source: source/ariba/utility/bootstrap/modules/periodicbroadcast/PeriodicBroadcast.h @ 4933

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// Copyright (c) 2008-2009, Institute of Telematics, UniversitÀt Karlsruhe (TH)
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// UniversitÀt Karlsruhe (TH)
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// [License]

#ifndef __PERIODIC_BROADCAST_H
#define __PERIODIC_BROADCAST_H

#include "ariba/config.h"

#include <map>
#include <string>
#include <ctime>
#include <iostream>
#include <boost/asio.hpp>
#include <boost/foreach.hpp>
#include <boost/thread/mutex.hpp>
#include <boost/thread/thread.hpp>
#include "ariba/utility/bootstrap/modules/BootstrapModule.h"
#include "ariba/utility/logging/Logging.h"
#include "ariba/utility/system/Timer.h"
#include "PeriodicBroadcastMessage.h"

using std::map;
using std::string;
using std::cout;
using boost::asio::ip::udp;

namespace ariba {
namespace utility {

class PeriodicBroadcast : public BootstrapModule, public Timer {
        use_logging_h(PeriodicBroadcast);
public:
        PeriodicBroadcast(BootstrapInformationCallback* _callback);
        virtual ~PeriodicBroadcast();

        virtual void start();
        virtual void stop();

        virtual string getName();
        virtual string getInformation();
        virtual bool isFunctional();
        virtual void publishService(string name, string info1, string info2, string info3);
        virtual void revokeService(string name);

protected:
        virtual void eventFunction();

private:
        void sendLocalServices();
        void updateRemoteServices();

        static const long timerinterval; // used to send out updates on our services and check for new services
        static const long servicetimeout; // timeout after that a service is dead when we did not receive updates
        static const unsigned int serverport_v4;
        static const unsigned int serverport_v6;

        typedef struct _Service {
                string name;
                string info1;
                string info2;
                string info3;
                time_t lastseen;

                _Service()
                        : name(""), info1(""), info2(""), info3(""), lastseen(0){
                }
        } Service;

        typedef map<string,Service> ServiceList;
        ServiceList localServices;
        boost::mutex localServicesMutex;

        ServiceList remoteServices;
        boost::mutex remoteServicesMutex;

        ServiceList newRemoteServices;
        boost::mutex newRemoteServicesMutex;

        boost::asio::io_service io_service;
        boost::thread* io_service_thread;
        static void threadFunc(PeriodicBroadcast* obj);

        class udp_server {
        private:
                udp::socket socket_v4;
                udp::socket socket_v6;
                udp::endpoint remote_endpoint_;
                boost::array<char, 1500> recv_buffer_;
                ServiceList* services;
                boost::mutex* servicesmutex;

        public:
                udp_server(boost::asio::io_service& io_service, ServiceList* _services, boost::mutex* _servicesmutex)
                        : services(_services), servicesmutex(_servicesmutex),
                                socket_v4(io_service), socket_v6(io_service) {

                        boost::asio::ip::udp::endpoint listen_endpoint_v4(
                                        boost::asio::ip::address_v4::any(),
                                        PeriodicBroadcast::serverport_v4);

                        boost::asio::ip::udp::endpoint listen_endpoint_v6(
                                        boost::asio::ip::address_v6::any(),
                                        PeriodicBroadcast::serverport_v6);

                        boost::system::error_code err;

                        err = socket_v4.open( listen_endpoint_v4.protocol(), err );
                        if(err) logging_warn("failed opening ipv4 socket");

                        err = socket_v6.open( listen_endpoint_v6.protocol(), err );
                        if(err) logging_warn("failed opening ipv6 socket");

                        err = socket_v4.set_option( boost::asio::ip::udp::socket::reuse_address(true), err );
                        if(err) logging_warn("failed setting reuse address option on ipv4 socket");

                        err = socket_v6.set_option( boost::asio::ip::udp::socket::reuse_address(true), err );
                        if(err) logging_warn("failed setting reuse address option on ipv6 socket");

                        err = socket_v4.set_option( boost::asio::socket_base::broadcast(true), err );
                        if(err) logging_warn("failed setting broadcast option on ipv4 socket");

                        err = socket_v6.set_option( boost::asio::socket_base::broadcast(true), err );
                        if(err) logging_warn("failed setting broadcast option on ipv6 socket");

                        err = socket_v4.bind( listen_endpoint_v4, err );
                        if(err) logging_warn("failed binding ipv4 socket");

                        err = socket_v6.bind( listen_endpoint_v6, err );
                        if(err) logging_warn("failed binding ipv6 socket");

                        start_receive();
                }

                void sendservice(Service service){

                        PeriodicBroadcastMessage msg( service.name, service.info1, service.info2, service.info3 );
                        Data data = data_serialize( msg, DEFAULT_V );
                        uint8_t* pnt = data.getBuffer();
                        size_t len = data.getLength() / 8;

                        boost::system::error_code err;

                        {
                                udp::endpoint endp(udp::v4(), PeriodicBroadcast::serverport_v4);
                                endp.address( boost::asio::ip::address_v4::broadcast() );
                                socket_v4.send_to( boost::asio::buffer(pnt, len), endp, 0, err );
                                if(err) logging_warn("failed sending message through ipv4 socket");
                        }
                        {
                                udp::endpoint endp(udp::v6(), PeriodicBroadcast::serverport_v6);
                                endp.address( boost::asio::ip::address_v6::from_string("ff02::1") );
                                socket_v6.send_to( boost::asio::buffer(pnt, len), endp, 0, err );
                                if(err) logging_warn("failed sending message through ipv6 socket");
                        }
                }

        private:
                void start_receive(){
                        socket_v4.async_receive_from(
                                        boost::asio::buffer(recv_buffer_), remote_endpoint_,
                                        boost::bind(&udp_server::handle_receive, this,
                                                        boost::asio::placeholders::error,
                                                        boost::asio::placeholders::bytes_transferred));

                        socket_v6.async_receive_from(
                                        boost::asio::buffer(recv_buffer_), remote_endpoint_,
                                        boost::bind(&udp_server::handle_receive, this,
                                                        boost::asio::placeholders::error,
                                                        boost::asio::placeholders::bytes_transferred));
                }

                void handle_receive(const boost::system::error_code& error,
                                std::size_t bytes_transferred){

                        if (!error || error == boost::asio::error::message_size){

                                PeriodicBroadcastMessage msg;
                                Data data( (uint8_t*)recv_buffer_.data(), bytes_transferred*8 );
                                data_deserialize( msg, data );

                                { // insert new found service
                                        boost::mutex::scoped_lock( *servicesmutex );

                                        ServiceList::iterator it = services->find( msg.getName() );
                                        if( it != services->end() ) services->erase( it );

                                        Service s;
                                        s.info1 = msg.getInfo1();
                                        s.info2 = msg.getInfo2();
                                        s.info3 = msg.getInfo3();
                                        s.lastseen = time(NULL);
                                        services->insert( std::make_pair(msg.getName(), s) );
                                }

                                start_receive();
                        } else {

                                logging_warn("failed receiving message on ipv4 socket" << error);

                        }
                }

                void handle_send(boost::shared_ptr<std::string> /*message*/,
                                const boost::system::error_code& error,
                                std::size_t /*bytes_transferred*/){

                        if(error)
                                logging_warn("failed sending out message");

                }

        };

        udp_server server;

};

}} //namespace ariba, utility

#endif // __BLUETOOTH_SDP_H