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"
*/
#include <stdlib.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <errno.h>
+
+#include "sysdep/config.h"
+
+#ifdef HAVE_SYS_STAT_H
+# include <sys/stat.h>
+#endif
+#ifdef HAVE_LINUX_RANDOM_H
+# include <linux/random.h>
+#endif
+#if defined(HAVE_SYS_RANDOM_H) && (defined(HAVE_GETRANDOM) || defined(HAVE_GETENTROPY))
+# include <sys/random.h>
+#endif
#include "nest/bird.h"
rand_high = random();
return (rand_low & 0xffff) | ((rand_high & 0xffff) << 16);
}
+
+void
+random_init()
+{
+ char buf;
+ /* get a single random byte to trip any errors early */
+ random_bytes(&buf, sizeof(buf));
+}
+
+#if defined(HAVE_GETRANDOM) || defined(HAVE_GENTROPY)
+int
+random_bytes(char *buf, size_t size)
+{
+ int n;
+ int flags = 0;
+ while (0 < size) {
+#if defined(HAVE_GETRANDOM)
+ n = getrandom(buf, size, flags);
+#else
+ n = getentropy(buf, size);
+#endif
+ if (n < 0) {
+ if (errno == EINTR)
+ continue;
+ die("Couldn't get random bytes: %m");
+ }
+ buf += n;
+ size -= n;
+ }
+
+ return 0;
+}
+
+void random_close(void) {}
+
+#else
+
+static int urandom_fd = -1;
+int random_bytes(char *buf, size_t size)
+{
+ int n;
+
+ if (urandom_fd < 0)
+ {
+ urandom_fd = open("/dev/urandom", O_RDONLY);
+ if (urandom_fd < 0)
+ die("Couldn't open /dev/urandom: %m");
+ }
+
+ do
+ {
+ n = read(urandom_fd, buf, size);
+ if (n <= 0) {
+ if (errno == EINTR)
+ continue;
+ die("Couldn't read from /dev/urandom: %m");
+ }
+ buf += n;
+ size -= n;
+ } while (size > 0);
+
+ return 0;
+}
+
+void
+random_close(void)
+{
+ if (urandom_fd >= 0) {
+ close(urandom_fd);
+ urandom_fd = -1;
+ }
+}
+#endif