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