<?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE html> <html lang="en"> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <title>server.cpp Example File | Qt Network 5.12.6</title> <link rel="stylesheet" type="text/css" href="style/offline-simple.css" /> <script type="text/javascript"> document.getElementsByTagName("link").item(0).setAttribute("href", "style/offline.css"); // loading style sheet breaks anchors that were jumped to before // so force jumping to anchor again setTimeout(function() { var anchor = location.hash; // need to jump to different anchor first (e.g. none) location.hash = "#"; setTimeout(function() { location.hash = anchor; }, 0); }, 0); </script> </head> <body> <div class="header" id="qtdocheader"> <div class="main"> <div class="main-rounded"> <div class="navigationbar"> <table><tr> <td >Qt 5.12</td><td ><a href="qtnetwork-index.html">Qt Network</a></td><td ><a href="qtnetwork-secureudpserver-example.html">DTLS server</a></td><td >server.cpp Example File</td></tr></table><table class="buildversion"><tr> <td id="buildversion" width="100%" align="right"><a href="qtnetwork-index.html">Qt 5.12.6 Reference Documentation</a></td> </tr></table> </div> </div> <div class="content"> <div class="line"> <div class="content mainContent"> <div class="sidebar"><div class="sidebar-content" id="sidebar-content"></div></div> <h1 class="title">server.cpp Example File</h1> <span class="subtitle">secureudpserver/server.cpp</span> <!-- $$$secureudpserver/server.cpp-description --> <div class="descr"> <a name="details"></a> <pre class="cpp"> <span class="comment">/**************************************************************************** ** ** 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." ** ** $QT_END_LICENSE$ ** ****************************************************************************/</span> <span class="preprocessor">#include "server.h"</span> <span class="preprocessor">#include <algorithm></span> <span class="keyword">namespace</span> { <span class="type"><a href="../qtcore/qstring.html">QString</a></span> peer_info(<span class="keyword">const</span> <span class="type"><a href="qhostaddress.html">QHostAddress</a></span> <span class="operator">&</span>address<span class="operator">,</span> <span class="type"><a href="../qtcore/qtglobal.html#quint16-typedef">quint16</a></span> port) { <span class="keyword">const</span> <span class="keyword">static</span> <span class="type"><a href="../qtcore/qstring.html">QString</a></span> info <span class="operator">=</span> <span class="type"><a href="../qtcore/qstring.html#QStringLiteral">QStringLiteral</a></span>(<span class="string">"(%1:%2)"</span>); <span class="keyword">return</span> info<span class="operator">.</span>arg(address<span class="operator">.</span>toString())<span class="operator">.</span>arg(port); } <span class="type"><a href="../qtcore/qstring.html">QString</a></span> connection_info(<span class="type"><a href="../qtcore/qsharedpointer.html">QSharedPointer</a></span><span class="operator"><</span><span class="type"><a href="qdtls.html">QDtls</a></span><span class="operator">></span> connection) { <span class="type"><a href="../qtcore/qstring.html">QString</a></span> info(DtlsServer<span class="operator">::</span>tr(<span class="string">"Session cipher: "</span>)); info <span class="operator">+</span><span class="operator">=</span> connection<span class="operator">-</span><span class="operator">></span>sessionCipher()<span class="operator">.</span>name(); info <span class="operator">+</span><span class="operator">=</span> DtlsServer<span class="operator">::</span>tr(<span class="string">"; session protocol: "</span>); <span class="keyword">switch</span> (connection<span class="operator">-</span><span class="operator">></span>sessionProtocol()) { <span class="keyword">case</span> <span class="type"><a href="qssl.html">QSsl</a></span><span class="operator">::</span>DtlsV1_0: info <span class="operator">+</span><span class="operator">=</span> DtlsServer<span class="operator">::</span>tr(<span class="string">"DTLS 1.0."