diff options
Diffstat (limited to 'src/VBox/Runtime/r3/posix/rand-posix.cpp')
| -rw-r--r-- | src/VBox/Runtime/r3/posix/rand-posix.cpp | 148 |
1 files changed, 148 insertions, 0 deletions
diff --git a/src/VBox/Runtime/r3/posix/rand-posix.cpp b/src/VBox/Runtime/r3/posix/rand-posix.cpp new file mode 100644 index 00000000..191e3db8 --- /dev/null +++ b/src/VBox/Runtime/r3/posix/rand-posix.cpp @@ -0,0 +1,148 @@ +/* $Id: rand-posix.cpp $ */ +/** @file + * IPRT - Random Numbers and Byte Streams, POSIX. + */ + +/* + * Copyright (C) 2006-2023 Oracle and/or its affiliates. + * + * This file is part of VirtualBox base platform packages, as + * available from https://www.virtualbox.org. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation, in version 3 of the + * License. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, see <https://www.gnu.org/licenses>. + * + * The contents of this file may alternatively be used under the terms + * of the Common Development and Distribution License Version 1.0 + * (CDDL), a copy of it is provided in the "COPYING.CDDL" file included + * in the VirtualBox 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. + * + * SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0 + */ + + +/********************************************************************************************************************************* +* 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"); +} + |