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name : nodecon.py
 # Copyright 2016, Tresys Technology, LLC
# Copyright 2017, Chris PeBenito <pebenito@ieee.org>
#
# This file is part of SETools.
#
# SETools is free software: you can redistribute it and/or modify
# it under the terms of the GNU Lesser General Public License as
# published by the Free Software Foundation, either version 2.1 of
# the License, or (at your option) any later version.
#
# SETools is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public
# License along with SETools.  If not, see
# <http://www.gnu.org/licenses/>.
#
from collections import namedtuple

from .context import ContextWrapper
from .descriptors import DiffResultDescriptor
from .difference import Difference, Wrapper


modified_nodecon_record = namedtuple("modified_nodecon", ["rule",
                                                          "added_context",
                                                          "removed_context"])


class NodeconsDifference(Difference):

    """Determine the difference in nodecons between two policies."""

    added_nodecons = DiffResultDescriptor("diff_nodecons")
    removed_nodecons = DiffResultDescriptor("diff_nodecons")
    modified_nodecons = DiffResultDescriptor("diff_nodecons")

    def diff_nodecons(self):
        """Generate the difference in nodecons between the policies."""

        self.log.info("Generating nodecon differences from {0.left_policy} to {0.right_policy}".
                      format(self))

        self.added_nodecons, self.removed_nodecons, matched_nodecons = self._set_diff(
            (NodeconWrapper(n) for n in self.left_policy.nodecons()),
            (NodeconWrapper(n) for n in self.right_policy.nodecons()))

        self.modified_nodecons = []

        for left_nodecon, right_nodecon in matched_nodecons:
            # Criteria for modified nodecons
            # 1. change to context
            if ContextWrapper(left_nodecon.context) != ContextWrapper(right_nodecon.context):
                self.modified_nodecons.append(modified_nodecon_record(left_nodecon,
                                                                      right_nodecon.context,
                                                                      left_nodecon.context))

    #
    # Internal functions
    #
    def _reset_diff(self):
        """Reset diff results on policy changes."""
        self.log.debug("Resetting nodecon differences")
        self.added_nodecons = None
        self.removed_nodecons = None
        self.modified_nodecons = None


class NodeconWrapper(Wrapper):

    """Wrap nodecon statements for diff purposes."""

    __slots__ = ("ip_version", "network")

    def __init__(self, ocon):
        self.origin = ocon
        self.ip_version = ocon.ip_version
        self.network = ocon.network
        self.key = hash(ocon)

    def __hash__(self):
        return self.key

    def __lt__(self, other):
        return self.origin < other.origin

    def __eq__(self, other):
        return self.ip_version == other.ip_version and \
            self.network == other.network
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