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1 # Copyright (C) 2003-2007, 2009-2011 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 18 import struct 19 20 import dns.exception 2123 """Convert an IPv4 address in network form to text form. 24 25 @param address: The IPv4 address 26 @type address: bytes 27 @returns: string 28 """ 29 if len(address) != 4: 30 raise dns.exception.SyntaxError 31 return '%u.%u.%u.%u' % (address[0], address[1], address[2], address[3])3234 """Convert an IPv4 address in text form to network form. 35 36 @param text: The IPv4 address 37 @type text: string 38 @returns: bytes 39 """ 40 parts = text.split('.') 41 if len(parts) != 4: 42 raise dns.exception.SyntaxError 43 for part in parts: 44 if not part.isdigit(): 45 raise dns.exception.SyntaxError 46 if len(part) > 1 and part[0] == '0': 47 # No leading zeros 48 raise dns.exception.SyntaxError 49 try: 50 bytes = [int(part) for part in parts] 51 return struct.pack('BBBB', *bytes) 52 except: 53 raise dns.exception.SyntaxError54
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