#!/usr/bin/env python # $Id$ # pyftpdlib is released under the MIT license, reproduced below: # ====================================================================== # Copyright (C) 2007-2012 Giampaolo Rodola' # # All Rights Reserved # # Permission is hereby granted, free of charge, to any person # obtaining a copy of this software and associated documentation # files (the "Software"), to deal in the Software without # restriction, including without limitation the rights to use, # copy, modify, merge, publish, distribute, sublicense, and/or sell # copies of the Software, and to permit persons to whom the # Software is furnished to do so, subject to the following # conditions: # # The above copyright notice and this permission notice shall be # included in all copies or substantial portions of the Software. # # THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, # EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES # OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND # NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT # HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, # WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING # FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR # OTHER DEALINGS IN THE SOFTWARE. # # ====================================================================== """A basic unix daemon using the python-daemon library: http://pypi.python.org/pypi/python-daemon Example usages: $ python unix_daemon.py start $ python unix_daemon.py stop $ python unix_daemon.py status $ python unix_daemon.py # foreground (no daemon) $ python unix_daemon.py --logfile /var/log/ftpd.log start $ python unix_daemon.py --pidfile /var/run/ftpd.pid start This is just a proof of concept which demonstrates how to daemonize the FTP server. You might want to use this as an example and provide the necessary customizations. Parts you might want to customize are: - UMASK, WORKDIR, HOST, PORT constants - get_server() function (to define users and customize FTP handler) Authors: - Ben Timby - btimby gmail.com - Giampaolo Rodola' - g.rodola gmail.com """ from __future__ import with_statement import os import errno import sys import time import optparse import signal from pyftpdlib import ftpserver from pyftpdlib.contrib.authorizers import UnixAuthorizer # http://pypi.python.org/pypi/python-daemon import daemon import daemon.pidfile # overridable options HOST = "" PORT = 21 PID_FILE = "/var/run/pyftpdlib.pid" LOG_FILE = "/var/log/pyftpdlib.log" WORKDIR = os.getcwd() UMASK = 0 def pid_exists(pid): """Return True if a process with the given PID is currently running.""" try: os.kill(pid, 0) except OSError, e: return e.errno == errno.EPERM else: return True def get_pid(): """Return the PID saved in the pid file if possible, else None.""" try: with open(PID_FILE) as f: return int(f.read().strip()) except IOError, err: if err.errno != errno.ENOENT: raise def stop(): """Keep attempting to stop the daemon for 5 seconds, first using SIGTERM, then using SIGKILL. """ pid = get_pid() if not pid or not pid_exists(pid): print "daemon not running" return sig = signal.SIGTERM i = 0 while True: sys.stdout.write('.') sys.stdout.flush() try: os.kill(pid, sig) except OSError, e: if e.errno == errno.ESRCH: print "\nstopped (pid %s)" % pid return else: raise i += 1 if i == 25: sig = signal.SIGKILL elif i == 50: sys.exit("\ncould not kill daemon (pid %s)" % pid) time.sleep(0.1) def status(): """Print daemon status and exit.""" pid = get_pid() if not pid or not pid_exists(pid): print "daemon not running" else: print "daemon running with pid %s" % pid sys.exit(0) def get_server(): """Return a pre-configured FTP server instance.""" # when daemonized, it seems we need to flush() stdout explicitly # in order to get the log file written in real time def log(s): sys.stdout.write(s + "\n") sys.stdout.flush() ftpserver.log = ftpserver.logline = log ftp_handler = ftpserver.FTPHandler ftp_handler.authorizer = UnixAuthorizer() server = ftpserver.FTPServer((HOST, PORT), ftp_handler) return server def daemonize(): """A wrapper around python-daemonize context manager.""" pid = get_pid() if pid and pid_exists(pid): sys.exit('daemon already running (pid %s)' % pid) # instance FTPd before daemonizing, so that in case of problems we # get an exception here and exit immediately server = get_server() logfile = open(LOG_FILE, 'a+') ctx = daemon.DaemonContext( stdout=logfile, stderr=logfile, working_directory=WORKDIR, umask=UMASK, pidfile=daemon.pidfile.TimeoutPIDLockFile(PID_FILE), files_preserve=[server], ) with ctx: server.serve_forever() def main(): global PID_FILE, LOG_FILE USAGE = "python [-p PIDFILE] [-l LOGFILE]\n\n" \ "Commands:\n - start\n - stop\n - status" parser = optparse.OptionParser(usage=USAGE) parser.add_option('-l', '--logfile', dest='logfile', help='the log file location') parser.add_option('-p', '--pidfile', dest='pidfile', default=PID_FILE, help='file to store/retreive daemon pid') options, args = parser.parse_args() if options.pidfile: PID_FILE = options.pidfile if options.logfile: LOG_FILE = options.logfile if not args: server = get_server() server.serve_forever() else: if len(args) != 1: sys.exit('too many commands') elif args[0] == 'start': daemonize() elif args[0] == 'stop': stop() elif args[0] == 'status': status() else: sys.exit('invalid command') if __name__ == '__main__': sys.exit(main())