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//lib/python3.6/site-packages/dns/opcode.py

# Copyright (C) 2001-2007, 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.

"""DNS Opcodes."""

import dns.exception

QUERY = 0
IQUERY = 1
STATUS = 2
NOTIFY = 4
UPDATE = 5

_by_text = {
    'QUERY': QUERY,
    'IQUERY': IQUERY,
    'STATUS': STATUS,
    'NOTIFY': NOTIFY,
    'UPDATE': UPDATE
}

# We construct the inverse mapping programmatically to ensure that we
# cannot make any mistakes (e.g. omissions, cut-and-paste errors) that
# would cause the mapping not to be true inverse.

_by_value = dict((y, x) for x, y in _by_text.items())


class UnknownOpcode(dns.exception.DNSException):

    """An DNS opcode is unknown."""


def from_text(text):
    """Convert text into an opcode.

    @param text: the textual opcode
    @type text: string
    @raises UnknownOpcode: the opcode is unknown
    @rtype: int
    """

    if text.isdigit():
        value = int(text)
        if value >= 0 and value <= 15:
            return value
    value = _by_text.get(text.upper())
    if value is None:
        raise UnknownOpcode
    return value


def from_flags(flags):
    """Extract an opcode from DNS message flags.

    @param flags: int
    @rtype: int
    """

    return (flags & 0x7800) >> 11


def to_flags(value):
    """Convert an opcode to a value suitable for ORing into DNS message
    flags.
    @rtype: int
    """

    return (value << 11) & 0x7800


def to_text(value):
    """Convert an opcode to text.

    @param value: the opcdoe
    @type value: int
    @raises UnknownOpcode: the opcode is unknown
    @rtype: string
    """

    text = _by_value.get(value)
    if text is None:
        text = str(value)
    return text


def is_update(flags):
    """True if the opcode in flags is UPDATE.

    @param flags: DNS flags
    @type flags: int
    @rtype: bool
    """

    return from_flags(flags) == UPDATE

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rdtypes DIR	-	drwxr-xr-x	2025-04-06 18:08:43	Edit Download recursive recursive
__pycache__ DIR	-	drwxr-xr-x	2025-04-06 18:08:43	Edit Download recursive recursive
dnssec.py	14.44 KB	lrw-r--r--	2016-09-20 16:24:02	Edit Download recursive recursive
e164.py	3.07 KB	lrw-r--r--	2016-09-20 16:24:02	Edit Download recursive recursive
edns.py	4.28 KB	lrw-r--r--	2016-09-20 16:24:02	Edit Download recursive recursive
entropy.py	4.36 KB	lrw-r--r--	2016-09-20 16:24:02	Edit Download recursive recursive
exception.py	4.52 KB	lrw-r--r--	2016-09-20 19:13:40	Edit Download recursive recursive
flags.py	2.60 KB	lrw-r--r--	2016-09-20 16:24:02	Edit Download recursive recursive
grange.py	1.93 KB	lrw-r--r--	2016-09-20 16:24:02	Edit Download recursive recursive
hash.py	1.07 KB	lrw-r--r--	2016-09-20 16:24:02	Edit Download recursive recursive
inet.py	3.17 KB	lrw-r--r--	2016-09-20 16:24:02	Edit Download recursive recursive
ipv4.py	1.98 KB	lrw-r--r--	2016-09-20 16:24:02	Edit Download recursive recursive
ipv6.py	5.17 KB	lrw-r--r--	2016-09-20 16:24:02	Edit Download recursive recursive
message.py	42.12 KB	lrw-r--r--	2016-09-26 15:38:18	Edit Download recursive recursive
name.py	28.74 KB	lrw-r--r--	2024-05-23 10:29:27	Edit Download recursive recursive
namedict.py	3.59 KB	lrw-r--r--	2016-09-20 16:24:02	Edit Download recursive recursive
node.py	5.91 KB	lrw-r--r--	2016-09-20 16:24:02	Edit Download recursive recursive
opcode.py	2.48 KB	lrw-r--r--	2016-09-20 16:24:02	Edit Download recursive recursive
query.py	19.18 KB	lrw-r--r--	2024-05-23 10:29:27	Edit Download recursive recursive
rcode.py	3.03 KB	lrw-r--r--	2016-09-20 16:24:02	Edit Download recursive recursive
rdata.py	14.65 KB	lrw-r--r--	2016-09-20 16:24:02	Edit Download recursive recursive
rdataclass.py	3.18 KB	lrw-r--r--	2016-09-20 16:24:02	Edit Download recursive recursive
rdataset.py	11.29 KB	lrw-r--r--	2016-09-20 16:24:02	Edit Download recursive recursive
rdatatype.py	5.21 KB	lrw-r--r--	2016-09-20 19:54:45	Edit Download recursive recursive
renderer.py	11.64 KB	lrw-r--r--	2016-09-20 16:24:02	Edit Download recursive recursive
resolver.py	50.88 KB	lrw-r--r--	2016-09-26 15:52:30	Edit Download recursive recursive
reversename.py	3.23 KB	lrw-r--r--	2016-09-20 16:24:02	Edit Download recursive recursive
rrset.py	5.85 KB	lrw-r--r--	2016-09-25 19:25:33	Edit Download recursive recursive
set.py	7.53 KB	lrw-r--r--	2016-09-20 16:24:02	Edit Download recursive recursive
tokenizer.py	17.88 KB	lrw-r--r--	2016-09-20 16:24:02	Edit Download recursive recursive
tsig.py	7.54 KB	lrw-r--r--	2016-09-20 16:24:02	Edit Download recursive recursive
tsigkeyring.py	1.70 KB	lrw-r--r--	2016-09-20 16:24:02	Edit Download recursive recursive
ttl.py	2.23 KB	lrw-r--r--	2016-09-20 16:24:02	Edit Download recursive recursive
update.py	9.78 KB	lrw-r--r--	2016-09-20 16:24:02	Edit Download recursive recursive
version.py	1.23 KB	lrw-r--r--	2016-09-20 16:24:02	Edit Download recursive recursive
wiredata.py	3.64 KB	lrw-r--r--	2016-09-20 16:24:02	Edit Download recursive recursive
zone.py	39.09 KB	lrw-r--r--	2016-09-29 22:29:39	Edit Download recursive recursive
_compat.py	1.28 KB	lrw-r--r--	2016-09-20 16:24:02	Edit Download recursive recursive
__init__.py	1.30 KB	lrw-r--r--	2016-09-20 16:24:02	Edit Download recursive recursive

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