From a1933bd1847951b959016f59ee744d1b18a00142 Mon Sep 17 00:00:00 2001 From: Laurent Bercot Date: Fri, 14 Oct 2016 17:07:56 +0000 Subject: Clean up and modernize librandom. Correct random number generation has historically been suprisingly painful to achieve. There was no standard, every system behaved in a subtly different way, and there were a few userland initiatives to get decent randomness, all incompatible of course. The situation is a bit better now, we're heading towards some standardization. The arc4random() series of functions is a good API, and available on a lot of systems - unfortunately not Linux, but on Linux the new getrandom() makes using /dev/random obsolete. So I removed the old crap in librandom, dropped EGD support, dropped dynamic backend selection, made a single API series (random_* instead of goodrandom_* and badrandom_*), added an arc4random backend and a getrandom backend, and defaulted to /dev/urandom backed up by SURF in the worst case. This should be much smaller and logical. However, it's a major API break, so the skarnet.org stack will be changed to adapt. --- src/sysdeps/trygetrandom.c | 22 ++++++++++++++++++++++ 1 file changed, 22 insertions(+) create mode 100644 src/sysdeps/trygetrandom.c (limited to 'src/sysdeps/trygetrandom.c') diff --git a/src/sysdeps/trygetrandom.c b/src/sysdeps/trygetrandom.c new file mode 100644 index 0000000..67a623d --- /dev/null +++ b/src/sysdeps/trygetrandom.c @@ -0,0 +1,22 @@ +/* ISC license. */ + +#undef _POSIX_C_SOURCE +#undef _XOPEN_SOURCE + +#ifndef _GNU_SOURCE +#define _GNU_SOURCE +#endif + +#include +#include + +static int getrandom (void *buf, size_t buflen, unsigned int flags) +{ + return syscall(SYS_getrandom, buf, buflen, flags) ; +} + +int main (void) +{ + char buf[4] ; + return getrandom(buf, 4, 0) ; +} -- cgit v1.3.1