1 | #!/usr/bin/env python |
---|
2 | # |
---|
3 | # Author: Bas van der Vlies <basv@sara.nl> |
---|
4 | # Date : 16 February 2002 |
---|
5 | # |
---|
6 | # Tester: Walter de Jong <walter@sara.nl> |
---|
7 | # |
---|
8 | # SVN info |
---|
9 | # $Id: pxeconfig 45 2004-09-03 11:40:04Z bas $ |
---|
10 | # |
---|
11 | # Copyright (C) 2002 |
---|
12 | # |
---|
13 | # This file is part of the pxeconfig utils |
---|
14 | # |
---|
15 | # This program is free software; you can redistribute it and/or modify it |
---|
16 | # under the terms of the GNU General Public License as published by the |
---|
17 | # Free Software Foundation; either version 2, or (at your option) any |
---|
18 | # later version. |
---|
19 | # |
---|
20 | # This program is distributed in the hope that it will be useful, |
---|
21 | # but WITHOUT ANY WARRANTY; without even the implied warranty of |
---|
22 | # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
---|
23 | # GNU General Public License for more details. |
---|
24 | # |
---|
25 | # You should have received a copy of the GNU General Public License |
---|
26 | # along with this program; if not, write to the Free Software |
---|
27 | # Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA |
---|
28 | # |
---|
29 | """ |
---|
30 | Usage: pxeconfig |
---|
31 | [-d|--directory <pxe_config_dir>] |
---|
32 | [-V|--version] |
---|
33 | [-n|--net <C-net> -s|--start <number> -e|--end <number> -f|--file <filename>] |
---|
34 | |
---|
35 | With this program you can configure which PXE configuration file a node |
---|
36 | will use when it boots. The program can be started interactivly or via |
---|
37 | command line options. |
---|
38 | |
---|
39 | When this program is started interactive it will ask the following questions: |
---|
40 | 1) Network address (Class C-network address only) |
---|
41 | 2) Starting number |
---|
42 | 3) Ending number |
---|
43 | 4) Which PXE config file to use |
---|
44 | |
---|
45 | For example, if the answers are: |
---|
46 | 1) 10.168.44 |
---|
47 | 2) 2 |
---|
48 | 3) 4 |
---|
49 | 4) default.node_install |
---|
50 | |
---|
51 | Then the result is that is create symbolic links in /tftpboot/pxelinux.cfg: |
---|
52 | 0AA82C02 ----> default.node_install |
---|
53 | 0AA82C03 ----> default.node_install |
---|
54 | 0AA82C04 ----> default.node_install |
---|
55 | """ |
---|
56 | |
---|
57 | import string |
---|
58 | import sys |
---|
59 | import os |
---|
60 | import glob |
---|
61 | import getopt |
---|
62 | |
---|
63 | # DEBUG |
---|
64 | # |
---|
65 | DEBUG=0 |
---|
66 | |
---|
67 | # Constants |
---|
68 | # |
---|
69 | PXE_CONF_DIR='/tftpboot/pxelinux.cfg' |
---|
70 | NETWORK='network' |
---|
71 | FILENAME='filename' |
---|
72 | START='start' |
---|
73 | END='end' |
---|
74 | VERSION='0.4.4' |
---|
75 | |
---|
76 | SHORTOPT_LIST='hVd:n:s:e:f:' |
---|
77 | LONGOPT_LIST=['help', 'version', 'directory=', 'net=', 'start=', 'end=', 'file='] |
---|
78 | |
---|
79 | def select_pxe_configfile(): |
---|
80 | """ |
---|
81 | Let user choose which pxeconfig file to use. |
---|
82 | """ |
---|
83 | |
---|
84 | os.chdir(PXE_CONF_DIR) |
---|
85 | |
---|
86 | # Try to determine to which file the default symlink points, and |
---|
87 | # if it exists, remove it from the list. |
---|
88 | # |
