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Issue 14814: Docs work showed some more cases of networks pretending to be addresses and highlighted the weird approach to implementing the 'is_whatever' properties. Impl now illustrates far more clearly that networks have a property if both their network and broadcast addresses have that property

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Nick Coghlan 2012-08-05 22:02:18 +10:00
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Doc/library/ipaddress.rst
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@ -9,17 +9,26 @@
--------------
The :mod:`ipaddress` module provides the capabilities to create, manipulate and
operate on IPv4 and IPv6 addresses and networks.
.. note::
This is the full module API reference - for an overview and introduction,
see :ref:`ipaddress-howto`.
The ``ipaddress`` module has been included in the standard library on a
:term:`provisional basis <provisional package>`. Backwards incompatible
changes (up to and including removal of the package) may occur if deemed
necessary by the core developers.
:mod:`ipaddress` provides the capabilities to create, manipulate and
operate on IPv4 and IPv6 addresses and networks.
The functions and classes in this module make it straightforward to handle
various tasks related to IP addresses, including checking whether or not two
hosts are on the same subnet, iterating over all hosts in a particular
subnet, as well as checking whether or not a string represents a valid
IP address or network definition.
subnet, checking whether or not a string represents a valid IP address or
network definition, and so on.
This is the full module API reference - for an overview and introduction,
see :ref:`ipaddress-howto`.
.. versionadded:: 3.3
Convenience factory functions
@ -65,15 +74,24 @@ IP addresses, networks and interfaces:
:exc:`ValueError` is raised if *address* does not represent a valid IPv4 or
IPv6 address.
One downside of these convenience functions is that the need to handle both
IPv4 and IPv6 formats means that error messages provide minimal
information on the precise error, as the functions don't know whether the
IPv4 or IPv6 format was intended. More detailed error reporting can be
obtained by calling the appropriate version specific class constructors
directly.
IP Addresses
------------
Address objects
---------------
^^^^^^^^^^^^^^^
The :class:`IPv4Address` and :class:`IPv6Address` objects share a lot of common
attributes. Some attributes that are only meaningful for IPv6 addresses are
also implemented by :class:`IPv4Address` objects, in order to make it easier to
write code that handles both IP versions correctly. To avoid duplication, all
common attributes will only be documented for :class:`IPv4Address`.
write code that handles both IP versions correctly.
.. class:: IPv4Address(address)
@ -84,66 +102,79 @@ common attributes will only be documented for :class:`IPv4Address`.
1. A string in decimal-dot notation, consisting of four decimal integers in
the inclusive range 0-255, separated by dots (e.g. ``192.168.0.1``). Each
integer represents an octet (byte) in the address, big-endian.
integer represents an octet (byte) in the address. Leading zeroes are
tolerated only for values less then 8 (as there is no ambiguity
between the decimal and octal interpretations of such strings).
2. An integer that fits into 32 bits.
3. An integer packed into a :class:`bytes` object of length 4, big-endian.
3. An integer packed into a :class:`bytes` object of length 4 (most
significant octet first).
>>> ipaddress.IPv4Address('192.168.0.1')
IPv4Address('192.168.0.1')
>>> ipaddress.IPv4Address('192.0.2.1') == ipaddress.IPv4Address(3221225985)
True
.. attribute:: exploded
The longhand version of the address as a string. Note: the
exploded/compressed distinction is meaningful only for IPv6 addresses.
For IPv4 addresses it is the same.
.. attribute:: compressed
The shorthand version of the address as a string.
.. attribute:: packed
The binary representation of this address - a :class:`bytes` object.
>>> ipaddress.IPv4Address(3221225985)
IPv4Address('192.168.0.1')
>>> ipaddress.IPv4Address(b'\xC0\xA8\x00\x01')
IPv4Address('192.168.0.1')
.. attribute:: version
A numeric version number.
The appropriate version number: ``4`` for IPv4, ``6`` for IPv6.
.. attribute:: max_prefixlen
Maximal length of the prefix (in bits). The prefix defines the number of
leading bits in an address that are compared to determine whether or not an
address is part of a network.
The total number of bits in the address representation for this
version: ``32`` for IPv4, ``128`` for IPv6.
The prefix defines the number of leading bits in an address that
are compared to determine whether or not an address is part of a
network.
.. attribute:: compressed
.. attribute:: exploded
The string representation in dotted decimal notation. Leading zeroes
are never included in the representation.
As IPv4 does not define a shorthand notation for addresses with octets
set to zero, these two attributes are always the same as ``str(addr)``
for IPv4 addresses. Exposing these attributes makes it easier to
write display code that can handle both IPv4 and IPv6 addresses.
.. attribute:: packed
The binary representation of this address - a :class:`bytes` object of
the appropriate length (most significant octet first). This is 4 bytes
for IPv4 and 16 bytes for IPv6.
