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382 lines
10 KiB
382 lines
10 KiB
/*
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* Copyright (C) 2018 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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#include <exception>
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#include <cstdio>
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#include <cctype>
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#include <cstring>
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#include <csignal>
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#include <ctime>
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#include <cstdlib>
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#include "versions.h"
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#include "mmdvm_modem.h"
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#include "UDPSocket.h"
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#include "g2_typedefs.h"
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std::atomic<bool> CMMDVMModem::keep_running(true);
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CMMDVMModem::CMMDVMModem() :
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seed(time(NULL)),
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COUNTER(0)
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{
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}
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CMMDVMModem::~CMMDVMModem()
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{
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}
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bool CMMDVMModem::Initialize(const char *cfgfile)
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{
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if (ReadConfig(cfgfile))
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return true;
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struct sigaction act;
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act.sa_handler = &CMMDVMModem::SignalCatch;
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sigemptyset(&act.sa_mask);
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if (sigaction(SIGTERM, &act, 0) != 0) {
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printf("sigaction-TERM failed, error=%d\n", errno);
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return true;
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}
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if (sigaction(SIGHUP, &act, 0) != 0) {
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printf("sigaction-HUP failed, error=%d\n", errno);
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return true;
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}
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if (sigaction(SIGINT, &act, 0) != 0) {
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printf("sigaction-INT failed, error=%d\n", errno);
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return true;
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}
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return false;
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}
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void CMMDVMModem::Run(const char *cfgfile)
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{
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if (Initialize(cfgfile))
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return;
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CUDPSocket MMDVMSock(MMDVM_IP, MMDVM_PORT);
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if (MMDVMSock.open())
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return;
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CUDPSocket GatewaySock(G2_INTERNAL_IP, G2_INTERNAL_PORT);
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if (GatewaySock.open()) {
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MMDVMSock.close();
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return;
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}
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keep_running = true;
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while (keep_running) {
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ProcessMMDVM(GatewaySock, MMDVMSock);
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if (keep_running)
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ProcessGateway(GatewaySock, MMDVMSock);
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}
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MMDVMSock.close();
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GatewaySock.close();
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}
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void CMMDVMModem::ProcessGateway(CUDPSocket &gsock, CUDPSocket &msock)
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{
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SPKT buf;
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unsigned int port;
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// read from gateway
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int len = gsock.read(buf.pkt_id, 58, g2_internal_addr, port);
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if (0 == len)
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return;
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if (0 > len) {
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printf("ERROR: ProcessGateway: Can't read gateway packet\n");
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keep_running = false;
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return;
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}
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// if there is data, translate it and send it to the MMDVM Modem
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if (29==len || 58==len) { //here is dstar data
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SMMDVMPKT pkt;
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memcpy(pkt.title, "DSRP", 4);
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if (29 == len) { // write an AMBE packet
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pkt.tag = 0x21U;
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pkt.voice.id = buf.vpkt.streamid;
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pkt.voice.seq = buf.vpkt.ctrl;
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if (pkt.voice.seq & 0x40)
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printf("INFO: ProcessGateway: sending voice end-of-stream\n");
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else if (pkt.voice.seq > 20)
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printf("DEBUG: ProcessGateway: unexpected voice sequence number %d\n", pkt.voice.seq);
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memcpy(pkt.voice.ambe, buf.vpkt.vasd.text, 12);
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if (false == msock.write(pkt.title, 21, mmdvm_addr, MMDVM_PORT)) {
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printf("ERROR: ProcessGateway: Could not write AMBE mmdvm packet\n");
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keep_running = false;
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return;
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}
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} else { // write a Header packet
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pkt.tag = 0x20U;
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pkt.header.id = buf.vpkt.streamid;
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pkt.header.seq = buf.vpkt.ctrl;
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if (pkt.header.seq) {
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printf("DEBUG: ProcessGateway: unexpected .header.seq %d, resetting to 0\n", pkt.header.seq);
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pkt.header.seq = 0;
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}
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memcpy(pkt.header.flag, buf.vpkt.hdr.flag, 41);
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if (false == msock.write(pkt.title, 49, mmdvm_addr, MMDVM_PORT)) {
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printf("ERROR: ProcessGateway: Could not write Header mmdvm packet\n");
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keep_running = false;
