原始套接字编程UDP Python [英] Raw Socket Programming UDP Python
本文介绍了原始套接字编程UDP Python的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
如何以SOCK_RAW格式在python中添加IP和UDP标头之类的自定义字段?我想在数据包中有一个自定义字段并在计算中使用该字段.
How can I add custom fields like IP and UDP headers in python in the SOCK_RAW format?I want to have a custom field in the packet and use that field in computation.
推荐答案
您未指定要在何处使用该自定义字段.此示例使您可以随意构建UDP标头(至少在Linux上-可能存在与操作系统有关的行为):
You didn't specify where you want that custom field. This example lets you build the UDP header at will (at least on Linux - there might be OS-dependent behaviour):
from socket import *
import struct
s = socket(AF_INET, SOCK_RAW, IPPROTO_UDP)
data = 'string'
sport = 4711 # arbitrary source port
dport = 45134 # arbitrary destination port
length = 8+len(data);
checksum = 0
udp_header = struct.pack('!HHHH', sport, dport, length, checksum)
s.sendto(udp_header+data, ('', 0));
经过测试:
# socat -u UDP:localhost:4711 - &
# netstat -up
Active Internet connections (w/o servers)
Proto Recv-Q Send-Q Local Address Foreign Address State PID/Program name
udp 0 0 localhost:45134 localhost:4711 ESTABLISHED 2663/socat
# tcpdump -ilo -vv -x
11:32:07.409163 IP (tos 0x0, ttl 64, id 0, offset 0, flags [DF], proto UDP (17), length 34)
localhost.4711 > localhost.45134: [no cksum] UDP, length 6
0x0000: 4500 0022 0000 4000 4011 3cc9 7f00 0001
0x0010: 7f00 0001 1267 b04e 000e 0000 7374 7269
0x0020: 6e67
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