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90 lines
3.2 KiB
90 lines
3.2 KiB
3 weeks ago
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//
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// mdnspublisher.h
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//
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// Circle - A C++ bare metal environment for Raspberry Pi
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// Copyright (C) 2024 R. Stange <rsta2@o2online.de>
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program. If not, see <http://www.gnu.org/licenses/>.
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//
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#ifndef _circle_net_mdnspublisher_h
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#define _circle_net_mdnspublisher_h
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#include <circle/sched/task.h>
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#include <circle/sched/mutex.h>
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#include <circle/sched/synchronizationevent.h>
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#include <circle/net/netsubsystem.h>
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#include <circle/net/socket.h>
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#include <circle/net/ipaddress.h>
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#include <circle/ptrlist.h>
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#include <circle/string.h>
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#include <circle/types.h>
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class CmDNSPublisher : public CTask /// mDNS / Bonjour client task
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{
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public:
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static constexpr const char *ServiceTypeAppleMIDI = "_apple-midi._udp";
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public:
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/// \param pNet Pointer to the network subsystem object
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CmDNSPublisher (CNetSubSystem *pNet);
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~CmDNSPublisher (void);
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/// \brief Start publishing a service
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/// \param pServiceName Name of the service to be published
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/// \param pServiceType Type of the service to be published (e.g. ServiceTypeAppleMIDI)
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/// \param usServicePort Port number of the service to be published (in host byte order)
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/// \param ppText Descriptions of the service (terminated with a nullptr, or nullptr itself)
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/// \return Operation successful?
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boolean PublishService (const char *pServiceName,
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const char *pServiceType,
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u16 usServicePort,
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const char *ppText[] = nullptr);
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/// \brief Stop publishing a service
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/// \param pServiceName Name of the service to be unpublished (same as when published)
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/// \return Operation successful?
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boolean UnpublishService (const char *pServiceName);
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void Run (void) override;
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private:
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static const unsigned MaxTextRecords = 10;
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static const unsigned MaxMessageSize = 1400; // safe UDP payload in an Ethernet frame
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static const unsigned TTLShort = 15; // seconds
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static const unsigned TTLLong = 4500;
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static const unsigned TTLDelete = 0;
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struct TService
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{
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CString ServiceName;
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CString ServiceType;
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u16 usServicePort;
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unsigned nTextRecords;
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CString *ppText[MaxTextRecords];
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};
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boolean SendResponse (TService *pService, boolean bDelete);
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// Helpers for writing to buffer
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void PutByte (u8 uchValue);
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void PutWord (u16 usValue);
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void PutDWord (u32 nValue);
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void PutString (const char *pValue);
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void PutCompressedString (const u8 *pWritePtr);
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void PutDNSName (const char *pValue);
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void PutIPAddress (const CIPAddress &rValue);
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void ReserveDataLength (void);
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void SetDataLength (void);
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private:
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CNetSubSystem *m_pNet;
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CPtrList m_ServiceList;
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CMutex m_Mutex;
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CSocket *m_pSocket;
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boolean m_bRunning;
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CSynchronizationEvent m_Event;
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u8 m_Buffer[MaxMessageSize];
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u8 *m_pWritePtr;
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u8 *m_pDataLen;
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};
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#endif
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