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}
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}
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} else
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printf("DEBUG: ProcessGateway: unusual packet size read len=%d\n", len);
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}
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void CMMDVMModem::ProcessMMDVM(CUDPSocket &gsock, CUDPSocket &msock)
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{
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SMMDVMPKT mpkt;
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static SPKT gpkt; // retain some header values for voice data
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unsigned int mmdvm_port = MMDVM_PORT;
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in_addr addr;
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addr.s_addr = mmdvm_addr.s_addr;
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// read from the MMDVM modem
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int len = msock.read(mpkt.title, 64, addr, mmdvm_port);
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if (0 == len) // no data available
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return;
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if (0 > len) {
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printf("ERROR: ProcessMMDVM: Could not read mmdvm packet\n");
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keep_running = false;
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return;
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}
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// if there is data, translate it and send it to the Gateway
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if (49 == len) {
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// sets most of the params with the header
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memcpy(gpkt.pkt_id, "DSTR", 4);
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gpkt.counter = COUNTER++;
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gpkt.flag[0] = 0x72;
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gpkt.flag[1] = 0x12;
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gpkt.flag[2] = 0x0;
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gpkt.remaining = 0x30;
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gpkt.vpkt.icm_id = 0x20;
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gpkt.vpkt.dst_rptr_id = 0x0;
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gpkt.vpkt.snd_rptr_id = 0x1;
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gpkt.vpkt.snd_term_id = ('B'==RPTR_MOD) ? 0x1 : (('C'==RPTR_MOD) ? 0x2 : 0x3);
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gpkt.vpkt.streamid = (rand_r(&seed) % 65535U) + 1U;
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gpkt.vpkt.ctrl = mpkt.header.seq;
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memcpy(gpkt.vpkt.hdr.flag, mpkt.header.flag, 41);
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if (false == gsock.write(gpkt.pkt_id, 58, g2_internal_addr, (unsigned int)G2_INTERNAL_PORT)) {
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printf("ERROR: ProcessMMDVM: Could not write gateway header packet\n");
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keep_running = false;
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}
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} else if (21 == len) {
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// just a few need updating in a voice data frame
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gpkt.counter = COUNTER++;
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gpkt.remaining = 0x16;
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gpkt.vpkt.ctrl = mpkt.voice.seq;
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memcpy(gpkt.vpkt.vasd.text, mpkt.voice.ambe, 12);
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if (false == gsock.write(gpkt.pkt_id, 29, g2_internal_addr, (unsigned int)G2_INTERNAL_PORT)) {
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printf("ERROR: ProcessMMDVM: Could not write gateway header packet\n");
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keep_running = false;
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}
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} else
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printf("DEBUG: ProcessMMDVM: unusual packet size read len=%d\n", len);
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}
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bool CMMDVMModem::GetValue(const Config &cfg, const char *path, int &value, const int min, const int max, const int default_value)
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{
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if (cfg.lookupValue(path, value)) {
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if (value < min || value > max)
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value = default_value;
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} else
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value = default_value;
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printf("%s = [%d]\n", path, value);
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return true;
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}
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bool CMMDVMModem::GetValue(const Config &cfg, const char *path, double &value, const double min, const double max, const double default_value)
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{
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if (cfg.lookupValue(path, value)) {
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if (value < min || value > max)
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value = default_value;
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} else
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value = default_value;
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printf("%s = [%lg]\n", path, value);
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return true;
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}
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bool CMMDVMModem::GetValue(const Config &cfg, const char *path, bool &value, const bool default_value)
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{
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if (! cfg.lookupValue(path, value))
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value = default_value;
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printf("%s = [%s]\n", path, value ? "true" : "false");
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return true;
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}
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bool CMMDVMModem::GetValue(const Config &cfg, const char *path, std::string &value, int min, int max, const char *default_value)
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{
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if (cfg.lookupValue(path, value)) {
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int l = value.length();
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if (l<min || l>max) {
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printf("%s value '%s' is wrong size\n", path, value.c_str());
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return false;
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}
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} else
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value = default_value;
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printf("%s = [%s]\n", path, value.c_str());
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return true;
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}
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// process configuration file and return true if there was a problem
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bool CMMDVMModem::ReadConfig(const char *cfgFile)
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{
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Config cfg;
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printf("Reading file %s\n", cfgFile);
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// Read the file. If there is an error, report it and exit.
