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Check if sys/random.h is required for getentropy on OSX.

pull/1/head
James Hilliard 5 years ago
parent
commit
ee2d10ad0c
  1. 8
      configure.ac
  2. 14
      src/random.cpp

8
configure.ac

@ -675,6 +675,14 @@ AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#include <unistd.h>]], @@ -675,6 +675,14 @@ AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#include <unistd.h>]],
[ AC_MSG_RESULT(no)]
)
AC_MSG_CHECKING(for getentropy via random.h)
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#include <unistd.h>
#include <sys/random.h>]],
[[ getentropy(nullptr, 32) ]])],
[ AC_MSG_RESULT(yes); AC_DEFINE(HAVE_GETENTROPY_RAND, 1,[Define this symbol if the BSD getentropy system call is available with sys/random.h]) ],
[ AC_MSG_RESULT(no)]
)
AC_MSG_CHECKING(for sysctl KERN_ARND)
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#include <sys/types.h>
#include <sys/sysctl.h>]],

14
src/random.cpp

@ -27,9 +27,12 @@ @@ -27,9 +27,12 @@
#include <sys/syscall.h>
#include <linux/random.h>
#endif
#ifdef HAVE_GETENTROPY
#if defined(HAVE_GETENTROPY) || (defined(HAVE_GETENTROPY_RAND) && defined(MAC_OSX))
#include <unistd.h>
#endif
#if defined(HAVE_GETENTROPY_RAND) && defined(MAC_OSX)
#include <sys/random.h>
#endif
#ifdef HAVE_SYSCTL_ARND
#include <sys/sysctl.h>
#endif
@ -237,6 +240,15 @@ void GetOSRand(unsigned char *ent32) @@ -237,6 +240,15 @@ void GetOSRand(unsigned char *ent32)
if (getentropy(ent32, NUM_OS_RANDOM_BYTES) != 0) {
RandFailure();
}
#elif defined(HAVE_GETENTROPY_RAND) && defined(MAC_OSX)
// We need a fallback for OSX < 10.12
if (&getentropy != NULL) {
if (getentropy(ent32, NUM_OS_RANDOM_BYTES) != 0) {
RandFailure();
}
} else {
GetDevURandom(ent32);
}
#elif defined(HAVE_SYSCTL_ARND)
/* FreeBSD and similar. It is possible for the call to return less
* bytes than requested, so need to read in a loop.

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