QNetworkInterface: add a Linux backend directly using AF_NETLINK

This allows us a lot greater detail in getting information than relying
on getifaddrs() function. It is also the only way of getting some extra
information we'll need in the future, like address lifetimes.

The parser will also be helpful if we want to add a network interface
monitor in the future, though I currently have no clue how to do the
equivalent on macOS and Windows.

This commit does not remove the support for getifaddrs() on Linux, but I
will no longer add features to it. Note that Android does not support
getifaddrs(), so this may be an improvement if AF_NETLINK works there.

Change-Id: I3868166e5efc45538544fffd14d8e6f993e1eb91
Reviewed-by: Timur Pocheptsov <timur.pocheptsov@qt.io>
Reviewed-by: Edward Welbourne <edward.welbourne@qt.io>

1 files changed, 102 insertions, 0 deletions

diff --git a/src/network/kernel/qnetworkinterface_unix_p.h b/src/network/kernel/qnetworkinterface_unix_p.h
new file mode 100644
index 0000000000..c085194e3c
--- /dev/null
+++ b/src/network/kernel/qnetworkinterface_unix_p.h
@@ -0,0 +1,102 @@
+/****************************************************************************
+**
+** Copyright (C) 2017 The Qt Company Ltd.
+** Copyright (C) 2017 Intel Corporation.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the QtNetwork module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see https://www.qt.io/terms-conditions. For further
+** information use the contact form at https://www.qt.io/contact-us.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 3 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL3 included in the
+** packaging of this file. Please review the following information to
+** ensure the GNU Lesser General Public License version 3 requirements
+** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 2.0 or (at your option) the GNU General
+** Public license version 3 or any later version approved by the KDE Free
+** Qt Foundation. The licenses are as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
+** included in the packaging of this file. Please review the following
+** information to ensure the GNU General Public License requirements will
+** be met: https://www.gnu.org/licenses/gpl-2.0.html and
+** https://www.gnu.org/licenses/gpl-3.0.html.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef QNETWORKINTERFACE_UNIX_P_H
+#define QNETWORKINTERFACE_UNIX_P_H
+
+//
+//  W A R N I N G
+//  -------------
+//
+// This file is not part of the Qt API. It exists purely as an
+// implementation detail. This header file may change from version to
+// version without notice, or even be removed.
+//
+// We mean it.
+//
+
+#include "qnetworkinterface_p.h"
+#include "private/qnet_unix_p.h"
+
+#ifndef QT_NO_NETWORKINTERFACE
+
+#define IP_MULTICAST    // make AIX happy and define IFF_MULTICAST
+
+#include <sys/types.h>
+#include <sys/socket.h>
+#ifdef Q_OS_SOLARIS
+#  include <sys/sockio.h>
+#endif
+#ifdef Q_OS_HAIKU
+#  include <sys/sockio.h>
+#  define IFF_RUNNING 0x0001
+#endif
+#if QT_CONFIG(linux_netlink)
+// Same as net/if.h but contains other things we need in
+// qnetworkinterface_linux.cpp.
+#  include <linux/if.h>
+#else
+#  include <net/if.h>
+#endif
+
+QT_BEGIN_NAMESPACE
+
+static QNetworkInterface::InterfaceFlags convertFlags(uint rawFlags)
+{
+    QNetworkInterface::InterfaceFlags flags = 0;
+    flags |= (rawFlags & IFF_UP) ? QNetworkInterface::IsUp : QNetworkInterface::InterfaceFlag(0);
+    flags |= (rawFlags & IFF_RUNNING) ? QNetworkInterface::IsRunning : QNetworkInterface::InterfaceFlag(0);
+    flags |= (rawFlags & IFF_BROADCAST) ? QNetworkInterface::CanBroadcast : QNetworkInterface::InterfaceFlag(0);
+    flags |= (rawFlags & IFF_LOOPBACK) ? QNetworkInterface::IsLoopBack : QNetworkInterface::InterfaceFlag(0);
+#ifdef IFF_POINTOPOINT //cygwin doesn't define IFF_POINTOPOINT
+    flags |= (rawFlags & IFF_POINTOPOINT) ? QNetworkInterface::IsPointToPoint : QNetworkInterface::InterfaceFlag(0);
+#endif
+
+#ifdef IFF_MULTICAST
+    flags |= (rawFlags & IFF_MULTICAST) ? QNetworkInterface::CanMulticast : QNetworkInterface::InterfaceFlag(0);
+#endif
+    return flags;
+}
+
+QT_END_NAMESPACE
+
+#endif // QT_NO_NETWORKINTERFACE
+
+#endif // QNETWORKINTERFACE_UNIX_P_H