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File Name : ipv4.py

# Copyright (C) Dnspython Contributors, see LICENSE for text of ISC license

# Copyright (C) 2003-2017 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
from typing import Union

import dns.exception

def inet_ntoa(address: bytes) -> str:
    """Convert an IPv4 address in binary form to text form.

*address*, a ``bytes``, the IPv4 address in binary form.

Returns a ``str``.
    """

if len(address) != 4:
        raise dns.exception.SyntaxError
    return "%u.%u.%u.%u" % (address[0], address[1], address[2], address[3])

def inet_aton(text: Union[str, bytes]) -> bytes:
    """Convert an IPv4 address in text form to binary form.

*text*, a ``str`` or ``bytes``, the IPv4 address in textual form.

Returns a ``bytes``.
    """

if not isinstance(text, bytes):
        btext = text.encode()
    else:
        btext = text
    parts = btext.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] == ord("0"):
            # No leading zeros
            raise dns.exception.SyntaxError
    try:
        b = [int(part) for part in parts]
        return struct.pack("BBBB", *b)
    except Exception:
        raise dns.exception.SyntaxError

def canonicalize(text: Union[str, bytes]) -> str:
    """Verify that *address* is a valid text form IPv4 address and return its
    canonical text form.

*text*, a ``str`` or ``bytes``, the IPv4 address in textual form.

Raises ``dns.exception.SyntaxError`` if the text is not valid.
    """
    # Note that inet_aton() only accepts canonial form, but we still run through
    # inet_ntoa() to ensure the output is a str.
    return dns.ipv4.inet_ntoa(dns.ipv4.inet_aton(text))

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Name	Type	Size	Owner/Group	Permission	Last Modified	Actions
.	dir	-	root/root	0755	2025-03-24 03:58:34
..	dir	-	root/root	0755	2025-09-02 07:04:27
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rdtypes	dir	-	root/root	0755	2025-03-24 03:58:34
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asyncquery.py	file	26.22 KB	root/root	0644	2024-02-18 06:35:12
asyncresolver.py	file	17.43 KB	root/root	0644	2024-02-18 06:35:12
dnssec.py	file	39.74 KB	root/root	0644	2024-02-18 06:35:12
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inet.py	file	5.64 KB	root/root	0644	2024-02-18 06:35:12
ipv4.py	file	2.49 KB	root/root	0644	2024-02-18 06:35:12
ipv6.py	file	6.45 KB	root/root	0644	2024-02-18 06:35:12
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