ifupdown2/ifupdownaddons/dhclient.py

   1 #!/usr/bin/python
   2 #
   3 # Copyright 2014 Cumulus Networks, Inc. All rights reserved.
   4 # Author: Roopa Prabhu, roopa@cumulusnetworks.com
   5 #
   6
   7 from utilsbase import *
   8 import subprocess
   9 import os
  10
  11 FNULL = open(os.devnull, 'w')
  12
  13 class dhclient(utilsBase):
  14     """ This class contains helper methods to interact with the dhclient
  15     utility """
  16
  17     def _pid_exists(self, pidfilename):
  18         if os.path.exists(pidfilename):
  19             pid = self.read_file_oneline(pidfilename)
  20             if not os.path.exists('/proc/%s' %pid):
  21                 return False
  22         else:
  23             return False
  24         return True
  25
  26     def is_running(self, ifacename):
  27         return self._pid_exists('/run/dhclient.%s.pid' %ifacename)
  28
  29     def is_running6(self, ifacename):
  30         return self._pid_exists('/run/dhclient6.%s.pid' %ifacename)
  31
  32     def stop(self, ifacename):
  33         if os.path.exists('/sbin/dhclient3'):
  34             cmd = ['/sbin/dhclient3', '-x', '-pf',
  35                    '/run/dhclient.%s.pid' %ifacename, '-lf',
  36                    '/var/lib/dhcp3/dhclient.%s.leases' %ifacename,
  37                    '%s' %ifacename]
  38         else:
  39             cmd = ['/sbin/dhclient', '-x', '-pf',
  40                    '/run/dhclient.%s.pid' %ifacename,
  41                    '-lf', '/var/lib/dhcp/dhclient.%s.leases' %ifacename,
  42                    '%s' %ifacename]
  43         self.subprocess_check_call(cmd)
  44
  45     def start(self, ifacename):
  46         if os.path.exists('/sbin/dhclient3'):
  47             cmd = ['/sbin/dhclient3', '-pf',
  48                    '/run/dhclient.%s.pid' %ifacename,
  49                    '-lf', '/var/lib/dhcp3/dhclient.%s.leases' %ifacename,
  50                    '%s' %ifacename]
  51         else:
  52             cmd = ['/sbin/dhclient', '-pf', '/run/dhclient.%s.pid' %ifacename,
  53                    '-lf', '/var/lib/dhcp/dhclient.%s.leases' %ifacename,
  54                    '%s' %ifacename]
  55         self.subprocess_check_call(cmd)
  56
  57     def release(self, ifacename):
  58         if os.path.exists('/sbin/dhclient3'):
  59             cmd = ['/sbin/dhclient3', '-r', '-pf',
  60                    '/run/dhclient.%s.pid' %ifacename, '-lf',
  61                    '/var/lib/dhcp3/dhclient.%s.leases' %ifacename,
  62                    '%s' %ifacename]
  63         else:
  64             cmd = ['/sbin/dhclient', '-r', '-pf',
  65                    '/run/dhclient.%s.pid' %ifacename,
  66                    '-lf', '/var/lib/dhcp/dhclient.%s.leases' %ifacename,
  67                    '%s' %ifacename]
  68         self.subprocess_check_call(cmd)
  69
  70     def start6(self, ifacename):
  71         self.subprocess_check_call(['dhclient', '-6', '-pf',
  72                 '/run/dhclient6.%s.pid' %ifacename, '-lf',
  73                 '/var/lib/dhcp/dhclient.%s.leases ' %ifacename,
  74                 '%s' %ifacename])
  75
  76     def stop6(self, ifacename):
  77         self.subprocess_check_call(['dhclient', '-6', '-x', '-pf',
  78                 '/run/dhclient.%s.pid' %ifacename, '-lf',
  79                 '/var/lib/dhcp/dhclient.%s.leases ' %ifacename,
  80                 '%s' %ifacename])
  81
  82     def release6(self, ifacename):
  83         self.subprocess_check_call(['dhclient', '-6', '-r', '-pf',
  84                 '/run/dhclient6.%s.pid' %ifacename, '-lf',
  85                 '/var/lib/dhcp/dhclient6.%s.leases' %ifacename,
  86                 '%s' %ifacename])