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Code Issues 1 Releases Wiki Activity

Switch to using /dev/urandom for OS X prior to 10.7

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This commit is contained in:
Jason Pepas 2020-06-30 04:17:01 -05:00
parent f5d208d5d6
commit f06e9ae30c
2 changed files with 9 additions and 24 deletions
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1
src/conf/janetconf.h
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@ -58,7 +58,6 @@
/* #define JANET_NO_REALPATH */
/* #define JANET_NO_SYMLINKS */
/* #define JANET_NO_UMASK */
/* #define JANET_NO_ARC4RANDOM_BUF */
/* #define JANET_OUT_OF_MEMORY do { printf("janet out of memory\n"); exit(1); } while (0) */
/* #define JANET_EXIT(msg) do { printf("C assert failed executing janet: %s\n", msg); exit(1); } while (0) */
/* #define JANET_TOP_LEVEL_SIGNAL(msg) call_my_function((msg), stderr) */

32
src/core/os.c
View File

@ -39,6 +39,10 @@
#define RETRY_EINTR(RC, CALL) do { (RC) = CALL; } while((RC) < 0 && errno == EINTR)
#ifdef JANET_APPLE
#include <AvailabilityMacros.h>
#endif
#ifdef JANET_WINDOWS
#include <windows.h>
#include <direct.h>
@ -66,29 +70,10 @@ extern char **environ;
/* Setting C99 standard makes this not available, but it should
* work/link properly if we detect a BSD */
#if defined(JANET_BSD) || defined(JANET_APPLE)
#if defined(JANET_BSD) || defined(MAC_OS_X_VERSION_10_7)
void arc4random_buf(void *buf, size_t nbytes);
#endif
/* arc4random_buf wasn't available in OS X until 10.7. */
#ifdef JANET_NO_ARC4RANDOM_BUF
uint32_t arc4random(void);
void arc4random_buf(void *buf, size_t nbytes) {
uint32_t *buf_as_words = (uint32_t*)buf;
size_t nwords = nbytes / 4;
for (size_t i=0; i < nwords; i++) {
buf_as_words[i] = arc4random();
}
size_t tail_len = nbytes % 4;
if (tail_len) {
uint8_t *tail = buf + nbytes - tail_len;
uint32_t rand = arc4random();
memcpy(tail, &rand, tail_len);
}
}
#endif
/* Not POSIX, but all Unixes but Solaris have this function. */
#if defined(JANET_POSIX) && !defined(__sun)
time_t timegm(struct tm *tm);
@ -625,10 +610,11 @@ static Janet os_cryptorand(int32_t argc, Janet *argv) {
v = v >> 8;
}
}
#elif defined(JANET_LINUX)
#elif defined(JANET_LINUX) || ( defined(JANET_APPLE) && !defined(MAC_OS_X_VERSION_10_7) )
/* We should be able to call getrandom on linux, but it doesn't seem
to be uniformly supported on linux distros.
In both cases, use this fallback path for now... */
On Mac, arc4random_buf wasn't available on until 10.7.
In these cases, use this fallback path for now... */
int rc;
int randfd;
RETRY_EINTR(randfd, open("/dev/urandom", O_RDONLY | O_CLOEXEC));
@ -645,7 +631,7 @@ static Janet os_cryptorand(int32_t argc, Janet *argv) {
n -= nread;
}
RETRY_EINTR(rc, close(randfd));
#elif defined(JANET_BSD) || defined(JANET_APPLE)
#elif defined(JANET_BSD) || defined(MAC_OS_X_VERSION_10_7)
(void) genericerr;
arc4random_buf(buffer->data + offset, n);
#else