src/nepi/resources/linux/udptunnel.py

   1 #
   2 #    NEPI, a framework to manage network experiments
   3 #    Copyright (C) 2013 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 from nepi.execution.attribute import Attribute, Flags, Types
  21 from nepi.execution.resource import clsinit_copy, ResourceState
  22 from nepi.resources.linux.tunnel import LinuxTunnel
  23 from nepi.util.sshfuncs import ProcStatus
  24 from nepi.util.timefuncs import tnow, tdiffsec
  25
  26 import os
  27 import socket
  28 import time
  29
  30 @clsinit_copy
  31 class LinuxUdpTunnel(LinuxTunnel):
  32     _rtype = "linux::UdpTunnel"
  33     _help = "Constructs a tunnel between two Linux endpoints using a UDP connection "
  34     _platform = "linux"
  35
  36     @classmethod
  37     def _register_attributes(cls):
  38         cipher = Attribute("cipher",
  39                "Cipher to encript communication. "
  40                 "One of PLAIN, AES, Blowfish, DES, DES3. ",
  41                 default = None,
  42                 allowed = ["PLAIN", "AES", "Blowfish", "DES", "DES3"],
  43                 type = Types.Enumerate,
  44                 flags = Flags.Design)
  45
  46         cipher_key = Attribute("cipherKey",
  47                 "Specify a symmetric encryption key with which to protect "
  48                 "packets across the tunnel. python-crypto must be installed "
  49                 "on the system." ,
  50                 flags = Flags.Design)
  51
  52         txqueuelen = Attribute("txQueueLen",
  53                 "Specifies the interface's transmission queue length. "
  54                 "Defaults to 1000. ",
  55                 type = Types.Integer,
  56                 flags = Flags.Design)
  57
  58         bwlimit = Attribute("bwLimit",
  59                 "Specifies the interface's emulated bandwidth in bytes "
  60                 "per second.",
  61                 type = Types.Integer,
  62                 flags = Flags.Design)
  63
  64         cls._register_attribute(cipher)
  65         cls._register_attribute(cipher_key)
  66         cls._register_attribute(txqueuelen)
  67         cls._register_attribute(bwlimit)
  68
  69     def __init__(self, ec, guid):
  70         super(LinuxUdpTunnel, self).__init__(ec, guid)
  71         self._home = "udp-tunnel-%s" % self.guid
  72         self._pids = dict()
  73
  74     def log_message(self, msg):
  75         return " guid %d - udptunnel %s - %s - %s " % (self.guid,
  76                 self.endpoint1.node.get("hostname"),
  77                 self.endpoint2.node.get("hostname"),
  78                 msg)
  79
  80     def get_endpoints(self):
  81         """ Returns the list of RM that are endpoints to the tunnel
  82         """
  83         connected = []
  84         for guid in self.connections:
  85             rm = self.ec.get_resource(guid)
  86             if hasattr(rm, "initiate_udp_connection"):
  87                 connected.append(rm)
  88         return connected
  89
  90     def initiate_connection(self, endpoint, remote_endpoint):
  91         cipher = self.get("cipher")
  92         cipher_key = self.get("cipherKey")
  93         bwlimit = self.get("bwLimit")
  94         txqueuelen = self.get("txQueueLen")
  95         connection_app_home = self.app_home(endpoint)
  96         connection_run_home = self.run_home(endpoint)
  97
  98         port = endpoint.initiate_udp_connection(
  99                 remote_endpoint,
 100                 connection_app_home,
 101                 connection_run_home,
 102                 cipher, cipher_key, bwlimit, txqueuelen)
 103
 104         return port
 105
 106     def establish_connection(self, endpoint, remote_endpoint, port):
 107         connection_app_home = self.app_home(endpoint)
 108         connection_run_home = self.run_home(endpoint)
 109
 110         endpoint.establish_udp_connection(remote_endpoint,
 111                 connection_app_home,
 112                 connection_run_home,
 113                 port)
 114
 115     def verify_connection(self, endpoint, remote_endpoint):
 116         connection_app_home = self.app_home(endpoint)
 117         connection_run_home = self.run_home(endpoint)
 118
 119         endpoint.verify_connection(remote_endpoint,
 120                 connection_app_home,
 121                 connection_run_home)
 122
 123     def terminate_connection(self, endpoint, remote_endpoint):
 124         connection_app_home = self.app_home(endpoint)
 125         connection_run_home = self.run_home(endpoint)
 126
 127         endpoint.terminate_connection(remote_endpoint,
 128                 connection_app_home,
 129                 connection_run_home)
 130
 131     def check_state_connection(self):
 132         # Make sure the process is still running in background
 133         # No execution errors occurred. Make sure the background
 134         # process with the recorded pid is still running.
 135
 136         status1 = self.endpoint1.check_status()
 137         status2 = self.endpoint2.check_status()
 138
 139         if status1 == ProcStatus.FINISHED and \
 140                 status2 == ProcStatus.FINISHED:
 141
 142             # check if execution errors occurred
 143             (out1, err1), proc1 = self.endpoint1.node.check_errors(
 144                     self.run_home(self.endpoint1))
 145
 146             (out2, err2), proc2 = self.endpoint2.node.check_errors(
 147                     self.run_home(self.endpoint2))
 148
 149             if err1 or err2:
 150                 msg = "Error occurred in tunnel"
 151                 self.error(msg, err1, err2)
 152                 self.fail()
 153             else:
 154                 self.set_stopped()
 155
 156