1 files changed, 105 insertions, 0 deletions
diff --git a/src/VBox/Main/src-server/linux/vbox-libhal.cpp b/src/VBox/Main/src-server/linux/vbox-libhal.cpp
new file mode 100644
index 00000000..f48182c2
--- /dev/null
+++ b/src/VBox/Main/src-server/linux/vbox-libhal.cpp
@@ -0,0 +1,105 @@
+/* $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;
+    }
+}