From 67204063f9311ebb6b86f59ac5af16605c307ef7 Mon Sep 17 00:00:00 2001
From: Ray Strode <rstrode@redhat.com>
Date: Sun, 3 Dec 2023 18:59:18 -0500
Subject: [PATCH] ply-utils: Add function for getting random number

rand() and srand() are we use now and it's not working out too well
because we're seeding correctly in a number of places.

This commit adds one function to do it better.

Problem spotted by @emperor06
---
 src/libply/ply-utils.c | 22 ++++++++++++++++++++++
 src/libply/ply-utils.h |  2 ++
 2 files changed, 24 insertions(+)

diff --git a/src/libply/ply-utils.c b/src/libply/ply-utils.c
index dd6294f6..abbc8b5a 100644
--- a/src/libply/ply-utils.c
+++ b/src/libply/ply-utils.c
@@ -1211,4 +1211,26 @@ ply_is_secure_boot_enabled (void)
         return is_secure_boot_enabled;
 }
 
+long
+ply_get_random_number (long lower_bound,
+                       long range)
+{
+        static bool seed_initialized = false;
+        long offset;
+
+        if (!seed_initialized) {
+                struct timespec now = { 0L, /* zero-filled */ };
+
+                clock_gettime (CLOCK_TAI, &now);
+                srand48 (now.tv_nsec);
+                seed_initialized = true;
+        }
+
+        offset = mrand48 ();
+
+        offset = labs (offset) % range;
+
+        return lower_bound + offset;
+}
+
 /* vim: set ts=4 sw=4 expandtab autoindent cindent cino={.5s,(0: */
diff --git a/src/libply/ply-utils.h b/src/libply/ply-utils.h
index 8000632b..289d3a3f 100644
--- a/src/libply/ply-utils.h
+++ b/src/libply/ply-utils.h
@@ -160,6 +160,8 @@ double ply_strtod (const char *str);
 
 bool ply_is_secure_boot_enabled (void);
 
+long ply_get_random_number (long lower_bound, long range);
+
 #endif
 
 #endif /* PLY_UTILS_H */
-- 
2.47.3