</span>); <span class="keyword">break</span>; <span class="keyword">case</span> <span class="type"><a href="qssl.html">QSsl</a></span><span class="operator">::</span>DtlsV1_2: info <span class="operator">+</span><span class="operator">=</span> DtlsServer<span class="operator">::</span>tr(<span class="string">"DTLS 1.2."</span>); <span class="keyword">break</span>; <span class="keyword">case</span> <span class="type"><a href="qssl.html">QSsl</a></span><span class="operator">::</span>DtlsV1_2OrLater: info <span class="operator">+</span><span class="operator">=</span> DtlsServer<span class="operator">::</span>tr(<span class="string">"DTLS 1.2 or later."</span>); <span class="keyword">break</span>; <span class="keyword">default</span>: info <span class="operator">+</span><span class="operator">=</span> DtlsServer<span class="operator">::</span>tr(<span class="string">"Unknown protocol."</span>); } <span class="keyword">return</span> info; } } <span class="comment">// unnamed namespace</span> DtlsServer<span class="operator">::</span>DtlsServer() { connect(<span class="operator">&</span>serverSocket<span class="operator">,</span> <span class="operator">&</span><span class="type"><a href="qabstractsocket.html">QAbstractSocket</a></span><span class="operator">::</span>readyRead<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> <span class="operator">&</span>DtlsServer<span class="operator">::</span>readyRead); serverConfiguration <span class="operator">=</span> <span class="type"><a href="qsslconfiguration.html">QSslConfiguration</a></span><span class="operator">::</span>defaultDtlsConfiguration(); serverConfiguration<span class="operator">.</span>setPreSharedKeyIdentityHint(<span class="string">"Qt DTLS example server"</span>); serverConfiguration<span class="operator">.</span>setPeerVerifyMode(<span class="type"><a href="qsslsocket.html">QSslSocket</a></span><span class="operator">::</span>VerifyNone); } DtlsServer<span class="operator">::</span><span class="operator">~</span>DtlsServer() { shutdown(); } bool DtlsServer<span class="operator">::</span>listen(<span class="keyword">const</span> <span class="type"><a href="qhostaddress.html">QHostAddress</a></span> <span class="operator">&</span>address<span class="operator">,</span> <span class="type"><a href="../qtcore/qtglobal.html#quint16-typedef">quint16</a></span> port) { <span class="keyword">if</span> (address <span class="operator">!</span><span class="operator">=</span> serverSocket<span class="operator">.</span>localAddress() <span class="operator">|</span><span class="operator">|</span> port <span class="operator">!</span><span class="operator">=</span> serverSocket<span class="operator">.</span>localPort()) { shutdown(); listening <span class="operator">=</span> serverSocket<span class="operator">.</span>bind(address<span class="operator">,</span> port); <span class="keyword">if</span> (<span class="operator">!</span>listening) <span class="keyword">emit</span> errorMessage(serverSocket<span class="operator">.</span>errorString()); } <span class="keyword">else</span> { listening <span class="operator">=</span> <span class="keyword">true</span>; } <span class="keyword">return</span> listening; } bool DtlsServer<span class="operator">::</span>isListening() <span class="keyword">const</span> { <span class="keyword">return</span> listening; } <span class="type">void</span> DtlsServer<span class="operator">::</span>close() { listening <span class="operator">=</span> <span class="keyword">false</span>; } <span class="type">void</span> DtlsServer<span class="operator">::</span>readyRead() { <span class="keyword">const</span> <span class="type"><a href="../qtcore/qtglobal.html#qint64-typedef">qint64</a></span> bytesToRead <span class="operator">=</span> serverSocket<span class="operator">.