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try {
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cfg.readFile(cfgFile);
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}
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catch(const FileIOException &fioex) {
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printf("Can't read %s\n", cfgFile);
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return true;
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}
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catch(const ParseException &pex) {
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printf("Parse error at %s:%d - %s\n", pex.getFile(), pex.getLine(), pex.getError());
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return true;
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}
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std::string mmdvm_path, value;
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int i;
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for (i=0; i<3; i++) {
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mmdvm_path = "module.";
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mmdvm_path += ('a' + i);
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if (cfg.lookupValue(mmdvm_path + ".type", value)) {
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if (0 == strcasecmp(value.c_str(), "mmdvm"))
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break;
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}
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}
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if (i >= 3) {
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printf("mmdvm not defined in any module!\n");
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return true;
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}
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RPTR_MOD = 'A' + i;
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if (cfg.lookupValue(std::string(mmdvm_path+".callsign").c_str(), value) || cfg.lookupValue("ircddb.login", value)) {
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int l = value.length();
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if (l<3 || l>CALL_SIZE-2) {
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printf("Call '%s' is invalid length!\n", value.c_str());
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return true;
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} else {
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for (i=0; i<l; i++) {
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if (islower(value[i]))
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value[i] = toupper(value[i]);
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}
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value.resize(CALL_SIZE, ' ');
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}
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strcpy(RPTR, value.c_str());
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} else {
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printf("%s.login is not defined!\n", mmdvm_path.c_str());
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return true;
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}
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if (cfg.lookupValue("ircddb.login", value)) {
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int l = value.length();
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if (l<3 || l>CALL_SIZE-2) {
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printf("Call '%s' is invalid length!\n", value.c_str());
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return true;
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} else {
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for (i=0; i<l; i++) {
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if (islower(value[i]))
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value[i] = toupper(value[i]);
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}
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value.resize(CALL_SIZE, ' ');
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}
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strcpy(OWNER, value.c_str());
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printf("ircddb.login = [%s]\n", OWNER);
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} else {
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printf("ircddb.login is not defined!\n");
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return true;
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}
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if (GetValue(cfg, std::string(mmdvm_path+".internal_ip").c_str(), value, 7, IP_SIZE, "0.0.0.0")) {
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MMDVM_IP = value;
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inet_aton(MMDVM_IP.c_str(), &mmdvm_addr);
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} else
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return true;
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GetValue(cfg, std::string(mmdvm_path+".port").c_str(), i, 10000, 65535, 20011);
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MMDVM_PORT = (unsigned short)i;
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if (GetValue(cfg, "gateway.ip", value, 7, IP_SIZE, "127.0.0.1")) {
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G2_INTERNAL_IP = value;
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inet_aton(G2_INTERNAL_IP.c_str(), &g2_internal_addr);
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} else
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return true;
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GetValue(cfg, "gateway.internal.port", i, 10000, 65535, 20010);
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G2_INTERNAL_PORT = (unsigned short)i;
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GetValue(cfg, "timing.play.delay", DELAY_BETWEEN, 9, 25, 19);
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GetValue(cfg, "timing.play.wait", DELAY_BEFORE, 1, 10, 2);
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GetValue(cfg, std::string(mmdvm_path+".acknowledge").c_str(), RPTR_ACK, false);
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GetValue(cfg, std::string(mmdvm_path+".packet_wait").c_str(), WAIT_FOR_PACKETS, 6, 100, 25);
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return false;
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}
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void CMMDVMModem::SignalCatch(int signum)
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{
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if ((signum == SIGTERM) || (signum == SIGINT) || (signum == SIGHUP))
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keep_running = false;
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exit(0);
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}
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int main(int argc, const char **argv)
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{
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setbuf(stdout, NULL);
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if (2 != argc) {
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printf("usage: %s path_to_config_file\n", argv[0]);
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printf(" %s --version\n", argv[0]);
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return 1;
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}
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if ('-' == argv[1][0]) {
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printf("\nMMDVM Modem Version #%s Copyright (C) 2018 by Thomas A. Early N7TAE\n", MMDVM_VERSION);
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printf("MMDVM Modem comes with ABSOLUTELY NO WARRANTY; see the LICENSE for details.\n");
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printf("This is free software, and you are welcome to distribute it\nunder certain conditions that are discussed in the LICENSE file.\n\n");
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return 0;
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}
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CMMDVMModem mmdvm;
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mmdvm.Run(argv[1]);
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printf("%s is closing.\n", argv[0]);
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return 0;
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}
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