P25Clients/P25Reflector/P25Reflector.cpp
2020-09-03 14:00:48 +01:00

352 lines
8.8 KiB
C++

/*
* Copyright (C) 2016,2018,2020 by Jonathan Naylor G4KLX
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include "P25Reflector.h"
#include "StopWatch.h"
#include "DMRLookup.h"
#include "Network.h"
#include "Version.h"
#include "Thread.h"
#include "Utils.h"
#include "Log.h"
#if defined(_WIN32) || defined(_WIN64)
#include <Windows.h>
#else
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <sys/time.h>
#include <sys/types.h>
#include <unistd.h>
#include <signal.h>
#include <fcntl.h>
#include <pwd.h>
#endif
#if defined(_WIN32) || defined(_WIN64)
const char* DEFAULT_INI_FILE = "P25Reflector.ini";
#else
const char* DEFAULT_INI_FILE = "/etc/P25Reflector.ini";
#endif
#include <cstdio>
#include <cstdlib>
#include <cstdarg>
#include <ctime>
#include <cstring>
#include <algorithm>
int main(int argc, char** argv)
{
const char* iniFile = DEFAULT_INI_FILE;
if (argc > 1) {
for (int currentArg = 1; currentArg < argc; ++currentArg) {
std::string arg = argv[currentArg];
if ((arg == "-v") || (arg == "--version")) {
::fprintf(stdout, "P25Reflector version %s\n", VERSION);
return 0;
} else if (arg.substr(0, 1) == "-") {
::fprintf(stderr, "Usage: P25Reflector [-v|--version] [filename]\n");
return 1;
} else {
iniFile = argv[currentArg];
}
}
}
CP25Reflector* reflector = new CP25Reflector(std::string(iniFile));
reflector->run();
delete reflector;
return 0;
}
CP25Reflector::CP25Reflector(const std::string& file) :
m_conf(file),
m_repeaters()
{
}
CP25Reflector::~CP25Reflector()
{
}
void CP25Reflector::run()
{
bool ret = m_conf.read();
if (!ret) {
::fprintf(stderr, "P25Reflector: cannot read the .ini file\n");
return;
}
#if !defined(_WIN32) && !defined(_WIN64)
bool m_daemon = m_conf.getDaemon();
if (m_daemon) {
// Create new process
pid_t pid = ::fork();
if (pid == -1) {
::fprintf(stderr, "Couldn't fork() , exiting\n");
return;
} else if (pid != 0) {
exit(EXIT_SUCCESS);
}
// Create new session and process group
if (::setsid() == -1) {
::fprintf(stderr, "Couldn't setsid(), exiting\n");
return;
}
// Set the working directory to the root directory
if (::chdir("/") == -1) {
::fprintf(stderr, "Couldn't cd /, exiting\n");
return;
}
// If we are currently root...
if (getuid() == 0) {
struct passwd* user = ::getpwnam("mmdvm");
if (user == NULL) {
::fprintf(stderr, "Could not get the mmdvm user, exiting\n");
return;
}
uid_t mmdvm_uid = user->pw_uid;
gid_t mmdvm_gid = user->pw_gid;
// Set user and group ID's to mmdvm:mmdvm
if (setgid(mmdvm_gid) != 0) {
::fprintf(stderr, "Could not set mmdvm GID, exiting\n");
return;
}
if (setuid(mmdvm_uid) != 0) {
::fprintf(stderr, "Could not set mmdvm UID, exiting\n");
return;
}
// Double check it worked (AKA Paranoia)
if (setuid(0) != -1) {
::fprintf(stderr, "It's possible to regain root - something is wrong!, exiting\n");
return;
}
}
}
#endif
ret = ::LogInitialise(m_conf.getLogFilePath(), m_conf.getLogFileRoot(), m_conf.getLogFileLevel(), m_conf.getLogDisplayLevel());
if (!ret) {
::fprintf(stderr, "P25Gateway: unable to open the log file\n");
return;
}
#if !defined(_WIN32) && !defined(_WIN64)
if (m_daemon) {
::close(STDIN_FILENO);
::close(STDOUT_FILENO);
::close(STDERR_FILENO);
}
#endif
CNetwork network(m_conf.getNetworkPort(), m_conf.getNetworkDebug());
ret = network.open();
if (!ret) {
::LogFinalise();
return;
}
CDMRLookup* lookup = new CDMRLookup(m_conf.getLookupName(), m_conf.getLookupTime());
lookup->read();
CStopWatch stopWatch;
stopWatch.start();
CTimer dumpTimer(1000U, 120U);
dumpTimer.start();
LogMessage("Starting P25Reflector-%s", VERSION);
CP25Repeater* current = NULL;
bool displayed = false;
bool seen64 = false;
bool seen65 = false;
CTimer watchdogTimer(1000U, 0U, 1500U);
unsigned char lcf = 0U;
unsigned int srcId = 0U;
unsigned int dstId = 0U;
