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| | #! /usr/bin/python3
# SPDX-License-Identifier: GPL-2.0-or-later
#
# tasst - Test A Simple Socket Transport
# library of test helpers for passt & pasta
#
# tasst/dhcp.py - Helpers for testing DHCP
#
# Copyright Red Hat
# Author: David Gibson <david@gibson.dropbear.id.au>
import ipaddress
import os
from tasst import Tasst, TasstSubData
from tasst.address import IpiAllocator, TEST_NET_1
from tasst.nstool import UnshareSite
class BaseDhcpTasst(Tasst):
"""
Test DHCP behaviour.
:avocado: disable
"""
DHCLIENT = '/sbin/dhclient'
def subsetup(self, site, ifname, addr, gw, mtu):
site.require_cmds(self.DHCLIENT)
pidfile = os.path.join(self.workdir, 'dhclient.pid')
leasefile = os.path.join(self.workdir, 'dhclient.leases')
# We need '-nc' because we may be running with capabilities
# but not UID 0. Without -nc dhclient drops capabilities
# before invoking dhclient-script, so it's unable to actually
# configure the interface
site.fg('{} -4 -v -nc -pf {} -lf {} {}'
.format(self.DHCLIENT, pidfile, leasefile, ifname), sudo=True)
Tasst.subsetup(self, BaseDhcpTasst,
TasstSubData(site=site, ifname=ifname, addr=addr, gw=gw, mtu=mtu))
def test_addr(self):
sub = self.get_subsetup(BaseDhcpTasst)
(addr,) = sub.site.addrs(sub.ifname, family='inet', scope='global')
self.assertEquals(addr.ip, sub.addr)
def test_route(self):
sub = self.get_subsetup(BaseDhcpTasst)
(defroute,) = sub.site.routes4(dst='default')
self.assertEquals(ipaddress.ip_address(defroute['gateway']), sub.gw)
def test_mtu(self):
sub = self.get_subsetup(BaseDhcpTasst)
self.assertEquals(sub.site.mtu(sub.ifname), sub.mtu)
class MetaDhcpTasst(BaseDhcpTasst):
"""Ugly workaround for
https://github.com/avocado-framework/avocado/issues/5680.
Explicitly apply the "meta" tag to inherited tests
:avocado: disable
:avocado: tags=meta
"""
def test_addr(self):
super().test_addr()
def test_route(self):
super().test_route()
def test_mtu(self):
super().test_mtu()
class DhcpdTasst(MetaDhcpTasst):
DHCPD = 'dhcpd'
SUBNET = TEST_NET_1
def setUp(self):
super().setUp()
ifname = 'clientif'
server_ifname = 'serverif'
self.client = UnshareSite(self.__class__.__name__ + '.client', '-Un')
self.server = UnshareSite(self.__class__.__name__ + '.server', '-n',
parent=self.client, sudo=True)
self.server.require_cmds(self.DHCPD)
self.client.veth(ifname, server_ifname, self.server)
# Configure the DHCP server
ipa = IpiAllocator(self.SUBNET)
(server_ip4,) = ipa.next_ipis()
(client_ip4,) = ipa.next_ipis()
confpath = os.path.join(self.workdir, 'dhcpd.conf')
open(confpath, 'w').write('''
subnet {} netmask {} {{
option routers {};
range {} {};
}}
'''.format(self.SUBNET.network_address, self.SUBNET.netmask,
server_ip4.ip, client_ip4.ip, client_ip4.ip))
self.pidpath = os.path.join(self.workdir, 'dhcpd.pid')
leasepath = os.path.join(self.workdir, 'dhcpd.leases')
open(leasepath, 'w').write('')
self.server.ifup('lo')
self.server.ifup(server_ifname, server_ip4)
opts = ('-f -d -4 -cf {} -lf {} -pf {}'.format(confpath, leasepath, self.pidpath))
self.server.fg('{} -t {}'.format(self.DHCPD, opts)) # test config
self.dhcpd = self.server.bg('{} {}'.format(self.DHCPD, opts), sudo=True)
# Configure the client
self.client.ifup('lo')
BaseDhcpTasst.subsetup(self, self.client, ifname, client_ip4.ip, server_ip4.ip, 1500)
def tearDown(self):
pid = int(open(self.pidpath).read())
self.server.fg('kill {}'.format(pid))
status = self.dhcpd.wait()
self.server.close()
self.client.close()
super().tearDown()
|