New upstream version 3.1.1

include/random_numbers.h

@@ -0,0 +1,69 @@
+/**
+ * (C) 2007-22 - ntop.org and contributors
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not see see <http://www.gnu.org/licenses/>
+ *
+ */
+
+
+#ifndef RND_H
+#define RND_H
+
+
+#include <stdint.h>
+#include <stddef.h>
+#include <time.h>        /* time, clock */
+
+#include "n2n.h"         /* traceEvent */
+
+
+// syscall and inquiring random number from hardware generators might fail, so we will retry
+#define RND_RETRIES      1000
+
+#if defined (__linux__)
+#include <sys/syscall.h> /* syscall, SYS_getrandom */
+#ifdef SYS_getrandom
+#define GRND_NONBLOCK       1
+#include <errno.h>       /* errno, EAGAIN */
+#endif
+#endif
+
+#if defined (__RDRND__) || defined (__RDSEED__)
+#include <immintrin.h>  /* _rdrand64_step, rdseed4_step */
+#endif
+
+#if defined (WIN32)
+#include <wincrypt.h>   // HCTYPTPROV, Crypt*-functions
+#endif
+
+
+typedef struct rn_generator_state_t {
+    uint64_t a, b;
+} rn_generator_state_t;
+
+typedef struct splitmix64_state_t {
+    uint64_t s;
+} splitmix64_state_t;
+
+
+int n2n_srand (uint64_t seed);
+
+uint64_t n2n_rand (void);
+
+uint64_t n2n_seed (void);
+
+uint32_t n2n_rand_sqr (uint32_t max_n);
+
+
+#endif // RND_H