for (;;) {
unsigned char buffer[200U];
sockaddr_storage addr;
unsigned int addrLen;
unsigned int len = network.readData(buffer, 200U, addr, addrLen);
if (len > 0U) {
CP25Repeater* rpt = findRepeater(addr);
if (buffer[0U] == 0xF0U) {
if (rpt == NULL) {
rpt = new CP25Repeater;
rpt->m_timer.start();
rpt->m_addr = addr;
rpt->m_addrLen = addrLen;
rpt->m_callsign = std::string((char*)(buffer + 1U), 10U);
m_repeaters.push_back(rpt);
LogMessage("Adding %s", rpt->m_callsign.c_str());
} else {
rpt->m_timer.start();
}
// Return the poll
network.writeData(buffer, len, addr, addrLen);
} else if (buffer[0U] == 0xF1U && rpt != NULL) {
LogMessage("Removing %s unlinked", rpt->m_callsign.c_str());
for (std::vector<CP25Repeater*>::iterator it = m_repeaters.begin(); it != m_repeaters.end(); ++it) {
CP25Repeater* itRpt = *it;
if (CUDPSocket::match(itRpt->m_addr, rpt->m_addr)) {
m_repeaters.erase(it);
delete itRpt;
break;
}
}
} else if (rpt != NULL) {
rpt->m_timer.start();
if (current == NULL) {
current = rpt;
displayed = false;
seen64 = false;
seen65 = false;
LogMessage("Transmission started from %s", current->m_callsign.c_str());
}
if (current == rpt) {
watchdogTimer.start();
if (buffer[0U] == 0x64U && !seen64) {
lcf = buffer[1U];
seen64 = true;
}
if (buffer[0U] == 0x65U && !seen65) {
dstId = (buffer[1U] << 16) & 0xFF0000U;
dstId |= (buffer[2U] << 8) & 0x00FF00U;
dstId |= (buffer[3U] << 0) & 0x0000FFU;
seen65 = true;
}
if (buffer[0U] == 0x66U && seen64 && seen65 && !displayed) {
srcId = (buffer[1U] << 16) & 0xFF0000U;
srcId |= (buffer[2U] << 8) & 0x00FF00U;
srcId |= (buffer[3U] << 0) & 0x0000FFU;
displayed = true;
std::string callsign = lookup->find(srcId);
LogMessage("Transmission from %s at %s to %s%u", callsign.c_str(), current->m_callsign.c_str(), lcf == 0x00U ? "TG " : "", dstId);
}
for (std::vector<CP25Repeater*>::const_iterator it = m_repeaters.begin(); it != m_repeaters.end(); ++it) {
if (!CUDPSocket::match(addr, (*it)->m_addr))
network.writeData(buffer, len, (*it)->m_addr, (*it)->m_addrLen);
}
if (buffer[0U] == 0x80U) {
LogMessage("Received end of transmission");
watchdogTimer.stop();
current = NULL;
}
}
} else {
LogMessage("Data received from an unknown source");
CUtils::dump(2U, "Data", buffer, len);
}
}
unsigned int ms = stopWatch.elapsed();
stopWatch.start();
// Remove any repeaters that haven't reported for a while
for (std::vector<CP25Repeater*>::iterator it = m_repeaters.begin(); it != m_repeaters.end(); ++it)
(*it)->m_timer.clock(ms);
for (std::vector<CP25Repeater*>::iterator it = m_repeaters.begin(); it != m_repeaters.end(); ++it) {
CP25Repeater* itRpt = *it;
if (itRpt->m_timer.hasExpired()) {
LogMessage("Removing %s disappeared", itRpt->m_callsign.c_str());
m_repeaters.erase(it);
delete itRpt;
break;
}
}
watchdogTimer.clock(ms);
if (watchdogTimer.isRunning() && watchdogTimer.hasExpired()) {
LogMessage("Network watchdog has expired");
watchdogTimer.stop();
current = NULL;
}
dumpTimer.clock(ms);
if (dumpTimer.hasExpired()) {
dumpRepeaters();
dumpTimer.start();
}
if (ms < 5U)
CThread::sleep(5U);
}
network.close();
lookup->stop();
::LogFinalise();
}
CP25Repeater* CP25Reflector::findRepeater(const sockaddr_storage& addr) const
{
for (std::vector<CP25Repeater*>::const_iterator it = m_repeaters.begin(); it != m_repeaters.end(); ++it) {
if (CUDPSocket::match(addr, (*it)->m_addr))
return *it;
}
return NULL;
}
void CP25Reflector::dumpRepeaters() const
{
if (m_repeaters.size() == 0U) {
LogMessage("No repeaters linked");
return;
}
LogMessage("Currently linked repeaters:");
for (std::vector<CP25Repeater*>::const_iterator it = m_repeaters.begin(); it != m_repeaters.end(); ++it) {
std::string callsign = (*it)->m_callsign;
unsigned int timer = (*it)->m_timer.getTimer();
unsigned int timeout = (*it)->m_timer.getTimeout();
LogMessage(" %s %u/%u", callsign.c_str(), timer, timeout);
}
}