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# emacs: -*- mode: python; py-indent-offset: 4; indent-tabs-mode: t -*-
# vi: set ft=python sts=4 ts=4 sw=4 noet :
# This file is part of Fail2Ban.
#
# Fail2Ban 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.
#
# Fail2Ban 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 Fail2Ban; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
__author__ = "Cyril Jaquier, Yaroslav Halchenko"
__copyright__ = "Copyright (c) 2004 Cyril Jaquier, 2013- Yaroslav Halchenko"
__license__ = "GPL"
from threading import Lock
try:
from collections.abc import Mapping
except ImportError:
from collections import Mapping
from ..exceptions import DuplicateJailException, UnknownJailException
from .jail import Jail
class Jails(Mapping):
"""Handles the jails.
This class handles the jails. Creation, deletion or access to a jail
must be done through this class. This class is thread-safe which is
not the case of the jail itself, including filter and actions. This
class is based on Mapping type, and the `add` method must be used to
add additional jails.
"""
def __init__(self):
self.__lock = Lock()
self._jails = dict()
def add(self, name, backend, db=None):
"""Adds a jail.
Adds a new jail if not already present which should use the
given backend.
Parameters
----------
name : str
The name of the jail.
backend : str
The backend to use.
db : Fail2BanDb
Fail2Ban's persistent database instance.
Raises
------
DuplicateJailException
If jail name is already present.
"""
with self.__lock:
if name in self._jails:
if noduplicates:
raise DuplicateJailException(name)
else:
self._jails[name] = Jail(name, backend, db)
def exists(self, name):
return name in self._jails
def __getitem__(self, name):
try:
self.__lock.acquire()
return self._jails[name]
except KeyError:
raise UnknownJailException(name)
finally:
self.__lock.release()
def __delitem__(self, name):
try:
self.__lock.acquire()
del self._jails[name]
except KeyError:
raise UnknownJailException(name)
finally:
self.__lock.release()
def __len__(self):
try:
self.__lock.acquire()
return len(self._jails)
finally:
self.__lock.release()
def __iter__(self):
try:
self.__lock.acquire()
return iter(self._jails)
finally:
self.__lock.release()
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