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https://github.com/ShaYmez/P25Clients.git
synced 2026-06-07 00:14:40 -04:00
Add the P25 Reflector.
This commit is contained in:
Jonathan Naylor
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/*
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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 "P25Reflector.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 "Thread.h"
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#include "Utils.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 = "P25Reflector.ini";
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#else
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const char* DEFAULT_INI_FILE = "/etc/P25Reflector.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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#include <algorithm>
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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, "P25Reflector 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: P25Reflector [-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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CP25Reflector* reflector = new CP25Reflector(std::string(iniFile));
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reflector->run();
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delete reflector;
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return 0;
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}
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CP25Reflector::CP25Reflector(const std::string& file) :
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m_conf(file),
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m_repeaters()
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{
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}
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CP25Reflector::~CP25Reflector()
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{
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}
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void CP25Reflector::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, "P25Reflector: 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(), m_conf.getLogFileLevel(), m_conf.getLogDisplayLevel());
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if (!ret) {
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::fprintf(stderr, "P25Reflector: 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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CNetwork network(m_conf.getNetworkPort(), m_conf.getNetworkDebug());
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ret = network.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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CDMRLookup* lookup = new CDMRLookup(m_conf.getLookupName(), m_conf.getLookupTime());
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lookup->read();
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CStopWatch stopWatch;
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stopWatch.start();
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CTimer dumpTimer(1000U, 120U);
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dumpTimer.start();
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LogMessage("Starting P25Reflector-%s", VERSION);
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CP25Repeater* current = NULL;
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bool displayed = false;
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bool seen64 = false;
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bool seen65 = false;
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CTimer watchdogTimer(1000U, 0U, 1500U);
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unsigned char lcf = 0U;
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unsigned int srcId = 0U;
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unsigned int dstId = 0U;
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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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unsigned int len = network.readData(buffer, 200U, address, port);
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if (len > 0U) {
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CP25Repeater* rpt = findRepeater(address, port);
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if (buffer[0U] == 0xF0U) {
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if (rpt == NULL) {
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rpt = new CP25Repeater;
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rpt->m_timer.start();
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rpt->m_address = address;
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rpt->m_port = port;
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rpt->m_callsign = std::string((char*)(buffer + 1U), 10U);
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m_repeaters.push_back(rpt);
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LogMessage("Adding %s (%s:%u)", rpt->m_callsign.c_str(), ::inet_ntoa(address), port);
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} else {
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rpt->m_timer.start();
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}
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// Return the poll
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network.writeData(buffer, len, address, port);
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} else if (buffer[0U] == 0xF1U && rpt != NULL) {
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LogMessage("Removing %s (%s:%u) unlinked", rpt->m_callsign.c_str(), ::inet_ntoa(address), port);
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for (std::vector<CP25Repeater*>::iterator it = m_repeaters.begin(); it != m_repeaters.end(); ++it) {
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CP25Repeater* itRpt = *it;
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if (itRpt->m_address.s_addr == rpt->m_address.s_addr && itRpt->m_port == rpt->m_port) {
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m_repeaters.erase(it);
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delete itRpt;
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break;
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}
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}
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} else if (rpt != NULL) {
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rpt->m_timer.start();
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if (current == NULL) {
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current = rpt;
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displayed = false;
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seen64 = false;
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seen65 = false;
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LogMessage("Transmission started from %s (%s:%u)", current->m_callsign.c_str(), ::inet_ntoa(address), port);
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}
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if (current == rpt) {
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watchdogTimer.start();
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if (buffer[0U] == 0x64U && !seen64) {
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lcf = buffer[1U];
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seen64 = true;
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}
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if (buffer[0U] == 0x65U && !seen65) {
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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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seen65 = true;
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}
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if (buffer[0U] == 0x66U && seen64 && seen65 && !displayed) {
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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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displayed = true;
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std::string callsign = lookup->find(srcId);
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LogMessage("Transmission from %s at %s to %s%u", callsign.c_str(), current->m_callsign.c_str(), lcf == 0x00U ? "TG " : "", dstId);
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}
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for (std::vector<CP25Repeater*>::const_iterator it = m_repeaters.begin(); it != m_repeaters.end(); ++it) {
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in_addr addr = (*it)->m_address;
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unsigned int prt = (*it)->m_port;
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if (addr.s_addr != address.s_addr || prt != port)
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network.writeData(buffer, len, addr, prt);
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}
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if (buffer[0U] == 0x80U) {
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LogMessage("Received end of transmission");
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watchdogTimer.stop();
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current = NULL;
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}
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}
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} else {
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LogMessage("Data received from an unknown source - %s:%u", ::inet_ntoa(address), port);
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CUtils::dump(2U, "Data", buffer, len);
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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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// Remove any repeaters that haven't reported for a while
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for (std::vector<CP25Repeater*>::iterator it = m_repeaters.begin(); it != m_repeaters.end(); ++it)
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(*it)->m_timer.clock(ms);
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for (std::vector<CP25Repeater*>::iterator it = m_repeaters.begin(); it != m_repeaters.end(); ++it) {
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CP25Repeater* itRpt = *it;
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if (itRpt->m_timer.hasExpired()) {
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in_addr address = itRpt->m_address;
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unsigned int port = itRpt->m_port;
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std::string callsign = itRpt->m_callsign;
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LogMessage("Removing %s (%s:%u) disappeared", callsign.c_str(), ::inet_ntoa(address), port);
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m_repeaters.erase(it);
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delete itRpt;
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break;
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}
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}
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watchdogTimer.clock(ms);
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if (watchdogTimer.isRunning() && watchdogTimer.hasExpired()) {
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LogMessage("Network watchdog has expired");
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watchdogTimer.stop();
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current = NULL;
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}
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dumpTimer.clock(ms);
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if (dumpTimer.hasExpired()) {
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dumpRepeaters();
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dumpTimer.start();
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}
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if (ms < 5U)
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CThread::sleep(5U);
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}
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network.close();
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lookup->stop();
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::LogFinalise();
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}
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CP25Repeater* CP25Reflector::findRepeater(const in_addr& address, unsigned int port) const
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{
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for (std::vector<CP25Repeater*>::const_iterator it = m_repeaters.begin(); it != m_repeaters.end(); ++it) {
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if (address.s_addr == (*it)->m_address.s_addr && (*it)->m_port == port)
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return *it;
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}
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return NULL;
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}
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void CP25Reflector::dumpRepeaters() const
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{
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if (m_repeaters.size() == 0U) {
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LogMessage("No repeaters linked");
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return;
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}
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LogMessage("Currently linked repeaters:");
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for (std::vector<CP25Repeater*>::const_iterator it = m_repeaters.begin(); it != m_repeaters.end(); ++it) {
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in_addr address = (*it)->m_address;
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unsigned int port = (*it)->m_port;
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std::string callsign = (*it)->m_callsign;
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unsigned int timer = (*it)->m_timer.getTimer();
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unsigned int timeout = (*it)->m_timer.getTimeout();
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LogMessage(" %s (%s:%u) %u/%u", callsign.c_str(), ::inet_ntoa(address), port, timer, timeout);
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}
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}
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