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//
// Copyright 2010-2011 Ettus Research LLC
//
// 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 3 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, see <http://www.gnu.org/licenses/>.
//
#include <uhd/utils/thread_priority.hpp>
#include <uhd/utils/safe_main.hpp>
#include <boost/program_options.hpp>
#include <boost/thread/thread.hpp>
#include <boost/format.hpp>
#include <boost/asio.hpp>
#include <iostream>
#include <csignal>
#include <vector>
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;
boost::mutex spawn_mutex;
/***********************************************************************
* 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
):_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));
}
{
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);
}
std::cout << "spawning relay threads..." << std::endl;
_thread_group.create_thread(boost::bind(&udp_relay_type::server_thread, this));
spawn_mutex.lock();
spawn_mutex.lock();
spawn_mutex.unlock();
_thread_group.create_thread(boost::bind(&udp_relay_type::client_thread, this));
spawn_mutex.lock();
spawn_mutex.lock();
spawn_mutex.unlock();
std::cout << " done" << std::endl;
}
~udp_relay_type(void){
std::cout << "killing relay threads..." << std::endl;
_thread_group.interrupt_all();
_thread_group.join_all();
std::cout << " done" << std::endl;
}
private:
void server_thread(void){
std::cout << "entering server_thread... " << _port << std::endl;
spawn_mutex.unlock();
std::vector<char> buff(insane_mtu);
while (not boost::this_thread::interruption_requested()){
if (wait_for_recv_ready(_server_socket->native())){
boost::mutex::scoped_lock lock(_endpoint_mutex);
const size_t len = _server_socket->receive_from(asio::buffer(&buff.front(), buff.size()), _endpoint);
lock.unlock();
//std::cout << " len " << len << std::endl;
_client_socket->send(asio::buffer(&buff.front(), len));
}
}
std::cout << "exiting server_thread... " << _port << std::endl;
}
void client_thread(void){
std::cout << "entering client_thread... " << _port << std::endl;
spawn_mutex.unlock();
std::vector<char> buff(insane_mtu);
while (not boost::this_thread::interruption_requested()){
if (wait_for_recv_ready(_client_socket->native())){
const size_t len = _client_socket->receive(asio::buffer(&buff.front(), buff.size()));
//std::cout << " len " << len << std::endl;
boost::mutex::scoped_lock lock(_endpoint_mutex);
_server_socket->send_to(asio::buffer(&buff.front(), len), _endpoint);
}
}
std::cout << "exiting client_thread... " << _port << 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;
};
/***********************************************************************
* Main
**********************************************************************/
int UHD_SAFE_MAIN(int argc, char *argv[]){
uhd::set_thread_priority_safe();
//variables to be set by po
std::string addr;
//setup the program options
po::options_description desc("Allowed options");
desc.add_options()
("help", "help message")
("addr", po::value<std::string>(&addr)->default_value(""), "the resolvable address of the usrp")
;
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")){
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 ~0;
}
{
boost::shared_ptr<udp_relay_type> ctrl(new udp_relay_type("0.0.0.0", addr, "49152"));
boost::shared_ptr<udp_relay_type> rxdsp0(new udp_relay_type("0.0.0.0", addr, "49156"));
boost::shared_ptr<udp_relay_type> txdsp0(new udp_relay_type("0.0.0.0", addr, "49157"));
boost::shared_ptr<udp_relay_type> rxdsp1(new udp_relay_type("0.0.0.0", addr, "49158"));
boost::shared_ptr<udp_relay_type> gps(new udp_relay_type("0.0.0.0", 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 0;
}
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