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# Copyright 2020 VyOS maintainers and contributors <maintainers@vyos.io>
#
# This library is free software; you can redistribute it and/or
# modify it under the terms of the GNU Lesser General Public
# License as published by the Free Software Foundation; either
# version 2.1 of the License, or (at your option) any later version.
#
# This library is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public
# License along with this library. If not, see <http://www.gnu.org/licenses/>.
import os
import jmespath
from vyos.configdict import dict_merge
from vyos.configverify import verify_dhcpv6
from vyos.ifconfig.control import Control
from vyos.template import render
class _DHCPv4 (Control):
def __init__(self, ifname):
super().__init__()
config_base = r'/var/lib/dhcp/dhclient'
self._conf_file = f'{config_base}_{ifname}.conf'
self._options_file = f'{config_base}_{ifname}.options'
self._pid_file = f'{config_base}_{ifname}.pid'
self._lease_file = f'{config_base}_{ifname}.leases'
self.options = {'ifname' : ifname}
# replace dhcpv4/v6 with systemd.networkd?
def set(self):
"""
Configure interface as DHCP client. The dhclient binary is automatically
started in background!
Example:
>>> from vyos.ifconfig import Interface
>>> j = Interface('eth0')
>>> j.dhcp.v4.set()
"""
if jmespath.search('dhcp_options.host_name', self.options) == None:
# read configured system hostname.
# maybe change to vyos hostd client ???
hostname = 'vyos'
with open('/etc/hostname', 'r') as f:
hostname = f.read().rstrip('\n')
tmp = {'dhcp_options' : { 'host_name' : hostname}}
self.options = dict_merge(tmp, self.options)
render(self._options_file, 'dhcp-client/daemon-options.tmpl',
self.options, trim_blocks=True)
render(self._conf_file, 'dhcp-client/ipv4.tmpl',
self.options, trim_blocks=True)
return self._cmd('systemctl restart dhclient@{ifname}.service'.format(**self.options))
def delete(self):
"""
De-configure interface as DHCP clinet. All auto generated files like
pid, config and lease will be removed.
Example:
>>> from vyos.ifconfig import Interface
>>> j = Interface('eth0')
>>> j.dhcp.v4.delete()
"""
if not os.path.isfile(self._pid_file):
self._debug_msg('No DHCP client PID found')
return None
self._cmd('systemctl stop dhclient@{ifname}.service'.format(**self.options))
# cleanup old config files
for file in [self._conf_file, self._options_file, self._pid_file, self._lease_file]:
if os.path.isfile(file):
os.remove(file)
class _DHCPv6 (Control):
def __init__(self, ifname):
super().__init__()
self.options = {'ifname' : ifname}
self._config = f'/run/dhcp6c/dhcp6c.{ifname}.conf'
def set(self):
"""
Configure interface as DHCPv6 client. The client is automatically
started in background when address is configured as DHCP.
Example:
>>> from vyos.ifconfig import Interface
>>> j = Interface('eth0')
>>> j.dhcp.v6.set()
"""
# better save then sorry .. should be checked in interface script but if you
# missed it we are safe!
verify_dhcpv6(self.options)
render(self._config, 'dhcp-client/ipv6.tmpl',
self.options, trim_blocks=True)
# We must ignore any return codes. This is required to enable DHCPv6-PD
# for interfaces which are yet not up and running.
return self._popen('systemctl restart dhcp6c@{ifname}.service'.format(
**self.options))
def delete(self):
"""
De-configure interface as DHCPv6 client. All auto generated files like
pid, config and lease will be removed.
Example:
>>> from vyos.ifconfig import Interface
>>> j = Interface('eth0')
>>> j.dhcp.v6.delete()
"""
self._cmd('systemctl stop dhcp6c@{ifname}.service'.format(**self.options))
# cleanup old config files
if os.path.isfile(self._config):
os.remove(self._config)
class DHCP(object):
def __init__(self, ifname):
self.v4 = _DHCPv4(ifname)
self.v6 = _DHCPv6(ifname)
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