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P25Clients/P25Gateway/P25Gateway.cpp
Jonathan Naylor 45ad634e69 Reinstate the remote command handler.
2020-10-27 11:34:08 +00:00

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/*
* Copyright (C) 2016-2020 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 "P25Gateway.h"
#include "Reflectors.h"
#include "StopWatch.h"
#include "DMRLookup.h"
#include "Network.h"
#include "Version.h"
#include "Thread.h"
#include "Voice.h"
#include "Timer.h"
#include "Utils.h"
#include "Log.h"
#if defined(_WIN32) || defined(_WIN64)
#include <WS2tcpip.h>
#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
const unsigned P25_VOICE_ID = 10999U;
#include <cstdio>
#include <cstdlib>
#include <cstdarg>
#include <ctime>
#include <cstring>
class CStaticTG {
public:
unsigned int m_tg;
sockaddr_storage m_addr;
unsigned int m_addrLen;
};
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)
{
CUDPSocket::startup();
}
CP25Gateway::~CP25Gateway()
{
CUDPSocket::shutdown();
}
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) {
::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());
#else
ret = ::LogInitialise(false, m_conf.getLogFilePath(), m_conf.getLogFileRoot(), m_conf.getLogFileLevel(), m_conf.getLogDisplayLevel());
#endif
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
sockaddr_storage rptAddr;
unsigned int rptAddrLen;
if (CUDPSocket::lookup(m_conf.getRptAddress(), m_conf.getRptPort(), rptAddr, rptAddrLen) != 0) {
LogError("Unable to resolve the address of the host");
return;
}
CNetwork localNetwork(m_conf.getMyPort(), m_conf.getCallsign(), m_conf.getDebug());
ret = localNetwork.open();
if (!ret) {
::LogFinalise();
return;
}
CNetwork remoteNetwork(m_conf.getNetworkPort(), m_conf.getCallsign(), m_conf.getNetworkDebug());
ret = remoteNetwork.open();
if (!ret) {
localNetwork.close();
::LogFinalise();
return;
}
CUDPSocket* remoteSocket = NULL;
if (m_conf.getRemoteCommandsEnabled()) {
remoteSocket = new CUDPSocket(m_conf.getRemoteCommandsPort());
ret = remoteSocket->open();
if (!ret) {
delete remoteSocket;
remoteSocket = NULL;
}
}
CReflectors reflectors(m_conf.getNetworkHosts1(), m_conf.getNetworkHosts2(), m_conf.getNetworkReloadTime());
if (m_conf.getNetworkParrotPort() > 0U)
reflectors.setParrot(m_conf.getNetworkParrotAddress(), m_conf.getNetworkParrotPort());
if (m_conf.getNetworkP252DMRPort() > 0U)
reflectors.setP252DMR(m_conf.getNetworkP252DMRAddress(), m_conf.getNetworkP252DMRPort());
reflectors.load();
CDMRLookup* lookup = new CDMRLookup(m_conf.getLookupName(), m_conf.getLookupTime());
lookup->read();
unsigned int rfHangTime = m_conf.getNetworkRFHangTime();
unsigned int netHangTime = m_conf.getNetworkNetHangTime();
CTimer hangTimer(1000U);
CTimer pollTimer(1000U, 5U);
pollTimer.start();
CStopWatch stopWatch;
stopWatch.start();
CVoice* voice = NULL;
if (m_conf.getVoiceEnabled()) {
voice = new CVoice(m_conf.getVoiceDirectory(), m_conf.getVoiceLanguage(), P25_VOICE_ID);
bool ok = voice->open();
if (!ok) {
delete voice;
voice = NULL;
}
}
LogMessage("Starting P25Gateway-%s", VERSION);
unsigned int srcId = 0U;
unsigned int dstTG = 0U;
bool currentIsStatic = false;
unsigned int currentTG = 0U;
unsigned int currentAddrLen = 0U;
sockaddr_storage currentAddr;
std::vector<unsigned int> staticIds = m_conf.getNetworkStatic();
std::vector<CStaticTG> staticTGs;
for (std::vector<unsigned int>::const_iterator it = staticIds.cbegin(); it != staticIds.cend(); ++it) {
CP25Reflector* reflector = reflectors.find(*it);
if (reflector != NULL) {
CStaticTG staticTG;
