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//
// Copyright 2010-2013 Ettus Research LLC
// Copyright 2018 Ettus Research, a National Instruments Company
//
// SPDX-License-Identifier: GPL-3.0-or-later
//
#include <uhd/utils/thread.hpp>
#include <uhd/utils/safe_main.hpp>
#include <boost/program_options.hpp>
#include <boost/thread/condition_variable.hpp>
#include <boost/thread/thread.hpp>
#include <boost/format.hpp>
#include <boost/asio.hpp>
#include <iostream>
#include <csignal>
#include <vector>
#include <cstdlib>
namespace po = boost::program_options;
namespace asio = boost::asio;
typedef boost::shared_ptr<asio::ip::udp::socket> socket_type;
static const size_t insane_mtu = 9000;
#if defined(UHD_PLATFORM_MACOS)
//limit buffer resize on macos or it will error
const size_t rx_dsp_buff_size = size_t(1e6);
#else
//set to half-a-second of buffering at max rate
const size_t rx_dsp_buff_size = size_t(50e6);
#endif
const size_t tx_dsp_buff_size = (1 << 20);
/***********************************************************************
* Signal handlers
**********************************************************************/
static bool stop_signal_called = false;
void sig_int_handler(int){stop_signal_called = true;}
static bool wait_for_recv_ready(int sock_fd){
//setup timeval for timeout
timeval tv;
tv.tv_sec = 0;
tv.tv_usec = 100000; //100ms
//setup rset for timeout
fd_set rset;
FD_ZERO(&rset);
FD_SET(sock_fd, &rset);
//call select with timeout on receive socket
return ::select(sock_fd+1, &rset, NULL, NULL, &tv) > 0;
}
/***********************************************************************
* Relay class
**********************************************************************/
class udp_relay_type{
public:
udp_relay_type(
const std::string &server_addr,
const std::string &client_addr,
const std::string &port,
const size_t server_rx_size = 0,
const size_t server_tx_size = 0,
const size_t client_rx_size = 0,
const size_t client_tx_size = 0
):_port(port){
{
asio::ip::udp::resolver resolver(_io_service);
asio::ip::udp::resolver::query query(asio::ip::udp::v4(), server_addr, port);
asio::ip::udp::endpoint endpoint = *resolver.resolve(query);
_server_socket = boost::shared_ptr<asio::ip::udp::socket>(new asio::ip::udp::socket(_io_service, endpoint));
resize_buffs(_server_socket, server_rx_size, server_tx_size);
}
{
asio::ip::udp::resolver resolver(_io_service);
asio::ip::udp::resolver::query query(asio::ip::udp::v4(), client_addr, port);
asio::ip::udp::endpoint endpoint = *resolver.resolve(query);
_client_socket = boost::shared_ptr<asio::ip::udp::socket>(new asio::ip::udp::socket(_io_service));
_client_socket->open(asio::ip::udp::v4());
_client_socket->connect(endpoint);
resize_buffs(_client_socket, client_rx_size, client_tx_size);
}
std::cout << "spawning relay threads... " << _port << std::endl;
boost::unique_lock<boost::mutex> lock(spawn_mutex); // lock in preparation to wait for threads to spawn
(void)_thread_group.create_thread(boost::bind(&udp_relay_type::server_thread, this));
wait_for_thread.wait(lock); // wait for thread to spin up
(void)_thread_group.create_thread(boost::bind(&udp_relay_type::client_thread, this));
wait_for_thread.wait(lock); // wait for thread to spin up
std::cout << " done!" << std::endl << std::endl;
}
~udp_relay_type(void){
std::cout << "killing relay threads... " << _port << std::endl;
_thread_group.interrupt_all();
_thread_group.join_all();
std::cout << " done!" << std::endl << std::endl;
}
private:
static void resize_buffs(socket_type sock, const size_t rx_size, const size_t tx_size){
if (rx_size != 0) sock->set_option(asio::socket_base::receive_buffer_size(rx_size));
if (tx_size != 0) sock->set_option(asio::socket_base::send_buffer_size(tx_size));
}
void server_thread(void){
