gistfile1.rb

require 'rubygems'
require 'activesupport'
require 'aws'
require 'graphviz'

ec2 = Aws::Ec2.new(ENV["AMAZON_ACCESS_KEY_ID"], ENV["AMAZON_SECRET_ACCESS_KEY"])

g = ec2.describe_security_groups

gv = GraphViz::new( "structs", "type" => "graph" )

# add node for each group
g.each{|group| gv.add_node(group[:aws_group_name], :shape => "box", :color => "lightblue") }

# add edges between nodes
#g.each{|group| group[:aws_perms].each{|perm| gv.add_edge(group[:aws_group_name], perm[:group]) unless perm[:group].nil? || perm[:group] == group[:aws_group_name]} } ; nil

g.each do |group| 
  group[:aws_perms].each do |perm| 
    if !perm[:group].nil?
      gv.add_edge(group[:aws_group_name], perm[:group]) unless perm[:group] == group[:aws_group_name]
    elsif !perm[:cidr_ips].nil?
      node_name = "#{perm[:protocol]}:#{perm[:cidr_ips]}:#{perm[:from_port]}-#{perm[:to_port]}"
      gv.add_node(node_name)
      gv.add_edge(group[:aws_group_name], node_name)
    end
  end
end; nil

gv.output( "output" => "png", :file => "output.png")