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2172 lines (1697 loc) · 69.3 KB
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# Copyright 2007 Google Inc.
# Licensed to PSF under a Contributor Agreement.
"""A fast, lightweight IPv4/IPv6 manipulation library in Python.
This library is used to create/poke/manipulate IPv4 and IPv6 addresses
and networks.
"""
__version__ = '1.0'
import functools
IPV4LENGTH = 32
IPV6LENGTH = 128
class AddressValueError(ValueError):
"""A Value Error related to the address."""
class NetmaskValueError(ValueError):
"""A Value Error related to the netmask."""
def ip_address(address):
"""Take an IP string/int and return an object of the correct type.
Args:
address: A string or integer, the IP address. Either IPv4 or
IPv6 addresses may be supplied; integers less than 2**32 will
be considered to be IPv4 by default.
Returns:
An IPv4Address or IPv6Address object.
Raises:
ValueError: if the *address* passed isn't either a v4 or a v6
address
"""
try:
return IPv4Address(address)
except (AddressValueError, NetmaskValueError):
pass
try:
return IPv6Address(address)
except (AddressValueError, NetmaskValueError):
pass
raise ValueError('%r does not appear to be an IPv4 or IPv6 address' %
address)
def ip_network(address, strict=True):
"""Take an IP string/int and return an object of the correct type.
Args:
address: A string or integer, the IP network. Either IPv4 or
IPv6 networks may be supplied; integers less than 2**32 will
be considered to be IPv4 by default.
Returns:
An IPv4Network or IPv6Network object.
Raises:
ValueError: if the string passed isn't either a v4 or a v6
address. Or if the network has host bits set.
"""
try:
return IPv4Network(address, strict)
except (AddressValueError, NetmaskValueError):
pass
try:
return IPv6Network(address, strict)
except (AddressValueError, NetmaskValueError):
pass
raise ValueError('%r does not appear to be an IPv4 or IPv6 network' %
address)
def ip_interface(address):
"""Take an IP string/int and return an object of the correct type.
Args:
address: A string or integer, the IP address. Either IPv4 or
IPv6 addresses may be supplied; integers less than 2**32 will
be considered to be IPv4 by default.
Returns:
An IPv4Interface or IPv6Interface object.
Raises:
ValueError: if the string passed isn't either a v4 or a v6
address.
Notes:
The IPv?Interface classes describe an Address on a particular
Network, so they're basically a combination of both the Address
and Network classes.
"""
try:
return IPv4Interface(address)
except (AddressValueError, NetmaskValueError):
pass
try:
return IPv6Interface(address)
except (AddressValueError, NetmaskValueError):
pass
raise ValueError('%r does not appear to be an IPv4 or IPv6 interface' %
address)
def v4_int_to_packed(address):
"""Represent an address as 4 packed bytes in network (big-endian) order.
Args:
address: An integer representation of an IPv4 IP address.
Returns:
The integer address packed as 4 bytes in network (big-endian) order.
Raises:
ValueError: If the integer is negative or too large to be an
IPv4 IP address.
"""
try:
return address.to_bytes(4, 'big')
except OverflowError:
raise ValueError("Address negative or too large for IPv4")
def v6_int_to_packed(address):
"""Represent an address as 16 packed bytes in network (big-endian) order.
Args:
address: An integer representation of an IPv6 IP address.
Returns:
The integer address packed as 16 bytes in network (big-endian) order.
"""
try:
return address.to_bytes(16, 'big')
except OverflowError:
raise ValueError("Address negative or too large for IPv6")
def _split_optional_netmask(address):
"""Helper to split the netmask and raise AddressValueError if needed"""
addr = str(address).split('/')
if len(addr) > 2:
raise AddressValueError("Only one '/' permitted in %r" % address)
return addr
def _find_address_range(addresses):
"""Find a sequence of sorted deduplicated IPv#Address.
Args:
addresses: a list of IPv#Address objects.
Yields:
A tuple containing the first and last IP addresses in the sequence.
"""
it = iter(addresses)
first = last = next(it)
for ip in it:
if ip._ip != last._ip + 1:
yield first, last
first = ip
last = ip
yield first, last
def _count_righthand_zero_bits(number, bits):
"""Count the number of zero bits on the right hand side.
Args:
number: an integer.
bits: maximum number of bits to count.
Returns:
The number of zero bits on the right hand side of the number.
