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MMDVM_CM/USRP2M17/USRP2M17.cpp

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/*
* Copyright (C) 2021 by Doug McLain AD8DP
*
* 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 "USRP2M17.h"
#include <sys/time.h>
#include <unistd.h>
#include <signal.h>
#include <fcntl.h>
#include <pwd.h>
#define USRP_FRAME_PER 15U
#define M17_FRAME_PER 35U
const char* DEFAULT_INI_FILE = "/etc/USRP2M17.ini";
const char* HEADER1 = "This software is for use on amateur radio networks only,";
const char* HEADER2 = "it is to be used for educational purposes only. Its use on";
const char* HEADER3 = "commercial networks is strictly prohibited.";
const char* HEADER4 = "Copyright(C) 2021 by AD8DP";
#define M17CHARACTERS " ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789-/."
#include <functional>
#include <algorithm>
#include <cstdio>
#include <cstdlib>
#include <cstring>
#include <clocale>
#include <cctype>
static bool m_killed = false;
void sig_handler(int signo)
{
if (signo == SIGTERM) {
m_killed = true;
::fprintf(stdout, "Received SIGTERM\n");
}
}
void encode_callsign(uint8_t *callsign)
{
const std::string m17_alphabet(M17CHARACTERS);
char cs[10];
memset(cs, 0, sizeof(cs));
memcpy(cs, callsign, strlen((char *)callsign));
uint64_t encoded = 0;
for(int i = std::strlen((char *)callsign)-1; i >= 0; i--) {
auto pos = m17_alphabet.find(cs[i]);
if (pos == std::string::npos) {
pos = 0;
}
encoded *= 40;
encoded += pos;
}
for (int i=0; i<6; i++) {
callsign[i] = (encoded >> (8*(5-i)) & 0xFFU);
}
}
void decode_callsign(uint8_t *callsign)
{
const std::string m17_alphabet(M17CHARACTERS);
uint8_t code[6];
uint64_t coded = callsign[0];
for (int i=1; i<6; i++)
coded = (coded << 8) | callsign[i];
if (coded > 0xee6b27ffffffu) {
//std::cerr << "Callsign code is too large, 0x" << std::hex << coded << std::endl;
return;
}
memcpy(code, callsign, 6);
memset(callsign, 0, 10);
int i = 0;
while (coded) {
callsign[i++] = m17_alphabet[coded % 40];
coded /= 40;
}
}
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, "USRP2M17 version %s\n", VERSION);
return 0;
} else if (arg.substr(0, 1) == "-") {
::fprintf(stderr, "Usage: USRP2M17 [-v|--version] [filename]\n");
return 1;
} else {
iniFile = argv[currentArg];
}
}
}
// Capture SIGTERM to finish gracelessly
if (signal(SIGTERM, sig_handler) == SIG_ERR)
::fprintf(stdout, "Can't catch SIGTERM\n");
CUSRP2M17* gateway = new CUSRP2M17(std::string(iniFile));
int ret = gateway->run();
delete gateway;
return ret;
}
CUSRP2M17::CUSRP2M17(const std::string& configFile) :
m_callsign(),
m_m17Ref(),
m_usrpcs(),
m_conf(configFile),
m_usrpNetwork(NULL),
m_m17Network(NULL),
m_conv(),
m_m17Src(),
m_m17Dst(),
m_m17Frame(NULL),
m_m17Frames(0U),
m_usrpFrame(NULL),
m_usrpFrames(0U)
{
m_m17Frame = new uint8_t[100U];
m_usrpFrame = new uint8_t[400U];
::memset(m_m17Frame, 0U, 100U);
::memset(m_usrpFrame, 0U, 400U);
}
CUSRP2M17::~CUSRP2M17()
{
delete[] m_m17Frame;
delete[] m_usrpFrame;
}
int CUSRP2M17::run()
{
bool ret = m_conf.read();
if (!ret) {
::fprintf(stderr, "USRP2M17: cannot read the .ini file\n");
return 1;
}
//setlocale(LC_ALL, "C");
uint32_t logDisplayLevel = m_conf.getLogDisplayLevel();
if(m_conf.getDaemon())
logDisplayLevel = 0U;
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 -1;
} else if (pid != 0)
exit(EXIT_SUCCESS);
// Create new session and process group
if (::setsid() == -1) {
::fprintf(stderr, "Couldn't setsid(), exiting\n");
return -1;
}
// Set the working directory to the root directory
if (::chdir("/") == -1) {
::fprintf(stderr, "Couldn't cd /, exiting\n");
