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add macOS 10.12 getentropy checks

OPENBSD_6_1
Brent Cook 7 years ago
committed by Brent Cook
parent
commit
89a4ee5ef0
1 changed files with 46 additions and 1 deletions
  1. +46
    -1
      m4/check-libc-compat.m4

+ 46
- 1
m4/check-libc-compat.m4 View File

@ -39,7 +39,52 @@ AM_CONDITIONAL([HAVE_B64_NTOP], [test "x$ac_cv_func_b64_ntop_arg" = xyes])
AC_DEFUN([CHECK_CRYPTO_COMPAT], [
# Check crypto-related libc functions and syscalls
AC_CHECK_FUNCS([arc4random arc4random_buf arc4random_uniform])
AC_CHECK_FUNCS([explicit_bzero getauxval getentropy])
AC_CHECK_FUNCS([explicit_bzero getauxval])
AC_CACHE_CHECK([for getentropy], ac_cv_func_getentropy, [
AC_LINK_IFELSE([AC_LANG_PROGRAM([[
#include <sys/types.h>
#include <unistd.h>
/*
* Explanation:
*
* - iOS <= 10.1 fails because of missing sys/random.h
*
* - in macOS 10.12 getentropy is not tagged as introduced in
* 10.12 so we cannot use it for target < 10.12
*/
#ifdef __APPLE__
# include <AvailabilityMacros.h>
# include <TargetConditionals.h>
# if (TARGET_OS_IPHONE || TARGET_OS_SIMULATOR)
# include <sys/random.h> /* Not available as of iOS <= 10.1 */
# else
# include <sys/random.h> /* Pre 10.12 systems should die here */
/* Based on: https://gitweb.torproject.org/tor.git/commit/?id=16fcbd21 */
# ifndef MAC_OS_X_VERSION_10_12
# define MAC_OS_X_VERSION_10_12 101200 /* Robustness */
# endif
# if defined(MAC_OS_X_VERSION_MIN_REQUIRED)
# if MAC_OS_X_VERSION_MIN_REQUIRED < MAC_OS_X_VERSION_10_12
# error "Targeting on Mac OSX 10.11 or earlier"
# endif
# endif
# endif
#endif /* __APPLE__ */
]], [[
char buffer;
(void)getentropy(&buffer, sizeof (buffer));
]])],
[ ac_cv_func_getentropy="yes" ],
[ ac_cv_func_getentropy="no"
])
])
AC_CHECK_FUNCS([timingsafe_bcmp timingsafe_memcmp])
AM_CONDITIONAL([HAVE_ARC4RANDOM], [test "x$ac_cv_func_arc4random" = xyes])
AM_CONDITIONAL([HAVE_ARC4RANDOM_BUF], [test "x$ac_cv_func_arc4random_buf" = xyes])


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