"""
if number == 0:
return bits
return min(bits, (~number & (number-1)).bit_length())
def summarize_address_range(first, last):
"""Summarize a network range given the first and last IP addresses.
Example:
>>> list(summarize_address_range(IPv4Address('192.0.2.0'),
... IPv4Address('192.0.2.130')))
... #doctest: +NORMALIZE_WHITESPACE
[IPv4Network('192.0.2.0/25'), IPv4Network('192.0.2.128/31'),
IPv4Network('192.0.2.130/32')]
Args:
first: the first IPv4Address or IPv6Address in the range.
last: the last IPv4Address or IPv6Address in the range.
Returns:
An iterator of the summarized IPv(4|6) network objects.
Raise:
TypeError:
If the first and last objects are not IP addresses.
If the first and last objects are not the same version.
ValueError:
If the last object is not greater than the first.
If the version of the first address is not 4 or 6.
"""
if (not (isinstance(first, _BaseAddress) and
isinstance(last, _BaseAddress))):
raise TypeError('first and last must be IP addresses, not networks')
if first.version != last.version:
raise TypeError("%s and %s are not of the same version" % (
first, last))
if first > last:
raise ValueError('last IP address must be greater than first')
if first.version == 4:
ip = IPv4Network
elif first.version == 6:
ip = IPv6Network
else:
raise ValueError('unknown IP version')
ip_bits = first._max_prefixlen
first_int = first._ip
last_int = last._ip
while first_int <= last_int:
nbits = min(_count_righthand_zero_bits(first_int, ip_bits),
(last_int - first_int + 1).bit_length() - 1)
net = ip((first_int, ip_bits - nbits))
yield net
first_int += 1 << nbits
if first_int - 1 == ip._ALL_ONES:
break
def _collapse_addresses_internal(addresses):
"""Loops through the addresses, collapsing concurrent netblocks.
Example:
ip1 = IPv4Network('192.0.2.0/26')
ip2 = IPv4Network('192.0.2.64/26')
ip3 = IPv4Network('192.0.2.128/26')
ip4 = IPv4Network('192.0.2.192/26')
_collapse_addresses_internal([ip1, ip2, ip3, ip4]) ->
[IPv4Network('192.0.2.0/24')]
This shouldn't be called directly; it is called via
collapse_addresses([]).
Args:
addresses: A list of IPv4Network's or IPv6Network's
Returns:
A list of IPv4Network's or IPv6Network's depending on what we were
passed.
"""
# First merge
to_merge = list(addresses)
subnets = {}
while to_merge:
net = to_merge.pop()
supernet = net.supernet()
existing = subnets.get(supernet)
if existing is None:
subnets[supernet] = net
elif existing != net:
# Merge consecutive subnets
del subnets[supernet]
to_merge.append(supernet)
# Then iterate over resulting networks, skipping subsumed subnets
last = None
for net in sorted(subnets.values()):
if last is not None:
# Since they are sorted, last.network_address <= net.network_address
# is a given.
if last.broadcast_address >= net.broadcast_address:
continue
yield net
last = net
def collapse_addresses(addresses):
"""Collapse a list of IP objects.
Example:
collapse_addresses([IPv4Network('192.0.2.0/25'),
IPv4Network('192.0.2.128/25')]) ->
[IPv4Network('192.0.2.0/24')]
Args:
addresses: An iterator of IPv4Network or IPv6Network objects.
Returns:
An iterator of the collapsed IPv(4|6)Network objects.
Raises:
TypeError: If passed a list of mixed version objects.
"""
addrs = []
ips = []
nets = []
# split IP addresses and networks
for ip in addresses:
if isinstance(ip, _BaseAddress):
if ips and ips[-1]._version != ip._version:
raise TypeError("%s and %s are not of the same version" % (
ip, ips[-1]))
ips.append(ip)
elif ip._prefixlen == ip._max_prefixlen:
if ips and ips[-1]._version != ip._version:
raise TypeError("%s and %s are not of the same version" % (
ip, ips[-1]))
try:
ips.append(ip.ip)
except AttributeError:
ips.append(ip.network_address)
else:
if nets and nets[-1]._version != ip._version:
raise TypeError("%s and %s are not of the same version" % (
ip, nets[-1]))
nets.append(ip)
# sort and dedup
ips = sorted(set(ips))
# find consecutive address ranges in the sorted sequence and summarize them
if ips:
for first, last in _find_address_range(ips):
addrs.extend(summarize_address_range(first, last))
return _collapse_addresses_internal(addrs + nets)
def get_mixed_type_key(obj):
"""Return a key suitable for sorting between networks and addresses.
