Class: Rbkb::Cli::Feed

Inherits:
Executable show all
Defined in:
lib/rbkb/cli/feed.rb

Overview

Copyright 2009 emonti at moatasano dot com See README.rdoc for license information

This is a plug-board message feeder from static data sources. The “feed” handles messages opaquely and just plays them in the given sequence.

Feed can do the following things with minimum fuss: 

- Import messages from files, yaml, or pcap
- Inject custom/modified messages with "blit"
- Run as a server or client using UDP or TCP
- Bootstrap protocols without a lot of work up front
- Skip uninteresting messages and focus attention on the fun ones.
- Replay conversations for relatively unfamiliar protocols.
- Observe client/server behaviors using different messages at
  various phases of a conversation.

To-dos / Ideas:

- Unix Domain Socket support?
- more import options?
- dynamic feed elements?
- add/control feed elements while 'stepping'?

Instance Attribute Summary

Attributes inherited from Executable

#argv, #exit_status, #oparse, #opts, #stderr, #stdin, #stdout

Instance Method Summary collapse

Methods inherited from Executable

#bail, #bail_args, #exit, run

Constructor Details

#initialize(*args) ⇒ Feed

Returns a new instance of Feed.



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# File 'lib/rbkb/cli/feed.rb', line 31

def initialize(*args)
  @local_addr = "0.0.0.0"
  @local_port = nil
  @listen = false
  @persist = false
  @transport = :TCP
  @svr_method = :start_server
  @cli_method = :connect
  @blit_addr = Plug::Blit::DEFAULT_IPADDR
  @blit_port = Plug::Blit::DEFAULT_PORT


  ## Default options sent to the Feed handler
  @feed_opts = { 
    :close_at_end => false,
    :step => false,
    :go_first => false
  }

  super(*args)

  # TODO Plug::UI obviously need fixing. 
  # TODO It shouldn't be driven by constants for configuration
  Plug::UI::LOGCFG[:verbose] = true
  Plug::UI::LOGCFG[:dump] = :hex
  Plug::UI::LOGCFG[:out] = @stderr
end

Instance Method Details

#go(*args) ⇒ Object 



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# File 'lib/rbkb/cli/feed.rb', line 196

def go(*args)
  super(*args)

  Plug::UI.verbose "** FEED CONTAINS #{@feed_opts[:feed].size} MESSAGES"

  ## Start the eventmachine
  loop do
    EventMachine::run do
      EventMachine.send(*@em_args) do |c|
        EventMachine.start_server(@blit_addr, @blit_port, Plug::Blit, :TCP, c)
        Plug::UI::verbose("** BLITSRV-#{@blit_addr}:#{@blit_port}(TCP) Started")

        # if this is a UDP client, we will always send the first message
        if [:UDP, :client] == [@transport, c.kind]
          peer = c.peers.add_peer_manually(@target_addr, @target_port)
          c.feed_data(peer)
          c.go_first = false
        end
      end
    end

    break unless @persist
    Plug::UI::verbose("** RECONNECTING")
  end

end

#make_parser ⇒ Object 



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# File 'lib/rbkb/cli/feed.rb', line 59

def make_parser()
  arg = super()
  arg.banner += " host:port"

  arg.on("-o", "--output=FILE", "Output to file") do |o|
    Plug::UI::LOGCFG[:out] = File.open(o, "w")
  end

  arg.on("-l", "--listen=(ADDR:?)PORT", "Server - on port (and addr?)") do |p|
    if m=/^(?:([\w\._-]+):)?(\d+)$/.match(p)
      @local_addr = $1 if $1
      @local_port = $2.to_i
      @listen = true
    else
      raise "Invalid listen argument: #{p.inspect}"
    end
  end

  arg.on("-b", "--blit=(ADDR:)?PORT", "Where to listen for blit") do |b|
    puts b
    unless(m=/^(?:([\w\._-]+):)?(\d+)$/.match(b))
      raise "Invalid blit argument: #{b.inspect}"
    end
    @blit_port = m[2].to_i
    @blit_addr = m[1] if m[1]
  end

  arg.on("-i", "--[no-]initiate", "Send the first message on connect") do |i|
    @feed_opts[:go_first] = i
  end

  arg.on("-e", "--[no-]end", "End connection when feed is exhausted") do |c|
    @feed_opts[:close_at_end] = c
  end
   
  arg.on("-s", "--[no-]step", "'Continue' prompt between messages") do |s|
    @feed_opts[:step] = s
  end

  arg.on("-u", "--udp", "Use UDP instead of TCP" ) do
    @transport = :UDP
  end

  arg.on("-r", "--reconnect", "Attempt to reconnect endlessly.") do
    @persist=true
  end

  arg.on("-q", "--quiet", "Suppress verbose messages/dumps") do
    Plug::UI::LOGCFG[:verbose] = false
  end

  arg.on("-Q", "--squelch-exhausted", "Squelch 'FEED EXHAUSTED' messages") do |s|
    @feed_opts[:squelch_exhausted] = true
  end

  arg.separator  "  Sources: (can be combined)"

  arg.on("-f", "--from-files=GLOB", "Import messages from raw files") do |f|
    @feed_opts[:feed] ||= []
    @feed_opts[:feed] += FeedImport.import_rawfiles(f)
  end

  arg.on("-x", "--from-hex=FILE", "Import messages from hexdumps") do |x|
    @feed_opts[:feed] ||= []
    @feed_opts[:feed] += FeedImport.import_dump(x)
  end

  arg.on("-y", "--from-yaml=FILE", "Import messages from yaml") do |y|
    @feed_opts[:feed] ||= []
    @feed_opts[:feed] += FeedImport.import_yaml(y)
  end

  arg.on("-p", "--from-pcap=FILE[:FILTER]", "Import messages from pcap") do |p|
    if /^([^:]+):(.+)$/.match(p)
      file = $1
      filter = $2
    else
      file = p
      filter = nil
    end

    @feed_opts[:feed] ||= []
    @feed_opts[:feed] += FeedImport.import_pcap(file, filter)
  end
end

#parse(*args) ⇒ Object 



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# File 'lib/rbkb/cli/feed.rb', line 145

def parse(*args)
  super(*args)

  if @transport == :UDP
    @svr_method = @cli_method = :open_datagram_socket
  end

  # Prepare EventMachine arguments based on whether we are a client or server
  if @listen
    @evma_addr = @local_addr
    @evma_port = @local_port
    @meth = @svr_method
    @feed_opts[:kind] = :server
    @feed_opts[:no_stop_on_unbind] = true
  else

    ## Get target/listen argument for client mode
    unless (m = /^([\w\.]+):(\d+)$/.match(tgt=@argv.shift))
      bail_args tgt
    end

    @target_addr = m[1]
    @target_port = m[2].to_i

    if @transport == :UDP
      @evma_addr = @local_addr
      @evma_port = @local_port || 0
    else
      @evma_addr = @target_addr
      @evma_port = @target_port
    end

    @meth = @cli_method
    @feed_opts[:kind] = :client
  end

  @feed_opts[:feed] ||= []

  @em_args=[ 
    @meth, 
    @evma_addr, 
    @evma_port, 
    Plug::ArrayFeeder, 
    @transport, 
    @feed_opts
  ].flatten

  parse_catchall()
end