[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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| 8 | # CVS info |
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[9] | 9 | # $Date: 2002/02/21 15:30:43 $ |
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| 10 | # $Revision: 1.5 $ |
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[2] | 11 | # |
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[6] | 12 | # Copyright (C) 2000, SARA. |
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| 13 | # |
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| 14 | # Permission to use, copy, modify, and distribute this software and its |
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| 15 | # documentation for non-commercial purposes and without fee is hereby |
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| 16 | # granted, provided that the above copyright notice appears in all copies |
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| 17 | # and that both the copyright notice and this permission notice appear in |
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| 18 | # supporting documentation. |
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| 19 | # |
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| 20 | # Neither SARA (Stichting Academisch Rekencentrum Amsterdam) nor the |
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| 21 | # nor the author make any representations about the suitability of this |
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| 22 | # software for any purpose. This software is provided ``as is'' without |
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| 23 | # express or implied warranty. |
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| 24 | # |
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| 25 | # |
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[2] | 26 | """ |
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| 27 | With this program you can configure which PXE configuration file |
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[9] | 28 | to use when a node boots. The program will ask the following questions: |
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[2] | 29 | 1) Network address (Class C-network address only) |
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[9] | 30 | 2) Starting number |
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[2] | 31 | 3) Ending number |
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[9] | 32 | 4) Which PXE config file to use |
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[2] | 33 | |
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| 34 | For example, if the answers are: |
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| 35 | 1) 10.168.44 |
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| 36 | 2) 2 |
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| 37 | 3) 4 |
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| 38 | 4) default.node_install |
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| 39 | |
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| 40 | Then the result is that is create symbolic links in /tftpboot/pxelinux.cfg: |
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| 41 | 0AA82C02 ----> default.node_install |
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| 42 | 0AA82C03 ----> default.node_install |
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| 43 | 0AA82C04 ----> default.node_install |
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| 44 | """ |
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| 45 | |
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| 46 | import string |
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| 47 | import sys |
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| 48 | import os |
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| 49 | import glob |
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[3] | 50 | import getopt |
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[2] | 51 | |
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| 52 | # DEBUG |
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| 53 | # |
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| 54 | DEBUG=0 |
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| 55 | |
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| 56 | # Constants |
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| 57 | # |
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[4] | 58 | PXE_CONF_DIR='/tftpboot/pxelinux.cfg' |
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[2] | 59 | NADDR=0 |
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| 60 | PXEFILE=1 |
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| 61 | START=2 |
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| 62 | END=3 |
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[3] | 63 | SHORTOPT_LIST='d:' |
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| 64 | LONGOPT_LIST=['directory='] |
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[2] | 65 | |
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| 66 | def choice_pxe_configfile(): |
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| 67 | """ |
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[9] | 68 | Let user choose which pxeconfig file to use. |
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[2] | 69 | """ |
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| 70 | |
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[4] | 71 | os.chdir(PXE_CONF_DIR) |
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[2] | 72 | |
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[9] | 73 | # Try to determine to which file the default symlink points, and |
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| 74 | # if it exists, remove it from the list. |
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[2] | 75 | # |
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| 76 | try: |
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| 77 | default_file = os.readlink('default') |
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| 78 | except OSError: |
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| 79 | default_file = None |
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| 80 | pass |
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| 81 | |
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| 82 | files = glob.glob('default.*') |
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| 83 | if not files: |
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| 84 | print 'There are no pxe config files starting with: default.' |
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| 85 | sys.exit(1) |
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| 86 | |
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| 87 | if default_file: |
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| 88 | files.remove(default_file) |
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| 89 | |
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| 90 | |
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| 91 | print 'Which pxe config file must we use: ?' |
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| 92 | i = 1 |
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| 93 | for file in files: |
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| 94 | print "%d : %s" %(i,file) |
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| 95 | i = i +1 |
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| 96 | |
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| 97 | while 1: |
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| 98 | index = raw_input('Choice a number: ') |
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| 99 | try: |
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| 100 | index = int(index) |
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| 101 | except ValueError: |
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| 102 | index = len(files) + 1 |
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| 103 | |
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| 104 | # Is the user smart enough to select |
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[9] | 105 | # the right value?? |
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[2] | 106 | # |
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| 107 | if 0 < index <= len(files): break |
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| 108 | |
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| 109 | return files[index-1] |
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| 110 | |
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| 111 | def create_links(list): |
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| 112 | """ |
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[4] | 113 | Create the links in the PXE_CONF_DIR, |
