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NXDNClients/NXDNReflector/NXDNReflector.cpp
Jonathan Naylor e281095a79 Close the fds after log initialisation.
2018-07-26 20:43:27 +01:00

476 lines
13 KiB
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/*
* Copyright (C) 2016,2018 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 "NXDNReflector.h"
#include "NXDNNetwork.h"
#include "NXDNLookup.h"
#include "StopWatch.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 = "NXDNReflector.ini";
#else
const char* DEFAULT_INI_FILE = "/etc/NXDNReflector.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, "NXDNReflector version %s\n", VERSION);
return 0;
} else if (arg.substr(0, 1) == "-") {
::fprintf(stderr, "Usage: NXDNReflector [-v|--version] [filename]\n");
return 1;
} else {
iniFile = argv[currentArg];
}
}
}
CNXDNReflector* reflector = new CNXDNReflector(std::string(iniFile));
reflector->run();
delete reflector;
return 0;
}
CNXDNReflector::CNXDNReflector(const std::string& file) :
m_conf(file),
m_nxCoreNetwork(NULL),
m_repeaters()
{
}
CNXDNReflector::~CNXDNReflector()
{
}
void CNXDNReflector::run()
{
bool ret = m_conf.read();
if (!ret) {
::fprintf(stderr, "NXDNReflector: 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, "NXDNReflector: 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
unsigned short tg = m_conf.getTG();
CNXDNNetwork nxdnNetwork(m_conf.getNetworkPort(), m_conf.getNetworkDebug());
ret = nxdnNetwork.open();
if (!ret) {
::LogFinalise();
return;
}
unsigned short nxCoreTGEnable = 0U;
unsigned short nxCoreTGDisable = 0U;
if (m_conf.getNXCoreEnabled()) {
ret = openNXCore();
if (!ret) {
nxdnNetwork.close();
::LogFinalise();
return;
}
nxCoreTGEnable = m_conf.getNXCoreTGEnable();
nxCoreTGDisable = m_conf.getNXCoreTGDisable();
}
CNXDNLookup* lookup = new CNXDNLookup(m_conf.getLookupName(), m_conf.getLookupTime());
lookup->read();
CStopWatch stopWatch;
stopWatch.start();
CTimer dumpTimer(1000U, 120U);
dumpTimer.start();
LogMessage("Starting NXDNReflector-%s", VERSION);
CNXDNRepeater* current = NULL;
bool nxCoreActive = false;
unsigned short srcId = 0U;
unsigned short dstId = 0U;
bool grp = false;
CTimer watchdogTimer(1000U, 0U, 1500U);
for (;;) {
unsigned char buffer[200U];
in_addr address;
unsigned int port;
unsigned int len = nxdnNetwork.read(buffer, 200U, address, port);
if (len > 0U) {
CNXDNRepeater* rpt = findRepeater(address, port);
if (::memcmp(buffer, "NXDNP", 5U) == 0 && len == 17U) {
unsigned short id = (buffer[15U] << 8) | buffer[16U];
if (id == tg) {
if (rpt == NULL) {
rpt = new CNXDNRepeater;
rpt->m_timer.start();
rpt->m_address = address;
rpt->m_port = port;
rpt->m_callsign = std::string((char*)(buffer + 5U), 10U);
m_repeaters.push_back(rpt);
LogMessage("Adding %s (%s:%u)", rpt->m_callsign.c_str(), ::inet_ntoa(address), port);
} else {
rpt->m_timer.start();
}
// Return the poll
nxdnNetwork.write(buffer, len, address, port);
}
} else if (::memcmp(buffer, "NXDNU", 5U) == 0 && len == 17U) {
unsigned short id = (buffer[15U] << 8) | buffer[16U];
if (id == tg) {
if (rpt != NULL) {
std::string callsign = std::string((char*)(buffer + 5U), 10U);
