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<h1 class="title">association.cpp Example File</h1>
<span class="subtitle">secureudpclient/association.cpp</span>
<!-- $$$secureudpclient/association.cpp-description -->
<div class="descr"> <a name="details"></a>
<pre class="cpp">

  <span class="comment">/****************************************************************************
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  ** Copyright (C) 2018 The Qt Company Ltd.
  ** Contact: https://www.qt.io/licensing/
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  ** This file is part of the examples of the Qt Toolkit.
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  <span class="preprocessor">#include &quot;association.h&quot;</span>

  DtlsAssociation<span class="operator">::</span>DtlsAssociation(<span class="keyword">const</span> <span class="type"><a href="qhostaddress.html">QHostAddress</a></span> <span class="operator">&amp;</span>address<span class="operator">,</span> <span class="type"><a href="../qtcore/qtglobal.html#quint16-typedef">quint16</a></span> port<span class="operator">,</span>
                                   <span class="keyword">const</span> <span class="type"><a href="../qtcore/qstring.html">QString</a></span> <span class="operator">&amp;</span>connectionName)
      : name(connectionName)<span class="operator">,</span>
        crypto(<span class="type"><a href="qsslsocket.html">QSslSocket</a></span><span class="operator">::</span>SslClientMode)
  {
      <span class="keyword">auto</span> configuration <span class="operator">=</span> <span class="type"><a href="qsslconfiguration.html">QSslConfiguration</a></span><span class="operator">::</span>defaultDtlsConfiguration();
      configuration<span class="operator">.</span>setPeerVerifyMode(<span class="type"><a href="qsslsocket.html">QSslSocket</a></span><span class="operator">::</span>VerifyNone);
      crypto<span class="operator">.</span>setPeer(address<span class="operator">,</span> port);
      crypto<span class="operator">.</span>setDtlsConfiguration(configuration);

      connect(<span class="operator">&amp;</span>crypto<span class="operator">,</span> <span class="operator">&amp;</span><span class="type"><a href="qdtls.html">QDtls</a></span><span class="operator">::</span>handshakeTimeout<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> <span class="operator">&amp;</span>DtlsAssociation<span class="operator">::</span>handshakeTimeout);
      connect(<span class="operator">&amp;</span>crypto<span class="operator">,</span> <span class="operator">&amp;</span><span class="type"><a href="qdtls.html">QDtls</a></span><span class="operator">::</span>pskRequired<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> <span class="operator">&amp;</span>DtlsAssociation<span class="operator">::</span>pskRequired);
      socket<span class="operator">.</span>connectToHost(address<span class="operator">.</span>toString()<span class="operator">,</span> port);
      connect(<span class="operator">&amp;</span>socket<span class="operator">,</span> <span class="operator">&amp;</span><span class="type"><a href="qudpsocket.html">QUdpSocket</a></span><span class="operator">::</span>readyRead<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> <span class="operator">&amp;</span>DtlsAssociation<span class="operator">::</span>readyRead);
      pingTimer<span class="operator">.</span>setInterval(<span class="number">5000</span>);
      connect(<span class="operator">&amp;</span>pingTimer<span class="operator">,</span> <span class="operator">&amp;</span><span class="type"><a href="../qtcore/qtimer.html">QTimer</a></span><span class="operator">::</span>timeout<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> <span class="operator">&amp;</span>DtlsAssociation<span class="operator">::</span>pingTimeout);
  }

  DtlsAssociation<span class="operator">::</span><span class="operator">~</span>DtlsAssociation()
  {
      <span class="keyword">if</span> (crypto<span class="operator">.</span>isConnectionEncrypted())
          crypto<span class="operator">.</span>shutdown(<span class="operator">&amp;</span>socket);
  }

