P25Clients/P25Gateway/P25Gateway.cpp

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/*
* Copyright (C) 2016,2017,2018 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 "P25Gateway.h"
#include "Reflectors.h"
#include "StopWatch.h"
#include "DMRLookup.h"
#include "Network.h"
#include "Version.h"
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#include "Thread.h"
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#include "Speech.h"
#include "Timer.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 = "P25Gateway.ini";
#else
const char* DEFAULT_INI_FILE = "/etc/P25Gateway.ini";
#endif
#include <cstdio>
#include <cstdlib>
#include <cstdarg>
#include <ctime>
#include <cstring>
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, "P25Gateway version %s\n", VERSION);
return 0;
} else if (arg.substr(0, 1) == "-") {
::fprintf(stderr, "Usage: P25Gateway [-v|--version] [filename]\n");
return 1;
} else {
iniFile = argv[currentArg];
}
}
}
CP25Gateway* gateway = new CP25Gateway(std::string(iniFile));
gateway->run();
delete gateway;
return 0;
}
CP25Gateway::CP25Gateway(const std::string& file) :
m_conf(file)
{
}
CP25Gateway::~CP25Gateway()
{
}
void CP25Gateway::run()
{
bool ret = m_conf.read();
if (!ret) {
::fprintf(stderr, "P25Gateway: 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) {
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::fprintf(stderr, "Couldn't fork() , exiting\n");
return;
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} else if (pid != 0) {
exit(EXIT_SUCCESS);
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}
// Create new session and process group
if (::setsid() == -1) {
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::fprintf(stderr, "Couldn't setsid(), exiting\n");
return;
}
// Set the working directory to the root directory
if (::chdir("/") == -1) {
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::fprintf(stderr, "Couldn't cd /, exiting\n");
return;
}
::close(STDIN_FILENO);
::close(STDOUT_FILENO);
::close(STDERR_FILENO);
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// If we are currently root...
if (getuid() == 0) {
struct passwd* user = ::getpwnam("mmdvm");
if (user == NULL) {
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::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;
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// Set user and group ID's to mmdvm:mmdvm
if (setgid(mmdvm_gid) != 0) {
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::fprintf(stderr, "Could not set mmdvm GID, exiting\n");
return;
}
if (setuid(mmdvm_uid) != 0) {
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::fprintf(stderr, "Could not set mmdvm UID, exiting\n");
return;
}
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// Double check it worked (AKA Paranoia)
if (setuid(0) != -1) {
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::fprintf(stderr, "It's possible to regain root - something is wrong!, exiting\n");
return;
}
}
}
#endif
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ret = ::LogInitialise(m_conf.getLogFilePath(), m_conf.getLogFileRoot(), 1U, 1U);
if (!ret) {
::fprintf(stderr, "P25Gateway: unable to open the log file\n");
return;
}
in_addr rptAddr = CUDPSocket::lookup(m_conf.getRptAddress());
unsigned int rptPort = m_conf.getRptPort();
CNetwork localNetwork(m_conf.getMyPort(), m_conf.getCallsign(), false);
ret = localNetwork.open();
if (!ret) {
::LogFinalise();
return;
}
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CNetwork remoteNetwork(m_conf.getNetworkPort(), m_conf.getCallsign(), m_conf.getNetworkDebug());
ret = remoteNetwork.open();
if (!ret) {
localNetwork.close();
::LogFinalise();
return;
}
CReflectors reflectors(m_conf.getNetworkHosts1(), m_conf.getNetworkHosts2(), m_conf.getNetworkReloadTime());
if (m_conf.getNetworkParrotPort() > 0U)
reflectors.setParrot(m_conf.getNetworkParrotAddress(), m_conf.getNetworkParrotPort());
reflectors.load();
CDMRLookup* lookup = new CDMRLookup(m_conf.getLookupName(), m_conf.getLookupTime());
lookup->read();
CTimer inactivityTimer(1000U, m_conf.getNetworkInactivityTimeout() * 60U);
CTimer lostTimer(1000U, 120U);
CTimer pollTimer(1000U, 5U);
CStopWatch stopWatch;
stopWatch.start();
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CSpeech* speech = NULL;
if (m_conf.getAnnouncements())
speech = new CSpeech(localNetwork, rptAddr, rptPort);
LogMessage("Starting P25Gateway-%s", VERSION);
unsigned int srcId = 0U;
unsigned int dstId = 0U;
unsigned int currentId = 9999U;
in_addr currentAddr;
unsigned int currentPort = 0U;
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unsigned int startupId = m_conf.getNetworkStartup();
if (startupId != 9999U) {
CP25Reflector* reflector = reflectors.find(startupId);
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if (reflector != NULL) {
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currentId = startupId;
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currentAddr = reflector->m_address;
currentPort = reflector->m_port;
inactivityTimer.start();
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pollTimer.start();
lostTimer.start();
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remoteNetwork.writePoll(currentAddr, currentPort);
remoteNetwork.writePoll(currentAddr, currentPort);
remoteNetwork.writePoll(currentAddr, currentPort);
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LogMessage("Linked at startup to reflector %u", currentId);
}
}
for (;;) {
unsigned char buffer[200U];
in_addr address;
unsigned int port;
// From the reflector to the MMDVM
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unsigned int len = remoteNetwork.readData(buffer, 200U, address, port);
if (len > 0U) {
// If we're linked and it's from the right place, send it on
if (currentId != 9999U && currentAddr.s_addr == address.s_addr && currentPort == port) {
