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129 lines
3.8 KiB
129 lines
3.8 KiB
// Copyright © 2015 Jean-Luc Deltombe (LX3JL). All rights reserved.
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// urfd -- The universal reflector
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// Copyright © 2021 Thomas A. Early N7TAE
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// Copyright © 2021 Doug McLain AD8DP
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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 <https://www.gnu.org/licenses/>.
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#pragma once
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#include "Defines.h"
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#include "Timer.h"
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#include "Protocol.h"
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#include "DVHeaderPacket.h"
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#include "DVFramePacket.h"
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////////////////////////////////////////////////////////////////////////////////////////
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// define
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// NXDN Module ID
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#define NXDN_MODULE_ID 'B'
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////////////////////////////////////////////////////////////////////////////////////////
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// class
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class CNXDNStreamCacheItem
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{
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public:
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CNXDNStreamCacheItem() : m_iSeqCounter(0) {}
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CDvHeaderPacket m_dvHeader;
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CDvFramePacket m_dvFrames[4];
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uint32_t m_iSeqCounter;
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};
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class CNXDNProtocol : public CProtocol
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{
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public:
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// constructor
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CNXDNProtocol();
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// initialization
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bool Initialize(const char *type, const EProtocol ptype, const uint16_t port, const bool has_ipv4, const bool has_ipv6);
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void Close(void);
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// task
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void Task(void);
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protected:
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// queue helper
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void HandleQueue(void);
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// keepalive helpers
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void HandleKeepalives(void);
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// stream helpers
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void OnDvHeaderPacketIn(std::unique_ptr<CDvHeaderPacket> &, const CIp &);
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// DV packet decoding helpers
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bool IsValidConnectPacket(const CBuffer &, CCallsign *);
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bool IsValidDisconnectPacket(const CBuffer &);
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bool IsValidDvHeaderPacket(const CIp &, const CBuffer &, std::unique_ptr<CDvHeaderPacket> &);
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bool IsValidDvFramePacket(const CIp &, const CBuffer &, std::unique_ptr<CDvHeaderPacket> &, std::array<std::unique_ptr<CDvFramePacket>, 4> &);
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bool IsValidDvLastFramePacket(const CIp &, const CBuffer &);
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// DV packet encoding helpers
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bool EncodeNXDNHeaderPacket(const CDvHeaderPacket &, CBuffer &, bool islast = false);
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bool EncodeNXDNPacket(const CDvHeaderPacket &, uint32_t, const CDvFramePacket *, CBuffer &);
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bool EncodeLastNXDNPacket(const CDvHeaderPacket &, CBuffer &) const;
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// uiStreamId helpers
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uint32_t IpToStreamId(const CIp &) const;
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void encode(const unsigned char*, unsigned char*) const;
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void decode(const unsigned char*, unsigned char*) const;
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uint8_t get_lich_fct(uint8_t);
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void set_lich_rfct(uint8_t);
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void set_lich_fct(uint8_t);
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void set_lich_option(uint8_t);
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void set_lich_dir(uint8_t);
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void set_sacch_ran(uint8_t);
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void set_sacch_struct(uint8_t);
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void set_sacch_data(const uint8_t *);
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void set_layer3_msgtype(uint8_t);
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void set_layer3_srcid(uint16_t);
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void set_layer3_dstid(uint16_t);
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void set_layer3_grp(bool);
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void set_layer3_blks(uint8_t);
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void layer3_encode(uint8_t*, uint8_t, uint8_t);
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uint8_t get_lich();
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void get_sacch(uint8_t *);
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void encode_crc6(uint8_t *, uint8_t);
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// debug
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bool DebugTestDecodePacket(const CBuffer &);
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bool DebugDumpHeaderPacket(const CBuffer &);
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bool DebugDumpDvPacket(const CBuffer &);
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bool DebugDumpLastDvPacket(const CBuffer &);
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protected:
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// for keep alive
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CTimer m_LastKeepaliveTime;
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// for queue header caches
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std::unordered_map<char, CNXDNStreamCacheItem> m_StreamsCache;
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unsigned char m_seqNo;
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uint32_t m_uiStreamId;
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uint8_t m_lich;
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uint8_t m_sacch[5];
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uint8_t m_layer3[22];
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uint16_t m_ReflectorId;
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char m_AutolinkModule;
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};
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