.. attribute:: is_multicast
``True`` if the address is reserved for multicast use. See :RFC:`3171` (for
IPv4) or :RFC:`2373` (for IPv6).
``True`` if the address is reserved for multicast use. See
:RFC:`3171` (for IPv4) or :RFC:`2373` (for IPv6).
.. attribute:: is_private
``True`` if the address is allocated for private networks. See :RFC:`1918`
(for IPv4) or :RFC:`4193` (for IPv6).
``True`` if the address is allocated for private networks. See
:RFC:`1918` (for IPv4) or :RFC:`4193` (for IPv6).
.. attribute:: is_unspecified
``True`` if the address is unspecified. See :RFC:`5375` (for IPv4) or
:RFC:`2373` (for IPv6).
``True`` if the address is unspecified. See :RFC:`5375` (for IPv4)
or :RFC:`2373` (for IPv6).
.. attribute:: is_reserved
``True`` if the address is otherwise IETF reserved.
``True`` if the address is otherwise IETF reserved.
.. attribute:: is_loopback
``True`` if this is a loopback address. See :RFC:`3330` (for IPv4) or
:RFC:`2373` (for IPv6).
``True`` if this is a loopback address. See :RFC:`3330` (for IPv4)
or :RFC:`2373` (for IPv6).
.. attribute:: is_link_local
``True`` if the address is reserved for link-local. See :RFC:`3927`.
``True`` if the address is reserved for link-local usage. See
:RFC:`3927`.
.. class:: IPv6Address(address)
@ -165,31 +196,79 @@ common attributes will only be documented for :class:`IPv4Address`.
>>> ipaddress.IPv6Address('2001:db8::1000')
IPv6Address('2001:db8::1000')
All the attributes exposed by :class:`IPv4Address` are supported. In
addition, the following attributs are exposed only by :class:`IPv6Address`.
All the attributes implemented by :class:`IPv4Address` are supported. In
addition, the following attributs are implemented only by
:class:`IPv6Address`.
.. attribute:: compressed
The short form of the address representation, with leading zeroes in
groups omitted and the longest sequence of groups consisting entirely of
zeroes collapsed to a single empty group.
This is also the value returned by ``str(addr)`` for IPv6 addresses.
.. attribute:: exploded
The long form of the address representation, with all leading zeroes and
groups consisting entirely of zeroes included.
.. attribute:: packed
.. attribute:: version
.. attribute:: max_prefixlen
.. attribute:: is_multicast
.. attribute:: is_private
.. attribute:: is_unspecified
.. attribute:: is_reserved
.. attribute:: is_loopback
.. attribute:: is_link_local
Refer to the corresponding attribute documentation in
:class:`IPv4Address`
.. attribute:: is_site_local
``True`` if the address is reserved for site-local. Note that the site-local
address space has been deprecated by :RFC:`3879`. Use
:attr:`~IPv4Address.is_private` to test if this address is in the space of
unique local addresses as defined by :RFC:`4193`.
``True`` if the address is reserved for site-local usage. Note that
the site-local address space has been deprecated by :RFC:`3879`. Use
:attr:`~IPv4Address.is_private` to test if this address is in the
space of unique local addresses as defined by :RFC:`4193`.
.. attribute:: ipv4_mapped
If this address represents a IPv4 mapped address, return the IPv4 mapped
address. Otherwise return ``None``.
.. attribute:: teredo
If this address appears to be a teredo address (starts with ``2001::/32``),
return a tuple of embedded teredo IPs ``(server, client)`` pairs. Otherwise
return ``None``.
For addresses that appear to be IPv4 mapped addresses (starting with
``::FFFF/96``), this property will report the embedded IPv4 address.
For any other address, this property will be ``None``.
.. attribute:: sixtofour
If this address appears to contain a 6to4 embedded address, return the
embedded IPv4 address. Otherwise return ``None``.
For addresses that appear to be 6to4 addresses (starting with
``2002::/16``) as defined by :RFC:`3056`, this property will report
the embedded IPv4 address. For any other address, this property will
be ``None``.
.. attribute:: teredo
For addresses that appear to be Teredo addresses (starting with
``2001::/32``) as defined by :RFC:`4380`, this property will report
the embedded ``(server, client)`` IP address pair. For any other
address, this property will be ``None``.
Conversion to Strings and Integers
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
To interoperate with networking interfaces such as the socket module,
addresses must be converted to strings or integers. This is handled using
the :func:`str` and :func:`int` builtin functions::
>>> str(ipaddress.IPv4Address('192.168.0.1'))
'192.168.0.1'
>>> int(ipaddress.IPv4Address('192.168.0.1'))
3232235521
>>> str(ipaddress.IPv6Address('::1'))
'::1'
>>> int(ipaddress.IPv6Address('::1'))
1
Operators
@ -199,6 +278,7 @@ Address objects support some operators. Unless stated otherwise, operators can
only be applied between compatible objects (i.e. IPv4 with IPv4, IPv6 with
IPv6).
