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import os
import signal
from string import Template
import subprocess
import time
from multiprocessing import Pool
from functools import cached_property
from TdcPlugin import TdcPlugin
from tdc_config import *
def prepare_suite(obj, test):
original = obj.args.NAMES
if 'skip' in test and test['skip'] == 'yes':
return
if 'nsPlugin' not in test['plugins']:
return
shadow = {}
shadow['IP'] = original['IP']
shadow['TC'] = original['TC']
shadow['NS'] = '{}-{}'.format(original['NS'], test['random'])
shadow['DEV0'] = '{}id{}'.format(original['DEV0'], test['id'])
shadow['DEV1'] = '{}id{}'.format(original['DEV1'], test['id'])
shadow['DUMMY'] = '{}id{}'.format(original['DUMMY'], test['id'])
shadow['DEV2'] = original['DEV2']
obj.args.NAMES = shadow
if obj.args.namespace:
obj._ns_create()
else:
obj._ports_create()
# Make sure the netns is visible in the fs
while True:
obj._proc_check()
try:
ns = obj.args.NAMES['NS']
f = open('/run/netns/{}'.format(ns))
f.close()
break
except:
time.sleep(0.1)
continue
obj.args.NAMES = original
class SubPlugin(TdcPlugin):
def __init__(self):
self.sub_class = 'ns/SubPlugin'
super().__init__()
def pre_suite(self, testcount, testlist):
from itertools import cycle
super().pre_suite(testcount, testlist)
print("Setting up namespaces and devices...")
with Pool(self.args.mp) as p:
it = zip(cycle([self]), testlist)
p.starmap(prepare_suite, it)
def pre_case(self, caseinfo, test_skip):
if self.args.verbose:
print('{}.pre_case'.format(self.sub_class))
if test_skip:
return
def post_case(self):
if self.args.verbose:
print('{}.post_case'.format(self.sub_class))
if self.args.namespace:
self._ns_destroy()
else:
self._ports_destroy()
def post_suite(self, index):
if self.args.verbose:
print('{}.post_suite'.format(self.sub_class))
# Make sure we don't leak resources
for f in os.listdir('/run/netns/'):
cmd = self._replace_keywords("$IP netns del {}".format(f))
if self.args.verbose > 3:
print('_exec_cmd: command "{}"'.format(cmd))
subprocess.run(cmd, shell=True, stdout=subprocess.DEVNULL, stderr=subprocess.DEVNULL)
def add_args(self, parser):
super().add_args(parser)
self.argparser_group = self.argparser.add_argument_group(
'netns',
'options for nsPlugin(run commands in net namespace)')
self.argparser_group.add_argument(
'-N', '--no-namespace', action='store_false', default=True,
dest='namespace', help='Don\'t run commands in namespace')
return self.argparser
def adjust_command(self, stage, command):
super().adjust_command(stage, command)
cmdform = 'list'
cmdlist = list()
if not self.args.namespace:
return command
if self.args.verbose:
print('{}.adjust_command'.format(self.sub_class))
if not isinstance(command, list):
cmdform = 'str'
cmdlist = command.split()
else:
cmdlist = command
if stage == 'setup' or stage == 'execute' or stage == 'verify' or stage == 'teardown':
if self.args.verbose:
print('adjust_command: stage is {}; inserting netns stuff in command [{}] list [{}]'.format(stage, command, cmdlist))
cmdlist.insert(0, self.args.NAMES['NS'])
cmdlist.insert(0, 'exec')
cmdlist.insert(0, 'netns')
cmdlist.insert(0, self.args.NAMES['IP'])
else:
pass
if cmdform == 'str':
command = ' '.join(cmdlist)
else:
command = cmdlist
if self.args.verbose:
print('adjust_command: return command [{}]'.format(command))
return command
def _ports_create_cmds(self):
cmds = []
cmds.append(self._replace_keywords('link add $DEV0 type veth peer name $DEV1'))
cmds.append(self._replace_keywords('link set $DEV0 up'))
cmds.append(self._replace_keywords('link add $DUMMY type dummy'))
if not self.args.namespace:
cmds.append(self._replace_keywords('link set $DEV1 up'))
return cmds
def _ports_create(self):
self._exec_cmd_batched('pre', self._ports_create_cmds())
def _ports_destroy_cmd(self):
return self._replace_keywords('link del $DEV0')
def _ports_destroy(self):
self._exec_cmd('post', self._ports_destroy_cmd())
def _ns_create_cmds(self):
cmds = []
if self.args.namespace:
ns = self.args.NAMES['NS']
cmds.append(self._replace_keywords('netns add {}'.format(ns)))
cmds.append(self._replace_keywords('link set $DEV1 netns {}'.format(ns)))
cmds.append(self._replace_keywords('link set $DUMMY netns {}'.format(ns)))
cmds.append(self._replace_keywords('netns exec {} $IP link set $DEV1 up'.format(ns)))
cmds.append(self._replace_keywords('netns exec {} $IP link set $DUMMY up'.format(ns)))
if self.args.device:
cmds.append(self._replace_keywords('link set $DEV2 netns {}'.format(ns)))
cmds.append(self._replace_keywords('netns exec {} $IP link set $DEV2 up'.format(ns)))
return cmds
def _ns_create(self):
'''
Create the network namespace in which the tests will be run and set up
the required network devices for it.
'''
self._ports_create()
self._exec_cmd_batched('pre', self._ns_create_cmds())
def _ns_destroy_cmd(self):
return self._replace_keywords('netns delete {}'.format(self.args.NAMES['NS']))
def _ns_destroy(self):
'''
Destroy the network namespace for testing (and any associated network
devices as well)
'''
if self.args.namespace:
self._exec_cmd('post', self._ns_destroy_cmd())
self._ports_destroy()
@cached_property
def _proc(self):
ip = self._replace_keywords("$IP -b -")
proc = subprocess.Popen(ip,
shell=True,
stdin=subprocess.PIPE,
env=ENVIR)
return proc
def _proc_check(self):
proc = self._proc
proc.poll()
if proc.returncode is not None and proc.returncode != 0:
raise RuntimeError("iproute2 exited with an error code")
def _exec_cmd(self, stage, command):
'''
Perform any required modifications on an executable command, then run
it in a subprocess and return the results.
'''
if self.args.verbose > 3:
print('_exec_cmd: command "{}"'.format(command))
proc = self._proc
proc.stdin.write((command + '\n').encode())
proc.stdin.flush()
if self.args.verbose > 3:
print('_exec_cmd proc: {}'.format(proc))
self._proc_check()
def _exec_cmd_batched(self, stage, commands):
for cmd in commands:
self._exec_cmd(stage, cmd)
def _replace_keywords(self, cmd):
"""
For a given executable command, substitute any known
variables contained within NAMES with the correct values
"""
tcmd = Template(cmd)
subcmd = tcmd.safe_substitute(self.args.NAMES)
return subcmd
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