[2] | 1 | #!/usr/bin/env python |
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| 2 | # |
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| 3 | # Author: Bas van der Vlies <basv@sara.nl> |
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| 4 | # Date : 16 February 2002 |
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| 5 | # |
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| 6 | # Tester: Walter de Jong <walter@sara.nl> |
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| 7 | # |
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[29] | 8 | # SVN info |
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| 9 | # $Id: pxeconfig 51 2004-12-13 15:23:50Z bas $ |
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[2] | 10 | # |
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[14] | 11 | # Copyright (C) 2002 |
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[6] | 12 | # |
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[14] | 13 | # This file is part of the pxeconfig utils |
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[6] | 14 | # |
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[14] | 15 | # This program is free software; you can redistribute it and/or modify it |
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| 16 | # under the terms of the GNU General Public License as published by the |
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| 17 | # Free Software Foundation; either version 2, or (at your option) any |
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| 18 | # later version. |
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[6] | 19 | # |
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[14] | 20 | # This program is distributed in the hope that it will be useful, |
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| 21 | # but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 22 | # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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| 23 | # GNU General Public License for more details. |
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[6] | 24 | # |
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[14] | 25 | # You should have received a copy of the GNU General Public License |
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| 26 | # along with this program; if not, write to the Free Software |
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| 27 | # Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA |
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| 28 | # |
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[2] | 29 | """ |
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[19] | 30 | Usage: pxeconfig |
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[49] | 31 | |
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[19] | 32 | [-d|--directory <pxe_config_dir>] |
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[24] | 33 | [-V|--version] |
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[19] | 34 | [-n|--net <C-net> -s|--start <number> -e|--end <number> -f|--file <filename>] |
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[49] | 35 | [-f|--file <filename>] [hostname(s)] |
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[10] | 36 | |
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[19] | 37 | With this program you can configure which PXE configuration file a node |
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| 38 | will use when it boots. The program can be started interactivly or via |
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| 39 | command line options. |
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| 40 | |
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| 41 | When this program is started interactive it will ask the following questions: |
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[2] | 42 | 1) Network address (Class C-network address only) |
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[9] | 43 | 2) Starting number |
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[2] | 44 | 3) Ending number |
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[9] | 45 | 4) Which PXE config file to use |
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[2] | 46 | |
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| 47 | For example, if the answers are: |
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| 48 | 1) 10.168.44 |
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| 49 | 2) 2 |
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| 50 | 3) 4 |
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| 51 | 4) default.node_install |
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| 52 | |
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| 53 | Then the result is that is create symbolic links in /tftpboot/pxelinux.cfg: |
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| 54 | 0AA82C02 ----> default.node_install |
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| 55 | 0AA82C03 ----> default.node_install |
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| 56 | 0AA82C04 ----> default.node_install |
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| 57 | """ |
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| 58 | |
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| 59 | import string |
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| 60 | import sys |
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| 61 | import os |
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| 62 | import glob |
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[3] | 63 | import getopt |
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[47] | 64 | import socket |
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[2] | 65 | |
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| 66 | # DEBUG |
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| 67 | # |
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| 68 | DEBUG=0 |
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| 69 | |
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| 70 | # Constants |
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| 71 | # |
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[4] | 72 | PXE_CONF_DIR='/tftpboot/pxelinux.cfg' |
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[19] | 73 | NETWORK='network' |
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| 74 | FILENAME='filename' |
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| 75 | START='start' |
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| 76 | END='end' |
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[47] | 77 | VERSION='0.5' |
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[2] | 78 | |
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[24] | 79 | SHORTOPT_LIST='hVd:n:s:e:f:' |
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[23] | 80 | LONGOPT_LIST=['help', 'version', 'directory=', 'net=', 'start=', 'end=', 'file='] |
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[19] | 81 | |
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| 82 | def select_pxe_configfile(): |
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[2] | 83 | """ |
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[9] | 84 | Let user choose which pxeconfig file to use. |
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[2] | 85 | """ |
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| 86 | |
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[4] | 87 | os.chdir(PXE_CONF_DIR) |
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[2] | 88 | |
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[9] | 89 | # Try to determine to which file the default symlink points, and |
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| 90 | # if it exists, remove it from the list. |
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[2] | 91 | # |
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| 92 | try: |
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| 93 | default_file = os.readlink('default') |
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| 94 | except OSError: |
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| 95 | default_file = None |
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| 96 | pass |
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| 97 | |
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| 98 | files = glob.glob('default.*') |
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| 99 | if not files: |
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| 100 | print 'There are no pxe config files starting with: default.' |
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| 101 | sys.exit(1) |
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| 102 | |
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| 103 | if default_file: |
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| 104 | files.remove(default_file) |
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| 105 | |
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| 106 | |
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| 107 | print 'Which pxe config file must we use: ?' |