Logical operators
"""""""""""""""""
@ -212,6 +292,7 @@ examples::
>>> IPv4Address('127.0.0.2') != IPv4Address('127.0.0.1')
True
Arithmetic operators
""""""""""""""""""""
@ -227,45 +308,274 @@ Integers can be added to or subtracted from address objects. Some examples::
ipaddress.AddressValueError: 4294967296 (>= 2**32) is not permitted as an IPv4 address
IP Network definitions
----------------------
The :class:`IPv4Network` and :class:`IPv6Network` objects provide a mechanism
for defining and inspecting IP network definitions. A network definition
consists of a *mask* and a *network address*, and as such defines a range of
IP addresses that equal the network address when masked (binary AND) with the
mask. For example, a network definition with the mask ``255.255.255.0`` and
the network address ``192.168.1.0`` consists of IP addresses in the inclusive
range ``192.168.1.0`` to ``192.168.1.255``.
Prefix, net mask and host mask
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
There are several equivalent ways to specify IP network masks. A *prefix*
``/<nbits>`` is a notation that denotes how many high-order bits are set in
the network mask. A *net mask* is an IP address with some number of
high-order bits set. Thus the prefix ``/24`` is equivalent to the net mask
``255.255.255.0`` in IPv4, or ``ffff:ff00::`` in IPv6. In addition, a
*host mask* is the logical inverse of a *net mask*, and is sometimes used
(for example in Cisco access control lists) to denote a network mask. The
host mask equivalent to ``/24`` in IPv4 is ``0.0.0.255``.
Network objects
---------------
^^^^^^^^^^^^^^^
All attributes implemented by address objects are implemented by network
objects as well. In addition, network objects implement additional attributes.
All of these are common between :class:`IPv4Network` and :class:`IPv6Network`,
so to avoid duplication they are only documented for :class:`IPv4Network`.
.. class:: IPv4Network(address, strict=True)
Construct an IPv4 network. *address* is a string or integer representing the
IP address (and optionally the network). An :exc:`AddressValueError` is
raised if *address* is not a valid IPv4 address. A :exc:`NetmaskValueError`
is raised if the netmask is not valid for an IPv4 address.
Construct an IPv4 network definition. *address* can be one of the following:
1. A string consisting of an IP address and an optional mask, separated by
a slash (``/``). The IP address is the network address, and the mask
can be either a single number, which means it's a *prefix*, or a string
representation of an IPv4 address. If it's the latter, the mask is
interpreted as a *net mask* if it starts with a non-zero field, or as
a *host mask* if it starts with a zero field. If no mask is provided,
it's considered to be ``/32``.
For example, the following *address* specifications are equivalent:
``192.168.1.0/24``, ``192.168.1.0/255.255.255.0`` and
``192.168.1.0/0.0.0.255``.
2. An integer that fits into 32 bits. This is equivalent to a
single-address network, with the network address being *address* and
the mask being ``/32``.
3. An integer packed into a :class:`bytes` object of length 4, big-endian.
The interpretation is similar to an integer *address*.
An :exc:`AddressValueError` is raised if *address* is not a valid IPv4
address. A :exc:`NetmaskValueError` is raised if the mask is not valid for
an IPv4 address.
If *strict* is ``True`` and host bits are set in the supplied address,
then :exc:`ValueError` is raised. Otherwise, the host bits are masked out
then :exc:`ValueError` is raised. Otherwise, the host bits are masked out
to determine the appropriate network address.
>>> ipaddress.IPv4Network('192.0.2.0/27')
IPv4Network('192.0.2.0/27')
>>> ipaddress.IPv4Network('192.0.2.0/27').netmask
IPv4Address('255.255.255.224')
>>> ipaddress.IPv4Network('192.0.2.5/27', strict=False)
IPv4Network('192.0.2.0/27')
This class implements all the attributes of :class:`IPv4Address`, and also
the following attributes and methods. Unless stated otherwise, all methods
accepting other network / address objects will raise :exc:`TypeError` if
the argument's IP version is incompatible to ``self``:
.. attribute:: broadcast_address
The broadcast address for the network.
.. attribute:: host mask
The host mask, as a string.
.. attribute:: with_prefixlen
A string representation of the network, with the mask in prefix notation.
.. attribute:: with_netmask
A string representation of the network, with the mask in net mask notation.
.. attribute:: with_hostmask
A string representation of the network, with the mask in host mask notation.
.. attribute:: num_addresses
The total number of addresses in the network.
