mirror of
https://github.com/ShaYmez/MMDVM_CM.git
synced 2024-11-16 05:01:47 -05:00
439 lines
11 KiB
C++
439 lines
11 KiB
C++
/*
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* Copyright (C) 2021 by Doug McLain AD8DP
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include "USRP2M17.h"
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#include <sys/time.h>
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#include <unistd.h>
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#include <signal.h>
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#include <fcntl.h>
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#include <pwd.h>
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#define USRP_FRAME_PER 15U
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#define M17_FRAME_PER 35U
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const char* DEFAULT_INI_FILE = "/etc/USRP2M17.ini";
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const char* HEADER1 = "This software is for use on amateur radio networks only,";
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const char* HEADER2 = "it is to be used for educational purposes only. Its use on";
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const char* HEADER3 = "commercial networks is strictly prohibited.";
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const char* HEADER4 = "Copyright(C) 2021 by AD8DP";
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#define M17CHARACTERS " ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789-/."
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#include <functional>
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#include <algorithm>
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#include <cstdio>
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#include <cstdlib>
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#include <cstring>
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#include <clocale>
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#include <cctype>
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static bool m_killed = false;
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void sig_handler(int signo)
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{
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if (signo == SIGTERM) {
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m_killed = true;
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::fprintf(stdout, "Received SIGTERM\n");
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}
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}
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void encode_callsign(uint8_t *callsign)
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{
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const std::string m17_alphabet(M17CHARACTERS);
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char cs[10];
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memset(cs, 0, sizeof(cs));
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memcpy(cs, callsign, strlen((char *)callsign));
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uint64_t encoded = 0;
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for(int i = std::strlen((char *)callsign)-1; i >= 0; i--) {
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auto pos = m17_alphabet.find(cs[i]);
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if (pos == std::string::npos) {
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pos = 0;
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}
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encoded *= 40;
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encoded += pos;
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}
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for (int i=0; i<6; i++) {
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callsign[i] = (encoded >> (8*(5-i)) & 0xFFU);
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}
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}
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void decode_callsign(uint8_t *callsign)
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{
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const std::string m17_alphabet(M17CHARACTERS);
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uint8_t code[6];
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uint64_t coded = callsign[0];
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for (int i=1; i<6; i++)
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coded = (coded << 8) | callsign[i];
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if (coded > 0xee6b27ffffffu) {
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//std::cerr << "Callsign code is too large, 0x" << std::hex << coded << std::endl;
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return;
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}
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memcpy(code, callsign, 6);
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memset(callsign, 0, 10);
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int i = 0;
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while (coded) {
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callsign[i++] = m17_alphabet[coded % 40];
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coded /= 40;
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}
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}
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int main(int argc, char** argv)
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{
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const char* iniFile = DEFAULT_INI_FILE;
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if (argc > 1) {
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for (int currentArg = 1; currentArg < argc; ++currentArg) {
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std::string arg = argv[currentArg];
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if ((arg == "-v") || (arg == "--version")) {
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::fprintf(stdout, "USRP2M17 version %s\n", VERSION);
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return 0;
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} else if (arg.substr(0, 1) == "-") {
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::fprintf(stderr, "Usage: USRP2M17 [-v|--version] [filename]\n");
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return 1;
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} else {
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iniFile = argv[currentArg];
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}
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}
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}
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// Capture SIGTERM to finish gracelessly
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if (signal(SIGTERM, sig_handler) == SIG_ERR)
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::fprintf(stdout, "Can't catch SIGTERM\n");
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CUSRP2M17* gateway = new CUSRP2M17(std::string(iniFile));
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int ret = gateway->run();
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delete gateway;
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return ret;
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}
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CUSRP2M17::CUSRP2M17(const std::string& configFile) :
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m_callsign(),
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m_m17Ref(),
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m_conf(configFile),
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m_usrpNetwork(NULL),
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m_m17Network(NULL),
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m_conv(),
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m_m17Src(),
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m_m17Dst(),
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m_m17Frame(NULL),
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m_m17Frames(0U),
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m_usrpFrame(NULL),
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m_usrpFrames(0U)
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{
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m_m17Frame = new uint8_t[100U];
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m_usrpFrame = new uint8_t[400U];
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::memset(m_m17Frame, 0U, 100U);
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::memset(m_usrpFrame, 0U, 400U);
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}
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CUSRP2M17::~CUSRP2M17()
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{
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delete[] m_m17Frame;
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delete[] m_usrpFrame;
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}
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int CUSRP2M17::run()
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{
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bool ret = m_conf.read();
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if (!ret) {
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::fprintf(stderr, "USRP2M17: cannot read the .ini file\n");
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return 1;
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}
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//setlocale(LC_ALL, "C");
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uint32_t logDisplayLevel = m_conf.getLogDisplayLevel();
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if(m_conf.getDaemon())
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logDisplayLevel = 0U;
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bool m_daemon = m_conf.getDaemon();
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if (m_daemon) {
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// Create new process
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pid_t pid = ::fork();
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if (pid == -1) {
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::fprintf(stderr, "Couldn't fork() , exiting\n");
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return -1;
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} else if (pid != 0)
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exit(EXIT_SUCCESS);
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// Create new session and process group
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if (::setsid() == -1) {
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::fprintf(stderr, "Couldn't setsid(), exiting\n");
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return -1;
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}
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// Set the working directory to the root directory
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if (::chdir("/") == -1) {
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::fprintf(stderr, "Couldn't cd /, exiting\n");
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return -1;
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}
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// If we are currently root...