Address and Network objects are not sortable by default; they're
fundamentally different so the expression
IPv4Address('192.0.2.0') <= IPv4Network('192.0.2.0/24')
doesn't make any sense. There are some times however, where you may wish
to have ipaddress sort these for you anyway. If you need to do this, you
can use this function as the key= argument to sorted().
Args:
obj: either a Network or Address object.
Returns:
appropriate key.
"""
if isinstance(obj, _BaseNetwork):
return obj._get_networks_key()
elif isinstance(obj, _BaseAddress):
return obj._get_address_key()
return NotImplemented
class _IPAddressBase:
"""The mother class."""
__slots__ = ()
@property
def exploded(self):
"""Return the longhand version of the IP address as a string."""
return self._explode_shorthand_ip_string()
@property
def compressed(self):
"""Return the shorthand version of the IP address as a string."""
return str(self)
@property
def reverse_pointer(self):
"""The name of the reverse DNS pointer for the IP address, e.g.:
>>> ipaddress.ip_address("127.0.0.1").reverse_pointer
'1.0.0.127.in-addr.arpa'
>>> ipaddress.ip_address("2001:db8::1").reverse_pointer
'1.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.8.b.d.0.1.0.0.2.ip6.arpa'
"""
return self._reverse_pointer()
@property
def version(self):
msg = '%200s has no version specified' % (type(self),)
raise NotImplementedError(msg)
def _check_int_address(self, address):
if address < 0:
msg = "%d (< 0) is not permitted as an IPv%d address"
raise AddressValueError(msg % (address, self._version))
if address > self._ALL_ONES:
msg = "%d (>= 2**%d) is not permitted as an IPv%d address"
raise AddressValueError(msg % (address, self._max_prefixlen,
self._version))
def _check_packed_address(self, address, expected_len):
address_len = len(address)
if address_len != expected_len:
msg = "%r (len %d != %d) is not permitted as an IPv%d address"
raise AddressValueError(msg % (address, address_len,
expected_len, self._version))
@classmethod
def _ip_int_from_prefix(cls, prefixlen):
"""Turn the prefix length into a bitwise netmask
Args:
prefixlen: An integer, the prefix length.
Returns:
An integer.
"""
return cls._ALL_ONES ^ (cls._ALL_ONES >> prefixlen)
@classmethod
def _prefix_from_ip_int(cls, ip_int):
"""Return prefix length from the bitwise netmask.
Args:
ip_int: An integer, the netmask in expanded bitwise format
Returns:
An integer, the prefix length.
Raises:
ValueError: If the input intermingles zeroes & ones
"""
trailing_zeroes = _count_righthand_zero_bits(ip_int,
cls._max_prefixlen)
prefixlen = cls._max_prefixlen - trailing_zeroes
leading_ones = ip_int >> trailing_zeroes
all_ones = (1 << prefixlen) - 1
if leading_ones != all_ones:
byteslen = cls._max_prefixlen // 8
details = ip_int.to_bytes(byteslen, 'big')
msg = 'Netmask pattern %r mixes zeroes & ones'
raise ValueError(msg % details)
return prefixlen
@classmethod
def _report_invalid_netmask(cls, netmask_str):
msg = '%r is not a valid netmask' % netmask_str
raise NetmaskValueError(msg) from None
@classmethod
def _prefix_from_prefix_string(cls, prefixlen_str):
"""Return prefix length from a numeric string
Args:
prefixlen_str: The string to be converted
Returns:
An integer, the prefix length.
Raises:
NetmaskValueError: If the input is not a valid netmask
"""
# int allows a leading +/- as well as surrounding whitespace,
# so we ensure that isn't the case
if not (prefixlen_str.isascii() and prefixlen_str.isdigit()):
cls._report_invalid_netmask(prefixlen_str)
try:
prefixlen = int(prefixlen_str)
except ValueError:
cls._report_invalid_netmask(prefixlen_str)
if not (0 <= prefixlen <= cls._max_prefixlen):
cls._report_invalid_netmask(prefixlen_str)
return prefixlen
@classmethod
def _prefix_from_ip_string(cls, ip_str):
"""Turn a netmask/hostmask string into a prefix length
Args:
ip_str: The netmask/hostmask to be converted
Returns:
An integer, the prefix length.