staticTG.m_tg = *it;
staticTG.m_addr = reflector->m_addr;
staticTG.m_addrLen = reflector->m_addrLen;
staticTGs.push_back(staticTG);
remoteNetwork.writePoll(staticTG.m_addr, staticTG.m_addrLen);
remoteNetwork.writePoll(staticTG.m_addr, staticTG.m_addrLen);
remoteNetwork.writePoll(staticTG.m_addr, staticTG.m_addrLen);
LogMessage("Statically linked to reflector %u", *it);
}
}
for (;;) {
unsigned char buffer[200U];
sockaddr_storage addr;
unsigned int addrLen;
// From the reflector to the MMDVM
unsigned int len = remoteNetwork.readData(buffer, 200U, addr, addrLen);
if (len > 0U) {
// If we're linked and it's from the right place, send it on
if (currentAddrLen > 0U && CUDPSocket::match(currentAddr, addr)) {
// 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] = (currentTG >> 16) & 0xFFU;
buffer[2U] = (currentTG >> 8) & 0xFFU;
buffer[3U] = (currentTG >> 0) & 0xFFU;
}
localNetwork.writeData(buffer, len, rptAddr, rptAddrLen);
hangTimer.start();
}
} else if (currentTG == 0U) {
// Don't pass reflector control data through to the MMDVM
if (buffer[0U] != 0xF0U && buffer[0U] != 0xF1U) {
// Find the static TG that this audio data belongs to
for (std::vector<CStaticTG>::const_iterator it = staticTGs.cbegin(); it != staticTGs.cend(); ++it) {
if (CUDPSocket::match(addr, (*it).m_addr)) {
currentTG = (*it).m_tg;
break;
}
}
if (currentTG > 0U) {
currentAddr = addr;
currentAddrLen = addrLen;
currentIsStatic = true;
// 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] = (currentTG >> 16) & 0xFFU;
buffer[2U] = (currentTG >> 8) & 0xFFU;
buffer[3U] = (currentTG >> 0) & 0xFFU;
}
localNetwork.writeData(buffer, len, rptAddr, rptAddrLen);
LogMessage("Switched to reflector %u due to network activity", currentTG);
hangTimer.setTimeout(netHangTime);
hangTimer.start();
}
}
}
}
// From the MMDVM to the reflector or control data
len = localNetwork.readData(buffer, 200U, addr, addrLen);
if (len > 0U) {
if (buffer[0U] == 0x65U) {
dstTG = (buffer[1U] << 16) & 0xFF0000U;
dstTG |= (buffer[2U] << 8) & 0x00FF00U;
dstTG |= (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 (dstTG != currentTG) {
if (currentAddrLen > 0U) {
std::string callsign = lookup->find(srcId);
LogMessage("Unlinking from reflector %u by %s", currentTG, callsign.c_str());
if (!currentIsStatic) {
remoteNetwork.writeUnlink(currentAddr, currentAddrLen);
remoteNetwork.writeUnlink(currentAddr, currentAddrLen);
remoteNetwork.writeUnlink(currentAddr, currentAddrLen);
}
hangTimer.stop();
}
const CStaticTG* found = NULL;
for (std::vector<CStaticTG>::const_iterator it = staticTGs.cbegin(); it != staticTGs.cend(); ++it) {
if (dstTG == (*it).m_tg) {
found = &(*it);
break;
}
}
if (found == NULL) {
CP25Reflector* refl = reflectors.find(dstTG);
if (refl != NULL) {
currentTG = dstTG;
currentAddr = refl->m_addr;
currentAddrLen = refl->m_addrLen;
currentIsStatic = false;
} else {
currentTG = dstTG;
currentAddrLen = 0U;
currentIsStatic = false;
}
} else {
currentTG = found->m_tg;
currentAddr = found->m_addr;
currentAddrLen = found->m_addrLen;
currentIsStatic = true;
}
// Link to the new reflector
if (currentAddrLen > 0U) {
std::string callsign = lookup->find(srcId);
LogMessage("Switched to reflector %u due to RF activity from %s", currentTG, callsign.c_str());
if (!currentIsStatic) {
remoteNetwork.writePoll(currentAddr, currentAddrLen);
remoteNetwork.writePoll(currentAddr, currentAddrLen);
remoteNetwork.writePoll(currentAddr, currentAddrLen);
}
hangTimer.setTimeout(rfHangTime);
hangTimer.start();
} else {
hangTimer.stop();
}
if (voice != NULL) {
if (currentAddrLen == 0U)
voice->unlinked();
