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Date:         Fri, 8 Oct 1999 11:22:35 +0200
Reply-To:     F a b r i z i o <Fabrizio1@USA.NET>
Sender:       "SAS(r) Discussion" <SAS-L@LISTSERV.UGA.EDU>
From:         F a b r i z i o <Fabrizio1@USA.NET>
Organization: KLM Royal Dutch Airlines
Subject:      Re: "Secure" macro ?

James Carter wrote in message <85256803.00524392.00@sctmnot10.sctcorp.com>... >Hello L-ers! > >I'm trying to come up with a "secure" macro, that is, one which >cannot be viewed via the MPRINT (and/or MLOGIC) option. For >macros that execute outside of a DATA step or PROC, it seems easy >enough to just issue the "OPTIONS NOMPRINT" statement as the >first line in the macro. But... for macros that resolve INSIDE a >data step statement or PROC, the timing of producing an options >statement doesn't work.

Hi James,

Though the following piece of code is not fool-proof, it is a possible work-around for embedded OPTIONS statements.

First, the macro checks the settings of MPRINT MGEN SGEN etc., and if these are nor all masked, the macro does 2 things:

1) It turns off the corresponding options 2) It invokes itself as a nested macro, with these new options in effect.

Some notes: The parameter list (x=1, y=2, z=3) can be adapted to whatever you need, but leave the /parmbuff intact. It is very essential for the macro to be able to re-invoke itself.

You may still fool this macro through the use of old-style macros (i.e. MACRO xxx %) that carry names like 'OPTIONS', 'MPRINT' etc., and it takes much more effort to mask that too (it is possible, but I am not allowed to publish that piece of proprietary software).

The piece of code that should be obscured can be inserted at the comment box.

Here comes the code:

%macro secure (x=1, y=2, z=3) / parmbuff; %local oldopt newopt; %let oldopt= %sysfunc(getoption(macrogen )); %let newopt= NOMACROGEN; %let oldopt=&oldopt %sysfunc(getoption(symbolgen)); %let newopt=&newopt NOSYMBOLGEN; %let oldopt=&oldopt %sysfunc(getoption(mlogic )); %let newopt=&newopt NOMLOGIC; %let oldopt=&oldopt %sysfunc(getoption(mprint )); %let newopt=&newopt NOMPRINT; %let oldopt=&oldopt %sysfunc(getoption(mtrace )); %let newopt=&newopt NOMTRACE; %if "&oldopt" ne "&newopt" %then %do; options &newopt; %secure &SYSPBUFF options &oldopt; %goto exit; %end;

/*-----------------------------------------------------------------*/ /* */ /* Here comes the macro part which runs fully secured */ /* */ /*-----------------------------------------------------------------*/

%exit: %mend secure;

Hope this helps?

Grtz., Fabrizio


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