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http sniffing Ruby

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Sniffing http request & response using pcap in Ruby.

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  1. #!/usr/local/bin/ruby
  2. require 'pcaplet'
  3. httpdump = Pcaplet.new('-s 1500 -i eth0')
  4.  
  5. HTTP_REQUEST  = Pcap::Filter.new('tcp and dst port 80', httpdump.capture)
  6. HTTP_RESPONSE = Pcap::Filter.new('tcp and src port 80', httpdump.capture)
  7.  
  8. httpdump.add_filter(HTTP_REQUEST | HTTP_RESPONSE)
  9. httpdump.each_packet {|pkt|
  10.   data = pkt.tcp_data
  11.   case pkt
  12.   when HTTP_REQUEST
  13.     if data and data =~ /^GET\s+(\S+)/
  14.       path = $1
  15.       host = pkt.dst.to_s
  16.       host << ":#{pkt.dst_port}" if pkt.dport != 80
  17.       s = "#{pkt.src}:#{pkt.sport} > GET http://#{host}#{path}"
  18.     end
  19.   when HTTP_RESPONSE
  20.     if data and data =~ /^(HTTP\/.*)$/
  21.       status = $1
  22.       s = "#{pkt.dst}:#{pkt.dport} < #{status}"
  23.     end
  24.   end
  25.   puts s if s
  26. }

URL: http://www.google.com/codesearch/p?hl=en#e3Lo27gapsI/UNIX/utilities/framework-3.0.tar.gz|z3AQRfppUi8/framework-3.0/external/ruby-pcapx/examples/httpdump.rb&q=Pcap::Filter

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