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/* $Id: rand-posix.cpp $ */
/** @file
* IPRT - Random Numbers and Byte Streams, POSIX.
*/
/*
* Copyright (C) 2006-2020 Oracle Corporation
*
* This file is part of VirtualBox Open Source Edition (OSE), as
* available from http://www.virtualbox.org. This file is free software;
* you can redistribute it and/or modify it under the terms of the GNU
* General Public License (GPL) as published by the Free Software
* Foundation, in version 2 as it comes in the "COPYING" file of the
* VirtualBox OSE distribution. VirtualBox OSE is distributed in the
* hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
*
* The contents of this file may alternatively be used under the terms
* of the Common Development and Distribution License Version 1.0
* (CDDL) only, as it comes in the "COPYING.CDDL" file of the
* VirtualBox OSE distribution, in which case the provisions of the
* CDDL are applicable instead of those of the GPL.
*
* You may elect to license modified versions of this file under the
* terms and conditions of either the GPL or the CDDL or both.
*/
/*********************************************************************************************************************************
* Header Files *
*********************************************************************************************************************************/
#include <errno.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <sys/ioctl.h>
#include <fcntl.h>
#ifdef _MSC_VER
# include <io.h>
# include <stdio.h>
#else
# include <unistd.h>
# include <sys/time.h>
#endif
#include <iprt/rand.h>
#include <iprt/mem.h>
#include <iprt/errcore.h>
#include <iprt/assert.h>
#include "internal/rand.h"
#include "internal/magics.h"
/** @copydoc RTRANDINT::pfnGetBytes */
static DECLCALLBACK(void) rtRandAdvPosixGetBytes(PRTRANDINT pThis, uint8_t *pb, size_t cb)
{
ssize_t cbRead = read(pThis->u.File.hFile, pb, cb);
if ((size_t)cbRead != cb)
{
/* S10 has been observed returning 1040 bytes at the time from /dev/urandom.
Which means we need to do than 256 rounds to reach 668171 bytes if
that's what demanded by the caller (like tstRTMemWipe.cpp). */
ssize_t cTries = RT_MAX(256, cb / 64);
do
{
if (cbRead > 0)
{
cb -= cbRead;
pb += cbRead;
}
cbRead = read(pThis->u.File.hFile, pb, cb);
} while ( (size_t)cbRead != cb
&& cTries-- > 0);
AssertReleaseMsg((size_t)cbRead == cb, ("%zu != %zu, cTries=%zd errno=%d\n", cbRead, cb, cTries, errno));
}
}
/** @copydoc RTRANDINT::pfnDestroy */
static DECLCALLBACK(int) rtRandAdvPosixDestroy(PRTRANDINT pThis)
{
pThis->u32Magic = ~RTRANDINT_MAGIC;
int fd = pThis->u.File.hFile;
pThis->u.File.hFile = -1;
RTMemFree(pThis);
close(fd);
return VINF_SUCCESS;
}
static int rtRandAdvPosixCreateSystem(PRTRAND phRand, const char *pszDev) RT_NO_THROW_DEF
{
/*
* Try open it first and then setup the handle structure.
*/
int fd = open(pszDev, O_RDONLY);
if (fd < 0)
return RTErrConvertFromErrno(errno);
int rc;
if (fcntl(fd, F_SETFD, FD_CLOEXEC) != -1)
{
PRTRANDINT pThis = (PRTRANDINT)RTMemAlloc(sizeof(*pThis));
if (pThis)
{
pThis->u32Magic = RTRANDINT_MAGIC;
pThis->pfnGetBytes = rtRandAdvPosixGetBytes;
pThis->pfnGetU32 = rtRandAdvSynthesizeU32FromBytes;
pThis->pfnGetU64 = rtRandAdvSynthesizeU64FromBytes;
pThis->pfnSeed = rtRandAdvStubSeed;
pThis->pfnSaveState = rtRandAdvStubSaveState;
pThis->pfnRestoreState = rtRandAdvStubRestoreState;
pThis->pfnDestroy = rtRandAdvPosixDestroy;
pThis->u.File.hFile = fd;
*phRand = pThis;
return VINF_SUCCESS;
}
/* bail out */
rc = VERR_NO_MEMORY;
}
else
rc = RTErrConvertFromErrno(errno);
close(fd);
return rc;
}
RTDECL(int) RTRandAdvCreateSystemFaster(PRTRAND phRand) RT_NO_THROW_DEF
{
return rtRandAdvPosixCreateSystem(phRand, "/dev/urandom");
}
RTDECL(int) RTRandAdvCreateSystemTruer(PRTRAND phRand) RT_NO_THROW_DEF
{
return rtRandAdvPosixCreateSystem(phRand, "/dev/random");
}
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