From 033a1a279311fd2eda02e4c90657542f688b5f8b Mon Sep 17 00:00:00 2001
From: Timur Pocheptsov <timur.pocheptsov@qt.io>
Date: Fri, 23 Mar 2018 12:30:31 +0100
Subject: Add a secure UDP client example

A simple application that establishes DTLS connection(s) and
sends/receives datagrams. Class DtlsAssociation is
essentially a QUdpSocket|QDtls pair: it initiates a handshake,
handles timeouts and errors. After establishing an encrypted
connection it sends messages to the server and processes responses.

Task-number: QTBUG-67596
Change-Id: I92d481b7dfd2459e6a93c754b338a2e897a7feaf
Reviewed-by: Timur Pocheptsov <timur.pocheptsov@qt.io>
---
 examples/network/secureudpclient/association.h | 98 ++++++++++++++++++++++++++
 1 file changed, 98 insertions(+)
 create mode 100644 examples/network/secureudpclient/association.h

(limited to 'examples/network/secureudpclient/association.h')

diff --git a/examples/network/secureudpclient/association.h b/examples/network/secureudpclient/association.h
new file mode 100644
index 0000000000..08fc28e3ed
--- /dev/null
+++ b/examples/network/secureudpclient/association.h
@@ -0,0 +1,98 @@
+/****************************************************************************
+**
+** Copyright (C) 2018 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the examples of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:BSD$
+** 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.
+**
+** BSD License Usage
+** Alternatively, you may use this file under the terms of the BSD license
+** as follows:
+**
+** "Redistribution and use in source and binary forms, with or without
+** modification, are permitted provided that the following conditions are
+** met:
+**   * Redistributions of source code must retain the above copyright
+**     notice, this list of conditions and the following disclaimer.
+**   * Redistributions in binary form must reproduce the above copyright
+**     notice, this list of conditions and the following disclaimer in
+**     the documentation and/or other materials provided with the
+**     distribution.
+**   * Neither the name of The Qt Company Ltd nor the names of its
+**     contributors may be used to endorse or promote products derived
+**     from this software without specific prior written permission.
+**
+**
+** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+#ifndef ASSOCIATION_H
+#define ASSOCIATION_H
+
+#include <QtNetwork>
+#include <QtCore>
+
+QT_BEGIN_NAMESPACE
+
+class DtlsAssociation : public QObject
+{
+    Q_OBJECT
+
+public:
+
+    DtlsAssociation(const QHostAddress &address, quint16 port,
+                    const QString &connectionName);
+    ~DtlsAssociation();
+    void startHandshake();
+
+signals:
+
+    void errorMessage(const QString &message);
+    void warningMessage(const QString &message);
+    void infoMessage(const QString &message);
+    void serverResponse(const QString &clientInfo, const QByteArray &datagraam,
+                        const QByteArray &plainText);
+
+private slots:
+
+    void readyRead();
+    void handshakeTimeout();
+    void pskRequired(QSslPreSharedKeyAuthenticator *auth);
+    void pingTimeout();
+
+private:
+
+    QString name;
+    QUdpSocket socket;
+    QDtls crypto;
+
+    QTimer pingTimer;
+    unsigned ping = 0;
+
+    Q_DISABLE_COPY(DtlsAssociation)
+};
+
+QT_END_NAMESPACE
+
+#endif // ASSOCIATION_H
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