CODEWITHSUNDEEP
pythonssh
InnisBrendan
InnisBrendan

Reputation: 2249

Open SSH connection on exit Python

I am writing a little script which picks the best machine out of a few dozen to connect to. It gets a users name and password, and then picks the best machine and gets a hostname. Right now all the script does is print the hostname. What I want is for the script to find a good machine, and open an ssh connection to it with the users provided credentials.

So my question is how do I get the script to open the connection when it exits, so that when the user runs the script, it ends with an open ssh connection.

I am using sshpass.

Upvotes: 1

Views: 1439

Answers (3)

Brian Dickman
Brian Dickman

Reputation: 11

You can use the os.exec* function to replace the Python process with the callee:

import os
os.execl("/usr/bin/ssh", "user@host", ...)

https://docs.python.org/2/library/os.html#os.execl

Upvotes: 1

Jed Estep
Jed Estep

Reputation: 605

If you want the python script to exit, I think your best bet would be to continue doing a similar thing to what you're doing; print the credentials in the form of arguments to the ssh command and run python myscript.py | xargs ssh. As tdelaney pointed out, though, subprocess.call(['ssh', args]) will let you run the ssh shell as a child of your python process, causing python to exit when the connection is closed.

Upvotes: 0

Juca
Juca

Reputation: 489

a little hackish, but works:

#!/usr/bin/env python3
#-*- coding: utf-8 -*-

import subprocess

username = input('username: ')

cmd = ['ssh', '-oStrictHostKeyChecking=no', '%s@server.net' % username,]
subprocess.call(cmd)

In this example I'm not using sshpass, but the idea with sshpass is the same as using ssh. Use subprocess.call to call the ssh part.

EDIT: Now I realized you want to exit the python process first. In my answer the process dies when the ssh connection is gone.

Upvotes: 0

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