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148 lines
3.3 KiB
148 lines
3.3 KiB
/*
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* Copyright (C) 2018-2019 by Thomas A. Early N7TAE
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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 2 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, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#pragma once
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#include <atomic>
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#include <cstring>
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#include <string>
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#include <queue>
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#include <netinet/in.h>
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#include "Random.h" // for streamid generation
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#include "UnixDgramSocket.h"
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#define CALL_SIZE 8
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#define IP_SIZE 15
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enum REPLY_TYPE {
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RT_TIMEOUT,
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RT_ERROR,
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RT_UNKNOWN,
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RT_HEADER,
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RT_DATA,
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RT_HEADER_ACK,
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RT_DATA_ACK,
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RT_PONG
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};
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// Icom Terminal and Access Point Mode data structure
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#pragma pack(push, 1)
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typedef struct itap_tag {
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unsigned char length;
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// 41 for header
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// 16 for voice
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unsigned char type;
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// 0x03U pong
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// 0x10U header from icom
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// 0x11U acknowledgment
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// 0x12U data from icom (it's EOT if voice.sequence bit 0x40 is set)
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// 0x13U acknowledgment
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// 0x20U header to icom
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// 0x21U header acknowledgment
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// 0x22U data to icom
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// 0x23U data acknowledgment
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union {
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struct {
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unsigned char flag[3];
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unsigned char r2[8];
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unsigned char r1[8];
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unsigned char ur[8];
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unsigned char my[8];
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unsigned char nm[4];
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} header;
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struct {
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unsigned char counter; // ordinal counter is reset with each header
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unsigned char sequence; // is modulo 21
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unsigned char ambe[9];
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unsigned char text[3];
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} voice;
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};
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} SITAP;
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#pragma pack(pop)
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class CFrame
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{
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public:
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CFrame(const unsigned char *buf) {
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memcpy(&frame.length, buf, buf[0]);
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}
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CFrame(const CFrame &from) {
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memcpy(&frame.length, from.data(), from.size());
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}
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~CFrame() {}
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size_t size() const { return (size_t)frame.length; }
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const unsigned char *data() const { return &frame.length; }
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private:
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SITAP frame;
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};
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class CQnetITAP
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{
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public:
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// functions
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CQnetITAP(int mod);
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~CQnetITAP();
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void Run(const char *cfgfile);
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// data
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static std::atomic<bool> keep_running;
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private:
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int assigned_module;
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// functions
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bool Initialize(const char *cfgfile);
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static void SignalCatch(const int signum);
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bool ProcessGateway(const int len, const unsigned char *raw);
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bool ProcessITAP(const unsigned char *raw);
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int OpenITAP();
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int SendTo(const unsigned char *buf);
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REPLY_TYPE GetITAPData(unsigned char *buf);
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void calcPFCS(const unsigned char *packet, unsigned char *pfcs);
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void DumpSerialPacket(const char *title, const unsigned char *);
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// read configuration file
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bool ReadConfig(const char *);
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// config data
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char RPTR_MOD;
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std::string ITAP_DEVICE, RPTR;
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bool log_qso;
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// parameters
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int serfd;
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unsigned char tapcounter;
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// helpers
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CRandom random;
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// unix sockets
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std::string modem2gate, gate2modem;
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CUnixDgramWriter Modem2Gate;
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CUnixDgramReader Gate2Modem;
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// Queue
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std::queue<CFrame> queue;
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bool acknowledged;
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};
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