[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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[3] | 9 | # $Date: 2002/02/19 09:38:10 $ |
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| 10 | # $Revision: 1.2 $ |
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[2] | 11 | # |
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| 12 | """ |
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| 13 | With this program you can configure which PXE configuration file |
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| 14 | to use when a node boots. The programm will ask the following questions: |
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| 15 | 1) Network address (Class C-network address only) |
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| 16 | 2) Starting nummber |
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| 17 | 3) Ending number |
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| 18 | 4) Which PXE config file to use. |
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| 19 | |
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| 20 | For example, if the answers are: |
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| 21 | 1) 10.168.44 |
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| 22 | 2) 2 |
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| 23 | 3) 4 |
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| 24 | 4) default.node_install |
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| 25 | |
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| 26 | Then the result is that is create symbolic links in /tftpboot/pxelinux.cfg: |
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| 27 | 0AA82C02 ----> default.node_install |
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| 28 | 0AA82C03 ----> default.node_install |
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| 29 | 0AA82C04 ----> default.node_install |
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| 30 | """ |
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| 31 | |
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| 32 | import string |
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| 33 | import sys |
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| 34 | import os |
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| 35 | import glob |
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[3] | 36 | import getopt |
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[2] | 37 | |
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| 38 | # DEBUG |
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| 39 | # |
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| 40 | DEBUG=0 |
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| 41 | |
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| 42 | # Constants |
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| 43 | # |
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| 44 | PXE_CONFIG_DIR='/tftpboot/pxelinux.cfg' |
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| 45 | NADDR=0 |
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| 46 | PXEFILE=1 |
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| 47 | START=2 |
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| 48 | END=3 |
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[3] | 49 | SHORTOPT_LIST='d:' |
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| 50 | LONGOPT_LIST=['directory='] |
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[2] | 51 | |
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| 52 | def choice_pxe_configfile(): |
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| 53 | """ |
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| 54 | Let user choice which pxeconfig file to use. |
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| 55 | """ |
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| 56 | |
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| 57 | os.chdir(PXE_CONFIG_DIR) |
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| 58 | |
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| 59 | # Try to determine to which default file point to and |
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| 60 | # if exists remove it from te list. |
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| 61 | # |
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| 62 | try: |
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| 63 | default_file = os.readlink('default') |
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| 64 | except OSError: |
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| 65 | default_file = None |
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| 66 | pass |
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| 67 | |
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| 68 | files = glob.glob('default.*') |
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| 69 | if not files: |
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| 70 | print 'There are no pxe config files starting with: default.' |
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| 71 | sys.exit(1) |
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| 72 | |
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| 73 | if default_file: |
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| 74 | files.remove(default_file) |
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| 75 | |
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| 76 | |
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| 77 | print 'Which pxe config file must we use: ?' |
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| 78 | i = 1 |
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| 79 | for file in files: |
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| 80 | print "%d : %s" %(i,file) |
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| 81 | i = i +1 |
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| 82 | |
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| 83 | while 1: |
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| 84 | index = raw_input('Choice a number: ') |
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| 85 | try: |
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| 86 | index = int(index) |
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| 87 | except ValueError: |
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| 88 | index = len(files) + 1 |
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| 89 | |
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| 90 | # Is the user smart enough to select |
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| 91 | # the right value |
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| 92 | # |
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| 93 | if 0 < index <= len(files): break |
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| 94 | |
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| 95 | return files[index-1] |
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| 96 | |
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| 97 | def create_links(list): |
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| 98 | """ |
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| 99 | Create the links in the PXE_CONFIG_DIR, |
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| 100 | list : A list containing: network hex addres, pxe config file, |
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| 101 | start number, end number |
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| 102 | """ |
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| 103 | os.chdir(PXE_CONFIG_DIR) |
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| 104 | naddr = list[NADDR] |
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| 105 | pxe_filename = list[PXEFILE] |
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| 106 | for i in range(list[START], list[END]+1): |
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| 107 | haddr = '%s%02X' %(naddr, i) |
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| 108 | if DEBUG: |
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| 109 | print 'linking %s to %s' %(haddr, pxe_filename) |
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| 110 | os.symlink(pxe_filename, haddr) |
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| 111 | |
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| 112 | |
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| 113 | def check_network(net): |
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| 114 | """ |
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| 115 | This function check if the give network is a Class C-network and will |
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| 116 | convert the network address to a hex address if true. |
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| 117 | """ |
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| 118 | d = string.split(net, '.') |
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| 119 | |
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| 120 | if len(d) != 3: |
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| 121 | print('Only C-class nerwork addresses are supported!!!') |
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| 122 | sys.exit(1) |
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| 123 | |
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| 124 | # Check if we have valid network values |
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| 125 | r = '' |
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| 126 | for i in d: |
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| 127 | i = check_number(i) |
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| 128 | r = '%s%02X' %(r,i) |
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| 129 | |
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| 130 | if DEBUG: |
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| 131 | print r |
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| 132 | |
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| 133 | return r |
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| 134 | |
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| 135 | def check_number(number): |
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| 136 | """ |
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| 137 | This functions checks if the input is between 0 < number < 255: |
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| 138 | number : is a string |
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| 139 | """ |
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| 140 | try: |
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| 141 | n = int(number) |
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| 142 | except ValueError, detail: |
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| 143 | print detail |
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| 144 | sys.exit(1) |
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| 145 | |
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| 146 | if 0 <= n <= 255: |
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| 147 | return n |
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| 148 | else: |
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| 149 | print '%s is not a valid number, must be between 0 and 255' %number |
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| 150 | sys.exit(1) |
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| 151 | |
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| 152 | def interactive(): |
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| 153 | |
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| 154 | iptable = {} |
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| 155 | |
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| 156 | print __doc__ |
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| 157 | |
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| 158 | network = raw_input('Give network addres (xxx.xxx.xxx): ') |
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| 159 | naddr = check_network(network) |
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| 160 | |
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| 161 | start = raw_input('Starting number: ') |
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| 162 | start = check_number(start) |
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| 163 | |
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| 164 | end = raw_input('Ending number: ') |
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| 165 | end = check_number(end) |
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| 166 | |
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| 167 | pxe_filename = choice_pxe_configfile() |
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| 168 | |
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| 169 | iptable[network] = [] |
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| 170 | iptable[network].append(naddr) |
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| 171 | iptable[network].append(pxe_filename) |
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| 172 | iptable[network].append(int(start)) |
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| 173 | iptable[network].append(int(end)) |
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| 174 | |
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| 175 | |
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| 176 | for net in iptable.keys(): |
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| 177 | if DEBUG: |
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| 178 | print net, iptable[net] |
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| 179 | create_links(iptable[net]) |
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| 180 | |
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[3] | 181 | def check_args(argv): |
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| 182 | """ |
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| 183 | Must we use another directory for the PXE configuration |
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| 184 | """ |
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| 185 | try: |
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| 186 | opts, args = getopt.getopt(argv[1:], SHORTOPT_LIST, LONGOPT_LIST) |
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| 187 | except getopt.error, detail: |
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| 188 | print __doc__ |
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| 189 | print detail |
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| 190 | sys.exit(1) |
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| 191 | |
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| 192 | if opts: |
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| 193 | opt, PXE_CONFIG_DIR = opts[0] |
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| 194 | |
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[2] | 195 | def main(): |
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[3] | 196 | check_args(sys.argv) |
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[2] | 197 | interactive() |
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| 198 | |
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| 199 | if __name__ == '__main__': |
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| 200 | main() |
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