Source code for nepi.resources.linux.ns3.tuntapfdlink
#
# NEPI, a framework to manage network experiments
# Copyright (C) 2014 INRIA
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License version 2 as
# published by the Free Software Foundation;
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
#
# Author: Alina Quereilhac <alina.quereilhac@inria.fr>
from nepi.execution.resource import ResourceState, clsinit_copy
from nepi.resources.linux.application import LinuxApplication
import base64
import fcntl
import os
import socket
import struct
@clsinit_copy
[docs]class LinuxTunTapFdLink(LinuxApplication):
""" Interconnects a TAP or TUN Linux device to a FdNetDevice
"""
_rtype = "linux::ns3::TunTapFdLink"
def __init__(self, ec, guid):
super(LinuxTunTapFdLink, self).__init__(ec, guid)
self._tap = None
self._fdnetdevice = None
self._fd_node = None
self.send_address = None
self._home = "tuntap-link-%s" % self.guid
@property
[docs] def fdnetdevice(self):
if not self._fdnetdevice:
from nepi.resources.ns3.ns3fdnetdevice import NS3BaseFdNetDevice
devices = self.get_connected(NS3BaseFdNetDevice.get_rtype())
if not devices or len(devices) != 1:
msg = "TunTapFdLink must be connected to exactly one FdNetDevice"
self.error(msg)
raise RuntimeError, msg
self._fdnetdevice = devices[0]
simu = self._fdnetdevice.simulation
from nepi.resources.linux.node import LinuxNode
nodes = simu.get_connected(LinuxNode.get_rtype())
self._fd_node = nodes[0]
return self._fdnetdevice
@property
[docs] def fdnode(self):
return self._fd_node
@property
[docs] def tap(self):
if not self._tap:
from nepi.resources.linux.tap import LinuxTap
devices = self.get_connected(LinuxTap.get_rtype())
if not devices or len(devices) != 1:
msg = "TunTapLink must be connected to exactly one Tap or Tun"
self.error(msg)
raise RuntimeError, msg
self._tap = devices[0]
return self._tap
@property
[docs] def tapnode(self):
return self.tap.node
@property
[docs] def node(self):
return self.tapnode
[docs] def upload_sources(self):
scripts = []
# vif-passfd python script
linux_passfd = os.path.join(os.path.dirname(__file__),
"..",
"scripts",
"linux-tap-passfd.py")
scripts.append(linux_passfd)
# Upload scripts
scripts = ";".join(scripts)
self.node.upload(scripts,
os.path.join(self.node.src_dir),
overwrite = False)
[docs] def upload_start_command(self):
if self.tapnode.get("hostname") != \
self.fdnode.get("hostname"):
msg = "Tap and FdNetDevice are not in the same host"
self.error(msg)
raise RuntimeError, msg
self.send_address = self.fdnetdevice.recv_fd()
self.set("command", self._start_command)
command = self.get("command")
shfile = os.path.join(self.app_home, "start.sh")
self.node.run_and_wait(command, self.run_home,
shfile=shfile,
wait_run=False,
overwrite=True)
[docs] def do_deploy(self):
if self.tap.state < ResourceState.READY or \
self.fdnetdevice.state < ResourceState.READY:
self.debug("---- RESCHEDULING DEPLOY ---- ")
self.ec.schedule(self.reschedule_delay, self.deploy)
else:
self.do_discover()
self.do_provision()
self.set_ready()
[docs] def do_start(self):
if self.state == ResourceState.READY:
command = self.get("command")
self.info("Starting command '%s'" % command)
self.set_started()
else:
msg = " Failed to execute command '%s'" % command
self.error(msg, out, err)
raise RuntimeError, msg
@property
def _start_command(self):
address = base64.b64encode(self.send_address)
command = []
# Use tap-passfd.py to send fd from TAP to FdNetDevice
command.append("sudo -S")
command.append("PYTHONPATH=$PYTHONPATH:${SRC}")
command.append("python ${SRC}/linux-tap-passfd.py")
command.append("-a %s" % address)
command.append("-S %s " % self.tap.sock_name)
command = " ".join(command)
command = self.replace_paths(command)
return command