| 1 | /* $Id: VBoxCAPIGlue.c 96407 2022-08-22 17:43:14Z vboxsync $ */
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| 2 | /** @file
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| 3 | * Glue code for dynamically linking to VBoxCAPI.
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| 4 | */
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| 5 |
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| 6 | /*
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| 7 | * Copyright (C) 2008-2022 Oracle and/or its affiliates.
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| 8 | *
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| 9 | * Permission is hereby granted, free of charge, to any person
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| 10 | * obtaining a copy of this software and associated documentation
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| 11 | * files (the "Software"), to deal in the Software without
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| 12 | * restriction, including without limitation the rights to use,
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| 13 | * copy, modify, merge, publish, distribute, sublicense, and/or sell
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| 14 | * copies of the Software, and to permit persons to whom the
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| 15 | * Software is furnished to do so, subject to the following
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| 16 | * conditions:
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| 17 | *
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| 18 | * The above copyright notice and this permission notice shall be
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| 19 | * included in all copies or substantial portions of the Software.
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| 20 | *
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| 21 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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| 22 | * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
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| 23 | * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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| 24 | * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
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| 25 | * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
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| 26 | * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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| 27 | * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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| 28 | * OTHER DEALINGS IN THE SOFTWARE.
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| 29 | */
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| 30 |
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| 31 |
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| 32 | /*********************************************************************************************************************************
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| 33 | * Header Files *
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| 34 | *********************************************************************************************************************************/
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| 35 | /* NOTE: do NOT use any include files here which are only available in the
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| 36 | * VirtualBox tree, e.g. iprt. They are not available in the SDK, which is
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| 37 | * where this file will provided as source code and has to be compilable. */
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| 38 | #include "VBoxCAPIGlue.h"
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| 39 |
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| 40 | #include <stdio.h>
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| 41 | #include <string.h>
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| 42 | #include <stdlib.h>
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| 43 | #include <stdarg.h>
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| 44 | #ifdef WIN32
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| 45 | # define _INTPTR 2 /* on Windows stdint.h compares this in #if, causing warnings if not defined */
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| 46 | #endif /* WIN32 */
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| 47 | #include <stdint.h>
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| 48 | #ifndef WIN32
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| 49 | # include <dlfcn.h>
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| 50 | # include <pthread.h>
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| 51 | #else /* WIN32 */
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| 52 | # include <Windows.h>
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| 53 | #endif /* WIN32 */
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| 54 |
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| 55 |
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| 56 | /*********************************************************************************************************************************
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| 57 | * Defined Constants And Macros *
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| 58 | *********************************************************************************************************************************/
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| 59 | #if defined(__linux__) || defined(__linux_gnu__) || defined(__sun__) || defined(__FreeBSD__)
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| 60 | # define DYNLIB_NAME "VBoxXPCOMC.so"
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| 61 | #elif defined(__APPLE__)
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| 62 | # define DYNLIB_NAME "VBoxXPCOMC.dylib"
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| 63 | #elif defined(__OS2__)
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| 64 | # define DYNLIB_NAME "VBoxXPCOMC.dll"
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| 65 | #elif defined(WIN32)
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| 66 | # define DYNLIB_NAME "VBoxCAPI.dll"
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| 67 | #else
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| 68 | # error "Port me"
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| 69 | #endif
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| 70 |
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| 71 |
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| 72 | /*********************************************************************************************************************************
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| 73 | * Global Variables *
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| 74 | *********************************************************************************************************************************/
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| 75 | /** The so/dynsym/dll handle for VBoxCAPI. */
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| 76 | #ifndef WIN32
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| 77 | void *g_hVBoxCAPI = NULL;
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| 78 | #else /* WIN32 */
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| 79 | HMODULE g_hVBoxCAPI = NULL;
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| 80 | #endif /* WIN32 */
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| 81 | /** The last load error. */
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| 82 | char g_szVBoxErrMsg[256] = "";
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| 83 | /** Pointer to the VBOXCAPI function table. */
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| 84 | PCVBOXCAPI g_pVBoxFuncs = NULL;
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| 85 | /** Pointer to VBoxGetCAPIFunctions for the loaded VBoxCAPI so/dylib/dll. */
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| 86 | PFNVBOXGETCAPIFUNCTIONS g_pfnGetFunctions = NULL;
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| 87 |
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| 88 | typedef void FNDUMMY(void);
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| 89 | typedef FNDUMMY *PFNDUMMY;
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| 90 | /** Just a dummy global structure containing a bunch of
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| 91 | * function pointers to code which is wanted in the link. */
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| 92 | PFNDUMMY g_apfnVBoxCAPIGlue[] =
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| 93 | {
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| 94 | #ifndef WIN32
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| 95 | /* The following link dependency is for helping gdb as it gets hideously
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| 96 | * confused if the application doesn't drag in pthreads, but uses it. */
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| 97 | (PFNDUMMY)pthread_create,
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| 98 | #endif /* !WIN32 */
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| 99 | NULL
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| 100 | };
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| 101 |
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| 102 |
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| 103 | /**
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| 104 | * Wrapper for setting g_szVBoxErrMsg. Can be an empty stub.
