#!/usr/bin/env python
#
# NEPI, a framework to manage network experiments
# Copyright (C) 2013 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 .
#
# Author: Lucia Guevgeozian
# Alina Quereilhac
#
#
# Example of how to run this experiment (replace with your information):
#
# $ cd
# python examples/linux/netcat_file_transfer.py -a -b -u -i
from __future__ import print_function
from nepi.execution.ec import ExperimentController
from nepi.execution.resource import ResourceAction, ResourceState
from optparse import OptionParser, SUPPRESS_HELP
import os
usage = ("usage: %prog -a -b -u -i ")
parser = OptionParser(usage = usage)
parser.add_option("-a", "--hostname1", dest="hostname1",
help="Remote host 1", type="str")
parser.add_option("-b", "--hostname2", dest="hostname2",
help="Remote host 2", type="str")
parser.add_option("-u", "--username", dest="username",
help="Username to SSH to remote host", type="str")
parser.add_option("-i", "--ssh-key", dest="ssh_key",
help="Path to private SSH key to be used for connection",
type="str")
(options, args) = parser.parse_args()
hostname1 = options.hostname1
hostname2 = options.hostname2
username = options.username
ssh_key = options.ssh_key
## Create the experiment controller
ec = ExperimentController(exp_id = "nc_file_transfer")
## Register node 1
node1 = ec.register_resource("linux::Node")
# Set the hostname of the first node to use for the experiment
ec.set(node1, "hostname", hostname1)
# username should be your SSH user
ec.set(node1, "username", username)
# Absolute path to the SSH private key
ec.set(node1, "identity", ssh_key)
# Clean all files, results, etc, from previous experiments wit the same exp_id
ec.set(node1, "cleanExperiment", True)
# Kill all running processes in the node before running the experiment
ec.set(node1, "cleanProcesses", True)
## Register node 2
node2 = ec.register_resource("linux::Node")
# Set the hostname of the first node to use for the experiment
ec.set(node2, "hostname", hostname2)
# username should be your SSH user
ec.set(node2, "username", username)
# Absolute path to the SSH private key
ec.set(node2, "identity", ssh_key)
# Clean all files, results, etc, from previous experiments wit the same exp_id
ec.set(node2, "cleanExperiment", True)
# Kill all running processes in the node before running the experiment
ec.set(node2, "cleanProcesses", True)
# Register server
video = "big_buck_bunny_240p_mpeg4_lq.ts"
local_path_to_video = os.path.join(
os.path.dirname(os.path.realpath(__file__)),
"..", video)
command = "cat ${SHARE}/%s | pv -fbt 2> bw.txt | nc %s 1234" % (
video, hostname2 )
server = ec.register_resource("linux::Application")
ec.set(server, "depends", "pv nc tcpdump")
ec.set(server, "files", local_path_to_video)
ec.set(server, "command", command)
ec.register_connection(server, node1)
# Register client
# Note: is important to add the -d option in nc command to not attempt to read from the
# stdin
# if not nc in the client side close the socket suddently if runned in background
command = "nc -dl 1234 > %s" % video
client = ec.register_resource("linux::Application")
ec.set(client, "depends", "nc")
ec.set(client, "command", command)
ec.register_connection(client, node2)
# Register a tcpdump in the server node to monitor the file transfer
command = "tcpdump -ni eth0 -w file_transfer.pcap -s0 port 1234 2>&1"
capture = ec.register_resource("linux::Application")
ec.set(capture, "depends", "tcpdump")
ec.set(capture, "command", command)
ec.set(capture, "sudo", True)
ec.register_connection(capture, node1)
# Register conditions 1. nodes ; 2. start tcpdump capture ; 3. client listen port 1234 ;
# 4. server start sending video
ec.register_condition(server, ResourceAction.START, client, ResourceState.STARTED)
ec.register_condition(client, ResourceAction.START, capture, ResourceState.STARTED)
# Deploy
ec.deploy()
# Wait until the applications are finish to retrive the traces
ec.wait_finished([server, client])
# Retrieve traces from nc and tcpdump
bw = ec.trace(server, "bw.txt")
pcap = ec.trace(capture, "file_transfer.pcap")
# Choose a directory to store the traces, example f = open("/home//bw.txt", "w")
with open("bw.txt", "w") as f:
f.write(bw)
with open("video_transfer.pcap", "w") as f:
f.write(pcap)
ec.shutdown()
print("Total bytes transfered saved to bw.txt...")