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/*********************************************************
* Copyright (C) 2006 VMware, Inc. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as published
* by the Free Software Foundation version 2.1 and no later version.
*
* 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 Lesser GNU General Public
* License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
*********************************************************/
/*
* vmcheck.c --
*
* Utility functions for discovering our virtualization status.
*/
#ifdef __cplusplus
extern "C" {
#endif
#include <stdlib.h>
#include "vmware.h"
#include "vm_version.h"
#include "vm_tools_version.h"
#include "backdoor.h"
#include "backdoor_def.h"
#include "debug.h"
#if !defined(_WIN32) && !defined(N_PLAT_NLM)
# include "vmsignal.h"
# include "setjmp.h"
#endif
#if !defined(_WIN32) && !defined(N_PLAT_NLM)
static sigjmp_buf jmpBuf;
static Bool jmpIsSet;
/*
*----------------------------------------------------------------------
*
* VmCheckSegvHandler --
*
* Signal handler for segv. Return to the program state saved
* by a previous call to sigsetjmp, or Panic if sigsetjmp hasn't
* been called yet. This function never returns;
*
* Return Value:
* None.
*
* Side effects:
* See the manpage for sigsetjmp for details.
*
*----------------------------------------------------------------------
*/
static void
VmCheckSegvHandler(int clientData) // UNUSED
{
if (jmpIsSet) {
siglongjmp(jmpBuf, 1);
} else {
Panic("Recieved SEGV, exiting");
}
}
#endif
/*
*----------------------------------------------------------------------
*
* VmCheck_GetVersion --
*
* Retrieve the version of VMware that's running on the
* other side of the backdoor.
*
* Return value:
* TRUE on success
* *version contains the VMX version
* *type contains the VMX type
* FALSE on failure
*
* Side effects:
* None
*
*----------------------------------------------------------------------
*/
Bool
VmCheck_GetVersion(uint32 *version, // OUT
uint32 *type) // OUT
{
Backdoor_proto bp;
ASSERT(version);
ASSERT(type);
/* Make sure EBX does not contain BDOOR_MAGIC */
bp.in.size = ~BDOOR_MAGIC;
/* Make sure ECX does not contain any known VMX type */
bp.in.cx.halfs.high = 0xFFFF;
bp.in.cx.halfs.low = BDOOR_CMD_GETVERSION;
Backdoor(&bp);
if (bp.out.ax.word == 0xFFFFFFFF) {
/*
* No backdoor device there. This code is not executing in a VMware
* virtual machine. --hpreg
*/
return FALSE;
}
if (bp.out.bx.word != BDOOR_MAGIC) {
return FALSE;
}
*version = bp.out.ax.word;
/*
* Old VMXs (workstation and express) didn't set their type. In that case,
* our special pattern will still be there. --hpreg
*/
/*
* Need to expand this out since the toolchain's gcc doesn't like mixing
* integral types and enums in the same trinary operator.
*/
if (bp.in.cx.halfs.high == 0xFFFF)
*type = VMX_TYPE_UNSET;
else
*type = bp.out.cx.word;
return TRUE;
}
/*
*----------------------------------------------------------------------
*
* VmCheck_IsVirtualWorld --
*
* Verify that we're running in a VM & we're version compatible with our
* environment.
*
* Return value:
* TRUE if we're in a virtual machine, FALSE otherwise.
*
* Side effects:
* None.
*
*----------------------------------------------------------------------
*/
Bool
VmCheck_IsVirtualWorld(void)
{
uint32 version;
uint32 dummy;
#ifdef N_PLAT_NLM
/*
* We are running at CPL0. So we'll not receive SIGSEGV on access
* and we must do it other way... --petr
*/
if (!VmCheck_GetVersion(&version, &dummy)) {
return FALSE;
}
#elif defined _WIN32
__try {
VmCheck_GetVersion(&version, &dummy);
} __except (GetExceptionCode() == STATUS_PRIVILEGED_INSTRUCTION) {
return FALSE;
}
#else // POSIX
int signals[] = {
SIGSEGV,
};
struct sigaction olds[ARRAYSIZE(signals)];
if (Signal_SetGroupHandler(signals, olds, ARRAYSIZE(signals),
VmCheckSegvHandler) == 0) {
exit(1);
}
if (sigsetjmp(jmpBuf, TRUE) == 0) {
jmpIsSet = TRUE;
VmCheck_GetVersion(&version, &dummy);
} else {
jmpIsSet = FALSE;
return FALSE;
}
if (Signal_ResetGroupHandler(signals, olds, ARRAYSIZE(signals)) == 0) {
exit(1);
}
#endif
if (version != VERSION_MAGIC) {
Debug("The version of this program is incompatible with your %s.\n"
"For information on updating your VMware Tools please see\n"
"http://www.vmware.com/info?id=99\n"
"\n", PRODUCT_LINE_NAME);
return FALSE;
}
return TRUE;
}
#ifdef __cplusplus
}
#endif
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