---|
89 | try: |
---|
90 | default_file = os.readlink('default') |
---|
91 | except OSError: |
---|
92 | default_file = None |
---|
93 | pass |
---|
94 | |
---|
95 | files = glob.glob('default.*') |
---|
96 | if not files: |
---|
97 | print 'There are no pxe config files starting with: default.' |
---|
98 | sys.exit(1) |
---|
99 | |
---|
100 | if default_file: |
---|
101 | files.remove(default_file) |
---|
102 | |
---|
103 | |
---|
104 | print 'Which pxe config file must we use: ?' |
---|
105 | i = 1 |
---|
106 | for file in files: |
---|
107 | print "%d : %s" %(i,file) |
---|
108 | i = i +1 |
---|
109 | |
---|
110 | while 1: |
---|
111 | index = raw_input('Select a number: ') |
---|
112 | try: |
---|
113 | index = int(index) |
---|
114 | except ValueError: |
---|
115 | index = len(files) + 1 |
---|
116 | |
---|
117 | # Is the user smart enough to select |
---|
118 | # the right value?? |
---|
119 | # |
---|
120 | if 0 < index <= len(files): break |
---|
121 | |
---|
122 | return files[index-1] |
---|
123 | |
---|
124 | def create_links(dict): |
---|
125 | """ |
---|
126 | Create the links in the PXE_CONF_DIR, |
---|
127 | list : A list containing: network hex address, pxe config file, |
---|
128 | start number, end number |
---|
129 | """ |
---|
130 | os.chdir(PXE_CONF_DIR) |
---|
131 | naddr = dict[NETWORK] |
---|
132 | pxe_filename = dict[FILENAME] |
---|
133 | for i in range(dict[START], dict[END]+1): |
---|
134 | haddr = '%s%02X' %(naddr, i) |
---|
135 | if DEBUG: |
---|
136 | print 'linking %s to %s' %(haddr, pxe_filename) |
---|
137 | |
---|
138 | if os.path.exists(haddr): |
---|
139 | os.unlink(haddr) |
---|
140 | |
---|
141 | os.symlink(pxe_filename, haddr) |
---|
142 | |
---|
143 | |
---|
144 | def check_network(net, prefix=''): |
---|
145 | """ |
---|
146 | This function checks if the give network is a Class C-network and will |
---|
147 | convert the network address to a hex address if true. |
---|
148 | """ |
---|
149 | d = string.split(net, '.') |
---|
150 | |
---|
151 | if len(d) != 3: |
---|
152 | if prefix: |
---|
153 | net = prefix + ' : ' + net |
---|
154 | |
---|
155 | print '%s is not a valid C-class network address!!!' %net |
---|
156 | sys.exit(1) |
---|
157 | |
---|
158 | |
---|
159 | # Display right message for interactive/commandline |
---|
160 | if prefix: |
---|
161 | prefix = prefix + ' ' + net |
---|
162 | else: |
---|
163 | prefix = net |
---|
164 | |
---|
165 | # Check if we have valid network values |
---|
166 | r = '' |
---|
167 | for i in d: |
---|
168 | i = check_number(i, prefix) |
---|
169 | r = '%s%02X' %(r,i) |
---|
170 | |
---|
171 | if DEBUG: |
---|
172 | print r |
---|
173 | |
---|
174 | return r |
---|
175 | |
---|
176 | def check_number(number, prefix=''): |
---|
177 | """ |
---|
178 | This functions checks if the input is between 0 < number < 255: |
---|
179 | number : is a string |
---|
180 | prefix ; a string that must be displayed if an error occurs |
---|
181 | """ |
---|
182 | try: |
---|
183 | n = int(number) |
---|
184 | except ValueError, detail: |
---|
185 | print prefix,detail |
---|
186 | sys.exit(1) |
---|
187 | |
---|
188 | if 0 <= n <= 255: |
---|
189 | return n |
---|
190 | else: |
---|
191 | |
---|
192 | if prefix: |
---|
193 | number = prefix +' : ' + number |
