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File Content: `nodecon.py`

# Copyright 2016, Tresys Technology, LLC
# Copyright 2017, Chris PeBenito <pebenito@ieee.org>
#
# SPDX-License-Identifier: LGPL-2.1-only
#
from typing import NamedTuple

from ..policyrep import Context, Nodecon

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


class ModifiedNodecon(NamedTuple):

    """Difference details for a modified netifcon."""

    rule: Nodecon
    added_context: Context
    removed_context: 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) -> None:
        """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(ModifiedNodecon(left_nodecon,
                                                              right_nodecon.context,
                                                              left_nodecon.context))

    #
    # Internal functions
    #
    def _reset_diff(self) -> None:
        """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[Nodecon]):

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

    __slots__ = ("ip_version", "network")

    def __init__(self, ocon: Nodecon) -> None:
        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

Name	Size	Permission
__pycache__	---	0755
__init__.py	2585 bytes	0644
bool.py	2486 bytes	0644
bounds.py	3782 bytes	0644
commons.py	2199 bytes	0644
conditional.py	1256 bytes	0644
constraints.py	8396 bytes	0644
context.py	1394 bytes	0644
default.py	3624 bytes	0644
descriptors.py	1063 bytes	0644
difference.py	5488 bytes	0644
fsuse.py	2550 bytes	0644
genfscon.py	2719 bytes	0644
ibendportcon.py	2641 bytes	0644
ibpkeycon.py	2654 bytes	0644
initsid.py	2001 bytes	0644
mls.py	10147 bytes	0644
mlsrules.py	4656 bytes	0644
netifcon.py	3127 bytes	0644
nodecon.py	2653 bytes	0644
objclass.py	3156 bytes	0644
polcap.py	1121 bytes	0644
portcon.py	2632 bytes	0644
properties.py	1820 bytes	0644
rbacrules.py	6554 bytes	0644
roles.py	2726 bytes	0644
terules.py	24669 bytes	0644
typeattr.py	2863 bytes	0644
types.py	4271 bytes	0644
typing.py	458 bytes	0644
users.py	5481 bytes	0644

File Content: nodecon.py

File Content: `nodecon.py`