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Current File : /usr/lib/python3/dist-packages/fail2ban/server/filterpoll.py
# 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
#

__author__ = "Cyril Jaquier, Yaroslav Halchenko"
__copyright__ = "Copyright (c) 2004 Cyril Jaquier; 2012 Yaroslav Halchenko"
__license__ = "GPL"

import os
import time

from .failmanager import FailManagerEmpty
from .filter import FileFilter
from .mytime import MyTime
from .utils import Utils
from ..helpers import getLogger, logging


# Gets the instance of the logger.
logSys = getLogger(__name__)


##
# 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 instantiated by
# a Jail object.

class FilterPoll(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
		## The time of the last modification of the file.
		self.__prevStats = dict()
		self.__file404Cnt = dict()
		logSys.debug("Created FilterPoll")

	##
	# Add a log file path
	#
	# @param path log file path

	def _addLogPath(self, path):
		self.__prevStats[path] = (0, None, None)	 # mtime, ino, size
		self.__file404Cnt[path] = 0

	##
	# Delete a log path
	#
	# @param path the log file to delete

	def _delLogPath(self, path):
		del self.__prevStats[path]
		del self.__file404Cnt[path]

	##
	# Get a modified log path at once
	#
	def getModified(self, modlst):
		for filename in self.getLogPaths():
			if self.isModified(filename):
				modlst.append(filename)
		return modlst

	##
	# 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):
		while self.active:
			try:
				if logSys.getEffectiveLevel() <= 4:
					logSys.log(4, "Woke up idle=%s with %d files monitored",
							   self.idle, self.getLogCount())
				if self.idle:
					if not Utils.wait_for(lambda: not self.active or not self.idle, 
						self.sleeptime * 10, self.sleeptime
					):
						self.ticks += 1
						continue
				# Get file modification
				modlst = []
				Utils.wait_for(lambda: not self.active or self.getModified(modlst),
					self.sleeptime)
				if not self.active: # pragma: no cover - timing
					break
				for filename in modlst:
					self.getFailures(filename)
					self.__modified = True

				self.ticks += 1
				if self.__modified:
					if not self.banASAP: # pragma: no cover
						self.performBan()
					self.__modified = False
			except Exception as e: # pragma: no cover
				if not self.active: # if not active - error by stop...
					break
				logSys.error("Caught unhandled exception in main cycle: %r", e,
					exc_info=logSys.getEffectiveLevel()<=logging.DEBUG)
				# incr common error counter:
				self.commonError()
		logSys.debug("[%s] filter terminated", self.jailName)
		return True

	##
	# Checks if the log file has been modified.
	#
	# Checks if the log file has been modified using os.stat().
	# @return True if log file has been modified

	def isModified(self, filename):
		try:
			logStats = os.stat(filename)
			stats = logStats.st_mtime, logStats.st_ino, logStats.st_size
			pstats = self.__prevStats.get(filename, (0,))
			if logSys.getEffectiveLevel() <= 4:
				# we do not want to waste time on strftime etc if not necessary
				dt = logStats.st_mtime - pstats[0]
				logSys.log(4, "Checking %s for being modified. Previous/current stats: %s / %s. dt: %s",
				           filename, pstats, stats, dt)
				# os.system("stat %s | grep Modify" % filename)
			self.__file404Cnt[filename] = 0
			if pstats == stats:
				return False
			logSys.debug("%s has been modified", filename)
			self.__prevStats[filename] = stats
			return True
		except Exception as e:
			# still alive (may be deleted because multi-threaded):
			if not self.getLog(filename) or self.__prevStats.get(filename) is None:
				logSys.warning("Log %r seems to be down: %s", filename, e)
				return False
			# log error:
			if self.__file404Cnt[filename] < 2:
				if e.errno == 2:
					logSys.debug("Log absence detected (possibly rotation) for %s, reason: %s",
							 filename, e)
				else: # pragma: no cover
					logSys.error("Unable to get stat on %s because of: %s",
							 filename, e, 
							 exc_info=logSys.getEffectiveLevel()<=logging.DEBUG)
			# increase file and common error counters:
			self.__file404Cnt[filename] += 1
			self.commonError()
			if self.__file404Cnt[filename] > 50:
				logSys.warning("Too many errors. Remove file %r from monitoring process", filename)
				self.__file404Cnt[filename] = 0
				self.delLogPath(filename)
			return False

	def getPendingPaths(self):
		return list(self.__file404Cnt.keys())

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