Dc hub scanner for LAN

hubscanner.rb

#This Script is released under Gnu GPL
require 'socket'
require 'timeout'

class Hubscan

    def initialize
        @init_ip=192
        @end_ip=216
        @verbose=false
        @time_out=10
        puts "Do you want to continue with default configuration? Press n to enter custom settings [Y/n]"
        self.get_choice do |x|
            if x =~ /^[yY]/ then
                self.print_settings
                self.scan
            else
                puts "Enter start ip range as in xxx in 192.168.xxx.0\n"
                @init_ip=gets.chop.to_i
                puts "Enter start ip range as in xxx in 192.168.xxx.255\n"
                @end_ip=gets.chop.to_i
                puts "Enable verbose mode? Verbose mode enables you to see whats happening in detail throught the scannig process [Y/n]"
                self.get_choice do |x|
                    if x=~ /^[yY]/ then
                        @verbose=true
                    end
                end
                puts "Enter the maximum time for each scan, ideally between 10 to 100"
                @time_out=gets.chop.to_i
                self.print_settings
                self.scan
            end
        end
    end
    
    def print_settings
        puts "Scan Settings:\nFrom:192.168.#{@init_ip}.0\tTo:192.168.#{@end_ip}.255\nVerbose Mode?: #{@verbose}\tTime span for each scan: #{@time_out}"
    end
    
    def get_choice
        while @choice=gets.chop and !/^[yYnN]/.match(@choice) do
            puts "Please enter one of the following y/Y/n/N"
        end
        yield @choice
    end
    
    class Hubrunning < Exception
    end
    
    def scan
        puts "-----------Starting Scan--------------"
        (@init_ip..@end_ip).each do |i|
            (0..255).each do |j|
            print "Scannig 192.168.#{i}.#{j}\t" if @verbose
                begin
                time_limit=Timeout::timeout(@time_out/1000.0) {
                    @sock=TCPSocket.new("192.168.#{i}.#{j}",411)
                    raise Hubrunning, "Hub found"
                }
                rescue Hubrunning
                    begin
                        puts "DC hub found at => 192.168.#{i}.#{j}"
                    ensure
                        @sock.close
                    end
                rescue Errno::ENOBUFS
                    puts "Sorry! Ran out of memory!"
                rescue Timeout::Error
                    puts "Error: Timeout" if @verbose
                rescue Errno::ENETUNREACH
                    puts "Error: Network not reachable" if @verbose
                rescue Errno::ECONNREFUSED
                    puts "Error: Connection refused" if @verbose
                end
            end
        end
        puts "-----------End of Scan----------------\nClose your DC++ and run for best results\nDo you want to run the scan again? [Y/n]"
        self.get_choice do |x|
            if x =~ /^[yY]/ then
                self.scan
            else
                puts "Credits: Phanindra Srungavarapu\nEmail: pahninsd@gmail.com\nSource code: https://gist.github.com/3638098"
            end
        end
    end
end

Hubscan.new