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if (getuid() == 0) {
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struct passwd* user = ::getpwnam("mmdvm");
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if (user == NULL) {
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::fprintf(stderr, "Could not get the mmdvm user, exiting\n");
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return -1;
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}
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uid_t mmdvm_uid = user->pw_uid;
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gid_t mmdvm_gid = user->pw_gid;
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// Set user and group ID's to mmdvm:mmdvm
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if (setgid(mmdvm_gid) != 0) {
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::fprintf(stderr, "Could not set mmdvm GID, exiting\n");
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return -1;
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}
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if (setuid(mmdvm_uid) != 0) {
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::fprintf(stderr, "Could not set mmdvm UID, exiting\n");
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return -1;
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}
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// Double check it worked (AKA Paranoia)
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if (setuid(0) != -1) {
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::fprintf(stderr, "It's possible to regain root - something is wrong!, exiting\n");
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return -1;
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}
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}
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}
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ret = ::LogInitialise(m_conf.getLogFilePath(), m_conf.getLogFileRoot(), m_conf.getLogFileLevel(), logDisplayLevel);
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if (!ret) {
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::fprintf(stderr, "USRP2M17: unable to open the log file\n");
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return 1;
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}
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if (m_daemon) {
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::close(STDIN_FILENO);
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::close(STDOUT_FILENO);
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::close(STDERR_FILENO);
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}
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LogInfo(HEADER1);
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LogInfo(HEADER2);
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LogInfo(HEADER3);
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LogInfo(HEADER4);
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m_callsign = m_conf.getCallsign();
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m_m17Ref = m_conf.getM17Name();
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char module = m_m17Ref.c_str()[m_m17Ref.find(' ')+1];
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std::string m17_address = m_conf.getM17Address();
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uint16_t m17_dstPort = m_conf.getM17DstPort();
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uint16_t m17_localPort = m_conf.getM17LocalPort();
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bool m17_debug = m_conf.getM17Debug();
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m_conv.setM17GainAdjDb(m_conf.getM17GainAdjDb());
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uint16_t streamid = 0;
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uint8_t m17_src[10];
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uint8_t m17_dst[10];
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memcpy(m17_src, m_callsign.c_str(), 9);
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m17_src[9] = 0x00;
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encode_callsign(m17_src);
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m_m17Network = new CM17Network(m17_address, m17_dstPort, m17_localPort, m17_src, m17_debug);
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ret = m_m17Network->open();
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if (!ret) {
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::LogError("Cannot open the M17 network port");
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::LogFinalise();
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return 1;
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}
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std::string usrp_address = m_conf.getUSRPAddress();
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uint16_t usrp_dstPort = m_conf.getUSRPDstPort();
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uint16_t usrp_localPort = m_conf.getUSRPLocalPort();
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bool usrp_debug = m_conf.getUSRPDebug();
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m_conv.setUSRPGainAdjDb(m_conf.getUSRPGainAdjDb());
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m_usrpNetwork = new CUSRPNetwork(usrp_address, usrp_dstPort, usrp_localPort, usrp_debug);
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ret = m_usrpNetwork->open();
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if (!ret) {
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::LogError("Cannot open the USRP network port");
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::LogFinalise();
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return 1;
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}
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CTimer networkWatchdog(100U, 0U, 1500U);
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CTimer pollTimer(1000U, 8U);
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CStopWatch stopWatch;
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CStopWatch m17Watch;
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CStopWatch usrpWatch;
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pollTimer.start();
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stopWatch.start();
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m17Watch.start();
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usrpWatch.start();
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uint16_t m17_cnt = 0;
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uint32_t usrp_cnt = 0;
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m_m17Network->writeLink(module);
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LogMessage("Starting USRP2M17-%s", VERSION);
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for (; m_killed == 0;) {
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uint8_t buffer[2000U];
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memset(buffer, 0, sizeof(buffer));
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uint32_t ms = stopWatch.elapsed();
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if (m17Watch.elapsed() > M17_FRAME_PER) {
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uint32_t m17FrameType = m_conv.getM17(m_m17Frame);
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if(m17FrameType == TAG_HEADER) {
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m17_cnt = 0U;
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m17Watch.start();
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streamid = static_cast<uint16_t>((::rand() & 0xFFFF));
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memcpy(m17_dst, m_m17Ref.c_str(), m_m17Ref.size());
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m17_dst[9] = 0x00;
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encode_callsign(m17_dst);
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memcpy(buffer, "M17 ", 4);
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memcpy(buffer+4, &streamid, 2);
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memcpy(buffer+6, m17_dst, 6);
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memcpy(buffer+12, m17_src, 6);
