1 files changed, 138 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..1709aad9
--- /dev/null
+++ b/src/VBox/Runtime/r3/posix/rand-posix.cpp
@@ -0,0 +1,138 @@
+/* $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");
+}
+