mirror of
https://github.com/matrix-construct/construct
synced 2024-08-20 16:44:43 +02:00
757 lines
19 KiB
C++
757 lines
19 KiB
C++
// Copyright (C) Matrix Construct Developers, Authors & Contributors
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// Copyright (C) 2016-2018 Jason Volk
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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.
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//
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// THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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// IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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// WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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// DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
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// INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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// (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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// SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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// HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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// STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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// IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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// POSSIBILITY OF SUCH DAMAGE.
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#include <ircd/asio.h>
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namespace ircd
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{
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template<class... args> std::shared_ptr<client> make_client(args&&...);
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}
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/// Linkage for the default settings
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decltype(ircd::client::settings)
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ircd::client::settings
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{};
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/// Linkage for the default conf
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decltype(ircd::client::default_conf)
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ircd::client::default_conf
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{};
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/// The pool of request contexts. When a client makes a request it does so by acquiring
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/// a stack from this pool. The request handling and response logic can then be written
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/// in a synchronous manner as if each connection had its own thread.
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ircd::ctx::pool
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ircd::client::context
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{
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"client", settings.stack_size
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};
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// Linkage for the container of all active clients for iteration purposes.
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template<>
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decltype(ircd::util::instance_list<ircd::client>::list)
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ircd::util::instance_list<ircd::client>::list
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{};
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//
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// init
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//
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ircd::client::init::init()
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{
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context.add(settings.pool_size);
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}
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void
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ircd::client::init::interrupt()
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{
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if(context.active() || !client::list.empty())
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log::warning("Interrupting %zu requests; dropping %zu requests; closing %zu clients...",
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context.active(),
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context.pending(),
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client::list.size());
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context.interrupt();
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close_all_clients();
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}
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ircd::client::init::~init()
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noexcept
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{
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interrupt();
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if(context.active())
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log::warning("Joining %zu active of %zu remaining request contexts...",
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context.active(),
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context.size());
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else
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log::debug("Waiting for %zu request contexts to join...",
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context.size());
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context.join();
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if(unlikely(!client::list.empty()))
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{
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log::error("%zu clients are unterminated...", client::list.size());
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assert(client::list.empty());
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}
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}
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//
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// util
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//
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ircd::http::response::write_closure
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ircd::write_closure(client &client)
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{
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// returns a function that can be called to send an iovector of data to a client
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return [&client](const ilist<const const_buffer> &iov)
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{
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//std::cout << "<<<< " << size(iov) << std::endl;
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//std::cout << iov << std::endl;
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//std::cout << "---- " << std::endl;
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const auto written
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{
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write(*client.sock, iov)
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};
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};
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}
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ircd::parse::read_closure
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ircd::read_closure(client &client)
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{
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// Returns a function the parser can call when it wants more data
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return [&client](char *&start, char *const &stop)
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{
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char *const got(start);
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read(client, start, stop);
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//std::cout << ">>>> " << std::distance(got, start) << std::endl;
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//std::cout << string_view{got, start} << std::endl;
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//std::cout << "----" << std::endl;
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};
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}
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char *
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ircd::read(client &client,
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char *&start,
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char *const &stop)
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{
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assert(client.sock);
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auto &sock(*client.sock);
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const mutable_buffer buf
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{
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start, stop
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};
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char *const base(start);
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start += net::read(sock, buf);
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return base;
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}
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const char *
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ircd::write(client &client,
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const char *&start,
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const char *const &stop)
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{
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assert(client.sock);
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auto &sock(*client.sock);
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const const_buffer buf
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{
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start, stop
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};
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const char *const base(start);
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start += net::write(sock, buf);
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return base;
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}
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std::shared_ptr<ircd::client>
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ircd::add_client(std::shared_ptr<socket> s)
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{
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const auto client
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{
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make_client(std::move(s))
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};
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client->async();
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return client;
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}
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template<class... args>
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std::shared_ptr<ircd::client>
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ircd::make_client(args&&... a)
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{
