/* $Id: SUPSvc.cpp 85121 2020-07-08 19:33:26Z vboxsync $ */ /** @file * VirtualBox Support Service - Common Code. */ /* * Copyright (C) 2008-2020 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 * *********************************************************************************************************************************/ #define LOG_GROUP LOG_GROUP_SUP #include #include #include #include #include #include "SUPSvcInternal.h" /********************************************************************************************************************************* * Structures and Typedefs * *********************************************************************************************************************************/ /** * Service state. */ typedef enum SUPSVCSERVICESTATE { kSupSvcServiceState_Invalid = 0, kSupSvcServiceState_NotCreated, kSupSvcServiceState_Paused, kSupSvcServiceState_Running, kSupSvcServiceState_End } SUPSVCSERVICESTATE; /** * Service descriptor. */ typedef struct SUPSVCSERVICE { /** The service name. */ const char *pszName; /** The service state. */ SUPSVCSERVICESTATE enmState; /** The instance handle returned by pfnCreate. */ void *pvInstance; /** * Create the service (don't start it). * * @returns VBox status code, log entry is written on failure. * @param ppvInstance Where to store the instance handle. */ DECLCALLBACKMEMBER(int, pfnCreate,(void **ppvInstance)); /** * Start the service. * * @returns VBox status code, log entry is written on failure. * @param pvInstance The instance handle. */ DECLCALLBACKMEMBER(void, pfnStart,(void *pvInstance)); /** * Attempt to stop a running service. * * This should fail if there are active clients. A stopped service * can be restarted by calling pfnStart. * * @returns VBox status code, log entry is written on failure. * @param pvInstance The instance handle. */ DECLCALLBACKMEMBER(int, pfnTryStop,(void *pvInstance)); /** * Destroy the service, stopping first it if necessary. * * @param pvInstance The instance handle. * @param fRunning Whether the service is running or not. */ DECLCALLBACKMEMBER(void, pfnStopAndDestroy,(void *pvInstance, bool fRunning)); } SUPSVCSERVICE; /** Pointer to a service descriptor. */ typedef SUPSVCSERVICE *PSUPSVCSERVICE; /** Pointer to a const service descriptor. */ typedef SUPSVCSERVICE const *PCSUPSVCSERVICE; /********************************************************************************************************************************* * Global Variables * *********************************************************************************************************************************/ static SUPSVCSERVICE g_aServices[] = { { "Global", kSupSvcServiceState_NotCreated, NULL, supSvcGlobalCreate, supSvcGlobalStart, supSvcGlobalTryStop, supSvcGlobalStopAndDestroy, } #ifdef RT_OS_WINDOWS , { "Grant", kSupSvcServiceState_NotCreated, NULL, supSvcGrantCreate, supSvcGrantStart, supSvcGrantTryStop, supSvcGrantStopAndDestroy, } #endif }; /** * Instantiates and starts the services. * * @returns VBox status code. Done bitching on failure. */ int supSvcCreateAndStartServices(void) { LogFlowFuncEnter(); /* * Validate that all services are in the NotCreated state. */ unsigned i; for (i = 0; i < RT_ELEMENTS(g_aServices); i++) if (g_aServices[i].enmState != kSupSvcServiceState_NotCreated) { supSvcLogError("service %s in state %d, expected state %d (NotCreated)", g_aServices[i].pszName, g_aServices[i].enmState, kSupSvcServiceState_NotCreated); return VERR_WRONG_ORDER; } /* * Create all the services, then start them. */ int rc = VINF_SUCCESS; for (i = 0; i < RT_ELEMENTS(g_aServices); i++) { void *pvInstance = NULL; int rc = g_aServices[i].pfnCreate(&pvInstance); if (RT_FAILURE(rc)) { Log(("supSvcCreateAndStartServices: %s -> %Rrc\n", g_aServices[i].pszName, rc)); break; } g_aServices[i].pvInstance = pvInstance; g_aServices[i].enmState = kSupSvcServiceState_Paused; } if (RT_SUCCESS(rc)) { for (i = 0; i < RT_ELEMENTS(g_aServices); i++) { g_aServices[i].pfnStart(g_aServices[i].pvInstance); g_aServices[i].enmState = kSupSvcServiceState_Running; } } else { /* * Destroy any services we managed to instantiate. */ while (i-- > 0) { g_aServices[i].pfnStopAndDestroy(g_aServices[i].pvInstance, false /* fRunning */); g_aServices[i].pvInstance = NULL; g_aServices[i].enmState = kSupSvcServiceState_NotCreated; } } LogFlow(("supSvcCreateAndStartServices: returns %Rrc\n", rc)); return rc; } /** * Checks if it's possible to stop the services. * * @returns VBox status code, done bitching on failure. */ int supSvcTryStopServices(void) { LogFlowFuncEnter(); /* * Check that the services are all created and count the running ones. */ unsigned i; unsigned cRunning = 0; for (i = 0; i < RT_ELEMENTS(g_aServices); i++) if (g_aServices[i].enmState == kSupSvcServiceState_Running) cRunning++; else if (g_aServices[i].enmState == kSupSvcServiceState_NotCreated) { supSvcLogError("service %s in state %d (NotCreated), expected pause or running", g_aServices[i].pszName, g_aServices[i].enmState, kSupSvcServiceState_NotCreated); return VERR_WRONG_ORDER; } if (!cRunning) return VINF_SUCCESS; /* all stopped, nothing to