CODEWITHSUNDEEP
pythonparamiko
Tinniam V. Ganesh
Tinniam V. Ganesh

Reputation: 2079

No response in ssh.exec_command in paramiko

I am trying to use Python paramiko to execute commands on a remote server. When I run the following commands I get the prompt back and it appears to have succeeded as I get the prompt back

>>> import paramiko
>>> ssh = paramiko.SSHClient()
>>> ssh.set_missing_host_key_policy(paramiko.AutoAddPolicy())
>>> ssh.connect('a.b.c.d', username='server', password='xyz')
>>>

The only response I get when I try to execute a command is []

>>> stdin, stdout, stderr = ssh.exec_command("host")
>>> stdout.readlines()
[]

Almost any command gives this same output. The command "host" when ssh is executed from the shell gives several lines of Usage output

I get this error if I don't give password

>>> ssh.connect('a.b.c.d', username='server')
Traceback (most recent call last):
 File "<stdin>", line 1, in <module>
 File "build\bdist.win32\egg\paramiko\client.py", line 307, in connect
 File "build\bdist.win32\egg\paramiko\client.py", line 520, in _auth
 paramiko.ssh_exception.SSHException: No authentication methods available

I don't know if the SSH connection is through and why commands are not being executed.

Should something be added for authentication? Am I missing something?

Upvotes: 1

Views: 2390

Answers (1)

Tim S.
Tim S.

Reputation: 2257

The reason you get no output in stdout, is because running "host" with no options (as you said) provides the usage. If you type "echo $?" immediately afterward, you'll see a "1" instead of a zero. This is the indicator that the usage actually writes to stderr, not stdout.

Try executing a command that will always return output to stdout, like "ls -l". This should resolve your issue.

Edit: Or print the contents of stderr, that should work too, although it's not terribly useful. I forgot to mention -- I know this is an old thread, but someone might still have this problem in the future.

Upvotes: 1

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