1# Copyright (C) 2003-2007, 2009, 2010 Nominum, Inc.
2#
3# Permission to use, copy, modify, and distribute this software and its
4# documentation for any purpose with or without fee is hereby granted,
5# provided that the above copyright notice and this permission notice
6# appear in all copies.
7#
8# THE SOFTWARE IS PROVIDED "AS IS" AND NOMINUM DISCLAIMS ALL WARRANTIES
9# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
10# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NOMINUM BE LIABLE FOR
11# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
12# WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
13# ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
14# OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
15
16"""IPv4 helper functions."""
17
18import socket
19import sys
20
21if sys.hexversion < 0x02030000 or sys.platform == 'win32':
22    #
23    # Some versions of Python 2.2 have an inet_aton which rejects
24    # the valid IP address '255.255.255.255'.  It appears this
25    # problem is still present on the Win32 platform even in 2.3.
26    # We'll work around the problem.
27    #
28    def inet_aton(text):
29        if text == '255.255.255.255':
30            return '\xff' * 4
31        else:
32            return socket.inet_aton(text)
33else:
34    inet_aton = socket.inet_aton
35
36inet_ntoa = socket.inet_ntoa
37