</span>pendingDatagramSize(); <span class="keyword">if</span> (bytesToRead <span class="operator"><</span><span class="operator">=</span> <span class="number">0</span>) { <span class="keyword">emit</span> warningMessage(tr(<span class="string">"A spurious read notification"</span>)); <span class="keyword">return</span>; } <span class="type"><a href="../qtcore/qbytearray.html">QByteArray</a></span> dgram(bytesToRead<span class="operator">,</span> <span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>Uninitialized); <span class="type"><a href="qhostaddress.html">QHostAddress</a></span> peerAddress; <span class="type"><a href="../qtcore/qtglobal.html#quint16-typedef">quint16</a></span> peerPort <span class="operator">=</span> <span class="number">0</span>; <span class="keyword">const</span> <span class="type"><a href="../qtcore/qtglobal.html#qint64-typedef">qint64</a></span> bytesRead <span class="operator">=</span> serverSocket<span class="operator">.</span>readDatagram(dgram<span class="operator">.</span>data()<span class="operator">,</span> dgram<span class="operator">.</span>size()<span class="operator">,</span> <span class="operator">&</span>peerAddress<span class="operator">,</span> <span class="operator">&</span>peerPort); <span class="keyword">if</span> (bytesRead <span class="operator"><</span><span class="operator">=</span> <span class="number">0</span>) { <span class="keyword">emit</span> warningMessage(tr(<span class="string">"Failed to read a datagram: "</span>) <span class="operator">+</span> serverSocket<span class="operator">.</span>errorString()); <span class="keyword">return</span>; } dgram<span class="operator">.</span>resize(bytesRead); <span class="keyword">if</span> (peerAddress<span class="operator">.</span>isNull() <span class="operator">|</span><span class="operator">|</span> <span class="operator">!</span>peerPort) { <span class="keyword">emit</span> warningMessage(tr(<span class="string">"Failed to extract peer info (address, port)"</span>)); <span class="keyword">return</span>; } <span class="keyword">const</span> <span class="keyword">auto</span> client <span class="operator">=</span> std<span class="operator">::</span>find_if(knownClients<span class="operator">.</span>begin()<span class="operator">,</span> knownClients<span class="operator">.</span>end()<span class="operator">,</span> <span class="operator">[</span><span class="operator">&</span><span class="operator">]</span>(<span class="keyword">const</span> DtlsConnection <span class="operator">&</span>connection){ <span class="keyword">return</span> connection<span class="operator">-</span><span class="operator">></span>peerAddress() <span class="operator">=</span><span class="operator">=</span> peerAddress <span class="operator">&</span><span class="operator">&</span> connection<span class="operator">-</span><span class="operator">></span>peerPort() <span class="operator">=</span><span class="operator">=</span> peerPort; }); <span class="keyword">if</span> (client <span class="operator">=</span><span class="operator">=</span> knownClients<span class="operator">.</span>end()) <span class="keyword">return</span> handleNewConnection(peerAddress<span class="operator">,</span> peerPort<span class="operator">,</span> dgram); <span class="keyword">if</span> ((<span class="operator">*</span>client)<span class="operator">-</span><span class="operator">></span>isConnectionEncrypted()) { decryptDatagram(<span class="operator">*</span>client<span class="operator">,</span> dgram); <span class="keyword">if</span> ((<span class="operator">*</span>client)<span class="operator">-</span><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) knownClients<span class="operator">.</span>erase(client); <span class="keyword">return</span>; } doHandshake(<span class="operator">*</span>client<span class="operator">,</span> dgram); } <span class="type">void</span> DtlsServer<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">"PSK callback, received a client's identity: '%1'"</span>) <span class="operator">.