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# Copyright 2016, Tresys Technology, LLC
#
# 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."""
def __init__(self, ocon):
self.origin = ocon
self.ip_version = ocon.ip_version
self.address = ocon.address
self.netmask = ocon.netmask
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.address == other.address and \
self.netmask == other.netmask
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