#!/usr/bin/env python

# Copyright (C) 2003-2007  Robey Pointer <robeypointer@gmail.com>
#
# This file is part of paramiko.
#
# Paramiko is free software; you can redistribute it and/or modify it under the
# terms of the GNU Lesser General Public License as published by the Free
# Software Foundation; either version 2.1 of the License, or (at your option)
# any later version.
#
# Paramiko is distributed in the hope that it will be useful, but WITHOUT ANY
# WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
# A PARTICULAR PURPOSE.  See the GNU Lesser General Public License for more
# details.
#
# You should have received a copy of the GNU Lesser General Public License
# along with Paramiko; if not, write to the Free Software Foundation, Inc.,
# 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA.


import base64
import getpass
import os
import socket
import sys
import traceback
from paramiko.py3compat import input

import paramiko
try:
    import interactive
except ImportError:
    from . import interactive


# setup logging
paramiko.util.log_to_file('demo_simple.log')
# Paramiko client configuration
UseGSSAPI = True             # enable GSS-API / SSPI authentication
DoGSSAPIKeyExchange = True
port = 22

# get hostname
username = ''
if len(sys.argv) > 1:
    hostname = sys.argv[1]
    if hostname.find('@') >= 0:
        username, hostname = hostname.split('@')
else:
    hostname = input('Hostname: ')
if len(hostname) == 0:
    print('*** Hostname required.')
    sys.exit(1)

if hostname.find(':') >= 0:
    hostname, portstr = hostname.split(':')
    port = int(portstr)


# get username
if username == '':
    default_username = getpass.getuser()
    username = input('Username [%s]: ' % default_username)
    if len(username) == 0:
        username = default_username
if not UseGSSAPI or (not UseGSSAPI and not DoGSSAPIKeyExchange):
    password = getpass.getpass('Password for %s@%s: ' % (username, hostname))


# now, connect and use paramiko Client to negotiate SSH2 across the connection
try:
    client = paramiko.SSHClient()
    client.load_system_host_keys()
    client.set_missing_host_key_policy(paramiko.WarningPolicy())
    print('*** Connecting...')
    if not UseGSSAPI or (not UseGSSAPI and not DoGSSAPIKeyExchange):
        client.connect(hostname, port, username, password)
    else:
        # SSPI works only with the FQDN of the target host
        hostname = socket.getfqdn(hostname)
        try:
            client.connect(hostname, port, username, gss_auth=UseGSSAPI,
                           gss_kex=DoGSSAPIKeyExchange)
        except Exception:
            password = getpass.getpass('Password for %s@%s: ' % (username, hostname))
            client.connect(hostname, port, username, password)

    chan = client.invoke_shell()
    print(repr(client.get_transport()))
    print('*** Here we go!\n')
    interactive.interactive_shell(chan)
    chan.close()
    client.close()

except Exception as e:
    print('*** Caught exception: %s: %s' % (e.__class__, e))
    traceback.print_exc()
    try:
        client.close()
    except:
        pass
    sys.exit(1)