</span>arg(<span class="type"><a href="../qtcore/qstring.html">QString</a></span><span class="operator">::</span>fromLatin1(auth<span class="operator">-</span><span class="operator">></span>identity()))); auth<span class="operator">-</span><span class="operator">></span>setPreSharedKey(<span class="type"><a href="../qtcore/qbytearray.html#QByteArrayLiteral">QByteArrayLiteral</a></span>(<span class="string">"\x1a\x2b\x3c\x4d\x5e\x6f"</span>)); } <span class="type">void</span> DtlsServer<span class="operator">::</span>handleNewConnection(<span class="keyword">const</span> <span class="type"><a href="qhostaddress.html">QHostAddress</a></span> <span class="operator">&</span>peerAddress<span class="operator">,</span> <span class="type"><a href="../qtcore/qtglobal.html#quint16-typedef">quint16</a></span> peerPort<span class="operator">,</span> <span class="keyword">const</span> <span class="type"><a href="../qtcore/qbytearray.html">QByteArray</a></span> <span class="operator">&</span>clientHello) { <span class="keyword">if</span> (<span class="operator">!</span>listening) <span class="keyword">return</span>; <span class="keyword">const</span> <span class="type"><a href="../qtcore/qstring.html">QString</a></span> peerInfo <span class="operator">=</span> peer_info(peerAddress<span class="operator">,</span> peerPort); <span class="keyword">if</span> (cookieSender<span class="operator">.</span>verifyClient(<span class="operator">&</span>serverSocket<span class="operator">,</span> clientHello<span class="operator">,</span> peerAddress<span class="operator">,</span> peerPort)) { <span class="keyword">emit</span> infoMessage(peerInfo <span class="operator">+</span> tr(<span class="string">": verified, starting a handshake"</span>)); DtlsConnection newConnection(<span class="keyword">new</span> <span class="type"><a href="qdtls.html">QDtls</a></span>(<span class="type"><a href="qsslsocket.html">QSslSocket</a></span><span class="operator">::</span>SslServerMode)); newConnection<span class="operator">-</span><span class="operator">></span>setDtlsConfiguration(serverConfiguration); newConnection<span class="operator">-</span><span class="operator">></span>setPeer(peerAddress<span class="operator">,</span> peerPort); newConnection<span class="operator">-</span><span class="operator">></span>connect(newConnection<span class="operator">.</span>data()<span class="operator">,</span> <span class="operator">&</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">&</span>DtlsServer<span class="operator">::</span>pskRequired); knownClients<span class="operator">.</span>push_back(newConnection); doHandshake(newConnection<span class="operator">,</span> clientHello); } <span class="keyword">else</span> <span class="keyword">if</span> (cookieSender<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>NoError) { <span class="keyword">emit</span> errorMessage(tr(<span class="string">"DTLS error: "</span>) <span class="operator">+</span> cookieSender<span class="operator">.</span>dtlsErrorString()); } <span class="keyword">else</span> { <span class="keyword">emit</span> infoMessage(peerInfo <span class="operator">+</span> tr(<span class="string">": not verified yet"</span>)); } } <span class="type">void</span> DtlsServer<span class="operator">::</span>doHandshake(DtlsConnection newConnection<span class="operator">,</span> <span class="keyword">const</span> <span class="type"><a href="../qtcore/qbytearray.html">QByteArray</a></span> <span class="operator">&</span>clientHello) { <span class="keyword">const</span> bool result <span class="operator">=</span> newConnection<span class="operator">-</span><span class="operator">></span>doHandshake(<span class="operator">&</span>serverSocket<span class="operator">,</span> clientHello); <span class="keyword">if</span> (<span class="operator">!</span>result) { <span class="keyword">emit</span> errorMessage(newConnection<span class="operator">-</span><span class="operator">></span>dtlsErrorString()); <span class="keyword">return</span>; } <span class="keyword">const</span> <span class="type"><a href="../qtcore/qstring.html">QString</a></span> peerInfo <span class="operator">=</span> peer_info(newConnection<span class="operator">-</span><span class="operator">></span>peerAddress()<span class="operator">,</span> newConnection<span class="operator">-</span><span class="operator">></span>peerPort()); <span class="keyword">switch</span> (newConnection<span class="operator">-</span><span class="operator">></span>handshakeState()) { <span class="keyword">case</span> <span class="type"><a href="qdtls.html">QDtls</a></span><span class="operator">::</span>HandshakeInProgress: <span class="keyword">emit</span> infoMessage(peerInfo <span class="operator">+</span> tr(<span class="string">": handshake is in progress ..."