/* crypto/rand/rand_unix.c *//* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) * All rights reserved. * * This package is an SSL implementation written * by Eric Young (eay@cryptsoft.com). * The implementation was written so as to conform with Netscapes SSL. *  * This library is free for commercial and non-commercial use as long as * the following conditions are aheared to.  The following conditions * apply to all code found in this distribution, be it the RC4, RSA, * lhash, DES, etc., code; not just the SSL code.  The SSL documentation * included with this distribution is covered by the same copyright terms * except that the holder is Tim Hudson (tjh@cryptsoft.com). *  * Copyright remains Eric Young's, and as such any Copyright notices in * the code are not to be removed. * If this package is used in a product, Eric Young should be given attribution * as the author of the parts of the library used. * This can be in the form of a textual message at program startup or * in documentation (online or textual) provided with the package. *  * 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 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. All advertising materials mentioning features or use of this software *    must display the following acknowledgement: *    "This product includes cryptographic software written by *     Eric Young (eay@cryptsoft.com)" *    The word 'cryptographic' can be left out if the rouines from the library *    being used are not cryptographic related :-). * 4. If you include any Windows specific code (or a derivative thereof) from  *    the apps directory (application code) you must include an acknowledgement: *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" *  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. *  * The licence and distribution terms for any publically available version or * derivative of this code cannot be changed.  i.e. this code cannot simply be * copied and put under another distribution licence * [including the GNU Public Licence.] *//* ==================================================================== * Copyright (c) 1998-2000 The OpenSSL Project.  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. All advertising materials mentioning features or use of this *    software must display the following acknowledgment: *    "This product includes software developed by the OpenSSL Project *    for use in the OpenSSL Toolkit. (http://www.openssl.org/)" * * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to *    endorse or promote products derived from this software without *    prior written permission. For written permission, please contact *    openssl-core@openssl.org. * * 5. Products derived from this software may not be called "OpenSSL" *    nor may "OpenSSL" appear in their names without prior written *    permission of the OpenSSL Project. * * 6. Redistributions of any form whatsoever must retain the following *    acknowledgment: *    "This product includes software developed by the OpenSSL Project *    for use in the OpenSSL Toolkit (http://www.openssl.org/)" * * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED * OF THE POSSIBILITY OF SUCH DAMAGE. * ==================================================================== * * This product includes cryptographic software written by Eric Young * (eay@cryptsoft.com).  This product includes software written by Tim * Hudson (tjh@cryptsoft.com). * */#define USE_SOCKETS#include "e_os.h"#include "cryptlib.h"#include <openssl/rand.h>#include "rand_lcl.h"#if !(defined(OPENSSL_SYS_WINDOWS) || defined(OPENSSL_SYS_WIN32) || defined(OPENSSL_SYS_VMS) || defined(OPENSSL_SYS_OS2) || defined(OPENSSL_SYS_VXWORKS))#include <sys/types.h>#include <sys/time.h>#include <sys/times.h>#include <sys/stat.h>#include <fcntl.h>#include <unistd.h>#include <time.h>#ifdef __OpenBSD__int RAND_poll(void){	u_int32_t rnd = 0, i;	unsigned char buf[ENTROPY_NEEDED];	for (i = 0; i < sizeof(buf); i++) {		if (i % 4 == 0)			rnd = arc4random();		buf[i] = rnd;		rnd >>= 8;	}	RAND_add(buf, sizeof(buf), ENTROPY_NEEDED);	memset(buf, 0, sizeof(buf));	return 1;}#elseint RAND_poll(void){	unsigned long l;	pid_t curr_pid = getpid();#if defined(DEVRANDOM) || defined(DEVRANDOM_EGD)	unsigned char tmpbuf[ENTROPY_NEEDED];	int n = 0;#endif#ifdef DEVRANDOM	static const char *randomfiles[] = { DEVRANDOM };	struct stat randomstats[sizeof(randomfiles)/sizeof(randomfiles[0])];	int fd,i;#endif#ifdef DEVRANDOM_EGD	static const char *egdsockets[] = { DEVRANDOM_EGD, NULL };	const char **egdsocket = NULL;#endif#ifdef DEVRANDOM	memset(randomstats,0,sizeof(randomstats));	/* Use a random entropy pool device. Linux, FreeBSD and OpenBSD	 * have this. Use /dev/urandom if you can as /dev/random may block	 * if it runs out of random entries.  */	for (i=0; i<sizeof(randomfiles)/sizeof(randomfiles[0]) && n < ENTROPY_NEEDED; i++)		{		if ((fd = open(randomfiles[i], O_RDONLY#ifdef O_NONBLOCK			|O_NONBLOCK#endif#ifdef O_BINARY			|O_BINARY#endif#ifdef O_NOCTTY /* If it happens to be a TTY (god forbid), do not make it		   our controlling tty */			|O_NOCTTY#endif			)) >= 0)			{			struct timeval t = { 0, 10*1000 }; /* Spend 10ms on							      each file. */			int r,j;			fd_set fset;			struct stat *st=&randomstats[i];			/* Avoid using same input... Used to be O_NOFOLLOW			 * above, but it's not universally appropriate... */			if (fstat(fd,st) != 0)	{ close(fd); continue; }			for (j=0;j<i;j++)				{				if (randomstats[j].st_ino==st->st_ino &&				    randomstats[j].st_dev==st->st_dev)					break;				}			if (j<i)		{ close(fd); continue; }			do				{				FD_ZERO(&fset);				FD_SET(fd, &fset);				r = -1;				if (select(fd+1,&fset,NULL,NULL,&t) < 0)					t.tv_usec=0;				else if (FD_ISSET(fd, &fset))					{					r=read(fd,(unsigned char *)tmpbuf+n,					       ENTROPY_NEEDED-n);					if (r > 0)						n += r;					}				/* Some Unixen will update t, some				   won't.  For those who won't, give				   up here, otherwise, we will do				   this once again for the remaining				   time. */				if (t.tv_usec == 10*1000)					t.tv_usec=0;				}			while ((r > 0 || (errno == EINTR || errno == EAGAIN))				&& t.tv_usec != 0 && n < ENTROPY_NEEDED);			close(fd);			}		}#endif#ifdef DEVRANDOM_EGD	/* Use an EGD socket to read entropy from an EGD or PRNGD entropy	 * collecting daemon. */	for (egdsocket = egdsockets; *egdsocket && n < ENTROPY_NEEDED; egdsocket++)		{		int r;		r = RAND_query_egd_bytes(*egdsocket, (unsigned char *)tmpbuf+n,					 ENTROPY_NEEDED-n);		if (r > 0)			n += r;		}#endif#if defined(DEVRANDOM) || defined(DEVRANDOM_EGD)	if (n > 0)		{		RAND_add(tmpbuf,sizeof tmpbuf,n);		OPENSSL_cleanse(tmpbuf,n);		}#endif	/* put in some default random data, we need more than just this */	l=curr_pid;	RAND_add(&l,sizeof(l),0);	l=getuid();	RAND_add(&l,sizeof(l),0);	l=time(NULL);	RAND_add(&l,sizeof(l),0);#if defined(DEVRANDOM) || defined(DEVRANDOM_EGD)	return 1;#else	return 0;#endif}#endif#endif#if defined(OPENSSL_SYS_VXWORKS)int RAND_poll(void){    return 0;}#endif