else
voice->linkedTo(dstTG);
}
}
}
if (buffer[0U] == 0x80U) {
if (voice != NULL)
voice->eof();
}
// If we're linked and we have a network, send it on
if (currentAddrLen > 0U) {
// 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] = (currentTG >> 16) & 0xFFU;
buffer[2U] = (currentTG >> 8) & 0xFFU;
buffer[3U] = (currentTG >> 0) & 0xFFU;
}
remoteNetwork.writeData(buffer, len, currentAddr, currentAddrLen);
hangTimer.start();
}
}
if (voice != NULL) {
unsigned int length = voice->read(buffer);
if (length > 0U)
localNetwork.writeData(buffer, length, rptAddr, rptAddrLen);
}
if (remoteSocket != NULL) {
sockaddr_storage addr;
unsigned int addrLen;
int res = remoteSocket->read(buffer, 200U, addr, addrLen);
if (res > 0) {
buffer[res] = '\0';
if (::memcmp(buffer + 0U, "TalkGroup", 9U) == 0) {
unsigned int tg = (unsigned int)::atoi((char*)(buffer + 9U));
if (tg != currentTG) {
if (currentAddrLen > 0U) {
LogMessage("Unlinked from reflector %u by remote command", currentTG);
if (!currentIsStatic) {
remoteNetwork.writeUnlink(currentAddr, currentAddrLen);
remoteNetwork.writeUnlink(currentAddr, currentAddrLen);
remoteNetwork.writeUnlink(currentAddr, currentAddrLen);
}
hangTimer.stop();
}
const CStaticTG* found = NULL;
for (std::vector<CStaticTG>::const_iterator it = staticTGs.cbegin(); it != staticTGs.cend(); ++it) {
if (tg == (*it).m_tg) {
found = &(*it);
break;
}
}
if (found == NULL) {
CP25Reflector* refl = reflectors.find(tg);
if (refl != NULL) {
currentTG = tg;
currentAddr = refl->m_addr;
currentAddrLen = refl->m_addrLen;
currentIsStatic = false;
} else {
currentTG = tg;
currentAddrLen = 0U;
currentIsStatic = false;
}
} else {
currentTG = found->m_tg;
currentAddr = found->m_addr;
currentAddrLen = found->m_addrLen;
currentIsStatic = true;
}
// Link to the new reflector
if (currentAddrLen > 0U) {
LogMessage("Switched to reflector %u by remote command", currentTG);
if (!currentIsStatic) {
remoteNetwork.writePoll(currentAddr, currentAddrLen);
remoteNetwork.writePoll(currentAddr, currentAddrLen);
remoteNetwork.writePoll(currentAddr, currentAddrLen);
}
hangTimer.setTimeout(rfHangTime);
hangTimer.start();
} else {
hangTimer.stop();
}
if (voice != NULL) {
if (currentAddrLen == 0U)
voice->unlinked();
else
voice->linkedTo(currentTG);
}
}
} else {
CUtils::dump("Invalid remote command received", buffer, res);
}
}
}
unsigned int ms = stopWatch.elapsed();
stopWatch.start();
reflectors.clock(ms);
if (voice != NULL)
voice->clock(ms);
hangTimer.clock(ms);
if (hangTimer.isRunning() && hangTimer.hasExpired()) {
currentTG = 0U;
if (currentAddrLen > 0U) {
LogMessage("Unlinking from %u due to inactivity", currentTG);
if (!currentIsStatic) {
remoteNetwork.writeUnlink(currentAddr, currentAddrLen);
remoteNetwork.writeUnlink(currentAddr, currentAddrLen);
remoteNetwork.writeUnlink(currentAddr, currentAddrLen);
}
if (voice != NULL)
voice->unlinked();
currentAddrLen = 0U;
hangTimer.stop();
}
}
pollTimer.clock(ms);
if (pollTimer.isRunning() && pollTimer.hasExpired()) {
// Poll the static TGs
for (std::vector<CStaticTG>::const_iterator it = staticTGs.cbegin(); it != staticTGs.cend(); ++it)
remoteNetwork.writePoll((*it).m_addr, (*it).m_addrLen);
// Poll the dynamic TG
if (!currentIsStatic && currentAddrLen > 0U)
remoteNetwork.writePoll(currentAddr, currentAddrLen);
pollTimer.start();
}
if (ms < 5U)
CThread::sleep(5U);
}
delete voice;
localNetwork.close();
if (remoteSocket != NULL) {
remoteSocket->close();
delete remoteSocket;
}
remoteNetwork.close();
lookup->stop();
::LogFinalise();
}
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