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| 108 | i = 1 |
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| 109 | for file in files: |
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| 110 | print "%d : %s" %(i,file) |
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| 111 | i = i +1 |
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| 112 | |
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| 113 | while 1: |
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[16] | 114 | index = raw_input('Select a number: ') |
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[2] | 115 | try: |
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| 116 | index = int(index) |
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| 117 | except ValueError: |
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| 118 | index = len(files) + 1 |
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| 119 | |
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| 120 | # Is the user smart enough to select |
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[9] | 121 | # the right value?? |
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[2] | 122 | # |
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| 123 | if 0 < index <= len(files): break |
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| 124 | |
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| 125 | return files[index-1] |
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| 126 | |
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[19] | 127 | def create_links(dict): |
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[2] | 128 | """ |
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[4] | 129 | Create the links in the PXE_CONF_DIR, |
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[9] | 130 | list : A list containing: network hex address, pxe config file, |
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[2] | 131 | start number, end number |
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| 132 | """ |
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[4] | 133 | os.chdir(PXE_CONF_DIR) |
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[19] | 134 | naddr = dict[NETWORK] |
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| 135 | pxe_filename = dict[FILENAME] |
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| 136 | for i in range(dict[START], dict[END]+1): |
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[2] | 137 | haddr = '%s%02X' %(naddr, i) |
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| 138 | if DEBUG: |
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| 139 | print 'linking %s to %s' %(haddr, pxe_filename) |
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[15] | 140 | |
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| 141 | if os.path.exists(haddr): |
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| 142 | os.unlink(haddr) |
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| 143 | |
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[2] | 144 | os.symlink(pxe_filename, haddr) |
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| 145 | |
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| 146 | |
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[47] | 147 | def convert_network(net, prefix=''): |
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[2] | 148 | """ |
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[9] | 149 | This function checks if the give network is a Class C-network and will |
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[2] | 150 | convert the network address to a hex address if true. |
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| 151 | """ |
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| 152 | d = string.split(net, '.') |
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| 153 | |
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| 154 | if len(d) != 3: |
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[19] | 155 | if prefix: |
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| 156 | net = prefix + ' : ' + net |
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| 157 | |
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| 158 | print '%s is not a valid C-class network address!!!' %net |
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[2] | 159 | sys.exit(1) |
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| 160 | |
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[19] | 161 | |
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| 162 | # Display right message for interactive/commandline |
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| 163 | if prefix: |
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| 164 | prefix = prefix + ' ' + net |
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| 165 | else: |
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| 166 | prefix = net |
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| 167 | |
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[2] | 168 | # Check if we have valid network values |
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| 169 | r = '' |
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| 170 | for i in d: |
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[19] | 171 | i = check_number(i, prefix) |
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[2] | 172 | r = '%s%02X' %(r,i) |
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| 173 | |
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| 174 | if DEBUG: |
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| 175 | print r |
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| 176 | |
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| 177 | return r |
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| 178 | |
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[19] | 179 | def check_number(number, prefix=''): |
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[2] | 180 | """ |
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| 181 | This functions checks if the input is between 0 < number < 255: |
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| 182 | number : is a string |
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[19] | 183 | prefix ; a string that must be displayed if an error occurs |
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[2] | 184 | """ |
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| 185 | try: |
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| 186 | n = int(number) |
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| 187 | except ValueError, detail: |
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[19] | 188 | print prefix,detail |
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[2] | 189 | sys.exit(1) |
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| 190 | |
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| 191 | if 0 <= n <= 255: |
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| 192 | return n |
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| 193 | else: |
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[19] | 194 | |
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| 195 | if prefix: |
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| 196 | number = prefix +' : ' + number |
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| 197 | |
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[2] | 198 | print '%s is not a valid number, must be between 0 and 255' %number |
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| 199 | sys.exit(1) |
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| 200 | |
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[19] | 201 | def interactive(binfo): |
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[2] | 202 | |
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| 203 | print __doc__ |
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| 204 | |
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[9] | 205 | network = raw_input('Give network address (xxx.xxx.xxx): ') |
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[47] | 206 | naddr = convert_network(network) |
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[2] | 207 | |
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| 208 | start = raw_input('Starting number: ') |
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| 209 | start = check_number(start) |
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| 210 | |
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| 211 | end = raw_input('Ending number: ') |
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| 212 | end = check_number(end) |
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| 213 | |
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[19] | 214 | pxe_filename = select_pxe_configfile() |
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[2] | 215 | |
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[19] | 216 | binfo[NETWORK] = naddr |
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| 217 | binfo[START] = int(start) |
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| 218 | binfo[END] = int(end) |
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| 219 | binfo[FILENAME] = pxe_filename |
