| 1 | /* $Id: vbox-libhal.cpp 96407 2022-08-22 17:43:14Z vboxsync $ */
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| 2 | /** @file
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| 3 | *
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| 4 | * Module to dynamically load libhal and libdbus and load all symbols
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| 5 | * which are needed by VirtualBox.
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| 6 | */
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| 7 |
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| 8 | /*
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| 9 | * Copyright (C) 2006-2022 Oracle and/or its affiliates.
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| 10 | *
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| 11 | * This file is part of VirtualBox base platform packages, as
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| 12 | * available from https://www.virtualbox.org.
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| 13 | *
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| 14 | * This program is free software; you can redistribute it and/or
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| 15 | * modify it under the terms of the GNU General Public License
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| 16 | * as published by the Free Software Foundation, in version 3 of the
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| 17 | * License.
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| 18 | *
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| 19 | * This program is distributed in the hope that it will be useful, but
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| 20 | * WITHOUT ANY WARRANTY; without even the implied warranty of
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| 21 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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| 22 | * General Public License for more details.
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| 23 | *
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| 24 | * You should have received a copy of the GNU General Public License
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| 25 | * along with this program; if not, see <https://www.gnu.org/licenses>.
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| 26 | *
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| 27 | * SPDX-License-Identifier: GPL-3.0-only
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| 28 | */
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| 29 |
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| 30 | #include "vbox-libhal.h"
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| 31 |
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| 32 | #include <iprt/errcore.h>
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| 33 | #include <iprt/ldr.h>
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| 34 |
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| 35 | /**
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| 36 | * Whether we have tried to load libdbus and libhal yet. This flag should only be set
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| 37 | * to "true" after we have either loaded both libraries and all symbols which we need,
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| 38 | * or failed to load something and unloaded and set back to zero pLibDBus and pLibHal.
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| 39 | */
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| 40 | static bool gCheckedForLibHal = false;
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| 41 | /**
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| 42 | * Pointer to the libhal shared object. This should only be set once all needed libraries
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| 43 | * and symbols have been successfully loaded.
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| 44 | */
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| 45 | static RTLDRMOD ghLibHal = 0;
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| 46 |
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| 47 | /** The following are the symbols which we need from libdbus and libhal. */
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| 48 | void (*gDBusErrorInit)(DBusError *);
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| 49 | DBusConnection *(*gDBusBusGet)(DBusBusType, DBusError *);
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| 50 | void (*gDBusErrorFree)(DBusError *);
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| 51 | void (*gDBusConnectionUnref)(DBusConnection *);
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| 52 | LibHalContext *(*gLibHalCtxNew)(void);
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| 53 | dbus_bool_t (*gLibHalCtxSetDBusConnection)(LibHalContext *, DBusConnection *);
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| 54 | dbus_bool_t (*gLibHalCtxInit)(LibHalContext *, DBusError *);
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| 55 | char **(*gLibHalFindDeviceStringMatch)(LibHalContext *, const char *, const char *, int *,
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| 56 | DBusError *);
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| 57 | char *(*gLibHalDeviceGetPropertyString)(LibHalContext *, const char *, const char *, DBusError *);
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| 58 | void (*gLibHalFreeString)(char *);
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| 59 | void (*gLibHalFreeStringArray)(char **);
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| 60 | dbus_bool_t (*gLibHalCtxShutdown)(LibHalContext *, DBusError *);
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| 61 | dbus_bool_t (*gLibHalCtxFree)(LibHalContext *);
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| 62 |
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| 63 | bool gLibHalCheckPresence(void)
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| 64 | {
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| 65 | RTLDRMOD hLibHal;
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| 66 |
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| 67 | if (ghLibHal != 0 && gCheckedForLibHal == true)
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| 68 | return true;
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| 69 | if (gCheckedForLibHal == true)
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| 70 | return false;
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| 71 | if (!RT_SUCCESS(RTLdrLoad(LIB_HAL, &hLibHal)))
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| 72 | {
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| 73 | return false;
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| 74 | }
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| 75 | if ( RT_SUCCESS(RTLdrGetSymbol(hLibHal, "dbus_error_init", (void **) &gDBusErrorInit))
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| 76 | && RT_SUCCESS(RTLdrGetSymbol(hLibHal, "dbus_bus_get", (void **) &gDBusBusGet))
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| 77 | && RT_SUCCESS(RTLdrGetSymbol(hLibHal, "dbus_error_free", (void **) &gDBusErrorFree))
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| 78 | && RT_SUCCESS(RTLdrGetSymbol(hLibHal, "dbus_connection_unref",
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| 79 | (void **) &gDBusConnectionUnref))
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| 80 | && RT_SUCCESS(RTLdrGetSymbol(hLibHal, "libhal_ctx_new", (void **) &gLibHalCtxNew))
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| 81 | && RT_SUCCESS(RTLdrGetSymbol(hLibHal, "libhal_ctx_set_dbus_connection",
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| 82 | (void **) &gLibHalCtxSetDBusConnection))
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| 83 | && RT_SUCCESS(RTLdrGetSymbol(hLibHal, "libhal_ctx_init", (void **) &gLibHalCtxInit))
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| 84 | && RT_SUCCESS(RTLdrGetSymbol(hLibHal, "libhal_manager_find_device_string_match",
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| 85 | (void **) &gLibHalFindDeviceStringMatch))
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| 86 | && RT_SUCCESS(RTLdrGetSymbol(hLibHal, "libhal_device_get_property_string",
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| 87 | (void **) &gLibHalDeviceGetPropertyString))
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| 88 | && RT_SUCCESS(RTLdrGetSymbol(hLibHal, "libhal_free_string", (void **) &gLibHalFreeString))
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| 89 | && RT_SUCCESS(RTLdrGetSymbol(hLibHal, "libhal_free_string_array",
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| 90 | (void **) &gLibHalFreeStringArray))
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| 91 | && RT_SUCCESS(RTLdrGetSymbol(hLibHal, "libhal_ctx_shutdown", (void **) &gLibHalCtxShutdown))
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| 92 | && RT_SUCCESS(RTLdrGetSymbol(hLibHal, "libhal_ctx_free", (void **) &gLibHalCtxFree))
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| 93 | )
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| 94 | {
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| 95 | ghLibHal = hLibHal;
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| 96 | gCheckedForLibHal = true;
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| 97 | return true;
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| 98 | }
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| 99 | else
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| 100 | {
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| 101 | RTLdrClose(hLibHal);
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| 102 | gCheckedForLibHal = true;
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| 103 | return false;
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| 104 | }
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| 105 | }
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