142 lines
3.9 KiB
C++
142 lines
3.9 KiB
C++
// This file Copyright © 2017-2022 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 __TRANSMISSION__
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#error only libtransmission should #include this header.
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#endif
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#include <string>
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#include <string_view>
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#include <utility> // for std::make_pair()
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#include "transmission.h"
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#include "error.h"
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#include "net.h"
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#include "tr-assert.h"
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#include "tr-buffer.h"
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struct UTPSocket;
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struct tr_session;
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class tr_peer_socket
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{
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public:
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using Buffer = libtransmission::Buffer;
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tr_peer_socket() = default;
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tr_peer_socket(tr_session const* session, tr_address const& address, tr_port port, tr_socket_t sock);
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tr_peer_socket(tr_address const& address, tr_port port, struct UTPSocket* const sock);
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tr_peer_socket(tr_peer_socket&&) = default;
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tr_peer_socket(tr_peer_socket const&) = delete;
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tr_peer_socket& operator=(tr_peer_socket&&) = default;
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tr_peer_socket& operator=(tr_peer_socket const&) = delete;
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~tr_peer_socket() = default;
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void close(tr_session* session);
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size_t try_write(Buffer& buf, size_t max, tr_error** error) const;
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size_t try_read(Buffer& buf, size_t max, tr_error** error) const;
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[[nodiscard]] constexpr std::pair<tr_address, tr_port> socketAddress() const noexcept
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{
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return std::make_pair(address_, port_);
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}
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[[nodiscard]] constexpr auto const& address() const noexcept
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{
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return address_;
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}
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[[nodiscard]] constexpr auto const& port() const noexcept
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{
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return port_;
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}
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template<typename OutputIt>
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OutputIt display_name(OutputIt out)
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{
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return address_.display_name(out, port_);
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}
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[[nodiscard]] std::string_view display_name(char* out, size_t outlen) const
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{
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return address_.display_name(out, outlen, port_);
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}
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[[nodiscard]] std::string display_name() const
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{
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return address_.display_name(port_);
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}
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[[nodiscard]] constexpr auto is_utp() const noexcept
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{
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return type_ == Type::UTP;
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}
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[[nodiscard]] constexpr auto is_tcp() const noexcept
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{
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return type_ == Type::TCP;
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}
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[[nodiscard]] constexpr auto is_valid() const noexcept
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{
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#ifdef WITH_UTP
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return is_tcp() || is_utp();
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#else
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return is_tcp();
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#endif
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}
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[[nodiscard]] constexpr size_t guess_packet_overhead(size_t n_bytes) const noexcept
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{
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if (is_tcp())
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{
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// https://web.archive.org/web/20140912230020/http://sd.wareonearth.com:80/~phil/net/overhead/
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// TCP over Ethernet:
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// Assuming no header compression (e.g. not PPP)
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// Add 20 IPv4 header or 40 IPv6 header (no options)
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// Add 20 TCP header
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// Add 12 bytes optional TCP timestamps
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// Max TCP Payload data rates over ethernet are thus:
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// (1500-40)/ (38+1500) = 94.9285 % IPv4, minimal headers
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// (1500-52)/ (38+1500) = 94.1482 % IPv4, TCP timestamps
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// (1500-52)/ (42+1500) = 93.9040 % 802.1q, IPv4, TCP timestamps
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// (1500-60)/ (38+1500) = 93.6281 % IPv6, minimal headers
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// (1500-72)/ (38+1500) = 92.8479 % IPv6, TCP timestamps
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// (1500-72)/ (42+1500) = 92.6070 % 802.1q, IPv6, TCP timestamps
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// So, let's guess around 7% overhead
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return n_bytes / 14U;
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}
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// We only guess for TCP; uTP tracks its overhead via UTP_ON_OVERHEAD_STATISTICS
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return {};
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}
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union
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{
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tr_socket_t tcp;
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struct UTPSocket* utp;
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} handle = {};
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private:
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enum class Type
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{
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None,
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TCP,
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UTP
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};
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tr_address address_;
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tr_port port_;
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enum Type type_ = Type::None;
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};
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tr_peer_socket tr_netOpenPeerSocket(tr_session* session, tr_address const& addr, tr_port port, bool client_is_seed);
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