Raises:
NetmaskValueError: If the input is not a valid netmask/hostmask
"""
# Parse the netmask/hostmask like an IP address.
try:
ip_int = cls._ip_int_from_string(ip_str)
except AddressValueError:
cls._report_invalid_netmask(ip_str)
# Try matching a netmask (this would be /1*0*/ as a bitwise regexp).
# Note that the two ambiguous cases (all-ones and all-zeroes) are
# treated as netmasks.
try:
return cls._prefix_from_ip_int(ip_int)
except ValueError:
pass
# Invert the bits, and try matching a /0+1+/ hostmask instead.
ip_int ^= cls._ALL_ONES
try:
return cls._prefix_from_ip_int(ip_int)
except ValueError:
cls._report_invalid_netmask(ip_str)
@classmethod
def _split_addr_prefix(cls, address):
"""Helper function to parse address of Network/Interface.
Arg:
address: Argument of Network/Interface.
Returns:
(addr, prefix) tuple.
"""
# a packed address or integer
if isinstance(address, (bytes, int)):
return address, cls._max_prefixlen
if not isinstance(address, tuple):
# Assume input argument to be string or any object representation
# which converts into a formatted IP prefix string.
address = _split_optional_netmask(address)
# Constructing from a tuple (addr, [mask])
if len(address) > 1:
return address
return address[0], cls._max_prefixlen
def __reduce__(self):
return self.__class__, (str(self),)
@functools.total_ordering
class _BaseAddress(_IPAddressBase):
"""A generic IP object.
This IP class contains the version independent methods which are
used by single IP addresses.
"""
__slots__ = ()
def __int__(self):
return self._ip
def __eq__(self, other):
try:
return (self._ip == other._ip
and self._version == other._version)
except AttributeError:
return NotImplemented
def __lt__(self, other):
if not isinstance(other, _BaseAddress):
return NotImplemented
if self._version != other._version:
raise TypeError('%s and %s are not of the same version' % (
self, other))
if self._ip != other._ip:
return self._ip < other._ip
return False
# Shorthand for Integer addition and subtraction. This is not
# meant to ever support addition/subtraction of addresses.
def __add__(self, other):
if not isinstance(other, int):
return NotImplemented
return self.__class__(int(self) + other)
def __sub__(self, other):
if not isinstance(other, int):
return NotImplemented
return self.__class__(int(self) - other)
def __repr__(self):
return '%s(%r)' % (self.__class__.__name__, str(self))
def __str__(self):
return str(self._string_from_ip_int(self._ip))
def __hash__(self):
return hash(hex(int(self._ip)))
def _get_address_key(self):
return (self._version, self)
def __reduce__(self):
return self.__class__, (self._ip,)
@functools.total_ordering
class _BaseNetwork(_IPAddressBase):
"""A generic IP network object.
This IP class contains the version independent methods which are
used by networks.
"""
def __repr__(self):
return '%s(%r)' % (self.__class__.__name__, str(self))
def __str__(self):
return '%s/%d' % (self.network_address, self.prefixlen)
def hosts(self):
"""Generate Iterator over usable hosts in a network.
This is like __iter__ except it doesn't return the network
or broadcast addresses.
"""
network = int(self.network_address)
broadcast = int(self.broadcast_address)
for x in range(network + 1, broadcast):
yield self._address_class(x)
def __iter__(self):
network = int(self.network_address)
broadcast = int(self.broadcast_address)
for x in range(network, broadcast + 1):
yield self._address_class(x)
def __getitem__(self, n):
network = int(self.network_address)
broadcast = int(self.broadcast_address)
if n >= 0:
if network + n > broadcast:
raise IndexError('address out of range')
return self._address_class(network + n)
else:
n += 1
if broadcast + n < network:
raise IndexError('address out of range')
return self._address_class(broadcast + n)
def __lt__(self, other):
if not isinstance(other, _BaseNetwork):
return NotImplemented
if self._version != other._version:
raise TypeError('%s and %s are not of the same version' % (
self, other))
if self.network_address != other.network_address:
return self.network_address < other.network_address
if self.netmask != other.netmask:
return self.netmask < other.netmask
return False
def __eq__(self, other):
try:
return (self._version == other._version and
self.network_address == other.network_address and
int(self.netmask) == int(other.netmask))
except AttributeError:
return NotImplemented
def __hash__(self):
return hash(int(self.network_address) ^ int(self.netmask))
def __contains__(self, other):
# always false if one is v4 and the other is v6.
if self._version != other._version:
return False
# dealing with another network.
if isinstance(other, _BaseNetwork):
return False
# dealing with another address
else:
# address
return (int(self.network_address) <= int(other._ip) <=
int(self.broadcast_address))
def overlaps(self, other):
"""Tell if self is partly contained in other."""
