examples: adding seed-by-clock

2 files changed, 231 insertions, 1 deletions

diff --git a/Makefile.am b/Makefile.am
index c10a08d..4ff1eca 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -86,7 +86,8 @@ pkgdata_DATA				=
 rfcdoc_DATA                             =
 sbin_SCRIPTS                            =
 sbin_PROGRAMS                           =
-EXTRA_PROGRAMS                          = examples/socket-example \
+EXTRA_PROGRAMS                          = examples/seed-by-clock \
+                                          examples/socket-example \
                                           tests/test-array-sorted \
                                           tests/test-array-stack \
                                           tests/test-array-queue \
@@ -189,6 +190,7 @@ if ENABLE_DOCUMENATION
    rfcdoc_DATA                          += doc/rfc/rfc8044.txt
 endif
 if ENABLE_EXAMPLES
+   noinst_PROGRAMS                      += examples/seed-by-clock
    noinst_PROGRAMS                      += examples/socket-example
 endif
 if ENABLE_LIBTINYRAD
@@ -221,6 +223,10 @@ if ENABLE_TINYRAD_COMMON
 endif
 
 
+# macros for examples/seed-by-clock
+examples_seed_by_clock_SOURCES          = examples/seed-by-clock.c
+
+
 # macros for examples/socket-example
 examples_socket_example_SOURCES         = examples/socket-example.c
 