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| 105 | *
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| 106 | * @param fAlways When 0 the g_szVBoxErrMsg is only set if empty.
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| 107 | * @param pszFormat The format string.
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| 108 | * @param ... The arguments.
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| 109 | */
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| 110 | static void setErrMsg(int fAlways, const char *pszFormat, ...)
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| 111 | {
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| 112 | if ( fAlways
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| 113 | || !g_szVBoxErrMsg[0])
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| 114 | {
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| 115 | va_list va;
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| 116 | va_start(va, pszFormat);
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| 117 | vsnprintf(g_szVBoxErrMsg, sizeof(g_szVBoxErrMsg), pszFormat, va);
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| 118 | va_end(va);
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| 119 | }
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| 120 | }
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| 121 |
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| 122 |
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| 123 | /**
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| 124 | * Try load C API .so/dylib/dll from the specified location and resolve all
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| 125 | * the symbols we need. Tries both the new style and legacy name.
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| 126 | *
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| 127 | * @returns 0 on success, -1 on failure.
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| 128 | * @param pszHome The directory where to try load VBoxCAPI/VBoxXPCOMC
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| 129 | * from. Can be NULL.
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| 130 | * @param fSetAppHome Whether to set the VBOX_APP_HOME env.var. or not
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| 131 | * (boolean).
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| 132 | */
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| 133 | static int tryLoadLibrary(const char *pszHome, int fSetAppHome)
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| 134 | {
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| 135 | size_t cchHome = pszHome ? strlen(pszHome) : 0;
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| 136 | size_t cbBufNeeded;
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| 137 | char szName[4096];
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| 138 |
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| 139 | /*
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| 140 | * Construct the full name.
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| 141 | */
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| 142 | cbBufNeeded = cchHome + sizeof("/" DYNLIB_NAME);
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| 143 | if (cbBufNeeded > sizeof(szName))
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| 144 | {
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| 145 | setErrMsg(1, "path buffer too small: %u bytes needed",
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| 146 | (unsigned)cbBufNeeded);
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| 147 | return -1;
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| 148 | }
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| 149 | if (cchHome)
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| 150 | {
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| 151 | memcpy(szName, pszHome, cchHome);
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| 152 | szName[cchHome] = '/';
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| 153 | cchHome++;
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| 154 | }
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| 155 | memcpy(&szName[cchHome], DYNLIB_NAME, sizeof(DYNLIB_NAME));
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| 156 |
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| 157 | /*
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| 158 | * Try load it by that name, setting the VBOX_APP_HOME first (for now).
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| 159 | * Then resolve and call the function table getter.