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return std::make_shared<client>(std::forward<args>(a)...);
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}
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void
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ircd::close_all_clients()
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{
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auto it(begin(client::list));
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while(it != end(client::list))
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{
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auto *const client(*it);
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++it; try
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{
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client->close(net::dc::RST, net::close_ignore);
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}
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catch(const std::exception &e)
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{
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log::warning("Error disconnecting client @%p: %s", client, e.what());
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}
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}
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}
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ircd::ipport
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ircd::local(const client &client)
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{
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if(!client.sock)
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return {};
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return net::local_ipport(*client.sock);
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}
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ircd::ipport
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ircd::remote(const client &client)
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{
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if(!client.sock)
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return {};
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return net::remote_ipport(*client.sock);
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}
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//
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// async loop
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//
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namespace ircd
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{
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static bool handle_ec_default(client &, const error_code &);
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static bool handle_ec_timeout(client &);
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static bool handle_ec_short_read(client &);
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static bool handle_ec_eof(client &);
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static bool handle_ec(client &, const error_code &);
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static void handle_client_request(std::shared_ptr<client>);
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static void handle_client_ready(std::shared_ptr<client>, const error_code &ec);
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}
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/// This function is the basis for the client's request loop. We still use
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/// an asynchronous pattern until there is activity on the socket (a request)
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/// in which case the switch to synchronous mode is made by jumping into an
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/// ircd::context drawn from the request pool. When the request is finished,
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/// the client exits back into asynchronous mode until the next request is
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/// received and rinse and repeat.
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//
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/// This sequence exists to avoid any possible c10k-style limitation imposed by
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/// dedicating a context and its stack space to the lifetime of a connection.
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/// This is similar to the thread-per-request pattern before async was in vogue.
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///
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/// This call returns immediately so we no longer block the current context and
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/// its stack while waiting for activity on idle connections between requests.
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void
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ircd::client::async()
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{
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assert(bool(this->sock));
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assert(bool(this->conf));
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auto &sock(*this->sock);
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const net::wait_opts opts
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{
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net::ready::READ, conf->async_timeout
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};
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auto handler
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{
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std::bind(ircd::handle_client_ready, shared_from(*this), ph::_1)
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};
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sock(opts, std::move(handler));
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}
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/// The client's socket is ready for reading. This intermediate handler
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/// intercepts any errors otherwise dispatches the client to the request
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/// pool to be married with a stack. Right here this handler is executing on
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/// the main stack (not in any ircd::context).
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///
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/// The context the closure ends up getting is the next available from the
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/// request pool, which may not be available immediately so this handler might
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/// be queued for some time after this call returns.
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void
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ircd::handle_client_ready(std::shared_ptr<client> client,
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const error_code &ec)
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{
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if(!handle_ec(*client, ec))
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return;
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auto handler
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{
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std::bind(ircd::handle_client_request, std::move(client))
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};
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client::context(std::move(handler));
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}
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/// A request context has been dispatched and is now handling this client.
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/// This function is executing on that ircd::ctx stack. client::main() will
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/// now be called and synchronous programming is possible. Afterward, the
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/// client will release this ctx and its stack and fall back to async mode
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/// or die.
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void
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ircd::handle_client_request(std::shared_ptr<client> client)
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{
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if(!client->main())
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{
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client->close(net::dc::SSL_NOTIFY).wait();
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return;
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}
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client->async();
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}
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/// This error handling switch is one of two places client errors
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/// are handled. This handles the errors when the client is in async
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/// mode rather than during a request. This executes on the main/callback
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/// stack, not in any ircd::ctx, and must be asynchronous.
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///
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bool
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ircd::handle_ec(client &client,
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const error_code &ec)
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{
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using namespace boost::system::errc;
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using boost::system::system_category;
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using boost::asio::error::get_ssl_category;
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using boost::asio::error::get_misc_category;
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if(ec.category() == system_category()) switch(ec.value())
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{
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case success: return true;
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case operation_canceled: return handle_ec_timeout(client);
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default: return handle_ec_default(client, ec);
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}
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else if(ec.category() == get_misc_category()) switch(ec.value())
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{
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case asio::error::eof: return handle_ec_eof(client);
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default: return handle_ec_default(client, ec);
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}
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else if(ec.category() == get_ssl_category()) switch(uint8_t(ec.value()))
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{
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case SSL_R_SHORT_READ: return handle_ec_short_read(client);
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default: return handle_ec_default(client, ec);
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}
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else return handle_ec_default(client, ec);
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}
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/// The client indicated they will not be sending the data we have been
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/// waiting for. The proper behavior now is to initiate a clean shutdown.
