| 1 | /* $Id: VBoxGuestR3LibHGCM.cpp 96407 2022-08-22 17:43:14Z vboxsync $ */
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| 2 | /** @file
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| 3 | * VBoxGuestR3Lib - Ring-3 Support Library for VirtualBox guest additions,
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| 4 | * generic HGCM.
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| 5 | */
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| 6 |
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| 7 | /*
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| 8 | * Copyright (C) 2015-2022 Oracle and/or its affiliates.
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| 9 | *
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| 10 | * This file is part of VirtualBox base platform packages, as
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| 11 | * available from https://www.virtualbox.org.
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| 12 | *
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| 13 | * This program is free software; you can redistribute it and/or
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| 14 | * modify it under the terms of the GNU General Public License
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| 15 | * as published by the Free Software Foundation, in version 3 of the
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| 16 | * License.
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| 17 | *
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| 18 | * This program is distributed in the hope that it will be useful, but
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| 19 | * WITHOUT ANY WARRANTY; without even the implied warranty of
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| 20 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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| 21 | * General Public License for more details.
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| 22 | *
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| 23 | * You should have received a copy of the GNU General Public License
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| 24 | * along with this program; if not, see <https://www.gnu.org/licenses>.
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| 25 | *
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| 26 | * The contents of this file may alternatively be used under the terms
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| 27 | * of the Common Development and Distribution License Version 1.0
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| 28 | * (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
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| 29 | * in the VirtualBox distribution, in which case the provisions of the
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| 30 | * CDDL are applicable instead of those of the GPL.
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| 31 | *
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| 32 | * You may elect to license modified versions of this file under the
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| 33 | * terms and conditions of either the GPL or the CDDL or both.
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| 34 | *
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| 35 | * SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
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| 36 | */
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| 37 |
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| 38 |
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| 39 | /*********************************************************************************************************************************
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| 40 | * Header Files *
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| 41 | *********************************************************************************************************************************/
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| 42 | #include "VBoxGuestR3LibInternal.h"
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| 43 | #include <VBox/VBoxGuestLib.h>
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| 44 | #include <iprt/string.h>
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| 45 |
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| 46 |
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| 47 | /**
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| 48 | * Connects to an HGCM service.
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| 49 | *
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| 50 | * @returns VBox status code
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| 51 | * @param pszServiceName Name of the host service.
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| 52 | * @param pidClient Where to put the client ID on success. The client ID
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| 53 | * must be passed to all the other calls to the service.
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| 54 | */
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| 55 | VBGLR3DECL(int) VbglR3HGCMConnect(const char *pszServiceName, HGCMCLIENTID *pidClient)
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| 56 | {
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| 57 | AssertPtrReturn(pszServiceName, VERR_INVALID_POINTER);
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| 58 | AssertPtrReturn(pidClient, VERR_INVALID_POINTER);
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| 59 |
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| 60 | VBGLIOCHGCMCONNECT Info;
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| 61 | RT_ZERO(Info);
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| 62 | VBGLREQHDR_INIT(&Info.Hdr, HGCM_CONNECT);
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| 63 | Info.u.In.Loc.type = VMMDevHGCMLoc_LocalHost_Existing;
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| 64 | int rc = RTStrCopy(Info.u.In.Loc.u.host.achName, sizeof(Info.u.In.Loc.u.host.achName), pszServiceName);
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| 65 | if (RT_FAILURE(rc))
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| 66 | return rc;
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| 67 | rc = vbglR3DoIOCtl(VBGL_IOCTL_HGCM_CONNECT, &Info.Hdr, sizeof(Info));
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| 68 | if (RT_SUCCESS(rc))
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| 69 | *pidClient = Info.u.Out.idClient;
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| 70 | return rc;
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| 71 | }
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| 72 |
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| 73 |
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| 74 | /**
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| 75 | * Disconnect from an HGCM service.
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| 76 | *
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| 77 | * @returns VBox status code.
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| 78 | * @param idClient The client id returned by VbglR3HGCMConnect().
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| 79 | */
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| 80 | VBGLR3DECL(int) VbglR3HGCMDisconnect(HGCMCLIENTID idClient)
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| 81 | {
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| 82 | VBGLIOCHGCMDISCONNECT Info;
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| 83 | VBGLREQHDR_INIT(&Info.Hdr, HGCM_DISCONNECT);
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| 84 | Info.u.In.idClient = idClient;
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| 85 |
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| 86 | return vbglR3DoIOCtl(VBGL_IOCTL_HGCM_DISCONNECT, &Info.Hdr, sizeof(Info));
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| 87 | }
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| 88 |
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| 89 |
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| 90 | /**
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| 91 | * Makes a fully prepared HGCM call.
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| 92 | *
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| 93 | * @returns VBox status code.
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| 94 | * @param pInfo Fully prepared HGCM call info.
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| 95 | * @param cbInfo Size of the info. This may sometimes be larger than
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| 96 | * what the parameter count indicates because of
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| 97 | * parameter changes between versions and such.
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| 98 | */
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| 99 | VBGLR3DECL(int) VbglR3HGCMCall(PVBGLIOCHGCMCALL pInfo, size_t cbInfo)
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| 100 | {
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| 101 | /* Expect caller to have filled in pInfo. */
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| 102 | AssertMsg(pInfo->Hdr.cbIn == cbInfo, ("cbIn=%#x cbInfo=%#zx\n", pInfo->Hdr.cbIn, cbInfo));
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| 103 | AssertMsg(pInfo->Hdr.cbOut == cbInfo, ("cbOut=%#x cbInfo=%#zx\n", pInfo->Hdr.cbOut, cbInfo));
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| 104 | Assert(sizeof(*pInfo) + pInfo->cParms * sizeof(HGCMFunctionParameter) <= cbInfo);
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| 105 | Assert(pInfo->u32ClientID != 0);
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| 106 |
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| 107 | return vbglR3DoIOCtl(VBGL_IOCTL_HGCM_CALL(cbInfo), &pInfo->Hdr, cbInfo);
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| 108 | }
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