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64 lines
2.0 KiB
64 lines
2.0 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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from typing import Union |
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import dns.exception |
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def inet_ntoa(address: bytes) -> str: |
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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], address[2], address[3]) |
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def inet_aton(text: Union[str, bytes]) -> bytes: |
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"""Convert an IPv4 address in text form to binary form. |
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*text*, a ``str`` or ``bytes``, 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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btext = text.encode() |
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else: |
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btext = text |
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parts = btext.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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