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bool
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ircd::handle_ec_eof(client &client)
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try
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{
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log::debug("socket(%p) local[%s] remote[%s] end of file",
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client.sock.get(),
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string(local(client)),
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string(remote(client)));
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client.close(net::dc::SSL_NOTIFY, net::close_ignore);
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return false;
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}
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catch(const std::exception &e)
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{
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log::error("socket(%p) EOF: %s",
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client.sock.get(),
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e.what());
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return false;
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}
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/// The client terminated the connection, likely improperly, and SSL
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/// is informing us with an opportunity to prevent truncation attacks.
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/// Best behavior here is to just close the sd.
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bool
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ircd::handle_ec_short_read(client &client)
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try
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{
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log::warning("socket(%p) local[%s] remote[%s] short_read",
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client.sock.get(),
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string(local(client)),
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string(remote(client)));
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client.close(net::dc::RST, net::close_ignore);
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return false;
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}
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catch(const std::exception &e)
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{
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log::error("socket(%p) short_read: %s",
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client.sock.get(),
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e.what());
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return false;
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}
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/// The net:: system determined the client timed out because we set a timer
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/// on the socket waiting for data which never arrived. The client may very
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/// well still be there, so the best thing to do is to attempt a clean
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/// disconnect.
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bool
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ircd::handle_ec_timeout(client &client)
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try
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{
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assert(bool(client.sock));
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log::warning("socket(%p) local[%s] remote[%s] disconnecting after inactivity timeout",
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client.sock.get(),
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string(local(client)),
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string(remote(client)));
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client.close(net::dc::SSL_NOTIFY, net::close_ignore);
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return false;
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}
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catch(const std::exception &e)
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{
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log::error("socket(%p) timeout: %s",
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client.sock.get(),
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e.what());
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return false;
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}
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/// Unknown/untreated error. Probably not worth attempting a clean shutdown
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/// so a hard / immediate disconnect given instead.
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bool
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ircd::handle_ec_default(client &client,
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const error_code &ec)
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{
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log::warning("socket(%p) local[%s] remote[%s] %s",
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client.sock.get(),
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string(local(client)),
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string(remote(client)),
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string(ec));
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client.close(net::dc::RST, net::close_ignore);
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return false;
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}
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//
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// client
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//
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ircd::client::client()
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:client{std::shared_ptr<socket>{}}
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{
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}
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ircd::client::client(std::shared_ptr<socket> sock)
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:sock{std::move(sock)}
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{
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}
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ircd::client::~client()
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noexcept try
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{
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//assert(!sock || !connected(*sock));
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}
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catch(const std::exception &e)
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{
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log::critical("socket(%p) ~client(%p): %s",
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sock.get(),
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this,
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e.what());
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return;
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}
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/// Client main loop.
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///
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/// Before main(), the client had been sitting in async mode waiting for
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/// socket activity. Once activity with data was detected indicating a request,
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/// the client was dispatched to the request pool where it is paired to an
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/// ircd::ctx with a stack. main() is then invoked on that ircd::ctx stack.
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/// Nothing from the socket has been read into userspace before main().
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///
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/// This function parses requests off the socket in a loop until there are no
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/// more requests or there is a fatal error. The ctx will "block" to wait for
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/// more data off the socket during the middle of a request until the request
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/// timeout is reached. main() will not "block" to wait for more data after a
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/// request; it will simply `return true` which puts this client back into
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/// async mode and relinquishes this stack. returning false will disconnect
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/// the client rather than putting it back into async mode.
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///
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/// Exceptions do not pass below main() therefor anything unhandled is an
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/// internal server error and the client is disconnected. The exception handler
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/// here though is executing on a request ctx stack, and we can choose to take
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/// advantage of that; in contrast to the handle_ec() switch which handles
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/// errors on the main/callback stack and must be asynchronous.
