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124 lines
3.1 KiB
124 lines
3.1 KiB
4 months ago
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/*
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* magic.c - PPP Magic Number routines.
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*
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* Copyright (c) 1984-2000 Carnegie Mellon University. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* 3. The name "Carnegie Mellon University" must not be used to
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* endorse or promote products derived from this software without
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* prior written permission. For permission or any legal
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* details, please contact
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* Office of Technology Transfer
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* Carnegie Mellon University
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* 5000 Forbes Avenue
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* Pittsburgh, PA 15213-3890
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* (412) 268-4387, fax: (412) 268-7395
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* tech-transfer@andrew.cmu.edu
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*
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* 4. Redistributions of any form whatsoever must retain the following
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* acknowledgment:
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* "This product includes software developed by Computing Services
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* at Carnegie Mellon University (http://www.cmu.edu/computing/)."
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*
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* CARNEGIE MELLON UNIVERSITY DISCLAIMS ALL WARRANTIES WITH REGARD TO
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* THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
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* AND FITNESS, IN NO EVENT SHALL CARNEGIE MELLON UNIVERSITY BE LIABLE
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* FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN
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* AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
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* OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#define RCSID "$Id: magic.c,v 1.11 2003/06/11 23:56:26 paulus Exp $"
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <sys/types.h>
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#include <sys/time.h>
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#include "pppd.h"
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#include "magic.h"
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static const char rcsid[] = RCSID;
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extern long mrand48 __P((void));
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extern void srand48 __P((long));
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/*
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* magic_init - Initialize the magic number generator.
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*
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* Attempts to compute a random number seed which will not repeat.
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* The current method uses the current hostid, current process ID
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* and current time, currently.
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*/
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void
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magic_init()
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{
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long seed;
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struct timeval t;
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gettimeofday(&t, NULL);
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seed = get_host_seed() ^ t.tv_sec ^ t.tv_usec ^ getpid();
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srand48(seed);
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}
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/*
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* magic - Returns the next magic number.
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*/
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u_int32_t
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magic()
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{
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return (u_int32_t) mrand48();
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}
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/*
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* random_bytes - Fill a buffer with random bytes.
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*/
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void
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random_bytes(unsigned char *buf, int len)
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{
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int i;
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for (i = 0; i < len; ++i)
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buf[i] = mrand48() >> 24;
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}
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#ifdef NO_DRAND48
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/*
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* Substitute procedures for those systems which don't have
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* drand48 et al.
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*/
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double
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drand48()
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{
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return (double)random() / (double)0x7fffffffL; /* 2**31-1 */
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}
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long
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mrand48()
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{
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return random();
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}
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void
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srand48(seedval)
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long seedval;
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{
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srandom((int)seedval);
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}
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#endif
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