Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
1# SPDX-License-Identifier: GPL-2.0
2
3from .utils import ip
4import ctypes
5import random
6import string
7
8libc = ctypes.cdll.LoadLibrary('libc.so.6')
9
10
11class NetNS:
12 def __init__(self, name=None):
13 if name:
14 self.name = name
15 else:
16 self.name = ''.join(random.choice(string.ascii_lowercase) for _ in range(8))
17 ip('netns add ' + self.name)
18
19 def __del__(self):
20 if self.name:
21 ip('netns del ' + self.name)
22 self.name = None
23
24 def __enter__(self):
25 return self
26
27 def __exit__(self, ex_type, ex_value, ex_tb):
28 self.__del__()
29
30 def __str__(self):
31 return self.name
32
33 def __repr__(self):
34 return f"NetNS({self.name})"
35
36
37class NetNSEnter:
38 def __init__(self, ns_name):
39 self.ns_path = f"/run/netns/{ns_name}"
40
41 def __enter__(self):
42 self.saved = open("/proc/thread-self/ns/net")
43 with open(self.ns_path) as ns_file:
44 libc.setns(ns_file.fileno(), 0)
45 return self
46
47 def __exit__(self, exc_type, exc_value, traceback):
48 libc.setns(self.saved.fileno(), 0)
49 self.saved.close()