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/* $Id: VBoxDTraceWrapper.cpp $ */
/** @file
* VBoxDTrace - Wrapper that selects the right dtrace implemetation and adds
* our library to the search path.
*/
/*
* Copyright (C) 2016-2019 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 Common
* Development and Distribution License Version 1.0 (CDDL) only, as it
* comes in the "COPYING.CDDL" 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.
*/
/*********************************************************************************************************************************
* Header Files *
*********************************************************************************************************************************/
#include <iprt/buildconfig.h>
#include <iprt/env.h>
#include <iprt/file.h>
#include <iprt/initterm.h>
#include <iprt/ldr.h>
#include <iprt/message.h>
#include <iprt/path.h>
#include <iprt/process.h>
#include <iprt/string.h>
#include <VBox/sup.h>
#include "../../Main/include/ExtPackUtil.h"
/*********************************************************************************************************************************
* Defined Constants And Macros *
*********************************************************************************************************************************/
/** The VBoxDTrace extension pack name. */
#define VBOX_EXTPACK_VBOXDTRACE_NAME "Oracle VBoxDTrace Extension Pack"
/** The mangled version of VBOX_EXTPACK_VBOXDTRACE_NAME (also in Config.kmk). */
#define VBOX_EXTPACK_VBOXDTRACE_MANGLED_NAME "Oracle_VBoxDTrace_Extension_Pack"
/*********************************************************************************************************************************
* Structures and Typedefs *
*********************************************************************************************************************************/
/** The main function of VBoxDTrace.so/dylib/dll. */
typedef int (RTCALL *PFNVBOXDTRACEMAIN)(int argc, char **argv);
int main(int argc, char **argv)
{
/*
* Init IPRT.
*/
int rc = RTR3InitExe(argc, &argv, 0);
if (RT_FAILURE(rc))
return RTMsgInitFailure(rc);
/*
* Locate a native DTrace command binary.
*/
bool fIsNativeDTrace = false;
char szDTraceCmd[RTPATH_MAX];
szDTraceCmd[0] = '\0';
#if defined(RT_OS_DARWIN) || defined(RT_OS_FREEBSD) || defined(RT_OS_LINUX) || defined(RT_OS_SOLARIS)
/*
* 1. Try native first on platforms where it's applicable.
*/
static const char * const s_apszNativeDTrace[] =
{
"/usr/sbin/dtrace",
"/sbin/dtrace",
"/usr/bin/dtrace",
"/bin/dtrace",
"/usr/local/sbin/dtrace",
"/usr/local/bin/dtrace"
};
if (!RTEnvExist("VBOX_DTRACE_NO_NATIVE"))
for (uint32_t i = 0; i < RT_ELEMENTS(s_apszNativeDTrace); i++)
if (RTFileExists(s_apszNativeDTrace[i]))
{
fIsNativeDTrace = true;
strcpy(szDTraceCmd, s_apszNativeDTrace[i]);
# ifdef RT_OS_LINUX
/** @todo Warn if the dtrace modules haven't been loaded or vboxdrv isn't
* compiled against them. */
# endif
break;
}
if (szDTraceCmd[0] == '\0')
#endif
{
/*
* 2. VBoxDTrace extension pack installed?
*
* Note! We cannot use the COM API here because this program is usually
* run thru sudo or directly as root, even if the target
* VirtualBox process is running as regular user. This is due to
* the privileges required to run dtrace scripts on a host.
*/
rc = RTPathAppPrivateArch(szDTraceCmd, sizeof(szDTraceCmd));
if (RT_SUCCESS(rc))
rc = RTPathAppend(szDTraceCmd, sizeof(szDTraceCmd),
VBOX_EXTPACK_INSTALL_DIR RTPATH_SLASH_STR VBOX_EXTPACK_VBOXDTRACE_MANGLED_NAME);
if (RT_SUCCESS(rc))
rc = RTPathAppend(szDTraceCmd, sizeof(szDTraceCmd), RTBldCfgTargetDotArch());
if (RT_SUCCESS(rc))
rc = RTPathAppend(szDTraceCmd, sizeof(szDTraceCmd), "VBoxDTraceCmd");
if (RT_SUCCESS(rc))
rc = RTStrCat(szDTraceCmd, sizeof(szDTraceCmd), RTLdrGetSuff());
if (RT_FAILURE(rc))
return RTMsgErrorExit(RTEXITCODE_FAILURE, "Error constructing extension pack path: %Rrc", rc);
if (!RTFileExists(szDTraceCmd))
return RTMsgErrorExit(RTEXITCODE_FAILURE,
"Unable to find a DTrace implementation. VBoxDTrace Extension Pack installed?");
fIsNativeDTrace = false;
}
/*
* Construct a new command line that includes our libary.
