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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 *
try:
from pyroute2 import netns
from pyroute2 import IPRoute
netlink = True
except ImportError:
netlink = False
print("!!! Consider installing pyroute2 !!!")
class SubPlugin(TdcPlugin):
def __init__(self):
self.sub_class = 'ns/SubPlugin'
super().__init__()
def pre_suite(self, testcount, testlist):
super().pre_suite(testcount, testlist)
def prepare_test(self, test):
if 'skip' in test and test['skip'] == 'yes':
return
if 'nsPlugin' not in test['plugins']:
return
if netlink == True:
self._nl_ns_create()
else:
self._ipr2_ns_create()
# Make sure the netns is visible in the fs
ticks = 20
while True:
if ticks == 0:
raise TimeoutError
self._proc_check()
try:
ns = self.args.NAMES['NS']
f = open('/run/netns/{}'.format(ns))
f.close()
break
except:
time.sleep(0.1)
ticks -= 1
continue
def pre_case(self, test, test_skip):
if self.args.verbose:
print('{}.pre_case'.format(self.sub_class))
if test_skip:
return
self.prepare_test(test)
def post_case(self):
if self.args.verbose:
print('{}.post_case'.format(self.sub_class))
if netlink == True:
self._nl_ns_destroy()
else:
self._ipr2_ns_destroy()
def post_suite(self, index):
if self.args.verbose:
print('{}.post_suite'.format(self.sub_class))
# Make sure we don't leak resources
cmd = self._replace_keywords("$IP -a netns del")
if self.args.verbose > 3:
print('_exec_cmd: command "{}"'.format(cmd))
subprocess.run(cmd, shell=True, stdout=subprocess.DEVNULL, stderr=subprocess.DEVNULL)
def adjust_command(self, stage, command):
super().adjust_command(stage, command)
cmdform = 'list'
cmdlist = list()
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 _nl_ns_create(self):
ns = self.args.NAMES["NS"];
dev0 = self.args.NAMES["DEV0"];
dev1 = self.args.NAMES["DEV1"];
dummy = self.args.NAMES["DUMMY"];
if self.args.verbose:
print('{}._nl_ns_create'.format(self.sub_class))
netns.create(ns)
netns.pushns(newns=ns)
with IPRoute() as ip:
ip.link('add', ifname=dev1, kind='veth', peer={'ifname': dev0, 'net_ns_fd':'/proc/1/ns/net'})
ip.link('add', ifname=dummy, kind='dummy')
ticks = 20
while True:
if ticks == 0:
raise TimeoutError
try:
dev1_idx = ip.link_lookup(ifname=dev1)[0]
dummy_idx = ip.link_lookup(ifname=dummy)[0]
ip.link('set', index=dev1_idx, state='up')
ip.link('set', index=dummy_idx, state='up')
break
except:
time.sleep(0.1)
ticks -= 1
continue
netns.popns()
with IPRoute() as ip:
ticks = 20
while True:
if ticks == 0:
raise TimeoutError
try:
dev0_idx = ip.link_lookup(ifname=dev0)[0]
ip.link('set', index=dev0_idx, state='up')
break
except:
time.sleep(0.1)
ticks -= 1
continue
def _ipr2_ns_create_cmds(self):
cmds = []
ns = self.args.NAMES['NS']
cmds.append(self._replace_keywords('netns add {}'.format(ns)))
cmds.append(self._replace_keywords('link add $DEV1 type veth peer name $DEV0'))
cmds.append(self._replace_keywords('link set $DEV1 netns {}'.format(ns)))
cmds.append(self._replace_keywords('link add $DUMMY type dummy'.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)))
cmds.append(self._replace_keywords('link set $DEV0 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 $DEV2 up'.format(ns)))
return cmds
def _ipr2_ns_create(self):
'''
Create the network namespace in which the tests will be run and set up
the required network devices for it.
'''
self._exec_cmd_batched('pre', self._ipr2_ns_create_cmds())
def _nl_ns_destroy(self):
ns = self.args.NAMES['NS']
netns.remove(ns)
def _ipr2_ns_destroy_cmd(self):
return self._replace_keywords('netns delete {}'.format(self.args.NAMES['NS']))
def _ipr2_ns_destroy(self):
'''
Destroy the network namespace for testing (and any associated network
devices as well)
'''
self._exec_cmd('post', self._ipr2_ns_destroy_cmd())
@cached_property
def _proc(self):
ip = self._replace_keywords("$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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