fail2ban/fail2ban-server

#!/usr/bin/python
# 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"
__copyright__ = "Copyright (c) 2004 Cyril Jaquier"
__license__ = "GPL"

import getopt, sys, logging, os

# Inserts our own modules path first in the list
# fix for bug #343821
try:
	from common.version import version
except ImportError, e:
	sys.path.insert(1, "/usr/share/fail2ban")
	from common.version import version

from server.server import Server

# Gets the instance of the logger.
logSys = logging.getLogger("fail2ban")

##
# \mainpage Fail2Ban
#
# \section Introduction
#
# Fail2ban is designed to protect your server against brute force attacks.
# Its first goal was to protect a SSH server.

class Fail2banServer:
	
	def __init__(self):
		self.__server = None
		self.__argv = None
		self.__conf = dict()
		self.__conf["background"] = True
		self.__conf["force"] = False
		self.__conf["socket"] = "/var/run/fail2ban/fail2ban.sock"
		self.__conf["pidfile"] = "/var/run/fail2ban/fail2ban.pid"
	
	def dispVersion(self):
		print "Fail2Ban v" + version
		print
		print "Copyright (c) 2004-2008 Cyril Jaquier, 2008- Fail2Ban Contributors"
		print "Copyright of modifications held by their respective authors."
		print "Licensed under the GNU General Public License v2 (GPL)."
		print
		print "Written by Cyril Jaquier <cyril.jaquier@fail2ban.org>."
		print "Many contributions by Yaroslav O. Halchenko <debian@onerussian.com>."
	
	def dispUsage(self):
		""" Prints Fail2Ban command line options and exits
		"""
		print "Usage: "+self.__argv[0]+" [OPTIONS]"
		print
		print "Fail2Ban v" + version + " reads log file that contains password failure report"
		print "and bans the corresponding IP addresses using firewall rules."
		print
		print "Only use this command for debugging purpose. Start the server with"
		print "fail2ban-client instead. The default behaviour is to start the server"
		print "in background."
		print
		print "Options:"
		print "    -b                   start in background"
		print "    -f                   start in foreground"
		print "    -s <FILE>            socket path"
		print "    -p <FILE>            pidfile path"
		print "    -x                   force execution of the server (remove socket file)"
		print "    -h, --help           display this help message"
		print "    -V, --version        print the version"
		print
		print "Report bugs to https://github.com/fail2ban/fail2ban/issues"
	
	def __getCmdLineOptions(self, optList):
		""" Gets the command line options
		"""
		for opt in optList:
			if opt[0] == "-b":
				self.__conf["background"] = True
			if opt[0] == "-f":
				self.__conf["background"] = False
			if opt[0] == "-s":
				self.__conf["socket"] = opt[1]
			if opt[0] == "-p":
				self.__conf["pidfile"] = opt[1]
			if opt[0] == "-x":
				self.__conf["force"] = True
			if opt[0] in ["-h", "--help"]:
	 			self.dispUsage()
				sys.exit(0)
			if opt[0] in ["-V", "--version"]:
	 			self.dispVersion()
				sys.exit(0)
		
	def start(self, argv):
		# Command line options
		self.__argv = argv
		
		# Reads the command line options.
		try:
			cmdOpts = 'bfs:p:xhV'
			cmdLongOpts = ['help', 'version']
			optList, args = getopt.getopt(self.__argv[1:], cmdOpts, cmdLongOpts)
		except getopt.GetoptError:
			self.dispUsage()
			sys.exit(-1)
			
		self.__getCmdLineOptions(optList)
		
		try:
			self.__server = Server(self.__conf["background"])
			self.__server.start(self.__conf["socket"],
								self.__conf["pidfile"],
								self.__conf["force"])
			return True
		except Exception, e:
			logSys.exception(e)
			self.__server.quit()
			return False
		
if __name__ == "__main__":
	server = Fail2banServer()
	if server.start(sys.argv):
		sys.exit(0)
	else:
		sys.exit(-1)