1 | #!/usr/bin/env python |
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2 | # Copyright (C) 2000, SARA. |
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3 | # |
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4 | # Permission to use, copy, modify, and distribute this software and its |
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5 | # documentation for non-commercial purposes and without fee is hereby |
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6 | # granted, provided that the above copyright notice appears in all copies |
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7 | # and that both the copyright notice and this permission notice appear in |
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8 | # supporting documentation. |
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9 | # |
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10 | # Neither SARA (Stichting Academisch Rekencentrum Amsterdam) nor the |
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11 | # nor the author make any representations about the suitability of this |
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12 | # software for any purpose. This software is provided ``as is'' without |
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13 | # express or implied warranty. |
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14 | # |
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15 | # |
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16 | """ |
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17 | Author: Bas van der Vlies <basv@sara.nl> |
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18 | Date : 12 February 2002 |
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19 | Desc. : This script is used to control how a node is booted with PXE |
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20 | enabled network cards. The node boots and fetch a pxe |
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21 | config file which tells how the node must boot. This daemon |
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22 | enables a client to remove his/here pxe config file. With the |
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23 | next boot it will use the default one. |
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24 | |
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25 | command line option: |
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26 | -d/--directory <dir> |
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27 | Where <dir> is the directory where the pxe config files reside. |
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28 | |
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29 | Note: |
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30 | This server can ONLY be started from inetd. |
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31 | |
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32 | CVS info |
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33 | $Date: 2002/02/21 13:21:52 $ |
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34 | $Revision: 1.4 $ |
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35 | """ |
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36 | import time |
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37 | import socket |
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38 | import sys |
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39 | import os |
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40 | import string |
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41 | import syslog |
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42 | import getopt |
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43 | |
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44 | # DEBUG |
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45 | # |
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46 | DEBUG=1 |
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47 | |
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48 | # Some Global Constants |
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49 | # |
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50 | BUFSIZE=4096 |
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51 | STDIN=0 |
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52 | STDOUT=1 |
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53 | SHORTOPT_LIST='d:' |
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54 | LONGOPT_LIST=['directory='] |
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55 | |
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56 | PXE_CONF_DIR = '/tftpboot/pxelinux.cfg' |
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57 | |
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58 | # Give the current time |
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59 | # |
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60 | def now(): |
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61 | return time.ctime(time.time()) |
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62 | |
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63 | |
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64 | def remove_link(filename): |
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65 | """This removes the pxe config filename for the host that is connected: |
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66 | filename : string |
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67 | """ |
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68 | |
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69 | file = os.path.join(PXE_CONF_DIR, filename) |
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70 | |
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71 | if DEBUG: |
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72 | print 'file = %s' %file |
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73 | |
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74 | if not os.path.exists(file): return |
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75 | |
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76 | if os.path.islink(file): |
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77 | try: |
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78 | os.unlink(file) |
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79 | syslog.openlog("pxeconfigd") |
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80 | syslog.syslog(syslog.LOG_INFO, file) |
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81 | syslog.closelog() |
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82 | except OSError: |
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83 | err_msg = "No permission at directory: %s" %PXE_CONF_DIR |
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84 | os.write(STDOUT, err_msg) |
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85 | sys.exit(1) |
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86 | |
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87 | # This function handles the client connection. It closes |
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88 | # the connection if there is no data |
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89 | # |
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90 | def handleConnection(): |
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91 | """Determines which host connects to the server |
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92 | """ |
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93 | |
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94 | # Determine client address |
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95 | # |
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96 | try: |
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97 | client_addr = socket.fromfd(sys.stdin.fileno(), socket.AF_INET, |
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98 | socket.SOCK_STREAM) |
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99 | client_ip = client_addr.getpeername()[0] |
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100 | |
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101 | except socket.error, detail: |
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102 | print "pxeconfigd can only be started from inetd!!!" |
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103 | sys.exit(1) |
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104 | |
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105 | |
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106 | # translate ip address ---> hex address |
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107 | # |
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108 | d = string.split(client_ip, '.') |
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109 | client_haddr = '%02X%02X%02X%02X' %(int(d[0]), int(d[1]), int(d[2]), int(d[3])) |
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110 | |
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111 | if DEBUG: |
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112 | print 'ip = %s, hex = %s' %(client_ip, client_haddr) |
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113 | |
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114 | remove_link(client_haddr) |
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115 | sys.exit(0) |
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116 | |
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117 | def check_args(argv): |
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118 | """ |
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119 | Must we use another directory for the PXE configuration |
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120 | """ |
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121 | global PXE_CONF_DIR |
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122 | |
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123 | try: |
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124 | opts, args = getopt.getopt(argv[1:], SHORTOPT_LIST, LONGOPT_LIST) |
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125 | except getopt.error, detail: |
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126 | print __doc__ |
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127 | print detail |
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128 | sys.exit(1) |
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129 | |
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130 | if opts: |
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131 | opt, PXE_CONF_DIR = opts[0] |
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132 | |
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133 | def server(): |
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134 | """Start the daemon |
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135 | """ |
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136 | check_args(sys.argv) |
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137 | |
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138 | if not os.path.isdir(PXE_CONF_DIR): |
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139 | os.write(STDOUT, "PXE booting is not configured") |
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140 | sys.exit(1) |
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141 | |
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142 | handleConnection() |
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143 | |
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144 | if __name__ == '__main__': |
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145 | server() |
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