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#
# Blackbox tests of netplan's keyfile parser that verify that the generated
# YAML files look as expected. These are run during "make check" and
# don't touch the system configuration at all.
#
# Copyright (C) 2021 Canonical, Ltd.
# Author: Lukas Märdian <slyon@ubuntu.com>
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; version 3.
#
# This program 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 General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
from configparser import ConfigParser
from netplan.libnetplan import _GError
import os
import sys
import shutil
import tempfile
import unittest
import ctypes
import ctypes.util
import contextlib
import subprocess
exe_generate = os.path.join(os.path.dirname(os.path.dirname(
os.path.dirname(os.path.abspath(__file__)))), 'generate')
# make sure we point to libnetplan properly.
os.environ.update({'LD_LIBRARY_PATH': '.:{}'.format(os.environ.get('LD_LIBRARY_PATH'))})
# make sure we fail on criticals
os.environ['G_DEBUG'] = 'fatal-criticals'
lib = ctypes.CDLL(ctypes.util.find_library('netplan'))
# A contextmanager to catch the output on a low level so that it catches output
# from a subprocess or C library call, in addition to normal python output
@contextlib.contextmanager
def capture_stderr():
stderr_fd = 2 # 2 = stderr
with tempfile.NamedTemporaryFile(mode='w+b') as tmp:
stderr_copy = os.dup(stderr_fd)
try:
sys.stderr.flush()
os.dup2(tmp.fileno(), stderr_fd)
yield tmp
finally:
sys.stderr.flush()
os.dup2(stderr_copy, stderr_fd)
os.close(stderr_copy)
class TestKeyfileBase(unittest.TestCase):
def setUp(self):
self.workdir = tempfile.TemporaryDirectory()
self.confdir = os.path.join(self.workdir.name, 'etc', 'netplan')
self.maxDiff = None
os.makedirs(self.confdir)
def tearDown(self):
lib.netplan_clear_netdefs()
shutil.rmtree(self.workdir.name)
super().tearDown()
def generate_from_keyfile(self, keyfile, netdef_id=None, expect_fail=False, filename=None):
'''Call libnetplan with given keyfile string as configuration'''
err = ctypes.POINTER(_GError)()
# Autodetect default 'NM-<UUID>' netdef-id
ssid = ''
if not netdef_id:
found_values = 0
uuid = 'UNKNOWN_UUID'
for line in keyfile.splitlines():
if line.startswith('uuid='):
uuid = line.split('=')[1]
found_values += 1
elif line.startswith('ssid='):
ssid += '-' + line.split('=')[1]
found_values += 1
if found_values >= 2:
break
netdef_id = 'NM-' + uuid
generated_file = 'netplan-{}{}.nmconnection'.format(netdef_id, ssid)
original_file = filename or generated_file
f = os.path.join(self.workdir.name,
'run/NetworkManager/system-connections/{}'.format(original_file))
os.makedirs(os.path.dirname(f))
# Create the original keyfile that will be parsed by netplan
with open(f, 'w') as file:
file.write(keyfile)
with capture_stderr() as outf:
if expect_fail:
self.assertFalse(lib.netplan_parse_keyfile(f.encode(), ctypes.byref(err)))
if err:
return err.contents.message.decode('utf-8')
else:
self.assertTrue(lib.netplan_parse_keyfile(f.encode(), ctypes.byref(err)))
if err: # pragma: nocover (only happens if a test fails so irrelevant for coverage)
return err.contents.message.decode('utf-8')
# If the original file does not have a standard netplan-*.nmconnection
# filename it is being deleted in favor of the newly generated file.
# It has been parsed and is not needed anymore in this case
if generated_file != original_file:
os.remove(f)
lib._write_netplan_conf(netdef_id.encode(), self.workdir.name.encode())
lib.netplan_clear_netdefs()
# check re-generated keyfile
self.assert_nm_regenerate({generated_file: keyfile})
with open(outf.name, 'r') as f:
output = f.read().strip() # output from stderr (fd=2) on C/library level
return output
def assert_netplan(self, file_contents_map):
for uuid in file_contents_map.keys():
self.assertTrue(os.path.isfile(os.path.join(self.confdir, '90-NM-{}.yaml'.format(uuid))))
with open(os.path.join(self.confdir, '90-NM-{}.yaml'.format(uuid)), 'r') as f:
self.assertEqual(f.read(), file_contents_map[uuid])
def normalize_keyfile(self, file_contents):
parser = ConfigParser()
parser.read_string(file_contents)
sections = parser.sections()
res = []
# Sort sections and keys
sections.sort()
for s in sections:
items = parser.items(s)
if s == 'ipv6' and len(items) == 1 and items[0] == ('method', 'ignore'):
continue
line = '\n[' + s + ']'
res.append(line)
items.sort(key=lambda tup: tup[0])
for k, v in items:
# Normalize lines
if k == 'addr-gen-mode':
v = v.replace('1', 'stable-privacy').replace('0', 'eui64')
elif k == 'ip6-privacy' and v == '0':
continue
elif k == 'wake-on-lan' and v == '1':
continue
elif k == 'stp' and v == 'true':
continue
elif k.startswith('route'):
v = v.replace(',::', ',').replace(',0.0.0.0', ',')
v = v.strip(',')
line = (k + '=' + v).strip(';')
res.append(line)
return '\n'.join(res).strip()+'\n'
def assert_nm_regenerate(self, file_contents_map):
argv = [exe_generate, '--root-dir', self.workdir.name]
p = subprocess.Popen(argv, stdout=subprocess.PIPE,
stderr=subprocess.PIPE, universal_newlines=True)
returncode = p.wait(5)
(out, err) = p.communicate()
self.assertEqual(returncode, 0, err)
self.assertEqual(out, '')
con_dir = os.path.join(self.workdir.name, 'run', 'NetworkManager', 'system-connections')
if file_contents_map:
self.assertEqual(set(os.listdir(con_dir)),
set([n for n in file_contents_map]))
for fname, contents in file_contents_map.items():
with open(os.path.join(con_dir, fname)) as f:
generated_keyfile = self.normalize_keyfile(f.read())
normalized_contents = self.normalize_keyfile(contents)
self.assertEqual(generated_keyfile, normalized_contents,
'Re-generated keyfile does not match')
else: # pragma: nocover (only needed for test debugging)
if os.path.exists(con_dir):
self.assertEqual(os.listdir(con_dir), [])
return err
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