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# SOCKSv5 proxy manager for network-sandbox
# Copyright 2015 Gentoo Foundation
# Distributed under the terms of the GNU General Public License v2
import os
import signal
from portage import _python_interpreter
from portage.data import portage_gid, portage_uid, userpriv_groups
from portage.process import atexit_register, spawn
class ProxyManager(object):
"""
A class to start and control a single running SOCKSv5 server process
for Portage.
"""
def __init__(self):
self.socket_path = None
self._pids = []
def start(self, settings):
"""
Start the SOCKSv5 server.
@param settings: Portage settings instance (used to determine
paths)
@type settings: portage.config
"""
try:
import asyncio # NOQA
except ImportError:
raise NotImplementedError('SOCKSv5 proxy requires asyncio module')
self.socket_path = os.path.join(settings['PORTAGE_TMPDIR'],
'.portage.%d.net.sock' % os.getpid())
server_bin = os.path.join(settings['PORTAGE_BIN_PATH'], 'socks5-server.py')
self._pids = spawn([_python_interpreter, server_bin, self.socket_path],
returnpid=True, uid=portage_uid, gid=portage_gid,
groups=userpriv_groups, umask=0o077)
def stop(self):
"""
Stop the SOCKSv5 server.
"""
for p in self._pids:
os.kill(p, signal.SIGINT)
os.waitpid(p, 0)
self.socket_path = None
self._pids = []
def is_running(self):
"""
Check whether the SOCKSv5 server is running.
@return: True if the server is running, False otherwise
"""
return self.socket_path is not None
proxy = ProxyManager()
def get_socks5_proxy(settings):
"""
Get UNIX socket path for a SOCKSv5 proxy. A new proxy is started if
one isn't running yet, and an atexit event is added to stop the proxy
on exit.
@param settings: Portage settings instance (used to determine paths)
@type settings: portage.config
@return: (string) UNIX socket path
"""
if not proxy.is_running():
proxy.start(settings)
atexit_register(proxy.stop)
return proxy.socket_path
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