# 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 # # $Revision$ __author__ = "Cyril Jaquier" __version__ = "$Revision$" __date__ = "$Date$" __copyright__ = "Copyright (c) 2004 Cyril Jaquier" __license__ = "GPL" from failmanager import FailManagerEmpty from filter import FileFilter from mytime import MyTime import time, logging, gamin # Gets the instance of the logger. logSys = logging.getLogger("fail2ban.filter") ## # Log reader class. # # This class reads a log file and detects login failures or anything else # that matches a given regular expression. This class is instanciated by # a Jail object. class FilterGamin(FileFilter): ## # Constructor. # # Initialize the filter object with default values. # @param jail the jail object def __init__(self, jail): FileFilter.__init__(self, jail) self.__modified = False # Gamin monitor self.monitor = gamin.WatchMonitor() logSys.debug("Created FilterGamin") def callback(self, path, event): logSys.debug("Got event: " + `event` + " for " + path) if event in (gamin.GAMCreated, gamin.GAMChanged, gamin.GAMExists): logSys.debug("File changed: " + path) self.getFailures(path) self.__modified = True ## # Add a log file path # # @param path log file path def addLogPath(self, path, tail = False): if self.containsLogPath(path): logSys.error(path + " already exists") else: self.monitor.watch_file(path, self.callback) FileFilter.addLogPath(self, path, tail) logSys.info("Added logfile = %s" % path) ## # Delete a log path # # @param path the log file to delete def delLogPath(self, path): if not self.containsLogPath(path): logSys.error(path + " is not monitored") else: self.monitor.stop_watch(path) FileFilter.delLogPath(self, path) logSys.info("Removed logfile = %s" % path) ## # Main loop. # # This function is the main loop of the thread. It checks if the # file has been modified and looks for failures. # @return True when the thread exits nicely def run(self): self.setActive(True) while self._isActive(): if not self.getIdle(): # We cannot block here because we want to be able to # exit. if self.monitor.event_pending(): self.monitor.handle_events() if self.__modified: try: while True: ticket = self.failManager.toBan() self.jail.putFailTicket(ticket) except FailManagerEmpty: self.failManager.cleanup(MyTime.time()) self.dateDetector.sortTemplate() self.__modified = False time.sleep(self.getSleepTime()) else: time.sleep(self.getSleepTime()) # Cleanup Gamin self.__cleanup() logSys.debug(self.jail.getName() + ": filter terminated") return True ## # Desallocates the resources used by Gamin. def __cleanup(self): for path in self.getLogPath(): self.monitor.stop_watch(path.getFileName()) del self.monitor