Use arc4random() if it's available

While Privoxy doesn't need high quality pseudo-random numbers
there's no reason not to use them when we can and this silences
a warning emitted by code checkers that can't tell whether or not
the quality matters.

diff --git a/configure.in b/configure.in
index 13f42a6..b802a87 100644 (file)
--- a/configure.in
+++ b/configure.in
@@ -1,6 +1,6 @@
 dnl Process this file with autoconf to produce a configure script.
 dnl
-dnl $Id: configure.in,v 1.207 2016/12/24 16:00:49 fabiankeil Exp $
+dnl $Id: configure.in,v 1.208 2017/03/08 13:13:18 fabiankeil Exp $
 dnl
 dnl Written by and Copyright (C) 2001-2016 the
 dnl Privoxy team. https://www.privoxy.org/
@@ -32,7 +32,7 @@ dnl =================================================================
 dnl AutoConf Initialization
 dnl =================================================================
 
-AC_REVISION($Revision: 1.207 $)
+AC_REVISION($Revision: 1.208 $)
 AC_INIT(jcc.c)
 
 if test ! -f config.h.in; then
@@ -774,6 +774,7 @@ AC_PROG_GCC_TRADITIONAL
 AC_TYPE_SIGNAL
 AC_CHECK_FUNCS([ \
  access \
+ arc4random \
  atexit \
  getcwd \
  gethostbyaddr \

diff --git a/jcc.c b/jcc.c
index fa88995..3b5fa77 100644 (file)
--- a/jcc.c
+++ b/jcc.c
@@ -1,4 +1,4 @@
-const char jcc_rcs[] = "$Id: jcc.c,v 1.450 2016/12/24 16:01:32 fabiankeil Exp $";
+const char jcc_rcs[] = "$Id: jcc.c,v 1.451 2017/03/08 13:15:49 fabiankeil Exp $";
 /*********************************************************************
  *
  * File        :  $Source: /cvsroot/ijbswa/current/jcc.c,v $
@@ -210,9 +210,9 @@ privoxy_mutex_t gmtime_mutex;
 privoxy_mutex_t localtime_mutex;
 #endif /* ndef HAVE_GMTIME_R */
 
-#ifndef HAVE_RANDOM
+#if !defined(HAVE_ARC4RANDOM) && !defined(HAVE_RANDOM)
 privoxy_mutex_t rand_mutex;
-#endif /* ndef HAVE_RANDOM */
+#endif /* !defined(HAVE_ARC4RANDOM) && !defined(HAVE_RANDOM) */
 
 #endif /* def MUTEX_LOCKS_AVAILABLE */
 
@@ -3491,9 +3491,9 @@ static void initialize_mutexes(void)
    privoxy_mutex_init(&localtime_mutex);
 #endif /* ndef HAVE_GMTIME_R */
 
-#ifndef HAVE_RANDOM
+#if !defined(HAVE_ARC4RANDOM) && !defined(HAVE_RANDOM)
    privoxy_mutex_init(&rand_mutex);
-#endif /* ndef HAVE_RANDOM */
+#endif /* !defined(HAVE_ARC4RANDOM) && !defined(HAVE_RANDOM) */
 
 #endif /* def MUTEX_LOCKS_AVAILABLE */
 }
@@ -3529,7 +3529,9 @@ int main(int argc, char **argv)
 {
    int argc_pos = 0;
    int do_config_test = 0;
+#ifndef HAVE_ARC4RANDOM
    unsigned int random_seed;
+#endif
 #ifdef unix
    struct passwd *pw = NULL;
    struct group *grp = NULL;
@@ -3737,12 +3739,14 @@ int main(int argc, char **argv)
    InitWin32();
 #endif
 
+#ifndef HAVE_ARC4RANDOM
    random_seed = (unsigned int)time(NULL);
 #ifdef HAVE_RANDOM
    srandom(random_seed);
 #else
    srand(random_seed);
 #endif /* ifdef HAVE_RANDOM */
+#endif /* ifndef HAVE_ARC4RANDOM */
 
    /*
     * Unix signal handling

diff --git a/miscutil.c b/miscutil.c
index 10ff9ea..4a9b88f 100644 (file)
--- a/miscutil.c
+++ b/miscutil.c
@@ -1,4 +1,4 @@
-const char miscutil_rcs[] = "$Id: miscutil.c,v 1.81 2016/02/26 12:29:17 fabiankeil Exp $";
+const char miscutil_rcs[] = "$Id: miscutil.c,v 1.82 2016/07/23 23:05:15 ler762 Exp $";
 /*********************************************************************
  *
  * File        :  $Source: /cvsroot/ijbswa/current/miscutil.c,v $
@@ -765,7 +765,9 @@ long int pick_from_range(long int range)
 
    if (range <= 0) return 0;
 
-#ifdef HAVE_RANDOM
+#ifdef HAVE_ARC4RANDOM
+   number = arc4random() % range + 1;
+#elif defined(HAVE_RANDOM)
    number = random() % range + 1;
 #elif defined(MUTEX_LOCKS_AVAILABLE)
    privoxy_mutex_lock(&rand_mutex);
@@ -789,7 +791,7 @@ long int pick_from_range(long int range)
       "might cause crashes, predictable results or even combine these fine options.");
    number = rand() % (long int)(range + 1);
 
-#endif /* (def HAVE_RANDOM) */
+#endif /* (def HAVE_ARC4RANDOM) */
 
    return number;
 }