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| 160 | */
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| 161 | if (fSetAppHome)
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| 162 | {
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| 163 | #ifndef WIN32
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| 164 | if (pszHome)
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| 165 | setenv("VBOX_APP_HOME", pszHome, 1 /* always override */);
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| 166 | else
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| 167 | unsetenv("VBOX_APP_HOME");
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| 168 | #endif /* !WIN32 */
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| 169 | }
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| 170 |
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| 171 | #ifndef WIN32
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| 172 | g_hVBoxCAPI = dlopen(szName, RTLD_NOW | RTLD_LOCAL);
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| 173 | #else /* WIN32 */
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| 174 | g_hVBoxCAPI = LoadLibraryExA(szName, NULL /* hFile */, 0 /* dwFlags */);
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| 175 | #endif /* WIN32 */
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| 176 | if (g_hVBoxCAPI)
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| 177 | {
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| 178 | PFNVBOXGETCAPIFUNCTIONS pfnGetFunctions;
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| 179 | #ifndef WIN32
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| 180 | pfnGetFunctions = (PFNVBOXGETCAPIFUNCTIONS)(uintptr_t)
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| 181 | dlsym(g_hVBoxCAPI, VBOX_GET_CAPI_FUNCTIONS_SYMBOL_NAME);
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| 182 | # ifdef VBOX_GET_XPCOM_FUNCTIONS_SYMBOL_NAME
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| 183 | if (!pfnGetFunctions)
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| 184 | pfnGetFunctions = (PFNVBOXGETCAPIFUNCTIONS)(uintptr_t)
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| 185 | dlsym(g_hVBoxCAPI, VBOX_GET_XPCOM_FUNCTIONS_SYMBOL_NAME);
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| 186 | # endif /* VBOX_GET_XPCOM_FUNCTIONS_SYMBOL_NAME */
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| 187 | #else /* WIN32 */
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| 188 | pfnGetFunctions = (PFNVBOXGETCAPIFUNCTIONS)
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| 189 | GetProcAddress(g_hVBoxCAPI, VBOX_GET_CAPI_FUNCTIONS_SYMBOL_NAME);
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| 190 | #endif /* WIN32 */
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| 191 | if (pfnGetFunctions)
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| 192 | {
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| 193 | g_pVBoxFuncs = pfnGetFunctions(VBOX_CAPI_VERSION);
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| 194 | if (g_pVBoxFuncs)
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| 195 | {
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| 196 | if ( ( VBOX_CAPI_MAJOR(g_pVBoxFuncs->uVersion)
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| 197 | == VBOX_CAPI_MAJOR(VBOX_CAPI_VERSION))
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| 198 | && ( VBOX_CAPI_MINOR(g_pVBoxFuncs->uVersion)
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| 199 | >= VBOX_CAPI_MINOR(VBOX_CAPI_VERSION)))
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| 200 | {
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| 201 | g_pfnGetFunctions = pfnGetFunctions;
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| 202 | return 0;
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| 203 | }
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| 204 | setErrMsg(1, "%.80s: pfnGetFunctions(%#x) returned incompatible version %#x",
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| 205 | szName, VBOX_CAPI_VERSION, g_pVBoxFuncs->uVersion);
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| 206 | g_pVBoxFuncs = NULL;
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| 207 | }
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| 208 | else
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| 209 | {
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| 210 | /* bail out */
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| 211 | setErrMsg(1, "%.80s: pfnGetFunctions(%#x) failed",
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| 212 | szName, VBOX_CAPI_VERSION);
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| 213 | }
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| 214 | }
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| 215 | else
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| 216 | {
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| 217 | #ifndef WIN32
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| 218 | setErrMsg(1, "dlsym(%.80s/%.32s): %.128s",
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| 219 | szName, VBOX_GET_CAPI_FUNCTIONS_SYMBOL_NAME, dlerror());
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| 220 | #else /* WIN32 */
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| 221 | setErrMsg(1, "GetProcAddress(%.80s/%.32s): %d",
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| 222 | szName, VBOX_GET_CAPI_FUNCTIONS_SYMBOL_NAME, GetLastError());
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| 223 | #endif /* WIN32 */
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| 224 | }
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| 225 |
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| 226 | #ifndef WIN32
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| 227 | dlclose(g_hVBoxCAPI);
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| 228 | #else /* WIN32 */
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| 229 | FreeLibrary(g_hVBoxCAPI);
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| 230 | #endif /* WIN32 */
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| 231 | g_hVBoxCAPI = NULL;
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| 232 | }
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| 233 | else
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| 234 | {
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| 235 | #ifndef WIN32
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| 236 | setErrMsg(0, "dlopen(%.80s): %.160s", szName, dlerror());
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| 237 | #else /* WIN32 */
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| 238 | setErrMsg(0, "LoadLibraryEx(%.80s): %d", szName, GetLastError());
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| 239 | #endif /* WIN32 */
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| 240 | }
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| 241 |
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| 242 | return -1;
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| 243 | }
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| 244 |
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| 245 |
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| 246 | /**
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| 247 | * Tries to locate and load VBoxCAPI.so/dylib/dll, resolving all the related
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| 248 | * function pointers.
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| 249 | *
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| 250 | * @returns 0 on success, -1 on failure.
