Below is a quick obfuscation script I wrote. That is, a script which obfuscates other scripts. The obfuscation isn't terribly good, but it's been successful in terms of keeping other peoples hands off of my code, which was the object in this case. Quite handy for those 700 line scripts that you don't want to obfuscate by hand. (Multi file scripts will need to be catted together before being run through the obfuscater.) Also, I have a question. I wonder if one of you obfuscation fans could give me a nice little obfuscation of this one line, such that I might add it to my automatically obfuscated script:

unless ($ENV{HTTP_HOST} ~= m/licensed_site.com/) {die "Code thief!"}
[download]

Of course, I need te be able to replace the domain name fairly easily. Perhaps a Perl one liner that obfuscates the string? Anyway, here's auto_obfuscate.pl:

#!/usr/bin/perl

$debug = 0;

my %varname;
my $varnum = 0;
my %subname;
my $subnum;

my $sub = 0;

$infile = $ARGV[0];

open(IN, "<$infile");
@prog = <IN>;
close IN;

open(TIDY, "|perltidy --mangle -st");

foreach $line (@prog)
{
   @token = split (/[^A-Za-z0-9_\$\@\%\\]+|\\./, "$line");
   foreach $tok (@token)
   {
      if ("$tok" eq "sub")
      {
         $sub = 1;
      }
      elsif ($sub)
      {
         $subnum++;
         $sub = 0;
         if ($subname{$tok} eq "")
         {
            $subname{$tok} =~ s/[a-z0-9]*/s_$subnum/;
         }
      }
   }
}

foreach $line (@prog)
{
   if ($debug)
   {
      print "$line";
   }

   # "$first$last" comes out as one token, so split them
   $line =~
     s/(\".*)(\$[A-Za-z0-9_\-]*)(\$[A-Za-z0-9_\-]*)(.*\")/\1\2\".\"\3\
+4/g;
   @token = split (/[^A-Za-z0-9_\$\@\%\\\#]+|\\./, "$line");
   foreach $tok (@token)
   {
      if ($debug)
      {
         print "$tok:";
      }
      if ($tok =~ m/[\$\@\%\#][a-z][a-z0-9]*/)
      {
         $oldname = "$tok";

         $oldname =~ s/[\$\@\%\#]*//;
         if ($varname{$oldname} eq "")
         {
            $varname{$oldname} =~ s/[a-z0-9]*/v_$varnum/;
            $varnum++;
         }
         $line =~ s/([\$\%\@]#?)$oldname([^a-z0-9A-Z])/\1$varname{$old
+name}\2/g;
      }
   }
   while (($oldname, $newname) = each %subname)
   {
      $line =~ s/$oldname([ \(\;])/$newname\1/g;
      $line =~ s/sub *$oldname([^a-zA-Z])/sub $newname\1/g;
   }

   $line =~ s/^\s*//g;
   unless (($line =~ m/^$/) || ($line =~ m/^#[^\!\-]/))
   {
      $outline++;
      if ($debug)
      {
         print "\n$line\n\n";
      }
      else
      {
         print TIDY "$line";
      }
   }
   if ($line =~ m/[\$\@\%]\{[^v]/)
   {
      print STDERR
        "Warning: bracketed variable not changed line $outline:\n$line
+";
   }
}
print "\n\n";

close TIDY;
[download]

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