.. attribute:: prefixlen
Length of the prefix, in bits.
.. method:: hosts()
Generates an iterator over the usable hosts in the network. The usable hosts
are all the IP addresses that belong to the network, except the network
address itself and the network broadcast address.
>>> list(ip_network('192.0.2.0/29').hosts())
[IPv4Address('192.0.2.1'), IPv4Address('192.0.2.2'),
IPv4Address('192.0.2.3'), IPv4Address('192.0.2.4'),
IPv4Address('192.0.2.5'), IPv4Address('192.0.2.6')]
.. method:: overlaps(other)
``True`` if this network is partly contained in *other*.
.. method:: address_exclude(network)
Computes the network defintions resulting from removing the given *network*
from this one. Returns a generator. Raises :exc:`ValueError` if *network*
is not completely contained in this network.
>>> n1 = ip_network('192.0.2.0/28')
>>> n2 = ip_network('192.0.2.1/32')
>>> list(n1.address_exclude(n2))
[IPv4Network('192.0.2.8/29'), IPv4Network('192.0.2.4/30'),
IPv4Network('192.0.2.2/31'), IPv4Network('192.0.2.0/32')]
.. method:: subnets(prefixlen_diff=1, new_prefix=None)
The subnets that join to make the current network definition, depending on
the argument values. *prefixlen_diff* is the amount our prefix length
should be increased by. *new_prefix* is the desired new prefix of the
subnets; it must be larger than our prefix. One and only one of
*prefixlen_diff* and *new_prefix* must be set. Returns an iterator of
network objects.
>>> list(ip_network('192.0.2.0/24').subnets())
[IPv4Network('192.0.2.0/25'), IPv4Network('192.0.2.128/25')]
>>> list(ip_network('192.0.2.0/24').subnets(prefixlen_diff=2))
[IPv4Network('192.0.2.0/26'), IPv4Network('192.0.2.64/26'),
IPv4Network('192.0.2.128/26'), IPv4Network('192.0.2.192/26')]
>>> list(ip_network('192.0.2.0/24').subnets(new_prefix=26))
[IPv4Network('192.0.2.0/26'), IPv4Network('192.0.2.64/26'),
IPv4Network('192.0.2.128/26'), IPv4Network('192.0.2.192/26')]
>>> list(ip_network('192.0.2.0/24').subnets(new_prefix=23))
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
raise ValueError('new prefix must be longer')
ValueError: new prefix must be longer
>>> list(ip_network('192.0.2.0/24').subnets(new_prefix=25))
[IPv4Network('192.0.2.0/25'), IPv4Network('192.0.2.128/25')]
>>>
.. method:: supernet(prefixlen_diff=1, new_prefix=None)
The supernet containing this network definition, depending on the argument
values. *prefixlen_diff* is the amount our prefix length should be
decreased by. *new_prefix* is the desired new prefix of the supernet; it
must be smaller than our prefix. One and only one of *prefixlen_diff* and
*new_prefix* must be set. Returns a single network object.
>>> ip_network('192.0.2.0/24').supernet()
IPv4Network('192.0.2.0/23')
>>> ip_network('192.0.2.0/24').supernet(prefixlen_diff=2)
IPv4Network('192.0.0.0/22')
>>> ip_network('192.0.2.0/24').supernet(new_prefix=20)
IPv4Network('192.0.0.0/20')
.. method:: compare_networks(other)
Compare this network to *other*. In this comparison only the network
addresses are considered; host bits aren't. Returns either ``-1``, ``0``
or ``1``.
>>> ip_network('192.0.2.1/32').compare_networks(ip_network('192.0.2.2/32'))
-1
>>> ip_network('192.0.2.1/32').compare_networks(ip_network('192.0.2.0/32'))
1
>>> ip_network('192.0.2.1/32').compare_networks(ip_network('192.0.2.1/32'))
0
.. class:: IPv6Network(address, strict=True)
Construct an IPv6 network. *address* is a string or integer representing the
IP address (and optionally the network). An :exc:`AddressValueError` is
raised if *address* is not a valid IPv6 address. A :exc:`NetmaskValueError`
is raised if the netmask is not valid for an IPv6 address.
Construct an IPv6 network definition. *address* can be one of the following:
1. A string consisting of an IP address and an optional mask, separated by
a slash (``/``). The IP addrses is the network address, and the mask
can be either a single number, which means it's a *prefix*, or a string
representation of an IPv6 address. If it's the latter, the mask is
interpreted as a *net mask*. If no mask is provided, it's considered to
be ``/128``.
For example, the following *address* specifications are equivalent:
``2001:db00::0/24`` and ``2001:db00::0/ffff:ff00::``.
