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# Copyright 2018, 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_ibendportcon_record = namedtuple("modified_ibendportcon", ["rule",
"added_context",
"removed_context"])
class IbendportconsDifference(Difference):
"""Determine the difference in ibendportcons between two policies."""
added_ibendportcons = DiffResultDescriptor("diff_ibendportcons")
removed_ibendportcons = DiffResultDescriptor("diff_ibendportcons")
modified_ibendportcons = DiffResultDescriptor("diff_ibendportcons")
def diff_ibendportcons(self):
"""Generate the difference in ibendportcons between the policies."""
self.log.info(
"Generating ibendportcon differences from {0.left_policy} to {0.right_policy}".
format(self))
self.added_ibendportcons, self.removed_ibendportcons, matched_ibendportcons = \
self._set_diff(
(IbendportconWrapper(n) for n in self.left_policy.ibendportcons()),
(IbendportconWrapper(n) for n in self.right_policy.ibendportcons()))
self.modified_ibendportcons = []
for left_ibep, right_ibep in matched_ibendportcons:
# Criteria for modified ibendportcons
# 1. change to context
if ContextWrapper(left_ibep.context) != ContextWrapper(right_ibep.context):
self.modified_ibendportcons.append(
modified_ibendportcon_record(left_ibep,
right_ibep.context,
left_ibep.context))
#
# Internal functions
#
def _reset_diff(self):
"""Reset diff results on policy changes."""
self.log.debug("Resetting ibendportcon differences")
self.added_ibendportcons = None
self.removed_ibendportcons = None
self.modified_ibendportcons = None
class IbendportconWrapper(Wrapper):
"""Wrap ibendportcon statements for diff purposes."""
__slots__ = ("name", "port")
def __init__(self, ocon):
self.origin = ocon
self.name = ocon.name
self.port = ocon.port
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.name == other.name and \
self.port == other.port