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/*
* Copyright (C) 2016,2018,2020,2021 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 "YSFReflector.h"
#include "BlockList.h"
#include "StopWatch.h"
#include "Network.h"
#include "Version.h"
#include "Thread.h"
#include "Log.h"
#include "GitVersion.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 = "YSFReflector.ini";
#else
const char* DEFAULT_INI_FILE = "/etc/YSFReflector.ini";
#endif
#include <algorithm>
#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, "YSFReflector version %s git #%.7s\n", VERSION, gitversion);
return 0;
} else if (arg.substr(0, 1) == "-") {
::fprintf(stderr, "Usage: YSFReflector [-v|--version] [filename]\n");
return 1;
} else {
iniFile = argv[currentArg];
}
}
}
CYSFReflector* reflector = new CYSFReflector(std::string(iniFile));
reflector->run();
delete reflector;
return 0;
}
CYSFReflector::CYSFReflector(const std::string& file) :
m_conf(file),
m_repeaters()
{
CUDPSocket::startup();
}
CYSFReflector::~CYSFReflector()
{
CUDPSocket::shutdown();
}
void CYSFReflector::run()
{
bool ret = m_conf.read();
if (!ret) {
::fprintf(stderr, "YSFReflector: 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
#if !defined(_WIN32) && !defined(_WIN64)
ret = ::LogInitialise(m_daemon, m_conf.getLogFilePath(), m_conf.getLogFileRoot(), m_conf.getLogFileLevel(), m_conf.getLogDisplayLevel(), m_conf.getLogFileRotate());
#else
ret = ::LogInitialise(false, m_conf.getLogFilePath(), m_conf.getLogFileRoot(), m_conf.getLogFileLevel(), m_conf.getLogDisplayLevel(), m_conf.getLogFileRotate());
#endif
if (!ret) {
::fprintf(stderr, "YSFReflector: 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.getId(), m_conf.getName(), m_conf.getDescription(), m_conf.getNetworkDebug());
ret = network.open();
if (!ret) {
::LogFinalise();
return;
}
CBlockList blockList(m_conf.getBlockListFile(), m_conf.getBlockListTime());
blockList.start();
network.setCount(0);
CStopWatch stopWatch;
stopWatch.start();
CTimer dumpTimer(1000U, 120U);
dumpTimer.start();
CTimer pollTimer(1000U, 5U);
pollTimer.start();
LogMessage("YSFReflector-%s is starting", VERSION);
LogMessage("Built %s %s (GitID #%.7s)", __TIME__, __DATE__, gitversion);
CTimer watchdogTimer(1000U, 0U, 1500U);
unsigned char tag[YSF_CALLSIGN_LENGTH];
unsigned char src[YSF_CALLSIGN_LENGTH];
unsigned char dst[YSF_CALLSIGN_LENGTH];
bool blocked = false;
for (;;) {
unsigned char buffer[200U];
sockaddr_storage addr;
unsigned int addrLen;
unsigned int len = network.readData(buffer, 200U, addr, addrLen);
if (len > 0U) {
CYSFRepeater* rpt = findRepeater(addr);
if (::memcmp(buffer, "YSFP", 4U) == 0) {
if (rpt == NULL) {
rpt = new CYSFRepeater;
rpt->m_callsign = std::string((char*)(buffer + 4U), 10U);
::memcpy(&rpt->m_addr, &addr, sizeof(struct sockaddr_storage));
rpt->m_addrLen = addrLen;
m_repeaters.push_back(rpt);
network.setCount(m_repeaters.size());
char buff[80U];
LogMessage("Adding %s (%s)", rpt->m_callsign.c_str(), CUDPSocket::display(addr, buff, 80U));
}
rpt->m_timer.start();
network.writePoll(addr, addrLen);
} else if (::memcmp(buffer + 0U, "YSFU", 4U) == 0 && rpt != NULL) {
char buff[80U];
LogMessage("Removing %s (%s) unlinked", rpt->m_callsign.c_str(), CUDPSocket::display(addr, buff, 80U));
for (std::vector<CYSFRepeater*>::iterator it = m_repeaters.begin(); it != m_repeaters.end(); ++it) {
if (CUDPSocket::match((*it)->m_addr, rpt->m_addr)) {
delete *it;
m_repeaters.erase(it);
break;
}
}
network.setCount(m_repeaters.size());
} else if (::memcmp(buffer + 0U, "YSFD", 4U) == 0 && rpt != NULL) {
