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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/nstool.py - Run commands in namespaces via 'nstool'
#
# Copyright Red Hat
# Author: David Gibson <david@gibson.dropbear.id.au>
import os
import sys
import tempfile
import avocado
from avocado.utils.process import CmdError
from tasst import Tasst
from tasst.site import BaseSiteTasst, Site, REAL_HOST
# FIXME: Can this be made more portable?
UNIX_PATH_MAX = 108
class NsToolSite(Site):
NST_BIN = './test/nstool'
def __init__(self, name, sockpath):
super().__init__(name)
if len(sockpath) > UNIX_PATH_MAX:
raise ValueError('Unix domain socket path \"{}\" is too long'.format(sockpath))
self.sockpath = sockpath
self._pid = int(REAL_HOST.output('{} info -wp {}'.format(self.NST_BIN, sockpath), timeout=1))
print('NsToolSite: sockpath={} PID={}'.format(sockpath, self.pid()), file=sys.stderr)
# PID of the nstool hold process as seen by the test host
def pid(self):
return self._pid
# PID of the nstool hold process as seen by another site
# (important when using PID namespaces)
def relative_pid(self, relative_to):
cmd = '{} info -p {}'.format(self.NST_BIN, self.sockpath)
return int(relative_to.output(cmd))
def _nst_cmd(self, cmd, sudo=False):
nst_args = self.sockpath
if sudo:
nst_args = '--keep-caps ' + nst_args
return '{} exec {} -- {}'.format(self.NST_BIN, nst_args, cmd)
def output(self, cmd, sudo=False, **kwargs):
return REAL_HOST.output(self._nst_cmd(cmd, sudo), **kwargs)
def fg(self, cmd, sudo=False, **kwargs):
return REAL_HOST.fg(self._nst_cmd(cmd, sudo), **kwargs)
def bg(self, cmd, sudo=False, **kwargs):
return REAL_HOST.bg(self._nst_cmd(cmd, sudo), **kwargs)
# Create path for temporary nstool Unix socket
#
# The obvious choice would be to use Avocado's workdir, but that often
# gives paths that are too long for Unix sockets
def temp_sockpath(name):
tmpd = tempfile.mkdtemp(suffix=name)
return os.path.join(tmpd, 's')
class UnshareSite(NsToolSite):
def __init__(self, name, unshare_opts, parent=REAL_HOST, sudo=False):
sockpath = temp_sockpath(name)
parent.require_cmds('unshare', self.NST_BIN)
self.parent = parent
holdcmd = 'unshare {} -- {} hold {}'.format(unshare_opts, self.NST_BIN, sockpath)
self.holder = parent.bg(holdcmd, sudo=sudo)
super().__init__(name, sockpath)
def close(self):
try:
self.parent.fg('{} stop {}'.format(self.NST_BIN, self.sockpath))
except CmdError:
pass
try:
self.holder.stop()
finally:
try:
os.remove(self.sockpath)
except FileNotFoundError:
pass
os.rmdir(os.path.dirname(self.sockpath))
super().close()
class IsolatedNetTasst(BaseSiteTasst):
"""
Test a site with isolated network
:avocado: disable
:avocado: tags=meta
"""
def subsetup(self, site):
Tasst.subsetup(self, IsolatedNetTasst, site)
BaseSiteTasst.subsetup(self, site)
def test_isolated_net(self):
site = self.get_subsetup(IsolatedNetTasst)
self.assertEquals(site.ifs(), ['lo'])
class UserNetNsTasst(IsolatedNetTasst):
"""
Test creating a userns+netns together
:avocado: tags=meta
"""
def setUp(self):
super().setUp()
self.ns = UnshareSite(type(self).__name__, '-Ucn')
IsolatedNetTasst.subsetup(self, self.ns)
def tearDown(self):
self.ns.close()
super().tearDown()
def test_userns(self):
REAL_HOST.require_cmds('capsh')
self.ns.require_cmds('capsh')
capcmd = 'capsh --has-p=CAP_SETUID'
self.assertRaises(CmdError, REAL_HOST.fg, capcmd)
self.ns.fg(capcmd, sudo=True)
class NestedNsTasst(IsolatedNetTasst):
"""
Test creating userns with a netns nested within
:avocado: tags=meta
"""
def setUp(self):
super().setUp()
self.userns = UnshareSite(type(self).__name__ + '.userns', '-Uc')
self.netns = UnshareSite(type(self).__name__ + '.netns', '-n',
parent=self.userns, sudo=True)
IsolatedNetTasst.subsetup(self, self.netns)
def tearDown(self):
self.netns.close()
self.userns.close()
super().tearDown()
class PidNsTasst(IsolatedNetTasst):
"""
Test unsing unshare -p to create a pidns
:avocado: tags=meta
"""
def setUp(self):
super().setUp()
self.pidns = UnshareSite(type(self).__name__, '-Upfn')
IsolatedNetTasst.subsetup(self, self.pidns)
def tearDown(self):
self.pidns.close()
super().tearDown()
def test_relative_pid(self):
# The holder is init (pid 1) within its own pidns
self.assertEquals(self.pidns.relative_pid(self.pidns), 1)
class ConnectNsToolTasst(BaseSiteTasst):
"""
Test connecting to a pre-existing nstool
:avocado: tags=meta
"""
def setUp(self):
super().setUp()
self.sockpath = temp_sockpath(type(self).__name__)
holdcmd = '{} hold {}'.format(NsToolSite.NST_BIN, self.sockpath)
self.holder = REAL_HOST.bg(holdcmd)
BaseSiteTasst.subsetup(self, NsToolSite("fake ns", self.sockpath))
def tearDown(self):
try:
self.holder.stop()
finally:
try:
os.remove(self.sockpath)
except FileNotFoundError:
pass
os.rmdir(os.path.dirname(self.sockpath))
super().tearDown()
|