2. An integer that fits into 128 bits. This is equivalent to a
single-address network, with the network address being *address* and
the mask being ``/128``.
3. An integer packed into a :class:`bytes` object of length 16, bit-endian.
The interpretation is similar to an integer *address*.
An :exc:`AddressValueError` is raised if *address* is not a valid IPv6
address. A :exc:`NetmaskValueError` is raised if the mask is not valid for
an IPv6 address.
If *strict* is ``True`` and host bits are set in the supplied address,
then :exc:`ValueError` is raised. Otherwise, the host bits are masked out
then :exc:`ValueError` is raised. Otherwise, the host bits are masked out
to determine the appropriate network address.
>>> ipaddress.IPv6Network('2001:db8::/96')
IPv6Network('2001:db8::/96')
>>> ipaddress.IPv6Network('2001:db8::/96').netmask
IPv6Address('ffff:ffff:ffff:ffff:ffff:ffff::')
>>> ipaddress.IPv6Network('2001:db8::1000/96', strict=False)
IPv6Network('2001:db8::/96')
.. describe:: Attributes and methods
All attributes and methods implemented by :class:`IPv4Network` and by
:class:`IPv6Address` are also implemented by :class:`IPv6Network`.
Operators
^^^^^^^^^
Network objects support some operators. Unless stated otherwise, operators can
only be applied between compatible objects (i.e. IPv4 with IPv4, IPv6 with
IPv6).
Logical operators
"""""""""""""""""
Network objects can be compared with the usual set of logical operators,
similarly to address objects.
Iteration
"""""""""
Network objects can be iterated to list all the addresses belonging to the
network. For iteration, *all* hosts are returned, including unusable hosts
(for usable hosts, use the :meth:`~IPv4Network.hosts` method). An
example::
>>> for addr in IPv4Network('192.0.2.0/28'):
... addr
...
IPv4Address('192.0.2.0')
IPv4Address('192.0.2.1')
IPv4Address('192.0.2.2')
IPv4Address('192.0.2.3')
IPv4Address('192.0.2.4')
IPv4Address('192.0.2.5')
IPv4Address('192.0.2.6')
IPv4Address('192.0.2.7')
IPv4Address('192.0.2.8')
IPv4Address('192.0.2.9')
IPv4Address('192.0.2.10')
IPv4Address('192.0.2.11')
IPv4Address('192.0.2.12')
IPv4Address('192.0.2.13')
IPv4Address('192.0.2.14')
IPv4Address('192.0.2.15')
Networks as containers of addresses
"""""""""""""""""""""""""""""""""""
Network objects can act as containers of addresses. Some examples::
>>> IPv4Network('192.0.2.0/28')[0]
IPv4Address('192.0.2.0')
>>> IPv4Network('192.0.2.0/28')[15]
IPv4Address('192.0.2.15')
>>> IPv4Address('192.0.2.6') in IPv4Network('192.0.2.0/28')
True
>>> IPv4Address('192.0.3.6') in IPv4Network('192.0.2.0/28')
False
Interface objects

554
Lib/ipaddress.py
View file

@ -497,6 +497,7 @@ class _IPAddressBase(_TotalOrderingMixin):
prefixlen = self._prefixlen
return self._string_from_ip_int(self._ip_int_from_prefix(prefixlen))
class _BaseAddress(_IPAddressBase):
"""A generic IP object.
@ -568,9 +569,6 @@ class _BaseNetwork(_IPAddressBase):
def __init__(self, address):
self._cache = {}
def __int__(self):
return int(self.network_address)
def __repr__(self):
return '%s(%r)' % (self.__class__.__name__, str(self))
@ -937,6 +935,76 @@ class _BaseNetwork(_IPAddressBase):
strict=False)
return t.__class__('%s/%d' % (t.network_address, t.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)
@property
def is_reserved(self):
"""Test if the address is otherwise IETF reserved.
Returns:
A boolean, True if the address is within one of the
reserved IPv6 Network ranges.
"""
return (self.network_address.is_reserved and
self.broadcast_address.is_reserved)
@property
def is_link_local(self):
"""Test if the address is reserved for link-local.
Returns:
A boolean, True if the address is reserved per RFC 4291.
"""
return (self.network_address.is_link_local and
self.broadcast_address.is_link_local)
@property
def is_private(self):
"""Test if this address is allocated for private networks.
Returns:
A boolean, True if the address is reserved per RFC 4193.
"""
return (self.network_address.is_private and
self.broadcast_address.is_private)
@property
def is_unspecified(self):
"""Test if the address is unspecified.
Returns:
A boolean, True if this is the unspecified address as defined in
RFC 2373 2.5.2.
"""
return (self.network_address.is_unspecified and
self.broadcast_address.is_unspecified)
@property
def is_loopback(self):
"""Test if the address is a loopback address.
