ssdp.h

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// Program Name: ssdp.h
// Created     : Oct. 1, 2005
//
// Purpose     : SSDP Discovery Service Implmenetation
//
// Copyright (c) 2005 David Blain <dblain@mythtv.org>
//
// Licensed under the GPL v2 or later, see LICENSE for details
//
 
#ifndef SSDP_H
#define SSDP_H
 
#include <array>
 
#include <QFile>
 
#include "libmythbase/mthread.h"
 
#include "upnpexp.h"
#include "httpserver.h"
#include "taskqueue.h"
#include "msocketdevice.h"
#include "ssdpcache.h"
#include "upnptasknotify.h"
 
static constexpr const char* SSDP_GROUP { "239.255.255.250" };
static constexpr uint16_t SSDP_PORT       { 1900 };
static constexpr uint16_t SSDP_SEARCHPORT { 6549 };
 
enum SSDPMethod
{
    SSDPM_Unknown         = 0,
    SSDPM_GetDeviceDesc   = 1,
    SSDPM_GetDeviceList   = 2
};
 
enum SSDPRequestType
{
    SSDP_Unknown        = 0,
    SSDP_MSearch        = 1,
    SSDP_MSearchResp    = 2,
    SSDP_Notify         = 3
};
 
//
// SSDPThread Class Definition  (Singleton)
//
 
enum SocketIdxType
{
    SocketIdx_Search     = 0,
    SocketIdx_Multicast  = 1,
    SocketIdx_Broadcast  = 2
};
 
class UPNP_PUBLIC SSDP : public MThread
{
    private:
        // Singleton instance used by all.
        static SSDP*        g_pSSDP;  
 
        QRegularExpression  m_procReqLineExp        {"\\s+"};
        constexpr static int kNumberOfSockets = 3;
        std::array<MSocketDevice*,kNumberOfSockets> m_sockets {nullptr,nullptr,nullptr};
 
        int                 m_nPort                 {SSDP_PORT};
        int                 m_nSearchPort           {SSDP_SEARCHPORT};
        int                 m_nServicePort          {0};
 
        UPnpNotifyTask     *m_pNotifyTask           {nullptr};
        bool                m_bAnnouncementsEnabled {false};
 
        bool                m_bTermRequested        {false};
        QMutex              m_lock;
 
    private:
 
        // ------------------------------------------------------------------
        // Private so the singleton pattern can be enforced.
        // ------------------------------------------------------------------
 
        SSDP   ();
        
    protected:
 
        bool    ProcessSearchRequest ( const QStringMap &sHeaders,
                                       const QHostAddress&  peerAddress,
                                       quint16       peerPort ) const;
        static bool    ProcessSearchResponse( const QStringMap &sHeaders );
        static bool    ProcessNotify        ( const QStringMap &sHeaders );
 
        bool    IsTermRequested      ();
 
        static QString GetHeaderValue    ( const QStringMap &headers,
                                    const QString    &sKey,
                                    const QString    &sDefault );
 
        void    ProcessData       ( MSocketDevice *pSocket );
 
        SSDPRequestType ProcessRequestLine( const QString &sLine );
 
        void    run() override; // MThread
 
    public:
 
        static SSDP* Instance();
        static void Shutdown();
 
            ~SSDP() override;
 
        void RequestTerminate(void);
 
        void PerformSearch(const QString &sST, std::chrono::seconds timeout = 2s);
 
        void EnableNotifications ( int nServicePort );
        void DisableNotifications();
 
        // ------------------------------------------------------------------
 
        static void AddListener(QObject *listener)
            { SSDPCache::Instance()->addListener(listener); }
        static void RemoveListener(QObject *listener)
            { SSDPCache::Instance()->removeListener(listener); }
 
        static SSDPCacheEntries *Find(const QString &sURI)
            { return SSDPCache::Instance()->Find(sURI); }
        static DeviceLocation   *Find(const QString &sURI, 
                                      const QString &sUSN)
            { return SSDPCache::Instance()->Find( sURI, sUSN ); }
};
 
//
// SSDPExtension Class Definition
//
 
class SSDPExtension : public HttpServerExtension
{
    private:
 
        QString     m_sUPnpDescPath;
        int         m_nServicePort;
 
    private:
 
        static SSDPMethod GetMethod( const QString &sURI );
 
        void       GetDeviceDesc( HTTPRequest *pRequest ) const;
        void       GetFile      ( HTTPRequest *pRequest, const QString& sFileName );
        static void       GetDeviceList( HTTPRequest *pRequest );
 
    public:
                 SSDPExtension( int nServicePort, const QString &sSharePath);
        ~SSDPExtension( ) override = default;
 
        QStringList GetBasePaths() override; // HttpServerExtension
        
        bool     ProcessRequest( HTTPRequest *pRequest ) override; // HttpServerExtension
};
 
#endif // SSDP_H