Commit a885a2a8 authored by Antoine Millet's avatar Antoine Millet

Added VpnProtocol.

parent 9659bfe9
......@@ -82,5 +82,6 @@ class Protocol(object):
from sjrpc.core.protocols.rpc import RpcProtocol
from sjrpc.core.protocols.tunnel import TunnelProtocol
from sjrpc.core.protocols.vpn import VpnProtocol
__all__ = ['Protocol', 'RpcProtocol', 'TunnelProtocol']
__all__ = ['Protocol', 'RpcProtocol', 'TunnelProtocol', 'VpnProtocol']
from __future__ import absolute_import
import os
import struct
import fcntl
from sjrpc.core.protocols import TunnelProtocol
__all__ = ['VpnProtocol']
class _FileSocket(object):
'''
A fake Socket interface for files.
'''
def __init__(self, file_):
self.file = file_
def recv(self, size):
self.file.read(size)
def send(self, data):
self.file.write(data)
return len(data)
def fileno(self):
return self.file.fileno()
def setblocking(self, blocking):
if not blocking:
# Disable blocking mode on devzero:
current_flags = fcntl.fcntl(self.fileno(), fcntl.F_GETFL)
fcntl.fcntl(self.fileno(), fcntl.F_SETFL, current_flags | os.O_NONBLOCK)
else:
raise NotImplementedError('Not implemented')
class VpnProtocol(TunnelProtocol):
'''
A VPN protocol which spawn a network interface and tunnel all its traffic
through the sjRpc tunnel.
:param inherited: All options (except endpoint) are inherited from
:class:`TunnelProtocol`.
:param tun_prefix: the prefix name of the spawned interface
:param tun_mode: which can be VpnProtocol.IFF_TUN or VpnProtocol.IFF_TAP
The user starting the sjRpc process must have the CAP_NET_ADMIN capability,
by default, only root have this capability.
.. warning::
This protocol is a proof of concept and should not be used in production
software.
'''
# Taken from linux/if_tun.h:
TUNSETIFF = 0x400454ca
IFF_TUN = 0x0001
IFF_TAP = 0x0002
# Default values:
DEFAULT_TUN_PREFIX = 'tun'
DEFAULT_TUN_MODE = IFF_TAP
def __init__(self, *args, **kwargs):
tun_prefix = kwargs.pop('tun_prefix', VpnProtocol.DEFAULT_TUN_PREFIX)
tun_mode = kwargs.pop('tun_mode', VpnProtocol.DEFAULT_TUN_MODE)
ftun = open('/dev/net/tun', 'r+b')
# Create the tunnel and get its final name:
create_tun_arg = struct.pack('16sH', tun_prefix + '%d', tun_mode)
tun = fcntl.ioctl(ftun, VpnProtocol.TUNSETIFF, create_tun_arg)
self.tun_name = tun[:16].rstrip('\0')
kwargs['endpoint'] = _FileSocket(ftun)
super(VpnProtocol, self).__init__(*args, **kwargs)
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