Returns:
A boolean, True if the address is a loopback address as defined in
RFC 2373 2.5.3.
"""
return (self.network_address.is_loopback and
self.broadcast_address.is_loopback)
class _BaseV4:
@ -1094,102 +1162,6 @@ class _BaseV4:
def version(self):
return self._version
@property
def is_reserved(self):
"""Test if the address is otherwise IETF reserved.
Returns:
A boolean, True if the address is within the
reserved IPv4 Network range.
"""
reserved_network = IPv4Network('240.0.0.0/4')
if isinstance(self, _BaseAddress):
return self in reserved_network
return (self.network_address in reserved_network and
self.broadcast_address in reserved_network)
@property
def is_private(self):
"""Test if this address is allocated for private networks.
Returns:
A boolean, True if the address is reserved per RFC 1918.
"""
private_10 = IPv4Network('10.0.0.0/8')
private_172 = IPv4Network('172.16.0.0/12')
private_192 = IPv4Network('192.168.0.0/16')
if isinstance(self, _BaseAddress):
return (self in private_10 or self in private_172 or
self in private_192)
else:
return ((self.network_address in private_10 and
self.broadcast_address in private_10) or
(self.network_address in private_172 and
self.broadcast_address in private_172) or
(self.network_address in private_192 and
self.broadcast_address in private_192))
@property
def is_multicast(self):
"""Test if the address is reserved for multicast use.
Returns:
A boolean, True if the address is multicast.
See RFC 3171 for details.
"""
multicast_network = IPv4Network('224.0.0.0/4')
if isinstance(self, _BaseAddress):
return self in IPv4Network('224.0.0.0/4')
return (self.network_address in multicast_network and
self.broadcast_address in multicast_network)
@property
def is_unspecified(self):
"""Test if the address is unspecified.
Returns:
A boolean, True if this is the unspecified address as defined in
RFC 5735 3.
"""
unspecified_address = IPv4Address('0.0.0.0')
if isinstance(self, _BaseAddress):
return self == unspecified_address
return (self.network_address == self.broadcast_address ==
unspecified_address)
@property
def is_loopback(self):
"""Test if the address is a loopback address.
Returns:
A boolean, True if the address is a loopback per RFC 3330.
"""
loopback_address = IPv4Network('127.0.0.0/8')
if isinstance(self, _BaseAddress):
return self in loopback_address
return (self.network_address in loopback_address and
self.broadcast_address in loopback_address)
@property
def is_link_local(self):
"""Test if the address is reserved for link-local.
Returns:
A boolean, True if the address is link-local per RFC 3927.
"""
linklocal_network = IPv4Network('169.254.0.0/16')
if isinstance(self, _BaseAddress):
return self in linklocal_network
return (self.network_address in linklocal_network and
self.broadcast_address in linklocal_network)
class IPv4Address(_BaseV4, _BaseAddress):
@ -1236,6 +1208,79 @@ class IPv4Address(_BaseV4, _BaseAddress):
"""The binary representation of this address."""
return v4_int_to_packed(self._ip)
@property
def is_reserved(self):
"""Test if the address is otherwise IETF reserved.
Returns:
A boolean, True if the address is within the
reserved IPv4 Network range.
"""
reserved_network = IPv4Network('240.0.0.0/4')
return self in reserved_network
@property
def is_private(self):
"""Test if this address is allocated for private networks.
Returns:
A boolean, True if the address is reserved per RFC 1918.
"""
private_10 = IPv4Network('10.0.0.0/8')
private_172 = IPv4Network('172.16.0.0/12')
private_192 = IPv4Network('192.168.0.0/16')
return (self in private_10 or
self in private_172 or
self in private_192)
@property
def is_multicast(self):
"""Test if the address is reserved for multicast use.
Returns:
A boolean, True if the address is multicast.
See RFC 3171 for details.
"""
multicast_network = IPv4Network('224.0.0.0/4')
return self in multicast_network
@property
def is_unspecified(self):
"""Test if the address is unspecified.
Returns:
A boolean, True if this is the unspecified address as defined in
RFC 5735 3.
"""
unspecified_address = IPv4Address('0.0.0.0')
return self == unspecified_address
@property
def is_loopback(self):
"""Test if the address is a loopback address.
Returns:
A boolean, True if the address is a loopback per RFC 3330.
"""
loopback_network = IPv4Network('127.0.0.0/8')
return self in loopback_network
@property
def is_link_local(self):
"""Test if the address is reserved for link-local.
Returns:
A boolean, True if the address is link-local per RFC 3927.
"""
linklocal_network = IPv4Network('169.254.0.0/16')
return self in linklocal_network
class IPv4Interface(IPv4Address):
@ -1674,162 +1719,6 @@ class _BaseV6:
def version(self):
return self._version
@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.
