1 | # Copyright (C) 2002 |
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2 | # |
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3 | # This file is part of the pxeconfig utils |
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4 | # |
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5 | # This program is free software; you can redistribute it and/or modify it |
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6 | # under the terms of the GNU General Public License as published by the |
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7 | # Free Software Foundation; either version 2, or (at your option) any |
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8 | # later version. |
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9 | # |
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10 | # This program is distributed in the hope that it will be useful, |
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11 | # but WITHOUT ANY WARRANTY; without even the implied warranty of |
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12 | # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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13 | # GNU General Public License for more details. |
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14 | # |
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15 | # You should have received a copy of the GNU General Public License |
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16 | # along with this program; if not, write to the Free Software |
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17 | # Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA |
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18 | # |
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19 | # SVN info |
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20 | # $Id: pxeconfigd.py 206 2012-12-18 11:53:42Z bas $ |
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21 | """ |
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22 | Author: Bas van der Vlies <basv@sara.nl> |
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23 | Date : 12 February 2002 |
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24 | Desc. : This script is used to control how a node is booted with PXE |
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25 | enabled network cards. The node boots and fetch a pxe |
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26 | config file which tells how the node must boot. This daemon |
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27 | enables a client to remove his/here pxe config file. With the |
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28 | next boot it will use the default one. |
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29 | |
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30 | command line option: |
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31 | -V/--version |
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32 | Prints the version number and exits |
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33 | |
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34 | Note: |
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35 | This server can ONLY be started from inetd/xinetd. |
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36 | """ |
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37 | import time |
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38 | import socket |
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39 | import sys |
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40 | import os |
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41 | import string |
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42 | import syslog |
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43 | import getopt |
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44 | |
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45 | # PXE modules |
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46 | from pxe_global import * |
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47 | |
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48 | # DEBUG |
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49 | # |
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50 | DEBUG=1 |
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51 | |
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52 | # Some Global Constants |
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53 | # |
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54 | BUFSIZE=4096 |
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55 | STDIN=0 |
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56 | STDOUT=1 |
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57 | SHORTOPT_LIST='V' |
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58 | LONGOPT_LIST=['version'] |
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59 | |
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60 | PXE_CONF_DIR = '/tftpboot/pxelinux.cfg' |
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61 | VERSION = '4.2.0' |
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62 | |
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63 | # Give the current time |
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64 | # |
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65 | def now(): |
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66 | return time.ctime(time.time()) |
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67 | |
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68 | |
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69 | def remove_link(ip, arp_cmd): |
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70 | """ |
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71 | This removes the pxe config filename for the host that is connected: |
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72 | ip : ip address of the client host |
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73 | arp_cmd : For Dynamic ips, look up the mac address via arp |
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74 | """ |
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75 | |
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76 | ## translate ip address ---> hex address |
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77 | # |
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78 | d = string.split(ip, '.') |
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79 | haddr = '%02X%02X%02X%02X' %(int(d[0]), int(d[1]), int(d[2]), int(d[3])) |
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80 | |
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81 | file = os.path.join(PXE_CONF_DIR, haddr) |
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82 | if DEBUG: |
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83 | print file |
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84 | |
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85 | if not os.path.exists(file): |
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86 | |
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87 | ## |
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88 | # No ARP command set, just return |
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89 | # |
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90 | if not arp_cmd: |
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91 | return |
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92 | |
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93 | else: |
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94 | ## |
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95 | # arp -n 192.168.146.112 |
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96 | # Address HWtype HWaddress Flags Mask Iface |
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97 | # 192.168.146.112 ether 00:23:ae:fd:cf:74 C vlan133 |
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98 | |
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99 | cmd = '%s %s' %(arp_cmd, ip) |
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100 | lines = os.popen(cmd).readlines() |
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101 | for line in lines: |
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102 | if line.startswith(ip): |
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103 | t = line.split() |
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104 | mac_addr = t[2] |
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105 | haddr = '01-%s' %(mac_addr.replace(':', '-').lower()) |
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106 | |
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107 | file = os.path.join(PXE_CONF_DIR, haddr) |
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108 | if DEBUG: |
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109 | print file |
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110 | |
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111 | if not os.path.exists(file): |
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112 | return |
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113 | |
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114 | if DEBUG: |
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115 | print 'file = %s' %file |
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116 | |
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117 | if os.path.islink(file): |
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118 | try: |
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119 | os.unlink(file) |
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120 | syslog.openlog("pxeconfigd") |
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121 | syslog.syslog(syslog.LOG_INFO, file) |
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122 | syslog.closelog() |
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123 | except OSError: |
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124 | err_msg = "No permission at directory: %s" %PXE_CONF_DIR |
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125 | os.write(STDOUT, err_msg) |
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126 | sys.exit(1) |
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127 | |
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128 | |
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129 | # This function handles the client connection. It closes |
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130 | # the connection if there is no data |
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131 | # |
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132 | def handleConnection(settings): |
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133 | """ |
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134 | Determines which host connects to the server |
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135 | """ |
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136 | |
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137 | # Determine client address |
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138 | # |
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139 | try: |
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140 | client_addr = socket.fromfd(sys.stdin.fileno(), socket.AF_INET, |
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141 | socket.SOCK_STREAM) |
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142 | client_ip = client_addr.getpeername()[0] |
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143 | except socket.error, detail: |
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144 | error = "pxeconfigd can only be started from inetd!!!" |
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145 | raise PxeConfig, error |
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146 | |
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147 | |
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148 | if DEBUG: |
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149 | print 'ip = %s' %(client_ip) |
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150 | |
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151 | try: |
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152 | cmd = '%s %s' %(settings['daemon_script_hook'], client_ip) |
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153 | print cmd |
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154 | os.system(cmd) |
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155 | except KeyError: |
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156 | pass |
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157 | |
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158 | try: |
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159 | arp_cmd = settings['arp_command'] |
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160 | except KeyError: |
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161 | arp_cmd = None |
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162 | |
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163 | remove_link(client_ip, arp_cmd) |
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164 | sys.exit(0) |
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165 | |
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166 | def check_args(argv, settings): |
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167 | """ |
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168 | Must we use another directory for the PXE configuration |
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169 | """ |
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170 | global PXE_CONF_DIR |
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171 | |
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172 | try: |
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173 | opts, args = getopt.getopt(argv[1:], SHORTOPT_LIST, LONGOPT_LIST) |
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174 | except getopt.error, detail: |
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175 | print __doc__ |
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176 | print detail |
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177 | sys.exit(1) |
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178 | |
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179 | for opt, value in opts: |
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180 | if opt in ['-V', '--version']: |
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181 | print VERSION |
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182 | sys.exit(0) |
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183 | |
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184 | try: |
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185 | PXE_CONF_DIR = settings['pxe_config_dir'] |
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186 | except KeyError: |
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187 | pass |
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188 | |
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189 | PXE_CONF_DIR = os.path.realpath(PXE_CONF_DIR) |
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190 | if not os.path.isdir(PXE_CONF_DIR): |
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191 | error = 'pxeconfig directory: %s does not exists' %(PXE_CONF_DIR) |
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192 | raise PxeConfig, error |
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193 | |
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194 | def server(): |
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195 | """Start the daemon |
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196 | """ |
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197 | parser_config, default_settings = ReadConfig() |
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198 | check_args(sys.argv, default_settings) |
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199 | handleConnection(default_settings) |
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200 | |
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201 | if __name__ == '__main__': |
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202 | server() |
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