rand.c

Apache V2.0.15 Alpha For Linuxhttpd-2_0_15-alpha.tar.Z

/* ====================================================================
 * The Apache Software License, Version 1.1
 *
 * Copyright (c) 2000-2001 The Apache Software Foundation.  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 end-user documentation included with the redistribution,
 *    if any, must include the following acknowledgment:
 *       "This product includes software developed by the
 *        Apache Software Foundation (http://www.apache.org/)."
 *    Alternately, this acknowledgment may appear in the software itself,
 *    if and wherever such third-party acknowledgments normally appear.
 *
 * 4. The names "Apache" and "Apache Software Foundation" must
 *    not be used to endorse or promote products derived from this
 *    software without prior written permission. For written
 *    permission, please contact [e-mail].
 *
 * 5. Products derived from this software may not be called "Apache",
 *    nor may "Apache" appear in their name, without prior written
 *    permission of the Apache Software Foundation.
 *
 * THIS SOFTWARE IS PROVIDED ``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 APACHE SOFTWARE FOUNDATION 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 software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Software Foundation.  For more
 * information on the Apache Software Foundation, please see
 * <http://www.apache.org/>.
 */

#include "misc.h"
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#if APR_HAVE_UNISTD_H
#include <unistd.h>
#endif

#if APR_HAS_RANDOM

#define	XSTR(x)	#x
#define	STR(x)	XSTR(x)

apr_status_t apr_generate_random_bytes(unsigned char * buf, int length) 
{
#ifdef	DEV_RANDOM

    int rnd;
    size_t got, tot;

    if ((rnd = open(STR(DEV_RANDOM), O_RDONLY)) == -1) 
	return errno;

    for (tot=0; tot<length; tot += got)
	if ((got = read(rnd, buf+tot, length-tot)) < 0) 
	    return errno;

    close(rnd);

#elif defined(OS2)
    static UCHAR randbyte();
    unsigned int idx;

    for (idx=0; idx<length; idx++)
	buf[idx] = randbyte();

#else  /* use truerand */

    extern int randbyte(void);	/* from the truerand library */
    unsigned int idx;

    /* this will increase the startup time of the server, unfortunately...
     * (generating 20 bytes takes about 8 seconds)
     */
    for (idx=0; idx<length; idx++)
	buf[idx] = (unsigned char) randbyte();

#endif	/* DEV_RANDOM */

    return APR_SUCCESS;
}

#undef	STR
#undef	XSTR

#ifdef OS2
#include "../os2/randbyte.c"
#endif

#endif /* APR_HAS_RANDOM */