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File Name : node.py

# 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 nodes.  A node is a set of rdatasets."""

import StringIO

import dns.rdataset
import dns.rdatatype
import dns.renderer

class Node(object):
    """A DNS node.

A node is a set of rdatasets

@ivar rdatasets: the node's rdatasets
    @type rdatasets: list of dns.rdataset.Rdataset objects"""

__slots__ = ['rdatasets']

def __init__(self):
        """Initialize a DNS node.
        """

self.rdatasets = [];

def to_text(self, name, **kw):
        """Convert a node to text format.

Each rdataset at the node is printed.  Any keyword arguments
        to this method are passed on to the rdataset's to_text() method.
        @param name: the owner name of the rdatasets
        @type name: dns.name.Name object
        @rtype: string
        """

s = StringIO.StringIO()
        for rds in self.rdatasets:
            if len(rds) > 0:
                print >> s, rds.to_text(name, **kw)
        return s.getvalue()[:-1]

def __repr__(self):
        return '<DNS node ' + str(id(self)) + '>'

def __eq__(self, other):
        """Two nodes are equal if they have the same rdatasets.

@rtype: bool
        """
        #
        # This is inefficient.  Good thing we don't need to do it much.
        #
        for rd in self.rdatasets:
            if rd not in other.rdatasets:
                return False
        for rd in other.rdatasets:
            if rd not in self.rdatasets:
                return False
        return True

def __ne__(self, other):
        return not self.__eq__(other)

def __len__(self):
        return len(self.rdatasets)

def __iter__(self):
        return iter(self.rdatasets)

def find_rdataset(self, rdclass, rdtype, covers=dns.rdatatype.NONE,
                      create=False):
        """Find an rdataset matching the specified properties in the
        current node.

@param rdclass: The class of the rdataset
        @type rdclass: int
        @param rdtype: The type of the rdataset
        @type rdtype: int
        @param covers: The covered type.  Usually this value is
        dns.rdatatype.NONE, but if the rdtype is dns.rdatatype.SIG or
        dns.rdatatype.RRSIG, then the covers value will be the rdata
        type the SIG/RRSIG covers.  The library treats the SIG and RRSIG
        types as if they were a family of
        types, e.g. RRSIG(A), RRSIG(NS), RRSIG(SOA).  This makes RRSIGs much
        easier to work with than if RRSIGs covering different rdata
        types were aggregated into a single RRSIG rdataset.
        @type covers: int
        @param create: If True, create the rdataset if it is not found.
        @type create: bool
        @raises KeyError: An rdataset of the desired type and class does
        not exist and I{create} is not True.
        @rtype: dns.rdataset.Rdataset object
        """

for rds in self.rdatasets:
            if rds.match(rdclass, rdtype, covers):
                return rds
        if not create:
            raise KeyError
        rds = dns.rdataset.Rdataset(rdclass, rdtype)
        self.rdatasets.append(rds)
        return rds

def get_rdataset(self, rdclass, rdtype, covers=dns.rdatatype.NONE,
                     create=False):
        """Get an rdataset matching the specified properties in the
        current node.

None is returned if an rdataset of the specified type and
        class does not exist and I{create} is not True.

@param rdclass: The class of the rdataset
        @type rdclass: int
        @param rdtype: The type of the rdataset
        @type rdtype: int
        @param covers: The covered type.
        @type covers: int
        @param create: If True, create the rdataset if it is not found.
        @type create: bool
        @rtype: dns.rdataset.Rdataset object or None
        """

try:
            rds = self.find_rdataset(rdclass, rdtype, covers, create)
        except KeyError:
            rds = None
        return rds

def delete_rdataset(self, rdclass, rdtype, covers=dns.rdatatype.NONE):
        """Delete the rdataset matching the specified properties in the
        current node.

If a matching rdataset does not exist, it is not an error.

@param rdclass: The class of the rdataset
        @type rdclass: int
        @param rdtype: The type of the rdataset
        @type rdtype: int
        @param covers: The covered type.
        @type covers: int
        """

rds = self.get_rdataset(rdclass, rdtype, covers)
        if not rds is None:
            self.rdatasets.remove(rds)

def replace_rdataset(self, replacement):
        """Replace an rdataset.

It is not an error if there is no rdataset matching I{replacement}.

Ownership of the I{replacement} object is transferred to the node;
        in other words, this method does not store a copy of I{replacement}
        at the node, it stores I{replacement} itself.
        """

if not isinstance(replacement, dns.rdataset.Rdataset):
            raise ValueError, 'replacement is not an rdataset'
        self.delete_rdataset(replacement.rdclass, replacement.rdtype,
                             replacement.covers)
        self.rdatasets.append(replacement)