uhd::set_thread_priority_safe();
std::cout << " entering server_thread..." << std::endl;
wait_for_thread.notify_one(); // notify constructor that this thread has started
std::vector<char> buff(insane_mtu);
while (not boost::this_thread::interruption_requested()){
if (wait_for_recv_ready(_server_socket->native_handle())){
boost::mutex::scoped_lock lock(_endpoint_mutex);
const size_t len = _server_socket->receive_from(asio::buffer(&buff.front(), buff.size()), _endpoint);
lock.unlock();
_client_socket->send(asio::buffer(&buff.front(), len));
//perform sequence error detection on tx dsp data (can detect bad network cards)
/*
if (_port[4] == '7'){
static uint32_t next_seq;
const uint32_t this_seq = ntohl(reinterpret_cast<const uint32_t *>(&buff.front())[0]);
if (next_seq != this_seq and this_seq != 0) std::cout << "S" << std::flush;
next_seq = this_seq + 1;
}
*/
}
}
std::cout << " exiting server_thread..." << std::endl;
}
void client_thread(void){
uhd::set_thread_priority_safe();
std::cout << " entering client_thread..." << std::endl;
wait_for_thread.notify_one(); // notify constructor that this thread has started
std::vector<char> buff(insane_mtu);
while (not boost::this_thread::interruption_requested()){
if (wait_for_recv_ready(_client_socket->native_handle())){
const size_t len = _client_socket->receive(asio::buffer(&buff.front(), buff.size()));
boost::mutex::scoped_lock lock(_endpoint_mutex);
_server_socket->send_to(asio::buffer(&buff.front(), len), _endpoint);
}
}
std::cout << " exiting client_thread..." << std::endl;
}
const std::string _port;
boost::thread_group _thread_group;
asio::io_service _io_service;
asio::ip::udp::endpoint _endpoint;
boost::mutex _endpoint_mutex;
socket_type _server_socket, _client_socket;
boost::mutex spawn_mutex;
boost::condition_variable wait_for_thread;
};
/***********************************************************************
* Main
**********************************************************************/
int UHD_SAFE_MAIN(int argc, char *argv[]){
uhd::set_thread_priority_safe();
//variables to be set by po
std::string addr;
std::string bind;
//setup the program options
po::options_description desc("Allowed options");
desc.add_options()
("help", "help message")
("addr", po::value<std::string>(&addr), "the resolvable address of the usrp (must be specified)")
("bind", po::value<std::string>(&bind)->default_value("0.0.0.0"), "bind the server to this network address (default: any)")
;
po::variables_map vm;
po::store(po::parse_command_line(argc, argv, desc), vm);
po::notify(vm);
//print the help message
if (vm.count("help") or not vm.count("addr")){
std::cout
<< boost::format("UHD Network Relay %s") % desc << std::endl
<< "Runs a network relay between UHD on one computer and a USRP on the network.\n"
<< "This example is basically for test purposes. Use at your own convenience.\n"
<< std::endl;
return EXIT_FAILURE;
}
{
boost::shared_ptr<udp_relay_type> ctrl (new udp_relay_type(bind, addr, "49152"));
boost::shared_ptr<udp_relay_type> rxdsp0(new udp_relay_type(bind, addr, "49156", 0, tx_dsp_buff_size, rx_dsp_buff_size, 0));
boost::shared_ptr<udp_relay_type> txdsp0(new udp_relay_type(bind, addr, "49157", tx_dsp_buff_size, 0, 0, tx_dsp_buff_size));
boost::shared_ptr<udp_relay_type> rxdsp1(new udp_relay_type(bind, addr, "49158", 0, tx_dsp_buff_size, rx_dsp_buff_size, 0));
boost::shared_ptr<udp_relay_type> gps (new udp_relay_type(bind, addr, "49172"));
std::signal(SIGINT, &sig_int_handler);
std::cout << "Press Ctrl + C to stop streaming..." << std::endl;
while (not stop_signal_called){
boost::this_thread::sleep(boost::posix_time::milliseconds(100));
}
}
//finished
std::cout << std::endl << "Done!" << std::endl << std::endl;
return EXIT_SUCCESS;
}
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