return -1;
}
// 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 -1;
}
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 -1;
}
if (setuid(mmdvm_uid) != 0) {
::fprintf(stderr, "Could not set mmdvm UID, exiting\n");
return -1;
}
// Double check it worked (AKA Paranoia)
if (setuid(0) != -1) {
::fprintf(stderr, "It's possible to regain root - something is wrong!, exiting\n");
return -1;
}
}
}
ret = ::LogInitialise(m_conf.getLogFilePath(), m_conf.getLogFileRoot(), m_conf.getLogFileLevel(), logDisplayLevel);
if (!ret) {
::fprintf(stderr, "USRP2M17: unable to open the log file\n");
return 1;
}
if (m_daemon) {
::close(STDIN_FILENO);
::close(STDOUT_FILENO);
::close(STDERR_FILENO);
}
LogInfo(HEADER1);
LogInfo(HEADER2);
LogInfo(HEADER3);
LogInfo(HEADER4);
m_callsign = m_conf.getCallsign();
m_m17Ref = m_conf.getM17Name();
char module = m_m17Ref.c_str()[m_m17Ref.find(' ')+1];
std::string m17_address = m_conf.getM17Address();
uint16_t m17_dstPort = m_conf.getM17DstPort();
uint16_t m17_localPort = m_conf.getM17LocalPort();
bool m17_debug = m_conf.getM17Debug();
m_conv.setM17GainAdjDb(m_conf.getM17GainAdjDb());
uint16_t streamid = 0;
uint8_t m17_src[10];
uint8_t m17_dst[10];
memcpy(m17_src, m_callsign.c_str(), 9);
m17_src[9] = 0x00;
encode_callsign(m17_src);
m_m17Network = new CM17Network(m17_address, m17_dstPort, m17_localPort, m17_src, m17_debug);
ret = m_m17Network->open();
if (!ret) {
::LogError("Cannot open the M17 network port");
::LogFinalise();
return 1;
}
std::string usrp_address = m_conf.getUSRPAddress();
uint16_t usrp_dstPort = m_conf.getUSRPDstPort();
uint16_t usrp_localPort = m_conf.getUSRPLocalPort();
bool usrp_debug = m_conf.getUSRPDebug();
m_conv.setUSRPGainAdjDb(m_conf.getUSRPGainAdjDb());
m_usrpNetwork = new CUSRPNetwork(usrp_address, usrp_dstPort, usrp_localPort, usrp_debug);
ret = m_usrpNetwork->open();
if (!ret) {
::LogError("Cannot open the USRP network port");
::LogFinalise();
return 1;
}
CTimer networkWatchdog(100U, 0U, 1500U);
CTimer pollTimer(1000U, 8U);
CStopWatch stopWatch;
CStopWatch m17Watch;
CStopWatch usrpWatch;
pollTimer.start();
stopWatch.start();
m17Watch.start();
usrpWatch.start();
uint16_t m17_cnt = 0;
uint32_t usrp_cnt = 0;
m_m17Network->writeLink(module);
LogMessage("Starting USRP2M17-%s", VERSION);
for (; m_killed == 0;) {
uint8_t buffer[2000U];
memset(buffer, 0, sizeof(buffer));
uint32_t ms = stopWatch.elapsed();
if (m17Watch.elapsed() > M17_FRAME_PER) {
uint32_t m17FrameType = m_conv.getM17(m_m17Frame);
if( (m_usrpcs.size()) > 3 && (m_usrpcs.size() < 8) ){
memset(m17_src, ' ', 9);
memcpy(m17_src, m_usrpcs.c_str(), m_usrpcs.size());
m17_src[8] = 'D';
m17_src[9] = 0x00;
encode_callsign(m17_src);
}
else{
memcpy(m17_src, m_callsign.c_str(), 9);
m17_src[9] = 0x00;
encode_callsign(m17_src);
}
if(m17FrameType == TAG_HEADER) {
m17_cnt = 0U;
m17Watch.start();
streamid = static_cast<uint16_t>((::rand() & 0xFFFF));
memcpy(m17_dst, m_m17Ref.c_str(), m_m17Ref.size());
m17_dst[9] = 0x00;
encode_callsign(m17_dst);
memcpy(buffer, "M17 ", 4);
memcpy(buffer+4, &streamid, 2);
memcpy(buffer+6, m17_dst, 6);
memcpy(buffer+12, m17_src, 6);
buffer[19] = 0x05;
memcpy(buffer+36, m_m17Frame, 16);
m_m17Network->writeData(buffer, 54U);
}
else if(m17FrameType == TAG_EOT) {
m17_cnt |= 0x8000;
memcpy(buffer, "M17 ", 4);
memcpy(buffer+4, &streamid, 2);
memcpy(buffer+6, m17_dst, 6);
memcpy(buffer+12, m17_src, 6);
buffer[19] = 0x05;
buffer[34] = m17_cnt >> 8;
buffer[35] = m17_cnt & 0xff;
memcpy(buffer+36, m_m17Frame, 16);
m_m17Network->writeData(buffer, 54U);
m17Watch.start();
}
else if(m17FrameType == TAG_DATA) {