---|
194 | |
---|
195 | print '%s is not a valid number, must be between 0 and 255' %number |
---|
196 | sys.exit(1) |
---|
197 | |
---|
198 | def interactive(binfo): |
---|
199 | |
---|
200 | print __doc__ |
---|
201 | |
---|
202 | network = raw_input('Give network address (xxx.xxx.xxx): ') |
---|
203 | naddr = check_network(network) |
---|
204 | |
---|
205 | start = raw_input('Starting number: ') |
---|
206 | start = check_number(start) |
---|
207 | |
---|
208 | end = raw_input('Ending number: ') |
---|
209 | end = check_number(end) |
---|
210 | |
---|
211 | pxe_filename = select_pxe_configfile() |
---|
212 | |
---|
213 | binfo[NETWORK] = naddr |
---|
214 | binfo[START] = int(start) |
---|
215 | binfo[END] = int(end) |
---|
216 | binfo[FILENAME] = pxe_filename |
---|
217 | |
---|
218 | if DEBUG: |
---|
219 | print network, binfo |
---|
220 | |
---|
221 | def check_cmd_line(binfo): |
---|
222 | if len(binfo.keys()) != 4: |
---|
223 | print __doc__ |
---|
224 | print 'Not enough arguments to create the links!!' |
---|
225 | sys.exit(1) |
---|
226 | |
---|
227 | # check_filename |
---|
228 | # |
---|
229 | if not os.path.isfile(os.path.join(PXE_CONF_DIR, binfo[FILENAME])): |
---|
230 | print '%s: Filename does not exists' %binfo[FILENAME] |
---|
231 | sys.exit(1) |
---|
232 | |
---|
233 | def check_args(argv, binfo): |
---|
234 | """ |
---|
235 | This function parses the command line options: |
---|
236 | argv : a list of command line options. |
---|
237 | binfo: returning a dict with the netinfo. if used non-interactively |
---|
238 | """ |
---|
239 | global PXE_CONF_DIR |
---|
240 | |
---|
241 | try: |
---|
242 | opts, args = getopt.getopt(argv[1:], SHORTOPT_LIST, LONGOPT_LIST) |
---|
243 | except getopt.error, detail: |
---|
244 | print __doc__ |
---|
245 | print detail |
---|
246 | sys.exit(1) |
---|
247 | |
---|
248 | # Check given options |
---|
249 | # |
---|
250 | for opt,value in opts: |
---|
251 | if opt in ['-d', '--directory']: |
---|
252 | if os.path.isdir(value): |
---|
253 | PXE_CONF_DIR = value |
---|
254 | else: |
---|
255 | print 'Directory %s does not exists\n' %value |
---|
256 | sys.exit(1) |
---|
257 | |
---|
258 | elif opt in ['-n', '--net']: |
---|
259 | network = value |
---|
260 | binfo[NETWORK] = check_network(value, opt) |
---|
261 | |
---|
262 | elif opt in ['-s', '--start']: |
---|
263 | binfo[START] = check_number(value, opt) |
---|
264 | |
---|
265 | elif opt in ['-e', '--end']: |
---|
266 | binfo[END] = check_number(value, opt) |
---|
267 | |
---|
268 | elif opt in ['-f', '--file']: |
---|
269 | binfo[FILENAME] = value |
---|
270 | |
---|
271 | elif opt in ['-V', '--version']: |
---|
272 | print VERSION |
---|
273 | sys.exit(0) |
---|
274 | |
---|
275 | elif opt in ['-h', '--help']: |
---|
276 | print __doc__ |
---|
277 | sys.exit(0) |
---|
278 | |
---|
279 | |
---|
280 | def main(): |
---|
281 | # A dictionary holding the boot info |
---|
282 | # |
---|
283 | bootinfo = {} |
---|
284 | check_args(sys.argv, bootinfo) |
---|
285 | |
---|
286 | if bootinfo: |
---|
287 | check_cmd_line(bootinfo) |
---|
288 | else: |
---|
289 | interactive(bootinfo) |
---|
290 | |
---|
291 | create_links(bootinfo) |
---|
292 | |
---|
293 | if __name__ == '__main__': |
---|
294 | main() |
---|