  <span class="type">void</span> DtlsAssociation<span class="operator">::</span>startHandshake()
  {
      <span class="keyword">if</span> (socket<span class="operator">.</span>state() <span class="operator">!</span><span class="operator">=</span> <span class="type"><a href="qabstractsocket.html">QAbstractSocket</a></span><span class="operator">::</span>ConnectedState) {
          <span class="keyword">emit</span> infoMessage(tr(<span class="string">&quot;%1: connecting UDP socket first ...&quot;</span>)<span class="operator">.</span>arg(name));
          connect(<span class="operator">&amp;</span>socket<span class="operator">,</span> <span class="operator">&amp;</span><span class="type"><a href="qabstractsocket.html">QAbstractSocket</a></span><span class="operator">::</span>connected<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> <span class="operator">&amp;</span>DtlsAssociation<span class="operator">::</span>udpSocketConnected);
          <span class="keyword">return</span>;
      }

      <span class="keyword">if</span> (<span class="operator">!</span>crypto<span class="operator">.</span>doHandshake(<span class="operator">&amp;</span>socket))
          <span class="keyword">emit</span> errorMessage(tr(<span class="string">&quot;%1: failed to start a handshake - %2&quot;</span>)<span class="operator">.</span>arg(name<span class="operator">,</span> crypto<span class="operator">.</span>dtlsErrorString()));
      <span class="keyword">else</span>
          <span class="keyword">emit</span> infoMessage(tr(<span class="string">&quot;%1: starting a handshake&quot;</span>)<span class="operator">.</span>arg(name));
  }

  <span class="type">void</span> DtlsAssociation<span class="operator">::</span>udpSocketConnected()
  {
      <span class="keyword">emit</span> infoMessage(tr(<span class="string">&quot;%1: UDP socket is now in ConnectedState, continue with handshake ...&quot;</span>)<span class="operator">.</span>arg(name));
      startHandshake();
  }

  <span class="type">void</span> DtlsAssociation<span class="operator">::</span>readyRead()
  {
      <span class="type"><a href="../qtcore/qbytearray.html">QByteArray</a></span> dgram(socket<span class="operator">.</span>pendingDatagramSize()<span class="operator">,</span> <span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>Uninitialized);
      <span class="keyword">const</span> <span class="type"><a href="../qtcore/qtglobal.html#qint64-typedef">qint64</a></span> bytesRead <span class="operator">=</span> socket<span class="operator">.</span>readDatagram(dgram<span class="operator">.</span>data()<span class="operator">,</span> dgram<span class="operator">.</span>size());
      <span class="keyword">if</span> (bytesRead <span class="operator">&lt;</span><span class="operator">=</span> <span class="number">0</span>) {
          <span class="keyword">emit</span> warningMessage(tr(<span class="string">&quot;%1: spurious read notification?&quot;</span>)<span class="operator">.</span>arg(name));
          <span class="keyword">return</span>;
      }

      dgram<span class="operator">.</span>resize(bytesRead);
      <span class="keyword">if</span> (crypto<span class="operator">.</span>isConnectionEncrypted()) {
          <span class="keyword">const</span> <span class="type"><a href="../qtcore/qbytearray.html">QByteArray</a></span> plainText <span class="operator">=</span> crypto<span class="operator">.</span>decryptDatagram(<span class="operator">&amp;</span>socket<span class="operator">,</span> dgram);
          <span class="keyword">if</span> (plainText<span class="operator">.</span>size()) {
              <span class="keyword">emit</span> serverResponse(name<span class="operator">,</span> dgram<span class="operator">,</span> plainText);
              <span class="keyword">return</span>;
          }

          <span class="keyword">if</span> (crypto<span class="operator">.</span>dtlsError() <span class="operator">=</span><span class="operator">=</span> <span class="type"><a href="qdtls.html#QDtlsError-enum">QDtlsError</a></span><span class="operator">::</span>RemoteClosedConnectionError) {
              <span class="keyword">emit</span> errorMessage(tr(<span class="string">&quot;%1: shutdown alert received&quot;</span>)<span class="operator">.</span>arg(name));
              socket<span class="operator">.</span>close();
              pingTimer<span class="operator">.</span>stop();
              <span class="keyword">return</span>;
          }

          <span class="keyword">emit</span> warningMessage(tr(<span class="string">&quot;%1: zero-length datagram received?&quot;</span>)<span class="operator">.</span>arg(name));
      } <span class="keyword">else</span> {
          <span class="keyword">if</span> (<span class="operator">!</span>crypto<span class="operator">.</span>doHandshake(<span class="operator">&amp;</span>socket<span class="operator">,</span> dgram)) {
              <span class="keyword">emit</span> errorMessage(tr(<span class="string">&quot;%1: handshake error - %2&quot;</span>)<span class="operator">.</span>arg(name<span class="operator">,</span> crypto<span class="operator">.</span>dtlsErrorString()));
              <span class="keyword">return</span>;
          }

