75 lines
2.4 KiB
C++
75 lines
2.4 KiB
C++
//
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// sap.hpp
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//
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// Copyright (c) 2019 2020 Andrea Bondavalli. All rights reserved.
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program. If not, see <http://www.gnu.org/licenses/>.
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//
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#ifndef _SAP_HPP_
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#define _SAP_HPP_
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#include <boost/asio.hpp>
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#include "log.hpp"
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using namespace boost::asio;
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using boost::asio::deadline_timer;
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class SAP {
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public:
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constexpr static uint16_t port = 9875;
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constexpr static uint16_t max_deletions = 3;
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constexpr static uint16_t bandwidth_limit = 4000; // bits x xsec
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constexpr static uint16_t min_interval = 300; // secs
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constexpr static uint16_t sap_header_len = 24;
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constexpr static uint16_t max_length = 4096;
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SAP() = delete;
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explicit SAP(const std::string& sap_mcast_addr);
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bool set_multicast_interface(const std::string& interface_ip);
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bool announcement(uint16_t msg_id_hash,
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uint32_t addr,
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const std::string& sdp);
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bool deletion(uint16_t msg_id_hash, uint32_t addr, const std::string& sdp);
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bool receive(bool& is_announce,
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uint16_t& msg_id_hash,
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uint32_t& addr,
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std::string& sdp,
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int tout_secs = 1);
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private:
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static void handle_receive(const boost::system::error_code& ec,
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std::size_t length,
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boost::system::error_code* out_ec,
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std::size_t* out_length);
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void check_deadline();
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bool send(bool is_announce,
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uint16_t msg_id_hash,
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uint32_t addr,
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const std::string& sdp);
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std::string addr_;
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io_context io_service_;
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ip::udp::socket socket_{io_service_};
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ip::udp::endpoint remote_endpoint_{
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ip::udp::endpoint(ip::address::from_string(addr_), port)};
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ip::udp::endpoint listen_endpoint_{
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ip::udp::endpoint(ip::address::from_string("0.0.0.0"), port)};
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deadline_timer deadline_{io_service_};
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};
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#endif
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