source: trunk/pxeconfig/pxeconfigd @ 6

Last change on this file since 6 was 6, checked in by sscpbas, 20 years ago

Added the license info to each utility and fix and error in the getopt
handling for pxeconfig utility

File size: 3.4 KB
Line 
1#!/usr/bin/env python
2# Copyright (C) 2000, SARA.
3#
4# Permission to use, copy, modify, and distribute this software and its
5# documentation for non-commercial purposes and without fee is hereby
6# granted, provided that the above copyright notice appears in all copies
7# and that both the copyright notice and this permission notice appear in
8# supporting documentation.
9#
10# Neither SARA (Stichting Academisch Rekencentrum Amsterdam) nor the
11# nor the author make any representations about the suitability of this
12# software for any purpose. This software is provided ``as is'' without
13# express or implied warranty.
14#
15#
16"""
17Author: Bas van der Vlies <basv@sara.nl>
18Date  : 12 February 2002
19Desc. : This script is used to control how a node is booted with PXE
20        enabled network cards. The node boots and fetch a pxe
21        config file which tells how the node must boot. This daemon
22        enables a client to remove his/here pxe config file. With the
23        next boot it will use the default one.
24
25        command line option:
26          -d/--directory <dir>
27            Where <dir> is the directory where the pxe config files reside.
28         
29        Note:
30          This server can ONLY be started from inetd.
31
32CVS info
33  $Date: 2002/02/21 13:21:52 $
34  $Revision: 1.4 $
35"""
36import time
37import socket
38import sys
39import os
40import string
41import syslog
42import getopt
43
44# DEBUG
45#
46DEBUG=1
47
48# Some Global Constants
49#
50BUFSIZE=4096
51STDIN=0
52STDOUT=1
53SHORTOPT_LIST='d:'
54LONGOPT_LIST=['directory=']
55
56PXE_CONF_DIR = '/tftpboot/pxelinux.cfg'
57
58# Give the current time
59#
60def now():
61    return time.ctime(time.time())
62
63
64def remove_link(filename):
65  """This removes the pxe config filename for the host that is connected:
66      filename : string
67  """
68
69  file = os.path.join(PXE_CONF_DIR, filename)
70
71  if DEBUG:
72    print 'file = %s' %file
73
74  if not os.path.exists(file): return
75
76  if os.path.islink(file): 
77    try:
78      os.unlink(file)
79      syslog.openlog("pxeconfigd")
80      syslog.syslog(syslog.LOG_INFO, file)
81      syslog.closelog()
82    except OSError:
83      err_msg = "No permission at directory: %s" %PXE_CONF_DIR
84      os.write(STDOUT, err_msg)
85      sys.exit(1)
86
87# This function handles the client connection. It closes
88# the connection if there is no data
89#
90def handleConnection():
91  """Determines which host connects to the server
92  """
93
94  # Determine client address
95  #
96  try:
97    client_addr = socket.fromfd(sys.stdin.fileno(), socket.AF_INET, 
98                          socket.SOCK_STREAM)
99    client_ip = client_addr.getpeername()[0] 
100
101  except socket.error, detail:
102    print "pxeconfigd can only be started from inetd!!!"
103    sys.exit(1)
104
105
106  # translate ip address ---> hex address
107  #
108  d = string.split(client_ip, '.')
109  client_haddr = '%02X%02X%02X%02X' %(int(d[0]), int(d[1]), int(d[2]), int(d[3]))
110
111  if DEBUG:
112    print 'ip = %s, hex = %s' %(client_ip, client_haddr)
113
114  remove_link(client_haddr)
115  sys.exit(0)
116
117def check_args(argv):
118  """
119  Must we use another directory for the PXE configuration
120  """
121  global PXE_CONF_DIR
122
123  try:
124    opts, args = getopt.getopt(argv[1:], SHORTOPT_LIST, LONGOPT_LIST)
125  except getopt.error, detail:
126    print __doc__
127    print detail
128    sys.exit(1)
129
130  if opts:
131    opt, PXE_CONF_DIR = opts[0]
132
133def server():
134  """Start the daemon
135  """
136  check_args(sys.argv)
137
138  if not os.path.isdir(PXE_CONF_DIR):
139    os.write(STDOUT, "PXE booting is not configured")
140    sys.exit(1)
141
142  handleConnection()
143
144if __name__ == '__main__':
145  server()
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