| # Copyright (C) 2003-2007, 2009, 2010 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 socket |
| import struct |
| |
| import dns.ipv4 |
| import dns.rdata |
| |
| _proto_tcp = socket.getprotobyname('tcp') |
| _proto_udp = socket.getprotobyname('udp') |
| |
| class WKS(dns.rdata.Rdata): |
| """WKS record |
| |
| @ivar address: the address |
| @type address: string |
| @ivar protocol: the protocol |
| @type protocol: int |
| @ivar bitmap: the bitmap |
| @type bitmap: string |
| @see: RFC 1035""" |
| |
| __slots__ = ['address', 'protocol', 'bitmap'] |
| |
| def __init__(self, rdclass, rdtype, address, protocol, bitmap): |
| super(WKS, self).__init__(rdclass, rdtype) |
| self.address = address |
| self.protocol = protocol |
| self.bitmap = bitmap |
| |
| def to_text(self, origin=None, relativize=True, **kw): |
| bits = [] |
| for i in xrange(0, len(self.bitmap)): |
| byte = ord(self.bitmap[i]) |
| for j in xrange(0, 8): |
| if byte & (0x80 >> j): |
| bits.append(str(i * 8 + j)) |
| text = ' '.join(bits) |
| return '%s %d %s' % (self.address, self.protocol, text) |
| |
| def from_text(cls, rdclass, rdtype, tok, origin = None, relativize = True): |
| address = tok.get_string() |
| protocol = tok.get_string() |
| if protocol.isdigit(): |
| protocol = int(protocol) |
| else: |
| protocol = socket.getprotobyname(protocol) |
| bitmap = [] |
| while 1: |
| token = tok.get().unescape() |
| if token.is_eol_or_eof(): |
| break |
| if token.value.isdigit(): |
| serv = int(token.value) |
| else: |
| if protocol != _proto_udp and protocol != _proto_tcp: |
| raise NotImplementedError("protocol must be TCP or UDP") |
| if protocol == _proto_udp: |
| protocol_text = "udp" |
| else: |
| protocol_text = "tcp" |
| serv = socket.getservbyname(token.value, protocol_text) |
| i = serv // 8 |
| l = len(bitmap) |
| if l < i + 1: |
| for j in xrange(l, i + 1): |
| bitmap.append('\x00') |
| bitmap[i] = chr(ord(bitmap[i]) | (0x80 >> (serv % 8))) |
| bitmap = dns.rdata._truncate_bitmap(bitmap) |
| return cls(rdclass, rdtype, address, protocol, bitmap) |
| |
| from_text = classmethod(from_text) |
| |
| def to_wire(self, file, compress = None, origin = None): |
| file.write(dns.ipv4.inet_aton(self.address)) |
| protocol = struct.pack('!B', self.protocol) |
| file.write(protocol) |
| file.write(self.bitmap) |
| |
| def from_wire(cls, rdclass, rdtype, wire, current, rdlen, origin = None): |
| address = dns.ipv4.inet_ntoa(wire[current : current + 4]) |
| protocol, = struct.unpack('!B', wire[current + 4 : current + 5]) |
| current += 5 |
| rdlen -= 5 |
| bitmap = wire[current : current + rdlen] |
| return cls(rdclass, rdtype, address, protocol, bitmap) |
| |
| from_wire = classmethod(from_wire) |
| |
| def _cmp(self, other): |
| sa = dns.ipv4.inet_aton(self.address) |
| oa = dns.ipv4.inet_aton(other.address) |
| v = cmp(sa, oa) |
| if v == 0: |
| sp = struct.pack('!B', self.protocol) |
| op = struct.pack('!B', other.protocol) |
| v = cmp(sp, op) |
| if v == 0: |
| v = cmp(self.bitmap, other.bitmap) |
| return v |