return self.network_address in other or (
self.broadcast_address in other or (
other.network_address in self or (
other.broadcast_address in self)))
@functools.cached_property
def broadcast_address(self):
return self._address_class(int(self.network_address) |
int(self.hostmask))
@functools.cached_property
def hostmask(self):
return self._address_class(int(self.netmask) ^ self._ALL_ONES)
@property
def with_prefixlen(self):
return '%s/%d' % (self.network_address, self._prefixlen)
@property
def with_netmask(self):
return '%s/%s' % (self.network_address, self.netmask)
@property
def with_hostmask(self):
return '%s/%s' % (self.network_address, self.hostmask)
@property
def num_addresses(self):
"""Number of hosts in the current subnet."""
return int(self.broadcast_address) - int(self.network_address) + 1
@property
def _address_class(self):
# Returning bare address objects (rather than interfaces) allows for
# more consistent behaviour across the network address, broadcast
# address and individual host addresses.
msg = '%200s has no associated address class' % (type(self),)
raise NotImplementedError(msg)
@property
def prefixlen(self):
return self._prefixlen
def address_exclude(self, other):
"""Remove an address from a larger block.
For example:
addr1 = ip_network('192.0.2.0/28')
addr2 = ip_network('192.0.2.1/32')
list(addr1.address_exclude(addr2)) =
[IPv4Network('192.0.2.0/32'), IPv4Network('192.0.2.2/31'),
IPv4Network('192.0.2.4/30'), IPv4Network('192.0.2.8/29')]
or IPv6:
addr1 = ip_network('2001:db8::1/32')
addr2 = ip_network('2001:db8::1/128')
list(addr1.address_exclude(addr2)) =
[ip_network('2001:db8::1/128'),
ip_network('2001:db8::2/127'),
ip_network('2001:db8::4/126'),
ip_network('2001:db8::8/125'),
...
ip_network('2001:db8:8000::/33')]
Args:
other: An IPv4Network or IPv6Network object of the same type.
Returns:
An iterator of the IPv(4|6)Network objects which is self
minus other.
Raises:
TypeError: If self and other are of differing address
versions, or if other is not a network object.
ValueError: If other is not completely contained by self.
"""
if not self._version == other._version:
raise TypeError("%s and %s are not of the same version" % (
self, other))
if not isinstance(other, _BaseNetwork):
raise TypeError("%s is not a network object" % other)
if not other.subnet_of(self):
raise ValueError('%s not contained in %s' % (other, self))
if other == self:
return
# Make sure we're comparing the network of other.
other = other.__class__('%s/%s' % (other.network_address,
other.prefixlen))
s1, s2 = self.subnets()
while s1 != other and s2 != other:
if other.subnet_of(s1):
yield s2
s1, s2 = s1.subnets()
elif other.subnet_of(s2):
yield s1
s1, s2 = s2.subnets()
else:
# If we got here, there's a bug somewhere.
raise AssertionError('Error performing exclusion: '
's1: %s s2: %s other: %s' %
(s1, s2, other))
if s1 == other:
yield s2
elif s2 == other:
yield s1
else:
# If we got here, there's a bug somewhere.
raise AssertionError('Error performing exclusion: '
's1: %s s2: %s other: %s' %
(s1, s2, other))
def compare_networks(self, other):
"""Compare two IP objects.
This is only concerned about the comparison of the integer
representation of the network addresses. This means that the
host bits aren't considered at all in this method. If you want
to compare host bits, you can easily enough do a
'HostA._ip < HostB._ip'
Args:
other: An IP object.
Returns:
If the IP versions of self and other are the same, returns:
-1 if self < other:
eg: IPv4Network('192.0.2.0/25') < IPv4Network('192.0.2.128/25')
IPv6Network('2001:db8::1000/124') <
IPv6Network('2001:db8::2000/124')
0 if self == other
eg: IPv4Network('192.0.2.0/24') == IPv4Network('192.0.2.0/24')
IPv6Network('2001:db8::1000/124') ==
IPv6Network('2001:db8::1000/124')
1 if self > other
eg: IPv4Network('192.0.2.128/25') > IPv4Network('192.0.2.0/25')
IPv6Network('2001:db8::2000/124') >
IPv6Network('2001:db8::1000/124')
Raises:
TypeError if the IP versions are different.
