mirror of
https://github.com/ansible-collections/community.general.git
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2a9fd7359f
* Add more license statements. These were modified manually incorporating existing data. * Remove accidentally added line.
96 lines
2.8 KiB
Python
96 lines
2.8 KiB
Python
# -*- coding: utf-8 -*-
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# Copyright (c) 2020 Ansible Project
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# GNU General Public License v3.0+ (see LICENSES/GPL-3.0-or-later.txt or https://www.gnu.org/licenses/gpl-3.0.txt)
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# SPDX-License-Identifier: GPL-3.0-or-later
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# Make coding more python3-ish
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from __future__ import (absolute_import, division, print_function)
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__metaclass__ = type
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DOCUMENTATION = '''
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name: random_mac
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short_description: Generate a random MAC address
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description:
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- Generates random networking interfaces MAC addresses for a given prefix.
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options:
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_input:
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description: A string prefix to use as a basis for the random MAC generated.
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type: string
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required: true
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seed:
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description:
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- A randomization seed to initialize the process, used to get repeatable results.
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- If no seed is provided, a system random source such as C(/dev/urandom) is used.
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required: false
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type: string
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'''
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EXAMPLES = '''
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- name: Random MAC given a prefix
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ansible.builtin.debug:
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msg: "{{ '52:54:00' | community.general.random_mac }}"
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# => '52:54:00:ef:1c:03'
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- name: With a seed
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ansible.builtin.debug:
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msg: "{{ '52:54:00' | community.general.random_mac(seed=inventory_hostname) }}"
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'''
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RETURN = '''
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_value:
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description: The generated MAC.
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type: string
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'''
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import re
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from random import Random, SystemRandom
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from ansible.errors import AnsibleFilterError
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from ansible.module_utils.six import string_types
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def random_mac(value, seed=None):
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''' takes string prefix, and return it completed with random bytes
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to get a complete 6 bytes MAC address '''
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if not isinstance(value, string_types):
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raise AnsibleFilterError('Invalid value type (%s) for random_mac (%s)' %
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(type(value), value))
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value = value.lower()
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mac_items = value.split(':')
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if len(mac_items) > 5:
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raise AnsibleFilterError('Invalid value (%s) for random_mac: 5 colon(:) separated'
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' items max' % value)
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err = ""
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for mac in mac_items:
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if not mac:
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err += ",empty item"
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continue
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if not re.match('[a-f0-9]{2}', mac):
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err += ",%s not hexa byte" % mac
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err = err.strip(',')
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if err:
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raise AnsibleFilterError('Invalid value (%s) for random_mac: %s' % (value, err))
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if seed is None:
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r = SystemRandom()
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else:
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r = Random(seed)
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# Generate random int between x1000000000 and xFFFFFFFFFF
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v = r.randint(68719476736, 1099511627775)
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# Select first n chars to complement input prefix
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remain = 2 * (6 - len(mac_items))
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rnd = ('%x' % v)[:remain]
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return value + re.sub(r'(..)', r':\1', rnd)
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class FilterModule:
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''' Ansible jinja2 filters '''
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def filters(self):
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return {
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'random_mac': random_mac,
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}
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