FM / dns

/opt/imh-python/lib/python3.9/site-packages/dns/

/opt/imh-python/lib/python3.9/site-packages/dns

Name	Size	Mode	Actions
dnssecalgs/	-	0755	rm
quic/	-	0755	rm
rdtypes/	-	0755	rm
__pycache__/	-	0755	rm
asyncbackend.py	2796	0644	edit dl rm
asyncquery.py	30821	0644	edit dl rm
asyncresolver.py	17852	0644	edit dl rm
dnssec.py	41717	0644	edit dl rm
dnssectypes.py	1799	0644	edit dl rm
e164.py	3978	0644	edit dl rm
edns.py	17089	0644	edit dl rm
entropy.py	4242	0644	edit dl rm
enum.py	3691	0644	edit dl rm
exception.py	5953	0644	edit dl rm
flags.py	2750	0644	edit dl rm
grange.py	2144	0644	edit dl rm
immutable.py	2017	0644	edit dl rm
inet.py	5772	0644	edit dl rm
ipv4.py	2552	0644	edit dl rm
ipv6.py	6554	0644	edit dl rm
message.py	68185	0644	edit dl rm
name.py	42778	0644	edit dl rm
namedict.py	4000	0644	edit dl rm
nameserver.py	10115	0644	edit dl rm
node.py	12663	0644	edit dl rm
opcode.py	2730	0644	edit dl rm
py.typed	0	0644	edit dl rm
query.py	56298	0644	edit dl rm
rcode.py	4156	0644	edit dl rm
rdata.py	31022	0644	edit dl rm
rdataclass.py	2984	0644	edit dl rm
rdataset.py	16664	0644	edit dl rm
rdatatype.py	7448	0644	edit dl rm
renderer.py	11254	0644	edit dl rm
resolver.py	73730	0644	edit dl rm
reversename.py	3828	0644	edit dl rm
rrset.py	9170	0644	edit dl rm
serial.py	3606	0644	edit dl rm
set.py	9213	0644	edit dl rm
tokenizer.py	23583	0644	edit dl rm
transaction.py	22589	0644	edit dl rm
tsig.py	11413	0644	edit dl rm
tsigkeyring.py	2633	0644	edit dl rm
ttl.py	2977	0644	edit dl rm
update.py	12243	0644	edit dl rm
version.py	1926	0644	edit dl rm
versioned.py	11765	0644	edit dl rm
win32util.py	8874	0644	edit dl rm
wire.py	2830	0644	edit dl rm
xfr.py	13271	0644	edit dl rm
zone.py	52086	0644	edit dl rm
zonefile.py	27926	0644	edit dl rm
zonetypes.py	690	0644	edit dl rm
_asyncbackend.py	2396	0644	edit dl rm
_asyncio_backend.py	9051	0644	edit dl rm
_ddr.py	5247	0644	edit dl rm
_features.py	2492	0644	edit dl rm
_immutable_ctx.py	2459	0644	edit dl rm
_trio_backend.py	8473	0644	edit dl rm
__init__.py	1663	0644	edit dl rm

Edit: /opt/imh-python/lib/python3.9/site-packages/dns/ipv6.py (6554B)

# 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.

"""IPv6 helper functions."""

import binascii
import re
from typing import List, Union

import dns.exception
import dns.ipv4

_leading_zero = re.compile(r"0+([0-9a-f]+)")

def inet_ntoa(address: bytes) -> str:
    """Convert an IPv6 address in binary form to text form.

*address*, a ``bytes``, the IPv6 address in binary form.

Raises ``ValueError`` if the address isn't 16 bytes long.
    Returns a ``str``.
    """

if len(address) != 16:
        raise ValueError("IPv6 addresses are 16 bytes long")
    hex = binascii.hexlify(address)
    chunks = []
    i = 0
    l = len(hex)
    while i < l:
        chunk = hex[i : i + 4].decode()
        # strip leading zeros.  we do this with an re instead of
        # with lstrip() because lstrip() didn't support chars until
        # python 2.2.2
        m = _leading_zero.match(chunk)
        if m is not None:
            chunk = m.group(1)
        chunks.append(chunk)
        i += 4
    #
    # Compress the longest subsequence of 0-value chunks to ::
    #
    best_start = 0
    best_len = 0
    start = -1
    last_was_zero = False
    for i in range(8):
        if chunks[i] != "0":
            if last_was_zero:
                end = i
                current_len = end - start
                if current_len > best_len:
                    best_start = start
                    best_len = current_len
                last_was_zero = False
        elif not last_was_zero:
            start = i
            last_was_zero = True
    if last_was_zero:
        end = 8
        current_len = end - start
        if current_len > best_len:
            best_start = start
            best_len = current_len
    if best_len > 1:
        if best_start == 0 and (best_len == 6 or best_len == 5 and chunks[5] == "ffff"):
            # We have an embedded IPv4 address
            if best_len == 6:
                prefix = "::"
            else:
                prefix = "::ffff:"
            thex = prefix + dns.ipv4.inet_ntoa(address[12:])
        else:
            thex = (
                ":".join(chunks[:best_start])
                + "::"
                + ":".join(chunks[best_start + best_len :])
            )
    else:
        thex = ":".join(chunks)
    return thex

