python popen with ssh doesn't capture the output

Asked Apr 28 '20 at 04:49

Active Apr 28 '20 at 04:49

Viewed 178 times

I am trying to use popen to interact with ssh. But it seems like there is not way to redirect stdoutput

proc = subprocess.Popen(["/usr/bin/ssh","192.168.254.1", "user"], stdout=PIPE, stdin=PIPE, stderr=PIPE, shell=False, bufsize=10000)
out, err = proc.communicate()

When I run the script both the output and the err are empty, and the command line is showing

user@192.168.254.1's password:

what am I doing wrong? It has the exact same behavior when I set shell=True. Also before people tell me to use pexpect of the pxssh I have tried those, and they won't work for my application. I am running this script inside a daemon service and pexpect fundamentally handles the T100 and linux control codes/escape characters differently, and in certain reproducable instances looses part of the byte stream.

Any help is appreciated. Thank you

asked Apr 28 '20 at 04:49

noone392

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`ssh` reads the password from the terminal, not stdin. – Barmar Apr 28 '20 at 04:52
terminal as in directly from tty? – noone392 Apr 28 '20 at 05:07
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Yes, terminal == tty. – Barmar Apr 28 '20 at 05:07
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Does this answer your question? [Sending a password over SSH or SCP with subprocess.Popen](https://stackoverflow.com/questions/15166973/sending-a-password-over-ssh-or-scp-with-subprocess-popen) – Kenster Apr 28 '20 at 12:35
It does not, because I need to pragmatically get all the received text to analyze it. "user@192.168.254.1's password:" is a response provided by the remote target. – noone392 Apr 28 '20 at 14:04

python popen with ssh doesn't capture the output

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