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File Name : 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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Name	Type	Size	Owner/Group	Permission	Last Modified	Actions
.	dir	-	root/root	0755	2024-06-15 06:37:18
..	dir	-	root/root	0755	2024-10-11 06:31:39
__pycache__	dir	-	root/root	0755	2024-06-15 06:37:18
rdtypes	dir	-	root/root	0755	2024-06-15 06:37:18
__init__.py	text/plain	1.3 KB	root/root	0644	2016-09-20 04:24:02
_compat.py	text/x-script.python	1.28 KB	root/root	0644	2016-09-20 04:24:02
dnssec.py	text/x-script.python	14.44 KB	root/root	0644	2016-09-20 04:24:02
e164.py	text/x-script.python	3.07 KB	root/root	0644	2016-09-20 04:24:02
edns.py	text/x-script.python	4.28 KB	root/root	0644	2016-09-20 04:24:02
entropy.py	text/x-script.python	4.36 KB	root/root	0644	2016-09-20 04:24:02
exception.py	text/x-script.python	4.52 KB	root/root	0644	2016-09-20 07:13:40
flags.py	text/x-script.python	2.6 KB	root/root	0644	2016-09-20 04:24:02
grange.py	text/x-script.python	1.93 KB	root/root	0644	2016-09-20 04:24:02
hash.py	text/x-script.python	1.07 KB	root/root	0644	2016-09-20 04:24:02
inet.py	text/x-script.python	3.17 KB	root/root	0644	2016-09-20 04:24:02
ipv4.py	text/x-script.python	1.98 KB	root/root	0644	2016-09-20 04:24:02
ipv6.py	text/x-script.python	5.17 KB	root/root	0644	2016-09-20 04:24:02
message.py	text/x-script.python	42.12 KB	root/root	0644	2016-09-26 03:38:18
name.py	text/x-script.python	28.74 KB	root/root	0644	2024-05-23 10:29:27
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node.py	text/x-script.python	5.91 KB	root/root	0644	2016-09-20 04:24:02
opcode.py	text/x-script.python	2.48 KB	root/root	0644	2016-09-20 04:24:02
query.py	text/x-script.python	19.18 KB	root/root	0644	2024-05-23 10:29:27
rcode.py	text/x-script.python	3.03 KB	root/root	0644	2016-09-20 04:24:02
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zone.py	text/x-script.python	39.09 KB	root/root	0644	2016-09-29 10:29:39