1 /* $OpenBSD: magic.c,v 1.8 2002/07/01 19:31:37 deraadt Exp $ */ 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 #ifndef lint 46 #if 0 47 static char rcsid[] = "Id: magic.c,v 1.7 1998/03/25 03:07:49 paulus Exp $"; 48 #else 49 static char rcsid[] = "$OpenBSD: magic.c,v 1.8 2002/07/01 19:31:37 deraadt Exp $"; 50 #endif 51 #endif 52 53 #include <stdio.h> 54 #include <unistd.h> 55 #include <sys/types.h> 56 #include <sys/time.h> 57 #include <stdlib.h> 58 59 #include "pppd.h" 60 #include "magic.h" 61 62 extern long mrand48(void); 63 extern void srand48(long); 64 65 /* 66 * magic_init - Initialize the magic number generator. 67 * 68 * Attempts to compute a random number seed which will not repeat. 69 * The current method uses the current hostid, current process ID 70 * and current time, currently. 71 */ 72 void 73 magic_init() 74 { 75 #if 0 76 long seed; 77 struct timeval t; 78 79 gettimeofday(&t, NULL); 80 seed = get_host_seed() ^ t.tv_sec ^ t.tv_usec ^ getpid(); 81 srand48(seed); 82 #endif 83 } 84 85 /* 86 * magic - Returns the next magic number. 87 */ 88 u_int32_t 89 magic() 90 { 91 #if 0 92 return (u_int32_t) mrand48(); 93 #else 94 return arc4random(); 95 #endif 96 } 97 98 #ifdef NO_DRAND48 99 /* 100 * Substitute procedures for those systems which don't have 101 * drand48 et al. 102 */ 103 104 double 105 drand48() 106 { 107 return (double)random() / (double)0x7fffffffL; /* 2**31-1 */ 108 } 109 110 long 111 mrand48() 112 { 113 return random(); 114 } 115 116 void 117 srand48(seedval) 118 long seedval; 119 { 120 srandom((int)seedval); 121 } 122 123 #endif 124