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buffer[19] = 0x05;
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memcpy(buffer+36, m_m17Frame, 16);
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m_m17Network->writeData(buffer, 54U);
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}
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else if(m17FrameType == TAG_EOT) {
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m17_cnt |= 0x8000;
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memcpy(buffer, "M17 ", 4);
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memcpy(buffer+4, &streamid, 2);
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memcpy(buffer+6, m17_dst, 6);
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memcpy(buffer+12, m17_src, 6);
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buffer[19] = 0x05;
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buffer[34] = m17_cnt >> 8;
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buffer[35] = m17_cnt & 0xff;
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memcpy(buffer+36, m_m17Frame, 16);
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m_m17Network->writeData(buffer, 54U);
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m17Watch.start();
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}
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else if(m17FrameType == TAG_DATA) {
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//CUtils::dump(1U, "M17 Data", m_p25Frame, 11U);
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m17_cnt++;
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memcpy(buffer, "M17 ", 4);
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memcpy(buffer+4, &streamid, 2);
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memcpy(buffer+6, m17_dst, 6);
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memcpy(buffer+12, m17_src, 6);
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buffer[19] = 0x05;
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buffer[34] = m17_cnt >> 8;
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buffer[35] = m17_cnt & 0xff;
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memcpy(buffer+36, m_m17Frame, 16);
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m_m17Network->writeData(buffer, 54U);
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m17Watch.start();
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}
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}
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while (m_m17Network->readData(m_m17Frame, 54U) > 0U) {
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//CUtils::dump(1U, "M17 Data", m_p25Frame, 22U);
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if (!memcmp(m_m17Frame, "M17 ", 4)) {
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if (m_m17Frame[34] == 0 && m_m17Frame[35] == 0) {
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m_m17Frames = 0;
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}
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else if (m_m17Frame[34U] & 0x80U) {
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LogMessage("M17 received end of voice transmission, %.1f seconds", float(m_m17Frames) / 25.0F);
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}
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else{
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m_conv.putM17(m_m17Frame);
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}
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uint8_t cs[10];
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memcpy(cs, m_m17Frame+12, 6);
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decode_callsign(cs);
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std::string css((char *)cs);
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css = css.substr(0, css.find(' '));
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m_m17Frames++;
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}
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}
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if (usrpWatch.elapsed() > USRP_FRAME_PER) {
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int16_t pcm[160];
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if(m_conv.getUSRP(pcm)){
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//CUtils::dump(1U, "USRP data:", m_usrpFrame, 33U);
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const uint32_t cnt = htonl(usrp_cnt);
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memcpy(m_usrpFrame, "USRP", 4);
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memset(m_usrpFrame+4, 0, 28);
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memcpy(m_usrpFrame+4, &cnt, 4);
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m_usrpFrame[15] = 1;
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for(int i = 0; i < 320; i+=2){
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m_usrpFrame[32+i] = pcm[(i/2)] & 0xff;
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m_usrpFrame[32+i+1] = pcm[(i/2)] >> 8;
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}
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m_usrpNetwork->writeData(m_usrpFrame, 352);
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usrp_cnt++;
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usrpWatch.start();
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}
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}
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uint32_t len = 0;
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while ( (len = m_usrpNetwork->readData(m_usrpFrame, 400)) ) {
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if((len == 32) && !memcmp(m_usrpFrame, "USRP", 4)) {
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LogMessage("USRP received end of voice transmission, %.1f seconds", float(m_usrpFrames) / 50.0F);
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m_conv.putUSRPEOT();
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m_usrpFrames = 0U;
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}
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if( (!memcmp(m_usrpFrame, "USRP", 4)) && len == 352) {
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if(!m_usrpFrames){
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m_conv.putUSRPHeader();
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LogMessage("USRP first frame received");
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}
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int16_t pcm[160];
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for(int i = 0; i < 160; ++i){
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pcm[i] = (m_usrpFrame[32+(i*2)+1] << 8) | m_usrpFrame[32+(i*2)];
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}
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m_conv.putUSRP(pcm);
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m_usrpFrames++;
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}
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}
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stopWatch.start();
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pollTimer.clock(ms);
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if (pollTimer.isRunning() && pollTimer.hasExpired()) {
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m_m17Network->writePoll();
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pollTimer.start();
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}
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if (ms < 5U) ::usleep(5U * 1000U);
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}
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m_m17Network->close();
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m_usrpNetwork->close();
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delete m_usrpNetwork;
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delete m_m17Network;
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::LogFinalise();
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return 0;
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}
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