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61 lines
1.9 KiB
61 lines
1.9 KiB
# Copyright (C) Dnspython Contributors, see LICENSE for text of ISC license
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# Copyright (C) 2003-2017 Nominum, Inc.
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#
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# Permission to use, copy, modify, and distribute this software and its
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# documentation for any purpose with or without fee is hereby granted,
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# provided that the above copyright notice and this permission notice
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# appear in all copies.
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#
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# THE SOFTWARE IS PROVIDED "AS IS" AND NOMINUM DISCLAIMS ALL WARRANTIES
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# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NOMINUM BE LIABLE FOR
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# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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# WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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# ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
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# OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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"""IPv4 helper functions."""
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import struct
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import dns.exception
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def inet_ntoa(address):
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"""Convert an IPv4 address in binary form to text form.
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*address*, a ``bytes``, the IPv4 address in binary form.
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Returns a ``str``.
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"""
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if len(address) != 4:
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raise dns.exception.SyntaxError
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return ('%u.%u.%u.%u' % (address[0], address[1],
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address[2], address[3]))
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def inet_aton(text):
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"""Convert an IPv4 address in text form to binary form.
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*text*, a ``str``, the IPv4 address in textual form.
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Returns a ``bytes``.
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"""
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if not isinstance(text, bytes):
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text = text.encode()
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parts = text.split(b'.')
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if len(parts) != 4:
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raise dns.exception.SyntaxError
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for part in parts:
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if not part.isdigit():
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raise dns.exception.SyntaxError
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if len(part) > 1 and part[0] == ord('0'):
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# No leading zeros
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raise dns.exception.SyntaxError
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try:
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b = [int(part) for part in parts]
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return struct.pack('BBBB', *b)
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except Exception:
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raise dns.exception.SyntaxError
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