/* 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) 1998-2006 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).

 *

 */

#include <stdio.h>

#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) || defined(OPENSSL_SYS_NETWARE))

# 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>

# if defined(OPENSSL_SYS_LINUX) /* should actually be available virtually

                                 * everywhere */

#  include <poll.h>

# endif

# include <limits.h>

# ifndef FD_SETSIZE

#  define FD_SETSIZE (8*sizeof(fd_set))

# endif

# if defined(OPENSSL_SYS_VOS)

/*

 * The following algorithm repeatedly samples the real-time clock (RTC) to

 * generate a sequence of unpredictable data.  The algorithm relies upon the

 * uneven execution speed of the code (due to factors such as cache misses,

 * interrupts, bus activity, and scheduling) and upon the rather large

 * relative difference between the speed of the clock and the rate at which

 * it can be read.

 *

 * If this code is ported to an environment where execution speed is more

 * constant or where the RTC ticks at a much slower rate, or the clock can be

 * read with fewer instructions, it is likely that the results would be far

 * more predictable.

 *

 * As a precaution, we generate 4 times the minimum required amount of seed

 * data.

 */

int RAND_poll(void)

{

    short int code;

    gid_t curr_gid;

    pid_t curr_pid;

    uid_t curr_uid;

    int i, k;

    struct timespec ts;

    unsigned char v;

#  ifdef OPENSSL_SYS_VOS_HPPA

    long duration;

    extern void s$sleep(long *_duration, short int *_code);

#  else

#   ifdef OPENSSL_SYS_VOS_IA32

    long long duration;

    extern void s$sleep2(long long *_duration, short int *_code);

#   else

#    error "Unsupported Platform."

#   endif                       /* OPENSSL_SYS_VOS_IA32 */

#  endif                        /* OPENSSL_SYS_VOS_HPPA */

    /*

     * Seed with the gid, pid, and uid, to ensure *some* variation between

     * different processes.

     */

    curr_gid = getgid();

    RAND_add(&curr_gid, sizeof curr_gid, 1);

    curr_gid = 0;

    curr_pid = getpid();

    RAND_add(&curr_pid, sizeof curr_pid, 1);

    curr_pid = 0;

    curr_uid = getuid();

    RAND_add(&curr_uid, sizeof curr_uid, 1);

    curr_uid = 0;

    for (i = 0; i < (ENTROPY_NEEDED * 4); i++) {

        /*

         * burn some cpu; hope for interrupts, cache collisions, bus

         * interference, etc.

         */

        for (k = 0; k < 99; k++)

            ts.tv_nsec = random();

#  ifdef OPENSSL_SYS_VOS_HPPA

        /* sleep for 1/1024 of a second (976 us).  */

        duration = 1;

        s$sleep(&duration, &code);

#  else

#   ifdef OPENSSL_SYS_VOS_IA32

        /* sleep for 1/65536 of a second (15 us).  */

        duration = 1;

        s$sleep2(&duration, &code);

#   endif                       /* OPENSSL_SYS_VOS_IA32 */

#  endif                        /* OPENSSL_SYS_VOS_HPPA */

        /* get wall clock time.  */

        clock_gettime(CLOCK_REALTIME, &ts);

        /* take 8 bits */

        v = (unsigned char)(ts.tv_nsec % 256);

        RAND_add(&v, sizeof v, 1);

        v = 0;

    }

    return 1;

}

# elif defined __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);

    OPENSSL_cleanse(buf, sizeof(buf));

    return 1;

}

# else                          /* !defined(__OpenBSD__) */

int 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;

    unsigned int 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) {

            int usec = 10 * 1000; /* spend 10ms on each file */

            int r;

            unsigned int j;

            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 {

                int try_read = 0;

#   if defined(OPENSSL_SYS_BEOS_R5)

                /*

                 * select() is broken in BeOS R5, so we simply try to read

                 * something and snooze if we couldn't

                 */

                try_read = 1;

#   elif defined(OPENSSL_SYS_LINUX)

                /* use poll() */

                struct pollfd pset;

                pset.fd = fd;

                pset.events = POLLIN;

                pset.revents = 0;

                if (poll(&pset, 1, usec / 1000) < 0)

                    usec = 0;

                else

                    try_read = (pset.revents & POLLIN) != 0;

#   else

                /* use select() */

                fd_set fset;

                struct timeval t;

                t.tv_sec = 0;

                t.tv_usec = usec;

                if (FD_SETSIZE > 0 && (unsigned)fd >= FD_SETSIZE) {

                    /*

                     * can't use select, so just try to read once anyway

                     */

                    try_read = 1;

                } else {

                    FD_ZERO(&fset);

                    FD_SET(fd, &fset);

                    if (select(fd + 1, &fset, NULL, NULL, &t) >= 0) {

                        usec = t.tv_usec;

                        if (FD_ISSET(fd, &fset))

                            try_read = 1;

                    } else

                        usec = 0;

                }

#   endif

                if (try_read) {

                    r = read(fd, (unsigned char *)tmpbuf + n,

                             ENTROPY_NEEDED - n);

                    if (r > 0)

                        n += r;

#   if defined(OPENSSL_SYS_BEOS_R5)

                    if (r == 0)

                        snooze(t.tv_usec);

#   endif

                } else

                    r = -1;

                /*

                 * Some Unixen will update t in select(), some won't.  For

                 * those who won't, or if we didn't use select() in the first

                 * place, give up here, otherwise, we will do this once again

                 * for the remaining time.

                 */

                if (usec == 10 * 1000)

                    usec = 0;

            }

            while ((r > 0 ||

                    (errno == EINTR || errno == EAGAIN)) && usec != 0

                   && n < ENTROPY_NEEDED);

            close(fd);

        }

    }

#  endif                        /* defined(DEVRANDOM) */

#  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                        /* defined(DEVRANDOM_EGD) */

#  if defined(DEVRANDOM) || defined(DEVRANDOM_EGD)

    if (n > 0) {

        RAND_add(tmpbuf, sizeof tmpbuf, (double)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), 0.0);

    l = getuid();

    RAND_add(&l, sizeof(l), 0.0);

    l = time(NULL);

    RAND_add(&l, sizeof(l), 0.0);

#  if defined(OPENSSL_SYS_BEOS)

    {

        system_info sysInfo;

        get_system_info(&sysInfo);

        RAND_add(&sysInfo, sizeof(sysInfo), 0);

    }

#  endif

#  if defined(DEVRANDOM) || defined(DEVRANDOM_EGD)

    return 1;

#  else

    return 0;

#  endif

}

# endif                         /* defined(__OpenBSD__) */

#endif                          /* !(defined(OPENSSL_SYS_WINDOWS) ||

                                 * defined(OPENSSL_SYS_WIN32) ||

                                 * defined(OPENSSL_SYS_VMS) ||

                                 * defined(OPENSSL_SYS_OS2) ||

                                 * defined(OPENSSL_SYS_VXWORKS) ||

                                 * defined(OPENSSL_SYS_NETWARE)) */

#if defined(OPENSSL_SYS_VXWORKS)

int RAND_poll(void)

{

    return 0;

}

#endif