2290 lines
74 KiB
Python
2290 lines
74 KiB
Python
# Copyright 2007 Google Inc.
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# Licensed to PSF under a Contributor Agreement.
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"""A fast, lightweight IPv4/IPv6 manipulation library in Python.
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This library is used to create/poke/manipulate IPv4 and IPv6 addresses
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and networks.
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"""
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__version__ = '1.0'
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import functools
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IPV4LENGTH = 32
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IPV6LENGTH = 128
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class AddressValueError(ValueError):
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"""A Value Error related to the address."""
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class NetmaskValueError(ValueError):
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"""A Value Error related to the netmask."""
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def ip_address(address):
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"""Take an IP string/int and return an object of the correct type.
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Args:
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address: A string or integer, the IP address. Either IPv4 or
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IPv6 addresses may be supplied; integers less than 2**32 will
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be considered to be IPv4 by default.
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Returns:
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An IPv4Address or IPv6Address object.
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Raises:
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ValueError: if the *address* passed isn't either a v4 or a v6
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address
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"""
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try:
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return IPv4Address(address)
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except (AddressValueError, NetmaskValueError):
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pass
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try:
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return IPv6Address(address)
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except (AddressValueError, NetmaskValueError):
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pass
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raise ValueError('%r does not appear to be an IPv4 or IPv6 address' %
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address)
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def ip_network(address, strict=True):
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"""Take an IP string/int and return an object of the correct type.
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Args:
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address: A string or integer, the IP network. Either IPv4 or
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IPv6 networks may be supplied; integers less than 2**32 will
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be considered to be IPv4 by default.
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Returns:
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An IPv4Network or IPv6Network object.
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Raises:
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ValueError: if the string passed isn't either a v4 or a v6
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address. Or if the network has host bits set.
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"""
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try:
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return IPv4Network(address, strict)
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except (AddressValueError, NetmaskValueError):
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pass
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try:
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return IPv6Network(address, strict)
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except (AddressValueError, NetmaskValueError):
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pass
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raise ValueError('%r does not appear to be an IPv4 or IPv6 network' %
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address)
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def ip_interface(address):
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"""Take an IP string/int and return an object of the correct type.
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Args:
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address: A string or integer, the IP address. Either IPv4 or
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IPv6 addresses may be supplied; integers less than 2**32 will
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be considered to be IPv4 by default.
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Returns:
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An IPv4Interface or IPv6Interface object.
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Raises:
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ValueError: if the string passed isn't either a v4 or a v6
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address.
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Notes:
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The IPv?Interface classes describe an Address on a particular
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Network, so they're basically a combination of both the Address
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and Network classes.
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"""
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try:
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return IPv4Interface(address)
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except (AddressValueError, NetmaskValueError):
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pass
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try:
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return IPv6Interface(address)
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except (AddressValueError, NetmaskValueError):
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pass
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raise ValueError('%r does not appear to be an IPv4 or IPv6 interface' %
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address)
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def v4_int_to_packed(address):
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"""Represent an address as 4 packed bytes in network (big-endian) order.
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Args:
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address: An integer representation of an IPv4 IP address.
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Returns:
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The integer address packed as 4 bytes in network (big-endian) order.
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Raises:
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ValueError: If the integer is negative or too large to be an
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IPv4 IP address.
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"""
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try:
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return address.to_bytes(4, 'big')
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except OverflowError:
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raise ValueError("Address negative or too large for IPv4")
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def v6_int_to_packed(address):
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"""Represent an address as 16 packed bytes in network (big-endian) order.
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Args:
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address: An integer representation of an IPv6 IP address.
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Returns:
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The integer address packed as 16 bytes in network (big-endian) order.
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"""
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try:
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return address.to_bytes(16, 'big')
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except OverflowError:
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raise ValueError("Address negative or too large for IPv6")
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def _split_optional_netmask(address):
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"""Helper to split the netmask and raise AddressValueError if needed"""
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addr = str(address).split('/')
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if len(addr) > 2:
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raise AddressValueError("Only one '/' permitted in %r" % address)
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return addr
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def _find_address_range(addresses):
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"""Find a sequence of sorted deduplicated IPv#Address.
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Args:
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addresses: a list of IPv#Address objects.
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Yields:
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A tuple containing the first and last IP addresses in the sequence.
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"""
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it = iter(addresses)
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first = last = next(it)
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for ip in it:
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if ip._ip != last._ip + 1:
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yield first, last
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first = ip
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last = ip
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yield first, last
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def _count_righthand_zero_bits(number, bits):
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"""Count the number of zero bits on the right hand side.
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Args:
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number: an integer.
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bits: maximum number of bits to count.
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Returns:
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The number of zero bits on the right hand side of the number.
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"""
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if number == 0:
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return bits
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return min(bits, (~number & (number-1)).bit_length())
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def summarize_address_range(first, last):
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"""Summarize a network range given the first and last IP addresses.
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Example:
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>>> list(summarize_address_range(IPv4Address('192.0.2.0'),
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... IPv4Address('192.0.2.130')))
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... #doctest: +NORMALIZE_WHITESPACE
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[IPv4Network('192.0.2.0/25'), IPv4Network('192.0.2.128/31'),
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IPv4Network('192.0.2.130/32')]
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Args:
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first: the first IPv4Address or IPv6Address in the range.
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last: the last IPv4Address or IPv6Address in the range.
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Returns:
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An iterator of the summarized IPv(4|6) network objects.
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Raise:
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TypeError:
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If the first and last objects are not IP addresses.
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If the first and last objects are not the same version.
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ValueError:
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If the last object is not greater than the first.
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If the version of the first address is not 4 or 6.
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"""
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if (not (isinstance(first, _BaseAddress) and
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isinstance(last, _BaseAddress))):
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raise TypeError('first and last must be IP addresses, not networks')
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if first.version != last.version:
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raise TypeError("%s and %s are not of the same version" % (
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first, last))
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if first > last:
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raise ValueError('last IP address must be greater than first')
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if first.version == 4:
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ip = IPv4Network
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elif first.version == 6:
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ip = IPv6Network
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else:
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raise ValueError('unknown IP version')
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ip_bits = first._max_prefixlen
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first_int = first._ip
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last_int = last._ip
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while first_int <= last_int:
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nbits = min(_count_righthand_zero_bits(first_int, ip_bits),
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(last_int - first_int + 1).bit_length() - 1)
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net = ip((first_int, ip_bits - nbits))
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yield net
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first_int += 1 << nbits
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if first_int - 1 == ip._ALL_ONES:
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break
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def _collapse_addresses_internal(addresses):
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"""Loops through the addresses, collapsing concurrent netblocks.
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Example:
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ip1 = IPv4Network('192.0.2.0/26')
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ip2 = IPv4Network('192.0.2.64/26')
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ip3 = IPv4Network('192.0.2.128/26')
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ip4 = IPv4Network('192.0.2.192/26')
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_collapse_addresses_internal([ip1, ip2, ip3, ip4]) ->
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[IPv4Network('192.0.2.0/24')]
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This shouldn't be called directly; it is called via
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collapse_addresses([]).
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Args:
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addresses: A list of IPv4Network's or IPv6Network's
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Returns:
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A list of IPv4Network's or IPv6Network's depending on what we were
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passed.
