source: trunk/src/pxeconfigd.py @ 171

# Copyright (C) 2002
#
# This file is part of the pxeconfig utils
#
# This program 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, or (at your option) any
# later version.
#
# This program 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 this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA
#
# SVN info
#  $Id: pxeconfigd.py 171 2009-08-19 08:53:16Z bas $
"""
Author: Bas van der Vlies <basv@sara.nl>
Date  : 12 February 2002
Desc. : This script is used to control how a node is booted with PXE
        enabled network cards. The node boots and fetch a pxe
        config file which tells how the node must boot. This daemon
        enables a client to remove his/here pxe config file. With the
        next boot it will use the default one.

        command line option:
          -V/--version 
            Prints the version number and exits
          
        Note:
          This server can ONLY be started from inetd.
"""
import time
import socket
import sys
import os
import string
import syslog
import getopt

# PXE modules
from pxe_global import *

# DEBUG
#
DEBUG=1

# Some Global Constants
#
BUFSIZE=4096
STDIN=0
STDOUT=1
SHORTOPT_LIST='V'
LONGOPT_LIST=['version']

PXE_CONF_DIR = '/tftpboot/pxelinux.cfg'
VERSION = '3.0.0'

# Give the current time
#
def now():
    return time.ctime(time.time())


def remove_link(filename):
  """This removes the pxe config filename for the host that is connected:
      filename : string
  """

  file = os.path.join(PXE_CONF_DIR, filename)

  if DEBUG:
    print 'file = %s' %file

  if not os.path.exists(file): return

  if os.path.islink(file): 
    try:
      os.unlink(file)
      syslog.openlog("pxeconfigd")
      syslog.syslog(syslog.LOG_INFO, file)
      syslog.closelog()
    except OSError:
      err_msg = "No permission at directory: %s" %PXE_CONF_DIR
      os.write(STDOUT, err_msg)
      sys.exit(1)

# This function handles the client connection. It closes
# the connection if there is no data
#
def handleConnection(settings):
        """
        Determines which host connects to the server
        """ 
        
        # Determine client address
        # 
        try:
                client_addr = socket.fromfd(sys.stdin.fileno(), socket.AF_INET, 
                          socket.SOCK_STREAM)
                client_ip = client_addr.getpeername()[0] 
        except socket.error, detail:
                error =  "pxeconfigd can only be started from inetd!!!"
                raise PxeConfig, error 
                
        # translate ip address ---> hex address
        #
        d = string.split(client_ip, '.')
        client_haddr = '%02X%02X%02X%02X' %(int(d[0]), int(d[1]), int(d[2]), int(d[3])) 
        
        if DEBUG:
                print 'ip = %s, hex = %s' %(client_ip, client_haddr) 

        if settings['daemon_script_hook']:
                cmd = '%s %s' %(settings['daemon_script_hook'], client_ip)
                print cmd
                os.system(cmd)

        remove_link(client_haddr)
        sys.exit(0)

def check_args(argv, settings):
        """
        Must we use another directory for the PXE configuration
        """
        global PXE_CONF_DIR 
        
        try:
                opts, args = getopt.getopt(argv[1:], SHORTOPT_LIST, LONGOPT_LIST)
        except getopt.error, detail:
                print __doc__
                print detail
                sys.exit(1) 
                
        for opt, value in opts:
                if opt in ['-V', '--version']:
                        print VERSION
                        sys.exit(0)

        try:
                PXE_CONF_DIR = settings['pxe_config_dir']
        except KeyError:
                pass 
                
        PXE_CONF_DIR = os.path.realpath(PXE_CONF_DIR) 
        if not os.path.isdir(PXE_CONF_DIR):
                error =  'pxeconfig directory: %s does not exists' %(PXE_CONF_DIR)
                raise PxeConfig, error

def server():
  """Start the daemon
  """
  config = ReadConfig()
  check_args(sys.argv, config)
  handleConnection(config)

if __name__ == '__main__':
  server()