在Python中获取传入UDP数据包的TTL [英] Getting TTL of incoming UDP packet in Python

问题描述

我正在使用Python中的套接字模块进行一些基本的UDP客户端 - 服务器通信。我需要做的很简单：客户端向服务器发送数据包，服务器用客户端的公共IP地址，端口和代表UDP数据包到达服务器时的TTL的数字进行回答。这是我的主要问题：有没有办法用recvfrom（）左右接收数据包，并读取它到达我的服务器时的TTL值？

I'm using the socket module in Python to do some basic UDP client-server communication. What I would need to do is quite simple: client sends server a packet, server answers with client's public ip address, port and a number representing the TTL the UDP packet had when it got to the server. This is my main problem: is there any way to recieve a packet with recvfrom() or so, and read the TTL value it had when it reached my server?

谢谢你非常喜欢！

Matteo Monti

Matteo Monti

推荐答案

我想你想要的到setsockopt（IP_RECVTTL），然后使用recvmsg（）。但是Python似乎没有在其标准库中使用recvmsg（参见 http://bugs.python.org/issue6560 ）。因此，您可能需要编写一个可由Python导入的小型C或C ++共享库，它可以满足您的需求。或者尝试使用第一页链接的补丁。

I think you want to setsockopt(IP_RECVTTL) and then use recvmsg(). But Python doesn't seem to have recvmsg in its standard libraries (see http://bugs.python.org/issue6560). So probably you will need to write a small C or C++ shared library which is importable by Python and which does what you want. Or maybe try using the patches from page I linked.

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