LogMessage("Removing %s (%s:%u)", callsign.c_str(), ::inet_ntoa(address), port);
for (std::vector<CNXDNRepeater*>::iterator it = m_repeaters.begin(); it != m_repeaters.end(); ++it) {
if (*it == rpt) {
m_repeaters.erase(it);
break;
}
}
delete rpt;
}
}
} else if (::memcmp(buffer, "NXDND", 5U) == 0 && len == 43U) {
if (rpt != NULL) {
unsigned short srcId = (buffer[5U] << 8) | buffer[6U];
unsigned short dstId = (buffer[7U] << 8) | buffer[8U];
bool grp = (buffer[9U] & 0x01U) == 0x01U;
if (nxCoreTGEnable != 0U && grp && dstId == nxCoreTGEnable) {
if (m_nxCoreNetwork == NULL) {
std::string callsign = lookup->find(srcId);
LogMessage("NXCore link enabled by %s at %s", callsign.c_str(), current->m_callsign.c_str());
bool ok = openNXCore();
if (!ok)
LogWarning("Unable to open the NXCore link");
}
} else if (nxCoreTGDisable != 0U && grp && dstId == nxCoreTGDisable) {
if (m_nxCoreNetwork != NULL) {
std::string callsign = lookup->find(srcId);
LogMessage("NXCore link disabled by %s at %s", callsign.c_str(), current->m_callsign.c_str());
closeNXCore();
}
} else if (grp && dstId == tg) {
rpt->m_timer.start();
if (current == NULL && !nxCoreActive) {
current = rpt;
std::string callsign = lookup->find(srcId);
LogMessage("Transmission from %s at %s to %s%u", callsign.c_str(), current->m_callsign.c_str(), grp ? "TG " : "", dstId);
}
if (current == rpt) {
watchdogTimer.start();
for (std::vector<CNXDNRepeater*>::const_iterator it = m_repeaters.begin(); it != m_repeaters.end(); ++it) {
in_addr addr = (*it)->m_address;
unsigned int prt = (*it)->m_port;
if (addr.s_addr != address.s_addr || prt != port)
nxdnNetwork.write(buffer, len, addr, prt);
}
if (m_nxCoreNetwork != NULL)
m_nxCoreNetwork->write(buffer, len);
if ((buffer[9U] & 0x08U) == 0x08U) {
LogMessage("Received end of transmission");
watchdogTimer.stop();
current = NULL;
}
}
}
} else {
LogMessage("Data received from an unknown source - %s:%u", ::inet_ntoa(address), port);
CUtils::dump(2U, "Data", buffer, len);
}
}
}
if (m_nxCoreNetwork != NULL) {
len = m_nxCoreNetwork->read(buffer);
if (len > 0U) {
if (current == NULL) {
if (!nxCoreActive) {
if ((buffer[0U] == 0x81U || buffer[0U] == 0x83U) && buffer[5U] == 0x01U) {
bool tempGrp = (buffer[7U] & 0x20U) == 0x20U;
unsigned short tempSrcId = (buffer[8U] << 8) | buffer[9U];
unsigned short tempDstId = (buffer[10U] << 8) | buffer[11U];
if (tempGrp && tempDstId == tg) {
// Save the grp, src and dest for use in the NXDN Protocol messages
grp = tempGrp;
srcId = tempSrcId;
dstId = tempDstId;
std::string callsign = lookup->find(srcId);
LogMessage("Transmission from %s at NXCore to %s%u", callsign.c_str(), grp ? "TG " : "", dstId);
nxCoreActive = true;
}
}
if ((buffer[0U] & 0xF0U) == 0x90U && buffer[2U] == 0x09U) {
bool tempGrp = (buffer[4U] & 0x20U) == 0x20U;
unsigned short tempSrcId = (buffer[5U] << 8) | buffer[6U];
unsigned short tempDstId = (buffer[7U] << 8) | buffer[8U];
if (tempGrp && tempDstId == tg) {
// Save the grp, src and dest for use in the NXDN Protocol messages
grp = tempGrp;
srcId = tempSrcId;
dstId = tempDstId;
std::string callsign = lookup->find(srcId);
