src/nepi/resources/linux/netns/netnsclient.py

   1 #
   2 #    NEPI, a framework to manage network experiments
   3 #    Copyright (C) 2014 INRIA
   4 #
   5 #    This program is free software: you can redistribute it and/or modify
   6 #    it under the terms of the GNU General Public License as published by
   7 #    the Free Software Foundation, either version 3 of the License, or
   8 #    (at your option) any later version.
   9 #
  10 #    This program is distributed in the hope that it will be useful,
  11 #    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 #    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13 #    GNU General Public License for more details.
  14 #
  15 #    You should have received a copy of the GNU General Public License
  16 #    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  17 #
  18 # Author: Alina Quereilhac <alina.quereilhac@inria.fr>
  19
  20 import base64
  21 import cPickle
  22 import errno
  23 import os
  24 import socket
  25 import time
  26 import weakref
  27
  28 from optparse import OptionParser, SUPPRESS_HELP
  29
  30 from nepi.resources.netns.netnsclient import NetNSClient
  31 from nepi.resources.netns.netnsserver import NetNSWrapperMessage
  32
  33 class LinuxNetNSClient(NetNSClient):
  34     def __init__(self, emulation):
  35         super(LinuxNetNSClient, self).__init__()
  36         self._emulation = weakref.ref(emulation)
  37
  38         self._socat_proc = None
  39
  40     @property
  41     def emulation(self):
  42         return self._emulation()
  43
  44     def send_msg(self, msg_type, *args, **kwargs):
  45         msg = [msg_type, args, kwargs]
  46
  47         def encode(item):
  48             item = cPickle.dumps(item)
  49             return base64.b64encode(item)
  50
  51         encoded = "|".join(map(encode, msg))
  52
  53         if self.emulation.node.get("hostname") in ['localhost', '127.0.0.1']:
  54             sock = socket.socket(socket.AF_UNIX, socket.SOCK_STREAM)
  55             sock.connect(self.emulation.remote_socket)
  56             sock.send("%s\n" % encoded)
  57             reply = sock.recv(1024)
  58             sock.close()
  59         else:
  60             command = ( "python -c 'import socket;"
  61                 "sock = socket.socket(socket.AF_UNIX, socket.SOCK_STREAM);"
  62                 "sock.connect(\"%(socket_addr)s\");"
  63                 "msg = \"%(encoded_message)s\\n\";"
  64                 "sock.send(msg);"
  65                 "reply = sock.recv(1024);"
  66                 "sock.close();"
  67                 "print reply'") % {
  68                     "encoded_message": encoded,
  69                     "socket_addr": self.emulation.remote_socket,
  70                     }
  71
  72             (reply, err), proc = self.emulation.node.execute(command,
  73                     with_lock = True)
  74
  75             if (err and proc.poll()) or reply.strip() == "":
  76                 msg = (" Couldn't connect to remote socket %s - REPLY: %s "
  77                       "- ERROR: %s ") % (
  78                         self.emulation.remote_socket, reply, err)
  79                 self.emulation.error(msg, reply, err)
  80                 raise RuntimeError(msg)
  81
  82         reply = cPickle.loads(base64.b64decode(reply))
  83
  84         return reply
  85
  86     def create(self, *args, **kwargs):
  87         return self.send_msg(NetNSWrapperMessage.CREATE, *args, **kwargs)
  88
  89     def invoke(self, *args, **kwargs):
  90         return self.send_msg(NetNSWrapperMessage.INVOKE, *args, **kwargs)
  91
  92     def set(self, *args, **kwargs):
  93         return self.send_msg(NetNSWrapperMessage.SET, *args, **kwargs)
  94
  95     def get(self, *args, **kwargs):
  96         return self.send_msg(NetNSWrapperMessage.GET, *args, **kwargs)
  97
  98     def flush(self, *args, **kwargs):
  99         return self.send_msg(NetNSWrapperMessage.FLUSH, *args, **kwargs)
 100
 101     def shutdown(self, *args, **kwargs):
 102         try:
 103             return self.send_msg(NetNSWrapperMessage.SHUTDOWN, *args, **kwargs)
 104         except:
 105             pass
 106
 107         return None
 108