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| 251 | *
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| 252 | * @remark This should be considered moved into a separate glue library since
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| 253 | * its its going to be pretty much the same for any user of VBoxCAPI
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| 254 | * and it will just cause trouble to have duplicate versions of this
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| 255 | * source code all around the place.
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| 256 | */
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| 257 | int VBoxCGlueInit(void)
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| 258 | {
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| 259 | const char *pszHome;
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| 260 |
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| 261 | memset(g_szVBoxErrMsg, 0, sizeof(g_szVBoxErrMsg));
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| 262 |
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| 263 | /*
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| 264 | * If the user specifies the location, try only that.
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| 265 | */
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| 266 | pszHome = getenv("VBOX_APP_HOME");
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| 267 | if (pszHome)
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| 268 | return tryLoadLibrary(pszHome, 0);
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| 269 |
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| 270 | /*
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| 271 | * Try the known standard locations.
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| 272 | */
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| 273 | #if defined(__gnu__linux__) || defined(__linux__)
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| 274 | if (tryLoadLibrary("/opt/VirtualBox", 1) == 0)
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| 275 | return 0;
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| 276 | if (tryLoadLibrary("/usr/lib/virtualbox", 1) == 0)
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| 277 | return 0;
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| 278 | #elif defined(__sun__)
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| 279 | if (tryLoadLibrary("/opt/VirtualBox/amd64", 1) == 0)
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| 280 | return 0;
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| 281 | if (tryLoadLibrary("/opt/VirtualBox/i386", 1) == 0)
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| 282 | return 0;
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| 283 | #elif defined(__APPLE__)
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| 284 | if (tryLoadLibrary("/Applications/VirtualBox.app/Contents/MacOS", 1) == 0)
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| 285 | return 0;
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| 286 | #elif defined(__FreeBSD__)
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| 287 | if (tryLoadLibrary("/usr/local/lib/virtualbox", 1) == 0)
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| 288 | return 0;
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| 289 | #elif defined(__OS2__)
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| 290 | if (tryLoadLibrary("C:/Apps/VirtualBox", 1) == 0)
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| 291 | return 0;
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| 292 | #elif defined(WIN32)
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| 293 | pszHome = getenv("ProgramFiles");
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| 294 | if (pszHome)
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| 295 | {
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| 296 | char szPath[4096];
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| 297 | size_t cb = sizeof(szPath);
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| 298 | char *tmp = szPath;
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| 299 | strncpy(tmp, pszHome, cb);
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| 300 | tmp[cb - 1] = '\0';
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| 301 | cb -= strlen(tmp);
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| 302 | tmp += strlen(tmp);
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| 303 | strncpy(tmp, "/Oracle/VirtualBox", cb);
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| 304 | tmp[cb - 1] = '\0';
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| 305 | if (tryLoadLibrary(szPath, 1) == 0)
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| 306 | return 0;
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| 307 | }
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| 308 | if (tryLoadLibrary("C:/Program Files/Oracle/VirtualBox", 1) == 0)
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| 309 | return 0;
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| 310 | #else
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| 311 | # error "port me"
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| 312 | #endif
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| 313 |
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| 314 | /*
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| 315 | * Finally try the dynamic linker search path.
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| 316 | */
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| 317 | if (tryLoadLibrary(NULL, 1) == 0)
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| 318 | return 0;
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| 319 |
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| 320 | /* No luck, return failure. */
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| 321 | return -1;
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| 322 | }
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| 323 |
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| 324 |
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| 325 | /**
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| 326 | * Terminate the C glue library.
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| 327 | */
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| 328 | void VBoxCGlueTerm(void)
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| 329 | {
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| 330 | if (g_hVBoxCAPI)
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| 331 | {
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| 332 | #if 0 /* VBoxRT.so doesn't like being reloaded. See @bugref{3725}. */
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| 333 | #ifndef WIN32
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| 334 | dlclose(g_hVBoxCAPI);
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| 335 | #else
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| 336 | FreeLibrary(g_hVBoxCAPI);
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| 337 | #endif
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| 338 | #endif
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| 339 | g_hVBoxCAPI = NULL;
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| 340 | }
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| 341 | g_pVBoxFuncs = NULL;
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| 342 | g_pfnGetFunctions = NULL;
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| 343 | memset(g_szVBoxErrMsg, 0, sizeof(g_szVBoxErrMsg));
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| 344 | }
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| 345 |
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