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"""
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# First merge
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to_merge = list(addresses)
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subnets = {}
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while to_merge:
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net = to_merge.pop()
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supernet = net.supernet()
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existing = subnets.get(supernet)
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if existing is None:
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subnets[supernet] = net
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elif existing != net:
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# Merge consecutive subnets
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del subnets[supernet]
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to_merge.append(supernet)
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# Then iterate over resulting networks, skipping subsumed subnets
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last = None
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for net in sorted(subnets.values()):
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if last is not None:
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# Since they are sorted, last.network_address <= net.network_address
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# is a given.
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if last.broadcast_address >= net.broadcast_address:
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continue
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yield net
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last = net
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def collapse_addresses(addresses):
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"""Collapse a list of IP objects.
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Example:
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collapse_addresses([IPv4Network('192.0.2.0/25'),
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IPv4Network('192.0.2.128/25')]) ->
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[IPv4Network('192.0.2.0/24')]
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Args:
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addresses: An iterator of IPv4Network or IPv6Network objects.
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Returns:
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An iterator of the collapsed IPv(4|6)Network objects.
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Raises:
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TypeError: If passed a list of mixed version objects.
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"""
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addrs = []
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ips = []
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nets = []
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# split IP addresses and networks
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for ip in addresses:
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if isinstance(ip, _BaseAddress):
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if ips and ips[-1]._version != ip._version:
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raise TypeError("%s and %s are not of the same version" % (
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ip, ips[-1]))
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ips.append(ip)
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elif ip._prefixlen == ip._max_prefixlen:
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if ips and ips[-1]._version != ip._version:
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raise TypeError("%s and %s are not of the same version" % (
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ip, ips[-1]))
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try:
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ips.append(ip.ip)
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except AttributeError:
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ips.append(ip.network_address)
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else:
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if nets and nets[-1]._version != ip._version:
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raise TypeError("%s and %s are not of the same version" % (
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ip, nets[-1]))
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nets.append(ip)
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# sort and dedup
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ips = sorted(set(ips))
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# find consecutive address ranges in the sorted sequence and summarize them
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if ips:
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for first, last in _find_address_range(ips):
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addrs.extend(summarize_address_range(first, last))
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return _collapse_addresses_internal(addrs + nets)
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def get_mixed_type_key(obj):
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"""Return a key suitable for sorting between networks and addresses.
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Address and Network objects are not sortable by default; they're
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fundamentally different so the expression
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IPv4Address('192.0.2.0') <= IPv4Network('192.0.2.0/24')
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doesn't make any sense. There are some times however, where you may wish
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to have ipaddress sort these for you anyway. If you need to do this, you
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can use this function as the key= argument to sorted().
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Args:
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obj: either a Network or Address object.
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Returns:
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appropriate key.
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"""
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if isinstance(obj, _BaseNetwork):
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return obj._get_networks_key()
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elif isinstance(obj, _BaseAddress):
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return obj._get_address_key()
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return NotImplemented
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class _IPAddressBase:
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"""The mother class."""
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__slots__ = ()
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@property
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def exploded(self):
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"""Return the longhand version of the IP address as a string."""
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return self._explode_shorthand_ip_string()
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@property
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def compressed(self):
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"""Return the shorthand version of the IP address as a string."""
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return str(self)
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@property
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def reverse_pointer(self):
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"""The name of the reverse DNS pointer for the IP address, e.g.:
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>>> ipaddress.ip_address("127.0.0.1").reverse_pointer
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'1.0.0.127.in-addr.arpa'
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>>> ipaddress.ip_address("2001:db8::1").reverse_pointer
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'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'
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"""
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return self._reverse_pointer()
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@property
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def version(self):
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msg = '%200s has no version specified' % (type(self),)
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raise NotImplementedError(msg)
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def _check_int_address(self, address):
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if address < 0:
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msg = "%d (< 0) is not permitted as an IPv%d address"
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raise AddressValueError(msg % (address, self._version))
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if address > self._ALL_ONES:
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msg = "%d (>= 2**%d) is not permitted as an IPv%d address"
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raise AddressValueError(msg % (address, self._max_prefixlen,
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self._version))
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def _check_packed_address(self, address, expected_len):
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address_len = len(address)
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if address_len != expected_len:
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msg = "%r (len %d != %d) is not permitted as an IPv%d address"
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raise AddressValueError(msg % (address, address_len,
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expected_len, self._version))
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@classmethod
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def _ip_int_from_prefix(cls, prefixlen):
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"""Turn the prefix length into a bitwise netmask
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Args:
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prefixlen: An integer, the prefix length.
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Returns:
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An integer.
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"""
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return cls._ALL_ONES ^ (cls._ALL_ONES >> prefixlen)
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@classmethod
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def _prefix_from_ip_int(cls, ip_int):
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"""Return prefix length from the bitwise netmask.
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Args:
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ip_int: An integer, the netmask in expanded bitwise format
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Returns:
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An integer, the prefix length.
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Raises:
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ValueError: If the input intermingles zeroes & ones
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"""
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trailing_zeroes = _count_righthand_zero_bits(ip_int,
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cls._max_prefixlen)
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prefixlen = cls._max_prefixlen - trailing_zeroes
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leading_ones = ip_int >> trailing_zeroes
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all_ones = (1 << prefixlen) - 1
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if leading_ones != all_ones:
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byteslen = cls._max_prefixlen // 8
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details = ip_int.to_bytes(byteslen, 'big')
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msg = 'Netmask pattern %r mixes zeroes & ones'
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raise ValueError(msg % details)
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return prefixlen
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@classmethod
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def _report_invalid_netmask(cls, netmask_str):
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msg = '%r is not a valid netmask' % netmask_str
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raise NetmaskValueError(msg) from None
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@classmethod
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def _prefix_from_prefix_string(cls, prefixlen_str):
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"""Return prefix length from a numeric string
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Args:
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prefixlen_str: The string to be converted
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Returns:
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An integer, the prefix length.
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Raises:
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NetmaskValueError: If the input is not a valid netmask
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"""
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# int allows a leading +/- as well as surrounding whitespace,
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# so we ensure that isn't the case
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if not _BaseV4._DECIMAL_DIGITS.issuperset(prefixlen_str):
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cls._report_invalid_netmask(prefixlen_str)
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try:
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prefixlen = int(prefixlen_str)
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except ValueError:
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cls._report_invalid_netmask(prefixlen_str)
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if not (0 <= prefixlen <= cls._max_prefixlen):
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cls._report_invalid_netmask(prefixlen_str)
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return prefixlen
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@classmethod
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def _prefix_from_ip_string(cls, ip_str):
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"""Turn a netmask/hostmask string into a prefix length
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Args:
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ip_str: The netmask/hostmask to be converted
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Returns:
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An integer, the prefix length.
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Raises:
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NetmaskValueError: If the input is not a valid netmask/hostmask
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"""
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# Parse the netmask/hostmask like an IP address.
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try:
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ip_int = cls._ip_int_from_string(ip_str)
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except AddressValueError:
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cls._report_invalid_netmask(ip_str)
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# Try matching a netmask (this would be /1*0*/ as a bitwise regexp).
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# Note that the two ambiguous cases (all-ones and all-zeroes) are
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# treated as netmasks.