do. */ Assert(cRunning == RT_ELEMENTS(g_aServices)); /* all or nothing */ /* * Try stop them in reverse of start order. */ int rc = VINF_SUCCESS; i = RT_ELEMENTS(g_aServices); while (i-- > 0) { rc = g_aServices[i].pfnTryStop(g_aServices[i].pvInstance); if (RT_FAILURE(rc)) { Log(("supSvcTryStopServices: %s -> %Rrc\n", g_aServices[i].pszName, rc)); break; } g_aServices[i].enmState = kSupSvcServiceState_Paused; } if (RT_FAILURE(rc)) { /* Failed, restart the ones we succeeded in stopping. */ while (++i < RT_ELEMENTS(g_aServices)) { g_aServices[i].pfnStart(g_aServices[i].pvInstance); g_aServices[i].enmState = kSupSvcServiceState_Running; } } LogFlow(("supSvcTryStopServices: returns %Rrc\n", rc)); return rc; } /** * Stops and destroys the services. */ void supSvcStopAndDestroyServices(void) { LogFlowFuncEnter(); /* * Stop and destroy the service in reverse of start order. */ unsigned i = RT_ELEMENTS(g_aServices); while (i-- > 0) if (g_aServices[i].enmState != kSupSvcServiceState_NotCreated) { g_aServices[i].pfnStopAndDestroy(g_aServices[i].pvInstance, g_aServices[i].enmState == kSupSvcServiceState_Running); g_aServices[i].pvInstance = NULL; g_aServices[i].enmState = kSupSvcServiceState_NotCreated; } LogFlowFuncLeave(); } /** * Logs the message to the appropriate system log. * * In debug builds this will also put it in the debug log. * * @param pszMsg The log string. * * @remarks This may later be replaced by the release logger and callback destination(s). */ void supSvcLogErrorStr(const char *pszMsg) { supSvcOsLogErrorStr(pszMsg); LogRel(("%s\n", pszMsg)); } /** * Logs the message to the appropriate system log. * * In debug builds this will also put it in the debug log. * * @param pszFormat The log string. No trailing newline. * @param va Format arguments. * * @todo This should later be replaced by the release logger and callback destination(s). */ void supSvcLogErrorV(const char *pszFormat, va_list va) { if (*pszFormat) { char *pszMsg = NULL; if (RTStrAPrintfV(&pszMsg, pszFormat, va) != -1) { supSvcLogErrorStr(pszMsg); RTStrFree(pszMsg); } else supSvcLogErrorStr(pszFormat); } } /** * Logs the error message to the appropriate system log. * * In debug builds this will also put it in the debug log. * * @param pszFormat The log string. No trailing newline. * @param ... Format arguments. * * @todo This should later be replaced by the release logger and callback destination(s). */ void supSvcLogError(const char *pszFormat, ...) { va_list va; va_start(va, pszFormat); supSvcLogErrorV(pszFormat, va); va_end(va); } /** * Deals with RTGetOpt failure, bitching in the system log. * * @returns 1 * @param pszAction The action name. * @param rc The RTGetOpt return value. * @param argc The argument count. * @param argv The argument vector. * @param iArg The argument index. * @param pValue The value returned by RTGetOpt. */ int supSvcLogGetOptError(const char *pszAction, int rc, int argc, char **argv, int iArg, PCRTOPTIONUNION pValue) { supSvcLogError("%s - RTGetOpt failure, %Rrc (%d): %s", pszAction, rc, rc, iArg < argc ? argv[iArg] : ""); return 1; } /** * Bitch about too many arguments (after RTGetOpt stops) in the system log. * * @returns 1 * @param pszAction The action name. * @param argc The argument count. * @param argv The argument vector. * @param iArg The argument index. */ int supSvcLogTooManyArgsError(const char *pszAction, int argc, char **argv, int iArg) { Assert(iArg < argc); supSvcLogError("%s - Too many arguments: %s", pszAction, argv[iArg]); for ( ; iArg < argc; iArg++) LogRel(("arg#%i: %s\n", iArg, argv[iArg])); return 1; } /** * Prints an error message to the screen. * * @param pszFormat The message format string. * @param va Format arguments. */ void supSvcDisplayErrorV(const char *pszFormat, va_list va) { RTStrmPrintf(g_pStdErr, "VBoxSupSvc error: "); RTStrmPrintfV(g_pStdErr, pszFormat, va); Log(("supSvcDisplayErrorV: %s", pszFormat)); /** @todo format it! */ } /** * Prints an error message to the screen. * * @param pszFormat The message format string. * @param ... Format arguments. */ void supSvcDisplayError(const char *pszFormat, ...) { va_list va; va_start(va, pszFormat); supSvcDisplayErrorV(pszFormat, va); va_end(va); } /** * Deals with RTGetOpt failure. * * @returns 1 * @param pszAction The action name. * @param rc The RTGetOpt return value. * @param argc The argument count. * @param argv The argument vector. * @param iArg The argument index. * @param pValue The value returned by RTGetOpt. */ int supSvcDisplayGetOptError(const char *pszAction, int rc, int argc, char **argv, int iArg, PCRTOPTIONUNION pValue) { supSvcDisplayError("%s - RTGetOpt failure, %Rrc (%d): %s\n", pszAction, rc, rc, iArg < argc ? argv[iArg] : ""); return 1; } /** * Bitch about too many arguments (after RTGetOpt stops). * * @returns 1 * @param pszAction The action name. * @param argc The argument count. * @param argv The argument vector. * @param iArg The argument index. */ int supSvcDisplayTooManyArgsError(const char *pszAction, int argc, char **argv, int iArg) { Assert(iArg < argc); supSvcDisplayError("%s - Too many arguments: %s\n", pszAction, argv[iArg]); return 1; }