/* $Id: VBoxGuestR0LibIdc.cpp $ */ /** @file * VBoxGuestLib - Ring-0 Support Library for VBoxGuest, IDC. */ /* * Copyright (C) 2008-2019 Oracle Corporation * * Permission is hereby granted, free of charge, to any person * obtaining a copy of this software and associated documentation * files (the "Software"), to deal in the Software without * restriction, including without limitation the rights to use, * copy, modify, merge, publish, distribute, sublicense, and/or sell * copies of the Software, and to permit persons to whom the * Software is furnished to do so, subject to the following * conditions: * * The above copyright notice and this permission notice shall be * included in all copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR * OTHER DEALINGS IN THE SOFTWARE. */ /********************************************************************************************************************************* * Header Files * *********************************************************************************************************************************/ #include "VBoxGuestR0LibInternal.h" #include #include /*#include */ #ifdef VBGL_VBOXGUEST # error "This file shouldn't be part of the VBoxGuestR0LibBase library that is linked into VBoxGuest. It's client code." #endif /********************************************************************************************************************************* * Global Variables * *********************************************************************************************************************************/ /*static PVBGLIDCHANDLE volatile g_pMainHandle = NULL;*/ /** * Opens the IDC interface of the support driver. * * This will perform basic version negotiations and fail if the * minimum requirements aren't met. * * @returns VBox status code. * @param pHandle The handle structure (output). * @param uReqVersion The requested version. Pass 0 for default. * @param uMinVersion The minimum required version. Pass 0 for default. * @param puSessionVersion Where to store the session version. Optional. * @param puDriverVersion Where to store the session version. Optional. * @param puDriverRevision Where to store the SVN revision of the driver. Optional. */ DECLR0VBGL(int) VbglR0IdcOpen(PVBGLIDCHANDLE pHandle, uint32_t uReqVersion, uint32_t uMinVersion, uint32_t *puSessionVersion, uint32_t *puDriverVersion, uint32_t *puDriverRevision) { unsigned uDefaultMinVersion; VBGLIOCIDCCONNECT Req; int rc; /* * Validate and set failure return values. */ AssertPtrReturn(pHandle, VERR_INVALID_POINTER); pHandle->s.pvSession = NULL; AssertPtrNullReturn(puSessionVersion, VERR_INVALID_POINTER); if (puSessionVersion) *puSessionVersion = 0; AssertPtrNullReturn(puDriverVersion, VERR_INVALID_POINTER); if (puDriverVersion) *puDriverVersion = 0; AssertPtrNullReturn(puDriverRevision, VERR_INVALID_POINTER); if (puDriverRevision) *puDriverRevision = 0; AssertReturn(!uMinVersion || (uMinVersion & UINT32_C(0xffff0000)) == (VBGL_IOC_VERSION & UINT32_C(0xffff0000)), VERR_INVALID_PARAMETER); AssertReturn(!uReqVersion || (uReqVersion & UINT32_C(0xffff0000)) == (VBGL_IOC_VERSION & UINT32_C(0xffff0000)), VERR_INVALID_PARAMETER); /* * Handle default version input and enforce minimum requirements made * by this library. * * The clients will pass defaults (0), and only in the case that some * special API feature was just added will they set an actual version. * So, this is the place where can easily enforce a minimum IDC version * on bugs and similar. It corresponds a bit to what SUPR3Init is * responsible for. */ uDefaultMinVersion = VBGL_IOC_VERSION & UINT32_C(0xffff0000); if (!uMinVersion || uMinVersion < uDefaultMinVersion) uMinVersion = uDefaultMinVersion; if (!uReqVersion || uReqVersion < uDefaultMinVersion) uReqVersion = uDefaultMinVersion; /* * Setup the connect request packet and call the OS specific function. */ VBGLREQHDR_INIT(&Req.Hdr, IDC_CONNECT); Req.u.In.u32MagicCookie = VBGL_IOCTL_IDC_CONNECT_MAGIC_COOKIE; Req.u.In.uMinVersion = uMinVersion; Req.u.In.uReqVersion = uReqVersion; Req.u.In.uReserved = 0; rc = vbglR0IdcNativeOpen(pHandle, &Req); if (RT_SUCCESS(rc)) rc = Req.Hdr.rc; if (RT_SUCCESS(rc)) { pHandle->s.pvSession = Req.u.Out.pvSession; if (puSessionVersion) *puSessionVersion = Req.u.Out.uSessionVersion; if (puDriverVersion) *puDriverVersion = Req.u.Out.uDriverVersion; if (puDriverRevision) *puDriverRevision = Req.u.Out.uDriverRevision; /* * We don't really trust anyone, make sure the returned * session and version values actually makes sense. */ if ( RT_VALID_PTR(Req.u.Out.pvSession) && Req.u.Out.uSessionVersion >= uMinVersion && (Req.u.Out.uSessionVersion & UINT32_C(0xffff0000)) == (VBGL_IOC_VERSION & UINT32_C(0xffff0000))) { /*ASMAtomicCmpXchgPtr(&g_pMainHandle, pHandle, NULL);*/ return rc; } AssertMsgFailed(("pSession=%p uSessionVersion=0x%x (r%u)\n", Req.u.Out.pvSession, Req.u.Out.uSessionVersion, Req.u.Out.uDriverRevision)); rc = VERR_VERSION_MISMATCH; VbglR0IdcClose(pHandle); } return rc; } /** * Closes a IDC connection established by VbglR0IdcOpen. * * @returns VBox status code. * @param pHandle The IDC handle. */ DECLR0VBGL(int) VbglR0IdcClose(PVBGLIDCHANDLE pHandle) { VBGLIOCIDCDISCONNECT Req; int rc; /* * Catch closed handles and check that the session is valid. */ AssertPtrReturn(pHandle, VERR_INVALID_POINTER); if (!pHandle->s.pvSession) return VERR_INVALID_HANDLE; AssertPtrReturn(pHandle->s.pvSession, VERR_INVALID_HANDLE); /* * Create the request and hand it to the OS specific code. */ VBGLREQHDR_INIT(&Req.Hdr, IDC_DISCONNECT); Req.u.In.pvSession = pHandle->s.pvSession; rc = vbglR0IdcNativeClose(pHandle, &Req); if (RT_SUCCESS(rc)) rc = Req.Hdr.rc; if (RT_SUCCESS(rc)) { pHandle->s.pvSession = NULL; /*ASMAtomicCmpXchgPtr(&g_pMainHandle, NULL, pHandle);*/ } return rc; } /** * Makes an IDC call, returning the request status. * * @returns VBox status code. Request status if the I/O control succeeds, * otherwise the I/O control failure status. * @param pHandle The IDC handle. * @param uReq The request number. * @param pReqHdr The request header. * @param cbReq The request size. */ DECLR0VBGL(int) VbglR0IdcCall(PVBGLIDCHANDLE pHandle, uintptr_t uReq, PVBGLREQHDR pReqHdr, uint32_t cbReq) { int rc = VbglR0IdcCallRaw(pHandle, uReq, pReqHdr, cbReq); if (RT_SUCCESS(rc)) rc = pReqHdr->rc; return rc; }