/* $Id: VBoxGuestR3Lib.cpp 28800 2010-04-27 08:22:32Z vboxsync $ */ /** @file * VBoxGuestR3Lib - Ring-3 Support Library for VirtualBox guest additions, Core. */ /* * Copyright (C) 2007 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 * *******************************************************************************/ #if defined(RT_OS_WINDOWS) # include #elif defined(RT_OS_OS2) # define INCL_BASE # define INCL_ERRORS # include #elif defined(RT_OS_FREEBSD) \ || defined(RT_OS_LINUX) \ || defined(RT_OS_SOLARIS) # include # include # if defined(RT_OS_LINUX) /** @todo check this on solaris+freebsd as well. */ # include # endif # include # include #endif #include #include #include #include #include #include #include #include "VBGLR3Internal.h" #ifdef VBOX_VBGLR3_XFREE86 /* Rather than try to resolve all the header file conflicts, I will just prototype what we need here. */ # define XF86_O_RDWR 0x0002 typedef void *pointer; extern "C" int xf86open(const char *, int, ...); extern "C" int xf86close(int); extern "C" int xf86ioctl(int, unsigned long, pointer); #endif /******************************************************************************* * Global Variables * *******************************************************************************/ /** The VBoxGuest device handle. */ #ifdef VBOX_VBGLR3_XFREE86 static int g_File = -1; #elif defined(RT_OS_WINDOWS) static HANDLE g_hFile = INVALID_HANDLE_VALUE; #else static RTFILE g_File = NIL_RTFILE; #endif /** User counter. * A counter of the number of times the library has been initialised, for use with * X.org drivers, where the library may be shared by multiple independant modules * inside a single process space. */ static uint32_t volatile g_cInits = 0; /** * Implementation of VbglR3Init and VbglR3InitUser */ static int vbglR3Init(const char *pszDeviceName) { uint32_t cInits = ASMAtomicIncU32(&g_cInits); Assert(cInits > 0); if (cInits > 1) { /* * This will fail if two (or more) threads race each other calling VbglR3Init. * However it will work fine for single threaded or otherwise serialized * processed calling us more than once. */ #ifdef RT_OS_WINDOWS if (g_hFile == INVALID_HANDLE_VALUE) #elif !defined (VBOX_VBGLR3_XFREE86) if (g_File == NIL_RTFILE) #else if (g_File == -1) #endif return VERR_INTERNAL_ERROR; return VINF_SUCCESS; } #if defined(RT_OS_WINDOWS) if (g_hFile != INVALID_HANDLE_VALUE) #elif !defined(VBOX_VBGLR3_XFREE86) if (g_File != NIL_RTFILE) #else if (g_File != -1) #endif return VERR_INTERNAL_ERROR; #if defined(RT_OS_WINDOWS) /* * Have to use CreateFile here as we want to specify FILE_FLAG_OVERLAPPED * and possible some other bits not availble thru iprt/file.h. */ HANDLE hFile = CreateFile(pszDeviceName, GENERIC_READ | GENERIC_WRITE, FILE_SHARE_READ | FILE_SHARE_WRITE, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL | FILE_FLAG_OVERLAPPED, NULL); if (hFile == INVALID_HANDLE_VALUE) return VERR_OPEN_FAILED; g_hFile = hFile; #elif defined(RT_OS_OS2) /* * We might wish to compile this with Watcom, so stick to * the OS/2 APIs all the way. And in any case we have to use * DosDevIOCtl for the requests, why not use Dos* for