LogMessage("Transmission from %s at NXCore to %s%u", callsign.c_str(), grp ? "TG " : "", dstId);
nxCoreActive = true;
}
}
}
if (nxCoreActive) {
watchdogTimer.start();
for (std::vector<CNXDNRepeater*>::const_iterator it = m_repeaters.begin(); it != m_repeaters.end(); ++it) {
in_addr addr = (*it)->m_address;
unsigned int prt = (*it)->m_port;
nxdnNetwork.write(buffer, len, srcId, dstId, grp, addr, prt);
}
if ((buffer[0U] == 0x81U || buffer[0U] == 0x83U) && buffer[5U] == 0x08U) {
LogMessage("Received end of transmission");
nxCoreActive = false;
watchdogTimer.stop();
}
if ((buffer[0U] & 0xF0U) == 0x90U && buffer[2U] == 0x08U) {
LogMessage("Received end of transmission");
nxCoreActive = false;
watchdogTimer.stop();
}
}
}
}
}
unsigned int ms = stopWatch.elapsed();
stopWatch.start();
// Remove any repeaters that haven't reported for a while
for (std::vector<CNXDNRepeater*>::iterator it = m_repeaters.begin(); it != m_repeaters.end(); ++it)
(*it)->m_timer.clock(ms);
for (std::vector<CNXDNRepeater*>::iterator it = m_repeaters.begin(); it != m_repeaters.end(); ++it) {
CNXDNRepeater* itRpt = *it;
if (itRpt->m_timer.hasExpired()) {
in_addr address = itRpt->m_address;
unsigned int port = itRpt->m_port;
std::string callsign = itRpt->m_callsign;
LogMessage("Removing %s (%s:%u) disappeared", callsign.c_str(), ::inet_ntoa(address), port);
m_repeaters.erase(it);
delete itRpt;
break;
}
}
watchdogTimer.clock(ms);
if (watchdogTimer.isRunning() && watchdogTimer.hasExpired()) {
LogMessage("Network watchdog has expired");
watchdogTimer.stop();
current = NULL;
nxCoreActive = false;
}
dumpTimer.clock(ms);
if (dumpTimer.hasExpired()) {
dumpRepeaters();
dumpTimer.start();
}
if (ms < 5U)
CThread::sleep(5U);
}
nxdnNetwork.close();
closeNXCore();
lookup->stop();
::LogFinalise();
}
CNXDNRepeater* CNXDNReflector::findRepeater(const in_addr& address, unsigned int port) const
{
for (std::vector<CNXDNRepeater*>::const_iterator it = m_repeaters.begin(); it != m_repeaters.end(); ++it) {
if (address.s_addr == (*it)->m_address.s_addr && (*it)->m_port == port)
return *it;
}
return NULL;
}
void CNXDNReflector::dumpRepeaters() const
{
if (m_repeaters.size() == 0U) {
LogMessage("No repeaters linked");
return;
}
LogMessage("Currently linked repeaters:");
for (std::vector<CNXDNRepeater*>::const_iterator it = m_repeaters.begin(); it != m_repeaters.end(); ++it) {
in_addr address = (*it)->m_address;
unsigned int port = (*it)->m_port;
std::string callsign = (*it)->m_callsign;
unsigned int timer = (*it)->m_timer.getTimer();
unsigned int timeout = (*it)->m_timer.getTimeout();
LogMessage(" %s (%s:%u) %u/%u", callsign.c_str(), ::inet_ntoa(address), port, timer, timeout);
}
}
bool CNXDNReflector::openNXCore()
{
m_nxCoreNetwork = new CNXCoreNetwork(m_conf.getNXCoreAddress(), m_conf.getNXCoreDebug());
bool ret = m_nxCoreNetwork->open();
if (!ret) {
delete m_nxCoreNetwork;
m_nxCoreNetwork = NULL;
return false;
}
return true;
}
void CNXDNReflector::closeNXCore()
{
if (m_nxCoreNetwork != NULL) {
m_nxCoreNetwork->close();
delete m_nxCoreNetwork;
m_nxCoreNetwork = NULL;
}
}
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