ifupdown2/ifupdownaddons/dhclient.py

   1 #!/usr/bin/python
   2 #
   3 # Copyright 2014-2017 Cumulus Networks, Inc. All rights reserved.
   4 # Author: Roopa Prabhu, roopa@cumulusnetworks.com
   5 #
   6
   7 import os
   8
   9 try:
  10     from ifupdown2.ifupdown.utils import utils
  11     from ifupdown2.ifupdownaddons.utilsbase import *
  12 except ImportError:
  13     from ifupdown.utils import utils
  14     from ifupdownaddons.utilsbase import *
  15
  16
  17 class dhclient(utilsBase):
  18     """ This class contains helper methods to interact with the dhclient
  19     utility """
  20
  21     def _pid_exists(self, pidfilename):
  22         if os.path.exists(pidfilename):
  23             pid = self.read_file_oneline(pidfilename)
  24             if not os.path.exists('/proc/%s' %pid):
  25                 return False
  26         else:
  27             return False
  28         return True
  29
  30     def is_running(self, ifacename):
  31         return self._pid_exists('/run/dhclient.%s.pid' %ifacename)
  32
  33     def is_running6(self, ifacename):
  34         return self._pid_exists('/run/dhclient6.%s.pid' %ifacename)
  35
  36     def _run_dhclient_cmd(self, cmd, cmd_prefix=None):
  37         if not cmd_prefix:
  38             cmd_aslist = []
  39         else:
  40             cmd_aslist = cmd_prefix.split()
  41         if cmd_aslist:
  42             cmd_aslist.extend(cmd)
  43         else:
  44             cmd_aslist = cmd
  45         utils.exec_commandl(cmd_aslist, stdout=None, stderr=None)
  46
  47     def stop(self, ifacename, cmd_prefix=None):
  48         if os.path.exists('/sbin/dhclient3'):
  49             cmd = ['/sbin/dhclient3', '-x', '-pf',
  50                    '/run/dhclient.%s.pid' %ifacename, '-lf',
  51                    '/var/lib/dhcp3/dhclient.%s.leases' %ifacename,
  52                    '%s' %ifacename]
  53         else:
  54             cmd = ['/sbin/dhclient', '-x', '-pf',
  55                    '/run/dhclient.%s.pid' %ifacename,
  56                    '-lf', '/var/lib/dhcp/dhclient.%s.leases' %ifacename,
  57                    '%s' %ifacename]
  58         self._run_dhclient_cmd(cmd, cmd_prefix)
  59
  60     def start(self, ifacename, wait=True, cmd_prefix=None):
  61         if os.path.exists('/sbin/dhclient3'):
  62             cmd = ['/sbin/dhclient3', '-pf',
  63                    '/run/dhclient.%s.pid' %ifacename,
  64                    '-lf', '/var/lib/dhcp3/dhclient.%s.leases' %ifacename,
  65                    '%s' %ifacename]
  66         else:
  67             cmd = ['/sbin/dhclient', '-pf',
  68                    '/run/dhclient.%s.pid' %ifacename, '-lf',
  69                    '/var/lib/dhcp/dhclient.%s.leases' %ifacename,
  70                    '%s' %ifacename]
  71         if not wait:
  72             cmd.append('-nw')
  73         self._run_dhclient_cmd(cmd, cmd_prefix)
  74
  75     def release(self, ifacename, cmd_prefix=None):
  76         if os.path.exists('/sbin/dhclient3'):
  77             cmd = ['/sbin/dhclient3', '-r', '-pf',
  78                    '/run/dhclient.%s.pid' %ifacename, '-lf',
  79                    '/var/lib/dhcp3/dhclient.%s.leases' %ifacename,
  80                    '%s' %ifacename]
  81         else:
  82             cmd = ['/sbin/dhclient', '-r', '-pf',
  83                    '/run/dhclient.%s.pid' %ifacename,
  84                    '-lf', '/var/lib/dhcp/dhclient.%s.leases' %ifacename,
  85                    '%s' %ifacename]
  86         self._run_dhclient_cmd(cmd, cmd_prefix)
  87
  88     def start6(self, ifacename, wait=True, cmd_prefix=None):
  89         cmd = ['/sbin/dhclient', '-6', '-pf',
  90                 '/run/dhclient6.%s.pid' %ifacename, '-lf',
  91                 '/var/lib/dhcp/dhclient6.%s.leases' % ifacename,
  92                 '%s' %ifacename]
  93         if not wait:
  94             cmd.append('-nw')
  95         self._run_dhclient_cmd(cmd, cmd_prefix)
  96
  97     def stop6(self, ifacename, cmd_prefix=None):
  98         cmd = ['/sbin/dhclient', '-6', '-x', '-pf',
  99                '/run/dhclient6.%s.pid' % ifacename, '-lf',
 100                '/var/lib/dhcp/dhclient6.%s.leases' % ifacename,
 101                '%s' %ifacename]
 102         self._run_dhclient_cmd(cmd, cmd_prefix)
 103
 104     def release6(self, ifacename, cmd_prefix=None):
 105         cmd = ['/sbin/dhclient', '-6', '-r', '-pf',
 106                '/run/dhclient6.%s.pid' %ifacename,
 107               '-lf', '/var/lib/dhcp/dhclient6.%s.leases' % ifacename,
 108                '%s' %ifacename]
 109         self._run_dhclient_cmd(cmd, cmd_prefix)