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Issue #20480: Add ipaddress.reverse_pointer. Patch by Leon Weber.

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This commit is contained in:
Eric V. Smith 2014-04-14 12:58:07 -04:00
parent 6b23088035
commit ebdaaf4087
5 changed files with 55 additions and 0 deletions
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29
Lib/ipaddress.py
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@ -435,6 +435,17 @@ class _IPAddressBase(_TotalOrderingMixin):
"""Return the shorthand version of the IP address as a string."""
return str(self)
@property
def reverse_pointer(self):
"""The name of the reverse DNS pointer for the IP address, e.g.:
>>> ipaddress.ip_address("127.0.0.1").reverse_pointer
'1.0.0.127.in-addr.arpa'
>>> ipaddress.ip_address("2001:db8::1").reverse_pointer
'1.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.8.b.d.0.1.0.0.2.ip6.arpa'
"""
return self._reverse_pointer()
@property
def version(self):
msg = '%200s has no version specified' % (type(self),)
@ -1221,6 +1232,15 @@ class _BaseV4:
return True
return False
def _reverse_pointer(self):
"""Return the reverse DNS pointer name for the IPv4 address.
This implements the method described in RFC1035 3.5.
"""
reverse_octets = str(self).split('.')[::-1]
return '.'.join(reverse_octets) + '.in-addr.arpa'
@property
def max_prefixlen(self):
return self._max_prefixlen
@ -1784,6 +1804,15 @@ class _BaseV6:
return '%s/%d' % (':'.join(parts), self._prefixlen)
return ':'.join(parts)
def _reverse_pointer(self):
"""Return the reverse DNS pointer name for the IPv6 address.
This implements the method described in RFC3596 2.5.
"""
reverse_chars = self.exploded[::-1].replace(':', '')
return '.'.join(reverse_chars) + '.ip6.arpa'
@property
def max_prefixlen(self):
return self._max_prefixlen