80 lines
1.6 KiB
C++
80 lines
1.6 KiB
C++
// This file Copyright © 2007-2022 Mnemosyne LLC.
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// It may be used under GPLv2 (SPDX: GPL-2.0-only), GPLv3 (SPDX: GPL-3.0-only),
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// or any future license endorsed by Mnemosyne LLC.
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// License text can be found in the licenses/ folder.
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#pragma once
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#ifndef LIBTRANSMISSION_PORT_FORWARDING_MODULE
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#error only the libtransmission port forwarding module should #include this header.
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#endif
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#include <ctime> // time_t
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#include <cstdint>
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#include "transmission.h" // tr_port_forwarding_state
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#include "natpmp.h"
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#include "net.h" // tr_port
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class tr_natpmp
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{
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public:
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tr_natpmp()
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{
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natpmp_.s = static_cast<decltype(natpmp_.s)>(TR_BAD_SOCKET);
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}
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~tr_natpmp()
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{
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closenatpmp(&natpmp_);
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}
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[[nodiscard]] constexpr auto renewTime() const noexcept
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{
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return renew_time_;
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}
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struct PulseResult
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{
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tr_port_forwarding_state state = TR_PORT_ERROR;
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tr_port local_port = {};
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tr_port advertised_port = {};
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};
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PulseResult pulse(tr_port local_port, bool is_enabled);
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private:
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enum class State
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{
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Idle,
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Err,
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Discover,
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RecvPub,
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SendMap,
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RecvMap,
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SendUnmap,
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RecvUnmap
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};
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static constexpr auto LifetimeSecs = uint32_t{ 3600 };
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static constexpr auto CommandWaitSecs = time_t{ 8 };
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[[nodiscard]] bool canSendCommand() const;
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void setCommandTime();
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natpmp_t natpmp_ = {};
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tr_port local_port_ = {};
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tr_port advertised_port_ = {};
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time_t renew_time_ = 0;
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time_t command_time_ = 0;
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State state_ = State::Discover;
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bool has_discovered_ = false;
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bool is_mapped_ = false;
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};
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