netflowfu¶ ↑

NetflowFu a netflow v5/v9 library for Ruby that sits on top of PacketFu. It permits to easily develop both netflow collectors and netflow exporters.

Note

Please keep in mind that this software is in alpha development stage. At present time only collector is tested and there are some missing featues.

Installation¶ ↑

# git clone git://github.com/dguerri/netflowfu.git
# bundle install
# rake install

Usage¶ ↑

Receiving data from an exporter (with eventmachine)¶ ↑

require 'netflowfu'
require 'eventmachine'

class NetflowCallbacks

  def netflow5_callback(packet)
    # Put code to handle netflow 5 flows here
    puts "netflow5 flows received"
    packet.flows.each { |x| puts x.humanize + "\n" }
  end

  def netflow9_callback(packet)
    # Put code to handle netflow 9 flows here
    puts "netflow9 decoded_flowset received"
    packet.data_flowsets.each { |x| puts x.humanize }
  end

end

module Collector

  def post_init
    @collector = NetflowCollector.new(:netflow_callbacks => NetflowCallbacks.new)
  end

  def receive_data(data)
    puts "Data received"
    @collector.receive(data)
  end
end

EventMachine::run { EventMachine::open_datagram_socket("0.0.0.0", 9999, Collector) }

Extracting data from a pcap file (e.g. for benchmarking)¶ ↑

class NetflowCallbacks

  def netflow5_callback(packet)
    # Put code to handle netflow 5 flows here
    puts "netflow5 flows received"
    packet.flows.each { |x| puts x.humanize + "\n" }
  end

  def netflow9_callback(packet)
    # Put code to handle netflow 9 flows here
    puts "netflow9 decoded_flowset received"
    packet.data_flowsets.each { |x| puts x.humanize }
  end

end

def do_the_job(file)
  file = File.open(file) { |f| f.read }

  collector = NetflowCollector.new(:netflow_callbacks => NetflowCallbacks.new)

  pcap_file = PacketFu::PcapPackets.new
  pcap_file.read(file)
  i=0
  start_t = Time.now
  pcap_file.each do |p|
    # Now it's a PacketFu packet struct.
    pkt = PacketFu::Packet.parse(p.data)
    begin
      if pkt.udp_dst == 9999
        collector.receive(pkt.payload)
        i+=1
      end
    rescue Exception => e
      puts "#{e}\n#{e.backtrace}"
    end
  end
  stop_t = Time.now

  fps = i / (stop_t - start_t)
  puts "Flow per seconds = #{fps}"
end

do_the_job("./netflow-pcap-file.pcap")

Contributing to netflowfu¶ ↑

• Check out the latest master to make sure the feature hasn’t been implemented or the bug hasn’t been fixed yet

• Check out the issue tracker to make sure someone already hasn’t requested it and/or contributed it

• Fork the project

• Start a feature/bugfix branch

• Commit and push until you are happy with your contribution

• Make sure to add tests for it. This is important so I don’t break it in a future version unintentionally.

• Please try not to mess with the Rakefile, version, or history. If you want to have your own version, or is otherwise necessary, that is fine, but please isolate to its own commit so I can cherry-pick around it.

Copyright¶ ↑

Copyright © 2011 Davide Guerri. See LICENSE.txt for further details.