| 1 | /* $Id: rand-posix.cpp 76553 2019-01-01 01:45:53Z 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) 2006-2019 Oracle Corporation
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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 |
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| 27 |
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| 28 | /*********************************************************************************************************************************
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| 29 | * Header Files *
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| 30 | *********************************************************************************************************************************/
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| 31 | #include <errno.h>
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| 32 | #include <sys/stat.h>
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| 33 | #include <sys/types.h>
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| 34 | #include <sys/ioctl.h>
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| 35 | #include <fcntl.h>
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| 36 | #ifdef _MSC_VER
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| 37 | # include <io.h>
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| 38 | # include <stdio.h>
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| 39 | #else
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| 40 | # include <unistd.h>
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| 41 | # include <sys/time.h>
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| 42 | #endif
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| 43 |
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| 44 | #include <iprt/rand.h>
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| 45 | #include <iprt/mem.h>
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| 46 | #include <iprt/errcore.h>
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| 47 | #include <iprt/assert.h>
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| 48 | #include "internal/rand.h"
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| 49 | #include "internal/magics.h"
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| 50 |
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| 51 |
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| 52 |
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| 53 | /** @copydoc RTRANDINT::pfnGetBytes */
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| 54 | static DECLCALLBACK(void) rtRandAdvPosixGetBytes(PRTRANDINT pThis, uint8_t *pb, size_t cb)
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| 55 | {
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| 56 | ssize_t cbRead = read(pThis->u.File.hFile, pb, cb);
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| 57 | if ((size_t)cbRead != cb)
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| 58 | {
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| 59 | /* S10 has been observed returning 1040 bytes at the time from /dev/urandom.
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| 60 | Which means we need to do than 256 rounds to reach 668171 bytes if
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| 61 | that's what demanded by the caller (like tstRTMemWipe.cpp). */
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| 62 | ssize_t cTries = RT_MAX(256, cb / 64);
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| 63 | do
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| 64 | {
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| 65 | if (cbRead > 0)
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| 66 | {
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| 67 | cb -= cbRead;
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| 68 | pb += cbRead;
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| 69 | }
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| 70 | cbRead = read(pThis->u.File.hFile, pb, cb);
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| 71 | } while ( (size_t)cbRead != cb
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| 72 | && cTries-- > 0);
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| 73 | AssertReleaseMsg((size_t)cbRead == cb, ("%zu != %zu, cTries=%zd errno=%d\n", cbRead, cb, cTries, errno));
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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 | /** @copydoc RTRANDINT::pfnDestroy */
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| 79 | static DECLCALLBACK(int) rtRandAdvPosixDestroy(PRTRANDINT pThis)
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| 80 | {
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| 81 | pThis->u32Magic = ~RTRANDINT_MAGIC;
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| 82 | int fd = pThis->u.File.hFile;
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| 83 | pThis->u.File.hFile = -1;
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| 84 | RTMemFree(pThis);
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| 85 | close(fd);
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| 86 | return VINF_SUCCESS;
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| 87 | }
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| 88 |
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| 89 |
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| 90 | static int rtRandAdvPosixCreateSystem(PRTRAND phRand, const char *pszDev) RT_NO_THROW_DEF
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| 91 | {
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| 92 | /*
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| 93 | * Try open it first and then setup the handle structure.
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| 94 | */
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| 95 | int fd = open(pszDev, O_RDONLY);
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| 96 | if (fd < 0)
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| 97 | return RTErrConvertFromErrno(errno);
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| 98 | int rc;
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| 99 | if (fcntl(fd, F_SETFD, FD_CLOEXEC) != -1)
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| 100 | {
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| 101 | PRTRANDINT pThis = (PRTRANDINT)RTMemAlloc(sizeof(*pThis));
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| 102 | if (pThis)
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| 103 | {
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| 104 | pThis->u32Magic = RTRANDINT_MAGIC;
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| 105 | pThis->pfnGetBytes = rtRandAdvPosixGetBytes;
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| 106 | pThis->pfnGetU32 = rtRandAdvSynthesizeU32FromBytes;
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| 107 | pThis->pfnGetU64 = rtRandAdvSynthesizeU64FromBytes;
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| 108 | pThis->pfnSeed = rtRandAdvStubSeed;
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| 109 | pThis->pfnSaveState = rtRandAdvStubSaveState;
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| 110 | pThis->pfnRestoreState = rtRandAdvStubRestoreState;
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| 111 | pThis->pfnDestroy = rtRandAdvPosixDestroy;
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| 112 | pThis->u.File.hFile = fd;
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| 113 |
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| 114 | *phRand = pThis;
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| 115 | return VINF_SUCCESS;
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| 116 | }
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| 117 |
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| 118 | /* bail out */
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| 119 | rc = VERR_NO_MEMORY;
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| 120 | }
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| 121 | else
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| 122 | rc = RTErrConvertFromErrno(errno);
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| 123 | close(fd);
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| 124 | return rc;
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| 125 | }
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| 126 |
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| 127 |
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| 128 | RTDECL(int) RTRandAdvCreateSystemFaster(PRTRAND phRand) RT_NO_THROW_DEF
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| 129 | {
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| 130 | return rtRandAdvPosixCreateSystem(phRand, "/dev/urandom");
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| 131 | }
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| 132 |
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| 133 |
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| 134 | RTDECL(int) RTRandAdvCreateSystemTruer(PRTRAND phRand) RT_NO_THROW_DEF
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| 135 | {
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| 136 | return rtRandAdvPosixCreateSystem(phRand, "/dev/random");
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| 137 | }
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| 138 |
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