1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
|
import os
import signal
from string import Template
import subprocess
import time
from functools import cached_property
from TdcPlugin import TdcPlugin
from tdc_config import *
class SubPlugin(TdcPlugin):
def __init__(self):
self.sub_class = 'ns/SubPlugin'
super().__init__()
def pre_suite(self, testcount, testlist):
super().pre_suite(testcount, testlist)
print("Setting up namespaces and devices...")
original = self.args.NAMES
for t in testlist:
if 'skip' in t and t['skip'] == 'yes':
continue
if 'nsPlugin' not in t['plugins']:
continue
shadow = {}
shadow['IP'] = original['IP']
shadow['TC'] = original['TC']
shadow['NS'] = '{}-{}'.format(original['NS'], t['random'])
shadow['DEV0'] = '{}id{}'.format(original['DEV0'], t['id'])
shadow['DEV1'] = '{}id{}'.format(original['DEV1'], t['id'])
shadow['DUMMY'] = '{}id{}'.format(original['DUMMY'], t['id'])
shadow['DEV2'] = original['DEV2']
self.args.NAMES = shadow
if self.args.namespace:
self._ns_create()
else:
self._ports_create()
self.args.NAMES = original
def pre_case(self, caseinfo, test_skip):
if self.args.verbose:
print('{}.pre_case'.format(self.sub_class))
if test_skip:
return
# Make sure the netns is visible in the fs
while True:
self._proc_check()
try:
ns = self.args.NAMES['NS']
f = open('/run/netns/{}'.format(ns))
f.close()
break
except:
continue
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
|
