/usr/lib/python3/dist-packages/dkim/dnsplug.py is in python3-dkim 0.7.1-1.
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 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 | # This software is provided 'as-is', without any express or implied
# warranty. In no event will the author be held liable for any damages
# arising from the use of this software.
#
# Permission is granted to anyone to use this software for any purpose,
# including commercial applications, and to alter it and redistribute it
# freely, subject to the following restrictions:
#
# 1. The origin of this software must not be misrepresented; you must not
# claim that you wrote the original software. If you use this software
# in a product, an acknowledgment in the product documentation would be
# appreciated but is not required.
# 2. Altered source versions must be plainly marked as such, and must not be
# misrepresented as being the original software.
# 3. This notice may not be removed or altered from any source distribution.
#
# Copyright (c) 2008 Greg Hewgill http://hewgill.com
#
# This has been modified from the original software.
# Copyright (c) 2011 William Grant <me@williamgrant.id.au>
__all__ = [
'get_txt'
]
def get_txt_dnspython(name):
"""Return a TXT record associated with a DNS name."""
try:
a = dns.resolver.query(name, dns.rdatatype.TXT,raise_on_no_answer=False)
for r in a.response.answer:
if r.rdtype == dns.rdatatype.TXT:
return b"".join(r.items[0].strings)
except dns.resolver.NXDOMAIN: pass
return None
def get_txt_pydns(name):
"""Return a TXT record associated with a DNS name."""
# Older pydns releases don't like a trailing dot.
if name.endswith('.'):
name = name[:-1]
response = DNS.DnsRequest(name, qtype='txt').req()
if not response.answers:
return None
return b''.join(response.answers[0]['data'])
def get_txt_Milter_dns(name):
"""Return a TXT record associated with a DNS name."""
# Older pydns releases don't like a trailing dot.
if name.endswith('.'):
name = name[:-1]
sess = Session()
a = sess.dns(name,'TXT')
if a: return b''.join(a[0])
return None
# Prefer dnspython if it's there, otherwise use pydns.
try:
import dns.resolver
_get_txt = get_txt_dnspython
except ImportError:
try:
from Milter.dns import Session
_get_txt = get_txt_Milter_dns
except ImportError:
import DNS
DNS.DiscoverNameServers()
_get_txt = get_txt_pydns
def get_txt(name):
"""Return a TXT record associated with a DNS name.
@param name: The bytestring domain name to look up.
"""
# pydns needs Unicode, but DKIM's d= is ASCII (already punycoded).
try:
unicode_name = name.decode('ascii')
except UnicodeDecodeError:
return None
txt = _get_txt(unicode_name)
if type(txt) is str:
txt = txt.encode('utf-8')
return txt
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