Name	Type	Size	Owner/Group	Permission	Last Modified	Actions
.	dir	-	root/root	0755	2016-10-25 06:34:32
..	dir	-	root/root	0755	2020-07-28 03:51:18
rdtypes	dir	-	root/root	0755	2016-10-25 06:34:32
__init__.py	text/plain	1.3 KB	root/root	0644	2011-07-09 02:05:20
__init__.pyc	application/octet-stream	774 B	root/root	0644	2016-02-10 09:07:14
__init__.pyo	application/octet-stream	774 B	root/root	0644	2016-02-10 09:07:14
dnssec.py	text/x-python	14.37 KB	root/root	0644	2014-05-31 06:00:16
dnssec.pyc	application/octet-stream	13.68 KB	root/root	0644	2016-02-10 09:07:14
dnssec.pyo	application/octet-stream	13.6 KB	root/root	0644	2016-02-10 09:07:14
e164.py	text/x-python	3.01 KB	root/root	0644	2012-04-08 12:58:54
e164.pyc	application/octet-stream	2.79 KB	root/root	0644	2016-02-10 09:07:14
e164.pyo	application/octet-stream	2.79 KB	root/root	0644	2016-02-10 09:07:14
edns.py	text/x-python	4.21 KB	root/root	0644	2012-05-21 05:33:34
edns.pyc	application/octet-stream	5.36 KB	root/root	0644	2016-02-10 09:07:14
edns.pyo	application/octet-stream	5.36 KB	root/root	0644	2016-02-10 09:07:14
entropy.py	text/x-python	3.79 KB	root/root	0644	2011-07-09 02:05:20
entropy.pyc	application/octet-stream	3.8 KB	root/root	0644	2016-02-10 09:07:14
entropy.pyo	application/octet-stream	3.8 KB	root/root	0644	2016-02-10 09:07:14
exception.py	text/x-python	1.29 KB	root/root	0644	2011-07-09 02:05:20
exception.pyc	application/octet-stream	1.62 KB	root/root	0644	2016-02-10 09:07:14
exception.pyo	application/octet-stream	1.62 KB	root/root	0644	2016-02-10 09:07:14
flags.py	text/x-python	2.62 KB	root/root	0644	2011-07-09 02:05:20
flags.pyc	application/octet-stream	2.65 KB	root/root	0644	2016-02-10 09:07:14
flags.pyo	application/octet-stream	2.65 KB	root/root	0644	2016-02-10 09:07:14
grange.py	text/x-python	1.83 KB	root/root	0644	2013-07-07 11:18:14
grange.pyc	application/octet-stream	1.17 KB	root/root	0644	2016-02-10 09:07:14
grange.pyo	application/octet-stream	1.09 KB	root/root	0644	2016-02-10 09:07:14
hash.py	text/x-python	2.34 KB	root/root	0644	2011-07-09 02:05:20
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inet.py	text/x-python	3.16 KB	root/root	0644	2011-07-09 02:05:20
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ipv4.py	text/x-python	1.81 KB	root/root	0644	2012-04-08 01:19:08
ipv4.pyc	application/octet-stream	1.39 KB	root/root	0644	2016-02-10 09:07:14
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ipv6.py	text/x-python	4.97 KB	root/root	0644	2014-05-31 06:10:42
ipv6.pyc	application/octet-stream	3.47 KB	root/root	0644	2016-02-10 09:07:14
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message.py	text/x-python	41.63 KB	root/root	0644	2014-04-04 12:36:10
message.pyc	application/octet-stream	36.76 KB	root/root	0644	2016-02-10 09:07:14
message.pyo	application/octet-stream	36.76 KB	root/root	0644	2016-02-10 09:07:14
name.py	text/x-python	21.82 KB	root/root	0644	2014-06-19 12:35:06
name.pyc	application/octet-stream	23.44 KB	root/root	0644	2016-02-10 09:07:14
name.pyo	application/octet-stream	23.44 KB	root/root	0644	2016-02-10 09:07:14
namedict.py	text/x-python	2.06 KB	root/root	0644	2011-07-09 02:05:20
namedict.pyc	application/octet-stream	1.97 KB	root/root	0644	2016-02-10 09:07:14
namedict.pyo	application/octet-stream	1.97 KB	root/root	0644	2016-02-10 09:07:14
node.py	text/x-python	5.89 KB	root/root	0644	2013-02-26 04:44:56
node.pyc	application/octet-stream	6.27 KB	root/root	0644	2016-02-10 09:07:14
node.pyo	application/octet-stream	6.27 KB	root/root	0644	2016-02-10 09:07:14
opcode.py	text/x-python	2.55 KB	root/root	0644	2011-07-09 02:05:20
opcode.pyc	application/octet-stream	2.55 KB	root/root	0644	2016-02-10 09:07:14
opcode.pyo	application/octet-stream	2.55 KB	root/root	0644	2016-02-10 09:07:14
query.py	text/x-python	17.89 KB	root/root	0644	2014-06-21 03:33:24
query.pyc	application/octet-stream	15.47 KB	root/root	0644	2016-02-10 09:07:14
query.pyo	application/octet-stream	15.47 KB	root/root	0644	2016-02-10 09:07:14
