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