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try:
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return cls._prefix_from_ip_int(ip_int)
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except ValueError:
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pass
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# Invert the bits, and try matching a /0+1+/ hostmask instead.
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ip_int ^= cls._ALL_ONES
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try:
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return cls._prefix_from_ip_int(ip_int)
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except ValueError:
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cls._report_invalid_netmask(ip_str)
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def __reduce__(self):
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return self.__class__, (str(self),)
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@functools.total_ordering
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class _BaseAddress(_IPAddressBase):
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"""A generic IP object.
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This IP class contains the version independent methods which are
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used by single IP addresses.
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"""
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__slots__ = ()
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def __int__(self):
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return self._ip
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def __eq__(self, other):
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try:
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return (self._ip == other._ip
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and self._version == other._version)
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except AttributeError:
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return NotImplemented
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def __lt__(self, other):
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if not isinstance(other, _BaseAddress):
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return NotImplemented
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if self._version != other._version:
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raise TypeError('%s and %s are not of the same version' % (
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self, other))
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if self._ip != other._ip:
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return self._ip < other._ip
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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 __init__(self, address):
|
|
self._cache = {}
|
|
|
|
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
|
|
return self._address_class(network + n)
|
|
else:
|
|
n += 1
|
|
if broadcast + n < network:
|
|
raise IndexError
|
|
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)))
|
|
|
|
@property
|
|
def broadcast_address(self):
|
|
x = self._cache.get('broadcast_address')
|
|
if x is None:
|
|
x = self._address_class(int(self.network_address) |
|
|
int(self.hostmask))
|
|
self._cache['broadcast_address'] = x
|
|
return x
|
|
|
|
@property
|
|
def hostmask(self):
|
|
x = self._cache.get('hostmask')
|
|
if x is None:
|
|
x = self._address_class(int(self.netmask) ^ self._ALL_ONES)
|
|
self._cache['hostmask'] = x
|
|
return x
|
|
|
|
@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')
|
|
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')
|
|
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.network_address >= self.network_address and
|
|
other.broadcast_address <= self.broadcast_address):
|
|
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.network_address >= s1.network_address and
|
|
other.broadcast_address <= s1.broadcast_address):
|
|
yield s2
|
|
s1, s2 = s1.subnets()
|
|
elif (other.network_address >= s2.network_address and
|
|
other.broadcast_address <= s2.broadcast_address):
|
|
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)
|
|
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)
|
|
|
|
@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
|
|
iana-ipv4-special-registry or iana-ipv6-special-registry.
|
|
|
|
"""
|
|
return (self.network_address.is_private and
|
|
self.broadcast_address.is_private)
|
|
|
|
@property
|
|
def is_global(self):
|
|
"""Test if this address is allocated for public networks.
|
|
|
|
Returns:
|
|
A boolean, True if the address is not reserved per
|
|
iana-ipv4-special-registry or iana-ipv6-special-registry.
|
|
|
|
"""
|
|
return not self.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:
|
|
|
|
"""Base IPv4 object.
|
|
|
|
The following methods are used by IPv4 objects in both single IP
|
|
addresses and networks.
|
|
|
|
"""
|
|
|
|
__slots__ = ()
|
|
_version = 4
|
|
# Equivalent to 255.255.255.255 or 32 bits of 1's.
|
|
_ALL_ONES = (2**IPV4LENGTH) - 1
|
|
_DECIMAL_DIGITS = frozenset('0123456789')
|
|
|
|
# the valid octets for host and netmasks. only useful for IPv4.
|
|
_valid_mask_octets = frozenset({255, 254, 252, 248, 240, 224, 192, 128, 0})
|
|
|
|
_max_prefixlen = IPV4LENGTH
|
|
# There are only a handful of valid v4 netmasks, so we cache them all
|
|
# when constructed (see _make_netmask()).
|
|
_netmask_cache = {}
|
|
|
|
def _explode_shorthand_ip_string(self):
|
|
return str(self)
|
|
|
|
@classmethod
|
|
def _make_netmask(cls, arg):
|
|
"""Make a (netmask, prefix_len) tuple from the given argument.
|
|
|
|
Argument can be:
|
|
- an integer (the prefix length)
|
|
- a string representing the prefix length (e.g. "24")
|
|
- a string representing the prefix netmask (e.g. "255.255.255.0")
|
|
"""
|
|
if arg not in cls._netmask_cache:
|
|
if isinstance(arg, int):
|
|
prefixlen = arg
|
|
else:
|
|
try:
|
|
# Check for a netmask in prefix length form
|
|
prefixlen = cls._prefix_from_prefix_string(arg)
|
|
except NetmaskValueError:
|
|
# Check for a netmask or hostmask in dotted-quad form.
|
|
# This may raise NetmaskValueError.
|
|
prefixlen = cls._prefix_from_ip_string(arg)
|
|
netmask = IPv4Address(cls._ip_int_from_prefix(prefixlen))
|
|
cls._netmask_cache[arg] = netmask, prefixlen
|
|
return cls._netmask_cache[arg]
|
|
|
|
@classmethod
|
|
def _ip_int_from_string(cls, ip_str):
|
|
"""Turn the given IP string into an integer for comparison.
|
|
|
|
Args:
|
|
ip_str: A string, the IP ip_str.
|
|
|
|
Returns:
|
|
The IP ip_str as an integer.
|
|
|
|
Raises:
|
|
AddressValueError: if ip_str isn't a valid IPv4 Address.
|
|
|
|
"""
|
|
if not ip_str:
|
|
raise AddressValueError('Address cannot be empty')
|
|
|
|
octets = ip_str.split('.')
|
|
if len(octets) != 4:
|
|
raise AddressValueError("Expected 4 octets in %r" % ip_str)
|
|
|
|
try:
|
|
return int.from_bytes(map(cls._parse_octet, octets), 'big')
|
|
except ValueError as exc:
|
|
raise AddressValueError("%s in %r" % (exc, ip_str)) from None
|
|
|
|
@classmethod
|
|
def _parse_octet(cls, octet_str):
|
|
"""Convert a decimal octet into an integer.
|
|
|
|
Args:
|
|
octet_str: A string, the number to parse.
|
|
|
|
Returns:
|
|
The octet as an integer.
|
|
|
|
Raises:
|
|
ValueError: if the octet isn't strictly a decimal from [0..255].
|
|
|
|
"""
|
|
if not octet_str:
|
|
raise ValueError("Empty octet not permitted")
|
|
# Whitelist the characters, since int() allows a lot of bizarre stuff.
|
|
if not cls._DECIMAL_DIGITS.issuperset(octet_str):
|
|
msg = "Only decimal digits permitted in %r"
|
|
raise ValueError(msg % octet_str)
|
|
# We do the length check second, since the invalid character error
|
|
# is likely to be more informative for the user
|
|
if len(octet_str) > 3:
|
|
msg = "At most 3 characters permitted in %r"
|
|
raise ValueError(msg % octet_str)
|
|
# Convert to integer (we know digits are legal)
|
|
octet_int = int(octet_str, 10)
|
|
# Any octets that look like they *might* be written in octal,
|
|
# and which don't look exactly the same in both octal and
|
|
# decimal are rejected as ambiguous
|
|
if octet_int > 7 and octet_str[0] == '0':
|
|
msg = "Ambiguous (octal/decimal) value in %r not permitted"
|
|
raise ValueError(msg % octet_str)
|
|
if octet_int > 255:
|
|
raise ValueError("Octet %d (> 255) not permitted" % octet_int)
|
|
return octet_int
|
|
|
|
@classmethod
|
|
def _string_from_ip_int(cls, ip_int):
|
|
"""Turns a 32-bit integer into dotted decimal notation.
