Source code for dns.rdtypes.IN.WKS

# Copyright (C) Dnspython Contributors, see LICENSE for text of ISC license

# 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 socket
import struct

import dns.immutable
import dns.ipv4
import dns.rdata

try:
    _proto_tcp = socket.getprotobyname("tcp")
    _proto_udp = socket.getprotobyname("udp")
except OSError:
    # Fall back to defaults in case /etc/protocols is unavailable.
    _proto_tcp = 6
    _proto_udp = 17


[docs] @dns.immutable.immutable class WKS(dns.rdata.Rdata): """WKS record""" # see: RFC 1035 __slots__ = ["address", "protocol", "bitmap"] def __init__(self, rdclass, rdtype, address, protocol, bitmap): super().__init__(rdclass, rdtype) self.address = self._as_ipv4_address(address) self.protocol = self._as_uint8(protocol) self.bitmap = self._as_bytes(bitmap)
[docs] def to_text(self, origin=None, relativize=True, **kw): bits = [] for i, byte in enumerate(self.bitmap): for j in range(0, 8): if byte & (0x80 >> j): bits.append(str(i * 8 + j)) text = " ".join(bits) return "%s %d %s" % (self.address, self.protocol, text)
@classmethod def from_text( cls, rdclass, rdtype, tok, origin=None, relativize=True, relativize_to=None ): address = tok.get_string() protocol = tok.get_string() if protocol.isdigit(): protocol = int(protocol) else: protocol = socket.getprotobyname(protocol) bitmap = bytearray() for token in tok.get_remaining(): value = token.unescape().value if value.isdigit(): serv = int(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(value, protocol_text) i = serv // 8 l = len(bitmap) if l < i + 1: for _ in range(l, i + 1): bitmap.append(0) bitmap[i] = bitmap[i] | (0x80 >> (serv % 8)) bitmap = dns.rdata._truncate_bitmap(bitmap) return cls(rdclass, rdtype, address, protocol, bitmap) def _to_wire(self, file, compress=None, origin=None, canonicalize=False): file.write(dns.ipv4.inet_aton(self.address)) protocol = struct.pack("!B", self.protocol) file.write(protocol) file.write(self.bitmap) @classmethod def from_wire_parser(cls, rdclass, rdtype, parser, origin=None): address = parser.get_bytes(4) protocol = parser.get_uint8() bitmap = parser.get_remaining() return cls(rdclass, rdtype, address, protocol, bitmap)