How to hide exit and die

mnooning has asked for the wisdom of the Perl Monks concerning the following question:

Hello, I have a rather esoteric question.

I know an expert can always find where the code exits by tracing with a hex debugger, but I am trying to hide where I exit the code at the human readable level anyway. The code snippet below works, but not if "use Tk;" is present, which it is in a number of modules the real code invokes.

I am obviously dealing with legacy code (Tk is used. ActiveState no longer supports Tk).

Is there any other way to hide an "exit;"?

How about a "die()";

use Tk;
my $etriped = 'e'.
                  'x'.
                       'i'.
                            't';
print "1\n";
eval ("$etriped");
print "2\n"; # Reached if "use Tk;" is present.
[download]

Comment on How to hide exit and die Download Code

Replies are listed 'Best First'.
Re: How to hide exit and die by golux (Chaplain) on Jan 14, 2015 at 18:43 UTC
Hi mnooning, Try "CORE::exit". For example: `use strict; use warnings; use Tk; my $etriped = 'e' . 'x' . 'i' . 't'; print "1\n"; eval ("CORE::$etriped"); print "Error: $@\n"; print "2\n"; # Reached if "use Tk;" is present.` [download] say substr+lc crypt(qw $i3 SI$),4,5	[reply] [d/l]
Re^2: How to hide exit and die by Anonymous Monk on Jan 14, 2015 at 19:14 UTC
It works! Thanks.	[reply]
Re: How to hide exit and die by Corion (Patriarch) on Jan 14, 2015 at 18:07 UTC
Maybe Tk catches `exit`? You could try POSIX::exit instead.	[reply] [d/l]
Re^2: How to hide exit and die by mnooning (Beadle) on Jan 14, 2015 at 19:21 UTC
No, POSIX::exit did not work. golux's CORE::exit idea does though. Thanks to you both.	[reply]
Re: How to hide exit and die by QM (Parson) on Jan 15, 2015 at 14:38 UTC
To improve your obfuscation, you could also use rot13, and undo that in the eval: `my $etriped = 'rkvg'; $etriped =~ tr/a-zA-Z/n-za-mN-ZA-M/; eval("$etriped");` [download] -QM -- Quantum Mechanics: The dreams stuff is made of	[reply] [d/l]