/usr/lib/python3/dist-packages/dns/wiredata.py is in python3-dnspython 1.12.0-0ubuntu3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 | # Copyright (C) 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 Wire Data Helper"""
import sys
import dns.exception
class WireData(bytes):
# WireData is a bytes with stricter slicing
def __getitem__(self, key):
try:
if isinstance(key, slice):
start = key.start
if start is None:
start = 0
elif start < 0:
start += len(self)
stop = key.stop
if stop is None:
stop = len(self)
elif stop < 0:
stop += len(self)
if start < 0 or stop < 0:
raise dns.exception.FormError
# If it's not an empty slice, access left and right bounds
# to make sure they're valid
if start != stop:
super(WireData, self).__getitem__(start)
super(WireData, self).__getitem__(stop - 1)
return WireData(super(WireData, self).__getitem__(key))
else:
return super(WireData, self).__getitem__(key)
except IndexError:
raise dns.exception.FormError
def __iter__(self):
i = 0
while 1:
try:
yield self[i]
i += 1
except dns.exception.FormError:
raise StopIteration
def unwrap(self):
return bytes(self)
def maybe_wrap(wire):
if not isinstance(wire, WireData):
return WireData(wire)
else:
return wire
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