1 # Copyright (C) 2003-2007, 2009-2011 Nominum, Inc.
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.
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.
16 """IPv4 helper functions."""
22 def inet_ntoa(address):
24 raise dns.exception.SyntaxError
25 return '%u.%u.%u.%u' % (ord(address[0]), ord(address[1]),
26 ord(address[2]), ord(address[3]))
29 parts = text.split('.')
31 raise dns.exception.SyntaxError
33 if not part.isdigit():
34 raise dns.exception.SyntaxError
35 if len(part) > 1 and part[0] == '0':
37 raise dns.exception.SyntaxError
39 bytes = [int(part) for part in parts]
40 return struct.pack('BBBB', *bytes)
42 raise dns.exception.SyntaxError