# -*- coding: utf-8 -*-
#
# Copyright (C) 2010-2016 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/>.
#
"""modules backend"""
__all__ = [ "modules" ]
from firewall.core.prog import runProg
from firewall.core.logger import log
from firewall.config import COMMANDS
class modules(object):
def __init__(self):
self._load_command = COMMANDS["modprobe"]
# Use rmmod instead of modprobe -r (RHBZ#1031102)
self._unload_command = COMMANDS["rmmod"]
def __repr__(self):
return '%s' % (self.__class__)
def loaded_modules(self):
""" get all loaded kernel modules and their dependencies """
mods = [ ]
deps = { }
try:
with open("/proc/modules", "r") as f:
for line in f:
if not line:
break
line = line.strip()
splits = line.split()
mods.append(splits[0])
if splits[3] != "-":
deps[splits[0]] = splits[3].split(",")[:-1]
else:
deps[splits[0]] = [ ]
except FileNotFoundError:
pass
return mods, deps # [loaded modules], {module:[dependants]}
def load_module(self, module):
log.debug2("%s: %s %s", self.__class__, self._load_command, module)
return runProg(self._load_command, [ module ])
def unload_module(self, module):
log.debug2("%s: %s %s", self.__class__, self._unload_command, module)
return runProg(self._unload_command, [ module ])
def get_deps(self, module, deps, ret):
""" get all dependants of a module """
if module not in deps:
return
for mod in deps[module]:
self.get_deps(mod, deps, ret)
if mod not in ret:
ret.append(mod)
if module not in ret:
ret.append(module)
def get_firewall_modules(self):
""" get all loaded firewall-related modules """
mods = [ ]
(mods2, deps) = self.loaded_modules()
self.get_deps("nf_conntrack", deps, mods)
# these modules don't have dependants listed in /proc/modules
for bad_bad_module in ["nf_conntrack_ipv4", "nf_conntrack_ipv6"]:
if bad_bad_module in mods:
# move them to end of list, so we'll remove them later
mods.remove(bad_bad_module)
mods.insert(-1, bad_bad_module)
for mod in mods2:
if mod in [ "ip_tables", "ip6_tables", "ebtables" ] or \
mod.startswith("iptable_") or mod.startswith("ip6table_") or \
mod.startswith("nf_") or mod.startswith("xt_") or \
mod.startswith("ipt_") or mod.startswith("ip6t_") :
self.get_deps(mod, deps, mods)
return mods
def unload_firewall_modules(self):
""" unload all firewall-related modules """
for module in self.get_firewall_modules():
(status, ret) = self.unload_module(module)
if status != 0:
log.debug1("Failed to unload module '%s': %s" %(module, ret))