"""
multicast_network = IPv6Network('ff00::/8')
if isinstance(self, _BaseAddress):
return self in multicast_network
return (self.network_address in multicast_network and
self.broadcast_address in multicast_network)
@property
def is_reserved(self):
"""Test if the address is otherwise IETF reserved.
Returns:
A boolean, True if the address is within one of the
reserved IPv6 Network ranges.
"""
reserved_networks = [IPv6Network('::/8'), IPv6Network('100::/8'),
IPv6Network('200::/7'), IPv6Network('400::/6'),
IPv6Network('800::/5'), IPv6Network('1000::/4'),
IPv6Network('4000::/3'), IPv6Network('6000::/3'),
IPv6Network('8000::/3'), IPv6Network('A000::/3'),
IPv6Network('C000::/3'), IPv6Network('E000::/4'),
IPv6Network('F000::/5'), IPv6Network('F800::/6'),
IPv6Network('FE00::/9')]
if isinstance(self, _BaseAddress):
return any(self in x for x in reserved_networks)
return any(self.network_address in x and self.broadcast_address in x
for x in reserved_networks)
@property
def is_link_local(self):
"""Test if the address is reserved for link-local.
Returns:
A boolean, True if the address is reserved per RFC 4291.
"""
linklocal_network = IPv6Network('fe80::/10')
if isinstance(self, _BaseAddress):
return self in linklocal_network
return (self.network_address in linklocal_network and
self.broadcast_address in linklocal_network)
@property
def is_site_local(self):
"""Test if the address is reserved for site-local.
Note that the site-local address space has been deprecated by RFC 3879.
Use is_private to test if this address is in the space of unique local
addresses as defined by RFC 4193.
Returns:
A boolean, True if the address is reserved per RFC 3513 2.5.6.
"""
sitelocal_network = IPv6Network('fec0::/10')
if isinstance(self, _BaseAddress):
return self in sitelocal_network
return (self.network_address in sitelocal_network and
self.broadcast_address in sitelocal_network)
@property
def is_private(self):
"""Test if this address is allocated for private networks.
Returns:
A boolean, True if the address is reserved per RFC 4193.
"""
private_network = IPv6Network('fc00::/7')
if isinstance(self, _BaseAddress):
return self in private_network
return (self.network_address in private_network and
self.broadcast_address in private_network)
@property
def ipv4_mapped(self):
"""Return the IPv4 mapped address.
Returns:
If the IPv6 address is a v4 mapped address, return the
IPv4 mapped address. Return None otherwise.
"""
if (self._ip >> 32) != 0xFFFF:
return None
return IPv4Address(self._ip & 0xFFFFFFFF)
@property
def teredo(self):
"""Tuple of embedded teredo IPs.
Returns:
Tuple of the (server, client) IPs or None if the address
doesn't appear to be a teredo address (doesn't start with
2001::/32)
"""
if (self._ip >> 96) != 0x20010000:
return None
return (IPv4Address((self._ip >> 64) & 0xFFFFFFFF),
IPv4Address(~self._ip & 0xFFFFFFFF))
@property
def sixtofour(self):
"""Return the IPv4 6to4 embedded address.
Returns:
The IPv4 6to4-embedded address if present or None if the
address doesn't appear to contain a 6to4 embedded address.
"""
if (self._ip >> 112) != 0x2002:
return None
return IPv4Address((self._ip >> 80) & 0xFFFFFFFF)
@property
def is_unspecified(self):
"""Test if the address is unspecified.
Returns:
A boolean, True if this is the unspecified address as defined in
RFC 2373 2.5.2.
"""
if isinstance(self, (IPv6Network, IPv6Interface)):
return int(self.network_address) == 0 and getattr(
self, '_prefixlen', 128) == 128
return self._ip == 0
@property
def is_loopback(self):
"""Test if the address is a loopback address.
Returns:
A boolean, True if the address is a loopback address as defined in
RFC 2373 2.5.3.
"""
if isinstance(self, IPv6Network):
return int(self) == 1 and getattr(
self, '_prefixlen', 128) == 128
elif isinstance(self, IPv6Interface):
return int(self.network.network_address) == 1 and getattr(
self, '_prefixlen', 128) == 128
return self._ip == 1
class IPv6Address(_BaseV6, _BaseAddress):
@ -1878,6 +1767,138 @@ class IPv6Address(_BaseV6, _BaseAddress):
"""The binary representation of this address."""
return v6_int_to_packed(self._ip)
@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.
"""
multicast_network = IPv6Network('ff00::/8')
return self in multicast_network
@property
def is_reserved(self):
"""Test if the address is otherwise IETF reserved.
Returns:
A boolean, True if the address is within one of the
reserved IPv6 Network ranges.