"""
# does this need to raise a ValueError?
if self._version != other._version:
raise TypeError('%s and %s are not of the same type' % (
self, other))
# self._version == other._version below here:
if self.network_address < other.network_address:
return -1
if self.network_address > other.network_address:
return 1
# self.network_address == other.network_address below here:
if self.netmask < other.netmask:
return -1
if self.netmask > other.netmask:
return 1
return 0
def _get_networks_key(self):
"""Network-only key function.
Returns an object that identifies this address' network and
netmask. This function is a suitable "key" argument for sorted()
and list.sort().
"""
return (self._version, self.network_address, self.netmask)
def subnets(self, prefixlen_diff=1, new_prefix=None):
"""The subnets which join to make the current subnet.
In the case that self contains only one IP
(self._prefixlen == 32 for IPv4 or self._prefixlen == 128
for IPv6), yield an iterator with just ourself.
Args:
prefixlen_diff: An integer, the amount the prefix length
should be increased by. This should not be set if
new_prefix is also set.
new_prefix: The desired new prefix length. This must be a
larger number (smaller prefix) than the existing prefix.
This should not be set if prefixlen_diff is also set.
Returns:
An iterator of IPv(4|6) objects.
Raises:
ValueError: The prefixlen_diff is too small or too large.
OR
prefixlen_diff and new_prefix are both set or new_prefix
is a smaller number than the current prefix (smaller
number means a larger network)
"""
if self._prefixlen == self._max_prefixlen:
yield self
return
if new_prefix is not None:
if new_prefix < self._prefixlen:
raise ValueError('new prefix must be longer')
if prefixlen_diff != 1:
raise ValueError('cannot set prefixlen_diff and new_prefix')
prefixlen_diff = new_prefix - self._prefixlen
if prefixlen_diff < 0:
raise ValueError('prefix length diff must be > 0')
new_prefixlen = self._prefixlen + prefixlen_diff
if new_prefixlen > self._max_prefixlen:
raise ValueError(
'prefix length diff %d is invalid for netblock %s' % (
new_prefixlen, self))
start = int(self.network_address)
end = int(self.broadcast_address) + 1
step = (int(self.hostmask) + 1) >> prefixlen_diff
for new_addr in range(start, end, step):
current = self.__class__((new_addr, new_prefixlen))
yield current
def supernet(self, prefixlen_diff=1, new_prefix=None):
"""The supernet containing the current network.
Args:
prefixlen_diff: An integer, the amount the prefix length of
the network should be decreased by. For example, given a
/24 network and a prefixlen_diff of 3, a supernet with a
/21 netmask is returned.
Returns:
An IPv4 network object.
Raises:
ValueError: If self.prefixlen - prefixlen_diff < 0. I.e., you have
a negative prefix length.
OR
If prefixlen_diff and new_prefix are both set or new_prefix is a
larger number than the current prefix (larger number means a
smaller network)
"""
if self._prefixlen == 0:
return self
if new_prefix is not None:
if new_prefix > self._prefixlen:
raise ValueError('new prefix must be shorter')
if prefixlen_diff != 1:
raise ValueError('cannot set prefixlen_diff and new_prefix')
prefixlen_diff = self._prefixlen - new_prefix
new_prefixlen = self.prefixlen - prefixlen_diff
if new_prefixlen < 0:
raise ValueError(
'current prefixlen is %d, cannot have a prefixlen_diff of %d' %
(self.prefixlen, prefixlen_diff))
return self.__class__((
int(self.network_address) & (int(self.netmask) << prefixlen_diff),
new_prefixlen
))
@property
def is_multicast(self):
"""Test if the address is reserved for multicast use.
Returns:
A boolean, True if the address is a multicast address.
See RFC 2373 2.7 for details.
"""
return (self.network_address.is_multicast and
self.broadcast_address.is_multicast)
@staticmethod
def _is_subnet_of(a, b):
try:
# Always false if one is v4 and the other is v6.
if a._version != b._version:
raise TypeError(f"{a} and {b} are not of the same version")
return (b.network_address <= a.network_address and
b.broadcast_address >= a.broadcast_address)
except AttributeError:
raise TypeError(f"Unable to test subnet containment "
f"between {a} and {b}")
def subnet_of(self, other):
"""Return True if this network is a subnet of other."""