//CUtils::dump(1U, "M17 Data", m_p25Frame, 11U);
m17_cnt++;
memcpy(buffer, "M17 ", 4);
memcpy(buffer+4, &streamid, 2);
memcpy(buffer+6, m17_dst, 6);
memcpy(buffer+12, m17_src, 6);
buffer[19] = 0x05;
buffer[34] = m17_cnt >> 8;
buffer[35] = m17_cnt & 0xff;
memcpy(buffer+36, m_m17Frame, 16);
m_m17Network->writeData(buffer, 54U);
m17Watch.start();
}
}
while (m_m17Network->readData(m_m17Frame, 54U) > 0U) {
//CUtils::dump(1U, "M17 Data", m_p25Frame, 22U);
if (!memcmp(m_m17Frame, "M17 ", 4)) {
if (m_m17Frame[34] == 0 && m_m17Frame[35] == 0) {
m_m17Frames = 0;
m_conv.putM17Header();
}
else if (m_m17Frame[34U] & 0x80U) {
m_conv.putM17EOT();
LogMessage("M17 received end of voice transmission, %.1f seconds", float(m_m17Frames) / 25.0F);
}
else{
m_conv.putM17(m_m17Frame);
}
uint8_t cs[10];
memcpy(cs, m_m17Frame+12, 6);
decode_callsign(cs);
std::string css((char *)cs);
m_usrpcs = css.substr(0, css.find(' '));
m_m17Frames++;
}
}
if (usrpWatch.elapsed() > USRP_FRAME_PER) {
int16_t pcm[160];
uint32_t usrpFrameType = m_conv.getUSRP(pcm);
if(usrpFrameType == TAG_USRP_HEADER){
//CUtils::dump(1U, "USRP data:", m_usrpFrame, 33U);
const uint32_t cnt = htonl(usrp_cnt);
memset(m_usrpFrame, 0, 352);
memcpy(m_usrpFrame, "USRP", 4);
memcpy(m_usrpFrame+4, &cnt, 4);
m_usrpFrame[15] = USRP_KEYUP_FALSE;
m_usrpFrame[20] = USRP_TYPE_TEXT;
m_usrpFrame[32] = TLV_TAG_SET_INFO;
m_usrpFrame[33] = 13 + m_usrpcs.size();
memcpy(m_usrpFrame+46, m_usrpcs.c_str(), m_usrpcs.size());
m_usrpNetwork->writeData(m_usrpFrame, 352);
usrp_cnt++;
usrpWatch.start();
}
if(usrpFrameType == TAG_USRP_EOT){
//CUtils::dump(1U, "USRP data:", m_usrpFrame, 33U);
const uint32_t cnt = htonl(usrp_cnt);
memcpy(m_usrpFrame, "USRP", 4);
memset(m_usrpFrame+4, 0, 28);
memcpy(m_usrpFrame+4, &cnt, 4);
m_usrpFrame[15] = USRP_KEYUP_FALSE;
m_usrpNetwork->writeData(m_usrpFrame, 32);
usrp_cnt++;
usrpWatch.start();
}
if(usrpFrameType == TAG_USRP_DATA){
//CUtils::dump(1U, "USRP data:", m_usrpFrame, 33U);
const uint32_t cnt = htonl(usrp_cnt);
memcpy(m_usrpFrame, "USRP", 4);
memset(m_usrpFrame+4, 0, 28);
memcpy(m_usrpFrame+4, &cnt, 4);
m_usrpFrame[15] = USRP_KEYUP_TRUE;
for(int i = 0; i < 320; i+=2){
m_usrpFrame[32+i] = pcm[(i/2)] & 0xff;
m_usrpFrame[32+i+1] = pcm[(i/2)] >> 8;
}
m_usrpNetwork->writeData(m_usrpFrame, 352);
usrp_cnt++;
usrpWatch.start();
}
}
uint32_t len = 0;
while ( (len = m_usrpNetwork->readData(m_usrpFrame, 400)) ) {
if(!memcmp(m_usrpFrame, "USRP", 4) && (len == 32)) {
LogMessage("USRP received end of voice transmission, %.1f seconds", float(m_usrpFrames) / 50.0F);
m_conv.putUSRPEOT();
m_usrpcs.clear();
m_usrpFrames = 0U;
}
if( (!memcmp(m_usrpFrame, "USRP", 4)) && len == 352) {
if( (m_usrpFrame[20] == USRP_TYPE_TEXT) && (m_usrpFrame[32] == TLV_TAG_SET_INFO) ){
m_usrpcs = (char *)(m_usrpFrame + 46);
if(!m_usrpFrames){
m_conv.putUSRPHeader();
LogMessage("USRP text info received as first frame");
}
m_usrpFrames++;
}
else if( (m_usrpFrame[20] == USRP_TYPE_VOICE) && (m_usrpFrame[15] == USRP_KEYUP_TRUE) ){
if(!m_usrpFrames){
m_usrpcs.clear();
m_conv.putUSRPHeader();
LogMessage("USRP voice received as first frame");
}
int16_t pcm[160];
for(int i = 0; i < 160; ++i){
pcm[i] = (m_usrpFrame[32+(i*2)+1] << 8) | m_usrpFrame[32+(i*2)];
}
m_conv.putUSRP(pcm);
m_usrpFrames++;
}
}
}
stopWatch.start();
pollTimer.clock(ms);
if (pollTimer.isRunning() && pollTimer.hasExpired()) {
m_m17Network->writePoll();
pollTimer.start();
}
if (ms < 5U) ::usleep(5U * 1000U);
}
m_m17Network->close();
m_usrpNetwork->close();
delete m_usrpNetwork;
delete m_m17Network;
::LogFinalise();
return 0;
}
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