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///
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bool
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ircd::client::main()
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noexcept try
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{
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char buffer[client::request::HEAD_MAX];
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parse::buffer pb{mutable_buffer{buffer}};
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parse::capstan pc{pb, read_closure(*this)}; do
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{
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if(!handle_request(pc))
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return false;
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// After the request, the head and content has been read off the socket
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// and the capstan has advanced to the end of the content. The catch is
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// that reading off the socket could have read too much, bleeding into
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// the next request. This is rare, but pb.remove() will memmove() the
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// bleed back to the beginning of the head buffer for the next loop.
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pb.remove();
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}
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while(pc.unparsed());
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return true;
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}
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catch(const boost::system::system_error &e)
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{
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using namespace boost::system::errc;
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using boost::system::system_category;
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using boost::asio::error::get_ssl_category;
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using boost::asio::error::get_misc_category;
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log::debug("socket(%p) local[%s] remote[%s] error during request: %s",
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sock.get(),
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string(local(*this)),
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string(remote(*this)),
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string(e.code()));
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const error_code &ec{e.code()};
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const int &value{ec.value()};
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if(ec.category() == system_category()) switch(value)
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{
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case success:
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assert(0);
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return true;
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case broken_pipe:
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case connection_reset:
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case not_connected:
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close(net::dc::RST, net::close_ignore);
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return false;
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case operation_canceled:
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return false;
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case bad_file_descriptor:
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return false;
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default:
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break;
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}
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else if(ec.category() == get_ssl_category()) switch(uint8_t(value))
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{
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case SSL_R_SHORT_READ:
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close(net::dc::RST, net::close_ignore);
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return false;
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case SSL_R_PROTOCOL_IS_SHUTDOWN:
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close(net::dc::RST, net::close_ignore);
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return false;
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default:
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break;
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}
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else if(ec.category() == get_misc_category()) switch(value)
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{
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case boost::asio::error::eof:
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return false;
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default:
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break;
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}
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log::error("socket(%p) (unexpected) %s: (%d) %s",
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sock.get(),
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|
ec.category().name(),
|
|
value,
|
|
ec.message());
|
|
|
|
close(net::dc::RST, net::close_ignore);
|
|
return false;
|
|
}
|
|
catch(const std::exception &e)
|
|
{
|
|
log::error("client[%s] [500 Internal Error]: %s",
|
|
string(remote(*this)),
|
|
e.what());
|
|
|
|
#ifdef RB_DEBUG
|
|
throw;
|
|
#else
|
|
return false;
|
|
#endif
|
|
}
|
|
|
|
/// The constructor for request state is only made in
|
|
/// client::handle_request(). It is defined here to be adjacent to that
|
|
/// callsite
|
|
///
|
|
ircd::client::request::request(parse::capstan &pc)
|
|
:head
|
|
{
|
|
// This is the first read off the wire. The headers are entirely read and
|
|
// the tape is advanced.
|
|
pc
|
|
}
|
|
,content_consumed
|
|
{
|
|
// The size of HTTP headers are never initially known, which means
|
|
// the above head parse could have read too much off the socket bleeding
|
|
// into the content or even the next request entirely. That's ok because
|
|
// the state of `pc` will reflect that back to the main() loop for the
|
|
// next request, but for this request we have to figure out how much of
|
|
// the content was accidentally read so far.
|
|
std::min(pc.unparsed(), head.content_length)
|
|
}
|
|
,content_partial
|
|
{
|
|
pc.parsed, content_consumed
|
|
}
|
|
{
|
|
pc.parsed += content_consumed;
|
|
}
|
|
|
|
/// Handle a single request within the client main() loop.
|
|
///
|
|
/// This function returns false if the main() loop should exit
|
|
/// and thus disconnect the client. It should return true in most
|
|
/// cases even for lightly erroneous requests that won't affect
|
|
/// the next requests on the tape.
|
|
///
|
|
/// This function is timed. The timeout will prevent a client from
|
|
/// sending a partial request and leave us waiting for the rest.
|
|
/// As of right now this timeout extends to our handling of the
|
|
/// request too.