everything. */ HFILE hf = NULLHANDLE; ULONG ulAction = 0; APIRET rc = DosOpen((PCSZ)pszDeviceName, &hf, &ulAction, 0, FILE_NORMAL, OPEN_ACTION_OPEN_IF_EXISTS, OPEN_FLAGS_FAIL_ON_ERROR | OPEN_FLAGS_NOINHERIT | OPEN_SHARE_DENYNONE | OPEN_ACCESS_READWRITE, NULL); if (rc) return RTErrConvertFromOS2(rc); if (hf < 16) { HFILE ahfs[16]; unsigned i; for (i = 0; i < RT_ELEMENTS(ahfs); i++) { ahfs[i] = 0xffffffff; rc = DosDupHandle(hf, &ahfs[i]); if (rc) break; } if (i-- > 1) { ULONG fulState = 0; rc = DosQueryFHState(ahfs[i], &fulState); if (!rc) { fulState |= OPEN_FLAGS_NOINHERIT; fulState &= OPEN_FLAGS_WRITE_THROUGH | OPEN_FLAGS_FAIL_ON_ERROR | OPEN_FLAGS_NO_CACHE | OPEN_FLAGS_NOINHERIT; /* Turn off non-participating bits. */ rc = DosSetFHState(ahfs[i], fulState); } if (!rc) { rc = DosClose(hf); AssertMsg(!rc, ("%ld\n", rc)); hf = ahfs[i]; } else i++; while (i-- > 0) DosClose(ahfs[i]); } } g_File = hf; #elif defined(VBOX_VBGLR3_XFREE86) int File = xf86open(pszDeviceName, XF86_O_RDWR); if (File == -1) return VERR_OPEN_FAILED; g_File = File; #else /* The default implemenation. (linux, solaris, freebsd) */ RTFILE File; int rc = RTFileOpen(&File, pszDeviceName, RTFILE_O_READWRITE | RTFILE_O_OPEN | RTFILE_O_DENY_NONE); if (RT_FAILURE(rc)) return rc; g_File = File; #endif #ifndef VBOX_VBGLR3_XFREE86 /* * Create release logger */ PRTLOGGER pReleaseLogger; static const char * const s_apszGroups[] = VBOX_LOGGROUP_NAMES; int rc2 = RTLogCreate(&pReleaseLogger, 0, "all", "VBOX_RELEASE_LOG", RT_ELEMENTS(s_apszGroups), &s_apszGroups[0], RTLOGDEST_USER, NULL); /* This may legitimately fail if we are using the mini-runtime. */ if (RT_SUCCESS(rc2)) RTLogRelSetDefaultInstance(pReleaseLogger); #endif return VINF_SUCCESS; } /** * Open the VBox R3 Guest Library. This should be called by system daemons * and processes. */ VBGLR3DECL(int) VbglR3Init(void) { return vbglR3Init(VBOXGUEST_DEVICE_NAME); } /** * Open the VBox R3 Guest Library. Equivalent to VbglR3Init, but for user * session processes. */ VBGLR3DECL(int) VbglR3InitUser(void) { return vbglR3Init(VBOXGUEST_USER_DEVICE_NAME); } VBGLR3DECL(void) VbglR3Term(void) { /* * Decrement the reference count and see if we're the last one out. */ uint32_t cInits = ASMAtomicDecU32(&g_cInits); if (cInits > 0) return; #if !defined(VBOX_VBGLR3_XFREE86) AssertReturnVoid(!cInits); # if defined(RT_OS_WINDOWS) HANDLE hFile = g_hFile; g_hFile = INVALID_HANDLE_VALUE; AssertReturnVoid(hFile != INVALID_HANDLE_VALUE); BOOL fRc = CloseHandle(hFile); Assert(fRc); NOREF(fRc); # elif defined(RT_OS_OS2) RTFILE File = g_File; g_File = NIL_RTFILE; AssertReturnVoid(File != NIL_RTFILE); APIRET rc = DosClose(File); AssertMsg(!rc, ("%ld\n", rc)); # else /* The IPRT case. */ RTFILE File = g_File; g_File = NIL_RTFILE; AssertReturnVoid(File != NIL_RTFILE); int rc = RTFileClose(File); AssertRC(rc); # endif #else /* VBOX_VBGLR3_XFREE86 */ int File = g_File; g_File = -1; if (File == -1) return; xf86close(File); #endif /* VBOX_VBGLR3_XFREE86 */ } /** * Internal wrapper around various OS specific ioctl implemenations. * * @returns VBox status code as returned by VBoxGuestCommonIOCtl, or * an failure returned by the OS specific ioctl APIs. * * @param iFunction The requested function. * @param pvData The input and output data buffer. * @param cbData The size of the buffer. * * @remark Exactly how the VBoxGuestCommonIOCtl is ferried back * here is OS specific. On BSD and Darwin we can use errno, * while on OS/2 we use the 2nd buffer of the IOCtl. */ int vbglR3DoIOCtl(unsigned iFunction, void *pvData, size_t cbData) { #if defined(RT_OS_WINDOWS) DWORD cbReturned = 0; if (!DeviceIoControl(g_hFile, iFunction, pvData, (DWORD)cbData, pvData, (DWORD)cbData, &cbReturned, NULL)) { /** @todo The passing of error codes needs to be tested and fixed (as does *all* the other hosts except for * OS/2). The idea is that the VBox status codes in ring-0 should be transfered without loss down to * ring-3. However, it's not vitally important right now (obviously, since the other guys has been * ignoring it for 1+ years now). On Linux and Solaris the transfer is done, but it is currently not * lossless, so still needs fixing. */ DWORD LastErr = GetLastError(); return RTErrConvertFromWin32(LastErr); } return VINF_SUCCESS; #elif defined(RT_OS_OS2) ULONG cbOS2Parm = cbData; int32_t vrc = VERR_INTERNAL_ERROR; ULONG cbOS2Data = sizeof(vrc); APIRET rc = DosDevIOCtl(g_File, VBOXGUEST_IOCTL_CATEGORY, iFunction, pvData, cbData, &cbOS2Parm, &vrc, sizeof(vrc), &cbOS2Data); if (RT_LIKELY(!rc)) return vrc; return RTErrConvertFromOS2(rc); #elif defined(RT_OS_SOLARIS) || defined(RT_OS_FREEBSD) VBGLBIGREQ Hdr; Hdr.u32Magic = VBGLBIGREQ_MAGIC; Hdr.cbData = cbData; Hdr.pvDataR3 = pvData; # if HC_ARCH_BITS == 32 Hdr.u32Padding = 0; # endif /** @todo test status code passing! Check that the kernel doesn't do any * error checks using specific errno values, and just pass an VBox * error instead of an errno.h one. Alternatively, extend/redefine the * header with an error code return field (much better alternative * actually). */ int rc = ioctl((int)g_File, iFunction, &Hdr); if (rc == -1) { rc = errno; return RTErrConvertFromErrno(rc); } return VINF_SUCCESS; #elif defined(RT_OS_LINUX) # ifdef VBOX_VBGLR3_XFREE86 int rc = xf86ioctl((int)g_File, iFunction, pvData); # else int rc = ioctl((int)g_File, iFunction, pvData); # endif if (RT_LIKELY(rc == 0)) return VINF_SUCCESS; /* Positive values are negated VBox error status codes. */ if (rc > 0) rc = -rc; else # ifdef VBOX_VBGLR3_XFREE86 rc = VERR_FILE_IO_ERROR; # else rc = RTErrConvertFromErrno(errno); # endif NOREF(cbData); return rc; #elif defined(VBOX_VBGLR3_XFREE86) /* PORTME - This is preferred over the RTFileIOCtl variant below, just be careful with the (int). */ /** @todo test status code passing! */ int rc = xf86ioctl(g_File, iFunction, pvData); if (rc == -1) return VERR_FILE_IO_ERROR; /* This is purely legacy stuff, it has to work and no more. */ return VINF_SUCCESS; #else /* Default implementation - PORTME: Do not use this without testings that passing errors works! */ /** @todo test status code passing! */ int rc2 = VERR_INTERNAL_ERROR; int rc = RTFileIoCtl(g_File, (int)iFunction, pvData, cbData, &rc2); if (RT_SUCCESS(rc)) rc = rc2; return rc; #endif }