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I'm trying to run an interactive command through paramiko. The cmd execution tries to prompt for a password but I do not know how to supply the password through paramiko's exec_command and the execution hangs. Is there a way to send values to the terminal if a cmd execution expects input interactively?
ssh = paramiko.SSHClient() ssh.connect(server, username=username, password=password) ssh_stdin, ssh_stdout, ssh_stderr = ssh.exec_command("psql -U factory -d factory -f /tmp/data.sql") Does anyone know how this can addressed? Thank you.
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SSHClient. A high-level representation of a session with an SSH server. This class wraps Transport , Channel , and SFTPClient to take care of most aspects of authenticating and opening channels. A typical use case is: client = SSHClient() client.
Paramiko helps you automate repetitive system administration tasks on remote servers. More advanced Paramiko programs send the lines of a script one at a time. It does this rather than transacting all of a command, such as df or last , synchronously to completion.
Using exec_command() in Paramiko returns a tuple (stdin, stdout, stderr) . Most of the time, you just want to read stdout and ignore stdin and stderr . You can get the output the command by using stdout. read() (returns a string) or stdout.
Paramiko (Python Module) works on SSHv2 protocol. It provides both client and server functionality. Paramiko module can be used if SSH server is running on the target machine. Target machine can be Linux or Windows system.
The full paramiko distribution ships with a lot of good demos.
In the demos subdirectory, demo.py and interactive.py have full interactive TTY examples which would probably be overkill for your situation.
In your example above ssh_stdin acts like a standard Python file object, so ssh_stdin.write should work so long as the channel is still open.
I've never needed to write to stdin, but the docs suggest that a channel is closed as soon as a command exits, so using the standard stdin.write method to send a password up probably won't work. There are lower level paramiko commands on the channel itself that give you more control - see how the SSHClient.exec_command method is implemented for all the gory details.
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I had the same problem trying to make an interactive ssh session using ssh, a fork of Paramiko.
I dug around and found this article:
Updated link (last version before the link generated a 404): http://web.archive.org/web/20170912043432/http://jessenoller.com/2009/02/05/ssh-programming-with-paramiko-completely-different/
To continue your example you could do
ssh_stdin, ssh_stdout, ssh_stderr = ssh.exec_command("psql -U factory -d factory -f /tmp/data.sql") ssh_stdin.write('password\n') ssh_stdin.flush() output = ssh_stdout.read() The article goes more in depth, describing a fully interactive shell around exec_command. I found this a lot easier to use than the examples in the source.
Original link: http://jessenoller.com/2009/02/05/ssh-programming-with-paramiko-completely-different/
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