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[2] | 220 | |
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[19] | 221 | if DEBUG: |
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| 222 | print network, binfo |
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[2] | 223 | |
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[19] | 224 | def check_cmd_line(binfo): |
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| 225 | if len(binfo.keys()) != 4: |
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| 226 | print __doc__ |
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[20] | 227 | print 'Not enough arguments to create the links!!' |
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[19] | 228 | sys.exit(1) |
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[6] | 229 | |
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[19] | 230 | # check_filename |
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| 231 | # |
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| 232 | if not os.path.isfile(os.path.join(PXE_CONF_DIR, binfo[FILENAME])): |
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| 233 | print '%s: Filename does not exists' %binfo[FILENAME] |
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| 234 | sys.exit(1) |
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| 235 | |
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| 236 | def check_args(argv, binfo): |
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[3] | 237 | """ |
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[47] | 238 | This function parses the command line options and returns the rest as |
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| 239 | an list of hostnames: |
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| 240 | argv : a list of command line options. |
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| 241 | binfo : returning a dict with the netinfo. if used non-interactively |
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| 242 | hostnames: the rest of the command lines options that are not-parseble. |
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[3] | 243 | """ |
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[4] | 244 | global PXE_CONF_DIR |
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[19] | 245 | |
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[3] | 246 | try: |
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| 247 | opts, args = getopt.getopt(argv[1:], SHORTOPT_LIST, LONGOPT_LIST) |
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| 248 | except getopt.error, detail: |
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[20] | 249 | print __doc__ |
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[3] | 250 | print detail |
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| 251 | sys.exit(1) |
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| 252 | |
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[19] | 253 | # Check given options |
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| 254 | # |
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| 255 | for opt,value in opts: |
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| 256 | if opt in ['-d', '--directory']: |
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| 257 | if os.path.isdir(value): |
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| 258 | PXE_CONF_DIR = value |
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| 259 | else: |
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| 260 | print 'Directory %s does not exists\n' %value |
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| 261 | sys.exit(1) |
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[3] | 262 | |
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[19] | 263 | elif opt in ['-n', '--net']: |
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| 264 | network = value |
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[47] | 265 | binfo[NETWORK] = convert_network(value, opt) |
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[4] | 266 | |
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[19] | 267 | elif opt in ['-s', '--start']: |
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| 268 | binfo[START] = check_number(value, opt) |
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| 269 | |
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| 270 | elif opt in ['-e', '--end']: |
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| 271 | binfo[END] = check_number(value, opt) |
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| 272 | |
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| 273 | elif opt in ['-f', '--file']: |
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| 274 | binfo[FILENAME] = value |
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| 275 | |
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[24] | 276 | elif opt in ['-V', '--version']: |
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[23] | 277 | print VERSION |
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| 278 | sys.exit(0) |
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| 279 | |
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[20] | 280 | elif opt in ['-h', '--help']: |
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| 281 | print __doc__ |
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| 282 | sys.exit(0) |
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[19] | 283 | |
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[51] | 284 | if args: |
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| 285 | return args |
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[20] | 286 | |
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[47] | 287 | def hosts_links(hosts, binfo): |
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| 288 | for host in hosts: |
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| 289 | try: |
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| 290 | addr = socket.gethostbyname(host) |
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| 291 | except socket.error,detail: |
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| 292 | print '%s not an valid hostname: %s' %(host,detail) |
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| 293 | sys.exit(1) |
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| 294 | |
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| 295 | net = string.splitfields(addr, '.') |
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| 296 | cnet = string.joinfields(net[0:3], '.') |
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| 297 | |
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| 298 | binfo[NETWORK] = convert_network(cnet) |
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| 299 | binfo[START] = int(net[3]) |
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| 300 | binfo[END] = int(net[3]) |
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| 301 | create_links(binfo) |
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| 302 | |
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| 303 | |
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[2] | 304 | def main(): |
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[19] | 305 | # A dictionary holding the boot info |
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| 306 | # |
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| 307 | bootinfo = {} |
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[2] | 308 | |
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[47] | 309 | hostnames = check_args(sys.argv, bootinfo) |
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| 310 | |
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| 311 | |
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| 312 | # If we supplied args then make links for the supplied hosts |
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| 313 | # else make links for class C-networks |
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| 314 | # |
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| 315 | if hostnames: |
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| 316 | if not bootinfo.has_key(FILENAME): |
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| 317 | bootinfo[FILENAME] = select_pxe_configfile() |
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| 318 | hosts_links(hostnames,bootinfo) |
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[19] | 319 | else: |
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[47] | 320 | if bootinfo: |
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| 321 | check_cmd_line(bootinfo) |
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| 322 | else: |
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| 323 | interactive(bootinfo) |
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| 324 | create_links(bootinfo) |
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[19] | 325 | |
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[2] | 326 | if __name__ == '__main__': |
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| 327 | main() |
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