381 lines
9.5 KiB
C++
381 lines
9.5 KiB
C++
/*
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* Copyright (C) 2016,2017,2018 by Jonathan Naylor G4KLX
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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 "IcomNetwork.h"
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#include "NXDNNetwork.h"
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#include "NXDNGateway.h"
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#include "NXDNLookup.h"
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#include "Reflectors.h"
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#include "StopWatch.h"
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#include "Version.h"
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#include "Thread.h"
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#include "Voice.h"
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#include "Timer.h"
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#include "Log.h"
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#if defined(_WIN32) || defined(_WIN64)
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#include <Windows.h>
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#else
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <arpa/inet.h>
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#include <sys/time.h>
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#include <sys/types.h>
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#include <unistd.h>
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#include <signal.h>
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#include <fcntl.h>
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#include <pwd.h>
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#endif
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#if defined(_WIN32) || defined(_WIN64)
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const char* DEFAULT_INI_FILE = "NXDNGateway.ini";
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#else
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const char* DEFAULT_INI_FILE = "/etc/NXDNGateway.ini";
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#endif
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#include <cstdio>
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#include <cstdlib>
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#include <cstdarg>
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#include <ctime>
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#include <cstring>
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int main(int argc, char** argv)
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{
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const char* iniFile = DEFAULT_INI_FILE;
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if (argc > 1) {
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for (int currentArg = 1; currentArg < argc; ++currentArg) {
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std::string arg = argv[currentArg];
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if ((arg == "-v") || (arg == "--version")) {
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::fprintf(stdout, "NXDNGateway version %s\n", VERSION);
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return 0;
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} else if (arg.substr(0, 1) == "-") {
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::fprintf(stderr, "Usage: NXDNGateway [-v|--version] [filename]\n");
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return 1;
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} else {
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iniFile = argv[currentArg];
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}
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}
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}
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CNXDNGateway* gateway = new CNXDNGateway(std::string(iniFile));
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gateway->run();
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delete gateway;
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return 0;
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}
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CNXDNGateway::CNXDNGateway(const std::string& file) :
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m_conf(file)
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{
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}
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CNXDNGateway::~CNXDNGateway()
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{
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}
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void CNXDNGateway::run()
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{
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bool ret = m_conf.read();
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if (!ret) {
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::fprintf(stderr, "NXDNGateway: cannot read the .ini file\n");
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return;
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}
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ret = ::LogInitialise(m_conf.getLogFilePath(), m_conf.getLogFileRoot(), 1U, 1U);
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if (!ret) {
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::fprintf(stderr, "NXDNGateway: unable to open the log file\n");
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return;
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}
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#if !defined(_WIN32) && !defined(_WIN64)
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bool m_daemon = m_conf.getDaemon();
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if (m_daemon) {
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// Create new process
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pid_t pid = ::fork();
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if (pid == -1) {
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::LogWarning("Couldn't fork() , exiting");
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return;
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}
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else if (pid != 0)
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exit(EXIT_SUCCESS);
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// Create new session and process group
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if (::setsid() == -1) {
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::LogWarning("Couldn't setsid(), exiting");
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return;
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}
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// Set the working directory to the root directory
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if (::chdir("/") == -1) {
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::LogWarning("Couldn't cd /, exiting");
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return;
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}
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::close(STDIN_FILENO);
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::close(STDOUT_FILENO);
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::close(STDERR_FILENO);
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//If we are currently root...
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if (getuid() == 0) {
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struct passwd* user = ::getpwnam("mmdvm");
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if (user == NULL) {
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::LogError("Could not get the mmdvm user, exiting");
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return;
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}
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uid_t mmdvm_uid = user->pw_uid;
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gid_t mmdvm_gid = user->pw_gid;
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//Set user and group ID's to mmdvm:mmdvm
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if (setgid(mmdvm_gid) != 0) {
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::LogWarning("Could not set mmdvm GID, exiting");
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return;
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}
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if (setuid(mmdvm_uid) != 0) {
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::LogWarning("Could not set mmdvm UID, exiting");
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return;
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}
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//Double check it worked (AKA Paranoia)
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if (setuid(0) != -1) {
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::LogWarning("It's possible to regain root - something is wrong!, exiting");
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return;
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}
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}
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}
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#endif
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CIcomNetwork localNetwork(m_conf.getMyAddress(), m_conf.getMyPort(), m_conf.getRptAddress(), m_conf.getRptPort(), false);
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ret = localNetwork.open();
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if (!ret) {
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::LogFinalise();
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return;
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}
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CNXDNNetwork remoteNetwork(m_conf.getNetworkPort(), m_conf.getCallsign(), m_conf.getNetworkDebug());
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ret = remoteNetwork.open();
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if (!ret) {
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localNetwork.close();
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::LogFinalise();
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return;
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}
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CReflectors reflectors(m_conf.getNetworkHosts1(), m_conf.getNetworkHosts2(), m_conf.getNetworkReloadTime());
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if (m_conf.getNetworkParrotPort() > 0U)
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reflectors.setParrot(m_conf.getNetworkParrotAddress(), m_conf.getNetworkParrotPort());
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reflectors.load();
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CNXDNLookup* lookup = new CNXDNLookup(m_conf.getLookupName(), m_conf.getLookupTime());
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lookup->read();
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CTimer inactivityTimer(1000U, m_conf.getNetworkInactivityTimeout() * 60U);
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CTimer lostTimer(1000U, 120U);
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CTimer pollTimer(1000U, 5U);
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CStopWatch stopWatch;
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stopWatch.start();
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CVoice* voice = NULL;
