在python的telnetlib中检测到关闭的连接 [英] Detect a closed connection in python's telnetlib

问题描述

我正在使用python的 telnetlib 连接到远程telnet服务器.我很难检测连接是否仍然打开，或者远程服务器是否关闭了我的连接.

I'm using python's telnetlib to connect to a remote telnet server. I'm having a hard time detecting if the connection is still open, or if the remote server closed it on me.

下一次尝试读取或写入连接时，我会注意到该连接已关闭，但希望有一种方法可以按需检测它.

I will notice the connection is closed the next time I try to read or write to it, but would like to have a way to detect it on demand.

有没有一种方法可以发送某种"Are You There"数据包而不影响实际连接? telnet RFC 支持您在那里"和"NOP"命令-只是不确定如何让telnetlib发送它们！

Is there a way to send some sort of an 'Are You There' packet without affecting the actual connection? The telnet RFC supports an "are you there" and "NOP" commands - just not sure how to get telnetlib to send them!

推荐答案

您应该可以通过这种方式发送NOP:

You should be able to send a NOP this way:

from telnetlib import IAC, NOP

... 

telnet_object.sock.sendall(IAC + NOP)

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