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1 files changed, 222 insertions, 0 deletions
diff --git a/src/VBox/HostDrivers/Support/SUPR0IdcClient.c b/src/VBox/HostDrivers/Support/SUPR0IdcClient.c
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+++ b/src/VBox/HostDrivers/Support/SUPR0IdcClient.c
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+/* $Id: SUPR0IdcClient.c $ */
+/** @file
+ * VirtualBox Support Driver - IDC Client Lib, Core.
+ */
+
+/*
+ * Copyright (C) 2008-2022 Oracle and/or its affiliates.
+ *
+ * This file is part of VirtualBox base platform packages, as
+ * available from https://www.virtualbox.org.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation, in version 3 of the
+ * License.
+ *
+ * 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 GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, see <https://www.gnu.org/licenses>.
+ *
+ * The contents of this file may alternatively be used under the terms
+ * of the Common Development and Distribution License Version 1.0
+ * (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
+ * in the VirtualBox 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.
+ *
+ * SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
+ */
+
+
+/*********************************************************************************************************************************
+* Header Files *
+*********************************************************************************************************************************/
+#include "SUPR0IdcClientInternal.h"
+#include <iprt/errcore.h>
+#include <iprt/asm.h>
+
+
+/*********************************************************************************************************************************
+* Global Variables *
+*********************************************************************************************************************************/
+static PSUPDRVIDCHANDLE 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.
+ */
+SUPR0DECL(int) SUPR0IdcOpen(PSUPDRVIDCHANDLE pHandle, uint32_t uReqVersion, uint32_t uMinVersion,
+ uint32_t *puSessionVersion, uint32_t *puDriverVersion, uint32_t *puDriverRevision)
+{
+ unsigned uDefaultMinVersion;
+ SUPDRVIDCREQCONNECT Req;
+ int rc;
+
+ /*
+ * Validate and set failure return values.
+ */
+ AssertPtrReturn(pHandle, VERR_INVALID_POINTER);
+ pHandle->s.pSession = 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)) == (SUPDRV_IDC_VERSION & UINT32_C(0xffff0000)), VERR_INVALID_PARAMETER);
+ AssertReturn(!uReqVersion || (uReqVersion & UINT32_C(0xffff0000)) == (SUPDRV_IDC_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 = SUPDRV_IDC_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.
+ */
+ Req.Hdr.cb = sizeof(Req);
+ Req.Hdr.rc = VERR_WRONG_ORDER;
+ Req.Hdr.pSession = NULL;
+ Req.u.In.u32MagicCookie = SUPDRVIDCREQ_CONNECT_MAGIC_COOKIE;
+ Req.u.In.uMinVersion = uMinVersion;
+ Req.u.In.uReqVersion = uReqVersion;
+ rc = supR0IdcNativeOpen(pHandle, &Req);
+ if (RT_SUCCESS(rc))
+ {
+ pHandle->s.pSession = Req.u.Out.pSession;
+ 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.pSession)
+ && Req.u.Out.uSessionVersion >= uMinVersion
+ && (Req.u.Out.uSessionVersion & UINT32_C(0xffff0000)) == (SUPDRV_IDC_VERSION & UINT32_C(0xffff0000)))
+ {
+ ASMAtomicCmpXchgPtr(&g_pMainHandle, pHandle, NULL);
+ return rc;
+ }
+
+ AssertMsgFailed(("pSession=%p uSessionVersion=0x%x (r%u)\n", Req.u.Out.pSession, Req.u.Out.uSessionVersion, Req.u.Out.uDriverRevision));
+ rc = VERR_VERSION_MISMATCH;
+ SUPR0IdcClose(pHandle);
+ }
+
+ return rc;
+}
+
+
+/**
+ * Closes a IDC connection established by SUPR0IdcOpen.
+ *
+ * @returns VBox status code.
+ * @param pHandle The IDC handle.
+ */
+SUPR0DECL(int) SUPR0IdcClose(PSUPDRVIDCHANDLE pHandle)
+{
+ SUPDRVIDCREQHDR Req;
+ int rc;
+
+ /*
+ * Catch closed handles and check that the session is valid.
+ */
+ AssertPtrReturn(pHandle, VERR_INVALID_POINTER);
+ if (!pHandle->s.pSession)
+ return VERR_INVALID_HANDLE;
+ AssertPtrReturn(pHandle->s.pSession, VERR_INVALID_HANDLE);
+
+ /*
+ * Create the request and hand it to the OS specific code.
+ */
+ Req.cb = sizeof(Req);
+ Req.rc = VERR_WRONG_ORDER;
+ Req.pSession = pHandle->s.pSession;
+ rc = supR0IdcNativeClose(pHandle, &Req);
+ if (RT_SUCCESS(rc))
+ {
+ pHandle->s.pSession = NULL;
+ ASMAtomicCmpXchgPtr(&g_pMainHandle, NULL, pHandle);
+ }
+ return rc;
+}
+
+
+/**
+ * Get the SUPDRV session for the IDC connection.
+ *
+ * This is for use with SUPDRV and component APIs that requires a valid
+ * session handle.
+ *
+ * @returns The session handle on success, NULL if the IDC handle is invalid.
+ *
+ * @param pHandle The IDC handle.
+ */
+SUPR0DECL(PSUPDRVSESSION) SUPR0IdcGetSession(PSUPDRVIDCHANDLE pHandle)
+{
+ PSUPDRVSESSION pSession;
+ AssertPtrReturn(pHandle, NULL);
+ pSession = pHandle->s.pSession;
+ AssertPtrReturn(pSession, NULL);
+ return pSession;
+}
+
+
+/**
+ * Looks up a IDC handle by session.
+ *
+ * @returns The IDC handle on success, NULL on failure.
+ * @param pSession The session to lookup.
+ *
+ * @internal
+ */
+PSUPDRVIDCHANDLE supR0IdcGetHandleFromSession(PSUPDRVSESSION pSession)
+{
+ PSUPDRVIDCHANDLE pHandle = ASMAtomicUoReadPtrT(&g_pMainHandle, PSUPDRVIDCHANDLE);
+ if ( RT_VALID_PTR(pHandle)
+ && pHandle->s.pSession == pSession)
+ return pHandle;
+ return NULL;
+}
+
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