|
|
|
|
Args:
|
|
ip_int: An integer, the IP address.
|
|
|
|
Returns:
|
|
The IP address as a string in dotted decimal notation.
|
|
|
|
"""
|
|
return '.'.join(map(str, ip_int.to_bytes(4, 'big')))
|
|
|
|
def _is_valid_netmask(self, netmask):
|
|
"""Verify that the netmask is valid.
|
|
|
|
Args:
|
|
netmask: A string, either a prefix or dotted decimal
|
|
netmask.
|
|
|
|
Returns:
|
|
A boolean, True if the prefix represents a valid IPv4
|
|
netmask.
|
|
|
|
"""
|
|
mask = netmask.split('.')
|
|
if len(mask) == 4:
|
|
try:
|
|
for x in mask:
|
|
if int(x) not in self._valid_mask_octets:
|
|
return False
|
|
except ValueError:
|
|
# Found something that isn't an integer or isn't valid
|
|
return False
|
|
for idx, y in enumerate(mask):
|
|
if idx > 0 and y > mask[idx - 1]:
|
|
return False
|
|
return True
|
|
try:
|
|
netmask = int(netmask)
|
|
except ValueError:
|
|
return False
|
|
return 0 <= netmask <= self._max_prefixlen
|
|
|
|
def _is_hostmask(self, ip_str):
|
|
"""Test if the IP string is a hostmask (rather than a netmask).
|
|
|
|
Args:
|
|
ip_str: A string, the potential hostmask.
|
|
|
|
Returns:
|
|
A boolean, True if the IP string is a hostmask.
|
|
|
|
"""
|
|
bits = ip_str.split('.')
|
|
try:
|
|
parts = [x for x in map(int, bits) if x in self._valid_mask_octets]
|
|
except ValueError:
|
|
return False
|
|
if len(parts) != len(bits):
|
|
return False
|
|
if parts[0] < parts[-1]:
|
|
return True
|
|
return False
|
|
|
|
def _reverse_pointer(self):
|
|
"""Return the reverse DNS pointer name for the IPv4 address.
|
|
|
|
This implements the method described in RFC1035 3.5.
|
|
|
|
"""
|
|
reverse_octets = str(self).split('.')[::-1]
|
|
return '.'.join(reverse_octets) + '.in-addr.arpa'
|
|
|
|
@property
|
|
def max_prefixlen(self):
|
|
return self._max_prefixlen
|
|
|
|
@property
|
|
def version(self):
|
|
return self._version
|
|
|
|
|
|
class IPv4Address(_BaseV4, _BaseAddress):
|
|
|
|
"""Represent and manipulate single IPv4 Addresses."""
|
|
|
|
__slots__ = ('_ip', '__weakref__')
|
|
|
|
def __init__(self, address):
|
|
|
|
"""
|
|
Args:
|
|
address: A string or integer representing the IP
|
|
|
|
Additionally, an integer can be passed, so
|
|
IPv4Address('192.0.2.1') == IPv4Address(3221225985).
|
|
or, more generally
|
|
IPv4Address(int(IPv4Address('192.0.2.1'))) ==
|
|
IPv4Address('192.0.2.1')
|
|
|
|
Raises:
|
|
AddressValueError: If ipaddress isn't a valid IPv4 address.
|
|
|
|
"""
|
|
# Efficient constructor from integer.
|
|
if isinstance(address, int):
|
|
self._check_int_address(address)
|
|
self._ip = address
|
|
return
|
|
|
|
# Constructing from a packed address
|
|
if isinstance(address, bytes):
|
|
self._check_packed_address(address, 4)
|
|
self._ip = int.from_bytes(address, 'big')
|
|
return
|
|
|
|
# Assume input argument to be string or any object representation
|
|
# which converts into a formatted IP string.
|
|
addr_str = str(address)
|
|
if '/' in addr_str:
|
|
raise AddressValueError("Unexpected '/' in %r" % address)
|
|
self._ip = self._ip_int_from_string(addr_str)
|
|
|
|
@property
|
|
def packed(self):
|
|
"""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.
|
|
|
|
"""
|
|
return self in self._constants._reserved_network
|
|
|
|
@property
|
|
@functools.lru_cache()
|
|
def is_private(self):
|
|
"""Test if this address is allocated for private networks.
|
|
|
|
Returns:
|
|
A boolean, True if the address is reserved per
|
|
iana-ipv4-special-registry.
|
|
|
|
"""
|
|
return any(self in net for net in self._constants._private_networks)
|
|
|
|
@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.
|
|
|
|
"""
|
|
return self in self._constants._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.
|
|
|
|
"""
|
|
return self == self._constants._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.
|
|
|
|
"""
|
|
return self in self._constants._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.
|
|
|
|
"""
|
|
return self in self._constants._linklocal_network
|
|
|
|
|
|
class IPv4Interface(IPv4Address):
|
|
|
|
def __init__(self, address):
|
|
if isinstance(address, (bytes, int)):
|
|
IPv4Address.__init__(self, address)
|
|
self.network = IPv4Network(self._ip)
|
|
self._prefixlen = self._max_prefixlen
|
|
return
|
|
|
|
if isinstance(address, tuple):
|
|
IPv4Address.__init__(self, address[0])
|
|
if len(address) > 1:
|
|
self._prefixlen = int(address[1])
|
|
else:
|
|
self._prefixlen = self._max_prefixlen
|
|
|
|
self.network = IPv4Network(address, strict=False)
|
|
self.netmask = self.network.netmask
|
|
self.hostmask = self.network.hostmask
|
|
return
|
|
|
|
addr = _split_optional_netmask(address)
|
|
IPv4Address.__init__(self, addr[0])
|
|
|
|
self.network = IPv4Network(address, strict=False)
|
|
self._prefixlen = self.network._prefixlen
|
|
|
|
self.netmask = self.network.netmask
|
|
self.hostmask = self.network.hostmask
|
|
|
|
def __str__(self):
|
|
return '%s/%d' % (self._string_from_ip_int(self._ip),
|
|
self.network.prefixlen)
|
|
|
|
def __eq__(self, other):
|
|
address_equal = IPv4Address.__eq__(self, other)
|
|
if not address_equal or address_equal is NotImplemented:
|
|
return address_equal
|
|
try:
|
|
return self.network == other.network
|
|
except AttributeError:
|
|
# An interface with an associated network is NOT the
|
|
# same as an unassociated address. That's why the hash
|
|
# takes the extra info into account.
|
|
return False
|
|
|
|
def __lt__(self, other):
|
|
address_less = IPv4Address.__lt__(self, other)
|
|
if address_less is NotImplemented:
|
|
return NotImplemented
|
|
try:
|
|
return self.network < other.network
|
|
except AttributeError:
|
|
# We *do* allow addresses and interfaces to be sorted. The
|
|
# unassociated address is considered less than all interfaces.
|
|
return False
|
|
|
|
def __hash__(self):
|
|
return self._ip ^ self._prefixlen ^ int(self.network.network_address)
|
|
|
|
__reduce__ = _IPAddressBase.__reduce__
|
|
|
|
@property
|
|
def ip(self):
|
|
return IPv4Address(self._ip)
|
|
|
|
@property
|
|
def with_prefixlen(self):
|
|
return '%s/%s' % (self._string_from_ip_int(self._ip),
|
|
self._prefixlen)
|
|
|
|
@property
|
|
def with_netmask(self):
|
|
return '%s/%s' % (self._string_from_ip_int(self._ip),
|
|
self.netmask)
|
|
|
|
@property
|
|
def with_hostmask(self):
|
|
return '%s/%s' % (self._string_from_ip_int(self._ip),
|
|
self.hostmask)
|
|
|
|
|
|
class IPv4Network(_BaseV4, _BaseNetwork):
|
|
|
|
"""This class represents and manipulates 32-bit IPv4 network + addresses..
