VirtualBox

source: vbox/trunk/src/VBox/Runtime/r3/posix/rand-posix.cpp@ 22509

Last change on this file since 22509 was 11557, checked in by vboxsync, 16 years ago

iprt: RTRandAdvCreateNonPseudo -> RTRandAdvCreateSystemFaster; RTRandAdvCreatePureNonPseudo -> RTRandAdvCreateSystemTruer

  • Property svn:eol-style set to native
  • Property svn:keywords set to Id
File size: 4.2 KB
Line 
1/* $Id: rand-posix.cpp 11557 2008-08-21 21:47:31Z vboxsync $ */
2/** @file
3 * IPRT - Random Numbers and Byte Streams, POSIX.
4 */
5
6/*
7 * Copyright (C) 2006-2007 Sun Microsystems, Inc.
8 *
9 * This file is part of VirtualBox Open Source Edition (OSE), as
10 * available from http://www.virtualbox.org. This file is free software;
11 * you can redistribute it and/or modify it under the terms of the GNU
12 * General Public License (GPL) as published by the Free Software
13 * Foundation, in version 2 as it comes in the "COPYING" file of the
14 * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
15 * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
16 *
17 * The contents of this file may alternatively be used under the terms
18 * of the Common Development and Distribution License Version 1.0
19 * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
20 * VirtualBox OSE distribution, in which case the provisions of the
21 * CDDL are applicable instead of those of the GPL.
22 *
23 * You may elect to license modified versions of this file under the
24 * terms and conditions of either the GPL or the CDDL or both.
25 *
26 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa
27 * Clara, CA 95054 USA or visit http://www.sun.com if you need
28 * additional information or have any questions.
29 */
30
31
32/*******************************************************************************
33* Header Files *
34*******************************************************************************/
35#include <errno.h>
36#include <sys/stat.h>
37#include <sys/types.h>
38#include <sys/ioctl.h>
39#include <sys/fcntl.h>
40#include <fcntl.h>
41#ifdef _MSC_VER
42# include <io.h>
43# include <stdio.h>
44#else
45# include <unistd.h>
46# include <sys/time.h>
47#endif
48
49#include <iprt/rand.h>
50#include <iprt/mem.h>
51#include <iprt/err.h>
52#include <iprt/assert.h>
53#include "internal/rand.h"
54#include "internal/magics.h"
55
56
57
58/** @copydoc RTRANDINT::pfnGetBytes */
59static DECLCALLBACK(void) rtRandAdvPosixGetBytes(PRTRANDINT pThis, uint8_t *pb, size_t cb)
60{
61 ssize_t cbRead = read(pThis->u.File.hFile, pb, cb);
62 if ((size_t)cbRead != cb)
63 {
64 ssize_t cTries = RT_MIN(cb, 256);
65 do
66 {
67 if (cbRead > 0)
68 {
69 cb -= cbRead;
70 pb += cbRead;
71 }
72 cbRead = read(pThis->u.File.hFile, pb, cb);
73 } while ( (size_t)cbRead != cb
74 && cTries-- > 0);
75 AssertReleaseMsg((size_t)cbRead == cb, ("%zu != %zu, cTries=%zd errno=%d\n", cbRead, cb, cTries, errno));
76 }
77}
78
79
80/** @copydoc RTRANDINT::pfnDestroy */
81static DECLCALLBACK(int) rtRandAdvPosixDestroy(PRTRANDINT pThis)
82{
83 pThis->u32Magic = ~RTRANDINT_MAGIC;
84 int fd = pThis->u.File.hFile;
85 pThis->u.File.hFile = NIL_RTFILE;
86 RTMemFree(pThis);
87 close(fd);
88 return VINF_SUCCESS;
89}
90
91
92static int rtRandAdvPosixCreateSystem(PRTRAND phRand, const char *pszDev) RT_NO_THROW
93{
94 /*
95 * Try open it first and then setup the handle structure.
96 */
97 int fd = open(pszDev, O_RDONLY);
98 if (fd < 0)
99 return RTErrConvertFromErrno(errno);
100 int rc;
101 if (fcntl(fd, F_SETFD, FD_CLOEXEC) != -1)
102 {
103 PRTRANDINT pThis = (PRTRANDINT)RTMemAlloc(sizeof(*pThis));
104 if (pThis)
105 {
106 pThis->u32Magic = RTRANDINT_MAGIC;
107 pThis->pfnGetBytes = rtRandAdvPosixGetBytes;
108 pThis->pfnGetU32 = rtRandAdvSynthesizeU32FromBytes;
109 pThis->pfnGetU64 = rtRandAdvSynthesizeU64FromBytes;
110 pThis->pfnSeed = rtRandAdvStubSeed;
111 pThis->pfnSaveState = rtRandAdvStubSaveState;
112 pThis->pfnRestoreState = rtRandAdvStubRestoreState;
113 pThis->pfnDestroy = rtRandAdvPosixDestroy;
114 pThis->u.File.hFile = fd;
115
116 *phRand = pThis;
117 return VINF_SUCCESS;
118 }
119
120 /* bail out */
121 rc = VERR_NO_MEMORY;
122 }
123 else
124 rc = RTErrConvertFromErrno(errno);
125 close(fd);
126 return rc;
127}
128
129
130RTDECL(int) RTRandAdvCreateSystemFaster(PRTRAND phRand) RT_NO_THROW
131{
132 return rtRandAdvPosixCreateSystem(phRand, "/dev/urandom");
133}
134
135
136RTDECL(int) RTRandAdvCreateSystemTruer(PRTRAND phRand) RT_NO_THROW
137{
138 return rtRandAdvPosixCreateSystem(phRand, "/dev/random");
139}
140
141
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