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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
from vyos.dicts import FixedDict
from vyos.ifconfig.control import Control
from vyos.template import render
config_base = r'/var/lib/dhcp/dhclient_'
class _DHCPv4 (Control):
def __init__(self, ifname):
super().__init__()
self.options = FixedDict(**{
'ifname': ifname,
'hostname': '',
'client_id': '',
'vendor_class_id': '',
'conf_file': config_base + f'{ifname}.conf',
'options_file': config_base + f'{ifname}.options',
'pid_file': config_base + f'{ifname}.pid',
'lease_file': config_base + f'{ifname}.leases',
})
# 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 not self.options['hostname']:
# read configured system hostname.
# maybe change to vyos hostd client ???
with open('/etc/hostname', 'r') as f:
self.options['hostname'] = f.read().rstrip('\n')
render(self.options['options_file'], 'dhcp-client/daemon-options.tmpl', self.options)
render(self.options['conf_file'], 'dhcp-client/ipv4.tmpl', self.options)
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.options['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 name in ('conf_file', 'options_file', 'pid_file', 'lease_file'):
if os.path.isfile(self.options[name]):
os.remove(self.options[name])
class _DHCPv6 (Control):
def __init__(self, ifname):
super().__init__()
self.options = FixedDict(**{
'ifname': ifname,
'conf_file': config_base + f'v6_{ifname}.conf',
'options_file': config_base + f'v6_{ifname}.options',
'pid_file': config_base + f'v6_{ifname}.pid',
'lease_file': config_base + f'v6_{ifname}.leases',
'dhcpv6_prm_only': False,
'dhcpv6_temporary': False,
})
def set(self):
"""
Configure interface as DHCPv6 client. The dhclient binary is automatically
started in background!
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!
if self.options['dhcpv6_prm_only'] and self.options['dhcpv6_temporary']:
raise Exception(
'DHCPv6 temporary and parameters-only options are mutually exclusive!')
render(self.options['options_file'], 'dhcp-client/daemon-options.tmpl', self.options)
render(self.options['conf_file'], 'dhcp-client/ipv6.tmpl', self.options)
# no longer accept router announcements on this interface
self._write_sysfs('/proc/sys/net/ipv6/conf/{ifname}/accept_ra'.format(**self.options), 0)
return self._cmd('systemctl restart dhclient6@{ifname}.service'.format(**self.options))
def delete(self):
"""
De-configure interface as DHCPv6 clinet. 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()
"""
if not os.path.isfile(self.options['pid_file']):
self._debug_msg('No DHCPv6 client PID found')
return None
self._cmd('systemctl stop dhclient6@{ifname}.service'.format(**self.options))
# accept router announcements on this interface
self._write_sysfs('/proc/sys/net/ipv6/conf/{ifname}/accept_ra'.format(**self.options), 1)
# cleanup old config files
for name in ('conf_file', 'options_file', 'pid_file', 'lease_file'):
if os.path.isfile(self.options[name]):
os.remove(self.options[name])
class DHCP(object):
def __init__(self, ifname):
self.v4 = _DHCPv4(ifname)
self.v6 = _DHCPv6(ifname)
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