paramiko_example.py

#!/usr/bin/python
#########################
# Proof of concept code #
#########################

import paramiko
import os
import sys
import time
sys.path.append(os.path.dirname(os.path.dirname(os.path.abspath(__file__))))
import socket
HOST_NAME = 'test.rebex.net'
USER_NAME = 'demo'
PASSWORD = 'password'

try:

    print 'Initializing the connection'
    client = paramiko.SSHClient()
    client.set_missing_host_key_policy(paramiko.AutoAddPolicy())
    client.connect(hostname=HOST_NAME, username=USER_NAME,
                   password=PASSWORD)
    print ('Connected to the server', HOST_NAME)

    commands = ['ls', 'ls -l', 'cd pub/example', 'pwd']
    print 'Executing commands on the server'
    for command in commands:
        print 'Executing command --> {}'.format(command)
        (stdin, stdout, stderr) = client.exec_command(command,
                timeout=10)
        ssh_output = stdout.read()
        ssh_error = stderr.read()
        if ssh_error:
            print 'Error occurred while running command:' + command \
                + ' The error is ' + ssh_error
            result_flag = False
        else:
            print ('Command execution completed successfully', command)
            print ('Output: ', ssh_output)

    print 'Downloading files from server'
    sftp_client = client.open_sftp()
    sftp_client.get('readme.txt', './readme_downloaded.txt')
    sftp_client.close()

    # This code might not work if we are uploading to example server

    sftp_client = client.open_sftp()
    sftp_client.put('./local_file.txt', 'remote_file.txt')
    sftp_client.close()

    client.close()
except paramiko.AuthenticationException:

    print 'Authentication failed, please verify your credentials'
except paramiko.SSHException, sshException:
    print 'Could not establish SSH connection: %s' % sshException
except socket.timeout, e:
    print 'Connection timed out'
except Exception, e:
    print ('Stack trace:\n', e)
    client.close()