Package dns :: Module ipv4
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Source Code for Module dns.ipv4

 1  # Copyright (C) 2003-2007, 2009-2011 Nominum, Inc. 
 2  # 
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 4  # documentation for any purpose with or without fee is hereby granted, 
 5  # provided that the above copyright notice and this permission notice 
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15   
16  """IPv4 helper functions.""" 
17   
18  import struct 
19   
20  import dns.exception 
21  from ._compat import binary_type 
22   
23 -def inet_ntoa(address):
24 """Convert an IPv4 address in network form to text form. 25 26 @param address: The IPv4 address 27 @type address: string 28 @returns: string 29 """ 30 if len(address) != 4: 31 raise dns.exception.SyntaxError 32 if not isinstance(address, bytearray): 33 address = bytearray(address) 34 return (u'%u.%u.%u.%u' % (address[0], address[1], 35 address[2], address[3])).encode()
36
37 -def inet_aton(text):
38 """Convert an IPv4 address in text form to network form. 39 40 @param text: The IPv4 address 41 @type text: string 42 @returns: string 43 """ 44 if not isinstance(text, binary_type): 45 text = text.encode() 46 parts = text.split(b'.') 47 if len(parts) != 4: 48 raise dns.exception.SyntaxError 49 for part in parts: 50 if not part.isdigit(): 51 raise dns.exception.SyntaxError 52 if len(part) > 1 and part[0] == '0': 53 # No leading zeros 54 raise dns.exception.SyntaxError 55 try: 56 bytes = [int(part) for part in parts] 57 return struct.pack('BBBB', *bytes) 58 except: 59 raise dns.exception.SyntaxError
60