mirror of https://github.com/fail2ban/fail2ban
136 lines
3.6 KiB
Python
136 lines
3.6 KiB
Python
# emacs: -*- mode: python; py-indent-offset: 4; indent-tabs-mode: t -*-
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# vi: set ft=python sts=4 ts=4 sw=4 noet :
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# This file is part of Fail2Ban.
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#
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# Fail2Ban is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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#
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# Fail2Ban is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with Fail2Ban; if not, write to the Free Software
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# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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# Author: Cyril Jaquier
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#
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# $Revision$
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__author__ = "Cyril Jaquier"
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__version__ = "$Revision$"
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__date__ = "$Date$"
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__copyright__ = "Copyright (c) 2004 Cyril Jaquier"
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__license__ = "GPL"
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from failmanager import FailManagerEmpty
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from filter import FileFilter
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from mytime import MyTime
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import time, logging, gamin
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# Gets the instance of the logger.
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logSys = logging.getLogger("fail2ban.filter")
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##
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# Log reader class.
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#
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# This class reads a log file and detects login failures or anything else
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# that matches a given regular expression. This class is instanciated by
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# a Jail object.
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class FilterGamin(FileFilter):
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##
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# Constructor.
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#
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# Initialize the filter object with default values.
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# @param jail the jail object
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def __init__(self, jail):
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FileFilter.__init__(self, jail)
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self.__modified = False
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# Gamin monitor
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self.monitor = gamin.WatchMonitor()
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logSys.debug("Created FilterGamin")
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def callback(self, path, event):
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logSys.debug("Got event: " + `event` + " for " + path)
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if event in (gamin.GAMCreated, gamin.GAMChanged, gamin.GAMExists):
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logSys.debug("File changed: " + path)
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self.getFailures(path)
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self.__modified = True
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##
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# Add a log file path
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#
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# @param path log file path
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def addLogPath(self, path, tail = False):
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if self.containsLogPath(path):
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logSys.error(path + " already exists")
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else:
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self.monitor.watch_file(path, self.callback)
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FileFilter.addLogPath(self, path, tail)
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logSys.info("Added logfile = %s" % path)
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##
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# Delete a log path
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#
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# @param path the log file to delete
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def delLogPath(self, path):
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if not self.containsLogPath(path):
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logSys.error(path + " is not monitored")
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else:
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self.monitor.stop_watch(path)
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FileFilter.delLogPath(self, path)
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logSys.info("Removed logfile = %s" % path)
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##
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# Main loop.
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#
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# This function is the main loop of the thread. It checks if the
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# file has been modified and looks for failures.
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# @return True when the thread exits nicely
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def run(self):
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self.setActive(True)
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while self._isActive():
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if not self.getIdle():
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# We cannot block here because we want to be able to
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# exit.
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if self.monitor.event_pending():
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self.monitor.handle_events()
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if self.__modified:
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try:
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while True:
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ticket = self.failManager.toBan()
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self.jail.putFailTicket(ticket)
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except FailManagerEmpty:
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self.failManager.cleanup(MyTime.time())
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self.dateDetector.sortTemplate()
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self.__modified = False
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time.sleep(self.getSleepTime())
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else:
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time.sleep(self.getSleepTime())
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# Cleanup Gamin
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self.__cleanup()
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logSys.debug(self.jail.getName() + ": filter terminated")
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return True
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##
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# Desallocates the resources used by Gamin.
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def __cleanup(self):
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for path in self.getLogPath():
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self.monitor.stop_watch(path.getFileName())
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del self.monitor
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