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# 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
# Author: Cyril Jaquier
#
# $Revision: 696 $
__author__ = "Cyril Jaquier"
__version__ = "$Revision: 696 $"
__date__ = "$Date: 2008-05-19 23:05:32 +0200 (Mon, 19 May 2008) $"
__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
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