source: source/ariba/utility/bootstrap/modules/periodicbroadcast/PeriodicBroadcast.h@ 10706

// [License]
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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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// Germany
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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"

//link-local
#include "ariba/utility/transport/tcpip/tcpip.hpp"

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

namespace ariba {
namespace utility {

class PeriodicBroadcast : public BootstrapModule, public Timer {
        use_logging_h(PeriodicBroadcast);
public:
        PeriodicBroadcast(BootstrapInformationCallback* _callback, string info);
        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;

        class Service {
        private:
                string name;
                string info1;
                string info2;
                string info3;
                time_t lastseen;

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

                Service(const string& _name, const string& _info1,
                                const string& _info2, const string& _info3, const time_t& _lastseen = 0){
                        name.assign (_name);
                        info1.assign(_info1);
                        info2.assign(_info2);
                        info3.assign(_info3);
                        lastseen = _lastseen;
                }

                Service(const Service& rh){
                        name.assign (rh.name);
                        info1.assign(rh.info1);
                        info2.assign(rh.info2);
                        info3.assign(rh.info3);
                        lastseen = rh.lastseen;
                }

                string getName() const {
                        return name;
                }

                string getInfo1() const {
                        return info1;
                }

                string getInfo2() const {
                        return info2;
                }

                string getInfo3() const {
                        return info3;
                }

                time_t getLastseen() const {
                        return lastseen;
                }

                void setName(string _name){
                        name.assign(_name);
                }

                void setInfo1(string _info1){
                        info1.assign(_info1);
                }

                void setInfo2(string _info2){
                        info2.assign(_info2);
                }

                void setInfo3(string _info3){
                        info3.assign(_info3);
                }

                void setLastseen(time_t _lastseen){
                        lastseen = _lastseen;
                }

                Service& operator=(const Service& rh){
                        this->name.assign( rh.getName() );
                        this->info1.assign( rh.getInfo1() );
                        this->info2.assign( rh.getInfo2() );
                        this->info3.assign( rh.getInfo3() );
                        this->lastseen = rh.lastseen;
                        return *this;
                }
        };

        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_4;
                boost::array<char, 1500> recv_buffer_6;
                ServiceList* services;
                boost::mutex* servicesmutex;

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

                        if( open4() ) start_receive_4();
                        if( open6() ) start_receive_6();
                }

                bool open4(){
                        boost::system::error_code err;

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

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

                        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");
                                return false;
                        }

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

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

                        return true;
                }

                bool open6(){
                        boost::system::error_code err;

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

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

                        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");
                                return false;
                        }

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

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

                        return true;
                }

                void sendservice(Service service){

                        PeriodicBroadcastMessage msg;
                        if(service.getName().empty()) return;

                        msg.setName( service.getName() );
                        msg.setInfo1( service.getInfo1() );
                        msg.setInfo2( service.getInfo2() );
                        msg.setInfo3( service.getInfo3() );

                        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);
                                boost::asio::ip::address_v6 all_nodes = boost::asio::ip::address_v6::from_string("ff02::1");
                                
                                // include all link-local interfaces
                                vector<uint64_t> scope_ids = ariba::transport::tcpip::get_interface_scope_ids();
                                
                                BOOST_FOREACH ( uint64_t id, scope_ids )
                                {
                    all_nodes.scope_id(id);
                    endp.address( all_nodes );
                    
                    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_4(){
                        socket_v4.async_receive_from(
                                        boost::asio::buffer(recv_buffer_4), remote_endpoint_,
                                        boost::bind(&udp_server::handle_receive_4, this,
                                                        boost::asio::placeholders::error,
                                                        boost::asio::placeholders::bytes_transferred));
                }

                void start_receive_6(){
                        socket_v6.async_receive_from(
                                        boost::asio::buffer(recv_buffer_6), remote_endpoint_,
                                        boost::bind(&udp_server::handle_receive_6, this,
                                                        boost::asio::placeholders::error,
                                                        boost::asio::placeholders::bytes_transferred));
                }

                void handle_receive_4(const boost::system::error_code& error,
                                std::size_t bytes_transferred){

                        if (!error || error == boost::asio::error::message_size)
                                handle_info(recv_buffer_4, bytes_transferred);
                        else
                                logging_warn("failed receiving broadcast data: " << error.message());

                        start_receive_4();
                }

                void handle_receive_6(const boost::system::error_code& error,
                                std::size_t bytes_transferred){

                        if (!error || error == boost::asio::error::message_size)
                                handle_info(recv_buffer_6, bytes_transferred);
                        else
                                logging_warn("failed receiving broadcast data: " << error.message());

                        start_receive_6();
                }

                void handle_info(boost::array<char, 1500>& buffer, std::size_t length){

                        try {

                                PeriodicBroadcastMessage msg;

                                Data data( (uint8_t*)buffer.data(), length*8 );
                                data_deserialize( msg, data );

                                { // insert new found service
                                        boost::mutex::scoped_lock lock( *servicesmutex );
                                        if(msg.getName().empty()) return;

                                        ServiceList::iterator it = services->find( msg.getName() );
                                        if( it != services->end() ){
                                                it->second.setLastseen( time(NULL) );
                                        } else {
                                                Service s( msg.getName(), msg.getInfo1(), msg.getInfo2(), msg.getInfo3(), time(NULL));
                                                services->insert( std::make_pair(msg.getName(), s) );
                                        }
                                }

                        }catch(...){
                                /* ignore 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