1# Copyright (C) 2003-2007, 2009, 2010 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 16import dns.exception 17import dns.ipv4 18import dns.rdata 19import dns.tokenizer 20 21class A(dns.rdata.Rdata): 22 """A record. 23 24 @ivar address: an IPv4 address 25 @type address: string (in the standard "dotted quad" format)""" 26 27 __slots__ = ['address'] 28 29 def __init__(self, rdclass, rdtype, address): 30 super(A, self).__init__(rdclass, rdtype) 31 # check that it's OK 32 junk = dns.ipv4.inet_aton(address) 33 self.address = address 34 35 def to_text(self, origin=None, relativize=True, **kw): 36 return self.address 37 38 def from_text(cls, rdclass, rdtype, tok, origin = None, relativize = True): 39 address = tok.get_identifier() 40 tok.get_eol() 41 return cls(rdclass, rdtype, address) 42 43 from_text = classmethod(from_text) 44 45 def to_wire(self, file, compress = None, origin = None): 46 file.write(dns.ipv4.inet_aton(self.address)) 47 48 def from_wire(cls, rdclass, rdtype, wire, current, rdlen, origin = None): 49 address = dns.ipv4.inet_ntoa(wire[current : current + rdlen]) 50 return cls(rdclass, rdtype, address) 51 52 from_wire = classmethod(from_wire) 53 54 def _cmp(self, other): 55 sa = dns.ipv4.inet_aton(self.address) 56 oa = dns.ipv4.inet_aton(other.address) 57 return cmp(sa, oa) 58