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

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Cherry-picked from: ee2d10ad0c0e04d0b9da4535a6fff265ac2501e5
This commit is contained in:
James Hilliard 2017-07-27 15:34:09 +03:00 committed by xanimo
parent 265f258540
commit 743c3acd3d
No known key found for this signature in database
GPG Key ID: 6E8F17C1B1BCDCBE
2 changed files with 21 additions and 1 deletions
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8
configure.ac
View File

@ -655,6 +655,14 @@ 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
View File

@ -25,9 +25,12 @@
#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
@ -164,6 +167,15 @@ 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.