mirror of
https://git.FreeBSD.org/src.git
synced 2024-12-29 12:03:03 +00:00
88 lines
1.9 KiB
C
88 lines
1.9 KiB
C
/*
|
|
* 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
|
|
static char rcsid[] = "$FreeBSD$";
|
|
#endif
|
|
|
|
#include <stdio.h>
|
|
#include <unistd.h>
|
|
#include <sys/types.h>
|
|
#include <sys/time.h>
|
|
|
|
#include "pppd.h"
|
|
#include "magic.h"
|
|
|
|
extern long mrand48 __P((void));
|
|
extern void srand48 __P((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()
|
|
{
|
|
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()
|
|
{
|
|
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()
|
|
{
|
|
return random();
|
|
}
|
|
|
|
void
|
|
srand48(seedval)
|
|
long seedval;
|
|
{
|
|
srandom((int)seedval);
|
|
}
|
|
|
|
#endif
|