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[9] | 114 | list : A list containing: network hex address, pxe config file, |
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[2] | 115 | start number, end number |
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| 116 | """ |
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[4] | 117 | os.chdir(PXE_CONF_DIR) |
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[2] | 118 | naddr = list[NADDR] |
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| 119 | pxe_filename = list[PXEFILE] |
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| 120 | for i in range(list[START], list[END]+1): |
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| 121 | haddr = '%s%02X' %(naddr, i) |
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| 122 | if DEBUG: |
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| 123 | print 'linking %s to %s' %(haddr, pxe_filename) |
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| 124 | os.symlink(pxe_filename, haddr) |
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| 125 | |
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| 126 | |
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| 127 | def check_network(net): |
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| 128 | """ |
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[9] | 129 | This function checks if the give network is a Class C-network and will |
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[2] | 130 | convert the network address to a hex address if true. |
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| 131 | """ |
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| 132 | d = string.split(net, '.') |
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| 133 | |
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| 134 | if len(d) != 3: |
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| 135 | print('Only C-class nerwork addresses are supported!!!') |
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| 136 | sys.exit(1) |
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| 137 | |
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| 138 | # Check if we have valid network values |
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| 139 | r = '' |
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| 140 | for i in d: |
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| 141 | i = check_number(i) |
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| 142 | r = '%s%02X' %(r,i) |
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| 143 | |
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| 144 | if DEBUG: |
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| 145 | print r |
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| 146 | |
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| 147 | return r |
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| 148 | |
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| 149 | def check_number(number): |
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| 150 | """ |
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| 151 | This functions checks if the input is between 0 < number < 255: |
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| 152 | number : is a string |
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| 153 | """ |
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| 154 | try: |
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| 155 | n = int(number) |
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| 156 | except ValueError, detail: |
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| 157 | print detail |
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| 158 | sys.exit(1) |
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| 159 | |
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| 160 | if 0 <= n <= 255: |
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| 161 | return n |
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| 162 | else: |
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| 163 | print '%s is not a valid number, must be between 0 and 255' %number |
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| 164 | sys.exit(1) |
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| 165 | |
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| 166 | def interactive(): |
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| 167 | |
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| 168 | iptable = {} |
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| 169 | |
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| 170 | print __doc__ |
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| 171 | |
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[9] | 172 | network = raw_input('Give network address (xxx.xxx.xxx): ') |
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[2] | 173 | naddr = check_network(network) |
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| 174 | |
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| 175 | start = raw_input('Starting number: ') |
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| 176 | start = check_number(start) |
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| 177 | |
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| 178 | end = raw_input('Ending number: ') |
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| 179 | end = check_number(end) |
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| 180 | |
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| 181 | pxe_filename = choice_pxe_configfile() |
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| 182 | |
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| 183 | iptable[network] = [] |
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| 184 | iptable[network].append(naddr) |
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| 185 | iptable[network].append(pxe_filename) |
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| 186 | iptable[network].append(int(start)) |
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| 187 | iptable[network].append(int(end)) |
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| 188 | |
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| 189 | for net in iptable.keys(): |
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| 190 | if DEBUG: |
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| 191 | print net, iptable[net] |
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| 192 | create_links(iptable[net]) |
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| 193 | |
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[6] | 194 | |
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[3] | 195 | def check_args(argv): |
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| 196 | """ |
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[6] | 197 | command line option: |
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| 198 | -d/--directory <dir> |
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| 199 | Where <dir> is the directory where the pxe config files reside. |
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[3] | 200 | """ |
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[4] | 201 | global PXE_CONF_DIR |
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[3] | 202 | try: |
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| 203 | opts, args = getopt.getopt(argv[1:], SHORTOPT_LIST, LONGOPT_LIST) |
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| 204 | except getopt.error, detail: |
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[6] | 205 | print check_args.__doc__ |
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[3] | 206 | print detail |
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| 207 | sys.exit(1) |
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| 208 | |
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| 209 | if opts: |
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[4] | 210 | opt, PXE_CONF_DIR = opts[0] |
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[3] | 211 | |
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[4] | 212 | if not os.path.isdir(PXE_CONF_DIR): |
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| 213 | print 'Directory %s does not exists' %PXE_CONF_DIR |
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| 214 | sys.exit(1) |
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| 215 | |
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[2] | 216 | def main(): |
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[3] | 217 | check_args(sys.argv) |
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[2] | 218 | interactive() |
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| 219 | |
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| 220 | if __name__ == '__main__': |
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| 221 | main() |
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