diff --git a/examples/seed-by-clock.c b/examples/seed-by-clock.c
new file mode 100644
index 0000000..4ea6b8f
--- /dev/null
+++ b/examples/seed-by-clock.c
@@ -0,0 +1,224 @@
+/*
+ *  Tiny RADIUS Client Library
+ *  Copyright (C) 2022 David M. Syzdek <david@syzdek.net>.
+ *  All rights reserved.
+ *
+ *  Redistribution and use in source and binary forms, with or without
+ *  modification, are permitted provided that the following conditions are
+ *  met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ *       notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above copyright
+ *       notice, this list of conditions and the following disclaimer in the
+ *       documentation and/or other materials provided with the distribution.
+ *     * Neither the name of David M. Syzdek nor the
+ *       names of its contributors may be used to endorse or promote products
+ *       derived from this software without specific prior written permission.
+ *
+ *  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
+ *  IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
+ *  THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ *  PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL DAVID M. SYZDEK BE LIABLE FOR
+ *  ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ *  DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ *  SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ *  CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ *  LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ *  OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ *  SUCH DAMAGE.
+ */
+#define _SRC_SEED_BY_CLOCK_C 1
+
+///////////////
+//           //
+//  Headers  //
+//           //
+///////////////
+#pragma mark - Headers
+
+//#include <tinyrad_compat.h>
+
+#ifdef HAVE_CONFIG_H
+#   include "config.h"
+#endif
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <time.h>
+#include <getopt.h>
+
+
+///////////////////
+//               //
+//  Definitions  //
+//               //
+///////////////////
+#pragma mark - Definitions
+
+#undef PROGRAM_NAME
+#define PROGRAM_NAME "seed-by-clock"
+#ifndef PACKAGE_BUGREPORT
+#   define PACKAGE_BUGREPORT "unknown"
+#endif
+#ifndef PACKAGE_COPYRIGHT
+#   define PACKAGE_COPYRIGHT "unknown"
+#endif
+#ifndef PACKAGE_NAME
+#   define PACKAGE_NAME "Tiny RADIUS Client Library"
+#endif
+#ifndef PACKAGE_VERSION
+#   define PACKAGE_VERSION "unknown"
+#endif
+
+#undef _U
+#define _U( num ) ((unsigned) num )
+
+
+//////////////////
+//              //
+//  Prototypes  //
+//              //
+//////////////////
+#pragma mark - Prototypes
+
+int main( int argc, char * argv[] );
+
+
+/////////////////
+//             //
+//  Functions  //
+//             //
+/////////////////
+#pragma mark - Functions
+
+int main( int argc, char * argv[] )
+{
+   int               c;
+   int               opt_index;
+   unsigned          rnd;
+   unsigned          tmp;
+   struct timespec   ts_rt1;
+   struct timespec   ts_mono;
+   struct timespec   ts_cpu;
+   struct timespec   ts_comb;
+
+   // getopt options
+   static char          short_opt[] = "hqVv";
+   static struct option long_opt[] =
+   {
+      {"help",             no_argument,       NULL, 'h' },
+      {"quiet",            no_argument,       NULL, 'q' },
+      {"silent",           no_argument,       NULL, 'q' },
+      {"version",          no_argument,       NULL, 'V' },
+      {"verbose",          no_argument,       NULL, 'v' },
+      { NULL, 0, NULL, 0 }
+   };
+
+   while((c = getopt_long(argc, argv, short_opt, long_opt, &opt_index)) != -1)
+   {
+      switch(c)
+      {
+         case -1:       /* no more arguments */
+         case 0:        /* long options toggles */
+         break;
+
+         case 'h':
+         printf("Usage: %s [OPTIONS]\n", PROGRAM_NAME);
+         printf("Options:\n");
+         printf("  -h, --help                                print this help and exit\n");
+         printf("  -q, --quiet, --silent                     do not print messages\n");
+         printf("  -V, --version                             print version number and exit\n");
+         printf("  -v, --verbose                             print verbose messages\n");
+         printf("\n");
+         return(0);
+
+         case 'q':
+         break;
+
+         case 'V':
+         printf("%s (%s) %s\n", PROGRAM_NAME, PACKAGE_NAME, PACKAGE_VERSION);
+         return(0);
+
+         case 'v':
+         break;
+
+         case '?':
+         fprintf(stderr, "Try `%s --help' for more information.\n", PROGRAM_NAME);
+         return(1);
+
+         default:
+         fprintf(stderr, "%s: unrecognized option `--%c'\n", PROGRAM_NAME, c);
+         fprintf(stderr, "Try `%s --help' for more information.\n", PROGRAM_NAME);
+         return(1);
+      };
+   };
+
+   // read initial clocks
+   clock_gettime(CLOCK_REALTIME,           &ts_rt1);
+   clock_gettime(CLOCK_MONOTONIC,          &ts_mono);
+   clock_gettime(CLOCK_PROCESS_CPUTIME_ID, &ts_cpu);
+
+   // add seconds and nanoseconds
+   ts_comb.tv_sec   = ts_rt1.tv_sec  + ts_mono.tv_sec  + ts_cpu.tv_sec;
+   ts_comb.tv_nsec  = ts_rt1.tv_nsec + ts_mono.tv_nsec + ts_cpu.tv_nsec;
+   rnd              = (unsigned)(ts_comb.tv_sec + ts_comb.tv_nsec);
+   tmp              = rnd;
+
+   // reverse bits
+   rnd = ((rnd & 0xffff0000) >> 16) | ((rnd & 0x0000ffff) << 16);
+   rnd = ((rnd & 0xff00ff00) >>  8) | ((rnd & 0x00ff00ff) <<  8);
+   rnd = ((rnd & 0xf0f0f0f0) >>  4) | ((rnd & 0x0f0f0f0f) <<  4);
+   rnd = ((rnd & 0xcccccccc) >>  2) | ((rnd & 0x33333333) <<  2);
+   rnd = ((rnd & 0xaaaaaaaa) >>  1) | ((rnd & 0x55555555) <<  1);
+
+   // print initial results
+   printf("Round 1:\n");
+   printf("   realtime:   %08x  %08x\n", (unsigned)ts_rt1.tv_sec,  (unsigned)ts_rt1.tv_nsec);
+   printf("   monotonic:  %08x  %08x\n", (unsigned)ts_mono.tv_sec, (unsigned)ts_mono.tv_nsec);
+   printf("   cputime:    %08x  %08x\n", (unsigned)ts_cpu.tv_sec,  (unsigned)ts_cpu.tv_nsec);
+   printf("   combined:   %08x  %08x\n", (unsigned)ts_comb.tv_sec, (unsigned)ts_comb.tv_nsec);
+   printf("   rnd:        %08x\n",       tmp);
+   printf("   rnd (rev):  %08x\n",       rnd);
+
+   // read clocks second time
+   clock_gettime(CLOCK_REALTIME,           &ts_rt1);
+   clock_gettime(CLOCK_MONOTONIC,          &ts_mono);
+   clock_gettime(CLOCK_PROCESS_CPUTIME_ID, &ts_cpu);
+
+   // add seconds and nanoseconds to initial result
+   ts_comb.tv_sec   = ts_rt1.tv_sec  + ts_mono.tv_sec  + ts_cpu.tv_sec;
+   ts_comb.tv_nsec  = ts_rt1.tv_nsec + ts_mono.tv_nsec + ts_cpu.tv_nsec;
+   rnd             += (unsigned)(ts_comb.tv_sec + ts_comb.tv_nsec);
+
+   // print final results
+   printf("\n");
+   printf("Round 2:\n");
+   printf("   realtime:   %08x  %08x\n", (unsigned)ts_rt1.tv_sec,  (unsigned)ts_rt1.tv_nsec);
+   printf("   monotonic:  %08x  %08x\n", (unsigned)ts_mono.tv_sec, (unsigned)ts_mono.tv_nsec);
+   printf("   cputime:    %08x  %08x\n", (unsigned)ts_cpu.tv_sec,  (unsigned)ts_cpu.tv_nsec);
+   printf("   combined:   %08x  %08x\n", (unsigned)ts_comb.tv_sec, (unsigned)ts_comb.tv_nsec);
+   printf("   rnd:        %08x\n",       rnd);
+
+   // seed random number generator
+   srandom(rnd);
+
+   // print random numbers
+   printf("\n");
+   printf("psuedo random numbers:\n");
+   for(c = 0; (c < 14); c++)
+   {
+      printf(
+         "     %08x  %08x  %08x  %08x  %08x  %08x  %08x\n",
+         (unsigned)random(), (unsigned)random(),
+         (unsigned)random(), (unsigned)random(),
+         (unsigned)random(), (unsigned)random(),
+         (unsigned)random()
+      );
+   };
+
+   return(0);
+}
+
+
+/* end of source */