|
|
|
|
Attributes: [examples for IPv4Network('192.0.2.0/27')]
|
|
.network_address: IPv4Address('192.0.2.0')
|
|
.hostmask: IPv4Address('0.0.0.31')
|
|
.broadcast_address: IPv4Address('192.0.2.32')
|
|
.netmask: IPv4Address('255.255.255.224')
|
|
.prefixlen: 27
|
|
|
|
"""
|
|
# Class to use when creating address objects
|
|
_address_class = IPv4Address
|
|
|
|
def __init__(self, address, strict=True):
|
|
|
|
"""Instantiate a new IPv4 network object.
|
|
|
|
Args:
|
|
address: A string or integer representing the IP [& network].
|
|
'192.0.2.0/24'
|
|
'192.0.2.0/255.255.255.0'
|
|
'192.0.0.2/0.0.0.255'
|
|
are all functionally the same in IPv4. Similarly,
|
|
'192.0.2.1'
|
|
'192.0.2.1/255.255.255.255'
|
|
'192.0.2.1/32'
|
|
are also functionally equivalent. That is to say, failing to
|
|
provide a subnetmask will create an object with a mask of /32.
|
|
|
|
If the mask (portion after the / in the argument) is given in
|
|
dotted quad form, it is treated as a netmask if it starts with a
|
|
non-zero field (e.g. /255.0.0.0 == /8) and as a hostmask if it
|
|
starts with a zero field (e.g. 0.255.255.255 == /8), with the
|
|
single exception of an all-zero mask which is treated as a
|
|
netmask == /0. If no mask is given, a default of /32 is used.
|
|
|
|
Additionally, an integer can be passed, so
|
|
IPv4Network('192.0.2.1') == IPv4Network(3221225985)
|
|
or, more generally
|
|
IPv4Interface(int(IPv4Interface('192.0.2.1'))) ==
|
|
IPv4Interface('192.0.2.1')
|
|
|
|
Raises:
|
|
AddressValueError: If ipaddress isn't a valid IPv4 address.
|
|
NetmaskValueError: If the netmask isn't valid for
|
|
an IPv4 address.
|
|
ValueError: If strict is True and a network address is not
|
|
supplied.
|
|
|
|
"""
|
|
_BaseNetwork.__init__(self, address)
|
|
|
|
# Constructing from a packed address or integer
|
|
if isinstance(address, (int, bytes)):
|
|
self.network_address = IPv4Address(address)
|
|
self.netmask, self._prefixlen = self._make_netmask(self._max_prefixlen)
|
|
#fixme: address/network test here.
|
|
return
|
|
|
|
if isinstance(address, tuple):
|
|
if len(address) > 1:
|
|
arg = address[1]
|
|
else:
|
|
# We weren't given an address[1]
|
|
arg = self._max_prefixlen
|
|
self.network_address = IPv4Address(address[0])
|
|
self.netmask, self._prefixlen = self._make_netmask(arg)
|
|
packed = int(self.network_address)
|
|
if packed & int(self.netmask) != packed:
|
|
if strict:
|
|
raise ValueError('%s has host bits set' % self)
|
|
else:
|
|
self.network_address = IPv4Address(packed &
|
|
int(self.netmask))
|
|
return
|
|
|
|
# Assume input argument to be string or any object representation
|
|
# which converts into a formatted IP prefix string.
|
|
addr = _split_optional_netmask(address)
|
|
self.network_address = IPv4Address(self._ip_int_from_string(addr[0]))
|
|
|
|
if len(addr) == 2:
|
|
arg = addr[1]
|
|
else:
|
|
arg = self._max_prefixlen
|
|
self.netmask, self._prefixlen = self._make_netmask(arg)
|
|
|
|
if strict:
|
|
if (IPv4Address(int(self.network_address) & int(self.netmask)) !=
|
|
self.network_address):
|
|
raise ValueError('%s has host bits set' % self)
|
|
self.network_address = IPv4Address(int(self.network_address) &
|
|
int(self.netmask))
|
|
|
|
if self._prefixlen == (self._max_prefixlen - 1):
|
|
self.hosts = self.__iter__
|
|
|
|
@property
|
|
@functools.lru_cache()
|
|
def is_global(self):
|
|
"""Test if this address is allocated for public networks.
|
|
|
|
Returns:
|
|
A boolean, True if the address is not reserved per
|
|
iana-ipv4-special-registry.
|
|
|
|
"""
|
|
return (not (self.network_address in IPv4Network('100.64.0.0/10') and
|
|
self.broadcast_address in IPv4Network('100.64.0.0/10')) and
|
|
not self.is_private)
|
|
|
|
|
|
class _IPv4Constants:
|
|
_linklocal_network = IPv4Network('169.254.0.0/16')
|
|
|
|
_loopback_network = IPv4Network('127.0.0.0/8')
|
|
|
|
_multicast_network = IPv4Network('224.0.0.0/4')
|
|
|
|
_private_networks = [
|
|
IPv4Network('0.0.0.0/8'),
|
|
IPv4Network('10.0.0.0/8'),
|
|
IPv4Network('127.0.0.0/8'),
|
|
IPv4Network('169.254.0.0/16'),
|
|
IPv4Network('172.16.0.0/12'),
|
|
IPv4Network('192.0.0.0/29'),
|
|
IPv4Network('192.0.0.170/31'),
|
|
IPv4Network('192.0.2.0/24'),
|
|
IPv4Network('192.168.0.0/16'),
|
|
IPv4Network('198.18.0.0/15'),
|
|
IPv4Network('198.51.100.0/24'),
|
|
IPv4Network('203.0.113.0/24'),
|
|
IPv4Network('240.0.0.0/4'),
|
|
IPv4Network('255.255.255.255/32'),
|
|
]
|
|
|
|
_reserved_network = IPv4Network('240.0.0.0/4')
|
|
|
|
_unspecified_address = IPv4Address('0.0.0.0')
|
|
|
|
|
|
IPv4Address._constants = _IPv4Constants
|
|
|
|
|
|
class _BaseV6:
|
|
|
|
"""Base IPv6 object.
|
|
|
|
The following methods are used by IPv6 objects in both single IP
|
|
addresses and networks.
