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, 2009-2011 Nominum, Inc. 
  2  # 
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  4  # documentation for any purpose with or without fee is hereby granted, 
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 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].unwrap() 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