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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_ibpkeycon_record = namedtuple("modified_ibpkeycon", ["rule", "added_context", "removed_context"]) class IbpkeyconsDifference(Difference): """Determine the difference in ibpkeycons between two policies.""" added_ibpkeycons = DiffResultDescriptor("diff_ibpkeycons") removed_ibpkeycons = DiffResultDescriptor("diff_ibpkeycons") modified_ibpkeycons = DiffResultDescriptor("diff_ibpkeycons") def diff_ibpkeycons(self): """Generate the difference in ibpkeycons between the policies.""" self.log.info( "Generating ibpkeycon differences from {0.left_policy} to {0.right_policy}". format(self)) self.added_ibpkeycons, self.removed_ibpkeycons, matched_ibpkeycons = \ self._set_diff( (IbpkeyconWrapper(n) for n in self.left_policy.ibpkeycons()), (IbpkeyconWrapper(n) for n in self.right_policy.ibpkeycons())) self.modified_ibpkeycons = [] for left_ibpkey, right_ibpkey in matched_ibpkeycons: # Criteria for modified ibpkeycons # 1. change to context if ContextWrapper(left_ibpkey.context) != ContextWrapper(right_ibpkey.context): self.modified_ibpkeycons.append( modified_ibpkeycon_record(left_ibpkey, right_ibpkey.context, left_ibpkey.context)) # # Internal functions # def _reset_diff(self): """Reset diff results on policy changes.""" self.log.debug("Resetting ibpkeycon differences") self.added_ibpkeycons = None self.removed_ibpkeycons = None self.modified_ibpkeycons = None class IbpkeyconWrapper(Wrapper): """Wrap ibpkeycon statements for diff purposes.""" __slots__ = ("subnet_prefix", "low", "high") def __init__(self, ocon): self.origin = ocon self.subnet_prefix = ocon.subnet_prefix self.low, self.high = ocon.pkeys 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.subnet_prefix == other.subnet_prefix and \ self.low == other.low and \ self.high == other.high