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1 # Copyright (C) 2006, 2007, 2009-2011 Nominum, Inc. 2 # 3 # Permission to use, copy, modify, and distribute this software and its 4 # documentation for any purpose with or without fee is hereby granted, 5 # provided that the above copyright notice and this permission notice 6 # appear in all copies. 7 # 8 # THE SOFTWARE IS PROVIDED "AS IS" AND NOMINUM DISCLAIMS ALL WARRANTIES 9 # WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 10 # MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NOMINUM BE LIABLE FOR 11 # ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 12 # WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 13 # ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT 14 # OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 15 16 """DNS Reverse Map Names. 17 18 @var ipv4_reverse_domain: The DNS IPv4 reverse-map domain, in-addr.arpa. 19 @type ipv4_reverse_domain: dns.name.Name object 20 @var ipv6_reverse_domain: The DNS IPv6 reverse-map domain, ip6.arpa. 21 @type ipv6_reverse_domain: dns.name.Name object 22 """ 23 24 import binascii 25 import sys 26 27 import dns.name 28 import dns.ipv6 29 import dns.ipv4 30 31 ipv4_reverse_domain = dns.name.from_text('in-addr.arpa.') 32 ipv6_reverse_domain = dns.name.from_text('ip6.arpa.') 33 3436 """Convert an IPv4 or IPv6 address in textual form into a Name object whose 37 value is the reverse-map domain name of the address. 38 @param text: an IPv4 or IPv6 address in textual form (e.g. '127.0.0.1', 39 '::1') 40 @type text: str 41 @rtype: dns.name.Name object 42 """ 43 try: 44 v6 = dns.ipv6.inet_aton(text) 45 if dns.ipv6.is_mapped(v6): 46 if sys.version_info >= (3,): 47 parts = ['%d' % byte for byte in v6[12:]] 48 else: 49 parts = ['%d' % ord(byte) for byte in v6[12:]] 50 origin = ipv4_reverse_domain 51 else: 52 parts = [x for x in str(binascii.hexlify(v6).decode())] 53 origin = ipv6_reverse_domain 54 except: 55 parts = ['%d' % 56 byte for byte in bytearray(dns.ipv4.inet_aton(text))] 57 origin = ipv4_reverse_domain 58 parts.reverse() 59 return dns.name.from_text('.'.join(parts), origin=origin)60 6163 """Convert a reverse map domain name into textual address form. 64 @param name: an IPv4 or IPv6 address in reverse-map form. 65 @type name: dns.name.Name object 66 @rtype: str 67 """ 68 if name.is_subdomain(ipv4_reverse_domain): 69 name = name.relativize(ipv4_reverse_domain) 70 labels = list(name.labels) 71 labels.reverse() 72 text = b'.'.join(labels) 73 # run through inet_aton() to check syntax and make pretty. 74 return dns.ipv4.inet_ntoa(dns.ipv4.inet_aton(text)) 75 elif name.is_subdomain(ipv6_reverse_domain): 76 name = name.relativize(ipv6_reverse_domain) 77 labels = list(name.labels) 78 labels.reverse() 79 parts = [] 80 i = 0 81 l = len(labels) 82 while i < l: 83 parts.append(b''.join(labels[i:i + 4])) 84 i += 4 85 text = b':'.join(parts) 86 # run through inet_aton() to check syntax and make pretty. 87 return dns.ipv6.inet_ntoa(dns.ipv6.inet_aton(text)) 88 else: 89 raise dns.exception.SyntaxError('unknown reverse-map address family')90
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