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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
- from ._compat import binary_type
- 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
- if not isinstance(address, bytearray):
- address = bytearray(address)
- return (u'%u.%u.%u.%u' % (address[0], address[1],
- address[2], address[3])).encode()
- def inet_aton(text):
- """Convert an IPv4 address in text form to network form.
- @param text: The IPv4 address
- @type text: string
- @returns: string
- """
- if not isinstance(text, binary_type):
- text = text.encode()
- parts = text.split(b'.')
- 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
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