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96dddc0eaf
Ticket: CM-13817 Reviewed By: Roopa, Kanna, Nikhil G Testing Done: 1) use inet and inet6 dhcp in interfaces file 2) do a ifup -v 3) make sure dhclient v4 and v6 is running 4) now remove inet6 dhcp section 5) ifreload -a -v (should kill dhclient6) 6) replace inet by inet6 7) ifreload -a -v (should kill dhclient4 and exec dhclient6) etc.. I played with all possible combinations Signed-off-by: Julien Fortin <julien@cumulusnetworks.com>
218 lines
8.9 KiB
Python
218 lines
8.9 KiB
Python
#!/usr/bin/python
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#
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# Copyright 2014 Cumulus Networks, Inc. All rights reserved.
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# Author: Roopa Prabhu, roopa@cumulusnetworks.com
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#
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try:
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import re
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from ipaddr import IPNetwork
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from sets import Set
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from ifupdown.iface import *
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import ifupdown.policymanager as policymanager
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from ifupdownaddons.modulebase import moduleBase
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from ifupdownaddons.dhclient import dhclient
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from ifupdownaddons.iproute2 import iproute2
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import ifupdown.ifupdownflags as ifupdownflags
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from ifupdown.utils import utils
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import time
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from ifupdown.netlink import netlink
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except ImportError, e:
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raise ImportError (str(e) + "- required module not found")
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class dhcp(moduleBase):
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""" ifupdown2 addon module to configure dhcp on interface """
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def __init__(self, *args, **kargs):
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moduleBase.__init__(self, *args, **kargs)
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self.dhclientcmd = dhclient(**kargs)
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self.ipcmd = None
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def syntax_check(self, ifaceobj, ifaceobj_getfunc):
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return self.is_dhcp_allowed_on(ifaceobj, syntax_check=True)
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def is_dhcp_allowed_on(self, ifaceobj, syntax_check):
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if ifaceobj.addr_method and 'dhcp' in ifaceobj.addr_method:
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return utils.is_addr_ip_allowed_on(ifaceobj, syntax_check=True)
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return True
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def _up(self, ifaceobj):
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# if dhclient is already running do not stop and start it
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dhclient4_running = self.dhclientcmd.is_running(ifaceobj.name)
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dhclient6_running = self.dhclientcmd.is_running6(ifaceobj.name)
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# today if we have an interface with both inet and inet6, if we
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# remove the inet or inet6 or both then execute ifreload, we need
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# to release/kill the appropriate dhclient(4/6) if they are running
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self._down_stale_dhcp_config(ifaceobj, 'inet', dhclient4_running)
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self._down_stale_dhcp_config(ifaceobj, 'inet6', dhclient6_running)
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try:
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dhclient_cmd_prefix = None
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dhcp_wait = policymanager.policymanager_api.get_attr_default(
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module_name=self.__class__.__name__, attr='dhcp-wait')
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wait = not str(dhcp_wait).lower() == "no"
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vrf = ifaceobj.get_attr_value_first('vrf')
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if (vrf and self.vrf_exec_cmd_prefix and
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self.ipcmd.link_exists(vrf)):
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dhclient_cmd_prefix = '%s %s' %(self.vrf_exec_cmd_prefix, vrf)
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if 'inet' in ifaceobj.addr_family:
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if dhclient4_running:
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self.logger.info('dhclient4 already running on %s. '
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'Not restarting.' % ifaceobj.name)
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else:
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# First release any existing dhclient processes
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try:
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if not ifupdownflags.flags.PERFMODE:
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self.dhclientcmd.stop(ifaceobj.name)
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except:
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pass
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self.dhclientcmd.start(ifaceobj.name, wait=wait,
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cmd_prefix=dhclient_cmd_prefix)
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if 'inet6' in ifaceobj.addr_family:
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if dhclient6_running:
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self.logger.info('dhclient6 already running on %s. '
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'Not restarting.' % ifaceobj.name)
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else:
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accept_ra = ifaceobj.get_attr_value_first('accept_ra')
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if accept_ra:
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# XXX: Validate value
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self.sysctl_set('net.ipv6.conf.%s' %ifaceobj.name +
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'.accept_ra', accept_ra)
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autoconf = ifaceobj.get_attr_value_first('autoconf')
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if autoconf:
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# XXX: Validate value
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self.sysctl_set('net.ipv6.conf.%s' %ifaceobj.name +
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'.autoconf', autoconf)
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try:
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self.dhclientcmd.stop6(ifaceobj.name)
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except:
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pass
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#add delay before starting IPv6 dhclient to
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#make sure the configured interface/link is up.
