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# SPDX-License-Identifier: GPL-2.0
from .utils import ip
import ctypes
import random
import string
libc = ctypes.cdll.LoadLibrary('libc.so.6')
class NetNS:
def __init__(self, name=None):
if name:
self.name = name
else:
self.name = ''.join(random.choice(string.ascii_lowercase) for _ in range(8))
ip('netns add ' + self.name)
def __del__(self):
if self.name:
ip('netns del ' + self.name)
self.name = None
def __enter__(self):
return self
def __exit__(self, ex_type, ex_value, ex_tb):
self.__del__()
def __str__(self):
return self.name
def __repr__(self):
return f"NetNS({self.name})"
class NetNSEnter:
def __init__(self, ns_name):
self.ns_path = f"/run/netns/{ns_name}"
def __enter__(self):
self.saved = open("/proc/thread-self/ns/net")
with open(self.ns_path) as ns_file:
libc.setns(ns_file.fileno(), 0)
return self
def __exit__(self, exc_type, exc_value, traceback):
libc.setns(self.saved.fileno(), 0)
self.saved.close()
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