mirror of https://github.com/morpheus65535/bazarr
90 lines
3.2 KiB
Python
90 lines
3.2 KiB
Python
# Copyright (C) 2006, 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 Reverse Map Names.
|
|
|
|
@var ipv4_reverse_domain: The DNS IPv4 reverse-map domain, in-addr.arpa.
|
|
@type ipv4_reverse_domain: dns.name.Name object
|
|
@var ipv6_reverse_domain: The DNS IPv6 reverse-map domain, ip6.arpa.
|
|
@type ipv6_reverse_domain: dns.name.Name object
|
|
"""
|
|
|
|
import binascii
|
|
import sys
|
|
|
|
import dns.name
|
|
import dns.ipv6
|
|
import dns.ipv4
|
|
|
|
ipv4_reverse_domain = dns.name.from_text('in-addr.arpa.')
|
|
ipv6_reverse_domain = dns.name.from_text('ip6.arpa.')
|
|
|
|
|
|
def from_address(text):
|
|
"""Convert an IPv4 or IPv6 address in textual form into a Name object whose
|
|
value is the reverse-map domain name of the address.
|
|
@param text: an IPv4 or IPv6 address in textual form (e.g. '127.0.0.1',
|
|
'::1')
|
|
@type text: str
|
|
@rtype: dns.name.Name object
|
|
"""
|
|
try:
|
|
v6 = dns.ipv6.inet_aton(text)
|
|
if dns.ipv6.is_mapped(v6):
|
|
if sys.version_info >= (3,):
|
|
parts = ['%d' % byte for byte in v6[12:]]
|
|
else:
|
|
parts = ['%d' % ord(byte) for byte in v6[12:]]
|
|
origin = ipv4_reverse_domain
|
|
else:
|
|
parts = [x for x in str(binascii.hexlify(v6).decode())]
|
|
origin = ipv6_reverse_domain
|
|
except Exception:
|
|
parts = ['%d' %
|
|
byte for byte in bytearray(dns.ipv4.inet_aton(text))]
|
|
origin = ipv4_reverse_domain
|
|
parts.reverse()
|
|
return dns.name.from_text('.'.join(parts), origin=origin)
|
|
|
|
|
|
def to_address(name):
|
|
"""Convert a reverse map domain name into textual address form.
|
|
@param name: an IPv4 or IPv6 address in reverse-map form.
|
|
@type name: dns.name.Name object
|
|
@rtype: str
|
|
"""
|
|
if name.is_subdomain(ipv4_reverse_domain):
|
|
name = name.relativize(ipv4_reverse_domain)
|
|
labels = list(name.labels)
|
|
labels.reverse()
|
|
text = b'.'.join(labels)
|
|
# run through inet_aton() to check syntax and make pretty.
|
|
return dns.ipv4.inet_ntoa(dns.ipv4.inet_aton(text))
|
|
elif name.is_subdomain(ipv6_reverse_domain):
|
|
name = name.relativize(ipv6_reverse_domain)
|
|
labels = list(name.labels)
|
|
labels.reverse()
|
|
parts = []
|
|
i = 0
|
|
l = len(labels)
|
|
while i < l:
|
|
parts.append(b''.join(labels[i:i + 4]))
|
|
i += 4
|
|
text = b':'.join(parts)
|
|
# run through inet_aton() to check syntax and make pretty.
|
|
return dns.ipv6.inet_ntoa(dns.ipv6.inet_aton(text))
|
|
else:
|
|
raise dns.exception.SyntaxError('unknown reverse-map address family')
|