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134 lines
3.5 KiB
134 lines
3.5 KiB
# 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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# Author: Cyril Jaquier, Yaroslav Halchenko
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__author__ = "Cyril Jaquier, Yaroslav Halchenko"
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__copyright__ = "Copyright (c) 2004 Cyril Jaquier, 2012 Yaroslav Halchenko"
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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, fcntl
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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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fd = self.monitor.get_fd()
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flags = fcntl.fcntl(fd, fcntl.F_GETFD)
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fcntl.fcntl(fd, fcntl.F_SETFD, flags|fcntl.FD_CLOEXEC)
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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.__modified = True
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self._process_file(path)
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def _process_file(self, path):
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"""Process a given file
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TODO -- RF:
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this is a common logic and must be shared/provided by FileFilter
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"""
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self.getFailures(path)
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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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##
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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):
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self.monitor.watch_file(path, self.callback)
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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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self.monitor.stop_watch(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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# Gamin needs a loop to collect and dispatch events
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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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time.sleep(self.getSleepTime())
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logSys.debug(self.jail.getName() + ": filter terminated")
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return True
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def stop(self):
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super(FilterGamin, self).stop()
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self.__cleanup()
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##
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# Free up 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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