From: anansi <kazaam@...>
Date: 2007-05-07T23:55:05+09:00
Subject: Why is my method not found? (NoMethodError)

Hi,
I have written a small tcp scanner procedural and wanted to change it to 
OOP but something went wrong. Until this line everything works fine:

            my_scanner.scanning(hosts,ports)

but here I always get:
           test.rb:95: private method `scanning' called for 
#<Scanner:0xb7c9c428> (NoMethodError)

but why? my_scanner is from the Scanner class which owns the method 
scanning?!? Do I get something wrong?

here's my code:

#!/usr/bin/ruby -w

require 'socket'
require 'timeout'


  class Scanner


     def initialize
        @hosts,@ports = Array($*)
     end



     def portarrange
        case @ports
          when /^.+[..]/                                        # for 
ranges (75..123)
             @ports = @ports.split("..")
             @ports = @ports[0].to_i..@ports[1].to_i
          when /^.+[,]/                                         # for 
multiple ports (34,345,213)
             @ports = @ports.split(",")
          else
             @ports = Array(@ports)                             # for 
one single port (21)
          end
     end



     def hostarrange
        case @hosts
          when /^.+[,]/                                        # for 
multiple IP's/hosts (81.95.1.40,64.111.124.251,www.cnn.com)
             @hosts = @hosts.split(",")
          else
             @hosts = Array(@hosts)                             # for 
one single port (81.95.1.40)
          end
     end


    def output(state,port)
       printed = false
       portsfile = File.new("ports", "r")
       scanpat = "^.+ #{port}/tcp"
       portsfile.each_line do |line|
                    if line =~ Regexp.new(scanpat)
                      puts "#{state}    : #{line}"
                      printed = true
                    end
                    puts "#{state}    : #{port}" if printed == false  end
       ensure
       portsfile.close
       end
    end

    def scanning(hosts,ports)
           hosts.each do |host|
            begin
              puts "scanning #{host}:"
              ports.each do |port|
                begin
                    Timeout::timeout(10){TCPSocket.new(host, port)}    # 
set timeout here
                       rescue Timeout::Error
                          output("filtered",port)
                       rescue
                          output("closed",port)
                       else
                          output("open",port)
                end   end
            end
    end
end


#####################  code  start  #####################

puts "no arguments past,correct usage:\nruby #{$0} [hosts] [ports]\n" if 
!ARGV[1]

my_scanner = Scanner.new

hosts = my_scanner.hostarrange
ports = my_scanner.portarrange
=begin
puts "debugging: "
puts hosts
puts ports
# everything alright until here
=end
my_scanner.scanning(hosts,ports)

#####################      eof      #####################


-- 
greets

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