Package dns :: Package rdtypes :: Package ANY :: Module SOA |
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# Source Code for Module dns.rdtypes.ANY.SOA

      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
     16  import struct
     17
     18  import dns.exception
     19  import dns.rdata
     20  import dns.name
     21
     22 -class SOA(dns.rdata.Rdata):
     23      """SOA record
     24
     25      @ivar mname: the SOA MNAME (master name) field
     26      @type mname: dns.name.Name object
     27      @ivar rname: the SOA RNAME (responsible name) field
     28      @type rname: dns.name.Name object
     29      @ivar serial: The zone's serial number
     30      @type serial: int
     31      @ivar refresh: The zone's refresh value (in seconds)
     32      @type refresh: int
     33      @ivar retry: The zone's retry value (in seconds)
     34      @type retry: int
     35      @ivar expire: The zone's expiration value (in seconds)
     36      @type expire: int
     37      @ivar minimum: The zone's negative caching time (in seconds, called
     38      "minimum" for historical reasons)
     39      @type minimum: int
     40      @see: RFC 1035"""
     41
     42      __slots__ = ['mname', 'rname', 'serial', 'refresh', 'retry', 'expire',
     43                   'minimum']
     44
     45 -    def __init__(self, rdclass, rdtype, mname, rname, serial, refresh, retry,
     46                   expire, minimum):
     47          super(SOA, self).__init__(rdclass, rdtype)
     48          self.mname = mname
     49          self.rname = rname
     50          self.serial = serial
     51          self.refresh = refresh
     52          self.retry = retry
     53          self.expire = expire
     54          self.minimum = minimum
     55
     56 -    def to_text(self, origin=None, relativize=True, **kw):
     57          mname = self.mname.choose_relativity(origin, relativize)
     58          rname = self.rname.choose_relativity(origin, relativize)
     59          return '%s %s %d %d %d %d %d' % (
     60              mname, rname, self.serial, self.refresh, self.retry,
     61              self.expire, self.minimum )
     62
     63 -    def from_text(cls, rdclass, rdtype, tok, origin = None, relativize = True):
     64          mname = tok.get_name()
     65          rname = tok.get_name()
     66          mname = mname.choose_relativity(origin, relativize)
     67          rname = rname.choose_relativity(origin, relativize)
     68          serial = tok.get_uint32()
     69          refresh = tok.get_ttl()
     70          retry = tok.get_ttl()
     71          expire = tok.get_ttl()
     72          minimum = tok.get_ttl()
     73          tok.get_eol()
     74          return cls(rdclass, rdtype, mname, rname, serial, refresh, retry,
     75                     expire, minimum )
     76
     77      from_text = classmethod(from_text)
     78
     79 -    def to_wire(self, file, compress = None, origin = None):
     80          self.mname.to_wire(file, compress, origin)
     81          self.rname.to_wire(file, compress, origin)
     82          five_ints = struct.pack('!IIIII', self.serial, self.refresh,
     83                                  self.retry, self.expire, self.minimum)
     84          file.write(five_ints)
     85
     86 -    def to_digestable(self, origin = None):
     87          return self.mname.to_digestable(origin) + \
     88              self.rname.to_digestable(origin) + \
     89              struct.pack('!IIIII', self.serial, self.refresh,
     90                          self.retry, self.expire, self.minimum)
     91
     92 -    def from_wire(cls, rdclass, rdtype, wire, current, rdlen, origin = None):
     93          (mname, cused) = dns.name.from_wire(wire[: current + rdlen], current)
     94          current += cused
     95          rdlen -= cused
     96          (rname, cused) = dns.name.from_wire(wire[: current + rdlen], current)
     97          current += cused
     98          rdlen -= cused
     99          if rdlen != 20:
    100              raise dns.exception.FormError
    101          five_ints = struct.unpack('!IIIII',
    102                                    wire[current : current + rdlen])
    103          if not origin is None:
    104              mname = mname.relativize(origin)
    105              rname = rname.relativize(origin)
    106          return cls(rdclass, rdtype, mname, rname,
    107                     five_ints[0], five_ints[1], five_ints[2], five_ints[3],
    108                     five_ints[4])
    109
    110      from_wire = classmethod(from_wire)
    111
    112 -    def choose_relativity(self, origin = None, relativize = True):
    113          self.mname = self.mname.choose_relativity(origin, relativize)
    114          self.rname = self.rname.choose_relativity(origin, relativize)
    115
    116 -    def _cmp(self, other):
    117          v = cmp(self.mname, other.mname)
    118          if v == 0:
    119              v = cmp(self.rname, other.rname)
    120              if v == 0:
    121                  self_ints = struct.pack('!IIIII', self.serial, self.refresh,
    122                                          self.retry, self.expire, self.minimum)
    123                  other_ints = struct.pack('!IIIII', other.serial, other.refresh,
    124                                           other.retry, other.expire,
    125                                           other.minimum)
    126                  v = cmp(self_ints, other_ints)
    127          return v
    128