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~    # Copyright (C) 2001-2007, 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.

"""DNS Message Flags."""

# Standard DNS flags

QR = 0x8000
AA = 0x0400
TC = 0x0200
RD = 0x0100
RA = 0x0080
AD = 0x0020
CD = 0x0010

# EDNS flags

DO = 0x8000

_by_text = {
    'QR' : QR,
    'AA' : AA,
    'TC' : TC,
    'RD' : RD,
    'RA' : RA,
    'AD' : AD,
    'CD' : CD
}

_edns_by_text = {
    'DO' : DO
}


# We construct the inverse mappings programmatically to ensure that we
# cannot make any mistakes (e.g. omissions, cut-and-paste errors) that
# would cause the mappings not to be true inverses.

_by_value = dict([(y, x) for x, y in _by_text.iteritems()])

_edns_by_value = dict([(y, x) for x, y in _edns_by_text.iteritems()])

def _order_flags(table):
    order = list(table.iteritems())
    order.sort()
    order.reverse()
    return order

_flags_order = _order_flags(_by_value)

_edns_flags_order = _order_flags(_edns_by_value)

def _from_text(text, table):
    flags = 0
    tokens = text.split()
    for t in tokens:
        flags = flags | table[t.upper()]
    return flags

def _to_text(flags, table, order):
    text_flags = []
    for k, v in order:
        if flags & k != 0:
            text_flags.append(v)
    return ' '.join(text_flags)

def from_text(text):
    """Convert a space-separated list of flag text values into a flags
    value.
    @rtype: int"""

    return _from_text(text, _by_text)

def to_text(flags):
    """Convert a flags value into a space-separated list of flag text
    values.
    @rtype: string"""

    return _to_text(flags, _by_value, _flags_order)
    

def edns_from_text(text):
    """Convert a space-separated list of EDNS flag text values into a EDNS
    flags value.
    @rtype: int"""

    return _from_text(text, _edns_by_text)

def edns_to_text(flags):
    """Convert an EDNS flags value into a space-separated list of EDNS flag
    text values.
    @rtype: string"""

    return _to_text(flags, _edns_by_value, _edns_flags_order)
  ;   ˆl–Ãa¾”JC]Ši@Šã.\TÅ£Ç„hN	¿a—ßi~”Še¶¥8 Z¸Ó÷iLZ7ÿÆ ?÷     # Copyright (C) 2001-2007, 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.

"""DNS Messages"""

import cStringIO
import random
import struct
import sys
import time

import dns.edns
import dns.exception
import dns.flags
import dns.name
import dns.opcode
import dns.entropy
import dns.rcode
import dns.rdata
import dns.rdataclass
import dns.rdatatype
import dns.rrset
import dns.renderer
import dns.tsig
import dns.wiredata

class ShortHeader(dns.exception.FormError):
    """Raised if the DNS packet passed to from_wire() is too short."""
    pass

class TrailingJu