VirtualMailManager/network.py
author Pascal Volk <neverseen@users.sourceforge.net>
Wed, 26 Oct 2011 03:20:40 +0000
branchv0.6.x
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child 568 14abdd04ddf5
permissions -rw-r--r--
man: Reworked/updated German manual pages.
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# -*- coding: UTF-8 -*-
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# Copyright (c) 2011, Pascal Volk
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# See COPYING for distribution information.
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"""
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    VirtualMailManager.network
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    ~~~~~~~~~~~~~~~~~~~~~~~~~~
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    Network/IP address related class and function
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"""
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import socket
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class NetInfo(object):
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    """Simple class for CIDR network addresses an IP addresses."""
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    __slots__ = ('_addr', '_prefix', '_bits_max', '_family', '_nw_addr')
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    def __init__(self, nw_address):
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        """Creates a new `NetInfo` instance.
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        Argument:
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        `nw_address` : basestring
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          string representation of an IPv4/IPv6 address or network address.
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          E.g. 192.0.2.13, 192.0.2.0/24, 2001:db8::/32 or ::1
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          When the address has no netmask the prefix length will be set to
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          32 for IPv4 addresses and 128 for IPv6 addresses.
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        """
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        self._addr = None
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        self._prefix = 0
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        self._bits_max = 0
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        self._family = 0
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        self._nw_addr = nw_address
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        self._parse_net_range()
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    def __hash__(self):
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        return hash((self._addr, self._family, self._prefix))
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    def __repr__(self):
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        return "NetInfo('%s')" % self._nw_addr
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    def _parse_net_range(self):
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        """Parse the network range of `self._nw_addr and assign values
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        to the class attributes.
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        `"""
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        sep = '/'
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        if self._nw_addr.count(sep):
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            ip_address, sep, self._prefix = self._nw_addr.partition(sep)
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            self._family, self._addr = get_ip_addr_info(ip_address)
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        else:
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            self._family, self._addr = get_ip_addr_info(self._nw_addr)
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        self._bits_max = (128, 32)[self._family is socket.AF_INET]
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        if self._prefix is 0:
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            self._prefix = self._bits_max
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        else:
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            try:
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                self._prefix = int(self._prefix)
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            except ValueError:
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                raise ValueError('Invalid prefix length: %r' % self._prefix)
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        if self._prefix > self._bits_max or self._prefix < 0:
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            raise ValueError('Invalid prefix length: %r' % self._prefix)
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    @property
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    def family(self):
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        """Address family: `socket.AF_INET` or `socket.AF_INET6`"""
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        return self._family
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    def address_in_net(self, ip_address):
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        """Checks if the `ip_address` belongs to the same subnet."""
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        family, address = get_ip_addr_info(ip_address)
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        if family != self._family:
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            return False
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        return address >> self._bits_max - self._prefix == \
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               self._addr >> self._bits_max - self._prefix
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def get_ip_addr_info(ip_address):
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    """Checks if the string `ip_address` is a valid IPv4 or IPv6 address.
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    When the `ip_address` could be validated successfully a tuple
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    `(address_family, address_as_long)` will be returned. The
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    `address_family`will be either `socket.AF_INET` or `socket.AF_INET6`.
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    """
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    if not isinstance(ip_address, basestring) or not ip_address:
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        raise TypeError('ip_address must be a non empty string.')
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    if not ip_address.count(':'):
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        family = socket.AF_INET
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        try:
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            address = socket.inet_aton(ip_address)
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        except socket.error:
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            raise ValueError('Not a valid IPv4 address: %r' % ip_address)
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    elif not socket.has_ipv6:
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        raise ValueError('Unsupported IP address (IPv6): %r' % ip_address)
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    else:
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        family = socket.AF_INET6
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        try:
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            address = socket.inet_pton(family, ip_address)
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        except socket.error:
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            raise ValueError('Not a valid IPv6 address: %r' % ip_address)
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    return (family, long(address.encode('hex'), 16))