NetBSD/usr.sbin/pppd/magic.c

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/* $NetBSD: magic.c,v 1.5 1997/03/12 20:17:59 christos Exp $ */
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/*
* magic.c - PPP Magic Number routines.
*
* Copyright (c) 1989 Carnegie Mellon University.
* All rights reserved.
*
* Redistribution and use in source and binary forms are permitted
* provided that the above copyright notice and this paragraph are
* duplicated in all such forms and that any documentation,
* advertising materials, and other materials related to such
* distribution and use acknowledge that the software was developed
* by Carnegie Mellon University. The name of the
* University may not be used to endorse or promote products derived
* from this software without specific prior written permission.
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
* WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*/
#ifndef lint
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#if 0
static char rcsid[] = "Id: magic.c,v 1.6 1996/04/04 03:58:41 paulus Exp ";
#else
static char rcsid[] = "$NetBSD: magic.c,v 1.5 1997/03/12 20:17:59 christos Exp $";
#endif
#endif
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#include <stdio.h>
#include <unistd.h>
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#include <sys/types.h>
#include <sys/time.h>
#include "pppd.h"
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#include "magic.h"
extern long mrand48 __P((void));
extern void srand48 __P((long));
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/*
* 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.
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*/
void
magic_init()
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{
long seed;
struct timeval t;
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gettimeofday(&t, NULL);
seed = gethostid() ^ t.tv_sec ^ t.tv_usec ^ getpid();
srand48(seed);
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}
/*
* magic - Returns the next magic number.
*/
u_int32_t
magic()
{
return (u_int32_t) mrand48();
}
#ifdef NO_DRAND48
/*
* Substitute procedures for those systems which don't have
* drand48 et al.
*/
double
drand48()
{
return (double)random() / (double)0x7fffffffL; /* 2**31-1 */
}
long
mrand48()
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{
return random();
}
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void
srand48(seedval)
long seedval;
{
srandom((int)seedval);
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}
#endif