1/* $NetBSD$ */ 2 3/* 4 * magic.c - PPP Magic Number routines. 5 * 6 * Copyright (c) 1984-2000 Carnegie Mellon University. All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in 17 * the documentation and/or other materials provided with the 18 * distribution. 19 * 20 * 3. The name "Carnegie Mellon University" must not be used to 21 * endorse or promote products derived from this software without 22 * prior written permission. For permission or any legal 23 * details, please contact 24 * Office of Technology Transfer 25 * Carnegie Mellon University 26 * 5000 Forbes Avenue 27 * Pittsburgh, PA 15213-3890 28 * (412) 268-4387, fax: (412) 268-7395 29 * tech-transfer@andrew.cmu.edu 30 * 31 * 4. Redistributions of any form whatsoever must retain the following 32 * acknowledgment: 33 * "This product includes software developed by Computing Services 34 * at Carnegie Mellon University (http://www.cmu.edu/computing/)." 35 * 36 * CARNEGIE MELLON UNIVERSITY DISCLAIMS ALL WARRANTIES WITH REGARD TO 37 * THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY 38 * AND FITNESS, IN NO EVENT SHALL CARNEGIE MELLON UNIVERSITY BE LIABLE 39 * FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 40 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN 41 * AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING 42 * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 43 */ 44 45#include <sys/cdefs.h> 46#ifndef lint 47#if 0 48#define RCSID "Id: magic.c,v 1.11 2003/06/11 23:56:26 paulus Exp" 49#else 50__RCSID("$NetBSD$"); 51#endif 52#endif 53 54#include <stdio.h> 55#include <stdlib.h> 56#include <unistd.h> 57#include <sys/types.h> 58#include <sys/time.h> 59 60#include "pppd.h" 61#include "magic.h" 62 63#ifdef RCSID 64static const char rcsid[] = RCSID; 65#endif 66 67extern long mrand48 __P((void)); 68extern void srand48 __P((long)); 69 70/* 71 * magic_init - Initialize the magic number generator. 72 * 73 * Attempts to compute a random number seed which will not repeat. 74 * The current method uses the current hostid, current process ID 75 * and current time, currently. 76 */ 77void 78magic_init() 79{ 80 long seed; 81 struct timeval t; 82 83 gettimeofday(&t, NULL); 84 seed = get_host_seed() ^ t.tv_sec ^ t.tv_usec ^ getpid(); 85 srand48(seed); 86} 87 88/* 89 * magic - Returns the next magic number. 90 */ 91u_int32_t 92magic() 93{ 94 return (u_int32_t) mrand48(); 95} 96 97/* 98 * random_bytes - Fill a buffer with random bytes. 99 */ 100void 101random_bytes(unsigned char *buf, int len) 102{ 103 int i; 104 105 for (i = 0; i < len; ++i) 106 buf[i] = mrand48() >> 24; 107} 108 109#ifdef NO_DRAND48 110/* 111 * Substitute procedures for those systems which don't have 112 * drand48 et al. 113 */ 114 115double 116drand48() 117{ 118 return (double)random() / (double)0x7fffffffL; /* 2**31-1 */ 119} 120 121long 122mrand48() 123{ 124 return random(); 125} 126 127void 128srand48(seedval) 129long seedval; 130{ 131 srandom((int)seedval); 132} 133 134#endif 135