|
|
|
|
"""
|
|
|
|
__slots__ = ()
|
|
_version = 6
|
|
_ALL_ONES = (2**IPV6LENGTH) - 1
|
|
_HEXTET_COUNT = 8
|
|
_HEX_DIGITS = frozenset('0123456789ABCDEFabcdef')
|
|
_max_prefixlen = IPV6LENGTH
|
|
|
|
# There are only a bunch of valid v6 netmasks, so we cache them all
|
|
# when constructed (see _make_netmask()).
|
|
_netmask_cache = {}
|
|
|
|
@classmethod
|
|
def _make_netmask(cls, arg):
|
|
"""Make a (netmask, prefix_len) tuple from the given argument.
|
|
|
|
Argument can be:
|
|
- an integer (the prefix length)
|
|
- a string representing the prefix length (e.g. "24")
|
|
- a string representing the prefix netmask (e.g. "255.255.255.0")
|
|
"""
|
|
if arg not in cls._netmask_cache:
|
|
if isinstance(arg, int):
|
|
prefixlen = arg
|
|
else:
|
|
prefixlen = cls._prefix_from_prefix_string(arg)
|
|
netmask = IPv6Address(cls._ip_int_from_prefix(prefixlen))
|
|
cls._netmask_cache[arg] = netmask, prefixlen
|
|
return cls._netmask_cache[arg]
|
|
|
|
@classmethod
|
|
def _ip_int_from_string(cls, ip_str):
|
|
"""Turn an IPv6 ip_str into an integer.
|
|
|
|
Args:
|
|
ip_str: A string, the IPv6 ip_str.
|
|
|
|
Returns:
|
|
An int, the IPv6 address
|
|
|
|
Raises:
|
|
AddressValueError: if ip_str isn't a valid IPv6 Address.
|
|
|
|
"""
|
|
if not ip_str:
|
|
raise AddressValueError('Address cannot be empty')
|
|
|
|
parts = ip_str.split(':')
|
|
|
|
# An IPv6 address needs at least 2 colons (3 parts).
|
|
_min_parts = 3
|
|
if len(parts) < _min_parts:
|
|
msg = "At least %d parts expected in %r" % (_min_parts, ip_str)
|
|
raise AddressValueError(msg)
|
|
|
|
# If the address has an IPv4-style suffix, convert it to hexadecimal.
|
|
if '.' in parts[-1]:
|
|
try:
|
|
ipv4_int = IPv4Address(parts.pop())._ip
|
|
except AddressValueError as exc:
|
|
raise AddressValueError("%s in %r" % (exc, ip_str)) from None
|
|
parts.append('%x' % ((ipv4_int >> 16) & 0xFFFF))
|
|
parts.append('%x' % (ipv4_int & 0xFFFF))
|
|
|
|
# An IPv6 address can't have more than 8 colons (9 parts).
|
|
# The extra colon comes from using the "::" notation for a single
|
|
# leading or trailing zero part.
|
|
_max_parts = cls._HEXTET_COUNT + 1
|
|
if len(parts) > _max_parts:
|
|
msg = "At most %d colons permitted in %r" % (_max_parts-1, ip_str)
|
|
raise AddressValueError(msg)
|
|
|
|
# Disregarding the endpoints, find '::' with nothing in between.
|
|
# This indicates that a run of zeroes has been skipped.
|
|
skip_index = None
|
|
for i in range(1, len(parts) - 1):
|
|
if not parts[i]:
|
|
if skip_index is not None:
|
|
# Can't have more than one '::'
|
|
msg = "At most one '::' permitted in %r" % ip_str
|
|
raise AddressValueError(msg)
|
|
skip_index = i
|
|
|
|
# parts_hi is the number of parts to copy from above/before the '::'
|
|
# parts_lo is the number of parts to copy from below/after the '::'
|
|
if skip_index is not None:
|
|
# If we found a '::', then check if it also covers the endpoints.
|
|
parts_hi = skip_index
|
|
parts_lo = len(parts) - skip_index - 1
|
|
if not parts[0]:
|
|
parts_hi -= 1
|
|
if parts_hi:
|
|
msg = "Leading ':' only permitted as part of '::' in %r"
|
|
raise AddressValueError(msg % ip_str) # ^: requires ^::
|
|
if not parts[-1]:
|
|
parts_lo -= 1
|
|
if parts_lo:
|
|
msg = "Trailing ':' only permitted as part of '::' in %r"
|
|
raise AddressValueError(msg % ip_str) # :$ requires ::$
|
|
parts_skipped = cls._HEXTET_COUNT - (parts_hi + parts_lo)
|
|
if parts_skipped < 1:
|
|
msg = "Expected at most %d other parts with '::' in %r"
|
|
raise AddressValueError(msg % (cls._HEXTET_COUNT-1, ip_str))
|
|
else:
|
|
# Otherwise, allocate the entire address to parts_hi. The
|
|
# endpoints could still be empty, but _parse_hextet() will check
|
|
# for that.
|
|
if len(parts) != cls._HEXTET_COUNT:
|
|
msg = "Exactly %d parts expected without '::' in %r"
|
|
raise AddressValueError(msg % (cls._HEXTET_COUNT, ip_str))
|
|
if not parts[0]:
|
|
msg = "Leading ':' only permitted as part of '::' in %r"
|
|
raise AddressValueError(msg % ip_str) # ^: requires ^::
|
|
if not parts[-1]:
|
|
msg = "Trailing ':' only permitted as part of '::' in %r"
|
|
raise AddressValueError(msg % ip_str) # :$ requires ::$
|
|
parts_hi = len(parts)
|
|
parts_lo = 0
|
|
parts_skipped = 0
|
|
|
|
try:
|
|
# Now, parse the hextets into a 128-bit integer.
|
|
ip_int = 0
|
|
for i in range(parts_hi):
|
|
ip_int <<= 16
|
|
ip_int |= cls._parse_hextet(parts[i])
|
|
ip_int <<= 16 * parts_skipped
|
|
for i in range(-parts_lo, 0):
|
|
ip_int <<= 16
|
|
ip_int |= cls._parse_hextet(parts[i])
|
|
return ip_int
|
|
except ValueError as exc:
|
|
raise AddressValueError("%s in %r" % (exc, ip_str)) from None
|
|
|
|
@classmethod
|
|
def _parse_hextet(cls, hextet_str):
|
|
"""Convert an IPv6 hextet string into an integer.
|
|
|
|
Args:
|
|
hextet_str: A string, the number to parse.
|
|
|
|
Returns:
|
|
The hextet as an integer.
|
|
|
|
Raises:
|
|
ValueError: if the input isn't strictly a hex number from
|
|
[0..FFFF].
|
|
|
|
"""
|
|
# Whitelist the characters, since int() allows a lot of bizarre stuff.
|
|
if not cls._HEX_DIGITS.issuperset(hextet_str):
|
|
raise ValueError("Only hex digits permitted in %r" % hextet_str)
|
|
# We do the length check second, since the invalid character error
|
|
# is likely to be more informative for the user
|
|
if len(hextet_str) > 4:
|
|
msg = "At most 4 characters permitted in %r"
|
|
raise ValueError(msg % hextet_str)
|
|
# Length check means we can skip checking the integer value
|
|
return int(hextet_str, 16)
|
|
|
|
@classmethod
|
|
def _compress_hextets(cls, hextets):
|
|
"""Compresses a list of hextets.