|
|
bool
|
|
ircd::client::handle_request(parse::capstan &pc)
|
|
try
|
|
{
|
|
const socket::scope_timeout timeout
|
|
{
|
|
*sock, conf->request_timeout
|
|
};
|
|
|
|
struct request request{pc};
|
|
assert(pc.parsed <= pc.read);
|
|
this->request = &request;
|
|
log::debug("socket(%p) local[%s] remote[%s] HTTP %s `%s' content-length:%zu part:%zu",
|
|
sock.get(),
|
|
string(local(*this)),
|
|
string(remote(*this)),
|
|
request.head.method,
|
|
request.head.path,
|
|
request.head.content_length,
|
|
request.content_consumed);
|
|
|
|
bool ret
|
|
{
|
|
resource_request(request)
|
|
};
|
|
|
|
if(ret && iequals(request.head.connection, "close"_sv))
|
|
ret = false;
|
|
|
|
return ret;
|
|
}
|
|
catch(const boost::system::system_error &e)
|
|
{
|
|
if(e.code().value() != boost::system::errc::operation_canceled)
|
|
throw;
|
|
|
|
resource::response
|
|
{
|
|
*this, {}, {}, http::REQUEST_TIMEOUT
|
|
};
|
|
|
|
return false;
|
|
}
|
|
catch(const ircd::error &e)
|
|
{
|
|
log::error("socket(%p) local[%s] remote[%s]: %s",
|
|
sock.get(),
|
|
string(local(*this)),
|
|
string(remote(*this)),
|
|
e.what());
|
|
|
|
resource::response
|
|
{
|
|
*this, e.what(), {}, http::INTERNAL_SERVER_ERROR
|
|
};
|
|
|
|
throw;
|
|
}
|
|
|
|
bool
|
|
ircd::client::resource_request(struct request &request)
|
|
try
|
|
{
|
|
auto &resource
|
|
{
|
|
ircd::resource::find(request.head.path)
|
|
};
|
|
|
|
resource(*this, request, request.head);
|
|
return true;
|
|
}
|
|
catch(const http::error &e)
|
|
{
|
|
resource::response
|
|
{
|
|
*this, e.content, "text/html; charset=utf8", e.code, e.headers
|
|
};
|
|
|
|
switch(e.code)
|
|
{
|
|
// These codes are "unrecoverable" errors and no more HTTP can be
|
|
// conducted with this tape. The client must be disconnected.
|
|
case http::BAD_REQUEST:
|
|
case http::REQUEST_TIMEOUT:
|
|
case http::PAYLOAD_TOO_LARGE:
|
|
case http::INTERNAL_SERVER_ERROR:
|
|
return false;
|
|
|
|
// These codes are "recoverable" and allow the next HTTP request in
|
|
// a pipeline to take place.
|
|
default:
|
|
discard_unconsumed(request);
|
|
return true;
|
|
}
|
|
}
|
|
|
|
void
|
|
ircd::client::discard_unconsumed(struct request &request)
|
|
{
|
|
if(unlikely(!sock))
|
|
return;
|
|
|
|
const size_t unconsumed
|
|
{
|
|
request.head.content_length - request.content_consumed
|
|
};
|
|
|
|
if(!unconsumed)
|
|
return;
|
|
|
|
log::debug("socket(%p) local[%s] remote[%s] discarding %zu unconsumed of %zu bytes content...",
|
|
sock.get(),
|
|
string(local(*this)),
|
|
string(remote(*this)),
|
|
unconsumed,
|
|
request.head.content_length);
|
|
|
|
request.content_consumed += net::discard_all(*sock, unconsumed);
|
|
assert(request.content_consumed == request.head.content_length);
|
|
}
|
|
|
|
ircd::ctx::future<void>
|
|
ircd::client::close(const net::close_opts &opts)
|
|
{
|
|
if(likely(sock))
|
|
return net::close(*sock, opts);
|
|
else
|
|
return {};
|
|
}
|
|
|
|
void
|
|
ircd::client::close(const net::close_opts &opts,
|
|
net::close_callback callback)
|
|
{
|
|
net::close(*sock, opts, std::move(callback));
|
|
}
|