mirror of https://github.com/ansible/ansible.git
Move network utils that are used by AWS modules (#45579)
* Separate networking tools that may be used by modules outside of networking so changes to networking-only utilities don't trigger AWS integration tests * Add unit tests for moved network utils * Add comment to prevent imports from being mistakenly removed * Move to_bits as wellpull/46416/head
Sloane Hertel
6 years ago
committed by
ansibot
parent
a1fae193c7
commit
27534e9b47
@ -0,0 +1,115 @@
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# Copyright (c) 2016 Red Hat Inc
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# Simplified BSD License (see licenses/simplified_bsd.txt or https://opensource.org/licenses/BSD-2-Clause)
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# General networking tools that may be used by all modules
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from struct import pack
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from socket import inet_ntoa
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from ansible.module_utils.six.moves import zip
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VALID_MASKS = [2**8 - 2**i for i in range(0, 9)]
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def is_netmask(val):
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parts = str(val).split('.')
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if not len(parts) == 4:
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return False
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for part in parts:
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try:
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if int(part) not in VALID_MASKS:
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raise ValueError
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except ValueError:
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return False
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return True
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def is_masklen(val):
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try:
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return 0 <= int(val) <= 32
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except ValueError:
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return False
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def to_netmask(val):
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""" converts a masklen to a netmask """
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if not is_masklen(val):
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raise ValueError('invalid value for masklen')
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bits = 0
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for i in range(32 - int(val), 32):
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bits |= (1 << i)
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return inet_ntoa(pack('>I', bits))
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def to_masklen(val):
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""" converts a netmask to a masklen """
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if not is_netmask(val):
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raise ValueError('invalid value for netmask: %s' % val)
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bits = list()
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for x in val.split('.'):
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octet = bin(int(x)).count('1')
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bits.append(octet)
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return sum(bits)
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def to_subnet(addr, mask, dotted_notation=False):
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""" coverts an addr / mask pair to a subnet in cidr notation """
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try:
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if not is_masklen(mask):
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raise ValueError
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cidr = int(mask)
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mask = to_netmask(mask)
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except ValueError:
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cidr = to_masklen(mask)
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addr = addr.split('.')
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mask = mask.split('.')
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network = list()
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for s_addr, s_mask in zip(addr, mask):
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network.append(str(int(s_addr) & int(s_mask)))
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if dotted_notation:
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return '%s %s' % ('.'.join(network), to_netmask(cidr))
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return '%s/%s' % ('.'.join(network), cidr)
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def to_ipv6_network(addr):
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""" IPv6 addresses are eight groupings. The first three groupings (48 bits) comprise the network address. """
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# Split by :: to identify omitted zeros
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ipv6_prefix = addr.split('::')[0]
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# Get the first three groups, or as many as are found + ::
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found_groups = []
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for group in ipv6_prefix.split(':'):
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found_groups.append(group)
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if len(found_groups) == 3:
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break
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if len(found_groups) < 3:
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found_groups.append('::')
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# Concatenate network address parts
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network_addr = ''
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for group in found_groups:
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if group != '::':
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network_addr += str(group)
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network_addr += str(':')
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# Ensure network address ends with ::
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if not network_addr.endswith('::'):
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network_addr += str(':')
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return network_addr
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def to_bits(val):
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""" converts a netmask to bits """
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bits = ''
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for octet in val.split('.'):
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bits += bin(int(octet))[2:].zfill(8)
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return str
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@ -0,0 +1,68 @@
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# -*- coding: utf-8 -*-
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# (c) 2017 Red Hat, Inc.
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# GNU General Public License v3.0+ (see COPYING or https://www.gnu.org/licenses/gpl-3.0.txt)
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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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import pytest
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from ansible.module_utils.common.network import (
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to_masklen,
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to_netmask,
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to_subnet,
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to_ipv6_network,
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is_masklen,
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is_netmask
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)
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def test_to_masklen():
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assert 24 == to_masklen('255.255.255.0')
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def test_to_masklen_invalid():
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with pytest.raises(ValueError):
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to_masklen('255')
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def test_to_netmask():
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assert '255.0.0.0' == to_netmask(8)
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assert '255.0.0.0' == to_netmask('8')
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def test_to_netmask_invalid():
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with pytest.raises(ValueError):
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to_netmask(128)
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def test_to_subnet():
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result = to_subnet('192.168.1.1', 24)
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assert '192.168.1.0/24' == result
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result = to_subnet('192.168.1.1', 24, dotted_notation=True)
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assert '192.168.1.0 255.255.255.0' == result
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def test_to_subnet_invalid():
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with pytest.raises(ValueError):
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to_subnet('foo', 'bar')
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def test_is_masklen():
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assert is_masklen(32)
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assert not is_masklen(33)
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assert not is_masklen('foo')
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def test_is_netmask():
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assert is_netmask('255.255.255.255')
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assert not is_netmask(24)
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assert not is_netmask('foo')
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def test_to_ipv6_network():
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assert '2001:db8::' == to_ipv6_network('2001:db8::')
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assert '2001:0db8:85a3::' == to_ipv6_network('2001:0db8:85a3:0000:0000:8a2e:0370:7334')
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assert '2001:0db8:85a3::' == to_ipv6_network('2001:0db8:85a3:0:0:8a2e:0370:7334')
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