*/
char szDTraceLibDir[RTPATH_MAX];
rc = RTPathAppPrivateNoArch(szDTraceLibDir, sizeof(szDTraceLibDir));
if (RT_SUCCESS(rc))
rc = RTPathAppend(szDTraceLibDir, sizeof(szDTraceLibDir), "dtrace" RTPATH_SLASH_STR "lib");
if (RT_SUCCESS(rc))
rc = RTPathAppend(szDTraceLibDir, sizeof(szDTraceLibDir), RTBldCfgTargetArch());
if (RT_FAILURE(rc))
return RTMsgErrorExit(RTEXITCODE_FAILURE, "Error constructing dtrace library path for VBox: %Rrc", rc);
char **papszArgs = (char **)RTMemAlloc((argc + 3) * sizeof(char *));
if (!papszArgs)
return RTMsgErrorExit(RTEXITCODE_FAILURE, "No memory for argument list.");
int cArgs = 1;
papszArgs[0] = fIsNativeDTrace ? szDTraceCmd : argv[0];
if (argc > 1)
{
papszArgs[cArgs++] = (char *)"-L";
papszArgs[cArgs++] = szDTraceLibDir;
}
for (int i = 1; i < argc; i++)
papszArgs[cArgs++] = argv[i];
papszArgs[cArgs] = NULL;
Assert(cArgs <= argc + 3);
/*
* The native DTrace we execute as a sub-process and wait for.
*/
RTEXITCODE rcExit;
if (fIsNativeDTrace)
{
RTPROCESS hProc;
rc = RTProcCreate(szDTraceCmd, papszArgs, RTENV_DEFAULT, 0, &hProc);
if (RT_SUCCESS(rc))
{
RTPROCSTATUS Status;
rc = RTProcWait(hProc, RTPROCWAIT_FLAGS_BLOCK, &Status);
if (RT_SUCCESS(rc))
{
if (Status.enmReason == RTPROCEXITREASON_NORMAL)
rcExit = (RTEXITCODE)Status.iStatus;
else
rcExit = RTEXITCODE_FAILURE;
}
else
rcExit = RTMsgErrorExit(RTEXITCODE_FAILURE, "Error waiting for child process: %Rrc", rc);
}
else
rcExit = RTMsgErrorExit(RTEXITCODE_FAILURE, "Error executing '%s': %Rrc", szDTraceCmd, rc);
}
/*
* While the VBoxDTrace we load and call the main function of.
*/
else
{
RTERRINFOSTATIC ErrInfo;
RTLDRMOD hMod;
rc = SUPR3HardenedLdrLoadPlugIn(szDTraceCmd, &hMod, RTErrInfoInitStatic(&ErrInfo));
if (RT_SUCCESS(rc))
{
PFNVBOXDTRACEMAIN pfnVBoxDTraceMain;
rc = RTLdrGetSymbol(hMod, "VBoxDTraceMain", (void **)&pfnVBoxDTraceMain);
if (RT_SUCCESS(rc))
rcExit = (RTEXITCODE)pfnVBoxDTraceMain(cArgs, papszArgs);
else
rcExit = RTMsgErrorExit(RTEXITCODE_FAILURE, "Error locating 'VBoxDTraceMain' in '%s': %Rrc", szDTraceCmd, rc);
}
else
rcExit = RTMsgErrorExit(RTEXITCODE_FAILURE, "Error loading '%s': %Rrc (%s)", szDTraceCmd, rc, ErrInfo.szMsg);
}
return rcExit;
}
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