From bc282425088455198a7a99511c75914477d4ed32 Mon Sep 17 00:00:00 2001
From: Daniel Baumann <daniel.baumann@progress-linux.org>
Date: Sat, 13 Apr 2024 23:14:51 +0200
Subject: Merging upstream version 1.9.3.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
---
 dns_random.hh | 93 ++++++++++++++++++++++++++++++++++-------------------------
 1 file changed, 54 insertions(+), 39 deletions(-)

(limited to 'dns_random.hh')

diff --git a/dns_random.hh b/dns_random.hh
index 5c5e441..c3bd314 100644
--- a/dns_random.hh
+++ b/dns_random.hh
@@ -24,54 +24,69 @@
 #include <limits>
 #include <string>
 
-void dns_random_init(const std::string& data = "", bool force_reinit = false);
-uint32_t dns_random(uint32_t n);
-uint16_t dns_random_uint16();
+#include <ext/arc4random/arc4random.hh>
 
-namespace pdns {
-  struct dns_random_engine {
+inline uint32_t dns_random(uint32_t upper_bound)
+{
+  return arc4random_uniform(upper_bound);
+}
+
+inline uint32_t dns_random_uint32()
+{
+  return arc4random();
+}
 
-    typedef uint32_t result_type;
+inline uint16_t dns_random_uint16()
+{
+  return arc4random() & 0xffff;
+}
 
-    static constexpr result_type min()
-    {
-      return 0;
-    }
+namespace pdns
+{
+struct dns_random_engine
+{
 
-    static constexpr result_type max()
-    {
-      return std::numeric_limits<result_type>::max() - 1;
-    }
+  using result_type = uint32_t;
+
+  static constexpr result_type min()
+  {
+    return 0;
+  }
 
-    result_type operator()()
-    {
-      return dns_random(std::numeric_limits<result_type>::max());
-    }
-  };
+  static constexpr result_type max()
+  {
+    return std::numeric_limits<result_type>::max();
+  }
 
-  /* minimum value that a PRNG should return for this upper bound to avoid a modulo bias */
-  inline unsigned int random_minimum_acceptable_value(uint32_t upper_bound)
+  result_type operator()()
   {
-    /* Parts of this code come from arc4random_uniform */
-    /* To avoid "modulo bias" for some methods, calculate
-       minimum acceptable value for random number to improve
-       uniformity.
+    return dns_random_uint32();
+  }
+};
+
+/* minimum value that a PRNG should return for this upper bound to avoid a modulo bias */
+inline unsigned int random_minimum_acceptable_value(uint32_t upper_bound)
+{
+  /* Parts of this code come from arc4random_uniform */
+  /* To avoid "modulo bias" for some methods, calculate
+     minimum acceptable value for random number to improve
+     uniformity.
 
-       On applicable rngs, we loop until the rng spews out
-       value larger than min, and then take modulo out of that.
-    */
-    unsigned int min;
+     On applicable rngs, we loop until the rng spews out
+     value larger than min, and then take modulo out of that.
+  */
+  unsigned int min = 0;
 #if (ULONG_MAX > 0xffffffffUL)
-    min = 0x100000000UL % upper_bound;
+  min = 0x100000000UL % upper_bound;
 #else
-    /* Calculate (2**32 % upper_bound) avoiding 64-bit math */
-    if (upper_bound > 0x80000000)
-      min = 1 + ~upper_bound; /* 2**32 - upper_bound */
-    else {
-      /* (2**32 - (x * 2)) % x == 2**32 % x when x <= 2**31 */
-      min = ((0xffffffff - (upper_bound * 2)) + 1) % upper_bound;
-    }
-#endif
-    return min;
+  /* Calculate (2**32 % upper_bound) avoiding 64-bit math */
+  if (upper_bound > 0x80000000)
+    min = 1 + ~upper_bound; /* 2**32 - upper_bound */
+  else {
+    /* (2**32 - (x * 2)) % x == 2**32 % x when x <= 2**31 */
+    min = ((0xffffffff - (upper_bound * 2)) + 1) % upper_bound;
   }
+#endif
+  return min;
+}
 }
-- 
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