mirror of
https://github.com/matrix-construct/construct
synced 2024-10-30 02:18:58 +01:00
136 lines
4 KiB
C++
136 lines
4 KiB
C++
// Matrix Construct
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//
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// Copyright (C) Matrix Construct Developers, Authors & Contributors
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// Copyright (C) 2016-2018 Jason Volk <jason@zemos.net>
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//
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// Permission to use, copy, modify, and/or distribute this software for any
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// purpose with or without fee is hereby granted, provided that the above
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// copyright notice and this permission notice is present in all copies. The
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// full license for this software is available in the LICENSE file.
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//
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// This file is not part of the ircd.h precompiled header because it contains
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// boost::asio assets which we cannot forward declare. It is part of the
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// ircd/asio.h precompiled header.
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//
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namespace ircd::net::dns
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{
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struct tag;
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struct resolver extern *resolver_instance;
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using answers = vector_view<const rfc1035::answer>;
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using answers_callback = std::function<void (std::exception_ptr, const tag &, const answers &)>;
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constexpr const size_t MAX_COUNT {64};
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uint16_t resolver_call(const hostport &, const opts &);
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}
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struct ircd::net::dns::resolver
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{
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using header = rfc1035::header;
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static conf::item<std::string> servers;
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static conf::item<milliseconds> timeout;
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static conf::item<milliseconds> send_rate;
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static conf::item<size_t> send_burst;
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static conf::item<size_t> retry_max;
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answers_callback callback;
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std::vector<ip::udp::endpoint> server; // The list of active servers
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size_t server_next{0}; // Round-robin state to hit servers
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ctx::dock dock, done;
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ctx::mutex mutex;
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std::map<uint16_t, tag> tags; // The active requests
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steady_point send_last; // Time of last send
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std::deque<uint16_t> sendq; // Queue of frames for rate-limiting
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ip::udp::socket ns; // A pollable activity object
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// util
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void add_server(const ipport &);
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void add_server(const string_view &);
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void set_servers(const string_view &list);
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void set_servers();
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// removal (must have lock)
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void unqueue(tag &);
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void remove(tag &);
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decltype(tags)::iterator remove(tag &, const decltype(tags)::iterator &);
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void error_one(tag &, const std::exception_ptr &, const bool &remove = true);
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void error_one(tag &, const std::system_error &, const bool &remove = true);
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void error_all(const std::error_code &, const bool &remove = true);
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void cancel_all(const bool &remove = true);
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// reception
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bool handle_error(const header &, tag &);
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void handle_reply(const header &, const const_buffer &body, tag &);
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void handle_reply(const ipport &, const header &, const const_buffer &body);
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void handle(const ipport &, const mutable_buffer &);
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void recv_worker();
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ctx::context recv_context;
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// submission
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void send_query(const ip::udp::endpoint &, tag &);
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void queue_query(tag &);
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void send_query(tag &);
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void submit(tag &);
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// timeout
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bool check_timeout(const uint16_t &id, tag &, const steady_point &expired);
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void check_timeouts(const milliseconds &timeout);
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void timeout_worker();
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ctx::context timeout_context;
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// sendq
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void flush(const uint16_t &);
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void sendq_work();
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void sendq_clear();
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void sendq_worker();
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ctx::context sendq_context;
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template<class... A> tag &set_tag(A&&...);
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const_buffer make_query(const mutable_buffer &buf, tag &);
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uint16_t operator()(const hostport &, const opts &);
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resolver(answers_callback);
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~resolver() noexcept;
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};
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struct ircd::net::dns::tag
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{
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uint16_t id {0};
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hostport hp;
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dns::opts opts; // note: invalid after query sent
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const_buffer question;
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steady_point last {steady_point::min()};
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uint8_t tries {0};
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uint rcode {0};
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ipport server;
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char hostbuf[rfc1035::NAME_BUFSIZE];
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char servicebuf[256];
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char qbuf[512];
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tag(const hostport &hp, const dns::opts &opts);
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tag(tag &&) = delete;
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tag(const tag &) = delete;
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tag &operator=(tag &&) = delete;
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tag &operator=(const tag &) = delete;
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};
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inline
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ircd::net::dns::tag::tag(const hostport &hp,
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const dns::opts &opts)
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:hp{hp}
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,opts{opts}
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{
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this->hp.host =
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{
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hostbuf, copy(hostbuf, hp.host)
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};
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this->hp.service =
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{
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servicebuf, copy(servicebuf, hp.service)
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};
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}
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