flute-receiver.cpp

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#include <cstdio>
#include <iostream>
#include <argp.h>
 
#include <cstdlib>
 
#include <fstream>
#include <string>
#include <filesystem>
#include <libconfig.h++>
#include <boost/asio.hpp>
 
#include "spdlog/async.h"
#include "spdlog/spdlog.h"
#include "spdlog/sinks/syslog_sink.h"
 
#include "Receiver.h"
#include "File.h"
 
 
using libconfig::Config;
using libconfig::FileIOException;
using libconfig::ParseException;
 
using std::placeholders::_1;
using std::placeholders::_2;
using std::placeholders::_3;
 
static void print_version(FILE *stream, struct argp_state *state);
void (*argp_program_version_hook)(FILE *, struct argp_state *) = print_version;
const char *argp_program_bug_address = "Austrian Broadcasting Services <obeca@ors.at>";
static char doc[] = "FLUTE/ALC receiver demo";  // NOLINT
 
static struct argp_option options[] = {  // NOLINT
    {"interface", 'i', "IF", 0, "IP address of the interface to bind flute receivers to (default: 0.0.0.0)", 0},
    {"target", 'm', "IP", 0, "Multicast address to receive on (default: 238.1.1.95)", 0},
    {"port", 'p', "PORT", 0, "Multicast port (default: 40085)", 0},
    {"ipsec-key", 'k', "KEY", 0, "To enable IPSec/ESP decryption of packets, provide a hex-encoded AES key here", 0},
    {"log-level", 'l', "LEVEL", 0,
     "Log verbosity: 0 = trace, 1 = debug, 2 = info, 3 = warn, 4 = error, 5 = "
     "critical, 6 = none. Default: 2.",
     0},
    {nullptr, 0, nullptr, 0, nullptr, 0}};
 
struct ft_arguments {
  const char *flute_interface = {};  
  const char *mcast_target = {};
  bool enable_ipsec = false;
  const char *aes_key = {};
  unsigned short mcast_port = 40085;
  unsigned log_level = 2;        
  char **files;
};
 
static auto parse_opt(int key, char *arg, struct argp_state *state) -> error_t {
  auto arguments = static_cast<struct ft_arguments *>(state->input);
  switch (key) {
    case 'm':
      arguments->mcast_target = arg;
      break;
    case 'i':
      arguments->flute_interface = arg;
      break;
    case 'k':
      arguments->aes_key = arg;
      arguments->enable_ipsec = true;
      break;
    case 'p':
      arguments->mcast_port = static_cast<unsigned short>(strtoul(arg, nullptr, 10));
      break;
    case 'l':
      arguments->log_level = static_cast<unsigned>(strtoul(arg, nullptr, 10));
      break;
    default:
      return ARGP_ERR_UNKNOWN;
  }
  return 0;
}
 
static struct argp argp = {options, parse_opt, nullptr, doc,
                           nullptr, nullptr,   nullptr};
 
void print_version(FILE *stream, struct argp_state * /*state*/) {
  fprintf(stream, "1.0.0\n");
}
 
 
 
auto main(int argc, char **argv) -> int {
  struct ft_arguments arguments;
  /* Default values */
  arguments.mcast_target = "238.1.1.95";
  arguments.flute_interface= "0.0.0.0";
 
  // Parse the arguments
  argp_parse(&argp, argc, argv, 0, nullptr, &arguments);
 
  // Set up logging
  std::string ident = "flute-receiver";
  auto syslog_logger = spdlog::syslog_logger_mt("syslog", ident, LOG_PID | LOG_PERROR | LOG_CONS );
 
  spdlog::set_level(
      static_cast<spdlog::level::level_enum>(arguments.log_level));
  spdlog::set_pattern("[%H:%M:%S.%f %z] [%^%l%$] [thr %t] %v");
 
  spdlog::set_default_logger(syslog_logger);
  spdlog::info("FLUTE receiver demo starting up");
 
  // Create a Boost io_service
  boost::asio::io_service io;
 
  // Create the receiver
  LibFlute::Receiver receiver(
      arguments.flute_interface,
      arguments.mcast_target,
      arguments.mcast_port,
      0,
      io);
 
  // Configure IPSEC, if enabled
  if (arguments.enable_ipsec) 
  {
    receiver.enable_ipsec(1, arguments.aes_key);
  }
 
  receiver.register_completion_callback(
      [](std::shared_ptr<LibFlute::File> file) {
        spdlog::info("{} (TOI {}) has been received",
          file->meta().content_location, file->meta().toi);
        FILE* fd = fopen(file->meta().content_location.c_str(), "wb");
        fwrite(file->buffer(), 1, file->length(), fd);
        fclose(fd);
      });
 
  // Start the IO service
  io.run();
 
exit:
  return 0;
}