kdeconnect-kde/core/backends/lan/mdns_wrapper.h

/**
 * SPDX-FileCopyrightText: 2023 Albert Vaca Cintora <albertvaka@gmail.com>
 *
 * SPDX-License-Identifier: GPL-2.0-only OR GPL-3.0-only OR LicenseRef-KDE-Accepted-GPL
 */

#ifndef KDECONNECT_MDNS_WRAPPER_H
#define KDECONNECT_MDNS_WRAPPER_H

#include <QHostAddress>
#include <QMap>
#include <QSocketNotifier>
#include <QString>
#include <QVector>

#ifdef _WIN32
#include <winsock2.h>
#else
#include <netinet/in.h>
#endif

/*
 * A Qt wrapper for the mdns.h header-only library
 * from https://github.com/mjansson/mdns
 */
class MdnsWrapper : public QObject
{
    Q_OBJECT

public:
    struct MdnsService {
        QString name;
        uint16_t port;
        QHostAddress address;
        QMap<QString, QString> txtRecords;
    };

    // serviceType should be of the form _kdeconnect._udp.local
    void startDiscovering(const QString &serviceType);
    void stopDiscovering();

    void sendQuery(const QString &serviceName);

Q_SIGNALS:
    void serviceFound(const MdnsService &service);

private:
    int listenForQueryResponses();
    void stopListeningForQueryResponses();

    QVector<QSocketNotifier *> responseSocketNotifiers;
};

class MdnsServiceAnnouncer : public QObject
{
    Q_OBJECT

public:
    struct AnnouncedInfo {
        QByteArray serviceType; // ie: "<_service-type>._tcp.local."
        QByteArray serviceInstance; // ie: "<service-name>.<_service-type>._tcp.local."
        QByteArray hostname; // ie: "<hostname>.local."
        uint16_t port;
        QHash<QByteArray, QByteArray> txtRecords;
        sockaddr_in address_ipv4;
        sockaddr_in6 address_ipv6;
    };

    // serviceType should be of the form _kdeconnect._udp.local
    MdnsServiceAnnouncer(const QString &serviceName, const QString &serviceType, uint16_t port);

    void putTxtRecord(const QString &key, const QString &value)
    {
        self.txtRecords[key.toLatin1()] = value.toLatin1();
    }

    void startAnnouncing();
    void stopAnnouncing();

    void sendMulticastAnnounce(bool isGoodbye);

private:
    int listenForQueries();
    void stopListeningForQueries();

    AnnouncedInfo self;

    QSocketNotifier *socketNotifier = nullptr;
    QSocketNotifier *socketNotifierV6 = nullptr;
};

#endif