mirror of
https://github.com/ShaYmez/P25Clients.git
synced 2024-11-04 18:31:14 -05:00
356 lines
9.1 KiB
C++
356 lines
9.1 KiB
C++
/*
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* Copyright (C) 2016 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 "P25Gateway.h"
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#include "Reflectors.h"
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#include "StopWatch.h"
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#include "DMRLookup.h"
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#include "Network.h"
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#include "Version.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 = "P25Gateway.ini";
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#else
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const char* DEFAULT_INI_FILE = "/etc/P25Gateway.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, "P25Gateway 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: P25Gateway [-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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CP25Gateway* gateway = new CP25Gateway(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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CP25Gateway::CP25Gateway(const std::string& file) :
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m_conf(file)
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{
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}
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CP25Gateway::~CP25Gateway()
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{
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}
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void CP25Gateway::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, "P25Gateway: 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, "P25Gateway: 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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in_addr rptAddr = CUDPSocket::lookup(m_conf.getRptAddress());
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unsigned int rptPort = m_conf.getRptPort();
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CNetwork localNetwork(m_conf.getMyPort(), m_conf.getCallsign(), 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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CNetwork* remoteNetwork = NULL;
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if (m_conf.getNetworkEnabled()) {
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remoteNetwork = new CNetwork(m_conf.getNetworkDataPort(), 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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}
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CReflectors reflectors(m_conf.getNetworkHosts(), 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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CDMRLookup* lookup = new CDMRLookup(m_conf.getLookupName(), m_conf.getLookupTime());
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lookup->read();
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CTimer lostTimer(1000U, 120U);
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CTimer pollTimer(1000U, 20U);
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CStopWatch stopWatch;
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stopWatch.start();
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LogMessage("Starting P25Gateway-%s", VERSION);
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unsigned int srcId = 0U;
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unsigned int dstId = 0U;
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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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if (remoteNetwork != NULL) {
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unsigned int id = m_conf.getNetworkStartup();
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if (id != 9999U) {
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CP25Reflector* 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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pollTimer.start();
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lostTimer.start();
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LogMessage("Linked at startup to reflector %u", currentId);
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}
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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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if (remoteNetwork != NULL) {
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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 (buffer[0U] != 0xF0U && buffer[0U] != 0xF1U) {
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// Rewrite the LCF and the destination TG
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if (buffer[0U] == 0x64U) {
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buffer[1U] = 0x00U; // LCF is for TGs
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} else if (buffer[0U] == 0x65U) {
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buffer[1U] = (currentId >> 16) & 0xFFU;
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buffer[2U] = (currentId >> 8) & 0xFFU;
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buffer[3U] = (currentId >> 0) & 0xFFU;
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}
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localNetwork.writeData(buffer, len, rptAddr, rptPort);
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}
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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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}
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// From the MMDVM to the reflector or control data
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unsigned int len = localNetwork.readData(buffer, 200U, address, port);
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if (len > 0U) {
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if (buffer[0U] == 0x65U) {
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dstId = (buffer[1U] << 16) & 0xFF0000U;
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dstId |= (buffer[2U] << 8) & 0x00FF00U;
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dstId |= (buffer[3U] << 0) & 0x0000FFU;
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} else if (buffer[0U] == 0x66U) {
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srcId = (buffer[1U] << 16) & 0xFF0000U;
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srcId |= (buffer[2U] << 8) & 0x00FF00U;
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srcId |= (buffer[3U] << 0) & 0x0000FFU;
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if (dstId != currentId) {
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if (dstId == 9999U) {
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std::string callsign = lookup->find(srcId);
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LogMessage("Unlinked from reflector %u by %s", currentId, callsign.c_str());
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currentId = dstId;
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if (remoteNetwork != NULL) {
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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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pollTimer.stop();
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lostTimer.stop();
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}
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} else {
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CP25Reflector* reflector = reflectors.find(dstId);
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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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if (remoteNetwork != NULL) {
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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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pollTimer.start();
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lostTimer.start();
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}
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}
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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 && remoteNetwork != NULL) {
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// Rewrite the LCF and the destination TG
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if (buffer[0U] == 0x64U) {
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buffer[1U] = 0x00U; // LCF is for TGs
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} else if (buffer[0U] == 0x65U) {
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buffer[1U] = (currentId >> 16) & 0xFFU;
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buffer[2U] = (currentId >> 8) & 0xFFU;
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buffer[3U] = (currentId >> 0) & 0xFFU;
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}
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remoteNetwork->writeData(buffer, len, currentAddr, currentPort);
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}
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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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pollTimer.clock(ms);
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if (pollTimer.isRunning() && pollTimer.hasExpired()) {
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if (currentId != 9999U && remoteNetwork != NULL)
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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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lostTimer.stop();
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}
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if (ms < 5U) {
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#if defined(_WIN32) || defined(_WIN64)
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::Sleep(5UL); // 5ms
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#else
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::usleep(5000); // 5ms
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#endif
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}
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}
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localNetwork.close();
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if (remoteNetwork != NULL) {
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remoteNetwork->close();
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delete remoteNetwork;
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}
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lookup->stop();
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::LogFinalise();
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}
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