// Don't pass reflector control data through to the MMDVM
if (buffer[0U] != 0xF0U && buffer[0U] != 0xF1U) {
// Rewrite the LCF and the destination TG
if (buffer[0U] == 0x64U) {
buffer[1U] = 0x00U; // LCF is for TGs
} else if (buffer[0U] == 0x65U) {
buffer[1U] = (currentId >> 16) & 0xFFU;
buffer[2U] = (currentId >> 8) & 0xFFU;
buffer[3U] = (currentId >> 0) & 0xFFU;
}
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localNetwork.writeData(buffer, len, rptAddr, rptPort);
}
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// Any network activity is proof that the reflector is alive
lostTimer.start();
}
}
// From the MMDVM to the reflector or control data
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len = localNetwork.readData(buffer, 200U, address, port);
if (len > 0U) {
if (buffer[0U] == 0x65U) {
dstId = (buffer[1U] << 16) & 0xFF0000U;
dstId |= (buffer[2U] << 8) & 0x00FF00U;
dstId |= (buffer[3U] << 0) & 0x0000FFU;
} else if (buffer[0U] == 0x66U) {
srcId = (buffer[1U] << 16) & 0xFF0000U;
srcId |= (buffer[2U] << 8) & 0x00FF00U;
srcId |= (buffer[3U] << 0) & 0x0000FFU;
if (dstId != currentId) {
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CP25Reflector* reflector = NULL;
if (dstId != 9999U)
reflector = reflectors.find(dstId);
// If we're unlinking or changing reflectors, unlink from the current one
if (dstId == 9999U || reflector != NULL) {
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);
remoteNetwork.writeUnlink(currentAddr, currentPort);
remoteNetwork.writeUnlink(currentAddr, currentPort);
inactivityTimer.stop();
pollTimer.stop();
lostTimer.stop();
}
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if (speech != NULL)
speech->announce(dstId);
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currentId = dstId;
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}
// Link to the new reflector
if (reflector != NULL) {
currentId = dstId;
currentAddr = reflector->m_address;
currentPort = reflector->m_port;
std::string callsign = lookup->find(srcId);
LogMessage("Linked to reflector %u by %s", currentId, callsign.c_str());
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remoteNetwork.writePoll(currentAddr, currentPort);
remoteNetwork.writePoll(currentAddr, currentPort);
remoteNetwork.writePoll(currentAddr, currentPort);
inactivityTimer.start();
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pollTimer.start();
lostTimer.start();
}
}
} else if (buffer[0U] == 0x80U) {
if (speech != NULL)
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speech->eof();
}
// If we're linked and we have a network, send it on
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if (currentId != 9999U) {
// Rewrite the LCF and the destination TG
if (buffer[0U] == 0x64U) {
buffer[1U] = 0x00U; // LCF is for TGs
} else if (buffer[0U] == 0x65U) {
buffer[1U] = (currentId >> 16) & 0xFFU;
buffer[2U] = (currentId >> 8) & 0xFFU;
buffer[3U] = (currentId >> 0) & 0xFFU;
}
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remoteNetwork.writeData(buffer, len, currentAddr, currentPort);
inactivityTimer.start();
}
}
unsigned int ms = stopWatch.elapsed();
stopWatch.start();
reflectors.clock(ms);
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if (speech != NULL)
speech->clock(ms);
inactivityTimer.clock(ms);
if (inactivityTimer.isRunning() && inactivityTimer.hasExpired()) {
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if (currentId != 9999U && startupId == 9999U) {
LogMessage("Unlinking from %u due to inactivity", currentId);
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remoteNetwork.writeUnlink(currentAddr, currentPort);
remoteNetwork.writeUnlink(currentAddr, currentPort);
remoteNetwork.writeUnlink(currentAddr, currentPort);
if (speech != NULL)
speech->announce(currentId);
currentId = 9999U;
pollTimer.stop();
lostTimer.stop();
inactivityTimer.stop();
} else if (currentId != startupId) {
if (currentId != 9999U) {
remoteNetwork.writeUnlink(currentAddr, currentPort);
remoteNetwork.writeUnlink(currentAddr, currentPort);
remoteNetwork.writeUnlink(currentAddr, currentPort);
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}
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CP25Reflector* reflector = reflectors.find(startupId);
if (reflector != NULL) {
currentId = startupId;
currentAddr = reflector->m_address;
currentPort = reflector->m_port;
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inactivityTimer.start();
pollTimer.start();
lostTimer.start();
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LogMessage("Linked to reflector %u due to inactivity", currentId);
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if (speech != NULL)
speech->announce(currentId);
remoteNetwork.writePoll(currentAddr, currentPort);
remoteNetwork.writePoll(currentAddr, currentPort);
remoteNetwork.writePoll(currentAddr, currentPort);
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} else {
startupId = 9999U;
inactivityTimer.stop();
pollTimer.stop();
lostTimer.stop();
}
}
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}
pollTimer.clock(ms);
if (pollTimer.isRunning() && pollTimer.hasExpired()) {
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if (currentId != 9999U)
remoteNetwork.writePoll(currentAddr, currentPort);
pollTimer.start();
}
lostTimer.clock(ms);
if (lostTimer.isRunning() && lostTimer.hasExpired()) {
if (currentId != 9999U) {
LogWarning("No response from %u, unlinking", currentId);
currentId = 9999U;
}
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inactivityTimer.stop();
lostTimer.stop();
}
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if (ms < 5U)
CThread::sleep(5U);
}
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delete speech;
localNetwork.close();
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remoteNetwork.close();
lookup->stop();
::LogFinalise();
}