          <span class="keyword">if</span> (crypto<span class="operator">.</span>isConnectionEncrypted()) {
              <span class="keyword">emit</span> infoMessage(tr(<span class="string">&quot;%1: encrypted connection established!&quot;</span>)<span class="operator">.</span>arg(name));
              pingTimer<span class="operator">.</span>start();
              pingTimeout();
          } <span class="keyword">else</span> {
              <span class="keyword">emit</span> infoMessage(tr(<span class="string">&quot;%1: continuing with handshake ...&quot;</span>)<span class="operator">.</span>arg(name));
          }
      }
  }

  <span class="type">void</span> DtlsAssociation<span class="operator">::</span>handshakeTimeout()
  {
      <span class="keyword">emit</span> warningMessage(tr(<span class="string">&quot;%1: handshake timeout, trying to re-transmit&quot;</span>)<span class="operator">.</span>arg(name));
      <span class="keyword">if</span> (<span class="operator">!</span>crypto<span class="operator">.</span>handleTimeout(<span class="operator">&amp;</span>socket))
          <span class="keyword">emit</span> errorMessage(tr(<span class="string">&quot;%1: failed to re-transmit - %2&quot;</span>)<span class="operator">.</span>arg(name<span class="operator">,</span> crypto<span class="operator">.</span>dtlsErrorString()));
  }

  <span class="type">void</span> DtlsAssociation<span class="operator">::</span>pskRequired(<span class="type"><a href="qsslpresharedkeyauthenticator.html">QSslPreSharedKeyAuthenticator</a></span> <span class="operator">*</span>auth)
  {
      Q_ASSERT(auth);

      <span class="keyword">emit</span> infoMessage(tr(<span class="string">&quot;%1: providing pre-shared key ...&quot;</span>)<span class="operator">.</span>arg(name));
      auth<span class="operator">-</span><span class="operator">&gt;</span>setIdentity(name<span class="operator">.</span>toLatin1());
      auth<span class="operator">-</span><span class="operator">&gt;</span>setPreSharedKey(<span class="type"><a href="../qtcore/qbytearray.html#QByteArrayLiteral">QByteArrayLiteral</a></span>(<span class="string">&quot;\x1a\x2b\x3c\x4d\x5e\x6f&quot;</span>));
  }

  <span class="type">void</span> DtlsAssociation<span class="operator">::</span>pingTimeout()
  {
      <span class="keyword">static</span> <span class="keyword">const</span> <span class="type"><a href="../qtcore/qstring.html">QString</a></span> message <span class="operator">=</span> <span class="type"><a href="../qtcore/qstring.html#QStringLiteral">QStringLiteral</a></span>(<span class="string">&quot;I am %1, please, accept our ping %2&quot;</span>);
      <span class="keyword">const</span> <span class="type"><a href="../qtcore/qtglobal.html#qint64-typedef">qint64</a></span> written <span class="operator">=</span> crypto<span class="operator">.</span>writeDatagramEncrypted(<span class="operator">&amp;</span>socket<span class="operator">,</span> message<span class="operator">.</span>arg(name)<span class="operator">.</span>arg(ping)<span class="operator">.</span>toLatin1());
      <span class="keyword">if</span> (written <span class="operator">&lt;</span><span class="operator">=</span> <span class="number">0</span>) {
          <span class="keyword">emit</span> errorMessage(tr(<span class="string">&quot;%1: failed to send a ping - %2&quot;</span>)<span class="operator">.</span>arg(name<span class="operator">,</span> crypto<span class="operator">.</span>dtlsErrorString()));
          pingTimer<span class="operator">.</span>stop();
          <span class="keyword">return</span>;
      }

      <span class="operator">+</span><span class="operator">+</span>ping;
  }

</pre>
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<!-- @@@secureudpclient/association.cpp -->
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