if (!watchdogTimer.isRunning()) {
::memcpy(tag, buffer + 4U, YSF_CALLSIGN_LENGTH);
if (::memcmp(buffer + 14U, " ", YSF_CALLSIGN_LENGTH) != 0)
::memcpy(src, buffer + 14U, YSF_CALLSIGN_LENGTH);
else
::memcpy(src, "??????????", YSF_CALLSIGN_LENGTH);
if (::memcmp(buffer + 24U, " ", YSF_CALLSIGN_LENGTH) != 0)
::memcpy(dst, buffer + 24U, YSF_CALLSIGN_LENGTH);
else
::memcpy(dst, "??????????", YSF_CALLSIGN_LENGTH);
blocked = blockList.check(src);
if (blocked)
LogMessage("Data from %10.10s at %10.10s blocked", src, tag);
else
LogMessage("Received data from %10.10s to %10.10s at %10.10s", src, dst, tag);
} else {
if (::memcmp(tag, buffer + 4U, YSF_CALLSIGN_LENGTH) == 0) {
bool changed = false;
if (::memcmp(buffer + 14U, " ", YSF_CALLSIGN_LENGTH) != 0 && ::memcmp(src, "??????????", YSF_CALLSIGN_LENGTH) == 0) {
::memcpy(src, buffer + 14U, YSF_CALLSIGN_LENGTH);
changed = true;
}
if (::memcmp(buffer + 24U, " ", YSF_CALLSIGN_LENGTH) != 0 && ::memcmp(dst, "??????????", YSF_CALLSIGN_LENGTH) == 0) {
::memcpy(dst, buffer + 24U, YSF_CALLSIGN_LENGTH);
changed = true;
}
if (changed) {
blocked = blockList.check(src);
if (blocked)
LogMessage("Data from %10.10s at %10.10s blocked", src, tag);
else
LogMessage("Received data from %10.10s to %10.10s at %10.10s", src, dst, tag);
}
}
}
if (!blocked) {
watchdogTimer.start();
for (std::vector<CYSFRepeater*>::const_iterator it = m_repeaters.begin(); it != m_repeaters.end(); ++it) {
if (!CUDPSocket::match((*it)->m_addr, addr))
network.writeData(buffer, (*it)->m_addr, (*it)->m_addrLen);
}
if ((buffer[34U] & 0x01U) == 0x01U) {
LogMessage("Received end of transmission");
watchdogTimer.stop();
}
}
}
}
unsigned int ms = stopWatch.elapsed();
stopWatch.start();
pollTimer.clock(ms);
if (pollTimer.hasExpired()) {
for (std::vector<CYSFRepeater*>::const_iterator it = m_repeaters.begin(); it != m_repeaters.end(); ++it)
network.writePoll((*it)->m_addr, (*it)->m_addrLen);
pollTimer.start();
}
// Remove any repeaters that haven't reported for a while
for (std::vector<CYSFRepeater*>::iterator it = m_repeaters.begin(); it != m_repeaters.end(); ++it)
(*it)->m_timer.clock(ms);
for (std::vector<CYSFRepeater*>::iterator it = m_repeaters.begin(); it != m_repeaters.end(); ++it) {
if ((*it)->m_timer.hasExpired()) {
char buff[80U];
LogMessage("Removing %s (%s) disappeared", (*it)->m_callsign.c_str(),
CUDPSocket::display((*it)->m_addr, buff, 80U));
delete *it;
m_repeaters.erase(it);
network.setCount(m_repeaters.size());
break;
}
}
watchdogTimer.clock(ms);
if (watchdogTimer.isRunning() && watchdogTimer.hasExpired()) {
LogMessage("Network watchdog has expired");
watchdogTimer.stop();
}
dumpTimer.clock(ms);
if (dumpTimer.hasExpired()) {
dumpRepeaters();
dumpTimer.start();
}
blockList.clock(ms);
if (ms < 5U)
CThread::sleep(5U);
}
network.close();
::LogFinalise();
}
CYSFRepeater* CYSFReflector::findRepeater(const sockaddr_storage& addr) const
{
for (std::vector<CYSFRepeater*>::const_iterator it = m_repeaters.begin(); it != m_repeaters.end(); ++it) {
if (CUDPSocket::match(addr, (*it)->m_addr))
return *it;
}
return NULL;
}
void CYSFReflector::dumpRepeaters() const
{
if (m_repeaters.size() == 0U) {
LogMessage("No repeaters/gateways linked");
return;
}
LogMessage("Currently linked repeaters/gateways:");
for (std::vector<CYSFRepeater*>::const_iterator it = m_repeaters.begin(); it != m_repeaters.end(); ++it) {
char buffer[80U];
LogMessage(" %s: %s %u/%u", (*it)->m_callsign.c_str(),
CUDPSocket::display((*it)->m_addr, buffer, 80U),
(*it)->m_timer.getTimer(),
(*it)->m_timer.getTimeout());
}
}