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qMDNS.h
1/*
2 SPDX-FileCopyrightText: 2016 Alex Spataru
3 SPDX-License-Identifier: MIT
4*/
5
6#pragma once
7
8#include <QObject>
9
10class QHostInfo;
11class QUdpSocket;
12class QHostAddress;
13
14/**
15 * \brief Implements a simple mDNS responder using Qt
16 *
17 * This implementation is able perform mDNS queries and mDNS responses in any
18 * operating system supported by the Qt network module.
19 *
20 * You can obtain the IP of an mDNS device using the \c lookup() function,
21 * the \c hostFound() signal will be emitted whenever this class interprets
22 * a mDNS response packet and obtains valid information about a remote host.
23 *
24 * You can change the name that the local computer uses to identify itself
25 * in the mDNS network using the \c setHostName() function.
26 *
27 * \todo Implement NSEC block code generation in the \c sendResponse() packet
28 */
29class qMDNS : public QObject {
31
32 signals:
33 void hostFound (const QHostInfo& info);
34
35 public:
36 static qMDNS* getInstance();
37
38 QString hostName() const;
39 QString getAddress (const QString& string);
40
41 protected:
42 explicit qMDNS();
43 ~qMDNS();
44
45 public slots:
46 void setTTL (const quint32 ttl);
47 void lookup (const QString& name);
48 void setHostName (const QString& name);
49
50 private slots:
51 void onReadyRead();
52 void readQuery (const QByteArray& data);
53 void sendPacket (const QByteArray& data);
54 void readResponse (const QByteArray& data);
55 void sendResponse (const quint16 query_id);
56
57 private:
58 QString getHostNameFromResponse (const QByteArray& data);
59 QString getIPv4FromResponse (const QByteArray& data, const QString& host);
60 QStringList getIPv6FromResponse (const QByteArray& data, const QString& host);
61 QList<QHostAddress> getAddressesFromResponse (const QByteArray& data,
62 const QString& host);
63
64 private:
65 quint32 m_ttl;
66 QString m_hostName;
67 QString m_serviceName;
68 QUdpSocket* m_IPv4Socket;
69 QUdpSocket* m_IPv6Socket;
70};
Implements a simple mDNS responder using Qt.
Definition qMDNS.h:29
void lookup(const QString &name)
Performs a mDNS lookup to find the given host name.
Definition qMDNS.cpp:195
void setTTL(const quint32 ttl)
Changes the TTL send to other computers in the mDNS network.
Definition qMDNS.cpp:184
void setHostName(const QString &name)
Changes the host name of the client computer.
Definition qMDNS.cpp:274
static qMDNS * getInstance()
Returns the only running instance of this class.
Definition qMDNS.cpp:151
QString hostName() const
Returns the mDNS name assigned to the client computer.
Definition qMDNS.cpp:160
QString getAddress(const QString &string)
Ensures that the given string is a valid mDNS/DNS address.
Definition qMDNS.cpp:168
Q_OBJECTQ_OBJECT
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