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if (m_conf.getVoiceEnabled())
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voice = new CVoice(m_conf.getVoiceDirectory(), m_conf.getVoiceLanguage(), 1U);
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LogMessage("Starting NXDNGateway-%s", VERSION);
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unsigned short srcId = 0U;
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unsigned short dstId = 0U;
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bool grp = false;
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unsigned int currentId = 9999U;
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in_addr currentAddr;
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unsigned int currentPort = 0U;
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unsigned int id = m_conf.getNetworkStartup();
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if (id != 9999U) {
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CNXDNReflector* reflector = reflectors.find(id);
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if (reflector != NULL) {
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currentId = id;
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currentAddr = reflector->m_address;
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currentPort = reflector->m_port;
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inactivityTimer.start();
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pollTimer.start();
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lostTimer.start();
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remoteNetwork.writePoll(currentAddr, currentPort);
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remoteNetwork.writePoll(currentAddr, currentPort);
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remoteNetwork.writePoll(currentAddr, currentPort);
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LogMessage("Linked at startup to reflector %u", currentId);
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}
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}
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for (;;) {
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unsigned char buffer[200U];
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in_addr address;
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unsigned int port;
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// From the reflector to the MMDVM
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unsigned int len = remoteNetwork.readData(buffer, 200U, address, port);
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if (len > 0U) {
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// If we're linked and it's from the right place, send it on
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if (currentId != 9999U && currentAddr.s_addr == address.s_addr && currentPort == port) {
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// Don't pass reflector control data through to the MMDVM
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if (::memcmp(buffer, "NXDND", 5U) == 0)
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localNetwork.write(buffer + 10U, len - 10U);
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// Any network activity is proof that the reflector is alive
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lostTimer.start();
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}
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}
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// From the MMDVM to the reflector or control data
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len = localNetwork.read(buffer);
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if (len > 0U) {
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if (buffer[0U] == 0x81U || buffer[0U] == 0x83U) {
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grp = (buffer[7U] & 0x20U) == 0x20U;
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srcId = (buffer[8U] << 8) & 0xFF00U;
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srcId |= (buffer[9U] << 0) & 0x00FFU;
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dstId = (buffer[10U] << 8) & 0xFF00U;
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dstId |= (buffer[11U] << 0) & 0x00FFU;
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if (dstId != currentId) {
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CNXDNReflector* reflector = NULL;
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if (dstId != 9999U)
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reflector = reflectors.find(dstId);
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// If we're unlinking or changing reflectors, unlink from the current one
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if (dstId == 9999U || reflector != NULL) {
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std::string callsign = lookup->find(srcId);
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if (currentId != 9999U) {
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LogMessage("Unlinked from reflector %u by %s", currentId, callsign.c_str());
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remoteNetwork.writeUnlink(currentAddr, currentPort);
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remoteNetwork.writeUnlink(currentAddr, currentPort);
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remoteNetwork.writeUnlink(currentAddr, currentPort);
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inactivityTimer.stop();
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pollTimer.stop();
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lostTimer.stop();
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}
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if (voice != NULL)
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voice->linkedTo(dstId);
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currentId = dstId;
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}
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// Link to the new reflector
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if (reflector != NULL) {
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currentId = dstId;
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currentAddr = reflector->m_address;
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currentPort = reflector->m_port;
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std::string callsign = lookup->find(srcId);
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LogMessage("Linked to reflector %u by %s", currentId, callsign.c_str());
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remoteNetwork.writePoll(currentAddr, currentPort);
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remoteNetwork.writePoll(currentAddr, currentPort);
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remoteNetwork.writePoll(currentAddr, currentPort);
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inactivityTimer.start();
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pollTimer.start();
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lostTimer.start();
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}
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}
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}
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// If we're linked and we have a network, send it on
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if (currentId != 9999U) {
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remoteNetwork.writeData(buffer, len, srcId, dstId, grp, currentAddr, currentPort);
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inactivityTimer.start();
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}
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}
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if (voice != NULL) {
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unsigned int length = voice->read(buffer);
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if (length > 0U)
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localNetwork.write(buffer, length);
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}
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unsigned int ms = stopWatch.elapsed();
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stopWatch.start();
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reflectors.clock(ms);
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if (voice != NULL)
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voice->clock(ms);
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inactivityTimer.clock(ms);
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if (inactivityTimer.isRunning() && inactivityTimer.hasExpired()) {
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if (currentId != 9999U) {
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LogMessage("Unlinking from %u due to inactivity", currentId);
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remoteNetwork.writeUnlink(currentAddr, currentPort);
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remoteNetwork.writeUnlink(currentAddr, currentPort);
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remoteNetwork.writeUnlink(currentAddr, currentPort);
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if (voice != NULL)
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voice->unlinked();
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currentId = 9999U;
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pollTimer.stop();
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lostTimer.stop();
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}
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inactivityTimer.stop();
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}
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pollTimer.clock(ms);
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if (pollTimer.isRunning() && pollTimer.hasExpired()) {
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if (currentId != 9999U)
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remoteNetwork.writePoll(currentAddr, currentPort);
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pollTimer.start();
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}
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lostTimer.clock(ms);
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if (lostTimer.isRunning() && lostTimer.hasExpired()) {
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if (currentId != 9999U) {
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LogWarning("No response from %u, unlinking", currentId);
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currentId = 9999U;
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}
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inactivityTimer.stop();
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lostTimer.stop();
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}
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localNetwork.clock(ms);
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if (ms < 5U)
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CThread::sleep(5U);
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}
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delete voice;
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localNetwork.close();
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remoteNetwork.close();
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lookup->stop();
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::LogFinalise();
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}
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