cannot use telnet module if a banner is applied within one of 'prompts' characters

[zetto33]

SUMMARY

Issues faced case a banner is applied (on device that host telnet services) with one of those characters: '[>|#]'

ISSUE TYPE

In case one of those characters are applied on device that host telnet service banner '>|#' the output will be applied as something like: changed: [R3] => { "changed": true, "output": [ "#", "#", "#" ] }

COMPONENT NAME

ansible.netcommon.telnet

ANSIBLE VERSION

ansible 2.9.15 ansible-playbook 2.9.15

CONFIGURATION

HOST_KEY_CHECKING(/etc/ansible/ansible.cfg) = False

OS / ENVIRONMENT

CentOS Linux release 8.2.2004 (Core) Running on Virtualbox 6.1.14 r140239 (Qt5.6.2) inside Microsoft Windows [Version 10.0.19042.572]

STEPS TO REPRODUCE

Create YAML files (see below), and run command: ansible-playbook -i /etc/ansible/inventory_telnet.yml /etc/ansible/commands.yml. Make sure device that has telnet service enabled has banner (for Cisco device: either 'banner motd', or 'banner login' enabled) with once of strings '>|#' characters. E.G. ########## Welcome ##########

inventory_telnet.yml
=========
telnet:
  hosts:
    R1:
      ansible_host: "R3"
---------------
commands.yml
==========
- name: show version
  hosts: telnet
  gather_facts: false
  connection: local
  tasks:
    - name: telnet sw
      telnet:
        user: cisco
        password: cisco
        login_prompt: "Username: "
        prompts:
          - '[>|#]'
        command:
          - terminal length 0
          - sh run

EXPECTED RESULTS

I expect that script can also support device hostname, something like (...) prompts: - '$hostname[>|#]' (...)

ACTUAL RESULTS

# ansible-playbook -i /etc/ansible/inventory_telnet.yml /etc/ansible/commands.yml -vvvv
ansible-playbook 2.9.15
  config file = /etc/ansible/ansible.cfg
  configured module search path = ['/root/.ansible/plugins/modules', '/usr/share/ansible/plugins/modules']
  ansible python module location = /usr/lib/python3.6/site-packages/ansible
  executable location = /usr/bin/ansible-playbook
  python version = 3.6.8 (default, Apr 16 2020, 01:36:27) [GCC 8.3.1 20191121 (Red Hat 8.3.1-5)]
Using /etc/ansible/ansible.cfg as config file
setting up inventory plugins
host_list declined parsing /etc/ansible/inventory_telnet.yml as it did not pass its verify_file() method
script declined parsing /etc/ansible/inventory_telnet.yml as it did not pass its verify_file() method
Parsed /etc/ansible/inventory_telnet.yml inventory source with yaml plugin
Loading callback plugin default of type stdout, v2.0 from /usr/lib/python3.6/site-packages/ansible/plugins/callback/default.py

PLAYBOOK: commands.yml ************************************************************************************************************
Positional arguments: /etc/ansible/commands.yml
verbosity: 4
connection: smart
timeout: 10
become_method: sudo
tags: ('all',)
inventory: ('/etc/ansible/inventory_telnet.yml',)
forks: 5
1 plays in /etc/ansible/commands.yml

PLAY [show version] ***************************************************************************************************************
META: ran handlers

TASK [telnet sw] ******************************************************************************************************************
task path: /etc/ansible/commands.yml:6
changed: [R3] => {
    "changed": true,
    "output": [
        "#",
        "#",
        "#"
    ]
}
META: ran handlers
META: ran handlers

PLAY RECAP ************************************************************************************************************************
R3                         : ok=1    changed=1    unreachable=0    failed=0    skipped=0    rescued=0    ignored=0

#