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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 contextlib
import os
import sys
import tempfile
import avocado
from avocado.utils.process import CmdError
from tasst import Tasst
from tasst.site import IsolatedSiteTasst, SiteTasst, Site, REAL_HOST
from tasst.typing import typecheck
# FIXME: Can this be made more portable?
UNIX_PATH_MAX = 108
class NsToolSite(Site):
NST_BIN = './test/nstool'
def __init__(self, name, sockpath):
if len(sockpath) > UNIX_PATH_MAX:
raise ValueError('Unix domain socket path \"{}\" is too long'.format(sockpath))
super().__init__(name)
self.sockpath = sockpath
def __enter__(self):
self._pid = int(REAL_HOST.output('{} info -wp {}'.format(self.NST_BIN, self.sockpath), timeout=1))
return self
def __exit__(self, *exc_details):
pass
# 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)
def veth(self, ifname, peername, peer=None):
self.fg('ip link add {} type veth peer name {}'.format(ifname, peername),
sudo=True)
if peer is not None:
if not isinstance(peer, NsToolSite):
raise TypeError
self.fg('ip link set {} netns {}'.format(peername,
peer.relative_pid(self)),
sudo=True)
# 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)
super().__init__(name, sockpath)
self.parent = typecheck(parent, Site)
self.holdcmd = 'unshare {} -- {} hold {}'.format(unshare_opts,
self.NST_BIN, sockpath)
self.sudo = typecheck(sudo, bool)
def __enter__(self):
self.holder = self.parent.bg(self.holdcmd, sudo=self.sudo)
self.holder.__enter__()
return super().__enter__()
def __exit__(self, *exc_details):
super().__exit__(*exc_details)
try:
self.parent.fg('{} stop {}'.format(self.NST_BIN, self.sockpath))
finally:
self.holder.__exit__(*exc_details)
try:
os.remove(self.sockpath)
except FileNotFoundError:
pass
os.rmdir(os.path.dirname(self.sockpath))
class UserNetNsTasst(IsolatedSiteTasst):
"""
Test creating a userns+netns together
:avocado: tags=meta
"""
@contextlib.contextmanager
def setup_site(self):
with UnshareSite(type(self).__name__, '-Ucn') as ns:
ns.ifup('lo')
yield ns
def test_userns(self):
REAL_HOST.require_cmds('capsh')
with self.setup_site() as ns:
ns.require_cmds('capsh')
capcmd = 'capsh --has-p=CAP_SETUID'
self.assertRaises(CmdError, REAL_HOST.fg, capcmd)
ns.fg(capcmd, sudo=True)
class NestedNsTasst(IsolatedSiteTasst):
"""
Test creating userns with a netns nested within
:avocado: tags=meta
"""
@contextlib.contextmanager
def setup_site(self):
name = type(self).__name__
with UnshareSite(name + '.userns', '-Uc') as userns:
with UnshareSite(name + '.netns', '-n', parent=userns, sudo=True) as netns:
netns.ifup('lo')
yield netns
class PidNsTasst(IsolatedSiteTasst):
"""
Test unsing unshare -p to create a pidns
:avocado: tags=meta
"""
@contextlib.contextmanager
def setup_site(self):
with UnshareSite(type(self).__name__, '-Upfn') as ns:
ns.ifup('lo')
yield ns
def test_relative_pid(self):
with self.setup_site() as site:
# The holder is init (pid 1) within its own pidns
self.assertEquals(site.relative_pid(site), 1)
class ConnectNsToolTasst(SiteTasst):
"""
Test connecting to a pre-existing nstool
:avocado: tags=meta
"""
@contextlib.contextmanager
def setup_site(self):
sockpath = temp_sockpath(type(self).__name__)
holdcmd = '{} hold {}'.format(NsToolSite.NST_BIN, sockpath)
with REAL_HOST.bg(holdcmd) as holder:
with NsToolSite("fake ns", sockpath) as site:
yield site
try:
os.remove(sockpath)
finally:
os.rmdir(os.path.dirname(sockpath))
|