</span>)); <span class="keyword">break</span>; <span class="keyword">case</span> <span class="type"><a href="qdtls.html">QDtls</a></span><span class="operator">::</span>HandshakeComplete: <span class="keyword">emit</span> infoMessage(tr(<span class="string">"Connection with %1 encrypted. %2"</span>) <span class="operator">.</span>arg(peerInfo<span class="operator">,</span> connection_info(newConnection))); <span class="keyword">break</span>; <span class="keyword">default</span>: Q_UNREACHABLE(); } } <span class="type">void</span> DtlsServer<span class="operator">::</span>decryptDatagram(DtlsConnection connection<span class="operator">,</span> <span class="keyword">const</span> <span class="type"><a href="../qtcore/qbytearray.html">QByteArray</a></span> <span class="operator">&</span>clientMessage) { Q_ASSERT(connection<span class="operator">-</span><span class="operator">></span>isConnectionEncrypted()); <span class="keyword">const</span> <span class="type"><a href="../qtcore/qstring.html">QString</a></span> peerInfo <span class="operator">=</span> peer_info(connection<span class="operator">-</span><span class="operator">></span>peerAddress()<span class="operator">,</span> connection<span class="operator">-</span><span class="operator">></span>peerPort()); <span class="keyword">const</span> <span class="type"><a href="../qtcore/qbytearray.html">QByteArray</a></span> dgram <span class="operator">=</span> connection<span class="operator">-</span><span class="operator">></span>decryptDatagram(<span class="operator">&</span>serverSocket<span class="operator">,</span> clientMessage); <span class="keyword">if</span> (dgram<span class="operator">.</span>size()) { <span class="keyword">emit</span> datagramReceived(peerInfo<span class="operator">,</span> clientMessage<span class="operator">,</span> dgram); connection<span class="operator">-</span><span class="operator">></span>writeDatagramEncrypted(<span class="operator">&</span>serverSocket<span class="operator">,</span> tr(<span class="string">"to %1: ACK"</span>)<span class="operator">.</span>arg(peerInfo)<span class="operator">.</span>toLatin1()); } <span class="keyword">else</span> <span class="keyword">if</span> (connection<span class="operator">-</span><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>NoError) { <span class="keyword">emit</span> warningMessage(peerInfo <span class="operator">+</span> <span class="string">": "</span> <span class="operator">+</span> tr(<span class="string">"0 byte dgram, could be a re-connect attempt?"</span>)); } <span class="keyword">else</span> { <span class="keyword">emit</span> errorMessage(peerInfo <span class="operator">+</span> <span class="string">": "</span> <span class="operator">+</span> connection<span class="operator">-</span><span class="operator">></span>dtlsErrorString()); } } <span class="type">void</span> DtlsServer<span class="operator">::</span>shutdown() { <span class="keyword">for</span> (DtlsConnection <span class="operator">&</span>connection : knownClients) connection<span class="operator">-</span><span class="operator">></span>shutdown(<span class="operator">&</span>serverSocket); knownClients<span class="operator">.</span>clear(); serverSocket<span class="operator">.</span>close(); } </pre> </div> <!-- @@@secureudpserver/server.cpp --> </div> </div> </div> </div> </div> <div class="footer"> <p> <acronym title="Copyright">©</acronym> 2019 The Qt Company Ltd. Documentation contributions included herein are the copyrights of their respective owners.<br/> The documentation provided herein is licensed under the terms of the <a href="http://www.gnu.org/licenses/fdl.html">GNU Free Documentation License version 1.3</a> as published by the Free Software Foundation.<br/> Qt and respective logos are trademarks of The Qt Company Ltd. in Finland and/or other countries worldwide. All other trademarks are property of their respective owners. </p> </div> </body> </html>