接字，并且我想要检索类似于（java套接字中的getTrafficClass方法）的流量类。

UDP_IP = '127.0.0.1' 
 
UDP_PORT = 8080 
 
BUFFER_SIZE = 20 
 

 
s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM) 
 

 
s.bind((UDP_IP, UDP_PORT)) 
 
data, address = s.recvfrom(BUFFER_SIZE) 
 
if data: 
 
    print "received data:", data 
 
    //I need to get the traffic class here.

Answer 1

我认为象Java getTrafficClass()没有现成的方法。可以读取IP层报头（一个UDP层标题下方），并分析它，例如代码在Sniffy.pyhttps://github.com/OffensivePython/Sniffy/blob/master/Sniffy.py或https://codingsec.net/2016/05/decoding-ip-layer-python/

[...] 
def sniff(sock): 
""" sniff a packet, parse its header and dump the sniffed data """ 
packet, address = sock.recvfrom(65565) 
ipheader=ip(packet[:20]) 
ipheader.parse() 
[...]