From: Robert Klemme <bob.news@...>
Date: 2004-02-04T18:00:12+09:00
Subject: Re: String.hex and valid mac addresses : a cleaner way ?


"Theodore Knab" <tjk@annapolislinux.org> schrieb im Newsbeitrag
news:20040203205800.GA14769@annapolislinux.org...
> Is there a cleaner way to doing this ?
>
> Here is my code it finds bad mac addresses.
> #start of source code
>
> #!/usr/bin/ruby -w
> #find_bad_mac.rb
> #description takes input of mac addresses and finds the bad ones
> #
> #usage pipe a file of mac addresses to this program
> #
> #cat mac_addresses | find_bad_mac.rb
>
> linecounter = 0
>
> def check_zero(string)
>   #checks zeros
>   #valid base 16 numbers are '00' but not '0'
>
>   if string.to_s == "00"
>     return string=0
>   else
>     return string
>   end
>
> end
>
> while gets
>
>   #a will hold an array of base 16 numbers
>   a = []
>
>   #line counter
>   linecounter = linecounter + 1
>
>   mac_address = $_.chomp!
>
>   #mac address is transformed into an array called 'a'
>   a = $_.split(/:/)
>
>   l = linecounter.to_s
>
>
>   #each element in array is checked
>   a.each   { |element|
>
>     print "debug " +  l + " element:" + element + "\n"
>
>     #tranforms the element into a number
>     b = element.to_s.hex
>
>     #zeros are sometimes bad but not always
>     if b == 0
>
>      #if number is 0 check to see if it is '00' which is a valid base 16
number
>      #or '0' which is not a valid base 16 number.
>
>      zero = check_zero(element.to_s)
>
>      #if the number is not base 16
>      if zero != 0
>
>         #create a string with all messed up mac entry
>         s = a.join(":")
>
>         print "error with mac address entry " + s.to_s + "\n"
>         end
>
>       end
>
>       }
>      print "-----------------------------------------------\n"
> end
> ##########################################
> #end of source code
> ~
>
> -- 
> ------------------------------------------
> Ted Knab
> Chester, MD 21619
> ------------------------------------------
> 35570707f6274702478656021626f6c6964796f6e602f66602478656
> 02e6164796f6e60237471647560216e6460276c6f62616c60257e696
> 4797e2a0
>
>

#!/usr/bin/ruby -w
#find_bad_mac.rb
#description takes input of mac addresses and finds the bad ones
#
#usage pipe a file of mac addresses to this program
#
#cat mac_addresses | find_bad_mac.rb

def check_mac(mac_address)
  #each element in array is checked
  mac_address.split(/:/).each do |element|
    $stderr.print "debug #{$.} element: #{element}\n"

    #if the number is not base 16
    return false if element != "00" && element.hex == 0
  end

  true
end

while ( mac_address = gets )
  mac_address.chomp!
  print "error with mac address entry #{mac_address}\n" unless check_mac
mac_address
  print "-----------------------------------------------\n"
end

    robert