|
|
|
|
Compresses a list of strings, replacing the longest continuous
|
|
sequence of "0" in the list with "" and adding empty strings at
|
|
the beginning or at the end of the string such that subsequently
|
|
calling ":".join(hextets) will produce the compressed version of
|
|
the IPv6 address.
|
|
|
|
Args:
|
|
hextets: A list of strings, the hextets to compress.
|
|
|
|
Returns:
|
|
A list of strings.
|
|
|
|
"""
|
|
best_doublecolon_start = -1
|
|
best_doublecolon_len = 0
|
|
doublecolon_start = -1
|
|
doublecolon_len = 0
|
|
for index, hextet in enumerate(hextets):
|
|
if hextet == '0':
|
|
doublecolon_len += 1
|
|
if doublecolon_start == -1:
|
|
# Start of a sequence of zeros.
|
|
doublecolon_start = index
|
|
if doublecolon_len > best_doublecolon_len:
|
|
# This is the longest sequence of zeros so far.
|
|
best_doublecolon_len = doublecolon_len
|
|
best_doublecolon_start = doublecolon_start
|
|
else:
|
|
doublecolon_len = 0
|
|
doublecolon_start = -1
|
|
|
|
if best_doublecolon_len > 1:
|
|
best_doublecolon_end = (best_doublecolon_start +
|
|
best_doublecolon_len)
|
|
# For zeros at the end of the address.
|
|
if best_doublecolon_end == len(hextets):
|
|
hextets += ['']
|
|
hextets[best_doublecolon_start:best_doublecolon_end] = ['']
|
|
# For zeros at the beginning of the address.
|
|
if best_doublecolon_start == 0:
|
|
hextets = [''] + hextets
|
|
|
|
return hextets
|
|
|
|
@classmethod
|
|
def _string_from_ip_int(cls, ip_int=None):
|
|
"""Turns a 128-bit integer into hexadecimal notation.
|
|
|
|
Args:
|
|
ip_int: An integer, the IP address.
|
|
|
|
Returns:
|
|
A string, the hexadecimal representation of the address.
|
|
|
|
Raises:
|
|
ValueError: The address is bigger than 128 bits of all ones.
|
|
|
|
"""
|
|
if ip_int is None:
|
|
ip_int = int(cls._ip)
|
|
|
|
if ip_int > cls._ALL_ONES:
|
|
raise ValueError('IPv6 address is too large')
|
|
|
|
hex_str = '%032x' % ip_int
|
|
hextets = ['%x' % int(hex_str[x:x+4], 16) for x in range(0, 32, 4)]
|
|
|
|
hextets = cls._compress_hextets(hextets)
|
|
return ':'.join(hextets)
|
|
|
|
def _explode_shorthand_ip_string(self):
|
|
"""Expand a shortened IPv6 address.
|
|
|
|
Args:
|
|
ip_str: A string, the IPv6 address.
|
|
|
|
Returns:
|
|
A string, the expanded IPv6 address.
|
|
|
|
"""
|
|
if isinstance(self, IPv6Network):
|
|
ip_str = str(self.network_address)
|
|
elif isinstance(self, IPv6Interface):
|
|
ip_str = str(self.ip)
|
|
else:
|
|
ip_str = str(self)
|
|
|
|
ip_int = self._ip_int_from_string(ip_str)
|
|
hex_str = '%032x' % ip_int
|
|
parts = [hex_str[x:x+4] for x in range(0, 32, 4)]
|
|
if isinstance(self, (_BaseNetwork, IPv6Interface)):
|
|
return '%s/%d' % (':'.join(parts), self._prefixlen)
|
|
return ':'.join(parts)
|
|
|
|
def _reverse_pointer(self):
|
|
"""Return the reverse DNS pointer name for the IPv6 address.
|
|
|
|
This implements the method described in RFC3596 2.5.
|
|
|
|
"""
|
|
reverse_chars = self.exploded[::-1].replace(':', '')
|
|
return '.'.join(reverse_chars) + '.ip6.arpa'
|
|
|
|
@property
|
|
def max_prefixlen(self):
|
|
return self._max_prefixlen
|
|
|
|
@property
|
|
def version(self):
|
|
return self._version
|
|
|
|
|
|
class IPv6Address(_BaseV6, _BaseAddress):
|
|
|
|
"""Represent and manipulate single IPv6 Addresses."""
|
|
|
|
__slots__ = ('_ip', '__weakref__')
|
|
|
|
def __init__(self, address):
|
|
"""Instantiate a new IPv6 address object.
|
|
|
|
Args:
|
|
address: A string or integer representing the IP
|
|
|
|
Additionally, an integer can be passed, so
|
|
IPv6Address('2001:db8::') ==
|
|
IPv6Address(42540766411282592856903984951653826560)
|
|
or, more generally
|
|
IPv6Address(int(IPv6Address('2001:db8::'))) ==
|
|
IPv6Address('2001:db8::')
|
|
|
|
Raises:
|
|
AddressValueError: If address isn't a valid IPv6 address.
|
|
|
|
"""
|
|
# Efficient constructor from integer.
|
|
if isinstance(address, int):
|
|
self._check_int_address(address)
|
|
self._ip = address
|
|
return
|
|
|
|
# Constructing from a packed address
|
|
if isinstance(address, bytes):
|
|
self._check_packed_address(address, 16)
|
|
self._ip = int.from_bytes(address, 'big')
|
|
return
|
|
|
|
# Assume input argument to be string or any object representation
|
|
# which converts into a formatted IP string.
|
|
addr_str = str(address)
|
|
if '/' in addr_str:
|
|
raise AddressValueError("Unexpected '/' in %r" % address)
|
|
self._ip = self._ip_int_from_string(addr_str)
|
|
|
|
@property
|
|
def packed(self):
|
|
"""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.
|
|
|
|
"""
|
|
return self in self._constants._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.
|
|
|
|
"""
|
|
return any(self in x for x in self._constants._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.
|
|
|
|
"""
|
|
return self in self._constants._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.
|
|
|
|
"""
|
|
return self in self._constants._sitelocal_network
|
|
|
|
@property
|
|
@functools.lru_cache()
|
|
def is_private(self):
|
|
"""Test if this address is allocated for private networks.
|
|
|
|
Returns:
|
|
A boolean, True if the address is reserved per
|
|
iana-ipv6-special-registry.
|
|
|
|
"""
|
|
return any(self in net for net in self._constants._private_networks)
|
|
|
|
@property
|
|
def is_global(self):
|
|
"""Test if this address is allocated for public networks.
|
|
|
|
Returns:
|
|
A boolean, true if the address is not reserved per
|
|
iana-ipv6-special-registry.