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time.sleep(2)
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timeout = 10
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while timeout:
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timeout -= 2
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addr_output = utils.exec_command('ip -6 addr show %s'
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% ifaceobj.name)
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r = re.search('inet6 .* scope link', addr_output)
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if r:
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self.dhclientcmd.start6(ifaceobj.name,
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wait=wait,
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cmd_prefix=dhclient_cmd_prefix)
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return
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time.sleep(2)
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except Exception, e:
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self.log_error(str(e), ifaceobj)
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def _down_stale_dhcp_config(self, ifaceobj, family, dhclientX_running):
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addr_family = ifaceobj.addr_family
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try:
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if not family in ifaceobj.addr_family and dhclientX_running:
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ifaceobj.addr_family = [family]
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self._dhcp_down(ifaceobj)
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except:
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pass
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finally:
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ifaceobj.addr_family = addr_family
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def _dhcp_down(self, ifaceobj):
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dhclient_cmd_prefix = None
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vrf = ifaceobj.get_attr_value_first('vrf')
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if (vrf and self.vrf_exec_cmd_prefix and
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self.ipcmd.link_exists(vrf)):
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dhclient_cmd_prefix = '%s %s' %(self.vrf_exec_cmd_prefix, vrf)
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if 'inet6' in ifaceobj.addr_family:
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self.dhclientcmd.release6(ifaceobj.name, dhclient_cmd_prefix)
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if 'inet' in ifaceobj.addr_family:
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self.dhclientcmd.release(ifaceobj.name, dhclient_cmd_prefix)
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def _down(self, ifaceobj):
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self._dhcp_down(ifaceobj)
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self.ipcmd.link_down(ifaceobj.name)
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def _query_check(self, ifaceobj, ifaceobjcurr):
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status = ifaceStatus.SUCCESS
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dhcp_running = False
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dhcp_v4 = self.dhclientcmd.is_running(ifaceobjcurr.name)
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dhcp_v6 = self.dhclientcmd.is_running6(ifaceobjcurr.name)
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if dhcp_v4:
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dhcp_running = True
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if 'inet' not in ifaceobj.addr_family and not dhcp_v6:
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status = ifaceStatus.ERROR
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ifaceobjcurr.addr_method = 'dhcp'
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if dhcp_v6:
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dhcp_running = True
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if 'inet6' not in ifaceobj.addr_family and not dhcp_v4:
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status = ifaceStatus.ERROR
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ifaceobjcurr.addr_method = 'dhcp'
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ifaceobjcurr.addr_family = ifaceobj.addr_family
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if not dhcp_running:
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ifaceobjcurr.addr_family = []
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status = ifaceStatus.ERROR
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ifaceobjcurr.status = status
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def _query_running(self, ifaceobjrunning):
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if not self.ipcmd.link_exists(ifaceobjrunning.name):
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return
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if self.dhclientcmd.is_running(ifaceobjrunning.name):
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ifaceobjrunning.addr_family.append('inet')
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ifaceobjrunning.addr_method = 'dhcp'
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if self.dhclientcmd.is_running6(ifaceobjrunning.name):
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ifaceobjrunning.addr_family.append('inet6')
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ifaceobjrunning.addr_method = 'dhcp6'
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_run_ops = {'up' : _up,
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'down' : _down,
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'pre-down' : _down,
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'query-checkcurr' : _query_check,
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'query-running' : _query_running }
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def get_ops(self):
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""" returns list of ops supported by this module """
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return self._run_ops.keys()
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def _init_command_handlers(self):
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if not self.ipcmd:
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self.ipcmd = iproute2()
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def run(self, ifaceobj, operation, query_ifaceobj=None, **extra_args):
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""" run dhcp configuration on the interface object passed as argument
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Args:
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**ifaceobj** (object): iface object
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**operation** (str): any of 'up', 'down', 'query-checkcurr',
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'query-running'
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Kwargs:
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**query_ifaceobj** (object): query check ifaceobject. This is only
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valid when op is 'query-checkcurr'. It is an object same as
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ifaceobj, but contains running attribute values and its config
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status. The modules can use it to return queried running state
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of interfaces. status is success if the running state is same
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as user required state in ifaceobj. error otherwise.
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"""
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op_handler = self._run_ops.get(operation)
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if not op_handler:
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return
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try:
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if (operation != 'query-running' and
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(ifaceobj.addr_method != 'dhcp' and
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ifaceobj.addr_method != 'dhcp6')):
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return
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except:
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return
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if not self.is_dhcp_allowed_on(ifaceobj, syntax_check=False):
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return
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self._init_command_handlers()
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if operation == 'query-checkcurr':
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op_handler(self, ifaceobj, query_ifaceobj)
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else:
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op_handler(self, ifaceobj)
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