+#
+# 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
+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
+ 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
+ def fdnode(self):
+ return self._fd_node
+
+ @property
+ 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
+ def tapnode(self):
+ return self.tap.node
+
+ @property
+ def node(self):
+ return self.tapnode
+
+ 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)
+
+ 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)
+
+ 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()
+
+ 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
+