rcode.py	text/x-python	3.03 KB	root/root	0644	2011-07-09 02:05:20
rcode.pyc	application/octet-stream	2.97 KB	root/root	0644	2016-02-10 09:07:14
rcode.pyo	application/octet-stream	2.97 KB	root/root	0644	2016-02-10 09:07:14
rdata.py	text/x-python	15.34 KB	root/root	0644	2011-07-18 10:04:48
rdata.pyc	application/octet-stream	16.93 KB	root/root	0644	2016-02-10 09:07:14
rdata.pyo	application/octet-stream	16.93 KB	root/root	0644	2016-02-10 09:07:14
rdataclass.py	text/x-python	3.22 KB	root/root	0644	2011-07-09 02:05:20
rdataclass.pyc	application/octet-stream	3 KB	root/root	0644	2016-02-10 09:07:14
rdataclass.pyo	application/octet-stream	3 KB	root/root	0644	2016-02-10 09:07:14
rdataset.py	text/x-python	11.28 KB	root/root	0644	2012-04-07 08:38:42
rdataset.pyc	application/octet-stream	11.27 KB	root/root	0644	2016-02-10 09:07:14
rdataset.pyo	application/octet-stream	11.22 KB	root/root	0644	2016-02-10 09:07:14
rdatatype.py	text/x-python	5.07 KB	root/root	0644	2012-09-25 04:35:40
rdatatype.pyc	application/octet-stream	5.34 KB	root/root	0644	2016-02-10 09:07:14
rdatatype.pyo	application/octet-stream	5.34 KB	root/root	0644	2016-02-10 09:07:14
renderer.py	text/x-python	11.63 KB	root/root	0644	2013-05-30 09:27:18
renderer.pyc	application/octet-stream	10.96 KB	root/root	0644	2016-02-10 09:07:14
renderer.pyo	application/octet-stream	10.85 KB	root/root	0644	2016-02-10 09:07:14
resolver.py	text/x-python	45.35 KB	root/root	0644	2014-06-21 04:12:54
resolver.pyc	application/octet-stream	37.7 KB	root/root	0644	2016-02-10 09:07:14
resolver.pyo	application/octet-stream	37.7 KB	root/root	0644	2016-02-10 09:07:14
reversename.py	text/x-python	3.03 KB	root/root	0644	2014-05-31 06:10:42
reversename.pyc	application/octet-stream	2.42 KB	root/root	0644	2016-02-10 09:07:14
reversename.pyo	application/octet-stream	2.42 KB	root/root	0644	2016-02-10 09:07:14
rrset.py	text/x-python	5.76 KB	root/root	0644	2011-07-09 02:05:20
rrset.pyc	application/octet-stream	6.3 KB	root/root	0644	2016-02-10 09:07:14
rrset.pyo	application/octet-stream	6.3 KB	root/root	0644	2016-02-10 09:07:14
set.py	text/x-python	7.66 KB	root/root	0644	2011-07-09 02:05:20
set.pyc	application/octet-stream	10.12 KB	root/root	0644	2016-02-10 09:07:14
set.pyo	application/octet-stream	10.12 KB	root/root	0644	2016-02-10 09:07:14
tokenizer.py	text/x-python	17.54 KB	root/root	0644	2014-04-11 02:55:02
tokenizer.pyc	application/octet-stream	17.26 KB	root/root	0644	2016-02-10 09:07:14
tokenizer.pyo	application/octet-stream	17.26 KB	root/root	0644	2016-02-10 09:07:14
tsig.py	text/x-python	8.1 KB	root/root	0644	2014-04-04 12:36:10
tsig.pyc	application/octet-stream	8.22 KB	root/root	0644	2016-02-10 09:07:14
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tsigkeyring.py	text/x-python	1.61 KB	root/root	0644	2013-09-01 11:11:46
tsigkeyring.pyc	application/octet-stream	1.19 KB	root/root	0644	2016-02-10 09:07:14
tsigkeyring.pyo	application/octet-stream	1.19 KB	root/root	0644	2016-02-10 09:07:14
ttl.py	text/x-python	2.13 KB	root/root	0644	2011-07-09 02:05:20
ttl.pyc	application/octet-stream	1.51 KB	root/root	0644	2016-02-10 09:07:14
ttl.pyo	application/octet-stream	1.51 KB	root/root	0644	2016-02-10 09:07:14
update.py	text/x-python	9.92 KB	root/root	0644	2011-07-09 02:05:20
update.pyc	application/octet-stream	8.36 KB	root/root	0644	2016-02-10 09:07:14
update.pyo	application/octet-stream	8.36 KB	root/root	0644	2016-02-10 09:07:14
version.py	text/plain	1.24 KB	root/root	0644	2014-09-01 12:42:54
version.pyc	application/octet-stream	569 B	root/root	0644	2016-02-10 09:07:14
version.pyo	application/octet-stream	569 B	root/root	0644	2016-02-10 09:07:14
wiredata.py	text/x-python	2.53 KB	root/root	0644	2014-07-24 02:35:36
wiredata.pyc	application/octet-stream	2.27 KB	root/root	0644	2016-02-10 09:07:14
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zone.py	text/x-python	37.94 KB	root/root	0644	2014-06-21 03:57:20
zone.pyc	application/octet-stream	33.93 KB	root/root	0644	2016-02-10 09:07:14
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