Edit: SOA.py
# Copyright (C) 2003-2007, 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. import struct import dns.exception import dns.rdata import dns.name class SOA(dns.rdata.Rdata): """SOA record @ivar mname: the SOA MNAME (master name) field @type mname: dns.name.Name object @ivar rname: the SOA RNAME (responsible name) field @type rname: dns.name.Name object @ivar serial: The zone's serial number @type serial: int @ivar refresh: The zone's refresh value (in seconds) @type refresh: int @ivar retry: The zone's retry value (in seconds) @type retry: int @ivar expire: The zone's expiration value (in seconds) @type expire: int @ivar minimum: The zone's negative caching time (in seconds, called "minimum" for historical reasons) @type minimum: int @see: RFC 1035""" __slots__ = ['mname', 'rname', 'serial', 'refresh', 'retry', 'expire', 'minimum'] def __init__(self, rdclass, rdtype, mname, rname, serial, refresh, retry, expire, minimum): super(SOA, self).__init__(rdclass, rdtype) self.mname = mname self.rname = rname self.serial = serial self.refresh = refresh self.retry = retry self.expire = expire self.minimum = minimum def to_text(self, origin=None, relativize=True, **kw): mname = self.mname.choose_relativity(origin, relativize) rname = self.rname.choose_relativity(origin, relativize) return '%s %s %d %d %d %d %d' % ( mname, rname, self.serial, self.refresh, self.retry, self.expire, self.minimum) @classmethod def from_text(cls, rdclass, rdtype, tok, origin=None, relativize=True): mname = tok.get_name() rname = tok.get_name() mname = mname.choose_relativity(origin, relativize) rname = rname.choose_relativity(origin, relativize) serial = tok.get_uint32() refresh = tok.get_ttl() retry = tok.get_ttl() expire = tok.get_ttl() minimum = tok.get_ttl() tok.get_eol() return cls(rdclass, rdtype, mname, rname, serial, refresh, retry, expire, minimum) def to_wire(self, file, compress=None, origin=None): self.mname.to_wire(file, compress, origin) self.rname.to_wire(file, compress, origin) five_ints = struct.pack('!IIIII', self.serial, self.refresh, self.retry, self.expire, self.minimum) file.write(five_ints) def to_digestable(self, origin=None): return self.mname.to_digestable(origin) + \ self.rname.to_digestable(origin) + \ struct.pack('!IIIII', self.serial, self.refresh, self.retry, self.expire, self.minimum) @classmethod def from_wire(cls, rdclass, rdtype, wire, current, rdlen, origin=None): (mname, cused) = dns.name.from_wire(wire[: current + rdlen], current) current += cused rdlen -= cused (rname, cused) = dns.name.from_wire(wire[: current + rdlen], current) current += cused rdlen -= cused if rdlen != 20: raise dns.exception.FormError five_ints = struct.unpack('!IIIII', wire[current: current + rdlen]) if origin is not None: mname = mname.relativize(origin) rname = rname.relativize(origin) return cls(rdclass, rdtype, mname, rname, five_ints[0], five_ints[1], five_ints[2], five_ints[3], five_ints[4]) def choose_relativity(self, origin=None, relativize=True): self.mname = self.mname.choose_relativity(origin, relativize) self.rname = self.rname.choose_relativity(origin, relativize)
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