|
|
|
|
"""
|
|
return not self.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._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):
|
|
|
|
def __init__(self, address):
|
|
if isinstance(address, (bytes, int)):
|
|
IPv6Address.__init__(self, address)
|
|
self.network = IPv6Network(self._ip)
|
|
self._prefixlen = self._max_prefixlen
|
|
return
|
|
if isinstance(address, tuple):
|
|
IPv6Address.__init__(self, address[0])
|
|
if len(address) > 1:
|
|
self._prefixlen = int(address[1])
|
|
else:
|
|
self._prefixlen = self._max_prefixlen
|
|
self.network = IPv6Network(address, strict=False)
|
|
self.netmask = self.network.netmask
|
|
self.hostmask = self.network.hostmask
|
|
return
|
|
|
|
addr = _split_optional_netmask(address)
|
|
IPv6Address.__init__(self, addr[0])
|
|
self.network = IPv6Network(address, strict=False)
|
|
self.netmask = self.network.netmask
|
|
self._prefixlen = self.network._prefixlen
|
|
self.hostmask = self.network.hostmask
|
|
|
|
def __str__(self):
|
|
return '%s/%d' % (self._string_from_ip_int(self._ip),
|
|
self.network.prefixlen)
|
|
|
|
def __eq__(self, other):
|
|
address_equal = IPv6Address.__eq__(self, other)
|
|
if not address_equal or address_equal is NotImplemented:
|
|
return address_equal
|
|
try:
|
|
return self.network == other.network
|
|
except AttributeError:
|
|
# An interface with an associated network is NOT the
|
|
# same as an unassociated address. That's why the hash
|
|
# takes the extra info into account.
|
|
return False
|
|
|
|
def __lt__(self, other):
|
|
address_less = IPv6Address.__lt__(self, other)
|
|
if address_less is NotImplemented:
|
|
return NotImplemented
|
|
try:
|
|
return self.network < other.network
|
|
except AttributeError:
|
|
# We *do* allow addresses and interfaces to be sorted. The
|
|
# unassociated address is considered less than all interfaces.
|
|
return False
|
|
|
|
def __hash__(self):
|
|
return self._ip ^ self._prefixlen ^ int(self.network.network_address)
|
|
|
|
__reduce__ = _IPAddressBase.__reduce__
|
|
|
|
@property
|
|
def ip(self):
|
|
return IPv6Address(self._ip)
|
|
|
|
@property
|
|
def with_prefixlen(self):
|
|
return '%s/%s' % (self._string_from_ip_int(self._ip),
|
|
self._prefixlen)
|
|
|
|
@property
|
|
def with_netmask(self):
|
|
return '%s/%s' % (self._string_from_ip_int(self._ip),
|
|
self.netmask)
|
|
|
|
@property
|
|
def with_hostmask(self):
|
|
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):
|
|
|
|
"""This class represents and manipulates 128-bit IPv6 networks.
|
|
|
|
Attributes: [examples for IPv6('2001:db8::1000/124')]
|
|
.network_address: IPv6Address('2001:db8::1000')
|
|
.hostmask: IPv6Address('::f')
|
|
.broadcast_address: IPv6Address('2001:db8::100f')
|
|
.netmask: IPv6Address('ffff:ffff:ffff:ffff:ffff:ffff:ffff:fff0')
|
|
.prefixlen: 124
|
|
|
|
"""
|
|
|
|
# Class to use when creating address objects
|
|
_address_class = IPv6Address
|
|
|
|
def __init__(self, address, strict=True):
|
|
"""Instantiate a new IPv6 Network object.
|
|
|
|
Args:
|
|
address: A string or integer representing the IPv6 network or the
|
|
IP and prefix/netmask.
|
|
'2001:db8::/128'
|
|
'2001:db8:0000:0000:0000:0000:0000:0000/128'
|
|
'2001:db8::'
|
|
are all functionally the same in IPv6. That is to say,
|
|
failing to provide a subnetmask will create an object with
|
|
a mask of /128.
|
|
|
|
Additionally, an integer can be passed, so
|
|
IPv6Network('2001:db8::') ==
|
|
IPv6Network(42540766411282592856903984951653826560)
|
|
or, more generally
|
|
IPv6Network(int(IPv6Network('2001:db8::'))) ==
|
|
IPv6Network('2001:db8::')
|
|
|
|
strict: A boolean. If true, ensure that we have been passed
|
|
A true network address, eg, 2001:db8::1000/124 and not an
|
|
IP address on a network, eg, 2001:db8::1/124.
|
|
|
|
Raises:
|
|
AddressValueError: If address isn't a valid IPv6 address.
|
|
NetmaskValueError: If the netmask isn't valid for
|
|
an IPv6 address.
|
|
ValueError: If strict was True and a network address was not
|
|
supplied.
|
|
|
|
"""
|
|
_BaseNetwork.__init__(self, address)
|
|
|
|
# Efficient constructor from integer or packed address
|
|
if isinstance(address, (bytes, int)):
|
|
self.network_address = IPv6Address(address)
|
|
self.netmask, self._prefixlen = self._make_netmask(self._max_prefixlen)
|
|
return
|
|
|
|
if isinstance(address, tuple):
|
|
if len(address) > 1:
|
|
arg = address[1]
|
|
else:
|
|
arg = self._max_prefixlen
|
|
self.netmask, self._prefixlen = self._make_netmask(arg)
|
|
self.network_address = IPv6Address(address[0])
|
|
packed = int(self.network_address)
|
|
if packed & int(self.netmask) != packed:
|
|
if strict:
|
|
raise ValueError('%s has host bits set' % self)
|
|
else:
|
|
self.network_address = IPv6Address(packed &
|
|
int(self.netmask))
|
|
return
|
|
|
|
# Assume input argument to be string or any object representation
|
|
# which converts into a formatted IP prefix string.
|
|
addr = _split_optional_netmask(address)
|
|
|
|
self.network_address = IPv6Address(self._ip_int_from_string(addr[0]))
|
|
|
|
if len(addr) == 2:
|
|
arg = addr[1]
|
|
else:
|
|
arg = self._max_prefixlen
|
|
self.netmask, self._prefixlen = self._make_netmask(arg)
|
|
|
|
if strict:
|
|
if (IPv6Address(int(self.network_address) & int(self.netmask)) !=
|
|
self.network_address):
|
|
raise ValueError('%s has host bits set' % self)
|
|
self.network_address = IPv6Address(int(self.network_address) &
|
|
int(self.netmask))
|
|
|
|
if self._prefixlen == (self._max_prefixlen - 1):
|
|
self.hosts = self.__iter__
|
|
|
|
def hosts(self):
|
|
"""Generate Iterator over usable hosts in a network.
|
|
|
|
This is like __iter__ except it doesn't return the
|
|
Subnet-Router anycast address.
|
|
|
|
"""
|
|
network = int(self.network_address)
|
|
broadcast = int(self.broadcast_address)
|
|
for x in range(network + 1, broadcast + 1):
|
|
yield self._address_class(x)
|
|
|
|
@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)
|
|
|
|
|
|
class _IPv6Constants:
|
|
|
|
_linklocal_network = IPv6Network('fe80::/10')
|
|
|
|
_multicast_network = IPv6Network('ff00::/8')
|
|
|
|
_private_networks = [
|
|
IPv6Network('::1/128'),
|
|
IPv6Network('::/128'),
|
|
IPv6Network('::ffff:0:0/96'),
|
|
IPv6Network('100::/64'),
|
|
IPv6Network('2001::/23'),
|
|
IPv6Network('2001:2::/48'),
|
|
IPv6Network('2001:db8::/32'),
|
|
IPv6Network('2001:10::/28'),
|
|
IPv6Network('fc00::/7'),
|
|
IPv6Network('fe80::/10'),
|
|
]
|
|
|
|
_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'),
|
|
]
|
|
|
|
_sitelocal_network = IPv6Network('fec0::/10')
|
|
|
|
|
|
IPv6Address._constants = _IPv6Constants
|