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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: 443 $
__author__ = "Cyril Jaquier"
__version__ = "$Revision: 443 $"
__date__ = "$Date: 2006-11-01 00:36:59 +0100 (Wed, 01 Nov 2006) $"
__copyright__ = "Copyright (c) 2004 Cyril Jaquier"
__license__ = "GPL"
from threading import Thread
# cPickle generates an exception with Python 2.5
#from cPickle import dumps, loads, HIGHEST_PROTOCOL
from pickle import dumps, loads, HIGHEST_PROTOCOL
import socket, logging, os, os.path
# Gets the instance of the logger.
logSys = logging.getLogger("fail2ban.comm")
class SSocket(Thread):
END_STRING = "<F2B_END_COMMAND>"
def __init__(self, transmitter):
Thread.__init__(self)
self.__transmit = transmitter
self.__isRunning = False
self.__socket = "/tmp/fail2ban.sock"
self.__ssock = None
logSys.debug("Created SSocket")
def initialize(self, sock = "/tmp/fail2ban.sock", force = False):
self.__socket = sock
# Remove socket
if os.path.exists(sock):
logSys.error("Fail2ban seems to be already running")
if force:
logSys.warn("Forcing execution of the server")
os.remove(sock)
else:
raise SSocketErrorException("Server already running")
# Create an INET, STREAMing socket
#self.__ssock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
self.__ssock = socket.socket(socket.AF_UNIX, socket.SOCK_STREAM)
#self.__ssock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
#self.__ssock.setblocking(False)
# Do not use a blocking socket as there is problem at shutdown.
# Use a timeout instead. Daemon exits at most 'timeout' seconds
# after the command.
self.__ssock.settimeout(1)
# Bind the socket to a public host and a well-known port
#self.__ssock.bind(("localhost", 2222))
self.__ssock.bind(sock)
# Become a server socket
self.__ssock.listen(5)
def run(self):
self.__isRunning = True
while self.__isRunning:
try:
(csock, address) = self.__ssock.accept()
thread = SocketWorker(csock, self.__transmit)
thread.start()
except socket.timeout:
# Do nothing here
pass
self.__ssock.close()
# Remove socket
if os.path.exists(self.__socket):
logSys.debug("Removed socket file " + self.__socket)
os.remove(self.__socket)
logSys.debug("Socket shutdown")
return True
##
# Stop the thread.
#
# Set the isRunning flag to False.
# @bug It seems to be some concurrency problem with this flag
def stop(self):
self.__isRunning = False
class SocketWorker(Thread):
def __init__(self, csock, transmitter):
Thread.__init__(self)
self.__csock = csock
self.__transmit = transmitter
def run(self):
logSys.debug("Starting new thread to handle the request")
msg = self.__receive(self.__csock)
msg = self.__transmit.proceed(msg)
self.__send(self.__csock, msg)
self.__csock.close()
logSys.debug("Connection closed")
@staticmethod
def __send(sock, msg):
obj = dumps(msg, HIGHEST_PROTOCOL)
sock.send(obj + SSocket.END_STRING)
@staticmethod
def __receive(sock):
msg = ''
while msg.rfind(SSocket.END_STRING) == -1:
chunk = sock.recv(6)
if chunk == '':
raise RuntimeError, "socket connection broken"
msg = msg + chunk
return loads(msg)
class SSocketErrorException(Exception):
pass
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