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# Copyright (c) 2016 Red Hat Inc
# Simplified BSD License (see licenses/simplified_bsd.txt or https://opensource.org/licenses/BSD-2-Clause)
# General networking tools that may be used by all modules
from __future__ import (absolute_import, division, print_function)
__metaclass__ = type
import re
from struct import pack
from socket import inet_ntoa
from ansible.module_utils.six.moves import zip
VALID_MASKS = [2**8 - 2**i for i in range(0, 9)]
def is_netmask(val):
parts = str(val).split('.')
if not len(parts) == 4:
return False
for part in parts:
try:
if int(part) not in VALID_MASKS:
raise ValueError
except ValueError:
return False
return True
def is_masklen(val):
try:
return 0 <= int(val) <= 32
except ValueError:
return False
def to_netmask(val):
""" converts a masklen to a netmask """
if not is_masklen(val):
raise ValueError('invalid value for masklen')
bits = 0
for i in range(32 - int(val), 32):
bits |= (1 << i)
return inet_ntoa(pack('>I', bits))
def to_masklen(val):
""" converts a netmask to a masklen """
if not is_netmask(val):
raise ValueError('invalid value for netmask: %s' % val)
bits = list()
for x in val.split('.'):
octet = bin(int(x)).count('1')
bits.append(octet)
return sum(bits)
def to_subnet(addr, mask, dotted_notation=False):
""" coverts an addr / mask pair to a subnet in cidr notation """
try:
if not is_masklen(mask):
raise ValueError
cidr = int(mask)
mask = to_netmask(mask)
except ValueError:
cidr = to_masklen(mask)
addr = addr.split('.')
mask = mask.split('.')
network = list()
for s_addr, s_mask in zip(addr, mask):
network.append(str(int(s_addr) & int(s_mask)))
if dotted_notation:
return '%s %s' % ('.'.join(network), to_netmask(cidr))
return '%s/%s' % ('.'.join(network), cidr)
def to_ipv6_subnet(addr):
""" IPv6 addresses are eight groupings. The first four groupings (64 bits) comprise the subnet address. """
# https://tools.ietf.org/rfc/rfc2374.txt
# Split by :: to identify omitted zeros
ipv6_prefix = addr.split('::')[0]
# Get the first four groups, or as many as are found + ::
found_groups = []
for group in ipv6_prefix.split(':'):
found_groups.append(group)
if len(found_groups) == 4:
break
if len(found_groups) < 4:
found_groups.append('::')
# Concatenate network address parts
network_addr = ''
for group in found_groups:
if group != '::':
network_addr += str(group)
network_addr += str(':')
# Ensure network address ends with ::
if not network_addr.endswith('::'):
network_addr += str(':')
return network_addr
def to_ipv6_network(addr):
""" IPv6 addresses are eight groupings. The first three groupings (48 bits) comprise the network address. """
# Split by :: to identify omitted zeros
ipv6_prefix = addr.split('::')[0]
# Get the first three groups, or as many as are found + ::
found_groups = []
for group in ipv6_prefix.split(':'):
found_groups.append(group)
if len(found_groups) == 3:
break
if len(found_groups) < 3:
found_groups.append('::')
# Concatenate network address parts
network_addr = ''
for group in found_groups:
if group != '::':
network_addr += str(group)
network_addr += str(':')
# Ensure network address ends with ::
if not network_addr.endswith('::'):
network_addr += str(':')
return network_addr
def to_bits(val):
""" converts a netmask to bits """
bits = ''
for octet in val.split('.'):
bits += bin(int(octet))[2:].zfill(8)
return bits
def is_mac(mac_address):
"""
Validate MAC address for given string
Args:
mac_address: string to validate as MAC address
Returns: (Boolean) True if string is valid MAC address, otherwise False
"""
mac_addr_regex = re.compile('[0-9a-f]{2}([-:])[0-9a-f]{2}(\\1[0-9a-f]{2}){4}$')
return bool(mac_addr_regex.match(mac_address.lower()))
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