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181 lines
5.0 KiB
C
181 lines
5.0 KiB
C
/*
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* banned - optionally ban dangerous functions
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*
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* Unless UNBAN is defined, this file will turn the use
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* of certain dangerous functions into syntax errors.
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*
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* In the case of calc, we are motivated in part by the desire for
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* calc to correctly calculate: even during extremely long calculations.
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*
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* If UNBAN is NOT defined, then calling certain functions
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* will result in a syntax error.
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*
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* If we define UNBAN, then the effect of this file is disabled.
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*
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* The banned.h attempts to ban the use of certain dangerous functions
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* that, if improperly used, could compromise the computational integrity
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* if calculations.
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*
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* In the case of calc, we are motivated in part by the desire for calc
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* to correctly calculate: even during extremely long calculations.
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*
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* If UNBAN is NOT defined, then calling certain functions
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* will result in a call to a non-existent function (link error).
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*
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* While we do NOT encourage defining UNBAN, there may be
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* a system / compiler environment where re-defining a
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* function may lead to a fatal compiler complication.
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* If that happens, consider compiling as:
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*
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* make clobber all chk CCBAN=-DUNBAN
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*
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* as see if this is a work-a-round.
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*
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* If YOU discover a need for the -DUNBAN work-a-round, PLEASE tell us!
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* Please send us a bug report. See the file:
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*
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* BUGS
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*
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* or the URL:
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*
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* http://www.isthe.com/chongo/tech/comp/calc/calc-bugrept.html
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*
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* for how to send us such a bug report.
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*
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* Copyright (C) 2021 Landon Curt Noll
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*
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* Calc is open software; you can redistribute it and/or modify it under
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* the terms of the version 2.1 of the GNU Lesser General Public License
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* as published by the Free Software Foundation.
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*
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* Calc is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General
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* Public License for more details.
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*
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* A copy of version 2.1 of the GNU Lesser General Public License is
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* distributed with calc under the filename COPYING-LGPL. You should have
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* received a copy with calc; if not, write to Free Software Foundation, Inc.
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*
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* Under source code control: 2021/03/06 21:07:31
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* File existed as early as: 2021
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*
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* chongo <was here> /\oo/\ http://www.isthe.com/chongo/
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* Share and enjoy! :-) http://www.isthe.com/chongo/tech/comp/calc/
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*/
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#if !defined(PRE_HAVE_BAN_PRAGMA_H)
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#include "have_ban_pragma.h"
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#endif /* ! PRE_HAVE_BAN_PRAGMA_H */
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#if !defined(INCLUDE_BANNED_H)
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#define INCLUDE_BANNED_H
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/*
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* If we define UNBAN, then the effect of this file is disabled.
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*/
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#if !defined(UNBAN)
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/*
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* In the spirit of:
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*
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* https://github.com/git/git/blob/master/banned.h
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*
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* we will ban the use of certain unsafe functions by turning
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* then into function calls that do not exist.
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*
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* In the case of calc, we are motivated in part by the desire
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* for calc to correctly calculate: even during extremely long
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* calculations.
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*
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* If UNBAN is NOT defined, then calling certain functions
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* will result in a syntax error.
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*
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* Unlike the above URL, we suggest an alternative function.
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* In many cases, additional logic is required to use the
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* alternative function, we cannot simply replace one function
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* with another.
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*/
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/*
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* If one is not careful, strcpy() can lead to buffer overflows.
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* Use strlcpy() instead.
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*/
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#if defined(HAVE_PRAGMA_GCC_POSION)
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#undef strcpy
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#pragma GCC poison strcpy
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#endif /* HAVE_PRAGMA_GCC_POSION */
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/*
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* If one is not careful, strcat() can lead to buffer overflows.
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* Use strlcat() instead.
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*/
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#if defined(HAVE_PRAGMA_GCC_POSION)
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#undef strcat
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#pragma GCC poison strcat
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#endif /* HAVE_PRAGMA_GCC_POSION */
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/*
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* If one is not careful, strncpy() can lead to buffer overflows.
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* Use memccpy() instead.
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*/
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#if defined(HAVE_PRAGMA_GCC_POSION)
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#undef strncpy
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#pragma GCC poison strncpy
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#endif /* HAVE_PRAGMA_GCC_POSION */
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/*
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* If one is not careful, strncat() can lead to buffer overflows.
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* Use memccpy() instead.
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*/
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#if defined(HAVE_PRAGMA_GCC_POSION)
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#undef strncat
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#pragma GCC poison strncat
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#endif /* HAVE_PRAGMA_GCC_POSION */
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/*
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* If one is not careful, sprintf() can lead to buffer overflows.
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* Use snprintf() instead.
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*/
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#if defined(HAVE_PRAGMA_GCC_POSION)
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#undef sprintf
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#pragma GCC poison sprintf
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#endif /* HAVE_PRAGMA_GCC_POSION */
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/*
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* If one is not careful, vsprintf() can lead to buffer overflows.
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* Use vsnprintf() instead.
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*/
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#if defined(HAVE_PRAGMA_GCC_POSION)
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#undef vsprintf
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#pragma GCC poison vsprintf
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#endif /* HAVE_PRAGMA_GCC_POSION */
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/*
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* XXX - As of 2021, functions such as:
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*
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* gmtime_s
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* localtime_s
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* ctime_s
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* asctime_s
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*
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* are not universal. We cannot yet ban the following
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* functions because we do not have a portable AND
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* widely available alternative. Therefore we just
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* have to be extra careful when using:
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*
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* gmtime
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* localtime
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* ctime
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* ctime_r
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* asctime
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* asctime_r
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*/
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#endif /* !UNBAN */
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#endif /* !INCLUDE_BANNED_H */
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