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Edit: fw_transaction.py
# -*- coding: utf-8 -*- # # Copyright (C) 2016 Red Hat, Inc. # # Authors: # Thomas Woerner <twoerner@redhat.com> # # This program is free software; you can redistribute it and/or modify # it under the terms of the GNU General Public License as published by # the Free Software Foundation; either version 2 of the License, or # (at your option) any later version. # # This program 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 General Public License for more details. # # You should have received a copy of the GNU General Public License # along with this program. If not, see <http://www.gnu.org/licenses/>. # """Transaction classes for firewalld""" __all__ = [ "FirewallTransaction" ] import traceback from firewall.core.logger import log from firewall import errors from firewall.errors import FirewallError class FirewallTransaction(object): def __init__(self, fw): self.fw = fw self.rules = { } # [ ( backend.name, [ rule,.. ] ),.. ] self.pre_funcs = [ ] # [ (func, args),.. ] self.post_funcs = [ ] # [ (func, args),.. ] self.fail_funcs = [ ] # [ (func, args),.. ] self.modules = [ ] # [ module,.. ] def clear(self): self.rules.clear() del self.pre_funcs[:] del self.post_funcs[:] del self.fail_funcs[:] def add_rule(self, backend, rule): self.rules.setdefault(backend.name, [ ]).append(rule) def add_rules(self, backend, rules): for rule in rules: self.add_rule(backend, rule) def query_rule(self, backend, rule): return backend.name in self.rules and rule in self.rules[backend.name] def remove_rule(self, backend, rule): if backend.name in self.rules and rule in self.rules[backend.name]: self.rules[backend.name].remove(rule) def add_pre(self, func, *args): self.pre_funcs.append((func, args)) def add_post(self, func, *args): self.post_funcs.append((func, args)) def add_fail(self, func, *args): self.fail_funcs.append((func, args)) def add_module(self, module): if module not in self.modules: self.modules.append(module) def remove_module(self, module): if module in self.modules: self.modules.remove(module) def add_modules(self, modules): for module in modules: self.add_module(module) def remove_modules(self, modules): for module in modules: self.remove_module(module) def prepare(self, enable): log.debug4("%s.prepare(%s, %s)" % (type(self), enable, "...")) rules = { } if not enable: # reverse rule order for cleanup for backend_name in self.rules: for rule in reversed(self.rules[backend_name]): rules.setdefault(backend_name, [ ]).append( self.fw.get_backend_by_name(backend_name).reverse_rule(rule)) else: for backend_name in self.rules: rules.setdefault(backend_name, [ ]).extend(self.rules[backend_name]) return rules, self.modules def execute(self, enable): log.debug4("%s.execute(%s)" % (type(self), enable)) rules, modules = self.prepare(enable) # pre self.pre() # stage 1: apply rules error = False errorMsg = "" done = [ ] for backend_name in rules: try: self.fw.rules(backend_name, rules[backend_name]) except Exception as msg: error = True errorMsg = msg log.debug1(traceback.format_exc()) log.error(msg) else: done.append(backend_name) # stage 2: load modules if not error: module_return = self.fw.handle_modules(modules, enable) if module_return: # Debug log about issues loading modules, but don't error. The # modules may be builtin or CONFIG_MODULES=n, in which case # modprobe will fail. Or we may be running inside a container # that doesn't have sufficient privileges. Unfortunately there # is no way for us to know. (status, msg) = module_return if status: log.debug1(msg) # error case: revert rules if error: undo_rules = { } for backend_name in done: undo_rules[backend_name] = [ ] for rule in reversed(rules[backend_name]): undo_rules[backend_name].append( self.fw.get_backend_by_name(backend_name).reverse_rule(rule)) for backend_name in undo_rules: try: self.fw.rules(backend_name, undo_rules[backend_name]) except Exception as msg: log.debug1(traceback.format_exc()) log.error(msg) # call failure functions for (func, args) in self.fail_funcs: try: func(*args) except Exception as msg: log.debug1(traceback.format_exc()) log.error("Calling fail func %s(%s) failed: %s" % \ (func, args, msg)) raise FirewallError(errors.COMMAND_FAILED, errorMsg) # post self.post() def pre(self): log.debug4("%s.pre()" % type(self)) for (func, args) in self.pre_funcs: func(*args) def post(self): log.debug4("%s.post()" % type(self)) for (func, args) in self.post_funcs: func(*args)