"""
reserved_networks = [IPv6Network('::/8'), IPv6Network('100::/8'),
IPv6Network('200::/7'), IPv6Network('400::/6'),
IPv6Network('800::/5'), IPv6Network('1000::/4'),
IPv6Network('4000::/3'), IPv6Network('6000::/3'),
IPv6Network('8000::/3'), IPv6Network('A000::/3'),
IPv6Network('C000::/3'), IPv6Network('E000::/4'),
IPv6Network('F000::/5'), IPv6Network('F800::/6'),
IPv6Network('FE00::/9')]
return any(self in x for x in reserved_networks)
@property
def is_link_local(self):
"""Test if the address is reserved for link-local.
Returns:
A boolean, True if the address is reserved per RFC 4291.
"""
linklocal_network = IPv6Network('fe80::/10')
return self in linklocal_network
@property
def is_site_local(self):
"""Test if the address is reserved for site-local.
Note that the site-local address space has been deprecated by RFC 3879.
Use is_private to test if this address is in the space of unique local
addresses as defined by RFC 4193.
Returns:
A boolean, True if the address is reserved per RFC 3513 2.5.6.
"""
sitelocal_network = IPv6Network('fec0::/10')
return self in sitelocal_network
@property
def is_private(self):
"""Test if this address is allocated for private networks.
Returns:
A boolean, True if the address is reserved per RFC 4193.
"""
private_network = IPv6Network('fc00::/7')
return self in private_network
@property
def is_unspecified(self):
"""Test if the address is unspecified.
Returns:
A boolean, True if this is the unspecified address as defined in
RFC 2373 2.5.2.
"""
return self._ip == 0
@property
def is_loopback(self):
"""Test if the address is a loopback address.
Returns:
A boolean, True if the address is a loopback address as defined in
RFC 2373 2.5.3.
"""
return self._ip == 1
@property
def ipv4_mapped(self):
"""Return the IPv4 mapped address.
Returns:
If the IPv6 address is a v4 mapped address, return the
IPv4 mapped address. Return None otherwise.
"""
if (self._ip >> 32) != 0xFFFF:
return None
return IPv4Address(self._ip & 0xFFFFFFFF)
@property
def teredo(self):
"""Tuple of embedded teredo IPs.
Returns:
Tuple of the (server, client) IPs or None if the address
doesn't appear to be a teredo address (doesn't start with
2001::/32)
"""
if (self._ip >> 96) != 0x20010000:
return None
return (IPv4Address((self._ip >> 64) & 0xFFFFFFFF),
IPv4Address(~self._ip & 0xFFFFFFFF))
@property
def sixtofour(self):
"""Return the IPv4 6to4 embedded address.
Returns:
The IPv4 6to4-embedded address if present or None if the
address doesn't appear to contain a 6to4 embedded address.
"""
if (self._ip >> 112) != 0x2002:
return None
return IPv4Address((self._ip >> 80) & 0xFFFFFFFF)
class IPv6Interface(IPv6Address):
@ -1946,6 +1967,14 @@ class IPv6Interface(IPv6Address):
return '%s/%s' % (self._string_from_ip_int(self._ip),
self.hostmask)
@property
def is_unspecified(self):
return self._ip == 0 and self.network.is_unspecified
@property
def is_loopback(self):
return self._ip == 1 and self.network.is_loopback
class IPv6Network(_BaseV6, _BaseNetwork):
@ -2054,3 +2083,18 @@ class IPv6Network(_BaseV6, _BaseNetwork):
except ValueError:
return False
return 0 <= prefixlen <= self._max_prefixlen
@property
def is_site_local(self):
"""Test if the address is reserved for site-local.
Note that the site-local address space has been deprecated by RFC 3879.
Use is_private to test if this address is in the space of unique local
addresses as defined by RFC 4193.
Returns:
A boolean, True if the address is reserved per RFC 3513 2.5.6.
"""
return (self.network_address.is_site_local and
self.broadcast_address.is_site_local)

4
Lib/test/test_ipaddress.py
View file

@ -647,8 +647,8 @@ class IpaddrUnitTest(unittest.TestCase):
ipv4 = ipaddress.ip_network('1.2.3.4')
ipv6 = ipaddress.ip_network('2001:658:22a:cafe:200:0:0:1')
self.assertEqual(ipv4, ipaddress.ip_network(int(ipv4)))
self.assertEqual(ipv6, ipaddress.ip_network(int(ipv6)))
self.assertEqual(ipv4, ipaddress.ip_network(int(ipv4.network_address)))
self.assertEqual(ipv6, ipaddress.ip_network(int(ipv6.network_address)))
v6_int = 42540616829182469433547762482097946625
self.assertEqual(self.ipv6_interface._ip,