Package dns :: Package rdtypes :: Package IN :: Module WKS |
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# Source Code for Module dns.rdtypes.IN.WKS

      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 socket
     17  import struct
     18
     19  import dns.ipv4
     20  import dns.rdata
     21
     22  _proto_tcp = socket.getprotobyname('tcp')
     23  _proto_udp = socket.getprotobyname('udp')
     24
     25 -class WKS(dns.rdata.Rdata):
     26      """WKS record
     27
     28      @ivar address: the address
     29      @type address: string
     30      @ivar protocol: the protocol
     31      @type protocol: int
     32      @ivar bitmap: the bitmap
     33      @type bitmap: string
     34      @see: RFC 1035"""
     35
     36      __slots__ = ['address', 'protocol', 'bitmap']
     37
     38 -    def __init__(self, rdclass, rdtype, address, protocol, bitmap):
     39          super(WKS, self).__init__(rdclass, rdtype)
     40          self.address = address
     41          self.protocol = protocol
     42          self.bitmap = bitmap
     43
     44 -    def to_text(self, origin=None, relativize=True, **kw):
     45          bits = []
     46          for i in xrange(0, len(self.bitmap)):
     47              byte = ord(self.bitmap[i])
     48              for j in xrange(0, 8):
     49                  if byte & (0x80 >> j):
     50                      bits.append(str(i * 8 + j))
     51          text = ' '.join(bits)
     52          return '%s %d %s' % (self.address, self.protocol, text)
     53
     54 -    def from_text(cls, rdclass, rdtype, tok, origin = None, relativize = True):
     55          address = tok.get_string()
     56          protocol = tok.get_string()
     57          if protocol.isdigit():
     58              protocol = int(protocol)
     59          else:
     60              protocol = socket.getprotobyname(protocol)
     61          bitmap = []
     62          while 1:
     63              token = tok.get().unescape()
     64              if token.is_eol_or_eof():
     65                  break
     66              if token.value.isdigit():
     67                  serv = int(token.value)
     68              else:
     69                  if protocol != _proto_udp and protocol != _proto_tcp:
     70                      raise NotImplementedError("protocol must be TCP or UDP")
     71                  if protocol == _proto_udp:
     72                      protocol_text = "udp"
     73                  else:
     74                      protocol_text = "tcp"
     75                  serv = socket.getservbyname(token.value, protocol_text)
     76              i = serv // 8
     77              l = len(bitmap)
     78              if l < i + 1:
     79                  for j in xrange(l, i + 1):
     80                      bitmap.append('\x00')
     81              bitmap[i] = chr(ord(bitmap[i]) | (0x80 >> (serv % 8)))
     82          bitmap = dns.rdata._truncate_bitmap(bitmap)
     83          return cls(rdclass, rdtype, address, protocol, bitmap)
     84
     85      from_text = classmethod(from_text)
     86
     87 -    def to_wire(self, file, compress = None, origin = None):
     88          file.write(dns.ipv4.inet_aton(self.address))
     89          protocol = struct.pack('!B', self.protocol)
     90          file.write(protocol)
     91          file.write(self.bitmap)
     92
     93 -    def from_wire(cls, rdclass, rdtype, wire, current, rdlen, origin = None):
     94          address = dns.ipv4.inet_ntoa(wire[current : current + 4])
     95          protocol, = struct.unpack('!B', wire[current + 4 : current + 5])
     96          current += 5
     97          rdlen -= 5
     98          bitmap = wire[current : current + rdlen]
     99          return cls(rdclass, rdtype, address, protocol, bitmap)
    100
    101      from_wire = classmethod(from_wire)
    102
    103 -    def _cmp(self, other):
    104          sa = dns.ipv4.inet_aton(self.address)
    105          oa = dns.ipv4.inet_aton(other.address)
    106          v = cmp(sa, oa)
    107          if v == 0:
    108              sp = struct.pack('!B', self.protocol)
    109              op = struct.pack('!B', other.protocol)
    110              v = cmp(sp, op)
    111              if v == 0:
    112                  v = cmp(self.bitmap, other.bitmap)
    113          return v
    114