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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 contextlib
import ipaddress
import os
from tasst import Tasst, TasstSubData
from tasst.address import IpiAllocator, TEST_NET_1
from tasst.nstool import UnshareSite
from tasst.site import Site
from tasst.typing import typecheck
class DhcpTasstInfo:
def __init__(self, site, ifname, addr, gw, mtu):
self.site = typecheck(site, Site)
self.ifname = typecheck(ifname, str)
self.addr = typecheck(addr, ipaddress.IPv4Address)
self.gw = typecheck(gw, ipaddress.IPv4Address)
self.mtu = typecheck(mtu, int)
site.require_cmds('ip')
class BaseDhcpTasst(Tasst):
"""
Test DHCP behaviour.
:avocado: disable
"""
DHCLIENT = '/sbin/dhclient'
def setup_dhcp(self):
raise NotImplementedError("{} must implement setup_dhcp() method".format(type(self).__name__))
@contextlib.contextmanager
def dhclient(self):
with self.setup_dhcp() as dti:
dti = typecheck(dti, DhcpTasstInfo)
dti.site.require_cmds(self.DHCLIENT, 'cat', 'kill')
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
dti.site.fg('{} -4 -v -nc -pf {} -lf {} {}'
.format(self.DHCLIENT, pidfile, leasefile, dti.ifname), sudo=True)
try:
yield dti
finally:
pid = int(dti.site.output('cat {}'.format(pidfile)))
dti.site.fg('kill {}'.format(pid))
def test_addr(self):
with self.dhclient() as dti:
(addr,) = dti.site.addrs(dti.ifname, family='inet', scope='global')
self.assertEquals(addr.ip, dti.addr)
def test_route(self):
with self.dhclient() as dti:
(defroute,) = dti.site.routes4(dst='default')
self.assertEquals(ipaddress.ip_address(defroute['gateway']), dti.gw)
def test_mtu(self):
with self.dhclient() as dti:
self.assertEquals(dti.site.mtu(dti.ifname), dti.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
@contextlib.contextmanager
def setup_dhcp(self):
ifname = 'clientif'
server_ifname = 'serverif'
with UnshareSite(type(self).__name__ + '.client', '-Un') as client, \
UnshareSite(type(self).__name__ + '.server', '-n',
parent=client, sudo=True) as server:
server.require_cmds(self.DHCPD)
client.veth(ifname, server_ifname, 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))
pidpath = os.path.join(self.workdir, 'dhcpd.pid')
leasepath = os.path.join(self.workdir, 'dhcpd.leases')
open(leasepath, 'w').write('')
server.ifup('lo')
server.ifup(server_ifname, server_ip4)
opts = ('-f -d -4 -cf {} -lf {} -pf {}'.format(confpath, leasepath, pidpath))
server.fg('{} -t {}'.format(self.DHCPD, opts)) # test config
with server.bg('{} {}'.format(self.DHCPD, opts), sudo=True) as dhcpd:
# Configure the client
client.ifup('lo')
yield DhcpTasstInfo(client, ifname, client_ip4.ip, server_ip4.ip, 1500)
pid = int(open(pidpath).read())
server.fg('kill {}'.format(pid))
status = dhcpd.wait()
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