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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 jinja2
from vyos.ifconfig.control import Control
template_v4 = """
# generated by ifconfig.py
option rfc3442-classless-static-routes code 121 = array of unsigned integer 8;
timeout 60;
retry 300;
interface "{{ intf }}" {
send host-name "{{ hostname }}";
{% if client_id -%}
send dhcp-client-identifier "{{ client_id }}";
{% endif -%}
{% if vendor_class_id -%}
send vendor-class-identifier "{{ vendor_class_id }}";
{% endif -%}
request subnet-mask, broadcast-address, routers, domain-name-servers,
rfc3442-classless-static-routes, domain-name, interface-mtu;
require subnet-mask;
}
"""
template_v6 = """
# generated by ifconfig.py
interface "{{ intf }}" {
request routers, domain-name-servers, domain-name;
}
"""
class DHCP (Control):
client_base = r'/var/lib/dhcp/dhclient_'
def __init__ (self, ifname):
# per interface DHCP config files
self._dhcp = {
4: {
'ifname': ifname,
'conf': self.client_base + ifname + '.conf',
'pid': self.client_base + ifname + '.pid',
'lease': self.client_base + ifname + '.leases',
'options': {
'intf': ifname,
'hostname': '',
'client_id': '',
'vendor_class_id': ''
},
},
6: {
'ifname': ifname,
'conf': self.client_base + ifname + '.v6conf',
'pid': self.client_base + ifname + '.v6pid',
'lease': self.client_base + ifname + '.v6leases',
'accept_ra': f'/proc/sys/net/ipv6/conf/{ifname}/accept_ra',
'options': {
'intf': ifname,
'dhcpv6_prm_only': False,
'dhcpv6_temporary': False
},
},
}
def get_dhcp_options(self):
"""
Return dictionary with supported DHCP options.
Dictionary should be altered and send back via set_dhcp_options()
so those options are applied when DHCP is run.
"""
return self._dhcp[4]['options']
def set_dhcp_options(self, options):
"""
Store new DHCP options used by next run of DHCP client.
"""
self._dhcp[4]['options'] = options
def get_dhcpv6_options(self):
"""
Return dictionary with supported DHCPv6 options.
Dictionary should be altered and send back via set_dhcp_options()
so those options are applied when DHCP is run.
"""
return self._dhcp[6]['options']
def set_dhcpv6_options(self, options):
"""
Store new DHCP options used by next run of DHCP client.
"""
self._dhcp[6]['options'] = options
# replace dhcpv4/v6 with systemd.networkd?
def _set_dhcp(self):
"""
Configure interface as DHCP client. The dhclient binary is automatically
started in background!
Example:
>>> from vyos.ifconfig import Interface
>>> j = Interface('eth0')
>>> j.set_dhcp()
"""
dhcp = self.get_dhcp_options()
if not dhcp['hostname']:
# read configured system hostname.
# maybe change to vyos hostd client ???
with open('/etc/hostname', 'r') as f:
dhcp['hostname'] = f.read().rstrip('\n')
# render DHCP configuration
tmpl = jinja2.Template(template_v4)
dhcp_text = tmpl.render(dhcp)
with open(self._dhcp[4]['conf'], 'w') as f:
f.write(dhcp_text)
cmd = 'start-stop-daemon'
cmd += ' --start'
cmd += ' --oknodo'
cmd += ' --quiet'
cmd += ' --pidfile {pid}'
cmd += ' --exec /sbin/dhclient'
cmd += ' --'
# now pass arguments to dhclient binary
cmd += ' -4 -nw -cf {conf} -pf {pid} -lf {lease} {ifname}'
return self._cmd(cmd.format(**self._dhcp[4]))
def _del_dhcp(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.del_dhcp()
"""
if not os.path.isfile(self._dhcp[4]['pid']):
self._debug_msg('No DHCP client PID found')
return None
# with open(self._dhcp[4]['pid'], 'r') as f:
# pid = int(f.read())
# stop dhclient, we need to call dhclient and tell it should release the
# aquired IP address. tcpdump tells me:
# 172.16.35.103.68 > 172.16.35.254.67: [bad udp cksum 0xa0cb -> 0xb943!] BOOTP/DHCP, Request from 00:50:56:9d:11:df, length 300, xid 0x620e6946, Flags [none] (0x0000)
# Client-IP 172.16.35.103
# Client-Ethernet-Address 00:50:56:9d:11:df
# Vendor-rfc1048 Extensions
# Magic Cookie 0x63825363
# DHCP-Message Option 53, length 1: Release
# Server-ID Option 54, length 4: 172.16.35.254
# Hostname Option 12, length 10: "vyos"
#
cmd = '/sbin/dhclient -cf {conf} -pf {pid} -lf {lease} -r {ifname}'
self._cmd(cmd.format(**self._dhcp[4]))
# cleanup old config files
for name in ('conf', 'pid', 'lease'):
if os.path.isfile(self._dhcp[4][name]):
os.remove(self._dhcp[4][name])
def _set_dhcpv6(self):
"""
Configure interface as DHCPv6 client. The dhclient binary is automatically
started in background!
Example:
>>> from vyos.ifconfig import Interface
>>> j = Interface('eth0')
>>> j.set_dhcpv6()
"""
dhcpv6 = self.get_dhcpv6_options()
# better save then sorry .. should be checked in interface script
# but if you missed it we are safe!
if dhcpv6['dhcpv6_prm_only'] and dhcpv6['dhcpv6_temporary']:
raise Exception(
'DHCPv6 temporary and parameters-only options are mutually exclusive!')
# render DHCP configuration
tmpl = jinja2.Template(template_v6)
dhcpv6_text = tmpl.render(dhcpv6)
with open(self._dhcp[6]['conf'], 'w') as f:
f.write(dhcpv6_text)
# no longer accept router announcements on this interface
self._write_sysfs(self._dhcp[6]['accept_ra'], 0)
# assemble command-line to start DHCPv6 client (dhclient)
cmd = 'start-stop-daemon'
cmd += ' --start'
cmd += ' --oknodo'
cmd += ' --quiet'
cmd += ' --pidfile {pid}'
cmd += ' --exec /sbin/dhclient'
cmd += ' --'
# now pass arguments to dhclient binary
cmd += ' -6 -nw -cf {conf} -pf {pid} -lf {lease}'
# add optional arguments
if dhcpv6['dhcpv6_prm_only']:
cmd += ' -S'
if dhcpv6['dhcpv6_temporary']:
cmd += ' -T'
cmd += ' {ifname}'
return self._cmd(cmd.format(**self._dhcp[6]))
def _del_dhcpv6(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.del_dhcpv6()
"""
if not os.path.isfile(self._dhcp[6]['pid']):
self._debug_msg('No DHCPv6 client PID found')
return None
# with open(self._dhcp[6]['pid'], 'r') as f:
# pid = int(f.read())
# stop dhclient
cmd = 'start-stop-daemon'
cmd += ' --start'
cmd += ' --oknodo'
cmd += ' --quiet'
cmd += ' --pidfile {pid}'
self._cmd(cmd.format(**self._dhcp[6]))
# accept router announcements on this interface
self._write_sysfs(self._dhcp[6]['accept_ra'], 1)
# cleanup old config files
for name in ('conf', 'pid', 'lease'):
if os.path.isfile(self._dhcp[6][name]):
os.remove(self._dhcp[6][name])
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