community 
How to use 2 ssh sessions in a shell
Hi,
I am developing shells for our devices. Until now, I had only one ssh session and I used 'DefaultCommandMode' (package cloudshell.cli.command_mode). Now, I need to do 2 ssh sessions (ssh to a jumphost and then ssh to my device).
Please let me know how I can have 2 consecutive ssh sessions in my Shell. Can you please give some sample python file for this?
Thanks & Regards
Geetha
Hi Geetha,
I have added additional logging to cli_handler to see passwords.
Can you replace cli_handler in the driver from cli-handlerpy.zip and run the driver in Cloudshell.
I think this can help to see passwords which the driver sends. Then can you attach new logs?
Thanks.
Hi Geetha,
I have attached an example, in the example you can see the way how to use jump host as a command mode.
Let me know if that works for you?
Thanks.
Regards,
Yaroslav
Hi Yaroslav,
Thanks for your quick reply. When I execute the code I only get the first jumphost prompt, not the second 'device' prompt . Please see my file attached.
My result:
-sh-4.1$
Expecting to see my second prompt SWCMT0000202TS#
______________________________________________________________________________
My manual steps:
1. use Putty to ssh to 172.28.18.210 and login
2. I get the prompt -sh-4.1$
3. ssh to the device
-sh-4.1$ ssh autouser@172.28.17.251
autouser@172.28.17.251's password:
*******************************************************************************
Unauthorised access and use of the
* system may result in legal proceedings against you.
*******************************************************************************
* NOTE: Certain password procedures for complexity, reuse restrictions,
* and aging thresholds, including immediate change of passwords, enforced
* by your organization may prevent you from logging on to this system.
* You may need to change your password on the authentication system prior
* to logging in.
*******************************************************************************
no echo
>>>> All commands in script /usr/.profile were successful
SWCMT0000202TS#
4. SWCMT0000202TS# is my device prompt
Please advise. Thanks.
Regards
Geetha
Hi Geetha,
I have added minor fixes to your script, try it and let me know a result.
Thanks
Regards,
Yaroslav
Hi Yaroslav,
That worked when I execute the command_modes file by itself. Thanks :).
But, when I added the file command_modes.py to my driver project and execute, I get the following error: Please let me know why I get this error. I have attached my files.
Traceback (most recent call last):
File "E:\Apps\PyCharm Community Edition 2017.3.3\helpers\pydev\pydevd.py", line 1668, in
main()
File "E:\Apps\PyCharm Community Edition 2017.3.3\helpers\pydev\pydevd.py", line 1662, in main
globals = debugger.run(setup['file'], None, None, is_module)
File "E:\Apps\PyCharm Community Edition 2017.3.3\helpers\pydev\pydevd.py", line 1072, in run
pydev_imports.execfile(file, globals, locals) # execute the script
File "E:/SHELLS/HfcShell/src/run_hfc_driver.py", line 253, in
out = driver.get_inventory(context)
File "E:/SHELLS/HfcShell/src\driver.py", line 260, in get_inventory
response = autoload_operations.discover()
File "E:\SHELLS\lib\site-packages\cloudshell\devices\networking_utils.py", line 119, in wrapped
result = func(self, *args, **kwargs)
File "E:\SHELLS\lib\site-packages\cloudshell\devices\runners\autoload_runner.py", line 61, in discover
self.resource_config.name)
File "E:/SHELLS/HfcShell/src\hfc\flows\autoload_flow.py", line 15, in execute_flow
with self._cli_handler.default_mode_service() as cli_service:
File "E:\SHELLS\lib\site-packages\cloudshell\cli\session_pool_context_manager.py", line 43, in __enter__
prompts_re = r'|'.join(CommandModeHelper.defined_modes_by_prompt(self._command_mode).keys())
File "E:\SHELLS\lib\site-packages\cloudshell\cli\command_mode_helper.py", line 47, in defined_modes_by_prompt
while node.parent_node:
AttributeError: 'DefaultCommandMode' object has no attribute 'parent_node'
Regards
Geetha
Hi Geetha,
I have moved modes to cli_handler.py and changed service name in autoload_flow.py.
See changes.
Regards,
Yaroslav
Hi Yaroslav,
Initially I got an ssh error. But, after I swapped the ipaddress assignment it worked.
Thanks a lot for your help.
Regards
Geetha
Hi Yaroslav,
When the python project code is executed on pycharm, it works fine. But, when the code is used as a Shell in CloudShell to discover a Resource there is an error 'loop detected with the second part of the ssh:
Discovery failed for resource 'Hfc': 'get_inventory' command failed with 'SessionLoopDetectorException' error.
Description: ('SSHSession', 'Expected actions loops detected'). The resource is now excluded. To include the resource, navigate to the Inventory page.
I have attached the debug log from C:\ProgramData\QualiSystems\logs\inventory\HfcShell_3_107.
Note: The username and password work when tested manually or using pycharm.
Regards
Geetha
Hi Geetha,
In the attached debug log you can find cli session output. When it connects from the jump host to the device and enter password, device return ":Permission denied, please try again."
Looks like some credentials are not correct. When this repeats, LoopDetector catches this repetition and raises an exception.
Command: ssh autouser@172.28.17.251 ssh autouser@172.28.17.251 autouser@172.28.17.251's password: Action key: password: Permission denied, please try again. autouser@172.28.17.251's password: Action key: password: Permission denied, please try again.
Regards, Yaroslav
Hi Yaroslav,
Thanks for the reply. But, the credentials worked fine via pycharm :(.
I even tried another set of credentials which work on pycharm and I get the following error. The credentials are correct. Any other ideas?
2019-03-01 16:47:19,500 [ERROR]: QS.hfc.Thread-92 ssh_session - _initialize_session Traceback (most recent call last): 2019-03-01 16:47:19,500 [ERROR]: QS.hfc.Thread-92 ssh_session - _initialize_session File "C:\ProgramData\QualiSystems\venv\HfcShell_4_107\lib\site-packages\cloudshell\cli\session\ssh_session.py", line 63, in _initialize_session 2019-03-01 16:47:19,500 [ERROR]: QS.hfc.Thread-92 ssh_session - _initialize_session banner_timeout=30, allow_agent=True, look_for_keys=False, pkey=self.pkey) 2019-03-01 16:47:19,500 [ERROR]: QS.hfc.Thread-92 ssh_session - _initialize_session File "C:\ProgramData\QualiSystems\venv\HfcShell_4_107\lib\site-packages\paramiko\client.py", line 424, in connect 2019-03-01 16:47:19,500 [ERROR]: QS.hfc.Thread-92 ssh_session - _initialize_session passphrase, 2019-03-01 16:47:19,500 [ERROR]: QS.hfc.Thread-92 ssh_session - _initialize_session File "C:\ProgramData\QualiSystems\venv\HfcShell_4_107\lib\site-packages\paramiko\client.py", line 714, in _auth 2019-03-01 16:47:19,500 [ERROR]: QS.hfc.Thread-92 ssh_session - _initialize_session raise saved_exception 2019-03-01 16:47:19,500 [ERROR]: QS.hfc.Thread-92 ssh_session - _initialize_session AuthenticationException: Authentication failed. 2019-03-01 16:47:19,500 [ERROR]: QS.hfc.Thread-92 ssh_session - _initialize_session 2019-03-01 16:47:20,621 [INFO]: QS.hfc.Thread-92 networking_utils - wrapped Command "discover" finished unsuccessfully
Regards
Geetha
