/* $OpenBSD: magic.c,v 1.8 2002/07/01 19:31:37 deraadt Exp $ */ /* * magic.c - PPP Magic Number routines. * * Copyright (c) 1984-2000 Carnegie Mellon University. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in * the documentation and/or other materials provided with the * distribution. * * 3. The name "Carnegie Mellon University" must not be used to * endorse or promote products derived from this software without * prior written permission. For permission or any legal * details, please contact * Office of Technology Transfer * Carnegie Mellon University * 5000 Forbes Avenue * Pittsburgh, PA 15213-3890 * (412) 268-4387, fax: (412) 268-7395 * tech-transfer@andrew.cmu.edu * * 4. Redistributions of any form whatsoever must retain the following * acknowledgment: * "This product includes software developed by Computing Services * at Carnegie Mellon University (http://www.cmu.edu/computing/)." * * CARNEGIE MELLON UNIVERSITY DISCLAIMS ALL WARRANTIES WITH REGARD TO * THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY * AND FITNESS, IN NO EVENT SHALL CARNEGIE MELLON UNIVERSITY BE LIABLE * FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN * AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */ #ifndef lint #if 0 static char rcsid[] = "Id: magic.c,v 1.7 1998/03/25 03:07:49 paulus Exp $"; #else static char rcsid[] = "$OpenBSD: magic.c,v 1.8 2002/07/01 19:31:37 deraadt Exp $"; #endif #endif #include <stdio.h> #include <unistd.h> #include <sys/types.h> #include <sys/time.h> #include <stdlib.h> #include "pppd.h" #include "magic.h" extern long mrand48(void); extern void srand48(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() { #if 0 long seed; struct timeval t; gettimeofday(&t, NULL); seed = get_host_seed() ^ t.tv_sec ^ t.tv_usec ^ getpid(); srand48(seed); #endif } /* * magic - Returns the next magic number. */ u_int32_t magic() { #if 0 return (u_int32_t) mrand48(); #else return arc4random(); #endif } #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