| 1 | /* $Id: rand-posix.cpp 8245 2008-04-21 17:24:28Z vboxsync $ */
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| 2 | /** @file
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| 3 | * IPRT - Random Numbers and Byte Streams, POSIX.
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| 4 | */
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| 5 |
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| 6 | /*
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| 7 | * Copyright (C) 2006-2007 Sun Microsystems, Inc.
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| 8 | *
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| 9 | * This file is part of VirtualBox Open Source Edition (OSE), as
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| 10 | * available from http://www.virtualbox.org. This file is free software;
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| 11 | * you can redistribute it and/or modify it under the terms of the GNU
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| 12 | * General Public License (GPL) as published by the Free Software
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| 13 | * Foundation, in version 2 as it comes in the "COPYING" file of the
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| 14 | * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
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| 15 | * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
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| 16 | *
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| 17 | * The contents of this file may alternatively be used under the terms
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| 18 | * of the Common Development and Distribution License Version 1.0
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| 19 | * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
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| 20 | * VirtualBox OSE distribution, in which case the provisions of the
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| 21 | * CDDL are applicable instead of those of the GPL.
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| 22 | *
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| 23 | * You may elect to license modified versions of this file under the
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| 24 | * terms and conditions of either the GPL or the CDDL or both.
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| 25 | *
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| 26 | * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa
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| 27 | * Clara, CA 95054 USA or visit http://www.sun.com if you need
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| 28 | * additional information or have any questions.
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| 29 | */
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| 30 |
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| 31 |
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| 32 | /*******************************************************************************
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| 33 | * Header Files *
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| 34 | *******************************************************************************/
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| 35 | #include <errno.h>
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| 36 | #include <sys/stat.h>
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| 37 | #include <sys/types.h>
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| 38 | #include <sys/ioctl.h>
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| 39 | #include <sys/fcntl.h>
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| 40 | #include <fcntl.h>
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| 41 | #ifdef _MSC_VER
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| 42 | # include <io.h>
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| 43 | # include <stdio.h>
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| 44 | #else
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| 45 | # include <unistd.h>
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| 46 | # include <sys/time.h>
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| 47 | #endif
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| 48 |
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| 49 | #include <iprt/rand.h>
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| 50 | #include <iprt/err.h>
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| 51 | #include <iprt/assert.h>
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| 52 | #include "internal/rand.h"
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| 53 |
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| 54 |
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| 55 | /*******************************************************************************
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| 56 | * Global Variables *
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| 57 | *******************************************************************************/
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| 58 | /** File handle of /dev/random. */
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| 59 | static int g_fhDevRandom = -1;
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| 60 |
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| 61 |
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| 62 | void rtRandLazyInitNative(void)
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| 63 | {
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| 64 | if (g_fhDevRandom != -1)
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| 65 | return;
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| 66 |
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| 67 | int fh = open("/dev/urandom", O_RDONLY);
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| 68 | if (fh <= 0)
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| 69 | fh = open("/dev/random", O_RDONLY | O_NONBLOCK);
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| 70 | if (fh >= 0)
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| 71 | {
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| 72 | fcntl(fh, F_SETFD, FD_CLOEXEC);
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| 73 | g_fhDevRandom = fh;
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| 74 | }
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| 75 | }
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| 76 |
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| 77 |
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| 78 | int rtRandGenBytesNative(void *pv, size_t cb)
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| 79 | {
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| 80 | int fh = g_fhDevRandom;
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| 81 | if (fh == -1)
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| 82 | return VERR_NOT_SUPPORTED;
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| 83 |
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| 84 | ssize_t cbRead = read(fh, pv, cb);
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| 85 | if ((size_t)cbRead != cb)
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| 86 | {
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| 87 | /*
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| 88 | * Use the fallback for the remainder if /dev/urandom / /dev/random
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| 89 | * is out to lunch.
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| 90 | */
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| 91 | if (cbRead <= 0)
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| 92 | rtRandGenBytesFallback(pv, cb);
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| 93 | else
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| 94 | {
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| 95 | AssertRelease((size_t)cbRead < cb);
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| 96 | rtRandGenBytesFallback((uint8_t *)pv + cbRead, cb - cbRead);
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| 97 | }
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| 98 | }
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| 99 | return VINF_SUCCESS;
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| 100 | }
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| 101 |
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