From c48ebde5ce6db3da8cd571d213d1a1f265de8983 Mon Sep 17 00:00:00 2001
From: Toke Høiland-Jørgensen <toke@toke.dk>
Date: Thu, 1 Apr 2021 19:20:13 +0200
Subject: sysdep: Add wrapper to get random bytes

Add a wrapper function in sysdep to get random bytes, and required checks
in configure.ac to select how to do it. The configure script tries, in
order, getrandom(), getentropy() and reading from /dev/urandom.
---
 configure.ac | 4 ++++
 1 file changed, 4 insertions(+)

(limited to 'configure.ac')

diff --git a/configure.ac b/configure.ac
index 7d92a5d4..ded258d3 100644
--- a/configure.ac
+++ b/configure.ac
@@ -374,6 +374,10 @@ elif test "$bird_cv_lib_log" != yes ; then
   LIBS="$LIBS $bird_cv_lib_log"
 fi
 
+AC_CHECK_FUNCS(getrandom)
+AC_CHECK_FUNCS(getentropy)
+AC_CHECK_HEADERS(sys/random.h)
+
 if test "$enable_debug" = yes ; then
   AC_DEFINE([DEBUGGING], [1], [Define to 1 if debugging is enabled])
   LDFLAGS="$LDFLAGS -rdynamic"
-- 
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