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

 1  # Copyright (C) 2003-2007, 2009-2011 Nominum, Inc. 
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15   
16  """IPv4 helper functions.""" 
17   
18  import struct 
19   
20  import dns.exception 
21   
22 -def inet_ntoa(address):
23 """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])
32
33 -def inet_aton(text):
34 """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.SyntaxError
54