open a putty window and run ssh commands - Python

Question

I am new to python. I need to login to a server daily (Desktop -> 1.32 -> 0.20 -> 3.26). For this I need to open putty and using ssh connection i am logging in. To do all this I want to write a script using python.

By using google I thought subprocess.Popen will do that. But Its not working fine.

1st trail:

import subprocess
pid = subprocess.Popen("putty.exe [email protected] -pw password").pid

Its working fine (Opening window logging into .32). But cant able to give input. I came to know that to give input for the same process we need to use pipes.

2nd trail:

from subprocess import Popen, PIPE, STDOUT
p = Popen("putty.exe [email protected] -pw password", stdout=PIPE, stdin=PIPE, stderr=STDOUT)    
grep_stdout = p.communicate(input=b'ssh xx.xx.x.20\n')[0]
print(grep_stdout.decode())

by using this i cant login for the first server also. After logging in to all servers I need the terminal as alive. how to do this???

Edit

I need to do this in a new putty window. After logging in dont close the window. I have some manual work to do.

wombatonfire · Accepted Answer · 2016-05-07 20:21:42Z

2

There is a SSHv2 protocol implementation for python: http://www.paramiko.org/. You can easily install it with pip:

pip install paramiko

Then you can create ssh client, connect to your host and execute commands:

import paramiko
ssh_client = paramiko.SSHClient()
ssh_client.set_missing_host_key_policy(paramiko.AutoAddPolicy())
ssh_client.connect('hostname', username='login', password='pwd')
stdin, stdout, stderr = ssh_client.exec_command('command')

answered May 7, 2016 at 20:21

wombatonfire

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Tanu · Accepted Answer · 2016-05-07 21:38:28Z

2

Use paramiko library python Establish a SSH connection using -

ssh = paramiko.SSHClient()
ssh.set_missing_host_key_policy(paramiko.AutoAddPolicy())
ssh.connect(hostname,username, password)

Check the status if connection is alive using -

status =  ssh.get_transport().is_active()
#returns True if connection is alive/active

ssh.exec_command() is basically a single session. Use exec_command(command1;command2) to execute multiple commands in one session

Also, you can use this to execute multiple commands in single session

channel = ssh.invoke_shell()
stdin = channel.makefile('wb')
stdout = channel.makefile('rb')
stdin.write('''
  Command 1
  Command 2
  ''')

print stdout.read()

answered May 7, 2016 at 21:38

Tanu

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1 Comment

Swapna murahari Over a year ago

I need to pop a new window (putty) and have to login. After login is complete to all server (Desktop -> 1.32 -> 0.20 -> 3.26) don't close the putty window (I have some manual work to check).

Mark · Accepted Answer · 2019-07-03 18:49:05Z

2

use powershell to call putty in order to open a new window

from subprocess import Popen
Popen("powershell putty.exe user@host -pw mypassword")

answered Jul 3, 2019 at 18:49

Mark

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user3178410 · Accepted Answer · 2021-02-15 07:12:43Z

I created a bat file on windows, which references putty and putty session-specific info. This bat file can run by itself on windows. To call from python, I used the subprocess.run() -- python 3.5+.

Example of bat file named putty.bat:

start c:\app\PuTTy\putty.exe -load 192.168.1.230-node1-logs -l <logon user> -pw <logon user password for putty session>

Breaking down the bat file:

It begins with window's command "start".
c:\app\PuTTy\putty.exe --> is the putty directory on Windows containing putty.exe.
-load --> tells putty to load a putty profile. The profile is the name you see on the putty client, under "Saved Sessions".
192.168.1.230-node1-logs --> my putty session specific profile.
-l for logon --> followed by the putty logon user.
-pw is the logon password --> followed by the putty logon password. That concludes the contents of "putty.bat".

From within python, is used the subprocess.run() command.

Example:

import subprocess
...
...
                try:

                    process = subprocess.run(["putty.bat"], check=True, stdout=subprocess.PIPE, universal_newlines=True)

                    print(process.stdout)

                except Exception as e:

                    print("subprocess call error in open putty command")
                    
                    print(str(e))

I hope you find this helpful

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