Funny script to make a graph of the current connections

network-graphviz.sh

#!/usr/bin/env bash

# requires graphviz

dot -Tpng -o network-$(date +%Y-%m-%d-%H-%M-%S).png < <(sudo netstat -ntu | awk 'BEGIN \
        { 
                print "digraph network {\n\tsize=\"35\" node [shape = circle, style=filled];\n\tratio = fill;\n\trankdir=LR;"; \
        } \
        /^(ud|tc)p.+/ \
        { 
                match($4, /(.+):([0-9]{1,5})$/, _loc);
                match($5, /(.+):([0-9]{1,5})$/, _dist);

                switch($6) \
                { \
                        case "ESTABLISHED": 
                                _fontcolor="green"
                                break;
                        case "CLOSE_WAIT": 
                                _fontcolor="orange" 
                                break;
                        case "TIME_WAIT": 
                                _fontcolor="red"
                                break;
                        case "LAST_ACK": 
                                _fontcolor="purple"
                                break;
                        default: 
                                _fontcolor="blue" 
                                break;
                } \
                print "\t\""_loc[1]"\" -> \""_dist[1]"\" [ label = \""_loc[2]" <-> "_dist[2]"\" fontcolor="_fontcolor" ];" \
        } \
        END \
        { 
                print "}"; \
        }')