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# Copyright (C) 2003-2007, 2009-2011 Nominum, Inc. # # Permission to use, copy, modify, and distribute this software and its # documentation for any purpose with or without fee is hereby granted, # provided that the above copyright notice and this permission notice # appear in all copies. # # THE SOFTWARE IS PROVIDED "AS IS" AND NOMINUM DISCLAIMS ALL WARRANTIES # WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF # MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NOMINUM BE LIABLE FOR # ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES # WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN # ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT # OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. """IPv4 helper functions.""" import struct import dns.exception def inet_ntoa(address): """Convert an IPv4 address in network form to text form. @param address: The IPv4 address @type address: string @returns: string """ if len(address) != 4: raise dns.exception.SyntaxError return '%u.%u.%u.%u' % (ord(address[0]), ord(address[1]), ord(address[2]), ord(address[3])) def inet_aton(text): """Convert an IPv4 address in text form to network form. @param text: The IPv4 address @type text: string @returns: string """ parts = text.split('.') if len(parts) != 4: raise dns.exception.SyntaxError for part in parts: if not part.isdigit(): raise dns.exception.SyntaxError if len(part) > 1 and part[0] == '0': # No leading zeros raise dns.exception.SyntaxError try: bytes = [int(part) for part in parts] return struct.pack('BBBB', *bytes) except: raise dns.exception.SyntaxError