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/* $Id: vbox-libhal.cpp $ */
/** @file
*
* Module to dynamically load libhal and libdbus and load all symbols
* which are needed by VirtualBox.
*/
/*
* Copyright (C) 2006-2023 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>.
*
* SPDX-License-Identifier: GPL-3.0-only
*/
#include "vbox-libhal.h"
#include <iprt/errcore.h>
#include <iprt/ldr.h>
/**
* Whether we have tried to load libdbus and libhal yet. This flag should only be set
* to "true" after we have either loaded both libraries and all symbols which we need,
* or failed to load something and unloaded and set back to zero pLibDBus and pLibHal.
*/
static bool gCheckedForLibHal = false;
/**
* Pointer to the libhal shared object. This should only be set once all needed libraries
* and symbols have been successfully loaded.
*/
static RTLDRMOD ghLibHal = 0;
/** The following are the symbols which we need from libdbus and libhal. */
void (*gDBusErrorInit)(DBusError *);
DBusConnection *(*gDBusBusGet)(DBusBusType, DBusError *);
void (*gDBusErrorFree)(DBusError *);
void (*gDBusConnectionUnref)(DBusConnection *);
LibHalContext *(*gLibHalCtxNew)(void);
dbus_bool_t (*gLibHalCtxSetDBusConnection)(LibHalContext *, DBusConnection *);
dbus_bool_t (*gLibHalCtxInit)(LibHalContext *, DBusError *);
char **(*gLibHalFindDeviceStringMatch)(LibHalContext *, const char *, const char *, int *,
DBusError *);
char *(*gLibHalDeviceGetPropertyString)(LibHalContext *, const char *, const char *, DBusError *);
void (*gLibHalFreeString)(char *);
void (*gLibHalFreeStringArray)(char **);
dbus_bool_t (*gLibHalCtxShutdown)(LibHalContext *, DBusError *);
dbus_bool_t (*gLibHalCtxFree)(LibHalContext *);
bool gLibHalCheckPresence(void)
{
RTLDRMOD hLibHal;
if (ghLibHal != 0 && gCheckedForLibHal == true)
return true;
if (gCheckedForLibHal == true)
return false;
if (!RT_SUCCESS(RTLdrLoad(LIB_HAL, &hLibHal)))
{
return false;
}
if ( RT_SUCCESS(RTLdrGetSymbol(hLibHal, "dbus_error_init", (void **) &gDBusErrorInit))
&& RT_SUCCESS(RTLdrGetSymbol(hLibHal, "dbus_bus_get", (void **) &gDBusBusGet))
&& RT_SUCCESS(RTLdrGetSymbol(hLibHal, "dbus_error_free", (void **) &gDBusErrorFree))
&& RT_SUCCESS(RTLdrGetSymbol(hLibHal, "dbus_connection_unref",
(void **) &gDBusConnectionUnref))
&& RT_SUCCESS(RTLdrGetSymbol(hLibHal, "libhal_ctx_new", (void **) &gLibHalCtxNew))
&& RT_SUCCESS(RTLdrGetSymbol(hLibHal, "libhal_ctx_set_dbus_connection",
(void **) &gLibHalCtxSetDBusConnection))
&& RT_SUCCESS(RTLdrGetSymbol(hLibHal, "libhal_ctx_init", (void **) &gLibHalCtxInit))
&& RT_SUCCESS(RTLdrGetSymbol(hLibHal, "libhal_manager_find_device_string_match",
(void **) &gLibHalFindDeviceStringMatch))
&& RT_SUCCESS(RTLdrGetSymbol(hLibHal, "libhal_device_get_property_string",
(void **) &gLibHalDeviceGetPropertyString))
&& RT_SUCCESS(RTLdrGetSymbol(hLibHal, "libhal_free_string", (void **) &gLibHalFreeString))
&& RT_SUCCESS(RTLdrGetSymbol(hLibHal, "libhal_free_string_array",
(void **) &gLibHalFreeStringArray))
&& RT_SUCCESS(RTLdrGetSymbol(hLibHal, "libhal_ctx_shutdown", (void **) &gLibHalCtxShutdown))
&& RT_SUCCESS(RTLdrGetSymbol(hLibHal, "libhal_ctx_free", (void **) &gLibHalCtxFree))
)
{
ghLibHal = hLibHal;
gCheckedForLibHal = true;
return true;
}
else
{
RTLdrClose(hLibHal);
gCheckedForLibHal = true;
return false;
}
}
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