/*      $NetBSD: magic.c,v 1.6 2025/01/08 19:59:39 christos Exp $       */

/*
* magic.c - PPP Magic Number routines.
*
* Copyright (c) 1984-2000 Carnegie Mellon University. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
*    notice, this list of conditions and the following disclaimer.
*
* 2. 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.
*
* 3. The name "Carnegie Mellon University" must not be used to
*    endorse or promote products derived from this software without
*    prior written permission. For permission or any legal
*    details, please contact
*      Office of Technology Transfer
*      Carnegie Mellon University
*      5000 Forbes Avenue
*      Pittsburgh, PA  15213-3890
*      (412) 268-4387, fax: (412) 268-7395
*      [email protected]
*
* 4. Redistributions of any form whatsoever must retain the following
*    acknowledgment:
*    "This product includes software developed by Computing Services
*     at Carnegie Mellon University (http://www.cmu.edu/computing/)."
*
* CARNEGIE MELLON UNIVERSITY DISCLAIMS ALL WARRANTIES WITH REGARD TO
* THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
* AND FITNESS, IN NO EVENT SHALL CARNEGIE MELLON UNIVERSITY BE LIABLE
* FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN
* AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
* OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/

#include <sys/cdefs.h>
__RCSID("$NetBSD: magic.c,v 1.6 2025/01/08 19:59:39 christos Exp $");

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/time.h>

#include "pppd-private.h"
#include "magic.h"


extern long mrand48 (void);
extern void srand48 (long);

/*
* magic_init - Initialize the magic number generator.
*
* Attempts to compute a random number seed which will not repeat.
* The current method uses the current hostid, current process ID
* and current time, currently.
*/
void
magic_init(void)
{
   long seed;
   struct timeval t;

   gettimeofday(&t, NULL);
   seed = get_host_seed() ^ t.tv_sec ^ t.tv_usec ^ getpid();
   srand48(seed);
}

/*
* magic - Returns the next magic number.
*/
u_int32_t
magic(void)
{
   return (u_int32_t) mrand48();
}

/*
* random_bytes - Fill a buffer with random bytes.
*/
void
random_bytes(unsigned char *buf, int len)
{
       int i;

       for (i = 0; i < len; ++i)
               buf[i] = mrand48() >> 24;
}

#ifdef NO_DRAND48
/*
* Substitute procedures for those systems which don't have
* drand48 et al.
*/

double
drand48(void)
{
   return (double)random() / (double)0x7fffffffL; /* 2**31-1 */
}

long
mrand48(void)
{
   return random();
}

void
srand48(long seedval)
{
   srandom((int)seedval);
}

#endif