_v4_ending = re.compile(rb"(.*):(\d+\.\d+\.\d+\.\d+)$")
_colon_colon_start = re.compile(rb"::.*")
_colon_colon_end = re.compile(rb".*::$")

def inet_aton(text: Union[str, bytes], ignore_scope: bool = False) -> bytes:
    """Convert an IPv6 address in text form to binary form.

*text*, a ``str`` or ``bytes``, the IPv6 address in textual form.

*ignore_scope*, a ``bool``.  If ``True``, a scope will be ignored.
    If ``False``, the default, it is an error for a scope to be present.

Returns a ``bytes``.
    """

#
    # Our aim here is not something fast; we just want something that works.
    #
    if not isinstance(text, bytes):
        btext = text.encode()
    else:
        btext = text

if ignore_scope:
        parts = btext.split(b"%")
        l = len(parts)
        if l == 2:
            btext = parts[0]
        elif l > 2:
            raise dns.exception.SyntaxError

if btext == b"":
        raise dns.exception.SyntaxError
    elif btext.endswith(b":") and not btext.endswith(b"::"):
        raise dns.exception.SyntaxError
    elif btext.startswith(b":") and not btext.startswith(b"::"):
        raise dns.exception.SyntaxError
    elif btext == b"::":
        btext = b"0::"
    #
    # Get rid of the icky dot-quad syntax if we have it.
    #
    m = _v4_ending.match(btext)
    if m is not None:
        b = dns.ipv4.inet_aton(m.group(2))
        btext = (
            f"{m.group(1).decode()}:{b[0]:02x}{b[1]:02x}:{b[2]:02x}{b[3]:02x}"
        ).encode()
    #
    # Try to turn '::<whatever>' into ':<whatever>'; if no match try to
    # turn '<whatever>::' into '<whatever>:'
    #
    m = _colon_colon_start.match(btext)
    if m is not None:
        btext = btext[1:]
    else:
        m = _colon_colon_end.match(btext)
        if m is not None:
            btext = btext[:-1]
    #
    # Now canonicalize into 8 chunks of 4 hex digits each
    #
    chunks = btext.split(b":")
    l = len(chunks)
    if l > 8:
        raise dns.exception.SyntaxError
    seen_empty = False
    canonical: List[bytes] = []
    for c in chunks:
        if c == b"":
            if seen_empty:
                raise dns.exception.SyntaxError
            seen_empty = True
            for _ in range(0, 8 - l + 1):
                canonical.append(b"0000")
        else:
            lc = len(c)
            if lc > 4:
                raise dns.exception.SyntaxError
            if lc != 4:
                c = (b"0" * (4 - lc)) + c
            canonical.append(c)
    if l < 8 and not seen_empty:
        raise dns.exception.SyntaxError
    btext = b"".join(canonical)

#
    # Finally we can go to binary.
    #
    try:
        return binascii.unhexlify(btext)
    except (binascii.Error, TypeError):
        raise dns.exception.SyntaxError

_mapped_prefix = b"\x00" * 10 + b"\xff\xff"

def is_mapped(address: bytes) -> bool:
    """Is the specified address a mapped IPv4 address?

*address*, a ``bytes`` is an IPv6 address in binary form.

Returns a ``bool``.
    """

return address.startswith(_mapped_prefix)

def canonicalize(text: Union[str, bytes]) -> str:
    """Verify that *address* is a valid text form IPv6 address and return its
    canonical text form.  Addresses with scopes are rejected.

*text*, a ``str`` or ``bytes``, the IPv6 address in textual form.

Raises ``dns.exception.SyntaxError`` if the text is not valid.
    """
    return dns.ipv6.inet_ntoa(dns.ipv6.inet_aton(text))

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