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